[PATCH] USB: add ark3116 usb to serial driver

Based on Simon's original driver, with some minor code cleanups and
tidying by me.

Cc: Simon Schulz <simon@auctionant.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

4 files changed, 477 insertions, 0 deletions

diff --git a/drivers/usb/serial/Kconfig b/drivers/usb/serial/Kconfig
index f96b73f54bf1..5c60be521561 100644
--- a/drivers/usb/serial/Kconfig
+++ b/drivers/usb/serial/Kconfig
@@ -71,6 +71,16 @@ config USB_SERIAL_ANYDATA
 	  To compile this driver as a module, choose M here: the
 	  module will be called anydata.
 
+config USB_SERIAL_ARK3116
+	tristate "USB ARK Micro 3116 USB Serial Driver (EXPERIMENTAL)"
+	depends on USB_SERIAL && EXPERIMENTAL
+	help
+	  Say Y here if you want to use a ARK Micro 3116 USB to Serial
+	  device.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called ark3116
+
 config USB_SERIAL_BELKIN
 	tristate "USB Belkin and Peracom Single Port Serial Driver"
 	depends on USB_SERIAL
diff --git a/drivers/usb/serial/Makefile b/drivers/usb/serial/Makefile
index 93c21245b1af..5a0960fc9d3e 100644
--- a/drivers/usb/serial/Makefile
+++ b/drivers/usb/serial/Makefile
@@ -13,6 +13,7 @@ usbserial-objs	:= usb-serial.o generic.o bus.o $(usbserial-obj-y)
 
 obj-$(CONFIG_USB_SERIAL_AIRPRIME)		+= airprime.o
 obj-$(CONFIG_USB_SERIAL_ANYDATA)		+= anydata.o
+obj-$(CONFIG_USB_SERIAL_ARK3116)		+= ark3116.o
 obj-$(CONFIG_USB_SERIAL_BELKIN)			+= belkin_sa.o
 obj-$(CONFIG_USB_SERIAL_CP2101)			+= cp2101.o
 obj-$(CONFIG_USB_SERIAL_CYBERJACK)		+= cyberjack.o
diff --git a/drivers/usb/serial/ark3116.c b/drivers/usb/serial/ark3116.c
new file mode 100644
index 000000000000..8dec796222a0
--- /dev/null
+++ b/drivers/usb/serial/ark3116.c
@@ -0,0 +1,465 @@
+/*
+ * ark3116
+ * - implements a driver for the arkmicro ark3116 chipset (vendor=0x6547,
+ *   productid=0x0232) (used in a datacable called KQ-U8A)
+ *
+ * - based on code by krisfx -> thanks !!
+ *   (see http://www.linuxquestions.org/questions/showthread.php?p=2184457#post2184457)
+ *
+ *  - based on logs created by usbsnoopy
+ *
+ *  Author   : Simon Schulz [ark3116_driver<AT>auctionant.de]
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/tty.h>
+#include <linux/module.h>
+#include <linux/usb.h>
+#include "usb-serial.h"
+
+
+static int debug;
+
+static struct usb_device_id id_table [] = {
+	{ USB_DEVICE(0x6547, 0x0232) },
+	{ },
+};
+MODULE_DEVICE_TABLE(usb, id_table);
+
+struct ark3116_private {
+	spinlock_t lock;
+	u8 termios_initialized;
+};
+
+static inline void ARK3116_SND(struct usb_serial *serial, int seq,
+			       __u8 request, __u8 requesttype,
+			       __u16 value, __u16 index)
+{
+	int result;
+	result = usb_control_msg(serial->dev,
+				 usb_sndctrlpipe(serial->dev,0),
+				 request, requesttype, value, index,
+				 NULL,0x00, 1000);
+	dbg("%03d > ok",seq);
+}
+
+static inline void ARK3116_RCV(struct usb_serial *serial, int seq,
+			       __u8 request, __u8 requesttype,
+			       __u16 value, __u16 index, __u8 expected,
