summaryrefslogtreecommitdiffstats
path: root/drivers/media/video/gspca/sq905c.c
blob: ae783634712f4196a4751fe678d5370e65b5e2a0 (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
/*
 * SQ905C subdriver
 *
 * Copyright (C) 2009 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

/*
 *
 * This driver uses work done in
 * libgphoto2/camlibs/digigr8, Copyright (C) Theodore Kilgore.
 *
 * This driver has also used as a base the sq905c driver
 * and may contain code fragments from it.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#define MODULE_NAME "sq905c"

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

MODULE_AUTHOR("Theodore Kilgore <kilgota@auburn.edu>");
MODULE_DESCRIPTION("GSPCA/SQ905C USB Camera Driver");
MODULE_LICENSE("GPL");

/* Default timeouts, in ms */
#define SQ905C_CMD_TIMEOUT 500
#define SQ905C_DATA_TIMEOUT 1000

/* Maximum transfer size to use. */
#define SQ905C_MAX_TRANSFER 0x8000

#define FRAME_HEADER_LEN 0x50

/* Commands. These go in the "value" slot. */
#define SQ905C_CLEAR   0xa0		/* clear everything */
#define SQ905C_GET_ID  0x14f4		/* Read version number */
#define SQ905C_CAPTURE_LOW 0xa040	/* Starts capture at 160x120 */
#define SQ905C_CAPTURE_MED 0x1440	/* Starts capture at 320x240 */
#define SQ905C_CAPTURE_HI 0x2840	/* Starts capture at 320x240 */

/* For capture, this must go in the "index" slot. */
#define SQ905C_CAPTURE_INDEX 0x110f

/* Structure to hold all of our device specific stuff */
struct sd {
	struct gspca_dev gspca_dev;	/* !! must be the first item */
	const struct v4l2_pix_format *cap_mode;
	/* Driver stuff */
	struct work_struct work_struct;
	struct workqueue_struct *work_thread;
};

/*
 * Most of these cameras will do 640x480 and 320x240. 160x120 works
 * in theory but gives very poor output. Therefore, not supported.
 * The 0x2770:0x9050 cameras have max resolution of 320x240.
 */
static struct v4l2_pix_format sq905c_mode[] = {
	{ 320, 240, V4L2_PIX_FMT_SQ905C, V4L2_FIELD_NONE,
		.bytesperline = 320,
		.sizeimage = 320 * 240,
		.colorspace = V4L2_COLORSPACE_SRGB,
		.priv = 0},
	{ 640, 480, V4L2_PIX_FMT_SQ905C, V4L2_FIELD_NONE,
		.bytesperline = 640,
		.sizeimage = 640 * 480,
		.colorspace = V4L2_COLORSPACE_SRGB,
		.priv = 0}
};

/* Send a command to the camera. */
static int sq905c_command(struct gspca_dev *gspca_dev, u16 command, u16 index)
{
	int ret;

	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,
			      command, index, NULL, 0,
			      SQ905C_CMD_TIMEOUT);
	if (ret < 0) {
		pr_err("%s: usb_control_msg failed (%d)\n", __func__, ret);
		return ret;
	}

	return 0;
}

static int sq905c_read(struct gspca_dev *gspca_dev, u16 command, u16 index,
		       int size)
{
	int ret;

	ret = usb_control_msg(gspca_dev->dev,
			      usb_rcvctrlpipe(gspca_dev->dev, 0),
			      USB_REQ_SYNCH_FRAME,		/* request */
			      USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
			      command, index, gspca_dev->usb_buf, size,
			      SQ905C_CMD_TIMEOUT);
	if (ret < 0) {
		pr_err("%s: usb_control_msg failed (%d)\n", __func__, ret);
		return ret;
	}

	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 the camera's USB interface the gspca usb_lock is
 * used when performing the one USB control operation inside the workqueue,
 * which tells the camera to close the stream. In practice the only thing
 * which needs to be protected against is the usb_set_interface call that
 * gspca makes during stream_off. Otherwise the camera doesn't provide any
 * controls that the user could try to change.
 */
static void sq905c_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 act_len;
	int packet_type;
	int ret;
	u8 *buffer;

	buffer = kmalloc(SQ905C_MAX_TRANSFER, GFP_KERNEL | GFP_DMA);
	if (!buffer) {
		pr_err("Couldn't allocate USB buffer\n");
		goto quit_stream;
	}

