tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 *
3 * Includes for cdc-acm.c
4 *
5 * Mainly take from usbnet's cdc-ether part
6 *
7 */
8
9/*
10 * CMSPAR, some architectures can't have space and mark parity.
11 */
12
13#ifndef CMSPAR
14#define CMSPAR 0
15#endif
16
17/*
18 * Major and minor numbers.
19 */
20
21#define ACM_TTY_MAJOR 166
22#define ACM_TTY_MINORS 32
23
24/*
25 * Requests.
26 */
27
28#define USB_RT_ACM (USB_TYPE_CLASS | USB_RECIP_INTERFACE)
29
30/*
31 * Output control lines.
32 */
33
34#define ACM_CTRL_DTR 0x01
35#define ACM_CTRL_RTS 0x02
36
37/*
38 * Input control lines and line errors.
39 */
40
41#define ACM_CTRL_DCD 0x01
42#define ACM_CTRL_DSR 0x02
43#define ACM_CTRL_BRK 0x04
44#define ACM_CTRL_RI 0x08
45
46#define ACM_CTRL_FRAMING 0x10
47#define ACM_CTRL_PARITY 0x20
48#define ACM_CTRL_OVERRUN 0x40
49
50/*
51 * Internal driver structures.
52 */
53
54/*
55 * The only reason to have several buffers is to accomodate assumptions
56 * in line disciplines. They ask for empty space amount, receive our URB size,
57 * and proceed to issue several 1-character writes, assuming they will fit.
58 * The very first write takes a complete URB. Fortunately, this only happens
59 * when processing onlcr, so we only need 2 buffers.
60 */
61#define ACM_NWB 2
62struct acm_wb {
63 unsigned char *buf;
64 dma_addr_t dmah;
65 int len;
66 int use;
67};
68
69struct acm {
70 struct usb_device *dev; /* the corresponding usb device */
71 struct usb_interface *control; /* control interface */
72 struct usb_interface *data; /* data interface */
73 struct tty_struct *tty; /* the corresponding tty */
74 struct urb *ctrlurb, *readurb, *writeurb; /* urbs */
75 u8 *ctrl_buffer, *read_buffer; /* buffers of urbs */
76 dma_addr_t ctrl_dma, read_dma; /* dma handles of buffers */
77 struct acm_wb wb[ACM_NWB];
78 int write_current; /* current write buffer */
79 int write_used; /* number of non-empty write buffers */
80 int write_ready; /* write urb is not running */
81 spinlock_t write_lock;
82 struct usb_cdc_line_coding line; /* bits, stop, parity */
83 struct work_struct work; /* work queue entry for line discipline waking up */
84 struct tasklet_struct bh; /* rx processing */
85 spinlock_t throttle_lock; /* synchronize throtteling and read callback */
86 unsigned int ctrlin; /* input control lines (DCD, DSR, RI, break, overruns) */
87 unsigned int ctrlout; /* output control lines (DTR, RTS) */
88 unsigned int writesize; /* max packet size for the output bulk endpoint */
89 unsigned int readsize,ctrlsize; /* buffer sizes for freeing */
90 unsigned int used; /* someone has this acm's device open */
91 unsigned int minor; /* acm minor number */
92 unsigned char throttle; /* throttled by tty layer */
93 unsigned char clocal; /* termios CLOCAL */
94 unsigned char resubmit_to_unthrottle; /* throtteling has disabled the read urb */
95 unsigned int ctrl_caps; /* control capabilities from the class specific header */
96};
97
98#define CDC_DATA_INTERFACE_TYPE 0x0a
99
100/* constants describing various quirks and errors */
101#define NO_UNION_NORMAL 1