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|
/*
* CPC-USB CAN Interface Kernel Driver
*
* Copyright (C) 2004-2009 EMS Dr. Thomas Wuensche
*
* 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; version 2 of the License.
*
* 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 this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/module.h>
#include <linux/poll.h>
#include <linux/smp_lock.h>
#include <linux/completion.h>
#include <asm/uaccess.h>
#include <linux/usb.h>
#include <linux/version.h>
#ifdef CONFIG_PROC_FS
# include <linux/proc_fs.h>
#endif
#include "cpc.h"
#include "cpc_int.h"
#include "cpcusb.h"
#include "sja2m16c.h"
/* Version Information */
#define DRIVER_AUTHOR "Sebastian Haas <haas@ems-wuensche.com>"
#define DRIVER_DESC "CPC-USB Driver for Linux Kernel 2.6"
#define DRIVER_VERSION CPC_DRIVER_VERSION
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_VERSION(DRIVER_VERSION);
MODULE_LICENSE("GPL v2");
/* Define these values to match your devices */
#define USB_CPCUSB_VENDOR_ID 0x12D6
#define USB_CPCUSB_M16C_PRODUCT_ID 0x0888
#define USB_CPCUSB_LPC2119_PRODUCT_ID 0x0444
#ifndef CONFIG_PROC_FS
#error "PROCFS needed"
#endif
#define CPC_USB_PROC_DIR CPC_PROC_DIR "cpc-usb"
static struct proc_dir_entry *procDir;
static struct proc_dir_entry *procEntry;
/* Module parameters */
static int debug;
module_param(debug, int, S_IRUGO);
/* table of devices that work with this driver */
static struct usb_device_id cpcusb_table[] = {
{USB_DEVICE(USB_CPCUSB_VENDOR_ID, USB_CPCUSB_M16C_PRODUCT_ID)},
{USB_DEVICE(USB_CPCUSB_VENDOR_ID, USB_CPCUSB_LPC2119_PRODUCT_ID)},
{} /* Terminating entry */
};
MODULE_DEVICE_TABLE(usb, cpcusb_table);
/* use to prevent kernel panic if driver is unloaded
* while a programm has still open the device
*/
DECLARE_WAIT_QUEUE_HEAD(rmmodWq);
atomic_t useCount;
static CPC_USB_T *CPCUSB_Table[CPC_USB_CARD_CNT] = { 0 };
static unsigned int CPCUsbCnt;
/* prevent races between open() and disconnect() */
static DECLARE_MUTEX(disconnect_sem);
/* local function prototypes */
static ssize_t cpcusb_read(struct file *file, char *buffer, size_t count,
loff_t *ppos);
static ssize_t cpcusb_write(struct file *file, const char *buffer,
size_t count, loff_t *ppos);
static unsigned int cpcusb_poll(struct file *file, poll_table * wait);
static int cpcusb_open(struct inode *inode, struct file *file);
static int cpcusb_release(struct inode *inode, struct file *file);
static int cpcusb_probe(struct usb_interface *interface,
const struct usb_device_id *id);
static void cpcusb_disconnect(struct usb_interface *interface);
static void cpcusb_read_bulk_callback(struct urb *urb);
static void cpcusb_write_bulk_callback(struct urb *urb);
static void cpcusb_read_interrupt_callback(struct urb *urb);
static int cpcusb_setup_intrep(CPC_USB_T *card);
static struct file_operations cpcusb_fops = {
/*
* The owner field is part of the module-locking
* mechanism. The idea is that the kernel knows
* which module to increment the use-counter of
* BEFORE it calls the device's open() function.
* This also means that the kernel can decrement
* the use-counter again before calling release()
* or should the open() function fail.
