drivers/media/video/gspca/m5602/m5602_core.c

   1  /*
   2  * USB Driver for ALi m5602 based webcams
   3  *
   4  * Copyright (C) 2008 Erik Andrén
   5  * Copyright (C) 2007 Ilyes Gouta. Based on the m5603x Linux Driver Project.
   6  * Copyright (C) 2005 m5603x Linux Driver Project <m5602@x3ng.com.br>
   7  *
   8  * Portions of code to USB interface and ALi driver software,
   9  * Copyright (c) 2006 Willem Duinker
  10  * v4l2 interface modeled after the V4L2 driver
  11  * for SN9C10x PC Camera Controllers
  12  *
  13  * This program is free software; you can redistribute it and/or
  14  * modify it under the terms of the GNU General Public License as
  15  * published by the Free Software Foundation, version 2.
  16  *
  17  */
  18
  19 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  20
  21 #include "m5602_ov9650.h"
  22 #include "m5602_ov7660.h"
  23 #include "m5602_mt9m111.h"
  24 #include "m5602_po1030.h"
  25 #include "m5602_s5k83a.h"
  26 #include "m5602_s5k4aa.h"
  27
  28 /* Kernel module parameters */
  29 int force_sensor;
  30 static bool dump_bridge;
  31 bool dump_sensor;
  32
  33 static const struct usb_device_id m5602_table[] = {
  34         {USB_DEVICE(0x0402, 0x5602)},
  35         {}
  36 };
  37
  38 MODULE_DEVICE_TABLE(usb, m5602_table);
  39
  40 /* Reads a byte from the m5602 */
  41 int m5602_read_bridge(struct sd *sd, const u8 address, u8 *i2c_data)
  42 {
  43         int err;
  44         struct usb_device *udev = sd->gspca_dev.dev;
  45         __u8 *buf = sd->gspca_dev.usb_buf;
  46
  47         err = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
  48                               0x04, 0xc0, 0x14,
  49                               0x8100 + address, buf,
  50                               1, M5602_URB_MSG_TIMEOUT);
  51         *i2c_data = buf[0];
  52
  53         PDEBUG(D_CONF, "Reading bridge register 0x%x containing 0x%x",
  54                address, *i2c_data);
  55
  56         /* usb_control_msg(...) returns the number of bytes sent upon success,
  57         mask that and return zero instead*/
  58         return (err < 0) ? err : 0;
  59 }
  60
  61 /* Writes a byte to the m5602 */
  62 int m5602_write_bridge(struct sd *sd, const u8 address, const u8 i2c_data)
  63 {
  64         int err;
  65         struct usb_device *udev = sd->gspca_dev.dev;
  66         __u8 *buf = sd->gspca_dev.usb_buf;
  67
  68         PDEBUG(D_CONF, "Writing bridge register 0x%x with 0x%x",
  69                address, i2c_data);
  70
  71         memcpy(buf, bridge_urb_skeleton,
  72                sizeof(bridge_urb_skeleton));
  73         buf[1] = address;
  74         buf[3] = i2c_data;
  75
  76         err = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
  77                                 0x04, 0x40, 0x19,
  78                                 0x0000, buf,
  79                                 4, M5602_URB_MSG_TIMEOUT);
  80
  81         /* usb_control_msg(...) returns the number of bytes sent upon success,
  82            mask that and return zero instead */
  83         return (err < 0) ? err : 0;
  84 }
  85
  86 static int m5602_wait_for_i2c(struct sd *sd)
  87 {
  88         int err;
  89         u8 data;
  90
  91         do {
  92                 err = m5602_read_bridge(sd, M5602_XB_I2C_STATUS, &data);
  93         } while ((data & I2C_BUSY) && !err);
  94         return err;
  95 }
  96
  97 int m5602_read_sensor(struct sd *sd, const u8 address,
  98                        u8 *i2c_data, const u8 len)
  99 {
 100         int err, i;
 101
 102         if (!len || len > sd->sensor->i2c_regW)
 103                 return -EINVAL;
 104
 105         err = m5602_wait_for_i2c(sd);
 106         if (err < 0)
 107                 return err;
