drivers/input/misc/drv260x.c - linux - Git at Google

 /*
  * DRV260X 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/regmap.h>
 #include <linux/slab.h>
 #include <linux/delay.h>
 #include <linux/gpio/consumer.h>
 #include <linux/regulator/consumer.h>

 #include <dt-bindings/input/ti-drv260x.h>

 #define DRV260X_STATUS		0x0
 #define DRV260X_MODE		0x1
 #define DRV260X_RT_PB_IN	0x2
 #define DRV260X_LIB_SEL		0x3
 #define DRV260X_WV_SEQ_1	0x4
 #define DRV260X_WV_SEQ_2	0x5
 #define DRV260X_WV_SEQ_3	0x6
 #define DRV260X_WV_SEQ_4	0x7
 #define DRV260X_WV_SEQ_5	0x8
 #define DRV260X_WV_SEQ_6	0x9
 #define DRV260X_WV_SEQ_7	0xa
 #define DRV260X_WV_SEQ_8	0xb
 #define DRV260X_GO				0xc
 #define DRV260X_OVERDRIVE_OFF	0xd
 #define DRV260X_SUSTAIN_P_OFF	0xe
 #define DRV260X_SUSTAIN_N_OFF	0xf
 #define DRV260X_BRAKE_OFF		0x10
 #define DRV260X_A_TO_V_CTRL		0x11
 #define DRV260X_A_TO_V_MIN_INPUT	0x12
 #define DRV260X_A_TO_V_MAX_INPUT	0x13
 #define DRV260X_A_TO_V_MIN_OUT	0x14
 #define DRV260X_A_TO_V_MAX_OUT	0x15
 #define DRV260X_RATED_VOLT		0x16
 #define DRV260X_OD_CLAMP_VOLT	0x17
 #define DRV260X_CAL_COMP		0x18
 #define DRV260X_CAL_BACK_EMF	0x19
 #define DRV260X_FEEDBACK_CTRL	0x1a
 #define DRV260X_CTRL1			0x1b
 #define DRV260X_CTRL2			0x1c
 #define DRV260X_CTRL3			0x1d
 #define DRV260X_CTRL4			0x1e
 #define DRV260X_CTRL5			0x1f
 #define DRV260X_LRA_LOOP_PERIOD	0x20
 #define DRV260X_VBAT_MON		0x21
 #define DRV260X_LRA_RES_PERIOD	0x22
 #define DRV260X_MAX_REG			0x23

 #define DRV260X_GO_BIT				0x01

 /* Library Selection */
 #define DRV260X_LIB_SEL_MASK		0x07
 #define DRV260X_LIB_SEL_RAM			0x0
 #define DRV260X_LIB_SEL_OD			0x1
 #define DRV260X_LIB_SEL_40_60		0x2
 #define DRV260X_LIB_SEL_60_80		0x3
 #define DRV260X_LIB_SEL_100_140		0x4
 #define DRV260X_LIB_SEL_140_PLUS	0x5

 #define DRV260X_LIB_SEL_HIZ_MASK	0x10
 #define DRV260X_LIB_SEL_HIZ_EN		0x01
 #define DRV260X_LIB_SEL_HIZ_DIS		0

 /* Mode register */
 #define DRV260X_STANDBY				(1 << 6)
 #define DRV260X_STANDBY_MASK		0x40
 #define DRV260X_INTERNAL_TRIGGER	0x00
 #define DRV260X_EXT_TRIGGER_EDGE	0x01
 #define DRV260X_EXT_TRIGGER_LEVEL	0x02
 #define DRV260X_PWM_ANALOG_IN		0x03
 #define DRV260X_AUDIOHAPTIC			0x04
 #define DRV260X_RT_PLAYBACK			0x05
 #define DRV260X_DIAGNOSTICS			0x06
 #define DRV260X_AUTO_CAL			0x07

 /* Audio to Haptics Control */
 #define DRV260X_AUDIO_HAPTICS_PEAK_10MS		(0 << 2)
 #define DRV260X_AUDIO_HAPTICS_PEAK_20MS		(1 << 2)
 #define DRV260X_AUDIO_HAPTICS_PEAK_30MS		(2 << 2)
 #define DRV260X_AUDIO_HAPTICS_PEAK_40MS		(3 << 2)

 #define DRV260X_AUDIO_HAPTICS_FILTER_100HZ	0x00
 #define DRV260X_AUDIO_HAPTICS_FILTER_125HZ	0x01
 #define DRV260X_AUDIO_HAPTICS_FILTER_150HZ	0x02
 #define DRV260X_AUDIO_HAPTICS_FILTER_200HZ	0x03

 /* Min/Max Input/Output Voltages */
 #define DRV260X_AUDIO_HAPTICS_MIN_IN_VOLT	0x19
 #define DRV260X_AUDIO_HAPTICS_MAX_IN_VOLT	0x64
 #define DRV260X_AUDIO_HAPTICS_MIN_OUT_VOLT	0x19
 #define DRV260X_AUDIO_HAPTICS_MAX_OUT_VOLT	0xFF

 /* Feedback register */
 #define DRV260X_FB_REG_ERM_MODE			0x7f
 #define DRV260X_FB_REG_LRA_MODE			(1 << 7)

 #define DRV260X_BRAKE_FACTOR_MASK	0x1f
 #define DRV260X_BRAKE_FACTOR_2X		(1 << 0)
 #define DRV260X_BRAKE_FACTOR_3X		(2 << 4)
 #define DRV260X_BRAKE_FACTOR_4X		(3 << 4)
 #define DRV260X_BRAKE_FACTOR_6X		(4 << 4)
 #define DRV260X_BRAKE_FACTOR_8X		(5 << 4)
 #define DRV260X_BRAKE_FACTOR_16		(6 << 4)
 #define DRV260X_BRAKE_FACTOR_DIS	(7 << 4)

 #define DRV260X_LOOP_GAIN_LOW		0xf3
 #define DRV260X_LOOP_GAIN_MED		(1 << 2)
 #define DRV260X_LOOP_GAIN_HIGH		(2 << 2)
 #define DRV260X_LOOP_GAIN_VERY_HIGH	(3 << 2)

 #define DRV260X_BEMF_GAIN_0			0xfc
 #define DRV260X_BEMF_GAIN_1		(1 << 0)
 #define DRV260X_BEMF_GAIN_2		(2 << 0)
 #define DRV260X_BEMF_GAIN_3		(3 << 0)

 /* Control 1 register */
 #define DRV260X_AC_CPLE_EN			(1 << 5)
 #define DRV260X_STARTUP_BOOST		(1 << 7)

