4 * Copyright (C) 2008, 2009 Adam Baker and Theodore Kilgore
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 * History and Acknowledgments
24 * The original Linux driver for SQ905 based cameras was written by
25 * Marcell Lengyel and furter developed by many other contributers
26 * and is available from http://sourceforge.net/projects/sqcam/
28 * This driver takes advantage of the reverse engineering work done for
29 * that driver and for libgphoto2 but shares no code with them.
31 * This driver has used as a base the finepix driver and other gspca
32 * based drivers and may still contain code fragments taken from those
36 #define MODULE_NAME "sq905"
38 #include <linux/workqueue.h>
41 MODULE_AUTHOR("Adam Baker <linux@baker-net.org.uk>, "
42 "Theodore Kilgore <kilgota@auburn.edu>");
43 MODULE_DESCRIPTION("GSPCA/SQ905 USB Camera Driver");
44 MODULE_LICENSE("GPL");
46 /* Default timeouts, in ms */
47 #define SQ905_CMD_TIMEOUT 500
48 #define SQ905_DATA_TIMEOUT 1000
50 /* Maximum transfer size to use. */
51 #define SQ905_MAX_TRANSFER 0x8000
52 #define FRAME_HEADER_LEN 64
54 /* The known modes, or registers. These go in the "value" slot. */
56 /* 00 is "none" obviously */
58 #define SQ905_BULK_READ 0x03 /* precedes any bulk read */
59 #define SQ905_COMMAND 0x06 /* precedes the command codes below */
60 #define SQ905_PING 0x07 /* when reading an "idling" command */
61 #define SQ905_READ_DONE 0xc0 /* ack bulk read completed */
63 /* Any non-zero value in the bottom 2 bits of the 2nd byte of
64 * the ID appears to indicate the camera can do 640*480. If the
65 * LSB of that byte is set the image is just upside down, otherwise
66 * it is rotated 180 degrees. */
67 #define SQ905_HIRES_MASK 0x00000300
68 #define SQ905_ORIENTATION_MASK 0x00000100
70 /* Some command codes. These go in the "index" slot. */
72 #define SQ905_ID 0xf0 /* asks for model string */
73 #define SQ905_CONFIG 0x20 /* gets photo alloc. table, not used here */
74 #define SQ905_DATA 0x30 /* accesses photo data, not used here */
75 #define SQ905_CLEAR 0xa0 /* clear everything */
76 #define SQ905_CAPTURE_LOW 0x60 /* Starts capture at 160x120 */
77 #define SQ905_CAPTURE_MED 0x61 /* Starts capture at 320x240 */
78 #define SQ905_CAPTURE_HIGH 0x62 /* Starts capture at 640x480 (some cams only) */
79 /* note that the capture command also controls the output dimensions */
81 /* Structure to hold all of our device specific stuff */
83 struct gspca_dev gspca_dev; /* !! must be the first item */
88 struct work_struct work_struct;
89 struct workqueue_struct *work_thread;
92 static struct v4l2_pix_format sq905_mode[] = {
93 { 160, 120, V4L2_PIX_FMT_SBGGR8, V4L2_FIELD_NONE,
95 .sizeimage = 160 * 120,
96 .colorspace = V4L2_COLORSPACE_SRGB,
98 { 320, 240, V4L2_PIX_FMT_SBGGR8, V4L2_FIELD_NONE,
100 .sizeimage = 320 * 240,
101 .colorspace = V4L2_COLORSPACE_SRGB,
103 { 640, 480, V4L2_PIX_FMT_SBGGR8, V4L2_FIELD_NONE,
105 .sizeimage = 640 * 480,
106 .colorspace = V4L2_COLORSPACE_SRGB,
111 * Send a command to the camera.
113 static int sq905_command(struct gspca_dev *gspca_dev, u16 index)
117 gspca_dev->usb_buf[0] = '\0';
118 ret = usb_control_msg(gspca_dev->dev,
119 usb_sndctrlpipe(gspca_dev->dev, 0),
120 USB_REQ_SYNCH_FRAME, /* request */
121 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
122 SQ905_COMMAND, index, gspca_dev->usb_buf, 1,
125 PDEBUG(D_ERR, "%s: usb_control_msg failed (%d)",
130 ret = usb_control_msg(gspca_dev->dev,
131 usb_sndctrlpipe(gspca_dev->dev, 0),
132 USB_REQ_SYNCH_FRAME, /* request */
133 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
134 SQ905_PING, 0, gspca_dev->usb_buf, 1,
137 PDEBUG(D_ERR, "%s: usb_control_msg failed 2 (%d)",
146 * Acknowledge the end of a frame - see warning on sq905_command.
