[PATCH RESEND] net: rfkill: gpio: Add ACPI default GPIO driver mappings

[PATCH RESEND] net: rfkill: gpio: Add ACPI default GPIO driver mappings

[Mika Westerberg]

The driver uses devm_gpiod_get_index(..., index) so that the index refers
directly to the GpioIo resource under the ACPI device. The problem with
this is that if the ordering changes we get wrong GPIOs.

With ACPI 5.1 _DSD we can now use names instead to reference GPIOs
analogous to Device Tree. However, we still have systems out there that do
not provide _DSD at all. These systems must be supported as well.

Luckily we now have acpi_dev_add_driver_gpios() that can be used to provide
mappings for systems where _DSD is not provided and still take advantage of
_DSD if it exists.

This patch converts the rfkill-gpio.c driver to create default GPIO
mappings to the two GPIOs in case we are running on ACPI system.

While there we can drop the indices completely.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Johannes Berg <johannes@sipsolutions.net>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Acked-by: John W. Linville <linville@tuxdriver.com>
---
Resending with linux-acpi included. I also added ACKs from Johannes and
John. The patch itself is intact.

 net/rfkill/rfkill-gpio.c | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

diff --git a/net/rfkill/rfkill-gpio.c b/net/rfkill/rfkill-gpio.c
index 0f62326c0f5e..2a4717967502 100644
--- a/net/rfkill/rfkill-gpio.c
+++ b/net/rfkill/rfkill-gpio.c
@@ -63,6 +63,15 @@ static const struct rfkill_ops rfkill_gpio_ops = {
 	.set_block = rfkill_gpio_set_power,
 };
 
+static const struct acpi_gpio_params reset_gpios = { 0, 0, false };
+static const struct acpi_gpio_params shutdown_gpios = { 1, 0, false };
+
+static const struct acpi_gpio_mapping acpi_rfkill_default_gpios[] = {
+	{ "reset-gpios", &reset_gpios, 1 },
+	{ "shutdown-gpios", &shutdown_gpios, 1 },
+	{ },
+};
+
 static int rfkill_gpio_acpi_probe(struct device *dev,
 				  struct rfkill_gpio_data *rfkill)
 {
@@ -75,7 +84,8 @@ static int rfkill_gpio_acpi_probe(struct device *dev,
 	rfkill->name = dev_name(dev);
 	rfkill->type = (unsigned)id->driver_data;
 
-	return 0;
+	return acpi_dev_add_driver_gpios(ACPI_COMPANION(dev),
+					 acpi_rfkill_default_gpios);
 }
 
 static int rfkill_gpio_probe(struct platform_device *pdev)
@@ -102,7 +112,7 @@ static int rfkill_gpio_probe(struct platform_device *pdev)
 
 	rfkill->clk = devm_clk_get(&pdev->dev, NULL);
 
-	gpio = devm_gpiod_get_index(&pdev->dev, "reset", 0);
+	gpio = devm_gpiod_get(&pdev->dev, "reset");
 	if (!IS_ERR(gpio)) {
 		ret = gpiod_direction_output(gpio, 0);
 		if (ret)
@@ -110,7 +120,7 @@ static int rfkill_gpio_probe(struct platform_device *pdev)
 		rfkill->reset_gpio = gpio;
 	}
 
-	gpio = devm_gpiod_get_index(&pdev->dev, "shutdown", 1);
+	gpio = devm_gpiod_get(&pdev->dev, "shutdown");
 	if (!IS_ERR(gpio)) {
 		ret = gpiod_direction_output(gpio, 0);
 		if (ret)
@@ -150,6 +160,8 @@ static int rfkill_gpio_remove(struct platform_device *pdev)
 	rfkill_unregister(rfkill->rfkill_dev);
 	rfkill_destroy(rfkill->rfkill_dev);
 
+	acpi_dev_remove_driver_gpios(ACPI_COMPANION(&pdev->dev));
+
 	return 0;
 }
 
-- 
2.1.1

Re: [PATCH RESEND] net: rfkill: gpio: Add ACPI default GPIO driver mappings

[Rafael J. Wysocki]

