2 * atusb.c - Driver for the ATUSB IEEE 802.15.4 dongle
4 * Written 2013 by Werner Almesberger <werner@almesberger.net>
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation, version 2
10 * Based on at86rf230.c and spi_atusb.c.
12 * Copyright (C) 2009 Siemens AG
13 * Written by: Dmitry Eremin-Solenikov <dmitry.baryshkov@siemens.com>
16 * Copyright (c) 2011 Richard Sharpe <realrichardsharpe@gmail.com>
17 * Copyright (c) 2011 Stefan Schmidt <stefan@datenfreihafen.org>
18 * Copyright (c) 2011 Werner Almesberger <werner@almesberger.net>
20 * USB initialization is
21 * Copyright (c) 2013 Alexander Aring <alex.aring@gmail.com>
24 #include <linux/kernel.h>
25 #include <linux/slab.h>
26 #include <linux/module.h>
27 #include <linux/jiffies.h>
28 #include <linux/usb.h>
29 #include <linux/skbuff.h>
31 #include <net/cfg802154.h>
32 #include <net/mac802154.h>
34 #include "at86rf230.h"
37 #define ATUSB_JEDEC_ATMEL 0x1f /* JEDEC manufacturer ID */
39 #define ATUSB_NUM_RX_URBS 4 /* allow for a bit of local latency */
40 #define ATUSB_ALLOC_DELAY_MS 100 /* delay after failed allocation */
41 #define ATUSB_TX_TIMEOUT_MS 200 /* on the air timeout */
44 struct ieee802154_hw *hw;
45 struct usb_device *usb_dev;
46 int shutdown; /* non-zero if shutting down */
47 int err; /* set by first error */
50 struct delayed_work work; /* memory allocations */
51 struct usb_anchor idle_urbs; /* URBs waiting to be submitted */
52 struct usb_anchor rx_urbs; /* URBs waiting for reception */
55 struct usb_ctrlrequest tx_dr;
57 struct sk_buff *tx_skb;
58 uint8_t tx_ack_seq; /* current TX ACK sequence number */
61 /* ----- USB commands without data ----------------------------------------- */
63 /* To reduce the number of error checks in the code, we record the first error
64 * in atusb->err and reject all subsequent requests until the error is cleared.
67 static int atusb_control_msg(struct atusb *atusb, unsigned int pipe,
68 __u8 request, __u8 requesttype,
69 __u16 value, __u16 index,
70 void *data, __u16 size, int timeout)
72 struct usb_device *usb_dev = atusb->usb_dev;
78 ret = usb_control_msg(usb_dev, pipe, request, requesttype,
79 value, index, data, size, timeout);
81 ret = ret < 0 ? ret : -ENODATA;
84 dev_err(&usb_dev->dev,
85 "atusb_control_msg: req 0x%02x val 0x%x idx 0x%x, error %d\n",
86 request, value, index, ret);
91 static int atusb_command(struct atusb *atusb, uint8_t cmd, uint8_t arg)
93 struct usb_device *usb_dev = atusb->usb_dev;
95 dev_dbg(&usb_dev->dev, "atusb_command: cmd = 0x%x\n", cmd);
96 return atusb_control_msg(atusb, usb_sndctrlpipe(usb_dev, 0),
97 cmd, ATUSB_REQ_TO_DEV, arg, 0, NULL, 0, 1000);
100 static int atusb_write_reg(struct atusb *atusb, uint8_t reg, uint8_t value)
102 struct usb_device *usb_dev = atusb->usb_dev;
104 dev_dbg(&usb_dev->dev, "atusb_write_reg: 0x%02x <- 0x%02x\n",
106 return atusb_control_msg(atusb, usb_sndctrlpipe(usb_dev, 0),
107 ATUSB_REG_WRITE, ATUSB_REQ_TO_DEV,
108 value, reg, NULL, 0, 1000);
111 static int atusb_read_reg(struct atusb *atusb, uint8_t reg)
113 struct usb_device *usb_dev = atusb->usb_dev;
118 buffer = kmalloc(1, GFP_KERNEL);
122 dev_dbg(&usb_dev->dev, "atusb: reg = 0x%x\n", reg);
123 ret = atusb_control_msg(atusb, usb_rcvctrlpipe(usb_dev, 0),
124 ATUSB_REG_READ, ATUSB_REQ_FROM_DEV,
125 0, reg, buffer, 1, 1000);
137 static int atusb_write_subreg(struct atusb *atusb, uint8_t reg, uint8_t mask,
138 uint8_t shift, uint8_t value)
140 struct usb_device *usb_dev = atusb->usb_dev;
144 dev_dbg(&usb_dev->dev, "atusb_write_subreg: 0x%02x <- 0x%02x\n",
147 orig = atusb_read_reg(atusb, reg);
149 /* Write the value only into that part of the register which is allowed
150 * by the mask. All other bits stay as before.
