2 * AT86RF230/RF231 driver
4 * Copyright (C) 2009-2012 Siemens AG
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
16 * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
17 * Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
18 * Alexander Aring <aar@pengutronix.de>
20 #include <linux/kernel.h>
21 #include <linux/module.h>
22 #include <linux/hrtimer.h>
23 #include <linux/jiffies.h>
24 #include <linux/interrupt.h>
25 #include <linux/irq.h>
26 #include <linux/gpio.h>
27 #include <linux/delay.h>
28 #include <linux/spi/spi.h>
29 #include <linux/spi/at86rf230.h>
30 #include <linux/regmap.h>
31 #include <linux/skbuff.h>
32 #include <linux/of_gpio.h>
33 #include <linux/ieee802154.h>
35 #include <net/mac802154.h>
36 #include <net/cfg802154.h>
38 #include "at86rf230.h"
40 struct at86rf230_local;
41 /* at86rf2xx chip depend data.
42 * All timings are in us.
44 struct at86rf2xx_chip_data {
56 int (*set_channel)(struct at86rf230_local *, u8, u8);
57 int (*set_txpower)(struct at86rf230_local *, s32);
60 #define AT86RF2XX_MAX_BUF (127 + 3)
61 /* tx retries to access the TX_ON state
62 * if it's above then force change will be started.
64 * We assume the max_frame_retries (7) value of 802.15.4 here.
66 #define AT86RF2XX_MAX_TX_RETRIES 7
67 /* We use the recommended 5 minutes timeout to recalibrate */
68 #define AT86RF2XX_CAL_LOOP_TIMEOUT (5 * 60 * HZ)
70 struct at86rf230_state_change {
71 struct at86rf230_local *lp;
75 struct spi_message msg;
76 struct spi_transfer trx;
77 u8 buf[AT86RF2XX_MAX_BUF];
79 void (*complete)(void *context);
86 struct at86rf230_local {
87 struct spi_device *spi;
89 struct ieee802154_hw *hw;
90 struct at86rf2xx_chip_data *data;
91 struct regmap *regmap;
95 struct completion state_complete;
96 struct at86rf230_state_change state;
98 struct at86rf230_state_change irq;
100 unsigned long cal_timeout;
104 struct sk_buff *tx_skb;
105 struct at86rf230_state_change tx;
108 #define AT86RF2XX_NUMREGS 0x3F
111 at86rf230_async_state_change(struct at86rf230_local *lp,
112 struct at86rf230_state_change *ctx,
113 const u8 state, void (*complete)(void *context),
114 const bool irq_enable);
117 at86rf230_sleep(struct at86rf230_local *lp)
119 if (gpio_is_valid(lp->slp_tr)) {
120 gpio_set_value(lp->slp_tr, 1);
121 usleep_range(lp->data->t_off_to_sleep,
122 lp->data->t_off_to_sleep + 10);
128 at86rf230_awake(struct at86rf230_local *lp)
130 if (gpio_is_valid(lp->slp_tr)) {
131 gpio_set_value(lp->slp_tr, 0);
132 usleep_range(lp->data->t_sleep_to_off,
133 lp->data->t_sleep_to_off + 100);
139 __at86rf230_write(struct at86rf230_local *lp,
140 unsigned int addr, unsigned int data)
142 bool sleep = lp->sleep;
145 /* awake for register setting if sleep */
149 ret = regmap_write(lp->regmap, addr, data);
151 /* sleep again if was sleeping */
159 __at86rf230_read(struct at86rf230_local *lp,
160 unsigned int addr, unsigned int *data)
162 bool sleep = lp->sleep;
165 /* awake for register setting if sleep */
169 ret = regmap_read(lp->regmap, addr, data);
171 /* sleep again if was sleeping */
179 at86rf230_read_subreg(struct at86rf230_local *lp,
180 unsigned int addr, unsigned int mask,
181 unsigned int shift, unsigned int *data)
185 rc = __at86rf230_read(lp, addr, data);
187 *data = (*data & mask) >> shift;
193 at86rf230_write_subreg(struct at86rf230_local *lp,
194 unsigned int addr, unsigned int mask,
195 unsigned int shift, unsigned int data)
197 bool sleep = lp->sleep;
200 /* awake for register setting if sleep */
204 ret = regmap_update_bits(lp->regmap, addr, mask, data << shift);
206 /* sleep again if was sleeping */
214 at86rf230_slp_tr_rising_edge(struct at86rf230_local *lp)
216 gpio_set_value(lp->slp_tr, 1);
218 gpio_set_value(lp->slp_tr, 0);
222 at86rf230_reg_writeable(struct device *dev, unsigned int reg)
229 case RG_PHY_ED_LEVEL:
245 case RG_SHORT_ADDR_0:
246 case RG_SHORT_ADDR_1:
268 at86rf230_reg_readable(struct device *dev, unsigned int reg)
272 /* all writeable are also readable */
273 rc = at86rf230_reg_writeable(dev, reg);
293 at86rf230_reg_volatile(struct device *dev, unsigned int reg)
295 /* can be changed during runtime */
300 case RG_PHY_ED_LEVEL:
312 at86rf230_reg_precious(struct device *dev, unsigned int reg)
314 /* don't clear irq line on read */
323 static const struct regmap_config at86rf230_regmap_spi_config = {
326 .write_flag_mask = CMD_REG | CMD_WRITE,
327 .read_flag_mask = CMD_REG,
328 .cache_type = REGCACHE_RBTREE,
329 .max_register = AT86RF2XX_NUMREGS,
330 .writeable_reg = at86rf230_reg_writeable,
331 .readable_reg = at86rf230_reg_readable,
332 .volatile_reg = at86rf230_reg_volatile,
333 .precious_reg = at86rf230_reg_precious,
337 at86rf230_async_error_recover(void *context)
339 struct at86rf230_state_change *ctx = context;
340 struct at86rf230_local *lp = ctx->lp;
343 at86rf230_async_state_change(lp, ctx, STATE_RX_AACK_ON, NULL, false);
344 ieee802154_wake_queue(lp->hw);
348 at86rf230_async_error(struct at86rf230_local *lp,
349 struct at86rf230_state_change *ctx, int rc)
351 dev_err(&lp->spi->dev, "spi_async error %d\n", rc);
353 at86rf230_async_state_change(lp, ctx, STATE_FORCE_TRX_OFF,
354 at86rf230_async_error_recover, false);
357 /* Generic function to get some register value in async mode */
359 at86rf230_async_read_reg(struct at86rf230_local *lp, const u8 reg,
360 struct at86rf230_state_change *ctx,
361 void (*complete)(void *context),
362 const bool irq_enable)
366 u8 *tx_buf = ctx->buf;
368 tx_buf[0] = (reg & CMD_REG_MASK) | CMD_REG;
369 ctx->msg.complete = complete;
370 ctx->irq_enable = irq_enable;
371 rc = spi_async(lp->spi, &ctx->msg);
374 enable_irq(ctx->irq);
376 at86rf230_async_error(lp, ctx, rc);
380 static inline u8 at86rf230_state_to_force(u8 state)
382 if (state == STATE_TX_ON)
383 return STATE_FORCE_TX_ON;
385 return STATE_FORCE_TRX_OFF;
389 at86rf230_async_state_assert(void *context)
391 struct at86rf230_state_change *ctx = context;
392 struct at86rf230_local *lp = ctx->lp;
393 const u8 *buf = ctx->buf;
394 const u8 trx_state = buf[1] & TRX_STATE_MASK;
396 /* Assert state change */
397 if (trx_state != ctx->to_state) {
398 /* Special handling if transceiver state is in
399 * STATE_BUSY_RX_AACK and a SHR was detected.
