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kernel_samsung_a34x-permissive/drivers/misc/mediatek/flashlight/flashlights-lm3644.c

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Import A346BXXU1AWB9 kernel source Android 13
2024-04-28 06:49:01 -07:00
// 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 <linux/i2c.h>
#include <linux/slab.h>
#include <linux/pinctrl/consumer.h>
#include "flashlight-core.h"
#include "flashlight-dt.h"
/* device tree should be defined in flashlight-dt.h */
#ifndef LM3644_DTNAME
#define LM3644_DTNAME "mediatek,flashlights_lm3644"
#endif
#ifndef LM3644_DTNAME_I2C
#define LM3644_DTNAME_I2C "mediatek,flashlights_lm3644_i2c"
#endif
#define LM3644_NAME "flashlights-lm3644"
/* define registers */
#define LM3644_REG_ENABLE (0x01)
#define LM3644_MASK_ENABLE_LED1 (0x01)
#define LM3644_MASK_ENABLE_LED2 (0x02)
#define LM3644_DISABLE (0x00)
#define LM3644_ENABLE_LED1 (0x01)
#define LM3644_ENABLE_LED1_TORCH (0x09)
#define LM3644_ENABLE_LED1_FLASH (0x0D)
#define LM3644_ENABLE_LED2 (0x02)
#define LM3644_ENABLE_LED2_TORCH (0x0A)
#define LM3644_ENABLE_LED2_FLASH (0x0E)
#define LM3644_REG_TORCH_LEVEL_LED1 (0x05)
#define LM3644_REG_FLASH_LEVEL_LED1 (0x03)
#define LM3644_REG_TORCH_LEVEL_LED2 (0x06)
#define LM3644_REG_FLASH_LEVEL_LED2 (0x04)
#define LM3644_DEVICE_ID (0x0C)
#define LM3644_REG_TIMING_CONF (0x08)
#define LM3644_TORCH_RAMP_TIME (0x00)
#define LM3644_FLASH_TIMEOUT (0x0F)
#define LM3644TT_FLASH_TIMEOUT (0x09)
#define LM3644_REG_DEVICE_ID (0x0C)
/* define channel, level */
#define LM3644_CHANNEL_NUM 2
#define LM3644_CHANNEL_CH1 0
#define LM3644_CHANNEL_CH2 1
#define LM3644_LEVEL_NUM 39
#define LM3644_LEVEL_TORCH 7
#define LM3644_HW_TIMEOUT 400 /* ms */
/* define mutex and work queue */
static DEFINE_MUTEX(lm3644_mutex);
static struct work_struct lm3644_work_ch1;
static struct work_struct lm3644_work_ch2;
/* define pinctrl */
#define LM3644_PINCTRL_PIN_HWEN 0
#define LM3644_PINCTRL_PINSTATE_LOW 0
#define LM3644_PINCTRL_PINSTATE_HIGH 1
#define LM3644_PINCTRL_STATE_HWEN_HIGH "hwen_high"
#define LM3644_PINCTRL_STATE_HWEN_LOW "hwen_low"
static struct pinctrl *lm3644_pinctrl;
static struct pinctrl_state *lm3644_hwen_high;
static struct pinctrl_state *lm3644_hwen_low;
/* lm3644 revision */
static int is_lm3644tt;
/* define usage count */
static int use_count;
/* define i2c */
static struct i2c_client *lm3644_i2c_client;
/* platform data */
struct lm3644_platform_data {
int channel_num;
struct flashlight_device_id *dev_id;
};
static struct lm3644_platform_data *lm3644_pdata;
/* lm3644 chip data */
struct lm3644_chip_data {
struct i2c_client *client;
struct lm3644_platform_data *pdata;
struct mutex lock;
};
/******************************************************************************
* Pinctrl configuration
*****************************************************************************/
static int lm3644_pinctrl_init(struct platform_device *pdev)
{
int ret = 0;
/* get pinctrl */
lm3644_pinctrl = devm_pinctrl_get(&pdev->dev);
if (IS_ERR(lm3644_pinctrl)) {
pr_info("Failed to get flashlight pinctrl.\n");
ret = PTR_ERR(lm3644_pinctrl);
return ret;
}
/* Flashlight HWEN pin initialization */
lm3644_hwen_high = pinctrl_lookup_state(
lm3644_pinctrl, LM3644_PINCTRL_STATE_HWEN_HIGH);
if (IS_ERR(lm3644_hwen_high)) {
pr_info("Failed to init (%s)\n",
LM3644_PINCTRL_STATE_HWEN_HIGH);
ret = PTR_ERR(lm3644_hwen_high);
}
