drivers/media/video/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  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  19  */
  20
  21 #define MODULE_NAME "benq"
  22
  23 #include "gspca.h"
  24
  25 MODULE_AUTHOR("Jean-Francois Moine <http://moinejf.free.fr>");
  26 MODULE_DESCRIPTION("Benq DC E300 USB Camera Driver");
  27 MODULE_LICENSE("GPL");
  28
  29 /* specific webcam descriptor */
  30 struct sd {
  31         struct gspca_dev gspca_dev;     /* !! must be the first item */
  32 };
  33
  34 /* V4L2 controls supported by the driver */
  35 static const struct ctrl sd_ctrls[] = {
  36 };
  37
  38 static const struct v4l2_pix_format vga_mode[] = {
  39         {320, 240, V4L2_PIX_FMT_JPEG, V4L2_FIELD_NONE,
  40                 .bytesperline = 320,
  41                 .sizeimage = 320 * 240 * 3 / 8 + 590,
  42                 .colorspace = V4L2_COLORSPACE_JPEG},
  43 };
  44
  45 static void sd_isoc_irq(struct urb *urb);
  46
  47 /* -- write a register -- */
  48 static void reg_w(struct gspca_dev *gspca_dev,
  49                         u16 value, u16 index)
  50 {
  51         struct usb_device *dev = gspca_dev->dev;
  52         int ret;
  53
  54         if (gspca_dev->usb_err < 0)
  55                 return;
  56         ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
  57                         0x02,
  58                         USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  59                         value,
  60                         index,
  61                         NULL,
  62                         0,
  63                         500);
  64         if (ret < 0) {
  65                 err("reg_w err %d", ret);
  66                 gspca_dev->usb_err = ret;
  67         }
  68 }
  69
  70 /* this function is called at probe time */
  71 static int sd_config(struct gspca_dev *gspca_dev,
  72                         const struct usb_device_id *id)
  73 {
  74         gspca_dev->cam.cam_mode = vga_mode;
  75         gspca_dev->cam.nmodes = ARRAY_SIZE(vga_mode);
  76         gspca_dev->cam.no_urb_create = 1;
  77         gspca_dev->cam.reverse_alts = 1;
  78         return 0;
  79 }
  80
  81 /* this function is called at probe and resume time */
  82 static int sd_init(struct gspca_dev *gspca_dev)
  83 {
  84         return 0;
  85 }
  86
  87 static int sd_isoc_init(struct gspca_dev *gspca_dev)
  88 {
  89         int ret;
  90
  91         ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface,
  92                 gspca_dev->nbalt - 1);
  93         if (ret < 0) {
  94                 err("usb_set_interface failed");
  95                 return ret;
  96         }
  97 /*      reg_w(gspca_dev, 0x0003, 0x0002); */
  98         return 0;
  99 }
 100
 101 /* -- start the camera -- */
 102 static int sd_start(struct gspca_dev *gspca_dev)
 103 {
 104         struct urb *urb;
 105         int i, n;
 106
 107         /* create 4 URBs - 2 on endpoint 0x83 and 2 on 0x082 */
 108 #if MAX_NURBS < 4
 109 #error "Not enough URBs in the gspca table"
 110 #endif
 111 #define SD_PKT_SZ 64
 112 #define SD_NPKT 32
 113         for (n = 0; n < 4; n++) {
 114                 urb = usb_alloc_urb(SD_NPKT, GFP_KERNEL);
 115                 if (!urb) {
 116                         err("usb_alloc_urb failed");
 117                         return -ENOMEM;
 118                 }
 119                 gspca_dev->urb[n] = urb;
 120                 urb->transfer_buffer = usb_alloc_coherent(gspca_dev->dev,
 121                                                 SD_PKT_SZ * SD_NPKT,
 122                                                 GFP_KERNEL,
 123                                                 &urb->transfer_dma);
 124
 125                 if (urb->transfer_buffer == NULL) {
 126                         err("usb_alloc_coherent failed");
 127                         return -ENOMEM;
 128                 }
