drivers: led: Add LED driver support for TI LP3943
Add support for Texas Instruments LP3943 - 16 channel LED driver. Supported blinking period: 0 to 1600ms Supported brightness value: 0 to 100% This driver supports the following APIs: 1. led_blink 2. led_set_brightness 3. led_on 4. led_off Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
This commit is contained in:
Manivannan Sadhasivam
Maureen Helm
parent
94bba071d6
commit
bb394bbafb
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@ -72,6 +72,12 @@
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&i2c3 {
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clock-frequency = <I2C_BITRATE_FAST>;
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lp3943@60 {
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compatible = "ti,lp3943";
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reg = <0x60>;
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label = "LP3943";
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};
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};
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&spi1 {
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@ -7,3 +7,4 @@
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config BOARD_96B_NEONKEY
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bool "96Boards Neonkey"
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depends on SOC_STM32F411XE
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select HAS_DTS_I2C_DEVICE
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9
boards/arm/96b_neonkey/dts.fixup
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9
boards/arm/96b_neonkey/dts.fixup
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@ -0,0 +1,9 @@
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/* This file is a temporary workaround for mapping of the generated information
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* to the current driver definitions. This will be removed when the drivers
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* are modified to handle the generated information, or the mapping of
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* generated data matches the driver definitions.
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*/
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#define CONFIG_LP3943_DEV_NAME ST_STM32_I2C_V1_40005C00_TI_LP3943_60_LABEL
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#define CONFIG_LP3943_I2C_ADDRESS ST_STM32_I2C_V1_40005C00_TI_LP3943_60_BASE_ADDRESS
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#define CONFIG_LP3943_I2C_MASTER_DEV_NAME ST_STM32_I2C_V1_40005C00_TI_LP3943_60_BUS_NAME
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@ -1 +1 @@
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# Nothing here (yet)
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zephyr_sources_ifdef(CONFIG_LP3943 lp3943.c)
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@ -10,7 +10,7 @@ menuconfig LED
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bool "LED drivers"
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default n
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help
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Include LED drivers in the system configuration.
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Include LED drivers in the system configuration.
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if LED
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@ -20,14 +20,20 @@ config SYS_LOG_LED_LEVEL
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default 0
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range 0 4
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help
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Sets the log level for LED drivers. You must have
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system logging enabled.
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Levels are:
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0 OFF, do not write
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1 ERROR, only write SYS_LOG_ERR
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2 WARNING, write SYS_LOG_WRN in addition to previous level
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3 INFO, write SYS_LOG_INF in addition to previous levels
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4 DEBUG, write SYS_LOG_DBG in addition to previous levels
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Sets the log level for LED drivers. You must have
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system logging enabled.
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Levels are:
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- 0 OFF, do not write
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- 1 ERROR, only write SYS_LOG_ERR
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- 2 WARNING, write SYS_LOG_WRN in addition to previous level
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- 3 INFO, write SYS_LOG_INF in addition to previous levels
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- 4 DEBUG, write SYS_LOG_DBG in addition to previous levels
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config LED_INIT_PRIORITY
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int "LED initialization priority"
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@ -35,4 +41,6 @@ config LED_INIT_PRIORITY
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help
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System initialization priority for LED drivers.
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source "drivers/led/Kconfig.lp3943"
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endif # LED
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48
drivers/led/Kconfig.lp3943
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48
drivers/led/Kconfig.lp3943
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@ -0,0 +1,48 @@
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#
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# Copyright (c) 2018 Linaro Limited
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#
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# SPDX-License-Identifier: Apache-2.0
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#
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menuconfig LP3943
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bool "LP3943 LED driver"
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depends on I2C
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default n
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help
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Enable LED driver for LP3943.
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LP3943 LED driver has 16 channels each with multi-programmable
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states at a specified rate. Each channel can drive upto 25 mA
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per LED.
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if !HAS_DTS_I2C_DEVICE
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config LP3943_DEV_NAME
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string "LP3943 device name"
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default "LP3943"
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help
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Device name for LP3943 LED driver.
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config LP3943_I2C_ADDRESS
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hex "LP3943 I2C slave address"
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range 0x60 0x67
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default 0x60
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help
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Specify the I2C slave address for the LP3943 LED driver.
