xref: /openbmc/linux/drivers/input/misc/drv260x.c (revision d8bde56d)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * DRV260X haptics driver family
4  *
5  * Author: Dan Murphy <dmurphy@ti.com>
6  *
7  * Copyright:   (C) 2014 Texas Instruments, Inc.
8  */
9 
10 #include <linux/i2c.h>
11 #include <linux/input.h>
12 #include <linux/module.h>
13 #include <linux/regmap.h>
14 #include <linux/slab.h>
15 #include <linux/delay.h>
16 #include <linux/gpio/consumer.h>
17 #include <linux/regulator/consumer.h>
18 
19 #include <dt-bindings/input/ti-drv260x.h>
20 
21 #define DRV260X_STATUS		0x0
22 #define DRV260X_MODE		0x1
23 #define DRV260X_RT_PB_IN	0x2
24 #define DRV260X_LIB_SEL		0x3
25 #define DRV260X_WV_SEQ_1	0x4
26 #define DRV260X_WV_SEQ_2	0x5
27 #define DRV260X_WV_SEQ_3	0x6
28 #define DRV260X_WV_SEQ_4	0x7
29 #define DRV260X_WV_SEQ_5	0x8
30 #define DRV260X_WV_SEQ_6	0x9
31 #define DRV260X_WV_SEQ_7	0xa
32 #define DRV260X_WV_SEQ_8	0xb
33 #define DRV260X_GO				0xc
34 #define DRV260X_OVERDRIVE_OFF	0xd
35 #define DRV260X_SUSTAIN_P_OFF	0xe
36 #define DRV260X_SUSTAIN_N_OFF	0xf
37 #define DRV260X_BRAKE_OFF		0x10
38 #define DRV260X_A_TO_V_CTRL		0x11
39 #define DRV260X_A_TO_V_MIN_INPUT	0x12
40 #define DRV260X_A_TO_V_MAX_INPUT	0x13
41 #define DRV260X_A_TO_V_MIN_OUT	0x14
42 #define DRV260X_A_TO_V_MAX_OUT	0x15
43 #define DRV260X_RATED_VOLT		0x16
44 #define DRV260X_OD_CLAMP_VOLT	0x17
45 #define DRV260X_CAL_COMP		0x18
46 #define DRV260X_CAL_BACK_EMF	0x19
47 #define DRV260X_FEEDBACK_CTRL	0x1a
48 #define DRV260X_CTRL1			0x1b
49 #define DRV260X_CTRL2			0x1c
50 #define DRV260X_CTRL3			0x1d
51 #define DRV260X_CTRL4			0x1e
52 #define DRV260X_CTRL5			0x1f
53 #define DRV260X_LRA_LOOP_PERIOD	0x20
54 #define DRV260X_VBAT_MON		0x21
55 #define DRV260X_LRA_RES_PERIOD	0x22
56 #define DRV260X_MAX_REG			0x23
57 
58 #define DRV260X_GO_BIT				0x01
59 
60 /* Library Selection */
61 #define DRV260X_LIB_SEL_MASK		0x07
62 #define DRV260X_LIB_SEL_RAM			0x0
63 #define DRV260X_LIB_SEL_OD			0x1
64 #define DRV260X_LIB_SEL_40_60		0x2
65 #define DRV260X_LIB_SEL_60_80		0x3
66 #define DRV260X_LIB_SEL_100_140		0x4
67 #define DRV260X_LIB_SEL_140_PLUS	0x5
68 
69 #define DRV260X_LIB_SEL_HIZ_MASK	0x10
70 #define DRV260X_LIB_SEL_HIZ_EN		0x01
71 #define DRV260X_LIB_SEL_HIZ_DIS		0
72 
73 /* Mode register */
74 #define DRV260X_STANDBY				(1 << 6)
75 #define DRV260X_STANDBY_MASK		0x40
76 #define DRV260X_INTERNAL_TRIGGER	0x00
77 #define DRV260X_EXT_TRIGGER_EDGE	0x01
78 #define DRV260X_EXT_TRIGGER_LEVEL	0x02
79 #define DRV260X_PWM_ANALOG_IN		0x03
80 #define DRV260X_AUDIOHAPTIC			0x04
81 #define DRV260X_RT_PLAYBACK			0x05
82 #define DRV260X_DIAGNOSTICS			0x06
83 #define DRV260X_AUTO_CAL			0x07
84 
85 /* Audio to Haptics Control */
86 #define DRV260X_AUDIO_HAPTICS_PEAK_10MS		(0 << 2)
87 #define DRV260X_AUDIO_HAPTICS_PEAK_20MS		(1 << 2)
88 #define DRV260X_AUDIO_HAPTICS_PEAK_30MS		(2 << 2)
89 #define DRV260X_AUDIO_HAPTICS_PEAK_40MS		(3 << 2)
90 
91 #define DRV260X_AUDIO_HAPTICS_FILTER_100HZ	0x00
