--- /dev/null
+/*
+ Copyright (C) 2010 Willow Garage <http://www.willowgarage.com>
+ Copyright (C) 2004 - 2010 Ivo van Doorn <IvDoorn@gmail.com>
+ <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, see <http://www.gnu.org/licenses/>.
+ */
+
+/*
+ Module: rt2x00usb
+ Abstract: rt2x00 generic usb device routines.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.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 pipe =
+ (requesttype == USB_VENDOR_REQUEST_IN) ?
+ usb_rcvctrlpipe(usb_dev, 0) : usb_sndctrlpipe(usb_dev, 0);
+ unsigned long expire = jiffies + msecs_to_jiffies(timeout);
+
+ if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
+ return -ENODEV;
+
+ do {
+ status = usb_control_msg(usb_dev, pipe, request, requesttype,
+ value, offset, buffer, buffer_length,
+ timeout / 2);
+ if (status >= 0)
+ return 0;
+
+ if (status == -ENODEV) {
+ /* Device has disappeared. */
+ clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
+ break;
+ }
+ } while (time_before(jiffies, expire));
+
+ rt2x00_err(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->csr_mutex));
+
+ /*
+ * Check for Cache availability.
+ */
+ if (unlikely(!rt2x00dev->csr.cache || buffer_length > CSR_CACHE_SIZE)) {
+ rt2x00_err(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)
+{
+ int status = 0;
+ unsigned char *tb;
+ u16 off, len, bsize;
+
+ mutex_lock(&rt2x00dev->csr_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, REGISTER_TIMEOUT);
+
+ tb += bsize;
+ len -= bsize;
+ off += bsize;
+ }
+
+ mutex_unlock(&rt2x00dev->csr_mutex);
+
+ return status;
+}
+EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request_buff);
+
+int rt2x00usb_regbusy_read(struct rt2x00_dev *rt2x00dev,
+ const unsigned int offset,
+ const struct rt2x00_field32 field,
+ u32 *reg)
+{
+ unsigned int i;
+
+ if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
+ return -ENODEV;
+
+ for (i = 0; i < REGISTER_USB_BUSY_COUNT; i++) {
+ rt2x00usb_register_read_lock(rt2x00dev, offset, reg);
+ if (!rt2x00_get_field32(*reg, field))
+ return 1;
+ udelay(REGISTER_BUSY_DELAY);
+ }
+
+ rt2x00_err(rt2x00dev, "Indirect register access failed: offset=0x%.08x, value=0x%.08x\n",
+ offset, *reg);
+ *reg = ~0;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(rt2x00usb_regbusy_read);
+
+
+struct rt2x00_async_read_data {
+ __le32 reg;
+ struct usb_ctrlrequest cr;
+ struct rt2x00_dev *rt2x00dev;
+ bool (*callback)(struct rt2x00_dev *, int, u32);
+};
+
+static void rt2x00usb_register_read_async_cb(struct urb *urb)
+{
+ struct rt2x00_async_read_data *rd = urb->context;
+ if (rd->callback(rd->rt2x00dev, urb->status, le32_to_cpu(rd->reg))) {
+ if (usb_submit_urb(urb, GFP_ATOMIC) < 0)
+ kfree(rd);
+ } else
+ kfree(rd);
+}
+
+void rt2x00usb_register_read_async(struct rt2x00_dev *rt2x00dev,
+ const unsigned int offset,
+ bool (*callback)(struct rt2x00_dev*, int, u32))
+{
+ struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
+ struct urb *urb;
+ struct rt2x00_async_read_data *rd;
+
+ rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
+ if (!rd)
+ return;
+
+ urb = usb_alloc_urb(0, GFP_ATOMIC);
+ if (!urb) {
+ kfree(rd);
+ return;
+ }
+
+ rd->rt2x00dev = rt2x00dev;
+ rd->callback = callback;
+ rd->cr.bRequestType = USB_VENDOR_REQUEST_IN;
+ rd->cr.bRequest = USB_MULTI_READ;
+ rd->cr.wValue = 0;
+ rd->cr.wIndex = cpu_to_le16(offset);
+ rd->cr.wLength = cpu_to_le16(sizeof(u32));
+
+ usb_fill_control_urb(urb, usb_dev, usb_rcvctrlpipe(usb_dev, 0),
+ (unsigned char *)(&rd->cr), &rd->reg, sizeof(rd->reg),
+ rt2x00usb_register_read_async_cb, rd);
+ if (usb_submit_urb(urb, GFP_ATOMIC) < 0)
+ kfree(rd);
+ usb_free_urb(urb);
+}
+EXPORT_SYMBOL_GPL(rt2x00usb_register_read_async);
+
+/*
+ * TX data handlers.
