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Release 4.11 drivers/input/misc/drv2667.c

/*
 * DRV2667 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/platform_device.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/regulator/consumer.h>

/* Contol registers */

#define DRV2667_STATUS	0x00

#define DRV2667_CTRL_1	0x01

#define DRV2667_CTRL_2	0x02
/* Waveform sequencer */

#define DRV2667_WV_SEQ_0	0x03

#define DRV2667_WV_SEQ_1	0x04

#define DRV2667_WV_SEQ_2	0x05

#define DRV2667_WV_SEQ_3	0x06

#define DRV2667_WV_SEQ_4	0x07

#define DRV2667_WV_SEQ_5	0x08

#define DRV2667_WV_SEQ_6	0x09

#define DRV2667_WV_SEQ_7	0x0A

#define DRV2667_FIFO		0x0B

#define DRV2667_PAGE		0xFF

#define DRV2667_MAX_REG		DRV2667_PAGE


#define DRV2667_PAGE_0		0x00

#define DRV2667_PAGE_1		0x01

#define DRV2667_PAGE_2		0x02

#define DRV2667_PAGE_3		0x03

#define DRV2667_PAGE_4		0x04

#define DRV2667_PAGE_5		0x05

#define DRV2667_PAGE_6		0x06

#define DRV2667_PAGE_7		0x07

#define DRV2667_PAGE_8		0x08

/* RAM fields */

#define DRV2667_RAM_HDR_SZ	0x0
/* RAM Header addresses */

#define DRV2667_RAM_START_HI	0x01

#define DRV2667_RAM_START_LO	0x02

#define DRV2667_RAM_STOP_HI		0x03

#define DRV2667_RAM_STOP_LO		0x04

#define DRV2667_RAM_REPEAT_CT	0x05
/* RAM data addresses */

#define DRV2667_RAM_AMP		0x06

#define DRV2667_RAM_FREQ	0x07

#define DRV2667_RAM_DURATION	0x08

#define DRV2667_RAM_ENVELOPE	0x09

/* Control 1 Register */

#define DRV2667_25_VPP_GAIN		0x00

#define DRV2667_50_VPP_GAIN		0x01

#define DRV2667_75_VPP_GAIN		0x02

#define DRV2667_100_VPP_GAIN	0x03

#define DRV2667_DIGITAL_IN		0xfc

#define DRV2667_ANALOG_IN		(1 << 2)

/* Control 2 Register */

#define DRV2667_GO			(1 << 0)

#define DRV2667_STANDBY		(1 << 6)

#define DRV2667_DEV_RST		(1 << 7)

/* RAM Envelope settings */

#define DRV2667_NO_ENV			0x00

#define DRV2667_32_MS_ENV		0x01

#define DRV2667_64_MS_ENV		0x02

#define DRV2667_96_MS_ENV		0x03

#define DRV2667_128_MS_ENV		0x04

#define DRV2667_160_MS_ENV		0x05

#define DRV2667_192_MS_ENV		0x06

#define DRV2667_224_MS_ENV		0x07

#define DRV2667_256_MS_ENV		0x08

#define DRV2667_512_MS_ENV		0x09

#define DRV2667_768_MS_ENV		0x0a

#define DRV2667_1024_MS_ENV		0x0b

#define DRV2667_1280_MS_ENV		0x0c

#define DRV2667_1536_MS_ENV		0x0d

#define DRV2667_1792_MS_ENV		0x0e

#define DRV2667_2048_MS_ENV		0x0f

/**
 * struct drv2667_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
 * @magnitude - Magnitude of the vibration event
**/

struct drv2667_data {
	
struct input_dev *input_dev;
	
struct i2c_client *client;
	
struct regmap *regmap;
	
struct work_struct work;
	
struct regulator *regulator;
	
u32 page;
	
u32 magnitude;
	
u32 frequency;
};


static const struct reg_default drv2667_reg_defs[] = {
	{ DRV2667_STATUS, 0x02 },
	{ DRV2667_CTRL_1, 0x28 },
	{ DRV2667_CTRL_2, 0x40 },
	{ DRV2667_WV_SEQ_0, 0x00 },
	{ DRV2667_WV_SEQ_1, 0x00 },
	{ DRV2667_WV_SEQ_2, 0x00 },
	{ DRV2667_WV_SEQ_3, 0x00 },
	{ DRV2667_WV_SEQ_4, 0x00 },
	{ DRV2667_WV_SEQ_5, 0x00 },
	{ DRV2667_WV_SEQ_6, 0x00 },
	{ DRV2667_WV_SEQ_7, 0x00 },
	{ DRV2667_FIFO, 0x00 },
	{ DRV2667_PAGE, 0x00 },
};


