/* Copyright (C) 2004 - 2008 rt2x00 SourceForge Project <http://rt2x00.serialmonkey.com> 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. */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/usb.h> #include <linux/bug.h> #include "rt2x00.h" #include "rt2x00usb.h" /* * Interfacing with the HW. */ int rt2x00usb_vendor_request(struct rt2x00_dev *rt2x00dev, const u8 request, const u8 requesttype, const u16 offset, const u16 value, void *buffer, const u16 buffer_length, const int timeout) { struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev); int status; unsigned int i; unsigned int pipe = (requesttype == USB_VENDOR_REQUEST_IN) ? usb_rcvctrlpipe(usb_dev, 0) : usb_sndctrlpipe(usb_dev, 0); for (i = 0; i < REGISTER_BUSY_COUNT; i++) { status = usb_control_msg(usb_dev, pipe, request, requesttype, value, offset, buffer, buffer_length, timeout); if (status >= 0) return 0; /* * Check for errors * -ENODEV: Device has disappeared, no point continuing. * All other errors: Try again. */ else if (status == -ENODEV) break; } 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); int rt2x00usb_vendor_req_buff_lock(struct rt2x00_dev *rt2x00dev, const u8 request, const u8 requesttype, const u16 offset, void *buffer, const u16 buffer_length, const int timeout) { int status; BUG_ON(!mutex_is_locked(&rt2x00dev->usb_cache_mutex)); /* * Check for Cache availability. */ if (unlikely(!rt2x00dev->csr.cache || buffer_length > CSR_CACHE_SIZE)) { ERROR(rt2x00dev, "CSR cache not available.\n"); return -ENOMEM; } if (requesttype == USB_VENDOR_REQUEST_OUT) memcpy(rt2x00dev->csr.cache, buffer, buffer_length); status = rt2x00usb_vendor_request(rt2x00dev, request, requesttype, offset, 0, rt2x00dev->csr.cache, buffer_length, timeout); if (!status && requesttype == USB_VENDOR_REQUEST_IN) memcpy(buffer, rt2x00dev->csr.cache, buffer_length); return status; } EXPORT_SYMBOL_GPL(rt2x00usb_vendor_req_buff_lock); int rt2x00usb_vendor_request_buff(struct rt2x00_dev *rt2x00dev, const u8 request, const u8 requesttype, const u16 offset, void *buffer, const u16 buffer_length, const int timeout) { int status; mutex_lock(&rt2x00dev->usb_cache_mutex); status = rt2x00usb_vendor_req_buff_lock(rt2x00dev, request, requesttype, offset, buffer, buffer_length, timeout); mutex_unlock(&rt2x00dev->usb_cache_mutex); return status; } EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request_buff); int rt2x00usb_vendor_request_large_buff(struct rt2x00_dev *rt2x00dev, const u8 request, const u8 requesttype, const u16 offset, const void *buffer, const u16 buffer_length, const int timeout) { int status = 0; unsigned char *tb; u16 off, len, bsize; mutex_lock(&rt2x00dev->usb_cache_mutex); tb = (char *)buffer; off = offset; len = buffer_length; while (len && !status) { bsize = min_t(u16, CSR_CACHE_SIZE, len); status = rt2x00usb_vendor_req_buff_lock(rt2x00dev, request, requesttype, off, tb, bsize, timeout); tb += bsize; len -= bsize; off += bsize; } mutex_unlock(&rt2x00dev->usb_cache_mutex); return status; } EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request_large_buff); /* * TX data handlers. */ static void rt2x00usb_interrupt_txdone(struct urb *urb) { struct queue_entry *entry = (struct queue_entry *)urb->context; struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev; struct txdone_entry_desc txdesc; if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) || !test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags)) return; /* * Remove the descriptor data from the buffer. */ skb_pull(entry->skb, entry->queue->desc_size); /* * Obtain the status about this packet. * Note that when the status is 0 it does not mean the * frame was send out correctly. It only means the frame * was succesfully pushed to the hardware, we have no * way to determine the transmission status right now. * (Only indirectly by looking at the failed TX counters * in the register). */ txdesc.flags = 0; if (!urb->status) __set_bit(TXDONE_UNKNOWN, &txdesc.flags); else __set_bit(TXDONE_FAILURE, &txdesc.flags); txdesc.retry = 0; rt2x00lib_txdone(entry, &txdesc); } int rt2x00usb_write_tx_data(struct queue_entry *entry) { struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev; struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev); struct