summaryrefslogtreecommitdiff
path: root/drivers/media/usb/gspca/sq905.c
blob: ffea9c35b0a0659c05c089165bb634476d24d598 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
/*
 * SQ905 subdriver
 *
 * Copyright (C) 2008, 2009 Adam Baker and Theodore Kilgore
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 */

/*
 * History and Acknowledgments
 *
 * The original Linux driver for SQ905 based cameras was written by
 * Marcell Lengyel and furter developed by many other contributors
 * and is available from http://sourceforge.net/projects/sqcam/
 *
 * This driver takes advantage of the reverse engineering work done for
 * that driver and for libgphoto2 but shares no code with them.
 *
 * This driver has used as a base the finepix driver and other gspca
 * based drivers and may still contain code fragments taken from those
 * drivers.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#define MODULE_NAME "sq905"

#include <linux/workqueue.h>
#include <linux/slab.h>
#include "gspca.h"

MODULE_AUTHOR("Adam Baker <linux@baker-net.org.uk>, Theodore Kilgore <kilgota@auburn.edu>");
MODULE_DESCRIPTION("GSPCA/SQ905 USB Camera Driver");
MODULE_LICENSE("GPL");

/* Default timeouts, in ms */
#define SQ905_CMD_TIMEOUT 500
#define SQ905_DATA_TIMEOUT 1000

/* Maximum transfer size to use. */
#define SQ905_MAX_TRANSFER 0x8000
#define FRAME_HEADER_LEN 64

/* The known modes, or registers. These go in the "value" slot. */

/* 00 is "none" obviously */

#define SQ905_BULK_READ	0x03	/* precedes any bulk read */
#define SQ905_COMMAND	0x06	/* precedes the command codes below */
#define SQ905_PING	0x07	/* when reading an "idling" command */
#define SQ905_READ_DONE 0xc0    /* ack bulk read completed */

/* Any non-zero value in the bottom 2 bits of the 2nd byte of
 * the ID appears to indicate the camera can do 640*480. If the
 * LSB of that byte is set the image is just upside down, otherwise
 * it is rotated 180 degrees. */
#define SQ905_HIRES_MASK	0x00000300
#define SQ905_ORIENTATION_MASK	0x00000100

/* Some command codes. These go in the "index" slot. */

#define SQ905_ID      0xf0	/* asks for model string */
#define SQ905_CONFIG  0x20	/* gets photo alloc. table, not used here */
#define SQ905_DATA    0x30	/* accesses photo data, not used here */
#define SQ905_CLEAR   0xa0	/* clear everything */
#define SQ905_CAPTURE_LOW  0x60	/* Starts capture at 160x120 */
#define SQ905_CAPTURE_MED  0x61	/* Starts capture at 320x240 */
#define SQ905_CAPTURE_HIGH 0x62	/* Starts capture at 640x480 (some cams only) */
/* note that the capture command also controls the output dimensions */

/* Structure to hold all of our device specific stuff */
struct sd {
	struct gspca_dev gspca_dev;	/* !! must be the first item */

	/*
	 * Driver stuff
	 */
	struct work_struct work_struct;
	struct workqueue_struct *work_thread;
};

static struct v4l2_pix_format sq905_mode[] = {
	{ 160, 120, V4L2_PIX_FMT_SBGGR8, V4L2_FIELD_NONE,
		.bytesperline = 160,
		.sizeimage = 160 * 120,
		.colorspace = V4L2_COLORSPACE_SRGB,
		.priv = 0},
	{ 320, 240, V4L2_PIX_FMT_SBGGR8, V4L2_FIELD_NONE,
		.bytesperline = 320,
		.sizeimage = 320 * 240,
		.colorspace = V4L2_COLORSPACE_SRGB,
		.priv = 0},
	{ 640, 480, V4L2_PIX_FMT_SBGGR8, V4L2_FIELD_NONE,
		.bytesperline = 640,
		.sizeimage = 640 * 480,
		.colorspace = V4L2_COLORSPACE_SRGB,
		.priv = 0}
};

