mediatek: add Ubiquiti LED driver
Add a driver for controlling the RGB LED via Ubiquitis own "LEDBAR" LED controller based on the Holtek HT32F52241 MCU. This driver is initially used by the Ubiquiti UniFi 6 LR, however judging from FCC pictures the MCU is also found on the U6-Mesh as well as the U6-Extender. Signed-off-by: David Bauer <mail@david-bauer.net>
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David Bauer
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f323dec4f8
commit
c9137e2ddf
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// SPDX-License-Identifier: GPL-2.0-only
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#include <linux/delay.h>
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#include <linux/i2c.h>
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#include <linux/init.h>
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#include <linux/leds.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/of.h>
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#include <linux/of_gpio.h>
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#include <linux/gpio/consumer.h>
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/**
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* Driver for the Ubiquiti RGB LED controller (LEDBAR).
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* This Controller is based on a Holtek HT32F52241 and connected
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* via I2C.
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*
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* - The Controller needs an enable signal set to high when
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* performing a transaction. On the U6-LR, this is located
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* at Pin 18 (R6902)
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*
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* - The Pin is also printed when calling the "usetled" function
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* contained in the ubntapp bootloader application.
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*/
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#define UBNT_LEDBAR_MAX_BRIGHTNESS 0xff
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#define UBNT_LEDBAR_TRANSACTION_LENGTH 8
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#define UBNT_LEDBAR_TRANSACTION_SUCCESS 0xaa
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#define UBNT_LEDBAR_TRANSACTION_BLUE_IDX 2
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#define UBNT_LEDBAR_TRANSACTION_GREEN_IDX 3
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#define UBNT_LEDBAR_TRANSACTION_RED_IDX 4
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struct ubnt_ledbar {
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struct mutex lock;
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struct i2c_client *client;
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struct led_classdev led_red;
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struct led_classdev led_green;
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struct led_classdev led_blue;
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struct gpio_desc *enable_gpio;
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};
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static int ubnt_ledbar_perform_transaction(struct ubnt_ledbar *ledbar,
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char *transaction)
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{
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int ret;
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int i;
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for (i = 0; i < UBNT_LEDBAR_TRANSACTION_LENGTH; i++)
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i2c_smbus_write_byte(ledbar->client, transaction[i]);
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return i2c_smbus_read_byte(ledbar->client);
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}
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static int ubnt_ledbar_apply_state(struct ubnt_ledbar *ledbar)
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{
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char setup_msg[UBNT_LEDBAR_TRANSACTION_LENGTH] = {0x40, 0x10, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x11};
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char led_msg[UBNT_LEDBAR_TRANSACTION_LENGTH] = {0x40, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x01, 0x00};
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char i2c_response;
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int ret = 0;
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mutex_lock(&ledbar->lock);
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led_msg[UBNT_LEDBAR_TRANSACTION_BLUE_IDX] = ledbar->led_blue.brightness;
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led_msg[UBNT_LEDBAR_TRANSACTION_GREEN_IDX] = ledbar->led_green.brightness;
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led_msg[UBNT_LEDBAR_TRANSACTION_RED_IDX] = ledbar->led_red.brightness;
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gpiod_set_raw_value(ledbar->enable_gpio, 1);
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msleep(10);
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i2c_response = ubnt_ledbar_perform_transaction(ledbar, setup_msg);
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if (i2c_response != UBNT_LEDBAR_TRANSACTION_SUCCESS) {
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dev_err(&ledbar->client->dev, "Error initializing LED transaction: %02x\n", ret);
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ret = -EINVAL;
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goto out_gpio;
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}
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i2c_response = ubnt_ledbar_perform_transaction(ledbar, led_msg);
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if (i2c_response != UBNT_LEDBAR_TRANSACTION_SUCCESS) {
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dev_err(&ledbar->client->dev, "Failed LED transaction: %02x\n", ret);
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ret = -EINVAL;
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goto out_gpio;
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}
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msleep(10);
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out_gpio:
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gpiod_set_raw_value(ledbar->enable_gpio, 0);
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mutex_unlock(&ledbar->lock);
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return ret;
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}
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#define UBNT_LEDBAR_CONTROL_RGBS(name) \
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static int ubnt_ledbar_set_##name##_brightness(struct led_classdev *led_cdev,\
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enum led_brightness value) \
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{ \
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struct ubnt_ledbar *ledbar = \
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container_of(led_cdev, struct ubnt_ledbar, led_##name); \
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int ret; \
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led_cdev->brightness = value; \
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ret = ubnt_ledbar_apply_state(ledbar); \
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return ret; \
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}
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UBNT_LEDBAR_CONTROL_RGBS(red);
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UBNT_LEDBAR_CONTROL_RGBS(green);
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UBNT_LEDBAR_CONTROL_RGBS(blue);
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static int ubnt_ledbar_init_led(struct device_node *np, struct ubnt_ledbar *ledbar,
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struct led_classdev *led_cdev)
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{
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struct led_init_data init_data = {};
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int ret;
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if (!np)
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return 0;
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init_data.fwnode = of_fwnode_handle(np);
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led_cdev->max_brightness = UBNT_LEDBAR_MAX_BRIGHTNESS;
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ret = devm_led_classdev_register_ext(&ledbar->client->dev, led_cdev,
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&init_data);
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if (ret)
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dev_err(&ledbar->client->dev, "led register err: %d\n", ret);