*/
.owner = THIS_MODULE,
.read = cpcusb_read,
.write = cpcusb_write,
.poll = cpcusb_poll,
.open = cpcusb_open,
.release = cpcusb_release,
};
/*
* usb class driver info in order to get a minor number from the usb core,
* and to have the device registered with devfs and the driver core
*/
static struct usb_class_driver cpcusb_class = {
.name = "usb/cpc_usb%d",
.fops = &cpcusb_fops,
.minor_base = CPC_USB_BASE_MNR,
};
/* usb specific object needed to register this driver with the usb subsystem */
static struct usb_driver cpcusb_driver = {
.name = "cpc-usb",
.probe = cpcusb_probe,
.disconnect = cpcusb_disconnect,
.id_table = cpcusb_table,
};
static int cpcusb_create_info_output(char *buf)
{
int i = 0, j;
for (j = 0; j < CPC_USB_CARD_CNT; j++) {
if (CPCUSB_Table[j]) {
CPC_USB_T *card = CPCUSB_Table[j];
CPC_CHAN_T *chan = card->chan;
/* MINOR CHANNELNO BUSNO SLOTNO */
i += sprintf(&buf[i], "%d %s\n", chan->minor,
card->serialNumber);
}
}
return i;
}
static int cpcusb_proc_read_info(char *page, char **start, off_t off,
int count, int *eof, void *data)
{
int len = cpcusb_create_info_output(page);
if (len <= off + count)
*eof = 1;
*start = page + off;
len -= off;
if (len > count)
len = count;
if (len < 0)
len = 0;
return len;
}
/*
* Remove CPC-USB and cleanup
*/
static inline void cpcusb_delete(CPC_USB_T *card)
{
if (card) {
if (card->chan) {
if (card->chan->buf)
vfree(card->chan->buf);
if (card->chan->CPCWait_q)
kfree(card->chan->CPCWait_q);
kfree(card->chan);
}
CPCUSB_Table[card->idx] = NULL;
kfree(card);
}
}
/*
* setup the interrupt IN endpoint of a specific CPC-USB device
*/
static int cpcusb_setup_intrep(CPC_USB_T *card)
{
int retval = 0;
struct usb_endpoint_descriptor *ep;
ep = &card->interface->altsetting[0].endpoint[card->num_intr_in].desc;
card->intr_in_buffer[0] = 0;
card->free_slots = 15; /* initial size */
/* setup the urb */
usb_fill_int_urb(card->intr_in_urb, card->udev,
usb_rcvintpipe(card->udev, card->num_intr_in),
card->intr_in_buffer,
sizeof(card->intr_in_buffer),
cpcusb_read_interrupt_callback,
card,
ep->bInterval);
card->intr_in_urb->status = 0; /* needed! */
/* submit the urb */
retval = usb_submit_urb(card->intr_in_urb, GFP_KERNEL);
if (retval)
err("%s - failed submitting intr urb, error %d", __func__,
retval);
return retval;
}
static int cpcusb_open(struct inode *inode, struct file *file)
{
CPC_USB_T *card = NULL;
struct usb_interface *interface;
int subminor;
int j, retval = 0;
subminor = iminor(inode);
/* prevent disconnects */
down(&disconnect_sem);
interface = usb_find_interface(&cpcusb_driver, subminor);
if (!interface) {
err("%s - error, can't find device for minor %d",
__func__, subminor);
retval = CPC_ERR_NO_INTERFACE_PRESENT;
goto exit_no_device;
}
card = usb_get_intfdata(interface);
if (!card) {
retval = CPC_ERR_NO_INTERFACE_PRESENT;
goto exit_no_device;
}
/* lock this device */
down(&card->sem);
/* increment our usage count for the driver */
if (card->open) {
dbg("device already opened");
retval = CPC_ERR_CHANNEL_ALREADY_OPEN;
goto exit_on_error;
}
/* save our object in the file's private structure */
file->private_data = card;
for (j = 0; j < CPC_USB_URB_CNT; j++) {
usb_fill_bulk_urb(card->urbs[j].urb, card->udev,
usb_rcvbulkpipe(card->udev, card->num_bulk_in),
card->urbs[j].buffer, card->urbs[j].size,
cpcusb_read_bulk_callback, card);
retval = usb_submit_urb(card->urbs[j].urb, GFP_KERNEL);
if (retval) {
