955 lines
24 KiB
C
955 lines
24 KiB
C
/*
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module/drivers.c
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functions for manipulating drivers
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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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Copyright (C) 2002 Frank Mori Hess <fmhess@users.sourceforge.net>
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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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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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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/kconfig.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/fcntl.h>
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#include <linux/ioport.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/highmem.h> /* for SuSE brokenness */
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#include <linux/vmalloc.h>
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#include <linux/cdev.h>
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#include <linux/dma-mapping.h>
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#include <linux/io.h>
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#include <linux/interrupt.h>
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#include <linux/firmware.h>
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#include "comedidev.h"
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#include "comedi_internal.h"
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struct comedi_driver *comedi_drivers;
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/* protects access to comedi_drivers */
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DEFINE_MUTEX(comedi_drivers_list_lock);
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int comedi_set_hw_dev(struct comedi_device *dev, struct device *hw_dev)
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{
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if (hw_dev == dev->hw_dev)
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return 0;
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if (dev->hw_dev != NULL)
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return -EEXIST;
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dev->hw_dev = get_device(hw_dev);
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return 0;
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}
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EXPORT_SYMBOL_GPL(comedi_set_hw_dev);
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static void comedi_clear_hw_dev(struct comedi_device *dev)
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{
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put_device(dev->hw_dev);
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dev->hw_dev = NULL;
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}
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/**
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* comedi_alloc_devpriv() - Allocate memory for the device private data.
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* @dev: comedi_device struct
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* @size: size of the memory to allocate
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*/
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void *comedi_alloc_devpriv(struct comedi_device *dev, size_t size)
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{
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dev->private = kzalloc(size, GFP_KERNEL);
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return dev->private;
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}
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EXPORT_SYMBOL_GPL(comedi_alloc_devpriv);
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int comedi_alloc_subdevices(struct comedi_device *dev, int num_subdevices)
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{
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struct comedi_subdevice *s;
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int i;
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if (num_subdevices < 1)
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return -EINVAL;
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s = kcalloc(num_subdevices, sizeof(*s), GFP_KERNEL);
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if (!s)
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return -ENOMEM;
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dev->subdevices = s;
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dev->n_subdevices = num_subdevices;
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for (i = 0; i < num_subdevices; ++i) {
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s = &dev->subdevices[i];
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s->device = dev;
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s->index = i;
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s->async_dma_dir = DMA_NONE;
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spin_lock_init(&s->spin_lock);
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s->minor = -1;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(comedi_alloc_subdevices);
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/**
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* comedi_alloc_subdev_readback() - Allocate memory for the subdevice readback.
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* @s: comedi_subdevice struct
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*/
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int comedi_alloc_subdev_readback(struct comedi_subdevice *s)
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{
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if (!s->n_chan)
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return -EINVAL;
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s->readback = kcalloc(s->n_chan, sizeof(*s->readback), GFP_KERNEL);
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if (!s->readback)
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return -ENOMEM;
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if (!s->insn_read)
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s->insn_read = comedi_readback_insn_read;
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return 0;
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}
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EXPORT_SYMBOL_GPL(comedi_alloc_subdev_readback);
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static void comedi_device_detach_cleanup(struct comedi_device *dev)
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{
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int i;
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struct comedi_subdevice *s;
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if (dev->subdevices) {
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for (i = 0; i < dev->n_subdevices; i++) {
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s = &dev->subdevices[i];
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if (s->runflags & COMEDI_SRF_FREE_SPRIV)
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kfree(s->private);
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comedi_free_subdevice_minor(s);
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if (s->async) {
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comedi_buf_alloc(dev, s, 0);
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kfree(s->async);
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}
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kfree(s->readback);
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}
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kfree(dev->subdevices);
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dev->subdevices = NULL;
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dev->n_subdevices = 0;
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}
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kfree(dev->private);
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dev->private = NULL;
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dev->driver = NULL;
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dev->board_name = NULL;
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dev->board_ptr = NULL;
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dev->mmio = NULL;
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dev->iobase = 0;
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dev->iolen = 0;
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dev->ioenabled = false;
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dev->irq = 0;
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dev->read_subdev = NULL;
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dev->write_subdev = NULL;
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dev->open = NULL;
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dev->close = NULL;
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comedi_clear_hw_dev(dev);
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}
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void comedi_device_detach(struct comedi_device *dev)
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{
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comedi_device_cancel_all(dev);
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down_write(&dev->attach_lock);
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dev->attached = false;
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dev->detach_count++;
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if (dev->driver)
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dev->driver->detach(dev);
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comedi_device_detach_cleanup(dev);
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up_write(&dev->attach_lock);
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}
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static int poll_invalid(struct comedi_device *dev, struct comedi_subdevice *s)
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{
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return -EINVAL;
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}
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int insn_inval(struct comedi_device *dev, struct comedi_subdevice *s,
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struct comedi_insn *insn, unsigned int *data)
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{
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return -EINVAL;
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}
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/**
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* comedi_readback_insn_read() - A generic (*insn_read) for subdevice readback.
