Commit e6cb3486 authored by Jiang Qiu's avatar Jiang Qiu Committed by Linus Walleij
Browse files

gpio: dwapb: add gpio-signaled acpi event support 



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: default avatarMika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: default avatarAndy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: default avatarJiang Qiu <qiujiang@huawei.com>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent 4ba8cfa7

drivers/gpio/gpio-dwapb.c

+17 −0
Original line number Diff line number Diff line
@@ -7,6 +7,7 @@ 
 *

 * All enquiries to support@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
@@ -435,6 +438,10 @@ 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;

}
@@ -502,6 +509,9 @@ 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;

	}
@@ -576,6 +586,12 @@ 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)

{
@@ -670,6 +686,7 @@ 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,

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