2950 lines
67 KiB
C
2950 lines
67 KiB
C
/*
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* comedi/comedi_fops.c
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* comedi kernel module
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*
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* COMEDI - Linux Control and Measurement Device Interface
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* Copyright (C) 1997-2000 David A. Schleef <ds@schleef.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include "comedi_compat32.h"
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/sched/signal.h>
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#include <linux/fcntl.h>
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#include <linux/delay.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/poll.h>
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#include <linux/device.h>
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#include <linux/fs.h>
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#include "comedidev.h"
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#include <linux/cdev.h>
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#include <linux/io.h>
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#include <linux/uaccess.h>
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#include "comedi_internal.h"
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/*
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* comedi_subdevice "runflags"
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* COMEDI_SRF_RT: DEPRECATED: command is running real-time
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* COMEDI_SRF_ERROR: indicates an COMEDI_CB_ERROR event has occurred
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* since the last command was started
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* COMEDI_SRF_RUNNING: command is running
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* COMEDI_SRF_FREE_SPRIV: free s->private on detach
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*
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* COMEDI_SRF_BUSY_MASK: runflags that indicate the subdevice is "busy"
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*/
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#define COMEDI_SRF_RT BIT(1)
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#define COMEDI_SRF_ERROR BIT(2)
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#define COMEDI_SRF_RUNNING BIT(27)
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#define COMEDI_SRF_FREE_SPRIV BIT(31)
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#define COMEDI_SRF_BUSY_MASK (COMEDI_SRF_ERROR | COMEDI_SRF_RUNNING)
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/**
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* struct comedi_file - Per-file private data for COMEDI device
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* @dev: COMEDI device.
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* @read_subdev: Current "read" subdevice.
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* @write_subdev: Current "write" subdevice.
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* @last_detach_count: Last known detach count.
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* @last_attached: Last known attached/detached state.
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*/
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struct comedi_file {
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struct comedi_device *dev;
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struct comedi_subdevice *read_subdev;
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struct comedi_subdevice *write_subdev;
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unsigned int last_detach_count;
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bool last_attached:1;
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};
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#define COMEDI_NUM_MINORS 0x100
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#define COMEDI_NUM_SUBDEVICE_MINORS \
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(COMEDI_NUM_MINORS - COMEDI_NUM_BOARD_MINORS)
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static unsigned short comedi_num_legacy_minors;
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module_param(comedi_num_legacy_minors, ushort, 0444);
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MODULE_PARM_DESC(comedi_num_legacy_minors,
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"number of comedi minor devices to reserve for non-auto-configured devices (default 0)"
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);
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unsigned int comedi_default_buf_size_kb = CONFIG_COMEDI_DEFAULT_BUF_SIZE_KB;
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module_param(comedi_default_buf_size_kb, uint, 0644);
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MODULE_PARM_DESC(comedi_default_buf_size_kb,
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"default asynchronous buffer size in KiB (default "
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__MODULE_STRING(CONFIG_COMEDI_DEFAULT_BUF_SIZE_KB) ")");
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unsigned int comedi_default_buf_maxsize_kb
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= CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB;
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module_param(comedi_default_buf_maxsize_kb, uint, 0644);
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MODULE_PARM_DESC(comedi_default_buf_maxsize_kb,
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"default maximum size of asynchronous buffer in KiB (default "
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__MODULE_STRING(CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB) ")");
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static DEFINE_MUTEX(comedi_board_minor_table_lock);
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static struct comedi_device
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*comedi_board_minor_table[COMEDI_NUM_BOARD_MINORS];
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static DEFINE_MUTEX(comedi_subdevice_minor_table_lock);
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/* Note: indexed by minor - COMEDI_NUM_BOARD_MINORS. */
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static struct comedi_subdevice
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*comedi_subdevice_minor_table[COMEDI_NUM_SUBDEVICE_MINORS];
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static struct class *comedi_class;
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static struct cdev comedi_cdev;
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static void comedi_device_init(struct comedi_device *dev)
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{
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kref_init(&dev->refcount);
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spin_lock_init(&dev->spinlock);
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mutex_init(&dev->mutex);
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init_rwsem(&dev->attach_lock);
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dev->minor = -1;
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}
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static void comedi_dev_kref_release(struct kref *kref)
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{
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struct comedi_device *dev =
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container_of(kref, struct comedi_device, refcount);
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mutex_destroy(&dev->mutex);
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put_device(dev->class_dev);
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kfree(dev);
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}
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/**
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* comedi_dev_put() - Release a use of a COMEDI device
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* @dev: COMEDI device.
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*
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* Must be called when a user of a COMEDI device is finished with it.
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* When the last user of the COMEDI device calls this function, the
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* COMEDI device is destroyed.
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*
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* Return: 1 if the COMEDI device is destroyed by this call or @dev is
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* NULL, otherwise return 0. Callers must not assume the COMEDI
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* device is still valid if this function returns 0.
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*/
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int comedi_dev_put(struct comedi_device *dev)
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{
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if (dev)
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return kref_put(&dev->refcount, comedi_dev_kref_release);
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return 1;
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}
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EXPORT_SYMBOL_GPL(comedi_dev_put);
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static struct comedi_device *comedi_dev_get(struct comedi_device *dev)
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{
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if (dev)
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kref_get(&dev->refcount);
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return dev;
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}
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static void comedi_device_cleanup(struct comedi_device *dev)
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{
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struct module *driver_module = NULL;
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if (!dev)
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return;
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mutex_lock(&dev->mutex);
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if (dev->attached)
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driver_module = dev->driver->module;
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comedi_device_detach(dev);
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if (driver_module && dev->use_count)
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module_put(driver_module);
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mutex_unlock(&dev->mutex);
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}
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static bool comedi_clear_board_dev(struct comedi_device *dev)
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{
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unsigned int i = dev->minor;
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bool cleared = false;
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mutex_lock(&comedi_board_minor_table_lock);
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if (dev == comedi_board_minor_table[i]) {
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comedi_board_minor_table[i] = NULL;
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cleared = true;
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}
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mutex_unlock(&comedi_board_minor_table_lock);
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return cleared;
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}
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static struct comedi_device *comedi_clear_board_minor(unsigned int minor)
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{
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struct comedi_device *dev;
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mutex_lock(&comedi_board_minor_table_lock);
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dev = comedi_board_minor_table[minor];
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comedi_board_minor_table[minor] = NULL;
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mutex_unlock(&comedi_board_minor_table_lock);
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return dev;
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}
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static void comedi_free_board_dev(struct comedi_device *dev)
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{
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if (dev) {
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comedi_device_cleanup(dev);
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if (dev->class_dev) {
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device_destroy(comedi_class,
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MKDEV(COMEDI_MAJOR, dev->minor));
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}
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comedi_dev_put(dev);
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}
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}
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static struct comedi_subdevice *
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comedi_subdevice_from_minor(const struct comedi_device *dev, unsigned int minor)
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{
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struct comedi_subdevice *s;
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unsigned int i = minor - COMEDI_NUM_BOARD_MINORS;
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mutex_lock(&comedi_subdevice_minor_table_lock);
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s = comedi_subdevice_minor_table[i];
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if (s && s->device != dev)
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s = NULL;
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mutex_unlock(&comedi_subdevice_minor_table_lock);
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return s;
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}
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static struct comedi_device *comedi_dev_get_from_board_minor(unsigned int minor)
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{
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struct comedi_device *dev;
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mutex_lock(&comedi_board_minor_table_lock);
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dev = comedi_dev_get(comedi_board_minor_table[minor]);
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mutex_unlock(&comedi_board_minor_table_lock);
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return dev;
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}
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static struct comedi_device *
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comedi_dev_get_from_subdevice_minor(unsigned int minor)
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{
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struct comedi_device *dev;
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struct comedi_subdevice *s;
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unsigned int i = minor - COMEDI_NUM_BOARD_MINORS;
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mutex_lock(&comedi_subdevice_minor_table_lock);
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s = comedi_subdevice_minor_table[i];
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dev = comedi_dev_get(s ? s->device : NULL);
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mutex_unlock(&comedi_subdevice_minor_table_lock);
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return dev;
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}
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/**
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* comedi_dev_get_from_minor() - Get COMEDI device by minor device number
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* @minor: Minor device number.
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*
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* Finds the COMEDI device associated with the minor device number, if any,
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* and increments its reference count. The COMEDI device is prevented from
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* being freed until a matching call is made to comedi_dev_put().
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*
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* Return: A pointer to the COMEDI device if it exists, with its usage
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* reference incremented. Return NULL if no COMEDI device exists with the
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* specified minor device number.
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*/
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struct comedi_device *comedi_dev_get_from_minor(unsigned int minor)
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{
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if (minor < COMEDI_NUM_BOARD_MINORS)
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return comedi_dev_get_from_board_minor(minor);
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return comedi_dev_get_from_subdevice_minor(minor);
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}
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EXPORT_SYMBOL_GPL(comedi_dev_get_from_minor);
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static struct comedi_subdevice *
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comedi_read_subdevice(const struct comedi_device *dev, unsigned int minor)
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{
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struct comedi_subdevice *s;
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if (minor >= COMEDI_NUM_BOARD_MINORS) {
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s = comedi_subdevice_from_minor(dev, minor);
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if (!s || (s->subdev_flags & SDF_CMD_READ))
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return s;
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}
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return dev->read_subdev;
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}
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static struct comedi_subdevice *
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comedi_write_subdevice(const struct comedi_device *dev, unsigned int minor)
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{
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struct comedi_subdevice *s;
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if (minor >= COMEDI_NUM_BOARD_MINORS) {
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s = comedi_subdevice_from_minor(dev, minor);
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if (!s || (s->subdev_flags & SDF_CMD_WRITE))
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return s;
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}
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return dev->write_subdev;
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}
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static void comedi_file_reset(struct file *file)
