1 files changed, 78 insertions, 0 deletions
diff --git a/drivers/gpio/pca9555.c b/drivers/gpio/pca9555.c
new file mode 100644
index 0000000000..b0e542d8de
--- /dev/null
+++ b/drivers/gpio/pca9555.c
@@ -0,0 +1,78 @@
+/* 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/>.
+ */
+#include "i2c_master.h"
+#include "pca9555.h"
+
+#include "debug.h"
+
+#define SLAVE_TO_ADDR(n) (n << 1)
+#define TIMEOUT 100
+
+enum {
+  CMD_INPUT_0 = 0,
+  CMD_INPUT_1,
+  CMD_OUTPUT_0,
+  CMD_OUTPUT_1,
+  CMD_INVERSION_0,
+  CMD_INVERSION_1,
+  CMD_CONFIG_0,
+  CMD_CONFIG_1,
+};
+
+void pca9555_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();
+}
+
+void pca9555_set_config(uint8_t slave_addr, uint8_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");
+  }
+}
+
+void pca9555_set_output(uint8_t slave_addr, uint8_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");
+  }
+}
+
+uint8_t pca9555_readPins(uint8_t slave_addr, uint8_t port) {
+  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);
+  if (ret != I2C_STATUS_SUCCESS) {
+    print("pca9555_readPins::FAILED\n");
+  }
+  return data;
+}