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