drivers/media/video/gspca/sq905c.c

   1 /*
   2  * SQ905C subdriver
   3  *
   4  * Copyright (C) 2009 Theodore Kilgore
   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 /*
  22  *
  23  * This driver uses work done in
  24  * libgphoto2/camlibs/digigr8, Copyright (C) Theodore Kilgore.
  25  *
  26  * This driver has also used as a base the sq905c driver
  27  * and may contain code fragments from it.
  28  */
  29
  30 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  31
  32 #define MODULE_NAME "sq905c"
  33
  34 #include <linux/workqueue.h>
  35 #include <linux/slab.h>
  36 #include "gspca.h"
  37
  38 MODULE_AUTHOR("Theodore Kilgore <kilgota@auburn.edu>");
  39 MODULE_DESCRIPTION("GSPCA/SQ905C USB Camera Driver");
  40 MODULE_LICENSE("GPL");
  41
  42 /* Default timeouts, in ms */
  43 #define SQ905C_CMD_TIMEOUT 500
  44 #define SQ905C_DATA_TIMEOUT 1000
  45
  46 /* Maximum transfer size to use. */
  47 #define SQ905C_MAX_TRANSFER 0x8000
  48
  49 #define FRAME_HEADER_LEN 0x50
  50
  51 /* Commands. These go in the "value" slot. */
  52 #define SQ905C_CLEAR   0xa0             /* clear everything */
  53 #define SQ905C_GET_ID  0x14f4           /* Read version number */
  54 #define SQ905C_CAPTURE_LOW 0xa040       /* Starts capture at 160x120 */
  55 #define SQ905C_CAPTURE_MED 0x1440       /* Starts capture at 320x240 */
  56 #define SQ905C_CAPTURE_HI 0x2840        /* Starts capture at 320x240 */
  57
  58 /* For capture, this must go in the "index" slot. */
  59 #define SQ905C_CAPTURE_INDEX 0x110f
  60
  61 /* Structure to hold all of our device specific stuff */
  62 struct sd {
  63         struct gspca_dev gspca_dev;     /* !! must be the first item */
  64         const struct v4l2_pix_format *cap_mode;
  65         /* Driver stuff */
  66         struct work_struct work_struct;
  67         struct workqueue_struct *work_thread;
  68 };
  69
  70 /*
  71  * Most of these cameras will do 640x480 and 320x240. 160x120 works
  72  * in theory but gives very poor output. Therefore, not supported.
  73  * The 0x2770:0x9050 cameras have max resolution of 320x240.
  74  */
  75 static struct v4l2_pix_format sq905c_mode[] = {
  76         { 320, 240, V4L2_PIX_FMT_SQ905C, V4L2_FIELD_NONE,
  77                 .bytesperline = 320,
  78                 .sizeimage = 320 * 240,
  79                 .colorspace = V4L2_COLORSPACE_SRGB,
  80                 .priv = 0},
  81         { 640, 480, V4L2_PIX_FMT_SQ905C, V4L2_FIELD_NONE,
  82                 .bytesperline = 640,
  83                 .sizeimage = 640 * 480,
  84                 .colorspace = V4L2_COLORSPACE_SRGB,
  85                 .priv = 0}
  86 };
  87
  88 /* Send a command to the camera. */
  89 static int sq905c_command(struct gspca_dev *gspca_dev, u16 command, u16 index)
  90 {
  91         int ret;
  92
  93         ret = usb_control_msg(gspca_dev->dev,
  94                               usb_sndctrlpipe(gspca_dev->dev, 0),
  95                               USB_REQ_SYNCH_FRAME,                /* request */
  96                               USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  97                               command, index, NULL, 0,
  98                               SQ905C_CMD_TIMEOUT);
  99         if (ret < 0) {
 100                 pr_err("%s: usb_control_msg failed (%d)\n", __func__, ret);
 101                 return ret;
 102         }
 103
 104         return 0;
 105 }
 106
 107 static int sq905c_read(struct gspca_dev *gspca_dev, u16 command, u16 index,
 108                        int size)
 109 {
 110         int ret;
 111
 112         ret = usb_control_msg(gspca_dev->dev,
 113                               usb_rcvctrlpipe(gspca_dev->dev, 0),
 114                               USB_REQ_SYNCH_FRAME,              /* request */
 115                               USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 116                               command, index, gspca_dev->usb_buf, size,
 117                               SQ905C_CMD_TIMEOUT);
 118         if (ret < 0) {
 119                 pr_err("%s: usb_control_msg failed (%d)\n", __func__, ret);
 120                 return ret;
 121         }
 122
 123         return 0;
 124 }
 125
 126 /* This function is called as a workqueue function and runs whenever the camera
 127  * is streaming data. Because it is a workqueue function it is allowed to sleep
 128  * so we can use synchronous USB calls. To avoid possible collisions with other
 129  * threads attempting to use the camera's USB interface the gspca usb_lock is
 130  * used when performing the one USB control operation inside the workqueue,
 131  * which tells the camera to close the stream. In practice the only thing
 132  * which needs to be protected against is the usb_set_interface call that
 133  * gspca makes during stream_off. Otherwise the camera doesn't provide any
 134  * controls that the user could try to change.
