mirror of https://gitee.com/openkylin/linux.git
platform/x86: ideapad-laptop: add keyboard backlight control support
On certain models it is possible to control/query the keyboard backlight via the SALS/HALS ACPI methods. Add support for that, and register an LED class device to expose this functionality. Tested on: Lenovo YOGA 520-14IKB 80X8 Signed-off-by: Barnabás Pőcze <pobrn@protonmail.com> Link: https://lore.kernel.org/r/20210203215403.290792-27-pobrn@protonmail.com Reviewed-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Barnabás Pőcze
Hans de Goede
parent
c67957464e
commit
503325f84b
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@ -11,6 +11,7 @@
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#include <linux/acpi.h>
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#include <linux/backlight.h>
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#include <linux/bitops.h>
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#include <linux/bug.h>
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#include <linux/debugfs.h>
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#include <linux/device.h>
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#include <linux/dmi.h>
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@ -21,6 +22,7 @@
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#include <linux/input/sparse-keymap.h>
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#include <linux/jiffies.h>
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#include <linux/kernel.h>
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#include <linux/leds.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/platform_profile.h>
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@ -31,6 +33,8 @@
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#include <acpi/video.h>
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#include <dt-bindings/leds/common.h>
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#define IDEAPAD_RFKILL_DEV_NUM 3
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#if IS_ENABLED(CONFIG_ACPI_WMI)
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@ -58,12 +62,16 @@ enum {
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};
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enum {
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HALS_KBD_BL_SUPPORT_BIT = 4,
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HALS_KBD_BL_STATE_BIT = 5,
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HALS_FNLOCK_SUPPORT_BIT = 9,
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HALS_FNLOCK_STATE_BIT = 10,
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HALS_HOTKEYS_PRIMARY_BIT = 11,
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};
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enum {
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SALS_KBD_BL_ON = 0x8,
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SALS_KBD_BL_OFF = 0x9,
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SALS_FNLOCK_ON = 0xe,
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SALS_FNLOCK_OFF = 0xf,
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};
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@ -124,8 +132,14 @@ struct ideapad_private {
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bool fan_mode : 1;
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bool fn_lock : 1;
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bool hw_rfkill_switch : 1;
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bool kbd_bl : 1;
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bool touchpad_ctrl_via_ec : 1;
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} features;
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struct {
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bool initialized;
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struct led_classdev led;
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unsigned int last_brightness;
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} kbd_bl;
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};
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static bool no_bt_rfkill;
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@ -1200,6 +1214,108 @@ static void ideapad_backlight_notify_brightness(struct ideapad_private *priv)
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backlight_force_update(priv->blightdev, BACKLIGHT_UPDATE_HOTKEY);
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}
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/*
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* keyboard backlight
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*/
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static int ideapad_kbd_bl_brightness_get(struct ideapad_private *priv)
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{
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unsigned long hals;
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int err;
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err = eval_hals(priv->adev->handle, &hals);
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if (err)
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return err;
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return !!test_bit(HALS_KBD_BL_STATE_BIT, &hals);
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}
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static enum led_brightness ideapad_kbd_bl_led_cdev_brightness_get(struct led_classdev *led_cdev)
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{
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struct ideapad_private *priv = container_of(led_cdev, struct ideapad_private, kbd_bl.led);
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return ideapad_kbd_bl_brightness_get(priv);
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}
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static int ideapad_kbd_bl_brightness_set(struct ideapad_private *priv, unsigned int brightness)
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{
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int err = exec_sals(priv->adev->handle, brightness ? SALS_KBD_BL_ON : SALS_KBD_BL_OFF);
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if (err)
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return err;
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priv->kbd_bl.last_brightness = brightness;
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return 0;
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}
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static int ideapad_kbd_bl_led_cdev_brightness_set(struct led_classdev *led_cdev,
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enum led_brightness brightness)
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{
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struct ideapad_private *priv = container_of(led_cdev, struct ideapad_private, kbd_bl.led);
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return ideapad_kbd_bl_brightness_set(priv, brightness);
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}
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static void ideapad_kbd_bl_notify(struct ideapad_private *priv)
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{
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int brightness;
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if (!priv->kbd_bl.initialized)
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return;
