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nuttx/drivers/contactless/pn532.c
Gregory Nutt 936df1bcb5 Adds new OS internal functions nxsig_sleep() and nxsig_usleep. These differ from the standard sleep() and usleep() in that (1) they don't cause cancellation points, and (2) don't set the errno variable (if applicable). All calls to sleep() and usleep() changed to calls to nxsig_sleep() and nxsig_usleep(). 
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.
2017-10-06 10:15:01 -06:00

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/****************************************************************************
* drivers/contactless/pn532.c
*
* Copyright(C) 2012, 2013, 2016 Offcode Ltd. All rights reserved.
* Authors: Janne Rosberg <janne@offcode.fi>
* Teemu Pirinen <teemu@offcode.fi>
* Juho Grundström <juho@offcode.fi>
*
* 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include <nuttx/kmalloc.h>
#include <nuttx/signal.h>
#include "pn532.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Configuration ************************************************************/
/* Bit order H/W feature must be enabled in order to support LSB first
* operation.
*/
#if !defined(CONFIG_SPI_HWFEATURES) || !defined(CONFIG_SPI_BITORDER)
# error CONFIG_SPI_HWFEATURES=y and CONFIG_SPI_BITORDER=y required by this driver
#endif
#ifndef CONFIG_ARCH_HAVE_SPI_BITORDER
# warning This platform does not support SPI LSB-bit order
#endif
#ifdef CONFIG_CL_PN532_DEBUG
# define pn532err _err
# define pn532info _info
#else
# ifdef CONFIG_CPP_HAVE_VARARGS
# define pn532err(x...)
# define pn532info(x...)
# else
# define pn532err (void)
# define pn532info (void)
# endif
#endif
#ifdef CONFIG_CL_PN532_DEBUG_TX
# define tracetx errdumpbuffer
#else
# define tracetx(x...)
#endif
#ifdef CONFIG_CL_PN532_DEBUG_RX
# define tracerx errdumpbuffer
#else
# define tracerx(x...)
#endif
#define FRAME_SIZE(f) (sizeof(struct pn532_frame) + f->len + 2)
#define FRAME_POSTAMBLE(f) (f->data[f->len + 1])
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
static inline void pn532_configspi(FAR struct spi_dev_s *spi);
static void pn532_lock(FAR struct spi_dev_s *spi);
static void pn532_unlock(FAR struct spi_dev_s *spi);
/* Character driver methods */
static int _open(FAR struct file *filep);
static int _close(FAR struct file *filep);
static ssize_t _read(FAR struct file *, FAR char *, size_t);
static ssize_t _write(FAR struct file *filep, FAR const char *buffer,
size_t buflen);
static int _ioctl(FAR struct file *filep,int cmd,unsigned long arg);
static uint8_t pn532_checksum(uint8_t value);
static uint8_t pn532_data_checksum(uint8_t *data, int datalen);
int pn532_read(struct pn532_dev_s *dev, uint8_t *buff, uint8_t n);
/* IRQ Handling TODO:
static int pn532_irqhandler(FAR int irq, FAR void *context, FAR void* dev);
static inline int pn532_attachirq(FAR struct pn532_dev_s *dev, xcpt_t isr);
*/
/****************************************************************************
* Private Data
****************************************************************************/
static const struct file_operations g_pn532fops =
{
_open,
_close,
_read,
_write,
0,
_ioctl
