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@@ -1,973 +0,0 @@
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-/*
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- * Frontier Designs Tranzport 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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-/*
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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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-
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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 17 commands for the tranzport. 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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-
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-#include <linux/kernel.h>
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-#include <linux/errno.h>
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-#include <linux/slab.h>
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-#include <linux/module.h>
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-#include <linux/mutex.h>
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-
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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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-
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-/* Define these values to match your devices */
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-#define VENDOR_ID 0x165b
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-#define PRODUCT_ID 0x8101
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-
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-#ifdef CONFIG_USB_DYNAMIC_MINORS
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-#define USB_TRANZPORT_MINOR_BASE 0
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-#else /* FIXME 177- is the another driver's minor - apply for a minor soon */
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-#define USB_TRANZPORT_MINOR_BASE 177
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-#endif
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-
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-/* table of devices that work with this driver */
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-static const struct usb_device_id usb_tranzport_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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-
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-MODULE_DEVICE_TABLE(usb, usb_tranzport_table);
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-MODULE_VERSION("0.35");
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-MODULE_AUTHOR("Mike Taht <m@taht.net>");
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-MODULE_DESCRIPTION("Tranzport USB Driver");
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-MODULE_LICENSE("GPL");
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-MODULE_SUPPORTED_DEVICE("Frontier Designs Tranzport Control Surface");
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-
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-#define SUPPRESS_EXTRA_OFFLINE_EVENTS 1
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-#define COMPRESS_WHEEL_EVENTS 1
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-#define BUFFERED_READS 1
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-#define RING_BUFFER_SIZE 1000
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-#define WRITE_BUFFER_SIZE 34
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-#define TRANZPORT_USB_TIMEOUT 10
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-#define TRANZPORT_DEBUG 0
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-
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-static int debug = TRANZPORT_DEBUG;
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-
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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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-
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-/* Module parameters */
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-
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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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-
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-/*
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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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-
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-static int ring_buffer_size = RING_BUFFER_SIZE;
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-
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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 in reports");
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-
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-/*
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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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-/*
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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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-
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-static int min_interrupt_in_interval = TRANZPORT_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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-
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-static int min_interrupt_out_interval = TRANZPORT_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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-
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-struct tranzport_cmd {
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- unsigned char cmd[8];
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-};
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-
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-/* Structure to hold all of our device specific stuff */
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-
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-struct usb_tranzport {
