Commit 542f5482 authored by Denis Joseph Barrow's avatar Denis Joseph Barrow Committed by Linus Torvalds
Browse files

tty: Modem functions for the HSO driver



Makes TIOCM ioctls for Data Carrier Detect & related functions
work like /drivers/serial/serial-core.c potentially needed
for pppd & similar user programs.
Signed-off-by: default avatarDenis Joseph Barrow <D.Barow@option.com>
Signed-off-by: default avatarAlan Cox <alan@redhat.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent ac9720c3
......@@ -39,8 +39,11 @@
* port is opened, as this have a huge impact on the network port
* throughput.
*
* Interface 2: Standard modem interface - circuit switched interface, should
* not be used.
* Interface 2: Standard modem interface - circuit switched interface, this
* can be used to make a standard ppp connection however it
* should not be used in conjunction with the IP network interface
* enabled for USB performance reasons i.e. if using this set
* ideally disable_net=1.
*
*****************************************************************************/
......@@ -63,6 +66,8 @@
#include <linux/usb/cdc.h>
#include <net/arp.h>
#include <asm/byteorder.h>
#include <linux/serial_core.h>
#include <linux/serial.h>
#define DRIVER_VERSION "1.2"
......@@ -182,6 +187,41 @@ enum rx_ctrl_state{
RX_PENDING
};
#define BM_REQUEST_TYPE (0xa1)
#define B_NOTIFICATION (0x20)
#define W_VALUE (0x0)
#define W_INDEX (0x2)
#define W_LENGTH (0x2)
#define B_OVERRUN (0x1<<6)
#define B_PARITY (0x1<<5)
#define B_FRAMING (0x1<<4)
#define B_RING_SIGNAL (0x1<<3)
#define B_BREAK (0x1<<2)
#define B_TX_CARRIER (0x1<<1)
#define B_RX_CARRIER (0x1<<0)
struct hso_serial_state_notification {
u8 bmRequestType;
u8 bNotification;
u16 wValue;
u16 wIndex;
u16 wLength;
u16 UART_state_bitmap;
} __attribute__((packed));
struct hso_tiocmget {
struct mutex mutex;
wait_queue_head_t waitq;
int intr_completed;
struct usb_endpoint_descriptor *endp;
struct urb *urb;
struct hso_serial_state_notification serial_state_notification;
u16 prev_UART_state_bitmap;
struct uart_icount icount;
};
struct hso_serial {
struct hso_device *parent;
int magic;
......@@ -219,6 +259,7 @@ struct hso_serial {
spinlock_t serial_lock;
int (*write_data) (struct hso_serial *serial);
struct hso_tiocmget *tiocmget;
/* Hacks required to get flow control
* working on the serial receive buffers
* so as not to drop characters on the floor.
......@@ -305,7 +346,7 @@ static void async_get_intf(struct work_struct *data);
static void async_put_intf(struct work_struct *data);
static int hso_put_activity(struct hso_device *hso_dev);
static int hso_get_activity(struct hso_device *hso_dev);
static void tiocmget_intr_callback(struct urb *urb);
/*****************************************************************************/
/* Helping functions */
/*****************************************************************************/
......@@ -1419,25 +1460,217 @@ static int hso_serial_chars_in_buffer(struct tty_struct *tty)
return chars;
}
int tiocmget_submit_urb(struct hso_serial *serial,
struct hso_tiocmget *tiocmget,
struct usb_device *usb)
{
int result;
if (serial->parent->usb_gone)
return -ENODEV;
usb_fill_int_urb(tiocmget->urb, usb,
usb_rcvintpipe(usb,
tiocmget->endp->
bEndpointAddress & 0x7F),
&tiocmget->serial_state_notification,
sizeof(struct hso_serial_state_notification),
tiocmget_intr_callback, serial,
tiocmget->endp->bInterval);
result = usb_submit_urb(tiocmget->urb, GFP_ATOMIC);
if (result) {
dev_warn(&usb->dev, "%s usb_submit_urb failed %d\n", __func__,
result);
}
return result;
}
static void tiocmget_intr_callback(struct urb *urb)
{
struct hso_serial *serial = urb->context;
struct hso_tiocmget *tiocmget;
int status = urb->status;
u16 UART_state_bitmap, prev_UART_state_bitmap;
struct uart_icount *icount;
struct hso_serial_state_notification *serial_state_notification;
struct usb_device *usb;
/* Sanity checks */
if (!serial)
return;
if (status) {
log_usb_status(status, __func__);
return;
}
tiocmget = serial->tiocmget;
if (!tiocmget)
return;
usb = serial->parent->usb;
serial_state_notification = &tiocmget->serial_state_notification;
