1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * SQ905 subdriver 4 * 5 * Copyright (C) 2008, 2009 Adam Baker and Theodore Kilgore 6 */ 7 8 /* 9 * History and Acknowledgments 10 * 11 * The original Linux driver for SQ905 based cameras was written by 12 * Marcell Lengyel and further developed by many other contributors 13 * and is available from http://sourceforge.net/projects/sqcam/ 14 * 15 * This driver takes advantage of the reverse engineering work done for 16 * that driver and for libgphoto2 but shares no code with them. 17 * 18 * This driver has used as a base the finepix driver and other gspca 19 * based drivers and may still contain code fragments taken from those 20 * drivers. 21 */ 22 23 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 24 25 #define MODULE_NAME "sq905" 26 27 #include <linux/workqueue.h> 28 #include <linux/slab.h> 29 #include "gspca.h" 30 31 MODULE_AUTHOR("Adam Baker <linux@baker-net.org.uk>, Theodore Kilgore <kilgota@auburn.edu>"); 32 MODULE_DESCRIPTION("GSPCA/SQ905 USB Camera Driver"); 33 MODULE_LICENSE("GPL"); 34 35 /* Default timeouts, in ms */ 36 #define SQ905_CMD_TIMEOUT 500 37 #define SQ905_DATA_TIMEOUT 1000 38 39 /* Maximum transfer size to use. */ 40 #define SQ905_MAX_TRANSFER 0x8000 41 #define FRAME_HEADER_LEN 64 42 43 /* The known modes, or registers. These go in the "value" slot. */ 44 45 /* 00 is "none" obviously */ 46 47 #define SQ905_BULK_READ 0x03 /* precedes any bulk read */ 48 #define SQ905_COMMAND 0x06 /* precedes the command codes below */ 49 #define SQ905_PING 0x07 /* when reading an "idling" command */ 50 #define SQ905_READ_DONE 0xc0 /* ack bulk read completed */ 51 52 /* Any non-zero value in the bottom 2 bits of the 2nd byte of 53 * the ID appears to indicate the camera can do 640*480. If the 54 * LSB of that byte is set the image is just upside down, otherwise 55 * it is rotated 180 degrees. */ 56 #define SQ905_HIRES_MASK 0x00000300 57 #define SQ905_ORIENTATION_MASK 0x00000100 58 59 /* Some command codes. These go in the "index" slot. */ 60 61 #define SQ905_ID 0xf0 /* asks for model string */ 62 #define SQ905_CONFIG 0x20 /* gets photo alloc. table, not used here */ 63 #define SQ905_DATA 0x30 /* accesses photo data, not used here */ 64 #define SQ905_CLEAR 0xa0 /* clear everything */ 65 #define SQ905_CAPTURE_LOW 0x60 /* Starts capture at 160x120 */ 66 #define SQ905_CAPTURE_MED 0x61 /* Starts capture at 320x240 */ 67 #define SQ905_CAPTURE_HIGH 0x62 /* Starts capture at 640x480 (some cams only) */ 68 /* note that the capture command also controls the output dimensions */ 69 70 /* Structure to hold all of our device specific stuff */ 71 struct sd { 72 struct gspca_dev gspca_dev; /* !! must be the first item */ 73 74 /* 75 * Driver stuff 76 */ 77 struct work_struct work_struct; 78 struct workqueue_struct *work_thread; 79 }; 80 81 static struct v4l2_pix_format sq905_mode[] = { 82 { 160, 120, V4L2_PIX_FMT_SBGGR8, V4L2_FIELD_NONE, 83 .bytesperline = 160, 84 .sizeimage = 160 * 120, 85 .colorspace = V4L2_COLORSPACE_SRGB, 86 .priv = 0}, 87 { 320, 240, V4L2_PIX_FMT_SBGGR8, V4L2_FIELD_NONE, 88 .bytesperline = 320, 89 .sizeimage = 320 * 240, 90 .colorspace = V4L2_COLORSPACE_SRGB, 91 .priv = 0}, 92 { 640, 480, V4L2_PIX_FMT_SBGGR8, V4L2_FIELD_NONE, 93 .bytesperline = 640, 94 .sizeimage = 640 * 480, 95 .colorspace = V4L2_COLORSPACE_SRGB, 96 .priv = 0} 97 }; 98 99 /* 100 * Send a command to the camera. 