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
  17 /*
  18  *
  19  * This driver uses work done in
  20  * libgphoto2/camlibs/digigr8, Copyright (C) Theodore Kilgore.
  21  *
  22  * This driver has also used as a base the sq905c driver
  23  * and may contain code fragments from it.
  24  */
  25
  26 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  27
  28 #define MODULE_NAME "sq905c"
  29
  30 #include <linux/workqueue.h>
  31 #include <linux/slab.h>
  32 #include "gspca.h"
  33
  34 MODULE_AUTHOR("Theodore Kilgore <kilgota@auburn.edu>");
  35 MODULE_DESCRIPTION("GSPCA/SQ905C USB Camera Driver");
  36 MODULE_LICENSE("GPL");
  37
  38 /* Default timeouts, in ms */
  39 #define SQ905C_CMD_TIMEOUT 500
  40 #define SQ905C_DATA_TIMEOUT 1000
  41
  42 /* Maximum transfer size to use. */
  43 #define SQ905C_MAX_TRANSFER 0x8000
  44
  45 #define FRAME_HEADER_LEN 0x50
  46
  47 /* Commands. These go in the "value" slot. */
  48 #define SQ905C_CLEAR   0xa0             /* clear everything */
  49 #define SQ905C_GET_ID  0x14f4           /* Read version number */
  50 #define SQ905C_CAPTURE_LOW 0xa040       /* Starts capture at 160x120 */
  51 #define SQ905C_CAPTURE_MED 0x1440       /* Starts capture at 320x240 */
  52 #define SQ905C_CAPTURE_HI 0x2840        /* Starts capture at 320x240 */
  53
  54 /* For capture, this must go in the "index" slot. */
  55 #define SQ905C_CAPTURE_INDEX 0x110f
  56
  57 /* Structure to hold all of our device specific stuff */
  58 struct sd {
  59         struct gspca_dev gspca_dev;     /* !! must be the first item */
  60         const struct v4l2_pix_format *cap_mode;
  61         /* Driver stuff */
  62         struct work_struct work_struct;
  63         struct workqueue_struct *work_thread;
  64 };
  65
  66 /*
  67  * Most of these cameras will do 640x480 and 320x240. 160x120 works
  68  * in theory but gives very poor output. Therefore, not supported.
  69  * The 0x2770:0x9050 cameras have max resolution of 320x240.
  70  */
  71 static struct v4l2_pix_format sq905c_mode[] = {
  72         { 320, 240, V4L2_PIX_FMT_SQ905C, V4L2_FIELD_NONE,
  73                 .bytesperline = 320,
  74                 .sizeimage = 320 * 240,
  75                 .colorspace = V4L2_COLORSPACE_SRGB,
  76                 .priv = 0},
  77         { 640, 480, V4L2_PIX_FMT_SQ905C, V4L2_FIELD_NONE,
  78                 .bytesperline = 640,
  79                 .sizeimage = 640 * 480,
  80                 .colorspace = V4L2_COLORSPACE_SRGB,
  81                 .priv = 0}
  82 };
  83
  84 /* Send a command to the camera. */
  85 static int sq905c_command(struct gspca_dev *gspca_dev, u16 command, u16 index)
  86 {
  87         int ret;
  88
  89         ret = usb_control_msg(gspca_dev->dev,
  90                               usb_sndctrlpipe(gspca_dev->dev, 0),
  91                               USB_REQ_SYNCH_FRAME,                /* request */
  92                               USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  93                               command, index, NULL, 0,
  94                               SQ905C_CMD_TIMEOUT);
  95         if (ret < 0) {
  96                 pr_err("%s: usb_control_msg failed (%d)\n", __func__, ret);
  97                 return ret;
  98         }
  99
 100         return 0;
 101 }
 102
 103 static int sq905c_read(struct gspca_dev *gspca_dev, u16 command, u16 index,
 104                        int size)
 105 {
 106         int ret;
 107
 108         ret = usb_control_msg(gspca_dev->dev,
 109                               usb_rcvctrlpipe(gspca_dev->dev, 0),
 110                               USB_REQ_SYNCH_FRAME,              /* request */
 111                               USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 112                               command, index, gspca_dev->usb_buf, size,
 113                               SQ905C_CMD_TIMEOUT);
 114         if (ret < 0) {
 115                 pr_err("%s: usb_control_msg failed (%d)\n", __func__, ret);
 116                 return ret;
 117         }
 118
 119         return 0;
 120 }
 121
 122 /*
 123  * This function is called as a workqueue function and runs whenever the camera
 124  * is streaming data. Because it is a workqueue function it is allowed to sleep
 125  * so we can use synchronous USB calls. To avoid possible collisions with other
 126  * threads attempting to use gspca_dev->usb_buf we take the usb_lock when
 127  * performing USB operations using it. In practice we don't really need this
 128  * as the camera doesn't provide any controls.
