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/* SPDX-License-Identifier: BSD-2-Clause */
/*
* Copyright (C) 2023 embedded brains GmbH & Co. KG
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef LIBCHIP_MCP7940M_RTC_H
#define LIBCHIP_MCP7940M_RTC_H
#include <rtems.h>
#include <rtems/thread.h>
#include <libchip/rtc.h>
#include <stdint.h>
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
extern const rtc_fns rtc_mcp7940m_fns;
bool rtc_mcp7940m_probe(int minor);
/*
* It is expected, that the RTC can be accessed as a raw file. A pointer to a
* constant string with the name of that device has to be passed to the table
* initializer.
*
* The MCP7940M uses an EEPROM-like interface. So you could for example use the
* following initialization:
*
* Define a context for the RTC somewhere:
*
* static struct mcp7940m_rtc rtc_ctx =
* MCP7940M_RTC_INITIALIZER("/dev/i2c-1", 0x6F, true);
*
* Then you can use the following for the RTC_Table:
*
* MCP7940M_RTC_TBL_ENTRY("/dev/rtc", &rtc_ctx)
*/
struct mcp7940m_rtc {
/** Just initialize with RTEMS_MUTEX_INITIALIZER('mcp7940'). */
rtems_mutex mutex;
/** The path of the I2C bus device. */
const char *i2c_bus_path;
/** I2C address. */
uint8_t i2c_addr;
/** True if a crystal should be used. False if an oscillator is connected. */
bool crystal;
/** Whether the RTC has already been initialized. Used internally. */
bool initialized;
};
#define MCP7940M_RTC_INITIALIZER(i2c_path, i2c_address, has_crystal) { \
.mutex = RTEMS_MUTEX_INITIALIZER("mcp7940m"), \
.i2c_bus_path = i2c_path, \
.i2c_addr = i2c_address, \
.crystal = has_crystal, \
.initialized = false, \
}
#define MCP7940M_RTC_TBL_ENTRY(dev_name, mcp7940m_rtc_ctx) \
{ \
.sDeviceName = dev_name, \
.deviceType = RTC_CUSTOM, \
.pDeviceFns = &rtc_mcp7940m_fns, \
.deviceProbe = rtc_mcp7940m_probe, \
.pDeviceParams = (void *)mcp7940m_rtc_ctx, \
.ulCtrlPort1 = 0, \
.ulDataPort = 0, \
.getRegister = NULL, \
.setRegister = NULL, \
}
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* LIBCHIP_MCP7940M_RTC_H */
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