/*
Module: rt2x00usb
Abstract: rt2x00 generic usb device routines.
- Supported chipsets: rt2570, rt2571W & rt2671.
*/
/*
#include <linux/kernel.h>
#include <linux/module.h>
-#include <linux/version.h>
-#include <linux/init.h>
#include <linux/usb.h>
#include "rt2x00.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)
+ 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));
+ 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,
- (type == USB_VENDOR_REQUEST_IN) ?
- usb_rcvctrlpipe(usb_dev, 0) :
- usb_sndctrlpipe(usb_dev, 0),
- request, type, value, offset, buffer, buffer_length,
- timeout);
+ 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 error. Request 0x%02x failed "
- "for offset 0x%04x with error %d.\n", request, offset, status);
+ 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);
-/*
- * Radio handlers
- */
-void rt2x00usb_enable_radio(struct rt2x00_dev *rt2x00dev)
+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)
{
- unsigned int i;
-
- /*
- * Start the RX ring.
- */
- for (i = 0; i < rt2x00dev->rx->stats.limit; i++) {
- __set_bit(ENTRY_OWNER_NIC, &rt2x00dev->rx->entry[i].flags);
- usb_submit_urb(rt2x00dev->rx->entry[i].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);
+ int status;
/*
- * Cancel all rings.
+ * Check for Cache availability.
*/
- ring_for_each(rt2x00dev, ring) {
- for (i = 0; i < ring->stats.limit; i++)
- usb_kill_urb(ring->entry[i].priv);
+ if (unlikely(!rt2x00dev->csr_cache || buffer_length > CSR_CACHE_SIZE)) {
+ ERROR(rt2x00dev, "CSR cache not available.\n");
+ return -ENOMEM;
}
-}
-EXPORT_SYMBOL_GPL(rt2x00usb_disable_radio);
-
-/*
- * 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);
+ if (requesttype == USB_VENDOR_REQUEST_OUT)
+ memcpy(rt2x00dev->csr_cache, buffer, buffer_length);
- /*
- * Enable beacon generation.
- */
- rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev, control->queue);
+ status = rt2x00usb_vendor_request(rt2x00dev, request, requesttype,
+ offset, 0, rt2x00dev->csr_cache,
+ buffer_length, timeout);
- 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;
+ if (!status && requesttype == USB_VENDOR_REQUEST_IN)
+ memcpy(buffer, rt2x00dev->csr_cache, buffer_length);
- /*
- * 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);
- }
+ return status;
}
-EXPORT_SYMBOL_GPL(rt2x00usb_beacondone);
+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_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;
*/
if (!rt2x00_ring_full(ring))
ieee80211_wake_queue(rt2x00dev->hw,
- entry->tx_status.control.queue);
+ 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 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;
+ interface_to_usbdev(rt2x00dev_usb(rt2x00dev));
struct data_entry *entry = rt2x00_get_data_entry(ring);
- struct data_desc *txd;
- u32 length = skb->len;
+ int pipe = usb_sndbulkpipe(usb_dev, 1);
+ u32 length;
if (rt2x00_ring_full(ring)) {
ieee80211_stop_queue(rt2x00dev->hw, control->queue);
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);
+ "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);
+ /*
+ * 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;
/*
- * Length passed to usb_fill_urb cannot be an odd number,
- * so add 1 byte to make it even.
+ * 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->hw->extra_tx_headroom;
- if (length % 2)
- length++;
+ length = rt2x00dev->ops->lib->get_tx_data_len(rt2x00dev, 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,
- usb_sndbulkpipe(usb_dev, 1),
- skb->data,
- length,
- rt2x00usb_interrupt_txdone,
- entry);
+ 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);
}
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 ieee80211_hdr *hdr;
+ struct rxdata_entry_desc desc;
+ int header_size;
+ 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.
+ * As alignment we use 2 and not NET_IP_ALIGN because we need
+ * to be sure we have 2 bytes room in the head. (NET_IP_ALIGN
+ * can be 0 on some hardware). We use these 2 bytes for frame
+ * alignment later, we assume that the chance that
+ * header_size % 4 == 2 is bigger then header_size % 2 == 0
+ * and thus optimize alignment by reserving the 2 bytes in
+ * advance.
+ */
+ frame_size = entry->ring->data_size + entry->ring->desc_size;
+ skb = dev_alloc_skb(frame_size + 2);
+ if (!skb)
+ goto skip_entry;
+
+ skb_reserve(skb, 2);
+ skb_put(skb, frame_size);
+
+ /*
+ * The data behind the ieee80211 header must be
+ * aligned on a 4 byte boundary.
+ * After that trim the entire buffer down to only
+ * contain the valid frame data excluding the device
+ * descriptor.
+ */
+ hdr = (struct ieee80211_hdr *)entry->skb->data;
+ header_size =
+ ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control));
+
+ if (header_size % 4 == 0) {
+ skb_push(entry->skb, 2);
+ memmove(entry->skb->data, entry->skb->data + 2, skb->len - 2);
+ }
+ 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_ring(struct rt2x00_dev *rt2x00dev,
- struct data_ring *ring)
+static int rt2x00usb_alloc_urb(struct rt2x00_dev *rt2x00dev,
+ struct data_ring *ring)
{
unsigned int i;
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;
* Allocate DMA
*/
ring_for_each(rt2x00dev, ring) {
- status = rt2x00usb_alloc_ring(rt2x00dev, ring);
+ status = rt2x00usb_alloc_urb(rt2x00dev, ring);
if (status)
goto exit;
}
/*
* For the RX ring, skb's should be allocated.
*/
- entry_size = ring->data_size + ring->desc_size;
+ 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)
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);
- }
- }
+ 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)
+ 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 rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_info;
struct ieee80211_hw *hw;
struct rt2x00_dev *rt2x00dev;
int retval;
rt2x00dev = hw->priv;
rt2x00dev->dev = usb_intf;
- rt2x00dev->device = &usb_intf->dev;
rt2x00dev->ops = ops;
rt2x00dev->hw = hw;
- retval = rt2x00lib_probe_dev(rt2x00dev);
+ 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);
* Free all allocated data.
*/
rt2x00lib_remove_dev(rt2x00dev);
+ rt2x00usb_free_reg(rt2x00dev);
ieee80211_free_hw(hw);
/*
if (retval)
return retval;
+ rt2x00usb_free_reg(rt2x00dev);
+
/*
* Decrease usbdev refcount.
*/
{
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));
- return rt2x00lib_resume(rt2x00dev);
+ 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 */
projects / openwrt.git / blobdiff