[linux-block.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/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)
{
	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 void 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);
}

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

MODULE_DEVICE_TABLE(i2c, lp8755_id);

static struct i2c_driver lp8755_i2c_driver = {
	.driver = {
		   .name = LP8755_NAME,
		   .probe_type = PROBE_PREFER_ASYNCHRONOUS,
		   },
	.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>
b59320cc	16	#include <linux/regmap.h>
b59320cc DJ	17	#include <linux/uaccess.h>
	18	#include <linux/regulator/driver.h>
	19	#include <linux/regulator/machine.h>
	20	#include <linux/platform_data/lp8755.h>
	21
	22	#define LP8755_REG_BUCK0 0x00
	23	#define LP8755_REG_BUCK1 0x03
	24	#define LP8755_REG_BUCK2 0x04
	25	#define LP8755_REG_BUCK3 0x01
	26	#define LP8755_REG_BUCK4 0x05
	27	#define LP8755_REG_BUCK5 0x02
	28	#define LP8755_REG_MAX 0xFF
	29
	30	#define LP8755_BUCK_EN_M BIT(7)
	31	#define LP8755_BUCK_LINEAR_OUT_MAX 0x76
	32	#define LP8755_BUCK_VOUT_M 0x7F
	33
b59320cc DJ	34	struct lp8755_mphase {
	35	int nreg;
	36	int buck_num[LP8755_BUCK_MAX];
	37	};
	38
	39	struct lp8755_chip {
	40	struct device *dev;
	41	struct regmap *regmap;
	42	struct lp8755_platform_data *pdata;
	43
	44	int irq;
	45	unsigned int irqmask;
	46
	47	int mphase;
	48	struct regulator_dev *rdev[LP8755_BUCK_MAX];
	49	};
	50
b59320cc DJ	51	static int lp8755_buck_enable_time(struct regulator_dev *rdev)
	52	{
	53	int ret;
	54	unsigned int regval;
	55	enum lp8755_bucks id = rdev_get_id(rdev);
b59320cc	56
4cf12735	57	ret = regmap_read(rdev->regmap, 0x12 + id, &regval);
b59320cc	58	if (ret < 0) {
4cf12735	59	dev_err(&rdev->dev, "i2c access error %s\n", __func__);
b59320cc DJ	60	return ret;
	61	}
	62	return (regval & 0xff) * 100;
	63	}
	64
	65	static int lp8755_buck_set_mode(struct regulator_dev *rdev, unsigned int mode)
	66	{
	67	int ret;
	68	unsigned int regbval = 0x0;
	69	enum lp8755_bucks id = rdev_get_id(rdev);
	70	struct lp8755_chip *pchip = rdev_get_drvdata(rdev);
	71
	72	switch (mode) {
	73	case REGULATOR_MODE_FAST:
	74	/* forced pwm mode */
	75	regbval = (0x01 << id);
	76	break;
	77	case REGULATOR_MODE_NORMAL:
	78	/* enable automatic pwm/pfm mode */
4cf12735	79	ret = regmap_update_bits(rdev->regmap, 0x08 + id, 0x20, 0x00);
b59320cc DJ	80	if (ret < 0)
	81	goto err_i2c;
	82	break;
	83	case REGULATOR_MODE_IDLE:
	84	/* enable automatic pwm/pfm/lppfm mode */
4cf12735	85	ret = regmap_update_bits(rdev->regmap, 0x08 + id, 0x20, 0x20);
b59320cc DJ	86	if (ret < 0)
	87	goto err_i2c;
	88
4cf12735	89	ret = regmap_update_bits(rdev->regmap, 0x10, 0x01, 0x01);
b59320cc DJ	90	if (ret < 0)
	91	goto err_i2c;
	92	break;
	93	default:
	94	dev_err(pchip->dev, "Not supported buck mode %s\n", __func__);
	95	/* forced pwm mode */
	96	regbval = (0x01 << id);
	97	}
	98
4cf12735	99	ret = regmap_update_bits(rdev->regmap, 0x06, 0x01 << id, regbval);
