403 lines
10 KiB
C
403 lines
10 KiB
C
/*
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* USB ZyXEL omni.net LCD PLUS driver
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation.
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*
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* See Documentation/usb/usb-serial.txt for more information on using this
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* driver
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*
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* Please report both successes and troubles to the author at omninet@kroah.com
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*
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* (05/30/2001) gkh
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* switched from using spinlock to a semaphore, which fixes lots of
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* problems.
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*
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* (04/08/2001) gb
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* Identify version on module load.
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*
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* (11/01/2000) Adam J. Richter
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* usb_device_id table support
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*
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* (10/05/2000) gkh
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* Fixed bug with urb->dev not being set properly, now that the usb
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* core needs it.
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*
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* (08/28/2000) gkh
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* Added locks for SMP safeness.
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* Fixed MOD_INC and MOD_DEC logic and the ability to open a port more
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* than once.
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* Fixed potential race in omninet_write_bulk_callback
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*
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* (07/19/2000) gkh
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* Added module_init and module_exit functions to handle the fact that this
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* driver is a loadable module now.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/tty.h>
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#include <linux/tty_driver.h>
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#include <linux/tty_flip.h>
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#include <linux/module.h>
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#include <linux/spinlock.h>
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#include <linux/uaccess.h>
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#include <linux/usb.h>
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#include <linux/usb/serial.h>
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static int debug;
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/*
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* Version Information
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*/
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#define DRIVER_VERSION "v1.1"
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#define DRIVER_AUTHOR "Alessandro Zummo"
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#define DRIVER_DESC "USB ZyXEL omni.net LCD PLUS Driver"
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#define ZYXEL_VENDOR_ID 0x0586
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#define ZYXEL_OMNINET_ID 0x1000
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/* This one seems to be a re-branded ZyXEL device */
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#define BT_IGNITIONPRO_ID 0x2000
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/* function prototypes */
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static int omninet_open(struct tty_struct *tty, struct usb_serial_port *port);
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static void omninet_close(struct usb_serial_port *port);
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static void omninet_read_bulk_callback(struct urb *urb);
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static void omninet_write_bulk_callback(struct urb *urb);
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static int omninet_write(struct tty_struct *tty, struct usb_serial_port *port,
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const unsigned char *buf, int count);
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static int omninet_write_room(struct tty_struct *tty);
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static void omninet_disconnect(struct usb_serial *serial);
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static void omninet_release(struct usb_serial *serial);
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static int omninet_attach(struct usb_serial *serial);
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static const struct usb_device_id id_table[] = {
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{ USB_DEVICE(ZYXEL_VENDOR_ID, ZYXEL_OMNINET_ID) },
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{ USB_DEVICE(ZYXEL_VENDOR_ID, BT_IGNITIONPRO_ID) },
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{ } /* Terminating entry */
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};
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MODULE_DEVICE_TABLE(usb, id_table);
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static struct usb_driver omninet_driver = {
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.name = "omninet",
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.probe = usb_serial_probe,
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.disconnect = usb_serial_disconnect,
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.id_table = id_table,
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.no_dynamic_id = 1,
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};
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static struct usb_serial_driver zyxel_omninet_device = {
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.driver = {
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.owner = THIS_MODULE,
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.name = "omninet",
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},
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.description = "ZyXEL - omni.net lcd plus usb",
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.usb_driver = &omninet_driver,
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.id_table = id_table,
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.num_ports = 1,
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.attach = omninet_attach,
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.open = omninet_open,
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.close = omninet_close,
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.write = omninet_write,
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.write_room = omninet_write_room,
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.read_bulk_callback = omninet_read_bulk_callback,
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.write_bulk_callback = omninet_write_bulk_callback,
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.disconnect = omninet_disconnect,
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.release = omninet_release,
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};
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/* The protocol.
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*
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* The omni.net always exchange 64 bytes of data with the host. The first
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* four bytes are the control header, you can see it in the above structure.
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*
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* oh_seq is a sequence number. Don't know if/how it's used.
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* oh_len is the length of the data bytes in the packet.
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* oh_xxx Bit-mapped, related to handshaking and status info.
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* I normally set it to 0x03 in trasmitted frames.
