Date:	Wed, 07 Oct 2009 15:18:22 +0900
From:	Kyungmin Park <kyungmin.park@...sung.com>
To:	linux-kernel@...r.kernel.org, linux-input@...r.kernel.org
Cc:	soni.trilok@...il.com
Subject: [PATCH 5/6] haptic: Samsung SoCs PWM controlled haptic support

Samsung SoCs PWM and gpio connected haptic device support
It's tested on s3c64xx, s5pc1xx

Signed-off-by: Kyungmin Park <kyungmin.park@...sung.com>
---
 drivers/haptic/Kconfig              |    9 +
 drivers/haptic/Makefile             |    3 +
 drivers/haptic/haptic-samsung-pwm.c |  377 +++++++++++++++++++++++++++++++++++
 3 files changed, 389 insertions(+), 0 deletions(-)
 create mode 100644 drivers/haptic/haptic-samsung-pwm.c

diff --git a/drivers/haptic/Kconfig b/drivers/haptic/Kconfig
index 656b022..1e9849c 100644
--- a/drivers/haptic/Kconfig
+++ b/drivers/haptic/Kconfig
@@ -11,4 +11,13 @@ config HAPTIC_CLASS
 	help
 	  This option enables the haptic sysfs class in /sys/class/haptic.
 
+comment "Haptic drivers"
+
+config HAPTIC_SAMSUNG_PWM
+	tristate "Haptic Support for SAMSUNG PWM-controlled haptic (ISA1000)"
+	depends on HAPTIC_CLASS && (ARCH_S3C64XX || ARCH_S5PC1XX)
+	help
+	  This options enables support for haptic connected to GPIO lines
+	  controlled by a PWM timer on SAMSUNG CPUs.
+
 endif	# HAPTIC
diff --git a/drivers/haptic/Makefile b/drivers/haptic/Makefile
index d30f8cd..c691f7d 100644
--- a/drivers/haptic/Makefile
+++ b/drivers/haptic/Makefile
@@ -1,2 +1,5 @@
 # Haptic Core
 obj-$(CONFIG_HAPTIC_CLASS)		+= haptic-class.o
+
+# Drivers
+obj-$(CONFIG_HAPTIC_SAMSUNG_PWM)	+= haptic-samsung-pwm.o
diff --git a/drivers/haptic/haptic-samsung-pwm.c b/drivers/haptic/haptic-samsung-pwm.c
new file mode 100644
index 0000000..df6f30d
--- /dev/null
+++ b/drivers/haptic/haptic-samsung-pwm.c
@@ -0,0 +1,377 @@
+/*
+ *  drivers/haptic/haptic-samsung-pwm.c
+ *
+ *  Copyright (C) 2008 Samsung Electronics
+ *  Kyungmin Park <kyungmin.park@...sung.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/module.h>
+#include <linux/platform_device.h>
+#include <linux/ctype.h>
+#include <linux/haptic.h>
+#include <linux/workqueue.h>
+#include <linux/gpio.h>
+#include <linux/err.h>
+#include <linux/pwm.h>
+#include <linux/timer.h>
+
+#include "haptic.h"
+
+#define PWM_HAPTIC_PERIOD		44640
+#define PWM_HAPTIC_DEFAULT_LEVEL		2
+
+static int haptic_levels[] = { 18360, 14880, 10860, 5280, 540, };
+
+struct samsung_pwm_haptic {
+	struct haptic_classdev cdev;
+	struct work_struct work;
+	struct haptic_platform_data *pdata;
+	struct pwm_device *pwm;
+	struct timer_list timer;
+
+	int enable;
+	int powered;
+
+	int level;
+	int level_max;
+};
+
+static inline struct samsung_pwm_haptic *cdev_to_samsung_pwm_haptic(
+		struct haptic_classdev *haptic_cdev)
+{
+	return container_of(haptic_cdev, struct samsung_pwm_haptic, cdev);
+}
+
+static void samsung_pwm_haptic_power_on(struct samsung_pwm_haptic *haptic)
+{
+	if (haptic->powered)
+		return;
