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rfm12b.c
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/* rfm12b-linux: linux kernel driver for the rfm12(b) RF module by HopeRF
* Copyright (C) 2013 Georg Kaindl
*
* This file is part of rfm12b-linux.
*
* rfm12b-linux is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* rfm12b-linux is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with rfm12b-linux. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/init.h>
#include <linux/miscdevice.h>
#include <linux/sched.h>
#include <linux/delay.h>
#include <linux/poll.h>
#include <linux/spi/spi.h>
#define BUILD_MODULE 1
#include "rfm12b_config.h"
#if defined(MODULE_BOARD_CONFIGURED)
#include "rfm12b_ioctl.h"
#include "rfm12b_jeenode.h"
#include "iolib.h"
#include "rxtx.h"
static u8 group_id = RFM12B_DEFAULT_GROUP_ID;
static u8 band_id = RFM12B_DEFAULT_BAND_ID;
static u8 bit_rate = RFM12B_DEFAULT_BIT_RATE;
static u8 jee_id = RFM12B_DEFAULT_JEE_ID;
static u8 jee_autoack = RFM12B_DEFAULT_JEE_AUTOACK;
module_param(group_id, byte, 0000);
MODULE_PARM_DESC(group_id,
"group ID for rfm12b modules. can be changed per board via ioctl().");
module_param(band_id, byte, 0000);
MODULE_PARM_DESC(band_id,
"band ID for rfm12b modules. can be changed per board via ioctl(). "
"1 .. 433mhz; 2 .. 868mhz; 3 .. 915mhz");
module_param(bit_rate, byte, 0000);
MODULE_PARM_DESC(bit_rate,
"bit rate setting byte for rfm12b modules (see datasheet). "
"can be changed per board via ioctl().");
module_param(jee_id, byte, 0000);
MODULE_PARM_DESC(jee_id,
"jeenode id for rfm12b modules, or 0 to disable the jee protocol. this "
"can be changed per board via ioctl().");
module_param(jee_autoack, byte, 0000);
MODULE_PARM_DESC(jee_autoack,
"if the jee-protocol is enabled by setting a jee-id, enable or disable "
"the automated sending of ACKs when a packet requests them. Can also be "
"changed per board via ioctl().");
#define RF_READ_STATUS 0x0000
#define RF_IDLE_MODE 0x820D
#define RF_SLEEP_MODE 0x8205
#define RF_TXREG_WRITE 0xB800
#define RF_RECEIVER_ON 0x82DD
#define RF_XMITTER_ON 0x823D
#define RF_RX_FIFO_READ 0xB000
#define RF_STATUS_BIT_LBAT (0x0400)
#define RF_STATUS_BIT_FFEM (0x0200)
#define RF_STATUS_BIT_FFOV_RGUR (0x2000)
#define RF_STATUS_BIT_RSSI (0x0100)
#define RF_STATUS_BIT_FFIT_RGIT (0x8000)
#define RF_MAX_DATA_LEN 66
#define RF_EXTRA_LEN 4 // 4 : 1 byte hdr, 1 byte len, 2 bytes crc16 (see JeeLib)
#define RF_MAX_LEN (RF_MAX_DATA_LEN+RF_EXTRA_LEN)
#define OPEN_WAIT_MILLIS (100)
#define READ_FIFO_WAIT (0)
#define WRITE_TX_WAIT (0)
#define RXTX_WATCHDOG_JIFFIES (HZ/4)
#define TRYSEND_RETRY_JIFFIES (HZ/16)
#define DATA_BUF_SIZE (512)
#define NUM_MAX_CONCURRENT_MSG (3)
