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Subject[PATCH v2 1/8] platform/x86: huawei-wmi: move to platform driver
Date
This move is necessary because the driver is no longer only a hotkeys
driver and platform_driver offers easier future extensibility. Along
with that, some renames have been made to identify the WMI device in ASL
code. AMW0 -> HWMI which is the UID of this WMI device found on
supported laptops. WMI0 is the device name and has no UID, therefore,
left as it is.

Signed-off-by: Ayman Bagabas <ayman.bagabas@gmail.com>
---
drivers/platform/x86/huawei-wmi.c | 231 ++++++++++++++++++++----------
1 file changed, 154 insertions(+), 77 deletions(-)

diff --git a/drivers/platform/x86/huawei-wmi.c b/drivers/platform/x86/huawei-wmi.c
index 52fcac5b393a..4a9e14d3b705 100644
--- a/drivers/platform/x86/huawei-wmi.c
+++ b/drivers/platform/x86/huawei-wmi.c
@@ -1,6 +1,6 @@
// SPDX-License-Identifier: GPL-2.0
/*
- * Huawei WMI hotkeys
+ * Huawei WMI laptop extras driver
*
* Copyright (C) 2018 Ayman Bagabas <ayman.bagabas@gmail.com>
*/
@@ -10,23 +10,27 @@
#include <linux/input/sparse-keymap.h>
#include <linux/leds.h>
#include <linux/module.h>
+#include <linux/platform_device.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 HWMI_EVENT_GUID "ABBC0F5C-8EA1-11D1-A000-C90629100000"

+/* Legacy GUIDs */
#define WMI0_EXPENSIVE_GUID "39142400-C6A3-40fa-BADB-8A2652834100"
+#define WMI0_EVENT_GUID "59142400-C6A3-40fa-BADB-8A2652834100"

-struct huawei_wmi_priv {
- struct input_dev *idev;
+
+struct huawei_wmi {
struct led_classdev cdev;
- acpi_handle handle;
- char *acpi_method;
+ struct input_dev *idev[2];
+ struct platform_device *pdev;
};

+struct platform_device *huawei_wmi_pdev;
+
static const struct key_entry huawei_wmi_keymap[] = {
{ KE_KEY, 0x281, { KEY_BRIGHTNESSDOWN } },
{ KE_KEY, 0x282, { KEY_BRIGHTNESSUP } },
@@ -37,17 +41,20 @@ static const struct key_entry huawei_wmi_keymap[] = {
{ KE_KEY, 0x289, { KEY_WLAN } },
// Huawei |M| key
{ KE_KEY, 0x28a, { KEY_CONFIG } },
- // Keyboard backlight
+ // Keyboard backlit
{ KE_IGNORE, 0x293, { KEY_KBDILLUMTOGGLE } },
{ KE_IGNORE, 0x294, { KEY_KBDILLUMUP } },
{ KE_IGNORE, 0x295, { KEY_KBDILLUMUP } },
{ KE_END, 0 }
};

+/* LEDs */
+
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);
+ char *acpi_method;
+ acpi_handle handle;
acpi_status status;
union acpi_object args[3];
struct acpi_object_list arg_list = {
@@ -55,55 +62,54 @@ static int huawei_wmi_micmute_led_set(struct led_classdev *led_cdev,
.count = ARRAY_SIZE(args),
};

+ handle = ec_get_handle();
+ if (!handle) {
+ dev_err(led_cdev->dev->parent, "Failed to get EC handle\n");
+ return -ENODEV;
+ }
+
args[0].type = args[1].type = args[2].type = ACPI_TYPE_INTEGER;
args[1].integer.value = 0x04;

- if (strcmp(priv->acpi_method, "SPIN") == 0) {
+ if (acpi_has_method(handle, "SPIN")) {
+ acpi_method = "SPIN";
args[0].integer.value = 0;
args[2].integer.value = brightness ? 1 : 0;
- } else if (strcmp(priv->acpi_method, "WPIN") == 0) {
+ } else if (acpi_has_method(handle, "WPIN")) {
+ acpi_method = "WPIN";
args[0].integer.value = 1;
args[2].integer.value = brightness ? 0 : 1;
} else {
- return -EINVAL;
+ return -ENODEV;
}

