summaryrefslogtreecommitdiffstats
path: root/drivers/input/misc/drv2667.c
blob: 6091f0490e8f6fbfac38181184263d97ce7e2c43 (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
488
489
490
491
492
493
494
495
496
/*
 * DRV2667 haptics driver family
 *
 * Author: Dan Murphy <dmurphy@ti.com>
 *
 * Copyright: (C) 2014 Texas Instruments, Inc.
 *
 * 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.
 */

#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/regulator/consumer.h>

/* Contol registers */
#define DRV2667_STATUS	0x00
#define DRV2667_CTRL_1	0x01
#define DRV2667_CTRL_2	0x02
/* Waveform sequencer */
#define DRV2667_WV_SEQ_0	0x03
#define DRV2667_WV_SEQ_1	0x04
#define DRV2667_WV_SEQ_2	0x05
#define DRV2667_WV_SEQ_3	0x06
#define DRV2667_WV_SEQ_4	0x07
#define DRV2667_WV_SEQ_5	0x08
#define DRV2667_WV_SEQ_6	0x09
#define DRV2667_WV_SEQ_7	0x0A
#define DRV2667_FIFO		0x0B
#define DRV2667_PAGE		0xFF
#define DRV2667_MAX_REG		DRV2667_PAGE

#define DRV2667_PAGE_0		0x00
#define DRV2667_PAGE_1		0x01
#define DRV2667_PAGE_2		0x02
#define DRV2667_PAGE_3		0x03
#define DRV2667_PAGE_4		0x04
#define DRV2667_PAGE_5		0x05
#define DRV2667_PAGE_6		0x06
#define DRV2667_PAGE_7		0x07
#define DRV2667_PAGE_8		0x08

/* RAM fields */
#define DRV2667_RAM_HDR_SZ	0x0
/* RAM Header addresses */
#define DRV2667_RAM_START_HI	0x01
#define DRV2667_RAM_START_LO	0x02
#define DRV2667_RAM_STOP_HI		0x03
#define DRV2667_RAM_STOP_LO		0x04
#define DRV2667_RAM_REPEAT_CT	0x05
/* RAM data addresses */
#define DRV2667_RAM_AMP		0x06
#define DRV2667_RAM_FREQ	0x07
#define DRV2667_RAM_DURATION	0x08
#define DRV2667_RAM_ENVELOPE	0x09

/* Control 1 Register */
#define DRV2667_25_VPP_GAIN		0x00
#define DRV2667_50_VPP_GAIN		0x01
#define DRV2667_75_VPP_GAIN		0x02
#define DRV2667_100_VPP_GAIN	0x03
#define DRV2667_DIGITAL_IN		0xfc
#define DRV2667_ANALOG_IN		(1 << 2)

/* Control 2 Register */
#define DRV2667_GO			(1 << 0)
#define DRV2667_STANDBY		(1 << 6)
#define DRV2667_DEV_RST		(1 << 7)

/* RAM Envelope settings */
#define DRV2667_NO_ENV			0x00
#define DRV2667_32_MS_ENV		0x01
#define DRV2667_64_MS_ENV		0x02
#define DRV2667_96_MS_ENV		0x03
#define DRV2667_128_MS_ENV		0x04
#define DRV2667_160_MS_ENV		0x05
#define DRV2667_192_MS_ENV		0x06
#define DRV2667_224_MS_ENV		0x07
#define DRV2667_256_MS_ENV		0x08
#define DRV2667_512_MS_ENV		0x09
#define DRV2667_768_MS_ENV		0x0a
#define DRV2667_1024_MS_ENV		0x0b
#define DRV2667_1280_MS_ENV		0x0c
#define DRV2667_1536_MS_ENV		0x0d
#define DRV2667_1792_MS_ENV		0x0e
#define DRV2667_2048_MS_ENV		0x0f

