1 /*****************************************************************************/
3 * auerswald.c -- Auerswald PBX/System Telephone usb driver.
5 * Copyright (C) 2001 Wolfgang Mües (wolfgang@iksw-muees.de)
7 * Very much code of this driver is borrowed from dabusb.c (Deti Fliegl)
8 * and from the USB Skeleton driver (Greg Kroah-Hartman). Thank you.
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 /*****************************************************************************/
26 /* Standard Linux module include files */
27 #include <asm/uaccess.h>
28 #include <asm/byteorder.h>
29 #include <linux/slab.h>
30 #include <linux/module.h>
31 #include <linux/init.h>
32 #include <linux/wait.h>
33 #undef DEBUG /* include debug macros until it's done */
34 #include <linux/usb.h>
36 /*-------------------------------------------------------------------*/
39 #define dump( adr, len) \
42 printk (KERN_DEBUG); \
43 for (u = 0; u < len; u++) \
44 printk (" %02X", adr[u] & 0xFF); \
48 #define dump( adr, len)
51 /*-------------------------------------------------------------------*/
52 /* Version Information */
53 #define DRIVER_VERSION "0.9.11"
54 #define DRIVER_AUTHOR "Wolfgang Mües <wolfgang@iksw-muees.de>"
55 #define DRIVER_DESC "Auerswald PBX/System Telephone usb driver"
57 /*-------------------------------------------------------------------*/
58 /* Private declarations for Auerswald USB driver */
60 /* Auerswald Vendor ID */
61 #define ID_AUERSWALD 0x09BF
63 #define AUER_MINOR_BASE 112 /* auerswald driver minor number */
65 /* we can have up to this number of device plugged in at once */
66 #define AUER_MAX_DEVICES 16
69 /* Number of read buffers for each device */
70 #define AU_RBUFFERS 10
72 /* Number of chain elements for each control chain */
73 #define AUCH_ELEMENTS 20
75 /* Number of retries in communication */
78 /*-------------------------------------------------------------------*/
79 /* vendor specific protocol */
81 #define AUH_INDIRMASK 0x80 /* mask for direct/indirect bit */
82 #define AUH_DIRECT 0x00 /* data is for USB device */
83 #define AUH_INDIRECT 0x80 /* USB device is relay */
85 #define AUH_SPLITMASK 0x40 /* mask for split bit */
86 #define AUH_UNSPLIT 0x00 /* data block is full-size */
87 #define AUH_SPLIT 0x40 /* data block is part of a larger one,
90 #define AUH_TYPEMASK 0x3F /* mask for type of data transfer */
91 #define AUH_TYPESIZE 0x40 /* different types */
92 #define AUH_DCHANNEL 0x00 /* D channel data */
93 #define AUH_B1CHANNEL 0x01 /* B1 channel transparent */
94 #define AUH_B2CHANNEL 0x02 /* B2 channel transparent */
95 /* 0x03..0x0F reserved for driver internal use */
96 #define AUH_COMMAND 0x10 /* Command channel */
97 #define AUH_BPROT 0x11 /* Configuration block protocol */
98 #define AUH_DPROTANA 0x12 /* D channel protocol analyzer */
99 #define AUH_TAPI 0x13 /* telephone api data (ATD) */
100 /* 0x14..0x3F reserved for other protocols */
101 #define AUH_UNASSIGNED 0xFF /* if char device has no assigned service */
102 #define AUH_FIRSTUSERCH 0x11 /* first channel which is available for driver users */
104 #define AUH_SIZE 1 /* Size of Header Byte */
106 /* Split Byte. Only present if split bit in header byte set.*/
107 #define AUS_STARTMASK 0x80 /* mask for first block of splitted frame */
108 #define AUS_FIRST 0x80 /* first block */
109 #define AUS_FOLLOW 0x00 /* following block */
111 #define AUS_ENDMASK 0x40 /* mask for last block of splitted frame */
112 #define AUS_END 0x40 /* last block */
113 #define AUS_NOEND 0x00 /* not the last block */
115 #define AUS_LENMASK 0x3F /* mask for block length information */
118 #define AUT_RREQ (USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_OTHER) /* Read Request */
119 #define AUT_WREQ (USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_OTHER) /* Write Request */
121 /* Vendor Requests */
122 #define AUV_GETINFO 0x00 /* GetDeviceInfo */
123 #define AUV_WBLOCK 0x01 /* Write Block */
124 #define AUV_RBLOCK 0x02 /* Read Block */
125 #define AUV_CHANNELCTL 0x03 /* Channel Control */
126 #define AUV_DUMMY 0x04 /* Dummy Out for retry */
128 /* Device Info Types */
129 #define AUDI_NUMBCH 0x0000 /* Number of supported B channels */
130 #define AUDI_OUTFSIZE 0x0001 /* Size of OUT B channel fifos */
131 #define AUDI_MBCTRANS 0x0002 /* max. Blocklength of control transfer */
133 /* Interrupt endpoint definitions */
134 #define AU_IRQENDP 1 /* Endpoint number */
135 #define AU_IRQCMDID 16 /* Command-block ID */
136 #define AU_BLOCKRDY 0 /* Command: Block data ready on ctl endpoint */
137 #define AU_IRQMINSIZE 5 /* Nr. of bytes decoded in this driver */
139 /* Device String Descriptors */
140 #define AUSI_VENDOR 1 /* "Auerswald GmbH & Co. KG" */
141 #define AUSI_DEVICE 2 /* Name of the Device */
142 #define AUSI_SERIALNR 3 /* Serial Number */
143 #define AUSI_MSN 4 /* "MSN ..." (first) Multiple Subscriber Number */
145 #define AUSI_DLEN 100 /* Max. Length of Device Description */
147 #define AUV_RETRY 0x101 /* First Firmware version which can do control retries */
149 /*-------------------------------------------------------------------*/
150 /* External data structures / Interface */
153 char __user *buf; /* return buffer for string contents */
154 unsigned int bsize; /* size of return buffer */
155 } audevinfo_t,*paudevinfo_t;
158 #define IOCTL_AU_SLEN _IOR( 'U', 0xF0, int) /* return the max. string descriptor length */
159 #define IOCTL_AU_DEVINFO _IOWR('U', 0xF1, audevinfo_t) /* get name of a specific device */
160 #define IOCTL_AU_SERVREQ _IOW( 'U', 0xF2, int) /* request a service channel */
161 #define IOCTL_AU_BUFLEN _IOR( 'U', 0xF3, int) /* return the max. buffer length for the device */
162 #define IOCTL_AU_RXAVAIL _IOR( 'U', 0xF4, int) /* return != 0 if Receive Data available */
163 #define IOCTL_AU_CONNECT _IOR( 'U', 0xF5, int) /* return != 0 if connected to a service channel */
164 #define IOCTL_AU_TXREADY _IOR( 'U', 0xF6, int) /* return != 0 if Transmitt channel ready to send */
165 /* 'U' 0xF7..0xFF reseved */
167 /*-------------------------------------------------------------------*/
168 /* Internal data structures */
170 /* ..................................................................*/
171 /* urb chain element */
172 struct auerchain; /* forward for circular reference */
175 struct auerchain *chain; /* pointer to the chain to which this element belongs */
176 struct urb * urbp; /* pointer to attached urb */
177 void *context; /* saved URB context */
178 usb_complete_t complete; /* saved URB completion function */
179 struct list_head list; /* to include element into a list */
180 } auerchainelement_t,*pauerchainelement_t;
183 typedef struct auerchain
185 pauerchainelement_t active; /* element which is submitted to urb */
186 spinlock_t lock; /* protection agains interrupts */
187 struct list_head waiting_list; /* list of waiting elements */
188 struct list_head free_list; /* list of available elements */
189 } auerchain_t,*pauerchain_t;
191 /* urb blocking completion helper struct */
194 wait_queue_head_t wqh; /* wait for completion */
195 unsigned int done; /* completion flag */
196 } auerchain_chs_t,*pauerchain_chs_t;
198 /* ...................................................................*/
200 struct auerbufctl; /* forward */
203 char *bufp; /* reference to allocated data buffer */
204 unsigned int len; /* number of characters in data buffer */
205 unsigned int retries; /* for urb retries */
206 struct usb_ctrlrequest *dr; /* for setup data in control messages */
207 struct urb * urbp; /* USB urb */
208 struct auerbufctl *list; /* pointer to list */
209 struct list_head buff_list; /* reference to next buffer in list */
210 } auerbuf_t,*pauerbuf_t;
212 /* buffer list control block */
213 typedef struct auerbufctl
215 spinlock_t lock; /* protection in interrupt */
216 struct list_head free_buff_list;/* free buffers */