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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 opened */
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- struct tranzport_cmd (*ring_buffer)[RING_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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- 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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-
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- /* Sysfs support */
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-
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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 compress_wheel; /* flag to compress wheel events */
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-};
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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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-
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-static struct usb_driver usb_tranzport_driver;
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-
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-/**
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- * usb_tranzport_abort_transfers
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- * aborts transfers and frees associated data structures
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- */
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-static void usb_tranzport_abort_transfers(struct usb_tranzport *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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-#define show_int(value) \
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- static ssize_t value##_show(struct device *dev, \
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- struct device_attribute *attr, char *buf) \
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- { \
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- struct usb_interface *intf = to_usb_interface(dev); \
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- struct usb_tranzport *t = usb_get_intfdata(intf); \
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- return sprintf(buf, "%d\n", t->value); \
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- } \
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- static DEVICE_ATTR_RO(value)
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-
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-#define show_set_int(value) \
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- static ssize_t value##_show(struct device *dev, \
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- struct device_attribute *attr, char *buf) \
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- { \
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- struct usb_interface *intf = to_usb_interface(dev); \
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- struct usb_tranzport *t = usb_get_intfdata(intf); \
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- return sprintf(buf, "%d\n", t->value); \
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- } \
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- static ssize_t value##_store(struct device *dev, \
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- struct device_attribute *attr, \
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- const char *buf, size_t count) \
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- { \
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- struct usb_interface *intf = to_usb_interface(dev); \
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- struct usb_tranzport *t = usb_get_intfdata(intf); \
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- unsigned long temp; \
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- if (kstrtoul(buf, 10, &temp)) \
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- return -EINVAL; \
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- t->value = temp; \
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- return count; \
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- } \
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- static DEVICE_ATTR_RW(value)
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-
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-show_int(enable);
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-show_int(offline);
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-show_set_int(compress_wheel);
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-
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-/**
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- * usb_tranzport_delete
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- */
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-static void usb_tranzport_delete(struct usb_tranzport *dev)
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-{
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- usb_tranzport_abort_transfers(dev);
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- if (dev->intf != NULL) {
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- device_remove_file(&dev->intf->dev, &dev_attr_enable);
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- device_remove_file(&dev->intf->dev, &dev_attr_offline);
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- device_remove_file(&dev->intf->dev, &dev_attr_compress_wheel);
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- }
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-
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- /* free data structures */
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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);
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-}
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-
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-/**
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- * usb_tranzport_interrupt_in_callback
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- */
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-
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-static void usb_tranzport_interrupt_in_callback(struct urb *urb)
