Merge remote-tracking branch 'regulator/fix/max77693' into regulator-linus

3 files changed, 332 insertions, 0 deletions

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 8bb26446037e..9744437afe32 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -250,6 +250,15 @@ config REGULATOR_MAX77686
 	  via I2C bus. The provided regulator is suitable for
 	  Exynos-4 chips to control VARM and VINT voltages.
 
+config REGULATOR_MAX77693
+	tristate "Maxim MAX77693 regulator"
+	depends on MFD_MAX77693
+	help
+	  This driver controls a Maxim 77693 regulator via I2C bus.
+	  The regulators include two LDOs, 'SAFEOUT1', 'SAFEOUT2'
+	  and one current regulator 'CHARGER'. This is suitable for
+	  Exynos-4x12 chips.
+
 config REGULATOR_PCAP
 	tristate "Motorola PCAP2 regulator driver"
 	depends on EZX_PCAP
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index 47a34ff88f98..a4094cd274be 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -41,6 +41,7 @@ obj-$(CONFIG_REGULATOR_MAX8973) += max8973-regulator.o
 obj-$(CONFIG_REGULATOR_MAX8997) += max8997.o
 obj-$(CONFIG_REGULATOR_MAX8998) += max8998.o
 obj-$(CONFIG_REGULATOR_MAX77686) += max77686.o
+obj-$(CONFIG_REGULATOR_MAX77693) += max77693.o
 obj-$(CONFIG_REGULATOR_MC13783) += mc13783-regulator.o
 obj-$(CONFIG_REGULATOR_MC13892) += mc13892-regulator.o
 obj-$(CONFIG_REGULATOR_MC13XXX_CORE) +=  mc13xxx-regulator-core.o
diff --git a/drivers/regulator/max77693.c b/drivers/regulator/max77693.c
new file mode 100644
index 000000000000..ce4b96c15eba
--- /dev/null
+++ b/drivers/regulator/max77693.c
@@ -0,0 +1,322 @@
+/*
+ * max77693.c - Regulator driver for the Maxim 77693
+ *
+ * Copyright (C) 2013 Samsung Electronics
+ * Jonghwa Lee <jonghwa3.lee@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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * This driver is based on max77686.c
+ */
+
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/module.h>
+#include <linux/export.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/mfd/max77693.h>
+#include <linux/mfd/max77693-private.h>
+#include <linux/regulator/of_regulator.h>
+
+#define CHGIN_ILIM_STEP_20mA			20000
+
+struct max77693_pmic_dev {
+	struct device *dev;
+	struct max77693_dev *iodev;
+	int num_regulators;
+	struct regulator_dev **rdev;
+};
+
+/* CHARGER regulator ops */
+/* CHARGER regulator uses two bits for enabling */
+static int max77693_chg_is_enabled(struct regulator_dev *rdev)
+{
+	int ret;
+	u8 val;
+
+	ret = max77693_read_reg(rdev->regmap, rdev->desc->enable_reg, &val);
+	if (ret)
+		return ret;
+
+	return (val & rdev->desc->enable_mask) == rdev->desc->enable_mask;
+}
+
+/*
+ * CHARGER regulator - Min : 20mA, Max : 2580mA, step : 20mA
+ * 0x00, 0x01, 0x2, 0x03	= 60 mA
+ * 0x04 ~ 0x7E			= (60 + (X - 3) * 20) mA
+ */
+static int max77693_chg_get_current_limit(struct regulator_dev *rdev)
+{
+	unsigned int chg_min_uA = rdev->constraints->min_uA;
+	unsigned int chg_max_uA = rdev->constraints->max_uA;
+	u8 reg, sel;
+	unsigned int val;
+	int ret;
+
+	ret = max77693_read_reg(rdev->regmap,
+				MAX77693_CHG_REG_CHG_CNFG_09, &reg);
+	if (ret < 0)
+		return ret;
+
+	sel = reg & CHG_CNFG_09_CHGIN_ILIM_MASK;
+
