xref: /openbmc/linux/drivers/net/ieee802154/cc2520.c (revision 04a7279f) 
1 /* Driver for TI CC2520 802.15.4 Wireless-PAN Networking controller
2  *
3  * Copyright (C) 2014 Varka Bhadram <varkab@cdac.in>
4  *		      Md.Jamal Mohiuddin <mjmohiuddin@cdac.in>
5  *		      P Sowjanya <sowjanyap@cdac.in>
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License as published by
9  * the Free Software Foundation; either version 2 of the License, or
10  * (at your option) any later version.
11  *
12  */
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/gpio.h>
16 #include <linux/delay.h>
17 #include <linux/spi/spi.h>
18 #include <linux/spi/cc2520.h>
19 #include <linux/workqueue.h>
20 #include <linux/interrupt.h>
21 #include <linux/skbuff.h>
22 #include <linux/of_gpio.h>
23 #include <linux/ieee802154.h>
24 #include <linux/crc-ccitt.h>
25 #include <asm/unaligned.h>
26 
27 #include <net/mac802154.h>
28 #include <net/cfg802154.h>
29 
30 #define	SPI_COMMAND_BUFFER	3
31 #define	HIGH			1
32 #define	LOW			0
33 #define	STATE_IDLE		0
34 #define	RSSI_VALID		0
35 #define	RSSI_OFFSET		78
36 
37 #define	CC2520_RAM_SIZE		640
38 #define	CC2520_FIFO_SIZE	128
39 
40 #define	CC2520RAM_TXFIFO	0x100
41 #define	CC2520RAM_RXFIFO	0x180
42 #define	CC2520RAM_IEEEADDR	0x3EA
43 #define	CC2520RAM_PANID		0x3F2
44 #define	CC2520RAM_SHORTADDR	0x3F4
45 
46 #define	CC2520_FREG_MASK	0x3F
47 
48 /* status byte values */
49 #define	CC2520_STATUS_XOSC32M_STABLE	BIT(7)
50 #define	CC2520_STATUS_RSSI_VALID	BIT(6)
51 #define	CC2520_STATUS_TX_UNDERFLOW	BIT(3)
52 
53 /* IEEE-802.15.4 defined constants (2.4 GHz logical channels) */
54 #define	CC2520_MINCHANNEL		11
55 #define	CC2520_MAXCHANNEL		26
56 #define	CC2520_CHANNEL_SPACING		5
57 
58 /* command strobes */
59 #define	CC2520_CMD_SNOP			0x00
60 #define	CC2520_CMD_IBUFLD		0x02
61 #define	CC2520_CMD_SIBUFEX		0x03
62 #define	CC2520_CMD_SSAMPLECCA		0x04
63 #define	CC2520_CMD_SRES			0x0f
64 #define	CC2520_CMD_MEMORY_MASK		0x0f
65 #define	CC2520_CMD_MEMORY_READ		0x10
66 #define	CC2520_CMD_MEMORY_WRITE		0x20
67 #define	CC2520_CMD_RXBUF		0x30
68 #define	CC2520_CMD_RXBUFCP		0x38
69 #define	CC2520_CMD_RXBUFMOV		0x32
70 #define	CC2520_CMD_TXBUF		0x3A
71 #define	CC2520_CMD_TXBUFCP		0x3E
72 #define	CC2520_CMD_RANDOM		0x3C
73 #define	CC2520_CMD_SXOSCON		0x40
74 #define	CC2520_CMD_STXCAL		0x41
75 #define	CC2520_CMD_SRXON		0x42
76 #define	CC2520_CMD_STXON		0x43
77 #define	CC2520_CMD_STXONCCA		0x44
78 #define	CC2520_CMD_SRFOFF		0x45
79 #define	CC2520_CMD_SXOSCOFF		0x46
80 #define	CC2520_CMD_SFLUSHRX		0x47
81 #define	CC2520_CMD_SFLUSHTX		0x48
82 #define	CC2520_CMD_SACK			0x49
83 #define	CC2520_CMD_SACKPEND		0x4A
84 #define	CC2520_CMD_SNACK		0x4B
85 #define	CC2520_CMD_SRXMASKBITSET	0x4C
86 #define	CC2520_CMD_SRXMASKBITCLR	0x4D
87 #define	CC2520_CMD_RXMASKAND		0x4E
88 #define	CC2520_CMD_RXMASKOR		0x4F
89 #define	CC2520_CMD_MEMCP		0x50
90 #define	CC2520_CMD_MEMCPR		0x52
91 #define	CC2520_CMD_MEMXCP		0x54
92 #define	CC2520_CMD_MEMXWR		0x56
93 #define	CC2520_CMD_BCLR			0x58
94 #define	CC2520_CMD_BSET			0x59
95 #define	CC2520_CMD_CTR_UCTR		0x60
96 #define	CC2520_CMD_CBCMAC		0x64
97 #define	CC2520_CMD_UCBCMAC		0x66
98 #define	CC2520_CMD_CCM			0x68
99 #define	CC2520_CMD_UCCM			0x6A
100 #define	CC2520_CMD_ECB			0x70
101 #define	CC2520_CMD_ECBO			0x72
102 #define	CC2520_CMD_ECBX			0x74
103 #define	CC2520_CMD_INC			0x78
104 #define	CC2520_CMD_ABORT		0x7F
105 #define	CC2520_CMD_REGISTER_READ	0x80
106 #define	CC2520_CMD_REGISTER_WRITE	0xC0
107 
108 /* status registers */
109 #define	CC2520_CHIPID			0x40
110 #define	CC2520_VERSION			0x42
111 #define	CC2520_EXTCLOCK			0x44
112 #define	CC2520_MDMCTRL0			0x46
113 #define	CC2520_MDMCTRL1			0x47
114 #define	CC2520_FREQEST			0x48
115 #define	CC2520_RXCTRL			0x4A
116 #define	CC2520_FSCTRL			0x4C
117 #define	CC2520_FSCAL0			0x4E
118 #define	CC2520_FSCAL1			0x4F
119 #define	CC2520_FSCAL2			0x50
120 #define	CC2520_FSCAL3			0x51
121 #define	CC2520_AGCCTRL0			0x52
122 #define	CC2520_AGCCTRL1			0x53
123 #define	CC2520_AGCCTRL2			0x54
124 #define	CC2520_AGCCTRL3			0x55
125 #define	CC2520_ADCTEST0			0x56
126 #define	CC2520_ADCTEST1			0x57
127 #define	CC2520_ADCTEST2			0x58
128 #define	CC2520_MDMTEST0			0x5A
129 #define	CC2520_MDMTEST1			0x5B
130 #define	CC2520_DACTEST0			0x5C
131 #define	CC2520_DACTEST1			0x5D
132 #define	CC2520_ATEST			0x5E
133 #define	CC2520_DACTEST2			0x5F
134 #define	CC2520_PTEST0			0x60
135 #define	CC2520_PTEST1			0x61
