[v2,1/7] acpi: utils: move acpi_lpss_dep() to utils

I need to be able to identify devices which declare themselves to be
dependent on other devices through _DEP; add this function to utils.c
and export it to the rest of the ACPI layer.

Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Daniel Scally <djrscally@gmail.com>
---
Changes in v2:
	- Introduced

 drivers/acpi/acpi_lpss.c | 24 ------------------------
 drivers/acpi/internal.h  |  1 +
 drivers/acpi/utils.c     | 24 ++++++++++++++++++++++++
 3 files changed, 25 insertions(+), 24 deletions(-)

Hi Daniel,

Thank you for the patch.

On Mon, Jan 18, 2021 at 12:34:22AM +0000, Daniel Scally wrote:
> I need to be able to identify devices which declare themselves to be
> dependent on other devices through _DEP; add this function to utils.c
> and export it to the rest of the ACPI layer.
> 
> Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> Signed-off-by: Daniel Scally <djrscally@gmail.com>
> ---
> Changes in v2:
> 	- Introduced
> 
>  drivers/acpi/acpi_lpss.c | 24 ------------------------
>  drivers/acpi/internal.h  |  1 +
>  drivers/acpi/utils.c     | 24 ++++++++++++++++++++++++
>  3 files changed, 25 insertions(+), 24 deletions(-)
> 
> diff --git a/drivers/acpi/acpi_lpss.c b/drivers/acpi/acpi_lpss.c
> index be73974ce449..70c7d9a3f715 100644
> --- a/drivers/acpi/acpi_lpss.c
> +++ b/drivers/acpi/acpi_lpss.c
> @@ -543,30 +543,6 @@ static struct device *acpi_lpss_find_device(const char *hid, const char *uid)
>  	return bus_find_device(&pci_bus_type, NULL, &data, match_hid_uid);
>  }
>  
> -static bool acpi_lpss_dep(struct acpi_device *adev, acpi_handle handle)
> -{
> -	struct acpi_handle_list dep_devices;
> -	acpi_status status;
> -	int i;
> -
> -	if (!acpi_has_method(adev->handle, "_DEP"))
> -		return false;
> -
> -	status = acpi_evaluate_reference(adev->handle, "_DEP", NULL,
> -					 &dep_devices);
> -	if (ACPI_FAILURE(status)) {
> -		dev_dbg(&adev->dev, "Failed to evaluate _DEP.\n");
> -		return false;
> -	}
> -
> -	for (i = 0; i < dep_devices.count; i++) {
> -		if (dep_devices.handles[i] == handle)
> -			return true;
> -	}
> -
> -	return false;
> -}
> -
>  static void acpi_lpss_link_consumer(struct device *dev1,
>  				    const struct lpss_device_links *link)
>  {
> diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
> index cb229e24c563..ee62c0973576 100644
> --- a/drivers/acpi/internal.h
> +++ b/drivers/acpi/internal.h
> @@ -79,6 +79,7 @@ static inline void acpi_lpss_init(void) {}
>  #endif
>  
>  void acpi_apd_init(void);
> +bool acpi_lpss_dep(struct acpi_device *adev, acpi_handle handle);

"lpss" stands for low power subsystem, an Intel device within the PCH
that handles I2C, SPI, UART, ... I think the function should be renamed,
as it's now generic. acpi_dev_has_dep() is a potential candidate, I'm
sure better ones exist. A bit of kerneldoc would also not hurt.

>  
>  acpi_status acpi_hotplug_schedule(struct acpi_device *adev, u32 src);
>  bool acpi_queue_hotplug_work(struct work_struct *work);
> diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c
> index ddca1550cce6..78b38775f18b 100644
> --- a/drivers/acpi/utils.c
> +++ b/drivers/acpi/utils.c
> @@ -807,6 +807,30 @@ static int acpi_dev_match_cb(struct device *dev, const void *data)
>  	return hrv == match->hrv;
>  }
>  
> +bool acpi_lpss_dep(struct acpi_device *adev, acpi_handle handle)
> +{
> +	struct acpi_handle_list dep_devices;
> +	acpi_status status;
> +	int i;
> +
> +	if (!acpi_has_method(adev->handle, "_DEP"))
> +		return false;
> +
> +	status = acpi_evaluate_reference(adev->handle, "_DEP", NULL,
> +					 &dep_devices);
> +	if (ACPI_FAILURE(status)) {
> +		dev_dbg(&adev->dev, "Failed to evaluate _DEP.\n");
> +		return false;
> +	}
> +
> +	for (i = 0; i < dep_devices.count; i++) {
> +		if (dep_devices.handles[i] == handle)
> +			return true;
> +	}
> +
> +	return false;
> +}
> +
>  /**
>   * acpi_dev_present - Detect that a given ACPI device is present
>   * @hid: Hardware ID of the device.

