drivers/regulator/fan53555.c - arm/linux-arm64-legacy - Git at Google

 /*
  * 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/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 */

 /* 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,
 };

 struct fan53555_device_info {
 	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_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 struct regulator_ops fan53555_regulator_ops = {
 	.set_voltage_sel = regulator_set_voltage_sel_regmap,
 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
 	.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,
 };

 /* 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)
 {
 	unsigned int reg, data, mask;

 	/* 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;
 	}
 	/* Init voltage range and step */
 	switch (di->chip_id) {
 	case FAN53555_CHIP_ID_00:
 	case FAN53555_CHIP_ID_01:
 	case FAN53555_CHIP_ID_03:
 	case FAN53555_CHIP_ID_05:
 		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]\n not supported!\n", di->chip_id);
 		return -EINVAL;
 	}
 	/* Init slew rate */
 	if (pdata->slew_rate & 0x7)
 		di->slew_rate = pdata->slew_rate;
 	else
 		di->slew_rate = FAN53555_SLEW_RATE_64MV;
 	reg = FAN53555_CONTROL;
 	data = di->slew_rate << CTL_SLEW_SHIFT;
 	mask = CTL_SLEW_MASK;
 	return regmap_update_bits(di->regmap, reg, mask, data);
 }

 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->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 struct regmap_config fan53555_regmap_config = {
 	.reg_bits = 8,
 	.val_bits = 8,
 };

 static int fan53555_regulator_probe(struct i2c_client *client,
 				const struct i2c_device_id *id)
 {
 	struct fan53555_device_info *di;
 	struct fan53555_platform_data *pdata;
 	struct regulator_config config = { };
 	unsigned int val;
 	int ret;

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

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

 	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;
 	di->regulator = pdata->regulator;
 	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;
 	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[] = {
 	{"fan53555", -1},
 	{ },
 };

 static struct i2c_driver fan53555_regulator_driver = {
 	.driver = {
 		.name = "fan53555-regulator",
 	},
 	.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");
	/*
	* 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/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 */

	/* 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,
	};

	struct fan53555_device_info {
	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_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 struct regulator_ops fan53555_regulator_ops = {
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.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,
	};

	/* 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)
	{
	unsigned int reg, data, mask;

	/* 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;
	}
	/* Init voltage range and step */
	switch (di->chip_id) {
	case FAN53555_CHIP_ID_00:
	case FAN53555_CHIP_ID_01:
	case FAN53555_CHIP_ID_03:
	case FAN53555_CHIP_ID_05:
	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]\n not supported!\n", di->chip_id);
	return -EINVAL;
	}
	/* Init slew rate */
	if (pdata->slew_rate & 0x7)
	di->slew_rate = pdata->slew_rate;
	else
	di->slew_rate = FAN53555_SLEW_RATE_64MV;
	reg = FAN53555_CONTROL;
	data = di->slew_rate << CTL_SLEW_SHIFT;
	mask = CTL_SLEW_MASK;
	return regmap_update_bits(di->regmap, reg, mask, data);
	}

	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->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 struct regmap_config fan53555_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	};

	static int fan53555_regulator_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	struct fan53555_device_info *di;
	struct fan53555_platform_data *pdata;
	struct regulator_config config = { };
	unsigned int val;
	int ret;

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

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

	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;
	di->regulator = pdata->regulator;
	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;
	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[] = {
	{"fan53555", -1},
	{ },
	};

	static struct i2c_driver fan53555_regulator_driver = {
	.driver = {
	.name = "fan53555-regulator",
	},
	.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");