3 files changed, 369 insertions, 0 deletions

diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index 36382e5b7703..23297ab6163f 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -144,6 +144,17 @@ config INPUT_M68K_BEEP
         tristate "M68k Beeper support"
         depends on M68K
 
+config INPUT_MAX77693_HAPTIC
+        tristate "MAXIM MAX77693 haptic controller support"
+        depends on MFD_MAX77693 && PWM
+        select INPUT_FF_MEMLESS
+        help
+          This option enables support for the haptic controller on
+          MAXIM MAX77693 chip.
+
+          To compile this driver as module, choose M here: the
+          module will be called max77693-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 e8b84d2c845f..19c760361f80 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -37,6 +37,7 @@ obj-$(CONFIG_INPUT_IXP4XX_BEEPER)	+= ixp4xx-beeper.o
 obj-$(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_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/max77693-haptic.c b/drivers/input/misc/max77693-haptic.c
new file mode 100644
index 000000000000..d605db4d2f39
--- /dev/null
+++ b/drivers/input/misc/max77693-haptic.c
@@ -0,0 +1,357 @@
+/*
+ * MAXIM MAX77693 Haptic device driver
+ *
+ * Copyright (C) 2014 Samsung Electronics
+ * Jaewon Kim <jaewon02.kim@samsung.com>
+ *
+ * This program is not provided / owned by Maxim Integrated Products.
+ *
+ * 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/init.h>
+#include <linux/i2c.h>
+#include <linux/regmap.h>
+#include <linux/input.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/pwm.h>
+#include <linux/slab.h>
+#include <linux/workqueue.h>
+#include <linux/regulator/consumer.h>
+#include <linux/mfd/max77693.h>
+#include <linux/mfd/max77693-private.h>
+
+#define MAX_MAGNITUDE_SHIFT     16
+
+enum max77693_haptic_motor_type {
+        MAX77693_HAPTIC_ERM = 0,
+        MAX77693_HAPTIC_LRA,
+};
+
+enum max77693_haptic_pulse_mode {
+        MAX77693_HAPTIC_EXTERNAL_MODE = 0,
+        MAX77693_HAPTIC_INTERNAL_MODE,
+};
+
+enum max77693_haptic_pwm_divisor {
+        MAX77693_HAPTIC_PWM_DIVISOR_32 = 0,
+        MAX77693_HAPTIC_PWM_DIVISOR_64,
+        MAX77693_HAPTIC_PWM_DIVISOR_128,
+        MAX77693_HAPTIC_PWM_DIVISOR_256,
+};
+
+struct max77693_haptic {
+        struct regmap *regmap_pmic;
+        struct regmap *regmap_haptic;
+        struct device *dev;
+        struct input_dev *input_dev;
+        struct pwm_device *pwm_dev;
+        struct regulator *motor_reg;
+
+        bool enabled;
+        bool suspend_state;
+        unsigned int magnitude;
+        unsigned int pwm_duty;
+        enum max77693_haptic_motor_type type;
+        enum max77693_haptic_pulse_mode mode;
+        enum max77693_haptic_pwm_divisor pwm_divisor;
+
+        struct work_struct work;
+};
+
+static int max77693_haptic_set_duty_cycle(struct max77693_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 max77693_haptic_configure(struct max77693_haptic *haptic,
+                                     bool enable)
+{
+        unsigned int value;
+        int error;
+
+        value = ((haptic->type << MAX77693_CONFIG2_MODE) |
+                (enable << MAX77693_CONFIG2_MEN) |
+                (haptic->mode << MAX77693_CONFIG2_HTYP) |
+                (haptic->pwm_divisor));
+
+        error = regmap_write(haptic->regmap_haptic,
+                             MAX77693_HAPTIC_REG_CONFIG2, value);
+        if (error) {
+                dev_err(haptic->dev,
+                        "failed to update haptic config: %d\n", error);
+                return error;
+        }
+
+        return 0;
+}
+
+static int max77693_haptic_lowsys(struct max77693_haptic *haptic, bool enable)
+{
+        int error;
+
+        error = regmap_update_bits(haptic->regmap_pmic,
+                                   MAX77693_PMIC_REG_LSCNFG,
+                                   MAX77693_PMIC_LOW_SYS_MASK,
+                                   enable << MAX77693_PMIC_LOW_SYS_SHIFT);
+        if (error) {
+                dev_err(haptic->dev, "cannot update pmic regmap: %d\n", error);
+                return error;
+        }
+
+        return 0;
+}
+
+static void max77693_haptic_enable(struct max77693_haptic *haptic)
+{
+        int error;
+
+        if (haptic->enabled)
+                return;
+
+        error = pwm_enable(haptic->pwm_dev);
+        if (error) {
+                dev_err(haptic->dev,
+                        "failed to enable haptic pwm device: %d\n", error);
+                return;
+        }
+
+        error = max77693_haptic_lowsys(haptic, true);
+        if (error)
+                goto err_enable_lowsys;
+
+        error = max77693_haptic_configure(haptic, true);
+        if (error)
+                goto err_enable_config;
+
+        haptic->enabled = true;
+
+        return;
+
+err_enable_config:
+        max77693_haptic_lowsys(haptic, false);
+err_enable_lowsys:
+        pwm_disable(haptic->pwm_dev);
+}
+
+static void max77693_haptic_disable(struct max77693_haptic *haptic)
+{
+        int error;
+
+        if (haptic->enabled)
+                return;
+
+        error = max77693_haptic_configure(haptic, false);
+        if (error)
+                return;
+
+        error = max77693_haptic_lowsys(haptic, false);
+        if (error)
+                goto err_disable_lowsys;
+
+        pwm_disable(haptic->pwm_dev);
+        haptic->enabled = false;
+
+        return;
+
+err_disable_lowsys:
+        max77693_haptic_configure(haptic, true);