安霸平台gpio扩展芯片aw9523b调试

公司的一个车载项目由于gpio扣较少，所以用了艾为的一颗16路gpio口扩展芯片，下面描述一下调试过程
硬件原理图如下

aw9523b芯片寄存器较少，直接自己写了个简单的gpio驱动，采用gpio子系统驱动，比较简单，下面是dts配置以及驱动源码

dts配置aw9523: aw9523@58 {compatible = "awinic,aw9523_gpio";aw9523_reset-gpios = <&gpio 82 0>;reg = <0x58>;gpio-controller;interrupt-parent = <&gpio>;interrupt-controller;#gpio-cells = <2>;interrupts = <14 0x0>;};驱动源码
// SPDX-License-Identifier: GPL-2.0+
/** gpiolib support for Wolfson WM835x PMICs** Copyright 2009 Wolfson Microelectronics PLC.** Author: Mark Brown <broonie@opensource.wolfsonmicro.com>**/#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/gpio/driver.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/leds.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/gpio/consumer.h>
#include <linux/of_gpio.h>
#include <linux/gpio.h>
#include <linux/regulator/consumer.h>/* aw9523 register */
#define AW9523_REG_CHIPID 0x10
#define AW9523_LED_MODE_P0 0x12
#define AW9523_LED_MODE_P1 0x13
#define AW9523_LED_MODE 0x00
#define AW9523_CHIPID 0x23
#define AW9523_REG_MAX 0x7F
#define AW9523_REG_BRIGHTNESS_BASE 0x20struct aw9523_gpio {int aw9523_init_finished;int reset_gpio;struct gpio_desc *aw9523_rst_gpio;struct i2c_client *aw9523_client;struct gpio_chip aw9523_gpio_chip;struct device dev;spinlock_t lock;
};static u8 reg_read(struct aw9523_gpio *aw9523_gpio_dev, u8 reg)
{u8 buf;int ret;struct i2c_msg msgs[] = {{.addr  = aw9523_gpio_dev->aw9523_client->addr,.flags = 0,.len   = 1,.buf   = &reg,}, {.addr  = aw9523_gpio_dev->aw9523_client->addr,.flags = I2C_M_RD,.len   = 1,.buf   = &buf,},};ret = i2c_transfer(aw9523_gpio_dev->aw9523_client->adapter, msgs, ARRAY_SIZE(msgs));if (ret < 0) {dev_err(&aw9523_gpio_dev->aw9523_client->dev, "aw9523 Reading register %x from %x failed\n",reg, aw9523_gpio_dev->aw9523_client->addr);return ret;}return buf;
}static int aw9523_read_reg(struct aw9523_gpio *aw9523_gpio_dev, u8 reg)
{int rc;rc = reg_read(aw9523_gpio_dev,reg);dev_err(&aw9523_gpio_dev->aw9523_client->dev,"aw9523 read reg = %02x, value = %02x****\n",reg,rc);rc = i2c_smbus_read_byte_data(aw9523_gpio_dev->aw9523_client, reg);if (rc < 0) {dev_err(&aw9523_gpio_dev->aw9523_client->dev,"<%s> can't read from %02x, i2c addr= %02x\n", __func__, reg, aw9523_gpio_dev->aw9523_client->addr);return -rc;}return rc;
}static int aw9523_write_reg(struct aw9523_gpio *aw9523_gpio_dev, u8 reg, u8 val)
{int rc;rc = i2c_smbus_write_byte_data(aw9523_gpio_dev->aw9523_client, reg,val);if (rc < 0) {dev_err(&aw9523_gpio_dev->aw9523_client->dev,"<%s> can't write %02x to %02x\n", __func__, val, reg);return -rc;}return 0;
}static int aw9523_check_chipid(struct aw9523_gpio *aw9523_gpio_dev)
{u8 val;u8 cnt;for (cnt = 5; cnt > 0; cnt--) {val = aw9523_read_reg(aw9523_gpio_dev, AW9523_REG_CHIPID);dev_err(&aw9523_gpio_dev->aw9523_client->dev,"<%s> aw9523 chip id %0x\n", __func__, val);if (val == AW9523_CHIPID)return 0;}return -EINVAL;
}
int aw9523_gpio_get_value(struct aw9523_gpio *aw9523_gpio_dev, int port)
