/* Copyright (C) 2004 - 2007 rt2x00 SourceForge Project This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ /* Module: rt2x00usb Abstract: rt2x00 generic usb device routines. Supported chipsets: rt2570, rt2571W & rt2671. */ /* * Set enviroment defines for rt2x00.h */ #define DRV_NAME "rt2x00usb" #include #include #include #include #include #include "rt2x00.h" #include "rt2x00lib.h" #include "rt2x00usb.h" /* * Interfacing with the HW. */ int rt2x00usb_vendor_request(const struct rt2x00_dev *rt2x00dev, const u8 request, const u8 type, const u16 offset, u32 value, void *buffer, const u16 buffer_length, const u16 timeout) { struct usb_device *usb_dev = interface_to_usbdev( rt2x00dev_usb(rt2x00dev)); int status; unsigned int i; for (i = 0; i < REGISTER_BUSY_COUNT; i++) { status = usb_control_msg( usb_dev, (type == USB_VENDOR_REQUEST_IN) ? usb_rcvctrlpipe(usb_dev, 0) : usb_sndctrlpipe(usb_dev, 0), request, type, value, offset, buffer, buffer_length, timeout); if (status >= 0) return 0; } ERROR(rt2x00dev, "Vendor Request 0x%02x failed for offset 0x%04x" " with error %d.\n", request, offset, status); return status; } EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request); /* * Beacon handlers. */ int rt2x00usb_beacon_update(struct ieee80211_hw *hw, struct sk_buff *skb, struct ieee80211_tx_control *control) { struct rt2x00_dev *rt2x00dev = hw->priv; struct usb_device *usb_dev = interface_to_usbdev(rt2x00dev_usb(rt2x00dev)); struct data_ring *ring = rt2x00_get_ring(rt2x00dev, IEEE80211_TX_QUEUE_BEACON); struct data_entry *beacon; struct data_entry *guardian; int length; /* * Just in case the ieee80211 doesn't set this, * but we need this queue set for the descriptor * initialization. */ control->queue = IEEE80211_TX_QUEUE_BEACON; /* * Obtain 2 entries, one for the guardian byte, * the second for the actual beacon. */ guardian = rt2x00_get_data_entry(ring); rt2x00_ring_index_inc(ring); beacon = rt2x00_get_data_entry(ring); /* * First we create the beacon. */ skb_push(skb, ring->desc_size); rt2x00lib_write_tx_desc(rt2x00dev, beacon, (struct data_desc*)skb->data, (struct ieee80211_hdr*)(skb->data + ring->desc_size), skb->len - ring->desc_size, control); /* * Length passed to usb_fill_urb cannot be an odd number, * so add 1 byte to make it even. */ length = skb->len; if (length % 2) length++; usb_fill_bulk_urb( beacon->priv, usb_dev, usb_sndbulkpipe(usb_dev, 1), skb->data, length, rt2x00usb_beacondone, beacon); beacon->skb = skb; /* * Second we need to create the guardian byte. * We only need a single byte, so lets recycle * the 'flags' field we are not using for beacons. */ guardian->flags = 0; usb_fill_bulk_urb( guardian->priv, usb_dev, usb_sndbulkpipe(usb_dev, 1), &guardian->flags, 1, rt2x00usb_beacondone, guardian); /* * Send out the guardian byte. */ usb_submit_urb(guardian->priv, GFP_ATOMIC); /* * Enable beacon generation. */ rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev, control->queue); return 0; } EXPORT_SYMBOL_GPL(rt2x00usb_beacon_update); void rt2x00usb_beacondone(struct urb *urb) { struct data_entry *entry = (struct