[mirror_ubuntu-hirsute-kernel.git] / drivers / regulator / lp8755.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * LP8755 High Performance Power Management Unit : System Interface Driver
 * (based on rev. 0.26)
 * Copyright 2012 Texas Instruments
 *
 * Author: Daniel(Geon Si) Jeong <daniel.jeong@ti.com>
 */

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/err.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/gpio.h>
#include <linux/regmap.h>
#include <linux/uaccess.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/platform_data/lp8755.h>

#define LP8755_REG_BUCK0	0x00
#define LP8755_REG_BUCK1	0x03
#define LP8755_REG_BUCK2	0x04
#define LP8755_REG_BUCK3	0x01
#define LP8755_REG_BUCK4	0x05
#define LP8755_REG_BUCK5	0x02
#define LP8755_REG_MAX		0xFF

#define LP8755_BUCK_EN_M	BIT(7)
#define LP8755_BUCK_LINEAR_OUT_MAX	0x76
#define LP8755_BUCK_VOUT_M	0x7F

struct lp8755_mphase {
	int nreg;
	int buck_num[LP8755_BUCK_MAX];
};

struct lp8755_chip {
	struct device *dev;
	struct regmap *regmap;
	struct lp8755_platform_data *pdata;

	int irq;
	unsigned int irqmask;

	int mphase;
	struct regulator_dev *rdev[LP8755_BUCK_MAX];
};

/**
 *lp8755_read : read a single register value from lp8755.
 *@pchip : device to read from
 *@reg   : register to read from
 *@val   : pointer to store read value
 */
static int lp8755_read(struct lp8755_chip *pchip, unsigned int reg,
		       unsigned int *val)
{
	return regmap_read(pchip->regmap, reg, val);
}

/**
 *lp8755_write : write a single register value to lp8755.
 *@pchip : device to write to
 *@reg   : register to write to
 *@val   : value to be written
 */
static int lp8755_write(struct lp8755_chip *pchip, unsigned int reg,
			unsigned int val)
{
	return regmap_write(pchip->regmap, reg, val);
}

/**
 *lp8755_update_bits : set the values of bit fields in lp8755 register.
 *@pchip : device to read from
 *@reg   : register to update
 *@mask  : bitmask to be changed
 *@val   : value for bitmask
 */
static int lp8755_update_bits(struct lp8755_chip *pchip, unsigned int reg,
			      unsigned int mask, unsigned int val)
{
	return regmap_update_bits(pchip->regmap, reg, mask, val);
}

static int lp8755_buck_enable_time(struct regulator_dev *rdev)
{
	int ret;
	unsigned int regval;
	enum lp8755_bucks id = rdev_get_id(rdev);
	struct lp8755_chip *pchip = rdev_get_drvdata(rdev);

	ret = lp8755_read(pchip, 0x12 + id, &regval);
	if (ret < 0) {
		dev_err(pchip->dev, "i2c access error %s\n", __func__);
		return ret;
	}
	return (regval & 0xff) * 100;
}

static int lp8755_buck_set_mode(struct regulator_dev *rdev, unsigned int mode)
{
	int ret;
	unsigned int regbval = 0x0;
	enum lp8755_bucks id = rdev_get_id(rdev);
	struct lp8755_chip *pchip = rdev_get_drvdata(rdev);

	switch (mode) {
	case REGULATOR_MODE_FAST:
		/* forced pwm mode */
		regbval = (0x01 << id);
		break;
	case REGULATOR_MODE_NORMAL:
		/* enable automatic pwm/pfm mode */
		ret = lp8755_update_bits(pchip, 0x08 + id, 0x20, 0x00);
		if (ret < 0)
			goto err_i2c;
		break;
	case REGULATOR_MODE_IDLE:
		/* enable automatic pwm/pfm/lppfm mode */
		ret = lp8755_update_bits(pchip, 0x08 + id, 0x20, 0x20);
		if (ret < 0)
			goto err_i2c;

		ret = lp8755_update_bits(pchip, 0x10, 0x01, 0x01);
		if (ret < 0)
			goto err_i2c;
		break;
	default:
		dev_err(pchip->dev, "Not supported buck mode %s\n", __func__);
		/* forced pwm mode */
		regbval = (0x01 << id);
	}

	ret = lp8755_update_bits(pchip, 0x06, 0x01 << id, regbval);
	if (ret < 0)
		goto err_i2c;
	return ret;
err_i2c:
	dev_err(pchip->dev, "i2c access error %s\n", __func__);
	return ret;
}

static unsigned int lp8755_buck_get_mode(struct regulator_dev *rdev)
{
	int ret;
	unsigned int regval;
	enum lp8755_bucks id = rdev_get_id(rdev);
	struct lp8755_chip *pchip = rdev_get_drvdata(rdev);

	ret = lp8755_read(pchip, 0x06, &regval);
	if (ret < 0)
		goto err_i2c;

	/* mode fast means forced pwm mode */
	if (regval & (0x01 << id))
		return REGULATOR_MODE_FAST;

	ret = lp8755_read(pchip, 0x08 + id, &regval);
	if (ret < 0)
		goto err_i2c;