153 tmp |= (value << shift) & mask;
156 ret = atusb_write_reg(atusb, reg, tmp);
161 static int atusb_get_and_clear_error(struct atusb *atusb)
163 int err = atusb->err;
169 /* ----- skb allocation ---------------------------------------------------- */
172 #define MAX_RX_XFER (1 + MAX_PSDU + 2 + 1) /* PHR+PSDU+CRC+LQI */
174 #define SKB_ATUSB(skb) (*(struct atusb **)(skb)->cb)
176 static void atusb_in(struct urb *urb);
178 static int atusb_submit_rx_urb(struct atusb *atusb, struct urb *urb)
180 struct usb_device *usb_dev = atusb->usb_dev;
181 struct sk_buff *skb = urb->context;
185 skb = alloc_skb(MAX_RX_XFER, GFP_KERNEL);
187 dev_warn_ratelimited(&usb_dev->dev,
188 "atusb_in: can't allocate skb\n");
191 skb_put(skb, MAX_RX_XFER);
192 SKB_ATUSB(skb) = atusb;
195 usb_fill_bulk_urb(urb, usb_dev, usb_rcvbulkpipe(usb_dev, 1),
196 skb->data, MAX_RX_XFER, atusb_in, skb);
197 usb_anchor_urb(urb, &atusb->rx_urbs);
199 ret = usb_submit_urb(urb, GFP_KERNEL);
201 usb_unanchor_urb(urb);
208 static void atusb_work_urbs(struct work_struct *work)
210 struct atusb *atusb =
211 container_of(to_delayed_work(work), struct atusb, work);
212 struct usb_device *usb_dev = atusb->usb_dev;
220 urb = usb_get_from_anchor(&atusb->idle_urbs);
223 ret = atusb_submit_rx_urb(atusb, urb);
226 usb_anchor_urb(urb, &atusb->idle_urbs);
227 dev_warn_ratelimited(&usb_dev->dev,
228 "atusb_in: can't allocate/submit URB (%d)\n", ret);
229 schedule_delayed_work(&atusb->work,
230 msecs_to_jiffies(ATUSB_ALLOC_DELAY_MS) + 1);
233 /* ----- Asynchronous USB -------------------------------------------------- */
235 static void atusb_tx_done(struct atusb *atusb, uint8_t seq)
237 struct usb_device *usb_dev = atusb->usb_dev;
238 uint8_t expect = atusb->tx_ack_seq;
240 dev_dbg(&usb_dev->dev, "atusb_tx_done (0x%02x/0x%02x)\n", seq, expect);
242 /* TODO check for ifs handling in firmware */
243 ieee802154_xmit_complete(atusb->hw, atusb->tx_skb, false);
245 /* TODO I experience this case when atusb has a tx complete
246 * irq before probing, we should fix the firmware it's an
247 * unlikely case now that seq == expect is then true, but can
248 * happen and fail with a tx_skb = NULL;
250 ieee802154_wake_queue(atusb->hw);
252 dev_kfree_skb_irq(atusb->tx_skb);
256 static void atusb_in_good(struct urb *urb)
258 struct usb_device *usb_dev = urb->dev;
259 struct sk_buff *skb = urb->context;
260 struct atusb *atusb = SKB_ATUSB(skb);
263 if (!urb->actual_length) {
264 dev_dbg(&usb_dev->dev, "atusb_in: zero-sized URB ?\n");