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* @dev: comedi_device struct
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* @s: comedi_subdevice struct
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* @insn: comedi_insn struct
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* @data: pointer to return the readback data
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*/
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int comedi_readback_insn_read(struct comedi_device *dev,
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struct comedi_subdevice *s,
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struct comedi_insn *insn,
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unsigned int *data)
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{
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unsigned int chan = CR_CHAN(insn->chanspec);
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int i;
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if (!s->readback)
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return -EINVAL;
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for (i = 0; i < insn->n; i++)
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data[i] = s->readback[chan];
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return insn->n;
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}
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EXPORT_SYMBOL_GPL(comedi_readback_insn_read);
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/**
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* comedi_timeout() - busy-wait for a driver condition to occur.
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* @dev: comedi_device struct
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* @s: comedi_subdevice struct
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* @insn: comedi_insn struct
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* @cb: callback to check for the condition
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* @context: private context from the driver
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*/
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int comedi_timeout(struct comedi_device *dev,
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struct comedi_subdevice *s,
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struct comedi_insn *insn,
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int (*cb)(struct comedi_device *dev,
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struct comedi_subdevice *s,
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struct comedi_insn *insn,
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unsigned long context),
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unsigned long context)
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{
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unsigned long timeout = jiffies + msecs_to_jiffies(COMEDI_TIMEOUT_MS);
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int ret;
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while (time_before(jiffies, timeout)) {
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ret = cb(dev, s, insn, context);
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if (ret != -EBUSY)
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return ret; /* success (0) or non EBUSY errno */
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cpu_relax();
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}
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return -ETIMEDOUT;
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}
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EXPORT_SYMBOL_GPL(comedi_timeout);
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/**
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* comedi_dio_insn_config() - boilerplate (*insn_config) for DIO subdevices.
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* @dev: comedi_device struct
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* @s: comedi_subdevice struct
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* @insn: comedi_insn struct
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* @data: parameters for the @insn
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* @mask: io_bits mask for grouped channels
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*/
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int comedi_dio_insn_config(struct comedi_device *dev,
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struct comedi_subdevice *s,
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struct comedi_insn *insn,
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unsigned int *data,
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unsigned int mask)
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{
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unsigned int chan_mask = 1 << CR_CHAN(insn->chanspec);
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if (!mask)
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mask = chan_mask;
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switch (data[0]) {
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case INSN_CONFIG_DIO_INPUT:
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s->io_bits &= ~mask;
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break;
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case INSN_CONFIG_DIO_OUTPUT:
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s->io_bits |= mask;
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break;
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case INSN_CONFIG_DIO_QUERY:
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data[1] = (s->io_bits & mask) ? COMEDI_OUTPUT : COMEDI_INPUT;
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return insn->n;
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default:
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return -EINVAL;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(comedi_dio_insn_config);
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/**
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* comedi_dio_update_state() - update the internal state of DIO subdevices.