data_entry*)urb->context; struct data_ring *ring = entry->ring; if (!test_bit(DEVICE_ENABLED_RADIO, &ring->rt2x00dev->flags)) return; /* * Check if this was the guardian beacon, * if that was the case we need to send the real beacon now. * Otherwise we should free the sk_buffer, the device * should be doing the rest of the work now. */ if (ring->index == 1) { rt2x00_ring_index_done_inc(ring); entry = rt2x00_get_data_entry(ring); usb_submit_urb(entry->priv, GFP_ATOMIC); rt2x00_ring_index_inc(ring); } else if (ring->index_done == 1) { entry = rt2x00_get_data_entry_done(ring); if (entry->skb) { dev_kfree_skb(entry->skb); entry->skb = NULL; } rt2x00_ring_index_done_inc(ring); } } EXPORT_SYMBOL_GPL(rt2x00usb_beacondone); /* * TX data handlers. */ static void rt2x00usb_interrupt_txdone(struct urb *urb) { struct data_entry *entry = (struct data_entry*)urb->context; struct data_ring *ring = entry->ring; struct rt2x00_dev *rt2x00dev = ring->rt2x00dev; struct data_desc *txd = (struct data_desc *)entry->skb->data; u32 word; int tx_status; if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) || !__test_and_clear_bit(ENTRY_OWNER_NIC, &entry->flags)) return; rt2x00_desc_read(txd, 0, &word); /* * Remove the descriptor data from the buffer. */ skb_pull(entry->skb, ring->desc_size); /* * Obtain the status about this packet. */ tx_status = !urb->status ? TX_SUCCESS : TX_FAIL_RETRY; rt2x00lib_txdone(entry, tx_status, 0); /* * Make this entry available for reuse. */ entry->flags = 0; rt2x00_ring_index_done_inc(entry->ring); /* * If the data ring was full before the txdone handler * we must make sure the packet queue in the mac80211 stack * is reenabled when the txdone handler has finished. */ if (!rt2x00_ring_full(ring)) ieee80211_wake_queue(rt2x00dev->hw, entry->tx_status.control.queue); } int rt2x00usb_write_tx_data(struct rt2x00_dev *rt2x00dev, struct data_ring *ring, struct sk_buff *skb, struct ieee80211_tx_control *control) { struct usb_device *usb_dev = interface_to_usbdev(rt2x00dev_usb(rt2x00dev)); struct ieee80211_hdr *ieee80211hdr = (struct ieee80211_hdr*)skb->data; struct data_entry *entry = rt2x00_get_data_entry(ring); struct data_desc *txd; u32 length = skb->len; if (rt2x00_ring_full(ring)) { ieee80211_stop_queue(rt2x00dev->hw, control->queue); return -EINVAL; } if (test_bit(ENTRY_OWNER_NIC, &entry->flags)) { ERROR(rt2x00dev, "Arrived at non-free entry in the non-full queue %d.\n" "Please file bug report to %s.\n", control->queue, DRV_PROJECT); ieee80211_stop_queue( rt2x00dev->hw, control->queue); return -EINVAL; } skb_push(skb, rt2x00dev->hw->extra_tx_headroom); txd = (struct data_desc*)skb->data; rt2x00lib_write_tx_desc(rt2x00dev, entry, txd, ieee80211hdr, length, control); memcpy(&entry->tx_status.control, control, sizeof(*control)); entry->skb = skb; /* * Length passed to usb_fill_urb cannot be an odd number, * so add 1 byte to make it even. */ length += rt2x00dev->hw->extra_tx_headroom; if (length % 2) length++; __set_bit(ENTRY_OWNER_NIC, &entry->flags); usb_fill_bulk_urb( entry->priv, usb_dev, usb_sndbulkpipe(usb_dev, 