270 if (urb->actual_length == 1) {
271 atusb_tx_done(atusb, len);
275 if (len + 1 > urb->actual_length - 1) {
276 dev_dbg(&usb_dev->dev, "atusb_in: frame len %d+1 > URB %u-1\n",
277 len, urb->actual_length);
281 if (!ieee802154_is_valid_psdu_len(len)) {
282 dev_dbg(&usb_dev->dev, "atusb_in: frame corrupted\n");
286 lqi = skb->data[len + 1];
287 dev_dbg(&usb_dev->dev, "atusb_in: rx len %d lqi 0x%02x\n", len, lqi);
288 skb_pull(skb, 1); /* remove PHR */
289 skb_trim(skb, len); /* get payload only */
290 ieee802154_rx_irqsafe(atusb->hw, skb, lqi);
291 urb->context = NULL; /* skb is gone */
294 static void atusb_in(struct urb *urb)
296 struct usb_device *usb_dev = urb->dev;
297 struct sk_buff *skb = urb->context;
298 struct atusb *atusb = SKB_ATUSB(skb);
300 dev_dbg(&usb_dev->dev, "atusb_in: status %d len %d\n",
301 urb->status, urb->actual_length);
303 if (urb->status == -ENOENT) { /* being killed */
308 dev_dbg(&usb_dev->dev, "atusb_in: URB error %d\n", urb->status);
313 usb_anchor_urb(urb, &atusb->idle_urbs);
314 if (!atusb->shutdown)
315 schedule_delayed_work(&atusb->work, 0);
318 /* ----- URB allocation/deallocation --------------------------------------- */
320 static void atusb_free_urbs(struct atusb *atusb)
325 urb = usb_get_from_anchor(&atusb->idle_urbs);
329 kfree_skb(urb->context);
334 static int atusb_alloc_urbs(struct atusb *atusb, int n)
339 urb = usb_alloc_urb(0, GFP_KERNEL);
341 atusb_free_urbs(atusb);
344 usb_anchor_urb(urb, &atusb->idle_urbs);
351 /* ----- IEEE 802.15.4 interface operations -------------------------------- */
353 static void atusb_xmit_complete(struct urb *urb)
355 dev_dbg(&urb->dev->dev, "atusb_xmit urb completed");
358 static int atusb_xmit(struct ieee802154_hw *hw, struct sk_buff *skb)
360 struct atusb *atusb = hw->priv;
361 struct usb_device *usb_dev = atusb->usb_dev;
364 dev_dbg(&usb_dev->dev, "atusb_xmit (%d)\n", skb->len);
367 atusb->tx_dr.wIndex = cpu_to_le16(atusb->tx_ack_seq);
368 atusb->tx_dr.wLength = cpu_to_le16(skb->len);
370 usb_fill_control_urb(atusb->tx_urb, usb_dev,
371 usb_sndctrlpipe(usb_dev, 0),
372 (unsigned char *)&atusb->tx_dr, skb->data,
373 skb->len, atusb_xmit_complete, NULL);
374 ret = usb_submit_urb(atusb->tx_urb, GFP_ATOMIC);
375 dev_dbg(&usb_dev->dev, "atusb_xmit done (%d)\n", ret);
379 static int atusb_channel(struct ieee802154_hw *hw, u8 page, u8 channel)
381 struct atusb *atusb = hw->priv;
384 /* This implicitly sets the CCA (Clear Channel Assessment) mode to 0,
385 * "Mode 3a, Carrier sense OR energy above threshold".
