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DJoystick: Add a new ioctl to get the support joystick discrete signals

This commit is contained in:
Gregory Nutt 2014-11-28 15:39:57 -06:00
parent 27226eba0e
commit 544322edb9
2 changed files with 43 additions and 3 deletions
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24
drivers/input/djoystick.c
View File

@ -584,6 +584,7 @@ static int djoy_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
FAR struct inode *inode;
FAR struct djoy_upperhalf_s *priv;
FAR struct djoy_open_s *opriv;
FAR const struct djoy_lowerhalf_s *lower;
int ret;
DEBUGASSERT(filep && filep->f_priv && filep->f_inode);
@ -606,6 +607,29 @@ static int djoy_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
ret = -EINVAL;
switch (cmd)
{
/* Command: DJOYIOC_SUPPORTED
* Description: Report the set of button events supported by the hardware;
* Argument: A pointer to writeable integer value in which to return the
* set of supported buttons.
* Return: Zero (OK) on success. Minus one will be returned on failure
* with the errno value set appropriately.
*/
case DJOYIOC_SUPPORTED:
{
FAR int *supported = (FAR int *)((uintptr_t)arg);
if (supported)
{
lower = priv->du_lower;
DEBUGASSERT(lower && lower->dl_supported);
*supported = (int)lower->dl_supported(lower);
ret = OK;
}
}
break;
#ifndef CONFIG_DISABLE_POLL
/* Command: DJOYIOC_POLLEVENTS
* Description: Specify the set of button events that can cause a poll()

22
include/nuttx/input/djoystick.h
View File

@ -80,6 +80,7 @@
#define DJOY_BUTTON_2 (5) /* Bit 5: Button 2 */
#define DJOY_BUTTON_3 (6) /* Bit 6: Button 3 */
#define DJOY_BUTTON_4 (7) /* Bit 7: Button 4 */
#define DJOY_NDISCRETES (8) /* Total number of discrete signals */
#define DJOY_UP_BIT (1 << DJOY_UP) /* 1:Joystick UP selected */
#define DJOY_DOWN_BIT (1 << DJOY_DOWN) /* 1:Joystick DOWN selected */
@ -112,12 +113,27 @@
*
* 1) The read() method will always return a single value of size
* djoy_buttonset_t represent the current state of the joystick buttons.
* read() never blocks.
* 2) The poll() method can be used to notify a client if there is a change
* in any of the joystick discrete inputs. This feature, of course,
* depends upon interrupt GPIO support from the platform.
* depends upon interrupt GPIO support from the platform. NOTE: that
* semantics of poll() for POLLIN are atypical: The successful poll
* means that the data has changed and has nothing to with the
* availability of data to be read; data is always available to be
* read.
* 3) The ioctl() method supports the commands documented below:
*/
/* Command: DJOYIOC_SUPPORTED
* Description: Report the set of button events supported by the hardware;
* Argument: A pointer to writeable integer value in which to return the
* set of supported buttons.
* Return: Zero (OK) on success. Minus one will be returned on failure
* with the errno value set appropriately.
*/
#define DJOYIOC_SUPPORTED _DJOYIOC(0x0001)
/* Command: DJOYIOC_POLLEVENTS
* Description: Specify the set of button events that can cause a poll()
* to awaken. The default is all button depressions and all
@ -127,7 +143,7 @@
* with the errno value set appropriately.
*/
#define DJOYIOC_POLLEVENTS _DJOYIOC(0x0001)
#define DJOYIOC_POLLEVENTS _DJOYIOC(0x0002)
/* Command: DJOYIOC_REGISTER
* Description: Register to receive a signal whenever there is a change in
@ -139,7 +155,7 @@
* with the errno value set appropriately.
*/
#define DJOYIOC_REGISTER _DJOYIOC(0x0002)
#define DJOYIOC_REGISTER _DJOYIOC(0x0003)
/****************************************************************************
* Public Types