drivers/media/usb/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 /*
 127  * This function is called as a workqueue function and runs whenever the camera
 128  * is streaming data. Because it is a workqueue function it is allowed to sleep
 129  * so we can use synchronous USB calls. To avoid possible collisions with other
 130  * threads attempting to use gspca_dev->usb_buf we take the usb_lock when
 131  * performing USB operations using it. In practice we don't really need this
 132  * as the camera doesn't provide any controls.
 133  */
 134 static void sq905c_dostream(struct work_struct *work)
 135 {
 136         struct sd *dev = container_of(work, struct sd, work_struct);
 137         struct gspca_dev *gspca_dev = &dev->gspca_dev;
 138         int bytes_left; /* bytes remaining in current frame. */
 139         int data_len;   /* size to use for the next read. */
 140         int act_len;
 141         int packet_type;
 142         int ret;
 143         u8 *buffer;
 144
 145         buffer = kmalloc(SQ905C_MAX_TRANSFER, GFP_KERNEL | GFP_DMA);
 146         if (!buffer) {
 147                 pr_err("Couldn't allocate USB buffer\n");
 148                 goto quit_stream;
 149         }
 150
 151         while (gspca_dev->present && gspca_dev->streaming) {
 152 #ifdef CONFIG_PM
 153                 if (gspca_dev->frozen)
 154                         break;
 155 #endif
 156                 /* Request the header, which tells the size to download */
 157                 ret = usb_bulk_msg(gspca_dev->dev,
 158                                 usb_rcvbulkpipe(gspca_dev->dev, 0x81),
 159                                 buffer, FRAME_HEADER_LEN, &act_len,
 160                                 SQ905C_DATA_TIMEOUT);
 161                 PDEBUG(D_STREAM,
 162                         "Got %d bytes out of %d for header",
 163                         act_len, FRAME_HEADER_LEN);
 164                 if (ret < 0 || act_len < FRAME_HEADER_LEN)
 165                         goto quit_stream;
 166                 /* size is read from 4 bytes starting 0x40, little endian */
 167                 bytes_left = buffer[0x40]|(buffer[0x41]<<8)|(buffer[0x42]<<16)
 168                                         |(buffer[0x43]<<24);
 169                 PDEBUG(D_STREAM, "bytes_left = 0x%x", bytes_left);
 170                 /* We keep the header. It has other information, too. */
 171                 packet_type = FIRST_PACKET;
 172                 gspca_frame_add(gspca_dev, packet_type,
 173                                 buffer, FRAME_HEADER_LEN);
 174                 while (bytes_left > 0 && gspca_dev->present) {
 175                         data_len = bytes_left > SQ905C_MAX_TRANSFER ?
 176                                 SQ905C_MAX_TRANSFER : bytes_left;
 177                         ret = usb_bulk_msg(gspca_dev->dev,
 178                                 usb_rcvbulkpipe(gspca_dev->dev, 0x81),
 179                                 buffer, data_len, &act_len,
 180                                 SQ905C_DATA_TIMEOUT);
 181                         if (ret < 0 || act_len < data_len)
 182                                 goto quit_stream;
 183                         PDEBUG(D_STREAM,
 184                                 "Got %d bytes out of %d for frame",
 185                                 data_len, bytes_left);
 186                         bytes_left -= data_len;
 187                         if (bytes_left == 0)
 188                                 packet_type = LAST_PACKET;
 189                         else
 190                                 packet_type = INTER_PACKET;
 191                         gspca_frame_add(gspca_dev, packet_type,
 192                                         buffer, data_len);
 193                 }
 194         }
 195 quit_stream:
 196         if (gspca_dev->present) {
 197                 mutex_lock(&gspca_dev->usb_lock);
 198                 sq905c_command(gspca_dev, SQ905C_CLEAR, 0);
 199                 mutex_unlock(&gspca_dev->usb_lock);
 200         }
 201         kfree(buffer);
 202 }
 203
 204 /* This function is called at probe time just before sd_init */
 205 static int sd_config(struct gspca_dev *gspca_dev,
 206                 const struct usb_device_id *id)
 207 {
 208         struct cam *cam = &gspca_dev->cam;