92 #define DRV260X_AUDIO_HAPTICS_FILTER_125HZ	0x01
93 #define DRV260X_AUDIO_HAPTICS_FILTER_150HZ	0x02
94 #define DRV260X_AUDIO_HAPTICS_FILTER_200HZ	0x03
95 
96 /* Min/Max Input/Output Voltages */
97 #define DRV260X_AUDIO_HAPTICS_MIN_IN_VOLT	0x19
98 #define DRV260X_AUDIO_HAPTICS_MAX_IN_VOLT	0x64
99 #define DRV260X_AUDIO_HAPTICS_MIN_OUT_VOLT	0x19
100 #define DRV260X_AUDIO_HAPTICS_MAX_OUT_VOLT	0xFF
101 
102 /* Feedback register */
103 #define DRV260X_FB_REG_ERM_MODE			0x7f
104 #define DRV260X_FB_REG_LRA_MODE			(1 << 7)
105 
106 #define DRV260X_BRAKE_FACTOR_MASK	0x1f
107 #define DRV260X_BRAKE_FACTOR_2X		(1 << 0)
108 #define DRV260X_BRAKE_FACTOR_3X		(2 << 4)
109 #define DRV260X_BRAKE_FACTOR_4X		(3 << 4)
110 #define DRV260X_BRAKE_FACTOR_6X		(4 << 4)
111 #define DRV260X_BRAKE_FACTOR_8X		(5 << 4)
112 #define DRV260X_BRAKE_FACTOR_16		(6 << 4)
113 #define DRV260X_BRAKE_FACTOR_DIS	(7 << 4)
114 
115 #define DRV260X_LOOP_GAIN_LOW		0xf3
116 #define DRV260X_LOOP_GAIN_MED		(1 << 2)
117 #define DRV260X_LOOP_GAIN_HIGH		(2 << 2)
118 #define DRV260X_LOOP_GAIN_VERY_HIGH	(3 << 2)
119 
120 #define DRV260X_BEMF_GAIN_0			0xfc
121 #define DRV260X_BEMF_GAIN_1		(1 << 0)
122 #define DRV260X_BEMF_GAIN_2		(2 << 0)
123 #define DRV260X_BEMF_GAIN_3		(3 << 0)
124 
125 /* Control 1 register */
126 #define DRV260X_AC_CPLE_EN			(1 << 5)
127 #define DRV260X_STARTUP_BOOST		(1 << 7)
128 
129 /* Control 2 register */
130 
131 #define DRV260X_IDISS_TIME_45		0
132 #define DRV260X_IDISS_TIME_75		(1 << 0)
133 #define DRV260X_IDISS_TIME_150		(1 << 1)
134 #define DRV260X_IDISS_TIME_225		0x03
135 
136 #define DRV260X_BLANK_TIME_45	(0 << 2)
137 #define DRV260X_BLANK_TIME_75	(1 << 2)
138 #define DRV260X_BLANK_TIME_150	(2 << 2)
139 #define DRV260X_BLANK_TIME_225	(3 << 2)
140 
141 #define DRV260X_SAMP_TIME_150	(0 << 4)
142 #define DRV260X_SAMP_TIME_200	(1 << 4)
143 #define DRV260X_SAMP_TIME_250	(2 << 4)
144 #define DRV260X_SAMP_TIME_300	(3 << 4)
145 
146 #define DRV260X_BRAKE_STABILIZER	(1 << 6)
147 #define DRV260X_UNIDIR_IN			(0 << 7)
148 #define DRV260X_BIDIR_IN			(1 << 7)
149 
150 /* Control 3 Register */
151 #define DRV260X_LRA_OPEN_LOOP		(1 << 0)
152 #define DRV260X_ANALOG_IN			(1 << 1)
153 #define DRV260X_LRA_DRV_MODE		(1 << 2)
154 #define DRV260X_RTP_UNSIGNED_DATA	(1 << 3)
155 #define DRV260X_SUPPLY_COMP_DIS		(1 << 4)
156 #define DRV260X_ERM_OPEN_LOOP		(1 << 5)
157 #define DRV260X_NG_THRESH_0			(0 << 6)
158 #define DRV260X_NG_THRESH_2			(1 << 6)
159 #define DRV260X_NG_THRESH_4			(2 << 6)
160 #define DRV260X_NG_THRESH_8			(3 << 6)
161 
162 /* Control 4 Register */
163 #define DRV260X_AUTOCAL_TIME_150MS		(0 << 4)
164 #define DRV260X_AUTOCAL_TIME_250MS		(1 << 4)
165 #define DRV260X_AUTOCAL_TIME_500MS		(2 << 4)
166 #define DRV260X_AUTOCAL_TIME_1000MS		(3 << 4)
167 
168 /**
169  * struct drv260x_data -
170  * @input_dev: Pointer to the input device
171  * @client: Pointer to the I2C client
172  * @regmap: Register map of the device