401 if (trx_state == STATE_BUSY_RX_AACK) {
402 /* Undocumented race condition. If we send a state
403 * change to STATE_RX_AACK_ON the transceiver could
404 * change his state automatically to STATE_BUSY_RX_AACK
405 * if a SHR was detected. This is not an error, but we
408 if (ctx->to_state == STATE_RX_AACK_ON)
411 /* If we change to STATE_TX_ON without forcing and
412 * transceiver state is STATE_BUSY_RX_AACK, we wait
413 * 'tFrame + tPAck' receiving time. In this time the
414 * PDU should be received. If the transceiver is still
415 * in STATE_BUSY_RX_AACK, we run a force state change
416 * to STATE_TX_ON. This is a timeout handling, if the
417 * transceiver stucks in STATE_BUSY_RX_AACK.
419 * Additional we do several retries to try to get into
420 * TX_ON state without forcing. If the retries are
421 * higher or equal than AT86RF2XX_MAX_TX_RETRIES we
422 * will do a force change.
424 if (ctx->to_state == STATE_TX_ON ||
425 ctx->to_state == STATE_TRX_OFF) {
426 u8 state = ctx->to_state;
428 if (lp->tx_retry >= AT86RF2XX_MAX_TX_RETRIES)
429 state = at86rf230_state_to_force(state);
432 at86rf230_async_state_change(lp, ctx, state,
439 dev_warn(&lp->spi->dev, "unexcept state change from 0x%02x to 0x%02x. Actual state: 0x%02x\n",
440 ctx->from_state, ctx->to_state, trx_state);
445 ctx->complete(context);
448 static enum hrtimer_restart at86rf230_async_state_timer(struct hrtimer *timer)
450 struct at86rf230_state_change *ctx =
451 container_of(timer, struct at86rf230_state_change, timer);
452 struct at86rf230_local *lp = ctx->lp;
454 at86rf230_async_read_reg(lp, RG_TRX_STATUS, ctx,
455 at86rf230_async_state_assert,
458 return HRTIMER_NORESTART;
461 /* Do state change timing delay. */
463 at86rf230_async_state_delay(void *context)
465 struct at86rf230_state_change *ctx = context;
466 struct at86rf230_local *lp = ctx->lp;
467 struct at86rf2xx_chip_data *c = lp->data;
471 /* The force state changes are will show as normal states in the
472 * state status subregister. We change the to_state to the
473 * corresponding one and remember if it was a force change, this
474 * differs if we do a state change from STATE_BUSY_RX_AACK.
476 switch (ctx->to_state) {
477 case STATE_FORCE_TX_ON:
478 ctx->to_state = STATE_TX_ON;
481 case STATE_FORCE_TRX_OFF:
482 ctx->to_state = STATE_TRX_OFF;
489 switch (ctx->from_state) {
491 switch (ctx->to_state) {
492 case STATE_RX_AACK_ON:
493 tim = ktime_set(0, c->t_off_to_aack * NSEC_PER_USEC);
494 /* state change from TRX_OFF to RX_AACK_ON to do a
495 * calibration, we need to reset the timeout for the
498 lp->cal_timeout = jiffies + AT86RF2XX_CAL_LOOP_TIMEOUT;
500 case STATE_TX_ARET_ON:
502 tim = ktime_set(0, c->t_off_to_tx_on * NSEC_PER_USEC);
503 /* state change from TRX_OFF to TX_ON or ARET_ON to do
504 * a calibration, we need to reset the timeout for the
507 lp->cal_timeout = jiffies + AT86RF2XX_CAL_LOOP_TIMEOUT;
513 case STATE_BUSY_RX_AACK:
514 switch (ctx->to_state) {
517 /* Wait for worst case receiving time if we
518 * didn't make a force change from BUSY_RX_AACK
519 * to TX_ON or TRX_OFF.
