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linux/drivers/usb/serial/ssu100.c
Greg Kroah-Hartman 68e2411345 USB: serial: rework usb_serial_register/deregister_drivers() 
This reworks the usb_serial_register_drivers() and
usb_serial_deregister_drivers() to not need a pointer to a struct
usb_driver anymore.  The usb_driver structure is now created dynamically
and registered and unregistered as needed.

This saves lines of code in each usb-serial driver.  All in-kernel users
of these functions were also fixed up at this time.  The pl2303 driver
was tested that everything worked properly.

Thanks for the idea to do this from Alan Stern.

Cc: Adhir Ramjiawan <adhirramjiawan0@gmail.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Al Borchers <alborchers@steinerpoint.com>
Cc: Aleksey Babahin <tamerlan311@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andrew Worsley <amworsley@gmail.com>
Cc: Bart Hartgers <bart.hartgers@gmail.com>
Cc: Bill Pemberton <wfp5p@virginia.edu>
Cc: Dan Carpenter <error27@gmail.com>
Cc: Dan Williams <dcbw@redhat.com>
Cc: Donald Lee <donald@asix.com.tw>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Felipe Balbi <balbi@ti.com>
Cc: Gary Brubaker <xavyer@ix.netcom.com>
Cc: Jesper Juhl <jj@chaosbits.net>
Cc: Jiri Kosina <jkosina@suse.cz>
Cc: Johan Hovold <jhovold@gmail.com>
Cc: Julia Lawall <julia@diku.dk>
Cc: Kautuk Consul <consul.kautuk@gmail.com>
Cc: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Cc: Lonnie Mendez <dignome@gmail.com>
Cc: Matthias Bruestle and Harald Welte <support@reiner-sct.com>
Cc: Matthias Urlichs <smurf@smurf.noris.de>
Cc: Mauro Carvalho Chehab <mchehab@redhat.com>
Cc: Michal Sroczynski <msroczyn@gmail.com>
Cc: "Michał Wróbel" <michal.wrobel@flytronic.pl>
Cc: Oliver Neukum <oliver@neukum.name>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Peter Berger <pberger@brimson.com>
Cc: Preston Fick <preston.fick@silabs.com>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: Rigbert Hamisch <rigbert@gmx.de>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Simon Arlott <simon@fire.lp0.eu>
Cc: Support Department <support@connecttech.com>
Cc: Thomas Tuttle <ttuttle@chromium.org>
Cc: Uwe Bonnes <bon@elektron.ikp.physik.tu-darmstadt.de>
Cc: Wang YanQing <Udknight@gmail.com>
Cc: William Greathouse <wgreathouse@smva.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-05-08 15:46:14 -07:00

674 lines
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/*
* usb-serial driver for Quatech SSU-100
*
* based on ftdi_sio.c and the original serqt_usb.c from Quatech
*
*/
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
#include <linux/module.h>
#include <linux/serial.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>
#include <linux/serial_reg.h>
#include <linux/uaccess.h>
#define QT_OPEN_CLOSE_CHANNEL 0xca
#define QT_SET_GET_DEVICE 0xc2
#define QT_SET_GET_REGISTER 0xc0
#define QT_GET_SET_PREBUF_TRIG_LVL 0xcc
#define QT_SET_ATF 0xcd
#define QT_GET_SET_UART 0xc1
#define QT_TRANSFER_IN 0xc0
#define QT_HW_FLOW_CONTROL_MASK 0xc5
#define QT_SW_FLOW_CONTROL_MASK 0xc6
#define SERIAL_MSR_MASK 0xf0
#define SERIAL_CRTSCTS ((UART_MCR_RTS << 8) | UART_MSR_CTS)
#define SERIAL_EVEN_PARITY (UART_LCR_PARITY | UART_LCR_EPAR)
#define MAX_BAUD_RATE 460800
#define ATC_DISABLED 0x00
#define DUPMODE_BITS 0xc0
#define RR_BITS 0x03
#define LOOPMODE_BITS 0x41
#define RS232_MODE 0x00
#define RTSCTS_TO_CONNECTOR 0x40
#define CLKS_X4 0x02
#define FULLPWRBIT 0x00000080
#define NEXT_BOARD_POWER_BIT 0x00000004
