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: Denis Joseph Barrow <D.Barow@option.com> Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>hifive-unleashed-5.1
Denis Joseph Barrow
Linus Torvalds
parent
ac9720c37e
commit
542f548236
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@ -39,8 +39,11 @@
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* port is opened, as this have a huge impact on the network port
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* throughput.
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*
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* Interface 2: Standard modem interface - circuit switched interface, should
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* not be used.
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* Interface 2: Standard modem interface - circuit switched interface, this
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* can be used to make a standard ppp connection however it
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* should not be used in conjunction with the IP network interface
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* enabled for USB performance reasons i.e. if using this set
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* ideally disable_net=1.
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*
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*****************************************************************************/
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@ -63,6 +66,8 @@
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#include <linux/usb/cdc.h>
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#include <net/arp.h>
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#include <asm/byteorder.h>
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#include <linux/serial_core.h>
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#include <linux/serial.h>
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#define DRIVER_VERSION "1.2"
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@ -182,6 +187,41 @@ enum rx_ctrl_state{
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RX_PENDING
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};
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#define BM_REQUEST_TYPE (0xa1)
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#define B_NOTIFICATION (0x20)
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#define W_VALUE (0x0)
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#define W_INDEX (0x2)
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#define W_LENGTH (0x2)
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#define B_OVERRUN (0x1<<6)
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#define B_PARITY (0x1<<5)
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#define B_FRAMING (0x1<<4)
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#define B_RING_SIGNAL (0x1<<3)
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#define B_BREAK (0x1<<2)
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#define B_TX_CARRIER (0x1<<1)
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#define B_RX_CARRIER (0x1<<0)
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struct hso_serial_state_notification {
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u8 bmRequestType;
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u8 bNotification;
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u16 wValue;
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u16 wIndex;
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u16 wLength;
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u16 UART_state_bitmap;
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} __attribute__((packed));
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struct hso_tiocmget {
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struct mutex mutex;
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wait_queue_head_t waitq;
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int intr_completed;
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struct usb_endpoint_descriptor *endp;
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struct urb *urb;
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struct hso_serial_state_notification serial_state_notification;
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u16 prev_UART_state_bitmap;
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struct uart_icount icount;
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};
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struct hso_serial {
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struct hso_device *parent;
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int magic;
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@ -219,6 +259,7 @@ struct hso_serial {
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spinlock_t serial_lock;
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int (*write_data) (struct hso_serial *serial);
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struct hso_tiocmget *tiocmget;
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/* Hacks required to get flow control
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* working on the serial receive buffers
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* so as not to drop characters on the floor.
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@ -305,7 +346,7 @@ static void async_get_intf(struct work_struct *data);
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static void async_put_intf(struct work_struct *data);
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static int hso_put_activity(struct hso_device *hso_dev);
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static int hso_get_activity(struct hso_device *hso_dev);
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static void tiocmget_intr_callback(struct urb *urb);
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/*****************************************************************************/
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/* Helping functions */
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/*****************************************************************************/
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@ -1419,25 +1460,217 @@ static int hso_serial_chars_in_buffer(struct tty_struct *tty)
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return chars;
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}
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int tiocmget_submit_urb(struct hso_serial *serial,
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struct hso_tiocmget *tiocmget,
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struct usb_device *usb)
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{
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int result;
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if (serial->parent->usb_gone)
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return -ENODEV;
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usb_fill_int_urb(tiocmget->urb, usb,
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usb_rcvintpipe(usb,
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tiocmget->endp->
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bEndpointAddress & 0x7F),
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&tiocmget->serial_state_notification,
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sizeof(struct hso_serial_state_notification),
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tiocmget_intr_callback, serial,
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tiocmget->endp->bInterval);
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result = usb_submit_urb(tiocmget->urb, GFP_ATOMIC);
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if (result) {
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dev_warn(&usb->dev, "%s usb_submit_urb failed %d\n", __func__,
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result);
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}
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return result;
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}
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static void tiocmget_intr_callback(struct urb *urb)
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{
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struct hso_serial *serial = urb->context;
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struct hso_tiocmget *tiocmget;
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int status = urb->status;
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u16 UART_state_bitmap, prev_UART_state_bitmap;
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struct uart_icount *icount;
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struct hso_serial_state_notification *serial_state_notification;
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struct usb_device *usb;
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/* Sanity checks */
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if (!serial)
