[mirror_ubuntu-jammy-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];
};

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

	ret = regmap_read(rdev->regmap, 0x12 + id, &regval);
	if (ret < 0) {
		dev_err(&rdev->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 = regmap_update_bits(rdev->regmap, 0x08 + id, 0x20, 0x00);
		if (ret < 0)
			goto err_i2c;
		break;
	case REGULATOR_MODE_IDLE:
		/* enable automatic pwm/pfm/lppfm mode */
		ret = regmap_update_bits(rdev->regmap, 0x08 + id, 0x20, 0x20);
		if (ret < 0)
			goto err_i2c;

		ret = regmap_update_bits(rdev->regmap, 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 = regmap_update_bits(rdev->regmap, 0x06, 0x01 << id, regbval);
	if (ret < 0)
		goto err_i2c;
	return ret;
err_i2c:
	dev_err(&rdev->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);

	ret = regmap_read(rdev->regmap, 0x06, &regval);
	if (ret < 0)
		goto err_i2c;

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

	ret = regmap_read(rdev->regmap, 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(&rdev->dev, "i2c access error %s\n", __func__);
	return 0;
}

static const unsigned int lp8755_buck_ramp_table[] = {
	30000, 15000, 7500, 3800, 1900, 940, 470, 230
};

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 = regulator_set_ramp_delay_regmap,
};

#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 = regmap_read(pchip->regmap, 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,\
	.ramp_reg = (LP8755_BUCK##_id) + 0x7,\
	.ramp_mask = 0x7,\
	.ramp_delay_table = lp8755_buck_ramp_table,\
	.n_ramp_values = ARRAY_SIZE(lp8755_buck_ramp_table),\
}

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 = regmap_read(pchip->regmap, 0x0D, &flag0);
	if (ret < 0)
		goto err_i2c;
	/* clear flag register to pull up int. pin */
	ret = regmap_write(pchip->regmap, 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_notifier_call_chain(pchip->rdev[icnt],
						      LP8755_EVENT_PWR_FAULT,
						      NULL);
		}

	/* read flag1 register */
	ret = regmap_read(pchip->regmap, 0x0E, &flag1);
	if (ret < 0)
		goto err_i2c;
	/* clear flag register to pull up int. pin */
	ret = regmap_write(pchip->regmap, 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_notifier_call_chain(pchip->rdev[icnt],
							      LP8755_EVENT_OCP,
							      NULL);
			}