+ */
+static void rt2x00usb_work_txdone_entry(struct queue_entry *entry)
+{
+ /*
+ * If the transfer to hardware succeeded, it does not mean the
+ * frame was send out correctly. It only means the frame
+ * was successfully 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).
+ */
+ if (test_bit(ENTRY_DATA_IO_FAILED, &entry->flags))
+ rt2x00lib_txdone_noinfo(entry, TXDONE_FAILURE);
+ else
+ rt2x00lib_txdone_noinfo(entry, TXDONE_UNKNOWN);
+}
+
+static void rt2x00usb_work_txdone(struct work_struct *work)
+{
+ struct rt2x00_dev *rt2x00dev =
+ container_of(work, struct rt2x00_dev, txdone_work);
+ struct data_queue *queue;
+ struct queue_entry *entry;
+
+ tx_queue_for_each(rt2x00dev, queue) {
+ while (!rt2x00queue_empty(queue)) {
+ entry = rt2x00queue_get_entry(queue, Q_INDEX_DONE);
+
+ if (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags) ||
+ !test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags))
+ break;
+
+ rt2x00usb_work_txdone_entry(entry);
+ }
+ }
+}
+
+static void rt2x00usb_interrupt_txdone(struct urb *urb)
+{
+ struct queue_entry *entry = (struct queue_entry *)urb->context;
+ struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
+
+ if (!test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
+ return;
+ /*
+ * Check if the frame was correctly uploaded
+ */
+ if (urb->status)
+ set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
+ /*
+ * Report the frame as DMA done
+ */
+ rt2x00lib_dmadone(entry);
+
+ if (rt2x00dev->ops->lib->tx_dma_done)
+ rt2x00dev->ops->lib->tx_dma_done(entry);
+ /*
+ * Schedule the delayed work for reading the TX status
+ * from the device.
+ */
+ if (!rt2x00_has_cap_flag(rt2x00dev, REQUIRE_TXSTATUS_FIFO) ||
+ !kfifo_is_empty(&rt2x00dev->txstatus_fifo))
+ queue_work(rt2x00dev->workqueue, &rt2x00dev->txdone_work);
+}
+
+static bool rt2x00usb_kick_tx_entry(struct queue_entry *entry, void *data)
+{
+ 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;
+ u32 length;
+ int status;
+
+ if (!test_and_clear_bit(ENTRY_DATA_PENDING, &entry->flags) ||
+ test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags))
+ return false;
+
+ /*
+ * USB devices require certain padding at the end of each frame
+ * and urb. Those paddings are not included in skbs. Pass entry
+ * to the driver to determine what the overall length should be.
+ */
+ length = rt2x00dev->ops->lib->get_tx_data_len(entry);
+
+ status = skb_padto(entry->skb, length);
+ if (unlikely(status)) {
+ /* TODO: report something more appropriate than IO_FAILED. */
+ rt2x00_warn(rt2x00dev, "TX SKB padding error, out of memory\n");
+ set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
+ rt2x00lib_dmadone(entry);
+
+ return false;
+ }
+
+ usb_fill_bulk_urb(entry_priv->urb, usb_dev,
+ usb_sndbulkpipe(usb_dev, entry->queue->usb_endpoint),
+ entry->skb->data, length,
+ rt2x00usb_interrupt_txdone, entry);
+
+ status = usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
+ if (status) {
+ if (status == -ENODEV)
+ clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
+ set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
+ rt2x00lib_dmadone(entry);
+ }
+
+ return false;
+}
+
+/*
+ * RX data handlers.
