Input: cros_ec_keyb - add an EC event for sysrq

Some form factors (detachables/tablets) may not have a keyboard and thus user may have to resort to using a defined EC UI to send sysrq(s) to the kernel in order to collect crash info etc. This UI typically is in the form of user pressing volume / power buttons in some specific sequence and for some specific time. Add a new EC event that allows EC to communicate the sysrq to the AP. (We're skipping event number 5 because it has been reserved for something else) Signed-off-by: Rajat Jain <[email protected]> Acked-by: Lee Jones <[email protected]> Signed-off-by: Dmitry Torokhov <[email protected]>
opendata26 · Apr 3, 2017 · e6eba3f · e6eba3f
1 parent f6f08c5
commit e6eba3f
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diff --git a/drivers/input/keyboard/cros_ec_keyb.c b/drivers/input/keyboard/cros_ec_keyb.c
@@ -30,6 +30,7 @@
 #include <linux/notifier.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
+#include <linux/sysrq.h>
 #include <linux/input/matrix_keypad.h>
 #include <linux/mfd/cros_ec.h>
 #include <linux/mfd/cros_ec_commands.h>
@@ -260,6 +261,12 @@ static int cros_ec_keyb_work(struct notifier_block *nb,
 				     ckdev->ec->event_size);
 		break;
 
+	case EC_MKBP_EVENT_SYSRQ:
+		val = get_unaligned_le32(&ckdev->ec->event_data.data.sysrq);
+		dev_dbg(ckdev->dev, "sysrq code from EC: %#x\n", val);
+		handle_sysrq(val);
+		break;
+
 	case EC_MKBP_EVENT_BUTTON:
 	case EC_MKBP_EVENT_SWITCH:
 		/*

diff --git a/include/linux/mfd/cros_ec_commands.h b/include/linux/mfd/cros_ec_commands.h
@@ -2040,6 +2040,9 @@ enum ec_mkbp_event {
 	/* The state of the switches have changed. */
 	EC_MKBP_EVENT_SWITCH = 4,
 
+	/* EC sent a sysrq command */
+	EC_MKBP_EVENT_SYSRQ = 6,
+
 	/* Number of MKBP events */
 	EC_MKBP_EVENT_COUNT,
 };
@@ -2052,6 +2055,7 @@ union ec_response_get_next_data {
 
 	uint32_t   buttons;
 	uint32_t   switches;
+	uint32_t   sysrq;
 } __packed;
 
 struct ec_response_get_next_event {