936df1bcb5
Squashed commit of the following:
Change all calls to usleep() in the OS proper to calls to nxsig_usleep()
sched/signal: Add a new OS internal function nxsig_usleep() that is functionally equivalent to usleep() but does not cause a cancellaption point and does not modify the errno variable.
sched/signal: Add a new OS internal function nxsig_sleep() that is functionally equivalent to sleep() but does not cause a cancellaption point.
308 lines
10 KiB
C
308 lines
10 KiB
C
/****************************************************************************
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* config/u-blox-c027/src/lpc17_ubxmdm.c
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*
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* Copyright (C) 2016 Vladimir Komendantskiy. All rights reserved.
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* Author: Vladimir Komendantskiy <vladimir@moixaenergy.com>
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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 <sys/types.h>
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#include <stdbool.h>
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#include <string.h>
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#include <poll.h>
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#include <errno.h>
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#include <unistd.h>
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#include <nuttx/irq.h>
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#include <nuttx/kmalloc.h>
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#include <nuttx/signal.h>
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#include <nuttx/fs/fs.h>
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#include <nuttx/modem/u-blox.h>
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#include <arch/board/board.h>
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#include "lpc17_gpio.h"
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#include "u-blox-c027.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Debug ********************************************************************/
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/* Non-standard debug that may be enabled just for testing the modem driver */
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#ifdef CONFIG_MODEM_U_BLOX_DEBUG
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# define m_err _err
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# define m_info _info
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#else
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# define m_err(x...)
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# define m_info(x...)
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#endif
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#define UBXMDM_REGISTER_COUNT \
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(sizeof(lpc17_ubxmdm_name_pins) / \
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sizeof(struct lpc17_name_pin))
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/* Core interface pin connections. These do not include UART or USB pins. */
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struct lpc17_ubxmdm_pins
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{
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lpc17_pinset_t ldo_enable;
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lpc17_pinset_t power_on_n;
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lpc17_pinset_t reset_n;
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lpc17_pinset_t shifter_en_n;
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lpc17_pinset_t usb_detect;
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};
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/* This structure type provides the private representation of the "lower-half"
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* driver state. This type must be coercible to type 'ubxmdm_lower'.
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*/
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struct lpc17_ubxmdm_lower
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{
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FAR const struct ubxmdm_ops* ops; /* Lower half operations */
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/* Private, architecture-specific information. */
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FAR const struct lpc17_ubxmdm_pins* pins;
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bool usb_used;
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};
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/* Pair type for associating a register name to a pin. */
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struct lpc17_name_pin
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{
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const char name[3];
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const lpc17_pinset_t pin;
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};
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/* "Lower half" driver methods **********************************************/
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static int lpc17_poweron (FAR struct ubxmdm_lower* lower);
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static int lpc17_poweroff (FAR struct ubxmdm_lower* lower);
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static int lpc17_reset (FAR struct ubxmdm_lower* lower);
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static int lpc17_getstatus(FAR struct ubxmdm_lower* lower,
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FAR struct ubxmdm_status* status);
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static int lpc17_ioctl (FAR struct ubxmdm_lower* lower,
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int cmd,
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unsigned long arg);
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/* "Lower half" driver state */
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static struct lpc17_ubxmdm_lower lpc17_ubxmdm_lower;
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/* "Lower half" driver methods */
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static const struct lpc17_ubxmdm_pins lpc17_ubxmdm_pins =
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{
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.ldo_enable = C027_MDMLDOEN,
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.power_on_n = C027_MDMPWR,
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.reset_n = C027_MDMRST,
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.shifter_en_n = C027_MDMLVLOE,
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.usb_detect = C027_MDMUSBDET,
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};
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static const struct ubxmdm_ops lpc17_ubxmdm_ops =
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{
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.poweron = lpc17_poweron,
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.poweroff = lpc17_poweroff,
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.reset = lpc17_reset,
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.getstatus = lpc17_getstatus,
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.ioctl = lpc17_ioctl,
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};
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static const struct lpc17_name_pin lpc17_ubxmdm_name_pins[] =
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{
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{{'T','X','D'}, GPIO_UART1_TXD},
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{{'R','X','D'}, GPIO_UART1_RXD},
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{{'C','T','S'}, GPIO_UART1_CTS},
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{{'R','T','S'}, GPIO_UART1_RTS},
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{{'D','C','D'}, GPIO_UART1_DCD},
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{{'D','S','R'}, GPIO_UART1_DSR},
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{{'D','T','R'}, GPIO_UART1_DTR},
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{{'R','I',' '}, GPIO_UART1_RI },
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{{'I','O','1'}, C027_MDMGPIO1 },
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{{'R','S','T'}, C027_MDMRST },
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{{'P','W','R'}, C027_MDMPWR },
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{{'D','E','T'}, C027_MDMUSBDET},
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{{'L','D','O'}, C027_MDMLDOEN },
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{{'L','V','L'}, C027_MDMLVLOE },
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};
