[PATCH v7 0/3] Add regulator-haptic driver

[PATCH v7 0/3] Add regulator-haptic driver

[Jaewon Kim]

This patch series adds regulator-haptic driver.
The regulator-haptic has haptic motor and it is controlled by
voltage of regulator via force feedback framework.

Changes in v7:
 - move platform_data or of_node check.
 - prevent to start playing effect when kernel entering suspend state.

Changes in v6:
 - prevent racing condition

Changes in v5:
 - give preference to platform data

Changes in v4:
 - _regulator_get() -> _regulator_get_exclusive()

Changes in v3:
 - fix typo in Documentation
 - add define in header file

Changes in v2:
 - remove driver owner
 - merge enable/disable function
 - support platform data
 - fix wrong suspends_state check in regulator_haptic_resume()

Jaewon Kim (3):
  Input: add regulator haptic driver
  ARM: dts: exynos3250-rinato: Add regulator-haptic node for haptics
  ARM: dts: exynos3250-monk: Add regulator-haptic node for haptics

 .../devicetree/bindings/input/regulator-haptic.txt |   21 ++
 arch/arm/boot/dts/exynos3250-monk.dts              |    7 +
 arch/arm/boot/dts/exynos3250-rinato.dts            |    7 +
 drivers/input/misc/Kconfig                         |   11 +
 drivers/input/misc/Makefile                        |    1 +
 drivers/input/misc/regulator-haptic.c              |  247 ++++++++++++++++++++
 include/linux/platform_data/regulator-haptic.h     |   29 +++
 7 files changed, 323 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/input/regulator-haptic.txt
 create mode 100644 drivers/input/misc/regulator-haptic.c
 create mode 100644 include/linux/platform_data/regulator-haptic.h

-- 
1.7.9.5

[PATCH v7 1/3] Input: add regulator haptic driver

[Jaewon Kim]

This patch adds support for haptic driver controlled by
voltage of regulator. And this driver support for
Force Feedback interface from input framework

Signed-off-by: Jaewon Kim <jaewon02.kim@samsung.com>
Signed-off-by: Hyunhee Kim <hyunhee.kim@samsung.com>
Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
Tested-by: Chanwoo Choi <cw00.choi@samsung.com>
Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com>
Reviewed-by: Pankaj Dubey <pankaj.dubey@samsung.com>
---
 .../devicetree/bindings/input/regulator-haptic.txt |   21 ++
 drivers/input/misc/Kconfig                         |   11 +
 drivers/input/misc/Makefile                        |    1 +
 drivers/input/misc/regulator-haptic.c              |  247 ++++++++++++++++++++
 include/linux/platform_data/regulator-haptic.h     |   29 +++
 5 files changed, 309 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/input/regulator-haptic.txt
 create mode 100644 drivers/input/misc/regulator-haptic.c
 create mode 100644 include/linux/platform_data/regulator-haptic.h