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return;
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if (status) {
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log_usb_status(status, __func__);
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return;
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}
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tiocmget = serial->tiocmget;
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if (!tiocmget)
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return;
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usb = serial->parent->usb;
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serial_state_notification = &tiocmget->serial_state_notification;
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if (serial_state_notification->bmRequestType != BM_REQUEST_TYPE ||
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serial_state_notification->bNotification != B_NOTIFICATION ||
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le16_to_cpu(serial_state_notification->wValue) != W_VALUE ||
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le16_to_cpu(serial_state_notification->wIndex) != W_INDEX ||
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le16_to_cpu(serial_state_notification->wLength) != W_LENGTH) {
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dev_warn(&usb->dev,
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"hso received invalid serial state notification\n");
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DUMP(serial_state_notification,
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sizeof(hso_serial_state_notifation))
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} else {
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UART_state_bitmap = le16_to_cpu(serial_state_notification->
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UART_state_bitmap);
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prev_UART_state_bitmap = tiocmget->prev_UART_state_bitmap;
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icount = &tiocmget->icount;
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spin_lock(&serial->serial_lock);
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if ((UART_state_bitmap & B_OVERRUN) !=
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(prev_UART_state_bitmap & B_OVERRUN))
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icount->parity++;
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if ((UART_state_bitmap & B_PARITY) !=
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(prev_UART_state_bitmap & B_PARITY))
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icount->parity++;
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if ((UART_state_bitmap & B_FRAMING) !=
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(prev_UART_state_bitmap & B_FRAMING))
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icount->frame++;
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if ((UART_state_bitmap & B_RING_SIGNAL) &&
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!(prev_UART_state_bitmap & B_RING_SIGNAL))
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icount->rng++;
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if ((UART_state_bitmap & B_BREAK) !=
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(prev_UART_state_bitmap & B_BREAK))
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icount->brk++;
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if ((UART_state_bitmap & B_TX_CARRIER) !=
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(prev_UART_state_bitmap & B_TX_CARRIER))
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icount->dsr++;
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if ((UART_state_bitmap & B_RX_CARRIER) !=
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(prev_UART_state_bitmap & B_RX_CARRIER))
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icount->dcd++;
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tiocmget->prev_UART_state_bitmap = UART_state_bitmap;
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spin_unlock(&serial->serial_lock);
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tiocmget->intr_completed = 1;
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wake_up_interruptible(&tiocmget->waitq);
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}
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memset(serial_state_notification, 0,
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sizeof(struct hso_serial_state_notification));
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tiocmget_submit_urb(serial,
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tiocmget,
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serial->parent->usb);
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}
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/*
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* next few functions largely stolen from drivers/serial/serial_core.c
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*/
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/* Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
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* - mask passed in arg for lines of interest
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* (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
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* Caller should use TIOCGICOUNT to see which one it was
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*/
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static int
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hso_wait_modem_status(struct hso_serial *serial, unsigned long arg)
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{
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DECLARE_WAITQUEUE(wait, current);
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struct uart_icount cprev, cnow;
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struct hso_tiocmget *tiocmget;
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int ret;
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tiocmget = serial->tiocmget;
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if (!tiocmget)
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return -ENOENT;
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/*
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* note the counters on entry
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*/
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spin_lock_irq(&serial->serial_lock);
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memcpy(&cprev, &tiocmget->icount, sizeof(struct uart_icount));
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spin_unlock_irq(&serial->serial_lock);
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add_wait_queue(&tiocmget->waitq, &wait);
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for (;;) {
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spin_lock_irq(&serial->serial_lock);
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memcpy(&cnow, &tiocmget->icount, sizeof(struct uart_icount));
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spin_unlock_irq(&serial->serial_lock);
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set_current_state(TASK_INTERRUPTIBLE);
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if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
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((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
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((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd))) {
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ret = 0;
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break;
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}
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schedule();
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/* see if a signal did it */
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if (signal_pending(current)) {
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ret = -ERESTARTSYS;
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break;
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}
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cprev = cnow;
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}
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current->state = TASK_RUNNING;
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remove_wait_queue(&tiocmget->waitq, &wait);
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return ret;
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}
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/*
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* Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
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* Return: write counters to the user passed counter struct
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* NB: both 1->0 and 0->1 transitions are counted except for
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* RI where only 0->1 is counted.
