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From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
Cc: linux-input@vger.kernel.org, devicetree@vger.kernel.org,
	Dmitry Torokhov <dmitry.torokhov@gmail.com>,
	Rob Herring <robh+dt@kernel.org>, Jiri Slaby <jslaby@suse.com>,
	kernel@collabora.com
Subject: Re: [PATCH 3/6] tty/sysrq: Allow configurable SysRq key
Date: Mon, 11 May 2020 18:18:01 +0200	[thread overview]
Message-ID: <20200511161801.GA2221063@kroah.com> (raw)
In-Reply-To: <20200511135918.8203-4-andrzej.p@collabora.com>

On Mon, May 11, 2020 at 03:59:15PM +0200, Andrzej Pietrasiewicz wrote:
> There are existing machines which don't have SysRq key, e.g. chromebooks.
> This patch allows configuring which key acts as SysRq. The value is passed
> with sysrq's module parameter.
> 
> Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
> ---
>  drivers/tty/sysrq.c | 14 +++++++++++---
>  1 file changed, 11 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/tty/sysrq.c b/drivers/tty/sysrq.c
> index 93202fc24308..ebad9799fdc0 100644
> --- a/drivers/tty/sysrq.c
> +++ b/drivers/tty/sysrq.c
> @@ -604,6 +604,7 @@ EXPORT_SYMBOL(handle_sysrq);
>  
>  #ifdef CONFIG_INPUT
>  static int sysrq_reset_downtime_ms;
> +static unsigned short sysrq_key = KEY_SYSRQ;
>  
>  /* Simple translation table for the SysRq keys */
>  static const unsigned char sysrq_xlate[KEY_CNT] =
> @@ -735,10 +736,10 @@ static void sysrq_reinject_alt_sysrq(struct work_struct *work)
>  
>  		/* Simulate press and release of Alt + SysRq */
>  		input_inject_event(handle, EV_KEY, alt_code, 1);
> -		input_inject_event(handle, EV_KEY, KEY_SYSRQ, 1);
> +		input_inject_event(handle, EV_KEY, sysrq_key, 1);
>  		input_inject_event(handle, EV_SYN, SYN_REPORT, 1);
>  
> -		input_inject_event(handle, EV_KEY, KEY_SYSRQ, 0);
> +		input_inject_event(handle, EV_KEY, sysrq_key, 0);
>  		input_inject_event(handle, EV_KEY, alt_code, 0);
>  		input_inject_event(handle, EV_SYN, SYN_REPORT, 1);
>  
> @@ -770,6 +771,7 @@ static bool sysrq_handle_keypress(struct sysrq_state *sysrq,
>  		}
>  		break;
>  
> +key_sysrq:
>  	case KEY_SYSRQ:
>  		if (value == 1 && sysrq->alt != KEY_RESERVED) {
>  			sysrq->active = true;
> @@ -790,11 +792,15 @@ static bool sysrq_handle_keypress(struct sysrq_state *sysrq,
>  		 * triggering print screen function.
>  		 */
>  		if (sysrq->active)
> -			clear_bit(KEY_SYSRQ, sysrq->handle.dev->key);
> +			clear_bit(sysrq_key, sysrq->handle.dev->key);
>  
>  		break;
>  
>  	default:
> +		/* handle non-default sysrq key */
> +		if (code == sysrq_key)
> +			goto key_sysrq;
> +
>  		if (sysrq->active && value && value != 2) {
>  			sysrq->need_reinject = false;
>  			__handle_sysrq(sysrq_xlate[code], true);
> @@ -995,6 +1001,8 @@ module_param_array_named(reset_seq, sysrq_reset_seq, sysrq_reset_seq,
>  
>  module_param_named(sysrq_downtime_ms, sysrq_reset_downtime_ms, int, 0644);
>  
> +module_param(sysrq_key, ushort, 0644);

No documentation of this new module parameter?

:(


  reply	other threads:[~2020-05-11 16:29 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-11 13:59 [PATCH 0/6] Magic SysRq extensions Andrzej Pietrasiewicz
2020-05-11 13:59 ` [PATCH 1/6] tty/sysrq: Remove linux,sysrq-reset-seq Andrzej Pietrasiewicz
2020-05-11 17:58   ` Dmitry Torokhov
2020-05-12  9:21     ` Andrzej Pietrasiewicz
2020-05-11 13:59 ` [PATCH 2/6] dt-bindings: input: Remove linux,sysrq-reset-seq binding Andrzej Pietrasiewicz
2020-05-11 13:59 ` [PATCH 3/6] tty/sysrq: Allow configurable SysRq key Andrzej Pietrasiewicz
2020-05-11 16:18   ` Greg Kroah-Hartman [this message]
2020-05-11 18:01   ` Dmitry Torokhov
2020-05-12  9:46     ` Andrzej Pietrasiewicz
2020-06-19 16:28     ` [PATCH] tty/sysrq: Add alternative " Andrzej Pietrasiewicz
2020-06-21 21:21       ` Pavel Machek
2020-06-26 11:07         ` Andrzej Pietrasiewicz
2020-06-22  6:24       ` Jiri Slaby
2020-06-26 11:51         ` Andrzej Pietrasiewicz
2020-07-09  5:05       ` Dmitry Torokhov
2020-07-09  8:15         ` Andrzej Pietrasiewicz
2020-05-11 13:59 ` [PATCH 4/6] tty/sysrq: Extend the sysrq_key_table to cover capital letters Andrzej Pietrasiewicz
2020-05-11 13:59 ` [PATCH 5/6] tty/sysrq: Add configurable handler to signal a process Andrzej Pietrasiewicz
2020-05-11 16:20   ` Greg Kroah-Hartman
2020-05-14  9:06   ` kbuild test robot
2020-05-11 13:59 ` [PATCH 6/6] tty/sysrq: Add configurable handler to execute a compound action Andrzej Pietrasiewicz
2020-05-11 16:21   ` Greg Kroah-Hartman
2020-05-11 18:29     ` Dmitry Torokhov
2020-05-12  9:15       ` Andrzej Pietrasiewicz

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