diff --git a/Documentation/devicetree/bindings/input/regulator-haptic.txt b/Documentation/devicetree/bindings/input/regulator-haptic.txt
new file mode 100644
index 0000000..3ed1c7e
--- /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 23297ab..e5e556d 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -394,6 +394,17 @@ 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"
+	select INPUT_FF_MEMLESS
+	help
+	  This option enables device driver support for the haptic controlled
+	  by 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 19c7603..1f135af 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 0000000..16f5ec8
--- /dev/null
+++ b/drivers/input/misc/regulator-haptic.c
@@ -0,0 +1,247 @@
+/*
+ * 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 enabled;
+	bool suspend_state;
+	unsigned int max_volt;
+	unsigned int min_volt;
+	unsigned int intensity;
+	unsigned int magnitude;
+};
+
+static void regulator_haptic_enable(struct regulator_haptic *haptic, bool state)
+{
+	int error;
+
+	if (haptic->enabled == state)
+		return;
+
+	error = state ? regulator_enable(haptic->regulator) :
+		regulator_disable(haptic->regulator);
+	if (error) {
+		dev_err(haptic->dev, "cannot enable regulator\n");
+		return;
+	}
+
+	haptic->enabled = state;
+}
+
+static void regulator_haptic_work(struct work_struct *work)
+{
+	struct regulator_haptic *haptic = container_of(work,
+					struct regulator_haptic, work);
+	int error;
+
+	mutex_lock(&haptic->mutex);
+
+	if (haptic->suspend_state)
+		goto err;
+
+	error = regulator_set_voltage(haptic->regulator,
+			haptic->intensity + haptic->min_volt, haptic->max_volt);
+	if (error) {
+		dev_err(haptic->dev, "cannot set regulator voltage\n");
+		goto err;
+	}
+
+	if (haptic->magnitude)
+		regulator_haptic_enable(haptic, true);
+	else
+		regulator_haptic_enable(haptic, false);
+
+err:
+	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);
+	u64 volt_mag_multi;
+
+	haptic->magnitude = effect->u.rumble.strong_magnitude;
+	if (!haptic->magnitude)
+		haptic->magnitude = effect->u.rumble.weak_magnitude;
+
+
+	volt_mag_multi = (u64)(haptic->max_volt - haptic->min_volt) *
+					haptic->magnitude;
+	haptic->intensity = (unsigned int)(volt_mag_multi >>
+					MAX_MAGNITUDE_SHIFT);
+
+	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_enable(haptic, false);
+}
+
+static int regulator_haptic_get_data(struct platform_device *pdev)
+{
+	struct device_node *node = pdev->dev.of_node;
+	struct regulator_haptic_data *data = dev_get_platdata(&pdev->dev);
+	struct regulator_haptic *haptic = platform_get_drvdata(pdev);
+	int error;
+
+	if (data) {
+		haptic->max_volt = data->max_volt;
+		haptic->min_volt = data->min_volt;
+	} else if (pdev->dev.of_node) {
+		error = of_property_read_u32(node, "max-microvolt",
+				&haptic->max_volt);
+		if (error) {
+			dev_err(&pdev->dev, "cannot parse max-microvolt\n");
+			return error;
+		}
+
+		error = of_property_read_u32(node, "min-microvolt",
+				&haptic->min_volt);
+		if (error) {
+			dev_err(&pdev->dev, "cannot parse min-microvolt\n");
+			return error;
+		}
+	} else {
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+static int regulator_haptic_probe(struct platform_device *pdev)
+{
+	struct regulator_haptic *haptic;
+	struct input_dev *input_dev;
+	int error;
+
+	haptic = devm_kzalloc(&pdev->dev, sizeof(*haptic), GFP_KERNEL);
+	if (!haptic)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, haptic);
