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Date: Fri, 24 Oct 2014 10:34:36 +0300
From: Mika Westerberg <mika.westerberg@...ux.intel.com>
To: "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc: Arnd Bergmann <arnd@...db.de>,
Alexandre Courbot <gnurou@...il.com>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Grant Likely <grant.likely@...aro.org>,
ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
Aaron Lu <aaron.lu@...el.com>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
Linus Walleij <linus.walleij@...aro.org>,
Dmitry Torokhov <dmitry.torokhov@...il.com>,
Bryan Wu <cooloney@...il.com>,
Darren Hart <dvhart@...ux.intel.com>,
Mark Rutland <mark.rutland@....com>
Subject: Re: GPIO bindings guidelines (Was: Re: [PATCH v5 10/12] gpio:
Support for unified device properties interface)
On Thu, Oct 23, 2014 at 11:51:59PM +0200, Rafael J. Wysocki wrote:
> OK, let's try to take that a bit farther. :-)
>
> With the (untested) patch below applied (which is a replacement for the one
> sent previously), the driver can use static tables like these:
>
> static struct acpi_gpio_params reset_gpios = { 0, 0, false };
> statuc struct acpi_gpio_params shutdown_gpios = { 1, 0, false };
>
> static struct acpi_gpio_mapping my_gpio_mapping[] = {
> { "reset-gpios", &reset_gpios, 1 },
> { "shutdown-gpios", &shutdown_gpios, 1 },
> NULL,
> };
>
This is even better :-)
I tried this with few changes:
- constify the mapping parameter
- check for NULL adev->driver_gpios in acpi_get_driver_gpio_data()
- check for gm->name instead of gm in acpi_get_driver_gpio_data()
It works just fine. For reference here are my changes to rkill-gpio.c:
diff --git a/net/rfkill/rfkill-gpio.c b/net/rfkill/rfkill-gpio.c
index 0f62326c0f5e..ec8f5ac53520 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)
@@ -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_index(&pdev->dev, "shutdown", 0);
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;
}
And here are the changes on top of your patch:
diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c
index 691501b53c5e..4151cd774f2f 100644
--- a/drivers/gpio/gpiolib-acpi.c
+++ b/drivers/gpio/gpiolib-acpi.c
@@ -288,7 +288,7 @@ void acpi_gpiochip_free_interrupts(struct gpio_chip *chip)
}
int acpi_dev_add_driver_gpios(struct acpi_device *adev,
- struct acpi_gpio_mapping *gpios)
+ const struct acpi_gpio_mapping *gpios)
{
if (adev && gpios) {
adev->driver_gpios = gpios;
@@ -302,11 +302,14 @@ static bool acpi_get_driver_gpio_data(struct acpi_device *adev,
const char *name, int index,
struct acpi_reference_args *args)
{
- struct acpi_gpio_mapping *gm;
+ const struct acpi_gpio_mapping *gm;
- for (gm = adev->driver_gpios; gm; gm++)
+ if (!adev->driver_gpios)
+ return false;
+
+ for (gm = adev->driver_gpios; gm->name; gm++)
if (!strcmp(name, gm->name) && gm->data && index < gm->size) {
- struct acpi_gpio_params *par = gm->data + index;
+ const struct acpi_gpio_params *par = gm->data + index;
args->adev = adev;
args->args[0] = par->crs_entry_index;
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index 2de7a2614c61..98d992062270 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -368,7 +368,7 @@ struct acpi_device {
struct acpi_scan_handler *handler;
struct acpi_hotplug_context *hp;
struct acpi_driver *driver;
- struct acpi_gpio_mapping *driver_gpios;
+ const struct acpi_gpio_mapping *driver_gpios;
void *driver_data;
struct device dev;
unsigned int physical_node_count;
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 26b7a639f4b9..23f9c55d0331 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -680,13 +680,13 @@ struct acpi_gpio_params {
struct acpi_gpio_mapping {
const char *name;
- struct acpi_gpio_params *data;
+ const struct acpi_gpio_params *data;
unsigned int size;
};
#if defined(CONFIG_ACPI) && defined(CONFIG_GPIOLIB)
int acpi_dev_add_driver_gpios(struct acpi_device *adev,
- struct acpi_gpio_mapping *gpios);
+ const struct acpi_gpio_mapping *gpios);
static inline void acpi_dev_remove_driver_gpios(struct acpi_device *adev)
{
@@ -695,7 +695,7 @@ static inline void acpi_dev_remove_driver_gpios(struct acpi_device *adev)
}
#else
static inline int acpi_dev_add_driver_gpios(struct acpi_device *adev,
- struct acpi_gpio_mapping *gpios)
+ const struct acpi_gpio_mapping *gpios)
{
return -ENXIO;
}
--
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