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// SPDX-License-Identifier: GPL-2.0
// TI LM3697 LED chip family driver
// Copyright (C) 2018 Texas Instruments Incorporated - https://www.ti.com/
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/regulator/consumer.h>
#include <linux/leds-ti-lmu-common.h>
#define LM3697_REV 0x0
#define LM3697_RESET 0x1
#define LM3697_OUTPUT_CONFIG 0x10
#define LM3697_CTRL_A_RAMP 0x11
#define LM3697_CTRL_B_RAMP 0x12
#define LM3697_CTRL_A_B_RT_RAMP 0x13
#define LM3697_CTRL_A_B_RAMP_CFG 0x14
#define LM3697_CTRL_A_B_BRT_CFG 0x16
#define LM3697_CTRL_A_FS_CURR_CFG 0x17
#define LM3697_CTRL_B_FS_CURR_CFG 0x18
#define LM3697_PWM_CFG 0x1c
#define LM3697_CTRL_A_BRT_LSB 0x20
#define LM3697_CTRL_A_BRT_MSB 0x21
#define LM3697_CTRL_B_BRT_LSB 0x22
#define LM3697_CTRL_B_BRT_MSB 0x23
#define LM3697_CTRL_ENABLE 0x24
#define LM3697_SW_RESET BIT(0)
#define LM3697_CTRL_A_EN BIT(0)
#define LM3697_CTRL_B_EN BIT(1)
#define LM3697_CTRL_A_B_EN (LM3697_CTRL_A_EN | LM3697_CTRL_B_EN)
#define LM3697_MAX_LED_STRINGS 3
#define LM3697_CONTROL_A 0
#define LM3697_CONTROL_B 1
#define LM3697_MAX_CONTROL_BANKS 2
/**
* struct lm3697_led -
* @hvled_strings: Array of LED strings associated with a control bank
* @label: LED label
* @led_dev: LED class device
* @priv: Pointer to the device struct
* @lmu_data: Register and setting values for common code
* @control_bank: Control bank the LED is associated to. 0 is control bank A
* 1 is control bank B
*/
struct lm3697_led {
u32 hvled_strings[LM3697_MAX_LED_STRINGS];
char label[LED_MAX_NAME_SIZE];
struct led_classdev led_dev;
struct lm3697 *priv;
struct ti_lmu_bank lmu_data;
int control_bank;
int enabled;
int num_leds;
};
/**
* struct lm3697 -
* @enable_gpio: Hardware enable gpio
* @regulator: LED supply regulator pointer
* @client: Pointer to the I2C client
* @regmap: Devices register map
* @dev: Pointer to the devices device struct
* @lock: Lock for reading/writing the device
* @leds: Array of LED strings
*/
struct lm3697 {
struct gpio_desc *enable_gpio;
struct regulator *regulator;
struct i2c_client *client;
struct regmap *regmap;
struct device *dev;
struct mutex lock;
int bank_cfg;
struct lm3697_led leds[];
};
static const struct reg_default lm3697_reg_defs[] = {
{LM3697_OUTPUT_CONFIG, 0x6},
{LM3697_CTRL_A_RAMP, 0x0},
{LM3697_CTRL_B_RAMP, 0x0},
{LM3697_CTRL_A_B_RT_RAMP, 0x0},
{LM3697_CTRL_A_B_RAMP_CFG, 0x0},
{LM3697_CTRL_A_B_BRT_CFG, 0x0},
{LM3697_CTRL_A_FS_CURR_CFG, 0x13},
{LM3697_CTRL_B_FS_CURR_CFG, 0x13},
{LM3697_PWM_CFG, 0xc},
{LM3697_CTRL_A_BRT_LSB, 0x0},
{LM3697_CTRL_A_BRT_MSB, 0x0},
{LM3697_CTRL_B_BRT_LSB, 0x0},
{LM3697_CTRL_B_BRT_MSB, 0x0},
{LM3697_CTRL_ENABLE, 0x0},
};
static const struct regmap_config lm3697_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = LM3697_CTRL_ENABLE,
.reg_defaults = lm3697_reg_defs,
.num_reg_defaults = ARRAY_SIZE(lm3697_reg_defs),
.cache_type = REGCACHE_FLAT,
};
static int lm3697_brightness_set(struct led_classdev *led_cdev,
enum led_brightness brt_val)
{
struct lm3697_led *led = container_of(led_cdev, struct lm3697_led,
led_dev);
int ctrl_en_val = (1 << led->control_bank);
int ret;
mutex_lock(&led->priv->lock);
if (brt_val == LED_OFF) {
ret = regmap_update_bits(led->priv->regmap, LM3697_CTRL_ENABLE,
ctrl_en_val, ~ctrl_en_val);
if (ret) {
dev_err(&led->priv->client->dev, "Cannot write ctrl register\n");
goto brightness_out;
}