	/* mode idle means automatic pwm/pfm/lppfm mode */
	if (regval & 0x20)
		return REGULATOR_MODE_IDLE;

	/* mode normal means automatic pwm/pfm mode */
	return REGULATOR_MODE_NORMAL;

err_i2c:
	dev_err(pchip->dev, "i2c access error %s\n", __func__);
	return 0;
}

static int lp8755_buck_set_ramp(struct regulator_dev *rdev, int ramp)
{
	int ret;
	unsigned int regval = 0x00;
	enum lp8755_bucks id = rdev_get_id(rdev);
	struct lp8755_chip *pchip = rdev_get_drvdata(rdev);

	/* uV/us */
	switch (ramp) {
	case 0 ... 230:
		regval = 0x07;
		break;
	case 231 ... 470:
		regval = 0x06;
		break;
	case 471 ... 940:
		regval = 0x05;
		break;
	case 941 ... 1900:
		regval = 0x04;
		break;
	case 1901 ... 3800:
		regval = 0x03;
		break;
	case 3801 ... 7500:
		regval = 0x02;
		break;
	case 7501 ... 15000:
		regval = 0x01;
		break;
	case 15001 ... 30000:
		regval = 0x00;
		break;
	default:
		dev_err(pchip->dev,
			"Not supported ramp value %d %s\n", ramp, __func__);
		return -EINVAL;
	}

	ret = lp8755_update_bits(pchip, 0x07 + id, 0x07, regval);
	if (ret < 0)
		goto err_i2c;
	return ret;
err_i2c:
	dev_err(pchip->dev, "i2c access error %s\n", __func__);
	return ret;
}

static const struct regulator_ops lp8755_buck_ops = {
	.map_voltage = regulator_map_voltage_linear,
	.list_voltage = regulator_list_voltage_linear,
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	.is_enabled = regulator_is_enabled_regmap,
	.enable_time = lp8755_buck_enable_time,
	.set_mode = lp8755_buck_set_mode,
	.get_mode = lp8755_buck_get_mode,
	.set_ramp_delay = lp8755_buck_set_ramp,
};

#define lp8755_rail(_id) "lp8755_buck"#_id
#define lp8755_buck_init(_id)\
{\
	.constraints = {\
		.name = lp8755_rail(_id),\
		.valid_ops_mask = REGULATOR_CHANGE_VOLTAGE,\
		.min_uV = 500000,\
		.max_uV = 1675000,\
	},\
}

static struct regulator_init_data lp8755_reg_default[LP8755_BUCK_MAX] = {
	[LP8755_BUCK0] = lp8755_buck_init(0),
	[LP8755_BUCK1] = lp8755_buck_init(1),
	[LP8755_BUCK2] = lp8755_buck_init(2),
	[LP8755_BUCK3] = lp8755_buck_init(3),
	[LP8755_BUCK4] = lp8755_buck_init(4),
	[LP8755_BUCK5] = lp8755_buck_init(5),
};

static const struct lp8755_mphase mphase_buck[MPHASE_CONF_MAX] = {
	{ 3, { LP8755_BUCK0, LP8755_BUCK3, LP8755_BUCK5 } },
	{ 6, { LP8755_BUCK0, LP8755_BUCK1, LP8755_BUCK2, LP8755_BUCK3,
	       LP8755_BUCK4, LP8755_BUCK5 } },
	{ 5, { LP8755_BUCK0, LP8755_BUCK2, LP8755_BUCK3, LP8755_BUCK4,
	       LP8755_BUCK5} },
	{ 4, { LP8755_BUCK0, LP8755_BUCK3, LP8755_BUCK4, LP8755_BUCK5} },
	{ 3, { LP8755_BUCK0, LP8755_BUCK4, LP8755_BUCK5} },
	{ 2, { LP8755_BUCK0, LP8755_BUCK5} },
	{ 1, { LP8755_BUCK0} },
	{ 2, { LP8755_BUCK0, LP8755_BUCK3} },
	{ 4, { LP8755_BUCK0, LP8755_BUCK2, LP8755_BUCK3, LP8755_BUCK5} },
};

static int lp8755_init_data(struct lp8755_chip *pchip)
{
	unsigned int regval;
	int ret, icnt, buck_num;
	struct lp8755_platform_data *pdata = pchip->pdata;

	/* read back  muti-phase configuration */
	ret = lp8755_read(pchip, 0x3D, &regval);
	if (ret < 0)
		goto out_i2c_error;
	pchip->mphase = regval & 0x0F;

	/* set default data based on multi-phase config */
	for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++) {
		buck_num = mphase_buck[pchip->mphase].buck_num[icnt];
		pdata->buck_data[buck_num] = &lp8755_reg_default[buck_num];
	}
	return ret;

out_i2c_error:
	dev_err(pchip->dev, "i2c access error %s\n", __func__);
	return ret;
}

