diff options
Diffstat (limited to 'drivers/usb/misc/auerswald.c')
| -rw-r--r-- | drivers/usb/misc/auerswald.c | 2163 |
1 files changed, 2163 insertions, 0 deletions
diff --git a/drivers/usb/misc/auerswald.c b/drivers/usb/misc/auerswald.c new file mode 100644 index 00000000000..a530bb976e4 --- /dev/null +++ b/drivers/usb/misc/auerswald.c @@ -0,0 +1,2163 @@ +/*****************************************************************************/ +/* + * auerswald.c -- Auerswald PBX/System Telephone usb driver. + * + * Copyright (C) 2001 Wolfgang Mües (wolfgang@iksw-muees.de) + * + * Very much code of this driver is borrowed from dabusb.c (Deti Fliegl) + * and from the USB Skeleton driver (Greg Kroah-Hartman). Thank you. + * + * 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 this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + /*****************************************************************************/ + +/* Standard Linux module include files */ +#include <asm/uaccess.h> +#include <asm/byteorder.h> +#include <linux/slab.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/wait.h> +#undef DEBUG /* include debug macros until it's done */ +#include <linux/usb.h> + +/*-------------------------------------------------------------------*/ +/* Debug support */ +#ifdef DEBUG +#define dump( adr, len) \ +do { \ + unsigned int u; \ + printk (KERN_DEBUG); \ + for (u = 0; u < len; u++) \ + printk (" %02X", adr[u] & 0xFF); \ + printk ("\n"); \ +} while (0) +#else +#define dump( adr, len) +#endif + +/*-------------------------------------------------------------------*/ +/* Version Information */ +#define DRIVER_VERSION "0.9.11" +#define DRIVER_AUTHOR "Wolfgang Mües <wolfgang@iksw-muees.de>" +#define DRIVER_DESC "Auerswald PBX/System Telephone usb driver" + +/*-------------------------------------------------------------------*/ +/* Private declarations for Auerswald USB driver */ + +/* Auerswald Vendor ID */ +#define ID_AUERSWALD 0x09BF + +#define AUER_MINOR_BASE 112 /* auerswald driver minor number */ + +/* we can have up to this number of device plugged in at once */ +#define AUER_MAX_DEVICES 16 + + +/* Number of read buffers for each device */ +#define AU_RBUFFERS 10 + +/* Number of chain elements for each control chain */ +#define AUCH_ELEMENTS 20 + +/* Number of retries in communication */ +#define AU_RETRIES 10 + +/*-------------------------------------------------------------------*/ +/* vendor specific protocol */ +/* Header Byte */ +#define AUH_INDIRMASK 0x80 /* mask for direct/indirect bit */ +#define AUH_DIRECT 0x00 /* data is for USB device */ +#define AUH_INDIRECT 0x80 /* USB device is relay */ + +#define AUH_SPLITMASK 0x40 /* mask for split bit */ +#define AUH_UNSPLIT 0x00 /* data block is full-size */ +#define AUH_SPLIT 0x40 /* data block is part of a larger one, + split-byte follows */ + +#define AUH_TYPEMASK 0x3F /* mask for type of data transfer */ +#define AUH_TYPESIZE 0x40 /* different types */ +#define AUH_DCHANNEL 0x00 /* D channel data */ +#define AUH_B1CHANNEL 0x01 /* B1 channel transparent */ +#define AUH_B2CHANNEL 0x02 /* B2 channel transparent */ +/* 0x03..0x0F reserved for driver internal use */ +#define AUH_COMMAND 0x10 /* Command channel */ +#define AUH_BPROT 0x11 /* Configuration block protocol */ +#define AUH_DPROTANA 0x12 /* D channel protocol analyzer */ +#define AUH_TAPI 0x13 /* telephone api data (ATD) */ +/* 0x14..0x3F reserved for other protocols */ +#define AUH_UNASSIGNED 0xFF /* if char device has no assigned service */ +#define AUH_FIRSTUSERCH 0x11 /* first channel which is available for driver users */ + +#define AUH_SIZE 1 /* Size of Header Byte */ + +/* Split Byte. Only present if split bit in header byte set.*/ +#define AUS_STARTMASK 0x80 /* mask for first block of splitted frame */ +#define AUS_FIRST 0x80 /* first block */ +#define AUS_FOLLOW 0x00 /* following block */ + +#define AUS_ENDMASK 0x40 /* mask for last block of splitted frame */ +#define AUS_END 0x40 /* last block */ +#define AUS_NOEND 0x00 /* not the last block */ + +#define AUS_LENMASK 0x3F /* mask for block length information */ + +/* Request types */ +#define AUT_RREQ (USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_OTHER) /* Read Request */ +#define AUT_WREQ (USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_OTHER) /* Write Request */ + +/* Vendor Requests */ +#define AUV_GETINFO 0x00 /* GetDeviceInfo */ +#define AUV_WBLOCK 0x01 /* Write Block */ +#define AUV_RBLOCK 0x02 /* Read Block */ +#define AUV_CHANNELCTL 0x03 /* Channel Control */ +#define AUV_DUMMY 0x04 /* Dummy Out for retry */ + +/* Device Info Types */ +#define AUDI_NUMBCH 0x0000 /* Number of supported B channels */ +#define AUDI_OUTFSIZE 0x0001 /* Size of OUT B channel fifos */ +#define AUDI_MBCTRANS 0x0002 /* max. Blocklength of control transfer */ + +/* Interrupt endpoint definitions */ +#define AU_IRQENDP 1 /* Endpoint number */ +#define AU_IRQCMDID 16 /* Command-block ID */ +#define AU_BLOCKRDY 0 /* Command: Block data ready on ctl endpoint */ +#define AU_IRQMINSIZE 5 /* Nr. of bytes decoded in this driver */ + +/* Device String Descriptors */ +#define AUSI_VENDOR 1 /* "Auerswald GmbH & Co. KG" */ +#define AUSI_DEVICE 2 /* Name of the Device */ +#define AUSI_SERIALNR 3 /* Serial Number */ +#define AUSI_MSN 4 /* "MSN ..." (first) Multiple Subscriber Number */ + +#define AUSI_DLEN 100 /* Max. Length of Device Description */ + +#define AUV_RETRY 0x101 /* First Firmware version which can do control retries */ + +/*-------------------------------------------------------------------*/ +/* External data structures / Interface */ +typedef struct +{ + char __user *buf; /* return buffer for string contents */ + unsigned int bsize; /* size of return buffer */ +} audevinfo_t,*paudevinfo_t; + +/* IO controls */ +#define IOCTL_AU_SLEN _IOR( 'U', 0xF0, int) /* return the max. string descriptor length */ +#define IOCTL_AU_DEVINFO _IOWR('U', 0xF1, audevinfo_t) /* get name of a specific device */ +#define IOCTL_AU_SERVREQ _IOW( 'U', 0xF2, int) /* request a service channel */ +#define IOCTL_AU_BUFLEN _IOR( 'U', 0xF3, int) /* return the max. buffer length for the device */ +#define IOCTL_AU_RXAVAIL _IOR( 'U', 0xF4, int) /* return != 0 if Receive Data available */ +#define IOCTL_AU_CONNECT _IOR( 'U', 0xF5, int) /* return != 0 if connected to a service channel */ +#define IOCTL_AU_TXREADY _IOR( 'U', 0xF6, int) /* return != 0 if Transmitt channel ready to send */ +/* 'U' 0xF7..0xFF reseved */ + +/*-------------------------------------------------------------------*/ +/* Internal data structures */ + +/* ..................................................................*/ +/* urb chain element */ +struct auerchain; /* forward for circular reference */ +typedef struct +{ + struct auerchain *chain; /* pointer to the chain to which this element belongs */ + struct urb * urbp; /* pointer to attached urb */ + void *context; /* saved URB context */ + usb_complete_t complete; /* saved URB completion function */ + struct list_head list; /* to include element into a list */ +} auerchainelement_t,*pauerchainelement_t; + +/* urb chain */ +typedef struct auerchain +{ + pauerchainelement_t active; /* element which is submitted to urb */ + spinlock_t lock; /* protection agains interrupts */ + struct list_head waiting_list; /* list of waiting elements */ + struct list_head free_list; /* list of available elements */ +} auerchain_t,*pauerchain_t; + +/* urb blocking completion helper struct */ +typedef struct +{ + wait_queue_head_t wqh; /* wait for completion */ + unsigned int done; /* completion flag */ +} auerchain_chs_t,*pauerchain_chs_t; + +/* ...................................................................