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    Subject[PATCH 15/18] RTC subsystem, RS5C372 driver
    RTC class aware driver for the Ricoh RS5C372
    chip used, among others, on the Synology DS101.

    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-rs5c372.c | 294 ++++++++++++++++++++++++++++++++++++++++++++++
    3 files changed, 305 insertions(+)

    --- linux-rtc.orig/drivers/rtc/Kconfig 2006-03-13 03:28:43.000000000 +0100
    +++ linux-rtc/drivers/rtc/Kconfig 2006-03-13 03:28:53.000000000 +0100
    @@ -107,6 +107,16 @@ config RTC_DRV_PCF8563
    This driver can also be built as a module. If so, the module
    will be called rtc-pcf8563.

    +config RTC_DRV_RS5C372
    + tristate "Ricoh RS5C372A/B"
    + depends on RTC_CLASS && I2C
    + help
    + If you say yes here you get support for the
    + Ricoh RS5C372A and RS5C372B RTC chips.
    +
    + This driver can also be built as a module. If so, the module
    + will be called rtc-rs5c372.
    +
    config RTC_DRV_TEST
    tristate "Test driver/device"
    depends on RTC_CLASS
    --- linux-rtc.orig/drivers/rtc/Makefile 2006-03-13 03:28:43.000000000 +0100
    +++ linux-rtc/drivers/rtc/Makefile 2006-03-13 03:28:53.000000000 +0100
    @@ -15,4 +15,5 @@ obj-$(CONFIG_RTC_DRV_X1205) += rtc-x1205
    obj-$(CONFIG_RTC_DRV_TEST) += rtc-test.o
    obj-$(CONFIG_RTC_DRV_DS1672) += rtc-ds1672.o
    obj-$(CONFIG_RTC_DRV_PCF8563) += rtc-pcf8563.o
    +obj-$(CONFIG_RTC_DRV_RS5C372) += rtc-rs5c372.o

