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Commit e6eba3fa authored by Rajat Jain's avatar Rajat Jain Committed by Dmitry Torokhov
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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: default avatarRajat Jain <rajatja@google.com>
Acked-by: default avatarLee Jones <lee.jones@linaro.org>
Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
parent f6f08c55

drivers/input/keyboard/cros_ec_keyb.c

+7 −0
Original line number Diff line number Diff line
@@ -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:

		/*

include/linux/mfd/cros_ec_commands.h

+4 −0
Original line number Diff line number Diff line
@@ -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 {