aboutsummaryrefslogtreecommitdiff
path: root/drivers/media/video/indycam.c
blob: e5ed4db32e7bfcfb00ed7ebc3cce2f9176563944 (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
/*
 *  indycam.c - Silicon Graphics IndyCam digital camera driver
 *
 *  Copyright (C) 2003 Ladislav Michl <ladis@linux-mips.org>
 *  Copyright (C) 2004,2005 Mikael Nousiainen <tmnousia@cc.hut.fi>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 */

#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/major.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/slab.h>

/* IndyCam decodes stream of photons into digital image representation ;-) */
#include <linux/videodev2.h>
#include <linux/i2c.h>
#include <media/v4l2-device.h>
#include <media/v4l2-chip-ident.h>

#include "indycam.h"

#define INDYCAM_MODULE_VERSION "0.0.5"

MODULE_DESCRIPTION("SGI IndyCam driver");
MODULE_VERSION(INDYCAM_MODULE_VERSION);
MODULE_AUTHOR("Mikael Nousiainen <tmnousia@cc.hut.fi>");
MODULE_LICENSE("GPL");


// #define INDYCAM_DEBUG

#ifdef INDYCAM_DEBUG
#define dprintk(x...) printk("IndyCam: " x);
#define indycam_regdump(client) indycam_regdump_debug(client)
#else
#define dprintk(x...)
#define indycam_regdump(client)
#endif

struct indycam {
	struct v4l2_subdev sd;
	u8 version;
};

static inline struct indycam *to_indycam(struct v4l2_subdev *sd)
{
	return container_of(sd, struct indycam, sd);
}

static const u8 initseq[] = {
	INDYCAM_CONTROL_AGCENA,		/* INDYCAM_CONTROL */
	INDYCAM_SHUTTER_60,		/* INDYCAM_SHUTTER */
	INDYCAM_GAIN_DEFAULT,		/* INDYCAM_GAIN */
	0x00,				/* INDYCAM_BRIGHTNESS (read-only) */
	INDYCAM_RED_BALANCE_DEFAULT,	/* INDYCAM_RED_BALANCE */
	INDYCAM_BLUE_BALANCE_DEFAULT,	/* INDYCAM_BLUE_BALANCE */
	INDYCAM_RED_SATURATION_DEFAULT,	/* INDYCAM_RED_SATURATION */
	INDYCAM_BLUE_SATURATION_DEFAULT,/* INDYCAM_BLUE_SATURATION */
};

/* IndyCam register handling */

static int indycam_read_reg(struct v4l2_subdev *sd, u8 reg, u8 *value)
{
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	int ret;

	if (reg == INDYCAM_REG_RESET) {
		dprintk("indycam_read_reg(): "
			"skipping write-only register %d\n", reg);
		*value = 0;
		return 0;
	}

	ret = i2c_smbus_read_byte_data(client, reg);

	if (ret < 0) {
		printk(KERN_ERR "IndyCam: indycam_read_reg(): read failed, "
		       "register = 0x%02x\n", reg);
		return ret;
	}

	*value = (u8)ret;

	return 0;
}

static int indycam_write_reg(struct v4l2_subdev *sd, u8 reg, u8 value)
{
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	int err;

	if (reg == INDYCAM_REG_BRIGHTNESS || reg == INDYCAM_REG_VERSION) {
		dprintk("indycam_write_reg(): "
			"skipping read-only register %d\n", reg);
		return 0;
	}

	dprintk("Writing Reg %d = 0x%02x\n", reg, value);
	err = i2c_smbus_write_byte_data(client, reg, value);

	if (err) {
		printk(KERN_ERR "IndyCam: indycam_write_reg(): write failed, "
		       "register = 0x%02x, value = 0x%02x\n", reg, value);
	}
	return err;
}

static int indycam_write_block(struct v4l2_subdev *sd, u8 reg,
			       u8 length, u8 *data)
{
	int i, err;

	for (i = 0; i < length; i++) {
		err = indycam_write_reg(sd, reg + i, data[i]);
		if (err)
			return err;
	}

	return 0;
}

/* Helper functions */

#ifdef INDYCAM_DEBUG
static void indycam_regdump_debug(struct v4l2_subdev *sd)
{
	int i;
	u8 val;

