root/drivers/media/usb/gspca/stv0680.c

DEFINITIONS

1. stv_sndctrl
2. stv0680_handle_error
3. stv0680_get_video_mode
4. stv0680_set_video_mode
5. sd_config
6. sd_init
7. sd_start
8. sd_stopN
9. sd_stop0
10. sd_pkt_scan
11. sd_probe

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * STV0680 USB Camera Driver
   4  *
   5  * Copyright (C) 2009 Hans de Goede <hdegoede@redhat.com>
   6  *
   7  * This module is adapted from the in kernel v4l1 stv680 driver:
   8  *
   9  *  STV0680 USB Camera Driver, by Kevin Sisson (kjsisson@bellsouth.net)
  10  *
  11  * Thanks to STMicroelectronics for information on the usb commands, and
  12  * to Steve Miller at STM for his help and encouragement while I was
  13  * writing this driver.
  14  */
  15 
  16 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  17 
  18 #define MODULE_NAME "stv0680"
  19 
  20 #include "gspca.h"
  21 
  22 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
  23 MODULE_DESCRIPTION("STV0680 USB Camera Driver");
  24 MODULE_LICENSE("GPL");
  25 
  26 /* specific webcam descriptor */
  27 struct sd {
  28         struct gspca_dev gspca_dev;             /* !! must be the first item */
  29         struct v4l2_pix_format mode;
  30         u8 orig_mode;
  31         u8 video_mode;
  32         u8 current_mode;
  33 };
  34 
  35 static int stv_sndctrl(struct gspca_dev *gspca_dev, int set, u8 req, u16 val,
  36                        int size)
  37 {
  38         int ret = -1;
  39         u8 req_type = 0;
  40         unsigned int pipe = 0;
  41 
  42         switch (set) {
  43         case 0: /*  0xc1  */
  44                 req_type = USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_ENDPOINT;
  45                 pipe = usb_rcvctrlpipe(gspca_dev->dev, 0);
  46                 break;
  47         case 1: /*  0x41  */
  48                 req_type = USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_ENDPOINT;
  49                 pipe = usb_sndctrlpipe(gspca_dev->dev, 0);
  50                 break;
  51         case 2: /*  0x80  */
  52                 req_type = USB_DIR_IN | USB_RECIP_DEVICE;
  53                 pipe = usb_rcvctrlpipe(gspca_dev->dev, 0);
  54                 break;
  55         case 3: /*  0x40  */
  56                 req_type = USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE;
  57                 pipe = usb_sndctrlpipe(gspca_dev->dev, 0);
  58                 break;
  59         }
  60 
  61         ret = usb_control_msg(gspca_dev->dev, pipe,
  62                               req, req_type,
  63                               val, 0, gspca_dev->usb_buf, size, 500);
  64 
  65         if ((ret < 0) && (req != 0x0a))
  66                 pr_err("usb_control_msg error %i, request = 0x%x, error = %i\n",
  67                        set, req, ret);
  68 
  69         return ret;
  70 }
  71 
  72 static int stv0680_handle_error(struct gspca_dev *gspca_dev, int ret)
  73 {
  74         stv_sndctrl(gspca_dev, 0, 0x80, 0, 0x02); /* Get Last Error */
  75         gspca_err(gspca_dev, "last error: %i,  command = 0x%x\n",
  76                   gspca_dev->usb_buf[0], gspca_dev->usb_buf[1]);
  77         return ret;
  78 }
  79 
  80 static int stv0680_get_video_mode(struct gspca_dev *gspca_dev)
  81 {
  82         /* Note not sure if this init of usb_buf is really necessary */
  83         memset(gspca_dev->usb_buf, 0, 8);
  84         gspca_dev->usb_buf[0] = 0x0f;
