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Comment:some fixes to usb.sls guardians
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SHA1: 97a1a5b4fb091aeb8a6cba10d62ad2b5a6cc65ab
User & Date: ovenpasta@pizzahack.eu 2016-07-08 18:14:49
Context
2016-07-08
18:31
now load-shared-object is automatic check-in: 8f143abc67 user: ovenpasta@pizzahack.eu tags: trunk
18:14
some fixes to usb.sls guardians check-in: 97a1a5b4fb user: ovenpasta@pizzahack.eu tags: trunk
17:14
added more funcs to usb.sls check-in: 35917dddc4 user: ovenpasta@pizzahack.eu tags: trunk
Changes
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Changes to usb.sls. 

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#!chezscheme
(library 
 (usb)
 (export 
  usb-device-descriptor
  usb-device
  usb-device-handle

  usb-init
  usb-exit
................................................................................
       [device unsigned-16]
       [manufacturer unsigned-8]
       [product-index unsigned-8]
       [serial-number-index unsigned-8]
       [num-configurations unsigned-8]
     ))

 (define-record-type usb-device
   (fields
    (mutable ptr)))
 (define-record-type usb-device-handle
   (fields
    (mutable ptr)))







 (define (usb-device-addr dev)
   (ftype-pointer-address (usb-device-ptr dev)))

 (define (usb-device-handle-addr dev)
   (ftype-pointer-address (usb-device-handle-ptr dev)))

 (define usb-guardian (make-guardian))
 (define (usb-free-garbage)
   (let loop ([p (usb-guardian)])
     (when p
       (when (ftype-pointer? p)
	 ;(printf "freeing memory at ~x\n" p)








	 (foreign-free (ftype-pointer-address p)))
       (loop (usb-guardian)))))
   
 (define (usb-get-device-list)
   (usb-free-garbage)
   (let* ([ptr (make-ftype-pointer usb-device*** (foreign-alloc (ftype-sizeof usb-device***)))]
	  [f (foreign-procedure "libusb_get_device_list" (void* void*) int)]
	  [%g (usb-guardian ptr)]
	  [e (f 0 (ftype-pointer-address ptr))])
     (if (< e 0)
	 (error 'usb-get-device-list "error" e))
     (let ((devices (ftype-&ref usb-device*** (*) ptr)))

       (let loop ((i 0) (l '()))
	 (if (>= i e) l
	     (loop (fx+ i 1) 



		   (cons (make-usb-device (make-ftype-pointer usb-device* (ftype-ref usb-device*-array (i) devices))) l)))))))

 (define (usb-get-device-descriptor dev)
   (usb-free-garbage)
   (let* ([ptr (make-ftype-pointer usb-device-descriptor 
				   (foreign-alloc (ftype-sizeof usb-device-descriptor)))]
	  [%g (usb-guardian ptr)]
	  [f (foreign-procedure "libusb_get_device_descriptor" (void* void*) int)]
................................................................................
     #t))

 (define usb-log-level-enum (make-enumeration '(none error warning info debug)))
 (define usb-log-level-index (enum-set-indexer usb-log-level-enum))
 (define (usb-log-level-ref index)
   (list-ref (enum-set->list usb-log-level-enum) index))

 (define (usb-set-debug ctx level) 
   (let ([e ((foreign-procedure "libusb_set_debug" (void* int) int) 
	     0 
	     (usb-log-level-index level))])
     (when (< e 0)
       (error 'usb-exit "error" e))
     (void)))

 (define (usb-strerror code)
    ((foreign-procedure "libusb_strerror" (int) string) code))
................................................................................
	  [e (f (usb-device-addr device) (ftype-pointer-address ptr))])
     (if (< e 0)
	 (error 'usb-open (usb-strerror e) e))
     (make-usb-device-handle (ftype-&ref usb-device-handle** (*) ptr))))
 
 (define-ftype int* (* int))
 (define (alloc-int*) 
   (define ptr (make-ftype-pointer int* (foreign-alloc (ftype-sizeof int*))))
   (usb-guardian ptr)
   ptr)
 
 (define (usb-control-transfer handle type request value index data timeout)
   (assert (and 'usb-control-transfer (usb-device-handle? handle)))
   (assert (and 'usb-control-transfer (number? type)))
   (assert (and 'usb-control-transfer (number? request)))
   (assert (and 'usb-control-transfer (number? value)))
   (assert (and 'usb-control-transfer (number? index)))



