drivers/media/usb/gspca/vicam.c

   1 /*
   2  * gspca ViCam subdriver
   3  *
   4  * Copyright (C) 2011 Hans de Goede <hdegoede@redhat.com>
   5  *
   6  * Based on the usbvideo vicam driver, which is:
   7  *
   8  * Copyright (c) 2002 Joe Burks (jburks@wavicle.org),
   9  *                    Chris Cheney (chris.cheney@gmail.com),
  10  *                    Pavel Machek (pavel@ucw.cz),
  11  *                    John Tyner (jtyner@cs.ucr.edu),
  12  *                    Monroe Williams (monroe@pobox.com)
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or
  17  * any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program; if not, write to the Free Software
  26  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  27  */
  28
  29 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  30
  31 #define MODULE_NAME "vicam"
  32 #define HEADER_SIZE 64
  33
  34 #include <linux/workqueue.h>
  35 #include <linux/slab.h>
  36 #include <linux/firmware.h>
  37 #include <linux/ihex.h>
  38 #include "gspca.h"
  39
  40 #define VICAM_FIRMWARE "vicam/firmware.fw"
  41
  42 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
  43 MODULE_DESCRIPTION("GSPCA ViCam USB Camera Driver");
  44 MODULE_LICENSE("GPL");
  45 MODULE_FIRMWARE(VICAM_FIRMWARE);
  46
  47 struct sd {
  48         struct gspca_dev gspca_dev;     /* !! must be the first item */
  49         struct work_struct work_struct;
  50 };
  51
  52 /* The vicam sensor has a resolution of 512 x 244, with I believe square
  53    pixels, but this is forced to a 4:3 ratio by optics. So it has
  54    non square pixels :( */
  55 static struct v4l2_pix_format vicam_mode[] = {
  56         { 256, 122, V4L2_PIX_FMT_SGRBG8, V4L2_FIELD_NONE,
  57                 .bytesperline = 256,
  58                 .sizeimage = 256 * 122,
  59                 .colorspace = V4L2_COLORSPACE_SRGB,},
  60         /* 2 modes with somewhat more square pixels */
  61         { 256, 200, V4L2_PIX_FMT_SGRBG8, V4L2_FIELD_NONE,
  62                 .bytesperline = 256,
  63                 .sizeimage = 256 * 200,
  64                 .colorspace = V4L2_COLORSPACE_SRGB,},
  65         { 256, 240, V4L2_PIX_FMT_SGRBG8, V4L2_FIELD_NONE,
  66                 .bytesperline = 256,
  67                 .sizeimage = 256 * 240,
  68                 .colorspace = V4L2_COLORSPACE_SRGB,},
  69 #if 0   /* This mode has extremely non square pixels, testing use only */
  70         { 512, 122, V4L2_PIX_FMT_SGRBG8, V4L2_FIELD_NONE,
  71                 .bytesperline = 512,
  72                 .sizeimage = 512 * 122,
  73                 .colorspace = V4L2_COLORSPACE_SRGB,},
  74 #endif
  75         { 512, 244, V4L2_PIX_FMT_SGRBG8, V4L2_FIELD_NONE,
  76                 .bytesperline = 512,
  77                 .sizeimage = 512 * 244,
  78                 .colorspace = V4L2_COLORSPACE_SRGB,},
  79 };
  80
  81 static int vicam_control_msg(struct gspca_dev *gspca_dev, u8 request,
  82         u16 value, u16 index, u8 *data, u16 len)
  83 {
  84         int ret;
  85
  86         ret = usb_control_msg(gspca_dev->dev,
  87                               usb_sndctrlpipe(gspca_dev->dev, 0),
  88                               request,
  89                               USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  90                               value, index, data, len, 1000);
  91         if (ret < 0)
  92                 pr_err("control msg req %02X error %d\n", request, ret);
  93
  94         return ret;
  95 }
  96
  97 static int vicam_set_camera_power(struct gspca_dev *gspca_dev, int state)
  98 {
  99         int ret;
 100
 101         ret = vicam_control_msg(gspca_dev, 0x50, state, 0, NULL, 0);
 102         if (ret < 0)
 103                 return ret;
 104
 105         if (state)
 106                 ret = vicam_control_msg(gspca_dev, 0x55, 1, 0, NULL, 0);
 107
 108         return ret;
 109 }
 110
 111 /*
 112  *  request and read a block of data
 113  */
 114 static int vicam_read_frame(struct gspca_dev *gspca_dev, u8 *data, int size)
 115 {
 116         int ret, unscaled_height, act_len = 0;
 117         u8 *req_data = gspca_dev->usb_buf;
 118         s32 expo = v4l2_ctrl_g_ctrl(gspca_dev->exposure);
 119         s32 gain = v4l2_ctrl_g_ctrl(gspca_dev->gain);
 120
 121         memset(req_data, 0, 16);
 122         req_data[0] = gain;
 123         if (gspca_dev->pixfmt.width == 256)
 124                 req_data[1] |= 0x01; /* low nibble x-scale */
 125         if (gspca_dev->pixfmt.height <= 122) {