+ */
+static void rt2x00usb_work_rxdone(struct work_struct *work)
+{
+ struct rt2x00_dev *rt2x00dev =
+ container_of(work, struct rt2x00_dev, rxdone_work);
+ struct queue_entry *entry;
+ struct skb_frame_desc *skbdesc;
+ u8 rxd[32];
+
+ while (!rt2x00queue_empty(rt2x00dev->rx)) {
+ entry = rt2x00queue_get_entry(rt2x00dev->rx, Q_INDEX_DONE);
+
+ if (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags) ||
+ !test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags))
+ break;
+
+ /*
+ * Fill in desc fields of the skb descriptor
+ */
+ skbdesc = get_skb_frame_desc(entry->skb);
+ skbdesc->desc = rxd;
+ skbdesc->desc_len = entry->queue->desc_size;
+
+ /*
+ * Send the frame to rt2x00lib for further processing.
+ */
+ rt2x00lib_rxdone(entry, GFP_KERNEL);
+ }
+}
+
+static void rt2x00usb_interrupt_rxdone(struct urb *urb)
+{
+ struct queue_entry *entry = (struct queue_entry *)urb->context;
+ struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
+
+ if (!test_and_clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
+ return;
+
+ /*
+ * Report the frame as DMA done
+ */
+ rt2x00lib_dmadone(entry);
+
+ /*
+ * 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_DATA_IO_FAILED, &entry->flags);
+
+ /*
+ * Schedule the delayed work for reading the RX status
+ * from the device.
+ */
+ queue_work(rt2x00dev->workqueue, &rt2x00dev->rxdone_work);
+}
+
+static bool rt2x00usb_kick_rx_entry(struct queue_entry *entry, void *data)
+{
+ 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;
+ int status;
+
+ if (test_and_set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags) ||
+ test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags))
+ return false;
+
+ rt2x00lib_dmastart(entry);
+
+ usb_fill_bulk_urb(entry_priv->urb, usb_dev,
+ usb_rcvbulkpipe(usb_dev, entry->queue->usb_endpoint),
+ entry->skb->data, entry->skb->len,
+ rt2x00usb_interrupt_rxdone, entry);
+
+ status = usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
+ if (status) {
+ if (status == -ENODEV)
+ clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
+ set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
+ rt2x00lib_dmadone(entry);
+ }
+
+ return false;
+}
+
+void rt2x00usb_kick_queue(struct data_queue *queue)
+{
+ switch (queue->qid) {
+ case QID_AC_VO:
+ case QID_AC_VI:
+ case QID_AC_BE:
+ case QID_AC_BK:
+ if (!rt2x00queue_empty(queue))
+ rt2x00queue_for_each_entry(queue,
+ Q_INDEX_DONE,
+ Q_INDEX,
+ NULL,
+ rt2x00usb_kick_tx_entry);
+ break;
+ case QID_RX:
+ if (!rt2x00queue_full(queue))
+ rt2x00queue_for_each_entry(queue,
+ Q_INDEX,
+ Q_INDEX_DONE,
+ NULL,
+ rt2x00usb_kick_rx_entry);
+ break;
+ default:
+ break;
+ }
+}
+EXPORT_SYMBOL_GPL(rt2x00usb_kick_queue);
+
+static bool rt2x00usb_flush_entry(struct queue_entry *entry, void *data)
+{
+ struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
+ struct queue_entry_priv_usb *entry_priv = entry->priv_data;
+ struct queue_entry_priv_usb_bcn *bcn_priv = entry->priv_data;
+
+ if (!test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
+ return false;
+
+ usb_kill_urb(entry_priv->urb);
+
+ /*
+ * Kill guardian urb (if required by driver).
