drivers/media/video/uvc/uvc_status.c

   1 /*
   2  *      uvc_status.c  --  USB Video Class driver - Status endpoint
   3  *
   4  *      Copyright (C) 2007-2008
   5  *          Laurent Pinchart (laurent.pinchart@skynet.be)
   6  *
   7  *      This program is free software; you can redistribute it and/or modify
   8  *      it under the terms of the GNU General Public License as published by
   9  *      the Free Software Foundation; either version 2 of the License, or
  10  *      (at your option) any later version.
  11  *
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/version.h>
  16 #include <linux/input.h>
  17 #include <linux/usb.h>
  18 #include <linux/usb/input.h>
  19
  20 #include "uvcvideo.h"
  21
  22 /* --------------------------------------------------------------------------
  23  * Input device
  24  */
  25 static int uvc_input_init(struct uvc_device *dev)
  26 {
  27         struct usb_device *udev = dev->udev;
  28         struct input_dev *input;
  29         char *phys = NULL;
  30         int ret;
  31
  32         input = input_allocate_device();
  33         if (input == NULL)
  34                 return -ENOMEM;
  35
  36         phys = kmalloc(6 + strlen(udev->bus->bus_name) + strlen(udev->devpath),
  37                         GFP_KERNEL);
  38         if (phys == NULL) {
  39                 ret = -ENOMEM;
  40                 goto error;
  41         }
  42         sprintf(phys, "usb-%s-%s", udev->bus->bus_name, udev->devpath);
  43
  44         input->name = dev->name;
  45         input->phys = phys;
  46         usb_to_input_id(udev, &input->id);
  47         input->dev.parent = &dev->intf->dev;
  48
  49         set_bit(EV_KEY, input->evbit);
  50         set_bit(BTN_0, input->keybit);
  51
  52         if ((ret = input_register_device(input)) < 0)
  53                 goto error;
  54
  55         dev->input = input;
  56         return 0;
  57
  58 error:
  59         input_free_device(input);
  60         kfree(phys);
  61         return ret;
  62 }
  63
  64 static void uvc_input_cleanup(struct uvc_device *dev)
  65 {
  66         if (dev->input)
  67                 input_unregister_device(dev->input);
  68 }
  69
  70 /* --------------------------------------------------------------------------
  71  * Status interrupt endpoint
  72  */
  73 static void uvc_event_streaming(struct uvc_device *dev, __u8 *data, int len)
  74 {
  75         if (len < 3) {
  76                 uvc_trace(UVC_TRACE_STATUS, "Invalid streaming status event "
  77                                 "received.\n");
  78                 return;
  79         }
  80
  81         if (data[2] == 0) {
  82                 if (len < 4)
  83                         return;
  84                 uvc_trace(UVC_TRACE_STATUS, "Button (intf %u) %s len %d\n",
  85                         data[1], data[3] ? "pressed" : "released", len);
  86                 if (dev->input)
  87                         input_report_key(dev->input, BTN_0, data[3]);
  88         } else {
  89                 uvc_trace(UVC_TRACE_STATUS, "Stream %u error event %02x %02x "
  90                         "len %d.\n", data[1], data[2], data[3], len);
  91         }
  92 }
  93
  94 static void uvc_event_control(struct uvc_device *dev, __u8 *data, int len)
  95 {
  96         char *attrs[3] = { "value", "info", "failure" };
  97
  98         if (len < 6 || data[2] != 0 || data[4] > 2) {
  99                 uvc_trace(UVC_TRACE_STATUS, "Invalid control status event "
 100                                 "received.\n");
 101                 return;
 102         }
 103
 104         uvc_trace(UVC_TRACE_STATUS, "Control %u/%u %s change len %d.\n",
 105                 data[1], data[3], attrs[data[4]], len);
 106 }
 107
 108 static void uvc_status_complete(struct urb *urb)
 109 {
 110         struct uvc_device *dev = urb->context;
 111         int len, ret;
 112
 113         switch (urb->status) {
 114         case 0:
 115                 break;
 116
 117         case -ENOENT:           /* usb_kill_urb() called. */
 118         case -ECONNRESET:       /* usb_unlink_urb() called. */
 119         case -ESHUTDOWN:        /* The endpoint is being disabled. */
 120         case -EPROTO:           /* Device is disconnected (reported by some
 121                                  * host controller). */
 122                 return;
 123
 124         default:
 125                 uvc_printk(KERN_WARNING, "Non-zero status (%d) in status "
 126                         "completion handler.\n", urb->status);
 127                 return;
 128         }
 129
 130         len = urb->actual_length;
 131         if (len > 0) {
 132                 switch (dev->status[0] & 0x0f) {
 133                 case UVC_STATUS_TYPE_CONTROL:
 134                         uvc_event_control(dev, dev->status, len);
 135                         break;
 136
 137                 case UVC_STATUS_TYPE_STREAMING:
 138                         uvc_event_streaming(dev, dev->status, len);
 139                         break;
 140
 141                 default:
 142                         uvc_printk(KERN_INFO, "unknown event type %u.\n",
 143                                 dev->status[0]);
 144                         break;
 145                 }
 146         }
 147
 148         /* Resubmit the URB. */
 149         urb->interval = dev->int_ep->desc.bInterval;
 150         if ((ret = usb_submit_urb(urb, GFP_ATOMIC)) < 0) {
 151                 uvc_printk(KERN_ERR, "Failed to resubmit status URB (%d).\n",
 152                         ret);
 153         }
 154 }
 155
 156 int uvc_status_init(struct uvc_device *dev)
 157 {
 158         struct usb_host_endpoint *ep = dev->int_ep;
 159         unsigned int pipe;
 160         int interval;
 161
 162         if (ep == NULL)
 163                 return 0;
 164
 165         uvc_input_init(dev);
 166
 167         dev->int_urb = usb_alloc_urb(0, GFP_KERNEL);
 168         if (dev->int_urb == NULL)
 169                 return -ENOMEM;
 170
 171         pipe = usb_rcvintpipe(dev->udev, ep->desc.bEndpointAddress);
 172
 173         /* For high-speed interrupt endpoints, the bInterval value is used as
 174          * an exponent of two. Some developers forgot about it.
 175          */
 176         interval = ep->desc.bInterval;
 177         if (interval > 16 && dev->udev->speed == USB_SPEED_HIGH &&
 178             (dev->quirks & UVC_QUIRK_STATUS_INTERVAL))
 179                 interval = fls(interval) - 1;
 180
 181         usb_fill_int_urb(dev->int_urb, dev->udev, pipe,
 182                 dev->status, sizeof dev->status, uvc_status_complete,
 183                 dev, interval);
 184
 185         return usb_submit_urb(dev->int_urb, GFP_KERNEL);
 186 }
 187
 188 void uvc_status_cleanup(struct uvc_device *dev)
 189 {
 190         usb_kill_urb(dev->int_urb);
 191         usb_free_urb(dev->int_urb);
 192         uvc_input_cleanup(dev);
 193 }
 194
 195 int uvc_status_suspend(struct uvc_device *dev)
 196 {
 197         usb_kill_urb(dev->int_urb);
 198         return 0;
 199 }
 200
 201 int uvc_status_resume(struct uvc_device *dev)
 202 {
 203         if (dev->int_urb == NULL)
 204                 return 0;
 205
 206         return usb_submit_urb(dev->int_urb, GFP_KERNEL);
 207 }