drivers/regulator/rtq6752-regulator.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0+

 #include <linux/bitops.h>
 #include <linux/delay.h>
 #include <linux/gpio/consumer.h>
 #include <linux/i2c.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/mutex.h>
 #include <linux/regmap.h>
 #include <linux/regulator/driver.h>

 enum {
 	RTQ6752_IDX_PAVDD = 0,
 	RTQ6752_IDX_NAVDD = 1,
 	RTQ6752_IDX_MAX
 };

 #define RTQ6752_REG_PAVDD	0x00
 #define RTQ6752_REG_NAVDD	0x01
 #define RTQ6752_REG_PAVDDONDLY	0x07
 #define RTQ6752_REG_PAVDDSSTIME	0x08
 #define RTQ6752_REG_NAVDDONDLY	0x0D
 #define RTQ6752_REG_NAVDDSSTIME	0x0E
 #define RTQ6752_REG_OPTION1	0x12
 #define RTQ6752_REG_CHSWITCH	0x16
 #define RTQ6752_REG_FAULT	0x1D

 #define RTQ6752_VOUT_MASK	GENMASK(5, 0)
 #define RTQ6752_NAVDDEN_MASK	BIT(3)
 #define RTQ6752_PAVDDEN_MASK	BIT(0)
 #define RTQ6752_PAVDDAD_MASK	BIT(4)
 #define RTQ6752_NAVDDAD_MASK	BIT(3)
 #define RTQ6752_PAVDDF_MASK	BIT(3)
 #define RTQ6752_NAVDDF_MASK	BIT(0)
 #define RTQ6752_ENABLE_MASK	(BIT(RTQ6752_IDX_MAX) - 1)

 #define RTQ6752_VOUT_MINUV	5000000
 #define RTQ6752_VOUT_STEPUV	50000
 #define RTQ6752_VOUT_NUM	47
 #define RTQ6752_I2CRDY_TIMEUS	1000
 #define RTQ6752_MINSS_TIMEUS	5000

 struct rtq6752_priv {
 	struct regmap *regmap;
 	struct gpio_desc *enable_gpio;
 	struct mutex lock;
 	unsigned char enable_flag;
 };

 static int rtq6752_set_vdd_enable(struct regulator_dev *rdev)
 {
 	struct rtq6752_priv *priv = rdev_get_drvdata(rdev);
 	int rid = rdev_get_id(rdev), ret;

 	mutex_lock(&priv->lock);
 	if (!priv->enable_flag) {
 		if (priv->enable_gpio) {
 			gpiod_set_value(priv->enable_gpio, 1);

 			usleep_range(RTQ6752_I2CRDY_TIMEUS,
 				     RTQ6752_I2CRDY_TIMEUS + 100);
 		}

 		regcache_cache_only(priv->regmap, false);
 		ret = regcache_sync(priv->regmap);
 		if (ret) {
 			mutex_unlock(&priv->lock);
 			return ret;
 		}
 	}

 	priv->enable_flag |= BIT(rid);
 	mutex_unlock(&priv->lock);

 	return regulator_enable_regmap(rdev);
 }

 static int rtq6752_set_vdd_disable(struct regulator_dev *rdev)
 {
 	struct rtq6752_priv *priv = rdev_get_drvdata(rdev);
 	int rid = rdev_get_id(rdev), ret;

 	ret = regulator_disable_regmap(rdev);
 	if (ret)
 		return ret;

 	mutex_lock(&priv->lock);
 	priv->enable_flag &= ~BIT(rid);

 	if (!priv->enable_flag) {
 		regcache_cache_only(priv->regmap, true);
 		regcache_mark_dirty(priv->regmap);

 		if (priv->enable_gpio)
 			gpiod_set_value(priv->enable_gpio, 0);