err("%s - failed submitting read urb, error %d",
__func__, retval);
retval = CPC_ERR_TRANSMISSION_FAILED;
goto exit_on_error;
}
}
info("%s - %d URB's submitted", __func__, j);
ResetBuffer(card->chan);
cpcusb_setup_intrep(card);
card->open = 1;
atomic_inc(&useCount);
exit_on_error:
/* unlock this device */
up(&card->sem);
exit_no_device:
up(&disconnect_sem);
return retval;
}
static unsigned int cpcusb_poll(struct file *file, poll_table * wait)
{
CPC_USB_T *card = (CPC_USB_T *) file->private_data;
unsigned int retval = 0;
if (!card) {
err("%s - device object lost", __func__);
return -EIO;
}
poll_wait(file, card->chan->CPCWait_q, wait);
if (IsBufferNotEmpty(card->chan) || !(card->present))
retval |= (POLLIN | POLLRDNORM);
if (card->free_slots)
retval |= (POLLOUT | POLLWRNORM);
return retval;
}
static int cpcusb_release(struct inode *inode, struct file *file)
{
CPC_USB_T *card = (CPC_USB_T *) file->private_data;
int j, retval = 0;
if (card == NULL) {
dbg("%s - object is NULL", __func__);
return CPC_ERR_NO_INTERFACE_PRESENT;
}
/* lock our device */
down(&card->sem);
if (!card->open) {
dbg("%s - device not opened", __func__);
retval = CPC_ERR_NO_INTERFACE_PRESENT;
goto exit_not_opened;
}
/* if device wasn't unplugged kill all urbs */
if (card->present) {
/* kill read urbs */
for (j = 0; j < CPC_USB_URB_CNT; j++) {
usb_kill_urb(card->urbs[j].urb);
}
/* kill irq urb */
usb_kill_urb(card->intr_in_urb);
/* kill write urbs */
for (j = 0; j < CPC_USB_URB_CNT; j++) {
if (atomic_read(&card->wrUrbs[j].busy)) {
usb_kill_urb(card->wrUrbs[j].urb);
wait_for_completion(&card->wrUrbs[j].finished);
}
}
}
atomic_dec(&useCount);
/* last process detached */
if (atomic_read(&useCount) == 0) {
wake_up(&rmmodWq);
}
if (!card->present && card->open) {
/* the device was unplugged before the file was released */
up(&card->sem);
cpcusb_delete(card);
return 0;
}
card->open = 0;
exit_not_opened:
up(&card->sem);
return 0;
}
static ssize_t cpcusb_read(struct file *file, char *buffer, size_t count,
loff_t *ppos)
{
CPC_USB_T *card = (CPC_USB_T *) file->private_data;
CPC_CHAN_T *chan;
int retval = 0;
if (count < sizeof(CPC_MSG_T))
return CPC_ERR_UNKNOWN;
/* check if can read from the given address */
if (!access_ok(VERIFY_WRITE, buffer, count))
return CPC_ERR_UNKNOWN;
/* lock this object */
down(&card->sem);
/* verify that the device wasn't unplugged */
if (!card->present) {
up(&card->sem);
return CPC_ERR_NO_INTERFACE_PRESENT;
}
if (IsBufferEmpty(card->chan)) {
retval = 0;
} else {
chan = card->chan;
#if 0
/* convert LPC2119 params back to SJA1000 params */
if (card->deviceRevision >= 0x0200
&& chan->buf[chan->oidx].type == CPC_MSG_T_CAN_PRMS) {
LPC2119_TO_SJA1000_Params(&chan->buf[chan->oidx]);
}
#endif
if (copy_to_user(buffer, &chan->buf[chan->oidx], count) != 0) {
retval = CPC_ERR_IO_TRANSFER;
} else {
chan->oidx = (chan->oidx + 1) % CPC_MSG_BUF_CNT;
chan->WnR = 1;
retval = sizeof(CPC_MSG_T);
}
}
/* spin_unlock_irqrestore(&card->slock, flags); */
/* unlock the device */
up(&card->sem);
return retval;
}
#define SHIFT 1
static inline void cpcusb_align_buffer_alignment(unsigned char *buf)
{
/* CPC-USB uploads packed bytes. */
CPC_MSG_T *cpc = (CPC_MSG_T *) buf;
unsigned int i;
for (i = 0; i < cpc->length + (2 * sizeof(unsigned long)); i++) {
((unsigned char *) &cpc->msgid)[1 + i] =
((unsigned char *) &cpc->msgid)[1 + SHIFT + i];
}
}
static int cpc_get_buffer_count(CPC_CHAN_T *chan)
{
