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linux-sg2042/drivers/leds/leds-lm3601x.c

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// SPDX-License-Identifier: GPL-2.0
// Flash and torch driver for Texas Instruments LM3601X LED
// Flash driver chip family
// Copyright (C) 2018 Texas Instruments Incorporated - https://www.ti.com/
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/leds.h>
#include <linux/led-class-flash.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#define LM3601X_LED_IR 0x0
#define LM3601X_LED_TORCH 0x1
/* Registers */
#define LM3601X_ENABLE_REG 0x01
#define LM3601X_CFG_REG 0x02
#define LM3601X_LED_FLASH_REG 0x03
#define LM3601X_LED_TORCH_REG 0x04
#define LM3601X_FLAGS_REG 0x05
#define LM3601X_DEV_ID_REG 0x06
#define LM3601X_SW_RESET BIT(7)
/* Enable Mode bits */
#define LM3601X_MODE_STANDBY 0x00
#define LM3601X_MODE_IR_DRV BIT(0)
#define LM3601X_MODE_TORCH BIT(1)
#define LM3601X_MODE_STROBE (BIT(0) | BIT(1))
#define LM3601X_STRB_EN BIT(2)
#define LM3601X_STRB_EDGE_TRIG BIT(3)
#define LM3601X_IVFM_EN BIT(4)
#define LM36010_BOOST_LIMIT_28 BIT(5)
#define LM36010_BOOST_FREQ_4MHZ BIT(6)
#define LM36010_BOOST_MODE_PASS BIT(7)
/* Flag Mask */
#define LM3601X_FLASH_TIME_OUT BIT(0)
#define LM3601X_UVLO_FAULT BIT(1)
#define LM3601X_THERM_SHUTDOWN BIT(2)
#define LM3601X_THERM_CURR BIT(3)
#define LM36010_CURR_LIMIT BIT(4)
#define LM3601X_SHORT_FAULT BIT(5)
#define LM3601X_IVFM_TRIP BIT(6)
#define LM36010_OVP_FAULT BIT(7)
#define LM3601X_MAX_TORCH_I_UA 376000
#define LM3601X_MIN_TORCH_I_UA 2400
#define LM3601X_TORCH_REG_DIV 2965
#define LM3601X_MAX_STROBE_I_UA 1500000
#define LM3601X_MIN_STROBE_I_UA 11000
#define LM3601X_STROBE_REG_DIV 11800
#define LM3601X_TIMEOUT_MASK 0x1e
#define LM3601X_ENABLE_MASK (LM3601X_MODE_IR_DRV | LM3601X_MODE_TORCH)
#define LM3601X_LOWER_STEP_US 40000
#define LM3601X_UPPER_STEP_US 200000
#define LM3601X_MIN_TIMEOUT_US 40000
#define LM3601X_MAX_TIMEOUT_US 1600000
#define LM3601X_TIMEOUT_XOVER_US 400000
enum lm3601x_type {
CHIP_LM36010 = 0,
CHIP_LM36011,
};
/**
* struct lm3601x_led -
* @fled_cdev: flash LED class device pointer
* @client: Pointer to the I2C client
* @regmap: Devices register map
* @lock: Lock for reading/writing the device
* @led_name: LED label for the Torch or IR LED
* @flash_timeout: the timeout for the flash
* @last_flag: last known flags register value
* @torch_current_max: maximum current for the torch
* @flash_current_max: maximum current for the flash
* @max_flash_timeout: maximum timeout for the flash
* @led_mode: The mode to enable either IR or Torch
*/
struct lm3601x_led {
struct led_classdev_flash fled_cdev;
struct i2c_client *client;
struct regmap *regmap;
struct mutex lock;
unsigned int flash_timeout;
unsigned int last_flag;
u32 torch_current_max;
u32 flash_current_max;
u32 max_flash_timeout;
u32 led_mode;
};
static const struct reg_default lm3601x_regmap_defs[] = {
