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zmk/app/drivers/gpio/gpio_mcp23017.c

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/*
* Copyright (c) 2020 Geanix ApS
*
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT microchip_mcp23017
/**
* @file Driver for MCP23017 SPI-based GPIO driver.
*/
#include <errno.h>
#include <kernel.h>
#include <device.h>
#include <init.h>
#include <sys/byteorder.h>
#include <drivers/gpio.h>
#include <drivers/i2c.h>
#include "gpio_mcp23017.h"
#define LOG_LEVEL CONFIG_GPIO_LOG_LEVEL
#include <logging/log.h>
LOG_MODULE_REGISTER(gpio_mcp23017);
/**
* @brief Read both port 0 and port 1 registers of certain register function.
*
* Given the register in reg, read the pair of port 0 and port 1.
*
* @param dev Device struct of the MCP23017.
* @param reg Register to read (the PORTA of the pair of registers).
* @param buf Buffer to read data into.
*
* @return 0 if successful, failed otherwise.
*/
static int read_port_regs(const struct device *dev, uint8_t reg, uint16_t *buf) {
const struct mcp23017_config *const config = dev->config;
struct mcp23017_drv_data *const drv_data = (struct mcp23017_drv_data *const)dev->data;
int ret;
uint16_t port_data;
uint8_t addr = config->slave;
ret = i2c_burst_read(drv_data->i2c, addr, reg, (uint8_t *)&port_data, sizeof(port_data));
if (ret) {
LOG_DBG("i2c_write_read FAIL %d\n", ret);
return ret;
}
*buf = sys_le16_to_cpu(port_data);
LOG_DBG("MCP23017: Read: REG[0x%X] = 0x%X, REG[0x%X] = 0x%X", reg, (*buf & 0xFF), (reg + 1),
(*buf >> 8));
return 0;
}
/**
* @brief Write both port 0 and port 1 registers of certain register function.
*
* Given the register in reg, write the pair of port 0 and port 1.
*
* @param dev Device struct of the MCP23017.
* @param reg Register to write into (the PORTA of the pair of registers).
* @param buf Buffer to write data from.
*
* @return 0 if successful, failed otherwise.
*/
static int write_port_regs(const struct device *dev, uint8_t reg, uint16_t value) {
const struct mcp23017_config *const config = dev->config;
struct mcp23017_drv_data *const drv_data = (struct mcp23017_drv_data *const)dev->data;
int ret;
uint16_t port_data;
LOG_DBG("MCP23017: Write: REG[0x%X] = 0x%X, REG[0x%X] = 0x%X", reg, (value & 0xFF), (reg + 1),
(value >> 8));
port_data = sys_cpu_to_le16(value);
ret = i2c_burst_write(drv_data->i2c, config->slave, reg, (uint8_t *)&port_data,
sizeof(port_data));
if (ret) {
LOG_DBG("i2c_write FAIL %d\n", ret);
return ret;
}
return 0;
}
/**
* @brief Setup the pin direction (input or output)
*
* @param dev Device struct of the MCP23017
* @param pin The pin number
* @param flags Flags of pin or port
*
* @return 0 if successful, failed otherwise
*/
static int setup_pin_dir(const struct device *dev, uint32_t pin, int flags) {
struct mcp23017_drv_data *const drv_data = (struct mcp23017_drv_data *const)dev->data;
uint16_t *dir = &drv_data->reg_cache.iodir;
uint16_t *output = &drv_data->reg_cache.gpio;
int ret;
if ((flags & GPIO_OUTPUT) != 0U) {
if ((flags & GPIO_OUTPUT_INIT_HIGH) != 0U) {
*output |= BIT(pin);
} else if ((flags & GPIO_OUTPUT_INIT_LOW) != 0U) {
*output &= ~BIT(pin);
}
*dir &= ~BIT(pin);
} else {
*dir |= BIT(pin);
}
ret = write_port_regs(dev, REG_GPIO_PORTA, *output);
if (ret != 0) {
return ret;
}
ret = write_port_regs(dev, REG_IODIR_PORTA, *dir);
return ret;
}
/**
* @brief Setup the pin pull up/pull down status
*
* @param dev Device struct of the MCP23017
* @param pin The pin number
* @param flags Flags of pin or port
*
* @return 0 if successful, failed otherwise
*/
static int setup_pin_pullupdown(const struct device *dev, uint32_t pin, int flags) {
struct mcp23017_drv_data *const drv_data = (struct mcp23017_drv_data *const)dev->data;
uint16_t port;
int ret;
/* Setup pin pull up or pull down */
port = drv_data->reg_cache.gppu;
/* pull down == 0, pull up == 1 */
if ((flags & GPIO_PULL_DOWN) != 0U) {
return -ENOTSUP;
}
WRITE_BIT(port, pin, (flags & GPIO_PULL_UP) != 0U);
ret = write_port_regs(dev, REG_GPPU_PORTA, port);
if (ret == 0) {
drv_data->reg_cache.gppu = port;
}
return ret;
}
static int mcp23017_config(const struct device *dev, gpio_pin_t pin, gpio_flags_t flags) {
struct mcp23017_drv_data *const drv_data = (struct mcp23017_drv_data *const)dev->data;
