drivers/media/usb/gspca/vicam.c

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This source file includes following definitions.
vicam_control_msg
vicam_set_camera_power
vicam_read_frame
vicam_dostream
sd_config
sd_init
sd_start
sd_stop0
sd_init_controls
sd_probe
   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * gspca ViCam subdriver
   4  *
   5  * Copyright (C) 2011 Hans de Goede <hdegoede@redhat.com>
   6  *
   7  * Based on the usbvideo vicam driver, which is:
   8  *
   9  * Copyright (c) 2002 Joe Burks (jburks@wavicle.org),
  10  *                    Chris Cheney (chris.cheney@gmail.com),
  11  *                    Pavel Machek (pavel@ucw.cz),
  12  *                    John Tyner (jtyner@cs.ucr.edu),
  13  *                    Monroe Williams (monroe@pobox.com)
  14  */
  15 
  16 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  17 
  18 #define MODULE_NAME "vicam"
  19 #define HEADER_SIZE 64
  20 
  21 #include <linux/workqueue.h>
  22 #include <linux/slab.h>
  23 #include <linux/firmware.h>
  24 #include <linux/ihex.h>
  25 #include "gspca.h"
  26 
  27 #define VICAM_FIRMWARE "vicam/firmware.fw"
  28 
  29 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
  30 MODULE_DESCRIPTION("GSPCA ViCam USB Camera Driver");
  31 MODULE_LICENSE("GPL");
  32 MODULE_FIRMWARE(VICAM_FIRMWARE);
  33 
  34 struct sd {
  35         struct gspca_dev gspca_dev;     /* !! must be the first item */
  36         struct work_struct work_struct;
  37 };
  38 
  39 /* The vicam sensor has a resolution of 512 x 244, with I believe square
  40    pixels, but this is forced to a 4:3 ratio by optics. So it has
  41    non square pixels :( */
  42 static struct v4l2_pix_format vicam_mode[] = {
  43         { 256, 122, V4L2_PIX_FMT_SGRBG8, V4L2_FIELD_NONE,
  44                 .bytesperline = 256,
  45                 .sizeimage = 256 * 122,
  46                 .colorspace = V4L2_COLORSPACE_SRGB,},
  47         /* 2 modes with somewhat more square pixels */
  48         { 256, 200, V4L2_PIX_FMT_SGRBG8, V4L2_FIELD_NONE,
  49                 .bytesperline = 256,
  50                 .sizeimage = 256 * 200,
  51                 .colorspace = V4L2_COLORSPACE_SRGB,},
  52         { 256, 240, V4L2_PIX_FMT_SGRBG8, V4L2_FIELD_NONE,
  53                 .bytesperline = 256,
  54                 .sizeimage = 256 * 240,
  55                 .colorspace = V4L2_COLORSPACE_SRGB,},
  56 #if 0   /* This mode has extremely non square pixels, testing use only */
  57         { 512, 122, V4L2_PIX_FMT_SGRBG8, V4L2_FIELD_NONE,
  58                 .bytesperline = 512,
  59                 .sizeimage = 512 * 122,
  60                 .colorspace = V4L2_COLORSPACE_SRGB,},
  61 #endif
  62         { 512, 244, V4L2_PIX_FMT_SGRBG8, V4L2_FIELD_NONE,
  63                 .bytesperline = 512,
  64                 .sizeimage = 512 * 244,
  65                 .colorspace = V4L2_COLORSPACE_SRGB,},
  66 };
  67 
  68 static int vicam_control_msg(struct gspca_dev *gspca_dev, u8 request,
  69         u16 value, u16 index, u8 *data, u16 len)
  70 {
  71         int ret;
  72 
  73         ret = usb_control_msg(gspca_dev->dev,
  74                               usb_sndctrlpipe(gspca_dev->dev, 0),
  75                               request,
  76                               USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  77                               value, index, data, len, 1000);
  78         if (ret < 0)
  79                 pr_err("control msg req %02X error %d\n", request, ret);
  80 
  81         return ret;
  82 }
  83 
  84 static int vicam_set_camera_power(struct gspca_dev *gspca_dev, int state)
  85 {
  86         int ret;
  87 
  88         ret = vicam_control_msg(gspca_dev, 0x50, state, 0, NULL, 0);
  89         if (ret < 0)
  90                 return ret;
  91 
  92         if (state)
  93                 ret = vicam_control_msg(gspca_dev, 0x55, 1, 0, NULL, 0);
  94 
  95         return ret;
  96 }
  97 
  98 /*
  99  *  request and read a block of data
 100  */
 101 static int vicam_read_frame(struct gspca_dev *gspca_dev, u8 *data, int size)
 102 {
 103         int ret, unscaled_height, act_len = 0;
 104         u8 *req_data = gspca_dev->usb_buf;
 105         s32 expo = v4l2_ctrl_g_ctrl(gspca_dev->exposure);
 106         s32 gain = v4l2_ctrl_g_ctrl(gspca_dev->gain);
 107 
 108         memset(req_data, 0, 16);
 109         req_data[0] = gain;
 110         if (gspca_dev->pixfmt.width == 256)
 111                 req_data[1] |= 0x01; /* low nibble x-scale */
 112         if (gspca_dev->pixfmt.height <= 122) {