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#!chezscheme
(library (usb)

 (export 
  usb-device-descriptor
  usb-device
  usb-device-handle

  usb-init
  usb-exit
................................................................................
       [device unsigned-16]
       [manufacturer unsigned-8]
       [product-index unsigned-8]
       [serial-number-index unsigned-8]
       [num-configurations unsigned-8]
     ))

 (define-record-type (usb-device make-usb-device% usb-device?)
   (fields
    (mutable ptr)))
 (define-record-type usb-device-handle
   (fields
    (mutable ptr)))

 (define usb-guardian (make-guardian))

 (define (make-usb-device ptr)
   (usb-guardian ptr)
   (make-usb-device% ptr))

 (define (usb-device-addr dev)
   (ftype-pointer-address (usb-device-ptr dev)))

 (define (usb-device-handle-addr dev)
   (ftype-pointer-address (usb-device-handle-ptr dev)))


 (define (usb-free-garbage)
   (let loop ([p (usb-guardian)])
     (when p
       (when (ftype-pointer? p)
	 (printf "freeing memory at ~x\n" p)
	 (cond [(ftype-pointer? usb-device*-array p)
		; FIXME THIS HANGS IF ENABLED
		#;((foreign-procedure "libusb_free_device_list" (void* int) void)
		 (ftype-pointer-address p) 0)]
	       [(ftype-pointer? usb-device* p)
		((foreign-procedure "libusb_unref_device" (void*) void) 
		 (ftype-pointer-address p))]
	       [else
		(foreign-free (ftype-pointer-address p))]))
       (loop (usb-guardian)))))
   
 (define (usb-get-device-list)
   (usb-free-garbage)
   (let* ([ptr (make-ftype-pointer usb-device*** (foreign-alloc (ftype-sizeof usb-device***)))]
	  [f (foreign-procedure "libusb_get_device_list" (void* void*) int)]
	  [%g (usb-guardian ptr)]
	  [e (f 0 (ftype-pointer-address ptr))])
     (if (< e 0)
	 (error 'usb-get-device-list "error" e))
     (let ((devices (ftype-&ref usb-device*** (*) ptr)))
       (usb-guardian devices)
       (let loop ((i 0) (l '()))
	 (if (>= i e) l
	     (loop (fx+ i 1) 
		   (cons (make-usb-device 
			  (make-ftype-pointer 
			   usb-device* 
			   (ftype-ref usb-device*-array (i) devices))) l)))))))

 (define (usb-get-device-descriptor dev)
   (usb-free-garbage)
   (let* ([ptr (make-ftype-pointer usb-device-descriptor 
				   (foreign-alloc (ftype-sizeof usb-device-descriptor)))]
	  [%g (usb-guardian ptr)]
	  [f (foreign-procedure "libusb_get_device_descriptor" (void* void*) int)]
................................................................................
     #t))

 (define usb-log-level-enum (make-enumeration '(none error warning info debug)))
 (define usb-log-level-index (enum-set-indexer usb-log-level-enum))
 (define (usb-log-level-ref index)
   (list-ref (enum-set->list usb-log-level-enum) index))

 (define (usb-set-debug level) 
   (let ([e ((foreign-procedure "libusb_set_debug" (void* int) int) 
	     0 ; FIXME: ctx NULL, allow multiple contexts?
	     (usb-log-level-index level))])
     (when (< e 0)
       (error 'usb-exit "error" e))
     (void)))

 (define (usb-strerror code)
    ((foreign-procedure "libusb_strerror" (int) string) code))
................................................................................
	  [e (f (usb-device-addr device) (ftype-pointer-address ptr))])
     (if (< e 0)
	 (error 'usb-open (usb-strerror e) e))
     (make-usb-device-handle (ftype-&ref usb-device-handle** (*) ptr))))
 
 (define-ftype int* (* int))
 (define (alloc-int*) 
   (let ([ptr (make-ftype-pointer int* (foreign-alloc (ftype-sizeof int*)))])
     (usb-guardian ptr)
     ptr))
 
 (define (usb-control-transfer handle type request value index data timeout)
   (assert (and 'usb-control-transfer (usb-device-handle? handle)))
   (assert (and 'usb-control-transfer (number? type)))
   (assert (and 'usb-control-transfer (number? request)))
   (assert (and 'usb-control-transfer (number? value)))
   (assert (and 'usb-control-transfer (number? index)))

Fossil 2.9 [0fd79a3e09] 2019-07-13 13:05:19