522 tim = ktime_set(0, (c->t_frame + c->t_p_ack) *
531 /* Default value, means RESET state */
533 switch (ctx->to_state) {
535 tim = ktime_set(0, c->t_reset_to_off * NSEC_PER_USEC);
545 /* Default delay is 1us in the most cases */
547 at86rf230_async_state_timer(&ctx->timer);
551 hrtimer_start(&ctx->timer, tim, HRTIMER_MODE_REL);
555 at86rf230_async_state_change_start(void *context)
557 struct at86rf230_state_change *ctx = context;
558 struct at86rf230_local *lp = ctx->lp;
560 const u8 trx_state = buf[1] & TRX_STATE_MASK;
563 /* Check for "possible" STATE_TRANSITION_IN_PROGRESS */
564 if (trx_state == STATE_TRANSITION_IN_PROGRESS) {
566 at86rf230_async_read_reg(lp, RG_TRX_STATUS, ctx,
567 at86rf230_async_state_change_start,
572 /* Check if we already are in the state which we change in */
573 if (trx_state == ctx->to_state) {
575 ctx->complete(context);
579 /* Set current state to the context of state change */
580 ctx->from_state = trx_state;
582 /* Going into the next step for a state change which do a timing
585 buf[0] = (RG_TRX_STATE & CMD_REG_MASK) | CMD_REG | CMD_WRITE;
586 buf[1] = ctx->to_state;
587 ctx->msg.complete = at86rf230_async_state_delay;
588 rc = spi_async(lp->spi, &ctx->msg);
591 enable_irq(ctx->irq);
593 at86rf230_async_error(lp, ctx, rc);
598 at86rf230_async_state_change(struct at86rf230_local *lp,
599 struct at86rf230_state_change *ctx,
600 const u8 state, void (*complete)(void *context),
601 const bool irq_enable)
603 /* Initialization for the state change context */
604 ctx->to_state = state;
605 ctx->complete = complete;
606 ctx->irq_enable = irq_enable;
607 at86rf230_async_read_reg(lp, RG_TRX_STATUS, ctx,
608 at86rf230_async_state_change_start,
613 at86rf230_sync_state_change_complete(void *context)
615 struct at86rf230_state_change *ctx = context;
616 struct at86rf230_local *lp = ctx->lp;
618 complete(&lp->state_complete);
621 /* This function do a sync framework above the async state change.
622 * Some callbacks of the IEEE 802.15.4 driver interface need to be
623 * handled synchronously.
626 at86rf230_sync_state_change(struct at86rf230_local *lp, unsigned int state)
630 at86rf230_async_state_change(lp, &lp->state, state,
631 at86rf230_sync_state_change_complete,
634 rc = wait_for_completion_timeout(&lp->state_complete,
635 msecs_to_jiffies(100));
637 at86rf230_async_error(lp, &lp->state, -ETIMEDOUT);
645 at86rf230_tx_complete(void *context)
647 struct at86rf230_state_change *ctx = context;
648 struct at86rf230_local *lp = ctx->lp;
650 enable_irq(ctx->irq);
652 ieee802154_xmit_complete(lp->hw, lp->tx_skb, false);
656 at86rf230_tx_on(void *context)
658 struct at86rf230_state_change *ctx = context;
659 struct at86rf230_local *lp = ctx->lp;
661 at86rf230_async_state_change(lp, ctx, STATE_RX_AACK_ON,
662 at86rf230_tx_complete, true);
666 at86rf230_tx_trac_check(void *context)
668 struct at86rf230_state_change *ctx = context;
669 struct at86rf230_local *lp = ctx->lp;
670 const u8 *buf = ctx->buf;
671 const u8 trac = (buf[1] & 0xe0) >> 5;
673 /* If trac status is different than zero we need to do a state change
674 * to STATE_FORCE_TRX_OFF then STATE_RX_AACK_ON to recover the
678 at86rf230_async_state_change(lp, ctx, STATE_FORCE_TRX_OFF,
679 at86rf230_tx_on, true);
681 at86rf230_tx_on(context);
685 at86rf230_tx_trac_status(void *context)
687 struct at86rf230_state_change *ctx = context;
688 struct at86rf230_local *lp = ctx->lp;
690 at86rf230_async_read_reg(lp, RG_TRX_STATE, ctx,
691 at86rf230_tx_trac_check, true);
695 at86rf230_rx_read_frame_complete(void *context)
697 struct at86rf230_state_change *ctx = context;
698 struct at86rf230_local *lp = ctx->lp;
699 u8 rx_local_buf[AT86RF2XX_MAX_BUF];
700 const u8 *buf = ctx->buf;
705 if (!ieee802154_is_valid_psdu_len(len)) {
706 dev_vdbg(&lp->spi->dev, "corrupted frame received\n");
707 len = IEEE802154_MTU;
711 memcpy(rx_local_buf, buf + 2, len);
713 enable_irq(ctx->irq);
715 skb = dev_alloc_skb(IEEE802154_MTU);
717 dev_vdbg(&lp->spi->dev, "failed to allocate sk_buff\n");
721 memcpy(skb_put(skb, len), rx_local_buf, len);
722 ieee802154_rx_irqsafe(lp->hw, skb, lqi);
726 at86rf230_rx_read_frame(void *context)
728 struct at86rf230_state_change *ctx = context;
729 struct at86rf230_local *lp = ctx->lp;
734 ctx->trx.len = AT86RF2XX_MAX_BUF;
735 ctx->msg.complete = at86rf230_rx_read_frame_complete;
736 rc = spi_async(lp->spi, &ctx->msg);
739 enable_irq(ctx->irq);
740 at86rf230_async_error(lp, ctx, rc);
745 at86rf230_rx_trac_check(void *context)
747 /* Possible check on trac status here. This could be useful to make
748 * some stats why receive is failed. Not used at the moment, but it's
749 * maybe timing relevant. Datasheet doesn't say anything about this.
750 * The programming guide say do it so.
