leds-sunfire.c

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/* leds-sunfire.c: SUNW,Ultra-Enterprise LED driver.
 *
 * Copyright (C) 2008 David S. Miller <[email protected]>
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/leds.h>
#include <linux/io.h>
#include <linux/platform_device.h>
#include <linux/slab.h>

#include <asm/fhc.h>
#include <asm/upa.h>

#define DRIVER_NAME "leds-sunfire"
#define PFX     DRIVER_NAME ": "

MODULE_AUTHOR("David S. Miller ([email protected])");
MODULE_DESCRIPTION("Sun Fire LED driver");
MODULE_LICENSE("GPL");

struct sunfire_led {
    struct led_classdev led_cdev;
    void __iomem        *reg;
};
#define to_sunfire_led(d) container_of(d, struct sunfire_led, led_cdev)

static void __clockboard_set(struct led_classdev *led_cdev,
                 enum led_brightness led_val, u8 bit)
{
    struct sunfire_led *p = to_sunfire_led(led_cdev);
    u8 reg = upa_readb(p->reg);

    switch (bit) {
    case CLOCK_CTRL_LLED:
        if (led_val)
            reg &= ~bit;
        else
            reg |= bit;
        break;

    default:
        if (led_val)
            reg |= bit;
        else
            reg &= ~bit;
        break;
    }
    upa_writeb(reg, p->reg);
}

static void clockboard_left_set(struct led_classdev *led_cdev,
                enum led_brightness led_val)
{
    __clockboard_set(led_cdev, led_val, CLOCK_CTRL_LLED);
}

static void clockboard_middle_set(struct led_classdev *led_cdev,
                  enum led_brightness led_val)
{
    __clockboard_set(led_cdev, led_val, CLOCK_CTRL_MLED);
}

static void clockboard_right_set(struct led_classdev *led_cdev,
                 enum led_brightness led_val)
{
    __clockboard_set(led_cdev, led_val, CLOCK_CTRL_RLED);
}

static void __fhc_set(struct led_classdev *led_cdev,
                 enum led_brightness led_val, u32 bit)
{
    struct sunfire_led *p = to_sunfire_led(led_cdev);
    u32 reg = upa_readl(p->reg);

    switch (bit) {
    case FHC_CONTROL_LLED:
        if (led_val)
            reg &= ~bit;
        else
            reg |= bit;
        break;

    default:
        if (led_val)
            reg |= bit;
        else
            reg &= ~bit;
        break;
    }
    upa_writel(reg, p->reg);
}

static void fhc_left_set(struct led_classdev *led_cdev,
             enum led_brightness led_val)
{
    __fhc_set(led_cdev, led_val, FHC_CONTROL_LLED);
}

static void fhc_middle_set(struct led_classdev *led_cdev,
               enum led_brightness led_val)
{
    __fhc_set(led_cdev, led_val, FHC_CONTROL_MLED);
}

static void fhc_right_set(struct led_classdev *led_cdev,
              enum led_brightness led_val)
{
    __fhc_set(led_cdev, led_val, FHC_CONTROL_RLED);
}

typedef void (*set_handler)(struct led_classdev *, enum led_brightness);
struct led_type {
    const char  *name;
    set_handler handler;
    const char  *default_trigger;
};

#define NUM_LEDS_PER_BOARD  3
struct sunfire_drvdata {
    struct sunfire_led  leds[NUM_LEDS_PER_BOARD];
};

static int __devinit sunfire_led_generic_probe(struct platform_device *pdev,
                           struct led_type *types)
{
    struct sunfire_drvdata *p;
    int i, err;

    if (pdev->num_resources != 1) {
        printk(KERN_ERR PFX "Wrong number of resources %d, should be 1\n",
               pdev->num_resources);
        return -EINVAL;
    }