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{
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struct comedi_file *cfp = file->private_data;
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struct comedi_device *dev = cfp->dev;
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struct comedi_subdevice *s, *read_s, *write_s;
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unsigned int minor = iminor(file_inode(file));
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read_s = dev->read_subdev;
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write_s = dev->write_subdev;
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if (minor >= COMEDI_NUM_BOARD_MINORS) {
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s = comedi_subdevice_from_minor(dev, minor);
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if (!s || s->subdev_flags & SDF_CMD_READ)
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read_s = s;
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if (!s || s->subdev_flags & SDF_CMD_WRITE)
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write_s = s;
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}
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cfp->last_attached = dev->attached;
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cfp->last_detach_count = dev->detach_count;
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WRITE_ONCE(cfp->read_subdev, read_s);
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WRITE_ONCE(cfp->write_subdev, write_s);
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}
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static void comedi_file_check(struct file *file)
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{
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struct comedi_file *cfp = file->private_data;
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struct comedi_device *dev = cfp->dev;
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if (cfp->last_attached != dev->attached ||
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cfp->last_detach_count != dev->detach_count)
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comedi_file_reset(file);
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}
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static struct comedi_subdevice *comedi_file_read_subdevice(struct file *file)
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{
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struct comedi_file *cfp = file->private_data;
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comedi_file_check(file);
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return READ_ONCE(cfp->read_subdev);
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}
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static struct comedi_subdevice *comedi_file_write_subdevice(struct file *file)
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{
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struct comedi_file *cfp = file->private_data;
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comedi_file_check(file);
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return READ_ONCE(cfp->write_subdev);
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}
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static int resize_async_buffer(struct comedi_device *dev,
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struct comedi_subdevice *s,
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unsigned int new_size)
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{
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struct comedi_async *async = s->async;
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int retval;
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if (new_size > async->max_bufsize)
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return -EPERM;
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if (s->busy) {
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dev_dbg(dev->class_dev,
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"subdevice is busy, cannot resize buffer\n");
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return -EBUSY;
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}
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if (comedi_buf_is_mmapped(s)) {
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dev_dbg(dev->class_dev,
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"subdevice is mmapped, cannot resize buffer\n");
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return -EBUSY;
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}
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/* make sure buffer is an integral number of pages (we round up) */
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new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK;
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retval = comedi_buf_alloc(dev, s, new_size);
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if (retval < 0)
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return retval;
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if (s->buf_change) {
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retval = s->buf_change(dev, s);
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if (retval < 0)
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return retval;
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}
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dev_dbg(dev->class_dev, "subd %d buffer resized to %i bytes\n",
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s->index, async->prealloc_bufsz);
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return 0;
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}
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/* sysfs attribute files */
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static ssize_t max_read_buffer_kb_show(struct device *csdev,
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struct device_attribute *attr, char *buf)
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{
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unsigned int minor = MINOR(csdev->devt);
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struct comedi_device *dev;
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struct comedi_subdevice *s;
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unsigned int size = 0;
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dev = comedi_dev_get_from_minor(minor);
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if (!dev)
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return -ENODEV;
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mutex_lock(&dev->mutex);
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s = comedi_read_subdevice(dev, minor);
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if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)
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size = s->async->max_bufsize / 1024;
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mutex_unlock(&dev->mutex);
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comedi_dev_put(dev);
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return snprintf(buf, PAGE_SIZE, "%u\n", size);
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}
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static ssize_t max_read_buffer_kb_store(struct device *csdev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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unsigned int minor = MINOR(csdev->devt);
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struct comedi_device *dev;
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struct comedi_subdevice *s;
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unsigned int size;
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int err;
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err = kstrtouint(buf, 10, &size);
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if (err)
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return err;
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if (size > (UINT_MAX / 1024))
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return -EINVAL;
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size *= 1024;
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dev = comedi_dev_get_from_minor(minor);
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if (!dev)
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return -ENODEV;
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mutex_lock(&dev->mutex);
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s = comedi_read_subdevice(dev, minor);
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if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)
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s->async->max_bufsize = size;
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else
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err = -EINVAL;
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mutex_unlock(&dev->mutex);
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comedi_dev_put(dev);
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return err ? err : count;
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}
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static DEVICE_ATTR_RW(max_read_buffer_kb);
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static ssize_t read_buffer_kb_show(struct device *csdev,
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struct device_attribute *attr, char *buf)
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{
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unsigned int minor = MINOR(csdev->devt);
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struct comedi_device *dev;
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struct comedi_subdevice *s;
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unsigned int size = 0;
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dev = comedi_dev_get_from_minor(minor);
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if (!dev)
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return -ENODEV;
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mutex_lock(&dev->mutex);
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s = comedi_read_subdevice(dev, minor);
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if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)
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size = s->async->prealloc_bufsz / 1024;
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mutex_unlock(&dev->mutex);
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comedi_dev_put(dev);
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return snprintf(buf, PAGE_SIZE, "%u\n", size);
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}
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static ssize_t read_buffer_kb_store(struct device *csdev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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unsigned int minor = MINOR(csdev->devt);
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struct comedi_device *dev;
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struct comedi_subdevice *s;
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unsigned int size;
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int err;
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err = kstrtouint(buf, 10, &size);
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if (err)
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return err;
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if (size > (UINT_MAX / 1024))
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return -EINVAL;
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size *= 1024;
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dev = comedi_dev_get_from_minor(minor);
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if (!dev)
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return -ENODEV;
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mutex_lock(&dev->mutex);
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s = comedi_read_subdevice(dev, minor);
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if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)
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err = resize_async_buffer(dev, s, size);
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else
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err = -EINVAL;
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mutex_unlock(&dev->mutex);
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comedi_dev_put(dev);
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return err ? err : count;
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}
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static DEVICE_ATTR_RW(read_buffer_kb);
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static ssize_t max_write_buffer_kb_show(struct device *csdev,
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struct device_attribute *attr,
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char *buf)
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{
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unsigned int minor = MINOR(csdev->devt);
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struct comedi_device *dev;
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struct comedi_subdevice *s;
|
|
unsigned int size = 0;
|
|
|
|
dev = comedi_dev_get_from_minor(minor);
|
|
if (!dev)
|
|
return -ENODEV;
|
|
|
|
mutex_lock(&dev->mutex);
|
|
s = comedi_write_subdevice(dev, minor);
|
|
if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)
|
|
size = s->async->max_bufsize / 1024;
|
|
mutex_unlock(&dev->mutex);
|
|
|
|
comedi_dev_put(dev);
|
|
return snprintf(buf, PAGE_SIZE, "%u\n", size);
|
|
}
|
|
|
|
static ssize_t max_write_buffer_kb_store(struct device *csdev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
unsigned int minor = MINOR(csdev->devt);
|
|
struct comedi_device *dev;
|
|
struct comedi_subdevice *s;
|
|
unsigned int size;
|
|
int err;
|
|
|
|
err = kstrtouint(buf, 10, &size);
|
|
if (err)
|
|
return err;
|
|
if (size > (UINT_MAX / 1024))
|
|
return -EINVAL;
|
|
size *= 1024;
|
|
|
|
dev = comedi_dev_get_from_minor(minor);
|
|
if (!dev)
|
|
return -ENODEV;
|
|
|
|
mutex_lock(&dev->mutex);
|
|
s = comedi_write_subdevice(dev, minor);
|
|
if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)
|
|
s->async->max_bufsize = size;
|
|
else
|
|
err = -EINVAL;
|
|
mutex_unlock(&dev->mutex);
|
|
|
|
comedi_dev_put(dev);
|
|
return err ? err : count;
|
|
}
|
|
static DEVICE_ATTR_RW(max_write_buffer_kb);
|
|
|
|
static ssize_t write_buffer_kb_show(struct device *csdev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
unsigned int minor = MINOR(csdev->devt);
|
|
struct comedi_device *dev;
|
|
struct comedi_subdevice *s;
|
|
unsigned int size = 0;
|
|
|
|
dev = comedi_dev_get_from_minor(minor);
|
|
if (!dev)
|
|
return -ENODEV;
|
|
|
|
mutex_lock(&dev->mutex);
|
|
s = comedi_write_subdevice(dev, minor);
|
|
if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)
|
|
size = s->async->prealloc_bufsz / 1024;
|
|
mutex_unlock(&dev->mutex);
|
|
|
|
comedi_dev_put(dev);
|
|
return snprintf(buf, PAGE_SIZE, "%u\n", size);
|
|
}
|
|
|
|
static ssize_t write_buffer_kb_store(struct device *csdev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
unsigned int minor = MINOR(csdev->devt);
|
|
struct comedi_device *dev;
|
|
struct comedi_subdevice *s;
|
|
unsigned int size;
|
|
int err;
|
|
|
|
err = kstrtouint(buf, 10, &size);
|
|
if (err)
|
|
return err;
|
|
if (size > (UINT_MAX / 1024))
|
|
return -EINVAL;
|
|
size *= 1024;
|
|
|
|
dev = comedi_dev_get_from_minor(minor);
|
|
if (!dev)
|
|
return -ENODEV;
|
|
|
|
mutex_lock(&dev->mutex);
|
|
s = comedi_write_subdevice(dev, minor);
|
|
if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)
|
|
err = resize_async_buffer(dev, s, size);
|
|
else
|
|
err = -EINVAL;
|
|
mutex_unlock(&dev->mutex);
|
|
|
|
comedi_dev_put(dev);
|
|
return err ? err : count;
|
|
}
|
|
static DEVICE_ATTR_RW(write_buffer_kb);
|
|
|
|
static struct attribute *comedi_dev_attrs[] = {
|
|
&dev_attr_max_read_buffer_kb.attr,
|
|
&dev_attr_read_buffer_kb.attr,
|
|
&dev_attr_max_write_buffer_kb.attr,
|
|
&dev_attr_write_buffer_kb.attr,
|
|
NULL,
|
|
};
|
|
ATTRIBUTE_GROUPS(comedi_dev);
|
|
|
|
static void __comedi_clear_subdevice_runflags(struct comedi_subdevice *s,
|
|
unsigned int bits)
|
|
{
|
|
s->runflags &= ~bits;
|
|
}
|
|
|
|
static void __comedi_set_subdevice_runflags(struct comedi_subdevice *s,
|
|
unsigned int bits)
|
|
{
|
|
s->runflags |= bits;
|
|
}
|
|
|
|
static void comedi_update_subdevice_runflags(struct comedi_subdevice *s,
|
|
unsigned int mask,
|
|
unsigned int bits)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&s->spin_lock, flags);
|
|
__comedi_clear_subdevice_runflags(s, mask);
|
|
__comedi_set_subdevice_runflags(s, bits & mask);
|
|
spin_unlock_irqrestore(&s->spin_lock, flags);
|
|
}
|
|
|
|
static unsigned int __comedi_get_subdevice_runflags(struct comedi_subdevice *s)
|
|
{
|
|
return s->runflags;
|
|
}
|
|
|
|
static unsigned int comedi_get_subdevice_runflags(struct comedi_subdevice *s)
|
|
{
|
|
unsigned long flags;
|
|
unsigned int runflags;
|
|
|
|
spin_lock_irqsave(&s->spin_lock, flags);
|
|
runflags = __comedi_get_subdevice_runflags(s);
|
|
spin_unlock_irqrestore(&s->spin_lock, flags);
|
|
return runflags;
|
|
}
|
|
|
|
static bool comedi_is_runflags_running(unsigned int runflags)
|
|
{
|
|
return runflags & COMEDI_SRF_RUNNING;
|
|
}
|
|
|
|
static bool comedi_is_runflags_in_error(unsigned int runflags)
|
|
{
|
|
return runflags & COMEDI_SRF_ERROR;
|
|
}
|
|
|
|
/**
|
|
* comedi_is_subdevice_running() - Check if async command running on subdevice
|
|
* @s: COMEDI subdevice.
|
|
*
|
|
* Return: %true if an asynchronous COMEDI command is active on the
|
|
* subdevice, else %false.
|
|
*/
|
|
bool comedi_is_subdevice_running(struct comedi_subdevice *s)
|
|
{
|
|
unsigned int runflags = comedi_get_subdevice_runflags(s);
|
|
|
|
return comedi_is_runflags_running(runflags);
|
|
}
|
|
EXPORT_SYMBOL_GPL(comedi_is_subdevice_running);
|
|
|
|
static bool __comedi_is_subdevice_running(struct comedi_subdevice *s)
|
|
{
|
|
unsigned int runflags = __comedi_get_subdevice_runflags(s);
|
|
|
|
return comedi_is_runflags_running(runflags);
|
|
}
|
|
|
|
bool comedi_can_auto_free_spriv(struct comedi_subdevice *s)
|
|
{
|
|
unsigned int runflags = __comedi_get_subdevice_runflags(s);
|
|
|
|
return runflags & COMEDI_SRF_FREE_SPRIV;
|
|
}
|
|
|
|
/**
|
|
* comedi_set_spriv_auto_free() - Mark subdevice private data as freeable
|
|
* @s: COMEDI subdevice.
|
|
*
|
|
* Mark the subdevice as having a pointer to private data that can be
|
|
* automatically freed when the COMEDI device is detached from the low-level
|
|
* driver.
|
|
*/
|
|
void comedi_set_spriv_auto_free(struct comedi_subdevice *s)
|
|
{
|
|
__comedi_set_subdevice_runflags(s, COMEDI_SRF_FREE_SPRIV);
|
|
}
|
|
EXPORT_SYMBOL_GPL(comedi_set_spriv_auto_free);
|
|
|
|
/**
|
|
* comedi_alloc_spriv - Allocate memory for the subdevice private data
|
|
* @s: COMEDI subdevice.
|
|
* @size: Size of the memory to allocate.
|
|
*
|
|
* Allocate memory for the subdevice private data and point @s->private
|
|
* to it. The memory will be freed automatically when the COMEDI device
|
|
* is detached from the low-level driver.
|
|
*
|
|
* Return: A pointer to the allocated memory @s->private on success.
|
|
* Return NULL on failure.
|
|
*/
|
|
void *comedi_alloc_spriv(struct comedi_subdevice *s, size_t size)
|
|
{
|
|
s->private = kzalloc(size, GFP_KERNEL);
|
|
if (s->private)
|
|
comedi_set_spriv_auto_free(s);
|
|
return s->private;
|
|
}
|
|
EXPORT_SYMBOL_GPL(comedi_alloc_spriv);
|
|
|
|
/*
|
|
* This function restores a subdevice to an idle state.