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* @s: comedi_subdevice struct
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* @data: the channel mask and bits to update
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*/
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unsigned int comedi_dio_update_state(struct comedi_subdevice *s,
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unsigned int *data)
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{
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unsigned int chanmask = (s->n_chan < 32) ? ((1 << s->n_chan) - 1)
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: 0xffffffff;
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unsigned int mask = data[0] & chanmask;
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unsigned int bits = data[1];
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if (mask) {
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s->state &= ~mask;
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s->state |= (bits & mask);
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}
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return mask;
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}
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EXPORT_SYMBOL_GPL(comedi_dio_update_state);
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/**
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* comedi_bytes_per_scan - get length of asynchronous command "scan" in bytes
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* @s: comedi_subdevice struct
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*
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* Determines the overall scan length according to the subdevice type and the
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* number of channels in the scan.
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*
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* For digital input, output or input/output subdevices, samples for multiple
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* channels are assumed to be packed into one or more unsigned short or
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* unsigned int values according to the subdevice's SDF_LSAMPL flag. For other
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* types of subdevice, samples are assumed to occupy a whole unsigned short or
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* unsigned int according to the SDF_LSAMPL flag.
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*
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* Returns the overall scan length in bytes.
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*/
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unsigned int comedi_bytes_per_scan(struct comedi_subdevice *s)
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{
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struct comedi_cmd *cmd = &s->async->cmd;
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unsigned int num_samples;
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unsigned int bits_per_sample;
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switch (s->type) {
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case COMEDI_SUBD_DI:
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case COMEDI_SUBD_DO:
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case COMEDI_SUBD_DIO:
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bits_per_sample = 8 * comedi_bytes_per_sample(s);
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num_samples = DIV_ROUND_UP(cmd->scan_end_arg, bits_per_sample);
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break;
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default:
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num_samples = cmd->scan_end_arg;
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break;
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}
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return comedi_samples_to_bytes(s, num_samples);
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}
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EXPORT_SYMBOL_GPL(comedi_bytes_per_scan);
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/**
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* comedi_nscans_left - return the number of scans left in the command
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* @s: comedi_subdevice struct
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* @nscans: the expected number of scans
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*
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* If nscans is 0, the number of scans available in the async buffer will be
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* used. Otherwise the expected number of scans will be used.
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*
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* If the async command has a stop_src of TRIG_COUNT, the nscans will be
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* checked against the number of scans left in the command.
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*
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* The return value will then be either the expected number of scans or the
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* number of scans remaining in the command.
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*/
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unsigned int comedi_nscans_left(struct comedi_subdevice *s,
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unsigned int nscans)
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{
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struct comedi_async *async = s->async;
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struct comedi_cmd *cmd = &async->cmd;
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if (nscans == 0) {
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unsigned int nbytes = comedi_buf_read_n_available(s);
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nscans = nbytes / comedi_bytes_per_scan(s);
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}
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if (cmd->stop_src == TRIG_COUNT) {
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unsigned int scans_left = 0;
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if (async->scans_done < cmd->stop_arg)
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scans_left = cmd->stop_arg - async->scans_done;
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if (nscans > scans_left)
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nscans = scans_left;
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}
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return nscans;
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}
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EXPORT_SYMBOL_GPL(comedi_nscans_left);
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/**
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* comedi_nsamples_left - return the number of samples left in the command
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* @s: comedi_subdevice struct
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* @nsamples: the expected number of samples
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*
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* Returns the expected number of samples of the number of samples remaining
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* in the command.