386 * We should probably make this configurable. @@@
388 ret = atusb_write_reg(atusb, RG_PHY_CC_CCA, channel);
391 msleep(1); /* @@@ ugly synchronization */
395 static int atusb_ed(struct ieee802154_hw *hw, u8 *level)
402 static int atusb_set_hw_addr_filt(struct ieee802154_hw *hw,
403 struct ieee802154_hw_addr_filt *filt,
404 unsigned long changed)
406 struct atusb *atusb = hw->priv;
407 struct device *dev = &atusb->usb_dev->dev;
409 if (changed & IEEE802154_AFILT_SADDR_CHANGED) {
410 u16 addr = le16_to_cpu(filt->short_addr);
412 dev_vdbg(dev, "atusb_set_hw_addr_filt called for saddr\n");
413 atusb_write_reg(atusb, RG_SHORT_ADDR_0, addr);
414 atusb_write_reg(atusb, RG_SHORT_ADDR_1, addr >> 8);
417 if (changed & IEEE802154_AFILT_PANID_CHANGED) {
418 u16 pan = le16_to_cpu(filt->pan_id);
420 dev_vdbg(dev, "atusb_set_hw_addr_filt called for pan id\n");
421 atusb_write_reg(atusb, RG_PAN_ID_0, pan);
422 atusb_write_reg(atusb, RG_PAN_ID_1, pan >> 8);
425 if (changed & IEEE802154_AFILT_IEEEADDR_CHANGED) {
426 u8 i, addr[IEEE802154_EXTENDED_ADDR_LEN];
428 memcpy(addr, &filt->ieee_addr, IEEE802154_EXTENDED_ADDR_LEN);
429 dev_vdbg(dev, "atusb_set_hw_addr_filt called for IEEE addr\n");
430 for (i = 0; i < 8; i++)
431 atusb_write_reg(atusb, RG_IEEE_ADDR_0 + i, addr[i]);
434 if (changed & IEEE802154_AFILT_PANC_CHANGED) {
436 "atusb_set_hw_addr_filt called for panc change\n");
438 atusb_write_subreg(atusb, SR_AACK_I_AM_COORD, 1);
440 atusb_write_subreg(atusb, SR_AACK_I_AM_COORD, 0);
443 return atusb_get_and_clear_error(atusb);
446 static int atusb_start(struct ieee802154_hw *hw)
448 struct atusb *atusb = hw->priv;
449 struct usb_device *usb_dev = atusb->usb_dev;
452 dev_dbg(&usb_dev->dev, "atusb_start\n");
453 schedule_delayed_work(&atusb->work, 0);
454 atusb_command(atusb, ATUSB_RX_MODE, 1);
455 ret = atusb_get_and_clear_error(atusb);
457 usb_kill_anchored_urbs(&atusb->idle_urbs);
461 static void atusb_stop(struct ieee802154_hw *hw)
463 struct atusb *atusb = hw->priv;
464 struct usb_device *usb_dev = atusb->usb_dev;
466 dev_dbg(&usb_dev->dev, "atusb_stop\n");
467 usb_kill_anchored_urbs(&atusb->idle_urbs);
468 atusb_command(atusb, ATUSB_RX_MODE, 0);
469 atusb_get_and_clear_error(atusb);
472 #define ATUSB_MAX_TX_POWERS 0xF
473 static const s32 atusb_powers[ATUSB_MAX_TX_POWERS + 1] = {
474 300, 280, 230, 180, 130, 70, 0, -100, -200, -300, -400, -500, -700,
479 atusb_set_txpower(struct ieee802154_hw *hw, s32 mbm)
481 struct atusb *atusb = hw->priv;
484 for (i = 0; i < hw->phy->supported.tx_powers_size; i++) {
485 if (hw->phy->supported.tx_powers[i] == mbm)
486 return atusb_write_subreg(atusb, SR_TX_PWR_23X, i);
493 atusb_set_promiscuous_mode(struct ieee802154_hw *hw, const bool on)
495 struct atusb *atusb = hw->priv;
499 ret = atusb_write_subreg(atusb, SR_AACK_DIS_ACK, 1);
503 ret = atusb_write_subreg(atusb, SR_AACK_PROM_MODE, 1);
507 ret = atusb_write_subreg(atusb, SR_AACK_PROM_MODE, 0);
511 ret = atusb_write_subreg(atusb, SR_AACK_DIS_ACK, 0);
519 static struct ieee802154_ops atusb_ops = {
520 .owner = THIS_MODULE,
521 .xmit_async = atusb_xmit,
523 .set_channel = atusb_channel,
524 .start = atusb_start,
526 .set_hw_addr_filt = atusb_set_hw_addr_filt,
527 .set_txpower = atusb_set_txpower,
528 .set_promiscuous_mode = atusb_set_promiscuous_mode,
531 /* ----- Firmware and chip version information ----------------------------- */
533 static int atusb_get_and_show_revision(struct atusb *atusb)
535 struct usb_device *usb_dev = atusb->usb_dev;
536 unsigned char *buffer;
539 buffer = kmalloc(3, GFP_KERNEL);
