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/*
* LEDs driver for MAX8831
*
* Copyright (c) 2008-2012, NVIDIA Corporation.
*
* 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.
*
* 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.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/leds.h>
#include <linux/workqueue.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/err.h>
#include <linux/leds.h>
#include <linux/ctype.h>
#include <linux/mfd/max8831.h>
#include <linux/delay.h>
struct max8831_led {
struct led_classdev cdev;
struct work_struct work;
enum led_brightness new_brightness;
struct device *master;
int id;
};
static void max8831_led_work(struct work_struct *work)
{
struct max8831_led *led = container_of(work, struct max8831_led, work);
unsigned int on_off_addr = MAX8831_CTRL;
unsigned int blink_reg = 0;
unsigned int curr_ctrl_reg = 0;
unsigned int led_enb_mask = 0;
on_off_addr = MAX8831_CTRL;
switch (led->id) {
case MAX8831_ID_LED1:
curr_ctrl_reg = MAX8831_CURRENT_CTRL_LED1;
led_enb_mask = MAX8831_CTRL_LED1_ENB;
break;
case MAX8831_ID_LED2:
curr_ctrl_reg = MAX8831_CURRENT_CTRL_LED2;
led_enb_mask = MAX8831_CTRL_LED2_ENB;
break;
case MAX8831_ID_LED3:
curr_ctrl_reg = MAX8831_CURRENT_CTRL_LED3;
led_enb_mask = MAX8831_CTRL_LED3_ENB;
blink_reg = MAX8831_BLINK_CTRL_LED3;
break;
case MAX8831_ID_LED4:
curr_ctrl_reg = MAX8831_CURRENT_CTRL_LED4;
led_enb_mask = MAX8831_CTRL_LED4_ENB;
blink_reg = MAX8831_BLINK_CTRL_LED4;
break;
case MAX8831_ID_LED5:
curr_ctrl_reg = MAX8831_CURRENT_CTRL_LED5;
led_enb_mask = MAX8831_CTRL_LED5_ENB;
blink_reg = MAX8831_BLINK_CTRL_LED5;
break;
}
/* disable blinking */
if (blink_reg)
max8831_update_bits(led->master, blink_reg,
MAX8831_BLINK_ENB, 0);
if (led->new_brightness == 0) {
max8831_update_bits(led->master, on_off_addr, led_enb_mask, 0);
} else {
max8831_update_bits(led->master, on_off_addr, led_enb_mask,
led_enb_mask);
max8831_write(led->master, curr_ctrl_reg, led->new_brightness);
}
}
static void max8831_led_set(struct led_classdev *led_cdev,
enum led_brightness value)
{
struct max8831_led *led;
led = container_of(led_cdev, struct max8831_led, cdev);
led->new_brightness = value;
/*
* Must use workqueue for the actual I/O since I2C operations
* can sleep.
*/
schedule_work(&led->work);
}
static int max8831_led_set_blink(struct led_classdev *led_cdev,
unsigned long *delay_on,
unsigned long *delay_off)
{
struct max8831_led *led;
unsigned int reg_val = 0;
unsigned int reg = 0;
led = container_of(led_cdev, struct max8831_led, cdev);
if (*delay_on == 256)
reg_val |= 0;
if (*delay_on == 512)
reg_val |= 1;
if (*delay_on == 1024)
reg_val |= 2;
if (*delay_on == 2048)
reg_val |= 3;
if (*delay_off == 1024)
reg_val |= 0 << MAX8831_BLINK_OFF_TIMER_SHIFT;
if (*delay_off == 2048)
reg_val |= 1 << MAX8831_BLINK_OFF_TIMER_SHIFT;
if (*delay_off == 4096)
reg_val |= 2 << MAX8831_BLINK_OFF_TIMER_SHIFT;
if (*delay_off == 8192)
reg_val |= 3 << MAX8831_BLINK_OFF_TIMER_SHIFT;
reg_val = reg_val | MAX8831_BLINK_ENB;
if (led->id == MAX8831_ID_LED3)
reg = 0x17;
else if (led->id == MAX8831_ID_LED4)
reg = 0x18;
else if (led->id == MAX8831_ID_LED5)
reg = 0x19;
max8831_led_set(&led->cdev, MAX8831_KEY_LEDS_MAX_CURR);
max8831_write(led->master, reg, reg_val);
return 0;
}
static int max8831_led_probe(struct platform_device *pdev)
{
struct led_info *pdata = pdev->dev.platform_data;
struct max8831_led *led;
int err;
if (!pdata)
return -ENODEV;
led = devm_kzalloc(&pdev->dev,
sizeof(struct max8831_led), GFP_KERNEL);
led->cdev.name = pdata->name;
led->cdev.brightness_set = max8831_led_set;
led->id = pdev->id;
led->new_brightness = LED_OFF;
led->master = pdev->dev.parent;
if (led->id > 1) {
led->cdev.blink_set = max8831_led_set_blink;
led->cdev.max_brightness = MAX8831_KEY_LEDS_MAX_CURR;
} else {
led->cdev.max_brightness = MAX8831_BL_LEDS_MAX_CURR;
}
err = led_classdev_register(led->master, &led->cdev);
if (err < 0)
return err;
INIT_WORK(&led->work, max8831_led_work);
platform_set_drvdata(pdev, led);
return 0;
}
static int max8831_led_remove(struct platform_device *pdev)
{
struct max8831_led *led = platform_get_drvdata(pdev);
led_classdev_unregister(&led->cdev);
cancel_work_sync(&led->work);
return 0;
}
static struct platform_driver max8831_led_driver = {
.driver = {
.name = "max8831_led_bl",
.owner = THIS_MODULE,
},
.probe = max8831_led_probe,
.remove = max8831_led_remove,
};
module_platform_driver(max8831_led_driver);
MODULE_AUTHOR("Chaitanya Bandi<bandik@nvidia.com>");
MODULE_DESCRIPTION("MAX8831 LED driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:max8831-led");
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