/* check the buffer parameters */
if (chan->iidx == chan->oidx)
return !chan->WnR ? CPC_MSG_BUF_CNT : 0;
else if (chan->iidx >= chan->oidx)
return (chan->iidx - chan->oidx) % CPC_MSG_BUF_CNT;
return (chan->iidx + CPC_MSG_BUF_CNT - chan->oidx) % CPC_MSG_BUF_CNT;
}
static ssize_t cpcusb_write(struct file *file, const char *buffer,
size_t count, loff_t *ppos)
{
CPC_USB_T *card = (CPC_USB_T *) file->private_data;
CPC_USB_WRITE_URB_T *wrUrb = NULL;
ssize_t bytes_written = 0;
int retval = 0;
int j;
unsigned char *obuf = NULL;
unsigned char type = 0;
CPC_MSG_T *info = NULL;
dbg("%s - entered minor %d, count = %d, present = %d",
__func__, card->minor, count, card->present);
if (count > sizeof(CPC_MSG_T))
return CPC_ERR_UNKNOWN;
/* check if can read from the given address */
if (!access_ok(VERIFY_READ, buffer, count))
return CPC_ERR_UNKNOWN;
/* lock this object */
down(&card->sem);
/* verify that the device wasn't unplugged */
if (!card->present) {
retval = CPC_ERR_NO_INTERFACE_PRESENT;
goto exit;
}
/* verify that we actually have some data to write */
if (count == 0) {
dbg("%s - write request of 0 bytes", __func__);
goto exit;
}
if (card->free_slots <= 5) {
info = (CPC_MSG_T *) buffer;
if (info->type != CPC_CMD_T_CLEAR_CMD_QUEUE
|| card->free_slots <= 0) {
dbg("%s - send buffer full please try again %d",
__func__, card->free_slots);
retval = CPC_ERR_CAN_NO_TRANSMIT_BUF;
goto exit;
}
}
/* Find a free write urb */
for (j = 0; j < CPC_USB_URB_CNT; j++) {
if (!atomic_read(&card->wrUrbs[j].busy)) {
wrUrb = &card->wrUrbs[j]; /* remember found URB */
atomic_set(&wrUrb->busy, 1); /* lock this URB */
init_completion(&wrUrb->finished); /* init completion */
dbg("WR URB no. %d started", j);
break;
}
}
/* don't found write urb say error */
if (!wrUrb) {
dbg("%s - no free send urb available", __func__);
retval = CPC_ERR_CAN_NO_TRANSMIT_BUF;
goto exit;
}
dbg("URB write req");
obuf = (unsigned char *) wrUrb->urb->transfer_buffer;
/* copy the data from userspace into our transfer buffer;
* this is the only copy required.
*/
if (copy_from_user(&obuf[4], buffer, count) != 0) {
atomic_set(&wrUrb->busy, 0); /* release urb */
retval = CPC_ERR_IO_TRANSFER;
goto exit;
}
/* check if it is a DRIVER information message, so we can
* response to that message and not the USB
*/
info = (CPC_MSG_T *) &obuf[4];
bytes_written = 11 + info->length;
if (bytes_written >= wrUrb->size) {
retval = CPC_ERR_IO_TRANSFER;
goto exit;
}
switch (info->type) {
case CPC_CMD_T_CLEAR_MSG_QUEUE:
ResetBuffer(card->chan);
break;
case CPC_CMD_T_INQ_MSG_QUEUE_CNT:
retval = cpc_get_buffer_count(card->chan);
atomic_set(&wrUrb->busy, 0);
goto exit;
case CPC_CMD_T_INQ_INFO:
if (info->msg.info.source == CPC_INFOMSG_T_DRIVER) {
/* release urb cause we'll use it for driver
* information
*/
atomic_set(&wrUrb->busy, 0);
if (IsBufferFull(card->chan)) {
retval = CPC_ERR_IO_TRANSFER;
goto exit;
}
/* it is a driver information request message and we have
* free rx slots to store the response
*/
type = info->msg.info.type;
info = &card->chan->buf[card->chan->iidx];
info->type = CPC_MSG_T_INFO;
info->msg.info.source = CPC_INFOMSG_T_DRIVER;
info->msg.info.type = type;
switch (type) {
case CPC_INFOMSG_T_VERSION:
info->length = strlen(CPC_DRIVER_VERSION) + 2;
sprintf(info->msg.info.msg, "%s\n",
CPC_DRIVER_VERSION);
break;
case CPC_INFOMSG_T_SERIAL:
info->length = strlen(CPC_DRIVER_SERIAL) + 2;
sprintf(info->msg.info.msg, "%s\n",
