3 files changed, 371 insertions, 0 deletions

diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index 6deb8dae3205..ef542f7ad944 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -165,6 +165,18 @@ config INPUT_MAX77693_HAPTIC
           To compile this driver as module, choose M here: the
           module will be called max77693-haptic.
 
+config INPUT_MAX77843_HAPTIC
+    tristate "MAXIM MAX77843 haptic controller support"
+    depends on MFD_MAX77843 && REGULATOR
+    select INPUT_FF_MEMLESS
+    help
+      This option enables support for the haptic controller on
+      MAXIM MAX77843 chip. The driver supports ff-memless interface
+      from input framework.
+
+      To compile this driver as module, choose M here: the
+      module will be called max77843-haptic.
+
 config INPUT_MAX8925_ONKEY
         tristate "MAX8925 ONKEY support"
         depends on MFD_MAX8925
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index 403a1a54a76c..75b58841d5a7 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -39,6 +39,7 @@ obj-$(CONFIG_INPUT_KEYSPAN_REMOTE)	+= keyspan_remote.o
 obj-$(CONFIG_INPUT_KXTJ9)               += kxtj9.o
 obj-$(CONFIG_INPUT_M68K_BEEP)           += m68kspkr.o
 obj-$(CONFIG_INPUT_MAX77693_HAPTIC)     += max77693-haptic.o
+obj-$(CONFIG_INPUT_MAX77843_HAPTIC)     += max77843-haptic.o
 obj-$(CONFIG_INPUT_MAX8925_ONKEY)       += max8925_onkey.o
 obj-$(CONFIG_INPUT_MAX8997_HAPTIC)      += max8997_haptic.o
 obj-$(CONFIG_INPUT_MC13783_PWRBUTTON)   += mc13783-pwrbutton.o
diff --git a/drivers/input/misc/max77843-haptic.c b/drivers/input/misc/max77843-haptic.c
new file mode 100644
index 000000000000..dccbb465a055
--- /dev/null
+++ b/drivers/input/misc/max77843-haptic.c
@@ -0,0 +1,358 @@
+/*
+ * MAXIM MAX77693 Haptic device driver
+ *
+ * Copyright (C) 2015 Samsung Electronics
+ * Author: Jaewon Kim <jaewon02.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 as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/input.h>
+#include <linux/mfd/max77843-private.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/pwm.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+#include <linux/slab.h>
+#include <linux/workqueue.h>
+
+#define MAX_MAGNITUDE_SHIFT        16
+
+enum max77843_haptic_motor_type {
+        MAX77843_HAPTIC_ERM = 0,
+        MAX77843_HAPTIC_LRA,
+};
+
+enum max77843_haptic_pwm_divisor {
+        MAX77843_HAPTIC_PWM_DIVISOR_32 = 0,
+        MAX77843_HAPTIC_PWM_DIVISOR_64,
+        MAX77843_HAPTIC_PWM_DIVISOR_128,
+        MAX77843_HAPTIC_PWM_DIVISOR_256,
+};
+
+struct max77843_haptic {
+        struct regmap *regmap_haptic;
+        struct device *dev;
+        struct input_dev *input_dev;
+        struct pwm_device *pwm_dev;
+        struct regulator *motor_reg;
+        struct work_struct work;
+        struct mutex mutex;
+
+        unsigned int magnitude;
+        unsigned int pwm_duty;
+
+        bool active;
+        bool suspended;
+
+        enum max77843_haptic_motor_type type;
+        enum max77843_haptic_pwm_divisor pwm_divisor;
+};
+
+static int max77843_haptic_set_duty_cycle(struct max77843_haptic *haptic)
+{
+        int delta = (haptic->pwm_dev->period + haptic->pwm_duty) / 2;
+        int error;
+
+        error = pwm_config(haptic->pwm_dev, delta, haptic->pwm_dev->period);
+        if (error) {
+                dev_err(haptic->dev, "failed to configure pwm: %d\n", error);
+                return error;
+        }
+
+        return 0;
+}
+
+static int max77843_haptic_bias(struct max77843_haptic *haptic, bool on)
+{
+        int error;
+
+        error = regmap_update_bits(haptic->regmap_haptic,
+                                   MAX77843_SYS_REG_MAINCTRL1,
+                                   MAX77843_MAINCTRL1_BIASEN_MASK,
+                                   on << MAINCTRL1_BIASEN_SHIFT);
+        if (error) {
+                dev_err(haptic->dev, "failed to %s bias: %d\n",
+                        on ? "enable" : "disable", error);
+                return error;
+        }
+
+        return 0;
+}
+
+static int max77843_haptic_config(struct max77843_haptic *haptic, bool enable)
+{
+        unsigned int value;
+        int error;
+
+        value = (haptic->type << MCONFIG_MODE_SHIFT) |
+                (enable << MCONFIG_MEN_SHIFT) |
+                (haptic->pwm_divisor << MCONFIG_PDIV_SHIFT);
+
+        error = regmap_write(haptic->regmap_haptic,
+                             MAX77843_HAP_REG_MCONFIG, value);
+        if (error) {
+                dev_err(haptic->dev,
+                        "failed to update haptic config: %d\n", error);
+                return error;
+        }
+
+        return 0;
+}
+
+static int max77843_haptic_enable(struct max77843_haptic *haptic)
+{
+        int error;
+
+        if (haptic->active)
+                return 0;
+
+        error = pwm_enable(haptic->pwm_dev);
+        if (error) {
+                dev_err(haptic->dev,
+                        "failed to enable pwm device: %d\n", error);
+                return error;
+        }
+
+        error = max77843_haptic_config(haptic, true);
+        if (error)
+                goto err_config;
+
+        haptic->active = true;
+
+        return 0;
+
+err_config:
+        pwm_disable(haptic->pwm_dev);
+
+        return error;
+}
+
+static int max77843_haptic_disable(struct max77843_haptic *haptic)
+{
+        int error;
+
+        if (!haptic->active)
+                return 0;
+
+        error = max77843_haptic_config(haptic, false);
+        if (error)
+                return error;
+
+        pwm_disable(haptic->pwm_dev);
+
+        haptic->active = false;
+
+        return 0;
+}
+
+static void max77843_haptic_play_work(struct work_struct *work)
+{
+        struct max77843_haptic *haptic =
+                        container_of(work, struct max77843_haptic, work);
+        int error;