[mirror_ubuntu-zesty-kernel.git] / drivers / regulator / fan53555.c

/*
 * FAN53555 Fairchild Digitally Programmable TinyBuck Regulator Driver.
 *
 * Supported Part Numbers:
 * FAN53555UC00X/01X/03X/04X/05X
 *
 * Copyright (c) 2012 Marvell Technology Ltd.
 * Yunfan Zhang <yfzhang@marvell.com>
 *
 * This package 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/param.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/of_regulator.h>
#include <linux/of_device.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/regmap.h>
#include <linux/regulator/fan53555.h>

/* Voltage setting */
#define FAN53555_VSEL0		0x00
#define FAN53555_VSEL1		0x01
/* Control register */
#define FAN53555_CONTROL	0x02
/* IC Type */
#define FAN53555_ID1		0x03
/* IC mask version */
#define FAN53555_ID2		0x04
/* Monitor register */
#define FAN53555_MONITOR	0x05

/* VSEL bit definitions */
#define VSEL_BUCK_EN	(1 << 7)
#define VSEL_MODE		(1 << 6)
#define VSEL_NSEL_MASK	0x3F
/* Chip ID and Verison */
#define DIE_ID		0x0F	/* ID1 */
#define DIE_REV		0x0F	/* ID2 */
/* Control bit definitions */
#define CTL_OUTPUT_DISCHG	(1 << 7)
#define CTL_SLEW_MASK		(0x7 << 4)
#define CTL_SLEW_SHIFT		4
#define CTL_RESET			(1 << 2)

#define FAN53555_NVOLTAGES	64	/* Numbers of voltages */

enum fan53555_vendor {
	FAN53555_VENDOR_FAIRCHILD = 0,
	FAN53555_VENDOR_SILERGY,
};

/* IC Type */
enum {
	FAN53555_CHIP_ID_00 = 0,
	FAN53555_CHIP_ID_01,
	FAN53555_CHIP_ID_02,
	FAN53555_CHIP_ID_03,
	FAN53555_CHIP_ID_04,
	FAN53555_CHIP_ID_05,
	FAN53555_CHIP_ID_08 = 8,
};

/* IC mask revision */
enum {
	FAN53555_CHIP_REV_00 = 0x3,
	FAN53555_CHIP_REV_13 = 0xf,
};

enum {
	SILERGY_SYR82X = 8,
};

struct fan53555_device_info {
	enum fan53555_vendor vendor;
	struct regmap *regmap;
	struct device *dev;
	struct regulator_desc desc;
	struct regulator_dev *rdev;
	struct regulator_init_data *regulator;
	/* IC Type and Rev */
	int chip_id;
	int chip_rev;
	/* Voltage setting register */
	unsigned int vol_reg;
	unsigned int sleep_reg;
	/* Voltage range and step(linear) */
	unsigned int vsel_min;
	unsigned int vsel_step;
	/* Voltage slew rate limiting */
	unsigned int slew_rate;
	/* Sleep voltage cache */
	unsigned int sleep_vol_cache;
};

static int fan53555_set_suspend_voltage(struct regulator_dev *rdev, int uV)
{
	struct fan53555_device_info *di = rdev_get_drvdata(rdev);
	int ret;

	if (di->sleep_vol_cache == uV)
		return 0;
	ret = regulator_map_voltage_linear(rdev, uV, uV);
	if (ret < 0)
		return ret;
	ret = regmap_update_bits(di->regmap, di->sleep_reg,
					VSEL_NSEL_MASK, ret);
	if (ret < 0)
		return ret;
	/* Cache the sleep voltage setting.
	 * Might not be the real voltage which is rounded */
	di->sleep_vol_cache = uV;

	return 0;
}

static int fan53555_set_suspend_enable(struct regulator_dev *rdev)
{
	struct fan53555_device_info *di = rdev_get_drvdata(rdev);

	return regmap_update_bits(di->regmap, di->sleep_reg,
				  VSEL_BUCK_EN, VSEL_BUCK_EN);
}

static int fan53555_set_suspend_disable(struct regulator_dev *rdev)
{
	struct fan53555_device_info *di = rdev_get_drvdata(rdev);

	return regmap_update_bits(di->regmap, di->sleep_reg,
				  VSEL_BUCK_EN, 0);
}

static int fan53555_set_mode(struct regulator_dev *rdev, unsigned int mode)
{
	struct fan53555_device_info *di = rdev_get_drvdata(rdev);

