629 lines
16 KiB
C
629 lines
16 KiB
C
/*
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* Copyright (c) 2015 Intel Corporation.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/**
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* @file Driver for PCAL9535A I2C-based GPIO driver.
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*/
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#include <errno.h>
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#include <kernel.h>
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#include <device.h>
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#include <init.h>
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#include <sys/util.h>
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#include <drivers/gpio.h>
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#include <drivers/i2c.h>
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#include "gpio_pcal9535a.h"
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#define LOG_LEVEL CONFIG_GPIO_LOG_LEVEL
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#include <logging/log.h>
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LOG_MODULE_REGISTER(gpio_pcal9535a);
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/* Register definitions */
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#define REG_INPUT_PORT0 0x00
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#define REG_INPUT_PORT1 0x01
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#define REG_OUTPUT_PORT0 0x02
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#define REG_OUTPUT_PORT1 0x03
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#define REG_POL_INV_PORT0 0x04
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#define REG_POL_INV_PORT1 0x05
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#define REG_CONF_PORT0 0x06
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#define REG_CONG_PORT1 0x07
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#define REG_OUT_DRV_STRENGTH_PORT0_L 0x40
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#define REG_OUT_DRV_STRENGTH_PORT0_H 0x41
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#define REG_OUT_DRV_STRENGTH_PORT1_L 0x42
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#define REG_OUT_DRV_STRENGTH_PORT1_H 0x43
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#define REG_INPUT_LATCH_PORT0 0x44
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#define REG_INPUT_LATCH_PORT1 0x45
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#define REG_PUD_EN_PORT0 0x46
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#define REG_PUD_EN_PORT1 0x47
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#define REG_PUD_SEL_PORT0 0x48
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#define REG_PUD_SEL_PORT1 0x49
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#define REG_INT_MASK_PORT0 0x4A
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#define REG_INT_MASK_PORT1 0x4B
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#define REG_INT_STATUS_PORT0 0x4C
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#define REG_INT_STATUS_PORT1 0x4D
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#define REG_OUTPUT_PORT_CONF 0x4F
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/**
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* @brief Check to see if a I2C master is identified for communication.
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*
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* @param dev Device struct.
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* @return 1 if I2C master is identified, 0 if not.
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*/
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static inline int has_i2c_master(struct device *dev)
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{
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struct gpio_pcal9535a_drv_data * const drv_data =
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(struct gpio_pcal9535a_drv_data * const)dev->driver_data;
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struct device * const i2c_master = drv_data->i2c_master;
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if (i2c_master) {
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return 1;
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} else {
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return 0;
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}
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}
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/**
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* @brief Read both port 0 and port 1 registers of certain register function.
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*
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* Given the register in reg, read the pair of port 0 and port 1.
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*
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* @param dev Device struct of the PCAL9535A.
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* @param reg Register to read (the PORT0 of the pair of registers).
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* @param buf Buffer to read data into.
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*
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* @return 0 if successful, failed otherwise.
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*/
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static int read_port_regs(struct device *dev, u8_t reg,
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union gpio_pcal9535a_port_data *buf)
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{
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const struct gpio_pcal9535a_config * const config =
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dev->config->config_info;
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struct gpio_pcal9535a_drv_data * const drv_data =
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(struct gpio_pcal9535a_drv_data * const)dev->driver_data;
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struct device * const i2c_master = drv_data->i2c_master;
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u16_t i2c_addr = config->i2c_slave_addr;
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int ret;
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ret = i2c_burst_read(i2c_master, i2c_addr, reg, buf->byte, 2);
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if (ret) {
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LOG_ERR("PCAL9535A[0x%X]: error reading register 0x%X (%d)",
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i2c_addr, reg, ret);
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goto error;
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}
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LOG_DBG("PCAL9535A[0x%X]: Read: REG[0x%X] = 0x%X, REG[0x%X] = 0x%X",
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i2c_addr, reg, buf->byte[0], (reg + 1), buf->byte[1]);
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error:
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return ret;
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}
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/**
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* @brief Write both port 0 and port 1 registers of certain register function.