|
|
*/
|
|
static void do_become_nonbusy(struct comedi_device *dev,
|
|
struct comedi_subdevice *s)
|
|
{
|
|
struct comedi_async *async = s->async;
|
|
|
|
comedi_update_subdevice_runflags(s, COMEDI_SRF_RUNNING, 0);
|
|
if (async) {
|
|
comedi_buf_reset(s);
|
|
async->inttrig = NULL;
|
|
kfree(async->cmd.chanlist);
|
|
async->cmd.chanlist = NULL;
|
|
s->busy = NULL;
|
|
wake_up_interruptible_all(&async->wait_head);
|
|
} else {
|
|
dev_err(dev->class_dev,
|
|
"BUG: (?) do_become_nonbusy called with async=NULL\n");
|
|
s->busy = NULL;
|
|
}
|
|
}
|
|
|
|
static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (comedi_is_subdevice_running(s) && s->cancel)
|
|
ret = s->cancel(dev, s);
|
|
|
|
do_become_nonbusy(dev, s);
|
|
|
|
return ret;
|
|
}
|
|
|
|
void comedi_device_cancel_all(struct comedi_device *dev)
|
|
{
|
|
struct comedi_subdevice *s;
|
|
int i;
|
|
|
|
if (!dev->attached)
|
|
return;
|
|
|
|
for (i = 0; i < dev->n_subdevices; i++) {
|
|
s = &dev->subdevices[i];
|
|
if (s->async)
|
|
do_cancel(dev, s);
|
|
}
|
|
}
|
|
|
|
static int is_device_busy(struct comedi_device *dev)
|
|
{
|
|
struct comedi_subdevice *s;
|
|
int i;
|
|
|
|
if (!dev->attached)
|
|
return 0;
|
|
|
|
for (i = 0; i < dev->n_subdevices; i++) {
|
|
s = &dev->subdevices[i];
|
|
if (s->busy)
|
|
return 1;
|
|
if (s->async && comedi_buf_is_mmapped(s))
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* COMEDI_DEVCONFIG ioctl
|
|
* attaches (and configures) or detaches a legacy device
|
|
*
|
|
* arg:
|
|
* pointer to comedi_devconfig structure (NULL if detaching)
|
|
*
|
|
* reads:
|
|
* comedi_devconfig structure (if attaching)
|
|
*
|
|
* writes:
|
|
* nothing
|
|
*/
|
|
static int do_devconfig_ioctl(struct comedi_device *dev,
|
|
struct comedi_devconfig __user *arg)
|
|
{
|
|
struct comedi_devconfig it;
|
|
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
|
|
if (!arg) {
|
|
if (is_device_busy(dev))
|
|
return -EBUSY;
|
|
if (dev->attached) {
|
|
struct module *driver_module = dev->driver->module;
|
|
|
|
comedi_device_detach(dev);
|
|
module_put(driver_module);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
if (copy_from_user(&it, arg, sizeof(it)))
|
|
return -EFAULT;
|
|
|
|
it.board_name[COMEDI_NAMELEN - 1] = 0;
|
|
|
|
if (it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]) {
|
|
dev_warn(dev->class_dev,
|
|
"comedi_config --init_data is deprecated\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (dev->minor >= comedi_num_legacy_minors)
|
|
/* don't re-use dynamically allocated comedi devices */
|
|
return -EBUSY;
|
|
|
|
/* This increments the driver module count on success. */
|
|
return comedi_device_attach(dev, &it);
|
|
}
|
|
|
|
/*
|
|
* COMEDI_BUFCONFIG ioctl
|
|
* buffer configuration
|
|
*
|
|
* arg:
|
|
* pointer to comedi_bufconfig structure
|
|
*
|
|
* reads:
|
|
* comedi_bufconfig structure
|
|
*
|
|
* writes:
|
|
* modified comedi_bufconfig structure
|
|
*/
|
|
static int do_bufconfig_ioctl(struct comedi_device *dev,
|
|
struct comedi_bufconfig __user *arg)
|
|
{
|
|
struct comedi_bufconfig bc;
|
|
struct comedi_async *async;
|
|
struct comedi_subdevice *s;
|
|
int retval = 0;
|
|
|
|
if (copy_from_user(&bc, arg, sizeof(bc)))
|
|
return -EFAULT;
|
|
|
|
if (bc.subdevice >= dev->n_subdevices)
|
|
return -EINVAL;
|
|
|
|
s = &dev->subdevices[bc.subdevice];
|
|
async = s->async;
|
|
|
|
if (!async) {
|
|
dev_dbg(dev->class_dev,
|
|
"subdevice does not have async capability\n");
|
|
bc.size = 0;
|
|
bc.maximum_size = 0;
|
|
goto copyback;
|
|
}
|
|
|
|
if (bc.maximum_size) {
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
|
|
async->max_bufsize = bc.maximum_size;
|
|
}
|
|
|
|
if (bc.size) {
|
|
retval = resize_async_buffer(dev, s, bc.size);
|
|
if (retval < 0)
|
|
return retval;
|
|
}
|
|
|
|
bc.size = async->prealloc_bufsz;
|
|
bc.maximum_size = async->max_bufsize;
|
|
|
|
copyback:
|
|
if (copy_to_user(arg, &bc, sizeof(bc)))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* COMEDI_DEVINFO ioctl
|
|
* device info
|
|
*
|
|
* arg:
|
|
* pointer to comedi_devinfo structure
|
|
*
|
|
* reads:
|
|
* nothing
|
|
*
|
|
* writes:
|
|
* comedi_devinfo structure
|
|
*/
|
|
static int do_devinfo_ioctl(struct comedi_device *dev,
|
|
struct comedi_devinfo __user *arg,
|
|
struct file *file)
|
|
{
|
|
struct comedi_subdevice *s;
|
|
struct comedi_devinfo devinfo;
|
|
|
|
memset(&devinfo, 0, sizeof(devinfo));
|
|
|
|
/* fill devinfo structure */
|
|
devinfo.version_code = COMEDI_VERSION_CODE;
|
|
devinfo.n_subdevs = dev->n_subdevices;
|
|
strlcpy(devinfo.driver_name, dev->driver->driver_name, COMEDI_NAMELEN);
|
|
strlcpy(devinfo.board_name, dev->board_name, COMEDI_NAMELEN);
|
|
|
|
s = comedi_file_read_subdevice(file);
|
|
if (s)
|
|
devinfo.read_subdevice = s->index;
|
|
else
|
|
devinfo.read_subdevice = -1;
|
|
|
|
s = comedi_file_write_subdevice(file);
|
|
if (s)
|
|
devinfo.write_subdevice = s->index;
|
|
else
|
|
devinfo.write_subdevice = -1;
|
|
|
|
if (copy_to_user(arg, &devinfo, sizeof(devinfo)))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* COMEDI_SUBDINFO ioctl
|
|
* subdevices info
|
|
*
|
|
* arg:
|
|
* pointer to array of comedi_subdinfo structures
|
|
*
|
|
* reads:
|
|
* nothing
|
|
*
|
|
* writes:
|
|
* array of comedi_subdinfo structures
|
|
*/
|
|
static int do_subdinfo_ioctl(struct comedi_device *dev,
|
|
struct comedi_subdinfo __user *arg, void *file)
|
|
{
|
|
int ret, i;
|
|
struct comedi_subdinfo *tmp, *us;
|
|
struct comedi_subdevice *s;
|
|
|
|
tmp = kcalloc(dev->n_subdevices, sizeof(*tmp), GFP_KERNEL);
|
|
if (!tmp)
|
|
return -ENOMEM;
|
|
|
|
/* fill subdinfo structs */
|
|
for (i = 0; i < dev->n_subdevices; i++) {
|
|
s = &dev->subdevices[i];
|
|
us = tmp + i;
|
|
|
|
us->type = s->type;
|
|
us->n_chan = s->n_chan;
|
|
us->subd_flags = s->subdev_flags;
|
|
if (comedi_is_subdevice_running(s))
|
|
us->subd_flags |= SDF_RUNNING;
|
|
#define TIMER_nanosec 5 /* backwards compatibility */
|
|
us->timer_type = TIMER_nanosec;
|
|
us->len_chanlist = s->len_chanlist;
|
|
us->maxdata = s->maxdata;
|
|
if (s->range_table) {
|
|
us->range_type =
|
|
(i << 24) | (0 << 16) | (s->range_table->length);
|
|
} else {
|
|
us->range_type = 0; /* XXX */
|
|
}
|
|
|
|
if (s->busy)
|
|
us->subd_flags |= SDF_BUSY;
|
|
if (s->busy == file)
|
|
us->subd_flags |= SDF_BUSY_OWNER;
|
|
if (s->lock)
|
|
us->subd_flags |= SDF_LOCKED;
|
|
if (s->lock == file)
|
|
us->subd_flags |= SDF_LOCK_OWNER;
|
|
if (!s->maxdata && s->maxdata_list)
|
|
us->subd_flags |= SDF_MAXDATA;
|
|
if (s->range_table_list)
|
|
us->subd_flags |= SDF_RANGETYPE;
|
|
if (s->do_cmd)
|
|
us->subd_flags |= SDF_CMD;
|
|
|
|
if (s->insn_bits != &insn_inval)
|
|
us->insn_bits_support = COMEDI_SUPPORTED;
|
|
else
|
|
us->insn_bits_support = COMEDI_UNSUPPORTED;
|
|
}
|
|
|
|
ret = copy_to_user(arg, tmp, dev->n_subdevices * sizeof(*tmp));
|
|
|
|
kfree(tmp);
|
|
|
|
return ret ? -EFAULT : 0;
|
|
}
|
|
|
|
/*
|
|
* COMEDI_CHANINFO ioctl
|
|
* subdevice channel info
|
|
*
|
|
* arg:
|
|
* pointer to comedi_chaninfo structure
|
|
*
|
|
* reads:
|
|
* comedi_chaninfo structure
|
|
*
|
|
* writes:
|
|
* array of maxdata values to chaninfo->maxdata_list if requested
|
|
* array of range table lengths to chaninfo->range_table_list if requested
|
|
*/
|
|
static int do_chaninfo_ioctl(struct comedi_device *dev,
|
|
struct comedi_chaninfo __user *arg)
|
|
{
|
|
struct comedi_subdevice *s;
|
|
struct comedi_chaninfo it;
|
|
|
|
if (copy_from_user(&it, arg, sizeof(it)))
|
|
return -EFAULT;
|
|
|
|
if (it.subdev >= dev->n_subdevices)
|
|
return -EINVAL;
|
|
s = &dev->subdevices[it.subdev];
|
|
|
|
if (it.maxdata_list) {
|
|
if (s->maxdata || !s->maxdata_list)
|
|
return -EINVAL;
|
|
if (copy_to_user(it.maxdata_list, s->maxdata_list,
|
|
s->n_chan * sizeof(unsigned int)))
|
|
return -EFAULT;
|
|
}
|
|
|
|
if (it.flaglist)
|
|
return -EINVAL; /* flaglist not supported */
|
|
|
|
if (it.rangelist) {
|
|
int i;
|
|
|
|
if (!s->range_table_list)
|
|
return -EINVAL;
|
|
for (i = 0; i < s->n_chan; i++) {
|
|
int x;
|
|
|
|
x = (dev->minor << 28) | (it.subdev << 24) | (i << 16) |
|
|
(s->range_table_list[i]->length);
|
|
if (put_user(x, it.rangelist + i))
|
|
return -EFAULT;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* COMEDI_BUFINFO ioctl
|
|
* buffer information
|
|
*
|
|
* arg:
|
|
* pointer to comedi_bufinfo structure
|
|
*
|
|
* reads:
|
|
* comedi_bufinfo structure
|
|
*
|
|
* writes:
|
|
* modified comedi_bufinfo structure
|
|
*/
|
|
static int do_bufinfo_ioctl(struct comedi_device *dev,
|
|
struct comedi_bufinfo __user *arg, void *file)
|
|
{
|
|
struct comedi_bufinfo bi;
|
|
struct comedi_subdevice *s;
|
|
struct comedi_async *async;
|
|
unsigned int runflags;
|
|
int retval = 0;
|
|
bool become_nonbusy = false;
|
|
|
|
if (copy_from_user(&bi, arg, sizeof(bi)))
|
|
return -EFAULT;
|
|
|
|
if (bi.subdevice >= dev->n_subdevices)
|
|
return -EINVAL;
|
|
|
|
s = &dev->subdevices[bi.subdevice];
|
|
|
|
async = s->async;
|
|
|
|
if (!async || s->busy != file)
|
|
return -EINVAL;
|
|
|
|
runflags = comedi_get_subdevice_runflags(s);
|
|
if (!(async->cmd.flags & CMDF_WRITE)) {
|
|
/* command was set up in "read" direction */
|
|
if (bi.bytes_read) {
|
|
comedi_buf_read_alloc(s, bi.bytes_read);
|
|
bi.bytes_read = comedi_buf_read_free(s, bi.bytes_read);
|
|
}
|
|
/*
|
|
* If nothing left to read, and command has stopped, and
|
|
* {"read" position not updated or command stopped normally},
|
|
* then become non-busy.
