1 files changed, 269 insertions, 0 deletions

diff --git a/drivers/led/issi/is31fl3736.c b/drivers/led/issi/is31fl3736.c
new file mode 100644
index 000000000..7dece1b1e
--- /dev/null
+++ b/drivers/led/issi/is31fl3736.c
@@ -0,0 +1,269 @@
+/* Copyright 2018 Jason Williams (Wilba)
+ *
+ * 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 "is31fl3736.h"
+#include "i2c_master.h"
+#include "wait.h"
+
+// This is a 7-bit address, that gets left-shifted and bit 0
+// set to 0 for write, 1 for read (as per I2C protocol)
+// The address will vary depending on your wiring:
+// 00 <-> GND
+// 01 <-> SCL
+// 10 <-> SDA
+// 11 <-> VCC
+// ADDR1 represents A1:A0 of the 7-bit address.
+// ADDR2 represents A3:A2 of the 7-bit address.
+// The result is: 0b101(ADDR2)(ADDR1)
+#define ISSI_ADDR_DEFAULT 0x50
+
+#define ISSI_COMMANDREGISTER 0xFD
+#define ISSI_COMMANDREGISTER_WRITELOCK 0xFE
+#define ISSI_INTERRUPTMASKREGISTER 0xF0
+#define ISSI_INTERRUPTSTATUSREGISTER 0xF1
+
+#define ISSI_PAGE_LEDCONTROL 0x00  // PG0
+#define ISSI_PAGE_PWM 0x01         // PG1
+#define ISSI_PAGE_AUTOBREATH 0x02  // PG2
+#define ISSI_PAGE_FUNCTION 0x03    // PG3
+
+#define ISSI_REG_CONFIGURATION 0x00  // PG3
+#define ISSI_REG_GLOBALCURRENT 0x01  // PG3
+#define ISSI_REG_RESET 0x11          // PG3
+#define ISSI_REG_SWPULLUP 0x0F       // PG3
+#define ISSI_REG_CSPULLUP 0x10       // PG3
+
+#ifndef ISSI_TIMEOUT
+#    define ISSI_TIMEOUT 100
+#endif
+
+#ifndef ISSI_PERSISTENCE
+#    define ISSI_PERSISTENCE 0
+#endif
+
+// Transfer buffer for TWITransmitData()
+uint8_t g_twi_transfer_buffer[20];
+
+// These buffers match the IS31FL3736 PWM registers.
+// The control buffers match the PG0 LED On/Off registers.
+// Storing them like this is optimal for I2C transfers to the registers.
+// We could optimize this and take out the unused registers from these
+// buffers and the transfers in IS31FL3736_write_pwm_buffer() but it's
+// probably not worth the extra complexity.
+uint8_t g_pwm_buffer[DRIVER_COUNT][192];
+bool    g_pwm_buffer_update_required = false;
+
+uint8_t g_led_control_registers[DRIVER_COUNT][24] = {{0}, {0}};
+bool    g_led_control_registers_update_required   = false;
+
+void IS31FL3736_write_register(uint8_t addr, uint8_t reg, uint8_t data) {
+    g_twi_transfer_buffer[0] = reg;
+    g_twi_transfer_buffer[1] = data;
+
+#if ISSI_PERSISTENCE > 0
+    for (uint8_t i = 0; i < ISSI_PERSISTENCE; i++) {
+        if (i2c_transmit(addr << 1, g_twi_transfer_buffer, 2, ISSI_TIMEOUT) == 0) break;
+    }
+#else
+    i2c_transmit(addr << 1, g_twi_transfer_buffer, 2, ISSI_TIMEOUT);
+#endif
+}
+
+void IS31FL3736_write_pwm_buffer(uint8_t addr, uint8_t *pwm_buffer) {
+    // assumes PG1 is already selected
+
+    // transmit PWM registers in 12 transfers of 16 bytes
+    // g_twi_transfer_buffer[] is 20 bytes
+
+    // iterate over the pwm_buffer contents at 16 byte intervals
+    for (int i = 0; i < 192; i += 16) {
+        g_twi_transfer_buffer[0] = i;
+        // copy the data from i to i+15
+        // device will auto-increment register for data after the first byte
+        // thus this sets registers 0x00-0x0F, 0x10-0x1F, etc. in one transfer
+        for (int j = 0; j < 16; j++) {
+            g_twi_transfer_buffer[1 + j] = pwm_buffer[i + j];
+        }
+
+#if ISSI_PERSISTENCE > 0
+        for (uint8_t i = 0; i < ISSI_PERSISTENCE; i++) {
+            if (i2c_transmit(addr << 1, g_twi_transfer_buffer, 17, ISSI_TIMEOUT) == 0) break;
+        }
+#else
+        i2c_transmit(addr << 1, g_twi_transfer_buffer, 17, ISSI_TIMEOUT);
+#endif
+    }
+}
+
+void IS31FL3736_init(uint8_t addr) {
+    // In order to avoid the LEDs being driven with garbage data
+    // in the LED driver's PWM registers, shutdown is enabled last.