1), skb->data, length, rt2x00usb_interrupt_txdone, entry); usb_submit_urb(entry->priv, GFP_ATOMIC); rt2x00_ring_index_inc(ring); if (rt2x00_ring_full(ring)) ieee80211_stop_queue(rt2x00dev->hw, control->queue); return 0; } EXPORT_SYMBOL_GPL(rt2x00usb_write_tx_data); /* * RX data handlers. */ static void rt2x00usb_interrupt_rxdone(struct urb *urb) { struct data_entry *entry = (struct data_entry*)urb->context; struct data_ring *ring = entry->ring; struct rt2x00_dev *rt2x00dev = ring->rt2x00dev; int signal; int rssi; int ofdm; int size; if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) || !test_and_clear_bit(ENTRY_OWNER_NIC, &entry->flags)) return; /* * Check if the received data is simply too small * to be actually valid, or if the urb is signaling * a problem. */ if (urb->actual_length < entry->ring->desc_size || urb->status) goto skip_entry; size = rt2x00dev->ops->lib->fill_rxdone(entry, &signal, &rssi, &ofdm); if (size < 0) goto skip_entry; /* * Trim the skb_buffer to only contain the valid * frame data (so ignore the device's descriptor). */ skb_trim(entry->skb, size); /* * Send the packet to upper layer, and update urb. */ rt2x00lib_rxdone(entry, NULL, ring->data_size + ring->desc_size, signal, rssi, ofdm); urb->transfer_buffer = entry->skb->data; urb->transfer_buffer_length = entry->skb->len; skip_entry: if (test_bit(DEVICE_ENABLED_RADIO, &ring->rt2x00dev->flags)) { __set_bit(ENTRY_OWNER_NIC, &entry->flags); usb_submit_urb(urb, GFP_ATOMIC); } rt2x00_ring_index_inc(ring); } /* * Radio handlers */ void rt2x00usb_enable_radio(struct rt2x00_dev *rt2x00dev) { struct usb_device *usb_dev = interface_to_usbdev(rt2x00dev_usb(rt2x00dev)); struct data_ring *ring; struct data_entry *entry; unsigned int i; /* * Initialize the TX rings */ txringall_for_each(rt2x00dev, ring) { for (i = 0; i < ring->stats.limit; i++) ring->entry[i].flags = 0; rt2x00_ring_index_clear(ring); } /* * Initialize and start the RX ring. */ rt2x00_ring_index_clear(rt2x00dev->rx); for (i = 0; i < rt2x00dev->rx->stats.limit; i++) { entry = &rt2x00dev->rx->entry[i]; usb_fill_bulk_urb( entry->priv, usb_dev, usb_rcvbulkpipe(usb_dev, 1), entry->skb->data, entry->skb->len, rt2x00usb_interrupt_rxdone, entry); __set_bit(ENTRY_OWNER_NIC, &entry->flags); usb_submit_urb(entry->priv, GFP_ATOMIC); } } EXPORT_SYMBOL_GPL(rt2x00usb_enable_radio); void rt2x00usb_disable_radio(struct rt2x00_dev *rt2x00dev) { struct data_ring *ring; unsigned int i; rt2x00usb_vendor_request(rt2x00dev, USB_RX_CONTROL, USB_VENDOR_REQUEST_OUT, 0x00, 0x00, NULL, 0, REGISTER_TIMEOUT); /* * Cancel all rings. */ ring_for_each(rt2x00dev, ring) { for (i = 0; i < ring->stats.limit; i++) usb_kill_urb(ring->entry[i].priv); } } EXPORT_SYMBOL_GPL(rt2x00usb_disable_radio); /* * Device initialization handlers. */ static int rt2x00usb_alloc_ring(struct rt2x00_dev *rt2x00dev, struct data_ring *ring) { unsigned int i; /* * Allocate the URB's */ for (i = 0; i < ring->stats.limit; i++) { ring->entry[i].priv = usb_alloc_urb(0, GFP_KERNEL); if (!ring->entry[i].priv) return -ENOMEM; } return 0; } int rt2x00usb_initialize(struct rt2x00_dev *rt2x00dev) { struct data_ring *ring; struct