at76c50x-usb.c

	at76_dbg(DBG_MAC80211, "%s(): changed_flags=0x%08x "
		 "total_flags=0x%08x",
		 __func__, changed_flags, *total_flags);

	flags = changed_flags & AT76_SUPPORTED_FILTERS;
	*total_flags = AT76_SUPPORTED_FILTERS;

	/* Bail out after updating flags to prevent a WARN_ON in mac80211. */
	if (priv->device_unplugged)
		return;

	/* FIXME: access to priv->promisc should be protected with
	 * priv->mtx, but it's impossible because this function needs to be
	 * atomic */

	if (flags && !priv->promisc) {
		/* mac80211 wants us to enable promiscuous mode */
		priv->promisc = 1;
	} else if (!flags && priv->promisc) {
		/* we need to disable promiscuous mode */
		priv->promisc = 0;
	} else
		return;

	ieee80211_queue_work(hw, &priv->work_set_promisc);
}

static int at76_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
			struct ieee80211_vif *vif, struct ieee80211_sta *sta,
			struct ieee80211_key_conf *key)
{
	struct at76_priv *priv = hw->priv;

	int i;

	at76_dbg(DBG_MAC80211, "%s(): cmd %d key->alg %d key->keyidx %d "
		 "key->keylen %d",
		 __func__, cmd, key->alg, key->keyidx, key->keylen);

	if (key->alg != ALG_WEP)
		return -EOPNOTSUPP;

	key->hw_key_idx = key->keyidx;

	mutex_lock(&priv->mtx);

	switch (cmd) {
	case SET_KEY:
		memcpy(priv->wep_keys[key->keyidx], key->key, key->keylen);
		priv->wep_keys_len[key->keyidx] = key->keylen;

		/* FIXME: find out how to do this properly */
		priv->wep_key_id = key->keyidx;

		break;
	case DISABLE_KEY:
	default:
		priv->wep_keys_len[key->keyidx] = 0;
		break;
	}

	priv->wep_enabled = 0;

	for (i = 0; i < WEP_KEYS; i++) {
		if (priv->wep_keys_len[i] != 0)
			priv->wep_enabled = 1;
	}

	at76_startup_device(priv);

	mutex_unlock(&priv->mtx);

	return 0;
}

static const struct ieee80211_ops at76_ops = {
	.tx = at76_mac80211_tx,
	.add_interface = at76_add_interface,
	.remove_interface = at76_remove_interface,
	.config = at76_config,
	.bss_info_changed = at76_bss_info_changed,
	.configure_filter = at76_configure_filter,
	.start = at76_mac80211_start,
	.stop = at76_mac80211_stop,
	.hw_scan = at76_hw_scan,
	.set_key = at76_set_key,
};

/* Allocate network device and initialize private data */
static struct at76_priv *at76_alloc_new_device(struct usb_device *udev)
{
	struct ieee80211_hw *hw;
	struct at76_priv *priv;

	hw = ieee80211_alloc_hw(sizeof(struct at76_priv), &at76_ops);
	if (!hw) {
		printk(KERN_ERR DRIVER_NAME ": could not register"
		       " ieee80211_hw\n");
		return NULL;
	}

	priv = hw->priv;
	priv->hw = hw;

	priv->udev = udev;

	mutex_init(&priv->mtx);
	INIT_WORK(&priv->work_set_promisc, at76_work_set_promisc);
	INIT_WORK(&priv->work_submit_rx, at76_work_submit_rx);
	INIT_DELAYED_WORK(&priv->dwork_hw_scan, at76_dwork_hw_scan);

	tasklet_init(&priv->rx_tasklet, at76_rx_tasklet, 0);

	priv->pm_mode = AT76_PM_OFF;
	priv->pm_period = 0;

	/* unit us */
	priv->hw->channel_change_time = 100000;

	return priv;
}

static int at76_alloc_urbs(struct at76_priv *priv,
			   struct usb_interface *interface)
{
	struct usb_endpoint_descriptor *endpoint, *ep_in, *ep_out;
	int i;
	int buffer_size;
	struct usb_host_interface *iface_desc;

	at76_dbg(DBG_PROC_ENTRY, "%s: ENTER", __func__);

	at76_dbg(DBG_URB, "%s: NumEndpoints %d ", __func__,
		 interface->altsetting[0].desc.bNumEndpoints);

	ep_in = NULL;
	ep_out = NULL;
	iface_desc = interface->cur_altsetting;
	for (i = 0; i < iface_desc->desc.bNumEndpoints; i++) {
		endpoint = &iface_desc->endpoint[i].desc;

