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hwmon: (core) Clarify when read and write callbacks are mandatory

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The callback descrption in hwmon.h was misleading and stated that read and
write callbacks would be optional. More accurate is is that the callbacks
are mandatory if readable / writeable attributes are present.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Guenter Roeck 2016-11-20 02:55:45 -08:00
parent a2a0c3c57a
commit f680b28456
1 changed files with 2 additions and 4 deletions
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6
include/linux/hwmon.h
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@ -298,8 +298,7 @@ enum hwmon_pwm_attributes {
* Channel number * Channel number
* The function returns the file permissions. * The function returns the file permissions.
* If the return value is 0, no attribute will be created. * If the return value is 0, no attribute will be created.
* @read: Read callback. Optional. If not provided, attributes * @read: Read callback. Mandatory if readable attributes are present.
* will not be readable.
* Parameters are: * Parameters are:
* @dev: Pointer to hardware monitoring device * @dev: Pointer to hardware monitoring device
* @type: Sensor type * @type: Sensor type
@ -308,8 +307,7 @@ enum hwmon_pwm_attributes {
* Channel number * Channel number
* @val: Pointer to returned value * @val: Pointer to returned value
* The function returns 0 on success or a negative error number. * The function returns 0 on success or a negative error number.
* @write: Write callback. Optional. If not provided, attributes * @write: Write callback. Mandatory if writeable attributes are present.
* will not be writable.
* Parameters are: * Parameters are:
* @dev: Pointer to hardware monitoring device * @dev: Pointer to hardware monitoring device
* @type: Sensor type * @type: Sensor type