+	haptic->powered = 1;
+
+	if (gpio_is_valid(haptic->pdata->gpio))
+		gpio_set_value(haptic->pdata->gpio, 1);
+
+	pwm_enable(haptic->pwm);
+}
+
+static void samsung_pwm_haptic_power_off(struct samsung_pwm_haptic *haptic)
+{
+	if (!haptic->powered)
+		return;
+	haptic->powered = 0;
+
+	if (gpio_is_valid(haptic->pdata->gpio))
+		gpio_set_value(haptic->pdata->gpio, 0);
+
+	pwm_disable(haptic->pwm);
+}
+
+static int samsung_pwm_haptic_set_pwm_cycle(struct samsung_pwm_haptic *haptic)
+{
+	int duty = haptic_levels[haptic->level];
+	return pwm_config(haptic->pwm, duty, PWM_HAPTIC_PERIOD);
+}
+
+static void samsung_pwm_haptic_work(struct work_struct *work)
+{
+	struct samsung_pwm_haptic *haptic;
+	int r;
+
+	haptic = container_of(work, struct samsung_pwm_haptic, work);
+
+	if (haptic->enable) {
+		r = samsung_pwm_haptic_set_pwm_cycle(haptic);
+		if (r) {
+			dev_dbg(haptic->cdev.dev, "set_pwm_cycle failed\n");
+			return;
+		}
+		samsung_pwm_haptic_power_on(haptic);
+	} else {
+		samsung_pwm_haptic_power_off(haptic);
+	}
+}
+
+static void samsung_pwm_haptic_timer(unsigned long data)
+{
+	struct samsung_pwm_haptic *haptic = (struct samsung_pwm_haptic *)data;
+
+	haptic->enable = 0;
+	samsung_pwm_haptic_power_off(haptic);
+}
+
+static void samsung_pwm_haptic_set(struct haptic_classdev *haptic_cdev,
+				enum haptic_value value)
+{
+	struct samsung_pwm_haptic *haptic =
+		cdev_to_samsung_pwm_haptic(haptic_cdev);
+
+	switch (value) {
+	case HAPTIC_OFF:
+		haptic->enable = 0;
+		break;
+	case HAPTIC_HALF:
+	case HAPTIC_FULL:
+	default:
+		haptic->enable = 1;
+		break;
+	}
+
+	schedule_work(&haptic->work);
+}
+
+static enum haptic_value samsung_pwm_haptic_get(
+		struct haptic_classdev *haptic_cdev)
+{
+	struct samsung_pwm_haptic *haptic =
+		cdev_to_samsung_pwm_haptic(haptic_cdev);
+
+	if (haptic->enable)
+		return HAPTIC_FULL;
+
+	return HAPTIC_OFF;
+}
+
+#define ATTR_DEF_SHOW(name) \
+static ssize_t samsung_pwm_haptic_show_##name(struct device *dev, \
+		struct device_attribute *attr, char *buf) \
+{ \
+	struct haptic_classdev *haptic_cdev = dev_get_drvdata(dev); \
+	struct samsung_pwm_haptic *haptic =\
+		cdev_to_samsung_pwm_haptic(haptic_cdev); \
+ \
+	return sprintf(buf, "%u\n", haptic->name) + 1; \
+}
+
+#define ATTR_DEF_STORE(name) \
+static ssize_t samsung_pwm_haptic_store_##name(struct device *dev, \
+		struct device_attribute *attr, \
+		const char *buf, size_t size) \
+{ \
+	struct haptic_classdev *haptic_cdev = dev_get_drvdata(dev); \
+	struct samsung_pwm_haptic *haptic =\
+		 cdev_to_samsung_pwm_haptic(haptic_cdev); \
+	ssize_t ret = -EINVAL; \
+	unsigned long val; \
+ \
+	ret = strict_strtoul(buf, 10, &val); \
+	if (ret == 0) { \
+		ret = size; \
+		haptic->name = val; \
+		schedule_work(&haptic->work); \
+	} \
+ \
+	return ret; \
+}
+
+ATTR_DEF_SHOW(enable);
+ATTR_DEF_STORE(enable);
+static DEVICE_ATTR(enable, 0644, samsung_pwm_haptic_show_enable,
+		samsung_pwm_haptic_store_enable);