+    // Set up the mode and other settings, clear the PWM registers,
+    // then disable software shutdown.
+
+    // Unlock the command register.
+    IS31FL3736_write_register(addr, ISSI_COMMANDREGISTER_WRITELOCK, 0xC5);
+
+    // Select PG0
+    IS31FL3736_write_register(addr, ISSI_COMMANDREGISTER, ISSI_PAGE_LEDCONTROL);
+    // Turn off all LEDs.
+    for (int i = 0x00; i <= 0x17; i++) {
+        IS31FL3736_write_register(addr, i, 0x00);
+    }
+
+    // Unlock the command register.
+    IS31FL3736_write_register(addr, ISSI_COMMANDREGISTER_WRITELOCK, 0xC5);
+
+    // Select PG1
+    IS31FL3736_write_register(addr, ISSI_COMMANDREGISTER, ISSI_PAGE_PWM);
+    // Set PWM on all LEDs to 0
+    // No need to setup Breath registers to PWM as that is the default.
+    for (int i = 0x00; i <= 0xBF; i++) {
+        IS31FL3736_write_register(addr, i, 0x00);
+    }
+
+    // Unlock the command register.
+    IS31FL3736_write_register(addr, ISSI_COMMANDREGISTER_WRITELOCK, 0xC5);
+
+    // Select PG3
+    IS31FL3736_write_register(addr, ISSI_COMMANDREGISTER, ISSI_PAGE_FUNCTION);
+    // Set global current to maximum.
+    IS31FL3736_write_register(addr, ISSI_REG_GLOBALCURRENT, 0xFF);
+    // Disable software shutdown.
+    IS31FL3736_write_register(addr, ISSI_REG_CONFIGURATION, 0x01);
+
+    // Wait 10ms to ensure the device has woken up.
+    wait_ms(10);
+}
+
+void IS31FL3736_set_color(int index, uint8_t red, uint8_t green, uint8_t blue) {
+    if (index >= 0 && index < DRIVER_LED_TOTAL) {
+        is31_led led = g_is31_leds[index];
+
+        g_pwm_buffer[led.driver][led.r] = red;
+        g_pwm_buffer[led.driver][led.g] = green;
+        g_pwm_buffer[led.driver][led.b] = blue;
+        g_pwm_buffer_update_required    = true;
+    }
+}
+
+void IS31FL3736_set_color_all(uint8_t red, uint8_t green, uint8_t blue) {
+    for (int i = 0; i < DRIVER_LED_TOTAL; i++) {
+        IS31FL3736_set_color(i, red, green, blue);
+    }
+}
+
+void IS31FL3736_set_led_control_register(uint8_t index, bool red, bool green, bool blue) {
+    is31_led led = g_is31_leds[index];
+
+    // IS31FL3733
+    // The PWM register for a matrix position (0x00 to 0xBF) can be
+    // divided by 8 to get the LED control register (0x00 to 0x17),
+    // then mod 8 to get the bit position within that register.
+
+    // IS31FL3736
+    // The PWM register for a matrix position (0x00 to 0xBF) is interleaved, so:
+    // A1=0x00 A2=0x02 A3=0x04 A4=0x06 A5=0x08 A6=0x0A A7=0x0C A8=0x0E
+    // B1=0x10 B2=0x12 B3=0x14
+    // But also, the LED control registers (0x00 to 0x17) are also interleaved, so:
+    // A1-A4=0x00 A5-A8=0x01
+    // So, the same math applies.
