drivers/usb/usbip/vudc.h

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2015 Karol Kosik <karo9@interia.eu>
   4  * Copyright (C) 2015-2016 Samsung Electronics
   5  *               Igor Kotrasinski <i.kotrasinsk@samsung.com>
   6  *               Krzysztof Opasiak <k.opasiak@samsung.com>
   7  */
   8
   9 #ifndef __USBIP_VUDC_H
  10 #define __USBIP_VUDC_H
  11
  12 #include <linux/platform_device.h>
  13 #include <linux/usb.h>
  14 #include <linux/usb/gadget.h>
  15 #include <linux/usb/ch9.h>
  16 #include <linux/list.h>
  17 #include <linux/timer.h>
  18 #include <linux/time.h>
  19 #include <linux/sysfs.h>
  20
  21 #include "usbip_common.h"
  22
  23 #define GADGET_NAME "usbip-vudc"
  24
  25 struct vep {
  26         struct usb_ep ep;
  27         unsigned type:2; /* type, as USB_ENDPOINT_XFER_* */
  28         char name[8];   /* space for ep name */
  29
  30         const struct usb_endpoint_descriptor *desc;
  31         struct usb_gadget *gadget;
  32         struct list_head req_queue; /* Request queue */
  33         unsigned halted:1;
  34         unsigned wedged:1;
  35         unsigned already_seen:1;
  36         unsigned setup_stage:1;
  37 };
  38
  39 struct vrequest {
  40         struct usb_request req;
  41         struct vudc *udc;
  42         struct list_head req_entry; /* Request queue */
  43 };
  44
  45 struct urbp {
  46         struct urb *urb;
  47         struct vep *ep;
  48         struct list_head urb_entry; /* urb queue */
  49         unsigned long seqnum;
  50         unsigned type:2; /* for tx, since ep type can change after */
  51         unsigned new:1;
  52 };
  53
  54 struct v_unlink {
  55         unsigned long seqnum;
  56         __u32 status;
  57 };
  58
  59 enum tx_type {
  60         TX_UNLINK,
  61         TX_SUBMIT,
  62 };
  63
  64 struct tx_item {
  65         struct list_head tx_entry;
  66         enum tx_type type;
  67         union {
  68                 struct urbp *s;
  69                 struct v_unlink *u;
  70         };
  71 };
  72
  73 enum tr_state {
  74         VUDC_TR_RUNNING,
  75         VUDC_TR_IDLE,
  76         VUDC_TR_STOPPED,
  77 };
  78
  79 struct transfer_timer {
  80         struct timer_list timer;
  81         enum tr_state state;
  82         unsigned long frame_start;
  83         int frame_limit;
  84 };
  85
  86 struct vudc {
  87         struct usb_gadget gadget;
  88         struct usb_gadget_driver *driver;
  89         struct platform_device *pdev;
  90
  91         struct usb_device_descriptor dev_desc;
  92
  93         struct usbip_device ud;
  94         struct transfer_timer tr_timer;
  95         struct timespec64 start_time;
  96
  97         struct list_head urb_queue;
  98
  99         spinlock_t lock_tx;
 100         struct list_head tx_queue;
 101         wait_queue_head_t tx_waitq;
 102
 103         spinlock_t lock;
 104         struct vep *ep;
 105         int address;
 106         u16 devstatus;
 107
 108         unsigned pullup:1;
 109         unsigned connected:1;
 110         unsigned desc_cached:1;
 111 };
 112
 113 struct vudc_device {
 114         struct platform_device *pdev;
 115         struct list_head dev_entry;
 116 };
 117
 118 extern const struct attribute_group vudc_attr_group;
 119
 120 /* visible everywhere */
 121
 122 static inline struct vep *to_vep(struct usb_ep *_ep)
 123 {
 124         return container_of(_ep, struct vep, ep);
 125 }
 126
 127 static inline struct vrequest *to_vrequest(
 128         struct usb_request *_req)
 129 {
 130         return container_of(_req, struct vrequest, req);
 131 }
 132
 133 static inline struct vudc *usb_gadget_to_vudc(
 134         struct usb_gadget *_gadget)
 135 {
 136         return container_of(_gadget, struct vudc, gadget);
 137 }
 138
 139 static inline struct vudc *ep_to_vudc(struct vep *ep)
 140 {
 141         return container_of(ep->gadget, struct vudc, gadget);
 142 }
 143
 144 /* vudc_sysfs.c */
 145
 146 int get_gadget_descs(struct vudc *udc);
 147
 148 /* vudc_tx.c */
 149
 150 int v_tx_loop(void *data);
 151 void v_enqueue_ret_unlink(struct vudc *udc, __u32 seqnum, __u32 status);
 152 void v_enqueue_ret_submit(struct vudc *udc, struct urbp *urb_p);
 153
 154 /* vudc_rx.c */
 155
 156 int v_rx_loop(void *data);
 157
 158 /* vudc_transfer.c */
 159
 160 void v_init_timer(struct vudc *udc);
 161 void v_start_timer(struct vudc *udc);
 162 void v_kick_timer(struct vudc *udc, unsigned long time);
 163 void v_stop_timer(struct vudc *udc);
 164
 165 /* vudc_dev.c */
 166
 167 struct urbp *alloc_urbp(void);
 168 void free_urbp_and_urb(struct urbp *urb_p);
 169
 170 struct vep *vudc_find_endpoint(struct vudc *udc, u8 address);
 171
 172 struct vudc_device *alloc_vudc_device(int devid);
 173 void put_vudc_device(struct vudc_device *udc_dev);
 174
 175 int vudc_probe(struct platform_device *pdev);
 176 int vudc_remove(struct platform_device *pdev);
 177
 178 #endif /* __USBIP_VUDC_H */