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NFC: digital: Add a note about asynchronous functions

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This explains how and why the timeout parameter must be handled by the
driver implementation.

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Thierry Escande 2014-01-02 11:58:12 +01:00 committed by Samuel Ortiz
parent ea87a5efa9
commit 444fb98eed
1 changed files with 10 additions and 0 deletions
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10
include/net/nfc/digital.h
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@ -122,6 +122,16 @@ typedef void (*nfc_digital_cmd_complete_t)(struct nfc_digital_dev *ddev,
* switch_rf to turn the radio on. A call to in|tg_configure_hw must turn
* the device radio on.
* @abort_cmd: Discard the last sent command.
*
* Notes: Asynchronous functions have a timeout parameter. It is the driver
* responsibility to call the digital stack back through the
* nfc_digital_cmd_complete_t callback when no RF respsonse has been
* received within the specified time (in milliseconds). In that case the
* driver must set the resp sk_buff to ERR_PTR(-ETIMEDOUT).
* Since the digital stack serializes commands to be sent, it's mandatory
* for the driver to handle the timeout correctly. Otherwise the stack
* would not be able to send new commands, waiting for the reply of the
* current one.
*/
struct nfc_digital_ops {
int (*in_configure_hw)(struct nfc_digital_dev *ddev, int type,