116 lines
3.5 KiB
C
116 lines
3.5 KiB
C
|
/* 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)
|