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spi-buspirate.c
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spi-buspirate.c
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/*
* A Linux kernel module for Bus Pirate / BusPirate as a SPI bus adapter
*
* Author: niicoooo <[email protected]>
* Copyright (C) 2017 by niicoooo <[email protected]>
*
* This program 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.
*
* This program 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 keysniffer. If not, see <http://www.gnu.org/licenses/>.
*/
#define pr_fmt(fmt) "spi-bp: " fmt
#define DEBUG 1
#include <linux/mutex.h>
#include <linux/ctype.h>
#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/kernel.h>
#include <linux/kthread.h>
#include <linux/module.h>
#include <linux/semaphore.h>
#include <linux/spi/spi.h>
#include <linux/spinlock.h>
#include <linux/timer.h>
#include <linux/tty.h>
#include <linux/wait.h>
#include <linux/workqueue.h>
#include <linux/kobject.h>
#include <linux/list.h>
#include <linux/version.h>
#include <generated/utsrelease.h>
#define ENABLESPI 1
#define ENABLESPIDEV 1
#define ENABLEGPIO 1
// #define ENABLEDEBUGIO 1
#define RXTIMEOUTMS 100
#define RXBUFFERSIZE 1024
#define BOOTMSGSIZE 200
#define BPSPI_STATE_STARTING 0
#define BPSPI_STATE_OK 1
#define BPSPI_STATE_ERROR 2
#define BPSPI_STATE_STOP 3
static int gpio_base = -1;
static int spi_base = -1;
struct bp {
struct list_head list;
int id;
char name[10];
struct kobject kobj;
atomic_t status;
wait_queue_head_t status_queue;
struct mutex busy;
unsigned long BPconfig;
unsigned long SPIconfig;
unsigned long SPISpeedconfig;
char bootmsg[BOOTMSGSIZE];
char rx_buffer[RXBUFFERSIZE];
atomic_t rx_len;
struct semaphore rx_semaphore;
wait_queue_head_t rx_queue;
struct timer_list rx_timer;
atomic_t rx_timeout;
struct tty_struct *tty;
struct task_struct *task;
#ifdef ENABLEGPIO
struct gpio_chip gpio_chip;
#endif
#ifdef ENABLESPI
struct spi_master *spi_master;
char spi_name[32];
#ifdef ENABLESPIDEV
struct spi_device *spi_device;
#endif
#endif
};
struct kobject module_kobj;
static DEFINE_MUTEX(list_lock); /* Must be locked to r/w list */
static LIST_HEAD(list);
static const int gpio_pin_offset[] = { // 3.6 0100wxyz - Configure peripherals w=power, x=pull-ups, y=AUX, z=CS
0, 1, 3
};
/* ------ RX Timeout ------ */
static void rx_timout_reset(struct bp *bp) {
atomic_set(&bp->rx_timeout, 0);
wake_up(&bp->rx_queue);
mod_timer(&bp->rx_timer, jiffies + msecs_to_jiffies(RXTIMEOUTMS));
}
static void rx_timeout_callback(unsigned long data) {
struct bp *bp = (struct bp*)data;
atomic_set(&bp->rx_timeout, 1);
wake_up(&bp->rx_queue);
}
/* ------ TX & RX ------ */
static int bp_io_tx(struct bp *bp, char *tx_buf, int tx_len) /* Send data over serial line */
{
int rc, i;
BUG_ON(!mutex_is_locked(&bp->busy));
if (atomic_read(&bp->status) > BPSPI_STATE_OK) {
pr_debug("(%s) TX cancelled!\n", bp->tty->name);
return -1;
}
#ifdef ENABLEDEBUGIO
char s[50];
snprintf(s, 50, "BPSpi: (%s) -> ", bp->tty->name);
print_hex_dump(KERN_DEBUG, s, DUMP_PREFIX_NONE, 16, 8, tx_buf, tx_len, true);
#endif
i = 0;
while (i < tx_len) {
