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path: root/drivers/net/wireless/rt2x00/rt2x00usb.c
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Diffstat (limited to 'drivers/net/wireless/rt2x00/rt2x00usb.c')
-rw-r--r--drivers/net/wireless/rt2x00/rt2x00usb.c592
1 files changed, 592 insertions, 0 deletions
diff --git a/drivers/net/wireless/rt2x00/rt2x00usb.c b/drivers/net/wireless/rt2x00/rt2x00usb.c
new file mode 100644
index 0000000..73cc726
--- /dev/null
+++ b/drivers/net/wireless/rt2x00/rt2x00usb.c
@@ -0,0 +1,592 @@
+/*
+ Copyright (C) 2004 - 2007 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.
+ */
+
+/*
+ * Set enviroment defines for rt2x00.h
+ */
+#define DRV_NAME "rt2x00usb"
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/usb.h>
+
+#include "rt2x00.h"
+#include "rt2x00usb.h"
+
+/*
+ * Interfacing with the HW.
+ */
+int rt2x00usb_vendor_request(const 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 =
+ interface_to_usbdev(rt2x00dev_usb(rt2x00dev));
+ 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_request_buff(const struct rt2x00_dev *rt2x00dev,
+ const u8 request, const u8 requesttype,
+ const u16 offset, void *buffer,
+ const u16 buffer_length, const int timeout)
+{
+ int status;
+
+ /*
+ * 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_request_buff);
+
+/*
+ * 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 data_entry *entry = rt2x00_get_data_entry(ring);
+ int pipe = usb_sndbulkpipe(usb_dev, 1);
+ int max_packet = usb_maxpacket(usb_dev, pipe, 1);
+ u32 length;
+
+ 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;
+ }
+
+ /*
+ * Add the descriptor in front of the skb.
+ */
+ skb_push(skb, ring->desc_size);
+ memset(skb->data, 0, ring->desc_size);
+
+ rt2x00lib_write_tx_desc(rt2x00dev, (struct data_desc *)skb->data,
+ (struct ieee80211_hdr *)(skb->data +
+ ring->desc_size),
+ skb->len - ring->desc_size, control);
+ memcpy(&entry->tx_status.control, control, sizeof(*control));
+ entry->skb = skb;
+
+ /*
+ * 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,
+ max_packet, skb);
+
+ /*
+ * Initialize URB and send the frame to the device.
+ */
+ __set_bit(ENTRY_OWNER_NIC, &entry->flags);
+ usb_fill_bulk_urb(entry->priv, usb_dev, pipe,
+ 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;
+ struct sk_buff *skb;
+ struct rxdata_entry_desc desc;
+ int frame_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;
+
+ memset(&desc, 0x00, sizeof(desc));
+ rt2x00dev->ops->lib->fill_rxdone(entry, &desc);
+
+ /*
+ * Allocate a new sk buffer to replace the current one.
+ * If allocation fails, we should drop the current frame
+ * so we can recycle the existing sk buffer for the new frame.
+ */
+ frame_size = entry->ring->data_size + entry->ring->desc_size;
+ skb = dev_alloc_skb(frame_size + NET_IP_ALIGN);
+ if (!skb)
+ goto skip_entry;
+
+ skb_reserve(skb, NET_IP_ALIGN);
+ skb_put(skb, frame_size);
+
+ /*
+ * Trim the skb_buffer to only contain the valid
+ * frame data (so ignore the device's descriptor).
+ */
+ skb_trim(entry->skb, desc.size);
+
+ /*
+ * Send the frame to rt2x00lib for further processing.
+ */
+ rt2x00lib_rxdone(entry, entry->skb, &desc);
+
+ /*
+ * Replace current entry's skb with the newly allocated one,
+ * and reinitialize the urb.
+ */
+ entry->skb = skb;
+ 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_sw(rt2x00dev, USB_RX_CONTROL, 0x0000, 0x0000,
+ 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_urb(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;
+}
+
+static void rt2x00usb_free_urb(struct rt2x00_dev *rt2x00dev,
+ struct data_ring *ring)
+{
+ unsigned int i;
+
+ if (!ring->entry)
+ return;
+
+ 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);
+ }
+}
+
+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_urb(rt2x00dev, ring);
+ if (status)
+ goto exit;
+ }
+
+ /*
+ * For the RX ring, skb's should be allocated.
+ */
+ entry_size = rt2x00dev->rx->data_size + rt2x00dev->rx->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;
+
+ ring_for_each(rt2x00dev, ring)
+ rt2x00usb_free_urb(rt2x00dev, ring);
+}
+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;
+ rt2x00dev->ops = ops;
+ rt2x00dev->hw = hw;
+
+ 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 */
+
+/*
+ * rt2x00pci module information.
+ */
+MODULE_AUTHOR(DRV_PROJECT);
+MODULE_VERSION(DRV_VERSION);
+MODULE_DESCRIPTION("rt2x00 library");
+MODULE_LICENSE("GPL");
generated by cgit v1.1 at 2024-10-30 13:52:12 +0000