diff options
Diffstat (limited to 'drivers/rtc/rtc-ds3234.c')
| -rw-r--r-- | drivers/rtc/rtc-ds3234.c | 171 |
1 files changed, 0 insertions, 171 deletions
diff --git a/drivers/rtc/rtc-ds3234.c b/drivers/rtc/rtc-ds3234.c deleted file mode 100644 index 570ab28fc..000000000 --- a/drivers/rtc/rtc-ds3234.c +++ /dev/null @@ -1,171 +0,0 @@ -/* rtc-ds3234.c - * - * Driver for Dallas Semiconductor (DS3234) SPI RTC with Integrated Crystal - * and SRAM. - * - * Copyright (C) 2008 MIMOMax Wireless Ltd. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - * - */ - -#include <linux/init.h> -#include <linux/module.h> -#include <linux/device.h> -#include <linux/platform_device.h> -#include <linux/rtc.h> -#include <linux/spi/spi.h> -#include <linux/bcd.h> - -#define DS3234_REG_SECONDS 0x00 -#define DS3234_REG_MINUTES 0x01 -#define DS3234_REG_HOURS 0x02 -#define DS3234_REG_DAY 0x03 -#define DS3234_REG_DATE 0x04 -#define DS3234_REG_MONTH 0x05 -#define DS3234_REG_YEAR 0x06 -#define DS3234_REG_CENTURY (1 << 7) /* Bit 7 of the Month register */ - -#define DS3234_REG_CONTROL 0x0E -#define DS3234_REG_CONT_STAT 0x0F - -static int ds3234_set_reg(struct device *dev, unsigned char address, - unsigned char data) -{ - struct spi_device *spi = to_spi_device(dev); - unsigned char buf[2]; - - /* MSB must be '1' to indicate write */ - buf[0] = address | 0x80; - buf[1] = data; - - return spi_write_then_read(spi, buf, 2, NULL, 0); -} - -static int ds3234_get_reg(struct device *dev, unsigned char address, - unsigned char *data) -{ - struct spi_device *spi = to_spi_device(dev); - - *data = address & 0x7f; - - return spi_write_then_read(spi, data, 1, data, 1); -} - -static int ds3234_read_time(struct device *dev, struct rtc_time *dt) -{ - int err; - unsigned char buf[8]; - struct spi_device *spi = to_spi_device(dev); - - buf[0] = 0x00; /* Start address */ - - err = spi_write_then_read(spi, buf, 1, buf, 8); - if (err != 0) - return err; - - /* Seconds, Minutes, Hours, Day, Date, Month, Year */ - dt->tm_sec = bcd2bin(buf[0]); - dt->tm_min = bcd2bin(buf[1]); - dt->tm_hour = bcd2bin(buf[2] & 0x3f); - dt->tm_wday = bcd2bin(buf[3]) - 1; /* 0 = Sun */ - dt->tm_mday = bcd2bin(buf[4]); - dt->tm_mon = bcd2bin(buf[5] & 0x1f) - 1; /* 0 = Jan */ - dt->tm_year = bcd2bin(buf[6] & 0xff) + 100; /* Assume 20YY */ - - return rtc_valid_tm(dt); -} - -static int ds3234_set_time(struct device *dev, struct rtc_time *dt) -{ - ds3234_set_reg(dev, DS3234_REG_SECONDS, bin2bcd(dt->tm_sec)); - ds3234_set_reg(dev, DS3234_REG_MINUTES, bin2bcd(dt->tm_min)); - ds3234_set_reg(dev, DS3234_REG_HOURS, bin2bcd(dt->tm_hour) & 0x3f); - - /* 0 = Sun */ - ds3234_set_reg(dev, DS3234_REG_DAY, bin2bcd(dt->tm_wday + 1)); - ds3234_set_reg(dev, DS3234_REG_DATE, bin2bcd(dt->tm_mday)); - - /* 0 = Jan */ - ds3234_set_reg(dev, DS3234_REG_MONTH, bin2bcd(dt->tm_mon + 1)); - - /* Assume 20YY although we just want to make sure not to go negative. */ - if (dt->tm_year > 100) - dt->tm_year -= 100; - - ds3234_set_reg(dev, DS3234_REG_YEAR, bin2bcd(dt->tm_year)); - - return 0; -} - -static const struct rtc_class_ops ds3234_rtc_ops = { - .read_time = ds3234_read_time, - .set_time = ds3234_set_time, -}; - -static int ds3234_probe(struct spi_device *spi) -{ - struct rtc_device *rtc; - unsigned char tmp; - int res; - - spi->mode = SPI_MODE_3; - spi->bits_per_word = 8; - spi_setup(spi); - - res = ds3234_get_reg(&spi->dev, DS3234_REG_SECONDS, &tmp); - if (res != 0) - return res; - - /* Control settings - * - * CONTROL_REG - * BIT 7 6 5 4 3 2 1 0 - * EOSC BBSQW CONV RS2 RS1 INTCN A2IE A1IE - * - * 0 0 0 1 1 1 0 0 - * - * CONTROL_STAT_REG - * BIT 7 6 5 4 3 2 1 0 - * OSF BB32kHz CRATE1 CRATE0 EN32kHz BSY A2F A1F - * - * 1 0 0 0 1 0 0 0 - */ - ds3234_get_reg(&spi->dev, DS3234_REG_CONTROL, &tmp); - ds3234_set_reg(&spi->dev, DS3234_REG_CONTROL, tmp & 0x1c); - - ds3234_get_reg(&spi->dev, DS3234_REG_CONT_STAT, &tmp); - ds3234_set_reg(&spi->dev, DS3234_REG_CONT_STAT, tmp & 0x88); - - /* Print our settings */ - ds3234_get_reg(&spi->dev, DS3234_REG_CONTROL, &tmp); - dev_info(&spi->dev, "Control Reg: 0x%02x\n", tmp); - - ds3234_get_reg(&spi->dev, DS3234_REG_CONT_STAT, &tmp); - dev_info(&spi->dev, "Ctrl/Stat Reg: 0x%02x\n", tmp); - - rtc = devm_rtc_device_register(&spi->dev, "ds3234", - &ds3234_rtc_ops, THIS_MODULE); - if (IS_ERR(rtc)) - return PTR_ERR(rtc); - - spi_set_drvdata(spi, rtc); - - return 0; -} - -static struct spi_driver ds3234_driver = { - .driver = { - .name = "ds3234", - }, - .probe = ds3234_probe, -}; - -module_spi_driver(ds3234_driver); - -MODULE_DESCRIPTION("DS3234 SPI RTC driver"); -MODULE_AUTHOR("Dennis Aberilla <denzzzhome@yahoo.com>"); -MODULE_LICENSE("GPL"); -MODULE_ALIAS("spi:ds3234"); |