266 lines
7.1 KiB
C
266 lines
7.1 KiB
C
/*
|
|
* USB ZyXEL omni.net LCD PLUS driver
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License version
|
|
* 2 as published by the Free Software Foundation.
|
|
*
|
|
* See Documentation/usb/usb-serial.txt for more information on using this
|
|
* driver
|
|
*
|
|
* Please report both successes and troubles to the author at omninet@kroah.com
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/tty.h>
|
|
#include <linux/tty_driver.h>
|
|
#include <linux/tty_flip.h>
|
|
#include <linux/module.h>
|
|
#include <linux/uaccess.h>
|
|
#include <linux/usb.h>
|
|
#include <linux/usb/serial.h>
|
|
|
|
#define DRIVER_AUTHOR "Alessandro Zummo"
|
|
#define DRIVER_DESC "USB ZyXEL omni.net LCD PLUS Driver"
|
|
|
|
#define ZYXEL_VENDOR_ID 0x0586
|
|
#define ZYXEL_OMNINET_ID 0x1000
|
|
/* This one seems to be a re-branded ZyXEL device */
|
|
#define BT_IGNITIONPRO_ID 0x2000
|
|
|
|
/* function prototypes */
|
|
static int omninet_open(struct tty_struct *tty, struct usb_serial_port *port);
|
|
static void omninet_process_read_urb(struct urb *urb);
|
|
static void omninet_write_bulk_callback(struct urb *urb);
|
|
static int omninet_write(struct tty_struct *tty, struct usb_serial_port *port,
|
|
const unsigned char *buf, int count);
|
|
static int omninet_write_room(struct tty_struct *tty);
|
|
static void omninet_disconnect(struct usb_serial *serial);
|
|
static int omninet_attach(struct usb_serial *serial);
|
|
static int omninet_port_probe(struct usb_serial_port *port);
|
|
static int omninet_port_remove(struct usb_serial_port *port);
|
|
|
|
static const struct usb_device_id id_table[] = {
|
|
{ USB_DEVICE(ZYXEL_VENDOR_ID, ZYXEL_OMNINET_ID) },
|
|
{ USB_DEVICE(ZYXEL_VENDOR_ID, BT_IGNITIONPRO_ID) },
|
|
{ } /* Terminating entry */
|
|
};
|
|
MODULE_DEVICE_TABLE(usb, id_table);
|
|
|
|
static struct usb_serial_driver zyxel_omninet_device = {
|
|
.driver = {
|
|
.owner = THIS_MODULE,
|
|
.name = "omninet",
|
|
},
|
|
.description = "ZyXEL - omni.net lcd plus usb",
|
|
.id_table = id_table,
|
|
.num_ports = 1,
|
|
.attach = omninet_attach,
|
|
.port_probe = omninet_port_probe,
|
|
.port_remove = omninet_port_remove,
|
|
.open = omninet_open,
|
|
.write = omninet_write,
|
|
.write_room = omninet_write_room,
|
|
.write_bulk_callback = omninet_write_bulk_callback,
|
|
.process_read_urb = omninet_process_read_urb,
|
|
.disconnect = omninet_disconnect,
|
|
};
|
|
|
|
static struct usb_serial_driver * const serial_drivers[] = {
|
|
&zyxel_omninet_device, NULL
|
|
};
|
|
|
|
|
|
/*
|
|
* The protocol.
|
|
*
|
|
* The omni.net always exchange 64 bytes of data with the host. The first
|
|
* four bytes are the control header.
|
|
*
|
|
* oh_seq is a sequence number. Don't know if/how it's used.
|
|
* oh_len is the length of the data bytes in the packet.
|
|
* oh_xxx Bit-mapped, related to handshaking and status info.
|
|
* I normally set it to 0x03 in transmitted frames.
|
|
* 7: Active when the TA is in a CONNECTed state.
|
|
* 6: unknown
|
|
* 5: handshaking, unknown
|
|
* 4: handshaking, unknown
|
|
* 3: unknown, usually 0
|
|
* 2: unknown, usually 0
|
|
* 1: handshaking, unknown, usually set to 1 in transmitted frames
|
|
* 0: handshaking, unknown, usually set to 1 in transmitted frames
|
|
* oh_pad Probably a pad byte.
|
|
*
|
|
* After the header you will find data bytes if oh_len was greater than zero.