101 */ 102 static int sq905_command(struct gspca_dev *gspca_dev, u16 index) 103 { 104 int ret; 105 106 gspca_dev->usb_buf[0] = '\0'; 107 ret = usb_control_msg(gspca_dev->dev, 108 usb_sndctrlpipe(gspca_dev->dev, 0), 109 USB_REQ_SYNCH_FRAME, /* request */ 110 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE, 111 SQ905_COMMAND, index, gspca_dev->usb_buf, 1, 112 SQ905_CMD_TIMEOUT); 113 if (ret < 0) { 114 pr_err("%s: usb_control_msg failed (%d)\n", __func__, ret); 115 return ret; 116 } 117 118 ret = usb_control_msg(gspca_dev->dev, 119 usb_rcvctrlpipe(gspca_dev->dev, 0), 120 USB_REQ_SYNCH_FRAME, /* request */ 121 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE, 122 SQ905_PING, 0, gspca_dev->usb_buf, 1, 123 SQ905_CMD_TIMEOUT); 124 if (ret < 0) { 125 pr_err("%s: usb_control_msg failed 2 (%d)\n", __func__, ret); 126 return ret; 127 } 128 129 return 0; 130 } 131 132 /* 133 * Acknowledge the end of a frame - see warning on sq905_command. 134 */ 135 static int sq905_ack_frame(struct gspca_dev *gspca_dev) 136 { 137 int ret; 138 139 gspca_dev->usb_buf[0] = '\0'; 140 ret = usb_control_msg(gspca_dev->dev, 141 usb_sndctrlpipe(gspca_dev->dev, 0), 142 USB_REQ_SYNCH_FRAME, /* request */ 143 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE, 144 SQ905_READ_DONE, 0, gspca_dev->usb_buf, 1, 145 SQ905_CMD_TIMEOUT); 146 if (ret < 0) { 147 pr_err("%s: usb_control_msg failed (%d)\n", __func__, ret); 148 return ret; 149 } 150 151 return 0; 152 } 153 154 /* 155 * request and read a block of data - see warning on sq905_command. 156 */ 157 static int 158 sq905_read_data(struct gspca_dev *gspca_dev, u8 *data, int size, int need_lock) 159 { 160 int ret; 161 int act_len = 0; 162 163 gspca_dev->usb_buf[0] = '\0'; 164 if (need_lock) 165 mutex_lock(&gspca_dev->usb_lock); 166 ret = usb_control_msg(gspca_dev->dev, 167 usb_sndctrlpipe(gspca_dev->dev, 0), 168 USB_REQ_SYNCH_FRAME, /* request */ 169 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE, 170 SQ905_BULK_READ, size, gspca_dev->usb_buf, 171 1, SQ905_CMD_TIMEOUT); 172 if (need_lock) 173 mutex_unlock(&gspca_dev->usb_lock); 174 if (ret < 0) { 175 pr_err("%s: usb_control_msg failed (%d)\n", __func__, ret); 176 return ret; 177 } 178 ret = usb_bulk_msg(gspca_dev->dev, 179 usb_rcvbulkpipe(gspca_dev->dev, 0x81), 180 data, size, &act_len, SQ905_DATA_TIMEOUT); 181 182 /* successful, it returns 0, otherwise negative */ 183 if (ret < 0 || act_len != size) { 184 pr_err("bulk read fail (%d) len %d/%d\n", ret, act_len, size); 185 return -EIO; 186 } 187 return 0; 188 } 189 190 /* 191 * This function is called as a workqueue function and runs whenever the camera 192 * is streaming data. Because it is a workqueue function it is allowed to sleep 193 * so we can use synchronous USB calls. To avoid possible collisions with other 194 * threads attempting to use gspca_dev->usb_buf we take the usb_lock when 195 * performing USB operations using it. In practice we don't really need this 196 * as the camera doesn't provide any controls. 