summaryrefslogtreecommitdiff
path: root/drivers/platform/x86/simatic-ipc.c
blob: ca76076fc706a62def16d7bdd0b69baca7a3adfd (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
// SPDX-License-Identifier: GPL-2.0
/*
 * Siemens SIMATIC IPC platform driver
 *
 * Copyright (c) Siemens AG, 2018-2021
 *
 * Authors:
 *  Henning Schild <henning.schild@siemens.com>
 *  Jan Kiszka <jan.kiszka@siemens.com>
 *  Gerd Haeussler <gerd.haeussler.ext@siemens.com>
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/dmi.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/platform_data/x86/simatic-ipc.h>
#include <linux/platform_device.h>

static struct platform_device *ipc_led_platform_device;
static struct platform_device *ipc_wdt_platform_device;

static const struct dmi_system_id simatic_ipc_whitelist[] = {
	{
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "SIEMENS AG"),
		},
	},
	{}
};

static struct simatic_ipc_platform platform_data;

static struct {
	u32 station_id;
	u8 led_mode;
	u8 wdt_mode;
} device_modes[] = {
	{SIMATIC_IPC_IPC127E, SIMATIC_IPC_DEVICE_127E, SIMATIC_IPC_DEVICE_NONE},
	{SIMATIC_IPC_IPC227D, SIMATIC_IPC_DEVICE_227D, SIMATIC_IPC_DEVICE_NONE},
	{SIMATIC_IPC_IPC227E, SIMATIC_IPC_DEVICE_427E, SIMATIC_IPC_DEVICE_227E},
	{SIMATIC_IPC_IPC227G, SIMATIC_IPC_DEVICE_227G, SIMATIC_IPC_DEVICE_227G},
	{SIMATIC_IPC_IPC277E, SIMATIC_IPC_DEVICE_NONE, SIMATIC_IPC_DEVICE_227E},
	{SIMATIC_IPC_IPC427D, SIMATIC_IPC_DEVICE_427E, SIMATIC_IPC_DEVICE_NONE},
	{SIMATIC_IPC_IPC427E, SIMATIC_IPC_DEVICE_427E, SIMATIC_IPC_DEVICE_427E},
	{SIMATIC_IPC_IPC477E, SIMATIC_IPC_DEVICE_NONE, SIMATIC_IPC_DEVICE_427E},
	{SIMATIC_IPC_IPC427G, SIMATIC_IPC_DEVICE_227G, SIMATIC_IPC_DEVICE_227G},
};

static int register_platform_devices(u32 station_id)
{
	u8 ledmode = SIMATIC_IPC_DEVICE_NONE;
	u8 wdtmode = SIMATIC_IPC_DEVICE_NONE;
	char *pdevname = KBUILD_MODNAME "_leds";
	int i;

	platform_data.devmode = SIMATIC_IPC_DEVICE_NONE;

	for (i = 0; i < ARRAY_SIZE(device_modes); i++) {
		if (device_modes[i].station_id == station_id) {
			ledmode = device_modes[i].led_mode;
			wdtmode = device_modes[i].wdt_mode;
			break;
		}
	}

	if (ledmode != SIMATIC_IPC_DEVICE_NONE) {
		if (ledmode == SIMATIC_IPC_DEVICE_127E ||
		    ledmode == SIMATIC_IPC_DEVICE_227G)
			pdevname = KBUILD_MODNAME "_leds_gpio";
		platform_data.devmode = ledmode;
		ipc_led_platform_device =
			platform_device_register_data(NULL,
				pdevname, PLATFORM_DEVID_NONE,
				&platform_data,
				sizeof(struct simatic_ipc_platform));
		if (IS_ERR(ipc_led_platform_device))
			return PTR_ERR(ipc_led_platform_device);

		pr_debug("device=%s created\n",
			 ipc_led_platform_device->name);
	}

	if (wdtmode == SIMATIC_IPC_DEVICE_227G) {
		request_module("w83627hf_wdt");
		return 0;
	}

	if (wdtmode != SIMATIC_IPC_DEVICE_NONE) {
		platform_data.devmode = wdtmode;
		ipc_wdt_platform_device =
			platform_device_register_data(NULL,
				KBUILD_MODNAME "_wdt", PLATFORM_DEVID_NONE,
				&platform_data,
				sizeof(struct simatic_ipc_platform));
		if (IS_ERR(ipc_wdt_platform_device))
			return PTR_ERR(ipc_wdt_platform_device);

		pr_debug("device=%s created\n",
			 ipc_wdt_platform_device->name);
	}

	if (ledmode == SIMATIC_IPC_DEVICE_NONE &&
	    wdtmode == SIMATIC_IPC_DEVICE_NONE) {
		pr_warn("unsupported IPC detected, station id=%08x\n",
			station_id);
		return -EINVAL;
	}

	return 0;
}

static int __init simatic_ipc_init_module(void)
{
	const struct dmi_system_id *match;
	u32 station_id;
	int err;

	match = dmi_first_match(simatic_ipc_whitelist);
	if (!match)
		return 0;

	err = dmi_walk(simatic_ipc_find_dmi_entry_helper, &station_id);

	if (err || station_id == SIMATIC_IPC_INVALID_STATION_ID) {
		pr_warn("DMI entry %d not found\n", SIMATIC_IPC_DMI_ENTRY_OEM);
		return 0;
	}

	return register_platform_devices(station_id);
}

static void __exit simatic_ipc_exit_module(void)
{
	platform_device_unregister(ipc_led_platform_device);
	ipc_led_platform_device = NULL;

	platform_device_unregister(ipc_wdt_platform_device);
	ipc_wdt_platform_device = NULL;
}

module_init(simatic_ipc_init_module);
module_exit(simatic_ipc_exit_module);

MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Gerd Haeussler <gerd.haeussler.ext@siemens.com>");
MODULE_ALIAS("dmi:*:svnSIEMENSAG:*");