	switch (mode) {
	case REGULATOR_MODE_FAST:
		regmap_update_bits(di->regmap, di->vol_reg,
				VSEL_MODE, VSEL_MODE);
		break;
	case REGULATOR_MODE_NORMAL:
		regmap_update_bits(di->regmap, di->vol_reg, VSEL_MODE, 0);
		break;
	default:
		return -EINVAL;
	}
	return 0;
}

static unsigned int fan53555_get_mode(struct regulator_dev *rdev)
{
	struct fan53555_device_info *di = rdev_get_drvdata(rdev);
	unsigned int val;
	int ret = 0;

	ret = regmap_read(di->regmap, di->vol_reg, &val);
	if (ret < 0)
		return ret;
	if (val & VSEL_MODE)
		return REGULATOR_MODE_FAST;
	else
		return REGULATOR_MODE_NORMAL;
}

static const int slew_rates[] = {
	64000,
	32000,
	16000,
	 8000,
	 4000,
	 2000,
	 1000,
	  500,
};

static int fan53555_set_ramp(struct regulator_dev *rdev, int ramp)
{
	struct fan53555_device_info *di = rdev_get_drvdata(rdev);
	int regval = -1, i;

	for (i = 0; i < ARRAY_SIZE(slew_rates); i++) {
		if (ramp <= slew_rates[i])
			regval = i;
		else
			break;
	}

	if (regval < 0) {
		dev_err(di->dev, "unsupported ramp value %d\n", ramp);
		return -EINVAL;
	}

	return regmap_update_bits(di->regmap, FAN53555_CONTROL,
				  CTL_SLEW_MASK, regval << CTL_SLEW_SHIFT);
}

static struct regulator_ops fan53555_regulator_ops = {
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.set_voltage_time_sel = regulator_set_voltage_time_sel,
	.map_voltage = regulator_map_voltage_linear,
	.list_voltage = regulator_list_voltage_linear,
	.set_suspend_voltage = fan53555_set_suspend_voltage,
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	.is_enabled = regulator_is_enabled_regmap,
	.set_mode = fan53555_set_mode,
	.get_mode = fan53555_get_mode,
	.set_ramp_delay = fan53555_set_ramp,
	.set_suspend_enable = fan53555_set_suspend_enable,
	.set_suspend_disable = fan53555_set_suspend_disable,
};

static int fan53555_voltages_setup_fairchild(struct fan53555_device_info *di)
{
	/* Init voltage range and step */
	switch (di->chip_id) {
	case FAN53555_CHIP_ID_00:
		switch (di->chip_rev) {
		case FAN53555_CHIP_REV_00:
			di->vsel_min = 600000;
			di->vsel_step = 10000;
			break;
		case FAN53555_CHIP_REV_13:
			di->vsel_min = 800000;
			di->vsel_step = 10000;
			break;
		default:
			dev_err(di->dev,
				"Chip ID %d with rev %d not supported!\n",
				di->chip_id, di->chip_rev);
			return -EINVAL;
		}
		break;
	case FAN53555_CHIP_ID_01:
	case FAN53555_CHIP_ID_03:
	case FAN53555_CHIP_ID_05:
	case FAN53555_CHIP_ID_08:
		di->vsel_min = 600000;
		di->vsel_step = 10000;
		break;
	case FAN53555_CHIP_ID_04:
		di->vsel_min = 603000;
		di->vsel_step = 12826;
		break;
	default:
		dev_err(di->dev,
			"Chip ID %d not supported!\n", di->chip_id);
		return -EINVAL;
	}

	return 0;
}

static int fan53555_voltages_setup_silergy(struct fan53555_device_info *di)
{
	/* Init voltage range and step */
	switch (di->chip_id) {
	case SILERGY_SYR82X:
		di->vsel_min = 712500;
		di->vsel_step = 12500;
		break;
	default:
		dev_err(di->dev,
			"Chip ID %d not supported!\n", di->chip_id);
		return -EINVAL;
	}

	return 0;
}

/* For 00,01,03,05 options:
 * VOUT = 0.60V + NSELx * 10mV, from 0.60 to 1.23V.
 * For 04 option:
 * VOUT = 0.603V + NSELx * 12.826mV, from 0.603 to 1.411V.
 * */
static int fan53555_device_setup(struct fan53555_device_info *di,
				struct fan53555_platform_data *pdata)
{
	int ret = 0;

