mirror of
https://github.com/Telecominfraproject/OpenCellular.git
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d1ed75815e
This implements a new API for EC modules to define MKBP event sources and send MKBP event to the AP. Also, a new host command EC_CMD_GET_NEXT_EVENT is added for the AP to query the pending MKBP events. Each event type may have custom event data sent along with the event. BRANCH=None BUG=chrome-os-partner:33194 TEST=Enable MKBP event on Ryu. Set a host event from EC console, run 'ectool nextevent', and see MKBP event 0x01 (HOST_EVENT) and the set host event. Signed-off-by: Vic Yang <victoryang@chromium.org> Change-Id: I28a1b7e826bcc102bbe39016c9bb3e37d125664c Reviewed-on: https://chromium-review.googlesource.com/224905 Reviewed-by: Randall Spangler <rspangler@chromium.org>
96 lines
2.0 KiB
C
96 lines
2.0 KiB
C
/* Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*
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* Event handling in MKBP keyboard protocol
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*/
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#include "atomic.h"
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#include "gpio.h"
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#include "host_command.h"
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#include "link_defs.h"
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#include "mkbp_event.h"
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#include "util.h"
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static uint32_t events;
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static void set_event(uint8_t event_type)
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{
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atomic_or(&events, 1 << event_type);
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}
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static void clear_event(uint8_t event_type)
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{
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atomic_clear(&events, 1 << event_type);
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}
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static int event_is_set(uint8_t event_type)
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{
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return events & (1 << event_type);
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}
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/**
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* Assert host keyboard interrupt line.
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*/
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static void set_host_interrupt(int active)
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{
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/* interrupt host by using active low EC_INT signal */
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gpio_set_level(GPIO_EC_INT, !active);
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}
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void mkbp_send_event(uint8_t event_type)
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{
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set_event(event_type);
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set_host_interrupt(1);
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}
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static int mkbp_get_next_event(struct host_cmd_handler_args *args)
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{
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static int last;
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int i, data_size, evt;
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uint8_t *resp = args->response;
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const struct mkbp_event_source *src;
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/*
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* Find the next event to service. We do this in a round-robin
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* way to make sure no event gets starved.
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*/
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for (i = 0; i < EC_MKBP_EVENT_COUNT; ++i)
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if (event_is_set((last + i) % EC_MKBP_EVENT_COUNT))
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break;
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if (i == EC_MKBP_EVENT_COUNT)
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return EC_RES_ERROR;
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evt = (i + last) % EC_MKBP_EVENT_COUNT;
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last = evt + 1;
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/*
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* Clear the event before retrieving the event data in case the
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* event source wants to send the same event.
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*/
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clear_event(evt);
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for (src = __mkbp_evt_srcs; src < __mkbp_evt_srcs_end; ++src)
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if (src->event_type == evt)
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break;
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if (src == __mkbp_evt_srcs_end)
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return EC_RES_ERROR;
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resp[0] = evt; /* Event type */
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data_size = src->get_data(resp + 1);
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if (data_size < 0)
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return EC_RES_ERROR;
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args->response_size = 1 + data_size;
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if (!events)
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set_host_interrupt(0);
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return EC_RES_SUCCESS;
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}
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DECLARE_HOST_COMMAND(EC_CMD_GET_NEXT_EVENT,
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mkbp_get_next_event,
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EC_VER_MASK(0));
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