summaryrefslogtreecommitdiffstats
path: root/drivers/media/video/adp1653.c
blob: 57e87090388d174089f68e920e72fe6752e2f884 (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
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
/*
 * drivers/media/video/adp1653.c
 *
 * Copyright (C) 2008--2011 Nokia Corporation
 *
 * Contact: Sakari Ailus <sakari.ailus@maxwell.research.nokia.com>
 *
 * Contributors:
 *	Sakari Ailus <sakari.ailus@maxwell.research.nokia.com>
 *	Tuukka Toivonen <tuukkat76@gmail.com>
 *
 * 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.
 *
 * 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., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 * TODO:
 * - fault interrupt handling
 * - hardware strobe
 * - power doesn't need to be ON if all lights are off
 *
 */

#include <linux/delay.h>
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <media/adp1653.h>
#include <media/v4l2-device.h>

#define TIMEOUT_MAX		820000
#define TIMEOUT_STEP		54600
#define TIMEOUT_MIN		(TIMEOUT_MAX - ADP1653_REG_CONFIG_TMR_SET_MAX \
				 * TIMEOUT_STEP)
#define TIMEOUT_US_TO_CODE(t)	((TIMEOUT_MAX + (TIMEOUT_STEP / 2) - (t)) \
				 / TIMEOUT_STEP)
#define TIMEOUT_CODE_TO_US(c)	(TIMEOUT_MAX - (c) * TIMEOUT_STEP)

/* Write values into ADP1653 registers. */
static int adp1653_update_hw(struct adp1653_flash *flash)
{
	struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev);
	u8 out_sel;
	u8 config = 0;
	int rval;

	out_sel = ADP1653_INDICATOR_INTENSITY_uA_TO_REG(
		flash->indicator_intensity->val)
		<< ADP1653_REG_OUT_SEL_ILED_SHIFT;

	switch (flash->led_mode->val) {
	case V4L2_FLASH_LED_MODE_NONE:
		break;
	case V4L2_FLASH_LED_MODE_FLASH:
		/* Flash mode, light on with strobe, duration from timer */
		config = ADP1653_REG_CONFIG_TMR_CFG;
		config |= TIMEOUT_US_TO_CODE(flash->flash_timeout->val)
			  << ADP1653_REG_CONFIG_TMR_SET_SHIFT;
		break;
	case V4L2_FLASH_LED_MODE_TORCH:
		/* Torch mode, light immediately on, duration indefinite */
		out_sel |= ADP1653_FLASH_INTENSITY_mA_TO_REG(
			flash->torch_intensity->val)
			<< ADP1653_REG_OUT_SEL_HPLED_SHIFT;
		break;
	}

	rval = i2c_smbus_write_byte_data(client, ADP1653_REG_OUT_SEL, out_sel);
	if (rval < 0)
		return rval;

	rval = i2c_smbus_write_byte_data(client, ADP1653_REG_CONFIG, config);
	if (rval < 0)
		return rval;

	return 0;
}

static int adp1653_get_fault(struct adp1653_flash *flash)
{
	struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev);
	int fault;
	int rval;

	fault = i2c_smbus_read_byte_data(client, ADP1653_REG_FAULT);
	if (IS_ERR_VALUE(fault))
		return fault;

	flash->fault |= fault;

	if (!flash->fault)
		return 0;

	/* Clear faults. */
	rval = i2c_smbus_write_byte_data(client, ADP1653_REG_OUT_SEL, 0);
	if (IS_ERR_VALUE(rval))
		return rval;

	flash->led_mode->val = V4L2_FLASH_LED_MODE_NONE;

	rval = adp1653_update_hw(flash);
	if (IS_ERR_VALUE(rval))
		return rval;

	return flash->fault;
}

static int adp1653_strobe(struct adp1653_flash *flash, int enable)
{
	struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev);
	u8 out_sel = ADP1653_INDICATOR_INTENSITY_uA_TO_REG(
		flash->indicator_intensity->val)
		<< ADP1653_REG_OUT_SEL_ILED_SHIFT;
	int rval;