 135  */
 136 static void sq905c_dostream(struct work_struct *work)
 137 {
 138         struct sd *dev = container_of(work, struct sd, work_struct);
 139         struct gspca_dev *gspca_dev = &dev->gspca_dev;
 140         int bytes_left; /* bytes remaining in current frame. */
 141         int data_len;   /* size to use for the next read. */
 142         int act_len;
 143         int packet_type;
 144         int ret;
 145         u8 *buffer;
 146
 147         buffer = kmalloc(SQ905C_MAX_TRANSFER, GFP_KERNEL | GFP_DMA);
 148         if (!buffer) {
 149                 pr_err("Couldn't allocate USB buffer\n");
 150                 goto quit_stream;
 151         }
 152
 153         while (gspca_dev->present && gspca_dev->streaming) {
 154                 /* Request the header, which tells the size to download */
 155                 ret = usb_bulk_msg(gspca_dev->dev,
 156                                 usb_rcvbulkpipe(gspca_dev->dev, 0x81),
 157                                 buffer, FRAME_HEADER_LEN, &act_len,
 158                                 SQ905C_DATA_TIMEOUT);
 159                 PDEBUG(D_STREAM,
 160                         "Got %d bytes out of %d for header",
 161                         act_len, FRAME_HEADER_LEN);
 162                 if (ret < 0 || act_len < FRAME_HEADER_LEN)
 163                         goto quit_stream;
 164                 /* size is read from 4 bytes starting 0x40, little endian */
 165                 bytes_left = buffer[0x40]|(buffer[0x41]<<8)|(buffer[0x42]<<16)
 166                                         |(buffer[0x43]<<24);
 167                 PDEBUG(D_STREAM, "bytes_left = 0x%x", bytes_left);
 168                 /* We keep the header. It has other information, too. */
 169                 packet_type = FIRST_PACKET;
 170                 gspca_frame_add(gspca_dev, packet_type,
 171                                 buffer, FRAME_HEADER_LEN);
 172                 while (bytes_left > 0 && gspca_dev->present) {
 173                         data_len = bytes_left > SQ905C_MAX_TRANSFER ?
 174                                 SQ905C_MAX_TRANSFER : bytes_left;
 175                         ret = usb_bulk_msg(gspca_dev->dev,
 176                                 usb_rcvbulkpipe(gspca_dev->dev, 0x81),
 177                                 buffer, data_len, &act_len,
 178                                 SQ905C_DATA_TIMEOUT);
 179                         if (ret < 0 || act_len < data_len)
 180                                 goto quit_stream;
 181                         PDEBUG(D_STREAM,
 182                                 "Got %d bytes out of %d for frame",
 183                                 data_len, bytes_left);
 184                         bytes_left -= data_len;
 185                         if (bytes_left == 0)
 186                                 packet_type = LAST_PACKET;
 187                         else
 188                                 packet_type = INTER_PACKET;
 189                         gspca_frame_add(gspca_dev, packet_type,
 190                                         buffer, data_len);
 191                 }
 192         }
 193 quit_stream:
 194         if (gspca_dev->present) {
 195                 mutex_lock(&gspca_dev->usb_lock);
 196                 sq905c_command(gspca_dev, SQ905C_CLEAR, 0);
 197                 mutex_unlock(&gspca_dev->usb_lock);
 198         }
 199         kfree(buffer);
 200 }
 201
 202 /* This function is called at probe time just before sd_init */
 203 static int sd_config(struct gspca_dev *gspca_dev,
 204                 const struct usb_device_id *id)
 205 {
 206         struct cam *cam = &gspca_dev->cam;
 207         struct sd *dev = (struct sd *) gspca_dev;
 208         int ret;
 209
 210         PDEBUG(D_PROBE,
 211                 "SQ9050 camera detected"
 212                 " (vid/pid 0x%04X:0x%04X)", id->idVendor, id->idProduct);
 213
 214         ret = sq905c_command(gspca_dev, SQ905C_GET_ID, 0);
 215         if (ret < 0) {
 216                 PDEBUG(D_ERR, "Get version command failed");
 217                 return ret;
 218         }
 219
 220         ret = sq905c_read(gspca_dev, 0xf5, 0, 20);
 221         if (ret < 0) {
 222                 PDEBUG(D_ERR, "Reading version command failed");
 223                 return ret;
 224         }
 225         /* Note we leave out the usb id and the manufacturing date */
 226         PDEBUG(D_PROBE,
 227                "SQ9050 ID string: %02x - %02x %02x %02x %02x %02x %02x",