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*/
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unsigned int comedi_nsamples_left(struct comedi_subdevice *s,
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unsigned int nsamples)
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{
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struct comedi_async *async = s->async;
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struct comedi_cmd *cmd = &async->cmd;
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if (cmd->stop_src == TRIG_COUNT) {
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/* +1 to force comedi_nscans_left() to return the scans left */
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unsigned int nscans = (nsamples / cmd->scan_end_arg) + 1;
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unsigned int scans_left = comedi_nscans_left(s, nscans);
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unsigned int scan_pos =
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comedi_bytes_to_samples(s, async->scan_progress);
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unsigned long long samples_left = 0;
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if (scans_left) {
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samples_left = ((unsigned long long)scans_left *
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cmd->scan_end_arg) - scan_pos;
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}
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if (samples_left < nsamples)
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nsamples = samples_left;
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}
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return nsamples;
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}
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EXPORT_SYMBOL_GPL(comedi_nsamples_left);
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/**
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* comedi_inc_scan_progress - update scan progress in asynchronous command
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* @s: comedi_subdevice struct
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* @num_bytes: amount of data in bytes to increment scan progress
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*
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* Increments the scan progress by the number of bytes specified by num_bytes.
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* If the scan progress reaches or exceeds the scan length in bytes, reduce
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* it modulo the scan length in bytes and set the "end of scan" asynchronous
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* event flag to be processed later.
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*/
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void comedi_inc_scan_progress(struct comedi_subdevice *s,
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unsigned int num_bytes)
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{
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struct comedi_async *async = s->async;
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struct comedi_cmd *cmd = &async->cmd;
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unsigned int scan_length = comedi_bytes_per_scan(s);
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/* track the 'cur_chan' for non-SDF_PACKED subdevices */
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if (!(s->subdev_flags & SDF_PACKED)) {
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async->cur_chan += comedi_bytes_to_samples(s, num_bytes);
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async->cur_chan %= cmd->chanlist_len;
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}
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async->scan_progress += num_bytes;
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if (async->scan_progress >= scan_length) {
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unsigned int nscans = async->scan_progress / scan_length;
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if (async->scans_done < (UINT_MAX - nscans))
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async->scans_done += nscans;
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else
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async->scans_done = UINT_MAX;
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async->scan_progress %= scan_length;
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async->events |= COMEDI_CB_EOS;
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}
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}
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EXPORT_SYMBOL_GPL(comedi_inc_scan_progress);
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/**
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* comedi_handle_events - handle events and possibly stop acquisition
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* @dev: comedi_device struct
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* @s: comedi_subdevice struct
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*
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* Handles outstanding asynchronous acquisition event flags associated
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* with the subdevice. Call the subdevice's "->cancel()" handler if the
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* "end of acquisition", "error" or "overflow" event flags are set in order
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* to stop the acquisition at the driver level.
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*
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* Calls comedi_event() to further process the event flags, which may mark
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* the asynchronous command as no longer running, possibly terminated with
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* an error, and may wake up tasks.
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*
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* Return a bit-mask of the handled events.
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*/