 129  */
 130 static void sq905c_dostream(struct work_struct *work)
 131 {
 132         struct sd *dev = container_of(work, struct sd, work_struct);
 133         struct gspca_dev *gspca_dev = &dev->gspca_dev;
 134         int bytes_left; /* bytes remaining in current frame. */
 135         int data_len;   /* size to use for the next read. */
 136         int act_len;
 137         int packet_type;
 138         int ret;
 139         u8 *buffer;
 140
 141         buffer = kmalloc(SQ905C_MAX_TRANSFER, GFP_KERNEL | GFP_DMA);
 142         if (!buffer) {
 143                 pr_err("Couldn't allocate USB buffer\n");
 144                 goto quit_stream;
 145         }
 146
 147         while (gspca_dev->present && gspca_dev->streaming) {
 148 #ifdef CONFIG_PM
 149                 if (gspca_dev->frozen)
 150                         break;
 151 #endif
 152                 /* Request the header, which tells the size to download */
 153                 ret = usb_bulk_msg(gspca_dev->dev,
 154                                 usb_rcvbulkpipe(gspca_dev->dev, 0x81),
 155                                 buffer, FRAME_HEADER_LEN, &act_len,
 156                                 SQ905C_DATA_TIMEOUT);
 157                 PDEBUG(D_STREAM,
 158                         "Got %d bytes out of %d for header",
 159                         act_len, FRAME_HEADER_LEN);
 160                 if (ret < 0 || act_len < FRAME_HEADER_LEN)
 161                         goto quit_stream;
 162                 /* size is read from 4 bytes starting 0x40, little endian */
 163                 bytes_left = buffer[0x40]|(buffer[0x41]<<8)|(buffer[0x42]<<16)
 164                                         |(buffer[0x43]<<24);
 165                 PDEBUG(D_STREAM, "bytes_left = 0x%x", bytes_left);
 166                 /* We keep the header. It has other information, too. */
 167                 packet_type = FIRST_PACKET;
 168                 gspca_frame_add(gspca_dev, packet_type,
 169                                 buffer, FRAME_HEADER_LEN);
 170                 while (bytes_left > 0 && gspca_dev->present) {
 171                         data_len = bytes_left > SQ905C_MAX_TRANSFER ?
 172                                 SQ905C_MAX_TRANSFER : bytes_left;
 173                         ret = usb_bulk_msg(gspca_dev->dev,
 174                                 usb_rcvbulkpipe(gspca_dev->dev, 0x81),
 175                                 buffer, data_len, &act_len,
 176                                 SQ905C_DATA_TIMEOUT);
 177                         if (ret < 0 || act_len < data_len)
 178                                 goto quit_stream;
 179                         PDEBUG(D_STREAM,
 180                                 "Got %d bytes out of %d for frame",
 181                                 data_len, bytes_left);
 182                         bytes_left -= data_len;
 183                         if (bytes_left == 0)
 184                                 packet_type = LAST_PACKET;
 185                         else
 186                                 packet_type = INTER_PACKET;
 187                         gspca_frame_add(gspca_dev, packet_type,
 188                                         buffer, data_len);
 189                 }
 190         }
 191 quit_stream:
 192         if (gspca_dev->present) {
 193                 mutex_lock(&gspca_dev->usb_lock);
 194                 sq905c_command(gspca_dev, SQ905C_CLEAR, 0);
 195                 mutex_unlock(&gspca_dev->usb_lock);
 196         }
 197         kfree(buffer);
 198 }
 199
 200 /* This function is called at probe time just before sd_init */
 201 static int sd_config(struct gspca_dev *gspca_dev,
 202                 const struct usb_device_id *id)
 203 {
 204         struct cam *cam = &gspca_dev->cam;
 205         struct sd *dev = (struct sd *) gspca_dev;
 206         int ret;
 207
 208         PDEBUG(D_PROBE,
 209                "SQ9050 camera detected (vid/pid 0x%04X:0x%04X)",
 210                id->idVendor, id->idProduct);
 211
 212         ret = sq905c_command(gspca_dev, SQ905C_GET_ID, 0);
 213         if (ret < 0) {
 214                 PERR("Get version command failed");
 215                 return ret;
 216         }
 217
 218         ret = sq905c_read(gspca_dev, 0xf5, 0, 20);
