896 lines
23 KiB
C
896 lines
23 KiB
C
/*
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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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#include <linux/uaccess.h>
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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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/* FIXME 176 - is another driver's minor - apply for that */
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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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static const struct usb_device_id usb_alphatrack_table[] = {
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{USB_DEVICE(VENDOR_ID, PRODUCT_ID)},
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{} /* Terminating entry */
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};
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MODULE_DEVICE_TABLE(usb, usb_alphatrack_table);
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MODULE_VERSION("0.41");
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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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#define ALPHATRACK_DEBUG 0
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static int debug = ALPHATRACK_DEBUG;
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/* Use our own dbg macro */
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#define dbg_info(dev, format, arg...) do \
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{ if (debug) dev_info(dev , format , ## arg); } while (0)
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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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module_param(ring_buffer_size, int, S_IRUGO);
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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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module_param(write_buffer_size, int, S_IRUGO);
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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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MODULE_PARM_DESC(min_interrupt_in_interval,
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"Minimum interrupt in interval in ms");
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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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MODULE_PARM_DESC(min_interrupt_out_interval,
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"Minimum interrupt out interval in ms");
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/* Structure to hold all of our device specific stuff */
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struct usb_alphatrack {
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struct mutex mtx; /* locks this structure */
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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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atomic_t writes_pending;
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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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};
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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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kfree(dev); /* fixme oldi_buffer */
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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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urb->status == -ECONNRESET || urb->status == -ESHUTDOWN) {
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goto exit;
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} else {
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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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}
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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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"Urb length was %d bytes!!"
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"Do something intelligent\n", urb->actual_length);
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} else {
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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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}
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memcpy(dev->oldi_buffer, dev->interrupt_in_buffer,
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INPUT_CMD_SIZE);
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#if SUPPRESS_EXTRA_OFFLINE_EVENTS
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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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/* Always pass one offline event up the stack */
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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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#endif
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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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if (next_ring_head != dev->ring_tail) {
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memcpy(&((*dev->ring_buffer)[dev->ring_head]),
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dev->interrupt_in_buffer, urb->actual_length);
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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",
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__func__, urb->status);
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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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* 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);
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interface = usb_find_interface(&usb_alphatrack_driver, subminor);
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if (!interface) {
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err("%s - error, can't find device for minor %d\n",
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__func__, subminor);
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retval = -ENODEV;
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goto unlock_disconnect_exit;
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}
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dev = usb_get_intfdata(interface);
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if (!dev) {
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retval = -ENODEV;
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goto unlock_disconnect_exit;
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}
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/* lock this device */
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if (mutex_lock_interruptible(&dev->mtx)) {
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retval = -ERESTARTSYS;
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goto unlock_disconnect_exit;
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}
