platform/x86: huawei-wmi: Implement huawei wmi management (090ddd77) · Commits · 戴 / test

drivers/platform/x86/huawei-wmi.c

+180 −37

Original line number	Diff line number	Diff line
		@@ -11,18 +11,35 @@
		#include <linux/input/sparse-keymap.h>
		#include <linux/leds.h>
		#include <linux/module.h>
		#include <linux/mutex.h>
		#include <linux/platform_device.h>
		#include <linux/wmi.h>

		/*
		* Huawei WMI GUIDs
		*/
		#define HWMI_METHOD_GUID "ABBC0F5B-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"

		/* HWMI commands */

		enum {
		BATTERY_THRESH_GET = 0x00001103, /* \GBTT */
		BATTERY_THRESH_SET = 0x00001003, /* \SBTT */
		FN_LOCK_GET = 0x00000604, /* \GFRS */
		FN_LOCK_SET = 0x00000704, /* \SFRS */
		MICMUTE_LED_SET = 0x00000b04, /* \SMLS */
		};

		union hwmi_arg {
		u64 cmd;
		u8 args[8];
		};

		struct quirk_entry {
		bool battery_reset;
		bool ec_micmute;
		@@ -35,8 +52,8 @@ struct huawei_wmi {
		struct input_dev *idev[2];
		struct led_classdev cdev;
		struct platform_device *pdev;
		acpi_handle handle;
		char *acpi_method;

		struct mutex wmi_lock;
		};

		struct huawei_wmi *huawei_wmi;
		@@ -110,10 +127,123 @@ static const struct dmi_system_id huawei_quirks[] = {
		{ }
		};

		/* Utils */

		static int huawei_wmi_call(struct acpi_buffer in, struct acpi_buffer out)
		{
		acpi_status status;

		mutex_lock(&huawei_wmi->wmi_lock);
		status = wmi_evaluate_method(HWMI_METHOD_GUID, 0, 1, in, out);
		mutex_unlock(&huawei_wmi->wmi_lock);
		if (ACPI_FAILURE(status)) {
		dev_err(&huawei_wmi->pdev->dev, "Failed to evaluate wmi method\n");
		return -ENODEV;
		}

		return 0;
		}

		/* HWMI takes a 64 bit input and returns either a package with 2 buffers, one of
		* 4 bytes and the other of 256 bytes, or one buffer of size 0x104 (260) bytes.
		* The first 4 bytes are ignored, we ignore the first 4 bytes buffer if we got a
		* package, or skip the first 4 if a buffer of 0x104 is used. The first byte of
		* the remaining 0x100 sized buffer has the return status of every call. In case
		* the return status is non-zero, we return -ENODEV but still copy the returned
		* buffer to the given buffer parameter (buf).
		*/
		static int huawei_wmi_cmd(u64 arg, u8 *buf, size_t buflen)
		{
		struct acpi_buffer out = { ACPI_ALLOCATE_BUFFER, NULL };
		struct acpi_buffer in;
		union acpi_object *obj;
		size_t len;
		int err, i;

		in.length = sizeof(arg);
		in.pointer = &arg;

		/* Some models require calling HWMI twice to execute a command. We evaluate
		* HWMI and if we get a non-zero return status we evaluate it again.
		*/
		for (i = 0; i < 2; i++) {
		err = huawei_wmi_call(&in, &out);
		if (err)
		goto fail_cmd;

		obj = out.pointer;
		if (!obj) {
		err = -EIO;
		goto fail_cmd;
		}

		switch (obj->type) {
		/* Models that implement both "legacy" and HWMI tend to return a 0x104
		* sized buffer instead of a package of 0x4 and 0x100 buffers.
		*/
		case ACPI_TYPE_BUFFER:
		if (obj->buffer.length == 0x104) {
		// Skip the first 4 bytes.
		obj->buffer.pointer += 4;
		len = 0x100;
		} else {
		dev_err(&huawei_wmi->pdev->dev, "Bad buffer length, got %d\n", obj->buffer.length);
		err = -EIO;
		goto fail_cmd;
		}

		break;
		/* HWMI returns a package with 2 buffer elements, one of 4 bytes and the
		* other is 256 bytes.
		*/
		case ACPI_TYPE_PACKAGE:
		if (obj->package.count != 2) {
		dev_err(&huawei_wmi->pdev->dev, "Bad package count, got %d\n", obj->package.count);
		err = -EIO;
		goto fail_cmd;
		}