	/* Setup voltage control register */
	switch (pdata->sleep_vsel_id) {
	case FAN53555_VSEL_ID_0:
		di->sleep_reg = FAN53555_VSEL0;
		di->vol_reg = FAN53555_VSEL1;
		break;
	case FAN53555_VSEL_ID_1:
		di->sleep_reg = FAN53555_VSEL1;
		di->vol_reg = FAN53555_VSEL0;
		break;
	default:
		dev_err(di->dev, "Invalid VSEL ID!\n");
		return -EINVAL;
	}

	switch (di->vendor) {
	case FAN53555_VENDOR_FAIRCHILD:
		ret = fan53555_voltages_setup_fairchild(di);
		break;
	case FAN53555_VENDOR_SILERGY:
		ret = fan53555_voltages_setup_silergy(di);
		break;
	default:
		dev_err(di->dev, "vendor %d not supported!\n", di->vendor);
		return -EINVAL;
	}

	return ret;
}

static int fan53555_regulator_register(struct fan53555_device_info *di,
			struct regulator_config *config)
{
	struct regulator_desc *rdesc = &di->desc;

	rdesc->name = "fan53555-reg";
	rdesc->supply_name = "vin";
	rdesc->ops = &fan53555_regulator_ops;
	rdesc->type = REGULATOR_VOLTAGE;
	rdesc->n_voltages = FAN53555_NVOLTAGES;
	rdesc->enable_reg = di->vol_reg;
	rdesc->enable_mask = VSEL_BUCK_EN;
	rdesc->min_uV = di->vsel_min;
	rdesc->uV_step = di->vsel_step;
	rdesc->vsel_reg = di->vol_reg;
	rdesc->vsel_mask = VSEL_NSEL_MASK;
	rdesc->owner = THIS_MODULE;

	di->rdev = devm_regulator_register(di->dev, &di->desc, config);
	return PTR_ERR_OR_ZERO(di->rdev);
}

static const struct regmap_config fan53555_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
};

static struct fan53555_platform_data *fan53555_parse_dt(struct device *dev,
					      struct device_node *np,
					      const struct regulator_desc *desc)
{
	struct fan53555_platform_data *pdata;
	int ret;
	u32 tmp;

	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata)
		return NULL;

	pdata->regulator = of_get_regulator_init_data(dev, np, desc);

	ret = of_property_read_u32(np, "fcs,suspend-voltage-selector",
				   &tmp);
	if (!ret)
		pdata->sleep_vsel_id = tmp;

	return pdata;
}

static const struct of_device_id fan53555_dt_ids[] = {
	{
		.compatible = "fcs,fan53555",
		.data = (void *)FAN53555_VENDOR_FAIRCHILD
	}, {
		.compatible = "silergy,syr827",
		.data = (void *)FAN53555_VENDOR_SILERGY,
	}, {
		.compatible = "silergy,syr828",
		.data = (void *)FAN53555_VENDOR_SILERGY,
	},
	{ }
};
MODULE_DEVICE_TABLE(of, fan53555_dt_ids);

static int fan53555_regulator_probe(struct i2c_client *client,
				const struct i2c_device_id *id)
{
	struct device_node *np = client->dev.of_node;
	struct fan53555_device_info *di;
	struct fan53555_platform_data *pdata;
	struct regulator_config config = { };
	unsigned int val;
	int ret;

	di = devm_kzalloc(&client->dev, sizeof(struct fan53555_device_info),
					GFP_KERNEL);
	if (!di)
		return -ENOMEM;

	pdata = dev_get_platdata(&client->dev);
	if (!pdata)
		pdata = fan53555_parse_dt(&client->dev, np, &di->desc);

	if (!pdata || !pdata->regulator) {
		dev_err(&client->dev, "Platform data not found!\n");
		return -ENODEV;
	}

	di->regulator = pdata->regulator;
	if (client->dev.of_node) {
		const struct of_device_id *match;

		match = of_match_device(of_match_ptr(fan53555_dt_ids),
					&client->dev);
		if (!match)
			return -ENODEV;

		di->vendor = (unsigned long) match->data;
	} else {
		/* if no ramp constraint set, get the pdata ramp_delay */
		if (!di->regulator->constraints.ramp_delay) {
			int slew_idx = (pdata->slew_rate & 0x7)
						? pdata->slew_rate : 0;