sk_buff *skb; unsigned int entry_size; unsigned int i; int status; /* * Allocate DMA */ ring_for_each(rt2x00dev, ring) { status = rt2x00usb_alloc_ring(rt2x00dev, ring); if (status) goto exit; } /* * For the RX ring, skb's should be allocated. */ entry_size = ring->data_size + ring->desc_size; for (i = 0; i < rt2x00dev->rx->stats.limit; i++) { skb = dev_alloc_skb(NET_IP_ALIGN + entry_size); if (!skb) goto exit; skb_reserve(skb, NET_IP_ALIGN); skb_put(skb, entry_size); rt2x00dev->rx->entry[i].skb = skb; } return 0; exit: rt2x00usb_uninitialize(rt2x00dev); return status; } EXPORT_SYMBOL_GPL(rt2x00usb_initialize); void rt2x00usb_uninitialize(struct rt2x00_dev *rt2x00dev) { struct data_ring *ring; unsigned int i; ring_for_each(rt2x00dev, ring) { if (!ring->entry) continue; for (i = 0; i < ring->stats.limit; i++) { usb_kill_urb(ring->entry[i].priv); usb_free_urb(ring->entry[i].priv); if (ring->entry[i].skb) kfree_skb(ring->entry[i].skb); } } } EXPORT_SYMBOL_GPL(rt2x00usb_uninitialize); /* * USB driver handlers. */ int rt2x00usb_probe(struct usb_interface *usb_intf, const struct usb_device_id *id) { struct usb_device *usb_dev = interface_to_usbdev(usb_intf); struct rt2x00_ops *ops = (struct rt2x00_ops*)id->driver_info; struct ieee80211_hw *hw; struct rt2x00_dev *rt2x00dev; int retval; usb_dev = usb_get_dev(usb_dev); hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw); if (!hw) { ERROR_PROBE("Failed to allocate hardware.\n"); retval = -ENOMEM; goto exit_put_device; } usb_set_intfdata(usb_intf, hw); rt2x00dev = hw->priv; rt2x00dev->dev = usb_intf; rt2x00dev->ops = ops; rt2x00dev->hw = hw; retval = rt2x00lib_probe_dev(rt2x00dev); if (retval) goto exit_free_device; return 0; exit_free_device: ieee80211_free_hw(hw); exit_put_device: usb_put_dev(usb_dev); usb_set_intfdata(usb_intf, NULL); return retval; } EXPORT_SYMBOL_GPL(rt2x00usb_probe); void rt2x00usb_disconnect(struct usb_interface *usb_intf) { struct ieee80211_hw *hw = usb_get_intfdata(usb_intf); struct rt2x00_dev *rt2x00dev = hw->priv; /* * Free all allocated data. */ rt2x00lib_remove_dev(rt2x00dev); ieee80211_free_hw(hw); /* * Free the USB device data. */ usb_set_intfdata(usb_intf, NULL); usb_put_dev(interface_to_usbdev(usb_intf)); } EXPORT_SYMBOL_GPL(rt2x00usb_disconnect); #ifdef CONFIG_PM int rt2x00usb_suspend(struct usb_interface *usb_intf, pm_message_t state) { struct ieee80211_hw *hw = usb_get_intfdata(usb_intf); struct rt2x00_dev *rt2x00dev = hw->priv; int retval; retval = rt2x00lib_suspend(rt2x00dev, state); if (retval) return retval; /* * Decrease usbdev refcount. */ usb_put_dev(interface_to_usbdev(usb_intf)); return 0; } EXPORT_SYMBOL_GPL(rt2x00usb_suspend); int rt2x00usb_resume(struct usb_interface *usb_intf) { struct ieee80211_hw *hw = usb_get_intfdata(usb_intf); struct rt2x00_dev *rt2x00dev = hw->priv; usb_get_dev(interface_to_usbdev(usb_intf)); return rt2x00lib_resume(rt2x00dev); } EXPORT_SYMBOL_GPL(rt2x00usb_resume); #endif /* CONFIG_PM */ /* * rt2x00pci module information. */ MODULE_AUTHOR(DRV_PROJECT); MODULE_VERSION(DRV_VERSION); MODULE_DESCRIPTION("rt2x00 library"); MODULE_LICENSE("GPL");