CPC_DRIVER_SERIAL);
break;
default:
info->length = 2;
info->msg.info.type =
CPC_INFOMSG_T_UNKNOWN_TYPE;
}
card->chan->WnR = 0;
card->chan->iidx =
(card->chan->iidx + 1) % CPC_MSG_BUF_CNT;
retval = info->length;
goto exit;
}
break;
case CPC_CMD_T_CAN_PRMS:
/* Check the controller type. If it's the new CPC-USB, make sure if these are SJA1000 params */
if (info->msg.canparams.cc_type != SJA1000
&& info->msg.canparams.cc_type != M16C_BASIC
&& (card->productId == USB_CPCUSB_LPC2119_PRODUCT_ID
&& info->msg.canparams.cc_type != SJA1000)) {
/* don't forget to release the urb */
atomic_set(&wrUrb->busy, 0);
retval = CPC_ERR_WRONG_CONTROLLER_TYPE;
goto exit;
}
break;
}
/* just convert the params if it is an old CPC-USB with M16C controller */
if (card->productId == USB_CPCUSB_M16C_PRODUCT_ID) {
/* if it is a parameter message convert it from SJA1000 controller
* settings to M16C Basic controller settings
*/
SJA1000_TO_M16C_BASIC_Params((CPC_MSG_T *) &obuf[4]);
}
/* don't forget the byte alignment */
cpcusb_align_buffer_alignment(&obuf[4]);
/* setup a the 4 byte header */
obuf[0] = obuf[1] = obuf[2] = obuf[3] = 0;
/* this urb was already set up, except for this write size */
wrUrb->urb->transfer_buffer_length = bytes_written + 4;
/* send the data out the bulk port */
/* a character device write uses GFP_KERNEL,
unless a spinlock is held */
retval = usb_submit_urb(wrUrb->urb, GFP_KERNEL);
if (retval) {
atomic_set(&wrUrb->busy, 0); /* release urb */
err("%s - failed submitting write urb, error %d",
__func__, retval);
} else {
retval = bytes_written;
}
exit:
/* unlock the device */
up(&card->sem);
dbg("%s - leaved", __func__);
return retval;
}
/*
* callback for interrupt IN urb
*/
static void cpcusb_read_interrupt_callback(struct urb *urb)
{
CPC_USB_T *card = (CPC_USB_T *) urb->context;
int retval;
unsigned long flags;
spin_lock_irqsave(&card->slock, flags);
if (!card->present) {
spin_unlock_irqrestore(&card->slock, flags);
info("%s - no such device", __func__);
return;
}
switch (urb->status) {
case 0: /* success */
card->free_slots = card->intr_in_buffer[1];
break;
case -ECONNRESET:
case -ENOENT:
case -ESHUTDOWN:
/* urb was killed */
spin_unlock_irqrestore(&card->slock, flags);
dbg("%s - intr urb killed", __func__);
return;
default:
info("%s - nonzero urb status %d", __func__, urb->status);
break;
}
retval = usb_submit_urb(urb, GFP_ATOMIC);
if (retval) {
err("%s - failed resubmitting intr urb, error %d",
__func__, retval);
}
spin_unlock_irqrestore(&card->slock, flags);
wake_up_interruptible(card->chan->CPCWait_q);
return;
}
#define UN_SHIFT 1
#define CPCMSG_HEADER_LEN_FIRMWARE 11
static inline int cpcusb_unalign_and_copy_buffy(unsigned char *out,
unsigned char *in)
{
unsigned int i, j;
for (i = 0; i < 3; i++)
out[i] = in[i];
for (j = 0; j < (in[1] + (CPCMSG_HEADER_LEN_FIRMWARE - 3)); j++)
out[j + i + UN_SHIFT] = in[j + i];
return i + j;
}
/*
* callback for bulk IN urb
*/
static void cpcusb_read_bulk_callback(struct urb *urb)
{
CPC_USB_T *card = (CPC_USB_T *) urb->context;
CPC_CHAN_T *chan;
unsigned char *ibuf = urb->transfer_buffer;
int retval, msgCnt, start, again = 0;
unsigned long flags;
if (!card) {
err("%s - device object lost", __func__);
return;
}
spin_lock_irqsave(&card->slock, flags);
if (!card->present) {
spin_unlock_irqrestore(&card->slock, flags);
info("%s - no such device", __func__);
return;
}
switch (urb->status) {
case 0: /* success */
