[v1,2/2] ALSA: hda: cs35l41: Use ACPI_COMPANION to read acpi properties

  Currently the driver finds the acpi_device used to read certain
properties using the HID, however, this is not necessary, as the
acpi_device can be obtained from the device itself.

With the ACPI_COMPANION correctly set, we can also simplify how
we obtain the reset gpio.

Signed-off-by: Stefan Binding <sbinding@opensource.cirrus.com>
---
 sound/pci/hda/cs35l41_hda.c | 50 ++++++++++++++++---------------------
 1 file changed, 21 insertions(+), 29 deletions(-)
  

On Thu, Nov 24, 2022 at 1:07 PM Stefan Binding
<sbinding@opensource.cirrus.com> wrote:
>
> Currently the driver finds the acpi_device used to read certain
> properties using the HID, however, this is not necessary, as the
> acpi_device can be obtained from the device itself.
>
> With the ACPI_COMPANION correctly set, we can also simplify how

ACPI companion device

> we obtain the reset gpio.

GPIO

...

The idea seems to be an improvement to me. Thanks.

But I have side question, are you going to address the
https://bugzilla.kernel.org/show_bug.cgi?id=215993

P.S. It would be nice if you have an account there, so I can reassign
that to you.
  

Hi,

On 11/24/22 12:07, Stefan Binding wrote:
> Currently the driver finds the acpi_device used to read certain
> properties using the HID, however, this is not necessary, as the
> acpi_device can be obtained from the device itself.
> 
> With the ACPI_COMPANION correctly set, we can also simplify how
> we obtain the reset gpio.

Typically when you write "also do ..." in a commit message
that is a hint to yourself that it might be better to split
the commit into 2 commits which each do only 1 thing, for easier
review. But e.g. also to easier see what is going on if a bisect
points out the commit as being the first bad one.

So once the issues with patch 1/2 are resolved, please consider
splitting this patch into 2 smaller patches.