+ */
+ if ((entry->queue->qid == QID_BEACON) &&
+ (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_BEACON_GUARD)))
+ usb_kill_urb(bcn_priv->guardian_urb);
+
+ return false;
+}
+
+void rt2x00usb_flush_queue(struct data_queue *queue, bool drop)
+{
+ struct work_struct *completion;
+ unsigned int i;
+
+ if (drop)
+ rt2x00queue_for_each_entry(queue, Q_INDEX_DONE, Q_INDEX, NULL,
+ rt2x00usb_flush_entry);
+
+ /*
+ * Obtain the queue completion handler
+ */
+ switch (queue->qid) {
+ case QID_AC_VO:
+ case QID_AC_VI:
+ case QID_AC_BE:
+ case QID_AC_BK:
+ completion = &queue->rt2x00dev->txdone_work;
+ break;
+ case QID_RX:
+ completion = &queue->rt2x00dev->rxdone_work;
+ break;
+ default:
+ return;
+ }
+
+ for (i = 0; i < 10; i++) {
+ /*
+ * Check if the driver is already done, otherwise we
+ * have to sleep a little while to give the driver/hw
+ * the oppurtunity to complete interrupt process itself.
+ */
+ if (rt2x00queue_empty(queue))
+ break;
+
+ /*
+ * Schedule the completion handler manually, when this
+ * worker function runs, it should cleanup the queue.
+ */
+ queue_work(queue->rt2x00dev->workqueue, completion);
+
+ /*
+ * Wait for a little while to give the driver
+ * the oppurtunity to recover itself.
+ */
+ msleep(10);
+ }
+}
+EXPORT_SYMBOL_GPL(rt2x00usb_flush_queue);
+
+static void rt2x00usb_watchdog_tx_dma(struct data_queue *queue)
+{
+ rt2x00_warn(queue->rt2x00dev, "TX queue %d DMA timed out, invoke forced forced reset\n",
+ queue->qid);
+
+ rt2x00queue_stop_queue(queue);
+ rt2x00queue_flush_queue(queue, true);
+ rt2x00queue_start_queue(queue);
+}
+
+static int rt2x00usb_dma_timeout(struct data_queue *queue)
+{
+ struct queue_entry *entry;
+
+ entry = rt2x00queue_get_entry(queue, Q_INDEX_DMA_DONE);
+ return rt2x00queue_dma_timeout(entry);
+}
+
+void rt2x00usb_watchdog(struct rt2x00_dev *rt2x00dev)
+{
+ struct data_queue *queue;
+
+ tx_queue_for_each(rt2x00dev, queue) {
+ if (!rt2x00queue_empty(queue)) {
+ if (rt2x00usb_dma_timeout(queue))
+ rt2x00usb_watchdog_tx_dma(queue);
+ }
+ }
+}
+EXPORT_SYMBOL_GPL(rt2x00usb_watchdog);
+
+/*
+ * Radio handlers
+ */
+void rt2x00usb_disable_radio(struct rt2x00_dev *rt2x00dev)
+{
+ rt2x00usb_vendor_request_sw(rt2x00dev, USB_RX_CONTROL, 0, 0,
+ REGISTER_TIMEOUT);
+}
+EXPORT_SYMBOL_GPL(rt2x00usb_disable_radio);
+
+/*
+ * Device initialization handlers.
+ */
+void rt2x00usb_clear_entry(struct queue_entry *entry)
+{
+ entry->flags = 0;
+
+ if (entry->queue->qid == QID_RX)
+ rt2x00usb_kick_rx_entry(entry, NULL);
+}
+EXPORT_SYMBOL_GPL(rt2x00usb_clear_entry);
+
+static void rt2x00usb_assign_endpoint(struct data_queue *queue,
+ struct usb_endpoint_descriptor *ep_desc)
+{
+ struct usb_device *usb_dev = to_usb_device_intf(queue->rt2x00dev->dev);
+ int pipe;
+
+ queue->usb_endpoint = usb_endpoint_num(ep_desc);
+
+ if (queue->qid == QID_RX) {
+ pipe = usb_rcvbulkpipe(usb_dev, queue->usb_endpoint);
+ queue->usb_maxpacket = usb_maxpacket(usb_dev, pipe, 0);
+ } else {
+ pipe = usb_sndbulkpipe(usb_dev, queue->usb_endpoint);
+ queue->usb_maxpacket = usb_maxpacket(usb_dev, pipe, 1);
+ }
+
+ if (!queue->usb_maxpacket)
+ queue->usb_maxpacket = 1;
+}
+
+static int rt2x00usb_find_endpoints(struct rt2x00_dev *rt2x00dev)
+{
+ struct usb_interface *intf = to_usb_interface(rt2x00dev->dev);
+ struct usb_host_interface *intf_desc = intf->cur_altsetting;
+ struct usb_endpoint_descriptor *ep_desc;
+ struct data_queue *queue = rt2x00dev->tx;
+ struct usb_endpoint_descriptor *tx_ep_desc = NULL;
+ unsigned int i;
+
+ /*
+ * Walk through all available endpoints to search for "bulk in"
+ * and "bulk out" endpoints. When we find such endpoints collect
+ * the information we need from the descriptor and assign it
+ * to the queue.
