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hwmon: (tmp401) Simplification and cleanup

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Use two-dimensional array pointing to registers
Merge temperature and limit access functions into a single function
Return error codes from I2C reads
Use DIV_ROUND_CLOSEST for rounding operations and improve rounding

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Jean Delvare <khali@linux-fr.org>
This commit is contained in:
Guenter Roeck 2013-03-27 21:23:10 -07:00
parent b4e665c780
commit 14f2a6654d
1 changed files with 136 additions and 233 deletions
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369
drivers/hwmon/tmp401.c
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@ -58,21 +58,32 @@ enum chips { tmp401, tmp411, tmp431 };
#define TMP401_MANUFACTURER_ID_REG 0xFE
#define TMP401_DEVICE_ID_REG 0xFF
static const u8 TMP401_TEMP_MSB[2] = { 0x00, 0x01 };
static const u8 TMP401_TEMP_LSB[2] = { 0x15, 0x10 };
static const u8 TMP401_TEMP_LOW_LIMIT_MSB_READ[2] = { 0x06, 0x08 };
static const u8 TMP401_TEMP_LOW_LIMIT_MSB_WRITE[2] = { 0x0C, 0x0E };
static const u8 TMP401_TEMP_LOW_LIMIT_LSB[2] = { 0x17, 0x14 };
static const u8 TMP401_TEMP_HIGH_LIMIT_MSB_READ[2] = { 0x05, 0x07 };
static const u8 TMP401_TEMP_HIGH_LIMIT_MSB_WRITE[2] = { 0x0B, 0x0D };
static const u8 TMP401_TEMP_HIGH_LIMIT_LSB[2] = { 0x16, 0x13 };
/* These are called the THERM limit / hysteresis / mask in the datasheet */
static const u8 TMP401_TEMP_CRIT_LIMIT[2] = { 0x20, 0x19 };
static const u8 TMP401_TEMP_MSB_READ[6][2] = {
{ 0x00, 0x01 }, /* temp */
{ 0x06, 0x08 }, /* low limit */
{ 0x05, 0x07 }, /* high limit */
{ 0x20, 0x19 }, /* therm (crit) limit */
{ 0x30, 0x34 }, /* lowest */
{ 0x32, 0x36 }, /* highest */
};
static const u8 TMP411_TEMP_LOWEST_MSB[2] = { 0x30, 0x34 };
static const u8 TMP411_TEMP_LOWEST_LSB[2] = { 0x31, 0x35 };
static const u8 TMP411_TEMP_HIGHEST_MSB[2] = { 0x32, 0x36 };
static const u8 TMP411_TEMP_HIGHEST_LSB[2] = { 0x33, 0x37 };
static const u8 TMP401_TEMP_MSB_WRITE[6][2] = {
{ 0, 0 }, /* temp (unused) */
{ 0x0C, 0x0E }, /* low limit */
{ 0x0B, 0x0D }, /* high limit */
{ 0x20, 0x19 }, /* therm (crit) limit */
{ 0x30, 0x34 }, /* lowest */
{ 0x32, 0x36 }, /* highest */
};
static const u8 TMP401_TEMP_LSB[6][2] = {
{ 0x15, 0x10 }, /* temp */
{ 0x17, 0x14 }, /* low limit */
{ 0x16, 0x13 }, /* high limit */
{ 0, 0 }, /* therm (crit) limit (unused) */
{ 0x31, 0x35 }, /* lowest */
{ 0x33, 0x37 }, /* highest */
};
/* Flags */
#define TMP401_CONFIG_RANGE BIT(2)
@ -119,13 +130,8 @@ struct tmp401_data {
/* register values */
u8 status;
u8 config;
u16 temp[2];
u16 temp_low[2];
u16 temp_high[2];
u8 temp_crit[2];
u16 temp[6][2];
u8 temp_crit_hyst;
u16 temp_lowest[2];
u16 temp_highest[2];
};
/*
@ -139,10 +145,10 @@ static int tmp401_register_to_temp(u16 reg, u8 config)
if (config & TMP401_CONFIG_RANGE)
temp -= 64 * 256;
return (temp * 625 + 80) / 160;
return DIV_ROUND_CLOSEST(temp * 125, 32);
}
static u16 tmp401_temp_to_register(long temp, u8 config)
static u16 tmp401_temp_to_register(long temp, u8 config, int zbits)
{
if (config & TMP401_CONFIG_RANGE) {
temp = clamp_val(temp, -64000, 191000);
