Initial import

1 files changed, 369 insertions, 0 deletions

diff --git a/drivers/regulator/max14577.c b/drivers/regulator/max14577.c
new file mode 100644
index 000000000..b3678d289
--- /dev/null
+++ b/drivers/regulator/max14577.c
@@ -0,0 +1,369 @@
+/*
+ * max14577.c - Regulator driver for the Maxim 14577/77836
+ *
+ * Copyright (C) 2013,2014 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>
+
+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;
+	struct max14577 *max14577 = rdev_get_drvdata(rdev);
+	const struct maxim_charger_current *limits =
+		&maxim_charger_currents[max14577->dev_type];
+
+	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 limits->min;
+
+	reg_data = ((reg_data & CHGCTRL4_MBCICHWRCH_MASK) >>
+			CHGCTRL4_MBCICHWRCH_SHIFT);
+	return limits->high_start + reg_data * limits->high_step;
+}
+
+static int max14577_reg_set_current_limit(struct regulator_dev *rdev,
+		int min_uA, int max_uA)
+{
+	u8 reg_data;
+	int ret;
+	struct max14577 *max14577 = rdev_get_drvdata(rdev);
+	const struct maxim_charger_current *limits =
+		&maxim_charger_currents[max14577->dev_type];
+
+	if (rdev_get_id(rdev) != MAX14577_CHARGER)
+		return -EINVAL;
+
+	ret = maxim_charger_calc_reg_current(limits, min_uA, max_uA, &reg_data);
+	if (ret)
+		return ret;
+
+	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 max14577_supported_regulators[] = {
+	[MAX14577_SAFEOUT] = {
+		.name		= "SAFEOUT",
+		.of_match	= of_match_ptr("SAFEOUT"),
+		.regulators_node = of_match_ptr("regulators"),
+		.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",
+		.of_match	= of_match_ptr("CHARGER"),
+		.regulators_node = of_match_ptr("regulators"),
+		.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,
+	},
+};
+
+static struct regulator_ops max77836_ldo_ops = {
+	.is_enabled		= regulator_is_enabled_regmap,
+	.enable			= regulator_enable_regmap,
+	.disable		= regulator_disable_regmap,
+	.list_voltage		= regulator_list_voltage_linear,
+	.map_voltage		= regulator_map_voltage_linear,
+	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
+	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
+	/* TODO: add .set_suspend_mode */
+};
+
+static const struct regulator_desc max77836_supported_regulators[] = {
+	[MAX14577_SAFEOUT] = {
+		.name		= "SAFEOUT",
+		.of_match	= of_match_ptr("SAFEOUT"),
+		.regulators_node = of_match_ptr("regulators"),
+		.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",
+		.of_match	= of_match_ptr("CHARGER"),
+		.regulators_node = of_match_ptr("regulators"),
+		.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,
+	},
+	[MAX77836_LDO1] = {
+		.name		= "LDO1",
+		.of_match	= of_match_ptr("LDO1"),
+		.regulators_node = of_match_ptr("regulators"),
+		.id		= MAX77836_LDO1,
+		.ops		= &max77836_ldo_ops,
+		.type		= REGULATOR_VOLTAGE,
+		.owner		= THIS_MODULE,
+		.n_voltages	= MAX77836_REGULATOR_LDO_VOLTAGE_STEPS_NUM,
+		.min_uV		= MAX77836_REGULATOR_LDO_VOLTAGE_MIN,
+		.uV_step	= MAX77836_REGULATOR_LDO_VOLTAGE_STEP,
+		.enable_reg	= MAX77836_LDO_REG_CNFG1_LDO1,
+		.enable_mask	= MAX77836_CNFG1_LDO_PWRMD_MASK,
+		.vsel_reg	= MAX77836_LDO_REG_CNFG1_LDO1,
+		.vsel_mask	= MAX77836_CNFG1_LDO_TV_MASK,
+	},
+	[MAX77836_LDO2] = {
+		.name		= "LDO2",
+		.of_match	= of_match_ptr("LDO2"),
+		.regulators_node = of_match_ptr("regulators"),
+		.id		= MAX77836_LDO2,
+		.ops		= &max77836_ldo_ops,
+		.type		= REGULATOR_VOLTAGE,
+		.owner		= THIS_MODULE,
+		.n_voltages	= MAX77836_REGULATOR_LDO_VOLTAGE_STEPS_NUM,
+		.min_uV		= MAX77836_REGULATOR_LDO_VOLTAGE_MIN,
+		.uV_step	= MAX77836_REGULATOR_LDO_VOLTAGE_STEP,
+		.enable_reg	= MAX77836_LDO_REG_CNFG1_LDO2,
+		.enable_mask	= MAX77836_CNFG1_LDO_PWRMD_MASK,
+		.vsel_reg	= MAX77836_LDO_REG_CNFG1_LDO2,
+		.vsel_mask	= MAX77836_CNFG1_LDO_TV_MASK,
+	},
+};
+
+#ifdef CONFIG_OF
+static struct of_regulator_match max14577_regulator_matches[] = {
+	{ .name	= "SAFEOUT", },
+	{ .name = "CHARGER", },