- status = acpi_evaluate_object(priv->handle, priv->acpi_method, &arg_list, NULL);
- if (ACPI_FAILURE(status))
- return -ENXIO;
+ status = acpi_evaluate_object(handle, acpi_method, &arg_list, NULL);
+ if (ACPI_FAILURE(status)) {
+ return -ENODEV;
+ }

return 0;
}

-static int huawei_wmi_leds_setup(struct wmi_device *wdev)
+static int huawei_wmi_leds_setup(struct device *dev)
{
- struct huawei_wmi_priv *priv = dev_get_drvdata(&wdev->dev);
+ struct huawei_wmi *huawei = dev_get_drvdata(dev);

- priv->handle = ec_get_handle();
- if (!priv->handle)
- return 0;
+ huawei->cdev.name = "platform::micmute";
+ huawei->cdev.max_brightness = 1;
+ huawei->cdev.brightness_set_blocking = huawei_wmi_micmute_led_set;
+ huawei->cdev.default_trigger = "audio-micmute";
+ huawei->cdev.brightness = ledtrig_audio_get(LED_AUDIO_MICMUTE);
+ huawei->cdev.dev = dev->parent;
+ huawei->cdev.flags = LED_CORE_SUSPENDRESUME;

- 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);
+ return devm_led_classdev_register(dev, &huawei->cdev);
}

-static void huawei_wmi_process_key(struct wmi_device *wdev, int code)
+/* Input */
+
+static void huawei_wmi_process_key(struct input_dev *idev, int code)
{
- struct huawei_wmi_priv *priv = dev_get_drvdata(&wdev->dev);
const struct key_entry *key;

/*
@@ -117,8 +123,10 @@ static void huawei_wmi_process_key(struct wmi_device *wdev, int code)
acpi_status status;

status = wmi_query_block(WMI0_EXPENSIVE_GUID, 0, &response);
- if (ACPI_FAILURE(status))
+ if (ACPI_FAILURE(status)) {
+ dev_err(&idev->dev, "Failed to query wmi block\n");
return;
+ }

obj = (union acpi_object *)response.pointer;
if (obj && obj->type == ACPI_TYPE_INTEGER)
@@ -127,81 +135,150 @@ static void huawei_wmi_process_key(struct wmi_device *wdev, int code)
kfree(response.pointer);
}

- key = sparse_keymap_entry_from_scancode(priv->idev, code);
+ key = sparse_keymap_entry_from_scancode(idev, code);
if (!key) {
- dev_info(&wdev->dev, "Unknown key pressed, code: 0x%04x\n", code);
+ dev_info(&idev->dev, "Unknown key pressed, code: 0x%04x\n", code);
return;
}

- sparse_keymap_report_entry(priv->idev, key, 1, true);
+ sparse_keymap_report_entry(idev, key, 1, true);
}

-static void huawei_wmi_notify(struct wmi_device *wdev,
- union acpi_object *obj)
+static void huawei_wmi_input_notify(u32 value, void *context)
{
- if (obj->type == ACPI_TYPE_INTEGER)
- huawei_wmi_process_key(wdev, obj->integer.value);
+ struct input_dev *idev = (struct input_dev *)context;
+ struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
+ union acpi_object *obj;
+ acpi_status status;
+
+ status = wmi_get_event_data(value, &response);
+ if (ACPI_FAILURE(status)) {
+ dev_err(&idev->dev, "Unable to get event data\n");
+ return;
+ }
+
+ obj = (union acpi_object *)response.pointer;
+ if (obj && obj->type == ACPI_TYPE_INTEGER)
+ huawei_wmi_process_key(idev, obj->integer.value);
else
- dev_info(&wdev->dev, "Bad response type %d\n", obj->type);
+ dev_err(&idev->dev, "Bad response type\n");
+
+ kfree(response.pointer);
}

-static int huawei_wmi_input_setup(struct wmi_device *wdev)
+static int huawei_wmi_input_setup(struct platform_device *pdev,
+ struct input_dev **idev)
{
- struct huawei_wmi_priv *priv = dev_get_drvdata(&wdev->dev);
int err;

- priv->idev = devm_input_allocate_device(&wdev->dev);
- if (!priv->idev)
+ *idev = devm_input_allocate_device(&pdev->dev);
+ if (!*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;
+ (*idev)->name = "Huawei WMI hotkeys";
+ (*idev)->phys = "wmi/input0";
+ (*idev)->id.bustype = BUS_HOST;
+ (*idev)->dev.parent = &pdev->dev;

- err = sparse_keymap_setup(priv->idev, huawei_wmi_keymap, NULL);
+ err = sparse_keymap_setup(*idev, huawei_wmi_keymap, NULL);
if (err)
return err;

- return input_register_device(priv->idev);
+ return input_register_device(*idev);
}

