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[PATCH 3/4] RTC: add Xicor 1241 driver

To: i2c@lm-sensors.org, linux-mips@linux-mips.org, rtc-linux@googlegroups.com
Subject: [PATCH 3/4] RTC: add Xicor 1241 driver
From: Mark Zhan <rongkai.zhan@windriver.com>
Date: Sun, 30 Sep 2007 17:55:05 +0800
Cc: ralf@linux-mips.org, a.zummo@towertech.it, rongkai.zhan@windriver.com
Original-recipient: rfc822;linux-mips@linux-mips.org
Sender: linux-mips-bounce@linux-mips.org
User-agent: Thunderbird 1.5.0.13 (X11/20070824)
This patch add the Xicor 1241 RTC driver which is used in
MIPS Sibyte 1250/1480 boards.

Signed-off-by: Mark Zhan <rongkai.zhan@windriver.com>
---
 drivers/rtc/Kconfig         |   10 ++
 drivers/rtc/Makefile        |    2
 drivers/rtc/rtc-xicor1241.c |  184 ++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 196 insertions(+)

--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -184,6 +184,16 @@ config RTC_DRV_X1205
          This driver can also be built as a module. If so, the module
          will be called rtc-x1205.

+config RTC_DRV_XICOR1241
+       tristate "Xicor 1241"
+       depends on RTC_CLASS && I2C && MIPS
+       help
+         If you say yes here you get support for the
+         Xicor 1241 RTC chip.
+
+         This driver can also be built as a module. If so, the module
+         will be called rtc-xicor1241.
+
 config RTC_DRV_PCF8563
        tristate "Philips PCF8563/Epson RTC8564"
        help
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -48,3 +48,5 @@ obj-$(CONFIG_RTC_DRV_TEST)    += rtc-test.o
 obj-$(CONFIG_RTC_DRV_V3020)    += rtc-v3020.o
 obj-$(CONFIG_RTC_DRV_VR41XX)   += rtc-vr41xx.o
 obj-$(CONFIG_RTC_DRV_X1205)    += rtc-x1205.o
+obj-$(CONFIG_RTC_DRV_XICOR1241)        += rtc-xicor1241.o
+
--- /dev/null
+++ b/drivers/rtc/rtc-xicor1241.c
@@ -0,0 +1,184 @@
+/*
+ * Xicor 1241 RTC driver
+ *
+ * Copyright (c) 2007 Wind River Systems, Inc.
+ *
+ * Author: Mark Zhan <rongkai.zhan@windriver.com>
+ *
+ * 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/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/bcd.h>
+#include <linux/rtc.h>
+#include <linux/i2c.h>
+
+/*
+ * Register bits
+ */
+#define X1241_SR_BAT   0x80            /* currently on battery power */
+#define X1241_SR_RWEL  0x04            /* r/w latch is enabled, can write RTC 
*/
+#define X1241_SR_WEL   0x02            /* r/w latch is unlocked, can enable 
r/w now */
+#define X1241_SR_RTCF  0x01            /* clock failed */
+#define X1241_HR_MIL   0x80            /* 24 hours format */
+
+/*
+ * Register Offset
+ */
+#define X1241_SEC      0x30            /* Seconds */
+#define X1241_MIN      0x31            /* Minutes */
+#define X1241_HOUR     0x32            /* Hours */
+#define X1241_MDAY     0x33            /* Day of month */
+#define X1241_MON      0x34            /* Month */
+#define X1241_YEAR     0x35            /* Year */
+#define X1241_WDAY     0x36            /* Day of Week */
+#define X1241_Y2K      0x37            /* Year 2K */
+#define X1241_SR       0x3F            /* Status register */
+
+DEFINE_SPINLOCK(xicor1241_lock);
+
+static int xicor1241_get_time(struct device *dev, struct rtc_time *tm)
+{
+       struct i2c_client *client = to_i2c_client(dev);
+       unsigned int y2k, year, mon, mday, wday, hour, min, sec;
+       unsigned long flags;
+
+       spin_lock_irqsave(&xicor1241_lock, flags);
+
+       i2c_smbus_write_byte_data(client, X1241_SEC, X1241_SEC);
+       sec = i2c_smbus_read_byte_data(client, X1241_SEC);
+       min = i2c_smbus_read_byte_data(client, X1241_MIN);
+       hour = i2c_smbus_read_byte_data(client, X1241_HOUR);
+       mday = i2c_smbus_read_byte_data(client, X1241_MDAY);
+       mon = i2c_smbus_read_byte_data(client, X1241_MON);
+       year = i2c_smbus_read_byte_data(client, X1241_YEAR);
+       wday = i2c_smbus_read_byte_data(client, X1241_WDAY);
+       y2k = i2c_smbus_read_byte_data(client, X1241_Y2K);
+
+       spin_unlock_irqrestore(&xicor1241_lock, flags);
+
+       dev_dbg(dev, "X1241 read reg: y2k=%02x,year=%02x,mon=%02x,"
+               "mday=%02x,wday=%02x,hour=%02x,min=%02x,sec=%02x\n",
+               y2k, year, mon, mday, wday, hour, min, sec);
+
+       tm->tm_sec = BCD2BIN(sec);
+       tm->tm_min = BCD2BIN(min);