  85 
  86         if (stv_sndctrl(gspca_dev, 0, 0x87, 0, 0x08) != 0x08) {
  87                 gspca_err(gspca_dev, "Get_Camera_Mode failed\n");
  88                 return stv0680_handle_error(gspca_dev, -EIO);
  89         }
  90 
  91         return gspca_dev->usb_buf[0]; /* 01 = VGA, 03 = QVGA, 00 = CIF */
  92 }
  93 
  94 static int stv0680_set_video_mode(struct gspca_dev *gspca_dev, u8 mode)
  95 {
  96         struct sd *sd = (struct sd *) gspca_dev;
  97 
  98         if (sd->current_mode == mode)
  99                 return 0;
 100 
 101         memset(gspca_dev->usb_buf, 0, 8);
 102         gspca_dev->usb_buf[0] = mode;
 103 
 104         if (stv_sndctrl(gspca_dev, 3, 0x07, 0x0100, 0x08) != 0x08) {
 105                 gspca_err(gspca_dev, "Set_Camera_Mode failed\n");
 106                 return stv0680_handle_error(gspca_dev, -EIO);
 107         }
 108 
 109         /* Verify we got what we've asked for */
 110         if (stv0680_get_video_mode(gspca_dev) != mode) {
 111                 gspca_err(gspca_dev, "Error setting camera video mode!\n");
 112                 return -EIO;
 113         }
 114 
 115         sd->current_mode = mode;
 116 
 117         return 0;
 118 }
 119 
 120 /* this function is called at probe time */
 121 static int sd_config(struct gspca_dev *gspca_dev,
 122                         const struct usb_device_id *id)
 123 {
 124         int ret;
 125         struct sd *sd = (struct sd *) gspca_dev;
 126         struct cam *cam = &gspca_dev->cam;
 127 
 128         /* Give the camera some time to settle, otherwise initialization will
 129            fail on hotplug, and yes it really needs a full second. */
 130         msleep(1000);
 131 
 132         /* ping camera to be sure STV0680 is present */
 133         if (stv_sndctrl(gspca_dev, 0, 0x88, 0x5678, 0x02) != 0x02 ||
 134             gspca_dev->usb_buf[0] != 0x56 || gspca_dev->usb_buf[1] != 0x78) {
 135                 gspca_err(gspca_dev, "STV(e): camera ping failed!!\n");
 136                 return stv0680_handle_error(gspca_dev, -ENODEV);
 137         }
 138 
 139         /* get camera descriptor */
 140         if (stv_sndctrl(gspca_dev, 2, 0x06, 0x0200, 0x09) != 0x09)
 141                 return stv0680_handle_error(gspca_dev, -ENODEV);
 142 
 143         if (stv_sndctrl(gspca_dev, 2, 0x06, 0x0200, 0x22) != 0x22 ||
 144             gspca_dev->usb_buf[7] != 0xa0 || gspca_dev->usb_buf[8] != 0x23) {
 145                 gspca_err(gspca_dev, "Could not get descriptor 0200\n");
 146                 return stv0680_handle_error(gspca_dev, -ENODEV);
 147         }
 148         if (stv_sndctrl(gspca_dev, 0, 0x8a, 0, 0x02) != 0x02)
 149                 return stv0680_handle_error(gspca_dev, -ENODEV);
 150         if (stv_sndctrl(gspca_dev, 0, 0x8b, 0, 0x24) != 0x24)
 151                 return stv0680_handle_error(gspca_dev, -ENODEV);
 152         if (stv_sndctrl(gspca_dev, 0, 0x85, 0, 0x10) != 0x10)
 153                 return stv0680_handle_error(gspca_dev, -ENODEV);
 154 
 155         if (!(gspca_dev->usb_buf[7] & 0x09)) {
 156                 gspca_err(gspca_dev, "Camera supports neither CIF nor QVGA mode\n");
 157                 return -ENODEV;
 158         }
 159         if (gspca_dev->usb_buf[7] & 0x01)
 160                 gspca_dbg(gspca_dev, D_PROBE, "Camera supports CIF mode\n");
 161         if (gspca_dev->usb_buf[7] & 0x02)