static int drv2667_set_waveform_freq(struct drv2667_data *haptics) { unsigned int read_buf; int freq; int error; /* Per the data sheet: * Sinusoid Frequency (Hz) = 7.8125 x Frequency */ freq = (haptics->frequency * 1000) / 78125; if (freq <= 0) { dev_err(&haptics->client->dev, "ERROR: Frequency calculated to %i\n", freq); return -EINVAL; } error = regmap_read(haptics->regmap, DRV2667_PAGE, &read_buf); if (error) { dev_err(&haptics->client->dev, "Failed to read the page number: %d\n", error); return -EIO; } if (read_buf == DRV2667_PAGE_0 || haptics->page != read_buf) { error = regmap_write(haptics->regmap, DRV2667_PAGE, haptics->page); if (error) { dev_err(&haptics->client->dev, "Failed to set the page: %d\n", error); return -EIO; } } error = regmap_write(haptics->regmap, DRV2667_RAM_FREQ, freq); if (error) dev_err(&haptics->client->dev, "Failed to set the frequency: %d\n", error); /* Reset back to original page */ if (read_buf == DRV2667_PAGE_0 || haptics->page != read_buf) { error = regmap_write(haptics->regmap, DRV2667_PAGE, read_buf); if (error) { dev_err(&haptics->client->dev, "Failed to set the page: %d\n", error); return -EIO; } } return error; }

Contributors

PersonTokensPropCommitsCommitProp
Dan Murphy237100.00%1100.00%
Total237100.00%1100.00%


static void drv2667_worker(struct work_struct *work) { struct drv2667_data *haptics = container_of(work, struct drv2667_data, work); int error; if (haptics->magnitude) { error = regmap_write(haptics->regmap, DRV2667_PAGE, haptics->page); if (error) { dev_err(&haptics->client->dev, "Failed to set the page: %d\n", error); return; } error = regmap_write(haptics->regmap, DRV2667_RAM_AMP, haptics->magnitude); if (error) { dev_err(&haptics->client->dev, "Failed to set the amplitude: %d\n", error); return; } error = regmap_write(haptics->regmap, DRV2667_PAGE, DRV2667_PAGE_0); if (error) { dev_err(&haptics->client->dev, "Failed to set the page: %d\n", error); return; } error = regmap_write(haptics->regmap, DRV2667_CTRL_2, DRV2667_GO); if (error) { dev_err(&haptics->client->dev, "Failed to set the GO bit: %d\n", error); } } else { error = regmap_update_bits(haptics->regmap, DRV2667_CTRL_2, DRV2667_GO, 0); if (error) { dev_err(&haptics->client->dev, "Failed to unset the GO bit: %d\n", error); } } }

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Dan Murphy214100.00%1100.00%
Total214100.00%1100.00%


static int drv2667_haptics_play(struct input_dev *input, void *data, struct ff_effect *effect) { struct drv2667_data *haptics = input_get_drvdata(input); 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; }

Contributors

PersonTokensPropCommitsCommitProp
Dan Murphy97100.00%1100.00%
Total97100.00%1100.00%


static void drv2667_close(struct input_dev *input) { struct drv2667_data *haptics = input_get_drvdata(input); int error; cancel_work_sync(&haptics->work); error = regmap_update_bits(haptics->regmap, DRV2667_CTRL_2, DRV2667_STANDBY, DRV2667_STANDBY); if (error) dev_err(&haptics->client->dev, "Failed to enter standby mode: %d\n", error); }

Contributors

PersonTokensPropCommitsCommitProp
Dan Murphy6498.46%150.00%
Florian Vaussard11.54%150.00%
Total65100.00%2100.00%