217 struct list_head rec_buff_list; /* buffers with receive data */
218 } auerbufctl_t,*pauerbufctl_t;
220 /* ...................................................................*/
221 /* service context */
222 struct auerscon; /* forward */
223 typedef void (*auer_dispatch_t)(struct auerscon*, pauerbuf_t);
224 typedef void (*auer_disconn_t) (struct auerscon*);
225 typedef struct auerscon
227 unsigned int id; /* protocol service id AUH_xxxx */
228 auer_dispatch_t dispatch; /* dispatch read buffer */
229 auer_disconn_t disconnect; /* disconnect from device, wake up all char readers */
230 } auerscon_t,*pauerscon_t;
232 /* ...................................................................*/
233 /* USB device context */
236 struct semaphore mutex; /* protection in user context */
237 char name[20]; /* name of the /dev/usb entry */
238 unsigned int dtindex; /* index in the device table */
239 struct usb_device * usbdev; /* USB device handle */
240 int open_count; /* count the number of open character channels */
241 char dev_desc[AUSI_DLEN];/* for storing a textual description */
242 unsigned int maxControlLength; /* max. Length of control paket (without header) */
243 struct urb * inturbp; /* interrupt urb */
244 char * intbufp; /* data buffer for interrupt urb */
245 unsigned int irqsize; /* size of interrupt endpoint 1 */
246 struct auerchain controlchain; /* for chaining of control messages */
247 auerbufctl_t bufctl; /* Buffer control for control transfers */
248 pauerscon_t services[AUH_TYPESIZE];/* context pointers for each service */
249 unsigned int version; /* Version of the device */
250 wait_queue_head_t bufferwait; /* wait for a control buffer */
251 } auerswald_t,*pauerswald_t;
253 /* ................................................................... */
254 /* character device context */
257 struct semaphore mutex; /* protection in user context */
258 pauerswald_t auerdev; /* context pointer of assigned device */
259 auerbufctl_t bufctl; /* controls the buffer chain */
260 auerscon_t scontext; /* service context */
261 wait_queue_head_t readwait; /* for synchronous reading */
262 struct semaphore readmutex; /* protection against multiple reads */
263 pauerbuf_t readbuf; /* buffer held for partial reading */
264 unsigned int readoffset; /* current offset in readbuf */
265 unsigned int removed; /* is != 0 if device is removed */
266 } auerchar_t,*pauerchar_t;
269 /*-------------------------------------------------------------------*/
271 static void auerswald_ctrlread_complete (struct urb * urb, struct pt_regs *regs);
272 static void auerswald_removeservice (pauerswald_t cp, pauerscon_t scp);
273 static struct usb_driver auerswald_driver;
276 /*-------------------------------------------------------------------*/
277 /* USB chain helper functions */
278 /* -------------------------- */
280 /* completion function for chained urbs */
281 static void auerchain_complete (struct urb * urb, struct pt_regs *regs)
286 /* get pointer to element and to chain */
287 pauerchainelement_t acep = (pauerchainelement_t) urb->context;
288 pauerchain_t acp = acep->chain;
290 /* restore original entries in urb */
291 urb->context = acep->context;
292 urb->complete = acep->complete;
294 dbg ("auerchain_complete called");
296 /* call original completion function
297 NOTE: this function may lead to more urbs submitted into the chain.
298 (no chain lock at calling complete()!)
299 acp->active != NULL is protecting us against recursion.*/
300 urb->complete (urb, regs);
302 /* detach element from chain data structure */
303 spin_lock_irqsave (&acp->lock, flags);
304 if (acp->active != acep) /* paranoia debug check */
305 dbg ("auerchain_complete: completion on non-active element called!");
309 /* add the used chain element to the list of free elements */
310 list_add_tail (&acep->list, &acp->free_list);
313 /* is there a new element waiting in the chain? */
314 if (!acp->active && !list_empty (&acp->waiting_list)) {
315 /* yes: get the entry */
316 struct list_head *tmp = acp->waiting_list.next;
318 acep = list_entry (tmp, auerchainelement_t, list);
321 spin_unlock_irqrestore (&acp->lock, flags);
323 /* submit the new urb */
326 dbg ("auerchain_complete: submitting next urb from chain");
327 urb->status = 0; /* needed! */
328 result = usb_submit_urb(urb, GFP_ATOMIC);
330 /* check for submit errors */
332 urb->status = result;
333 dbg("auerchain_complete: usb_submit_urb with error code %d", result);
334 /* and do error handling via *this* completion function (recursive) */
335 auerchain_complete( urb, NULL);
338 /* simple return without submitting a new urb.
339 The empty chain is detected with acp->active == NULL. */
344 /* submit function for chained urbs
345 this function may be called from completion context or from user space!
346 early = 1 -> submit in front of chain
348 static int auerchain_submit_urb_list (pauerchain_t acp, struct urb * urb, int early)
352 pauerchainelement_t acep = NULL;
354 dbg ("auerchain_submit_urb called");
356 /* try to get a chain element */
357 spin_lock_irqsave (&acp->lock, flags);
358 if (!list_empty (&acp->free_list)) {
359 /* yes: get the entry */
360 struct list_head *tmp = acp->free_list.next;
362 acep = list_entry (tmp, auerchainelement_t, list);
364 spin_unlock_irqrestore (&acp->lock, flags);
366 /* if no chain element available: return with error */
371 /* fill in the new chain element values */
373 acep->context = urb->context;
374 acep->complete = urb->complete;
376 INIT_LIST_HEAD (&acep->list);
380 urb->complete = auerchain_complete;
381 urb->status = -EINPROGRESS; /* usb_submit_urb does this, too */
383 /* add element to chain - or start it immediately */
384 spin_lock_irqsave (&acp->lock, flags);
386 /* there is traffic in the chain, simple add element to chain */
388 dbg ("adding new urb to head of chain");
389 list_add (&acep->list, &acp->waiting_list);
391 dbg ("adding new urb to end of chain");
392 list_add_tail (&acep->list, &acp->waiting_list);
396 /* the chain is empty. Prepare restart */
399 /* Spin has to be removed before usb_submit_urb! */
400 spin_unlock_irqrestore (&acp->lock, flags);
402 /* Submit urb if immediate restart */
404 dbg("submitting urb immediate");
405 urb->status = 0; /* needed! */
406 result = usb_submit_urb(urb, GFP_ATOMIC);
407 /* check for submit errors */
409 urb->status = result;
410 dbg("auerchain_submit_urb: usb_submit_urb with error code %d", result);
411 /* and do error handling via completion function */
412 auerchain_complete( urb, NULL);
419 /* submit function for chained urbs
420 this function may be called from completion context or from user space!
422 static int auerchain_submit_urb (pauerchain_t acp, struct urb * urb)
424 return auerchain_submit_urb_list (acp, urb, 0);
427 /* cancel an urb which is submitted to the chain
428 the result is 0 if the urb is cancelled, or -EINPROGRESS if
429 the function is successfully started.
431 static int auerchain_unlink_urb (pauerchain_t acp, struct urb * urb)
435 pauerchainelement_t acep;
436 struct list_head *tmp;
438 dbg ("auerchain_unlink_urb called");
440 /* search the chain of waiting elements */
441 spin_lock_irqsave (&acp->lock, flags);
442 list_for_each (tmp, &acp->waiting_list) {
443 acep = list_entry (tmp, auerchainelement_t, list);
444 if (acep->urbp == urb) {
446 urb->context = acep->context;
447 urb->complete = acep->complete;
448 list_add_tail (&acep->list, &acp->free_list);
449 spin_unlock_irqrestore (&acp->lock, flags);
450 dbg ("unlink waiting urb");
451 urb->status = -ENOENT;
452 urb->complete (urb, NULL);
457 spin_unlock_irqrestore (&acp->lock, flags);
459 /* get the active urb */
464 /* check if we have to cancel the active urb */
466 /* note that there is a race condition between the check above
467 and the unlink() call because of no lock. This race is harmless,
468 because the usb module will detect the unlink() after completion.