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-{
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- struct usb_tranzport *dev = urb->context;
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- unsigned int next_ring_head;
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- int retval = -1;
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-
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- if (urb->status) {
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- if (urb->status == -ENOENT ||
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- urb->status == -ECONNRESET ||
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- 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",
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- __func__, urb->status);
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- goto resubmit; /* maybe we can recover */
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- }
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- }
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-
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- if (urb->actual_length != 8) {
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- dev_warn(&dev->intf->dev,
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- "Urb length was %d bytes!! Do something intelligent\n",
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- urb->actual_length);
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- } else {
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- dbg_info(&dev->intf->dev,
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- "%s: received: %02x%02x%02x%02x%02x%02x%02x%02x\n",
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- __func__, dev->interrupt_in_buffer[0],
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- dev->interrupt_in_buffer[1],
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- dev->interrupt_in_buffer[2],
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- dev->interrupt_in_buffer[3],
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- dev->interrupt_in_buffer[4],
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- dev->interrupt_in_buffer[5],
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- dev->interrupt_in_buffer[6],
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- dev->interrupt_in_buffer[7]);
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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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-
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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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-
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-#endif /* SUPPRESS_EXTRA_OFFLINE_EVENTS */
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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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-
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- next_ring_head = (dev->ring_head + 1) % ring_buffer_size;
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-
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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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-
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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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-
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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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-/**
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- * usb_tranzport_interrupt_out_callback
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- */
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-static void usb_tranzport_interrupt_out_callback(struct urb *urb)
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-{
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- struct usb_tranzport *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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-
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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_tranzport_open
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- */
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-static int usb_tranzport_open(struct inode *inode, struct file *file)
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-{
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- struct usb_tranzport *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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-
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- nonseekable_open(inode, file);
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- subminor = iminor(inode);
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-
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- mutex_lock(&disconnect_mutex);
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-
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- interface = usb_find_interface(&usb_tranzport_driver, subminor);
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-
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- if (!interface) {
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- pr_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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-
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- dev = usb_get_intfdata(interface);
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-
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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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-
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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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-
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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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-
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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_tranzport_interrupt_in_callback, dev,