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unsigned int comedi_handle_events(struct comedi_device *dev,
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struct comedi_subdevice *s)
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{
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unsigned int events = s->async->events;
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if (events == 0)
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return events;
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if (events & COMEDI_CB_CANCEL_MASK)
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s->cancel(dev, s);
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comedi_event(dev, s);
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return events;
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}
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EXPORT_SYMBOL_GPL(comedi_handle_events);
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static int insn_rw_emulate_bits(struct comedi_device *dev,
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struct comedi_subdevice *s,
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struct comedi_insn *insn, unsigned int *data)
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{
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struct comedi_insn new_insn;
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int ret;
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static const unsigned channels_per_bitfield = 32;
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unsigned chan = CR_CHAN(insn->chanspec);
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const unsigned base_bitfield_channel =
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(chan < channels_per_bitfield) ? 0 : chan;
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unsigned int new_data[2];
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memset(new_data, 0, sizeof(new_data));
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memset(&new_insn, 0, sizeof(new_insn));
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new_insn.insn = INSN_BITS;
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new_insn.chanspec = base_bitfield_channel;
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new_insn.n = 2;
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new_insn.subdev = insn->subdev;
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if (insn->insn == INSN_WRITE) {
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if (!(s->subdev_flags & SDF_WRITABLE))
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return -EINVAL;
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new_data[0] = 1 << (chan - base_bitfield_channel); /* mask */
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new_data[1] = data[0] ? (1 << (chan - base_bitfield_channel))
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: 0; /* bits */
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}
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ret = s->insn_bits(dev, s, &new_insn, new_data);
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if (ret < 0)
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return ret;
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if (insn->insn == INSN_READ)
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data[0] = (new_data[1] >> (chan - base_bitfield_channel)) & 1;
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return 1;
|
|
}
|
|
|
|
static int __comedi_device_postconfig_async(struct comedi_device *dev,
|
|
struct comedi_subdevice *s)
|
|
{
|
|
struct comedi_async *async;
|
|
unsigned int buf_size;
|
|
int ret;
|
|
|
|
if ((s->subdev_flags & (SDF_CMD_READ | SDF_CMD_WRITE)) == 0) {
|
|
dev_warn(dev->class_dev,
|
|
"async subdevices must support SDF_CMD_READ or SDF_CMD_WRITE\n");
|
|
return -EINVAL;
|
|
}
|
|
if (!s->do_cmdtest) {
|
|
dev_warn(dev->class_dev,
|
|
"async subdevices must have a do_cmdtest() function\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
async = kzalloc(sizeof(*async), GFP_KERNEL);
|
|
if (!async)
|
|
return -ENOMEM;
|
|
|
|
init_waitqueue_head(&async->wait_head);
|
|
s->async = async;
|
|
|
|
async->max_bufsize = comedi_default_buf_maxsize_kb * 1024;
|
|
buf_size = comedi_default_buf_size_kb * 1024;
|
|
if (buf_size > async->max_bufsize)
|
|
buf_size = async->max_bufsize;
|
|
|
|
if (comedi_buf_alloc(dev, s, buf_size) < 0) {
|
|
dev_warn(dev->class_dev, "Buffer allocation failed\n");
|
|
return -ENOMEM;
|
|
}
|
|
if (s->buf_change) {
|
|
ret = s->buf_change(dev, s);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
comedi_alloc_subdevice_minor(s);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __comedi_device_postconfig(struct comedi_device *dev)
|
|
{
|
|
struct comedi_subdevice *s;
|
|
int ret;
|
|
int i;
|
|
|
|
for (i = 0; i < dev->n_subdevices; i++) {
|
|
s = &dev->subdevices[i];
|
|
|
|
if (s->type == COMEDI_SUBD_UNUSED)
|
|
continue;
|
|
|
|
if (s->type == COMEDI_SUBD_DO) {
|
|
if (s->n_chan < 32)
|
|
s->io_bits = (1 << s->n_chan) - 1;
|
|
else
|
|
s->io_bits = 0xffffffff;
|
|
}
|
|
|
|
if (s->len_chanlist == 0)
|
|
s->len_chanlist = 1;
|
|
|
|
if (s->do_cmd) {
|
|
ret = __comedi_device_postconfig_async(dev, s);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
if (!s->range_table && !s->range_table_list)
|
|
s->range_table = &range_unknown;
|
|
|
|
if (!s->insn_read && s->insn_bits)
|
|
s->insn_read = insn_rw_emulate_bits;
|
|
if (!s->insn_write && s->insn_bits)
|
|
s->insn_write = insn_rw_emulate_bits;
|
|
|
|
if (!s->insn_read)
|
|
s->insn_read = insn_inval;
|
|
if (!s->insn_write)
|
|
s->insn_write = insn_inval;
|
|
if (!s->insn_bits)
|
|
s->insn_bits = insn_inval;
|
|
if (!s->insn_config)
|
|
s->insn_config = insn_inval;
|
|
|
|
if (!s->poll)
|
|
s->poll = poll_invalid;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* do a little post-config cleanup */
|
|
static int comedi_device_postconfig(struct comedi_device *dev)
|
|
{
|
|
int ret;
|
|
|
|
ret = __comedi_device_postconfig(dev);
|
|
if (ret < 0)
|
|
return ret;
|
|
down_write(&dev->attach_lock);
|
|
dev->attached = true;
|
|
up_write(&dev->attach_lock);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Generic recognize function for drivers that register their supported
|
|
* board names.