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/* allow opening only once */
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if (dev->open_count) {
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retval = -EBUSY;
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goto unlock_exit;
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}
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dev->open_count = 1;
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/* initialize in direction */
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dev->ring_head = 0;
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dev->ring_tail = 0;
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usb_fill_int_urb(dev->interrupt_in_urb,
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interface_to_usbdev(interface),
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usb_rcvintpipe(interface_to_usbdev(interface),
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dev->interrupt_in_endpoint->
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bEndpointAddress),
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dev->interrupt_in_buffer,
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dev->interrupt_in_endpoint_size,
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usb_alphatrack_interrupt_in_callback, dev,
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dev->interrupt_in_interval);
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dev->interrupt_in_running = 1;
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dev->interrupt_in_done = 0;
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dev->enable = 1;
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dev->offline = 0;
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retval = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL);
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if (retval) {
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dev_err(&interface->dev,
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"Couldn't submit interrupt_in_urb %d\n", retval);
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dev->interrupt_in_running = 0;
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dev->open_count = 0;
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goto unlock_exit;
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}
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/* save device in the file's private structure */
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file->private_data = dev;
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unlock_exit:
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mutex_unlock(&dev->mtx);
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unlock_disconnect_exit:
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mutex_unlock(&disconnect_mutex);
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return retval;
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}
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/**
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* usb_alphatrack_release
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*/
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static int usb_alphatrack_release(struct inode *inode, struct file *file)
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{
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struct usb_alphatrack *dev;
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int retval = 0;
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dev = file->private_data;
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if (dev == NULL) {
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retval = -ENODEV;
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goto exit;
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}
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if (mutex_lock_interruptible(&dev->mtx)) {
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retval = -ERESTARTSYS;
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goto exit;
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}
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if (dev->open_count != 1) {
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retval = -ENODEV;
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goto unlock_exit;
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}
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if (dev->intf == NULL) {
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/* the device was unplugged before the file was released */
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mutex_unlock(&dev->mtx);
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/* unlock here as usb_alphatrack_delete frees dev */
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usb_alphatrack_delete(dev);
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retval = -ENODEV;
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goto exit;
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}
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/* wait until write transfer is finished */
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if (dev->interrupt_out_busy)
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wait_event_interruptible_timeout(dev->write_wait,
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!dev->interrupt_out_busy,
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2 * HZ);
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usb_alphatrack_abort_transfers(dev);
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dev->open_count = 0;
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unlock_exit:
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mutex_unlock(&dev->mtx);
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exit:
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return retval;
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}
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/**
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* usb_alphatrack_poll
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*/
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static unsigned int usb_alphatrack_poll(struct file *file, poll_table * wait)
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{
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struct usb_alphatrack *dev;
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unsigned int mask = 0;
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dev = file->private_data;
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poll_wait(file, &dev->read_wait, wait);
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poll_wait(file, &dev->write_wait, wait);
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if (dev->ring_head != dev->ring_tail)
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mask |= POLLIN | POLLRDNORM;
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if (!dev->interrupt_out_busy)
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mask |= POLLOUT | POLLWRNORM;
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return mask;
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}
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/**
