drivers/regulator/max14577.c - arm/linux-arm-legacy - Git at Google

 /*
  * max14577.c - Regulator driver for the Maxim 14577
  *
  * Copyright (C) 2013 Samsung Electronics
  * Krzysztof Kozlowski <k.kozlowski@samsung.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  */

 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/regulator/driver.h>
 #include <linux/mfd/max14577.h>
 #include <linux/mfd/max14577-private.h>
 #include <linux/regulator/of_regulator.h>

 struct max14577_regulator {
 	struct device *dev;
 	struct max14577 *max14577;
 	struct regulator_dev **regulators;
 };

 static int max14577_reg_is_enabled(struct regulator_dev *rdev)
 {
 	int rid = rdev_get_id(rdev);
 	struct regmap *rmap = rdev->regmap;
 	u8 reg_data;

 	switch (rid) {
 	case MAX14577_CHARGER:
 		max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL2, &reg_data);
 		if ((reg_data & CHGCTRL2_MBCHOSTEN_MASK) == 0)
 			return 0;
 		max14577_read_reg(rmap, MAX14577_CHG_REG_STATUS3, &reg_data);
 		if ((reg_data & STATUS3_CGMBC_MASK) == 0)
 			return 0;
 		/* MBCHOSTEN and CGMBC are on */
 		return 1;
 	default:
 		return -EINVAL;
 	}
 }

 static int max14577_reg_get_current_limit(struct regulator_dev *rdev)
 {
 	u8 reg_data;
 	struct regmap *rmap = rdev->regmap;

 	if (rdev_get_id(rdev) != MAX14577_CHARGER)
 		return -EINVAL;

 	max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL4, &reg_data);

 	if ((reg_data & CHGCTRL4_MBCICHWRCL_MASK) == 0)
 		return MAX14577_REGULATOR_CURRENT_LIMIT_MIN;

 	reg_data = ((reg_data & CHGCTRL4_MBCICHWRCH_MASK) >>
 			CHGCTRL4_MBCICHWRCH_SHIFT);
 	return MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_START +
 		reg_data * MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_STEP;
 }

 static int max14577_reg_set_current_limit(struct regulator_dev *rdev,
 		int min_uA, int max_uA)
 {
 	int i, current_bits = 0xf;
 	u8 reg_data;

 	if (rdev_get_id(rdev) != MAX14577_CHARGER)
 		return -EINVAL;

 	if (min_uA > MAX14577_REGULATOR_CURRENT_LIMIT_MAX ||
 			max_uA < MAX14577_REGULATOR_CURRENT_LIMIT_MIN)
 		return -EINVAL;

 	if (max_uA < MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_START) {
 		/* Less than 200 mA, so set 90mA (turn only Low Bit off) */
 		u8 reg_data = 0x0 << CHGCTRL4_MBCICHWRCL_SHIFT;
 		return max14577_update_reg(rdev->regmap,
 				MAX14577_CHG_REG_CHG_CTRL4,
 				CHGCTRL4_MBCICHWRCL_MASK, reg_data);
 	}

 	/* max_uA is in range: <LIMIT_HIGH_START, inifinite>, so search for
 	 * valid current starting from LIMIT_MAX. */
 	for (i = MAX14577_REGULATOR_CURRENT_LIMIT_MAX;
 			i >= MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_START;
 			i -= MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_STEP) {
 		if (i <= max_uA)
 			break;
 		current_bits--;
 	}
 	BUG_ON(current_bits < 0); /* Cannot happen */
 	/* Turn Low Bit on (use range 200mA-950 mA) */
 	reg_data = 0x1 << CHGCTRL4_MBCICHWRCL_SHIFT;
 	/* and set proper High Bits */
 	reg_data |= current_bits << CHGCTRL4_MBCICHWRCH_SHIFT;

 	return max14577_update_reg(rdev->regmap, MAX14577_CHG_REG_CHG_CTRL4,
 			CHGCTRL4_MBCICHWRCL_MASK | CHGCTRL4_MBCICHWRCH_MASK,
 			reg_data);
 }

 static struct regulator_ops max14577_safeout_ops = {
 	.is_enabled		= regulator_is_enabled_regmap,
 	.enable			= regulator_enable_regmap,
 	.disable		= regulator_disable_regmap,
 	.list_voltage		= regulator_list_voltage_linear,
 };

 static struct regulator_ops max14577_charger_ops = {
 	.is_enabled		= max14577_reg_is_enabled,
 	.enable			= regulator_enable_regmap,
 	.disable		= regulator_disable_regmap,
 	.get_current_limit	= max14577_reg_get_current_limit,
 	.set_current_limit	= max14577_reg_set_current_limit,
 };