{u8 val;int value;if (aw9523_gpio_dev->aw9523_init_finished == 0) {dev_err(&aw9523_gpio_dev->aw9523_client->dev,"<%s> aw9523 is not inited\n", __func__);return -EPERM;}if (port < 0 || port > 15) {dev_err(&aw9523_gpio_dev->aw9523_client->dev,"<%s> invalid port: %d\n", __func__, port);return -EINVAL;}if (value != 0 && value != 1) {dev_err(&aw9523_gpio_dev->aw9523_client->dev,"<%s> invalid value\n", __func__);return -EINVAL;}val = (u8)aw9523_read_reg(aw9523_gpio_dev, 0x02 + port / 8);value = (val >> port) & 1;return value;
}int aw9523_gpio_set_value(struct aw9523_gpio *aw9523_gpio_dev, int port,int value)
{u8 val;if (aw9523_gpio_dev->aw9523_init_finished == 0) {dev_err(&aw9523_gpio_dev->aw9523_client->dev,"<%s> aw9523 is not inited\n", __func__);return -EPERM;}if (port < 0 || port > 15) {dev_err(&aw9523_gpio_dev->aw9523_client->dev,"<%s> invalid port: %d\n", __func__, port);return -EINVAL;}if (value != 0 && value != 1) {dev_err(&aw9523_gpio_dev->aw9523_client->dev,"<%s> invalid value\n", __func__);return -EINVAL;}//   val = (u8)aw9523_read_reg(aw9523_gpio_dev, 0x02 + port / 8);if (value == 0)val &= ~(1 << (port % 8));elseval |= 1 << (port % 8);dev_err(&aw9523_gpio_dev->aw9523_client->dev,"<%s> begin to write reg\n", __func__);return aw9523_write_reg(aw9523_gpio_dev, 0x02 + port / 8, val);
}static int aw9523_gpio_get(struct gpio_chip *chip, unsigned int offset)
{int value;unsigned long flags;struct aw9523_gpio *aw9523_gpio_dev =container_of(chip, struct aw9523_gpio, aw9523_gpio_chip);spin_lock_irqsave(&aw9523_gpio_dev->lock, flags);value = aw9523_gpio_get_value(aw9523_gpio_dev, offset);spin_unlock_irqrestore(&aw9523_gpio_dev->lock, flags);return value;
}static void aw9523_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
{unsigned long flags;struct aw9523_gpio *aw9523_gpio_dev =container_of(chip, struct aw9523_gpio, aw9523_gpio_chip);spin_lock_irqsave(&aw9523_gpio_dev->lock, flags);aw9523_gpio_set_value(aw9523_gpio_dev, offset, value);spin_unlock_irqrestore(&aw9523_gpio_dev->lock, flags);
}static int aw9523_gpio_direction_out(struct gpio_chip *chip, unsigned offset,int value)
{unsigned long flags;struct aw9523_gpio *aw9523_gpio_dev =container_of(chip, struct aw9523_gpio, aw9523_gpio_chip);spin_lock_irqsave(&aw9523_gpio_dev->lock, flags);dev_err(&aw9523_gpio_dev->aw9523_client->dev,"%s:offset = %d,value = %d\n", __func__, offset, value);aw9523_gpio_set_value(aw9523_gpio_dev, offset, value);spin_unlock_irqrestore(&aw9523_gpio_dev->lock, flags);return 0;
}static ssize_t aw9523_gpio_store(struct device *dev,struct device_attribute *attr, const char *buf, size_t count)
{int rc;int port;int value;char port_buf[5];char value_buf[5];struct i2c_client *client =container_of(dev, struct i2c_client, dev);struct aw9523_gpio *aw9523_gpio_dev =i2c_get_clientdata(client);if (count < 2) {pr_err("<%s> invalid write string: %s\n", __func__, buf);return -EINVAL;}sscanf(buf,"%s %s",port_buf,value_buf);rc = kstrtouint(port_buf, 10, &port);rc = kstrtouint(value_buf, 10, &value);dev_err(dev, "%s:bing port = %d value = %d addr = %02x\n",__func__,port,value,aw9523_gpio_dev->aw9523_client->addr);rc = aw9523_gpio_set_value(aw9523_gpio_dev, port, value);return (rc == 0) ? count : -EINVAL;
