kernel_samsung_a34x-permissive/drivers/misc/mediatek/flashlight/flashlights-rt5081.c
2024-04-28 15:51:13 +02:00

823 lines
20 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2019 MediaTek Inc.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
#include <linux/types.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/hrtimer.h>
#include <linux/ktime.h>
#include <linux/workqueue.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/list.h>
#include <linux/delay.h>
#include "richtek/rt-flashlight.h"
#include "mtk_charger.h"
#include "flashlight-core.h"
#include "flashlight-dt.h"
/* device tree should be defined in flashlight-dt.h */
#ifndef RT5081_DTNAME
#define RT5081_DTNAME "mediatek,flashlights_rt5081"
#endif
#define RT5081_NAME "flashlights-rt5081"
/* define channel, level */
#define RT5081_CHANNEL_NUM 2
#define RT5081_CHANNEL_CH1 0
#define RT5081_CHANNEL_CH2 1
#define RT5081_NONE (-1)
#define RT5081_DISABLE 0
#define RT5081_ENABLE 1
#define RT5081_ENABLE_TORCH 1
#define RT5081_ENABLE_FLASH 2
#define RT5081_LEVEL_NUM 32
#define RT5081_LEVEL_TORCH 16
#define RT5081_LEVEL_FLASH RT5081_LEVEL_NUM
#define RT5081_WDT_TIMEOUT 1248 /* ms */
#define RT5081_HW_TIMEOUT 400 /* ms */
/* define mutex, work queue and timer */
static DEFINE_MUTEX(rt5081_mutex);
static struct work_struct rt5081_work_ch1;
static struct work_struct rt5081_work_ch2;
static struct hrtimer rt5081_timer_ch1;
static struct hrtimer rt5081_timer_ch2;
static unsigned int rt5081_timeout_ms[RT5081_CHANNEL_NUM];
/* define usage count */
static int use_count;
/* define RTK flashlight device */
static struct flashlight_device *flashlight_dev_ch1;
static struct flashlight_device *flashlight_dev_ch2;
#define RT_FLED_DEVICE_CH1 "rt-flash-led1"
#define RT_FLED_DEVICE_CH2 "rt-flash-led2"
/* define charger consumer */
static struct charger_consumer *flashlight_charger_consumer;
#define CHARGER_SUPPLY_NAME "charger_port1"
/* is decrease voltage */
static int is_decrease_voltage;
/* platform data */
struct rt5081_platform_data {
int channel_num;
struct flashlight_device_id *dev_id;
};
/******************************************************************************
* rt5081 operations
*****************************************************************************/
static const int rt5081_current[RT5081_LEVEL_NUM] = {
25, 50, 75, 100, 125, 150, 175, 200, 225, 250,
275, 300, 325, 350, 375, 400, 450, 500, 550, 600,
650, 700, 750, 800, 850, 900, 950, 1000, 1050, 1100,
1150, 1200
};
static const unsigned char rt5081_torch_level[RT5081_LEVEL_TORCH] = {
0x00, 0x02, 0x04, 0x06, 0x08, 0x0A, 0x0C, 0x0E, 0x10, 0x12,
0x14, 0x16, 0x18, 0x1A, 0x1C, 0x1E
};
static const unsigned char rt5081_strobe_level[RT5081_LEVEL_FLASH] = {
0x80, 0x00, 0x02, 0x04, 0x06, 0x08, 0x0A, 0x0C, 0x0E, 0x10,
0x12, 0x14, 0x16, 0x18, 0x1A, 0x1C, 0x20, 0x24, 0x28, 0x2C,
0x30, 0x34, 0x38, 0x3C, 0x40, 0x44, 0x48, 0x4C, 0x50, 0x54,
0x58, 0x5C
};
static int rt5081_decouple_mode;
static int rt5081_en_ch1;
static int rt5081_en_ch2;
static int rt5081_level_ch1;
static int rt5081_level_ch2;
static int rt5081_is_charger_ready(void)
{
if (flashlight_is_ready(flashlight_dev_ch1) &&
flashlight_is_ready(flashlight_dev_ch2))