753 at86rf230_rx_read_frame(context);
757 at86rf230_irq_trx_end(struct at86rf230_local *lp)
761 at86rf230_async_state_change(lp, &lp->irq,
763 at86rf230_tx_trac_status,
766 at86rf230_async_read_reg(lp, RG_TRX_STATE, &lp->irq,
767 at86rf230_rx_trac_check, true);
772 at86rf230_irq_status(void *context)
774 struct at86rf230_state_change *ctx = context;
775 struct at86rf230_local *lp = ctx->lp;
776 const u8 *buf = ctx->buf;
777 const u8 irq = buf[1];
779 if (irq & IRQ_TRX_END) {
780 at86rf230_irq_trx_end(lp);
782 enable_irq(ctx->irq);
783 dev_err(&lp->spi->dev, "not supported irq %02x received\n",
788 static irqreturn_t at86rf230_isr(int irq, void *data)
790 struct at86rf230_local *lp = data;
791 struct at86rf230_state_change *ctx = &lp->irq;
795 disable_irq_nosync(irq);
797 buf[0] = (RG_IRQ_STATUS & CMD_REG_MASK) | CMD_REG;
798 ctx->msg.complete = at86rf230_irq_status;
799 rc = spi_async(lp->spi, &ctx->msg);
802 at86rf230_async_error(lp, ctx, rc);
810 at86rf230_write_frame_complete(void *context)
812 struct at86rf230_state_change *ctx = context;
813 struct at86rf230_local *lp = ctx->lp;
819 if (gpio_is_valid(lp->slp_tr)) {
820 at86rf230_slp_tr_rising_edge(lp);
822 buf[0] = (RG_TRX_STATE & CMD_REG_MASK) | CMD_REG | CMD_WRITE;
823 buf[1] = STATE_BUSY_TX;
824 ctx->msg.complete = NULL;
825 rc = spi_async(lp->spi, &ctx->msg);
827 at86rf230_async_error(lp, ctx, rc);
832 at86rf230_write_frame(void *context)
834 struct at86rf230_state_change *ctx = context;
835 struct at86rf230_local *lp = ctx->lp;
836 struct sk_buff *skb = lp->tx_skb;
842 buf[0] = CMD_FB | CMD_WRITE;
843 buf[1] = skb->len + 2;
844 memcpy(buf + 2, skb->data, skb->len);
845 ctx->trx.len = skb->len + 2;
846 ctx->msg.complete = at86rf230_write_frame_complete;
847 rc = spi_async(lp->spi, &ctx->msg);
850 at86rf230_async_error(lp, ctx, rc);
855 at86rf230_xmit_tx_on(void *context)
857 struct at86rf230_state_change *ctx = context;
858 struct at86rf230_local *lp = ctx->lp;
860 at86rf230_async_state_change(lp, ctx, STATE_TX_ARET_ON,
861 at86rf230_write_frame, false);
865 at86rf230_xmit_start(void *context)
867 struct at86rf230_state_change *ctx = context;
868 struct at86rf230_local *lp = ctx->lp;
870 /* check if we change from off state */
871 if (lp->is_tx_from_off) {
872 lp->is_tx_from_off = false;
873 at86rf230_async_state_change(lp, ctx, STATE_TX_ARET_ON,
874 at86rf230_write_frame,
877 at86rf230_async_state_change(lp, ctx, STATE_TX_ON,
878 at86rf230_xmit_tx_on,
884 at86rf230_xmit(struct ieee802154_hw *hw, struct sk_buff *skb)
886 struct at86rf230_local *lp = hw->priv;
887 struct at86rf230_state_change *ctx = &lp->tx;
892 /* After 5 minutes in PLL and the same frequency we run again the
893 * calibration loops which is recommended by at86rf2xx datasheets.
895 * The calibration is initiate by a state change from TRX_OFF
896 * to TX_ON, the lp->cal_timeout should be reinit by state_delay
897 * function then to start in the next 5 minutes.
899 if (time_is_before_jiffies(lp->cal_timeout)) {
900 lp->is_tx_from_off = true;
901 at86rf230_async_state_change(lp, ctx, STATE_TRX_OFF,
902 at86rf230_xmit_start, false);
904 at86rf230_xmit_start(ctx);
911 at86rf230_ed(struct ieee802154_hw *hw, u8 *level)
919 at86rf230_start(struct ieee802154_hw *hw)
921 struct at86rf230_local *lp = hw->priv;
924 enable_irq(lp->spi->irq);
926 return at86rf230_sync_state_change(lp, STATE_RX_AACK_ON);
930 at86rf230_stop(struct ieee802154_hw *hw)
932 struct at86rf230_local *lp = hw->priv;
935 at86rf230_sync_state_change(lp, STATE_FORCE_TRX_OFF);
937 disable_irq(lp->spi->irq);
939 /* It's recommended to set random new csma_seeds before sleep state.
940 * Makes only sense in the stop callback, not doing this inside of
941 * at86rf230_sleep, this is also used when we don't transmit afterwards
942 * when calling start callback again.
944 get_random_bytes(csma_seed, ARRAY_SIZE(csma_seed));
945 at86rf230_write_subreg(lp, SR_CSMA_SEED_0, csma_seed[0]);
946 at86rf230_write_subreg(lp, SR_CSMA_SEED_1, csma_seed[1]);
952 at86rf23x_set_channel(struct at86rf230_local *lp, u8 page, u8 channel)
954 return at86rf230_write_subreg(lp, SR_CHANNEL, channel);
957 #define AT86RF2XX_MAX_ED_LEVELS 0xF
958 static const s32 at86rf23x_ed_levels[AT86RF2XX_MAX_ED_LEVELS + 1] = {
959 -9100, -8900, -8700, -8500, -8300, -8100, -7900, -7700, -7500, -7300,
960 -7100, -6900, -6700, -6500, -6300, -6100,
963 static const s32 at86rf212_ed_levels_100[AT86RF2XX_MAX_ED_LEVELS + 1] = {
964 -10000, -9800, -9600, -9400, -9200, -9000, -8800, -8600, -8400, -8200,
965 -8000, -7800, -7600, -7400, -7200, -7000,
968 static const s32 at86rf212_ed_levels_98[AT86RF2XX_MAX_ED_LEVELS + 1] = {
969 -9800, -9600, -9400, -9200, -9000, -8800, -8600, -8400, -8200, -8000,
970 -7800, -7600, -7400, -7200, -7000, -6800,
974 at86rf212_update_cca_ed_level(struct at86rf230_local *lp, int rssi_base_val)
976 unsigned int cca_ed_thres;
979 rc = at86rf230_read_subreg(lp, SR_CCA_ED_THRES, &cca_ed_thres);
983 switch (rssi_base_val) {
985 lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_98;
986 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_98);
987 lp->hw->phy->cca_ed_level = at86rf212_ed_levels_98[cca_ed_thres];
990 lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_100;
991 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_100);
992 lp->hw->phy->cca_ed_level = at86rf212_ed_levels_100[cca_ed_thres];
1002 at86rf212_set_channel(struct at86rf230_local *lp, u8 page, u8 channel)
1007 rc = at86rf230_write_subreg(lp, SR_SUB_MODE, 0);
1009 rc = at86rf230_write_subreg(lp, SR_SUB_MODE, 1);
1014 rc = at86rf230_write_subreg(lp, SR_BPSK_QPSK, 0);
1015 lp->data->rssi_base_val = -100;
1017 rc = at86rf230_write_subreg(lp, SR_BPSK_QPSK, 1);
1018 lp->data->rssi_base_val = -98;
1023 rc = at86rf212_update_cca_ed_level(lp, lp->data->rssi_base_val);
1027 /* This sets the symbol_duration according frequency on the 212.
