[linux-2.6-block.git] / drivers / input / misc / drv2667.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * DRV2667 haptics driver family
 *
 * Author: Dan Murphy <dmurphy@ti.com>
 *
 * Copyright: (C) 2014 Texas Instruments, Inc.
 */

#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;
}

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);
		}
	}
}

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;
}

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);
}

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;
}

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;
}

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;
}

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;
}

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>");
Commit	Line	Data
1802d0be	1	// SPDX-License-Identifier: GPL-2.0-only
1c246225 DM	2	/*
	3	* DRV2667 haptics driver family
	4	*
	5	* Author: Dan Murphy <dmurphy@ti.com>
	6	*
	7	* Copyright: (C) 2014 Texas Instruments, Inc.
1c246225 DM	8	*/
	9
	10	#include <linux/i2c.h>
	11	#include <linux/input.h>
	12	#include <linux/module.h>
	13	#include <linux/platform_device.h>
	14	#include <linux/regmap.h>
	15	#include <linux/slab.h>
	16	#include <linux/delay.h>
	17	#include <linux/regulator/consumer.h>
	18
	19	/* Contol registers */
	20	#define DRV2667_STATUS 0x00
	21	#define DRV2667_CTRL_1 0x01
	22	#define DRV2667_CTRL_2 0x02
	23	/* Waveform sequencer */
	24	#define DRV2667_WV_SEQ_0 0x03
	25	#define DRV2667_WV_SEQ_1 0x04
	26	#define DRV2667_WV_SEQ_2 0x05
	27	#define DRV2667_WV_SEQ_3 0x06
	28	#define DRV2667_WV_SEQ_4 0x07
	29	#define DRV2667_WV_SEQ_5 0x08
	30	#define DRV2667_WV_SEQ_6 0x09
	31	#define DRV2667_WV_SEQ_7 0x0A
	32	#define DRV2667_FIFO 0x0B
	33	#define DRV2667_PAGE 0xFF
	34	#define DRV2667_MAX_REG DRV2667_PAGE
	35
	36	#define DRV2667_PAGE_0 0x00
	37	#define DRV2667_PAGE_1 0x01
	38	#define DRV2667_PAGE_2 0x02
	39	#define DRV2667_PAGE_3 0x03
	40	#define DRV2667_PAGE_4 0x04
	41	#define DRV2667_PAGE_5 0x05
	42	#define DRV2667_PAGE_6 0x06
	43	#define DRV2667_PAGE_7 0x07
	44	#define DRV2667_PAGE_8 0x08
	45
	46	/* RAM fields */
	47	#define DRV2667_RAM_HDR_SZ 0x0
	48	/* RAM Header addresses */
	49	#define DRV2667_RAM_START_HI 0x01
	50	#define DRV2667_RAM_START_LO 0x02
	51	#define DRV2667_RAM_STOP_HI 0x03
	52	#define DRV2667_RAM_STOP_LO 0x04
	53	#define DRV2667_RAM_REPEAT_CT 0x05
	54	/* RAM data addresses */
	55	#define DRV2667_RAM_AMP 0x06
	56	#define DRV2667_RAM_FREQ 0x07
	57	#define DRV2667_RAM_DURATION 0x08
	58	#define DRV2667_RAM_ENVELOPE 0x09
	59
	60	/* Control 1 Register */
	61	#define DRV2667_25_VPP_GAIN 0x00
	62	#define DRV2667_50_VPP_GAIN 0x01
	63	#define DRV2667_75_VPP_GAIN 0x02
	64	#define DRV2667_100_VPP_GAIN 0x03
	65	#define DRV2667_DIGITAL_IN 0xfc
	66	#define DRV2667_ANALOG_IN (1 << 2)
	67
	68	/* Control 2 Register */
	69	#define DRV2667_GO (1 << 0)
	70	#define DRV2667_STANDBY (1 << 6)
	71	#define DRV2667_DEV_RST (1 << 7)
72
73	/* RAM Envelope settings */
