drivers/input/misc/drv2665.c - kernel/msm-4.9 - Gitiles

 /*
  * DRV2665 haptics driver family
  *
  * Author: Dan Murphy <dmurphy@ti.com>
  *
  * Copyright: (C) 2015 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/regulator/consumer.h>

 /* Contol 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 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, 1);
 	if (error)
 		dev_err(&haptics->client->dev,
 			"Failed to enter standby mode: %d\n", error);
 }

 static const struct reg_default 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,
 			 const struct i2c_device_id *id)
 {
 	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 __maybe_unused drv2665_suspend(struct device *dev)
 {
 	struct drv2665_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, DRV2665_CTRL_2,
 				DRV2665_STANDBY, 1);
 		if (ret) {
 			dev_err(dev, "Failed to set standby mode\n");
 			regulator_disable(haptics->regulator);
 			goto out;
 		}

 		ret = regulator_disable(haptics->regulator);
 		if (ret) {
 			dev_err(dev, "Failed to disable regulator\n");
 			regmap_update_bits(haptics->regmap,
 					   DRV2665_CTRL_2,
 					   DRV2665_STANDBY, 0);
 		}
 	}
 out:
 	mutex_unlock(&haptics->input_dev->mutex);
 	return ret;
 }

 static int __maybe_unused drv2665_resume(struct device *dev)
 {
 	struct drv2665_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, DRV2665_CTRL_2,
 					 DRV2665_STANDBY, 0);
 		if (ret) {
 			dev_err(dev, "Failed to unset standby mode\n");
 			regulator_disable(haptics->regulator);
 			goto out;
 		}

 	}

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

 static SIMPLE_DEV_PM_OPS(drv2665_pm_ops, drv2665_suspend, drv2665_resume);

 static const struct i2c_device_id drv2665_id[] = {
 	{ "drv2665", 0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, drv2665_id);

 #ifdef CONFIG_OF
 static 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",
 		.owner	= THIS_MODULE,
 		.of_match_table = of_match_ptr(drv2665_of_match),
 		.pm	= &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>");
	/*
	* DRV2665 haptics driver family
	*
	* Author: Dan Murphy <dmurphy@ti.com>
	*
	* Copyright: (C) 2015 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/regulator/consumer.h>

	/* Contol 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 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, 1);
	if (error)
	dev_err(&haptics->client->dev,
	"Failed to enter standby mode: %d\n", error);
	}

	static const struct reg_default 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,
	const struct i2c_device_id *id)
	{
	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 __maybe_unused drv2665_suspend(struct device *dev)
	{
	struct drv2665_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, DRV2665_CTRL_2,
	DRV2665_STANDBY, 1);
	if (ret) {
	dev_err(dev, "Failed to set standby mode\n");
	regulator_disable(haptics->regulator);
	goto out;
	}

	ret = regulator_disable(haptics->regulator);
	if (ret) {
	dev_err(dev, "Failed to disable regulator\n");
	regmap_update_bits(haptics->regmap,
	DRV2665_CTRL_2,
	DRV2665_STANDBY, 0);
	}
	}
	out:
	mutex_unlock(&haptics->input_dev->mutex);
	return ret;
	}

	static int __maybe_unused drv2665_resume(struct device *dev)
	{
	struct drv2665_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, DRV2665_CTRL_2,
	DRV2665_STANDBY, 0);
	if (ret) {
	dev_err(dev, "Failed to unset standby mode\n");
	regulator_disable(haptics->regulator);
	goto out;
	}

	}

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

	static SIMPLE_DEV_PM_OPS(drv2665_pm_ops, drv2665_suspend, drv2665_resume);

	static const struct i2c_device_id drv2665_id[] = {
	{ "drv2665", 0 },
	{ }
	};
	MODULE_DEVICE_TABLE(i2c, drv2665_id);

	#ifdef CONFIG_OF
	static 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",
	.owner = THIS_MODULE,
	.of_match_table = of_match_ptr(drv2665_of_match),
	.pm = &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>");