 /* Control 2 register */

 #define DRV260X_IDISS_TIME_45		0
 #define DRV260X_IDISS_TIME_75		(1 << 0)
 #define DRV260X_IDISS_TIME_150		(1 << 1)
 #define DRV260X_IDISS_TIME_225		0x03

 #define DRV260X_BLANK_TIME_45	(0 << 2)
 #define DRV260X_BLANK_TIME_75	(1 << 2)
 #define DRV260X_BLANK_TIME_150	(2 << 2)
 #define DRV260X_BLANK_TIME_225	(3 << 2)

 #define DRV260X_SAMP_TIME_150	(0 << 4)
 #define DRV260X_SAMP_TIME_200	(1 << 4)
 #define DRV260X_SAMP_TIME_250	(2 << 4)
 #define DRV260X_SAMP_TIME_300	(3 << 4)

 #define DRV260X_BRAKE_STABILIZER	(1 << 6)
 #define DRV260X_UNIDIR_IN			(0 << 7)
 #define DRV260X_BIDIR_IN			(1 << 7)

 /* Control 3 Register */
 #define DRV260X_LRA_OPEN_LOOP		(1 << 0)
 #define DRV260X_ANANLOG_IN			(1 << 1)
 #define DRV260X_LRA_DRV_MODE		(1 << 2)
 #define DRV260X_RTP_UNSIGNED_DATA	(1 << 3)
 #define DRV260X_SUPPLY_COMP_DIS		(1 << 4)
 #define DRV260X_ERM_OPEN_LOOP		(1 << 5)
 #define DRV260X_NG_THRESH_0			(0 << 6)
 #define DRV260X_NG_THRESH_2			(1 << 6)
 #define DRV260X_NG_THRESH_4			(2 << 6)
 #define DRV260X_NG_THRESH_8			(3 << 6)

 /* Control 4 Register */
 #define DRV260X_AUTOCAL_TIME_150MS		(0 << 4)
 #define DRV260X_AUTOCAL_TIME_250MS		(1 << 4)
 #define DRV260X_AUTOCAL_TIME_500MS		(2 << 4)
 #define DRV260X_AUTOCAL_TIME_1000MS		(3 << 4)

 /**
  * struct drv260x_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
  * @enable_gpio - Pointer to the gpio used for enable/disabling
  * @regulator - Pointer to the regulator for the IC
  * @magnitude - Magnitude of the vibration event
  * @mode - The operating mode of the IC (LRA_NO_CAL, ERM or LRA)
  * @library - The vibration library to be used
  * @rated_voltage - The rated_voltage of the actuator
  * @overdriver_voltage - The over drive voltage of the actuator
 **/
 struct drv260x_data {
 	struct input_dev *input_dev;
 	struct i2c_client *client;
 	struct regmap *regmap;
 	struct work_struct work;
 	struct gpio_desc *enable_gpio;
 	struct regulator *regulator;
 	u32 magnitude;
 	u32 mode;
 	u32 library;
 	int rated_voltage;
 	int overdrive_voltage;
 };

 static const struct reg_default drv260x_reg_defs[] = {
 	{ DRV260X_STATUS, 0xe0 },
 	{ DRV260X_MODE, 0x40 },
 	{ DRV260X_RT_PB_IN, 0x00 },
 	{ DRV260X_LIB_SEL, 0x00 },
 	{ DRV260X_WV_SEQ_1, 0x01 },
 	{ DRV260X_WV_SEQ_2, 0x00 },
 	{ DRV260X_WV_SEQ_3, 0x00 },
 	{ DRV260X_WV_SEQ_4, 0x00 },
 	{ DRV260X_WV_SEQ_5, 0x00 },
 	{ DRV260X_WV_SEQ_6, 0x00 },
 	{ DRV260X_WV_SEQ_7, 0x00 },
 	{ DRV260X_WV_SEQ_8, 0x00 },
 	{ DRV260X_GO, 0x00 },
 	{ DRV260X_OVERDRIVE_OFF, 0x00 },
 	{ DRV260X_SUSTAIN_P_OFF, 0x00 },
 	{ DRV260X_SUSTAIN_N_OFF, 0x00 },
 	{ DRV260X_BRAKE_OFF, 0x00 },
 	{ DRV260X_A_TO_V_CTRL, 0x05 },
 	{ DRV260X_A_TO_V_MIN_INPUT, 0x19 },
 	{ DRV260X_A_TO_V_MAX_INPUT, 0xff },
 	{ DRV260X_A_TO_V_MIN_OUT, 0x19 },
 	{ DRV260X_A_TO_V_MAX_OUT, 0xff },
 	{ DRV260X_RATED_VOLT, 0x3e },
 	{ DRV260X_OD_CLAMP_VOLT, 0x8c },
 	{ DRV260X_CAL_COMP, 0x0c },
 	{ DRV260X_CAL_BACK_EMF, 0x6c },
 	{ DRV260X_FEEDBACK_CTRL, 0x36 },
 	{ DRV260X_CTRL1, 0x93 },
 	{ DRV260X_CTRL2, 0xfa },
 	{ DRV260X_CTRL3, 0xa0 },
 	{ DRV260X_CTRL4, 0x20 },
 	{ DRV260X_CTRL5, 0x80 },
 	{ DRV260X_LRA_LOOP_PERIOD, 0x33 },
 	{ DRV260X_VBAT_MON, 0x00 },
 	{ DRV260X_LRA_RES_PERIOD, 0x00 },
 };

 #define DRV260X_DEF_RATED_VOLT		0x90
 #define DRV260X_DEF_OD_CLAMP_VOLT	0x90

 /**
  * Rated and Overdriver Voltages:
  * Calculated using the formula r = v * 255 / 5.6
  * where r is what will be written to the register
  * and v is the rated or overdriver voltage of the actuator
  **/
 static int drv260x_calculate_voltage(unsigned int voltage)
 {
 	return (voltage * 255 / 5600);
 }

 static void drv260x_worker(struct work_struct *work)
 {
 	struct drv260x_data *haptics = container_of(work, struct drv260x_data, work);
 	int error;

 	gpiod_set_value(haptics->enable_gpio, 1);
 	/* Data sheet says to wait 250us before trying to communicate */
 	udelay(250);

 	error = regmap_write(haptics->regmap,
 			     DRV260X_MODE, DRV260X_RT_PLAYBACK);
 	if (error) {
 		dev_err(&haptics->client->dev,
 			"Failed to write set mode: %d\n", error);
 	} else {
 		error = regmap_write(haptics->regmap,
 				     DRV260X_RT_PB_IN, haptics->magnitude);
 		if (error)
 			dev_err(&haptics->client->dev,
 				"Failed to set magnitude: %d\n", error);
 	}
 }

 static int drv260x_haptics_play(struct input_dev *input, void *data,
 				struct ff_effect *effect)
 {
 	struct drv260x_data *haptics = input_get_drvdata(input);

 	haptics->mode = DRV260X_LRA_NO_CAL_MODE;