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*
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* Given the register in reg, write the pair of port 0 and port 1.
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*
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* @param dev Device struct of the PCAL9535A.
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* @param reg Register to write into (the PORT0 of the pair of registers).
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* @param buf Buffer to write data from.
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*
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* @return 0 if successful, failed otherwise.
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*/
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static int write_port_regs(struct device *dev, u8_t reg,
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union gpio_pcal9535a_port_data *buf)
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{
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const struct gpio_pcal9535a_config * const config =
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dev->config->config_info;
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struct gpio_pcal9535a_drv_data * const drv_data =
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(struct gpio_pcal9535a_drv_data * const)dev->driver_data;
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struct device * const i2c_master = drv_data->i2c_master;
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u16_t i2c_addr = config->i2c_slave_addr;
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int ret;
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LOG_DBG("PCAL9535A[0x%X]: Write: REG[0x%X] = 0x%X, REG[0x%X] = "
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"0x%X", i2c_addr, reg, buf->byte[0], (reg + 1),
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buf->byte[1]);
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ret = i2c_reg_write_byte(i2c_master, i2c_addr, reg, buf->byte[0]);
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if (ret) {
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LOG_ERR("PCAL9535A[0x%X]: error writing from register 0x%X "
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"(%d)", i2c_addr, reg, ret);
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}
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ret = i2c_reg_write_byte(i2c_master, i2c_addr, reg+1, buf->byte[1]);
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if (ret) {
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LOG_ERR("PCAL9535A[0x%X]: error writing from register 0x%X "
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"(%d)", i2c_addr, reg, ret);
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}
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return ret;
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}
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/**
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* @brief Setup the pin direction (input or output)
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*
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* @param dev Device struct of the PCAL9535A
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* @param access_op Access operation (pin or port)
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* @param pin The pin number
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* @param flags Flags of pin or port
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*
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* @return 0 if successful, failed otherwise
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*/
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static int setup_pin_dir(struct device *dev, int access_op,
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u32_t pin, int flags)
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{
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struct gpio_pcal9535a_drv_data * const drv_data =
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(struct gpio_pcal9535a_drv_data * const)dev->driver_data;
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union gpio_pcal9535a_port_data *port = &drv_data->reg_cache.dir;
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u16_t bit_mask;
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u16_t new_value = 0U;
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int ret;
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switch (access_op) {
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case GPIO_ACCESS_BY_PIN:
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bit_mask = 1 << pin;
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/* Config 0 == output, 1 == input */
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if ((flags & GPIO_DIR_MASK) == GPIO_DIR_IN) {
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new_value = 1 << pin;
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}
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port->all &= ~bit_mask;
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port->all |= new_value;
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break;
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case GPIO_ACCESS_BY_PORT:
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/* Config 0 == output, 1 == input */
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if ((flags & GPIO_DIR_MASK) == GPIO_DIR_IN) {
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port->all = 0xFFFF;
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} else {
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port->all = 0x0;
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}
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break;
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default:
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ret = -ENOTSUP;
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goto done;
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}
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ret = write_port_regs(dev, REG_CONF_PORT0, port);
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done:
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return ret;
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}
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/**
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* @brief Setup the pin pull up/pull down status
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*
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* @param dev Device struct of the PCAL9535A
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* @param access_op Access operation (pin or port)
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* @param pin The pin number
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* @param flags Flags of pin or port
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*
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* @return 0 if successful, failed otherwise
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*/
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static int setup_pin_pullupdown(struct device *dev, int access_op,
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u32_t pin, int flags)
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{
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struct gpio_pcal9535a_drv_data * const drv_data =
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(struct gpio_pcal9535a_drv_data * const)dev->driver_data;
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union gpio_pcal9535a_port_data *port;
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u16_t bit_mask;
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u16_t new_value = 0U;
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int ret;
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/* If disabling pull up/down, there is no need to set the selection
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* register. Just go straight to disabling.