74	#define DRV2667_NO_ENV 0x00
75	#define DRV2667_32_MS_ENV 0x01
76	#define DRV2667_64_MS_ENV 0x02
77	#define DRV2667_96_MS_ENV 0x03
78	#define DRV2667_128_MS_ENV 0x04
79	#define DRV2667_160_MS_ENV 0x05
80	#define DRV2667_192_MS_ENV 0x06
81	#define DRV2667_224_MS_ENV 0x07
82	#define DRV2667_256_MS_ENV 0x08
83	#define DRV2667_512_MS_ENV 0x09
84	#define DRV2667_768_MS_ENV 0x0a
85	#define DRV2667_1024_MS_ENV 0x0b
86	#define DRV2667_1280_MS_ENV 0x0c
87	#define DRV2667_1536_MS_ENV 0x0d
88	#define DRV2667_1792_MS_ENV 0x0e
89	#define DRV2667_2048_MS_ENV 0x0f
90
91	/**
92	* struct drv2667_data -
93	* @input_dev - Pointer to the input device
94	* @client - Pointer to the I2C client
95	* @regmap - Register map of the device
96	* @work - Work item used to off load the enable/disable of the vibration
97	* @regulator - Pointer to the regulator for the IC
98	* @magnitude - Magnitude of the vibration event
99	**/
100	struct drv2667_data {
101	struct input_dev *input_dev;
102	struct i2c_client *client;
103	struct regmap *regmap;
104	struct work_struct work;
105	struct regulator *regulator;
106	u32 page;
107	u32 magnitude;
108	u32 frequency;
109	};
110
ec0843fa	111	static const struct reg_default drv2667_reg_defs[] = {
1c246225 DM	112	{ DRV2667_STATUS, 0x02 },
	113	{ DRV2667_CTRL_1, 0x28 },
	114	{ DRV2667_CTRL_2, 0x40 },
	115	{ DRV2667_WV_SEQ_0, 0x00 },
	116	{ DRV2667_WV_SEQ_1, 0x00 },
	117	{ DRV2667_WV_SEQ_2, 0x00 },
	118	{ DRV2667_WV_SEQ_3, 0x00 },
	119	{ DRV2667_WV_SEQ_4, 0x00 },
	120	{ DRV2667_WV_SEQ_5, 0x00 },
	121	{ DRV2667_WV_SEQ_6, 0x00 },
	122	{ DRV2667_WV_SEQ_7, 0x00 },
	123	{ DRV2667_FIFO, 0x00 },
	124	{ DRV2667_PAGE, 0x00 },
	125	};
	126
	127	static int drv2667_set_waveform_freq(struct drv2667_data *haptics)
	128	{
	129	unsigned int read_buf;
	130	int freq;
	131	int error;
	132
	133	/* Per the data sheet:
	134	* Sinusoid Frequency (Hz) = 7.8125 x Frequency
	135	*/
	136	freq = (haptics->frequency * 1000) / 78125;
	137	if (freq <= 0) {
	138	dev_err(&haptics->client->dev,
	139	"ERROR: Frequency calculated to %i\n", freq);
	140	return -EINVAL;
	141	}
	142
	143	error = regmap_read(haptics->regmap, DRV2667_PAGE, &read_buf);
	144	if (error) {
	145	dev_err(&haptics->client->dev,
	146	"Failed to read the page number: %d\n", error);
	147	return -EIO;
	148	}
	149
	150	if (read_buf == DRV2667_PAGE_0 \|\|
	151	haptics->page != read_buf) {
	152	error = regmap_write(haptics->regmap,
	153	DRV2667_PAGE, haptics->page);
	154	if (error) {
	155	dev_err(&haptics->client->dev,
	156	"Failed to set the page: %d\n", error);
	157	return -EIO;
	158	}
	159	}
	160
	161	error = regmap_write(haptics->regmap, DRV2667_RAM_FREQ, freq);
	162	if (error)
	163	dev_err(&haptics->client->dev,
	164	"Failed to set the frequency: %d\n", error);
	165
	166	/* Reset back to original page */
	167	if (read_buf == DRV2667_PAGE_0 \|\|
	168	haptics->page != read_buf) {
	169	error = regmap_write(haptics->regmap, DRV2667_PAGE, read_buf);
	170	if (error) {