 	}
 	mutex_unlock(&priv->lock);

 	return 0;
 }

 static int rtq6752_get_error_flags(struct regulator_dev *rdev,
 				   unsigned int *flags)
 {
 	unsigned int val, events = 0;
 	const unsigned int fault_mask[] = {
 		RTQ6752_PAVDDF_MASK, RTQ6752_NAVDDF_MASK };
 	int rid = rdev_get_id(rdev), ret;

 	ret = regmap_read(rdev->regmap, RTQ6752_REG_FAULT, &val);
 	if (ret)
 		return ret;

 	if (val & fault_mask[rid])
 		events = REGULATOR_ERROR_REGULATION_OUT;

 	*flags = events;
 	return 0;
 }

 static const struct regulator_ops rtq6752_regulator_ops = {
 	.list_voltage = regulator_list_voltage_linear,
 	.set_voltage_sel = regulator_set_voltage_sel_regmap,
 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
 	.enable = rtq6752_set_vdd_enable,
 	.disable = rtq6752_set_vdd_disable,
 	.is_enabled = regulator_is_enabled_regmap,
 	.set_active_discharge = regulator_set_active_discharge_regmap,
 	.get_error_flags = rtq6752_get_error_flags,
 };

 static const struct regulator_desc rtq6752_regulator_descs[] = {
 	{
 		.name = "rtq6752-pavdd",
 		.of_match = of_match_ptr("pavdd"),
 		.regulators_node = of_match_ptr("regulators"),
 		.id = RTQ6752_IDX_PAVDD,
 		.n_voltages = RTQ6752_VOUT_NUM,
 		.ops = &rtq6752_regulator_ops,
 		.owner = THIS_MODULE,
 		.min_uV = RTQ6752_VOUT_MINUV,
 		.uV_step = RTQ6752_VOUT_STEPUV,
 		.enable_time = RTQ6752_MINSS_TIMEUS,
 		.vsel_reg = RTQ6752_REG_PAVDD,
 		.vsel_mask = RTQ6752_VOUT_MASK,
 		.enable_reg = RTQ6752_REG_CHSWITCH,
 		.enable_mask = RTQ6752_PAVDDEN_MASK,
 		.active_discharge_reg = RTQ6752_REG_OPTION1,
 		.active_discharge_mask = RTQ6752_PAVDDAD_MASK,
 		.active_discharge_off = RTQ6752_PAVDDAD_MASK,
 	},
 	{
 		.name = "rtq6752-navdd",
 		.of_match = of_match_ptr("navdd"),
 		.regulators_node = of_match_ptr("regulators"),
 		.id = RTQ6752_IDX_NAVDD,
 		.n_voltages = RTQ6752_VOUT_NUM,
 		.ops = &rtq6752_regulator_ops,
 		.owner = THIS_MODULE,
 		.min_uV = RTQ6752_VOUT_MINUV,
 		.uV_step = RTQ6752_VOUT_STEPUV,
 		.enable_time = RTQ6752_MINSS_TIMEUS,
 		.vsel_reg = RTQ6752_REG_NAVDD,
 		.vsel_mask = RTQ6752_VOUT_MASK,
 		.enable_reg = RTQ6752_REG_CHSWITCH,
 		.enable_mask = RTQ6752_NAVDDEN_MASK,
 		.active_discharge_reg = RTQ6752_REG_OPTION1,
 		.active_discharge_mask = RTQ6752_NAVDDAD_MASK,
 		.active_discharge_off = RTQ6752_NAVDDAD_MASK,
 	}
 };

 static int rtq6752_init_device_properties(struct rtq6752_priv *priv)
 {
 	u8 raw_vals[] = { 0, 0 };
 	int ret;

 	/* Configure PAVDD on and softstart delay time to the minimum */
 	ret = regmap_raw_write(priv->regmap, RTQ6752_REG_PAVDDONDLY, raw_vals,
 			       ARRAY_SIZE(raw_vals));
 	if (ret)
 		return ret;

