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ubuntu-linux-kernel/drivers/input/misc/drv2665.c

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/*
* 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 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,
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, DRV2665_STANDBY);
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",
.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>");
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