/*
 * Send a command to the camera.
 */
static int sq905_command(struct gspca_dev *gspca_dev, u16 index)
{
	int ret;

	gspca_dev->usb_buf[0] = '\0';
	ret = usb_control_msg(gspca_dev->dev,
			      usb_sndctrlpipe(gspca_dev->dev, 0),
			      USB_REQ_SYNCH_FRAME,                /* request */
			      USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
			      SQ905_COMMAND, index, gspca_dev->usb_buf, 1,
			      SQ905_CMD_TIMEOUT);
	if (ret < 0) {
		pr_err("%s: usb_control_msg failed (%d)\n", __func__, ret);
		return ret;
	}

	ret = usb_control_msg(gspca_dev->dev,
			      usb_sndctrlpipe(gspca_dev->dev, 0),
			      USB_REQ_SYNCH_FRAME,                /* request */
			      USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
			      SQ905_PING, 0, gspca_dev->usb_buf, 1,
			      SQ905_CMD_TIMEOUT);
	if (ret < 0) {
		pr_err("%s: usb_control_msg failed 2 (%d)\n", __func__, ret);
		return ret;
	}

	return 0;
}

/*
 * Acknowledge the end of a frame - see warning on sq905_command.
 */
static int sq905_ack_frame(struct gspca_dev *gspca_dev)
{
	int ret;

	gspca_dev->usb_buf[0] = '\0';
	ret = usb_control_msg(gspca_dev->dev,
			      usb_sndctrlpipe(gspca_dev->dev, 0),
			      USB_REQ_SYNCH_FRAME,                /* request */
			      USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
			      SQ905_READ_DONE, 0, gspca_dev->usb_buf, 1,
			      SQ905_CMD_TIMEOUT);
	if (ret < 0) {
		pr_err("%s: usb_control_msg failed (%d)\n", __func__, ret);
		return ret;
	}

	return 0;
}

/*
 *  request and read a block of data - see warning on sq905_command.
 */
static int
sq905_read_data(struct gspca_dev *gspca_dev, u8 *data, int size, int need_lock)
{
	int ret;
	int act_len;

	gspca_dev->usb_buf[0] = '\0';
	if (need_lock)
		mutex_lock(&gspca_dev->usb_lock);
	ret = usb_control_msg(gspca_dev->dev,
			      usb_sndctrlpipe(gspca_dev->dev, 0),
			      USB_REQ_SYNCH_FRAME,                /* request */
			      USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
			      SQ905_BULK_READ, size, gspca_dev->usb_buf,
			      1, SQ905_CMD_TIMEOUT);
	if (need_lock)
		mutex_unlock(&gspca_dev->usb_lock);
	if (ret < 0) {
		pr_err("%s: usb_control_msg failed (%d)\n", __func__, ret);
		return ret;
	}
	ret = usb_bulk_msg(gspca_dev->dev,
			   usb_rcvbulkpipe(gspca_dev->dev, 0x81),
			   data, size, &act_len, SQ905_DATA_TIMEOUT);

	/* successful, it returns 0, otherwise  negative */
	if (ret < 0 || act_len != size) {
		pr_err("bulk read fail (%d) len %d/%d\n", ret, act_len, size);
		return -EIO;
	}
	return 0;
}

/*
 * This function is called as a workqueue function and runs whenever the camera
 * is streaming data. Because it is a workqueue function it is allowed to sleep
 * so we can use synchronous USB calls. To avoid possible collisions with other
 * threads attempting to use gspca_dev->usb_buf we take the usb_lock when
 * performing USB operations using it. In practice we don't really need this
 * as the camera doesn't provide any controls.
 */
static void sq905_dostream(struct work_struct *work)
{
	struct sd *dev = container_of(work, struct sd, work_struct);
	struct gspca_dev *gspca_dev = &dev->gspca_dev;
	int bytes_left; /* bytes remaining in current frame. */
	int data_len;   /* size to use for the next read. */
	int header_read; /* true if we have already read the frame header. */
	int packet_type;
	int frame_sz;
	int ret;
	u8 *data;
	u8 *buffer;