136 #define	CC2520_RESERVED			0x62
137 #define	CC2520_DPUBIST			0x7A
138 #define	CC2520_ACTBIST			0x7C
139 #define	CC2520_RAMBIST			0x7E
140 
141 /* frame registers */
142 #define	CC2520_FRMFILT0			0x00
143 #define	CC2520_FRMFILT1			0x01
144 #define	CC2520_SRCMATCH			0x02
145 #define	CC2520_SRCSHORTEN0		0x04
146 #define	CC2520_SRCSHORTEN1		0x05
147 #define	CC2520_SRCSHORTEN2		0x06
148 #define	CC2520_SRCEXTEN0		0x08
149 #define	CC2520_SRCEXTEN1		0x09
150 #define	CC2520_SRCEXTEN2		0x0A
151 #define	CC2520_FRMCTRL0			0x0C
152 #define	CC2520_FRMCTRL1			0x0D
153 #define	CC2520_RXENABLE0		0x0E
154 #define	CC2520_RXENABLE1		0x0F
155 #define	CC2520_EXCFLAG0			0x10
156 #define	CC2520_EXCFLAG1			0x11
157 #define	CC2520_EXCFLAG2			0x12
158 #define	CC2520_EXCMASKA0		0x14
159 #define	CC2520_EXCMASKA1		0x15
160 #define	CC2520_EXCMASKA2		0x16
161 #define	CC2520_EXCMASKB0		0x18
162 #define	CC2520_EXCMASKB1		0x19
163 #define	CC2520_EXCMASKB2		0x1A
164 #define	CC2520_EXCBINDX0		0x1C
165 #define	CC2520_EXCBINDX1		0x1D
166 #define	CC2520_EXCBINDY0		0x1E
167 #define	CC2520_EXCBINDY1		0x1F
168 #define	CC2520_GPIOCTRL0		0x20
169 #define	CC2520_GPIOCTRL1		0x21
170 #define	CC2520_GPIOCTRL2		0x22
171 #define	CC2520_GPIOCTRL3		0x23
172 #define	CC2520_GPIOCTRL4		0x24
173 #define	CC2520_GPIOCTRL5		0x25
174 #define	CC2520_GPIOPOLARITY		0x26
175 #define	CC2520_GPIOCTRL			0x28
176 #define	CC2520_DPUCON			0x2A
177 #define	CC2520_DPUSTAT			0x2C
178 #define	CC2520_FREQCTRL			0x2E
179 #define	CC2520_FREQTUNE			0x2F
180 #define	CC2520_TXPOWER			0x30
181 #define	CC2520_TXCTRL			0x31
182 #define	CC2520_FSMSTAT0			0x32
183 #define	CC2520_FSMSTAT1			0x33
184 #define	CC2520_FIFOPCTRL		0x34
185 #define	CC2520_FSMCTRL			0x35
186 #define	CC2520_CCACTRL0			0x36
187 #define	CC2520_CCACTRL1			0x37
188 #define	CC2520_RSSI			0x38
189 #define	CC2520_RSSISTAT			0x39
190 #define	CC2520_RXFIRST			0x3C
191 #define	CC2520_RXFIFOCNT		0x3E
192 #define	CC2520_TXFIFOCNT		0x3F
193 
194 /* CC2520_FRMFILT0 */
195 #define FRMFILT0_FRAME_FILTER_EN	BIT(0)
196 #define FRMFILT0_PAN_COORDINATOR	BIT(1)
197 
198 /* CC2520_FRMCTRL0 */
199 #define FRMCTRL0_AUTOACK		BIT(5)
200 #define FRMCTRL0_AUTOCRC		BIT(6)
201 
202 /* CC2520_FRMCTRL1 */
203 #define FRMCTRL1_SET_RXENMASK_ON_TX	BIT(0)
204 #define FRMCTRL1_IGNORE_TX_UNDERF	BIT(1)
205 
206 /* Driver private information */
207 struct cc2520_private {
208 	struct spi_device *spi;		/* SPI device structure */
209 	struct ieee802154_hw *hw;	/* IEEE-802.15.4 device */
210 	u8 *buf;			/* SPI TX/Rx data buffer */
211 	struct mutex buffer_mutex;	/* SPI buffer mutex */
212 	bool is_tx;			/* Flag for sync b/w Tx and Rx */
213 	bool amplified;			/* Flag for CC2591 */
214 	int fifo_pin;			/* FIFO GPIO pin number */
215 	struct work_struct fifop_irqwork;/* Workqueue for FIFOP */
216 	spinlock_t lock;		/* Lock for is_tx*/
217 	struct completion tx_complete;	/* Work completion for Tx */
218 	bool promiscuous;               /* Flag for promiscuous mode */
219 };
220 
221 /* Generic Functions */
222 static int
223 cc2520_cmd_strobe(struct cc2520_private *priv, u8 cmd)
224 {
225 	int ret;
226 	u8 status = 0xff;
227 	struct spi_message msg;
228 	struct spi_transfer xfer = {
229 		.len = 0,
230 		.tx_buf = priv->buf,
231 		.rx_buf = priv->buf,
232 	};
233 
234 	spi_message_init(&msg);
235 	spi_message_add_tail(&xfer, &msg);
236 
237 	mutex_lock(&priv->buffer_mutex);
238 	priv->buf[xfer.len++] = cmd;
239 	dev_vdbg(&priv->spi->dev,
240 		 "command strobe buf[0] = %02x\n",
241 		 priv->buf[0]);
242 
243 	ret = spi_sync(priv->spi, &msg);
244 	if (!ret)
245 		status = priv->buf[0];
246 	dev_vdbg(&priv->spi->dev,
247 		 "buf[0] = %02x\n", priv->buf[0]);
248 	mutex_unlock(&priv->buffer_mutex);
249 
250 	return ret;
251 }
252 
253 static int
254 cc2520_get_status(struct cc2520_private *priv, u8 *status)
255 {
256 	int ret;
257 	struct spi_message msg;
258 	struct spi_transfer xfer = {
259 		.len = 0,
260 		.tx_buf = priv->buf,
261 		.rx_buf = priv->buf,
262 	};
263 
264 	spi_message_init(&msg);
265 	spi_message_add_tail(&xfer, &msg);
266 
267 	mutex_lock(&priv->buffer_mutex);
268 	priv->buf[xfer.len++] = CC2520_CMD_SNOP;
269 	dev_vdbg(&priv->spi->dev,
270 		 "get status command buf[0] = %02x\n", priv->buf[0]);
271 
272 	ret = spi_sync(priv->spi, &msg);
273 	if (!ret)
274 		*status = priv->buf[0];
275 	dev_vdbg(&priv->spi->dev,
276 		 "buf[0] = %02x\n", priv->buf[0]);
277 	mutex_unlock(&priv->buffer_mutex);
