[linux-block.git] / drivers / regulator / sy8827n.c

// SPDX-License-Identifier: GPL-2.0
//
// SY8827N regulator driver
//
// Copyright (C) 2020 Synaptics Incorporated
//
// Author: Jisheng Zhang <jszhang@kernel.org>

#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/of_device.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/of_regulator.h>

#define SY8827N_VSEL0		0
#define   SY8827N_BUCK_EN	(1 << 7)
#define   SY8827N_MODE		(1 << 6)
#define SY8827N_VSEL1		1
#define SY8827N_CTRL		2
#define SY8827N_ID1		3
#define SY8827N_ID2		4
#define SY8827N_PGOOD		5
#define SY8827N_MAX		(SY8827N_PGOOD + 1)

#define SY8827N_NVOLTAGES	64
#define SY8827N_VSELMIN		600000
#define SY8827N_VSELSTEP	12500

struct sy8827n_device_info {
	struct device *dev;
	struct regulator_desc desc;
	struct regulator_init_data *regulator;
	struct gpio_desc *en_gpio;
	unsigned int vsel_reg;
};

static int sy8827n_set_mode(struct regulator_dev *rdev, unsigned int mode)
{
	struct sy8827n_device_info *di = rdev_get_drvdata(rdev);

	switch (mode) {
	case REGULATOR_MODE_FAST:
		regmap_update_bits(rdev->regmap, di->vsel_reg,
				   SY8827N_MODE, SY8827N_MODE);
		break;
	case REGULATOR_MODE_NORMAL:
		regmap_update_bits(rdev->regmap, di->vsel_reg,
				   SY8827N_MODE, 0);
		break;
	default:
		return -EINVAL;
	}
	return 0;
}

static unsigned int sy8827n_get_mode(struct regulator_dev *rdev)
{
	struct sy8827n_device_info *di = rdev_get_drvdata(rdev);
	u32 val;
	int ret = 0;

	ret = regmap_read(rdev->regmap, di->vsel_reg, &val);
	if (ret < 0)
		return ret;
	if (val & SY8827N_MODE)
		return REGULATOR_MODE_FAST;
	else
		return REGULATOR_MODE_NORMAL;
}

static const struct regulator_ops sy8827n_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,
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	.is_enabled = regulator_is_enabled_regmap,
	.set_mode = sy8827n_set_mode,
	.get_mode = sy8827n_get_mode,
};

static int sy8827n_regulator_register(struct sy8827n_device_info *di,
			struct regulator_config *config)
{
	struct regulator_desc *rdesc = &di->desc;
	struct regulator_dev *rdev;

	rdesc->name = "sy8827n-reg";
	rdesc->supply_name = "vin";
	rdesc->ops = &sy8827n_regulator_ops;
	rdesc->type = REGULATOR_VOLTAGE;
	rdesc->n_voltages = SY8827N_NVOLTAGES;
	rdesc->enable_reg = di->vsel_reg;
	rdesc->enable_mask = SY8827N_BUCK_EN;
	rdesc->min_uV = SY8827N_VSELMIN;
	rdesc->uV_step = SY8827N_VSELSTEP;
	rdesc->vsel_reg = di->vsel_reg;
	rdesc->vsel_mask = rdesc->n_voltages - 1;
	rdesc->owner = THIS_MODULE;

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

static bool sy8827n_volatile_reg(struct device *dev, unsigned int reg)
{
	if (reg == SY8827N_PGOOD)
		return true;
	return false;
}

static const struct regmap_config sy8827n_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.volatile_reg = sy8827n_volatile_reg,
	.num_reg_defaults_raw = SY8827N_MAX,
	.cache_type = REGCACHE_FLAT,
};

static int sy8827n_i2c_probe(struct i2c_client *client)
{
	struct device *dev = &client->dev;
	struct device_node *np = dev->of_node;
	struct sy8827n_device_info *di;
	struct regulator_config config = { };
	struct regmap *regmap;
	int ret;

	di = devm_kzalloc(dev, sizeof(struct sy8827n_device_info), GFP_KERNEL);
	if (!di)
		return -ENOMEM;

	di->regulator = of_get_regulator_init_data(dev, np, &di->desc);
	if (!di->regulator) {
		dev_err(dev, "Platform data not found!\n");
		return -EINVAL;
	}

	di->en_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_HIGH);
	if (IS_ERR(di->en_gpio))
		return PTR_ERR(di->en_gpio);

	if (of_property_read_bool(np, "silergy,vsel-state-high"))
		di->vsel_reg = SY8827N_VSEL1;
	else
		di->vsel_reg = SY8827N_VSEL0;

	di->dev = dev;

	regmap = devm_regmap_init_i2c(client, &sy8827n_regmap_config);
	if (IS_ERR(regmap)) {
		dev_err(dev, "Failed to allocate regmap!\n");
		return PTR_ERR(regmap);
	}
	i2c_set_clientdata(client, di);

