@@ -1623,6 +1623,19 @@ config NIC7018_WDT
To compile this driver as a module, choose M here: the module will be
called nic7018_wdt.
+config AAEON_IWMI_WDT
+ tristate "AAEON Watchdog Timer"
+ depends on ASUS_WMI
+ depends on UBUNTU_ODM_DRIVERS
+ select MFD_AAEON
+ help
+ This is the driver for the hardware watchdog on Single Board
+ Computers produced by AAEON.Say `Y' here to support its built-in
+ watchdog timer feature.
+
+ This driver leverages the ASUS WMI interface to access device
+ resources.
+
# M68K Architecture
config M54xx_WATCHDOG
@@ -145,6 +145,7 @@ obj-$(CONFIG_INTEL_MEI_WDT) += mei_wdt.o
obj-$(CONFIG_NI903X_WDT) += ni903x_wdt.o
obj-$(CONFIG_NIC7018_WDT) += nic7018_wdt.o
obj-$(CONFIG_MLX_WDT) += mlx_wdt.o
+obj-$(CONFIG_AAEON_IWMI_WDT) += wdt_aaeon.o
# M68K Architecture
obj-$(CONFIG_M54xx_WATCHDOG) += m54xx_wdt.o
new file mode 100644
@@ -0,0 +1,242 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * AAEON WDT driver
+ *
+ * Author: Edward Lin <edward1_lin@aaeon.com.tw>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/acpi.h>
+#include <linux/fs.h>
+#include <linux/err.h>
+#include <linux/miscdevice.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/notifier.h>
+#include <linux/platform_data/x86/asus-wmi.h>
+#include <linux/platform_device.h>
+#include <linux/reboot.h>
+#include <linux/uaccess.h>
+#include <linux/watchdog.h>
+
+#define AAEON_WMI_MGMT_GUID "97845ED0-4E6D-11DE-8A39-0800200C9A66"
+#define WMI_WDT_GETMAX_METHOD_ID 0x00020000
+#define WMI_WDT_GETVALUE_METHOD_ID 0x00020001
+#define WMI_WDT_SETANDSTOP_METHOD_ID 0x00020002
+
+#define WMI_WDT_SUPPORTED_DEVICE_ID \
+ 0x12 /* Dev_Id for WDT_WMI supported or not */
+#define WMI_WDT_GETMAX_DEVICE_ID 0x10 /* Dev_Id for WDT_WMI get Max timeout */
+#define WMI_WDT_STOP_DEVICE_ID 0x00 /* Dev_Id for WDT_WMI stop watchdog*/
+
+/* Default values */
+#define WATCHDOG_TIMEOUT 60000 /* 1 minute default timeout */
+#define WATCHDOG_MAX_TIMEOUT (60000 * 255) /* WD_TIME is a byte long */
+#define WATCHDOG_PULSE_WIDTH 5000 /* default pulse width for watchdog signal */
+
+static const int max_timeout = WATCHDOG_MAX_TIMEOUT;
+static int timeout = WATCHDOG_TIMEOUT; /* default timeout in seconds */
+module_param(timeout, int, 0);
+MODULE_PARM_DESC(timeout, "Initial watchdog timeout in mini-seconds");
+
+static bool nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, bool, 0444);
+MODULE_PARM_DESC(nowayout, " Disable watchdog shutdown on close");
+
+/* Wdog internal data information */
+struct watchdog_data {
+ unsigned long opened; /* driver open state */
+ struct mutex lock; /* concurrency control */
+ char expect_close; /* controlled close */
+ struct watchdog_info ident; /* wdog information*/
+ unsigned short timeout; /* current wdog timeout */
+ u8 timer_val; /* content for the WD_TIME register */
+ char minutes_mode;
+ u8 pulse_val; /* pulse width flag */
+ char pulse_mode; /* enable pulse output mode? */
+ char caused_reboot;/* last reboot was by the watchdog */
+};
+
+static long aaeon_watchdog_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg);
+static int aaeon_watchdog_notify_sys(struct notifier_block *this,
+ unsigned long code, void *unused);
+
+static struct watchdog_data watchdog = {
+ .lock = __MUTEX_INITIALIZER(watchdog.lock),
+};
+
+/* /dev/watchdog api available options */
+static const struct file_operations watchdog_fops = {
+ .owner = THIS_MODULE,
+ .unlocked_ioctl = aaeon_watchdog_ioctl,
+};
+
+static struct miscdevice watchdog_miscdev = {
+ .minor = WATCHDOG_MINOR,
+ .name = "watchdog",
