summaryrefslogtreecommitdiff
path: root/drivers/media/video/ovcamchip/ov6x20.c
blob: b3f4d266cedead6f1afd053ec0b4e2edd117b88e (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
/* OmniVision OV6620/OV6120 Camera Chip Support Code
 *
 * Copyright (c) 1999-2004 Mark McClelland <mark@alpha.dyndns.org>
 * http://alpha.dyndns.org/ov511/
 *
 * 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 (at your
 * option) any later version. NO WARRANTY OF ANY KIND is expressed or implied.
 */

#define DEBUG

#include <linux/slab.h>
#include "ovcamchip_priv.h"

/* Registers */
#define REG_GAIN		0x00	/* gain [5:0] */
#define REG_BLUE		0x01	/* blue gain */
#define REG_RED			0x02	/* red gain */
#define REG_SAT			0x03	/* saturation */
#define REG_CNT			0x05	/* Y contrast */
#define REG_BRT			0x06	/* Y brightness */
#define REG_WB_BLUE		0x0C	/* WB blue ratio [5:0] */
#define REG_WB_RED		0x0D	/* WB red ratio [5:0] */
#define REG_EXP			0x10	/* exposure */

/* Window parameters */
#define HWSBASE 0x38
#define HWEBASE 0x3A
#define VWSBASE 0x05
#define VWEBASE 0x06

struct ov6x20 {
	int auto_brt;
	int auto_exp;
	int backlight;
	int bandfilt;
	int mirror;
};

/* Initial values for use with OV511/OV511+ cameras */
static struct ovcamchip_regvals regvals_init_6x20_511[] = {
	{ 0x12, 0x80 }, /* reset */
	{ 0x11, 0x01 },
	{ 0x03, 0x60 },
	{ 0x05, 0x7f }, /* For when autoadjust is off */
	{ 0x07, 0xa8 },
	{ 0x0c, 0x24 },
	{ 0x0d, 0x24 },
	{ 0x0f, 0x15 }, /* COMS */
	{ 0x10, 0x75 }, /* AEC Exposure time */
	{ 0x12, 0x24 }, /* Enable AGC and AWB */
	{ 0x14, 0x04 },
	{ 0x16, 0x03 },
	{ 0x26, 0xb2 }, /* BLC enable */
	/* 0x28: 0x05 Selects RGB format if RGB on */
	{ 0x28, 0x05 },
	{ 0x2a, 0x04 }, /* Disable framerate adjust */
	{ 0x2d, 0x99 },
	{ 0x33, 0xa0 }, /* Color Processing Parameter */
	{ 0x34, 0xd2 }, /* Max A/D range */
	{ 0x38, 0x8b },
	{ 0x39, 0x40 },

	{ 0x3c, 0x39 }, /* Enable AEC mode changing */
	{ 0x3c, 0x3c }, /* Change AEC mode */
	{ 0x3c, 0x24 }, /* Disable AEC mode changing */

	{ 0x3d, 0x80 },
	/* These next two registers (0x4a, 0x4b) are undocumented. They
	 * control the color balance */
	{ 0x4a, 0x80 },
	{ 0x4b, 0x80 },
	{ 0x4d, 0xd2 }, /* This reduces noise a bit */
	{ 0x4e, 0xc1 },
	{ 0x4f, 0x04 },
	{ 0xff, 0xff },	/* END MARKER */
};

