/*
* An rtc/i2c driver for the Dallas DS1672
- * Copyright 2005 Alessandro Zummo
+ * Copyright 2005-06 Tower Technologies
+ *
+ * Author: Alessandro Zummo <a.zummo@towertech.it>
*
* 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;
+#define DRV_VERSION "0.4"
/* Registers */
#define DS1672_REG_CONTROL 4
#define DS1672_REG_TRICKLE 5
+#define DS1672_REG_CONTROL_EOSC 0x80
-/* Prototypes */
-static int ds1672_probe(struct i2c_adapter *adapter, int address, int kind);
+static struct i2c_driver ds1672_driver;
/*
* In the routines that deal directly with the ds1672 hardware, we use
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 */
+ {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__);
+ dev_err(&client->dev, "%s: read error\n", __func__);
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]);
+ "%s: raw read data - counters=%02x,%02x,%02x,%02x\n",
+ __func__, buf[0], buf[1], buf[2], buf[3]);
time = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
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,
+ __func__, 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];
+ unsigned char buf[6];
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;
+ buf[5] = 0; /* set control reg to enable counting */
- xfer = i2c_master_send(client, buf, 5);
- if (xfer != 5) {
- dev_err(&client->dev, "%s: send: %d\n", __FUNCTION__, xfer);
+ xfer = i2c_master_send(client, buf, 6);
+ if (xfer != 6) {
+ dev_err(&client->dev, "%s: send: %d\n", __func__, 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)
+static int ds1672_get_control(struct i2c_client *client, u8 *status)
{
- dev_dbg(&adapter->dev, "%s\n", __FUNCTION__);
- return i2c_probe(adapter, &addr_data, ds1672_probe);
+ unsigned char addr = DS1672_REG_CONTROL;
+
+ struct i2c_msg msgs[] = {
+ {client->addr, 0, 1, &addr}, /* setup read ptr */
+ {client->addr, I2C_M_RD, 1, status}, /* read control */
+ };
+
+ /* read control register */
+ if ((i2c_transfer(client->adapter, &msgs[0], 2)) != 2) {
+ dev_err(&client->dev, "%s: read error\n", __func__);
+ return -EIO;
+ }
+
+ return 0;
}
-static int ds1672_detach(struct i2c_client *client)
+/* following are the sysfs callback functions */
+static ssize_t show_control(struct device *dev, struct device_attribute *attr,
+ char *buf)
{
+ struct i2c_client *client = to_i2c_client(dev);
+ u8 control;
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)))
+ err = ds1672_get_control(client, &control);
+ if (err)
return err;
- kfree(client);
-
- return 0;
+ return sprintf(buf, "%s\n", (control & DS1672_REG_CONTROL_EOSC)
+ ? "disabled" : "enabled");
}
-static struct i2c_driver ds1672_driver = {
- .driver = {
- .name = "ds1672",
- },
- .id = I2C_DRIVERID_DS1672,
- .attach_adapter = &ds1672_attach,
- .detach_client = &ds1672_detach,
+static DEVICE_ATTR(control, S_IRUGO, show_control, NULL);
+
+static const struct rtc_class_ops ds1672_rtc_ops = {
+ .read_time = ds1672_rtc_read_time,
+ .set_mmss = ds1672_rtc_set_mmss,
};
-static int ds1672_probe(struct i2c_adapter *adapter, int address, int kind)
+static int ds1672_remove(struct i2c_client *client)
{
- int err = 0;
- struct i2c_client *client;
- struct rtc_device *rtc;
-
- dev_dbg(&adapter->dev, "%s\n", __FUNCTION__);
+ struct rtc_device *rtc = i2c_get_clientdata(client);
- if (!i2c_check_functionality(adapter, I2C_FUNC_I2C)) {
- err = -ENODEV;
- goto exit;
- }
+ if (rtc)
+ rtc_device_unregister(rtc);
- if (!(client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL))) {
- err = -ENOMEM;
- goto exit;
- }
+ return 0;
+}
- /* I2C client */
- client->addr = address;
- client->driver = &ds1672_driver;
- client->adapter = adapter;
+static int ds1672_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ int err = 0;
+ u8 control;
+ struct rtc_device *rtc;
- strlcpy(client->name, ds1672_driver.driver.name, I2C_NAME_SIZE);
+ dev_dbg(&client->dev, "%s\n", __func__);
- /* Inform the i2c layer */
- if ((err = i2c_attach_client(client)))
- goto exit_kfree;
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
+ return -ENODEV;
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);
+ &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;
- }
+ if (IS_ERR(rtc))
+ return PTR_ERR(rtc);
i2c_set_clientdata(client, rtc);
- return 0;
+ /* read control register */
+ err = ds1672_get_control(client, &control);
+ if (err)
+ goto exit_devreg;
-exit_detach:
- i2c_detach_client(client);
+ if (control & DS1672_REG_CONTROL_EOSC)
+ dev_warn(&client->dev, "Oscillator not enabled. "
+ "Set time to enable.\n");
-exit_kfree:
- kfree(client);
+ /* Register sysfs hooks */
+ err = device_create_file(&client->dev, &dev_attr_control);
+ if (err)
+ goto exit_devreg;
-exit:
+ return 0;
+
+ exit_devreg:
+ rtc_device_unregister(rtc);
return err;
}
+static struct i2c_device_id ds1672_id[] = {
+ { "ds1672", 0 },
+ { }
+};
+
+static struct i2c_driver ds1672_driver = {
+ .driver = {
+ .name = "rtc-ds1672",
+ },
+ .probe = &ds1672_probe,
+ .remove = &ds1672_remove,
+ .id_table = ds1672_id,
+};
+
static int __init ds1672_init(void)
{
return i2c_add_driver(&ds1672_driver);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff