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/*
* leds-da9052.c -- LED Driver for Dialog DA9052
*
* Copyright(c) 2009 Dialog Semiconductor Ltd.
*
* Author: Dialog Semiconductor Ltd <dchen@diasemi.com>
*
* 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/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/mfd/da9052/reg.h>
#include <linux/mfd/da9052/da9052.h>
#include <linux/mfd/da9052/led.h>
#define DRIVER_NAME "da9052-leds"
#define DA9052_LED4_PRESENT 1
#define DA9052_LED5_PRESENT 1
struct da9052_led_data {
struct led_classdev cdev;
struct work_struct work;
struct da9052 *da9052;
int id;
int new_brightness;
int is_led4_present;
int is_led5_present;
};
#define GPIO14_PIN 2 /* GPO Open Drain */
#define GPIO14_TYPE 0 /* VDD_IO1 */
#define GPIO14_MODE 1 /* Output High */
#define GPIO15_PIN 2 /* GPO Open Drain */
#define GPIO15_TYPE 0 /* VDD_IO1 */
#define GPIO15_MODE 1 /* Output High */
#define MAXIMUM_PWM 95
#define MASK_GPIO14 0x0F
#define MASK_GPIO15 0xF0
#define GPIO15_PIN_BIT_POSITION 4
static void da9052_led_work(struct work_struct *work)
{
struct da9052_led_data *led = container_of(work,
struct da9052_led_data, work);
int reg = 0;
int led_dim_bit = 0;
struct da9052_ssc_msg msg;
int ret = 0;
switch (led->id) {
case DA9052_LED_4:
reg = DA9052_LED4CONT_REG;
led_dim_bit = DA9052_LED4CONT_LED4DIM;
break;
case DA9052_LED_5:
reg = DA9052_LED5CONT_REG;
led_dim_bit = DA9052_LED5CONT_LED5DIM;
break;
}
if (led->new_brightness > MAXIMUM_PWM)
led->new_brightness = MAXIMUM_PWM;
/* Always enable DIM feature
* This feature can be disabled if required
*/
msg.addr = reg;
msg.data = led->new_brightness | led_dim_bit;
da9052_lock(led->da9052);
ret = led->da9052->write(led->da9052, &msg);
if (ret) {
da9052_unlock(led->da9052);
return;
}
da9052_unlock(led->da9052);
}
static void da9052_led_set(struct led_classdev *led_cdev,
enum led_brightness value)
{
struct da9052_led_data *led;
led = container_of(led_cdev, struct da9052_led_data, cdev);
led->new_brightness = value;
schedule_work(&led->work);
}
static int __devinit da9052_led_setup(struct da9052_led_data *led)
{
int reg = 0;
int ret = 0;
struct da9052_ssc_msg msg;
switch (led->id) {
case DA9052_LED_4:
reg = DA9052_LED4CONT_REG;
break;
case DA9052_LED_5:
reg = DA9052_LED5CONT_REG;
break;
}
msg.addr = reg;
msg.data = 0;
da9052_lock(led->da9052);
ret = led->da9052->write(led->da9052, &msg);
if (ret) {
da9052_unlock(led->da9052);
return ret;
}
da9052_unlock(led->da9052);
return ret;
}
static int da9052_leds_prepare(struct da9052_led_data *led)
{
int ret = 0;
struct da9052_ssc_msg msg;
da9052_lock(led->da9052);
if (1 == led->is_led4_present) {
msg.addr = DA9052_GPIO1415_REG;
msg.data = 0;
ret = led->da9052->read(led->da9052, &msg);
if (ret)
goto out;
msg.data = msg.data & ~(MASK_GPIO14);
msg.data = msg.data | (
GPIO14_PIN |
(GPIO14_TYPE ? DA9052_GPIO1415_GPIO14TYPE : 0) |
(GPIO14_MODE ? DA9052_GPIO1415_GPIO14MODE : 0));
ret = led->da9052->write(led->da9052, &msg);
if (ret)
goto out;
}
if (1 == led->is_led5_present) {
msg.addr = DA9052_GPIO1415_REG;
msg.data = 0;
ret = led->da9052->read(led->da9052, &msg);
if (ret)
goto out;
msg.data = msg.data & ~(MASK_GPIO15);
msg.data = msg.data |
(((GPIO15_PIN << GPIO15_PIN_BIT_POSITION) |
