1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Intel Merrifield power button support
4 *
5 * (C) Copyright 2017 Intel Corporation
6 *
7 * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
8 */
9
10 #include <linux/init.h>
11 #include <linux/ioport.h>
12 #include <linux/platform_device.h>
13 #include <linux/sfi.h>
14
15 #include <asm/intel-mid.h>
16 #include <asm/intel_scu_ipc.h>
17
18 static struct resource mrfld_power_btn_resources[] = {
19 {
20 .flags = IORESOURCE_IRQ,
21 },
22 };
23
24 static struct platform_device mrfld_power_btn_dev = {
25 .name = "msic_power_btn",
26 .id = PLATFORM_DEVID_NONE,
27 .num_resources = ARRAY_SIZE(mrfld_power_btn_resources),
28 .resource = mrfld_power_btn_resources,
29 };
30
mrfld_power_btn_scu_status_change(struct notifier_block * nb,unsigned long code,void * data)31 static int mrfld_power_btn_scu_status_change(struct notifier_block *nb,
32 unsigned long code, void *data)
33 {
34 if (code == SCU_DOWN) {
35 platform_device_unregister(&mrfld_power_btn_dev);
36 return 0;
37 }
38
39 return platform_device_register(&mrfld_power_btn_dev);
40 }
41
42 static struct notifier_block mrfld_power_btn_scu_notifier = {
43 .notifier_call = mrfld_power_btn_scu_status_change,
44 };
45
register_mrfld_power_btn(void)46 static int __init register_mrfld_power_btn(void)
47 {
48 if (intel_mid_identify_cpu() != INTEL_MID_CPU_CHIP_TANGIER)
49 return -ENODEV;
50
51 /*
52 * We need to be sure that the SCU IPC is ready before
53 * PMIC power button device can be registered:
54 */
55 intel_scu_notifier_add(&mrfld_power_btn_scu_notifier);
56
57 return 0;
58 }
59 arch_initcall(register_mrfld_power_btn);
60
mrfld_power_btn_platform_data(void * info)61 static void __init *mrfld_power_btn_platform_data(void *info)
62 {
63 struct resource *res = mrfld_power_btn_resources;
64 struct sfi_device_table_entry *pentry = info;
65
66 res->start = res->end = pentry->irq;
67 return NULL;
68 }
69
70 static const struct devs_id mrfld_power_btn_dev_id __initconst = {
71 .name = "bcove_power_btn",
72 .type = SFI_DEV_TYPE_IPC,
73 .delay = 1,
74 .msic = 1,
75 .get_platform_data = &mrfld_power_btn_platform_data,
76 };
77
78 sfi_device(mrfld_power_btn_dev_id);
79