2008-12-18 02:13:45 +01:00
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/*
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* Frontier Designs Alphatrack driver
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*
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* Copyright (C) 2007 Michael Taht (m@taht.net)
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*
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* Based on the usbled driver and ldusb drivers by
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*
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* Copyright (C) 2004 Greg Kroah-Hartman (greg@kroah.com)
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* Copyright (C) 2005 Michael Hund <mhund@ld-didactic.de>
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*
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* The ldusb driver was, in turn, derived from Lego USB Tower driver
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* Copyright (C) 2003 David Glance <advidgsf@sourceforge.net>
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* 2001-2004 Juergen Stuber <starblue@users.sourceforge.net>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation, version 2.
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*
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*/
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/**
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* This driver uses a ring buffer for time critical reading of
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* interrupt in reports and provides read and write methods for
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* raw interrupt reports.
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*/
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/* Note: this currently uses a dumb ringbuffer for reads and writes.
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* A more optimal driver would cache and kill off outstanding urbs that are
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* now invalid, and ignore ones that already were in the queue but valid
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* as we only have 30 commands for the alphatrack. In particular this is
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* key for getting lights to flash in time as otherwise many commands
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* can be buffered up before the light change makes it to the interface.
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*/
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/kobject.h>
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#include <linux/mutex.h>
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2009-01-20 15:33:21 +01:00
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#include <linux/uaccess.h>
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2008-12-18 02:13:45 +01:00
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#include <linux/input.h>
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#include <linux/usb.h>
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#include <linux/poll.h>
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#include "alphatrack.h"
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#define VENDOR_ID 0x165b
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#define PRODUCT_ID 0xfad1
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#ifdef CONFIG_USB_DYNAMIC_MINORS
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#define USB_ALPHATRACK_MINOR_BASE 0
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#else
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2009-01-20 15:33:21 +01:00
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/* FIXME 176 - is another driver's minor - apply for that */
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2008-12-18 02:13:45 +01:00
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#define USB_ALPHATRACK_MINOR_BASE 176
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#endif
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/* table of devices that work with this driver */
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2010-01-10 00:18:34 +01:00
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static const struct usb_device_id usb_alphatrack_table[] = {
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2009-01-20 15:33:21 +01:00
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{USB_DEVICE(VENDOR_ID, PRODUCT_ID)},
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{} /* Terminating entry */
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2008-12-18 02:13:45 +01:00
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};
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MODULE_DEVICE_TABLE(usb, usb_alphatrack_table);
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2009-01-20 15:33:21 +01:00
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MODULE_VERSION("0.41");
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2008-12-18 02:13:45 +01:00
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MODULE_AUTHOR("Mike Taht <m@taht.net>");
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MODULE_DESCRIPTION("Alphatrack USB Driver");
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MODULE_LICENSE("GPL");
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MODULE_SUPPORTED_DEVICE("Frontier Designs Alphatrack Control Surface");
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/* These aren't done yet */
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#define SUPPRESS_EXTRA_ONLINE_EVENTS 0
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#define BUFFERED_WRITES 0
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#define SUPPRESS_EXTRA_OFFLINE_EVENTS 0
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#define COMPRESS_FADER_EVENTS 0
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#define BUFFERED_READS 1
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#define RING_BUFFER_SIZE 512
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#define WRITE_BUFFER_SIZE 34
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#define ALPHATRACK_USB_TIMEOUT 10
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#define OUTPUT_CMD_SIZE 8
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#define INPUT_CMD_SIZE 12
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2009-01-20 15:33:21 +01:00
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#define ALPHATRACK_DEBUG 0
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2008-12-18 02:13:45 +01:00
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2009-01-20 15:33:21 +01:00
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static int debug = ALPHATRACK_DEBUG;
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2008-12-18 02:13:45 +01:00
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/* Use our own dbg macro */
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2009-01-20 15:33:21 +01:00
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#define dbg_info(dev, format, arg...) do \
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2010-11-01 18:12:05 +01:00
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{ if (debug) dev_info(dev , format , ## arg); } while (0)
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2008-12-18 02:13:45 +01:00
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#define alphatrack_ocmd_info(dev, cmd, format, arg...)
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#define alphatrack_icmd_info(dev, cmd, format, arg...)
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/* Module parameters */
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module_param(debug, int, S_IRUGO | S_IWUSR);
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MODULE_PARM_DESC(debug, "Debug enabled or not");
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/* All interrupt in transfers are collected in a ring buffer to
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* avoid racing conditions and get better performance of the driver.
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*/
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static int ring_buffer_size = RING_BUFFER_SIZE;
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2009-01-20 15:33:21 +01:00
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module_param(ring_buffer_size, int, S_IRUGO);
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2008-12-18 02:13:45 +01:00
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MODULE_PARM_DESC(ring_buffer_size, "Read ring buffer size");
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/* The write_buffer can one day contain more than one interrupt out transfer.
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*/
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static int write_buffer_size = WRITE_BUFFER_SIZE;
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2009-01-20 15:33:21 +01:00
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module_param(write_buffer_size, int, S_IRUGO);
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2008-12-18 02:13:45 +01:00
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MODULE_PARM_DESC(write_buffer_size, "Write buffer size");
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/*
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* Increase the interval for debugging purposes.
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* or set to 1 to use the standard interval from the endpoint descriptors.