+			       char *buf)
+{
+	int result;
+	result = usb_control_msg(serial->dev,
+			      usb_rcvctrlpipe(serial->dev,0),
+			      request, requesttype, value, index,
+			      buf, 0x0000001, 1000);
+	if (result)
+		dbg("%03d < %d bytes [0x%02X]",seq, result, buf[0]);
+	else
+		dbg("%03d < 0 bytes", seq);
+}
+
+
+static inline void ARK3116_RCV_QUIET(struct usb_serial *serial,
+				     __u8 request, __u8 requesttype,
+				     __u16 value, __u16 index, char *buf)
+{
+	usb_control_msg(serial->dev,
+			usb_rcvctrlpipe(serial->dev,0),
+			request, requesttype, value, index,
+			buf, 0x0000001, 1000);
+}
+
+
+static int ark3116_attach(struct usb_serial *serial)
+{
+	char *buf;
+	struct ark3116_private *priv;
+	int i;
+
+	for (i = 0; i < serial->num_ports; ++i) {
+		priv = kmalloc (sizeof (struct ark3116_private), GFP_KERNEL);
+		if (!priv)
+			goto cleanup;
+		memset (priv, 0x00, sizeof (struct ark3116_private));
+		spin_lock_init(&priv->lock);
+
+		usb_set_serial_port_data(serial->port[i], priv);
+	}
+
+	buf = kmalloc(1, GFP_KERNEL);
+	if (!buf) {
+		dbg("error kmalloc -> out of mem ?");
+		goto cleanup;
+	}
+
+	/* 3 */
+	ARK3116_SND(serial, 3,0xFE,0x40,0x0008,0x0002);
+	ARK3116_SND(serial, 4,0xFE,0x40,0x0008,0x0001);
+	ARK3116_SND(serial, 5,0xFE,0x40,0x0000,0x0008);
+	ARK3116_SND(serial, 6,0xFE,0x40,0x0000,0x000B);
+
+	/* <-- seq7 */
+	ARK3116_RCV(serial, 7,0xFE,0xC0,0x0000,0x0003, 0x00, buf);
+	ARK3116_SND(serial, 8,0xFE,0x40,0x0080,0x0003);
+	ARK3116_SND(serial, 9,0xFE,0x40,0x001A,0x0000);
+	ARK3116_SND(serial,10,0xFE,0x40,0x0000,0x0001);
+	ARK3116_SND(serial,11,0xFE,0x40,0x0000,0x0003);
+
+	/* <-- seq12 */
+	ARK3116_RCV(serial,12,0xFE,0xC0,0x0000,0x0004, 0x00, buf);
+	ARK3116_SND(serial,13,0xFE,0x40,0x0000,0x0004);
+
+	/* 14 */
+	ARK3116_RCV(serial,14,0xFE,0xC0,0x0000,0x0004, 0x00, buf);
+	ARK3116_SND(serial,15,0xFE,0x40,0x0000,0x0004);
+
+	/* 16 */
+	ARK3116_RCV(serial,16,0xFE,0xC0,0x0000,0x0004, 0x00, buf);
+	/* --> seq17 */
+	ARK3116_SND(serial,17,0xFE,0x40,0x0001,0x0004);
+
+	/* <-- seq18 */
+	ARK3116_RCV(serial,18,0xFE,0xC0,0x0000,0x0004, 0x01, buf);
+
+	/* --> seq19 */
+	ARK3116_SND(serial,19,0xFE,0x40,0x0003,0x0004);
+
+
+	/* <-- seq20 */
+	/* seems like serial port status info (RTS, CTS,...) */
+	/* returns modem control line status ?! */
+	ARK3116_RCV(serial,20,0xFE,0xC0,0x0000,0x0006, 0xFF, buf);
+
+	/* set 9600 baud & do some init ?! */
+	ARK3116_SND(serial,147,0xFE,0x40,0x0083,0x0003);
+	ARK3116_SND(serial,148,0xFE,0x40,0x0038,0x0000);
+	ARK3116_SND(serial,149,0xFE,0x40,0x0001,0x0001);
+	ARK3116_SND(serial,150,0xFE,0x40,0x0003,0x0003);
+	ARK3116_RCV(serial,151,0xFE,0xC0,0x0000,0x0004,0x03, buf);
+	ARK3116_SND(serial,152,0xFE,0x40,0x0000,0x0003);
+	ARK3116_RCV(serial,153,0xFE,0xC0,0x0000,0x0003,0x00, buf);
+	ARK3116_SND(serial,154,0xFE,0x40,0x0003,0x0003);
+
+	kfree(buf);
+	return(0);
+
+cleanup:
+	for (--i; i>=0; --i)
+		usb_set_serial_port_data(serial->port[i], NULL);
+	return -ENOMEM;
+}
+
+static void ark3116_set_termios(struct usb_serial_port *port,