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*/
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if ((flags & GPIO_PUD_MASK) == GPIO_PUD_NORMAL) {
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goto en_dis;
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}
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/* Setup pin pull up or pull down */
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port = &drv_data->reg_cache.pud_sel;
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switch (access_op) {
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case GPIO_ACCESS_BY_PIN:
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bit_mask = 1 << pin;
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/* pull down == 0, pull up == 1*/
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if ((flags & GPIO_PUD_MASK) == GPIO_PUD_PULL_UP) {
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new_value = 1 << pin;
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}
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port->all &= ~bit_mask;
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port->all |= new_value;
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break;
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case GPIO_ACCESS_BY_PORT:
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/* pull down == 0, pull up == 1*/
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if ((flags & GPIO_PUD_MASK) == GPIO_PUD_PULL_UP) {
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port->all = 0xFFFF;
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} else {
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port->all = 0x0;
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}
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break;
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default:
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ret = -ENOTSUP;
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goto done;
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}
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ret = write_port_regs(dev, REG_PUD_SEL_PORT0, port);
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if (ret) {
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goto done;
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}
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en_dis:
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/* enable/disable pull up/down */
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port = &drv_data->reg_cache.pud_en;
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switch (access_op) {
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case GPIO_ACCESS_BY_PIN:
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bit_mask = 1 << pin;
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if ((flags & GPIO_PUD_MASK) != GPIO_PUD_NORMAL) {
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new_value = 1 << pin;
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}
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port->all &= ~bit_mask;
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port->all |= new_value;
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break;
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case GPIO_ACCESS_BY_PORT:
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if ((flags & GPIO_PUD_MASK) != GPIO_PUD_NORMAL) {
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port->all = 0xFFFF;
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} else {
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port->all = 0x0;
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}
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break;
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default:
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ret = -ENOTSUP;
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goto done;
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}
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ret = write_port_regs(dev, REG_PUD_EN_PORT0, port);
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done:
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return ret;
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}
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/**
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* @brief Setup the polarity of pin or port
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*
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* @param dev Device struct of the PCAL9535A
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* @param access_op Access operation (pin or port)
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* @param pin The pin number
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* @param flags Flags of pin or port
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*
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* @return 0 if successful, failed otherwise
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*/
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static int setup_pin_polarity(struct device *dev, int access_op,
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u32_t pin, int flags)
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{
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struct gpio_pcal9535a_drv_data * const drv_data =
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(struct gpio_pcal9535a_drv_data * const)dev->driver_data;
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union gpio_pcal9535a_port_data *port = &drv_data->reg_cache.pol_inv;
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u16_t bit_mask;
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u16_t new_value = 0U;
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int ret;
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switch (access_op) {
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case GPIO_ACCESS_BY_PIN:
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bit_mask = BIT(pin);
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/* normal == 0, invert == 1 */
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if ((flags & GPIO_POL_MASK) == GPIO_POL_INV) {
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new_value = BIT(pin);
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}
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port->all &= ~bit_mask;
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port->all |= new_value;
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break;
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case GPIO_ACCESS_BY_PORT:
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/* normal == 0, invert == 1 */
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if ((flags & GPIO_POL_MASK) == GPIO_POL_INV) {
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port->all = 0xFFFF;
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} else {
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port->all = 0x0;
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}
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break;
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default:
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ret = -ENOTSUP;
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goto done;
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}
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ret = write_port_regs(dev, REG_POL_INV_PORT0, port);
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if (!ret) {
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drv_data->out_pol_inv = port->all;
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}
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done:
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return ret;
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}
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/**
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* @brief Configure pin or port
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*
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* @param dev Device struct of the PCAL9535A
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* @param access_op Access operation (pin or port)
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* @param pin The pin number
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* @param flags Flags of pin or port
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*
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* @return 0 if successful, failed otherwise
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*/
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static int gpio_pcal9535a_config(struct device *dev, int access_op,
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u32_t pin, int flags)
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{
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int ret;
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#if (CONFIG_GPIO_LOG_LEVEL >= LOG_LEVEL_DEBUG)
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const struct gpio_pcal9535a_config * const config =
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dev->config->config_info;
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u16_t i2c_addr = config->i2c_slave_addr;
