Re: [PATCH v10 2/3] x86: add support for Huawei WMI hotkeys.

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On Tue, Dec 11, 2018 at 8:02 AM Ayman Bagabas <ayman.bagabas@xxxxxxxxx> wrote:
>
> This driver adds support for missing hotkeys on some Huawei laptops.
> Laptops such as the Matebook X have non functioning hotkeys. Whereas
> newer laptops such as the Matebook X Pro come with working hotkeys out
> of the box.
>
> Old laptops, such as the Matebook X, report hotkey events through ACPI
> device "\WMI0". However, new laptops, such as the Matebook X Pro,
> does not have this WMI device.
>
> All the hotkeys on the Matebook X Pro work fine
> without this patch except (micmute, wlan, and huawei key). These keys
> and the brightness keys report events to "\AMW0" ACPI device. One
> problem is that brightness keys on the Matebook X Pro work without this
> patch. This results in reporting two brightness key press
> events one is captured by ACPI and another by this driver.
>
> A solution would be to check if such event came from the "\AMW0" WMI driver
> then skip reporting event. Another solution would be to leave this to
> user-space to handle. Which can be achieved by using "hwdb" tables and
> remap those keys to "unknown". This solution seems more natural to me
> because it leaves the decision to user-space.
>
> Reviewed-by: Takashi Iwai <tiwai@xxxxxxx>
> Signed-off-by: Ayman Bagabas <ayman.bagabas@xxxxxxxxx>
> ---
>  drivers/platform/x86/Kconfig      |  17 +++
>  drivers/platform/x86/Makefile     |   1 +
>  drivers/platform/x86/huawei-wmi.c | 220 ++++++++++++++++++++++++++++++
>  3 files changed, 238 insertions(+)
>  create mode 100644 drivers/platform/x86/huawei-wmi.c
>
> diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
> index 87f70e8f4dd0..45ef4d22f14c 100644
> --- a/drivers/platform/x86/Kconfig
> +++ b/drivers/platform/x86/Kconfig
> @@ -1292,6 +1292,23 @@ config INTEL_ATOMISP2_PM
>           To compile this driver as a module, choose M here: the module
>           will be called intel_atomisp2_pm.
>
> +config HUAWEI_WMI
> +       tristate "Huawei WMI hotkeys driver"
> +       depends on ACPI_WMI
> +       depends on INPUT
> +       select INPUT_SPARSEKMAP
> +       select LEDS_CLASS
> +       select LEDS_TRIGGERS
> +       select LEDS_TRIGGER_AUDIO
> +       select NEW_LEDS
> +       help
> +         This driver provides support for Huawei WMI hotkeys.
> +         It enables the missing keys and adds support to the micmute
> +         LED found on some of these laptops.
> +
> +         To compile this driver as a module, choose M here: the module
> +         will be called huawei-wmi.
> +
>  endif # X86_PLATFORM_DEVICES
>
>  config PMC_ATOM
> diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
> index 39ae94135406..d841c550e3cc 100644
> --- a/drivers/platform/x86/Makefile
> +++ b/drivers/platform/x86/Makefile
> @@ -32,6 +32,7 @@ obj-$(CONFIG_ACERHDF)         += acerhdf.o
>  obj-$(CONFIG_HP_ACCEL)         += hp_accel.o
>  obj-$(CONFIG_HP_WIRELESS)      += hp-wireless.o
>  obj-$(CONFIG_HP_WMI)           += hp-wmi.o
> +obj-$(CONFIG_HUAWEI_WMI)               += huawei-wmi.o
