diff options
Diffstat (limited to 'drivers/dahdi/voicebus/voicebus.c')
| -rw-r--r-- | drivers/dahdi/voicebus/voicebus.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/dahdi/voicebus/voicebus.c b/drivers/dahdi/voicebus/voicebus.c index 241d4a9..c98b64f 100644 --- a/drivers/dahdi/voicebus/voicebus.c +++ b/drivers/dahdi/voicebus/voicebus.c @@ -1154,6 +1154,26 @@ void voicebus_stop(struct voicebus *vb) } EXPORT_SYMBOL(voicebus_stop); +/** + * voicebus_quiesce - Halt the voicebus interface. + * @vb: The voicebus structure to quiet + * + * This ensures that the device is not engaged in any DMA transactions or + * interrupting. It does not grab any locks since it may be called by a dying + * kernel. + */ +void voicebus_quiesce(struct voicebus *vb) +{ + if (!vb) + return; + + /* Reset the device */ + __vb_disable_interrupts(vb); + __vb_setctl(vb, 0x0000, 0x1); + __vb_getctl(vb, 0x0000); +} +EXPORT_SYMBOL(voicebus_quiesce); + /*! * \brief Prepare the interface for module unload. * |