#define INTERPRETS_JEENODE_PROTOCOL(rfm12) (0 != (rfm12)->jee_id)
#define CAN_SEND_BYTES_OF_LENGTH(LEN) \
(DATA_BUF_SIZE - (rfm12->out_cur_end - rfm12->out_buf) >= (LEN) + RF_EXTRA_LEN)
static LIST_HEAD(device_list);
static DEFINE_MUTEX(device_list_lock);
static DECLARE_BITMAP(minors, RFM12B_NUM_SPI_MINORS);
typedef enum _rfm12_state_t {
RFM12_STATE_NO_CHANGE = 0,
RFM12_STATE_CONFIG = 1,
RFM12_STATE_SLEEP = 2,
RFM12_STATE_IDLE = 3,
RFM12_STATE_LISTEN = 4,
RFM12_STATE_RECV = 5,
RFM12_STATE_RECV_FINISH = 6,
RFM12_STATE_SEND_PRE1 = 7,
RFM12_STATE_SEND_PRE2 = 8,
RFM12_STATE_SEND_PRE3 = 9,
RFM12_STATE_SEND_SYN1 = 10,
RFM12_STATE_SEND_SYN2 = 11,
RFM12_STATE_SEND = 12,
RFM12_STATE_SEND_TAIL1 = 13,
RFM12_STATE_SEND_TAIL2 = 14,
RFM12_STATE_SEND_TAIL3 = 15
} rfm12_state_t;
struct rfm12_spi_message {
struct spi_message spi_msg;
struct spi_transfer spi_transfers[4];
rfm12_state_t spi_finish_state;
u8 spi_tx[8], spi_rx[8];
void* context;
u8 pos;
};
struct rfm12_data {
u16 irq;
void* irq_identifier;
dev_t devt;
spinlock_t lock;
struct spi_device* spi;
struct list_head device_entry;
u8 open, should_release, trysend;
rfm12_state_t state;
u8 group_id, band_id, bit_rate, jee_id, jee_autoack;
unsigned long bytes_recvd, pkts_recvd;
unsigned long bytes_sent, pkts_sent;
unsigned long num_recv_overflows, num_recv_timeouts, num_recv_crc16_fail;
unsigned long num_send_underruns, num_send_timeouts;
u8* in_buf, *in_buf_pos;
u8* out_buf, *out_buf_pos;
u8* in_cur_len_pos;
u8* in_cur_end, *out_cur_end;
u16 crc16, last_status;
int in_cur_num_bytes, out_cur_num_bytes;
struct rfm12_spi_message spi_msgs[NUM_MAX_CONCURRENT_MSG];
u8 free_spi_msgs;
struct timer_list rxtx_watchdog;
u8 rxtx_watchdog_running;
struct timer_list retry_sending_timer;
u8 retry_sending_running;
wait_queue_head_t wait_read;
wait_queue_head_t wait_write;
// TX parameters
u16 tx_freq_off_12;
u8 tx_power_3;
u8 tx_bandwidth_4;
};
// forward declarations
static void
rfm12_handle_interrupt(struct rfm12_data* rfm12);
static int
rfm12_request_fifo_byte(struct rfm12_data* rfm12);
static int
rfm12_finish_receiving(struct rfm12_data* rfm12, int skip_packet);
static int
rfm12_finish_sending(struct rfm12_data* rfm12, int success);
static void
rfm12_begin_sending_or_receiving(struct rfm12_data* rfm12);
static int
rfm12_try_sending(struct rfm12_data* rfm12);
static void
rfm12_update_rxtx_watchdog(struct rfm12_data* rfm12, u8 cancelTimer);
static int
rfm12_reset(struct rfm12_data* rfm12);
static void
rfm12_apply_crc16(struct rfm12_data* rfm12, unsigned char* ptr, unsigned len);
// 3.8 kernels and later make these obsolete due to changes in HOTPLUG
// we keep them for compatibility with earlier kernel versions...
