1 files changed, 108 insertions, 0 deletions
diff --git a/drivers/gpio/mcp23018.c b/drivers/gpio/mcp23018.c
new file mode 100644
index 0000000000..dc8ab03c50
--- /dev/null
+++ b/drivers/gpio/mcp23018.c
@@ -0,0 +1,108 @@
+// Copyright 2022 zvecr<git@zvecr.com>
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "mcp23018.h"
+#include "i2c_master.h"
+#include "wait.h"
+#include "debug.h"
+
+#define SLAVE_TO_ADDR(n) (n << 1)
+#define TIMEOUT 100
+
+enum {
+    CMD_IODIRA = 0x00,  // i/o direction register
+    CMD_IODIRB = 0x01,
+    CMD_GPPUA  = 0x0C,  // GPIO pull-up resistor register
+    CMD_GPPUB  = 0x0D,
+    CMD_GPIOA  = 0x12,  // general purpose i/o port register (write modifies OLAT)
+    CMD_GPIOB  = 0x13,
+};
+
+void mcp23018_init(uint8_t addr) {
+    static uint8_t s_init = 0;
+    if (!s_init) {
+        i2c_init();
+        wait_ms(1000);
+
+        s_init = 1;
+    }
+}
+
+bool mcp23018_set_config(uint8_t slave_addr, mcp23018_port_t port, uint8_t conf) {
+    uint8_t addr         = SLAVE_TO_ADDR(slave_addr);
+    uint8_t cmdDirection = port ? CMD_IODIRB : CMD_IODIRA;
+    uint8_t cmdPullup    = port ? CMD_GPPUB : CMD_GPPUA;
+
+    i2c_status_t ret = i2c_writeReg(addr, cmdDirection, &conf, sizeof(conf), TIMEOUT);
+    if (ret != I2C_STATUS_SUCCESS) {
+        dprintf("mcp23018_set_config::directionFAILED::%u\n", ret);
+        return false;
+    }
+
+    ret = i2c_writeReg(addr, cmdPullup, &conf, sizeof(conf), TIMEOUT);
+    if (ret != I2C_STATUS_SUCCESS) {
+        dprintf("mcp23018_set_config::pullupFAILED::%u\n", ret);
+        return false;
+    }
+
+    return true;
+}
+
+bool mcp23018_set_output(uint8_t slave_addr, mcp23018_port_t port, uint8_t conf) {
+    uint8_t addr = SLAVE_TO_ADDR(slave_addr);
+    uint8_t cmd  = port ? CMD_GPIOB : CMD_GPIOA;
+
+    i2c_status_t ret = i2c_writeReg(addr, cmd, &conf, sizeof(conf), TIMEOUT);
+    if (ret != I2C_STATUS_SUCCESS) {
+        dprintf("mcp23018_set_output::FAILED::%u\n", ret);
+        return false;
+    }
+
+    return true;
+}
+
+bool mcp23018_set_output_all(uint8_t slave_addr, uint8_t confA, uint8_t confB) {
+    uint8_t addr    = SLAVE_TO_ADDR(slave_addr);
+    uint8_t conf[2] = {confA, confB};
+
+    i2c_status_t ret = i2c_writeReg(addr, CMD_GPIOA, &conf[0], sizeof(conf), TIMEOUT);
+    if (ret != I2C_STATUS_SUCCESS) {
+        dprintf("mcp23018_set_output::FAILED::%u\n", ret);
+        return false;
+    }
+
+    return true;
+}
+
+bool mcp23018_readPins(uint8_t slave_addr, mcp23018_port_t port, uint8_t* out) {
+    uint8_t addr = SLAVE_TO_ADDR(slave_addr);
+    uint8_t cmd  = port ? CMD_GPIOB : CMD_GPIOA;
+
+    i2c_status_t ret = i2c_readReg(addr, cmd, out, sizeof(uint8_t), TIMEOUT);
+    if (ret != I2C_STATUS_SUCCESS) {
+        dprintf("mcp23018_readPins::FAILED::%u\n", ret);
+        return false;
+    }
+
+    return true;
+}
+
+bool mcp23018_readPins_all(uint8_t slave_addr, uint16_t* out) {
+    uint8_t addr = SLAVE_TO_ADDR(slave_addr);
+
+    typedef union {
+        uint8_t  u8[2];
+        uint16_t u16;
+    } data16;
+
+    data16 data = {.u16 = 0};
+
+    i2c_status_t ret = i2c_readReg(addr, CMD_GPIOA, &data.u8[0], sizeof(data), TIMEOUT);
+    if (ret != I2C_STATUS_SUCCESS) {
+        dprintf("mcp23018_readPins::FAILED::%u\n", ret);
+        return false;
+    }
+
+    *out = data.u16;
+    return true;
+}