LXR linux/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
  27MODULE_AUTHOR("Jean-Francois Moine <http://moinejf.free.fr>");
  28MODULE_DESCRIPTION("Benq DC E300 USB Camera Driver");
  29MODULE_LICENSE("GPL");
  30
  31/* specific webcam descriptor */
  32struct sd {
  33        struct gspca_dev gspca_dev;     /* !! must be the first item */
  34};
  35
  36static 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
  43static void sd_isoc_irq(struct urb *urb);
  44
  45/* -- write a register -- */
  46static 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 */
  69static 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 */
  79static int sd_init(struct gspca_dev *gspca_dev)
  80{
  81        return 0;
  82}
  83
  84/* -- start the camera -- */
  85static 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
 131static 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
 146static 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 */
 154static 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 */
 253static 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 -- */
 263static const struct usb_device_id device_table[] = {
 264        {USB_DEVICE(0x04a5, 0x3035)},
 265        {}
 266};
 267MODULE_DEVICE_TABLE(usb, device_table);
 268
 269/* -- device connect -- */
 270static 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
 277static 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
 289module_usb_driver(sd_driver);
 290