{ LM3601X_ENABLE_REG, 0x20 },
{ LM3601X_CFG_REG, 0x15 },
{ LM3601X_LED_FLASH_REG, 0x00 },
{ LM3601X_LED_TORCH_REG, 0x00 },
};
static bool lm3601x_volatile_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case LM3601X_FLAGS_REG:
return true;
default:
return false;
}
}
static const struct regmap_config lm3601x_regmap = {
.reg_bits = 8,
.val_bits = 8,
.max_register = LM3601X_DEV_ID_REG,
.reg_defaults = lm3601x_regmap_defs,
.num_reg_defaults = ARRAY_SIZE(lm3601x_regmap_defs),
.cache_type = REGCACHE_RBTREE,
.volatile_reg = lm3601x_volatile_reg,
};
static struct lm3601x_led *fled_cdev_to_led(struct led_classdev_flash *fled_cdev)
{
return container_of(fled_cdev, struct lm3601x_led, fled_cdev);
}
static int lm3601x_read_faults(struct lm3601x_led *led)
{
int flags_val;
int ret;
ret = regmap_read(led->regmap, LM3601X_FLAGS_REG, &flags_val);
if (ret < 0)
return -EIO;
led->last_flag = 0;
if (flags_val & LM36010_OVP_FAULT)
led->last_flag |= LED_FAULT_OVER_VOLTAGE;
if (flags_val & (LM3601X_THERM_SHUTDOWN | LM3601X_THERM_CURR))
led->last_flag |= LED_FAULT_OVER_TEMPERATURE;
if (flags_val & LM3601X_SHORT_FAULT)
led->last_flag |= LED_FAULT_SHORT_CIRCUIT;
if (flags_val & LM36010_CURR_LIMIT)
led->last_flag |= LED_FAULT_OVER_CURRENT;
if (flags_val & LM3601X_UVLO_FAULT)
led->last_flag |= LED_FAULT_UNDER_VOLTAGE;
if (flags_val & LM3601X_IVFM_TRIP)
led->last_flag |= LED_FAULT_INPUT_VOLTAGE;
if (flags_val & LM3601X_THERM_SHUTDOWN)
led->last_flag |= LED_FAULT_LED_OVER_TEMPERATURE;
return led->last_flag;
}
static int lm3601x_brightness_set(struct led_classdev *cdev,
enum led_brightness brightness)
{
struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(cdev);
struct lm3601x_led *led = fled_cdev_to_led(fled_cdev);
int ret, led_mode_val;
mutex_lock(&led->lock);
ret = lm3601x_read_faults(led);
if (ret < 0)
goto out;
if (led->led_mode == LM3601X_LED_TORCH)
led_mode_val = LM3601X_MODE_TORCH;
else
led_mode_val = LM3601X_MODE_IR_DRV;
if (brightness == LED_OFF) {
ret = regmap_update_bits(led->regmap, LM3601X_ENABLE_REG,
led_mode_val, LED_OFF);
goto out;
}
ret = regmap_write(led->regmap, LM3601X_LED_TORCH_REG, brightness);
if (ret < 0)
goto out;
ret = regmap_update_bits(led->regmap, LM3601X_ENABLE_REG,
LM3601X_MODE_TORCH | LM3601X_MODE_IR_DRV,
led_mode_val);
out:
mutex_unlock(&led->lock);
return ret;
}
static int lm3601x_strobe_set(struct led_classdev_flash *fled_cdev,
bool state)
{
struct lm3601x_led *led = fled_cdev_to_led(fled_cdev);
int timeout_reg_val;
int current_timeout;
int ret;
mutex_lock(&led->lock);
ret = regmap_read(led->regmap, LM3601X_CFG_REG, &current_timeout);
if (ret < 0)
goto out;
if (led->flash_timeout >= LM3601X_TIMEOUT_XOVER_US)
timeout_reg_val = led->flash_timeout / LM3601X_UPPER_STEP_US + 0x07;
else
timeout_reg_val = led->flash_timeout / LM3601X_LOWER_STEP_US - 0x01;
if (led->flash_timeout != current_timeout)
ret = regmap_update_bits(led->regmap, LM3601X_CFG_REG,
