[thirdparty/kernel/stable.git] / drivers / regulator / lp8755.c

/*
 * 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>
 *
 * 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.
 *
 */

#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 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 regualtor 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 regualtor 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
b59320cc DJ	1	/*
	2	* LP8755 High Performance Power Management Unit : System Interface Driver
	3	* (based on rev. 0.26)
	4	* Copyright 2012 Texas Instruments
	5	*
	6	* Author: Daniel(Geon Si) Jeong <daniel.jeong@ti.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 as
	10	* published by the Free Software Foundation.
	11	*
	12	*/
	13
	14	#include <linux/module.h>
	15	#include <linux/slab.h>
	16	#include <linux/i2c.h>
	17	#include <linux/err.h>
	18	#include <linux/irq.h>
	19	#include <linux/interrupt.h>
	20	#include <linux/gpio.h>
	21	#include <linux/regmap.h>
b59320cc DJ	22	#include <linux/uaccess.h>
	23	#include <linux/regulator/driver.h>
	24	#include <linux/regulator/machine.h>
	25	#include <linux/platform_data/lp8755.h>
	26
	27	#define LP8755_REG_BUCK0 0x00
	28	#define LP8755_REG_BUCK1 0x03
	29	#define LP8755_REG_BUCK2 0x04
	30	#define LP8755_REG_BUCK3 0x01
	31	#define LP8755_REG_BUCK4 0x05
	32	#define LP8755_REG_BUCK5 0x02
	33	#define LP8755_REG_MAX 0xFF
	34
	35	#define LP8755_BUCK_EN_M BIT(7)
	36	#define LP8755_BUCK_LINEAR_OUT_MAX 0x76
	37	#define LP8755_BUCK_VOUT_M 0x7F
	38
b59320cc DJ	39	struct lp8755_mphase {
	40	int nreg;
	41	int buck_num[LP8755_BUCK_MAX];
	42	};
	43
	44	struct lp8755_chip {
	45	struct device *dev;
	46	struct regmap *regmap;
	47	struct lp8755_platform_data *pdata;
	48
	49	int irq;
	50	unsigned int irqmask;
	51
	52	int mphase;
	53	struct regulator_dev *rdev[LP8755_BUCK_MAX];
	54	};
	55
	56	/**
	57	*lp8755_read : read a single register value from lp8755.
	58	*@pchip : device to read from
	59	*@reg : register to read from
	60	*@val : pointer to store read value
	61	*/
	62	static int lp8755_read(struct lp8755_chip *pchip, unsigned int reg,
	63	unsigned int *val)
	64	{
	65	return regmap_read(pchip->regmap, reg, val);
	66	}
	67
	68	/**
	69	*lp8755_write : write a single register value to lp8755.
	70	*@pchip : device to write to
	71	*@reg : register to write to
	72	*@val : value to be written
	73	*/
	74	static int lp8755_write(struct lp8755_chip *pchip, unsigned int reg,
	75	unsigned int val)
	76	{
	77	return regmap_write(pchip->regmap, reg, val);
	78	}
	79
	80	/**
	81	*lp8755_update_bits : set the values of bit fields in lp8755 register.
