[Keyboard] added matrix 8xv2.0 additional (#9470)

* added matrix 8xv2.0 additional keyboard

* Apply suggestions from code review

Co-authored-by: James Young <18669334+noroadsleft@users.noreply.github.com>

* add copyright and speed up the matrix scanning

* Update keyboards/matrix/m20add/rules.mk

Co-authored-by: Drashna Jaelre <drashna@live.com>

Co-authored-by: James Young <18669334+noroadsleft@users.noreply.github.com>
Co-authored-by: Drashna Jaelre <drashna@live.com>

1 files changed, 115 insertions, 0 deletions

diff --git a/keyboards/matrix/m20add/tca6424.c b/keyboards/matrix/m20add/tca6424.c
new file mode 100644
index 000000000..38cea9f15
--- /dev/null
+++ b/keyboards/matrix/m20add/tca6424.c
@@ -0,0 +1,115 @@
+/**
+ * @file tca6424.c
+ * @author astro
+ * @brief  driver for the tca6424
+ *
+ * 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 "tca6424.h"
+#include "i2c_master.h"
+
+#define TCA6424_INPUT_PORT0     0x0
+#define TCA6424_INPUT_PORT1     0x01
+#define TCA6424_INPUT_PORT2     0x02
+
+#define TCA6424_OUTPUT_PORT0    0x04
+#define TCA6424_OUTPUT_PORT1    0x05
+#define TCA6424_OUTPUT_PORT2    0x06
+
+#define TCA6424_POLARITY_PORT0  0x08
+#define TCA6424_POLARITY_PORT1  0x09
+#define TCA6424_POLARITY_PORT2  0x0A
+
+#define TCA6424_CONF_PORT0      0x0C
+#define TCA6424_CONF_PORT1      0x0D
+#define TCA6424_CONF_PORT2      0x0E
+
+#define TIMEOUT         100
+
+void tca6424_init(void)
+{
+    i2c_init();
+}
+
+static void write_port(uint8_t p, uint8_t d)
+{
+    i2c_writeReg(TCA6424_ADDR, p, &d, 1, TIMEOUT);
+}
+
+static uint8_t read_port(uint8_t port)
+{
+    uint8_t data = 0;
+    i2c_readReg(TCA6424_ADDR, port, &data, 1, TIMEOUT);
+    return data;
+}
+
+void tca6424_write_config(TCA6424_PORT port, uint8_t data)
+{
+    switch(port) {
+        case TCA6424_PORT0:
+            write_port(TCA6424_CONF_PORT0, data);
+            break;
+        case TCA6424_PORT1:
+            write_port(TCA6424_CONF_PORT1, data);
+            break;
+        case TCA6424_PORT2:
+            write_port(TCA6424_CONF_PORT2, data);
+            break;
+    }
+}
+
+void tca6424_write_polarity(TCA6424_PORT port, uint8_t data)
+{
+    switch(port) {
+        case TCA6424_PORT0:
+            write_port(TCA6424_POLARITY_PORT0, data);
+            break;
+        case TCA6424_PORT1:
+            write_port(TCA6424_POLARITY_PORT1, data);
+            break;
+        case TCA6424_PORT2:
+            write_port(TCA6424_POLARITY_PORT2, data);
+            break;
+    }
+}
+
+void tca6424_write_port(TCA6424_PORT port, uint8_t data)
+{
+    switch(port) {
+        case TCA6424_PORT0:
+            write_port(TCA6424_OUTPUT_PORT0, data);
+            break;
+        case TCA6424_PORT1:
+            write_port(TCA6424_OUTPUT_PORT1, data);
+            break;
+        case TCA6424_PORT2:
+            write_port(TCA6424_OUTPUT_PORT2, data);
+            break;
+    }
+}
+
+uint8_t tca6424_read_port(TCA6424_PORT port)
+{
+    switch(port) {
+        case TCA6424_PORT0:
+            return read_port(TCA6424_INPUT_PORT0);
+        case TCA6424_PORT1:
+            return read_port(TCA6424_INPUT_PORT1);
+        case TCA6424_PORT2:
+            return read_port(TCA6424_INPUT_PORT2);
+    }
+
+    return 0;
+}