 108
 109         err = m5602_write_bridge(sd, M5602_XB_I2C_DEV_ADDR,
 110                                  sd->sensor->i2c_slave_id);
 111         if (err < 0)
 112                 return err;
 113
 114         err = m5602_write_bridge(sd, M5602_XB_I2C_REG_ADDR, address);
 115         if (err < 0)
 116                 return err;
 117
 118         /* Sensors with registers that are of only
 119            one byte width are differently read */
 120
 121         /* FIXME: This works with the ov9650, but has issues with the po1030 */
 122         if (sd->sensor->i2c_regW == 1) {
 123                 err = m5602_write_bridge(sd, M5602_XB_I2C_CTRL, 1);
 124                 if (err < 0)
 125                         return err;
 126
 127                 err = m5602_write_bridge(sd, M5602_XB_I2C_CTRL, 0x08);
 128         } else {
 129                 err = m5602_write_bridge(sd, M5602_XB_I2C_CTRL, 0x18 + len);
 130         }
 131
 132         for (i = 0; (i < len) && !err; i++) {
 133                 err = m5602_wait_for_i2c(sd);
 134                 if (err < 0)
 135                         return err;
 136
 137                 err = m5602_read_bridge(sd, M5602_XB_I2C_DATA, &(i2c_data[i]));
 138
 139                 PDEBUG(D_CONF, "Reading sensor register "
 140                                "0x%x containing 0x%x ", address, *i2c_data);
 141         }
 142         return err;
 143 }
 144
 145 int m5602_write_sensor(struct sd *sd, const u8 address,
 146                         u8 *i2c_data, const u8 len)
 147 {
 148         int err, i;
 149         u8 *p;
 150         struct usb_device *udev = sd->gspca_dev.dev;
 151         __u8 *buf = sd->gspca_dev.usb_buf;
 152
 153         /* No sensor with a data width larger than 16 bits has yet been seen */
 154         if (len > sd->sensor->i2c_regW || !len)
 155                 return -EINVAL;
 156
 157         memcpy(buf, sensor_urb_skeleton,
 158                sizeof(sensor_urb_skeleton));
 159
 160         buf[11] = sd->sensor->i2c_slave_id;
 161         buf[15] = address;
 162
 163         /* Special case larger sensor writes */
 164         p = buf + 16;
 165
 166         /* Copy a four byte write sequence for each byte to be written to */
 167         for (i = 0; i < len; i++) {
 168                 memcpy(p, sensor_urb_skeleton + 16, 4);
 169                 p[3] = i2c_data[i];
 170                 p += 4;
 171                 PDEBUG(D_CONF, "Writing sensor register 0x%x with 0x%x",
 172                        address, i2c_data[i]);
 173         }
 174
 175         /* Copy the tailer */
 176         memcpy(p, sensor_urb_skeleton + 20, 4);
 177
 178         /* Set the total length */
 179         p[3] = 0x10 + len;
 180
 181         err = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 182                               0x04, 0x40, 0x19,
 183                               0x0000, buf,
 184                               20 + len * 4, M5602_URB_MSG_TIMEOUT);
 185
 186         return (err < 0) ? err : 0;
 187 }
 188
 189 /* Dump all the registers of the m5602 bridge,
 190    unfortunately this breaks the camera until it's power cycled */
 191 static void m5602_dump_bridge(struct sd *sd)
 192 {
 193         int i;
 194         for (i = 0; i < 0x80; i++) {
 195                 unsigned char val = 0;
 196                 m5602_read_bridge(sd, i, &val);
 197                 pr_info("ALi m5602 address 0x%x contains 0x%x\n", i, val);
 198         }
 199         pr_info("Warning: The ALi m5602 webcam probably won't work until it's power cycled\n");
 200 }
 201
 202 static int m5602_probe_sensor(struct sd *sd)
 203 {
 204         /* Try the po1030 */
 205         sd->sensor = &po1030;
 206         if (!sd->sensor->probe(sd))
