toshiba-acpi: Add support for Toshiba Illumination.

Add support for Toshiba Illumination. This is a set of LEDs installed on
some Toshiba laptops. It is controlled through ACPI, the commands has been
found through reverse engineering. It has been tested on a Toshiba Qosmio
G50-122.

Signed-off-by: Pierre Ducroquet <pinaraf@pinaraf.info>
Signed-off-by: Matthew Garrett <mjg@redhat.com>

diff --git a/drivers/platform/x86/toshiba_acpi.c b/drivers/platform/x86/toshiba_acpi.c
index 627fc38..7d67a45 100644 (file)
--- a/drivers/platform/x86/toshiba_acpi.c
+++ b/drivers/platform/x86/toshiba_acpi.c
@@ -4,6 +4,7 @@
  *
  *  Copyright (C) 2002-2004 John Belmonte
  *  Copyright (C) 2008 Philip Langdale
+ *  Copyright (C) 2010 Pierre Ducroquet
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
@@ -47,6 +48,7 @@
 #include <linux/platform_device.h>
 #include <linux/rfkill.h>
 #include <linux/input.h>
+#include <linux/leds.h>
 #include <linux/slab.h>
 
 #include <asm/uaccess.h>
@@ -287,6 +289,7 @@ struct toshiba_acpi_dev {
        struct platform_device *p_dev;
        struct rfkill *bt_rfk;
        struct input_dev *hotkey_dev;
+       int illumination_installed;
        acpi_handle handle;
 
        const char *bt_name;
@@ -294,6 +297,110 @@ struct toshiba_acpi_dev {
        struct mutex mutex;
 };
 
+/* Illumination support */
+static int toshiba_illumination_available(void)
+{
+       u32 in[HCI_WORDS] = { 0, 0, 0, 0, 0, 0 };
+       u32 out[HCI_WORDS];
+       acpi_status status;
+
+       in[0] = 0xf100;
+       status = hci_raw(in, out);
+       if (ACPI_FAILURE(status)) {
+               printk(MY_INFO "Illumination device not available\n");
+               return 0;
+       }
+       in[0] = 0xf400;
+       status = hci_raw(in, out);
+       return 1;
+}
+
+static void toshiba_illumination_set(struct led_classdev *cdev,
+                                    enum led_brightness brightness)
+{
+       u32 in[HCI_WORDS] = { 0, 0, 0, 0, 0, 0 };
+       u32 out[HCI_WORDS];
+       acpi_status status;
+
+       /* First request : initialize communication. */
+       in[0] = 0xf100;
+       status = hci_raw(in, out);
+       if (ACPI_FAILURE(status)) {
+               printk(MY_INFO "Illumination device not available\n");
+               return;
+       }
+
+       if (brightness) {
+               /* Switch the illumination on */
+               in[0] = 0xf400;
+               in[1] = 0x14e;
+               in[2] = 1;
+               status = hci_raw(in, out);
+               if (ACPI_FAILURE(status)) {
+                       printk(MY_INFO "ACPI call for illumination failed.\n");
+                       return;
+               }
+       } else {
+               /* Switch the illumination off */
+               in[0] = 0xf400;
+               in[1] = 0x14e;
+               in[2] = 0;
+               status = hci_raw(in, out);
+               if (ACPI_FAILURE(status)) {
+                       printk(MY_INFO "ACPI call for illumination failed.\n");
+                       return;
+               }
+       }
+
+       /* Last request : close communication. */
+       in[0] = 0xf200;
+       in[1] = 0;
+       in[2] = 0;
+       hci_raw(in, out);
+}
+
+static enum led_brightness toshiba_illumination_get(struct led_classdev *cdev)
+{
+       u32 in[HCI_WORDS] = { 0, 0, 0, 0, 0, 0 };
+       u32 out[HCI_WORDS];
+       acpi_status status;
+       enum led_brightness result;
+
+       /* First request : initialize communication. */
+       in[0] = 0xf100;
+       status = hci_raw(in, out);
+       if (ACPI_FAILURE(status)) {
+               printk(MY_INFO "Illumination device not available\n");
+               return LED_OFF;
+       }
+
+       /* Check the illumination */
+       in[0] = 0xf300;
+       in[1] = 0x14e;
+       status = hci_raw(in, out);
+       if (ACPI_FAILURE(status)) {
+               printk(MY_INFO "ACPI call for illumination failed.\n");
+               return LED_OFF;
+       }
+
+       result = out[2] ? LED_FULL : LED_OFF;
+
+       /* Last request : close communication. */
+       in[0] = 0xf200;
+       in[1] = 0;
+       in[2] = 0;
+       hci_raw(in, out);
+
+       return result;
+}
+
+static struct led_classdev toshiba_led = {
+       .name           = "toshiba::illumination",
+       .max_brightness = 1,
+       .brightness_set = toshiba_illumination_set,
+       .brightness_get = toshiba_illumination_get,
+};
+
 static struct toshiba_acpi_dev toshiba_acpi = {
        .bt_name = "Toshiba Bluetooth",
 };
@@ -913,6 +1020,9 @@ static void toshiba_acpi_exit(void)
        acpi_remove_notify_handler(toshiba_acpi.handle, ACPI_DEVICE_NOTIFY,
                                   toshiba_acpi_notify);
 
+       if (toshiba_acpi.illumination_installed)
+               led_classdev_unregister(&toshiba_led);
+
        platform_device_unregister(toshiba_acpi.p_dev);
 
        return;
@@ -1007,6 +1117,13 @@ static int __init toshiba_acpi_init(void)
                }
        }
 
+       toshiba_acpi.illumination_installed = 0;
+       if (toshiba_illumination_available()) {
+               if (!led_classdev_register(&(toshiba_acpi.p_dev->dev),
+                                          &toshiba_led))
+                       toshiba_acpi.illumination_installed = 1;
+       }
+
        return 0;
 }