 	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 drv260x_close(struct input_dev *input)
 {
 	struct drv260x_data *haptics = input_get_drvdata(input);
 	int error;

 	cancel_work_sync(&haptics->work);

 	error = regmap_write(haptics->regmap, DRV260X_MODE, DRV260X_STANDBY);
 	if (error)
 		dev_err(&haptics->client->dev,
 			"Failed to enter standby mode: %d\n", error);

 	gpiod_set_value(haptics->enable_gpio, 0);
 }

 static const struct reg_sequence drv260x_lra_cal_regs[] = {
 	{ DRV260X_MODE, DRV260X_AUTO_CAL },
 	{ DRV260X_CTRL3, DRV260X_NG_THRESH_2 },
 	{ DRV260X_FEEDBACK_CTRL, DRV260X_FB_REG_LRA_MODE |
 		DRV260X_BRAKE_FACTOR_4X | DRV260X_LOOP_GAIN_HIGH },
 };

 static const struct reg_sequence drv260x_lra_init_regs[] = {
 	{ DRV260X_MODE, DRV260X_RT_PLAYBACK },
 	{ DRV260X_A_TO_V_CTRL, DRV260X_AUDIO_HAPTICS_PEAK_20MS |
 		DRV260X_AUDIO_HAPTICS_FILTER_125HZ },
 	{ DRV260X_A_TO_V_MIN_INPUT, DRV260X_AUDIO_HAPTICS_MIN_IN_VOLT },
 	{ DRV260X_A_TO_V_MAX_INPUT, DRV260X_AUDIO_HAPTICS_MAX_IN_VOLT },
 	{ DRV260X_A_TO_V_MIN_OUT, DRV260X_AUDIO_HAPTICS_MIN_OUT_VOLT },
 	{ DRV260X_A_TO_V_MAX_OUT, DRV260X_AUDIO_HAPTICS_MAX_OUT_VOLT },
 	{ DRV260X_FEEDBACK_CTRL, DRV260X_FB_REG_LRA_MODE |
 		DRV260X_BRAKE_FACTOR_2X | DRV260X_LOOP_GAIN_MED |
 		DRV260X_BEMF_GAIN_3 },
 	{ DRV260X_CTRL1, DRV260X_STARTUP_BOOST },
 	{ DRV260X_CTRL2, DRV260X_SAMP_TIME_250 },
 	{ DRV260X_CTRL3, DRV260X_NG_THRESH_2 | DRV260X_ANANLOG_IN },
 	{ DRV260X_CTRL4, DRV260X_AUTOCAL_TIME_500MS },
 };

 static const struct reg_sequence drv260x_erm_cal_regs[] = {
 	{ DRV260X_MODE, DRV260X_AUTO_CAL },
 	{ DRV260X_A_TO_V_MIN_INPUT, DRV260X_AUDIO_HAPTICS_MIN_IN_VOLT },
 	{ DRV260X_A_TO_V_MAX_INPUT, DRV260X_AUDIO_HAPTICS_MAX_IN_VOLT },
 	{ DRV260X_A_TO_V_MIN_OUT, DRV260X_AUDIO_HAPTICS_MIN_OUT_VOLT },
 	{ DRV260X_A_TO_V_MAX_OUT, DRV260X_AUDIO_HAPTICS_MAX_OUT_VOLT },
 	{ DRV260X_FEEDBACK_CTRL, DRV260X_BRAKE_FACTOR_3X |
 		DRV260X_LOOP_GAIN_MED | DRV260X_BEMF_GAIN_2 },
 	{ DRV260X_CTRL1, DRV260X_STARTUP_BOOST },
 	{ DRV260X_CTRL2, DRV260X_SAMP_TIME_250 | DRV260X_BLANK_TIME_75 |
 		DRV260X_IDISS_TIME_75 },
 	{ DRV260X_CTRL3, DRV260X_NG_THRESH_2 | DRV260X_ERM_OPEN_LOOP },
 	{ DRV260X_CTRL4, DRV260X_AUTOCAL_TIME_500MS },
 };

 static int drv260x_init(struct drv260x_data *haptics)
 {
 	int error;
 	unsigned int cal_buf;

 	error = regmap_write(haptics->regmap,
 			     DRV260X_RATED_VOLT, haptics->rated_voltage);
 	if (error) {
 		dev_err(&haptics->client->dev,
 			"Failed to write DRV260X_RATED_VOLT register: %d\n",
 			error);
 		return error;
 	}

 	error = regmap_write(haptics->regmap,
 			     DRV260X_OD_CLAMP_VOLT, haptics->overdrive_voltage);
 	if (error) {
 		dev_err(&haptics->client->dev,
 			"Failed to write DRV260X_OD_CLAMP_VOLT register: %d\n",
 			error);
 		return error;
 	}

 	switch (haptics->mode) {
 	case DRV260X_LRA_MODE:
 		error = regmap_register_patch(haptics->regmap,
 					      drv260x_lra_cal_regs,
 					      ARRAY_SIZE(drv260x_lra_cal_regs));
 		if (error) {
 			dev_err(&haptics->client->dev,
 				"Failed to write LRA calibration registers: %d\n",
 				error);
 			return error;
 		}

 		break;

 	case DRV260X_ERM_MODE:
 		error = regmap_register_patch(haptics->regmap,
 					      drv260x_erm_cal_regs,
 					      ARRAY_SIZE(drv260x_erm_cal_regs));
 		if (error) {
 			dev_err(&haptics->client->dev,
 				"Failed to write ERM calibration registers: %d\n",
 				error);
 			return error;
 		}

 		error = regmap_update_bits(haptics->regmap, DRV260X_LIB_SEL,
 					   DRV260X_LIB_SEL_MASK,
 					   haptics->library);
 		if (error) {
 			dev_err(&haptics->client->dev,
 				"Failed to write DRV260X_LIB_SEL register: %d\n",
 				error);
 			return error;
 		}

 		break;

 	default:
 		error = regmap_register_patch(haptics->regmap,
 					      drv260x_lra_init_regs,
 					      ARRAY_SIZE(drv260x_lra_init_regs));
 		if (error) {
 			dev_err(&haptics->client->dev,
 				"Failed to write LRA init registers: %d\n",
 				error);
 			return error;
 		}

 		error = regmap_update_bits(haptics->regmap, DRV260X_LIB_SEL,
 					   DRV260X_LIB_SEL_MASK,
 					   haptics->library);
 		if (error) {
 			dev_err(&haptics->client->dev,
 				"Failed to write DRV260X_LIB_SEL register: %d\n",
 				error);
 			return error;
 		}