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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static int lpc17_poweron(FAR struct ubxmdm_lower* lower)
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{
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FAR struct lpc17_ubxmdm_lower* priv =
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(FAR struct lpc17_ubxmdm_lower*) lower;
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lpc17_pinset_t usb_detect_val;
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lpc17_configgpio(priv->pins->reset_n | GPIO_VALUE_ONE); /* Modem not in reset */
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lpc17_configgpio(priv->pins->power_on_n | GPIO_VALUE_ZERO); /* Switch closed to GND */
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nxsig_usleep(10 * 1000); /* Min. time for power_on_n being low is 5 ms */
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if (priv->usb_used)
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{
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usb_detect_val = GPIO_VALUE_ONE; /* USB sense on */
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}
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else
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{
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usb_detect_val = GPIO_VALUE_ZERO; /* USB sense off */
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}
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lpc17_configgpio(priv->pins->usb_detect | usb_detect_val);
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lpc17_configgpio(priv->pins->ldo_enable | GPIO_VALUE_ONE); /* LDO enabled */
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nxsig_usleep(1 * 1000); /* Delay to obtain correct voltage on shifters */
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lpc17_configgpio(priv->pins->shifter_en_n | GPIO_VALUE_ZERO); /* UART shifter enabled */
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/* lpc17_configgpio(priv->pins->power_on_n | GPIO_VALUE_ONE); * Stop current through switch */
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return OK;
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}
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static int lpc17_poweroff(FAR struct ubxmdm_lower* lower)
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{
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FAR struct lpc17_ubxmdm_lower* priv =
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(FAR struct lpc17_ubxmdm_lower*) lower;
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lpc17_configgpio(priv->pins->ldo_enable | GPIO_VALUE_ZERO); /* LDO disabled */
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lpc17_configgpio(priv->pins->reset_n | GPIO_VALUE_ONE); /* Modem not in reset */
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lpc17_configgpio(priv->pins->power_on_n | GPIO_VALUE_ONE); /* Switch open */
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lpc17_configgpio(priv->pins->shifter_en_n | GPIO_VALUE_ONE); /* UART shifter disabled */
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lpc17_configgpio(priv->pins->usb_detect | GPIO_VALUE_ZERO); /* USB sense off */
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return OK;
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}
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static int lpc17_reset(FAR struct ubxmdm_lower* lower)
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{
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FAR struct lpc17_ubxmdm_lower* priv =
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(FAR struct lpc17_ubxmdm_lower*) lower;
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lpc17_configgpio(priv->pins->reset_n | GPIO_VALUE_ZERO); /* Modem in reset */
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nxsig_usleep(75 * 1000); /* The minimum reset_n low time is 50 ms */
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lpc17_configgpio(priv->pins->reset_n | GPIO_VALUE_ONE); /* Modem not in reset */
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return OK;
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}
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static int lpc17_getstatus(FAR struct ubxmdm_lower* lower,
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FAR struct ubxmdm_status* status)
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{
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FAR struct lpc17_ubxmdm_lower* priv =
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(FAR struct lpc17_ubxmdm_lower*) lower;
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int i;
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status->on =
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lpc17_gpioread(priv->pins->ldo_enable) &&
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lpc17_gpioread(priv->pins->reset_n) &&
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!lpc17_gpioread(priv->pins->shifter_en_n);
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DEBUGASSERT(status->register_values_size >= UBXMDM_REGISTER_COUNT);
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status->register_values_size = UBXMDM_REGISTER_COUNT;
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for (i = 0; i < UBXMDM_REGISTER_COUNT; i++)
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{
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strncpy(status->register_values[i].name,
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lpc17_ubxmdm_name_pins[i].name,
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3);
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status->register_values[i].val =
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lpc17_gpioread(lpc17_ubxmdm_name_pins[i].pin);
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}
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return OK;
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}
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static int lpc17_ioctl(FAR struct ubxmdm_lower* lower,
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int cmd,
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unsigned long arg)
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{
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/* No platform-specific IOCTL at the moment. */
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return -ENOSYS;
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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: lpc17_ubxmdm_init
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*
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* Description:
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* Initialize the modem. The modem is initialized and
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* registered at '/dev/ubxmdm'.
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*
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* Input Parameters:
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* usb_used - enables the USB sense pin if 'true'
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*
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* Returned Values:
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* None
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*
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****************************************************************************/
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void lpc17_ubxmdm_init(bool usb_used)
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{
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FAR struct lpc17_ubxmdm_lower* priv = &lpc17_ubxmdm_lower;
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DEBUGASSERT(priv->ops == NULL && priv->pins == NULL);
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/* Initialize the driver state structure. Here we assume: (1) the state
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* structure lies in .bss and was zeroed at reset time. (2) This function
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* is only called once so it is never necessary to re-zero the structure.
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*/
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priv->ops = &lpc17_ubxmdm_ops;
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priv->pins = &lpc17_ubxmdm_pins;
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priv->usb_used = usb_used;
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lpc17_poweroff((FAR struct ubxmdm_lower*) priv);
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(void) ubxmdm_register("/dev/ubxmdm", (FAR struct ubxmdm_lower*) priv);
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}
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