+				struct termios *old_termios)
+{
+	struct usb_serial *serial = port->serial;
+	struct ark3116_private *priv = usb_get_serial_port_data(port);
+	unsigned int cflag = port->tty->termios->c_cflag;
+	unsigned long flags;
+	int baud;
+	int ark3116_baud;
+	char *buf;
+	char config;
+
+	config = 0;
+
+	dbg("%s - port %d", __FUNCTION__, port->number);
+
+	if ((!port->tty) || (!port->tty->termios)) {
+		dbg("%s - no tty structures", __FUNCTION__);
+		return;
+	}
+
+	spin_lock_irqsave(&priv->lock, flags);
+	if (!priv->termios_initialized) {
+		*(port->tty->termios) = tty_std_termios;
+		port->tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
+		priv->termios_initialized = 1;
+	}
+	spin_unlock_irqrestore(&priv->lock, flags);
+
+	cflag = port->tty->termios->c_cflag;
+
+	/* check that they really want us to change something: */
+	if (old_termios) {
+		if ((cflag == old_termios->c_cflag) &&
+		    (RELEVANT_IFLAG(port->tty->termios->c_iflag) ==
+		     RELEVANT_IFLAG(old_termios->c_iflag))) {
+			dbg("%s - nothing to change...", __FUNCTION__);
+			return;
+		}
+	}
+
+	buf = kmalloc(1, GFP_KERNEL);
+	if (!buf) {
+		dbg("error kmalloc");
+		return;
+	}
+
+	/* set data bit count (8/7/6/5) */
+	if (cflag & CSIZE){
+		switch (cflag & CSIZE){
+		case CS5:
+			config |= 0x00;
+			dbg("setting CS5");
+			break;
+		case CS6:
+			config |= 0x01;
+			dbg("setting CS6");
+			break;
+		case CS7:
+			config |= 0x02;
+			dbg("setting CS7");
+			break;
+		default:
+			err ("CSIZE was set but not CS5-CS8, using CS8!");
+		case CS8:
+			config |= 0x03;
+			dbg("setting CS8");
+			break;
+		}
+	}
+
+	/* set parity (NONE,EVEN,ODD) */
+	if (cflag & PARENB){
+		if (cflag & PARODD) {
+			config |= 0x08;
+			dbg("setting parity to ODD");
+		} else {
+			config |= 0x18;
+			dbg("setting parity to EVEN");
+		}
+	} else {
+		dbg("setting parity to NONE");
+	}
+
+	/* SET STOPBIT (1/2) */
+	if (cflag & CSTOPB) {
+		config |= 0x04;
+		dbg ("setting 2 stop bits");
+	} else {
+		dbg ("setting 1 stop bit");
+	}
+
+
+	/* set baudrate: */
+	baud = 0;
+	switch (cflag & CBAUD){
+		case B0:
+			err("can't set 0baud, using 9600 instead");
+			break;
+		case B75:	baud = 75;	break;
+		case B150:	baud = 150;	break;
+		case B300:	baud = 300;	break;
+		case B600:	baud = 600;	break;
+		case B1200:	baud = 1200;	break;
+		case B1800:	baud = 1800;	break;
+		case B2400:	baud = 2400;	break;
+		case B4800:	baud = 4800;	break;
+		case B9600:	baud = 9600;	break;
+		case B19200:	baud = 19200;	break;
+		case B38400:	baud = 38400;	break;
+		case B57600:	baud = 57600;	break;
+		case B115200:	baud = 115200;	break;
+		case B230400:	baud = 230400;	break;
+		case B460800:	baud = 460800;	break;
+		default:
+			dbg("does not support the baudrate requested (fix it)");
+			break;
+	}
+
+	/* set 9600 as default (if given baudrate is invalid for example) */
+	if (baud == 0)
+		baud = 9600;
+
+	/*
+	 * found by try'n'error, be careful, maybe there are other options
+	 * for multiplicator etc!