278 
279 	return ret;
280 }
281 
282 static int
283 cc2520_write_register(struct cc2520_private *priv, u8 reg, u8 value)
284 {
285 	int status;
286 	struct spi_message msg;
287 	struct spi_transfer xfer = {
288 		.len = 0,
289 		.tx_buf = priv->buf,
290 		.rx_buf = priv->buf,
291 	};
292 
293 	spi_message_init(&msg);
294 	spi_message_add_tail(&xfer, &msg);
295 
296 	mutex_lock(&priv->buffer_mutex);
297 
298 	if (reg <= CC2520_FREG_MASK) {
299 		priv->buf[xfer.len++] = CC2520_CMD_REGISTER_WRITE | reg;
300 		priv->buf[xfer.len++] = value;
301 	} else {
302 		priv->buf[xfer.len++] = CC2520_CMD_MEMORY_WRITE;
303 		priv->buf[xfer.len++] = reg;
304 		priv->buf[xfer.len++] = value;
305 	}
306 	status = spi_sync(priv->spi, &msg);
307 	if (msg.status)
308 		status = msg.status;
309 
310 	mutex_unlock(&priv->buffer_mutex);
311 
312 	return status;
313 }
314 
315 static int
316 cc2520_write_ram(struct cc2520_private *priv, u16 reg, u8 len, u8 *data)
317 {
318 	int status;
319 	struct spi_message msg;
320 	struct spi_transfer xfer_head = {
321 		.len        = 0,
322 		.tx_buf        = priv->buf,
323 		.rx_buf        = priv->buf,
324 	};
325 
326 	struct spi_transfer xfer_buf = {
327 		.len = len,
328 		.tx_buf = data,
329 	};
330 
331 	mutex_lock(&priv->buffer_mutex);
332 	priv->buf[xfer_head.len++] = (CC2520_CMD_MEMORY_WRITE |
333 						((reg >> 8) & 0xff));
334 	priv->buf[xfer_head.len++] = reg & 0xff;
335 
336 	spi_message_init(&msg);
337 	spi_message_add_tail(&xfer_head, &msg);
338 	spi_message_add_tail(&xfer_buf, &msg);
339 
340 	status = spi_sync(priv->spi, &msg);
341 	dev_dbg(&priv->spi->dev, "spi status = %d\n", status);
342 	if (msg.status)
343 		status = msg.status;
344 
345 	mutex_unlock(&priv->buffer_mutex);
346 	return status;
347 }
348 
349 static int
350 cc2520_read_register(struct cc2520_private *priv, u8 reg, u8 *data)
351 {
352 	int status;
353 	struct spi_message msg;
354 	struct spi_transfer xfer1 = {
355 		.len = 0,
356 		.tx_buf = priv->buf,
357 		.rx_buf = priv->buf,
358 	};
359 
360 	struct spi_transfer xfer2 = {
361 		.len = 1,
362 		.rx_buf = data,
363 	};
364 
365 	spi_message_init(&msg);
366 	spi_message_add_tail(&xfer1, &msg);
367 	spi_message_add_tail(&xfer2, &msg);
368 
369 	mutex_lock(&priv->buffer_mutex);
370 	priv->buf[xfer1.len++] = CC2520_CMD_MEMORY_READ;
371 	priv->buf[xfer1.len++] = reg;
372 
373 	status = spi_sync(priv->spi, &msg);
374 	dev_dbg(&priv->spi->dev,
375 		"spi status = %d\n", status);
376 	if (msg.status)
377 		status = msg.status;
378 
379 	mutex_unlock(&priv->buffer_mutex);
380 
381 	return status;
382 }
383 
384 static int
385 cc2520_write_txfifo(struct cc2520_private *priv, u8 pkt_len, u8 *data, u8 len)
386 {
387 	int status;
388 
389 	/* length byte must include FCS even
390 	 * if it is calculated in the hardware
391 	 */
392 	int len_byte = pkt_len;
393 
394 	struct spi_message msg;
395 
396 	struct spi_transfer xfer_head = {
397 		.len = 0,
398 		.tx_buf = priv->buf,
399 		.rx_buf = priv->buf,
400 	};
401 	struct spi_transfer xfer_len = {
402 		.len = 1,
403 		.tx_buf = &len_byte,
404 	};
405 	struct spi_transfer xfer_buf = {
406 		.len = len,
407 		.tx_buf = data,
408 	};
409 
410 	spi_message_init(&msg);
411 	spi_message_add_tail(&xfer_head, &msg);
412 	spi_message_add_tail(&xfer_len, &msg);
413 	spi_message_add_tail(&xfer_buf, &msg);
414 
415 	mutex_lock(&priv->buffer_mutex);
416 	priv->buf[xfer_head.len++] = CC2520_CMD_TXBUF;
417 	dev_vdbg(&priv->spi->dev,
418 		 "TX_FIFO cmd buf[0] = %02x\n", priv->buf[0]);
419 
420 	status = spi_sync(priv->spi, &msg);
421 	dev_vdbg(&priv->spi->dev, "status = %d\n", status);
422 	if (msg.status)
423 		status = msg.status;
424 	dev_vdbg(&priv->spi->dev, "status = %d\n", status);
425 	dev_vdbg(&priv->spi->dev, "buf[0] = %02x\n", priv->buf[0]);
426 	mutex_unlock(&priv->buffer_mutex);
427 
428 	return status;
429 }
430 
431 static int
432 cc2520_read_rxfifo(struct cc2520_private *priv, u8 *data, u8 len)
433 {
434 	int status;
435 	struct spi_message msg;
436 
437 	struct spi_transfer xfer_head = {
438 		.len = 0,
439 		.tx_buf = priv->buf,
440 		.rx_buf = priv->buf,
441 	};
442 	struct spi_transfer xfer_buf = {
443 		.len = len,
444 		.rx_buf = data,
445 	};
446 
447 	spi_message_init(&msg);
448 	spi_message_add_tail(&xfer_head, &msg);
449 	spi_message_add_tail(&xfer_buf, &msg);
450 
451 	mutex_lock(&priv->buffer_mutex);