|
|
*/
|
|
if (comedi_buf_read_n_available(s) == 0 &&
|
|
!comedi_is_runflags_running(runflags) &&
|
|
(bi.bytes_read == 0 ||
|
|
!comedi_is_runflags_in_error(runflags))) {
|
|
become_nonbusy = true;
|
|
if (comedi_is_runflags_in_error(runflags))
|
|
retval = -EPIPE;
|
|
}
|
|
bi.bytes_written = 0;
|
|
} else {
|
|
/* command was set up in "write" direction */
|
|
if (!comedi_is_runflags_running(runflags)) {
|
|
bi.bytes_written = 0;
|
|
become_nonbusy = true;
|
|
if (comedi_is_runflags_in_error(runflags))
|
|
retval = -EPIPE;
|
|
} else if (bi.bytes_written) {
|
|
comedi_buf_write_alloc(s, bi.bytes_written);
|
|
bi.bytes_written =
|
|
comedi_buf_write_free(s, bi.bytes_written);
|
|
}
|
|
bi.bytes_read = 0;
|
|
}
|
|
|
|
bi.buf_write_count = async->buf_write_count;
|
|
bi.buf_write_ptr = async->buf_write_ptr;
|
|
bi.buf_read_count = async->buf_read_count;
|
|
bi.buf_read_ptr = async->buf_read_ptr;
|
|
|
|
if (become_nonbusy)
|
|
do_become_nonbusy(dev, s);
|
|
|
|
if (retval)
|
|
return retval;
|
|
|
|
if (copy_to_user(arg, &bi, sizeof(bi)))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int check_insn_config_length(struct comedi_insn *insn,
|
|
unsigned int *data)
|
|
{
|
|
if (insn->n < 1)
|
|
return -EINVAL;
|
|
|
|
switch (data[0]) {
|
|
case INSN_CONFIG_DIO_OUTPUT:
|
|
case INSN_CONFIG_DIO_INPUT:
|
|
case INSN_CONFIG_DISARM:
|
|
case INSN_CONFIG_RESET:
|
|
if (insn->n == 1)
|
|
return 0;
|
|
break;
|
|
case INSN_CONFIG_ARM:
|
|
case INSN_CONFIG_DIO_QUERY:
|
|
case INSN_CONFIG_BLOCK_SIZE:
|
|
case INSN_CONFIG_FILTER:
|
|
case INSN_CONFIG_SERIAL_CLOCK:
|
|
case INSN_CONFIG_BIDIRECTIONAL_DATA:
|
|
case INSN_CONFIG_ALT_SOURCE:
|
|
case INSN_CONFIG_SET_COUNTER_MODE:
|
|
case INSN_CONFIG_8254_READ_STATUS:
|
|
case INSN_CONFIG_SET_ROUTING:
|
|
case INSN_CONFIG_GET_ROUTING:
|
|
case INSN_CONFIG_GET_PWM_STATUS:
|
|
case INSN_CONFIG_PWM_SET_PERIOD:
|
|
case INSN_CONFIG_PWM_GET_PERIOD:
|
|
if (insn->n == 2)
|
|
return 0;
|
|
break;
|
|
case INSN_CONFIG_SET_GATE_SRC:
|
|
case INSN_CONFIG_GET_GATE_SRC:
|
|
case INSN_CONFIG_SET_CLOCK_SRC:
|
|
case INSN_CONFIG_GET_CLOCK_SRC:
|
|
case INSN_CONFIG_SET_OTHER_SRC:
|
|
case INSN_CONFIG_GET_COUNTER_STATUS:
|
|
case INSN_CONFIG_PWM_SET_H_BRIDGE:
|
|
case INSN_CONFIG_PWM_GET_H_BRIDGE:
|
|
case INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE:
|
|
if (insn->n == 3)
|
|
return 0;
|
|
break;
|
|
case INSN_CONFIG_PWM_OUTPUT:
|
|
case INSN_CONFIG_ANALOG_TRIG:
|
|
if (insn->n == 5)
|
|
return 0;
|
|
break;
|
|
case INSN_CONFIG_DIGITAL_TRIG:
|
|
if (insn->n == 6)
|
|
return 0;
|
|
break;
|
|
/*
|
|
* by default we allow the insn since we don't have checks for
|
|
* all possible cases yet
|
|
*/
|
|
default:
|
|
pr_warn("No check for data length of config insn id %i is implemented\n",
|
|
data[0]);
|
|
pr_warn("Add a check to %s in %s\n", __func__, __FILE__);
|
|
pr_warn("Assuming n=%i is correct\n", insn->n);
|
|
return 0;
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn,
|
|
unsigned int *data, void *file)
|
|
{
|
|
struct comedi_subdevice *s;
|
|
int ret = 0;
|
|
int i;
|
|
|
|
if (insn->insn & INSN_MASK_SPECIAL) {
|
|
/* a non-subdevice instruction */
|
|
|
|
switch (insn->insn) {
|
|
case INSN_GTOD:
|
|
{
|
|
struct timespec64 tv;
|
|
|
|
if (insn->n != 2) {
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
ktime_get_real_ts64(&tv);
|
|
/* unsigned data safe until 2106 */
|
|
data[0] = (unsigned int)tv.tv_sec;
|
|
data[1] = tv.tv_nsec / NSEC_PER_USEC;
|
|
ret = 2;
|
|
|
|
break;
|
|
}
|
|
case INSN_WAIT:
|
|
if (insn->n != 1 || data[0] >= 100000) {
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
udelay(data[0] / 1000);
|
|
ret = 1;
|
|
break;
|
|
case INSN_INTTRIG:
|
|
if (insn->n != 1) {
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
if (insn->subdev >= dev->n_subdevices) {
|
|
dev_dbg(dev->class_dev,
|
|
"%d not usable subdevice\n",
|
|
insn->subdev);
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
s = &dev->subdevices[insn->subdev];
|
|
if (!s->async) {
|
|
dev_dbg(dev->class_dev, "no async\n");
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
if (!s->async->inttrig) {
|
|
dev_dbg(dev->class_dev, "no inttrig\n");
|
|
ret = -EAGAIN;
|
|
break;
|
|
}
|
|
ret = s->async->inttrig(dev, s, data[0]);
|
|
if (ret >= 0)
|
|
ret = 1;
|
|
break;
|
|
default:
|
|
dev_dbg(dev->class_dev, "invalid insn\n");
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
} else {
|
|
/* a subdevice instruction */
|
|
unsigned int maxdata;
|
|
|
|
if (insn->subdev >= dev->n_subdevices) {
|
|
dev_dbg(dev->class_dev, "subdevice %d out of range\n",
|
|
insn->subdev);
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
s = &dev->subdevices[insn->subdev];
|
|
|
|
if (s->type == COMEDI_SUBD_UNUSED) {
|
|
dev_dbg(dev->class_dev, "%d not usable subdevice\n",
|
|
insn->subdev);
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
|
|
/* are we locked? (ioctl lock) */
|
|
if (s->lock && s->lock != file) {
|
|
dev_dbg(dev->class_dev, "device locked\n");
|
|
ret = -EACCES;
|
|
goto out;
|
|
}
|
|
|
|
ret = comedi_check_chanlist(s, 1, &insn->chanspec);
|
|
if (ret < 0) {
|
|
ret = -EINVAL;
|
|
dev_dbg(dev->class_dev, "bad chanspec\n");
|
|
goto out;
|
|
}
|
|
|
|
if (s->busy) {
|
|
ret = -EBUSY;
|
|
goto out;
|
|
}
|
|
/* This looks arbitrary. It is. */
|
|
s->busy = parse_insn;
|
|
switch (insn->insn) {
|
|
case INSN_READ:
|
|
ret = s->insn_read(dev, s, insn, data);
|
|
if (ret == -ETIMEDOUT) {
|
|
dev_dbg(dev->class_dev,
|
|
"subdevice %d read instruction timed out\n",
|
|
s->index);
|
|
}
|
|
break;
|
|
case INSN_WRITE:
|
|
maxdata = s->maxdata_list
|
|
? s->maxdata_list[CR_CHAN(insn->chanspec)]
|
|
: s->maxdata;
|
|
for (i = 0; i < insn->n; ++i) {
|
|
if (data[i] > maxdata) {
|
|
ret = -EINVAL;
|
|
dev_dbg(dev->class_dev,
|
|
"bad data value(s)\n");
|
|
break;
|
|
}
|
|
}
|
|
if (ret == 0) {
|
|
ret = s->insn_write(dev, s, insn, data);
|
|
if (ret == -ETIMEDOUT) {
|
|
dev_dbg(dev->class_dev,
|
|
"subdevice %d write instruction timed out\n",
|
|
s->index);
|
|
}
|
|
}
|
|
break;
|
|
case INSN_BITS:
|
|
if (insn->n != 2) {
|
|
ret = -EINVAL;
|
|
} else {
|
|
/*
|
|
* Most drivers ignore the base channel in
|
|
* insn->chanspec. Fix this here if
|
|
* the subdevice has <= 32 channels.
