drivers/usb/class/cdc-acm.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  *
   4  * Includes for cdc-acm.c
   5  *
   6  * Mainly take from usbnet's cdc-ether part
   7  *
   8  */
   9
  10 /*
  11  * Major and minor numbers.
  12  */
  13
  14 #define ACM_TTY_MAJOR           166
  15 #define ACM_TTY_MINORS          256
  16
  17 #define ACM_MINOR_INVALID       ACM_TTY_MINORS
  18
  19 /*
  20  * Requests.
  21  */
  22
  23 #define USB_RT_ACM              (USB_TYPE_CLASS | USB_RECIP_INTERFACE)
  24
  25 /*
  26  * Internal driver structures.
  27  */
  28
  29 /*
  30  * The only reason to have several buffers is to accommodate assumptions
  31  * in line disciplines. They ask for empty space amount, receive our URB size,
  32  * and proceed to issue several 1-character writes, assuming they will fit.
  33  * The very first write takes a complete URB. Fortunately, this only happens
  34  * when processing onlcr, so we only need 2 buffers. These values must be
  35  * powers of 2.
  36  */
  37 #define ACM_NW  16
  38 #define ACM_NR  16
  39
  40 struct acm_wb {
  41         u8 *buf;
  42         dma_addr_t dmah;
  43         unsigned int len;
  44         struct urb              *urb;
  45         struct acm              *instance;
  46         bool use;
  47 };
  48
  49 struct acm_rb {
  50         int                     size;
  51         unsigned char           *base;
  52         dma_addr_t              dma;
  53         int                     index;
  54         struct acm              *instance;
  55 };
  56
  57 struct acm {
  58         struct usb_device *dev;                         /* the corresponding usb device */
  59         struct usb_interface *control;                  /* control interface */
  60         struct usb_interface *data;                     /* data interface */
  61         unsigned in, out;                               /* i/o pipes */
  62         struct tty_port port;                           /* our tty port data */
  63         struct urb *ctrlurb;                            /* urbs */
  64         u8 *ctrl_buffer;                                /* buffers of urbs */
  65         dma_addr_t ctrl_dma;                            /* dma handles of buffers */
  66         u8 *country_codes;                              /* country codes from device */
  67         unsigned int country_code_size;                 /* size of this buffer */
  68         unsigned int country_rel_date;                  /* release date of version */
  69         struct acm_wb wb[ACM_NW];
  70         unsigned long read_urbs_free;
  71         struct urb *read_urbs[ACM_NR];
  72         struct acm_rb read_buffers[ACM_NR];
  73         int rx_buflimit;
  74         spinlock_t read_lock;
  75         u8 *notification_buffer;                        /* to reassemble fragmented notifications */
  76         unsigned int nb_index;
  77         unsigned int nb_size;
  78         int transmitting;
  79         spinlock_t write_lock;
  80         struct mutex mutex;
  81         bool disconnected;
  82         unsigned long flags;
  83 #               define EVENT_TTY_WAKEUP 0
  84 #               define EVENT_RX_STALL   1
  85 #               define ACM_THROTTLED    2
  86 #               define ACM_ERROR_DELAY  3
  87         unsigned long urbs_in_error_delay;              /* these need to be restarted after a delay */
  88         struct usb_cdc_line_coding line;                /* bits, stop, parity */
  89         struct delayed_work dwork;                      /* work queue entry for various purposes */
  90         unsigned int ctrlin;                            /* input control lines (DCD, DSR, RI, break, overruns) */
  91         unsigned int ctrlout;                           /* output control lines (DTR, RTS) */
  92         struct async_icount iocount;                    /* counters for control line changes */
  93         struct async_icount oldcount;                   /* for comparison of counter */
  94         wait_queue_head_t wioctl;                       /* for ioctl */
  95         unsigned int writesize;                         /* max packet size for the output bulk endpoint */
  96         unsigned int readsize,ctrlsize;                 /* buffer sizes for freeing */
  97         unsigned int minor;                             /* acm minor number */
  98         unsigned char clocal;                           /* termios CLOCAL */
  99         unsigned int ctrl_caps;                         /* control capabilities from the class specific header */
 100         unsigned int susp_count;                        /* number of suspended interfaces */
 101         unsigned int combined_interfaces:1;             /* control and data collapsed */
 102         u8 bInterval;
 103         struct usb_anchor delayed;                      /* writes queued for a device about to be woken */
 104         unsigned long quirks;
 105 };
 106
 107 /* constants describing various quirks and errors */
 108 #define NO_UNION_NORMAL                 BIT(0)
 109 #define SINGLE_RX_URB                   BIT(1)
 110 #define NO_CAP_LINE                     BIT(2)
 111 #define IGNORE_DEVICE                   BIT(3)
 112 #define QUIRK_CONTROL_LINE_STATE        BIT(4)
 113 #define CLEAR_HALT_CONDITIONS           BIT(5)
 114 #define SEND_ZERO_PACKET                BIT(6)
 115 #define DISABLE_ECHO                    BIT(7)