469 We can't use the acp->lock here because the completion function
472 dbg ("unlink active urb");
473 return usb_unlink_urb (urbp);
478 ... is some kind of success
480 dbg ("urb to unlink not found in chain");
484 /* cancel all urbs which are in the chain.
485 this function must not be called from interrupt or completion handler.
487 static void auerchain_unlink_all (pauerchain_t acp)
491 pauerchainelement_t acep;
493 dbg ("auerchain_unlink_all called");
495 /* clear the chain of waiting elements */
496 spin_lock_irqsave (&acp->lock, flags);
497 while (!list_empty (&acp->waiting_list)) {
498 /* get the next entry */
499 struct list_head *tmp = acp->waiting_list.next;
501 acep = list_entry (tmp, auerchainelement_t, list);
503 urbp->context = acep->context;
504 urbp->complete = acep->complete;
505 list_add_tail (&acep->list, &acp->free_list);
506 spin_unlock_irqrestore (&acp->lock, flags);
507 dbg ("unlink waiting urb");
508 urbp->status = -ENOENT;
509 urbp->complete (urbp, NULL);
510 spin_lock_irqsave (&acp->lock, flags);
512 spin_unlock_irqrestore (&acp->lock, flags);
514 /* clear the active urb */
518 dbg ("unlink active urb");
525 this function must not be called from interrupt or completion handler.
527 static void auerchain_free (pauerchain_t acp)
530 pauerchainelement_t acep;
532 dbg ("auerchain_free called");
534 /* first, cancel all pending urbs */
535 auerchain_unlink_all (acp);
537 /* free the elements */
538 spin_lock_irqsave (&acp->lock, flags);
539 while (!list_empty (&acp->free_list)) {
540 /* get the next entry */
541 struct list_head *tmp = acp->free_list.next;
543 spin_unlock_irqrestore (&acp->lock, flags);
544 acep = list_entry (tmp, auerchainelement_t, list);
546 spin_lock_irqsave (&acp->lock, flags);
548 spin_unlock_irqrestore (&acp->lock, flags);
552 /* Init the chain control structure */
553 static void auerchain_init (pauerchain_t acp)
555 /* init the chain data structure */
557 spin_lock_init (&acp->lock);
558 INIT_LIST_HEAD (&acp->waiting_list);
559 INIT_LIST_HEAD (&acp->free_list);
563 It is assumed that there is no concurrency while setting up the chain
564 requirement: auerchain_init()
566 static int auerchain_setup (pauerchain_t acp, unsigned int numElements)
568 pauerchainelement_t acep;
570 dbg ("auerchain_setup called with %d elements", numElements);
572 /* fill the list of free elements */
573 for (;numElements; numElements--) {
574 acep = (pauerchainelement_t) kmalloc (sizeof (auerchainelement_t), GFP_KERNEL);
577 memset (acep, 0, sizeof (auerchainelement_t));
578 INIT_LIST_HEAD (&acep->list);
579 list_add_tail (&acep->list, &acp->free_list);
583 ac_fail:/* free the elements */
584 while (!list_empty (&acp->free_list)) {
585 /* get the next entry */
586 struct list_head *tmp = acp->free_list.next;
588 acep = list_entry (tmp, auerchainelement_t, list);
595 /* completion handler for synchronous chained URBs */
596 static void auerchain_blocking_completion (struct urb *urb, struct pt_regs *regs)
598 pauerchain_chs_t pchs = (pauerchain_chs_t)urb->context;
601 wake_up (&pchs->wqh);
605 /* Starts chained urb and waits for completion or timeout */
606 static int auerchain_start_wait_urb (pauerchain_t acp, struct urb *urb, int timeout, int* actual_length)
611 dbg ("auerchain_start_wait_urb called");
612 init_waitqueue_head (&chs.wqh);
616 status = auerchain_submit_urb (acp, urb);
618 /* something went wrong */
621 timeout = wait_event_timeout(chs.wqh, chs.done, timeout);
623 if (!timeout && !chs.done) {
624 if (urb->status != -EINPROGRESS) { /* No callback?!! */
625 dbg ("auerchain_start_wait_urb: raced timeout");
626 status = urb->status;
628 dbg ("auerchain_start_wait_urb: timeout");
629 auerchain_unlink_urb (acp, urb); /* remove urb safely */
633 status = urb->status;
636 *actual_length = urb->actual_length;
642 /* auerchain_control_msg - Builds a control urb, sends it off and waits for completion
643 acp: pointer to the auerchain
644 dev: pointer to the usb device to send the message to
645 pipe: endpoint "pipe" to send the message to
646 request: USB message request value
647 requesttype: USB message request type value
648 value: USB message value
649 index: USB message index value
650 data: pointer to the data to send
651 size: length in bytes of the data to send
652 timeout: time to wait for the message to complete before timing out (if 0 the wait is forever)
654 This function sends a simple control message to a specified endpoint
655 and waits for the message to complete, or timeout.
657 If successful, it returns the transferred length, otherwise a negative error number.
659 Don't use this function from within an interrupt context, like a
660 bottom half handler. If you need an asynchronous message, or need to send
661 a message from within interrupt context, use auerchain_submit_urb()
663 static int auerchain_control_msg (pauerchain_t acp, struct usb_device *dev, unsigned int pipe, __u8 request, __u8 requesttype,
664 __u16 value, __u16 index, void *data, __u16 size, int timeout)
667 struct usb_ctrlrequest *dr;
671 dbg ("auerchain_control_msg");
672 dr = kmalloc (sizeof (struct usb_ctrlrequest), GFP_KERNEL);
675 urb = usb_alloc_urb (0, GFP_KERNEL);
681 dr->bRequestType = requesttype;
682 dr->bRequest = request;
683 dr->wValue = cpu_to_le16 (value);
684 dr->wIndex = cpu_to_le16 (index);
685 dr->wLength = cpu_to_le16 (size);
687 usb_fill_control_urb (urb, dev, pipe, (unsigned char*)dr, data, size, /* build urb */
688 auerchain_blocking_completion, NULL);
689 ret = auerchain_start_wait_urb (acp, urb, timeout, &length);
701 /*-------------------------------------------------------------------*/
702 /* Buffer List helper functions */
704 /* free a single auerbuf */
705 static void auerbuf_free (pauerbuf_t bp)
710 usb_free_urb(bp->urbp);
715 /* free the buffers from an auerbuf list */
716 static void auerbuf_free_list (struct list_head *q)
718 struct list_head *tmp;
722 dbg ("auerbuf_free_list");
723 for (p = q->next; p != q;) {
724 bp = list_entry (p, auerbuf_t, buff_list);
732 /* init the members of a list control block */
733 static void auerbuf_init (pauerbufctl_t bcp)
735 dbg ("auerbuf_init");
736 spin_lock_init (&bcp->lock);
737 INIT_LIST_HEAD (&bcp->free_buff_list);
738 INIT_LIST_HEAD (&bcp->rec_buff_list);
741 /* free all buffers from an auerbuf chain */
742 static void auerbuf_free_buffers (pauerbufctl_t bcp)
745 dbg ("auerbuf_free_buffers");
747 spin_lock_irqsave (&bcp->lock, flags);
749 auerbuf_free_list (&bcp->free_buff_list);
750 auerbuf_free_list (&bcp->rec_buff_list);
752 spin_unlock_irqrestore (&bcp->lock, flags);
755 /* setup a list of buffers */
756 /* requirement: auerbuf_init() */
757 static int auerbuf_setup (pauerbufctl_t bcp, unsigned int numElements, unsigned int bufsize)
759 pauerbuf_t bep = NULL;
761 dbg ("auerbuf_setup called with %d elements of %d bytes", numElements, bufsize);
763 /* fill the list of free elements */
764 for (;numElements; numElements--) {
765 bep = (pauerbuf_t) kmalloc (sizeof (auerbuf_t), GFP_KERNEL);
768 memset (bep, 0, sizeof (auerbuf_t));
770 INIT_LIST_HEAD (&bep->buff_list);
771 bep->bufp = (char *) kmalloc (bufsize, GFP_KERNEL);
774 bep->dr = (struct usb_ctrlrequest *) kmalloc (sizeof (struct usb_ctrlrequest), GFP_KERNEL);
777 bep->urbp = usb_alloc_urb (0, GFP_KERNEL);
780 list_add_tail (&bep->buff_list, &bcp->free_buff_list);
784 bl_fail:/* not enough memory. Free allocated elements */
785 dbg ("auerbuf_setup: no more memory");
787 auerbuf_free_buffers (bcp);
791 /* insert a used buffer into the free list */
792 static void auerbuf_releasebuf( pauerbuf_t bp)
795 pauerbufctl_t bcp = bp->list;
798 dbg ("auerbuf_releasebuf called");
799 spin_lock_irqsave (&bcp->lock, flags);
800 list_add_tail (&bp->buff_list, &bcp->free_buff_list);
801 spin_unlock_irqrestore (&bcp->lock, flags);
805 /*-------------------------------------------------------------------*/
806 /* Completion handlers */
808 /* Values of urb->status or results of usb_submit_urb():
810 -EINPROGRESS during submission until end
811 -ENOENT if urb is unlinked
812 -ETIMEDOUT Transfer timed out, NAK
813 -ENOMEM Memory Overflow
814 -ENODEV Specified USB-device or bus doesn't exist
815 -ENXIO URB already queued
816 -EINVAL a) Invalid transfer type specified (or not supported)
817 b) Invalid interrupt interval (0n256)
818 -EAGAIN a) Specified ISO start frame too early
819 b) (using ISO-ASAP) Too much scheduled for the future wait some time and try again.