@ -150,134 +156,93 @@ static u16 tmp401_temp_to_register(long temp, u8 config)
} else
temp = clamp_val(temp, 0, 127000);
return (temp * 160 + 312) / 625;
return DIV_ROUND_CLOSEST(temp * (1 << (8 - zbits)), 1000) << zbits;
}
static int tmp401_crit_register_to_temp(u8 reg, u8 config)
static int tmp401_update_device_reg16(struct i2c_client *client,
struct tmp401_data *data)
{
int temp = reg;
int i, j, val;
int num_regs = data->kind == tmp411 ? 6 : 4;
if (config & TMP401_CONFIG_RANGE)
temp -= 64;
return temp * 1000;
}
static u8 tmp401_crit_temp_to_register(long temp, u8 config)
{
if (config & TMP401_CONFIG_RANGE) {
temp = clamp_val(temp, -64000, 191000);
temp += 64000;
} else
temp = clamp_val(temp, 0, 127000);
return (temp + 500) / 1000;
}
static struct tmp401_data *tmp401_update_device_reg16(
struct i2c_client *client, struct tmp401_data *data)
{
int i;
for (i = 0; i < 2; i++) {
/*
* High byte must be read first immediately followed
* by the low byte
*/
data->temp[i] = i2c_smbus_read_byte_data(client,
TMP401_TEMP_MSB[i]) << 8;
data->temp[i] |= i2c_smbus_read_byte_data(client,
TMP401_TEMP_LSB[i]);
data->temp_low[i] = i2c_smbus_read_byte_data(client,
TMP401_TEMP_LOW_LIMIT_MSB_READ[i]) << 8;
data->temp_low[i] |= i2c_smbus_read_byte_data(client,
TMP401_TEMP_LOW_LIMIT_LSB[i]);
data->temp_high[i] = i2c_smbus_read_byte_data(client,
TMP401_TEMP_HIGH_LIMIT_MSB_READ[i]) << 8;
data->temp_high[i] |= i2c_smbus_read_byte_data(client,
TMP401_TEMP_HIGH_LIMIT_LSB[i]);
data->temp_crit[i] = i2c_smbus_read_byte_data(client,
TMP401_TEMP_CRIT_LIMIT[i]);
if (data->kind == tmp411) {
data->temp_lowest[i] = i2c_smbus_read_byte_data(client,
TMP411_TEMP_LOWEST_MSB[i]) << 8;
data->temp_lowest[i] |= i2c_smbus_read_byte_data(
client, TMP411_TEMP_LOWEST_LSB[i]);
data->temp_highest[i] = i2c_smbus_read_byte_data(
client, TMP411_TEMP_HIGHEST_MSB[i]) << 8;
data->temp_highest[i] |= i2c_smbus_read_byte_data(
client, TMP411_TEMP_HIGHEST_LSB[i]);
for (i = 0; i < 2; i++) { /* local / rem1 */
for (j = 0; j < num_regs; j++) { /* temp / low / ... */
/*
* High byte must be read first immediately followed
* by the low byte
*/
val = i2c_smbus_read_byte_data(client,
TMP401_TEMP_MSB_READ[j][i]);
if (val < 0)
return val;
data->temp[j][i] = val << 8;
if (j == 3) /* crit is msb only */
continue;
val = i2c_smbus_read_byte_data(client,
TMP401_TEMP_LSB[j][i]);
if (val < 0)
return val;
data->temp[j][i] |= val;
}
}
return data;
return 0;
}
static struct tmp401_data *tmp401_update_device(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct tmp401_data *data = i2c_get_clientdata(client);
struct tmp401_data *ret = data;
int val;
mutex_lock(&data->update_lock);
if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
data->status = i2c_smbus_read_byte_data(client, TMP401_STATUS);
data->config = i2c_smbus_read_byte_data(client,
TMP401_CONFIG_READ);
tmp401_update_device_reg16(client, data);
data->temp_crit_hyst = i2c_smbus_read_byte_data(client,
TMP401_TEMP_CRIT_HYST);
val = i2c_smbus_read_byte_data(client, TMP401_STATUS);
if (val < 0) {
ret = ERR_PTR(val);
goto abort;
}
data->status = val;
val = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
if (val < 0) {