if (serial_state_notification->bmRequestType != BM_REQUEST_TYPE ||
serial_state_notification->bNotification != B_NOTIFICATION ||
le16_to_cpu(serial_state_notification->wValue) != W_VALUE ||
le16_to_cpu(serial_state_notification->wIndex) != W_INDEX ||
le16_to_cpu(serial_state_notification->wLength) != W_LENGTH) {
dev_warn(&usb->dev,
"hso received invalid serial state notification\n");
DUMP(serial_state_notification,
sizeof(hso_serial_state_notifation))
} else {
UART_state_bitmap = le16_to_cpu(serial_state_notification->
UART_state_bitmap);
prev_UART_state_bitmap = tiocmget->prev_UART_state_bitmap;
icount = &tiocmget->icount;
spin_lock(&serial->serial_lock);
if ((UART_state_bitmap & B_OVERRUN) !=
(prev_UART_state_bitmap & B_OVERRUN))
icount->parity++;
if ((UART_state_bitmap & B_PARITY) !=
(prev_UART_state_bitmap & B_PARITY))
icount->parity++;
if ((UART_state_bitmap & B_FRAMING) !=
(prev_UART_state_bitmap & B_FRAMING))
icount->frame++;
if ((UART_state_bitmap & B_RING_SIGNAL) &&
!(prev_UART_state_bitmap & B_RING_SIGNAL))
icount->rng++;
if ((UART_state_bitmap & B_BREAK) !=
(prev_UART_state_bitmap & B_BREAK))
icount->brk++;
if ((UART_state_bitmap & B_TX_CARRIER) !=
(prev_UART_state_bitmap & B_TX_CARRIER))
icount->dsr++;
if ((UART_state_bitmap & B_RX_CARRIER) !=
(prev_UART_state_bitmap & B_RX_CARRIER))
icount->dcd++;
tiocmget->prev_UART_state_bitmap = UART_state_bitmap;
spin_unlock(&serial->serial_lock);
tiocmget->intr_completed = 1;
wake_up_interruptible(&tiocmget->waitq);
}
memset(serial_state_notification, 0,
sizeof(struct hso_serial_state_notification));
tiocmget_submit_urb(serial,
tiocmget,
serial->parent->usb);
}
/*
* next few functions largely stolen from drivers/serial/serial_core.c
*/
/* Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
* - mask passed in arg for lines of interest
* (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
* Caller should use TIOCGICOUNT to see which one it was
*/
static int
hso_wait_modem_status(struct hso_serial *serial, unsigned long arg)
{
DECLARE_WAITQUEUE(wait, current);
struct uart_icount cprev, cnow;
struct hso_tiocmget *tiocmget;
int ret;
tiocmget = serial->tiocmget;
if (!tiocmget)
return -ENOENT;
/*
* note the counters on entry
*/
spin_lock_irq(&serial->serial_lock);
memcpy(&cprev, &tiocmget->icount, sizeof(struct uart_icount));
spin_unlock_irq(&serial->serial_lock);
add_wait_queue(&tiocmget->waitq, &wait);
for (;;) {
spin_lock_irq(&serial->serial_lock);
memcpy(&cnow, &tiocmget->icount, sizeof(struct uart_icount));
spin_unlock_irq(&serial->serial_lock);
set_current_state(TASK_INTERRUPTIBLE);
if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd))) {
ret = 0;
break;
}
schedule();
/* see if a signal did it */
if (signal_pending(current)) {
ret = -ERESTARTSYS;
break;
}
cprev = cnow;
}
current->state = TASK_RUNNING;
remove_wait_queue(&tiocmget->waitq, &wait);
return ret;
}
/*
* Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
* Return: write counters to the user passed counter struct
* NB: both 1->0 and 0->1 transitions are counted except for
* RI where only 0->1 is counted.
*/
static int hso_get_count(struct hso_serial *serial,
struct serial_icounter_struct __user *icnt)
{
struct serial_icounter_struct icount;
struct uart_icount cnow;
struct hso_tiocmget *tiocmget = serial->tiocmget;
if (!tiocmget)
return -ENOENT;
spin_lock_irq(&serial->serial_lock);
memcpy(&cnow, &tiocmget->icount, sizeof(struct uart_icount));
spin_unlock_irq(&serial->serial_lock);
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 copy_to_user(icnt, &icount, sizeof(icount)) ? -EFAULT : 0;
}
static int hso_serial_tiocmget(struct tty_struct *tty, struct file *file)
{
unsigned int value;
int retval;
struct hso_serial *serial = get_serial_by_tty(tty);
unsigned long flags;
struct hso_tiocmget *tiocmget;
u16 UART_state_bitmap;
/* sanity check */
if (!serial) {
D1("no tty structures");
return -EINVAL;
}
spin_lock_irqsave(&serial->serial_lock, flags);
value = ((serial->rts_state) ? TIOCM_RTS : 0) |
spin_lock_irq(&serial->serial_lock);
retval = ((serial->rts_state) ? TIOCM_RTS : 0) |
((serial->dtr_state) ? TIOCM_DTR : 0);
