mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-28 23:24:50 +00:00
a81cf9799a
This should cut down latencies and waste if the tty layer writes single bytes. Signed-off-by: Oliver Neukum >oneukum@suse.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
138 lines
3.9 KiB
C
138 lines
3.9 KiB
C
/*
|
|
*
|
|
* 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 */
|
|
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];
|
|
struct acm_wb *putbuffer; /* for acm_tty_put_char() */
|
|
int rx_buflimit;
|
|
int rx_endpoint;
|
|
spinlock_t read_lock;
|
|
int write_used; /* number of non-empty write buffers */
|
|
int transmitting;
|
|
spinlock_t write_lock;
|
|
struct mutex mutex;
|
|
bool disconnected;
|
|
struct usb_cdc_line_coding line; /* bits, stop, parity */
|
|
struct work_struct work; /* work queue entry for line discipline waking up */
|
|
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 is_int_ep:1; /* interrupt endpoints contrary to spec used */
|
|
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)
|