#ifndef CONFIG_DISABLE_POLL
,0
#endif
#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
,0
#endif
};
static const uint8_t pn532ack[] =
{
0x00, 0x00, 0xFF, 0x00, 0xFF, 0x00
};
/****************************************************************************
* Private Functions
****************************************************************************/
static void pn532_lock(FAR struct spi_dev_s *spi)
{
int ret;
(void)SPI_LOCK(spi, true);
SPI_SETMODE(spi, SPIDEV_MODE0);
SPI_SETBITS(spi, 8);
ret = SPI_HWFEATURES(spi, HWFEAT_LSBFIRST);
if (ret < 0)
{
pn532err("ERROR: SPI_HWFEATURES failed to set bit order: %d\n", ret);
}
(void)SPI_SETFREQUENCY(spi, CONFIG_PN532_SPI_FREQ);
}
static void pn532_unlock(FAR struct spi_dev_s *spi)
{
(void)SPI_LOCK(spi, false);
}
static inline void pn532_configspi(FAR struct spi_dev_s *spi)
{
int ret;
/* Configure SPI for the PN532 module. */
SPI_SETMODE(spi, SPIDEV_MODE0);
SPI_SETBITS(spi, 8);
ret = SPI_HWFEATURES(spi, HWFEAT_LSBFIRST);
if (ret < 0)
{
pn532err("ERROR: SPI_HWFEATURES failed to set bit order: %d\n", ret);
}
(void)SPI_SETFREQUENCY(spi, CONFIG_PN532_SPI_FREQ);
}
static inline void pn532_select(struct pn532_dev_s *dev)
{
if (dev->config->select)
{
dev->config->select(dev, true);
}
else
{
SPI_SELECT(dev->spi, SPIDEV_CONTACTLESS(0), true);
}
}
static inline void pn532_deselect(struct pn532_dev_s *dev)
{
if (dev->config->select)
{
dev->config->select(dev, false);
}
else
{
SPI_SELECT(dev->spi, SPIDEV_CONTACTLESS(0), false);
}
}
static void pn532_frame_init(struct pn532_frame *frame, uint8_t cmd)
{
frame->preamble = PN532_PREAMBLE;
frame->start_code = PN532_SOF;
frame->tfi = PN532_HOSTTOPN532;
frame->data[0] = cmd;
frame->len = 2;
}
static void pn532_frame_finish(struct pn532_frame *frame)
{
frame->lcs = pn532_checksum(frame->len);
frame->data[frame->len-1] = pn532_data_checksum(&frame->tfi, frame->len);
frame->data[frame->len] = PN532_POSTAMBLE;
}
static inline uint8_t pn532_checksum(uint8_t value)
{
return ~value + 1;
}
static uint8_t pn532_data_checksum(uint8_t *data, int datalen)
{
uint8_t sum = 0x00;
int i;
for (i = 0; i < datalen; i++)
{
sum += data[i];
}
return pn532_checksum(sum);
}
bool pn532_rx_frame_is_valid(struct pn532_frame *f, bool check_data)
{
uint8_t chk;
if (f->start_code != PN532_SOF)
{
pn532err("ERROR: Frame startcode 0x%X != 0x%X\n",
PN532_SOF, f->start_code);
return false;
}
if (f->tfi != PN532_PN532TOHOST)
{
return false;
}
chk = pn532_checksum(f->len);
if (chk != f->lcs)
{
pn532err("ERROR: Frame data len checksum failed");
return false;
}
if (check_data)
{
chk = pn532_data_checksum(&f->tfi, f->len);
if (chk != f->data[f->len-1])
{
pn532err("ERROR: Frame data checksum failed: calc=0x%X != 0x%X",
chk, f->data[f->len-1]);
return false;
}
}
return true;
}
static uint8_t pn532_status(struct pn532_dev_s *dev)
{
int rs;
pn532_lock(dev->spi);
pn532_select(dev);
rs = SPI_SEND(dev->spi, PN532_SPI_STATREAD);
rs = SPI_SEND(dev->spi, PN532_SPI_STATREAD);
pn532_deselect(dev);
pn532_unlock(dev->spi);
return rs;
}
/****************************************************************************
* Name: pn532_wait_rx_ready
*
* Description:
* Blocks until Data frame available from chip.