ret = ERR_PTR(val);
goto abort;
}
data->config = val;
val = tmp401_update_device_reg16(client, data);
if (val < 0) {
ret = ERR_PTR(val);
goto abort;
}
val = i2c_smbus_read_byte_data(client, TMP401_TEMP_CRIT_HYST);
if (val < 0) {
ret = ERR_PTR(val);
goto abort;
}
data->temp_crit_hyst = val;
data->last_updated = jiffies;
data->valid = 1;
}
abort:
mutex_unlock(&data->update_lock);
return data;
return ret;
}
static ssize_t show_temp_value(struct device *dev,
struct device_attribute *devattr, char *buf)
static ssize_t show_temp(struct device *dev,
struct device_attribute *devattr, char *buf)
{
int index = to_sensor_dev_attr(devattr)->index;
int nr = to_sensor_dev_attr_2(devattr)->nr;
int index = to_sensor_dev_attr_2(devattr)->index;
struct tmp401_data *data = tmp401_update_device(dev);
return sprintf(buf, "%d\n",
tmp401_register_to_temp(data->temp[index], data->config));
}
static ssize_t show_temp_min(struct device *dev,
struct device_attribute *devattr, char *buf)
{
int index = to_sensor_dev_attr(devattr)->index;
struct tmp401_data *data = tmp401_update_device(dev);
if (IS_ERR(data))
return PTR_ERR(data);
return sprintf(buf, "%d\n",
tmp401_register_to_temp(data->temp_low[index], data->config));
}
static ssize_t show_temp_max(struct device *dev,
struct device_attribute *devattr, char *buf)
{
int index = to_sensor_dev_attr(devattr)->index;
struct tmp401_data *data = tmp401_update_device(dev);
return sprintf(buf, "%d\n",
tmp401_register_to_temp(data->temp_high[index], data->config));
}
static ssize_t show_temp_crit(struct device *dev,
struct device_attribute *devattr, char *buf)
{
int index = to_sensor_dev_attr(devattr)->index;
struct tmp401_data *data = tmp401_update_device(dev);
return sprintf(buf, "%d\n",
tmp401_crit_register_to_temp(data->temp_crit[index],
data->config));
tmp401_register_to_temp(data->temp[nr][index], data->config));
}
static ssize_t show_temp_crit_hyst(struct device *dev,
@ -286,122 +251,58 @@ static ssize_t show_temp_crit_hyst(struct device *dev,
int temp, index = to_sensor_dev_attr(devattr)->index;
struct tmp401_data *data = tmp401_update_device(dev);
if (IS_ERR(data))
return PTR_ERR(data);
mutex_lock(&data->update_lock);
temp = tmp401_crit_register_to_temp(data->temp_crit[index],
data->config);
temp = tmp401_register_to_temp(data->temp[3][index], data->config);
temp -= data->temp_crit_hyst * 1000;
mutex_unlock(&data->update_lock);
return sprintf(buf, "%d\n", temp);
}
static ssize_t show_temp_lowest(struct device *dev,
struct device_attribute *devattr, char *buf)
{
int index = to_sensor_dev_attr(devattr)->index;
struct tmp401_data *data = tmp401_update_device(dev);
return sprintf(buf, "%d\n",
tmp401_register_to_temp(data->temp_lowest[index],
data->config));
}
static ssize_t show_temp_highest(struct device *dev,
struct device_attribute *devattr, char *buf)
{
int index = to_sensor_dev_attr(devattr)->index;
struct tmp401_data *data = tmp401_update_device(dev);
return sprintf(buf, "%d\n",
tmp401_register_to_temp(data->temp_highest[index],
data->config));
}
static ssize_t show_status(struct device *dev,
struct device_attribute *devattr, char *buf)
{
int mask = to_sensor_dev_attr(devattr)->index;