+
+static ssize_t samsung_pwm_haptic_store_level(struct device *dev,
+		struct device_attribute *attr,
+		const char *buf, size_t size)
+{
+	struct haptic_classdev *haptic_cdev = dev_get_drvdata(dev);
+	struct samsung_pwm_haptic *haptic =
+		cdev_to_samsung_pwm_haptic(haptic_cdev);
+	ssize_t ret = -EINVAL;
+	unsigned long val;
+
+	ret = strict_strtoul(buf, 10, &val);
+	if (ret == 0) {
+		ret = size;
+		if (haptic->level_max < val)
+			val = haptic->level_max;
+		haptic->level = val;
+		schedule_work(&haptic->work);
+	}
+
+	return ret;
+}
+ATTR_DEF_SHOW(level);
+static DEVICE_ATTR(level, 0644, samsung_pwm_haptic_show_level,
+		samsung_pwm_haptic_store_level);
+
+ATTR_DEF_SHOW(level_max);
+static DEVICE_ATTR(level_max, 0444, samsung_pwm_haptic_show_level_max, NULL);
+
+static ssize_t samsung_pwm_haptic_store_oneshot(struct device *dev,
+		struct device_attribute *attr,
+		const char *buf, size_t size)
+{
+	struct haptic_classdev *haptic_cdev = dev_get_drvdata(dev);
+	struct samsung_pwm_haptic *haptic =
+		cdev_to_samsung_pwm_haptic(haptic_cdev);
+	ssize_t ret = -EINVAL;
+	unsigned long val;
+
+	ret = strict_strtoul(buf, 10, &val);
+	if (ret == 0) {
+		ret = size;
+		haptic->enable = 1;
+		mod_timer(&haptic->timer, jiffies + val * HZ / 1000);
+		schedule_work(&haptic->work);
+	}
+
+	return ret;
+}
+static DEVICE_ATTR(oneshot, 0200, NULL, samsung_pwm_haptic_store_oneshot);
+
+static struct attribute *haptic_attributes[] = {
+	&dev_attr_enable.attr,
+	&dev_attr_level.attr,
+	&dev_attr_level_max.attr,
+	&dev_attr_oneshot.attr,
+	NULL,
+};
+
+static const struct attribute_group haptic_group = {
+	.attrs = haptic_attributes,
+};
+
+static int __devinit samsung_pwm_haptic_probe(struct platform_device *pdev)
+{
+	struct haptic_platform_data *pdata = pdev->dev.platform_data;
+	struct samsung_pwm_haptic *haptic;
+	int ret;
+
+	haptic = kzalloc(sizeof(struct samsung_pwm_haptic), GFP_KERNEL);
+	if (!haptic) {
+		dev_err(&pdev->dev, "No memory for device\n");
+		return -ENOMEM;
+	}
+
+	platform_set_drvdata(pdev, haptic);
+	haptic->cdev.set = samsung_pwm_haptic_set;
+	haptic->cdev.get = samsung_pwm_haptic_get;
+	haptic->cdev.show_enable = samsung_pwm_haptic_show_enable;
+	haptic->cdev.store_enable = samsung_pwm_haptic_store_enable;
+	haptic->cdev.store_oneshot = samsung_pwm_haptic_store_oneshot;
+	haptic->cdev.show_level = samsung_pwm_haptic_show_level;
+	haptic->cdev.store_level = samsung_pwm_haptic_store_level;
+	haptic->cdev.show_level_max = samsung_pwm_haptic_show_level_max;
+	haptic->cdev.name = pdata->name;
+	haptic->pdata = pdata;
+	haptic->enable = 0;
+	haptic->level = PWM_HAPTIC_DEFAULT_LEVEL;
+	haptic->level_max = ARRAY_SIZE(haptic_levels);
+
+	if (pdata->setup_pin)
+		pdata->setup_pin();
+
+	INIT_WORK(&haptic->work, samsung_pwm_haptic_work);
+
+	/* register our new haptic device */
+	ret = haptic_classdev_register(&pdev->dev, &haptic->cdev);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "haptic_classdev_register failed\n");