			di->regulator->constraints.ramp_delay
						= slew_rates[slew_idx];
		}

		di->vendor = id->driver_data;
	}

	di->regmap = devm_regmap_init_i2c(client, &fan53555_regmap_config);
	if (IS_ERR(di->regmap)) {
		dev_err(&client->dev, "Failed to allocate regmap!\n");
		return PTR_ERR(di->regmap);
	}
	di->dev = &client->dev;
	i2c_set_clientdata(client, di);
	/* Get chip ID */
	ret = regmap_read(di->regmap, FAN53555_ID1, &val);
	if (ret < 0) {
		dev_err(&client->dev, "Failed to get chip ID!\n");
		return ret;
	}
	di->chip_id = val & DIE_ID;
	/* Get chip revision */
	ret = regmap_read(di->regmap, FAN53555_ID2, &val);
	if (ret < 0) {
		dev_err(&client->dev, "Failed to get chip Rev!\n");
		return ret;
	}
	di->chip_rev = val & DIE_REV;
	dev_info(&client->dev, "FAN53555 Option[%d] Rev[%d] Detected!\n",
				di->chip_id, di->chip_rev);
	/* Device init */
	ret = fan53555_device_setup(di, pdata);
	if (ret < 0) {
		dev_err(&client->dev, "Failed to setup device!\n");
		return ret;
	}
	/* Register regulator */
	config.dev = di->dev;
	config.init_data = di->regulator;
	config.regmap = di->regmap;
	config.driver_data = di;
	config.of_node = np;

	ret = fan53555_regulator_register(di, &config);
	if (ret < 0)
		dev_err(&client->dev, "Failed to register regulator!\n");
	return ret;

}

static const struct i2c_device_id fan53555_id[] = {
	{
		.name = "fan53555",
		.driver_data = FAN53555_VENDOR_FAIRCHILD
	}, {
		.name = "syr82x",
		.driver_data = FAN53555_VENDOR_SILERGY
	},
	{ },
};
MODULE_DEVICE_TABLE(i2c, fan53555_id);

static struct i2c_driver fan53555_regulator_driver = {
	.driver = {
		.name = "fan53555-regulator",
		.of_match_table = of_match_ptr(fan53555_dt_ids),
	},
	.probe = fan53555_regulator_probe,
	.id_table = fan53555_id,
};

module_i2c_driver(fan53555_regulator_driver);

