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94acd01e0c
In order to wake the chips from STOP/SLEEP mode with a touch, we need to put the two chips in correct state before going into STOP/SLEEP mode. Also, when one of the chips wakes up, it needs to wake the other chip with GPIO interrupt. This CL implements the necessary methods and also adds a sample routine that put the chips in STOP mode and wait for a touch using the implemented methods. BUG=None TEST=Build and boot. Touch the panel and see the response in console. BRANCH=None Change-Id: Ia5f7df8b550ee2459bcae1840f8a2717c8d947ce Signed-off-by: Vic Yang <victoryang@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/204482 Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
78 lines
1.7 KiB
C
78 lines
1.7 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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/* Touch scanning module */
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#ifndef __BOARD_KEYBORG_TOUCH_SCAN_H
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#define __BOARD_KEYBORG_TOUCH_SCAN_H
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enum pin_type {
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PIN_ROW,
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PIN_COL,
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PIN_PD,
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PIN_Z,
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};
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/* 8-bit window */
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#define ADC_WINDOW_POS 2
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/* Threshold for each cell */
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#define THRESHOLD 35
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/* Threshold for entire column */
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#define COL_THRESHOLD 16
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/* The span width of active columns */
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#define COL_SPAN 5 /* Must not exceed 15 */
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/* ADC speed */
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#define ADC_SMPR_VAL 0x2 /* 13.5 cycles */
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#define ADC_SMPL_CYCLE_2 27
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#define ADC_QUNTZ_CYCLE_2 25 /* Quantization always takes 12.5 cycles */
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/* CPU clock is 4 times faster than ADC clock */
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#define ADC_SMPL_CPU_CYCLE (ADC_SMPL_CYCLE_2 * 2)
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struct ts_pin {
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uint8_t port_id; /* GPIO_A = 0, GPIO_B = 1, ... */
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uint8_t pin;
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};
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#define TS_GPIO_A 0
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#define TS_GPIO_B 1
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#define TS_GPIO_C 2
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#define TS_GPIO_D 3
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#define TS_GPIO_E 4
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#define TS_GPIO_F 5
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#define TS_GPIO_G 6
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#define TS_GPIO_H 7
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#define TS_GPIO_I 8
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extern const struct ts_pin row_pins[];
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extern const struct ts_pin col_pins[];
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#define ROW_COUNT 41
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#define COL_COUNT 60
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/* Initialize touch scan module */
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void touch_scan_init(void);
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/* Start scanning on the slave. This is called by SPI command handler. */
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void touch_scan_slave_start(void);
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/**
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* Initiate full matrix scan on the master. This also sends SPI command
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* to the slave.
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*/
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int touch_scan_full_matrix(void);
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/* Configure touch scan module to interrupt on touch. */
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void touch_scan_enable_interrupt(void);
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/* Disable touch scan interrupt. */
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void touch_scan_disable_interrupt(void);
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#endif /* __BOARD_KEYBORG_TOUCH_SCAN_H */
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