*
* Input Parameters:
* dev
* timeout
*
* Returned Value:
* 0 for OK. -ETIMEDOUT if no data available
*
****************************************************************************/
static int pn532_wait_rx_ready(struct pn532_dev_s *dev, int timeout)
{
int ret = OK;
#ifdef CONFIG_PN532_USE_IRQ_FLOW_CONTROL
struct timespec ts;
clock_gettime(CLOCK_REALTIME, &ts);
ts.tv_sec += 1;
(void)nxsem_timedwait(dev->sem_rx, &ts);
#endif
/* TODO: Handle Exception bits 2, 3 */
while (pn532_status(dev) != PN532_SPI_READY)
{
if (--timeout == 0x00)
{
pn532err("ERROR: wait RX timeout!\n");
return -ETIMEDOUT;
}
nxsig_usleep(1000);
}
dev->state = PN532_STATE_DATA_READY;
return ret;
}
/****************************************************************************
* Name: pn532_writecommand
*
* Description:
* Helper for debug/testing
*
* Input Parameters:
*
* Returned Value:
*
****************************************************************************/
#if 0
static void pn532_writecommand(struct pn532_dev_s *dev, uint8_t cmd)
{
char cmd_buffer[16];
struct pn532_frame *f = (struct pn532_frame *) cmd_buffer;
pn532_frame_init(f, cmd);
pn532_frame_finish(f);
pn532_lock(dev->spi);
pn532_select(dev);
nxsig_usleep(10000);
SPI_SEND(dev->spi, PN532_SPI_DATAWRITE);
SPI_SNDBLOCK(dev->spi, f, FRAME_SIZE(f));
pn532_deselect(dev);
pn532_unlock(dev->spi);
tracetx("command sent", (uint8_t *) f, FRAME_SIZE(f));
}
#endif
/****************************************************************************
* Name: pn532_read
*
* Description:
* RAW Read data from chip.
* NOTE: This WON'T wait if data is available!
*
* Input Parameters:
*
* Returned Value:
*
****************************************************************************/
int pn532_read(struct pn532_dev_s *dev, uint8_t *buff, uint8_t n)
{
pn532_lock(dev->spi);
pn532_select(dev);
SPI_SEND(dev->spi, PN532_SPI_DATAREAD);
SPI_RECVBLOCK(dev->spi, buff, n);
pn532_deselect(dev);
pn532_unlock(dev->spi);
tracerx("read", buff, n);
return n;
}
int pn532_read_more(struct pn532_dev_s *dev, uint8_t *buff, uint8_t n)
{
pn532_lock(dev->spi);
pn532_select(dev);
SPI_RECVBLOCK(dev->spi, buff, n);
pn532_deselect(dev);
pn532_unlock(dev->spi);
tracerx("read_more", buff, n);
return n;
}
/****************************************************************************
* Name: pn532_read_ack
*
* Description:
* Read Ack responce from device
*
* Input Parameters:
* dev
*
* Returned Value:
* 0 = NOK, 1 = OK
*
****************************************************************************/
int pn532_read_ack(struct pn532_dev_s *dev)
{
int res = 0;
uint8_t ack[6];
pn532_read(dev, (uint8_t *) &ack, 6);
if (memcmp(&ack, &pn532ack, 6) == 0x00)
{
res = 1;
}
else
{
pn532info("ACK NOK");
res = 0;
}
return res;
}
/****************************************************************************
* Name: pn532_write_frame
*
* Description:
* Write frame to chip. Also waits and reads ACK frame from chip.
*
* Construct frame with
* pn532_frame_init(), pn532_frame_finish()
*
* Input Parameters:
* dev - Device instance
* f - Pointer to start frame
*
* Returned Value:
* 0 for OK, negative for error
*
****************************************************************************/
int pn532_write_frame(struct pn532_dev_s *dev, struct pn532_frame *f)
{
int res = OK;
pn532_lock(dev->spi);
pn532_select(dev);
nxsig_usleep(2000);
SPI_SEND(dev->spi, PN532_SPI_DATAWRITE);
SPI_SNDBLOCK(dev->spi, f, FRAME_SIZE(f));
pn532_deselect(dev);
pn532_unlock(dev->spi);
tracetx("WriteFrame", (uint8_t *) f, FRAME_SIZE(f));
/* Wait ACK frame */
res = pn532_wait_rx_ready(dev, 30);
if (res == OK)
{
if (!pn532_read_ack(dev))
{
pn532err("ERROR: command FAILED\n");
res = -EIO;
}
}
return res;
}
int pn532_read_frame(struct pn532_dev_s *dev, struct pn532_frame *f, int max_size)
{
int res = -EIO;
/* Wait for frame available */
if ((res = pn532_wait_rx_ready(dev, 100)) == OK)
{
/* Read header */
pn532_read(dev, (uint8_t *) f, sizeof(struct pn532_frame));
if (pn532_rx_frame_is_valid(f, false))
{
if (max_size < f->len)
{
return -EINVAL;
}
pn532_read_more(dev, &f->data[0], f->len);
/* TODO: optimize frame integrity check...