1028 * TODO move this handling while set channel and page in cfg802154.
1029 * We can do that, this timings are according 802.15.4 standard.
1030 * If we do that in cfg802154, this is a more generic calculation.
1032 * This should also protected from ifs_timer. Means cancel timer and
1033 * init with a new value. For now, this is okay.
1037 /* SUB:0 and BPSK:0 -> BPSK-20 */
1038 lp->hw->phy->symbol_duration = 50;
1040 /* SUB:1 and BPSK:0 -> BPSK-40 */
1041 lp->hw->phy->symbol_duration = 25;
1045 /* SUB:0 and BPSK:1 -> OQPSK-100/200/400 */
1046 lp->hw->phy->symbol_duration = 40;
1048 /* SUB:1 and BPSK:1 -> OQPSK-250/500/1000 */
1049 lp->hw->phy->symbol_duration = 16;
1052 lp->hw->phy->lifs_period = IEEE802154_LIFS_PERIOD *
1053 lp->hw->phy->symbol_duration;
1054 lp->hw->phy->sifs_period = IEEE802154_SIFS_PERIOD *
1055 lp->hw->phy->symbol_duration;
1057 return at86rf230_write_subreg(lp, SR_CHANNEL, channel);
1061 at86rf230_channel(struct ieee802154_hw *hw, u8 page, u8 channel)
1063 struct at86rf230_local *lp = hw->priv;
1066 rc = lp->data->set_channel(lp, page, channel);
1068 usleep_range(lp->data->t_channel_switch,
1069 lp->data->t_channel_switch + 10);
1071 lp->cal_timeout = jiffies + AT86RF2XX_CAL_LOOP_TIMEOUT;
1076 at86rf230_set_hw_addr_filt(struct ieee802154_hw *hw,
1077 struct ieee802154_hw_addr_filt *filt,
1078 unsigned long changed)
1080 struct at86rf230_local *lp = hw->priv;
1082 if (changed & IEEE802154_AFILT_SADDR_CHANGED) {
1083 u16 addr = le16_to_cpu(filt->short_addr);
1085 dev_vdbg(&lp->spi->dev,
1086 "at86rf230_set_hw_addr_filt called for saddr\n");
1087 __at86rf230_write(lp, RG_SHORT_ADDR_0, addr);
1088 __at86rf230_write(lp, RG_SHORT_ADDR_1, addr >> 8);
1091 if (changed & IEEE802154_AFILT_PANID_CHANGED) {
1092 u16 pan = le16_to_cpu(filt->pan_id);
1094 dev_vdbg(&lp->spi->dev,
1095 "at86rf230_set_hw_addr_filt called for pan id\n");
1096 __at86rf230_write(lp, RG_PAN_ID_0, pan);
1097 __at86rf230_write(lp, RG_PAN_ID_1, pan >> 8);
1100 if (changed & IEEE802154_AFILT_IEEEADDR_CHANGED) {
1103 memcpy(addr, &filt->ieee_addr, 8);
1104 dev_vdbg(&lp->spi->dev,
1105 "at86rf230_set_hw_addr_filt called for IEEE addr\n");
1106 for (i = 0; i < 8; i++)
1107 __at86rf230_write(lp, RG_IEEE_ADDR_0 + i, addr[i]);
1110 if (changed & IEEE802154_AFILT_PANC_CHANGED) {
1111 dev_vdbg(&lp->spi->dev,
1112 "at86rf230_set_hw_addr_filt called for panc change\n");
1113 if (filt->pan_coord)
1114 at86rf230_write_subreg(lp, SR_AACK_I_AM_COORD, 1);
1116 at86rf230_write_subreg(lp, SR_AACK_I_AM_COORD, 0);
1122 #define AT86RF23X_MAX_TX_POWERS 0xF
1123 static const s32 at86rf233_powers[AT86RF23X_MAX_TX_POWERS + 1] = {
1124 400, 370, 340, 300, 250, 200, 100, 0, -100, -200, -300, -400, -600,
1128 static const s32 at86rf231_powers[AT86RF23X_MAX_TX_POWERS + 1] = {
1129 300, 280, 230, 180, 130, 70, 0, -100, -200, -300, -400, -500, -700,
1133 #define AT86RF212_MAX_TX_POWERS 0x1F
1134 static const s32 at86rf212_powers[AT86RF212_MAX_TX_POWERS + 1] = {
1135 500, 400, 300, 200, 100, 0, -100, -200, -300, -400, -500, -600, -700,
1136 -800, -900, -1000, -1100, -1200, -1300, -1400, -1500, -1600, -1700,
1137 -1800, -1900, -2000, -2100, -2200, -2300, -2400, -2500, -2600,
1141 at86rf23x_set_txpower(struct at86rf230_local *lp, s32 mbm)
1145 for (i = 0; i < lp->hw->phy->supported.tx_powers_size; i++) {
1146 if (lp->hw->phy->supported.tx_powers[i] == mbm)
1147 return at86rf230_write_subreg(lp, SR_TX_PWR_23X, i);
1154 at86rf212_set_txpower(struct at86rf230_local *lp, s32 mbm)
1158 for (i = 0; i < lp->hw->phy->supported.tx_powers_size; i++) {
1159 if (lp->hw->phy->supported.tx_powers[i] == mbm)
1160 return at86rf230_write_subreg(lp, SR_TX_PWR_212, i);
1167 at86rf230_set_txpower(struct ieee802154_hw *hw, s32 mbm)
1169 struct at86rf230_local *lp = hw->priv;
1171 return lp->data->set_txpower(lp, mbm);
1175 at86rf230_set_lbt(struct ieee802154_hw *hw, bool on)
1177 struct at86rf230_local *lp = hw->priv;
1179 return at86rf230_write_subreg(lp, SR_CSMA_LBT_MODE, on);
1183 at86rf230_set_cca_mode(struct ieee802154_hw *hw,
1184 const struct wpan_phy_cca *cca)
1186 struct at86rf230_local *lp = hw->priv;
1189 /* mapping 802.15.4 to driver spec */
1190 switch (cca->mode) {
1191 case NL802154_CCA_ENERGY:
1194 case NL802154_CCA_CARRIER:
1197 case NL802154_CCA_ENERGY_CARRIER:
1199 case NL802154_CCA_OPT_ENERGY_CARRIER_AND:
1202 case NL802154_CCA_OPT_ENERGY_CARRIER_OR:
1213 return at86rf230_write_subreg(lp, SR_CCA_MODE, val);