rc = bp->tty->ops->write(bp->tty, &tx_buf[i], tx_len - i);
if (rc < 0) {
pr_debug("(%s) tty->ops->write error: %i", bp->tty->name, rc);
return -1;
}
i += rc;
tty_wait_until_sent(bp->tty, 0);
}
return 0;
}
static int bp_io_tx_char(struct bp *bp, char c) /* Send data over serial line */
{
char buffer[1];
BUG_ON(!mutex_is_locked(&bp->busy));
buffer[0] = c;
return bp_io_tx(bp, buffer, 1);
}
static int bp_io_rx(struct bp *bp, int rx_expected) /* Wait for data from serial line */
{
BUG_ON(!mutex_is_locked(&bp->busy));
if (atomic_read(&bp->status) > BPSPI_STATE_OK) {
pr_debug("(%s) RX cancelled!\n", bp->tty->name);
return 0;
}
rx_timout_reset(bp);
wait_event(bp->rx_queue, (atomic_read(&bp->rx_len) >= rx_expected) || (atomic_read(&bp->rx_timeout) != 0));
return atomic_read(&bp->rx_len);
}
static void bp_io_rx_flush(struct bp *bp) /* Flush RX buffer */
{
BUG_ON(!mutex_is_locked(&bp->busy));
down(&bp->rx_semaphore);
atomic_set(&bp->rx_len, 0);
up(&bp->rx_semaphore);
}
static void bp_io_rx_get(struct bp *bp, char *buffer, int len) /* Get RX data from buffer */
{
BUG_ON(!mutex_is_locked(&bp->busy));
BUG_ON(len > atomic_read(&bp->rx_len));
down(&bp->rx_semaphore);
memmove(buffer, &bp->rx_buffer, len);
atomic_sub(len, &bp->rx_len);
memmove(&bp->rx_buffer, &(bp->rx_buffer[atomic_read(&bp->rx_len)]), len);
up(&bp->rx_semaphore);
}
#define MSLEEP_INTERRUPTIBLE(A) if (msleep_interruptible(A)) { err = __LINE__; goto fail; }
#define BP_TX(BP, A, B) if (bp_io_tx(BP, A, B) < 0) { err = __LINE__; goto fail; }
#define BP_TX_CHAR(BP, A) if (bp_io_tx_char(BP, A) < 0) { err = __LINE__; goto fail; }
#define BP_RX(BP, A) if (bp_io_rx(BP, A) != A) { err = __LINE__; goto fail; }
#define BP_RX_GET_AND_MEMCMP(BP, A, B) { \
char buffer[B + 1]; \
bp_io_rx_get(BP, buffer, B); \
if (memcmp(buffer, A, B)) { err = __LINE__; goto fail; } \
}
/* ------ SPI callbacks ------ */
#ifdef ENABLESPI
int bp_spi_transfer_one(struct spi_master *master, struct spi_device *spi, struct spi_transfer *transfer)
{
struct bp *bp;
int err, i;
char buffer[10];
const char *tx_buf;
char *rx_buf;
char s[50];
bp = (struct bp *)spi_master_get_devdata(master);
tx_buf = transfer->tx_buf;
rx_buf = transfer->rx_buf;
pr_debug("(%s) spi_transfer_one (len:%d tx_nbits:%d rx_nbits:%d)", bp->tty->name, transfer->len, transfer->tx_nbits, transfer->rx_nbits);
snprintf(s, 50, "BPSpi: (%s) spi_transfer_one: -> ", bp->tty->name);
print_hex_dump(KERN_DEBUG, s, DUMP_PREFIX_NONE, 16, 8, tx_buf, transfer->len, true);
mutex_lock(&bp->busy);
if (atomic_read(&bp->status) > BPSPI_STATE_OK) {
mutex_unlock(&bp->busy);
pr_debug("(%s) SPI cancelled!\n", bp->tty->name);
return -1;
}
for (i = 0; i < transfer->len; i++) {
BP_TX_CHAR(bp, 0x10);
BP_RX(bp, 1);
BP_RX_GET_AND_MEMCMP(bp, "\x01", 1);
BP_TX_CHAR(bp, tx_buf[i]);
BP_RX(bp, 1);
bp_io_rx_get(bp, buffer, 1);
rx_buf[i] = buffer[0];
}
mutex_unlock(&bp->busy);
snprintf(s, 50, "BPSpi: (%s) spi_transfer_one: <- ", bp->tty->name);
print_hex_dump(KERN_DEBUG, s, DUMP_PREFIX_NONE, 16, 8, rx_buf, transfer->len, true);
return 0;
fail:
pr_err("(%s) spi_transfer_one aborted (%s:%d)!\n", bp->tty->name, __FUNCTION__, err);
if (atomic_read(&bp->status) != BPSPI_STATE_STOP) {
