forked from Minki/linux
Merge branch 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging
Pull hwmon update from Jean Delvare: "Only lm75 driver updates this time" * 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging: hwmon: (lm75) Add support for the Dallas/Maxim DS7505 hwmon: (lm75) Tune resolution and sample time per chip hwmon: (lm75) Prepare to support per-chip resolution and sample time hwmon: (lm75) Per-chip configuration register initialization
This commit is contained in:
Linus Torvalds
commit
e72a5d1ceb
@ -12,11 +12,11 @@ Supported chips:
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Addresses scanned: I2C 0x48 - 0x4f
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Datasheet: Publicly available at the National Semiconductor website
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http://www.national.com/
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* Dallas Semiconductor DS75, DS1775
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Prefixes: 'ds75', 'ds1775'
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* Dallas Semiconductor (now Maxim) DS75, DS1775, DS7505
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Prefixes: 'ds75', 'ds1775', 'ds7505'
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Addresses scanned: none
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Datasheet: Publicly available at the Dallas Semiconductor website
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http://www.maxim-ic.com/
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Datasheet: Publicly available at the Maxim website
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http://www.maximintegrated.com/
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* Maxim MAX6625, MAX6626
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Prefixes: 'max6625', 'max6626'
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Addresses scanned: none
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@ -67,7 +67,8 @@ the temperature falls below the Hysteresis value.
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All temperatures are in degrees Celsius, and are guaranteed within a
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range of -55 to +125 degrees.
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The LM75 only updates its values each 1.5 seconds; reading it more often
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The driver caches the values for a period varying between 1 second for the
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slowest chips and 125 ms for the fastest chips; reading it more often
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will do no harm, but will return 'old' values.
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The original LM75 was typically used in combination with LM78-like chips
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@ -78,8 +79,8 @@ The LM75 is essentially an industry standard; there may be other
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LM75 clones not listed here, with or without various enhancements,
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that are supported. The clones are not detected by the driver, unless
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they reproduce the exact register tricks of the original LM75, and must
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therefore be instantiated explicitly. The specific enhancements (such as
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higher resolution) are not currently supported by the driver.
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therefore be instantiated explicitly. Higher resolution up to 12-bit
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is supported by this driver, other specific enhancements are not.
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The LM77 is not supported, contrary to what we pretended for a long time.
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Both chips are simply not compatible, value encoding differs.
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@ -630,7 +630,7 @@ config SENSORS_LM75
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temperature sensor chip, with models including:
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- Analog Devices ADT75
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- Dallas Semiconductor DS75 and DS1775
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- Dallas Semiconductor DS75, DS1775 and DS7505
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- Maxim MAX6625 and MAX6626
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- Microchip MCP980x
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- National Semiconductor LM75, LM75A
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@ -38,6 +38,7 @@ enum lm75_type { /* keep sorted in alphabetical order */
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adt75,
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ds1775,
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ds75,
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ds7505,
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lm75,
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lm75a,
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max6625,
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@ -71,9 +72,12 @@ struct lm75_data {
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struct device *hwmon_dev;
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struct mutex update_lock;
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u8 orig_conf;
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u8 resolution; /* In bits, between 9 and 12 */
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u8 resolution_limits;
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char valid; /* !=0 if registers are valid */
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unsigned long last_updated; /* In jiffies */
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u16 temp[3]; /* Register values,
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unsigned long sample_time; /* In jiffies */
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s16 temp[3]; /* Register values,
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0 = input
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1 = max
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2 = hyst */
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@ -93,12 +97,15 @@ static ssize_t show_temp(struct device *dev, struct device_attribute *da,
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
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struct lm75_data *data = lm75_update_device(dev);
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long temp;
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if (IS_ERR(data))
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return PTR_ERR(data);
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return sprintf(buf, "%d\n",
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LM75_TEMP_FROM_REG(data->temp[attr->index]));
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temp = ((data->temp[attr->index] >> (16 - data->resolution)) * 1000)
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>> (data->resolution - 8);
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return sprintf(buf, "%ld\n", temp);
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}
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static ssize_t set_temp(struct device *dev, struct device_attribute *da,
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@ -110,13 +117,25 @@ static ssize_t set_temp(struct device *dev, struct device_attribute *da,
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int nr = attr->index;
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long temp;
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int error;
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u8 resolution;
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error = kstrtol(buf, 10, &temp);
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if (error)
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return error;
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/*
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* Resolution of limit registers is assumed to be the same as the
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* temperature input register resolution unless given explicitly.
