* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
- * Driver for Dallas Semiconductor DS1337 real time clock chip
+ * Driver for Dallas Semiconductor DS1337 and DS1339 real time clock chip
*/
-#include <linux/config.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
struct ds1337_data {
struct i2c_client client;
struct list_head list;
- int id;
};
/*
* Internal variables
*/
-static int ds1337_id;
static LIST_HEAD(ds1337_clients);
static inline int ds1337_read(struct i2c_client *client, u8 reg, u8 *value)
__FUNCTION__, result, buf[0], buf[1], buf[2], buf[3],
buf[4], buf[5], buf[6]);
- if (result >= 0) {
+ if (result == 2) {
dt->tm_sec = BCD2BIN(buf[0]);
dt->tm_min = BCD2BIN(buf[1]);
val = buf[2] & 0x3f;
dt->tm_wday = BCD2BIN(buf[3]) - 1;
dt->tm_mday = BCD2BIN(buf[4]);
val = buf[5] & 0x7f;
- dt->tm_mon = BCD2BIN(val);
- dt->tm_year = 1900 + BCD2BIN(buf[6]);
+ dt->tm_mon = BCD2BIN(val) - 1;
+ dt->tm_year = BCD2BIN(buf[6]);
if (buf[5] & 0x80)
dt->tm_year += 100;
__FUNCTION__, dt->tm_sec, dt->tm_min,
dt->tm_hour, dt->tm_mday,
dt->tm_mon, dt->tm_year, dt->tm_wday);
- } else {
- dev_err(&client->dev, "error reading data! %d\n", result);
- result = -EIO;
+
+ return 0;
}
- return result;
+ dev_err(&client->dev, "error reading data! %d\n", result);
+ return -EIO;
}
static int ds1337_set_datetime(struct i2c_client *client, struct rtc_time *dt)
buf[3] = BIN2BCD(dt->tm_hour) | (1 << 6);
buf[4] = BIN2BCD(dt->tm_wday) + 1;
buf[5] = BIN2BCD(dt->tm_mday);
- buf[6] = BIN2BCD(dt->tm_mon);
- if (dt->tm_year >= 2000) {
- val = dt->tm_year - 2000;
+ buf[6] = BIN2BCD(dt->tm_mon) + 1;
+ val = dt->tm_year;
+ if (val >= 100) {
+ val -= 100;
buf[6] |= (1 << 7);
- } else {
- val = dt->tm_year - 1900;
}
buf[7] = BIN2BCD(val);
msg[0].buf = &buf[0];
result = i2c_transfer(client->adapter, msg, 1);
- if (result < 0) {
- dev_err(&client->dev, "error writing data! %d\n", result);
- result = -EIO;
- } else {
- result = 0;
- }
+ if (result == 1)
+ return 0;
- return result;
+ dev_err(&client->dev, "error writing data! %d\n", result);
+ return -EIO;
}
static int ds1337_command(struct i2c_client *client, unsigned int cmd,
* Public API for access to specific device. Useful for low-level
* RTC access from kernel code.
*/
-int ds1337_do_command(int id, int cmd, void *arg)
+int ds1337_do_command(int bus, int cmd, void *arg)
{
struct list_head *walk;
struct list_head *tmp;
list_for_each_safe(walk, tmp, &ds1337_clients) {
data = list_entry(walk, struct ds1337_data, list);
- if (data->id == id)
+ if (data->client.adapter->nr == bus)
return ds1337_command(&data->client, cmd, arg);
}
ds1337_init_client(new_client);
/* Add client to local list */
- data->id = ds1337_id++;
list_add(&data->list, &ds1337_clients);
return 0;
MODULE_DESCRIPTION("DS1337 RTC driver");
MODULE_LICENSE("GPL");
+EXPORT_SYMBOL_GPL(ds1337_do_command);
+
module_init(ds1337_init);
module_exit(ds1337_exit);