LM3601X_TIMEOUT_MASK, timeout_reg_val);
if (state)
ret = regmap_update_bits(led->regmap, LM3601X_ENABLE_REG,
LM3601X_MODE_TORCH | LM3601X_MODE_IR_DRV,
LM3601X_MODE_STROBE);
else
ret = regmap_update_bits(led->regmap, LM3601X_ENABLE_REG,
LM3601X_MODE_STROBE, LED_OFF);
ret = lm3601x_read_faults(led);
out:
mutex_unlock(&led->lock);
return ret;
}
static int lm3601x_flash_brightness_set(struct led_classdev_flash *fled_cdev,
u32 brightness)
{
struct lm3601x_led *led = fled_cdev_to_led(fled_cdev);
u8 brightness_val;
int ret;
mutex_lock(&led->lock);
ret = lm3601x_read_faults(led);
if (ret < 0)
goto out;
if (brightness == LED_OFF) {
ret = regmap_update_bits(led->regmap, LM3601X_ENABLE_REG,
LM3601X_MODE_STROBE, LED_OFF);
goto out;
}
brightness_val = brightness / LM3601X_STROBE_REG_DIV;
ret = regmap_write(led->regmap, LM3601X_LED_FLASH_REG, brightness_val);
out:
mutex_unlock(&led->lock);
return ret;
}
static int lm3601x_flash_timeout_set(struct led_classdev_flash *fled_cdev,
u32 timeout)
{
struct lm3601x_led *led = fled_cdev_to_led(fled_cdev);
mutex_lock(&led->lock);
led->flash_timeout = timeout;
mutex_unlock(&led->lock);
return 0;
}
static int lm3601x_strobe_get(struct led_classdev_flash *fled_cdev, bool *state)
{
struct lm3601x_led *led = fled_cdev_to_led(fled_cdev);
int strobe_state;
int ret;
mutex_lock(&led->lock);
ret = regmap_read(led->regmap, LM3601X_ENABLE_REG, &strobe_state);
if (ret < 0)
goto out;
*state = strobe_state & LM3601X_MODE_STROBE;
out:
mutex_unlock(&led->lock);
return ret;
}
static int lm3601x_flash_fault_get(struct led_classdev_flash *fled_cdev,
u32 *fault)
{
struct lm3601x_led *led = fled_cdev_to_led(fled_cdev);
lm3601x_read_faults(led);
*fault = led->last_flag;
return 0;
}
static const struct led_flash_ops flash_ops = {
.flash_brightness_set = lm3601x_flash_brightness_set,
.strobe_set = lm3601x_strobe_set,
.strobe_get = lm3601x_strobe_get,
.timeout_set = lm3601x_flash_timeout_set,
.fault_get = lm3601x_flash_fault_get,
};
static int lm3601x_register_leds(struct lm3601x_led *led,
struct fwnode_handle *fwnode)
{
struct led_classdev *led_cdev;
struct led_flash_setting *setting;
struct led_init_data init_data = {};
led->fled_cdev.ops = &flash_ops;
setting = &led->fled_cdev.timeout;
setting->min = LM3601X_MIN_TIMEOUT_US;
setting->max = led->max_flash_timeout;
setting->step = LM3601X_LOWER_STEP_US;
setting->val = led->max_flash_timeout;
setting = &led->fled_cdev.brightness;
setting->min = LM3601X_MIN_STROBE_I_UA;
setting->max = led->flash_current_max;
setting->step = LM3601X_TORCH_REG_DIV;
setting->val = led->flash_current_max;
led_cdev = &led->fled_cdev.led_cdev;
led_cdev->brightness_set_blocking = lm3601x_brightness_set;
led_cdev->max_brightness = DIV_ROUND_UP(led->torch_current_max,
LM3601X_TORCH_REG_DIV);
led_cdev->flags |= LED_DEV_CAP_FLASH;
init_data.fwnode = fwnode;
init_data.devicename = led->client->name;
init_data.default_label = (led->led_mode == LM3601X_LED_TORCH) ?