(GPIO15_TYPE ? DA9052_GPIO1415_GPIO15TYPE : 0) |
(GPIO15_MODE ? DA9052_GPIO1415_GPIO15MODE : 0))
);
ret = led->da9052->write(led->da9052, &msg);
if (ret)
goto out;
}
da9052_unlock(led->da9052);
return ret;
out:
da9052_unlock(led->da9052);
return ret;
}
static int __devinit da9052_led_probe(struct platform_device *pdev)
{
struct da9052_leds_platform_data *pdata = (pdev->dev.platform_data);
struct da9052_led_platform_data *led_cur;
struct da9052_led_data *led, *led_dat;
int ret, i;
int init_led = 0;
if (pdata->num_leds < 1 || pdata->num_leds > DA9052_LED_MAX) {
dev_err(&pdev->dev, "Invalid led count %d\n", pdata->num_leds);
return -EINVAL;
}
led = kzalloc(sizeof(*led) * pdata->num_leds, GFP_KERNEL);
if (led == NULL) {
dev_err(&pdev->dev, "failed to alloc memory\n");
return -ENOMEM;
}
led->is_led4_present = DA9052_LED4_PRESENT;
led->is_led5_present = DA9052_LED5_PRESENT;
for (i = 0; i < pdata->num_leds; i++) {
led_dat = &led[i];
led_cur = &pdata->led[i];
if (led_cur->id < 0) {
dev_err(&pdev->dev, "invalid id %d\n", led_cur->id);
ret = -EINVAL;
goto err_register;
}
if (init_led & (1 << led_cur->id)) {
dev_err(&pdev->dev, "led %d already initialized\n",
led_cur->id);
ret = -EINVAL;
goto err_register;
}
init_led |= 1 << led_cur->id;
led_dat->cdev.name = led_cur->name;
// led_dat->cdev.default_trigger = led_cur[i]->default_trigger;
led_dat->cdev.brightness_set = da9052_led_set;
led_dat->cdev.brightness = LED_OFF;
led_dat->id = led_cur->id;
led_dat->da9052 = dev_get_drvdata(pdev->dev.parent);
INIT_WORK(&led_dat->work, da9052_led_work);
ret = led_classdev_register(pdev->dev.parent, &led_dat->cdev);
if (ret) {
dev_err(&pdev->dev, "failed to register led %d\n",
led_dat->id);
goto err_register;
}
ret = da9052_led_setup(led_dat);
if (ret) {
dev_err(&pdev->dev, "unable to init led %d\n",
led_dat->id);
i++;
goto err_register;
}
}
ret = da9052_leds_prepare(led);
if (ret) {
dev_err(&pdev->dev, "unable to init led driver\n");
goto err_free;
}
platform_set_drvdata(pdev, led);
return 0;
err_register:
for (i = i - 1; i >= 0; i--) {
led_classdev_unregister(&led[i].cdev);
cancel_work_sync(&led[i].work);
}
err_free:
kfree(led);
return ret;
}
static int __devexit da9052_led_remove(struct platform_device *pdev)
{
struct da9052_leds_platform_data *pdata =
(struct da9052_leds_platform_data *)pdev->dev.platform_data;
struct da9052_led_data *led = platform_get_drvdata(pdev);
int i;
for (i = 0; i < pdata->num_leds; i++) {
da9052_led_setup(&led[i]);
led_classdev_unregister(&led[i].cdev);
cancel_work_sync(&led[i].work);
}
kfree(led);
return 0;
}
static struct platform_driver da9052_led_driver = {
.driver = {
.name = DRIVER_NAME,
.owner = THIS_MODULE,
},
.probe = da9052_led_probe,
.remove = __devexit_p(da9052_led_remove),
};
static int __init da9052_led_init(void)
{
return platform_driver_register(&da9052_led_driver);
}
module_init(da9052_led_init);
static void __exit da9052_led_exit(void)
{
platform_driver_unregister(&da9052_led_driver);
}
module_exit(da9052_led_exit);
MODULE_AUTHOR("Dialog Semiconductor Ltd <dchen@diasemi.com> ");
MODULE_DESCRIPTION("LED driver for Dialog DA9052 PMIC");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:" DRIVER_NAME);
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