452 	priv->buf[xfer_head.len++] = CC2520_CMD_RXBUF;
453 
454 	dev_vdbg(&priv->spi->dev, "read rxfifo buf[0] = %02x\n", priv->buf[0]);
455 	dev_vdbg(&priv->spi->dev, "buf[1] = %02x\n", priv->buf[1]);
456 
457 	status = spi_sync(priv->spi, &msg);
458 	dev_vdbg(&priv->spi->dev, "status = %d\n", status);
459 	if (msg.status)
460 		status = msg.status;
461 	dev_vdbg(&priv->spi->dev, "status = %d\n", status);
462 	dev_vdbg(&priv->spi->dev,
463 		 "return status buf[0] = %02x\n", priv->buf[0]);
464 	dev_vdbg(&priv->spi->dev, "length buf[1] = %02x\n", priv->buf[1]);
465 
466 	mutex_unlock(&priv->buffer_mutex);
467 
468 	return status;
469 }
470 
471 static int cc2520_start(struct ieee802154_hw *hw)
472 {
473 	return cc2520_cmd_strobe(hw->priv, CC2520_CMD_SRXON);
474 }
475 
476 static void cc2520_stop(struct ieee802154_hw *hw)
477 {
478 	cc2520_cmd_strobe(hw->priv, CC2520_CMD_SRFOFF);
479 }
480 
481 static int
482 cc2520_tx(struct ieee802154_hw *hw, struct sk_buff *skb)
483 {
484 	struct cc2520_private *priv = hw->priv;
485 	unsigned long flags;
486 	int rc;
487 	u8 status = 0;
488 	u8 pkt_len;
489 
490 	/* In promiscuous mode we disable AUTOCRC so we can get the raw CRC
491 	 * values on RX. This means we need to manually add the CRC on TX.
492 	 */
493 	if (priv->promiscuous) {
494 		u16 crc = crc_ccitt(0, skb->data, skb->len);
495 
496 		put_unaligned_le16(crc, skb_put(skb, 2));
497 		pkt_len = skb->len;
498 	} else {
499 		pkt_len = skb->len + 2;
500 	}
501 
502 	rc = cc2520_cmd_strobe(priv, CC2520_CMD_SFLUSHTX);
503 	if (rc)
504 		goto err_tx;
505 
506 	rc = cc2520_write_txfifo(priv, pkt_len, skb->data, skb->len);
507 	if (rc)
508 		goto err_tx;
509 
510 	rc = cc2520_get_status(priv, &status);
511 	if (rc)
512 		goto err_tx;
513 
514 	if (status & CC2520_STATUS_TX_UNDERFLOW) {
515 		dev_err(&priv->spi->dev, "cc2520 tx underflow exception\n");
516 		goto err_tx;
517 	}
518 
519 	spin_lock_irqsave(&priv->lock, flags);
520 	WARN_ON(priv->is_tx);
521 	priv->is_tx = 1;
522 	spin_unlock_irqrestore(&priv->lock, flags);
523 
524 	rc = cc2520_cmd_strobe(priv, CC2520_CMD_STXONCCA);
525 	if (rc)
526 		goto err;
527 
528 	rc = wait_for_completion_interruptible(&priv->tx_complete);
529 	if (rc < 0)
530 		goto err;
531 
532 	cc2520_cmd_strobe(priv, CC2520_CMD_SFLUSHTX);
533 	cc2520_cmd_strobe(priv, CC2520_CMD_SRXON);
534 
535 	return rc;
536 err:
537 	spin_lock_irqsave(&priv->lock, flags);
538 	priv->is_tx = 0;
539 	spin_unlock_irqrestore(&priv->lock, flags);
540 err_tx:
541 	return rc;
542 }
543 
544 static int cc2520_rx(struct cc2520_private *priv)
545 {
546 	u8 len = 0, lqi = 0, bytes = 1;
547 	struct sk_buff *skb;
548 
549 	/* Read single length byte from the radio. */
550 	cc2520_read_rxfifo(priv, &len, bytes);
551 
552 	if (!ieee802154_is_valid_psdu_len(len)) {
553 		/* Corrupted frame received, clear frame buffer by
554 		 * reading entire buffer.
555 		 */
556 		dev_dbg(&priv->spi->dev, "corrupted frame received\n");
557 		len = IEEE802154_MTU;
558 	}
559 
560 	skb = dev_alloc_skb(len);
561 	if (!skb)
562 		return -ENOMEM;
563 
564 	if (cc2520_read_rxfifo(priv, skb_put(skb, len), len)) {
565 		dev_dbg(&priv->spi->dev, "frame reception failed\n");
566 		kfree_skb(skb);
567 		return -EINVAL;
568 	}
569 
570 	/* In promiscuous mode, we configure the radio to include the
571 	 * CRC (AUTOCRC==0) and we pass on the packet unconditionally. If not
572 	 * in promiscuous mode, we check the CRC here, but leave the
573 	 * RSSI/LQI/CRC_OK bytes as they will get removed in the mac layer.
574 	 */
575 	if (!priv->promiscuous) {
576 		bool crc_ok;
577 
578 		/* Check if the CRC is valid. With AUTOCRC set, the most
579 		 * significant bit of the last byte returned from the CC2520
580 		 * is CRC_OK flag. See section 20.3.4 of the datasheet.
581 		 */
582 		crc_ok = skb->data[len - 1] & BIT(7);
583 
584 		/* If we failed CRC drop the packet in the driver layer. */
585 		if (!crc_ok) {
586 			dev_dbg(&priv->spi->dev, "CRC check failed\n");
587 			kfree_skb(skb);
588 			return -EINVAL;
589 		}
590 
591 		/* To calculate LQI, the lower 7 bits of the last byte (the
592 		 * correlation value provided by the radio) must be scaled to
593 		 * the range 0-255. According to section 20.6, the correlation
594 		 * value ranges from 50-110. Ideally this would be calibrated
595 		 * per hardware design, but we use roughly the datasheet values
596 		 * to get close enough while avoiding floating point.