b59320cc DJ	100	if (ret < 0)
	101	goto err_i2c;
	102	return ret;
	103	err_i2c:
4cf12735	104	dev_err(&rdev->dev, "i2c access error %s\n", __func__);
b59320cc DJ	105	return ret;
	106	}
	107
	108	static unsigned int lp8755_buck_get_mode(struct regulator_dev *rdev)
	109	{
	110	int ret;
	111	unsigned int regval;
	112	enum lp8755_bucks id = rdev_get_id(rdev);
b59320cc	113
4cf12735	114	ret = regmap_read(rdev->regmap, 0x06, &regval);
b59320cc DJ	115	if (ret < 0)
	116	goto err_i2c;
	117
	118	/* mode fast means forced pwm mode */
	119	if (regval & (0x01 << id))
	120	return REGULATOR_MODE_FAST;
	121
4cf12735	122	ret = regmap_read(rdev->regmap, 0x08 + id, &regval);
b59320cc DJ	123	if (ret < 0)
	124	goto err_i2c;
	125
	126	/* mode idle means automatic pwm/pfm/lppfm mode */
	127	if (regval & 0x20)
	128	return REGULATOR_MODE_IDLE;
	129
	130	/* mode normal means automatic pwm/pfm mode */
	131	return REGULATOR_MODE_NORMAL;
	132
	133	err_i2c:
4cf12735	134	dev_err(&rdev->dev, "i2c access error %s\n", __func__);
b59320cc DJ	135	return 0;
	136	}
	137
fbd168cd AL	138	static const unsigned int lp8755_buck_ramp_table[] = {
	139	30000, 15000, 7500, 3800, 1900, 940, 470, 230
	140	};
b59320cc	141
d42797a4	142	static const struct regulator_ops lp8755_buck_ops = {
56a942e9	143	.map_voltage = regulator_map_voltage_linear,
b59320cc DJ	144	.list_voltage = regulator_list_voltage_linear,
	145	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	146	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	147	.enable = regulator_enable_regmap,
	148	.disable = regulator_disable_regmap,
	149	.is_enabled = regulator_is_enabled_regmap,
	150	.enable_time = lp8755_buck_enable_time,
	151	.set_mode = lp8755_buck_set_mode,
	152	.get_mode = lp8755_buck_get_mode,
fbd168cd	153	.set_ramp_delay = regulator_set_ramp_delay_regmap,
b59320cc DJ	154	};
	155
	156	#define lp8755_rail(_id) "lp8755_buck"#_id
	157	#define lp8755_buck_init(_id)\
	158	{\
	159	.constraints = {\
	160	.name = lp8755_rail(_id),\
	161	.valid_ops_mask = REGULATOR_CHANGE_VOLTAGE,\
	162	.min_uV = 500000,\
	163	.max_uV = 1675000,\
	164	},\
	165	}
	166
	167	static struct regulator_init_data lp8755_reg_default[LP8755_BUCK_MAX] = {
510799ea AL	168	[LP8755_BUCK0] = lp8755_buck_init(0),
	169	[LP8755_BUCK1] = lp8755_buck_init(1),
	170	[LP8755_BUCK2] = lp8755_buck_init(2),
	171	[LP8755_BUCK3] = lp8755_buck_init(3),
	172	[LP8755_BUCK4] = lp8755_buck_init(4),
	173	[LP8755_BUCK5] = lp8755_buck_init(5),
b59320cc DJ	174	};
	175
	176	static const struct lp8755_mphase mphase_buck[MPHASE_CONF_MAX] = {
510799ea AL	177	{ 3, { LP8755_BUCK0, LP8755_BUCK3, LP8755_BUCK5 } },
	178	{ 6, { LP8755_BUCK0, LP8755_BUCK1, LP8755_BUCK2, LP8755_BUCK3,
	179	LP8755_BUCK4, LP8755_BUCK5 } },
	180	{ 5, { LP8755_BUCK0, LP8755_BUCK2, LP8755_BUCK3, LP8755_BUCK4,
	181	LP8755_BUCK5} },
	182	{ 4, { LP8755_BUCK0, LP8755_BUCK3, LP8755_BUCK4, LP8755_BUCK5} },
	183	{ 3, { LP8755_BUCK0, LP8755_BUCK4, LP8755_BUCK5} },
	184	{ 2, { LP8755_BUCK0, LP8755_BUCK5} },
