187 lines
6.5 KiB
C
187 lines
6.5 KiB
C
/****************************************************************************
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* include/nuttx/leds/userled.h
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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#ifndef __INCLUDE_NUTTX_LEDS_USERLED_H
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#define __INCLUDE_NUTTX_LEDS_USERLED_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <nuttx/fs/ioctl.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* ioctl commands */
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/* Command: ULEDIOC_SUPPORTED
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* Description: Report the set of LEDs supported by the hardware;
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* Argument: A pointer to writeable userled_set_t value in which to
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* return the set of supported LEDs.
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* Return: Zero (OK) on success. Minus one will be returned on failure
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* with the errno value set appropriately.
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*/
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#define ULEDIOC_SUPPORTED _ULEDIOC(0x0001)
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/* Command: ULEDIOC_SETLED
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* Description: Set the state of one LED.
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* Argument: A read-only pointer to an instance of struct userled_s
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* Return: Zero (OK) on success. Minus one will be returned on failure
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* with the errno value set appropriately.
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*/
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#define ULEDIOC_SETLED _ULEDIOC(0x0002)
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/* Command: ULEDIOC_SETALL
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* Description: Set the state of all LEDs.
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* Argument: A value of type userled_set_t cast to unsigned long
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* Return: Zero (OK) on success. Minus one will be returned on failure
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* with the errno value set appropriately.
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*/
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#define ULEDIOC_SETALL _ULEDIOC(0x0003)
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/* Command: ULEDIOC_GETALL
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* Description: Get the state of one LED.
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* Argument: A write-able pointer to a userled_set_t memory location in
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* which to return the LED state.
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* Return: Zero (OK) on success. Minus one will be returned on failure
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* with the errno value set appropriately.
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*/
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#define ULEDIOC_GETALL _ULEDIOC(0x0004)
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/* This type is a bit set that contains the state of all LEDs as defined
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* in arch/board/board.h. This is the value that is returned when reading
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* from or writing to the LED driver.
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*/
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typedef uint32_t userled_set_t;
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/* A reference to this structure is provided with the ULEDIOC_SETLED IOCTL
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* command and describes the LED to be set and the new value of the LED.
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* The encoding of LEDs is provided in the board-specific board.h header
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* file.
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*/
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struct userled_s
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{
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uint8_t ul_led; /* Identifies the LED */
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bool ul_on; /* The LED state. true: ON; false: OFF */
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};
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/* The user LED driver is a two-part driver:
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*
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* 1) A common upper half driver that provides the common user interface to
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* the LEDs,
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* 2) Platform-specific lower half drivers that provide the interface
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* between the common upper half and the platform discrete LED outputs.
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*
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* This structure defines the interface between an instance of the lower
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* half driver and the common upper half driver. Such an instance is
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* passed to the upper half driver when the driver is initialized, binding
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* the upper and lower halves into one driver.
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*/
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struct userled_lowerhalf_s
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{
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/* Return the set of LEDs supported by the board */
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CODE userled_set_t
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(*ll_supported)(FAR const struct userled_lowerhalf_s *lower);
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/* Set the current state of one LED */
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CODE void (*ll_led)(FAR const struct userled_lowerhalf_s *lower,
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int led, bool ledon);
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/* Set the state of all LEDs */
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CODE void (*ll_ledset)(FAR const struct userled_lowerhalf_s *lower,
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userled_set_t ledset);
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};
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/****************************************************************************
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* Public Data
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****************************************************************************/
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#ifdef __cplusplus
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Name: userled_register
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*
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* Description:
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* Bind the lower half LED driver to an instance of the upper half
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* LED driver and register the composite character driver as the
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* specified device.
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*
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* Input Parameters:
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* devname - The name of the LED device to be registered.
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* This should be a string of the form "/dev/ledN" where N is the
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* minor device number.
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* lower - An instance of the platform-specific LED lower half driver.
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*
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* Returned Value:
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* Zero (OK) is returned on success. Otherwise a negated errno value is
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* returned to indicate the nature of the failure.
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*
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****************************************************************************/
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int userled_register(FAR const char *devname,
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FAR const struct userled_lowerhalf_s *lower);
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/****************************************************************************
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* Name: userled_lower_initialize
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*
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* Description:
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* Initialize the generic LED lower half driver, bind it and register
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* it with the upper half LED driver as devname.
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*
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****************************************************************************/
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#ifdef CONFIG_USERLED_LOWER
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int userled_lower_initialize(FAR const char *devname);
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#endif
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#undef EXTERN
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#ifdef __cplusplus
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}
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#endif
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#endif /* __INCLUDE_NUTTX_LEDS_USERLED_H */
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