597 		 */
598 		lqi = skb->data[len - 1] & 0x7f;
599 		if (lqi < 50)
600 			lqi = 50;
601 		else if (lqi > 113)
602 			lqi = 113;
603 		lqi = (lqi - 50) * 4;
604 	}
605 
606 	ieee802154_rx_irqsafe(priv->hw, skb, lqi);
607 
608 	dev_vdbg(&priv->spi->dev, "RXFIFO: %x %x\n", len, lqi);
609 
610 	return 0;
611 }
612 
613 static int
614 cc2520_ed(struct ieee802154_hw *hw, u8 *level)
615 {
616 	struct cc2520_private *priv = hw->priv;
617 	u8 status = 0xff;
618 	u8 rssi;
619 	int ret;
620 
621 	ret = cc2520_read_register(priv, CC2520_RSSISTAT, &status);
622 	if (ret)
623 		return ret;
624 
625 	if (status != RSSI_VALID)
626 		return -EINVAL;
627 
628 	ret = cc2520_read_register(priv, CC2520_RSSI, &rssi);
629 	if (ret)
630 		return ret;
631 
632 	/* level = RSSI(rssi) - OFFSET [dBm] : offset is 76dBm */
633 	*level = rssi - RSSI_OFFSET;
634 
635 	return 0;
636 }
637 
638 static int
639 cc2520_set_channel(struct ieee802154_hw *hw, u8 page, u8 channel)
640 {
641 	struct cc2520_private *priv = hw->priv;
642 	int ret;
643 
644 	dev_dbg(&priv->spi->dev, "trying to set channel\n");
645 
646 	WARN_ON(page != 0);
647 	WARN_ON(channel < CC2520_MINCHANNEL);
648 	WARN_ON(channel > CC2520_MAXCHANNEL);
649 
650 	ret = cc2520_write_register(priv, CC2520_FREQCTRL,
651 				    11 + 5 * (channel - 11));
652 
653 	return ret;
654 }
655 
656 static int
657 cc2520_filter(struct ieee802154_hw *hw,
658 	      struct ieee802154_hw_addr_filt *filt, unsigned long changed)
659 {
660 	struct cc2520_private *priv = hw->priv;
661 	int ret = 0;
662 
663 	if (changed & IEEE802154_AFILT_PANID_CHANGED) {
664 		u16 panid = le16_to_cpu(filt->pan_id);
665 
666 		dev_vdbg(&priv->spi->dev, "%s called for pan id\n", __func__);
667 		ret = cc2520_write_ram(priv, CC2520RAM_PANID,
668 				       sizeof(panid), (u8 *)&panid);
669 	}
670 
671 	if (changed & IEEE802154_AFILT_IEEEADDR_CHANGED) {
672 		dev_vdbg(&priv->spi->dev,
673 			 "%s called for IEEE addr\n", __func__);
674 		ret = cc2520_write_ram(priv, CC2520RAM_IEEEADDR,
675 				       sizeof(filt->ieee_addr),
676 				       (u8 *)&filt->ieee_addr);
677 	}
678 
679 	if (changed & IEEE802154_AFILT_SADDR_CHANGED) {
680 		u16 addr = le16_to_cpu(filt->short_addr);
681 
682 		dev_vdbg(&priv->spi->dev, "%s called for saddr\n", __func__);
683 		ret = cc2520_write_ram(priv, CC2520RAM_SHORTADDR,
684 				       sizeof(addr), (u8 *)&addr);
685 	}
686 
687 	if (changed & IEEE802154_AFILT_PANC_CHANGED) {
688 		u8 frmfilt0;
689 
690 		dev_vdbg(&priv->spi->dev,
691 			 "%s called for panc change\n", __func__);
692 
693 		cc2520_read_register(priv, CC2520_FRMFILT0, &frmfilt0);
694 
695 		if (filt->pan_coord)
696 			frmfilt0 |= FRMFILT0_PAN_COORDINATOR;
697 		else
698 			frmfilt0 &= ~FRMFILT0_PAN_COORDINATOR;
699 
700 		ret = cc2520_write_register(priv, CC2520_FRMFILT0, frmfilt0);
701 	}
702 
703 	return ret;
704 }
705 
706 static inline int cc2520_set_tx_power(struct cc2520_private *priv, s32 mbm)
707 {
708 	u8 power;
709 
710 	switch (mbm) {
711 	case 500:
712 		power = 0xF7;
713 		break;
714 	case 300:
715 		power = 0xF2;
716 		break;
717 	case 200:
718 		power = 0xAB;
719 		break;
720 	case 100:
721 		power = 0x13;
722 		break;
723 	case 0:
724 		power = 0x32;
725 		break;
726 	case -200:
727 		power = 0x81;
728 		break;
729 	case -400:
730 		power = 0x88;
731 		break;
732 	case -700:
733 		power = 0x2C;
734 		break;
735 	case -1800:
736 		power = 0x03;
737 		break;
738 	default:
739 		return -EINVAL;
740 	}
741 
742 	return cc2520_write_register(priv, CC2520_TXPOWER, power);
743 }
744 
745 static inline int cc2520_cc2591_set_tx_power(struct cc2520_private *priv,
746 					     s32 mbm)
747 {
748 	u8 power;
749 
750 	switch (mbm) {
751 	case 1700:
752 		power = 0xF9;
753 		break;
754 	case 1600:
755 		power = 0xF0;
756 		break;
757 	case 1400:
758 		power = 0xA0;
759 		break;
760 	case 1100:
761 		power = 0x2C;
762 		break;
763 	case -100:
764 		power = 0x03;
765 		break;
766 	case -800:
767 		power = 0x01;
768 		break;
769 	default:
770 		return -EINVAL;
771 	}
772 
773 	return cc2520_write_register(priv, CC2520_TXPOWER, power);
774 }
775 
776 #define CC2520_MAX_TX_POWERS 0x8
777 static const s32 cc2520_powers[CC2520_MAX_TX_POWERS + 1] = {
778 	500, 300, 200, 100, 0, -200, -400, -700, -1800,
779 };
780 
781 #define CC2520_CC2591_MAX_TX_POWERS 0x5
782 static const s32 cc2520_cc2591_powers[CC2520_CC2591_MAX_TX_POWERS + 1] = {
783 	1700, 1600, 1400, 1100, -100, -800,
784 };
785 
786 static int
