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drivers/rtc/rtc-m41t80.c: propagate error value from smbus functions

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Don't replace the value we got from the I2C layer, just pass it on.

Signed-off-by: Wolfram Sang <wsa@sang-engineering.com>
Cc: Jingoo Han <jg1.han@samsung.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Wolfram Sang 2014-06-06 14:35:46 -07:00 committed by Linus Torvalds
parent c67fedfab2
commit 85d77047c4
1 changed files with 23 additions and 14 deletions
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37
drivers/rtc/rtc-m41t80.c
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@ -230,7 +230,7 @@ static ssize_t m41t80_sysfs_show_flags(struct device *dev,
val = i2c_smbus_read_byte_data(client, M41T80_REG_FLAGS); val = i2c_smbus_read_byte_data(client, M41T80_REG_FLAGS);
if (val < 0) if (val < 0)
return -EIO; return val;
return sprintf(buf, "%#x\n", val); return sprintf(buf, "%#x\n", val);
} }
static DEVICE_ATTR(flags, S_IRUGO, m41t80_sysfs_show_flags, NULL); 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; reg_sqw = M41T80_REG_WDAY;
val = i2c_smbus_read_byte_data(client, reg_sqw); val = i2c_smbus_read_byte_data(client, reg_sqw);
if (val < 0) if (val < 0)
return -EIO; return val;
val = (val >> 4) & 0xf; val = (val >> 4) & 0xf;
switch (val) { switch (val) {
case 0: 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 i2c_client *client = to_i2c_client(dev);
struct m41t80_data *clientdata = i2c_get_clientdata(client); 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); int val = simple_strtoul(buf, NULL, 0);
if (!(clientdata->features & M41T80_FEATURE_SQ)) 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 */ /* disable SQW, set SQW frequency & re-enable */
almon = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_MON); almon = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_MON);
if (almon < 0) if (almon < 0)
return -EIO; return almon;
reg_sqw = M41T80_REG_SQW; reg_sqw = M41T80_REG_SQW;
if (clientdata->features & M41T80_FEATURE_SQ_ALT) if (clientdata->features & M41T80_FEATURE_SQ_ALT)
reg_sqw = M41T80_REG_WDAY; reg_sqw = M41T80_REG_WDAY;
sqw = i2c_smbus_read_byte_data(client, reg_sqw); sqw = i2c_smbus_read_byte_data(client, reg_sqw);
if (sqw < 0) if (sqw < 0)
return -EIO; return sqw;
sqw = (sqw & 0x0f) | (val << 4); sqw = (sqw & 0x0f) | (val << 4);
if (i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON,
almon & ~M41T80_ALMON_SQWE) < 0 || rc = i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON,
i2c_smbus_write_byte_data(client, reg_sqw, sqw) < 0) almon & ~M41T80_ALMON_SQWE);
return -EIO; if (rc < 0)
if (val && i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON, return rc;
almon | M41T80_ALMON_SQWE) < 0)
return -EIO; 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; return count;
} }
static DEVICE_ATTR(sqwfreq, S_IRUGO | S_IWUSR, static DEVICE_ATTR(sqwfreq, S_IRUGO | S_IWUSR,
@ -665,7 +674,7 @@ static int m41t80_probe(struct i2c_client *client,
if (rc < 0) { if (rc < 0) {
dev_err(&client->dev, "Can't clear HT bit\n"); dev_err(&client->dev, "Can't clear HT bit\n");
return -EIO; return rc;
} }
/* Make sure ST (stop) bit is cleared */ /* Make sure ST (stop) bit is cleared */
@ -676,7 +685,7 @@ static int m41t80_probe(struct i2c_client *client,
rc & ~M41T80_SEC_ST); rc & ~M41T80_SEC_ST);
if (rc < 0) { if (rc < 0) {
dev_err(&client->dev, "Can't clear ST bit\n"); dev_err(&client->dev, "Can't clear ST bit\n");
return -EIO; return rc;
} }
rc = m41t80_sysfs_register(&client->dev); rc = m41t80_sysfs_register(&client->dev);