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snow: add keypress noise suppression

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This was implemented for Daisy a long time ago, but left out on Snow
due to some confusion.

GPIO remapping is already handled because PD1 and PD0 (which is used
for ENTERING_RW) are remapped together. So all we need here is the
board_keyboard_suppress_noise() function definition which gets
called from the keyboard scanning code whenever a change is detected.

BUG=none
TEST=Verified using a scope that CODEC_INT line is driven
     when a key is pressed (15us pulse)

Signed-off-by: David Hendricks <dhendrix@chromium.org>
Change-Id: Ifd358eb89a9547c4f4b9536b8922c93d2c3b77a0
Reviewed-on: https://gerrit.chromium.org/gerrit/28989
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
This commit is contained in:
David Hendricks
2012-07-31 18:12:11 -07:00
committed by Gerrit
parent 903dc92ec1
commit 985ff40583
1 changed files with 7 additions and 0 deletions
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7
board/snow/board.c
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@@ -144,6 +144,13 @@ void board_interrupt_host(int active)
gpio_set_level(GPIO_EC_INT, !active);
}
void board_keyboard_suppress_noise(void)
{
/* notify audio codec of keypress for noise suppression */
gpio_set_level(GPIO_CODEC_INT, 0);
gpio_set_level(GPIO_CODEC_INT, 1);
}
enum {
/* Time between requesting bus and deciding that we have it */
BUS_SLEW_DELAY_US = 10,