drivers/media/usb/gspca/sq905c.c

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This source file includes following definitions.
sq905c_command
sq905c_read
sq905c_dostream
sd_config
sd_stop0
sd_init
sd_start
sd_probe
   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * SQ905C subdriver
   4  *
   5  * Copyright (C) 2009 Theodore Kilgore
   6  */
   7 
   8 /*
   9  *
  10  * This driver uses work done in
  11  * libgphoto2/camlibs/digigr8, Copyright (C) Theodore Kilgore.
  12  *
  13  * This driver has also used as a base the sq905c driver
  14  * and may contain code fragments from it.
  15  */
  16 
  17 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  18 
  19 #define MODULE_NAME "sq905c"
  20 
  21 #include <linux/workqueue.h>
  22 #include <linux/slab.h>
  23 #include "gspca.h"
  24 
  25 MODULE_AUTHOR("Theodore Kilgore <kilgota@auburn.edu>");
  26 MODULE_DESCRIPTION("GSPCA/SQ905C USB Camera Driver");
  27 MODULE_LICENSE("GPL");
  28 
  29 /* Default timeouts, in ms */
  30 #define SQ905C_CMD_TIMEOUT 500
  31 #define SQ905C_DATA_TIMEOUT 1000
  32 
  33 /* Maximum transfer size to use. */
  34 #define SQ905C_MAX_TRANSFER 0x8000
  35 
  36 #define FRAME_HEADER_LEN 0x50
  37 
  38 /* Commands. These go in the "value" slot. */
  39 #define SQ905C_CLEAR   0xa0             /* clear everything */
  40 #define SQ905C_GET_ID  0x14f4           /* Read version number */
  41 #define SQ905C_CAPTURE_LOW 0xa040       /* Starts capture at 160x120 */
  42 #define SQ905C_CAPTURE_MED 0x1440       /* Starts capture at 320x240 */
  43 #define SQ905C_CAPTURE_HI 0x2840        /* Starts capture at 320x240 */
  44 
  45 /* For capture, this must go in the "index" slot. */
  46 #define SQ905C_CAPTURE_INDEX 0x110f
  47 
  48 /* Structure to hold all of our device specific stuff */
  49 struct sd {
  50         struct gspca_dev gspca_dev;     /* !! must be the first item */
  51         const struct v4l2_pix_format *cap_mode;
  52         /* Driver stuff */
  53         struct work_struct work_struct;
  54         struct workqueue_struct *work_thread;
  55 };
  56 
  57 /*
  58  * Most of these cameras will do 640x480 and 320x240. 160x120 works
  59  * in theory but gives very poor output. Therefore, not supported.
  60  * The 0x2770:0x9050 cameras have max resolution of 320x240.
  61  */
  62 static struct v4l2_pix_format sq905c_mode[] = {
  63         { 320, 240, V4L2_PIX_FMT_SQ905C, V4L2_FIELD_NONE,
  64                 .bytesperline = 320,
  65                 .sizeimage = 320 * 240,
  66                 .colorspace = V4L2_COLORSPACE_SRGB,
  67                 .priv = 0},
  68         { 640, 480, V4L2_PIX_FMT_SQ905C, V4L2_FIELD_NONE,
  69                 .bytesperline = 640,
  70                 .sizeimage = 640 * 480,
  71                 .colorspace = V4L2_COLORSPACE_SRGB,
  72                 .priv = 0}
  73 };
  74 
  75 /* Send a command to the camera. */
  76 static int sq905c_command(struct gspca_dev *gspca_dev, u16 command, u16 index)
  77 {
  78         int ret;
  79 
  80         ret = usb_control_msg(gspca_dev->dev,
  81                               usb_sndctrlpipe(gspca_dev->dev, 0),
  82                               USB_REQ_SYNCH_FRAME,                /* request */
  83                               USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  84                               command, index, NULL, 0,
  85                               SQ905C_CMD_TIMEOUT);
  86         if (ret < 0) {
  87                 pr_err("%s: usb_control_msg failed (%d)\n", __func__, ret);
  88                 return ret;
  89         }
  90 
  91         return 0;
  92 }
  93 
  94 static int sq905c_read(struct gspca_dev *gspca_dev, u16 command, u16 index,
  95                        int size)
  96 {
  97         int ret;
  98 
  99         ret = usb_control_msg(gspca_dev->dev,
 100                               usb_rcvctrlpipe(gspca_dev->dev, 0),
 101                               USB_REQ_SYNCH_FRAME,              /* request */
 102                               USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 103                               command, index, gspca_dev->usb_buf, size,
 104                               SQ905C_CMD_TIMEOUT);
 105         if (ret < 0) {
 106                 pr_err("%s: usb_control_msg failed (%d)\n", __func__, ret);
 107                 return ret;
 108         }
 109 
 110         return 0;
 111 }
 112 
 113 /*
 114  * This function is called as a workqueue function and runs whenever the camera
 115  * is streaming data. Because it is a workqueue function it is allowed to sleep
 116  * so we can use synchronous USB calls. To avoid possible collisions with other
 117  * threads attempting to use gspca_dev->usb_buf we take the usb_lock when
 118  * performing USB operations using it. In practice we don't really need this
 119  * as the camera doesn't provide any controls.
