1 /*
2 * MCP23S08 SPI/GPIO gpio expander driver
3 */
4
5 #include <linux/kernel.h>
6 #include <linux/device.h>
7 #include <linux/mutex.h>
8 #include <linux/module.h>
9 #include <linux/gpio.h>
10 #include <linux/i2c.h>
11 #include <linux/spi/spi.h>
12 #include <linux/spi/mcp23s08.h>
13 #include <linux/slab.h>
14 #include <asm/byteorder.h>
15
16 /**
17 * MCP types supported by driver
18 */
19 #define MCP_TYPE_S08 0
20 #define MCP_TYPE_S17 1
21 #define MCP_TYPE_008 2
22 #define MCP_TYPE_017 3
23
24 /* Registers are all 8 bits wide.
25 *
26 * The mcp23s17 has twice as many bits, and can be configured to work
27 * with either 16 bit registers or with two adjacent 8 bit banks.
28 */
29 #define MCP_IODIR 0x00 /* init/reset: all ones */
30 #define MCP_IPOL 0x01
31 #define MCP_GPINTEN 0x02
32 #define MCP_DEFVAL 0x03
33 #define MCP_INTCON 0x04
34 #define MCP_IOCON 0x05
35 # define IOCON_SEQOP (1 << 5)
36 # define IOCON_HAEN (1 << 3)
37 # define IOCON_ODR (1 << 2)
38 # define IOCON_INTPOL (1 << 1)
39 #define MCP_GPPU 0x06
40 #define MCP_INTF 0x07
41 #define MCP_INTCAP 0x08
42 #define MCP_GPIO 0x09
43 #define MCP_OLAT 0x0a
44
45 struct mcp23s08;
46
47 struct mcp23s08_ops {
48 int (*read)(struct mcp23s08 *mcp, unsigned reg);
49 int (*write)(struct mcp23s08 *mcp, unsigned reg, unsigned val);
50 int (*read_regs)(struct mcp23s08 *mcp, unsigned reg,
51 u16 *vals, unsigned n);
52 };
53
54 struct mcp23s08 {
55 u8 addr;
56
57 u16 cache[11];
58 /* lock protects the cached values */
59 struct mutex lock;
60
61 struct gpio_chip chip;
62
63 const struct mcp23s08_ops *ops;
64 void *data; /* ops specific data */
65 };
66
67 /* A given spi_device can represent up to eight mcp23sxx chips
68 * sharing the same chipselect but using different addresses
69 * (e.g. chips #0 and #3 might be populated, but not #1 or $2).
70 * Driver data holds all the per-chip data.
71 */
72 struct mcp23s08_driver_data {
73 unsigned ngpio;
74 struct mcp23s08 *mcp[8];
75 struct mcp23s08 chip[];
76 };
77
78 /*----------------------------------------------------------------------*/
79
80 #ifdef CONFIG_I2C
81
mcp23008_read(struct mcp23s08 * mcp,unsigned reg)82 static int mcp23008_read(struct mcp23s08 *mcp, unsigned reg)
83 {
84 return i2c_smbus_read_byte_data(mcp->data, reg);
85 }
86
mcp23008_write(struct mcp23s08 * mcp,unsigned reg,unsigned val)87 static int mcp23008_write(struct mcp23s08 *mcp, unsigned reg, unsigned val)
88 {
89 return i2c_smbus_write_byte_data(mcp->data, reg, val);
90 }
91
92 static int
mcp23008_read_regs(struct mcp23s08 * mcp,unsigned reg,u16 * vals,unsigned n)93 mcp23008_read_regs(struct mcp23s08 *mcp, unsigned reg, u16 *vals, unsigned n)
94 {
95 while (n--) {
96 int ret = mcp23008_read(mcp, reg++);
97 if (ret < 0)
98 return ret;
99 *vals++ = ret;
100 }
101
102 return 0;
103 }
104
mcp23017_read(struct mcp23s08 * mcp,unsigned reg)105 static int mcp23017_read(struct mcp23s08 *mcp, unsigned reg)
106 {
107 return i2c_smbus_read_word_data(mcp->data, reg << 1);
108 }
109
mcp23017_write(struct mcp23s08 * mcp,unsigned reg,unsigned val)110 static int mcp23017_write(struct mcp23s08 *mcp, unsigned reg, unsigned val)
