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author | Chris Packham <chris.packham@alliedtelesis.co.nz> | 2020-09-24 20:51:01 +1200 |
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committer | Guenter Roeck <linux@roeck-us.net> | 2020-09-24 07:41:47 -0700 |
commit | 6a8cdd146459a4f48d2932908b608cf44f18970e (patch) | |
tree | 7fa42f5628867b641bee5b6891166840f50217a3 /drivers/hwmon/adm9240.c | |
parent | 10d097737dfe27bb0bf3f825b5ff28d26053a8c6 (diff) | |
download | linux-6a8cdd146459a4f48d2932908b608cf44f18970e.tar.gz linux-6a8cdd146459a4f48d2932908b608cf44f18970e.tar.bz2 linux-6a8cdd146459a4f48d2932908b608cf44f18970e.zip |
hwmon: (adm9240) Create functions for updating measure and config
Split the body of adm9240_update_device() into two helper functions
adm9240_update_measure() and adm9240_update_config(). Although neither
of the new helpers returns an error yet lay the groundwork for
propagating failures through to the sysfs readers.
Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Link: https://lore.kernel.org/r/20200924085102.15219-3-chris.packham@alliedtelesis.co.nz
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'drivers/hwmon/adm9240.c')
-rw-r--r-- | drivers/hwmon/adm9240.c | 202 |
1 files changed, 138 insertions, 64 deletions
diff --git a/drivers/hwmon/adm9240.c b/drivers/hwmon/adm9240.c index a34a8c9235b8..94b03eab832e 100644 --- a/drivers/hwmon/adm9240.c +++ b/drivers/hwmon/adm9240.c @@ -158,53 +158,100 @@ static void adm9240_write_fan_div(struct i2c_client *client, int nr, nr + 1, 1 << old, 1 << fan_div); } -static struct adm9240_data *adm9240_update_device(struct device *dev) +static int adm9240_update_measure(struct adm9240_data *data) { - struct adm9240_data *data = dev_get_drvdata(dev); struct i2c_client *client = data->client; int i; + for (i = 0; i < 6; i++) { /* read voltages */ + data->in[i] = i2c_smbus_read_byte_data(client, + ADM9240_REG_IN(i)); + } + data->alarms = i2c_smbus_read_byte_data(client, + ADM9240_REG_INT(0)) | + i2c_smbus_read_byte_data(client, + ADM9240_REG_INT(1)) << 8; + + /* + * read temperature: assume temperature changes less than + * 0.5'C per two measurement cycles thus ignore possible + * but unlikely aliasing error on lsb reading. --Grant + */ + data->temp = (i2c_smbus_read_byte_data(client, + ADM9240_REG_TEMP) << 8) | + i2c_smbus_read_byte_data(client, + ADM9240_REG_TEMP_CONF); + + for (i = 0; i < 2; i++) { /* read fans */ + data->fan[i] = i2c_smbus_read_byte_data(client, + ADM9240_REG_FAN(i)); + + /* adjust fan clock divider on overflow */ + if (data->valid && data->fan[i] == 255 && + data->fan_div[i] < 3) { + + adm9240_write_fan_div(client, i, + ++data->fan_div[i]); + + /* adjust fan_min if active, but not to 0 */ + if (data->fan_min[i] < 255 && + data->fan_min[i] >= 2) + data->fan_min[i] /= 2; + } + } + + return 0; +} + +static int adm9240_update_config(struct adm9240_data *data) +{ + struct i2c_client *client = data->client; + int i; + + for (i = 0; i < 6; i++) { + data->in_min[i] = i2c_smbus_read_byte_data(client, + ADM9240_REG_IN_MIN(i)); + data->in_max[i] = i2c_smbus_read_byte_data(client, + ADM9240_REG_IN_MAX(i)); + } + for (i = 0; i < 2; i++) { + data->fan_min[i] = i2c_smbus_read_byte_data(client, + ADM9240_REG_FAN_MIN(i)); + } + for (i = 0; i < 2; i++) { + data->temp_max[i] = i2c_smbus_read_byte_data(client, + ADM9240_REG_TEMP_MAX(i)); + } + + /* read fan divs and 5-bit VID */ + i = i2c_smbus_read_byte_data(client, ADM9240_REG_VID_FAN_DIV); + data->fan_div[0] = (i >> 4) & 3; + data->fan_div[1] = (i >> 6) & 3; + data->vid = i & 0x0f; + data->vid |= (i2c_smbus_read_byte_data(client, + ADM9240_REG_VID4) & 1) << 4; + /* read analog out */ + data->aout = i2c_smbus_read_byte_data(client, + ADM9240_REG_ANALOG_OUT); + + return 0; +} + +static struct adm9240_data *adm9240_update_device(struct device *dev) +{ + struct adm9240_data *data = dev_get_drvdata(dev); + int err; + mutex_lock(&data->update_lock); /* minimum measurement cycle: 1.75 seconds */ if (time_after(jiffies, data->last_updated_measure + (HZ * 7 / 4)) || !data->valid) { - - for (i = 0; i < 6; i++) { /* read voltages */ - data->in[i] = i2c_smbus_read_byte_data(client, - ADM9240_REG_IN(i)); - } - data->alarms = i2c_smbus_read_byte_data(client, - ADM9240_REG_INT(0)) | - i2c_smbus_read_byte_data(client, - ADM9240_REG_INT(1)) << 8; - - /* - * read temperature: assume temperature changes less than - * 0.5'C per two measurement cycles thus ignore possible - * but unlikely aliasing error on lsb reading. --Grant - */ - data->temp = (i2c_smbus_read_byte_data(client, - ADM9240_REG_TEMP) << 8) | - i2c_smbus_read_byte_data(client, - ADM9240_REG_TEMP_CONF); - - for (i = 0; i < 2; i++) { /* read fans */ - data->fan[i] = i2c_smbus_read_byte_data(client, - ADM9240_REG_FAN(i)); - - /* adjust fan clock divider on overflow */ - if (data->valid && data->fan[i] == 255 && - data->fan_div[i] < 3) { - - adm9240_write_fan_div(client, i, - ++data->fan_div[i]); - - /* adjust fan_min if active, but not to 0 */ - if (data->fan_min[i] < 255 && - data->fan_min[i] >= 2) - data->fan_min[i] /= 2; - } + err = adm9240_update_measure(data); + if (err < 0) { + data->valid = 0; + mutex_unlock(&data->update_lock); + return ERR_PTR(err); } data->last_updated_measure = jiffies; } @@ -212,33 +259,12 @@ static struct adm9240_data *adm9240_update_device(struct device *dev) /* minimum config reading cycle: 300 seconds */ if (time_after(jiffies, data->last_updated_config + (HZ * 300)) || !data->valid) { - - for (i = 0; i < 6; i++) { - data->in_min[i] = i2c_smbus_read_byte_data(client, - ADM9240_REG_IN_MIN(i)); - data->in_max[i] = i2c_smbus_read_byte_data(client, - ADM9240_REG_IN_MAX(i)); + err = adm9240_update_config(data); + if (err < 0) { + data->valid = 0; + mutex_unlock(&data->update_lock); + return ERR_PTR(err); } - for (i = 0; i < 2; i++) { - data->fan_min[i] = i2c_smbus_read_byte_data(client, - ADM9240_REG_FAN_MIN(i)); - } - for (i = 0; i < 2; i++) { - data->temp_max[i] = i2c_smbus_read_byte_data(client, - ADM9240_REG_TEMP_MAX(i)); - } - - /* read fan divs and 5-bit VID */ - i = i2c_smbus_read_byte_data(client, ADM9240_REG_VID_FAN_DIV); - data->fan_div[0] = (i >> 4) & 3; - data->fan_div[1] = (i >> 6) & 3; - data->vid = i & 0x0f; - data->vid |= (i2c_smbus_read_byte_data(client, - ADM9240_REG_VID4) & 1) << 4; - /* read analog out */ - data->aout = i2c_smbus_read_byte_data(client, - ADM9240_REG_ANALOG_OUT); - data->last_updated_config = jiffies; data->valid = 1; } @@ -253,6 +279,10 @@ static ssize_t temp1_input_show(struct device *dev, struct device_attribute *dummy, char *buf) { struct adm9240_data *data = adm9240_update_device(dev); + + if (IS_ERR(data)) + return PTR_ERR(data); + return sprintf(buf, "%d\n", data->temp / 128 * 500); /* 9-bit value */ } @@ -261,6 +291,10 @@ static ssize_t max_show(struct device *dev, struct device_attribute *devattr, { struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); struct