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author | Randall Spangler <rspangler@chromium.org> | 2013-04-01 10:56:33 -0700 |
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committer | ChromeBot <chrome-bot@google.com> | 2013-04-02 14:12:57 -0700 |
commit | bdd16f82069f9e07e9a9e3008c318d9581ce0664 (patch) | |
tree | 16287a843f975c9505636dcc13fbaef50cb08f9a /common/lid_switch.c | |
parent | 50c53c0d542d6fc3184db09a35196b4c702536c5 (diff) | |
download | chrome-ec-bdd16f82069f9e07e9a9e3008c318d9581ce0664.tar.gz |
Split lid switch code out of switch.c to its own file
This will allow ARM code to use the same lid switch code (in a subsequent CL).
BUG=chrome-os-partner:18343
BRANCH=none
TEST=open lid; system boots. close lid; system suspends. open lid; resumes.
Change-Id: I83536a3ad24c4446dccf8a6b6e296756659070a8
Signed-off-by: Randall Spangler <rspangler@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/47043
Reviewed-by: Bill Richardson <wfrichar@chromium.org>
Diffstat (limited to 'common/lid_switch.c')
-rw-r--r-- | common/lid_switch.c | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/common/lid_switch.c b/common/lid_switch.c new file mode 100644 index 0000000000..68c049e52c --- /dev/null +++ b/common/lid_switch.c @@ -0,0 +1,126 @@ +/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved. + * Use of this source code is governed by a BSD-style license that can be + * found in the LICENSE file. + */ + +/* Lid switch module for Chrome EC */ + +#include "common.h" +#include "console.h" +#include "gpio.h" +#include "hooks.h" +#include "host_command.h" +#include "timer.h" +#include "util.h" + +/* Console output macros */ +#define CPUTS(outstr) cputs(CC_SWITCH, outstr) +#define CPRINTF(format, args...) cprintf(CC_SWITCH, format, ## args) + +#define LID_DEBOUNCE_US (30 * MSEC) /* Debounce time for lid switch */ + +static int debounced_lid_open; /* Debounced lid state */ + +/** + * Get raw lid switch state. + * + * @return 1 if lid is open, 0 if closed. + */ +static int raw_lid_open(void) +{ + return gpio_get_level(GPIO_LID_SWITCHn) ? 1 : 0; +} + +/** + * Handle lid open. + */ +static void lid_switch_open(void) +{ + if (debounced_lid_open) { + CPRINTF("[%T lid already open]\n"); + return; + } + + CPRINTF("[%T lid open]\n"); + debounced_lid_open = 1; + hook_notify(HOOK_LID_CHANGE); + host_set_single_event(EC_HOST_EVENT_LID_OPEN); +} + +/** + * Handle lid close. + */ +static void lid_switch_close(void) +{ + if (!debounced_lid_open) { + CPRINTF("[%T lid already closed]\n"); + return; + } + + CPRINTF("[%T lid close]\n"); + debounced_lid_open = 0; + hook_notify(HOOK_LID_CHANGE); + host_set_single_event(EC_HOST_EVENT_LID_CLOSED); +} + +int lid_is_open(void) +{ + return debounced_lid_open; +} + +/** + * Lid switch initialization code + */ +static void lid_init(void) +{ + if (raw_lid_open()) + debounced_lid_open = 1; + + /* Enable interrupts, now that we've initialized */ + gpio_enable_interrupt(GPIO_LID_SWITCHn); +} +DECLARE_HOOK(HOOK_INIT, lid_init, HOOK_PRIO_INIT_LID); + +/** + * Handle debounced lid switch changing state. + */ +static void lid_change_deferred(void) +{ + const int new_open = raw_lid_open(); + + /* If lid hasn't changed state, nothing to do */ + if (new_open == debounced_lid_open) + return; + + if (new_open) + lid_switch_open(); + else + lid_switch_close(); +} +DECLARE_DEFERRED(lid_change_deferred); + +void lid_interrupt(enum gpio_signal signal) +{ + /* Reset lid debounce time */ + hook_call_deferred(lid_change_deferred, LID_DEBOUNCE_US); +} + +static int command_lidopen(int argc, char **argv) +{ + lid_switch_open(); + return EC_SUCCESS; +} +DECLARE_CONSOLE_COMMAND(lidopen, command_lidopen, + NULL, + "Simulate lid open", + NULL); + +static int command_lidclose(int argc, char **argv) +{ + lid_switch_close(); + return EC_SUCCESS; +} +DECLARE_CONSOLE_COMMAND(lidclose, command_lidclose, + NULL, + "Simulate lid close", + NULL); |