+	 */
+	if (baud == 460800)
+		/* strange, for 460800 the formula is wrong
+		 * (dont use round(), then 9600baud is wrong) */
+		ark3116_baud = 7;
+	else
+		ark3116_baud = 3000000 / baud;
+
+	/* ? */
+	ARK3116_RCV(serial,0,0xFE,0xC0,0x0000,0x0003, 0x03, buf);
+	/* offset = buf[0]; */
+	/* offset = 0x03; */
+	/* dbg("using 0x%04X as target for 0x0003:",0x0080+offset); */
+
+
+	/* set baudrate */
+	dbg("setting baudrate to %d (->reg=%d)",baud,ark3116_baud);
+	ARK3116_SND(serial,147,0xFE,0x40,0x0083,0x0003);
+	ARK3116_SND(serial,148,0xFE,0x40,(ark3116_baud & 0x00FF)   ,0x0000);
+	ARK3116_SND(serial,149,0xFE,0x40,(ark3116_baud & 0xFF00)>>8,0x0001);
+	ARK3116_SND(serial,150,0xFE,0x40,0x0003,0x0003);
+
+	/* ? */
+	ARK3116_RCV(serial,151,0xFE,0xC0,0x0000,0x0004,0x03, buf);
+	ARK3116_SND(serial,152,0xFE,0x40,0x0000,0x0003);
+
+	/* set data bit count, stop bit count & parity: */
+	dbg("updating bit count, stop bit or parity (cfg=0x%02X)", config);
+	ARK3116_RCV(serial,153,0xFE,0xC0,0x0000,0x0003,0x00, buf);
+	ARK3116_SND(serial,154,0xFE,0x40,config,0x0003);
+
+	if (cflag & CRTSCTS)
+		dbg("CRTSCTS not supported by chipset ?!");
+
+	/* TEST ARK3116_SND(154,0xFE,0x40,0xFFFF, 0x0006); */
+
+	kfree(buf);
+	return;
+}
+
+static int ark3116_open(struct usb_serial_port *port, struct file *filp)
+{
+	struct termios tmp_termios;
+	struct usb_serial *serial = port->serial;
+	char *buf;
+	int result = 0;
+
+	dbg("%s -  port %d", __FUNCTION__, port->number);
+
+	buf = kmalloc(1, GFP_KERNEL);
+	if (!buf) {
+		dbg("error kmalloc -> out of mem ?");
+		return -ENOMEM;
+	}
+
+	result = usb_serial_generic_open(port, filp);
+	if (result)
+		return result;
+
+	/* open */
+	ARK3116_RCV(serial,111,0xFE,0xC0,0x0000,0x0003, 0x02, buf);
+
+	ARK3116_SND(serial,112,0xFE,0x40,0x0082,0x0003);
+	ARK3116_SND(serial,113,0xFE,0x40,0x001A,0x0000);
+	ARK3116_SND(serial,114,0xFE,0x40,0x0000,0x0001);
+	ARK3116_SND(serial,115,0xFE,0x40,0x0002,0x0003);
+
+	ARK3116_RCV(serial,116,0xFE,0xC0,0x0000,0x0004, 0x03, buf);
+	ARK3116_SND(serial,117,0xFE,0x40,0x0002,0x0004);
+
+	ARK3116_RCV(serial,118,0xFE,0xC0,0x0000,0x0004, 0x02, buf);
+	ARK3116_SND(serial,119,0xFE,0x40,0x0000,0x0004);
+
+	ARK3116_RCV(serial,120,0xFE,0xC0,0x0000,0x0004, 0x00, buf);
+
+	ARK3116_SND(serial,121,0xFE,0x40,0x0001,0x0004);
+
+	ARK3116_RCV(serial,122,0xFE,0xC0,0x0000,0x0004, 0x01, buf);
+
+	ARK3116_SND(serial,123,0xFE,0x40,0x0003,0x0004);
+
+	/* returns different values (control lines ?!) */
+	ARK3116_RCV(serial,124,0xFE,0xC0,0x0000,0x0006, 0xFF, buf);
+
+	/* initialise termios: */
+	if (port->tty)