MODULE_AUTHOR("Yunfan Zhang <yfzhang@marvell.com>");
MODULE_DESCRIPTION("FAN53555 regulator driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
49d8c599 YZ	1	/*
	2	* FAN53555 Fairchild Digitally Programmable TinyBuck Regulator Driver.
	3	*
	4	* Supported Part Numbers:
	5	* FAN53555UC00X/01X/03X/04X/05X
	6	*
	7	* Copyright (c) 2012 Marvell Technology Ltd.
	8	* Yunfan Zhang <yfzhang@marvell.com>
	9	*
	10	* This package is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License version 2 as
	12	* published by the Free Software Foundation.
	13	*
	14	*/
	15	#include <linux/module.h>
	16	#include <linux/param.h>
	17	#include <linux/err.h>
	18	#include <linux/platform_device.h>
	19	#include <linux/regulator/driver.h>
	20	#include <linux/regulator/machine.h>
91f23d8f HS	21	#include <linux/regulator/of_regulator.h>
91f23d8f HS	22	#include <linux/of_device.h>
49d8c599 YZ	23	#include <linux/i2c.h>
	24	#include <linux/slab.h>
	25	#include <linux/regmap.h>
	26	#include <linux/regulator/fan53555.h>
	27
	28	/* Voltage setting */
	29	#define FAN53555_VSEL0 0x00
	30	#define FAN53555_VSEL1 0x01
	31	/* Control register */
	32	#define FAN53555_CONTROL 0x02
	33	/* IC Type */
	34	#define FAN53555_ID1 0x03
	35	/* IC mask version */
	36	#define FAN53555_ID2 0x04
	37	/* Monitor register */
	38	#define FAN53555_MONITOR 0x05
	39
	40	/* VSEL bit definitions */
	41	#define VSEL_BUCK_EN (1 << 7)
	42	#define VSEL_MODE (1 << 6)
	43	#define VSEL_NSEL_MASK 0x3F
	44	/* Chip ID and Verison */
	45	#define DIE_ID 0x0F /* ID1 */
	46	#define DIE_REV 0x0F /* ID2 */
	47	/* Control bit definitions */
	48	#define CTL_OUTPUT_DISCHG (1 << 7)
	49	#define CTL_SLEW_MASK (0x7 << 4)
	50	#define CTL_SLEW_SHIFT 4
	51	#define CTL_RESET (1 << 2)
	52
	53	#define FAN53555_NVOLTAGES 64 /* Numbers of voltages */
	54
ee30928a HS	55	enum fan53555_vendor {
	56	FAN53555_VENDOR_FAIRCHILD = 0,
	57	FAN53555_VENDOR_SILERGY,
	58	};
	59
49d8c599 YZ	60	/* IC Type */
	61	enum {
	62	FAN53555_CHIP_ID_00 = 0,
	63	FAN53555_CHIP_ID_01,
	64	FAN53555_CHIP_ID_02,
	65	FAN53555_CHIP_ID_03,
	66	FAN53555_CHIP_ID_04,
	67	FAN53555_CHIP_ID_05,
5e39cf49	68	FAN53555_CHIP_ID_08 = 8,
49d8c599 YZ	69	};
49d8c599 YZ	70
e57cbb70 WE	71	/* IC mask revision */
	72	enum {
	73	FAN53555_CHIP_REV_00 = 0x3,
	74	FAN53555_CHIP_REV_13 = 0xf,
	75	};
	76
ee30928a HS	77	enum {
	78	SILERGY_SYR82X = 8,
	79	};
	80
49d8c599	81	struct fan53555_device_info {
ee30928a	82	enum fan53555_vendor vendor;
49d8c599 YZ	83	struct regmap *regmap;
	84	struct device *dev;
	85	struct regulator_desc desc;
	86	struct regulator_dev *rdev;
	87	struct regulator_init_data *regulator;
	88	/* IC Type and Rev */
	89	int chip_id;
	90	int chip_rev;
	91	/* Voltage setting register */
	92	unsigned int vol_reg;
	93	unsigned int sleep_reg;
	94	/* Voltage range and step(linear) */
	95	unsigned int vsel_min;
49d8c599 YZ	96	unsigned int vsel_step;
	97	/* Voltage slew rate limiting */
	98	unsigned int slew_rate;
	99	/* Sleep voltage cache */
	100	unsigned int sleep_vol_cache;
	101	};
	102
	103	static int fan53555_set_suspend_voltage(struct regulator_dev *rdev, int uV)
	104	{
	105	struct fan53555_device_info *di = rdev_get_drvdata(rdev);
	106	int ret;
	107
	108	if (di->sleep_vol_cache == uV)
	109	return 0;
	110	ret = regulator_map_voltage_linear(rdev, uV, uV);
	111	if (ret < 0)
145fe1e1	112	return ret;
49d8c599 YZ	113	ret = regmap_update_bits(di->regmap, di->sleep_reg,
	114	VSEL_NSEL_MASK, ret);
	115	if (ret < 0)
145fe1e1	116	return ret;
49d8c599 YZ	117	/* Cache the sleep voltage setting.
	118	* Might not be the real voltage which is rounded */
	119	di->sleep_vol_cache = uV;
	120
	121	return 0;
	122	}
	123
ab7cad33	124	static int fan53555_set_suspend_enable(struct regulator_dev *rdev)
	125	{
	126	struct fan53555_device_info *di = rdev_get_drvdata(rdev);