 120  */
 121 static void sq905c_dostream(struct work_struct *work)
 122 {
 123         struct sd *dev = container_of(work, struct sd, work_struct);
 124         struct gspca_dev *gspca_dev = &dev->gspca_dev;
 125         int bytes_left; /* bytes remaining in current frame. */
 126         int data_len;   /* size to use for the next read. */
 127         int act_len;
 128         int packet_type;
 129         int ret;
 130         u8 *buffer;
 131 
 132         buffer = kmalloc(SQ905C_MAX_TRANSFER, GFP_KERNEL);
 133         if (!buffer) {
 134                 pr_err("Couldn't allocate USB buffer\n");
 135                 goto quit_stream;
 136         }
 137 
 138         while (gspca_dev->present && gspca_dev->streaming) {
 139 #ifdef CONFIG_PM
 140                 if (gspca_dev->frozen)
 141                         break;
 142 #endif
 143                 /* Request the header, which tells the size to download */
 144                 ret = usb_bulk_msg(gspca_dev->dev,
 145                                 usb_rcvbulkpipe(gspca_dev->dev, 0x81),
 146                                 buffer, FRAME_HEADER_LEN, &act_len,
 147                                 SQ905C_DATA_TIMEOUT);
 148                 gspca_dbg(gspca_dev, D_STREAM,
 149                           "Got %d bytes out of %d for header\n",
 150                           act_len, FRAME_HEADER_LEN);
 151                 if (ret < 0 || act_len < FRAME_HEADER_LEN)
 152                         goto quit_stream;
 153                 /* size is read from 4 bytes starting 0x40, little endian */
 154                 bytes_left = buffer[0x40]|(buffer[0x41]<<8)|(buffer[0x42]<<16)
 155                                         |(buffer[0x43]<<24);
 156                 gspca_dbg(gspca_dev, D_STREAM, "bytes_left = 0x%x\n",
 157                           bytes_left);
 158                 /* We keep the header. It has other information, too. */
 159                 packet_type = FIRST_PACKET;
 160                 gspca_frame_add(gspca_dev, packet_type,
 161                                 buffer, FRAME_HEADER_LEN);
 162                 while (bytes_left > 0 && gspca_dev->present) {
 163                         data_len = bytes_left > SQ905C_MAX_TRANSFER ?
 164                                 SQ905C_MAX_TRANSFER : bytes_left;
 165                         ret = usb_bulk_msg(gspca_dev->dev,
 166                                 usb_rcvbulkpipe(gspca_dev->dev, 0x81),
 167                                 buffer, data_len, &act_len,
 168                                 SQ905C_DATA_TIMEOUT);
 169                         if (ret < 0 || act_len < data_len)
 170                                 goto quit_stream;
 171                         gspca_dbg(gspca_dev, D_STREAM,
 172                                   "Got %d bytes out of %d for frame\n",
 173                                   data_len, bytes_left);
 174                         bytes_left -= data_len;
 175                         if (bytes_left == 0)
 176                                 packet_type = LAST_PACKET;
 177                         else
 178                                 packet_type = INTER_PACKET;
 179                         gspca_frame_add(gspca_dev, packet_type,
 180                                         buffer, data_len);
 181                 }
 182         }
 183 quit_stream:
 184         if (gspca_dev->present) {
 185                 mutex_lock(&gspca_dev->usb_lock);
 186                 sq905c_command(gspca_dev, SQ905C_CLEAR, 0);
 187                 mutex_unlock(&gspca_dev->usb_lock);
 188         }
 189         kfree(buffer);
 190 }
 191 
 192 /* This function is called at probe time just before sd_init */
 193 static int sd_config(struct gspca_dev *gspca_dev,
 194                 const struct usb_device_id *id)
 195 {
 196         struct cam *cam = &gspca_dev->cam;
 197         struct sd *dev = (struct sd *) gspca_dev;
 198         int ret;
 199 
 200         gspca_dbg(gspca_dev, D_PROBE,
 201                   "SQ9050 camera detected (vid/pid 0x%04X:0x%04X)\n",
 202                   id->idVendor, id->idProduct);
 203 
 204         ret = sq905c_command(gspca_dev, SQ905C_GET_ID, 0);
 205         if (ret < 0) {
 206                 gspca_err(gspca_dev, "Get version command failed\n");
 207                 return ret;
 208         }
 209 
 210         ret = sq905c_read(gspca_dev, 0xf5, 0, 20);
 211         if (ret < 0) {
