summaryrefslogtreecommitdiffstats
path: root/drivers/input/misc/max8997_haptic.c
blob: 5b3154edf822bc808d769f52014a38e2d0a9cb07 (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
/*
 * MAX8997-haptic controller driver
 *
 * Copyright (C) 2012 Samsung Electronics
 * Donggeun Kim <dg77.kim@samsung.com>
 *
 * This program is not provided / owned by Maxim Integrated Products.
 *
 * 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.
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/err.h>
#include <linux/pwm.h>
#include <linux/input.h>
#include <linux/mfd/max8997-private.h>
#include <linux/mfd/max8997.h>
#include <linux/regulator/consumer.h>

/* Haptic configuration 2 register */
#define MAX8997_MOTOR_TYPE_SHIFT	7
#define MAX8997_ENABLE_SHIFT		6
#define MAX8997_MODE_SHIFT		5

/* Haptic driver configuration register */
#define MAX8997_CYCLE_SHIFT		6
#define MAX8997_SIG_PERIOD_SHIFT	4
#define MAX8997_SIG_DUTY_SHIFT		2
#define MAX8997_PWM_DUTY_SHIFT		0

struct max8997_haptic {
	struct device *dev;
	struct i2c_client *client;
	struct input_dev *input_dev;
	struct regulator *regulator;

	struct work_struct work;
	struct mutex mutex;

	bool enabled;
	unsigned int level;

	struct pwm_device *pwm;
	unsigned int pwm_period;
	enum max8997_haptic_pwm_divisor pwm_divisor;

	enum max8997_haptic_motor_type type;
	enum max8997_haptic_pulse_mode mode;

	unsigned int internal_mode_pattern;
	unsigned int pattern_cycle;
	unsigned int pattern_signal_period;
};

static int max8997_haptic_set_duty_cycle(struct max8997_haptic *chip)
{
	int ret = 0;

	if (chip->mode == MAX8997_EXTERNAL_MODE) {
		unsigned int duty = chip->pwm_period * chip->level / 100;
		ret = pwm_config(chip->pwm, duty, chip->pwm_period);
	} else {
		int i;
		u8 duty_index = 0;

		for (i = 0; i <= 64; i++) {
			if (chip->level <= i * 100 / 64) {
				duty_index = i;
				break;
			}
		}
		switch (chip->internal_mode_pattern) {
		case 0:
			max8997_write_reg(chip->client,
				MAX8997_HAPTIC_REG_SIGPWMDC1, duty_index);
			break;
		case 1:
			max8997_write_reg(chip->client,
				MAX8997_HAPTIC_REG_SIGPWMDC2, duty_index);
			break;
		case 2:
			max8997_write_reg(chip->client,
				MAX8997_HAPTIC_REG_SIGPWMDC3, duty_index);
			break;
		case 3:
			max8997_write_reg(chip->client,
				MAX8997_HAPTIC_REG_SIGPWMDC4, duty_index);
			break;
		default:
			break;
		}
	}
	return ret;
}

static void max8997_haptic_configure(struct max8997_haptic *chip)
{
	u8 value;

	value = chip->type << MAX8997_MOTOR_TYPE_SHIFT |
		chip->enabled << MAX8997_ENABLE_SHIFT |
		chip->mode << MAX8997_MODE_SHIFT | chip->pwm_divisor;
	max8997_write_reg(chip->client, MAX8997_HAPTIC_REG_CONF2, value);

	if (chip->mode == MAX8997_INTERNAL_MODE && chip->enabled) {
		value = chip->internal_mode_pattern << MAX8997_CYCLE_SHIFT |
			chip->internal_mode_pattern << MAX8997_SIG_PERIOD_SHIFT |
			chip->internal_mode_pattern << MAX8997_SIG_DUTY_SHIFT |
			chip->internal_mode_pattern << MAX8997_PWM_DUTY_SHIFT;
		max8997_write_reg(chip->client,
			MAX8997_HAPTIC_REG_DRVCONF, value);

		switch (chip->internal_mode_pattern) {
		case 0:
			value = chip->pattern_cycle << 4;
			max8997_write_reg(chip->client,
				MAX8997_HAPTIC_REG_CYCLECONF1, value);
			value = chip->pattern_signal_period;
			max8997_write_reg(chip->client,
				MAX8997_HAPTIC_REG_SIGCONF1, value);
			break;

