| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* |
| * |
| * Includes for cdc-acm.c |
| * |
| * Mainly take from usbnet's cdc-ether part |
| * |
| */ |
| |
| /* |
| * CMSPAR, some architectures can't have space and mark parity. |
| */ |
| |
| #ifndef CMSPAR |
| #define CMSPAR 0 |
| #endif |
| |
| /* |
| * Major and minor numbers. |
| */ |
| |
| #define ACM_TTY_MAJOR 166 |
| #define ACM_TTY_MINORS 256 |
| |
| #define ACM_MINOR_INVALID ACM_TTY_MINORS |
| |
| /* |
| * Requests. |
| */ |
| |
| #define USB_RT_ACM (USB_TYPE_CLASS | USB_RECIP_INTERFACE) |
| |
| /* |
| * Output control lines. |
| */ |
| |
| #define ACM_CTRL_DTR 0x01 |
| #define ACM_CTRL_RTS 0x02 |
| |
| /* |
| * Input control lines and line errors. |
| */ |
| |
| #define ACM_CTRL_DCD 0x01 |
| #define ACM_CTRL_DSR 0x02 |
| #define ACM_CTRL_BRK 0x04 |
| #define ACM_CTRL_RI 0x08 |
| |
| #define ACM_CTRL_FRAMING 0x10 |
| #define ACM_CTRL_PARITY 0x20 |
| #define ACM_CTRL_OVERRUN 0x40 |
| |
| /* |
| * Internal driver structures. |
| */ |
| |
| /* |
| * The only reason to have several buffers is to accommodate assumptions |
| * in line disciplines. They ask for empty space amount, receive our URB size, |
| * and proceed to issue several 1-character writes, assuming they will fit. |
| * The very first write takes a complete URB. Fortunately, this only happens |
| * when processing onlcr, so we only need 2 buffers. These values must be |
| * powers of 2. |
| */ |
| #define ACM_NW 16 |
| #define ACM_NR 16 |
| |
| struct acm_wb { |
| unsigned char *buf; |
| dma_addr_t dmah; |
| int len; |
| int use; |
| struct urb *urb; |
| struct acm *instance; |
| }; |
| |
| struct acm_rb { |
| int size; |
| unsigned char *base; |
| dma_addr_t dma; |
| int index; |
| struct acm *instance; |
| }; |
| |
| struct acm { |
| struct usb_device *dev; /* the corresponding usb device */ |
| struct usb_interface *control; /* control interface */ |
| struct usb_interface *data; /* data interface */ |
| unsigned in, out; /* i/o pipes */ |
| struct tty_port port; /* our tty port data */ |
| struct urb *ctrlurb; /* urbs */ |
| u8 *ctrl_buffer; /* buffers of urbs */ |
| dma_addr_t ctrl_dma; /* dma handles of buffers */ |
| u8 *country_codes; /* country codes from device */ |
| unsigned int country_code_size; /* size of this buffer */ |
| unsigned int country_rel_date; /* release date of version */ |
| struct acm_wb wb[ACM_NW]; |
| unsigned long read_urbs_free; |
| struct urb *read_urbs[ACM_NR]; |
| struct acm_rb read_buffers[ACM_NR]; |
| int rx_buflimit; |
| spinlock_t read_lock; |
| u8 *notification_buffer; /* to reassemble fragmented notifications */ |
| unsigned int nb_index; |
| unsigned int nb_size; |
| int transmitting; |
| spinlock_t write_lock; |
| struct mutex mutex; |
| bool disconnected; |
| unsigned long flags; |
| # define EVENT_TTY_WAKEUP 0 |
| # define EVENT_RX_STALL 1 |
| # define ACM_ERROR_DELAY 3 |
| unsigned long urbs_in_error_delay; /* these need to be restarted after a delay */ |
| struct usb_cdc_line_coding line; /* bits, stop, parity */ |
| struct delayed_work dwork; /* work queue entry for various purposes */ |
| unsigned int ctrlin; /* input control lines (DCD, DSR, RI, break, overruns) */ |
| unsigned int ctrlout; /* output control lines (DTR, RTS) */ |
| struct async_icount iocount; /* counters for control line changes */ |
| struct async_icount oldcount; /* for comparison of counter */ |
| wait_queue_head_t wioctl; /* for ioctl */ |
| unsigned int writesize; /* max packet size for the output bulk endpoint */ |
| unsigned int readsize,ctrlsize; /* buffer sizes for freeing */ |
| unsigned int minor; /* acm minor number */ |
| unsigned char clocal; /* termios CLOCAL */ |
| unsigned int ctrl_caps; /* control capabilities from the class specific header */ |
| unsigned int susp_count; /* number of suspended interfaces */ |
| unsigned int combined_interfaces:1; /* control and data collapsed */ |
| unsigned int throttled:1; /* actually throttled */ |
| unsigned int throttle_req:1; /* throttle requested */ |
| u8 bInterval; |
| struct usb_anchor delayed; /* writes queued for a device about to be woken */ |
| unsigned long quirks; |
| }; |
| |
| #define CDC_DATA_INTERFACE_TYPE 0x0a |
| |
| /* constants describing various quirks and errors */ |
| #define NO_UNION_NORMAL BIT(0) |
| #define SINGLE_RX_URB BIT(1) |
| #define NO_CAP_LINE BIT(2) |
| #define NO_DATA_INTERFACE BIT(4) |
| #define IGNORE_DEVICE BIT(5) |
| #define QUIRK_CONTROL_LINE_STATE BIT(6) |
| #define CLEAR_HALT_CONDITIONS BIT(7) |
| #define SEND_ZERO_PACKET BIT(8) |
| #define DISABLE_ECHO BIT(9) |