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#endif
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if (flags & GPIO_INT) {
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return -ENOTSUP;
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}
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if (!has_i2c_master(dev)) {
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return -EINVAL;
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}
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ret = setup_pin_dir(dev, access_op, pin, flags);
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if (ret) {
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LOG_ERR("PCAL9535A[0x%X]: error setting pin direction (%d)",
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i2c_addr, ret);
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goto done;
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}
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ret = setup_pin_polarity(dev, access_op, pin, flags);
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if (ret) {
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LOG_ERR("PCAL9535A[0x%X]: error setting pin polarity (%d)",
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i2c_addr, ret);
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goto done;
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}
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ret = setup_pin_pullupdown(dev, access_op, pin, flags);
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if (ret) {
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LOG_ERR("PCAL9535A[0x%X]: error setting pin pull up/down "
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"(%d)", i2c_addr, ret);
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goto done;
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}
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done:
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return ret;
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}
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/**
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* @brief Set the pin or port output
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*
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* @param dev Device struct of the PCAL9535A
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* @param access_op Access operation (pin or port)
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* @param pin The pin number
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* @param value Value to set (0 or 1)
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*
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* @return 0 if successful, failed otherwise
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*/
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static int gpio_pcal9535a_write(struct device *dev, int access_op,
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u32_t pin, u32_t value)
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{
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struct gpio_pcal9535a_drv_data * const drv_data =
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(struct gpio_pcal9535a_drv_data * const)dev->driver_data;
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union gpio_pcal9535a_port_data *port = &drv_data->reg_cache.output;
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u16_t bit_mask;
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u16_t new_value;
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int ret;
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if (!has_i2c_master(dev)) {
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return -EINVAL;
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}
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/* Invert input value for pins configurated as active low. */
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switch (access_op) {
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case GPIO_ACCESS_BY_PIN:
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bit_mask = BIT(pin);
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new_value = (value << pin) & bit_mask;
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new_value ^= (drv_data->out_pol_inv & bit_mask);
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new_value &= bit_mask;
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port->all &= ~bit_mask;
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port->all |= new_value;
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break;
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case GPIO_ACCESS_BY_PORT:
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port->all = value;
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bit_mask = drv_data->out_pol_inv;
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new_value = value & bit_mask;
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new_value ^= drv_data->out_pol_inv;
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new_value &= bit_mask;
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port->all &= ~bit_mask;
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port->all |= new_value;
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break;
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default:
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ret = -ENOTSUP;
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goto done;
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}
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ret = write_port_regs(dev, REG_OUTPUT_PORT0, port);
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done:
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return ret;
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}
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/**
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* @brief Read the pin or port status
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*
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* @param dev Device struct of the PCAL9535A
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* @param access_op Access operation (pin or port)
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* @param pin The pin number
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* @param value Value of input pin(s)
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*
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* @return 0 if successful, failed otherwise
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*/
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static int gpio_pcal9535a_read(struct device *dev, int access_op,
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u32_t pin, u32_t *value)
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{
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union gpio_pcal9535a_port_data buf;
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int ret;
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if (!has_i2c_master(dev)) {
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return -EINVAL;
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}
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ret = read_port_regs(dev, REG_INPUT_PORT0, &buf);
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if (ret != 0) {
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goto done;
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}
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switch (access_op) {
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case GPIO_ACCESS_BY_PIN:
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*value = (buf.all >> pin) & 0x01;
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break;
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case GPIO_ACCESS_BY_PORT:
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*value = buf.all;
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break;
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default:
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ret = -ENOTSUP;
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break;
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}
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done:
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return ret;
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}
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static const struct gpio_driver_api gpio_pcal9535a_drv_api_funcs = {
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.config = gpio_pcal9535a_config,
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.write = gpio_pcal9535a_write,
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.read = gpio_pcal9535a_read,
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};
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|
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/**
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* @brief Initialization function of PCAL9535A
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*
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* @param dev Device struct
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* @return 0 if successful, failed otherwise.