	/* 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_notifier_call_chain(pchip->rdev[icnt],
							      LP8755_EVENT_OVP,
							      NULL);
			}
	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 = regmap_read(pchip->regmap, 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++)
		regmap_write(pchip->regmap, 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++)
		regmap_write(pchip->regmap, 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
b59320cc DJ	52	static int lp8755_buck_enable_time(struct regulator_dev *rdev)
	53	{
	54	int ret;
	55	unsigned int regval;
	56	enum lp8755_bucks id = rdev_get_id(rdev);
b59320cc	57
4cf12735	58	ret = regmap_read(rdev->regmap, 0x12 + id, &regval);
b59320cc	59	if (ret < 0) {
4cf12735	60	dev_err(&rdev->dev, "i2c access error %s\n", __func__);
b59320cc DJ	61	return ret;
	62	}
	63	return (regval & 0xff) * 100;
	64	}
	65
	66	static int lp8755_buck_set_mode(struct regulator_dev *rdev, unsigned int mode)
	67	{
	68	int ret;
	69	unsigned int regbval = 0x0;
	70	enum lp8755_bucks id = rdev_get_id(rdev);
	71	struct lp8755_chip *pchip = rdev_get_drvdata(rdev);
	72
	73	switch (mode) {
	74	case REGULATOR_MODE_FAST:
	75	/* forced pwm mode */
	76	regbval = (0x01 << id);
	77	break;
	78	case REGULATOR_MODE_NORMAL:
	79	/* enable automatic pwm/pfm mode */
4cf12735	80	ret = regmap_update_bits(rdev->regmap, 0x08 + id, 0x20, 0x00);
b59320cc DJ	81	if (ret < 0)
	82	goto err_i2c;
	83	break;
	84	case REGULATOR_MODE_IDLE:
	85	/* enable automatic pwm/pfm/lppfm mode */
4cf12735	86	ret = regmap_update_bits(rdev->regmap, 0x08 + id, 0x20, 0x20);
b59320cc DJ	87	if (ret < 0)
	88	goto err_i2c;
	89
4cf12735	90	ret = regmap_update_bits(rdev->regmap, 0x10, 0x01, 0x01);
b59320cc DJ	91	if (ret < 0)
	92	goto err_i2c;
	93	break;
	94	default:
	95	dev_err(pchip->dev, "Not supported buck mode %s\n", __func__);
	96	/* forced pwm mode */
	97	regbval = (0x01 << id);
	98	}
	99
4cf12735	100	ret = regmap_update_bits(rdev->regmap, 0x06, 0x01 << id, regbval);
b59320cc DJ	101	if (ret < 0)
	102	goto err_i2c;
	103	return ret;
	104	err_i2c:
4cf12735	105	dev_err(&rdev->dev, "i2c access error %s\n", __func__);
b59320cc DJ	106	return ret;
	107	}
	108
	109	static unsigned int lp8755_buck_get_mode(struct regulator_dev *rdev)
	110	{
	111	int ret;
	112	unsigned int regval;
	113	enum lp8755_bucks id = rdev_get_id(rdev);
b59320cc	114
4cf12735	115	ret = regmap_read(rdev->regmap, 0x06, &regval);
b59320cc DJ	116	if (ret < 0)
	117	goto err_i2c;
	118
	119	/* mode fast means forced pwm mode */
	120	if (regval & (0x01 << id))
	121	return REGULATOR_MODE_FAST;
	122
4cf12735	123	ret = regmap_read(rdev->regmap, 0x08 + id, &regval);
b59320cc DJ	124	if (ret < 0)
	125	goto err_i2c;
	126
	127	/* mode idle means automatic pwm/pfm/lppfm mode */
	128	if (regval & 0x20)
	129	return REGULATOR_MODE_IDLE;
	130
	131	/* mode normal means automatic pwm/pfm mode */
	132	return REGULATOR_MODE_NORMAL;
	133
	134	err_i2c:
4cf12735	135	dev_err(&rdev->dev, "i2c access error %s\n", __func__);
b59320cc DJ	136	return 0;
	137	}
	138
fbd168cd AL	139	static const unsigned int lp8755_buck_ramp_table[] = {
	140	30000, 15000, 7500, 3800, 1900, 940, 470, 230
	141	};
b59320cc	142
d42797a4	143	static const struct regulator_ops lp8755_buck_ops = {
56a942e9	144	.map_voltage = regulator_map_voltage_linear,
b59320cc DJ	145	.list_voltage = regulator_list_voltage_linear,
	146	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	147	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	148	.enable = regulator_enable_regmap,
