1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Siemens SIMATIC IPC platform driver
4 *
5 * Copyright (c) Siemens AG, 2018-2021
6 *
7 * Authors:
8 * Henning Schild <henning.schild@siemens.com>
9 * Jan Kiszka <jan.kiszka@siemens.com>
10 * Gerd Haeussler <gerd.haeussler.ext@siemens.com>
11 */
12
13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14
15 #include <linux/dmi.h>
16 #include <linux/kernel.h>
17 #include <linux/module.h>
18 #include <linux/pci.h>
19 #include <linux/platform_data/x86/simatic-ipc.h>
20 #include <linux/platform_device.h>
21
22 static struct platform_device *ipc_led_platform_device;
23 static struct platform_device *ipc_wdt_platform_device;
24
25 static const struct dmi_system_id simatic_ipc_whitelist[] = {
26 {
27 .matches = {
28 DMI_MATCH(DMI_SYS_VENDOR, "SIEMENS AG"),
29 },
30 },
31 {}
32 };
33
34 static struct simatic_ipc_platform platform_data;
35
36 static struct {
37 u32 station_id;
38 u8 led_mode;
39 u8 wdt_mode;
40 } device_modes[] = {
41 {SIMATIC_IPC_IPC127E, SIMATIC_IPC_DEVICE_127E, SIMATIC_IPC_DEVICE_NONE},
42 {SIMATIC_IPC_IPC227D, SIMATIC_IPC_DEVICE_227D, SIMATIC_IPC_DEVICE_NONE},
43 {SIMATIC_IPC_IPC227E, SIMATIC_IPC_DEVICE_427E, SIMATIC_IPC_DEVICE_227E},
44 {SIMATIC_IPC_IPC227G, SIMATIC_IPC_DEVICE_227G, SIMATIC_IPC_DEVICE_227G},
45 {SIMATIC_IPC_IPC277E, SIMATIC_IPC_DEVICE_NONE, SIMATIC_IPC_DEVICE_227E},
46 {SIMATIC_IPC_IPC427D, SIMATIC_IPC_DEVICE_427E, SIMATIC_IPC_DEVICE_NONE},
47 {SIMATIC_IPC_IPC427E, SIMATIC_IPC_DEVICE_427E, SIMATIC_IPC_DEVICE_427E},
48 {SIMATIC_IPC_IPC477E, SIMATIC_IPC_DEVICE_NONE, SIMATIC_IPC_DEVICE_427E},
49 {SIMATIC_IPC_IPC427G, SIMATIC_IPC_DEVICE_227G, SIMATIC_IPC_DEVICE_227G},
50 };
51
register_platform_devices(u32 station_id)52 static int register_platform_devices(u32 station_id)
53 {
54 u8 ledmode = SIMATIC_IPC_DEVICE_NONE;
55 u8 wdtmode = SIMATIC_IPC_DEVICE_NONE;
56 char *pdevname = KBUILD_MODNAME "_leds";
57 int i;
58
59 platform_data.devmode = SIMATIC_IPC_DEVICE_NONE;
60
61 for (i = 0; i < ARRAY_SIZE(device_modes); i++) {
62 if (device_modes[i].station_id == station_id) {
63 ledmode = device_modes[i].led_mode;
64 wdtmode = device_modes[i].wdt_mode;
65 break;
66 }
67 }
68
69 if (ledmode != SIMATIC_IPC_DEVICE_NONE) {
70 if (ledmode == SIMATIC_IPC_DEVICE_127E ||
71 ledmode == SIMATIC_IPC_DEVICE_227G)
72 pdevname = KBUILD_MODNAME "_leds_gpio";
73 platform_data.devmode = ledmode;
74 ipc_led_platform_device =
75 platform_device_register_data(NULL,
76 pdevname, PLATFORM_DEVID_NONE,
77 &platform_data,
78 sizeof(struct simatic_ipc_platform));
79 if (IS_ERR(ipc_led_platform_device))
80 return PTR_ERR(ipc_led_platform_device);
81
82 pr_debug("device=%s created\n",
83 ipc_led_platform_device->name);
84 }
85
86 if (wdtmode == SIMATIC_IPC_DEVICE_227G) {
87 request_module("w83627hf_wdt");
88 return 0;
89 }
90
91 if (wdtmode != SIMATIC_IPC_DEVICE_NONE) {
92 platform_data.devmode = wdtmode;
93 ipc_wdt_platform_device =
94 platform_device_register_data(NULL,
95 KBUILD_MODNAME "_wdt", PLATFORM_DEVID_NONE,
96 &platform_data,
97 sizeof(struct simatic_ipc_platform));
98 if (IS_ERR(ipc_wdt_platform_device))
99 return PTR_ERR(ipc_wdt_platform_device);
100
101 pr_debug("device=%s created\n",
102 ipc_wdt_platform_device->name);
103 }
104
105 if (ledmode == SIMATIC_IPC_DEVICE_NONE &&
106 wdtmode == SIMATIC_IPC_DEVICE_NONE) {
107 pr_warn("unsupported IPC detected, station id=%08x\n",
108 station_id);
109 return -EINVAL;
110 }
111
112 return 0;
113 }
114
simatic_ipc_init_module(void)115 static int __init simatic_ipc_init_module(void)
116 {
117 const struct dmi_system_id *match;
118 u32 station_id;
119 int err;
120
121 match = dmi_first_match(simatic_ipc_whitelist);
122 if (!match)
123 return 0;
124
125 err = dmi_walk(simatic_ipc_find_dmi_entry_helper, &station_id);
126
127 if (err || station_id == SIMATIC_IPC_INVALID_STATION_ID) {
128 pr_warn("DMI entry %d not found\n", SIMATIC_IPC_DMI_ENTRY_OEM);
129 return 0;
130 }
131
132 return register_platform_devices(station_id);
133 }
134
simatic_ipc_exit_module(void)135 static void __exit simatic_ipc_exit_module(void)
136 {
137 platform_device_unregister(ipc_led_platform_device);
138 ipc_led_platform_device = NULL;
139
140 platform_device_unregister(ipc_wdt_platform_device);
141 ipc_wdt_platform_device = NULL;
142 }
143
144 module_init(simatic_ipc_init_module);
145 module_exit(simatic_ipc_exit_module);
146
147 MODULE_LICENSE("GPL v2");
148 MODULE_AUTHOR("Gerd Haeussler <gerd.haeussler.ext@siemens.com>");
149 MODULE_ALIAS("dmi:*:svnSIEMENSAG:*");
150