+		ark3116_set_termios(port, &tmp_termios);
+
+	kfree(buf);
+
+	return result;
+
+}
+
+static int ark3116_ioctl(struct usb_serial_port *port, struct file *file,
+			 unsigned int cmd, unsigned long arg)
+{
+	dbg("ioctl not supported yet...");
+	return -ENOIOCTLCMD;
+}
+
+static int ark3116_tiocmget(struct usb_serial_port *port, struct file *file)
+{
+	struct usb_serial *serial = port->serial;
+	char *buf;
+	char temp;
+
+	/* seems like serial port status info (RTS, CTS,...) is stored
+	 * in reg(?) 0x0006
+	 * pcb connection point 11 = GND -> sets bit4 of response
+	 * pcb connection point  7 = GND -> sets bit6 of response
+	 */
+
+	buf = kmalloc(1, GFP_KERNEL);
+	if (!buf) {
+		dbg("error kmalloc");
+		return -ENOMEM;
+	}
+
+	/* read register: */
+	ARK3116_RCV_QUIET(serial,0xFE,0xC0,0x0000,0x0006,buf);
+	temp = buf[0];
+	kfree(buf);
+
+	/* i do not really know if bit4=CTS and bit6=DSR... was just a
+	 * quick guess !!
+	 */
+	return  (temp & (1<<4) ? TIOCM_CTS : 0) |
+	        (temp & (1<<6) ? TIOCM_DSR : 0);
+}
+
+static struct usb_driver ark3116_driver = {
+	.name =		"ark3116",
+	.probe =	usb_serial_probe,
+	.disconnect =	usb_serial_disconnect,
+	.id_table =	id_table,
+};
+
+static struct usb_serial_driver ark3116_device = {
+	.driver = {
+		.owner =	THIS_MODULE,
+		.name =		"ark3116",
+	},
+	.id_table =		id_table,
+	.num_interrupt_in =	1,
+	.num_bulk_in =		1,
+	.num_bulk_out =		1,
+	.num_ports =		1,
+	.attach =		ark3116_attach,
+	.set_termios =		ark3116_set_termios,
+	.ioctl =		ark3116_ioctl,
+	.tiocmget =		ark3116_tiocmget,
+	.open =			ark3116_open,
+};
+
+static int __init ark3116_init(void)
+{
+	int retval;
+
+	retval = usb_serial_register(&ark3116_device);
+	if (retval)
+		return retval;
+	retval = usb_register(&ark3116_driver);
+	if (retval)
+		usb_serial_deregister(&ark3116_device);
+	return retval;
+}
+
+static void __exit ark3116_exit(void)
+{
+	usb_deregister(&ark3116_driver);
+	usb_serial_deregister(&ark3116_device);
+}
+
+module_init(ark3116_init);
+module_exit(ark3116_exit);
+MODULE_LICENSE("GPL");
+
+module_param(debug, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(debug, "Debug enabled or not");
+
diff --git a/drivers/usb/serial/generic.c b/drivers/usb/serial/generic.c
index 476cda107f4f..c62cc2876519 100644
--- a/drivers/usb/serial/generic.c
+++ b/drivers/usb/serial/generic.c
@@ -138,6 +138,7 @@ int usb_serial_generic_open (struct usb_serial_port *port, struct file *filp)
 
 	return result;
 }
+EXPORT_SYMBOL_GPL(usb_serial_generic_open);
 
 static void generic_cleanup (struct usb_serial_port *port)
 {