+	/* the first four codes for charger current are all 60mA */
+	if (sel <= 3)
+		sel = 0;
+	else
+		sel -= 3;
+
+	val = chg_min_uA + CHGIN_ILIM_STEP_20mA * sel;
+	if (val > chg_max_uA)
+		return -EINVAL;
+
+	return val;
+}
+
+static int max77693_chg_set_current_limit(struct regulator_dev *rdev,
+						int min_uA, int max_uA)
+{
+	unsigned int chg_min_uA = rdev->constraints->min_uA;
+	int sel = 0;
+
+	while (chg_min_uA + CHGIN_ILIM_STEP_20mA * sel < min_uA)
+		sel++;
+
+	if (chg_min_uA + CHGIN_ILIM_STEP_20mA * sel > max_uA)
+		return -EINVAL;
+
+	/* the first four codes for charger current are all 60mA */
+	sel += 3;
+
+	return max77693_write_reg(rdev->regmap,
+				MAX77693_CHG_REG_CHG_CNFG_09, sel);
+}
+/* end of CHARGER regulator ops */
+
+static const unsigned int max77693_safeout_table[] = {
+	4850000,
+	4900000,
+	4950000,
+	3300000,
+};
+
+static struct regulator_ops max77693_safeout_ops = {
+	.list_voltage		= regulator_list_voltage_table,
+	.is_enabled		= regulator_is_enabled_regmap,
+	.enable			= regulator_enable_regmap,
+	.disable		= regulator_disable_regmap,
+	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
+	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
+};
+
+static struct regulator_ops max77693_charger_ops = {
+	.is_enabled		= max77693_chg_is_enabled,
+	.enable			= regulator_enable_regmap,
+	.disable		= regulator_disable_regmap,
+	.get_current_limit	= max77693_chg_get_current_limit,
+	.set_current_limit	= max77693_chg_set_current_limit,
+};
+
+#define regulator_desc_esafeout(_num)	{			\
+	.name		= "ESAFEOUT"#_num,			\
+	.id		= MAX77693_ESAFEOUT##_num,		\
+	.n_voltages	= 4,					\
+	.ops		= &max77693_safeout_ops,		\
+	.type		= REGULATOR_VOLTAGE,			\
+	.volt_table	= max77693_safeout_table,		\
+	.vsel_reg	= MAX77693_CHG_REG_SAFEOUT_CTRL,	\
+	.vsel_mask	= SAFEOUT_CTRL_SAFEOUT##_num##_MASK,	\
+	.enable_reg	= MAX77693_CHG_REG_SAFEOUT_CTRL,	\
+	.enable_mask	= SAFEOUT_CTRL_ENSAFEOUT##_num##_MASK ,	\
+}
+
+static struct regulator_desc regulators[] = {
+	regulator_desc_esafeout(1),
+	regulator_desc_esafeout(2),
+	{
+		.name = "CHARGER",
+		.id = MAX77693_CHARGER,
+		.ops = &max77693_charger_ops,
+		.type = REGULATOR_CURRENT,
+		.owner = THIS_MODULE,
+		.enable_reg = MAX77693_CHG_REG_CHG_CNFG_00,
+		.enable_mask = CHG_CNFG_00_CHG_MASK |
+				CHG_CNFG_00_BUCK_MASK,
+	},
+};
+
+#ifdef CONFIG_OF
+static int max77693_pmic_dt_parse_rdata(struct device *dev,
+					struct max77693_regulator_data **rdata)
+{
+	struct device_node *np;
+	struct of_regulator_match *rmatch;
+	struct max77693_regulator_data *tmp;
+	int i, matched = 0;
+
+	np = of_find_node_by_name(dev->parent->of_node, "regulators");
+	if (!np)
+		return -EINVAL;
+
+	rmatch = devm_kzalloc(dev,
+		 sizeof(*rmatch) * ARRAY_SIZE(regulators), GFP_KERNEL);
+	if (!rmatch)
+		return -ENOMEM;
+
+	for (i = 0; i < ARRAY_SIZE(regulators); i++)
+		rmatch[i].name = regulators[i].name;
+
+	matched = of_regulator_match(dev, np, rmatch, ARRAY_SIZE(regulators));
+	if (matched <= 0)
+		return matched;
+	*rdata = devm_kzalloc(dev, sizeof(**rdata) * matched, GFP_KERNEL);
+	if (!(*rdata))
+		return -ENOMEM;
+
+	tmp = *rdata;
+
+	for (i = 0; i < matched; i++) {
+		tmp->initdata = rmatch[i].init_data;
+		tmp->of_node = rmatch[i].of_node;
