diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2009-06-19 17:48:32 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-06-19 17:48:32 -0700 |
commit | fb20871a54961b82d35303b43452928186c1361d (patch) | |
tree | 1beeb39e45eda1c8b5893090904b583fceeb07ef /drivers/staging/cpc-usb/cpc-usb_drv.c | |
parent | bee89ab228e6f51c4ddd3481b9bd491859a8ee7b (diff) | |
parent | c7a5d70796379e3d51d0c652fbe1634b81d3bbd5 (diff) |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging-2.6
* git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging-2.6: (342 commits)
Staging: comedi: fix build errors
Staging: udlfb: update to version 0.2.3
Staging: udlfb: fix some sparse warnings.
Staging: udlfb: clean up checkpatch warnings in udlfb.c
Staging: udlfb: clean up checkpatch warnings in udlfb.h
Staging: udlfb: add udlfb driver to build
Staging: add udlfb driver
Staging: pata_rdc: remove pointless comments
Staging: pata_rdc: remove DRIVER macros
Staging: pata_rdc: remove dbgprintf macro
Staging: pata_rdc: remove broken flag
Staging: pata_rdc: fix build warnings
Staging: pata_rdc: use PCI_DEVICE
Staging: pata_rdc: remove function prototypes
Staging: pata_rdc: coding style fixes
Staging: pata_rdc: convert code to work in 2.6.29
Staging: pata_rdc: add driver to the build system
Staging: add pata_rdc driver
Staging: remove obsolete serqt_usb driver
Staging: serqt_usb2 add the driver to the build
...
Diffstat (limited to 'drivers/staging/cpc-usb/cpc-usb_drv.c')
-rw-r--r-- | drivers/staging/cpc-usb/cpc-usb_drv.c | 1185 |
1 files changed, 1185 insertions, 0 deletions
diff --git a/drivers/staging/cpc-usb/cpc-usb_drv.c b/drivers/staging/cpc-usb/cpc-usb_drv.c new file mode 100644 index 00000000000..9bf3f98c682 --- /dev/null +++ b/drivers/staging/cpc-usb/cpc-usb_drv.c @@ -0,0 +1,1185 @@ +/* + * 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> + +#include <linux/proc_fs.h> + +#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 + +#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 = %zu, 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 (%lu kbytes)", + CPC_MSG_BUF_CNT, (long unsigned int)(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); |