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    Subject[PATCH 13/18] RTC subsystem, DS1672 driver
    Driver for the Dallas/Maxim DS1672 chip, found
    on the Loft (http://www.giantshoulderinc.com) .


    Signed-off-by: Alessandro Zummo <a.zummo@towertech.it>
    Signed-off-by: Andrew Morton <akpm@osdl.org>
    --
    drivers/rtc/Kconfig | 10 ++
    drivers/rtc/Makefile | 1
    drivers/rtc/rtc-ds1672.c | 233 +++++++++++++++++++++++++++++++++++++++++++++++
    3 files changed, 244 insertions(+)

    --- linux-rtc.orig/drivers/rtc/Kconfig 2006-03-15 03:12:58.000000000 +0100
    +++ linux-rtc/drivers/rtc/Kconfig 2006-03-15 03:12:59.000000000 +0100
    @@ -86,6 +86,16 @@ 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_DS1672
    + tristate "Dallas/Maxim DS1672"
    + depends on RTC_CLASS && I2C
    + help
    + If you say yes here you get support for the
    + Dallas/Maxim DS1672 timekeeping chip.
    +
    + This driver can also be built as a module. If so, the module
    + will be called rtc-ds1672.
    +
    config RTC_DRV_TEST
    tristate "Test driver/device"
    depends on RTC_CLASS
    --- linux-rtc.orig/drivers/rtc/Makefile 2006-03-15 03:12:58.000000000 +0100
    +++ linux-rtc/drivers/rtc/Makefile 2006-03-15 03:12:59.000000000 +0100
    @@ -13,4 +13,5 @@ obj-$(CONFIG_RTC_INTF_DEV) += rtc-dev.o

    obj-$(CONFIG_RTC_DRV_X1205) += rtc-x1205.o
    obj-$(CONFIG_RTC_DRV_TEST) += rtc-test.o
    +obj-$(CONFIG_RTC_DRV_DS1672) += rtc-ds1672.o

