5 files changed, 342 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/input/regulator-haptic.txt b/Documentation/devicetree/bindings/input/regulator-haptic.txt
new file mode 100644
index 000000000000..3ed1c7eb2f97
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/regulator-haptic.txt
@@ -0,0 +1,21 @@
+* Regulator Haptic Device Tree Bindings
+
+Required Properties:
+ - compatible : Should be "regulator-haptic"
+ - haptic-supply : Power supply to the haptic motor.
+        [*] refer Documentation/devicetree/bindings/regulator/regulator.txt
+
+ - max-microvolt : The maximum voltage value supplied to the haptic motor.
+                [The unit of the voltage is a micro]
+
+ - min-microvolt : The minimum voltage value supplied to the haptic motor.
+                [The unit of the voltage is a micro]
+
+Example:
+
+        haptics {
+                compatible = "regulator-haptic";
+                haptic-supply = <&motor_regulator>;
+                max-microvolt = <2700000>;
+                min-microvolt = <1100000>;
+        };
diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index 23297ab6163f..1da0a20c42ea 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -394,6 +394,18 @@ config INPUT_CM109
           To compile this driver as a module, choose M here: the module will be
           called cm109.
 
+config INPUT_REGULATOR_HAPTIC
+        tristate "Regulator haptics support"
+        depends on REGULATOR
+        select INPUT_FF_MEMLESS
+        help
+          This option enables device driver support for the haptic controlled
+          by a regulator. This driver supports ff-memless interface
+          from input framework.
+
+          To compile this driver as a module, choose M here: the
+          module will be called regulator-haptic.
+
 config INPUT_RETU_PWRBUTTON
         tristate "Retu Power button Driver"
         depends on MFD_RETU
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index 19c760361f80..1f135af4af01 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -53,6 +53,7 @@ obj-$(CONFIG_INPUT_PMIC8XXX_PWRKEY)	+= pmic8xxx-pwrkey.o
 obj-$(CONFIG_INPUT_POWERMATE)           += powermate.o
 obj-$(CONFIG_INPUT_PWM_BEEPER)          += pwm-beeper.o
 obj-$(CONFIG_INPUT_RB532_BUTTON)        += rb532_button.o
+obj-$(CONFIG_INPUT_REGULATOR_HAPTIC)    += regulator-haptic.o
 obj-$(CONFIG_INPUT_RETU_PWRBUTTON)      += retu-pwrbutton.o
 obj-$(CONFIG_INPUT_GPIO_ROTARY_ENCODER) += rotary_encoder.o
 obj-$(CONFIG_INPUT_SGI_BTNS)            += sgi_btns.o
diff --git a/drivers/input/misc/regulator-haptic.c b/drivers/input/misc/regulator-haptic.c
new file mode 100644
index 000000000000..942622189bee
--- /dev/null
+++ b/drivers/input/misc/regulator-haptic.c
@@ -0,0 +1,279 @@
+/*
+ * Regulator haptic driver
+ *
+ * Copyright (c) 2014 Samsung Electronics Co., Ltd.
+ * Author: Jaewon Kim <jaewon02.kim@samsung.com>
+ * Author: Hyunhee Kim <hyunhee.kim@samsung.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/input.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_data/regulator-haptic.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
+#include <linux/slab.h>
+
+#define MAX_MAGNITUDE_SHIFT     16
+
+struct regulator_haptic {
+        struct device *dev;
+        struct input_dev *input_dev;
+        struct regulator *regulator;
+
+        struct work_struct work;
+        struct mutex mutex;
+
+        bool active;
+        bool suspended;
+
+        unsigned int max_volt;
+        unsigned int min_volt;
+        unsigned int magnitude;
+};
+
+static int regulator_haptic_toggle(struct regulator_haptic *haptic, bool on)
+{
+        int error;
+
+        if (haptic->active != on) {
+
+                error = on ? regulator_enable(haptic->regulator) :
+                             regulator_disable(haptic->regulator);
+                if (error) {
+                        dev_err(haptic->dev,
+                                "failed to switch regulator %s: %d\n",
+                                on ? "on" : "off", error);
+                        return error;
+                }
+
+                haptic->active = on;
+        }
+
+        return 0;
+}
+
+static int regulator_haptic_set_voltage(struct regulator_haptic *haptic,
+                                         unsigned int magnitude)
+{
+        u64 volt_mag_multi;
+        unsigned int intensity;
+        int error;
+
+        volt_mag_multi = (u64)(haptic->max_volt - haptic->min_volt) * magnitude;
+        intensity = (unsigned int)(volt_mag_multi >> MAX_MAGNITUDE_SHIFT);
+
+        error = regulator_set_voltage(haptic->regulator,
+                                      intensity + haptic->min_volt,
+                                      haptic->max_volt);
+        if (error) {
+                dev_err(haptic->dev, "cannot set regulator voltage to %d: %d\n",
+                        intensity + haptic->min_volt, error);
+                return error;
+        }
+
+        return 0;
+}
+
+static void regulator_haptic_work(struct work_struct *work)
+{
+        struct regulator_haptic *haptic = container_of(work,
+                                        struct regulator_haptic, work);
+        unsigned int magnitude;
+        int error;
+
+        mutex_lock(&haptic->mutex);
+
+        if (haptic->suspended)
+                goto out;
+
+        magnitude = ACCESS_ONCE(haptic->magnitude);
+
+        error = regulator_haptic_set_voltage(haptic, magnitude);
+        if (error)
+                goto out;
+
+        regulator_haptic_toggle(haptic, magnitude != 0);
+
+out:
+        mutex_unlock(&haptic->mutex);
+}
+
+static int regulator_haptic_play_effect(struct input_dev *input, void *data,
+                                        struct ff_effect *effect)
+{
+        struct regulator_haptic *haptic = input_get_drvdata(input);
+
+        haptic->magnitude = effect->u.rumble.strong_magnitude;
+        if (!haptic->magnitude)
+                haptic->magnitude = effect->u.rumble.weak_magnitude;
+
+        schedule_work(&haptic->work);
+
+        return 0;
+}
+
+static void regulator_haptic_close(struct input_dev *input)
+{
+        struct regulator_haptic *haptic = input_get_drvdata(input);
+
+        cancel_work_sync(&haptic->work);
+        regulator_haptic_set_voltage(haptic, 0);
+        regulator_haptic_toggle(haptic, false);
+}
+
+static int __maybe_unused