111 {
112 return i2c_smbus_write_word_data(mcp->data, reg << 1, val);
113 }
114
115 static int
mcp23017_read_regs(struct mcp23s08 * mcp,unsigned reg,u16 * vals,unsigned n)116 mcp23017_read_regs(struct mcp23s08 *mcp, unsigned reg, u16 *vals, unsigned n)
117 {
118 while (n--) {
119 int ret = mcp23017_read(mcp, reg++);
120 if (ret < 0)
121 return ret;
122 *vals++ = ret;
123 }
124
125 return 0;
126 }
127
128 static const struct mcp23s08_ops mcp23008_ops = {
129 .read = mcp23008_read,
130 .write = mcp23008_write,
131 .read_regs = mcp23008_read_regs,
132 };
133
134 static const struct mcp23s08_ops mcp23017_ops = {
135 .read = mcp23017_read,
136 .write = mcp23017_write,
137 .read_regs = mcp23017_read_regs,
138 };
139
140 #endif /* CONFIG_I2C */
141
142 /*----------------------------------------------------------------------*/
143
144 #ifdef CONFIG_SPI_MASTER
145
mcp23s08_read(struct mcp23s08 * mcp,unsigned reg)146 static int mcp23s08_read(struct mcp23s08 *mcp, unsigned reg)
147 {
148 u8 tx[2], rx[1];
149 int status;
150
151 tx[0] = mcp->addr | 0x01;
152 tx[1] = reg;
153 status = spi_write_then_read(mcp->data, tx, sizeof tx, rx, sizeof rx);
154 return (status < 0) ? status : rx[0];
155 }
156
mcp23s08_write(struct mcp23s08 * mcp,unsigned reg,unsigned val)157 static int mcp23s08_write(struct mcp23s08 *mcp, unsigned reg, unsigned val)
158 {
159 u8 tx[3];
160
161 tx[0] = mcp->addr;
162 tx[1] = reg;
163 tx[2] = val;
164 return spi_write_then_read(mcp->data, tx, sizeof tx, NULL, 0);
165 }
166
167 static int
mcp23s08_read_regs(struct mcp23s08 * mcp,unsigned reg,u16 * vals,unsigned n)168 mcp23s08_read_regs(struct mcp23s08 *mcp, unsigned reg, u16 *vals, unsigned n)
169 {
170 u8 tx[2], *tmp;
171 int status;
172
173 if ((n + reg) > sizeof mcp->cache)
174 return -EINVAL;
175 tx[0] = mcp->addr | 0x01;
176 tx[1] = reg;
177
178 tmp = (u8 *)vals;
179 status = spi_write_then_read(mcp->data, tx, sizeof tx, tmp, n);
180 if (status >= 0) {
181 while (n--)
182 vals[n] = tmp[n]; /* expand to 16bit */
183 }
184 return status;
185 }
186
mcp23s17_read(struct mcp23s08 * mcp,unsigned reg)187 static int mcp23s17_read(struct mcp23s08 *mcp, unsigned reg)
188 {
189 u8 tx[2], rx[2];
190 int status;
191
192 tx[0] = mcp->addr | 0x01;
193 tx[1] = reg << 1;
194 status = spi_write_then_read(mcp->data, tx, sizeof tx, rx, sizeof rx);
195 return (status < 0) ? status : (rx[0] | (rx[1] << 8));
196 }
197
mcp23s17_write(struct mcp23s08 * mcp,unsigned reg,unsigned val)198 static int mcp23s17_write(struct mcp23s08 *mcp, unsigned reg, unsigned val)
199 {
200 u8 tx[4];
201
202 tx[0] = mcp->addr;
203 tx[1] = reg << 1;
204 tx[2] = val;
205 tx[3] = val >> 8;
206 return spi_write_then_read(mcp->data, tx, sizeof tx, NULL, 0);
207 }
208
209 static int
mcp23s17_read_regs(struct mcp23s08 * mcp,unsigned reg,u16 * vals,unsigned n)210 mcp23s17_read_regs(struct mcp23s08 *mcp, unsigned reg, u16 *vals, unsigned n)
211 {
212 u8 tx[2];
213 int status;
214
215 if ((n + reg) > sizeof mcp->cache)
216 return -EINVAL;
217 tx[0] = mcp->addr | 0x01;
218 tx[1] = reg << 1;
219
220 status = spi_write_then_read(mcp->data, tx, sizeof tx,