/* Initial values for use with OV518 cameras */
static struct ovcamchip_regvals regvals_init_6x20_518[] = {
	{ 0x12, 0x80 }, /* Do a reset */
	{ 0x03, 0xc0 }, /* Saturation */
	{ 0x05, 0x8a }, /* Contrast */
	{ 0x0c, 0x24 }, /* AWB blue */
	{ 0x0d, 0x24 }, /* AWB red */
	{ 0x0e, 0x8d }, /* Additional 2x gain */
	{ 0x0f, 0x25 }, /* Black expanding level = 1.3V */
	{ 0x11, 0x01 }, /* Clock div. */
	{ 0x12, 0x24 }, /* Enable AGC and AWB */
	{ 0x13, 0x01 }, /* (default) */
	{ 0x14, 0x80 }, /* Set reserved bit 7 */
	{ 0x15, 0x01 }, /* (default) */
	{ 0x16, 0x03 }, /* (default) */
	{ 0x17, 0x38 }, /* (default) */
	{ 0x18, 0xea }, /* (default) */
	{ 0x19, 0x04 },
	{ 0x1a, 0x93 },
	{ 0x1b, 0x00 }, /* (default) */
	{ 0x1e, 0xc4 }, /* (default) */
	{ 0x1f, 0x04 }, /* (default) */
	{ 0x20, 0x20 }, /* Enable 1st stage aperture correction */
	{ 0x21, 0x10 }, /* Y offset */
	{ 0x22, 0x88 }, /* U offset */
	{ 0x23, 0xc0 }, /* Set XTAL power level */
	{ 0x24, 0x53 }, /* AEC bright ratio */
	{ 0x25, 0x7a }, /* AEC black ratio */
	{ 0x26, 0xb2 }, /* BLC enable */
	{ 0x27, 0xa2 }, /* Full output range */
	{ 0x28, 0x01 }, /* (default) */
	{ 0x29, 0x00 }, /* (default) */
	{ 0x2a, 0x84 }, /* (default) */
	{ 0x2b, 0xa8 }, /* Set custom frame rate */
	{ 0x2c, 0xa0 }, /* (reserved) */
	{ 0x2d, 0x95 }, /* Enable banding filter */
	{ 0x2e, 0x88 }, /* V offset */
	{ 0x33, 0x22 }, /* Luminance gamma on */
	{ 0x34, 0xc7 }, /* A/D bias */
	{ 0x36, 0x12 }, /* (reserved) */
	{ 0x37, 0x63 }, /* (reserved) */
	{ 0x38, 0x8b }, /* Quick AEC/AEB */
	{ 0x39, 0x00 }, /* (default) */
	{ 0x3a, 0x0f }, /* (default) */
	{ 0x3b, 0x3c }, /* (default) */
	{ 0x3c, 0x5c }, /* AEC controls */
	{ 0x3d, 0x80 }, /* Drop 1 (bad) frame when AEC change */
	{ 0x3e, 0x80 }, /* (default) */
	{ 0x3f, 0x02 }, /* (default) */
	{ 0x40, 0x10 }, /* (reserved) */
	{ 0x41, 0x10 }, /* (reserved) */
	{ 0x42, 0x00 }, /* (reserved) */
	{ 0x43, 0x7f }, /* (reserved) */
	{ 0x44, 0x80 }, /* (reserved) */
	{ 0x45, 0x1c }, /* (reserved) */
	{ 0x46, 0x1c }, /* (reserved) */
	{ 0x47, 0x80 }, /* (reserved) */
	{ 0x48, 0x5f }, /* (reserved) */
	{ 0x49, 0x00 }, /* (reserved) */
	{ 0x4a, 0x00 }, /* Color balance (undocumented) */
	{ 0x4b, 0x80 }, /* Color balance (undocumented) */
	{ 0x4c, 0x58 }, /* (reserved) */
	{ 0x4d, 0xd2 }, /* U *= .938, V *= .838 */
	{ 0x4e, 0xa0 }, /* (default) */
	{ 0x4f, 0x04 }, /* UV 3-point average */
	{ 0x50, 0xff }, /* (reserved) */
	{ 0x51, 0x58 }, /* (reserved) */
	{ 0x52, 0xc0 }, /* (reserved) */
	{ 0x53, 0x42 }, /* (reserved) */
	{ 0x27, 0xa6 }, /* Enable manual offset adj. (reg 21 & 22) */
	{ 0x12, 0x20 },
	{ 0x12, 0x24 },

	{ 0xff, 0xff },	/* END MARKER */
};

/* This initializes the OV6x20 camera chip and relevant variables. */
static int ov6x20_init(struct i2c_client *c)
{
	struct ovcamchip *ov = i2c_get_clientdata(c);
	struct ov6x20 *s;
	int rc;

