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 struct acm_wb wb[ACM_NW]; 95 struct acm_ru ru[ACM_NR]; 96 struct acm_rb rb[ACM_NR]; 97 int rx_buflimit; 98 int rx_endpoint; 99 spinlock_t read_lock; 100 struct list_head spare_read_urbs; 101 struct list_head spare_read_bufs; 102 struct list_head filled_read_bufs; 103 int write_current; /* current write buffer */ 104 int write_used; /* number of non-empty write buffers */ 105 int write_ready; /* write urb is not running */ 106 spinlock_t write_lock; 107 struct usb_cdc_line_coding line; /* bits, stop, parity */ 108 struct work_struct work; /* work queue entry for line discipline waking up */ 109 struct tasklet_struct urb_task; /* rx processing */ 110 spinlock_t throttle_lock; /* synchronize throtteling and read callback */ 111 unsigned int ctrlin; /* input control lines (DCD, DSR, RI, break, overruns) */ 112 unsigned int ctrlout; /* output control lines (DTR, RTS) */ 113 unsigned int writesize; /* max packet size for the output bulk endpoint */ 114 unsigned int readsize,ctrlsize; /* buffer sizes for freeing */ 115 unsigned int used; /* someone has this acm's device open */ 116 unsigned int minor; /* acm minor number */ 117 unsigned char throttle; /* throttled by tty layer */ 118 unsigned char clocal; /* termios CLOCAL */ 119 unsigned int ctrl_caps; /* control capabilities from the class specific header */ 120 }; 121 122 #define CDC_DATA_INTERFACE_TYPE 0x0a 123 124 /* constants describing various quirks and errors */ 125 #define NO_UNION_NORMAL 1 126 #define SINGLE_RX_URB 2 127