 	/* Configure NAVDD on and softstart delay time to the minimum */
 	return regmap_raw_write(priv->regmap, RTQ6752_REG_NAVDDONDLY, raw_vals,
 				ARRAY_SIZE(raw_vals));
 }

 static bool rtq6752_is_volatile_reg(struct device *dev, unsigned int reg)
 {
 	if (reg == RTQ6752_REG_FAULT)
 		return true;
 	return false;
 }

 static const struct reg_default rtq6752_reg_defaults[] = {
 	{ RTQ6752_REG_PAVDD, 0x14 },
 	{ RTQ6752_REG_NAVDD, 0x14 },
 	{ RTQ6752_REG_PAVDDONDLY, 0x01 },
 	{ RTQ6752_REG_PAVDDSSTIME, 0x01 },
 	{ RTQ6752_REG_NAVDDONDLY, 0x01 },
 	{ RTQ6752_REG_NAVDDSSTIME, 0x01 },
 	{ RTQ6752_REG_OPTION1, 0x07 },
 	{ RTQ6752_REG_CHSWITCH, 0x29 },
 };

 static const struct regmap_config rtq6752_regmap_config = {
 	.reg_bits = 8,
 	.val_bits = 8,
 	.cache_type = REGCACHE_RBTREE,
 	.max_register = RTQ6752_REG_FAULT,
 	.reg_defaults = rtq6752_reg_defaults,
 	.num_reg_defaults = ARRAY_SIZE(rtq6752_reg_defaults),
 	.volatile_reg = rtq6752_is_volatile_reg,
 };

 static int rtq6752_probe(struct i2c_client *i2c)
 {
 	struct rtq6752_priv *priv;
 	struct regulator_config reg_cfg = {};
 	struct regulator_dev *rdev;
 	int i, ret;

 	priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;

 	mutex_init(&priv->lock);

 	priv->enable_gpio = devm_gpiod_get_optional(&i2c->dev, "enable",
 						    GPIOD_OUT_HIGH);
 	if (IS_ERR(priv->enable_gpio)) {
 		dev_err(&i2c->dev, "Failed to get 'enable' gpio\n");
 		return PTR_ERR(priv->enable_gpio);
 	}

 	usleep_range(RTQ6752_I2CRDY_TIMEUS, RTQ6752_I2CRDY_TIMEUS + 100);
 	/* Default EN pin to high, PAVDD and NAVDD will be on */
 	priv->enable_flag = RTQ6752_ENABLE_MASK;

 	priv->regmap = devm_regmap_init_i2c(i2c, &rtq6752_regmap_config);
 	if (IS_ERR(priv->regmap)) {
 		dev_err(&i2c->dev, "Failed to init regmap\n");
 		return PTR_ERR(priv->regmap);
 	}

 	ret = rtq6752_init_device_properties(priv);
 	if (ret) {
 		dev_err(&i2c->dev, "Failed to init device properties\n");
 		return ret;
 	}

 	reg_cfg.dev = &i2c->dev;
 	reg_cfg.regmap = priv->regmap;
 	reg_cfg.driver_data = priv;

 	for (i = 0; i < ARRAY_SIZE(rtq6752_regulator_descs); i++) {
 		rdev = devm_regulator_register(&i2c->dev,
 					       rtq6752_regulator_descs + i,
 					       &reg_cfg);
 		if (IS_ERR(rdev)) {
 			dev_err(&i2c->dev, "Failed to init %d regulator\n", i);
 			return PTR_ERR(rdev);
 		}
 	}

 	return 0;
 }

 static const struct of_device_id __maybe_unused rtq6752_device_table[] = {
 	{ .compatible = "richtek,rtq6752", },
 	{}
 };
 MODULE_DEVICE_TABLE(of, rtq6752_device_table);

 static struct i2c_driver rtq6752_driver = {
 	.driver = {
 		.name = "rtq6752",
 		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
 		.of_match_table = rtq6752_device_table,
 	},
 	.probe_new = rtq6752_probe,
 };
 module_i2c_driver(rtq6752_driver);

 MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
 MODULE_DESCRIPTION("Richtek RTQ6752 Regulator Driver");
 MODULE_LICENSE("GPL v2");
	// SPDX-License-Identifier: GPL-2.0+

	#include <linux/bitops.h>
	#include <linux/delay.h>
	#include <linux/gpio/consumer.h>
	#include <linux/i2c.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/mutex.h>
	#include <linux/regmap.h>
	#include <linux/regulator/driver.h>

	enum {
	RTQ6752_IDX_PAVDD = 0,
	RTQ6752_IDX_NAVDD = 1,
	RTQ6752_IDX_MAX
	};

	#define RTQ6752_REG_PAVDD 0x00
	#define RTQ6752_REG_NAVDD 0x01
	#define RTQ6752_REG_PAVDDONDLY 0x07
	#define RTQ6752_REG_PAVDDSSTIME 0x08
	#define RTQ6752_REG_NAVDDONDLY 0x0D
	#define RTQ6752_REG_NAVDDSSTIME 0x0E
	#define RTQ6752_REG_OPTION1 0x12
	#define RTQ6752_REG_CHSWITCH 0x16
	#define RTQ6752_REG_FAULT 0x1D

	#define RTQ6752_VOUT_MASK GENMASK(5, 0)
	#define RTQ6752_NAVDDEN_MASK BIT(3)
	#define RTQ6752_PAVDDEN_MASK BIT(0)
	#define RTQ6752_PAVDDAD_MASK BIT(4)
	#define RTQ6752_NAVDDAD_MASK BIT(3)
	#define RTQ6752_PAVDDF_MASK BIT(3)
	#define RTQ6752_NAVDDF_MASK BIT(0)
	#define RTQ6752_ENABLE_MASK (BIT(RTQ6752_IDX_MAX) - 1)

	#define RTQ6752_VOUT_MINUV 5000000
	#define RTQ6752_VOUT_STEPUV 50000
	#define RTQ6752_VOUT_NUM 47
	#define RTQ6752_I2CRDY_TIMEUS 1000
	#define RTQ6752_MINSS_TIMEUS 5000

	struct rtq6752_priv {
	struct regmap *regmap;
	struct gpio_desc *enable_gpio;
	struct mutex lock;
	unsigned char enable_flag;
	};

	static int rtq6752_set_vdd_enable(struct regulator_dev *rdev)
	{
	struct rtq6752_priv *priv = rdev_get_drvdata(rdev);
	int rid = rdev_get_id(rdev), ret;

	mutex_lock(&priv->lock);
	if (!priv->enable_flag) {
	if (priv->enable_gpio) {
	gpiod_set_value(priv->enable_gpio, 1);

	usleep_range(RTQ6752_I2CRDY_TIMEUS,
	RTQ6752_I2CRDY_TIMEUS + 100);
	}

	regcache_cache_only(priv->regmap, false);
	ret = regcache_sync(priv->regmap);
	if (ret) {
	mutex_unlock(&priv->lock);
	return ret;
	}
	}

	priv->enable_flag \|= BIT(rid);
	mutex_unlock(&priv->lock);

	return regulator_enable_regmap(rdev);
	}

	static int rtq6752_set_vdd_disable(struct regulator_dev *rdev)
	{
	struct rtq6752_priv *priv = rdev_get_drvdata(rdev);
	int rid = rdev_get_id(rdev), ret;

	ret = regulator_disable_regmap(rdev);
	if (ret)
	return ret;

	mutex_lock(&priv->lock);
	priv->enable_flag &= ~BIT(rid);

	if (!priv->enable_flag) {
	regcache_cache_only(priv->regmap, true);
	regcache_mark_dirty(priv->regmap);

	if (priv->enable_gpio)
	gpiod_set_value(priv->enable_gpio, 0);

