drivers/regulator/mp886x.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 //
 // MP8867/MP8869 regulator driver
 //
 // Copyright (C) 2020 Synaptics Incorporated
 //
 // Author: Jisheng Zhang <jszhang@kernel.org>

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

 #define MP886X_VSEL		0x00
 #define  MP886X_V_BOOT		(1 << 7)
 #define MP886X_SYSCNTLREG1	0x01
 #define  MP886X_MODE		(1 << 0)
 #define  MP886X_SLEW_SHIFT	3
 #define  MP886X_SLEW_MASK	(0x7 << MP886X_SLEW_SHIFT)
 #define  MP886X_GO		(1 << 6)
 #define  MP886X_EN		(1 << 7)
 #define MP8869_SYSCNTLREG2	0x02

 struct mp886x_cfg_info {
 	const struct regulator_ops *rops;
 	const unsigned int slew_rates[8];
 	const int switch_freq[4];
 	const u8 fs_reg;
 	const u8 fs_shift;
 };

 struct mp886x_device_info {
 	struct device *dev;
 	struct regulator_desc desc;
 	struct regulator_init_data *regulator;
 	struct gpio_desc *en_gpio;
 	const struct mp886x_cfg_info *ci;
 	u32 r[2];
 	unsigned int sel;
 };

 static void mp886x_set_switch_freq(struct mp886x_device_info *di,
 				   struct regmap *regmap,
 				   u32 freq)
 {
 	const struct mp886x_cfg_info *ci = di->ci;
 	int i;

 	for (i = 0; i < ARRAY_SIZE(ci->switch_freq); i++) {
 		if (freq == ci->switch_freq[i]) {
 			regmap_update_bits(regmap, ci->fs_reg,
 				  0x3 << ci->fs_shift, i << ci->fs_shift);
 			return;
 		}
 	}

 	dev_err(di->dev, "invalid frequency %d\n", freq);
 }

 static int mp886x_set_mode(struct regulator_dev *rdev, unsigned int mode)
 {
 	switch (mode) {
 	case REGULATOR_MODE_FAST:
 		regmap_update_bits(rdev->regmap, MP886X_SYSCNTLREG1,
 				   MP886X_MODE, MP886X_MODE);
 		break;
 	case REGULATOR_MODE_NORMAL:
 		regmap_update_bits(rdev->regmap, MP886X_SYSCNTLREG1,
 				   MP886X_MODE, 0);
 		break;
 	default:
 		return -EINVAL;
 	}
 	return 0;
 }

 static unsigned int mp886x_get_mode(struct regulator_dev *rdev)
 {
 	u32 val;
 	int ret;

 	ret = regmap_read(rdev->regmap, MP886X_SYSCNTLREG1, &val);
 	if (ret < 0)
 		return ret;
 	if (val & MP886X_MODE)
 		return REGULATOR_MODE_FAST;
 	else
 		return REGULATOR_MODE_NORMAL;
 }

 static int mp8869_set_voltage_sel(struct regulator_dev *rdev, unsigned int sel)
 {
 	int ret;

 	ret = regmap_update_bits(rdev->regmap, MP886X_SYSCNTLREG1,
 				 MP886X_GO, MP886X_GO);
 	if (ret < 0)
 		return ret;

 	sel <<= ffs(rdev->desc->vsel_mask) - 1;
 	return regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg,
 				  MP886X_V_BOOT | rdev->desc->vsel_mask, sel);
 }

 static inline unsigned int mp8869_scale(unsigned int uv, u32 r1, u32 r2)
 {
 	u32 tmp = uv * r1 / r2;

 	return uv + tmp;
 }

 static int mp8869_get_voltage_sel(struct regulator_dev *rdev)
 {
 	struct mp886x_device_info *di = rdev_get_drvdata(rdev);
 	int ret, uv;
 	unsigned int val;
 	bool fbloop;