	82	*@pchip : device to read from
	83	*@reg : register to update
	84	*@mask : bitmask to be changed
	85	*@val : value for bitmask
	86	*/
	87	static int lp8755_update_bits(struct lp8755_chip *pchip, unsigned int reg,
	88	unsigned int mask, unsigned int val)
	89	{
	90	return regmap_update_bits(pchip->regmap, reg, mask, val);
	91	}
	92
	93	static int lp8755_buck_enable_time(struct regulator_dev *rdev)
	94	{
	95	int ret;
	96	unsigned int regval;
	97	enum lp8755_bucks id = rdev_get_id(rdev);
	98	struct lp8755_chip *pchip = rdev_get_drvdata(rdev);
	99
	100	ret = lp8755_read(pchip, 0x12 + id, &regval);
	101	if (ret < 0) {
80aec6f5	102	dev_err(pchip->dev, "i2c access error %s\n", __func__);
b59320cc DJ	103	return ret;
	104	}
	105	return (regval & 0xff) * 100;
	106	}
	107
	108	static int lp8755_buck_set_mode(struct regulator_dev *rdev, unsigned int mode)
	109	{
	110	int ret;
	111	unsigned int regbval = 0x0;
	112	enum lp8755_bucks id = rdev_get_id(rdev);
	113	struct lp8755_chip *pchip = rdev_get_drvdata(rdev);
	114
	115	switch (mode) {
	116	case REGULATOR_MODE_FAST:
	117	/* forced pwm mode */
	118	regbval = (0x01 << id);
	119	break;
	120	case REGULATOR_MODE_NORMAL:
	121	/* enable automatic pwm/pfm mode */
	122	ret = lp8755_update_bits(pchip, 0x08 + id, 0x20, 0x00);
	123	if (ret < 0)
	124	goto err_i2c;
	125	break;
	126	case REGULATOR_MODE_IDLE:
	127	/* enable automatic pwm/pfm/lppfm mode */
	128	ret = lp8755_update_bits(pchip, 0x08 + id, 0x20, 0x20);
	129	if (ret < 0)
	130	goto err_i2c;
	131
	132	ret = lp8755_update_bits(pchip, 0x10, 0x01, 0x01);
	133	if (ret < 0)
	134	goto err_i2c;
	135	break;
	136	default:
	137	dev_err(pchip->dev, "Not supported buck mode %s\n", __func__);
	138	/* forced pwm mode */
	139	regbval = (0x01 << id);
	140	}
	141
	142	ret = lp8755_update_bits(pchip, 0x06, 0x01 << id, regbval);
	143	if (ret < 0)
	144	goto err_i2c;
	145	return ret;
	146	err_i2c:
80aec6f5	147	dev_err(pchip->dev, "i2c access error %s\n", __func__);
b59320cc DJ	148	return ret;
	149	}
	150
	151	static unsigned int lp8755_buck_get_mode(struct regulator_dev *rdev)
	152	{
	153	int ret;
	154	unsigned int regval;
	155	enum lp8755_bucks id = rdev_get_id(rdev);
	156	struct lp8755_chip *pchip = rdev_get_drvdata(rdev);
	157
	158	ret = lp8755_read(pchip, 0x06, &regval);
	159	if (ret < 0)
	160	goto err_i2c;
	161
	162	/* mode fast means forced pwm mode */
	163	if (regval & (0x01 << id))
	164	return REGULATOR_MODE_FAST;
	165
	166	ret = lp8755_read(pchip, 0x08 + id, &regval);
	167	if (ret < 0)
	168	goto err_i2c;
	169
	170	/* mode idle means automatic pwm/pfm/lppfm mode */
	171	if (regval & 0x20)
	172	return REGULATOR_MODE_IDLE;
	173
	174	/* mode normal means automatic pwm/pfm mode */
	175	return REGULATOR_MODE_NORMAL;
	176
	177	err_i2c:
80aec6f5	178	dev_err(pchip->dev, "i2c access error %s\n", __func__);
b59320cc DJ	179	return 0;
	180	}
	181
