linux-kernel - Re: [PATCH] input: cros_ec_keyb: Add an EC event for sysrq

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Date:   Mon, 3 Apr 2017 10:56:59 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        Rajat Jain <rajatja@...gle.com>, rajatxjain@...il.com,
        dtor@...gle.com
Subject: Re: [PATCH] input: cros_ec_keyb: Add an EC event for sysrq

On Sat, 01 Apr 2017, Dmitry Torokhov wrote:

> On Thu, Mar 30, 2017 at 03:18:07PM -0700, Rajat Jain wrote:
> > 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 <rajatja@...gle.com>
> 
> Lee, is it OK to route through my tree or you want to take it?

Looks trivial enough:

Acked-by: Lee Jones <lee.jones@...aro.org>

> > ---
> >  drivers/input/keyboard/cros_ec_keyb.c | 7 +++++++
> >  include/linux/mfd/cros_ec_commands.h  | 4 ++++
> >  2 files changed, 11 insertions(+)
> > 
> > diff --git a/drivers/input/keyboard/cros_ec_keyb.c b/drivers/input/keyboard/cros_ec_keyb.c
> > index 6a250d65f8fe..00a3a830cd3a 100644
> > --- 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
> > index f1ef6388c233..c93e7e0300ef 100644
> > --- a/include/linux/mfd/cros_ec_commands.h
> > +++ b/include/linux/mfd/cros_ec_commands.h
> > @@ -2041,6 +2041,9 @@ 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,
> >  };
> > @@ -2053,6 +2056,7 @@ union ec_response_get_next_data {
> >  
> >  	uint32_t   buttons;
> >  	uint32_t   switches;
> > +	uint32_t   sysrq;
> >  } __packed;
> >  
> >  struct ec_response_get_next_event {
> 

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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