/*
 * Symbol USB barcode to serial driver
 *
 * Copyright (C) 2013 Johan Hovold <jhovold@gmail.com>
 * Copyright (C) 2009 Greg Kroah-Hartman <gregkh@suse.de>
 * Copyright (C) 2009 Novell Inc.
 *
 *	This program is free software; you can redistribute it and/or
 *	modify it under the terms of the GNU General Public License version
 *	2 as published by the Free Software Foundation.
 */

#include <linux/kernel.h>
#include <linux/tty.h>
#include <linux/slab.h>
#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
#include <linux/module.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>
#include <linux/uaccess.h>

static const struct usb_device_id id_table[] = {
	{ USB_DEVICE(0x05e0, 0x0600) },
	{ },
};
MODULE_DEVICE_TABLE(usb, id_table);

struct symbol_private {
	spinlock_t lock;	/* protects the following flags */
	bool throttled;
	bool actually_throttled;
};

static void symbol_int_callback(struct urb *urb)
{
	struct usb_serial_port *port = urb->context;
	struct symbol_private *priv = usb_get_serial_port_data(port);
	unsigned char *data = urb->transfer_buffer;
	int status = urb->status;
	int result;
	int data_length;

	switch (status) {
	case 0:
		/* success */
		break;
	case -ECONNRESET:
	case -ENOENT:
	case -ESHUTDOWN:
		/* this urb is terminated, clean up */
		dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
			__func__, status);
		return;
	default:
		dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
			__func__, status);
		goto exit;
	}

	usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);

	/*
	 * Data from the device comes with a 1 byte header:
	 *
	 * <size of data> <data>...
	 */
	if (urb->actual_length > 1) {
		data_length = data[0];
		if (data_length > (urb->actual_length - 1))
			data_length = urb->actual_length - 1;
		tty_insert_flip_string(&port->port, &data[1], data_length);
		tty_flip_buffer_push(&port->port);
	} else {
		dev_dbg(&port->dev, "%s - short packet\n", __func__);
	}

exit:
	spin_lock(&priv->lock);

	/* Continue trying to always read if we should */
	if (!priv->throttled) {
		result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
		if (result)
			dev_err(&port->dev,
			    "%s - failed resubmitting read urb, error %d\n",
							__func__, result);
	} else
		priv->actually_throttled = true;
	spin_unlock(&priv->lock);
}

static int symbol_open(struct tty_struct *tty, struct usb_serial_port *port)
{
	struct symbol_private *priv = usb_get_serial_port_data(port);
	unsigned long flags;
	int result = 0;

	spin_lock_irqsave(&priv->lock, flags);
	priv->throttled = false;
	priv->actually_throttled = false;
	spin_unlock_irqrestore(&priv->lock, flags);

	/* Start reading from the device */
	result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
	if (result)
		dev_err(&port->dev,
			"%s - failed resubmitting read urb, error %d\n",
			__func__, result);
	return result;
}

static void symbol_close(struct usb_serial_port *port)
{
	usb_kill_urb(port->interrupt_in_urb);
}

static void symbol_throttle(struct tty_struct *tty)
{
	struct usb_serial_port *port = tty->driver_data;
	struct symbol_private *priv = usb_get_serial_port_data(port);

	spin_lock_irq(&priv->lock);
	priv->throttled = true;
	spin_unlock_irq(&priv->lock);
}

static void symbol_unthrottle(struct tty_struct *tty)
{
	struct usb_serial_port *port = tty->driver_data;
	struct symbol_private *priv = usb_get_serial_port_data(port);
	int result;
	bool was_throttled;

	spin_lock_irq(&priv->lock);
	priv->throttled = false;
	was_throttled = priv->actually_throttled;
	priv->actually_throttled = false;
	spin_unlock_irq(&priv->lock);

	if (was_throttled) {
		result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
		if (result)
			dev_err(&port->dev,
				"%s - failed submitting read urb, error %d\n",
							__func__, result);
	}
}

static int symbol_startup(struct usb_serial *serial)
{
	if (!serial->num_interrupt_in) {
		dev_err(&serial->dev->dev, "no interrupt-in endpoint\n");
		return -ENODEV;
	}

	return 0;
}

static int symbol_port_probe(struct usb_serial_port *port)
{
	struct symbol_private *priv;