+	haptic->dev = &pdev->dev;
+	haptic->enabled = false;
+	haptic->suspend_state = false;
+	mutex_init(&haptic->mutex);
+	INIT_WORK(&haptic->work, regulator_haptic_work);
+
+	error = regulator_haptic_get_data(pdev);
+	if (error) {
+		dev_err(&pdev->dev, "failed to get voltage value\n");
+		return error;
+	}
+
+	haptic->regulator = devm_regulator_get_exclusive(&pdev->dev, "haptic");
+	if (IS_ERR(haptic->regulator)) {
+		dev_err(&pdev->dev, "failed to get regulator\n");
+		return PTR_ERR(haptic->regulator);
+	}
+
+	input_dev = devm_input_allocate_device(&pdev->dev);
+	if (!input_dev)
+		return	-ENOMEM;
+
+	haptic->input_dev = input_dev;
+	haptic->input_dev->name = "regulator-haptic";
+	haptic->input_dev->dev.parent = &pdev->dev;
+	haptic->input_dev->close = regulator_haptic_close;
+	input_set_drvdata(haptic->input_dev, haptic);
+	input_set_capability(haptic->input_dev, EV_FF, FF_RUMBLE);
+
+	error = input_ff_create_memless(input_dev, NULL,
+			      regulator_haptic_play_effect);
+	if (error) {
+		dev_err(&pdev->dev, "failed to create force-feedback\n");
+		return error;
+	}
+
+	error = input_register_device(haptic->input_dev);
+	if (error) {
+		dev_err(&pdev->dev, "failed to register input device\n");
+		return error;
+	}
+
+	return 0;
+}
+
+static int __maybe_unused regulator_haptic_suspend(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct regulator_haptic *haptic = platform_get_drvdata(pdev);
+
+	mutex_lock(&haptic->mutex);
+
+	haptic->suspend_state = true;
+
+	if (haptic->enabled)
+		regulator_haptic_enable(haptic, false);
+
+	mutex_unlock(&haptic->mutex);
+
+	return 0;
+}
+
+static int __maybe_unused regulator_haptic_resume(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct regulator_haptic *haptic = platform_get_drvdata(pdev);
+
+	haptic->suspend_state = false;
+
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(regulator_haptic_pm_ops,
+		regulator_haptic_suspend, regulator_haptic_resume);
+
+static struct of_device_id regulator_haptic_dt_match[] = {
+	{ .compatible = "regulator-haptic" },
+	{ /* sentinel */ },
+};
+
+static struct platform_driver regulator_haptic_driver = {
+	.probe		= regulator_haptic_probe,
+	.driver		= {
+		.name		= "regulator-haptic",
+		.of_match_table = regulator_haptic_dt_match,
+		.pm		= &regulator_haptic_pm_ops,
+	},
+};
+module_platform_driver(regulator_haptic_driver);
+
+MODULE_AUTHOR("Jaewon Kim <jaewon02.kim@samsung.com>");
+MODULE_AUTHOR("Hyunhee Kim <hyunhee.kim@samsung.com>");
+MODULE_DESCRIPTION("Regulator haptic driver");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/platform_data/regulator-haptic.h b/include/linux/platform_data/regulator-haptic.h
new file mode 100644
index 0000000..5658e58
--- /dev/null
+++ b/include/linux/platform_data/regulator-haptic.h
@@ -0,0 +1,29 @@
+/*
+ * Regulator Haptic Platform Data
+ *
+ * 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.
+ */
+
+#ifndef _REGULATOR_HAPTIC_H
+#define _REGULATOR_HAPTIC_H
+
+/*
+ * struct regulator_haptic_data - Platform device data
+ *
+ * @max_volt: maximum voltage value supplied to the haptic motor.
+ *		<The unit of the voltage is a micro>
+ * @min_volt: minimum voltage value supplied to the haptic motor.
+ *		<The unit of the voltage is a micro>
+ */
+struct regulator_haptic_data {
+	unsigned int max_volt;
+	unsigned int min_volt;
+};
+
+#endif /* _REGULATOR_HAPTIC_H */
-- 
1.7.9.5

