drivers/media/usb/gspca/finepix.c

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This source file includes following definitions.
command
dostream
sd_config
sd_init
sd_start
sd_stop0
sd_probe
   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Fujifilm Finepix subdriver
   4  *
   5  * Copyright (C) 2008 Frank Zago
   6  */
   7 
   8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   9 
  10 #define MODULE_NAME "finepix"
  11 
  12 #include "gspca.h"
  13 
  14 MODULE_AUTHOR("Frank Zago <frank@zago.net>");
  15 MODULE_DESCRIPTION("Fujifilm FinePix USB V4L2 driver");
  16 MODULE_LICENSE("GPL");
  17 
  18 /* Default timeout, in ms */
  19 #define FPIX_TIMEOUT 250
  20 
  21 /* Maximum transfer size to use. The windows driver reads by chunks of
  22  * 0x2000 bytes, so do the same. Note: reading more seems to work
  23  * too. */
  24 #define FPIX_MAX_TRANSFER 0x2000
  25 
  26 /* Structure to hold all of our device specific stuff */
  27 struct usb_fpix {
  28         struct gspca_dev gspca_dev;     /* !! must be the first item */
  29 
  30         struct work_struct work_struct;
  31 };
  32 
  33 /* Delay after which claim the next frame. If the delay is too small,
  34  * the camera will return old frames. On the 4800Z, 20ms is bad, 25ms
  35  * will fail every 4 or 5 frames, but 30ms is perfect. On the A210,
  36  * 30ms is bad while 35ms is perfect. */
  37 #define NEXT_FRAME_DELAY 35
  38 
  39 /* These cameras only support 320x200. */
  40 static const struct v4l2_pix_format fpix_mode[1] = {
  41         { 320, 240, V4L2_PIX_FMT_JPEG, V4L2_FIELD_NONE,
  42                 .bytesperline = 320,
  43                 .sizeimage = 320 * 240 * 3 / 8 + 590,
  44                 .colorspace = V4L2_COLORSPACE_SRGB,
  45                 .priv = 0}
  46 };
  47 
  48 /* send a command to the webcam */
  49 static int command(struct gspca_dev *gspca_dev,
  50                 int order)      /* 0: reset, 1: frame request */
  51 {
  52         static u8 order_values[2][12] = {
  53                 {0xc6, 0, 0, 0, 0, 0, 0,    0, 0x20, 0, 0, 0},  /* reset */
  54                 {0xd3, 0, 0, 0, 0, 0, 0, 0x01,    0, 0, 0, 0},  /* fr req */
  55         };
  56 
  57         memcpy(gspca_dev->usb_buf, order_values[order], 12);
  58         return usb_control_msg(gspca_dev->dev,
  59                         usb_sndctrlpipe(gspca_dev->dev, 0),
  60                         USB_REQ_GET_STATUS,
  61                         USB_DIR_OUT | USB_TYPE_CLASS |
  62                         USB_RECIP_INTERFACE, 0, 0, gspca_dev->usb_buf,
  63                         12, FPIX_TIMEOUT);
  64 }
  65 
  66 /*
  67  * This function is called as a workqueue function and runs whenever the camera
  68  * is streaming data. Because it is a workqueue function it is allowed to sleep
  69  * so we can use synchronous USB calls. To avoid possible collisions with other
  70  * threads attempting to use gspca_dev->usb_buf we take the usb_lock when
  71  * performing USB operations using it. In practice we don't really need this
  72  * as the camera doesn't provide any controls.