* pn532_data_checksum(&f.tfi, f->len);
* errdumpbuffer("RX Frame:", f, f->len+6);
*/
if (pn532_rx_frame_is_valid(f, true))
{
res = OK;
}
}
}
return res;
}
bool pn532_set_config(struct pn532_dev_s *dev, uint8_t flags)
{
char cmd_buffer[2+7];
struct pn532_frame *f = (struct pn532_frame *) cmd_buffer;
pn532_frame_init(f, PN532_COMMAND_SETPARAMETERS);
f->data[1] = flags;
f->len += 1;
pn532_frame_finish(f);
uint8_t resp[9];
bool res = false;
if (pn532_write_frame(dev, f) == OK)
{
pn532_read(dev, (uint8_t *) &resp, 9);
tracerx("set config responce", resp, 9);
res = true;
}
return res;
}
int pn532_sam_config(struct pn532_dev_s *dev, struct pn_sam_settings_s *settings)
{
char cmd_buffer[4+7];
struct pn532_frame *f = (struct pn532_frame *) cmd_buffer;
int res;
pn532_frame_init(f, PN532_COMMAND_SAMCONFIGURATION);
f->data[1] = PN532_SAM_NORMAL_MODE;
f->data[2] = 0x14; /* Timeout LSB=50ms 0x14*50ms = 1sec */
f->data[3] = 0x01; /* P-70, IRQ enabled */
if (settings)
{
/* TODO: !!! */
}
f->len += 3;
pn532_frame_finish(f);
res = -EIO;
if (pn532_write_frame(dev, f) == OK)
{
if (pn532_read_frame(dev, f, 4) == OK)
{
tracerx("sam config response", (uint8_t *) f->data, 3);
if (f->data[0] == PN532_COMMAND_SAMCONFIGURATION + 1)
{
res = OK;
}
}
}
return res;
}
int pn532_get_fw_version(struct pn532_dev_s *dev,
struct pn_firmware_version *fv)
{
uint8_t cmd_buffer[4+8+1];
struct pn532_frame *f = (struct pn532_frame *) cmd_buffer;
struct pn_firmware_version *fw;
int res = -EIO;
pn532_frame_init(f, PN532_COMMAND_GETFIRMWAREVERSION);
pn532_frame_finish(f);
if (pn532_write_frame(dev, f) == OK)
{
if (pn532_read_frame(dev, f, 6) == OK)
{
if (f->data[0] == PN532_COMMAND_GETFIRMWAREVERSION + 1)
{
fw = (struct pn_firmware_version*) &f->data[1];
pn532info("FW: %d.%d on IC:0x%X (Features: 0x%X)\n",
fw->ver, fw->rev, fw->ic, fw->support);
if (fv)
{
memcpy(fv, fw, sizeof(struct pn_firmware_version));
}
res = OK;
}
}
}
return res;
}
int pn532_write_gpio(struct pn532_dev_s *dev, uint8_t p3, uint8_t p7)
{
uint8_t cmd_buffer[3+7];
struct pn532_frame *f = (struct pn532_frame *) cmd_buffer;
int res = -EIO;
pn532_frame_init(f, PN532_COMMAND_WRITEGPIO);
f->data[1] = p3;
f->data[2] = p7;
f->len += 2;
pn532_frame_finish(f);
if (pn532_write_frame(dev, f))
{
pn532_read(dev, cmd_buffer, 10);
tracetx("Resp:", cmd_buffer, 10);
pn532info("TFI=%x, data0=%X", f->tfi, f->data[0]);
if ((f->tfi == PN532_PN532TOHOST) && (f->data[0] == PN532_COMMAND_WRITEGPIO+1))
{
res = OK;
}
}
return res;
}
uint32_t pn532_write_passive_data(struct pn532_dev_s *dev, uint8_t address,
uint8_t *data, uint8_t len)
{