|
|
*/
|
|
unsigned int orig_mask = data[0];
|
|
unsigned int shift = 0;
|
|
|
|
if (s->n_chan <= 32) {
|
|
shift = CR_CHAN(insn->chanspec);
|
|
if (shift > 0) {
|
|
insn->chanspec = 0;
|
|
data[0] <<= shift;
|
|
data[1] <<= shift;
|
|
}
|
|
}
|
|
ret = s->insn_bits(dev, s, insn, data);
|
|
data[0] = orig_mask;
|
|
if (shift > 0)
|
|
data[1] >>= shift;
|
|
}
|
|
break;
|
|
case INSN_CONFIG:
|
|
ret = check_insn_config_length(insn, data);
|
|
if (ret)
|
|
break;
|
|
ret = s->insn_config(dev, s, insn, data);
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
s->busy = NULL;
|
|
}
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* COMEDI_INSNLIST ioctl
|
|
* synchronous instruction list
|
|
*
|
|
* arg:
|
|
* pointer to comedi_insnlist structure
|
|
*
|
|
* reads:
|
|
* comedi_insnlist structure
|
|
* array of comedi_insn structures from insnlist->insns pointer
|
|
* data (for writes) from insns[].data pointers
|
|
*
|
|
* writes:
|
|
* data (for reads) to insns[].data pointers
|
|
*/
|
|
/* arbitrary limits */
|
|
#define MAX_SAMPLES 256
|
|
static int do_insnlist_ioctl(struct comedi_device *dev,
|
|
struct comedi_insnlist __user *arg, void *file)
|
|
{
|
|
struct comedi_insnlist insnlist;
|
|
struct comedi_insn *insns = NULL;
|
|
unsigned int *data = NULL;
|
|
int i = 0;
|
|
int ret = 0;
|
|
|
|
if (copy_from_user(&insnlist, arg, sizeof(insnlist)))
|
|
return -EFAULT;
|
|
|
|
data = kmalloc_array(MAX_SAMPLES, sizeof(unsigned int), GFP_KERNEL);
|
|
if (!data) {
|
|
ret = -ENOMEM;
|
|
goto error;
|
|
}
|
|
|
|
insns = kcalloc(insnlist.n_insns, sizeof(*insns), GFP_KERNEL);
|
|
if (!insns) {
|
|
ret = -ENOMEM;
|
|
goto error;
|
|
}
|
|
|
|
if (copy_from_user(insns, insnlist.insns,
|
|
sizeof(*insns) * insnlist.n_insns)) {
|
|
dev_dbg(dev->class_dev, "copy_from_user failed\n");
|
|
ret = -EFAULT;
|
|
goto error;
|
|
}
|
|
|
|
for (i = 0; i < insnlist.n_insns; i++) {
|
|
if (insns[i].n > MAX_SAMPLES) {
|
|
dev_dbg(dev->class_dev,
|
|
"number of samples too large\n");
|
|
ret = -EINVAL;
|
|
goto error;
|
|
}
|
|
if (insns[i].insn & INSN_MASK_WRITE) {
|
|
if (copy_from_user(data, insns[i].data,
|
|
insns[i].n * sizeof(unsigned int))) {
|
|
dev_dbg(dev->class_dev,
|
|
"copy_from_user failed\n");
|
|
ret = -EFAULT;
|
|
goto error;
|
|
}
|
|
}
|
|
ret = parse_insn(dev, insns + i, data, file);
|
|
if (ret < 0)
|
|
goto error;
|
|
if (insns[i].insn & INSN_MASK_READ) {
|
|
if (copy_to_user(insns[i].data, data,
|
|
insns[i].n * sizeof(unsigned int))) {
|
|
dev_dbg(dev->class_dev,
|
|
"copy_to_user failed\n");
|
|
ret = -EFAULT;
|
|
goto error;
|
|
}
|
|
}
|
|
if (need_resched())
|
|
schedule();
|
|
}
|
|
|
|
error:
|
|
kfree(insns);
|
|
kfree(data);
|
|
|
|
if (ret < 0)
|
|
return ret;
|
|
return i;
|
|
}
|
|
|
|
/*
|
|
* COMEDI_INSN ioctl
|
|
* synchronous instruction
|
|
*
|
|
* arg:
|
|
* pointer to comedi_insn structure
|
|
*
|
|
* reads:
|
|
* comedi_insn structure
|
|
* data (for writes) from insn->data pointer
|
|
*
|
|
* writes:
|
|
* data (for reads) to insn->data pointer
|
|
*/
|
|
static int do_insn_ioctl(struct comedi_device *dev,
|
|
struct comedi_insn __user *arg, void *file)
|
|
{
|
|
struct comedi_insn insn;
|
|
unsigned int *data = NULL;
|
|
int ret = 0;
|
|
|
|
data = kmalloc_array(MAX_SAMPLES, sizeof(unsigned int), GFP_KERNEL);
|
|
if (!data) {
|
|
ret = -ENOMEM;
|
|
goto error;
|
|
}
|
|
|
|
if (copy_from_user(&insn, arg, sizeof(insn))) {
|
|
ret = -EFAULT;
|
|
goto error;
|
|
}
|
|
|
|
/* This is where the behavior of insn and insnlist deviate. */
|
|
if (insn.n > MAX_SAMPLES)
|
|
insn.n = MAX_SAMPLES;
|
|
if (insn.insn & INSN_MASK_WRITE) {
|
|
if (copy_from_user(data,
|
|
insn.data,
|
|
insn.n * sizeof(unsigned int))) {
|
|
ret = -EFAULT;
|
|
goto error;
|
|
}
|
|
}
|
|
ret = parse_insn(dev, &insn, data, file);
|
|
if (ret < 0)
|
|
goto error;
|
|
if (insn.insn & INSN_MASK_READ) {
|
|
if (copy_to_user(insn.data,
|
|
data,
|
|
insn.n * sizeof(unsigned int))) {
|
|
ret = -EFAULT;
|
|
goto error;
|
|
}
|
|
}
|
|
ret = insn.n;
|
|
|
|
error:
|
|
kfree(data);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int __comedi_get_user_cmd(struct comedi_device *dev,
|
|
struct comedi_cmd __user *arg,
|
|
struct comedi_cmd *cmd)
|
|
{
|
|
struct comedi_subdevice *s;
|
|
|
|
if (copy_from_user(cmd, arg, sizeof(*cmd))) {
|
|
dev_dbg(dev->class_dev, "bad cmd address\n");
|
|
return -EFAULT;
|
|
}
|
|
|
|
if (cmd->subdev >= dev->n_subdevices) {
|
|
dev_dbg(dev->class_dev, "%d no such subdevice\n", cmd->subdev);
|
|
return -ENODEV;
|
|
}
|
|
|
|
s = &dev->subdevices[cmd->subdev];
|
|
|
|
if (s->type == COMEDI_SUBD_UNUSED) {
|
|
dev_dbg(dev->class_dev, "%d not valid subdevice\n",
|
|
cmd->subdev);
|
|
return -EIO;
|
|
}
|
|
|
|
if (!s->do_cmd || !s->do_cmdtest || !s->async) {
|
|
dev_dbg(dev->class_dev,
|
|
"subdevice %d does not support commands\n",
|
|
cmd->subdev);
|
|
return -EIO;
|
|
}
|
|
|
|
/* make sure channel/gain list isn't too long */
|
|
if (cmd->chanlist_len > s->len_chanlist) {
|
|
dev_dbg(dev->class_dev, "channel/gain list too long %d > %d\n",
|
|
cmd->chanlist_len, s->len_chanlist);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Set the CMDF_WRITE flag to the correct state if the subdevice
|
|
* supports only "read" commands or only "write" commands.
|
|
*/
|
|
switch (s->subdev_flags & (SDF_CMD_READ | SDF_CMD_WRITE)) {
|
|
case SDF_CMD_READ:
|
|
cmd->flags &= ~CMDF_WRITE;
|
|
break;
|
|
case SDF_CMD_WRITE:
|
|
cmd->flags |= CMDF_WRITE;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __comedi_get_user_chanlist(struct comedi_device *dev,
|
|
struct comedi_subdevice *s,
|
|
unsigned int __user *user_chanlist,
|
|
struct comedi_cmd *cmd)
|
|
{
|
|
unsigned int *chanlist;
|
|
int ret;
|
|
|
|
cmd->chanlist = NULL;
|
|
chanlist = memdup_user(user_chanlist,
|
|
cmd->chanlist_len * sizeof(unsigned int));
|
|
if (IS_ERR(chanlist))
|
|
return PTR_ERR(chanlist);
|
|
|
|
/* make sure each element in channel/gain list is valid */
|
|
ret = comedi_check_chanlist(s, cmd->chanlist_len, chanlist);
|
|
if (ret < 0) {
|
|
kfree(chanlist);
|
|
return ret;
|
|
}
|
|
|
|
cmd->chanlist = chanlist;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* COMEDI_CMD ioctl
|
|
* asynchronous acquisition command set-up
|
|
*
|
|
* arg:
|
|
* pointer to comedi_cmd structure
|
|
*
|
|
* reads:
|
|
* comedi_cmd structure
|
|
* channel/range list from cmd->chanlist pointer
|
|
*
|
|
* writes:
|
|
* possibly modified comedi_cmd structure (when -EAGAIN returned)
|
|
*/
|
|
static int do_cmd_ioctl(struct comedi_device *dev,
|
|
struct comedi_cmd __user *arg, void *file)
|
|
{
|
|
struct comedi_cmd cmd;
|
|
struct comedi_subdevice *s;
|
|
struct comedi_async *async;
|
|
unsigned int __user *user_chanlist;
|
|
int ret;
|
|
|
|
/* get the user's cmd and do some simple validation */
|
|
ret = __comedi_get_user_cmd(dev, arg, &cmd);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* save user's chanlist pointer so it can be restored later */
|
|
user_chanlist = (unsigned int __user *)cmd.chanlist;
|
|
|
|
s = &dev->subdevices[cmd.subdev];
|
|
async = s->async;
|
|
|
|
/* are we locked? (ioctl lock) */
|
|
if (s->lock && s->lock != file) {
|
|
dev_dbg(dev->class_dev, "subdevice locked\n");
|
|
return -EACCES;
|
|
}
|
|
|
|
/* are we busy? */
|
|
if (s->busy) {
|
|
dev_dbg(dev->class_dev, "subdevice busy\n");
|
|
return -EBUSY;
|
|
}
|
|
|
|
/* make sure channel/gain list isn't too short */
|
|
if (cmd.chanlist_len < 1) {
|
|
dev_dbg(dev->class_dev, "channel/gain list too short %u < 1\n",
|
|
cmd.chanlist_len);
|
|
return -EINVAL;
|
|
}
|
|
|
|
async->cmd = cmd;
|
|
async->cmd.data = NULL;
|
|
|
|
/* load channel/gain list */
|
|
ret = __comedi_get_user_chanlist(dev, s, user_chanlist, &async->cmd);
|
|
if (ret)
|
|
goto cleanup;
|
|
|
|
ret = s->do_cmdtest(dev, s, &async->cmd);
|
|
|
|
if (async->cmd.flags & CMDF_BOGUS || ret) {
|
|
dev_dbg(dev->class_dev, "test returned %d\n", ret);
|
|
cmd = async->cmd;
|
|
/* restore chanlist pointer before copying back */
|
|
cmd.chanlist = (unsigned int __force *)user_chanlist;
|
|
cmd.data = NULL;
|
|
if (copy_to_user(arg, &cmd, sizeof(cmd))) {
|
|
dev_dbg(dev->class_dev, "fault writing cmd\n");
|
|
ret = -EFAULT;
|
|
goto cleanup;
|
|
}
|
|
ret = -EAGAIN;
|
|
goto cleanup;
|
|
}
|
|
|
|
if (!async->prealloc_bufsz) {
|
|
ret = -ENOMEM;
|
|
dev_dbg(dev->class_dev, "no buffer (?)\n");
|
|
goto cleanup;
|
|
}
|
|
|
|
comedi_buf_reset(s);
|
|
|
|
async->cb_mask = COMEDI_CB_BLOCK | COMEDI_CB_CANCEL_MASK;
|
|
if (async->cmd.flags & CMDF_WAKE_EOS)
|
|
async->cb_mask |= COMEDI_CB_EOS;
|
|
|
|
comedi_update_subdevice_runflags(s, COMEDI_SRF_BUSY_MASK,
|
|
COMEDI_SRF_RUNNING);
|
|
|
|
/*
|
|
* Set s->busy _after_ setting COMEDI_SRF_RUNNING flag to avoid
|
|
* race with comedi_read() or comedi_write().
|
|
*/
|
|
s->busy = file;
|
|
ret = s->do_cmd(dev, s);
|
|
if (ret == 0)
|
|
return 0;
|
|
|
|
cleanup:
|
|
do_become_nonbusy(dev, s);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* COMEDI_CMDTEST ioctl
|
|
* asynchronous acquisition command testing
|
|
*
|
|
* arg:
|
|
* pointer to comedi_cmd structure
|
|
*
|
|
* reads:
|
|
* comedi_cmd structure
|
|
* channel/range list from cmd->chanlist pointer
|
|
*
|
|
* writes:
|
|
* possibly modified comedi_cmd structure
|
|
*/
|
|
static int do_cmdtest_ioctl(struct comedi_device *dev,
|
|
struct comedi_cmd __user *arg, void *file)
|
|
{
|
|
struct comedi_cmd cmd;
|
|
struct comedi_subdevice *s;
|
|
unsigned int __user *user_chanlist;
|
|
int ret;
|
|
|
|
/* get the user's cmd and do some simple validation */
|
|
ret = __comedi_get_user_cmd(dev, arg, &cmd);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* save user's chanlist pointer so it can be restored later */
|
|
user_chanlist = (unsigned int __user *)cmd.chanlist;
|
|
|
|
s = &dev->subdevices[cmd.subdev];
|
|
|
|
/* user_chanlist can be NULL for COMEDI_CMDTEST ioctl */
|
|
if (user_chanlist) {
|
|
/* load channel/gain list */
|
|
ret = __comedi_get_user_chanlist(dev, s, user_chanlist, &cmd);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
ret = s->do_cmdtest(dev, s, &cmd);
|
|
|
|
kfree(cmd.chanlist); /* free kernel copy of user chanlist */
|
|
|
|
/* restore chanlist pointer before copying back */
|
|
cmd.chanlist = (unsigned int __force *)user_chanlist;
|
|
|
|
if (copy_to_user(arg, &cmd, sizeof(cmd))) {
|
|
dev_dbg(dev->class_dev, "bad cmd address\n");
|
|
ret = -EFAULT;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* COMEDI_LOCK ioctl
|
|
* lock subdevice
|
|
*
|
|
* arg:
|
|
* subdevice number
|
|
*
|
|
* reads:
|
|
* nothing
|
|
*
|
|
* writes:
|
|
* nothing
|
|
*/
|
|
static int do_lock_ioctl(struct comedi_device *dev, unsigned long arg,
|
|
void *file)
|
|
{
|
|
int ret = 0;
|
|
unsigned long flags;
|
|
struct comedi_subdevice *s;
|
|
|
|
if (arg >= dev->n_subdevices)
|
|
return -EINVAL;
|
|
s = &dev->subdevices[arg];
|
|
|
|
spin_lock_irqsave(&s->spin_lock, flags);
|
|
if (s->busy || s->lock)
|
|
ret = -EBUSY;
|
|
else
|
|
s->lock = file;
|
|
spin_unlock_irqrestore(&s->spin_lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* COMEDI_UNLOCK ioctl
|
|
* unlock subdevice
|
|
*
|
|
* arg:
|
|
* subdevice number
|
|
*
|
|
* reads:
|
|
* nothing
|
|
*
|
|
* writes:
|
|
* nothing
|
|
*/
|
|
static int do_unlock_ioctl(struct comedi_device *dev, unsigned long arg,
|
|
void *file)
|
|
{
|
|
struct comedi_subdevice *s;
|
|
|
|
if (arg >= dev->n_subdevices)
|
|
return -EINVAL;
|
|
s = &dev->subdevices[arg];
|
|
|
|
if (s->busy)
|
|
return -EBUSY;
|
|
|
|
if (s->lock && s->lock != file)
|
|
return -EACCES;
|
|
|
|
if (s->lock == file)
|
|
s->lock = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* COMEDI_CANCEL ioctl
|
|
* cancel asynchronous acquisition
|
|
*
|
|
* arg:
|
|
* subdevice number
|
|
*
|
|
* reads:
|
|
* nothing
|
|
*
|
|
* writes:
|
|
* nothing
|
|
*/
|
|
static int do_cancel_ioctl(struct comedi_device *dev, unsigned long arg,
|
|
void *file)
|
|
{
|
|
struct comedi_subdevice *s;
|
|
|
|
if (arg >= dev->n_subdevices)
|
|
return -EINVAL;
|
|
s = &dev->subdevices[arg];
|
|
if (!s->async)
|
|
return -EINVAL;
|
|
|
|
if (!s->busy)
|
|
return 0;
|
|
|
|
if (s->busy != file)
|
|
return -EBUSY;
|
|
|
|
return do_cancel(dev, s);
|
|
}
|
|
|
|
/*
|
|
* COMEDI_POLL ioctl
|
|
* instructs driver to synchronize buffers
|
|
*
|
|
* arg:
|
|
* subdevice number
|
|
*
|
|
* reads:
|
|
* nothing
|
|
*
|
|
* writes:
|
|
* nothing
|
|
*/
|
|
static int do_poll_ioctl(struct comedi_device *dev, unsigned long arg,
|
|
void *file)
|
|
{
|
|
struct comedi_subdevice *s;
|
|
|
|
if (arg >= dev->n_subdevices)
|
|
return -EINVAL;
|
|
s = &dev->subdevices[arg];
|
|
|
|
if (!s->busy)
|
|
return 0;
|
|
|
|
if (s->busy != file)
|
|
return -EBUSY;
|
|
|
|
if (s->poll)
|
|
return s->poll(dev, s);
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* COMEDI_SETRSUBD ioctl
|
|
* sets the current "read" subdevice on a per-file basis
|
|
*
|
|
* arg:
|
|
* subdevice number
|
|
*
|
|
* reads:
|
|
* nothing
|
|
*
|
|
* writes:
|
|
* nothing
|
|
*/
|
|
static int do_setrsubd_ioctl(struct comedi_device *dev, unsigned long arg,
|
|
struct file *file)
|
|
{
|
|
struct comedi_file *cfp = file->private_data;
|
|
struct comedi_subdevice *s_old, *s_new;
|
|
|
|
if (arg >= dev->n_subdevices)
|
|
return -EINVAL;
|
|
|
|
s_new = &dev->subdevices[arg];
|
|
s_old = comedi_file_read_subdevice(file);
|
|
if (s_old == s_new)
|
|
return 0; /* no change */
|
|
|
|
if (!(s_new->subdev_flags & SDF_CMD_READ))
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* Check the file isn't still busy handling a "read" command on the
|
|
* old subdevice (if any).
