Commit 92e015cb authored by Márton Németh's avatar Márton Németh Committed by Richard Purdie
Browse files

leds: hw acceleration for Clevo mail LED driver 



Add support for hardware accelerated LED blinking for the mail LED
commonly found on Clevo notebooks.

Signed-off-by: default avatarMárton Németh <nm127@freemail.hu>
Signed-off-by: default avatarRichard Purdie <rpurdie@rpsys.net>
parent 4c79141d

drivers/leds/Kconfig

+5 −3
Original line number Diff line number Diff line
@@ -122,9 +122,11 @@ config LEDS_CLEVO_MAIL 
	  programs through the leds subsystem. This LED have three

	  known mode: off, blink at 0.5Hz and blink at 1Hz.



	  As this LED cannot change it's brightness it blinks instead.

	  The brightness value 0 means off, 1..127 means blink at 0.5Hz

	  and 128..255 means blink at 1Hz.

	  The driver supports two kinds of interface: using ledtrig-timer

	  or through /sys/class/leds/clevo::mail/brightness. As this LED

	  cannot change it's brightness it blinks instead. The brightness

	  value 0 means off, 1..127 means blink at 0.5Hz and 128..255 means

	  blink at 1Hz.



	  This module can drive the mail LED for the following notebooks:

drivers/leds/leds-clevo-mail.c

+37 −0
Original line number Diff line number Diff line
@@ -92,9 +92,46 @@ static void clevo_mail_led_set(struct led_classdev *led_cdev, 


}



static int clevo_mail_led_blink(struct led_classdev *led_cdev,

				unsigned long* delay_on,

				unsigned long* delay_off)

{

	int status = -EINVAL;



	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);

	}



	return status;

}



static struct led_classdev clevo_mail_led = {

	.name			= "clevo::mail",

	.brightness_set		= clevo_mail_led_set,

	.blink_set		= clevo_mail_led_blink,

};



static int __init clevo_mail_led_probe(struct platform_device *pdev)