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