#define lp8755_buck_desc(_id)\
{\
	.name = lp8755_rail(_id),\
	.id   = LP8755_BUCK##_id,\
	.ops  = &lp8755_buck_ops,\
	.n_voltages = LP8755_BUCK_LINEAR_OUT_MAX+1,\
	.uV_step = 10000,\
	.min_uV = 500000,\
	.type = REGULATOR_VOLTAGE,\
	.owner = THIS_MODULE,\
	.enable_reg = LP8755_REG_BUCK##_id,\
	.enable_mask = LP8755_BUCK_EN_M,\
	.vsel_reg = LP8755_REG_BUCK##_id,\
	.vsel_mask = LP8755_BUCK_VOUT_M,\
}

static const struct regulator_desc lp8755_regulators[] = {
	lp8755_buck_desc(0),
	lp8755_buck_desc(1),
	lp8755_buck_desc(2),
	lp8755_buck_desc(3),
	lp8755_buck_desc(4),
	lp8755_buck_desc(5),
};

static int lp8755_regulator_init(struct lp8755_chip *pchip)
{
	int ret, icnt, buck_num;
	struct lp8755_platform_data *pdata = pchip->pdata;
	struct regulator_config rconfig = { };

	rconfig.regmap = pchip->regmap;
	rconfig.dev = pchip->dev;
	rconfig.driver_data = pchip;

	for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++) {
		buck_num = mphase_buck[pchip->mphase].buck_num[icnt];
		rconfig.init_data = pdata->buck_data[buck_num];
		rconfig.of_node = pchip->dev->of_node;
		pchip->rdev[buck_num] =
		    devm_regulator_register(pchip->dev,
				    &lp8755_regulators[buck_num], &rconfig);
		if (IS_ERR(pchip->rdev[buck_num])) {
			ret = PTR_ERR(pchip->rdev[buck_num]);
			pchip->rdev[buck_num] = NULL;
			dev_err(pchip->dev, "regulator init failed: buck %d\n",
				buck_num);
			return ret;
		}
	}

	return 0;
}

static irqreturn_t lp8755_irq_handler(int irq, void *data)
{
	int ret, icnt;
	unsigned int flag0, flag1;
	struct lp8755_chip *pchip = data;

	/* read flag0 register */
	ret = lp8755_read(pchip, 0x0D, &flag0);
	if (ret < 0)
		goto err_i2c;
	/* clear flag register to pull up int. pin */
	ret = lp8755_write(pchip, 0x0D, 0x00);
	if (ret < 0)
		goto err_i2c;

	/* sent power fault detection event to specific regulator */
	for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
		if ((flag0 & (0x4 << icnt))
		    && (pchip->irqmask & (0x04 << icnt))
		    && (pchip->rdev[icnt] != NULL)) {
			regulator_lock(pchip->rdev[icnt]);
			regulator_notifier_call_chain(pchip->rdev[icnt],
						      LP8755_EVENT_PWR_FAULT,
						      NULL);
			regulator_unlock(pchip->rdev[icnt]);
		}

	/* read flag1 register */
	ret = lp8755_read(pchip, 0x0E, &flag1);
	if (ret < 0)
		goto err_i2c;
	/* clear flag register to pull up int. pin */
	ret = lp8755_write(pchip, 0x0E, 0x00);
	if (ret < 0)
		goto err_i2c;

	/* send OCP event to all regulator devices */
	if ((flag1 & 0x01) && (pchip->irqmask & 0x01))
		for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
			if (pchip->rdev[icnt] != NULL) {
				regulator_lock(pchip->rdev[icnt]);
				regulator_notifier_call_chain(pchip->rdev[icnt],
							      LP8755_EVENT_OCP,
							      NULL);
				regulator_unlock(pchip->rdev[icnt]);
			}

	/* send OVP event to all regulator devices */
	if ((flag1 & 0x02) && (pchip->irqmask & 0x02))
		for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
			if (pchip->rdev[icnt] != NULL) {
				regulator_lock(pchip->rdev[icnt]);
				regulator_notifier_call_chain(pchip->rdev[icnt],
							      LP8755_EVENT_OVP,
							      NULL);
				regulator_unlock(pchip->rdev[icnt]);
			}
	return IRQ_HANDLED;

err_i2c:
	dev_err(pchip->dev, "i2c access error %s\n", __func__);
	return IRQ_NONE;
}

static int lp8755_int_config(struct lp8755_chip *pchip)
{
	int ret;
	unsigned int regval;

	if (pchip->irq == 0) {
		dev_warn(pchip->dev, "not use interrupt : %s\n", __func__);
		return 0;
	}

	ret = lp8755_read(pchip, 0x0F, &regval);
	if (ret < 0) {
		dev_err(pchip->dev, "i2c access error %s\n", __func__);
		return ret;
	}

	pchip->irqmask = regval;
	return devm_request_threaded_irq(pchip->dev, pchip->irq, NULL,
					 lp8755_irq_handler,
					 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
					 "lp8755-irq", pchip);
}

static const struct regmap_config lp8755_regmap = {
	.reg_bits = 8,
	.val_bits = 8,
	.max_register = LP8755_REG_MAX,
};

static int lp8755_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
{
	int ret, icnt;
	struct lp8755_chip *pchip;
	struct lp8755_platform_data *pdata = dev_get_platdata(&client->dev);

