From 089381b27abe28a54b1e73e1ab975c2d5b24f8f3 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Marek=20Beh=C3=BAn?= Date: Thu, 23 Jul 2020 14:53:19 +0200 Subject: [PATCH] leds: initial support for Turris Omnia LEDs MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This adds basic support for LEDs on the front side of CZ.NIC's Turris Omnia router. There are 12 RGB LEDs. The controller supports HW triggering mode for the LEDs, but this driver does not support it yet, and sets all the LEDs defined in device-tree into SW mode upon probe. This driver uses the multicolor LED framework. Signed-off-by: Marek Behún Reviewed-by: Dan Murphy Signed-off-by: Pavel Machek --- drivers/leds/Kconfig | 11 ++ drivers/leds/Makefile | 1 + drivers/leds/leds-turris-omnia.c | 295 +++++++++++++++++++++++++++++++ 3 files changed, 307 insertions(+) create mode 100644 drivers/leds/leds-turris-omnia.c diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index b9002850b5fa..d7e4be1b7736 100644 --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -176,6 +176,17 @@ config LEDS_EL15203000 To compile this driver as a module, choose M here: the module will be called leds-el15203000. +config LEDS_TURRIS_OMNIA + tristate "LED support for CZ.NIC's Turris Omnia" + depends on LEDS_CLASS_MULTICOLOR + depends on I2C + depends on MACH_ARMADA_38X || COMPILE_TEST + depends on OF + help + This option enables basic support for the LEDs found on the front + side of CZ.NIC's Turris Omnia router. There are 12 RGB LEDs on the + front panel. + config LEDS_LM3530 tristate "LCD Backlight driver for LM3530" depends on LEDS_CLASS diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile index d684bc76d2b2..c2c7d7ade0d0 100644 --- a/drivers/leds/Makefile +++ b/drivers/leds/Makefile @@ -87,6 +87,7 @@ obj-$(CONFIG_LEDS_TCA6507) += leds-tca6507.o obj-$(CONFIG_LEDS_TI_LMU_COMMON) += leds-ti-lmu-common.o obj-$(CONFIG_LEDS_TLC591XX) += leds-tlc591xx.o obj-$(CONFIG_LEDS_TPS6105X) += leds-tps6105x.o +obj-$(CONFIG_LEDS_TURRIS_OMNIA) += leds-turris-omnia.o obj-$(CONFIG_LEDS_WM831X_STATUS) += leds-wm831x-status.o obj-$(CONFIG_LEDS_WM8350) += leds-wm8350.o obj-$(CONFIG_LEDS_WRAP) += leds-wrap.o diff --git a/drivers/leds/leds-turris-omnia.c b/drivers/leds/leds-turris-omnia.c new file mode 100644 index 000000000000..bb23d8e16614 --- /dev/null +++ b/drivers/leds/leds-turris-omnia.c @@ -0,0 +1,295 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * CZ.NIC's Turris Omnia LEDs driver + * + * 2020 by Marek Behun + */ + +#include +#include +#include +#include +#include +#include "leds.h" + +#define OMNIA_BOARD_LEDS 12 +#define OMNIA_LED_NUM_CHANNELS 3 + +#define CMD_LED_MODE 3 +#define CMD_LED_MODE_LED(l) ((l) & 0x0f) +#define CMD_LED_MODE_USER 0x10 + +#define CMD_LED_STATE 4 +#define CMD_LED_STATE_LED(l) ((l) & 0x0f) +#define CMD_LED_STATE_ON 0x10 + +#define CMD_LED_COLOR 5 +#define CMD_LED_SET_BRIGHTNESS 7 +#define CMD_LED_GET_BRIGHTNESS 8 + +#define OMNIA_CMD 0 + +#define OMNIA_CMD_LED_COLOR_LED 1 +#define OMNIA_CMD_LED_COLOR_R 2 +#define OMNIA_CMD_LED_COLOR_G 3 +#define OMNIA_CMD_LED_COLOR_B 4 +#define OMNIA_CMD_LED_COLOR_LEN 5 + +struct omnia_led { + struct led_classdev_mc mc_cdev; + struct mc_subled subled_info[OMNIA_LED_NUM_CHANNELS]; + int reg; +}; + +#define to_omnia_led(l) container_of(l, struct omnia_led, mc_cdev) + +struct omnia_leds { + struct i2c_client *client; + struct mutex lock; + struct omnia_led leds[]; +}; + +static int omnia_led_brightness_set_blocking(struct