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hwmon: (lm63) Add support for update_interval sysfs attribute

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The update interval is configurable on LM63 and compatibles. Add
support for it.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
This commit is contained in:
Guenter Roeck 2012-01-16 22:51:46 +01:00 committed by Jean Delvare
parent 94e55df48a
commit 04738b2b2f
2 changed files with 93 additions and 5 deletions
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6
Documentation/hwmon/lm63
View File

@ -61,9 +61,9 @@ PWM modes: manual and automatic. Automatic mode is not fully implemented yet
(you cannot define your custom PWM/temperature curve), and mode change isn't
supported either.
The lm63 driver will not update its values more frequently than every
second; reading them more often will do no harm, but will return 'old'
values.
The lm63 driver will not update its values more frequently than configured with
the update_interval sysfs attribute; reading them more often will do no harm,
but will return 'old' values.
The LM64 is effectively an LM63 with GPIO lines. The driver does not
support these GPIO lines at present.

92
drivers/hwmon/lm63.c
View File

@ -61,6 +61,7 @@ static const unsigned short normal_i2c[] = { 0x18, 0x4c, 0x4e, I2C_CLIENT_END };
*/
#define LM63_REG_CONFIG1 0x03
#define LM63_REG_CONVRATE 0x04
#define LM63_REG_CONFIG2 0xBF
#define LM63_REG_CONFIG_FAN 0x4A
@ -96,6 +97,11 @@ static const unsigned short normal_i2c[] = { 0x18, 0x4c, 0x4e, I2C_CLIENT_END };
#define LM96163_REG_REMOTE_TEMP_U_LSB 0x32
#define LM96163_REG_CONFIG_ENHANCED 0x45
#define LM63_MAX_CONVRATE 9
#define LM63_MAX_CONVRATE_HZ 32
#define LM96163_MAX_CONVRATE_HZ 26
/*
* Conversions and various macros
* For tachometer counts, the LM63 uses 16-bit values.
@ -132,6 +138,9 @@ static const unsigned short normal_i2c[] = { 0x18, 0x4c, 0x4e, I2C_CLIENT_END };
(val) >= 127000 ? 127 : \
((val) + 500) / 1000)
#define UPDATE_INTERVAL(max, rate) \
((1000 << (LM63_MAX_CONVRATE - (rate))) / (max))
/*
* Functions declaration
*/
@ -180,9 +189,12 @@ struct lm63_data {
struct mutex update_lock;
char valid; /* zero until following fields are valid */
unsigned long last_updated; /* in jiffies */
int kind;
enum chips kind;
int temp2_offset;
int update_interval; /* in milliseconds */
int max_convrate_hz;
/* registers values */
u8 config, config_fan;
u16 fan[2]; /* 0: input
@ -449,6 +461,58 @@ static ssize_t set_temp2_crit_hyst(struct device *dev,
return count;
}
/*
* Set conversion rate.
* client->update_lock must be held when calling this function.
*/
static void lm63_set_convrate(struct i2c_client *client, struct lm63_data *data,
unsigned int interval)
{
int i;
unsigned int update_interval;
/* Shift calculations to avoid rounding errors */
interval <<= 6;
/* find the nearest update rate */
update_interval = (1 << (LM63_MAX_CONVRATE + 6)) * 1000
/ data->max_convrate_hz;
for (i = 0; i < LM63_MAX_CONVRATE; i++, update_interval >>= 1)
if (interval >= update_interval * 3 / 4)
break;
i2c_smbus_write_byte_data(client, LM63_REG_CONVRATE, i);
data->update_interval = UPDATE_INTERVAL(data->max_convrate_hz, i);
}
static ssize_t show_update_interval(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct lm63_data *data = dev_get_drvdata(dev);
return sprintf(buf, "%u\n", data->update_interval);
}
static ssize_t set_update_interval(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct i2c_client *client = to_i2c_client(dev);
struct lm63_data *data = i2c_get_clientdata(client);
unsigned long val;
int err;
err = kstrtoul(buf, 10, &val);
if (err)
return err;
mutex_lock(&data->update_lock);
lm63_set_convrate(client, data, SENSORS_LIMIT(val, 0, 100000));
mutex_unlock(&data->update_lock);
return count;
}
static ssize_t show_alarms(struct device *dev, struct device_attribute *dummy,
char *buf)
{
@ -499,6 +563,9 @@ static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 6);
/* Raw alarm file for compatibility */
static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
static DEVICE_ATTR(update_interval, S_IRUGO | S_IWUSR, show_update_interval,
set_update_interval);
static struct attribute *lm63_attributes[] = {
&dev_attr_pwm1.attr,
&dev_attr_pwm1_enable.attr,
@ -517,6 +584,7 @@ static struct attribute *lm63_attributes[] = {
&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
&dev_attr_alarms.attr,
&dev_attr_update_interval.attr,
NULL
};
@ -669,6 +737,7 @@ exit:
static void lm63_init_client(struct i2c_client *client)
{
struct lm63_data *data = i2c_get_clientdata(client);
u8 convrate;
data->config = i2c_smbus_read_byte_data(client, LM63_REG_CONFIG1);
data->config_fan = i2c_smbus_read_byte_data(client,
@ -687,6 +756,21 @@ static void lm63_init_client(struct i2c_client *client)
if (data->pwm1_freq == 0)
data->pwm1_freq = 1;
switch (data->kind) {
case lm63:
case lm64:
data->max_convrate_hz = LM63_MAX_CONVRATE_HZ;
break;
case lm96163:
data->max_convrate_hz = LM96163_MAX_CONVRATE_HZ;
break;
}
convrate = i2c_smbus_read_byte_data(client, LM63_REG_CONVRATE);
if (unlikely(convrate > LM63_MAX_CONVRATE))
convrate = LM63_MAX_CONVRATE;
data->update_interval = UPDATE_INTERVAL(data->max_convrate_hz,
convrate);
/*
* For LM96163, check if high resolution PWM
* and unsigned temperature format is enabled.
@ -730,10 +814,14 @@ static struct lm63_data *lm63_update_device(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct lm63_data *data = i2c_get_clientdata(client);
unsigned long next_update;
mutex_lock(&data->update_lock);
if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
next_update = data->last_updated
+ msecs_to_jiffies(data->update_interval) + 1;
if (time_after(jiffies, next_update) || !data->valid) {
if (data->config & 0x04) { /* tachometer enabled */
/* order matters for fan1_input */
data->fan[0] = i2c_smbus_read_byte_data(client,