322 lines
8 KiB
C
322 lines
8 KiB
C
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/*
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* DRV2665 haptics driver family
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*
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* Author: Dan Murphy <dmurphy@ti.com>
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*
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* Copyright: (C) 2015 Texas Instruments, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*/
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#include <linux/i2c.h>
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#include <linux/input.h>
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#include <linux/module.h>
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#include <linux/regmap.h>
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#include <linux/slab.h>
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#include <linux/delay.h>
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#include <linux/regulator/consumer.h>
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/* Contol registers */
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#define DRV2665_STATUS 0x00
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#define DRV2665_CTRL_1 0x01
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#define DRV2665_CTRL_2 0x02
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#define DRV2665_FIFO 0x0b
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/* Status Register */
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#define DRV2665_FIFO_FULL BIT(0)
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#define DRV2665_FIFO_EMPTY BIT(1)
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/* Control 1 Register */
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#define DRV2665_25_VPP_GAIN 0x00
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#define DRV2665_50_VPP_GAIN 0x01
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#define DRV2665_75_VPP_GAIN 0x02
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#define DRV2665_100_VPP_GAIN 0x03
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#define DRV2665_DIGITAL_IN 0xfc
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#define DRV2665_ANALOG_IN BIT(2)
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/* Control 2 Register */
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#define DRV2665_BOOST_EN BIT(1)
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#define DRV2665_STANDBY BIT(6)
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#define DRV2665_DEV_RST BIT(7)
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#define DRV2665_5_MS_IDLE_TOUT 0x00
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#define DRV2665_10_MS_IDLE_TOUT 0x04
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#define DRV2665_15_MS_IDLE_TOUT 0x08
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#define DRV2665_20_MS_IDLE_TOUT 0x0c
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/**
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* struct drv2665_data -
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* @input_dev - Pointer to the input device
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* @client - Pointer to the I2C client
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* @regmap - Register map of the device
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* @work - Work item used to off load the enable/disable of the vibration
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* @regulator - Pointer to the regulator for the IC
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*/
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struct drv2665_data {
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struct input_dev *input_dev;
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struct i2c_client *client;
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struct regmap *regmap;
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struct work_struct work;
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struct regulator *regulator;
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};
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/* 8kHz Sine wave to stream to the FIFO */
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static const u8 drv2665_sine_wave_form[] = {
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0x00, 0x10, 0x20, 0x2e, 0x3c, 0x48, 0x53, 0x5b, 0x61, 0x65, 0x66,
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0x65, 0x61, 0x5b, 0x53, 0x48, 0x3c, 0x2e, 0x20, 0x10,
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0x00, 0xf0, 0xe0, 0xd2, 0xc4, 0xb8, 0xad, 0xa5, 0x9f, 0x9b, 0x9a,
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0x9b, 0x9f, 0xa5, 0xad, 0xb8, 0xc4, 0xd2, 0xe0, 0xf0, 0x00,
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};
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static const struct reg_default drv2665_reg_defs[] = {
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{ DRV2665_STATUS, 0x02 },
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{ DRV2665_CTRL_1, 0x28 },
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{ DRV2665_CTRL_2, 0x40 },
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{ DRV2665_FIFO, 0x00 },
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};
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static void drv2665_worker(struct work_struct *work)
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{
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struct drv2665_data *haptics =
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container_of(work, struct drv2665_data, work);
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unsigned int read_buf;
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int error;
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error = regmap_read(haptics->regmap, DRV2665_STATUS, &read_buf);
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if (error) {
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dev_err(&haptics->client->dev,
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"Failed to read status: %d\n", error);
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return;
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}
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if (read_buf & DRV2665_FIFO_EMPTY) {
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error = regmap_bulk_write(haptics->regmap,
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DRV2665_FIFO,
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drv2665_sine_wave_form,
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ARRAY_SIZE(drv2665_sine_wave_form));
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if (error) {
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dev_err(&haptics->client->dev,
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"Failed to write FIFO: %d\n", error);
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return;
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}
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}
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}
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static int drv2665_haptics_play(struct input_dev *input, void *data,
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struct ff_effect *effect)
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{
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struct drv2665_data *haptics = input_get_drvdata(input);
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schedule_work(&haptics->work);
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return 0;
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}
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static void drv2665_close(struct input_dev *input)
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{
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struct drv2665_data *haptics = input_get_drvdata(input);
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int error;
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cancel_work_sync(&haptics->work);
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error = regmap_update_bits(haptics->regmap, DRV2665_CTRL_2,
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DRV2665_STANDBY, DRV2665_STANDBY);
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if (error)
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dev_err(&haptics->client->dev,
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"Failed to enter standby mode: %d\n", error);
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}
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static const struct reg_sequence drv2665_init_regs[] = {
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{ DRV2665_CTRL_2, 0 | DRV2665_10_MS_IDLE_TOUT },
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{ DRV2665_CTRL_1, DRV2665_25_VPP_GAIN },
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};
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static int drv2665_init(struct drv2665_data *haptics)
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{
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int error;
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error = regmap_register_patch(haptics->regmap,
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drv2665_init_regs,
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ARRAY_SIZE(drv2665_init_regs));
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if (error) {
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dev_err(&haptics->client->dev,
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"Failed to write init registers: %d\n",
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error);
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return error;
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}
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return 0;
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}
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static const struct regmap_config drv2665_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = DRV2665_FIFO,