int ret;
/* Can't do SPI bus operations from an ISR */
if (k_is_in_isr()) {
return -EWOULDBLOCK;
}
k_sem_take(&drv_data->lock, K_FOREVER);
if ((flags & GPIO_OPEN_DRAIN) != 0U) {
ret = -ENOTSUP;
goto done;
};
ret = setup_pin_dir(dev, pin, flags);
if (ret) {
LOG_ERR("MCP23017: error setting pin direction (%d)", ret);
goto done;
}
ret = setup_pin_pullupdown(dev, pin, flags);
if (ret) {
LOG_ERR("MCP23017: error setting pin pull up/down (%d)", ret);
goto done;
}
done:
k_sem_give(&drv_data->lock);
return ret;
}
static int mcp23017_port_get_raw(const struct device *dev, uint32_t *value) {
struct mcp23017_drv_data *const drv_data = (struct mcp23017_drv_data *const)dev->data;
uint16_t buf;
int ret;
/* Can't do SPI bus operations from an ISR */
if (k_is_in_isr()) {
return -EWOULDBLOCK;
}
k_sem_take(&drv_data->lock, K_FOREVER);
ret = read_port_regs(dev, REG_GPIO_PORTA, &buf);
if (ret != 0) {
goto done;
}
*value = buf;
done:
k_sem_give(&drv_data->lock);
return ret;
}
static int mcp23017_port_set_masked_raw(const struct device *dev, uint32_t mask, uint32_t value) {
struct mcp23017_drv_data *const drv_data = (struct mcp23017_drv_data *const)dev->data;
uint16_t buf;
int ret;
/* Can't do SPI bus operations from an ISR */
if (k_is_in_isr()) {
return -EWOULDBLOCK;
}
k_sem_take(&drv_data->lock, K_FOREVER);
buf = drv_data->reg_cache.gpio;
buf = (buf & ~mask) | (mask & value);
ret = write_port_regs(dev, REG_GPIO_PORTA, buf);
if (ret == 0) {
drv_data->reg_cache.gpio = buf;
}
k_sem_give(&drv_data->lock);
return ret;
}
static int mcp23017_port_set_bits_raw(const struct device *dev, uint32_t mask) {
return mcp23017_port_set_masked_raw(dev, mask, mask);
}
static int mcp23017_port_clear_bits_raw(const struct device *dev, uint32_t mask) {
return mcp23017_port_set_masked_raw(dev, mask, 0);
}
static int mcp23017_port_toggle_bits(const struct device *dev, uint32_t mask) {
struct mcp23017_drv_data *const drv_data = (struct mcp23017_drv_data *const)dev->data;
uint16_t buf;
int ret;
/* Can't do SPI bus operations from an ISR */
if (k_is_in_isr()) {
return -EWOULDBLOCK;
}
k_sem_take(&drv_data->lock, K_FOREVER);
buf = drv_data->reg_cache.gpio;
buf ^= mask;
ret = write_port_regs(dev, REG_GPIO_PORTA, buf);
if (ret == 0) {
drv_data->reg_cache.gpio = buf;
}
k_sem_give(&drv_data->lock);
return ret;
}
static int mcp23017_pin_interrupt_configure(const struct device *dev, gpio_pin_t pin,
enum gpio_int_mode mode, enum gpio_int_trig trig) {
return -ENOTSUP;
}
static const struct gpio_driver_api api_table = {
.pin_configure = mcp23017_config,
.port_get_raw = mcp23017_port_get_raw,
.port_set_masked_raw = mcp23017_port_set_masked_raw,
.port_set_bits_raw = mcp23017_port_set_bits_raw,
.port_clear_bits_raw = mcp23017_port_clear_bits_raw,
.port_toggle_bits = mcp23017_port_toggle_bits,
.pin_interrupt_configure = mcp23017_pin_interrupt_configure,
};
/**
* @brief Initialization function of MCP23017
*
* @param dev Device struct
* @return 0 if successful, failed otherwise.
*/
static int mcp23017_init(const struct device *dev) {
const struct mcp23017_config *const config = dev->config;
struct mcp23017_drv_data *const drv_data = (struct mcp23017_drv_data *const)dev->data;
drv_data->i2c = device_get_binding((char *)config->i2c_dev_name);
if (!drv_data->i2c) {
LOG_DBG("Unable to get i2c device");
return -ENODEV;
}
k_sem_init(&drv_data->lock, 1, 1);
return 0;
}
#define MCP23017_INIT(inst) \
static struct mcp23017_config mcp23017_##inst##_config = { \
.i2c_dev_name = DT_INST_BUS_LABEL(inst), \
.slave = DT_INST_REG_ADDR(inst), \
\
}; \
\
static struct mcp23017_drv_data mcp23017_##inst##_drvdata = { \
/* Default for registers according to datasheet */ \
.reg_cache.iodir = 0xFFFF, .reg_cache.ipol = 0x0, .reg_cache.gpinten = 0x0, \
.reg_cache.defval = 0x0, .reg_cache.intcon = 0x0, .reg_cache.iocon = 0x0, \
.reg_cache.gppu = 0x0, .reg_cache.intf = 0x0, .reg_cache.intcap = 0x0, \
.reg_cache.gpio = 0x0, .reg_cache.olat = 0x0, \
}; \
\
/* This has to init after SPI master */ \
DEVICE_DT_INST_DEFINE(inst, mcp23017_init, NULL, &mcp23017_##inst##_drvdata, \
&mcp23017_##inst##_config, POST_KERNEL, \
CONFIG_GPIO_MCP23017_INIT_PRIORITY, &api_table);
DT_INST_FOREACH_STATUS_OKAY(MCP23017_INIT)