Merge tag 'mfd-hwmon-leds-watchdog-v3.18' into hwmon-next

Immutable branch between MFD, HWMON, LEDs and Watchdog for v3.18

3 files changed, 141 insertions, 0 deletions

diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index 8c96e2ddf43b..eadd56c91551 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -468,6 +468,15 @@ 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.
+
+          This driver can also be built as a module. If so the module
+          will be called leds-menf21bmc.
+
 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 d8cc5f2777de..9a72fddc1d78 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -54,6 +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 000000000000..89dd57769e3b
--- /dev/null
+++ b/drivers/leds/leds-menf21bmc.c
@@ -0,0 +1,131 @@
+/*
+ *  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
+ *
+ *  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/i2c.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 {
+        struct led_classdev cdev;
+        u8 led_bit;
+        const char *name;
+        struct i2c_client *i2c_client;
+};
+
+static struct menf21bmc_led 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 *led = container_of(led_cdev,
+                                        struct menf21bmc_led, cdev);
+
+        mutex_lock(&led_lock);
+        led_val = i2c_smbus_read_byte_data(led->i2c_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;
+
+        i2c_smbus_write_byte_data(led->i2c_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 i2c_client *i2c_client = to_i2c_client(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].i2c_client = i2c_client;
+                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 device\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@men.de>");
+MODULE_DESCRIPTION("MEN 14F021P00 BMC led driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:menf21bmc_led");