/*
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* Intel Merrifield power button support
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*
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* (C) Copyright 2017 Intel Corporation
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*
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* Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; version 2
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* of the License.
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*/
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#include <linux/init.h>
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#include <linux/ioport.h>
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#include <linux/platform_device.h>
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#include <linux/sfi.h>
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#include <asm/intel-mid.h>
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#include <asm/intel_scu_ipc.h>
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static struct resource mrfld_power_btn_resources[] = {
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{
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.flags = IORESOURCE_IRQ,
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},
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};
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static struct platform_device mrfld_power_btn_dev = {
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.name = "msic_power_btn",
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.id = PLATFORM_DEVID_NONE,
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.num_resources = ARRAY_SIZE(mrfld_power_btn_resources),
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.resource = mrfld_power_btn_resources,
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};
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static int mrfld_power_btn_scu_status_change(struct notifier_block *nb,
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unsigned long code, void *data)
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{
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if (code == SCU_DOWN) {
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platform_device_unregister(&mrfld_power_btn_dev);
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return 0;
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}
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return platform_device_register(&mrfld_power_btn_dev);
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}
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static struct notifier_block mrfld_power_btn_scu_notifier = {
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.notifier_call = mrfld_power_btn_scu_status_change,
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};
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static int __init register_mrfld_power_btn(void)
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{
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if (intel_mid_identify_cpu() != INTEL_MID_CPU_CHIP_TANGIER)
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return -ENODEV;
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/*
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* We need to be sure that the SCU IPC is ready before
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* PMIC power button device can be registered:
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*/
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intel_scu_notifier_add(&mrfld_power_btn_scu_notifier);
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return 0;
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}
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arch_initcall(register_mrfld_power_btn);
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static void __init *mrfld_power_btn_platform_data(void *info)
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{
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struct resource *res = mrfld_power_btn_resources;
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struct sfi_device_table_entry *pentry = info;
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res->start = res->end = pentry->irq;
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return NULL;
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}
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static const struct devs_id mrfld_power_btn_dev_id __initconst = {
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.name = "bcove_power_btn",
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.type = SFI_DEV_TYPE_IPC,
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.delay = 1,
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.msic = 1,
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.get_platform_data = &mrfld_power_btn_platform_data,
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};
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sfi_device(mrfld_power_btn_dev_id);
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