 212                 gspca_err(gspca_dev, "Reading version command failed\n");
 213                 return ret;
 214         }
 215         /* Note we leave out the usb id and the manufacturing date */
 216         gspca_dbg(gspca_dev, D_PROBE,
 217                   "SQ9050 ID string: %02x - %*ph\n",
 218                   gspca_dev->usb_buf[3], 6, gspca_dev->usb_buf + 14);
 219 
 220         cam->cam_mode = sq905c_mode;
 221         cam->nmodes = 2;
 222         if (gspca_dev->usb_buf[15] == 0)
 223                 cam->nmodes = 1;
 224         /* We don't use the buffer gspca allocates so make it small. */
 225         cam->bulk_size = 32;
 226         cam->bulk = 1;
 227         INIT_WORK(&dev->work_struct, sq905c_dostream);
 228         return 0;
 229 }
 230 
 231 /* called on streamoff with alt==0 and on disconnect */
 232 /* the usb_lock is held at entry - restore on exit */
 233 static void sd_stop0(struct gspca_dev *gspca_dev)
 234 {
 235         struct sd *dev = (struct sd *) gspca_dev;
 236 
 237         /* wait for the work queue to terminate */
 238         mutex_unlock(&gspca_dev->usb_lock);
 239         /* This waits for sq905c_dostream to finish */
 240         destroy_workqueue(dev->work_thread);
 241         dev->work_thread = NULL;
 242         mutex_lock(&gspca_dev->usb_lock);
 243 }
 244 
 245 /* this function is called at probe and resume time */
 246 static int sd_init(struct gspca_dev *gspca_dev)
 247 {
 248         /* connect to the camera and reset it. */
 249         return sq905c_command(gspca_dev, SQ905C_CLEAR, 0);
 250 }
 251 
 252 /* Set up for getting frames. */
 253 static int sd_start(struct gspca_dev *gspca_dev)
 254 {
 255         struct sd *dev = (struct sd *) gspca_dev;
 256         int ret;
 257 
 258         dev->cap_mode = gspca_dev->cam.cam_mode;
 259         /* "Open the shutter" and set size, to start capture */
 260         switch (gspca_dev->pixfmt.width) {
 261         case 640:
 262                 gspca_dbg(gspca_dev, D_STREAM, "Start streaming at high resolution\n");
 263                 dev->cap_mode++;
 264                 ret = sq905c_command(gspca_dev, SQ905C_CAPTURE_HI,
 265                                                 SQ905C_CAPTURE_INDEX);
 266                 break;
 267         default: /* 320 */
 268                 gspca_dbg(gspca_dev, D_STREAM, "Start streaming at medium resolution\n");
 269                 ret = sq905c_command(gspca_dev, SQ905C_CAPTURE_MED,
 270                                                 SQ905C_CAPTURE_INDEX);
 271         }
 272 
 273         if (ret < 0) {
 274                 gspca_err(gspca_dev, "Start streaming command failed\n");
 275                 return ret;
 276         }
 277         /* Start the workqueue function to do the streaming */
 278         dev->work_thread = create_singlethread_workqueue(MODULE_NAME);
 279         queue_work(dev->work_thread, &dev->work_struct);
 280 
 281         return 0;
 282 }
 283 
 284 /* Table of supported USB devices */
 285 static const struct usb_device_id device_table[] = {
 286         {USB_DEVICE(0x2770, 0x905c)},
 287         {USB_DEVICE(0x2770, 0x9050)},
 288         {USB_DEVICE(0x2770, 0x9051)},
 289         {USB_DEVICE(0x2770, 0x9052)},
 290         {USB_DEVICE(0x2770, 0x913d)},
 291         {}
 292 };
 293 
 294 MODULE_DEVICE_TABLE(usb, device_table);
 295 
 296 /* sub-driver description */
 297 static const struct sd_desc sd_desc = {
 298         .name   = MODULE_NAME,
 299         .config = sd_config,
 300         .init   = sd_init,
 301         .start  = sd_start,
 302         .stop0  = sd_stop0,
 303 };
 304 
 305 /* -- device connect -- */
 306 static int sd_probe(struct usb_interface *intf,
 307                 const struct usb_device_id *id)
 308 {
 309         return gspca_dev_probe(intf, id,
 310                         &sd_desc,
 311                         sizeof(struct sd),
 312                         THIS_MODULE);
 313 }
 314 
 315 static struct usb_driver sd_driver = {
 316         .name       = MODULE_NAME,
 317         .id_table   = device_table,
 318         .probe      = sd_probe,
 319         .disconnect = gspca_disconnect,
 320 #ifdef CONFIG_PM
 321         .suspend = gspca_suspend,
 322         .resume  = gspca_resume,
 323         .reset_resume = gspca_resume,
 324 #endif
 325 };
 326 
 327 module_usb_driver(sd_driver);
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/media/usb/gspca/sq905c.c

DEFINITIONS
