Commit 4da498fc authored by Linus Walleij's avatar Linus Walleij Committed by Bryan Wu
Browse files

leds: add driver for the iPAQ micro 



This adds a driver for the iPAQ microcontroller LED.

Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: default avatarBryan Wu <cooloney@gmail.com>
parent 5995eb6d

drivers/leds/Kconfig

+7 −0
Original line number Diff line number Diff line
@@ -143,6 +143,13 @@ config LEDS_SUNFIRE 
	  This option enables support for the Left, Middle, and Right

	  LEDs on the I/O and CPU boards of SunFire UltraSPARC servers.



config LEDS_IPAQ_MICRO

	tristate "LED Support for the Compaq iPAQ h3xxx"

	depends on MFD_IPAQ_MICRO

	help

	  Choose this option if you want to use the notification LED on

	  Compaq/HP iPAQ h3100 and h3600.



config LEDS_HP6XX

	tristate "LED Support for the HP Jornada 6xx"

	depends on LEDS_CLASS

drivers/leds/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -31,6 +31,7 @@ obj-$(CONFIG_LEDS_LP8501) += leds-lp8501.o 
obj-$(CONFIG_LEDS_LP8788)		+= leds-lp8788.o

obj-$(CONFIG_LEDS_TCA6507)		+= leds-tca6507.o

obj-$(CONFIG_LEDS_CLEVO_MAIL)		+= leds-clevo-mail.o

obj-$(CONFIG_LEDS_IPAQ_MICRO)		+= leds-ipaq-micro.o

obj-$(CONFIG_LEDS_HP6XX)		+= leds-hp6xx.o

obj-$(CONFIG_LEDS_OT200)		+= leds-ot200.o

obj-$(CONFIG_LEDS_FSG)			+= leds-fsg.o

drivers/leds/leds-ipaq-micro.c

0 → 100644
+141 −0
Original line number Diff line number Diff line 
/*

 * 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.

 *

 * h3xxx atmel micro companion support, notification LED subdevice

 *

 * Author : Linus Walleij <linus.walleij@linaro.org>

 */



#include <linux/module.h>

#include <linux/platform_device.h>

#include <linux/mfd/ipaq-micro.h>

#include <linux/leds.h>



#define LED_YELLOW	0x00

#define LED_GREEN	0x01



#define LED_EN          (1 << 4)        /* LED ON/OFF 0:off, 1:on                       */

#define LED_AUTOSTOP    (1 << 5)        /* LED ON/OFF auto stop set 0:disable, 1:enable */

#define LED_ALWAYS      (1 << 6)        /* LED Interrupt Mask 0:No mask, 1:mask         */



static void micro_leds_brightness_set(struct led_classdev *led_cdev,

				      enum led_brightness value)

{

	struct ipaq_micro *micro = dev_get_drvdata(led_cdev->dev->parent->parent);

	/*

	 * In this message:

	 * Byte 0 = LED color: 0 = yellow, 1 = green

	 *          yellow LED is always ~30 blinks per minute

	 * Byte 1 = duration (flags?) appears to be ignored

	 * Byte 2 = green ontime in 1/10 sec (deciseconds)

	 *          1 = 1/10 second

	 *          0 = 256/10 second

	 * Byte 3 = green offtime in 1/10 sec (deciseconds)

	 *          1 = 1/10 second

	 *          0 = 256/10 seconds

	 */

	struct ipaq_micro_msg msg = {

		.id = MSG_NOTIFY_LED,

		.tx_len = 4,

	};



	msg.tx_data[0] = LED_GREEN;

	msg.tx_data[1] = 0;

	if (value) {

		msg.tx_data[2] = 0; /* Duty cycle 256 */

		msg.tx_data[3] = 1;

	} else {

		msg.tx_data[2] = 1;

		msg.tx_data[3] = 0; /* Duty cycle 256 */

	}

	ipaq_micro_tx_msg_sync(micro, &msg);

}



/* Maximum duty cycle in ms 256/10 sec = 25600 ms */

#define IPAQ_LED_MAX_DUTY 25600



static int micro_leds_blink_set(struct led_classdev *led_cdev,

				unsigned long *delay_on,

				unsigned long *delay_off)

{

	struct ipaq_micro *micro = dev_get_drvdata(led_cdev->dev->parent->parent);

	/*

	 * In this message:

	 * Byte 0 = LED color: 0 = yellow, 1 = green

	 *          yellow LED is always ~30 blinks per minute

	 * Byte 1 = duration (flags?) appears to be ignored

	 * Byte 2 = green ontime in 1/10 sec (deciseconds)

	 *          1 = 1/10 second

	 *          0 = 256/10 second

	 * Byte 3 = green offtime in 1/10 sec (deciseconds)

	 *          1 = 1/10 second

	 *          0 = 256/10 seconds

	 */

	struct ipaq_micro_msg msg = {

		.id = MSG_NOTIFY_LED,

		.tx_len = 4,

	};



	msg.tx_data[0] = LED_GREEN;

        if (*delay_on > IPAQ_LED_MAX_DUTY ||

	    *delay_off > IPAQ_LED_MAX_DUTY)

                return -EINVAL;



        if (*delay_on == 0 && *delay_off == 0) {

                *delay_on = 100;

                *delay_off = 100;

        }



	msg.tx_data[1] = 0;

	if (*delay_on >= IPAQ_LED_MAX_DUTY)

		msg.tx_data[2] = 0;

	else

		msg.tx_data[2] = (u8) DIV_ROUND_CLOSEST(*delay_on, 100);

	if (*delay_off >= IPAQ_LED_MAX_DUTY)

		msg.tx_data[3] = 0;

	else

		msg.tx_data[3] = (u8) DIV_ROUND_CLOSEST(*delay_off, 100);

	return ipaq_micro_tx_msg_sync(micro, &msg);

}



static struct led_classdev micro_led = {

	.name			= "led-ipaq-micro",

	.brightness_set		= micro_leds_brightness_set,

	.blink_set		= micro_leds_blink_set,

	.flags			= LED_CORE_SUSPENDRESUME,

};



static int micro_leds_probe(struct platform_device *pdev)

{

	int ret;



	ret = led_classdev_register(&pdev->dev, &micro_led);

	if (ret) {

		dev_err(&pdev->dev, "registering led failed: %d\n", ret);

		return ret;

	}

	dev_info(&pdev->dev, "iPAQ micro notification LED driver\n");



	return 0;

}



static int micro_leds_remove(struct platform_device *pdev)

{

	led_classdev_unregister(&micro_led);

	return 0;

}



struct platform_driver micro_leds_device_driver = {

	.driver = {

		.name    = "ipaq-micro-leds",

	},

	.probe   = micro_leds_probe,

	.remove  = micro_leds_remove,

};

module_platform_driver(micro_leds_device_driver);



MODULE_LICENSE("GPL");

MODULE_DESCRIPTION("driver for iPAQ Atmel micro leds");

MODULE_ALIAS("platform:ipaq-micro-leds");