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.reg_defaults = drv2665_reg_defs,
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.num_reg_defaults = ARRAY_SIZE(drv2665_reg_defs),
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.cache_type = REGCACHE_NONE,
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};
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static int drv2665_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct drv2665_data *haptics;
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int error;
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haptics = devm_kzalloc(&client->dev, sizeof(*haptics), GFP_KERNEL);
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if (!haptics)
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return -ENOMEM;
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haptics->regulator = devm_regulator_get(&client->dev, "vbat");
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if (IS_ERR(haptics->regulator)) {
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error = PTR_ERR(haptics->regulator);
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dev_err(&client->dev,
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"unable to get regulator, error: %d\n", error);
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return error;
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}
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haptics->input_dev = devm_input_allocate_device(&client->dev);
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if (!haptics->input_dev) {
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dev_err(&client->dev, "Failed to allocate input device\n");
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return -ENOMEM;
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}
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haptics->input_dev->name = "drv2665:haptics";
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haptics->input_dev->dev.parent = client->dev.parent;
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haptics->input_dev->close = drv2665_close;
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input_set_drvdata(haptics->input_dev, haptics);
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input_set_capability(haptics->input_dev, EV_FF, FF_RUMBLE);
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error = input_ff_create_memless(haptics->input_dev, NULL,
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drv2665_haptics_play);
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if (error) {
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dev_err(&client->dev, "input_ff_create() failed: %d\n",
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error);
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return error;
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}
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INIT_WORK(&haptics->work, drv2665_worker);
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haptics->client = client;
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i2c_set_clientdata(client, haptics);
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haptics->regmap = devm_regmap_init_i2c(client, &drv2665_regmap_config);
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if (IS_ERR(haptics->regmap)) {
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error = PTR_ERR(haptics->regmap);
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dev_err(&client->dev, "Failed to allocate register map: %d\n",
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error);
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return error;
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}
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error = drv2665_init(haptics);
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if (error) {
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dev_err(&client->dev, "Device init failed: %d\n", error);
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return error;
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}
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error = input_register_device(haptics->input_dev);
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if (error) {
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dev_err(&client->dev, "couldn't register input device: %d\n",
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error);
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return error;
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}
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return 0;
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}
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static int __maybe_unused drv2665_suspend(struct device *dev)
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{
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struct drv2665_data *haptics = dev_get_drvdata(dev);
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int ret = 0;
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mutex_lock(&haptics->input_dev->mutex);
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if (haptics->input_dev->users) {
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ret = regmap_update_bits(haptics->regmap, DRV2665_CTRL_2,
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DRV2665_STANDBY, DRV2665_STANDBY);
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if (ret) {
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dev_err(dev, "Failed to set standby mode\n");
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regulator_disable(haptics->regulator);
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goto out;
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}
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ret = regulator_disable(haptics->regulator);
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if (ret) {
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dev_err(dev, "Failed to disable regulator\n");
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regmap_update_bits(haptics->regmap,
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DRV2665_CTRL_2,
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DRV2665_STANDBY, 0);
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}
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}
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out:
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mutex_unlock(&haptics->input_dev->mutex);
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return ret;
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}
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static int __maybe_unused drv2665_resume(struct device *dev)
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{
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struct drv2665_data *haptics = dev_get_drvdata(dev);
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int ret = 0;
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mutex_lock(&haptics->input_dev->mutex);
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if (haptics->input_dev->users) {
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ret = regulator_enable(haptics->regulator);
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if (ret) {
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dev_err(dev, "Failed to enable regulator\n");
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goto out;
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}
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ret = regmap_update_bits(haptics->regmap, DRV2665_CTRL_2,
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DRV2665_STANDBY, 0);
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if (ret) {
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dev_err(dev, "Failed to unset standby mode\n");
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regulator_disable(haptics->regulator);
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goto out;
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}
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}
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out:
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mutex_unlock(&haptics->input_dev->mutex);
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return ret;
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}
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static SIMPLE_DEV_PM_OPS(drv2665_pm_ops, drv2665_suspend, drv2665_resume);
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static const struct i2c_device_id drv2665_id[] = {
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{ "drv2665", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, drv2665_id);
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#ifdef CONFIG_OF
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static const struct of_device_id drv2665_of_match[] = {
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{ .compatible = "ti,drv2665", },
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{ }
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};
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MODULE_DEVICE_TABLE(of, drv2665_of_match);
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#endif
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static struct i2c_driver drv2665_driver = {
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.probe = drv2665_probe,
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.driver = {
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.name = "drv2665-haptics",
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.of_match_table = of_match_ptr(drv2665_of_match),
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.pm = &drv2665_pm_ops,
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},
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.id_table = drv2665_id,
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};
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module_i2c_driver(drv2665_driver);
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MODULE_DESCRIPTION("TI DRV2665 haptics driver");
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");
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