820 -EFBIG Too much ISO frames requested (currently uhci900)
821 -EPIPE Specified pipe-handle/Endpoint is already stalled
822 -EMSGSIZE Endpoint message size is zero, do interface/alternate setting
823 -EPROTO a) Bitstuff error
827 -EREMOTEIO Short packet detected
828 -EXDEV ISO transfer only partially completed look at individual frame status for details
829 -EINVAL ISO madness, if this happens: Log off and go home
833 /* check if a status code allows a retry */
834 static int auerswald_status_retry (int status)
846 return 1; /* do a retry */
848 return 0; /* no retry possible */
851 /* Completion of asynchronous write block */
852 static void auerchar_ctrlwrite_complete (struct urb * urb, struct pt_regs *regs)
854 pauerbuf_t bp = (pauerbuf_t) urb->context;
855 pauerswald_t cp = ((pauerswald_t)((char *)(bp->list)-(unsigned long)(&((pauerswald_t)0)->bufctl)));
856 dbg ("auerchar_ctrlwrite_complete called");
858 /* reuse the buffer */
859 auerbuf_releasebuf (bp);
860 /* Wake up all processes waiting for a buffer */
861 wake_up (&cp->bufferwait);
864 /* Completion handler for dummy retry packet */
865 static void auerswald_ctrlread_wretcomplete (struct urb * urb, struct pt_regs *regs)
867 pauerbuf_t bp = (pauerbuf_t) urb->context;
870 dbg ("auerswald_ctrlread_wretcomplete called");
871 dbg ("complete with status: %d", urb->status);
872 cp = ((pauerswald_t)((char *)(bp->list)-(unsigned long)(&((pauerswald_t)0)->bufctl)));
874 /* check if it is possible to advance */
875 if (!auerswald_status_retry (urb->status) || !cp->usbdev) {
876 /* reuse the buffer */
877 err ("control dummy: transmission error %d, can not retry", urb->status);
878 auerbuf_releasebuf (bp);
879 /* Wake up all processes waiting for a buffer */
880 wake_up (&cp->bufferwait);
884 /* fill the control message */
885 bp->dr->bRequestType = AUT_RREQ;
886 bp->dr->bRequest = AUV_RBLOCK;
887 bp->dr->wLength = bp->dr->wValue; /* temporary stored */
888 bp->dr->wValue = cpu_to_le16 (1); /* Retry Flag */
889 /* bp->dr->index = channel id; remains */
890 usb_fill_control_urb (bp->urbp, cp->usbdev, usb_rcvctrlpipe (cp->usbdev, 0),
891 (unsigned char*)bp->dr, bp->bufp, le16_to_cpu (bp->dr->wLength),
892 auerswald_ctrlread_complete,bp);
894 /* submit the control msg as next paket */
895 ret = auerchain_submit_urb_list (&cp->controlchain, bp->urbp, 1);
897 dbg ("auerswald_ctrlread_complete: nonzero result of auerchain_submit_urb_list %d", ret);
898 bp->urbp->status = ret;
899 auerswald_ctrlread_complete (bp->urbp, NULL);
903 /* completion handler for receiving of control messages */
904 static void auerswald_ctrlread_complete (struct urb * urb, struct pt_regs *regs)
906 unsigned int serviceid;
909 pauerbuf_t bp = (pauerbuf_t) urb->context;
911 dbg ("auerswald_ctrlread_complete called");
913 cp = ((pauerswald_t)((char *)(bp->list)-(unsigned long)(&((pauerswald_t)0)->bufctl)));
915 /* check if there is valid data in this urb */
917 dbg ("complete with non-zero status: %d", urb->status);
918 /* should we do a retry? */
919 if (!auerswald_status_retry (urb->status)
921 || (cp->version < AUV_RETRY)
922 || (bp->retries >= AU_RETRIES)) {
923 /* reuse the buffer */
924 err ("control read: transmission error %d, can not retry", urb->status);
925 auerbuf_releasebuf (bp);
926 /* Wake up all processes waiting for a buffer */
927 wake_up (&cp->bufferwait);
931 dbg ("Retry count = %d", bp->retries);
932 /* send a long dummy control-write-message to allow device firmware to react */
933 bp->dr->bRequestType = AUT_WREQ;
934 bp->dr->bRequest = AUV_DUMMY;
935 bp->dr->wValue = bp->dr->wLength; /* temporary storage */
936 // bp->dr->wIndex channel ID remains
937 bp->dr->wLength = cpu_to_le16 (32); /* >= 8 bytes */
938 usb_fill_control_urb (bp->urbp, cp->usbdev, usb_sndctrlpipe (cp->usbdev, 0),
939 (unsigned char*)bp->dr, bp->bufp, 32,
940 auerswald_ctrlread_wretcomplete,bp);
942 /* submit the control msg as next paket */
943 ret = auerchain_submit_urb_list (&cp->controlchain, bp->urbp, 1);
945 dbg ("auerswald_ctrlread_complete: nonzero result of auerchain_submit_urb_list %d", ret);
946 bp->urbp->status = ret;
947 auerswald_ctrlread_wretcomplete (bp->urbp, regs);
952 /* get the actual bytecount (incl. headerbyte) */
953 bp->len = urb->actual_length;
954 serviceid = bp->bufp[0] & AUH_TYPEMASK;
955 dbg ("Paket with serviceid %d and %d bytes received", serviceid, bp->len);
957 /* dispatch the paket */
958 scp = cp->services[serviceid];
960 /* look, Ma, a listener! */
961 scp->dispatch (scp, bp);
964 /* release the paket */
965 auerbuf_releasebuf (bp);
966 /* Wake up all processes waiting for a buffer */
967 wake_up (&cp->bufferwait);
970 /*-------------------------------------------------------------------*/
971 /* Handling of Interrupt Endpoint */
972 /* This interrupt Endpoint is used to inform the host about waiting
973 messages from the USB device.