1218 at86rf230_set_cca_ed_level(struct ieee802154_hw *hw, s32 mbm)
1220 struct at86rf230_local *lp = hw->priv;
1223 for (i = 0; i < hw->phy->supported.cca_ed_levels_size; i++) {
1224 if (hw->phy->supported.cca_ed_levels[i] == mbm)
1225 return at86rf230_write_subreg(lp, SR_CCA_ED_THRES, i);
1232 at86rf230_set_csma_params(struct ieee802154_hw *hw, u8 min_be, u8 max_be,
1235 struct at86rf230_local *lp = hw->priv;
1238 rc = at86rf230_write_subreg(lp, SR_MIN_BE, min_be);
1242 rc = at86rf230_write_subreg(lp, SR_MAX_BE, max_be);
1246 return at86rf230_write_subreg(lp, SR_MAX_CSMA_RETRIES, retries);
1250 at86rf230_set_frame_retries(struct ieee802154_hw *hw, s8 retries)
1252 struct at86rf230_local *lp = hw->priv;
1254 return at86rf230_write_subreg(lp, SR_MAX_FRAME_RETRIES, retries);
1258 at86rf230_set_promiscuous_mode(struct ieee802154_hw *hw, const bool on)
1260 struct at86rf230_local *lp = hw->priv;
1264 rc = at86rf230_write_subreg(lp, SR_AACK_DIS_ACK, 1);
1268 rc = at86rf230_write_subreg(lp, SR_AACK_PROM_MODE, 1);
1272 rc = at86rf230_write_subreg(lp, SR_AACK_PROM_MODE, 0);
1276 rc = at86rf230_write_subreg(lp, SR_AACK_DIS_ACK, 0);
1284 static const struct ieee802154_ops at86rf230_ops = {
1285 .owner = THIS_MODULE,
1286 .xmit_async = at86rf230_xmit,
1288 .set_channel = at86rf230_channel,
1289 .start = at86rf230_start,
1290 .stop = at86rf230_stop,
1291 .set_hw_addr_filt = at86rf230_set_hw_addr_filt,
1292 .set_txpower = at86rf230_set_txpower,
1293 .set_lbt = at86rf230_set_lbt,
1294 .set_cca_mode = at86rf230_set_cca_mode,
1295 .set_cca_ed_level = at86rf230_set_cca_ed_level,
1296 .set_csma_params = at86rf230_set_csma_params,
1297 .set_frame_retries = at86rf230_set_frame_retries,
1298 .set_promiscuous_mode = at86rf230_set_promiscuous_mode,
1301 static struct at86rf2xx_chip_data at86rf233_data = {
1302 .t_sleep_cycle = 330,
1303 .t_channel_switch = 11,
1304 .t_reset_to_off = 26,
1305 .t_off_to_aack = 80,
1306 .t_off_to_tx_on = 80,
1307 .t_off_to_sleep = 35,
1308 .t_sleep_to_off = 210,
1311 .rssi_base_val = -91,
1312 .set_channel = at86rf23x_set_channel,
1313 .set_txpower = at86rf23x_set_txpower,
1316 static struct at86rf2xx_chip_data at86rf231_data = {
1317 .t_sleep_cycle = 330,
1318 .t_channel_switch = 24,
1319 .t_reset_to_off = 37,
1320 .t_off_to_aack = 110,
1321 .t_off_to_tx_on = 110,
1322 .t_off_to_sleep = 35,
1323 .t_sleep_to_off = 380,
1326 .rssi_base_val = -91,
1327 .set_channel = at86rf23x_set_channel,
1328 .set_txpower = at86rf23x_set_txpower,
1331 static struct at86rf2xx_chip_data at86rf212_data = {
1332 .t_sleep_cycle = 330,
1333 .t_channel_switch = 11,
1334 .t_reset_to_off = 26,
1335 .t_off_to_aack = 200,
1336 .t_off_to_tx_on = 200,
1337 .t_off_to_sleep = 35,
1338 .t_sleep_to_off = 380,
1341 .rssi_base_val = -100,
1342 .set_channel = at86rf212_set_channel,
1343 .set_txpower = at86rf212_set_txpower,
1346 static int at86rf230_hw_init(struct at86rf230_local *lp, u8 xtal_trim)
1348 int rc, irq_type, irq_pol = IRQ_ACTIVE_HIGH;
1352 rc = at86rf230_sync_state_change(lp, STATE_FORCE_TRX_OFF);
1356 irq_type = irq_get_trigger_type(lp->spi->irq);
1357 if (irq_type == IRQ_TYPE_EDGE_RISING ||
1358 irq_type == IRQ_TYPE_EDGE_FALLING)
1359 dev_warn(&lp->spi->dev,
1360 "Using edge triggered irq's are not recommended!\n");
1361 if (irq_type == IRQ_TYPE_EDGE_FALLING ||
1362 irq_type == IRQ_TYPE_LEVEL_LOW)
1363 irq_pol = IRQ_ACTIVE_LOW;
1365 rc = at86rf230_write_subreg(lp, SR_IRQ_POLARITY, irq_pol);
1369 rc = at86rf230_write_subreg(lp, SR_RX_SAFE_MODE, 1);
1373 rc = at86rf230_write_subreg(lp, SR_IRQ_MASK, IRQ_TRX_END);
1377 /* reset values differs in at86rf231 and at86rf233 */
1378 rc = at86rf230_write_subreg(lp, SR_IRQ_MASK_MODE, 0);
1382 get_random_bytes(csma_seed, ARRAY_SIZE(csma_seed));
1383 rc = at86rf230_write_subreg(lp, SR_CSMA_SEED_0, csma_seed[0]);
1386 rc = at86rf230_write_subreg(lp, SR_CSMA_SEED_1, csma_seed[1]);
1390 /* CLKM changes are applied immediately */
1391 rc = at86rf230_write_subreg(lp, SR_CLKM_SHA_SEL, 0x00);
1396 rc = at86rf230_write_subreg(lp, SR_CLKM_CTRL, 0x00);
1399 /* Wait the next SLEEP cycle */
1400 usleep_range(lp->data->t_sleep_cycle,
1401 lp->data->t_sleep_cycle + 100);
1403 /* xtal_trim value is calculated by:
1404 * CL = 0.5 * (CX + CTRIM + CPAR)
1407 * CL = capacitor of used crystal
1408 * CX = connected capacitors at xtal pins
1409 * CPAR = in all at86rf2xx datasheets this is a constant value 3 pF,
1410 * but this is different on each board setup. You need to fine
1411 * tuning this value via CTRIM.
