#include <linux/mutex.h>
#include <linux/delay.h>
#include <linux/log2.h>
+#include <linux/kthread.h>
/* Addresses to scan */
static const unsigned short normal_i2c[] = { 0x2C, 0x2E, 0x2F, I2C_CLIENT_END };
#define ADT7470_REG_PWM12_CFG 0x68
#define ADT7470_PWM2_AUTO_MASK 0x40
#define ADT7470_PWM1_AUTO_MASK 0x80
+#define ADT7470_PWM_AUTO_MASK 0xC0
#define ADT7470_REG_PWM34_CFG 0x69
#define ADT7470_PWM3_AUTO_MASK 0x40
#define ADT7470_PWM4_AUTO_MASK 0x80
/* How often do we reread sensor limit values? (In jiffies) */
#define LIMIT_REFRESH_INTERVAL (60 * HZ)
-/* sleep 1s while gathering temperature data */
-#define TEMP_COLLECTION_TIME 1000
+/* Wait at least 200ms per sensor for 10 sensors */
+#define TEMP_COLLECTION_TIME 2000
+
+/* auto update thing won't fire more than every 2s */
+#define AUTO_UPDATE_INTERVAL 2000
/* datasheet says to divide this number by the fan reading to get fan rpm */
#define FAN_PERIOD_TO_RPM(x) ((90000 * 60) / (x))
unsigned long sensors_last_updated; /* In jiffies */
unsigned long limits_last_updated; /* In jiffies */
+ int num_temp_sensors; /* -1 = probe */
+ int temperatures_probed;
+
s8 temp[ADT7470_TEMP_COUNT];
s8 temp_min[ADT7470_TEMP_COUNT];
s8 temp_max[ADT7470_TEMP_COUNT];
u8 pwm_min[ADT7470_PWM_COUNT];
s8 pwm_tmin[ADT7470_PWM_COUNT];
u8 pwm_auto_temp[ADT7470_PWM_COUNT];
+
+ struct task_struct *auto_update;
+ struct completion auto_update_stop;
+ unsigned int auto_update_interval;
};
static int adt7470_probe(struct i2c_client *client,
}
}
-static struct adt7470_data *adt7470_update_device(struct device *dev)
+/* Probe for temperature sensors. Assumes lock is held */
+static int adt7470_read_temperatures(struct i2c_client *client,
+ struct adt7470_data *data)
{
- struct i2c_client *client = to_i2c_client(dev);
- struct adt7470_data *data = i2c_get_clientdata(client);
- unsigned long local_jiffies = jiffies;
- u8 cfg;
+ unsigned long res;
int i;
+ u8 cfg, pwm[4], pwm_cfg[2];
- mutex_lock(&data->lock);
- if (time_before(local_jiffies, data->sensors_last_updated +
- SENSOR_REFRESH_INTERVAL)
- && data->sensors_valid)
- goto no_sensor_update;
+ /* save pwm[1-4] config register */
+ pwm_cfg[0] = i2c_smbus_read_byte_data(client, ADT7470_REG_PWM_CFG(0));
+ pwm_cfg[1] = i2c_smbus_read_byte_data(client, ADT7470_REG_PWM_CFG(2));
+
+ /* set manual pwm to whatever it is set to now */
+ for (i = 0; i < ADT7470_FAN_COUNT; i++)
+ pwm[i] = i2c_smbus_read_byte_data(client, ADT7470_REG_PWM(i));
+
+ /* put pwm in manual mode */
+ i2c_smbus_write_byte_data(client, ADT7470_REG_PWM_CFG(0),
+ pwm_cfg[0] & ~(ADT7470_PWM_AUTO_MASK));
+ i2c_smbus_write_byte_data(client, ADT7470_REG_PWM_CFG(2),
+ pwm_cfg[1] & ~(ADT7470_PWM_AUTO_MASK));
+
+ /* write pwm control to whatever it was */
+ for (i = 0; i < ADT7470_FAN_COUNT; i++)
+ i2c_smbus_write_byte_data(client, ADT7470_REG_PWM(i), pwm[i]);
/* start reading temperature sensors */
cfg = i2c_smbus_read_byte_data(client, ADT7470_REG_CFG);
cfg |= 0x80;
i2c_smbus_write_byte_data(client, ADT7470_REG_CFG, cfg);
- /*
- * Delay is 200ms * number of tmp05 sensors. Too bad
- * there's no way to figure out how many are connected.
