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 * Output control lines. 27 */ 28 29 #define ACM_CTRL_DTR 0x01 30 #define ACM_CTRL_RTS 0x02 31 32 /* 33 * Input control lines and line errors. 34 */ 35 36 #define ACM_CTRL_DCD 0x01 37 #define ACM_CTRL_DSR 0x02 38 #define ACM_CTRL_BRK 0x04 39 #define ACM_CTRL_RI 0x08 40 41 #define ACM_CTRL_FRAMING 0x10 42 #define ACM_CTRL_PARITY 0x20 43 #define ACM_CTRL_OVERRUN 0x40 44 45 /* 46 * Internal driver structures. 47 */ 48 49 /* 50 * The only reason to have several buffers is to accommodate assumptions 51 * in line disciplines. They ask for empty space amount, receive our URB size, 52 * and proceed to issue several 1-character writes, assuming they will fit. 53 * The very first write takes a complete URB. Fortunately, this only happens 54 * when processing onlcr, so we only need 2 buffers. These values must be 55 * powers of 2. 56 */ 57 #define ACM_NW 16 58 #define ACM_NR 16 59 60 struct acm_wb { 61 u8 *buf; 62 dma_addr_t dmah; 63 unsigned int len; 64 struct urb *urb; 65 struct acm *instance; 66 bool use; 67 }; 68 69 struct acm_rb { 70 int size; 71 unsigned char *base; 72 dma_addr_t dma; 73 int index; 74 struct acm *instance; 75 }; 76 77 struct acm { 78 struct usb_device *dev; /* the corresponding usb device */ 79 struct usb_interface *control; /* control interface */ 80 struct usb_interface *data; /* data interface */ 81 unsigned in, out; /* i/o pipes */ 82 struct tty_port port; /* our tty port data */ 83 struct urb *ctrlurb; /* urbs */ 84 u8 *ctrl_buffer; /* buffers of urbs */ 85 dma_addr_t ctrl_dma; /* dma handles of buffers */ 86 u8 *country_codes; /* country codes from device */ 87 unsigned int country_code_size; /* size of this buffer */ 88 unsigned int country_rel_date; /* release date of version */ 89 struct acm_wb wb[ACM_NW]; 90 unsigned long read_urbs_free; 91 struct urb *read_urbs[ACM_NR]; 92 struct acm_rb read_buffers[ACM_NR]; 93 int rx_buflimit; 94 spinlock_t read_lock; 95 u8 *notification_buffer; /* to reassemble fragmented notifications */ 96 unsigned int nb_index; 97 unsigned int nb_size; 98 int transmitting; 99 spinlock_t write_lock; 100 struct mutex mutex; 101 bool disconnected; 102 unsigned long flags; 103 # define EVENT_TTY_WAKEUP 0 104 # define EVENT_RX_STALL 1 105 # define ACM_THROTTLED 2 106 # define ACM_ERROR_DELAY 3 107 unsigned long urbs_in_error_delay; /* these need to be restarted after a delay */ 108 struct usb_cdc_line_coding line; /* bits, stop, parity */ 109 struct delayed_work dwork; /* work queue entry for various purposes */ 110 unsigned int ctrlin; /* input control lines (DCD, DSR, RI, break, overruns) */ 111 unsigned int ctrlout; /* output control lines (DTR, RTS) */ 112 struct async_icount iocount; /* counters for control line changes */ 113 struct async_icount oldcount; /* for comparison of counter */ 114 wait_queue_head_t wioctl; /* for ioctl */ 115 unsigned int writesize; /* max packet size for the output bulk endpoint */ 116 unsigned int readsize,ctrlsize; /* buffer sizes for freeing */ 117 unsigned int minor; /* acm minor number */ 118 unsigned char clocal; /* termios CLOCAL */ 119 unsigned int ctrl_caps; /* control capabilities from the class specific header */ 120 unsigned int susp_count; /* number of suspended interfaces */ 121 unsigned int combined_interfaces:1; /* control and data collapsed */ 122 u8 bInterval; 123 struct usb_anchor delayed; /* writes queued for a device about to be woken */ 124 unsigned long quirks; 125 }; 126 127 /* constants describing various quirks and errors */ 128 #define NO_UNION_NORMAL BIT(0) 129 #define SINGLE_RX_URB BIT(1) 130 #define NO_CAP_LINE BIT(2) 131 #define IGNORE_DEVICE BIT(3) 132 #define QUIRK_CONTROL_LINE_STATE BIT(4) 133 #define CLEAR_HALT_CONDITIONS BIT(5) 134 #define SEND_ZERO_PACKET BIT(6) 135 #define DISABLE_ECHO BIT(7) 136