/**
 * struct drv2667_data -
 * @input_dev - Pointer to the input device
 * @client - Pointer to the I2C client
 * @regmap - Register map of the device
 * @work - Work item used to off load the enable/disable of the vibration
 * @regulator - Pointer to the regulator for the IC
 * @magnitude - Magnitude of the vibration event
**/
struct drv2667_data {
	struct input_dev *input_dev;
	struct i2c_client *client;
	struct regmap *regmap;
	struct work_struct work;
	struct regulator *regulator;
	u32 page;
	u32 magnitude;
	u32 frequency;
};

static const struct reg_default drv2667_reg_defs[] = {
	{ DRV2667_STATUS, 0x02 },
	{ DRV2667_CTRL_1, 0x28 },
	{ DRV2667_CTRL_2, 0x40 },
	{ DRV2667_WV_SEQ_0, 0x00 },
	{ DRV2667_WV_SEQ_1, 0x00 },
	{ DRV2667_WV_SEQ_2, 0x00 },
	{ DRV2667_WV_SEQ_3, 0x00 },
	{ DRV2667_WV_SEQ_4, 0x00 },
	{ DRV2667_WV_SEQ_5, 0x00 },
	{ DRV2667_WV_SEQ_6, 0x00 },
	{ DRV2667_WV_SEQ_7, 0x00 },
	{ DRV2667_FIFO, 0x00 },
	{ DRV2667_PAGE, 0x00 },
};

static int drv2667_set_waveform_freq(struct drv2667_data *haptics)
{
	unsigned int read_buf;
	int freq;
	int error;

	/* Per the data sheet:
	 * Sinusoid Frequency (Hz) = 7.8125 x Frequency
	 */
	freq = (haptics->frequency * 1000) / 78125;
	if (freq <= 0) {
		dev_err(&haptics->client->dev,
			"ERROR: Frequency calculated to %i\n", freq);
		return -EINVAL;
	}

	error = regmap_read(haptics->regmap, DRV2667_PAGE, &read_buf);
	if (error) {
		dev_err(&haptics->client->dev,
			"Failed to read the page number: %d\n", error);
		return -EIO;
	}

	if (read_buf == DRV2667_PAGE_0 ||
		haptics->page != read_buf) {
		error = regmap_write(haptics->regmap,
				DRV2667_PAGE, haptics->page);
		if (error) {
			dev_err(&haptics->client->dev,
				"Failed to set the page: %d\n", error);
			return -EIO;
		}
	}

	error = regmap_write(haptics->regmap, DRV2667_RAM_FREQ,	freq);
	if (error)
		dev_err(&haptics->client->dev,
				"Failed to set the frequency: %d\n", error);

	/* Reset back to original page */
	if (read_buf == DRV2667_PAGE_0 ||
		haptics->page != read_buf) {
		error = regmap_write(haptics->regmap, DRV2667_PAGE, read_buf);
		if (error) {
			dev_err(&haptics->client->dev,
				"Failed to set the page: %d\n", error);
			return -EIO;
		}
	}

	return error;
}

static void drv2667_worker(struct work_struct *work)
{
	struct drv2667_data *haptics = container_of(work, struct drv2667_data, work);
	int error;

	if (haptics->magnitude) {
		error = regmap_write(haptics->regmap,
				DRV2667_PAGE, haptics->page);
		if (error) {
			dev_err(&haptics->client->dev,
				"Failed to set the page: %d\n", error);
			return;
		}

		error = regmap_write(haptics->regmap, DRV2667_RAM_AMP,
				haptics->magnitude);
		if (error) {
			dev_err(&haptics->client->dev,
				"Failed to set the amplitude: %d\n", error);
			return;
		}

		error = regmap_write(haptics->regmap,
				DRV2667_PAGE, DRV2667_PAGE_0);
		if (error) {
			dev_err(&haptics->client->dev,
				"Failed to set the page: %d\n", error);
			return;
		}

		error = regmap_write(haptics->regmap,
				DRV2667_CTRL_2, DRV2667_GO);
		if (error) {
			dev_err(&haptics->client->dev,
				"Failed to set the GO bit: %d\n", error);
		}
	} else {
		error = regmap_update_bits(haptics->regmap, DRV2667_CTRL_2,
				DRV2667_GO, 0);
		if (error) {
			dev_err(&haptics->client->dev,
				"Failed to unset the GO bit: %d\n", error);
		}
	}
}