	DDEBUG(4, &c->dev, "entered");

	switch (c->adapter->id) {
	case I2C_HW_SMBUS_OV511:
		rc = ov_write_regvals(c, regvals_init_6x20_511);
		break;
	case I2C_HW_SMBUS_OV518:
		rc = ov_write_regvals(c, regvals_init_6x20_518);
		break;
	default:
		dev_err(&c->dev, "ov6x20: Unsupported adapter\n");
		rc = -ENODEV;
	}

	if (rc < 0)
		return rc;

	ov->spriv = s = kmalloc(sizeof *s, GFP_KERNEL);
	if (!s)
		return -ENOMEM;
	memset(s, 0, sizeof *s);

	s->auto_brt = 1;
	s->auto_exp = 1;

	return rc;
}

static int ov6x20_free(struct i2c_client *c)
{
	struct ovcamchip *ov = i2c_get_clientdata(c);

	kfree(ov->spriv);
	return 0;
}

static int ov6x20_set_control(struct i2c_client *c,
			      struct ovcamchip_control *ctl)
{
	struct ovcamchip *ov = i2c_get_clientdata(c);
	struct ov6x20 *s = ov->spriv;
	int rc;
	int v = ctl->value;

	switch (ctl->id) {
	case OVCAMCHIP_CID_CONT:
		rc = ov_write(c, REG_CNT, v >> 8);
		break;
	case OVCAMCHIP_CID_BRIGHT:
		rc = ov_write(c, REG_BRT, v >> 8);
		break;
	case OVCAMCHIP_CID_SAT:
		rc = ov_write(c, REG_SAT, v >> 8);
		break;
	case OVCAMCHIP_CID_HUE:
		rc = ov_write(c, REG_RED, 0xFF - (v >> 8));
		if (rc < 0)
			goto out;

		rc = ov_write(c, REG_BLUE, v >> 8);
		break;
	case OVCAMCHIP_CID_EXP:
		rc = ov_write(c, REG_EXP, v);
		break;
	case OVCAMCHIP_CID_FREQ:
	{
		int sixty = (v == 60);

		rc = ov_write(c, 0x2b, sixty?0xa8:0x28);
		if (rc < 0)
			goto out;

		rc = ov_write(c, 0x2a, sixty?0x84:0xa4);
		break;
	}
	case OVCAMCHIP_CID_BANDFILT:
		rc = ov_write_mask(c, 0x2d, v?0x04:0x00, 0x04);
		s->bandfilt = v;
		break;
	case OVCAMCHIP_CID_AUTOBRIGHT:
		rc = ov_write_mask(c, 0x2d, v?0x10:0x00, 0x10);
		s->auto_brt = v;
		break;
	case OVCAMCHIP_CID_AUTOEXP:
		rc = ov_write_mask(c, 0x13, v?0x01:0x00, 0x01);
		s->auto_exp = v;
		break;
	case OVCAMCHIP_CID_BACKLIGHT:
	{
		rc = ov_write_mask(c, 0x4e, v?0xe0:0xc0, 0xe0);
		if (rc < 0)
			goto out;

		rc = ov_write_mask(c, 0x29, v?0x08:0x00, 0x08);
		if (rc < 0)
			goto out;

		rc = ov_write_mask(c, 0x0e, v?0x80:0x00, 0x80);
		s->backlight = v;
		break;
	}
	case OVCAMCHIP_CID_MIRROR:
		rc = ov_write_mask(c, 0x12, v?0x40:0x00, 0x40);
		s->mirror = v;
		break;
	default:
		DDEBUG(2, &c->dev, "control not supported: %d", ctl->id);
		return -EPERM;
	}

out:
	DDEBUG(3, &c->dev, "id=%d, arg=%d, rc=%d", ctl->id, v, rc);
	return rc;
}

static int ov6x20_get_control(struct i2c_client *c,
			      struct ovcamchip_control *ctl)
{
	struct ovcamchip *ov = i2c_get_clientdata(c);
	struct ov6x20 *s = ov->spriv;
	int rc = 0;
	unsigned char val = 0;

