drivers/media/usb/gspca/benq.c

   1 /*
   2  * Benq DC E300 subdriver
   3  *
   4  * Copyright (C) 2009 Jean-Francois Moine (http://moinejf.free.fr)
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14  * GNU General Public License for more details.
  15  */
  16
  17 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  18
  19 #define MODULE_NAME "benq"
  20
  21 #include "gspca.h"
  22
  23 MODULE_AUTHOR("Jean-Francois Moine <http://moinejf.free.fr>");
  24 MODULE_DESCRIPTION("Benq DC E300 USB Camera Driver");
  25 MODULE_LICENSE("GPL");
  26
  27 /* specific webcam descriptor */
  28 struct sd {
  29         struct gspca_dev gspca_dev;     /* !! must be the first item */
  30 };
  31
  32 static const struct v4l2_pix_format vga_mode[] = {
  33         {320, 240, V4L2_PIX_FMT_JPEG, V4L2_FIELD_NONE,
  34                 .bytesperline = 320,
  35                 .sizeimage = 320 * 240 * 3 / 8 + 590,
  36                 .colorspace = V4L2_COLORSPACE_JPEG},
  37 };
  38
  39 static void sd_isoc_irq(struct urb *urb);
  40
  41 /* -- write a register -- */
  42 static void reg_w(struct gspca_dev *gspca_dev,
  43                         u16 value, u16 index)
  44 {
  45         struct usb_device *dev = gspca_dev->dev;
  46         int ret;
  47
  48         if (gspca_dev->usb_err < 0)
  49                 return;
  50         ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
  51                         0x02,
  52                         USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  53                         value,
  54                         index,
  55                         NULL,
  56                         0,
  57                         500);
  58         if (ret < 0) {
  59                 pr_err("reg_w err %d\n", ret);
  60                 gspca_dev->usb_err = ret;
  61         }
  62 }
  63
  64 /* this function is called at probe time */
  65 static int sd_config(struct gspca_dev *gspca_dev,
  66                         const struct usb_device_id *id)
  67 {
  68         gspca_dev->cam.cam_mode = vga_mode;
  69         gspca_dev->cam.nmodes = ARRAY_SIZE(vga_mode);
  70         gspca_dev->cam.no_urb_create = 1;
  71         return 0;
  72 }
  73
  74 /* this function is called at probe and resume time */
  75 static int sd_init(struct gspca_dev *gspca_dev)
  76 {
  77         return 0;
  78 }
  79
  80 /* -- start the camera -- */
  81 static int sd_start(struct gspca_dev *gspca_dev)
  82 {
  83         struct urb *urb;
  84         int i, n;
  85
  86         /* create 4 URBs - 2 on endpoint 0x83 and 2 on 0x082 */
  87 #if MAX_NURBS < 4
  88 #error "Not enough URBs in the gspca table"
  89 #endif
  90 #define SD_PKT_SZ 64
  91 #define SD_NPKT 32
  92         for (n = 0; n < 4; n++) {
  93                 urb = usb_alloc_urb(SD_NPKT, GFP_KERNEL);
  94                 if (!urb)
  95                         return -ENOMEM;
  96                 gspca_dev->urb[n] = urb;
  97                 urb->transfer_buffer = usb_alloc_coherent(gspca_dev->dev,
  98                                                 SD_PKT_SZ * SD_NPKT,
  99                                                 GFP_KERNEL,
 100                                                 &urb->transfer_dma);
 101
 102                 if (urb->transfer_buffer == NULL) {
 103                         pr_err("usb_alloc_coherent failed\n");
 104                         return -ENOMEM;
 105                 }
 106                 urb->dev = gspca_dev->dev;
 107                 urb->context = gspca_dev;
 108                 urb->transfer_buffer_length = SD_PKT_SZ * SD_NPKT;
 109                 urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
 110                                         n & 1 ? 0x82 : 0x83);
 111                 urb->transfer_flags = URB_ISO_ASAP
 112                                         | URB_NO_TRANSFER_DMA_MAP;
 113                 urb->interval = 1;
 114                 urb->complete = sd_isoc_irq;
 115                 urb->number_of_packets = SD_NPKT;
 116                 for (i = 0; i < SD_NPKT; i++) {
 117                         urb->iso_frame_desc[i].length = SD_PKT_SZ;
 118                         urb->iso_frame_desc[i].offset = SD_PKT_SZ * i;
 119                 }
 120         }
 121
 122         return gspca_dev->usb_err;
 123 }
 124
 125 static void sd_stopN(struct gspca_dev *gspca_dev)
 126 {
 127         struct usb_interface *intf;
 128
 129         reg_w(gspca_dev, 0x003c, 0x0003);
 130         reg_w(gspca_dev, 0x003c, 0x0004);
 131         reg_w(gspca_dev, 0x003c, 0x0005);
 132         reg_w(gspca_dev, 0x003c, 0x0006);
 133         reg_w(gspca_dev, 0x003c, 0x0007);
 134
 135         intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
 136         usb_set_interface(gspca_dev->dev, gspca_dev->iface,
 137                                         intf->num_altsetting - 1);
 138 }
 139
 140 static void sd_pkt_scan(struct gspca_dev *gspca_dev,
 141                         u8 *data,               /* isoc packet */
 142                         int len)                /* iso packet length */
 143 {
 144         /* unused */
 145 }
 146
 147 /* reception of an URB */
 148 static void sd_isoc_irq(struct urb *urb)
 149 {
 150         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 151         struct urb *urb0;
 152         u8 *data;
 153         int i, st;
 154
 155         gspca_dbg(gspca_dev, D_PACK, "sd isoc irq\n");
 156         if (!gspca_dev->streaming)
 157                 return;