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- dev->interrupt_in_interval);
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-
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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;
|
|
|
- dev->compress_wheel = 1;
|
|
|
-
|
|
|
- retval = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL);
|
|
|
- if (retval) {
|
|
|
- dev_err(&interface->dev,
|
|
|
- "Couldn't submit interrupt_in_urb %d\n", retval);
|
|
|
- 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:
|
|
|
- mutex_unlock(&dev->mtx);
|
|
|
-
|
|
|
-unlock_disconnect_exit:
|
|
|
- mutex_unlock(&disconnect_mutex);
|
|
|
-
|
|
|
- return retval;
|
|
|
-}
|
|
|
-
|
|
|
-/**
|
|
|
- * usb_tranzport_release
|
|
|
- */
|
|
|
-static int usb_tranzport_release(struct inode *inode, struct file *file)
|
|
|
-{
|
|
|
- struct usb_tranzport *dev;
|
|
|
- int retval = 0;
|
|
|
-
|
|
|
- dev = file->private_data;
|
|
|
-
|
|
|
- if (dev == NULL) {
|
|
|
- retval = -ENODEV;
|
|
|
- goto exit;
|
|
|
- }
|
|
|
-
|
|
|
- if (mutex_lock_interruptible(&dev->mtx)) {
|
|
|
- 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 */
|
|
|
- mutex_unlock(&dev->mtx);
|
|
|
- /* unlock here as usb_tranzport_delete frees dev */
|
|
|
- usb_tranzport_delete(dev);
|
|
|
- retval = -ENODEV;
|
|
|
- goto exit;
|
|
|
- }
|
|
|
-
|
|
|
- /* wait until write transfer is finished */
|
|
|
- if (dev->interrupt_out_busy)
|
|
|
- wait_event_interruptible_timeout(dev->write_wait,
|
|
|
- !dev->interrupt_out_busy,
|
|
|
- 2 * HZ);
|
|
|
- usb_tranzport_abort_transfers(dev);
|
|
|
- dev->open_count = 0;
|
|
|
-
|
|
|
-unlock_exit:
|
|
|
- mutex_unlock(&dev->mtx);
|
|
|
-
|
|
|
-exit:
|
|
|
- return retval;
|
|
|
-}
|
|
|
-
|
|
|
-/**
|
|
|
- * usb_tranzport_poll
|
|
|
- */
|
|
|
-static unsigned int usb_tranzport_poll(struct file *file, poll_table *wait)
|
|
|
-{
|
|
|
- struct usb_tranzport *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_tranzport_read
|
|
|
- */
|
|
|
-
|
|
|
-static ssize_t usb_tranzport_read(struct file *file, char __user *buffer,
|
|
|
- size_t count, loff_t *ppos)
|
|
|
-{
|
|
|
- struct usb_tranzport *dev;
|
|
|
- int retval = 0;
|
|
|
-#if BUFFERED_READS
|
|
|
- int c = 0;
|
|
|
-#endif
|
|
|
-#if COMPRESS_WHEEL_EVENTS
|
|
|
- signed char oldwheel;
|
|
|
- signed char newwheel;
|
|
|
- int cancompress = 1;
|
|
|
- int next_tail;
|
|
|
-#endif
|
|
|
-
|
|
|
- /* do I have such a thing as a null event? */
|
|
|
-
|
|
|
- dev = file->private_data;
|
|
|
-
|
|
|
- /* verify that we actually have some data to read */
|
|
|
- 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;
|
|
|
- pr_err("%s: No device or device unplugged %d\n",
|
|
|
- __func__, retval);
|
|
|
- goto unlock_exit;
|
|
|
- }
|
|
|
-
|
|
|
- while (dev->ring_head == dev->ring_tail) {
|
|
|
-
|
|
|
- if (file->f_flags & O_NONBLOCK) {
|
|
|
- retval = -EAGAIN;
|
|
|
- goto unlock_exit;
|
|
|
- }
|
|
|
- /* tiny race - FIXME: make atomic? */
|
|
|
- /* atomic_cmp_exchange(&dev->interrupt_in_done,0,0); */
|
|
|
- dev->interrupt_in_done = 0;
|
|
|
- retval = wait_event_interruptible(dev->read_wait,
|
|
|
- dev->interrupt_in_done);
|
|
|
- if (retval < 0)
|
|
|
- goto unlock_exit;
|
|
|
- }
|
|
|
-
|
|
|
- dbg_info(&dev->intf->dev,
|
|
|
- "%s: copying to userspace: %02x%02x%02x%02x%02x%02x%02x%02x\n",
|
|
|
- __func__,
|
|
|
- (*dev->ring_buffer)[dev->ring_tail].cmd[0],
|
|
|
- (*dev->ring_buffer)[dev->ring_tail].cmd[1],
|
|
|
- (*dev->ring_buffer)[dev->ring_tail].cmd[2],
|
|
|
- (*dev->ring_buffer)[dev->ring_tail].cmd[3],
|
|
|
- (*dev->ring_buffer)[dev->ring_tail].cmd[4],
|
|
|
- (*dev->ring_buffer)[dev->ring_tail].cmd[5],
|
|
|
- (*dev->ring_buffer)[dev->ring_tail].cmd[6],
|
|
|
- (*dev->ring_buffer)[dev->ring_tail].cmd[7]);
|
|
|
-
|
|
|
-#if BUFFERED_READS
|
|
|
- c = 0;
|
|
|
- while ((c < count) && (dev->ring_tail != dev->ring_head)) {
|
|
|
-
|
|
|
-#if COMPRESS_WHEEL_EVENTS
|
|
|
- next_tail = (dev->ring_tail+1) % ring_buffer_size;
|
|
|
- if (dev->compress_wheel)
|
|
|
- cancompress = 1;
|
|
|
- while (dev->ring_head != next_tail && cancompress == 1) {
|
|
|
- newwheel = (*dev->ring_buffer)[next_tail].cmd[6];
|
|
|
- oldwheel = (*dev->ring_buffer)[dev->ring_tail].cmd[6];
|
|
|
- /* if both are wheel events, and
|
|
|
- * no buttons have changes (FIXME, do I have to check?),
|
|
|
- * and we are the same sign, we can compress +- 7F
|
|
|
- */
|
|
|
- dbg_info(&dev->intf->dev,
|
|
|
- "%s: trying to compress: %02x%02x%02x%02x%02x%02x%02x%02x\n",
|
|
|
- __func__,
|
|
|
- (*dev->ring_buffer)[dev->ring_tail].cmd[0],
|
|
|
- (*dev->ring_buffer)[dev->ring_tail].cmd[1],
|
|
|
- (*dev->ring_buffer)[dev->ring_tail].cmd[2],
|
|
|
- (*dev->ring_buffer)[dev->ring_tail].cmd[3],
|
|
|
- (*dev->ring_buffer)[dev->ring_tail].cmd[4],
|
|
|
- (*dev->ring_buffer)[dev->ring_tail].cmd[5],
|
|
|
- (*dev->ring_buffer)[dev->ring_tail].cmd[6],
|
|
|
- (*dev->ring_buffer)[dev->ring_tail].cmd[7]);
|
|
|
-
|
|
|
- if (((*dev->ring_buffer)[dev->ring_tail].cmd[6] != 0 &&
|
|
|
- (*dev->ring_buffer)[next_tail].cmd[6] != 0) &&
|
|
|
- ((newwheel > 0 && oldwheel > 0) ||
|
|
|
- (newwheel < 0 && oldwheel < 0)) &&
|
|
|
- ((*dev->ring_buffer)[dev->ring_tail].cmd[2] ==
|
|
|
- (*dev->ring_buffer)[next_tail].cmd[2]) &&
|
|
|
- ((*dev->ring_buffer)[dev->ring_tail].cmd[3] ==
|
|
|
- (*dev->ring_buffer)[next_tail].cmd[3]) &&
|
|
|
- ((*dev->ring_buffer)[dev->ring_tail].cmd[4] ==
|
|
|
- (*dev->ring_buffer)[next_tail].cmd[4]) &&
|
|
|
- ((*dev->ring_buffer)[dev->ring_tail].cmd[5] ==
|
|
|
- (*dev->ring_buffer)[next_tail].cmd[5])) {
|
|
|
- dbg_info(&dev->intf->dev,
|
|
|
- "%s: should compress: "
|
|
|
- "%02x%02x%02x%02x%02x%02x%02x%02x\n",
|
|
|
- __func__,
|
|
|
- (*dev->ring_buffer)[dev->ring_tail].
|
|
|
- cmd[0],
|
|
|
- (*dev->ring_buffer)[dev->ring_tail].
|
|
|
- cmd[1],
|
|
|
- (*dev->ring_buffer)[dev->ring_tail].
|
|
|
- cmd[2],
|
|
|
- (*dev->ring_buffer)[dev->ring_tail].
|
|
|
- cmd[3],
|
|
|
- (*dev->ring_buffer)[dev->ring_tail].
|
|
|
- cmd[4],
|
|
|
- (*dev->ring_buffer)[dev->ring_tail].
|
|
|
- cmd[5],
|
|
|
- (*dev->ring_buffer)[dev->ring_tail].
|
|
|
- cmd[6],
|
|
|
- (*dev->ring_buffer)[dev->ring_tail].