 113                 req_data[1] |= 0x10; /* high nibble y-scale */
 114                 unscaled_height = gspca_dev->pixfmt.height * 2;
 115         } else
 116                 unscaled_height = gspca_dev->pixfmt.height;
 117         req_data[2] = 0x90; /* unknown, does not seem to do anything */
 118         if (unscaled_height <= 200)
 119                 req_data[3] = 0x06; /* vend? */
 120         else if (unscaled_height <= 242) /* Yes 242 not 240 */
 121                 req_data[3] = 0x07; /* vend? */
 122         else /* Up to 244 lines with req_data[3] == 0x08 */
 123                 req_data[3] = 0x08; /* vend? */
 124 
 125         if (expo < 256) {
 126                 /* Frame rate maxed out, use partial frame expo time */
 127                 req_data[4] = 255 - expo;
 128                 req_data[5] = 0x00;
 129                 req_data[6] = 0x00;
 130                 req_data[7] = 0x01;
 131         } else {
 132                 /* Modify frame rate */
 133                 req_data[4] = 0x00;
 134                 req_data[5] = 0x00;
 135                 req_data[6] = expo & 0xFF;
 136                 req_data[7] = expo >> 8;
 137         }
 138         req_data[8] = ((244 - unscaled_height) / 2) & ~0x01; /* vstart */
 139         /* bytes 9-15 do not seem to affect exposure or image quality */
 140 
 141         mutex_lock(&gspca_dev->usb_lock);
 142         ret = vicam_control_msg(gspca_dev, 0x51, 0x80, 0, req_data, 16);
 143         mutex_unlock(&gspca_dev->usb_lock);
 144         if (ret < 0)
 145                 return ret;
 146 
 147         ret = usb_bulk_msg(gspca_dev->dev,
 148                            usb_rcvbulkpipe(gspca_dev->dev, 0x81),
 149                            data, size, &act_len, 10000);
 150         /* successful, it returns 0, otherwise  negative */
 151         if (ret < 0 || act_len != size) {
 152                 pr_err("bulk read fail (%d) len %d/%d\n",
 153                        ret, act_len, size);
 154                 return -EIO;
 155         }
 156         return 0;
 157 }
 158 
 159 /*
 160  * This function is called as a workqueue function and runs whenever the camera
 161  * is streaming data. Because it is a workqueue function it is allowed to sleep
 162  * so we can use synchronous USB calls. To avoid possible collisions with other
 163  * threads attempting to use gspca_dev->usb_buf we take the usb_lock when
 164  * performing USB operations using it. In practice we don't really need this
 165  * as the cameras controls are only written from the workqueue.
 166  */
 167 static void vicam_dostream(struct work_struct *work)
 168 {
 169         struct sd *sd = container_of(work, struct sd, work_struct);
 170         struct gspca_dev *gspca_dev = &sd->gspca_dev;
 171         int ret, frame_sz;
 172         u8 *buffer;
 173 
 174         frame_sz = gspca_dev->cam.cam_mode[gspca_dev->curr_mode].sizeimage +
 175                    HEADER_SIZE;
 176         buffer = kmalloc(frame_sz, GFP_KERNEL);
 177         if (!buffer) {
 178                 pr_err("Couldn't allocate USB buffer\n");
 179                 goto exit;
 180         }
 181 
 182         while (gspca_dev->present && gspca_dev->streaming) {
 183 #ifdef CONFIG_PM
 184                 if (gspca_dev->frozen)
 185                         break;
 186 #endif
 187                 ret = vicam_read_frame(gspca_dev, buffer, frame_sz);
 188                 if (ret < 0)
 189                         break;
 190 
 191                 /* Note the frame header contents seem to be completely
 192                    constant, they do not change with either image, or
 193                    settings. So we simply discard it. The frames have
 194                    a very similar 64 byte footer, which we don't even
 195                    bother reading from the cam */
 196                 gspca_frame_add(gspca_dev, FIRST_PACKET,
 197                                 buffer + HEADER_SIZE,
 198                                 frame_sz - HEADER_SIZE);
 199                 gspca_frame_add(gspca_dev, LAST_PACKET, NULL, 0);
 200         }
 201 exit:
 202         kfree(buffer);
 203 }
 204 
 205 /* This function is called at probe time just before sd_init */
 206 static int sd_config(struct gspca_dev *gspca_dev,
 207                 const struct usb_device_id *id)
 208 {
 209         struct cam *cam = &gspca_dev->cam;
 210         struct sd *sd = (struct sd *)gspca_dev;
 211 
 212         /* We don't use the buffer gspca allocates so make it small. */
 213         cam->bulk = 1;
 214         cam->bulk_size = 64;
