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@xxxxxxxxxxxxx>
> ---
> 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?
:(