 		/* No need to set GO bit here */
 		return 0;
 	}

 	error = regmap_write(haptics->regmap, DRV260X_GO, DRV260X_GO_BIT);
 	if (error) {
 		dev_err(&haptics->client->dev,
 			"Failed to write GO register: %d\n",
 			error);
 		return error;
 	}

 	do {
 		error = regmap_read(haptics->regmap, DRV260X_GO, &cal_buf);
 		if (error) {
 			dev_err(&haptics->client->dev,
 				"Failed to read GO register: %d\n",
 				error);
 			return error;
 		}
 	} while (cal_buf == DRV260X_GO_BIT);

 	return 0;
 }

 static const struct regmap_config drv260x_regmap_config = {
 	.reg_bits = 8,
 	.val_bits = 8,

 	.max_register = DRV260X_MAX_REG,
 	.reg_defaults = drv260x_reg_defs,
 	.num_reg_defaults = ARRAY_SIZE(drv260x_reg_defs),
 	.cache_type = REGCACHE_NONE,
 };

 static int drv260x_probe(struct i2c_client *client,
 			 const struct i2c_device_id *id)
 {
 	struct device *dev = &client->dev;
 	struct drv260x_data *haptics;
 	u32 voltage;
 	int error;

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

 	error = device_property_read_u32(dev, "mode", &haptics->mode);
 	if (error) {
 		dev_err(dev, "Can't fetch 'mode' property: %d\n", error);
 		return error;
 	}

 	if (haptics->mode < DRV260X_LRA_MODE ||
 	    haptics->mode > DRV260X_ERM_MODE) {
 		dev_err(dev, "Vibrator mode is invalid: %i\n", haptics->mode);
 		return -EINVAL;
 	}

 	error = device_property_read_u32(dev, "library-sel", &haptics->library);
 	if (error) {
 		dev_err(dev, "Can't fetch 'library-sel' property: %d\n", error);
 		return error;
 	}

 	if (haptics->library < DRV260X_LIB_EMPTY ||
 	    haptics->library > DRV260X_ERM_LIB_F) {
 		dev_err(dev,
 			"Library value is invalid: %i\n", haptics->library);
 		return -EINVAL;
 	}

 	if (haptics->mode == DRV260X_LRA_MODE &&
 	    haptics->library != DRV260X_LIB_EMPTY &&
 	    haptics->library != DRV260X_LIB_LRA) {
 		dev_err(dev, "LRA Mode with ERM Library mismatch\n");
 		return -EINVAL;
 	}

 	if (haptics->mode == DRV260X_ERM_MODE &&
 	    (haptics->library == DRV260X_LIB_EMPTY ||
 	     haptics->library == DRV260X_LIB_LRA)) {
 		dev_err(dev, "ERM Mode with LRA Library mismatch\n");
 		return -EINVAL;
 	}

 	error = device_property_read_u32(dev, "vib-rated-mv", &voltage);
 	haptics->rated_voltage = error ? DRV260X_DEF_RATED_VOLT :
 					 drv260x_calculate_voltage(voltage);

 	error = device_property_read_u32(dev, "vib-overdrive-mv", &voltage);
 	haptics->overdrive_voltage = error ? DRV260X_DEF_OD_CLAMP_VOLT :
 					     drv260x_calculate_voltage(voltage);

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

 	haptics->enable_gpio = devm_gpiod_get_optional(dev, "enable",
 						       GPIOD_OUT_HIGH);
 	if (IS_ERR(haptics->enable_gpio))
 		return PTR_ERR(haptics->enable_gpio);

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

 	haptics->input_dev->name = "drv260x:haptics";
 	haptics->input_dev->close = drv260x_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,
 					drv260x_haptics_play);
 	if (error) {
 		dev_err(dev, "input_ff_create() failed: %d\n", error);
 		return error;
 	}

 	INIT_WORK(&haptics->work, drv260x_worker);

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

 	haptics->regmap = devm_regmap_init_i2c(client, &drv260x_regmap_config);
 	if (IS_ERR(haptics->regmap)) {
 		error = PTR_ERR(haptics->regmap);
 		dev_err(dev, "Failed to allocate register map: %d\n", error);
 		return error;
 	}

 	error = drv260x_init(haptics);
 	if (error) {
 		dev_err(dev, "Device init failed: %d\n", error);
 		return error;
 	}

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

 	return 0;
 }

 static int __maybe_unused drv260x_suspend(struct device *dev)
 {
 	struct drv260x_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,
 					 DRV260X_MODE,
 					 DRV260X_STANDBY_MASK,
 					 DRV260X_STANDBY);
 		if (ret) {
 			dev_err(dev, "Failed to set standby mode\n");
 			goto out;
 		}

 		gpiod_set_value(haptics->enable_gpio, 0);

 		ret = regulator_disable(haptics->regulator);
 		if (ret) {
 			dev_err(dev, "Failed to disable regulator\n");
 			regmap_update_bits(haptics->regmap,
 					   DRV260X_MODE,
 					   DRV260X_STANDBY_MASK, 0);
 		}
 	}
 out:
 	mutex_unlock(&haptics->input_dev->mutex);
 	return ret;
 }

 static int __maybe_unused drv260x_resume(struct device *dev)
 {
 	struct drv260x_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,
 					 DRV260X_MODE,
 					 DRV260X_STANDBY_MASK, 0);
 		if (ret) {
 			dev_err(dev, "Failed to unset standby mode\n");
 			regulator_disable(haptics->regulator);
 			goto out;
 		}

 		gpiod_set_value(haptics->enable_gpio, 1);
 	}

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

 static SIMPLE_DEV_PM_OPS(drv260x_pm_ops, drv260x_suspend, drv260x_resume);

 static const struct i2c_device_id drv260x_id[] = {
 	{ "drv2605l", 0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, drv260x_id);

 static const struct of_device_id drv260x_of_match[] = {
 	{ .compatible = "ti,drv2604", },
 	{ .compatible = "ti,drv2604l", },
 	{ .compatible = "ti,drv2605", },
 	{ .compatible = "ti,drv2605l", },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, drv260x_of_match);

 static struct i2c_driver drv260x_driver = {
 	.probe		= drv260x_probe,
 	.driver		= {
 		.name	= "drv260x-haptics",
 		.of_match_table = drv260x_of_match,
 		.pm	= &drv260x_pm_ops,
 	},
 	.id_table = drv260x_id,
 };
 module_i2c_driver(drv260x_driver);