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* 7: Active when the TA is in a CONNECTed state.
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* 6: unknown
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* 5: handshaking, unknown
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* 4: handshaking, unknown
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* 3: unknown, usually 0
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* 2: unknown, usually 0
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* 1: handshaking, unknown, usually set to 1 in trasmitted frames
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* 0: handshaking, unknown, usually set to 1 in trasmitted frames
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* oh_pad Probably a pad byte.
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*
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* After the header you will find data bytes if oh_len was greater than zero.
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*
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*/
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struct omninet_header {
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__u8 oh_seq;
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__u8 oh_len;
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__u8 oh_xxx;
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__u8 oh_pad;
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};
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struct omninet_data {
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__u8 od_outseq; /* Sequence number for bulk_out URBs */
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};
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static int omninet_attach(struct usb_serial *serial)
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{
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struct omninet_data *od;
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struct usb_serial_port *port = serial->port[0];
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od = kmalloc(sizeof(struct omninet_data), GFP_KERNEL);
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if (!od) {
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dev_err(&port->dev, "%s- kmalloc(%Zd) failed.\n",
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__func__, sizeof(struct omninet_data));
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return -ENOMEM;
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}
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usb_set_serial_port_data(port, od);
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return 0;
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}
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static int omninet_open(struct tty_struct *tty, struct usb_serial_port *port)
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{
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struct usb_serial *serial = port->serial;
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struct usb_serial_port *wport;
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int result = 0;
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dbg("%s - port %d", __func__, port->number);
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wport = serial->port[1];
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tty_port_tty_set(&wport->port, tty);
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/* Start reading from the device */
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usb_fill_bulk_urb(port->read_urb, serial->dev,
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usb_rcvbulkpipe(serial->dev,
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port->bulk_in_endpointAddress),
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port->read_urb->transfer_buffer,
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port->read_urb->transfer_buffer_length,
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omninet_read_bulk_callback, port);
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result = usb_submit_urb(port->read_urb, GFP_KERNEL);
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if (result)
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dev_err(&port->dev,
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"%s - failed submitting read urb, error %d\n",
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__func__, result);
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return result;
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}
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static void omninet_close(struct usb_serial_port *port)
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{
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dbg("%s - port %d", __func__, port->number);
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usb_kill_urb(port->read_urb);
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}
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#define OMNINET_DATAOFFSET 0x04
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#define OMNINET_HEADERLEN sizeof(struct omninet_header)
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#define OMNINET_BULKOUTSIZE (64 - OMNINET_HEADERLEN)
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static void omninet_read_bulk_callback(struct urb *urb)
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{
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struct usb_serial_port *port = urb->context;
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unsigned char *data = urb->transfer_buffer;
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struct omninet_header *header = (struct omninet_header *) &data[0];
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int status = urb->status;
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int result;
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int i;
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dbg("%s - port %d", __func__, port->number);
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if (status) {
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dbg("%s - nonzero read bulk status received: %d",
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__func__, status);
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return;
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}
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if (debug && header->oh_xxx != 0x30) {
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if (urb->actual_length) {
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printk(KERN_DEBUG "%s: omninet_read %d: ",
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__FILE__, header->oh_len);
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for (i = 0; i < (header->oh_len +
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OMNINET_HEADERLEN); i++)
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printk("%.2x ", data[i]);
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printk("\n");
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}
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}
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if (urb->actual_length && header->oh_len) {
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struct tty_struct *tty = tty_port_tty_get(&port->port);
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tty_insert_flip_string(tty, data + OMNINET_DATAOFFSET,
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header->oh_len);
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tty_flip_buffer_push(tty);
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tty_kref_put(tty);
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}
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/* Continue trying to always read */
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usb_fill_bulk_urb(urb, port->serial->dev,
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usb_rcvbulkpipe(port->serial->dev,
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port->bulk_in_endpointAddress),
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urb->transfer_buffer, urb->transfer_buffer_length,
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omninet_read_bulk_callback, port);
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result = usb_submit_urb(urb, GFP_ATOMIC);
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if (result)
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dev_err(&port->dev,
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"%s - failed resubmitting read urb, error %d\n",
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__func__, result);
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return;
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}
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static int omninet_write(struct tty_struct *tty, struct usb_serial_port *port,