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*/
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static int min_interrupt_in_interval = ALPHATRACK_USB_TIMEOUT;
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module_param(min_interrupt_in_interval, int, 0);
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2009-01-20 15:33:21 +01:00
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MODULE_PARM_DESC(min_interrupt_in_interval,
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"Minimum interrupt in interval in ms");
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2008-12-18 02:13:45 +01:00
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static int min_interrupt_out_interval = ALPHATRACK_USB_TIMEOUT;
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module_param(min_interrupt_out_interval, int, 0);
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2009-01-20 15:33:21 +01:00
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MODULE_PARM_DESC(min_interrupt_out_interval,
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"Minimum interrupt out interval in ms");
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2008-12-18 02:13:45 +01:00
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/* Structure to hold all of our device specific stuff */
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struct usb_alphatrack {
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2010-03-09 07:15:33 +01:00
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struct mutex mtx; /* locks this structure */
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2009-01-20 15:33:21 +01:00
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struct usb_interface *intf; /* save off the usb interface pointer */
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int open_count; /* number of times this port has been opened */
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/* make gcc happy */
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struct alphatrack_icmd (*ring_buffer)[RING_BUFFER_SIZE];
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struct alphatrack_ocmd (*write_buffer)[WRITE_BUFFER_SIZE];
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unsigned int ring_head;
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unsigned int ring_tail;
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wait_queue_head_t read_wait;
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wait_queue_head_t write_wait;
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unsigned char *interrupt_in_buffer;
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unsigned char *oldi_buffer;
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struct usb_endpoint_descriptor *interrupt_in_endpoint;
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struct urb *interrupt_in_urb;
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int interrupt_in_interval;
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size_t interrupt_in_endpoint_size;
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int interrupt_in_running;
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int interrupt_in_done;
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char *interrupt_out_buffer;
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struct usb_endpoint_descriptor *interrupt_out_endpoint;
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struct urb *interrupt_out_urb;
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int interrupt_out_interval;
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size_t interrupt_out_endpoint_size;
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int interrupt_out_busy;
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2008-12-18 02:13:45 +01:00
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atomic_t writes_pending;
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2009-01-20 15:33:21 +01:00
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int event; /* alternate interface to events */
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int fader; /* 10 bits */
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int lights; /* 23 bits */
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unsigned char dump_state; /* 0 if disabled 1 if enabled */
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unsigned char enable; /* 0 if disabled 1 if enabled */
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unsigned char offline; /* if the device is out of range or asleep */
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unsigned char verbose; /* be verbose in error reporting */
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unsigned char last_cmd[OUTPUT_CMD_SIZE];
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unsigned char screen[32];
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2008-12-18 02:13:45 +01:00
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};
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/* prevent races between open() and disconnect() */
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static DEFINE_MUTEX(disconnect_mutex);
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/* forward declaration */
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static struct usb_driver usb_alphatrack_driver;
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/**
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* usb_alphatrack_abort_transfers
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* aborts transfers and frees associated data structures
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*/
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static void usb_alphatrack_abort_transfers(struct usb_alphatrack *dev)
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{
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/* shutdown transfer */
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if (dev->interrupt_in_running) {
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dev->interrupt_in_running = 0;
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if (dev->intf)
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usb_kill_urb(dev->interrupt_in_urb);
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}
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if (dev->interrupt_out_busy)
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if (dev->intf)
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usb_kill_urb(dev->interrupt_out_urb);
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}
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/**
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* usb_alphatrack_delete
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*/
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static void usb_alphatrack_delete(struct usb_alphatrack *dev)
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{
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usb_alphatrack_abort_transfers(dev);
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usb_free_urb(dev->interrupt_in_urb);
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usb_free_urb(dev->interrupt_out_urb);
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kfree(dev->ring_buffer);
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kfree(dev->interrupt_in_buffer);
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kfree(dev->interrupt_out_buffer);
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2009-01-20 15:33:21 +01:00
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kfree(dev); /* fixme oldi_buffer */
