diff options
| -rw-r--r-- | drivers/net/usb/hso.c | 329 |
1 files changed, 317 insertions, 12 deletions
diff --git a/drivers/net/usb/hso.c b/drivers/net/usb/hso.c index cc37a2e67177..fd723dc79c50 100644 --- a/drivers/net/usb/hso.c +++ b/drivers/net/usb/hso.c @@ -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. @@ -310,7 +351,7 @@ 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 */ /*****************************************************************************/ @@ -1460,25 +1501,217 @@ 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); + tiocmget = serial->tiocmget; + if (tiocmget) { - return value; + 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, @@ -1520,6 +1753,32 @@ 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) { @@ -1982,7 +2241,10 @@ 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; } @@ -1990,6 +2252,7 @@ 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; @@ -2018,6 +2281,11 @@ 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; } @@ -2368,6 +2636,20 @@ 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) { @@ -2386,6 +2668,7 @@ 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); } @@ -2397,6 +2680,7 @@ 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) @@ -2409,8 +2693,27 @@ 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; @@ -2446,6 +2749,7 @@ 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; @@ -2958,6 +3262,7 @@ 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, |