led_classdev *cdev, + enum led_brightness brightness) +{ + struct led_classdev_mc *mc_cdev = lcdev_to_mccdev(cdev); + struct omnia_leds *leds = dev_get_drvdata(cdev->dev->parent); + struct omnia_led *led = to_omnia_led(mc_cdev); + u8 buf[OMNIA_CMD_LED_COLOR_LEN], state; + int ret; + + mutex_lock(&leds->lock); + + led_mc_calc_color_components(&led->mc_cdev, brightness); + + buf[OMNIA_CMD] = CMD_LED_COLOR; + buf[OMNIA_CMD_LED_COLOR_LED] = led->reg; + buf[OMNIA_CMD_LED_COLOR_R] = mc_cdev->subled_info[0].brightness; + buf[OMNIA_CMD_LED_COLOR_G] = mc_cdev->subled_info[1].brightness; + buf[OMNIA_CMD_LED_COLOR_B] = mc_cdev->subled_info[2].brightness; + + state = CMD_LED_STATE_LED(led->reg); + if (buf[OMNIA_CMD_LED_COLOR_R] || buf[OMNIA_CMD_LED_COLOR_G] || buf[OMNIA_CMD_LED_COLOR_B]) + state |= CMD_LED_STATE_ON; + + ret = i2c_smbus_write_byte_data(leds->client, CMD_LED_STATE, state); + if (ret >= 0 && (state & CMD_LED_STATE_ON)) + ret = i2c_master_send(leds->client, buf, 5); + + mutex_unlock(&leds->lock); + + return ret; +} + +static int omnia_led_register(struct i2c_client *client, struct omnia_led *led, + struct device_node *np) +{ + struct led_init_data init_data = {}; + struct device *dev = &client->dev; + struct led_classdev *cdev; + int ret, color; + + ret = of_property_read_u32(np, "reg", &led->reg); + if (ret || led->reg >= OMNIA_BOARD_LEDS) { + dev_warn(dev, + "Node %pOF: must contain 'reg' property with values between 0 and %i\n", + np, OMNIA_BOARD_LEDS - 1); + return 0; + } + + ret = of_property_read_u32(np, "color", &color); + if (ret || color != LED_COLOR_ID_MULTI) { + dev_warn(dev, + "Node %pOF: must contain 'color' property with value LED_COLOR_ID_MULTI\n", + np); + return 0; + } + + led->subled_info[0].color_index = LED_COLOR_ID_RED; + led->subled_info[0].channel = 0; + led->subled_info[1].color_index = LED_COLOR_ID_GREEN; + led->subled_info[1].channel = 1; + led->subled_info[2].color_index = LED_COLOR_ID_BLUE; + led->subled_info[2].channel = 2; + + led->mc_cdev.subled_info = led->subled_info; + led->mc_cdev.num_colors = OMNIA_LED_NUM_CHANNELS; + + init_data.fwnode = &np->fwnode; + + cdev = &led->mc_cdev.led_cdev; + cdev->max_brightness = 255; + cdev->brightness_set_blocking = omnia_led_brightness_set_blocking; + + of_property_read_string(np, "linux,default-trigger", &cdev->default_trigger); + + /* put the LED into software mode */ + ret = i2c_smbus_write_byte_data(client, CMD_LED_MODE, + CMD_LED_MODE_LED(led->reg) | + CMD_LED_MODE_USER); + if (ret < 0) { + dev_err(dev, "Cannot set LED %pOF to software mode: %i\n", np, ret); + return ret; + } + + /* disable the LED */ + ret = i2c_smbus_write_byte_data(client, CMD_LED_STATE, CMD_LED_STATE_LED(led->reg)); + if (ret < 0) { + dev_err(dev, "Cannot set LED %pOF brightness: %i\n", np, ret); + return ret; + } + + ret = devm_led_classdev_multicolor_register_ext(dev, &led->mc_cdev, &init_data); + if (ret < 0) { + dev_err(dev, "Cannot register LED %pOF: %i\n", np, ret); + return ret; + } + + return 1; +} + +/* + * On the front panel of the Turris Omnia router there is also a button which + * can be used to control the intensity of all the LEDs at once, so that if they + * are too bright, user can dim them. + * The microcontroller cycles between 8 levels of this global brightness (from + * 100% to 0%), but this setting can have any integer value between 0 and 100. + * It is therefore convenient to be able to change this setting from software. + * We