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USB: ark3116: Setup some basic infrastructure for new ark3116 driver.
Signed-off-by: Bart Hartgers <bart.hartgers@gmail.com> Cc: Mike McCormack <mikem@ring3k.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
bart.hartgers@gmail.com
Greg Kroah-Hartman
parent
a2582bd478
commit
149fc791a4
@ -1,4 +1,6 @@
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/*
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* Copyright (C) 2009 by Bart Hartgers (bart.hartgers+ark3116@gmail.com)
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* Original version:
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* Copyright (C) 2006
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* Simon Schulz (ark3116_driver <at> auctionant.de)
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*
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@ -6,10 +8,13 @@
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* - implements a driver for the arkmicro ark3116 chipset (vendor=0x6547,
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* productid=0x0232) (used in a datacable called KQ-U8A)
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*
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* - based on code by krisfx -> thanks !!
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* (see http://www.linuxquestions.org/questions/showthread.php?p=2184457#post2184457)
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* Supports full modem status lines, break, hardware flow control. Does not
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* support software flow control, since I do not know how to enable it in hw.
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*
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* - based on logs created by usbsnoopy
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* This driver is a essentially new implementation. I initially dug
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* into the old ark3116.c driver and suddenly realized the ark3116 is
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* a 16450 with a USB interface glued to it. See comments at the
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* bottom of this file.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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@ -19,15 +24,31 @@
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/ioctl.h>
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#include <linux/tty.h>
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#include <linux/tty_flip.h>
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#include <linux/module.h>
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#include <linux/usb.h>
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#include <linux/usb/serial.h>
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#include <linux/serial.h>
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#include <linux/serial_reg.h>
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#include <linux/uaccess.h>
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#include <linux/mutex.h>
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#include <linux/spinlock.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 "v0.5"
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#define DRIVER_AUTHOR "Bart Hartgers <bart.hartgers+ark3116@gmail.com>"
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#define DRIVER_DESC "USB ARK3116 serial/IrDA driver"
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#define DRIVER_DEV_DESC "ARK3116 RS232/IrDA"
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#define DRIVER_NAME "ark3116"
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/* usb timeout of 1 second */
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#define ARK_TIMEOUT (1*HZ)
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static struct usb_device_id id_table [] = {
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{ USB_DEVICE(0x6547, 0x0232) },
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@ -45,6 +66,53 @@ static int is_irda(struct usb_serial *serial)
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return 0;
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}
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struct ark3116_private {
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wait_queue_head_t delta_msr_wait;
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struct async_icount icount;
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int irda; /* 1 for irda device */
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/* protects hw register updates */
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struct mutex hw_lock;
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int quot; /* baudrate divisor */
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__u32 lcr; /* line control register value */
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__u32 hcr; /* handshake control register (0x8)
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* value */
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__u32 mcr; /* modem contol register value */
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/* protects the status values below */
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spinlock_t status_lock;
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__u32 msr; /* modem status register value */
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__u32 lsr; /* line status register value */
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};
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static int ark3116_write_reg(struct usb_serial *serial,
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unsigned reg, __u8 val)
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{
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int result;
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/* 0xfe 0x40 are magic values taken from original driver */
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result = usb_control_msg(serial->dev,
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usb_sndctrlpipe(serial->dev, 0),
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0xfe, 0x40, val, reg,
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NULL, 0, ARK_TIMEOUT);
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return result;
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}
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static int ark3116_read_reg(struct usb_serial *serial,
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unsigned reg, unsigned char *buf)
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{
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int result;
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/* 0xfe 0xc0 are magic values taken from original driver */
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result = usb_control_msg(serial->dev,
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usb_rcvctrlpipe(serial->dev, 0),
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0xfe, 0xc0, 0, reg,
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buf, 1, ARK_TIMEOUT);
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if (result < 0)
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return result;
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else
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return buf[0];
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}
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static inline void ARK3116_SND(struct usb_serial *serial, int seq,
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__u8 request, __u8 requesttype,
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__u16 value, __u16 index)
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@ -465,7 +533,12 @@ static int __init ark3116_init(void)
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if (retval)
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return retval;
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retval = usb_register(&ark3116_driver);
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if (retval)
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if (retval == 0) {
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printk(KERN_INFO "%s:"
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DRIVER_VERSION ":"
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DRIVER_DESC "\n",
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KBUILD_MODNAME);
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} else
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usb_serial_deregister(&ark3116_device);
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return retval;
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}
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@ -480,6 +553,109 @@ module_init(ark3116_init);
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module_exit(ark3116_exit);
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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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MODULE_AUTHOR(DRIVER_AUTHOR);
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MODULE_DESCRIPTION(DRIVER_DESC);
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module_param(debug, bool, S_IRUGO | S_IWUSR);
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MODULE_PARM_DESC(debug, "Enable debug");
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/*
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* The following describes what I learned from studying the old
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* ark3116.c driver, disassembling the windows driver, and some lucky
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* guesses. Since I do not have any datasheet or other
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* documentation, inaccuracies are almost guaranteed.