	149	.disable = regulator_disable_regmap,
	150	.is_enabled = regulator_is_enabled_regmap,
	151	.enable_time = lp8755_buck_enable_time,
	152	.set_mode = lp8755_buck_set_mode,
	153	.get_mode = lp8755_buck_get_mode,
fbd168cd	154	.set_ramp_delay = regulator_set_ramp_delay_regmap,
b59320cc DJ	155	};
	156
	157	#define lp8755_rail(_id) "lp8755_buck"#_id
	158	#define lp8755_buck_init(_id)\
	159	{\
	160	.constraints = {\
	161	.name = lp8755_rail(_id),\
	162	.valid_ops_mask = REGULATOR_CHANGE_VOLTAGE,\
	163	.min_uV = 500000,\
	164	.max_uV = 1675000,\
	165	},\
	166	}
	167
	168	static struct regulator_init_data lp8755_reg_default[LP8755_BUCK_MAX] = {
510799ea AL	169	[LP8755_BUCK0] = lp8755_buck_init(0),
	170	[LP8755_BUCK1] = lp8755_buck_init(1),
	171	[LP8755_BUCK2] = lp8755_buck_init(2),
	172	[LP8755_BUCK3] = lp8755_buck_init(3),
	173	[LP8755_BUCK4] = lp8755_buck_init(4),
	174	[LP8755_BUCK5] = lp8755_buck_init(5),
b59320cc DJ	175	};
	176
	177	static const struct lp8755_mphase mphase_buck[MPHASE_CONF_MAX] = {
510799ea AL	178	{ 3, { LP8755_BUCK0, LP8755_BUCK3, LP8755_BUCK5 } },
	179	{ 6, { LP8755_BUCK0, LP8755_BUCK1, LP8755_BUCK2, LP8755_BUCK3,
	180	LP8755_BUCK4, LP8755_BUCK5 } },
	181	{ 5, { LP8755_BUCK0, LP8755_BUCK2, LP8755_BUCK3, LP8755_BUCK4,
	182	LP8755_BUCK5} },
	183	{ 4, { LP8755_BUCK0, LP8755_BUCK3, LP8755_BUCK4, LP8755_BUCK5} },
	184	{ 3, { LP8755_BUCK0, LP8755_BUCK4, LP8755_BUCK5} },
	185	{ 2, { LP8755_BUCK0, LP8755_BUCK5} },
	186	{ 1, { LP8755_BUCK0} },
	187	{ 2, { LP8755_BUCK0, LP8755_BUCK3} },
	188	{ 4, { LP8755_BUCK0, LP8755_BUCK2, LP8755_BUCK3, LP8755_BUCK5} },
b59320cc DJ	189	};
	190
	191	static int lp8755_init_data(struct lp8755_chip *pchip)
	192	{
	193	unsigned int regval;
	194	int ret, icnt, buck_num;
	195	struct lp8755_platform_data *pdata = pchip->pdata;
	196
	197	/* read back muti-phase configuration */
4cf12735	198	ret = regmap_read(pchip->regmap, 0x3D, &regval);
b59320cc DJ	199	if (ret < 0)
b59320cc DJ	200	goto out_i2c_error;
cad877ef	201	pchip->mphase = regval & 0x0F;
b59320cc DJ	202
	203	/* set default data based on multi-phase config */
	204	for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++) {
	205	buck_num = mphase_buck[pchip->mphase].buck_num[icnt];
	206	pdata->buck_data[buck_num] = &lp8755_reg_default[buck_num];
	207	}
	208	return ret;
	209
	210	out_i2c_error:
80aec6f5	211	dev_err(pchip->dev, "i2c access error %s\n", __func__);
b59320cc DJ	212	return ret;
	213	}
	214
	215	#define lp8755_buck_desc(_id)\
	216	{\
	217	.name = lp8755_rail(_id),\
	218	.id = LP8755_BUCK##_id,\
	219	.ops = &lp8755_buck_ops,\
	220	.n_voltages = LP8755_BUCK_LINEAR_OUT_MAX+1,\
	221	.uV_step = 10000,\
	222	.min_uV = 500000,\
	223	.type = REGULATOR_VOLTAGE,\
	224	.owner = THIS_MODULE,\
	225	.enable_reg = LP8755_REG_BUCK##_id,\
	226	.enable_mask = LP8755_BUCK_EN_M,\
	227	.vsel_reg = LP8755_REG_BUCK##_id,\
	228	.vsel_mask = LP8755_BUCK_VOUT_M,\
fbd168cd AL	229	.ramp_reg = (LP8755_BUCK##_id) + 0x7,\
	230	.ramp_mask = 0x7,\
	231	.ramp_delay_table = lp8755_buck_ramp_table,\
	232	.n_ramp_values = ARRAY_SIZE(lp8755_buck_ramp_table),\
b59320cc DJ	233	}
b59320cc DJ	234
367e90d1	235	static const struct regulator_desc lp8755_regulators[] = {
b59320cc DJ	236	lp8755_buck_desc(0),
	237	lp8755_buck_desc(1),
	238	lp8755_buck_desc(2),
	239	lp8755_buck_desc(3),
	240	lp8755_buck_desc(4),
	241	lp8755_buck_desc(5),
	242	};
	243
	244	static int lp8755_regulator_init(struct lp8755_chip *pchip)