#ifndef __devinit
#define __devinit
#endif
#ifndef __devexit
#define __devexit
#endif
#ifndef __devexit_p
#define __devexit_p(x) x
#endif
static struct rfm12_spi_message*
rfm12_claim_spi_message(struct rfm12_data* rfm12)
{
u8 i;
struct rfm12_spi_message* rv = NULL;
for (i=0; i < NUM_MAX_CONCURRENT_MSG; i++) {
if (0 == (rfm12->free_spi_msgs & (1 << i))) {
rfm12->free_spi_msgs |= (1 << i);
rv = &rfm12->spi_msgs[i];
rv->pos = i;
rv->context = rfm12;
break;
}
}
return rv;
}
static void
rfm12_unclaim_spi_message(struct rfm12_spi_message* spi_msg)
{
struct rfm12_data* rfm12 =
(struct rfm12_data*)spi_msg->context;
rfm12->free_spi_msgs &= ~(1 << spi_msg->pos);
}
struct spi_transfer
rfm12_make_spi_transfer(uint16_t cmd, u8* tx_buf, u8* rx_buf)
{
struct spi_transfer tr = {
.tx_buf = tx_buf,
.rx_buf = rx_buf,
.len = 2,
.cs_change = 0,
.bits_per_word = 0,
.delay_usecs = 0,
.speed_hz = 0
};
tx_buf[0] = (cmd >> 8) & 0xff;
tx_buf[1] = cmd & 0xff;
return tr;
}
struct spi_transfer
rfm12_control_spi_transfer(struct rfm12_spi_message* msg,
u8 pos, uint16_t cmd)
{
return rfm12_make_spi_transfer(cmd,
msg->spi_tx + 2*pos,
msg->spi_rx + 2*pos);
}
static void
rfm12_spi_completion_common(struct rfm12_spi_message* msg)
{
rfm12_unclaim_spi_message(msg);
}
static void
__rfm12_generic_spi_completion_handler(void *arg)
{
struct rfm12_spi_message* spi_msg =
(struct rfm12_spi_message*)arg;
struct rfm12_data* rfm12 =
(struct rfm12_data*)spi_msg->context;
if (RFM12_STATE_NO_CHANGE != spi_msg->spi_finish_state)
rfm12->state = spi_msg->spi_finish_state;
rfm12_spi_completion_common(spi_msg);
}
static void
rfm12_generic_spi_completion_handler(void *arg)
{
unsigned long flags;
struct rfm12_spi_message* spi_msg =
(struct rfm12_spi_message*)arg;
struct rfm12_data* rfm12 =
(struct rfm12_data*)spi_msg->context;
spin_lock_irqsave(&rfm12->lock, flags);
__rfm12_generic_spi_completion_handler(arg);
spin_unlock_irqrestore(&rfm12->lock, flags);
}
static int
rfm12_send_generic_async_cmd(struct rfm12_data* rfm12, uint16_t* cmds,
int num_cmds, uint16_t delay_usecs,
void (*callback)(void*),
rfm12_state_t finish_state)
{
int err, i;
struct rfm12_spi_message* spi_msg;
spi_msg = rfm12_claim_spi_message(rfm12);
if (NULL == spi_msg)
return -EBUSY;
spi_msg->spi_finish_state = finish_state;
spi_message_init(&spi_msg->spi_msg);
spi_msg->spi_msg.complete =
(NULL == callback) ? rfm12_generic_spi_completion_handler : callback;
spi_msg->spi_msg.context = (void*)spi_msg;
spi_msg->spi_transfers[0] =
rfm12_control_spi_transfer(spi_msg, 0, cmds[0]);
i=1;
if (num_cmds > 1) {
for (i=1; i<num_cmds; i++) {
spi_msg->spi_transfers[i-1].cs_change = 1;
spi_msg->spi_transfers[i-1].delay_usecs = delay_usecs;
spi_message_add_tail(&spi_msg->spi_transfers[i-1], &spi_msg->spi_msg);
spi_msg->spi_transfers[i] =
rfm12_control_spi_transfer(spi_msg, i, cmds[i]);
}
}
spi_message_add_tail(&spi_msg->spi_transfers[i-1], &spi_msg->spi_msg);
err = spi_async(rfm12->spi, &spi_msg->spi_msg);
if (err)
__rfm12_generic_spi_completion_handler((void*)spi_msg);
return err;
}
static u16
rfm12_crc16_update(u16 crc, u8 b)
{
int i=0;
crc ^= b;
for (i = 0; i < 8; ++i) {
if (crc & 1)
crc = (crc >> 1) ^ 0xa001;
else
crc = (crc >> 1);
}
return crc;
}
static int
rfm12_start_receiving(struct rfm12_data* rfm12)
{
int err;
uint16_t cmd[2];
rfm12->state = RFM12_STATE_LISTEN;
// read the fifo before listening to make sure it's empty
cmd[0] = RF_RX_FIFO_READ;
cmd[1] = RF_RECEIVER_ON;
err = rfm12_send_generic_async_cmd(rfm12, cmd, 2, 0,
NULL, RFM12_STATE_NO_CHANGE);
if (0 == err) {
rfm12->in_cur_num_bytes = 0;
}
return err;
}
static int
rfm12_setup(struct rfm12_data* rfm12)
{
struct spi_transfer tr, tr2, tr3, tr4, tr5, tr6, tr7, tr8, tr9,
tr10, tr11, tr12, tr13;
struct spi_message msg;
u8 tx_buf[30];
int err;
rfm12->state = RFM12_STATE_CONFIG;
spi_message_init(&msg);
tr = rfm12_make_spi_transfer(RF_READ_STATUS, tx_buf+0, NULL);
tr.cs_change = 1;
spi_message_add_tail(&tr, &msg);
tr2 = rfm12_make_spi_transfer(RF_SLEEP_MODE, tx_buf+2, NULL);
tr2.cs_change = 1;
spi_message_add_tail(&tr2, &msg);
tr3 = rfm12_make_spi_transfer(RF_TXREG_WRITE, tx_buf+4, NULL);
spi_message_add_tail(&tr3, &msg);
err = spi_sync(rfm12->spi, &msg);
if (err)
goto pError;
msleep(OPEN_WAIT_MILLIS);
// ok, we're now ready to be configured.