lm3644_hwen_low = pinctrl_lookup_state(
lm3644_pinctrl, LM3644_PINCTRL_STATE_HWEN_LOW);
if (IS_ERR(lm3644_hwen_low)) {
pr_info("Failed to init (%s)\n", LM3644_PINCTRL_STATE_HWEN_LOW);
ret = PTR_ERR(lm3644_hwen_low);
}
return ret;
}
static int lm3644_pinctrl_set(int pin, int state)
{
int ret = 0;
if (IS_ERR(lm3644_pinctrl)) {
pr_info("pinctrl is not available\n");
return -1;
}
switch (pin) {
case LM3644_PINCTRL_PIN_HWEN:
if (state == LM3644_PINCTRL_PINSTATE_LOW &&
!IS_ERR(lm3644_hwen_low))
pinctrl_select_state(lm3644_pinctrl, lm3644_hwen_low);
else if (state == LM3644_PINCTRL_PINSTATE_HIGH &&
!IS_ERR(lm3644_hwen_high))
pinctrl_select_state(lm3644_pinctrl, lm3644_hwen_high);
else
pr_info("set err, pin(%d) state(%d)\n", pin, state);
break;
default:
pr_info("set err, pin(%d) state(%d)\n", pin, state);
break;
}
pr_debug("pin(%d) state(%d)\n", pin, state);
return ret;
}
/******************************************************************************
* lm3644 operations
*****************************************************************************/
static const int lm3644_current[LM3644_LEVEL_NUM] = {
22, 46, 70, 93, 116, 140, 163, 187, 210, 234,
257, 281, 304, 327, 351, 374, 398, 421, 445, 468,
492, 515, 539, 562, 585, 609, 632, 656, 679, 703,
726, 761, 796, 832, 869, 902, 937, 972, 1008
};
static const unsigned char lm3644tt_torch_level[LM3644_LEVEL_NUM] = {
0x07, 0x10, 0x18, 0x21, 0x29, 0x31, 0x3A, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
static const unsigned char lm3644_torch_level[LM3644_LEVEL_NUM] = {
0x0F, 0x20, 0x31, 0x42, 0x52, 0x63, 0x74, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
static const unsigned char lm3644_flash_level[LM3644_LEVEL_NUM] = {
0x01, 0x03, 0x05, 0x07, 0x09, 0x0B, 0x0D, 0x0F, 0x11, 0x13,
0x15, 0x17, 0x19, 0x1B, 0x1D, 0x1F, 0x21, 0x23, 0x25, 0x27,
0x29, 0x2B, 0x2D, 0x2F, 0x31, 0x33, 0x35, 0x37, 0x39, 0x3B,
0x3D, 0x40, 0x43, 0x46, 0x49, 0x4C, 0x4F, 0x52, 0x54
};
static unsigned char lm3644_reg_enable;
static int lm3644_level_ch1 = -1;
static int lm3644_level_ch2 = -1;
static int lm3644_is_torch(int level)
{
if (level >= LM3644_LEVEL_TORCH)
return -1;
return 0;
}
static int lm3644_verify_level(int level)
{
if (level < 0)
level = 0;
else if (level >= LM3644_LEVEL_NUM)
level = LM3644_LEVEL_NUM - 1;
return level;
}
/* i2c wrapper function */
static int lm3644_write_reg(struct i2c_client *client, u8 reg, u8 val)
{
int ret;
struct lm3644_chip_data *chip = i2c_get_clientdata(client);
mutex_lock(&chip->lock);
ret = i2c_smbus_write_byte_data(client, reg, val);
mutex_unlock(&chip->lock);
if (ret < 0)
pr_info("failed writing at 0x%02x\n", reg);
return ret;
}
static int lm3644_read_reg(struct i2c_client *client, u8 reg)
{
int val = 0;
struct lm3644_chip_data *chip = i2c_get_clientdata(client);
mutex_lock(&chip->lock);
val = i2c_smbus_read_byte_data(client, reg);
mutex_unlock(&chip->lock);
return val;
}
/* flashlight enable function */
static int lm3644_enable_ch1(void)
{
unsigned char reg, val;
reg = LM3644_REG_ENABLE;
if (!lm3644_is_torch(lm3644_level_ch1)) {
/* torch mode */
lm3644_reg_enable |= LM3644_ENABLE_LED1_TORCH;
} else {
/* flash mode */
lm3644_reg_enable |= LM3644_ENABLE_LED1_FLASH;
}
val = lm3644_reg_enable;
return lm3644_write_reg(lm3644_i2c_client, reg, val);
}
static int lm3644_enable_ch2(void)
{
unsigned char reg, val;
reg = LM3644_REG_ENABLE;
if (!lm3644_is_torch(lm3644_level_ch2)) {