>  obj-$(CONFIG_AMILO_RFKILL)     += amilo-rfkill.o
>  obj-$(CONFIG_GPD_POCKET_FAN)   += gpd-pocket-fan.o
>  obj-$(CONFIG_TC1100_WMI)       += tc1100-wmi.o
> diff --git a/drivers/platform/x86/huawei-wmi.c b/drivers/platform/x86/huawei-wmi.c
> new file mode 100644
> index 000000000000..89ba7ea33499
> --- /dev/null
> +++ b/drivers/platform/x86/huawei-wmi.c
> @@ -0,0 +1,220 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + *  Huawei WMI hotkeys
> + *
> + *  Copyright (C) 2018       Ayman Bagabas <ayman.bagabas@xxxxxxxxx>
> + */
> +
> +#include <linux/acpi.h>
> +#include <linux/input.h>
> +#include <linux/input/sparse-keymap.h>
> +#include <linux/leds.h>
> +#include <linux/module.h>
> +#include <linux/wmi.h>
> +
> +/*
> + * Huawei WMI GUIDs
> + */
> +#define WMI0_EVENT_GUID "59142400-C6A3-40fa-BADB-8A2652834100"
> +#define AMW0_EVENT_GUID "ABBC0F5C-8EA1-11D1-A000-C90629100000"
> +
> +#define WMI0_EXPENSIVE_GUID "39142400-C6A3-40fa-BADB-8A2652834100"
> +
> +struct huawei_wmi_priv {
> +       struct input_dev *idev;
> +       struct led_classdev cdev;
> +       acpi_handle handle;
> +       char *acpi_method;
> +};
> +
> +static const struct key_entry huawei_wmi_keymap[] = {
> +       { KE_KEY,    0x281, { KEY_BRIGHTNESSDOWN } },
> +       { KE_KEY,    0x282, { KEY_BRIGHTNESSUP } },
> +       { KE_KEY,    0x284, { KEY_MUTE } },
> +       { KE_KEY,    0x285, { KEY_VOLUMEDOWN } },
> +       { KE_KEY,    0x286, { KEY_VOLUMEUP } },
> +       { KE_KEY,    0x287, { KEY_MICMUTE } },
> +       { KE_KEY,    0x289, { KEY_WLAN } },
> +       // Huawei |M| key
> +       { KE_KEY,    0x28a, { KEY_CONFIG } },
> +       // Keyboard backlight
> +       { KE_IGNORE, 0x293, { KEY_KBDILLUMTOGGLE } },
> +       { KE_IGNORE, 0x294, { KEY_KBDILLUMUP } },
> +       { KE_IGNORE, 0x295, { KEY_KBDILLUMUP } },
> +       { KE_END,        0 }
> +};
> +
> +static int huawei_wmi_micmute_led_set(struct led_classdev *led_cdev,
> +               enum led_brightness brightness)
> +{
> +       struct huawei_wmi_priv *priv = dev_get_drvdata(led_cdev->dev->parent);
> +       acpi_status status;
> +       union acpi_object args[3];
> +       struct acpi_object_list arg_list = {
> +               .pointer = args,
> +               .count = ARRAY_SIZE(args),
> +       };
> +
> +       args[0].type = args[1].type = args[2].type = ACPI_TYPE_INTEGER;
> +       args[1].integer.value = 0x04;
> +
> +       if (strcmp(priv->acpi_method, "SPIN") == 0) {
> +               args[0].integer.value = 0;
> +               args[2].integer.value = brightness ? 1 : 0;
> +       } else if (strcmp(priv->acpi_method, "WPIN") == 0) {
> +               args[0].integer.value = 1;
> +               args[2].integer.value = brightness ? 0 : 1;
> +       } else {
> +               return -EINVAL;
> +       }
> +
> +       status = acpi_evaluate_object(priv->handle, priv->acpi_method, &arg_list, NULL);
> +       if (ACPI_FAILURE(status))
> +               return -ENXIO;
> +
> +       return 0;
> +}
> +
> +static int huawei_wmi_leds_setup(struct wmi_device *wdev)
> +{
> +       struct huawei_wmi_priv *priv = dev_get_drvdata(&wdev->dev);
> +       acpi_status status;
> +

