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Commit 859bb6d5 authored by Andy Shevchenko's avatar Andy Shevchenko Committed by Thomas Gleixner
Browse files

x86/platform/intel-mid: Add power button support for Merrifield 



Intel Merrifield platform has a Basin Cove PMIC to handle in particular
power button events. Add necessary bits to enable it.

Signed-off-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20170308112422.67533-2-andriy.shevchenko@linux.intel.com


Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent c836e5cf

arch/x86/platform/intel-mid/device_libs/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -26,5 +26,6 @@ obj-$(subst m,y,$(CONFIG_GPIO_PCA953X)) += platform_pcal9555a.o 
obj-$(subst m,y,$(CONFIG_GPIO_PCA953X)) += platform_tca6416.o

# MISC Devices

obj-$(subst m,y,$(CONFIG_KEYBOARD_GPIO)) += platform_gpio_keys.o

obj-$(subst m,y,$(CONFIG_INTEL_MID_POWER_BUTTON)) += platform_mrfld_power_btn.o

obj-$(subst m,y,$(CONFIG_RTC_DRV_CMOS)) += platform_mrfld_rtc.o

obj-$(subst m,y,$(CONFIG_INTEL_MID_WATCHDOG)) += platform_mrfld_wdt.o

arch/x86/platform/intel-mid/device_libs/platform_mrfld_power_btn.c

0 → 100644
+82 −0
Original line number Diff line number Diff line 
/*

 * Intel Merrifield power button support

 *

 * (C) Copyright 2017 Intel Corporation

 *

 * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; version 2

 * of the License.

 */



#include <linux/init.h>

#include <linux/ioport.h>

#include <linux/platform_device.h>

#include <linux/sfi.h>



#include <asm/intel-mid.h>

#include <asm/intel_scu_ipc.h>



static struct resource mrfld_power_btn_resources[] = {

	{

		.flags		= IORESOURCE_IRQ,

	},

};



static struct platform_device mrfld_power_btn_dev = {

	.name		= "msic_power_btn",

	.id		= PLATFORM_DEVID_NONE,

	.num_resources	= ARRAY_SIZE(mrfld_power_btn_resources),

	.resource	= mrfld_power_btn_resources,

};



static int mrfld_power_btn_scu_status_change(struct notifier_block *nb,

					     unsigned long code, void *data)

{

	if (code == SCU_DOWN) {

		platform_device_unregister(&mrfld_power_btn_dev);

		return 0;

	}



	return platform_device_register(&mrfld_power_btn_dev);

}



static struct notifier_block mrfld_power_btn_scu_notifier = {

	.notifier_call	= mrfld_power_btn_scu_status_change,

};



static int __init register_mrfld_power_btn(void)

{

	if (intel_mid_identify_cpu() != INTEL_MID_CPU_CHIP_TANGIER)

		return -ENODEV;



	/*

	 * We need to be sure that the SCU IPC is ready before

	 * PMIC power button device can be registered:

	 */

	intel_scu_notifier_add(&mrfld_power_btn_scu_notifier);



	return 0;

}

arch_initcall(register_mrfld_power_btn);



static void __init *mrfld_power_btn_platform_data(void *info)

{

	struct resource *res = mrfld_power_btn_resources;

	struct sfi_device_table_entry *pentry = info;



	res->start = res->end = pentry->irq;

	return NULL;

}



static const struct devs_id mrfld_power_btn_dev_id __initconst = {

	.name			= "bcove_power_btn",

	.type			= SFI_DEV_TYPE_IPC,

	.delay			= 1,

	.msic			= 1,

	.get_platform_data	= &mrfld_power_btn_platform_data,

};



sfi_device(mrfld_power_btn_dev_id);