197 */ 198 static void sq905_dostream(struct work_struct *work) 199 { 200 struct sd *dev = container_of(work, struct sd, work_struct); 201 struct gspca_dev *gspca_dev = &dev->gspca_dev; 202 int bytes_left; /* bytes remaining in current frame. */ 203 int data_len; /* size to use for the next read. */ 204 int header_read; /* true if we have already read the frame header. */ 205 int packet_type; 206 int frame_sz; 207 int ret; 208 u8 *data; 209 u8 *buffer; 210 211 buffer = kmalloc(SQ905_MAX_TRANSFER, GFP_KERNEL); 212 if (!buffer) { 213 pr_err("Couldn't allocate USB buffer\n"); 214 goto quit_stream; 215 } 216 217 frame_sz = gspca_dev->cam.cam_mode[gspca_dev->curr_mode].sizeimage 218 + FRAME_HEADER_LEN; 219 220 while (gspca_dev->present && gspca_dev->streaming) { 221 #ifdef CONFIG_PM 222 if (gspca_dev->frozen) 223 break; 224 #endif 225 /* request some data and then read it until we have 226 * a complete frame. */ 227 bytes_left = frame_sz; 228 header_read = 0; 229 230 /* Note we do not check for gspca_dev->streaming here, as 231 we must finish reading an entire frame, otherwise the 232 next time we stream we start reading in the middle of a 233 frame. */ 234 while (bytes_left > 0 && gspca_dev->present) { 235 data_len = bytes_left > SQ905_MAX_TRANSFER ? 236 SQ905_MAX_TRANSFER : bytes_left; 237 ret = sq905_read_data(gspca_dev, buffer, data_len, 1); 238 if (ret < 0) 239 goto quit_stream; 240 gspca_dbg(gspca_dev, D_PACK, 241 "Got %d bytes out of %d for frame\n", 242 data_len, bytes_left); 243 bytes_left -= data_len; 244 data = buffer; 245 if (!header_read) { 246 packet_type = FIRST_PACKET; 247 /* The first 64 bytes of each frame are 248 * a header full of FF 00 bytes */ 249 data += FRAME_HEADER_LEN; 250 data_len -= FRAME_HEADER_LEN; 251 header_read = 1; 252 } else if (bytes_left == 0) { 253 packet_type = LAST_PACKET; 254 } else { 255 packet_type = INTER_PACKET; 256 } 257 gspca_frame_add(gspca_dev, packet_type, 258 data, data_len); 259 /* If entire frame fits in one packet we still 260 need to add a LAST_PACKET */ 261 if (packet_type == FIRST_PACKET && 262 bytes_left == 0) 263 gspca_frame_add(gspca_dev, LAST_PACKET, 264 NULL, 0); 265 } 266 if (gspca_dev->present) { 267 /* acknowledge the frame */ 268 mutex_lock(&gspca_dev->usb_lock); 269 ret = sq905_ack_frame(gspca_dev); 270 mutex_unlock(&gspca_dev->usb_lock); 271 if (ret < 0) 272 goto quit_stream; 273 } 274 } 275 quit_stream: 276 if (gspca_dev->present) { 277 mutex_lock(&gspca_dev->usb_lock); 278 sq905_command(gspca_dev, SQ905_CLEAR); 279 mutex_unlock(&gspca_dev->usb_lock); 280 } 281 kfree(buffer); 282 } 283 284 /* This function is called at probe time just before sd_init */ 285 static int sd_config(struct gspca_dev *gspca_dev, 286 const struct usb_device_id *id) 287 { 288 struct cam *cam = &gspca_dev->cam; 289 struct sd *dev = (struct sd *) gspca_dev; 290 291 /* We don't use the buffer gspca allocates so make it small. */ 292 cam->bulk = 1; 293 cam->bulk_size = 64; 294 295 INIT_WORK(&dev->work_struct, sq905_dostream); 296 297 return 0; 298 } 299 300 /* called on streamoff with alt==0 and on disconnect */ 301 /* the usb_lock is held at entry - restore on exit */ 302 static void sd_stop0(struct gspca_dev *gspca_dev) 303 { 304 struct sd *dev = (struct sd *) gspca_dev; 305 306 /* wait for the work queue to terminate */ 307 mutex_unlock(&gspca_dev->usb_lock); 308 /* This waits for sq905_dostream to finish */ 309 destroy_workqueue(dev->work_thread); 310 dev->work_thread = NULL; 311 mutex_lock(&gspca_dev->usb_lock); 312 } 313 314 /* this function