	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
		dev_err(&client->dev, "i2c functionality check fail.\n");
		return -EOPNOTSUPP;
	}

	pchip = devm_kzalloc(&client->dev,
			     sizeof(struct lp8755_chip), GFP_KERNEL);
	if (!pchip)
		return -ENOMEM;

	pchip->dev = &client->dev;
	pchip->regmap = devm_regmap_init_i2c(client, &lp8755_regmap);
	if (IS_ERR(pchip->regmap)) {
		ret = PTR_ERR(pchip->regmap);
		dev_err(&client->dev, "fail to allocate regmap %d\n", ret);
		return ret;
	}
	i2c_set_clientdata(client, pchip);

	if (pdata != NULL) {
		pchip->pdata = pdata;
		pchip->mphase = pdata->mphase;
	} else {
		pchip->pdata = devm_kzalloc(pchip->dev,
					    sizeof(struct lp8755_platform_data),
					    GFP_KERNEL);
		if (!pchip->pdata)
			return -ENOMEM;
		ret = lp8755_init_data(pchip);
		if (ret < 0) {
			dev_err(&client->dev, "fail to initialize chip\n");
			return ret;
		}
	}

	ret = lp8755_regulator_init(pchip);
	if (ret < 0) {
		dev_err(&client->dev, "fail to initialize regulators\n");
		goto err;
	}

	pchip->irq = client->irq;
	ret = lp8755_int_config(pchip);
	if (ret < 0) {
		dev_err(&client->dev, "fail to irq config\n");
		goto err;
	}

	return ret;

err:
	/* output disable */
	for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
		lp8755_write(pchip, icnt, 0x00);

	return ret;
}

static int lp8755_remove(struct i2c_client *client)
{
	int icnt;
	struct lp8755_chip *pchip = i2c_get_clientdata(client);

	for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
		lp8755_write(pchip, icnt, 0x00);

	return 0;
}

static const struct i2c_device_id lp8755_id[] = {
	{LP8755_NAME, 0},
	{}
};

MODULE_DEVICE_TABLE(i2c, lp8755_id);

static struct i2c_driver lp8755_i2c_driver = {
	.driver = {
		   .name = LP8755_NAME,
		   },
	.probe = lp8755_probe,
	.remove = lp8755_remove,
	.id_table = lp8755_id,
};

static int __init lp8755_init(void)
{
	return i2c_add_driver(&lp8755_i2c_driver);
}

subsys_initcall(lp8755_init);

static void __exit lp8755_exit(void)
{
	i2c_del_driver(&lp8755_i2c_driver);
}

module_exit(lp8755_exit);

