xref: /openbmc/linux/drivers/input/misc/drv260x.c (revision 2612e3bbc0386368a850140a6c9b990cd496a5ec)
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