 207                 return 0;
 208
 209         /* Try the mt9m111 sensor */
 210         sd->sensor = &mt9m111;
 211         if (!sd->sensor->probe(sd))
 212                 return 0;
 213
 214         /* Try the s5k4aa */
 215         sd->sensor = &s5k4aa;
 216         if (!sd->sensor->probe(sd))
 217                 return 0;
 218
 219         /* Try the ov9650 */
 220         sd->sensor = &ov9650;
 221         if (!sd->sensor->probe(sd))
 222                 return 0;
 223
 224         /* Try the ov7660 */
 225         sd->sensor = &ov7660;
 226         if (!sd->sensor->probe(sd))
 227                 return 0;
 228
 229         /* Try the s5k83a */
 230         sd->sensor = &s5k83a;
 231         if (!sd->sensor->probe(sd))
 232                 return 0;
 233
 234         /* More sensor probe function goes here */
 235         pr_info("Failed to find a sensor\n");
 236         sd->sensor = NULL;
 237         return -ENODEV;
 238 }
 239
 240 static int m5602_configure(struct gspca_dev *gspca_dev,
 241                            const struct usb_device_id *id);
 242
 243 static int m5602_init(struct gspca_dev *gspca_dev)
 244 {
 245         struct sd *sd = (struct sd *) gspca_dev;
 246         int err;
 247
 248         PDEBUG(D_CONF, "Initializing ALi m5602 webcam");
 249         /* Run the init sequence */
 250         err = sd->sensor->init(sd);
 251
 252         return err;
 253 }
 254
 255 static int m5602_start_transfer(struct gspca_dev *gspca_dev)
 256 {
 257         struct sd *sd = (struct sd *) gspca_dev;
 258         __u8 *buf = sd->gspca_dev.usb_buf;
 259         int err;
 260
 261         /* Send start command to the camera */
 262         const u8 buffer[4] = {0x13, 0xf9, 0x0f, 0x01};
 263
 264         if (sd->sensor->start)
 265                 sd->sensor->start(sd);
 266
 267         memcpy(buf, buffer, sizeof(buffer));
 268         err = usb_control_msg(gspca_dev->dev,
 269                               usb_sndctrlpipe(gspca_dev->dev, 0),
 270                               0x04, 0x40, 0x19, 0x0000, buf,
 271                               sizeof(buffer), M5602_URB_MSG_TIMEOUT);
 272
 273         PDEBUG(D_STREAM, "Transfer started");
 274         return (err < 0) ? err : 0;
 275 }
 276
 277 static void m5602_urb_complete(struct gspca_dev *gspca_dev,
 278                                 u8 *data, int len)
 279 {
 280         struct sd *sd = (struct sd *) gspca_dev;
 281
 282         if (len < 6) {
 283                 PDEBUG(D_PACK, "Packet is less than 6 bytes");
 284                 return;
 285         }
 286
 287         /* Frame delimiter: ff xx xx xx ff ff */
 288         if (data[0] == 0xff && data[4] == 0xff && data[5] == 0xff &&
 289             data[2] != sd->frame_id) {
 290                 PDEBUG(D_FRAM, "Frame delimiter detected");
 291                 sd->frame_id = data[2];
 292
 293                 /* Remove the extra fluff appended on each header */
 294                 data += 6;
 295                 len -= 6;
 296
 297                 /* Complete the last frame (if any) */
 298                 gspca_frame_add(gspca_dev, LAST_PACKET,
 299                                 NULL, 0);
 300                 sd->frame_count++;
 301
 302                 /* Create a new frame */
 303                 gspca_frame_add(gspca_dev, FIRST_PACKET, data, len);
 304
 305                 PDEBUG(D_FRAM, "Starting new frame %d",
 306                        sd->frame_count);
 307
 308         } else {
 309                 int cur_frame_len;
 310
 311                 cur_frame_len = gspca_dev->image_len;
 312                 /* Remove urb header */
 313                 data += 4;
 314                 len -= 4;
 315
 316                 if (cur_frame_len + len <= gspca_dev->frsz) {