 162                 gspca_dbg(gspca_dev, D_PROBE, "Camera supports VGA mode\n");
 163         if (gspca_dev->usb_buf[7] & 0x04)
 164                 gspca_dbg(gspca_dev, D_PROBE, "Camera supports QCIF mode\n");
 165         if (gspca_dev->usb_buf[7] & 0x08)
 166                 gspca_dbg(gspca_dev, D_PROBE, "Camera supports QVGA mode\n");
 167 
 168         if (gspca_dev->usb_buf[7] & 0x01)
 169                 sd->video_mode = 0x00; /* CIF */
 170         else
 171                 sd->video_mode = 0x03; /* QVGA */
 172 
 173         /* FW rev, ASIC rev, sensor ID  */
 174         gspca_dbg(gspca_dev, D_PROBE, "Firmware rev is %i.%i\n",
 175                   gspca_dev->usb_buf[0], gspca_dev->usb_buf[1]);
 176         gspca_dbg(gspca_dev, D_PROBE, "ASIC rev is %i.%i",
 177                   gspca_dev->usb_buf[2], gspca_dev->usb_buf[3]);
 178         gspca_dbg(gspca_dev, D_PROBE, "Sensor ID is %i",
 179                   (gspca_dev->usb_buf[4]*16) + (gspca_dev->usb_buf[5]>>4));
 180 
 181 
 182         ret = stv0680_get_video_mode(gspca_dev);
 183         if (ret < 0)
 184                 return ret;
 185         sd->current_mode = sd->orig_mode = ret;
 186 
 187         ret = stv0680_set_video_mode(gspca_dev, sd->video_mode);
 188         if (ret < 0)
 189                 return ret;
 190 
 191         /* Get mode details */
 192         if (stv_sndctrl(gspca_dev, 0, 0x8f, 0, 0x10) != 0x10)
 193                 return stv0680_handle_error(gspca_dev, -EIO);
 194 
 195         cam->bulk = 1;
 196         cam->bulk_nurbs = 1; /* The cam cannot handle more */
 197         cam->bulk_size = (gspca_dev->usb_buf[0] << 24) |
 198                          (gspca_dev->usb_buf[1] << 16) |
 199                          (gspca_dev->usb_buf[2] << 8) |
 200                          (gspca_dev->usb_buf[3]);
 201         sd->mode.width = (gspca_dev->usb_buf[4] << 8) |
 202                          (gspca_dev->usb_buf[5]);  /* 322, 356, 644 */
 203         sd->mode.height = (gspca_dev->usb_buf[6] << 8) |
 204                           (gspca_dev->usb_buf[7]); /* 242, 292, 484 */
 205         sd->mode.pixelformat = V4L2_PIX_FMT_STV0680;
 206         sd->mode.field = V4L2_FIELD_NONE;
 207         sd->mode.bytesperline = sd->mode.width;
 208         sd->mode.sizeimage = cam->bulk_size;
 209         sd->mode.colorspace = V4L2_COLORSPACE_SRGB;
 210 
 211         /* origGain = gspca_dev->usb_buf[12]; */
 212 
 213         cam->cam_mode = &sd->mode;
 214         cam->nmodes = 1;
 215 
 216 
 217         ret = stv0680_set_video_mode(gspca_dev, sd->orig_mode);
 218         if (ret < 0)
 219                 return ret;
 220 
 221         if (stv_sndctrl(gspca_dev, 2, 0x06, 0x0100, 0x12) != 0x12 ||
 222             gspca_dev->usb_buf[8] != 0x53 || gspca_dev->usb_buf[9] != 0x05) {
 223                 pr_err("Could not get descriptor 0100\n");
 224                 return stv0680_handle_error(gspca_dev, -EIO);
 225         }
 226 
 227         return 0;
 228 }
 229 
 230 /* this function is called at probe and resume time */
 231 static int sd_init(struct gspca_dev *gspca_dev)
 232 {
 233         return 0;
 234 }
 235 
 236 /* -- start the camera -- */
 237 static int sd_start(struct gspca_dev *gspca_dev)
 238 {
 239         int ret;
 240         struct sd *sd = (struct sd *) gspca_dev;
 241 
 242         ret = stv0680_set_video_mode(gspca_dev, sd->video_mode);
 243         if (ret < 0)
