[PATCH v8 3/3] gpio: dwapb: add gpio-signaled acpi event support

[Jiang Qiu]

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

The 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.westerb...@linux.intel.com>
Reviewed-by: Andy Shevchenko <andy.shevche...@gmail.com>
Signed-off-by: Jiang Qiu <qiuji...@huawei.com>
---
 drivers/gpio/gpio-dwapb.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/gpio/gpio-dwapb.c b/drivers/gpio/gpio-dwapb.c
index 7258cc5..b2b83d6 100644
--- a/drivers/gpio/gpio-dwapb.c
+++ b/drivers/gpio/gpio-dwapb.c
@@ -7,6 +7,7 @@
  *
  * All enquiries to supp...@picochip.com
  */
+#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;
 }
 
@@ -503,6 +510,9 @@ dwapb_gpio_get_pdata(struct device *dev)
                                dev_warn(dev, "no irq for port%d\n", pp->idx);
                }
 
+               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;
        }
@@ -577,6 +587,12 @@ 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)
 {
@@ -671,6 +687,7 @@ 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