*/ +/* buffer element */ +struct auerbufctl; /* forward */ +typedef struct +{ + char *bufp; /* reference to allocated data buffer */ + unsigned int len; /* number of characters in data buffer */ + unsigned int retries; /* for urb retries */ + struct usb_ctrlrequest *dr; /* for setup data in control messages */ + struct urb * urbp; /* USB urb */ + struct auerbufctl *list; /* pointer to list */ + struct list_head buff_list; /* reference to next buffer in list */ +} auerbuf_t,*pauerbuf_t; + +/* buffer list control block */ +typedef struct auerbufctl +{ + spinlock_t lock; /* protection in interrupt */ + struct list_head free_buff_list;/* free buffers */ + struct list_head rec_buff_list; /* buffers with receive data */ +} auerbufctl_t,*pauerbufctl_t; + +/* ...................................................................*/ +/* service context */ +struct auerscon; /* forward */ +typedef void (*auer_dispatch_t)(struct auerscon*, pauerbuf_t); +typedef void (*auer_disconn_t) (struct auerscon*); +typedef struct auerscon +{ + unsigned int id; /* protocol service id AUH_xxxx */ + auer_dispatch_t dispatch; /* dispatch read buffer */ + auer_disconn_t disconnect; /* disconnect from device, wake up all char readers */ +} auerscon_t,*pauerscon_t; + +/* ...................................................................*/ +/* USB device context */ +typedef struct +{ + struct semaphore mutex; /* protection in user context */ + char name[20]; /* name of the /dev/usb entry */ + unsigned int dtindex; /* index in the device table */ + struct usb_device * usbdev; /* USB device handle */ + int open_count; /* count the number of open character channels */ + char dev_desc[AUSI_DLEN];/* for storing a textual description */ + unsigned int maxControlLength; /* max. Length of control paket (without header) */ + struct urb * inturbp; /* interrupt urb */ + char * intbufp; /* data buffer for interrupt urb */ + unsigned int irqsize; /* size of interrupt endpoint 1 */ + struct auerchain controlchain; /* for chaining of control messages */ + auerbufctl_t bufctl; /* Buffer control for control transfers */ + pauerscon_t services[AUH_TYPESIZE];/* context pointers for each service */ + unsigned int version; /* Version of the device */ + wait_queue_head_t bufferwait; /* wait for a control buffer */ +} auerswald_t,*pauerswald_t; + +/* ................................................................... */ +/* character device context */ +typedef struct +{ + struct semaphore mutex; /* protection in user context */ + pauerswald_t auerdev; /* context pointer of assigned device */ + auerbufctl_t bufctl; /* controls the buffer chain */ + auerscon_t scontext; /* service context */ + wait_queue_head_t readwait; /* for synchronous reading */ + struct semaphore readmutex; /* protection against multiple reads */ + pauerbuf_t readbuf; /* buffer held for partial reading */ + unsigned int readoffset; /* current offset in readbuf */ + unsigned int removed; /* is != 0 if device is removed */ +} auerchar_t,*pauerchar_t; + + +/*-------------------------------------------------------------------*/ +/* Forwards */ +static void auerswald_ctrlread_complete (struct urb * urb, struct pt_regs *regs); +static void auerswald_removeservice (pauerswald_t cp, pauerscon_t scp); +static struct usb_driver auerswald_driver; + + +/*-------------------------------------------------------------------*/ +/* USB chain helper functions */ +/* -------------------------- */ + +/* completion function for chained urbs */ +static void auerchain_complete (struct urb * urb, struct pt_regs *regs) +{ + unsigned long flags; + int result; + + /* get pointer to element and to chain */ + pauerchainelement_t acep = (pauerchainelement_t) urb->context; + pauerchain_t acp = acep->chain; + + /* restore original entries in urb */ + urb->context = acep->context; + urb->complete = acep->complete; + + dbg ("auerchain_complete called"); + + /* call original completion function + NOTE: this function may lead to more urbs submitted into the chain. + (no chain lock at calling complete()!) + acp->active != NULL is protecting us against recursion.*/ + urb->complete (urb, regs); + + /* detach element from chain data structure */ + spin_lock_irqsave (&acp->lock, flags); + if (acp->active != acep) /* paranoia debug check */ + dbg ("auerchain_complete: completion on non-active element called!"); + else + acp->active = NULL; + + /* add the used chain element to the list of free elements */ + list_add_tail (&acep->list, &acp->free_list); + acep = NULL; + + /* is there a new element waiting in the chain? */ + if (!acp->active && !list_empty (&acp->waiting_list)) { + /* yes: get the entry */ + struct list_head *tmp = acp->waiting_list.next; + list_del (tmp); + acep = list_entry (tmp, auerchainelement_t, list); + acp->active = acep; + } + spin_unlock_irqrestore (&acp->lock, flags); + + /* submit the new urb */ + if (acep) { + urb = acep->urbp; + dbg ("auerchain_complete: submitting next urb from chain"); + urb->status = 0; /* needed! */ + result = usb_submit_urb(urb, GFP_ATOMIC); + + /* check for submit errors */ + if (result) { + urb->status = result; + dbg("auerchain_complete: usb_submit_urb with error code %d", result); + /* and do error handling via *this* completion function (recursive) */ + auerchain_complete( urb, NULL); + } + } else { + /* simple return without submitting a new urb. + The empty chain is detected with acp->active == NULL. */ + }; +} + + +/* submit function for chained urbs + this function may be called from completion context or from user space! + early = 1 -> submit in front of chain +*/ +static int auerchain_submit_urb_list (pauerchain_t acp, struct urb * urb, int early) +{ + int result; + unsigned long flags; + pauerchainelement_t acep = NULL; + + dbg ("auerchain_submit_urb called"); + + /* try to get a chain element */ + spin_lock_irqsave (&acp->lock, flags); + if (!list_empty (&acp->free_list)) { + /* yes: get the entry */ + struct list_head *tmp = acp->free_list.next; + list_del (tmp); + acep = list_entry (tmp, auerchainelement_t, list); + } + spin_unlock_irqrestore (&acp->lock, flags); + + /* if no chain element available: return with error */ + if (!acep) { + return -ENOMEM; + } + + /* fill in the new chain element values */ + acep->chain = acp; + acep->context = urb->context; + acep->complete = urb->complete; + acep->urbp = urb; + INIT_LIST_HEAD (&acep->list); + + /* modify urb */ + urb->context = acep; + urb->complete = auerchain_complete; + urb->status = -EINPROGRESS; /* usb_submit_urb does this, too */ + + /* add element to chain - or start it immediately */ + spin_lock_irqsave (&acp->lock, flags); + if (acp->active) { + /* there is traffic in the chain, simple add element to chain */ + if (early) { + dbg ("adding new urb to head of chain"); + list_add (&acep->list, &acp->waiting_list); + } else { + dbg ("adding new urb to end of chain"); + list_add_tail (&acep->list, &acp->waiting_list); + } + acep = NULL; + } else { + /* the chain is empty. Prepare restart */ + acp->active = acep; + } + /* Spin has to be removed before usb_submit_urb! */ + spin_unlock_irqrestore (&acp->lock, flags); + + /* Submit urb if immediate restart */ + if (acep) { + dbg("submitting urb immediate"); + urb->status = 0; /* needed! */ + result = usb_submit_urb(urb, GFP_ATOMIC); + /* check for submit errors */ + if (result) { + urb->status = result; + dbg("auerchain_submit_urb: usb_submit_urb with error code %d", result); + /* and do error handling via completion function */ + auerchain_complete( urb, NULL); + } + } + + return 0; +} + +/* submit function for chained urbs + this function may be called from completion context or from user space! +*/ +static int auerchain_submit_urb (pauerchain_t acp, struct urb * urb) +{ + return auerchain_submit_urb_list (acp, urb, 0); +} + +/* cancel an urb which is submitted to the chain + the result is 0 if the urb is cancelled, or -EINPROGRESS if + URB_ASYNC_UNLINK is set and the function is successfully started. +*/ +static int auerchain_unlink_urb (pauerchain_t acp, struct urb * urb) +{ + unsigned long flags; + struct urb * urbp; + pauerchainelement_t acep; + struct list_head *tmp; + + dbg ("auerchain_unlink_urb called"); + + /* search the chain of waiting elements */ + spin_lock_irqsave (&acp->lock, flags); + list_for_each (tmp, &acp->waiting_list) { + acep = list_entry (tmp, auerchainelement_t, list); + if (acep->urbp == urb) { + list_del (tmp); + urb->context = acep->context; + urb->complete = acep->complete; + list_add_tail (&acep->list, &acp->free_list); + spin_unlock_irqrestore (&acp->lock, flags); + dbg ("unlink waiting urb"); + urb->status = -ENOENT; + urb->complete (urb, NULL); + return 0; + } + } + /* not found. */ + spin_unlock_irqrestore (&acp->lock, flags); + + /* get the active urb */ + acep = acp->active; + if (acep) { + urbp = acep->urbp; + + /* check if we have to cancel the active urb */ + if (urbp == urb) { + /* note that there is a race condition between the check above + and the unlink() call because of no lock. This race is harmless, + because the usb module will detect the unlink() after completion. + We can't use the acp->lock here because the completion function + wants to grab it. + */ + dbg ("unlink active urb"); + return usb_unlink_urb (urbp); + } + } + + /* not found anyway + ... is some kind of success + */ + dbg ("urb to unlink not found in chain"); + return 0; +} + +/* cancel all urbs which are in the chain. + this function must not be called from interrupt or completion handler. +*/ +static void auerchain_unlink_all (pauerchain_t acp) +{ + unsigned long flags; + struct urb * urbp; + pauerchainelement_t acep; + + dbg ("auerchain_unlink_all called"); + + /* clear the chain of waiting elements */ + spin_lock_irqsave (&acp->lock, flags); + while (!list_empty (&acp->waiting_list)) { + /* get the next entry */ + struct list_head *tmp = acp->waiting_list.next; + list_del (tmp); + acep = list_entry (tmp, auerchainelement_t, list); + urbp = acep->urbp; + urbp->context = acep->context; + urbp->complete = acep->complete; + list_add_tail (&acep->list, &acp->free_list); + spin_unlock_irqrestore (&acp->lock, flags); + dbg ("unlink waiting urb"); + urbp->status = -ENOENT; + urbp->complete (urbp, NULL); + spin_lock_irqsave (&acp->lock, flags); + } + spin_unlock_irqrestore (&acp->lock, flags); + + /* clear the active urb */ + acep = acp->active; + if (acep) { + urbp = acep->urbp; + urbp->transfer_flags &= ~URB_ASYNC_UNLINK; + dbg ("unlink active urb"); + usb_kill_urb (urbp); + } +} + + +/* free the chain. + this function must not be called from interrupt or completion handler. +*/ +static void auerchain_free (pauerchain_t acp) +{ + unsigned long flags; + pauerchainelement_t acep; + + dbg ("auerchain_free called"); + + /* first, cancel all pending urbs */ + auerchain_unlink_all (acp); + + /* free the elements */ + spin_lock_irqsave (&acp->lock, flags); + while (!list_empty (&acp->free_list)) { + /* get the next entry */ + struct list_head *tmp = acp->free_list.next; + list_del (tmp); + spin_unlock_irqrestore (&acp->lock, flags); + acep = list_entry (tmp, auerchainelement_t, list); + kfree (acep); + spin_lock_irqsave (&acp->lock, flags); + } + spin_unlock_irqrestore (&acp->lock, flags); +} + + +/* Init the chain control structure */ +static void auerchain_init (pauerchain_t acp) +{ + /* init the chain data structure */ + acp->active = NULL; + spin_lock_init (&acp->lock); + INIT_LIST_HEAD (&acp->waiting_list); + INIT_LIST_HEAD (&acp->free_list); +} + +/* setup a chain. + It is assumed that there is no concurrency while setting up the chain + requirement: auerchain_init() +*/ +static int auerchain_setup (pauerchain_t acp, unsigned int numElements) +{ + pauerchainelement_t acep; + + dbg ("auerchain_setup called with %d elements", numElements); + + /* fill the list of free elements */ + for (;numElements; numElements--) { + acep = (pauerchainelement_t) kmalloc (sizeof (auerchainelement_t), GFP_KERNEL); + if (!acep) + goto ac_fail; + memset (acep, 0, sizeof (auerchainelement_t)); + INIT_LIST_HEAD (&acep->list); + list_add_tail (&acep->list, &acp->free_list); + } + return 0; + +ac_fail:/* free the elements */ + while (!list_empty (&acp->free_list)) { + /* get the next entry */ + struct list_head *tmp = acp->free_list.next; + list_del (tmp); + acep = list_entry (tmp, auerchainelement_t, list); + kfree (acep); + } + return -ENOMEM; +} + + +/* completion handler for synchronous chained URBs */ +static void auerchain_blocking_completion (struct urb *urb, struct pt_regs *regs) +{ + pauerchain_chs_t pchs = (pauerchain_chs_t)urb->context; + pchs->done = 1; + wmb(); + wake_up (&pchs->wqh); +} + + +/* Starts chained urb and waits for completion or timeout */ +static int auerchain_start_wait_urb (pauerchain_t acp, struct urb *urb, int timeout, int* actual_length) +{ + auerchain_chs_t chs; + int status; + + dbg ("auerchain_start_wait_urb called"); + init_waitqueue_head (&chs.wqh); + chs.done = 0; + + urb->context = &chs; + status = auerchain_submit_urb (acp, urb); + if (status) + /* something went wrong */ + return status; + + timeout = wait_event_timeout(chs.wqh, chs.done, timeout); + + if (!timeout && !chs.done) { + if (urb->status != -EINPROGRESS) { /* No callback?!! */ + dbg ("auerchain_start_wait_urb: raced timeout"); + status = urb->status; + } else { + dbg ("auerchain_start_wait_urb: timeout"); + auerchain_unlink_urb (acp, urb); /* remove urb safely */ + status = -ETIMEDOUT; + } + } else + status = urb->status; + + if (actual_length) + *actual_length = urb->actual_length; + + return status; +} + + +/* auerchain_control_msg - Builds a control urb, sends it off and waits for completion + acp: pointer to the auerchain + dev: pointer to the usb device to send the message to + pipe: endpoint "pipe" to send the message to + request: USB message request value + requesttype: USB message request type value + value: USB message value + index: USB message index value + data: pointer to the data to send + size: length in bytes of the data to send + timeout: time to wait for the message to complete before timing out (if 0 the wait is forever) + + This function sends a simple control message to a specified endpoint + and waits for the message to complete, or timeout. + + If successful, it returns the transferred length, otherwise a negative error number. + + Don't use this function from within an interrupt context, like a + bottom half handler. If you need an asynchronous message, or need to send + a message from within interrupt context, use auerchain_submit_urb() +*/ +static int auerchain_control_msg (pauerchain_t acp, struct usb_device *dev, unsigned int pipe, __u8 request, __u8 requesttype, + __u16 value, __u16 index, void *data, __u16 size, int timeout) +{ + int ret; + struct usb_ctrlrequest *dr; + struct urb *urb; + int length; + + dbg ("auerchain_control_msg"); + dr = kmalloc (sizeof (struct usb_ctrlrequest), GFP_KERNEL); + if (!dr) + return -ENOMEM; + urb = usb_alloc_urb (0, GFP_KERNEL); + if (!urb) { + kfree (dr); + return -ENOMEM; + } + + dr->bRequestType = requesttype; + dr->bRequest = request; + dr->wValue = cpu_to_le16 (value); + dr->wIndex = cpu_to_le16 (index); + dr->wLength = cpu_to_le16 (size); + + usb_fill_control_urb (urb, dev, pipe, (unsigned char*)dr, data, size, /* build urb */ + auerchain_blocking_completion, NULL); + ret = auerchain_start_wait_urb (acp, urb, timeout, &length); + + usb_free_urb (urb); + kfree (dr); + + if (ret < 0) + return ret; + else + return length; +} + + +/*-------------------------------------------------------------------*/ +/* Buffer List helper functions */ + +/* free a single auerbuf */ +static void auerbuf_free (pauerbuf_t bp) +{ + if (bp->bufp) { + kfree (bp->bufp); + } + if (bp->dr) { + kfree (bp->dr); + } + if (bp->urbp) { + usb_free_urb (bp->urbp); + } + kfree (bp); +} + +/* free the buffers from an auerbuf list */ +static void auerbuf_free_list (struct list_head *q) +{ + struct list_head *tmp; + struct list_head *p; + pauerbuf_t