[linux.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 <[email protected]>
 *
 * 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/delay.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 acceess 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 acceess 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 acceess 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 acceess error %s\n", __func__);
	return ret;
}

static struct regulator_ops lp8755_buck_ops = {
	.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 acceess 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] =
		    regulator_register(&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);
			goto err_buck;
		}
	}

	return 0;

err_buck:
	for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
		regulator_unregister(pchip->rdev[icnt]);
	return ret;
}

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 < 6; icnt++)
		if ((flag0 & (0x4 << icnt))
		    && (pchip->irqmask & (0x04 << icnt))
		    && (pchip->rdev[icnt] != NULL))
			regulator_notifier_call_chain(pchip->rdev[icnt],
						      LP8755_EVENT_PWR_FAULT,
						      NULL);

	/* 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_notifier_call_chain(pchip->rdev[icnt],
							      LP8755_EVENT_OCP,
							      NULL);

	/* 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_notifier_call_chain(pchip->rdev[icnt],
							      LP8755_EVENT_OVP,
							      NULL);
	return IRQ_HANDLED;

err_i2c:
	dev_err(pchip->dev, "i2c acceess 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)
		goto err_i2c;
	pchip->irqmask = regval;
	ret = request_threaded_irq(pchip->irq, NULL, lp8755_irq_handler,
				   IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
				   "lp8755-irq", pchip);
	if (ret)
		return ret;

	return ret;

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

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 = client->dev.platform_data;

	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_regulator;
	}

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

	return ret;

err_irq:
	for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++)
		regulator_unregister(pchip->rdev[icnt]);

err_regulator:
	/* output disable */
	for (icnt = 0; icnt < 0x06; 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 < mphase_buck[pchip->mphase].nreg; icnt++)
		regulator_unregister(pchip->rdev[icnt]);

	for (icnt = 0; icnt < 0x06; icnt++)
		lp8755_write(pchip, icnt, 0x00);

	if (pchip->irq != 0)
		free_irq(pchip->irq, pchip);

