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driver/uinput: add uinput button support

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Signed-off-by: yinshengkai <yinshengkai@xiaomi.com>
This commit is contained in:
yinshengkai 2021-12-24 16:30:36 +08:00 committed by Xiang Xiao
parent 377c15955e
commit 3bb4e053fe
4 changed files with 201 additions and 2 deletions
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69
drivers/input/button_upper.c
View File

@ -129,6 +129,11 @@ static int btn_ioctl(FAR struct file *filep, int cmd,
static int btn_poll(FAR struct file *filep, FAR struct pollfd *fds,
bool setup);
#ifdef CONFIG_INPUT_UINPUT
static ssize_t btn_write(FAR struct file *filep, FAR const char *buffer,
size_t buflen);
#endif
/****************************************************************************
* Private Data
****************************************************************************/
@ -138,7 +143,11 @@ static const struct file_operations btn_fops =
btn_open, /* open */
btn_close, /* close */
btn_read, /* read */
#ifdef CONFIG_INPUT_UINPUT
btn_write, /* write */
#else
NULL, /* write */
#endif
NULL, /* seek */
btn_ioctl, /* ioctl */
btn_poll /* poll */
@ -508,7 +517,7 @@ static ssize_t btn_read(FAR struct file *filep, FAR char *buffer,
if (len < sizeof(btn_buttonset_t))
{
ierr("ERROR: buffer too small: %lu\n", (unsigned long)len);
ierr("ERROR: buffer too small: %zu\n", len);
return -EINVAL;
}
@ -531,6 +540,64 @@ static ssize_t btn_read(FAR struct file *filep, FAR char *buffer,
return (ssize_t)sizeof(btn_buttonset_t);
}
/****************************************************************************
* Name: btn_write
****************************************************************************/
#ifdef CONFIG_INPUT_UINPUT
static ssize_t btn_write(FAR struct file *filep, FAR const char *buffer,
size_t buflen)
{
FAR struct inode *inode;
FAR struct btn_upperhalf_s *priv;
FAR const struct btn_lowerhalf_s *lower;
int ret;
DEBUGASSERT(filep && filep->f_inode);
inode = filep->f_inode;
DEBUGASSERT(inode->i_private);
priv = (FAR struct btn_upperhalf_s *)inode->i_private;
/* Make sure that the buffer is sufficiently large to hold at least one
* complete sample.
*
* REVISIT: Should also check buffer alignment.
*/
if (buflen < sizeof(btn_buttonset_t))
{
ierr("ERROR: buffer too small: %zu\n", buflen);
return -EINVAL;
}
/* Get exclusive access to the driver structure */
ret = btn_takesem(&priv->bu_exclsem);
if (ret < 0)
{
ierr("ERROR: btn_takesem failed: %d\n", ret);
return ret;
}
/* Write the current state of the buttons */
lower = priv->bu_lower;
DEBUGASSERT(lower);
if (lower->bl_write)
{
ret = lower->bl_write(lower, buffer, buflen);
}
else
{
ret = -ENOSYS;
}
btn_givesem(&priv->bu_exclsem);
return (ssize_t)ret;
}
#endif
/****************************************************************************
* Name: btn_ioctl
****************************************************************************/

112
drivers/input/uinput.c
View File

@ -26,9 +26,10 @@
#include <errno.h>
#include <stdio.h>
#include <nuttx/kmalloc.h>
#include <nuttx/input/buttons.h>
#include <nuttx/input/touchscreen.h>
#include <nuttx/input/uinput.h>
#include <nuttx/kmalloc.h>
/****************************************************************************
* Pre-processor Definitions
@ -36,17 +37,50 @@
#define UINPUT_NAME_SIZE 32
/****************************************************************************
* Private Types
****************************************************************************/
struct uinput_button_lowerhalf_s
{
struct btn_lowerhalf_s lower;
btn_buttonset_t buttons;
btn_handler_t handler;
FAR void *arg;
};
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
#ifdef CONFIG_INPUT_TOUCHSCREEN
static ssize_t uinput_touch_write(FAR struct touch_lowerhalf_s *lower,
FAR const char *buffer, size_t buflen);
#endif
#ifdef CONFIG_INPUT_BUTTONS
static ssize_t uinput_button_write(FAR const struct btn_lowerhalf_s *lower,
FAR const char *buffer, size_t buflen);
static btn_buttonset_t uinput_button_supported(FAR const struct
btn_lowerhalf_s *lower);
static btn_buttonset_t uinput_button_buttons(FAR const struct
btn_lowerhalf_s *lower);
static void uinput_button_enable(FAR const struct btn_lowerhalf_s *lower,
btn_buttonset_t press,
btn_buttonset_t release,
btn_handler_t handler,
FAR void *arg);
#endif
/****************************************************************************
* Private Functions
****************************************************************************/
#ifdef CONFIG_INPUT_TOUCHSCREEN
/****************************************************************************
* Name: uinput_touch_write
****************************************************************************/
@ -65,6 +99,65 @@ static ssize_t uinput_touch_write(FAR struct touch_lowerhalf_s *lower,
touch_event(lower->priv, sample);
return buflen;
}
#endif /* CONFIG_INPUT_TOUCHSCREEN */
#ifdef CONFIG_INPUT_BUTTONS
/****************************************************************************
* Name: uinput_button_write
****************************************************************************/
static ssize_t uinput_button_write(FAR const struct btn_lowerhalf_s *lower,
FAR const char *buffer, size_t buflen)
{
FAR struct uinput_button_lowerhalf_s *ubtn_lower =
(FAR struct uinput_button_lowerhalf_s *)lower;
if (buflen != sizeof(btn_buttonset_t))
{
return -EINVAL;
}
ubtn_lower->buttons = *(btn_buttonset_t *)buffer;
ubtn_lower->handler(&ubtn_lower->lower, ubtn_lower->arg);
return buflen;
}
/****************************************************************************
* Name: uinput_button_supported
****************************************************************************/
static btn_buttonset_t uinput_button_supported(FAR const struct
btn_lowerhalf_s *lower)
{
return ~0u;
}
/****************************************************************************
* Name: uinput_button_buttons
****************************************************************************/
static btn_buttonset_t
uinput_button_buttons(FAR const struct btn_lowerhalf_s *lower)
{
FAR struct uinput_button_lowerhalf_s *ubtn_lower =
(FAR struct uinput_button_lowerhalf_s *)lower;
return ubtn_lower->buttons;
}
static void uinput_button_enable(FAR const struct btn_lowerhalf_s *lower,
btn_buttonset_t press,
btn_buttonset_t release,
btn_handler_t handler, FAR void *arg)
{
FAR struct uinput_button_lowerhalf_s *ubtn_lower =
(FAR struct uinput_button_lowerhalf_s *)lower;
ubtn_lower->arg = arg;
ubtn_lower->handler = handler;
}
#endif /* CONFIG_INPUT_BUTTONS */
/****************************************************************************
* Public Functions
@ -106,3 +199,20 @@ int uinput_touch_initialize(FAR const char *name, int maxpoint, int buffnums)
return touch_register(lower, devname, buffnums);
}
#ifdef CONFIG_INPUT_BUTTONS
int uinput_button_initialize(FAR const char *name)
{
char devname[UINPUT_NAME_SIZE];
FAR struct uinput_button_lowerhalf_s *ubtn_lower;
ubtn_lower = kmm_zalloc(sizeof(struct uinput_button_lowerhalf_s));
ubtn_lower->lower.bl_buttons = uinput_button_buttons;
ubtn_lower->lower.bl_enable = uinput_button_enable;
ubtn_lower->lower.bl_supported = uinput_button_supported;
ubtn_lower->lower.bl_write = uinput_button_write;
snprintf(devname, UINPUT_NAME_SIZE, "/dev/%s", name);
return btn_register(devname, &ubtn_lower->lower);
}
#endif /* CONFIG_INPUT_BUTTONS */

5
include/nuttx/input/buttons.h
View File

@ -148,6 +148,11 @@ struct btn_lowerhalf_s
CODE void (*bl_enable)(FAR const struct btn_lowerhalf_s *lower,
btn_buttonset_t press, btn_buttonset_t release,
btn_handler_t handler, FAR void *arg);
/* Key write callback function */
CODE ssize_t (*bl_write)(FAR const struct btn_lowerhalf_s *lower,
FAR const char *buffer, size_t buflen);
};
/****************************************************************************

17
include/nuttx/input/uinput.h
View File

@ -49,4 +49,21 @@
int uinput_touch_initialize(FAR const char *name, int maxpoint,
int buffnums);
/****************************************************************************
* Name: uinput_button_initialize
*
* Description:
* Initialized the uinput button device
*
* Input Parameters:
* name: Button devices name
*
* Returned Value:
* Zero is returned on success. Otherwise, a negated errno value is
* returned to indicate the nature of the failure.
*
****************************************************************************/
int uinput_button_initialize(FAR const char *name);
#endif /* __INCLUDE_NUTTX_INPUT_UINPUT_H */