adm9240_data *data = adm9240_update_device(dev); + + if (IS_ERR(data)) + return PTR_ERR(data); + return sprintf(buf, "%d\n", data->temp_max[attr->index] * 1000); } @@ -295,6 +329,10 @@ static ssize_t in_show(struct device *dev, struct device_attribute *devattr, { struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); struct adm9240_data *data = adm9240_update_device(dev); + + if (IS_ERR(data)) + return PTR_ERR(data); + return sprintf(buf, "%d\n", IN_FROM_REG(data->in[attr->index], attr->index)); } @@ -304,6 +342,10 @@ static ssize_t in_min_show(struct device *dev, { struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); struct adm9240_data *data = adm9240_update_device(dev); + + if (IS_ERR(data)) + return PTR_ERR(data); + return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[attr->index], attr->index)); } @@ -313,6 +355,10 @@ static ssize_t in_max_show(struct device *dev, { struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); struct adm9240_data *data = adm9240_update_device(dev); + + if (IS_ERR(data)) + return PTR_ERR(data); + return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[attr->index], attr->index)); } @@ -386,6 +432,10 @@ static ssize_t fan_show(struct device *dev, struct device_attribute *devattr, { struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); struct adm9240_data *data = adm9240_update_device(dev); + + if (IS_ERR(data)) + return PTR_ERR(data); + return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[attr->index], 1 << data->fan_div[attr->index])); } @@ -395,6 +445,10 @@ static ssize_t fan_min_show(struct device *dev, { struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); struct adm9240_data *data = adm9240_update_device(dev); + + if (IS_ERR(data)) + return PTR_ERR(data); + return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[attr->index], 1 << data->fan_div[attr->index])); } @@ -404,6 +458,10 @@ static ssize_t fan_div_show(struct device *dev, { struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); struct adm9240_data *data = adm9240_update_device(dev); + + if (IS_ERR(data)) + return PTR_ERR(data); + return sprintf(buf, "%d\n", 1 << data->fan_div[attr->index]); } @@ -490,6 +548,10 @@ static ssize_t alarms_show(struct device *dev, struct device_attribute *attr, char *buf) { struct adm9240_data *data = adm9240_update_device(dev); + + if (IS_ERR(data)) + return PTR_ERR(data); + return sprintf(buf, "%u\n", data->alarms); } static DEVICE_ATTR_RO(alarms); @@ -499,6 +561,10 @@ static ssize_t alarm_show(struct device *dev, struct device_attribute *attr, { int bitnr = to_sensor_dev_attr(attr)->index; struct adm9240_data *data = adm9240_update_device(dev); + + if (IS_ERR(data)) + return PTR_ERR(data); + return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1); } static SENSOR_DEVICE_ATTR_RO(in0_alarm, alarm, 0); @@ -516,6 +582,10 @@ static ssize_t cpu0_vid_show(struct device *dev, struct device_attribute *attr, char *buf) { struct adm9240_data *data = adm9240_update_device(dev); + + if (IS_ERR(data)) + return PTR_ERR(data); + return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm)); } static DEVICE_ATTR_RO(cpu0_vid); @@ -525,6 +595,10 @@ static ssize_t aout_output_show(struct device *dev, struct device_attribute *attr, char *buf) { struct adm9240_data *data = adm9240_update_device(dev); + + if (IS_ERR(data)) + return PTR_ERR(data); + return sprintf(buf, "%d\n", AOUT_FROM_REG(data->aout)); } |