bp; + + dbg ("auerbuf_free_list"); + for (p = q->next; p != q;) { + bp = list_entry (p, auerbuf_t, buff_list); + tmp = p->next; + list_del (p); + p = tmp; + auerbuf_free (bp); + } +} + +/* init the members of a list control block */ +static void auerbuf_init (pauerbufctl_t bcp) +{ + dbg ("auerbuf_init"); + spin_lock_init (&bcp->lock); + INIT_LIST_HEAD (&bcp->free_buff_list); + INIT_LIST_HEAD (&bcp->rec_buff_list); +} + +/* free all buffers from an auerbuf chain */ +static void auerbuf_free_buffers (pauerbufctl_t bcp) +{ + unsigned long flags; + dbg ("auerbuf_free_buffers"); + + spin_lock_irqsave (&bcp->lock, flags); + + auerbuf_free_list (&bcp->free_buff_list); + auerbuf_free_list (&bcp->rec_buff_list); + + spin_unlock_irqrestore (&bcp->lock, flags); +} + +/* setup a list of buffers */ +/* requirement: auerbuf_init() */ +static int auerbuf_setup (pauerbufctl_t bcp, unsigned int numElements, unsigned int bufsize) +{ + pauerbuf_t bep = NULL; + + dbg ("auerbuf_setup called with %d elements of %d bytes", numElements, bufsize); + + /* fill the list of free elements */ + for (;numElements; numElements--) { + bep = (pauerbuf_t) kmalloc (sizeof (auerbuf_t), GFP_KERNEL); + if (!bep) + goto bl_fail; + memset (bep, 0, sizeof (auerbuf_t)); + bep->list = bcp; + INIT_LIST_HEAD (&bep->buff_list); + bep->bufp = (char *) kmalloc (bufsize, GFP_KERNEL); + if (!bep->bufp) + goto bl_fail; + bep->dr = (struct usb_ctrlrequest *) kmalloc (sizeof (struct usb_ctrlrequest), GFP_KERNEL); + if (!bep->dr) + goto bl_fail; + bep->urbp = usb_alloc_urb (0, GFP_KERNEL); + if (!bep->urbp) + goto bl_fail; + list_add_tail (&bep->buff_list, &bcp->free_buff_list); + } + return 0; + +bl_fail:/* not enough memory. Free allocated elements */ + dbg ("auerbuf_setup: no more memory"); + kfree(bep); + auerbuf_free_buffers (bcp); + return -ENOMEM; +} + +/* insert a used buffer into the free list */ +static void auerbuf_releasebuf( pauerbuf_t bp) +{ + unsigned long flags; + pauerbufctl_t bcp = bp->list; + bp->retries = 0; + + dbg ("auerbuf_releasebuf called"); + spin_lock_irqsave (&bcp->lock, flags); + list_add_tail (&bp->buff_list, &bcp->free_buff_list); + spin_unlock_irqrestore (&bcp->lock, flags); +} + + +/*-------------------------------------------------------------------*/ +/* Completion handlers */ + +/* Values of urb->status or results of usb_submit_urb(): +0 Initial, OK +-EINPROGRESS during submission until end +-ENOENT if urb is unlinked +-ETIMEDOUT Transfer timed out, NAK +-ENOMEM Memory Overflow +-ENODEV Specified USB-device or bus doesn't exist +-ENXIO URB already queued +-EINVAL a) Invalid transfer type specified (or not supported) + b) Invalid interrupt interval (0n256) +-EAGAIN a) Specified ISO start frame too early + b) (using ISO-ASAP) Too much scheduled for the future wait some time and try again. +-EFBIG Too much ISO frames requested (currently uhci900) +-EPIPE Specified pipe-handle/Endpoint is already stalled +-EMSGSIZE Endpoint message size is zero, do interface/alternate setting +-EPROTO a) Bitstuff error + b) Unknown USB error +-EILSEQ CRC mismatch +-ENOSR Buffer error +-EREMOTEIO Short packet detected +-EXDEV ISO transfer only partially completed look at individual frame status for details +-EINVAL ISO madness, if this happens: Log off and go home +-EOVERFLOW babble +*/ + +/* check if a status code allows a retry */ +static int auerswald_status_retry (int status) +{ + switch (status) { + case 0: + case -ETIMEDOUT: + case -EOVERFLOW: + case -EAGAIN: + case -EPIPE: + case -EPROTO: + case -EILSEQ: + case -ENOSR: + case -EREMOTEIO: + return 1; /* do a retry */ + } + return 0; /* no retry possible */ +} + +/* Completion of asynchronous write block */ +static void auerchar_ctrlwrite_complete (struct urb * urb, struct pt_regs *regs) +{ + pauerbuf_t bp = (pauerbuf_t) urb->context; + pauerswald_t cp = ((pauerswald_t)((char *)(bp->list)-(unsigned long)(&((pauerswald_t)0)->bufctl))); + dbg ("auerchar_ctrlwrite_complete called"); + + /* reuse the buffer */ + auerbuf_releasebuf (bp); + /* Wake up all processes waiting for a buffer */ + wake_up (&cp->bufferwait); +} + +/* Completion handler for dummy retry packet */ +static void auerswald_ctrlread_wretcomplete (struct urb * urb, struct pt_regs *regs) +{ + pauerbuf_t bp = (pauerbuf_t) urb->context; + pauerswald_t cp; + int ret; + dbg ("auerswald_ctrlread_wretcomplete called"); + dbg ("complete with status: %d", urb->status); + cp = ((pauerswald_t)((char *)(bp->list)-(unsigned long)(&((pauerswald_t)0)->bufctl))); + + /* check if it is possible to advance */ + if (!auerswald_status_retry (urb->status) || !cp->usbdev) { + /* reuse the buffer */ + err ("control dummy: transmission error %d, can not retry", urb->status); + auerbuf_releasebuf (bp); + /* Wake up all processes waiting for a buffer */ + wake_up (&cp->bufferwait); + return; + } + + /* fill the control message */ + bp->dr->bRequestType = AUT_RREQ; + bp->dr->bRequest = AUV_RBLOCK; + bp->dr->wLength = bp->dr->wValue; /* temporary stored */ + bp->dr->wValue = cpu_to_le16 (1); /* Retry Flag */ + /* bp->dr->index = channel id; remains */ + usb_fill_control_urb (bp->urbp, cp->usbdev, usb_rcvctrlpipe (cp->usbdev, 0), + (unsigned char*)bp->dr, bp->bufp, le16_to_cpu (bp->dr->wLength), + auerswald_ctrlread_complete,bp); + + /* submit the control msg as next paket */ + ret = auerchain_submit_urb_list (&cp->controlchain, bp->urbp, 1); + if (ret) { + dbg ("auerswald_ctrlread_complete: nonzero result of auerchain_submit_urb_list %d", ret); + bp->urbp->status = ret; + auerswald_ctrlread_complete (bp->urbp, NULL); + } +} + +/* completion handler for receiving of control messages */ +static void auerswald_ctrlread_complete (struct urb * urb, struct pt_regs *regs) +{ + unsigned int serviceid; + pauerswald_t cp; + pauerscon_t scp; + pauerbuf_t bp = (pauerbuf_t) urb->context; + int ret; + dbg ("auerswald_ctrlread_complete called"); + + cp = ((pauerswald_t)((char *)(bp->list)-(unsigned long)(&((pauerswald_t)0)->bufctl))); + + /* check if there is valid data in this urb */ + if (urb->status) { + dbg ("complete with non-zero status: %d", urb->status); + /* should we do a retry? */ + if (!auerswald_status_retry (urb->status) + || !cp->usbdev + || (cp->version < AUV_RETRY) + || (bp->retries >= AU_RETRIES)) { + /* reuse the buffer */ + err ("control read: transmission error %d, can not retry", urb->status); + auerbuf_releasebuf (bp); + /* Wake up all processes waiting for a buffer */ + wake_up (&cp->bufferwait); + return; + } + bp->retries++; + dbg ("Retry count = %d", bp->retries); + /* send a long dummy control-write-message to allow device firmware to react */ + bp->dr->bRequestType = AUT_WREQ; + bp->dr->bRequest = AUV_DUMMY; + bp->dr->wValue = bp->dr->wLength; /* temporary storage */ + // bp->dr->wIndex channel ID remains + bp->dr->wLength = cpu_to_le16 (32); /* >= 8 bytes */ + usb_fill_control_urb (bp->urbp, cp->usbdev, usb_sndctrlpipe (cp->usbdev, 0), + (unsigned char*)bp->dr, bp->bufp, 32, + auerswald_ctrlread_wretcomplete,bp); + + /* submit the control msg as next paket */ + ret = auerchain_submit_urb_list (&cp->controlchain, bp->urbp, 1); + if (ret) { + dbg ("auerswald_ctrlread_complete: nonzero result of auerchain_submit_urb_list %d", ret); + bp->urbp->status = ret; + auerswald_ctrlread_wretcomplete (bp->urbp, regs); + } + return; + } + + /* get the actual bytecount (incl. headerbyte) */ + bp->len = urb->actual_length; + serviceid = bp->bufp[0] & AUH_TYPEMASK; + dbg ("Paket with serviceid %d and %d bytes received", serviceid, bp->len); + + /* dispatch the paket */ + scp = cp->services[serviceid]; + if (scp) { + /* look, Ma, a listener! */ + scp->dispatch (scp, bp); + } + + /* release the paket */ + auerbuf_releasebuf (bp); + /* Wake up all processes waiting for a buffer */ + wake_up (&cp->bufferwait); +} + +/*-------------------------------------------------------------------*/ +/* Handling of Interrupt