|
|
*
|
|
* 'driv->board_name' points to a 'const char *' member within the
|
|
* zeroth element of an array of some private board information
|
|
* structure, say 'struct foo_board' containing a member 'const char
|
|
* *board_name' that is initialized to point to a board name string that
|
|
* is one of the candidates matched against this function's 'name'
|
|
* parameter.
|
|
*
|
|
* 'driv->offset' is the size of the private board information
|
|
* structure, say 'sizeof(struct foo_board)', and 'driv->num_names' is
|
|
* the length of the array of private board information structures.
|
|
*
|
|
* If one of the board names in the array of private board information
|
|
* structures matches the name supplied to this function, the function
|
|
* returns a pointer to the pointer to the board name, otherwise it
|
|
* returns NULL. The return value ends up in the 'board_ptr' member of
|
|
* a 'struct comedi_device' that the low-level comedi driver's
|
|
* 'attach()' hook can convert to a point to a particular element of its
|
|
* array of private board information structures by subtracting the
|
|
* offset of the member that points to the board name. (No subtraction
|
|
* is required if the board name pointer is the first member of the
|
|
* private board information structure, which is generally the case.)
|
|
*/
|
|
static void *comedi_recognize(struct comedi_driver *driv, const char *name)
|
|
{
|
|
char **name_ptr = (char **)driv->board_name;
|
|
int i;
|
|
|
|
for (i = 0; i < driv->num_names; i++) {
|
|
if (strcmp(*name_ptr, name) == 0)
|
|
return name_ptr;
|
|
name_ptr = (void *)name_ptr + driv->offset;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static void comedi_report_boards(struct comedi_driver *driv)
|
|
{
|
|
unsigned int i;
|
|
const char *const *name_ptr;
|
|
|
|
pr_info("comedi: valid board names for %s driver are:\n",
|
|
driv->driver_name);
|
|
|
|
name_ptr = driv->board_name;
|
|
for (i = 0; i < driv->num_names; i++) {
|
|
pr_info(" %s\n", *name_ptr);
|
|
name_ptr = (const char **)((char *)name_ptr + driv->offset);
|
|
}
|
|
|
|
if (driv->num_names == 0)
|
|
pr_info(" %s\n", driv->driver_name);
|
|
}
|
|
|
|
/**
|
|
* comedi_load_firmware() - Request and load firmware for a device.
|
|
* @dev: comedi_device struct
|
|
* @hw_device: device struct for the comedi_device
|
|
* @name: the name of the firmware image
|
|
* @cb: callback to the upload the firmware image
|
|
* @context: private context from the driver
|
|
*/
|
|
int comedi_load_firmware(struct comedi_device *dev,
|
|
struct device *device,
|
|
const char *name,
|
|
int (*cb)(struct comedi_device *dev,
|
|
const u8 *data, size_t size,
|
|
unsigned long context),
|
|
unsigned long context)
|
|
{
|
|
const struct firmware *fw;
|
|
int ret;
|
|
|
|
if (!cb)
|
|
return -EINVAL;
|
|
|
|
ret = request_firmware(&fw, name, device);
|
|
if (ret == 0) {
|
|
ret = cb(dev, fw->data, fw->size, context);
|
|
release_firmware(fw);
|
|
}
|
|
|
|
return ret < 0 ? ret : 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(comedi_load_firmware);
|
|
|
|
/**
|
|
* __comedi_request_region() - Request an I/O reqion for a legacy driver.