	if (flash->led_mode->val != V4L2_FLASH_LED_MODE_FLASH)
		return -EBUSY;

	if (!enable)
		return i2c_smbus_write_byte_data(client, ADP1653_REG_OUT_SEL,
						 out_sel);

	out_sel |= ADP1653_FLASH_INTENSITY_mA_TO_REG(
		flash->flash_intensity->val)
		<< ADP1653_REG_OUT_SEL_HPLED_SHIFT;
	rval = i2c_smbus_write_byte_data(client, ADP1653_REG_OUT_SEL, out_sel);
	if (rval)
		return rval;

	/* Software strobe using i2c */
	rval = i2c_smbus_write_byte_data(client, ADP1653_REG_SW_STROBE,
		ADP1653_REG_SW_STROBE_SW_STROBE);
	if (rval)
		return rval;
	return i2c_smbus_write_byte_data(client, ADP1653_REG_SW_STROBE, 0);
}

/* --------------------------------------------------------------------------
 * V4L2 controls
 */

static int adp1653_get_ctrl(struct v4l2_ctrl *ctrl)
{
	struct adp1653_flash *flash =
		container_of(ctrl->handler, struct adp1653_flash, ctrls);
	int rval;

	rval = adp1653_get_fault(flash);
	if (IS_ERR_VALUE(rval))
		return rval;

	ctrl->cur.val = 0;

	if (flash->fault & ADP1653_REG_FAULT_FLT_SCP)
		ctrl->cur.val |= V4L2_FLASH_FAULT_SHORT_CIRCUIT;
	if (flash->fault & ADP1653_REG_FAULT_FLT_OT)
		ctrl->cur.val |= V4L2_FLASH_FAULT_OVER_TEMPERATURE;
	if (flash->fault & ADP1653_REG_FAULT_FLT_TMR)
		ctrl->cur.val |= V4L2_FLASH_FAULT_TIMEOUT;
	if (flash->fault & ADP1653_REG_FAULT_FLT_OV)
		ctrl->cur.val |= V4L2_FLASH_FAULT_OVER_VOLTAGE;

	flash->fault = 0;

	return 0;
}

static int adp1653_set_ctrl(struct v4l2_ctrl *ctrl)
{
	struct adp1653_flash *flash =
		container_of(ctrl->handler, struct adp1653_flash, ctrls);
	int rval;

	rval = adp1653_get_fault(flash);
	if (IS_ERR_VALUE(rval))
		return rval;
	if ((rval & (ADP1653_REG_FAULT_FLT_SCP |
		     ADP1653_REG_FAULT_FLT_OT |
		     ADP1653_REG_FAULT_FLT_OV)) &&
	    (ctrl->id == V4L2_CID_FLASH_STROBE ||
	     ctrl->id == V4L2_CID_FLASH_TORCH_INTENSITY ||
	     ctrl->id == V4L2_CID_FLASH_LED_MODE))
		return -EBUSY;

	switch (ctrl->id) {
	case V4L2_CID_FLASH_STROBE:
		return adp1653_strobe(flash, 1);
	case V4L2_CID_FLASH_STROBE_STOP:
		return adp1653_strobe(flash, 0);
	}

	return adp1653_update_hw(flash);
}

static const struct v4l2_ctrl_ops adp1653_ctrl_ops = {
	.g_volatile_ctrl = adp1653_get_ctrl,
	.s_ctrl = adp1653_set_ctrl,
};

static int adp1653_init_controls(struct adp1653_flash *flash)
{
	struct v4l2_ctrl *fault;

	v4l2_ctrl_handler_init(&flash->ctrls, 9);