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const unsigned char *buf, int count)
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{
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struct usb_serial *serial = port->serial;
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struct usb_serial_port *wport = serial->port[1];
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struct omninet_data *od = usb_get_serial_port_data(port);
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struct omninet_header *header = (struct omninet_header *)
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wport->write_urb->transfer_buffer;
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int result;
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dbg("%s - port %d", __func__, port->number);
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if (count == 0) {
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dbg("%s - write request of 0 bytes", __func__);
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return 0;
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}
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spin_lock_bh(&wport->lock);
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if (wport->write_urb_busy) {
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spin_unlock_bh(&wport->lock);
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dbg("%s - already writing", __func__);
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return 0;
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}
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wport->write_urb_busy = 1;
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spin_unlock_bh(&wport->lock);
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count = (count > OMNINET_BULKOUTSIZE) ? OMNINET_BULKOUTSIZE : count;
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memcpy(wport->write_urb->transfer_buffer + OMNINET_DATAOFFSET,
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buf, count);
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usb_serial_debug_data(debug, &port->dev, __func__, count,
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wport->write_urb->transfer_buffer);
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header->oh_seq = od->od_outseq++;
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header->oh_len = count;
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header->oh_xxx = 0x03;
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header->oh_pad = 0x00;
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/* send the data out the bulk port, always 64 bytes */
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wport->write_urb->transfer_buffer_length = 64;
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wport->write_urb->dev = serial->dev;
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result = usb_submit_urb(wport->write_urb, GFP_ATOMIC);
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if (result) {
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wport->write_urb_busy = 0;
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dev_err(&port->dev,
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"%s - failed submitting write urb, error %d\n",
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__func__, result);
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} else
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result = count;
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return result;
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}
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static int omninet_write_room(struct tty_struct *tty)
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{
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struct usb_serial_port *port = tty->driver_data;
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struct usb_serial *serial = port->serial;
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struct usb_serial_port *wport = serial->port[1];
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int room = 0; /* Default: no room */
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/* FIXME: no consistent locking for write_urb_busy */
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if (wport->write_urb_busy)
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room = wport->bulk_out_size - OMNINET_HEADERLEN;
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dbg("%s - returns %d", __func__, room);
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return room;
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}
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static void omninet_write_bulk_callback(struct urb *urb)
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{
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/* struct omninet_header *header = (struct omninet_header *)
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urb->transfer_buffer; */
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struct usb_serial_port *port = urb->context;
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int status = urb->status;
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dbg("%s - port %0x", __func__, port->number);
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port->write_urb_busy = 0;
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if (status) {
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dbg("%s - nonzero write bulk status received: %d",
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__func__, status);
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return;
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}
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usb_serial_port_softint(port);
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}
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static void omninet_disconnect(struct usb_serial *serial)
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{
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struct usb_serial_port *wport = serial->port[1];
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dbg("%s", __func__);
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usb_kill_urb(wport->write_urb);
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}
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static void omninet_release(struct usb_serial *serial)
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{
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struct usb_serial_port *port = serial->port[0];
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dbg("%s", __func__);
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kfree(usb_get_serial_port_data(port));
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}
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static int __init omninet_init(void)
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{
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int retval;
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retval = usb_serial_register(&zyxel_omninet_device);
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if (retval)
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goto failed_usb_serial_register;
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retval = usb_register(&omninet_driver);
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if (retval)
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goto failed_usb_register;
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printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
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DRIVER_DESC "\n");
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return 0;
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failed_usb_register:
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usb_serial_deregister(&zyxel_omninet_device);
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failed_usb_serial_register:
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return retval;
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}
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static void __exit omninet_exit(void)
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{
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usb_deregister(&omninet_driver);
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usb_serial_deregister(&zyxel_omninet_device);
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}
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module_init(omninet_init);
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module_exit(omninet_exit);
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MODULE_AUTHOR(DRIVER_AUTHOR);
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_LICENSE("GPL");
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module_param(debug, bool, S_IRUGO | S_IWUSR);
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MODULE_PARM_DESC(debug, "Debug enabled or not");
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