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*/
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static int hso_get_count(struct hso_serial *serial,
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struct serial_icounter_struct __user *icnt)
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{
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struct serial_icounter_struct icount;
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struct uart_icount cnow;
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struct hso_tiocmget *tiocmget = serial->tiocmget;
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if (!tiocmget)
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return -ENOENT;
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spin_lock_irq(&serial->serial_lock);
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memcpy(&cnow, &tiocmget->icount, sizeof(struct uart_icount));
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spin_unlock_irq(&serial->serial_lock);
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icount.cts = cnow.cts;
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icount.dsr = cnow.dsr;
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icount.rng = cnow.rng;
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icount.dcd = cnow.dcd;
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icount.rx = cnow.rx;
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icount.tx = cnow.tx;
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icount.frame = cnow.frame;
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icount.overrun = cnow.overrun;
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icount.parity = cnow.parity;
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icount.brk = cnow.brk;
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icount.buf_overrun = cnow.buf_overrun;
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return copy_to_user(icnt, &icount, sizeof(icount)) ? -EFAULT : 0;
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}
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static int hso_serial_tiocmget(struct tty_struct *tty, struct file *file)
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{
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unsigned int value;
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int retval;
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struct hso_serial *serial = get_serial_by_tty(tty);
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unsigned long flags;
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struct hso_tiocmget *tiocmget;
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u16 UART_state_bitmap;
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/* sanity check */
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if (!serial) {
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D1("no tty structures");
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return -EINVAL;
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}
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spin_lock_irqsave(&serial->serial_lock, flags);
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value = ((serial->rts_state) ? TIOCM_RTS : 0) |
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spin_lock_irq(&serial->serial_lock);
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retval = ((serial->rts_state) ? TIOCM_RTS : 0) |
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((serial->dtr_state) ? TIOCM_DTR : 0);
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spin_unlock_irqrestore(&serial->serial_lock, flags);
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tiocmget = serial->tiocmget;
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if (tiocmget) {
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return value;
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UART_state_bitmap = le16_to_cpu(
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tiocmget->prev_UART_state_bitmap);
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if (UART_state_bitmap & B_RING_SIGNAL)
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retval |= TIOCM_RNG;
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if (UART_state_bitmap & B_RX_CARRIER)
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retval |= TIOCM_CD;
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if (UART_state_bitmap & B_TX_CARRIER)
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retval |= TIOCM_DSR;
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}
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spin_unlock_irq(&serial->serial_lock);
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return retval;
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}
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static int hso_serial_tiocmset(struct tty_struct *tty, struct file *file,
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@ -1479,6 +1712,32 @@ static int hso_serial_tiocmset(struct tty_struct *tty, struct file *file,
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USB_CTRL_SET_TIMEOUT);
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}
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static int hso_serial_ioctl(struct tty_struct *tty, struct file *file,
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unsigned int cmd, unsigned long arg)
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{
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struct hso_serial *serial = get_serial_by_tty(tty);
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void __user *uarg = (void __user *)arg;
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int ret = 0;
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D4("IOCTL cmd: %d, arg: %ld", cmd, arg);
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if (!serial)
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return -ENODEV;
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switch (cmd) {
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case TIOCMIWAIT:
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ret = hso_wait_modem_status(serial, arg);
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break;
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case TIOCGICOUNT:
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ret = hso_get_count(serial, uarg);
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break;
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default:
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ret = -ENOIOCTLCMD;
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break;
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}
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return ret;
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}
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/* starts a transmit */
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static void hso_kick_transmit(struct hso_serial *serial)
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{
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@ -1956,7 +2215,10 @@ static int hso_start_serial_device(struct hso_device *hso_dev, gfp_t flags)
