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path: root/drivers/i2c/chips/ds1337.c
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Diffstat (limited to 'drivers/i2c/chips/ds1337.c')
-rw-r--r--drivers/i2c/chips/ds1337.c101
1 files changed, 42 insertions, 59 deletions
diff --git a/drivers/i2c/chips/ds1337.c b/drivers/i2c/chips/ds1337.c
index 07f16c3fb08..82cf959989f 100644
--- a/drivers/i2c/chips/ds1337.c
+++ b/drivers/i2c/chips/ds1337.c
@@ -3,17 +3,16 @@
*
* Copyright (C) 2005 James Chapman <jchapman@katalix.com>
*
- * based on linux/drivers/acron/char/pcf8583.c
+ * based on linux/drivers/acorn/char/pcf8583.c
* Copyright (C) 2000 Russell King
*
* 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.
*
- * 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>
@@ -69,13 +68,11 @@ static struct i2c_driver ds1337_driver = {
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)
@@ -95,7 +92,6 @@ static inline int ds1337_read(struct i2c_client *client, u8 reg, u8 *value)
*/
static int ds1337_get_datetime(struct i2c_client *client, struct rtc_time *dt)
{
- struct ds1337_data *data = i2c_get_clientdata(client);
int result;
u8 buf[7];
u8 val;
@@ -103,9 +99,7 @@ static int ds1337_get_datetime(struct i2c_client *client, struct rtc_time *dt)
u8 offs = 0;
if (!dt) {
- dev_dbg(&client->adapter->dev, "%s: EINVAL: dt=NULL\n",
- __FUNCTION__);
-
+ dev_dbg(&client->dev, "%s: EINVAL: dt=NULL\n", __FUNCTION__);
return -EINVAL;
}
@@ -119,98 +113,86 @@ static int ds1337_get_datetime(struct i2c_client *client, struct rtc_time *dt)
msg[1].len = sizeof(buf);
msg[1].buf = &buf[0];
- result = client->adapter->algo->master_xfer(client->adapter,
- &msg[0], 2);
+ result = i2c_transfer(client->adapter, msg, 2);
- dev_dbg(&client->adapter->dev,
- "%s: [%d] %02x %02x %02x %02x %02x %02x %02x\n",
+ dev_dbg(&client->dev, "%s: [%d] %02x %02x %02x %02x %02x %02x %02x\n",
__FUNCTION__, result, buf[0], buf[1], buf[2], buf[3],
buf[4], buf[5], buf[6]);
- if (result >= 0) {
- dt->tm_sec = BCD_TO_BIN(buf[0]);
- dt->tm_min = BCD_TO_BIN(buf[1]);
+ if (result == 2) {
+ dt->tm_sec = BCD2BIN(buf[0]);
+ dt->tm_min = BCD2BIN(buf[1]);
val = buf[2] & 0x3f;
- dt->tm_hour = BCD_TO_BIN(val);
- dt->tm_wday = BCD_TO_BIN(buf[3]) - 1;
- dt->tm_mday = BCD_TO_BIN(buf[4]);
+ dt->tm_hour = BCD2BIN(val);
+ dt->tm_wday = BCD2BIN(buf[3]) - 1;
+ dt->tm_mday = BCD2BIN(buf[4]);
val = buf[5] & 0x7f;
- dt->tm_mon = BCD_TO_BIN(val);
- dt->tm_year = 1900 + BCD_TO_BIN(buf[6]);
+ dt->tm_mon = BCD2BIN(val) - 1;
+ dt->tm_year = BCD2BIN(buf[6]);
if (buf[5] & 0x80)
dt->tm_year += 100;
- dev_dbg(&client->adapter->dev, "%s: secs=%d, mins=%d, "
+ dev_dbg(&client->dev, "%s: secs=%d, mins=%d, "
"hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n",
__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->adapter->dev, "ds1337[%d]: error reading "
- "data! %d\n", data->id, 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)