atomic_set(&bp->status, BPSPI_STATE_ERROR);
}
mutex_unlock(&bp->busy);
wake_up(&bp->status_queue);
return -1;
}
static int bp_spi_setup(struct spi_device *spi)
{
struct bp *bp;
int err;
bp = spi_master_get_devdata(spi->master);
mutex_lock(&bp->busy);
if (atomic_read(&bp->status) > BPSPI_STATE_OK) {
pr_debug("(%s) bp_spi_setup aborted\n", bp->tty->name);
mutex_unlock(&bp->busy);
return -1;
}
if (spi->mode & SPI_CPHA) {
set_bit(2, &bp->SPIconfig);
} else {
clear_bit(2, &bp->SPIconfig);
}
if (spi->mode & SPI_CPOL) {
set_bit(1, &bp->SPIconfig);
} else {
clear_bit(1, &bp->SPIconfig);
}
pr_debug("(%s) bp_spi_setup(val:%x SPIconfig reg:%lx)\n", bp->tty->name, spi->mode, bp->SPIconfig);
BP_TX_CHAR(bp, (0x80 | (0x0F & bp->SPIconfig)));
BP_RX(bp, 1);
BP_RX_GET_AND_MEMCMP(bp, "\x01", 1);
mutex_unlock(&bp->busy);
pr_debug("(%s) bp_spi_setup done\n", bp->tty->name);
return 0;
fail:
pr_err("(%s) bp_spi_setup aborted (%s:%d)!\n", bp->tty->name, __FUNCTION__, err);
if (atomic_read(&bp->status) != BPSPI_STATE_STOP) {
atomic_set(&bp->status, BPSPI_STATE_ERROR);
}
mutex_unlock(&bp->busy);
wake_up(&bp->status_queue);
return -1;
}
#endif
/* ------ GPIO callbacks ------ */
#ifdef ENABLEGPIO
static int bp_gpio_get_value(struct gpio_chip *gc, unsigned offset)
{
struct bp *bp;
int r = 0;
BUG_ON(offset >= 3);
bp = container_of(gc, struct bp, gpio_chip);
mutex_lock(&bp->busy);
if(test_bit(gpio_pin_offset[offset], &bp->BPconfig)) {
r = 1;
}
mutex_unlock(&bp->busy);
pr_debug("(%s) gpio_get_value (offset:%d val:%d)\n", bp->tty->name, offset, r);
return r;
}
static void bp_gpio_set_value(struct gpio_chip *gc, unsigned offset, int val)
{
struct bp *bp;
int err;
BUG_ON(offset >= 3);
bp = container_of(gc, struct bp, gpio_chip);
mutex_lock(&bp->busy);
if (atomic_read(&bp->status) > BPSPI_STATE_OK) {
pr_debug("(%s) gpio_set_value aborted\n", bp->tty->name);
mutex_unlock(&bp->busy);
return;
}
if (val) {
set_bit(gpio_pin_offset[offset], &bp->BPconfig);
} else {
clear_bit(gpio_pin_offset[offset], &bp->BPconfig);
}
pr_debug("(%s) gpio_set_value (offset:%d val:%d BPconfig reg:%lx)\n", bp->tty->name, offset, val, bp->BPconfig);
BP_TX_CHAR(bp, (0x40 | (0x0F & bp->BPconfig)));
BP_RX(bp, 1);
BP_RX_GET_AND_MEMCMP(bp, "\x01", 1);
mutex_unlock(&bp->busy);
pr_debug("(%s) gpio_set_value done\n", bp->tty->name);
return;
fail:
pr_err("(%s) gpio_set_value aborted (%s:%d)!\n", bp->tty->name, __FUNCTION__, err);
if (atomic_read(&bp->status) != BPSPI_STATE_STOP) {
atomic_set(&bp->status, BPSPI_STATE_ERROR);
}
mutex_unlock(&bp->busy);
wake_up(&bp->status_queue);
return;
}
static int bp_gpio_get_direction(struct gpio_chip *gc, unsigned offset)
{
struct bp *bp;
BUG_ON(offset >= 3);
bp = container_of(gc, struct bp, gpio_chip);
pr_debug("(%s) gpio_get_direction (offset:%d)\n", bp->tty->name, offset);
return 0;
}
static int bp_gpio_direction_output(struct gpio_chip *gc, unsigned offset, int val)
{
struct bp *bp;
BUG_ON(offset >= 3);
bp = container_of(gc, struct bp, gpio_chip);
pr_debug("(%s) gpio_direction_output (offset:%d val:%d)\n", bp->tty->name, offset, val);
return 0;
}
static int bp_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