	185	{ 1, { LP8755_BUCK0} },
	186	{ 2, { LP8755_BUCK0, LP8755_BUCK3} },
	187	{ 4, { LP8755_BUCK0, LP8755_BUCK2, LP8755_BUCK3, LP8755_BUCK5} },
b59320cc DJ	188	};
	189
	190	static int lp8755_init_data(struct lp8755_chip *pchip)
	191	{
	192	unsigned int regval;
	193	int ret, icnt, buck_num;
	194	struct lp8755_platform_data *pdata = pchip->pdata;
	195
	196	/* read back muti-phase configuration */
4cf12735	197	ret = regmap_read(pchip->regmap, 0x3D, &regval);
b59320cc DJ	198	if (ret < 0)
b59320cc DJ	199	goto out_i2c_error;
cad877ef	200	pchip->mphase = regval & 0x0F;
b59320cc DJ	201
	202	/* set default data based on multi-phase config */
	203	for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++) {
	204	buck_num = mphase_buck[pchip->mphase].buck_num[icnt];
	205	pdata->buck_data[buck_num] = &lp8755_reg_default[buck_num];
	206	}
	207	return ret;
	208
	209	out_i2c_error:
80aec6f5	210	dev_err(pchip->dev, "i2c access error %s\n", __func__);
b59320cc DJ	211	return ret;
	212	}
	213
	214	#define lp8755_buck_desc(_id)\
	215	{\
	216	.name = lp8755_rail(_id),\
	217	.id = LP8755_BUCK##_id,\
	218	.ops = &lp8755_buck_ops,\
	219	.n_voltages = LP8755_BUCK_LINEAR_OUT_MAX+1,\
	220	.uV_step = 10000,\
	221	.min_uV = 500000,\
	222	.type = REGULATOR_VOLTAGE,\
	223	.owner = THIS_MODULE,\
	224	.enable_reg = LP8755_REG_BUCK##_id,\
	225	.enable_mask = LP8755_BUCK_EN_M,\
	226	.vsel_reg = LP8755_REG_BUCK##_id,\
	227	.vsel_mask = LP8755_BUCK_VOUT_M,\
fbd168cd AL	228	.ramp_reg = (LP8755_BUCK##_id) + 0x7,\
	229	.ramp_mask = 0x7,\
	230	.ramp_delay_table = lp8755_buck_ramp_table,\
	231	.n_ramp_values = ARRAY_SIZE(lp8755_buck_ramp_table),\
b59320cc DJ	232	}
b59320cc DJ	233
367e90d1	234	static const struct regulator_desc lp8755_regulators[] = {
b59320cc DJ	235	lp8755_buck_desc(0),
	236	lp8755_buck_desc(1),
	237	lp8755_buck_desc(2),
	238	lp8755_buck_desc(3),
	239	lp8755_buck_desc(4),
	240	lp8755_buck_desc(5),
	241	};
	242
	243	static int lp8755_regulator_init(struct lp8755_chip *pchip)
	244	{
	245	int ret, icnt, buck_num;
	246	struct lp8755_platform_data *pdata = pchip->pdata;
	247	struct regulator_config rconfig = { };
	248
	249	rconfig.regmap = pchip->regmap;
	250	rconfig.dev = pchip->dev;
	251	rconfig.driver_data = pchip;
	252
	253	for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++) {
	254	buck_num = mphase_buck[pchip->mphase].buck_num[icnt];
	255	rconfig.init_data = pdata->buck_data[buck_num];
	256	rconfig.of_node = pchip->dev->of_node;
	257	pchip->rdev[buck_num] =
57135250 HS	258	devm_regulator_register(pchip->dev,
57135250 HS	259	&lp8755_regulators[buck_num], &rconfig);
b59320cc DJ	260	if (IS_ERR(pchip->rdev[buck_num])) {
b59320cc DJ	261	ret = PTR_ERR(pchip->rdev[buck_num]);
a1a41ab4 AL	262	pchip->rdev[buck_num] = NULL;
	263	dev_err(pchip->dev, "regulator init failed: buck %d\n",
	264	buck_num);
57135250	265	return ret;
b59320cc DJ	266	}
	267	}
	268
	269	return 0;
b59320cc DJ	270	}
	271
	272	static irqreturn_t lp8755_irq_handler(int irq, void *data)
	273	{
