From febb93788cf5766e927c931710c6bc8dc21ae3d2 Mon Sep 17 00:00:00 2001
From: Theo Arends <11044339+arendst@users.noreply.github.com>
Date: Thu, 26 Sep 2019 12:30:21 +0200
Subject: [PATCH] Experimental support for SM2135

Experimental support for SM2135 (#6495)
---
 sonoff/xdrv_26_sm2135.ino | 104 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 104 insertions(+)
 create mode 100644 sonoff/xdrv_26_sm2135.ino

diff --git a/sonoff/xdrv_26_sm2135.ino b/sonoff/xdrv_26_sm2135.ino
new file mode 100644
index 000000000..0590cda1c
--- /dev/null
+++ b/sonoff/xdrv_26_sm2135.ino
@@ -0,0 +1,104 @@
+/*
+  xdrv_26_sm2135.ino - sm2135 I2C five channel led support for Sonoff-Tasmota
+
+  Copyright (C) 2019  Theo Arends
+
+  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 3 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/>.
+*/
+
+#ifdef USE_LIGHT
+#ifdef USE_SM2135
+/*********************************************************************************************\
+ * SM2135 I2C RGBCW Led bulbs like Action LSC SmartLed
+\*********************************************************************************************/
+
+#define XDRV_26             26
+
+#define SM2135_ADDR         0x40  // 0x40 .. 0x46
+#define SM2135_CURRENT      0x24  // Defaults: 20mA for RGB, 30mA for CW
+#define SM2135_RGB          0x00
+#define SM2135_CW           0x80
+
+struct SM2135 {
+  bool found = true;
+} Sm2135;
+
+bool Sm2135SetChannels(void)
+{
+  char *buffer = XdrvMailbox.data;
+
+  // EXPERIMENTAL: Figure out if selecting RGB or CW blanks the opposite
+
+  if (('\0' == buffer[3]) && ('\0' == buffer[4])) {
+    Wire.beginTransmission(SM2135_ADDR);
+    Wire.write(SM2135_CURRENT);           // Set current
+    Wire.write(SM2135_RGB);               // Select RGB - Shutdown CW?
+    Wire.write(buffer[0]);                // Red
+    Wire.write(buffer[1]);                // Green
+    Wire.write(buffer[2]);                // Blue
+    Wire.endTransmission();
+  } else {
+    Wire.beginTransmission(SM2135_ADDR);
+    Wire.write(SM2135_CURRENT);           // Set current
+    Wire.write(SM2135_CW);                // Select CW - Shutdown RGB?
+    Wire.endTransmission();
+
+    Wire.beginTransmission(SM2135_ADDR +5);
+    Wire.write(buffer[4]);                // Cold
+    Wire.write(buffer[3]);                // Warm
+    Wire.endTransmission();
+  }
+
+  return true;
+}
+
+bool Sm2135ModuleSelected(void)
+{
+  if (I2cDevice(SM2135_ADDR)) {
+
+    // Make sure it is the SM2135 chip as it's address is also used by HTU21, INA219, INA226
+    // EXPERIMENTAL: Need further testing
+
+    light_type = LT_RGBWC;
+
+    AddLog_P2(LOG_LEVEL_DEBUG, S_LOG_I2C_FOUND_AT, "SM2135", SM2135_ADDR);
+  } else {
+    Sm2135.found = false;
+  }
+  return Sm2135.found;
+}
+
+/*********************************************************************************************\
+ * Interface
+\*********************************************************************************************/
+
+bool Xdrv26(uint8_t function)
+{
+  bool result = false;
+
+  if (i2c_flg && Sm2135.found) {
+    switch (function) {
+      case FUNC_SET_CHANNELS:
+        result = Sm2135SetChannels();
+        break;
+      case FUNC_MODULE_INIT:
+        result = Sm2135ModuleSelected();
+        break;
+    }
+  }
+  return result;
+}
+
+#endif  // USE_SM2135
+#endif  // USE_LIGHT