 MODULE_DESCRIPTION("TI DRV260x haptics driver");
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");
	/*
	* DRV260X 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/regmap.h>
	#include <linux/slab.h>
	#include <linux/delay.h>
	#include <linux/gpio/consumer.h>
	#include <linux/regulator/consumer.h>

	#include <dt-bindings/input/ti-drv260x.h>

	#define DRV260X_STATUS 0x0
	#define DRV260X_MODE 0x1
	#define DRV260X_RT_PB_IN 0x2
	#define DRV260X_LIB_SEL 0x3
	#define DRV260X_WV_SEQ_1 0x4
	#define DRV260X_WV_SEQ_2 0x5
	#define DRV260X_WV_SEQ_3 0x6
	#define DRV260X_WV_SEQ_4 0x7
	#define DRV260X_WV_SEQ_5 0x8
	#define DRV260X_WV_SEQ_6 0x9
	#define DRV260X_WV_SEQ_7 0xa
	#define DRV260X_WV_SEQ_8 0xb
	#define DRV260X_GO 0xc
	#define DRV260X_OVERDRIVE_OFF 0xd
	#define DRV260X_SUSTAIN_P_OFF 0xe
	#define DRV260X_SUSTAIN_N_OFF 0xf
	#define DRV260X_BRAKE_OFF 0x10
	#define DRV260X_A_TO_V_CTRL 0x11
	#define DRV260X_A_TO_V_MIN_INPUT 0x12
	#define DRV260X_A_TO_V_MAX_INPUT 0x13
	#define DRV260X_A_TO_V_MIN_OUT 0x14
	#define DRV260X_A_TO_V_MAX_OUT 0x15
	#define DRV260X_RATED_VOLT 0x16
	#define DRV260X_OD_CLAMP_VOLT 0x17
	#define DRV260X_CAL_COMP 0x18
	#define DRV260X_CAL_BACK_EMF 0x19
	#define DRV260X_FEEDBACK_CTRL 0x1a
	#define DRV260X_CTRL1 0x1b
	#define DRV260X_CTRL2 0x1c
	#define DRV260X_CTRL3 0x1d
	#define DRV260X_CTRL4 0x1e
	#define DRV260X_CTRL5 0x1f
	#define DRV260X_LRA_LOOP_PERIOD 0x20
	#define DRV260X_VBAT_MON 0x21
	#define DRV260X_LRA_RES_PERIOD 0x22
	#define DRV260X_MAX_REG 0x23

	#define DRV260X_GO_BIT 0x01

	/* Library Selection */
	#define DRV260X_LIB_SEL_MASK 0x07
	#define DRV260X_LIB_SEL_RAM 0x0
	#define DRV260X_LIB_SEL_OD 0x1
	#define DRV260X_LIB_SEL_40_60 0x2
	#define DRV260X_LIB_SEL_60_80 0x3
	#define DRV260X_LIB_SEL_100_140 0x4
	#define DRV260X_LIB_SEL_140_PLUS 0x5

	#define DRV260X_LIB_SEL_HIZ_MASK 0x10
	#define DRV260X_LIB_SEL_HIZ_EN 0x01
	#define DRV260X_LIB_SEL_HIZ_DIS 0

	/* Mode register */
	#define DRV260X_STANDBY (1 << 6)
	#define DRV260X_STANDBY_MASK 0x40
	#define DRV260X_INTERNAL_TRIGGER 0x00
	#define DRV260X_EXT_TRIGGER_EDGE 0x01
	#define DRV260X_EXT_TRIGGER_LEVEL 0x02
	#define DRV260X_PWM_ANALOG_IN 0x03
	#define DRV260X_AUDIOHAPTIC 0x04
	#define DRV260X_RT_PLAYBACK 0x05
	#define DRV260X_DIAGNOSTICS 0x06
	#define DRV260X_AUTO_CAL 0x07

	/* Audio to Haptics Control */
	#define DRV260X_AUDIO_HAPTICS_PEAK_10MS (0 << 2)
	#define DRV260X_AUDIO_HAPTICS_PEAK_20MS (1 << 2)
	#define DRV260X_AUDIO_HAPTICS_PEAK_30MS (2 << 2)
	#define DRV260X_AUDIO_HAPTICS_PEAK_40MS (3 << 2)

	#define DRV260X_AUDIO_HAPTICS_FILTER_100HZ 0x00
	#define DRV260X_AUDIO_HAPTICS_FILTER_125HZ 0x01
	#define DRV260X_AUDIO_HAPTICS_FILTER_150HZ 0x02
	#define DRV260X_AUDIO_HAPTICS_FILTER_200HZ 0x03

	/* Min/Max Input/Output Voltages */
	#define DRV260X_AUDIO_HAPTICS_MIN_IN_VOLT 0x19
	#define DRV260X_AUDIO_HAPTICS_MAX_IN_VOLT 0x64
	#define DRV260X_AUDIO_HAPTICS_MIN_OUT_VOLT 0x19
	#define DRV260X_AUDIO_HAPTICS_MAX_OUT_VOLT 0xFF

	/* Feedback register */
	#define DRV260X_FB_REG_ERM_MODE 0x7f
	#define DRV260X_FB_REG_LRA_MODE (1 << 7)

	#define DRV260X_BRAKE_FACTOR_MASK 0x1f
	#define DRV260X_BRAKE_FACTOR_2X (1 << 0)
	#define DRV260X_BRAKE_FACTOR_3X (2 << 4)
	#define DRV260X_BRAKE_FACTOR_4X (3 << 4)
	#define DRV260X_BRAKE_FACTOR_6X (4 << 4)
	#define DRV260X_BRAKE_FACTOR_8X (5 << 4)
	#define DRV260X_BRAKE_FACTOR_16 (6 << 4)
	#define DRV260X_BRAKE_FACTOR_DIS (7 << 4)

	#define DRV260X_LOOP_GAIN_LOW 0xf3
	#define DRV260X_LOOP_GAIN_MED (1 << 2)
	#define DRV260X_LOOP_GAIN_HIGH (2 << 2)
	#define DRV260X_LOOP_GAIN_VERY_HIGH (3 << 2)

