ASUS Zenbooks need several special ACPI calls to enable the ALS peripheral.
Otherwise, reads just return 0.
Signed-off-by: Josef Gajdusek <a...@atx.name>
---
drivers/iio/light/acpi-als.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/drivers/iio/light/acpi-als.c b/drivers/iio/light/acpi-als.c
index f0b47c5..ccd5787 100644
--- a/drivers/iio/light/acpi-als.c
+++ b/drivers/iio/light/acpi-als.c
@@ -39,6 +39,9 @@
#define ACPI_ALS_DEVICE_NAME "acpi-als"
#define ACPI_ALS_NOTIFY_ILLUMINANCE 0x80
+#define ACPI_ALS_ASUS_TALS "\\_SB.PCI0.LPCB.EC0.TALS"
+#define ACPI_ALS_ASUS_ALSC "\\_SB.ATKD.ALSC"
+
ACPI_MODULE_NAME("acpi-als");
/*
@@ -170,6 +173,16 @@ static int acpi_als_read_raw(struct iio_dev *indio_dev,
return IIO_VAL_INT;
}
+static void acpi_als_quirk_asus(struct acpi_als *als)
+{
+ acpi_execute_simple_method(NULL, ACPI_ALS_ASUS_TALS, 1);
+ acpi_execute_simple_method(NULL, ACPI_ALS_ASUS_ALSC, 1);
+}
+
+static void (*acpi_als_quirks[])(struct acpi_als *als) = {
+ acpi_als_quirk_asus,
+};
+
static const struct iio_info acpi_als_info = {
.driver_module = THIS_MODULE,
.read_raw = acpi_als_read_raw,
@@ -180,6 +193,7 @@ static int acpi_als_add(struct acpi_device *device)
struct acpi_als *als;
struct iio_dev *indio_dev;
struct iio_buffer *buffer;
+ int i;
indio_dev = devm_iio_device_alloc(&device->dev, sizeof(*als));
if (!indio_dev)
@@ -191,6 +205,9 @@ static int acpi_als_add(struct acpi_device *device)
als->device = device;
mutex_init(&als->lock);
+ for (i = 0; i < ARRAY_SIZE(acpi_als_quirks); i++)
+ acpi_als_quirks[i](als);
+
indio_dev->name = ACPI_ALS_DEVICE_NAME;
indio_dev->dev.parent = &device->dev;
indio_dev->info = &acpi_als_info;
--
2.10.2
