linux-imx

/* 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

​

/*

 * 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 */