leds-clevo-mail.c

Go to the documentation of this file.

#include <linux/module.h>

#include <linux/platform_device.h>
#include <linux/err.h>
#include <linux/leds.h>

#include <linux/io.h>
#include <linux/dmi.h>

#include <linux/i8042.h>

#define CLEVO_MAIL_LED_OFF      0x0084
#define CLEVO_MAIL_LED_BLINK_1HZ    0x008A
#define CLEVO_MAIL_LED_BLINK_0_5HZ  0x0083

MODULE_AUTHOR("Márton Németh <[email protected]>");
MODULE_DESCRIPTION("Clevo mail LED driver");
MODULE_LICENSE("GPL");

static bool __initdata nodetect;
module_param_named(nodetect, nodetect, bool, 0);
MODULE_PARM_DESC(nodetect, "Skip DMI hardware detection");

static struct platform_device *pdev;

static int __init clevo_mail_led_dmi_callback(const struct dmi_system_id *id)
{
    printk(KERN_INFO KBUILD_MODNAME ": '%s' found\n", id->ident);
    return 1;
}

/*
 * struct clevo_mail_led_dmi_table - List of known good models
 *
 * Contains the known good models this driver is compatible with.
 * When adding a new model try to be as strict as possible. This
 * makes it possible to keep the false positives (the model is
 * detected as working, but in reality it is not) as low as
 * possible.
 */
static struct dmi_system_id __initdata clevo_mail_led_dmi_table[] = {
    {
        .callback = clevo_mail_led_dmi_callback,
        .ident = "Clevo D410J",
        .matches = {
            DMI_MATCH(DMI_SYS_VENDOR, "VIA"),
            DMI_MATCH(DMI_PRODUCT_NAME, "K8N800"),
            DMI_MATCH(DMI_PRODUCT_VERSION, "VT8204B")
        }
    },
    {
        .callback = clevo_mail_led_dmi_callback,
        .ident = "Clevo M5x0N",
        .matches = {
            DMI_MATCH(DMI_SYS_VENDOR, "CLEVO Co."),
            DMI_MATCH(DMI_PRODUCT_NAME, "M5x0N")
        }
    },
    {
        .callback = clevo_mail_led_dmi_callback,
        .ident = "Clevo M5x0V",
        .matches = {
            DMI_MATCH(DMI_BOARD_VENDOR, "CLEVO Co. "),
            DMI_MATCH(DMI_BOARD_NAME, "M5X0V "),
            DMI_MATCH(DMI_PRODUCT_VERSION, "VT6198")
        }
    },
    {
        .callback = clevo_mail_led_dmi_callback,
        .ident = "Clevo D400P",
        .matches = {
            DMI_MATCH(DMI_BOARD_VENDOR, "Clevo"),
            DMI_MATCH(DMI_BOARD_NAME, "D400P"),
            DMI_MATCH(DMI_BOARD_VERSION, "Rev.A"),
            DMI_MATCH(DMI_PRODUCT_VERSION, "0106")
        }
    },
    {
        .callback = clevo_mail_led_dmi_callback,
        .ident = "Clevo D410V",
        .matches = {
            DMI_MATCH(DMI_BOARD_VENDOR, "Clevo, Co."),
            DMI_MATCH(DMI_BOARD_NAME, "D400V/D470V"),
            DMI_MATCH(DMI_BOARD_VERSION, "SS78B"),
            DMI_MATCH(DMI_PRODUCT_VERSION, "Rev. A1")
        }
    },
    { }
};
MODULE_DEVICE_TABLE(dmi, clevo_mail_led_dmi_table);

static void clevo_mail_led_set(struct led_classdev *led_cdev,
                enum led_brightness value)
{
    i8042_lock_chip();

    if (value == LED_OFF)
        i8042_command(NULL, CLEVO_MAIL_LED_OFF);
    else if (value <= LED_HALF)
        i8042_command(NULL, CLEVO_MAIL_LED_BLINK_0_5HZ);
    else
        i8042_command(NULL, CLEVO_MAIL_LED_BLINK_1HZ);

    i8042_unlock_chip();

}

static int clevo_mail_led_blink(struct led_classdev *led_cdev,
                unsigned long *delay_on,
                unsigned long *delay_off)
{
    int status = -EINVAL;

    i8042_lock_chip();

    if (*delay_on == 0 /* ms */ && *delay_off == 0 /* ms */) {
        /* Special case: the leds subsystem requested us to
         * chose one user friendly blinking of the LED, and
         * start it. Let's blink the led slowly (0.5Hz).
         */
        *delay_on = 1000; /* ms */
        *delay_off = 1000; /* ms */
        i8042_command(NULL, CLEVO_MAIL_LED_BLINK_0_5HZ);
        status = 0;

    } else if (*delay_on == 500 /* ms */ && *delay_off == 500 /* ms */) {
        /* blink the led with 1Hz */
        i8042_command(NULL, CLEVO_MAIL_LED_BLINK_1HZ);
        status = 0;

    } else if (*delay_on == 1000 /* ms */ && *delay_off == 1000 /* ms */) {
        /* blink the led with 0.5Hz */
        i8042_command(NULL, CLEVO_MAIL_LED_BLINK_0_5HZ);
        status = 0;

    } else {
        printk(KERN_DEBUG KBUILD_MODNAME
               ": clevo_mail_led_blink(..., %lu, %lu),"
               " returning -EINVAL (unsupported)\n",
               *delay_on, *delay_off);
    }

    i8042_unlock_chip();

    return status;
}

static struct led_classdev clevo_mail_led = {
    .name           = "clevo::mail",
    .brightness_set     = clevo_mail_led_set,
    .blink_set      = clevo_mail_led_blink,
    .flags          = LED_CORE_SUSPENDRESUME,
};

static int __devinit clevo_mail_led_probe(struct platform_device *pdev)
{
    return led_classdev_register(&pdev->dev, &clevo_mail_led);
}

static int clevo_mail_led_remove(struct platform_device *pdev)
{
    led_classdev_unregister(&clevo_mail_led);
    return 0;
}

static struct platform_driver clevo_mail_led_driver = {
    .probe      = clevo_mail_led_probe,
    .remove     = clevo_mail_led_remove,
    .driver     = {
        .name       = KBUILD_MODNAME,
        .owner      = THIS_MODULE,
    },
};

static int __init clevo_mail_led_init(void)
{
    int error = 0;
    int count = 0;

    /* Check with the help of DMI if we are running on supported hardware */
    if (!nodetect) {
        count = dmi_check_system(clevo_mail_led_dmi_table);
    } else {
        count = 1;
        printk(KERN_ERR KBUILD_MODNAME ": Skipping DMI detection. "
               "If the driver works on your hardware please "
               "report model and the output of dmidecode in tracker "
               "at http://sourceforge.net/projects/clevo-mailled/\n");
    }

    if (!count)
        return -ENODEV;

    pdev = platform_device_register_simple(KBUILD_MODNAME, -1, NULL, 0);
    if (!IS_ERR(pdev)) {
        error = platform_driver_probe(&clevo_mail_led_driver,
                          clevo_mail_led_probe);
        if (error) {
            printk(KERN_ERR KBUILD_MODNAME
                   ": Can't probe platform driver\n");
            platform_device_unregister(pdev);
        }
    } else
        error = PTR_ERR(pdev);

    return error;
}

static void __exit clevo_mail_led_exit(void)
{
    platform_device_unregister(pdev);
    platform_driver_unregister(&clevo_mail_led_driver);

    clevo_mail_led_set(NULL, LED_OFF);
}

module_init(clevo_mail_led_init);
module_exit(clevo_mail_led_exit);