  73  */
  74 static void dostream(struct work_struct *work)
  75 {
  76         struct usb_fpix *dev = container_of(work, struct usb_fpix, work_struct);
  77         struct gspca_dev *gspca_dev = &dev->gspca_dev;
  78         struct urb *urb = gspca_dev->urb[0];
  79         u8 *data = urb->transfer_buffer;
  80         int ret = 0;
  81         int len;
  82 
  83         gspca_dbg(gspca_dev, D_STREAM, "dostream started\n");
  84 
  85         /* loop reading a frame */
  86 again:
  87         while (gspca_dev->present && gspca_dev->streaming) {
  88 #ifdef CONFIG_PM
  89                 if (gspca_dev->frozen)
  90                         break;
  91 #endif
  92 
  93                 /* request a frame */
  94                 mutex_lock(&gspca_dev->usb_lock);
  95                 ret = command(gspca_dev, 1);
  96                 mutex_unlock(&gspca_dev->usb_lock);
  97                 if (ret < 0)
  98                         break;
  99 #ifdef CONFIG_PM
 100                 if (gspca_dev->frozen)
 101                         break;
 102 #endif
 103                 if (!gspca_dev->present || !gspca_dev->streaming)
 104                         break;
 105 
 106                 /* the frame comes in parts */
 107                 for (;;) {
 108                         ret = usb_bulk_msg(gspca_dev->dev,
 109                                         urb->pipe,
 110                                         data,
 111                                         FPIX_MAX_TRANSFER,
 112                                         &len, FPIX_TIMEOUT);
 113                         if (ret < 0) {
 114                                 /* Most of the time we get a timeout
 115                                  * error. Just restart. */
 116                                 goto again;
 117                         }
 118 #ifdef CONFIG_PM
 119                         if (gspca_dev->frozen)
 120                                 goto out;
 121 #endif
 122                         if (!gspca_dev->present || !gspca_dev->streaming)
 123                                 goto out;
 124                         if (len < FPIX_MAX_TRANSFER ||
 125                                 (data[len - 2] == 0xff &&
 126                                         data[len - 1] == 0xd9)) {
 127 
 128                                 /* If the result is less than what was asked
 129                                  * for, then it's the end of the
 130                                  * frame. Sometimes the jpeg is not complete,
 131                                  * but there's nothing we can do. We also end
 132                                  * here if the the jpeg ends right at the end
 133                                  * of the frame. */
 134                                 gspca_frame_add(gspca_dev, LAST_PACKET,
 135                                                 data, len);
 136                                 break;
 137                         }
 138 
 139                         /* got a partial image */
 140                         gspca_frame_add(gspca_dev,
 141                                         gspca_dev->last_packet_type
 142                                                 == LAST_PACKET
 143                                         ? FIRST_PACKET : INTER_PACKET,
 144                                         data, len);
 145                 }
 146 
 147                 /* We must wait before trying reading the next
 148                  * frame. If we don't, or if the delay is too short,
 149                  * the camera will disconnect. */
 150                 msleep(NEXT_FRAME_DELAY);
 151         }
 152 
 153 out:
 154         gspca_dbg(gspca_dev, D_STREAM, "dostream stopped\n");
 155 }
 156 
 157 /* this function is called at probe time */
 158 static int sd_config(struct gspca_dev *gspca_dev,
 159                 const struct usb_device_id *id)
 160 {
 161         struct usb_fpix *dev = (struct usb_fpix *) gspca_dev;
 162         struct cam *cam = &gspca_dev->cam;
 163 
 164         cam->cam_mode = fpix_mode;
 165         cam->nmodes = 1;
 166         cam->bulk = 1;
 167         cam->bulk_size = FPIX_MAX_TRANSFER;
 168 
 169         INIT_WORK(&dev->work_struct, dostream);
 170 
 171         return 0;
 172 }
 173 