	flash->led_mode =
		v4l2_ctrl_new_std_menu(&flash->ctrls, &adp1653_ctrl_ops,
				       V4L2_CID_FLASH_LED_MODE,
				       V4L2_FLASH_LED_MODE_TORCH, ~0x7, 0);
	v4l2_ctrl_new_std_menu(&flash->ctrls, &adp1653_ctrl_ops,
			       V4L2_CID_FLASH_STROBE_SOURCE,
			       V4L2_FLASH_STROBE_SOURCE_SOFTWARE, ~0x1, 0);
	v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops,
			  V4L2_CID_FLASH_STROBE, 0, 0, 0, 0);
	v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops,
			  V4L2_CID_FLASH_STROBE_STOP, 0, 0, 0, 0);
	flash->flash_timeout =
		v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops,
				  V4L2_CID_FLASH_TIMEOUT, TIMEOUT_MIN,
				  flash->platform_data->max_flash_timeout,
				  TIMEOUT_STEP,
				  flash->platform_data->max_flash_timeout);
	flash->flash_intensity =
		v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops,
				  V4L2_CID_FLASH_INTENSITY,
				  ADP1653_FLASH_INTENSITY_MIN,
				  flash->platform_data->max_flash_intensity,
				  1, flash->platform_data->max_flash_intensity);
	flash->torch_intensity =
		v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops,
				  V4L2_CID_FLASH_TORCH_INTENSITY,
				  ADP1653_TORCH_INTENSITY_MIN,
				  flash->platform_data->max_torch_intensity,
				  ADP1653_FLASH_INTENSITY_STEP,
				  flash->platform_data->max_torch_intensity);
	flash->indicator_intensity =
		v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops,
				  V4L2_CID_FLASH_INDICATOR_INTENSITY,
				  ADP1653_INDICATOR_INTENSITY_MIN,
				  flash->platform_data->max_indicator_intensity,
				  ADP1653_INDICATOR_INTENSITY_STEP,
				  ADP1653_INDICATOR_INTENSITY_MIN);
	fault = v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops,
				  V4L2_CID_FLASH_FAULT, 0,
				  V4L2_FLASH_FAULT_OVER_VOLTAGE
				  | V4L2_FLASH_FAULT_OVER_TEMPERATURE
				  | V4L2_FLASH_FAULT_SHORT_CIRCUIT, 0, 0);

	if (flash->ctrls.error)
		return flash->ctrls.error;

	fault->flags |= V4L2_CTRL_FLAG_VOLATILE;

	flash->subdev.ctrl_handler = &flash->ctrls;
	return 0;
}

/* --------------------------------------------------------------------------
 * V4L2 subdev operations
 */

static int
adp1653_init_device(struct adp1653_flash *flash)
{
	struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev);
	int rval;

	/* Clear FAULT register by writing zero to OUT_SEL */
	rval = i2c_smbus_write_byte_data(client, ADP1653_REG_OUT_SEL, 0);
	if (rval < 0) {
		dev_err(&client->dev, "failed writing fault register\n");
		return -EIO;
	}

	mutex_lock(flash->ctrls.lock);
	/* Reset faults before reading new ones. */
	flash->fault = 0;
	rval = adp1653_get_fault(flash);
	mutex_unlock(flash->ctrls.lock);
	if (rval > 0) {
		dev_err(&client->dev, "faults detected: 0x%1.1x\n", rval);
		return -EIO;
	}

	mutex_lock(flash->ctrls.lock);
	rval = adp1653_update_hw(flash);
	mutex_unlock(flash->ctrls.lock);
	if (rval) {
		dev_err(&client->dev,
			"adp1653_update_hw failed at %s\n", __func__);
		return -EIO;
	}

	return 0;
}

static int
__adp1653_set_power(struct adp1653_flash *flash, int on)
{
	int ret;

	ret = flash->platform_data->power(&flash->subdev, on);
	if (ret < 0)
		return ret;

	if (!on)
		return 0;

	ret = adp1653_init_device(flash);
	if (ret < 0)
		flash->platform_data->power(&flash->subdev, 0);

	return ret;
}

static int
adp1653_set_power(struct v4l2_subdev *subdev, int on)
{
	struct adp1653_flash *flash = to_adp1653_flash(subdev);
	int ret = 0;

	mutex_lock(&flash->power_lock);

	/* If the power count is modified from 0 to != 0 or from != 0 to 0,
	 * update the power state.
	 */
	if (flash->power_count == !on) {
		ret = __adp1653_set_power(flash, !!on);
		if (ret < 0)
			goto done;
	}