    --- /dev/null 1970-01-01 00:00:00.000000000 +0000
    +++ linux-rtc/drivers/rtc/rtc-rs5c372.c 2006-03-13 03:30:47.000000000 +0100
    @@ -0,0 +1,294 @@
    +/*
    + * An I2C driver for the Ricoh RS5C372 RTC
    + *
    + * Copyright (C) 2005 Pavel Mironchik <pmironchik@optifacio.net>
    + * Copyright (C) 2006 Tower Technologies
    + *
    + * 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/i2c.h>
    +#include <linux/rtc.h>
    +#include <linux/bcd.h>
    +
    +#define DRV_VERSION "0.2"
    +
    +/* Addresses to scan */
    +static unsigned short normal_i2c[] = { /* 0x32,*/ I2C_CLIENT_END };
    +
    +/* Insmod parameters */
    +I2C_CLIENT_INSMOD;
    +
    +#define RS5C372_REG_SECS 0
    +#define RS5C372_REG_MINS 1
    +#define RS5C372_REG_HOURS 2
    +#define RS5C372_REG_WDAY 3
    +#define RS5C372_REG_DAY 4
    +#define RS5C372_REG_MONTH 5
    +#define RS5C372_REG_YEAR 6
    +#define RS5C372_REG_TRIM 7
    +
    +#define RS5C372_TRIM_XSL 0x80
    +#define RS5C372_TRIM_MASK 0x7F
    +
    +#define RS5C372_REG_BASE 0
    +
    +static int rs5c372_attach(struct i2c_adapter *adapter);
    +static int rs5c372_detach(struct i2c_client *client);
    +static int rs5c372_probe(struct i2c_adapter *adapter, int address, int kind);
    +
    +static struct i2c_driver rs5c372_driver = {
    + .driver = {
    + .name = "rs5c372",
    + },
    + .attach_adapter = &rs5c372_attach,
    + .detach_client = &rs5c372_detach,
    +};
    +
    +static int rs5c372_get_datetime(struct i2c_client *client, struct rtc_time *tm)
    +{
    + unsigned char buf[7] = { RS5C372_REG_BASE };
    +
    + /* this implements the 1st reading method, according
    + * to the datasheet. buf[0] is initialized with
    + * address ptr and transmission format register.
    + */
    + struct i2c_msg msgs[] = {
    + { client->addr, 0, 1, buf },
    + { client->addr, I2C_M_RD, 7, buf },
    + };
    +
    + if ((i2c_transfer(client->adapter, msgs, 2)) != 2) {
    + dev_err(&client->dev, "%s: read error\n", __FUNCTION__);
    + return -EIO;
    + }
    +
    + tm->tm_sec = BCD2BIN(buf[RS5C372_REG_SECS] & 0x7f);
    + tm->tm_min = BCD2BIN(buf[RS5C372_REG_MINS] & 0x7f);
    + tm->tm_hour = BCD2BIN(buf[RS5C372_REG_HOURS] & 0x3f);
    + tm->tm_wday = BCD2BIN(buf[RS5C372_REG_WDAY] & 0x07);
    + tm->tm_mday = BCD2BIN(buf[RS5C372_REG_DAY] & 0x3f);
    +
    + /* tm->tm_mon is zero-based */
    + tm->tm_mon = BCD2BIN(buf[RS5C372_REG_MONTH] & 0x1f) - 1;
    +
    + /* year is 1900 + tm->tm_year */
    + tm->tm_year = BCD2BIN(buf[RS5C372_REG_YEAR]) + 100;
    +
    + 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 rs5c372_set_datetime(struct i2c_client *client, struct rtc_time *tm)
    +{
    + unsigned char buf[8] = { RS5C372_REG_BASE };
    +
    + 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);
    +
    + buf[1] = BIN2BCD(tm->tm_sec);
    + buf[2] = BIN2BCD(tm->tm_min);
    + buf[3] = BIN2BCD(tm->tm_hour);
    + buf[4] = BIN2BCD(tm->tm_wday);
    + buf[5] = BIN2BCD(tm->tm_mday);
    + buf[6] = BIN2BCD(tm->tm_mon + 1);
    + buf[7] = BIN2BCD(tm->tm_year - 100);
    +
    + if ((i2c_master_send(client, buf, 8)) != 8) {
    + dev_err(&client->dev, "%s: write error\n", __FUNCTION__);
    + return -EIO;
    + }
    +
    + return 0;
    +}
    +
    +static int rs5c372_get_trim(struct i2c_client *client, int *osc, int *trim)
    +{
    + unsigned char buf = RS5C372_REG_TRIM;
    +
    + struct i2c_msg msgs[] = {
    + { client->addr, 0, 1, &buf },
    + { client->addr, I2C_M_RD, 1, &buf },
    + };
    +
    + if ((i2c_transfer(client->adapter, msgs, 2)) != 2) {
    + dev_err(&client->dev, "%s: read error\n", __FUNCTION__);
    + return -EIO;
    + }
    +
    + dev_dbg(&client->dev, "%s: raw trim=%x\n", __FUNCTION__, trim);
    +
    + if (osc)
    + *osc = (buf & RS5C372_TRIM_XSL) ? 32000 : 32768;
    +
    + if (trim)
    + *trim = buf & RS5C372_TRIM_MASK;
    +
    + return 0;
    +}
    +
    +static int rs5c372_rtc_read_time(struct device *dev, struct rtc_time *tm)
    +{
    + return rs5c372_get_datetime(to_i2c_client(dev), tm);
    +}
    +
    +static int rs5c372_rtc_set_time(struct device *dev, struct rtc_time *tm)
    +{
    + return rs5c372_set_datetime(to_i2c_client(dev), tm);
    +}
    +
    +static int rs5c372_rtc_proc(struct device *dev, struct seq_file *seq)
    +{
    + int err, osc, trim;
    +
    + seq_printf(seq, "24hr\t\t: yes\n");
    +
    + if ((err = rs5c372_get_trim(to_i2c_client(dev), &osc, &trim)) == 0) {
    + seq_printf(seq, "%d.%03d KHz\n", osc / 1000, osc % 1000);
    + seq_printf(seq, "trim\t: %d\n", trim);
    + }
    +
    + return 0;
    +}
    +
    +static struct rtc_class_ops rs5c372_rtc_ops = {
    + .proc = rs5c372_rtc_proc,
    + .read_time = rs5c372_rtc_read_time,
    + .set_time = rs5c372_rtc_set_time,
    +};
    +
    +static ssize_t rs5c372_sysfs_show_trim(struct device *dev,
    + struct device_attribute *attr, char *buf)
    +{
    + int trim;
    +
    + if (rs5c372_get_trim(to_i2c_client(dev), NULL, &trim) == 0)
    + return sprintf(buf, "0x%2x\n", trim);
    +
    + return 0;
    +}
    +static DEVICE_ATTR(trim, S_IRUGO, rs5c372_sysfs_show_trim, NULL);
    +
    +static ssize_t rs5c372_sysfs_show_osc(struct device *dev,
    + struct device_attribute *attr, char *buf)
    +{
    + int osc;
    +
    + if (rs5c372_get_trim(to_i2c_client(dev), &osc, NULL) == 0)
    + return sprintf(buf, "%d.%03d KHz\n", osc / 1000, osc % 1000);
    +
    + return 0;
    +}
    +static DEVICE_ATTR(osc, S_IRUGO, rs5c372_sysfs_show_osc, NULL);
    +
    +static int rs5c372_attach(struct i2c_adapter *adapter)
    +{
    + dev_dbg(&adapter->dev, "%s\n", __FUNCTION__);
    + return i2c_probe(adapter, &addr_data, rs5c372_probe);
    +}
    +
    +static int rs5c372_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 = &rs5c372_driver;
    + client->adapter = adapter;
    +
    + strlcpy(client->name, rs5c372_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(rs5c372_driver.driver.name, &client->dev,
    + &rs5c372_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);
    +
    + device_create_file(&client->dev, &dev_attr_trim);
    + device_create_file(&client->dev, &dev_attr_osc);
    +
    + return 0;
    +
    +exit_detach:
    + i2c_detach_client(client);
    +
    +exit_kfree:
    + kfree(client);
    +
    +exit:
    + return err;
    +}
    +
    +static int rs5c372_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 __init int rs5c372_init(void)
    +{
    + return i2c_add_driver(&rs5c372_driver);
    +}
    +
    +static __exit void rs5c372_exit(void)
    +{
    + i2c_del_driver(&rs5c372_driver);
    +}
    +
    +module_init(rs5c372_init);
    +module_exit(rs5c372_exit);
    +
    +MODULE_AUTHOR(
    + "Pavel Mironchik <pmironchik@optifacio.net>, "
    + "Alessandro Zummo <a.zummo@towertech.it>");
    +MODULE_DESCRIPTION("Ricoh RS5C372 RTC driver");
    +MODULE_LICENSE("GPL");
    +MODULE_VERSION(DRV_VERSION);
    --
    -
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