> +       /* Skip registering LED subsystem if no ACPI method was found.
> +        * ec_get_handle() returns the first embedded controller device
> +        * handle which then used to locate SPIN and WPIN methods.
> +        */

Comment style is cripple here.
All issues we may fix when applying.

> +       priv->handle = ec_get_handle();
> +       if (!priv->handle)
> +               return 0;
> +
> +       if (acpi_has_method(priv->handle, "SPIN"))
> +               priv->acpi_method = "SPIN";
> +       else if (acpi_has_method(priv->handle, "WPIN"))
> +               priv->acpi_method = "WPIN";
> +       else
> +               return 0;
> +
> +       priv->cdev.name = "platform::micmute";
> +       priv->cdev.max_brightness = 1;
> +       priv->cdev.brightness_set_blocking = huawei_wmi_micmute_led_set;
> +       priv->cdev.default_trigger = "audio-micmute";
> +       priv->cdev.brightness = ledtrig_audio_get(LED_AUDIO_MICMUTE);
> +       priv->cdev.dev = &wdev->dev;
> +       priv->cdev.flags = LED_CORE_SUSPENDRESUME;
> +
> +       return devm_led_classdev_register(&wdev->dev, &priv->cdev);
> +}
> +
> +static void huawei_wmi_process_key(struct wmi_device *wdev, int code)
> +{
> +       struct huawei_wmi_priv *priv = dev_get_drvdata(&wdev->dev);
> +       const struct key_entry *key;
> +
> +       /*
> +        * WMI0 uses code 0x80 to indicate a hotkey event.
> +        * The actual key is fetched from the method WQ00
> +        * using WMI0_EXPENSIVE_GUID.
> +        */
> +       if (code == 0x80) {
> +               struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
> +               union acpi_object *obj;
> +               acpi_status status;
> +
> +               status = wmi_query_block(WMI0_EXPENSIVE_GUID, 0, &response);
> +               if (ACPI_FAILURE(status))
> +                       return;
> +
> +               obj = (union acpi_object *)response.pointer;
> +               if (obj && obj->type == ACPI_TYPE_INTEGER)
> +                       code = obj->integer.value;
> +
> +               kfree(response.pointer);
> +       }
> +
> +       key = sparse_keymap_entry_from_scancode(priv->idev, code);
> +       if (!key) {
> +               dev_info(&wdev->dev, "Unknown key pressed, code: 0x%04x\n", code);
> +               return;
> +       }
> +
> +       sparse_keymap_report_entry(priv->idev, key, 1, true);
> +}
> +
> +static void huawei_wmi_notify(struct wmi_device *wdev,
> +               union acpi_object *obj)
> +{
> +       if (obj->type == ACPI_TYPE_INTEGER)
> +               huawei_wmi_process_key(wdev, obj->integer.value);
> +       else
> +               dev_info(&wdev->dev, "Bad response type %d\n", obj->type);
> +}
> +
> +static int huawei_wmi_input_setup(struct wmi_device *wdev)
> +{
> +       struct huawei_wmi_priv *priv = dev_get_drvdata(&wdev->dev);
> +       int err;
> +
> +       priv->idev = devm_input_allocate_device(&wdev->dev);
> +       if (!priv->idev)
> +               return -ENOMEM;
> +
> +       priv->idev->name = "Huawei WMI hotkeys";
> +       priv->idev->phys = "wmi/input0";
> +       priv->idev->id.bustype = BUS_HOST;
> +       priv->idev->dev.parent = &wdev->dev;
> +
> +       err = sparse_keymap_setup(priv->idev, huawei_wmi_keymap, NULL);
> +       if (err)
> +               return err;
> +

> +       err = input_register_device(priv->idev);
> +       if (err)
> +               return err;
> +
> +       return 0;

return input_register_device(...);

> +}
> +
> +static int huawei_wmi_probe(struct wmi_device *wdev)
> +{
> +       struct huawei_wmi_priv *priv;
> +       int err;
> +
> +       priv = devm_kzalloc(&wdev->dev, sizeof(struct huawei_wmi_priv), GFP_KERNEL);
> +       if (!priv)
> +               return -ENOMEM;

+ blank line.

> +       dev_set_drvdata(&wdev->dev, priv);
> +
> +       err = huawei_wmi_input_setup(wdev);
> +       if (err)
> +               return err;
> +

> +       err = huawei_wmi_leds_setup(wdev);
> +       if (err)
> +               return err;
> +
> +       return 0;

return huawei_wmi_leds_setup(...);

> +}
> +
> +static const struct wmi_device_id huawei_wmi_id_table[] = {
> +       { .guid_string = WMI0_EVENT_GUID },
> +       { .guid_string = AMW0_EVENT_GUID },
> +       {  }
> +};
> +
> +static struct wmi_driver huawei_wmi_driver = {
> +       .driver = {
> +               .name = "huawei-wmi",
> +       },
> +       .id_table = huawei_wmi_id_table,
> +       .probe = huawei_wmi_probe,
> +       .notify = huawei_wmi_notify,
> +};
> +
> +module_wmi_driver(huawei_wmi_driver);
> +
> +MODULE_ALIAS("wmi:"WMI0_EVENT_GUID);
> +MODULE_ALIAS("wmi:"AMW0_EVENT_GUID);
> +MODULE_AUTHOR("Ayman Bagabas <ayman.bagabas@xxxxxxxxx>");
> +MODULE_DESCRIPTION("Huawei WMI hotkeys");
> +MODULE_LICENSE("GPL v2");
> --
> 2.19.2
>


-- 
With Best Regards,
Andy Shevchenko
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