	245	{
	246	int ret, icnt, buck_num;
	247	struct lp8755_platform_data *pdata = pchip->pdata;
	248	struct regulator_config rconfig = { };
	249
	250	rconfig.regmap = pchip->regmap;
	251	rconfig.dev = pchip->dev;
	252	rconfig.driver_data = pchip;
	253
	254	for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++) {
	255	buck_num = mphase_buck[pchip->mphase].buck_num[icnt];
	256	rconfig.init_data = pdata->buck_data[buck_num];
	257	rconfig.of_node = pchip->dev->of_node;
	258	pchip->rdev[buck_num] =
57135250 HS	259	devm_regulator_register(pchip->dev,
57135250 HS	260	&lp8755_regulators[buck_num], &rconfig);
b59320cc DJ	261	if (IS_ERR(pchip->rdev[buck_num])) {
b59320cc DJ	262	ret = PTR_ERR(pchip->rdev[buck_num]);
a1a41ab4 AL	263	pchip->rdev[buck_num] = NULL;
	264	dev_err(pchip->dev, "regulator init failed: buck %d\n",
	265	buck_num);
57135250	266	return ret;
b59320cc DJ	267	}
	268	}
	269
	270	return 0;
b59320cc DJ	271	}
	272
	273	static irqreturn_t lp8755_irq_handler(int irq, void *data)
	274	{
	275	int ret, icnt;
	276	unsigned int flag0, flag1;
	277	struct lp8755_chip *pchip = data;
	278
	279	/* read flag0 register */
4cf12735	280	ret = regmap_read(pchip->regmap, 0x0D, &flag0);
b59320cc DJ	281	if (ret < 0)
	282	goto err_i2c;
	283	/* clear flag register to pull up int. pin */
4cf12735	284	ret = regmap_write(pchip->regmap, 0x0D, 0x00);
b59320cc DJ	285	if (ret < 0)
	286	goto err_i2c;
	287
	288	/* sent power fault detection event to specific regulator */
1200c60b	289	for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
b59320cc DJ	290	if ((flag0 & (0x4 << icnt))
b59320cc DJ	291	&& (pchip->irqmask & (0x04 << icnt))
89b2758c	292	&& (pchip->rdev[icnt] != NULL)) {
b59320cc DJ	293	regulator_notifier_call_chain(pchip->rdev[icnt],
	294	LP8755_EVENT_PWR_FAULT,
	295	NULL);
89b2758c	296	}
b59320cc DJ	297
b59320cc DJ	298	/* read flag1 register */
4cf12735	299	ret = regmap_read(pchip->regmap, 0x0E, &flag1);
b59320cc DJ	300	if (ret < 0)
	301	goto err_i2c;
	302	/* clear flag register to pull up int. pin */
4cf12735	303	ret = regmap_write(pchip->regmap, 0x0E, 0x00);
b59320cc DJ	304	if (ret < 0)
	305	goto err_i2c;
	306
48f1b4ef	307	/* send OCP event to all regulator devices */
b59320cc DJ	308	if ((flag1 & 0x01) && (pchip->irqmask & 0x01))
b59320cc DJ	309	for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
89b2758c	310	if (pchip->rdev[icnt] != NULL) {
b59320cc DJ	311	regulator_notifier_call_chain(pchip->rdev[icnt],
	312	LP8755_EVENT_OCP,
	313	NULL);
89b2758c	314	}
b59320cc	315
48f1b4ef	316	/* send OVP event to all regulator devices */
b59320cc DJ	317	if ((flag1 & 0x02) && (pchip->irqmask & 0x02))
b59320cc DJ	318	for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
89b2758c	319	if (pchip->rdev[icnt] != NULL) {
b59320cc DJ	320	regulator_notifier_call_chain(pchip->rdev[icnt],
	321	LP8755_EVENT_OVP,
	322	NULL);
89b2758c	323	}
b59320cc DJ	324	return IRQ_HANDLED;
	325
	326	err_i2c:
80aec6f5	327	dev_err(pchip->dev, "i2c access error %s\n", __func__);
b59320cc DJ	328	return IRQ_NONE;
	329	}
	330
	331	static int lp8755_int_config(struct lp8755_chip *pchip)
	332	{
	333	int ret;
	334	unsigned int regval;
	335
	336	if (pchip->irq == 0) {
	337	dev_warn(pchip->dev, "not use interrupt : %s\n", __func__);
	338	return 0;
	339	}
	340
4cf12735	341	ret = regmap_read(pchip->regmap, 0x0F, &regval);
840499aa	342	if (ret < 0) {
80aec6f5	343	dev_err(pchip->dev, "i2c access error %s\n", __func__);
b59320cc	344	return ret;