787 cc2520_set_txpower(struct ieee802154_hw *hw, s32 mbm)
788 {
789 	struct cc2520_private *priv = hw->priv;
790 
791 	if (!priv->amplified)
792 		return cc2520_set_tx_power(priv, mbm);
793 
794 	return cc2520_cc2591_set_tx_power(priv, mbm);
795 }
796 
797 static int
798 cc2520_set_promiscuous_mode(struct ieee802154_hw *hw, bool on)
799 {
800 	struct cc2520_private *priv = hw->priv;
801 	u8 frmfilt0;
802 
803 	dev_dbg(&priv->spi->dev, "%s : mode %d\n", __func__, on);
804 
805 	priv->promiscuous = on;
806 
807 	cc2520_read_register(priv, CC2520_FRMFILT0, &frmfilt0);
808 
809 	if (on) {
810 		/* Disable automatic ACK, automatic CRC, and frame filtering. */
811 		cc2520_write_register(priv, CC2520_FRMCTRL0, 0);
812 		frmfilt0 &= ~FRMFILT0_FRAME_FILTER_EN;
813 	} else {
814 		cc2520_write_register(priv, CC2520_FRMCTRL0, FRMCTRL0_AUTOACK |
815 							     FRMCTRL0_AUTOCRC);
816 		frmfilt0 |= FRMFILT0_FRAME_FILTER_EN;
817 	}
818 	return cc2520_write_register(priv, CC2520_FRMFILT0, frmfilt0);
819 }
820 
821 static const struct ieee802154_ops cc2520_ops = {
822 	.owner = THIS_MODULE,
823 	.start = cc2520_start,
824 	.stop = cc2520_stop,
825 	.xmit_sync = cc2520_tx,
826 	.ed = cc2520_ed,
827 	.set_channel = cc2520_set_channel,
828 	.set_hw_addr_filt = cc2520_filter,
829 	.set_txpower = cc2520_set_txpower,
830 	.set_promiscuous_mode = cc2520_set_promiscuous_mode,
831 };
832 
833 static int cc2520_register(struct cc2520_private *priv)
834 {
835 	int ret = -ENOMEM;
836 
837 	priv->hw = ieee802154_alloc_hw(sizeof(*priv), &cc2520_ops);
838 	if (!priv->hw)
839 		goto err_ret;
840 
841 	priv->hw->priv = priv;
842 	priv->hw->parent = &priv->spi->dev;
843 	priv->hw->extra_tx_headroom = 0;
844 	ieee802154_random_extended_addr(&priv->hw->phy->perm_extended_addr);
845 
846 	/* We do support only 2.4 Ghz */
847 	priv->hw->phy->supported.channels[0] = 0x7FFF800;
848 	priv->hw->flags = IEEE802154_HW_TX_OMIT_CKSUM | IEEE802154_HW_AFILT |
849 			  IEEE802154_HW_PROMISCUOUS;
850 
851 	priv->hw->phy->flags = WPAN_PHY_FLAG_TXPOWER;
852 
853 	if (!priv->amplified) {
854 		priv->hw->phy->supported.tx_powers = cc2520_powers;
855 		priv->hw->phy->supported.tx_powers_size = ARRAY_SIZE(cc2520_powers);
856 		priv->hw->phy->transmit_power = priv->hw->phy->supported.tx_powers[4];
857 	} else {
858 		priv->hw->phy->supported.tx_powers = cc2520_cc2591_powers;
859 		priv->hw->phy->supported.tx_powers_size = ARRAY_SIZE(cc2520_cc2591_powers);
860 		priv->hw->phy->transmit_power = priv->hw->phy->supported.tx_powers[0];
861 	}
862 
863 	priv->hw->phy->current_channel = 11;
864 
865 	dev_vdbg(&priv->spi->dev, "registered cc2520\n");
866 	ret = ieee802154_register_hw(priv->hw);
867 	if (ret)
868 		goto err_free_device;
869 
870 	return 0;
871 
872 err_free_device:
873 	ieee802154_free_hw(priv->hw);
874 err_ret:
875 	return ret;
876 }
877 
878 static void cc2520_fifop_irqwork(struct work_struct *work)
879 {
880 	struct cc2520_private *priv
881 		= container_of(work, struct cc2520_private, fifop_irqwork);
882 
883 	dev_dbg(&priv->spi->dev, "fifop interrupt received\n");
884 
885 	if (gpio_get_value(priv->fifo_pin))
886 		cc2520_rx(priv);
887 	else
888 		dev_dbg(&priv->spi->dev, "rxfifo overflow\n");
889 
890 	cc2520_cmd_strobe(priv, CC2520_CMD_SFLUSHRX);
891 	cc2520_cmd_strobe(priv, CC2520_CMD_SFLUSHRX);
892 }
893 
894 static irqreturn_t cc2520_fifop_isr(int irq, void *data)
895 {
896 	struct cc2520_private *priv = data;
897 
898 	schedule_work(&priv->fifop_irqwork);
899 
900 	return IRQ_HANDLED;
901 }
902 
903 static irqreturn_t cc2520_sfd_isr(int irq, void *data)
904 {
905 	struct cc2520_private *priv = data;
906 	unsigned long flags;
907 
908 	spin_lock_irqsave(&priv->lock, flags);
909 	if (priv->is_tx) {
910 		priv->is_tx = 0;
911 		spin_unlock_irqrestore(&priv->lock, flags);
912 		dev_dbg(&priv->spi->dev, "SFD for TX\n");
913 		complete(&priv->tx_complete);
914 	} else {
915 		spin_unlock_irqrestore(&priv->lock, flags);
916 		dev_dbg(&priv->spi->dev, "SFD for RX\n");
917 	}
918 
919 	return IRQ_HANDLED;
920 }
921 
922 static int cc2520_get_platform_data(struct spi_device *spi,
923 				    struct cc2520_platform_data *pdata)
924 {
925 	struct device_node *np = spi->dev.of_node;
926 	struct cc2520_private *priv = spi_get_drvdata(spi);
927 
928 	if (!np) {
929 		struct cc2520_platform_data *spi_pdata = spi->dev.platform_data;
930 
931 		if (!spi_pdata)
932 			return -ENOENT;
933 		*pdata = *spi_pdata;
934 		priv->fifo_pin = pdata->fifo;
935 		return 0;
936 	}
937 