	while (gspca_dev->present && gspca_dev->streaming) {
		/* Request the header, which tells the size to download */
		ret = usb_bulk_msg(gspca_dev->dev,
				usb_rcvbulkpipe(gspca_dev->dev, 0x81),
				buffer, FRAME_HEADER_LEN, &act_len,
				SQ905C_DATA_TIMEOUT);
		PDEBUG(D_STREAM,
			"Got %d bytes out of %d for header",
			act_len, FRAME_HEADER_LEN);
		if (ret < 0 || act_len < FRAME_HEADER_LEN)
			goto quit_stream;
		/* size is read from 4 bytes starting 0x40, little endian */
		bytes_left = buffer[0x40]|(buffer[0x41]<<8)|(buffer[0x42]<<16)
					|(buffer[0x43]<<24);
		PDEBUG(D_STREAM, "bytes_left = 0x%x", bytes_left);
		/* We keep the header. It has other information, too. */
		packet_type = FIRST_PACKET;
		gspca_frame_add(gspca_dev, packet_type,
				buffer, FRAME_HEADER_LEN);
		while (bytes_left > 0 && gspca_dev->present) {
			data_len = bytes_left > SQ905C_MAX_TRANSFER ?
				SQ905C_MAX_TRANSFER : bytes_left;
			ret = usb_bulk_msg(gspca_dev->dev,
				usb_rcvbulkpipe(gspca_dev->dev, 0x81),
				buffer, data_len, &act_len,
				SQ905C_DATA_TIMEOUT);
			if (ret < 0 || act_len < data_len)
				goto quit_stream;
			PDEBUG(D_STREAM,
				"Got %d bytes out of %d for frame",
				data_len, bytes_left);
			bytes_left -= data_len;
			if (bytes_left == 0)
				packet_type = LAST_PACKET;
			else
				packet_type = INTER_PACKET;
			gspca_frame_add(gspca_dev, packet_type,
					buffer, data_len);
		}
	}
quit_stream:
	if (gspca_dev->present) {
		mutex_lock(&gspca_dev->usb_lock);
		sq905c_command(gspca_dev, SQ905C_CLEAR, 0);
		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;
	int ret;

	PDEBUG(D_PROBE,
		"SQ9050 camera detected"
		" (vid/pid 0x%04X:0x%04X)", id->idVendor, id->idProduct);

	ret = sq905c_command(gspca_dev, SQ905C_GET_ID, 0);
	if (ret < 0) {
		PDEBUG(D_ERR, "Get version command failed");
		return ret;
	}

	ret = sq905c_read(gspca_dev, 0xf5, 0, 20);
	if (ret < 0) {
		PDEBUG(D_ERR, "Reading version command failed");
		return ret;
	}
	/* Note we leave out the usb id and the manufacturing date */
	PDEBUG(D_PROBE,
	       "SQ9050 ID string: %02x - %02x %02x %02x %02x %02x %02x",
		gspca_dev->usb_buf[3],
		gspca_dev->usb_buf[14], gspca_dev->usb_buf[15],
		gspca_dev->usb_buf[16], gspca_dev->usb_buf[17],
		gspca_dev->usb_buf[18], gspca_dev->usb_buf[19]);

	cam->cam_mode = sq905c_mode;
	cam->nmodes = 2;
	if (gspca_dev->usb_buf[15] == 0)
		cam->nmodes = 1;
	/* We don't use the buffer gspca allocates so make it small. */
	cam->bulk_size = 32;
	cam->bulk = 1;
	INIT_WORK(&dev->work_struct, sq905c_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 sq905c_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)
{
	int ret;

	/* connect to the camera and reset it. */
	ret = sq905c_command(gspca_dev, SQ905C_CLEAR, 0);
	return ret;
}

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

	dev->cap_mode = gspca_dev->cam.cam_mode;
	/* "Open the shutter" and set size, to start capture */
	switch (gspca_dev->width) {
	case 640:
		PDEBUG(D_STREAM, "Start streaming at high resolution");
		dev->cap_mode++;
		ret = sq905c_command(gspca_dev, SQ905C_CAPTURE_HI,
						SQ905C_CAPTURE_INDEX);
		break;
	default: /* 320 */
	PDEBUG(D_STREAM, "Start streaming at medium resolution");
		ret = sq905c_command(gspca_dev, SQ905C_CAPTURE_MED,
						SQ905C_CAPTURE_INDEX);
	}

	if (ret < 0) {
		PDEBUG(D_ERR, "Start streaming command failed");
		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, 0x905c)},
	{USB_DEVICE(0x2770, 0x9050)},
	{USB_DEVICE(0x2770, 0x9051)},
	{USB_DEVICE(0x2770, 0x9052)},
	{USB_DEVICE(0x2770, 0x913d)},
	{}
};

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,
#endif
};

module_usb_driver(sd_driver);