|
|
*/
|
|
if (s_old && s_old->busy == file && s_old->async &&
|
|
!(s_old->async->cmd.flags & CMDF_WRITE))
|
|
return -EBUSY;
|
|
|
|
WRITE_ONCE(cfp->read_subdev, s_new);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* COMEDI_SETWSUBD ioctl
|
|
* sets the current "write" subdevice on a per-file basis
|
|
*
|
|
* arg:
|
|
* subdevice number
|
|
*
|
|
* reads:
|
|
* nothing
|
|
*
|
|
* writes:
|
|
* nothing
|
|
*/
|
|
static int do_setwsubd_ioctl(struct comedi_device *dev, unsigned long arg,
|
|
struct file *file)
|
|
{
|
|
struct comedi_file *cfp = file->private_data;
|
|
struct comedi_subdevice *s_old, *s_new;
|
|
|
|
if (arg >= dev->n_subdevices)
|
|
return -EINVAL;
|
|
|
|
s_new = &dev->subdevices[arg];
|
|
s_old = comedi_file_write_subdevice(file);
|
|
if (s_old == s_new)
|
|
return 0; /* no change */
|
|
|
|
if (!(s_new->subdev_flags & SDF_CMD_WRITE))
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* Check the file isn't still busy handling a "write" command on the
|
|
* old subdevice (if any).
|
|
*/
|
|
if (s_old && s_old->busy == file && s_old->async &&
|
|
(s_old->async->cmd.flags & CMDF_WRITE))
|
|
return -EBUSY;
|
|
|
|
WRITE_ONCE(cfp->write_subdev, s_new);
|
|
return 0;
|
|
}
|
|
|
|
static long comedi_unlocked_ioctl(struct file *file, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
unsigned int minor = iminor(file_inode(file));
|
|
struct comedi_file *cfp = file->private_data;
|
|
struct comedi_device *dev = cfp->dev;
|
|
int rc;
|
|
|
|
mutex_lock(&dev->mutex);
|
|
|
|
/*
|
|
* Device config is special, because it must work on
|
|
* an unconfigured device.
|
|
*/
|
|
if (cmd == COMEDI_DEVCONFIG) {
|
|
if (minor >= COMEDI_NUM_BOARD_MINORS) {
|
|
/* Device config not appropriate on non-board minors. */
|
|
rc = -ENOTTY;
|
|
goto done;
|
|
}
|
|
rc = do_devconfig_ioctl(dev,
|
|
(struct comedi_devconfig __user *)arg);
|
|
if (rc == 0) {
|
|
if (arg == 0 &&
|
|
dev->minor >= comedi_num_legacy_minors) {
|
|
/*
|
|
* Successfully unconfigured a dynamically
|
|
* allocated device. Try and remove it.
|
|
*/
|
|
if (comedi_clear_board_dev(dev)) {
|
|
mutex_unlock(&dev->mutex);
|
|
comedi_free_board_dev(dev);
|
|
return rc;
|
|
}
|
|
}
|
|
}
|
|
goto done;
|
|
}
|
|
|
|
if (!dev->attached) {
|
|
dev_dbg(dev->class_dev, "no driver attached\n");
|
|
rc = -ENODEV;
|
|
goto done;
|
|
}
|
|
|
|
switch (cmd) {
|
|
case COMEDI_BUFCONFIG:
|
|
rc = do_bufconfig_ioctl(dev,
|
|
(struct comedi_bufconfig __user *)arg);
|
|
break;
|
|
case COMEDI_DEVINFO:
|
|
rc = do_devinfo_ioctl(dev, (struct comedi_devinfo __user *)arg,
|
|
file);
|
|
break;
|
|
case COMEDI_SUBDINFO:
|
|
rc = do_subdinfo_ioctl(dev,
|
|
(struct comedi_subdinfo __user *)arg,
|
|
file);
|
|
break;
|
|
case COMEDI_CHANINFO:
|
|
rc = do_chaninfo_ioctl(dev, (void __user *)arg);
|
|
break;
|
|
case COMEDI_RANGEINFO:
|
|
rc = do_rangeinfo_ioctl(dev, (void __user *)arg);
|
|
break;
|
|
case COMEDI_BUFINFO:
|
|
rc = do_bufinfo_ioctl(dev,
|
|
(struct comedi_bufinfo __user *)arg,
|
|
file);
|
|
break;
|
|
case COMEDI_LOCK:
|
|
rc = do_lock_ioctl(dev, arg, file);
|
|
break;
|
|
case COMEDI_UNLOCK:
|
|
rc = do_unlock_ioctl(dev, arg, file);
|
|
break;
|
|
case COMEDI_CANCEL:
|
|
rc = do_cancel_ioctl(dev, arg, file);
|
|
break;
|
|
case COMEDI_CMD:
|
|
rc = do_cmd_ioctl(dev, (struct comedi_cmd __user *)arg, file);
|
|
break;
|
|
case COMEDI_CMDTEST:
|
|
rc = do_cmdtest_ioctl(dev, (struct comedi_cmd __user *)arg,
|
|
file);
|
|
break;
|
|
case COMEDI_INSNLIST:
|
|
rc = do_insnlist_ioctl(dev,
|
|
(struct comedi_insnlist __user *)arg,
|
|
file);
|
|
break;
|
|
case COMEDI_INSN:
|
|
rc = do_insn_ioctl(dev, (struct comedi_insn __user *)arg,
|
|
file);
|
|
break;
|
|
case COMEDI_POLL:
|
|
rc = do_poll_ioctl(dev, arg, file);
|
|
break;
|
|
case COMEDI_SETRSUBD:
|
|
rc = do_setrsubd_ioctl(dev, arg, file);
|
|
break;
|
|
case COMEDI_SETWSUBD:
|
|
rc = do_setwsubd_ioctl(dev, arg, file);
|
|
break;
|
|
default:
|
|
rc = -ENOTTY;
|
|
break;
|
|
}
|
|
|
|
done:
|
|
mutex_unlock(&dev->mutex);
|
|
return rc;
|
|
}
|
|
|
|
static void comedi_vm_open(struct vm_area_struct *area)
|
|
{
|
|
struct comedi_buf_map *bm;
|
|
|
|
bm = area->vm_private_data;
|
|
comedi_buf_map_get(bm);
|
|
}
|
|
|
|
static void comedi_vm_close(struct vm_area_struct *area)
|
|
{
|
|
struct comedi_buf_map *bm;
|
|
|
|
bm = area->vm_private_data;
|
|
comedi_buf_map_put(bm);
|
|
}
|
|
|
|
static int comedi_vm_access(struct vm_area_struct *vma, unsigned long addr,
|
|
void *buf, int len, int write)
|
|
{
|
|
struct comedi_buf_map *bm = vma->vm_private_data;
|
|
unsigned long offset =
|
|
addr - vma->vm_start + (vma->vm_pgoff << PAGE_SHIFT);
|
|
|
|
if (len < 0)
|
|
return -EINVAL;
|
|
if (len > vma->vm_end - addr)
|
|
len = vma->vm_end - addr;
|
|
return comedi_buf_map_access(bm, offset, buf, len, write);
|
|
}
|
|
|
|
static const struct vm_operations_struct comedi_vm_ops = {
|
|
.open = comedi_vm_open,
|
|
.close = comedi_vm_close,
|
|
.access = comedi_vm_access,
|
|
};
|
|
|
|
static int comedi_mmap(struct file *file, struct vm_area_struct *vma)
|
|
{
|
|
struct comedi_file *cfp = file->private_data;
|
|
struct comedi_device *dev = cfp->dev;
|
|
struct comedi_subdevice *s;
|
|
struct comedi_async *async;
|
|
struct comedi_buf_map *bm = NULL;
|
|
unsigned long start = vma->vm_start;
|
|
unsigned long size;
|
|
int n_pages;
|
|
int i;
|
|
int retval;
|
|
|
|
/*
|
|
* 'trylock' avoids circular dependency with current->mm->mmap_sem
|
|
* and down-reading &dev->attach_lock should normally succeed without
|
|
* contention unless the device is in the process of being attached
|
|
* or detached.
