#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/leds.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/gpio/consumer.h>
#include <linux/slab.h>
#define LP8860_DISP_CL1_BRT_MSB 0x00
#define LP8860_DISP_CL1_BRT_LSB 0x01
#define LP8860_DISP_CL1_CURR_MSB 0x02
#define LP8860_DISP_CL1_CURR_LSB 0x03
#define LP8860_CL2_BRT_MSB 0x04
#define LP8860_CL2_BRT_LSB 0x05
#define LP8860_CL2_CURRENT 0x06
#define LP8860_CL3_BRT_MSB 0x07
#define LP8860_CL3_BRT_LSB 0x08
#define LP8860_CL3_CURRENT 0x09
#define LP8860_CL4_BRT_MSB 0x0a
#define LP8860_CL4_BRT_LSB 0x0b
#define LP8860_CL4_CURRENT 0x0c
#define LP8860_CONFIG 0x0d
#define LP8860_STATUS 0x0e
#define LP8860_FAULT 0x0f
#define LP8860_LED_FAULT 0x10
#define LP8860_FAULT_CLEAR 0x11
#define LP8860_ID 0x12
#define LP8860_TEMP_MSB 0x13
#define LP8860_TEMP_LSB 0x14
#define LP8860_DISP_LED_CURR_MSB 0x15
#define LP8860_DISP_LED_CURR_LSB 0x16
#define LP8860_DISP_LED_PWM_MSB 0x17
#define LP8860_DISP_LED_PWM_LSB 0x18
#define LP8860_EEPROM_CNTRL 0x19
#define LP8860_EEPROM_UNLOCK 0x1a
#define LP8860_EEPROM_REG_0 0x60
#define LP8860_EEPROM_REG_1 0x61
#define LP8860_EEPROM_REG_2 0x62
#define LP8860_EEPROM_REG_3 0x63
#define LP8860_EEPROM_REG_4 0x64
#define LP8860_EEPROM_REG_5 0x65
#define LP8860_EEPROM_REG_6 0x66
#define LP8860_EEPROM_REG_7 0x67
#define LP8860_EEPROM_REG_8 0x68
#define LP8860_EEPROM_REG_9 0x69
#define LP8860_EEPROM_REG_10 0x6a
#define LP8860_EEPROM_REG_11 0x6b
#define LP8860_EEPROM_REG_12 0x6c
#define LP8860_EEPROM_REG_13 0x6d
#define LP8860_EEPROM_REG_14 0x6e
#define LP8860_EEPROM_REG_15 0x6f
#define LP8860_EEPROM_REG_16 0x70
#define LP8860_EEPROM_REG_17 0x71
#define LP8860_EEPROM_REG_18 0x72
#define LP8860_EEPROM_REG_19 0x73
#define LP8860_EEPROM_REG_20 0x74
#define LP8860_EEPROM_REG_21 0x75
#define LP8860_EEPROM_REG_22 0x76
#define LP8860_EEPROM_REG_23 0x77
#define LP8860_EEPROM_REG_24 0x78
#define LP8860_LOCK_EEPROM 0x00
#define LP8860_UNLOCK_EEPROM 0x01
#define LP8860_PROGRAM_EEPROM 0x02
#define LP8860_EEPROM_CODE_1 0x08
#define LP8860_EEPROM_CODE_2 0xba
#define LP8860_EEPROM_CODE_3 0xef
#define LP8860_CLEAR_FAULTS 0x01
#define LP8860_NAME "lp8860"
struct lp8860_led {
struct mutex lock;
struct i2c_client *client;
struct led_classdev led_dev;
struct regmap *regmap;
struct regmap *eeprom_regmap;
};
static const struct reg_sequence lp8860_eeprom_disp_regs[] = {
{ LP8860_EEPROM_REG_0, 0xed },
{ LP8860_EEPROM_REG_1, 0xdf },
{ LP8860_EEPROM_REG_2, 0xdc },
{ LP8860_EEPROM_REG_3, 0xf0 },
{ LP8860_EEPROM_REG_4, 0xdf },
{ LP8860_EEPROM_REG_5, 0xe5 },
{ LP8860_EEPROM_REG_6, 0xf2 },
{ LP8860_EEPROM_REG_7, 0x77 },
{ LP8860_EEPROM_REG_8, 0x77 },
{ LP8860_EEPROM_REG_9, 0x71 },
{ LP8860_EEPROM_REG_10, 0x3f },
{ LP8860_EEPROM_REG_11, 0xb7 },
{ LP8860_EEPROM_REG_12, 0x17 },
{ LP8860_EEPROM_REG_13, 0xef },
{ LP8860_EEPROM_REG_14, 0xb0 },