	#define DRV260X_BEMF_GAIN_0 0xfc
	#define DRV260X_BEMF_GAIN_1 (1 << 0)
	#define DRV260X_BEMF_GAIN_2 (2 << 0)
	#define DRV260X_BEMF_GAIN_3 (3 << 0)

	/* Control 1 register */
	#define DRV260X_AC_CPLE_EN (1 << 5)
	#define DRV260X_STARTUP_BOOST (1 << 7)

	/* Control 2 register */

	#define DRV260X_IDISS_TIME_45 0
	#define DRV260X_IDISS_TIME_75 (1 << 0)
	#define DRV260X_IDISS_TIME_150 (1 << 1)
	#define DRV260X_IDISS_TIME_225 0x03

	#define DRV260X_BLANK_TIME_45 (0 << 2)
	#define DRV260X_BLANK_TIME_75 (1 << 2)
	#define DRV260X_BLANK_TIME_150 (2 << 2)
	#define DRV260X_BLANK_TIME_225 (3 << 2)

	#define DRV260X_SAMP_TIME_150 (0 << 4)
	#define DRV260X_SAMP_TIME_200 (1 << 4)
	#define DRV260X_SAMP_TIME_250 (2 << 4)
	#define DRV260X_SAMP_TIME_300 (3 << 4)

	#define DRV260X_BRAKE_STABILIZER (1 << 6)
	#define DRV260X_UNIDIR_IN (0 << 7)
	#define DRV260X_BIDIR_IN (1 << 7)

	/* Control 3 Register */
	#define DRV260X_LRA_OPEN_LOOP (1 << 0)
	#define DRV260X_ANANLOG_IN (1 << 1)
	#define DRV260X_LRA_DRV_MODE (1 << 2)
	#define DRV260X_RTP_UNSIGNED_DATA (1 << 3)
	#define DRV260X_SUPPLY_COMP_DIS (1 << 4)
	#define DRV260X_ERM_OPEN_LOOP (1 << 5)
	#define DRV260X_NG_THRESH_0 (0 << 6)
	#define DRV260X_NG_THRESH_2 (1 << 6)
	#define DRV260X_NG_THRESH_4 (2 << 6)
	#define DRV260X_NG_THRESH_8 (3 << 6)

	/* Control 4 Register */
	#define DRV260X_AUTOCAL_TIME_150MS (0 << 4)
	#define DRV260X_AUTOCAL_TIME_250MS (1 << 4)
	#define DRV260X_AUTOCAL_TIME_500MS (2 << 4)
	#define DRV260X_AUTOCAL_TIME_1000MS (3 << 4)

	/**
	* struct drv260x_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
	* @enable_gpio - Pointer to the gpio used for enable/disabling
	* @regulator - Pointer to the regulator for the IC
	* @magnitude - Magnitude of the vibration event
	* @mode - The operating mode of the IC (LRA_NO_CAL, ERM or LRA)
	* @library - The vibration library to be used
	* @rated_voltage - The rated_voltage of the actuator
	* @overdriver_voltage - The over drive voltage of the actuator
	**/
	struct drv260x_data {
	struct input_dev *input_dev;
	struct i2c_client *client;
	struct regmap *regmap;
	struct work_struct work;
	struct gpio_desc *enable_gpio;
	struct regulator *regulator;
	u32 magnitude;
	u32 mode;
	u32 library;
	int rated_voltage;
	int overdrive_voltage;
	};

	static const struct reg_default drv260x_reg_defs[] = {
	{ DRV260X_STATUS, 0xe0 },
	{ DRV260X_MODE, 0x40 },
	{ DRV260X_RT_PB_IN, 0x00 },
	{ DRV260X_LIB_SEL, 0x00 },
	{ DRV260X_WV_SEQ_1, 0x01 },
	{ DRV260X_WV_SEQ_2, 0x00 },
	{ DRV260X_WV_SEQ_3, 0x00 },
	{ DRV260X_WV_SEQ_4, 0x00 },
	{ DRV260X_WV_SEQ_5, 0x00 },
	{ DRV260X_WV_SEQ_6, 0x00 },
	{ DRV260X_WV_SEQ_7, 0x00 },
	{ DRV260X_WV_SEQ_8, 0x00 },
	{ DRV260X_GO, 0x00 },
	{ DRV260X_OVERDRIVE_OFF, 0x00 },
	{ DRV260X_SUSTAIN_P_OFF, 0x00 },
	{ DRV260X_SUSTAIN_N_OFF, 0x00 },
	{ DRV260X_BRAKE_OFF, 0x00 },
	{ DRV260X_A_TO_V_CTRL, 0x05 },
	{ DRV260X_A_TO_V_MIN_INPUT, 0x19 },
	{ DRV260X_A_TO_V_MAX_INPUT, 0xff },
	{ DRV260X_A_TO_V_MIN_OUT, 0x19 },
	{ DRV260X_A_TO_V_MAX_OUT, 0xff },
	{ DRV260X_RATED_VOLT, 0x3e },
	{ DRV260X_OD_CLAMP_VOLT, 0x8c },
	{ DRV260X_CAL_COMP, 0x0c },
	{ DRV260X_CAL_BACK_EMF, 0x6c },
	{ DRV260X_FEEDBACK_CTRL, 0x36 },
	{ DRV260X_CTRL1, 0x93 },
	{ DRV260X_CTRL2, 0xfa },
	{ DRV260X_CTRL3, 0xa0 },
	{ DRV260X_CTRL4, 0x20 },
	{ DRV260X_CTRL5, 0x80 },
	{ DRV260X_LRA_LOOP_PERIOD, 0x33 },
	{ DRV260X_VBAT_MON, 0x00 },
	{ DRV260X_LRA_RES_PERIOD, 0x00 },
	};

	#define DRV260X_DEF_RATED_VOLT 0x90
	#define DRV260X_DEF_OD_CLAMP_VOLT 0x90

	/**
	* Rated and Overdriver Voltages:
	* Calculated using the formula r = v * 255 / 5.6
	* where r is what will be written to the register
	* and v is the rated or overdriver voltage of the actuator
	**/
	static int drv260x_calculate_voltage(unsigned int voltage)
	{
	return (voltage * 255 / 5600);
	}

	static void drv260x_worker(struct work_struct *work)
	{
	struct drv260x_data *haptics = container_of(work, struct drv260x_data, work);
	int error;

	gpiod_set_value(haptics->enable_gpio, 1);
	/* Data sheet says to wait 250us before trying to communicate */
	udelay(250);

	error = regmap_write(haptics->regmap,
	DRV260X_MODE, DRV260X_RT_PLAYBACK);
	if (error) {
	dev_err(&haptics->client->dev,
	"Failed to write set mode: %d\n", error);
	} else {
	error = regmap_write(haptics->regmap,
	DRV260X_RT_PB_IN, haptics->magnitude);
	if (error)
	dev_err(&haptics->client->dev,
	"Failed to set magnitude: %d\n", error);
	}
	}

	static int drv260x_haptics_play(struct input_dev input, void data,
	struct ff_effect *effect)
	{
	struct drv260x_data *haptics = input_get_drvdata(input);

	haptics->mode = DRV260X_LRA_NO_CAL_MODE;