MODULE_DESCRIPTION("Texas Instruments lp8755 driver");
MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
b59320cc DJ	2	/*
	3	* LP8755 High Performance Power Management Unit : System Interface Driver
	4	* (based on rev. 0.26)
	5	* Copyright 2012 Texas Instruments
	6	*
	7	* Author: Daniel(Geon Si) Jeong <daniel.jeong@ti.com>
b59320cc DJ	8	*/
	9
	10	#include <linux/module.h>
	11	#include <linux/slab.h>
	12	#include <linux/i2c.h>
	13	#include <linux/err.h>
	14	#include <linux/irq.h>
	15	#include <linux/interrupt.h>
	16	#include <linux/gpio.h>
	17	#include <linux/regmap.h>
b59320cc DJ	18	#include <linux/uaccess.h>
	19	#include <linux/regulator/driver.h>
	20	#include <linux/regulator/machine.h>
	21	#include <linux/platform_data/lp8755.h>
	22
	23	#define LP8755_REG_BUCK0 0x00
	24	#define LP8755_REG_BUCK1 0x03
	25	#define LP8755_REG_BUCK2 0x04
	26	#define LP8755_REG_BUCK3 0x01
	27	#define LP8755_REG_BUCK4 0x05
	28	#define LP8755_REG_BUCK5 0x02
	29	#define LP8755_REG_MAX 0xFF
	30
	31	#define LP8755_BUCK_EN_M BIT(7)
	32	#define LP8755_BUCK_LINEAR_OUT_MAX 0x76
	33	#define LP8755_BUCK_VOUT_M 0x7F
	34
b59320cc DJ	35	struct lp8755_mphase {
	36	int nreg;
	37	int buck_num[LP8755_BUCK_MAX];
	38	};
	39
	40	struct lp8755_chip {
	41	struct device *dev;
	42	struct regmap *regmap;
	43	struct lp8755_platform_data *pdata;
	44
	45	int irq;
	46	unsigned int irqmask;
	47
	48	int mphase;
	49	struct regulator_dev *rdev[LP8755_BUCK_MAX];
	50	};
	51
	52	/**
	53	*lp8755_read : read a single register value from lp8755.
	54	*@pchip : device to read from
	55	*@reg : register to read from
	56	*@val : pointer to store read value
	57	*/
	58	static int lp8755_read(struct lp8755_chip *pchip, unsigned int reg,
	59	unsigned int *val)
	60	{
	61	return regmap_read(pchip->regmap, reg, val);
	62	}
	63
	64	/**
	65	*lp8755_write : write a single register value to lp8755.
	66	*@pchip : device to write to
	67	*@reg : register to write to
	68	*@val : value to be written
	69	*/
	70	static int lp8755_write(struct lp8755_chip *pchip, unsigned int reg,
	71	unsigned int val)
	72	{
	73	return regmap_write(pchip->regmap, reg, val);
	74	}
	75
	76	/**
	77	*lp8755_update_bits : set the values of bit fields in lp8755 register.
	78	*@pchip : device to read from
	79	*@reg : register to update
	80	*@mask : bitmask to be changed
	81	*@val : value for bitmask
	82	*/
	83	static int lp8755_update_bits(struct lp8755_chip *pchip, unsigned int reg,
	84	unsigned int mask, unsigned int val)
	85	{
	86	return regmap_update_bits(pchip->regmap, reg, mask, val);
	87	}
	88
	89	static int lp8755_buck_enable_time(struct regulator_dev *rdev)
	90	{
	91	int ret;
	92	unsigned int regval;
	93	enum lp8755_bucks id = rdev_get_id(rdev);
	94	struct lp8755_chip *pchip = rdev_get_drvdata(rdev);
	95
	96	ret = lp8755_read(pchip, 0x12 + id, &regval);
	97	if (ret < 0) {
80aec6f5	98	dev_err(pchip->dev, "i2c access error %s\n", __func__);
b59320cc DJ	99	return ret;
	100	}
	101	return (regval & 0xff) * 100;
	102	}
	103
	104	static int lp8755_buck_set_mode(struct regulator_dev *rdev, unsigned int mode)
	105	{
	106	int ret;
	107	unsigned int regbval = 0x0;
	108	enum lp8755_bucks id = rdev_get_id(rdev);
	109	struct lp8755_chip *pchip = rdev_get_drvdata(rdev);
	110
	111	switch (mode) {
	112	case REGULATOR_MODE_FAST:
	113	/* forced pwm mode */
	114	regbval = (0x01 << id);
	115	break;
	116	case REGULATOR_MODE_NORMAL:
	117	/* enable automatic pwm/pfm mode */
	118	ret = lp8755_update_bits(pchip, 0x08 + id, 0x20, 0x00);
	119	if (ret < 0)
	120	goto err_i2c;
	121	break;
	122	case REGULATOR_MODE_IDLE:
	123	/* enable automatic pwm/pfm/lppfm mode */
	124	ret = lp8755_update_bits(pchip, 0x08 + id, 0x20, 0x20);
	125	if (ret < 0)
	126	goto err_i2c;
	127
	128	ret = lp8755_update_bits(pchip, 0x10, 0x01, 0x01);
	129	if (ret < 0)
	130	goto err_i2c;
	131	break;
	132	default:
	133	dev_err(pchip->dev, "Not supported buck mode %s\n", __func__);
	134	/* forced pwm mode */
	135	regbval = (0x01 << id);
	136	}
	137
	138	ret = lp8755_update_bits(pchip, 0x06, 0x01 << id, regbval);
	139	if (ret < 0)
	140	goto err_i2c;
	141	return ret;
	142	err_i2c:
80aec6f5	143	dev_err(pchip->dev, "i2c access error %s\n", __func__);
b59320cc DJ	144	return ret;