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2008-12-18 02:13:45 +01:00
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}
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/**
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* usb_alphatrack_interrupt_in_callback
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*/
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static void usb_alphatrack_interrupt_in_callback(struct urb *urb)
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{
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struct usb_alphatrack *dev = urb->context;
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unsigned int next_ring_head;
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int retval = -1;
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if (urb->status) {
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if (urb->status == -ENOENT ||
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2009-01-20 15:33:21 +01:00
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urb->status == -ECONNRESET || urb->status == -ESHUTDOWN) {
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2008-12-18 02:13:45 +01:00
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goto exit;
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} else {
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2009-01-20 15:33:21 +01:00
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dbg_info(&dev->intf->dev,
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"%s: nonzero status received: %d\n", __func__,
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urb->status);
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goto resubmit; /* maybe we can recover */
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2008-12-18 02:13:45 +01:00
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}
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}
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if (urb->actual_length != INPUT_CMD_SIZE) {
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dev_warn(&dev->intf->dev,
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2009-01-20 15:33:21 +01:00
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"Urb length was %d bytes!!"
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2010-03-07 15:19:39 +01:00
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"Do something intelligent\n", urb->actual_length);
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2008-12-18 02:13:45 +01:00
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} else {
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2009-01-20 15:33:21 +01:00
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alphatrack_ocmd_info(&dev->intf->dev,
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&(*dev->ring_buffer)[dev->ring_tail].cmd,
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"%s", "bla");
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if (memcmp
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(dev->interrupt_in_buffer, dev->oldi_buffer,
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INPUT_CMD_SIZE) == 0) {
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goto resubmit;
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2008-12-18 02:13:45 +01:00
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}
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2009-01-20 15:33:21 +01:00
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memcpy(dev->oldi_buffer, dev->interrupt_in_buffer,
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INPUT_CMD_SIZE);
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2008-12-18 02:13:45 +01:00
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#if SUPPRESS_EXTRA_OFFLINE_EVENTS
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2009-01-20 15:33:21 +01:00
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if (dev->offline == 2 && dev->interrupt_in_buffer[1] == 0xff)
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goto resubmit;
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if (dev->offline == 1 && dev->interrupt_in_buffer[1] == 0xff) {
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dev->offline = 2;
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goto resubmit;
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}
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2008-12-18 02:13:45 +01:00
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/* Always pass one offline event up the stack */
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2009-01-20 15:33:21 +01:00
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if (dev->offline > 0 && dev->interrupt_in_buffer[1] != 0xff)
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dev->offline = 0;
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if (dev->offline == 0 && dev->interrupt_in_buffer[1] == 0xff)
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dev->offline = 1;
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2008-12-18 02:13:45 +01:00
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#endif
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2009-01-20 15:33:21 +01:00
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dbg_info(&dev->intf->dev, "%s: head, tail are %x, %x\n",
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__func__, dev->ring_head, dev->ring_tail);
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next_ring_head = (dev->ring_head + 1) % ring_buffer_size;
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2008-12-18 02:13:45 +01:00
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if (next_ring_head != dev->ring_tail) {
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memcpy(&((*dev->ring_buffer)[dev->ring_head]),
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2009-01-20 15:33:21 +01:00
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dev->interrupt_in_buffer, urb->actual_length);
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2008-12-18 02:13:45 +01:00
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dev->ring_head = next_ring_head;
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retval = 0;
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memset(dev->interrupt_in_buffer, 0, urb->actual_length);
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} else {
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dev_warn(&dev->intf->dev,
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"Ring buffer overflow, %d bytes dropped\n",
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urb->actual_length);
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memset(dev->interrupt_in_buffer, 0, urb->actual_length);
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}
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}
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resubmit:
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/* resubmit if we're still running */
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if (dev->interrupt_in_running && dev->intf) {
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retval = usb_submit_urb(dev->interrupt_in_urb, GFP_ATOMIC);
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if (retval)
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dev_err(&dev->intf->dev,
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"usb_submit_urb failed (%d)\n", retval);
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}
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exit:
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dev->interrupt_in_done = 1;
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wake_up_interruptible(&dev->read_wait);