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

 	fbloop = val & MP886X_V_BOOT;
 	if (fbloop) {
 		uv = rdev->desc->min_uV;
 		uv = mp8869_scale(uv, di->r[0], di->r[1]);
 		return regulator_map_voltage_linear(rdev, uv, uv);
 	}

 	val &= rdev->desc->vsel_mask;
 	val >>= ffs(rdev->desc->vsel_mask) - 1;

 	return val;
 }

 static const struct regulator_ops mp8869_regulator_ops = {
 	.set_voltage_sel = mp8869_set_voltage_sel,
 	.get_voltage_sel = mp8869_get_voltage_sel,
 	.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 = mp886x_set_mode,
 	.get_mode = mp886x_get_mode,
 	.set_ramp_delay = regulator_set_ramp_delay_regmap,
 };

 static const struct mp886x_cfg_info mp8869_ci = {
 	.rops = &mp8869_regulator_ops,
 	.slew_rates = {
 		40000,
 		30000,
 		20000,
 		10000,
 		5000,
 		2500,
 		1250,
 		625,
 	},
 	.switch_freq = {
 		500000,
 		750000,
 		1000000,
 		1250000,
 	},
 	.fs_reg = MP8869_SYSCNTLREG2,
 	.fs_shift = 4,
 };

 static int mp8867_set_voltage_sel(struct regulator_dev *rdev, unsigned int sel)
 {
 	struct mp886x_device_info *di = rdev_get_drvdata(rdev);
 	int ret, delta;

 	ret = mp8869_set_voltage_sel(rdev, sel);
 	if (ret < 0)
 		return ret;

 	delta = di->sel - sel;
 	if (abs(delta) <= 5)
 		ret = regmap_update_bits(rdev->regmap, MP886X_SYSCNTLREG1,
 					 MP886X_GO, 0);
 	di->sel = sel;

 	return ret;
 }

 static int mp8867_get_voltage_sel(struct regulator_dev *rdev)
 {
 	struct mp886x_device_info *di = rdev_get_drvdata(rdev);
 	int ret, uv;
 	unsigned int val;
 	bool fbloop;

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

 	fbloop = val & MP886X_V_BOOT;

 	val &= rdev->desc->vsel_mask;
 	val >>= ffs(rdev->desc->vsel_mask) - 1;

 	if (fbloop) {
 		uv = regulator_list_voltage_linear(rdev, val);
 		uv = mp8869_scale(uv, di->r[0], di->r[1]);
 		return regulator_map_voltage_linear(rdev, uv, uv);
 	}

 	return val;
 }

 static const struct regulator_ops mp8867_regulator_ops = {
 	.set_voltage_sel = mp8867_set_voltage_sel,
 	.get_voltage_sel = mp8867_get_voltage_sel,
 	.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 = mp886x_set_mode,
 	.get_mode = mp886x_get_mode,
 	.set_ramp_delay = regulator_set_ramp_delay_regmap,
 };

 static const struct mp886x_cfg_info mp8867_ci = {
 	.rops = &mp8867_regulator_ops,
 	.slew_rates = {
 		64000,
 		32000,
 		16000,
 		8000,
 		4000,
 		2000,
 		1000,
 		500,
 	},
 	.switch_freq = {
 		500000,
 		750000,
 		1000000,
 		1500000,
 	},
 	.fs_reg = MP886X_SYSCNTLREG1,
 	.fs_shift = 1,
 };

 static int mp886x_regulator_register(struct mp886x_device_info *di,
 				     struct regulator_config *config)
 {
 	struct regulator_desc *rdesc = &di->desc;
 	struct regulator_dev *rdev;

 	rdesc->name = "mp886x-reg";
 	rdesc->supply_name = "vin";
 	rdesc->ops = di->ci->rops;
 	rdesc->type = REGULATOR_VOLTAGE;
 	rdesc->n_voltages = 128;
 	rdesc->enable_reg = MP886X_SYSCNTLREG1;
 	rdesc->enable_mask = MP886X_EN;
 	rdesc->min_uV = 600000;
 	rdesc->uV_step = 10000;
 	rdesc->vsel_reg = MP886X_VSEL;
 	rdesc->vsel_mask = 0x3f;
 	rdesc->ramp_reg = MP886X_SYSCNTLREG1;
 	rdesc->ramp_mask = MP886X_SLEW_MASK;
 	rdesc->ramp_delay_table = di->ci->slew_rates;
 	rdesc->n_ramp_values = ARRAY_SIZE(di->ci->slew_rates);
 	rdesc->owner = THIS_MODULE;