	182	static int lp8755_buck_set_ramp(struct regulator_dev *rdev, int ramp)
	183	{
	184	int ret;
	185	unsigned int regval = 0x00;
	186	enum lp8755_bucks id = rdev_get_id(rdev);
	187	struct lp8755_chip *pchip = rdev_get_drvdata(rdev);
	188
	189	/* uV/us */
	190	switch (ramp) {
	191	case 0 ... 230:
	192	regval = 0x07;
	193	break;
	194	case 231 ... 470:
	195	regval = 0x06;
	196	break;
	197	case 471 ... 940:
	198	regval = 0x05;
	199	break;
	200	case 941 ... 1900:
	201	regval = 0x04;
	202	break;
	203	case 1901 ... 3800:
	204	regval = 0x03;
	205	break;
	206	case 3801 ... 7500:
	207	regval = 0x02;
	208	break;
	209	case 7501 ... 15000:
	210	regval = 0x01;
	211	break;
	212	case 15001 ... 30000:
	213	regval = 0x00;
	214	break;
	215	default:
	216	dev_err(pchip->dev,
	217	"Not supported ramp value %d %s\n", ramp, __func__);
	218	return -EINVAL;
	219	}
	220
	221	ret = lp8755_update_bits(pchip, 0x07 + id, 0x07, regval);
	222	if (ret < 0)
	223	goto err_i2c;
	224	return ret;
	225	err_i2c:
80aec6f5	226	dev_err(pchip->dev, "i2c access error %s\n", __func__);
b59320cc DJ	227	return ret;
	228	}
	229
d42797a4	230	static const struct regulator_ops lp8755_buck_ops = {
56a942e9	231	.map_voltage = regulator_map_voltage_linear,
b59320cc DJ	232	.list_voltage = regulator_list_voltage_linear,
	233	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	234	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	235	.enable = regulator_enable_regmap,
	236	.disable = regulator_disable_regmap,
	237	.is_enabled = regulator_is_enabled_regmap,
	238	.enable_time = lp8755_buck_enable_time,
	239	.set_mode = lp8755_buck_set_mode,
	240	.get_mode = lp8755_buck_get_mode,
	241	.set_ramp_delay = lp8755_buck_set_ramp,
	242	};
	243
	244	#define lp8755_rail(_id) "lp8755_buck"#_id
	245	#define lp8755_buck_init(_id)\
	246	{\
	247	.constraints = {\
	248	.name = lp8755_rail(_id),\
	249	.valid_ops_mask = REGULATOR_CHANGE_VOLTAGE,\
	250	.min_uV = 500000,\
	251	.max_uV = 1675000,\
	252	},\
	253	}
	254
	255	static struct regulator_init_data lp8755_reg_default[LP8755_BUCK_MAX] = {
510799ea AL	256	[LP8755_BUCK0] = lp8755_buck_init(0),
	257	[LP8755_BUCK1] = lp8755_buck_init(1),
	258	[LP8755_BUCK2] = lp8755_buck_init(2),
	259	[LP8755_BUCK3] = lp8755_buck_init(3),
	260	[LP8755_BUCK4] = lp8755_buck_init(4),
	261	[LP8755_BUCK5] = lp8755_buck_init(5),
b59320cc DJ	262	};
	263
	264	static const struct lp8755_mphase mphase_buck[MPHASE_CONF_MAX] = {
510799ea AL	265	{ 3, { LP8755_BUCK0, LP8755_BUCK3, LP8755_BUCK5 } },
	266	{ 6, { LP8755_BUCK0, LP8755_BUCK1, LP8755_BUCK2, LP8755_BUCK3,
	267	LP8755_BUCK4, LP8755_BUCK5 } },
	268	{ 5, { LP8755_BUCK0, LP8755_BUCK2, LP8755_BUCK3, LP8755_BUCK4,
	269	LP8755_BUCK5} },
	270	{ 4, { LP8755_BUCK0, LP8755_BUCK3, LP8755_BUCK4, LP8755_BUCK5} },
	271	{ 3, { LP8755_BUCK0, LP8755_BUCK4, LP8755_BUCK5} },
	272	{ 2, { LP8755_BUCK0, LP8755_BUCK5} },
	273	{ 1, { LP8755_BUCK0} },
	274	{ 2, { LP8755_BUCK0, LP8755_BUCK3} },