uint8_t cmd_buffer[8+7];
struct pn532_frame *f = (struct pn532_frame *) cmd_buffer;
uint8_t resp[20];
uint32_t res = -EIO;
pn532_frame_init(f, PN532_COMMAND_INDATAEXCHANGE);
f->data[1] = 1; /* max n cards at once */
f->data[2] = 0xA2; /* command WRITE */
f->data[3] = address; /* ADDRESS, 0 = serial */
memcpy(&f->data[4], data, len);
f->len += 7;
pn532_frame_finish(f);
if (pn532_write_frame(dev, f) == OK)
{
if (dev->state == PN532_STATE_DATA_READY)
{
if (pn532_read_frame(dev, (struct pn532_frame *) resp, 15) == OK)
{
dev->state = PN532_STATE_IDLE;
f = (struct pn532_frame *) resp;
tracerx("passive target id resp:", f, f->len+6);
if (f->data[0] == PN532_COMMAND_INDATAEXCHANGE+1)
{
res = f->data[1];
}
}
}
}
return res;
}
uint32_t pn532_read_passive_data(struct pn532_dev_s *dev, uint8_t address,
uint8_t *data, uint8_t len)
{
uint8_t cmd_buffer[4+7];
struct pn532_frame *f = (struct pn532_frame *) cmd_buffer;
uint8_t resp[30];
uint32_t res = -1;
pn532_frame_init(f, PN532_COMMAND_INDATAEXCHANGE);
f->data[1] = 1; /* max n cards at once */
f->data[2] = 0x30; /* command READ */
f->data[3] = address; /* ADDRESS, 0 = serial */
f->len += 3;
pn532_frame_finish(f);
if (pn532_write_frame(dev, f) == OK)
{
if (dev->state == PN532_STATE_DATA_READY)
{
if (pn532_read_frame(dev, (struct pn532_frame *)resp, 25) == OK)
{
dev->state = PN532_STATE_IDLE;
f = (struct pn532_frame *) resp;
tracerx("passive target id resp:", f, f->len+6);
if (f->data[0] == PN532_COMMAND_INDATAEXCHANGE+1)
{
if(f->data[1] == 0 && data && len)
{
memcpy(data, &f->data[2], len);
}
res = f->data[1];
}
}
}
}
return res;
}
uint32_t pn532_read_passive_target_id(struct pn532_dev_s *dev, uint8_t baudrate)
{
uint8_t cmd_buffer[4+7];
struct pn532_frame *f = (struct pn532_frame *) cmd_buffer;
uint8_t resp[20];
uint32_t res = -EAGAIN;
int i;
if (dev->state == PN532_STATE_DATA_READY)
{
res = -EIO;
if (pn532_read_frame(dev, (struct pn532_frame *) resp, 15) == OK)
{
dev->state = PN532_STATE_IDLE;
f = (struct pn532_frame *) resp;
struct pn_poll_response *r = (struct pn_poll_response *) &f->data[1];
tracerx("passive target id resp:", f, f->len+6);
if (f->data[0] == PN532_COMMAND_INLISTPASSIVETARGET+1)
{
uint32_t cid = 0;
if (r->nbtg == 1)
{
pn532info("Found %d card(s)\n", r->nbtg);
/* now supports only type_a cards
* if (poll_mode == PN532_POLL_MOD_106KBPS_A)
*/
struct pn_target_type_a *t = (struct pn_target_type_a *) &r->target_data;
pn532info("sens:0x%x sel:0x%x", t->sens_res, t->sel_res);
pn532info("idlen:0x%x ", t->nfcid_len);
/* generate 32bit cid from id (could be longer)
* HACK: Using only top 4 bytes.