975 /* int completion handler. */
976 static void auerswald_int_complete (struct urb * urb, struct pt_regs *regs)
979 unsigned int channelid;
980 unsigned int bytecount;
982 pauerbuf_t bp = NULL;
983 pauerswald_t cp = (pauerswald_t) urb->context;
985 dbg ("%s called", __FUNCTION__);
987 switch (urb->status) {
994 /* this urb is terminated, clean up */
995 dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
998 dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status);
1002 /* check if all needed data was received */
1003 if (urb->actual_length < AU_IRQMINSIZE) {
1004 dbg ("invalid data length received: %d bytes", urb->actual_length);
1008 /* check the command code */
1009 if (cp->intbufp[0] != AU_IRQCMDID) {
1010 dbg ("invalid command received: %d", cp->intbufp[0]);
1014 /* check the command type */
1015 if (cp->intbufp[1] != AU_BLOCKRDY) {
1016 dbg ("invalid command type received: %d", cp->intbufp[1]);
1020 /* now extract the information */
1021 channelid = cp->intbufp[2];
1022 bytecount = (unsigned char)cp->intbufp[3];
1023 bytecount |= (unsigned char)cp->intbufp[4] << 8;
1025 /* check the channel id */
1026 if (channelid >= AUH_TYPESIZE) {
1027 dbg ("invalid channel id received: %d", channelid);
1031 /* check the byte count */
1032 if (bytecount > (cp->maxControlLength+AUH_SIZE)) {
1033 dbg ("invalid byte count received: %d", bytecount);
1036 dbg ("Service Channel = %d", channelid);
1037 dbg ("Byte Count = %d", bytecount);
1039 /* get a buffer for the next data paket */
1040 spin_lock_irqsave (&cp->bufctl.lock, flags);
1041 if (!list_empty (&cp->bufctl.free_buff_list)) {
1042 /* yes: get the entry */
1043 struct list_head *tmp = cp->bufctl.free_buff_list.next;
1045 bp = list_entry (tmp, auerbuf_t, buff_list);
1047 spin_unlock_irqrestore (&cp->bufctl.lock, flags);
1049 /* if no buffer available: skip it */
1051 dbg ("auerswald_int_complete: no data buffer available");
1052 /* can we do something more?
1053 This is a big problem: if this int packet is ignored, the
1054 device will wait forever and not signal any more data.
1055 The only real solution is: having enough buffers!
1056 Or perhaps temporary disabling the int endpoint?
1061 /* fill the control message */
1062 bp->dr->bRequestType = AUT_RREQ;
1063 bp->dr->bRequest = AUV_RBLOCK;
1064 bp->dr->wValue = cpu_to_le16 (0);
1065 bp->dr->wIndex = cpu_to_le16 (channelid | AUH_DIRECT | AUH_UNSPLIT);
1066 bp->dr->wLength = cpu_to_le16 (bytecount);
1067 usb_fill_control_urb (bp->urbp, cp->usbdev, usb_rcvctrlpipe (cp->usbdev, 0),
1068 (unsigned char*)bp->dr, bp->bufp, bytecount,
1069 auerswald_ctrlread_complete,bp);
1071 /* submit the control msg */
1072 ret = auerchain_submit_urb (&cp->controlchain, bp->urbp);
1074 dbg ("auerswald_int_complete: nonzero result of auerchain_submit_urb %d", ret);
1075 bp->urbp->status = ret;
1076 auerswald_ctrlread_complete( bp->urbp, NULL);
1077 /* here applies the same problem as above: device locking! */
1080 ret = usb_submit_urb (urb, GFP_ATOMIC);
1082 err ("%s - usb_submit_urb failed with result %d",
1086 /* int memory deallocation
1087 NOTE: no mutex please!
1089 static void auerswald_int_free (pauerswald_t cp)
1092 usb_free_urb(cp->inturbp);
1099 /* This function is called to activate the interrupt
1100 endpoint. This function returns 0 if successful or an error code.
1101 NOTE: no mutex please!
1103 static int auerswald_int_open (pauerswald_t cp)
1106 struct usb_host_endpoint *ep;
1108 dbg ("auerswald_int_open");
1110 ep = cp->usbdev->ep_in[AU_IRQENDP];
1115 irqsize = le16_to_cpu(ep->desc.wMaxPacketSize);
1116 cp->irqsize = irqsize;
1118 /* allocate the urb and data buffer */
1120 cp->inturbp = usb_alloc_urb (0, GFP_KERNEL);
1127 cp->intbufp = (char *) kmalloc (irqsize, GFP_KERNEL);
1134 usb_fill_int_urb (cp->inturbp, cp->usbdev,
1135 usb_rcvintpipe (cp->usbdev,AU_IRQENDP), cp->intbufp,
1136 irqsize, auerswald_int_complete, cp, ep->desc.bInterval);
1138 cp->inturbp->status = 0; /* needed! */
1139 ret = usb_submit_urb (cp->inturbp, GFP_KERNEL);
1143 /* activation of interrupt endpoint has failed. Now clean up. */
1144 dbg ("auerswald_int_open: activation of int endpoint failed");
1146 /* deallocate memory */
1147 auerswald_int_free (cp);
1152 /* This function is called to deactivate the interrupt
1153 endpoint. This function returns 0 if successful or an error code.
1154 NOTE: no mutex please!
1156 static void auerswald_int_release (pauerswald_t cp)
1158 dbg ("auerswald_int_release");
1160 /* stop the int endpoint */
1162 usb_kill_urb (cp->inturbp);
1164 /* deallocate memory */
1165 auerswald_int_free (cp);
1168 /* --------------------------------------------------------------------- */
1169 /* Helper functions */
1171 /* wake up waiting readers */
1172 static void auerchar_disconnect (pauerscon_t scp)
1174 pauerchar_t ccp = ((pauerchar_t)((char *)(scp)-(unsigned long)(&((pauerchar_t)0)->scontext)));
1175 dbg ("auerchar_disconnect called");
1177 wake_up (&ccp->readwait);
1181 /* dispatch a read paket to a waiting character device */
1182 static void auerchar_ctrlread_dispatch (pauerscon_t scp, pauerbuf_t bp)
1184 unsigned long flags;
1186 pauerbuf_t newbp = NULL;
1188 dbg ("auerchar_ctrlread_dispatch called");
1189 ccp = ((pauerchar_t)((char *)(scp)-(unsigned long)(&((pauerchar_t)0)->scontext)));
1191 /* get a read buffer from character device context */
1192 spin_lock_irqsave (&ccp->bufctl.lock, flags);
1193 if (!list_empty (&ccp->bufctl.free_buff_list)) {
1194 /* yes: get the entry */
1195 struct list_head *tmp = ccp->bufctl.free_buff_list.next;
1197 newbp = list_entry (tmp, auerbuf_t, buff_list);
1199 spin_unlock_irqrestore (&ccp->bufctl.lock, flags);
1202 dbg ("No read buffer available, discard paket!");
1203 return; /* no buffer, no dispatch */
1206 /* copy information to new buffer element
1207 (all buffers have the same length) */
1208 charp = newbp->bufp;
1209 newbp->bufp = bp->bufp;
1211 newbp->len = bp->len;
1213 /* insert new buffer in read list */
1214 spin_lock_irqsave (&ccp->bufctl.lock, flags);
1215 list_add_tail (&newbp->buff_list, &ccp->bufctl.rec_buff_list);
1216 spin_unlock_irqrestore (&ccp->bufctl.lock, flags);
1217 dbg ("read buffer appended to rec_list");
1219 /* wake up pending synchronous reads */
1220 wake_up (&ccp->readwait);
1224 /* Delete an auerswald driver context */
1225 static void auerswald_delete( pauerswald_t cp)
1227 dbg( "auerswald_delete");
1231 /* Wake up all processes waiting for a buffer */
1232 wake_up (&cp->bufferwait);
1235 auerswald_int_release (cp);
1236 auerchain_free (&cp->controlchain);
1237 auerbuf_free_buffers (&cp->bufctl);
1239 /* release the memory */
1244 /* Delete an auerswald character context */
1245 static void auerchar_delete( pauerchar_t ccp)
1247 dbg ("auerchar_delete");
1251 /* wake up pending synchronous reads */
1253 wake_up (&ccp->readwait);
1255 /* remove the read buffer */
1257 auerbuf_releasebuf (ccp->readbuf);
1258 ccp->readbuf = NULL;
1261 /* remove the character buffers */
1262 auerbuf_free_buffers (&ccp->bufctl);
1264 /* release the memory */
1269 /* add a new service to the device
1270 scp->id must be set!