expose this setting via a sysfs attribute file called "brightness". This + * file lives in the device directory of the LED controller, not an individual + * LED, so it should not confuse users. + */ +static ssize_t brightness_show(struct device *dev, struct device_attribute *a, char *buf) +{ + struct i2c_client *client = to_i2c_client(dev); + struct omnia_leds *leds = i2c_get_clientdata(client); + int ret; + + mutex_lock(&leds->lock); + ret = i2c_smbus_read_byte_data(client, CMD_LED_GET_BRIGHTNESS); + mutex_unlock(&leds->lock); + + if (ret < 0) + return ret; + + return sprintf(buf, "%d\n", ret); +} + +static ssize_t brightness_store(struct device *dev, struct device_attribute *a, const char *buf, + size_t count) +{ + struct i2c_client *client = to_i2c_client(dev); + struct omnia_leds *leds = i2c_get_clientdata(client); + unsigned int brightness; + int ret; + + if (sscanf(buf, "%u", &brightness) != 1) + return -EINVAL; + + if (brightness > 100) + return -EINVAL; + + mutex_lock(&leds->lock); + ret = i2c_smbus_write_byte_data(client, CMD_LED_SET_BRIGHTNESS, (u8) brightness); + mutex_unlock(&leds->lock); + + if (ret < 0) + return ret; + + return count; +} +static DEVICE_ATTR_RW(brightness); + +static struct attribute *omnia_led_controller_attrs[] = { + &dev_attr_brightness.attr, + NULL, +}; +ATTRIBUTE_GROUPS(omnia_led_controller); + +static int omnia_leds_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct device *dev = &client->dev; + struct device_node *np = dev->of_node, *child; + struct omnia_leds *leds; + struct omnia_led *led; + int ret, count; + + count = of_get_available_child_count(np); + if (!count) { + dev_err(dev, "LEDs are not defined in device tree!\n"); + return -ENODEV; + } else if (count > OMNIA_BOARD_LEDS) { + dev_err(dev, "Too many LEDs defined in device tree!\n"); + return -EINVAL; + } + + leds = devm_kzalloc(dev, struct_size(leds, leds, count), GFP_KERNEL); + if (!leds) + return -ENOMEM; + + leds->client = client; + i2c_set_clientdata(client, leds); + + mutex_init(&leds->lock); + + led = &leds->leds[0]; + for_each_available_child_of_node(np, child) { + ret = omnia_led_register(client, led, child); + if (ret < 0) + return ret; + + led += ret; + } + + if (devm_device_add_groups(dev, omnia_led_controller_groups)) + dev_warn(dev, "Could not add attribute group!\n"); + + return 0; +} + +static int omnia_leds_remove(struct i2c_client *client) +{ + u8 buf[OMNIA_CMD_LED_COLOR_LEN]; + + /* put all LEDs into default (HW triggered) mode */ + i2c_smbus_write_byte_data(client, CMD_LED_MODE, + CMD_LED_MODE_LED(OMNIA_BOARD_LEDS)); + + /* set all LEDs color to [255, 255, 255] */ + buf[OMNIA_CMD] = CMD_LED_COLOR; + buf[OMNIA_CMD_LED_COLOR_LED] = OMNIA_BOARD_LEDS; + buf[OMNIA_CMD_LED_COLOR_R] = 255; + buf[OMNIA_CMD_LED_COLOR_G] = 255; + buf[OMNIA_CMD_LED_COLOR_B] = 255; + + i2c_master_send(client, buf, 5); + + return 0; +} + +static const struct of_device_id of_omnia_leds_match[] = { + { .compatible = "cznic,turris-omnia-leds", }, + {}, +}; + +static const struct i2c_device_id omnia_id[] = { + { "omnia", 0 }, + { } +}; + +static struct i2c_driver omnia_leds_driver = { + .probe = omnia_leds_probe, + .remove = omnia_leds_remove, + .id_table = omnia_id, + .driver = { + .name = "leds-turris-omnia", + .of_match_table = of_omnia_leds_match, + }, +}; + +module_i2c_driver(omnia_leds_driver); + +MODULE_AUTHOR("Marek Behun "); +MODULE_DESCRIPTION("CZ.NIC's Turris Omnia LEDs"); +MODULE_LICENSE("GPL v2");