|
|
*/
|
|
if (!down_read_trylock(&dev->attach_lock))
|
|
return -EAGAIN;
|
|
|
|
if (!dev->attached) {
|
|
dev_dbg(dev->class_dev, "no driver attached\n");
|
|
retval = -ENODEV;
|
|
goto done;
|
|
}
|
|
|
|
if (vma->vm_flags & VM_WRITE)
|
|
s = comedi_file_write_subdevice(file);
|
|
else
|
|
s = comedi_file_read_subdevice(file);
|
|
if (!s) {
|
|
retval = -EINVAL;
|
|
goto done;
|
|
}
|
|
|
|
async = s->async;
|
|
if (!async) {
|
|
retval = -EINVAL;
|
|
goto done;
|
|
}
|
|
|
|
if (vma->vm_pgoff != 0) {
|
|
dev_dbg(dev->class_dev, "mmap() offset must be 0.\n");
|
|
retval = -EINVAL;
|
|
goto done;
|
|
}
|
|
|
|
size = vma->vm_end - vma->vm_start;
|
|
if (size > async->prealloc_bufsz) {
|
|
retval = -EFAULT;
|
|
goto done;
|
|
}
|
|
if (offset_in_page(size)) {
|
|
retval = -EFAULT;
|
|
goto done;
|
|
}
|
|
|
|
n_pages = vma_pages(vma);
|
|
|
|
/* get reference to current buf map (if any) */
|
|
bm = comedi_buf_map_from_subdev_get(s);
|
|
if (!bm || n_pages > bm->n_pages) {
|
|
retval = -EINVAL;
|
|
goto done;
|
|
}
|
|
for (i = 0; i < n_pages; ++i) {
|
|
struct comedi_buf_page *buf = &bm->page_list[i];
|
|
|
|
if (remap_pfn_range(vma, start,
|
|
page_to_pfn(virt_to_page(buf->virt_addr)),
|
|
PAGE_SIZE, PAGE_SHARED)) {
|
|
retval = -EAGAIN;
|
|
goto done;
|
|
}
|
|
start += PAGE_SIZE;
|
|
}
|
|
|
|
vma->vm_ops = &comedi_vm_ops;
|
|
vma->vm_private_data = bm;
|
|
|
|
vma->vm_ops->open(vma);
|
|
|
|
retval = 0;
|
|
done:
|
|
up_read(&dev->attach_lock);
|
|
comedi_buf_map_put(bm); /* put reference to buf map - okay if NULL */
|
|
return retval;
|
|
}
|
|
|
|
static unsigned int comedi_poll(struct file *file, poll_table *wait)
|
|
{
|
|
unsigned int mask = 0;
|
|
struct comedi_file *cfp = file->private_data;
|
|
struct comedi_device *dev = cfp->dev;
|
|
struct comedi_subdevice *s, *s_read;
|
|
|
|
down_read(&dev->attach_lock);
|
|
|
|
if (!dev->attached) {
|
|
dev_dbg(dev->class_dev, "no driver attached\n");
|
|
goto done;
|
|
}
|
|
|
|
s = comedi_file_read_subdevice(file);
|
|
s_read = s;
|
|
if (s && s->async) {
|
|
poll_wait(file, &s->async->wait_head, wait);
|
|
if (s->busy != file || !comedi_is_subdevice_running(s) ||
|
|
(s->async->cmd.flags & CMDF_WRITE) ||
|
|
comedi_buf_read_n_available(s) > 0)
|
|
mask |= POLLIN | POLLRDNORM;
|
|
}
|
|
|
|
s = comedi_file_write_subdevice(file);
|
|
if (s && s->async) {
|
|
unsigned int bps = comedi_bytes_per_sample(s);
|
|
|
|
if (s != s_read)
|
|
poll_wait(file, &s->async->wait_head, wait);
|
|
if (s->busy != file || !comedi_is_subdevice_running(s) ||
|
|
!(s->async->cmd.flags & CMDF_WRITE) ||
|
|
comedi_buf_write_n_available(s) >= bps)
|
|
mask |= POLLOUT | POLLWRNORM;
|
|
}
|
|
|
|
done:
|
|
up_read(&dev->attach_lock);
|
|
return mask;
|
|
}
|
|
|
|
static ssize_t comedi_write(struct file *file, const char __user *buf,
|
|
size_t nbytes, loff_t *offset)
|
|
{
|
|
struct comedi_subdevice *s;
|
|
struct comedi_async *async;
|
|
unsigned int n, m;
|
|
ssize_t count = 0;
|
|
int retval = 0;
|
|
DECLARE_WAITQUEUE(wait, current);
|
|
struct comedi_file *cfp = file->private_data;
|
|
struct comedi_device *dev = cfp->dev;
|
|
bool become_nonbusy = false;
|
|
bool attach_locked;
|
|
unsigned int old_detach_count;
|
|
|
|
/* Protect against device detachment during operation. */
|
|
down_read(&dev->attach_lock);
|
|
attach_locked = true;
|
|
old_detach_count = dev->detach_count;
|
|
|
|
if (!dev->attached) {
|
|
dev_dbg(dev->class_dev, "no driver attached\n");
|
|
retval = -ENODEV;
|
|
goto out;
|
|
}
|
|
|
|
s = comedi_file_write_subdevice(file);
|
|
if (!s || !s->async) {
|
|
retval = -EIO;
|
|
goto out;
|
|
}
|
|
|
|
async = s->async;
|
|
if (s->busy != file || !(async->cmd.flags & CMDF_WRITE)) {
|
|
retval = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
add_wait_queue(&async->wait_head, &wait);
|
|
while (count == 0 && !retval) {
|
|
unsigned int runflags;
|
|
unsigned int wp, n1, n2;
|
|
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
|
|
runflags = comedi_get_subdevice_runflags(s);
|
|
if (!comedi_is_runflags_running(runflags)) {
|
|
if (comedi_is_runflags_in_error(runflags))
|
|
retval = -EPIPE;
|
|
if (retval || nbytes)
|
|
become_nonbusy = true;
|
|
break;
|
|
}
|
|
if (nbytes == 0)
|
|
break;
|
|
|
|
/* Allocate all free buffer space. */
|
|
comedi_buf_write_alloc(s, async->prealloc_bufsz);
|
|
m = comedi_buf_write_n_allocated(s);
|
|
n = min_t(size_t, m, nbytes);
|
|
|
|
if (n == 0) {
|
|
if (file->f_flags & O_NONBLOCK) {
|
|
retval = -EAGAIN;
|
|
break;
|
|
}
|
|
schedule();
|
|
if (signal_pending(current)) {
|
|
retval = -ERESTARTSYS;
|
|
break;
|
|
}
|
|
if (s->busy != file ||
|
|
!(async->cmd.flags & CMDF_WRITE)) {
|
|
retval = -EINVAL;
|
|
break;
|
|
}
|
|
continue;
|
|
}
|
|
|
|
wp = async->buf_write_ptr;
|
|
n1 = min(n, async->prealloc_bufsz - wp);
|
|
n2 = n - n1;
|
|
m = copy_from_user(async->prealloc_buf + wp, buf, n1);
|
|
if (m)
|
|
m += n2;
|
|
else if (n2)
|
|
m = copy_from_user(async->prealloc_buf, buf + n1, n2);
|
|
if (m) {
|
|
n -= m;
|
|
retval = -EFAULT;
|
|
}
|
|
comedi_buf_write_free(s, n);
|
|
|
|
count += n;
|
|
nbytes -= n;
|
|
|
|
buf += n;
|
|
}
|
|
remove_wait_queue(&async->wait_head, &wait);
|
|
set_current_state(TASK_RUNNING);
|
|
if (become_nonbusy && count == 0) {
|
|
struct comedi_subdevice *new_s;
|
|
|
|
/*
|
|
* To avoid deadlock, cannot acquire dev->mutex
|
|
* while dev->attach_lock is held.
|
|
*/
|
|
up_read(&dev->attach_lock);
|
|
attach_locked = false;
|
|
mutex_lock(&dev->mutex);
|
|
/*
|
|
* Check device hasn't become detached behind our back.
|
|
* Checking dev->detach_count is unchanged ought to be
|
|
* sufficient (unless there have been 2**32 detaches in the
|
|
* meantime!), but check the subdevice pointer as well just in
|
|
* case.
|
|
*
|
|
* Also check the subdevice is still in a suitable state to
|
|
* become non-busy in case it changed behind our back.
|
|
*/
|
|
new_s = comedi_file_write_subdevice(file);
|
|
if (dev->attached && old_detach_count == dev->detach_count &&
|
|
s == new_s && new_s->async == async && s->busy == file &&
|
|
(async->cmd.flags & CMDF_WRITE) &&
|
|
!comedi_is_subdevice_running(s))
|
|
do_become_nonbusy(dev, s);
|
|
mutex_unlock(&dev->mutex);
|
|
}
|
|
out:
|
|
if (attach_locked)
|
|
up_read(&dev->attach_lock);
|
|
|
|
return count ? count : retval;
|
|
}
|
|
|
|
static ssize_t comedi_read(struct file *file, char __user *buf, size_t nbytes,
|
|
loff_t *offset)
|
|
{
|
|
struct comedi_subdevice *s;
|
|
struct comedi_async *async;
|
|
unsigned int n, m;
|
|
ssize_t count = 0;
|
|
int retval = 0;
|
|
DECLARE_WAITQUEUE(wait, current);
|
|
struct comedi_file *cfp = file->private_data;
|
|
struct comedi_device *dev = cfp->dev;
|
|
unsigned int old_detach_count;
|
|
bool become_nonbusy = false;
|
|
bool attach_locked;
|
|
|
|
/* Protect against device detachment during operation. */
|
|
down_read(&dev->attach_lock);
|
|
attach_locked = true;
|
|
old_detach_count = dev->detach_count;
|
|
|
|
if (!dev->attached) {
|
|
dev_dbg(dev->class_dev, "no driver attached\n");
|
|
retval = -ENODEV;
|
|
goto out;
|
|
}
|
|
|
|
s = comedi_file_read_subdevice(file);
|
|
if (!s || !s->async) {
|
|
retval = -EIO;
|
|
goto out;
|
|
}
|
|
|
|
async = s->async;
|
|
if (s->busy != file || (async->cmd.flags & CMDF_WRITE)) {
|
|
retval = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
add_wait_queue(&async->wait_head, &wait);
|
|
while (count == 0 && !retval) {
|
|
unsigned int rp, n1, n2;
|
|
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
|
|
m = comedi_buf_read_n_available(s);
|
|
n = min_t(size_t, m, nbytes);
|
|
|
|
if (n == 0) {
|
|
unsigned int runflags =
|
|
comedi_get_subdevice_runflags(s);
|
|
|
|
if (!comedi_is_runflags_running(runflags)) {
|
|
if (comedi_is_runflags_in_error(runflags))
|
|
retval = -EPIPE;
|
|
if (retval || nbytes)
|
|
become_nonbusy = true;
|
|
break;
|
|
}
|
|
if (nbytes == 0)
|
|
break;
|
|
if (file->f_flags & O_NONBLOCK) {
|
|
retval = -EAGAIN;
|
|
break;
|
|
}
|
|
schedule();
|
|
if (signal_pending(current)) {
|
|
retval = -ERESTARTSYS;
|
|
break;
|
|
}
|
|
if (s->busy != file ||
|
|
(async->cmd.flags & CMDF_WRITE)) {
|
|
retval = -EINVAL;
|
|
break;
|
|
}
|
|
continue;
|
|
}
|
|
rp = async->buf_read_ptr;
|
|
n1 = min(n, async->prealloc_bufsz - rp);
|
|
n2 = n - n1;
|
|
m = copy_to_user(buf, async->prealloc_buf + rp, n1);
|
|
if (m)
|
|
m += n2;
|
|
else if (n2)
|
|
m = copy_to_user(buf + n1, async->prealloc_buf, n2);
|
|
if (m) {
|
|
n -= m;
|
|
retval = -EFAULT;
|
|
}
|
|
|
|
comedi_buf_read_alloc(s, n);
|
|
comedi_buf_read_free(s, n);
|
|
|
|
count += n;
|
|
nbytes -= n;
|
|
|
|
buf += n;
|
|
}
|
|
remove_wait_queue(&async->wait_head, &wait);
|
|
set_current_state(TASK_RUNNING);
|
|
if (become_nonbusy && count == 0) {
|
|
struct comedi_subdevice *new_s;
|
|
|
|
/*
|
|
* To avoid deadlock, cannot acquire dev->mutex
|
|
* while dev->attach_lock is held.
|
|
*/
|
|
up_read(&dev->attach_lock);
|
|
attach_locked = false;
|
|
mutex_lock(&dev->mutex);
|
|
/*
|
|
* Check device hasn't become detached behind our back.
|
|
* Checking dev->detach_count is unchanged ought to be
|
|
* sufficient (unless there have been 2**32 detaches in the
|
|
* meantime!), but check the subdevice pointer as well just in
|
|
* case.
|
|
*
|
|
* Also check the subdevice is still in a suitable state to
|
|
* become non-busy in case it changed behind our back.