{ LP8860_EEPROM_REG_15, 0x87 },
{ LP8860_EEPROM_REG_16, 0xce },
{ LP8860_EEPROM_REG_17, 0x72 },
{ LP8860_EEPROM_REG_18, 0xe5 },
{ LP8860_EEPROM_REG_19, 0xdf },
{ LP8860_EEPROM_REG_20, 0x35 },
{ LP8860_EEPROM_REG_21, 0x06 },
{ LP8860_EEPROM_REG_22, 0xdc },
{ LP8860_EEPROM_REG_23, 0x88 },
{ LP8860_EEPROM_REG_24, 0x3E },
};
static int lp8860_unlock_eeprom(struct lp8860_led *led)
{
int ret;
guard(mutex)(&led->lock);
ret = regmap_write(led->regmap, LP8860_EEPROM_UNLOCK, LP8860_EEPROM_CODE_1);
if (ret) {
dev_err(&led->client->dev, "EEPROM Unlock failed\n");
return ret;
}
ret = regmap_write(led->regmap, LP8860_EEPROM_UNLOCK, LP8860_EEPROM_CODE_2);
if (ret) {
dev_err(&led->client->dev, "EEPROM Unlock failed\n");
return ret;
}
ret = regmap_write(led->regmap, LP8860_EEPROM_UNLOCK, LP8860_EEPROM_CODE_3);
if (ret) {
dev_err(&led->client->dev, "EEPROM Unlock failed\n");
return ret;
}
return ret;
}
static int lp8860_fault_check(struct lp8860_led *led)
{
int ret, fault;
unsigned int read_buf;
ret = regmap_read(led->regmap, LP8860_LED_FAULT, &read_buf);
if (ret)
goto out;
fault = read_buf;
ret = regmap_read(led->regmap, LP8860_FAULT, &read_buf);
if (ret)
goto out;
fault |= read_buf;
if (fault)
ret = regmap_write(led->regmap, LP8860_FAULT_CLEAR,
LP8860_CLEAR_FAULTS);
out:
return ret;
}
static int lp8860_brightness_set(struct led_classdev *led_cdev,
enum led_brightness brt_val)
{
struct lp8860_led *led =
container_of(led_cdev, struct lp8860_led, led_dev);
int disp_brightness = brt_val * 255;
int ret;
guard(mutex)(&led->lock);
ret = lp8860_fault_check(led);
if (ret) {
dev_err(&led->client->dev, "Cannot read/clear faults\n");
return ret;
}
ret = regmap_write(led->regmap, LP8860_DISP_CL1_BRT_MSB,
(disp_brightness & 0xff00) >> 8);
if (ret) {
dev_err(&led->client->dev, "Cannot write CL1 MSB\n");
return ret;
}
ret = regmap_write(led->regmap, LP8860_DISP_CL1_BRT_LSB,
disp_brightness & 0xff);
if (ret) {
dev_err(&led->client->dev, "Cannot write CL1 LSB\n");
return ret;
}
return 0;
}
static int lp8860_init(struct lp8860_led *led)
{
unsigned int read_buf;
int ret, reg_count;
ret = lp8860_fault_check(led);
if (ret)
goto out;
ret = regmap_read(led->regmap, LP8860_STATUS, &read_buf);
if (ret)
goto out;
ret = lp8860_unlock_eeprom(led);
if (ret) {
dev_err(&led->client->dev, "Failed unlocking EEPROM\n");
goto out;
}
reg_count = ARRAY_SIZE(lp8860_eeprom_disp_regs);
ret = regmap_multi_reg_write(led->eeprom_regmap, lp8860_eeprom_disp_regs, reg_count);
if (ret) {
dev_err(&led->client->dev, "Failed writing EEPROM\n");
goto out;
}
ret = regmap_write(led->regmap, LP8860_EEPROM_UNLOCK, LP8860_LOCK_EEPROM);
if (ret)
goto out;
ret = regmap_write(led->regmap,
LP8860_EEPROM_CNTRL,
LP8860_PROGRAM_EEPROM);
if (ret) {
dev_err(&led->client->dev, "Failed programming EEPROM\n");
goto out;
}
return ret;
