summaryrefslogtreecommitdiff
path: root/drivers/media/usb/gspca/vicam.c
blob: 554b90ef2200bf928686e83bec938d8d4f6588a1 (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
/*
 * gspca ViCam subdriver
 *
 * Copyright (C) 2011 Hans de Goede <hdegoede@redhat.com>
 *
 * Based on the usbvideo vicam driver, which is:
 *
 * Copyright (c) 2002 Joe Burks (jburks@wavicle.org),
 *                    Chris Cheney (chris.cheney@gmail.com),
 *                    Pavel Machek (pavel@ucw.cz),
 *                    John Tyner (jtyner@cs.ucr.edu),
 *                    Monroe Williams (monroe@pobox.com)
 *
 * 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.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#define MODULE_NAME "vicam"
#define HEADER_SIZE 64

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

#define VICAM_FIRMWARE "vicam/firmware.fw"

MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
MODULE_DESCRIPTION("GSPCA ViCam USB Camera Driver");
MODULE_LICENSE("GPL");
MODULE_FIRMWARE(VICAM_FIRMWARE);

struct sd {
	struct gspca_dev gspca_dev;	/* !! must be the first item */
	struct work_struct work_struct;
};

/* The vicam sensor has a resolution of 512 x 244, with I believe square
   pixels, but this is forced to a 4:3 ratio by optics. So it has
   non square pixels :( */
static struct v4l2_pix_format vicam_mode[] = {
	{ 256, 122, V4L2_PIX_FMT_SGRBG8, V4L2_FIELD_NONE,
		.bytesperline = 256,
		.sizeimage = 256 * 122,
		.colorspace = V4L2_COLORSPACE_SRGB,},
	/* 2 modes with somewhat more square pixels */
	{ 256, 200, V4L2_PIX_FMT_SGRBG8, V4L2_FIELD_NONE,
		.bytesperline = 256,
		.sizeimage = 256 * 200,
		.colorspace = V4L2_COLORSPACE_SRGB,},
	{ 256, 240, V4L2_PIX_FMT_SGRBG8, V4L2_FIELD_NONE,
		.bytesperline = 256,
		.sizeimage = 256 * 240,
		.colorspace = V4L2_COLORSPACE_SRGB,},
#if 0   /* This mode has extremely non square pixels, testing use only */
	{ 512, 122, V4L2_PIX_FMT_SGRBG8, V4L2_FIELD_NONE,
		.bytesperline = 512,
		.sizeimage = 512 * 122,
		.colorspace = V4L2_COLORSPACE_SRGB,},
#endif
	{ 512, 244, V4L2_PIX_FMT_SGRBG8, V4L2_FIELD_NONE,
		.bytesperline = 512,
		.sizeimage = 512 * 244,
		.colorspace = V4L2_COLORSPACE_SRGB,},
};

static int vicam_control_msg(struct gspca_dev *gspca_dev, u8 request,
	u16 value, u16 index, u8 *data, u16 len)
{
	int ret;

	ret = usb_control_msg(gspca_dev->dev,
			      usb_sndctrlpipe(gspca_dev->dev, 0),
			      request,
			      USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
			      value, index, data, len, 1000);
	if (ret < 0)
		pr_err("control msg req %02X error %d\n", request, ret);

	return ret;
}

static int vicam_set_camera_power(struct gspca_dev *gspca_dev, int state)
{
	int ret;

	ret = vicam_control_msg(gspca_dev, 0x50, state, 0, NULL, 0);
	if (ret < 0)
		return ret;

	if (state)
		ret = vicam_control_msg(gspca_dev, 0x55, 1, 0, NULL, 0);

	return ret;
}

/*
 *  request and read a block of data
 */
static int vicam_read_frame(struct gspca_dev *gspca_dev, u8 *data, int size)
{
	int ret, unscaled_height, act_len = 0;
	u8 *req_data = gspca_dev->usb_buf;
	s32 expo = v4l2_ctrl_g_ctrl(gspca_dev->exposure);
	s32 gain = v4l2_ctrl_g_ctrl(gspca_dev->gain);

	memset(req_data, 0, 16);
	req_data[0] = gain;
	if (gspca_dev->pixfmt.width == 256)
		req_data[1] |= 0x01; /* low nibble x-scale */
	if (gspca_dev->pixfmt.height <= 122) {
		req_data[1] |= 0x10; /* high nibble y-scale */
		unscaled_height = gspca_dev->pixfmt.height * 2;
	} else
		unscaled_height = gspca_dev->pixfmt.height;
	req_data[2] = 0x90; /* unknown, does not seem to do anything */
	if (unscaled_height <= 200)
		req_data[3] = 0x06; /* vend? */
	else if (unscaled_height <= 242) /* Yes 242 not 240 */
		req_data[3] = 0x07; /* vend? */
	else /* Up to 244 lines with req_data[3] == 0x08 */
		req_data[3] = 0x08; /* vend? */