1271 return: 0 if OK, else error code
1273 static int auerswald_addservice (pauerswald_t cp, pauerscon_t scp)
1277 /* is the device available? */
1279 dbg ("usbdev == NULL");
1280 return -EIO; /*no: can not add a service, sorry*/
1283 /* is the service available? */
1284 if (cp->services[scp->id]) {
1285 dbg ("service is busy");
1289 /* device is available, service is free */
1290 cp->services[scp->id] = scp;
1292 /* register service in device */
1293 ret = auerchain_control_msg(
1294 &cp->controlchain, /* pointer to control chain */
1295 cp->usbdev, /* pointer to device */
1296 usb_sndctrlpipe (cp->usbdev, 0), /* pipe to control endpoint */
1297 AUV_CHANNELCTL, /* USB message request value */
1298 AUT_WREQ, /* USB message request type value */
1299 0x01, /* open USB message value */
1300 scp->id, /* USB message index value */
1301 NULL, /* pointer to the data to send */
1302 0, /* length in bytes of the data to send */
1303 HZ * 2); /* time to wait for the message to complete before timing out */
1305 dbg ("auerswald_addservice: auerchain_control_msg returned error code %d", ret);
1306 /* undo above actions */
1307 cp->services[scp->id] = NULL;
1311 dbg ("auerswald_addservice: channel open OK");
1316 /* remove a service from the the device
1317 scp->id must be set! */
1318 static void auerswald_removeservice (pauerswald_t cp, pauerscon_t scp)
1320 dbg ("auerswald_removeservice called");
1322 /* check if we have a service allocated */
1323 if (scp->id == AUH_UNASSIGNED)
1326 /* If there is a device: close the channel */
1328 /* Close the service channel inside the device */
1329 int ret = auerchain_control_msg(
1330 &cp->controlchain, /* pointer to control chain */
1331 cp->usbdev, /* pointer to device */
1332 usb_sndctrlpipe (cp->usbdev, 0), /* pipe to control endpoint */
1333 AUV_CHANNELCTL, /* USB message request value */
1334 AUT_WREQ, /* USB message request type value */
1335 0x00, // close /* USB message value */
1336 scp->id, /* USB message index value */
1337 NULL, /* pointer to the data to send */
1338 0, /* length in bytes of the data to send */
1339 HZ * 2); /* time to wait for the message to complete before timing out */
1341 dbg ("auerswald_removeservice: auerchain_control_msg returned error code %d", ret);
1344 dbg ("auerswald_removeservice: channel close OK");
1348 /* remove the service from the device */
1349 cp->services[scp->id] = NULL;
1350 scp->id = AUH_UNASSIGNED;
1354 /* --------------------------------------------------------------------- */
1355 /* Char device functions */
1357 /* Open a new character device */
1358 static int auerchar_open (struct inode *inode, struct file *file)
1360 int dtindex = iminor(inode);
1361 pauerswald_t cp = NULL;
1362 pauerchar_t ccp = NULL;
1363 struct usb_interface *intf;
1366 /* minor number in range? */
1370 intf = usb_find_interface(&auerswald_driver, dtindex);
1375 /* usb device available? */
1376 cp = usb_get_intfdata (intf);
1380 if (down_interruptible (&cp->mutex)) {
1381 return -ERESTARTSYS;
1384 /* we have access to the device. Now lets allocate memory */
1385 ccp = (pauerchar_t) kmalloc(sizeof(auerchar_t), GFP_KERNEL);
1387 err ("out of memory");
1392 /* Initialize device descriptor */
1393 memset( ccp, 0, sizeof(auerchar_t));
1394 init_MUTEX( &ccp->mutex);
1395 init_MUTEX( &ccp->readmutex);
1396 auerbuf_init (&ccp->bufctl);
1397 ccp->scontext.id = AUH_UNASSIGNED;
1398 ccp->scontext.dispatch = auerchar_ctrlread_dispatch;
1399 ccp->scontext.disconnect = auerchar_disconnect;
1400 init_waitqueue_head (&ccp->readwait);
1402 ret = auerbuf_setup (&ccp->bufctl, AU_RBUFFERS, cp->maxControlLength+AUH_SIZE);
1409 dbg("open %s as /dev/%s", cp->dev_desc, cp->name);
1414 file->private_data = ccp;
1415 return nonseekable_open(inode, file);
1418 ofail: up (&cp->mutex);
1419 auerchar_delete (ccp);
1424 /* IOCTL functions */
1425 static int auerchar_ioctl (struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
1427 pauerchar_t ccp = (pauerchar_t) file->private_data;
1429 audevinfo_t devinfo;
1430 pauerswald_t cp = NULL;
1432 unsigned int __user *user_arg = (unsigned int __user *)arg;
1436 /* get the mutexes */
1437 if (down_interruptible (&ccp->mutex)) {
1438 return -ERESTARTSYS;
1445 if (down_interruptible (&cp->mutex)) {
1447 return -ERESTARTSYS;
1450 /* Check for removal */
1459 /* return != 0 if Transmitt channel ready to send */
1460 case IOCTL_AU_TXREADY:
1461 dbg ("IOCTL_AU_TXREADY");
1463 && (ccp->scontext.id != AUH_UNASSIGNED)
1464 && !list_empty (&cp->bufctl.free_buff_list);
1465 ret = put_user (u, user_arg);
1468 /* return != 0 if connected to a service channel */
1469 case IOCTL_AU_CONNECT:
1470 dbg ("IOCTL_AU_CONNECT");
1471 u = (ccp->scontext.id != AUH_UNASSIGNED);
1472 ret = put_user (u, user_arg);
1475 /* return != 0 if Receive Data available */
1476 case IOCTL_AU_RXAVAIL:
1477 dbg ("IOCTL_AU_RXAVAIL");
1478 if (ccp->scontext.id == AUH_UNASSIGNED) {
1482 u = 0; /* no data */
1484 int restlen = ccp->readbuf->len - ccp->readoffset;
1489 if (!list_empty (&ccp->bufctl.rec_buff_list)) {
1493 ret = put_user (u, user_arg);
1496 /* return the max. buffer length for the device */
1497 case IOCTL_AU_BUFLEN:
1498 dbg ("IOCTL_AU_BUFLEN");
1499 u = cp->maxControlLength;
1500 ret = put_user (u, user_arg);
1503 /* requesting a service channel */
1504 case IOCTL_AU_SERVREQ:
1505 dbg ("IOCTL_AU_SERVREQ");
1506 /* requesting a service means: release the previous one first */
1507 auerswald_removeservice (cp, &ccp->scontext);
1508 /* get the channel number */
1509 ret = get_user (u, user_arg);
1513 if ((u < AUH_FIRSTUSERCH) || (u >= AUH_TYPESIZE)) {
1517 dbg ("auerchar service request parameters are ok");
1518 ccp->scontext.id = u;
1520 /* request the service now */
1521 ret = auerswald_addservice (cp, &ccp->scontext);
1523 /* no: revert service entry */
1524 ccp->scontext.id = AUH_UNASSIGNED;
1528 /* get a string descriptor for the device */
1529 case IOCTL_AU_DEVINFO:
1530 dbg ("IOCTL_AU_DEVINFO");
1531 if (copy_from_user (&devinfo, (void __user *) arg, sizeof (audevinfo_t))) {
1535 u = strlen(cp->dev_desc)+1;
1536 if (u > devinfo.bsize) {
1539 ret = copy_to_user(devinfo.buf, cp->dev_desc, u) ? -EFAULT : 0;
1542 /* get the max. string descriptor length */
1544 dbg ("IOCTL_AU_SLEN");
1546 ret = put_user (u, user_arg);
1550 dbg ("IOCTL_AU_UNKNOWN");
1554 /* release the mutexes */
1560 /* Read data from the device */
1561 static ssize_t auerchar_read (struct file *file, char __user *buf, size_t count, loff_t * ppos)
1563 unsigned long flags;
1564 pauerchar_t ccp = (pauerchar_t) file->private_data;
1565 pauerbuf_t bp = NULL;
1568 dbg ("auerchar_read");
1570 /* Error checking */
1579 if (down_interruptible (&ccp->mutex))
1580 return -ERESTARTSYS;
1582 /* Can we expect to read something? */
1583 if (ccp->scontext.id == AUH_UNASSIGNED) {
1588 /* only one reader per device allowed */
1589 if (down_interruptible (&ccp->readmutex)) {