*/
for (i = 0; i < 4 /*t->nfcid_len*/; i++)
{
cid <<= 8;
cid |= t->nfcid_data[i];
}
}
res = cid;
}
}
}
return res;
}
static int pn532_read_passive_target(struct pn532_dev_s *dev, uint8_t baudrate)
{
uint8_t cmd_buffer[4+7];
struct pn532_frame *f = (struct pn532_frame *) cmd_buffer;
pn532_frame_init(f, PN532_COMMAND_INLISTPASSIVETARGET);
f->data[1] = 1;
f->data[2] = baudrate;
f->len += 2;
pn532_frame_finish(f);
return pn532_write_frame(dev, f);
}
bool pn532_set_rf_config(struct pn532_dev_s *dev, struct pn_rf_config_s *conf)
{
bool res = false;
uint8_t cmd_buffer[15+7];
struct pn532_frame *f = (struct pn532_frame *) cmd_buffer;
pn532_frame_init(f, PN532_COMMAND_RFCONFIGURATION);
f->data[1] = conf->cfg_item;
memcpy(&f->data[2], conf->config, conf->data_size);
f->len += conf->data_size+1;
pn532_frame_finish(f);
if (pn532_write_frame(dev, f) == OK)
{
pn532_read(dev, (uint8_t *) f, 10);
tracerx("rf config response", (uint8_t *) f, 10);
if (pn532_rx_frame_is_valid(f, true))
{
if (f->data[0] == PN532_COMMAND_RFCONFIGURATION + 1)
{
res = true;
}
}
}
return res;
}
/****************************************************************************
* Name: pn532_attachirq
*
* Description:
* IRQ handling TODO:
*
* Input Parameters:
*
* Returned Value:
*
****************************************************************************/
#if 0
static inline int (FAR struct pn532_dev_s *dev, xcpt_t isr)
{
return dev->config->irqattach(dev,isr);
}
static int irq_handler(int irq, FAR void *context)
{
(void) irq;
(void) context;
/* pn532info("*IRQ*\n"); */
/* work_queue(HPWORK, &g_dev->irq_work, pn532_worker, dev, 0); */
return OK;
}
#endif
/****************************************************************************
* Name: pn532_open
*
* Description:
* This function is called whenever the PN532 device is opened.
*
****************************************************************************/
static int _open(FAR struct file *filep)
{
FAR struct inode *inode;
FAR struct pn532_dev_s *dev;
DEBUGASSERT(filep);
inode = filep->f_inode;
DEBUGASSERT(inode && inode->i_private);
dev = inode->i_private;
pn532_configspi(dev->spi);
dev->config->reset(1);
nxsig_usleep(10000);
pn532_sam_config(dev, NULL);
pn532_get_fw_version(dev, NULL);
dev->state = PN532_STATE_IDLE;
return OK;
}
/****************************************************************************
* Name: _close
*
* Description:
* This routine is called when the PN532 device is closed.
*
****************************************************************************/
static int _close(FAR struct file *filep)
{
FAR struct inode *inode;
FAR struct pn532_dev_s *dev;
DEBUGASSERT(filep);
inode = filep->f_inode;
DEBUGASSERT(inode && inode->i_private);
dev = inode->i_private;
dev->config->reset(0);
dev->state = PN532_STATE_NOT_INIT;
#ifdef CONFIG_PM
if(dev->pm_level >= PM_SLEEP)
{
//priv->config->reset(0);
}
#endif
return OK;
}
/****************************************************************************
* Name: _read
*
* Description:
* This routine is called when the device is read.
*
* Returns TAG id as string to buffer.
* or -EIO if no TAG found
*
****************************************************************************/
static ssize_t _read(FAR struct file *filep, FAR char *buffer, size_t buflen)
{
FAR struct inode *inode;
FAR struct pn532_dev_s *dev;
DEBUGASSERT(filep);
inode = filep->f_inode;
DEBUGASSERT(inode && inode->i_private);
dev = inode->i_private;
uint32_t id = pn532_read_passive_target_id(dev, PN532_MIFARE_ISO14443A);
if (id != 0xFFFFFFFF)
{
if (buffer)
{
return snprintf(buffer, buflen, "0X%X", id);
}
}
return -EIO;
}
/****************************************************************************
* Name: pn532_write