+
+    uint8_t control_register_r = led.r / 8;
+    uint8_t control_register_g = led.g / 8;
+    uint8_t control_register_b = led.b / 8;
+
+    uint8_t bit_r = led.r % 8;
+    uint8_t bit_g = led.g % 8;
+    uint8_t bit_b = led.b % 8;
+
+    if (red) {
+        g_led_control_registers[led.driver][control_register_r] |= (1 << bit_r);
+    } else {
+        g_led_control_registers[led.driver][control_register_r] &= ~(1 << bit_r);
+    }
+    if (green) {
+        g_led_control_registers[led.driver][control_register_g] |= (1 << bit_g);
+    } else {
+        g_led_control_registers[led.driver][control_register_g] &= ~(1 << bit_g);
+    }
+    if (blue) {
+        g_led_control_registers[led.driver][control_register_b] |= (1 << bit_b);
+    } else {
+        g_led_control_registers[led.driver][control_register_b] &= ~(1 << bit_b);
+    }
+
+    g_led_control_registers_update_required = true;
+}
+
+void IS31FL3736_mono_set_brightness(int index, uint8_t value) {
+    if (index >= 0 && index < 96) {
+        // Index in range 0..95 -> A1..A8, B1..B8, etc.
+        // Map index 0..95 to registers 0x00..0xBE (interleaved)
+        uint8_t pwm_register          = index * 2;
+        g_pwm_buffer[0][pwm_register] = value;
+        g_pwm_buffer_update_required  = true;
+    }
+}
+
+void IS31FL3736_mono_set_brightness_all(uint8_t value) {
+    for (int i = 0; i < 96; i++) {
+        IS31FL3736_mono_set_brightness(i, value);
+    }
+}
+
+void IS31FL3736_mono_set_led_control_register(uint8_t index, bool enabled) {
+    // Index in range 0..95 -> A1..A8, B1..B8, etc.
+
+    // Map index 0..95 to registers 0x00..0xBE (interleaved)
+    uint8_t pwm_register = index * 2;
+    // Map register 0x00..0xBE (interleaved) into control register and bit
+    uint8_t control_register = pwm_register / 8;
+    uint8_t bit              = pwm_register % 8;
+
+    if (enabled) {
+        g_led_control_registers[0][control_register] |= (1 << bit);
+    } else {
+        g_led_control_registers[0][control_register] &= ~(1 << bit);
+    }
+
+    g_led_control_registers_update_required = true;
+}
+
+void IS31FL3736_update_pwm_buffers(uint8_t addr1, uint8_t addr2) {
+    if (g_pwm_buffer_update_required) {
+        // Firstly we need to unlock the command register and select PG1
+        IS31FL3736_write_register(addr1, ISSI_COMMANDREGISTER_WRITELOCK, 0xC5);
+        IS31FL3736_write_register(addr1, ISSI_COMMANDREGISTER, ISSI_PAGE_PWM);
+
+        IS31FL3736_write_pwm_buffer(addr1, g_pwm_buffer[0]);
+        // IS31FL3736_write_pwm_buffer(addr2, g_pwm_buffer[1]);
+    }
+    g_pwm_buffer_update_required = false;
+}
+
+void IS31FL3736_update_led_control_registers(uint8_t addr1, uint8_t addr2) {
+    if (g_led_control_registers_update_required) {
+        // Firstly we need to unlock the command register and select PG0
+        IS31FL3736_write_register(addr1, ISSI_COMMANDREGISTER_WRITELOCK, 0xC5);
+        IS31FL3736_write_register(addr1, ISSI_COMMANDREGISTER, ISSI_PAGE_LEDCONTROL);
+        for (int i = 0; i < 24; i++) {
+            IS31FL3736_write_register(addr1, i, g_led_control_registers[0][i]);
+            // IS31FL3736_write_register(addr2, i, g_led_control_registers[1][i]);
+        }
+        g_led_control_registers_update_required = false;
+    }
+}