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drivers/rf/dat-31r5-sp.c: dd support to the DAT-31R5-SP+ digital attenuator. Creates a the new device driver directory drivers/rf/ to support drivers related to RF peripherals. It also adds support for the DAT-31R5-SP+ digital attenuator.
This commit is contained in:
Augusto Fraga Giachero
committed by
Gregory Nutt
Gregory Nutt
parent
822bb06967
commit
f08ab217b0
@@ -0,0 +1,12 @@
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#
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# For a description of the syntax of this configuration file,
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# see the file kconfig-language.txt in the NuttX tools repository.
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#
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config RF_DAT31R5SP
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bool "Mini-Circuits DAT-31R5-SP digital attenuator support"
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default n
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select SPI
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---help---
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Enable driver support for the Mini-Circuits DAT-31R5-SP digital
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attenuator.
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@@ -0,0 +1,57 @@
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############################################################################
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# drivers/rf/Make.defs
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#
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# Copyright (C) 2011-2012, 2015-2018 Gregory Nutt. All rights reserved.
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# Copyright (C) 2019 Augusto Fraga Giachero. All rights reserved.
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# Author: Augusto Fraga Giachero <afg@augustofg.net>
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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#
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in
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# the documentation and/or other materials provided with the
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# distribution.
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# 3. Neither the name NuttX nor the names of its contributors may be
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# used to endorse or promote products derived from this software
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# without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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#
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############################################################################
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# Include rf drivers
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RFDEPPATH =
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RFVPATH =
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ifeq ($(CONFIG_DRIVERS_RF),y)
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ifeq ($(CONFIG_SPI),y)
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ifeq ($(CONFIG_RF_DAT31R5SP),y)
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CSRCS += dat-31r5-sp.c
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RFDEPPATH = --dep-path rf
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RFVPATH = :rf
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endif
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endif # CONFIG_SPI
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endif # CONFIG_DRIVERS_RF
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DEPPATH += $(RFDEPPATH)
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VPATH += $(RFVPATH)
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@@ -0,0 +1,298 @@
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/****************************************************************************
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* drivers/rf/dat-31r5-sp.c
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* Character driver for the Mini-Circuits DAT-31R5-SP+ digital step
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* attenuator.
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*
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* Copyright (C) 2019, Augusto Fraga Giachero. All rights reserved.
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* Author: Augusto Fraga Giachero <afg@augustofg.net>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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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 <stdlib.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/kmalloc.h>
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#include <nuttx/fs/fs.h>
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#include <nuttx/spi/spi.h>
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#include <nuttx/rf/ioctl.h>
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#include <nuttx/rf/attenuator.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#if defined(CONFIG_SPI) && defined(CONFIG_RF_DAT31R5SP)
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#ifndef CONFIG_DAT31R5SP_SPI_FREQUENCY
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# define CONFIG_DAT31R5SP_SPI_FREQUENCY 1000000
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#endif
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#define DAT31R5SP_SPI_MODE (SPIDEV_MODE0) /* SPI Mode 0: CPOL=0,CPHA=0 */
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/****************************************************************************
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* Private Types
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****************************************************************************/
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struct dat31r5sp_dev_s
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{
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FAR struct spi_dev_s *spi; /* Saved SPI driver instance */
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int spidev;
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};
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/* Character driver methods */
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static int dat31r5sp_open(FAR struct file *filep);
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static int dat31r5sp_close(FAR struct file *filep);
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static ssize_t dat31r5sp_read(FAR struct file *filep, FAR char *buffer,
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size_t buflen);
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static ssize_t dat31r5sp_write(FAR struct file *filep,
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FAR const char *buffer, size_t buflen);
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static int dat31r5sp_ioctl(FAR struct file *filep, int cmd,
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unsigned long arg);
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static const struct file_operations g_dat31r5sp_fops =
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{
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dat31r5sp_open,
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dat31r5sp_close,
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dat31r5sp_read,
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dat31r5sp_write,
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NULL,
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dat31r5sp_ioctl,
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NULL
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};
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: dat31r5sp_configspi
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*
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* Description:
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* Configure the SPI instance for to match the DAT-31R5-SP+
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* specifications
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*
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****************************************************************************/
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static inline void dat31r5sp_configspi(FAR struct spi_dev_s *spi)
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{
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SPI_SETMODE(spi, DAT31R5SP_SPI_MODE);
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SPI_SETBITS(spi, 8);
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SPI_HWFEATURES(spi, 0);
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SPI_SETFREQUENCY(spi, CONFIG_DAT31R5SP_SPI_FREQUENCY);
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}
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/****************************************************************************
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* Name: dat31r5sp_set_attenuation
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*
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* Description:
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* Set the attenuation level in dB (16.16 bits fixed point).
