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 } 221