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path: root/drivers/rtc/rtc-ds3234.c
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Diffstat (limited to 'drivers/rtc/rtc-ds3234.c')
-rw-r--r--drivers/rtc/rtc-ds3234.c171
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");