[mirror_ubuntu-jammy-kernel.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_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 const struct regmap_config sy8827n_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
};

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;
}

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

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",
		.of_match_table = of_match_ptr(sy8827n_dt_ids),
	},
	.probe_new = 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
	22
	23	#define SY8827N_NVOLTAGES 64
	24	#define SY8827N_VSELMIN 600000
	25	#define SY8827N_VSELSTEP 12500
	26
	27	struct sy8827n_device_info {
	28	struct device *dev;
	29	struct regulator_desc desc;
	30	struct regulator_init_data *regulator;
	31	struct gpio_desc *en_gpio;
	32	unsigned int vsel_reg;
	33	};
	34
	35	static int sy8827n_set_mode(struct regulator_dev *rdev, unsigned int mode)
	36	{
	37	struct sy8827n_device_info *di = rdev_get_drvdata(rdev);
	38
	39	switch (mode) {
	40	case REGULATOR_MODE_FAST:
	41	regmap_update_bits(rdev->regmap, di->vsel_reg,
	42	SY8827N_MODE, SY8827N_MODE);
	43	break;
	44	case REGULATOR_MODE_NORMAL:
	45	regmap_update_bits(rdev->regmap, di->vsel_reg,
	46	SY8827N_MODE, 0);
	47	break;
	48	default:
	49	return -EINVAL;
	50	}
	51	return 0;
	52	}
	53
	54	static unsigned int sy8827n_get_mode(struct regulator_dev *rdev)
	55	{
	56	struct sy8827n_device_info *di = rdev_get_drvdata(rdev);
	57	u32 val;
	58	int ret = 0;
	59
	60	ret = regmap_read(rdev->regmap, di->vsel_reg, &val);
	61	if (ret < 0)
	62	return ret;
	63	if (val & SY8827N_MODE)
	64	return REGULATOR_MODE_FAST;
65	else
66	return REGULATOR_MODE_NORMAL;
67	}
68
69	static const struct regulator_ops sy8827n_regulator_ops = {
70	.set_voltage_sel = regulator_set_voltage_sel_regmap,
71	.get_voltage_sel = regulator_get_voltage_sel_regmap,
72	.set_voltage_time_sel = regulator_set_voltage_time_sel,
73	.map_voltage = regulator_map_voltage_linear,
74	.list_voltage = regulator_list_voltage_linear,
75	.enable = regulator_enable_regmap,
76	.disable = regulator_disable_regmap,
77	.is_enabled = regulator_is_enabled_regmap,
78	.set_mode = sy8827n_set_mode,
79	.get_mode = sy8827n_get_mode,
80	};
81
82	static int sy8827n_regulator_register(struct sy8827n_device_info *di,
83	struct regulator_config *config)
84	{
85	struct regulator_desc *rdesc = &di->desc;
86	struct regulator_dev *rdev;
87
88	rdesc->name = "sy8827n-reg";
89	rdesc->supply_name = "vin";
90	rdesc->ops = &sy8827n_regulator_ops;
91	rdesc->type = REGULATOR_VOLTAGE;
92	rdesc->n_voltages = SY8827N_NVOLTAGES;
93	rdesc->enable_reg = di->vsel_reg;
94	rdesc->enable_mask = SY8827N_BUCK_EN;
95	rdesc->min_uV = SY8827N_VSELMIN;
96	rdesc->uV_step = SY8827N_VSELSTEP;
97	rdesc->vsel_reg = di->vsel_reg;
98	rdesc->vsel_mask = rdesc->n_voltages - 1;
99	rdesc->owner = THIS_MODULE;
100
101	rdev = devm_regulator_register(di->dev, &di->desc, config);
102	return PTR_ERR_OR_ZERO(rdev);
103	}
104
105	static const struct regmap_config sy8827n_regmap_config = {
106	.reg_bits = 8,
107	.val_bits = 8,
108	};
109
110	static int sy8827n_i2c_probe(struct i2c_client *client)
111	{
112	struct device *dev = &client->dev;
113	struct device_node *np = dev->of_node;
114	struct sy8827n_device_info *di;
115	struct regulator_config config = { };
116	struct regmap *regmap;
117	int ret;
118
119	di = devm_kzalloc(dev, sizeof(struct sy8827n_device_info), GFP_KERNEL);
120	if (!di)
121	return -ENOMEM;
122
123	di->regulator = of_get_regulator_init_data(dev, np, &di->desc);
124	if (!di->regulator) {
125	dev_err(dev, "Platform data not found!\n");
126	return -EINVAL;
127	}
128
129	di->en_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_HIGH);
130	if (IS_ERR(di->en_gpio))
131	return PTR_ERR(di->en_gpio);
132
133	if (of_property_read_bool(np, "silergy,vsel-state-high"))
134	di->vsel_reg = SY8827N_VSEL1;
135	else
136	di->vsel_reg = SY8827N_VSEL0;
137
138	di->dev = dev;
139
140	regmap = devm_regmap_init_i2c(client, &sy8827n_regmap_config);
141	if (IS_ERR(regmap)) {
142	dev_err(dev, "Failed to allocate regmap!\n");
143	return PTR_ERR(regmap);
144	}
145	i2c_set_clientdata(client, di);
146
147	config.dev = di->dev;
148	config.init_data = di->regulator;
149	config.regmap = regmap;
150	config.driver_data = di;
151	config.of_node = np;
152
153	ret = sy8827n_regulator_register(di, &config);
154	if (ret < 0)
155	dev_err(dev, "Failed to register regulator!\n");
156	return ret;
157	}
158
a16138a3	159	#ifdef CONFIG_OF
38fc6f29 JZ	160	static const struct of_device_id sy8827n_dt_ids[] = {
	161	{
	162	.compatible = "silergy,sy8827n",
	163	},
	164	{ }
	165	};
	166	MODULE_DEVICE_TABLE(of, sy8827n_dt_ids);
a16138a3	167	#endif
38fc6f29 JZ	168
	169	static const struct i2c_device_id sy8827n_id[] = {
	170	{ "sy8827n", },
	171	{ },
	172	};
	173	MODULE_DEVICE_TABLE(i2c, sy8827n_id);
	174
	175	static struct i2c_driver sy8827n_regulator_driver = {
	176	.driver = {
	177	.name = "sy8827n-regulator",
	178	.of_match_table = of_match_ptr(sy8827n_dt_ids),
	179	},
	180	.probe_new = sy8827n_i2c_probe,
	181	.id_table = sy8827n_id,
	182	};
	183	module_i2c_driver(sy8827n_regulator_driver);
	184
	185	MODULE_AUTHOR("Jisheng Zhang <jszhang@kernel.org>");
	186	MODULE_DESCRIPTION("SY8827N regulator driver");
	187	MODULE_LICENSE("GPL v2");