queue_entry_priv_usb *entry_priv = entry->priv_data; struct skb_frame_desc *skbdesc; u32 length; /* * Add the descriptor in front of the skb. */ skb_push(entry->skb, entry->queue->desc_size); memset(entry->skb->data, 0, entry->queue->desc_size); /* * Fill in skb descriptor */ skbdesc = get_skb_frame_desc(entry->skb); skbdesc->desc = entry->skb->data; skbdesc->desc_len = entry->queue->desc_size; /* * USB devices cannot blindly pass the skb->len as the * length of the data to usb_fill_bulk_urb. Pass the skb * to the driver to determine what the length should be. */ length = rt2x00dev->ops->lib->get_tx_data_len(rt2x00dev, entry->skb); usb_fill_bulk_urb(entry_priv->urb, usb_dev, usb_sndbulkpipe(usb_dev, 1), entry->skb->data, length, rt2x00usb_interrupt_txdone, entry); return 0; } EXPORT_SYMBOL_GPL(rt2x00usb_write_tx_data); static inline void rt2x00usb_kick_tx_entry(struct queue_entry *entry) { struct queue_entry_priv_usb *entry_priv = entry->priv_data; if (__test_and_clear_bit(ENTRY_DATA_PENDING, &entry->flags)) usb_submit_urb(entry_priv->urb, GFP_ATOMIC); } void rt2x00usb_kick_tx_queue(struct rt2x00_dev *rt2x00dev, const enum data_queue_qid qid) { struct data_queue *queue = rt2x00queue_get_queue(rt2x00dev, qid); unsigned long irqflags; unsigned int index; unsigned int index_done; unsigned int i; /* * Only protect the range we are going to loop over, * if during our loop a extra entry is set to pending * it should not be kicked during this run, since it * is part of another TX operation. */ spin_lock_irqsave(&queue->lock, irqflags); index = queue->index[Q_INDEX]; index_done = queue->index[Q_INDEX_DONE]; spin_unlock_irqrestore(&queue->lock, irqflags); /* * Start from the TX done pointer, this guarentees that we will * send out all frames in the correct order. */ if (index_done < index) { for (i = index_done; i < index; i++) rt2x00usb_kick_tx_entry(&queue->entries[i]); } else { for (i = index_done; i < queue->limit; i++) rt2x00usb_kick_tx_entry(&queue->entries[i]); for (i = 0; i < index; i++) rt2x00usb_kick_tx_entry(&queue->entries[i]); } } EXPORT_SYMBOL_GPL(rt2x00usb_kick_tx_queue); /* * RX data handlers. */ static void rt2x00usb_interrupt_rxdone(struct urb *urb) { struct queue_entry *entry = (struct queue_entry *)urb->context; struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev; struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb); u8 rxd[32]; if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) || !test_bit(ENTRY_OWNER_DEVICE_DATA, &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->queue->desc_size || urb->status) { __set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags); usb_submit_urb(urb, GFP_ATOMIC); return; } /* * Fill in desc fields of the skb descriptor */ skbdesc->desc = rxd; skbdesc->desc_len = entry->queue->desc_size; /* * Send the frame to rt2x00lib for further processing. */ rt2x00lib_rxdone(rt2x00dev, entry); } /* * Radio handlers */ void rt2x00usb_disable_radio(struct rt2x00_dev *rt2x00dev) { struct queue_entry_priv_usb *entry_priv; struct queue_entry_priv_usb_bcn *bcn_priv; struct data_queue *queue; unsigned int i; rt2x00usb_vendor_request_sw(rt2x00dev, USB_RX_CONTROL, 0, 0, REGISTER_TIMEOUT); /* * Cancel all queues. */ queue_for_each(rt2x00dev, queue) { for (i = 0; i < queue->limit; i++) { entry_priv = queue->entries[i].priv_data; usb_kill_urb(entry_priv->urb); } } /* * Kill guardian urb (if required by driver). */ if (!test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags)) return; for (i = 0; i < rt2x00dev->bcn->limit; i++) { bcn_priv = rt2x00dev->bcn->entries[i].priv_data; if (bcn_priv->guardian_urb) usb_kill_urb(bcn_priv->guardian_urb); } } EXPORT_SYMBOL_GPL(rt2x00usb_disable_radio); /* * Device initialization handlers. */ void rt2x00usb_init_rxentry(struct rt2x00_dev *rt2x00dev, struct queue_entry *entry) { struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev); struct queue_entry_priv_usb *entry_priv = entry->priv_data; usb_fill_bulk_urb(entry_priv->urb, usb_dev, usb_rcvbulkpipe(usb_dev, 