|
|
*/
|
|
struct omninet_header {
|
|
__u8 oh_seq;
|
|
__u8 oh_len;
|
|
__u8 oh_xxx;
|
|
__u8 oh_pad;
|
|
};
|
|
|
|
struct omninet_data {
|
|
__u8 od_outseq; /* Sequence number for bulk_out URBs */
|
|
};
|
|
|
|
static int omninet_attach(struct usb_serial *serial)
|
|
{
|
|
/* The second bulk-out endpoint is used for writing. */
|
|
if (serial->num_bulk_out < 2) {
|
|
dev_err(&serial->interface->dev, "missing endpoints\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int omninet_port_probe(struct usb_serial_port *port)
|
|
{
|
|
struct omninet_data *od;
|
|
|
|
od = kzalloc(sizeof(*od), GFP_KERNEL);
|
|
if (!od)
|
|
return -ENOMEM;
|
|
|
|
usb_set_serial_port_data(port, od);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int omninet_port_remove(struct usb_serial_port *port)
|
|
{
|
|
struct omninet_data *od;
|
|
|
|
od = usb_get_serial_port_data(port);
|
|
kfree(od);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int omninet_open(struct tty_struct *tty, struct usb_serial_port *port)
|
|
{
|
|
return usb_serial_generic_open(tty, port);
|
|
}
|
|
|
|
#define OMNINET_HEADERLEN 4
|
|
#define OMNINET_BULKOUTSIZE 64
|
|
#define OMNINET_PAYLOADSIZE (OMNINET_BULKOUTSIZE - OMNINET_HEADERLEN)
|
|
|
|
static void omninet_process_read_urb(struct urb *urb)
|
|
{
|
|
struct usb_serial_port *port = urb->context;
|
|
const struct omninet_header *hdr = urb->transfer_buffer;
|
|
const unsigned char *data;
|
|
size_t data_len;
|
|
|
|
if (urb->actual_length <= OMNINET_HEADERLEN || !hdr->oh_len)
|
|
return;
|
|
|
|
data = (char *)urb->transfer_buffer + OMNINET_HEADERLEN;
|
|
data_len = min_t(size_t, urb->actual_length - OMNINET_HEADERLEN,
|
|
hdr->oh_len);
|
|
tty_insert_flip_string(&port->port, data, data_len);
|
|
tty_flip_buffer_push(&port->port);
|
|
}
|
|
|
|
static int omninet_write(struct tty_struct *tty, struct usb_serial_port *port,
|
|
const unsigned char *buf, int count)
|
|
{
|
|
struct usb_serial *serial = port->serial;
|
|
struct usb_serial_port *wport = serial->port[1];
|
|
|
|
struct omninet_data *od = usb_get_serial_port_data(port);
|
|
struct omninet_header *header = (struct omninet_header *)
|
|
wport->write_urb->transfer_buffer;
|
|
|
|
int result;
|
|
|
|
if (count == 0) {
|
|
dev_dbg(&port->dev, "%s - write request of 0 bytes\n", __func__);
|
|
return 0;
|
|
}
|
|
|
|
if (!test_and_clear_bit(0, &port->write_urbs_free)) {
|
|
dev_dbg(&port->dev, "%s - already writing\n", __func__);
|
|
return 0;
|
|
}
|
|
|
|
count = (count > OMNINET_PAYLOADSIZE) ? OMNINET_PAYLOADSIZE : count;
|
|
|
|
memcpy(wport->write_urb->transfer_buffer + OMNINET_HEADERLEN,
|
|
buf, count);
|
|
|
|
usb_serial_debug_data(&port->dev, __func__, count,
|
|
wport->write_urb->transfer_buffer);
|
|
|
|
header->oh_seq = od->od_outseq++;
|
|
header->oh_len = count;
|
|
header->oh_xxx = 0x03;
|
|
header->oh_pad = 0x00;
|
|
|
|
/* send the data out the bulk port, always 64 bytes */
|
|
wport->write_urb->transfer_buffer_length = OMNINET_BULKOUTSIZE;
|
|
|
|
result = usb_submit_urb(wport->write_urb, GFP_ATOMIC);
|
|
if (result) {
|
|
set_bit(0, &wport->write_urbs_free);
|
|
dev_err_console(port,
|
|
"%s - failed submitting write urb, error %d\n",
|
|
__func__, result);
|
|
} else
|
|
result = count;
|
|
|
|
return result;
|
|
}
|
|
|
|
|
|
static int omninet_write_room(struct tty_struct *tty)
|
|
{
|
|
struct usb_serial_port *port = tty->driver_data;
|
|
struct usb_serial *serial = port->serial;
|
|
struct usb_serial_port *wport = serial->port[1];
|
|
|
|
int room = 0; /* Default: no room */
|
|
|
|
if (test_bit(0, &wport->write_urbs_free))
|
|
room = wport->bulk_out_size - OMNINET_HEADERLEN;
|
|
|
|
dev_dbg(&port->dev, "%s - returns %d\n", __func__, room);
|
|
|
|
return room;
|
|
}
|
|
|
|
static void omninet_write_bulk_callback(struct urb *urb)
|
|
{
|
|
/* struct omninet_header *header = (struct omninet_header *)
|
|
urb->transfer_buffer; */
|
|
struct usb_serial_port *port = urb->context;
|
|
int status = urb->status;
|
|
|
|
set_bit(0, &port->write_urbs_free);
|
|
if (status) {
|
|
dev_dbg(&port->dev, "%s - nonzero write bulk status received: %d\n",
|
|
__func__, status);
|
|
return;
|
|
}
|
|
|
|
usb_serial_port_softint(port);
|
|
}
|
|
|
|
|
|
static void omninet_disconnect(struct usb_serial *serial)
|
|
{
|
|
struct usb_serial_port *wport = serial->port[1];
|
|
|
|
usb_kill_urb(wport->write_urb);
|
|
}
|
|
|
|
module_usb_serial_driver(serial_drivers, id_table);
|
|
|
|
MODULE_AUTHOR(DRIVER_AUTHOR);
|
|
MODULE_DESCRIPTION(DRIVER_DESC);
|
|
MODULE_LICENSE("GPL");
|