	127
	128	return regmap_update_bits(di->regmap, di->sleep_reg,
	129	VSEL_BUCK_EN, VSEL_BUCK_EN);
	130	}
	131
	132	static int fan53555_set_suspend_disable(struct regulator_dev *rdev)
	133	{
	134	struct fan53555_device_info *di = rdev_get_drvdata(rdev);
	135
	136	return regmap_update_bits(di->regmap, di->sleep_reg,
	137	VSEL_BUCK_EN, 0);
	138	}
	139
49d8c599 YZ	140	static int fan53555_set_mode(struct regulator_dev *rdev, unsigned int mode)
	141	{
	142	struct fan53555_device_info *di = rdev_get_drvdata(rdev);
	143
	144	switch (mode) {
	145	case REGULATOR_MODE_FAST:
	146	regmap_update_bits(di->regmap, di->vol_reg,
	147	VSEL_MODE, VSEL_MODE);
	148	break;
	149	case REGULATOR_MODE_NORMAL:
	150	regmap_update_bits(di->regmap, di->vol_reg, VSEL_MODE, 0);
	151	break;
	152	default:
	153	return -EINVAL;
	154	}
	155	return 0;
	156	}
	157
	158	static unsigned int fan53555_get_mode(struct regulator_dev *rdev)
	159	{
	160	struct fan53555_device_info *di = rdev_get_drvdata(rdev);
	161	unsigned int val;
	162	int ret = 0;
	163
	164	ret = regmap_read(di->regmap, di->vol_reg, &val);
	165	if (ret < 0)
	166	return ret;
	167	if (val & VSEL_MODE)
	168	return REGULATOR_MODE_FAST;
	169	else
	170	return REGULATOR_MODE_NORMAL;
	171	}
	172
121b567d	173	static const int slew_rates[] = {
dd7e71fb HS	174	64000,
	175	32000,
	176	16000,
	177	8000,
	178	4000,
	179	2000,
	180	1000,
	181	500,
	182	};
	183
	184	static int fan53555_set_ramp(struct regulator_dev *rdev, int ramp)
	185	{
	186	struct fan53555_device_info *di = rdev_get_drvdata(rdev);
	187	int regval = -1, i;
	188
	189	for (i = 0; i < ARRAY_SIZE(slew_rates); i++) {
	190	if (ramp <= slew_rates[i])
	191	regval = i;
	192	else
	193	break;
	194	}
	195
	196	if (regval < 0) {
	197	dev_err(di->dev, "unsupported ramp value %d\n", ramp);
	198	return -EINVAL;
	199	}
	200
	201	return regmap_update_bits(di->regmap, FAN53555_CONTROL,
	202	CTL_SLEW_MASK, regval << CTL_SLEW_SHIFT);
	203	}
	204
49d8c599 YZ	205	static struct regulator_ops fan53555_regulator_ops = {
	206	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	207	.get_voltage_sel = regulator_get_voltage_sel_regmap,
fda87a42	208	.set_voltage_time_sel = regulator_set_voltage_time_sel,
49d8c599 YZ	209	.map_voltage = regulator_map_voltage_linear,
	210	.list_voltage = regulator_list_voltage_linear,
	211	.set_suspend_voltage = fan53555_set_suspend_voltage,
	212	.enable = regulator_enable_regmap,
	213	.disable = regulator_disable_regmap,
	214	.is_enabled = regulator_is_enabled_regmap,
	215	.set_mode = fan53555_set_mode,
	216	.get_mode = fan53555_get_mode,
dd7e71fb	217	.set_ramp_delay = fan53555_set_ramp,
ab7cad33	218	.set_suspend_enable = fan53555_set_suspend_enable,
ab7cad33	219	.set_suspend_disable = fan53555_set_suspend_disable,
49d8c599 YZ	220	};
49d8c599 YZ	221
ee30928a HS	222	static int fan53555_voltages_setup_fairchild(struct fan53555_device_info *di)
	223	{
	224	/* Init voltage range and step */
	225	switch (di->chip_id) {
	226	case FAN53555_CHIP_ID_00:
e57cbb70 WE	227	switch (di->chip_rev) {
	228	case FAN53555_CHIP_REV_00:
	229	di->vsel_min = 600000;
	230	di->vsel_step = 10000;
	231	break;
	232	case FAN53555_CHIP_REV_13:
	233	di->vsel_min = 800000;
	234	di->vsel_step = 10000;
	235	break;
	236	default:
	237	dev_err(di->dev,
	238	"Chip ID %d with rev %d not supported!\n",
	239	di->chip_id, di->chip_rev);
	240	return -EINVAL;
	241	}
	242	break;
ee30928a HS	243	case FAN53555_CHIP_ID_01:
	244	case FAN53555_CHIP_ID_03:
	245	case FAN53555_CHIP_ID_05:
5e39cf49	246	case FAN53555_CHIP_ID_08:
ee30928a HS	247	di->vsel_min = 600000;
	248	di->vsel_step = 10000;
	249	break;
	250	case FAN53555_CHIP_ID_04:
	251	di->vsel_min = 603000;
	252	di->vsel_step = 12826;
	253	break;
	254	default:
	255	dev_err(di->dev,
	256	"Chip ID %d not supported!\n", di->chip_id);