return FLASHLIGHT_CHARGER_READY;
else
return FLASHLIGHT_CHARGER_NOT_READY;
}
static int rt5081_is_torch(int level)
{
if (level >= RT5081_LEVEL_TORCH)
return -1;
return 0;
}
static int rt5081_verify_level(int level)
{
if (level < 0)
level = 0;
else if (level >= RT5081_LEVEL_NUM)
level = RT5081_LEVEL_NUM - 1;
return level;
}
/* flashlight enable function */
static int rt5081_enable(void)
{
int ret = 0;
enum flashlight_mode mode = FLASHLIGHT_MODE_TORCH;
if (!flashlight_dev_ch1 || !flashlight_dev_ch2) {
pr_info("Failed to enable since no flashlight device.\n");
return -1;
}
/* set flash mode if any channel is flash mode */
if ((rt5081_en_ch1 == RT5081_ENABLE_FLASH)
|| (rt5081_en_ch2 == RT5081_ENABLE_FLASH))
mode = FLASHLIGHT_MODE_FLASH;
/* enable channel 1 and channel 2 */
if (rt5081_en_ch1)
ret |= flashlight_set_mode(
flashlight_dev_ch1, mode);
else
ret |= flashlight_set_mode(
flashlight_dev_ch1, FLASHLIGHT_MODE_OFF);
if (rt5081_en_ch2)
ret |= flashlight_set_mode(
flashlight_dev_ch2, mode);
else
ret |= flashlight_set_mode(
flashlight_dev_ch2, FLASHLIGHT_MODE_OFF);
if (ret < 0)
pr_info("Failed to enable.\n");
return ret;
}
/* flashlight disable function */
static int rt5081_disable(void)
{
int ret = 0;
if (!flashlight_dev_ch1 || !flashlight_dev_ch2) {
pr_info("Failed to disable since no flashlight device.\n");
return -1;
}
/* disable channel 1 and channel 2 */
ret |= flashlight_set_mode(flashlight_dev_ch1, FLASHLIGHT_MODE_OFF);
ret |= flashlight_set_mode(flashlight_dev_ch2, FLASHLIGHT_MODE_OFF);
if (ret < 0)
pr_info("Failed to disable.\n");
return ret;
}
/* set flashlight level */
static int rt5081_set_level_ch1(int level)
{
level = rt5081_verify_level(level);
rt5081_level_ch1 = level;
if (!flashlight_dev_ch1) {
pr_info("Failed to set ht level since no flashlight device.\n");
return -1;
}
/* set brightness level */
if (!rt5081_is_torch(level))
flashlight_set_torch_brightness(
flashlight_dev_ch1, rt5081_torch_level[level]);
flashlight_set_strobe_brightness(
flashlight_dev_ch1, rt5081_strobe_level[level]);
return 0;
}
static int rt5081_set_level_ch2(int level)
{
level = rt5081_verify_level(level);
rt5081_level_ch2 = level;
if (!flashlight_dev_ch2) {
pr_info("Failed to set lt level since no flashlight device.\n");
return -1;
}
/* set brightness level */
if (!rt5081_is_torch(level))
flashlight_set_torch_brightness(
flashlight_dev_ch2, rt5081_torch_level[level]);
flashlight_set_strobe_brightness(
flashlight_dev_ch2, rt5081_strobe_level[level]);
return 0;
}
static int rt5081_set_level(int channel, int level)
{
if (channel == RT5081_CHANNEL_CH1)
rt5081_set_level_ch1(level);
else if (channel == RT5081_CHANNEL_CH2)
rt5081_set_level_ch2(level);
else {
pr_info("Error channel\n");
return -1;
}
return 0;
}
static int rt5081_set_scenario(int scenario)
{
/* set decouple mode */
rt5081_decouple_mode = scenario & FLASHLIGHT_SCENARIO_DECOUPLE_MASK;
/* notify charger to increase or decrease voltage */
if (!flashlight_charger_consumer) {
pr_info("Failed with no charger consumer handler.\n");
return -1;
}
mutex_lock(&rt5081_mutex);
if (scenario & FLASHLIGHT_SCENARIO_CAMERA_MASK) {
if (!is_decrease_voltage) {
pr_info("Decrease voltage level.\n");
charger_manager_enable_high_voltage_charging(
