提交 57a53297 编写于 作者: D Dan Murphy 提交者: Jacek Anaszewski

leds: lm3601x: Introduce the lm3601x LED driver

Introduce the family of LED devices that can
drive a torch, strobe or IR LED.

The LED driver can be configured with a strobe
timer to execute a strobe flash.  The IR LED
brightness is controlled via the torch brightness
register.

The data sheet for each the LM36010 and LM36011
LED drivers can be found here:
http://www.ti.com/product/LM36010
http://www.ti.com/product/LM36011Signed-off-by: NDan Murphy <dmurphy@ti.com>
Reviewed-by: NAndy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: NJacek Anaszewski <jacek.anaszewski@gmail.com>
上级 2f8270de
...@@ -158,6 +158,15 @@ config LEDS_LM3692X ...@@ -158,6 +158,15 @@ config LEDS_LM3692X
This option enables support for the TI LM3692x family This option enables support for the TI LM3692x family
of white LED string drivers used for backlighting. of white LED string drivers used for backlighting.
config LEDS_LM3601X
tristate "LED support for LM3601x Chips"
depends on LEDS_CLASS && I2C
depends on LEDS_CLASS_FLASH
select REGMAP_I2C
help
This option enables support for the TI LM3601x family
of flash, torch and indicator classes.
config LEDS_LOCOMO config LEDS_LOCOMO
tristate "LED Support for Locomo device" tristate "LED Support for Locomo device"
depends on LEDS_CLASS depends on LEDS_CLASS
......
...@@ -77,6 +77,7 @@ obj-$(CONFIG_LEDS_NIC78BX) += leds-nic78bx.o ...@@ -77,6 +77,7 @@ obj-$(CONFIG_LEDS_NIC78BX) += leds-nic78bx.o
obj-$(CONFIG_LEDS_MT6323) += leds-mt6323.o obj-$(CONFIG_LEDS_MT6323) += leds-mt6323.o
obj-$(CONFIG_LEDS_LM3692X) += leds-lm3692x.o obj-$(CONFIG_LEDS_LM3692X) += leds-lm3692x.o
obj-$(CONFIG_LEDS_SC27XX_BLTC) += leds-sc27xx-bltc.o obj-$(CONFIG_LEDS_SC27XX_BLTC) += leds-sc27xx-bltc.o
obj-$(CONFIG_LEDS_LM3601X) += leds-lm3601x.o
# LED SPI Drivers # LED SPI Drivers
obj-$(CONFIG_LEDS_CR0014114) += leds-cr0014114.o obj-$(CONFIG_LEDS_CR0014114) += leds-cr0014114.o
......
// 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 - http://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>
#include <uapi/linux/uleds.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;
char led_name[LED_MAX_NAME_SIZE];
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 led_classdev *led_cdev;
struct led_flash_setting *setting;
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->name = led->led_name;
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;
return led_classdev_flash_register(&led->client->dev, &led->fled_cdev);
}
static int lm3601x_parse_node(struct lm3601x_led *led)
{
struct fwnode_handle *child = NULL;
int ret = -ENODEV;
const char *name;
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_string(child, "label", &name);
if (ret) {
if (led->led_mode == LM3601X_LED_TORCH)
name = "torch";
else
name = "infrared";
}
snprintf(led->led_name, sizeof(led->led_name),
"%s:%s", led->client->name, name);
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;
}
out_err:
fwnode_handle_put(child);
return ret;
}
static int lm3601x_probe(struct i2c_client *client)
{
struct lm3601x_led *led;
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);
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);
}
static int lm3601x_remove(struct i2c_client *client)
{
struct lm3601x_led *led = i2c_get_clientdata(client);
led_classdev_flash_unregister(&led->fled_cdev);
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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