[PATCH] 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> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Alessandro Zummo
Linus Torvalds
parent
a95579cd4b
commit
edf1aaa31f
3 changed files with 244 additions and 0 deletions
|
|
@ -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
|
||||
|
|
|
|||
|
|
@ -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
|
||||
|
||||
|
|
|
|||
233
drivers/rtc/rtc-ds1672.c
Normal file
233
drivers/rtc/rtc-ds1672.c
Normal file
|
|
@ -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);
|
||||
Loading…
Reference in a new issue