leds-fsg.c

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/*
 * LED Driver for the Freecom FSG-3
 *
 * Copyright (c) 2008 Rod Whitby <[email protected]>
 *
 * Author: Rod Whitby <[email protected]>
 *
 * Based on leds-spitz.c
 * Copyright 2005-2006 Openedhand Ltd.
 * Author: Richard Purdie <[email protected]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/leds.h>
#include <linux/module.h>
#include <mach/hardware.h>
#include <asm/io.h>

#define FSG_LED_WLAN_BIT    0
#define FSG_LED_WAN_BIT     1
#define FSG_LED_SATA_BIT    2
#define FSG_LED_USB_BIT     4
#define FSG_LED_RING_BIT    5
#define FSG_LED_SYNC_BIT    7

static short __iomem *latch_address;
static unsigned short latch_value;


static void fsg_led_wlan_set(struct led_classdev *led_cdev,
                 enum led_brightness value)
{
    if (value) {
        latch_value &= ~(1 << FSG_LED_WLAN_BIT);
        *latch_address = latch_value;
    } else {
        latch_value |=  (1 << FSG_LED_WLAN_BIT);
        *latch_address = latch_value;
    }
}

static void fsg_led_wan_set(struct led_classdev *led_cdev,
                enum led_brightness value)
{
    if (value) {
        latch_value &= ~(1 << FSG_LED_WAN_BIT);
        *latch_address = latch_value;
    } else {
        latch_value |=  (1 << FSG_LED_WAN_BIT);
        *latch_address = latch_value;
    }
}

static void fsg_led_sata_set(struct led_classdev *led_cdev,
                 enum led_brightness value)
{
    if (value) {
        latch_value &= ~(1 << FSG_LED_SATA_BIT);
        *latch_address = latch_value;
    } else {
        latch_value |=  (1 << FSG_LED_SATA_BIT);
        *latch_address = latch_value;
    }
}

static void fsg_led_usb_set(struct led_classdev *led_cdev,
                enum led_brightness value)
{
    if (value) {
        latch_value &= ~(1 << FSG_LED_USB_BIT);
        *latch_address = latch_value;
    } else {
        latch_value |=  (1 << FSG_LED_USB_BIT);
        *latch_address = latch_value;
    }
}

static void fsg_led_sync_set(struct led_classdev *led_cdev,
                 enum led_brightness value)
{
    if (value) {
        latch_value &= ~(1 << FSG_LED_SYNC_BIT);
        *latch_address = latch_value;
    } else {
        latch_value |=  (1 << FSG_LED_SYNC_BIT);
        *latch_address = latch_value;
    }
}

static void fsg_led_ring_set(struct led_classdev *led_cdev,
                 enum led_brightness value)
{
    if (value) {
        latch_value &= ~(1 << FSG_LED_RING_BIT);
        *latch_address = latch_value;
    } else {
        latch_value |=  (1 << FSG_LED_RING_BIT);
        *latch_address = latch_value;
    }
}


static struct led_classdev fsg_wlan_led = {
    .name           = "fsg:blue:wlan",
    .brightness_set     = fsg_led_wlan_set,
    .flags          = LED_CORE_SUSPENDRESUME,
};

static struct led_classdev fsg_wan_led = {
    .name           = "fsg:blue:wan",
    .brightness_set     = fsg_led_wan_set,
    .flags          = LED_CORE_SUSPENDRESUME,
};

static struct led_classdev fsg_sata_led = {
    .name           = "fsg:blue:sata",
    .brightness_set     = fsg_led_sata_set,
    .flags          = LED_CORE_SUSPENDRESUME,
};

static struct led_classdev fsg_usb_led = {
    .name           = "fsg:blue:usb",
    .brightness_set     = fsg_led_usb_set,
    .flags          = LED_CORE_SUSPENDRESUME,
};

static struct led_classdev fsg_sync_led = {
    .name           = "fsg:blue:sync",
    .brightness_set     = fsg_led_sync_set,
    .flags          = LED_CORE_SUSPENDRESUME,
};

static struct led_classdev fsg_ring_led = {
    .name           = "fsg:blue:ring",
    .brightness_set     = fsg_led_ring_set,
    .flags          = LED_CORE_SUSPENDRESUME,
};


static int fsg_led_probe(struct platform_device *pdev)
{
    int ret;

    /* Map the LED chip select address space */
    latch_address = (unsigned short *) ioremap(IXP4XX_EXP_BUS_BASE(2), 512);
    if (!latch_address) {
        ret = -ENOMEM;
        goto failremap;
    }

    latch_value = 0xffff;
    *latch_address = latch_value;

    ret = led_classdev_register(&pdev->dev, &fsg_wlan_led);
    if (ret < 0)
        goto failwlan;

    ret = led_classdev_register(&pdev->dev, &fsg_wan_led);
    if (ret < 0)
        goto failwan;

    ret = led_classdev_register(&pdev->dev, &fsg_sata_led);
    if (ret < 0)
        goto failsata;

    ret = led_classdev_register(&pdev->dev, &fsg_usb_led);
    if (ret < 0)
        goto failusb;

    ret = led_classdev_register(&pdev->dev, &fsg_sync_led);
    if (ret < 0)
        goto failsync;

    ret = led_classdev_register(&pdev->dev, &fsg_ring_led);
    if (ret < 0)
        goto failring;

    return ret;

 failring:
    led_classdev_unregister(&fsg_sync_led);
 failsync:
    led_classdev_unregister(&fsg_usb_led);
 failusb:
    led_classdev_unregister(&fsg_sata_led);
 failsata:
    led_classdev_unregister(&fsg_wan_led);
 failwan:
    led_classdev_unregister(&fsg_wlan_led);
 failwlan:
    iounmap(latch_address);
 failremap:

    return ret;
}

static int fsg_led_remove(struct platform_device *pdev)
{
    led_classdev_unregister(&fsg_wlan_led);
    led_classdev_unregister(&fsg_wan_led);
    led_classdev_unregister(&fsg_sata_led);
    led_classdev_unregister(&fsg_usb_led);
    led_classdev_unregister(&fsg_sync_led);
    led_classdev_unregister(&fsg_ring_led);

    iounmap(latch_address);

    return 0;
}


static struct platform_driver fsg_led_driver = {
    .probe      = fsg_led_probe,
    .remove     = fsg_led_remove,
    .driver     = {
        .name       = "fsg-led",
    },
};

module_platform_driver(fsg_led_driver);

MODULE_AUTHOR("Rod Whitby <[email protected]>");
MODULE_DESCRIPTION("Freecom FSG-3 LED driver");
MODULE_LICENSE("GPL");