	/* Update the power count. */
	flash->power_count += on ? 1 : -1;
	WARN_ON(flash->power_count < 0);

done:
	mutex_unlock(&flash->power_lock);
	return ret;
}

static int adp1653_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
{
	return adp1653_set_power(sd, 1);
}

static int adp1653_close(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
{
	return adp1653_set_power(sd, 0);
}

static const struct v4l2_subdev_core_ops adp1653_core_ops = {
	.s_power = adp1653_set_power,
};

static const struct v4l2_subdev_ops adp1653_ops = {
	.core = &adp1653_core_ops,
};

static const struct v4l2_subdev_internal_ops adp1653_internal_ops = {
	.open = adp1653_open,
	.close = adp1653_close,
};

/* --------------------------------------------------------------------------
 * I2C driver
 */
#ifdef CONFIG_PM

static int adp1653_suspend(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct v4l2_subdev *subdev = i2c_get_clientdata(client);
	struct adp1653_flash *flash = to_adp1653_flash(subdev);

	if (!flash->power_count)
		return 0;

	return __adp1653_set_power(flash, 0);
}

static int adp1653_resume(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct v4l2_subdev *subdev = i2c_get_clientdata(client);
	struct adp1653_flash *flash = to_adp1653_flash(subdev);

	if (!flash->power_count)
		return 0;

	return __adp1653_set_power(flash, 1);
}

#else

#define adp1653_suspend	NULL
#define adp1653_resume	NULL

#endif /* CONFIG_PM */

static int adp1653_probe(struct i2c_client *client,
			 const struct i2c_device_id *devid)
{
	struct adp1653_flash *flash;
	int ret;

	/* we couldn't work without platform data */
	if (client->dev.platform_data == NULL)
		return -ENODEV;

	flash = kzalloc(sizeof(*flash), GFP_KERNEL);
	if (flash == NULL)
		return -ENOMEM;

	flash->platform_data = client->dev.platform_data;

	mutex_init(&flash->power_lock);

	v4l2_i2c_subdev_init(&flash->subdev, client, &adp1653_ops);
	flash->subdev.internal_ops = &adp1653_internal_ops;
	flash->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;

	ret = adp1653_init_controls(flash);
	if (ret)
		goto free_and_quit;

	ret = media_entity_init(&flash->subdev.entity, 0, NULL, 0);
	if (ret < 0)
		goto free_and_quit;

	flash->subdev.entity.type = MEDIA_ENT_T_V4L2_SUBDEV_FLASH;

	return 0;

free_and_quit:
	v4l2_ctrl_handler_free(&flash->ctrls);
	kfree(flash);
	return ret;
}

static int __exit adp1653_remove(struct i2c_client *client)
{
	struct v4l2_subdev *subdev = i2c_get_clientdata(client);
	struct adp1653_flash *flash = to_adp1653_flash(subdev);

	v4l2_device_unregister_subdev(&flash->subdev);
	v4l2_ctrl_handler_free(&flash->ctrls);
	media_entity_cleanup(&flash->subdev.entity);
	kfree(flash);
	return 0;
}

static const struct i2c_device_id adp1653_id_table[] = {
	{ ADP1653_NAME, 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, adp1653_id_table);

static struct dev_pm_ops adp1653_pm_ops = {
	.suspend	= adp1653_suspend,
	.resume		= adp1653_resume,
};

static struct i2c_driver adp1653_i2c_driver = {
	.driver		= {
		.name	= ADP1653_NAME,
		.pm	= &adp1653_pm_ops,
	},
	.probe		= adp1653_probe,
	.remove		= __exit_p(adp1653_remove),
	.id_table	= adp1653_id_table,
};

module_i2c_driver(adp1653_i2c_driver);

MODULE_AUTHOR("Sakari Ailus <sakari.ailus@nokia.com>");
MODULE_DESCRIPTION("Analog Devices ADP1653 LED flash driver");
MODULE_LICENSE("GPL");