173  * @work: Work item used to off load the enable/disable of the vibration
174  * @enable_gpio: Pointer to the gpio used for enable/disabling
175  * @regulator: Pointer to the regulator for the IC
176  * @magnitude: Magnitude of the vibration event
177  * @mode: The operating mode of the IC (LRA_NO_CAL, ERM or LRA)
178  * @library: The vibration library to be used
179  * @rated_voltage: The rated_voltage of the actuator
180  * @overdrive_voltage: The over drive voltage of the actuator
181 **/
182 struct drv260x_data {
183 	struct input_dev *input_dev;
184 	struct i2c_client *client;
185 	struct regmap *regmap;
186 	struct work_struct work;
187 	struct gpio_desc *enable_gpio;
188 	struct regulator *regulator;
189 	u8 magnitude;
190 	u32 mode;
191 	u32 library;
192 	int rated_voltage;
193 	int overdrive_voltage;
194 };
195 
196 #define DRV260X_DEF_RATED_VOLT		0x90
197 #define DRV260X_DEF_OD_CLAMP_VOLT	0x90
198 
199 /*
200  * Rated and Overdriver Voltages:
201  * Calculated using the formula r = v * 255 / 5.6
202  * where r is what will be written to the register
203  * and v is the rated or overdriver voltage of the actuator
204  */
drv260x_calculate_voltage(unsigned int voltage)205 static int drv260x_calculate_voltage(unsigned int voltage)
206 {
207 	return (voltage * 255 / 5600);
208 }
209 
drv260x_worker(struct work_struct * work)210 static void drv260x_worker(struct work_struct *work)
211 {
212 	struct drv260x_data *haptics = container_of(work, struct drv260x_data, work);
213 	int error;
214 
215 	gpiod_set_value(haptics->enable_gpio, 1);
216 	/* Data sheet says to wait 250us before trying to communicate */
217 	udelay(250);
218 
219 	error = regmap_write(haptics->regmap,
220 			     DRV260X_MODE, DRV260X_RT_PLAYBACK);
221 	if (error) {
222 		dev_err(&haptics->client->dev,
223 			"Failed to write set mode: %d\n", error);
224 	} else {
225 		error = regmap_write(haptics->regmap,
226 				     DRV260X_RT_PB_IN, haptics->magnitude);
227 		if (error)
228 			dev_err(&haptics->client->dev,
229 				"Failed to set magnitude: %d\n", error);
230 	}
231 }
232 
drv260x_haptics_play(struct input_dev * input,void * data,struct ff_effect * effect)233 static int drv260x_haptics_play(struct input_dev *input, void *data,
234 				struct ff_effect *effect)
235 {
236 	struct drv260x_data *haptics = input_get_drvdata(input);
237 
238 	haptics->mode = DRV260X_LRA_NO_CAL_MODE;
239 
240 	/* Scale u16 magnitude into u8 register value */
241 	if (effect->u.rumble.strong_magnitude > 0)
242 		haptics->magnitude = effect->u.rumble.strong_magnitude >> 8;
243 	else if (effect->u.rumble.weak_magnitude > 0)
244 		haptics->magnitude = effect->u.rumble.weak_magnitude >> 8;
245 	else
246 		haptics->magnitude = 0;
247 
248 	schedule_work(&haptics->work);
249 
250 	return 0;
251 }
252 
drv260x_close(struct input_dev * input)253 static void drv260x_close(struct input_dev *input)
254 {
255 	struct drv260x_data *haptics = input_get_drvdata(input);