1412 * CTRIM = variable capacitor setting. Resolution is 0.3 pF range is
1416 * atben transceiver:
1420 * CPAR = 3 pF (We assume the magic constant from datasheet)
1423 * (12+0.9+3)/2 = 7.95 which is nearly at 8 pF
1427 * openlabs transceiver:
1431 * CPAR = 3 pF (We assume the magic constant from datasheet)
1434 * (22+4.5+3)/2 = 14.75 which is the nearest value to 16 pF
1438 rc = at86rf230_write_subreg(lp, SR_XTAL_TRIM, xtal_trim);
1442 rc = at86rf230_read_subreg(lp, SR_DVDD_OK, &dvdd);
1446 dev_err(&lp->spi->dev, "DVDD error\n");
1450 /* Force setting slotted operation bit to 0. Sometimes the atben
1451 * sets this bit and I don't know why. We set this always force
1452 * to zero while probing.
1454 return at86rf230_write_subreg(lp, SR_SLOTTED_OPERATION, 0);
1458 at86rf230_get_pdata(struct spi_device *spi, int *rstn, int *slp_tr,
1461 struct at86rf230_platform_data *pdata = spi->dev.platform_data;
1464 if (!IS_ENABLED(CONFIG_OF) || !spi->dev.of_node) {
1468 *rstn = pdata->rstn;
1469 *slp_tr = pdata->slp_tr;
1470 *xtal_trim = pdata->xtal_trim;
1474 *rstn = of_get_named_gpio(spi->dev.of_node, "reset-gpio", 0);
1475 *slp_tr = of_get_named_gpio(spi->dev.of_node, "sleep-gpio", 0);
1476 ret = of_property_read_u8(spi->dev.of_node, "xtal-trim", xtal_trim);
1477 if (ret < 0 && ret != -EINVAL)
1484 at86rf230_detect_device(struct at86rf230_local *lp)
1486 unsigned int part, version, val;
1491 rc = __at86rf230_read(lp, RG_MAN_ID_0, &val);
1496 rc = __at86rf230_read(lp, RG_MAN_ID_1, &val);
1499 man_id |= (val << 8);
1501 rc = __at86rf230_read(lp, RG_PART_NUM, &part);
1505 rc = __at86rf230_read(lp, RG_VERSION_NUM, &version);
1509 if (man_id != 0x001f) {
1510 dev_err(&lp->spi->dev, "Non-Atmel dev found (MAN_ID %02x %02x)\n",
1511 man_id >> 8, man_id & 0xFF);
1515 lp->hw->flags = IEEE802154_HW_TX_OMIT_CKSUM |
1516 IEEE802154_HW_CSMA_PARAMS |
1517 IEEE802154_HW_FRAME_RETRIES | IEEE802154_HW_AFILT |
1518 IEEE802154_HW_PROMISCUOUS;
1520 lp->hw->phy->flags = WPAN_PHY_FLAG_TXPOWER |
1521 WPAN_PHY_FLAG_CCA_ED_LEVEL |
1522 WPAN_PHY_FLAG_CCA_MODE;
1524 lp->hw->phy->supported.cca_modes = BIT(NL802154_CCA_ENERGY) |
1525 BIT(NL802154_CCA_CARRIER) | BIT(NL802154_CCA_ENERGY_CARRIER);
1526 lp->hw->phy->supported.cca_opts = BIT(NL802154_CCA_OPT_ENERGY_CARRIER_AND) |
1527 BIT(NL802154_CCA_OPT_ENERGY_CARRIER_OR);
1529 lp->hw->phy->supported.cca_ed_levels = at86rf23x_ed_levels;
1530 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf23x_ed_levels);
1532 lp->hw->phy->cca.mode = NL802154_CCA_ENERGY;
1541 lp->data = &at86rf231_data;
1542 lp->hw->phy->supported.channels[0] = 0x7FFF800;
1543 lp->hw->phy->current_channel = 11;
1544 lp->hw->phy->symbol_duration = 16;
1545 lp->hw->phy->supported.tx_powers = at86rf231_powers;
1546 lp->hw->phy->supported.tx_powers_size = ARRAY_SIZE(at86rf231_powers);
1550 lp->data = &at86rf212_data;
1551 lp->hw->flags |= IEEE802154_HW_LBT;
1552 lp->hw->phy->supported.channels[0] = 0x00007FF;
1553 lp->hw->phy->supported.channels[2] = 0x00007FF;
1554 lp->hw->phy->current_channel = 5;
1555 lp->hw->phy->symbol_duration = 25;
1556 lp->hw->phy->supported.lbt = NL802154_SUPPORTED_BOOL_BOTH;
1557 lp->hw->phy->supported.tx_powers = at86rf212_powers;
1558 lp->hw->phy->supported.tx_powers_size = ARRAY_SIZE(at86rf212_powers);
1559 lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_100;
1560 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_100);
1564 lp->data = &at86rf233_data;
1565 lp->hw->phy->supported.channels[0] = 0x7FFF800;
1566 lp->hw->phy->current_channel = 13;
1567 lp->hw->phy->symbol_duration = 16;
1568 lp->hw->phy->supported.tx_powers = at86rf233_powers;
1569 lp->hw->phy->supported.tx_powers_size = ARRAY_SIZE(at86rf233_powers);
1577 lp->hw->phy->cca_ed_level = lp->hw->phy->supported.cca_ed_levels[7];
1578 lp->hw->phy->transmit_power = lp->hw->phy->supported.tx_powers[0];
1581 dev_info(&lp->spi->dev, "Detected %s chip version %d\n", chip, version);
1587 at86rf230_setup_spi_messages(struct at86rf230_local *lp)
1590 lp->state.irq = lp->spi->irq;
1591 spi_message_init(&lp->state.msg);
1592 lp->state.msg.context = &lp->state;
1593 lp->state.trx.len = 2;