flashlight_charger_consumer, false);
is_decrease_voltage = 1;
}
} else {
if (is_decrease_voltage) {
pr_info("Increase voltage level.\n");
charger_manager_enable_high_voltage_charging(
flashlight_charger_consumer, true);
is_decrease_voltage = 0;
}
}
mutex_unlock(&rt5081_mutex);
return 0;
}
/* flashlight init */
static int rt5081_init(void)
{
/* clear flashlight state */
rt5081_en_ch1 = RT5081_NONE;
rt5081_en_ch2 = RT5081_NONE;
/* clear decouple mode */
rt5081_decouple_mode = FLASHLIGHT_SCENARIO_COUPLE;
/* clear charger status */
is_decrease_voltage = 0;
return 0;
}
/* flashlight uninit */
static int rt5081_uninit(void)
{
/* clear flashlight state */
rt5081_en_ch1 = RT5081_NONE;
rt5081_en_ch2 = RT5081_NONE;
/* clear decouple mode */
rt5081_decouple_mode = FLASHLIGHT_SCENARIO_COUPLE;
/* clear charger status */
is_decrease_voltage = 0;
return rt5081_disable();
}
/******************************************************************************
* Timer and work queue
*****************************************************************************/
static void rt5081_work_disable_ch1(struct work_struct *data)
{
pr_debug("ht work queue callback\n");
rt5081_disable();
}
static void rt5081_work_disable_ch2(struct work_struct *data)
{
pr_debug("lt work queue callback\n");
rt5081_disable();
}
static enum hrtimer_restart rt5081_timer_func_ch1(struct hrtimer *timer)
{
schedule_work(&rt5081_work_ch1);
return HRTIMER_NORESTART;
}
static enum hrtimer_restart rt5081_timer_func_ch2(struct hrtimer *timer)
{
schedule_work(&rt5081_work_ch2);
return HRTIMER_NORESTART;
}
static int rt5081_timer_start(int channel, ktime_t ktime)
{
if (channel == RT5081_CHANNEL_CH1)
hrtimer_start(&rt5081_timer_ch1, ktime, HRTIMER_MODE_REL);
else if (channel == RT5081_CHANNEL_CH2)
hrtimer_start(&rt5081_timer_ch2, ktime, HRTIMER_MODE_REL);
else {
pr_info("Error channel\n");
return -1;
}
return 0;
}
static int rt5081_timer_cancel(int channel)
{
if (channel == RT5081_CHANNEL_CH1)
hrtimer_cancel(&rt5081_timer_ch1);
else if (channel == RT5081_CHANNEL_CH2)
hrtimer_cancel(&rt5081_timer_ch2);
else {
pr_info("Error channel\n");
return -1;
}
return 0;
}
/******************************************************************************
* Flashlight operation wrapper function
*****************************************************************************/
static int rt5081_operate(int channel, int enable)
{
ktime_t ktime;
unsigned int s;
unsigned int ns;
/* setup enable/disable */
if (channel == RT5081_CHANNEL_CH1) {
rt5081_en_ch1 = enable;
if (rt5081_en_ch1)
if (rt5081_is_torch(rt5081_level_ch1))
rt5081_en_ch1 = RT5081_ENABLE_FLASH;
} else if (channel == RT5081_CHANNEL_CH2) {
rt5081_en_ch2 = enable;
if (rt5081_en_ch2)
if (rt5081_is_torch(rt5081_level_ch2))
rt5081_en_ch2 = RT5081_ENABLE_FLASH;
} else {
pr_info("Error channel\n");
return -1;
}
/* decouple mode */
if (rt5081_decouple_mode) {
if (channel == RT5081_CHANNEL_CH1) {
rt5081_en_ch2 = RT5081_DISABLE;
rt5081_timeout_ms[RT5081_CHANNEL_CH2] = 0;
} else if (channel == RT5081_CHANNEL_CH2) {
rt5081_en_ch1 = RT5081_DISABLE;
rt5081_timeout_ms[RT5081_CHANNEL_CH1] = 0;
}
}
/* operate flashlight and setup timer */
