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| author | Gregory Nutt <gnutt@nuttx.org> | 2014-11-28 15:39:57 -0600 |
|---|---|---|
| committer | Gregory Nutt <gnutt@nuttx.org> | 2014-11-28 15:39:57 -0600 |
| commit | 8f19ca38293a6615be3fd6b2ec43f59bc1892010 (patch) | |
| tree | 975ed38ef3369ac9054734e184435a5f049f34bb /nuttx/include/nuttx | |
| parent | 98bb52c4a4b7a48ac508adfb6206368166cc356b (diff) | |
| download | nuttx-8f19ca38293a6615be3fd6b2ec43f59bc1892010.tar.gz nuttx-8f19ca38293a6615be3fd6b2ec43f59bc1892010.tar.bz2 nuttx-8f19ca38293a6615be3fd6b2ec43f59bc1892010.zip | |
DJoystick: Add a new ioctl to get the support joystick discrete signals
Diffstat (limited to 'nuttx/include/nuttx')
| -rw-r--r-- | nuttx/include/nuttx/input/djoystick.h | 22 |
1 files changed, 19 insertions, 3 deletions
diff --git a/nuttx/include/nuttx/input/djoystick.h b/nuttx/include/nuttx/input/djoystick.h index 32f30eaeb..14ef508ce 100644 --- a/nuttx/include/nuttx/input/djoystick.h +++ b/nuttx/include/nuttx/input/djoystick.h @@ -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 |