|
|
* @dev: comedi_device struct
|
|
* @start: base address of the I/O reqion
|
|
* @len: length of the I/O region
|
|
*/
|
|
int __comedi_request_region(struct comedi_device *dev,
|
|
unsigned long start, unsigned long len)
|
|
{
|
|
if (!start) {
|
|
dev_warn(dev->class_dev,
|
|
"%s: a I/O base address must be specified\n",
|
|
dev->board_name);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!request_region(start, len, dev->board_name)) {
|
|
dev_warn(dev->class_dev, "%s: I/O port conflict (%#lx,%lu)\n",
|
|
dev->board_name, start, len);
|
|
return -EIO;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(__comedi_request_region);
|
|
|
|
/**
|
|
* comedi_request_region() - Request an I/O reqion for a legacy driver.
|
|
* @dev: comedi_device struct
|
|
* @start: base address of the I/O reqion
|
|
* @len: length of the I/O region
|
|
*/
|
|
int comedi_request_region(struct comedi_device *dev,
|
|
unsigned long start, unsigned long len)
|
|
{
|
|
int ret;
|
|
|
|
ret = __comedi_request_region(dev, start, len);
|
|
if (ret == 0) {
|
|
dev->iobase = start;
|
|
dev->iolen = len;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(comedi_request_region);
|
|
|
|
/**
|
|
* comedi_legacy_detach() - A generic (*detach) function for legacy drivers.
|
|
* @dev: comedi_device struct
|
|
*/
|
|
void comedi_legacy_detach(struct comedi_device *dev)
|
|
{
|
|
if (dev->irq) {
|
|
free_irq(dev->irq, dev);
|
|
dev->irq = 0;
|
|
}
|
|
if (dev->iobase && dev->iolen) {
|
|
release_region(dev->iobase, dev->iolen);
|
|
dev->iobase = 0;
|
|
dev->iolen = 0;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(comedi_legacy_detach);
|
|
|
|
int comedi_device_attach(struct comedi_device *dev, struct comedi_devconfig *it)
|
|
{
|
|
struct comedi_driver *driv;
|
|
int ret;
|
|
|
|
if (dev->attached)
|
|
return -EBUSY;
|
|
|
|
mutex_lock(&comedi_drivers_list_lock);
|
|
for (driv = comedi_drivers; driv; driv = driv->next) {
|
|
if (!try_module_get(driv->module))
|
|
continue;
|
|
if (driv->num_names) {
|
|
dev->board_ptr = comedi_recognize(driv, it->board_name);
|
|
if (dev->board_ptr)
|
|
break;
|
|
} else if (strcmp(driv->driver_name, it->board_name) == 0) {
|
|
break;
|
|
}
|
|
module_put(driv->module);
|
|
}
|
|
if (driv == NULL) {
|
|
/* recognize has failed if we get here */
|
|
/* report valid board names before returning error */
|
|
for (driv = comedi_drivers; driv; driv = driv->next) {
|
|
if (!try_module_get(driv->module))
|
|
continue;
|
|
comedi_report_boards(driv);
|
|
module_put(driv->module);
|
|
}
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
if (driv->attach == NULL) {
|
|
/* driver does not support manual configuration */
|
|
dev_warn(dev->class_dev,
|
|
"driver '%s' does not support attach using comedi_config\n",
|
|
driv->driver_name);
|
|
module_put(driv->module);
|
|
ret = -ENOSYS;
|
|
goto out;
|
|
}
|
|
dev->driver = driv;
|
|
dev->board_name = dev->board_ptr ? *(const char **)dev->board_ptr
|
|
: dev->driver->driver_name;
|
|
ret = driv->attach(dev, it);
|
|
if (ret >= 0)
|
|
ret = comedi_device_postconfig(dev);
|
|
if (ret < 0) {
|
|
comedi_device_detach(dev);
|
|
module_put(driv->module);
|
|
}
|
|
/* On success, the driver module count has been incremented. */
|
|
out:
|
|