		at76_dbg(DBG_URB, "%s: %d. endpoint: addr 0x%x attr 0x%x",
			 __func__, i, endpoint->bEndpointAddress,
			 endpoint->bmAttributes);

		if (!ep_in && usb_endpoint_is_bulk_in(endpoint))
			ep_in = endpoint;

		if (!ep_out && usb_endpoint_is_bulk_out(endpoint))
			ep_out = endpoint;
	}

	if (!ep_in || !ep_out) {
		dev_printk(KERN_ERR, &interface->dev,
			   "bulk endpoints missing\n");
		return -ENXIO;
	}

	priv->rx_pipe = usb_rcvbulkpipe(priv->udev, ep_in->bEndpointAddress);
	priv->tx_pipe = usb_sndbulkpipe(priv->udev, ep_out->bEndpointAddress);

	priv->rx_urb = usb_alloc_urb(0, GFP_KERNEL);
	priv->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!priv->rx_urb || !priv->tx_urb) {
		dev_printk(KERN_ERR, &interface->dev, "cannot allocate URB\n");
		return -ENOMEM;
	}

	buffer_size = sizeof(struct at76_tx_buffer) + MAX_PADDING_SIZE;
	priv->bulk_out_buffer = kmalloc(buffer_size, GFP_KERNEL);
	if (!priv->bulk_out_buffer) {
		dev_printk(KERN_ERR, &interface->dev,
			   "cannot allocate output buffer\n");
		return -ENOMEM;
	}

	at76_dbg(DBG_PROC_ENTRY, "%s: EXIT", __func__);

	return 0;
}

static struct ieee80211_rate at76_rates[] = {
	{ .bitrate = 10, .hw_value = TX_RATE_1MBIT, },
	{ .bitrate = 20, .hw_value = TX_RATE_2MBIT, },
	{ .bitrate = 55, .hw_value = TX_RATE_5_5MBIT, },
	{ .bitrate = 110, .hw_value = TX_RATE_11MBIT, },
};

static struct ieee80211_channel at76_channels[] = {
	{ .center_freq = 2412, .hw_value = 1 },
	{ .center_freq = 2417, .hw_value = 2 },
	{ .center_freq = 2422, .hw_value = 3 },
	{ .center_freq = 2427, .hw_value = 4 },
	{ .center_freq = 2432, .hw_value = 5 },
	{ .center_freq = 2437, .hw_value = 6 },
	{ .center_freq = 2442, .hw_value = 7 },
	{ .center_freq = 2447, .hw_value = 8 },
	{ .center_freq = 2452, .hw_value = 9 },
	{ .center_freq = 2457, .hw_value = 10 },
	{ .center_freq = 2462, .hw_value = 11 },
	{ .center_freq = 2467, .hw_value = 12 },
	{ .center_freq = 2472, .hw_value = 13 },
	{ .center_freq = 2484, .hw_value = 14 }
};

static struct ieee80211_supported_band at76_supported_band = {
	.channels = at76_channels,
	.n_channels = ARRAY_SIZE(at76_channels),
	.bitrates = at76_rates,
	.n_bitrates = ARRAY_SIZE(at76_rates),
};

/* Register network device and initialize the hardware */
static int at76_init_new_device(struct at76_priv *priv,
				struct usb_interface *interface)
{
	struct wiphy *wiphy;
	size_t len;
	int ret;

	/* set up the endpoint information */
	/* check out the endpoints */

	at76_dbg(DBG_DEVSTART, "USB interface: %d endpoints",
		 interface->cur_altsetting->desc.bNumEndpoints);

	ret = at76_alloc_urbs(priv, interface);
	if (ret < 0)
		goto exit;

	/* MAC address */
	ret = at76_get_hw_config(priv);
	if (ret < 0) {
		dev_printk(KERN_ERR, &interface->dev,
			   "cannot get MAC address\n");
		goto exit;
	}

	priv->domain = at76_get_reg_domain(priv->regulatory_domain);

	priv->channel = DEF_CHANNEL;
	priv->iw_mode = IW_MODE_INFRA;
	priv->rts_threshold = DEF_RTS_THRESHOLD;
	priv->frag_threshold = DEF_FRAG_THRESHOLD;
	priv->short_retry_limit = DEF_SHORT_RETRY_LIMIT;
	priv->txrate = TX_RATE_AUTO;
	priv->preamble_type = PREAMBLE_TYPE_LONG;
	priv->beacon_period = 100;
	priv->auth_mode = WLAN_AUTH_OPEN;
	priv->scan_min_time = DEF_SCAN_MIN_TIME;
	priv->scan_max_time = DEF_SCAN_MAX_TIME;
	priv->scan_mode = SCAN_TYPE_ACTIVE;
	priv->device_unplugged = 0;