 126                 req_data[1] |= 0x10; /* high nibble y-scale */
 127                 unscaled_height = gspca_dev->pixfmt.height * 2;
 128         } else
 129                 unscaled_height = gspca_dev->pixfmt.height;
 130         req_data[2] = 0x90; /* unknown, does not seem to do anything */
 131         if (unscaled_height <= 200)
 132                 req_data[3] = 0x06; /* vend? */
 133         else if (unscaled_height <= 242) /* Yes 242 not 240 */
 134                 req_data[3] = 0x07; /* vend? */
 135         else /* Up to 244 lines with req_data[3] == 0x08 */
 136                 req_data[3] = 0x08; /* vend? */
 137
 138         if (expo < 256) {
 139                 /* Frame rate maxed out, use partial frame expo time */
 140                 req_data[4] = 255 - expo;
 141                 req_data[5] = 0x00;
 142                 req_data[6] = 0x00;
 143                 req_data[7] = 0x01;
 144         } else {
 145                 /* Modify frame rate */
 146                 req_data[4] = 0x00;
 147                 req_data[5] = 0x00;
 148                 req_data[6] = expo & 0xFF;
 149                 req_data[7] = expo >> 8;
 150         }
 151         req_data[8] = ((244 - unscaled_height) / 2) & ~0x01; /* vstart */
 152         /* bytes 9-15 do not seem to affect exposure or image quality */
 153
 154         mutex_lock(&gspca_dev->usb_lock);
 155         ret = vicam_control_msg(gspca_dev, 0x51, 0x80, 0, req_data, 16);
 156         mutex_unlock(&gspca_dev->usb_lock);
 157         if (ret < 0)
 158                 return ret;
 159
 160         ret = usb_bulk_msg(gspca_dev->dev,
 161                            usb_rcvbulkpipe(gspca_dev->dev, 0x81),
 162                            data, size, &act_len, 10000);
 163         /* successful, it returns 0, otherwise  negative */
 164         if (ret < 0 || act_len != size) {
 165                 pr_err("bulk read fail (%d) len %d/%d\n",
 166                        ret, act_len, size);
 167                 return -EIO;
 168         }
 169         return 0;
 170 }
 171
 172 /*
 173  * This function is called as a workqueue function and runs whenever the camera
 174  * is streaming data. Because it is a workqueue function it is allowed to sleep
 175  * so we can use synchronous USB calls. To avoid possible collisions with other
 176  * threads attempting to use gspca_dev->usb_buf we take the usb_lock when
 177  * performing USB operations using it. In practice we don't really need this
 178  * as the cameras controls are only written from the workqueue.
 179  */
 180 static void vicam_dostream(struct work_struct *work)
 181 {
 182         struct sd *sd = container_of(work, struct sd, work_struct);
 183         struct gspca_dev *gspca_dev = &sd->gspca_dev;
 184         int ret, frame_sz;
 185         u8 *buffer;
 186
 187         frame_sz = gspca_dev->cam.cam_mode[gspca_dev->curr_mode].sizeimage +
 188                    HEADER_SIZE;
 189         buffer = kmalloc(frame_sz, GFP_KERNEL | GFP_DMA);
 190         if (!buffer) {
 191                 pr_err("Couldn't allocate USB buffer\n");
 192                 goto exit;
 193         }
 194
 195         while (gspca_dev->present && gspca_dev->streaming) {
 196 #ifdef CONFIG_PM
 197                 if (gspca_dev->frozen)
 198                         break;
 199 #endif
 200                 ret = vicam_read_frame(gspca_dev, buffer, frame_sz);
 201                 if (ret < 0)
 202                         break;
 203
 204                 /* Note the frame header contents seem to be completely
 205                    constant, they do not change with either image, or
 206                    settings. So we simply discard it. The frames have
 207                    a very similar 64 byte footer, which we don't even
 208                    bother reading from the cam */
 209                 gspca_frame_add(gspca_dev, FIRST_PACKET,
 210                                 buffer + HEADER_SIZE,
 211                                 frame_sz - HEADER_SIZE);
 212                 gspca_frame_add(gspca_dev, LAST_PACKET, NULL, 0);
 213         }
 214 exit:
 215         kfree(buffer);
 216 }
 217
 218 /* This function is called at probe time just before sd_init */
 219 static int sd_config(struct gspca_dev *gspca_dev,
 220                 const struct usb_device_id *id)
 221 {
 222         struct cam *cam = &gspca_dev->cam;
 223         struct sd *sd = (struct sd *)gspca_dev;
 224
 225         /* We don't use the buffer gspca allocates so make it small. */
