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  * CMSPAR, some architectures can't have space and mark parity.
  12  */
  13
  14 #ifndef CMSPAR
  15 #define CMSPAR                  0
  16 #endif
  17
  18 /*
  19  * Major and minor numbers.
  20  */
  21
  22 #define ACM_TTY_MAJOR           166
  23 #define ACM_TTY_MINORS          256
  24
  25 /*
  26  * Requests.
  27  */
  28
  29 #define USB_RT_ACM              (USB_TYPE_CLASS | USB_RECIP_INTERFACE)
  30
  31 /*
  32  * Output control lines.
  33  */
  34
  35 #define ACM_CTRL_DTR            0x01
  36 #define ACM_CTRL_RTS            0x02
  37
  38 /*
  39  * Input control lines and line errors.
  40  */
  41
  42 #define ACM_CTRL_DCD            0x01
  43 #define ACM_CTRL_DSR            0x02
  44 #define ACM_CTRL_BRK            0x04
  45 #define ACM_CTRL_RI             0x08
  46
  47 #define ACM_CTRL_FRAMING        0x10
  48 #define ACM_CTRL_PARITY         0x20
  49 #define ACM_CTRL_OVERRUN        0x40
  50
  51 /*
  52  * Internal driver structures.
  53  */
  54
  55 /*
  56  * The only reason to have several buffers is to accommodate assumptions
  57  * in line disciplines. They ask for empty space amount, receive our URB size,
  58  * and proceed to issue several 1-character writes, assuming they will fit.
  59  * The very first write takes a complete URB. Fortunately, this only happens
  60  * when processing onlcr, so we only need 2 buffers. These values must be
  61  * powers of 2.
  62  */
  63 #define ACM_NW  16
  64 #define ACM_NR  16
  65
  66 struct acm_wb {
  67         u8 *buf;
  68         dma_addr_t dmah;
  69         unsigned int len;
  70         struct urb              *urb;
  71         struct acm              *instance;
  72         bool use;
  73 };
  74
  75 struct acm_rb {
  76         int                     size;
  77         unsigned char           *base;
  78         dma_addr_t              dma;
  79         int                     index;
  80         struct acm              *instance;
  81 };
  82
  83 struct acm {
  84         struct usb_device *dev;                         /* the corresponding usb device */
  85         struct usb_interface *control;                  /* control interface */
  86         struct usb_interface *data;                     /* data interface */
  87         unsigned in, out;                               /* i/o pipes */
  88         struct tty_port port;                           /* our tty port data */
  89         struct urb *ctrlurb;                            /* urbs */
  90         u8 *ctrl_buffer;                                /* buffers of urbs */
  91         dma_addr_t ctrl_dma;                            /* dma handles of buffers */
  92         u8 *country_codes;                              /* country codes from device */
  93         unsigned int country_code_size;                 /* size of this buffer */
  94         unsigned int country_rel_date;                  /* release date of version */
  95         struct acm_wb wb[ACM_NW];
  96         unsigned long read_urbs_free;
  97         struct urb *read_urbs[ACM_NR];
  98         struct acm_rb read_buffers[ACM_NR];
  99         int rx_buflimit;
 100         spinlock_t read_lock;
 101         u8 *notification_buffer;                        /* to reassemble fragmented notifications */
 102         unsigned int nb_index;
 103         unsigned int nb_size;
 104         int transmitting;
 105         spinlock_t write_lock;
 106         struct mutex mutex;
 107         bool disconnected;
 108         unsigned long flags;
 109 #               define EVENT_TTY_WAKEUP 0
 110 #               define EVENT_RX_STALL   1
 111 #               define ACM_THROTTLED    2
 112 #               define ACM_ERROR_DELAY  3
 113         unsigned long urbs_in_error_delay;              /* these need to be restarted after a delay */
 114         struct usb_cdc_line_coding line;                /* bits, stop, parity */
 115         struct delayed_work dwork;                      /* work queue entry for various purposes */
 116         unsigned int ctrlin;                            /* input control lines (DCD, DSR, RI, break, overruns) */
 117         unsigned int ctrlout;                           /* output control lines (DTR, RTS) */
 118         struct async_icount iocount;                    /* counters for control line changes */
 119         struct async_icount oldcount;                   /* for comparison of counter */
 120         wait_queue_head_t wioctl;                       /* for ioctl */
 121         unsigned int writesize;                         /* max packet size for the output bulk endpoint */
 122         unsigned int readsize,ctrlsize;                 /* buffer sizes for freeing */
 123         unsigned int minor;                             /* acm minor number */
 124         unsigned char clocal;                           /* termios CLOCAL */
 125         unsigned int ctrl_caps;                         /* control capabilities from the class specific header */
 126         unsigned int susp_count;                        /* number of suspended interfaces */
 127         unsigned int combined_interfaces:1;             /* control and data collapsed */
 128         u8 bInterval;
 129         struct usb_anchor delayed;                      /* writes queued for a device about to be woken */
 130         unsigned long quirks;
 131 };
 132
 133 /* constants describing various quirks and errors */
 134 #define NO_UNION_NORMAL                 BIT(0)
 135 #define SINGLE_RX_URB                   BIT(1)
 136 #define NO_CAP_LINE                     BIT(2)
 137 #define IGNORE_DEVICE                   BIT(3)
 138 #define QUIRK_CONTROL_LINE_STATE        BIT(4)
 139 #define CLEAR_HALT_CONDITIONS           BIT(5)
 140 #define SEND_ZERO_PACKET                BIT(6)
 141 #define DISABLE_ECHO                    BIT(7)