+};
+
+static struct of_regulator_match max77836_regulator_matches[] = {
+	{ .name	= "SAFEOUT", },
+	{ .name = "CHARGER", },
+	{ .name = "LDO1", },
+	{ .name = "LDO2", },
+};
+
+static inline struct regulator_init_data *match_init_data(int index,
+		enum maxim_device_type dev_type)
+{
+	switch (dev_type) {
+	case MAXIM_DEVICE_TYPE_MAX77836:
+		return max77836_regulator_matches[index].init_data;
+
+	case MAXIM_DEVICE_TYPE_MAX14577:
+	default:
+		return max14577_regulator_matches[index].init_data;
+	}
+}
+
+static inline struct device_node *match_of_node(int index,
+		enum maxim_device_type dev_type)
+{
+	switch (dev_type) {
+	case MAXIM_DEVICE_TYPE_MAX77836:
+		return max77836_regulator_matches[index].of_node;
+
+	case MAXIM_DEVICE_TYPE_MAX14577:
+	default:
+		return max14577_regulator_matches[index].of_node;
+	}
+}
+#else /* CONFIG_OF */
+static inline struct regulator_init_data *match_init_data(int index,
+		enum maxim_device_type dev_type)
+{
+	return NULL;
+}
+
+static inline struct device_node *match_of_node(int index,
+		enum maxim_device_type dev_type)
+{
+	return NULL;
+}
+#endif /* CONFIG_OF */
+
+/**
+ * Registers for regulators of max77836 use different I2C slave addresses so
+ * different regmaps must be used for them.
+ *
+ * Returns proper regmap for accessing regulator passed by id.
+ */
+static struct regmap *max14577_get_regmap(struct max14577 *max14577,
+		int reg_id)
+{
+	switch (max14577->dev_type) {
+	case MAXIM_DEVICE_TYPE_MAX77836:
+		switch (reg_id) {
+		case MAX77836_SAFEOUT ... MAX77836_CHARGER:
+			return max14577->regmap;
+		default:
+			/* MAX77836_LDO1 ... MAX77836_LDO2 */
+			return max14577->regmap_pmic;
+		}
+
+	case MAXIM_DEVICE_TYPE_MAX14577:
+	default:
+		return max14577->regmap;
+	}
+}
+
+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 = 0;
+	struct regulator_config config = {};
+	const struct regulator_desc *supported_regulators;
+	unsigned int supported_regulators_size;
+	enum maxim_device_type dev_type = max14577->dev_type;
+
+	switch (dev_type) {
+	case MAXIM_DEVICE_TYPE_MAX77836:
+		supported_regulators = max77836_supported_regulators;
+		supported_regulators_size = ARRAY_SIZE(max77836_supported_regulators);
+		break;
+	case MAXIM_DEVICE_TYPE_MAX14577:
+	default:
+		supported_regulators = max14577_supported_regulators;
+		supported_regulators_size = ARRAY_SIZE(max14577_supported_regulators);
+	}
+
+	config.dev = max14577->dev;
+	config.driver_data = max14577;
+
+	for (i = 0; i < supported_regulators_size; 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, dev_type);
+			config.of_node = match_of_node(i, dev_type);
+		}
+		config.regmap = max14577_get_regmap(max14577,
+				supported_regulators[i].id);
+
+		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 %d/%s with error: %d\n",
+					i, supported_regulators[i].name, ret);
+			return ret;
+		}
+	}
+
+	return ret;
+}
+
+static const struct platform_device_id max14577_regulator_id[] = {
+	{ "max14577-regulator", MAXIM_DEVICE_TYPE_MAX14577, },
+	{ "max77836-regulator", MAXIM_DEVICE_TYPE_MAX77836, },
+	{ }
+};
+MODULE_DEVICE_TABLE(platform, max14577_regulator_id);
+
+static struct platform_driver max14577_regulator_driver = {
+	.driver = {
+		   .name = "max14577-regulator",
+		   },
+	.probe		= max14577_regulator_probe,
+	.id_table	= max14577_regulator_id,
+};
+
+static int __init max14577_regulator_init(void)
+{
+	BUILD_BUG_ON(ARRAY_SIZE(max14577_supported_regulators) != MAX14577_REGULATOR_NUM);
+	BUILD_BUG_ON(ARRAY_SIZE(max77836_supported_regulators) != MAX77836_REGULATOR_NUM);
+
+	BUILD_BUG_ON(MAX77836_REGULATOR_LDO_VOLTAGE_MIN +
+			(MAX77836_REGULATOR_LDO_VOLTAGE_STEP *
+			  (MAX77836_REGULATOR_LDO_VOLTAGE_STEPS_NUM - 1)) !=
+			MAX77836_REGULATOR_LDO_VOLTAGE_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 14577/77836 regulator driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:max14577-regulator");