static bool debug;
/* Version Information */
#define DRIVER_VERSION "v0.1"
#define DRIVER_DESC "Quatech SSU-100 USB to Serial Driver"
#define USB_VENDOR_ID_QUATECH 0x061d /* Quatech VID */
#define QUATECH_SSU100 0xC020 /* SSU100 */
static const struct usb_device_id id_table[] = {
{USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_SSU100)},
{} /* Terminating entry */
};
MODULE_DEVICE_TABLE(usb, id_table);
struct ssu100_port_private {
spinlock_t status_lock;
u8 shadowLSR;
u8 shadowMSR;
wait_queue_head_t delta_msr_wait; /* Used for TIOCMIWAIT */
struct async_icount icount;
};
static void ssu100_release(struct usb_serial *serial)
{
struct ssu100_port_private *priv = usb_get_serial_port_data(*serial->port);
kfree(priv);
}
static inline int ssu100_control_msg(struct usb_device *dev,
u8 request, u16 data, u16 index)
{
return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
request, 0x40, data, index,
NULL, 0, 300);
}
static inline int ssu100_setdevice(struct usb_device *dev, u8 *data)
{
u16 x = ((u16)(data[1] << 8) | (u16)(data[0]));
return ssu100_control_msg(dev, QT_SET_GET_DEVICE, x, 0);
}
static inline int ssu100_getdevice(struct usb_device *dev, u8 *data)
{
return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
QT_SET_GET_DEVICE, 0xc0, 0, 0,
data, 3, 300);
}
static inline int ssu100_getregister(struct usb_device *dev,
unsigned short uart,
unsigned short reg,
u8 *data)
{
return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
QT_SET_GET_REGISTER, 0xc0, reg,
uart, data, sizeof(*data), 300);
}
static inline int ssu100_setregister(struct usb_device *dev,
unsigned short uart,
unsigned short reg,
u16 data)
{
u16 value = (data << 8) | reg;
return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
QT_SET_GET_REGISTER, 0x40, value, uart,
NULL, 0, 300);
}
#define set_mctrl(dev, set) update_mctrl((dev), (set), 0)
#define clear_mctrl(dev, clear) update_mctrl((dev), 0, (clear))
/* these do not deal with device that have more than 1 port */
static inline int update_mctrl(struct usb_device *dev, unsigned int set,
unsigned int clear)
{
unsigned urb_value;
int result;
if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0) {
dbg("%s - DTR|RTS not being set|cleared", __func__);
return 0; /* no change */
}
clear &= ~set; /* 'set' takes precedence over 'clear' */
urb_value = 0;
if (set & TIOCM_DTR)
urb_value |= UART_MCR_DTR;
if (set & TIOCM_RTS)
urb_value |= UART_MCR_RTS;
result = ssu100_setregister(dev, 0, UART_MCR, urb_value);
if (result < 0)
dbg("%s Error from MODEM_CTRL urb", __func__);
return result;
}
static int ssu100_initdevice(struct usb_device *dev)
{
u8 *data;
int result = 0;
data = kzalloc(3, GFP_KERNEL);
if (!data)
return -ENOMEM;
result = ssu100_getdevice(dev, data);
if (result < 0) {
dbg("%s - get_device failed %i", __func__, result);
goto out;
}
data[1] &= ~FULLPWRBIT;
result = ssu100_setdevice(dev, data);
if (result < 0) {
dbg("%s - setdevice failed %i", __func__, result);
goto out;
}
result = ssu100_control_msg(dev, QT_GET_SET_PREBUF_TRIG_LVL, 128, 0);
if (result < 0) {
dbg("%s - set prebuffer level failed %i", __func__, result);
goto out;
}
result = ssu100_control_msg(dev, QT_SET_ATF, ATC_DISABLED, 0);
if (result < 0) {
dbg("%s - set ATFprebuffer level failed %i", __func__, result);
goto out;
}
result = ssu100_getdevice(dev, data);
if (result < 0) {
dbg("%s - get_device failed %i", __func__, result);
goto out;
}
data[0] &= ~(RR_BITS | DUPMODE_BITS);
data[0] |= CLKS_X4;
data[1] &= ~(LOOPMODE_BITS);
data[1] |= RS232_MODE;
