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hwmon: (emc6w201) Properly handle all errors

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Handle errors on 8-bit register reads and writes too. Also use likely
and unlikely to make the functions faster on success.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Acked-by: Guenter Roeck <guenter.roeck@ericsson.com>
This commit is contained in:
Jean Delvare 2011-07-03 13:32:53 +02:00 committed by Jean Delvare
parent b0af8dfdd6
commit b6b2a1e806
1 changed files with 44 additions and 14 deletions
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58
drivers/hwmon/emc6w201.c
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@ -78,8 +78,9 @@ static u16 emc6w201_read16(struct i2c_client *client, u8 reg)
lsb = i2c_smbus_read_byte_data(client, reg);
msb = i2c_smbus_read_byte_data(client, reg + 1);
if (lsb < 0 || msb < 0) {
dev_err(&client->dev, "16-bit read failed at 0x%02x\n", reg);
if (unlikely(lsb < 0 || msb < 0)) {
dev_err(&client->dev, "%d-bit %s failed at 0x%02x\n",
16, "read", reg);
return 0xFFFF; /* Arbitrary value */
}
@ -95,10 +96,39 @@ static int emc6w201_write16(struct i2c_client *client, u8 reg, u16 val)
int err;
err = i2c_smbus_write_byte_data(client, reg, val & 0xff);
if (!err)
if (likely(!err))
err = i2c_smbus_write_byte_data(client, reg + 1, val >> 8);
if (err < 0)
dev_err(&client->dev, "16-bit write failed at 0x%02x\n", reg);
if (unlikely(err < 0))
dev_err(&client->dev, "%d-bit %s failed at 0x%02x\n",
16, "write", reg);
return err;
}
/* Read 8-bit value from register */
static u8 emc6w201_read8(struct i2c_client *client, u8 reg)
{
int val;
val = i2c_smbus_read_byte_data(client, reg);
if (unlikely(val < 0)) {
dev_err(&client->dev, "%d-bit %s failed at 0x%02x\n",
8, "read", reg);
return 0x00; /* Arbitrary value */
}
return val;
}
/* Write 8-bit value to register */
static int emc6w201_write8(struct i2c_client *client, u8 reg, u8 val)
{
int err;
err = i2c_smbus_write_byte_data(client, reg, val);
if (unlikely(err < 0))
dev_err(&client->dev, "%d-bit %s failed at 0x%02x\n",
8, "write", reg);
return err;
}
@ -114,25 +144,25 @@ static struct emc6w201_data *emc6w201_update_device(struct device *dev)
if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
for (nr = 0; nr < 6; nr++) {
data->in[input][nr] =
i2c_smbus_read_byte_data(client,
emc6w201_read8(client,
EMC6W201_REG_IN(nr));
data->in[min][nr] =
i2c_smbus_read_byte_data(client,
emc6w201_read8(client,
EMC6W201_REG_IN_LOW(nr));
data->in[max][nr] =
i2c_smbus_read_byte_data(client,
emc6w201_read8(client,
EMC6W201_REG_IN_HIGH(nr));
}
for (nr = 0; nr < 6; nr++) {
data->temp[input][nr] =
i2c_smbus_read_byte_data(client,
emc6w201_read8(client,
EMC6W201_REG_TEMP(nr));
data->temp[min][nr] =
i2c_smbus_read_byte_data(client,
emc6w201_read8(client,
EMC6W201_REG_TEMP_LOW(nr));
data->temp[max][nr] =
i2c_smbus_read_byte_data(client,
emc6w201_read8(client,
EMC6W201_REG_TEMP_HIGH(nr));
}
@ -192,7 +222,7 @@ static ssize_t set_in(struct device *dev, struct device_attribute *devattr,
mutex_lock(&data->update_lock);
data->in[sf][nr] = SENSORS_LIMIT(val, 0, 255);
err = i2c_smbus_write_byte_data(client, reg, data->in[sf][nr]);
err = emc6w201_write8(client, reg, data->in[sf][nr]);
mutex_unlock(&data->update_lock);
return err < 0 ? err : count;
@ -229,7 +259,7 @@ static ssize_t set_temp(struct device *dev, struct device_attribute *devattr,
mutex_lock(&data->update_lock);
data->temp[sf][nr] = SENSORS_LIMIT(val, -127, 128);
err = i2c_smbus_write_byte_data(client, reg, data->temp[sf][nr]);
err = emc6w201_write8(client, reg, data->temp[sf][nr]);
mutex_unlock(&data->update_lock);
return err < 0 ? err : count;
@ -444,7 +474,7 @@ static int emc6w201_detect(struct i2c_client *client,
/* Check configuration */
config = i2c_smbus_read_byte_data(client, EMC6W201_REG_CONFIG);
if ((config & 0xF4) != 0x04)
if (config < 0 || (config & 0xF4) != 0x04)
return -ENODEV;
if (!(config & 0x01)) {
dev_err(&client->dev, "Monitoring not enabled\n");