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* usb_alphatrack_read
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*/
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static ssize_t usb_alphatrack_read(struct file *file, char __user *buffer,
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size_t count, loff_t *ppos)
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{
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struct usb_alphatrack *dev;
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int retval = 0;
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int c = 0;
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dev = file->private_data;
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/* verify that we actually have some data to read */
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if (count == 0)
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goto exit;
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/* lock this object */
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if (mutex_lock_interruptible(&dev->mtx)) {
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retval = -ERESTARTSYS;
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goto exit;
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}
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/* verify that the device wasn't unplugged */
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if (dev->intf == NULL) {
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retval = -ENODEV;
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err("No device or device unplugged %d\n", retval);
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goto unlock_exit;
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}
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while (dev->ring_head == dev->ring_tail) {
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if (file->f_flags & O_NONBLOCK) {
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retval = -EAGAIN;
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goto unlock_exit;
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}
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dev->interrupt_in_done = 0;
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retval =
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wait_event_interruptible(dev->read_wait,
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dev->interrupt_in_done);
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if (retval < 0)
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goto unlock_exit;
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}
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alphatrack_ocmd_info(&dev->intf->dev,
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&(*dev->ring_buffer)[dev->ring_tail].cmd, "%s",
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": copying to userspace");
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c = 0;
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while ((c < count) && (dev->ring_tail != dev->ring_head)) {
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if (copy_to_user
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(&buffer[c], &(*dev->ring_buffer)[dev->ring_tail],
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INPUT_CMD_SIZE)) {
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retval = -EFAULT;
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goto unlock_exit;
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}
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dev->ring_tail = (dev->ring_tail + 1) % ring_buffer_size;
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c += INPUT_CMD_SIZE;
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|
dbg_info(&dev->intf->dev, "%s: head, tail are %x, %x\n",
|
|
__func__, dev->ring_head, dev->ring_tail);
|
|
}
|
|
retval = c;
|
|
|
|
unlock_exit:
|
|
/* unlock the device */
|
|
mutex_unlock(&dev->mtx);
|
|
|
|
exit:
|
|
return retval;
|
|
}
|
|
|
|
/**
|
|
* usb_alphatrack_write
|
|
*/
|
|
static ssize_t usb_alphatrack_write(struct file *file,
|
|
const char __user *buffer, size_t count,
|
|
loff_t *ppos)
|
|
{
|
|
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 */
|
|
if (mutex_lock_interruptible(&dev->mtx)) {
|
|
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;
|
|
}
|
|
retval =
|
|
wait_event_interruptible(dev->write_wait,
|
|
!dev->interrupt_out_busy);
|
|
if (retval < 0)
|
|
goto unlock_exit;
|
|
}
|
|
|
|
/* write the data into interrupt_out_buffer from userspace */
|
|
/* FIXME - if you write more than 12 bytes this breaks */
|
|
bytes_to_write =
|
|
min(count, write_buffer_size * dev->interrupt_out_endpoint_size);
|
|
if (bytes_to_write < count)
|
|
dev_warn(&dev->intf->dev,
|
|
"Write buffer overflow, %zd bytes dropped\n",
|
|
count - bytes_to_write);
|
|
|
|
dbg_info(&dev->intf->dev, "%s: count = %zd, bytes_to_write = %zd\n",
|
|
__func__, count, bytes_to_write);
|
|
|
|
if (copy_from_user(dev->interrupt_out_buffer, buffer, bytes_to_write)) {
|
|
retval = -EFAULT;
|
|
goto unlock_exit;
|
|
}
|
|
|
|
if (dev->interrupt_out_endpoint == NULL) {
|
|
err("Endpoint should not be be null!\n");
|
|
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),
|
|
dev->interrupt_out_endpoint->
|
|
bEndpointAddress),
|
|
dev->interrupt_out_buffer, bytes_to_write,
|
|
usb_alphatrack_interrupt_out_callback, dev,
|
|
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 */
|
|
mutex_unlock(&dev->mtx);
|
|
|
|
exit:
|
|
return retval;
|
|
}
|
|
|
|
/* file operations needed when we register this driver */
|
|
static const struct file_operations usb_alphatrack_fops = {
|
|
.owner = THIS_MODULE,
|
|
.read = usb_alphatrack_read,
|
|
.write = usb_alphatrack_write,
|
|
.open = usb_alphatrack_open,
|
|
.release = usb_alphatrack_release,
|
|
.poll = usb_alphatrack_poll,
|
|
};
|
|
|
|
/*
|
|
* 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 = {
|
|
.name = "alphatrack%d",
|
|
.fops = &usb_alphatrack_fops,
|
|
.minor_base = USB_ALPHATRACK_MINOR_BASE,
|
|
};
|
|
|
|
/**
|
|
* usb_alphatrack_probe
|
|
*
|
|
* Called by the usb core when a new device is connected that it thinks
|
|
* this driver might be interested in.
|
|
*/
|
|
static int usb_alphatrack_probe(struct usb_interface *intf,
|
|
const struct usb_device_id *id)
|
|
{
|
|
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;
|
|
|
|
/* allocate memory for our device state and initialize it */
|
|
|
|
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
|
|
if (dev == NULL) {
|
|
dev_err(&intf->dev, "Out of memory\n");
|
|
goto exit;
|
|
}
|
|
mutex_init(&dev->mtx);
|
|
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)
|
|
dev_warn(&intf->dev,
|
|
"Interrupt out endpoint not found"
|
|
"(using control endpoint instead)\n");
|
|
|
|
dev->interrupt_in_endpoint_size =
|
|
le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize);
|
|
|
|
if (dev->interrupt_in_endpoint_size != 64)
|
|
dev_warn(&intf->dev, "Interrupt in endpoint size is not 64!\n");
|
|
|
|
if (ring_buffer_size == 0)
|
|
ring_buffer_size = RING_BUFFER_SIZE;
|
|
|
|
true_size = min(ring_buffer_size, RING_BUFFER_SIZE);
|
|
|
|
/* FIXME - there are more usb_alloc routines for dma correctness.