	config.dev = di->dev;
	config.init_data = di->regulator;
	config.regmap = regmap;
	config.driver_data = di;
	config.of_node = np;

	ret = sy8827n_regulator_register(di, &config);
	if (ret < 0)
		dev_err(dev, "Failed to register regulator!\n");
	return ret;
}

static const struct of_device_id sy8827n_dt_ids[] = {
	{
		.compatible = "silergy,sy8827n",
	},
	{ }
};
MODULE_DEVICE_TABLE(of, sy8827n_dt_ids);

static const struct i2c_device_id sy8827n_id[] = {
	{ "sy8827n", },
	{ },
};
MODULE_DEVICE_TABLE(i2c, sy8827n_id);

static struct i2c_driver sy8827n_regulator_driver = {
	.driver = {
		.name = "sy8827n-regulator",
		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
		.of_match_table = sy8827n_dt_ids,
	},
	.probe = sy8827n_i2c_probe,
	.id_table = sy8827n_id,
};
module_i2c_driver(sy8827n_regulator_driver);

MODULE_AUTHOR("Jisheng Zhang <jszhang@kernel.org>");
MODULE_DESCRIPTION("SY8827N regulator driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
38fc6f29 JZ	1	// SPDX-License-Identifier: GPL-2.0
	2	//
	3	// SY8827N regulator driver
	4	//
	5	// Copyright (C) 2020 Synaptics Incorporated
	6	//
	7	// Author: Jisheng Zhang <jszhang@kernel.org>
	8
	9	#include <linux/gpio/consumer.h>
	10	#include <linux/module.h>
	11	#include <linux/i2c.h>
	12	#include <linux/of_device.h>
	13	#include <linux/regmap.h>
	14	#include <linux/regulator/driver.h>
	15	#include <linux/regulator/of_regulator.h>
	16
	17	#define SY8827N_VSEL0 0
	18	#define SY8827N_BUCK_EN (1 << 7)
	19	#define SY8827N_MODE (1 << 6)
	20	#define SY8827N_VSEL1 1
	21	#define SY8827N_CTRL 2
6bdd1c67 JZ	22	#define SY8827N_ID1 3
	23	#define SY8827N_ID2 4
	24	#define SY8827N_PGOOD 5
	25	#define SY8827N_MAX (SY8827N_PGOOD + 1)
38fc6f29 JZ	26
	27	#define SY8827N_NVOLTAGES 64
	28	#define SY8827N_VSELMIN 600000
	29	#define SY8827N_VSELSTEP 12500
	30
	31	struct sy8827n_device_info {
	32	struct device *dev;
	33	struct regulator_desc desc;
	34	struct regulator_init_data *regulator;
	35	struct gpio_desc *en_gpio;
	36	unsigned int vsel_reg;
	37	};
	38
	39	static int sy8827n_set_mode(struct regulator_dev *rdev, unsigned int mode)
	40	{
	41	struct sy8827n_device_info *di = rdev_get_drvdata(rdev);
	42
	43	switch (mode) {
	44	case REGULATOR_MODE_FAST:
	45	regmap_update_bits(rdev->regmap, di->vsel_reg,
	46	SY8827N_MODE, SY8827N_MODE);
	47	break;
	48	case REGULATOR_MODE_NORMAL:
	49	regmap_update_bits(rdev->regmap, di->vsel_reg,
	50	SY8827N_MODE, 0);
	51	break;
	52	default:
	53	return -EINVAL;
	54	}
	55	return 0;
	56	}
	57
	58	static unsigned int sy8827n_get_mode(struct regulator_dev *rdev)
	59	{
	60	struct sy8827n_device_info *di = rdev_get_drvdata(rdev);
	61	u32 val;
	62	int ret = 0;
	63
	64	ret = regmap_read(rdev->regmap, di->vsel_reg, &val);
	65	if (ret < 0)
	66	return ret;
	67	if (val & SY8827N_MODE)
	68	return REGULATOR_MODE_FAST;
	69	else
	70	return REGULATOR_MODE_NORMAL;
	71	}
	72
	73	static const struct regulator_ops sy8827n_regulator_ops = {
	74	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	75	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	76	.set_voltage_time_sel = regulator_set_voltage_time_sel,
	77	.map_voltage = regulator_map_voltage_linear,
	78	.list_voltage = regulator_list_voltage_linear,
	79	.enable = regulator_enable_regmap,
	80	.disable = regulator_disable_regmap,
	81	.is_enabled = regulator_is_enabled_regmap,
	82	.set_mode = sy8827n_set_mode,
	83	.get_mode = sy8827n_get_mode,
	84	};
	85