{
struct bp *bp;
BUG_ON(offset >= 3);
bp = container_of(gc, struct bp, gpio_chip);
pr_debug("(%s) gpio_direction_input (offset:%d)\n", bp->tty->name, offset);
return -EPERM;
}
#endif
/* ------ Sysfs ------ */
static void static_kobj_release(struct kobject *kobj)
{
pr_info("(%s) kobj realeased\n", kobj->name);
}
static struct kobj_type static_kobj_ktype = {
.release = static_kobj_release,
.sysfs_ops = &kobj_sysfs_ops,
};
static const int bp_status_id[] = {
BPSPI_STATE_STARTING,
BPSPI_STATE_OK,
BPSPI_STATE_ERROR,
BPSPI_STATE_STOP,
};
static const char* bp_status_name[] = {
"starting",
"ok",
"error",
"stopping",
"???",
};
static ssize_t status_show(struct kobject * kobj, struct kobj_attribute * attr, char * buf)
{
int i;
struct bp *bp = container_of(kobj , struct bp, kobj);
int s = atomic_read(&bp->status);
for (i = 0; i < (sizeof(bp_status_id) / sizeof(int)); i++) {
if (bp_status_id[i] == s) {
break;
}
}
return scnprintf(buf, PAGE_SIZE, "%s", bp_status_name[i]);
}
static struct kobj_attribute status_attribute = __ATTR_RO(status);
static const struct attribute *attrs1[] =
{
&status_attribute.attr,
NULL,
};
static ssize_t bootmsg_show(struct kobject * kobj, struct kobj_attribute * attr, char * buf)
{
struct bp *bp = container_of(kobj , struct bp, kobj);
return scnprintf(buf, PAGE_SIZE, "%s", bp->bootmsg);
}
static struct kobj_attribute bootmsg_attribute = __ATTR_RO(bootmsg);
#ifdef ENABLEGPIO
#define SYSFS_SHOW(NAME, OFFSET) \
static ssize_t NAME##_show(struct kobject * kobj, struct kobj_attribute * attr, char * buf) \
{ \
struct bp *bp = container_of(kobj , struct bp, kobj); \
return scnprintf(buf, PAGE_SIZE, "%i", bp->gpio_chip.base + OFFSET); \
}
SYSFS_SHOW(cs, 0);
SYSFS_SHOW(aux, 1);
SYSFS_SHOW(pwr, 2);
static struct kobj_attribute cs_attribute = __ATTR_RO(cs);
static struct kobj_attribute aux_attribute = __ATTR_RO(aux);
static struct kobj_attribute pwr_attribute = __ATTR_RO(pwr);
#endif
#ifdef ENABLESPI
static ssize_t spi_show(struct kobject * kobj, struct kobj_attribute * attr, char * buf)
{
struct bp *bp = container_of(kobj , struct bp, kobj);
return scnprintf(buf, PAGE_SIZE, "%i", bp->spi_master->bus_num);
}
static struct kobj_attribute spi_attribute = __ATTR_RO(spi);
static const int bp_speed[] = {
30000,
125000,
250000,
1000000,
2000000,
2600000,
4000000,
8000000,
};
static ssize_t speed_show(struct kobject * kobj, struct kobj_attribute * attr, char * buf)
{
struct bp *bp = container_of(kobj , struct bp, kobj);
BUG_ON(bp->SPISpeedconfig >= 0x08);
return scnprintf(buf, PAGE_SIZE, "%i", bp_speed[bp->SPISpeedconfig]);
}
static ssize_t speed_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t len)
{
int s;
int i;
int err;
struct bp *bp = container_of(kobj , struct bp, kobj);
if(kstrtoint(buf, 10, &s)) {
return -EINVAL;
}
for (i = 0; i < (sizeof(bp_speed) / sizeof(int)); i++) {
if (bp_speed[i] == s) {
break;
}
}
if (i == sizeof(bp_speed) / sizeof(int)) {
pr_debug("(%s) speed_store invalid value(%s)\n", bp->tty->name, buf);
return -EINVAL;
}
bp->SPISpeedconfig = i;
mutex_lock(&bp->busy);
if (atomic_read(&bp->status) > BPSPI_STATE_OK) {
pr_debug("(%s) speed_store aborted\n", bp->tty->name);