 174 /* this function is called at probe and resume time */
 175 static int sd_init(struct gspca_dev *gspca_dev)
 176 {
 177         return 0;
 178 }
 179 
 180 /* start the camera */
 181 static int sd_start(struct gspca_dev *gspca_dev)
 182 {
 183         struct usb_fpix *dev = (struct usb_fpix *) gspca_dev;
 184         int ret, len;
 185 
 186         /* Init the device */
 187         ret = command(gspca_dev, 0);
 188         if (ret < 0) {
 189                 pr_err("init failed %d\n", ret);
 190                 return ret;
 191         }
 192 
 193         /* Read the result of the command. Ignore the result, for it
 194          * varies with the device. */
 195         ret = usb_bulk_msg(gspca_dev->dev,
 196                         gspca_dev->urb[0]->pipe,
 197                         gspca_dev->urb[0]->transfer_buffer,
 198                         FPIX_MAX_TRANSFER, &len,
 199                         FPIX_TIMEOUT);
 200         if (ret < 0) {
 201                 pr_err("usb_bulk_msg failed %d\n", ret);
 202                 return ret;
 203         }
 204 
 205         /* Request a frame, but don't read it */
 206         ret = command(gspca_dev, 1);
 207         if (ret < 0) {
 208                 pr_err("frame request failed %d\n", ret);
 209                 return ret;
 210         }
 211 
 212         /* Again, reset bulk in endpoint */
 213         usb_clear_halt(gspca_dev->dev, gspca_dev->urb[0]->pipe);
 214 
 215         schedule_work(&dev->work_struct);
 216 
 217         return 0;
 218 }
 219 
 220 /* called on streamoff with alt==0 and on disconnect */
 221 /* the usb_lock is held at entry - restore on exit */
 222 static void sd_stop0(struct gspca_dev *gspca_dev)
 223 {
 224         struct usb_fpix *dev = (struct usb_fpix *) gspca_dev;
 225 
 226         /* wait for the work queue to terminate */
 227         mutex_unlock(&gspca_dev->usb_lock);
 228         flush_work(&dev->work_struct);
 229         mutex_lock(&gspca_dev->usb_lock);
 230 }
 231 
 232 /* Table of supported USB devices */
 233 static const struct usb_device_id device_table[] = {
 234         {USB_DEVICE(0x04cb, 0x0104)},
 235         {USB_DEVICE(0x04cb, 0x0109)},
 236         {USB_DEVICE(0x04cb, 0x010b)},
 237         {USB_DEVICE(0x04cb, 0x010f)},
 238         {USB_DEVICE(0x04cb, 0x0111)},
 239         {USB_DEVICE(0x04cb, 0x0113)},
 240         {USB_DEVICE(0x04cb, 0x0115)},
 241         {USB_DEVICE(0x04cb, 0x0117)},
 242         {USB_DEVICE(0x04cb, 0x0119)},
 243         {USB_DEVICE(0x04cb, 0x011b)},
 244         {USB_DEVICE(0x04cb, 0x011d)},
 245         {USB_DEVICE(0x04cb, 0x0121)},
 246         {USB_DEVICE(0x04cb, 0x0123)},
 247         {USB_DEVICE(0x04cb, 0x0125)},
 248         {USB_DEVICE(0x04cb, 0x0127)},
 249         {USB_DEVICE(0x04cb, 0x0129)},
 250         {USB_DEVICE(0x04cb, 0x012b)},
 251         {USB_DEVICE(0x04cb, 0x012d)},
 252         {USB_DEVICE(0x04cb, 0x012f)},
 253         {USB_DEVICE(0x04cb, 0x0131)},
 254         {USB_DEVICE(0x04cb, 0x013b)},
 255         {USB_DEVICE(0x04cb, 0x013d)},
 256         {USB_DEVICE(0x04cb, 0x013f)},
 257         {}
 258 };
 259 
 260 MODULE_DEVICE_TABLE(usb, device_table);
 261 
 262 /* sub-driver description */
 263 static const struct sd_desc sd_desc = {
 264         .name   = MODULE_NAME,
 265         .config = sd_config,
 266         .init   = sd_init,
 267         .start  = sd_start,
 268         .stop0  = sd_stop0,
 269 };
 270 
 271 /* -- device connect -- */
 272 static int sd_probe(struct usb_interface *intf,
 273                 const struct usb_device_id *id)
 274 {
 275         return gspca_dev_probe(intf, id,
 276                         &sd_desc,
 277                         sizeof(struct usb_fpix),
 278                         THIS_MODULE);
 279 }
 280 
 281 static struct usb_driver sd_driver = {
 282         .name       = MODULE_NAME,
 283         .id_table   = device_table,
 284         .probe      = sd_probe,
 285         .disconnect = gspca_disconnect,
 286 #ifdef CONFIG_PM
 287         .suspend = gspca_suspend,
 288         .resume  = gspca_resume,
 289         .reset_resume = gspca_resume,
 290 #endif
 291 };
 292 
 293 module_usb_driver(sd_driver);
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/media/usb/gspca/finepix.c

DEFINITIONS
