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

Signed-off-by: Javier Arteaga <javier@emutex.com>
---
drivers/leds/Kconfig | 10 +++++
drivers/leds/Makefile | 1 +
drivers/leds/leds-upboard.c | 87 +++++++++++++++++++++++++++++++++++++
drivers/mfd/upboard.c | 19 ++++++++
include/linux/mfd/upboard.h | 5 +++
5 files changed, 122 insertions(+)
create mode 100644 drivers/leds/leds-upboard.c

diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index 2c896c0e69e1..2e77b46f2802 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -722,6 +722,16 @@ 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 91eca81cae82..4008e2061e1f 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -76,6 +76,7 @@ obj-$(CONFIG_LEDS_MLXREG) += leds-mlxreg.o
obj-$(CONFIG_LEDS_NIC78BX) += leds-nic78bx.o
obj-$(CONFIG_LEDS_MT6323) += leds-mt6323.o
obj-$(CONFIG_LEDS_LM3692X) += leds-lm3692x.o
+obj-$(CONFIG_LEDS_UPBOARD) += leds-upboard.o

# LED SPI Drivers
obj-$(CONFIG_LEDS_DAC124S085) += leds-dac124s085.o
diff --git a/drivers/leds/leds-upboard.c b/drivers/leds/leds-upboard.c
new file mode 100644
index 000000000000..e9d7a1fbcde4
--- /dev/null
+++ b/drivers/leds/leds-upboard.c
@@ -0,0 +1,87 @@
+// 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>
+
+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 = container_of(cdev, struct upboard_led, cdev);
+ int brightness = 0;
+
+ regmap_field_read(led->field, &brightness);
+
+ return brightness;
+};
+
+static void upboard_led_brightness_set(struct led_classdev *cdev,
+ enum led_brightness brightness)
+{
+ struct upboard_led *led = container_of(cdev, struct upboard_led, cdev);
+
+ regmap_field_write(led->field, brightness != LED_OFF);
+};
+
+static int __init upboard_led_probe(struct platform_device *pdev)
+{
+ struct upboard_led_data * const pdata = pdev->dev.platform_data;
+ struct upboard *upboard;
+ struct upboard_led *led;
+ struct reg_field conf = {
+ .reg = UPBOARD_REG_FUNC_EN0,
+ };
+
+ if (!pdev->dev.parent)
+ return -EINVAL;
+
+ upboard = dev_get_drvdata(pdev->dev.parent);
+ if (!upboard || !pdata)
+ return -EINVAL;
+
+ led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL);
+ if (!led)
+ return -ENOMEM;
+
+ conf.lsb = pdata->id;
+ conf.msb = pdata->id;
+ led->field = devm_regmap_field_alloc(&pdev->dev, upboard->regmap, conf);
+ if (IS_ERR(led->field))
+ return PTR_ERR(led->field);
+
+ led->cdev.brightness_get = upboard_led_brightness_get;
+ led->cdev.brightness_set = upboard_led_brightness_set;
+ led->cdev.name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "upboard:%s:",
+ pdata->color);
+ if (!led->cdev.name)
+ return -ENOMEM;
+
+ return devm_led_classdev_register(&pdev->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");
diff --git a/drivers/mfd/upboard.c b/drivers/mfd/upboard.c
index 8bae450cb83d..6e4767e4dc41 100644
--- a/drivers/mfd/upboard.c
+++ b/drivers/mfd/upboard.c
@@ -79,6 +79,14 @@ struct upboard_data {
size_t ncells;
};

+#define UPBOARD_LED_CELL(led_data, n) \
+ { \
+ .name = "upboard-led", \
+ .id = (n), \
+ .platform_data = &led_data[(n)], \
+ .pdata_size = sizeof(*(led_data)), \
+ }
+
/* UP Squared */

static const struct regmap_range upboard_up2_readable_ranges[] = {
@@ -116,7 +124,18 @@ static const struct regmap_config upboard_up2_regmap_config = {
.wr_table = &upboard_up2_writable_table,
};

+static struct upboard_led_data upboard_up2_led_data[] = {
+ { .id = 0, .color = "blue" },
+ { .id = 1, .color = "yellow" },
+ { .id = 2, .color = "green" },
+ { .id = 3, .color = "red" },
+};
+
static const struct mfd_cell upboard_up2_mfd_cells[] = {
+ UPBOARD_LED_CELL(upboard_up2_led_data, 0),
+ UPBOARD_LED_CELL(upboard_up2_led_data, 1),
+ UPBOARD_LED_CELL(upboard_up2_led_data, 2),
+ UPBOARD_LED_CELL(upboard_up2_led_data, 3),
};

static const struct upboard_data upboard_up2_data = {
diff --git a/include/linux/mfd/upboard.h b/include/linux/mfd/upboard.h
index d9dd214f4d29..eed68caa23ce 100644
--- a/include/linux/mfd/upboard.h
+++ b/include/linux/mfd/upboard.h
@@ -62,4 +62,9 @@ struct upboard {
struct gpio_desc *dataout_gpio;
};

+struct upboard_led_data {
+ unsigned int id;
+ const char *color;
+};
+
#endif /* __LINUX_MFD_UPBOARD_H */
--
2.17.0
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