 static const struct regulator_desc supported_regulators[] = {
 	[MAX14577_SAFEOUT] = {
 		.name		= "SAFEOUT",
 		.id		= MAX14577_SAFEOUT,
 		.ops		= &max14577_safeout_ops,
 		.type		= REGULATOR_VOLTAGE,
 		.owner		= THIS_MODULE,
 		.n_voltages	= 1,
 		.min_uV		= MAX14577_REGULATOR_SAFEOUT_VOLTAGE,
 		.enable_reg	= MAX14577_REG_CONTROL2,
 		.enable_mask	= CTRL2_SFOUTORD_MASK,
 	},
 	[MAX14577_CHARGER] = {
 		.name		= "CHARGER",
 		.id		= MAX14577_CHARGER,
 		.ops		= &max14577_charger_ops,
 		.type		= REGULATOR_CURRENT,
 		.owner		= THIS_MODULE,
 		.enable_reg	= MAX14577_CHG_REG_CHG_CTRL2,
 		.enable_mask	= CHGCTRL2_MBCHOSTEN_MASK,
 	},
 };

 #ifdef CONFIG_OF
 static struct of_regulator_match max14577_regulator_matches[] = {
 	{ .name	= "SAFEOUT", },
 	{ .name = "CHARGER", },
 };

 static int max14577_regulator_dt_parse_pdata(struct platform_device *pdev)
 {
 	int ret;
 	struct device_node *np;

 	np = of_get_child_by_name(pdev->dev.parent->of_node, "regulators");
 	if (!np) {
 		dev_err(&pdev->dev, "Failed to get child OF node for regulators\n");
 		return -EINVAL;
 	}

 	ret = of_regulator_match(&pdev->dev, np, max14577_regulator_matches,
 			MAX14577_REG_MAX);
 	if (ret < 0)
 		dev_err(&pdev->dev, "Error parsing regulator init data: %d\n", ret);
 	else
 		ret = 0;

 	of_node_put(np);

 	return ret;
 }

 static inline struct regulator_init_data *match_init_data(int index)
 {
 	return max14577_regulator_matches[index].init_data;
 }

 static inline struct device_node *match_of_node(int index)
 {
 	return max14577_regulator_matches[index].of_node;
 }
 #else /* CONFIG_OF */
 static int max14577_regulator_dt_parse_pdata(struct platform_device *pdev)
 {
 	return 0;
 }
 static inline struct regulator_init_data *match_init_data(int index)
 {
 	return NULL;
 }

 static inline struct device_node *match_of_node(int index)
 {
 	return NULL;
 }
 #endif /* CONFIG_OF */


 static int max14577_regulator_probe(struct platform_device *pdev)
 {
 	struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent);
 	struct max14577_platform_data *pdata = dev_get_platdata(max14577->dev);
 	int i, ret;
 	struct regulator_config config = {};

 	ret = max14577_regulator_dt_parse_pdata(pdev);
 	if (ret)
 		return ret;

 	config.dev = &pdev->dev;
 	config.regmap = max14577->regmap;

 	for (i = 0; i < ARRAY_SIZE(supported_regulators); i++) {
 		struct regulator_dev *regulator;
 		/*
 		 * Index of supported_regulators[] is also the id and must
 		 * match index of pdata->regulators[].
 		 */
 		if (pdata && pdata->regulators) {
 			config.init_data = pdata->regulators[i].initdata;
 			config.of_node = pdata->regulators[i].of_node;
 		} else {
 			config.init_data = match_init_data(i);
 			config.of_node = match_of_node(i);
 		}

 		regulator = devm_regulator_register(&pdev->dev,
 				&supported_regulators[i], &config);
 		if (IS_ERR(regulator)) {
 			ret = PTR_ERR(regulator);
 			dev_err(&pdev->dev,
 					"Regulator init failed for ID %d with error: %d\n",
 					i, ret);
 			return ret;
 		}
 	}

 	return ret;
 }

 static struct platform_driver max14577_regulator_driver = {
 	.driver = {
 		   .owner = THIS_MODULE,
 		   .name = "max14577-regulator",
 		   },
 	.probe	= max14577_regulator_probe,
 };

 static int __init max14577_regulator_init(void)
 {
 	BUILD_BUG_ON(MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_START +
 			MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_STEP * 0xf !=
 			MAX14577_REGULATOR_CURRENT_LIMIT_MAX);
 	BUILD_BUG_ON(ARRAY_SIZE(supported_regulators) != MAX14577_REG_MAX);

 	return platform_driver_register(&max14577_regulator_driver);
 }
 subsys_initcall(max14577_regulator_init);

 static void __exit max14577_regulator_exit(void)
 {
 	platform_driver_unregister(&max14577_regulator_driver);
 }
 module_exit(max14577_regulator_exit);