result = ssu100_setdevice(dev, data);
if (result < 0) {
dbg("%s - setdevice failed %i", __func__, result);
goto out;
}
out: kfree(data);
return result;
}
static void ssu100_set_termios(struct tty_struct *tty,
struct usb_serial_port *port,
struct ktermios *old_termios)
{
struct usb_device *dev = port->serial->dev;
struct ktermios *termios = tty->termios;
u16 baud, divisor, remainder;
unsigned int cflag = termios->c_cflag;
u16 urb_value = 0; /* will hold the new flags */
int result;
if (cflag & PARENB) {
if (cflag & PARODD)
urb_value |= UART_LCR_PARITY;
else
urb_value |= SERIAL_EVEN_PARITY;
}
switch (cflag & CSIZE) {
case CS5:
urb_value |= UART_LCR_WLEN5;
break;
case CS6:
urb_value |= UART_LCR_WLEN6;
break;
case CS7:
urb_value |= UART_LCR_WLEN7;
break;
default:
case CS8:
urb_value |= UART_LCR_WLEN8;
break;
}
baud = tty_get_baud_rate(tty);
if (!baud)
baud = 9600;
dbg("%s - got baud = %d\n", __func__, baud);
divisor = MAX_BAUD_RATE / baud;
remainder = MAX_BAUD_RATE % baud;
if (((remainder * 2) >= baud) && (baud != 110))
divisor++;
urb_value = urb_value << 8;
result = ssu100_control_msg(dev, QT_GET_SET_UART, divisor, urb_value);
if (result < 0)
dbg("%s - set uart failed", __func__);
if (cflag & CRTSCTS)
result = ssu100_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
SERIAL_CRTSCTS, 0);
else
result = ssu100_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
0, 0);
if (result < 0)
dbg("%s - set HW flow control failed", __func__);
if (I_IXOFF(tty) || I_IXON(tty)) {
u16 x = ((u16)(START_CHAR(tty) << 8) | (u16)(STOP_CHAR(tty)));
result = ssu100_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
x, 0);
} else
result = ssu100_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
0, 0);
if (result < 0)
dbg("%s - set SW flow control failed", __func__);
}
static int ssu100_open(struct tty_struct *tty, struct usb_serial_port *port)
{
struct usb_device *dev = port->serial->dev;
struct ssu100_port_private *priv = usb_get_serial_port_data(port);
u8 *data;
int result;
unsigned long flags;
data = kzalloc(2, GFP_KERNEL);
if (!data)
return -ENOMEM;
result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
QT_OPEN_CLOSE_CHANNEL,
QT_TRANSFER_IN, 0x01,
0, data, 2, 300);
if (result < 0) {
dbg("%s - open failed %i", __func__, result);
kfree(data);
return result;
}
spin_lock_irqsave(&priv->status_lock, flags);
priv->shadowLSR = data[0];
priv->shadowMSR = data[1];
spin_unlock_irqrestore(&priv->status_lock, flags);
kfree(data);
/* set to 9600 */
result = ssu100_control_msg(dev, QT_GET_SET_UART, 0x30, 0x0300);
if (result < 0)
dbg("%s - set uart failed", __func__);
if (tty)
ssu100_set_termios(tty, port, tty->termios);
return usb_serial_generic_open(tty, port);
}
static void ssu100_close(struct usb_serial_port *port)
{
usb_serial_generic_close(port);
}
static int get_serial_info(struct usb_serial_port *port,
struct serial_struct __user *retinfo)
{
struct serial_struct tmp;
if (!retinfo)
return -EFAULT;
memset(&tmp, 0, sizeof(tmp));
tmp.line = port->serial->minor;
tmp.port = 0;
tmp.irq = 0;
tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
tmp.xmit_fifo_size = port->bulk_out_size;
tmp.baud_base = 9600;
tmp.close_delay = 5*HZ;
tmp.closing_wait = 30*HZ;
if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
return -EFAULT;
return 0;
}
static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
{
struct ssu100_port_private *priv = usb_get_serial_port_data(port);
struct async_icount prev, cur;
unsigned long flags;
spin_lock_irqsave(&priv->status_lock, flags);