spi_message_init(&msg);
tr = rfm12_make_spi_transfer(0x80E7 |
((rfm12->band_id & 0xff) << 4), tx_buf+0, NULL);
tr.cs_change = 1;
spi_message_add_tail(&tr, &msg);
tr2 = rfm12_make_spi_transfer(0xA000 | (rfm12->tx_freq_off_12 & 0x5FFF), tx_buf+2, NULL);
tr2.cs_change = 1;
spi_message_add_tail(&tr2, &msg);
tr3 = rfm12_make_spi_transfer(0xC600 | rfm12->bit_rate, tx_buf+4, NULL);
tr3.cs_change = 1;
spi_message_add_tail(&tr3, &msg);
tr4 = rfm12_make_spi_transfer(0x94A2, tx_buf+6, NULL);
tr4.cs_change = 1;
spi_message_add_tail(&tr4, &msg);
tr5 = rfm12_make_spi_transfer(0xC2AC, tx_buf+8, NULL);
tr5.cs_change = 1;
spi_message_add_tail(&tr5, &msg);
if (0 != rfm12->group_id) {
tr6 = rfm12_make_spi_transfer(0xCA83, tx_buf+10, NULL);
tr6.cs_change = 1;
spi_message_add_tail(&tr6, &msg);
tr7 = rfm12_make_spi_transfer(0xCE00 |
rfm12->group_id, tx_buf+12, NULL);
tr7.cs_change = 1;
spi_message_add_tail(&tr7, &msg);
} else {
tr6 = rfm12_make_spi_transfer(0xCA8B, tx_buf+10, NULL);
tr6.cs_change = 1;
spi_message_add_tail(&tr6, &msg);
tr7 = rfm12_make_spi_transfer(0xCE2D, tx_buf+12, NULL);
tr7.cs_change = 1;
spi_message_add_tail(&tr7, &msg);
}
tr8 = rfm12_make_spi_transfer(0xC483, tx_buf+14, NULL);
tr8.cs_change = 1;
spi_message_add_tail(&tr8, &msg);
tr9 = rfm12_make_spi_transfer(0x9800 | ((rfm12->tx_bandwidth_4 & 0xF) << 4) | (rfm12->tx_power_3 & 0x7), tx_buf+16, NULL);
tr9.cs_change = 1;
spi_message_add_tail(&tr9, &msg);
tr10 = rfm12_make_spi_transfer(0xCC77, tx_buf+18, NULL);
tr10.cs_change = 1;
spi_message_add_tail(&tr10, &msg);
tr11 = rfm12_make_spi_transfer(0xE000, tx_buf+20, NULL);
tr11.cs_change = 1;
spi_message_add_tail(&tr11, &msg);
tr12 = rfm12_make_spi_transfer(0xC800, tx_buf+22, NULL);
tr12.cs_change = 1;
spi_message_add_tail(&tr12, &msg);
// set low battery threshold to 2.9V
tr13 = rfm12_make_spi_transfer(0xC047, tx_buf+24, NULL);
spi_message_add_tail(&tr13, &msg);
err = spi_sync(rfm12->spi, &msg);
if (0 == err) {
spi_message_init(&msg);
tr = rfm12_make_spi_transfer(RF_READ_STATUS, tx_buf+0, NULL);
spi_message_add_tail(&tr, &msg);
err = spi_sync(rfm12->spi, &msg);
}
printk(KERN_INFO RFM12B_DRV_NAME
": transceiver <0x%x> settings now: group %d, band %d, bit rate 0x%.2x (%d bps), "
"jee id: %d, jee autoack: %d.\n",
(unsigned)rfm12->irq_identifier, rfm12->group_id, rfm12->band_id,
rfm12->bit_rate, RFM12B_BIT_RATE_FROM_BYTE(rfm12->bit_rate),
rfm12->jee_id, rfm12->jee_autoack);
pError:
rfm12->state = RFM12_STATE_IDLE;
return err;
}
static int
rfm12_reset(struct rfm12_data* rfm12)
{
rfm12_setup(rfm12);
rfm12_begin_sending_or_receiving(rfm12);
return 0;
}
static void
rfm12_release_when_safe_sleep_mode_handler(void *arg)
{
unsigned long flags;
int dofree = 0;
struct rfm12_spi_message* spi_msg =
(struct rfm12_spi_message*)arg;
struct rfm12_data* rfm12 =
(struct rfm12_data*)spi_msg->context;
spin_lock_irqsave(&rfm12->lock, flags);
rfm12_spi_completion_common(spi_msg);
kfree(rfm12->in_buf);
rfm12->in_buf = rfm12->in_buf_pos = NULL;
rfm12->out_buf = rfm12->out_buf_pos = NULL;
dofree = (rfm12->spi == NULL);
spin_unlock_irqrestore(&rfm12->lock, flags);
