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

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Date:   Mon, 3 Apr 2017 11:54:31 -0700
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Lee Jones <lee.jones@...aro.org>
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 Mon, Apr 03, 2017 at 10:56:59AM +0100, Lee Jones wrote:
> 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>

Applied, thank you.

> 
> > > ---
> > >  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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-- 
Dmitry