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*/
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static int gpio_pcal9535a_init(struct device *dev)
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{
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const struct gpio_pcal9535a_config * const config =
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dev->config->config_info;
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struct gpio_pcal9535a_drv_data * const drv_data =
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(struct gpio_pcal9535a_drv_data * const)dev->driver_data;
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struct device *i2c_master;
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|
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/* Find out the device struct of the I2C master */
|
|
i2c_master = device_get_binding((char *)config->i2c_master_dev_name);
|
|
if (!i2c_master) {
|
|
return -EINVAL;
|
|
}
|
|
drv_data->i2c_master = i2c_master;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Initialization for PCAL9535A_0 */
|
|
#ifdef CONFIG_GPIO_PCAL9535A_0
|
|
static const struct gpio_pcal9535a_config gpio_pcal9535a_0_cfg = {
|
|
.i2c_master_dev_name = CONFIG_GPIO_PCAL9535A_0_I2C_MASTER_DEV_NAME,
|
|
.i2c_slave_addr = CONFIG_GPIO_PCAL9535A_0_I2C_ADDR,
|
|
};
|
|
|
|
static struct gpio_pcal9535a_drv_data gpio_pcal9535a_0_drvdata = {
|
|
/* Default for registers according to datasheet */
|
|
.reg_cache.output = { .all = 0xFFFF },
|
|
.reg_cache.pol_inv = { .all = 0x0 },
|
|
.reg_cache.dir = { .all = 0xFFFF },
|
|
.reg_cache.pud_en = { .all = 0x0 },
|
|
.reg_cache.pud_sel = { .all = 0xFFFF },
|
|
};
|
|
|
|
/* This has to init after I2C master */
|
|
DEVICE_AND_API_INIT(gpio_pcal9535a_0, CONFIG_GPIO_PCAL9535A_0_DEV_NAME,
|
|
gpio_pcal9535a_init,
|
|
&gpio_pcal9535a_0_drvdata, &gpio_pcal9535a_0_cfg,
|
|
POST_KERNEL, CONFIG_GPIO_PCAL9535A_INIT_PRIORITY,
|
|
&gpio_pcal9535a_drv_api_funcs);
|
|
|
|
#endif /* CONFIG_GPIO_PCAL9535A_0 */
|
|
|
|
/* Initialization for PCAL9535A_1 */
|
|
#ifdef CONFIG_GPIO_PCAL9535A_1
|
|
static const struct gpio_pcal9535a_config gpio_pcal9535a_1_cfg = {
|
|
.i2c_master_dev_name = CONFIG_GPIO_PCAL9535A_1_I2C_MASTER_DEV_NAME,
|
|
.i2c_slave_addr = CONFIG_GPIO_PCAL9535A_1_I2C_ADDR,
|
|
};
|
|
|
|
static struct gpio_pcal9535a_drv_data gpio_pcal9535a_1_drvdata = {
|
|
/* Default for registers according to datasheet */
|
|
.reg_cache.output = { .all = 0xFFFF },