	for (i = 0; i < 9; i++) {
		indycam_read_reg(sd, i, &val);
		dprintk("Reg %d = 0x%02x\n", i, val);
	}
}
#endif

static int indycam_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
{
	struct indycam *camera = to_indycam(sd);
	u8 reg;
	int ret = 0;

	switch (ctrl->id) {
	case V4L2_CID_AUTOGAIN:
	case V4L2_CID_AUTO_WHITE_BALANCE:
		ret = indycam_read_reg(sd, INDYCAM_REG_CONTROL, &reg);
		if (ret)
			return -EIO;
		if (ctrl->id == V4L2_CID_AUTOGAIN)
			ctrl->value = (reg & INDYCAM_CONTROL_AGCENA)
				? 1 : 0;
		else
			ctrl->value = (reg & INDYCAM_CONTROL_AWBCTL)
				? 1 : 0;
		break;
	case V4L2_CID_EXPOSURE:
		ret = indycam_read_reg(sd, INDYCAM_REG_SHUTTER, &reg);
		if (ret)
			return -EIO;
		ctrl->value = ((s32)reg == 0x00) ? 0xff : ((s32)reg - 1);
		break;
	case V4L2_CID_GAIN:
		ret = indycam_read_reg(sd, INDYCAM_REG_GAIN, &reg);
		if (ret)
			return -EIO;
		ctrl->value = (s32)reg;
		break;
	case V4L2_CID_RED_BALANCE:
		ret = indycam_read_reg(sd, INDYCAM_REG_RED_BALANCE, &reg);
		if (ret)
			return -EIO;
		ctrl->value = (s32)reg;
		break;
	case V4L2_CID_BLUE_BALANCE:
		ret = indycam_read_reg(sd, INDYCAM_REG_BLUE_BALANCE, &reg);
		if (ret)
			return -EIO;
		ctrl->value = (s32)reg;
		break;
	case INDYCAM_CONTROL_RED_SATURATION:
		ret = indycam_read_reg(sd,
				       INDYCAM_REG_RED_SATURATION, &reg);
		if (ret)
			return -EIO;
		ctrl->value = (s32)reg;
		break;
	case INDYCAM_CONTROL_BLUE_SATURATION:
		ret = indycam_read_reg(sd,
				       INDYCAM_REG_BLUE_SATURATION, &reg);
		if (ret)
			return -EIO;
		ctrl->value = (s32)reg;
		break;
	case V4L2_CID_GAMMA:
		if (camera->version == CAMERA_VERSION_MOOSE) {
			ret = indycam_read_reg(sd,
					       INDYCAM_REG_GAMMA, &reg);
			if (ret)
				return -EIO;
			ctrl->value = (s32)reg;
		} else {
			ctrl->value = INDYCAM_GAMMA_DEFAULT;
		}
		break;
	default:
		ret = -EINVAL;
	}

	return ret;
}

static int indycam_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
{
	struct indycam *camera = to_indycam(sd);
	u8 reg;
	int ret = 0;

	switch (ctrl->id) {
	case V4L2_CID_AUTOGAIN:
	case V4L2_CID_AUTO_WHITE_BALANCE:
		ret = indycam_read_reg(sd, INDYCAM_REG_CONTROL, &reg);
		if (ret)
			break;

		if (ctrl->id == V4L2_CID_AUTOGAIN) {
			if (ctrl->value)
				reg |= INDYCAM_CONTROL_AGCENA;
			else
				reg &= ~INDYCAM_CONTROL_AGCENA;
		} else {
			if (ctrl->value)
				reg |= INDYCAM_CONTROL_AWBCTL;
			else
				reg &= ~INDYCAM_CONTROL_AWBCTL;
		}

