drivers/usb/musb/musb_gadget.h

   1 /*
   2  * MUSB OTG driver peripheral defines
   3  *
   4  * Copyright 2005 Mentor Graphics Corporation
   5  * Copyright (C) 2005-2006 by Texas Instruments
   6  * Copyright (C) 2006-2007 Nokia Corporation
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License
  10  * version 2 as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  20  * 02110-1301 USA
  21  *
  22  * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
  23  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  24  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
  25  * NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  27  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  28  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  29  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  31  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  *
  33  */
  34
  35 #ifndef __MUSB_GADGET_H
  36 #define __MUSB_GADGET_H
  37
  38 #include <linux/list.h>
  39
  40 enum buffer_map_state {
  41         UN_MAPPED = 0,
  42         PRE_MAPPED,
  43         MUSB_MAPPED
  44 };
  45
  46 struct musb_request {
  47         struct usb_request      request;
  48         struct list_head        list;
  49         struct musb_ep          *ep;
  50         struct musb             *musb;
  51         u8 tx;                  /* endpoint direction */
  52         u8 epnum;
  53         enum buffer_map_state map_state;
  54 };
  55
  56 static inline struct musb_request *to_musb_request(struct usb_request *req)
  57 {
  58         return req ? container_of(req, struct musb_request, request) : NULL;
  59 }
  60
  61 extern struct usb_request *
  62 musb_alloc_request(struct usb_ep *ep, gfp_t gfp_flags);
  63 extern void musb_free_request(struct usb_ep *ep, struct usb_request *req);
  64
  65
  66 /*
  67  * struct musb_ep - peripheral side view of endpoint rx or tx side
  68  */
  69 struct musb_ep {
  70         /* stuff towards the head is basically write-once. */
  71         struct usb_ep                   end_point;
  72         char                            name[12];
  73         struct musb_hw_ep               *hw_ep;
  74         struct musb                     *musb;
  75         u8                              current_epnum;
  76
  77         /* ... when enabled/disabled ... */
  78         u8                              type;
  79         u8                              is_in;
  80         u16                             packet_sz;
  81         const struct usb_endpoint_descriptor    *desc;
  82         struct dma_channel              *dma;
  83
  84         /* later things are modified based on usage */
  85         struct list_head                req_list;
  86
  87         u8                              wedged;
  88
  89         /* true if lock must be dropped but req_list may not be advanced */
  90         u8                              busy;
  91
  92         u8                              hb_mult;
  93 };
  94
  95 static inline struct musb_ep *to_musb_ep(struct usb_ep *ep)
  96 {
  97         return ep ? container_of(ep, struct musb_ep, end_point) : NULL;
  98 }
  99
 100 static inline struct musb_request *next_request(struct musb_ep *ep)
 101 {
 102         struct list_head        *queue = &ep->req_list;
 103
 104         if (list_empty(queue))
 105                 return NULL;
 106         return container_of(queue->next, struct musb_request, list);
 107 }
 108
 109 extern void musb_g_tx(struct musb *musb, u8 epnum);
 110 extern void musb_g_rx(struct musb *musb, u8 epnum);
 111
 112 extern const struct usb_ep_ops musb_g_ep0_ops;
 113
 114 extern int musb_gadget_setup(struct musb *);
 115 extern void musb_gadget_cleanup(struct musb *);
 116
 117 extern void musb_g_giveback(struct musb_ep *, struct usb_request *, int);
 118
 119 extern void musb_ep_restart(struct musb *, struct musb_request *);
 120
 121 #endif          /* __MUSB_GADGET_H */