Hi Laurent

On 18/01/2021 07:24, Laurent Pinchart wrote:
> Hi Daniel,
>
> Thank you for the patch.
>
> On Mon, Jan 18, 2021 at 12:34:22AM +0000, Daniel Scally wrote:
>> I need to be able to identify devices which declare themselves to be
>> dependent on other devices through _DEP; add this function to utils.c
>> and export it to the rest of the ACPI layer.
>>
>> Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
>> Signed-off-by: Daniel Scally <djrscally@gmail.com>
>> ---
>> Changes in v2:
>> 	- Introduced
>>
>>  drivers/acpi/acpi_lpss.c | 24 ------------------------
>>  drivers/acpi/internal.h  |  1 +
>>  drivers/acpi/utils.c     | 24 ++++++++++++++++++++++++
>>  3 files changed, 25 insertions(+), 24 deletions(-)
>>
>> diff --git a/drivers/acpi/acpi_lpss.c b/drivers/acpi/acpi_lpss.c
>> index be73974ce449..70c7d9a3f715 100644
>> --- a/drivers/acpi/acpi_lpss.c
>> +++ b/drivers/acpi/acpi_lpss.c
>> @@ -543,30 +543,6 @@ static struct device *acpi_lpss_find_device(const char *hid, const char *uid)
>>  	return bus_find_device(&pci_bus_type, NULL, &data, match_hid_uid);
>>  }
>>  
>> -static bool acpi_lpss_dep(struct acpi_device *adev, acpi_handle handle)
>> -{
>> -	struct acpi_handle_list dep_devices;
>> -	acpi_status status;
>> -	int i;
>> -
>> -	if (!acpi_has_method(adev->handle, "_DEP"))
>> -		return false;
>> -
>> -	status = acpi_evaluate_reference(adev->handle, "_DEP", NULL,
>> -					 &dep_devices);
>> -	if (ACPI_FAILURE(status)) {
>> -		dev_dbg(&adev->dev, "Failed to evaluate _DEP.\n");
>> -		return false;
>> -	}
>> -
>> -	for (i = 0; i < dep_devices.count; i++) {
>> -		if (dep_devices.handles[i] == handle)
>> -			return true;
>> -	}
>> -
>> -	return false;
>> -}
>> -
>>  static void acpi_lpss_link_consumer(struct device *dev1,
>>  				    const struct lpss_device_links *link)
>>  {
>> diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
>> index cb229e24c563..ee62c0973576 100644
>> --- a/drivers/acpi/internal.h
>> +++ b/drivers/acpi/internal.h
>> @@ -79,6 +79,7 @@ static inline void acpi_lpss_init(void) {}
>>  #endif
>>  
>>  void acpi_apd_init(void);
>> +bool acpi_lpss_dep(struct acpi_device *adev, acpi_handle handle);
> "lpss" stands for low power subsystem, an Intel device within the PCH
> that handles I2C, SPI, UART, ... I think the function should be renamed,
> as it's now generic. acpi_dev_has_dep() is a potential candidate, I'm
> sure better ones exist. A bit of kerneldoc would also not hurt.
Okedokey; I shall add kerneldoc and think of an appropriate name, plus
rename all the uses of it. How about acpi_dev_is_dep()? "has_dep" to me
implies anything at all in _DEP should return true.
>>  
>>  acpi_status acpi_hotplug_schedule(struct acpi_device *adev, u32 src);
>>  bool acpi_queue_hotplug_work(struct work_struct *work);
>> diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c
>> index ddca1550cce6..78b38775f18b 100644
>> --- a/drivers/acpi/utils.c
>> +++ b/drivers/acpi/utils.c
>> @@ -807,6 +807,30 @@ static int acpi_dev_match_cb(struct device *dev, const void *data)
>>  	return hrv == match->hrv;
>>  }
>>  
>> +bool acpi_lpss_dep(struct acpi_device *adev, acpi_handle handle)
>> +{
>> +	struct acpi_handle_list dep_devices;
>> +	acpi_status status;
>> +	int i;
>> +
>> +	if (!acpi_has_method(adev->handle, "_DEP"))
>> +		return false;
>> +
>> +	status = acpi_evaluate_reference(adev->handle, "_DEP", NULL,
>> +					 &dep_devices);
>> +	if (ACPI_FAILURE(status)) {
>> +		dev_dbg(&adev->dev, "Failed to evaluate _DEP.\n");
>> +		return false;
>> +	}
>> +
>> +	for (i = 0; i < dep_devices.count; i++) {
>> +		if (dep_devices.handles[i] == handle)
>> +			return true;
>> +	}
>> +
>> +	return false;
>> +}
>> +
>>  /**
>>   * acpi_dev_present - Detect that a given ACPI device is present
>>   * @hid: Hardware ID of the device.

On Mon, Jan 18, 2021 at 05:06:30PM +0100, Rafael J. Wysocki wrote:
> On Mon, Jan 18, 2021 at 1:30 PM Andy Shevchenko
> <andriy.shevchenko@linux.intel.com> wrote:
> >
> > On Mon, Jan 18, 2021 at 12:34:22AM +0000, Daniel Scally wrote:
> > > I need to be able to identify devices which declare themselves to be
> > > dependent on other devices through _DEP; add this function to utils.c
> > > and export it to the rest of the ACPI layer.
> >
> > Prefix -> "ACPI / utils: "
> 
> Preferably "ACPI: utils: " for that matter

Ah, good to know! I was always bending between / and : there.