1), entry->skb->data, entry->skb->len, rt2x00usb_interrupt_rxdone, entry); __set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags); usb_submit_urb(entry_priv->urb, GFP_ATOMIC); } EXPORT_SYMBOL_GPL(rt2x00usb_init_rxentry); void rt2x00usb_init_txentry(struct rt2x00_dev *rt2x00dev, struct queue_entry *entry) { entry->flags = 0; } EXPORT_SYMBOL_GPL(rt2x00usb_init_txentry); static int rt2x00usb_alloc_urb(struct rt2x00_dev *rt2x00dev, struct data_queue *queue) { struct queue_entry_priv_usb *entry_priv; struct queue_entry_priv_usb_bcn *bcn_priv; unsigned int i; for (i = 0; i < queue->limit; i++) { entry_priv = queue->entries[i].priv_data; entry_priv->urb = usb_alloc_urb(0, GFP_KERNEL); if (!entry_priv->urb) return -ENOMEM; } /* * If this is not the beacon queue or * no guardian byte was required for the beacon, * then we are done. */ if (rt2x00dev->bcn != queue || !test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags)) return 0; for (i = 0; i < queue->limit; i++) { bcn_priv = queue->entries[i].priv_data; bcn_priv->guardian_urb = usb_alloc_urb(0, GFP_KERNEL); if (!bcn_priv->guardian_urb) return -ENOMEM; } return 0; } static void rt2x00usb_free_urb(struct rt2x00_dev *rt2x00dev, struct data_queue *queue) { struct queue_entry_priv_usb *entry_priv; struct queue_entry_priv_usb_bcn *bcn_priv; unsigned int i; if (!queue->entries) return; for (i = 0; i < queue->limit; i++) { entry_priv = queue->entries[i].priv_data; usb_kill_urb(entry_priv->urb); usb_free_urb(entry_priv->urb); } /* * If this is not the beacon queue or * no guardian byte was required for the beacon, * then we are done. */ if (rt2x00dev->bcn != queue || !test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags)) return; for (i = 0; i < queue->limit; i++) { bcn_priv = queue->entries[i].priv_data; usb_kill_urb(bcn_priv->guardian_urb); usb_free_urb(bcn_priv->guardian_urb); } } int rt2x00usb_initialize(struct rt2x00_dev *rt2x00dev) { struct data_queue *queue; int status; /* * Allocate DMA */ queue_for_each(rt2x00dev, queue) { status = rt2x00usb_alloc_urb(rt2x00dev, queue); if (status) goto exit; } return 0; exit: rt2x00usb_uninitialize(rt2x00dev); return status; } EXPORT_SYMBOL_GPL(rt2x00usb_initialize); void rt2x00usb_uninitialize(struct rt2x00_dev *rt2x00dev) { struct data_queue *queue; queue_for_each(rt2x00dev, queue) rt2x00usb_free_urb(rt2x00dev, queue); } EXPORT_SYMBOL_GPL(rt2x00usb_uninitialize); /* * USB driver handlers. */ static void rt2x00usb_free_reg(struct rt2x00_dev *rt2x00dev) { kfree(rt2x00dev->rf); rt2x00dev->rf = NULL; kfree(rt2x00dev->eeprom); rt2x00dev->eeprom = NULL; kfree(rt2x00dev->csr.cache); rt2x00dev->csr.cache = NULL; } static int rt2x00usb_alloc_reg(struct rt2x00_dev *rt2x00dev) { rt2x00dev->csr.cache = kzalloc(CSR_CACHE_SIZE, GFP_KERNEL); if (!rt2x00dev->csr.cache) goto exit; rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL); if (!rt2x00dev->eeprom) goto exit; rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL); if (!rt2x00dev->rf) goto exit; return 0; exit: ERROR_PROBE("Failed to allocate registers.\n"); rt2x00usb_free_reg(rt2x00dev); return -ENOMEM; } 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->dev; rt2x00dev->ops = ops; rt2x00dev->hw = hw; mutex_init(&rt2x00dev->usb_cache_mutex); rt2x00dev->usb_maxpacket = usb_maxpacket(usb_dev, usb_sndbulkpipe(usb_dev, 1), 1); if (!rt2x00dev->usb_maxpacket) rt2x00dev->usb_maxpacket = 1; retval = rt2x00usb_alloc_reg(rt2x00dev); if (retval) goto exit_free_device; retval = rt2x00lib_probe_dev(rt2x00dev); if (retval) goto exit_free_reg; return 0; exit_free_reg: rt2x00usb_free_reg(rt2x00dev); 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); rt2x00usb_free_reg(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; rt2x00usb_free_reg(rt2x00dev); /* * 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; int retval; usb_get_dev(interface_to_usbdev(usb_intf)); retval = rt2x00usb_alloc_reg(rt2x00dev); if (retval) return retval; retval = rt2x00lib_resume(rt2x00dev); if (retval) goto exit_free_reg; return 0; exit_free_reg: rt2x00usb_free_reg(rt2x00dev); return retval; } EXPORT_SYMBOL_GPL(rt2x00usb_resume); #endif /* CONFIG_PM */ /* * rt2x00usb module information. */ MODULE_AUTHOR(DRV_PROJECT); MODULE_VERSION(DRV_VERSION); MODULE_DESCRIPTION("rt2x00 usb library"); MODULE_LICENSE("GPL");