Shared_tod_i2c_rtc

Generic I2C RTC driver. More...

Modules
	Shared_tod_abeoz9_rtc
	RTC driver for the Abracon EOZ9 series.
	Shared_tod_mcp7940m_rtc
	RTC driver for the MCP7940M.

Files
file	i2c-rtc.h
	This file provides the interfaces of Shared_tod_i2c_rtc.
file	i2c-rtc.c
	This file provides the implementation of Shared_tod_i2c_rtc.

Data Structures
struct	i2c_rtc_base

Macros
#define	I2C_RTC_ORDER_sec_min_hour_wkday_day_month_year    { .sec = 0, .min = 1, .hour = 2, .day = 4, .wkday = 3, .month = 5, .year = 6 }
#define	I2C_RTC_ORDER_sec_min_hour_day_wkday_month_year    { .sec = 0, .min = 1, .hour = 2, .day = 3, .wkday = 4, .month = 5, .year = 6 }
#define	I2C_RTC_INITIALIZER(i2c_path, i2c_address, offset, reg_order, driver_name, hwinit)
#define	I2C_RTC_TBL_ENTRY(dev_name, i2c_rtc_ctx)

Functions
bool	i2c_rtc_probe (int minor)
int	i2c_rtc_read (struct i2c_rtc_base *ctx, uint8_t addr, uint8_t *buf, size_t len)
int	i2c_rtc_write (struct i2c_rtc_base *ctx, uint8_t addr, const uint8_t *buf, size_t len)

Variables
const rtc_fns	i2c_rtc_fns

Detailed Description

Generic I2C RTC driver.

Base functionality for I2C based RTC drivers. An additional, chip specific initialization is necessary.

Expects a register block with the following time format:

• <base>+off.second:
  • Bit 0 to 6: Seconds (BCD encoded)
  • Bit 7: Don't care
• <base>+off.minute:
  • Bit 0 to 6: Minutes (BCD encoded)
  • Bit 7: Don't care
• <base>+off.hour:
  • Bit 0 to 5: Hours (BCD encoded); Bit 5 indicates AM (0) and PM (1) in 12 hour mode
  • Bit 6: 0 for 24 hour mode; 1 for 12 hour mode
• <base>+off.wkday:
  • Bit 0 to 2: Day of Week
  • Bit 3 to 7: Don't care
• <base>+off.day:
  • Bit 0 to 5: Day (BCD encoded)
  • Bit 6 and 7: Don't care
• <base>+off.month:
  • Bit 0 to 4: Month (BCD encoded)
  • Bit 5 to 7: Don't care
• <base>+off.year:
  • Bit 0 to 6: Year (BCD encoded)
  • Bit 7: Don't care

See abeoz9 or mcp7940m for how to use this base driver.

Macro Definition Documentation

I2C_RTC_INITIALIZER

#define I2C_RTC_INITIALIZER	(		i2c_path,
			i2c_address,
			offset,
			reg_order,
			driver_name,
			hwinit
	)

Value:

  { \
    .mutex = RTEMS_MUTEX_INITIALIZER(driver_name), \
    .i2c_bus_path = i2c_path, \
    .i2c_addr = i2c_address, \
    .initialized = false, \
    .hw_init = hwinit, \
    .clock_offset = offset, \
    .order = reg_order, \
  }

I2C_RTC_TBL_ENTRY

#define I2C_RTC_TBL_ENTRY	(		dev_name,
			i2c_rtc_ctx
	)

Value:

  { \
    .sDeviceName = dev_name, \
    .deviceType = RTC_CUSTOM, \
    .pDeviceFns = &i2c_rtc_fns, \
    .deviceProbe = i2c_rtc_probe, \
    .pDeviceParams = (void *)i2c_rtc_ctx, \
    .ulCtrlPort1 = 0, \
    .ulDataPort = 0, \
    .getRegister = NULL, \
    .setRegister = NULL, \
  }

Function Documentation

i2c_rtc_read()

int i2c_rtc_read	(	struct i2c_rtc_base *	ctx,
		uint8_t	addr,
		uint8_t *	buf,
		size_t	len
	)

Read bytes from the I2C RTC. Can be used in derived drivers.

Returns 0 on success or anything else on error.

i2c_rtc_write()

int i2c_rtc_write	(	struct i2c_rtc_base *	ctx,
		uint8_t	addr,
		const uint8_t *	buf,
		size_t	len
	)

Write bytes to the I2C RTC. Can be used in derived drivers.

Returns 0 on success or anything else on error.