if (dofree) {
kfree(rfm12);
}
}
static void
rfm12_release_when_safe(struct rfm12_data* rfm12)
{
uint16_t cmd;
rfm12->should_release = 0;
platform_irq_cleanup(rfm12->irq_identifier);
rfm12_update_rxtx_watchdog(rfm12, 1);
cmd = RF_SLEEP_MODE;
(void)rfm12_send_generic_async_cmd(rfm12, &cmd, 1,
0, rfm12_release_when_safe_sleep_mode_handler, RFM12_STATE_NO_CHANGE);
}
static void
rfm12_rxtx_watchdog_expired(unsigned long ptr)
{
unsigned long flags;
struct rfm12_data* rfm12 = (struct rfm12_data*)ptr;
spin_lock_irqsave(&rfm12->lock, flags);
if (RFM12_STATE_RECV >= rfm12->state &&
RFM12_STATE_LISTEN <= rfm12->state) {
rfm12->num_recv_timeouts++;
(void)rfm12_finish_receiving(rfm12, 1);
} else if (RFM12_STATE_SEND_PRE1 <= rfm12->state &&
RFM12_STATE_SEND_TAIL3 >= rfm12->state) {
rfm12->num_send_timeouts++;
(void)rfm12_finish_sending(rfm12, 0);
}
rfm12->rxtx_watchdog_running = 0;
spin_unlock_irqrestore(&rfm12->lock, flags);
}
static void
rfm12_update_rxtx_watchdog(struct rfm12_data* rfm12, u8 cancelTimer)
{
if (rfm12->rxtx_watchdog_running) {
if (cancelTimer) {
// not del_timer_sync, because we might be called within our
// own expiration handler
del_timer(&rfm12->rxtx_watchdog);
rfm12->rxtx_watchdog_running = 0;
} else
mod_timer(&rfm12->rxtx_watchdog,
jiffies + RXTX_WATCHDOG_JIFFIES);
} else if (!cancelTimer) {
init_timer(&rfm12->rxtx_watchdog);
rfm12->rxtx_watchdog.expires = jiffies + RXTX_WATCHDOG_JIFFIES;
rfm12->rxtx_watchdog.data = (unsigned long)rfm12;
rfm12->rxtx_watchdog.function = rfm12_rxtx_watchdog_expired;
add_timer(&rfm12->rxtx_watchdog);
rfm12->rxtx_watchdog_running = 1;
}
}
static void
rfm12_finish_send_or_recv_callback(void *arg)
{
unsigned long flags;
struct rfm12_spi_message* spi_msg =
(struct rfm12_spi_message*)arg;
struct rfm12_data* rfm12 =
(struct rfm12_data*)spi_msg->context;
u8 should_release = 0;
spin_lock_irqsave(&rfm12->lock, flags);
rfm12_spi_completion_common(spi_msg);
if ((should_release = rfm12->should_release)) {
spin_unlock_irqrestore(&rfm12->lock, flags);
rfm12_release_when_safe(rfm12);
spin_lock_irqsave(&rfm12->lock, flags);
} else {
rfm12_begin_sending_or_receiving(rfm12);
}
spin_unlock_irqrestore(&rfm12->lock, flags);
if (!should_release)
platform_irq_handled(rfm12->irq_identifier);
}
static int
rfm12_finish_send_recv_common(struct rfm12_data* rfm12)
{
uint16_t cmds[3];
cmds[0] = RF_READ_STATUS;
cmds[1] = RF_IDLE_MODE;
cmds[2] = RF_TXREG_WRITE | 0xAA;
rfm12->state = RFM12_STATE_IDLE;
return rfm12_send_generic_async_cmd(rfm12, cmds, 3,
0, rfm12_finish_send_or_recv_callback, RFM12_STATE_NO_CHANGE);
}
static int
rfm12_finish_receiving(struct rfm12_data* rfm12, int skip_packet)
{
int err = 0, num_bytes;
if (RFM12_STATE_RECV == rfm12->state) {
rfm12->state = RFM12_STATE_RECV_FINISH;
num_bytes = rfm12->in_cur_num_bytes;
rfm12->in_cur_num_bytes = 0;
rfm12_update_rxtx_watchdog(rfm12, 1);
if (0 == skip_packet && 0 == rfm12->crc16) {
rfm12->pkts_recvd++;
rfm12->bytes_recvd += num_bytes - 3;
// if we are in jeenode-compatible mode and this packet
// needs an ACK, we send one automatically to the source node.