148 static int sq905_ack_frame(struct gspca_dev *gspca_dev)
152 gspca_dev->usb_buf[0] = '\0';
153 ret = usb_control_msg(gspca_dev->dev,
154 usb_sndctrlpipe(gspca_dev->dev, 0),
155 USB_REQ_SYNCH_FRAME, /* request */
156 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
157 SQ905_READ_DONE, 0, gspca_dev->usb_buf, 1,
160 PDEBUG(D_ERR, "%s: usb_control_msg failed (%d)", __func__, ret);
168 * request and read a block of data - see warning on sq905_command.
171 sq905_read_data(struct gspca_dev *gspca_dev, u8 *data, int size)
176 gspca_dev->usb_buf[0] = '\0';
177 ret = usb_control_msg(gspca_dev->dev,
178 usb_sndctrlpipe(gspca_dev->dev, 0),
179 USB_REQ_SYNCH_FRAME, /* request */
180 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
181 SQ905_BULK_READ, size, gspca_dev->usb_buf,
182 1, SQ905_CMD_TIMEOUT);
184 PDEBUG(D_ERR, "%s: usb_control_msg failed (%d)", __func__, ret);
187 ret = usb_bulk_msg(gspca_dev->dev,
188 usb_rcvbulkpipe(gspca_dev->dev, 0x81),
189 data, size, &act_len, SQ905_DATA_TIMEOUT);
191 /* successful, it returns 0, otherwise negative */
192 if (ret < 0 || act_len != size) {
193 PDEBUG(D_ERR, "bulk read fail (%d) len %d/%d",
200 /* This function is called as a workqueue function and runs whenever the camera
201 * is streaming data. Because it is a workqueue function it is allowed to sleep
202 * so we can use synchronous USB calls. To avoid possible collisions with other
203 * threads attempting to use the camera's USB interface we take the gspca
204 * usb_lock when performing USB operations. In practice the only thing we need
205 * to protect against is the usb_set_interface call that gspca makes during
206 * stream_off as the camera doesn't provide any controls that the user could try
209 static void sq905_dostream(struct work_struct *work)
211 struct sd *dev = container_of(work, struct sd, work_struct);
212 struct gspca_dev *gspca_dev = &dev->gspca_dev;
213 struct gspca_frame *frame;
214 int bytes_left; /* bytes remaining in current frame. */
215 int data_len; /* size to use for the next read. */
216 int header_read; /* true if we have already read the frame header. */
217 int discarding; /* true if we failed to get space for frame. */
224 buffer = kmalloc(SQ905_MAX_TRANSFER, GFP_KERNEL | GFP_DMA);
225 mutex_lock(&gspca_dev->usb_lock);
227 PDEBUG(D_ERR, "Couldn't allocate USB buffer");
231 frame_sz = gspca_dev->cam.cam_mode[gspca_dev->curr_mode].sizeimage
234 while (gspca_dev->present && gspca_dev->streaming) {
235 /* Need a short delay to ensure streaming flag was set by
236 * gspca and to make sure gspca can grab the mutex. */
237 mutex_unlock(&gspca_dev->usb_lock);
240 /* request some data and then read it until we have
241 * a complete frame. */
242 bytes_left = frame_sz;
246 while (bytes_left > 0) {
247 data_len = bytes_left > SQ905_MAX_TRANSFER ?
