2005-04-16 22:20:36 +00:00
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/*
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* USB ZyXEL omni.net LCD PLUS driver
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*
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2007-06-12 18:43:37 +00:00
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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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2005-04-16 22:20:36 +00:00
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*
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* See Documentation/usb/usb-serial.txt for more information on using this 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 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 <asm/uaccess.h>
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#include <linux/usb.h>
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2006-07-12 04:22:58 +00:00
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#include <linux/usb/serial.h>
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2005-04-16 22:20:36 +00:00
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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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#define BT_IGNITIONPRO_ID 0x2000 /* This one seems to be a re-branded ZyXEL device */
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/* function prototypes */
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static int omninet_open (struct usb_serial_port *port, struct file *filp);
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static void omninet_close (struct usb_serial_port *port, struct file *filp);
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IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.
The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around. On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).
Where appropriate, an arch may override the generic storage facility and do
something different with the variable. On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.
Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions. Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller. A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.
I've build this code with allyesconfig for x86_64 and i386. I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.
This will affect all archs. Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:
struct pt_regs *old_regs = set_irq_regs(regs);
And put the old one back at the end:
set_irq_regs(old_regs);
Don't pass regs through to generic_handle_irq() or __do_IRQ().
In timer_interrupt(), this sort of change will be necessary:
- update_process_times(user_mode(regs));
- profile_tick(CPU_PROFILING, regs);
+ update_process_times(user_mode(get_irq_regs()));
+ profile_tick(CPU_PROFILING);
I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().
Some notes on the interrupt handling in the drivers:
(*) input_dev() is now gone entirely. The regs pointer is no longer stored in
the input_dev struct.
(*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does
something different depending on whether it's been supplied with a regs
pointer or not.
(*) Various IRQ handler function pointers have been moved to type
irq_handler_t.
Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 13:55:46 +00:00
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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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2005-04-16 22:20:36 +00:00
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static int omninet_write (struct usb_serial_port *port, const unsigned char *buf, int count);
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static int omninet_write_room (struct usb_serial_port *port);
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static void omninet_shutdown (struct usb_serial *serial);
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2007-03-27 14:02:34 +00:00
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static int omninet_attach (struct usb_serial *serial);
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2005-04-16 22:20:36 +00:00
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static 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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2005-11-16 21:41:28 +00:00
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.no_dynamic_id = 1,
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2005-04-16 22:20:36 +00:00
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};
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2005-06-21 04:15:16 +00:00
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static struct usb_serial_driver zyxel_omninet_device = {
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2005-06-21 04:15:16 +00:00
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.driver = {
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.owner = THIS_MODULE,
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2005-06-21 04:15:16 +00:00
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.name = "omninet",
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2005-06-21 04:15:16 +00:00
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},
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2005-06-21 04:15:16 +00:00
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.description = "ZyXEL - omni.net lcd plus usb",
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2006-12-17 20:50:24 +00:00
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.usb_driver = &omninet_driver,
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2005-04-16 22:20:36 +00:00
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.id_table = id_table,
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.num_ports = 1,
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2007-03-27 14:02:34 +00:00
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.attach = omninet_attach,
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2005-04-16 22:20:36 +00:00
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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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.shutdown = omninet_shutdown,
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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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{
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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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{
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__u8 od_outseq; // Sequence number for bulk_out URBs
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};
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2007-03-27 14:02:34 +00:00
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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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err("%s- kmalloc(%Zd) failed.", __FUNCTION__, 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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2005-04-16 22:20:36 +00:00
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static int omninet_open (struct usb_serial_port *port, struct file *filp)
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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", __FUNCTION__, port->number);
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wport = serial->port[1];
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wport->tty = 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, port->bulk_in_endpointAddress),
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port->read_urb->transfer_buffer, 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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2007-03-20 12:15:05 +00:00
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if (result) {
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2005-04-16 22:20:36 +00:00
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err("%s - failed submitting read urb, error %d", __FUNCTION__, result);
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2007-03-20 12:15:05 +00:00
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}
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2005-04-16 22:20:36 +00:00
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return result;
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}
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static void omninet_close (struct usb_serial_port *port, struct file * filp)
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{
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dbg("%s - port %d", __FUNCTION__, 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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IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.
The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around. On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).
Where appropriate, an arch may override the generic storage facility and do
something different with the variable. On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.
Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions. Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller. A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.
I've build this code with allyesconfig for x86_64 and i386. I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.