static int drv2667_haptics_play(struct input_dev *input, void *data,
				struct ff_effect *effect)
{
	struct drv2667_data *haptics = input_get_drvdata(input);

	if (effect->u.rumble.strong_magnitude > 0)
		haptics->magnitude = effect->u.rumble.strong_magnitude;
	else if (effect->u.rumble.weak_magnitude > 0)
		haptics->magnitude = effect->u.rumble.weak_magnitude;
	else
		haptics->magnitude = 0;

	schedule_work(&haptics->work);

	return 0;
}

static void drv2667_close(struct input_dev *input)
{
	struct drv2667_data *haptics = input_get_drvdata(input);
	int error;

	cancel_work_sync(&haptics->work);

	error = regmap_update_bits(haptics->regmap, DRV2667_CTRL_2,
				   DRV2667_STANDBY, DRV2667_STANDBY);
	if (error)
		dev_err(&haptics->client->dev,
			"Failed to enter standby mode: %d\n", error);
}

static const struct reg_sequence drv2667_init_regs[] = {
	{ DRV2667_CTRL_2, 0 },
	{ DRV2667_CTRL_1, DRV2667_25_VPP_GAIN },
	{ DRV2667_WV_SEQ_0, 1 },
	{ DRV2667_WV_SEQ_1, 0 }
};

static const struct reg_sequence drv2667_page1_init[] = {
	{ DRV2667_RAM_HDR_SZ, 0x05 },
	{ DRV2667_RAM_START_HI, 0x80 },
	{ DRV2667_RAM_START_LO, 0x06 },
	{ DRV2667_RAM_STOP_HI, 0x00 },
	{ DRV2667_RAM_STOP_LO, 0x09 },
	{ DRV2667_RAM_REPEAT_CT, 0 },
	{ DRV2667_RAM_DURATION, 0x05 },
	{ DRV2667_RAM_ENVELOPE, DRV2667_NO_ENV },
	{ DRV2667_RAM_AMP, 0x60 },
};

static int drv2667_init(struct drv2667_data *haptics)
{
	int error;

	/* Set default haptic frequency to 195Hz on Page 1*/
	haptics->frequency = 195;
	haptics->page = DRV2667_PAGE_1;

	error = regmap_register_patch(haptics->regmap,
				      drv2667_init_regs,
				      ARRAY_SIZE(drv2667_init_regs));
	if (error) {
		dev_err(&haptics->client->dev,
			"Failed to write init registers: %d\n",
			error);
		return error;
	}

	error = regmap_write(haptics->regmap, DRV2667_PAGE, haptics->page);
	if (error) {
		dev_err(&haptics->client->dev, "Failed to set page: %d\n",
			error);
		goto error_out;
	}

	error = drv2667_set_waveform_freq(haptics);
	if (error)
		goto error_page;

	error = regmap_register_patch(haptics->regmap,
				      drv2667_page1_init,
				      ARRAY_SIZE(drv2667_page1_init));
	if (error) {
		dev_err(&haptics->client->dev,
			"Failed to write page registers: %d\n",
			error);
		return error;
	}

	error = regmap_write(haptics->regmap, DRV2667_PAGE, DRV2667_PAGE_0);
	return error;

error_page:
	regmap_write(haptics->regmap, DRV2667_PAGE, DRV2667_PAGE_0);
error_out:
	return error;
}

static const struct regmap_config drv2667_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,

	.max_register = DRV2667_MAX_REG,
	.reg_defaults = drv2667_reg_defs,
	.num_reg_defaults = ARRAY_SIZE(drv2667_reg_defs),
	.cache_type = REGCACHE_NONE,
};

static int drv2667_probe(struct i2c_client *client,
			 const struct i2c_device_id *id)
{
	struct drv2667_data *haptics;
	int error;

	haptics = devm_kzalloc(&client->dev, sizeof(*haptics), GFP_KERNEL);
	if (!haptics)
		return -ENOMEM;

	haptics->regulator = devm_regulator_get(&client->dev, "vbat");
	if (IS_ERR(haptics->regulator)) {
		error = PTR_ERR(haptics->regulator);
		dev_err(&client->dev,
			"unable to get regulator, error: %d\n", error);
		return error;
	}