938 	pdata->fifo = of_get_named_gpio(np, "fifo-gpio", 0);
939 	priv->fifo_pin = pdata->fifo;
940 
941 	pdata->fifop = of_get_named_gpio(np, "fifop-gpio", 0);
942 
943 	pdata->sfd = of_get_named_gpio(np, "sfd-gpio", 0);
944 	pdata->cca = of_get_named_gpio(np, "cca-gpio", 0);
945 	pdata->vreg = of_get_named_gpio(np, "vreg-gpio", 0);
946 	pdata->reset = of_get_named_gpio(np, "reset-gpio", 0);
947 
948 	/* CC2591 front end for CC2520 */
949 	if (of_property_read_bool(np, "amplified"))
950 		priv->amplified = true;
951 
952 	return 0;
953 }
954 
955 static int cc2520_hw_init(struct cc2520_private *priv)
956 {
957 	u8 status = 0, state = 0xff;
958 	int ret;
959 	int timeout = 100;
960 	struct cc2520_platform_data pdata;
961 
962 	ret = cc2520_get_platform_data(priv->spi, &pdata);
963 	if (ret)
964 		goto err_ret;
965 
966 	ret = cc2520_read_register(priv, CC2520_FSMSTAT1, &state);
967 	if (ret)
968 		goto err_ret;
969 
970 	if (state != STATE_IDLE)
971 		return -EINVAL;
972 
973 	do {
974 		ret = cc2520_get_status(priv, &status);
975 		if (ret)
976 			goto err_ret;
977 
978 		if (timeout-- <= 0) {
979 			dev_err(&priv->spi->dev, "oscillator start failed!\n");
980 			return ret;
981 		}
982 		udelay(1);
983 	} while (!(status & CC2520_STATUS_XOSC32M_STABLE));
984 
985 	dev_vdbg(&priv->spi->dev, "oscillator brought up\n");
986 
987 	/* If the CC2520 is connected to a CC2591 amplifier, we must both
988 	 * configure GPIOs on the CC2520 to correctly configure the CC2591
989 	 * and change a couple settings of the CC2520 to work with the
990 	 * amplifier. See section 8 page 17 of TI application note AN065.
991 	 * http://www.ti.com/lit/an/swra229a/swra229a.pdf
992 	 */
993 	if (priv->amplified) {
994 		ret = cc2520_write_register(priv, CC2520_AGCCTRL1, 0x16);
995 		if (ret)
996 			goto err_ret;
997 
998 		ret = cc2520_write_register(priv, CC2520_GPIOCTRL0, 0x46);
999 		if (ret)
1000 			goto err_ret;
1001 
1002 		ret = cc2520_write_register(priv, CC2520_GPIOCTRL5, 0x47);
1003 		if (ret)
1004 			goto err_ret;
1005 
1006 		ret = cc2520_write_register(priv, CC2520_GPIOPOLARITY, 0x1e);
1007 		if (ret)
1008 			goto err_ret;
1009 
1010 		ret = cc2520_write_register(priv, CC2520_TXCTRL, 0xc1);
1011 		if (ret)
1012 			goto err_ret;
1013 	} else {
1014 		ret = cc2520_write_register(priv, CC2520_AGCCTRL1, 0x11);
1015 		if (ret)
1016 			goto err_ret;
1017 	}
1018 
1019 	/* Registers default value: section 28.1 in Datasheet */
1020 
1021 	/* Set the CCA threshold to -50 dBm. This seems to have been copied
1022 	 * from the TinyOS CC2520 driver and is much higher than the -84 dBm
1023 	 * threshold suggested in the datasheet.
1024 	 */
1025 	ret = cc2520_write_register(priv, CC2520_CCACTRL0, 0x1A);
1026 	if (ret)
1027 		goto err_ret;
1028 
1029 	ret = cc2520_write_register(priv, CC2520_MDMCTRL0, 0x85);
1030 	if (ret)
1031 		goto err_ret;
1032 
1033 	ret = cc2520_write_register(priv, CC2520_MDMCTRL1, 0x14);
1034 	if (ret)
1035 		goto err_ret;
1036 
1037 	ret = cc2520_write_register(priv, CC2520_RXCTRL, 0x3f);
1038 	if (ret)
1039 		goto err_ret;
1040 
1041 	ret = cc2520_write_register(priv, CC2520_FSCTRL, 0x5a);
1042 	if (ret)
1043 		goto err_ret;
1044 
1045 	ret = cc2520_write_register(priv, CC2520_FSCAL1, 0x2b);
1046 	if (ret)
1047 		goto err_ret;
1048 
1049 	ret = cc2520_write_register(priv, CC2520_ADCTEST0, 0x10);
1050 	if (ret)
1051 		goto err_ret;
1052 
1053 	ret = cc2520_write_register(priv, CC2520_ADCTEST1, 0x0e);
1054 	if (ret)
1055 		goto err_ret;
1056 
1057 	ret = cc2520_write_register(priv, CC2520_ADCTEST2, 0x03);
1058 	if (ret)
1059 		goto err_ret;
1060 
1061 	/* Configure registers correctly for this driver. */
1062 	ret = cc2520_write_register(priv, CC2520_FRMCTRL1,
1063 				    FRMCTRL1_SET_RXENMASK_ON_TX |
1064 				    FRMCTRL1_IGNORE_TX_UNDERF);
1065 	if (ret)
1066 		goto err_ret;
1067 
1068 	ret = cc2520_write_register(priv, CC2520_FIFOPCTRL, 127);
1069 	if (ret)
1070 		goto err_ret;
1071 
1072 	return 0;
1073 
1074 err_ret:
1075 	return ret;
1076 }
1077 
1078 static int cc2520_probe(struct spi_device *spi)
1079 {
1080 	struct cc2520_private *priv;
1081 	struct cc2520_platform_data pdata;
1082 	int ret;
1083 
1084 	priv = devm_kzalloc(&spi->dev, sizeof(*priv), GFP_KERNEL);
1085 	if (!priv)
1086 		return -ENOMEM;
1087 
1088 	spi_set_drvdata(spi, priv);
1089 
1090 	ret = cc2520_get_platform_data(spi, &pdata);
1091 	if (ret < 0) {
1092 		dev_err(&spi->dev, "no platform data\n");
1093 		return -EINVAL;
1094 	}
1095 
1096 	priv->spi = spi;