 129                 urb->dev = gspca_dev->dev;
 130                 urb->context = gspca_dev;
 131                 urb->transfer_buffer_length = SD_PKT_SZ * SD_NPKT;
 132                 urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
 133                                         n & 1 ? 0x82 : 0x83);
 134                 urb->transfer_flags = URB_ISO_ASAP
 135                                         | URB_NO_TRANSFER_DMA_MAP;
 136                 urb->interval = 1;
 137                 urb->complete = sd_isoc_irq;
 138                 urb->number_of_packets = SD_NPKT;
 139                 for (i = 0; i < SD_NPKT; i++) {
 140                         urb->iso_frame_desc[i].length = SD_PKT_SZ;
 141                         urb->iso_frame_desc[i].offset = SD_PKT_SZ * i;
 142                 }
 143         }
 144
 145         return gspca_dev->usb_err;
 146 }
 147
 148 static void sd_stopN(struct gspca_dev *gspca_dev)
 149 {
 150         reg_w(gspca_dev, 0x003c, 0x0003);
 151         reg_w(gspca_dev, 0x003c, 0x0004);
 152         reg_w(gspca_dev, 0x003c, 0x0005);
 153         reg_w(gspca_dev, 0x003c, 0x0006);
 154         reg_w(gspca_dev, 0x003c, 0x0007);
 155         usb_set_interface(gspca_dev->dev, gspca_dev->iface,
 156                                         gspca_dev->nbalt - 1);
 157 }
 158
 159 static void sd_pkt_scan(struct gspca_dev *gspca_dev,
 160                         u8 *data,               /* isoc packet */
 161                         int len)                /* iso packet length */
 162 {
 163         /* unused */
 164 }
 165
 166 /* reception of an URB */
 167 static void sd_isoc_irq(struct urb *urb)
 168 {
 169         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 170         struct urb *urb0;
 171         u8 *data;
 172         int i, st;
 173
 174         PDEBUG(D_PACK, "sd isoc irq");
 175         if (!gspca_dev->streaming)
 176                 return;
 177         if (urb->status != 0) {
 178                 if (urb->status == -ESHUTDOWN)
 179                         return;         /* disconnection */
 180 #ifdef CONFIG_PM
 181                 if (gspca_dev->frozen)
 182                         return;
 183 #endif
 184                 err("urb status: %d", urb->status);
 185                 return;
 186         }
 187
 188         /* if this is a control URN (ep 0x83), wait */
 189         if (urb == gspca_dev->urb[0] || urb == gspca_dev->urb[2])
 190                 return;
 191
 192         /* scan both received URBs */
 193         if (urb == gspca_dev->urb[1])
 194                 urb0 = gspca_dev->urb[0];
 195         else
 196                 urb0 = gspca_dev->urb[2];
 197         for (i = 0; i < urb->number_of_packets; i++) {
 198
 199                 /* check the packet status and length */
 200                 if (urb0->iso_frame_desc[i].actual_length != SD_PKT_SZ
 201                     || urb->iso_frame_desc[i].actual_length != SD_PKT_SZ) {
 202                         PDEBUG(D_ERR, "ISOC bad lengths %d / %d",
 203                                 urb0->iso_frame_desc[i].actual_length,
 204                                 urb->iso_frame_desc[i].actual_length);
 205                         gspca_dev->last_packet_type = DISCARD_PACKET;
 206                         continue;
 207                 }
 208                 st = urb0->iso_frame_desc[i].status;
 209                 if (st == 0)
 210                         st = urb->iso_frame_desc[i].status;
 211                 if (st) {
 212                         err("ISOC data error: [%d] status=%d",
 213                                 i, st);
 214                         gspca_dev->last_packet_type = DISCARD_PACKET;
 215                         continue;
 216                 }
 217
 218                 /*
 219                  * The images are received in URBs of different endpoints
 220                  * (0x83 and 0x82).
