diff options
Diffstat (limited to 'drivers/rtc')
| -rw-r--r-- | drivers/rtc/rtc-m41t80.c | 37 |
1 files changed, 23 insertions, 14 deletions
diff --git a/drivers/rtc/rtc-m41t80.c b/drivers/rtc/rtc-m41t80.c index 86eccb15f524..d348b23ce18b 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); |