leds: add driver for the iPAQ micro

This adds a driver for the iPAQ microcontroller LED.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Bryan Wu <cooloney@gmail.com>

drivers/leds/Kconfig

@@ -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

@@ -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

+/*
+ * 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");