	275	{ 4, { LP8755_BUCK0, LP8755_BUCK2, LP8755_BUCK3, LP8755_BUCK5} },
b59320cc DJ	276	};
	277
	278	static int lp8755_init_data(struct lp8755_chip *pchip)
	279	{
	280	unsigned int regval;
	281	int ret, icnt, buck_num;
	282	struct lp8755_platform_data *pdata = pchip->pdata;
	283
	284	/* read back muti-phase configuration */
	285	ret = lp8755_read(pchip, 0x3D, &regval);
	286	if (ret < 0)
	287	goto out_i2c_error;
cad877ef	288	pchip->mphase = regval & 0x0F;
b59320cc DJ	289
	290	/* set default data based on multi-phase config */
	291	for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++) {
	292	buck_num = mphase_buck[pchip->mphase].buck_num[icnt];
	293	pdata->buck_data[buck_num] = &lp8755_reg_default[buck_num];
	294	}
	295	return ret;
	296
	297	out_i2c_error:
80aec6f5	298	dev_err(pchip->dev, "i2c access error %s\n", __func__);
b59320cc DJ	299	return ret;
	300	}
	301
	302	#define lp8755_buck_desc(_id)\
	303	{\
	304	.name = lp8755_rail(_id),\
	305	.id = LP8755_BUCK##_id,\
	306	.ops = &lp8755_buck_ops,\
	307	.n_voltages = LP8755_BUCK_LINEAR_OUT_MAX+1,\
	308	.uV_step = 10000,\
	309	.min_uV = 500000,\
	310	.type = REGULATOR_VOLTAGE,\
	311	.owner = THIS_MODULE,\
	312	.enable_reg = LP8755_REG_BUCK##_id,\
	313	.enable_mask = LP8755_BUCK_EN_M,\
	314	.vsel_reg = LP8755_REG_BUCK##_id,\
	315	.vsel_mask = LP8755_BUCK_VOUT_M,\
	316	}
	317
	318	static struct regulator_desc lp8755_regulators[] = {
	319	lp8755_buck_desc(0),
	320	lp8755_buck_desc(1),
	321	lp8755_buck_desc(2),
	322	lp8755_buck_desc(3),
	323	lp8755_buck_desc(4),
	324	lp8755_buck_desc(5),
	325	};
	326
	327	static int lp8755_regulator_init(struct lp8755_chip *pchip)
	328	{
	329	int ret, icnt, buck_num;
	330	struct lp8755_platform_data *pdata = pchip->pdata;
	331	struct regulator_config rconfig = { };
	332
	333	rconfig.regmap = pchip->regmap;
	334	rconfig.dev = pchip->dev;
	335	rconfig.driver_data = pchip;
	336
	337	for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++) {
	338	buck_num = mphase_buck[pchip->mphase].buck_num[icnt];
	339	rconfig.init_data = pdata->buck_data[buck_num];
	340	rconfig.of_node = pchip->dev->of_node;
	341	pchip->rdev[buck_num] =
57135250 HS	342	devm_regulator_register(pchip->dev,
57135250 HS	343	&lp8755_regulators[buck_num], &rconfig);
b59320cc DJ	344	if (IS_ERR(pchip->rdev[buck_num])) {
b59320cc DJ	345	ret = PTR_ERR(pchip->rdev[buck_num]);
a1a41ab4 AL	346	pchip->rdev[buck_num] = NULL;
	347	dev_err(pchip->dev, "regulator init failed: buck %d\n",
	348	buck_num);
57135250	349	return ret;
b59320cc DJ	350	}
	351	}
	352
	353	return 0;
b59320cc DJ	354	}
	355
	356	static irqreturn_t lp8755_irq_handler(int irq, void *data)
	357	{
	358	int ret, icnt;
	359	unsigned int flag0, flag1;
	360	struct lp8755_chip *pchip = data;
	361
	362	/* read flag0 register */
	363	ret = lp8755_read(pchip, 0x0D, &flag0);
	364	if (ret < 0)
	365	goto err_i2c;
	366	/* clear flag register to pull up int. pin */