	if (expo < 256) {
		/* Frame rate maxed out, use partial frame expo time */
		req_data[4] = 255 - expo;
		req_data[5] = 0x00;
		req_data[6] = 0x00;
		req_data[7] = 0x01;
	} else {
		/* Modify frame rate */
		req_data[4] = 0x00;
		req_data[5] = 0x00;
		req_data[6] = expo & 0xFF;
		req_data[7] = expo >> 8;
	}
	req_data[8] = ((244 - unscaled_height) / 2) & ~0x01; /* vstart */
	/* bytes 9-15 do not seem to affect exposure or image quality */

	mutex_lock(&gspca_dev->usb_lock);
	ret = vicam_control_msg(gspca_dev, 0x51, 0x80, 0, req_data, 16);
	mutex_unlock(&gspca_dev->usb_lock);
	if (ret < 0)
		return ret;

	ret = usb_bulk_msg(gspca_dev->dev,
			   usb_rcvbulkpipe(gspca_dev->dev, 0x81),
			   data, size, &act_len, 10000);
	/* 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 cameras controls are only written from the workqueue.
 */
static void vicam_dostream(struct work_struct *work)
{
	struct sd *sd = container_of(work, struct sd, work_struct);
	struct gspca_dev *gspca_dev = &sd->gspca_dev;
	int ret, frame_sz;
	u8 *buffer;

	frame_sz = gspca_dev->cam.cam_mode[gspca_dev->curr_mode].sizeimage +
		   HEADER_SIZE;
	buffer = kmalloc(frame_sz, GFP_KERNEL | GFP_DMA);
	if (!buffer) {
		pr_err("Couldn't allocate USB buffer\n");
		goto exit;
	}

	while (gspca_dev->present && gspca_dev->streaming) {
#ifdef CONFIG_PM
		if (gspca_dev->frozen)
			break;
#endif
		ret = vicam_read_frame(gspca_dev, buffer, frame_sz);
		if (ret < 0)
			break;

		/* Note the frame header contents seem to be completely
		   constant, they do not change with either image, or
		   settings. So we simply discard it. The frames have
		   a very similar 64 byte footer, which we don't even
		   bother reading from the cam */
		gspca_frame_add(gspca_dev, FIRST_PACKET,
				buffer + HEADER_SIZE,
				frame_sz - HEADER_SIZE);
		gspca_frame_add(gspca_dev, LAST_PACKET, NULL, 0);
	}
exit:
	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 *sd = (struct sd *)gspca_dev;

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

	INIT_WORK(&sd->work_struct, vicam_dostream);

	return 0;
}

/* this function is called at probe and resume time */
static int sd_init(struct gspca_dev *gspca_dev)
{
	int ret;
	const struct ihex_binrec *rec;
	const struct firmware *uninitialized_var(fw);
	u8 *firmware_buf;

	ret = request_ihex_firmware(&fw, VICAM_FIRMWARE,
				    &gspca_dev->dev->dev);
	if (ret) {
		pr_err("Failed to load \"vicam/firmware.fw\": %d\n", ret);
		return ret;
	}

	firmware_buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
	if (!firmware_buf) {
		ret = -ENOMEM;
		goto exit;
	}
	for (rec = (void *)fw->data; rec; rec = ihex_next_binrec(rec)) {
		memcpy(firmware_buf, rec->data, be16_to_cpu(rec->len));
		ret = vicam_control_msg(gspca_dev, 0xff, 0, 0, firmware_buf,
					be16_to_cpu(rec->len));
		if (ret < 0)
			break;
	}

	kfree(firmware_buf);
exit:
	release_firmware(fw);
	return ret;
}

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

	ret = vicam_set_camera_power(gspca_dev, 1);
	if (ret < 0)
		return ret;

	schedule_work(&sd->work_struct);

	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 vicam_dostream to finish */
	flush_work(&dev->work_struct);
	mutex_lock(&gspca_dev->usb_lock);

	if (gspca_dev->present)
		vicam_set_camera_power(gspca_dev, 0);
}

static int sd_init_controls(struct gspca_dev *gspca_dev)
{
	struct v4l2_ctrl_handler *hdl = &gspca_dev->ctrl_handler;

	gspca_dev->vdev.ctrl_handler = hdl;
	v4l2_ctrl_handler_init(hdl, 2);
	gspca_dev->exposure = v4l2_ctrl_new_std(hdl, NULL,
			V4L2_CID_EXPOSURE, 0, 2047, 1, 256);
	gspca_dev->gain = v4l2_ctrl_new_std(hdl, NULL,
			V4L2_CID_GAIN, 0, 255, 1, 200);

	if (hdl->error) {
		pr_err("Could not initialize controls\n");
		return hdl->error;
	}
	return 0;
}

/* Table of supported USB devices */
static const struct usb_device_id device_table[] = {
	{USB_DEVICE(0x04c1, 0x009d)},
	{USB_DEVICE(0x0602, 0x1001)},
	{}
};

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,
	.init_controls = sd_init_controls,
	.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);