144 lines
3.5 KiB
C
144 lines
3.5 KiB
C
/* Copyright 2013 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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* Raw keyboard I/O layer for STM32
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*
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* To make this code portable, we rely heavily on looping over the keyboard
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* input and output entries in the board's gpio_list[]. Each set of inputs or
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* outputs must be listed in consecutive, increasing order so that scan loops
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* can iterate beginning at KB_IN00 or KB_OUT00 for however many GPIOs are
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* utilized (KEYBOARD_ROWS or KEYBOARD_COLS_MAX).
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*/
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#include "gpio.h"
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#include "keyboard_config.h"
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#include "keyboard_raw.h"
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#include "keyboard_scan.h"
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#include "registers.h"
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#include "task.h"
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#include "util.h"
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/* Mask of external interrupts on input lines */
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static unsigned int irq_mask;
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static const uint32_t kb_out_ports[] = { KB_OUT_PORT_LIST };
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static void set_irq_mask(void)
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{
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int i;
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for (i = GPIO_KB_IN00; i < GPIO_KB_IN00 + KEYBOARD_ROWS; i++)
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irq_mask |= gpio_list[i].mask;
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}
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void keyboard_raw_init(void)
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{
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/* Determine EXTI_PR mask to use for the board */
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set_irq_mask();
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/* Ensure interrupts are disabled in EXTI_PR */
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keyboard_raw_enable_interrupt(0);
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}
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void keyboard_raw_task_start(void)
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{
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/* Enable interrupts for keyboard matrix inputs */
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gpio_enable_interrupt(GPIO_KB_IN00);
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gpio_enable_interrupt(GPIO_KB_IN01);
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gpio_enable_interrupt(GPIO_KB_IN02);
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gpio_enable_interrupt(GPIO_KB_IN03);
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gpio_enable_interrupt(GPIO_KB_IN04);
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gpio_enable_interrupt(GPIO_KB_IN05);
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gpio_enable_interrupt(GPIO_KB_IN06);
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gpio_enable_interrupt(GPIO_KB_IN07);
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}
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test_mockable void keyboard_raw_drive_column(int out)
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{
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int i, done = 0;
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for (i = 0; i < ARRAY_SIZE(kb_out_ports); i++) {
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uint32_t bsrr = 0;
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int j;
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for (j = GPIO_KB_OUT00; j <= GPIO_KB_OUT12; j++) {
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if (gpio_list[j].port != kb_out_ports[i])
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continue;
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if (out == KEYBOARD_COLUMN_ALL) {
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/* drive low (clear bit) */
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bsrr |= gpio_list[j].mask << 16;
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} else if (out == KEYBOARD_COLUMN_NONE) {
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/* put output in hi-Z state (set bit) */
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bsrr |= gpio_list[j].mask;
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} else if (j - GPIO_KB_OUT00 == out) {
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/*
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* Drive specified output low, others => hi-Z.
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*
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* To avoid conflict, tri-state all outputs
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* first, then assert specified output.
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*/
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keyboard_raw_drive_column(KEYBOARD_COLUMN_NONE);
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bsrr |= gpio_list[j].mask << 16;
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done = 1;
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break;
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}
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}
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#ifdef CONFIG_KEYBOARD_COL2_INVERTED
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if (bsrr & (gpio_list[GPIO_KB_OUT02].mask << 16 |
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gpio_list[GPIO_KB_OUT02].mask))
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bsrr ^= (gpio_list[GPIO_KB_OUT02].mask << 16 |
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gpio_list[GPIO_KB_OUT02].mask);
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#endif
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if (bsrr)
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STM32_GPIO_BSRR(kb_out_ports[i]) = bsrr;
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if (done)
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break;
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}
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}
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test_mockable int keyboard_raw_read_rows(void)
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{
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int i;
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unsigned int port, prev_port = 0;
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int state = 0;
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uint16_t port_val = 0;
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for (i = 0; i < KEYBOARD_ROWS; i++) {
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port = gpio_list[GPIO_KB_IN00 + i].port;
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if (port != prev_port) {
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port_val = STM32_GPIO_IDR(port);
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prev_port = port;
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}
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if (port_val & gpio_list[GPIO_KB_IN00 + i].mask)
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state |= 1 << i;
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}
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/* Invert it so 0=not pressed, 1=pressed */
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return state ^ 0xff;
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}
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void keyboard_raw_enable_interrupt(int enable)
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{
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if (enable) {
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/*
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* Assert all outputs would trigger un-wanted interrupts.
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* Clear them before enable interrupt.
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*/
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STM32_EXTI_PR |= irq_mask;
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STM32_EXTI_IMR |= irq_mask; /* 1: unmask interrupt */
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} else {
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STM32_EXTI_IMR &= ~irq_mask; /* 0: mask interrupts */
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}
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}
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void keyboard_raw_gpio_interrupt(enum gpio_signal signal)
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{
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task_wake(TASK_ID_KEYSCAN);
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}
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