	86	static int sy8827n_regulator_register(struct sy8827n_device_info *di,
	87	struct regulator_config *config)
	88	{
	89	struct regulator_desc *rdesc = &di->desc;
90	struct regulator_dev *rdev;
91
92	rdesc->name = "sy8827n-reg";
93	rdesc->supply_name = "vin";
94	rdesc->ops = &sy8827n_regulator_ops;
95	rdesc->type = REGULATOR_VOLTAGE;
96	rdesc->n_voltages = SY8827N_NVOLTAGES;
97	rdesc->enable_reg = di->vsel_reg;
98	rdesc->enable_mask = SY8827N_BUCK_EN;
99	rdesc->min_uV = SY8827N_VSELMIN;
100	rdesc->uV_step = SY8827N_VSELSTEP;
101	rdesc->vsel_reg = di->vsel_reg;
102	rdesc->vsel_mask = rdesc->n_voltages - 1;
103	rdesc->owner = THIS_MODULE;
104
105	rdev = devm_regulator_register(di->dev, &di->desc, config);
106	return PTR_ERR_OR_ZERO(rdev);
107	}
108
6bdd1c67 JZ	109	static bool sy8827n_volatile_reg(struct device *dev, unsigned int reg)
	110	{
	111	if (reg == SY8827N_PGOOD)
	112	return true;
	113	return false;
	114	}
	115
38fc6f29 JZ	116	static const struct regmap_config sy8827n_regmap_config = {
	117	.reg_bits = 8,
	118	.val_bits = 8,
6bdd1c67 JZ	119	.volatile_reg = sy8827n_volatile_reg,
	120	.num_reg_defaults_raw = SY8827N_MAX,
	121	.cache_type = REGCACHE_FLAT,
38fc6f29 JZ	122	};
	123
	124	static int sy8827n_i2c_probe(struct i2c_client *client)
	125	{
	126	struct device *dev = &client->dev;
	127	struct device_node *np = dev->of_node;
	128	struct sy8827n_device_info *di;
	129	struct regulator_config config = { };
	130	struct regmap *regmap;
	131	int ret;
	132
	133	di = devm_kzalloc(dev, sizeof(struct sy8827n_device_info), GFP_KERNEL);
	134	if (!di)
	135	return -ENOMEM;
	136
	137	di->regulator = of_get_regulator_init_data(dev, np, &di->desc);
	138	if (!di->regulator) {
	139	dev_err(dev, "Platform data not found!\n");
	140	return -EINVAL;
	141	}
	142
	143	di->en_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_HIGH);
	144	if (IS_ERR(di->en_gpio))
	145	return PTR_ERR(di->en_gpio);
	146
	147	if (of_property_read_bool(np, "silergy,vsel-state-high"))
	148	di->vsel_reg = SY8827N_VSEL1;
	149	else
	150	di->vsel_reg = SY8827N_VSEL0;
	151
	152	di->dev = dev;
	153
	154	regmap = devm_regmap_init_i2c(client, &sy8827n_regmap_config);
	155	if (IS_ERR(regmap)) {
	156	dev_err(dev, "Failed to allocate regmap!\n");
	157	return PTR_ERR(regmap);
	158	}
	159	i2c_set_clientdata(client, di);
	160
	161	config.dev = di->dev;
	162	config.init_data = di->regulator;
	163	config.regmap = regmap;
	164	config.driver_data = di;
	165	config.of_node = np;
	166
	167	ret = sy8827n_regulator_register(di, &config);
	168	if (ret < 0)
	169	dev_err(dev, "Failed to register regulator!\n");
	170	return ret;
	171	}
	172
	173	static const struct of_device_id sy8827n_dt_ids[] = {
	174	{
	175	.compatible = "silergy,sy8827n",
	176	},
	177	{ }
	178	};
	179	MODULE_DEVICE_TABLE(of, sy8827n_dt_ids);
	180
	181	static const struct i2c_device_id sy8827n_id[] = {
	182	{ "sy8827n", },
	183	{ },
	184	};
	185	MODULE_DEVICE_TABLE(i2c, sy8827n_id);
186
187	static struct i2c_driver sy8827n_regulator_driver = {
188	.driver = {
189	.name = "sy8827n-regulator",
67dc71c6	190	.probe_type = PROBE_PREFER_ASYNCHRONOUS,
c4b02c92	191	.of_match_table = sy8827n_dt_ids,
38fc6f29	192	},
964e1865	193	.probe = sy8827n_i2c_probe,
38fc6f29 JZ	194	.id_table = sy8827n_id,
	195	};
	196	module_i2c_driver(sy8827n_regulator_driver);
	197
	198	MODULE_AUTHOR("Jisheng Zhang <jszhang@kernel.org>");
	199	MODULE_DESCRIPTION("SY8827N regulator driver");
	200	MODULE_LICENSE("GPL v2");