[PATCH v6 2/2] gpio: dwapb: add gpio-signaled acpi event support

From: qiujiang
Date: Fri Mar 25 2016 - 22:22:36 EST


This patch adds gpio-signaled acpi event support. It is used for
power button on hisilicon D02 board, an arm64 platform.

Corresponding DSDT file is defined as follows:
Device(GPI0) {
Name(_HID, "HISI0181")
Name(_ADR, 0)
Name(_UID, 0)

Name (_CRS, ResourceTemplate () {
Memory32Fixed (ReadWrite, 0x802e0000, 0x10000)
Interrupt (ResourceConsumer, Level, ActiveHigh,
Exclusive,,,) {344}
})

Device(PRTa) {
Name (_DSD, Package () {
Package () {
Package () {"reg",0},
Package () {"snps,nr-gpios",32},
}
})
}

Name (_AEI, ResourceTemplate () {
GpioInt(Edge, ActiveLow, ExclusiveAndWake,
PullUp, , " \\_SB.GPI0") {8}
})

Method (_E08, 0x0, NotSerialized) {
Notify (\_SB.PWRB, 0x80)
}
}

Acked-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
Reviewed-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx>
Signed-off-by: qiujiang <qiujiang@xxxxxxxxxx>
---
drivers/gpio/gpio-dwapb.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)

diff --git a/drivers/gpio/gpio-dwapb.c b/drivers/gpio/gpio-dwapb.c
index 3498393..f52adc9 100644
--- a/drivers/gpio/gpio-dwapb.c
+++ b/drivers/gpio/gpio-dwapb.c
@@ -7,6 +7,7 @@
*
* All enquiries to support@xxxxxxxxxxxx
*/
+#include <linux/acpi.h>
#include <linux/gpio/driver.h>
/* FIXME: for gpio_get_value(), replace this with direct register read */
#include <linux/gpio.h>
@@ -27,6 +28,8 @@
#include <linux/platform_data/gpio-dwapb.h>
#include <linux/slab.h>

+#include "gpiolib.h"
+
#define GPIO_SWPORTA_DR 0x00
#define GPIO_SWPORTA_DDR 0x04
#define GPIO_SWPORTB_DR 0x0c
@@ -436,6 +439,10 @@ static int dwapb_gpio_add_port(struct dwapb_gpio *gpio,
else
port->is_registered = true;

+ /* Add GPIO-signaled ACPI event support */
+ if (pp->irq)
+ acpi_gpiochip_request_interrupts(&port->gc);
+
return err;
}

@@ -502,10 +509,17 @@ dwapb_gpio_get_pdata(struct device *dev)
}
}

+ if (has_acpi_companion(dev) && pp->idx == 0)
+ pp->irq = platform_get_irq(to_platform_device(dev), 0);
+
pp->irq_shared = false;
pp->gpio_base = -1;
+
if (dev->of_node)
pp->name = to_of_node(fwnode)->full_name;
+
+ if (has_acpi_companion(dev))
+ pp->name = acpi_dev_name(to_acpi_device_node(fwnode));
}

return pdata;
@@ -578,6 +592,12 @@ static const struct of_device_id dwapb_of_match[] = {
};
MODULE_DEVICE_TABLE(of, dwapb_of_match);

+static const struct acpi_device_id dwapb_acpi_match[] = {
+ {"HISI0181", 0},
+ { }
+};
+MODULE_DEVICE_TABLE(acpi, dwapb_acpi_match);
+
#ifdef CONFIG_PM_SLEEP
static int dwapb_gpio_suspend(struct device *dev)
{
@@ -672,6 +692,7 @@ static struct platform_driver dwapb_gpio_driver = {
.name = "gpio-dwapb",
.pm = &dwapb_gpio_pm_ops,
.of_match_table = of_match_ptr(dwapb_of_match),
+ .acpi_match_table = ACPI_PTR(dwapb_acpi_match),
},
.probe = dwapb_gpio_probe,
.remove = dwapb_gpio_remove,
--
1.9.1