|
|
*/
|
|
new_s = comedi_file_read_subdevice(file);
|
|
if (dev->attached && old_detach_count == dev->detach_count &&
|
|
s == new_s && new_s->async == async && s->busy == file &&
|
|
!(async->cmd.flags & CMDF_WRITE) &&
|
|
!comedi_is_subdevice_running(s) &&
|
|
comedi_buf_read_n_available(s) == 0)
|
|
do_become_nonbusy(dev, s);
|
|
mutex_unlock(&dev->mutex);
|
|
}
|
|
out:
|
|
if (attach_locked)
|
|
up_read(&dev->attach_lock);
|
|
|
|
return count ? count : retval;
|
|
}
|
|
|
|
static int comedi_open(struct inode *inode, struct file *file)
|
|
{
|
|
const unsigned int minor = iminor(inode);
|
|
struct comedi_file *cfp;
|
|
struct comedi_device *dev = comedi_dev_get_from_minor(minor);
|
|
int rc;
|
|
|
|
if (!dev) {
|
|
pr_debug("invalid minor number\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
cfp = kzalloc(sizeof(*cfp), GFP_KERNEL);
|
|
if (!cfp)
|
|
return -ENOMEM;
|
|
|
|
cfp->dev = dev;
|
|
|
|
mutex_lock(&dev->mutex);
|
|
if (!dev->attached && !capable(CAP_SYS_ADMIN)) {
|
|
dev_dbg(dev->class_dev, "not attached and not CAP_SYS_ADMIN\n");
|
|
rc = -ENODEV;
|
|
goto out;
|
|
}
|
|
if (dev->attached && dev->use_count == 0) {
|
|
if (!try_module_get(dev->driver->module)) {
|
|
rc = -ENXIO;
|
|
goto out;
|
|
}
|
|
if (dev->open) {
|
|
rc = dev->open(dev);
|
|
if (rc < 0) {
|
|
module_put(dev->driver->module);
|
|
goto out;
|
|
}
|
|
}
|
|
}
|
|
|
|
dev->use_count++;
|
|
file->private_data = cfp;
|
|
comedi_file_reset(file);
|
|
rc = 0;
|
|
|
|
out:
|
|
mutex_unlock(&dev->mutex);
|
|
if (rc) {
|
|
comedi_dev_put(dev);
|
|
kfree(cfp);
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
static int comedi_fasync(int fd, struct file *file, int on)
|
|
{
|
|
struct comedi_file *cfp = file->private_data;
|
|
struct comedi_device *dev = cfp->dev;
|
|
|
|
return fasync_helper(fd, file, on, &dev->async_queue);
|
|
}
|
|
|
|
static int comedi_close(struct inode *inode, struct file *file)
|
|
{
|
|
struct comedi_file *cfp = file->private_data;
|
|
struct comedi_device *dev = cfp->dev;
|
|
struct comedi_subdevice *s = NULL;
|
|
int i;
|
|
|
|
mutex_lock(&dev->mutex);
|
|
|
|
if (dev->subdevices) {
|
|
for (i = 0; i < dev->n_subdevices; i++) {
|
|
s = &dev->subdevices[i];
|
|
|
|
if (s->busy == file)
|
|
do_cancel(dev, s);
|
|
if (s->lock == file)
|
|
s->lock = NULL;
|
|
}
|
|
}
|
|
if (dev->attached && dev->use_count == 1) {
|
|
if (dev->close)
|
|
dev->close(dev);
|
|
module_put(dev->driver->module);
|
|
}
|
|
|
|
dev->use_count--;
|
|
|
|
mutex_unlock(&dev->mutex);
|
|
comedi_dev_put(dev);
|
|
kfree(cfp);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct file_operations comedi_fops = {
|
|
.owner = THIS_MODULE,
|
|
.unlocked_ioctl = comedi_unlocked_ioctl,
|
|
.compat_ioctl = comedi_compat_ioctl,
|
|
.open = comedi_open,
|
|
.release = comedi_close,
|
|
.read = comedi_read,
|
|
.write = comedi_write,
|
|
.mmap = comedi_mmap,
|
|
.poll = comedi_poll,
|
|
.fasync = comedi_fasync,
|
|
.llseek = noop_llseek,
|
|
};
|
|
|
|
/**
|
|
* comedi_event() - Handle events for asynchronous COMEDI command
|
|
* @dev: COMEDI device.
|
|
* @s: COMEDI subdevice.
|
|
* Context: in_interrupt() (usually), @s->spin_lock spin-lock not held.
|
|
*
|
|
* If an asynchronous COMEDI command is active on the subdevice, process
|
|
* any %COMEDI_CB_... event flags that have been set, usually by an
|
|
* interrupt handler. These may change the run state of the asynchronous
|
|
* command, wake a task, and/or send a %SIGIO signal.
|
|
*/
|
|
void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s)
|
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{
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struct comedi_async *async = s->async;
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unsigned int events;
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int si_code = 0;
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unsigned long flags;
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spin_lock_irqsave(&s->spin_lock, flags);
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events = async->events;
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async->events = 0;
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if (!__comedi_is_subdevice_running(s)) {
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spin_unlock_irqrestore(&s->spin_lock, flags);
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return;
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}
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if (events & COMEDI_CB_CANCEL_MASK)
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__comedi_clear_subdevice_runflags(s, COMEDI_SRF_RUNNING);
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/*
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* Remember if an error event has occurred, so an error can be
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* returned the next time the user does a read() or write().
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*/
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if (events & COMEDI_CB_ERROR_MASK)
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__comedi_set_subdevice_runflags(s, COMEDI_SRF_ERROR);
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if (async->cb_mask & events) {
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wake_up_interruptible(&async->wait_head);
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si_code = async->cmd.flags & CMDF_WRITE ? POLL_OUT : POLL_IN;
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}
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spin_unlock_irqrestore(&s->spin_lock, flags);
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if (si_code)
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kill_fasync(&dev->async_queue, SIGIO, si_code);
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}
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EXPORT_SYMBOL_GPL(comedi_event);
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/* Note: the ->mutex is pre-locked on successful return */
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struct comedi_device *comedi_alloc_board_minor(struct device *hardware_device)
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{
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struct comedi_device *dev;
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struct device *csdev;
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unsigned int i;
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dev = kzalloc(sizeof(*dev), GFP_KERNEL);
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if (!dev)
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return ERR_PTR(-ENOMEM);
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comedi_device_init(dev);
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comedi_set_hw_dev(dev, hardware_device);
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mutex_lock(&dev->mutex);
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mutex_lock(&comedi_board_minor_table_lock);
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for (i = hardware_device ? comedi_num_legacy_minors : 0;
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i < COMEDI_NUM_BOARD_MINORS; ++i) {
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if (!comedi_board_minor_table[i]) {
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comedi_board_minor_table[i] = dev;
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break;
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}
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}
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mutex_unlock(&comedi_board_minor_table_lock);
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if (i == COMEDI_NUM_BOARD_MINORS) {
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mutex_unlock(&dev->mutex);
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comedi_device_cleanup(dev);
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comedi_dev_put(dev);
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dev_err(hardware_device,
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"ran out of minor numbers for board device files\n");
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return ERR_PTR(-EBUSY);
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}
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dev->minor = i;
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csdev = device_create(comedi_class, hardware_device,
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MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i", i);
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if (!IS_ERR(csdev))
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dev->class_dev = get_device(csdev);
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/* Note: dev->mutex needs to be unlocked by the caller. */
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return dev;
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}
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void comedi_release_hardware_device(struct device *hardware_device)
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{
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int minor;
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struct comedi_device *dev;
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for (minor = comedi_num_legacy_minors; minor < COMEDI_NUM_BOARD_MINORS;
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minor++) {
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mutex_lock(&comedi_board_minor_table_lock);
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dev = comedi_board_minor_table[minor];
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if (dev && dev->hw_dev == hardware_device) {
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comedi_board_minor_table[minor] = NULL;
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mutex_unlock(&comedi_board_minor_table_lock);
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comedi_free_board_dev(dev);
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break;
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}
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mutex_unlock(&comedi_board_minor_table_lock);
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}
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|
}
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|
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int comedi_alloc_subdevice_minor(struct comedi_subdevice *s)
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{
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|
struct comedi_device *dev = s->device;
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|
struct device *csdev;
|
|
unsigned int i;
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|
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mutex_lock(&comedi_subdevice_minor_table_lock);
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for (i = 0; i < COMEDI_NUM_SUBDEVICE_MINORS; ++i) {
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if (!comedi_subdevice_minor_table[i]) {
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comedi_subdevice_minor_table[i] = s;
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|
break;
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|
}
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|
}
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|
mutex_unlock(&comedi_subdevice_minor_table_lock);
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|
if (i == COMEDI_NUM_SUBDEVICE_MINORS) {
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|
dev_err(dev->class_dev,
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"ran out of minor numbers for subdevice files\n");
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|
return -EBUSY;
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|
}
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|
i += COMEDI_NUM_BOARD_MINORS;
|
|
s->minor = i;
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|
csdev = device_create(comedi_class, dev->class_dev,
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MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i_subd%i",
|
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dev->minor, s->index);
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|
if (!IS_ERR(csdev))
|
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s->class_dev = csdev;
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|
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|
return 0;
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|
}
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|
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|
void comedi_free_subdevice_minor(struct comedi_subdevice *s)
|
|
{
|
|
unsigned int i;
|
|
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|
if (!s)
|
|
return;
|
|
if (s->minor < COMEDI_NUM_BOARD_MINORS ||
|
|
s->minor >= COMEDI_NUM_MINORS)
|
|
return;
|
|
|
|
i = s->minor - COMEDI_NUM_BOARD_MINORS;
|
|
mutex_lock(&comedi_subdevice_minor_table_lock);
|
|
if (s == comedi_subdevice_minor_table[i])
|
|
comedi_subdevice_minor_table[i] = NULL;
|
|
mutex_unlock(&comedi_subdevice_minor_table_lock);
|
|
if (s->class_dev) {
|
|
device_destroy(comedi_class, MKDEV(COMEDI_MAJOR, s->minor));
|
|
s->class_dev = NULL;
|
|
}
|
|
}
|
|
|
|
static void comedi_cleanup_board_minors(void)
|
|
{
|
|
struct comedi_device *dev;
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < COMEDI_NUM_BOARD_MINORS; i++) {
|
|
dev = comedi_clear_board_minor(i);
|
|
comedi_free_board_dev(dev);
|
|
}
|
|
}
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|
|
|
static int __init comedi_init(void)
|
|
{
|
|
int i;
|
|
int retval;
|
|
|
|
pr_info("version " COMEDI_RELEASE " - http://www.comedi.org\n");
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|
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if (comedi_num_legacy_minors > COMEDI_NUM_BOARD_MINORS) {
|
|
pr_err("invalid value for module parameter \"comedi_num_legacy_minors\". Valid values are 0 through %i.\n",
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|
COMEDI_NUM_BOARD_MINORS);
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|
return -EINVAL;
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|
}
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retval = register_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
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COMEDI_NUM_MINORS, "comedi");
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if (retval)
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return retval;
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cdev_init(&comedi_cdev, &comedi_fops);
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comedi_cdev.owner = THIS_MODULE;
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|
retval = kobject_set_name(&comedi_cdev.kobj, "comedi");
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if (retval)
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goto out_unregister_chrdev_region;
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retval = cdev_add(&comedi_cdev, MKDEV(COMEDI_MAJOR, 0),
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COMEDI_NUM_MINORS);
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if (retval)
|
|
goto out_unregister_chrdev_region;
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|
|
|
comedi_class = class_create(THIS_MODULE, "comedi");
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|
if (IS_ERR(comedi_class)) {
|
|
retval = PTR_ERR(comedi_class);
|
|
pr_err("failed to create class\n");
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|
goto out_cdev_del;
|
|
}
|
|
|
|
comedi_class->dev_groups = comedi_dev_groups;
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|
|
|
/* create devices files for legacy/manual use */
|
|
for (i = 0; i < comedi_num_legacy_minors; i++) {
|
|
struct comedi_device *dev;
|
|
|
|
dev = comedi_alloc_board_minor(NULL);
|
|
if (IS_ERR(dev)) {
|
|
retval = PTR_ERR(dev);
|
|
goto out_cleanup_board_minors;
|
|
}
|
|
/* comedi_alloc_board_minor() locked the mutex */
|
|
mutex_unlock(&dev->mutex);
|
|
}
|
|
|
|
/* XXX requires /proc interface */
|
|
comedi_proc_init();
|
|
|
|
return 0;
|
|
|
|
out_cleanup_board_minors:
|
|
comedi_cleanup_board_minors();
|
|
class_destroy(comedi_class);
|
|
out_cdev_del:
|
|
cdev_del(&comedi_cdev);
|
|
out_unregister_chrdev_region:
|
|
unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS);
|
|
return retval;
|
|
}
|
|
module_init(comedi_init);
|
|
|
|
static void __exit comedi_cleanup(void)
|
|
{
|
|
comedi_cleanup_board_minors();
|
|
class_destroy(comedi_class);
|
|
cdev_del(&comedi_cdev);
|
|
unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS);
|
|
|
|
comedi_proc_cleanup();
|
|
}
|
|
module_exit(comedi_cleanup);
|
|
|
|
MODULE_AUTHOR("http://www.comedi.org");
|
|
MODULE_DESCRIPTION("Comedi core module");
|
|
MODULE_LICENSE("GPL");
|