    p = devm_kzalloc(&pdev->dev, sizeof(*p), GFP_KERNEL);
    if (!p) {
        printk(KERN_ERR PFX "Could not allocate struct sunfire_drvdata\n");
        return -ENOMEM;
    }

    for (i = 0; i < NUM_LEDS_PER_BOARD; i++) {
        struct led_classdev *lp = &p->leds[i].led_cdev;

        p->leds[i].reg = (void __iomem *) pdev->resource[0].start;
        lp->name = types[i].name;
        lp->brightness = LED_FULL;
        lp->brightness_set = types[i].handler;
        lp->default_trigger = types[i].default_trigger;

        err = led_classdev_register(&pdev->dev, lp);
        if (err) {
            printk(KERN_ERR PFX "Could not register %s LED\n",
                   lp->name);
            for (i--; i >= 0; i--)
                led_classdev_unregister(&p->leds[i].led_cdev);
            return err;
        }
    }

    dev_set_drvdata(&pdev->dev, p);

    return 0;
}

static int __devexit sunfire_led_generic_remove(struct platform_device *pdev)
{
    struct sunfire_drvdata *p = dev_get_drvdata(&pdev->dev);
    int i;

    for (i = 0; i < NUM_LEDS_PER_BOARD; i++)
        led_classdev_unregister(&p->leds[i].led_cdev);

    return 0;
}

static struct led_type clockboard_led_types[NUM_LEDS_PER_BOARD] = {
    {
        .name       = "clockboard-left",
        .handler    = clockboard_left_set,
    },
    {
        .name       = "clockboard-middle",
        .handler    = clockboard_middle_set,
    },
    {
        .name       = "clockboard-right",
        .handler    = clockboard_right_set,
        .default_trigger= "heartbeat",
    },
};

static int __devinit sunfire_clockboard_led_probe(struct platform_device *pdev)
{
    return sunfire_led_generic_probe(pdev, clockboard_led_types);
}

static struct led_type fhc_led_types[NUM_LEDS_PER_BOARD] = {
    {
        .name       = "fhc-left",
        .handler    = fhc_left_set,
    },
    {
        .name       = "fhc-middle",
        .handler    = fhc_middle_set,
    },
    {
        .name       = "fhc-right",
        .handler    = fhc_right_set,
        .default_trigger= "heartbeat",
    },
};

static int __devinit sunfire_fhc_led_probe(struct platform_device *pdev)
{
    return sunfire_led_generic_probe(pdev, fhc_led_types);
}

MODULE_ALIAS("platform:sunfire-clockboard-leds");
MODULE_ALIAS("platform:sunfire-fhc-leds");

static struct platform_driver sunfire_clockboard_led_driver = {
    .probe      = sunfire_clockboard_led_probe,
    .remove     = __devexit_p(sunfire_led_generic_remove),
    .driver     = {
        .name   = "sunfire-clockboard-leds",
        .owner  = THIS_MODULE,
    },
};

static struct platform_driver sunfire_fhc_led_driver = {
    .probe      = sunfire_fhc_led_probe,
    .remove     = __devexit_p(sunfire_led_generic_remove),
    .driver     = {
        .name   = "sunfire-fhc-leds",
        .owner  = THIS_MODULE,
    },
};

static int __init sunfire_leds_init(void)
{
    int err = platform_driver_register(&sunfire_clockboard_led_driver);

    if (err) {
        printk(KERN_ERR PFX "Could not register clock board LED driver\n");
        return err;
    }

    err = platform_driver_register(&sunfire_fhc_led_driver);
    if (err) {
        printk(KERN_ERR PFX "Could not register FHC LED driver\n");
        platform_driver_unregister(&sunfire_clockboard_led_driver);
    }

    return err;
}

static void __exit sunfire_leds_exit(void)
{
    platform_driver_unregister(&sunfire_clockboard_led_driver);
    platform_driver_unregister(&sunfire_fhc_led_driver);
}

module_init(sunfire_leds_init);
module_exit(sunfire_leds_exit);