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platform/x86: huawei-wmi: Implement huawei wmi management 

Huawei Matebook laptops come with a WMI management interface that can
control various aspects of the device. This interface is also found on
the old Matebook X released in 2017.

Use that to control the mic mute LED.

Signed-off-by: Ayman Bagabas <ayman.bagabas@gmail.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
This commit is contained in:
Ayman Bagabas 2019-09-23 22:48:08 -04:00 committed by Andy Shevchenko
parent 8a480c108f
commit 090ddd770b
1 changed files with 179 additions and 36 deletions
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215
drivers/platform/x86/huawei-wmi.c
View File

@ -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;
@ -110,52 +127,168 @@ 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);
acpi_status status;
union acpi_object args[3];
struct acpi_object_list arg_list = {
.pointer = args,
.count = ARRAY_SIZE(args),
};
/* 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 = {
.pointer = args,
.count = ARRAY_SIZE(args),
};
args[0].type = args[1].type = args[2].type = ACPI_TYPE_INTEGER;
args[1].integer.value = 0x04;
handle = ec_get_handle();
if (!handle)
return -ENODEV;
if (strcmp(huawei->acpi_method, "SPIN") == 0) {
args[0].integer.value = 0;
args[2].integer.value = brightness ? 1 : 0;
} else if (strcmp(huawei->acpi_method, "WPIN") == 0) {
args[0].integer.value = 1;
args[2].integer.value = brightness ? 0 : 1;
args[0].type = args[1].type = args[2].type = ACPI_TYPE_INTEGER;
args[1].integer.value = 0x04;
if (acpi_has_method(handle, "SPIN")) {
acpi_method = "SPIN";
args[0].integer.value = 0;
args[2].integer.value = brightness ? 1 : 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 -ENODEV;
}
status = acpi_evaluate_object(handle, acpi_method, &arg_list, NULL);
if (ACPI_FAILURE(status))
return -ENODEV;
return 0;
} else {
return -EINVAL;
union hwmi_arg arg;
arg.cmd = MICMUTE_LED_SET;
arg.args[2] = brightness;
return huawei_wmi_cmd(arg.cmd, NULL, 0);
}
status = acpi_evaluate_object(huawei->handle, huawei->acpi_method, &arg_list, NULL);
if (ACPI_FAILURE(status))
return -ENXIO;
return 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++;
}
huawei_wmi_leds_setup(&pdev->dev);
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");