is called at probe and resume time */ 315 static int sd_init(struct gspca_dev *gspca_dev) 316 { 317 u32 ident; 318 int ret; 319 320 /* connect to the camera and read 321 * the model ID and process that and put it away. 322 */ 323 ret = sq905_command(gspca_dev, SQ905_CLEAR); 324 if (ret < 0) 325 return ret; 326 ret = sq905_command(gspca_dev, SQ905_ID); 327 if (ret < 0) 328 return ret; 329 ret = sq905_read_data(gspca_dev, gspca_dev->usb_buf, 4, 0); 330 if (ret < 0) 331 return ret; 332 /* usb_buf is allocated with kmalloc so is aligned. 333 * Camera model number is the right way round if we assume this 334 * reverse engineered ID is supposed to be big endian. */ 335 ident = be32_to_cpup((__be32 *)gspca_dev->usb_buf); 336 ret = sq905_command(gspca_dev, SQ905_CLEAR); 337 if (ret < 0) 338 return ret; 339 gspca_dbg(gspca_dev, D_CONF, "SQ905 camera ID %08x detected\n", ident); 340 gspca_dev->cam.cam_mode = sq905_mode; 341 gspca_dev->cam.nmodes = ARRAY_SIZE(sq905_mode); 342 if (!(ident & SQ905_HIRES_MASK)) 343 gspca_dev->cam.nmodes--; 344 345 if (ident & SQ905_ORIENTATION_MASK) 346 gspca_dev->cam.input_flags = V4L2_IN_ST_VFLIP; 347 else 348 gspca_dev->cam.input_flags = V4L2_IN_ST_VFLIP | 349 V4L2_IN_ST_HFLIP; 350 return 0; 351 } 352 353 /* Set up for getting frames. */ 354 static int sd_start(struct gspca_dev *gspca_dev) 355 { 356 struct sd *dev = (struct sd *) gspca_dev; 357 int ret; 358 359 /* "Open the shutter" and set size, to start capture */ 360 switch (gspca_dev->curr_mode) { 361 default: 362 /* case 2: */ 363 gspca_dbg(gspca_dev, D_STREAM, "Start streaming at high resolution\n"); 364 ret = sq905_command(&dev->gspca_dev, SQ905_CAPTURE_HIGH); 365 break; 366 case 1: 367 gspca_dbg(gspca_dev, D_STREAM, "Start streaming at medium resolution\n"); 368 ret = sq905_command(&dev->gspca_dev, SQ905_CAPTURE_MED); 369 break; 370 case 0: 371 gspca_dbg(gspca_dev, D_STREAM, "Start streaming at low resolution\n"); 372 ret = sq905_command(&dev->gspca_dev, SQ905_CAPTURE_LOW); 373 } 374 375 if (ret < 0) { 376 gspca_err(gspca_dev, "Start streaming command failed\n"); 377 return ret; 378 } 379 /* Start the workqueue function to do the streaming */ 380 dev->work_thread = create_singlethread_workqueue(MODULE_NAME); 381 if (!dev->work_thread) 382 return -ENOMEM; 383 384 queue_work(dev->work_thread, &dev->work_struct); 385 386 return 0; 387 } 388 389 /* Table of supported USB devices */ 390 static const struct usb_device_id device_table[] = { 391 {USB_DEVICE(0x2770, 0x9120)}, 392 {} 393 }; 394 395 MODULE_DEVICE_TABLE(usb, device_table); 396 397 /* sub-driver description */ 398 static const struct sd_desc sd_desc = { 399 .name = MODULE_NAME, 400 .config = sd_config, 401 .init = sd_init, 402 .start = sd_start, 403 .stop0 = sd_stop0, 404 }; 405 406 /* -- device connect -- */ 407 static int sd_probe(struct usb_interface *intf, 408 const struct usb_device_id *id) 409 { 410 return gspca_dev_probe(intf, id, 411 &sd_desc, 412 sizeof(struct sd), 413 THIS_MODULE); 414 } 415 416 static struct usb_driver sd_driver = { 417 .name = MODULE_NAME, 418 .id_table = device_table, 419 .probe = sd_probe, 420 .disconnect = gspca_disconnect, 421 #ifdef CONFIG_PM 422 .suspend = gspca_suspend, 423 .resume = gspca_resume, 424 .reset_resume = gspca_resume, 425 #endif 426 }; 427 428 module_usb_driver(sd_driver); 429