drivers/input: add Cypress MBR3108 CapSense touch button driver

drivers/input/Kconfig

@@ -322,6 +322,30 @@ config STMPE811_REGDEBUG
 
 endif # INPUT_STMPE811
 
+config INPUT_CYPRESS_MBR3108
+	bool "Enable Cypress MBR3108 CapSense driver"
+	default n
+	---help---
+		Enable support for Cypress MBR3108 CapSense touch button & proximity
+		input sensor.
+
+if INPUT_CYPRESS_MBR3108
+
+config INPUT_CYPRESS_MBR3108_DEBUG
+	bool "Enable debug support for Cypress sensor"
+	default n
+	depends on DEBUG_FEATURES
+	---help---
+		Enable debugging traces for MBR3108 driver
+
+config INPUT_CYPRESS_MBR3108_NPOLLWAITERS
+	int "Number of waiters to poll"
+	default 1
+	---help---
+		Maximum number of threads that can be waiting on poll()
+
+endif # INPUT_CYPRESS_MBR3108
+
 config BUTTONS
 	bool "Button Inputs"
 	default n

drivers/input/Make.defs

@@ -71,6 +71,10 @@ ifneq ($(CONFIG_INPUT_STMPE811_TEMP_DISABLE),y)
 endif
 endif
 
+ifeq ($(CONFIG_INPUT_CYPRESS_MBR3108),y)
+  CSRCS += cypress_mbr3108.c
+endif
+
 ifeq ($(CONFIG_BUTTONS),y)
   CSRCS += button_upper.c
 ifeq ($(CONFIG_BUTTONS_LOWER),y)

include/nuttx/input/cypress_mbr3108.h

@@ -0,0 +1,139 @@
+/****************************************************************************
+ * include/nuttx/input/cypress_mbr3108.c
+ *
+ *   Copyright (C) 2014 Haltian Ltd. All rights reserved.
+ *   Author: Jussi Kivilinna <jussi.kivilinna@haltian.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+#ifndef __INCLUDE_NUTTX_INPUT_CYPRESS_MBR3108_H_
+#define __INCLUDE_NUTTX_INPUT_CYPRESS_MBR3108_H_
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/compiler.h>
+#include <stdbool.h>
+#include <stdint.h>
+
+/****************************************************************************
+ * Public Types
+ ****************************************************************************/
+
+/* Sensor configuration for Cypress MBR3108 device */
+
+begin_packed_struct struct mbr3108_sensor_conf_s
+{
+  uint8_t conf_data[128];  /* Sensor configuration, generated with EZ-Click. */
+} end_packed_struct;
+
+/* Debug configuration */
+
+begin_packed_struct struct mbr3108_debug_conf_s
+{
+  bool debug_mode;         /* Configure to debug mode if 'true'. */
+  uint8_t debug_sensor_id; /* Sensor to read in debug mode. */
+} end_packed_struct;
+
+/* Write commands to MBR3108 driver. */
+
+begin_packed_struct enum mbr3108_cmd_e
+{
+  CYPRESS_MBR3108_CMD_SENSOR_CONF = -3,
+  CYPRESS_MBR3108_CMD_DEBUG_CONF,
+  CYPRESS_MBR3108_CMD_CLEAR_LATCHED,
+} end_packed_struct;
+
+/* CYPRESS_MBR3108_CMD_SENSOR_CONF command structure. Used to reconfigure
+ * chip with new configuration generated using EZ-Click tool. */
+
+begin_packed_struct struct mbr3108_cmd_sensor_conf_s
+{
+  enum mbr3108_cmd_e id;
+  struct mbr3108_sensor_conf_s conf;
+} end_packed_struct;
+
+/* CYPRESS_MBR3108_CMD_DEBUG_CONF command structure. Use to enable debug
+ * output from chip/sensor, see 'struct mbr3108_sensor_data_s'. */
+
+begin_packed_struct struct mbr3108_cmd_debug_conf_s
+{
+  enum mbr3108_cmd_e id;
+  struct mbr3108_debug_conf_s conf;
+} end_packed_struct;
+
+/* Sensor status output */
+
+begin_packed_struct struct mbr3108_sensor_status_s
+{
+  unsigned int button:8;            /* MBR3108 has maximum of 8 button sensors
+                                     * configurable.
+                                     * Each bit in this field indicate if
+                                     * corresponding button is pressed. */
+  unsigned int latched_button:8;
+  unsigned int proximity:2;         /* MBR3108 has maximum of 2 proximity
+                                     * sensors configurable. */
+  unsigned int latched_proximity:2;
+} end_packed_struct;
+
+/* Sensor debug data output */
+
+begin_packed_struct struct mbr3108_sensor_debug_s
+{
+  uint8_t sensor_total_capacitance;
+  uint16_t sensor_diff_counts;
+  uint16_t sensor_baseline;
+  uint16_t sensor_raw_counts;
+  uint16_t sensor_average_counts;
+} end_packed_struct;
+
+/* Board configuration */
+
+struct mbr3108_board_s
+{
+  int (*irq_attach) (FAR struct mbr3108_board_s *state, xcpt_t isr, FAR void *arg);
+  void (*irq_enable) (FAR struct mbr3108_board_s *state, bool enable);
+  int (*set_power) (FAR struct mbr3108_board_s *state, bool on);
+};
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+/* Device registration */
+
+int cypress_mbr3108_register(FAR const char *devpath,
+                             FAR struct i2c_master_s *dev,
+                             uint8_t i2c_devaddr,
+                             struct mbr3108_board_s *board_config,
+                             const struct mbr3108_sensor_conf_s *sensor_conf);
+
+#endif /* __INCLUDE_NUTTX_INPUT_CYPRESS_MBR3108_H_ */