Regards,

Hans


> 
> Signed-off-by: Stefan Binding <sbinding@opensource.cirrus.com>
> ---
>  sound/pci/hda/cs35l41_hda.c | 50 ++++++++++++++++---------------------
>  1 file changed, 21 insertions(+), 29 deletions(-)
> 
> diff --git a/sound/pci/hda/cs35l41_hda.c b/sound/pci/hda/cs35l41_hda.c
> index e5f0549bf06d..50cbbcce4946 100644
> --- a/sound/pci/hda/cs35l41_hda.c
> +++ b/sound/pci/hda/cs35l41_hda.c
> @@ -1214,16 +1214,15 @@ static int cs35l41_get_speaker_id(struct device *dev, int amp_index,
>   * And devm functions expect that the device requesting the resource has the correct
>   * fwnode.
>   */
> -static int cs35l41_no_acpi_dsd(struct cs35l41_hda *cs35l41, struct device *physdev, int id,
> -			       const char *hid)
> +static int cs35l41_no_acpi_dsd(struct cs35l41_hda *cs35l41, int id, const char *hid)
>  {
>  	struct cs35l41_hw_cfg *hw_cfg = &cs35l41->hw_cfg;
>  
>  	/* check I2C address to assign the index */
>  	cs35l41->index = id == 0x40 ? 0 : 1;
>  	cs35l41->channel_index = 0;
> -	cs35l41->reset_gpio = gpiod_get_index(physdev, NULL, 0, GPIOD_OUT_HIGH);
> -	cs35l41->speaker_id = cs35l41_get_speaker_id(physdev, 0, 0, 2);
> +	cs35l41->reset_gpio = gpiod_get_index(cs35l41->dev, NULL, 0, GPIOD_OUT_HIGH);
> +	cs35l41->speaker_id = cs35l41_get_speaker_id(cs35l41->dev, 0, 0, 2);
>  	hw_cfg->spk_pos = cs35l41->index;
>  	hw_cfg->gpio2.func = CS35L41_INTERRUPT;
>  	hw_cfg->gpio2.valid = true;
> @@ -1255,39 +1254,36 @@ static int cs35l41_hda_read_acpi(struct cs35l41_hda *cs35l41, const char *hid, i
>  	struct cs35l41_hw_cfg *hw_cfg = &cs35l41->hw_cfg;
>  	u32 values[HDA_MAX_COMPONENTS];
>  	struct acpi_device *adev;
> -	struct device *physdev;
> +
>  	const char *sub;
>  	char *property;
>  	size_t nval;
>  	int i, ret;
>  
> -	adev = acpi_dev_get_first_match_dev(hid, NULL, -1);
> +	adev = ACPI_COMPANION(cs35l41->dev);
>  	if (!adev) {
> -		dev_err(cs35l41->dev, "Failed to find an ACPI device for %s\n", hid);
> +		dev_err(cs35l41->dev, "Failed to find an ACPI device for %s\n",
> +			dev_name(cs35l41->dev));
>  		return -ENODEV;
>  	}
>  
> -	physdev = get_device(acpi_get_first_physical_node(adev));
> -	acpi_dev_put(adev);
> -
> -	sub = acpi_get_subsystem_id(ACPI_HANDLE(physdev));
> +	sub = acpi_get_subsystem_id(ACPI_HANDLE(cs35l41->dev));
>  	if (IS_ERR(sub))
>  		sub = NULL;
>  	cs35l41->acpi_subsystem_id = sub;
>  
>  	property = "cirrus,dev-index";
> -	ret = device_property_count_u32(physdev, property);
> -	if (ret <= 0) {
> -		ret = cs35l41_no_acpi_dsd(cs35l41, physdev, id, hid);
> -		goto err_put_physdev;
> -	}
> +	ret = device_property_count_u32(cs35l41->dev, property);
> +	if (ret <= 0)
> +		return cs35l41_no_acpi_dsd(cs35l41, id, hid);
> +
>  	if (ret > ARRAY_SIZE(values)) {
>  		ret = -EINVAL;
>  		goto err;
>  	}
>  	nval = ret;
>  
> -	ret = device_property_read_u32_array(physdev, property, values, nval);
> +	ret = device_property_read_u32_array(cs35l41->dev, property, values, nval);
>  	if (ret)
>  		goto err;
>  
> @@ -1307,11 +1303,10 @@ static int cs35l41_hda_read_acpi(struct cs35l41_hda *cs35l41, const char *hid, i
>  	/* To use the same release code for all laptop variants we can't use devm_ version of
>  	 * gpiod_get here, as CLSA010* don't have a fully functional bios with an _DSD node
>  	 */
> -	cs35l41->reset_gpio = fwnode_gpiod_get_index(acpi_fwnode_handle(adev), "reset", cs35l41->index,
> -						     GPIOD_OUT_LOW, "cs35l41-reset");
> +	cs35l41->reset_gpio = gpiod_get_index(cs35l41->dev, "reset", cs35l41->index, GPIOD_OUT_LOW);
>  
>  	property = "cirrus,speaker-position";
> -	ret = device_property_read_u32_array(physdev, property, values, nval);
> +	ret = device_property_read_u32_array(cs35l41->dev, property, values, nval);
>  	if (ret)
>  		goto err;
>  	hw_cfg->spk_pos = values[cs35l41->index];
> @@ -1322,41 +1317,41 @@ static int cs35l41_hda_read_acpi(struct cs35l41_hda *cs35l41, const char *hid, i
>  			cs35l41->channel_index++;
>  
>  	property = "cirrus,gpio1-func";
> -	ret = device_property_read_u32_array(physdev, property, values, nval);
> +	ret = device_property_read_u32_array(cs35l41->dev, property, values, nval);
>  	if (ret)
>  		goto err;
>  	hw_cfg->gpio1.func = values[cs35l41->index];
>  	hw_cfg->gpio1.valid = true;
>  
>  	property = "cirrus,gpio2-func";
> -	ret = device_property_read_u32_array(physdev, property, values, nval);
> +	ret = device_property_read_u32_array(cs35l41->dev, property, values, nval);
>  	if (ret)
>  		goto err;
>  	hw_cfg->gpio2.func = values[cs35l41->index];
>  	hw_cfg->gpio2.valid = true;
>  
>  	property = "cirrus,boost-peak-milliamp";
> -	ret = device_property_read_u32_array(physdev, property, values, nval);
> +	ret = device_property_read_u32_array(cs35l41->dev, property, values, nval);
>  	if (ret == 0)
>  		hw_cfg->bst_ipk = values[cs35l41->index];
>  	else
>  		hw_cfg->bst_ipk = -1;
>  
>  	property = "cirrus,boost-ind-nanohenry";
> -	ret = device_property_read_u32_array(physdev, property, values, nval);
> +	ret = device_property_read_u32_array(cs35l41->dev, property, values, nval);
>  	if (ret == 0)
>  		hw_cfg->bst_ind = values[cs35l41->index];
>  	else
>  		hw_cfg->bst_ind = -1;
>  
>  	property = "cirrus,boost-cap-microfarad";
> -	ret = device_property_read_u32_array(physdev, property, values, nval);
> +	ret = device_property_read_u32_array(cs35l41->dev, property, values, nval);
>  	if (ret == 0)
>  		hw_cfg->bst_cap = values[cs35l41->index];
>  	else
>  		hw_cfg->bst_cap = -1;
>  
> -	cs35l41->speaker_id = cs35l41_get_speaker_id(physdev, cs35l41->index, nval, -1);
> +	cs35l41->speaker_id = cs35l41_get_speaker_id(cs35l41->dev, cs35l41->index, nval, -1);
>  
>  	if (hw_cfg->bst_ind > 0 || hw_cfg->bst_cap > 0 || hw_cfg->bst_ipk > 0)
>  		hw_cfg->bst_type = CS35L41_INT_BOOST;
> @@ -1364,14 +1359,11 @@ static int cs35l41_hda_read_acpi(struct cs35l41_hda *cs35l41, const char *hid, i
>  		hw_cfg->bst_type = CS35L41_EXT_BOOST;
>  
>  	hw_cfg->valid = true;
> -	put_device(physdev);
>  
>  	return 0;
>  
>  err:
>  	dev_err(cs35l41->dev, "Failed property %s: %d\n", property, ret);
> -err_put_physdev:
> -	put_device(physdev);
>  
>  	return ret;
>  }