 	rdev = devm_regulator_register(di->dev, &di->desc, config);
 	if (IS_ERR(rdev))
 		return PTR_ERR(rdev);
 	di->sel = rdesc->ops->get_voltage_sel(rdev);
 	return 0;
 }

 static const struct regmap_config mp886x_regmap_config = {
 	.reg_bits = 8,
 	.val_bits = 8,
 };

 static int mp886x_i2c_probe(struct i2c_client *client)
 {
 	struct device *dev = &client->dev;
 	struct device_node *np = dev->of_node;
 	struct mp886x_device_info *di;
 	struct regulator_config config = { };
 	struct regmap *regmap;
 	u32 freq;
 	int ret;

 	di = devm_kzalloc(dev, sizeof(struct mp886x_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;
 	}

 	ret = of_property_read_u32_array(np, "mps,fb-voltage-divider",
 					 di->r, 2);
 	if (ret)
 		return ret;

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

 	di->ci = i2c_get_match_data(client);
 	di->dev = dev;

 	regmap = devm_regmap_init_i2c(client, &mp886x_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;

 	if (!of_property_read_u32(np, "mps,switch-frequency-hz", &freq))
 		mp886x_set_switch_freq(di, regmap, freq);

 	ret = mp886x_regulator_register(di, &config);
 	if (ret < 0)
 		dev_err(dev, "Failed to register regulator!\n");
 	return ret;
 }

 static const struct of_device_id mp886x_dt_ids[] = {
 	{ .compatible = "mps,mp8867", .data = &mp8867_ci },
 	{ .compatible = "mps,mp8869", .data = &mp8869_ci },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, mp886x_dt_ids);

 static const struct i2c_device_id mp886x_id[] = {
 	{ "mp886x", (kernel_ulong_t)&mp8869_ci },
 	{ },
 };
 MODULE_DEVICE_TABLE(i2c, mp886x_id);

 static struct i2c_driver mp886x_regulator_driver = {
 	.driver = {
 		.name = "mp886x-regulator",
 		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
 		.of_match_table = mp886x_dt_ids,
 	},
 	.probe = mp886x_i2c_probe,
 	.id_table = mp886x_id,
 };
 module_i2c_driver(mp886x_regulator_driver);

 MODULE_AUTHOR("Jisheng Zhang <jszhang@kernel.org>");
 MODULE_DESCRIPTION("MP886x regulator driver");
 MODULE_LICENSE("GPL v2");
	// SPDX-License-Identifier: GPL-2.0
	//
	// MP8867/MP8869 regulator driver
	//
	// Copyright (C) 2020 Synaptics Incorporated
	//
	// Author: Jisheng Zhang <jszhang@kernel.org>

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

	#define MP886X_VSEL 0x00
	#define MP886X_V_BOOT (1 << 7)
	#define MP886X_SYSCNTLREG1 0x01
	#define MP886X_MODE (1 << 0)
	#define MP886X_SLEW_SHIFT 3
	#define MP886X_SLEW_MASK (0x7 << MP886X_SLEW_SHIFT)
	#define MP886X_GO (1 << 6)
	#define MP886X_EN (1 << 7)
	#define MP8869_SYSCNTLREG2 0x02

	struct mp886x_cfg_info {
	const struct regulator_ops *rops;
	const unsigned int slew_rates[8];
	const int switch_freq[4];
	const u8 fs_reg;
	const u8 fs_shift;
	};

	struct mp886x_device_info {
	struct device *dev;
	struct regulator_desc desc;
	struct regulator_init_data *regulator;
	struct gpio_desc *en_gpio;
	const struct mp886x_cfg_info *ci;
	u32 r[2];
	unsigned int sel;
	};

	static void mp886x_set_switch_freq(struct mp886x_device_info *di,
	struct regmap *regmap,
	u32 freq)
	{
	const struct mp886x_cfg_info *ci = di->ci;
	int i;

	for (i = 0; i < ARRAY_SIZE(ci->switch_freq); i++) {
	if (freq == ci->switch_freq[i]) {
	regmap_update_bits(regmap, ci->fs_reg,
	0x3 << ci->fs_shift, i << ci->fs_shift);
	return;
	}
	}