	145	}
	146
	147	static unsigned int lp8755_buck_get_mode(struct regulator_dev *rdev)
	148	{
	149	int ret;
	150	unsigned int regval;
	151	enum lp8755_bucks id = rdev_get_id(rdev);
	152	struct lp8755_chip *pchip = rdev_get_drvdata(rdev);
	153
	154	ret = lp8755_read(pchip, 0x06, &regval);
	155	if (ret < 0)
	156	goto err_i2c;
	157
	158	/* mode fast means forced pwm mode */
	159	if (regval & (0x01 << id))
	160	return REGULATOR_MODE_FAST;
	161
	162	ret = lp8755_read(pchip, 0x08 + id, &regval);
	163	if (ret < 0)
	164	goto err_i2c;
	165
	166	/* mode idle means automatic pwm/pfm/lppfm mode */
	167	if (regval & 0x20)
	168	return REGULATOR_MODE_IDLE;
	169
	170	/* mode normal means automatic pwm/pfm mode */
	171	return REGULATOR_MODE_NORMAL;
	172
	173	err_i2c:
80aec6f5	174	dev_err(pchip->dev, "i2c access error %s\n", __func__);
b59320cc DJ	175	return 0;
	176	}
	177
	178	static int lp8755_buck_set_ramp(struct regulator_dev *rdev, int ramp)
	179	{
	180	int ret;
	181	unsigned int regval = 0x00;
	182	enum lp8755_bucks id = rdev_get_id(rdev);
	183	struct lp8755_chip *pchip = rdev_get_drvdata(rdev);
	184
	185	/* uV/us */
	186	switch (ramp) {
	187	case 0 ... 230:
	188	regval = 0x07;
	189	break;
	190	case 231 ... 470:
	191	regval = 0x06;
	192	break;
	193	case 471 ... 940:
	194	regval = 0x05;
	195	break;
	196	case 941 ... 1900:
	197	regval = 0x04;
	198	break;
	199	case 1901 ... 3800:
	200	regval = 0x03;
	201	break;
	202	case 3801 ... 7500:
	203	regval = 0x02;
	204	break;
	205	case 7501 ... 15000:
	206	regval = 0x01;
	207	break;
	208	case 15001 ... 30000:
	209	regval = 0x00;
	210	break;
	211	default:
	212	dev_err(pchip->dev,
	213	"Not supported ramp value %d %s\n", ramp, __func__);
	214	return -EINVAL;
	215	}
	216
	217	ret = lp8755_update_bits(pchip, 0x07 + id, 0x07, regval);
	218	if (ret < 0)
	219	goto err_i2c;
	220	return ret;
	221	err_i2c:
80aec6f5	222	dev_err(pchip->dev, "i2c access error %s\n", __func__);
b59320cc DJ	223	return ret;
	224	}
	225
d42797a4	226	static const struct regulator_ops lp8755_buck_ops = {
56a942e9	227	.map_voltage = regulator_map_voltage_linear,
b59320cc DJ	228	.list_voltage = regulator_list_voltage_linear,
	229	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	230	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	231	.enable = regulator_enable_regmap,
	232	.disable = regulator_disable_regmap,
	233	.is_enabled = regulator_is_enabled_regmap,
	234	.enable_time = lp8755_buck_enable_time,
	235	.set_mode = lp8755_buck_set_mode,
	236	.get_mode = lp8755_buck_get_mode,
	237	.set_ramp_delay = lp8755_buck_set_ramp,
	238	};
	239
	240	#define lp8755_rail(_id) "lp8755_buck"#_id
	241	#define lp8755_buck_init(_id)\
	242	{\
	243	.constraints = {\
	244	.name = lp8755_rail(_id),\
	245	.valid_ops_mask = REGULATOR_CHANGE_VOLTAGE,\
	246	.min_uV = 500000,\
	247	.max_uV = 1675000,\
	248	},\
	249	}
	250
	251	static struct regulator_init_data lp8755_reg_default[LP8755_BUCK_MAX] = {
510799ea AL	252	[LP8755_BUCK0] = lp8755_buck_init(0),
	253	[LP8755_BUCK1] = lp8755_buck_init(1),
	254	[LP8755_BUCK2] = lp8755_buck_init(2),
	255	[LP8755_BUCK3] = lp8755_buck_init(3),
	256	[LP8755_BUCK4] = lp8755_buck_init(4),
	257	[LP8755_BUCK5] = lp8755_buck_init(5),
b59320cc DJ	258	};
	259
	260	static const struct lp8755_mphase mphase_buck[MPHASE_CONF_MAX] = {
510799ea AL	261	{ 3, { LP8755_BUCK0, LP8755_BUCK3, LP8755_BUCK5 } },
	262	{ 6, { LP8755_BUCK0, LP8755_BUCK1, LP8755_BUCK2, LP8755_BUCK3,
	263	LP8755_BUCK4, LP8755_BUCK5 } },
	264	{ 5, { LP8755_BUCK0, LP8755_BUCK2, LP8755_BUCK3, LP8755_BUCK4,
	265	LP8755_BUCK5} },
	266	{ 4, { LP8755_BUCK0, LP8755_BUCK3, LP8755_BUCK4, LP8755_BUCK5} },
	267	{ 3, { LP8755_BUCK0, LP8755_BUCK4, LP8755_BUCK5} },
	268	{ 2, { LP8755_BUCK0, LP8755_BUCK5} },
	269	{ 1, { LP8755_BUCK0} },
	270	{ 2, { LP8755_BUCK0, LP8755_BUCK3} },
	271	{ 4, { LP8755_BUCK0, LP8755_BUCK2, LP8755_BUCK3, LP8755_BUCK5} },
b59320cc DJ	272	};
	273
	274	static int lp8755_init_data(struct lp8755_chip *pchip)
	275	{
	276	unsigned int regval;
	277	int ret, icnt, buck_num;
	278	struct lp8755_platform_data *pdata = pchip->pdata;
	279
	280	/* read back muti-phase configuration */
	281	ret = lp8755_read(pchip, 0x3D, &regval);
	282	if (ret < 0)
