87 lines
2.2 KiB
C
87 lines
2.2 KiB
C
/* Copyright 2013-2014 Google Corp.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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* implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <stdint.h>
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#include "ec/config.h"
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#include "ec/gpio.h"
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int ec_gpio_setup(EcGpioPort port, uint8_t pin,
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int is_output, int pullup_enable)
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{
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uint8_t ddr_reg;
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if (pin > 7) {
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return -1;
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}
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/* Set data direction */
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ec_outb(EC_GPIO_INDEX,
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port * EC_GPIO_PORT_SKIP + EC_GPIO_DDR_OFFSET);
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ddr_reg = ec_inb(EC_GPIO_DATA);
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if (is_output) {
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ddr_reg |= (1 << pin);
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} else {
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ddr_reg &= ~(1 << pin);
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}
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ec_outb(EC_GPIO_DATA, ddr_reg);
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/* Set pullup enable for output GPOs */
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if (is_output)
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{
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uint8_t pup_reg;
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ec_outb(EC_GPIO_INDEX,
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port * EC_GPIO_PORT_SKIP + EC_GPIO_PUP_OFFSET);
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pup_reg = ec_inb(EC_GPIO_DATA);
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if (pullup_enable) {
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pup_reg |= (1 << pin);
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} else {
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pup_reg &= ~(1 << pin);
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}
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ec_outb(EC_GPIO_DATA, pup_reg);
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}
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return 0;
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}
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int ec_gpio_read(EcGpioPort port, uint8_t pin)
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{
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uint8_t pin_reg;
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if (pin > 7) {
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return -1;
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}
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ec_outb(EC_GPIO_INDEX,
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port * EC_GPIO_PORT_SKIP + EC_GPIO_PIN_OFFSET);
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pin_reg = ec_inb(EC_GPIO_DATA);
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return !!(pin_reg & (1 << pin));
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}
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int ec_gpio_set(EcGpioPort port, uint8_t pin, int val)
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{
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uint8_t data_reg;
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if (pin > 7) {
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return -1;
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}
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ec_outb(EC_GPIO_INDEX,
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port * EC_GPIO_PORT_SKIP + EC_GPIO_DATA_OFFSET);
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data_reg = ec_inb(EC_GPIO_DATA);
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if (val) {
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data_reg |= (1 << pin);
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} else {
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data_reg &= ~(1 << pin);
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}
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ec_outb(EC_GPIO_DATA, data_reg);
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return 0;
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}
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