|
|
Needed? */
|
|
dev->ring_buffer =
|
|
kmalloc((true_size * sizeof(struct alphatrack_icmd)), GFP_KERNEL);
|
|
|
|
if (!dev->ring_buffer) {
|
|
dev_err(&intf->dev,
|
|
"Couldn't allocate input ring_buffer of size %d\n",
|
|
true_size);
|
|
goto error;
|
|
}
|
|
|
|
dev->interrupt_in_buffer =
|
|
kmalloc(dev->interrupt_in_endpoint_size, GFP_KERNEL);
|
|
|
|
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;
|
|
}
|
|
|
|
dev->interrupt_out_endpoint_size =
|
|
dev->interrupt_out_endpoint ? le16_to_cpu(dev->
|
|
interrupt_out_endpoint->
|
|
wMaxPacketSize) : udev->
|
|
descriptor.bMaxPacketSize0;
|
|
|
|
if (dev->interrupt_out_endpoint_size != 64)
|
|
dev_warn(&intf->dev,
|
|
"Interrupt out endpoint size is not 64!)\n");
|
|
|
|
if (write_buffer_size == 0)
|
|
write_buffer_size = WRITE_BUFFER_SIZE;
|
|
true_size = min(write_buffer_size, WRITE_BUFFER_SIZE);
|
|
|
|
dev->interrupt_out_buffer =
|
|
kmalloc(true_size * dev->interrupt_out_endpoint_size, GFP_KERNEL);
|
|
|
|
if (!dev->interrupt_out_buffer) {
|
|
dev_err(&intf->dev, "Couldn't allocate interrupt_out_buffer\n");
|
|
goto error;
|
|
}
|
|
|
|
dev->write_buffer =
|
|
kmalloc(sizeof(struct alphatrack_ocmd) * true_size, GFP_KERNEL);
|
|
|
|
if (!dev->write_buffer) {
|
|
dev_err(&intf->dev, "Couldn't allocate write_buffer\n");
|
|
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;
|
|
}
|
|
dev->interrupt_in_interval =
|
|
min_interrupt_in_interval >
|
|
dev->interrupt_in_endpoint->
|
|
bInterval ? min_interrupt_in_interval : dev->interrupt_in_endpoint->
|
|
bInterval;
|
|
if (dev->interrupt_out_endpoint)
|
|
dev->interrupt_out_interval =
|
|
min_interrupt_out_interval >
|
|
dev->interrupt_out_endpoint->
|
|
bInterval ? min_interrupt_out_interval : dev->
|
|
interrupt_out_endpoint->bInterval;
|
|
|
|
/* we can register the device now, as it is ready */
|
|
usb_set_intfdata(intf, dev);
|
|
|
|
atomic_set(&dev->writes_pending, 0);
|
|
retval = usb_register_dev(intf, &usb_alphatrack_class);
|
|
if (retval) {
|
|
/* something prevented us from registering this driver */
|
|
dev_err(&intf->dev,
|
|
"Not able to get a minor for this device.\n");
|
|
usb_set_intfdata(intf, NULL);
|
|
goto error;
|
|
}
|
|
|
|
/* let the user know what node this device is now attached to */
|
|
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);
|
|
|
|
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);
|
|
|
|
mutex_lock(&dev->mtx);
|
|
|
|
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) {
|
|
mutex_unlock(&dev->mtx);
|
|
usb_alphatrack_delete(dev);
|
|
} else {
|
|
dev->intf = NULL;
|
|
mutex_unlock(&dev->mtx);
|
|
}
|
|
|
|
atomic_set(&dev->writes_pending, 0);
|
|
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 = {
|
|
.name = "alphatrack",
|
|
.probe = usb_alphatrack_probe,
|
|
.disconnect = usb_alphatrack_disconnect,
|
|
.id_table = usb_alphatrack_table,
|
|
};
|
|
|
|
/**
|
|
* 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)
|
|
err("usb_register failed for the " __FILE__
|
|
" driver. Error number %d\n", retval);
|
|
|
|
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);
|