 244                 return ret;
 245 
 246         if (stv_sndctrl(gspca_dev, 0, 0x85, 0, 0x10) != 0x10)
 247                 return stv0680_handle_error(gspca_dev, -EIO);
 248 
 249         /* Start stream at:
 250            0x0000 = CIF (352x288)
 251            0x0100 = VGA (640x480)
 252            0x0300 = QVGA (320x240) */
 253         if (stv_sndctrl(gspca_dev, 1, 0x09, sd->video_mode << 8, 0x0) != 0x0)
 254                 return stv0680_handle_error(gspca_dev, -EIO);
 255 
 256         return 0;
 257 }
 258 
 259 static void sd_stopN(struct gspca_dev *gspca_dev)
 260 {
 261         /* This is a high priority command; it stops all lower order cmds */
 262         if (stv_sndctrl(gspca_dev, 1, 0x04, 0x0000, 0x0) != 0x0)
 263                 stv0680_handle_error(gspca_dev, -EIO);
 264 }
 265 
 266 static void sd_stop0(struct gspca_dev *gspca_dev)
 267 {
 268         struct sd *sd = (struct sd *) gspca_dev;
 269 
 270         if (!sd->gspca_dev.present)
 271                 return;
 272 
 273         stv0680_set_video_mode(gspca_dev, sd->orig_mode);
 274 }
 275 
 276 static void sd_pkt_scan(struct gspca_dev *gspca_dev,
 277                         u8 *data,
 278                         int len)
 279 {
 280         struct sd *sd = (struct sd *) gspca_dev;
 281 
 282         /* Every now and then the camera sends a 16 byte packet, no idea
 283            what it contains, but it is not image data, when this
 284            happens the frame received before this packet is corrupt,
 285            so discard it. */
 286         if (len != sd->mode.sizeimage) {
 287                 gspca_dev->last_packet_type = DISCARD_PACKET;
 288                 return;
 289         }
 290 
 291         /* Finish the previous frame, we do this upon reception of the next
 292            packet, even though it is already complete so that the strange 16
 293            byte packets send after a corrupt frame can discard it. */
 294         gspca_frame_add(gspca_dev, LAST_PACKET, NULL, 0);
 295 
 296         /* Store the just received frame */
 297         gspca_frame_add(gspca_dev, FIRST_PACKET, data, len);
 298 }
 299 
 300 /* sub-driver description */
 301 static const struct sd_desc sd_desc = {
 302         .name = MODULE_NAME,
 303         .config = sd_config,
 304         .init = sd_init,
 305         .start = sd_start,
 306         .stopN = sd_stopN,
 307         .stop0 = sd_stop0,
 308         .pkt_scan = sd_pkt_scan,
 309 };
 310 
 311 /* -- module initialisation -- */
 312 static const struct usb_device_id device_table[] = {
 313         {USB_DEVICE(0x0553, 0x0202)},
 314         {USB_DEVICE(0x041e, 0x4007)},
 315         {}
 316 };
 317 MODULE_DEVICE_TABLE(usb, device_table);
 318 
 319 /* -- device connect -- */
 320 static int sd_probe(struct usb_interface *intf,
 321                         const struct usb_device_id *id)
 322 {
 323         return gspca_dev_probe(intf, id, &sd_desc, sizeof(struct sd),
 324                                 THIS_MODULE);
 325 }
 326 
 327 static struct usb_driver sd_driver = {
 328         .name = MODULE_NAME,
 329         .id_table = device_table,
 330         .probe = sd_probe,
 331         .disconnect = gspca_disconnect,
 332 #ifdef CONFIG_PM
 333         .suspend = gspca_suspend,
 334         .resume = gspca_resume,
 335         .reset_resume = gspca_resume,
 336 #endif
 337 };
 338 
 339 module_usb_driver(sd_driver);