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}
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/**
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* usb_alphatrack_interrupt_out_callback
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*/
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static void usb_alphatrack_interrupt_out_callback(struct urb *urb)
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{
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struct usb_alphatrack *dev = urb->context;
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/* sync/async unlink faults aren't errors */
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if (urb->status && !(urb->status == -ENOENT ||
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urb->status == -ECONNRESET ||
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urb->status == -ESHUTDOWN))
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dbg_info(&dev->intf->dev,
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"%s - nonzero write interrupt status received: %d\n",
|
2009-01-07 23:31:57 +01:00
|
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__func__, urb->status);
|
2008-12-18 02:13:45 +01:00
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atomic_dec(&dev->writes_pending);
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dev->interrupt_out_busy = 0;
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wake_up_interruptible(&dev->write_wait);
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}
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|
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/**
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* usb_alphatrack_open
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*/
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static int usb_alphatrack_open(struct inode *inode, struct file *file)
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|
|
|
{
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struct usb_alphatrack *dev;
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int subminor;
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int retval = 0;
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struct usb_interface *interface;
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nonseekable_open(inode, file);
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subminor = iminor(inode);
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|
|
|
|
|
|
|
mutex_lock(&disconnect_mutex);
|
|
|
|
|
|
|
|
interface = usb_find_interface(&usb_alphatrack_driver, subminor);
|
|
|
|
|
|
|
|
if (!interface) {
|
|
|
|
err("%s - error, can't find device for minor %d\n",
|
2009-01-20 15:33:21 +01:00
|
|
|
__func__, subminor);
|
2008-12-18 02:13:45 +01:00
|
|
|
retval = -ENODEV;
|
|
|
|
goto unlock_disconnect_exit;
|
|
|
|
}
|
|
|
|
|
|
|
|
dev = usb_get_intfdata(interface);
|
|
|
|
|
|
|
|
if (!dev) {
|
|
|
|
retval = -ENODEV;
|
|
|
|
goto unlock_disconnect_exit;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* lock this device */
|
2010-03-09 07:15:33 +01:00
|
|
|
if (mutex_lock_interruptible(&dev->mtx)) {
|
2008-12-18 02:13:45 +01:00
|
|
|
retval = -ERESTARTSYS;
|
|
|
|
goto unlock_disconnect_exit;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* allow opening only once */
|
|
|
|
if (dev->open_count) {
|
|
|
|
retval = -EBUSY;
|
|
|
|
goto unlock_exit;
|
|
|
|
}
|
|
|
|
dev->open_count = 1;
|
|
|
|
|
|
|
|
/* initialize in direction */
|
|
|
|
dev->ring_head = 0;
|
|
|
|
dev->ring_tail = 0;
|
|
|
|
usb_fill_int_urb(dev->interrupt_in_urb,
|
|
|
|
interface_to_usbdev(interface),
|
|
|
|
usb_rcvintpipe(interface_to_usbdev(interface),
|
2009-01-20 15:33:21 +01:00
|
|
|
dev->interrupt_in_endpoint->
|
|
|
|
bEndpointAddress),
|
2008-12-18 02:13:45 +01:00
|
|
|
dev->interrupt_in_buffer,
|
|
|
|
dev->interrupt_in_endpoint_size,
|
2009-01-20 15:33:21 +01:00
|
|
|
usb_alphatrack_interrupt_in_callback, dev,
|
2008-12-18 02:13:45 +01:00
|
|
|
dev->interrupt_in_interval);
|
|
|
|
|
|
|
|
dev->interrupt_in_running = 1;
|
|
|
|
dev->interrupt_in_done = 0;
|
|
|
|
dev->enable = 1;
|
|
|
|
dev->offline = 0;
|
|
|
|
|
|
|
|
retval = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL);
|
|
|
|
if (retval) {
|
2009-01-20 15:33:21 +01:00
|
|
|
dev_err(&interface->dev,
|
|
|
|
"Couldn't submit interrupt_in_urb %d\n", retval);
|
2008-12-18 02:13:45 +01:00
|
|
|
dev->interrupt_in_running = 0;
|
|
|
|
dev->open_count = 0;
|
|
|
|
goto unlock_exit;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* save device in the file's private structure */
|
|
|
|
file->private_data = dev;
|
|
|
|
|
|
|
|
unlock_exit:
|
2010-03-09 07:15:33 +01:00
|
|
|
mutex_unlock(&dev->mtx);
|
2008-12-18 02:13:45 +01:00
|
|
|
|
|
|
|
unlock_disconnect_exit:
|
|
|
|
mutex_unlock(&disconnect_mutex);
|
|
|
|
|
|
|
|
return retval;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* usb_alphatrack_release
|
|
|
|
*/
|
|
|
|
static int usb_alphatrack_release(struct inode *inode, struct file *file)
|
|
|
|
{
|
|
|
|
struct usb_alphatrack *dev;
|
|
|
|
int retval = 0;
|
|
|
|
|
|
|
|
dev = file->private_data;
|
|
|
|
|
|
|
|
if (dev == NULL) {
|
|
|
|
retval = -ENODEV;
|
|
|
|
goto exit;
|
|
|
|
}
|
|
|
|
|
2010-03-09 07:15:33 +01:00
|
|
|
if (mutex_lock_interruptible(&dev->mtx)) {
|
2008-12-18 02:13:45 +01:00
|
|
|
retval = -ERESTARTSYS;
|
|
|
|
goto exit;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (dev->open_count != 1) {
|
|
|
|
retval = -ENODEV;
|
|
|
|
goto unlock_exit;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (dev->intf == NULL) {
|
|
|
|
/* the device was unplugged before the file was released */
|
2010-03-09 07:15:33 +01:00
|
|
|
mutex_unlock(&dev->mtx);
|
2008-12-18 02:13:45 +01:00
|
|
|
/* unlock here as usb_alphatrack_delete frees dev */
|
|
|
|
usb_alphatrack_delete(dev);
|
|
|
|
retval = -ENODEV;
|
|
|
|
goto exit;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* wait until write transfer is finished */
|
|
|
|
if (dev->interrupt_out_busy)
|
2009-01-20 15:33:21 +01:00
|
|
|
wait_event_interruptible_timeout(dev->write_wait,
|
|
|
|
!dev->interrupt_out_busy,
|
|
|
|
2 * HZ);
|
2008-12-18 02:13:45 +01:00
|
|
|
usb_alphatrack_abort_transfers(dev);
|
|
|
|
dev->open_count = 0;
|
|
|
|
|
|
|
|
unlock_exit:
|
2010-03-09 07:15:33 +01:00
|
|
|
mutex_unlock(&dev->mtx);
|
2008-12-18 02:13:45 +01:00
|
|
|
|
|
|
|
exit:
|
|
|
|
return retval;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* usb_alphatrack_poll
|
|
|
|
*/
|
2009-01-20 15:33:21 +01:00
|
|
|
static unsigned int usb_alphatrack_poll(struct file *file, poll_table * wait)
|
2008-12-18 02:13:45 +01:00
|
|
|
{
|
|
|
|
struct usb_alphatrack *dev;
|
|
|
|
unsigned int mask = 0;
|
|
|
|
|
|
|
|
dev = file->private_data;
|
|
|
|
|
|
|
|
poll_wait(file, &dev->read_wait, wait);
|
|
|
|
poll_wait(file, &dev->write_wait, wait);
|
|
|
|
|
|
|
|
if (dev->ring_head != dev->ring_tail)
|
|
|
|
mask |= POLLIN | POLLRDNORM;
|
|
|
|
if (!dev->interrupt_out_busy)
|
|
|
|
mask |= POLLOUT | POLLWRNORM;
|
|
|
|
|
|
|
|
return mask;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* usb_alphatrack_read
|
|
|
|
*/
|
2009-01-20 15:33:21 +01:00
|
|
|
static ssize_t usb_alphatrack_read(struct file *file, char __user *buffer,
|
|
|
|
size_t count, loff_t *ppos)
|
2008-12-18 02:13:45 +01:00
|
|
|
{
|
|
|
|
struct usb_alphatrack *dev;
|
|
|
|
int retval = 0;
|
|
|
|
|
|
|
|
int c = 0;
|
|
|
|
|
|
|
|
dev = file->private_data;
|
|
|
|
|
|
|
|
/* verify that we actually have some data to read */
|
|
|
|
if (count == 0)
|
|
|
|
goto exit;
|
|
|
|
|
|
|
|
/* lock this object */