prev = priv->icount;
spin_unlock_irqrestore(&priv->status_lock, flags);
while (1) {
wait_event_interruptible(priv->delta_msr_wait,
((priv->icount.rng != prev.rng) ||
(priv->icount.dsr != prev.dsr) ||
(priv->icount.dcd != prev.dcd) ||
(priv->icount.cts != prev.cts)));
if (signal_pending(current))
return -ERESTARTSYS;
spin_lock_irqsave(&priv->status_lock, flags);
cur = priv->icount;
spin_unlock_irqrestore(&priv->status_lock, flags);
if ((prev.rng == cur.rng) &&
(prev.dsr == cur.dsr) &&
(prev.dcd == cur.dcd) &&
(prev.cts == cur.cts))
return -EIO;
if ((arg & TIOCM_RNG && (prev.rng != cur.rng)) ||
(arg & TIOCM_DSR && (prev.dsr != cur.dsr)) ||
(arg & TIOCM_CD && (prev.dcd != cur.dcd)) ||
(arg & TIOCM_CTS && (prev.cts != cur.cts)))
return 0;
}
return 0;
}
static int ssu100_get_icount(struct tty_struct *tty,
struct serial_icounter_struct *icount)
{
struct usb_serial_port *port = tty->driver_data;
struct ssu100_port_private *priv = usb_get_serial_port_data(port);
struct async_icount cnow = priv->icount;
icount->cts = cnow.cts;
icount->dsr = cnow.dsr;
icount->rng = cnow.rng;
icount->dcd = cnow.dcd;
icount->rx = cnow.rx;
icount->tx = cnow.tx;
icount->frame = cnow.frame;
icount->overrun = cnow.overrun;
icount->parity = cnow.parity;
icount->brk = cnow.brk;
icount->buf_overrun = cnow.buf_overrun;
return 0;
}
static int ssu100_ioctl(struct tty_struct *tty,
unsigned int cmd, unsigned long arg)
{
struct usb_serial_port *port = tty->driver_data;
dbg("%s cmd 0x%04x", __func__, cmd);
switch (cmd) {
case TIOCGSERIAL:
return get_serial_info(port,
(struct serial_struct __user *) arg);
case TIOCMIWAIT:
return wait_modem_info(port, arg);
default:
break;
}
dbg("%s arg not supported", __func__);
return -ENOIOCTLCMD;
}
static int ssu100_attach(struct usb_serial *serial)
{
struct ssu100_port_private *priv;
struct usb_serial_port *port = *serial->port;
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv) {
dev_err(&port->dev, "%s- kmalloc(%Zd) failed.\n", __func__,
sizeof(*priv));
return -ENOMEM;
}
spin_lock_init(&priv->status_lock);
init_waitqueue_head(&priv->delta_msr_wait);
usb_set_serial_port_data(port, priv);
return ssu100_initdevice(serial->dev);
}
static int ssu100_tiocmget(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
struct usb_device *dev = port->serial->dev;
u8 *d;
int r;
d = kzalloc(2, GFP_KERNEL);
if (!d)
return -ENOMEM;
r = ssu100_getregister(dev, 0, UART_MCR, d);
if (r < 0)
goto mget_out;
r = ssu100_getregister(dev, 0, UART_MSR, d+1);
if (r < 0)
goto mget_out;
r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) |
(d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) |
(d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) |
(d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) |
(d[1] & UART_MSR_RI ? TIOCM_RI : 0) |
(d[1] & UART_MSR_DSR ? TIOCM_DSR : 0);
mget_out:
kfree(d);
return r;
}
static int ssu100_tiocmset(struct tty_struct *tty,
unsigned int set, unsigned int clear)
{
struct usb_serial_port *port = tty->driver_data;
struct usb_device *dev = port->serial->dev;
return update_mctrl(dev, set, clear);
}
static void ssu100_dtr_rts(struct usb_serial_port *port, int on)
{
struct usb_device *dev = port->serial->dev;
mutex_lock(&port->serial->disc_mutex);
if (!port->serial->disconnected) {
/* Disable flow control */
if (!on &&
ssu100_setregister(dev, 0, UART_MCR, 0) < 0)
dev_err(&port->dev, "error from flowcontrol urb\n");
/* drop RTS and DTR */
if (on)
set_mctrl(dev, TIOCM_DTR | TIOCM_RTS);
else
clear_mctrl(dev, TIOCM_DTR | TIOCM_RTS);
}
