mirror of
https://github.com/FunKey-Project/fkgpiod.git
synced 2025-12-12 16:08:51 +01:00
122 lines
3.6 KiB
C
Executable File
122 lines
3.6 KiB
C
Executable File
/*
|
|
Copyright (C) 2020-2021 Vincent Buso <vincent.buso@funkey-project.com>
|
|
Copyright (C) 2021 Michel Stempin <michel.stempin@funkey-project.com>
|
|
|
|
This file is part of the FunKey S GPIO keyboard daemon.
|
|
|
|
This is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The software 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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, write to the Free
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA.
|
|
*/
|
|
|
|
/**
|
|
* @file gpio_axp209.c
|
|
* This is the userland GPIO driver for the AXP209 PMIC
|
|
*/
|
|
|
|
#include <fcntl.h>
|
|
#include <stdio.h>
|
|
#include <syslog.h>
|
|
#include <unistd.h>
|
|
#include <linux/input.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/i2c-dev.h>
|
|
#include "gpio_axp209.h"
|
|
#include "smbus.h"
|
|
|
|
//#define DEBUG_AXP209
|
|
#define ERROR_AXP209
|
|
|
|
#ifdef DEBUG_AXP209
|
|
#define FK_DEBUG(...) syslog(LOG_DEBUG, __VA_ARGS__);
|
|
#else
|
|
#define FK_DEBUG(...)
|
|
#endif
|
|
|
|
#ifdef ERROR_AXP209
|
|
#define FK_ERROR(...) syslog(LOG_ERR, __VA_ARGS__);
|
|
#else
|
|
#define FK_ERROR(...)
|
|
#endif
|
|
|
|
/* AXP209 I2C PMIC pseudo-file descriptor */
|
|
static int fd_axp209;
|
|
|
|
/* The I2C bus pseudo-file name */
|
|
static const char i2c0_sysfs_filename[] = "/dev/i2c-0";
|
|
|
|
/* Initialize the AXP209 PMIC chip */
|
|
bool axp209_init(void)
|
|
{
|
|
/* Open the I2C bus pseudo-file */
|
|
if ((fd_axp209 = open(i2c0_sysfs_filename,O_RDWR)) < 0) {
|
|
FK_ERROR("Failed to open the I2C bus %s", i2c0_sysfs_filename);
|
|
return false;
|
|
}
|
|
|
|
/* Acquire the bus access for the AXP209 PMIC chip */
|
|
if (ioctl(fd_axp209, I2C_SLAVE, AXP209_I2C_ADDR) < 0) {
|
|
FK_DEBUG("Failed to acquire bus access and/or talk to slave, trying to force it\n");
|
|
if (ioctl(fd_axp209, I2C_SLAVE_FORCE, AXP209_I2C_ADDR) < 0) {
|
|
FK_ERROR("Failed to acquire FORCED bus access and/or talk to slave.\n");
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/* Set PEK Long press delay to 2.5s */
|
|
if (i2c_smbus_write_byte_data(fd_axp209, AXP209_REG_PEK_PARAMS, 0x9F) < 0) {
|
|
FK_ERROR("Cannot set AXP209 PEK Long press delay to 2.5s\n");
|
|
}
|
|
|
|
/* Set N_OE Shutdown delay to 3s*/
|
|
if (i2c_smbus_write_byte_data(fd_axp209, AXP209_REG_32H, 0x47) < 0) {
|
|
FK_ERROR("Cannot set AXP209 N_OE Shutdown delay to 3s\n");
|
|
}
|
|
|
|
/* Enable only chosen interrupts (PEK short and long presses)*/
|
|
if (i2c_smbus_write_byte_data(fd_axp209, AXP209_INTERRUPT_BANK_3_ENABLE,
|
|
0x03) < 0) {
|
|
FK_ERROR("Cannot intiialize interrupt bank 3 for AXP209\n");
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/* Deinitialize the AXP209 PMIC chip */
|
|
bool axp209_deinit(void)
|
|
{
|
|
|
|
/* Close the I2C bus pseudo-file */
|
|
close(fd_axp209);
|
|
return true;
|
|
}
|
|
|
|
/* Read the AXP209 PMIC chip interrupt register bank 3 */
|
|
int axp209_read_interrupt_bank_3(void)
|
|
{
|
|
int value, result;
|
|
|
|
value = i2c_smbus_read_byte_data(fd_axp209, AXP209_INTERRUPT_BANK_3_STATUS);
|
|
if (value < 0) {
|
|
return value;
|
|
}
|
|
|
|
/* Clear the interrupts */
|
|
result = i2c_smbus_write_byte_data(fd_axp209, AXP209_INTERRUPT_BANK_3_STATUS, 0xFF);
|
|
if (result < 0) {
|
|
return result;
|
|
}
|
|
FK_DEBUG("READ AXP209_INTERRUPT_BANK_3_STATUS: 0x%02X\n", value);
|
|
return value & 0xFF;
|
|
}
|