|
|
|
- cmd[7]);
|
|
|
- newwheel += oldwheel;
|
|
|
- if (oldwheel > 0 && !(newwheel > 0)) {
|
|
|
- newwheel = 0x7f;
|
|
|
- cancompress = 0;
|
|
|
- }
|
|
|
- if (oldwheel < 0 && !(newwheel < 0)) {
|
|
|
- newwheel = 0x80;
|
|
|
- cancompress = 0;
|
|
|
- }
|
|
|
-
|
|
|
- (*dev->ring_buffer)[next_tail].cmd[6] =
|
|
|
- newwheel;
|
|
|
- dev->ring_tail = next_tail;
|
|
|
- next_tail =
|
|
|
- (dev->ring_tail + 1) % ring_buffer_size;
|
|
|
- } else {
|
|
|
- cancompress = 0;
|
|
|
- }
|
|
|
- }
|
|
|
-#endif /* COMPRESS_WHEEL_EVENTS */
|
|
|
- if (copy_to_user(
|
|
|
- &buffer[c],
|
|
|
- &(*dev->ring_buffer)[dev->ring_tail], 8)) {
|
|
|
- retval = -EFAULT;
|
|
|
- goto unlock_exit;
|
|
|
- }
|
|
|
- dev->ring_tail = (dev->ring_tail + 1) % ring_buffer_size;
|
|
|
- c += 8;
|
|
|
- dbg_info(&dev->intf->dev,
|
|
|
- "%s: head, tail are %x, %x\n",
|
|
|
- __func__, dev->ring_head, dev->ring_tail);
|
|
|
- }
|
|
|
- retval = c;
|
|
|
-
|
|
|
-#else
|
|
|
-/* if (copy_to_user(buffer, &(*dev->ring_buffer)[dev->ring_tail], 8)) { */
|
|
|
- retval = -EFAULT;
|
|
|
- goto unlock_exit;
|
|
|
-}
|
|
|
-
|
|
|
-dev->ring_tail = (dev->ring_tail + 1) % ring_buffer_size;
|
|
|
-dbg_info(&dev->intf->dev, "%s: head, tail are %x, %x\n",
|
|
|
- __func__, dev->ring_head, dev->ring_tail);
|
|
|
-
|
|
|
-retval = 8;
|
|
|
-#endif /* BUFFERED_READS */
|
|
|
-
|
|
|
-unlock_exit:
|
|
|
-/* unlock the device */
|
|
|
-mutex_unlock(&dev->mtx);
|
|
|
-
|
|
|
-exit:
|
|
|
-return retval;
|
|
|
-}
|
|
|
-
|
|
|
-/**
|
|
|
- * usb_tranzport_write
|
|
|
- */
|
|
|
-static ssize_t usb_tranzport_write(struct file *file,
|
|
|
- const char __user *buffer, size_t count,
|
|
|
- loff_t *ppos)
|
|
|
-{
|
|
|
- struct usb_tranzport *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;
|
|
|
- pr_err("%s: No device or device unplugged %d\n",
|
|
|
- __func__, 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 */
|
|
|
- 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) {
|
|
|
- dev_err(&dev->intf->dev, "Endpoint should not 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_tranzport_interrupt_out_callback, dev,
|
|
|
- dev->interrupt_out_interval);
|
|
|
-
|
|
|
- dev->interrupt_out_busy = 1;
|
|
|
- wmb();
|
|
|
-
|
|
|
- retval = usb_submit_urb(dev->interrupt_out_urb, GFP_KERNEL);
|
|
|
- if (retval) {
|
|
|
- dev->interrupt_out_busy = 0;
|
|
|
- dev_err(&dev->intf->dev,
|
|
|
- "Couldn't submit interrupt_out_urb %d\n", retval);
|
|
|
- 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_tranzport_fops = {
|
|
|
- .owner = THIS_MODULE,
|
|
|
- .read = usb_tranzport_read,
|
|
|
- .write = usb_tranzport_write,
|
|
|
- .open = usb_tranzport_open,
|
|
|
- .release = usb_tranzport_release,
|
|
|
- .poll = usb_tranzport_poll,
|
|
|
- .llseek = no_llseek,
|
|
|
-};
|
|
|
-
|
|
|
-/*
|
|
|
- * 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_tranzport_class = {
|
|
|
- .name = "tranzport%d",
|
|
|
- .fops = &usb_tranzport_fops,
|
|
|
- .minor_base = USB_TRANZPORT_MINOR_BASE,
|
|
|
-};
|
|
|
-
|
|
|
-/**
|
|
|
- * usb_tranzport_probe
|
|
|
- *
|
|
|
- * Called by the usb core when a new device is connected that it thinks
|
|
|
- * this driver might be interested in.
