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 /* -- start the camera -- */
  90 static int sd_start(struct gspca_dev *gspca_dev)
  91 {
  92         struct urb *urb;
  93         int i, n;
  94
  95         /* create 4 URBs - 2 on endpoint 0x83 and 2 on 0x082 */
  96 #if MAX_NURBS < 4
  97 #error "Not enough URBs in the gspca table"
  98 #endif
  99 #define SD_PKT_SZ 64
 100 #define SD_NPKT 32
 101         for (n = 0; n < 4; n++) {
 102                 urb = usb_alloc_urb(SD_NPKT, GFP_KERNEL);
 103                 if (!urb) {
 104                         pr_err("usb_alloc_urb failed\n");
 105                         return -ENOMEM;
 106                 }
 107                 gspca_dev->urb[n] = urb;
 108                 urb->transfer_buffer = usb_alloc_coherent(gspca_dev->dev,
 109                                                 SD_PKT_SZ * SD_NPKT,
 110                                                 GFP_KERNEL,
 111                                                 &urb->transfer_dma);
 112
 113                 if (urb->transfer_buffer == NULL) {
 114                         pr_err("usb_alloc_coherent failed\n");
 115                         return -ENOMEM;
 116                 }
 117                 urb->dev = gspca_dev->dev;
 118                 urb->context = gspca_dev;
 119                 urb->transfer_buffer_length = SD_PKT_SZ * SD_NPKT;
 120                 urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
 121                                         n & 1 ? 0x82 : 0x83);
 122                 urb->transfer_flags = URB_ISO_ASAP
 123                                         | URB_NO_TRANSFER_DMA_MAP;
 124                 urb->interval = 1;
 125                 urb->complete = sd_isoc_irq;
 126                 urb->number_of_packets = SD_NPKT;
 127                 for (i = 0; i < SD_NPKT; i++) {
 128                         urb->iso_frame_desc[i].length = SD_PKT_SZ;
 129                         urb->iso_frame_desc[i].offset = SD_PKT_SZ * i;
 130                 }
 131         }
 132
 133         return gspca_dev->usb_err;
 134 }
 135
 136 static void sd_stopN(struct gspca_dev *gspca_dev)
 137 {
 138         reg_w(gspca_dev, 0x003c, 0x0003);
 139         reg_w(gspca_dev, 0x003c, 0x0004);
 140         reg_w(gspca_dev, 0x003c, 0x0005);
 141         reg_w(gspca_dev, 0x003c, 0x0006);
 142         reg_w(gspca_dev, 0x003c, 0x0007);
 143         usb_set_interface(gspca_dev->dev, gspca_dev->iface,
 144                                         gspca_dev->nbalt - 1);
 145 }
 146
 147 static void sd_pkt_scan(struct gspca_dev *gspca_dev,
 148                         u8 *data,               /* isoc packet */
 149                         int len)                /* iso packet length */
 150 {
 151         /* unused */
 152 }
 153
 154 /* reception of an URB */
 155 static void sd_isoc_irq(struct urb *urb)
 156 {
 157         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 158         struct urb *urb0;
 159         u8 *data;
 160         int i, st;
 161
 162         PDEBUG(D_PACK, "sd isoc irq");
 163         if (!gspca_dev->streaming)
 164                 return;
 165         if (urb->status != 0) {
 166                 if (urb->status == -ESHUTDOWN)
 167                         return;         /* disconnection */
 168 #ifdef CONFIG_PM
 169                 if (gspca_dev->frozen)
 170                         return;
 171 #endif
 172                 pr_err("urb status: %d\n", urb->status);
 173                 return;
 174         }
 175
 176         /* if this is a control URN (ep 0x83), wait */
 177         if (urb == gspca_dev->urb[0] || urb == gspca_dev->urb[2])
 178                 return;
 179
 180         /* scan both received URBs */
 181         if (urb == gspca_dev->urb[1])
 182                 urb0 = gspca_dev->urb[0];
 183         else
 184                 urb0 = gspca_dev->urb[2];
 185         for (i = 0; i < urb->number_of_packets; i++) {
 186
 187                 /* check the packet status and length */
 188                 if (urb0->iso_frame_desc[i].actual_length != SD_PKT_SZ
 189                     || urb->iso_frame_desc[i].actual_length != SD_PKT_SZ) {
 190                         PDEBUG(D_ERR, "ISOC bad lengths %d / %d",
 191                                 urb0->iso_frame_desc[i].actual_length,
 192                                 urb->iso_frame_desc[i].actual_length);
 193                         gspca_dev->last_packet_type = DISCARD_PACKET;
 194                         continue;
 195                 }
 196                 st = urb0->iso_frame_desc[i].status;
 197                 if (st == 0)
 198                         st = urb->iso_frame_desc[i].status;
 199                 if (st) {
 200                         pr_err("ISOC data error: [%d] status=%d\n",
 201                                 i, st);
 202                         gspca_dev->last_packet_type = DISCARD_PACKET;
 203                         continue;
 204                 }
 205
 206                 /*
 207                  * The images are received in URBs of different endpoints
 208                  * (0x83 and 0x82).