[PATCH v7 2/3] ARM: dts: exynos3250-rinato: Add regulator-haptic node for haptics

[Jaewon Kim]

This patch adds regulator-haptic device node controlled by regulator.

Signed-off-by: Jaewon Kim <jaewon02.kim@samsung.com>
Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com>
---
 arch/arm/boot/dts/exynos3250-rinato.dts |    7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/arm/boot/dts/exynos3250-rinato.dts b/arch/arm/boot/dts/exynos3250-rinato.dts
index 80aa8b4..0e3d499 100644
--- a/arch/arm/boot/dts/exynos3250-rinato.dts
+++ b/arch/arm/boot/dts/exynos3250-rinato.dts
@@ -100,6 +100,13 @@
 			};
 		};
 	};
+
+	haptics {
+		compatible = "regulator-haptic";
+		haptic-supply = <&motor_reg>;
+		min-microvolt = <1100000>;
+		max-microvolt = <2700000>;
+	};
 };
 
 &adc {
-- 
1.7.9.5

[PATCH v7 3/3] ARM: dts: exynos3250-monk: Add regulator-haptic node for haptics

[Jaewon Kim]

This patch adds regulator-haptic device node controlled by regulator.

Signed-off-by: Jaewon Kim <jaewon02.kim@samsung.com>
---
 arch/arm/boot/dts/exynos3250-monk.dts |    7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/arm/boot/dts/exynos3250-monk.dts b/arch/arm/boot/dts/exynos3250-monk.dts
index 24822aa..7102d88 100644
--- a/arch/arm/boot/dts/exynos3250-monk.dts
+++ b/arch/arm/boot/dts/exynos3250-monk.dts
@@ -109,6 +109,13 @@
 			};
 		};
 	};
+
+	haptics {
+		compatible = "regulator-haptic";
+		haptic-supply = <&motor_reg>;
+		min-microvolt = <1100000>;
+		max-microvolt = <2700000>;
+	};
 };
 
 &adc {
-- 
1.7.9.5

Re: [PATCH v7 1/3] Input: add regulator haptic driver

[Dmitry Torokhov]

HI Jaewon,

On Wed, Dec 17, 2014 at 12:35:06PM +0900, Jaewon Kim wrote:
> This patch adds support for haptic driver controlled by
> voltage of regulator. And this driver support for
> Force Feedback interface from input framework
> 
> Signed-off-by: Jaewon Kim <jaewon02.kim@samsung.com>
> Signed-off-by: Hyunhee Kim <hyunhee.kim@samsung.com>
> Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
> Tested-by: Chanwoo Choi <cw00.choi@samsung.com>
> Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com>
> Reviewed-by: Pankaj Dubey <pankaj.dubey@samsung.com>

Does the driver still work if you apply the patch below on top of yours?

Thanks.

-- 
Dmitry


Input: regulator-haptics - misc changes

From: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
---
 drivers/input/misc/Kconfig            |    4 -
 drivers/input/misc/regulator-haptic.c |  164 ++++++++++++++++++++-------------
 2 files changed, 100 insertions(+), 68 deletions(-)

diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index e5e556d..0b652c5 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -395,11 +395,11 @@ config INPUT_CM109
 	  called cm109.
 
 config INPUT_REGULATOR_HAPTIC
-	tristate "regulator haptics support"
+	tristate "Regulator haptics support"
 	select INPUT_FF_MEMLESS
 	help
 	  This option enables device driver support for the haptic controlled
-	  by regulator. This driver supports ff-memless interface
+	  by a regulator. This driver supports ff-memless interface
 	  from input framework.
 
 	  To compile this driver as a module, choose M here: the
diff --git a/drivers/input/misc/regulator-haptic.c b/drivers/input/misc/regulator-haptic.c
index 16f5ec8..9426221 100644
--- a/drivers/input/misc/regulator-haptic.c
+++ b/drivers/input/misc/regulator-haptic.c
@@ -28,55 +28,78 @@ struct regulator_haptic {
 	struct work_struct work;
 	struct mutex mutex;
 
-	bool enabled;
-	bool suspend_state;
+	bool active;
+	bool suspended;
+
 	unsigned int max_volt;
 	unsigned int min_volt;
-	unsigned int intensity;
 	unsigned int magnitude;
 };
 
-static void regulator_haptic_enable(struct regulator_haptic *haptic, bool state)
+static int regulator_haptic_toggle(struct regulator_haptic *haptic, bool on)
 {
 	int error;
 
-	if (haptic->enabled == state)
-		return;
+	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;
+	}
 
-	error = state ? regulator_enable(haptic->regulator) :
-		regulator_disable(haptic->regulator);
+	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 enable regulator\n");
-		return;
+		dev_err(haptic->dev, "cannot set regulator voltage to %d: %d\n",
+			intensity + haptic->min_volt, error);
+		return error;
 	}
 
-	haptic->enabled = state;
+	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->suspend_state)
-		goto err;
+	if (haptic->suspended)
+		goto out;
 
-	error = regulator_set_voltage(haptic->regulator,
-			haptic->intensity + haptic->min_volt, haptic->max_volt);
-	if (error) {
-		dev_err(haptic->dev, "cannot set regulator voltage\n");
-		goto err;
-	}
+	magnitude = ACCESS_ONCE(haptic->magnitude);
 
-	if (haptic->magnitude)
-		regulator_haptic_enable(haptic, true);
-	else
-		regulator_haptic_enable(haptic, false);
+	error = regulator_haptic_set_voltage(haptic, magnitude);
+	if (error)
+		goto out;
 
-err:
+	regulator_haptic_toggle(haptic, magnitude != 0);
+
+out:
 	mutex_unlock(&haptic->mutex);
 }
 