|
2010-03-09 07:15:33 +01:00
|
|
|
if (mutex_lock_interruptible(&dev->mtx)) {
|
2008-12-18 02:13:45 +01:00
|
|
|
retval = -ERESTARTSYS;
|
|
|
|
goto exit;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* verify that the device wasn't unplugged */
|
|
|
|
if (dev->intf == NULL) {
|
|
|
|
retval = -ENODEV;
|
|
|
|
err("No device or device unplugged %d\n", retval);
|
|
|
|
goto unlock_exit;
|
|
|
|
}
|
|
|
|
|
|
|
|
while (dev->ring_head == dev->ring_tail) {
|
2009-01-20 15:33:21 +01:00
|
|
|
if (file->f_flags & O_NONBLOCK) {
|
|
|
|
retval = -EAGAIN;
|
|
|
|
goto unlock_exit;
|
|
|
|
}
|
|
|
|
dev->interrupt_in_done = 0;
|
|
|
|
retval =
|
|
|
|
wait_event_interruptible(dev->read_wait,
|
|
|
|
dev->interrupt_in_done);
|
|
|
|
if (retval < 0)
|
|
|
|
goto unlock_exit;
|
|
|
|
}
|
|
|
|
|
|
|
|
alphatrack_ocmd_info(&dev->intf->dev,
|
|
|
|
&(*dev->ring_buffer)[dev->ring_tail].cmd, "%s",
|
|
|
|
": copying to userspace");
|
|
|
|
|
|
|
|
c = 0;
|
|
|
|
while ((c < count) && (dev->ring_tail != dev->ring_head)) {
|
|
|
|
if (copy_to_user
|
|
|
|
(&buffer[c], &(*dev->ring_buffer)[dev->ring_tail],
|
|
|
|
INPUT_CMD_SIZE)) {
|
|
|
|
retval = -EFAULT;
|
|
|
|
goto unlock_exit;
|
|
|
|
}
|
|
|
|
dev->ring_tail = (dev->ring_tail + 1) % ring_buffer_size;
|
|
|
|
c += INPUT_CMD_SIZE;
|
|
|
|
dbg_info(&dev->intf->dev, "%s: head, tail are %x, %x\n",
|
|
|
|
__func__, dev->ring_head, dev->ring_tail);
|
|
|
|
}
|
|
|
|
retval = c;
|
2008-12-18 02:13:45 +01:00
|
|
|
|
|
|
|
unlock_exit:
|
|
|
|
/* unlock the device */
|
2010-03-09 07:15:33 +01:00
|
|
|
mutex_unlock(&dev->mtx);
|
2008-12-18 02:13:45 +01:00
|
|
|
|
|
|
|
exit:
|
|
|
|
return retval;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* usb_alphatrack_write
|
|
|
|
*/
|
2009-01-20 15:33:21 +01:00
|
|
|
static ssize_t usb_alphatrack_write(struct file *file,
|
|
|
|
const char __user *buffer, size_t count,
|
|
|
|
loff_t *ppos)
|
2008-12-18 02:13:45 +01:00
|
|
|
{
|
|
|
|
struct usb_alphatrack *dev;
|
|
|
|
size_t bytes_to_write;
|
|
|
|
int retval = 0;
|
|
|
|
|
|
|
|
dev = file->private_data;
|
|
|
|
|
|
|
|
/* verify that we actually have some data to write */
|
|
|
|
if (count == 0)
|
|
|
|
goto exit;
|
|
|
|
|
|
|
|
/* lock this object */
|
2010-03-09 07:15:33 +01:00
|
|
|
if (mutex_lock_interruptible(&dev->mtx)) {
|
2008-12-18 02:13:45 +01:00
|
|
|
retval = -ERESTARTSYS;
|
|
|
|
goto exit;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* verify that the device wasn't unplugged */
|
|
|
|
if (dev->intf == NULL) {
|
|
|
|
retval = -ENODEV;
|
|
|
|
err("No device or device unplugged %d\n", retval);
|
|
|
|
goto unlock_exit;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* wait until previous transfer is finished */
|
|
|
|
if (dev->interrupt_out_busy) {
|
|
|
|
if (file->f_flags & O_NONBLOCK) {
|
|
|
|
retval = -EAGAIN;
|
|
|
|
goto unlock_exit;
|
|
|
|
}
|
2009-01-20 15:33:21 +01:00
|
|
|
retval =
|
|
|
|
wait_event_interruptible(dev->write_wait,
|
|
|
|
!dev->interrupt_out_busy);
|
|
|
|
if (retval < 0)
|
2008-12-18 02:13:45 +01:00
|
|
|
goto unlock_exit;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* write the data into interrupt_out_buffer from userspace */
|
2009-01-20 15:33:21 +01:00
|
|
|
/* FIXME - if you write more than 12 bytes this breaks */
|
|
|
|
bytes_to_write =
|
|
|
|
min(count, write_buffer_size * dev->interrupt_out_endpoint_size);
|
2008-12-18 02:13:45 +01:00
|
|
|
if (bytes_to_write < count)
|
2009-01-20 15:33:21 +01:00
|
|
|
dev_warn(&dev->intf->dev,
|
|
|
|
"Write buffer overflow, %zd bytes dropped\n",
|
|
|
|
count - bytes_to_write);
|
2008-12-18 02:13:45 +01:00
|
|
|
|
2009-01-20 15:33:21 +01:00
|
|
|
dbg_info(&dev->intf->dev, "%s: count = %zd, bytes_to_write = %zd\n",
|
|
|
|
__func__, count, bytes_to_write);
|
2008-12-18 02:13:45 +01:00
|
|
|
|
|
|
|
if (copy_from_user(dev->interrupt_out_buffer, buffer, bytes_to_write)) {
|
|
|
|
retval = -EFAULT;
|
|
|
|
goto unlock_exit;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (dev->interrupt_out_endpoint == NULL) {
|
2010-03-07 15:19:39 +01:00
|
|
|
err("Endpoint should not be be null!\n");
|
2008-12-18 02:13:45 +01:00
|
|
|
goto unlock_exit;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* send off the urb */
|
|
|
|
usb_fill_int_urb(dev->interrupt_out_urb,
|
|
|
|
interface_to_usbdev(dev->intf),
|
|
|
|
usb_sndintpipe(interface_to_usbdev(dev->intf),
|
2009-01-20 15:33:21 +01:00
|
|
|
dev->interrupt_out_endpoint->
|
|
|
|
bEndpointAddress),
|
|
|
|
dev->interrupt_out_buffer, bytes_to_write,
|
|
|
|
usb_alphatrack_interrupt_out_callback, dev,
|
2008-12-18 02:13:45 +01:00
|
|
|
dev->interrupt_out_interval);
|
|
|
|
dev->interrupt_out_busy = 1;
|
|
|
|
atomic_inc(&dev->writes_pending);
|
|
|
|
wmb();
|
|
|
|
|
|
|
|
retval = usb_submit_urb(dev->interrupt_out_urb, GFP_KERNEL);
|
|
|
|
if (retval) {
|
|
|
|
dev->interrupt_out_busy = 0;
|
|
|
|
err("Couldn't submit interrupt_out_urb %d\n", retval);
|
|
|
|
atomic_dec(&dev->writes_pending);
|
|
|
|
goto unlock_exit;
|
|
|
|
}
|
|
|
|
retval = bytes_to_write;
|
|
|
|
|
|
|
|
unlock_exit:
|
|
|
|
/* unlock the device */
|
2010-03-09 07:15:33 +01:00
|
|
|
mutex_unlock(&dev->mtx);
|
2008-12-18 02:13:45 +01:00
|
|
|
|
|
|
|
exit:
|
|
|
|
return retval;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* file operations needed when we register this driver */
|
|
|
|
static const struct file_operations usb_alphatrack_fops = {
|
2009-01-20 15:33:21 +01:00
|
|
|
.owner = THIS_MODULE,
|
|
|
|
.read = usb_alphatrack_read,
|
|
|
|
.write = usb_alphatrack_write,
|
|
|
|
.open = usb_alphatrack_open,
|
|
|
|
.release = usb_alphatrack_release,
|
|
|
|
.poll = usb_alphatrack_poll,
|
llseek: automatically add .llseek fop
All file_operations should get a .llseek operation so we can make
nonseekable_open the default for future file operations without a
.llseek pointer.
The three cases that we can automatically detect are no_llseek, seq_lseek
and default_llseek. For cases where we can we can automatically prove that
the file offset is always ignored, we use noop_llseek, which maintains
the current behavior of not returning an error from a seek.
New drivers should normally not use noop_llseek but instead use no_llseek
and call nonseekable_open at open time. Existing drivers can be converted
to do the same when the maintainer knows for certain that no user code
relies on calling seek on the device file.
The generated code is often incorrectly indented and right now contains
comments that clarify for each added line why a specific variant was
chosen. In the version that gets submitted upstream, the comments will
be gone and I will manually fix the indentation, because there does not
seem to be a way to do that using coccinelle.
Some amount of new code is currently sitting in linux-next that should get
the same modifications, which I will do at the end of the merge window.
Many thanks to Julia Lawall for helping me learn to write a semantic
patch that does all this.
===== begin semantic patch =====
// This adds an llseek= method to all file operations,
// as a preparation for making no_llseek the default.
//
// The rules are
// - use no_llseek explicitly if we do nonseekable_open
// - use seq_lseek for sequential files
// - use default_llseek if we know we access f_pos
// - use noop_llseek if we know we don't access f_pos,
// but we still want to allow users to call lseek
//
@ open1 exists @
identifier nested_open;
@@
nested_open(...)
{
<+...
nonseekable_open(...)
...+>
}
@ open exists@
identifier open_f;
identifier i, f;
identifier open1.nested_open;
@@
int open_f(struct inode *i, struct file *f)
{
<+...
(
nonseekable_open(...)
|
nested_open(...)