 221                  * Image pieces in URBs of ep 0x83 are continuated in URBs of
 222                  * ep 0x82 of the same index.
 223                  * The packets in the URBs of endpoint 0x83 start with:
 224                  *      - 80 ba/bb 00 00 = start of image followed by 'ff d8'
 225                  *      - 04 ba/bb oo oo = image piece
 226                  *              where 'oo oo' is the image offset
 227                                                 (not cheked)
 228                  *      - (other -> bad frame)
 229                  * The images are JPEG encoded with full header and
 230                  * normal ff escape.
 231                  * The end of image ('ff d9') may occur in any URB.
 232                  * (not cheked)
 233                  */
 234                 data = (u8 *) urb0->transfer_buffer
 235                                         + urb0->iso_frame_desc[i].offset;
 236                 if (data[0] == 0x80 && (data[1] & 0xfe) == 0xba) {
 237
 238                         /* new image */
 239                         gspca_frame_add(gspca_dev, LAST_PACKET,
 240                                         NULL, 0);
 241                         gspca_frame_add(gspca_dev, FIRST_PACKET,
 242                                         data + 4, SD_PKT_SZ - 4);
 243                 } else if (data[0] == 0x04 && (data[1] & 0xfe) == 0xba) {
 244                         gspca_frame_add(gspca_dev, INTER_PACKET,
 245                                         data + 4, SD_PKT_SZ - 4);
 246                 } else {
 247                         gspca_dev->last_packet_type = DISCARD_PACKET;
 248                         continue;
 249                 }
 250                 data = (u8 *) urb->transfer_buffer
 251                                         + urb->iso_frame_desc[i].offset;
 252                         gspca_frame_add(gspca_dev, INTER_PACKET,
 253                                         data, SD_PKT_SZ);
 254         }
 255
 256         /* resubmit the URBs */
 257         st = usb_submit_urb(urb0, GFP_ATOMIC);
 258         if (st < 0)
 259                 err("usb_submit_urb(0) ret %d", st);
 260         st = usb_submit_urb(urb, GFP_ATOMIC);
 261         if (st < 0)
 262                 err("usb_submit_urb() ret %d", st);
 263 }
 264
 265 /* sub-driver description */
 266 static const struct sd_desc sd_desc = {
 267         .name = MODULE_NAME,
 268         .ctrls = sd_ctrls,
 269         .nctrls = ARRAY_SIZE(sd_ctrls),
 270         .config = sd_config,
 271         .init = sd_init,
 272         .isoc_init = sd_isoc_init,
 273         .start = sd_start,
 274         .stopN = sd_stopN,
 275         .pkt_scan = sd_pkt_scan,
 276 };
 277
 278 /* -- module initialisation -- */
 279 static const struct usb_device_id device_table[] = {
 280         {USB_DEVICE(0x04a5, 0x3035)},
 281         {}
 282 };
 283 MODULE_DEVICE_TABLE(usb, device_table);
 284
 285 /* -- device connect -- */
 286 static int sd_probe(struct usb_interface *intf,
 287                         const struct usb_device_id *id)
 288 {
 289         return gspca_dev_probe(intf, id, &sd_desc, sizeof(struct sd),
 290                                 THIS_MODULE);
 291 }
 292
 293 static struct usb_driver sd_driver = {
 294         .name = MODULE_NAME,
 295         .id_table = device_table,
 296         .probe = sd_probe,
 297         .disconnect = gspca_disconnect,
 298 #ifdef CONFIG_PM
 299         .suspend = gspca_suspend,
 300         .resume = gspca_resume,
 301 #endif
 302 };
 303
 304 /* -- module insert / remove -- */
 305 static int __init sd_mod_init(void)
 306 {
 307         return usb_register(&sd_driver);
 308 }
 309 static void __exit sd_mod_exit(void)
 310 {
 311         usb_deregister(&sd_driver);
 312 }
 313
 314 module_init(sd_mod_init);
 315 module_exit(sd_mod_exit);