@@ -84,18 +107,11 @@ static int regulator_haptic_play_effect(struct input_dev *input, void *data,
 					struct ff_effect *effect)
 {
 	struct regulator_haptic *haptic = input_get_drvdata(input);
-	u64 volt_mag_multi;
 
 	haptic->magnitude = effect->u.rumble.strong_magnitude;
 	if (!haptic->magnitude)
 		haptic->magnitude = effect->u.rumble.weak_magnitude;
 
-
-	volt_mag_multi = (u64)(haptic->max_volt - haptic->min_volt) *
-					haptic->magnitude;
-	haptic->intensity = (unsigned int)(volt_mag_multi >>
-					MAX_MAGNITUDE_SHIFT);
-
 	schedule_work(&haptic->work);
 
 	return 0;
@@ -106,35 +122,32 @@ static void regulator_haptic_close(struct input_dev *input)
 	struct regulator_haptic *haptic = input_get_drvdata(input);
 
 	cancel_work_sync(&haptic->work);
-	regulator_haptic_enable(haptic, false);
+	regulator_haptic_set_voltage(haptic, 0);
+	regulator_haptic_toggle(haptic, false);
 }
 
-static int regulator_haptic_get_data(struct platform_device *pdev)
+static int __maybe_unused
+regulator_haptic_parse_dt(struct device *dev, struct regulator_haptic *haptic)
 {
-	struct device_node *node = pdev->dev.of_node;
-	struct regulator_haptic_data *data = dev_get_platdata(&pdev->dev);
-	struct regulator_haptic *haptic = platform_get_drvdata(pdev);
+	struct device_node *node;
 	int error;
 
-	if (data) {
-		haptic->max_volt = data->max_volt;
-		haptic->min_volt = data->min_volt;
-	} else if (pdev->dev.of_node) {
-		error = of_property_read_u32(node, "max-microvolt",
-				&haptic->max_volt);
-		if (error) {
-			dev_err(&pdev->dev, "cannot parse max-microvolt\n");
-			return error;
-		}
+	node = dev->of_node;
+	if(!node) {
+		dev_err(dev, "Missing dveice tree data\n");
+		return -EINVAL;
+	}
 
-		error = of_property_read_u32(node, "min-microvolt",
-				&haptic->min_volt);
-		if (error) {
-			dev_err(&pdev->dev, "cannot parse min-microvolt\n");
-			return error;
-		}
-	} else {
-		return -ENODEV;
+	error = of_property_read_u32(node, "max-microvolt", &haptic->max_volt);
+	if (error) {
+		dev_err(dev, "cannot parse max-microvolt\n");
+		return error;
+	}
+
+	error = of_property_read_u32(node, "min-microvolt", &haptic->min_volt);
+	if (error) {
+		dev_err(dev, "cannot parse min-microvolt\n");
+		return error;
 	}
 
 	return 0;
@@ -142,6 +155,7 @@ static int regulator_haptic_get_data(struct platform_device *pdev)
 
 static int regulator_haptic_probe(struct platform_device *pdev)
 {
+	const struct regulator_haptic_data *pdata = dev_get_platdata(&pdev->dev);
 	struct regulator_haptic *haptic;
 	struct input_dev *input_dev;
 	int error;
@@ -152,15 +166,19 @@ static int regulator_haptic_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, haptic);
 	haptic->dev = &pdev->dev;
-	haptic->enabled = false;
-	haptic->suspend_state = false;
 	mutex_init(&haptic->mutex);
 	INIT_WORK(&haptic->work, regulator_haptic_work);
 
-	error = regulator_haptic_get_data(pdev);
-	if (error) {
-		dev_err(&pdev->dev, "failed to get voltage value\n");
-		return error;
+	if (pdata) {
+		haptic->max_volt = pdata->max_volt;
+		haptic->min_volt = pdata->min_volt;
+	} else if (IS_ENABLED(CONFIG_OF)) {
+		error = regulator_haptic_parse_dt(&pdev->dev, haptic);
+		if (error)
+			return error;
+	} else {
+		dev_err(&pdev->dev, "Missing platform data\n");
+		return -EINVAL;
 	}
 
 	haptic->regulator = devm_regulator_get_exclusive(&pdev->dev, "haptic");
@@ -181,7 +199,7 @@ static int regulator_haptic_probe(struct platform_device *pdev)
 	input_set_capability(haptic->input_dev, EV_FF, FF_RUMBLE);
 
 	error = input_ff_create_memless(input_dev, NULL,
-			      regulator_haptic_play_effect);
+					regulator_haptic_play_effect);
 	if (error) {
 		dev_err(&pdev->dev, "failed to create force-feedback\n");
 		return error;
@@ -200,13 +218,16 @@ static int __maybe_unused regulator_haptic_suspend(struct device *dev)
 {
 	struct platform_device *pdev = to_platform_device(dev);
 	struct regulator_haptic *haptic = platform_get_drvdata(pdev);
+	int error;
 
