regulator: Rename files for Maxim PMIC drivers

Most Maxim PMIC regulator drivers are for sub-devices of Multi-Function
Devices with drivers under drivers/mfd. But for many of these, the same
object file name was used for both the MFD and the regulator drivers.

Having 2 different drivers with the same name causes a lot of confusion
to Kbuild, specially if these are built as module since only one module
will be installed and also exported symbols will be undefined due being
overwritten by the other module during modpost.

For example, it fixes the following issue when both drivers are module:

$ make M=drivers/regulator/
  ...
  CC [M]  drivers/regulator//max14577.o
  Building modules, stage 2.
  MODPOST 1 modules
WARNING: "maxim_charger_calc_reg_current" [drivers/regulator//max14577.ko] undefined!
WARNING: "maxim_charger_currents" [drivers/regulator//max14577.ko] undefined!

Reported-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 337 insertions, 0 deletions

diff --git a/drivers/regulator/max14577-regulator.c b/drivers/regulator/max14577-regulator.c
new file mode 100644
index 000000000000..b2daa6641417
--- /dev/null
+++ b/drivers/regulator/max14577-regulator.c
@@ -0,0 +1,337 @@
+/*
+ * 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,
+};
+
+#define MAX14577_SAFEOUT_REG	{ \
+	.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, \
+}
+#define MAX14577_CHARGER_REG	{ \
+	.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 const struct regulator_desc max14577_supported_regulators[] = {
+	[MAX14577_SAFEOUT] = MAX14577_SAFEOUT_REG,
+	[MAX14577_CHARGER] = MAX14577_CHARGER_REG,
+};
+
+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 */
+};
+
+#define MAX77836_LDO_REG(num)	{ \
+	.name		= "LDO" # num, \
+	.of_match	= of_match_ptr("LDO" # num), \
+	.regulators_node = of_match_ptr("regulators"), \
+	.id		= MAX77836_LDO ## num, \
+	.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_LDO ## num, \
+	.enable_mask	= MAX77836_CNFG1_LDO_PWRMD_MASK, \
+	.vsel_reg	= MAX77836_LDO_REG_CNFG1_LDO ## num, \
+	.vsel_mask	= MAX77836_CNFG1_LDO_TV_MASK, \
+}
+
+static const struct regulator_desc max77836_supported_regulators[] = {
+	[MAX14577_SAFEOUT] = MAX14577_SAFEOUT_REG,
+	[MAX14577_CHARGER] = MAX14577_CHARGER_REG,
+	[MAX77836_LDO1] = MAX77836_LDO_REG(1),
+	[MAX77836_LDO2] = MAX77836_LDO_REG(2),
+};
+
+#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");