	257	return -EINVAL;
	258	}
	259
	260	return 0;
	261	}
	262
	263	static int fan53555_voltages_setup_silergy(struct fan53555_device_info *di)
	264	{
	265	/* Init voltage range and step */
	266	switch (di->chip_id) {
	267	case SILERGY_SYR82X:
	268	di->vsel_min = 712500;
	269	di->vsel_step = 12500;
	270	break;
	271	default:
	272	dev_err(di->dev,
	273	"Chip ID %d not supported!\n", di->chip_id);
	274	return -EINVAL;
	275	}
	276
	277	return 0;
	278	}
	279
49d8c599 YZ	280	/* For 00,01,03,05 options:
	281	* VOUT = 0.60V + NSELx * 10mV, from 0.60 to 1.23V.
	282	* For 04 option:
	283	* VOUT = 0.603V + NSELx * 12.826mV, from 0.603 to 1.411V.
	284	* */
	285	static int fan53555_device_setup(struct fan53555_device_info *di,
	286	struct fan53555_platform_data *pdata)
	287	{
ee30928a HS	288	int ret = 0;
ee30928a HS	289
49d8c599 YZ	290	/* Setup voltage control register */
	291	switch (pdata->sleep_vsel_id) {
	292	case FAN53555_VSEL_ID_0:
	293	di->sleep_reg = FAN53555_VSEL0;
	294	di->vol_reg = FAN53555_VSEL1;
	295	break;
	296	case FAN53555_VSEL_ID_1:
	297	di->sleep_reg = FAN53555_VSEL1;
	298	di->vol_reg = FAN53555_VSEL0;
	299	break;
	300	default:
	301	dev_err(di->dev, "Invalid VSEL ID!\n");
	302	return -EINVAL;
	303	}
ee30928a HS	304
	305	switch (di->vendor) {
	306	case FAN53555_VENDOR_FAIRCHILD:
	307	ret = fan53555_voltages_setup_fairchild(di);
49d8c599	308	break;
ee30928a HS	309	case FAN53555_VENDOR_SILERGY:
ee30928a HS	310	ret = fan53555_voltages_setup_silergy(di);
49d8c599 YZ	311	break;
49d8c599 YZ	312	default:
fe230531	313	dev_err(di->dev, "vendor %d not supported!\n", di->vendor);
49d8c599 YZ	314	return -EINVAL;
49d8c599 YZ	315	}
dd7e71fb	316
ee30928a	317	return ret;
49d8c599 YZ	318	}
	319
	320	static int fan53555_regulator_register(struct fan53555_device_info *di,
	321	struct regulator_config *config)
	322	{
	323	struct regulator_desc *rdesc = &di->desc;
	324
	325	rdesc->name = "fan53555-reg";
3415d601	326	rdesc->supply_name = "vin";
49d8c599 YZ	327	rdesc->ops = &fan53555_regulator_ops;
	328	rdesc->type = REGULATOR_VOLTAGE;
	329	rdesc->n_voltages = FAN53555_NVOLTAGES;
	330	rdesc->enable_reg = di->vol_reg;
	331	rdesc->enable_mask = VSEL_BUCK_EN;
	332	rdesc->min_uV = di->vsel_min;
	333	rdesc->uV_step = di->vsel_step;
	334	rdesc->vsel_reg = di->vol_reg;
	335	rdesc->vsel_mask = VSEL_NSEL_MASK;
	336	rdesc->owner = THIS_MODULE;
	337
b15f5f76	338	di->rdev = devm_regulator_register(di->dev, &di->desc, config);
8c6ffba0	339	return PTR_ERR_OR_ZERO(di->rdev);
49d8c599 YZ	340	}
49d8c599 YZ	341
121b567d	342	static const struct regmap_config fan53555_regmap_config = {
49d8c599 YZ	343	.reg_bits = 8,
	344	.val_bits = 8,
	345	};
	346
91f23d8f	347	static struct fan53555_platform_data fan53555_parse_dt(struct device dev,
072e78b1 JMC	348	struct device_node *np,
072e78b1 JMC	349	const struct regulator_desc *desc)
91f23d8f HS	350	{
	351	struct fan53555_platform_data *pdata;
	352	int ret;
	353	u32 tmp;
	354
	355	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
	356	if (!pdata)
	357	return NULL;
	358
072e78b1	359	pdata->regulator = of_get_regulator_init_data(dev, np, desc);
91f23d8f HS	360
	361	ret = of_property_read_u32(np, "fcs,suspend-voltage-selector",
	362	&tmp);
	363	if (!ret)
	364	pdata->sleep_vsel_id = tmp;
	365
	366	return pdata;
	367	}
	368
	369	static const struct of_device_id fan53555_dt_ids[] = {
	370	{
	371	.compatible = "fcs,fan53555",
ee30928a HS	372	.data = (void *)FAN53555_VENDOR_FAIRCHILD
	373	}, {
	374	.compatible = "silergy,syr827",
	375	.data = (void *)FAN53555_VENDOR_SILERGY,
	376	}, {
	377	.compatible = "silergy,syr828",
	378	.data = (void *)FAN53555_VENDOR_SILERGY,
91f23d8f HS	379	},
	380	{ }
	381	};
	382	MODULE_DEVICE_TABLE(of, fan53555_dt_ids);
	383
a5023574	384	static int fan53555_regulator_probe(struct i2c_client *client,