 219         if (ret < 0) {
 220                 PERR("Reading version command failed");
 221                 return ret;
 222         }
 223         /* Note we leave out the usb id and the manufacturing date */
 224         PDEBUG(D_PROBE,
 225                "SQ9050 ID string: %02x - %*ph",
 226                 gspca_dev->usb_buf[3], 6, gspca_dev->usb_buf + 14);
 227
 228         cam->cam_mode = sq905c_mode;
 229         cam->nmodes = 2;
 230         if (gspca_dev->usb_buf[15] == 0)
 231                 cam->nmodes = 1;
 232         /* We don't use the buffer gspca allocates so make it small. */
 233         cam->bulk_size = 32;
 234         cam->bulk = 1;
 235         INIT_WORK(&dev->work_struct, sq905c_dostream);
 236         return 0;
 237 }
 238
 239 /* called on streamoff with alt==0 and on disconnect */
 240 /* the usb_lock is held at entry - restore on exit */
 241 static void sd_stop0(struct gspca_dev *gspca_dev)
 242 {
 243         struct sd *dev = (struct sd *) gspca_dev;
 244
 245         /* wait for the work queue to terminate */
 246         mutex_unlock(&gspca_dev->usb_lock);
 247         /* This waits for sq905c_dostream to finish */
 248         destroy_workqueue(dev->work_thread);
 249         dev->work_thread = NULL;
 250         mutex_lock(&gspca_dev->usb_lock);
 251 }
 252
 253 /* this function is called at probe and resume time */
 254 static int sd_init(struct gspca_dev *gspca_dev)
 255 {
 256         /* connect to the camera and reset it. */
 257         return sq905c_command(gspca_dev, SQ905C_CLEAR, 0);
 258 }
 259
 260 /* Set up for getting frames. */
 261 static int sd_start(struct gspca_dev *gspca_dev)
 262 {
 263         struct sd *dev = (struct sd *) gspca_dev;
 264         int ret;
 265
 266         dev->cap_mode = gspca_dev->cam.cam_mode;
 267         /* "Open the shutter" and set size, to start capture */
 268         switch (gspca_dev->pixfmt.width) {
 269         case 640:
 270                 PDEBUG(D_STREAM, "Start streaming at high resolution");
 271                 dev->cap_mode++;
 272                 ret = sq905c_command(gspca_dev, SQ905C_CAPTURE_HI,
 273                                                 SQ905C_CAPTURE_INDEX);
 274                 break;
 275         default: /* 320 */
 276         PDEBUG(D_STREAM, "Start streaming at medium resolution");
 277                 ret = sq905c_command(gspca_dev, SQ905C_CAPTURE_MED,
 278                                                 SQ905C_CAPTURE_INDEX);
 279         }
 280
 281         if (ret < 0) {
 282                 PERR("Start streaming command failed");
 283                 return ret;
 284         }
 285         /* Start the workqueue function to do the streaming */
 286         dev->work_thread = create_singlethread_workqueue(MODULE_NAME);
 287         queue_work(dev->work_thread, &dev->work_struct);
 288
 289         return 0;
 290 }
 291
 292 /* Table of supported USB devices */
 293 static const struct usb_device_id device_table[] = {
 294         {USB_DEVICE(0x2770, 0x905c)},
 295         {USB_DEVICE(0x2770, 0x9050)},
 296         {USB_DEVICE(0x2770, 0x9051)},
 297         {USB_DEVICE(0x2770, 0x9052)},
 298         {USB_DEVICE(0x2770, 0x913d)},
 299         {}
 300 };
 301
 302 MODULE_DEVICE_TABLE(usb, device_table);
 303
 304 /* sub-driver description */
 305 static const struct sd_desc sd_desc = {
 306         .name   = MODULE_NAME,
 307         .config = sd_config,
 308         .init   = sd_init,
 309         .start  = sd_start,
 310         .stop0  = sd_stop0,
 311 };
 312
 313 /* -- device connect -- */
 314 static int sd_probe(struct usb_interface *intf,
 315                 const struct usb_device_id *id)
 316 {
 317         return gspca_dev_probe(intf, id,
 318                         &sd_desc,
 319                         sizeof(struct sd),
 320                         THIS_MODULE);
 321 }
 322
 323 static struct usb_driver sd_driver = {
 324         .name       = MODULE_NAME,
 325         .id_table   = device_table,
 326         .probe      = sd_probe,
 327         .disconnect = gspca_disconnect,
 328 #ifdef CONFIG_PM
 329         .suspend = gspca_suspend,
 330         .resume  = gspca_resume,
 331         .reset_resume = gspca_resume,
 332 #endif
 333 };
 334
 335 module_usb_driver(sd_driver);