1594 lp->state.trx.tx_buf = lp->state.buf;
1595 lp->state.trx.rx_buf = lp->state.buf;
1596 spi_message_add_tail(&lp->state.trx, &lp->state.msg);
1597 hrtimer_init(&lp->state.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
1598 lp->state.timer.function = at86rf230_async_state_timer;
1601 lp->irq.irq = lp->spi->irq;
1602 spi_message_init(&lp->irq.msg);
1603 lp->irq.msg.context = &lp->irq;
1604 lp->irq.trx.len = 2;
1605 lp->irq.trx.tx_buf = lp->irq.buf;
1606 lp->irq.trx.rx_buf = lp->irq.buf;
1607 spi_message_add_tail(&lp->irq.trx, &lp->irq.msg);
1608 hrtimer_init(&lp->irq.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
1609 lp->irq.timer.function = at86rf230_async_state_timer;
1612 lp->tx.irq = lp->spi->irq;
1613 spi_message_init(&lp->tx.msg);
1614 lp->tx.msg.context = &lp->tx;
1616 lp->tx.trx.tx_buf = lp->tx.buf;
1617 lp->tx.trx.rx_buf = lp->tx.buf;
1618 spi_message_add_tail(&lp->tx.trx, &lp->tx.msg);
1619 hrtimer_init(&lp->tx.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
1620 lp->tx.timer.function = at86rf230_async_state_timer;
1623 static int at86rf230_probe(struct spi_device *spi)
1625 struct ieee802154_hw *hw;
1626 struct at86rf230_local *lp;
1627 unsigned int status;
1628 int rc, irq_type, rstn, slp_tr;
1632 dev_err(&spi->dev, "no IRQ specified\n");
1636 rc = at86rf230_get_pdata(spi, &rstn, &slp_tr, &xtal_trim);
1638 dev_err(&spi->dev, "failed to parse platform_data: %d\n", rc);
1642 if (gpio_is_valid(rstn)) {
1643 rc = devm_gpio_request_one(&spi->dev, rstn,
1644 GPIOF_OUT_INIT_HIGH, "rstn");
1649 if (gpio_is_valid(slp_tr)) {
1650 rc = devm_gpio_request_one(&spi->dev, slp_tr,
1651 GPIOF_OUT_INIT_LOW, "slp_tr");
1657 if (gpio_is_valid(rstn)) {
1659 gpio_set_value(rstn, 0);
1661 gpio_set_value(rstn, 1);
1662 usleep_range(120, 240);
1665 hw = ieee802154_alloc_hw(sizeof(*lp), &at86rf230_ops);
1672 lp->slp_tr = slp_tr;
1673 hw->parent = &spi->dev;
1674 ieee802154_random_extended_addr(&hw->phy->perm_extended_addr);
1676 lp->regmap = devm_regmap_init_spi(spi, &at86rf230_regmap_spi_config);
1677 if (IS_ERR(lp->regmap)) {
1678 rc = PTR_ERR(lp->regmap);
1679 dev_err(&spi->dev, "Failed to allocate register map: %d\n",
1684 at86rf230_setup_spi_messages(lp);
1686 rc = at86rf230_detect_device(lp);
1690 init_completion(&lp->state_complete);
1692 spi_set_drvdata(spi, lp);
1694 rc = at86rf230_hw_init(lp, xtal_trim);
1698 /* Read irq status register to reset irq line */
1699 rc = at86rf230_read_subreg(lp, RG_IRQ_STATUS, 0xff, 0, &status);
1703 irq_type = irq_get_trigger_type(spi->irq);
1705 irq_type = IRQF_TRIGGER_HIGH;
1707 rc = devm_request_irq(&spi->dev, spi->irq, at86rf230_isr,
1708 IRQF_SHARED | irq_type, dev_name(&spi->dev), lp);
1712 /* disable_irq by default and wait for starting hardware */
1713 disable_irq(spi->irq);
1715 /* going into sleep by default */
1716 at86rf230_sleep(lp);
1718 rc = ieee802154_register_hw(lp->hw);
1725 ieee802154_free_hw(lp->hw);
1730 static int at86rf230_remove(struct spi_device *spi)
1732 struct at86rf230_local *lp = spi_get_drvdata(spi);
1734 /* mask all at86rf230 irq's */
1735 at86rf230_write_subreg(lp, SR_IRQ_MASK, 0);
1736 ieee802154_unregister_hw(lp->hw);
1737 ieee802154_free_hw(lp->hw);
1738 dev_dbg(&spi->dev, "unregistered at86rf230\n");
1743 static const struct of_device_id at86rf230_of_match[] = {
1744 { .compatible = "atmel,at86rf230", },
1745 { .compatible = "atmel,at86rf231", },
1746 { .compatible = "atmel,at86rf233", },
1747 { .compatible = "atmel,at86rf212", },
1750 MODULE_DEVICE_TABLE(of, at86rf230_of_match);
1752 static const struct spi_device_id at86rf230_device_id[] = {
1753 { .name = "at86rf230", },
1754 { .name = "at86rf231", },
1755 { .name = "at86rf233", },
1756 { .name = "at86rf212", },
1759 MODULE_DEVICE_TABLE(spi, at86rf230_device_id);
1761 static struct spi_driver at86rf230_driver = {
1762 .id_table = at86rf230_device_id,
1764 .of_match_table = of_match_ptr(at86rf230_of_match),
1765 .name = "at86rf230",
1766 .owner = THIS_MODULE,
1768 .probe = at86rf230_probe,
1769 .remove = at86rf230_remove,
1772 module_spi_driver(at86rf230_driver);
1774 MODULE_DESCRIPTION("AT86RF230 Transceiver Driver");
1775 MODULE_LICENSE("GPL v2");