platform/chrome: cros_ec: Report EC panic as uevent

Create a uevent when an EC panic is detected. This will allow udev rules
to trigger when a panic occurs. For example, a udev rule could be added to
capture an EC coredump. This approach avoids the need to stuff all the
processing into the driver.

Signed-off-by: Rob Barnes <robbarnes@google.com>
Reviewed-by: Prashant Malani <pmalani@chromium.org>
Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>
Link: https://lore.kernel.org/r/20230509232624.3120347-1-robbarnes@google.com

diff --git a/drivers/platform/chrome/cros_ec_lpc.c b/drivers/platform/chrome/cros_ec_lpc.c
index 68bba0fcafab37144041e05a9eaec161098c0ad2..2b1ce3e1abf2eb832305ddf0a7879d99cd18e98f 100644 (file)
--- a/drivers/platform/chrome/cros_ec_lpc.c
+++ b/drivers/platform/chrome/cros_ec_lpc.c
@@ -16,6 +16,7 @@
 #include <linux/delay.h>
 #include <linux/io.h>
 #include <linux/interrupt.h>
+#include <linux/kobject.h>
 #include <linux/module.h>
 #include <linux/platform_data/cros_ec_commands.h>
 #include <linux/platform_data/cros_ec_proto.h>
@@ -315,6 +316,7 @@ static int cros_ec_lpc_readmem(struct cros_ec_device *ec, unsigned int offset,
 
 static void cros_ec_lpc_acpi_notify(acpi_handle device, u32 value, void *data)
 {
+       static const char *env[] = { "ERROR=PANIC", NULL };
        struct cros_ec_device *ec_dev = data;
        bool ec_has_more_events;
        int ret;
@@ -324,6 +326,7 @@ static void cros_ec_lpc_acpi_notify(acpi_handle device, u32 value, void *data)
        if (value == ACPI_NOTIFY_CROS_EC_PANIC) {
                dev_emerg(ec_dev->dev, "CrOS EC Panic Reported. Shutdown is imminent!");
                blocking_notifier_call_chain(&ec_dev->panic_notifier, 0, ec_dev);
+               kobject_uevent_env(&ec_dev->dev->kobj, KOBJ_CHANGE, (char **)env);
                /* Begin orderly shutdown. Force shutdown after 1 second. */
                hw_protection_shutdown("CrOS EC Panic", 1000);
                /* Do not query for other events after a panic is reported */