[PATCH v2] platform/chrome: cros_ec: Report EC panic as uevent

[Rob Barnes <robbarnes@google.com>]

Create a uevent when an EC panic is detected. This will allow udev rules
to trigger when a panic occurs. E.g. 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>
---
Changlog since v1:
- Inline uevent call

 drivers/platform/chrome/cros_ec_lpc.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/platform/chrome/cros_ec_lpc.c b/drivers/platform/chrome/cros_ec_lpc.c
index b399f7cbf17be..fbce9898dc7e1 100644
--- 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>
@@ -322,8 +323,11 @@ static void cros_ec_lpc_acpi_notify(acpi_handle device, u32 value, void *data)
 	ec_dev->last_event_time = cros_ec_get_time_ns();
 
 	if (value == ACPI_NOTIFY_CROS_EC_PANIC) {
+		static const char *env[] = { "ERROR=PANIC", NULL };
 		dev_emerg(ec_dev->dev, "CrOS EC Panic Reported. Shutdown is imminent!");
 		blocking_notifier_call_chain(&ec_dev->panic_notifier, 0, ec_dev);
+		/* Publish uevent for userspace handlers */
+		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 */
-- 
2.39.2