Endpoint */ +/* This interrupt Endpoint is used to inform the host about waiting + messages from the USB device. +*/ +/* int completion handler. */ +static void auerswald_int_complete (struct urb * urb, struct pt_regs *regs) +{ + unsigned long flags; + unsigned int channelid; + unsigned int bytecount; + int ret; + pauerbuf_t bp = NULL; + pauerswald_t cp = (pauerswald_t) urb->context; + + dbg ("%s called", __FUNCTION__); + + switch (urb->status) { + case 0: + /* success */ + break; + case -ECONNRESET: + case -ENOENT: + case -ESHUTDOWN: + /* this urb is terminated, clean up */ + dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status); + return; + default: + dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status); + goto exit; + } + + /* check if all needed data was received */ + if (urb->actual_length < AU_IRQMINSIZE) { + dbg ("invalid data length received: %d bytes", urb->actual_length); + goto exit; + } + + /* check the command code */ + if (cp->intbufp[0] != AU_IRQCMDID) { + dbg ("invalid command received: %d", cp->intbufp[0]); + goto exit; + } + + /* check the command type */ + if (cp->intbufp[1] != AU_BLOCKRDY) { + dbg ("invalid command type received: %d", cp->intbufp[1]); + goto exit; + } + + /* now extract the information */ + channelid = cp->intbufp[2]; + bytecount = (unsigned char)cp->intbufp[3]; + bytecount |= (unsigned char)cp->intbufp[4] << 8; + + /* check the channel id */ + if (channelid >= AUH_TYPESIZE) { + dbg ("invalid channel id received: %d", channelid); + goto exit; + } + + /* check the byte count */ + if (bytecount > (cp->maxControlLength+AUH_SIZE)) { + dbg ("invalid byte count received: %d", bytecount); + goto exit; + } + dbg ("Service Channel = %d", channelid); + dbg ("Byte Count = %d", bytecount); + + /* get a buffer for the next data paket */ + spin_lock_irqsave (&cp->bufctl.lock, flags); + if (!list_empty (&cp->bufctl.free_buff_list)) { + /* yes: get the entry */ + struct list_head *tmp = cp->bufctl.free_buff_list.next; + list_del (tmp); + bp = list_entry (tmp, auerbuf_t, buff_list); + } + spin_unlock_irqrestore (&cp->bufctl.lock, flags); + + /* if no buffer available: skip it */ + if (!bp) { + dbg ("auerswald_int_complete: no data buffer available"); + /* can we do something more? + This is a big problem: if this int packet is ignored, the + device will wait forever and not signal any more data. + The only real solution is: having enough buffers! + Or perhaps temporary disabling the int endpoint? + */ + goto exit; + } + + /* fill the control message */ + bp->dr->bRequestType = AUT_RREQ; + bp->dr->bRequest = AUV_RBLOCK; + bp->dr->wValue = cpu_to_le16 (0); + bp->dr->wIndex = cpu_to_le16 (channelid | AUH_DIRECT | AUH_UNSPLIT); + bp->dr->wLength = cpu_to_le16 (bytecount); + usb_fill_control_urb (bp->urbp, cp->usbdev, usb_rcvctrlpipe (cp->usbdev, 0), + (unsigned char*)bp->dr, bp->bufp, bytecount, + auerswald_ctrlread_complete,bp); + + /* submit the control msg */ + ret = auerchain_submit_urb (&cp->controlchain, bp->urbp); + if (ret) { + dbg ("auerswald_int_complete: nonzero result of auerchain_submit_urb %d", ret); + bp->urbp->status = ret; + auerswald_ctrlread_complete( bp->urbp, NULL); + /* here applies the same problem as above: device locking! */ + } +exit: + ret = usb_submit_urb (urb, GFP_ATOMIC); + if (ret) + err ("%s - usb_submit_urb failed with result %d", + __FUNCTION__, ret); +} + +/* int memory deallocation + NOTE: no mutex please! +*/ +static void auerswald_int_free (pauerswald_t cp) +{ + if (cp->inturbp) { + usb_free_urb (cp->inturbp); + cp->inturbp = NULL; + } + if (cp->intbufp) { + kfree (cp->intbufp); + cp->intbufp = NULL; + } +} + +/* This function is called to activate the interrupt + endpoint. This function returns 0 if successful or an error code. + NOTE: no mutex please! +*/ +static int auerswald_int_open (pauerswald_t cp) +{ + int ret; + struct usb_host_endpoint *ep; + int irqsize; + dbg ("auerswald_int_open"); + + ep = cp->usbdev->ep_in[AU_IRQENDP]; + if (!ep) { + ret = -EFAULT; + goto intoend; + } + irqsize = le16_to_cpu(ep->desc.wMaxPacketSize); + cp->irqsize = irqsize; + + /* allocate the urb and data buffer */ + if (!cp->inturbp) { + cp->inturbp = usb_alloc_urb (0, GFP_KERNEL); + if (!cp->inturbp) { + ret = -ENOMEM; + goto intoend; + } + } + if (!cp->intbufp) { + cp->intbufp = (char *) kmalloc (irqsize, GFP_KERNEL); + if (!cp->intbufp) { + ret = -ENOMEM; + goto intoend; + } + } + /* setup urb */ + usb_fill_int_urb (cp->inturbp, cp->usbdev, + usb_rcvintpipe (cp->usbdev,AU_IRQENDP), cp->intbufp, + irqsize, auerswald_int_complete, cp, ep->desc.bInterval); + /* start the urb */ + cp->inturbp->status = 0; /* needed! */ + ret = usb_submit_urb (cp->inturbp, GFP_KERNEL); + +intoend: + if (ret < 0) { + /* activation of interrupt endpoint has failed. Now clean up. */ + dbg ("auerswald_int_open: activation of int endpoint failed"); + + /* deallocate memory */ + auerswald_int_free (cp); + } + return ret; +} + +/* This function is called to deactivate the interrupt + endpoint. This function returns 0 if successful or an error code. + NOTE: no mutex please! +*/ +static void auerswald_int_release (pauerswald_t cp) +{ + dbg ("auerswald_int_release"); + + /* stop the int endpoint */ + if (cp->inturbp) + usb_kill_urb (cp->inturbp); + + /* deallocate memory */ + auerswald_int_free (cp); +} + +/* --------------------------------------------------------------------- */ +/* Helper functions */ + +/* wake up waiting readers */ +static void auerchar_disconnect (pauerscon_t scp) +{ + pauerchar_t ccp = ((pauerchar_t)((char *)(scp)-(unsigned long)(&((pauerchar_t)0)->scontext))); + dbg ("auerchar_disconnect called"); + ccp->removed = 1; + wake_up (&ccp->readwait); +} + + +/* dispatch a read paket to a waiting character device */ +static void auerchar_ctrlread_dispatch (pauerscon_t scp, pauerbuf_t bp) +{ + unsigned long flags; + pauerchar_t ccp; + pauerbuf_t newbp = NULL; + char * charp; + dbg ("auerchar_ctrlread_dispatch called"); + ccp = ((pauerchar_t)((char *)(scp)-(unsigned long)(&((pauerchar_t)0)->scontext))); + + /* get a read buffer from character device context */ + spin_lock_irqsave (&ccp->bufctl.lock, flags); + if (!list_empty (&ccp->bufctl.free_buff_list)) { + /* yes: get the entry */ + struct list_head *tmp = ccp->bufctl.free_buff_list.next; + list_del (tmp); + newbp = list_entry (tmp, auerbuf_t, buff_list); + } + spin_unlock_irqrestore (&ccp->bufctl.lock, flags); + + if (!newbp) { + dbg ("No read buffer available, discard paket!"); + return; /* no buffer, no dispatch */ + } + + /* copy information to new buffer element + (all buffers have the same length) */ + charp = newbp->bufp; + newbp->bufp = bp->bufp; + bp->bufp = charp; + newbp->len = bp->len; + + /* insert new buffer in read list */ + spin_lock_irqsave (&ccp->bufctl.lock, flags); + list_add_tail (&newbp->buff_list, &ccp->bufctl.rec_buff_list); + spin_unlock_irqrestore (&ccp->bufctl.lock, flags); + dbg ("read buffer appended to rec_list"); + + /* wake up pending synchronous reads */ + wake_up (&ccp->readwait); +} + + +/* Delete an auerswald driver context */ +static void auerswald_delete( pauerswald_t cp) +{ + dbg( "auerswald_delete"); + if (cp == NULL) + return; + + /* Wake up all processes waiting for a buffer */ + wake_up (&cp->bufferwait); + + /* Cleaning up */ + auerswald_int_release (cp); + auerchain_free (&cp->controlchain); + auerbuf_free_buffers (&cp->bufctl); + + /* release the memory */ + kfree( cp); +} + + +/* Delete an auerswald character context */ +static void auerchar_delete( pauerchar_t ccp) +{ + dbg ("auerchar_delete"); + if (ccp == NULL) + return; + + /* wake up pending synchronous reads */ + ccp->removed = 1; + wake_up (&ccp->readwait); + + /* remove the read buffer */ + if (ccp->readbuf) { + auerbuf_releasebuf (ccp->readbuf); + ccp->readbuf = NULL; + } + + /* remove the character buffers */ + auerbuf_free_buffers (&ccp->bufctl); + + /* release