"torch" : "infrared";
return devm_led_classdev_flash_register_ext(&led->client->dev,
&led->fled_cdev, &init_data);
}
static int lm3601x_parse_node(struct lm3601x_led *led,
struct fwnode_handle **fwnode)
{
struct fwnode_handle *child = NULL;
int ret = -ENODEV;
child = device_get_next_child_node(&led->client->dev, child);
if (!child) {
dev_err(&led->client->dev, "No LED Child node\n");
return ret;
}
ret = fwnode_property_read_u32(child, "reg", &led->led_mode);
if (ret) {
dev_err(&led->client->dev, "reg DT property missing\n");
goto out_err;
}
if (led->led_mode > LM3601X_LED_TORCH ||
led->led_mode < LM3601X_LED_IR) {
dev_warn(&led->client->dev, "Invalid led mode requested\n");
ret = -EINVAL;
goto out_err;
}
ret = fwnode_property_read_u32(child, "led-max-microamp",
&led->torch_current_max);
if (ret) {
dev_warn(&led->client->dev,
"led-max-microamp DT property missing\n");
goto out_err;
}
ret = fwnode_property_read_u32(child, "flash-max-microamp",
&led->flash_current_max);
if (ret) {
dev_warn(&led->client->dev,
"flash-max-microamp DT property missing\n");
goto out_err;
}
ret = fwnode_property_read_u32(child, "flash-max-timeout-us",
&led->max_flash_timeout);
if (ret) {
dev_warn(&led->client->dev,
"flash-max-timeout-us DT property missing\n");
goto out_err;
}
*fwnode = child;
out_err:
fwnode_handle_put(child);
return ret;
}
static int lm3601x_probe(struct i2c_client *client)
{
struct lm3601x_led *led;
struct fwnode_handle *fwnode;
int ret;
led = devm_kzalloc(&client->dev, sizeof(*led), GFP_KERNEL);
if (!led)
return -ENOMEM;
led->client = client;
i2c_set_clientdata(client, led);
ret = lm3601x_parse_node(led, &fwnode);
if (ret)
return -ENODEV;
led->regmap = devm_regmap_init_i2c(client, &lm3601x_regmap);
if (IS_ERR(led->regmap)) {
ret = PTR_ERR(led->regmap);
dev_err(&client->dev,
"Failed to allocate register map: %d\n", ret);
return ret;
}
mutex_init(&led->lock);
return lm3601x_register_leds(led, fwnode);
}
static int lm3601x_remove(struct i2c_client *client)
{
struct lm3601x_led *led = i2c_get_clientdata(client);
mutex_destroy(&led->lock);
return regmap_update_bits(led->regmap, LM3601X_ENABLE_REG,
LM3601X_ENABLE_MASK,
LM3601X_MODE_STANDBY);
}
static const struct i2c_device_id lm3601x_id[] = {
{ "LM36010", CHIP_LM36010 },
{ "LM36011", CHIP_LM36011 },
{ }
};
MODULE_DEVICE_TABLE(i2c, lm3601x_id);
static const struct of_device_id of_lm3601x_leds_match[] = {
{ .compatible = "ti,lm36010", },
{ .compatible = "ti,lm36011", },
{ }
};
MODULE_DEVICE_TABLE(of, of_lm3601x_leds_match);
static struct i2c_driver lm3601x_i2c_driver = {
.driver = {
.name = "lm3601x",
.of_match_table = of_lm3601x_leds_match,
},
.probe_new = lm3601x_probe,
.remove = lm3601x_remove,
.id_table = lm3601x_id,
};
module_i2c_driver(lm3601x_i2c_driver);
MODULE_DESCRIPTION("Texas Instruments Flash Lighting driver for LM3601X");
MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");
MODULE_LICENSE("GPL v2");
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