256 	int error;
257 
258 	cancel_work_sync(&haptics->work);
259 
260 	error = regmap_write(haptics->regmap, DRV260X_MODE, DRV260X_STANDBY);
261 	if (error)
262 		dev_err(&haptics->client->dev,
263 			"Failed to enter standby mode: %d\n", error);
264 
265 	gpiod_set_value(haptics->enable_gpio, 0);
266 }
267 
268 static const struct reg_sequence drv260x_lra_cal_regs[] = {
269 	{ DRV260X_MODE, DRV260X_AUTO_CAL },
270 	{ DRV260X_CTRL3, DRV260X_NG_THRESH_2 | DRV260X_RTP_UNSIGNED_DATA },
271 	{ DRV260X_FEEDBACK_CTRL, DRV260X_FB_REG_LRA_MODE |
272 		DRV260X_BRAKE_FACTOR_4X | DRV260X_LOOP_GAIN_HIGH },
273 };
274 
275 static const struct reg_sequence drv260x_lra_init_regs[] = {
276 	{ DRV260X_MODE, DRV260X_RT_PLAYBACK },
277 	{ DRV260X_A_TO_V_CTRL, DRV260X_AUDIO_HAPTICS_PEAK_20MS |
278 		DRV260X_AUDIO_HAPTICS_FILTER_125HZ },
279 	{ DRV260X_A_TO_V_MIN_INPUT, DRV260X_AUDIO_HAPTICS_MIN_IN_VOLT },
280 	{ DRV260X_A_TO_V_MAX_INPUT, DRV260X_AUDIO_HAPTICS_MAX_IN_VOLT },
281 	{ DRV260X_A_TO_V_MIN_OUT, DRV260X_AUDIO_HAPTICS_MIN_OUT_VOLT },
282 	{ DRV260X_A_TO_V_MAX_OUT, DRV260X_AUDIO_HAPTICS_MAX_OUT_VOLT },
283 	{ DRV260X_FEEDBACK_CTRL, DRV260X_FB_REG_LRA_MODE |
284 		DRV260X_BRAKE_FACTOR_2X | DRV260X_LOOP_GAIN_MED |
285 		DRV260X_BEMF_GAIN_3 },
286 	{ DRV260X_CTRL1, DRV260X_STARTUP_BOOST },
287 	{ DRV260X_CTRL2, DRV260X_SAMP_TIME_250 },
288 	{ DRV260X_CTRL3, DRV260X_NG_THRESH_2 | DRV260X_RTP_UNSIGNED_DATA | DRV260X_ANALOG_IN },
289 	{ DRV260X_CTRL4, DRV260X_AUTOCAL_TIME_500MS },
290 };
291 
292 static const struct reg_sequence drv260x_erm_cal_regs[] = {
293 	{ DRV260X_MODE, DRV260X_AUTO_CAL },
294 	{ DRV260X_A_TO_V_MIN_INPUT, DRV260X_AUDIO_HAPTICS_MIN_IN_VOLT },
295 	{ DRV260X_A_TO_V_MAX_INPUT, DRV260X_AUDIO_HAPTICS_MAX_IN_VOLT },
296 	{ DRV260X_A_TO_V_MIN_OUT, DRV260X_AUDIO_HAPTICS_MIN_OUT_VOLT },
297 	{ DRV260X_A_TO_V_MAX_OUT, DRV260X_AUDIO_HAPTICS_MAX_OUT_VOLT },
298 	{ DRV260X_FEEDBACK_CTRL, DRV260X_BRAKE_FACTOR_3X |
299 		DRV260X_LOOP_GAIN_MED | DRV260X_BEMF_GAIN_2 },
300 	{ DRV260X_CTRL1, DRV260X_STARTUP_BOOST },
301 	{ DRV260X_CTRL2, DRV260X_SAMP_TIME_250 | DRV260X_BLANK_TIME_75 |
302 		DRV260X_IDISS_TIME_75 },
303 	{ DRV260X_CTRL3, DRV260X_NG_THRESH_2 | DRV260X_RTP_UNSIGNED_DATA },
304 	{ DRV260X_CTRL4, DRV260X_AUTOCAL_TIME_500MS },
305 };
306 
drv260x_init(struct drv260x_data * haptics)307 static int drv260x_init(struct drv260x_data *haptics)
308 {
309 	int error;
310 	unsigned int cal_buf;
311 
312 	error = regmap_write(haptics->regmap,
313 			     DRV260X_RATED_VOLT, haptics->rated_voltage);
314 	if (error) {
315 		dev_err(&haptics->client->dev,
316 			"Failed to write DRV260X_RATED_VOLT register: %d\n",
317 			error);
318 		return error;
319 	}
320 
321 	error = regmap_write(haptics->regmap,
322 			     DRV260X_OD_CLAMP_VOLT, haptics->overdrive_voltage);
323 	if (error) {
324 		dev_err(&haptics->client->dev,
325 			"Failed to write DRV260X_OD_CLAMP_VOLT register: %d\n",
326 			error);
327 		return error;