248 SQ905_MAX_TRANSFER : bytes_left;
249 mutex_lock(&gspca_dev->usb_lock);
250 if (!gspca_dev->present)
252 ret = sq905_read_data(gspca_dev, buffer, data_len);
255 mutex_unlock(&gspca_dev->usb_lock);
257 "Got %d bytes out of %d for frame",
258 data_len, bytes_left);
259 bytes_left -= data_len;
262 packet_type = FIRST_PACKET;
263 /* The first 64 bytes of each frame are
264 * a header full of FF 00 bytes */
265 data += FRAME_HEADER_LEN;
266 data_len -= FRAME_HEADER_LEN;
268 } else if (bytes_left == 0) {
269 packet_type = LAST_PACKET;
271 packet_type = INTER_PACKET;
273 frame = gspca_get_i_frame(gspca_dev);
274 if (frame && !discarding) {
275 frame = gspca_frame_add(gspca_dev, packet_type,
276 frame, data, data_len);
277 /* If entire frame fits in one packet we still
278 need to add a LAST_PACKET */
279 if (packet_type == FIRST_PACKET &&
281 frame = gspca_frame_add(gspca_dev,
288 /* acknowledge the frame */
289 mutex_lock(&gspca_dev->usb_lock);
290 if (!gspca_dev->present)
292 ret = sq905_ack_frame(gspca_dev);
297 /* the usb_lock is already acquired */
298 if (gspca_dev->present)
299 sq905_command(gspca_dev, SQ905_CLEAR);
300 mutex_unlock(&gspca_dev->usb_lock);
304 /* This function is called at probe time just before sd_init */
305 static int sd_config(struct gspca_dev *gspca_dev,
306 const struct usb_device_id *id)
308 struct cam *cam = &gspca_dev->cam;
309 struct sd *dev = (struct sd *) gspca_dev;
311 /* We don't use the buffer gspca allocates so make it small. */
314 INIT_WORK(&dev->work_struct, sq905_dostream);
319 /* called on streamoff with alt==0 and on disconnect */
320 /* the usb_lock is held at entry - restore on exit */
321 static void sd_stop0(struct gspca_dev *gspca_dev)
323 struct sd *dev = (struct sd *) gspca_dev;
325 /* wait for the work queue to terminate */
326 mutex_unlock(&gspca_dev->usb_lock);
327 /* This waits for sq905_dostream to finish */
328 destroy_workqueue(dev->work_thread);
329 dev->work_thread = NULL;
330 mutex_lock(&gspca_dev->usb_lock);
333 /* this function is called at probe and resume time */
334 static int sd_init(struct gspca_dev *gspca_dev)
339 /* connect to the camera and read
340 * the model ID and process that and put it away.
342 ret = sq905_command(gspca_dev, SQ905_CLEAR);
345 ret = sq905_command(gspca_dev, SQ905_ID);
348 ret = sq905_read_data(gspca_dev, gspca_dev->usb_buf, 4);
351 /* usb_buf is allocated with kmalloc so is aligned.
352 * Camera model number is the right way round if we assume this
353 * reverse engineered ID is supposed to be big endian. */
354 ident = be32_to_cpup((__be32 *)gspca_dev->usb_buf);
355 ret = sq905_command(gspca_dev, SQ905_CLEAR);
358 PDEBUG(D_CONF, "SQ905 camera ID %08x detected", ident);
359 gspca_dev->cam.cam_mode = sq905_mode;
360 gspca_dev->cam.nmodes = ARRAY_SIZE(sq905_mode);
361 if (!(ident & SQ905_HIRES_MASK))
362 gspca_dev->cam.nmodes--;
366 /* Set up for getting frames. */
367 static int sd_start(struct gspca_dev *gspca_dev)
369 struct sd *dev = (struct sd *) gspca_dev;
372 /* "Open the shutter" and set size, to start capture */
373 switch (gspca_dev->curr_mode) {
376 PDEBUG(D_STREAM, "Start streaming at high resolution");
377 ret = sq905_command(&dev->gspca_dev, SQ905_CAPTURE_HIGH);
380 PDEBUG(D_STREAM, "Start streaming at medium resolution");
381 ret = sq905_command(&dev->gspca_dev, SQ905_CAPTURE_MED);
384 PDEBUG(D_STREAM, "Start streaming at low resolution");
385 ret = sq905_command(&dev->gspca_dev, SQ905_CAPTURE_LOW);
389 PDEBUG(D_ERR, "Start streaming command failed");
392 /* Start the workqueue function to do the streaming */
393 dev->work_thread = create_singlethread_workqueue(MODULE_NAME);
394 queue_work(dev->work_thread, &dev->work_struct);
399 /* Table of supported USB devices */
400 static const __devinitdata struct usb_device_id device_table[] = {
401 {USB_DEVICE(0x2770, 0x9120)},
405 MODULE_DEVICE_TABLE(usb, device_table);
407 /* sub-driver description */
408 static const struct sd_desc sd_desc = {
416 /* -- device connect -- */
417 static int sd_probe(struct usb_interface *intf,
418 const struct usb_device_id *id)
420 return gspca_dev_probe(intf, id,
426 static struct usb_driver sd_driver = {
428 .id_table = device_table,
430 .disconnect = gspca_disconnect,
432 .suspend = gspca_suspend,
433 .resume = gspca_resume,
437 /* -- module insert / remove -- */
438 static int __init sd_mod_init(void)
442 ret = usb_register(&sd_driver);
445 PDEBUG(D_PROBE, "registered");
449 static void __exit sd_mod_exit(void)
451 usb_deregister(&sd_driver);
452 PDEBUG(D_PROBE, "deregistered");
455 module_init(sd_mod_init);
456 module_exit(sd_mod_exit);