	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 <[email protected]>");
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 <[email protected]>
	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>
	22	#include <linux/delay.h>
	23	#include <linux/uaccess.h>
	24	#include <linux/regulator/driver.h>
	25	#include <linux/regulator/machine.h>
	26	#include <linux/platform_data/lp8755.h>
	27
	28	#define LP8755_REG_BUCK0 0x00
	29	#define LP8755_REG_BUCK1 0x03
	30	#define LP8755_REG_BUCK2 0x04
	31	#define LP8755_REG_BUCK3 0x01
	32	#define LP8755_REG_BUCK4 0x05
	33	#define LP8755_REG_BUCK5 0x02
	34	#define LP8755_REG_MAX 0xFF
	35
	36	#define LP8755_BUCK_EN_M BIT(7)
	37	#define LP8755_BUCK_LINEAR_OUT_MAX 0x76
	38	#define LP8755_BUCK_VOUT_M 0x7F
	39
b59320cc DJ	40	struct lp8755_mphase {
	41	int nreg;
	42	int buck_num[LP8755_BUCK_MAX];
	43	};
	44
	45	struct lp8755_chip {
	46	struct device *dev;
	47	struct regmap *regmap;
	48	struct lp8755_platform_data *pdata;
	49
	50	int irq;
	51	unsigned int irqmask;
	52
	53	int mphase;
	54	struct regulator_dev *rdev[LP8755_BUCK_MAX];
	55	};
	56
	57	/**
	58	*lp8755_read : read a single register value from lp8755.
	59	*@pchip : device to read from
	60	*@reg : register to read from
	61	*@val : pointer to store read value
	62	*/
	63	static int lp8755_read(struct lp8755_chip *pchip, unsigned int reg,
	64	unsigned int *val)
	65	{
	66	return regmap_read(pchip->regmap, reg, val);
	67	}
	68
	69	/**
	70	*lp8755_write : write a single register value to lp8755.
	71	*@pchip : device to write to
	72	*@reg : register to write to
	73	*@val : value to be written
	74	*/
	75	static int lp8755_write(struct lp8755_chip *pchip, unsigned int reg,
	76	unsigned int val)
	77	{
	78	return regmap_write(pchip->regmap, reg, val);
	79	}
	80
	81	/**
	82	*lp8755_update_bits : set the values of bit fields in lp8755 register.
	83	*@pchip : device to read from
	84	*@reg : register to update
	85	*@mask : bitmask to be changed
	86	*@val : value for bitmask
	87	*/
	88	static int lp8755_update_bits(struct lp8755_chip *pchip, unsigned int reg,
	89	unsigned int mask, unsigned int val)
	90	{
	91	return regmap_update_bits(pchip->regmap, reg, mask, val);
	92	}
	93
	94	static int lp8755_buck_enable_time(struct regulator_dev *rdev)
	95	{
	96	int ret;
	97	unsigned int regval;
	98	enum lp8755_bucks id = rdev_get_id(rdev);
	99	struct lp8755_chip *pchip = rdev_get_drvdata(rdev);
	100
	101	ret = lp8755_read(pchip, 0x12 + id, &regval);
	102	if (ret < 0) {
	103	dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
104	return ret;
105	}
106	return (regval & 0xff) * 100;
107	}
108
109	static int lp8755_buck_set_mode(struct regulator_dev *rdev, unsigned int mode)
110	{
111	int ret;
112	unsigned int regbval = 0x0;
113	enum lp8755_bucks id = rdev_get_id(rdev);
114	struct lp8755_chip *pchip = rdev_get_drvdata(rdev);
115
116	switch (mode) {
117	case REGULATOR_MODE_FAST:
118	/* forced pwm mode */
119	regbval = (0x01 << id);
120	break;
121	case REGULATOR_MODE_NORMAL:
122	/* enable automatic pwm/pfm mode */
123	ret = lp8755_update_bits(pchip, 0x08 + id, 0x20, 0x00);
124	if (ret < 0)
125	goto err_i2c;
126	break;
127	case REGULATOR_MODE_IDLE:
128	/* enable automatic pwm/pfm/lppfm mode */
129	ret = lp8755_update_bits(pchip, 0x08 + id, 0x20, 0x20);
130	if (ret < 0)
131	goto err_i2c;
132
133	ret = lp8755_update_bits(pchip, 0x10, 0x01, 0x01);
134	if (ret < 0)
135	goto err_i2c;
136	break;
137	default:
138	dev_err(pchip->dev, "Not supported buck mode %s\n", __func__);
139	/* forced pwm mode */
140	regbval = (0x01 << id);
141	}
142
143	ret = lp8755_update_bits(pchip, 0x06, 0x01 << id, regbval);
144	if (ret < 0)
145	goto err_i2c;
146	return ret;
147	err_i2c:
148	dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
149	return ret;
150	}
151
152	static unsigned int lp8755_buck_get_mode(struct regulator_dev *rdev)
153	{
154	int ret;
155	unsigned int regval;
156	enum lp8755_bucks id = rdev_get_id(rdev);
157	struct lp8755_chip *pchip = rdev_get_drvdata(rdev);
158