328 	}
329 
330 	switch (haptics->mode) {
331 	case DRV260X_LRA_MODE:
332 		error = regmap_register_patch(haptics->regmap,
333 					      drv260x_lra_cal_regs,
334 					      ARRAY_SIZE(drv260x_lra_cal_regs));
335 		if (error) {
336 			dev_err(&haptics->client->dev,
337 				"Failed to write LRA calibration registers: %d\n",
338 				error);
339 			return error;
340 		}
341 
342 		break;
343 
344 	case DRV260X_ERM_MODE:
345 		error = regmap_register_patch(haptics->regmap,
346 					      drv260x_erm_cal_regs,
347 					      ARRAY_SIZE(drv260x_erm_cal_regs));
348 		if (error) {
349 			dev_err(&haptics->client->dev,
350 				"Failed to write ERM calibration registers: %d\n",
351 				error);
352 			return error;
353 		}
354 
355 		error = regmap_update_bits(haptics->regmap, DRV260X_LIB_SEL,
356 					   DRV260X_LIB_SEL_MASK,
357 					   haptics->library);
358 		if (error) {
359 			dev_err(&haptics->client->dev,
360 				"Failed to write DRV260X_LIB_SEL register: %d\n",
361 				error);
362 			return error;
363 		}
364 
365 		break;
366 
367 	default:
368 		error = regmap_register_patch(haptics->regmap,
369 					      drv260x_lra_init_regs,
370 					      ARRAY_SIZE(drv260x_lra_init_regs));
371 		if (error) {
372 			dev_err(&haptics->client->dev,
373 				"Failed to write LRA init registers: %d\n",
374 				error);
375 			return error;
376 		}
377 
378 		error = regmap_update_bits(haptics->regmap, DRV260X_LIB_SEL,
379 					   DRV260X_LIB_SEL_MASK,
380 					   haptics->library);
381 		if (error) {
382 			dev_err(&haptics->client->dev,
383 				"Failed to write DRV260X_LIB_SEL register: %d\n",
384 				error);
385 			return error;
386 		}
387 
388 		/* No need to set GO bit here */
389 		return 0;
390 	}
391 
392 	error = regmap_write(haptics->regmap, DRV260X_GO, DRV260X_GO_BIT);
393 	if (error) {
394 		dev_err(&haptics->client->dev,
395 			"Failed to write GO register: %d\n",
396 			error);
397 		return error;
398 	}
399 
400 	do {
401 		usleep_range(15000, 15500);
402 		error = regmap_read(haptics->regmap, DRV260X_GO, &cal_buf);
403 		if (error) {
404 			dev_err(&haptics->client->dev,
405 				"Failed to read GO register: %d\n",
406 				error);
407 			return error;
408 		}
409 	} while (cal_buf == DRV260X_GO_BIT);
410 
411 	return 0;
412 }
413 
414 static const struct regmap_config drv260x_regmap_config = {
415 	.reg_bits = 8,
416 	.val_bits = 8,
417 
418 	.max_register = DRV260X_MAX_REG,
419 	.cache_type = REGCACHE_NONE,
420 };
421 
drv260x_probe(struct i2c_client * client)422 static int drv260x_probe(struct i2c_client *client)
423 {
424 	struct device *dev = &client->dev;
425 	struct drv260x_data *haptics;
426 	u32 voltage;
427 	int error;
428 
429 	haptics = devm_kzalloc(dev, sizeof(*haptics), GFP_KERNEL);
430 	if (!haptics)
431 		return -ENOMEM;
432 
433 	error = device_property_read_u32(dev, "mode", &haptics->mode);
434 	if (error) {
435 		dev_err(dev, "Can't fetch 'mode' property: %d\n", error);
436 		return error;