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*
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* Some specs for the ARK3116 can be found here:
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* http://web.archive.org/web/20060318000438/
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* www.arkmicro.com/en/products/view.php?id=10
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* On that page, 2 GPIO pins are mentioned: I assume these are the
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* OUT1 and OUT2 pins of the UART, so I added support for those
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* through the MCR. Since the pins are not available on my hardware,
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* I could not verify this.
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* Also, it states there is "on-chip hardware flow control". I have
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* discovered how to enable that. Unfortunately, I do not know how to
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* enable XON/XOFF (software) flow control, which would need support
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* from the chip as well to work. Because of the wording on the web
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* page there is a real possibility the chip simply does not support
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* software flow control.
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*
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* I got my ark3116 as part of a mobile phone adapter cable. On the
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* PCB, the following numbered contacts are present:
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*
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* 1:- +5V
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* 2:o DTR
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* 3:i RX
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* 4:i DCD
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* 5:o RTS
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* 6:o TX
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* 7:i RI
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* 8:i DSR
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* 10:- 0V
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* 11:i CTS
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*
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* On my chip, all signals seem to be 3.3V, but 5V tolerant. But that
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* may be different for the one you have ;-).
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*
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* The windows driver limits the registers to 0-F, so I assume there
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* are actually 16 present on the device.
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*
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* On an UART interrupt, 4 bytes of data come in on the interrupt
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* endpoint. The bytes are 0xe8 IIR LSR MSR.
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*
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* The baudrate seems to be generated from the 12MHz crystal, using
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* 4-times subsampling. So quot=12e6/(4*baud). Also see description
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* of register E.
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*
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* Registers 0-7:
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* These seem to be the same as for a regular 16450. The FCR is set
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* to UART_FCR_DMA_SELECT (0x8), I guess to enable transfers between
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* the UART and the USB bridge/DMA engine.
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*
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* Register 8:
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* By trial and error, I found out that bit 0 enables hardware CTS,
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* stopping TX when CTS is +5V. Bit 1 does the same for RTS, making
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* RTS +5V when the 3116 cannot transfer the data to the USB bus
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* (verified by disabling the reading URB). Note that as far as I can
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* tell, the windows driver does NOT use this, so there might be some
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* hardware bug or something.
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*
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* According to a patch provided here
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* (http://lkml.org/lkml/2009/7/26/56), the ARK3116 can also be used
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* as an IrDA dongle. Since I do not have such a thing, I could not
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* investigate that aspect. However, I can speculate ;-).
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*
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* - IrDA encodes data differently than RS232. Most likely, one of
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* the bits in registers 9..E enables the IR ENDEC (encoder/decoder).
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* - Depending on the IR transceiver, the input and output need to be
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* inverted, so there are probably bits for that as well.
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* - IrDA is half-duplex, so there should be a bit for selecting that.
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*
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* This still leaves at least two registers unaccounted for. Perhaps
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* The chip can do XON/XOFF or CRC in HW?
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*
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* Register 9:
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* Set to 0x00 for IrDA, when the baudrate is initialised.
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*
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* Register A:
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* Set to 0x01 for IrDA, at init.
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*
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* Register B:
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* Set to 0x01 for IrDA, 0x00 for RS232, at init.
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*
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* Register C:
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* Set to 00 for IrDA, at init.
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*
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* Register D:
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* Set to 0x41 for IrDA, at init.
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*
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* Register E:
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* Somekind of baudrate override. The windows driver seems to set
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* this to 0x00 for normal baudrates, 0x01 for 460800, 0x02 for 921600.
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* Since 460800 and 921600 cannot be obtained by dividing 3MHz by an integer,
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* it could be somekind of subdivisor thingy.
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* However,it does not seem to do anything: selecting 921600 (divisor 3,
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* reg E=2), still gets 1 MHz. I also checked if registers 9, C or F would
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* work, but they don't.
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*
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* Register F: unknown
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*/
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