	171	dev_err(&haptics->client->dev,
d52266fc CIK	172	"Failed to set the page: %d\n", error);
	173	return -EIO;
	174	}
1c246225 DM	175	}
	176
	177	return error;
	178	}
	179
	180	static void drv2667_worker(struct work_struct *work)
	181	{
	182	struct drv2667_data *haptics = container_of(work, struct drv2667_data, work);
	183	int error;
	184
	185	if (haptics->magnitude) {
	186	error = regmap_write(haptics->regmap,
	187	DRV2667_PAGE, haptics->page);
	188	if (error) {
	189	dev_err(&haptics->client->dev,
	190	"Failed to set the page: %d\n", error);
	191	return;
	192	}
	193
	194	error = regmap_write(haptics->regmap, DRV2667_RAM_AMP,
	195	haptics->magnitude);
	196	if (error) {
	197	dev_err(&haptics->client->dev,
	198	"Failed to set the amplitude: %d\n", error);
	199	return;
	200	}
	201
	202	error = regmap_write(haptics->regmap,
	203	DRV2667_PAGE, DRV2667_PAGE_0);
	204	if (error) {
	205	dev_err(&haptics->client->dev,
	206	"Failed to set the page: %d\n", error);
	207	return;
	208	}
	209
	210	error = regmap_write(haptics->regmap,
	211	DRV2667_CTRL_2, DRV2667_GO);
	212	if (error) {
	213	dev_err(&haptics->client->dev,
	214	"Failed to set the GO bit: %d\n", error);
	215	}
	216	} else {
	217	error = regmap_update_bits(haptics->regmap, DRV2667_CTRL_2,
	218	DRV2667_GO, 0);
	219	if (error) {
	220	dev_err(&haptics->client->dev,
	221	"Failed to unset the GO bit: %d\n", error);
	222	}
	223	}
	224	}
	225
	226	static int drv2667_haptics_play(struct input_dev input, void data,
	227	struct ff_effect *effect)
	228	{
	229	struct drv2667_data *haptics = input_get_drvdata(input);
	230
	231	if (effect->u.rumble.strong_magnitude > 0)
	232	haptics->magnitude = effect->u.rumble.strong_magnitude;
	233	else if (effect->u.rumble.weak_magnitude > 0)
	234	haptics->magnitude = effect->u.rumble.weak_magnitude;
	235	else
	236	haptics->magnitude = 0;
	237
	238	schedule_work(&haptics->work);
239
240	return 0;
241	}
242
243	static void drv2667_close(struct input_dev *input)
244	{
245	struct drv2667_data *haptics = input_get_drvdata(input);
246	int error;
247
248	cancel_work_sync(&haptics->work);
249
250	error = regmap_update_bits(haptics->regmap, DRV2667_CTRL_2,
6473bbfd	251	DRV2667_STANDBY, DRV2667_STANDBY);
1c246225 DM	252	if (error)
	253	dev_err(&haptics->client->dev,
	254	"Failed to enter standby mode: %d\n", error);
	255	}
	256
8019ff6c	257	static const struct reg_sequence drv2667_init_regs[] = {
1c246225 DM	258	{ DRV2667_CTRL_2, 0 },
	259	{ DRV2667_CTRL_1, DRV2667_25_VPP_GAIN },
	260	{ DRV2667_WV_SEQ_0, 1 },
	261	{ DRV2667_WV_SEQ_1, 0 }
	262	};
	263
8019ff6c	264	static const struct reg_sequence drv2667_page1_init[] = {
1c246225 DM	265	{ DRV2667_RAM_HDR_SZ, 0x05 },
	266	{ DRV2667_RAM_START_HI, 0x80 },
	267	{ DRV2667_RAM_START_LO, 0x06 },
	268	{ DRV2667_RAM_STOP_HI, 0x00 },
	269	{ DRV2667_RAM_STOP_LO, 0x09 },
	270	{ DRV2667_RAM_REPEAT_CT, 0 },
	271	{ DRV2667_RAM_DURATION, 0x05 },
	272	{ DRV2667_RAM_ENVELOPE, DRV2667_NO_ENV },
	273	{ DRV2667_RAM_AMP, 0x60 },