 228                 gspca_dev->usb_buf[3],
 229                 gspca_dev->usb_buf[14], gspca_dev->usb_buf[15],
 230                 gspca_dev->usb_buf[16], gspca_dev->usb_buf[17],
 231                 gspca_dev->usb_buf[18], gspca_dev->usb_buf[19]);
 232
 233         cam->cam_mode = sq905c_mode;
 234         cam->nmodes = 2;
 235         if (gspca_dev->usb_buf[15] == 0)
 236                 cam->nmodes = 1;
 237         /* We don't use the buffer gspca allocates so make it small. */
 238         cam->bulk_size = 32;
 239         cam->bulk = 1;
 240         INIT_WORK(&dev->work_struct, sq905c_dostream);
 241         return 0;
 242 }
 243
 244 /* called on streamoff with alt==0 and on disconnect */
 245 /* the usb_lock is held at entry - restore on exit */
 246 static void sd_stop0(struct gspca_dev *gspca_dev)
 247 {
 248         struct sd *dev = (struct sd *) gspca_dev;
 249
 250         /* wait for the work queue to terminate */
 251         mutex_unlock(&gspca_dev->usb_lock);
 252         /* This waits for sq905c_dostream to finish */
 253         destroy_workqueue(dev->work_thread);
 254         dev->work_thread = NULL;
 255         mutex_lock(&gspca_dev->usb_lock);
 256 }
 257
 258 /* this function is called at probe and resume time */
 259 static int sd_init(struct gspca_dev *gspca_dev)
 260 {
 261         int ret;
 262
 263         /* connect to the camera and reset it. */
 264         ret = sq905c_command(gspca_dev, SQ905C_CLEAR, 0);
 265         return ret;
 266 }
 267
 268 /* Set up for getting frames. */
 269 static int sd_start(struct gspca_dev *gspca_dev)
 270 {
 271         struct sd *dev = (struct sd *) gspca_dev;
 272         int ret;
 273
 274         dev->cap_mode = gspca_dev->cam.cam_mode;
 275         /* "Open the shutter" and set size, to start capture */
 276         switch (gspca_dev->width) {
 277         case 640:
 278                 PDEBUG(D_STREAM, "Start streaming at high resolution");
 279                 dev->cap_mode++;
 280                 ret = sq905c_command(gspca_dev, SQ905C_CAPTURE_HI,
 281                                                 SQ905C_CAPTURE_INDEX);
 282                 break;
 283         default: /* 320 */
 284         PDEBUG(D_STREAM, "Start streaming at medium resolution");
 285                 ret = sq905c_command(gspca_dev, SQ905C_CAPTURE_MED,
 286                                                 SQ905C_CAPTURE_INDEX);
 287         }
 288
 289         if (ret < 0) {
 290                 PDEBUG(D_ERR, "Start streaming command failed");
 291                 return ret;
 292         }
 293         /* Start the workqueue function to do the streaming */
 294         dev->work_thread = create_singlethread_workqueue(MODULE_NAME);
 295         queue_work(dev->work_thread, &dev->work_struct);
 296
 297         return 0;
 298 }
 299
 300 /* Table of supported USB devices */
 301 static const struct usb_device_id device_table[] = {
 302         {USB_DEVICE(0x2770, 0x905c)},
 303         {USB_DEVICE(0x2770, 0x9050)},
 304         {USB_DEVICE(0x2770, 0x9051)},
 305         {USB_DEVICE(0x2770, 0x9052)},
 306         {USB_DEVICE(0x2770, 0x913d)},
 307         {}
 308 };
 309
 310 MODULE_DEVICE_TABLE(usb, device_table);
 311
 312 /* sub-driver description */
 313 static const struct sd_desc sd_desc = {
 314         .name   = MODULE_NAME,
 315         .config = sd_config,
 316         .init   = sd_init,
 317         .start  = sd_start,
 318         .stop0  = sd_stop0,
 319 };
 320
 321 /* -- device connect -- */
 322 static int sd_probe(struct usb_interface *intf,
 323                 const struct usb_device_id *id)
 324 {
 325         return gspca_dev_probe(intf, id,
 326                         &sd_desc,
 327                         sizeof(struct sd),
 328                         THIS_MODULE);
 329 }
 330
 331 static struct usb_driver sd_driver = {
 332         .name       = MODULE_NAME,
 333         .id_table   = device_table,
 334         .probe      = sd_probe,
 335         .disconnect = gspca_disconnect,
 336 #ifdef CONFIG_PM
 337         .suspend = gspca_suspend,
 338         .resume  = gspca_resume,
 339 #endif
 340 };
 341
 342 /* -- module insert / remove -- */
 343 static int __init sd_mod_init(void)
 344 {
 345         return usb_register(&sd_driver);
 346 }
 347
 348 static void __exit sd_mod_exit(void)
 349 {
 350         usb_deregister(&sd_driver);
 351 }
 352
 353 module_init(sd_mod_init);
 354 module_exit(sd_mod_exit);