159	ret = lp8755_read(pchip, 0x06, &regval);
160	if (ret < 0)
161	goto err_i2c;
162
163	/* mode fast means forced pwm mode */
164	if (regval & (0x01 << id))
165	return REGULATOR_MODE_FAST;
166
167	ret = lp8755_read(pchip, 0x08 + id, &regval);
168	if (ret < 0)
169	goto err_i2c;
170
171	/* mode idle means automatic pwm/pfm/lppfm mode */
172	if (regval & 0x20)
173	return REGULATOR_MODE_IDLE;
174
175	/* mode normal means automatic pwm/pfm mode */
176	return REGULATOR_MODE_NORMAL;
177
178	err_i2c:
179	dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
180	return 0;
181	}
182
183	static int lp8755_buck_set_ramp(struct regulator_dev *rdev, int ramp)
184	{
185	int ret;
186	unsigned int regval = 0x00;
187	enum lp8755_bucks id = rdev_get_id(rdev);
188	struct lp8755_chip *pchip = rdev_get_drvdata(rdev);
189
190	/* uV/us */
191	switch (ramp) {
192	case 0 ... 230:
193	regval = 0x07;
194	break;
195	case 231 ... 470:
196	regval = 0x06;
197	break;
198	case 471 ... 940:
199	regval = 0x05;
200	break;
201	case 941 ... 1900:
202	regval = 0x04;
203	break;
204	case 1901 ... 3800:
205	regval = 0x03;
206	break;
207	case 3801 ... 7500:
208	regval = 0x02;
209	break;
210	case 7501 ... 15000:
211	regval = 0x01;
212	break;
213	case 15001 ... 30000:
214	regval = 0x00;
215	break;
216	default:
217	dev_err(pchip->dev,
218	"Not supported ramp value %d %s\n", ramp, __func__);
219	return -EINVAL;
220	}
221
222	ret = lp8755_update_bits(pchip, 0x07 + id, 0x07, regval);
223	if (ret < 0)
224	goto err_i2c;
225	return ret;
226	err_i2c:
227	dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
228	return ret;
229	}
230
231	static struct regulator_ops lp8755_buck_ops = {
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:
	298	dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
	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] =
	342	regulator_register(&lp8755_regulators[buck_num], &rconfig);
	343	if (IS_ERR(pchip->rdev[buck_num])) {
	344	ret = PTR_ERR(pchip->rdev[buck_num]);
a1a41ab4 AL	345	pchip->rdev[buck_num] = NULL;
	346	dev_err(pchip->dev, "regulator init failed: buck %d\n",
	347	buck_num);
b59320cc DJ	348	goto err_buck;
	349	}
	350	}
	351
	352	return 0;
	353
	354	err_buck:
	355	for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
a1a41ab4	356	regulator_unregister(pchip->rdev[icnt]);
b59320cc DJ	357	return ret;
	358	}
	359
	360	static irqreturn_t lp8755_irq_handler(int irq, void *data)
	361	{
	362	int ret, icnt;
	363	unsigned int flag0, flag1;
	364	struct lp8755_chip *pchip = data;
	365
	366	/* read flag0 register */
	367	ret = lp8755_read(pchip, 0x0D, &flag0);
	368	if (ret < 0)
	369	goto err_i2c;
	370	/* clear flag register to pull up int. pin */
	371	ret = lp8755_write(pchip, 0x0D, 0x00);
	372	if (ret < 0)
	373	goto err_i2c;
	374
	375	/* sent power fault detection event to specific regulator */
	376	for (icnt = 0; icnt < 6; icnt++)
	377	if ((flag0 & (0x4 << icnt))
	378	&& (pchip->irqmask & (0x04 << icnt))
	379	&& (pchip->rdev[icnt] != NULL))
	380	regulator_notifier_call_chain(pchip->rdev[icnt],
	381	LP8755_EVENT_PWR_FAULT,
	382	NULL);
	383
	384	/* read flag1 register */
	385	ret = lp8755_read(pchip, 0x0E, &flag1);
	386	if (ret < 0)
	387	goto err_i2c;
	388	/* clear flag register to pull up int. pin */
	389	ret = lp8755_write(pchip, 0x0E, 0x00);
	390	if (ret < 0)
	391	goto err_i2c;
	392
	393	/* send OCP event to all regualtor devices */
	394	if ((flag1 & 0x01) && (pchip->irqmask & 0x01))
	395	for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
	396	if (pchip->rdev[icnt] != NULL)
	397	regulator_notifier_call_chain(pchip->rdev[icnt],
	398	LP8755_EVENT_OCP,
	399	NULL);
	400
	401	/* send OVP event to all regualtor devices */
	402	if ((flag1 & 0x02) && (pchip->irqmask & 0x02))
	403	for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
	404	if (pchip->rdev[icnt] != NULL)
	405	regulator_notifier_call_chain(pchip->rdev[icnt],
	406	LP8755_EVENT_OVP,
	407	NULL);
	408	return IRQ_HANDLED;
	409
	410	err_i2c:
	411	dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