49d8c599 YZ	385	const struct i2c_device_id *id)
49d8c599 YZ	386	{
91f23d8f	387	struct device_node *np = client->dev.of_node;
49d8c599 YZ	388	struct fan53555_device_info *di;
	389	struct fan53555_platform_data *pdata;
	390	struct regulator_config config = { };
	391	unsigned int val;
	392	int ret;
	393
072e78b1 JMC	394	di = devm_kzalloc(&client->dev, sizeof(struct fan53555_device_info),
	395	GFP_KERNEL);
	396	if (!di)
	397	return -ENOMEM;
	398
dff91d0b	399	pdata = dev_get_platdata(&client->dev);
91f23d8f	400	if (!pdata)
072e78b1	401	pdata = fan53555_parse_dt(&client->dev, np, &di->desc);
91f23d8f	402
49d8c599 YZ	403	if (!pdata \|\| !pdata->regulator) {
	404	dev_err(&client->dev, "Platform data not found!\n");
	405	return -ENODEV;
	406	}
	407
e13426bf	408	di->regulator = pdata->regulator;
ee30928a HS	409	if (client->dev.of_node) {
	410	const struct of_device_id *match;
	411
	412	match = of_match_device(of_match_ptr(fan53555_dt_ids),
	413	&client->dev);
	414	if (!match)
	415	return -ENODEV;
	416
6f34163c	417	di->vendor = (unsigned long) match->data;
ee30928a	418	} else {
91f23d8f HS	419	/* if no ramp constraint set, get the pdata ramp_delay */
	420	if (!di->regulator->constraints.ramp_delay) {
	421	int slew_idx = (pdata->slew_rate & 0x7)
	422	? pdata->slew_rate : 0;
dd7e71fb	423
91f23d8f HS	424	di->regulator->constraints.ramp_delay
	425	= slew_rates[slew_idx];
	426	}
ee30928a HS	427
ee30928a HS	428	di->vendor = id->driver_data;
dd7e71fb HS	429	}
dd7e71fb HS	430
49d8c599 YZ	431	di->regmap = devm_regmap_init_i2c(client, &fan53555_regmap_config);
	432	if (IS_ERR(di->regmap)) {
	433	dev_err(&client->dev, "Failed to allocate regmap!\n");
	434	return PTR_ERR(di->regmap);
	435	}
	436	di->dev = &client->dev;
49d8c599 YZ	437	i2c_set_clientdata(client, di);
	438	/* Get chip ID */
	439	ret = regmap_read(di->regmap, FAN53555_ID1, &val);
	440	if (ret < 0) {
	441	dev_err(&client->dev, "Failed to get chip ID!\n");
145fe1e1	442	return ret;
49d8c599 YZ	443	}
	444	di->chip_id = val & DIE_ID;
	445	/* Get chip revision */
	446	ret = regmap_read(di->regmap, FAN53555_ID2, &val);
	447	if (ret < 0) {
	448	dev_err(&client->dev, "Failed to get chip Rev!\n");
145fe1e1	449	return ret;
49d8c599 YZ	450	}
	451	di->chip_rev = val & DIE_REV;
	452	dev_info(&client->dev, "FAN53555 Option[%d] Rev[%d] Detected!\n",
	453	di->chip_id, di->chip_rev);
	454	/* Device init */
	455	ret = fan53555_device_setup(di, pdata);
	456	if (ret < 0) {
	457	dev_err(&client->dev, "Failed to setup device!\n");
	458	return ret;
	459	}
	460	/* Register regulator */
	461	config.dev = di->dev;
	462	config.init_data = di->regulator;
	463	config.regmap = di->regmap;
	464	config.driver_data = di;
91f23d8f HS	465	config.of_node = np;
91f23d8f HS	466
49d8c599 YZ	467	ret = fan53555_regulator_register(di, &config);
	468	if (ret < 0)
	469	dev_err(&client->dev, "Failed to register regulator!\n");
	470	return ret;
	471
	472	}
	473
49d8c599	474	static const struct i2c_device_id fan53555_id[] = {
ee30928a HS	475	{
	476	.name = "fan53555",
	477	.driver_data = FAN53555_VENDOR_FAIRCHILD
	478	}, {
	479	.name = "syr82x",
	480	.driver_data = FAN53555_VENDOR_SILERGY
	481	},
49d8c599 YZ	482	{ },
49d8c599 YZ	483	};
e80c47bd	484	MODULE_DEVICE_TABLE(i2c, fan53555_id);
49d8c599 YZ	485
	486	static struct i2c_driver fan53555_regulator_driver = {
	487	.driver = {
	488	.name = "fan53555-regulator",
91f23d8f	489	.of_match_table = of_match_ptr(fan53555_dt_ids),
49d8c599 YZ	490	},
49d8c599 YZ	491	.probe = fan53555_regulator_probe,
49d8c599 YZ	492	.id_table = fan53555_id,
	493	};
	494
	495	module_i2c_driver(fan53555_regulator_driver);
	496
	497	MODULE_AUTHOR("Yunfan Zhang <yfzhang@marvell.com>");
	498	MODULE_DESCRIPTION("FAN53555 regulator driver");
	499	MODULE_LICENSE("GPL v2");