		obj = &obj->package.elements[1];
		if (obj->type != ACPI_TYPE_BUFFER) {
		dev_err(&huawei_wmi->pdev->dev, "Bad package element type, got %d\n", obj->type);
		err = -EIO;
		goto fail_cmd;
		}
		len = obj->buffer.length;

		break;
		/* Shouldn't get here! */
		default:
		dev_err(&huawei_wmi->pdev->dev, "Unexpected obj type, got: %d\n", obj->type);
		err = -EIO;
		goto fail_cmd;
		}

		if (!*obj->buffer.pointer)
		break;
		}

		err = (*obj->buffer.pointer) ? -ENODEV : 0;

		if (buf) {
		len = min(buflen, len);
		memcpy(buf, obj->buffer.pointer, len);
		}

		fail_cmd:
		kfree(out.pointer);
		return err;
		}

		/* LEDs */

		static int huawei_wmi_micmute_led_set(struct led_classdev *led_cdev,
		enum led_brightness brightness)
		{
		struct huawei_wmi *huawei = dev_get_drvdata(led_cdev->dev->parent);
		/* This is a workaround until the "legacy" interface is implemented. */
		if (quirks && quirks->ec_micmute) {
		char *acpi_method;
		acpi_handle handle;
		acpi_status status;
		union acpi_object args[3];
		struct acpi_object_list arg_list = {
		@@ -121,41 +251,44 @@ static int huawei_wmi_micmute_led_set(struct led_classdev *led_cdev,
		.count = ARRAY_SIZE(args),
		};

		handle = ec_get_handle();
		if (!handle)
		return -ENODEV;

		args[0].type = args[1].type = args[2].type = ACPI_TYPE_INTEGER;
		args[1].integer.value = 0x04;

		if (strcmp(huawei->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(huawei->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(huawei->handle, huawei->acpi_method, &arg_list, NULL);
		status = acpi_evaluate_object(handle, acpi_method, &arg_list, NULL);
		if (ACPI_FAILURE(status))
		return -ENXIO;
		return -ENODEV;

		return 0;
		} else {
		union hwmi_arg arg;

		arg.cmd = MICMUTE_LED_SET;
		arg.args[2] = brightness;

		return huawei_wmi_cmd(arg.cmd, NULL, 0);
		}
		}

		static void huawei_wmi_leds_setup(struct device *dev)
		{
		struct huawei_wmi *huawei = dev_get_drvdata(dev);

		huawei->handle = ec_get_handle();
		if (!huawei->handle)
		return;

		if (acpi_has_method(huawei->handle, "SPIN"))
		huawei->acpi_method = "SPIN";
		else if (acpi_has_method(huawei->handle, "WPIN"))
		huawei->acpi_method = "WPIN";
		else
		return;

		huawei->cdev.name = "platform::micmute";
		huawei->cdev.max_brightness = 1;
		huawei->cdev.brightness_set_blocking = &huawei_wmi_micmute_led_set;
		@@ -258,6 +391,7 @@ static void huawei_wmi_input_exit(struct device dev, const char guid)

		static const struct wmi_device_id huawei_wmi_events_id_table[] = {
		{ .guid_string = WMI0_EVENT_GUID },
		{ .guid_string = HWMI_EVENT_GUID },
		{ }
		};

		@@ -284,7 +418,12 @@ static int huawei_wmi_probe(struct platform_device *pdev)
		guid++;
		}

		if (wmi_has_guid(HWMI_METHOD_GUID)) {
		mutex_init(&huawei_wmi->wmi_lock);

		huawei_wmi_leds_setup(&pdev->dev);
		}

		return 0;
		}

		@@ -299,6 +438,9 @@ static int huawei_wmi_remove(struct platform_device *pdev)
		guid++;
		}

		if (wmi_has_guid(HWMI_METHOD_GUID)) {
		}

		return 0;
		}

		@@ -354,6 +496,7 @@ static __exit void huawei_wmi_exit(void)
		module_init(huawei_wmi_init);
		module_exit(huawei_wmi_exit);

		MODULE_ALIAS("wmi:"HWMI_METHOD_GUID);
		MODULE_DEVICE_TABLE(wmi, huawei_wmi_events_id_table);
		MODULE_AUTHOR("Ayman Bagabas <ayman.bagabas@gmail.com>");
		MODULE_DESCRIPTION("Huawei WMI laptop extras driver");

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