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platform/x86: huawei-wmi: Add fn-lock support

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Huawei Matebook laptops uses Fn key and toggle to access F1-F12 keys.
Along with that, there is this feature called fn-lock that inverts the
behavior of this Fn key and the F1-F12 row.

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 22:48:10 -04:00 committed by Andy Shevchenko
parent 355a070b09
commit 32e59d119d
1 changed files with 85 additions and 0 deletions
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85
drivers/platform/x86/huawei-wmi.c
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@ -54,6 +54,7 @@ static struct quirk_entry *quirks;
struct huawei_wmi {
bool battery_available;
bool fn_lock_available;
struct input_dev *idev[2];
struct led_classdev cdev;
@ -509,6 +510,88 @@ static void huawei_wmi_battery_exit(struct device *dev)
}
}
/* Fn lock */
static int huawei_wmi_fn_lock_get(int *on)
{
u8 ret[0x100] = { 0 };
int err, i;
err = huawei_wmi_cmd(FN_LOCK_GET, ret, 0x100);
if (err)
return err;
/* Find the first non-zero value. Return status is ignored. */
i = 1;
do {
if (on)
*on = ret[i] - 1; // -1 undefined, 0 off, 1 on.
} while (i < 0xff && !ret[i++]);
return 0;
}
static int huawei_wmi_fn_lock_set(int on)
{
union hwmi_arg arg;
arg.cmd = FN_LOCK_SET;
arg.args[2] = on + 1; // 0 undefined, 1 off, 2 on.
return huawei_wmi_cmd(arg.cmd, NULL, 0);
}
static ssize_t fn_lock_state_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
int err, on;
err = huawei_wmi_fn_lock_get(&on);
if (err)
return err;
return sprintf(buf, "%d\n", on);
}
static ssize_t fn_lock_state_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t size)
{
int on, err;
if (kstrtoint(buf, 10, &on) ||
on < 0 || on > 1)
return -EINVAL;
err = huawei_wmi_fn_lock_set(on);
if (err)
return err;
return size;
}
static DEVICE_ATTR_RW(fn_lock_state);
static void huawei_wmi_fn_lock_setup(struct device *dev)
{
struct huawei_wmi *huawei = dev_get_drvdata(dev);
huawei->fn_lock_available = true;
if (huawei_wmi_fn_lock_get(NULL)) {
huawei->fn_lock_available = false;
return;
}
device_create_file(dev, &dev_attr_fn_lock_state);
}
static void huawei_wmi_fn_lock_exit(struct device *dev)
{
if (huawei_wmi->fn_lock_available)
device_remove_file(dev, &dev_attr_fn_lock_state);
}
/* Input */
static void huawei_wmi_process_key(struct input_dev *idev, int code)
@ -632,6 +715,7 @@ static int huawei_wmi_probe(struct platform_device *pdev)
mutex_init(&huawei_wmi->battery_lock);
huawei_wmi_leds_setup(&pdev->dev);
huawei_wmi_fn_lock_setup(&pdev->dev);
huawei_wmi_battery_setup(&pdev->dev);
}
@ -651,6 +735,7 @@ static int huawei_wmi_remove(struct platform_device *pdev)
if (wmi_has_guid(HWMI_METHOD_GUID)) {
huawei_wmi_battery_exit(&pdev->dev);
huawei_wmi_fn_lock_exit(&pdev->dev);
}
return 0;