the memory */ + kfree( ccp); +} + + +/* add a new service to the device + scp->id must be set! + return: 0 if OK, else error code +*/ +static int auerswald_addservice (pauerswald_t cp, pauerscon_t scp) +{ + int ret; + + /* is the device available? */ + if (!cp->usbdev) { + dbg ("usbdev == NULL"); + return -EIO; /*no: can not add a service, sorry*/ + } + + /* is the service available? */ + if (cp->services[scp->id]) { + dbg ("service is busy"); + return -EBUSY; + } + + /* device is available, service is free */ + cp->services[scp->id] = scp; + + /* register service in device */ + ret = auerchain_control_msg( + &cp->controlchain, /* pointer to control chain */ + cp->usbdev, /* pointer to device */ + usb_sndctrlpipe (cp->usbdev, 0), /* pipe to control endpoint */ + AUV_CHANNELCTL, /* USB message request value */ + AUT_WREQ, /* USB message request type value */ + 0x01, /* open USB message value */ + scp->id, /* USB message index value */ + NULL, /* pointer to the data to send */ + 0, /* length in bytes of the data to send */ + HZ * 2); /* time to wait for the message to complete before timing out */ + if (ret < 0) { + dbg ("auerswald_addservice: auerchain_control_msg returned error code %d", ret); + /* undo above actions */ + cp->services[scp->id] = NULL; + return ret; + } + + dbg ("auerswald_addservice: channel open OK"); + return 0; +} + + +/* remove a service from the the device + scp->id must be set! */ +static void auerswald_removeservice (pauerswald_t cp, pauerscon_t scp) +{ + dbg ("auerswald_removeservice called"); + + /* check if we have a service allocated */ + if (scp->id == AUH_UNASSIGNED) + return; + + /* If there is a device: close the channel */ + if (cp->usbdev) { + /* Close the service channel inside the device */ + int ret = auerchain_control_msg( + &cp->controlchain, /* pointer to control chain */ + cp->usbdev, /* pointer to device */ + usb_sndctrlpipe (cp->usbdev, 0), /* pipe to control endpoint */ + AUV_CHANNELCTL, /* USB message request value */ + AUT_WREQ, /* USB message request type value */ + 0x00, // close /* USB message value */ + scp->id, /* USB message index value */ + NULL, /* pointer to the data to send */ + 0, /* length in bytes of the data to send */ + HZ * 2); /* time to wait for the message to complete before timing out */ + if (ret < 0) { + dbg ("auerswald_removeservice: auerchain_control_msg returned error code %d", ret); + } + else { + dbg ("auerswald_removeservice: channel close OK"); + } + } + + /* remove the service from the device */ + cp->services[scp->id] = NULL; + scp->id = AUH_UNASSIGNED; +} + + +/* --------------------------------------------------------------------- */ +/* Char device functions */ + +/* Open a new character device */ +static int auerchar_open (struct inode *inode, struct file *file) +{ + int dtindex = iminor(inode); + pauerswald_t cp = NULL; + pauerchar_t ccp = NULL; + struct usb_interface *intf; + int ret; + + /* minor number in range? */ + if (dtindex < 0) { + return -ENODEV; + } + intf = usb_find_interface(&auerswald_driver, dtindex); + if (!intf) { + return -ENODEV; + } + + /* usb device available? */ + cp = usb_get_intfdata (intf); + if (cp == NULL) { + return -ENODEV; + } + if (down_interruptible (&cp->mutex)) { + return -ERESTARTSYS; + } + + /* we have access to the device. Now lets allocate memory */ + ccp = (pauerchar_t) kmalloc(sizeof(auerchar_t), GFP_KERNEL); + if (ccp == NULL) { + err ("out of memory"); + ret = -ENOMEM; + goto ofail; + } + + /* Initialize device descriptor */ + memset( ccp, 0, sizeof(auerchar_t)); + init_MUTEX( &ccp->mutex); + init_MUTEX( &ccp->readmutex); + auerbuf_init (&ccp->bufctl); + ccp->scontext.id = AUH_UNASSIGNED; + ccp->scontext.dispatch = auerchar_ctrlread_dispatch; + ccp->scontext.disconnect = auerchar_disconnect; + init_waitqueue_head (&ccp->readwait); + + ret = auerbuf_setup (&ccp->bufctl, AU_RBUFFERS, cp->maxControlLength+AUH_SIZE); + if (ret) { + goto ofail; + } + + cp->open_count++; + ccp->auerdev = cp; + dbg("open %s as /dev/%s", cp->dev_desc, cp->name); + up (&cp->mutex); + + /* file IO stuff */ + file->f_pos = 0; + file->private_data = ccp; + return nonseekable_open(inode, file); + + /* Error exit */ +ofail: up (&cp->mutex); + auerchar_delete (ccp); + return ret; +} + + +/* IOCTL functions */ +static int auerchar_ioctl (struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) +{ + pauerchar_t ccp = (pauerchar_t) file->private_data; + int ret = 0; + audevinfo_t devinfo; + pauerswald_t cp = NULL; + unsigned int u; + unsigned int __user *user_arg = (unsigned int __user *)arg; + + dbg ("ioctl"); + + /* get the mutexes */ + if (down_interruptible (&ccp->mutex)) { + return -ERESTARTSYS; + } + cp = ccp->auerdev; + if (!cp) { + up (&ccp->mutex); + return -ENODEV; + } + if (down_interruptible (&cp->mutex)) { + up(&ccp->mutex); + return -ERESTARTSYS; + } + + /* Check for removal */ + if (!cp->usbdev) { + up(&cp->mutex); + up(&ccp->mutex); + return -ENODEV; + } + + switch (cmd) { + + /* return != 0 if Transmitt channel ready to send */ + case IOCTL_AU_TXREADY: + dbg ("IOCTL_AU_TXREADY"); + u = ccp->auerdev + && (ccp->scontext.id != AUH_UNASSIGNED) + && !list_empty (&cp->bufctl.free_buff_list); + ret = put_user (u, user_arg); + break; + + /* return != 0 if connected to a service channel */ + case IOCTL_AU_CONNECT: + dbg ("IOCTL_AU_CONNECT"); + u = (ccp->scontext.id != AUH_UNASSIGNED); + ret = put_user (u, user_arg); + break; + + /* return != 0 if Receive Data available */ + case IOCTL_AU_RXAVAIL: + dbg ("IOCTL_AU_RXAVAIL"); + if (ccp->scontext.id == AUH_UNASSIGNED) { + ret = -EIO; + break; + } + u = 0; /* no data */ + if (ccp->readbuf) { + int restlen = ccp->readbuf->len - ccp->readoffset; + if (restlen > 0) + u = 1; + } + if (!u) { + if (!list_empty (&ccp->bufctl.rec_buff_list)) { + u = 1; + } + } + ret = put_user (u, user_arg); + break; + + /* return the max. buffer length for the device */ + case IOCTL_AU_BUFLEN: + dbg ("IOCTL_AU_BUFLEN"); + u = cp->maxControlLength; + ret = put_user (u, user_arg); + break; + + /* requesting a service channel */ + case IOCTL_AU_SERVREQ: + dbg ("IOCTL_AU_SERVREQ"); + /* requesting a service means: release the previous one first */ + auerswald_removeservice (cp, &ccp->scontext); + /* get the channel number */ + ret = get_user (u, user_arg); + if (ret) { + break; + } + if ((u < AUH_FIRSTUSERCH) || (u >= AUH_TYPESIZE)) { + ret = -EIO; + break; + } + dbg ("auerchar service request parameters are ok"); + ccp->scontext.id = u; + + /* request the service now */ + ret = auerswald_addservice (cp, &ccp->scontext); + if (ret) { + /* no: revert service entry */ + ccp->scontext.id = AUH_UNASSIGNED; + } + break; + + /* get a string descriptor for the device */ + case IOCTL_AU_DEVINFO: + dbg ("IOCTL_AU_DEVINFO"); + if (copy_from_user (&devinfo, (void __user *) arg, sizeof (audevinfo_t))) { + ret = -EFAULT; + break; + } + u = strlen(cp->dev_desc)+1; + if (u > devinfo.bsize) { + u = devinfo.bsize; + } + ret = copy_to_user(devinfo.buf, cp->dev_desc, u) ? -EFAULT : 0; + break; + + /* get the max. string descriptor length */ + case IOCTL_AU_SLEN: + dbg ("IOCTL_AU_SLEN"); + u = AUSI_DLEN; + ret = put_user (u, user_arg); + break; + + default: + dbg ("IOCTL_AU_UNKNOWN"); + ret = -ENOIOCTLCMD; + break; + } + /* release the mutexes */ + up(&cp->mutex); + up(&ccp->mutex); + return ret; +} + +/* Read data from the device */ +static ssize_t auerchar_read (struct file *file, char __user *buf, size_t count, loff_t * ppos) +{ + unsigned long flags; + pauerchar_t ccp = (pauerchar_t) file->private_data; + pauerbuf_t bp = NULL; + wait_queue_t wait; + + dbg ("auerchar_read"); + + /* Error checking */ + if (!ccp) + return -EIO; + if (*ppos) + return -ESPIPE; + if (count == 0) + return 0; + + /* get the mutex */ + if (down_interruptible (&ccp->mutex)) + return -ERESTARTSYS; + + /* Can we expect to read something? */ + if (ccp->scontext.id == AUH_UNASSIGNED) { + up (&ccp->mutex); + return -EIO; + } + + /* only one reader per device allowed */ + if (down_interruptible (&ccp->readmutex)) { + up (&ccp->mutex); + return -ERESTARTSYS; + } + + /* read data from readbuf, if available */ +doreadbuf: + bp = ccp->readbuf; + if (bp) { + /* read the maximum bytes */ + int restlen = bp->len - ccp->readoffset; + if (restlen < 0) + restlen = 0; + if (count > restlen) + count = restlen; + if (count) { + if (copy_to_user (buf, bp->bufp+ccp->readoffset, count)) { + dbg ("auerswald_read: copy_to_user failed"); + up (&ccp->readmutex); + up (&ccp->mutex); + return -EFAULT; + } + } + /* advance the read offset */ + ccp->readoffset += count; + restlen -= count; + // reuse the read buffer + if (restlen <= 0) { + auerbuf_releasebuf (bp); + ccp->readbuf = NULL; + } + /* return with number of bytes read */ + if (count) { + up (&ccp->readmutex); + up (&ccp->mutex); + return count; + } + } + + /* a read buffer is not available. Try to get the next data block. */ +doreadlist: + /* Preparing for sleep */ + init_waitqueue_entry (&wait, current); + set_current_state (TASK_INTERRUPTIBLE); + add_wait_queue (&ccp->readwait, &wait); + + bp = NULL; + spin_lock_irqsave (&ccp->bufctl.lock, flags); + if (!list_empty (&ccp->bufctl.rec_buff_list)) { + /* yes: get the entry */ + struct list_head *tmp = ccp->bufctl.rec_buff_list.next; + list_del (tmp); + bp = list_entry (tmp, auerbuf_t, buff_list); + } + spin_unlock_irqrestore (&ccp->bufctl.lock, flags); + + /* have we got data? */ + if (bp) { + ccp->readbuf = bp; + ccp->readoffset = AUH_SIZE; /* for headerbyte */ + set_current_state (TASK_RUNNING); + remove_wait_queue (&ccp->readwait, &wait); + goto doreadbuf; /* now we can read! */ + } + + /* no data available. Should we wait? */ + if (file->f_flags & O_NONBLOCK) { + dbg ("No read buffer available, returning -EAGAIN"); + set_current_state (TASK_RUNNING); + remove_wait_queue (&ccp->readwait, &wait); + up (&ccp->readmutex); + up (&ccp->mutex); + return -EAGAIN; /* nonblocking, no data available */ + } + + /* yes, we should wait! */ + up (&ccp->mutex); /* allow other operations while we wait */ + schedule(); + remove_wait_queue (&ccp->readwait, &wait); + if (signal_pending (current)) { + /* waked up by a signal */ + up (&ccp->readmutex); + return -ERESTARTSYS; + } + + /* Anything left to read? */ + if ((ccp->scontext.id == AUH_UNASSIGNED) || ccp->removed) { + up (&ccp->readmutex); + return -EIO; + } + + if (down_interruptible (&ccp->mutex)) { + up (&ccp->readmutex); + return -ERESTARTSYS; + } + + /* try to read the incoming data again */ + goto doreadlist; +} + + +/* Write a data block into the right service channel of the device */ +static ssize_t auerchar_write (struct file *file, const char __user *buf, size_t len, loff_t *ppos) +{ + pauerchar_t ccp = (pauerchar_t) file->private_data; + pauerswald_t cp = NULL; + pauerbuf_t bp; + unsigned long flags; + int ret; + wait_queue_t wait; + + dbg ("auerchar_write %d bytes", len); + + /* Error checking */ + if (!ccp) + return -EIO; + if (*ppos) + return -ESPIPE; + if (len == 0) + return 0; + +write_again: + /* get the mutex */ + if (down_interruptible (&ccp->mutex)) + return -ERESTARTSYS; + + /* Can we expect to write something? */ + if (ccp->scontext.id == AUH_UNASSIGNED) { + up (&ccp->mutex); + return -EIO; + } + + cp = ccp->auerdev; + if (!cp) { + up (&ccp->mutex); + return -ERESTARTSYS; + } + if (down_interruptible (&cp->mutex)) { + up (&ccp->mutex); + return -ERESTARTSYS; + } + if (!cp->usbdev) { + up (&cp->mutex); + up (&ccp->mutex); + return -EIO; + } + /* Prepare for sleep */ + init_waitqueue_entry (&wait, current); + set_current_state (TASK_INTERRUPTIBLE); + add_wait_queue (&cp->bufferwait, &wait); + + /* Try to get a buffer from the device pool. + We can't use a buffer from ccp->bufctl because the write + command will last beond a release() */ + bp = NULL; + spin_lock_irqsave (&cp->bufctl.lock, flags); + if (!list_empty (&cp->bufctl.free_buff_list)) { + /* yes: get the entry */ + struct list_head *tmp = cp->bufctl.free_buff_list.next; + list_del (tmp); + bp = list_entry (tmp, auerbuf_t, buff_list); + } + spin_unlock_irqrestore (&cp->bufctl.lock, flags); + + /* are there any buffers left? */ + if (!bp) { + up (&cp->mutex); + up (&ccp->mutex); + + /* NONBLOCK: don't wait */ + if (file->f_flags & O_NONBLOCK) { + set_current_state (TASK_RUNNING); + remove_wait_queue (&cp->bufferwait, &wait); + return -EAGAIN; + } + + /* BLOCKING: wait */ + schedule(); + remove_wait_queue (&cp->bufferwait, &wait); + if (signal_pending (current)) { + /* waked up by a signal */ + return -ERESTARTSYS; + } + goto write_again; + } else { + set_current_state (TASK_RUNNING); + remove_wait_queue (&cp->bufferwait, &wait); + } + + /* protect against too big write requests */ + if (len > cp->maxControlLength) + len = cp->maxControlLength; + + /* Fill the buffer */ + if (copy_from_user ( bp->bufp+AUH_SIZE, buf, len)) { + dbg ("copy_from_user failed"); + auerbuf_releasebuf (bp); + /* Wake up all processes waiting for a buffer */ + wake_up (&cp->bufferwait); + up (&cp->mutex); + up (&ccp->mutex); + return -EFAULT; + } + + /* set the header byte */ + *(bp->bufp) = ccp->scontext.id | AUH_DIRECT | AUH_UNSPLIT; + + /* Set the transfer Parameters */ + bp->len = len+AUH_SIZE; + bp->dr->bRequestType = AUT_WREQ; + bp->dr->bRequest = AUV_WBLOCK; + bp->dr->wValue = cpu_to_le16 (0); + bp->dr->wIndex = cpu_to_le16 (ccp->scontext.id | AUH_DIRECT | AUH_UNSPLIT); + bp->dr->wLength = cpu_to_le16 (len+AUH_SIZE); + usb_fill_control_urb (bp->urbp, cp->usbdev, usb_sndctrlpipe (cp->usbdev, 0), + (unsigned char*)bp->dr, bp->bufp, len+AUH_SIZE, + auerchar_ctrlwrite_complete, bp); + /* up we go */ + ret = auerchain_submit_urb (&cp->controlchain, bp->urbp); + up (&cp->mutex); + if (ret) { + dbg ("auerchar_write: nonzero result of auerchain_submit_urb %d", ret); + auerbuf_releasebuf (bp); + /* Wake up all processes waiting for a buffer */ + wake_up (&cp->bufferwait); + up (&ccp->mutex); + return -EIO; + } + else { + dbg ("auerchar_write: Write OK"); + up (&ccp->mutex); + return len; + } +} + + +/* Close a character device */ +static int auerchar_release (struct inode *inode, struct file *file) +{ + pauerchar_t ccp = (pauerchar_t) file->private_data; + pauerswald_t cp; + dbg("release"); + + /* get the mutexes */ + if (down_interruptible (&ccp->mutex)) { + return -ERESTARTSYS; + } + cp = ccp->auerdev; + if (cp) { + if (down_interruptible (&cp->mutex)) { + up (&ccp->mutex); + return -ERESTARTSYS; + } + /* remove an open service */ + auerswald_removeservice (cp, &ccp->scontext); + /* detach from device */ + if ((--cp->open_count <= 0) && (cp->usbdev == NULL)) { + /* usb device waits for removal */ + up (&cp->mutex); + auerswald_delete (cp); + } else { + up (&cp->mutex); + } + cp = NULL; + ccp->auerdev = NULL; + } + up (&ccp->mutex); + auerchar_delete (ccp); + + return 0; +} + + +/*----------------------------------------------------------------------*/ +/* File operation structure */ +static struct file_operations auerswald_fops = +{ + .owner = THIS_MODULE, + .llseek = no_llseek, + .read = auerchar_read, + .write = auerchar_write, + .ioctl = auerchar_ioctl, + .open = auerchar_open, + .release = auerchar_release, +}; + +static struct usb_class_driver auerswald_class = { + .name = "usb/auer%d", + .fops = &auerswald_fops, + .mode = S_IFCHR | S_IRUGO | S_IWUGO, + .minor_base = AUER_MINOR_BASE, +}; + + +/* --------------------------------------------------------------------- */ +/* Special USB driver functions */ + +/* Probe if this driver wants to serve an USB device + + This entry point is called whenever a new device is attached to the bus. + Then the device driver has to create a new instance of its internal data + structures for the new device. + + The dev argument specifies the device context, which contains pointers + to all USB descriptors. The interface argument