drivers: led: Add LED driver support for NXP PCA9633
Add support for NXP PCA9633 an I2C 4-bit LED driver. Supported blinkink period: 41ms to 10667ms 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: Sebastien Bourdelin <sebastien.bourdelin@savoirfairelinux.com>
This commit is contained in:
Sebastien Bourdelin
Maureen Helm
parent
e325510d59
commit
ac1a9c4ef2
5 changed files with 263 additions and 0 deletions
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@ -1,3 +1,4 @@
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zephyr_sources_ifdef(CONFIG_LP3943 lp3943.c)
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zephyr_sources_ifdef(CONFIG_PCA9633 pca9633.c)
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zephyr_sources_ifdef(CONFIG_USERSPACE led_handlers.c)
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@ -42,5 +42,6 @@ config LED_INIT_PRIORITY
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System initialization priority for LED drivers.
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source "drivers/led/Kconfig.lp3943"
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source "drivers/led/Kconfig.pca9633"
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endif # LED
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38
drivers/led/Kconfig.pca9633
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38
drivers/led/Kconfig.pca9633
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@ -0,0 +1,38 @@
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#
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# Copyright (c) 2018 Savoir-Faire Linux
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#
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# SPDX-License-Identifier: Apache-2.0
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#
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menuconfig PCA9633
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bool "PCA9633 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 PCA9633.
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PCA9633 LED driver has 4 channels each with multi-programmable
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states. Each channel can drive up to 25 mA per LED.
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if !HAS_DTS_I2C_DEVICE
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config PCA9633_DEV_NAME
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string "PCA9633 device name"
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default "PCA9633"
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help
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Device name for PCA9633 LED driver.
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config PCA9633_I2C_ADDRESS
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hex "PCA9633 I2C slave address"
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default 0x62
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help
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Specify the I2C slave address for the PCA9633 LED driver.
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config PCA9633_I2C_MASTER_DEV_NAME
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string "I2C master where PCA9633 is connected"
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default "I2C_1"
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help
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Specify the device name of the I2C master device to which
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PCA9633 is connected.
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endif
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206
drivers/led/pca9633.c
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206
drivers/led/pca9633.c
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@ -0,0 +1,206 @@
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/*
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* Copyright (c) 2018 Savoir-Faire Linux.
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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 LED driver for the PCA9633 I2C LED driver (7-bit slave address 0x62)
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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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/* PCA9633 select registers determine the source that drives LED outputs */
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#define PCA9633_LED_OFF 0x0 /* LED driver off */
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#define PCA9633_LED_ON 0x1 /* LED driver on */
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#define PCA9633_LED_PWM 0x2 /* Controlled through PWM */
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#define PCA9633_LED_GRP_PWM 0x3 /* Controlled through PWM/GRPPWM */
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/* PCA9633 control register */
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#define PCA9633_MODE1 0x00
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#define PCA9633_MODE2 0x01
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#define PCA9633_PWM_BASE 0x02
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#define PCA9633_GRPPWM 0x06
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#define PCA9633_GRPFREQ 0x07
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#define PCA9633_LEDOUT 0x08
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/* PCA9633 mode register 2 */
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#define PCA9633_MODE2_DMBLNK 0x20 /* Enable blinking */
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#define PCA9633_MASK 0x03
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struct pca9633_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 pca9633_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 pca9633_data *data = dev->driver_data;
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struct led_data *dev_data = &data->dev_data;
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u8_t gdc, gfrq;
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u32_t period;
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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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/*
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* From manual:
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* duty cycle = (GDC / 256) ->
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* (time_on / period) = (GDC / 256) ->
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* GDC = ((time_on * 256) / period)
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*/
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gdc = delay_on * 256 / period;
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if (i2c_reg_write_byte(data->i2c, CONFIG_PCA9633_I2C_ADDRESS,
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PCA9633_GRPPWM,
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gdc)) {
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SYS_LOG_ERR("LED reg write failed");
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return -EIO;
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}
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/*
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* From manual:
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* period = ((GFRQ + 1) / 24) in seconds.