)
...+>
}
@ read disable optional_qualifier exists @
identifier read_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
expression E;
identifier func;
@@
ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off)
{
<+...
(
*off = E
|
*off += E
|
func(..., off, ...)
|
E = *off
)
...+>
}
@ read_no_fpos disable optional_qualifier exists @
identifier read_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
@@
ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off)
{
... when != off
}
@ write @
identifier write_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
expression E;
identifier func;
@@
ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off)
{
<+...
(
*off = E
|
*off += E
|
func(..., off, ...)
|
E = *off
)
...+>
}
@ write_no_fpos @
identifier write_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
@@
ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off)
{
... when != off
}
@ fops0 @
identifier fops;
@@
struct file_operations fops = {
...
};
@ has_llseek depends on fops0 @
identifier fops0.fops;
identifier llseek_f;
@@
struct file_operations fops = {
...
.llseek = llseek_f,
...
};
@ has_read depends on fops0 @
identifier fops0.fops;
identifier read_f;
@@
struct file_operations fops = {
...
.read = read_f,
...
};
@ has_write depends on fops0 @
identifier fops0.fops;
identifier write_f;
@@
struct file_operations fops = {
...
.write = write_f,
...
};
@ has_open depends on fops0 @
identifier fops0.fops;
identifier open_f;
@@
struct file_operations fops = {
...
.open = open_f,
...
};
// use no_llseek if we call nonseekable_open
////////////////////////////////////////////
@ nonseekable1 depends on !has_llseek && has_open @
identifier fops0.fops;
identifier nso ~= "nonseekable_open";
@@
struct file_operations fops = {
... .open = nso, ...
+.llseek = no_llseek, /* nonseekable */
};
@ nonseekable2 depends on !has_llseek @
identifier fops0.fops;
identifier open.open_f;
@@
struct file_operations fops = {
... .open = open_f, ...
+.llseek = no_llseek, /* open uses nonseekable */
};
// use seq_lseek for sequential files
/////////////////////////////////////
@ seq depends on !has_llseek @
identifier fops0.fops;
identifier sr ~= "seq_read";
@@
struct file_operations fops = {
... .read = sr, ...
+.llseek = seq_lseek, /* we have seq_read */
};
// use default_llseek if there is a readdir
///////////////////////////////////////////
@ fops1 depends on !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier readdir_e;
@@
// any other fop is used that changes pos
struct file_operations fops = {
... .readdir = readdir_e, ...
+.llseek = default_llseek, /* readdir is present */
};
// use default_llseek if at least one of read/write touches f_pos
/////////////////////////////////////////////////////////////////
@ fops2 depends on !fops1 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier read.read_f;
@@
// read fops use offset
struct file_operations fops = {
... .read = read_f, ...
+.llseek = default_llseek, /* read accesses f_pos */
};
@ fops3 depends on !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier write.write_f;
@@
// write fops use offset
struct file_operations fops = {
... .write = write_f, ...
+ .llseek = default_llseek, /* write accesses f_pos */
};
// Use noop_llseek if neither read nor write accesses f_pos
///////////////////////////////////////////////////////////
@ fops4 depends on !fops1 && !fops2 && !fops3 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier read_no_fpos.read_f;
identifier write_no_fpos.write_f;
@@
// write fops use offset
struct file_operations fops = {
...
.write = write_f,
.read = read_f,
...
+.llseek = noop_llseek, /* read and write both use no f_pos */
};
@ depends on has_write && !has_read && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier write_no_fpos.write_f;
@@
struct file_operations fops = {
... .write = write_f, ...
+.llseek = noop_llseek, /* write uses no f_pos */
};
@ depends on has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier read_no_fpos.read_f;
@@
struct file_operations fops = {
... .read = read_f, ...
+.llseek = noop_llseek, /* read uses no f_pos */
};
@ depends on !has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
@@
struct file_operations fops = {
...
+.llseek = noop_llseek, /* no read or write fn */
};
===== End semantic patch =====
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Julia Lawall <julia@diku.dk>
Cc: Christoph Hellwig <hch@infradead.org>
2010-08-15 18:52:59 +02:00
|
|
|
.llseek = no_llseek,
|
2008-12-18 02:13:45 +01:00
|
|
|
};
|
|
|
|
|
|
|
|
/*
|
|
|
|
* usb class driver info in order to get a minor number from the usb core,
|
|
|
|
* and to have the device registered with the driver core
|
|
|
|
*/
|
|
|
|
|
|
|
|
static struct usb_class_driver usb_alphatrack_class = {
|
2009-01-20 15:33:21 +01:00
|
|
|
.name = "alphatrack%d",
|
|
|
|
.fops = &usb_alphatrack_fops,
|
|
|
|
.minor_base = USB_ALPHATRACK_MINOR_BASE,
|
2008-12-18 02:13:45 +01:00
|
|
|
};
|
|
|
|
|
|
|
|
/**
|
|
|
|
* usb_alphatrack_probe
|
|
|
|
*
|
|
|
|
* Called by the usb core when a new device is connected that it thinks
|
|
|
|
* this driver might be interested in.
