diff options
Diffstat (limited to 'drivers/led/snled27351-simple.c')
| -rw-r--r-- | drivers/led/snled27351-simple.c | 220 |
1 files changed, 220 insertions, 0 deletions
diff --git a/drivers/led/snled27351-simple.c b/drivers/led/snled27351-simple.c new file mode 100644 index 0000000000..499769555c --- /dev/null +++ b/drivers/led/snled27351-simple.c @@ -0,0 +1,220 @@ +/* Copyright 2021 @ Keychron (https://www.keychron.com) + * + * 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 "snled27351-simple.h" +#include "i2c_master.h" + +#ifndef SNLED27351_I2C_TIMEOUT +# define SNLED27351_I2C_TIMEOUT 100 +#endif + +#ifndef SNLED27351_I2C_PERSISTENCE +# define SNLED27351_I2C_PERSISTENCE 0 +#endif + +#ifndef SNLED27351_PHASE_CHANNEL +# define SNLED27351_PHASE_CHANNEL SNLED27351_MSKPHASE_12CHANNEL +#endif + +#ifndef SNLED27351_CURRENT_TUNE +# define SNLED27351_CURRENT_TUNE \ + { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF } +#endif + +// Transfer buffer for TWITransmitData() +uint8_t g_twi_transfer_buffer[20]; + +// These buffers match the SNLED27351 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 snled27351_write_pwm_buffer() but it's +// probably not worth the extra complexity. +uint8_t g_pwm_buffer[SNLED27351_DRIVER_COUNT][192]; +bool g_pwm_buffer_update_required[SNLED27351_DRIVER_COUNT] = {false}; + +uint8_t g_led_control_registers[SNLED27351_DRIVER_COUNT][24] = {0}; +bool g_led_control_registers_update_required[SNLED27351_DRIVER_COUNT] = {false}; + +bool snled27351_write_register(uint8_t addr, uint8_t reg, uint8_t data) { + // If the transaction fails function returns false. + g_twi_transfer_buffer[0] = reg; + g_twi_transfer_buffer[1] = data; + +#if SNLED27351_I2C_PERSISTENCE > 0 + for (uint8_t i = 0; i < SNLED27351_I2C_PERSISTENCE; i++) { + if (i2c_transmit(addr << 1, g_twi_transfer_buffer, 2, SNLED27351_I2C_TIMEOUT) != 0) { + return false; + } + } +#else + if (i2c_transmit(addr << 1, g_twi_transfer_buffer, 2, SNLED27351_I2C_TIMEOUT) != 0) { + return false; + } +#endif + return true; +} + +bool snled27351_write_pwm_buffer(uint8_t addr, uint8_t *pwm_buffer) { + // Assumes PG1 is already selected. + // If any of the transactions fails function returns false. + // 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 SNLED27351_I2C_PERSISTENCE > 0 + for (uint8_t i = 0; i < SNLED27351_I2C_PERSISTENCE; i++) { + if (i2c_transmit(addr << 1, g_twi_transfer_buffer, 17, SNLED27351_I2C_TIMEOUT) != 0) { + return false; + } + } +#else + if (i2c_transmit(addr << 1, g_twi_transfer_buffer, 17, SNLED27351_I2C_TIMEOUT) != 0) { + return false; + } +#endif + } + return true; +} + +void snled27351_init(uint8_t addr) { + // Select to function page + snled27351_write_register(addr, SNLED27351_REG_CONFIGURE_CMD_PAGE, SNLED27351_FUNCTION_PAGE); + // Setting LED driver to shutdown mode + snled27351_write_register(addr, SNLED27351_REG_CONFIGURATION, SNLED27351_MSKSW_SHUT_DOWN_MODE); + // Setting internal channel pulldown/pullup + snled27351_write_register(addr, SNLED27351_REG_PDU, SNLED27351_MSKSET_CA_CB_CHANNEL); + // Select number of scan phase + snled27351_write_register(addr, SNLED27351_REG_SCAN_PHASE, SNLED27351_PHASE_CHANNEL); + // Setting PWM Delay Phase + snled27351_write_register(addr, SNLED27351_REG_SLEW_RATE_CONTROL_MODE1, SNLED27351_MSKPWM_DELAY_PHASE_ENABLE); + // Setting Driving/Sinking Channel Slew Rate + snled27351_write_register(addr, SNLED27351_REG_SLEW_RATE_CONTROL_MODE2, SNLED27351_MSKDRIVING_SINKING_CHANNEL_SLEWRATE_ENABLE); + // Setting Iref + snled27351_write_register(addr, SNLED27351_REG_SOFTWARE_SLEEP, SNLED27351_MSKSLEEP_DISABLE); + // Set LED CONTROL PAGE (Page 0) + snled27351_write_register(addr, SNLED27351_REG_CONFIGURE_CMD_PAGE, SNLED27351_LED_CONTROL_PAGE); + for (int i = 0; i < SNLED27351_LED_CONTROL_ON_OFF_LENGTH; i++) { + snled27351_write_register(addr, i, 0x00); + } + + // Set PWM PAGE (Page 1) + snled27351_write_register(addr, SNLED27351_REG_CONFIGURE_CMD_PAGE, SNLED27351_LED_PWM_PAGE); + for (int i = 0; i < SNLED27351_LED_CURRENT_TUNE_LENGTH; i++) { + snled27351_write_register(addr, i, 0x00); + } + + // Set CURRENT PAGE (Page 4) + uint8_t current_tune_reg_list[SNLED27351_LED_CURRENT_TUNE_LENGTH] = SNLED27351_CURRENT_TUNE; + snled27351_write_register(addr, SNLED27351_REG_CONFIGURE_CMD_PAGE, SNLED27351_CURRENT_TUNE_PAGE); + for (int i = 0; i < SNLED27351_LED_CURRENT_TUNE_LENGTH; i++) { + snled27351_write_register(addr, i, current_tune_reg_list[i]); + } + + // Enable LEDs ON/OFF + snled27351_write_register(addr, SNLED27351_REG_CONFIGURE_CMD_PAGE, SNLED27351_LED_CONTROL_PAGE); + for (int i = 0; i < SNLED27351_LED_CONTROL_ON_OFF_LENGTH; i++) { + snled27351_write_register(addr, i, 0xFF); + } + + // Select to function page + snled27351_write_register(addr, SNLED27351_REG_CONFIGURE_CMD_PAGE, SNLED27351_FUNCTION_PAGE); + // Setting LED driver to normal mode + snled27351_write_register(addr, SNLED27351_REG_CONFIGURATION, SNLED27351_MSKSW_NORMAL_MODE); +} + +void snled27351_set_value(int index, uint8_t value) { + snled27351_led_t led; + if (index >= 0 && index < LED_MATRIX_LED_COUNT) { + memcpy_P(&led, (&g_snled27351_leds[index]), sizeof(led)); + + if (g_pwm_buffer[led.driver][led.v] == value) { + return; + } + g_pwm_buffer[led.driver][led.v] = value; + g_pwm_buffer_update_required[led.driver] = true; + } +} + +void snled27351_set_value_all(uint8_t value) { + for (int i = 0; i < LED_MATRIX_LED_COUNT; i++) { + snled27351_set_value(i, value); + } +} + +void snled27351_set_led_control_register(uint8_t index, bool value) { + snled27351_led_t led; + memcpy_P(&led, (&g_snled27351_leds[index]), sizeof(led)); + + uint8_t control_register = led.v / 8; + uint8_t bit_value = led.v % 8; + + if (value) { + g_led_control_registers[led.driver][control_register] |= (1 << bit_value); + } else { + g_led_control_registers[led.driver][control_register] &= ~(1 << bit_value); + } + + g_led_control_registers_update_required[led.driver] = true; +} + +void snled27351_update_pwm_buffers(uint8_t addr, uint8_t index) { + if (g_pwm_buffer_update_required[index]) { + snled27351_write_register(addr, SNLED27351_REG_CONFIGURE_CMD_PAGE, SNLED27351_LED_PWM_PAGE); + + // If any of the transactions fail we risk writing dirty PG0, + // refresh page 0 just in case. + if (!snled27351_write_pwm_buffer(addr, g_pwm_buffer[index])) { + g_led_control_registers_update_required[index] = true; + } + } + g_pwm_buffer_update_required[index] = false; +} + +void snled27351_update_led_control_registers(uint8_t addr, uint8_t index) { + if (g_led_control_registers_update_required[index]) { + snled27351_write_register(addr, SNLED27351_REG_CONFIGURE_CMD_PAGE, SNLED27351_LED_CONTROL_PAGE); + for (int i = 0; i < 24; i++) { + snled27351_write_register(addr, i, g_led_control_registers[index][i]); + } + } + g_led_control_registers_update_required[index] = false; +} + +void snled27351_sw_return_normal(uint8_t addr) { + // Select to function page + snled27351_write_register(addr, SNLED27351_REG_CONFIGURE_CMD_PAGE, SNLED27351_FUNCTION_PAGE); + // Setting LED driver to normal mode + snled27351_write_register(addr, SNLED27351_REG_CONFIGURATION, SNLED27351_MSKSW_NORMAL_MODE); +} + +void snled27351_sw_shutdown(uint8_t addr) { + // Select to function page + snled27351_write_register(addr, SNLED27351_REG_CONFIGURE_CMD_PAGE, SNLED27351_FUNCTION_PAGE); + // Setting LED driver to shutdown mode + snled27351_write_register(addr, SNLED27351_REG_CONFIGURATION, SNLED27351_MSKSW_SHUT_DOWN_MODE); + // Write SW Sleep Register + snled27351_write_register(addr, SNLED27351_REG_SOFTWARE_SLEEP, SNLED27351_MSKSLEEP_ENABLE); +} |