	283	goto out_i2c_error;
cad877ef	284	pchip->mphase = regval & 0x0F;
b59320cc DJ	285
	286	/* set default data based on multi-phase config */
	287	for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++) {
	288	buck_num = mphase_buck[pchip->mphase].buck_num[icnt];
	289	pdata->buck_data[buck_num] = &lp8755_reg_default[buck_num];
	290	}
	291	return ret;
	292
	293	out_i2c_error:
80aec6f5	294	dev_err(pchip->dev, "i2c access error %s\n", __func__);
b59320cc DJ	295	return ret;
	296	}
	297
	298	#define lp8755_buck_desc(_id)\
	299	{\
	300	.name = lp8755_rail(_id),\
	301	.id = LP8755_BUCK##_id,\
	302	.ops = &lp8755_buck_ops,\
	303	.n_voltages = LP8755_BUCK_LINEAR_OUT_MAX+1,\
	304	.uV_step = 10000,\
	305	.min_uV = 500000,\
	306	.type = REGULATOR_VOLTAGE,\
	307	.owner = THIS_MODULE,\
	308	.enable_reg = LP8755_REG_BUCK##_id,\
	309	.enable_mask = LP8755_BUCK_EN_M,\
	310	.vsel_reg = LP8755_REG_BUCK##_id,\
	311	.vsel_mask = LP8755_BUCK_VOUT_M,\
	312	}
	313
367e90d1	314	static const struct regulator_desc lp8755_regulators[] = {
b59320cc DJ	315	lp8755_buck_desc(0),
	316	lp8755_buck_desc(1),
	317	lp8755_buck_desc(2),
	318	lp8755_buck_desc(3),
	319	lp8755_buck_desc(4),
	320	lp8755_buck_desc(5),
	321	};
	322
	323	static int lp8755_regulator_init(struct lp8755_chip *pchip)
	324	{
	325	int ret, icnt, buck_num;
	326	struct lp8755_platform_data *pdata = pchip->pdata;
	327	struct regulator_config rconfig = { };
	328
	329	rconfig.regmap = pchip->regmap;
	330	rconfig.dev = pchip->dev;
	331	rconfig.driver_data = pchip;
	332
	333	for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++) {
	334	buck_num = mphase_buck[pchip->mphase].buck_num[icnt];
	335	rconfig.init_data = pdata->buck_data[buck_num];
	336	rconfig.of_node = pchip->dev->of_node;
	337	pchip->rdev[buck_num] =
57135250 HS	338	devm_regulator_register(pchip->dev,
57135250 HS	339	&lp8755_regulators[buck_num], &rconfig);
b59320cc DJ	340	if (IS_ERR(pchip->rdev[buck_num])) {
b59320cc DJ	341	ret = PTR_ERR(pchip->rdev[buck_num]);
a1a41ab4 AL	342	pchip->rdev[buck_num] = NULL;
	343	dev_err(pchip->dev, "regulator init failed: buck %d\n",
	344	buck_num);
57135250	345	return ret;
b59320cc DJ	346	}
	347	}
	348
	349	return 0;
b59320cc DJ	350	}
	351
	352	static irqreturn_t lp8755_irq_handler(int irq, void *data)
	353	{
	354	int ret, icnt;
	355	unsigned int flag0, flag1;
	356	struct lp8755_chip *pchip = data;
	357
	358	/* read flag0 register */
	359	ret = lp8755_read(pchip, 0x0D, &flag0);
	360	if (ret < 0)
	361	goto err_i2c;
	362	/* clear flag register to pull up int. pin */
	363	ret = lp8755_write(pchip, 0x0D, 0x00);
	364	if (ret < 0)
	365	goto err_i2c;
	366
	367	/* sent power fault detection event to specific regulator */
1200c60b	368	for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
b59320cc DJ	369	if ((flag0 & (0x4 << icnt))
b59320cc DJ	370	&& (pchip->irqmask & (0x04 << icnt))
89b2758c ST	371	&& (pchip->rdev[icnt] != NULL)) {
89b2758c ST	372	regulator_lock(pchip->rdev[icnt]);
b59320cc DJ	373	regulator_notifier_call_chain(pchip->rdev[icnt],
	374	LP8755_EVENT_PWR_FAULT,
	375	NULL);
89b2758c ST	376	regulator_unlock(pchip->rdev[icnt]);
89b2758c ST	377	}
b59320cc DJ	378
	379	/* read flag1 register */
	380	ret = lp8755_read(pchip, 0x0E, &flag1);
	381	if (ret < 0)
	382	goto err_i2c;
	383	/* clear flag register to pull up int. pin */
	384	ret = lp8755_write(pchip, 0x0E, 0x00);
	385	if (ret < 0)
	386	goto err_i2c;
	387
48f1b4ef	388	/* send OCP event to all regulator devices */
b59320cc DJ	389	if ((flag1 & 0x01) && (pchip->irqmask & 0x01))
b59320cc DJ	390	for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
89b2758c ST	391	if (pchip->rdev[icnt] != NULL) {
89b2758c ST	392	regulator_lock(pchip->rdev[icnt]);
b59320cc DJ	393	regulator_notifier_call_chain(pchip->rdev[icnt],
	394	LP8755_EVENT_OCP,
	395	NULL);
89b2758c ST	396	regulator_unlock(pchip->rdev[icnt]);
89b2758c ST	397	}
b59320cc	398
48f1b4ef	399	/* send OVP event to all regulator devices */
b59320cc DJ	400	if ((flag1 & 0x02) && (pchip->irqmask & 0x02))
b59320cc DJ	401	for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
89b2758c ST	402	if (pchip->rdev[icnt] != NULL) {
89b2758c ST	403	regulator_lock(pchip->rdev[icnt]);
