drivers/platform/x86/simatic-ipc.c

   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_IPCBX_39A, SIMATIC_IPC_DEVICE_227G, SIMATIC_IPC_DEVICE_227G},
  50         {SIMATIC_IPC_IPCPX_39A, SIMATIC_IPC_DEVICE_NONE, SIMATIC_IPC_DEVICE_227G},
  51 };
  52
  53 static int register_platform_devices(u32 station_id)
  54 {
  55         u8 ledmode = SIMATIC_IPC_DEVICE_NONE;
  56         u8 wdtmode = SIMATIC_IPC_DEVICE_NONE;
  57         char *pdevname = KBUILD_MODNAME "_leds";
  58         int i;
  59
  60         platform_data.devmode = SIMATIC_IPC_DEVICE_NONE;
  61
  62         for (i = 0; i < ARRAY_SIZE(device_modes); i++) {
  63                 if (device_modes[i].station_id == station_id) {
  64                         ledmode = device_modes[i].led_mode;
  65                         wdtmode = device_modes[i].wdt_mode;
  66                         break;
  67                 }
  68         }
  69
  70         if (ledmode != SIMATIC_IPC_DEVICE_NONE) {
  71                 if (ledmode == SIMATIC_IPC_DEVICE_127E)
  72                         pdevname = KBUILD_MODNAME "_leds_gpio_apollolake";
  73                 if (ledmode == SIMATIC_IPC_DEVICE_227G)
  74                         pdevname = KBUILD_MODNAME "_leds_gpio_f7188x";
  75                 platform_data.devmode = ledmode;
  76                 ipc_led_platform_device =
  77                         platform_device_register_data(NULL,
  78                                 pdevname, PLATFORM_DEVID_NONE,
  79                                 &platform_data,
  80                                 sizeof(struct simatic_ipc_platform));
  81                 if (IS_ERR(ipc_led_platform_device))
  82                         return PTR_ERR(ipc_led_platform_device);
  83
  84                 pr_debug("device=%s created\n",
  85                          ipc_led_platform_device->name);
  86         }
  87
  88         if (wdtmode == SIMATIC_IPC_DEVICE_227G) {
  89                 request_module("w83627hf_wdt");
  90                 return 0;
  91         }
  92
  93         if (wdtmode != SIMATIC_IPC_DEVICE_NONE) {
  94                 platform_data.devmode = wdtmode;
  95                 ipc_wdt_platform_device =
  96                         platform_device_register_data(NULL,
  97                                 KBUILD_MODNAME "_wdt", PLATFORM_DEVID_NONE,
  98                                 &platform_data,
  99                                 sizeof(struct simatic_ipc_platform));
 100                 if (IS_ERR(ipc_wdt_platform_device))
 101                         return PTR_ERR(ipc_wdt_platform_device);
 102
 103                 pr_debug("device=%s created\n",
 104                          ipc_wdt_platform_device->name);
 105         }
 106
 107         if (ledmode == SIMATIC_IPC_DEVICE_NONE &&
 108             wdtmode == SIMATIC_IPC_DEVICE_NONE) {
 109                 pr_warn("unsupported IPC detected, station id=%08x\n",
 110                         station_id);
 111                 return -EINVAL;
 112         }
 113
 114         return 0;
 115 }
 116
 117 static int __init simatic_ipc_init_module(void)
 118 {
 119         const struct dmi_system_id *match;
 120         u32 station_id;
 121         int err;
 122
 123         match = dmi_first_match(simatic_ipc_whitelist);
 124         if (!match)
 125                 return 0;
 126
 127         err = dmi_walk(simatic_ipc_find_dmi_entry_helper, &station_id);
 128
 129         if (err || station_id == SIMATIC_IPC_INVALID_STATION_ID) {
 130                 pr_warn("DMI entry %d not found\n", SIMATIC_IPC_DMI_ENTRY_OEM);
 131                 return 0;
 132         }
 133
 134         return register_platform_devices(station_id);
 135 }
 136
 137 static void __exit simatic_ipc_exit_module(void)
 138 {
 139         platform_device_unregister(ipc_led_platform_device);
 140         ipc_led_platform_device = NULL;
 141
 142         platform_device_unregister(ipc_wdt_platform_device);
 143         ipc_wdt_platform_device = NULL;
 144 }
 145
 146 module_init(simatic_ipc_init_module);
 147 module_exit(simatic_ipc_exit_module);
 148
 149 MODULE_LICENSE("GPL v2");
 150 MODULE_AUTHOR("Gerd Haeussler <gerd.haeussler.ext@siemens.com>");
 151 MODULE_ALIAS("dmi:*:svnSIEMENSAG:*");