The device provides 6 channels which can be individually turned off and on but groups of two channels share a common brightness register. Limitation: The GPIO to enable the device is not used yet. Signed-off-by: Andreas Kemnade <andreas@xxxxxxxxxxxx> Reviewed-by: Matti Vaittinen <mazziesaccount@xxxxxxxxx> Acked-by: Pavel Machek <pavel@xxxxxx> --- drivers/leds/Kconfig | 14 +++ drivers/leds/Makefile | 1 + drivers/leds/leds-bd2606mvv.c | 160 ++++++++++++++++++++++++++++++++++ 3 files changed, 175 insertions(+) create mode 100644 drivers/leds/leds-bd2606mvv.c diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index 9dbce09eabacf..09afc56f54f16 100644 --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -551,6 +551,20 @@ config LEDS_REGULATOR help This option enables support for regulator driven LEDs. +config LEDS_BD2606MVV + tristate "LED driver for BD2606MVV" + depends on LEDS_CLASS + depends on I2C + select REGMAP_I2C + help + This option enables support for BD2606MVV LED driver chips + accessed via the I2C bus. It supports setting brightness, with + the limitiation that there are groups of two channels sharing + a brightness setting, but not the on/off setting. + + To compile this driver as a module, choose M here: the module will + be called leds-bd2606mvv. + config LEDS_BD2802 tristate "LED driver for BD2802 RGB LED" depends on LEDS_CLASS diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile index d30395d11fd84..c07d1512c745a 100644 --- a/drivers/leds/Makefile +++ b/drivers/leds/Makefile @@ -17,6 +17,7 @@ obj-$(CONFIG_LEDS_ARIEL) += leds-ariel.o obj-$(CONFIG_LEDS_AW2013) += leds-aw2013.o obj-$(CONFIG_LEDS_BCM6328) += leds-bcm6328.o obj-$(CONFIG_LEDS_BCM6358) += leds-bcm6358.o +obj-$(CONFIG_LEDS_BD2606MVV) += leds-bd2606mvv.o obj-$(CONFIG_LEDS_BD2802) += leds-bd2802.o obj-$(CONFIG_LEDS_BLINKM) += leds-blinkm.o obj-$(CONFIG_LEDS_CLEVO_MAIL) += leds-clevo-mail.o diff --git a/drivers/leds/leds-bd2606mvv.c b/drivers/leds/leds-bd2606mvv.c new file mode 100644 index 0000000000000..76f9d4d70f9a6 --- /dev/null +++ b/drivers/leds/leds-bd2606mvv.c @@ -0,0 +1,160 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2023 Andreas Kemnade + * + * Datasheet: + * https://fscdn.rohm.com/en/products/databook/datasheet/ic/power/led_driver/bd2606mvv_1-e.pdf + * + * If LED brightness cannot be controlled independently due to shared + * brightness registers, max_brightness is set to 1 and only on/off + * is possible for the affected LED pair. + */ + +#include <linux/i2c.h> +#include <linux/leds.h> +#include <linux/module.h> +#include <linux/mod_devicetable.h> +#include <linux/property.h> +#include <linux/regmap.h> +#include <linux/slab.h> + +#define BD2606_MAX_LEDS 6 +#define BD2606_MAX_BRIGHTNESS 63 +#define BD2606_REG_PWRCNT 3 +#define ldev_to_led(c) container_of(c, struct bd2606mvv_led, ldev) + +struct bd2606mvv_led { + unsigned int led_no; + struct led_classdev ldev; + struct bd2606mvv_priv *priv; +}; + +struct bd2606mvv_priv { + struct bd2606mvv_led leds[BD2606_MAX_LEDS]; + struct regmap *regmap; +}; + +static int +bd2606mvv_brightness_set(struct led_classdev *led_cdev, + enum led_brightness brightness) +{ + struct bd2606mvv_led *led = ldev_to_led(led_cdev); + struct bd2606mvv_priv *priv = led->priv; + int err; + + if (brightness == 0) + return regmap_update_bits(priv->regmap, + BD2606_REG_PWRCNT, + 1 << led->led_no, + 0); + + /* shared brightness register */ + err = regmap_write(priv->regmap, led->led_no / 2, + led_cdev->max_brightness == 1 ? + BD2606_MAX_BRIGHTNESS : brightness); + if (err) + return err; + + return regmap_update_bits(priv->regmap, + BD2606_REG_PWRCNT, + 1 << led->led_no, + 1 << led->led_no); +} + +static const struct regmap_config bd2606mvv_regmap = { + .reg_bits = 8, + .val_bits = 8, + .max_register = 0x3, +}; + +static int bd2606mvv_probe(struct i2c_client *client) +{ + struct fwnode_handle *np, *child; + struct device *dev = &client->dev; + struct bd2606mvv_priv *priv; + struct fwnode_handle *led_fwnodes[BD2606_MAX_LEDS] = { 0 }; + int active_pairs[BD2606_MAX_LEDS / 2] = { 0 }; + int err, reg; + int i; + + np = dev_fwnode(dev); + if (!np) + return -ENODEV; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->regmap = devm_regmap_init_i2c(client, &bd2606mvv_regmap); + if (IS_ERR(priv->regmap)) { + err = PTR_ERR(priv->regmap); + dev_err(dev, "Failed to allocate register map: %d\n", err); + return err; + } + + i2c_set_clientdata(client, priv); + + fwnode_for_each_available_child_node(np, child) { + struct bd2606mvv_led *led; + + err = fwnode_property_read_u32(child, "reg", ®); + if (err) { + fwnode_handle_put(child); + return err; + } + if (reg < 0 || reg >= BD2606_MAX_LEDS || led_fwnodes[reg]) { + fwnode_handle_put(child); + return -EINVAL; + } + led = &priv->leds[reg]; + led_fwnodes[reg] = child; + active_pairs[reg / 2]++; + led->priv = priv; + led->led_no = reg; + led->ldev.brightness_set_blocking = bd2606mvv_brightness_set; + led->ldev.max_brightness = BD2606_MAX_BRIGHTNESS; + } + + for (i = 0; i < BD2606_MAX_LEDS; i++) { + struct led_init_data init_data = {}; + + if (!led_fwnodes[i]) + continue; + + init_data.fwnode = led_fwnodes[i]; + /* Check whether brightness can be independently adjusted. */ + if (active_pairs[i / 2] == 2) + priv->leds[i].ldev.max_brightness = 1; + + err = devm_led_classdev_register_ext(dev, + &priv->leds[i].ldev, + &init_data); + if (err < 0) { + fwnode_handle_put(child); + return dev_err_probe(dev, err, + "couldn't register LED %s\n", + priv->leds[i].ldev.name); + } + } + return 0; +} + +static const struct of_device_id __maybe_unused of_bd2606mvv_leds_match[] = { + { .compatible = "rohm,bd2606mvv", }, + {}, +}; +MODULE_DEVICE_TABLE(of, of_bd2606mvv_leds_match); + +static struct i2c_driver bd2606mvv_driver = { + .driver = { + .name = "leds-bd2606mvv", + .of_match_table = of_match_ptr(of_bd2606mvv_leds_match), + }, + .probe_new = bd2606mvv_probe, +}; + +module_i2c_driver(bd2606mvv_driver); + +MODULE_AUTHOR("Andreas Kemnade <andreas@xxxxxxxxxxxx>"); +MODULE_DESCRIPTION("BD2606 LED driver"); +MODULE_LICENSE("GPL"); -- 2.39.2