b59320cc DJ	404	regulator_notifier_call_chain(pchip->rdev[icnt],
	405	LP8755_EVENT_OVP,
	406	NULL);
89b2758c ST	407	regulator_unlock(pchip->rdev[icnt]);
89b2758c ST	408	}
b59320cc DJ	409	return IRQ_HANDLED;
	410
	411	err_i2c:
80aec6f5	412	dev_err(pchip->dev, "i2c access error %s\n", __func__);
b59320cc DJ	413	return IRQ_NONE;
	414	}
	415
	416	static int lp8755_int_config(struct lp8755_chip *pchip)
	417	{
	418	int ret;
	419	unsigned int regval;
	420
	421	if (pchip->irq == 0) {
	422	dev_warn(pchip->dev, "not use interrupt : %s\n", __func__);
	423	return 0;
	424	}
	425
	426	ret = lp8755_read(pchip, 0x0F, &regval);
840499aa	427	if (ret < 0) {
80aec6f5	428	dev_err(pchip->dev, "i2c access error %s\n", __func__);
b59320cc	429	return ret;
840499aa	430	}
b59320cc	431
840499aa AL	432	pchip->irqmask = regval;
	433	return devm_request_threaded_irq(pchip->dev, pchip->irq, NULL,
	434	lp8755_irq_handler,
	435	IRQF_TRIGGER_FALLING \| IRQF_ONESHOT,
	436	"lp8755-irq", pchip);
b59320cc DJ	437	}
	438
	439	static const struct regmap_config lp8755_regmap = {
	440	.reg_bits = 8,
	441	.val_bits = 8,
	442	.max_register = LP8755_REG_MAX,
	443	};
	444
	445	static int lp8755_probe(struct i2c_client *client,
	446	const struct i2c_device_id *id)
	447	{
	448	int ret, icnt;
	449	struct lp8755_chip *pchip;
dff91d0b	450	struct lp8755_platform_data *pdata = dev_get_platdata(&client->dev);
b59320cc DJ	451
	452	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
	453	dev_err(&client->dev, "i2c functionality check fail.\n");
	454	return -EOPNOTSUPP;
	455	}
	456
	457	pchip = devm_kzalloc(&client->dev,
	458	sizeof(struct lp8755_chip), GFP_KERNEL);
	459	if (!pchip)
	460	return -ENOMEM;
	461
	462	pchip->dev = &client->dev;
	463	pchip->regmap = devm_regmap_init_i2c(client, &lp8755_regmap);
	464	if (IS_ERR(pchip->regmap)) {
	465	ret = PTR_ERR(pchip->regmap);
	466	dev_err(&client->dev, "fail to allocate regmap %d\n", ret);
	467	return ret;
	468	}
	469	i2c_set_clientdata(client, pchip);
	470
	471	if (pdata != NULL) {
	472	pchip->pdata = pdata;
	473	pchip->mphase = pdata->mphase;
	474	} else {
	475	pchip->pdata = devm_kzalloc(pchip->dev,
	476	sizeof(struct lp8755_platform_data),
	477	GFP_KERNEL);
	478	if (!pchip->pdata)
	479	return -ENOMEM;
	480	ret = lp8755_init_data(pchip);
240a5291 AL	481	if (ret < 0) {
	482	dev_err(&client->dev, "fail to initialize chip\n");
	483	return ret;
	484	}
b59320cc DJ	485	}
	486
	487	ret = lp8755_regulator_init(pchip);
240a5291 AL	488	if (ret < 0) {
240a5291 AL	489	dev_err(&client->dev, "fail to initialize regulators\n");
57135250	490	goto err;
240a5291	491	}
b59320cc DJ	492
	493	pchip->irq = client->irq;
	494	ret = lp8755_int_config(pchip);
240a5291 AL	495	if (ret < 0) {
240a5291 AL	496	dev_err(&client->dev, "fail to irq config\n");
57135250	497	goto err;
240a5291	498	}
b59320cc DJ	499
	500	return ret;
	501
57135250	502	err:
b59320cc	503	/* output disable */
1200c60b	504	for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
b59320cc DJ	505	lp8755_write(pchip, icnt, 0x00);
b59320cc DJ	506
b59320cc DJ	507	return ret;
	508	}
	509
	510	static int lp8755_remove(struct i2c_client *client)
	511	{
	512	int icnt;
	513	struct lp8755_chip *pchip = i2c_get_clientdata(client);
	514
1200c60b	515	for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
b59320cc DJ	516	lp8755_write(pchip, icnt, 0x00);
b59320cc DJ	517
b59320cc DJ	518	return 0;
	519	}
	520
	521	static const struct i2c_device_id lp8755_id[] = {
	522	{LP8755_NAME, 0},
	523	{}
	524	};
	525
	526	MODULE_DEVICE_TABLE(i2c, lp8755_id);
	527
	528	static struct i2c_driver lp8755_i2c_driver = {
	529	.driver = {
	530	.name = LP8755_NAME,
	531	},
	532	.probe = lp8755_probe,
a1a41ab4	533	.remove = lp8755_remove,
b59320cc DJ	534	.id_table = lp8755_id,
	535	};
	536
	537	static int __init lp8755_init(void)
	538	{
	539	return i2c_add_driver(&lp8755_i2c_driver);
	540	}
	541
	542	subsys_initcall(lp8755_init);
	543
	544	static void __exit lp8755_exit(void)
	545	{
	546	i2c_del_driver(&lp8755_i2c_driver);
	547	}
	548
	549	module_exit(lp8755_exit);
	550
	551	MODULE_DESCRIPTION("Texas Instruments lp8755 driver");
	552	MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>");
	553	MODULE_LICENSE("GPL v2");