-static int huawei_wmi_probe(struct wmi_device *wdev)
+/* Huawei driver */
+
+static int huawei_wmi_probe(struct platform_device *pdev)
{
- struct huawei_wmi_priv *priv;
+ struct huawei_wmi *huawei;
int err;

- priv = devm_kzalloc(&wdev->dev, sizeof(struct huawei_wmi_priv), GFP_KERNEL);
- if (!priv)
+ huawei = devm_kzalloc(&pdev->dev, sizeof(struct huawei_wmi), GFP_KERNEL);
+ if (!huawei)
return -ENOMEM;

- dev_set_drvdata(&wdev->dev, priv);
+ huawei->pdev = pdev;
+ dev_set_drvdata(&pdev->dev, huawei);
+
+ if (wmi_has_guid(WMI0_EVENT_GUID)) {
+ err = huawei_wmi_input_setup(pdev, &huawei->idev[0]);
+ if (err)
+ dev_err(&pdev->dev, "Failed to setup input device\n");
+ err = wmi_install_notify_handler(WMI0_EVENT_GUID,
+ huawei_wmi_input_notify, huawei->idev[0]);
+ if (err)
+ dev_err(&pdev->dev, "Failed to install notify handler\n");
+ }

- err = huawei_wmi_input_setup(wdev);
- if (err)
- return err;
+ if (wmi_has_guid(HWMI_EVENT_GUID)) {
+ err = huawei_wmi_input_setup(pdev, &huawei->idev[1]);
+ if (err)
+ dev_err(&pdev->dev, "Failed to setup input device\n");
+ err = wmi_install_notify_handler(HWMI_EVENT_GUID,
+ huawei_wmi_input_notify, huawei->idev[1]);
+ if (err)
+ dev_err(&pdev->dev, "Failed to install notify handler\n");
+ }

- return huawei_wmi_leds_setup(wdev);
+ if (wmi_has_guid(HWMI_METHOD_GUID)) {
+ err = huawei_wmi_leds_setup(&pdev->dev);
+ if (err)
+ dev_err(&pdev->dev, "Failed to setup leds\n");
+ }
+ return 0;
}

-static const struct wmi_device_id huawei_wmi_id_table[] = {
- { .guid_string = WMI0_EVENT_GUID },
- { .guid_string = AMW0_EVENT_GUID },
- { }
-};
+static int huawei_wmi_remove(struct platform_device *pdev)
+{
+ if (wmi_has_guid(WMI0_EVENT_GUID))
+ wmi_remove_notify_handler(WMI0_EVENT_GUID);

-static struct wmi_driver huawei_wmi_driver = {
+ if (wmi_has_guid(HWMI_EVENT_GUID))
+ wmi_remove_notify_handler(HWMI_EVENT_GUID);
+
+ return 0;
+}
+
+static struct platform_driver huawei_wmi_driver = {
.driver = {
.name = "huawei-wmi",
},
- .id_table = huawei_wmi_id_table,
.probe = huawei_wmi_probe,
- .notify = huawei_wmi_notify,
+ .remove = huawei_wmi_remove,
};

-module_wmi_driver(huawei_wmi_driver);
+static __init int huawei_wmi_init(void)
+{
+ int err;
+
+ err = platform_driver_register(&huawei_wmi_driver);
+ if (err) {
+ pr_err("Failed to register platform driver\n");
+ return err;
+ }
+
+ huawei_wmi_pdev = platform_device_register_simple("huawei-wmi", -1, NULL, 0);
+ if (IS_ERR(huawei_wmi_pdev)) {
+ pr_err("Failed to register platform device\n");
+ platform_driver_unregister(&huawei_wmi_driver);
+ return PTR_ERR(huawei_wmi_pdev);
+ }
+
+ return 0;
+}
+
+static __exit void huawei_wmi_exit(void)
+{
+ platform_device_unregister(huawei_wmi_pdev);
+ platform_driver_unregister(&huawei_wmi_driver);
+}
+
+module_init(huawei_wmi_init);
+module_exit(huawei_wmi_exit);

-MODULE_DEVICE_TABLE(wmi, huawei_wmi_id_table);
+MODULE_ALIAS("wmi:"WMI0_EVENT_GUID);
+MODULE_ALIAS("wmi:"HWMI_EVENT_GUID);
MODULE_AUTHOR("Ayman Bagabas <ayman.bagabas@gmail.com>");
-MODULE_DESCRIPTION("Huawei WMI hotkeys");
+MODULE_DESCRIPTION("Huawei WMI laptop extras driver");
MODULE_LICENSE("GPL v2");
--
2.20.1
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