+       tm->tm_hour = BCD2BIN(hour & 0x3F); /* hr is 0-23 */
+       tm->tm_mday = BCD2BIN(mday);
+       tm->tm_wday = BCD2BIN(wday);
+       tm->tm_mon = BCD2BIN(mon) - 1; /* tm_mon is 0-11 */
+       tm->tm_year = BCD2BIN(year);
+       tm->tm_year += (BCD2BIN(y2k) * 100) - 1900;
+
+       dev_dbg(dev, "RTC read time %04d-%02d-%02d %02d:%02d:%02d, y2k=%02d\n",
+               tm->tm_year + 1900, tm->tm_mon+1, tm->tm_mday,
+               tm->tm_hour, tm->tm_min, tm->tm_sec, y2k);
+       return 0;
+}
+
+static int xicor1241_set_time(struct device *dev, struct rtc_time *tm)
+{
+       struct i2c_client *client = to_i2c_client(dev);
+       unsigned int y2k, year, mon, mday, wday, hour, min, sec;
+       unsigned long flags;
+
+       dev_dbg(dev, "RTC set time %04d-%02d-%02d %02d:%02d:%02d\n",
+               tm->tm_year + 1900, tm->tm_mon+1, tm->tm_mday,
+               tm->tm_hour, tm->tm_min, tm->tm_sec);
+
+       sec = BIN2BCD(tm->tm_sec);
+       min = BIN2BCD(tm->tm_min);
+       hour = BIN2BCD(tm->tm_hour) | X1241_HR_MIL; /* 24 hours format */
+       mday = BIN2BCD(tm->tm_mday);
+       wday = BIN2BCD(tm->tm_wday);
+       mon = BIN2BCD(tm->tm_mon + 1); /* tm_mon is 0-11 */
+       year = BIN2BCD(tm->tm_year % 100);
+       y2k = BIN2BCD((tm->tm_year / 100) + 19);
+
+       dev_dbg(dev, "X1241 write reg: y2k=%02x,year=%02x,mon=%02x,"
+               "mday=%02x,wday=%02x,hour=%02x,min=%02x,sec=%02x\n",
+               y2k, year, mon, mday, wday, hour, min, sec);
+
+       spin_lock_irqsave(&xicor1241_lock, flags);
+
+       /* unlock writes to the CCR */
+       i2c_smbus_write_word_data(client, X1241_SR,
+                       (X1241_SR_WEL << 8) | X1241_SR);
+       i2c_smbus_write_word_data(client, X1241_SR,
+                       ((X1241_SR_WEL | X1241_SR_RWEL) << 8) | X1241_SR);
+
+       i2c_smbus_write_word_data(client, X1241_SEC, (sec << 8) | X1241_SEC);
+       i2c_smbus_write_word_data(client, X1241_MIN, (min << 8) | X1241_MIN);
+       i2c_smbus_write_word_data(client, X1241_HOUR, (hour << 8) | X1241_HOUR);
+       i2c_smbus_write_word_data(client, X1241_MDAY, (mday << 8) | X1241_MDAY);
+       i2c_smbus_write_word_data(client, X1241_WDAY, (wday << 8) | X1241_WDAY);
+       i2c_smbus_write_word_data(client, X1241_MON, (mon << 8) | X1241_MON);
+       i2c_smbus_write_word_data(client, X1241_YEAR, (year << 8) | X1241_YEAR);
+       i2c_smbus_write_word_data(client, X1241_Y2K, (y2k << 8) | X1241_Y2K);
+
+       i2c_smbus_write_word_data(client, X1241_SR, (0 << 8) | X1241_SR);
+
+       spin_unlock_irqrestore(&xicor1241_lock, flags);
+       return 0;
+}
+
+static const struct rtc_class_ops xicor1241_rtc_ops = {
+       .read_time = xicor1241_get_time,
+       .set_time  = xicor1241_set_time,
+};
+
+static int __devinit xicor1241_rtc_probe(struct i2c_client *client)
+{
+       struct rtc_device *rtc;
+
+       if (!i2c_check_functionality(client->adapter, 
I2C_FUNC_SMBUS_BYTE_DATA)) {
+               dev_dbg(&client->dev, "I2C adapter function check failure!\n");
+               return -ENODEV;
+       }
+
+       rtc = rtc_device_register(client->name, &client->dev,
+                                 &xicor1241_rtc_ops, THIS_MODULE);
+       if (IS_ERR(rtc))
+               return PTR_ERR(rtc);
+
+       i2c_set_clientdata(client, rtc);
+       return 0;
+}
+
+static int __devexit xicor1241_rtc_remove(struct i2c_client *client)
+{
+       struct rtc_device *rtc = i2c_get_clientdata(client);
+
+       rtc_device_unregister(rtc);
+       return 0;
+}
+
+static struct i2c_driver xicor1241_i2c_driver = {
+       .driver         = {
+               .name   = "rtc-xicor1241",
+               .owner  = THIS_MODULE,
+       },
+       .probe          = xicor1241_rtc_probe,
+       .remove         = __devexit_p(xicor1241_rtc_remove),
+};
+
+static int __init xicor1241_rtc_init(void)
+{
+       return i2c_add_driver(&xicor1241_i2c_driver);
+}
+
+static void __exit xicor1241_rtc_exit(void)
+{
+       i2c_del_driver(&xicor1241_i2c_driver);
+}
+
+module_init(xicor1241_rtc_init);
+module_exit(xicor1241_rtc_exit);
+
+MODULE_AUTHOR("Mark Zhan <rongkai.zhan@windriver.com>");
+MODULE_DESCRIPTION("Xicor1241 RTC driver");
+MODULE_LICENSE("GPL");

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