	412	return IRQ_NONE;
	413	}
	414
	415	static int lp8755_int_config(struct lp8755_chip *pchip)
	416	{
	417	int ret;
	418	unsigned int regval;
	419
	420	if (pchip->irq == 0) {
421	dev_warn(pchip->dev, "not use interrupt : %s\n", __func__);
422	return 0;
423	}
424
425	ret = lp8755_read(pchip, 0x0F, &regval);
426	if (ret < 0)
427	goto err_i2c;
428	pchip->irqmask = regval;
429	ret = request_threaded_irq(pchip->irq, NULL, lp8755_irq_handler,
430	IRQF_TRIGGER_FALLING \| IRQF_ONESHOT,
431	"lp8755-irq", pchip);
432	if (ret)
433	return ret;
434
435	return ret;
436
437	err_i2c:
438	dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
439	return ret;
440	}
441
442	static const struct regmap_config lp8755_regmap = {
443	.reg_bits = 8,
444	.val_bits = 8,
445	.max_register = LP8755_REG_MAX,
446	};
447
448	static int lp8755_probe(struct i2c_client *client,
449	const struct i2c_device_id *id)
450	{
451	int ret, icnt;
452	struct lp8755_chip *pchip;
453	struct lp8755_platform_data *pdata = client->dev.platform_data;
454
455	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
456	dev_err(&client->dev, "i2c functionality check fail.\n");
457	return -EOPNOTSUPP;
458	}
459
460	pchip = devm_kzalloc(&client->dev,
461	sizeof(struct lp8755_chip), GFP_KERNEL);
462	if (!pchip)
463	return -ENOMEM;
464
465	pchip->dev = &client->dev;
466	pchip->regmap = devm_regmap_init_i2c(client, &lp8755_regmap);
467	if (IS_ERR(pchip->regmap)) {
468	ret = PTR_ERR(pchip->regmap);
469	dev_err(&client->dev, "fail to allocate regmap %d\n", ret);
470	return ret;
471	}
472	i2c_set_clientdata(client, pchip);
473
474	if (pdata != NULL) {
475	pchip->pdata = pdata;
476	pchip->mphase = pdata->mphase;
477	} else {
478	pchip->pdata = devm_kzalloc(pchip->dev,
479	sizeof(struct lp8755_platform_data),
480	GFP_KERNEL);
481	if (!pchip->pdata)
482	return -ENOMEM;
483	ret = lp8755_init_data(pchip);
240a5291 AL	484	if (ret < 0) {
	485	dev_err(&client->dev, "fail to initialize chip\n");
	486	return ret;
	487	}
b59320cc DJ	488	}
	489
	490	ret = lp8755_regulator_init(pchip);
240a5291 AL	491	if (ret < 0) {
240a5291 AL	492	dev_err(&client->dev, "fail to initialize regulators\n");
b59320cc	493	goto err_regulator;
240a5291	494	}
b59320cc DJ	495
	496	pchip->irq = client->irq;
	497	ret = lp8755_int_config(pchip);
240a5291 AL	498	if (ret < 0) {
240a5291 AL	499	dev_err(&client->dev, "fail to irq config\n");
b59320cc	500	goto err_irq;
240a5291	501	}
b59320cc DJ	502
	503	return ret;
	504
	505	err_irq:
b59320cc DJ	506	for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++)
	507	regulator_unregister(pchip->rdev[icnt]);
	508
	509	err_regulator:
b59320cc DJ	510	/* output disable */
	511	for (icnt = 0; icnt < 0x06; icnt++)
	512	lp8755_write(pchip, icnt, 0x00);
	513
b59320cc DJ	514	return ret;
	515	}
	516
	517	static int lp8755_remove(struct i2c_client *client)
	518	{
	519	int icnt;
	520	struct lp8755_chip *pchip = i2c_get_clientdata(client);
	521
	522	for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++)
	523	regulator_unregister(pchip->rdev[icnt]);
	524
	525	for (icnt = 0; icnt < 0x06; icnt++)
	526	lp8755_write(pchip, icnt, 0x00);
	527
	528	if (pchip->irq != 0)
	529	free_irq(pchip->irq, pchip);
	530
	531	return 0;
	532	}
	533
	534	static const struct i2c_device_id lp8755_id[] = {
	535	{LP8755_NAME, 0},
	536	{}
	537	};
	538
	539	MODULE_DEVICE_TABLE(i2c, lp8755_id);
	540
	541	static struct i2c_driver lp8755_i2c_driver = {
	542	.driver = {
	543	.name = LP8755_NAME,
	544	},
	545	.probe = lp8755_probe,
a1a41ab4	546	.remove = lp8755_remove,
b59320cc DJ	547	.id_table = lp8755_id,
	548	};
	549
	550	static int __init lp8755_init(void)
	551	{
	552	return i2c_add_driver(&lp8755_i2c_driver);
	553	}
	554
	555	subsys_initcall(lp8755_init);
	556
	557	static void __exit lp8755_exit(void)
	558	{
	559	i2c_del_driver(&lp8755_i2c_driver);
	560	}
	561
	562	module_exit(lp8755_exit);
	563
	564	MODULE_DESCRIPTION("Texas Instruments lp8755 driver");
	565	MODULE_AUTHOR("Daniel Jeong <[email protected]>");
	566	MODULE_LICENSE("GPL v2");