[PATCH v2 3/3] drivers/leds/leds-menf21bmc: introduce MEN 14F021P00 BMC LED driver
From: Andreas Werner
Date: Tue May 27 2014 - 04:16:14 EST
Added driver to support the 14F021P00 BMC LEDs.
The BMC is a Board Management Controll include four LEDs which
can be switched on and off.
This driver use the I2C interface to the BMC using the menf21bmc MFD Core driver.
Signed-off-by: Andreas Werner <andreas.werner@xxxxxx>
---
drivers/leds/Kconfig | 6 ++
drivers/leds/Makefile | 2 +-
drivers/leds/leds-menf21bmc.c | 136 ++++++++++++++++++++++++++++++++++++++++++
3 files changed, 143 insertions(+), 1 deletion(-)
create mode 100644 drivers/leds/leds-menf21bmc.c
diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index 1e81d7a..8f98e0f 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -466,6 +466,12 @@ config LEDS_OT200
This option enables support for the LEDs on the Bachmann OT200.
Say Y to enable LEDs on the Bachmann OT200.
+config LEDS_MENF21BMC
+ tristate "LED support for the MEN 14F021P00 BMC"
+ depends on LEDS_CLASS && MFD_MENF21BMC
+ help
+ Say Y here to include support for the MEN 14F021P00 BMC LEDs.
+
comment "LED driver for blink(1) USB RGB LED is under Special HID drivers (HID_THINGM)"
config LEDS_BLINKM
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index 79c5155..1c465fe 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -54,7 +54,7 @@ obj-$(CONFIG_LEDS_MAX8997) += leds-max8997.o
obj-$(CONFIG_LEDS_LM355x) += leds-lm355x.o
obj-$(CONFIG_LEDS_BLINKM) += leds-blinkm.o
obj-$(CONFIG_LEDS_VERSATILE) += leds-versatile.o
-
+obj-$(CONFIG_LEDS_MENF21BMC) += leds-menf21bmc.o
# LED SPI Drivers
obj-$(CONFIG_LEDS_DAC124S085) += leds-dac124s085.o
diff --git a/drivers/leds/leds-menf21bmc.c b/drivers/leds/leds-menf21bmc.c
new file mode 100644
index 0000000..6099524
--- /dev/null
+++ b/drivers/leds/leds-menf21bmc.c
@@ -0,0 +1,136 @@
+/*
+ * MEN 14F021P00 Board Management Controller (BMC) LEDs Driver.
+ *
+ * This is the core LED driver of the MEN 14F021P00 BMC.
+ * There are four LEDs available which can be switched on and off.
+ * STATUS LED, HOT SWAP LED, USER LED 1, USER LED 2
+ *
+ * Copyright (C) 2014 MEN Mikro Elektronik Nuernberg GmbH
+ * Author: Andreas Werner <andreas.werner@xxxxxx>
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/leds.h>
+#include <linux/mfd/menf21bmc.h>
+
+#define BMC_CMD_LED_GET_SET 0xA0
+#define BMC_BIT_LED_STATUS BIT(0)
+#define BMC_BIT_LED_HOTSWAP BIT(1)
+#define BMC_BIT_LED_USER1 BIT(2)
+#define BMC_BIT_LED_USER2 BIT(3)
+
+struct menf21bmc_led_data {
+ struct led_classdev cdev;
+ struct menf21bmc *menf21bmc;
+ u8 led_bit;
+ const char *name;
+};
+
+static struct menf21bmc_led_data leds[] = {
+ {
+ .name = "menf21bmc:led_status",
+ .led_bit = BMC_BIT_LED_STATUS,
+ },
+ {
+ .name = "menf21bmc:led_hotswap",
+ .led_bit = BMC_BIT_LED_HOTSWAP,
+ },
+ {
+ .name = "menf21bmc:led_user1",
+ .led_bit = BMC_BIT_LED_USER1,
+ },
+ {
+ .name = "menf21bmc:led_user2",
+ .led_bit = BMC_BIT_LED_USER2,
+ }
+};
+
+static DEFINE_MUTEX(led_lock);
+
+static void
+menf21bmc_led_set(struct led_classdev *led_cdev, enum led_brightness value)
+{
+ int led_val;
+ struct menf21bmc_led_data *led = container_of(led_cdev,
+ struct menf21bmc_led_data, cdev);
+ struct menf21bmc *menf21bmc = led->menf21bmc;
+
+ mutex_lock(&led_lock);
+ led_val = menf21bmc->read_byte_data(menf21bmc->client,
+ BMC_CMD_LED_GET_SET);
+ if (led_val < 0)
+ goto err_out;
+
+ if (value == LED_OFF)
+ led_val &= ~led->led_bit;
+ else
+ led_val |= led->led_bit;
+
+ menf21bmc->write_byte_data(menf21bmc->client,
+ BMC_CMD_LED_GET_SET, led_val);
+err_out:
+ mutex_unlock(&led_lock);
+}
+
+static int menf21bmc_led_probe(struct platform_device *pdev)
+{
+ int i;
+ int ret;
+ struct menf21bmc *menf21bmc = dev_get_drvdata(pdev->dev.parent);
+
+ for (i = 0; i < ARRAY_SIZE(leds); i++) {
+ leds[i].cdev.name = leds[i].name;
+ leds[i].cdev.brightness_set = menf21bmc_led_set;
+ leds[i].menf21bmc = menf21bmc;
+
+ ret = led_classdev_register(&pdev->dev, &leds[i].cdev);
+ if (ret < 0)
+ goto err_free_leds;
+ }
+ dev_info(&pdev->dev, "MEN 140F21P00 BMC LED device enabled\n");
+
+ return 0;
+
+err_free_leds:
+ dev_err(&pdev->dev, "failed to register LED devicei\n");
+
+ for (i = i - 1; i >= 0; i--)
+ led_classdev_unregister(&leds[i].cdev);
+
+ return ret;
+}
+
+static int menf21bmc_led_remove(struct platform_device *pdev)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(leds); i++)
+ led_classdev_unregister(&leds[i].cdev);
+
+ return 0;
+}
+
+static struct platform_driver menf21bmc_led = {
+ .probe = menf21bmc_led_probe,
+ .remove = menf21bmc_led_remove,
+ .driver = {
+ .name = "menf21bmc_led",
+ .owner = THIS_MODULE,
+ },
+};
+
+module_platform_driver(menf21bmc_led);
+
+MODULE_AUTHOR("Andreas Werner <andreas.werner@xxxxxx>");
+MODULE_DESCRIPTION("MEN 14F021P00 BMC led driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:menf21bmc_led");
--
1.9.3
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