221 (u8 *)vals, n * 2);
222 if (status >= 0) {
223 while (n--)
224 vals[n] = __le16_to_cpu((__le16)vals[n]);
225 }
226
227 return status;
228 }
229
230 static const struct mcp23s08_ops mcp23s08_ops = {
231 .read = mcp23s08_read,
232 .write = mcp23s08_write,
233 .read_regs = mcp23s08_read_regs,
234 };
235
236 static const struct mcp23s08_ops mcp23s17_ops = {
237 .read = mcp23s17_read,
238 .write = mcp23s17_write,
239 .read_regs = mcp23s17_read_regs,
240 };
241
242 #endif /* CONFIG_SPI_MASTER */
243
244 /*----------------------------------------------------------------------*/
245
mcp23s08_direction_input(struct gpio_chip * chip,unsigned offset)246 static int mcp23s08_direction_input(struct gpio_chip *chip, unsigned offset)
247 {
248 struct mcp23s08 *mcp = container_of(chip, struct mcp23s08, chip);
249 int status;
250
251 mutex_lock(&mcp->lock);
252 mcp->cache[MCP_IODIR] |= (1 << offset);
253 status = mcp->ops->write(mcp, MCP_IODIR, mcp->cache[MCP_IODIR]);
254 mutex_unlock(&mcp->lock);
255 return status;
256 }
257
mcp23s08_get(struct gpio_chip * chip,unsigned offset)258 static int mcp23s08_get(struct gpio_chip *chip, unsigned offset)
259 {
260 struct mcp23s08 *mcp = container_of(chip, struct mcp23s08, chip);
261 int status;
262
263 mutex_lock(&mcp->lock);
264
265 /* REVISIT reading this clears any IRQ ... */
266 status = mcp->ops->read(mcp, MCP_GPIO);
267 if (status < 0)
268 status = 0;
269 else {
270 mcp->cache[MCP_GPIO] = status;
271 status = !!(status & (1 << offset));
272 }
273 mutex_unlock(&mcp->lock);
274 return status;
275 }
276
__mcp23s08_set(struct mcp23s08 * mcp,unsigned mask,int value)277 static int __mcp23s08_set(struct mcp23s08 *mcp, unsigned mask, int value)
278 {
279 unsigned olat = mcp->cache[MCP_OLAT];
280
281 if (value)
282 olat |= mask;
283 else
284 olat &= ~mask;
285 mcp->cache[MCP_OLAT] = olat;
286 return mcp->ops->write(mcp, MCP_OLAT, olat);
287 }
288
mcp23s08_set(struct gpio_chip * chip,unsigned offset,int value)289 static void mcp23s08_set(struct gpio_chip *chip, unsigned offset, int value)
290 {
291 struct mcp23s08 *mcp = container_of(chip, struct mcp23s08, chip);
292 unsigned mask = 1 << offset;
293
294 mutex_lock(&mcp->lock);
295 __mcp23s08_set(mcp, mask, value);
296 mutex_unlock(&mcp->lock);
297 }
298
299 static int
mcp23s08_direction_output(struct gpio_chip * chip,unsigned offset,int value)300 mcp23s08_direction_output(struct gpio_chip *chip, unsigned offset, int value)
301 {
302 struct mcp23s08 *mcp = container_of(chip, struct mcp23s08, chip);
303 unsigned mask = 1 << offset;
304 int status;
305
306 mutex_lock(&mcp->lock);
307 status = __mcp23s08_set(mcp, mask, value);
308 if (status == 0) {
309 mcp->cache[MCP_IODIR] &= ~mask;
310 status = mcp->ops->write(mcp, MCP_IODIR, mcp->cache[MCP_IODIR]);
311 }
312 mutex_unlock(&mcp->lock);
313 return status;
314 }
315
316 /*----------------------------------------------------------------------*/
317
318 #ifdef CONFIG_DEBUG_FS
319
320 #include <linux/seq_file.h>
321
322 /*
323 * This shows more info than the generic gpio dump code:
324 * pullups, deglitching, open drain drive.
