platform/x86: thinkpad_acpi: Add audio mute LED classdev support

In the upcoming change, the binding of audio mute / mic-mute LED
controls will be switched with LED trigger.  This patch is the last
piece of preparation: adding the audio mute / mic-mute LED class
devices to thinkpad_acpi driver.

Two devices, platform::mute and platform::micmute, will be added for
controlling the mute LED and mic-mute LED, respectively.  The new
prefix "platform" is the suggestion by upstream for indicating the
generic laptop attribute.

Also this selects CONFIG_LEDS_TRIGGERS and CONFIG_LEDS_TRIGGERS_AUDIO
unconditionally.  Strictly speaking, these aren't 100% mandatory, but
leaving these manual selections would lead to a functional regression
easily once after converting from the dynamic symbol binding to the
LEDs trigger in a later patch.

Acked-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
Acked-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Acked-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Acked-by: Pali Rohár <pali.rohar@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 9b9cc3c..87f70e8 100644 (file)
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -495,6 +495,8 @@ config THINKPAD_ACPI
        select NVRAM
        select NEW_LEDS
        select LEDS_CLASS
+       select LEDS_TRIGGERS
+       select LEDS_TRIGGER_AUDIO
        ---help---
          This is a driver for the IBM and Lenovo ThinkPad laptops. It adds
          support for Fn-Fx key combinations, Bluetooth control, video

diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
index fde08a9..3d2c1f5 100644 (file)
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -9203,17 +9203,58 @@ int tpacpi_led_set(int whichled, bool on)
 }
 EXPORT_SYMBOL_GPL(tpacpi_led_set);
 
+static int tpacpi_led_mute_set(struct led_classdev *led_cdev,
+                              enum led_brightness brightness)
+{
+       return tpacpi_led_set(TPACPI_LED_MUTE, brightness != LED_OFF);
+}
+
+static int tpacpi_led_micmute_set(struct led_classdev *led_cdev,
+                                 enum led_brightness brightness)
+{
+       return tpacpi_led_set(TPACPI_LED_MICMUTE, brightness != LED_OFF);
+}
+
+static struct led_classdev mute_led_cdev[] = {
+       [TPACPI_LED_MUTE] = {
+               .name           = "platform::mute",
+               .max_brightness = 1,
+               .brightness_set_blocking = tpacpi_led_mute_set,
+               .default_trigger = "audio-mute",
+       },
+       [TPACPI_LED_MICMUTE] = {
+               .name           = "platform::micmute",
+               .max_brightness = 1,
+               .brightness_set_blocking = tpacpi_led_micmute_set,
+               .default_trigger = "audio-micmute",
+       },
+};
+
 static int mute_led_init(struct ibm_init_struct *iibm)
 {
+       static enum led_audio types[] = {
+               [TPACPI_LED_MUTE] = LED_AUDIO_MUTE,
+               [TPACPI_LED_MICMUTE] = LED_AUDIO_MICMUTE,
+       };
        acpi_handle temp;
-       int i;
+       int i, err;
 
        for (i = 0; i < TPACPI_LED_MAX; i++) {
                struct tp_led_table *t = &led_tables[i];
-               if (ACPI_SUCCESS(acpi_get_handle(hkey_handle, t->name, &temp)))
-                       mute_led_on_off(t, false);
-               else
+               if (ACPI_FAILURE(acpi_get_handle(hkey_handle, t->name, &temp))) {
                        t->state = -ENODEV;
+                       continue;
+               }
+
+               mute_led_cdev[i].brightness = ledtrig_audio_get(types[i]);
+               err = led_classdev_register(&tpacpi_pdev->dev, &mute_led_cdev[i]);
+               if (err < 0) {
+                       while (i--) {
+                               if (led_tables[i].state >= 0)
+                                       led_classdev_unregister(&mute_led_cdev[i]);
+                       }
+                       return err;
+               }
        }
        return 0;
 }
@@ -9222,8 +9263,12 @@ static void mute_led_exit(void)
 {
        int i;
 
-       for (i = 0; i < TPACPI_LED_MAX; i++)
-               tpacpi_led_set(i, false);
+       for (i = 0; i < TPACPI_LED_MAX; i++) {
+               if (led_tables[i].state >= 0) {
+                       led_classdev_unregister(&mute_led_cdev[i]);
+                       tpacpi_led_set(i, false);
+               }
+       }
 }
 
 static void mute_led_resume(void)