543 /* Get a couple of the ATMega Firmware values */
544 ret = atusb_control_msg(atusb, usb_rcvctrlpipe(usb_dev, 0),
545 ATUSB_ID, ATUSB_REQ_FROM_DEV, 0, 0,
548 dev_info(&usb_dev->dev,
549 "Firmware: major: %u, minor: %u, hardware type: %u\n",
550 buffer[0], buffer[1], buffer[2]);
551 if (buffer[0] == 0 && buffer[1] < 2) {
552 dev_info(&usb_dev->dev,
553 "Firmware version (%u.%u) is predates our first public release.",
554 buffer[0], buffer[1]);
555 dev_info(&usb_dev->dev, "Please update to version 0.2 or newer");
562 static int atusb_get_and_show_build(struct atusb *atusb)
564 struct usb_device *usb_dev = atusb->usb_dev;
568 build = kmalloc(ATUSB_BUILD_SIZE + 1, GFP_KERNEL);
572 /* We cannot call atusb_control_msg() here, since this request may read various length data */
573 ret = usb_control_msg(atusb->usb_dev, usb_rcvctrlpipe(usb_dev, 0), ATUSB_BUILD,
574 ATUSB_REQ_FROM_DEV, 0, 0, build, ATUSB_BUILD_SIZE, 1000);
577 dev_info(&usb_dev->dev, "Firmware: build %s\n", build);
584 static int atusb_get_and_show_chip(struct atusb *atusb)
586 struct usb_device *usb_dev = atusb->usb_dev;
587 uint8_t man_id_0, man_id_1, part_num, version_num;
590 man_id_0 = atusb_read_reg(atusb, RG_MAN_ID_0);
591 man_id_1 = atusb_read_reg(atusb, RG_MAN_ID_1);
592 part_num = atusb_read_reg(atusb, RG_PART_NUM);
593 version_num = atusb_read_reg(atusb, RG_VERSION_NUM);
598 if ((man_id_1 << 8 | man_id_0) != ATUSB_JEDEC_ATMEL) {
599 dev_err(&usb_dev->dev,
600 "non-Atmel transceiver xxxx%02x%02x\n",
613 dev_err(&usb_dev->dev,
614 "unexpected transceiver, part 0x%02x version 0x%02x\n",
615 part_num, version_num);
619 dev_info(&usb_dev->dev, "ATUSB: %s version %d\n", chip, version_num);
624 atusb->err = -ENODEV;
628 /* ----- Setup ------------------------------------------------------------- */
630 static int atusb_probe(struct usb_interface *interface,
631 const struct usb_device_id *id)
633 struct usb_device *usb_dev = interface_to_usbdev(interface);
634 struct ieee802154_hw *hw;
635 struct atusb *atusb = NULL;
638 hw = ieee802154_alloc_hw(sizeof(struct atusb), &atusb_ops);
644 atusb->usb_dev = usb_get_dev(usb_dev);
645 usb_set_intfdata(interface, atusb);
649 INIT_DELAYED_WORK(&atusb->work, atusb_work_urbs);
650 init_usb_anchor(&atusb->idle_urbs);
651 init_usb_anchor(&atusb->rx_urbs);
653 if (atusb_alloc_urbs(atusb, ATUSB_NUM_RX_URBS))
656 atusb->tx_dr.bRequestType = ATUSB_REQ_TO_DEV;
657 atusb->tx_dr.bRequest = ATUSB_TX;
658 atusb->tx_dr.wValue = cpu_to_le16(0);
660 atusb->tx_urb = usb_alloc_urb(0, GFP_ATOMIC);
664 hw->parent = &usb_dev->dev;
665 hw->flags = IEEE802154_HW_TX_OMIT_CKSUM | IEEE802154_HW_AFILT |
666 IEEE802154_HW_PROMISCUOUS;
668 hw->phy->flags = WPAN_PHY_FLAG_TXPOWER;
670 hw->phy->current_page = 0;
671 hw->phy->current_channel = 11; /* reset default */
672 hw->phy->supported.channels[0] = 0x7FFF800;
673 hw->phy->supported.tx_powers = atusb_powers;
674 hw->phy->supported.tx_powers_size = ARRAY_SIZE(atusb_powers);
675 hw->phy->transmit_power = hw->phy->supported.tx_powers[0];
676 ieee802154_random_extended_addr(&hw->phy->perm_extended_addr);
678 atusb_command(atusb, ATUSB_RF_RESET, 0);
679 atusb_get_and_show_chip(atusb);
680 atusb_get_and_show_revision(atusb);
681 atusb_get_and_show_build(atusb);
682 ret = atusb_get_and_clear_error(atusb);
684 dev_err(&atusb->usb_dev->dev,
685 "%s: initialization failed, error = %d\n",
690 ret = ieee802154_register_hw(hw);
694 /* If we just powered on, we're now in P_ON and need to enter TRX_OFF
695 * explicitly. Any resets after that will send us straight to TRX_OFF,
696 * making the command below redundant.