struct tmp401_data *data = tmp401_update_device(dev);
if (data->status & mask)
return sprintf(buf, "1\n");
else
return sprintf(buf, "0\n");
if (IS_ERR(data))
return PTR_ERR(data);
return sprintf(buf, "%d\n", !!(data->status & mask));
}
static ssize_t store_temp_min(struct device *dev, struct device_attribute
*devattr, const char *buf, size_t count)
static ssize_t store_temp(struct device *dev, struct device_attribute *devattr,
const char *buf, size_t count)
{
int index = to_sensor_dev_attr(devattr)->index;
int nr = to_sensor_dev_attr_2(devattr)->nr;
int index = to_sensor_dev_attr_2(devattr)->index;
struct i2c_client *client = to_i2c_client(dev);
struct tmp401_data *data = tmp401_update_device(dev);
long val;
u16 reg;
if (kstrtol(buf, 10, &val))
return -EINVAL;
reg = tmp401_temp_to_register(val, data->config);
mutex_lock(&data->update_lock);
i2c_smbus_write_byte_data(to_i2c_client(dev),
TMP401_TEMP_LOW_LIMIT_MSB_WRITE[index], reg >> 8);
i2c_smbus_write_byte_data(to_i2c_client(dev),
TMP401_TEMP_LOW_LIMIT_LSB[index], reg & 0xFF);
data->temp_low[index] = reg;
mutex_unlock(&data->update_lock);
return count;
}
static ssize_t store_temp_max(struct device *dev, struct device_attribute
*devattr, const char *buf, size_t count)
{
int index = to_sensor_dev_attr(devattr)->index;
struct tmp401_data *data = tmp401_update_device(dev);
long val;
u16 reg;
if (IS_ERR(data))
return PTR_ERR(data);
if (kstrtol(buf, 10, &val))
return -EINVAL;
reg = tmp401_temp_to_register(val, data->config);
reg = tmp401_temp_to_register(val, data->config, nr == 3 ? 8 : 4);
mutex_lock(&data->update_lock);
i2c_smbus_write_byte_data(to_i2c_client(dev),
TMP401_TEMP_HIGH_LIMIT_MSB_WRITE[index], reg >> 8);
i2c_smbus_write_byte_data(to_i2c_client(dev),
TMP401_TEMP_HIGH_LIMIT_LSB[index], reg & 0xFF);
data->temp_high[index] = reg;
mutex_unlock(&data->update_lock);
return count;
}
static ssize_t store_temp_crit(struct device *dev, struct device_attribute
*devattr, const char *buf, size_t count)
{
int index = to_sensor_dev_attr(devattr)->index;
struct tmp401_data *data = tmp401_update_device(dev);
long val;
u8 reg;
if (kstrtol(buf, 10, &val))
return -EINVAL;
reg = tmp401_crit_temp_to_register(val, data->config);
mutex_lock(&data->update_lock);
i2c_smbus_write_byte_data(to_i2c_client(dev),
TMP401_TEMP_CRIT_LIMIT[index], reg);
data->temp_crit[index] = reg;
i2c_smbus_write_byte_data(client,
TMP401_TEMP_MSB_WRITE[nr][index],
reg >> 8);
if (nr != 3) {
i2c_smbus_write_byte_data(client,
TMP401_TEMP_LSB[nr][index],
reg & 0xFF);
}
data->temp[nr][index] = reg;
mutex_unlock(&data->update_lock);
@ -416,6 +317,9 @@ static ssize_t store_temp_crit_hyst(struct device *dev, struct device_attribute
long val;
u8 reg;
if (IS_ERR(data))
return PTR_ERR(data);
if (kstrtol(buf, 10, &val))
return -EINVAL;
@ -425,13 +329,12 @@ static ssize_t store_temp_crit_hyst(struct device *dev, struct device_attribute
val = clamp_val(val, 0, 127000);
mutex_lock(&data->update_lock);
temp = tmp401_crit_register_to_temp(data->temp_crit[index],
data->config);
temp = tmp401_register_to_temp(data->temp[3][index], data->config);
val = clamp_val(val, temp - 255000, temp);
reg = ((temp - val) + 500) / 1000;