if (INTERPRETS_JEENODE_PROTOCOL(rfm12) && rfm12->jee_autoack && CAN_SEND_BYTES_OF_LENGTH(0)) {
u8 hdr = rfm12->in_cur_len_pos[-1];
if ((hdr & RFM12B_JEE_HDR_ACK_BIT) && !(hdr & RFM12B_JEE_HDR_CTL_BIT)) {
u8 snd_hdr = 0;
if (hdr & RFM12B_JEE_HDR_DST_BIT) {
// if this was only sent to us, send ACK as broadcast
snd_hdr |= RFM12B_JEE_HDR_CTL_BIT | RFM12B_JEE_ID_FROM_HDR(rfm12->jee_id);
} else {
// if this was a broadcast, send ACK directly to source node.
snd_hdr |= RFM12B_JEE_HDR_CTL_BIT | RFM12B_JEE_HDR_DST_BIT |
RFM12B_JEE_ID_FROM_HDR(hdr);
}
*rfm12->out_cur_end++ = snd_hdr;
*rfm12->out_cur_end++ = (u8)0;
rfm12_apply_crc16(rfm12, rfm12->out_cur_end-2, 2);
rfm12->out_cur_end += 2; // crc16 = 2 bytes
}
}
rfm12->in_cur_end = rfm12->in_buf_pos;
wake_up_interruptible(&rfm12->wait_read);
} else {
if (0 == skip_packet && 0 != rfm12->crc16)
rfm12->num_recv_crc16_fail++;
rfm12->in_buf_pos = rfm12->in_cur_end;
}
err = rfm12_finish_send_recv_common(rfm12);
}
return err;
}
static int
rfm12_finish_sending(struct rfm12_data* rfm12, int success)
{
int err = 0, len = 0;
rfm12_update_rxtx_watchdog(rfm12, 1);
if (success) {
len = rfm12->out_buf[1] + RF_EXTRA_LEN;
memmove(rfm12->out_buf,
rfm12->out_buf + len,
DATA_BUF_SIZE - len
);
rfm12->out_cur_end -= len;
rfm12->out_buf_pos = rfm12->out_buf;
if (rfm12->out_cur_end == rfm12->out_buf) {
// If buffer is empty set TX to low
msleep(10);
pin_low(TX_P, TX_PIN);
pin_high(RX_P, RX_PIN);
msleep(10);
}
rfm12->pkts_sent++;
rfm12->bytes_sent += len - RF_EXTRA_LEN;
wake_up_interruptible(&rfm12->wait_write);
}
err = rfm12_finish_send_recv_common(rfm12);
return err;
}
static void
rfm12_recv_spi_completion_handler(void *arg)
{
u8* recv_data;
unsigned long flags;
uint16_t status, packet_finished = 0, valid_interrupt = 0;
struct rfm12_spi_message* spi_msg =
(struct rfm12_spi_message*)arg;
struct rfm12_data* rfm12 =
(struct rfm12_data*)spi_msg->context;
spin_lock_irqsave(&rfm12->lock, flags);
rfm12_spi_completion_common(spi_msg);
recv_data = spi_msg->spi_rx;
status = (recv_data[0] << 8) | recv_data[1];
rfm12->last_status = status;
valid_interrupt =
((status & RF_STATUS_BIT_FFIT_RGIT) && !(status & RF_STATUS_BIT_FFEM)) ||
(status & RF_STATUS_BIT_FFOV_RGUR);
if (valid_interrupt && RFM12_STATE_LISTEN == rfm12->state)
rfm12->state = RFM12_STATE_RECV;
if (valid_interrupt) {
if (NULL != rfm12->in_buf) {
if (rfm12->in_buf_pos < (rfm12->in_buf + DATA_BUF_SIZE)) {
*rfm12->in_buf_pos++ = recv_data[3];
if (0 == rfm12->in_cur_num_bytes)
rfm12->crc16 = rfm12_crc16_update(~0, rfm12->group_id);
rfm12->crc16 = rfm12_crc16_update(rfm12->crc16, recv_data[3]);
}
if (1 == rfm12->in_cur_num_bytes) {
rfm12->in_cur_len_pos = rfm12->in_buf_pos-1;
if (*rfm12->in_cur_len_pos > RF_MAX_DATA_LEN)
// if the data len is larger than RF_MAX_DATA_LEN, we
// ignore this packet early.