	buffer = kmalloc(SQ905_MAX_TRANSFER, GFP_KERNEL);
	if (!buffer) {
		pr_err("Couldn't allocate USB buffer\n");
		goto quit_stream;
	}

	frame_sz = gspca_dev->cam.cam_mode[gspca_dev->curr_mode].sizeimage
			+ FRAME_HEADER_LEN;

	while (gspca_dev->present && gspca_dev->streaming) {
#ifdef CONFIG_PM
		if (gspca_dev->frozen)
			break;
#endif
		/* request some data and then read it until we have
		 * a complete frame. */
		bytes_left = frame_sz;
		header_read = 0;

		/* Note we do not check for gspca_dev->streaming here, as
		   we must finish reading an entire frame, otherwise the
		   next time we stream we start reading in the middle of a
		   frame. */
		while (bytes_left > 0 && gspca_dev->present) {
			data_len = bytes_left > SQ905_MAX_TRANSFER ?
				SQ905_MAX_TRANSFER : bytes_left;
			ret = sq905_read_data(gspca_dev, buffer, data_len, 1);
			if (ret < 0)
				goto quit_stream;
			gspca_dbg(gspca_dev, D_PACK,
				  "Got %d bytes out of %d for frame\n",
				  data_len, bytes_left);
			bytes_left -= data_len;
			data = buffer;
			if (!header_read) {
				packet_type = FIRST_PACKET;
				/* The first 64 bytes of each frame are
				 * a header full of FF 00 bytes */
				data += FRAME_HEADER_LEN;
				data_len -= FRAME_HEADER_LEN;
				header_read = 1;
			} else if (bytes_left == 0) {
				packet_type = LAST_PACKET;
			} else {
				packet_type = INTER_PACKET;
			}
			gspca_frame_add(gspca_dev, packet_type,
					data, data_len);
			/* If entire frame fits in one packet we still
			   need to add a LAST_PACKET */
			if (packet_type == FIRST_PACKET &&
			    bytes_left == 0)
				gspca_frame_add(gspca_dev, LAST_PACKET,
						NULL, 0);
		}
		if (gspca_dev->present) {
			/* acknowledge the frame */
			mutex_lock(&gspca_dev->usb_lock);
			ret = sq905_ack_frame(gspca_dev);
			mutex_unlock(&gspca_dev->usb_lock);
			if (ret < 0)
				goto quit_stream;
		}
	}
quit_stream:
	if (gspca_dev->present) {
		mutex_lock(&gspca_dev->usb_lock);
		sq905_command(gspca_dev, SQ905_CLEAR);
		mutex_unlock(&gspca_dev->usb_lock);
	}
	kfree(buffer);
}

/* This function is called at probe time just before sd_init */
static int sd_config(struct gspca_dev *gspca_dev,
		const struct usb_device_id *id)
{
	struct cam *cam = &gspca_dev->cam;
	struct sd *dev = (struct sd *) gspca_dev;

	/* We don't use the buffer gspca allocates so make it small. */
	cam->bulk = 1;
	cam->bulk_size = 64;

	INIT_WORK(&dev->work_struct, sq905_dostream);

	return 0;
}

/* called on streamoff with alt==0 and on disconnect */
/* the usb_lock is held at entry - restore on exit */
static void sd_stop0(struct gspca_dev *gspca_dev)
{
	struct sd *dev = (struct sd *) gspca_dev;

	/* wait for the work queue to terminate */
	mutex_unlock(&gspca_dev->usb_lock);
	/* This waits for sq905_dostream to finish */
	destroy_workqueue(dev->work_thread);
	dev->work_thread = NULL;
	mutex_lock(&gspca_dev->usb_lock);
}