|
|
|
|
*/
|
2009-01-20 15:33:21 +01:00
|
|
|
static int usb_alphatrack_probe(struct usb_interface *intf,
|
|
|
|
const struct usb_device_id *id)
|
2008-12-18 02:13:45 +01:00
|
|
|
{
|
|
|
|
struct usb_device *udev = interface_to_usbdev(intf);
|
|
|
|
struct usb_alphatrack *dev = NULL;
|
|
|
|
struct usb_host_interface *iface_desc;
|
|
|
|
struct usb_endpoint_descriptor *endpoint;
|
|
|
|
int i;
|
|
|
|
int true_size;
|
|
|
|
int retval = -ENOMEM;
|
|
|
|
|
2010-09-01 15:40:25 +02:00
|
|
|
/* allocate memory for our device state and initialize it */
|
2008-12-18 02:13:45 +01:00
|
|
|
|
|
|
|
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
|
|
|
|
if (dev == NULL) {
|
|
|
|
dev_err(&intf->dev, "Out of memory\n");
|
|
|
|
goto exit;
|
|
|
|
}
|
2010-03-09 07:15:33 +01:00
|
|
|
mutex_init(&dev->mtx);
|
2008-12-18 02:13:45 +01:00
|
|
|
dev->intf = intf;
|
|
|
|
init_waitqueue_head(&dev->read_wait);
|
|
|
|
init_waitqueue_head(&dev->write_wait);
|
|
|
|
|
|
|
|
iface_desc = intf->cur_altsetting;
|
|
|
|
|
|
|
|
/* set up the endpoint information */
|
|
|
|
for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
|
|
|
|
endpoint = &iface_desc->endpoint[i].desc;
|
|
|
|
|
|
|
|
if (usb_endpoint_is_int_in(endpoint))
|
|
|
|
dev->interrupt_in_endpoint = endpoint;
|
|
|
|
|
|
|
|
if (usb_endpoint_is_int_out(endpoint))
|
|
|
|
dev->interrupt_out_endpoint = endpoint;
|
|
|
|
}
|
|
|
|
if (dev->interrupt_in_endpoint == NULL) {
|
|
|
|
dev_err(&intf->dev, "Interrupt in endpoint not found\n");
|
|
|
|
goto error;
|
|
|
|
}
|
|
|
|
if (dev->interrupt_out_endpoint == NULL)
|
2009-01-20 15:33:21 +01:00
|
|
|
dev_warn(&intf->dev,
|
|
|
|
"Interrupt out endpoint not found"
|
|
|
|
"(using control endpoint instead)\n");
|
2008-12-18 02:13:45 +01:00
|
|
|
|
2009-01-20 15:33:21 +01:00
|
|
|
dev->interrupt_in_endpoint_size =
|
|
|
|
le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize);
|
2008-12-18 02:13:45 +01:00
|
|
|
|
|
|
|
if (dev->interrupt_in_endpoint_size != 64)
|
2009-01-20 15:33:21 +01:00
|
|
|
dev_warn(&intf->dev, "Interrupt in endpoint size is not 64!\n");
|
2008-12-18 02:13:45 +01:00
|
|
|
|
2009-01-20 15:33:21 +01:00
|
|
|
if (ring_buffer_size == 0)
|
|
|
|
ring_buffer_size = RING_BUFFER_SIZE;
|
2008-12-18 02:13:45 +01:00
|
|
|
|
2009-01-20 15:33:21 +01:00
|
|
|
true_size = min(ring_buffer_size, RING_BUFFER_SIZE);
|
2008-12-18 02:13:45 +01:00
|
|
|
|
2009-01-20 15:33:21 +01:00
|
|
|
/* FIXME - there are more usb_alloc routines for dma correctness.
|
|
|
|
Needed? */
|
|
|
|
dev->ring_buffer =
|
|
|
|
kmalloc((true_size * sizeof(struct alphatrack_icmd)), GFP_KERNEL);
|
2008-12-18 02:13:45 +01:00
|
|
|
|
|
|
|
if (!dev->ring_buffer) {
|
2009-01-20 15:33:21 +01:00
|
|
|
dev_err(&intf->dev,
|
|
|
|
"Couldn't allocate input ring_buffer of size %d\n",
|
|
|
|
true_size);
|
2008-12-18 02:13:45 +01:00
|
|
|
goto error;
|
|
|
|
}
|
|
|
|
|
2009-01-20 15:33:21 +01:00
|
|
|
dev->interrupt_in_buffer =
|
|
|
|
kmalloc(dev->interrupt_in_endpoint_size, GFP_KERNEL);
|
2008-12-18 02:13:45 +01:00
|
|
|
|
|
|
|
if (!dev->interrupt_in_buffer) {
|
|
|
|
dev_err(&intf->dev, "Couldn't allocate interrupt_in_buffer\n");
|
|
|
|
goto error;
|
|
|
|
}
|
|
|
|
dev->oldi_buffer = kmalloc(dev->interrupt_in_endpoint_size, GFP_KERNEL);
|
|
|
|
if (!dev->oldi_buffer) {
|
|
|
|
dev_err(&intf->dev, "Couldn't allocate old buffer\n");
|
|
|
|
goto error;
|
|
|
|
}
|
|
|
|
dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL);
|
|
|
|
if (!dev->interrupt_in_urb) {
|
|
|
|
dev_err(&intf->dev, "Couldn't allocate interrupt_in_urb\n");
|
|
|
|
goto error;
|
|
|
|
}
|
|
|
|
|
2009-01-20 15:33:21 +01:00
|
|
|
dev->interrupt_out_endpoint_size =
|
|
|
|
dev->interrupt_out_endpoint ? le16_to_cpu(dev->
|
|
|
|
interrupt_out_endpoint->
|
|
|
|
wMaxPacketSize) : udev->
|
|
|
|
descriptor.bMaxPacketSize0;
|
2008-12-18 02:13:45 +01:00
|
|
|
|
2009-01-20 15:33:21 +01:00
|
|
|
if (dev->interrupt_out_endpoint_size != 64)
|
|
|
|
dev_warn(&intf->dev,
|
|
|
|
"Interrupt out endpoint size is not 64!)\n");
|
2008-12-18 02:13:45 +01:00
|
|
|
|
2009-01-20 15:33:21 +01:00
|
|
|
if (write_buffer_size == 0)
|
|
|
|
write_buffer_size = WRITE_BUFFER_SIZE;
|
|
|
|
true_size = min(write_buffer_size, WRITE_BUFFER_SIZE);
|
2008-12-18 02:13:45 +01:00
|
|
|
|
2009-01-20 15:33:21 +01:00
|
|
|
dev->interrupt_out_buffer =
|
|
|
|
kmalloc(true_size * dev->interrupt_out_endpoint_size, GFP_KERNEL);
|
2008-12-18 02:13:45 +01:00
|
|
|
|
|
|
|
if (!dev->interrupt_out_buffer) {
|
|
|
|
dev_err(&intf->dev, "Couldn't allocate interrupt_out_buffer\n");
|
|
|
|
goto error;
|
|
|
|
}
|
|
|
|
|
2009-01-20 15:33:21 +01:00
|
|
|
dev->write_buffer =
|
2010-11-01 18:12:05 +01:00