break;
case -ECONNRESET:
case -ENOENT:
case -ESHUTDOWN:
/* urb was killed */
spin_unlock_irqrestore(&card->slock, flags);
dbg("%s - read urb killed", __func__);
return;
default:
info("%s - nonzero urb status %d", __func__, urb->status);
break;
}
if (urb->actual_length) {
msgCnt = ibuf[0] & ~0x80;
again = ibuf[0] & 0x80;
/* we have a 4 byte header */
start = 4;
chan = card->chan;
while (msgCnt) {
if (!(IsBufferFull(card->chan))) {
start +=
cpcusb_unalign_and_copy_buffy((unsigned char *)
&chan->buf[chan->iidx], &ibuf[start]);
if (start > urb->transfer_buffer_length) {
err("%d > %d", start, urb->transfer_buffer_length);
break;
}
chan->WnR = 0;
chan->iidx = (chan->iidx + 1) % CPC_MSG_BUF_CNT;
msgCnt--;
} else {
break;
}
}
}
usb_fill_bulk_urb(urb, card->udev,
usb_rcvbulkpipe(card->udev, card->num_bulk_in),
urb->transfer_buffer,
urb->transfer_buffer_length,
cpcusb_read_bulk_callback, card);
retval = usb_submit_urb(urb, GFP_ATOMIC);
if (retval) {
err("%s - failed resubmitting read urb, error %d", __func__, retval);
}
spin_unlock_irqrestore(&card->slock, flags);
wake_up_interruptible(card->chan->CPCWait_q);
}
/*
* callback for bulk IN urb
*/
static void cpcusb_write_bulk_callback(struct urb *urb)
{
CPC_USB_T *card = (CPC_USB_T *) urb->context;
unsigned long flags;
int j;
spin_lock_irqsave(&card->slock, flags);
/* find this urb */
for (j = 0; j < CPC_USB_URB_CNT; j++) {
if (card->wrUrbs[j].urb == urb) {
dbg("URB found no. %d", j);
/* notify anyone waiting that the write has finished */
complete(&card->wrUrbs[j].finished);
atomic_set(&card->wrUrbs[j].busy, 0);
break;
}
}
switch (urb->status) {
case 0: /* success */
break;
case -ECONNRESET:
case -ENOENT:
case -ESHUTDOWN:
/* urb was killed */
spin_unlock_irqrestore(&card->slock, flags);
dbg("%s - write urb no. %d killed", __func__, j);
return;
default:
info("%s - nonzero urb status %d", __func__, urb->status);
break;
}
spin_unlock_irqrestore(&card->slock, flags);
wake_up_interruptible(card->chan->CPCWait_q);
}
static inline int cpcusb_get_free_slot(void)
{
int i;
for (i = 0; i < CPC_USB_CARD_CNT; i++) {
if (!CPCUSB_Table[i])
return i;
}
return -1;
}
/*
* probe function for new CPC-USB devices
*/
static int cpcusb_probe(struct usb_interface *interface,
const struct usb_device_id *id)
{
CPC_USB_T *card = NULL;
CPC_CHAN_T *chan = NULL;
struct usb_device *udev = interface_to_usbdev(interface);
struct usb_host_interface *iface_desc;
struct usb_endpoint_descriptor *endpoint;
int i, j, retval = -ENOMEM, slot;
slot = cpcusb_get_free_slot();
if (slot < 0) {
info("No more devices supported");
return -ENOMEM;
}
/* allocate memory for our device state and initialize it */
card = kzalloc(sizeof(CPC_USB_T), GFP_KERNEL);
if (!card) {
err("Out of memory");
return -ENOMEM;
}
CPCUSB_Table[slot] = card;
/* allocate and initialize the channel struct */
card->chan = kmalloc(sizeof(CPC_CHAN_T), GFP_KERNEL);
if (!card->chan) {
kfree(card);
err("Out of memory");
return -ENOMEM;
}
chan = card->chan;
memset(chan, 0, sizeof(CPC_CHAN_T));
ResetBuffer(chan);
init_MUTEX(&card->sem);
spin_lock_init(&card->slock);
card->udev = udev;
card->interface = interface;
if (udev->descriptor.iSerialNumber) {
usb_string(udev, udev->descriptor.iSerialNumber, card->serialNumber,
128);
info("Serial %s", card->serialNumber);
}
card->productId = udev->descriptor.idProduct;
info("Product %s",
card->productId == USB_CPCUSB_LPC2119_PRODUCT_ID ?