*rfm12->in_cur_len_pos = 0;
}
if (1 < rfm12->in_cur_num_bytes) {
// +2 ... those are the CRC bytes, +2 for header & length
if (rfm12->in_cur_num_bytes+1 >= (*rfm12->in_cur_len_pos + RF_EXTRA_LEN) ||
rfm12->in_cur_num_bytes+1 >= (RF_MAX_LEN)) {
(void)rfm12_finish_receiving(rfm12, 0);
packet_finished = 1;
}
}
if (!packet_finished) {
rfm12->in_cur_num_bytes++;
rfm12_update_rxtx_watchdog(rfm12, 0);
}
} else {
(void)rfm12_finish_receiving(rfm12, 1);
packet_finished = 1;
}
if ((status & RF_STATUS_BIT_FFOV_RGUR) && !packet_finished) {
rfm12->num_recv_overflows++;
if (RFM12B_DROP_PACKET_ON_FFOV)
(void)rfm12_finish_receiving(rfm12, 1);
}
}
spin_unlock_irqrestore(&rfm12->lock, flags);
if (!rfm12->should_release &&
(!valid_interrupt ||
(!packet_finished && (RFM12B_DROP_PACKET_ON_FFOV &&
!(status & RF_STATUS_BIT_FFOV_RGUR)))))
platform_irq_handled(rfm12->irq_identifier);
}
static void
rfm12_send_spi_completion_handler(void *arg)
{
unsigned long flags;
uint16_t status, valid_interrupt = 0, packet_finished = 0;
struct rfm12_spi_message* spi_msg =
(struct rfm12_spi_message*)arg;
struct rfm12_data* rfm12 =
(struct rfm12_data*)spi_msg->context;
spin_lock_irqsave(&rfm12->lock, flags);
rfm12_spi_completion_common(spi_msg);
status = (spi_msg->spi_rx[0] << 8) | spi_msg->spi_rx[1];
rfm12->last_status = status;
valid_interrupt =
((status & RF_STATUS_BIT_FFIT_RGIT) || (status & RF_STATUS_BIT_FFOV_RGUR));
if (valid_interrupt && NULL != rfm12->out_buf) {
if (RFM12B_RETRY_SEND_ON_RGUR && (status & RF_STATUS_BIT_FFOV_RGUR)) {
packet_finished = 1;
rfm12->num_send_underruns++;
(void)rfm12_finish_sending(rfm12, 0);
} else {
if (!RFM12B_RETRY_SEND_ON_RGUR && (status & RF_STATUS_BIT_FFOV_RGUR))
rfm12->num_send_underruns++;
switch(rfm12->state) {
case RFM12_STATE_SEND_PRE1:
rfm12->out_buf_pos = rfm12->out_buf;
rfm12->out_cur_num_bytes = rfm12->out_buf_pos[1] + RF_EXTRA_LEN;
case RFM12_STATE_SEND_PRE2:
case RFM12_STATE_SEND_PRE3:
case RFM12_STATE_SEND_SYN1:
case RFM12_STATE_SEND_SYN2:
case RFM12_STATE_SEND_TAIL1:
case RFM12_STATE_SEND_TAIL2:
rfm12->state++;
break;
case RFM12_STATE_SEND:
rfm12->out_cur_num_bytes--;
if (0 == rfm12->out_cur_num_bytes) {
rfm12->state = RFM12_STATE_SEND_TAIL1;
}
break;
case RFM12_STATE_SEND_TAIL3:
packet_finished = 1;
(void)rfm12_finish_sending(rfm12, 1);
break;
default:
// should never happen
packet_finished = 1;
(void)rfm12_finish_sending(rfm12, 0);
break;
}
if (!packet_finished)
rfm12_update_rxtx_watchdog(rfm12, 0);
}
}
spin_unlock_irqrestore(&rfm12->lock, flags);
if (!rfm12->should_release && (!valid_interrupt || !packet_finished))
platform_irq_handled(rfm12->irq_identifier);
}
static int