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brightness = ideapad_kbd_bl_brightness_get(priv);
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if (brightness < 0)
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return;
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if (brightness == priv->kbd_bl.last_brightness)
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return;
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priv->kbd_bl.last_brightness = brightness;
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led_classdev_notify_brightness_hw_changed(&priv->kbd_bl.led, brightness);
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}
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static int ideapad_kbd_bl_init(struct ideapad_private *priv)
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{
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int brightness, err;
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if (!priv->features.kbd_bl)
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return -ENODEV;
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if (WARN_ON(priv->kbd_bl.initialized))
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return -EEXIST;
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brightness = ideapad_kbd_bl_brightness_get(priv);
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if (brightness < 0)
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return brightness;
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priv->kbd_bl.last_brightness = brightness;
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priv->kbd_bl.led.name = "platform::" LED_FUNCTION_KBD_BACKLIGHT;
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priv->kbd_bl.led.max_brightness = 1;
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priv->kbd_bl.led.brightness_get = ideapad_kbd_bl_led_cdev_brightness_get;
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priv->kbd_bl.led.brightness_set_blocking = ideapad_kbd_bl_led_cdev_brightness_set;
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priv->kbd_bl.led.flags = LED_BRIGHT_HW_CHANGED;
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err = led_classdev_register(&priv->platform_device->dev, &priv->kbd_bl.led);
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if (err)
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return err;
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priv->kbd_bl.initialized = true;
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return 0;
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}
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static void ideapad_kbd_bl_exit(struct ideapad_private *priv)
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{
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if (!priv->kbd_bl.initialized)
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return;
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priv->kbd_bl.initialized = false;
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led_classdev_unregister(&priv->kbd_bl.led);
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}
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/*
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* module init/exit
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*/
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@ -1267,8 +1383,10 @@ static void ideapad_acpi_notify(acpi_handle handle, u32 event, void *data)
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* Some IdeaPads report event 1 every ~20
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* seconds while on battery power; some
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* report this when changing to/from tablet
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* mode. Squelch this event.
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* mode; some report this when the keyboard
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* backlight has changed.
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*/
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ideapad_kbd_bl_notify(priv);
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break;
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case 0:
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ideapad_check_special_buttons(priv);
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@ -1338,6 +1456,9 @@ static void ideapad_check_features(struct ideapad_private *priv)
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if (!eval_hals(handle, &val)) {
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if (test_bit(HALS_FNLOCK_SUPPORT_BIT, &val))
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priv->features.fn_lock = true;
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if (test_bit(HALS_KBD_BL_SUPPORT_BIT, &val))
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priv->features.kbd_bl = true;
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}
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}
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}
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@ -1379,6 +1500,14 @@ static int ideapad_acpi_add(struct platform_device *pdev)
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if (err)
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goto input_failed;
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err = ideapad_kbd_bl_init(priv);
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if (err) {
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if (err != -ENODEV)
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dev_warn(&pdev->dev, "Could not set up keyboard backlight LED: %d\n", err);
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else
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dev_info(&pdev->dev, "Keyboard backlight control not available\n");
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}
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/*
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* On some models without a hw-switch (the yoga 2 13 at least)
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* VPCCMD_W_RF must be explicitly set to 1 for the wifi to work.
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@ -1453,6 +1582,7 @@ static int ideapad_acpi_add(struct platform_device *pdev)
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for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++)
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ideapad_unregister_rfkill(priv, i);
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ideapad_kbd_bl_exit(priv);
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ideapad_input_exit(priv);
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input_failed:
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@ -1482,6 +1612,7 @@ static int ideapad_acpi_remove(struct platform_device *pdev)
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for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++)
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ideapad_unregister_rfkill(priv, i);
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ideapad_kbd_bl_exit(priv);
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ideapad_input_exit(priv);
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ideapad_debugfs_exit(priv);
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ideapad_sysfs_exit(priv);
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