drivers/usb/class/cdc-acm.h

   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.
  60  */
  61 #define ACM_NWB  2
  62 struct acm_wb {
  63         unsigned char *buf;
  64         dma_addr_t dmah;
  65         int len;
  66         int use;
  67 };
  68
  69 struct acm {
  70         struct usb_device *dev;                         /* the corresponding usb device */
  71         struct usb_interface *control;                  /* control interface */
  72         struct usb_interface *data;                     /* data interface */
  73         struct tty_struct *tty;                         /* the corresponding tty */
  74         struct urb *ctrlurb, *readurb, *writeurb;       /* urbs */
  75         u8 *ctrl_buffer, *read_buffer;                  /* buffers of urbs */
  76         dma_addr_t ctrl_dma, read_dma;                  /* dma handles of buffers */
  77         struct acm_wb wb[ACM_NWB];
  78         int write_current;                              /* current write buffer */
  79         int write_used;                                 /* number of non-empty write buffers */
  80         int write_ready;                                /* write urb is not running */
  81         spinlock_t write_lock;
  82         struct usb_cdc_line_coding line;                /* bits, stop, parity */
  83         struct work_struct work;                        /* work queue entry for line discipline waking up */
  84         struct tasklet_struct bh;                       /* rx processing */
  85         spinlock_t throttle_lock;                       /* synchronize throtteling and read callback */
  86         unsigned int ctrlin;                            /* input control lines (DCD, DSR, RI, break, overruns) */
  87         unsigned int ctrlout;                           /* output control lines (DTR, RTS) */
  88         unsigned int writesize;                         /* max packet size for the output bulk endpoint */
  89         unsigned int readsize,ctrlsize;                 /* buffer sizes for freeing */
  90         unsigned int used;                              /* someone has this acm's device open */
  91         unsigned int minor;                             /* acm minor number */
  92         unsigned char throttle;                         /* throttled by tty layer */
  93         unsigned char clocal;                           /* termios CLOCAL */
  94         unsigned char resubmit_to_unthrottle;           /* throtteling has disabled the read urb */
  95         unsigned int ctrl_caps;                         /* control capabilities from the class specific header */
  96 };
  97
  98 #define CDC_DATA_INTERFACE_TYPE 0x0a
  99
 100 /* constants describing various quirks and errors */
 101 #define NO_UNION_NORMAL                 1