// SPDX-License-Identifier: GPL-2.0-only/* * DRV2665 haptics driver family * * Author: Dan Murphy <dmurphy@ti.com> * * Copyright: (C) 2015 Texas Instruments, Inc. */ #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/regulator/consumer.h> /* Control registers */#define DRV2665_STATUS	0x00#define DRV2665_CTRL_1	0x01#define DRV2665_CTRL_2	0x02#define DRV2665_FIFO	0x0b /* Status Register */#define DRV2665_FIFO_FULL		BIT(0)#define DRV2665_FIFO_EMPTY		BIT(1) /* Control 1 Register */#define DRV2665_25_VPP_GAIN		0x00#define DRV2665_50_VPP_GAIN		0x01#define DRV2665_75_VPP_GAIN		0x02#define DRV2665_100_VPP_GAIN		0x03#define DRV2665_DIGITAL_IN		0xfc#define DRV2665_ANALOG_IN		BIT(2) /* Control 2 Register */#define DRV2665_BOOST_EN		BIT(1)#define DRV2665_STANDBY			BIT(6)#define DRV2665_DEV_RST			BIT(7)#define DRV2665_5_MS_IDLE_TOUT		0x00#define DRV2665_10_MS_IDLE_TOUT		0x04#define DRV2665_15_MS_IDLE_TOUT		0x08#define DRV2665_20_MS_IDLE_TOUT		0x0c /** * struct drv2665_data - * @input_dev: Pointer to the input device * @client: Pointer to the I2C client * @regmap: Register map of the device * @work: Work item used to off load the enable/disable of the vibration * @regulator: Pointer to the regulator for the IC */struct drv2665_data {	struct input_dev *input_dev;	struct i2c_client *client;	struct regmap *regmap;	struct work_struct work;	struct regulator *regulator;}; /* 8kHz Sine wave to stream to the FIFO */static const u8 drv2665_sine_wave_form[] = {	0x00, 0x10, 0x20, 0x2e, 0x3c, 0x48, 0x53, 0x5b, 0x61, 0x65, 0x66,	0x65, 0x61, 0x5b, 0x53, 0x48, 0x3c, 0x2e, 0x20, 0x10,	0x00, 0xf0, 0xe0, 0xd2, 0xc4, 0xb8, 0xad, 0xa5, 0x9f, 0x9b, 0x9a,	0x9b, 0x9f, 0xa5, 0xad, 0xb8, 0xc4, 0xd2, 0xe0, 0xf0, 0x00,}; static const struct reg_default drv2665_reg_defs[] = {	{ DRV2665_STATUS, 0x02 },	{ DRV2665_CTRL_1, 0x28 },	{ DRV2665_CTRL_2, 0x40 },	{ DRV2665_FIFO, 0x00 },}; static void drv2665_worker(struct work_struct *work){	struct drv2665_data *haptics =				container_of(work, struct drv2665_data, work);	unsigned int read_buf;	int error; 	error = regmap_read(haptics->regmap, DRV2665_STATUS, &read_buf);	if (error) {		dev_err(&haptics->client->dev,			"Failed to read status: %d\n", error);		return;	} 	if (read_buf & DRV2665_FIFO_EMPTY) {		error = regmap_bulk_write(haptics->regmap,					  DRV2665_FIFO,					  drv2665_sine_wave_form,					  ARRAY_SIZE(drv2665_sine_wave_form));		if (error) {			dev_err(&haptics->client->dev,				"Failed to write FIFO: %d\n", error);			return;		}	}} static int drv2665_haptics_play(struct input_dev *input, void *data,				struct ff_effect *effect){	struct drv2665_data *haptics = input_get_drvdata(input); 	schedule_work(&haptics->work); 	return 0;} static void drv2665_close(struct input_dev *input){	struct drv2665_data *haptics = input_get_drvdata(input);	int error; 	cancel_work_sync(&haptics->work); 	error = regmap_update_bits(haptics->regmap, DRV2665_CTRL_2,				   DRV2665_STANDBY, DRV2665_STANDBY);	if (error)		dev_err(&haptics->client->dev,			"Failed to enter standby mode: %d\n", error);} static const struct reg_sequence drv2665_init_regs[] = {	{ DRV2665_CTRL_2, 0 | DRV2665_10_MS_IDLE_TOUT },	{ DRV2665_CTRL_1, DRV2665_25_VPP_GAIN },}; static int drv2665_init(struct drv2665_data *haptics){	int error; 	error = regmap_register_patch(haptics->regmap,				      drv2665_init_regs,				      ARRAY_SIZE(drv2665_init_regs));	if (error) {		dev_err(&haptics->client->dev,			"Failed to write init registers: %d\n",			error);		return error;	} 	return 0;} static const struct regmap_config drv2665_regmap_config = {	.reg_bits = 8,	.val_bits = 8, 	.max_register = DRV2665_FIFO,	