"CPC-USB/ARM7" : "CPC-USB/M16C");
/* set up the endpoint information */
/* check out the endpoints */
/* use only the first bulk-in and bulk-out endpoints */
iface_desc = &interface->altsetting[0];
for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
endpoint = &iface_desc->endpoint[i].desc;
if (!card->num_intr_in &&
(endpoint->bEndpointAddress & USB_DIR_IN) &&
((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
== USB_ENDPOINT_XFER_INT)) {
card->intr_in_urb = usb_alloc_urb(0, GFP_KERNEL);
card->num_intr_in = 1;
if (!card->intr_in_urb) {
err("No free urbs available");
goto error;
}
dbg("intr_in urb %d", card->num_intr_in);
}
if (!card->num_bulk_in &&
(endpoint->bEndpointAddress & USB_DIR_IN) &&
((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
== USB_ENDPOINT_XFER_BULK)) {
card->num_bulk_in = 2;
for (j = 0; j < CPC_USB_URB_CNT; j++) {
card->urbs[j].size = endpoint->wMaxPacketSize;
card->urbs[j].urb = usb_alloc_urb(0, GFP_KERNEL);
if (!card->urbs[j].urb) {
err("No free urbs available");
goto error;
}
card->urbs[j].buffer =
usb_buffer_alloc(udev,
card->urbs[j].size,
GFP_KERNEL,
&card->urbs[j].urb->transfer_dma);
if (!card->urbs[j].buffer) {
err("Couldn't allocate bulk_in_buffer");
goto error;
}
}
info("%s - %d reading URB's allocated",
__func__, CPC_USB_URB_CNT);
}
if (!card->num_bulk_out &&
!(endpoint->bEndpointAddress & USB_DIR_IN) &&
((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
== USB_ENDPOINT_XFER_BULK)) {
card->num_bulk_out = 2;
for (j = 0; j < CPC_USB_URB_CNT; j++) {
card->wrUrbs[j].size =
endpoint->wMaxPacketSize;
card->wrUrbs[j].urb =
usb_alloc_urb(0, GFP_KERNEL);
if (!card->wrUrbs[j].urb) {
err("No free urbs available");
goto error;
}
card->wrUrbs[j].buffer = usb_buffer_alloc(udev,
card->wrUrbs[j].size, GFP_KERNEL,
&card->wrUrbs[j].urb->transfer_dma);
if (!card->wrUrbs[j].buffer) {
err("Couldn't allocate bulk_out_buffer");
goto error;
}
usb_fill_bulk_urb(card->wrUrbs[j].urb, udev,
usb_sndbulkpipe(udev, endpoint->bEndpointAddress),
card->wrUrbs[j].buffer,
card->wrUrbs[j].size,
cpcusb_write_bulk_callback,
card);
}
info("%s - %d writing URB's allocated", __func__, CPC_USB_URB_CNT);
}
}
if (!(card->num_bulk_in && card->num_bulk_out)) {
err("Couldn't find both bulk-in and bulk-out endpoints");
goto error;
}
/* allow device read, write and ioctl */
card->present = 1;
/* we can register the device now, as it is ready */
usb_set_intfdata(interface, card);
retval = usb_register_dev(interface, &cpcusb_class);
if (retval) {
/* something prevented us from registering this driver */
err("Not able to get a minor for this device.");
usb_set_intfdata(interface, NULL);
goto error;
}
card->chan->minor = card->minor = interface->minor;
chan->buf = vmalloc(sizeof(CPC_MSG_T) * CPC_MSG_BUF_CNT);
if (chan->buf == NULL) {
err("Out of memory");
retval = -ENOMEM;
goto error;
}
info("Allocated memory for %d messages (%d kbytes)",
CPC_MSG_BUF_CNT, (sizeof(CPC_MSG_T) * CPC_MSG_BUF_CNT) / 1000);
memset(chan->buf, 0, sizeof(CPC_MSG_T) * CPC_MSG_BUF_CNT);
ResetBuffer(chan);
card->chan->CPCWait_q = kmalloc(sizeof(wait_queue_head_t), GFP_KERNEL);
if (!card->chan->CPCWait_q) {