if ((rt5081_en_ch1 != RT5081_NONE) && (rt5081_en_ch2 != RT5081_NONE)) {
if ((rt5081_en_ch1 == RT5081_DISABLE) &&
(rt5081_en_ch2 == RT5081_DISABLE)) {
rt5081_disable();
rt5081_timer_cancel(RT5081_CHANNEL_CH1);
rt5081_timer_cancel(RT5081_CHANNEL_CH2);
} else {
if (rt5081_timeout_ms[RT5081_CHANNEL_CH1]) {
s = rt5081_timeout_ms[RT5081_CHANNEL_CH1]
/ 1000;
ns = rt5081_timeout_ms[RT5081_CHANNEL_CH1]
% 1000 * 1000000;
ktime = ktime_set(s, ns);
rt5081_timer_start(RT5081_CHANNEL_CH1, ktime);
}
if (rt5081_timeout_ms[RT5081_CHANNEL_CH2]) {
s = rt5081_timeout_ms[RT5081_CHANNEL_CH2]
/ 1000;
ns = rt5081_timeout_ms[RT5081_CHANNEL_CH2]
% 1000 * 1000000;
ktime = ktime_set(s, ns);
rt5081_timer_start(RT5081_CHANNEL_CH2, ktime);
}
rt5081_enable();
}
/* clear flashlight state */
rt5081_en_ch1 = RT5081_NONE;
rt5081_en_ch2 = RT5081_NONE;
}
return 0;
}
/******************************************************************************
* Flashlight operations
*****************************************************************************/
static int rt5081_ioctl(unsigned int cmd, unsigned long arg)
{
struct flashlight_dev_arg *fl_arg;
int channel;
fl_arg = (struct flashlight_dev_arg *)arg;
channel = fl_arg->channel;
/* verify channel */
if (channel < 0 || channel >= RT5081_CHANNEL_NUM) {
pr_info("Failed with error channel\n");
return -EINVAL;
}
switch (cmd) {
case FLASH_IOC_SET_TIME_OUT_TIME_MS:
pr_debug("FLASH_IOC_SET_TIME_OUT_TIME_MS(%d): %d\n",
channel, (int)fl_arg->arg);
rt5081_timeout_ms[channel] = fl_arg->arg;
break;
case FLASH_IOC_SET_DUTY:
pr_debug("FLASH_IOC_SET_DUTY(%d): %d\n",
channel, (int)fl_arg->arg);
rt5081_set_level(channel, fl_arg->arg);
break;
case FLASH_IOC_SET_SCENARIO:
pr_debug("FLASH_IOC_SET_SCENARIO(%d): %d\n",
channel, (int)fl_arg->arg);
rt5081_set_scenario(fl_arg->arg);
break;
case FLASH_IOC_SET_ONOFF:
pr_debug("FLASH_IOC_SET_ONOFF(%d): %d\n",
channel, (int)fl_arg->arg);
rt5081_operate(channel, fl_arg->arg);
break;
case FLASH_IOC_IS_CHARGER_READY:
pr_debug("FLASH_IOC_IS_CHARGER_READY(%d)\n", channel);
fl_arg->arg = rt5081_is_charger_ready();
break;
case FLASH_IOC_GET_DUTY_NUMBER:
pr_debug("FLASH_IOC_GET_DUTY_NUMBER(%d)\n", channel);
fl_arg->arg = RT5081_LEVEL_NUM;
break;
case FLASH_IOC_GET_MAX_TORCH_DUTY:
pr_debug("FLASH_IOC_GET_MAX_TORCH_DUTY(%d)\n", channel);
fl_arg->arg = RT5081_LEVEL_TORCH - 1;
break;
case FLASH_IOC_GET_DUTY_CURRENT:
fl_arg->arg = rt5081_verify_level(fl_arg->arg);
pr_debug("FLASH_IOC_GET_DUTY_CURRENT(%d): %d\n",
channel, (int)fl_arg->arg);
fl_arg->arg = rt5081_current[fl_arg->arg];
break;
case FLASH_IOC_GET_HW_TIMEOUT:
pr_debug("FLASH_IOC_GET_HW_TIMEOUT(%d)\n", channel);
fl_arg->arg = RT5081_HW_TIMEOUT;
break;
default:
pr_info("No such command and arg(%d): (%d, %d)\n",
channel, _IOC_NR(cmd), (int)fl_arg->arg);
return -ENOTTY;
}
return 0;
}
static int rt5081_open(void)
{
/* Move to set driver for saving power */
return 0;
}
static int rt5081_release(void)
{
/* Move to set driver for saving power */
return 0;
}
static int rt5081_set_driver(int set)
{
int ret = 0;
/* set chip and usage count */
mutex_lock(&rt5081_mutex);
if (set) {
if (!use_count)
ret = rt5081_init();
use_count++;
pr_debug("Set driver: %d\n", use_count);
} else {
use_count--;