rfm12_request_fifo_byte(struct rfm12_data* rfm12)
{
uint16_t cmds[2];
cmds[0] = RF_READ_STATUS;
cmds[1] = RF_RX_FIFO_READ;
return rfm12_send_generic_async_cmd(rfm12, cmds, 2,
READ_FIFO_WAIT, rfm12_recv_spi_completion_handler,
RFM12_STATE_NO_CHANGE);
}
static int
rfm12_write_tx_byte(struct rfm12_data* rfm12, u8 tx_byte)
{
uint16_t cmds[2];
cmds[0] = RF_READ_STATUS;
cmds[1] = RF_TXREG_WRITE | tx_byte;
return rfm12_send_generic_async_cmd(rfm12, cmds, 2,
WRITE_TX_WAIT, rfm12_send_spi_completion_handler,
RFM12_STATE_NO_CHANGE);
}
static void
rfm12_trysend_retry_timer_expired(unsigned long ptr)
{
unsigned long flags;
struct rfm12_data* rfm12 = (struct rfm12_data*)ptr;
spin_lock_irqsave(&rfm12->lock, flags);
if (rfm12->retry_sending_running)
rfm12_try_sending(rfm12);
rfm12->retry_sending_running = 0;
spin_unlock_irqrestore(&rfm12->lock, flags);
}
static void
rfm12_trysend_completion_handler(void *arg)
{
unsigned long flags;
uint16_t status = 0;
struct rfm12_spi_message* spi_msg =
(struct rfm12_spi_message*)arg;
struct rfm12_data* rfm12 =
(struct rfm12_data*)spi_msg->context;
spin_lock_irqsave(&rfm12->lock, flags);
rfm12->retry_sending_running = 0;
rfm12_spi_completion_common(spi_msg);
status = (spi_msg->spi_rx[0] << 8) | spi_msg->spi_rx[1];
rfm12->last_status = status;
if ((RFM12_STATE_IDLE == rfm12->state || RFM12_STATE_LISTEN == rfm12->state) &&
0 == (status & RF_STATUS_BIT_RSSI)) {
uint16_t cmd[64];
uint8_t numCmds = 0;
cmd[numCmds++] = RF_IDLE_MODE;
cmd[numCmds++] = RF_READ_STATUS;
cmd[numCmds++] = RF_RX_FIFO_READ;
cmd[numCmds++] = RF_XMITTER_ON;
rfm12->state = RFM12_STATE_SEND_PRE1;
rfm12_update_rxtx_watchdog(rfm12, 0);
rfm12_send_generic_async_cmd(rfm12, cmd, numCmds,
0, NULL, RFM12_STATE_NO_CHANGE);
} else if (RFM12_STATE_SEND_PRE1 > rfm12->state) {
// try again a bit later...
init_timer(&rfm12->retry_sending_timer);
rfm12->retry_sending_timer.expires = jiffies + TRYSEND_RETRY_JIFFIES;
rfm12->retry_sending_timer.data = (unsigned long)rfm12;
rfm12->retry_sending_timer.function = rfm12_trysend_retry_timer_expired;
add_timer(&rfm12->retry_sending_timer);
rfm12->retry_sending_running = 1;
}
rfm12->trysend = 0;
spin_unlock_irqrestore(&rfm12->lock, flags);
}
// 0 ... nothing to send, can go to listen state
// 1 ... something needs sending, don't go to listen state
static int
rfm12_try_sending(struct rfm12_data* rfm12)
{
int retval = 0;
if (!rfm12->trysend && NULL != rfm12->out_buf && rfm12->out_cur_end != rfm12->out_buf) {
uint16_t cmd = RF_READ_STATUS;
(void)rfm12_send_generic_async_cmd(rfm12, &cmd, 1,
0, rfm12_trysend_completion_handler, RFM12_STATE_NO_CHANGE);
retval = rfm12->trysend = 1;
}
return retval;
}