/* torch mode */
lm3644_reg_enable |= LM3644_ENABLE_LED2_TORCH;
} else {
/* flash mode */
lm3644_reg_enable |= LM3644_ENABLE_LED2_FLASH;
}
val = lm3644_reg_enable;
return lm3644_write_reg(lm3644_i2c_client, reg, val);
}
static int lm3644_enable(int channel)
{
if (channel == LM3644_CHANNEL_CH1)
lm3644_enable_ch1();
else if (channel == LM3644_CHANNEL_CH2)
lm3644_enable_ch2();
else {
pr_info("Error channel\n");
return -1;
}
return 0;
}
/* flashlight disable function */
static int lm3644_disable_ch1(void)
{
unsigned char reg, val;
reg = LM3644_REG_ENABLE;
if (lm3644_reg_enable & LM3644_MASK_ENABLE_LED2) {
/* if LED 2 is enable, disable LED 1 */
lm3644_reg_enable &= (~LM3644_ENABLE_LED1);
} else {
/* if LED 2 is disable, disable LED 1 and clear mode */
lm3644_reg_enable &= (~LM3644_ENABLE_LED1_FLASH);
}
val = lm3644_reg_enable;
return lm3644_write_reg(lm3644_i2c_client, reg, val);
}
static int lm3644_disable_ch2(void)
{
unsigned char reg, val;
reg = LM3644_REG_ENABLE;
if (lm3644_reg_enable & LM3644_MASK_ENABLE_LED1) {
/* if LED 1 is enable, disable LED 2 */
lm3644_reg_enable &= (~LM3644_ENABLE_LED2);
} else {
/* if LED 1 is disable, disable LED 2 and clear mode */
lm3644_reg_enable &= (~LM3644_ENABLE_LED2_FLASH);
}
val = lm3644_reg_enable;
return lm3644_write_reg(lm3644_i2c_client, reg, val);
}
static int lm3644_disable(int channel)
{
if (channel == LM3644_CHANNEL_CH1)
lm3644_disable_ch1();
else if (channel == LM3644_CHANNEL_CH2)
lm3644_disable_ch2();
else {
pr_info("Error channel\n");
return -1;
}
return 0;
}
/* set flashlight level */
static int lm3644_set_level_ch1(int level)
{
int ret;
unsigned char reg, val;
level = lm3644_verify_level(level);
/* set torch brightness level */
reg = LM3644_REG_TORCH_LEVEL_LED1;
if (is_lm3644tt)
val = lm3644tt_torch_level[level];
else
val = lm3644_torch_level[level];
ret = lm3644_write_reg(lm3644_i2c_client, reg, val);
lm3644_level_ch1 = level;
/* set flash brightness level */
reg = LM3644_REG_FLASH_LEVEL_LED1;
val = lm3644_flash_level[level];
ret = lm3644_write_reg(lm3644_i2c_client, reg, val);
return ret;
}
static int lm3644_set_level_ch2(int level)
{
int ret;
unsigned char reg, val;
level = lm3644_verify_level(level);
/* set torch brightness level */
reg = LM3644_REG_TORCH_LEVEL_LED2;
if (is_lm3644tt)
val = lm3644tt_torch_level[level];
else
val = lm3644_torch_level[level];
ret = lm3644_write_reg(lm3644_i2c_client, reg, val);
lm3644_level_ch2 = level;
/* set flash brightness level */
reg = LM3644_REG_FLASH_LEVEL_LED2;
val = lm3644_flash_level[level];
ret = lm3644_write_reg(lm3644_i2c_client, reg, val);
return ret;
}
static int lm3644_set_level(int channel, int level)
{
if (channel == LM3644_CHANNEL_CH1)
lm3644_set_level_ch1(level);
else if (channel == LM3644_CHANNEL_CH2)
lm3644_set_level_ch2(level);
else {
pr_info("Error channel\n");
return -1;
}
return 0;
}
/* flashlight init */
int lm3644_init(void)
{
int ret;
unsigned char reg, val;
lm3644_pinctrl_set(
LM3644_PINCTRL_PIN_HWEN, LM3644_PINCTRL_PINSTATE_HIGH);
msleep(20);
/* get silicon revision */
is_lm3644tt = lm3644_read_reg(lm3644_i2c_client, LM3644_REG_DEVICE_ID);
pr_info("LM3644(TT) revision(%d).\n", is_lm3644tt);
/* clear enable register */
reg = LM3644_REG_ENABLE;
val = LM3644_DISABLE;
ret = lm3644_write_reg(lm3644_i2c_client, reg, val);
lm3644_reg_enable = val;
/* set torch current ramp time and flash timeout */
reg = LM3644_REG_TIMING_CONF;