	274	int ret, icnt;
	275	unsigned int flag0, flag1;
	276	struct lp8755_chip *pchip = data;
	277
	278	/* read flag0 register */
4cf12735	279	ret = regmap_read(pchip->regmap, 0x0D, &flag0);
b59320cc DJ	280	if (ret < 0)
	281	goto err_i2c;
	282	/* clear flag register to pull up int. pin */
4cf12735	283	ret = regmap_write(pchip->regmap, 0x0D, 0x00);
b59320cc DJ	284	if (ret < 0)
	285	goto err_i2c;
	286
	287	/* sent power fault detection event to specific regulator */
1200c60b	288	for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
b59320cc DJ	289	if ((flag0 & (0x4 << icnt))
b59320cc DJ	290	&& (pchip->irqmask & (0x04 << icnt))
89b2758c	291	&& (pchip->rdev[icnt] != NULL)) {
b59320cc DJ	292	regulator_notifier_call_chain(pchip->rdev[icnt],
	293	LP8755_EVENT_PWR_FAULT,
	294	NULL);
89b2758c	295	}
b59320cc DJ	296
b59320cc DJ	297	/* read flag1 register */
4cf12735	298	ret = regmap_read(pchip->regmap, 0x0E, &flag1);
b59320cc DJ	299	if (ret < 0)
	300	goto err_i2c;
	301	/* clear flag register to pull up int. pin */
4cf12735	302	ret = regmap_write(pchip->regmap, 0x0E, 0x00);
b59320cc DJ	303	if (ret < 0)
	304	goto err_i2c;
	305
48f1b4ef	306	/* send OCP event to all regulator devices */
b59320cc DJ	307	if ((flag1 & 0x01) && (pchip->irqmask & 0x01))
b59320cc DJ	308	for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
89b2758c	309	if (pchip->rdev[icnt] != NULL) {
b59320cc DJ	310	regulator_notifier_call_chain(pchip->rdev[icnt],
	311	LP8755_EVENT_OCP,
	312	NULL);
89b2758c	313	}
b59320cc	314
48f1b4ef	315	/* send OVP event to all regulator devices */
b59320cc DJ	316	if ((flag1 & 0x02) && (pchip->irqmask & 0x02))
b59320cc DJ	317	for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
89b2758c	318	if (pchip->rdev[icnt] != NULL) {
b59320cc DJ	319	regulator_notifier_call_chain(pchip->rdev[icnt],
	320	LP8755_EVENT_OVP,
	321	NULL);
89b2758c	322	}
b59320cc DJ	323	return IRQ_HANDLED;
	324
	325	err_i2c:
80aec6f5	326	dev_err(pchip->dev, "i2c access error %s\n", __func__);
b59320cc DJ	327	return IRQ_NONE;
	328	}
	329
	330	static int lp8755_int_config(struct lp8755_chip *pchip)
	331	{
	332	int ret;
	333	unsigned int regval;
	334
	335	if (pchip->irq == 0) {
	336	dev_warn(pchip->dev, "not use interrupt : %s\n", __func__);
	337	return 0;
	338	}
	339
4cf12735	340	ret = regmap_read(pchip->regmap, 0x0F, &regval);
840499aa	341	if (ret < 0) {
80aec6f5	342	dev_err(pchip->dev, "i2c access error %s\n", __func__);
b59320cc	343	return ret;
840499aa	344	}
b59320cc	345
840499aa AL	346	pchip->irqmask = regval;
	347	return devm_request_threaded_irq(pchip->dev, pchip->irq, NULL,
	348	lp8755_irq_handler,
	349	IRQF_TRIGGER_FALLING \| IRQF_ONESHOT,
	350	"lp8755-irq", pchip);
b59320cc DJ	351	}
	352
	353	static const struct regmap_config lp8755_regmap = {
	354	.reg_bits = 8,
	355	.val_bits = 8,
	356	.max_register = LP8755_REG_MAX,
	357	};
	358
cb28f74b	359	static int lp8755_probe(struct i2c_client *client)
b59320cc DJ	360	{
	361	int ret, icnt;
	362	struct lp8755_chip *pchip;