/* this function is called at probe and resume time */
static int sd_init(struct gspca_dev *gspca_dev)
{
	u32 ident;
	int ret;

	/* connect to the camera and read
	 * the model ID and process that and put it away.
	 */
	ret = sq905_command(gspca_dev, SQ905_CLEAR);
	if (ret < 0)
		return ret;
	ret = sq905_command(gspca_dev, SQ905_ID);
	if (ret < 0)
		return ret;
	ret = sq905_read_data(gspca_dev, gspca_dev->usb_buf, 4, 0);
	if (ret < 0)
		return ret;
	/* usb_buf is allocated with kmalloc so is aligned.
	 * Camera model number is the right way round if we assume this
	 * reverse engineered ID is supposed to be big endian. */
	ident = be32_to_cpup((__be32 *)gspca_dev->usb_buf);
	ret = sq905_command(gspca_dev, SQ905_CLEAR);
	if (ret < 0)
		return ret;
	gspca_dbg(gspca_dev, D_CONF, "SQ905 camera ID %08x detected\n", ident);
	gspca_dev->cam.cam_mode = sq905_mode;
	gspca_dev->cam.nmodes = ARRAY_SIZE(sq905_mode);
	if (!(ident & SQ905_HIRES_MASK))
		gspca_dev->cam.nmodes--;

	if (ident & SQ905_ORIENTATION_MASK)
		gspca_dev->cam.input_flags = V4L2_IN_ST_VFLIP;
	else
		gspca_dev->cam.input_flags = V4L2_IN_ST_VFLIP |
					     V4L2_IN_ST_HFLIP;
	return 0;
}

/* Set up for getting frames. */
static int sd_start(struct gspca_dev *gspca_dev)
{
	struct sd *dev = (struct sd *) gspca_dev;
	int ret;

	/* "Open the shutter" and set size, to start capture */
	switch (gspca_dev->curr_mode) {
	default:
/*	case 2: */
		gspca_dbg(gspca_dev, D_STREAM, "Start streaming at high resolution\n");
		ret = sq905_command(&dev->gspca_dev, SQ905_CAPTURE_HIGH);
		break;
	case 1:
		gspca_dbg(gspca_dev, D_STREAM, "Start streaming at medium resolution\n");
		ret = sq905_command(&dev->gspca_dev, SQ905_CAPTURE_MED);
		break;
	case 0:
		gspca_dbg(gspca_dev, D_STREAM, "Start streaming at low resolution\n");
		ret = sq905_command(&dev->gspca_dev, SQ905_CAPTURE_LOW);
	}

	if (ret < 0) {
		gspca_err(gspca_dev, "Start streaming command failed\n");
		return ret;
	}
	/* Start the workqueue function to do the streaming */
	dev->work_thread = create_singlethread_workqueue(MODULE_NAME);
	queue_work(dev->work_thread, &dev->work_struct);

	return 0;
}

/* Table of supported USB devices */
static const struct usb_device_id device_table[] = {
	{USB_DEVICE(0x2770, 0x9120)},
	{}
};

MODULE_DEVICE_TABLE(usb, device_table);

/* sub-driver description */
static const struct sd_desc sd_desc = {
	.name   = MODULE_NAME,
	.config = sd_config,
	.init   = sd_init,
	.start  = sd_start,
	.stop0  = sd_stop0,
};

/* -- device connect -- */
static int sd_probe(struct usb_interface *intf,
		const struct usb_device_id *id)
{
	return gspca_dev_probe(intf, id,
			&sd_desc,
			sizeof(struct sd),
			THIS_MODULE);
}

static struct usb_driver sd_driver = {
	.name       = MODULE_NAME,
	.id_table   = device_table,
	.probe      = sd_probe,
	.disconnect = gspca_disconnect,
#ifdef CONFIG_PM
	.suspend = gspca_suspend,
	.resume  = gspca_resume,
	.reset_resume = gspca_resume,
#endif
};

module_usb_driver(sd_driver);