.reg_defaults = drv2665_reg_defs,	.num_reg_defaults = ARRAY_SIZE(drv2665_reg_defs),	.cache_type = REGCACHE_NONE,}; static int drv2665_probe(struct i2c_client *client){	struct drv2665_data *haptics;	int error; 	haptics = devm_kzalloc(&client->dev, sizeof(*haptics), GFP_KERNEL);	if (!haptics)		return -ENOMEM; 	haptics->regulator = devm_regulator_get(&client->dev, "vbat");	if (IS_ERR(haptics->regulator)) {		error = PTR_ERR(haptics->regulator);		dev_err(&client->dev,			"unable to get regulator, error: %d\n", error);		return error;	} 	haptics->input_dev = devm_input_allocate_device(&client->dev);	if (!haptics->input_dev) {		dev_err(&client->dev, "Failed to allocate input device\n");		return -ENOMEM;	} 	haptics->input_dev->name = "drv2665:haptics";	haptics->input_dev->dev.parent = client->dev.parent;	haptics->input_dev->close = drv2665_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,					drv2665_haptics_play);	if (error) {		dev_err(&client->dev, "input_ff_create() failed: %d\n",			error);		return error;	} 	INIT_WORK(&haptics->work, drv2665_worker); 	haptics->client = client;	i2c_set_clientdata(client, haptics); 	haptics->regmap = devm_regmap_init_i2c(client, &drv2665_regmap_config);	if (IS_ERR(haptics->regmap)) {		error = PTR_ERR(haptics->regmap);		dev_err(&client->dev, "Failed to allocate register map: %d\n",			error);		return error;	} 	error = drv2665_init(haptics);	if (error) {		dev_err(&client->dev, "Device init failed: %d\n", error);		return error;	} 	error = input_register_device(haptics->input_dev);	if (error) {		dev_err(&client->dev, "couldn't register input device: %d\n",			error);		return error;	} 	return 0;} static int drv2665_suspend(struct device *dev){	struct drv2665_data *haptics = dev_get_drvdata(dev);	int error; 	guard(mutex)(&haptics->input_dev->mutex); 	if (input_device_enabled(haptics->input_dev)) {		error = regmap_update_bits(haptics->regmap, DRV2665_CTRL_2,					   DRV2665_STANDBY, DRV2665_STANDBY);		if (error) {			dev_err(dev, "Failed to set standby mode\n");			regulator_disable(haptics->regulator);			return error;		} 		error = regulator_disable(haptics->regulator);		if (error) {			dev_err(dev, "Failed to disable regulator\n");			regmap_update_bits(haptics->regmap,					   DRV2665_CTRL_2,					   DRV2665_STANDBY, 0);			return error;		}	} 	return 0;} static int drv2665_resume(struct device *dev){	struct drv2665_data *haptics = dev_get_drvdata(dev);	int error; 	guard(mutex)(&haptics->input_dev->mutex); 	if (input_device_enabled(haptics->input_dev)) {		error = regulator_enable(haptics->regulator);		if (error) {			dev_err(dev, "Failed to enable regulator\n");			return error;		} 		error = regmap_update_bits(haptics->regmap, DRV2665_CTRL_2,					   DRV2665_STANDBY, 0);		if (error) {			dev_err(dev, "Failed to unset standby mode\n");			regulator_disable(haptics->regulator);			return error;		} 	} 	return 0;} static DEFINE_SIMPLE_DEV_PM_OPS(drv2665_pm_ops, drv2665_suspend, drv2665_resume); static const struct i2c_device_id drv2665_id[] = {	{ .name = "drv2665" },	{ }};MODULE_DEVICE_TABLE(i2c, drv2665_id); #ifdef CONFIG_OFstatic const struct of_device_id drv2665_of_match[] = {	{ .compatible = "ti,drv2665", },	{ }};MODULE_DEVICE_TABLE(of, drv2665_of_match);#endif static struct i2c_driver drv2665_driver = {	.probe		= drv2665_probe,	.driver		= {		.name	= "drv2665-haptics",		.of_match_table = of_match_ptr(drv2665_of_match),		.pm	= pm_sleep_ptr(&drv2665_pm_ops),	},	.id_table = drv2665_id,};module_i2c_driver(drv2665_driver); MODULE_DESCRIPTION("TI DRV2665 haptics driver");MODULE_LICENSE("GPL");MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");