mutex_unlock(&port->serial->disc_mutex);
}
static void ssu100_update_msr(struct usb_serial_port *port, u8 msr)
{
struct ssu100_port_private *priv = usb_get_serial_port_data(port);
unsigned long flags;
spin_lock_irqsave(&priv->status_lock, flags);
priv->shadowMSR = msr;
spin_unlock_irqrestore(&priv->status_lock, flags);
if (msr & UART_MSR_ANY_DELTA) {
/* update input line counters */
if (msr & UART_MSR_DCTS)
priv->icount.cts++;
if (msr & UART_MSR_DDSR)
priv->icount.dsr++;
if (msr & UART_MSR_DDCD)
priv->icount.dcd++;
if (msr & UART_MSR_TERI)
priv->icount.rng++;
wake_up_interruptible(&priv->delta_msr_wait);
}
}
static void ssu100_update_lsr(struct usb_serial_port *port, u8 lsr,
char *tty_flag)
{
struct ssu100_port_private *priv = usb_get_serial_port_data(port);
unsigned long flags;
spin_lock_irqsave(&priv->status_lock, flags);
priv->shadowLSR = lsr;
spin_unlock_irqrestore(&priv->status_lock, flags);
*tty_flag = TTY_NORMAL;
if (lsr & UART_LSR_BRK_ERROR_BITS) {
/* we always want to update icount, but we only want to
* update tty_flag for one case */
if (lsr & UART_LSR_BI) {
priv->icount.brk++;
*tty_flag = TTY_BREAK;
usb_serial_handle_break(port);
}
if (lsr & UART_LSR_PE) {
priv->icount.parity++;
if (*tty_flag == TTY_NORMAL)
*tty_flag = TTY_PARITY;
}
if (lsr & UART_LSR_FE) {
priv->icount.frame++;
if (*tty_flag == TTY_NORMAL)
*tty_flag = TTY_FRAME;
}
if (lsr & UART_LSR_OE){
priv->icount.overrun++;
if (*tty_flag == TTY_NORMAL)
*tty_flag = TTY_OVERRUN;
}
}
}
static int ssu100_process_packet(struct urb *urb,
struct tty_struct *tty)
{
struct usb_serial_port *port = urb->context;
char *packet = (char *)urb->transfer_buffer;
char flag = TTY_NORMAL;
u32 len = urb->actual_length;
int i;
char *ch;
if ((len >= 4) &&
(packet[0] == 0x1b) && (packet[1] == 0x1b) &&
((packet[2] == 0x00) || (packet[2] == 0x01))) {
if (packet[2] == 0x00) {
ssu100_update_lsr(port, packet[3], &flag);
if (flag == TTY_OVERRUN)
tty_insert_flip_char(tty, 0, TTY_OVERRUN);
}
if (packet[2] == 0x01)
ssu100_update_msr(port, packet[3]);
len -= 4;
ch = packet + 4;
} else
ch = packet;
if (!len)
return 0; /* status only */
if (port->port.console && port->sysrq) {
for (i = 0; i < len; i++, ch++) {
if (!usb_serial_handle_sysrq_char(port, *ch))
tty_insert_flip_char(tty, *ch, flag);
}
} else
tty_insert_flip_string_fixed_flag(tty, ch, flag, len);
return len;
}
static void ssu100_process_read_urb(struct urb *urb)
{
struct usb_serial_port *port = urb->context;
struct tty_struct *tty;
int count;
tty = tty_port_tty_get(&port->port);
if (!tty)
return;
count = ssu100_process_packet(urb, tty);
if (count)
tty_flip_buffer_push(tty);
tty_kref_put(tty);
}
static struct usb_serial_driver ssu100_device = {
.driver = {
.owner = THIS_MODULE,
.name = "ssu100",
},
.description = DRIVER_DESC,
.id_table = id_table,
.num_ports = 1,
.open = ssu100_open,
.close = ssu100_close,
.attach = ssu100_attach,
.release = ssu100_release,
.dtr_rts = ssu100_dtr_rts,
.process_read_urb = ssu100_process_read_urb,
.tiocmget = ssu100_tiocmget,
.tiocmset = ssu100_tiocmset,
.get_icount = ssu100_get_icount,
.ioctl = ssu100_ioctl,
.set_termios = ssu100_set_termios,
.disconnect = usb_serial_generic_disconnect,
};
static struct usb_serial_driver * const serial_drivers[] = {
&ssu100_device, NULL
};
module_usb_serial_driver(serial_drivers, id_table);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
module_param(debug, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Debug enabled or not");
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