out:
return ret;
}
static const struct regmap_config lp8860_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = LP8860_EEPROM_UNLOCK,
};
static const struct regmap_config lp8860_eeprom_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = LP8860_EEPROM_REG_24,
};
static void lp8860_disable_gpio(void *data)
{
struct gpio_desc *gpio = data;
gpiod_set_value(gpio, 0);
}
static int lp8860_probe(struct i2c_client *client)
{
int ret;
struct lp8860_led *led;
struct device_node *np = dev_of_node(&client->dev);
struct device_node *child_node;
struct led_init_data init_data = {};
struct gpio_desc *enable_gpio;
led = devm_kzalloc(&client->dev, sizeof(*led), GFP_KERNEL);
if (!led)
return -ENOMEM;
child_node = of_get_next_available_child(np, NULL);
if (!child_node)
return -EINVAL;
enable_gpio = devm_gpiod_get_optional(&client->dev, "enable", GPIOD_OUT_LOW);
if (IS_ERR(enable_gpio))
return dev_err_probe(&client->dev, PTR_ERR(enable_gpio),
"Failed to get enable GPIO\n");
devm_add_action_or_reset(&client->dev, lp8860_disable_gpio, enable_gpio);
ret = devm_regulator_get_enable_optional(&client->dev, "vled");
if (ret && ret != -ENODEV)
return dev_err_probe(&client->dev, ret,
"Failed to enable vled regulator\n");
led->client = client;
led->led_dev.brightness_set_blocking = lp8860_brightness_set;
ret = devm_mutex_init(&client->dev, &led->lock);
if (ret)
return dev_err_probe(&client->dev, ret, "Failed to initialize lock\n");
led->regmap = devm_regmap_init_i2c(client, &lp8860_regmap_config);
if (IS_ERR(led->regmap)) {
ret = PTR_ERR(led->regmap);
dev_err(&client->dev, "Failed to allocate register map: %d\n",
ret);
return ret;
}
led->eeprom_regmap = devm_regmap_init_i2c(client, &lp8860_eeprom_regmap_config);
if (IS_ERR(led->eeprom_regmap)) {
ret = PTR_ERR(led->eeprom_regmap);
dev_err(&client->dev, "Failed to allocate register map: %d\n",
ret);
return ret;
}
ret = lp8860_init(led);
if (ret)
return ret;
init_data.fwnode = of_fwnode_handle(child_node);
init_data.devicename = LP8860_NAME;
init_data.default_label = ":display_cluster";
ret = devm_led_classdev_register_ext(&client->dev, &led->led_dev,
&init_data);
if (ret) {
dev_err(&client->dev, "led register err: %d\n", ret);
return ret;
}
return 0;
}
static const struct i2c_device_id lp8860_id[] = {
{ "lp8860" },
{ }
};
MODULE_DEVICE_TABLE(i2c, lp8860_id);
static const struct of_device_id of_lp8860_leds_match[] = {
{ .compatible = "ti,lp8860", },
{},
};
MODULE_DEVICE_TABLE(of, of_lp8860_leds_match);
static struct i2c_driver lp8860_driver = {
.driver = {
.name = "lp8860",
.of_match_table = of_lp8860_leds_match,
},
.probe = lp8860_probe,
.id_table = lp8860_id,
};
module_i2c_driver(lp8860_driver);
MODULE_DESCRIPTION("Texas Instruments LP8860 LED driver");
MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");
MODULE_LICENSE("GPL v2");