****************************************************************************/
static ssize_t _write(FAR struct file *filep, FAR const char *buffer,
size_t buflen)
{
FAR struct inode *inode;
FAR struct pn532_dev_s *dev;
DEBUGASSERT(filep);
inode = filep->f_inode;
DEBUGASSERT(inode && inode->i_private);
dev = inode->i_private;
(void) dev;
return -ENOSYS;
}
/****************************************************************************
* Name: pn532_ioctl
****************************************************************************/
static int _ioctl(FAR struct file *filep, int cmd, unsigned long arg)
{
FAR struct inode *inode;
FAR struct pn532_dev_s *dev;
int ret = OK;
DEBUGASSERT(filep);
inode = filep->f_inode;
DEBUGASSERT(inode && inode->i_private);
dev = inode->i_private;
switch (cmd)
{
case PN532IOC_READ_TAG_DATA:
{
struct pn_mifare_tag_data_s *tag_data = (struct pn_mifare_tag_data_s *) arg;
if (tag_data)
{
/* HACK: get rid of previous command */
if (dev->state == PN532_STATE_CMD_SENT)
{
if (pn532_wait_rx_ready(dev, 1))
{
pn532_read_passive_target_id(dev,0);
}
}
ret = pn532_read_passive_data(dev, tag_data->address,
(uint8_t *) &tag_data->data,
sizeof(tag_data->data));
dev->state = PN532_STATE_IDLE;
}
}
break;
case PN532IOC_WRITE_TAG_DATA:
{
struct pn_mifare_tag_data_s *tag_data = (struct pn_mifare_tag_data_s *) arg;
if (tag_data)
{
/* HACK: get rid of previous command */
if (dev->state == PN532_STATE_CMD_SENT)
{
if (pn532_wait_rx_ready(dev, 1))
{
pn532_read_passive_target_id(dev,0);
}
}
ret = pn532_write_passive_data(dev, tag_data->address,
(uint8_t *) &tag_data->data,
sizeof(tag_data->data));
dev->state = PN532_STATE_IDLE;
}
}
break;
case PN532IOC_SET_SAM_CONF:
pn532_sam_config(dev, (struct pn_sam_settings_s *) arg);
break;
case PN532IOC_READ_PASSIVE:
if (dev->state == PN532_STATE_CMD_SENT)
{
uint32_t *ptr = (uint32_t *)((uintptr_t)arg);
*ptr = pn532_read_passive_target_id(dev,0);
}
else
{
uint32_t *ptr = (uint32_t *)((uintptr_t)arg);
*ptr = -1;
}
break;
case PN532IOC_SET_RF_CONF:
pn532_set_rf_config(dev, (struct pn_rf_config_s *) arg);
break;
case PN532IOC_SEND_CMD_READ_PASSIVE:
ret = pn532_read_passive_target(dev,0);
if (ret == 0)
{
dev->state = PN532_STATE_CMD_SENT;
}
else
{
dev->state = PN532_STATE_IDLE;
}
break;
case PN532IOC_GET_DATA_READY:
if (pn532_wait_rx_ready(dev, 1))
{
ret = 0;
}
else
{
ret = 1;
}
break;
case PN532IOC_GET_TAG_ID:
{
uint32_t *ptr = (uint32_t *)((uintptr_t)arg);
*ptr = pn532_read_passive_target_id(dev,0);
}
break;
case PN532IOC_GET_STATE:
ret = dev->state;
break;
default:
pn532err("ERROR: Unrecognized cmd: %d\n", cmd);
ret = -EINVAL;
break;
}
return ret;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: pn532_register
*
* Description:
* Register the PN532 character device as 'devpath'
*
* Input Parameters:
* devpath - The full path to the driver to register.
* E.g., "/dev/nfc0"
* spi - An instance of the SPI interface to use to communicate with
* PN532.
* config - chip config
*
* Returned Value:
* Zero (OK) on success; a negated errno value on failure.
*
****************************************************************************/
int pn532_register(FAR const char *devpath, FAR struct spi_dev_s *spi,
FAR struct pn532_config_s *config)
{
FAR struct pn532_dev_s *dev;
int ret;
/* Initialize the PN532 device structure */
dev = (FAR struct pn532_dev_s *)kmm_malloc(sizeof(struct pn532_dev_s));
if (!dev)
{
pn532err("ERROR: Failed to allocate instance\n");
return -ENOMEM;
}
dev->spi = spi;
dev->config = config;
#if defined CONFIG_PM
dev->pm_level = PM_IDLE;
#endif
/* pn532_attachirq(dev, pn532_irqhandler); */
/* Register the character driver */
ret = register_driver(devpath, &g_pn532fops, 0666, dev);
if (ret < 0)
{
pn532err("ERROR: Failed to register driver: %d\n", ret);
kmm_free(dev);
}
return ret;
}
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