- * For now, assume 1s will work.
- */
- msleep(TEMP_COLLECTION_TIME);
+ /* Delay is 200ms * number of temp sensors. */
+ res = msleep_interruptible((data->num_temp_sensors >= 0 ?
+ data->num_temp_sensors * 200 :
+ TEMP_COLLECTION_TIME));
/* done reading temperature sensors */
cfg = i2c_smbus_read_byte_data(client, ADT7470_REG_CFG);
cfg &= ~0x80;
i2c_smbus_write_byte_data(client, ADT7470_REG_CFG, cfg);
- for (i = 0; i < ADT7470_TEMP_COUNT; i++)
+ /* restore pwm[1-4] config registers */
+ i2c_smbus_write_byte_data(client, ADT7470_REG_PWM_CFG(0), pwm_cfg[0]);
+ i2c_smbus_write_byte_data(client, ADT7470_REG_PWM_CFG(2), pwm_cfg[1]);
+
+ if (res) {
+ printk(KERN_ERR "ha ha, interrupted");
+ return -EAGAIN;
+ }
+
+ /* Only count fans if we have to */
+ if (data->num_temp_sensors >= 0)
+ return 0;
+
+ for (i = 0; i < ADT7470_TEMP_COUNT; i++) {
data->temp[i] = i2c_smbus_read_byte_data(client,
ADT7470_TEMP_REG(i));
+ if (data->temp[i])
+ data->num_temp_sensors = i + 1;
+ }
+ data->temperatures_probed = 1;
+ return 0;
+}
+
+static int adt7470_update_thread(void *p)
+{
+ struct i2c_client *client = p;
+ struct adt7470_data *data = i2c_get_clientdata(client);
+
+ while (!kthread_should_stop()) {
+ mutex_lock(&data->lock);
+ adt7470_read_temperatures(client, data);
+ mutex_unlock(&data->lock);
+ if (kthread_should_stop())
+ break;
+ msleep_interruptible(data->auto_update_interval);
+ }
+
+ complete_all(&data->auto_update_stop);
+ return 0;
+}
+
+static struct adt7470_data *adt7470_update_device(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct adt7470_data *data = i2c_get_clientdata(client);
+ unsigned long local_jiffies = jiffies;
+ u8 cfg;
+ int i;
+ int need_sensors = 1;
+ int need_limits = 1;
+
+ /*
+ * Figure out if we need to update the shadow registers.
+ * Lockless means that we may occasionally report out of
+ * date data.