437 	}
438 
439 	if (haptics->mode < DRV260X_LRA_MODE ||
440 	    haptics->mode > DRV260X_ERM_MODE) {
441 		dev_err(dev, "Vibrator mode is invalid: %i\n", haptics->mode);
442 		return -EINVAL;
443 	}
444 
445 	error = device_property_read_u32(dev, "library-sel", &haptics->library);
446 	if (error) {
447 		dev_err(dev, "Can't fetch 'library-sel' property: %d\n", error);
448 		return error;
449 	}
450 
451 	if (haptics->library < DRV260X_LIB_EMPTY ||
452 	    haptics->library > DRV260X_ERM_LIB_F) {
453 		dev_err(dev,
454 			"Library value is invalid: %i\n", haptics->library);
455 		return -EINVAL;
456 	}
457 
458 	if (haptics->mode == DRV260X_LRA_MODE &&
459 	    haptics->library != DRV260X_LIB_EMPTY &&
460 	    haptics->library != DRV260X_LIB_LRA) {
461 		dev_err(dev, "LRA Mode with ERM Library mismatch\n");
462 		return -EINVAL;
463 	}
464 
465 	if (haptics->mode == DRV260X_ERM_MODE &&
466 	    (haptics->library == DRV260X_LIB_EMPTY ||
467 	     haptics->library == DRV260X_LIB_LRA)) {
468 		dev_err(dev, "ERM Mode with LRA Library mismatch\n");
469 		return -EINVAL;
470 	}
471 
472 	error = device_property_read_u32(dev, "vib-rated-mv", &voltage);
473 	haptics->rated_voltage = error ? DRV260X_DEF_RATED_VOLT :
474 					 drv260x_calculate_voltage(voltage);
475 
476 	error = device_property_read_u32(dev, "vib-overdrive-mv", &voltage);
477 	haptics->overdrive_voltage = error ? DRV260X_DEF_OD_CLAMP_VOLT :
478 					     drv260x_calculate_voltage(voltage);
479 
480 	haptics->regulator = devm_regulator_get(dev, "vbat");
481 	if (IS_ERR(haptics->regulator)) {
482 		error = PTR_ERR(haptics->regulator);
483 		dev_err(dev, "unable to get regulator, error: %d\n", error);
484 		return error;
485 	}
486 
487 	haptics->enable_gpio = devm_gpiod_get_optional(dev, "enable",
488 						       GPIOD_OUT_HIGH);
489 	if (IS_ERR(haptics->enable_gpio))
490 		return PTR_ERR(haptics->enable_gpio);
491 
492 	haptics->input_dev = devm_input_allocate_device(dev);
493 	if (!haptics->input_dev) {
494 		dev_err(dev, "Failed to allocate input device\n");
495 		return -ENOMEM;
496 	}
497 
498 	haptics->input_dev->name = "drv260x:haptics";
499 	haptics->input_dev->close = drv260x_close;
500 	input_set_drvdata(haptics->input_dev, haptics);
501 	input_set_capability(haptics->input_dev, EV_FF, FF_RUMBLE);
502 
503 	error = input_ff_create_memless(haptics->input_dev, NULL,
504 					drv260x_haptics_play);
505 	if (error) {
506 		dev_err(dev, "input_ff_create() failed: %d\n", error);
507 		return error;
508 	}
509 
510 	INIT_WORK(&haptics->work, drv260x_worker);
511 
512 	haptics->client = client;
513 	i2c_set_clientdata(client, haptics);
514 
515 	haptics->regmap = devm_regmap_init_i2c(client, &drv260x_regmap_config);
516 	if (IS_ERR(haptics->regmap)) {
517 		error = PTR_ERR(haptics->regmap);
518 		dev_err(dev, "Failed to allocate register map: %d\n", error);
519 		return error;
520 	}
521 
522 	error = drv260x_init(haptics);
523 	if (error) {
