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path: root/drivers/rtc/rtc-m41t80.c
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Diffstat (limited to 'drivers/rtc/rtc-m41t80.c')
-rw-r--r--drivers/rtc/rtc-m41t80.c37
1 files changed, 23 insertions, 14 deletions
diff --git a/drivers/rtc/rtc-m41t80.c b/drivers/rtc/rtc-m41t80.c
index 86eccb1..d348b23 100644
--- a/drivers/rtc/rtc-m41t80.c
+++ b/drivers/rtc/rtc-m41t80.c
@@ -230,7 +230,7 @@ static ssize_t m41t80_sysfs_show_flags(struct device *dev,
val = i2c_smbus_read_byte_data(client, M41T80_REG_FLAGS);
if (val < 0)
- return -EIO;
+ return val;
return sprintf(buf, "%#x\n", val);
}
static DEVICE_ATTR(flags, S_IRUGO, m41t80_sysfs_show_flags, NULL);
@@ -250,7 +250,7 @@ static ssize_t m41t80_sysfs_show_sqwfreq(struct device *dev,
reg_sqw = M41T80_REG_WDAY;
val = i2c_smbus_read_byte_data(client, reg_sqw);
if (val < 0)
- return -EIO;
+ return val;
val = (val >> 4) & 0xf;
switch (val) {
case 0:
@@ -269,7 +269,7 @@ static ssize_t m41t80_sysfs_set_sqwfreq(struct device *dev,
{
struct i2c_client *client = to_i2c_client(dev);
struct m41t80_data *clientdata = i2c_get_clientdata(client);
- int almon, sqw, reg_sqw;
+ int almon, sqw, reg_sqw, rc;
int val = simple_strtoul(buf, NULL, 0);
if (!(clientdata->features & M41T80_FEATURE_SQ))
@@ -289,21 +289,30 @@ static ssize_t m41t80_sysfs_set_sqwfreq(struct device *dev,
/* disable SQW, set SQW frequency & re-enable */
almon = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_MON);
if (almon < 0)
- return -EIO;
+ return almon;
reg_sqw = M41T80_REG_SQW;
if (clientdata->features & M41T80_FEATURE_SQ_ALT)
reg_sqw = M41T80_REG_WDAY;
sqw = i2c_smbus_read_byte_data(client, reg_sqw);
if (sqw < 0)
- return -EIO;
+ return sqw;
sqw = (sqw & 0x0f) | (val << 4);
- if (i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON,
- almon & ~M41T80_ALMON_SQWE) < 0 ||
- i2c_smbus_write_byte_data(client, reg_sqw, sqw) < 0)
- return -EIO;
- if (val && i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON,
- almon | M41T80_ALMON_SQWE) < 0)
- return -EIO;
+
+ rc = i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON,
+ almon & ~M41T80_ALMON_SQWE);
+ if (rc < 0)
+ return rc;
+
+ if (val) {
+ rc = i2c_smbus_write_byte_data(client, reg_sqw, sqw);
+ if (rc < 0)
+ return rc;
+
+ rc = i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON,
+ almon | M41T80_ALMON_SQWE);
+ if (rc <0)
+ return rc;
+ }
return count;
}
static DEVICE_ATTR(sqwfreq, S_IRUGO | S_IWUSR,
@@ -665,7 +674,7 @@ static int m41t80_probe(struct i2c_client *client,
if (rc < 0) {
dev_err(&client->dev, "Can't clear HT bit\n");
- return -EIO;
+ return rc;
}
/* Make sure ST (stop) bit is cleared */
@@ -676,7 +685,7 @@ static int m41t80_probe(struct i2c_client *client,
rc & ~M41T80_SEC_ST);
if (rc < 0) {
dev_err(&client->dev, "Can't clear ST bit\n");
- return -EIO;
+ return rc;
}
rc = m41t80_sysfs_register(&client->dev);
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