325 */
mcp23s08_dbg_show(struct seq_file * s,struct gpio_chip * chip)326 static void mcp23s08_dbg_show(struct seq_file *s, struct gpio_chip *chip)
327 {
328 struct mcp23s08 *mcp;
329 char bank;
330 int t;
331 unsigned mask;
332
333 mcp = container_of(chip, struct mcp23s08, chip);
334
335 /* NOTE: we only handle one bank for now ... */
336 bank = '0' + ((mcp->addr >> 1) & 0x7);
337
338 mutex_lock(&mcp->lock);
339 t = mcp->ops->read_regs(mcp, 0, mcp->cache, ARRAY_SIZE(mcp->cache));
340 if (t < 0) {
341 seq_printf(s, " I/O ERROR %d\n", t);
342 goto done;
343 }
344
345 for (t = 0, mask = 1; t < chip->ngpio; t++, mask <<= 1) {
346 const char *label;
347
348 label = gpiochip_is_requested(chip, t);
349 if (!label)
350 continue;
351
352 seq_printf(s, " gpio-%-3d P%c.%d (%-12s) %s %s %s",
353 chip->base + t, bank, t, label,
354 (mcp->cache[MCP_IODIR] & mask) ? "in " : "out",
355 (mcp->cache[MCP_GPIO] & mask) ? "hi" : "lo",
356 (mcp->cache[MCP_GPPU] & mask) ? " " : "up");
357 /* NOTE: ignoring the irq-related registers */
358 seq_printf(s, "\n");
359 }
360 done:
361 mutex_unlock(&mcp->lock);
362 }
363
364 #else
365 #define mcp23s08_dbg_show NULL
366 #endif
367
368 /*----------------------------------------------------------------------*/
369
mcp23s08_probe_one(struct mcp23s08 * mcp,struct device * dev,void * data,unsigned addr,unsigned type,unsigned base,unsigned pullups)370 static int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev,
371 void *data, unsigned addr,
372 unsigned type, unsigned base, unsigned pullups)
373 {
374 int status;
375
376 mutex_init(&mcp->lock);
377
378 mcp->data = data;
379 mcp->addr = addr;
380
381 mcp->chip.direction_input = mcp23s08_direction_input;
382 mcp->chip.get = mcp23s08_get;
383 mcp->chip.direction_output = mcp23s08_direction_output;
384 mcp->chip.set = mcp23s08_set;
385 mcp->chip.dbg_show = mcp23s08_dbg_show;
386
387 switch (type) {
388 #ifdef CONFIG_SPI_MASTER
389 case MCP_TYPE_S08:
390 mcp->ops = &mcp23s08_ops;
391 mcp->chip.ngpio = 8;
392 mcp->chip.label = "mcp23s08";
393 break;
394
395 case MCP_TYPE_S17:
396 mcp->ops = &mcp23s17_ops;
397 mcp->chip.ngpio = 16;
398 mcp->chip.label = "mcp23s17";
399 break;
400 #endif /* CONFIG_SPI_MASTER */
401
402 #ifdef CONFIG_I2C
403 case MCP_TYPE_008:
404 mcp->ops = &mcp23008_ops;
405 mcp->chip.ngpio = 8;
406 mcp->chip.label = "mcp23008";
407 break;
408
409 case MCP_TYPE_017:
410 mcp->ops = &mcp23017_ops;
411 mcp->chip.ngpio = 16;
412 mcp->chip.label = "mcp23017";
413 break;
414 #endif /* CONFIG_I2C */
415
416 default:
417 dev_err(dev, "invalid device type (%d)\n", type);
418 return -EINVAL;
419 }
420
421 mcp->chip.base = base;
422 mcp->chip.can_sleep = 1;
423 mcp->chip.dev = dev;
424 mcp->chip.owner = THIS_MODULE;
425
426 /* verify MCP_IOCON.SEQOP = 0, so sequential reads work,
427 * and MCP_IOCON.HAEN = 1, so we work with all chips.
