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