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