led->enabled = LED_OFF;
} else {
ret = ti_lmu_common_set_brightness(&led->lmu_data, brt_val);
if (ret) {
dev_err(&led->priv->client->dev,
"Cannot write brightness\n");
goto brightness_out;
}
if (!led->enabled) {
ret = regmap_update_bits(led->priv->regmap,
LM3697_CTRL_ENABLE,
ctrl_en_val, ctrl_en_val);
if (ret) {
dev_err(&led->priv->client->dev,
"Cannot enable the device\n");
goto brightness_out;
}
led->enabled = brt_val;
}
}
brightness_out:
mutex_unlock(&led->priv->lock);
return ret;
}
static int lm3697_init(struct lm3697 *priv)
{
struct lm3697_led *led;
int i, ret;
if (priv->enable_gpio) {
gpiod_direction_output(priv->enable_gpio, 1);
} else {
ret = regmap_write(priv->regmap, LM3697_RESET, LM3697_SW_RESET);
if (ret) {
dev_err(&priv->client->dev, "Cannot reset the device\n");
goto out;
}
}
ret = regmap_write(priv->regmap, LM3697_CTRL_ENABLE, 0x0);
if (ret) {
dev_err(&priv->client->dev, "Cannot write ctrl enable\n");
goto out;
}
ret = regmap_write(priv->regmap, LM3697_OUTPUT_CONFIG, priv->bank_cfg);
if (ret)
dev_err(&priv->client->dev, "Cannot write OUTPUT config\n");
for (i = 0; i < LM3697_MAX_CONTROL_BANKS; i++) {
led = &priv->leds[i];
ret = ti_lmu_common_set_ramp(&led->lmu_data);
if (ret)
dev_err(&priv->client->dev, "Setting the ramp rate failed\n");
}
out:
return ret;
}
static int lm3697_probe_dt(struct lm3697 *priv)
{
struct fwnode_handle *child = NULL;
struct lm3697_led *led;
const char *name;
int control_bank;
size_t i = 0;
int ret = -EINVAL;
int j;
priv->enable_gpio = devm_gpiod_get_optional(&priv->client->dev,
"enable", GPIOD_OUT_LOW);
if (IS_ERR(priv->enable_gpio)) {
ret = PTR_ERR(priv->enable_gpio);
dev_err(&priv->client->dev, "Failed to get enable gpio: %d\n",
ret);
return ret;
}
priv->regulator = devm_regulator_get(&priv->client->dev, "vled");
if (IS_ERR(priv->regulator))
priv->regulator = NULL;
device_for_each_child_node(priv->dev, child) {
ret = fwnode_property_read_u32(child, "reg", &control_bank);
if (ret) {
dev_err(&priv->client->dev, "reg property missing\n");
fwnode_handle_put(child);
goto child_out;
}
if (control_bank > LM3697_CONTROL_B) {
dev_err(&priv->client->dev, "reg property is invalid\n");
ret = -EINVAL;
fwnode_handle_put(child);
goto child_out;
}
led = &priv->leds[i];
ret = ti_lmu_common_get_brt_res(&priv->client->dev,
child, &led->lmu_data);
if (ret)
dev_warn(&priv->client->dev, "brightness resolution property missing\n");
led->control_bank = control_bank;
led->lmu_data.regmap = priv->regmap;
led->lmu_data.runtime_ramp_reg = LM3697_CTRL_A_RAMP +
control_bank;
led->lmu_data.msb_brightness_reg = LM3697_CTRL_A_BRT_MSB +
led->control_bank * 2;
led->lmu_data.lsb_brightness_reg = LM3697_CTRL_A_BRT_LSB +
led->control_bank * 2;
led->num_leds = fwnode_property_count_u32(child, "led-sources");
if (led->num_leds > LM3697_MAX_LED_STRINGS) {
dev_err(&priv->client->dev, "Too many LED strings defined\n");
continue;
}
ret = fwnode_property_read_u32_array(child, "led-sources",
led->hvled_strings,
led->num_leds);
if (ret) {
dev_err(&priv->client->dev, "led-sources property missing\n");
fwnode_handle_put(child);
goto child_out;
}
for (j = 0; j < led->num_leds; j++)
priv->bank_cfg |=
(led->control_bank << led->hvled_strings[j]);
ret = ti_lmu_common_get_ramp_params(&priv->client->dev,
child, &led->lmu_data);
if (ret)
dev_warn(&priv->client->dev, "runtime-ramp properties missing\n");
fwnode_property_read_string(child
|