	/* mac80211 initialisation */
	wiphy = priv->hw->wiphy;
	priv->hw->wiphy->max_scan_ssids = 1;
	priv->hw->wiphy->max_scan_ie_len = 0;
	priv->hw->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION);
	priv->hw->wiphy->bands[IEEE80211_BAND_2GHZ] = &at76_supported_band;
	priv->hw->flags = IEEE80211_HW_RX_INCLUDES_FCS |
			  IEEE80211_HW_SIGNAL_UNSPEC;
	priv->hw->max_signal = 100;

	SET_IEEE80211_DEV(priv->hw, &interface->dev);
	SET_IEEE80211_PERM_ADDR(priv->hw, priv->mac_addr);

	len = sizeof(wiphy->fw_version);
	snprintf(wiphy->fw_version, len, "%d.%d.%d-%d",
		 priv->fw_version.major, priv->fw_version.minor,
		 priv->fw_version.patch, priv->fw_version.build);

	wiphy->hw_version = priv->board_type;

	ret = ieee80211_register_hw(priv->hw);
	if (ret) {
		printk(KERN_ERR "cannot register mac80211 hw (status %d)!\n",
		       ret);
		goto exit;
	}

	priv->mac80211_registered = 1;

	printk(KERN_INFO "%s: USB %s, MAC %pM, firmware %d.%d.%d-%d\n",
	       wiphy_name(priv->hw->wiphy),
	       dev_name(&interface->dev), priv->mac_addr,
	       priv->fw_version.major, priv->fw_version.minor,
	       priv->fw_version.patch, priv->fw_version.build);
	printk(KERN_INFO "%s: regulatory domain 0x%02x: %s\n",
	       wiphy_name(priv->hw->wiphy),
	       priv->regulatory_domain, priv->domain->name);

exit:
	return ret;
}

static void at76_delete_device(struct at76_priv *priv)
{
	at76_dbg(DBG_PROC_ENTRY, "%s: ENTER", __func__);

	/* The device is gone, don't bother turning it off */
	priv->device_unplugged = 1;

	tasklet_kill(&priv->rx_tasklet);

	if (priv->mac80211_registered)
		ieee80211_unregister_hw(priv->hw);

	if (priv->tx_urb) {
		usb_kill_urb(priv->tx_urb);
		usb_free_urb(priv->tx_urb);
	}
	if (priv->rx_urb) {
		usb_kill_urb(priv->rx_urb);
		usb_free_urb(priv->rx_urb);
	}

	at76_dbg(DBG_PROC_ENTRY, "%s: unlinked urbs", __func__);

	kfree(priv->bulk_out_buffer);

	del_timer_sync(&ledtrig_tx_timer);

	kfree_skb(priv->rx_skb);

	usb_put_dev(priv->udev);

	at76_dbg(DBG_PROC_ENTRY, "%s: before freeing priv/ieee80211_hw",
		 __func__);
	ieee80211_free_hw(priv->hw);

	at76_dbg(DBG_PROC_ENTRY, "%s: EXIT", __func__);
}

static int at76_probe(struct usb_interface *interface,
		      const struct usb_device_id *id)
{
	int ret;
	struct at76_priv *priv;
	struct fwentry *fwe;
	struct usb_device *udev;
	int op_mode;
	int need_ext_fw = 0;
	struct mib_fw_version fwv;
	int board_type = (int)id->driver_info;

	udev = usb_get_dev(interface_to_usbdev(interface));

	/* Load firmware into kernel memory */
	fwe = at76_load_firmware(udev, board_type);
	if (!fwe) {
		ret = -ENOENT;
		goto error;
	}

	op_mode = at76_get_op_mode(udev);

	at76_dbg(DBG_DEVSTART, "opmode %d", op_mode);

	/* we get OPMODE_NONE with 2.4.23, SMC2662W-AR ???
	   we get 204 with 2.4.23, Fiberline FL-WL240u (505A+RFMD2958) ??? */

	if (op_mode == OPMODE_HW_CONFIG_MODE) {
		dev_printk(KERN_ERR, &interface->dev,
			   "cannot handle a device in HW_CONFIG_MODE\n");
		ret = -EBUSY;
		goto error;
	}

	if (op_mode != OPMODE_NORMAL_NIC_WITH_FLASH
	    && op_mode != OPMODE_NORMAL_NIC_WITHOUT_FLASH) {
		/* download internal firmware part */
		dev_printk(KERN_DEBUG, &interface->dev,
			   "downloading internal firmware\n");
		ret = at76_load_internal_fw(udev, fwe);
		if (ret < 0) {
			dev_printk(KERN_ERR, &interface->dev,
				   "error %d downloading internal firmware\n",
				   ret);
			goto error;
		}
		usb_put_dev(udev);
		return ret;
	}

