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Merge tag 'imx-fixes-3.13-2' of git://git.linaro.org/people/shawnguo/linux-2.6 into...
[linux-2.6.git] / drivers / gpio / gpio-mcp23s08.c
blob2deb0c5e54a443a7546c7e4c63bf1e6a833c0d50
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 #include <linux/of.h>
16 #include <linux/of_device.h>
17
18 /**
19 * MCP types supported by driver
20 */
21 #define MCP_TYPE_S08 0
22 #define MCP_TYPE_S17 1
23 #define MCP_TYPE_008 2
24 #define MCP_TYPE_017 3
25
26 /* Registers are all 8 bits wide.
27 *
28 * The mcp23s17 has twice as many bits, and can be configured to work
29 * with either 16 bit registers or with two adjacent 8 bit banks.
30 */
31 #define MCP_IODIR 0x00 /* init/reset: all ones */
32 #define MCP_IPOL 0x01
33 #define MCP_GPINTEN 0x02
34 #define MCP_DEFVAL 0x03
35 #define MCP_INTCON 0x04
36 #define MCP_IOCON 0x05
37 # define IOCON_SEQOP (1 << 5)
38 # define IOCON_HAEN (1 << 3)
39 # define IOCON_ODR (1 << 2)
40 # define IOCON_INTPOL (1 << 1)
41 #define MCP_GPPU 0x06
42 #define MCP_INTF 0x07
43 #define MCP_INTCAP 0x08
44 #define MCP_GPIO 0x09
45 #define MCP_OLAT 0x0a
46
47 struct mcp23s08;
48
49 struct mcp23s08_ops {
50 int (*read)(struct mcp23s08 *mcp, unsigned reg);
51 int (*write)(struct mcp23s08 *mcp, unsigned reg, unsigned val);
52 int (*read_regs)(struct mcp23s08 *mcp, unsigned reg,
53 u16 *vals, unsigned n);
54 };
55
56 struct mcp23s08 {
57 u8 addr;
58
59 u16 cache[11];
60 /* lock protects the cached values */
61 struct mutex lock;
62
63 struct gpio_chip chip;
64
65 const struct mcp23s08_ops *ops;
66 void *data; /* ops specific data */
67 };
68
69 /* A given spi_device can represent up to eight mcp23sxx chips
70 * sharing the same chipselect but using different addresses
71 * (e.g. chips #0 and #3 might be populated, but not #1 or $2).
72 * Driver data holds all the per-chip data.
73 */
74 struct mcp23s08_driver_data {
75 unsigned ngpio;
76 struct mcp23s08 *mcp[8];
77 struct mcp23s08 chip[];
78 };
79
80 /*----------------------------------------------------------------------*/
81
82 #if IS_ENABLED(CONFIG_I2C)
83
84 static int mcp23008_read(struct mcp23s08 *mcp, unsigned reg)
85 {
86 return i2c_smbus_read_byte_data(mcp->data, reg);
87 }
88
89 static int mcp23008_write(struct mcp23s08 *mcp, unsigned reg, unsigned val)
90 {
91 return i2c_smbus_write_byte_data(mcp->data, reg, val);
92 }
93
94 static int
95 mcp23008_read_regs(struct mcp23s08 *mcp, unsigned reg, u16 *vals, unsigned n)
96 {
97 while (n--) {
98 int ret = mcp23008_read(mcp, reg++);
99 if (ret < 0)
100 return ret;
101 *vals++ = ret;
102 }
103
104 return 0;
105 }
106
107 static int mcp23017_read(struct mcp23s08 *mcp, unsigned reg)
108 {
109 return i2c_smbus_read_word_data(mcp->data, reg << 1);
110 }
111
112 static int mcp23017_write(struct mcp23s08 *mcp, unsigned reg, unsigned val)
113 {
114 return i2c_smbus_write_word_data(mcp->data, reg << 1, val);
115 }
116
117 static int
118 mcp23017_read_regs(struct mcp23s08 *mcp, unsigned reg, u16 *vals, unsigned n)
119 {
120 while (n--) {
121 int ret = mcp23017_read(mcp, reg++);
122 if (ret < 0)
123 return ret;
124 *vals++ = ret;
125 }
126
127 return 0;
128 }
129
130 static const struct mcp23s08_ops mcp23008_ops = {
131 .read = mcp23008_read,
132 .write = mcp23008_write,
133 .read_regs = mcp23008_read_regs,
134 };
135
136 static const struct mcp23s08_ops mcp23017_ops = {
137 .read = mcp23017_read,
138 .write = mcp23017_write,
139 .read_regs = mcp23017_read_regs,
140 };
141
142 #endif /* CONFIG_I2C */
143
144 /*----------------------------------------------------------------------*/
145
146 #ifdef CONFIG_SPI_MASTER
147
148 static int mcp23s08_read(struct mcp23s08 *mcp, unsigned reg)
149 {
150 u8 tx[2], rx[1];
151 int status;