}static DEVICE_ATTR(aw9523_gpio, S_IWUSR | S_IWGRP, NULL, aw9523_gpio_store);static int aw9523_gpio_probe(struct i2c_client *client,const struct i2c_device_id *id)
{int ret;enum of_gpio_flags flags;int i;struct aw9523_gpio *aw9523_gpio_dev;aw9523_gpio_dev = devm_kzalloc(&client->dev, (sizeof(struct aw9523_gpio)), GFP_KERNEL);if (!aw9523_gpio_dev)return -ENOMEM;aw9523_gpio_dev->aw9523_client = client;aw9523_gpio_dev->aw9523_rst_gpio =devm_gpiod_get_optional(&client->dev, "aw9523_reset", 0);if (!aw9523_gpio_dev->aw9523_rst_gpio) {dev_err(&client->dev, "invalid  reset gpio\n");return -1;} else {gpiod_direction_output(aw9523_gpio_dev->aw9523_rst_gpio, 1);msleep(20);gpiod_direction_output(aw9523_gpio_dev->aw9523_rst_gpio, 0);msleep(30);gpiod_direction_output(aw9523_gpio_dev->aw9523_rst_gpio, 1);msleep(20);}aw9523_gpio_dev->aw9523_gpio_chip.label = "aw9523_gpio";aw9523_gpio_dev->aw9523_gpio_chip.owner = THIS_MODULE;aw9523_gpio_dev->aw9523_gpio_chip.direction_output =aw9523_gpio_direction_out;aw9523_gpio_dev->aw9523_gpio_chip.set = aw9523_gpio_set;aw9523_gpio_dev->aw9523_gpio_chip.get = aw9523_gpio_get;aw9523_gpio_dev->aw9523_gpio_chip.ngpio = 16;aw9523_gpio_dev->aw9523_gpio_chip.parent = &client->dev;aw9523_gpio_dev->aw9523_gpio_chip.base = -1;ret = devm_gpiochip_add_data(&client->dev,&(aw9523_gpio_dev->aw9523_gpio_chip),&(aw9523_gpio_dev->aw9523_gpio_chip));if (ret) {dev_err(&client->dev, "devm_gpiochip_add_data error\n");return -EINVAL;}ret = aw9523_check_chipid(aw9523_gpio_dev);if (ret) {dev_err(&client->dev, "Check chip id error\n");return -EINVAL;}// set P0 port as push-pull modeaw9523_write_reg(aw9523_gpio_dev, 0x11, 0x10);aw9523_write_reg(aw9523_gpio_dev, 0x12, 0xff);aw9523_write_reg(aw9523_gpio_dev, 0x13, 0xff);// P0 and P1 port output modeaw9523_write_reg(aw9523_gpio_dev, 0x04, 0x00);aw9523_write_reg(aw9523_gpio_dev, 0x05, 0x00);// disable interrupt function of P0 and P1 portaw9523_write_reg(aw9523_gpio_dev, 0x06, 0xff);aw9523_write_reg(aw9523_gpio_dev, 0x07, 0xff);// P0 and P1 port output low levelaw9523_write_reg(aw9523_gpio_dev, 0x02, 0x00);aw9523_write_reg(aw9523_gpio_dev, 0x03, 0x00);spin_lock_init(&aw9523_gpio_dev->lock);aw9523_gpio_dev->aw9523_init_finished = 1;i2c_set_clientdata(client, aw9523_gpio_dev);ret = device_create_file(&client->dev, &dev_attr_aw9523_gpio);if (ret) {pr_err("<%s> create file aw9523_gpio failed\n", __func__);return -EPERM;}dev_err(&client->dev, "aw9523_probe succeeded\n");return 0;
}static int aw9523_gpio_remove(struct i2c_client *client)
{return 0;
}static const struct of_device_id aw9523_match_table[] = {{.compatible = "awinic,aw9523_gpio",},{},
};static const struct i2c_device_id aw9523_id[] = {{ "awinic,aw9523_gpio", 0 },{},
};
MODULE_DEVICE_TABLE(i2c, aw9523_id);static struct i2c_driver aw9523_driver = {.driver = {.name = "aw9523-gpio",.owner      = THIS_MODULE,.of_match_table = aw9523_match_table,},.probe    = aw9523_gpio_probe,.remove   = aw9523_gpio_remove,.id_table = aw9523_id,
};module_i2c_driver(aw9523_driver);
MODULE_LICENSE("GPL V2");```c
在这里插入代码片

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安霸平台gpio扩展芯片aw9523b调试

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