Align existing pca9555 driver to better match mcp23018 API (#16277)

2 files changed, 92 insertions, 50 deletions

diff --git a/drivers/gpio/pca9555.c b/drivers/gpio/pca9555.c
index 02b5abbdde..adcd040083 100644
--- a/drivers/gpio/pca9555.c
+++ b/drivers/gpio/pca9555.c
@@ -1,18 +1,6 @@
-/* Copyright 2019
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2020 zvecr<git@zvecr.com>
+// SPDX-License-Identifier: GPL-2.0-or-later
+
 #include "i2c_master.h"
 #include "pca9555.h"
 
@@ -45,39 +33,59 @@ void pca9555_init(uint8_t slave_addr) {
     // i2c_stop();
 }
 
-void pca9555_set_config(uint8_t slave_addr, uint8_t port, uint8_t conf) {
+bool pca9555_set_config(uint8_t slave_addr, pca9555_port_t port, uint8_t conf) {
     uint8_t addr = SLAVE_TO_ADDR(slave_addr);
     uint8_t cmd  = port ? CMD_CONFIG_1 : CMD_CONFIG_0;
 
     i2c_status_t ret = i2c_writeReg(addr, cmd, &conf, sizeof(conf), TIMEOUT);
     if (ret != I2C_STATUS_SUCCESS) {
         print("pca9555_set_config::FAILED\n");
+        return false;
     }
+
+    return true;
 }
 
-void pca9555_set_output(uint8_t slave_addr, uint8_t port, uint8_t conf) {
+bool pca9555_set_output(uint8_t slave_addr, pca9555_port_t port, uint8_t conf) {
     uint8_t addr = SLAVE_TO_ADDR(slave_addr);
     uint8_t cmd  = port ? CMD_OUTPUT_1 : CMD_OUTPUT_0;
 
     i2c_status_t ret = i2c_writeReg(addr, cmd, &conf, sizeof(conf), TIMEOUT);
     if (ret != I2C_STATUS_SUCCESS) {
         print("pca9555_set_output::FAILED\n");
+        return false;
     }
+
+    return true;
 }
 
-uint8_t pca9555_readPins(uint8_t slave_addr, uint8_t port) {
+bool pca9555_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_OUTPUT_0, &conf[0], sizeof(conf), TIMEOUT);
+    if (ret != I2C_STATUS_SUCCESS) {
+        dprintf("pca9555_set_output::FAILED::%u\n", ret);
+        return false;
+    }
+
+    return true;
+}
+
+bool pca9555_readPins(uint8_t slave_addr, pca9555_port_t port, uint8_t* out) {
     uint8_t addr = SLAVE_TO_ADDR(slave_addr);
     uint8_t cmd  = port ? CMD_INPUT_1 : CMD_INPUT_0;
 
-    uint8_t      data = 0;
-    i2c_status_t ret  = i2c_readReg(addr, cmd, &data, sizeof(data), TIMEOUT);
+    i2c_status_t ret = i2c_readReg(addr, cmd, out, sizeof(uint8_t), TIMEOUT);
     if (ret != I2C_STATUS_SUCCESS) {
         print("pca9555_readPins::FAILED\n");
+        return false;
     }
-    return data;
+
+    return true;
 }
 
-uint16_t pca9555_readAllPins(uint8_t slave_addr) {
+bool pca9555_readPins_all(uint8_t slave_addr, uint16_t* out) {
     uint8_t addr = SLAVE_TO_ADDR(slave_addr);
 
     typedef union {
@@ -85,11 +93,14 @@ uint16_t pca9555_readAllPins(uint8_t slave_addr) {
         uint16_t u16;
     } data16;
 
-    data16 data;
+    data16 data = {.u16 = 0};
 
     i2c_status_t ret = i2c_readReg(addr, CMD_INPUT_0, &data.u8[0], sizeof(data), TIMEOUT);
     if (ret != I2C_STATUS_SUCCESS) {
-        print("pca9555_readAllPins::FAILED\n");
+        print("pca9555_readPins_all::FAILED\n");
+        return false;
     }
-    return data.u16;
+
+    *out = data.u16;
+    return true;
 }
diff --git a/drivers/gpio/pca9555.h b/drivers/gpio/pca9555.h
index 3341ec3eb5..6362ab68ae 100644
--- a/drivers/gpio/pca9555.h
+++ b/drivers/gpio/pca9555.h
@@ -1,20 +1,11 @@
-/* Copyright 2019
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2020 zvecr<git@zvecr.com>
+// SPDX-License-Identifier: GPL-2.0-or-later
+
 #pragma once
 
+#include <stdint.h>
+#include <stdbool.h>
+
 /*
             PCA9555
          ,----------.
@@ -38,20 +29,60 @@
          `----------'
 */
 
-#define PCA9555_PORT0 0
-#define PCA9555_PORT1 1
+/**
+ * Port ID
+ */
+typedef enum {
+    PCA9555_PORT0,
+    PCA9555_PORT1,
+} pca9555_port_t;
 
-#define ALL_OUTPUT 0
-#define ALL_INPUT 0xFF
-#define ALL_LOW 0
-#define ALL_HIGH 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 pca9555_init(uint8_t slave_addr);
 
-void pca9555_set_config(uint8_t slave_addr, uint8_t port, uint8_t conf);
+/**
+ * Configure input/output to a given port
+ */
+bool pca9555_set_config(uint8_t slave_addr, pca9555_port_t port, uint8_t conf);
 
-void pca9555_set_output(uint8_t slave_addr, uint8_t port, uint8_t conf);
+/**
+ * Write high/low to a given port
+ */
+bool pca9555_set_output(uint8_t slave_addr, pca9555_port_t port, uint8_t conf);
 
-uint8_t pca9555_readPins(uint8_t slave_addr, uint8_t port);
+/**
+ * Write high/low to both ports sequentially
+ *
+ *  - slightly faster than multiple set_output
+ */
+bool pca9555_set_output_all(uint8_t slave_addr, uint8_t confA, uint8_t confB);
 
-uint16_t pca9555_readAllPins(uint8_t slave_addr);
+/**
+ * Read state of a given port
+ */
+bool pca9555_readPins(uint8_t slave_addr, pca9555_port_t port, uint8_t* ret);
+
+/**
+ * Read state of both ports sequentially
+ *
+ *  - slightly faster than multiple readPins
+ */
+bool pca9555_readPins_all(uint8_t slave_addr, uint16_t* ret);