drivers/media/usb/uvc/uvc_status.c

   1 /*
   2  *      uvc_status.c  --  USB Video Class driver - Status endpoint
   3  *
   4  *      Copyright (C) 2005-2009
   5  *          Laurent Pinchart (laurent.pinchart@ideasonboard.com)
   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/input.h>
  16 #include <linux/slab.h>
  17 #include <linux/usb.h>
  18 #include <linux/usb/input.h>
  19
  20 #include "uvcvideo.h"
  21
  22 /* --------------------------------------------------------------------------
  23  * Input device
  24  */
  25 #ifdef CONFIG_USB_VIDEO_CLASS_INPUT_EVDEV
  26 static int uvc_input_init(struct uvc_device *dev)
  27 {
  28         struct input_dev *input;
  29         int ret;
  30
  31         input = input_allocate_device();
  32         if (input == NULL)
  33                 return -ENOMEM;
  34
  35         usb_make_path(dev->udev, dev->input_phys, sizeof(dev->input_phys));
  36         strlcat(dev->input_phys, "/button", sizeof(dev->input_phys));
  37
  38         input->name = dev->name;
  39         input->phys = dev->input_phys;
  40         usb_to_input_id(dev->udev, &input->id);
  41         input->dev.parent = &dev->intf->dev;
  42
  43         __set_bit(EV_KEY, input->evbit);
  44         __set_bit(KEY_CAMERA, input->keybit);
  45
  46         if ((ret = input_register_device(input)) < 0)
  47                 goto error;
  48
  49         dev->input = input;
  50         return 0;
  51
  52 error:
  53         input_free_device(input);
  54         return ret;
  55 }
  56
  57 static void uvc_input_cleanup(struct uvc_device *dev)
  58 {
  59         if (dev->input)
  60                 input_unregister_device(dev->input);
  61 }
  62
  63 static void uvc_input_report_key(struct uvc_device *dev, unsigned int code,
  64         int value)
  65 {
  66         if (dev->input) {
  67                 input_report_key(dev->input, code, value);
  68                 input_sync(dev->input);
  69         }
  70 }
  71
  72 #else
  73 #define uvc_input_init(dev)
  74 #define uvc_input_cleanup(dev)
  75 #define uvc_input_report_key(dev, code, value)
  76 #endif /* CONFIG_USB_VIDEO_CLASS_INPUT_EVDEV */
  77
  78 /* --------------------------------------------------------------------------
  79  * Status interrupt endpoint
  80  */
  81 static void uvc_event_streaming(struct uvc_device *dev, __u8 *data, int len)
  82 {
  83         if (len < 3) {
  84                 uvc_trace(UVC_TRACE_STATUS, "Invalid streaming status event "
  85                                 "received.\n");
  86                 return;
  87         }
  88
  89         if (data[2] == 0) {
  90                 if (len < 4)
  91                         return;
  92                 uvc_trace(UVC_TRACE_STATUS, "Button (intf %u) %s len %d\n",
  93                         data[1], data[3] ? "pressed" : "released", len);
  94                 uvc_input_report_key(dev, KEY_CAMERA, data[3]);
  95         } else {
  96                 uvc_trace(UVC_TRACE_STATUS, "Stream %u error event %02x %02x "
  97                         "len %d.\n", data[1], data[2], data[3], len);
  98         }
  99 }
 100
 101 static void uvc_event_control(struct uvc_device *dev, __u8 *data, int len)
 102 {
 103         char *attrs[3] = { "value", "info", "failure" };
 104
 105         if (len < 6 || data[2] != 0 || data[4] > 2) {
 106                 uvc_trace(UVC_TRACE_STATUS, "Invalid control status event "
 107                                 "received.\n");
 108                 return;
 109         }
 110
 111         uvc_trace(UVC_TRACE_STATUS, "Control %u/%u %s change len %d.\n",
 112                 data[1], data[3], attrs[data[4]], len);
 113 }
 114
