1 /* SPDX-License-Identifier: GPL-2.0 */
4 * Includes for cdc-acm.c
6 * Mainly take from usbnet's cdc-ether part
11 * CMSPAR, some architectures can't have space and mark parity.
19 * Major and minor numbers.
22 #define ACM_TTY_MAJOR 166
23 #define ACM_TTY_MINORS 256
29 #define USB_RT_ACM (USB_TYPE_CLASS | USB_RECIP_INTERFACE)
32 * Output control lines.
35 #define ACM_CTRL_DTR 0x01
36 #define ACM_CTRL_RTS 0x02
39 * Input control lines and line errors.
42 #define ACM_CTRL_DCD 0x01
43 #define ACM_CTRL_DSR 0x02
44 #define ACM_CTRL_BRK 0x04
45 #define ACM_CTRL_RI 0x08
47 #define ACM_CTRL_FRAMING 0x10
48 #define ACM_CTRL_PARITY 0x20
49 #define ACM_CTRL_OVERRUN 0x40
52 * Internal driver structures.
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
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
];
100 spinlock_t read_lock
;
101 u8
*notification_buffer
; /* to reassemble fragmented notifications */
102 unsigned int nb_index
;
103 unsigned int nb_size
;
105 spinlock_t write_lock
;
109 # define EVENT_TTY_WAKEUP 0
110 # define EVENT_RX_STALL 1
111 # define ACM_ERROR_DELAY 3
112 unsigned long urbs_in_error_delay
; /* these need to be restarted after a delay */
113 struct usb_cdc_line_coding line
; /* bits, stop, parity */
114 struct work_struct work
; /* work queue entry for various purposes*/
115 struct delayed_work dwork
; /* for cool downs needed in error recovery */
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 unsigned int throttled
:1; /* actually throttled */
129 unsigned int throttle_req
:1; /* throttle requested */
131 struct usb_anchor delayed
; /* writes queued for a device about to be woken */
132 unsigned long quirks
;
135 #define CDC_DATA_INTERFACE_TYPE 0x0a
137 /* constants describing various quirks and errors */
138 #define NO_UNION_NORMAL BIT(0)
139 #define SINGLE_RX_URB BIT(1)
140 #define NO_CAP_LINE BIT(2)
141 #define NO_DATA_INTERFACE BIT(4)
142 #define IGNORE_DEVICE BIT(5)
143 #define QUIRK_CONTROL_LINE_STATE BIT(6)
144 #define CLEAR_HALT_CONDITIONS BIT(7)
145 #define SEND_ZERO_PACKET BIT(8)
146 #define DISABLE_ECHO BIT(9)