	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 drv260x_close(struct input_dev *input)
	{
	struct drv260x_data *haptics = input_get_drvdata(input);
	int error;

	cancel_work_sync(&haptics->work);

	error = regmap_write(haptics->regmap, DRV260X_MODE, DRV260X_STANDBY);
	if (error)
	dev_err(&haptics->client->dev,
	"Failed to enter standby mode: %d\n", error);

	gpiod_set_value(haptics->enable_gpio, 0);
	}

	static const struct reg_sequence drv260x_lra_cal_regs[] = {
	{ DRV260X_MODE, DRV260X_AUTO_CAL },
	{ DRV260X_CTRL3, DRV260X_NG_THRESH_2 },
	{ DRV260X_FEEDBACK_CTRL, DRV260X_FB_REG_LRA_MODE \|
	DRV260X_BRAKE_FACTOR_4X \| DRV260X_LOOP_GAIN_HIGH },
	};

	static const struct reg_sequence drv260x_lra_init_regs[] = {
	{ DRV260X_MODE, DRV260X_RT_PLAYBACK },
	{ DRV260X_A_TO_V_CTRL, DRV260X_AUDIO_HAPTICS_PEAK_20MS \|
	DRV260X_AUDIO_HAPTICS_FILTER_125HZ },
	{ DRV260X_A_TO_V_MIN_INPUT, DRV260X_AUDIO_HAPTICS_MIN_IN_VOLT },
	{ DRV260X_A_TO_V_MAX_INPUT, DRV260X_AUDIO_HAPTICS_MAX_IN_VOLT },
	{ DRV260X_A_TO_V_MIN_OUT, DRV260X_AUDIO_HAPTICS_MIN_OUT_VOLT },
	{ DRV260X_A_TO_V_MAX_OUT, DRV260X_AUDIO_HAPTICS_MAX_OUT_VOLT },
	{ DRV260X_FEEDBACK_CTRL, DRV260X_FB_REG_LRA_MODE \|
	DRV260X_BRAKE_FACTOR_2X \| DRV260X_LOOP_GAIN_MED \|
	DRV260X_BEMF_GAIN_3 },
	{ DRV260X_CTRL1, DRV260X_STARTUP_BOOST },
	{ DRV260X_CTRL2, DRV260X_SAMP_TIME_250 },
	{ DRV260X_CTRL3, DRV260X_NG_THRESH_2 \| DRV260X_ANANLOG_IN },
	{ DRV260X_CTRL4, DRV260X_AUTOCAL_TIME_500MS },
	};

	static const struct reg_sequence drv260x_erm_cal_regs[] = {
	{ DRV260X_MODE, DRV260X_AUTO_CAL },
	{ DRV260X_A_TO_V_MIN_INPUT, DRV260X_AUDIO_HAPTICS_MIN_IN_VOLT },
	{ DRV260X_A_TO_V_MAX_INPUT, DRV260X_AUDIO_HAPTICS_MAX_IN_VOLT },
	{ DRV260X_A_TO_V_MIN_OUT, DRV260X_AUDIO_HAPTICS_MIN_OUT_VOLT },
	{ DRV260X_A_TO_V_MAX_OUT, DRV260X_AUDIO_HAPTICS_MAX_OUT_VOLT },
	{ DRV260X_FEEDBACK_CTRL, DRV260X_BRAKE_FACTOR_3X \|
	DRV260X_LOOP_GAIN_MED \| DRV260X_BEMF_GAIN_2 },
	{ DRV260X_CTRL1, DRV260X_STARTUP_BOOST },
	{ DRV260X_CTRL2, DRV260X_SAMP_TIME_250 \| DRV260X_BLANK_TIME_75 \|
	DRV260X_IDISS_TIME_75 },
	{ DRV260X_CTRL3, DRV260X_NG_THRESH_2 \| DRV260X_ERM_OPEN_LOOP },
	{ DRV260X_CTRL4, DRV260X_AUTOCAL_TIME_500MS },
	};

	static int drv260x_init(struct drv260x_data *haptics)
	{
	int error;
	unsigned int cal_buf;

	error = regmap_write(haptics->regmap,
	DRV260X_RATED_VOLT, haptics->rated_voltage);
	if (error) {
	dev_err(&haptics->client->dev,
	"Failed to write DRV260X_RATED_VOLT register: %d\n",
	error);
	return error;
	}

	error = regmap_write(haptics->regmap,
	DRV260X_OD_CLAMP_VOLT, haptics->overdrive_voltage);
	if (error) {
	dev_err(&haptics->client->dev,
	"Failed to write DRV260X_OD_CLAMP_VOLT register: %d\n",
	error);
	return error;
	}

	switch (haptics->mode) {
	case DRV260X_LRA_MODE:
	error = regmap_register_patch(haptics->regmap,
	drv260x_lra_cal_regs,
	ARRAY_SIZE(drv260x_lra_cal_regs));
	if (error) {
	dev_err(&haptics->client->dev,
	"Failed to write LRA calibration registers: %d\n",
	error);
	return error;
	}

	break;

	case DRV260X_ERM_MODE:
	error = regmap_register_patch(haptics->regmap,
	drv260x_erm_cal_regs,
	ARRAY_SIZE(drv260x_erm_cal_regs));
	if (error) {
	dev_err(&haptics->client->dev,
	"Failed to write ERM calibration registers: %d\n",
	error);
	return error;
	}

	error = regmap_update_bits(haptics->regmap, DRV260X_LIB_SEL,
	DRV260X_LIB_SEL_MASK,
	haptics->library);
	if (error) {
	dev_err(&haptics->client->dev,
	"Failed to write DRV260X_LIB_SEL register: %d\n",
	error);
	return error;
	}

	break;

	default:
	error = regmap_register_patch(haptics->regmap,
	drv260x_lra_init_regs,
	ARRAY_SIZE(drv260x_lra_init_regs));
	if (error) {
	dev_err(&haptics->client->dev,
	"Failed to write LRA init registers: %d\n",
	error);
	return error;
	}

	error = regmap_update_bits(haptics->regmap, DRV260X_LIB_SEL,
	DRV260X_LIB_SEL_MASK,
	haptics->library);
	if (error) {
	dev_err(&haptics->client->dev,
	"Failed to write DRV260X_LIB_SEL register: %d\n",
	error);
	return error;
	}