On Tuesday, October 28, 2014 12:03:48 PM Mika Westerberg wrote:
> The driver uses devm_gpiod_get_index(..., index) so that the index refers
> directly to the GpioIo resource under the ACPI device. The problem with
> this is that if the ordering changes we get wrong GPIOs.
> 
> With ACPI 5.1 _DSD we can now use names instead to reference GPIOs
> analogous to Device Tree. However, we still have systems out there that do
> not provide _DSD at all. These systems must be supported as well.
> 
> Luckily we now have acpi_dev_add_driver_gpios() that can be used to provide
> mappings for systems where _DSD is not provided and still take advantage of
> _DSD if it exists.
> 
> This patch converts the rfkill-gpio.c driver to create default GPIO
> mappings to the two GPIOs in case we are running on ACPI system.
> 
> While there we can drop the indices completely.
> 
> Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
> Reviewed-by: Johannes Berg <johannes@sipsolutions.net>
> Acked-by: Johannes Berg <johannes@sipsolutions.net>
> Acked-by: John W. Linville <linville@tuxdriver.com>

Applied, thanks!

> ---
> Resending with linux-acpi included. I also added ACKs from Johannes and
> John. The patch itself is intact.
> 
>  net/rfkill/rfkill-gpio.c | 18 +++++++++++++++---
>  1 file changed, 15 insertions(+), 3 deletions(-)
> 
> diff --git a/net/rfkill/rfkill-gpio.c b/net/rfkill/rfkill-gpio.c
> index 0f62326c0f5e..2a4717967502 100644
> --- a/net/rfkill/rfkill-gpio.c
> +++ b/net/rfkill/rfkill-gpio.c
> @@ -63,6 +63,15 @@ static const struct rfkill_ops rfkill_gpio_ops = {
>  	.set_block = rfkill_gpio_set_power,
>  };
>  
> +static const struct acpi_gpio_params reset_gpios = { 0, 0, false };
> +static const struct acpi_gpio_params shutdown_gpios = { 1, 0, false };
> +
> +static const struct acpi_gpio_mapping acpi_rfkill_default_gpios[] = {
> +	{ "reset-gpios", &reset_gpios, 1 },
> +	{ "shutdown-gpios", &shutdown_gpios, 1 },
> +	{ },
> +};
> +
>  static int rfkill_gpio_acpi_probe(struct device *dev,
>  				  struct rfkill_gpio_data *rfkill)
>  {
> @@ -75,7 +84,8 @@ static int rfkill_gpio_acpi_probe(struct device *dev,
>  	rfkill->name = dev_name(dev);
>  	rfkill->type = (unsigned)id->driver_data;
>  
> -	return 0;
> +	return acpi_dev_add_driver_gpios(ACPI_COMPANION(dev),
> +					 acpi_rfkill_default_gpios);
>  }
>  
>  static int rfkill_gpio_probe(struct platform_device *pdev)
> @@ -102,7 +112,7 @@ static int rfkill_gpio_probe(struct platform_device *pdev)
>  
>  	rfkill->clk = devm_clk_get(&pdev->dev, NULL);
>  
> -	gpio = devm_gpiod_get_index(&pdev->dev, "reset", 0);
> +	gpio = devm_gpiod_get(&pdev->dev, "reset");
>  	if (!IS_ERR(gpio)) {
>  		ret = gpiod_direction_output(gpio, 0);
>  		if (ret)
> @@ -110,7 +120,7 @@ static int rfkill_gpio_probe(struct platform_device *pdev)
>  		rfkill->reset_gpio = gpio;
>  	}
>  
> -	gpio = devm_gpiod_get_index(&pdev->dev, "shutdown", 1);
> +	gpio = devm_gpiod_get(&pdev->dev, "shutdown");
>  	if (!IS_ERR(gpio)) {
>  		ret = gpiod_direction_output(gpio, 0);
>  		if (ret)
> @@ -150,6 +160,8 @@ static int rfkill_gpio_remove(struct platform_device *pdev)
>  	rfkill_unregister(rfkill->rfkill_dev);
>  	rfkill_destroy(rfkill->rfkill_dev);
>  
> +	acpi_dev_remove_driver_gpios(ACPI_COMPANION(&pdev->dev));
> +
>  	return 0;
>  }
>  
> 

-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.