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SubjectRe: [RFC] iio: light: acpi-als: Enable the light sensor on the Zenbook UX430UQ
2017-11-19 18:03 GMT+01:00 Jonathan Cameron <jic23@kernel.org>:
> On Wed, 15 Nov 2017 20:27:54 -0700
> Kiernan Hager <kah.listaddress@gmail.com> wrote:
>
>> This makes acpi-als properly enable the light sensor on the Zenbook UX430UQ. I don't know if the checking that I do to make sure that the ACPI method exists is sufficient or if it should disable the sensor when the module is unloaded, so input is appreciated on those matters.
>
> Please wrap descriptions to around 72 characters (leaves room for indentation
> in the email thread :)
>
> This seems very much like a board specific hack. I've cc'd people
> who have worked on the driver recently and the acpi list.

This is indeed board specific. I know many other laptops of the
Zenbook line need something similar and if you look at
drivers/platform/x86/asus-wmi.c or any other asus-* driver you'll
find several quirks to enable various features.

Kiernan, check commit aca234f6378864d85514be558746c0ea6eabfa8e
("asus-wmi: provide access to ALS control") in particular.

>>
>> Signed-off-by: Kiernan Hager <kah.listaddress@gmail.com>
>> ---
>> drivers/iio/light/acpi-als.c | 16 ++++++++++++++++
>> 1 file changed, 16 insertions(+)
>>
>> diff --git a/drivers/iio/light/acpi-als.c b/drivers/iio/light/acpi-als.c
>> index c35e2f8df339..8fd66166f19f 100644
>> --- a/drivers/iio/light/acpi-als.c
>> +++ b/drivers/iio/light/acpi-als.c
>> @@ -179,6 +179,10 @@ static int acpi_als_add(struct acpi_device *device)
>> struct acpi_als *als;
>> struct iio_dev *indio_dev;
>> struct iio_buffer *buffer;
>> + unsigned long long temp_val;
>> + acpi_status status;
>> + struct acpi_object_list arg_list;
>> + union acpi_object arg;
>>
>> indio_dev = devm_iio_device_alloc(&device->dev, sizeof(*als));
>> if (!indio_dev)
>> @@ -203,6 +207,18 @@ static int acpi_als_add(struct acpi_device *device)
>>
>> iio_device_attach_buffer(indio_dev, buffer);
>>
>> + arg_list.count = 1;
>> + arg_list.pointer = &arg;
>> + arg.type = ACPI_TYPE_INTEGER;
>> + arg.integer.value = 1;
>> +
>> + if (acpi_has_method(als->device->handle, "\\_SB.PCI0.LPCB.EC0.ALSC")) {
> So this is poking something on
> PCI bus 0
> LPC bus B
> Somethingbus 0
> Ambient light controller.
>
> I assume there is a better way of establishing this needs to be set?
>
>> + status = acpi_evaluate_integer(als->device->handle,
>> + "\\_SB.PCI0.LPCB.EC0.ALSC",
>> + &arg_list,
>> + &temp_val);
>> + }
>> +
>> return devm_iio_device_register(&device->dev, indio_dev);
>> }
>>
>

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