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Subject[PATCH v3 2/3] leds: upboard: Add LED support
Date
Allow userspace to use the on-board LEDs as "upboard:<color>:".

Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Dan O'Donovan <dan@emutex.com>
---
drivers/leds/Kconfig | 10 +++++
drivers/leds/Makefile | 1 +
drivers/leds/leds-upboard.c | 103 ++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 114 insertions(+)
create mode 100644 drivers/leds/leds-upboard.c

diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index a72f97f..4ae1ec3 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -766,6 +766,16 @@ config LEDS_NIC78BX
To compile this driver as a module, choose M here: the module
will be called leds-nic78bx.

+config LEDS_UPBOARD
+ tristate "LED support for the UP Squared"
+ depends on LEDS_CLASS
+ depends on MFD_UPBOARD
+ help
+ This option enables support for the LEDs on the UP Squared board.
+
+ This driver can also be built as a module. If so, the module
+ will be called leds-upboard.
+
comment "LED Triggers"
source "drivers/leds/trigger/Kconfig"

diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index 4c1b005..a35629d 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -79,6 +79,7 @@ obj-$(CONFIG_LEDS_MT6323) += leds-mt6323.o
obj-$(CONFIG_LEDS_LM3692X) += leds-lm3692x.o
obj-$(CONFIG_LEDS_SC27XX_BLTC) += leds-sc27xx-bltc.o
obj-$(CONFIG_LEDS_LM3601X) += leds-lm3601x.o
+obj-$(CONFIG_LEDS_UPBOARD) += leds-upboard.o

# LED SPI Drivers
obj-$(CONFIG_LEDS_CR0014114) += leds-cr0014114.o
diff --git a/drivers/leds/leds-upboard.c b/drivers/leds/leds-upboard.c
new file mode 100644
index 0000000..90ebd9b
--- /dev/null
+++ b/drivers/leds/leds-upboard.c
@@ -0,0 +1,103 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// UP Board LED driver
+//
+// Copyright (c) 2018, Emutex Ltd.
+//
+// Author: Javier Arteaga <javier@emutex.com>
+//
+
+#include <linux/kernel.h>
+#include <linux/leds.h>
+#include <linux/mfd/upboard.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#define to_upboard_led(cdev) container_of(cdev, struct upboard_led, cdev)
+
+static const char * const upboard_led_names[] = {
+ "upboard:blue:",
+ "upboard:yellow:",
+ "upboard:green:",
+ "upboard:red:",
+};
+
+struct upboard_led {
+ struct regmap_field *field;
+ struct led_classdev cdev;
+};
+
+static enum led_brightness upboard_led_brightness_get(struct led_classdev *cdev)
+{
+ struct upboard_led *led = to_upboard_led(cdev);
+ int ret, brightness = 0;
+
+ ret = regmap_field_read(led->field, &brightness);
+ if (ret < 0)
+ dev_err(cdev->dev, "Failed to get led brightness, %d", ret);
+
+ return brightness;
+}
+
+static void upboard_led_brightness_set(struct led_classdev *cdev,
+ enum led_brightness brightness)
+{
+ struct upboard_led *led = to_upboard_led(cdev);
+ int ret;
+
+ ret = regmap_field_write(led->field, brightness);
+ if (ret < 0)
+ dev_err(cdev->dev, "Failed to set led brightness, %d", ret);
+}
+
+static int upboard_led_probe(struct platform_device *pdev)
+{
+ unsigned int led_index = pdev->id;
+ struct device *dev = &pdev->dev;
+ struct upboard_led *led;
+ struct regmap *regmap;
+ struct reg_field conf = {
+ .reg = UPBOARD_REG_FUNC_EN0,
+ .lsb = led_index,
+ .msb = led_index,
+ };
+
+ if (led_index >= ARRAY_SIZE(upboard_led_names))
+ return -EINVAL;
+
+ if (!dev->parent)
+ return -EINVAL;
+
+ regmap = dev_get_regmap(dev->parent, NULL);
+ if (!regmap)
+ return -EINVAL;
+
+ led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL);
+ if (!led)
+ return -ENOMEM;
+
+ led->field = devm_regmap_field_alloc(dev, regmap, conf);
+ if (IS_ERR(led->field))
+ return PTR_ERR(led->field);
+
+ led->cdev.max_brightness = 1;
+ led->cdev.brightness_get = upboard_led_brightness_get;
+ led->cdev.brightness_set = upboard_led_brightness_set;
+ led->cdev.name = upboard_led_names[led_index];
+
+ return devm_led_classdev_register(dev, &led->cdev);
+}
+
+static struct platform_driver upboard_led_driver = {
+ .driver = {
+ .name = "upboard-led",
+ },
+};
+
+module_platform_driver_probe(upboard_led_driver, upboard_led_probe);
+
+MODULE_ALIAS("platform:upboard-led");
+MODULE_AUTHOR("Javier Arteaga <javier@emutex.com>");
+MODULE_DESCRIPTION("UP Board LED driver");
+MODULE_LICENSE("GPL v2");
--
2.7.4

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