	274	};
	275
	276	static int drv2667_init(struct drv2667_data *haptics)
	277	{
	278	int error;
	279
	280	/* Set default haptic frequency to 195Hz on Page 1*/
	281	haptics->frequency = 195;
	282	haptics->page = DRV2667_PAGE_1;
	283
	284	error = regmap_register_patch(haptics->regmap,
	285	drv2667_init_regs,
	286	ARRAY_SIZE(drv2667_init_regs));
	287	if (error) {
	288	dev_err(&haptics->client->dev,
	289	"Failed to write init registers: %d\n",
	290	error);
	291	return error;
	292	}
	293
	294	error = regmap_write(haptics->regmap, DRV2667_PAGE, haptics->page);
	295	if (error) {
	296	dev_err(&haptics->client->dev, "Failed to set page: %d\n",
	297	error);
	298	goto error_out;
	299	}
	300
	301	error = drv2667_set_waveform_freq(haptics);
	302	if (error)
	303	goto error_page;
	304
	305	error = regmap_register_patch(haptics->regmap,
	306	drv2667_page1_init,
	307	ARRAY_SIZE(drv2667_page1_init));
	308	if (error) {
	309	dev_err(&haptics->client->dev,
	310	"Failed to write page registers: %d\n",
	311	error);
	312	return error;
	313	}
	314
	315	error = regmap_write(haptics->regmap, DRV2667_PAGE, DRV2667_PAGE_0);
	316	return error;
	317
	318	error_page:
	319	regmap_write(haptics->regmap, DRV2667_PAGE, DRV2667_PAGE_0);
	320	error_out:
	321	return error;
	322	}
	323
	324	static const struct regmap_config drv2667_regmap_config = {
	325	.reg_bits = 8,
	326	.val_bits = 8,
	327
	328	.max_register = DRV2667_MAX_REG,
329	.reg_defaults = drv2667_reg_defs,
330	.num_reg_defaults = ARRAY_SIZE(drv2667_reg_defs),
331	.cache_type = REGCACHE_NONE,
332	};
333
334	static int drv2667_probe(struct i2c_client *client,
335	const struct i2c_device_id *id)
336	{
337	struct drv2667_data *haptics;
338	int error;
339
340	haptics = devm_kzalloc(&client->dev, sizeof(*haptics), GFP_KERNEL);
341	if (!haptics)
342	return -ENOMEM;
343
344	haptics->regulator = devm_regulator_get(&client->dev, "vbat");
345	if (IS_ERR(haptics->regulator)) {
346	error = PTR_ERR(haptics->regulator);
347	dev_err(&client->dev,
348	"unable to get regulator, error: %d\n", error);
349	return error;
350	}
351
352	haptics->input_dev = devm_input_allocate_device(&client->dev);
353	if (!haptics->input_dev) {
354	dev_err(&client->dev, "Failed to allocate input device\n");
355	return -ENOMEM;
356	}
357
358	haptics->input_dev->name = "drv2667:haptics";
359	haptics->input_dev->dev.parent = client->dev.parent;
360	haptics->input_dev->close = drv2667_close;
361	input_set_drvdata(haptics->input_dev, haptics);
362	input_set_capability(haptics->input_dev, EV_FF, FF_RUMBLE);
363
364	error = input_ff_create_memless(haptics->input_dev, NULL,
365	drv2667_haptics_play);
366	if (error) {
367	dev_err(&client->dev, "input_ff_create() failed: %d\n",
368	error);
369	return error;
370	}
371
372	INIT_WORK(&haptics->work, drv2667_worker);
373
374	haptics->client = client;
375	i2c_set_clientdata(client, haptics);
376
377	haptics->regmap = devm_regmap_init_i2c(client, &drv2667_regmap_config);
378	if (IS_ERR(haptics->regmap)) {
