From 95ea36275f3c9a1d3d04c217b4b576c657c4e70e Mon Sep 17 00:00:00 2001 From: Ivo van Doorn Date: Tue, 25 Sep 2007 17:57:13 -0700 Subject: [RT2x00]: add driver for Ralink wireless hardware Signed-off-by: Ivo van Doorn Signed-off-by: John W. Linville Signed-off-by: David S. Miller --- drivers/net/wireless/rt2x00/rt2x00usb.c | 595 ++++++++++++++++++++++++++++++++ 1 file changed, 595 insertions(+) create mode 100644 drivers/net/wireless/rt2x00/rt2x00usb.c (limited to 'drivers/net/wireless/rt2x00/rt2x00usb.c') diff --git a/drivers/net/wireless/rt2x00/rt2x00usb.c b/drivers/net/wireless/rt2x00/rt2x00usb.c new file mode 100644 index 00000000000..a0f05ca54bb --- /dev/null +++ b/drivers/net/wireless/rt2x00/rt2x00usb.c @@ -0,0 +1,595 @@ +/* + 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. + */ + +/* + * Set enviroment defines for rt2x00.h + */ +#define DRV_NAME "rt2x00usb" + +#include +#include +#include + +#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, + u16 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, + * -ETIMEDOUT: We need a bit more time to complete. + * -ENODEV: Device has disappeared, no point continuing. + */ + if (status == -ETIMEDOUT) + timeout *= 2; + 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, u16 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 ieee80211_hdr *ieee80211hdr = (struct ieee80211_hdr *)skb->data; + struct data_entry *entry = rt2x00_get_data_entry(ring); + 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; + } + + /* + * Add the descriptor in front of the skb. + */ + skb_push(skb, rt2x00dev->hw->extra_tx_headroom); + memset(skb->data, 0x00, rt2x00dev->hw->extra_tx_headroom); + + rt2x00lib_write_tx_desc(rt2x00dev, (struct data_desc *)skb->data, + 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; + struct sk_buff *skb; + int retval; + int signal; + int rssi; + int ofdm; + int 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; + + retval = rt2x00dev->ops->lib->fill_rxdone(entry, &signal, &rssi, + &ofdm, &size); + if (retval) + goto skip_entry; + + /* + * 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, size); + + /* + * Send the frame to rt2x00lib for further processing. + */ + rt2x00lib_rxdone(entry, entry->skb, signal, rssi, ofdm); + + /* + * 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"); -- cgit v1.2.3