| /* |
| * |
| * Copyright (c) 2021 metraTec GmbH |
| * Copyright (c) 2021 Peter Johanson |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| /** |
| * @file Driver for MPC230xx I2C-based GPIO driver. |
| */ |
| |
| #include <errno.h> |
| #include <zephyr/kernel.h> |
| #include <zephyr/device.h> |
| #include <zephyr/sys/byteorder.h> |
| #include <zephyr/drivers/gpio.h> |
| #include <zephyr/drivers/i2c.h> |
| |
| #include <zephyr/drivers/gpio/gpio_utils.h> |
| #include "gpio_mcp23xxx.h" |
| |
| #define LOG_LEVEL CONFIG_GPIO_LOG_LEVEL |
| #include <zephyr/logging/log.h> |
| LOG_MODULE_REGISTER(gpio_mcp230xx); |
| |
| static int mcp230xx_read_port_regs(const struct device *dev, uint8_t reg, uint16_t *buf) |
| { |
| const struct mcp23xxx_config *config = dev->config; |
| uint16_t port_data = 0; |
| int ret; |
| |
| uint8_t nread = (config->ngpios == 8) ? 1 : 2; |
| |
| ret = i2c_burst_read_dt(&config->bus.i2c, reg, (uint8_t *)&port_data, nread); |
| if (ret < 0) { |
| LOG_ERR("i2c_read failed!"); |
| return ret; |
| } |
| |
| *buf = sys_le16_to_cpu(port_data); |
| |
| return 0; |
| } |
| |
| static int mcp230xx_write_port_regs(const struct device *dev, uint8_t reg, uint16_t value) |
| { |
| const struct mcp23xxx_config *config = dev->config; |
| int ret; |
| |
| uint8_t nwrite = (config->ngpios == 8) ? 2 : 3; |
| uint8_t buf[3]; |
| |
| buf[0] = reg; |
| sys_put_le16(value, &buf[1]); |
| |
| ret = i2c_write_dt(&config->bus.i2c, buf, nwrite); |
| if (ret < 0) { |
| LOG_ERR("i2c_write failed!"); |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| static int mcp230xx_bus_is_ready(const struct device *dev) |
| { |
| const struct mcp23xxx_config *config = dev->config; |
| |
| if (!device_is_ready(config->bus.i2c.bus)) { |
| LOG_ERR("I2C bus %s not ready", config->bus.i2c.bus->name); |
| return -ENODEV; |
| } |
| |
| return 0; |
| } |
| |
| #define GPIO_MCP230XX_DEVICE(inst, num_gpios, open_drain) \ |
| static struct mcp23xxx_drv_data mcp230xx_##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, \ |
| }; \ |
| static const struct mcp23xxx_config mcp230xx_##inst##_config = { \ |
| .config = { \ |
| .port_pin_mask = GPIO_PORT_PIN_MASK_FROM_DT_INST(inst), \ |
| }, \ |
| .bus = { \ |
| .i2c = I2C_DT_SPEC_INST_GET(inst), \ |
| }, \ |
| .gpio_int = GPIO_DT_SPEC_INST_GET_OR(inst, int_gpios, {0}), \ |
| .gpio_reset = GPIO_DT_SPEC_INST_GET_OR(inst, reset_gpios, {0}), \ |
| .ngpios = num_gpios, \ |
| .is_open_drain = open_drain, \ |
| .read_fn = mcp230xx_read_port_regs, \ |
| .write_fn = mcp230xx_write_port_regs, \ |
| .bus_fn = mcp230xx_bus_is_ready, \ |
| }; \ |
| DEVICE_DT_INST_DEFINE(inst, gpio_mcp23xxx_init, NULL, &mcp230xx_##inst##_drvdata, \ |
| &mcp230xx_##inst##_config, POST_KERNEL, \ |
| CONFIG_GPIO_MCP230XX_INIT_PRIORITY, &gpio_mcp23xxx_api_table); |
| |
| #define DT_DRV_COMPAT microchip_mcp23008 |
| DT_INST_FOREACH_STATUS_OKAY_VARGS(GPIO_MCP230XX_DEVICE, 8, false) |
| #undef DT_DRV_COMPAT |
| #define DT_DRV_COMPAT microchip_mcp23009 |
| DT_INST_FOREACH_STATUS_OKAY_VARGS(GPIO_MCP230XX_DEVICE, 8, true) |
| #undef DT_DRV_COMPAT |
| #define DT_DRV_COMPAT microchip_mcp23016 |
| DT_INST_FOREACH_STATUS_OKAY_VARGS(GPIO_MCP230XX_DEVICE, 16, false) |
| #undef DT_DRV_COMPAT |
| #define DT_DRV_COMPAT microchip_mcp23017 |
| DT_INST_FOREACH_STATUS_OKAY_VARGS(GPIO_MCP230XX_DEVICE, 16, false) |
| #undef DT_DRV_COMPAT |
| #define DT_DRV_COMPAT microchip_mcp23018 |
| DT_INST_FOREACH_STATUS_OKAY_VARGS(GPIO_MCP230XX_DEVICE, 16, true) |
| #undef DT_DRV_COMPAT |