mutex_unlock(&comedi_drivers_list_lock);
|
|
return ret;
|
|
}
|
|
|
|
int comedi_auto_config(struct device *hardware_device,
|
|
struct comedi_driver *driver, unsigned long context)
|
|
{
|
|
struct comedi_device *dev;
|
|
int ret;
|
|
|
|
if (!hardware_device) {
|
|
pr_warn("BUG! comedi_auto_config called with NULL hardware_device\n");
|
|
return -EINVAL;
|
|
}
|
|
if (!driver) {
|
|
dev_warn(hardware_device,
|
|
"BUG! comedi_auto_config called with NULL comedi driver\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!driver->auto_attach) {
|
|
dev_warn(hardware_device,
|
|
"BUG! comedi driver '%s' has no auto_attach handler\n",
|
|
driver->driver_name);
|
|
return -EINVAL;
|
|
}
|
|
|
|
dev = comedi_alloc_board_minor(hardware_device);
|
|
if (IS_ERR(dev)) {
|
|
dev_warn(hardware_device,
|
|
"driver '%s' could not create device.\n",
|
|
driver->driver_name);
|
|
return PTR_ERR(dev);
|
|
}
|
|
/* Note: comedi_alloc_board_minor() locked dev->mutex. */
|
|
|
|
dev->driver = driver;
|
|
dev->board_name = dev->driver->driver_name;
|
|
ret = driver->auto_attach(dev, context);
|
|
if (ret >= 0)
|
|
ret = comedi_device_postconfig(dev);
|
|
mutex_unlock(&dev->mutex);
|
|
|
|
if (ret < 0) {
|
|
dev_warn(hardware_device,
|
|
"driver '%s' failed to auto-configure device.\n",
|
|
driver->driver_name);
|
|
comedi_release_hardware_device(hardware_device);
|
|
} else {
|
|
/*
|
|
* class_dev should be set properly here
|
|
* after a successful auto config
|
|
*/
|
|
dev_info(dev->class_dev,
|
|
"driver '%s' has successfully auto-configured '%s'.\n",
|
|
driver->driver_name, dev->board_name);
|
|
}
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(comedi_auto_config);
|
|
|
|
void comedi_auto_unconfig(struct device *hardware_device)
|
|
{
|
|
if (hardware_device == NULL)
|
|
return;
|
|
comedi_release_hardware_device(hardware_device);
|
|
}
|
|
EXPORT_SYMBOL_GPL(comedi_auto_unconfig);
|
|
|
|
int comedi_driver_register(struct comedi_driver *driver)
|
|
{
|
|
mutex_lock(&comedi_drivers_list_lock);
|
|
driver->next = comedi_drivers;
|
|
comedi_drivers = driver;
|
|
mutex_unlock(&comedi_drivers_list_lock);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(comedi_driver_register);
|
|
|
|
void comedi_driver_unregister(struct comedi_driver *driver)
|
|
{
|
|
struct comedi_driver *prev;
|
|
int i;
|
|
|
|
/* unlink the driver */
|
|
mutex_lock(&comedi_drivers_list_lock);
|
|
if (comedi_drivers == driver) {
|
|
comedi_drivers = driver->next;
|
|
} else {
|
|
for (prev = comedi_drivers; prev->next; prev = prev->next) {
|
|
if (prev->next == driver) {
|
|
prev->next = driver->next;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
mutex_unlock(&comedi_drivers_list_lock);
|
|
|
|
/* check for devices using this driver */
|
|
for (i = 0; i < COMEDI_NUM_BOARD_MINORS; i++) {
|
|
struct comedi_device *dev = comedi_dev_get_from_minor(i);
|
|
|
|
if (!dev)
|
|
continue;
|
|
|
|
mutex_lock(&dev->mutex);
|
|
if (dev->attached && dev->driver == driver) {
|
|
if (dev->use_count)
|
|
dev_warn(dev->class_dev,
|
|
"BUG! detaching device with use_count=%d\n",
|
|
dev->use_count);
|
|
comedi_device_detach(dev);
|
|
}
|
|
mutex_unlock(&dev->mutex);
|
|
comedi_dev_put(dev);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(comedi_driver_unregister);
|