	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	spin_lock_init(&priv->lock);

	usb_set_serial_port_data(port, priv);

	return 0;
}

static int symbol_port_remove(struct usb_serial_port *port)
{
	struct symbol_private *priv = usb_get_serial_port_data(port);

	kfree(priv);

	return 0;
}

static struct usb_serial_driver symbol_device = {
	.driver = {
		.owner =	THIS_MODULE,
		.name =		"symbol",
	},
	.id_table =		id_table,
	.num_ports =		1,
	.attach =		symbol_startup,
	.port_probe =		symbol_port_probe,
	.port_remove =		symbol_port_remove,
	.open =			symbol_open,
	.close =		symbol_close,
	.throttle = 		symbol_throttle,
	.unthrottle =		symbol_unthrottle,
	.read_int_callback =	symbol_int_callback,
};

static struct usb_serial_driver * const serial_drivers[] = {
	&symbol_device, NULL
};

module_usb_serial_driver(serial_drivers, id_table);

MODULE_LICENSE("GPL");
pan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?h=nds-private-remove&amp;id=097e46d2ae90265d1afe141ba6208ba598b79e01'>097e46d2ae90265d1afe141ba6208ba598b79e01</a> (<a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=88407beb1b1462f706a1950a355fd086e1c450b6&amp;id2=097e46d2ae90265d1afe141ba6208ba598b79e01'>diff</a>)</td></tr></table>
<div class='commit-subject'>ath10k: fix incorrect txpower set by P2P_DEVICE interface</div><div class='commit-msg'>Ath10k reports the phy capability that supports P2P_DEVICE interface.

When we use the P2P supported wpa_supplicant to start connection, it'll
create two interfaces, one is wlan0 (vdev_id=0) and one is P2P_DEVICE
p2p-dev-wlan0 which is for p2p control channel (vdev_id=1).

	ath10k_pci mac vdev create 0 (add interface) type 2 subtype 0
	ath10k_add_interface: vdev_id: 0, txpower: 0, bss_power: 0
	...
	ath10k_pci mac vdev create 1 (add interface) type 2 subtype 1
	ath10k_add_interface: vdev_id: 1, txpower: 0, bss_power: 0

And the txpower in per vif bss_conf will only be set to valid tx power when
the interface is assigned with channel_ctx.

But this P2P_DEVICE interface will never be used for any connection, so
that the uninitialized bss_conf.txpower=0 is assinged to the
arvif-&gt;txpower when interface created.

Since the txpower configuration is firmware per physical interface.
So the smallest txpower of all vifs will be the one limit the tx power
of the physical device, that causing the low txpower issue on other
active interfaces.

	wlan0: Limiting TX power to 21 (24 - 3) dBm
	ath10k_pci mac vdev_id 0 txpower 21
	ath10k_mac_txpower_recalc: vdev_id: 1, txpower: 0
	ath10k_mac_txpower_recalc: vdev_id: 0, txpower: 21
	ath10k_pci mac txpower 0

This issue only happens when we use the wpa_supplicant that supports
P2P or if we use the iw tool to create the control P2P_DEVICE interface.

Signed-off-by: Ryan Hsu &lt;ryanhsu@qca.qualcomm.com&gt;
Signed-off-by: Kalle Valo &lt;kvalo@qca.qualcomm.com&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=88407beb1b1462f706a1950a355fd086e1c450b6'>Diffstat</a></div><table summary='diffstat' class='diffstat'><tr><td class='mode'>-rw-r--r--</td><td class='upd'><a href='/cgit.cgi/linux/net-next.git/diff/drivers/net/wireless/ath/ath10k/mac.c?h=nds-private-remove&amp;id=88407beb1b1462f706a1950a355fd086e1c450b6'>drivers/net/wireless/ath/ath10k/mac.c</a></td><td class='right'>7</td><td class='graph'><table summary='file diffstat' width='7%'><tr><td class='add' style='width: 57.1%;'/><td class='rem' style='width: 42.9%;'/><td class='none' style='width: 0.0%;'/></tr></table></td></tr>
</table><div class='diffstat-summary'>1 files changed, 4 insertions, 3 deletions</div><table summary='diff' class='diff'><tr><td><div class='head'>diff --git a/drivers/net/wireless/ath/ath10k/mac.c b/drivers/net/wireless/ath/ath10k/mac.c