This will affect all archs. Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:
struct pt_regs *old_regs = set_irq_regs(regs);
And put the old one back at the end:
set_irq_regs(old_regs);
Don't pass regs through to generic_handle_irq() or __do_IRQ().
In timer_interrupt(), this sort of change will be necessary:
- update_process_times(user_mode(regs));
- profile_tick(CPU_PROFILING, regs);
+ update_process_times(user_mode(get_irq_regs()));
+ profile_tick(CPU_PROFILING);
I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().
Some notes on the interrupt handling in the drivers:
(*) input_dev() is now gone entirely. The regs pointer is no longer stored in
the input_dev struct.
(*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does
something different depending on whether it's been supplied with a regs
pointer or not.
(*) Various IRQ handler function pointers have been moved to type
irq_handler_t.
Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 13:55:46 +00:00
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static void omninet_read_bulk_callback (struct urb *urb)
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2005-04-16 22:20:36 +00:00
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{
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struct usb_serial_port *port = (struct usb_serial_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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2007-06-15 22:44:13 +00:00
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int status = urb->status;
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2005-04-16 22:20:36 +00:00
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int i;
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int result;
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2006-03-20 22:28:39 +00:00
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dbg("%s - port %d", __FUNCTION__, port->number);
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2005-04-16 22:20:36 +00:00
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2007-06-15 22:44:13 +00:00
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if (status) {
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dbg("%s - nonzero read bulk status received: %d",
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__FUNCTION__, status);
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2005-04-16 22:20:36 +00:00
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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 __FILE__ ": omninet_read %d: ", header->oh_len);
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for (i = 0; i < (header->oh_len + OMNINET_HEADERLEN); i++) {
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printk ("%.2x ", data[i]);
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}
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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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for (i = 0; i < header->oh_len; i++) {
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tty_insert_flip_char(port->tty, data[OMNINET_DATAOFFSET + i], 0);
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}
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tty_flip_buffer_push(port->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, 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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err("%s - failed resubmitting read urb, error %d", __FUNCTION__, result);
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return;
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}
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static int omninet_write (struct usb_serial_port *port, 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 *) wport->write_urb->transfer_buffer;
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int result;
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|
2006-03-20 22:28:39 +00:00
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dbg("%s - port %d", __FUNCTION__, port->number);
|
2005-04-16 22:20:36 +00:00
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if (count == 0) {
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dbg("%s - write request of 0 bytes", __FUNCTION__);
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return (0);
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}
|
2005-04-23 19:49:16 +00:00
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2006-09-25 10:51:41 +00:00
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spin_lock_bh(&wport->lock);
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2006-05-02 06:44:45 +00:00
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if (wport->write_urb_busy) {
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2006-09-25 10:51:41 +00:00
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spin_unlock_bh(&wport->lock);
|
2005-04-16 22:20:36 +00:00
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dbg("%s - already writing", __FUNCTION__);
|
2005-04-23 19:49:16 +00:00
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return 0;
|
2005-04-16 22:20:36 +00:00
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}
|
2006-05-02 06:44:45 +00:00
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|
wport->write_urb_busy = 1;
|
2006-09-25 10:51:41 +00:00
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|
|
spin_unlock_bh(&wport->lock);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
count = (count > OMNINET_BULKOUTSIZE) ? OMNINET_BULKOUTSIZE : count;
|
|
|
|
|
|
|
|
memcpy (wport->write_urb->transfer_buffer + OMNINET_DATAOFFSET, buf, count);
|
|
|
|
|
|
|
|
usb_serial_debug_data(debug, &port->dev, __FUNCTION__, 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 = 64;
|
|
|
|
|
|
|
|
wport->write_urb->dev = serial->dev;
|
|
|
|
result = usb_submit_urb(wport->write_urb, GFP_ATOMIC);
|
2005-04-23 19:49:16 +00:00
|
|
|
if (result) {
|
2006-05-02 06:44:45 +00:00
|
|
|
wport->write_urb_busy = 0;
|
2005-04-16 22:20:36 +00:00
|
|
|
err("%s - failed submitting write urb, error %d", __FUNCTION__, result);
|
2005-04-23 19:49:16 +00:00
|
|
|
} else
|
2005-04-16 22:20:36 +00:00
|
|
|
result = count;
|
|
|
|
|
|
|
|
return result;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static int omninet_write_room (struct usb_serial_port *port)
|
|
|
|
{
|
|
|
|
struct usb_serial *serial = port->serial;
|
|
|
|
struct usb_serial_port *wport = serial->port[1];
|
|
|
|
|
|
|
|
int room = 0; // Default: no room
|
|
|
|
|
2005-04-23 19:49:16 +00:00
|
|
|
if (wport->write_urb_busy)
|
2005-04-16 22:20:36 +00:00
|
|
|
room = wport->bulk_out_size - OMNINET_HEADERLEN;
|
|
|
|
|
2006-03-20 22:28:39 +00:00
|
|
|
dbg("%s - returns %d", __FUNCTION__, room);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
return (room);
|
|
|
|
}
|
|
|
|
|
IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.