static const struct reg_sequence drv2667_init_regs[] = { { DRV2667_CTRL_2, 0 }, { DRV2667_CTRL_1, DRV2667_25_VPP_GAIN }, { DRV2667_WV_SEQ_0, 1 }, { DRV2667_WV_SEQ_1, 0 } }; static const struct reg_sequence drv2667_page1_init[] = { { DRV2667_RAM_HDR_SZ, 0x05 }, { DRV2667_RAM_START_HI, 0x80 }, { DRV2667_RAM_START_LO, 0x06 }, { DRV2667_RAM_STOP_HI, 0x00 }, { DRV2667_RAM_STOP_LO, 0x09 }, { DRV2667_RAM_REPEAT_CT, 0 }, { DRV2667_RAM_DURATION, 0x05 }, { DRV2667_RAM_ENVELOPE, DRV2667_NO_ENV }, { DRV2667_RAM_AMP, 0x60 }, };
static int drv2667_init(struct drv2667_data *haptics) { int error; /* Set default haptic frequency to 195Hz on Page 1*/ haptics->frequency = 195; haptics->page = DRV2667_PAGE_1; error = regmap_register_patch(haptics->regmap, drv2667_init_regs, ARRAY_SIZE(drv2667_init_regs)); if (error) { dev_err(&haptics->client->dev, "Failed to write init registers: %d\n", error); return error; } error = regmap_write(haptics->regmap, DRV2667_PAGE, haptics->page); if (error) { dev_err(&haptics->client->dev, "Failed to set page: %d\n", error); goto error_out; } error = drv2667_set_waveform_freq(haptics); if (error) goto error_page; error = regmap_register_patch(haptics->regmap, drv2667_page1_init, ARRAY_SIZE(drv2667_page1_init)); if (error) { dev_err(&haptics->client->dev, "Failed to write page registers: %d\n", error); return error; } error = regmap_write(haptics->regmap, DRV2667_PAGE, DRV2667_PAGE_0); return error; error_page: regmap_write(haptics->regmap, DRV2667_PAGE, DRV2667_PAGE_0); error_out: return error; }

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Dan Murphy191100.00%1100.00%
Total191100.00%1100.00%

static const struct regmap_config drv2667_regmap_config = { .reg_bits = 8, .val_bits = 8, .max_register = DRV2667_MAX_REG, .reg_defaults = drv2667_reg_defs, .num_reg_defaults = ARRAY_SIZE(drv2667_reg_defs), .cache_type = REGCACHE_NONE, };
static int drv2667_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct drv2667_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 = "drv2667:haptics"; haptics->input_dev->dev.parent = client->dev.parent; haptics->input_dev->close = drv2667_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, drv2667_haptics_play); if (error) { dev_err(&client->dev, "input_ff_create() failed: %d\n", error); return error; } INIT_WORK(&haptics->work, drv2667_worker); haptics->client = client; i2c_set_clientdata(client, haptics); haptics->regmap = devm_regmap_init_i2c(client, &drv2667_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 = drv2667_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; }

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Dan Murphy351100.00%1100.00%
Total351100.00%1100.00%


static int __maybe_unused drv2667_suspend(struct device *dev) { struct drv2667_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, DRV2667_CTRL_2, DRV2667_STANDBY, DRV2667_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, DRV2667_CTRL_2, DRV2667_STANDBY, 0); } } out: mutex_unlock(&haptics->input_dev->mutex); return ret; }

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PersonTokensPropCommitsCommitProp
Dan Murphy13398.52%133.33%
Florian Vaussard10.74%133.33%
Jingoo Han10.74%133.33%
Total135100.00%3100.00%


static int __maybe_unused drv2667_resume(struct device *dev) { struct drv2667_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, DRV2667_CTRL_2, DRV2667_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; }

Contributors

PersonTokensPropCommitsCommitProp
Dan Murphy12499.20%150.00%
Jingoo Han10.80%150.00%
Total125100.00%2100.00%

static SIMPLE_DEV_PM_OPS(drv2667_pm_ops, drv2667_suspend, drv2667_resume); static const struct i2c_device_id drv2667_id[] = { { "drv2667", 0 }, { } }; MODULE_DEVICE_TABLE(i2c, drv2667_id); #ifdef CONFIG_OF static const struct of_device_id drv2667_of_match[] = { { .compatible = "ti,drv2667", }, { } }; MODULE_DEVICE_TABLE(of, drv2667_of_match); #endif static struct i2c_driver drv2667_driver = { .probe = drv2667_probe, .driver = { .name = "drv2667-haptics", .of_match_table = of_match_ptr(drv2667_of_match), .pm = &drv2667_pm_ops, }, .id_table = drv2667_id, }; module_i2c_driver(drv2667_driver); MODULE_DESCRIPTION("TI DRV2667 haptics driver"); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");

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Dan Murphy206199.66%120.00%
Jingoo Han20.10%120.00%
Florian Vaussard20.10%120.00%
Nariman Poushin20.10%120.00%
Axel Lin10.05%120.00%
Total2068100.00%5100.00%
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