 MODULE_AUTHOR("Krzysztof Kozlowski <k.kozlowski@samsung.com>");
 MODULE_DESCRIPTION("MAXIM 14577 regulator driver");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:max14577-regulator");
	/*
	* max14577.c - Regulator driver for the Maxim 14577
	*
	* Copyright (C) 2013 Samsung Electronics
	* Krzysztof Kozlowski <k.kozlowski@samsung.com>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*/

	#include <linux/module.h>
	#include <linux/platform_device.h>
	#include <linux/regulator/driver.h>
	#include <linux/mfd/max14577.h>
	#include <linux/mfd/max14577-private.h>
	#include <linux/regulator/of_regulator.h>

	struct max14577_regulator {
	struct device *dev;
	struct max14577 *max14577;
	struct regulator_dev **regulators;
	};

	static int max14577_reg_is_enabled(struct regulator_dev *rdev)
	{
	int rid = rdev_get_id(rdev);
	struct regmap *rmap = rdev->regmap;
	u8 reg_data;

	switch (rid) {
	case MAX14577_CHARGER:
	max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL2, &reg_data);
	if ((reg_data & CHGCTRL2_MBCHOSTEN_MASK) == 0)
	return 0;
	max14577_read_reg(rmap, MAX14577_CHG_REG_STATUS3, &reg_data);
	if ((reg_data & STATUS3_CGMBC_MASK) == 0)
	return 0;
	/* MBCHOSTEN and CGMBC are on */
	return 1;
	default:
	return -EINVAL;
	}
	}

	static int max14577_reg_get_current_limit(struct regulator_dev *rdev)
	{
	u8 reg_data;
	struct regmap *rmap = rdev->regmap;

	if (rdev_get_id(rdev) != MAX14577_CHARGER)
	return -EINVAL;

	max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL4, &reg_data);

	if ((reg_data & CHGCTRL4_MBCICHWRCL_MASK) == 0)
	return MAX14577_REGULATOR_CURRENT_LIMIT_MIN;

	reg_data = ((reg_data & CHGCTRL4_MBCICHWRCH_MASK) >>
	CHGCTRL4_MBCICHWRCH_SHIFT);
	return MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_START +
	reg_data * MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_STEP;
	}

	static int max14577_reg_set_current_limit(struct regulator_dev *rdev,
	int min_uA, int max_uA)
	{
	int i, current_bits = 0xf;
	u8 reg_data;

	if (rdev_get_id(rdev) != MAX14577_CHARGER)
	return -EINVAL;

	if (min_uA > MAX14577_REGULATOR_CURRENT_LIMIT_MAX \|\|
	max_uA < MAX14577_REGULATOR_CURRENT_LIMIT_MIN)
	return -EINVAL;

	if (max_uA < MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_START) {
	/* Less than 200 mA, so set 90mA (turn only Low Bit off) */
	u8 reg_data = 0x0 << CHGCTRL4_MBCICHWRCL_SHIFT;
	return max14577_update_reg(rdev->regmap,
	MAX14577_CHG_REG_CHG_CTRL4,
	CHGCTRL4_MBCICHWRCL_MASK, reg_data);
	}

	/* max_uA is in range: <LIMIT_HIGH_START, inifinite>, so search for
	* valid current starting from LIMIT_MAX. */
	for (i = MAX14577_REGULATOR_CURRENT_LIMIT_MAX;
	i >= MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_START;
	i -= MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_STEP) {
	if (i <= max_uA)
	break;
	current_bits--;
	}
	BUG_ON(current_bits < 0); /* Cannot happen */
	/* Turn Low Bit on (use range 200mA-950 mA) */
	reg_data = 0x1 << CHGCTRL4_MBCICHWRCL_SHIFT;
	/* and set proper High Bits */
	reg_data \|= current_bits << CHGCTRL4_MBCICHWRCH_SHIFT;

	return max14577_update_reg(rdev->regmap, MAX14577_CHG_REG_CHG_CTRL4,
	CHGCTRL4_MBCICHWRCL_MASK \| CHGCTRL4_MBCICHWRCH_MASK,
	reg_data);
	}

	static struct regulator_ops max14577_safeout_ops = {
	.is_enabled = regulator_is_enabled_regmap,
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	.list_voltage = regulator_list_voltage_linear,
	};

	static struct regulator_ops max14577_charger_ops = {
	.is_enabled = max14577_reg_is_enabled,
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	.get_current_limit = max14577_reg_get_current_limit,
	.set_current_limit = max14577_reg_set_current_limit,
	};