dff91d0b	363	struct lp8755_platform_data *pdata = dev_get_platdata(&client->dev);
b59320cc DJ	364
	365	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
	366	dev_err(&client->dev, "i2c functionality check fail.\n");
	367	return -EOPNOTSUPP;
	368	}
	369
	370	pchip = devm_kzalloc(&client->dev,
	371	sizeof(struct lp8755_chip), GFP_KERNEL);
	372	if (!pchip)
	373	return -ENOMEM;
	374
	375	pchip->dev = &client->dev;
	376	pchip->regmap = devm_regmap_init_i2c(client, &lp8755_regmap);
	377	if (IS_ERR(pchip->regmap)) {
	378	ret = PTR_ERR(pchip->regmap);
	379	dev_err(&client->dev, "fail to allocate regmap %d\n", ret);
	380	return ret;
	381	}
	382	i2c_set_clientdata(client, pchip);
	383
	384	if (pdata != NULL) {
	385	pchip->pdata = pdata;
	386	pchip->mphase = pdata->mphase;
	387	} else {
	388	pchip->pdata = devm_kzalloc(pchip->dev,
	389	sizeof(struct lp8755_platform_data),
	390	GFP_KERNEL);
	391	if (!pchip->pdata)
	392	return -ENOMEM;
	393	ret = lp8755_init_data(pchip);
240a5291 AL	394	if (ret < 0) {
	395	dev_err(&client->dev, "fail to initialize chip\n");
	396	return ret;
	397	}
b59320cc DJ	398	}
	399
	400	ret = lp8755_regulator_init(pchip);
240a5291 AL	401	if (ret < 0) {
240a5291 AL	402	dev_err(&client->dev, "fail to initialize regulators\n");
57135250	403	goto err;
240a5291	404	}
b59320cc DJ	405
	406	pchip->irq = client->irq;
	407	ret = lp8755_int_config(pchip);
240a5291 AL	408	if (ret < 0) {
240a5291 AL	409	dev_err(&client->dev, "fail to irq config\n");
57135250	410	goto err;
240a5291	411	}
b59320cc DJ	412
	413	return ret;
	414
57135250	415	err:
b59320cc	416	/* output disable */
1200c60b	417	for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
4cf12735	418	regmap_write(pchip->regmap, icnt, 0x00);
b59320cc	419
b59320cc DJ	420	return ret;
	421	}
	422
ed5c2f5f	423	static void lp8755_remove(struct i2c_client *client)
b59320cc DJ	424	{
	425	int icnt;
	426	struct lp8755_chip *pchip = i2c_get_clientdata(client);
	427
1200c60b	428	for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
4cf12735	429	regmap_write(pchip->regmap, icnt, 0x00);
b59320cc DJ	430	}
	431
	432	static const struct i2c_device_id lp8755_id[] = {
aea07a98	433	{ LP8755_NAME },
b59320cc DJ	434	{}
	435	};
	436
	437	MODULE_DEVICE_TABLE(i2c, lp8755_id);
	438
	439	static struct i2c_driver lp8755_i2c_driver = {
	440	.driver = {
	441	.name = LP8755_NAME,
259b93b2	442	.probe_type = PROBE_PREFER_ASYNCHRONOUS,
b59320cc	443	},
964e1865	444	.probe = lp8755_probe,
a1a41ab4	445	.remove = lp8755_remove,
b59320cc DJ	446	.id_table = lp8755_id,
	447	};
	448
	449	static int __init lp8755_init(void)
	450	{
	451	return i2c_add_driver(&lp8755_i2c_driver);
	452	}
	453
	454	subsys_initcall(lp8755_init);
	455
	456	static void __exit lp8755_exit(void)
	457	{
	458	i2c_del_driver(&lp8755_i2c_driver);
	459	}
	460
	461	module_exit(lp8755_exit);
	462
	463	MODULE_DESCRIPTION("Texas Instruments lp8755 driver");
	464	MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>");
	465	MODULE_LICENSE("GPL v2");