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/*
* 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);
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