if (is_lm3644tt)
val = LM3644_TORCH_RAMP_TIME | LM3644TT_FLASH_TIMEOUT;
else
val = LM3644_TORCH_RAMP_TIME | LM3644_FLASH_TIMEOUT;
ret = lm3644_write_reg(lm3644_i2c_client, reg, val);
return ret;
}
/* flashlight uninit */
int lm3644_uninit(void)
{
lm3644_disable(LM3644_CHANNEL_CH1);
lm3644_disable(LM3644_CHANNEL_CH2);
lm3644_pinctrl_set(
LM3644_PINCTRL_PIN_HWEN, LM3644_PINCTRL_PINSTATE_LOW);
return 0;
}
/******************************************************************************
* Timer and work queue
*****************************************************************************/
static struct hrtimer lm3644_timer_ch1;
static struct hrtimer lm3644_timer_ch2;
static unsigned int lm3644_timeout_ms[LM3644_CHANNEL_NUM];
static void lm3644_work_disable_ch1(struct work_struct *data)
{
pr_debug("ht work queue callback\n");
lm3644_disable_ch1();
}
static void lm3644_work_disable_ch2(struct work_struct *data)
{
pr_debug("lt work queue callback\n");
lm3644_disable_ch2();
}
static enum hrtimer_restart lm3644_timer_func_ch1(struct hrtimer *timer)
{
schedule_work(&lm3644_work_ch1);
return HRTIMER_NORESTART;
}
static enum hrtimer_restart lm3644_timer_func_ch2(struct hrtimer *timer)
{
schedule_work(&lm3644_work_ch2);
return HRTIMER_NORESTART;
}
static int lm3644_timer_start(int channel, ktime_t ktime)
{
if (channel == LM3644_CHANNEL_CH1)
hrtimer_start(&lm3644_timer_ch1, ktime, HRTIMER_MODE_REL);
else if (channel == LM3644_CHANNEL_CH2)
hrtimer_start(&lm3644_timer_ch2, ktime, HRTIMER_MODE_REL);
else {
pr_info("Error channel\n");
return -1;
}
return 0;
}
static int lm3644_timer_cancel(int channel)
{
if (channel == LM3644_CHANNEL_CH1)
hrtimer_cancel(&lm3644_timer_ch1);
else if (channel == LM3644_CHANNEL_CH2)
hrtimer_cancel(&lm3644_timer_ch2);
else {
pr_info("Error channel\n");
return -1;
}
return 0;
}
/******************************************************************************
* Flashlight operations
*****************************************************************************/
static int lm3644_ioctl(unsigned int cmd, unsigned long arg)
{
struct flashlight_dev_arg *fl_arg;
int channel;
ktime_t ktime;
unsigned int s;
unsigned int ns;
fl_arg = (struct flashlight_dev_arg *)arg;
channel = fl_arg->channel;
/* verify channel */
if (channel < 0 || channel >= LM3644_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);
lm3644_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);
lm3644_set_level(channel, fl_arg->arg);
break;
case FLASH_IOC_SET_ONOFF:
pr_debug("FLASH_IOC_SET_ONOFF(%d): %d\n",
channel, (int)fl_arg->arg);
if (fl_arg->arg == 1) {
if (lm3644_timeout_ms[channel]) {
s = lm3644_timeout_ms[channel] / 1000;
ns = lm3644_timeout_ms[channel] % 1000 *
1000000;
ktime = ktime_set(s, ns);
lm3644_timer_start(channel, ktime);
}
lm3644_enable(channel);
} else {
lm3644_disable(channel);
lm3644_timer_cancel(channel);
}
break;
case FLASH_IOC_GET_DUTY_NUMBER:
pr_debug("FLASH_IOC_GET_DUTY_NUMBER(%d)\n", channel);
fl_arg->arg = LM3644_LEVEL_NUM;
break;
case FLASH_IOC_GET_MAX_TORCH_DUTY:
pr_debug("FLASH_IOC_GET_MAX_TORCH_DUTY(%d)\n", channel);
fl_arg->arg = LM3644_LEVEL_TORCH - 1;
break;
case FLASH_IOC_GET_DUTY_CURRENT:
fl_arg->arg = lm3644_verify_level(fl_arg->arg);
pr_debug("FLASH_IOC_GET_DUTY_CURRENT(%d): %d\n",
channel, (int)fl_arg->arg);
fl_arg->arg = lm3644_current[fl_arg->arg];
break;
case FLASH_IOC_GET_HW_TIMEOUT:
pr_debug("FLASH_IOC_GET_HW_TIMEOUT(%d)\n", channel);