+		tmp->id = regulators[i].id;
+		tmp++;
+	}
+
+	return matched;
+}
+#else
+static int max77693_pmic_dt_parse_rdata(struct device *dev,
+					struct max77693_regulator_data **rdata)
+{
+	return 0;
+}
+#endif /* CONFIG_OF */
+
+static int max77693_pmic_init_rdata(struct device *dev,
+				    struct max77693_regulator_data **rdata)
+{
+	struct max77693_platform_data *pdata;
+	int num_regulators = 0;
+
+	pdata = dev_get_platdata(dev->parent);
+	if (pdata) {
+		*rdata = pdata->regulators;
+		num_regulators = pdata->num_regulators;
+	}
+
+	if (!(*rdata) && dev->parent->of_node)
+		num_regulators = max77693_pmic_dt_parse_rdata(dev, rdata);
+
+	return num_regulators;
+}
+
+static int max77693_pmic_probe(struct platform_device *pdev)
+{
+	struct max77693_dev *iodev = dev_get_drvdata(pdev->dev.parent);
+	struct max77693_pmic_dev *max77693_pmic;
+	struct max77693_regulator_data *rdata = NULL;
+	int num_rdata, i, ret;
+	struct regulator_config config;
+
+	num_rdata = max77693_pmic_init_rdata(&pdev->dev, &rdata);
+	if (!rdata || num_rdata <= 0) {
+		dev_err(&pdev->dev, "No init data supplied.\n");
+		return -ENODEV;
+	}
+
+	max77693_pmic = devm_kzalloc(&pdev->dev,
+				sizeof(struct max77693_pmic_dev),
+				GFP_KERNEL);
+	if (!max77693_pmic)
+		return -ENOMEM;
+
+	max77693_pmic->rdev = devm_kzalloc(&pdev->dev,
+				sizeof(struct regulator_dev *) * num_rdata,
+				GFP_KERNEL);
+	if (!max77693_pmic->rdev)
+		return -ENOMEM;
+
+	max77693_pmic->dev = &pdev->dev;
+	max77693_pmic->iodev = iodev;
+	max77693_pmic->num_regulators = num_rdata;
+
+	config.dev = &pdev->dev;
+	config.regmap = iodev->regmap;
+	config.driver_data = max77693_pmic;
+	platform_set_drvdata(pdev, max77693_pmic);
+
+	for (i = 0; i < max77693_pmic->num_regulators; i++) {
+		int id = rdata[i].id;
+
+		config.init_data = rdata[i].initdata;
+		config.of_node = rdata[i].of_node;
+
+		max77693_pmic->rdev[i] = regulator_register(&regulators[id],
+							    &config);
+		if (IS_ERR(max77693_pmic->rdev[i])) {
+			ret = PTR_ERR(max77693_pmic->rdev[i]);
+			dev_err(max77693_pmic->dev,
+				"Failed to initialize regulator-%d\n", id);
+			max77693_pmic->rdev[i] = NULL;
+			goto err;
+		}
+	}
+
+	return 0;
+ err:
+	while (--i >= 0)
+		regulator_unregister(max77693_pmic->rdev[i]);
+
+	return ret;
+}
+
+static int max77693_pmic_remove(struct platform_device *pdev)
+{
+	struct max77693_pmic_dev *max77693_pmic = platform_get_drvdata(pdev);
+	struct regulator_dev **rdev = max77693_pmic->rdev;
+	int i;
+
+	for (i = 0; i < max77693_pmic->num_regulators; i++)
+		if (rdev[i])
+			regulator_unregister(rdev[i]);
+
+	return 0;
+}
+
+static const struct platform_device_id max77693_pmic_id[] = {
+	{"max77693-pmic", 0},
+	{},
+};
+
+MODULE_DEVICE_TABLE(platform, max77693_pmic_id);
+
+static struct platform_driver max77693_pmic_driver = {
+	.driver = {
+		   .name = "max77693-pmic",
+		   .owner = THIS_MODULE,
+		   },
+	.probe = max77693_pmic_probe,
+	.remove = max77693_pmic_remove,
+	.id_table = max77693_pmic_id,
+};
+
+module_platform_driver(max77693_pmic_driver);
+
+MODULE_DESCRIPTION("MAXIM MAX77693 regulator driver");
+MODULE_AUTHOR("Jonghwa Lee <jonghwa3.lee@samsung.com>");
+MODULE_LICENSE("GPL");