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*
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****************************************************************************/
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static void dat31r5sp_set_attenuation(FAR struct dat31r5sp_dev_s *priv,
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b16_t attenuation)
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{
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SPI_LOCK(priv->spi, true);
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dat31r5sp_configspi(priv->spi);
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SPI_SELECT(priv->spi, priv->spidev, false);
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/* Convert the attenuation value from 16.16 bits to 5.1 bits. */
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SPI_SEND(priv->spi, (uint8_t)(attenuation >> 15));
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/* Send a pulse to the LE pin */
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SPI_SELECT(priv->spi, priv->spidev, true);
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up_udelay(1);
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SPI_SELECT(priv->spi, priv->spidev, false);
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SPI_LOCK(priv->spi, false);
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}
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/****************************************************************************
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* Name: dat31r5sp_open
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*
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* Description:
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* This function is called whenever the DAT-31R5-SP+ device is
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* opened.
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*
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****************************************************************************/
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static int dat31r5sp_open(FAR struct file *filep)
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{
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return OK;
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}
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/****************************************************************************
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* Name: dat31r5sp_close
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*
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* Description:
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* This function is called whenever the DAT-31R5-SP+ device is
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* closed.
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*
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****************************************************************************/
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static int dat31r5sp_close(FAR struct file *filep)
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{
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return OK;
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}
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/****************************************************************************
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* Name: dat31r5sp_write
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*
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* Description:
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* Write is not permited, only IOCTLs.
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****************************************************************************/
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static ssize_t dat31r5sp_write(FAR struct file *filep, FAR const char *buffer,
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size_t buflen)
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{
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return -ENOSYS;
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}
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/****************************************************************************
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* Name: dat31r5sp_read
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*
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* Description:
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* Read is ignored.
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****************************************************************************/
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static ssize_t dat31r5sp_read(FAR struct file *filep, FAR char *buffer,
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size_t buflen)
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{
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return 0;
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}
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/****************************************************************************
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* Name: dat31r5sp_ioctl
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*
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* Description:
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* The only available ICTL is RFIOC_SETATT. It expects a struct
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* attenuator_control* as the argument to set the attenuation
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* level. The channel is ignored as the DAT-31R5-SP+ has just a
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* single attenuator.
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****************************************************************************/
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static int dat31r5sp_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
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{
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FAR struct inode *inode = filep->f_inode;
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FAR struct dat31r5sp_dev_s *priv = inode->i_private;
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int ret = OK;
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switch (cmd)
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{
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case RFIOC_SETATT:
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{
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FAR struct attenuator_control *att =
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(FAR struct attenuator_control *)((uintptr_t)arg);
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DEBUGASSERT(ptr != NULL);
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dat31r5sp_set_attenuation(priv, att->attenuation);
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}
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break;
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default:
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sninfo("Unrecognized cmd: %d\n", cmd);
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ret = -ENOTTY;
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break;
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}
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return ret;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: dat31r5sp_register
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*
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* Description:
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* Register the dat31r5sp character device as 'devpath'.
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*
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****************************************************************************/
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int dat31r5sp_register(FAR const char *devpath,
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FAR struct spi_dev_s *spi,
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int spidev)
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{
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FAR struct dat31r5sp_dev_s *priv;
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int ret;
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/* Sanity check */
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DEBUGASSERT(spi != NULL);
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/* Initialize the DAT-31R5-SP+ device structure */
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priv = (FAR struct dat31r5sp_dev_s *)kmm_malloc(sizeof(struct dat31r5sp_dev_s));
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if (priv == NULL)
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{
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snerr("ERROR: Failed to allocate instance\n");
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return -ENOMEM;
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}
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priv->spi = spi;
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priv->spidev = spidev;
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/* Clear the LE pin */
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SPI_SELECT(priv->spi, priv->spidev, false);
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/* Register the character driver */
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ret = register_driver(devpath, &g_dat31r5sp_fops, 0666, priv);
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if (ret < 0)
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{
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snerr("ERROR: Failed to register driver: %d\n", ret);
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kmm_free(priv);
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}
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return ret;
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}
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#endif
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