 209         struct sd *dev = (struct sd *) gspca_dev;
 210         int ret;
 211
 212         PDEBUG(D_PROBE,
 213                "SQ9050 camera detected (vid/pid 0x%04X:0x%04X)",
 214                id->idVendor, id->idProduct);
 215
 216         ret = sq905c_command(gspca_dev, SQ905C_GET_ID, 0);
 217         if (ret < 0) {
 218                 PERR("Get version command failed");
 219                 return ret;
 220         }
 221
 222         ret = sq905c_read(gspca_dev, 0xf5, 0, 20);
 223         if (ret < 0) {
 224                 PERR("Reading version command failed");
 225                 return ret;
 226         }
 227         /* Note we leave out the usb id and the manufacturing date */
 228         PDEBUG(D_PROBE,
 229                "SQ9050 ID string: %02x - %*ph",
 230                 gspca_dev->usb_buf[3], 6, gspca_dev->usb_buf + 14);
 231
 232         cam->cam_mode = sq905c_mode;
 233         cam->nmodes = 2;
 234         if (gspca_dev->usb_buf[15] == 0)
 235                 cam->nmodes = 1;
 236         /* We don't use the buffer gspca allocates so make it small. */
 237         cam->bulk_size = 32;
 238         cam->bulk = 1;
 239         INIT_WORK(&dev->work_struct, sq905c_dostream);
 240         return 0;
 241 }
 242
 243 /* called on streamoff with alt==0 and on disconnect */
 244 /* the usb_lock is held at entry - restore on exit */
 245 static void sd_stop0(struct gspca_dev *gspca_dev)
 246 {
 247         struct sd *dev = (struct sd *) gspca_dev;
 248
 249         /* wait for the work queue to terminate */
 250         mutex_unlock(&gspca_dev->usb_lock);
 251         /* This waits for sq905c_dostream to finish */
 252         destroy_workqueue(dev->work_thread);
 253         dev->work_thread = NULL;
 254         mutex_lock(&gspca_dev->usb_lock);
 255 }
 256
 257 /* this function is called at probe and resume time */
 258 static int sd_init(struct gspca_dev *gspca_dev)
 259 {
 260         /* connect to the camera and reset it. */
 261         return sq905c_command(gspca_dev, SQ905C_CLEAR, 0);
 262 }
 263
 264 /* Set up for getting frames. */
 265 static int sd_start(struct gspca_dev *gspca_dev)
 266 {
 267         struct sd *dev = (struct sd *) gspca_dev;
 268         int ret;
 269
 270         dev->cap_mode = gspca_dev->cam.cam_mode;
 271         /* "Open the shutter" and set size, to start capture */
 272         switch (gspca_dev->pixfmt.width) {
 273         case 640:
 274                 PDEBUG(D_STREAM, "Start streaming at high resolution");
 275                 dev->cap_mode++;
 276                 ret = sq905c_command(gspca_dev, SQ905C_CAPTURE_HI,
 277                                                 SQ905C_CAPTURE_INDEX);
 278                 break;
 279         default: /* 320 */
 280         PDEBUG(D_STREAM, "Start streaming at medium resolution");
 281                 ret = sq905c_command(gspca_dev, SQ905C_CAPTURE_MED,
 282                                                 SQ905C_CAPTURE_INDEX);
 283         }
 284
 285         if (ret < 0) {
 286                 PERR("Start streaming command failed");
 287                 return ret;
 288         }
 289         /* Start the workqueue function to do the streaming */
 290         dev->work_thread = create_singlethread_workqueue(MODULE_NAME);
 291         queue_work(dev->work_thread, &dev->work_struct);
 292
 293         return 0;
 294 }
 295
 296 /* Table of supported USB devices */
 297 static const struct usb_device_id device_table[] = {
 298         {USB_DEVICE(0x2770, 0x905c)},
 299         {USB_DEVICE(0x2770, 0x9050)},
 300         {USB_DEVICE(0x2770, 0x9051)},
 301         {USB_DEVICE(0x2770, 0x9052)},
 302         {USB_DEVICE(0x2770, 0x913d)},
 303         {}
 304 };
 305
 306 MODULE_DEVICE_TABLE(usb, device_table);
 307
 308 /* sub-driver description */
 309 static const struct sd_desc sd_desc = {
 310         .name   = MODULE_NAME,
 311         .config = sd_config,
 312         .init   = sd_init,
 313         .start  = sd_start,
 314         .stop0  = sd_stop0,
 315 };
 316
 317 /* -- device connect -- */
 318 static int sd_probe(struct usb_interface *intf,
 319                 const struct usb_device_id *id)
 320 {
 321         return gspca_dev_probe(intf, id,
 322                         &sd_desc,
 323                         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);