840499aa	345	}
b59320cc	346
840499aa AL	347	pchip->irqmask = regval;
	348	return devm_request_threaded_irq(pchip->dev, pchip->irq, NULL,
	349	lp8755_irq_handler,
	350	IRQF_TRIGGER_FALLING \| IRQF_ONESHOT,
	351	"lp8755-irq", pchip);
b59320cc DJ	352	}
	353
	354	static const struct regmap_config lp8755_regmap = {
	355	.reg_bits = 8,
	356	.val_bits = 8,
	357	.max_register = LP8755_REG_MAX,
	358	};
	359
	360	static int lp8755_probe(struct i2c_client *client,
	361	const struct i2c_device_id *id)
	362	{
	363	int ret, icnt;
	364	struct lp8755_chip *pchip;
dff91d0b	365	struct lp8755_platform_data *pdata = dev_get_platdata(&client->dev);
b59320cc DJ	366
	367	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
	368	dev_err(&client->dev, "i2c functionality check fail.\n");
	369	return -EOPNOTSUPP;
	370	}
	371
	372	pchip = devm_kzalloc(&client->dev,
	373	sizeof(struct lp8755_chip), GFP_KERNEL);
	374	if (!pchip)
	375	return -ENOMEM;
	376
	377	pchip->dev = &client->dev;
	378	pchip->regmap = devm_regmap_init_i2c(client, &lp8755_regmap);
	379	if (IS_ERR(pchip->regmap)) {
	380	ret = PTR_ERR(pchip->regmap);
	381	dev_err(&client->dev, "fail to allocate regmap %d\n", ret);
	382	return ret;
	383	}
	384	i2c_set_clientdata(client, pchip);
	385
	386	if (pdata != NULL) {
	387	pchip->pdata = pdata;
	388	pchip->mphase = pdata->mphase;
	389	} else {
	390	pchip->pdata = devm_kzalloc(pchip->dev,
	391	sizeof(struct lp8755_platform_data),
	392	GFP_KERNEL);
	393	if (!pchip->pdata)
	394	return -ENOMEM;
	395	ret = lp8755_init_data(pchip);
240a5291 AL	396	if (ret < 0) {
	397	dev_err(&client->dev, "fail to initialize chip\n");
	398	return ret;
	399	}
b59320cc DJ	400	}
	401
	402	ret = lp8755_regulator_init(pchip);
240a5291 AL	403	if (ret < 0) {
240a5291 AL	404	dev_err(&client->dev, "fail to initialize regulators\n");
57135250	405	goto err;
240a5291	406	}
b59320cc DJ	407
	408	pchip->irq = client->irq;
	409	ret = lp8755_int_config(pchip);
240a5291 AL	410	if (ret < 0) {
240a5291 AL	411	dev_err(&client->dev, "fail to irq config\n");
57135250	412	goto err;
240a5291	413	}
b59320cc DJ	414
	415	return ret;
	416
57135250	417	err:
b59320cc	418	/* output disable */
1200c60b	419	for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
4cf12735	420	regmap_write(pchip->regmap, icnt, 0x00);
b59320cc	421
b59320cc DJ	422	return ret;
	423	}
	424
	425	static int lp8755_remove(struct i2c_client *client)
	426	{
	427	int icnt;
	428	struct lp8755_chip *pchip = i2c_get_clientdata(client);
	429
1200c60b	430	for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
4cf12735	431	regmap_write(pchip->regmap, icnt, 0x00);
b59320cc	432
b59320cc DJ	433	return 0;
	434	}
	435
	436	static const struct i2c_device_id lp8755_id[] = {
	437	{LP8755_NAME, 0},
	438	{}
	439	};
	440
	441	MODULE_DEVICE_TABLE(i2c, lp8755_id);
	442
	443	static struct i2c_driver lp8755_i2c_driver = {
	444	.driver = {
	445	.name = LP8755_NAME,
	446	},
	447	.probe = lp8755_probe,
a1a41ab4	448	.remove = lp8755_remove,
b59320cc DJ	449	.id_table = lp8755_id,
	450	};
	451
	452	static int __init lp8755_init(void)
	453	{
	454	return i2c_add_driver(&lp8755_i2c_driver);
	455	}
	456
	457	subsys_initcall(lp8755_init);
	458
	459	static void __exit lp8755_exit(void)
	460	{
	461	i2c_del_driver(&lp8755_i2c_driver);
	462	}
	463
	464	module_exit(lp8755_exit);
	465
	466	MODULE_DESCRIPTION("Texas Instruments lp8755 driver");
	467	MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>");
	468	MODULE_LICENSE("GPL v2");