tty: Modem functions for the HSO driver (542f5482) · Commits · e / devices / android_kernel_fairphone_FP4

drivers/net/usb/hso.c

+318 −13

Original line number	Diff line number	Diff line
		@@ -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 @@ static struct hso_device hso_create_net_device(struct usb_interface interface)
		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,