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// SPDX-License-Identifier: GPL-2.0-only
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/leds.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/gpio/consumer.h>
/**
* Driver for the Ubiquiti RGB LED controller (LEDBAR).
* This Controller is based on a Holtek HT32F52241 and connected
* via I2C.
*
* - The Controller needs an enable signal set to high when
* performing a transaction. On the U6-LR, this is located
* at Pin 18 (R6902)
*
* - The Pin is also printed when calling the "usetled" function
* contained in the ubntapp bootloader application.
*/
#define UBNT_LEDBAR_MAX_BRIGHTNESS 0xff
#define UBNT_LEDBAR_TRANSACTION_LENGTH 8
#define UBNT_LEDBAR_TRANSACTION_SUCCESS 0xaa
#define UBNT_LEDBAR_TRANSACTION_BLUE_IDX 2
#define UBNT_LEDBAR_TRANSACTION_GREEN_IDX 3
#define UBNT_LEDBAR_TRANSACTION_RED_IDX 4
struct ubnt_ledbar {
struct mutex lock;
struct i2c_client *client;
struct led_classdev led_red;
struct led_classdev led_green;
struct led_classdev led_blue;
struct gpio_desc *enable_gpio;
};
static int ubnt_ledbar_perform_transaction(struct ubnt_ledbar *ledbar,
char *transaction)
{
int ret;
int i;
for (i = 0; i < UBNT_LEDBAR_TRANSACTION_LENGTH; i++)
i2c_smbus_write_byte(ledbar->client, transaction[i]);
return i2c_smbus_read_byte(ledbar->client);
}
static int ubnt_ledbar_apply_state(struct ubnt_ledbar *ledbar)
{
char setup_msg[UBNT_LEDBAR_TRANSACTION_LENGTH] = {0x40, 0x10, 0x00, 0x00,
0x00, 0x00, 0x00, 0x11};
char led_msg[UBNT_LEDBAR_TRANSACTION_LENGTH] = {0x40, 0x00, 0x00, 0x00,
0x00, 0x00, 0x01, 0x00};
char i2c_response;
int ret = 0;
mutex_lock(&ledbar->lock);
led_msg[UBNT_LEDBAR_TRANSACTION_BLUE_IDX] = ledbar->led_blue.brightness;
led_msg[UBNT_LEDBAR_TRANSACTION_GREEN_IDX] = ledbar->led_green.brightness;
led_msg[UBNT_LEDBAR_TRANSACTION_RED_IDX] = ledbar->led_red.brightness;
gpiod_set_raw_value(ledbar->enable_gpio, 1);
msleep(10);
i2c_response = ubnt_ledbar_perform_transaction(ledbar, setup_msg);
if (i2c_response != UBNT_LEDBAR_TRANSACTION_SUCCESS) {
dev_err(&ledbar->client->dev, "Error initializing LED transaction: %02x\n", ret);
ret = -EINVAL;
goto out_gpio;
}
i2c_response = ubnt_ledbar_perform_transaction(ledbar, led_msg);
if (i2c_response != UBNT_LEDBAR_TRANSACTION_SUCCESS) {
dev_err(&ledbar->client->dev, "Failed LED transaction: %02x\n", ret);
ret = -EINVAL;
goto out_gpio;
}
msleep(10);
out_gpio:
gpiod_set_raw_value(ledbar->enable_gpio, 0);
mutex_unlock(&ledbar->lock);
return ret;
}
#define UBNT_LEDBAR_CONTROL_RGBS(name) \
static int ubnt_ledbar_set_##name##_brightness(struct led_classdev *led_cdev,\
enum led_brightness value) \
{ \
struct ubnt_ledbar *ledbar = \
container_of(led_cdev, struct ubnt_ledbar, led_##name); \
int ret; \
led_cdev->brightness = value; \
ret = ubnt_ledbar_apply_state(ledbar); \
return ret; \
}
UBNT_LEDBAR_CONTROL_RGBS(red);
UBNT_LEDBAR_CONTROL_RGBS(green);
UBNT_LEDBAR_CONTROL_RGBS(blue);
static int ubnt_ledbar_init_led(struct device_node *np, struct ubnt_ledbar *ledbar,
struct led_classdev *led_cdev)
{
struct led_init_data init_data = {};
int ret;
if (!np)
return 0;
init_data.fwnode = of_fwnode_handle(np);
led_cdev->max_brightness = UBNT_LEDBAR_MAX_BRIGHTNESS;
ret = devm_led_classdev_register_ext(&ledbar->client->dev, led_cdev,
&init_data);
if (ret)
dev_err(&ledbar->client->dev, "led register err: %d\n", ret);
return ret;
}
static int ubnt_ledbar_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct device_node *np = client->dev.of_node;
struct ubnt_ledbar *ledbar;
int ret;
ledbar = devm_kzalloc(&client->dev, sizeof(*ledbar), GFP_KERNEL);
if (!ledbar)
return -ENOMEM;
ledbar->enable_gpio = devm_gpiod_get(&client->dev, "enable", GPIOD_OUT_LOW);
if (IS_ERR(ledbar->enable_gpio)) {
ret = PTR_ERR(ledbar->enable_gpio);
dev_err(&client->dev, "Failed to get enable gpio: %d\n", ret);
return ret;
}
gpiod_direction_output(ledbar->enable_gpio, 0);
ledbar->client = client;
mutex_init(&ledbar->lock);
i2c_set_clientdata(client, ledbar);
ledbar->led_red.brightness_set_blocking = ubnt_ledbar_set_red_brightness;
ubnt_ledbar_init_led(of_get_child_by_name(np, "red"), ledbar, &ledbar->led_red);
ledbar->led_green.brightness_set_blocking = ubnt_ledbar_set_green_brightness;
ubnt_ledbar_init_led(of_get_child_by_name(np, "green"), ledbar, &ledbar->led_green);
ledbar->led_blue.brightness_set_blocking = ubnt_ledbar_set_blue_brightness;
ubnt_ledbar_init_led(of_get_child_by_name(np, "blue"), ledbar, &ledbar->led_blue);
return ubnt_ledbar_apply_state(ledbar);
}
static int ubnt_ledbar_remove(struct i2c_client *client)
{
struct ubnt_ledbar *ledbar = i2c_get_clientdata(client);
mutex_destroy(&ledbar->lock);
return 0;
}
static const struct i2c_device_id ubnt_ledbar_id[] = {
{ "ubnt-ledbar", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, ubnt_ledbar_id);
static const struct of_device_id of_ubnt_ledbar_match[] = {
{ .compatible = "ubnt,ledbar", },
{},
};
MODULE_DEVICE_TABLE(of, of_ubnt_ledbar_match);
static struct i2c_driver ubnt_ledbar_driver = {
.driver = {
.name = "ubnt-ledbar",
.of_match_table = of_ubnt_ledbar_match,
},
.probe = ubnt_ledbar_probe,
.remove = ubnt_ledbar_remove,
.id_table = ubnt_ledbar_id,
};
module_i2c_driver(ubnt_ledbar_driver);
MODULE_DESCRIPTION("Ubiquiti LEDBAR driver");
MODULE_AUTHOR("David Bauer <mail@david-bauer.net>");
MODULE_LICENSE("GPL v2");
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