On Fri, 05 Feb 2016 07:17:06 +0100, Sudip Mukherjee wrote:
On Thu, Feb 04, 2016 at 05:51:07PM +0100, Takashi Iwai wrote:
On Thu, 04 Feb 2016 17:38:23 +0100, Sudip Mukherjee wrote:
Modify portman driver to use the new parallel port device model. The advantage of using the device model is that the device gets binded to the hardware, we get the feature of hotplug, we can bind/unbind the driver at runtime. The only change is in the way the driver gets registered with the parallel port subsystem and so as a result there is no user visible change or any chance of regression.
Signed-off-by: Sudip Mukherjee sudip@vectorindia.org
v3: changed commit message v2:
- pardev_cb is initialized while declaring, thus removing the use of
memset. 2. used pdev->id. 3. v1 did not have the parport probe callback, but we will need the probe callback for binding as the name of the driver and the name of the device is different. 4. in v1 I missed modifying snd_portman_probe_port().
sound/drivers/portman2x4.c | 53 ++++++++++++++++++++++++++++++++++------------ 1 file changed, 39 insertions(+), 14 deletions(-)
diff --git a/sound/drivers/portman2x4.c b/sound/drivers/portman2x4.c index 172685d..a22f56c 100644 --- a/sound/drivers/portman2x4.c +++ b/sound/drivers/portman2x4.c @@ -650,10 +650,21 @@ static int snd_portman_probe_port(struct parport *p) { struct pardevice *pardev; int res;
- pardev = parport_register_device(p, DRIVER_NAME,
NULL, NULL, NULL,0, NULL);
- struct pardev_cb pdev_cb = {
.preempt = NULL,.wakeup = NULL,.private = NULL,.irq_func = NULL,.flags = 0,- };
- /*
* Specify the device number as SNDRV_CARDS + 1 so that the* device id alloted to this temporary device will never clash* with an actual device already registered.*/- pardev = parport_register_dev_model(p, DRIVER_NAME, &pdev_cb,
SNDRV_CARDS + 1);Hmm, doesn't this result in a device name like "xxx.33" ?
yes, it will. But this is a temoporary device just to check if the sound card is connected to that particular parallel port or not. After checking this device is immediately unregistered. My idea here was to have a device number which will never clash with another device number. And we can never have a device like "xxx.33", so no conflict. :)
Ah, this is the temporary one. If so, does it make sense to convert this to dev_model one? This means that the device will be notified to udev even though this is a temporary one to be removed immediately. It's what we'd want to avoid. The function serves just as probing the availability of the given port, not really registering anything there.
That is, we need to change the registration flow itself if we really want to move dev_model for the whole.
thanks,
Takashi