379	error = PTR_ERR(haptics->regmap);
380	dev_err(&client->dev, "Failed to allocate register map: %d\n",
381	error);
382	return error;
383	}
384
385	error = drv2667_init(haptics);
386	if (error) {
387	dev_err(&client->dev, "Device init failed: %d\n", error);
388	return error;
389	}
390
391	error = input_register_device(haptics->input_dev);
392	if (error) {
393	dev_err(&client->dev, "couldn't register input device: %d\n",
394	error);
395	return error;
396	}
397
398	return 0;
399	}
400
97a652a8	401	static int __maybe_unused drv2667_suspend(struct device *dev)
1c246225 DM	402	{
	403	struct drv2667_data *haptics = dev_get_drvdata(dev);
	404	int ret = 0;
	405
	406	mutex_lock(&haptics->input_dev->mutex);
	407
	408	if (haptics->input_dev->users) {
	409	ret = regmap_update_bits(haptics->regmap, DRV2667_CTRL_2,
6473bbfd	410	DRV2667_STANDBY, DRV2667_STANDBY);
1c246225 DM	411	if (ret) {
	412	dev_err(dev, "Failed to set standby mode\n");
	413	regulator_disable(haptics->regulator);
	414	goto out;
	415	}
	416
	417	ret = regulator_disable(haptics->regulator);
	418	if (ret) {
	419	dev_err(dev, "Failed to disable regulator\n");
	420	regmap_update_bits(haptics->regmap,
	421	DRV2667_CTRL_2,
	422	DRV2667_STANDBY, 0);
	423	}
	424	}
	425	out:
	426	mutex_unlock(&haptics->input_dev->mutex);
	427	return ret;
	428	}
	429
97a652a8	430	static int __maybe_unused drv2667_resume(struct device *dev)
1c246225 DM	431	{
	432	struct drv2667_data *haptics = dev_get_drvdata(dev);
	433	int ret = 0;
	434
	435	mutex_lock(&haptics->input_dev->mutex);
	436
	437	if (haptics->input_dev->users) {
	438	ret = regulator_enable(haptics->regulator);
	439	if (ret) {
	440	dev_err(dev, "Failed to enable regulator\n");
	441	goto out;
	442	}
	443
	444	ret = regmap_update_bits(haptics->regmap, DRV2667_CTRL_2,
	445	DRV2667_STANDBY, 0);
	446	if (ret) {
	447	dev_err(dev, "Failed to unset standby mode\n");
	448	regulator_disable(haptics->regulator);
	449	goto out;
	450	}
	451
	452	}
	453
	454	out:
	455	mutex_unlock(&haptics->input_dev->mutex);
	456	return ret;
	457	}
1c246225 DM	458
	459	static SIMPLE_DEV_PM_OPS(drv2667_pm_ops, drv2667_suspend, drv2667_resume);
	460
	461	static const struct i2c_device_id drv2667_id[] = {
	462	{ "drv2667", 0 },
	463	{ }
	464	};
	465	MODULE_DEVICE_TABLE(i2c, drv2667_id);
	466
	467	#ifdef CONFIG_OF
	468	static const struct of_device_id drv2667_of_match[] = {
	469	{ .compatible = "ti,drv2667", },
	470	{ }
	471	};
	472	MODULE_DEVICE_TABLE(of, drv2667_of_match);
	473	#endif
	474
	475	static struct i2c_driver drv2667_driver = {
	476	.probe = drv2667_probe,
	477	.driver = {
	478	.name = "drv2667-haptics",
1c246225 DM	479	.of_match_table = of_match_ptr(drv2667_of_match),
	480	.pm = &drv2667_pm_ops,
	481	},
	482	.id_table = drv2667_id,
	483	};
	484	module_i2c_driver(drv2667_driver);
	485
1c246225 DM	486	MODULE_DESCRIPTION("TI DRV2667 haptics driver");
	487	MODULE_LICENSE("GPL");
	488	MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");