	367	ret = lp8755_write(pchip, 0x0D, 0x00);
	368	if (ret < 0)
	369	goto err_i2c;
	370
	371	/* sent power fault detection event to specific regulator */
1200c60b	372	for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
b59320cc DJ	373	if ((flag0 & (0x4 << icnt))
b59320cc DJ	374	&& (pchip->irqmask & (0x04 << icnt))
59c5dbc1 ST	375	&& (pchip->rdev[icnt] != NULL)) {
59c5dbc1 ST	376	regulator_lock(pchip->rdev[icnt]);
b59320cc DJ	377	regulator_notifier_call_chain(pchip->rdev[icnt],
	378	LP8755_EVENT_PWR_FAULT,
	379	NULL);
59c5dbc1 ST	380	regulator_unlock(pchip->rdev[icnt]);
59c5dbc1 ST	381	}
b59320cc DJ	382
	383	/* read flag1 register */
	384	ret = lp8755_read(pchip, 0x0E, &flag1);
	385	if (ret < 0)
	386	goto err_i2c;
	387	/* clear flag register to pull up int. pin */
	388	ret = lp8755_write(pchip, 0x0E, 0x00);
	389	if (ret < 0)
	390	goto err_i2c;
	391
	392	/* send OCP event to all regualtor devices */
	393	if ((flag1 & 0x01) && (pchip->irqmask & 0x01))
	394	for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
59c5dbc1 ST	395	if (pchip->rdev[icnt] != NULL) {
59c5dbc1 ST	396	regulator_lock(pchip->rdev[icnt]);
b59320cc DJ	397	regulator_notifier_call_chain(pchip->rdev[icnt],
	398	LP8755_EVENT_OCP,
	399	NULL);
59c5dbc1 ST	400	regulator_unlock(pchip->rdev[icnt]);
59c5dbc1 ST	401	}
b59320cc DJ	402
	403	/* send OVP event to all regualtor devices */
	404	if ((flag1 & 0x02) && (pchip->irqmask & 0x02))
	405	for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
59c5dbc1 ST	406	if (pchip->rdev[icnt] != NULL) {
59c5dbc1 ST	407	regulator_lock(pchip->rdev[icnt]);
b59320cc DJ	408	regulator_notifier_call_chain(pchip->rdev[icnt],
	409	LP8755_EVENT_OVP,
	410	NULL);
59c5dbc1 ST	411	regulator_unlock(pchip->rdev[icnt]);
59c5dbc1 ST	412	}
b59320cc DJ	413	return IRQ_HANDLED;
	414
	415	err_i2c:
80aec6f5	416	dev_err(pchip->dev, "i2c access error %s\n", __func__);
b59320cc DJ	417	return IRQ_NONE;
	418	}
	419
	420	static int lp8755_int_config(struct lp8755_chip *pchip)
	421	{
	422	int ret;
	423	unsigned int regval;
	424
	425	if (pchip->irq == 0) {
	426	dev_warn(pchip->dev, "not use interrupt : %s\n", __func__);
	427	return 0;
	428	}
	429
	430	ret = lp8755_read(pchip, 0x0F, &regval);
840499aa	431	if (ret < 0) {
80aec6f5	432	dev_err(pchip->dev, "i2c access error %s\n", __func__);
b59320cc	433	return ret;
840499aa	434	}
b59320cc	435
840499aa AL	436	pchip->irqmask = regval;
	437	return devm_request_threaded_irq(pchip->dev, pchip->irq, NULL,
	438	lp8755_irq_handler,
	439	IRQF_TRIGGER_FALLING \| IRQF_ONESHOT,
	440	"lp8755-irq", pchip);
b59320cc DJ	441	}
	442
	443	static const struct regmap_config lp8755_regmap = {
	444	.reg_bits = 8,
	445	.val_bits = 8,
	446	.max_register = LP8755_REG_MAX,
	447	};
	448
	449	static int lp8755_probe(struct i2c_client *client,
	450	const struct i2c_device_id *id)
	451	{
	452	int ret, icnt;
	453	struct lp8755_chip *pchip;