if (!use_count)
ret = rt5081_uninit();
if (use_count < 0)
use_count = 0;
pr_debug("Unset driver: %d\n", use_count);
}
mutex_unlock(&rt5081_mutex);
return ret;
}
static ssize_t rt5081_strobe_store(struct flashlight_arg arg)
{
rt5081_set_driver(1);
rt5081_set_scenario(
FLASHLIGHT_SCENARIO_CAMERA |
FLASHLIGHT_SCENARIO_COUPLE);
rt5081_set_level(arg.channel, arg.level);
rt5081_timeout_ms[arg.channel] = 0;
if (arg.level < 0)
rt5081_operate(arg.channel, RT5081_DISABLE);
else
rt5081_operate(arg.channel, RT5081_ENABLE);
msleep(arg.dur);
rt5081_set_scenario(
FLASHLIGHT_SCENARIO_FLASHLIGHT |
FLASHLIGHT_SCENARIO_COUPLE);
rt5081_operate(arg.channel, RT5081_DISABLE);
rt5081_set_driver(0);
return 0;
}
static struct flashlight_operations rt5081_ops = {
rt5081_open,
rt5081_release,
rt5081_ioctl,
rt5081_strobe_store,
rt5081_set_driver
};
/******************************************************************************
* Platform device and driver
*****************************************************************************/
static int rt5081_parse_dt(struct device *dev,
struct rt5081_platform_data *pdata)
{
struct device_node *np, *cnp;
u32 decouple = 0;
int i = 0;
if (!dev || !dev->of_node || !pdata)
return -ENODEV;
np = dev->of_node;
pdata->channel_num = of_get_child_count(np);
if (!pdata->channel_num) {
pr_info("Parse no dt, node.\n");
return 0;
}
pr_info("Channel number(%d).\n", pdata->channel_num);
if (of_property_read_u32(np, "decouple", &decouple))
pr_info("Parse no dt, decouple.\n");
pdata->dev_id = devm_kzalloc(dev,
pdata->channel_num *
sizeof(struct flashlight_device_id),
GFP_KERNEL);
if (!pdata->dev_id)
return -ENOMEM;
for_each_child_of_node(np, cnp) {
if (of_property_read_u32(cnp, "type", &pdata->dev_id[i].type))
goto err_node_put;
if (of_property_read_u32(cnp, "ct", &pdata->dev_id[i].ct))
goto err_node_put;
if (of_property_read_u32(cnp, "part", &pdata->dev_id[i].part))
goto err_node_put;
snprintf(pdata->dev_id[i].name, FLASHLIGHT_NAME_SIZE,
RT5081_NAME);
pdata->dev_id[i].channel = i;
pdata->dev_id[i].decouple = decouple;
pr_info("Parse dt (type,ct,part,name,channel,decouple)=(%d,%d,%d,%s,%d,%d).\n",
pdata->dev_id[i].type, pdata->dev_id[i].ct,
pdata->dev_id[i].part, pdata->dev_id[i].name,
pdata->dev_id[i].channel,
pdata->dev_id[i].decouple);
i++;
}
return 0;
err_node_put:
of_node_put(cnp);
return -EINVAL;
}
static int rt5081_probe(struct platform_device *pdev)
{
struct rt5081_platform_data *pdata = dev_get_platdata(&pdev->dev);
int ret;
int i;
pr_debug("Probe start.\n");
/* parse dt */
if (!pdata) {
pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return -ENOMEM;
pdev->dev.platform_data = pdata;
ret = rt5081_parse_dt(&pdev->dev, pdata);
if (ret)
return ret;
}
/* init work queue */
INIT_WORK(&rt5081_work_ch1, rt5081_work_disable_ch1);
INIT_WORK(&rt5081_work_ch2, rt5081_work_disable_ch2);
/* init timer */
hrtimer_init(&rt5081_timer_ch1, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
rt5081_timer_ch1.function = rt5081_timer_func_ch1;
hrtimer_init(&rt5081_timer_ch2, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
rt5081_timer_ch2.function = rt5081_timer_func_ch2;
rt5081_timeout_ms[RT5081_CHANNEL_CH1] = 600;
rt5081_timeout_ms[RT5081_CHANNEL_CH2] = 600;