	/* Internal firmware already inside the device.  Get firmware
	 * version to test if external firmware is loaded.
	 * This works only for newer firmware, e.g. the Intersil 0.90.x
	 * says "control timeout on ep0in" and subsequent
	 * at76_get_op_mode() fail too :-( */

	/* if version >= 0.100.x.y or device with built-in flash we can
	 * query the device for the fw version */
	if ((fwe->fw_version.major > 0 || fwe->fw_version.minor >= 100)
	    || (op_mode == OPMODE_NORMAL_NIC_WITH_FLASH)) {
		ret = at76_get_mib(udev, MIB_FW_VERSION, &fwv, sizeof(fwv));
		if (ret < 0 || (fwv.major | fwv.minor) == 0)
			need_ext_fw = 1;
	} else
		/* No way to check firmware version, reload to be sure */
		need_ext_fw = 1;

	if (need_ext_fw) {
		dev_printk(KERN_DEBUG, &interface->dev,
			   "downloading external firmware\n");

		ret = at76_load_external_fw(udev, fwe);
		if (ret)
			goto error;

		/* Re-check firmware version */
		ret = at76_get_mib(udev, MIB_FW_VERSION, &fwv, sizeof(fwv));
		if (ret < 0) {
			dev_printk(KERN_ERR, &interface->dev,
				   "error %d getting firmware version\n", ret);
			goto error;
		}
	}

	priv = at76_alloc_new_device(udev);
	if (!priv) {
		ret = -ENOMEM;
		goto error;
	}

	usb_set_intfdata(interface, priv);

	memcpy(&priv->fw_version, &fwv, sizeof(struct mib_fw_version));
	priv->board_type = board_type;

	ret = at76_init_new_device(priv, interface);
	if (ret < 0)
		at76_delete_device(priv);

	return ret;

error:
	usb_put_dev(udev);
	return ret;
}

static void at76_disconnect(struct usb_interface *interface)
{
	struct at76_priv *priv;

	priv = usb_get_intfdata(interface);
	usb_set_intfdata(interface, NULL);

	/* Disconnect after loading internal firmware */
	if (!priv)
		return;

	printk(KERN_INFO "%s: disconnecting\n", wiphy_name(priv->hw->wiphy));
	at76_delete_device(priv);
	dev_printk(KERN_INFO, &interface->dev, "disconnected\n");
}

/* Structure for registering this driver with the USB subsystem */
static struct usb_driver at76_driver = {
	.name = DRIVER_NAME,
	.probe = at76_probe,
	.disconnect = at76_disconnect,
	.id_table = dev_table,
};

static int __init at76_mod_init(void)
{
	int result;

	printk(KERN_INFO DRIVER_DESC " " DRIVER_VERSION " loading\n");

	mutex_init(&fw_mutex);

	/* register this driver with the USB subsystem */
	result = usb_register(&at76_driver);
	if (result < 0)
		printk(KERN_ERR DRIVER_NAME
		       ": usb_register failed (status %d)\n", result);

	led_trigger_register_simple("at76_usb-tx", &ledtrig_tx);
	return result;
}

static void __exit at76_mod_exit(void)
{
	int i;

	printk(KERN_INFO DRIVER_DESC " " DRIVER_VERSION " unloading\n");
	usb_deregister(&at76_driver);
	for (i = 0; i < ARRAY_SIZE(firmwares); i++) {
		if (firmwares[i].fw)
			release_firmware(firmwares[i].fw);
	}
	led_trigger_unregister_simple(ledtrig_tx);
}

module_param_named(debug, at76_debug, uint, 0600);
MODULE_PARM_DESC(debug, "Debugging level");

module_init(at76_mod_init);
module_exit(at76_mod_exit);

MODULE_AUTHOR("Oliver Kurth <oku@masqmail.cx>");
MODULE_AUTHOR("Joerg Albert <joerg.albert@gmx.de>");
MODULE_AUTHOR("Alex <alex@foogod.com>");
MODULE_AUTHOR("Nick Jones");
MODULE_AUTHOR("Balint Seeber <n0_5p4m_p13453@hotmail.com>");
MODULE_AUTHOR("Pavel Roskin <proski@gnu.org>");
MODULE_AUTHOR("Guido Guenther <agx@sigxcpu.org>");
MODULE_AUTHOR("Kalle Valo <kalle.valo@iki.fi>");
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");