[PATCH] sandbox: cros_ec: Basic support for EC_CMD_GET_NEXT_EVENT

[Alper Nebi Yasak <alpernebiyasak@gmail.com>]

On 10/11/2020 20:08, Heinrich Schuchardt wrote:
> On 10.11.20 15:00, Alper Nebi Yasak wrote:
>> Since commit 690079767803 ("cros_ec: Support keyboard scanning with
>> EC_CMD_GET_NEXT_EVENT") the cros-ec-keyb driver has started using this
>> command, but the sandbox EC emulator does not recognize it and
>> continuously prints:
>>
>>     ** Unknown EC command 0x67
>>
>> This patch makes the sandbox driver send basic responses to the command,
>> but the response only supports keyboard scans for now.
>>
>> Fixes: 690079767803 ("cros_ec: Support keyboard scanning with EC_CMD_GET_NEXT_EVENT")
>> Reported-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
>> Signed-off-by: Alper Nebi Yasak <alpernebiyasak@gmail.com>
>> ---
>> This doesn't test the -EC_RES_UNAVAILABLE part, which looks like an
>> event queue on the EC side. As far as I understand sandbox is getting a
>> single keyboard state from SDL after discarding pending events. I think
>> things would need to be hooked into sandbox_sdl_poll_events, looks
>> possible but harder.
>>
>> Also, now that this command would work, the fallback to the old one
>> would never trigger and wouldn't be tested.
> 
> Should some of the comment above be merged into the commit message?

Yeah, probably. I just defaulted to the notes since I'd be writing in an
informal tone and was not sure if leaving those as future work is OK.

> Tested-by: Heinrich Schuchardt <xypron.glpk@gmx.de>

Thanks.

>>
>>  drivers/misc/cros_ec_sandbox.c | 8 ++++++++
>>  1 file changed, 8 insertions(+)
>>
>> diff --git a/drivers/misc/cros_ec_sandbox.c b/drivers/misc/cros_ec_sandbox.c
>> index a191f061b898..d72db3eace98 100644
>> --- a/drivers/misc/cros_ec_sandbox.c
>> +++ b/drivers/misc/cros_ec_sandbox.c
>> @@ -460,6 +460,14 @@ static int process_cmd(struct ec_state *ec,
>>  	case EC_CMD_ENTERING_MODE:
>>  		len = 0;
>>  		break;
>> +	case EC_CMD_GET_NEXT_EVENT: {
>> +		struct ec_response_get_next_event *resp = resp_data;
>> +
>> +		resp->event_type = EC_MKBP_EVENT_KEY_MATRIX;
>> +		cros_ec_keyscan(ec, resp->data.key_matrix);
>> +		len = sizeof(*resp);
>> +		break;
>> +	}
>>  	default:
>>  		printf("   ** Unknown EC command %#02x\n", req_hdr->command);
>>  		return -1;
>>
>