428 */
429 status = mcp->ops->read(mcp, MCP_IOCON);
430 if (status < 0)
431 goto fail;
432 if ((status & IOCON_SEQOP) || !(status & IOCON_HAEN)) {
433 /* mcp23s17 has IOCON twice, make sure they are in sync */
434 status &= ~(IOCON_SEQOP | (IOCON_SEQOP << 8));
435 status |= IOCON_HAEN | (IOCON_HAEN << 8);
436 status = mcp->ops->write(mcp, MCP_IOCON, status);
437 if (status < 0)
438 goto fail;
439 }
440
441 /* configure ~100K pullups */
442 status = mcp->ops->write(mcp, MCP_GPPU, pullups);
443 if (status < 0)
444 goto fail;
445
446 status = mcp->ops->read_regs(mcp, 0, mcp->cache, ARRAY_SIZE(mcp->cache));
447 if (status < 0)
448 goto fail;
449
450 /* disable inverter on input */
451 if (mcp->cache[MCP_IPOL] != 0) {
452 mcp->cache[MCP_IPOL] = 0;
453 status = mcp->ops->write(mcp, MCP_IPOL, 0);
454 if (status < 0)
455 goto fail;
456 }
457
458 /* disable irqs */
459 if (mcp->cache[MCP_GPINTEN] != 0) {
460 mcp->cache[MCP_GPINTEN] = 0;
461 status = mcp->ops->write(mcp, MCP_GPINTEN, 0);
462 if (status < 0)
463 goto fail;
464 }
465
466 status = gpiochip_add(&mcp->chip);
467 fail:
468 if (status < 0)
469 dev_dbg(dev, "can't setup chip %d, --> %d\n",
470 addr, status);
471 return status;
472 }
473
474 /*----------------------------------------------------------------------*/
475
476 #ifdef CONFIG_I2C
477
mcp230xx_probe(struct i2c_client * client,const struct i2c_device_id * id)478 static int __devinit mcp230xx_probe(struct i2c_client *client,
479 const struct i2c_device_id *id)
480 {
481 struct mcp23s08_platform_data *pdata;
482 struct mcp23s08 *mcp;
483 int status;
484
485 pdata = client->dev.platform_data;
486 if (!pdata || !gpio_is_valid(pdata->base)) {
487 dev_dbg(&client->dev, "invalid or missing platform data\n");
488 return -EINVAL;
489 }
490
491 mcp = kzalloc(sizeof *mcp, GFP_KERNEL);
492 if (!mcp)
493 return -ENOMEM;
494
495 status = mcp23s08_probe_one(mcp, &client->dev, client, client->addr,
496 id->driver_data, pdata->base,
497 pdata->chip[0].pullups);
498 if (status)
499 goto fail;
500
501 i2c_set_clientdata(client, mcp);
502
503 return 0;
504
505 fail:
506 kfree(mcp);
507
508 return status;
509 }
510
mcp230xx_remove(struct i2c_client * client)511 static int __devexit mcp230xx_remove(struct i2c_client *client)
512 {
513 struct mcp23s08 *mcp = i2c_get_clientdata(client);
514 int status;
515
516 status = gpiochip_remove(&mcp->chip);
517 if (status == 0)
518 kfree(mcp);
519
520 return status;
521 }
522
523 static const struct i2c_device_id mcp230xx_id[] = {
524 { "mcp23008", MCP_TYPE_008 },
525 { "mcp23017", MCP_TYPE_017 },
526 { },
527 };
528 MODULE_DEVICE_TABLE(i2c, mcp230xx_id);
529
530 static struct i2c_driver mcp230xx_driver = {
531 .driver = {
532 .name = "mcp230xx",
533 .owner = THIS_MODULE,
534 },
535 .probe = mcp230xx_probe,
536 .remove = __devexit_p(mcp230xx_remove),
537 .id_table = mcp230xx_id,
538 };
539
mcp23s08_i2c_init(void)540 static int __init mcp23s08_i2c_init(void)
541 {
542 return i2c_add_driver(&mcp230xx_driver);
543 }
544
mcp23s08_i2c_exit(void)545 static void mcp23s08_i2c_exit(void)
546 {
547 i2c_del_driver(&mcp230xx_driver);
548 }
549
550 #else
551
mcp23s08_i2c_init(void)552 static int __init mcp23s08_i2c_init(void) { return 0; }
mcp23s08_i2c_exit(void)553 static void mcp23s08_i2c_exit(void) { }
554
555 #endif /* CONFIG_I2C */
556
557 /*----------------------------------------------------------------------*/
558
559 #ifdef CONFIG_SPI_MASTER
560
mcp23s08_probe(struct spi_device * spi)561 static int mcp23s08_probe(struct spi_device *spi)
562 {
563 struct mcp23s08_platform_data *pdata;
564 unsigned addr;
565 unsigned chips = 0;
566 struct mcp23s08_driver_data *data;
567 int status, type;
568 unsigned base;
569
570 type = spi_get_device_id(spi)->driver_data;
571
572 pdata = spi->dev.platform_data;
573 if (!pdata || !gpio_is_valid(pdata->base)) {
574 dev_dbg(&spi->dev, "invalid or missing platform data\n");
575 return -EINVAL;
576 }
577
578 for (addr = 0; addr < ARRAY_SIZE(pdata->chip); addr++) {
579 if (!pdata->chip[addr].is_present)
580 continue;
581 chips++;
582 if ((type == MCP_TYPE_S08) && (addr > 3)) {
583 dev_err(&spi->dev,
584 "mcp23s08 only supports address 0..3\n");
585 return -EINVAL;
586 }
587 }
588 if (!chips)
589 return -ENODEV;
590
591 data = kzalloc(sizeof *data + chips * sizeof(struct mcp23s08),
592 GFP_KERNEL);
593 if (!data)
594 return -ENOMEM;
595 spi_set_drvdata(spi, data);
596
597 base = pdata->base;
598 for (addr = 0; addr < ARRAY_SIZE(pdata->chip); addr++) {
599 if (!pdata->chip[addr].is_present)
600 continue;
601 chips--;
602 data->mcp[addr] = &data->chip[chips];
603 status = mcp23s08_probe_one(data->mcp[addr], &spi->dev, spi,
604 0x40 | (addr << 1), type, base,
605 pdata->chip[addr].pullups);
606 if (status < 0)
607 goto fail;
608
609 base += (type == MCP_TYPE_S17) ? 16 : 8;
610 }
611 data->ngpio = base - pdata->base;
612
613 /* NOTE: these chips have a relatively sane IRQ framework, with
614 * per-signal masking and level/edge triggering. It's not yet
615 * handled here...