spin_unlock_irqrestore(&serial->serial_lock, flags);
return value;
tiocmget = serial->tiocmget;
if (tiocmget) {
UART_state_bitmap = le16_to_cpu(
tiocmget->prev_UART_state_bitmap);
if (UART_state_bitmap & B_RING_SIGNAL)
retval |= TIOCM_RNG;
if (UART_state_bitmap & B_RX_CARRIER)
retval |= TIOCM_CD;
if (UART_state_bitmap & B_TX_CARRIER)
retval |= TIOCM_DSR;
}
spin_unlock_irq(&serial->serial_lock);
return retval;
}
static int hso_serial_tiocmset(struct tty_struct *tty, struct file *file,
......@@ -1479,6 +1712,32 @@ static int hso_serial_tiocmset(struct tty_struct *tty, struct file *file,
USB_CTRL_SET_TIMEOUT);
}
static int hso_serial_ioctl(struct tty_struct *tty, struct file *file,
unsigned int cmd, unsigned long arg)
{
struct hso_serial *serial = get_serial_by_tty(tty);
void __user *uarg = (void __user *)arg;
int ret = 0;
D4("IOCTL cmd: %d, arg: %ld", cmd, arg);
if (!serial)
return -ENODEV;
switch (cmd) {
case TIOCMIWAIT:
ret = hso_wait_modem_status(serial, arg);
break;
case TIOCGICOUNT:
ret = hso_get_count(serial, uarg);
break;
default:
ret = -ENOIOCTLCMD;
break;
}
return ret;
}
/* starts a transmit */
static void hso_kick_transmit(struct hso_serial *serial)
{
......@@ -1956,7 +2215,10 @@ static int hso_start_serial_device(struct hso_device *hso_dev, gfp_t flags)
serial->shared_int->use_count++;
mutex_unlock(&serial->shared_int->shared_int_lock);
}
if (serial->tiocmget)
tiocmget_submit_urb(serial,
serial->tiocmget,
serial->parent->usb);
return result;
}
......@@ -1964,6 +2226,7 @@ static int hso_stop_serial_device(struct hso_device *hso_dev)
{
int i;
struct hso_serial *serial = dev2ser(hso_dev);
struct hso_tiocmget *tiocmget;
if (!serial)
return -ENODEV;
......@@ -1992,6 +2255,11 @@ static int hso_stop_serial_device(struct hso_device *hso_dev)
}
mutex_unlock(&serial->shared_int->shared_int_lock);
}
tiocmget = serial->tiocmget;
if (tiocmget) {
wake_up_interruptible(&tiocmget->waitq);
usb_kill_urb(tiocmget->urb);
}
return 0;
}
......@@ -2338,6 +2606,20 @@ exit:
return NULL;
}
static void hso_free_tiomget(struct hso_serial *serial)
{
struct hso_tiocmget *tiocmget = serial->tiocmget;
if (tiocmget) {
kfree(tiocmget);
if (tiocmget->urb) {
usb_free_urb(tiocmget->urb);
tiocmget->urb = NULL;
}
serial->tiocmget = NULL;
}
}
/* Frees an AT channel ( goes for both mux and non-mux ) */
static void hso_free_serial_device(struct hso_device *hso_dev)
{
......@@ -2356,6 +2638,7 @@ static void hso_free_serial_device(struct hso_device *hso_dev)
else
mutex_unlock(&serial->shared_int->shared_int_lock);
}
hso_free_tiomget(serial);
kfree(serial);
hso_free_device(hso_dev);
}
......@@ -2367,6 +2650,7 @@ static struct hso_device *hso_create_bulk_serial_device(
struct hso_device *hso_dev;
struct hso_serial *serial;
int num_urbs;
struct hso_tiocmget *tiocmget;
hso_dev = hso_create_device(interface, port);
if (!hso_dev)
......@@ -2379,8 +2663,27 @@ static struct hso_device *hso_create_bulk_serial_device(
serial->parent = hso_dev;
hso_dev->port_data.dev_serial = serial;
if (port & HSO_PORT_MODEM)
if (port & HSO_PORT_MODEM) {
num_urbs = 2;
serial->tiocmget = kzalloc(sizeof(struct hso_tiocmget),
GFP_KERNEL);
/* it isn't going to break our heart if serial->tiocmget
* allocation fails don't bother checking this.
*/
if (serial->tiocmget) {
tiocmget = serial->tiocmget;
tiocmget->urb = usb_alloc_urb(0, GFP_KERNEL);
if (tiocmget->urb) {
mutex_init(&tiocmget->mutex);
init_waitqueue_head(&tiocmget->waitq);
tiocmget->endp = hso_get_ep(
interface,
USB_ENDPOINT_XFER_INT,
USB_DIR_IN);
} else
hso_free_tiomget(serial);
}
}
else
num_urbs = 1;
......@@ -2416,6 +2719,7 @@ static struct hso_device *hso_create_bulk_serial_device(
exit2:
hso_serial_common_free(serial);
exit:
hso_free_tiomget(serial);
kfree(serial);
hso_free_device(hso_dev);
return NULL;
......@@ -2926,6 +3230,7 @@ static const struct tty_operations hso_serial_ops = {
.close = hso_serial_close,
.write = hso_serial_write,
.write_room = hso_serial_write_room,
.ioctl = hso_serial_ioctl,
.set_termios = hso_serial_set_termios,
.chars_in_buffer = hso_serial_chars_in_buffer,
.tiocmget = hso_serial_tiocmget,
......
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