1591 return -ERESTARTSYS;
1594 /* read data from readbuf, if available */
1598 /* read the maximum bytes */
1599 int restlen = bp->len - ccp->readoffset;
1602 if (count > restlen)
1605 if (copy_to_user (buf, bp->bufp+ccp->readoffset, count)) {
1606 dbg ("auerswald_read: copy_to_user failed");
1607 up (&ccp->readmutex);
1612 /* advance the read offset */
1613 ccp->readoffset += count;
1615 // reuse the read buffer
1617 auerbuf_releasebuf (bp);
1618 ccp->readbuf = NULL;
1620 /* return with number of bytes read */
1622 up (&ccp->readmutex);
1628 /* a read buffer is not available. Try to get the next data block. */
1630 /* Preparing for sleep */
1631 init_waitqueue_entry (&wait, current);
1632 set_current_state (TASK_INTERRUPTIBLE);
1633 add_wait_queue (&ccp->readwait, &wait);
1636 spin_lock_irqsave (&ccp->bufctl.lock, flags);
1637 if (!list_empty (&ccp->bufctl.rec_buff_list)) {
1638 /* yes: get the entry */
1639 struct list_head *tmp = ccp->bufctl.rec_buff_list.next;
1641 bp = list_entry (tmp, auerbuf_t, buff_list);
1643 spin_unlock_irqrestore (&ccp->bufctl.lock, flags);
1645 /* have we got data? */
1648 ccp->readoffset = AUH_SIZE; /* for headerbyte */
1649 set_current_state (TASK_RUNNING);
1650 remove_wait_queue (&ccp->readwait, &wait);
1651 goto doreadbuf; /* now we can read! */
1654 /* no data available. Should we wait? */
1655 if (file->f_flags & O_NONBLOCK) {
1656 dbg ("No read buffer available, returning -EAGAIN");
1657 set_current_state (TASK_RUNNING);
1658 remove_wait_queue (&ccp->readwait, &wait);
1659 up (&ccp->readmutex);
1661 return -EAGAIN; /* nonblocking, no data available */
1664 /* yes, we should wait! */
1665 up (&ccp->mutex); /* allow other operations while we wait */
1667 remove_wait_queue (&ccp->readwait, &wait);
1668 if (signal_pending (current)) {
1669 /* waked up by a signal */
1670 up (&ccp->readmutex);
1671 return -ERESTARTSYS;
1674 /* Anything left to read? */
1675 if ((ccp->scontext.id == AUH_UNASSIGNED) || ccp->removed) {
1676 up (&ccp->readmutex);
1680 if (down_interruptible (&ccp->mutex)) {
1681 up (&ccp->readmutex);
1682 return -ERESTARTSYS;
1685 /* try to read the incoming data again */
1690 /* Write a data block into the right service channel of the device */
1691 static ssize_t auerchar_write (struct file *file, const char __user *buf, size_t len, loff_t *ppos)
1693 pauerchar_t ccp = (pauerchar_t) file->private_data;
1694 pauerswald_t cp = NULL;
1696 unsigned long flags;
1700 dbg ("auerchar_write %d bytes", len);
1702 /* Error checking */
1712 if (down_interruptible (&ccp->mutex))
1713 return -ERESTARTSYS;
1715 /* Can we expect to write something? */
1716 if (ccp->scontext.id == AUH_UNASSIGNED) {
1724 return -ERESTARTSYS;
1726 if (down_interruptible (&cp->mutex)) {
1728 return -ERESTARTSYS;
1735 /* Prepare for sleep */
1736 init_waitqueue_entry (&wait, current);
1737 set_current_state (TASK_INTERRUPTIBLE);
1738 add_wait_queue (&cp->bufferwait, &wait);
1740 /* Try to get a buffer from the device pool.
1741 We can't use a buffer from ccp->bufctl because the write
1742 command will last beond a release() */
1744 spin_lock_irqsave (&cp->bufctl.lock, flags);
1745 if (!list_empty (&cp->bufctl.free_buff_list)) {
1746 /* yes: get the entry */
1747 struct list_head *tmp = cp->bufctl.free_buff_list.next;
1749 bp = list_entry (tmp, auerbuf_t, buff_list);
1751 spin_unlock_irqrestore (&cp->bufctl.lock, flags);
1753 /* are there any buffers left? */
1758 /* NONBLOCK: don't wait */
1759 if (file->f_flags & O_NONBLOCK) {
1760 set_current_state (TASK_RUNNING);
1761 remove_wait_queue (&cp->bufferwait, &wait);
1765 /* BLOCKING: wait */
1767 remove_wait_queue (&cp->bufferwait, &wait);
1768 if (signal_pending (current)) {
1769 /* waked up by a signal */
1770 return -ERESTARTSYS;
1774 set_current_state (TASK_RUNNING);
1775 remove_wait_queue (&cp->bufferwait, &wait);
1778 /* protect against too big write requests */
1779 if (len > cp->maxControlLength)
1780 len = cp->maxControlLength;
1782 /* Fill the buffer */
1783 if (copy_from_user ( bp->bufp+AUH_SIZE, buf, len)) {
1784 dbg ("copy_from_user failed");
1785 auerbuf_releasebuf (bp);
1786 /* Wake up all processes waiting for a buffer */
1787 wake_up (&cp->bufferwait);
1793 /* set the header byte */
1794 *(bp->bufp) = ccp->scontext.id | AUH_DIRECT | AUH_UNSPLIT;
1796 /* Set the transfer Parameters */
1797 bp->len = len+AUH_SIZE;
1798 bp->dr->bRequestType = AUT_WREQ;
1799 bp->dr->bRequest = AUV_WBLOCK;
1800 bp->dr->wValue = cpu_to_le16 (0);
1801 bp->dr->wIndex = cpu_to_le16 (ccp->scontext.id | AUH_DIRECT | AUH_UNSPLIT);
1802 bp->dr->wLength = cpu_to_le16 (len+AUH_SIZE);
1803 usb_fill_control_urb (bp->urbp, cp->usbdev, usb_sndctrlpipe (cp->usbdev, 0),
1804 (unsigned char*)bp->dr, bp->bufp, len+AUH_SIZE,
1805 auerchar_ctrlwrite_complete, bp);
1807 ret = auerchain_submit_urb (&cp->controlchain, bp->urbp);
1810 dbg ("auerchar_write: nonzero result of auerchain_submit_urb %d", ret);
1811 auerbuf_releasebuf (bp);
1812 /* Wake up all processes waiting for a buffer */
1813 wake_up (&cp->bufferwait);
1818 dbg ("auerchar_write: Write OK");
1825 /* Close a character device */
1826 static int auerchar_release (struct inode *inode, struct file *file)
1828 pauerchar_t ccp = (pauerchar_t) file->private_data;
1832 /* get the mutexes */
1833 if (down_interruptible (&ccp->mutex)) {
1834 return -ERESTARTSYS;
1838 if (down_interruptible (&cp->mutex)) {
1840 return -ERESTARTSYS;
1842 /* remove an open service */
1843 auerswald_removeservice (cp, &ccp->scontext);
1844 /* detach from device */
1845 if ((--cp->open_count <= 0) && (cp->usbdev == NULL)) {
1846 /* usb device waits for removal */
1848 auerswald_delete (cp);
1853 ccp->auerdev = NULL;
1856 auerchar_delete (ccp);
1862 /*----------------------------------------------------------------------*/
1863 /* File operation structure */
1864 static struct file_operations auerswald_fops =
1866 .owner = THIS_MODULE,
1867 .llseek = no_llseek,
1868 .read = auerchar_read,
1869 .write = auerchar_write,
1870 .ioctl = auerchar_ioctl,
1871 .open = auerchar_open,
1872 .release = auerchar_release,
1875 static struct usb_class_driver auerswald_class = {
1877 .fops = &auerswald_fops,
1878 .minor_base = AUER_MINOR_BASE,
1882 /* --------------------------------------------------------------------- */
1883 /* Special USB driver functions */
1885 /* Probe if this driver wants to serve an USB device
1887 This entry point is called whenever a new device is attached to the bus.
1888 Then the device driver has to create a new instance of its internal data
1889 structures for the new device.
1891 The dev argument specifies the device context, which contains pointers
1892 to all USB descriptors. The interface argument specifies the interface
1893 number. If a USB driver wants to bind itself to a particular device and
1894 interface it has to return a pointer. This pointer normally references
1895 the device driver's context structure.
