[PATCH] Integrate asus_acpi LED's with new LED subsystem

[Thomas Tuttle <thinkinginbinary@gmail.com>]

(Sorry to repost... just going through the motions of ChangeLog and
Signed-off-by headers.)

Here is a patch to the asus_acpi driver that links the Asus laptop LED's
into the new LED subsystem.  It creates LED class devices named
asus:mail, asus:wireless, and asus:touchpad, depending on if the laptop
supports the mled, wled, and tled LED's.

Since it's so new, I added a config option to turn it on and off.  It's
worked for me, though I have an Asus M2N, which only has the mail and
wireless LED's.

Signed-off-by: Thomas Tuttle <thinkinginbinary@gmail.com>

diff -udrN linux-2.6.17-git25/drivers/acpi/asus_acpi.c linux-2.6.17-git25-mine/drivers/acpi/asus_acpi.c
--- linux-2.6.17-git25/drivers/acpi/asus_acpi.c	2006-07-05 22:11:37.000000000 -0400
+++ linux-2.6.17-git25-mine/drivers/acpi/asus_acpi.c	2006-07-05 22:26:51.000000000 -0400
@@ -27,14 +27,19 @@
  *  Johann Wiesner - Small compile fixes
  *  John Belmonte  - ACPI code for Toshiba laptop was a good starting point.
  *  �ric Burghard  - LED display support for W1N
+ *  Thomas Tuttle  - LED subsystem integration
  *
  */
 
+#include <linux/config.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/types.h>
 #include <linux/proc_fs.h>
+#ifdef CONFIG_ACPI_ASUS_NEW_LED
+#include <linux/leds.h>
+#endif
 #include <acpi/acpi_drivers.h>
 #include <acpi/acpi_bus.h>
 #include <asm/uaccess.h>
@@ -916,6 +921,145 @@
 	return 0;
 }
 