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serial->shared_int->use_count++;
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mutex_unlock(&serial->shared_int->shared_int_lock);
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}
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if (serial->tiocmget)
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tiocmget_submit_urb(serial,
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serial->tiocmget,
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serial->parent->usb);
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return result;
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}
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@ -1964,6 +2226,7 @@ static int hso_stop_serial_device(struct hso_device *hso_dev)
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{
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int i;
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struct hso_serial *serial = dev2ser(hso_dev);
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struct hso_tiocmget *tiocmget;
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if (!serial)
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return -ENODEV;
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@ -1992,6 +2255,11 @@ static int hso_stop_serial_device(struct hso_device *hso_dev)
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}
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mutex_unlock(&serial->shared_int->shared_int_lock);
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}
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tiocmget = serial->tiocmget;
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if (tiocmget) {
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wake_up_interruptible(&tiocmget->waitq);
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usb_kill_urb(tiocmget->urb);
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}
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return 0;
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}
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@ -2338,6 +2606,20 @@ exit:
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return NULL;
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}
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static void hso_free_tiomget(struct hso_serial *serial)
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{
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struct hso_tiocmget *tiocmget = serial->tiocmget;
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if (tiocmget) {
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kfree(tiocmget);
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if (tiocmget->urb) {
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usb_free_urb(tiocmget->urb);
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tiocmget->urb = NULL;
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}
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serial->tiocmget = NULL;
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}
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}
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/* Frees an AT channel ( goes for both mux and non-mux ) */
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static void hso_free_serial_device(struct hso_device *hso_dev)
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{
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@ -2356,6 +2638,7 @@ static void hso_free_serial_device(struct hso_device *hso_dev)
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else
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mutex_unlock(&serial->shared_int->shared_int_lock);
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}
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hso_free_tiomget(serial);
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kfree(serial);
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hso_free_device(hso_dev);
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}
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@ -2367,6 +2650,7 @@ static struct hso_device *hso_create_bulk_serial_device(
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struct hso_device *hso_dev;
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struct hso_serial *serial;
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int num_urbs;
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struct hso_tiocmget *tiocmget;
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hso_dev = hso_create_device(interface, port);
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if (!hso_dev)
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@ -2379,8 +2663,27 @@ static struct hso_device *hso_create_bulk_serial_device(
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serial->parent = hso_dev;
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hso_dev->port_data.dev_serial = serial;
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if (port & HSO_PORT_MODEM)
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if (port & HSO_PORT_MODEM) {
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num_urbs = 2;
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serial->tiocmget = kzalloc(sizeof(struct hso_tiocmget),
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GFP_KERNEL);
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/* it isn't going to break our heart if serial->tiocmget
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* allocation fails don't bother checking this.
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*/
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if (serial->tiocmget) {
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tiocmget = serial->tiocmget;
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tiocmget->urb = usb_alloc_urb(0, GFP_KERNEL);
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if (tiocmget->urb) {
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mutex_init(&tiocmget->mutex);
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init_waitqueue_head(&tiocmget->waitq);
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tiocmget->endp = hso_get_ep(
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interface,
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USB_ENDPOINT_XFER_INT,
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USB_DIR_IN);
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} else
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hso_free_tiomget(serial);
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}
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}
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else
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num_urbs = 1;
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@ -2416,6 +2719,7 @@ static struct hso_device *hso_create_bulk_serial_device(
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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,
|
||||
|
|
|
|||
Loading…
Reference in New Issue