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-rw-r--r--drivers/platform/x86/simatic-ipc.c150
1 files changed, 150 insertions, 0 deletions
diff --git a/drivers/platform/x86/simatic-ipc.c b/drivers/platform/x86/simatic-ipc.c
new file mode 100644
index 000000000..b3622419c
--- /dev/null
+++ b/drivers/platform/x86/simatic-ipc.c
@@ -0,0 +1,150 @@
+// 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_IPCBX_39A, SIMATIC_IPC_DEVICE_227G, SIMATIC_IPC_DEVICE_227G},
+ {SIMATIC_IPC_IPCPX_39A, SIMATIC_IPC_DEVICE_NONE, 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:*");