i2c_smbus_write_byte_data(to_i2c_client(dev),
TMP401_TEMP_CRIT_HYST, reg);
i2c_smbus_write_byte_data(to_i2c_client(dev), TMP401_TEMP_CRIT_HYST,
reg);
data->temp_crit_hyst = reg;
@ -460,18 +363,18 @@ static ssize_t reset_temp_history(struct device *dev,
return -EINVAL;
}
i2c_smbus_write_byte_data(to_i2c_client(dev),
TMP411_TEMP_LOWEST_MSB[0], val);
TMP401_TEMP_MSB_WRITE[5][0], val);
return count;
}
static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_value, NULL, 0);
static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp_min,
store_temp_min, 0);
static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_max,
store_temp_max, 0);
static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp_crit,
store_temp_crit, 0);
static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0, 0);
static SENSOR_DEVICE_ATTR_2(temp1_min, S_IWUSR | S_IRUGO, show_temp,
store_temp, 1, 0);
static SENSOR_DEVICE_ATTR_2(temp1_max, S_IWUSR | S_IRUGO, show_temp,
store_temp, 2, 0);
static SENSOR_DEVICE_ATTR_2(temp1_crit, S_IWUSR | S_IRUGO, show_temp,
store_temp, 3, 0);
static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO,
show_temp_crit_hyst, store_temp_crit_hyst, 0);
static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_status, NULL,
@ -480,13 +383,13 @@ static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_status, NULL,
TMP401_STATUS_LOCAL_HIGH);
static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_status, NULL,
TMP401_STATUS_LOCAL_CRIT);
static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_value, NULL, 1);
static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp_min,
store_temp_min, 1);
static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp_max,
store_temp_max, 1);
static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp_crit,
store_temp_crit, 1);
static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 0, 1);
static SENSOR_DEVICE_ATTR_2(temp2_min, S_IWUSR | S_IRUGO, show_temp,
store_temp, 1, 1);
static SENSOR_DEVICE_ATTR_2(temp2_max, S_IWUSR | S_IRUGO, show_temp,
store_temp, 2, 1);
static SENSOR_DEVICE_ATTR_2(temp2_crit, S_IWUSR | S_IRUGO, show_temp,
store_temp, 3, 1);
static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_temp_crit_hyst,
NULL, 1);
static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_status, NULL,
@ -532,10 +435,10 @@ static const struct attribute_group tmp401_group = {
* minimum and maximum register reset for both the local
* and remote channels.
*/
static SENSOR_DEVICE_ATTR(temp1_highest, S_IRUGO, show_temp_highest, NULL, 0);
static SENSOR_DEVICE_ATTR(temp1_lowest, S_IRUGO, show_temp_lowest, NULL, 0);
static SENSOR_DEVICE_ATTR(temp2_highest, S_IRUGO, show_temp_highest, NULL, 1);
static SENSOR_DEVICE_ATTR(temp2_lowest, S_IRUGO, show_temp_lowest, NULL, 1);
static SENSOR_DEVICE_ATTR_2(temp1_lowest, S_IRUGO, show_temp, NULL, 4, 0);
static SENSOR_DEVICE_ATTR_2(temp1_highest, S_IRUGO, show_temp, NULL, 5, 0);
static SENSOR_DEVICE_ATTR_2(temp2_lowest, S_IRUGO, show_temp, NULL, 4, 1);
static SENSOR_DEVICE_ATTR_2(temp2_highest, S_IRUGO, show_temp, NULL, 5, 1);
static SENSOR_DEVICE_ATTR(temp_reset_history, S_IWUSR, NULL, reset_temp_history,
0);