linux/drivers/usb/class/cdc-acm.h
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   1/*
   2 *
   3 * Includes for cdc-acm.c
   4 *
   5 * Mainly take from usbnet's cdc-ether part
   6 *
   7 */
   8
   9/*
  10 * CMSPAR, some architectures can't have space and mark parity.
  11 */
  12
  13#ifndef CMSPAR
  14#define CMSPAR                  0
  15#endif
  16
  17/*
  18 * Major and minor numbers.
  19 */
  20
  21#define ACM_TTY_MAJOR           166
  22#define ACM_TTY_MINORS          32
  23
  24/*
  25 * Requests.
  26 */
  27
  28#define USB_RT_ACM              (USB_TYPE_CLASS | USB_RECIP_INTERFACE)
  29
  30/*
  31 * Output control lines.
  32 */
  33
  34#define ACM_CTRL_DTR            0x01
  35#define ACM_CTRL_RTS            0x02
  36
  37/*
  38 * Input control lines and line errors.
  39 */
  40
  41#define ACM_CTRL_DCD            0x01
  42#define ACM_CTRL_DSR            0x02
  43#define ACM_CTRL_BRK            0x04
  44#define ACM_CTRL_RI             0x08
  45
  46#define ACM_CTRL_FRAMING        0x10
  47#define ACM_CTRL_PARITY         0x20
  48#define ACM_CTRL_OVERRUN        0x40
  49
  50/*
  51 * Internal driver structures.
  52 */
  53
  54/*
  55 * The only reason to have several buffers is to accomodate assumptions
  56 * in line disciplines. They ask for empty space amount, receive our URB size,
  57 * and proceed to issue several 1-character writes, assuming they will fit.
  58 * The very first write takes a complete URB. Fortunately, this only happens
  59 * when processing onlcr, so we only need 2 buffers. These values must be
  60 * powers of 2.
  61 */
  62#define ACM_NW  16
  63#define ACM_NR  16
  64
  65struct acm_wb {
  66        unsigned char *buf;
  67        dma_addr_t dmah;
  68        int len;
  69        int use;
  70        struct urb              *urb;
  71        struct acm              *instance;
  72};
  73
  74struct acm_rb {
  75        struct list_head        list;
  76        int                     size;
  77        unsigned char           *base;
  78        dma_addr_t              dma;
  79};
  80
  81struct acm_ru {
  82        struct list_head        list;
  83        struct acm_rb           *buffer;
  84        struct urb              *urb;
  85        struct acm              *instance;
  86};
  87
  88struct acm {
  89        struct usb_device *dev;                         /* the corresponding usb device */
  90        struct usb_interface *control;                  /* control interface */
  91        struct usb_interface *data;                     /* data interface */
  92        struct tty_struct *tty;                         /* the corresponding tty */
  93        struct urb *ctrlurb;                    /* urbs */
  94        u8 *ctrl_buffer;                                /* buffers of urbs */
  95        dma_addr_t ctrl_dma;                            /* dma handles of buffers */
  96        u8 *country_codes;                              /* country codes from device */
  97        unsigned int country_code_size;                 /* size of this buffer */
  98        unsigned int country_rel_date;                  /* release date of version */
  99        struct acm_wb wb[ACM_NW];
 100        struct acm_ru ru[ACM_NR];
 101        struct acm_rb rb[ACM_NR];
 102        int rx_buflimit;
 103        int rx_endpoint;
 104        spinlock_t read_lock;
 105        struct list_head spare_read_urbs;
 106        struct list_head spare_read_bufs;
 107        struct list_head filled_read_bufs;
 108        int write_used;                                 /* number of non-empty write buffers */
 109        int processing;
 110        int transmitting;
 111        spinlock_t write_lock;
 112        struct mutex mutex;
 113        struct usb_cdc_line_coding line;                /* bits, stop, parity */
 114        struct work_struct work;                        /* work queue entry for line discipline waking up */
 115        struct work_struct waker;
 116        wait_queue_head_t drain_wait;                   /* close processing */
 117        struct tasklet_struct urb_task;                 /* rx processing */
 118        spinlock_t throttle_lock;                       /* synchronize throtteling and read callback */
 119        unsigned int ctrlin;                            /* input control lines (DCD, DSR, RI, break, overruns) */
 120        unsigned int ctrlout;                           /* output control lines (DTR, RTS) */
 121        unsigned int writesize;                         /* max packet size for the output bulk endpoint */
 122        unsigned int readsize,ctrlsize;                 /* buffer sizes for freeing */
 123        unsigned int used;                              /* someone has this acm's device open */
 124        unsigned int minor;                             /* acm minor number */
 125        unsigned char throttle;                         /* throttled by tty layer */
 126        unsigned char clocal;                           /* termios CLOCAL */
 127        unsigned int ctrl_caps;                         /* control capabilities from the class specific header */
 128        unsigned int susp_count;                        /* number of suspended interfaces */
 129        struct acm_wb *delayed_wb;                      /* write queued for a device about to be woken */
 130};
 131
 132#define CDC_DATA_INTERFACE_TYPE 0x0a
 133
 134/* constants describing various quirks and errors */
 135#define NO_UNION_NORMAL                 1
 136#define SINGLE_RX_URB                   2
 137
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