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0x60: ADR0 = 0, ADR1 = 0, ADR2 = 0
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0x61: ADR0 = 0, ADR1 = 0, ADR2 = 1
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0x62: ADR0 = 0, ADR1 = 1, ADR2 = 0
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0x63: ADR0 = 0, ADR1 = 1, ADR2 = 1
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0x64: ADR0 = 1, ADR1 = 0, ADR2 = 0
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0x65: ADR0 = 1, ADR1 = 0, ADR2 = 1
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0x66: ADR0 = 1, ADR1 = 1, ADR2 = 0
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0x67: ADR0 = 1, ADR1 = 1, ADR2 = 1
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config LP3943_I2C_MASTER_DEV_NAME
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string "I2C master where LP3943 is connected"
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default "I2C_0"
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help
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Specify the device name of the I2C master device to which
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LP3943 is connected.
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endif
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263
drivers/led/lp3943.c
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263
drivers/led/lp3943.c
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@ -0,0 +1,263 @@
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/*
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* Copyright (c) 2018 Linaro Ltd.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/**
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* @file
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* @brief LP3943 LED driver
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*
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* Limitations:
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* - Blink period and brightness value are controlled by two sets of PSCx/PWMx
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* registers. This driver partitions the available LEDs into two groups as
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* 0 to 7 and 8 to 15 and assigns PSC0/PWM0 to LEDs from 0 to 7 and PSC1/PWM1
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* to LEDs from 8 to 15. So, it is not possible to set unique blink period
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* and brightness value for LEDs in a group, changing either of these
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* values for a LED will affect other LEDs also.
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*/
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#include <i2c.h>
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#include <led.h>
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#include <misc/util.h>
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#include <zephyr.h>
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#define SYS_LOG_LEVEL CONFIG_SYS_LOG_LED_LEVEL
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#include <logging/sys_log.h>
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#include "led_context.h"
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/* LP3943 Registers */
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#define LP3943_INPUT_1 0x00
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#define LP3943_INPUT_2 0x01
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#define LP3943_PSC0 0x02
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#define LP3943_PWM0 0x03
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#define LP3943_PSC1 0x04
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#define LP3943_PWM1 0x05
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#define LP3943_LS0 0x06
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#define LP3943_LS1 0x07
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#define LP3943_LS2 0x08
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#define LP3943_LS3 0x09
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#define LP3943_MASK 0x03
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enum lp3943_modes {
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LP3943_OFF,
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LP3943_ON,
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LP3943_DIM0,
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LP3943_DIM1,
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};
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struct lp3943_data {
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struct device *i2c;
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struct led_data dev_data;
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};
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static int lp3943_get_led_reg(u32_t *led, u8_t *reg)
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{
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switch (*led) {
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case 0 ... 3:
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*reg = LP3943_LS0;
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break;
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case 4 ... 7:
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*reg = LP3943_LS1;
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*led -= 4;
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break;
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case 8 ... 11:
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*reg = LP3943_LS2;
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*led -= 8;
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break;
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case 12 ... 15:
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*reg = LP3943_LS3;
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*led -= 12;
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break;
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default:
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SYS_LOG_ERR("Invalid LED specified");
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return -EINVAL;
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}
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return 0;
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}
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static int lp3943_set_dim_states(struct lp3943_data *data, u32_t led, u8_t mode)
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{
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int ret;
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u8_t reg;
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ret = lp3943_get_led_reg(&led, ®);
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if (ret) {
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return ret;
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}
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/* Set DIMx states for the LEDs */
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if (i2c_reg_update_byte(data->i2c, CONFIG_LP3943_I2C_ADDRESS, reg,
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LP3943_MASK << (led << 1),
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mode << (led << 1))) {
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SYS_LOG_ERR("LED reg update failed");
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return -EIO;
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}
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return 0;
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}
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static int lp3943_led_blink(struct device *dev, u32_t led,
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u32_t delay_on, u32_t delay_off)
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{
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struct lp3943_data *data = dev->driver_data;
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struct led_data *dev_data = &data->dev_data;
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int ret;
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u16_t period;
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u8_t reg, val, mode;
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period = delay_on + delay_off;
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if (period < dev_data->min_period || period > dev_data->max_period) {
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return -EINVAL;
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}
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/* Use DIM0 for LEDs 0 to 7 and DIM1 for LEDs 8 to 15 */
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if (led < 8) {
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mode = LP3943_DIM0;
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} else {
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mode = LP3943_DIM1;
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}
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if (mode == LP3943_DIM0) {
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reg = LP3943_PSC0;
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} else {
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reg = LP3943_PSC1;
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}
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val = (period * 255) / dev_data->max_period;
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if (i2c_reg_write_byte(data->i2c, CONFIG_LP3943_I2C_ADDRESS,
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reg, val)) {
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SYS_LOG_ERR("LED write failed");
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return -EIO;
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}
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ret = lp3943_set_dim_states(data, led, mode);
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if (ret) {
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return ret;
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}
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return 0;
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}
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static int lp3943_led_set_brightness(struct device *dev, u32_t led,
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u8_t value)
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{
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struct lp3943_data *data = dev->driver_data;
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struct led_data *dev_data = &data->dev_data;
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int ret;
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u8_t reg, val, mode;
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if (value < dev_data->min_brightness ||
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value > dev_data->max_brightness) {
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return -EINVAL;
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}
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/* Use DIM0 for LEDs 0 to 7 and DIM1 for LEDs 8 to 15 */
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if (led < 8) {
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mode = LP3943_DIM0;
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} else {
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mode = LP3943_DIM1;
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}
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if (mode == LP3943_DIM0) {
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reg = LP3943_PWM0;
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} else {
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reg = LP3943_PWM1;
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}
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val = (value * 255) / dev_data->max_brightness;
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if (i2c_reg_write_byte(data->i2c, CONFIG_LP3943_I2C_ADDRESS,
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reg, val)) {
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SYS_LOG_ERR("LED write failed");
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return -EIO;
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}
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ret = lp3943_set_dim_states(data, led, mode);
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if (ret) {
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return ret;
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}
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return 0;
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}
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static inline int lp3943_led_on(struct device *dev, u32_t led)
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{
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struct lp3943_data *data = dev->driver_data;
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int ret;
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u8_t reg, mode;
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ret = lp3943_get_led_reg(&led, ®);
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if (ret) {
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return ret;
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}
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/* Set LED state to ON */
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mode = LP3943_ON;
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if (i2c_reg_update_byte(data->i2c, CONFIG_LP3943_I2C_ADDRESS, reg,
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LP3943_MASK << (led << 1),
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mode << (led << 1))) {
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SYS_LOG_ERR("LED reg update failed");
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return -EIO;
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}
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return 0;
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}
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static inline int lp3943_led_off(struct device *dev, u32_t led)
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{
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struct lp3943_data *data = dev->driver_data;
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int ret;
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u8_t reg;
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ret = lp3943_get_led_reg(&led, ®);
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if (ret) {
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return ret;
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}
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/* Set LED state to OFF */
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if (i2c_reg_update_byte(data->i2c, CONFIG_LP3943_I2C_ADDRESS, reg,
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LP3943_MASK << (led << 1), 0)) {
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SYS_LOG_ERR("LED reg update failed");
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return -EIO;
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}
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return 0;
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}
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static int lp3943_led_init(struct device *dev)
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{
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struct lp3943_data *data = dev->driver_data;
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struct led_data *dev_data = &data->dev_data;
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data->i2c = device_get_binding(CONFIG_LP3943_I2C_MASTER_DEV_NAME);
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if (data->i2c == NULL) {
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SYS_LOG_DBG("Failed to get I2C device");
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return -EINVAL;
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}
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/* Hardware specific limits */
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dev_data->min_period = 0;
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dev_data->max_period = 1600;
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dev_data->min_brightness = 0;
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dev_data->max_brightness = 100;
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return 0;
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}
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static struct lp3943_data lp3943_led_data;
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static const struct led_driver_api lp3943_led_api = {
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.blink = lp3943_led_blink,
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.set_brightness = lp3943_led_set_brightness,
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.on = lp3943_led_on,
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.off = lp3943_led_off,
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};
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DEVICE_AND_API_INIT(lp3943_led, CONFIG_LP3943_DEV_NAME,
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&lp3943_led_init, &lp3943_led_data,
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NULL, POST_KERNEL, CONFIG_LED_INIT_PRIORITY,
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&lp3943_led_api);
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17
dts/bindings/led/ti,lp3943.yaml
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17
dts/bindings/led/ti,lp3943.yaml
Normal file
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@ -0,0 +1,17 @@
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---
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title: TI LP3943 LED Driver
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id: ti,lp3943
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version: 0.1
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description: TI LP3943 LED binding
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inherits:
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!include i2c-device.yaml
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properties:
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compatible:
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type: string
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category: required
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description: compatible strings
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constraint: "ti,lp3943"
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...
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