* Upstream Zephyr has in progress driver, so doing this locally here, until we can move over to that driver.
333 lines
10 KiB
C
333 lines
10 KiB
C
/*
|
|
* 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, device_pm_control_nop, &mcp23017_##inst##_drvdata, \
|
|
&mcp23017_##inst##_config, POST_KERNEL, \
|
|
CONFIG_GPIO_MCP23017_INIT_PRIORITY, &api_table);
|
|
|
|
DT_INST_FOREACH_STATUS_OKAY(MCP23017_INIT)
|