-	mutex_lock(&haptic->mutex);
+	error = mutex_lock_interruptible(&haptic->mutex);
+	if (error)
+		return error;
 
-	haptic->suspend_state = true;
+	regulator_haptic_set_voltage(haptic, 0);
+	regulator_haptic_toggle(haptic, false);
 
-	if (haptic->enabled)
-		regulator_haptic_enable(haptic, false);
+	haptic->suspended = true;
 
 	mutex_unlock(&haptic->mutex);
 
@@ -217,8 +238,19 @@ static int __maybe_unused regulator_haptic_resume(struct device *dev)
 {
 	struct platform_device *pdev = to_platform_device(dev);
 	struct regulator_haptic *haptic = platform_get_drvdata(pdev);
+	unsigned int magnitude;
+
+	mutex_lock(&haptic->mutex);
+
+	haptic->suspended = false;
 
-	haptic->suspend_state = false;
+	magnitude = ACCESS_ONCE(haptic->magnitude);
+	if (magnitude) {
+		regulator_haptic_set_voltage(haptic, magnitude);
+		regulator_haptic_toggle(haptic, true);
+	}
+
+	mutex_unlock(&haptic->mutex);
 
 	return 0;
 }

Re: [PATCH v7 1/3] Input: add regulator haptic driver

[Jaewon Kim]

Hi Dmity,

2014년 12월 18일 07:06에 Dmitry Torokhov 이(가) 쓴 글:
> HI Jaewon,
>
> On Wed, Dec 17, 2014 at 12:35:06PM +0900, Jaewon Kim wrote:
>> This patch adds support for haptic driver controlled by
>> voltage of regulator. And this driver support for
>> Force Feedback interface from input framework
>>
>> Signed-off-by: Jaewon Kim <jaewon02.kim@samsung.com>
>> Signed-off-by: Hyunhee Kim <hyunhee.kim@samsung.com>
>> Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
>> Tested-by: Chanwoo Choi <cw00.choi@samsung.com>
>> Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com>
>> Reviewed-by: Pankaj Dubey <pankaj.dubey@samsung.com>
> Does the driver still work if you apply the patch below on top of yours?
>
> Thanks.
>

Yes, there is no problem to apply this one first.

Thanks to review my patches.

Thanks
Jaewon Kim

Re: [PATCH v7 1/3] Input: add regulator haptic driver

[Dmitry Torokhov]

On Thursday, December 18, 2014 10:17:42 AM Jaewon Kim wrote:
> Hi Dmity,
> 
> 2014년 12월 18일 07:06에 Dmitry Torokhov 이(가) 쓴 글:
> > HI Jaewon,
> > 
> > On Wed, Dec 17, 2014 at 12:35:06PM +0900, Jaewon Kim wrote:
> >> This patch adds support for haptic driver controlled by
> >> voltage of regulator. And this driver support for
> >> Force Feedback interface from input framework
> >> 
> >> Signed-off-by: Jaewon Kim <jaewon02.kim@samsung.com>
> >> Signed-off-by: Hyunhee Kim <hyunhee.kim@samsung.com>
> >> Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
> >> Tested-by: Chanwoo Choi <cw00.choi@samsung.com>
> >> Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com>
> >> Reviewed-by: Pankaj Dubey <pankaj.dubey@samsung.com>
> > 
> > Does the driver still work if you apply the patch below on top of yours?
> > 
> > Thanks.
> 
> Yes, there is no problem to apply this one first.

Thank you. Then I'll fold it into yours and queue the driver for the next 
release.

Thanks.

-- 
Dmitry
--
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