2 files changed, 233 insertions(+), 0 deletions(-)

A drivers/gpio/pca9505.c
A drivers/gpio/pca9505.h

@@ 0,0 1,166 @@
+// Copyright 2022 nirim000
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "i2c_master.h"
+#include "pca9505.h"
+
+#include "debug.h"
+
+#define SLAVE_TO_ADDR(n) (n << 1)
+#define TIMEOUT 100
+
+enum {
+    CMD_INPUT_0 = 0,
+    CMD_INPUT_1,
+    CMD_INPUT_2,
+    CMD_INPUT_3,
+    CMD_INPUT_4,
+    CMD_OUTPUT_0 = 8,
+    CMD_OUTPUT_1,
+    CMD_OUTPUT_2,
+    CMD_OUTPUT_3,
+    CMD_OUTPUT_4,
+    CMD_INVERSION_0 = 16,
+    CMD_INVERSION_1,
+    CMD_INVERSION_2,
+    CMD_INVERSION_3,
+    CMD_INVERSION_4,
+    CMD_CONFIG_0 = 24,
+    CMD_CONFIG_1,
+    CMD_CONFIG_2,
+    CMD_CONFIG_3,
+    CMD_CONFIG_4,
+};
+
+void pca9505_init(uint8_t slave_addr) {
+    static uint8_t s_init = 0;
+    if (!s_init) {
+        i2c_init();
+
+        s_init = 1;
+    }
+
+    // TODO: could check device connected
+    // i2c_start(SLAVE_TO_ADDR(slave) | I2C_WRITE);
+    // i2c_stop();
+}
+
+bool pca9505_set_config(uint8_t slave_addr, pca9505_port_t port, uint8_t conf) {
+    uint8_t addr = SLAVE_TO_ADDR(slave_addr);
+    uint8_t cmd  = 0;
+    switch (port) {
+        case 0:
+            cmd = CMD_CONFIG_0;
+            break;
+        case 1:
+            cmd = CMD_CONFIG_1;
+            break;
+        case 2:
+            cmd = CMD_CONFIG_2;
+            break;
+        case 3:
+            cmd = CMD_CONFIG_3;
+            break;
+        case 4:
+            cmd = CMD_CONFIG_4;
+            break;
+    }
+
+    i2c_status_t ret = i2c_writeReg(addr, cmd, &conf, sizeof(conf), TIMEOUT);
+    if (ret != I2C_STATUS_SUCCESS) {
+        print("pca9505_set_config::FAILED\n");
+        return false;
+    }
+
+    return true;
+}
+
+bool pca9505_set_polarity(uint8_t slave_addr, pca9505_port_t port, uint8_t conf) {
+    uint8_t addr = SLAVE_TO_ADDR(slave_addr);
+    uint8_t cmd  = 0;
+    switch (port) {
+        case 0:
+            cmd = CMD_INVERSION_0;
+            break;
+        case 1:
+            cmd = CMD_INVERSION_1;
+            break;
+        case 2:
+            cmd = CMD_INVERSION_2;
+            break;
+        case 3:
+            cmd = CMD_INVERSION_3;
+            break;
+        case 4:
+            cmd = CMD_INVERSION_4;
+            break;
+    }
+
+    i2c_status_t ret = i2c_writeReg(addr, cmd, &conf, sizeof(conf), TIMEOUT);
+    if (ret != I2C_STATUS_SUCCESS) {
+        print("pca9505_set_polarity::FAILED\n");
+        return false;
+    }
+
+    return true;
+}
+
+bool pca9505_set_output(uint8_t slave_addr, pca9505_port_t port, uint8_t conf) {
+    uint8_t addr = SLAVE_TO_ADDR(slave_addr);
+    uint8_t cmd  = 0;
+    switch (port) {
+        case 0:
+            cmd = CMD_OUTPUT_0;
+            break;
+        case 1:
+            cmd = CMD_OUTPUT_1;
+            break;
+        case 2:
+            cmd = CMD_OUTPUT_2;
+            break;
+        case 3:
+            cmd = CMD_OUTPUT_3;
+            break;
+        case 4:
+            cmd = CMD_OUTPUT_4;
+            break;
+    }
+
+    i2c_status_t ret = i2c_writeReg(addr, cmd, &conf, sizeof(conf), TIMEOUT);
+    if (ret != I2C_STATUS_SUCCESS) {
+        print("pca9505_set_output::FAILED\n");
+        return false;
+    }
+
+    return true;
+}
+
+bool pca9505_readPins(uint8_t slave_addr, pca9505_port_t port, uint8_t* out) {
+    uint8_t addr = SLAVE_TO_ADDR(slave_addr);
+    uint8_t cmd  = 0;
+    switch (port) {
+        case 0:
+            cmd = CMD_INPUT_0;
+            break;
+        case 1:
+            cmd = CMD_INPUT_1;
+            break;
+        case 2:
+            cmd = CMD_INPUT_2;
+            break;
+        case 3:
+            cmd = CMD_INPUT_3;
+            break;
+        case 4:
+            cmd = CMD_INPUT_4;
+            break;
+    }
+
+    i2c_status_t ret = i2c_readReg(addr, cmd, out, sizeof(uint8_t), TIMEOUT);
+    if (ret != I2C_STATUS_SUCCESS) {
+        print("pca9505_readPins::FAILED\n");
+        return false;
+    }
+
+    return true;
+}

@@ 0,0 1,67 @@
+// Copyright 2022 nirim000
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <stdint.h>
+#include <stdbool.h>
+
+/**
+ * Port ID
+ */
+typedef enum {
+    PCA9505_PORT0,
+    PCA9505_PORT1,
+    PCA9505_PORT2,
+    PCA9505_PORT3,
+    PCA9505_PORT4,
+} pca9505_port_t;
+
+/**
+ * Helpers for set_config
+ */
+enum {
+    ALL_NORMAL   = 0,
+    ALL_INVERTED = 0xFF,
+};
+
+/**
+ * Helpers for set_config
+ */
+enum {
+    ALL_OUTPUT = 0,
+    ALL_INPUT  = 0xFF,
+};
+
+/**
+ * Helpers for set_output
+ */
+enum {
+    ALL_LOW  = 0,
+    ALL_HIGH = 0xFF,
+};
+
+/**
+ * Init expander and any other dependent drivers
+ */
+void pca9505_init(uint8_t slave_addr);
+
+/**
+ * Configure input/output to a given port
+ */
+bool pca9505_set_config(uint8_t slave_addr, pca9505_port_t port, uint8_t conf);
+
+/**
+ * Configure polarity to a given port
+ */
+bool pca9505_set_polarity(uint8_t slave_addr, pca9505_port_t port, uint8_t conf);
+
+/**
+ * Write high/low to a given port
+ */
+bool pca9505_set_output(uint8_t slave_addr, pca9505_port_t port, uint8_t conf);
+
+/**
+ * Read state of a given port
+ */
+bool pca9505_readPins(uint8_t slave_addr, pca9505_port_t port, uint8_t* ret);