1897 Probing normally is done by checking the vendor and product identifications
1898 or the class and subclass definitions. If they match the interface number
1899 is compared with the ones supported by the driver. When probing is done
1900 class based it might be necessary to parse some more USB descriptors because
1901 the device properties can differ in a wide range.
1903 static int auerswald_probe (struct usb_interface *intf,
1904 const struct usb_device_id *id)
1906 struct usb_device *usbdev = interface_to_usbdev(intf);
1907 pauerswald_t cp = NULL;
1912 dbg ("probe: vendor id 0x%x, device id 0x%x",
1913 le16_to_cpu(usbdev->descriptor.idVendor),
1914 le16_to_cpu(usbdev->descriptor.idProduct));
1916 /* we use only the first -and only- interface */
1917 if (intf->altsetting->desc.bInterfaceNumber != 0)
1920 /* allocate memory for our device and initialize it */
1921 cp = kmalloc (sizeof(auerswald_t), GFP_KERNEL);
1923 err ("out of memory");
1927 /* Initialize device descriptor */
1928 memset (cp, 0, sizeof(auerswald_t));
1929 init_MUTEX (&cp->mutex);
1930 cp->usbdev = usbdev;
1931 auerchain_init (&cp->controlchain);
1932 auerbuf_init (&cp->bufctl);
1933 init_waitqueue_head (&cp->bufferwait);
1935 ret = usb_register_dev(intf, &auerswald_class);
1937 err ("Not able to get a minor for this device.");
1941 /* Give the device a name */
1942 sprintf (cp->name, "usb/auer%d", intf->minor);
1944 /* Store the index */
1945 cp->dtindex = intf->minor;
1947 /* Get the usb version of the device */
1948 cp->version = le16_to_cpu(cp->usbdev->descriptor.bcdDevice);
1949 dbg ("Version is %X", cp->version);
1951 /* allow some time to settle the device */
1954 /* Try to get a suitable textual description of the device */
1956 ret = usb_string( cp->usbdev, AUSI_DEVICE, cp->dev_desc, AUSI_DLEN-1);
1959 /* Append Serial Number */
1960 memcpy(&cp->dev_desc[u], ",Ser# ", 6);
1962 ret = usb_string( cp->usbdev, AUSI_SERIALNR, &cp->dev_desc[u], AUSI_DLEN-u-1);
1965 /* Append subscriber number */
1966 memcpy(&cp->dev_desc[u], ", ", 2);
1968 ret = usb_string( cp->usbdev, AUSI_MSN, &cp->dev_desc[u], AUSI_DLEN-u-1);
1974 cp->dev_desc[u] = '\0';
1975 info("device is a %s", cp->dev_desc);
1977 /* get the maximum allowed control transfer length */
1978 pbuf = (__le16 *) kmalloc (2, GFP_KERNEL); /* use an allocated buffer because of urb target */
1980 err( "out of memory");
1983 ret = usb_control_msg(cp->usbdev, /* pointer to device */
1984 usb_rcvctrlpipe( cp->usbdev, 0 ), /* pipe to control endpoint */
1985 AUV_GETINFO, /* USB message request value */
1986 AUT_RREQ, /* USB message request type value */
1987 0, /* USB message value */
1988 AUDI_MBCTRANS, /* USB message index value */
1989 pbuf, /* pointer to the receive buffer */
1990 2, /* length of the buffer */
1991 2000); /* time to wait for the message to complete before timing out */
1993 cp->maxControlLength = le16_to_cpup(pbuf);
1995 dbg("setup: max. allowed control transfersize is %d bytes", cp->maxControlLength);
1998 err("setup: getting max. allowed control transfer length failed with error %d", ret);
2002 /* allocate a chain for the control messages */
2003 if (auerchain_setup (&cp->controlchain, AUCH_ELEMENTS)) {
2004 err ("out of memory");
2008 /* allocate buffers for control messages */
2009 if (auerbuf_setup (&cp->bufctl, AU_RBUFFERS, cp->maxControlLength+AUH_SIZE)) {
2010 err ("out of memory");
2014 /* start the interrupt endpoint */
2015 if (auerswald_int_open (cp)) {
2016 err ("int endpoint failed");
2021 usb_set_intfdata (intf, cp);
2024 /* Error exit: clean up the memory */
2025 pfail: auerswald_delete (cp);
2030 /* Disconnect driver from a served device
2032 This function is called whenever a device which was served by this driver
2035 The argument dev specifies the device context and the driver_context
2036 returns a pointer to the previously registered driver_context of the
2037 probe function. After returning from the disconnect function the USB
2038 framework completely deallocates all data structures associated with
2039 this device. So especially the usb_device structure must not be used
2040 any longer by the usb driver.
2042 static void auerswald_disconnect (struct usb_interface *intf)
2044 pauerswald_t cp = usb_get_intfdata (intf);
2047 usb_set_intfdata (intf, NULL);
2052 info ("device /dev/%s now disconnecting", cp->name);
2054 /* give back our USB minor number */
2055 usb_deregister_dev(intf, &auerswald_class);
2057 /* Stop the interrupt endpoint */
2058 auerswald_int_release (cp);
2060 /* remove the control chain allocated in auerswald_probe
2061 This has the benefit of
2062 a) all pending (a)synchronous urbs are unlinked
2063 b) all buffers dealing with urbs are reclaimed
2065 auerchain_free (&cp->controlchain);
2067 if (cp->open_count == 0) {
2068 /* nobody is using this device. So we can clean up now */
2069 up (&cp->mutex);/* up() is possible here because no other task
2070 can open the device (see above). I don't want
2071 to kfree() a locked mutex. */
2072 auerswald_delete (cp);
2074 /* device is used. Remove the pointer to the
2075 usb device (it's not valid any more). The last
2076 release() will do the clean up */
2079 /* Terminate waiting writers */
2080 wake_up (&cp->bufferwait);
2081 /* Inform all waiting readers */
2082 for ( u = 0; u < AUH_TYPESIZE; u++) {
2083 pauerscon_t scp = cp->services[u];
2085 scp->disconnect( scp);
2090 /* Descriptor for the devices which are served by this driver.
2091 NOTE: this struct is parsed by the usbmanager install scripts.
2092 Don't change without caution!
2094 static struct usb_device_id auerswald_ids [] = {
2095 { USB_DEVICE (ID_AUERSWALD, 0x00C0) }, /* COMpact 2104 USB */
2096 { USB_DEVICE (ID_AUERSWALD, 0x00DB) }, /* COMpact 4410/2206 USB */
2097 { USB_DEVICE (ID_AUERSWALD, 0x00F1) }, /* Comfort 2000 System Telephone */
2098 { USB_DEVICE (ID_AUERSWALD, 0x00F2) }, /* Comfort 1200 System Telephone */
2099 { } /* Terminating entry */
2102 /* Standard module device table */
2103 MODULE_DEVICE_TABLE (usb, auerswald_ids);
2105 /* Standard usb driver struct */
2106 static struct usb_driver auerswald_driver = {
2107 .owner = THIS_MODULE,
2108 .name = "auerswald",
2109 .probe = auerswald_probe,
2110 .disconnect = auerswald_disconnect,
2111 .id_table = auerswald_ids,
2115 /* --------------------------------------------------------------------- */
2116 /* Module loading/unloading */
2118 /* Driver initialisation. Called after module loading.
2119 NOTE: there is no concurrency at _init
2121 static int __init auerswald_init (void)
2126 /* register driver at the USB subsystem */
2127 result = usb_register (&auerswald_driver);
2129 err ("driver could not be registered");
2135 /* Driver deinit. Called before module removal.
2136 NOTE: there is no concurrency at _cleanup
2138 static void __exit auerswald_cleanup (void)
2141 usb_deregister (&auerswald_driver);
2144 /* --------------------------------------------------------------------- */
2145 /* Linux device driver module description */
2147 MODULE_AUTHOR (DRIVER_AUTHOR);
2148 MODULE_DESCRIPTION (DRIVER_DESC);
2149 MODULE_LICENSE ("GPL");
2151 module_init (auerswald_init);
2152 module_exit (auerswald_cleanup);
2154 /* --------------------------------------------------------------------- */