 317                         PDEBUG(D_FRAM, "Continuing frame %d copying %d bytes",
 318                                sd->frame_count, len);
 319
 320                         gspca_frame_add(gspca_dev, INTER_PACKET,
 321                                         data, len);
 322                 } else {
 323                         /* Add the remaining data up to frame size */
 324                         gspca_frame_add(gspca_dev, INTER_PACKET, data,
 325                                     gspca_dev->frsz - cur_frame_len);
 326                 }
 327         }
 328 }
 329
 330 static void m5602_stop_transfer(struct gspca_dev *gspca_dev)
 331 {
 332         struct sd *sd = (struct sd *) gspca_dev;
 333
 334         /* Run the sensor specific end transfer sequence */
 335         if (sd->sensor->stop)
 336                 sd->sensor->stop(sd);
 337 }
 338
 339 /* sub-driver description, the ctrl and nctrl is filled at probe time */
 340 static struct sd_desc sd_desc = {
 341         .name           = MODULE_NAME,
 342         .config         = m5602_configure,
 343         .init           = m5602_init,
 344         .start          = m5602_start_transfer,
 345         .stopN          = m5602_stop_transfer,
 346         .pkt_scan       = m5602_urb_complete
 347 };
 348
 349 /* this function is called at probe time */
 350 static int m5602_configure(struct gspca_dev *gspca_dev,
 351                            const struct usb_device_id *id)
 352 {
 353         struct sd *sd = (struct sd *) gspca_dev;
 354         struct cam *cam;
 355         int err;
 356
 357         cam = &gspca_dev->cam;
 358         sd->desc = &sd_desc;
 359
 360         if (dump_bridge)
 361                 m5602_dump_bridge(sd);
 362
 363         /* Probe sensor */
 364         err = m5602_probe_sensor(sd);
 365         if (err)
 366                 goto fail;
 367
 368         return 0;
 369
 370 fail:
 371         PDEBUG(D_ERR, "ALi m5602 webcam failed");
 372         cam->cam_mode = NULL;
 373         cam->nmodes = 0;
 374
 375         return err;
 376 }
 377
 378 static int m5602_probe(struct usb_interface *intf,
 379                        const struct usb_device_id *id)
 380 {
 381         return gspca_dev_probe(intf, id, &sd_desc, sizeof(struct sd),
 382                                THIS_MODULE);
 383 }
 384
 385 static void m5602_disconnect(struct usb_interface *intf)
 386 {
 387         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
 388         struct sd *sd = (struct sd *) gspca_dev;
 389
 390         if (sd->sensor->disconnect)
 391                 sd->sensor->disconnect(sd);
 392
 393         gspca_disconnect(intf);
 394 }
 395
 396 static struct usb_driver sd_driver = {
 397         .name = MODULE_NAME,
 398         .id_table = m5602_table,
 399         .probe = m5602_probe,
 400 #ifdef CONFIG_PM
 401         .suspend = gspca_suspend,
 402         .resume = gspca_resume,
 403 #endif
 404         .disconnect = m5602_disconnect
 405 };
 406
 407 module_usb_driver(sd_driver);
 408
 409 MODULE_AUTHOR(DRIVER_AUTHOR);
 410 MODULE_DESCRIPTION(DRIVER_DESC);
 411 MODULE_LICENSE("GPL");
 412 module_param(force_sensor, int, S_IRUGO | S_IWUSR);
 413 MODULE_PARM_DESC(force_sensor,
 414                 "forces detection of a sensor, "
 415                 "1 = OV9650, 2 = S5K83A, 3 = S5K4AA, "
 416                 "4 = MT9M111, 5 = PO1030, 6 = OV7660");
 417
 418 module_param(dump_bridge, bool, S_IRUGO | S_IWUSR);
 419 MODULE_PARM_DESC(dump_bridge, "Dumps all usb bridge registers at startup");
 420
 421 module_param(dump_sensor, bool, S_IRUGO | S_IWUSR);
 422 MODULE_PARM_DESC(dump_sensor, "Dumps all usb sensor registers "
 423                 "at startup providing a sensor is found");