+		goto error_classdev;
+	}
+
+	haptic->pwm = pwm_request(pdata->pwm_timer, "haptic");
+	if (IS_ERR(haptic->pwm)) {
+		dev_err(&pdev->dev, "unable to request PWM for haptic\n");
+		ret = PTR_ERR(haptic->pwm);
+		goto err_pwm;
+	} else
+		dev_dbg(&pdev->dev, "got pwm for haptic\n");
+
+	ret = sysfs_create_group(&haptic->cdev.dev->kobj, &haptic_group);
+	if (ret)
+		goto error_enable;
+
+	if (gpio_is_valid(pdata->gpio)) {
+		printk(KERN_INFO "Motor enable gpio %d\n", pdata->gpio);
+		ret = gpio_request(pdata->gpio, "haptic enable");
+		if (ret)
+			goto error_gpio;
+		gpio_direction_output(pdata->gpio, 0);
+	}
+
+	init_timer(&haptic->timer);
+	haptic->timer.data = (unsigned long)haptic;
+	haptic->timer.function = &samsung_pwm_haptic_timer;
+
+	printk(KERN_INFO "samsung %s registed\n", pdata->name);
+	return 0;
+
+error_gpio:
+	gpio_free(pdata->gpio);
+error_enable:
+	sysfs_remove_group(&haptic->cdev.dev->kobj, &haptic_group);
+err_pwm:
+	pwm_free(haptic->pwm);
+error_classdev:
+	haptic_classdev_unregister(&haptic->cdev);
+	kfree(haptic);
+	return ret;
+}
+
+static int __devexit samsung_pwm_haptic_remove(struct platform_device *pdev)
+{
+	struct samsung_pwm_haptic *haptic = platform_get_drvdata(pdev);
+
+	samsung_pwm_haptic_set(&haptic->cdev, HAPTIC_OFF);
+	del_timer_sync(&haptic->timer);
+
+	if (haptic->pdata->gpio)
+		gpio_free(haptic->pdata->gpio);
+	device_remove_file(haptic->cdev.dev, &dev_attr_enable);
+	haptic_classdev_unregister(&haptic->cdev);
+	kfree(haptic);
+	return 0;
+}
+
+#ifdef CONFIG_PM
+static int samsung_pwm_haptic_suspend(
+	struct platform_device *pdev, pm_message_t state)
+{
+	struct samsung_pwm_haptic *haptic = platform_get_drvdata(pdev);
+
+	haptic_classdev_suspend(&haptic->cdev);
+	return 0;
+}
+
+static int samsung_pwm_haptic_resume(struct platform_device *pdev)
+{
+	struct samsung_pwm_haptic *haptic = platform_get_drvdata(pdev);
+
+	haptic_classdev_resume(&haptic->cdev);
+	return 0;
+}
+#else
+#define samsung_pwm_haptic_suspend	NULL
+#define samsung_pwm_haptic_resume	NULL
+#endif
+
+static struct platform_driver samsung_pwm_haptic_driver = {
+	.probe		= samsung_pwm_haptic_probe,
+	.remove		= samsung_pwm_haptic_remove,
+	.suspend	= samsung_pwm_haptic_suspend,
+	.resume		= samsung_pwm_haptic_resume,
+	.driver		= {
+		.name	= "samsung_pwm_haptic",
+		.owner	= THIS_MODULE,
+	},
+};
+
+static int __init samsung_pwm_haptic_init(void)
+{
+	return platform_driver_register(&samsung_pwm_haptic_driver);
+}
+module_init(samsung_pwm_haptic_init);
+
+static void __exit samsung_pwm_haptic_exit(void)
+{
+	platform_driver_unregister(&samsung_pwm_haptic_driver);
+}
+module_exit(samsung_pwm_haptic_exit);
+
+MODULE_AUTHOR("Kyungmin Park <kyungmin.park@...sung.com>");
+MODULE_DESCRIPTION("samsung PWM haptic driver");
+MODULE_LICENSE("GPL");
-- 
1.5.3.3

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