524 		dev_err(dev, "Device init failed: %d\n", error);
525 		return error;
526 	}
527 
528 	error = input_register_device(haptics->input_dev);
529 	if (error) {
530 		dev_err(dev, "couldn't register input device: %d\n", error);
531 		return error;
532 	}
533 
534 	return 0;
535 }
536 
drv260x_suspend(struct device * dev)537 static int drv260x_suspend(struct device *dev)
538 {
539 	struct drv260x_data *haptics = dev_get_drvdata(dev);
540 	int ret = 0;
541 
542 	mutex_lock(&haptics->input_dev->mutex);
543 
544 	if (input_device_enabled(haptics->input_dev)) {
545 		ret = regmap_update_bits(haptics->regmap,
546 					 DRV260X_MODE,
547 					 DRV260X_STANDBY_MASK,
548 					 DRV260X_STANDBY);
549 		if (ret) {
550 			dev_err(dev, "Failed to set standby mode\n");
551 			goto out;
552 		}
553 
554 		gpiod_set_value(haptics->enable_gpio, 0);
555 
556 		ret = regulator_disable(haptics->regulator);
557 		if (ret) {
558 			dev_err(dev, "Failed to disable regulator\n");
559 			regmap_update_bits(haptics->regmap,
560 					   DRV260X_MODE,
561 					   DRV260X_STANDBY_MASK, 0);
562 		}
563 	}
564 out:
565 	mutex_unlock(&haptics->input_dev->mutex);
566 	return ret;
567 }
568 
drv260x_resume(struct device * dev)569 static int drv260x_resume(struct device *dev)
570 {
571 	struct drv260x_data *haptics = dev_get_drvdata(dev);
572 	int ret = 0;
573 
574 	mutex_lock(&haptics->input_dev->mutex);
575 
576 	if (input_device_enabled(haptics->input_dev)) {
577 		ret = regulator_enable(haptics->regulator);
578 		if (ret) {
579 			dev_err(dev, "Failed to enable regulator\n");
580 			goto out;
581 		}
582 
583 		ret = regmap_update_bits(haptics->regmap,
584 					 DRV260X_MODE,
585 					 DRV260X_STANDBY_MASK, 0);
586 		if (ret) {
587 			dev_err(dev, "Failed to unset standby mode\n");
588 			regulator_disable(haptics->regulator);
589 			goto out;
590 		}
591 
592 		gpiod_set_value(haptics->enable_gpio, 1);
593 	}
594 
595 out:
596 	mutex_unlock(&haptics->input_dev->mutex);
597 	return ret;
598 }
599 
600 static DEFINE_SIMPLE_DEV_PM_OPS(drv260x_pm_ops, drv260x_suspend, drv260x_resume);
601 
602 static const struct i2c_device_id drv260x_id[] = {
603 	{ "drv2605l", 0 },
604 	{ }
605 };
606 MODULE_DEVICE_TABLE(i2c, drv260x_id);
607 
608 static const struct of_device_id drv260x_of_match[] = {
609 	{ .compatible = "ti,drv2604", },
610 	{ .compatible = "ti,drv2604l", },
611 	{ .compatible = "ti,drv2605", },
612 	{ .compatible = "ti,drv2605l", },
613 	{ }
614 };
615 MODULE_DEVICE_TABLE(of, drv260x_of_match);
616 
617 static struct i2c_driver drv260x_driver = {
618 	.probe		= drv260x_probe,
619 	.driver		= {
620 		.name	= "drv260x-haptics",
621 		.of_match_table = drv260x_of_match,
622 		.pm	= pm_sleep_ptr(&drv260x_pm_ops),
623 	},
624 	.id_table = drv260x_id,
625 };
626 module_i2c_driver(drv260x_driver);
627 
628 MODULE_DESCRIPTION("TI DRV260x haptics driver");
629 MODULE_LICENSE("GPL");
630 MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");
631