|
|
|
kmalloc(true_size * sizeof(struct alphatrack_ocmd), GFP_KERNEL);
|
2008-12-18 02:13:45 +01:00
|
|
|
|
|
|
|
if (!dev->write_buffer) {
|
2010-03-07 15:19:39 +01:00
|
|
|
dev_err(&intf->dev, "Couldn't allocate write_buffer\n");
|
2008-12-18 02:13:45 +01:00
|
|
|
goto error;
|
|
|
|
}
|
|
|
|
|
|
|
|
dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL);
|
|
|
|
if (!dev->interrupt_out_urb) {
|
|
|
|
dev_err(&intf->dev, "Couldn't allocate interrupt_out_urb\n");
|
|
|
|
goto error;
|
|
|
|
}
|
2009-01-20 15:33:21 +01:00
|
|
|
dev->interrupt_in_interval =
|
|
|
|
min_interrupt_in_interval >
|
|
|
|
dev->interrupt_in_endpoint->
|
|
|
|
bInterval ? min_interrupt_in_interval : dev->interrupt_in_endpoint->
|
|
|
|
bInterval;
|
2008-12-18 02:13:45 +01:00
|
|
|
if (dev->interrupt_out_endpoint)
|
2009-01-20 15:33:21 +01:00
|
|
|
dev->interrupt_out_interval =
|
|
|
|
min_interrupt_out_interval >
|
|
|
|
dev->interrupt_out_endpoint->
|
|
|
|
bInterval ? min_interrupt_out_interval : dev->
|
|
|
|
interrupt_out_endpoint->bInterval;
|
2008-12-18 02:13:45 +01:00
|
|
|
|
|
|
|
/* we can register the device now, as it is ready */
|
|
|
|
usb_set_intfdata(intf, dev);
|
|
|
|
|
2009-01-20 15:33:21 +01:00
|
|
|
atomic_set(&dev->writes_pending, 0);
|
2008-12-18 02:13:45 +01:00
|
|
|
retval = usb_register_dev(intf, &usb_alphatrack_class);
|
|
|
|
if (retval) {
|
|
|
|
/* something prevented us from registering this driver */
|
2009-01-20 15:33:21 +01:00
|
|
|
dev_err(&intf->dev,
|
|
|
|
"Not able to get a minor for this device.\n");
|
2008-12-18 02:13:45 +01:00
|
|
|
usb_set_intfdata(intf, NULL);
|
|
|
|
goto error;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* let the user know what node this device is now attached to */
|
2009-01-20 15:33:21 +01:00
|
|
|
dev_info(&intf->dev,
|
|
|
|
"Alphatrack Device #%d now attached to major %d minor %d\n",
|
|
|
|
(intf->minor - USB_ALPHATRACK_MINOR_BASE), USB_MAJOR,
|
|
|
|
intf->minor);
|
2008-12-18 02:13:45 +01:00
|
|
|
|
|
|
|
exit:
|
|
|
|
return retval;
|
|
|
|
|
|
|
|
error:
|
|
|
|
usb_alphatrack_delete(dev);
|
|
|
|
|
|
|
|
return retval;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* usb_alphatrack_disconnect
|
|
|
|
*
|
|
|
|
* Called by the usb core when the device is removed from the system.
|
|
|
|
*/
|
|
|
|
static void usb_alphatrack_disconnect(struct usb_interface *intf)
|
|
|
|
{
|
|
|
|
struct usb_alphatrack *dev;
|
|
|
|
int minor;
|
|
|
|
|
|
|
|
mutex_lock(&disconnect_mutex);
|
|
|
|
|
|
|
|
dev = usb_get_intfdata(intf);
|
|
|
|
usb_set_intfdata(intf, NULL);
|
|
|
|
|
2010-03-09 07:15:33 +01:00
|
|
|
mutex_lock(&dev->mtx);
|
2008-12-18 02:13:45 +01:00
|
|
|
|
|
|
|
minor = intf->minor;
|
|
|
|
|
|
|
|
/* give back our minor */
|
|
|
|
usb_deregister_dev(intf, &usb_alphatrack_class);
|
|
|
|
|
|
|
|
/* if the device is not opened, then we clean up right now */
|
|
|
|
if (!dev->open_count) {
|
2010-03-09 07:15:33 +01:00
|
|
|
mutex_unlock(&dev->mtx);
|
2008-12-18 02:13:45 +01:00
|
|
|
usb_alphatrack_delete(dev);
|
|
|
|
} else {
|
|
|
|
dev->intf = NULL;
|
2010-03-09 07:15:33 +01:00
|
|
|
mutex_unlock(&dev->mtx);
|
2008-12-18 02:13:45 +01:00
|
|
|
}
|
|
|
|
|
2009-01-20 15:33:21 +01:00
|
|
|
atomic_set(&dev->writes_pending, 0);
|
2008-12-18 02:13:45 +01:00
|
|
|
mutex_unlock(&disconnect_mutex);
|
|
|
|
|
|
|
|
dev_info(&intf->dev, "Alphatrack Surface #%d now disconnected\n",
|
|
|
|
(minor - USB_ALPHATRACK_MINOR_BASE));
|
|
|
|
}
|
|
|
|
|
|
|
|
/* usb specific object needed to register this driver with the usb subsystem */
|
|
|
|
static struct usb_driver usb_alphatrack_driver = {
|
2009-01-20 15:33:21 +01:00
|
|
|
.name = "alphatrack",
|
|
|
|
.probe = usb_alphatrack_probe,
|
|
|
|
.disconnect = usb_alphatrack_disconnect,
|
|
|
|
.id_table = usb_alphatrack_table,
|
2008-12-18 02:13:45 +01:00
|
|
|
};
|
|
|
|
|
|
|
|
/**
|
|
|
|
* usb_alphatrack_init
|
|
|
|
*/
|
|
|
|
static int __init usb_alphatrack_init(void)
|
|
|
|
{
|
|
|
|
int retval;
|
|
|
|
|
|
|
|
/* register this driver with the USB subsystem */
|
|
|
|
retval = usb_register(&usb_alphatrack_driver);
|
|
|
|
if (retval)
|
2009-01-20 15:33:21 +01:00
|
|
|
err("usb_register failed for the " __FILE__
|
|
|
|
" driver. Error number %d\n", retval);
|
2008-12-18 02:13:45 +01:00
|
|
|
|
|
|
|
return retval;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* usb_alphatrack_exit
|
|
|
|
*/
|
|
|
|
static void __exit usb_alphatrack_exit(void)
|
|
|
|
{
|
|
|
|
/* deregister this driver with the USB subsystem */
|
|
|
|
usb_deregister(&usb_alphatrack_driver);
|
|
|
|
}
|
|
|
|
|
|
|
|
module_init(usb_alphatrack_init);
|
|
|
|
module_exit(usb_alphatrack_exit);
|