fl_arg->arg = LM3644_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 lm3644_open(void)
{
/* Move to set driver for saving power */
return 0;
}
static int lm3644_release(void)
{
/* Move to set driver for saving power */
return 0;
}
static int lm3644_set_driver(int set)
{
int ret = 0;
/* set chip and usage count */
mutex_lock(&lm3644_mutex);
if (set) {
if (!use_count)
ret = lm3644_init();
use_count++;
pr_debug("Set driver: %d\n", use_count);
} else {
use_count--;
if (!use_count)
ret = lm3644_uninit();
if (use_count < 0)
use_count = 0;
pr_debug("Unset driver: %d\n", use_count);
}
mutex_unlock(&lm3644_mutex);
return ret;
}
static ssize_t lm3644_strobe_store(struct flashlight_arg arg)
{
lm3644_set_driver(1);
lm3644_set_level(arg.channel, arg.level);
lm3644_timeout_ms[arg.channel] = 0;
lm3644_enable(arg.channel);
msleep(arg.dur);
lm3644_disable(arg.channel);
lm3644_set_driver(0);
return 0;
}
static struct flashlight_operations lm3644_ops = {
lm3644_open,
lm3644_release,
lm3644_ioctl,
lm3644_strobe_store,
lm3644_set_driver
};
/******************************************************************************
* I2C device and driver
*****************************************************************************/
static int lm3644_chip_init(struct lm3644_chip_data *chip)
{
/* NOTE: Chip initialication move to "set driver" for power saving.
* lm3644_init();
*/
return 0;
}
static int lm3644_parse_dt(struct device *dev,
struct lm3644_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,
LM3644_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 lm3644_i2c_probe(
struct i2c_client *client, const struct i2c_device_id *id)
{
struct lm3644_chip_data *chip;
int err;
int i;
pr_debug("i2c probe start.\n");
/* check i2c */
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
pr_info("Failed to check i2c functionality.\n");
err = -ENODEV;
goto err_out;
}
/* init chip private data */
chip = kzalloc(sizeof(struct lm3644_chip_data), GFP_KERNEL);
if (!chip) {
err = -ENOMEM;
goto err_out;
}
chip->client = client;
i2c_set_clientdata(client, chip);
lm3644_i2c_client = client;
/* init mutex and spinlock */
mutex_init(&chip->lock);
/* init chip hw */
lm3644_chip_init(chip);
/* check flashlight device */
pr_info("lm3644 LM3644_DEVICE_ID = %d\n",
lm3644_read_reg(lm3644_i2c_client, LM3644_DEVICE_ID));
if (lm3644_read_reg(lm3644_i2c_client, LM3644_DEVICE_ID) != 0x02) {
pr_info("lm3644 in not available\n");
if (lm3644_pdata->channel_num) {
for (i = 0; i < lm3644_pdata->channel_num; i++)
flashlight_dev_unregister_by_device_id(
&lm3644_pdata->dev_id[i]);
}
if (lm3644_pinctrl)
devm_pinctrl_put(lm3644_pinctrl);
err = -EFAULT;
goto err_free;
}
pr_debug("i2c probe done.\n");
return 0;
err_free:
i2c_set_clientdata(client, NULL);
kfree(chip);
err_out:
return err;
}
static int lm3644_i2c_remove(struct i2c_client *client)
{
struct lm3644_chip_data *chip = i2c_get_clientdata(client);
pr_debug("Remove start.\n");
client->dev.platform_data = NULL;
/* free resource */
kfree(chip);
pr_debug("Remove done.\n");
return 0;
}
static const struct i2c_device_id lm3644_i2c_id[] = {
{LM3644_NAME, 0},
{}
};
#ifdef CONFIG_OF
static const struct of_device_id lm3644_i2c_of_match[] = {
{.compatible = LM3644_DTNAME_I2C},
{},
};
#endif
static struct i2c_driver lm3644_i2c_driver = {
.driver = {
.name = LM3644_NAME,
#ifdef CONFIG_OF
.of_match_table = lm3644_i2c_of_match,