	dev_err(di->dev, "invalid frequency %d\n", freq);
	}

	static int mp886x_set_mode(struct regulator_dev *rdev, unsigned int mode)
	{
	switch (mode) {
	case REGULATOR_MODE_FAST:
	regmap_update_bits(rdev->regmap, MP886X_SYSCNTLREG1,
	MP886X_MODE, MP886X_MODE);
	break;
	case REGULATOR_MODE_NORMAL:
	regmap_update_bits(rdev->regmap, MP886X_SYSCNTLREG1,
	MP886X_MODE, 0);
	break;
	default:
	return -EINVAL;
	}
	return 0;
	}

	static unsigned int mp886x_get_mode(struct regulator_dev *rdev)
	{
	u32 val;
	int ret;

	ret = regmap_read(rdev->regmap, MP886X_SYSCNTLREG1, &val);
	if (ret < 0)
	return ret;
	if (val & MP886X_MODE)
	return REGULATOR_MODE_FAST;
	else
	return REGULATOR_MODE_NORMAL;
	}

	static int mp8869_set_voltage_sel(struct regulator_dev *rdev, unsigned int sel)
	{
	int ret;

	ret = regmap_update_bits(rdev->regmap, MP886X_SYSCNTLREG1,
	MP886X_GO, MP886X_GO);
	if (ret < 0)
	return ret;

	sel <<= ffs(rdev->desc->vsel_mask) - 1;
	return regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg,
	MP886X_V_BOOT \| rdev->desc->vsel_mask, sel);
	}

	static inline unsigned int mp8869_scale(unsigned int uv, u32 r1, u32 r2)
	{
	u32 tmp = uv * r1 / r2;

	return uv + tmp;
	}

	static int mp8869_get_voltage_sel(struct regulator_dev *rdev)
	{
	struct mp886x_device_info *di = rdev_get_drvdata(rdev);
	int ret, uv;
	unsigned int val;
	bool fbloop;

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

	fbloop = val & MP886X_V_BOOT;
	if (fbloop) {
	uv = rdev->desc->min_uV;
	uv = mp8869_scale(uv, di->r[0], di->r[1]);
	return regulator_map_voltage_linear(rdev, uv, uv);
	}

	val &= rdev->desc->vsel_mask;
	val >>= ffs(rdev->desc->vsel_mask) - 1;

	return val;
	}

	static const struct regulator_ops mp8869_regulator_ops = {
	.set_voltage_sel = mp8869_set_voltage_sel,
	.get_voltage_sel = mp8869_get_voltage_sel,
	.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 = mp886x_set_mode,
	.get_mode = mp886x_get_mode,
	.set_ramp_delay = regulator_set_ramp_delay_regmap,
	};

	static const struct mp886x_cfg_info mp8869_ci = {
	.rops = &mp8869_regulator_ops,
	.slew_rates = {
	40000,
	30000,
	20000,
	10000,
	5000,
	2500,
	1250,
	625,
	},
	.switch_freq = {
	500000,
	750000,
	1000000,
	1250000,
	},
	.fs_reg = MP8869_SYSCNTLREG2,
	.fs_shift = 4,
	};

	static int mp8867_set_voltage_sel(struct regulator_dev *rdev, unsigned int sel)
	{
	struct mp886x_device_info *di = rdev_get_drvdata(rdev);
	int ret, delta;

	ret = mp8869_set_voltage_sel(rdev, sel);
	if (ret < 0)
	return ret;

	delta = di->sel - sel;
	if (abs(delta) <= 5)
	ret = regmap_update_bits(rdev->regmap, MP886X_SYSCNTLREG1,
	MP886X_GO, 0);
	di->sel = sel;

	return ret;
	}

	static int mp8867_get_voltage_sel(struct regulator_dev *rdev)
	{
	struct mp886x_device_info *di = rdev_get_drvdata(rdev);
	int ret, uv;
	unsigned int val;
	bool fbloop;

