Query() - Device Driver

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Last updated: Mar 13, 2014 by Former user (Deleted)
1 min read
static  void  FSDev_####_Query (FS_DEV       *p_dev,
                                FS_DEV_INFO  *p_info,
                                FS_ERR       *p_err);

File

Called from

Code enabled by

fs_dev_####.c

FSDev_Open(),

FSDev_Refresh(),

FSDev_QueryLocked()

 

N/A

The device driver Query() function gets information about a device.

Arguments

p_dev

Pointer to device to query.

p_info

Pointer to structure that will receive device information.

p_err

Pointer to variable that will receive the return error code from this function

FS_ERR_NONE

Device information obtained.

FS_ERR_DEV_INVALID_UNIT_NBR

Device unit number is invalid.

FS_ERR_DEV_NOT_OPEN

Device is not open.

FS_ERR_DEV_NOT_PRESENT

Device is not present.

Returned Value

None.

Notes/Warnings

  1. Tracking whether a device is open is not necessary, because this should ONLY be called when a device is open.
  2. The device driver Query() function is called while the caller holds the device lock.

For more information about the FS_DEV_INFO structure, see FS_DEV_INFO.