specifies the interface + number. If a USB driver wants to bind itself to a particular device and + interface it has to return a pointer. This pointer normally references + the device driver's context structure. + + Probing normally is done by checking the vendor and product identifications + or the class and subclass definitions. If they match the interface number + is compared with the ones supported by the driver. When probing is done + class based it might be necessary to parse some more USB descriptors because + the device properties can differ in a wide range. +*/ +static int auerswald_probe (struct usb_interface *intf, + const struct usb_device_id *id) +{ + struct usb_device *usbdev = interface_to_usbdev(intf); + pauerswald_t cp = NULL; + unsigned int u = 0; + __le16 *pbuf; + int ret; + + dbg ("probe: vendor id 0x%x, device id 0x%x", + le16_to_cpu(usbdev->descriptor.idVendor), + le16_to_cpu(usbdev->descriptor.idProduct)); + + /* we use only the first -and only- interface */ + if (intf->altsetting->desc.bInterfaceNumber != 0) + return -ENODEV; + + /* allocate memory for our device and initialize it */ + cp = kmalloc (sizeof(auerswald_t), GFP_KERNEL); + if (cp == NULL) { + err ("out of memory"); + goto pfail; + } + + /* Initialize device descriptor */ + memset (cp, 0, sizeof(auerswald_t)); + init_MUTEX (&cp->mutex); + cp->usbdev = usbdev; + auerchain_init (&cp->controlchain); + auerbuf_init (&cp->bufctl); + init_waitqueue_head (&cp->bufferwait); + + ret = usb_register_dev(intf, &auerswald_class); + if (ret) { + err ("Not able to get a minor for this device."); + goto pfail; + } + + /* Give the device a name */ + sprintf (cp->name, "usb/auer%d", intf->minor); + + /* Store the index */ + cp->dtindex = intf->minor; + + /* Get the usb version of the device */ + cp->version = le16_to_cpu(cp->usbdev->descriptor.bcdDevice); + dbg ("Version is %X", cp->version); + + /* allow some time to settle the device */ + msleep(334); + + /* Try to get a suitable textual description of the device */ + /* Device name:*/ + ret = usb_string( cp->usbdev, AUSI_DEVICE, cp->dev_desc, AUSI_DLEN-1); + if (ret >= 0) { + u += ret; + /* Append Serial Number */ + memcpy(&cp->dev_desc[u], ",Ser# ", 6); + u += 6; + ret = usb_string( cp->usbdev, AUSI_SERIALNR, &cp->dev_desc[u], AUSI_DLEN-u-1); + if (ret >= 0) { + u += ret; + /* Append subscriber number */ + memcpy(&cp->dev_desc[u], ", ", 2); + u += 2; + ret = usb_string( cp->usbdev, AUSI_MSN, &cp->dev_desc[u], AUSI_DLEN-u-1); + if (ret >= 0) { + u += ret; + } + } + } + cp->dev_desc[u] = '\0'; + info("device is a %s", cp->dev_desc); + + /* get the maximum allowed control transfer length */ + pbuf = (__le16 *) kmalloc (2, GFP_KERNEL); /* use an allocated buffer because of urb target */ + if (!pbuf) { + err( "out of memory"); + goto pfail; + } + ret = usb_control_msg(cp->usbdev, /* pointer to device */ + usb_rcvctrlpipe( cp->usbdev, 0 ), /* pipe to control endpoint */ + AUV_GETINFO, /* USB message request value */ + AUT_RREQ, /* USB message request type value */ + 0, /* USB message value */ + AUDI_MBCTRANS, /* USB message index value */ + pbuf, /* pointer to the receive buffer */ + 2, /* length of the buffer */ + 2000); /* time to wait for the message to complete before timing out */ + if (ret == 2) { + cp->maxControlLength = le16_to_cpup(pbuf); + kfree(pbuf); + dbg("setup: max. allowed control transfersize is %d bytes", cp->maxControlLength); + } else { + kfree(pbuf); + err("setup: getting max. allowed control transfer length failed with error %d", ret); + goto pfail; + } + + /* allocate a chain for the control messages */ + if (auerchain_setup (&cp->controlchain, AUCH_ELEMENTS)) { + err ("out of memory"); + goto pfail; + } + + /* allocate buffers for control messages */ + if (auerbuf_setup (&cp->bufctl, AU_RBUFFERS, cp->maxControlLength+AUH_SIZE)) { + err ("out of memory"); + goto pfail; + } + + /* start the interrupt endpoint */ + if (auerswald_int_open (cp)) { + err ("int endpoint failed"); + goto pfail; + } + + /* all OK */ + usb_set_intfdata (intf, cp); + return 0; + + /* Error exit: clean up the memory */ +pfail: auerswald_delete (cp); + return -EIO; +} + + +/* Disconnect driver from a served device + + This function is called whenever a device which was served by this driver + is disconnected. + + The argument dev specifies the device context and the driver_context + returns a pointer to the previously registered driver_context of the + probe function. After returning from the disconnect function the USB + framework completely deallocates all data structures associated with + this device. So especially the usb_device structure must not be used + any longer by the usb driver. +*/ +static void auerswald_disconnect (struct usb_interface *intf) +{ + pauerswald_t cp = usb_get_intfdata (intf); + unsigned int u; + + usb_set_intfdata (intf, NULL); + if (!cp) + return; + + down (&cp->mutex); + info ("device /dev/%s now disconnecting", cp->name); + + /* give back our USB minor number */ + usb_deregister_dev(intf, &auerswald_class); + + /* Stop the interrupt endpoint */ + auerswald_int_release (cp); + + /* remove the control chain allocated in auerswald_probe + This has the benefit of + a) all pending (a)synchronous urbs are unlinked + b) all buffers dealing with urbs are reclaimed + */ + auerchain_free (&cp->controlchain); + + if (cp->open_count == 0) { + /* nobody is using this device. So we can clean up now */ + up (&cp->mutex);/* up() is possible here because no other task + can open the device (see above). I don't want + to kfree() a locked mutex. */ + auerswald_delete (cp); + } else { + /* device is used. Remove the pointer to the + usb device (it's not valid any more). The last + release() will do the clean up */ + cp->usbdev = NULL; + up (&cp->mutex); + /* Terminate waiting writers */ + wake_up (&cp->bufferwait); + /* Inform all waiting readers */ + for ( u = 0; u < AUH_TYPESIZE; u++) { + pauerscon_t scp = cp->services[u]; + if (scp) + scp->disconnect( scp); + } + } +} + +/* Descriptor for the devices which are served by this driver. + NOTE: this struct is parsed by the usbmanager install scripts. + Don't change without caution! +*/ +static struct usb_device_id auerswald_ids [] = { + { USB_DEVICE (ID_AUERSWALD, 0x00C0) }, /* COMpact 2104 USB */ + { USB_DEVICE (ID_AUERSWALD, 0x00DB) }, /* COMpact 4410/2206 USB */ + { USB_DEVICE (ID_AUERSWALD, 0x00F1) }, /* Comfort 2000 System Telephone */ + { USB_DEVICE (ID_AUERSWALD, 0x00F2) }, /* Comfort 1200 System Telephone */ + { } /* Terminating entry */ +}; + +/* Standard module device table */ +MODULE_DEVICE_TABLE (usb, auerswald_ids); + +/* Standard usb driver struct */ +static struct usb_driver auerswald_driver = { + .owner = THIS_MODULE, + .name = "auerswald", + .probe = auerswald_probe, + .disconnect = auerswald_disconnect, + .id_table = auerswald_ids, +}; + + +/* --------------------------------------------------------------------- */ +/* Module loading/unloading */ + +/* Driver initialisation. Called after module loading. + NOTE: there is no concurrency at _init +*/ +static int __init auerswald_init (void) +{ + int result; + dbg ("init"); + + /* register driver at the USB subsystem */ + result = usb_register (&auerswald_driver); + if (result < 0) { + err ("driver could not be registered"); + return -1; + } + return 0; +} + +/* Driver deinit. Called before module removal. + NOTE: there is no concurrency at _cleanup +*/ +static void __exit auerswald_cleanup (void) +{ + dbg ("cleanup"); + usb_deregister (&auerswald_driver); +} + +/* --------------------------------------------------------------------- */ +/* Linux device driver module description */ + +MODULE_AUTHOR (DRIVER_AUTHOR); +MODULE_DESCRIPTION (DRIVER_DESC); +MODULE_LICENSE ("GPL"); + +module_init (auerswald_init); +module_exit (auerswald_cleanup); + +/* --------------------------------------------------------------------- */ + |