	static const struct regulator_desc supported_regulators[] = {
	[MAX14577_SAFEOUT] = {
	.name = "SAFEOUT",
	.id = MAX14577_SAFEOUT,
	.ops = &max14577_safeout_ops,
	.type = REGULATOR_VOLTAGE,
	.owner = THIS_MODULE,
	.n_voltages = 1,
	.min_uV = MAX14577_REGULATOR_SAFEOUT_VOLTAGE,
	.enable_reg = MAX14577_REG_CONTROL2,
	.enable_mask = CTRL2_SFOUTORD_MASK,
	},
	[MAX14577_CHARGER] = {
	.name = "CHARGER",
	.id = MAX14577_CHARGER,
	.ops = &max14577_charger_ops,
	.type = REGULATOR_CURRENT,
	.owner = THIS_MODULE,
	.enable_reg = MAX14577_CHG_REG_CHG_CTRL2,
	.enable_mask = CHGCTRL2_MBCHOSTEN_MASK,
	},
	};

	#ifdef CONFIG_OF
	static struct of_regulator_match max14577_regulator_matches[] = {
	{ .name = "SAFEOUT", },
	{ .name = "CHARGER", },
	};

	static int max14577_regulator_dt_parse_pdata(struct platform_device *pdev)
	{
	int ret;
	struct device_node *np;

	np = of_get_child_by_name(pdev->dev.parent->of_node, "regulators");
	if (!np) {
	dev_err(&pdev->dev, "Failed to get child OF node for regulators\n");
	return -EINVAL;
	}

	ret = of_regulator_match(&pdev->dev, np, max14577_regulator_matches,
	MAX14577_REG_MAX);
	if (ret < 0)
	dev_err(&pdev->dev, "Error parsing regulator init data: %d\n", ret);
	else
	ret = 0;

	of_node_put(np);

	return ret;
	}

	static inline struct regulator_init_data *match_init_data(int index)
	{
	return max14577_regulator_matches[index].init_data;
	}

	static inline struct device_node *match_of_node(int index)
	{
	return max14577_regulator_matches[index].of_node;
	}
	#else /* CONFIG_OF */
	static int max14577_regulator_dt_parse_pdata(struct platform_device *pdev)
	{
	return 0;
	}
	static inline struct regulator_init_data *match_init_data(int index)
	{
	return NULL;
	}

	static inline struct device_node *match_of_node(int index)
	{
	return NULL;
	}
	#endif /* CONFIG_OF */


	static int max14577_regulator_probe(struct platform_device *pdev)
	{
	struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent);
	struct max14577_platform_data *pdata = dev_get_platdata(max14577->dev);
	int i, ret;
	struct regulator_config config = {};

	ret = max14577_regulator_dt_parse_pdata(pdev);
	if (ret)
	return ret;

	config.dev = &pdev->dev;
	config.regmap = max14577->regmap;

	for (i = 0; i < ARRAY_SIZE(supported_regulators); i++) {
	struct regulator_dev *regulator;
	/*
	* Index of supported_regulators[] is also the id and must
	* match index of pdata->regulators[].
	*/
	if (pdata && pdata->regulators) {
	config.init_data = pdata->regulators[i].initdata;
	config.of_node = pdata->regulators[i].of_node;
	} else {
	config.init_data = match_init_data(i);
	config.of_node = match_of_node(i);
	}

	regulator = devm_regulator_register(&pdev->dev,
	&supported_regulators[i], &config);
	if (IS_ERR(regulator)) {
	ret = PTR_ERR(regulator);
	dev_err(&pdev->dev,
	"Regulator init failed for ID %d with error: %d\n",
	i, ret);
	return ret;
	}
	}

	return ret;
	}

	static struct platform_driver max14577_regulator_driver = {
	.driver = {
	.owner = THIS_MODULE,
	.name = "max14577-regulator",
	},
	.probe = max14577_regulator_probe,
	};

	static int __init max14577_regulator_init(void)
	{
	BUILD_BUG_ON(MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_START +
	MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_STEP * 0xf !=
	MAX14577_REGULATOR_CURRENT_LIMIT_MAX);
	BUILD_BUG_ON(ARRAY_SIZE(supported_regulators) != MAX14577_REG_MAX);

	return platform_driver_register(&max14577_regulator_driver);
	}
	subsys_initcall(max14577_regulator_init);

	static void __exit max14577_regulator_exit(void)
	{
	platform_driver_unregister(&max14577_regulator_driver);
	}
	module_exit(max14577_regulator_exit);

	MODULE_AUTHOR("Krzysztof Kozlowski <k.kozlowski@samsung.com>");
	MODULE_DESCRIPTION("MAXIM 14577 regulator driver");
	MODULE_LICENSE("GPL");
	MODULE_ALIAS("platform:max14577-regulator");