err("Out of memory");
retval = -ENOMEM;
goto error;
}
init_waitqueue_head(card->chan->CPCWait_q);
CPCUSB_Table[slot] = card;
card->idx = slot;
CPCUsbCnt++;
/* let the user know what node this device is now attached to */
info("Device now attached to USB-%d", card->minor);
return 0;
error:
for (j = 0; j < CPC_USB_URB_CNT; j++) {
if (card->urbs[j].buffer) {
usb_buffer_free(card->udev, card->urbs[j].size,
card->urbs[j].buffer,
card->urbs[j].urb->transfer_dma);
card->urbs[j].buffer = NULL;
}
if (card->urbs[j].urb) {
usb_free_urb(card->urbs[j].urb);
card->urbs[j].urb = NULL;
}
}
cpcusb_delete(card);
return retval;
}
/*
* called by the usb core when the device is removed from the system
*/
static void cpcusb_disconnect(struct usb_interface *interface)
{
CPC_USB_T *card = NULL;
int minor, j;
/* prevent races with open() */
down(&disconnect_sem);
card = usb_get_intfdata(interface);
usb_set_intfdata(interface, NULL);
down(&card->sem);
/* prevent device read, write and ioctl */
card->present = 0;
minor = card->minor;
/* free all urbs and their buffers */
for (j = 0; j < CPC_USB_URB_CNT; j++) {
/* terminate an ongoing write */
if (atomic_read(&card->wrUrbs[j].busy)) {
usb_kill_urb(card->wrUrbs[j].urb);
wait_for_completion(&card->wrUrbs[j].finished);
}
usb_buffer_free(card->udev, card->wrUrbs[j].size,
card->wrUrbs[j].buffer,
card->wrUrbs[j].urb->transfer_dma);
usb_free_urb(card->wrUrbs[j].urb);
}
info("%d write URBs freed", CPC_USB_URB_CNT);
/* free all urbs and their buffers */
for (j = 0; j < CPC_USB_URB_CNT; j++) {
usb_buffer_free(card->udev, card->urbs[j].size,
card->urbs[j].buffer,
card->urbs[j].urb->transfer_dma);
usb_free_urb(card->urbs[j].urb);
}
info("%d read URBs freed", CPC_USB_URB_CNT);
usb_free_urb(card->intr_in_urb);
/* give back our minor */
usb_deregister_dev(interface, &cpcusb_class);
up(&card->sem);
/* if the device is opened, cpcusb_release will clean this up */
if (!card->open)
cpcusb_delete(card);
else
wake_up_interruptible(card->chan->CPCWait_q);
up(&disconnect_sem);
CPCUsbCnt--;
info("USB-%d now disconnected", minor);
}
static int __init CPCUsb_Init(void)
{
int result, i;
info(DRIVER_DESC " v" DRIVER_VERSION);
info("Build on " __DATE__ " at " __TIME__);
for (i = 0; i < CPC_USB_CARD_CNT; i++)
CPCUSB_Table[i] = 0;
/* register this driver with the USB subsystem */
result = usb_register(&cpcusb_driver);
if (result) {
err("usb_register failed. Error number %d", result);
return result;
}
procDir = proc_mkdir(CPC_USB_PROC_DIR, NULL);
if (!procDir) {
err("Could not create proc entry");
} else {
procEntry = create_proc_read_entry("info", 0444, procDir,
cpcusb_proc_read_info,
NULL);
if (!procEntry) {
err("Could not create proc entry %s", CPC_USB_PROC_DIR "/info");
remove_proc_entry(CPC_USB_PROC_DIR, NULL);
procDir = NULL;
}
}
return 0;
}
static void __exit CPCUsb_Exit(void)
{
wait_event(rmmodWq, !atomic_read(&useCount));
/* deregister this driver with the USB subsystem */
usb_deregister(&cpcusb_driver);
if (procDir) {
if (procEntry)
remove_proc_entry("info", procDir);
remove_proc_entry(CPC_USB_PROC_DIR, NULL);
}
}
module_init(CPCUsb_Init);
module_exit(CPCUsb_Exit);
|