mutex_unlock(&bp->busy);
return -1;
}
pr_debug("(%s) speed_store(SPISpeedconfig reg:%lx speed: %i)\n", bp->tty->name, bp->SPISpeedconfig, s);
BP_TX_CHAR(bp, (0x60 | (0x0F & bp->SPISpeedconfig)));
BP_RX(bp, 1);
BP_RX_GET_AND_MEMCMP(bp, "\x01", 1);
mutex_unlock(&bp->busy);
pr_debug("(%s) speed_store done\n", bp->tty->name);
return len;
fail:
pr_err("(%s) speed_store aborted (%s:%d)!\n", bp->tty->name, __FUNCTION__, err);
if (atomic_read(&bp->status) != BPSPI_STATE_STOP) {
atomic_set(&bp->status, BPSPI_STATE_ERROR);
}
mutex_unlock(&bp->busy);
wake_up(&bp->status_queue);
return -1;
}
static struct kobj_attribute speed_attribute = __ATTR_RW(speed);
#endif
static const struct attribute *attrs2[] =
{
&bootmsg_attribute.attr,
#ifdef ENABLEGPIO
&cs_attribute.attr,
&aux_attribute.attr,
&pwr_attribute.attr,
#endif
#ifdef ENABLESPI
&spi_attribute.attr,
&speed_attribute.attr,
#endif
NULL,
};
/* ------ Task mngt, BP Init, Dev init & remove ------ */
static void __bp_dev_remove(struct bp *bp) /* Remove spi_master, spi_device, gpio_chip */
{
sysfs_remove_files(&bp->kobj, attrs2);
#ifdef ENABLESPI
#ifdef ENABLESPIDEV
spi_unregister_device(bp->spi_device);
#endif
sysfs_remove_link(&bp->kobj, bp->spi_name);
spi_unregister_master(bp->spi_master);
#endif
#ifdef ENABLEGPIO
#if LINUX_VERSION_CODE <= KERNEL_VERSION(3,17,8)
WARN_ON(gpiochip_remove(&bp->gpio_chip));
#else
gpiochip_remove(&bp->gpio_chip);
#endif
#endif
};
static int __bp_dev_add(struct bp *bp) /* Create spi_master, spi_device, gpio_chip */
{
int rc;
if (atomic_read(&bp->status) > BPSPI_STATE_OK) {
return -1;
}
/* ------ gpio_chip create ------ */
#ifdef ENABLEGPIO
bp->gpio_chip.label = "BPSpi GPIO";
bp->gpio_chip.owner = THIS_MODULE;
bp->gpio_chip.get_direction = bp_gpio_get_direction;
bp->gpio_chip.direction_input = bp_gpio_direction_input;
bp->gpio_chip.direction_output = bp_gpio_direction_output;
bp->gpio_chip.get = bp_gpio_get_value;
bp->gpio_chip.set = bp_gpio_set_value;
bp->gpio_chip.can_sleep = true;
bp->gpio_chip.ngpio = 3;
bp->gpio_chip.base = gpio_base;
if ((rc = gpiochip_add(&bp->gpio_chip))) {
pr_err("(%s) gpiochip_add failed (rc = %d)\n", bp->tty->name, rc);
return -1;
}
#endif
/* ------ spi_master create ------ */
#ifdef ENABLESPI
bp->spi_master = spi_alloc_master(bp->tty->dev, 0);
if (!bp->spi_master) {
pr_err("(%s) spi_alloc_master failed\n", bp->tty->name);
goto remove_gpio;
}
spi_master_set_devdata(bp->spi_master, bp);
bp->spi_master->bus_num = spi_base;
bp->spi_master->bits_per_word_mask = SPI_BIT_MASK(8);
bp->spi_master->mode_bits = SPI_CPHA | SPI_CPOL;
bp->spi_master->transfer_one = bp_spi_transfer_one;
bp->spi_master->setup = bp_spi_setup;
bp->spi_master->min_speed_hz = 30000;
bp->spi_master->max_speed_hz = 8000000;
if ((rc = spi_register_master(bp->spi_master))) {
pr_err("(%s) spi_register_master failed (rc = %d)\n", bp->tty->name, rc);
spi_master_put(bp->spi_master);
goto remove_gpio;
}
scnprintf(bp->spi_name, 32, "%s", dev_name(&bp->spi_master->dev));
if((rc = sysfs_create_link(&bp->kobj, &bp->spi_master->dev.kobj, bp->spi_name))) {
pr_err("(%s) sysfs_create_link failed (rc = %d)\n", bp->tty->name, rc);