616 */
617
618 return 0;
619
620 fail:
621 for (addr = 0; addr < ARRAY_SIZE(data->mcp); addr++) {
622 int tmp;
623
624 if (!data->mcp[addr])
625 continue;
626 tmp = gpiochip_remove(&data->mcp[addr]->chip);
627 if (tmp < 0)
628 dev_err(&spi->dev, "%s --> %d\n", "remove", tmp);
629 }
630 kfree(data);
631 return status;
632 }
633
mcp23s08_remove(struct spi_device * spi)634 static int mcp23s08_remove(struct spi_device *spi)
635 {
636 struct mcp23s08_driver_data *data = spi_get_drvdata(spi);
637 unsigned addr;
638 int status = 0;
639
640 for (addr = 0; addr < ARRAY_SIZE(data->mcp); addr++) {
641 int tmp;
642
643 if (!data->mcp[addr])
644 continue;
645
646 tmp = gpiochip_remove(&data->mcp[addr]->chip);
647 if (tmp < 0) {
648 dev_err(&spi->dev, "%s --> %d\n", "remove", tmp);
649 status = tmp;
650 }
651 }
652 if (status == 0)
653 kfree(data);
654 return status;
655 }
656
657 static const struct spi_device_id mcp23s08_ids[] = {
658 { "mcp23s08", MCP_TYPE_S08 },
659 { "mcp23s17", MCP_TYPE_S17 },
660 { },
661 };
662 MODULE_DEVICE_TABLE(spi, mcp23s08_ids);
663
664 static struct spi_driver mcp23s08_driver = {
665 .probe = mcp23s08_probe,
666 .remove = mcp23s08_remove,
667 .id_table = mcp23s08_ids,
668 .driver = {
669 .name = "mcp23s08",
670 .owner = THIS_MODULE,
671 },
672 };
673
mcp23s08_spi_init(void)674 static int __init mcp23s08_spi_init(void)
675 {
676 return spi_register_driver(&mcp23s08_driver);
677 }
678
mcp23s08_spi_exit(void)679 static void mcp23s08_spi_exit(void)
680 {
681 spi_unregister_driver(&mcp23s08_driver);
682 }
683
684 #else
685
mcp23s08_spi_init(void)686 static int __init mcp23s08_spi_init(void) { return 0; }
mcp23s08_spi_exit(void)687 static void mcp23s08_spi_exit(void) { }
688
689 #endif /* CONFIG_SPI_MASTER */
690
691 /*----------------------------------------------------------------------*/
692
mcp23s08_init(void)693 static int __init mcp23s08_init(void)
694 {
695 int ret;
696
697 ret = mcp23s08_spi_init();
698 if (ret)
699 goto spi_fail;
700
701 ret = mcp23s08_i2c_init();
702 if (ret)
703 goto i2c_fail;
704
705 return 0;
706
707 i2c_fail:
708 mcp23s08_spi_exit();
709 spi_fail:
710 return ret;
711 }
712 /* register after spi/i2c postcore initcall and before
713 * subsys initcalls that may rely on these GPIOs
714 */
715 subsys_initcall(mcp23s08_init);
716
mcp23s08_exit(void)717 static void __exit mcp23s08_exit(void)
718 {
719 mcp23s08_spi_exit();
720 mcp23s08_i2c_exit();
721 }
722 module_exit(mcp23s08_exit);
723
724 MODULE_LICENSE("GPL");
725