		case 1:
			value = chip->pattern_cycle;
			max8997_write_reg(chip->client,
				MAX8997_HAPTIC_REG_CYCLECONF1, value);
			value = chip->pattern_signal_period;
			max8997_write_reg(chip->client,
				MAX8997_HAPTIC_REG_SIGCONF2, value);
			break;

		case 2:
			value = chip->pattern_cycle << 4;
			max8997_write_reg(chip->client,
				MAX8997_HAPTIC_REG_CYCLECONF2, value);
			value = chip->pattern_signal_period;
			max8997_write_reg(chip->client,
				MAX8997_HAPTIC_REG_SIGCONF3, value);
			break;

		case 3:
			value = chip->pattern_cycle;
			max8997_write_reg(chip->client,
				MAX8997_HAPTIC_REG_CYCLECONF2, value);
			value = chip->pattern_signal_period;
			max8997_write_reg(chip->client,
				MAX8997_HAPTIC_REG_SIGCONF4, value);
			break;

		default:
			break;
		}
	}
}

static void max8997_haptic_enable(struct max8997_haptic *chip)
{
	int error;

	mutex_lock(&chip->mutex);

	error = max8997_haptic_set_duty_cycle(chip);
	if (error) {
		dev_err(chip->dev, "set_pwm_cycle failed, error: %d\n", error);
		goto out;
	}

	if (!chip->enabled) {
		error = regulator_enable(chip->regulator);
		if (error) {
			dev_err(chip->dev, "Failed to enable regulator\n");
			goto out;
		}
		max8997_haptic_configure(chip);
		if (chip->mode == MAX8997_EXTERNAL_MODE) {
			error = pwm_enable(chip->pwm);
			if (error) {
				dev_err(chip->dev, "Failed to enable PWM\n");
				regulator_disable(chip->regulator);
				goto out;
			}
		}
		chip->enabled = true;
	}

out:
	mutex_unlock(&chip->mutex);
}

static void max8997_haptic_disable(struct max8997_haptic *chip)
{
	mutex_lock(&chip->mutex);

	if (chip->enabled) {
		chip->enabled = false;
		max8997_haptic_configure(chip);
		if (chip->mode == MAX8997_EXTERNAL_MODE)
			pwm_disable(chip->pwm);
		regulator_disable(chip->regulator);
	}

	mutex_unlock(&chip->mutex);
}

static void max8997_haptic_play_effect_work(struct work_struct *work)
{
	struct max8997_haptic *chip =
			container_of(work, struct max8997_haptic, work);

	if (chip->level)
		max8997_haptic_enable(chip);
	else
		max8997_haptic_disable(chip);
}

static int max8997_haptic_play_effect(struct input_dev *dev, void *data,
				  struct ff_effect *effect)
{
	struct max8997_haptic *chip = input_get_drvdata(dev);

	chip->level = effect->u.rumble.strong_magnitude;
	if (!chip->level)
		chip->level = effect->u.rumble.weak_magnitude;

	schedule_work(&chip->work);

	return 0;
}

static void max8997_haptic_close(struct input_dev *dev)
{
	struct max8997_haptic *chip = input_get_drvdata(dev);

	cancel_work_sync(&chip->work);
	max8997_haptic_disable(chip);
}

static int max8997_haptic_probe(struct platform_device *pdev)
{
	struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
	const struct max8997_platform_data *pdata =
					dev_get_platdata(iodev->dev);
	const struct max8997_haptic_platform_data *haptic_pdata =
					pdata->haptic_pdata;
	struct max8997_haptic *chip;
	struct input_dev *input_dev;
	int error;

	if (!haptic_pdata) {
		dev_err(&pdev->dev, "no haptic platform data\n");
		return -EINVAL;
	}

	chip = kzalloc(sizeof(struct max8997_haptic), GFP_KERNEL);
	input_dev = input_allocate_device();
	if (!chip || !input_dev) {
		dev_err(&pdev->dev, "unable to allocate memory\n");
		error = -ENOMEM;
		goto err_free_mem;
	}