spi_unregister_master(bp->spi_master);
goto remove_gpio;
}
/* ------ spi_device create ------ */
#ifdef ENABLESPIDEV
bp->spi_device = spi_alloc_device(bp->spi_master);
if (!bp->spi_device) {
pr_err("(%s) spi_alloc_device failed\n", bp->tty->name);
goto remove_spi;
}
snprintf(bp->spi_device->modalias, SPI_NAME_SIZE, "spidev");
if ((rc = spi_add_device(bp->spi_device))) {
pr_err("(%s) spi_add_device failed (rc = %d)\n", bp->tty->name, rc);
spi_dev_put(bp->spi_device);
goto remove_spi;
}
#endif
#endif
/* ------ Sysfs setup ------ */
if ((rc = sysfs_create_files(&bp->kobj, attrs2))) {
pr_err("(%s) sysfs_create_files 2 failed (rc = %d)\n", bp->tty->name, rc);
goto remove_spidev;
}
/* ------ Display result ------ */
#ifdef ENABLESPI
#ifdef ENABLESPIDEV
pr_info("(%s) spi_device added: %s\n", bp->tty->name, dev_name(&bp->spi_device->dev));
#endif
pr_info("(%s) spi_master added: spi%u\n", bp->tty->name, bp->spi_master->bus_num);
#endif
#ifdef ENABLEGPIO
pr_info("(%s) gpiochip added: pins %d to %d\n", bp->tty->name, bp->gpio_chip.base, bp->gpio_chip.base + 2);
#endif
return 0;
/* ------ error mngt ------ */
remove_spidev:
#ifdef ENABLESPIDEV
spi_unregister_device(bp->spi_device);
#endif
remove_spi:
#ifdef ENABLESPI
sysfs_remove_link(&bp->kobj, bp->spi_name);
spi_unregister_master(bp->spi_master);
#endif
remove_gpio:
#ifdef ENABLEGPIO
#if LINUX_VERSION_CODE <= KERNEL_VERSION(3,17,8)
WARN_ON(gpiochip_remove(&bp->gpio_chip));
#else
gpiochip_remove(&bp->gpio_chip);
#endif
#endif
return -1;
}
static int __bp_reset(struct bp *bp) /* Reset Bus Pirate and set spi mode */
{
int i, l, err;
char buffer[BOOTMSGSIZE];
BUG_ON(BOOTMSGSIZE <= 10);
bp_io_rx_flush(bp);
for (i = 0; i < 20; i++) { /* Send 0x00 20 times */
BP_TX(bp, "\x00", 1);
MSLEEP_INTERRUPTIBLE(10);
bp_io_rx_flush(bp);
}
MSLEEP_INTERRUPTIBLE(10);
BP_TX(bp, "\x0F", 1); /* Send 0x0F to reset */
MSLEEP_INTERRUPTIBLE(500);
bp_io_rx_flush(bp);
for (i = 0; i < 10; i++) { /* Send <Enter> 10 times */
BP_TX(bp, "\n", 1);
MSLEEP_INTERRUPTIBLE(10);
bp_io_rx_flush(bp);
}
BP_TX(bp, "#\n", 2); /* Send # to reset */
MSLEEP_INTERRUPTIBLE(500);
l = bp_io_rx(bp, RXBUFFERSIZE - 1);
pr_debug("(%s) bootmsg len: %d\n", bp->tty->name, l);
if (l > BOOTMSGSIZE - 1) {
l = BOOTMSGSIZE - 1;
}
bp_io_rx_get(bp, buffer, l);
buffer[l] = 0;
strcpy(bp->bootmsg, buffer);
bp_io_rx_flush(bp);
for (i = 0; i < 25; i++) { /* Send 0x00 25 times */
BP_TX(bp, "\x00", 1);
if (bp_io_rx(bp, 5) >= 5) {
bp_io_rx_get(bp, buffer, 5);
if (!memcmp(buffer, "BBIO1", 5))
break;
}
bp_io_rx_flush(bp);
}
if (i == 25) {
err = __LINE__;
goto fail;
}
MSLEEP_INTERRUPTIBLE(10);
bp_io_rx_flush(bp);
BP_TX(bp, "\x01", 1); /* Send 0x01 in bitbang mode to enter raw SPI mode */
BP_RX(bp, 4);
BP_RX_GET_AND_MEMCMP(bp, "SPI1", 4);
BP_TX_CHAR(bp, (0x40 | (0x0F & bp->BPconfig)));
BP_RX(bp, 1);
BP_RX_GET_AND_MEMCMP(bp, "\x01", 1);
BP_TX_CHAR(bp, (0x80 | (0x0F & bp->SPIconfig)));
BP_RX(bp, 1);
BP_RX_GET_AND_MEMCMP(bp, "\x01", 1);
MSLEEP_INTERRUPTIBLE(10);
bp_io_rx_flush(bp);
return 0;
fail:
pr_err("(%s) BP reset & initialization failed (%d)\n", bp->tty->name, err);
return -1;
}
static int thread_function(void *data) /* Management thread */