1097 
1098 	priv->buf = devm_kzalloc(&spi->dev,
1099 				 SPI_COMMAND_BUFFER, GFP_KERNEL);
1100 	if (!priv->buf)
1101 		return -ENOMEM;
1102 
1103 	mutex_init(&priv->buffer_mutex);
1104 	INIT_WORK(&priv->fifop_irqwork, cc2520_fifop_irqwork);
1105 	spin_lock_init(&priv->lock);
1106 	init_completion(&priv->tx_complete);
1107 
1108 	/* Assumption that CC2591 is not connected */
1109 	priv->amplified = false;
1110 
1111 	/* Request all the gpio's */
1112 	if (!gpio_is_valid(pdata.fifo)) {
1113 		dev_err(&spi->dev, "fifo gpio is not valid\n");
1114 		ret = -EINVAL;
1115 		goto err_hw_init;
1116 	}
1117 
1118 	ret = devm_gpio_request_one(&spi->dev, pdata.fifo,
1119 				    GPIOF_IN, "fifo");
1120 	if (ret)
1121 		goto err_hw_init;
1122 
1123 	if (!gpio_is_valid(pdata.cca)) {
1124 		dev_err(&spi->dev, "cca gpio is not valid\n");
1125 		ret = -EINVAL;
1126 		goto err_hw_init;
1127 	}
1128 
1129 	ret = devm_gpio_request_one(&spi->dev, pdata.cca,
1130 				    GPIOF_IN, "cca");
1131 	if (ret)
1132 		goto err_hw_init;
1133 
1134 	if (!gpio_is_valid(pdata.fifop)) {
1135 		dev_err(&spi->dev, "fifop gpio is not valid\n");
1136 		ret = -EINVAL;
1137 		goto err_hw_init;
1138 	}
1139 
1140 	ret = devm_gpio_request_one(&spi->dev, pdata.fifop,
1141 				    GPIOF_IN, "fifop");
1142 	if (ret)
1143 		goto err_hw_init;
1144 
1145 	if (!gpio_is_valid(pdata.sfd)) {
1146 		dev_err(&spi->dev, "sfd gpio is not valid\n");
1147 		ret = -EINVAL;
1148 		goto err_hw_init;
1149 	}
1150 
1151 	ret = devm_gpio_request_one(&spi->dev, pdata.sfd,
1152 				    GPIOF_IN, "sfd");
1153 	if (ret)
1154 		goto err_hw_init;
1155 
1156 	if (!gpio_is_valid(pdata.reset)) {
1157 		dev_err(&spi->dev, "reset gpio is not valid\n");
1158 		ret = -EINVAL;
1159 		goto err_hw_init;
1160 	}
1161 
1162 	ret = devm_gpio_request_one(&spi->dev, pdata.reset,
1163 				    GPIOF_OUT_INIT_LOW, "reset");
1164 	if (ret)
1165 		goto err_hw_init;
1166 
1167 	if (!gpio_is_valid(pdata.vreg)) {
1168 		dev_err(&spi->dev, "vreg gpio is not valid\n");
1169 		ret = -EINVAL;
1170 		goto err_hw_init;
1171 	}
1172 
1173 	ret = devm_gpio_request_one(&spi->dev, pdata.vreg,
1174 				    GPIOF_OUT_INIT_LOW, "vreg");
1175 	if (ret)
1176 		goto err_hw_init;
1177 
1178 	gpio_set_value(pdata.vreg, HIGH);
1179 	usleep_range(100, 150);
1180 
1181 	gpio_set_value(pdata.reset, HIGH);
1182 	usleep_range(200, 250);
1183 
1184 	ret = cc2520_hw_init(priv);
1185 	if (ret)
1186 		goto err_hw_init;
1187 
1188 	/* Set up fifop interrupt */
1189 	ret = devm_request_irq(&spi->dev,
1190 			       gpio_to_irq(pdata.fifop),
1191 			       cc2520_fifop_isr,
1192 			       IRQF_TRIGGER_RISING,
1193 			       dev_name(&spi->dev),
1194 			       priv);
1195 	if (ret) {
1196 		dev_err(&spi->dev, "could not get fifop irq\n");
1197 		goto err_hw_init;
1198 	}
1199 
1200 	/* Set up sfd interrupt */
1201 	ret = devm_request_irq(&spi->dev,
1202 			       gpio_to_irq(pdata.sfd),
1203 			       cc2520_sfd_isr,
1204 			       IRQF_TRIGGER_FALLING,
1205 			       dev_name(&spi->dev),
1206 			       priv);
1207 	if (ret) {
1208 		dev_err(&spi->dev, "could not get sfd irq\n");
1209 		goto err_hw_init;
1210 	}
1211 
1212 	ret = cc2520_register(priv);
1213 	if (ret)
1214 		goto err_hw_init;
1215 
1216 	return 0;
1217 
1218 err_hw_init:
1219 	mutex_destroy(&priv->buffer_mutex);
1220 	flush_work(&priv->fifop_irqwork);
1221 	return ret;
1222 }
1223 
1224 static int cc2520_remove(struct spi_device *spi)
1225 {
1226 	struct cc2520_private *priv = spi_get_drvdata(spi);
1227 
1228 	mutex_destroy(&priv->buffer_mutex);
1229 	flush_work(&priv->fifop_irqwork);
1230 
1231 	ieee802154_unregister_hw(priv->hw);
1232 	ieee802154_free_hw(priv->hw);
1233 
1234 	return 0;
1235 }
1236 
1237 static const struct spi_device_id cc2520_ids[] = {
1238 	{"cc2520", },
1239 	{},
1240 };
1241 MODULE_DEVICE_TABLE(spi, cc2520_ids);
1242 
1243 static const struct of_device_id cc2520_of_ids[] = {
1244 	{.compatible = "ti,cc2520", },
1245 	{},
1246 };
1247 MODULE_DEVICE_TABLE(of, cc2520_of_ids);
1248 
1249 /* SPI driver structure */
1250 static struct spi_driver cc2520_driver = {
1251 	.driver = {
1252 		.name = "cc2520",
1253 		.of_match_table = of_match_ptr(cc2520_of_ids),
1254 	},
1255 	.id_table = cc2520_ids,
1256 	.probe = cc2520_probe,
1257 	.remove = cc2520_remove,
1258 };
1259 module_spi_driver(cc2520_driver);
1260 
1261 MODULE_AUTHOR("Varka Bhadram <varkab@cdac.in>");
1262 MODULE_DESCRIPTION("CC2520 Transceiver Driver");
1263 MODULE_LICENSE("GPL v2");
1264