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- /* SPDX-License-Identifier: GPL-2.0 */
- /*
- *
- * Includes for cdc-acm.c
- *
- * Mainly take from usbnet's cdc-ether part
- *
- */
- /*
- * 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)
- /*
- * 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 {
- u8 *buf;
- dma_addr_t dmah;
- unsigned int len;
- struct urb *urb;
- struct acm *instance;
- bool use;
- };
- 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_THROTTLED 2
- # 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 */
- u8 bInterval;
- struct usb_anchor delayed; /* writes queued for a device about to be woken */
- unsigned long quirks;
- };
- /* 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 IGNORE_DEVICE BIT(3)
- #define QUIRK_CONTROL_LINE_STATE BIT(4)
- #define CLEAR_HALT_CONDITIONS BIT(5)
- #define SEND_ZERO_PACKET BIT(6)
- #define DISABLE_ECHO BIT(7)
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