linux-kernel - Re: [PATCH v2] iio: light: acpi-als: Properly enable on ASUS Zenbooks

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Message-ID: <7b7f6d47-a0cc-8af5-c68f-da4350d793aa@denx.de>
Date:   Thu, 19 Jan 2017 15:48:12 +0100
From:   Marek Vasut <marex@...x.de>
To:     Josef Gajdusek <atx@....name>, linux-iio@...r.kernel.org
Cc:     jic23@...nel.org, knaack.h@....de, lars@...afoo.de,
        pmeerw@...erw.net, maitysanchayan@...il.com,
        gregor.boirie@...rot.com, linux-kernel@...r.kernel.org,
        rui.zhang@...el.com, marxin.liska@...il.com
Subject: Re: [PATCH v2] iio: light: acpi-als: Properly enable on ASUS Zenbooks

On 01/19/2017 12:48 PM, Josef Gajdusek wrote:
> ASUS Zenbooks need several special ACPI calls to enable the ALS peripheral.
> Otherwise, reads just return 0.
> 
> Signed-off-by: Josef Gajdusek <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);

This will run on ALL systems, right ? Also, error checking disappeared ?

> +}
> +
> +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;
> 


-- 
Best regards,
Marek Vasut