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/*
* Copyright (C) 2012 Spreadtrum Communications Inc.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/leds.h>
#include <linux/err.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <soc/sprd/adi.h>
#include <soc/sprd/adc.h>
#include <soc/sprd/sci_glb_regs.h>
#ifdef CONFIG_HAS_EARLYSUSPEND
#include <linux/earlysuspend.h>
#endif
//#define SPRD_KPLED_DBG
#ifdef SPRD_KPLED_DBG
#define ENTER printk(KERN_INFO "[SPRD_KPLED_DBG] func: %s line: %04d\n", __func__, __LINE__);
#define PRINT_DBG(x...) printk(KERN_INFO "[SPRD_KPLED_DBG] " x)
#define PRINT_INFO(x...) printk(KERN_INFO "[SPRD_KPLED_INFO] " x)
#define PRINT_WARN(x...) printk(KERN_INFO "[SPRD_KPLED_WARN] " x)
#define PRINT_ERR(format,x...) printk(KERN_ERR "[SPRD_KPLED_ERR] func: %s line: %04d info: " format, __func__, __LINE__, ## x)
#else
#define ENTER
#define PRINT_DBG(x...)
#define PRINT_INFO(x...) printk(KERN_INFO "[SPRD_KPLED_INFO] " x)
#define PRINT_WARN(x...) printk(KERN_INFO "[SPRD_KPLED_WARN] " x)
#define PRINT_ERR(format,x...) printk(KERN_ERR "[SPRD_KPLED_ERR] func: %s line: %04d info: " format, __func__, __LINE__, ## x)
#endif
#ifdef CONFIG_ARCH_SCX35
#define SPRD_ANA_BASE (SPRD_MISC_BASE + 0x8800)
#else
#define SPRD_ANA_BASE (SPRD_MISC_BASE + 0x600)
#endif
#define ANA_REG_BASE SPRD_ANA_BASE
#ifdef CONFIG_ARCH_SC8825
#define ANA_LED_CTRL (ANA_REG_BASE + 0X70)
#else
#ifdef CONFIG_ARCH_SCX15
#define ANA_LED_CTRL (ANA_REG_BASE + 0XE0)
#else
#ifdef CONFIG_ARCH_SCX35
#define ANA_LED_CTRL (ANA_REG_BASE + 0XA0)
#ifdef CONFIG_ARCH_SCX30G
#define CA_CTRL2 (ANA_REG_BASE + 0X158)
#define LDO_KPLED_PD (1 << 8)
#define SLP_LDOKPLED_PD_EN (1 << 9)
#endif
#else
#define ANA_LED_CTRL (ANA_REG_BASE + 0X68)
#endif
#endif
#endif
#define KPLED_CTL ANA_LED_CTRL
#ifdef CONFIG_ARCH_SCX15
#define KPLED_PD_SET (1 << 0)
#define KPLED_V_SHIFT 4
#define KPLED_V_MSK (0x0F << KPLED_V_SHIFT)
#else
#ifdef CONFIG_ARCH_SCX35
#define KPLED_PD_SET (1 << 1)
#define KPLED_V_SHIFT 4
#define KPLED_V_MSK (0x0F << KPLED_V_SHIFT)
#else
#define KPLED_PD_SET (1 << 11)
#define KPLED_PD_RST (1 << 12)
#define KPLED_V_SHIFT 7
#define KPLED_V_MSK (0x07 << KPLED_V_SHIFT)
#endif
#endif
/* sprd keypad backlight */
struct sprd_kpled {
struct platform_device *dev;
struct mutex mutex;
struct work_struct work;
spinlock_t value_lock;
enum led_brightness value;
struct led_classdev cdev;
int enabled;
#ifdef CONFIG_HAS_EARLYSUSPEND
struct early_suspend early_suspend;
#endif
};
#define to_sprd_led(led_cdev) \
container_of(led_cdev, struct sprd_kpled, cdev)
static inline unsigned long kpled_read(unsigned long reg)
{
return sci_adi_read(reg);
}
static void sprd_kpled_set_brightness( unsigned long brightness)
{
unsigned long brightness_level;
brightness_level = brightness;
if(brightness_level > 255)
brightness_level = 255;
#ifdef CONFIG_ARCH_SCX35
/*brightness steps = 16*/
brightness_level = brightness_level/16;
brightness_level = 0;//set brightness_level = 0 for reducing power consumption
#else
/*brightness steps = 8*/
brightness_level = brightness_level/32;
#endif
// Set Output Current
sci_adi_write((unsigned long)KPLED_CTL, ((brightness_level << KPLED_V_SHIFT) & KPLED_V_MSK), KPLED_V_MSK);
PRINT_INFO("reg:0x%08X set_val:0x%08X brightness:%ld brightness_level:%ld(0~15)\n", \
KPLED_CTL, kpled_read((unsigned long)KPLED_CTL), brightness, brightness_level);
}
static void sprd_kpled_enable(struct sprd_kpled *led)
{
#ifdef CONFIG_ARCH_SCX35
sci_adi_clr((unsigned long)KPLED_CTL, KPLED_PD_SET);
#ifdef CONFIG_ARCH_SCX30G
sci_adi_set((unsigned long)CA_CTRL2, LDO_KPLED_PD);
#endif
#else
sci_adi_clr((unsigned long)KPLED_CTL, KPLED_PD_SET|KPLED_PD_RST);
sci_adi_set((unsigned long)KPLED_CTL, KPLED_PD_RST);
#endif
PRINT_INFO("sprd_kpled_enable\n");
sprd_kpled_set_brightness(led->value);
led->enabled = 1;
}
static void sprd_kpled_disable(struct sprd_kpled *led)
{
#ifdef CONFIG_ARCH_SCX35
sci_adi_set((unsigned long)KPLED_CTL, KPLED_PD_SET);