/* clear attributes */
use_count = 0;
is_decrease_voltage = 0;
/* get RTK flashlight handler */
flashlight_dev_ch1 = find_flashlight_by_name(RT_FLED_DEVICE_CH1);
if (!flashlight_dev_ch1) {
pr_info("Failed to get ht flashlight device.\n");
return -EFAULT;
}
flashlight_dev_ch2 = find_flashlight_by_name(RT_FLED_DEVICE_CH2);
if (!flashlight_dev_ch2) {
pr_info("Failed to get lt flashlight device.\n");
return -EFAULT;
}
/* setup strobe mode timeout */
if (flashlight_set_strobe_timeout(flashlight_dev_ch1,
RT5081_HW_TIMEOUT, RT5081_HW_TIMEOUT + 200) < 0)
pr_info("Failed to set strobe timeout.\n");
/* get charger consumer manager */
flashlight_charger_consumer = charger_manager_get_by_name(
&flashlight_dev_ch1->dev, CHARGER_SUPPLY_NAME);
if (!flashlight_charger_consumer) {
pr_info("Failed to get charger manager.\n");
return -EFAULT;
}
/* register flashlight device */
if (pdata->channel_num) {
for (i = 0; i < pdata->channel_num; i++)
if (flashlight_dev_register_by_device_id(
&pdata->dev_id[i], &rt5081_ops))
return -EFAULT;
} else {
if (flashlight_dev_register(RT5081_NAME, &rt5081_ops))
return -EFAULT;
}
pr_debug("Probe done.\n");
return 0;
}
static int rt5081_remove(struct platform_device *pdev)
{
struct rt5081_platform_data *pdata = dev_get_platdata(&pdev->dev);
int i;
pr_debug("Remove start.\n");
pdev->dev.platform_data = NULL;
/* unregister flashlight device */
if (pdata && pdata->channel_num)
for (i = 0; i < pdata->channel_num; i++)
flashlight_dev_unregister_by_device_id(
&pdata->dev_id[i]);
else
flashlight_dev_unregister(RT5081_NAME);
/* flush work queue */
flush_work(&rt5081_work_ch1);
flush_work(&rt5081_work_ch2);
/* clear RTK flashlight device */
flashlight_dev_ch1 = NULL;
flashlight_dev_ch2 = NULL;
pr_debug("Remove done.\n");
return 0;
}
#ifdef CONFIG_OF
static const struct of_device_id rt5081_of_match[] = {
{.compatible = RT5081_DTNAME},
{},
};
MODULE_DEVICE_TABLE(of, rt5081_of_match);
#else
static struct platform_device rt5081_platform_device[] = {
{
.name = RT5081_NAME,
.id = 0,
.dev = {}
},
{}
};
MODULE_DEVICE_TABLE(platform, rt5081_platform_device);
#endif
static struct platform_driver rt5081_platform_driver = {
.probe = rt5081_probe,
.remove = rt5081_remove,
.driver = {
.name = RT5081_NAME,
.owner = THIS_MODULE,
#ifdef CONFIG_OF
.of_match_table = rt5081_of_match,
#endif
},
};
static int __init flashlight_rt5081_init(void)
{
int ret;
pr_debug("Init start.\n");
#ifndef CONFIG_OF
ret = platform_device_register(&rt5081_platform_device);
if (ret) {
pr_info("Failed to register platform device\n");
return ret;
}
#endif
ret = platform_driver_register(&rt5081_platform_driver);
if (ret) {
pr_info("Failed to register platform driver\n");
return ret;
}
pr_debug("Init done.\n");
return 0;
}
static void __exit flashlight_rt5081_exit(void)
{
pr_debug("Exit start.\n");
platform_driver_unregister(&rt5081_platform_driver);
pr_debug("Exit done.\n");
}
/* replace module_init() since conflict in kernel init process */
late_initcall(flashlight_rt5081_init);
module_exit(flashlight_rt5081_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Simon Wang <Simon-TCH.Wang@mediatek.com>");
MODULE_DESCRIPTION("MTK Flashlight RT5081 Driver");