{
struct bp *bp = (struct bp*)data;
atomic_set(&bp->status, BPSPI_STATE_STARTING);
pr_debug("(%s) mngt task: started!\n", bp->tty->name);
mutex_lock(&bp->busy);
if (__bp_reset(bp) < 0) {
mutex_unlock(&bp->busy);
goto fail;
}
mutex_unlock(&bp->busy);
if (__bp_dev_add(bp) < 0) {
goto fail;
}
pr_debug("(%s) mngt task: initialization done!\n", bp->tty->name);
atomic_set(&bp->status, BPSPI_STATE_OK);
while(wait_event_interruptible(bp->status_queue, ((atomic_read(&bp->status) != BPSPI_STATE_OK) | kthread_should_stop())) != 0) { }
__bp_dev_remove(bp);
pr_debug("(%s) mngt task: stopped!\n", bp->tty->name);
do_exit(0);
return 0;
fail:
pr_debug("(%s) mngt task: aborted\n", bp->tty->name);
atomic_set(&bp->status, BPSPI_STATE_ERROR);
wake_up(&bp->status_queue);
do_exit(-1);
return -1;
}
/* ------ LDISC part ------ */
static void bp_ldisc_receive(struct tty_struct *tty, const unsigned char *rx_buf, char *fp, int count) /* Receive data from BP */
{
struct bp *bp = tty->disc_data;
int l;
if (unlikely(!bp)) {
pr_err("(%s) ldisc_receive aborted\n", bp->tty->name);
return;
}
down(&bp->rx_semaphore);
#ifdef ENABLEDEBUGIO
char s[50];
snprintf(s, 50, "BPSpi: (%s) <- ", tty->name);
print_hex_dump(KERN_DEBUG, s, DUMP_PREFIX_NONE, 16, 8, rx_buf, count, true);
#endif
l = min(count, RXBUFFERSIZE - atomic_read(&bp->rx_len));
if (l != count) {
pr_err("(%s) ldisc_receive overflow\n", bp->tty->name);
}
memcpy(&bp->rx_buffer[atomic_read(&bp->rx_len)], rx_buf, l);
atomic_add(l, &bp->rx_len);
rx_timout_reset(bp);
up(&bp->rx_semaphore);
wake_up(&bp->rx_queue);
return;
}
static int __bp_getid(void)
{
int id = 1;
struct list_head *ptr;
struct bp *entry;
list_for_each(ptr, &list) {
entry = list_entry(ptr, struct bp, list);
if (id == entry->id) {
id++;
ptr = list.next;
}
}
return id;
}
static int bp_ldisc_open(struct tty_struct *tty)
{
struct bp *bp;
struct ktermios ktermios;
int rc;
/* ------ Struct allocation ------ */
pr_debug("(%s) ldisc_open\n", tty->name);
bp = kzalloc(sizeof(struct bp), GFP_KERNEL);
if (!bp) {
pr_err("(%s) bp_ldisc_open: kzalloc failed\n", tty->name);
return -ENOMEM;
}
tty->disc_data = bp;
bp->tty = tty;
bp->bootmsg[0] = 0;
/* ------ Sysfs setup ------ */
mutex_lock(&list_lock);
list_add((struct list_head*)bp, &list);
bp->id = __bp_getid();
mutex_unlock(&list_lock);
snprintf(bp->name, 10, "%04i", bp->id);
memset(&bp->kobj, 0, sizeof (module_kobj));
if((rc = kobject_init_and_add(&bp->kobj, &static_kobj_ktype, &module_kobj, bp->name))) {
pr_err("(%s) thread kobject_init_and_add failed (rc = %d)\n", tty->name, rc);
mutex_lock(&list_lock);
list_del((struct list_head*)bp);
mutex_unlock(&list_lock);
goto remove_struct;
}
if((rc = sysfs_create_link(&bp->kobj, &tty->dev->kobj ,tty->name))) {
pr_err("(%s) sysfs_create_link failed (rc = %d)\n", tty->name, rc);
goto remove_kobj;
}
if ((rc = sysfs_create_files(&bp->kobj, attrs1))) {
sysfs_remove_link(&bp->kobj, tty->name);
pr_err("(%s) sysfs_create_files 1 failed (rc = %d)\n", bp->tty->name, rc);
goto remove_kobj;
}
/* ------ Misc variables setup ------ */
atomic_set(&bp->status, BPSPI_STATE_STARTING);
mutex_init(&bp->busy);
init_waitqueue_head(&bp->status_queue);
