xref: /openbmc/linux/drivers/usb/class/cdc-acm.h (revision 22246614)
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  16
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 	struct urb		*urb;
71 	struct acm		*instance;
72 };
73 
74 struct acm_rb {
75 	struct list_head	list;
76 	int			size;
77 	unsigned char		*base;
78 	dma_addr_t		dma;
79 };
80 
81 struct acm_ru {
82 	struct list_head	list;
83 	struct acm_rb		*buffer;
84 	struct urb		*urb;
85 	struct acm		*instance;
86 };
87 
88 struct acm {
89 	struct usb_device *dev;				/* the corresponding usb device */
90 	struct usb_interface *control;			/* control interface */
91 	struct usb_interface *data;			/* data interface */
92 	struct tty_struct *tty;				/* the corresponding tty */
93 	struct urb *ctrlurb;			/* urbs */
94 	u8 *ctrl_buffer;				/* buffers of urbs */
95 	dma_addr_t ctrl_dma;				/* dma handles of buffers */
96 	u8 *country_codes;				/* country codes from device */
97 	unsigned int country_code_size;			/* size of this buffer */
98 	unsigned int country_rel_date;			/* release date of version */
99 	struct acm_wb wb[ACM_NW];
100 	struct acm_ru ru[ACM_NR];
101 	struct acm_rb rb[ACM_NR];
102 	int rx_buflimit;
103 	int rx_endpoint;
104 	spinlock_t read_lock;
105 	struct list_head spare_read_urbs;
106 	struct list_head spare_read_bufs;
107 	struct list_head filled_read_bufs;
108 	int write_used;					/* number of non-empty write buffers */
109 	int write_ready;				/* write urb is not running */
110 	spinlock_t write_lock;
111 	struct mutex mutex;
112 	struct usb_cdc_line_coding line;		/* bits, stop, parity */
113 	struct work_struct work;			/* work queue entry for line discipline waking up */
114 	struct tasklet_struct urb_task;                 /* rx processing */
115 	spinlock_t throttle_lock;			/* synchronize throtteling and read callback */
116 	unsigned int ctrlin;				/* input control lines (DCD, DSR, RI, break, overruns) */
117 	unsigned int ctrlout;				/* output control lines (DTR, RTS) */
118 	unsigned int writesize;				/* max packet size for the output bulk endpoint */
119 	unsigned int readsize,ctrlsize;			/* buffer sizes for freeing */
120 	unsigned int used;				/* someone has this acm's device open */
121 	unsigned int minor;				/* acm minor number */
122 	unsigned char throttle;				/* throttled by tty layer */
123 	unsigned char clocal;				/* termios CLOCAL */
124 	unsigned int ctrl_caps;				/* control capabilities from the class specific header */
125 	unsigned int susp_count;			/* number of suspended interfaces */
126 };
127 
128 #define CDC_DATA_INTERFACE_TYPE	0x0a
129 
130 /* constants describing various quirks and errors */
131 #define NO_UNION_NORMAL			1
132 #define SINGLE_RX_URB			2
133