    --- /dev/null 1970-01-01 00:00:00.000000000 +0000
    +++ linux-rtc/drivers/rtc/rtc-ds1672.c 2006-03-15 03:13:54.000000000 +0100
    @@ -0,0 +1,233 @@
    +/*
    + * An rtc/i2c driver for the Dallas DS1672
    + * Copyright 2005 Alessandro Zummo
    + *
    + * 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/module.h>
    +#include <linux/i2c.h>
    +#include <linux/rtc.h>
    +
    +#define DRV_VERSION "0.2"
    +
    +/* Addresses to scan: none. This chip cannot be detected. */
    +static unsigned short normal_i2c[] = { I2C_CLIENT_END };
    +
    +/* Insmod parameters */
    +I2C_CLIENT_INSMOD;
    +
    +/* Registers */
    +
    +#define DS1672_REG_CNT_BASE 0
    +#define DS1672_REG_CONTROL 4
    +#define DS1672_REG_TRICKLE 5
    +
    +
    +/* Prototypes */
    +static int ds1672_probe(struct i2c_adapter *adapter, int address, int kind);
    +
    +/*
    + * In the routines that deal directly with the ds1672 hardware, we use
    + * rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch
    + * Epoch is initialized as 2000. Time is set to UTC.
    + */
    +static int ds1672_get_datetime(struct i2c_client *client, struct rtc_time *tm)
    +{
    + unsigned long time;
    + unsigned char addr = DS1672_REG_CNT_BASE;
    + unsigned char buf[4];
    +
    + struct i2c_msg msgs[] = {
    + { client->addr, 0, 1, &addr }, /* setup read ptr */
    + { client->addr, I2C_M_RD, 4, buf }, /* read date */
    + };
    +
    + /* read date registers */
    + if ((i2c_transfer(client->adapter, &msgs[0], 2)) != 2) {
    + dev_err(&client->dev, "%s: read error\n", __FUNCTION__);
    + return -EIO;
    + }
    +
    + dev_dbg(&client->dev,
    + "%s: raw read data - counters=%02x,%02x,%02x,%02x\n"
    + __FUNCTION__,
    + buf[0], buf[1], buf[2], buf[3]);
    +
    + time = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
    +
    + rtc_time_to_tm(time, tm);
    +
    + dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
    + "mday=%d, mon=%d, year=%d, wday=%d\n",
    + __FUNCTION__,
    + tm->tm_sec, tm->tm_min, tm->tm_hour,
    + tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
    +
    + return 0;
    +}
    +
    +static int ds1672_set_mmss(struct i2c_client *client, unsigned long secs)
    +{
    + int xfer;
    + unsigned char buf[5];
    +
    + buf[0] = DS1672_REG_CNT_BASE;
    + buf[1] = secs & 0x000000FF;
    + buf[2] = (secs & 0x0000FF00) >> 8;
    + buf[3] = (secs & 0x00FF0000) >> 16;
    + buf[4] = (secs & 0xFF000000) >> 24;
    +
    + xfer = i2c_master_send(client, buf, 5);
    + if (xfer != 5) {
    + dev_err(&client->dev, "%s: send: %d\n", __FUNCTION__, xfer);
    + return -EIO;
    + }
    +
    + return 0;
    +}
    +
    +static int ds1672_set_datetime(struct i2c_client *client, struct rtc_time *tm)
    +{
    + unsigned long secs;
    +
    + dev_dbg(&client->dev,
    + "%s: secs=%d, mins=%d, hours=%d, ",
    + "mday=%d, mon=%d, year=%d, wday=%d\n",
    + __FUNCTION__,
    + tm->tm_sec, tm->tm_min, tm->tm_hour,
    + tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
    +
    + rtc_tm_to_time(tm, &secs);
    +
    + return ds1672_set_mmss(client, secs);
    +}
    +
    +static int ds1672_rtc_read_time(struct device *dev, struct rtc_time *tm)
    +{
    + return ds1672_get_datetime(to_i2c_client(dev), tm);
    +}
    +
    +static int ds1672_rtc_set_time(struct device *dev, struct rtc_time *tm)
    +{
    + return ds1672_set_datetime(to_i2c_client(dev), tm);
    +}
    +
    +static int ds1672_rtc_set_mmss(struct device *dev, unsigned long secs)
    +{
    + return ds1672_set_mmss(to_i2c_client(dev), secs);
    +}
    +
    +static struct rtc_class_ops ds1672_rtc_ops = {
    + .read_time = ds1672_rtc_read_time,
    + .set_time = ds1672_rtc_set_time,
    + .set_mmss = ds1672_rtc_set_mmss,
    +};
    +
    +static int ds1672_attach(struct i2c_adapter *adapter)
    +{
    + dev_dbg(&adapter->dev, "%s\n", __FUNCTION__);
    + return i2c_probe(adapter, &addr_data, ds1672_probe);
    +}
    +
    +static int ds1672_detach(struct i2c_client *client)
    +{
    + int err;
    + struct rtc_device *rtc = i2c_get_clientdata(client);
    +
    + dev_dbg(&client->dev, "%s\n", __FUNCTION__);
    +
    + if (rtc)
    + rtc_device_unregister(rtc);
    +
    + if ((err = i2c_detach_client(client)))
    + return err;
    +
    + kfree(client);
    +
    + return 0;
    +}
    +
    +static struct i2c_driver ds1672_driver = {
    + .driver = {
    + .name = "ds1672",
    + },
    + .id = I2C_DRIVERID_DS1672,
    + .attach_adapter = &ds1672_attach,
    + .detach_client = &ds1672_detach,
    +};
    +
    +static int ds1672_probe(struct i2c_adapter *adapter, int address, int kind)
    +{
    + int err = 0;
    + struct i2c_client *client;
    + struct rtc_device *rtc;
    +
    + dev_dbg(&adapter->dev, "%s\n", __FUNCTION__);
    +
    + if (!i2c_check_functionality(adapter, I2C_FUNC_I2C)) {
    + err = -ENODEV;
    + goto exit;
    + }
    +
    + if (!(client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL))) {
    + err = -ENOMEM;
    + goto exit;
    + }
    +
    + /* I2C client */
    + client->addr = address;
    + client->driver = &ds1672_driver;
    + client->adapter = adapter;
    +
    + strlcpy(client->name, ds1672_driver.driver.name, I2C_NAME_SIZE);
    +
    + /* Inform the i2c layer */
    + if ((err = i2c_attach_client(client)))
    + goto exit_kfree;
    +
    + dev_info(&client->dev, "chip found, driver version " DRV_VERSION "\n");
    +
    + rtc = rtc_device_register(ds1672_driver.driver.name, &client->dev,
    + &ds1672_rtc_ops, THIS_MODULE);
    +
    + if (IS_ERR(rtc)) {
    + err = PTR_ERR(rtc);
    + dev_err(&client->dev,
    + "unable to register the class device\n");
    + goto exit_detach;
    + }
    +
    + i2c_set_clientdata(client, rtc);
    +
    + return 0;
    +
    +exit_detach:
    + i2c_detach_client(client);
    +
    +exit_kfree:
    + kfree(client);
    +
    +exit:
    + return err;
    +}
    +
    +static int __init ds1672_init(void)
    +{
    + return i2c_add_driver(&ds1672_driver);
    +}
    +
    +static void __exit ds1672_exit(void)
    +{
    + i2c_del_driver(&ds1672_driver);
    +}
    +
    +MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
    +MODULE_DESCRIPTION("Dallas/Maxim DS1672 timekeeper driver");
    +MODULE_LICENSE("GPL");
    +MODULE_VERSION(DRV_VERSION);
    +
    +module_init(ds1672_init);
    +module_exit(ds1672_exit);
    --
    -
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