 226         cam->bulk = 1;
 227         cam->bulk_size = 64;
 228         cam->cam_mode = vicam_mode;
 229         cam->nmodes = ARRAY_SIZE(vicam_mode);
 230
 231         INIT_WORK(&sd->work_struct, vicam_dostream);
 232
 233         return 0;
 234 }
 235
 236 /* this function is called at probe and resume time */
 237 static int sd_init(struct gspca_dev *gspca_dev)
 238 {
 239         int ret;
 240         const struct ihex_binrec *rec;
 241         const struct firmware *uninitialized_var(fw);
 242         u8 *firmware_buf;
 243
 244         ret = request_ihex_firmware(&fw, VICAM_FIRMWARE,
 245                                     &gspca_dev->dev->dev);
 246         if (ret) {
 247                 pr_err("Failed to load \"vicam/firmware.fw\": %d\n", ret);
 248                 return ret;
 249         }
 250
 251         firmware_buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
 252         if (!firmware_buf) {
 253                 ret = -ENOMEM;
 254                 goto exit;
 255         }
 256         for (rec = (void *)fw->data; rec; rec = ihex_next_binrec(rec)) {
 257                 memcpy(firmware_buf, rec->data, be16_to_cpu(rec->len));
 258                 ret = vicam_control_msg(gspca_dev, 0xff, 0, 0, firmware_buf,
 259                                         be16_to_cpu(rec->len));
 260                 if (ret < 0)
 261                         break;
 262         }
 263
 264         kfree(firmware_buf);
 265 exit:
 266         release_firmware(fw);
 267         return ret;
 268 }
 269
 270 /* Set up for getting frames. */
 271 static int sd_start(struct gspca_dev *gspca_dev)
 272 {
 273         struct sd *sd = (struct sd *)gspca_dev;
 274         int ret;
 275
 276         ret = vicam_set_camera_power(gspca_dev, 1);
 277         if (ret < 0)
 278                 return ret;
 279
 280         schedule_work(&sd->work_struct);
 281
 282         return 0;
 283 }
 284
 285 /* called on streamoff with alt==0 and on disconnect */
 286 /* the usb_lock is held at entry - restore on exit */
 287 static void sd_stop0(struct gspca_dev *gspca_dev)
 288 {
 289         struct sd *dev = (struct sd *)gspca_dev;
 290
 291         /* wait for the work queue to terminate */
 292         mutex_unlock(&gspca_dev->usb_lock);
 293         /* This waits for vicam_dostream to finish */
 294         flush_work(&dev->work_struct);
 295         mutex_lock(&gspca_dev->usb_lock);
 296
 297         if (gspca_dev->present)
 298                 vicam_set_camera_power(gspca_dev, 0);
 299 }
 300
 301 static int sd_init_controls(struct gspca_dev *gspca_dev)
 302 {
 303         struct v4l2_ctrl_handler *hdl = &gspca_dev->ctrl_handler;
 304
 305         gspca_dev->vdev.ctrl_handler = hdl;
 306         v4l2_ctrl_handler_init(hdl, 2);
 307         gspca_dev->exposure = v4l2_ctrl_new_std(hdl, NULL,
 308                         V4L2_CID_EXPOSURE, 0, 2047, 1, 256);
 309         gspca_dev->gain = v4l2_ctrl_new_std(hdl, NULL,
 310                         V4L2_CID_GAIN, 0, 255, 1, 200);
 311
 312         if (hdl->error) {
 313                 pr_err("Could not initialize controls\n");
 314                 return hdl->error;
 315         }
 316         return 0;
 317 }
 318
 319 /* Table of supported USB devices */
 320 static const struct usb_device_id device_table[] = {
 321         {USB_DEVICE(0x04c1, 0x009d)},
 322         {USB_DEVICE(0x0602, 0x1001)},
 323         {}
 324 };
 325
 326 MODULE_DEVICE_TABLE(usb, device_table);
 327
 328 /* sub-driver description */
 329 static const struct sd_desc sd_desc = {
 330         .name   = MODULE_NAME,
 331         .config = sd_config,
 332         .init   = sd_init,
 333         .init_controls = sd_init_controls,
 334         .start  = sd_start,
 335         .stop0  = sd_stop0,
 336 };
 337
 338 /* -- device connect -- */
 339 static int sd_probe(struct usb_interface *intf,
 340                 const struct usb_device_id *id)
 341 {
 342         return gspca_dev_probe(intf, id,
 343                         &sd_desc,
 344                         sizeof(struct sd),
 345                         THIS_MODULE);
 346 }
 347
 348 static struct usb_driver sd_driver = {
 349         .name       = MODULE_NAME,
 350         .id_table   = device_table,
 351         .probe      = sd_probe,
 352         .disconnect = gspca_disconnect,
 353 #ifdef CONFIG_PM
 354         .suspend = gspca_suspend,
 355         .resume  = gspca_resume,
 356         .reset_resume = gspca_resume,
 357 #endif
 358 };
 359
 360 module_usb_driver(sd_driver);