698 atusb_write_reg(atusb, RG_TRX_STATE, STATE_FORCE_TRX_OFF);
699 msleep(1); /* reset => TRX_OFF, tTR13 = 37 us */
702 /* Calculating the maximum time available to empty the frame buffer
705 * According to [1], the inter-frame gap is
706 * R * 20 * 16 us + 128 us
707 * where R is a random number from 0 to 7. Furthermore, we have 20 bit
708 * times (80 us at 250 kbps) of SHR of the next frame before the
709 * transceiver begins storing data in the frame buffer.
711 * This yields a minimum time of 208 us between the last data of a
712 * frame and the first data of the next frame. This time is further
713 * reduced by interrupt latency in the atusb firmware.
715 * atusb currently needs about 500 us to retrieve a maximum-sized
716 * frame. We therefore have to allow reception of a new frame to begin
717 * while we retrieve the previous frame.
719 * [1] "JN-AN-1035 Calculating data rates in an IEEE 802.15.4-based
720 * network", Jennic 2006.
721 * http://www.jennic.com/download_file.php?supportFile=JN-AN-1035%20Calculating%20802-15-4%20Data%20Rates-1v0.pdf
724 atusb_write_subreg(atusb, SR_RX_SAFE_MODE, 1);
726 atusb_write_reg(atusb, RG_IRQ_MASK, 0xff);
728 ret = atusb_get_and_clear_error(atusb);
732 dev_err(&atusb->usb_dev->dev,
733 "%s: setup failed, error = %d\n",
736 ieee802154_unregister_hw(hw);
738 atusb_free_urbs(atusb);
739 usb_kill_urb(atusb->tx_urb);
740 usb_free_urb(atusb->tx_urb);
741 usb_put_dev(usb_dev);
742 ieee802154_free_hw(hw);
746 static void atusb_disconnect(struct usb_interface *interface)
748 struct atusb *atusb = usb_get_intfdata(interface);
750 dev_dbg(&atusb->usb_dev->dev, "atusb_disconnect\n");
753 cancel_delayed_work_sync(&atusb->work);
755 usb_kill_anchored_urbs(&atusb->rx_urbs);
756 atusb_free_urbs(atusb);
757 usb_kill_urb(atusb->tx_urb);
758 usb_free_urb(atusb->tx_urb);
760 ieee802154_unregister_hw(atusb->hw);
762 usb_put_dev(atusb->usb_dev);
764 ieee802154_free_hw(atusb->hw);
766 usb_set_intfdata(interface, NULL);
768 pr_debug("atusb_disconnect done\n");
771 /* The devices we work with */
772 static const struct usb_device_id atusb_device_table[] = {
774 .match_flags = USB_DEVICE_ID_MATCH_DEVICE |
775 USB_DEVICE_ID_MATCH_INT_INFO,
776 .idVendor = ATUSB_VENDOR_ID,
777 .idProduct = ATUSB_PRODUCT_ID,
778 .bInterfaceClass = USB_CLASS_VENDOR_SPEC
780 /* end with null element */
783 MODULE_DEVICE_TABLE(usb, atusb_device_table);
785 static struct usb_driver atusb_driver = {
787 .probe = atusb_probe,
788 .disconnect = atusb_disconnect,
789 .id_table = atusb_device_table,
791 module_usb_driver(atusb_driver);
793 MODULE_AUTHOR("Alexander Aring <alex.aring@gmail.com>");
794 MODULE_AUTHOR("Richard Sharpe <realrichardsharpe@gmail.com>");
795 MODULE_AUTHOR("Stefan Schmidt <stefan@datenfreihafen.org>");
796 MODULE_AUTHOR("Werner Almesberger <werner@almesberger.net>");
797 MODULE_DESCRIPTION("ATUSB IEEE 802.15.4 Driver");
798 MODULE_LICENSE("GPL");