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*/
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if (attr->index && data->resolution_limits)
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resolution = data->resolution_limits;
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else
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resolution = data->resolution;
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mutex_lock(&data->update_lock);
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data->temp[nr] = LM75_TEMP_TO_REG(temp);
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temp = clamp_val(temp, LM75_TEMP_MIN, LM75_TEMP_MAX);
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data->temp[nr] = DIV_ROUND_CLOSEST(temp << (resolution - 8),
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1000) << (16 - resolution);
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lm75_write_value(client, LM75_REG_TEMP[nr], data->temp[nr]);
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mutex_unlock(&data->update_lock);
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return count;
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@ -151,6 +170,7 @@ lm75_probe(struct i2c_client *client, const struct i2c_device_id *id)
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int status;
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u8 set_mask, clr_mask;
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int new;
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enum lm75_type kind = id->driver_data;
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if (!i2c_check_functionality(client->adapter,
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I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA))
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@ -167,8 +187,65 @@ lm75_probe(struct i2c_client *client, const struct i2c_device_id *id)
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* Then tweak to be more precise when appropriate.
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*/
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set_mask = 0;
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clr_mask = (1 << 0) /* continuous conversions */
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| (1 << 6) | (1 << 5); /* 9-bit mode */
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clr_mask = LM75_SHUTDOWN; /* continuous conversions */
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switch (kind) {
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case adt75:
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clr_mask |= 1 << 5; /* not one-shot mode */
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data->resolution = 12;
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data->sample_time = HZ / 8;
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break;
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case ds1775:
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case ds75:
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case stds75:
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clr_mask |= 3 << 5;
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set_mask |= 2 << 5; /* 11-bit mode */
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data->resolution = 11;
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data->sample_time = HZ;
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break;
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case ds7505:
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set_mask |= 3 << 5; /* 12-bit mode */
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data->resolution = 12;
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data->sample_time = HZ / 4;
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break;
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case lm75:
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case lm75a:
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data->resolution = 9;
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data->sample_time = HZ / 2;
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break;
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case max6625:
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data->resolution = 9;
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data->sample_time = HZ / 4;
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break;
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case max6626:
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data->resolution = 12;
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data->resolution_limits = 9;
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data->sample_time = HZ / 4;
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break;
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case tcn75:
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data->resolution = 9;
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data->sample_time = HZ / 8;
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break;
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case mcp980x:
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data->resolution_limits = 9;
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/* fall through */
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case tmp100:
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case tmp101:
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set_mask |= 3 << 5; /* 12-bit mode */
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data->resolution = 12;
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data->sample_time = HZ;
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clr_mask |= 1 << 7; /* not one-shot mode */
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break;
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case tmp105:
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case tmp175:
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case tmp275:
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case tmp75:
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set_mask |= 3 << 5; /* 12-bit mode */
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clr_mask |= 1 << 7; /* not one-shot mode */
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data->resolution = 12;
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data->sample_time = HZ / 2;
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break;
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}
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/* configure as specified */
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status = lm75_read_value(client, LM75_REG_CONF);
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@ -218,6 +295,7 @@ static const struct i2c_device_id lm75_ids[] = {
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{ "adt75", adt75, },
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{ "ds1775", ds1775, },
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{ "ds75", ds75, },
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{ "ds7505", ds7505, },
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{ "lm75", lm75, },
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{ "lm75a", lm75a, },
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{ "max6625", max6625, },
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@ -407,7 +485,7 @@ static struct lm75_data *lm75_update_device(struct device *dev)
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mutex_lock(&data->update_lock);
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if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
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if (time_after(jiffies, data->last_updated + data->sample_time)
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|| !data->valid) {
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int i;
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dev_dbg(&client->dev, "Starting lm75 update\n");
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