+ */
+ for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) {
+ ep_desc = &intf_desc->endpoint[i].desc;
+
+ if (usb_endpoint_is_bulk_in(ep_desc)) {
+ rt2x00usb_assign_endpoint(rt2x00dev->rx, ep_desc);
+ } else if (usb_endpoint_is_bulk_out(ep_desc) &&
+ (queue != queue_end(rt2x00dev))) {
+ rt2x00usb_assign_endpoint(queue, ep_desc);
+ queue = queue_next(queue);
+
+ tx_ep_desc = ep_desc;
+ }
+ }
+
+ /*
+ * At least 1 endpoint for RX and 1 endpoint for TX must be available.
+ */
+ if (!rt2x00dev->rx->usb_endpoint || !rt2x00dev->tx->usb_endpoint) {
+ rt2x00_err(rt2x00dev, "Bulk-in/Bulk-out endpoints not found\n");
+ return -EPIPE;
+ }
+
+ /*
+ * It might be possible not all queues have a dedicated endpoint.
+ * Loop through all TX queues and copy the endpoint information
+ * which we have gathered from already assigned endpoints.
+ */
+ txall_queue_for_each(rt2x00dev, queue) {
+ if (!queue->usb_endpoint)
+ rt2x00usb_assign_endpoint(queue, tx_ep_desc);
+ }
+
+ return 0;
+}
+
+static int rt2x00usb_alloc_entries(struct data_queue *queue)
+{
+ struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
+ 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 (queue->qid != QID_BEACON ||
+ !rt2x00_has_cap_flag(rt2x00dev, REQUIRE_BEACON_GUARD))
+ 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_entries(struct data_queue *queue)
+{
+ struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
+ 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 (queue->qid != QID_BEACON ||
+ !rt2x00_has_cap_flag(rt2x00dev, REQUIRE_BEACON_GUARD))
+ 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;
+
+ /*
+ * Find endpoints for each queue
+ */
+ status = rt2x00usb_find_endpoints(rt2x00dev);
+ if (status)
+ goto exit;
+
+ /*
+ * Allocate DMA
+ */
+ queue_for_each(rt2x00dev, queue) {
+ status = rt2x00usb_alloc_entries(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_entries(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:
+ rt2x00_probe_err("Failed to allocate registers\n");
+
+ rt2x00usb_free_reg(rt2x00dev);
+
+ return -ENOMEM;
+}
+
+int rt2x00usb_probe(struct usb_interface *usb_intf,
+ const struct rt2x00_ops *ops)
+{
+ struct usb_device *usb_dev = interface_to_usbdev(usb_intf);
+ struct ieee80211_hw *hw;
+ struct rt2x00_dev *rt2x00dev;
+ int retval;
+
+ usb_dev = usb_get_dev(usb_dev);
+ usb_reset_device(usb_dev);
+
+ hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
+ if (!hw) {
+ rt2x00_probe_err("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;
+
+ rt2x00_set_chip_intf(rt2x00dev, RT2X00_CHIP_INTF_USB);
+
+ INIT_WORK(&rt2x00dev->rxdone_work, rt2x00usb_work_rxdone);
+ INIT_WORK(&rt2x00dev->txdone_work, rt2x00usb_work_txdone);
+ hrtimer_init(&rt2x00dev->txstatus_timer, CLOCK_MONOTONIC,
+ HRTIMER_MODE_REL);
+
+ 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;
+
+ return rt2x00lib_suspend(rt2x00dev, state);
+}
+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;
+
+ return rt2x00lib_resume(rt2x00dev);
+}
+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");
Code Review / kvmfornfv.git / blobdiff