#endif
},
.probe = lm3644_i2c_probe,
.remove = lm3644_i2c_remove,
.id_table = lm3644_i2c_id,
};
/******************************************************************************
* Platform device and driver
*****************************************************************************/
static int lm3644_probe(struct platform_device *pdev)
{
struct lm3644_platform_data *pdata = dev_get_platdata(&pdev->dev);
int err;
int i;
pr_debug("Probe start.\n");
/* init pinctrl */
if (lm3644_pinctrl_init(pdev)) {
pr_debug("Failed to init pinctrl.\n");
return -1;
}
if (i2c_add_driver(&lm3644_i2c_driver)) {
pr_debug("Failed to add i2c driver.\n");
return -1;
}
/* init platform data */
if (!pdata) {
pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata) {
err = -ENOMEM;
goto err_free;
}
pdev->dev.platform_data = pdata;
err = lm3644_parse_dt(&pdev->dev, pdata);
if (err)
goto err_free;
}
lm3644_pdata = pdata;
/* init work queue */
INIT_WORK(&lm3644_work_ch1, lm3644_work_disable_ch1);
INIT_WORK(&lm3644_work_ch2, lm3644_work_disable_ch2);
/* init timer */
hrtimer_init(&lm3644_timer_ch1, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
lm3644_timer_ch1.function = lm3644_timer_func_ch1;
hrtimer_init(&lm3644_timer_ch2, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
lm3644_timer_ch2.function = lm3644_timer_func_ch2;
lm3644_timeout_ms[LM3644_CHANNEL_CH1] = 100;
lm3644_timeout_ms[LM3644_CHANNEL_CH2] = 100;
/* clear usage count */
use_count = 0;
/* 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],
&lm3644_ops)) {
err = -EFAULT;
goto err_free;
}
} else {
if (flashlight_dev_register(LM3644_NAME, &lm3644_ops)) {
err = -EFAULT;
goto err_free;
}
}
pr_debug("Probe done.\n");
return 0;
err_free:
return err;
}
static int lm3644_remove(struct platform_device *pdev)
{
struct lm3644_platform_data *pdata = dev_get_platdata(&pdev->dev);
int i;
pr_debug("Remove start.\n");
i2c_del_driver(&lm3644_i2c_driver);
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(LM3644_NAME);
/* flush work queue */
flush_work(&lm3644_work_ch1);
flush_work(&lm3644_work_ch2);
pr_debug("Remove done.\n");
return 0;
}
#ifdef CONFIG_OF
static const struct of_device_id lm3644_of_match[] = {
{.compatible = LM3644_DTNAME},
{},
};
MODULE_DEVICE_TABLE(of, lm3644_of_match);
#else
static struct platform_device lm3644_platform_device[] = {
{
.name = LM3644_NAME,
.id = 0,
.dev = {}
},
{}
};
MODULE_DEVICE_TABLE(platform, lm3644_platform_device);
#endif
static struct platform_driver lm3644_platform_driver = {
.probe = lm3644_probe,
.remove = lm3644_remove,
.driver = {
.name = LM3644_NAME,
.owner = THIS_MODULE,
#ifdef CONFIG_OF
.of_match_table = lm3644_of_match,
#endif
},
};
static int __init flashlight_lm3644_init(void)
{
int ret;
pr_debug("Init start.\n");
#ifndef CONFIG_OF
ret = platform_device_register(&lm3644_platform_device);
if (ret) {
pr_info("Failed to register platform device\n");
return ret;
}
#endif
ret = platform_driver_register(&lm3644_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_lm3644_exit(void)
{
pr_debug("Exit start.\n");
platform_driver_unregister(&lm3644_platform_driver);
pr_debug("Exit done.\n");
}
module_init(flashlight_lm3644_init);
module_exit(flashlight_lm3644_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Ziyu Jiang <jiangziyu@meizu.com>");
MODULE_DESCRIPTION("MTK Flashlight LM3644 Driver");
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