	switch (ctl->id) {
	case OVCAMCHIP_CID_CONT:
		rc = ov_read(c, REG_CNT, &val);
		ctl->value = val << 8;
		break;
	case OVCAMCHIP_CID_BRIGHT:
		rc = ov_read(c, REG_BRT, &val);
		ctl->value = val << 8;
		break;
	case OVCAMCHIP_CID_SAT:
		rc = ov_read(c, REG_SAT, &val);
		ctl->value = val << 8;
		break;
	case OVCAMCHIP_CID_HUE:
		rc = ov_read(c, REG_BLUE, &val);
		ctl->value = val << 8;
		break;
	case OVCAMCHIP_CID_EXP:
		rc = ov_read(c, REG_EXP, &val);
		ctl->value = val;
		break;
	case OVCAMCHIP_CID_BANDFILT:
		ctl->value = s->bandfilt;
		break;
	case OVCAMCHIP_CID_AUTOBRIGHT:
		ctl->value = s->auto_brt;
		break;
	case OVCAMCHIP_CID_AUTOEXP:
		ctl->value = s->auto_exp;
		break;
	case OVCAMCHIP_CID_BACKLIGHT:
		ctl->value = s->backlight;
		break;
	case OVCAMCHIP_CID_MIRROR:
		ctl->value = s->mirror;
		break;
	default:
		DDEBUG(2, &c->dev, "control not supported: %d", ctl->id);
		return -EPERM;
	}

	DDEBUG(3, &c->dev, "id=%d, arg=%d, rc=%d", ctl->id, ctl->value, rc);
	return rc;
}

static int ov6x20_mode_init(struct i2c_client *c, struct ovcamchip_window *win)
{
	/******** QCIF-specific regs ********/

	ov_write(c, 0x14, win->quarter?0x24:0x04);

	/******** Palette-specific regs ********/

	/* OV518 needs 8 bit multiplexed in color mode, and 16 bit in B&W */
	if (c->adapter->id == I2C_HW_SMBUS_OV518) {
		if (win->format == VIDEO_PALETTE_GREY)
			ov_write_mask(c, 0x13, 0x00, 0x20);
		else
			ov_write_mask(c, 0x13, 0x20, 0x20);
	} else {
		if (win->format == VIDEO_PALETTE_GREY)
			ov_write_mask(c, 0x13, 0x20, 0x20);
		else
			ov_write_mask(c, 0x13, 0x00, 0x20);
	}

	/******** Clock programming ********/

	/* The OV6620 needs special handling. This prevents the
	 * severe banding that normally occurs */

	/* Clock down */
	ov_write(c, 0x2a, 0x04);

	ov_write(c, 0x11, win->clockdiv);

	ov_write(c, 0x2a, 0x84);
	/* This next setting is critical. It seems to improve
	 * the gain or the contrast. The "reserved" bits seem
	 * to have some effect in this case. */
	ov_write(c, 0x2d, 0x85); /* FIXME: This messes up banding filter */

	return 0;
}

static int ov6x20_set_window(struct i2c_client *c, struct ovcamchip_window *win)
{
	int ret, hwscale, vwscale;

	ret = ov6x20_mode_init(c, win);
	if (ret < 0)
		return ret;

	if (win->quarter) {
		hwscale = 0;
		vwscale = 0;
	} else {
		hwscale = 1;
		vwscale = 1;	/* The datasheet says 0; it's wrong */
	}

	ov_write(c, 0x17, HWSBASE + (win->x >> hwscale));
	ov_write(c, 0x18, HWEBASE + ((win->x + win->width) >> hwscale));
	ov_write(c, 0x19, VWSBASE + (win->y >> vwscale));
	ov_write(c, 0x1a, VWEBASE + ((win->y + win->height) >> vwscale));

	return 0;
}

static int ov6x20_command(struct i2c_client *c, unsigned int cmd, void *arg)
{
	switch (cmd) {
	case OVCAMCHIP_CMD_S_CTRL:
		return ov6x20_set_control(c, arg);
	case OVCAMCHIP_CMD_G_CTRL:
		return ov6x20_get_control(c, arg);
	case OVCAMCHIP_CMD_S_MODE:
		return ov6x20_set_window(c, arg);
	default:
		DDEBUG(2, &c->dev, "command not supported: %d", cmd);
		return -ENOIOCTLCMD;
	}
}

struct ovcamchip_ops ov6x20_ops = {
	.init    =	ov6x20_init,
	.free    =	ov6x20_free,
	.command =	ov6x20_command,
};