|
|
|
- */
|
|
|
-static int usb_tranzport_probe(struct usb_interface *intf,
|
|
|
- const struct usb_device_id *id) {
|
|
|
- struct usb_device *udev = interface_to_usbdev(intf);
|
|
|
- struct usb_tranzport *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)
|
|
|
- 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 != 8)
|
|
|
- dev_warn(&intf->dev, "Interrupt in endpoint size is not 8!\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 tranzport_cmd)) + 8, GFP_KERNEL);
|
|
|
- if (!dev->ring_buffer)
|
|
|
- goto error;
|
|
|
-
|
|
|
- dev->interrupt_in_buffer =
|
|
|
- kmalloc(dev->interrupt_in_endpoint_size, GFP_KERNEL);
|
|
|
- if (!dev->interrupt_in_buffer)
|
|
|
- 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 != 8)
|
|
|
- dev_warn(&intf->dev,
|
|
|
- "Interrupt out endpoint size is not 8!)\n");
|
|
|
-
|
|
|
- dev->interrupt_out_buffer =
|
|
|
- kmalloc_array(write_buffer_size,
|
|
|
- dev->interrupt_out_endpoint_size, GFP_KERNEL);
|
|
|
- if (!dev->interrupt_out_buffer)
|
|
|
- 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);
|
|
|
-
|
|
|
- retval = usb_register_dev(intf, &usb_tranzport_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;
|
|
|
- }
|
|
|
-
|
|
|
- retval = device_create_file(&intf->dev, &dev_attr_compress_wheel);
|
|
|
- if (retval)
|
|
|
- goto error;
|
|
|
- retval = device_create_file(&intf->dev, &dev_attr_enable);
|
|
|
- if (retval)
|
|
|
- goto error;
|
|
|
- retval = device_create_file(&intf->dev, &dev_attr_offline);
|
|
|
- if (retval)
|
|
|
- goto error;
|
|
|
-
|
|
|
- /* let the user know what node this device is now attached to */
|
|
|
- dev_info(&intf->dev,
|
|
|
- "Tranzport Device #%d now attached to major %d minor %d\n",
|
|
|
- (intf->minor - USB_TRANZPORT_MINOR_BASE), USB_MAJOR,
|
|
|
- intf->minor);
|
|
|
-
|
|
|
-exit:
|
|
|
- return retval;
|
|
|
-
|
|
|
-error:
|
|
|
- usb_tranzport_delete(dev);
|
|
|
- return retval;
|
|
|
-}
|
|
|
-
|
|
|
-/**
|
|
|
- * usb_tranzport_disconnect
|
|
|
- *
|
|
|
- * Called by the usb core when the device is removed from the system.
|
|
|
- */
|
|
|
-static void usb_tranzport_disconnect(struct usb_interface *intf)
|
|
|
-{
|
|
|
- struct usb_tranzport *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_tranzport_class);
|
|
|
-
|
|
|
- /* if the device is not opened, then we clean up right now */
|
|
|
- if (!dev->open_count) {
|
|
|
- mutex_unlock(&dev->mtx);
|
|
|
- usb_tranzport_delete(dev);
|
|
|
- } else {
|
|
|
- dev->intf = NULL;
|
|
|
- mutex_unlock(&dev->mtx);
|
|
|
- }
|
|
|
-
|
|
|
- mutex_unlock(&disconnect_mutex);
|
|
|
-
|
|
|
- dev_info(&intf->dev, "Tranzport Surface #%d now disconnected\n",
|
|
|
- (minor - USB_TRANZPORT_MINOR_BASE));
|
|
|
-}
|
|
|
-
|
|
|
-/* usb specific object needed to register this driver with the usb subsystem */
|
|
|
-static struct usb_driver usb_tranzport_driver = {
|
|
|
- .name = "tranzport",
|
|
|
- .probe = usb_tranzport_probe,
|
|
|
- .disconnect = usb_tranzport_disconnect,
|
|
|
- .id_table = usb_tranzport_table,
|
|
|
-};
|
|
|
-
|
|
|
-module_usb_driver(usb_tranzport_driver);
|
Kristina Martšenko