 215         cam->cam_mode = vicam_mode;
 216         cam->nmodes = ARRAY_SIZE(vicam_mode);
 217 
 218         INIT_WORK(&sd->work_struct, vicam_dostream);
 219 
 220         return 0;
 221 }
 222 
 223 /* this function is called at probe and resume time */
 224 static int sd_init(struct gspca_dev *gspca_dev)
 225 {
 226         int ret;
 227         const struct ihex_binrec *rec;
 228         const struct firmware *uninitialized_var(fw);
 229         u8 *firmware_buf;
 230 
 231         ret = request_ihex_firmware(&fw, VICAM_FIRMWARE,
 232                                     &gspca_dev->dev->dev);
 233         if (ret) {
 234                 pr_err("Failed to load \"vicam/firmware.fw\": %d\n", ret);
 235                 return ret;
 236         }
 237 
 238         firmware_buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
 239         if (!firmware_buf) {
 240                 ret = -ENOMEM;
 241                 goto exit;
 242         }
 243         for (rec = (void *)fw->data; rec; rec = ihex_next_binrec(rec)) {
 244                 memcpy(firmware_buf, rec->data, be16_to_cpu(rec->len));
 245                 ret = vicam_control_msg(gspca_dev, 0xff, 0, 0, firmware_buf,
 246                                         be16_to_cpu(rec->len));
 247                 if (ret < 0)
 248                         break;
 249         }
 250 
 251         kfree(firmware_buf);
 252 exit:
 253         release_firmware(fw);
 254         return ret;
 255 }
 256 
 257 /* Set up for getting frames. */
 258 static int sd_start(struct gspca_dev *gspca_dev)
 259 {
 260         struct sd *sd = (struct sd *)gspca_dev;
 261         int ret;
 262 
 263         ret = vicam_set_camera_power(gspca_dev, 1);
 264         if (ret < 0)
 265                 return ret;
 266 
 267         schedule_work(&sd->work_struct);
 268 
 269         return 0;
 270 }
 271 
 272 /* called on streamoff with alt==0 and on disconnect */
 273 /* the usb_lock is held at entry - restore on exit */
 274 static void sd_stop0(struct gspca_dev *gspca_dev)
 275 {
 276         struct sd *dev = (struct sd *)gspca_dev;
 277 
 278         /* wait for the work queue to terminate */
 279         mutex_unlock(&gspca_dev->usb_lock);
 280         /* This waits for vicam_dostream to finish */
 281         flush_work(&dev->work_struct);
 282         mutex_lock(&gspca_dev->usb_lock);
 283 
 284         if (gspca_dev->present)
 285                 vicam_set_camera_power(gspca_dev, 0);
 286 }
 287 
 288 static int sd_init_controls(struct gspca_dev *gspca_dev)
 289 {
 290         struct v4l2_ctrl_handler *hdl = &gspca_dev->ctrl_handler;
 291 
 292         gspca_dev->vdev.ctrl_handler = hdl;
 293         v4l2_ctrl_handler_init(hdl, 2);
 294         gspca_dev->exposure = v4l2_ctrl_new_std(hdl, NULL,
 295                         V4L2_CID_EXPOSURE, 0, 2047, 1, 256);
 296         gspca_dev->gain = v4l2_ctrl_new_std(hdl, NULL,
 297                         V4L2_CID_GAIN, 0, 255, 1, 200);
 298 
 299         if (hdl->error) {
 300                 pr_err("Could not initialize controls\n");
 301                 return hdl->error;
 302         }
 303         return 0;
 304 }
 305 
 306 /* Table of supported USB devices */
 307 static const struct usb_device_id device_table[] = {
 308         {USB_DEVICE(0x04c1, 0x009d)},
 309         {USB_DEVICE(0x0602, 0x1001)},
 310         {}
 311 };
 312 
 313 MODULE_DEVICE_TABLE(usb, device_table);
 314 
 315 /* sub-driver description */
 316 static const struct sd_desc sd_desc = {
 317         .name   = MODULE_NAME,
 318         .config = sd_config,
 319         .init   = sd_init,
 320         .init_controls = sd_init_controls,
 321         .start  = sd_start,
 322         .stop0  = sd_stop0,
 323 };
 324 
 325 /* -- device connect -- */
 326 static int sd_probe(struct usb_interface *intf,
 327                 const struct usb_device_id *id)
 328 {
 329         return gspca_dev_probe(intf, id,
 330                         &sd_desc,
 331                         sizeof(struct sd),
 332                         THIS_MODULE);
 333 }
 334 
 335 static struct usb_driver sd_driver = {
 336         .name       = MODULE_NAME,
 337         .id_table   = device_table,
 338         .probe      = sd_probe,
 339         .disconnect = gspca_disconnect,
 340 #ifdef CONFIG_PM
 341         .suspend = gspca_suspend,
 342         .resume  = gspca_resume,
 343         .reset_resume = gspca_resume,
 344 #endif
 345 };
 346 
 347 module_usb_driver(sd_driver);
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/media/usb/gspca/vicam.c

DEFINITIONS
