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