	INIT_WORK(&chip->work, max8997_haptic_play_effect_work);
	mutex_init(&chip->mutex);

	chip->client = iodev->haptic;
	chip->dev = &pdev->dev;
	chip->input_dev = input_dev;
	chip->pwm_period = haptic_pdata->pwm_period;
	chip->type = haptic_pdata->type;
	chip->mode = haptic_pdata->mode;
	chip->pwm_divisor = haptic_pdata->pwm_divisor;

	switch (chip->mode) {
	case MAX8997_INTERNAL_MODE:
		chip->internal_mode_pattern =
				haptic_pdata->internal_mode_pattern;
		chip->pattern_cycle = haptic_pdata->pattern_cycle;
		chip->pattern_signal_period =
				haptic_pdata->pattern_signal_period;
		break;

	case MAX8997_EXTERNAL_MODE:
		chip->pwm = pwm_request(haptic_pdata->pwm_channel_id,
					"max8997-haptic");
		if (IS_ERR(chip->pwm)) {
			error = PTR_ERR(chip->pwm);
			dev_err(&pdev->dev,
				"unable to request PWM for haptic, error: %d\n",
				error);
			goto err_free_mem;
		}
		break;

	default:
		dev_err(&pdev->dev,
			"Invalid chip mode specified (%d)\n", chip->mode);
		error = -EINVAL;
		goto err_free_mem;
	}

	chip->regulator = regulator_get(&pdev->dev, "inmotor");
	if (IS_ERR(chip->regulator)) {
		error = PTR_ERR(chip->regulator);
		dev_err(&pdev->dev,
			"unable to get regulator, error: %d\n",
			error);
		goto err_free_pwm;
	}

	input_dev->name = "max8997-haptic";
	input_dev->id.version = 1;
	input_dev->dev.parent = &pdev->dev;
	input_dev->close = max8997_haptic_close;
	input_set_drvdata(input_dev, chip);
	input_set_capability(input_dev, EV_FF, FF_RUMBLE);

	error = input_ff_create_memless(input_dev, NULL,
				max8997_haptic_play_effect);
	if (error) {
		dev_err(&pdev->dev,
			"unable to create FF device, error: %d\n",
			error);
		goto err_put_regulator;
	}

	error = input_register_device(input_dev);
	if (error) {
		dev_err(&pdev->dev,
			"unable to register input device, error: %d\n",
			error);
		goto err_destroy_ff;
	}

	platform_set_drvdata(pdev, chip);
	return 0;

err_destroy_ff:
	input_ff_destroy(input_dev);
err_put_regulator:
	regulator_put(chip->regulator);
err_free_pwm:
	if (chip->mode == MAX8997_EXTERNAL_MODE)
		pwm_free(chip->pwm);
err_free_mem:
	input_free_device(input_dev);
	kfree(chip);

	return error;
}

static int max8997_haptic_remove(struct platform_device *pdev)
{
	struct max8997_haptic *chip = platform_get_drvdata(pdev);

	input_unregister_device(chip->input_dev);
	regulator_put(chip->regulator);

	if (chip->mode == MAX8997_EXTERNAL_MODE)
		pwm_free(chip->pwm);

	kfree(chip);

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int max8997_haptic_suspend(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct max8997_haptic *chip = platform_get_drvdata(pdev);

	max8997_haptic_disable(chip);

	return 0;
}
#endif

static SIMPLE_DEV_PM_OPS(max8997_haptic_pm_ops, max8997_haptic_suspend, NULL);

static const struct platform_device_id max8997_haptic_id[] = {
	{ "max8997-haptic", 0 },
	{ },
};
MODULE_DEVICE_TABLE(i2c, max8997_haptic_id);

static struct platform_driver max8997_haptic_driver = {
	.driver	= {
		.name	= "max8997-haptic",
		.pm	= &max8997_haptic_pm_ops,
	},
	.probe		= max8997_haptic_probe,
	.remove		= max8997_haptic_remove,
	.id_table	= max8997_haptic_id,
};
module_platform_driver(max8997_haptic_driver);

MODULE_ALIAS("platform:max8997-haptic");
MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>");
MODULE_DESCRIPTION("max8997_haptic driver");
MODULE_LICENSE("GPL");