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ACPI / gpio: Add irq_type when a GPIO is used as an interrupt 

When a GPIO is used as an interrupt in ACPI, the irq_type was not
available for device driver.

Make available polarity and triggering information in acpi_find_gpio by
renaming acpi_gpio_info field active_low  to polarity and adding triggering
field (edge/level).

For sanity, in gpiolib.c replace info.active_low by
"info.polarity == GPIO_ACTIVE_LOW".

Set the irq_type if necessary in acpi_dev_gpio_irq_get.

Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Christophe RICARD 2015-12-23 23:25:34 +01:00 committed by Rafael J. Wysocki
parent 55a93417c2
commit 52044723cd
3 changed files with 31 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

33
drivers/gpio/gpiolib-acpi.c
View File

@ -417,10 +417,15 @@ static int acpi_find_gpio(struct acpi_resource *ares, void *data)
* ActiveLow is only specified for GpioInt resource. If
* GpioIo is used then the only way to set the flag is
* to use _DSD "gpios" property.
* Note: we expect here:
* - ACPI_ACTIVE_LOW == GPIO_ACTIVE_LOW
* - ACPI_ACTIVE_HIGH == GPIO_ACTIVE_HIGH
*/
if (lookup->info.gpioint)
lookup->info.active_low =
agpio->polarity == ACPI_ACTIVE_LOW;
if (lookup->info.gpioint) {
lookup->info.polarity = agpio->polarity;
lookup->info.triggering = agpio->triggering;
}
}
return 1;
@ -447,7 +452,7 @@ static int acpi_gpio_resource_lookup(struct acpi_gpio_lookup *lookup,
if (info) {
*info = lookup->info;
if (lookup->active_low)
info->active_low = lookup->active_low;
info->polarity = lookup->active_low;
}
return 0;
}
@ -595,6 +600,7 @@ struct gpio_desc *acpi_node_get_gpiod(struct fwnode_handle *fwnode,
int acpi_dev_gpio_irq_get(struct acpi_device *adev, int index)
{
int idx, i;
unsigned int irq_flags;
for (i = 0, idx = 0; idx <= index; i++) {
struct acpi_gpio_info info;
@ -603,8 +609,23 @@ int acpi_dev_gpio_irq_get(struct acpi_device *adev, int index)
desc = acpi_get_gpiod_by_index(adev, NULL, i, &info);
if (IS_ERR(desc))
break;
if (info.gpioint && idx++ == index)
return gpiod_to_irq(desc);
if (info.gpioint && idx++ == index) {
int irq = gpiod_to_irq(desc);
if (irq < 0)
return irq;
irq_flags = acpi_dev_get_irq_type(info.triggering,
info.polarity);
/* Set type if specified and different than the current one */
if (irq_flags != IRQ_TYPE_NONE &&
irq_flags != irq_get_trigger_type(irq))
irq_set_irq_type(irq, irq_flags);
return irq;
}
}
return -ENOENT;
}

4
drivers/gpio/gpiolib.c
View File

@ -1879,7 +1879,7 @@ static struct gpio_desc *acpi_find_gpio(struct device *dev, const char *con_id,
return desc;
}
if (info.active_low)
if (info.polarity == GPIO_ACTIVE_LOW)
*flags |= GPIO_ACTIVE_LOW;
return desc;
@ -2217,7 +2217,7 @@ struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode,
desc = acpi_node_get_gpiod(fwnode, propname, 0, &info);
if (!IS_ERR(desc))
active_low = info.active_low;
active_low = info.polarity == GPIO_ACTIVE_LOW;
}
if (IS_ERR(desc))

3
drivers/gpio/gpiolib.h
View File

@ -26,7 +26,8 @@ struct acpi_device;
*/
struct acpi_gpio_info {
bool gpioint;
bool active_low;
int polarity;
int triggering;
};
/* gpio suffixes used for ACPI and device tree lookup */