regulator: max77693: Add max77693 regualtor driver.

This patch adds new regulator driver to support max77693 chip's regulators.
max77693 has two linear voltage regulators and one current regulator which
can be controlled through I2C bus. This driver also supports device tree.

Signed-off-by: Jonghwa Lee <jonghwa3.lee@samsung.com>
Signed-off-by: Myungjoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

6 files changed, 420 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/mfd/max77693.txt b/Documentation/devicetree/bindings/mfd/max77693.txt
new file mode 100644
index 000000000000..11921cc417bf
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/max77693.txt
@@ -0,0 +1,55 @@
+Maxim MAX77693 multi-function device
+
+MAX77693 is a Multifunction device with the following submodules:
+- PMIC,
+- CHARGER,
+- LED,
+- MUIC,
+- HAPTIC
+
+It is interfaced to host controller using i2c.
+This document describes the bindings for the mfd device.
+
+Required properties:
+- compatible : Must be "maxim,max77693".
+- reg : Specifies the i2c slave address of PMIC block.
+- interrupts : This i2c device has an IRQ line connected to the main SoC.
+- interrupt-parent :  The parent interrupt controller.
+
+Optional properties:
+- regulators : The regulators of max77693 have to be instantiated under subnod
+  named "regulators" using the following format.
+
+        regulators {
+                regualtor-compatible = ESAFEOUT1/ESAFEOUT2/CHARGER
+                standard regulator constratints[*].
+        };
+
+        [*] refer Documentation/devicetree/bindings/regulator/regulator.txt
+
+Example:
+        max77693@66 {
+                compatible = "maxim,max77693";
+                reg = <0x66>;
+                interrupt-parent = <&gpx1>;
+                interrupts = <5 2>;
+
+                regulators {
+                        esafeout@1 {
+                                regulator-compatible = "ESAFEOUT1";
+                                regulator-name = "ESAFEOUT1";
+                                regulator-boot-on;
+                        };
+                        esafeout@2 {
+                                regulator-compatible = "ESAFEOUT2";
+                                regulator-name = "ESAFEOUT2";
+                                };
+                        charger@0 {
+                                regulator-compatible = "CHARGER";
+                                regulator-name = "CHARGER";
+                                regulator-min-microamp = <60000>;
+                                regulator-max-microamp = <2580000>;
+                                        regulator-boot-on;
+                        };
+                };
+        };
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..674ece7c832b
--- /dev/null
+++ b/drivers/regulator/max77693.c
@@ -0,0 +1,324 @@
+/*
+ * 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,
+