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, 97 "Stream %u error event %02x len %d.\n", 98 data[1], data[2], len); 99 } 100 } 101 102 static void uvc_event_control(struct uvc_device *dev, u8 *data, int len) 103 { 104 char *attrs[3] = { "value", "info", "failure" }; 105 106 if (len < 6 || data[2] != 0 || data[4] > 2) { 107 uvc_trace(UVC_TRACE_STATUS, "Invalid control status event " 108 "received.\n"); 109 return; 110 } 111 112 uvc_trace(UVC_TRACE_STATUS, "Control %u/%u %s change len %d.\n", 113 data[1], data[3], attrs[data[4]], len); 114 } 115 116 static void uvc_status_complete(struct urb *urb) 117 { 118 struct uvc_device *dev = urb->context; 119 int len, ret; 120 121 switch (urb->status) { 122 case 0: 123 break; 124 125 case -ENOENT: /* usb_kill_urb() called. */ 126 case -ECONNRESET: /* usb_unlink_urb() called. */ 127 case -ESHUTDOWN: /* The endpoint is being disabled. */ 128 case -EPROTO: /* Device is disconnected (reported by some 129 * host controller). */ 130 return; 131 132 default: 133 uvc_printk(KERN_WARNING, "Non-zero status (%d) in status " 134 "completion handler.\n", urb->status); 135 return; 136 } 137 138 len = urb->actual_length; 139 if (len > 0) { 140 switch (dev->status[0] & 0x0f) { 141 case UVC_STATUS_TYPE_CONTROL: 142 uvc_event_control(dev, dev->status, len); 143 break; 144 145 case UVC_STATUS_TYPE_STREAMING: 146 uvc_event_streaming(dev, dev->status, len); 147 break; 148 149 default: 150 uvc_trace(UVC_TRACE_STATUS, "Unknown status event " 151 "type %u.\n", dev->status[0]); 152 break; 153 } 154 } 155 156 /* Resubmit the URB. */ 157 urb->interval = dev->int_ep->desc.bInterval; 158 if ((ret = usb_submit_urb(urb, GFP_ATOMIC)) < 0) { 159 uvc_printk(KERN_ERR, "Failed to resubmit status URB (%d).\n", 160 ret); 161 } 162 } 163 164 int uvc_status_init(struct uvc_device *dev) 165 { 166 struct usb_host_endpoint *ep = dev->int_ep; 167 unsigned int pipe; 168 int interval; 169 170 if (ep == NULL) 171 return 0; 172 173 uvc_input_init(dev); 174 175 dev->status = kzalloc(UVC_MAX_STATUS_SIZE, GFP_KERNEL); 176 if (dev->status == NULL) 177 return -ENOMEM; 178 179 dev->int_urb = usb_alloc_urb(0, GFP_KERNEL); 180 if (dev->int_urb == NULL) { 181 kfree(dev->status); 182 return -ENOMEM; 183 } 184 185 pipe = usb_rcvintpipe(dev->udev, ep->desc.bEndpointAddress); 186 187 /* For high-speed interrupt endpoints, the bInterval value is used as 188 * an exponent of two. Some developers forgot about it. 189 */ 190 interval = ep->desc.bInterval; 191 if (interval > 16 && dev->udev->speed == USB_SPEED_HIGH && 192 (dev->quirks & UVC_QUIRK_STATUS_INTERVAL)) 193 interval = fls(interval) - 1; 194 195 usb_fill_int_urb(dev->int_urb, dev->udev, pipe, 196 dev->status, UVC_MAX_STATUS_SIZE, uvc_status_complete, 197 dev, interval); 198 199 return 0; 200 } 201 202 void uvc_status_cleanup(struct uvc_device *dev) 203 { 204 usb_kill_urb(dev->int_urb); 205 usb_free_urb(dev->int_urb); 206 kfree(dev->status); 207 uvc_input_cleanup(dev); 208 } 209 210 int uvc_status_start(struct uvc_device *dev, gfp_t flags) 211 { 212 if (dev->int_urb == NULL) 213 return 0; 214 215 return usb_submit_urb(dev->int_urb, flags); 216 } 217 218 void uvc_status_stop(struct uvc_device *dev) 219 { 220 usb_kill_urb(dev->int_urb); 221 } 222