+#ifdef CONFIG_ACPI_ASUS_NEW_LED
+                
+/* These functions are called by the LED subsystem to update the desired
+ * state of the LED's. */
+static void led_set_mled(struct led_classdev *led_cdev,
+                                enum led_brightness value);
+static void led_set_wled(struct led_classdev *led_cdev,
+                                enum led_brightness value);
+static void led_set_tled(struct led_classdev *led_cdev,
+                                enum led_brightness value);
+
+/* LED class devices. */
+static struct led_classdev led_cdev_mled =
+        { .name = "asus:mail",     .brightness_set = led_set_mled };
+static struct led_classdev led_cdev_wled =
+        { .name = "asus:wireless", .brightness_set = led_set_wled };
+static struct led_classdev led_cdev_tled =
+        { .name = "asus:touchpad", .brightness_set = led_set_tled };
+
+/* These functions actually update the LED's, and are called from a
+ * workqueue.  By doing this as separate work rather than when the LED
+ * subsystem asks, I avoid messing with the Asus ACPI stuff during a
+ * potentially bad time, such as a timer interrupt. */
+static void led_update_mled(void *private);
+static void led_update_wled(void *private);
+static void led_update_tled(void *private);
+                
+/* Desired values of LED's. */
+static int led_mled_value = 0; 
+static int led_wled_value = 0;
+static int led_tled_value = 0; 
+
+/* LED workqueue. */
+static struct workqueue_struct *led_workqueue;
+
+/* LED update work structs. */
+DECLARE_WORK(led_mled_work, led_update_mled, NULL);
+DECLARE_WORK(led_wled_work, led_update_wled, NULL);
+DECLARE_WORK(led_tled_work, led_update_tled, NULL);
+                
+/* LED subsystem callbacks. */
+static void led_set_mled(struct led_classdev *led_cdev,
+        enum led_brightness value)
+{       
+        led_mled_value = value;
+        queue_work(led_workqueue, &led_mled_work);
+}
+
+static void led_set_wled(struct led_classdev *led_cdev,
+        enum led_brightness value)
+{
+        led_wled_value = value;
+        queue_work(led_workqueue, &led_wled_work);
+}       
+        
+static void led_set_tled(struct led_classdev *led_cdev,
+        enum led_brightness value)
+{       
+        led_tled_value = value; 
+        queue_work(led_workqueue, &led_tled_work);
+}       
+            
+/* LED work functions. */
+static void led_update_mled(void *private) {
+        char *ledname = hotk->methods->mt_mled;
+        int led_out = led_mled_value ? 1 : 0;
+        hotk->status = (led_out) ? (hotk->status | MLED_ON) : (hotk->status & ~MLED_ON);
+        led_out = 1 - led_out;
+        if (!write_acpi_int(hotk->handle, ledname, led_out, NULL))
+                printk(KERN_WARNING "Asus ACPI: LED (%s) write failed\n",
+                       ledname);
+}
+
+static void led_update_wled(void *private) {
+        char *ledname = hotk->methods->mt_wled;
+        int led_out = led_wled_value ? 1 : 0;
+        hotk->status = (led_out) ? (hotk->status | WLED_ON) : (hotk->status & ~WLED_ON);
+        if (!write_acpi_int(hotk->handle, ledname, led_out, NULL))
+                printk(KERN_WARNING "Asus ACPI: LED (%s) write failed\n",
+                       ledname);
+}
+
+static void led_update_tled(void *private) {
+        char *ledname = hotk->methods->mt_tled;
+        int led_out = led_tled_value ? 1 : 0;
+        hotk->status = (led_out) ? (hotk->status | TLED_ON) : (hotk->status & ~TLED_ON);
+        if (!write_acpi_int(hotk->handle, ledname, led_out, NULL))
+                printk(KERN_WARNING "Asus ACPI: LED (%s) write failed\n",
+                       ledname);
+}
+
+/* Registers LED class devices and sets up workqueue. */
+static int led_initialize(struct device *parent)
+{
+        int result;
+
+        if (hotk->methods->mt_mled) {
+                result = led_classdev_register(parent, &led_cdev_mled);
+                if (result)
+                        return result;
+        }
+
+        if (hotk->methods->mt_wled) {
+                result = led_classdev_register(parent, &led_cdev_wled);
+                if (result)
+                        return result;
+        }
+
+        if (hotk->methods->mt_tled) {
+                result = led_classdev_register(parent, &led_cdev_tled);
+                if (result)
+                        return result;
+        }
+
+        led_workqueue = create_singlethread_workqueue("led_workqueue");
+
+        return 0;
+}
+
+/* Destroys the workqueue and unregisters the LED class devices. */
+static void led_terminate(void)
+{
+        destroy_workqueue(led_workqueue);
+
+        if (hotk->methods->mt_tled) {
+                led_classdev_unregister(&led_cdev_tled);
+        }
+
+        if (hotk->methods->mt_wled) {
+                led_classdev_unregister(&led_cdev_wled);
+        }
+        
+        if (hotk->methods->mt_mled) {
+                led_classdev_unregister(&led_cdev_mled);
+        }
+}
+
+#endif
+
 static int asus_hotk_add_fs(struct acpi_device *device)
 {
 	struct proc_dir_entry *proc;
@@ -1299,6 +1443,10 @@
 	/* LED display is off by default */
 	hotk->ledd_status = 0xFFF;
 
+#ifdef CONFIG_ACPI_ASUS_NEW_LED
+        result = led_initialize(acpi_get_physical_device(device->handle));
+#endif
+
       end:
 	if (result) {
 		kfree(hotk);
@@ -1314,6 +1462,10 @@
 	if (!device || !acpi_driver_data(device))
 		return -EINVAL;
 
+#ifdef CONFIG_ACPI_ASUS_NEW_LED
+        led_terminate();
+#endif          
+
 	status = acpi_remove_notify_handler(hotk->handle, ACPI_SYSTEM_NOTIFY,
 					    asus_hotk_notify);
 	if (ACPI_FAILURE(status))
diff -udrN linux-2.6.17-git25/drivers/acpi/Kconfig linux-2.6.17-git25-mine/drivers/acpi/Kconfig
--- linux-2.6.17-git25/drivers/acpi/Kconfig	2006-07-05 22:44:33.000000000 -0400
+++ linux-2.6.17-git25-mine/drivers/acpi/Kconfig	2006-07-05 22:44:43.000000000 -0400
@@ -199,6 +199,15 @@
           something works not quite as expected, please use the mailing list
           available on the above page (acpi4asus-user@lists.sourceforge.net)
           
+config ACPI_ASUS_NEW_LED
+        bool "ASUS/Medion LED subsystem integration"
+        depends on ACPI_ASUS
+        depends on LEDS_CLASS
+        help
+          This adds support for the new LED subsystem to the asus_acpi
+          driver.  The LED's will show up as asus:mail, asus:wireless,
+          and asus:touchpad, as applicable to your laptop.
+
 config ACPI_IBM
 	tristate "IBM ThinkPad Laptop Extras"
 	depends on X86

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