	}
	mutex_unlock(&priv->lock);

	return 0;
	}

	static int rtq6752_get_error_flags(struct regulator_dev *rdev,
	unsigned int *flags)
	{
	unsigned int val, events = 0;
	const unsigned int fault_mask[] = {
	RTQ6752_PAVDDF_MASK, RTQ6752_NAVDDF_MASK };
	int rid = rdev_get_id(rdev), ret;

	ret = regmap_read(rdev->regmap, RTQ6752_REG_FAULT, &val);
	if (ret)
	return ret;

	if (val & fault_mask[rid])
	events = REGULATOR_ERROR_REGULATION_OUT;

	*flags = events;
	return 0;
	}

	static const struct regulator_ops rtq6752_regulator_ops = {
	.list_voltage = regulator_list_voltage_linear,
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.enable = rtq6752_set_vdd_enable,
	.disable = rtq6752_set_vdd_disable,
	.is_enabled = regulator_is_enabled_regmap,
	.set_active_discharge = regulator_set_active_discharge_regmap,
	.get_error_flags = rtq6752_get_error_flags,
	};

	static const struct regulator_desc rtq6752_regulator_descs[] = {
	{
	.name = "rtq6752-pavdd",
	.of_match = of_match_ptr("pavdd"),
	.regulators_node = of_match_ptr("regulators"),
	.id = RTQ6752_IDX_PAVDD,
	.n_voltages = RTQ6752_VOUT_NUM,
	.ops = &rtq6752_regulator_ops,
	.owner = THIS_MODULE,
	.min_uV = RTQ6752_VOUT_MINUV,
	.uV_step = RTQ6752_VOUT_STEPUV,
	.enable_time = RTQ6752_MINSS_TIMEUS,
	.vsel_reg = RTQ6752_REG_PAVDD,
	.vsel_mask = RTQ6752_VOUT_MASK,
	.enable_reg = RTQ6752_REG_CHSWITCH,
	.enable_mask = RTQ6752_PAVDDEN_MASK,
	.active_discharge_reg = RTQ6752_REG_OPTION1,
	.active_discharge_mask = RTQ6752_PAVDDAD_MASK,
	.active_discharge_off = RTQ6752_PAVDDAD_MASK,
	},
	{
	.name = "rtq6752-navdd",
	.of_match = of_match_ptr("navdd"),
	.regulators_node = of_match_ptr("regulators"),
	.id = RTQ6752_IDX_NAVDD,
	.n_voltages = RTQ6752_VOUT_NUM,
	.ops = &rtq6752_regulator_ops,
	.owner = THIS_MODULE,
	.min_uV = RTQ6752_VOUT_MINUV,
	.uV_step = RTQ6752_VOUT_STEPUV,
	.enable_time = RTQ6752_MINSS_TIMEUS,
	.vsel_reg = RTQ6752_REG_NAVDD,
	.vsel_mask = RTQ6752_VOUT_MASK,
	.enable_reg = RTQ6752_REG_CHSWITCH,
	.enable_mask = RTQ6752_NAVDDEN_MASK,
	.active_discharge_reg = RTQ6752_REG_OPTION1,
	.active_discharge_mask = RTQ6752_NAVDDAD_MASK,
	.active_discharge_off = RTQ6752_NAVDDAD_MASK,
	}
	};

	static int rtq6752_init_device_properties(struct rtq6752_priv *priv)
	{
	u8 raw_vals[] = { 0, 0 };
	int ret;

	/* Configure PAVDD on and softstart delay time to the minimum */
	ret = regmap_raw_write(priv->regmap, RTQ6752_REG_PAVDDONDLY, raw_vals,
	ARRAY_SIZE(raw_vals));
	if (ret)
	return ret;