+ */
+ if (time_before(local_jiffies, data->sensors_last_updated +
+ SENSOR_REFRESH_INTERVAL) &&
+ data->sensors_valid)
+ need_sensors = 0;
+
+ if (time_before(local_jiffies, data->limits_last_updated +
+ LIMIT_REFRESH_INTERVAL) &&
+ data->limits_valid)
+ need_limits = 0;
+
+ if (!need_sensors && !need_limits)
+ return data;
+
+ mutex_lock(&data->lock);
+ if (!need_sensors)
+ goto no_sensor_update;
+
+ if (!data->temperatures_probed)
+ adt7470_read_temperatures(client, data);
+ else
+ for (i = 0; i < ADT7470_TEMP_COUNT; i++)
+ data->temp[i] = i2c_smbus_read_byte_data(client,
+ ADT7470_TEMP_REG(i));
for (i = 0; i < ADT7470_FAN_COUNT; i++)
data->fan[i] = adt7470_read_word_data(client,
data->sensors_valid = 1;
no_sensor_update:
- if (time_before(local_jiffies, data->limits_last_updated +
- LIMIT_REFRESH_INTERVAL)
- && data->limits_valid)
+ if (!need_limits)
goto out;
for (i = 0; i < ADT7470_TEMP_COUNT; i++) {
return data;
}
+static ssize_t show_auto_update_interval(struct device *dev,
+ struct device_attribute *devattr,
+ char *buf)
+{
+ struct adt7470_data *data = adt7470_update_device(dev);
+ return sprintf(buf, "%d\n", data->auto_update_interval);
+}
+
+static ssize_t set_auto_update_interval(struct device *dev,
+ struct device_attribute *devattr,
+ const char *buf,
+ size_t count)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct adt7470_data *data = i2c_get_clientdata(client);
+ long temp;
+
+ if (strict_strtol(buf, 10, &temp))
+ return -EINVAL;
+
+ temp = SENSORS_LIMIT(temp, 0, 60000);
+
+ mutex_lock(&data->lock);
+ data->auto_update_interval = temp;
+ mutex_unlock(&data->lock);
+
+ return count;
+}
+
+static ssize_t show_num_temp_sensors(struct device *dev,
+ struct device_attribute *devattr,
+ char *buf)
+{
+ struct adt7470_data *data = adt7470_update_device(dev);
+ return sprintf(buf, "%d\n", data->num_temp_sensors);
+}
+
+static ssize_t set_num_temp_sensors(struct device *dev,
+ struct device_attribute *devattr,
+ const char *buf,
+ size_t count)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct adt7470_data *data = i2c_get_clientdata(client);
+ long temp;
+
+ if (strict_strtol(buf, 10, &temp))
+ return -EINVAL;
+
+ temp = SENSORS_LIMIT(temp, -1, 10);
+
+ mutex_lock(&data->lock);
+ data->num_temp_sensors = temp;
+ if (temp < 0)
+ data->temperatures_probed = 0;
+ mutex_unlock(&data->lock);
+
+ return count;
+}
+
static ssize_t show_temp_min(struct device *dev,
struct device_attribute *devattr,
char *buf)
}
static DEVICE_ATTR(alarm_mask, S_IRUGO, show_alarm_mask, NULL);
+static DEVICE_ATTR(num_temp_sensors, S_IWUSR | S_IRUGO, show_num_temp_sensors,
+ set_num_temp_sensors);
+static DEVICE_ATTR(auto_update_interval, S_IWUSR | S_IRUGO,
+ show_auto_update_interval, set_auto_update_interval);
static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_max,
set_temp_max, 0);
static struct attribute *adt7470_attr[] =
{
&dev_attr_alarm_mask.attr,
+ &dev_attr_num_temp_sensors.attr,
+ &dev_attr_auto_update_interval.attr,
&sensor_dev_attr_temp1_max.dev_attr.attr,
&sensor_dev_attr_temp2_max.dev_attr.attr,
&sensor_dev_attr_temp3_max.dev_attr.attr,
goto exit;
}
+ data->num_temp_sensors = -1;
+ data->auto_update_interval = AUTO_UPDATE_INTERVAL;
+
i2c_set_clientdata(client, data);
mutex_init(&data->lock);
goto exit_remove;
}
+ init_completion(&data->auto_update_stop);
+ data->auto_update = kthread_run(adt7470_update_thread, client,
+ dev_name(data->hwmon_dev));
+ if (IS_ERR(data->auto_update))
+ goto exit_unregister;
+
return 0;
+exit_unregister:
+ hwmon_device_unregister(data->hwmon_dev);
exit_remove:
sysfs_remove_group(&client->dev.kobj, &data->attrs);
exit_free:
{
struct adt7470_data *data = i2c_get_clientdata(client);
+ kthread_stop(data->auto_update);
+ wait_for_completion(&data->auto_update_stop);
hwmon_device_unregister(data->hwmon_dev);
sysfs_remove_group(&client->dev.kobj, &data->attrs);
kfree(data);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff