driver: add uinput support

Signed-off-by: yinshengkai <yinshengkai@xiaomi.com>

boards/sim/sim/sim/src/sim_bringup.c

@@ -36,6 +36,7 @@
 #include <nuttx/fs/nxffs.h>
 #include <nuttx/fs/rpmsgfs.h>
 #include <nuttx/i2c/i2c_master.h>
+#include <nuttx/input/uinput.h>
 #include <nuttx/spi/spi_transfer.h>
 #include <nuttx/rc/lirc_dev.h>
 #include <nuttx/rc/dummy.h>
@@ -318,6 +319,16 @@ int sim_bringup(void)
     }
 #endif
 
+#ifdef CONFIG_INPUT_UINPUT
+  /* Initialize the touchscreen uinput */
+
+  ret = uinput_touch_initialize("utouch", 1, 4);
+  if (ret < 0)
+    {
+      syslog(LOG_ERR, "ERROR: uinput_touch_initialize failed: %d\n", ret);
+    }
+#endif
+
 #ifdef CONFIG_IEEE802154_LOOPBACK
   /* Initialize and register the IEEE802.15.4 MAC network loop device */
 

drivers/input/Kconfig

@@ -45,6 +45,13 @@ config INPUT_TOUCHSCREEN_NPOLLWAITERS
 
 endif # INPUT_TOUCHSCREEN
 
+config INPUT_UINPUT
+	bool "Enable uinput"
+	select INPUT_TOUCHSCREEN
+	default n
+	---help---
+		Enable support virtual input device driver
+
 config INPUT_MAX11802
 	bool "MAX11802 touchscreen controller"
 	default n

drivers/input/Make.defs

@@ -32,6 +32,10 @@ ifeq ($(CONFIG_INPUT_TSC2007),y)
   CSRCS += tsc2007.c
 endif
 
+ifeq ($(CONFIG_INPUT_UINPUT),y)
+  CSRCS += uinput.c
+endif
+
 ifeq ($(CONFIG_INPUT_FT5X06),y)
   CSRCS += ft5x06.c
 endif

drivers/input/uinput.c

@@ -0,0 +1,108 @@
+/****************************************************************************
+ * drivers/input/uinput.c
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <sys/types.h>
+
+#include <assert.h>
+#include <debug.h>
+#include <errno.h>
+#include <stdio.h>
+
+#include <nuttx/kmalloc.h>
+#include <nuttx/input/touchscreen.h>
+#include <nuttx/input/uinput.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+#define UINPUT_NAME_SIZE 32
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+static ssize_t uinput_touch_write(FAR struct touch_lowerhalf_s *lower,
+                                  FAR const char *buffer, size_t buflen);
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: uinput_touch_write
+ ****************************************************************************/
+
+static ssize_t uinput_touch_write(FAR struct touch_lowerhalf_s *lower,
+                                  FAR const char *buffer, size_t buflen)
+{
+  FAR const struct touch_sample_s *sample;
+  sample = (FAR const struct touch_sample_s *)buffer;
+
+  if (sample == NULL)
+    {
+      return -EINVAL;
+    }
+
+  touch_event(lower->priv, sample);
+  return buflen;
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: uinput_touch_initialize
+ *
+ * Description:
+ *   Initialized the uinput touchscreen device
+ *
+ * Input Parameters:
+ *   name:      Touchscreen devices name
+ *   maxpoint:  Maximum number of touch points supported.
+ *   buff_nums: Number of the touch points structure.
+ *
+ * Returned Value:
+ *   Zero is returned on success.  Otherwise, a negated errno value is
+ *   returned to indicate the nature of the failure.
+ *
+ ****************************************************************************/
+
+int uinput_touch_initialize(FAR const char *name, int maxpoint, int buffnums)
+{
+  char devname[UINPUT_NAME_SIZE];
+  FAR struct touch_lowerhalf_s *lower;
+
+  lower = kmm_malloc(sizeof(struct touch_lowerhalf_s));
+  if (!lower)
+    {
+      return -ENOMEM;
+    }
+
+  /* Regiest Touchscreen device */
+
+  lower->write    = uinput_touch_write;
+  lower->maxpoint = maxpoint;
+  snprintf(devname, UINPUT_NAME_SIZE, "/dev/%s", name);
+
+  return touch_register(lower, devname, buffnums);
+}

include/nuttx/input/uinput.h

@@ -0,0 +1,52 @@
+/****************************************************************************
+ * include/nuttx/input/uinput.h
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ ****************************************************************************/
+
+#ifndef __INCLUDE_NUTTX_INPUT_UINPUT_H
+#define __INCLUDE_NUTTX_INPUT_UINPUT_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/types.h>
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: uinput_touch_initialize
+ *
+ * Description:
+ *   Initialized the uinput touchscreen device
+ *
+ * Input Parameters:
+ *   name:      Touchscreen devices name
+ *   maxpoint:  Maximum number of touch points supported.
+ *   buff_nums: Number of the touch points structure.
+ *
+ * Returned Value:
+ *   Zero is returned on success. Otherwise, a negated errno value is
+ *   returned to indicate the nature of the failure.
+ *
+ ****************************************************************************/
+
+int uinput_touch_initialize(FAR const char *name, int maxpoint,
+                            int buffnums);
+
+#endif /* __INCLUDE_NUTTX_INPUT_UINPUT_H */