 209                  * Image pieces in URBs of ep 0x83 are continuated in URBs of
 210                  * ep 0x82 of the same index.
 211                  * The packets in the URBs of endpoint 0x83 start with:
 212                  *      - 80 ba/bb 00 00 = start of image followed by 'ff d8'
 213                  *      - 04 ba/bb oo oo = image piece
 214                  *              where 'oo oo' is the image offset
 215                                                 (not cheked)
 216                  *      - (other -> bad frame)
 217                  * The images are JPEG encoded with full header and
 218                  * normal ff escape.
 219                  * The end of image ('ff d9') may occur in any URB.
 220                  * (not cheked)
 221                  */
 222                 data = (u8 *) urb0->transfer_buffer
 223                                         + urb0->iso_frame_desc[i].offset;
 224                 if (data[0] == 0x80 && (data[1] & 0xfe) == 0xba) {
 225
 226                         /* new image */
 227                         gspca_frame_add(gspca_dev, LAST_PACKET,
 228                                         NULL, 0);
 229                         gspca_frame_add(gspca_dev, FIRST_PACKET,
 230                                         data + 4, SD_PKT_SZ - 4);
 231                 } else if (data[0] == 0x04 && (data[1] & 0xfe) == 0xba) {
 232                         gspca_frame_add(gspca_dev, INTER_PACKET,
 233                                         data + 4, SD_PKT_SZ - 4);
 234                 } else {
 235                         gspca_dev->last_packet_type = DISCARD_PACKET;
 236                         continue;
 237                 }
 238                 data = (u8 *) urb->transfer_buffer
 239                                         + urb->iso_frame_desc[i].offset;
 240                         gspca_frame_add(gspca_dev, INTER_PACKET,
 241                                         data, SD_PKT_SZ);
 242         }
 243
 244         /* resubmit the URBs */
 245         st = usb_submit_urb(urb0, GFP_ATOMIC);
 246         if (st < 0)
 247                 pr_err("usb_submit_urb(0) ret %d\n", st);
 248         st = usb_submit_urb(urb, GFP_ATOMIC);
 249         if (st < 0)
 250                 pr_err("usb_submit_urb() ret %d\n", st);
 251 }
 252
 253 /* sub-driver description */
 254 static const struct sd_desc sd_desc = {
 255         .name = MODULE_NAME,
 256         .ctrls = sd_ctrls,
 257         .nctrls = ARRAY_SIZE(sd_ctrls),
 258         .config = sd_config,
 259         .init = sd_init,
 260         .start = sd_start,
 261         .stopN = sd_stopN,
 262         .pkt_scan = sd_pkt_scan,
 263 };
 264
 265 /* -- module initialisation -- */
 266 static const struct usb_device_id device_table[] = {
 267         {USB_DEVICE(0x04a5, 0x3035)},
 268         {}
 269 };
 270 MODULE_DEVICE_TABLE(usb, device_table);
 271
 272 /* -- device connect -- */
 273 static int sd_probe(struct usb_interface *intf,
 274                         const struct usb_device_id *id)
 275 {
 276         return gspca_dev_probe(intf, id, &sd_desc, sizeof(struct sd),
 277                                 THIS_MODULE);
 278 }
 279
 280 static struct usb_driver sd_driver = {
 281         .name = MODULE_NAME,
 282         .id_table = device_table,
 283         .probe = sd_probe,
 284         .disconnect = gspca_disconnect,
 285 #ifdef CONFIG_PM
 286         .suspend = gspca_suspend,
 287         .resume = gspca_resume,
 288 #endif
 289 };
 290
 291 /* -- module insert / remove -- */
 292 static int __init sd_mod_init(void)
 293 {
 294         return usb_register(&sd_driver);
 295 }
 296 static void __exit sd_mod_exit(void)
 297 {
 298         usb_deregister(&sd_driver);
 299 }
 300
 301 module_init(sd_mod_init);
 302 module_exit(sd_mod_exit);