	/* No need to set GO bit here */
	return 0;
	}

	error = regmap_write(haptics->regmap, DRV260X_GO, DRV260X_GO_BIT);
	if (error) {
	dev_err(&haptics->client->dev,
	"Failed to write GO register: %d\n",
	error);
	return error;
	}

	do {
	error = regmap_read(haptics->regmap, DRV260X_GO, &cal_buf);
	if (error) {
	dev_err(&haptics->client->dev,
	"Failed to read GO register: %d\n",
	error);
	return error;
	}
	} while (cal_buf == DRV260X_GO_BIT);

	return 0;
	}

	static const struct regmap_config drv260x_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,

	.max_register = DRV260X_MAX_REG,
	.reg_defaults = drv260x_reg_defs,
	.num_reg_defaults = ARRAY_SIZE(drv260x_reg_defs),
	.cache_type = REGCACHE_NONE,
	};

	static int drv260x_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	struct device *dev = &client->dev;
	struct drv260x_data *haptics;
	u32 voltage;
	int error;

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

	error = device_property_read_u32(dev, "mode", &haptics->mode);
	if (error) {
	dev_err(dev, "Can't fetch 'mode' property: %d\n", error);
	return error;
	}

	if (haptics->mode < DRV260X_LRA_MODE \|\|
	haptics->mode > DRV260X_ERM_MODE) {
	dev_err(dev, "Vibrator mode is invalid: %i\n", haptics->mode);
	return -EINVAL;
	}

	error = device_property_read_u32(dev, "library-sel", &haptics->library);
	if (error) {
	dev_err(dev, "Can't fetch 'library-sel' property: %d\n", error);
	return error;
	}

	if (haptics->library < DRV260X_LIB_EMPTY \|\|
	haptics->library > DRV260X_ERM_LIB_F) {
	dev_err(dev,
	"Library value is invalid: %i\n", haptics->library);
	return -EINVAL;
	}

	if (haptics->mode == DRV260X_LRA_MODE &&
	haptics->library != DRV260X_LIB_EMPTY &&
	haptics->library != DRV260X_LIB_LRA) {
	dev_err(dev, "LRA Mode with ERM Library mismatch\n");
	return -EINVAL;
	}

	if (haptics->mode == DRV260X_ERM_MODE &&
	(haptics->library == DRV260X_LIB_EMPTY \|\|
	haptics->library == DRV260X_LIB_LRA)) {
	dev_err(dev, "ERM Mode with LRA Library mismatch\n");
	return -EINVAL;
	}

	error = device_property_read_u32(dev, "vib-rated-mv", &voltage);
	haptics->rated_voltage = error ? DRV260X_DEF_RATED_VOLT :
	drv260x_calculate_voltage(voltage);

	error = device_property_read_u32(dev, "vib-overdrive-mv", &voltage);
	haptics->overdrive_voltage = error ? DRV260X_DEF_OD_CLAMP_VOLT :
	drv260x_calculate_voltage(voltage);

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

	haptics->enable_gpio = devm_gpiod_get_optional(dev, "enable",
	GPIOD_OUT_HIGH);
	if (IS_ERR(haptics->enable_gpio))
	return PTR_ERR(haptics->enable_gpio);

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

	haptics->input_dev->name = "drv260x:haptics";
	haptics->input_dev->close = drv260x_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,
	drv260x_haptics_play);
	if (error) {
	dev_err(dev, "input_ff_create() failed: %d\n", error);
	return error;
	}

	INIT_WORK(&haptics->work, drv260x_worker);

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

	haptics->regmap = devm_regmap_init_i2c(client, &drv260x_regmap_config);
	if (IS_ERR(haptics->regmap)) {
	error = PTR_ERR(haptics->regmap);
	dev_err(dev, "Failed to allocate register map: %d\n", error);
	return error;
	}

	error = drv260x_init(haptics);
	if (error) {
	dev_err(dev, "Device init failed: %d\n", error);
	return error;
	}

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

	return 0;
	}

	static int __maybe_unused drv260x_suspend(struct device *dev)
	{
	struct drv260x_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,
	DRV260X_MODE,
	DRV260X_STANDBY_MASK,
	DRV260X_STANDBY);
	if (ret) {
	dev_err(dev, "Failed to set standby mode\n");
	goto out;
	}

	gpiod_set_value(haptics->enable_gpio, 0);

	ret = regulator_disable(haptics->regulator);
	if (ret) {
	dev_err(dev, "Failed to disable regulator\n");
	regmap_update_bits(haptics->regmap,
	DRV260X_MODE,
	DRV260X_STANDBY_MASK, 0);
	}
	}
	out:
	mutex_unlock(&haptics->input_dev->mutex);
	return ret;
	}

	static int __maybe_unused drv260x_resume(struct device *dev)
	{
	struct drv260x_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,
	DRV260X_MODE,
	DRV260X_STANDBY_MASK, 0);
	if (ret) {
	dev_err(dev, "Failed to unset standby mode\n");
	regulator_disable(haptics->regulator);
	goto out;
	}

	gpiod_set_value(haptics->enable_gpio, 1);
	}

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

	static SIMPLE_DEV_PM_OPS(drv260x_pm_ops, drv260x_suspend, drv260x_resume);

	static const struct i2c_device_id drv260x_id[] = {
	{ "drv2605l", 0 },
	{ }
	};
	MODULE_DEVICE_TABLE(i2c, drv260x_id);

	static const struct of_device_id drv260x_of_match[] = {
	{ .compatible = "ti,drv2604", },
	{ .compatible = "ti,drv2604l", },
	{ .compatible = "ti,drv2605", },
	{ .compatible = "ti,drv2605l", },
	{ }
	};
	MODULE_DEVICE_TABLE(of, drv260x_of_match);

	static struct i2c_driver drv260x_driver = {
	.probe = drv260x_probe,
	.driver = {
	.name = "drv260x-haptics",
	.of_match_table = drv260x_of_match,
	.pm = &drv260x_pm_ops,
	},
	.id_table = drv260x_id,
	};
	module_i2c_driver(drv260x_driver);

	MODULE_DESCRIPTION("TI DRV260x haptics driver");
	MODULE_LICENSE("GPL");
	MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");