|
|
.reg_cache.pol_inv = { .all = 0x0 },
|
|
.reg_cache.dir = { .all = 0xFFFF },
|
|
.reg_cache.pud_en = { .all = 0x0 },
|
|
.reg_cache.pud_sel = { .all = 0xFFFF },
|
|
};
|
|
|
|
/* This has to init after I2C master */
|
|
DEVICE_AND_API_INIT(gpio_pcal9535a_1, CONFIG_GPIO_PCAL9535A_1_DEV_NAME,
|
|
gpio_pcal9535a_init,
|
|
&gpio_pcal9535a_1_drvdata, &gpio_pcal9535a_1_cfg,
|
|
POST_KERNEL, CONFIG_GPIO_PCAL9535A_INIT_PRIORITY,
|
|
&gpio_pcal9535a_drv_api_funcs);
|
|
|
|
#endif /* CONFIG_GPIO_PCAL9535A_1 */
|
|
|
|
/* Initialization for PCAL9535A_2 */
|
|
#ifdef CONFIG_GPIO_PCAL9535A_2
|
|
static const struct gpio_pcal9535a_config gpio_pcal9535a_2_cfg = {
|
|
.i2c_master_dev_name = CONFIG_GPIO_PCAL9535A_2_I2C_MASTER_DEV_NAME,
|
|
.i2c_slave_addr = CONFIG_GPIO_PCAL9535A_2_I2C_ADDR,
|
|
};
|
|
|
|
static struct gpio_pcal9535a_drv_data gpio_pcal9535a_2_drvdata = {
|
|
/* Default for registers according to datasheet */
|
|
.reg_cache.output = { .all = 0xFFFF },
|
|
.reg_cache.pol_inv = { .all = 0x0 },
|
|
.reg_cache.dir = { .all = 0xFFFF },
|
|
.reg_cache.pud_en = { .all = 0x0 },
|
|
.reg_cache.pud_sel = { .all = 0xFFFF },
|
|
};
|
|
|
|
/* This has to init after I2C master */
|
|
DEVICE_AND_API_INIT(gpio_pcal9535a_2, CONFIG_GPIO_PCAL9535A_2_DEV_NAME,
|
|
gpio_pcal9535a_init,
|
|
&gpio_pcal9535a_2_drvdata, &gpio_pcal9535a_2_cfg,
|
|
POST_KERNEL, CONFIG_GPIO_PCAL9535A_INIT_PRIORITY,
|
|
&gpio_pcal9535a_drv_api_funcs);
|
|
|
|
#endif /* CONFIG_GPIO_PCAL9535A_2 */
|
|
|
|
/* Initialization for PCAL9535A_3 */
|
|
#ifdef CONFIG_GPIO_PCAL9535A_3
|
|
static const struct gpio_pcal9535a_config gpio_pcal9535a_3_cfg = {
|
|
.i2c_master_dev_name = CONFIG_GPIO_PCAL9535A_3_I2C_MASTER_DEV_NAME,
|
|
.i2c_slave_addr = CONFIG_GPIO_PCAL9535A_3_I2C_ADDR,
|
|
};
|
|
|
|
static struct gpio_pcal9535a_drv_data gpio_pcal9535a_3_drvdata = {
|
|
/* Default for registers according to datasheet */
|
|
.reg_cache.output = { .all = 0xFFFF },
|
|
.reg_cache.pol_inv = { .all = 0x0 },
|
|
.reg_cache.dir = { .all = 0xFFFF },
|
|
.reg_cache.pud_en = { .all = 0x0 },
|
|
.reg_cache.pud_sel = { .all = 0xFFFF },
|
|
};
|
|
|
|
/* This has to init after I2C master */
|
|
DEVICE_AND_API_INIT(gpio_pcal9535a_3, CONFIG_GPIO_PCAL9535A_3_DEV_NAME,
|
|
gpio_pcal9535a_init,
|
|
&gpio_pcal9535a_3_drvdata, &gpio_pcal9535a_3_cfg,
|
|
POST_KERNEL, CONFIG_GPIO_PCAL9535A_INIT_PRIORITY,
|
|
&gpio_pcal9535a_drv_api_funcs);
|
|
|
|
#endif /* CONFIG_GPIO_PCAL9535A_3 */
|