 115 static void uvc_status_complete(struct urb *urb)
 116 {
 117         struct uvc_device *dev = urb->context;
 118         int len, ret;
 119
 120         switch (urb->status) {
 121         case 0:
 122                 break;
 123
 124         case -ENOENT:           /* usb_kill_urb() called. */
 125         case -ECONNRESET:       /* usb_unlink_urb() called. */
 126         case -ESHUTDOWN:        /* The endpoint is being disabled. */
 127         case -EPROTO:           /* Device is disconnected (reported by some
 128                                  * host controller). */
 129                 return;
 130
 131         default:
 132                 uvc_printk(KERN_WARNING, "Non-zero status (%d) in status "
 133                         "completion handler.\n", urb->status);
 134                 return;
 135         }
 136
 137         len = urb->actual_length;
 138         if (len > 0) {
 139                 switch (dev->status[0] & 0x0f) {
 140                 case UVC_STATUS_TYPE_CONTROL:
 141                         uvc_event_control(dev, dev->status, len);
 142                         break;
 143
 144                 case UVC_STATUS_TYPE_STREAMING:
 145                         uvc_event_streaming(dev, dev->status, len);
 146                         break;
 147
 148                 default:
 149                         uvc_trace(UVC_TRACE_STATUS, "Unknown status event "
 150                                 "type %u.\n", dev->status[0]);
 151                         break;
 152                 }
 153         }
 154
 155         /* Resubmit the URB. */
 156         urb->interval = dev->int_ep->desc.bInterval;
 157         if ((ret = usb_submit_urb(urb, GFP_ATOMIC)) < 0) {
 158                 uvc_printk(KERN_ERR, "Failed to resubmit status URB (%d).\n",
 159                         ret);
 160         }
 161 }
 162
 163 int uvc_status_init(struct uvc_device *dev)
 164 {
 165         struct usb_host_endpoint *ep = dev->int_ep;
 166         unsigned int pipe;
 167         int interval;
 168
 169         if (ep == NULL)
 170                 return 0;
 171
 172         uvc_input_init(dev);
 173
 174         dev->status = kzalloc(UVC_MAX_STATUS_SIZE, GFP_KERNEL);
 175         if (dev->status == NULL)
 176                 return -ENOMEM;
 177
 178         dev->int_urb = usb_alloc_urb(0, GFP_KERNEL);
 179         if (dev->int_urb == NULL) {
 180                 kfree(dev->status);
 181                 return -ENOMEM;
 182         }
 183
 184         pipe = usb_rcvintpipe(dev->udev, ep->desc.bEndpointAddress);
 185
 186         /* For high-speed interrupt endpoints, the bInterval value is used as
 187          * an exponent of two. Some developers forgot about it.
 188          */
 189         interval = ep->desc.bInterval;
 190         if (interval > 16 && dev->udev->speed == USB_SPEED_HIGH &&
 191             (dev->quirks & UVC_QUIRK_STATUS_INTERVAL))
 192                 interval = fls(interval) - 1;
 193
 194         usb_fill_int_urb(dev->int_urb, dev->udev, pipe,
 195                 dev->status, UVC_MAX_STATUS_SIZE, uvc_status_complete,
 196                 dev, interval);
 197
 198         return 0;
 199 }
 200
 201 void uvc_status_cleanup(struct uvc_device *dev)
 202 {
 203         usb_kill_urb(dev->int_urb);
 204         usb_free_urb(dev->int_urb);
 205         kfree(dev->status);
 206         uvc_input_cleanup(dev);
 207 }
 208
 209 int uvc_status_start(struct uvc_device *dev, gfp_t flags)
 210 {
 211         if (dev->int_urb == NULL)
 212                 return 0;
 213
 214         return usb_submit_urb(dev->int_urb, flags);
 215 }
 216
 217 void uvc_status_stop(struct uvc_device *dev)
 218 {
 219         usb_kill_urb(dev->int_urb);
 220 }