+ .fops = &watchdog_fops,
+};
+
+static struct notifier_block watchdog_notifier = {
+ .notifier_call = aaeon_watchdog_notify_sys,
+};
+
+/* Internal Configuration functions */
+static int aaeon_watchdog_set_timeout(int timeout)
+{
+ int err = 0;
+ u32 retval, dev_id = timeout;
+
+ if (timeout <= 0 || timeout > max_timeout) {
+ pr_debug("watchdog timeout out of range\n");
+ return -EINVAL;
+ }
+
+ mutex_lock(&watchdog.lock);
+ err = asus_wmi_evaluate_method(WMI_WDT_SETANDSTOP_METHOD_ID,
+ dev_id, 0, &retval);
+ mutex_unlock(&watchdog.lock);
+
+ return err;
+}
+
+static int aaeon_watchdog_get_timeout(void)
+{
+ int err = 0;
+ u32 retval;
+
+ if (timeout <= 0 || timeout > max_timeout) {
+ pr_debug("watchdog timeout out of range\n");
+ return -EINVAL;
+ }
+ mutex_lock(&watchdog.lock);
+ err = asus_wmi_evaluate_method(WMI_WDT_GETVALUE_METHOD_ID,
+ 0, 0, &retval);
+ mutex_unlock(&watchdog.lock);
+
+ return err ? err : retval;
+}
+
+static int aaeon_watchdog_stop(void)
+{
+ int err = 0;
+
+ mutex_lock(&watchdog.lock);
+ err = asus_wmi_evaluate_method(WMI_WDT_SETANDSTOP_METHOD_ID,
+ 0, 0, NULL);
+ mutex_unlock(&watchdog.lock);
+
+ return err;
+}
+
+static int aaeon_watchdog_get_maxsupport(void)
+{
+ int err;
+ u32 retval;
+
+ mutex_lock(&watchdog.lock);
+ err = asus_wmi_evaluate_method(WMI_WDT_GETMAX_METHOD_ID,
+ WMI_WDT_GETMAX_DEVICE_ID,
+ 0, &retval);
+ mutex_unlock(&watchdog.lock);
+
+ return err ? err : retval;
+
+}
+
+static long aaeon_watchdog_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ int new_timeout;
+
+ union {
+ struct watchdog_info __user *ident;
+ int __user *i;
+ } uarg;
+
+ uarg.i = (int __user *) arg;
+ switch (cmd) {
+ case WDIOC_SETTIMEOUT:
+ if (get_user(new_timeout, uarg.i))
+ return -EFAULT;
+ if (aaeon_watchdog_set_timeout(new_timeout))
+ return -EINVAL;
+ return 0;
+ case WDIOC_GETTIMEOUT:
+ return aaeon_watchdog_get_timeout();
+ case WDIOS_DISABLECARD:
+ return aaeon_watchdog_stop();
+ case WDIOC_GETSUPPORT:
+ return aaeon_watchdog_get_maxsupport();
+ default:
+ return -ENOTTY;
+ }
+}
+
+static int aaeon_watchdog_notify_sys(struct notifier_block *this,
+ unsigned long code, void *unused)
+{
+ if (code == SYS_DOWN || code == SYS_HALT)
+ aaeon_watchdog_stop();
+ return NOTIFY_DONE;
+}
+
+static int aaeon_wdt_probe(struct platform_device *pdev)
+{
+ int err = 0;
+ int retval = 0;
+
+ pr_debug("aaeon watchdog device probe!\n");
+ if (!wmi_has_guid(AAEON_WMI_MGMT_GUID)) {
+ pr_debug("AAEON Management GUID not found\n");
+ return -ENODEV;
+ }
+ err = asus_wmi_evaluate_method(WMI_WDT_GETMAX_METHOD_ID,
+ WMI_WDT_SUPPORTED_DEVICE_ID, 0, &retval);
+ if (err)
+ goto exit;
+
+ /*
+ * This driver imitates the old type SIO watchdog driver to
+ * provide the basic control for watchdog functions and only
+ * access by customized userspace tool
+ */
+ err = misc_register(&watchdog_miscdev);
+ if (err) {
+ pr_debug(" cannot register miscdev on minor=%d\n",
+ watchdog_miscdev.minor);
+ goto exit;
+ }
+
+ err = register_reboot_notifier(&watchdog_notifier);
+ if (err)
+ goto exit_miscdev;
+
+ if (nowayout)
+ __module_get(THIS_MODULE);
+
+ return 0;
+
+exit_miscdev:
+ misc_deregister(&watchdog_miscdev);
+exit:
+ return err;
+}
+
+static struct platform_driver aaeon_wdt_driver = {
+ .driver = {
+ .name = "wdt-aaeon",
+ },
+};
+
+module_platform_driver_probe(aaeon_wdt_driver, aaeon_wdt_probe);
+
+MODULE_ALIAS("platform:wdt-aaeon");
+MODULE_DESCRIPTION("AAEON WDT Driver");
+MODULE_AUTHOR("Edward Lin <edward1_lin@aaeon.com.tw>");
+MODULE_LICENSE("GPL v2");