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return ret;
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}
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static int ubnt_ledbar_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct device_node *np = client->dev.of_node;
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struct ubnt_ledbar *ledbar;
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int ret;
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ledbar = devm_kzalloc(&client->dev, sizeof(*ledbar), GFP_KERNEL);
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if (!ledbar)
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return -ENOMEM;
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ledbar->enable_gpio = devm_gpiod_get(&client->dev, "enable", GPIOD_OUT_LOW);
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if (IS_ERR(ledbar->enable_gpio)) {
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ret = PTR_ERR(ledbar->enable_gpio);
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dev_err(&client->dev, "Failed to get enable gpio: %d\n", ret);
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return ret;
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}
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gpiod_direction_output(ledbar->enable_gpio, 0);
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ledbar->client = client;
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mutex_init(&ledbar->lock);
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i2c_set_clientdata(client, ledbar);
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ledbar->led_red.brightness_set_blocking = ubnt_ledbar_set_red_brightness;
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ubnt_ledbar_init_led(of_get_child_by_name(np, "red"), ledbar, &ledbar->led_red);
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ledbar->led_green.brightness_set_blocking = ubnt_ledbar_set_green_brightness;
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ubnt_ledbar_init_led(of_get_child_by_name(np, "green"), ledbar, &ledbar->led_green);
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ledbar->led_blue.brightness_set_blocking = ubnt_ledbar_set_blue_brightness;
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ubnt_ledbar_init_led(of_get_child_by_name(np, "blue"), ledbar, &ledbar->led_blue);
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return ubnt_ledbar_apply_state(ledbar);
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}
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static int ubnt_ledbar_remove(struct i2c_client *client)
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{
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struct ubnt_ledbar *ledbar = i2c_get_clientdata(client);
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mutex_destroy(&ledbar->lock);
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return 0;
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}
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static const struct i2c_device_id ubnt_ledbar_id[] = {
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{ "ubnt-ledbar", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, ubnt_ledbar_id);
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static const struct of_device_id of_ubnt_ledbar_match[] = {
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{ .compatible = "ubnt,ledbar", },
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{},
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};
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MODULE_DEVICE_TABLE(of, of_ubnt_ledbar_match);
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static struct i2c_driver ubnt_ledbar_driver = {
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.driver = {
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.name = "ubnt-ledbar",
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.of_match_table = of_ubnt_ledbar_match,
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},
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.probe = ubnt_ledbar_probe,
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.remove = ubnt_ledbar_remove,
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.id_table = ubnt_ledbar_id,
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};
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module_i2c_driver(ubnt_ledbar_driver);
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MODULE_DESCRIPTION("Ubiquiti LEDBAR driver");
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MODULE_AUTHOR("David Bauer <mail@david-bauer.net>");
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MODULE_LICENSE("GPL v2");
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@ -367,6 +367,7 @@ CONFIG_IRQ_FORCED_THREADING=y
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CONFIG_IRQ_TIME_ACCOUNTING=y
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CONFIG_IRQ_WORK=y
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CONFIG_JUMP_LABEL=y
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CONFIG_LEDS_UBNT_LEDBAR=y
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CONFIG_LIBFDT=y
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CONFIG_LOCK_DEBUGGING_SUPPORT=y
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CONFIG_LOCK_SPIN_ON_OWNER=y
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@ -295,6 +295,7 @@ CONFIG_JBD2=y
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CONFIG_KALLSYMS=y
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# CONFIG_KEYBOARD_MTK_PMIC is not set
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CONFIG_LEDS_MT6323=y
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# CONFIG_LEDS_UBNT_LEDBAR is not set
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CONFIG_LIBFDT=y
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CONFIG_LOCK_DEBUGGING_SUPPORT=y
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CONFIG_LOCK_SPIN_ON_OWNER=y
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@ -214,6 +214,7 @@ CONFIG_IRQ_FORCED_THREADING=y
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CONFIG_IRQ_TIME_ACCOUNTING=y
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CONFIG_IRQ_WORK=y
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# CONFIG_LEDS_BRIGHTNESS_HW_CHANGED is not set
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# CONFIG_LEDS_UBNT_LEDBAR is not set
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CONFIG_LIBFDT=y
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CONFIG_LOCK_DEBUGGING_SUPPORT=y
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CONFIG_LOCK_SPIN_ON_OWNER=y
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@ -0,0 +1,29 @@
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--- a/drivers/leds/Kconfig
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+++ b/drivers/leds/Kconfig
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@@ -823,6 +823,16 @@ config LEDS_LM36274
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Say Y to enable the LM36274 LED driver for TI LMU devices.
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This supports the LED device LM36274.
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+config LEDS_UBNT_LEDBAR
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+ tristate "LED support for Ubiquiti UniFi 6 LR"
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+ depends on LEDS_CLASS && I2C && OF
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+ help
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+ This option enables support for the Ubiquiti LEDBAR
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+ LED driver.
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+
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+ To compile this driver as a module, choose M here: the module
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+ will be called leds-ubnt-ledbar.
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+
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comment "LED Triggers"
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source "drivers/leds/trigger/Kconfig"
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--- a/drivers/leds/Makefile
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+++ b/drivers/leds/Makefile
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@@ -85,6 +85,7 @@ obj-$(CONFIG_LEDS_LM3601X) += leds-lm36
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obj-$(CONFIG_LEDS_TI_LMU_COMMON) += leds-ti-lmu-common.o
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obj-$(CONFIG_LEDS_LM3697) += leds-lm3697.o
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obj-$(CONFIG_LEDS_LM36274) += leds-lm36274.o
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+obj-$(CONFIG_LEDS_UBNT_LEDBAR) += leds-ubnt-ledbar.o
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# LED SPI Drivers
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obj-$(CONFIG_LEDS_CR0014114) += leds-cr0014114.o
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