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 #ifdef CONFIG_USB_VIDEO_CLASS_INPUT_EVDEV
  26 static int uvc_input_init(struct uvc_device *dev)
  27 {
  28         struct usb_device *udev = dev->udev;
  29         struct input_dev *input;
  30         char *phys = NULL;
  31         int ret;
  32
  33         input = input_allocate_device();
  34         if (input == NULL)
  35                 return -ENOMEM;
  36
  37         phys = kmalloc(6 + strlen(udev->bus->bus_name) + strlen(udev->devpath),
  38                         GFP_KERNEL);
  39         if (phys == NULL) {
  40                 ret = -ENOMEM;
  41                 goto error;
  42         }
  43         sprintf(phys, "usb-%s-%s", udev->bus->bus_name, udev->devpath);
  44
  45         input->name = dev->name;
  46         input->phys = phys;
  47         usb_to_input_id(udev, &input->id);
  48         input->dev.parent = &dev->intf->dev;
  49
  50         set_bit(EV_KEY, input->evbit);
  51         set_bit(BTN_0, input->keybit);
  52
  53         if ((ret = input_register_device(input)) < 0)
  54                 goto error;
  55
  56         dev->input = input;
  57         return 0;
  58
  59 error:
  60         input_free_device(input);
  61         kfree(phys);
  62         return ret;
  63 }
  64
  65 static void uvc_input_cleanup(struct uvc_device *dev)
  66 {
  67         if (dev->input)
  68                 input_unregister_device(dev->input);
  69 }
  70
  71 static void uvc_input_report_key(struct uvc_device *dev, unsigned int code,
  72         int value)
  73 {
  74         if (dev->input)
  75                 input_report_key(dev->input, code, value);
  76 }
  77
  78 #else
  79 #define uvc_input_init(dev)
  80 #define uvc_input_cleanup(dev)
  81 #define uvc_input_report_key(dev, code, value)
  82 #endif /* CONFIG_USB_VIDEO_CLASS_INPUT_EVDEV */
  83
  84 /* --------------------------------------------------------------------------
  85  * Status interrupt endpoint
  86  */
  87 static void uvc_event_streaming(struct uvc_device *dev, __u8 *data, int len)
  88 {
  89         if (len < 3) {
  90                 uvc_trace(UVC_TRACE_STATUS, "Invalid streaming status event "
  91                                 "received.\n");
  92                 return;
  93         }
  94
  95         if (data[2] == 0) {
  96                 if (len < 4)
  97                         return;
  98                 uvc_trace(UVC_TRACE_STATUS, "Button (intf %u) %s len %d\n",
  99                         data[1], data[3] ? "pressed" : "released", len);
 100                 uvc_input_report_key(dev, BTN_0, data[3]);
 101         } else {
 102                 uvc_trace(UVC_TRACE_STATUS, "Stream %u error event %02x %02x "
 103                         "len %d.\n", data[1], data[2], data[3], len);
 104         }
 105 }
 106
 107 static void uvc_event_control(struct uvc_device *dev, __u8 *data, int len)
 108 {
 109         char *attrs[3] = { "value", "info", "failure" };
 110
 111         if (len < 6 || data[2] != 0 || data[4] > 2) {
 112                 uvc_trace(UVC_TRACE_STATUS, "Invalid control status event "
 113                                 "received.\n");
 114                 return;
 115         }
 116
 117         uvc_trace(UVC_TRACE_STATUS, "Control %u/%u %s change len %d.\n",
 118                 data[1], data[3], attrs[data[4]], len);
 119 }
 120
 121 static void uvc_status_complete(struct urb *urb)
 122 {
 123         struct uvc_device *dev = urb->context;
 124         int len, ret;
 125
 126         switch (urb->status) {
 127         case 0:
 128                 break;
 129
 130         case -ENOENT:           /* usb_kill_urb() called. */
 131         case -ECONNRESET:       /* usb_unlink_urb() called. */
 132         case -ESHUTDOWN:        /* The endpoint is being disabled. */
 133         case -EPROTO:           /* Device is disconnected (reported by some
 134                                  * host controller). */
 135                 return;
 136
 137         default:
 138                 uvc_printk(KERN_WARNING, "Non-zero status (%d) in status "
 139                         "completion handler.\n", urb->status);
 140                 return;
 141         }
 142
 143         len = urb->actual_length;
 144         if (len > 0) {
 145                 switch (dev->status[0] & 0x0f) {
 146                 case UVC_STATUS_TYPE_CONTROL:
 147                         uvc_event_control(dev, dev->status, len);
 148                         break;
 149
 150                 case UVC_STATUS_TYPE_STREAMING:
 151                         uvc_event_streaming(dev, dev->status, len);
 152                         break;
 153
 154                 default:
 155                         uvc_printk(KERN_INFO, "unknown event type %u.\n",
 156                                 dev->status[0]);
 157                         break;
 158                 }
 159         }
 160
 161         /* Resubmit the URB. */
 162         urb->interval = dev->int_ep->desc.bInterval;
 163         if ((ret = usb_submit_urb(urb, GFP_ATOMIC)) < 0) {
 164                 uvc_printk(KERN_ERR, "Failed to resubmit status URB (%d).\n",
 165                         ret);
 166         }
 167 }
 168
 169 int uvc_status_init(struct uvc_device *dev)
 170 {
 171         struct usb_host_endpoint *ep = dev->int_ep;
 172         unsigned int pipe;
 173         int interval;
 174
 175         if (ep == NULL)
 176                 return 0;
 177
 178         uvc_input_init(dev);
 179
 180         dev->int_urb = usb_alloc_urb(0, GFP_KERNEL);
 181         if (dev->int_urb == NULL)
 182                 return -ENOMEM;
 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, sizeof dev->status, uvc_status_complete,
 196                 dev, interval);
 197
 198         return usb_submit_urb(dev->int_urb, GFP_KERNEL);
 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         uvc_input_cleanup(dev);
 206 }
 207
 208 int uvc_status_suspend(struct uvc_device *dev)
 209 {
 210         usb_kill_urb(dev->int_urb);
 211         return 0;
 212 }
 213
 214 int uvc_status_resume(struct uvc_device *dev)
 215 {
 216         if (dev->int_urb == NULL)
 217                 return 0;
 218
 219         return usb_submit_urb(dev->int_urb, GFP_NOIO);
 220 }
 221