{
- struct ds1337_data *data = i2c_get_clientdata(client);
int result;
u8 buf[8];
u8 val;
struct i2c_msg msg[1];
if (!dt) {
- dev_dbg(&client->adapter->dev, "%s: EINVAL: dt=NULL\n",
- __FUNCTION__);
-
+ dev_dbg(&client->dev, "%s: EINVAL: dt=NULL\n", __FUNCTION__);
return -EINVAL;
}
- dev_dbg(&client->adapter->dev, "%s: secs=%d, mins=%d, hours=%d, "
+ dev_dbg(&client->dev, "%s: secs=%d, mins=%d, hours=%d, "
"mday=%d, mon=%d, year=%d, wday=%d\n", __FUNCTION__,
dt->tm_sec, dt->tm_min, dt->tm_hour,
dt->tm_mday, dt->tm_mon, dt->tm_year, dt->tm_wday);
buf[0] = 0; /* reg offset */
- buf[1] = BIN_TO_BCD(dt->tm_sec);
- buf[2] = BIN_TO_BCD(dt->tm_min);
- buf[3] = BIN_TO_BCD(dt->tm_hour) | (1 << 6);
- buf[4] = BIN_TO_BCD(dt->tm_wday) + 1;
- buf[5] = BIN_TO_BCD(dt->tm_mday);
- buf[6] = BIN_TO_BCD(dt->tm_mon);
- if (dt->tm_year >= 2000) {
- val = dt->tm_year - 2000;
+ buf[1] = BIN2BCD(dt->tm_sec);
+ buf[2] = BIN2BCD(dt->tm_min);
+ buf[3] = BIN2BCD(dt->tm_hour);
+ buf[4] = BIN2BCD(dt->tm_wday) + 1;
+ buf[5] = BIN2BCD(dt->tm_mday);
+ 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] = BIN_TO_BCD(val);
+ buf[7] = BIN2BCD(val);
msg[0].addr = client->addr;
msg[0].flags = 0;
msg[0].len = sizeof(buf);
msg[0].buf = &buf[0];
- result = client->adapter->algo->master_xfer(client->adapter,
- &msg[0], 1);
- if (result < 0) {
- dev_err(&client->adapter->dev, "ds1337[%d]: error "
- "writing data! %d\n", data->id, result);
- result = -EIO;
- } else {
- result = 0;
- }
+ result = i2c_transfer(client->adapter, msg, 1);
+ 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,
void *arg)
{
- dev_dbg(&client->adapter->dev, "%s: cmd=%d\n", __FUNCTION__, cmd);
+ dev_dbg(&client->dev, "%s: cmd=%d\n", __FUNCTION__, cmd);
switch (cmd) {
case DS1337_GET_DATE:
@@ -228,7 +210,7 @@ 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;
@@ -236,7 +218,7 @@ int ds1337_do_command(int id, int cmd, void *arg)
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);
}
@@ -346,7 +328,6 @@ static int ds1337_detect(struct i2c_adapter *adapter, int address, int kind)
ds1337_init_client(new_client);
/* Add client to local list */
- data->id = ds1337_id++;
list_add(&data->list, &ds1337_clients);
return 0;
@@ -363,9 +344,9 @@ static void ds1337_init_client(struct i2c_client *client)
/* Ensure that device is set in 24-hour mode */
val = i2c_smbus_read_byte_data(client, DS1337_REG_HOUR);
- if ((val >= 0) && (val & (1 << 6)) == 0)
+ if ((val >= 0) && (val & (1 << 6)))
i2c_smbus_write_byte_data(client, DS1337_REG_HOUR,
- val | (1 << 6));
+ val & 0x3f);
}
static int ds1337_detach_client(struct i2c_client *client)
@@ -398,5 +379,7 @@ MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
MODULE_DESCRIPTION("DS1337 RTC driver");
MODULE_LICENSE("GPL");
+EXPORT_SYMBOL_GPL(ds1337_do_command);
+
module_init(ds1337_init);
module_exit(ds1337_exit);
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-14 18:19:46 +0000