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* So, period (in ms) = (((GFRQ + 1) / 24) * 1000) ->
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* GFRQ = ((period * 24 / 1000) - 1)
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*/
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gfrq = (period * 24 / 1000) - 1;
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if (i2c_reg_write_byte(data->i2c, CONFIG_PCA9633_I2C_ADDRESS,
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PCA9633_GRPFREQ,
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gfrq)) {
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SYS_LOG_ERR("LED reg write failed");
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return -EIO;
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}
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/* Enable blinking mode */
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if (i2c_reg_update_byte(data->i2c, CONFIG_PCA9633_I2C_ADDRESS,
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PCA9633_MODE2,
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PCA9633_MODE2_DMBLNK,
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PCA9633_MODE2_DMBLNK)) {
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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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/* Select the GRPPWM source to drive the LED outpout */
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if (i2c_reg_update_byte(data->i2c, CONFIG_PCA9633_I2C_ADDRESS,
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PCA9633_LEDOUT,
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PCA9633_MASK << (led << 1),
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PCA9633_LED_GRP_PWM << (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 pca9633_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 pca9633_data *data = dev->driver_data;
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struct led_data *dev_data = &data->dev_data;
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u8_t val;
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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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/* Set the LED brightness value */
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val = (value * 255) / dev_data->max_brightness;
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if (i2c_reg_write_byte(data->i2c, CONFIG_PCA9633_I2C_ADDRESS,
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PCA9633_PWM_BASE + led,
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val)) {
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SYS_LOG_ERR("LED reg write failed");
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return -EIO;
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}
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/* Set the LED driver to be controlled through its PWMx register. */
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if (i2c_reg_update_byte(data->i2c, CONFIG_PCA9633_I2C_ADDRESS,
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PCA9633_LEDOUT,
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PCA9633_MASK << (led << 1),
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PCA9633_LED_PWM << (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 pca9633_led_on(struct device *dev, u32_t led)
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{
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struct pca9633_data *data = dev->driver_data;
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/* Set LED state to ON */
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if (i2c_reg_update_byte(data->i2c, CONFIG_PCA9633_I2C_ADDRESS,
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PCA9633_LEDOUT,
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PCA9633_MASK << (led << 1),
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PCA9633_LED_ON << (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 pca9633_led_off(struct device *dev, u32_t led)
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{
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struct pca9633_data *data = dev->driver_data;
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/* Set LED state to OFF */
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if (i2c_reg_update_byte(data->i2c, CONFIG_PCA9633_I2C_ADDRESS,
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PCA9633_LEDOUT,
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PCA9633_MASK << (led << 1),
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PCA9633_LED_OFF)) {
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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 pca9633_led_init(struct device *dev)
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{
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struct pca9633_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_PCA9633_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 = 41;
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dev_data->max_period = 10667;
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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 pca9633_data pca9633_led_data;
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static const struct led_driver_api pca9633_led_api = {
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.blink = pca9633_led_blink,
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.set_brightness = pca9633_led_set_brightness,
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.on = pca9633_led_on,
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.off = pca9633_led_off,
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};
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DEVICE_AND_API_INIT(pca9633_led, CONFIG_PCA9633_DEV_NAME,
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&pca9633_led_init, &pca9633_led_data,
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NULL, POST_KERNEL, CONFIG_LED_INIT_PRIORITY,
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&pca9633_led_api);
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17
dts/bindings/led/nxp,pca9633.yaml
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17
dts/bindings/led/nxp,pca9633.yaml
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@ -0,0 +1,17 @@
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---
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title: NXP PCA9633 LED Driver
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id: nxp,pca9633
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version: 0.1
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description: NXP PCA9633 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: "nxp,pca9633"
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...
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