 158         if (urb->status != 0) {
 159                 if (urb->status == -ESHUTDOWN)
 160                         return;         /* disconnection */
 161 #ifdef CONFIG_PM
 162                 if (gspca_dev->frozen)
 163                         return;
 164 #endif
 165                 pr_err("urb status: %d\n", urb->status);
 166                 return;
 167         }
 168
 169         /* if this is a control URN (ep 0x83), wait */
 170         if (urb == gspca_dev->urb[0] || urb == gspca_dev->urb[2])
 171                 return;
 172
 173         /* scan both received URBs */
 174         if (urb == gspca_dev->urb[1])
 175                 urb0 = gspca_dev->urb[0];
 176         else
 177                 urb0 = gspca_dev->urb[2];
 178         for (i = 0; i < urb->number_of_packets; i++) {
 179
 180                 /* check the packet status and length */
 181                 if (urb0->iso_frame_desc[i].actual_length != SD_PKT_SZ
 182                     || urb->iso_frame_desc[i].actual_length != SD_PKT_SZ) {
 183                         gspca_err(gspca_dev, "ISOC bad lengths %d / %d\n",
 184                                   urb0->iso_frame_desc[i].actual_length,
 185                                   urb->iso_frame_desc[i].actual_length);
 186                         gspca_dev->last_packet_type = DISCARD_PACKET;
 187                         continue;
 188                 }
 189                 st = urb0->iso_frame_desc[i].status;
 190                 if (st == 0)
 191                         st = urb->iso_frame_desc[i].status;
 192                 if (st) {
 193                         pr_err("ISOC data error: [%d] status=%d\n",
 194                                 i, st);
 195                         gspca_dev->last_packet_type = DISCARD_PACKET;
 196                         continue;
 197                 }
 198
 199                 /*
 200                  * The images are received in URBs of different endpoints
 201                  * (0x83 and 0x82).
 202                  * Image pieces in URBs of ep 0x83 are continuated in URBs of
 203                  * ep 0x82 of the same index.
 204                  * The packets in the URBs of endpoint 0x83 start with:
 205                  *      - 80 ba/bb 00 00 = start of image followed by 'ff d8'
 206                  *      - 04 ba/bb oo oo = image piece
 207                  *              where 'oo oo' is the image offset
 208                                                 (not cheked)
 209                  *      - (other -> bad frame)
 210                  * The images are JPEG encoded with full header and
 211                  * normal ff escape.
 212                  * The end of image ('ff d9') may occur in any URB.
 213                  * (not cheked)
 214                  */
 215                 data = (u8 *) urb0->transfer_buffer
 216                                         + urb0->iso_frame_desc[i].offset;
 217                 if (data[0] == 0x80 && (data[1] & 0xfe) == 0xba) {
 218
 219                         /* new image */
 220                         gspca_frame_add(gspca_dev, LAST_PACKET,
 221                                         NULL, 0);
 222                         gspca_frame_add(gspca_dev, FIRST_PACKET,
 223                                         data + 4, SD_PKT_SZ - 4);
 224                 } else if (data[0] == 0x04 && (data[1] & 0xfe) == 0xba) {
 225                         gspca_frame_add(gspca_dev, INTER_PACKET,
 226                                         data + 4, SD_PKT_SZ - 4);
 227                 } else {
 228                         gspca_dev->last_packet_type = DISCARD_PACKET;
 229                         continue;
 230                 }
 231                 data = (u8 *) urb->transfer_buffer
 232                                         + urb->iso_frame_desc[i].offset;
 233                 gspca_frame_add(gspca_dev, INTER_PACKET,
 234                                 data, SD_PKT_SZ);
 235         }
 236
 237         /* resubmit the URBs */
 238         st = usb_submit_urb(urb0, GFP_ATOMIC);
 239         if (st < 0)
 240                 pr_err("usb_submit_urb(0) ret %d\n", st);
 241         st = usb_submit_urb(urb, GFP_ATOMIC);
 242         if (st < 0)
 243                 pr_err("usb_submit_urb() ret %d\n", st);
 244 }
 245
 246 /* sub-driver description */
 247 static const struct sd_desc sd_desc = {
 248         .name = MODULE_NAME,
 249         .config = sd_config,
 250         .init = sd_init,
 251         .start = sd_start,
 252         .stopN = sd_stopN,
 253         .pkt_scan = sd_pkt_scan,
 254 };
 255
 256 /* -- module initialisation -- */
 257 static const struct usb_device_id device_table[] = {
 258         {USB_DEVICE(0x04a5, 0x3035)},
 259         {}
 260 };
 261 MODULE_DEVICE_TABLE(usb, device_table);
 262
 263 /* -- device connect -- */
 264 static int sd_probe(struct usb_interface *intf,
 265                         const struct usb_device_id *id)
 266 {
 267         return gspca_dev_probe(intf, id, &sd_desc, sizeof(struct sd),
 268                                 THIS_MODULE);
 269 }
 270
 271 static struct usb_driver sd_driver = {
 272         .name = MODULE_NAME,
 273         .id_table = device_table,
 274         .probe = sd_probe,
 275         .disconnect = gspca_disconnect,
 276 #ifdef CONFIG_PM
 277         .suspend = gspca_suspend,
 278         .resume = gspca_resume,
 279         .reset_resume = gspca_resume,
 280 #endif
 281 };
 282
 283 module_usb_driver(sd_driver);