dff91d0b	454	struct lp8755_platform_data *pdata = dev_get_platdata(&client->dev);
b59320cc DJ	455
	456	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
	457	dev_err(&client->dev, "i2c functionality check fail.\n");
	458	return -EOPNOTSUPP;
	459	}
	460
	461	pchip = devm_kzalloc(&client->dev,
	462	sizeof(struct lp8755_chip), GFP_KERNEL);
	463	if (!pchip)
	464	return -ENOMEM;
	465
	466	pchip->dev = &client->dev;
	467	pchip->regmap = devm_regmap_init_i2c(client, &lp8755_regmap);
	468	if (IS_ERR(pchip->regmap)) {
	469	ret = PTR_ERR(pchip->regmap);
	470	dev_err(&client->dev, "fail to allocate regmap %d\n", ret);
	471	return ret;
	472	}
	473	i2c_set_clientdata(client, pchip);
	474
	475	if (pdata != NULL) {
	476	pchip->pdata = pdata;
	477	pchip->mphase = pdata->mphase;
	478	} else {
	479	pchip->pdata = devm_kzalloc(pchip->dev,
	480	sizeof(struct lp8755_platform_data),
	481	GFP_KERNEL);
	482	if (!pchip->pdata)
	483	return -ENOMEM;
	484	ret = lp8755_init_data(pchip);
240a5291 AL	485	if (ret < 0) {
	486	dev_err(&client->dev, "fail to initialize chip\n");
	487	return ret;
	488	}
b59320cc DJ	489	}
	490
	491	ret = lp8755_regulator_init(pchip);
240a5291 AL	492	if (ret < 0) {
240a5291 AL	493	dev_err(&client->dev, "fail to initialize regulators\n");
57135250	494	goto err;
240a5291	495	}
b59320cc DJ	496
	497	pchip->irq = client->irq;
	498	ret = lp8755_int_config(pchip);
240a5291 AL	499	if (ret < 0) {
240a5291 AL	500	dev_err(&client->dev, "fail to irq config\n");
57135250	501	goto err;
240a5291	502	}
b59320cc DJ	503
	504	return ret;
	505
57135250	506	err:
b59320cc	507	/* output disable */
1200c60b	508	for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
b59320cc DJ	509	lp8755_write(pchip, icnt, 0x00);
b59320cc DJ	510
b59320cc DJ	511	return ret;
	512	}
	513
	514	static int lp8755_remove(struct i2c_client *client)
	515	{
	516	int icnt;
	517	struct lp8755_chip *pchip = i2c_get_clientdata(client);
	518
1200c60b	519	for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
b59320cc DJ	520	lp8755_write(pchip, icnt, 0x00);
b59320cc DJ	521
b59320cc DJ	522	return 0;
	523	}
	524
	525	static const struct i2c_device_id lp8755_id[] = {
	526	{LP8755_NAME, 0},
	527	{}
	528	};
	529
	530	MODULE_DEVICE_TABLE(i2c, lp8755_id);
	531
	532	static struct i2c_driver lp8755_i2c_driver = {
	533	.driver = {
	534	.name = LP8755_NAME,
	535	},
	536	.probe = lp8755_probe,
a1a41ab4	537	.remove = lp8755_remove,
b59320cc DJ	538	.id_table = lp8755_id,
	539	};
	540
	541	static int __init lp8755_init(void)
	542	{
	543	return i2c_add_driver(&lp8755_i2c_driver);
	544	}
	545
	546	subsys_initcall(lp8755_init);
	547
	548	static void __exit lp8755_exit(void)
	549	{
	550	i2c_del_driver(&lp8755_i2c_driver);
	551	}
	552
	553	module_exit(lp8755_exit);
	554
	555	MODULE_DESCRIPTION("Texas Instruments lp8755 driver");
	556	MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>");
	557	MODULE_LICENSE("GPL v2");