		ret = indycam_write_reg(sd, INDYCAM_REG_CONTROL, reg);
		break;
	case V4L2_CID_EXPOSURE:
		reg = (ctrl->value == 0xff) ? 0x00 : (ctrl->value + 1);
		ret = indycam_write_reg(sd, INDYCAM_REG_SHUTTER, reg);
		break;
	case V4L2_CID_GAIN:
		ret = indycam_write_reg(sd, INDYCAM_REG_GAIN, ctrl->value);
		break;
	case V4L2_CID_RED_BALANCE:
		ret = indycam_write_reg(sd, INDYCAM_REG_RED_BALANCE,
					ctrl->value);
		break;
	case V4L2_CID_BLUE_BALANCE:
		ret = indycam_write_reg(sd, INDYCAM_REG_BLUE_BALANCE,
					ctrl->value);
		break;
	case INDYCAM_CONTROL_RED_SATURATION:
		ret = indycam_write_reg(sd, INDYCAM_REG_RED_SATURATION,
					ctrl->value);
		break;
	case INDYCAM_CONTROL_BLUE_SATURATION:
		ret = indycam_write_reg(sd, INDYCAM_REG_BLUE_SATURATION,
					ctrl->value);
		break;
	case V4L2_CID_GAMMA:
		if (camera->version == CAMERA_VERSION_MOOSE) {
			ret = indycam_write_reg(sd, INDYCAM_REG_GAMMA,
						ctrl->value);
		}
		break;
	default:
		ret = -EINVAL;
	}

	return ret;
}

/* I2C-interface */

static int indycam_g_chip_ident(struct v4l2_subdev *sd,
		struct v4l2_dbg_chip_ident *chip)
{
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	struct indycam *camera = to_indycam(sd);

	return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_INDYCAM,
		       camera->version);
}

/* ----------------------------------------------------------------------- */

static const struct v4l2_subdev_core_ops indycam_core_ops = {
	.g_chip_ident = indycam_g_chip_ident,
	.g_ctrl = indycam_g_ctrl,
	.s_ctrl = indycam_s_ctrl,
};

static const struct v4l2_subdev_ops indycam_ops = {
	.core = &indycam_core_ops,
};

static int indycam_probe(struct i2c_client *client,
			  const struct i2c_device_id *id)
{
	int err = 0;
	struct indycam *camera;
	struct v4l2_subdev *sd;

	v4l_info(client, "chip found @ 0x%x (%s)\n",
			client->addr << 1, client->adapter->name);

	camera = kzalloc(sizeof(struct indycam), GFP_KERNEL);
	if (!camera)
		return -ENOMEM;

	sd = &camera->sd;
	v4l2_i2c_subdev_init(sd, client, &indycam_ops);

	camera->version = i2c_smbus_read_byte_data(client,
						   INDYCAM_REG_VERSION);
	if (camera->version != CAMERA_VERSION_INDY &&
	    camera->version != CAMERA_VERSION_MOOSE) {
		kfree(camera);
		return -ENODEV;
	}

	printk(KERN_INFO "IndyCam v%d.%d detected\n",
	       INDYCAM_VERSION_MAJOR(camera->version),
	       INDYCAM_VERSION_MINOR(camera->version));

	indycam_regdump(sd);

	// initialize
	err = indycam_write_block(sd, 0, sizeof(initseq), (u8 *)&initseq);
	if (err) {
		printk(KERN_ERR "IndyCam initialization failed\n");
		kfree(camera);
		return -EIO;
	}

	indycam_regdump(sd);

	// white balance
	err = indycam_write_reg(sd, INDYCAM_REG_CONTROL,
			  INDYCAM_CONTROL_AGCENA | INDYCAM_CONTROL_AWBCTL);
	if (err) {
		printk(KERN_ERR "IndyCam: White balancing camera failed\n");
		kfree(camera);
		return -EIO;
	}

	indycam_regdump(sd);

	printk(KERN_INFO "IndyCam initialized\n");

	return 0;
}

static int indycam_remove(struct i2c_client *client)
{
	struct v4l2_subdev *sd = i2c_get_clientdata(client);

	v4l2_device_unregister_subdev(sd);
	kfree(to_indycam(sd));
	return 0;
}

static const struct i2c_device_id indycam_id[] = {
	{ "indycam", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, indycam_id);

static struct i2c_driver indycam_driver = {
	.driver = {
		.owner	= THIS_MODULE,
		.name	= "indycam",
	},
	.probe		= indycam_probe,
	.remove		= indycam_remove,
	.id_table	= indycam_id,
};

static __init int init_indycam(void)
{
	return i2c_add_driver(&indycam_driver);
}

static __exit void exit_indycam(void)
{
	i2c_del_driver(&indycam_driver);
}

module_init(init_indycam);
module_exit(exit_indycam);