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. These values must be
60 * powers of 2.
61 */
62 #define ACM_NW 2
63 #define ACM_NR 16
64
65 struct acm_wb {
66 unsigned char *buf;
67 dma_addr_t dmah;
68 int len;
69 int use;
70 };
71
72 struct acm_rb {
73 struct list_head list;
74 int size;
75 unsigned char *base;
76 dma_addr_t dma;
77 };
78
79 struct acm_ru {
80 struct list_head list;
81 struct acm_rb *buffer;
82 struct urb *urb;
83 struct acm *instance;
84 };
85
86 struct acm {
87 struct usb_device *dev; /* the corresponding usb device */
88 struct usb_interface *control; /* control interface */
89 struct usb_interface *data; /* data interface */
90 struct tty_struct *tty; /* the corresponding tty */
91 struct urb *ctrlurb, *writeurb; /* urbs */
92 u8 *ctrl_buffer; /* buffers of urbs */
93 dma_addr_t ctrl_dma; /* dma handles of buffers */
94 u8 *country_codes; /* country codes from device */
95 unsigned int country_code_size; /* size of this buffer */
96 unsigned int country_rel_date; /* release date of version */
97 struct acm_wb wb[ACM_NW];
98 struct acm_ru ru[ACM_NR];
99 struct acm_rb rb[ACM_NR];
100 int rx_buflimit;
101 int rx_endpoint;
102 spinlock_t read_lock;
103 struct list_head spare_read_urbs;
104 struct list_head spare_read_bufs;
105 struct list_head filled_read_bufs;
106 int write_current; /* current write buffer */
107 int write_used; /* number of non-empty write buffers */
108 int write_ready; /* write urb is not running */
109 spinlock_t write_lock;
110 struct mutex mutex;
111 struct usb_cdc_line_coding line; /* bits, stop, parity */
112 struct work_struct work; /* work queue entry for line discipline waking up */
113 struct tasklet_struct urb_task; /* rx processing */
114 spinlock_t throttle_lock; /* synchronize throtteling and read callback */
115 unsigned int ctrlin; /* input control lines (DCD, DSR, RI, break, overruns) */
116 unsigned int ctrlout; /* output control lines (DTR, RTS) */
117 unsigned int writesize; /* max packet size for the output bulk endpoint */
118 unsigned int readsize,ctrlsize; /* buffer sizes for freeing */
119 unsigned int used; /* someone has this acm's device open */
120 unsigned int minor; /* acm minor number */
121 unsigned char throttle; /* throttled by tty layer */
122 unsigned char clocal; /* termios CLOCAL */
123 unsigned int ctrl_caps; /* control capabilities from the class specific header */
124 unsigned int susp_count; /* number of suspended interfaces */
125 };
126
127 #define CDC_DATA_INTERFACE_TYPE 0x0a
128
129 /* constants describing various quirks and errors */
130 #define NO_UNION_NORMAL 1
131 #define SINGLE_RX_URB 2
132
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