bp->BPconfig = 0x00; /* Configure peripherals w=power, x=pull-ups, y=AUX, z=CS */
bp->SPIconfig = 0x02; /* SPI config, w=HiZ/3.3v, x=CKP idle, y=CKE edge, z=SMP sample */
bp->SPISpeedconfig = 0x00; /* SPI speed 000=30kHz, 001=125kHz, 010=250kHz, 011=1MHz, 100=2MHz, 101=2.6MHz, 110=4MHz, 111=8MHz */
/* ------ RX variables setup ------ */
init_waitqueue_head(&bp->rx_queue);
sema_init(&bp->rx_semaphore, 1);
atomic_set(&bp->rx_len, 0);
atomic_set(&bp->rx_timeout, 0);
setup_timer(&bp->rx_timer, rx_timeout_callback, (unsigned long)(bp));
/* ------ TTY setup ------ */
down_write(&tty->termios_rwsem);
pr_debug("(%s) termios o:%d i:%d i:%x o:%x c:%x l:%x\n", tty->name, tty_termios_baud_rate(&tty->termios), tty_termios_input_baud_rate(&tty->termios), tty->termios.c_iflag, tty->termios.c_oflag, tty->termios.c_cflag, tty->termios.c_lflag);
up_write(&tty->termios_rwsem);
ktermios = tty->termios;
ktermios.c_iflag = 0;
ktermios.c_oflag = 0;
ktermios.c_cflag = 0x800018b2; /* Magic! */
ktermios.c_lflag = 0;
tty_set_termios(tty, &ktermios);
down_write(&tty->termios_rwsem);
tty_termios_encode_baud_rate(&tty->termios, 115200, 115200);
pr_debug("(%s) termios o:%d i:%d i:%x o:%x c:%x l:%x\n", tty->name, tty_termios_baud_rate(&tty->termios), tty_termios_input_baud_rate(&tty->termios), tty->termios.c_iflag, tty->termios.c_oflag, tty->termios.c_cflag, tty->termios.c_lflag);
up_write(&tty->termios_rwsem);
tty->receive_room = 65536;
tty_driver_flush_buffer(tty);
/* ------ Thread setup ------ */
bp->task = kthread_run(&thread_function, (void*)bp, "bp");
if (!bp->task) {
pr_err("(%s) bp_ldisc_open: kthread_run failed\n", tty->name);
goto remove_misc;
}
pr_info("(%s) line discipline opened\n", tty->name);
return 0;
/* ------ error mngt ------ */
remove_misc:
mutex_destroy(&bp->busy);
sysfs_remove_link(&bp->kobj, tty->name);
sysfs_remove_files(&bp->kobj, attrs1);
remove_kobj:
mutex_lock(&list_lock);
list_del((struct list_head*)bp);
mutex_unlock(&list_lock);
kobject_del(&bp->kobj);
kobject_put(&bp->kobj);
remove_struct:
kfree(bp);
return -ENOMEM;
}
static void bp_ldisc_close(struct tty_struct *tty)
{
struct bp *bp = tty->disc_data;
if (bp) {
pr_debug("(%s) ldisc_close\n", tty->name);
sysfs_remove_files(&bp->kobj, attrs1);
atomic_set(&bp->status, BPSPI_STATE_STOP);
wake_up(&bp->status_queue);
kthread_stop(bp->task);
del_timer_sync(&bp->rx_timer);
sysfs_remove_link(&bp->kobj, bp->tty->name);
mutex_destroy(&bp->busy);
mutex_lock(&list_lock);
list_del((struct list_head*)bp);
mutex_unlock(&list_lock);
kobject_del(&bp->kobj);
kobject_put(&bp->kobj);
kfree(bp);
tty->disc_data = 0;
pr_info("(%s) line discipline closed\n", tty->name);
}
};
static int bp_ldisc_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg)
{
pr_debug("(%s) ldisc_ioctl: %x\n", tty->name, cmd);
return 0;
}
static int bp_ldisc_hangup(struct tty_struct *tty)
{
pr_debug("(%s) ldisc_hangup\n", tty->name);
bp_ldisc_close(tty);
return 0;
}
static struct tty_ldisc_ops bp_ldisc = {
.owner = THIS_MODULE,
.magic = TTY_LDISC_MAGIC,
.name = "buspirate_spi",
.open = bp_ldisc_open, /* This function is called when the line discipline is associated */