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

	fbloop = val & MP886X_V_BOOT;

	val &= rdev->desc->vsel_mask;
	val >>= ffs(rdev->desc->vsel_mask) - 1;

	if (fbloop) {
	uv = regulator_list_voltage_linear(rdev, val);
	uv = mp8869_scale(uv, di->r[0], di->r[1]);
	return regulator_map_voltage_linear(rdev, uv, uv);
	}

	return val;
	}

	static const struct regulator_ops mp8867_regulator_ops = {
	.set_voltage_sel = mp8867_set_voltage_sel,
	.get_voltage_sel = mp8867_get_voltage_sel,
	.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 = mp886x_set_mode,
	.get_mode = mp886x_get_mode,
	.set_ramp_delay = regulator_set_ramp_delay_regmap,
	};

	static const struct mp886x_cfg_info mp8867_ci = {
	.rops = &mp8867_regulator_ops,
	.slew_rates = {
	64000,
	32000,
	16000,
	8000,
	4000,
	2000,
	1000,
	500,
	},
	.switch_freq = {
	500000,
	750000,
	1000000,
	1500000,
	},
	.fs_reg = MP886X_SYSCNTLREG1,
	.fs_shift = 1,
	};

	static int mp886x_regulator_register(struct mp886x_device_info *di,
	struct regulator_config *config)
	{
	struct regulator_desc *rdesc = &di->desc;
	struct regulator_dev *rdev;

	rdesc->name = "mp886x-reg";
	rdesc->supply_name = "vin";
	rdesc->ops = di->ci->rops;
	rdesc->type = REGULATOR_VOLTAGE;
	rdesc->n_voltages = 128;
	rdesc->enable_reg = MP886X_SYSCNTLREG1;
	rdesc->enable_mask = MP886X_EN;
	rdesc->min_uV = 600000;
	rdesc->uV_step = 10000;
	rdesc->vsel_reg = MP886X_VSEL;
	rdesc->vsel_mask = 0x3f;
	rdesc->ramp_reg = MP886X_SYSCNTLREG1;
	rdesc->ramp_mask = MP886X_SLEW_MASK;
	rdesc->ramp_delay_table = di->ci->slew_rates;
	rdesc->n_ramp_values = ARRAY_SIZE(di->ci->slew_rates);
	rdesc->owner = THIS_MODULE;

	rdev = devm_regulator_register(di->dev, &di->desc, config);
	if (IS_ERR(rdev))
	return PTR_ERR(rdev);
	di->sel = rdesc->ops->get_voltage_sel(rdev);
	return 0;
	}

	static const struct regmap_config mp886x_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	};

	static int mp886x_i2c_probe(struct i2c_client *client)
	{
	struct device *dev = &client->dev;
	struct device_node *np = dev->of_node;
	struct mp886x_device_info *di;
	struct regulator_config config = { };
	struct regmap *regmap;
	u32 freq;
	int ret;

	di = devm_kzalloc(dev, sizeof(struct mp886x_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;
	}

	ret = of_property_read_u32_array(np, "mps,fb-voltage-divider",
	di->r, 2);
	if (ret)
	return ret;

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

	di->ci = i2c_get_match_data(client);
	di->dev = dev;

	regmap = devm_regmap_init_i2c(client, &mp886x_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;

	if (!of_property_read_u32(np, "mps,switch-frequency-hz", &freq))
	mp886x_set_switch_freq(di, regmap, freq);

	ret = mp886x_regulator_register(di, &config);
	if (ret < 0)
	dev_err(dev, "Failed to register regulator!\n");
	return ret;
	}

	static const struct of_device_id mp886x_dt_ids[] = {
	{ .compatible = "mps,mp8867", .data = &mp8867_ci },
	{ .compatible = "mps,mp8869", .data = &mp8869_ci },
	{ }
	};
	MODULE_DEVICE_TABLE(of, mp886x_dt_ids);

	static const struct i2c_device_id mp886x_id[] = {
	{ "mp886x", (kernel_ulong_t)&mp8869_ci },
	{ },
	};
	MODULE_DEVICE_TABLE(i2c, mp886x_id);

	static struct i2c_driver mp886x_regulator_driver = {
	.driver = {
	.name = "mp886x-regulator",
	.probe_type = PROBE_PREFER_ASYNCHRONOUS,
	.of_match_table = mp886x_dt_ids,
	},
	.probe = mp886x_i2c_probe,
	.id_table = mp886x_id,
	};
	module_i2c_driver(mp886x_regulator_driver);

	MODULE_AUTHOR("Jisheng Zhang <jszhang@kernel.org>");
	MODULE_DESCRIPTION("MP886x regulator driver");
	MODULE_LICENSE("GPL v2");