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// SPDX-License-Identifier: GPL-2.0-only
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#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 <nm127@freemail.hu>");
MODULE_DESCRIPTION("Clevo mail LED driver");
MODULE_LICENSE("GPL");
static bool 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)
{
pr_info("'%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 const struct dmi_system_id clevo_mail_led_dmi_table[] __initconst = {
{
.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 {
pr_debug("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 __init clevo_mail_led_probe(struct platform_device *pdev)
{
return led_classdev_register(&pdev->dev, &clevo_mail_led);
}
static void clevo_mail_led_remove(struct platform_device *pdev)
{
led_classdev_unregister(&clevo_mail_led);
}
static struct platform_driver clevo_mail_led_driver = {
.remove = clevo_mail_led_remove,
.driver = {
.name = KBUILD_MODNAME,
},
};
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;
pr_err("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) {
pr_err("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);
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