#ifdef CONFIG_ARCH_SCX30G
sci_adi_clr((unsigned long)CA_CTRL2, LDO_KPLED_PD);
#endif
#else
sci_adi_clr((unsigned long)KPLED_CTL, KPLED_PD_SET|KPLED_PD_RST);
sci_adi_set((unsigned long)KPLED_CTL, KPLED_PD_SET);
#endif
PRINT_INFO("sprd_kpled_disable\n");
led->enabled = 0;
}
static void sprd_kpled_work(struct work_struct *work)
{
struct sprd_kpled *led = container_of(work, struct sprd_kpled, work);
unsigned long flags;
mutex_lock(&led->mutex);
spin_lock_irqsave(&led->value_lock, flags);
if (led->value == LED_OFF) {
spin_unlock_irqrestore(&led->value_lock, flags);
sprd_kpled_disable(led);
goto out;
}
spin_unlock_irqrestore(&led->value_lock, flags);
sprd_kpled_enable(led);
out:
mutex_unlock(&led->mutex);
}
static void sprd_kpled_set(struct led_classdev *led_cdev,
enum led_brightness value)
{
struct sprd_kpled *led = to_sprd_led(led_cdev);
unsigned long flags;
spin_lock_irqsave(&led->value_lock, flags);
led->value = value;
spin_unlock_irqrestore(&led->value_lock, flags);
schedule_work(&led->work);
}
static void sprd_kpled_shutdown(struct platform_device *dev)
{
struct sprd_kpled *led = platform_get_drvdata(dev);
mutex_lock(&led->mutex);
sprd_kpled_disable(led);
mutex_unlock(&led->mutex);
}
#ifdef CONFIG_EARLYSUSPEND
static void sprd_kpled_early_suspend(struct early_suspend *es)
{
struct sprd_kpled *led = container_of(es, struct sprd_kpled, early_suspend);
PRINT_INFO("sprd_kpled_early_suspend\n");
}
static void sprd_kpled_late_resume(struct early_suspend *es)
{
struct sprd_kpled *led = container_of(es, struct sprd_kpled, early_suspend);
PRINT_INFO("sprd_kpled_late_resume\n");
}
#endif
static int sprd_kpled_probe(struct platform_device *dev)
{
struct sprd_kpled *led;
int ret;
led = kzalloc(sizeof(struct sprd_kpled), GFP_KERNEL);
if (led == NULL) {
dev_err(&dev->dev, "No memory for device\n");
return -ENOMEM;
}
led->cdev.brightness_set = sprd_kpled_set;
//led->cdev.default_trigger = "heartbeat";
led->cdev.default_trigger = "none";
led->cdev.name = "keyboard-backlight";
led->cdev.brightness_get = NULL;
led->cdev.flags |= LED_CORE_SUSPENDRESUME;
led->enabled = 0;
spin_lock_init(&led->value_lock);
mutex_init(&led->mutex);
INIT_WORK(&led->work, sprd_kpled_work);
led->value = LED_OFF;
platform_set_drvdata(dev, led);
/* register our new led device */
ret = led_classdev_register(&dev->dev, &led->cdev);
if (ret < 0) {
dev_err(&dev->dev, "led_classdev_register failed\n");
kfree(led);
return ret;
}
#ifdef CONFIG_HAS_EARLYSUSPEND
led->early_suspend.suspend = sprd_kpled_early_suspend;
led->early_suspend.resume = sprd_kpled_late_resume;
led->early_suspend.level = EARLY_SUSPEND_LEVEL_BLANK_SCREEN;
register_early_suspend(&led->early_suspend);
#endif
sprd_kpled_disable(led);//disabled by default
#ifdef CONFIG_ARCH_SCX30G
sci_adi_clr((unsigned long)CA_CTRL2, SLP_LDOKPLED_PD_EN);
#endif
return 0;
}
static int sprd_kpled_remove(struct platform_device *dev)
{
struct sprd_kpled *led = platform_get_drvdata(dev);
led_classdev_unregister(&led->cdev);
flush_scheduled_work();
led->value = LED_OFF;
led->enabled = 1;
sprd_kpled_disable(led);
kfree(led);
return 0;
}
static const struct of_device_id keyboard_backlight_of_match[] = {
{ .compatible = "sprd,keyboard-backlight", },
{ }
};
static struct platform_driver sprd_kpled_driver = {
.driver = {
.name = "keyboard-backlight",
.owner = THIS_MODULE,
.of_match_table = keyboard_backlight_of_match,
},
.probe = sprd_kpled_probe,
.remove = sprd_kpled_remove,
.shutdown = sprd_kpled_shutdown,
};
static int __init sprd_kpled_init(void)
{
return platform_driver_register(&sprd_kpled_driver);
}
static void sprd_kpled_exit(void)
{
platform_driver_unregister(&sprd_kpled_driver);
}
module_init(sprd_kpled_init);
module_exit(sprd_kpled_exit);
MODULE_AUTHOR("Ye Wu <ye.wu@spreadtrum.com>");
MODULE_DESCRIPTION("Sprd Keyboard backlight driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:keyboard-backlight");
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