	haptics->input_dev = devm_input_allocate_device(&client->dev);
	if (!haptics->input_dev) {
		dev_err(&client->dev, "Failed to allocate input device\n");
		return -ENOMEM;
	}

	haptics->input_dev->name = "drv2667:haptics";
	haptics->input_dev->dev.parent = client->dev.parent;
	haptics->input_dev->close = drv2667_close;
	input_set_drvdata(haptics->input_dev, haptics);
	input_set_capability(haptics->input_dev, EV_FF, FF_RUMBLE);

	error = input_ff_create_memless(haptics->input_dev, NULL,
					drv2667_haptics_play);
	if (error) {
		dev_err(&client->dev, "input_ff_create() failed: %d\n",
			error);
		return error;
	}

	INIT_WORK(&haptics->work, drv2667_worker);

	haptics->client = client;
	i2c_set_clientdata(client, haptics);

	haptics->regmap = devm_regmap_init_i2c(client, &drv2667_regmap_config);
	if (IS_ERR(haptics->regmap)) {
		error = PTR_ERR(haptics->regmap);
		dev_err(&client->dev, "Failed to allocate register map: %d\n",
			error);
		return error;
	}

	error = drv2667_init(haptics);
	if (error) {
		dev_err(&client->dev, "Device init failed: %d\n", error);
		return error;
	}

	error = input_register_device(haptics->input_dev);
	if (error) {
		dev_err(&client->dev, "couldn't register input device: %d\n",
			error);
		return error;
	}

	return 0;
}

static int __maybe_unused drv2667_suspend(struct device *dev)
{
	struct drv2667_data *haptics = dev_get_drvdata(dev);
	int ret = 0;

	mutex_lock(&haptics->input_dev->mutex);

	if (haptics->input_dev->users) {
		ret = regmap_update_bits(haptics->regmap, DRV2667_CTRL_2,
					 DRV2667_STANDBY, DRV2667_STANDBY);
		if (ret) {
			dev_err(dev, "Failed to set standby mode\n");
			regulator_disable(haptics->regulator);
			goto out;
		}

		ret = regulator_disable(haptics->regulator);
		if (ret) {
			dev_err(dev, "Failed to disable regulator\n");
			regmap_update_bits(haptics->regmap,
					   DRV2667_CTRL_2,
					   DRV2667_STANDBY, 0);
		}
	}
out:
	mutex_unlock(&haptics->input_dev->mutex);
	return ret;
}

static int __maybe_unused drv2667_resume(struct device *dev)
{
	struct drv2667_data *haptics = dev_get_drvdata(dev);
	int ret = 0;

	mutex_lock(&haptics->input_dev->mutex);

	if (haptics->input_dev->users) {
		ret = regulator_enable(haptics->regulator);
		if (ret) {
			dev_err(dev, "Failed to enable regulator\n");
			goto out;
		}

		ret = regmap_update_bits(haptics->regmap, DRV2667_CTRL_2,
					 DRV2667_STANDBY, 0);
		if (ret) {
			dev_err(dev, "Failed to unset standby mode\n");
			regulator_disable(haptics->regulator);
			goto out;
		}

	}

out:
	mutex_unlock(&haptics->input_dev->mutex);
	return ret;
}

static SIMPLE_DEV_PM_OPS(drv2667_pm_ops, drv2667_suspend, drv2667_resume);

static const struct i2c_device_id drv2667_id[] = {
	{ "drv2667", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, drv2667_id);

#ifdef CONFIG_OF
static const struct of_device_id drv2667_of_match[] = {
	{ .compatible = "ti,drv2667", },
	{ }
};
MODULE_DEVICE_TABLE(of, drv2667_of_match);
#endif

static struct i2c_driver drv2667_driver = {
	.probe		= drv2667_probe,
	.driver		= {
		.name	= "drv2667-haptics",
		.of_match_table = of_match_ptr(drv2667_of_match),
		.pm	= &drv2667_pm_ops,
	},
	.id_table = drv2667_id,
};
module_i2c_driver(drv2667_driver);

MODULE_DESCRIPTION("TI DRV2667 haptics driver");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");