The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around. On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).
Where appropriate, an arch may override the generic storage facility and do
something different with the variable. On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.
Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions. Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller. A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.
I've build this code with allyesconfig for x86_64 and i386. I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.
This will affect all archs. Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:
struct pt_regs *old_regs = set_irq_regs(regs);
And put the old one back at the end:
set_irq_regs(old_regs);
Don't pass regs through to generic_handle_irq() or __do_IRQ().
In timer_interrupt(), this sort of change will be necessary:
- update_process_times(user_mode(regs));
- profile_tick(CPU_PROFILING, regs);
+ update_process_times(user_mode(get_irq_regs()));
+ profile_tick(CPU_PROFILING);
I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().
Some notes on the interrupt handling in the drivers:
(*) input_dev() is now gone entirely. The regs pointer is no longer stored in
the input_dev struct.
(*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does
something different depending on whether it's been supplied with a regs
pointer or not.
(*) Various IRQ handler function pointers have been moved to type
irq_handler_t.
Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 13:55:46 +00:00
|
|
|
static void omninet_write_bulk_callback (struct urb *urb)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
/* struct omninet_header *header = (struct omninet_header *) urb->transfer_buffer; */
|
|
|
|
struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
|
2007-06-15 22:44:13 +00:00
|
|
|
int status = urb->status;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2006-03-20 22:28:39 +00:00
|
|
|
dbg("%s - port %0x\n", __FUNCTION__, port->number);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2005-04-23 19:49:16 +00:00
|
|
|
port->write_urb_busy = 0;
|
2007-06-15 22:44:13 +00:00
|
|
|
if (status) {
|
|
|
|
dbg("%s - nonzero write bulk status received: %d",
|
|
|
|
__FUNCTION__, status);
|
2005-04-16 22:20:36 +00:00
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
2006-05-23 04:58:49 +00:00
|
|
|
usb_serial_port_softint(port);
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static void omninet_shutdown (struct usb_serial *serial)
|
|
|
|
{
|
2007-03-27 14:02:34 +00:00
|
|
|
struct usb_serial_port *wport = serial->port[1];
|
|
|
|
struct usb_serial_port *port = serial->port[0];
|
2005-04-16 22:20:36 +00:00
|
|
|
dbg ("%s", __FUNCTION__);
|
2007-03-27 14:02:34 +00:00
|
|
|
|
|
|
|
usb_kill_urb(wport->write_urb);
|
|
|
|
kfree(usb_get_serial_port_data(port));
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static int __init omninet_init (void)
|
|
|
|
{
|
|
|
|
int retval;
|
|
|
|
retval = usb_serial_register(&zyxel_omninet_device);
|
|
|
|
if (retval)
|
|
|
|
goto failed_usb_serial_register;
|
|
|
|
retval = usb_register(&omninet_driver);
|
|
|
|
if (retval)
|
|
|
|
goto failed_usb_register;
|
|
|
|
info(DRIVER_VERSION ":" DRIVER_DESC);
|
|
|
|
return 0;
|
|
|
|
failed_usb_register:
|
|
|
|
usb_serial_deregister(&zyxel_omninet_device);
|
|
|
|
failed_usb_serial_register:
|
|
|
|
return retval;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static void __exit omninet_exit (void)
|
|
|
|
{
|
|
|
|
usb_deregister (&omninet_driver);
|
|
|
|
usb_serial_deregister (&zyxel_omninet_device);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
module_init(omninet_init);
|
|
|
|
module_exit(omninet_exit);
|
|
|
|
|
|
|
|
MODULE_AUTHOR( DRIVER_AUTHOR );
|
|
|
|
MODULE_DESCRIPTION( DRIVER_DESC );
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
|
|
|
|
module_param(debug, bool, S_IRUGO | S_IWUSR);
|
|
|
|
MODULE_PARM_DESC(debug, "Debug enabled or not");
|