	/* Configure NAVDD on and softstart delay time to the minimum */
	return regmap_raw_write(priv->regmap, RTQ6752_REG_NAVDDONDLY, raw_vals,
	ARRAY_SIZE(raw_vals));
	}

	static bool rtq6752_is_volatile_reg(struct device *dev, unsigned int reg)
	{
	if (reg == RTQ6752_REG_FAULT)
	return true;
	return false;
	}

	static const struct reg_default rtq6752_reg_defaults[] = {
	{ RTQ6752_REG_PAVDD, 0x14 },
	{ RTQ6752_REG_NAVDD, 0x14 },
	{ RTQ6752_REG_PAVDDONDLY, 0x01 },
	{ RTQ6752_REG_PAVDDSSTIME, 0x01 },
	{ RTQ6752_REG_NAVDDONDLY, 0x01 },
	{ RTQ6752_REG_NAVDDSSTIME, 0x01 },
	{ RTQ6752_REG_OPTION1, 0x07 },
	{ RTQ6752_REG_CHSWITCH, 0x29 },
	};

	static const struct regmap_config rtq6752_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.cache_type = REGCACHE_RBTREE,
	.max_register = RTQ6752_REG_FAULT,
	.reg_defaults = rtq6752_reg_defaults,
	.num_reg_defaults = ARRAY_SIZE(rtq6752_reg_defaults),
	.volatile_reg = rtq6752_is_volatile_reg,
	};

	static int rtq6752_probe(struct i2c_client *i2c)
	{
	struct rtq6752_priv *priv;
	struct regulator_config reg_cfg = {};
	struct regulator_dev *rdev;
	int i, ret;

	priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
	return -ENOMEM;

	mutex_init(&priv->lock);

	priv->enable_gpio = devm_gpiod_get_optional(&i2c->dev, "enable",
	GPIOD_OUT_HIGH);
	if (IS_ERR(priv->enable_gpio)) {
	dev_err(&i2c->dev, "Failed to get 'enable' gpio\n");
	return PTR_ERR(priv->enable_gpio);
	}

	usleep_range(RTQ6752_I2CRDY_TIMEUS, RTQ6752_I2CRDY_TIMEUS + 100);
	/* Default EN pin to high, PAVDD and NAVDD will be on */
	priv->enable_flag = RTQ6752_ENABLE_MASK;

	priv->regmap = devm_regmap_init_i2c(i2c, &rtq6752_regmap_config);
	if (IS_ERR(priv->regmap)) {
	dev_err(&i2c->dev, "Failed to init regmap\n");
	return PTR_ERR(priv->regmap);
	}

	ret = rtq6752_init_device_properties(priv);
	if (ret) {
	dev_err(&i2c->dev, "Failed to init device properties\n");
	return ret;
	}

	reg_cfg.dev = &i2c->dev;
	reg_cfg.regmap = priv->regmap;
	reg_cfg.driver_data = priv;

	for (i = 0; i < ARRAY_SIZE(rtq6752_regulator_descs); i++) {
	rdev = devm_regulator_register(&i2c->dev,
	rtq6752_regulator_descs + i,
	&reg_cfg);
	if (IS_ERR(rdev)) {
	dev_err(&i2c->dev, "Failed to init %d regulator\n", i);
	return PTR_ERR(rdev);
	}
	}

	return 0;
	}

	static const struct of_device_id __maybe_unused rtq6752_device_table[] = {
	{ .compatible = "richtek,rtq6752", },
	{}
	};
	MODULE_DEVICE_TABLE(of, rtq6752_device_table);

	static struct i2c_driver rtq6752_driver = {
	.driver = {
	.name = "rtq6752",
	.probe_type = PROBE_PREFER_ASYNCHRONOUS,
	.of_match_table = rtq6752_device_table,
	},
	.probe_new = rtq6752_probe,
	};
	module_i2c_driver(rtq6752_driver);

	MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
	MODULE_DESCRIPTION("Richtek RTQ6752 Regulator Driver");
	MODULE_LICENSE("GPL v2");