152
153 tx[0] = mcp->addr | 0x01;
154 tx[1] = reg;
155 status = spi_write_then_read(mcp->data, tx, sizeof tx, rx, sizeof rx);
156 return (status < 0) ? status : rx[0];
157 }
158
159 static int mcp23s08_write(struct mcp23s08 *mcp, unsigned reg, unsigned val)
160 {
161 u8 tx[3];
162
163 tx[0] = mcp->addr;
164 tx[1] = reg;
165 tx[2] = val;
166 return spi_write_then_read(mcp->data, tx, sizeof tx, NULL, 0);
167 }
168
169 static int
170 mcp23s08_read_regs(struct mcp23s08 *mcp, unsigned reg, u16 *vals, unsigned n)
171 {
172 u8 tx[2], *tmp;
173 int status;
174
175 if ((n + reg) > sizeof mcp->cache)
176 return -EINVAL;
177 tx[0] = mcp->addr | 0x01;
178 tx[1] = reg;
179
180 tmp = (u8 *)vals;
181 status = spi_write_then_read(mcp->data, tx, sizeof tx, tmp, n);
182 if (status >= 0) {
183 while (n--)
184 vals[n] = tmp[n]; /* expand to 16bit */
185 }
186 return status;
187 }
188
189 static int mcp23s17_read(struct mcp23s08 *mcp, unsigned reg)
190 {
191 u8 tx[2], rx[2];
192 int status;
193
194 tx[0] = mcp->addr | 0x01;
195 tx[1] = reg << 1;
196 status = spi_write_then_read(mcp->data, tx, sizeof tx, rx, sizeof rx);
197 return (status < 0) ? status : (rx[0] | (rx[1] << 8));
198 }
199
200 static int mcp23s17_write(struct mcp23s08 *mcp, unsigned reg, unsigned val)
201 {
202 u8 tx[4];
203
204 tx[0] = mcp->addr;
205 tx[1] = reg << 1;
206 tx[2] = val;
207 tx[3] = val >> 8;
208 return spi_write_then_read(mcp->data, tx, sizeof tx, NULL, 0);
209 }
210
211 static int
212 mcp23s17_read_regs(struct mcp23s08 *mcp, unsigned reg, u16 *vals, unsigned n)
213 {
214 u8 tx[2];
215 int status;
216
217 if ((n + reg) > sizeof mcp->cache)
218 return -EINVAL;
219 tx[0] = mcp->addr | 0x01;
220 tx[1] = reg << 1;
221
222 status = spi_write_then_read(mcp->data, tx, sizeof tx,
223 (u8 *)vals, n * 2);
224 if (status >= 0) {
225 while (n--)
226 vals[n] = __le16_to_cpu((__le16)vals[n]);
227 }
228
229 return status;
230 }
231
232 static const struct mcp23s08_ops mcp23s08_ops = {
233 .read = mcp23s08_read,
234 .write = mcp23s08_write,
235 .read_regs = mcp23s08_read_regs,
236 };
237
238 static const struct mcp23s08_ops mcp23s17_ops = {
239 .read = mcp23s17_read,
240 .write = mcp23s17_write,
241 .read_regs = mcp23s17_read_regs,
242 };
243
244 #endif /* CONFIG_SPI_MASTER */
245
246 /*----------------------------------------------------------------------*/
247
248 static int mcp23s08_direction_input(struct gpio_chip *chip, unsigned offset)
249 {
250 struct mcp23s08 *mcp = container_of(chip, struct mcp23s08, chip);
251 int status;
252
253 mutex_lock(&mcp->lock);
254 mcp->cache[MCP_IODIR] |= (1 << offset);
255 status = mcp->ops->write(mcp, MCP_IODIR, mcp->cache[MCP_IODIR]);
256 mutex_unlock(&mcp->lock);
257 return status;
258 }
259
260 static int mcp23s08_get(struct gpio_chip *chip, unsigned offset)
261 {
262 struct mcp23s08 *mcp = container_of(chip, struct mcp23s08, chip);
263 int status;
264
265 mutex_lock(&mcp->lock);
266
267 /* REVISIT reading this clears any IRQ ... */
268 status = mcp->ops->read(mcp, MCP_GPIO);
269 if (status < 0)
270 status = 0;
271 else {
272 mcp->cache[MCP_GPIO] = status;
273 status = !!(status & (1 << offset));
274 }
275 mutex_unlock(&mcp->lock);
276 return status;
277 }
278
279 static int __mcp23s08_set(struct mcp23s08 *mcp, unsigned mask, int value)
280 {
281 unsigned olat = mcp->cache[MCP_OLAT];
282
283 if (value)
284 olat |= mask;
285 else
286 olat &= ~mask;
287 mcp->cache[MCP_OLAT] = olat;
288 return mcp->ops->write(mcp, MCP_OLAT, olat);
289 }
290
291 static void mcp23s08_set(struct gpio_chip *chip, unsigned offset, int value)
292 {
293 struct mcp23s08 *mcp = container_of(chip, struct mcp23s08, chip);
294 unsigned mask = 1 << offset;
295
296 mutex_lock(&mcp->lock);
297 __mcp23s08_set(mcp, mask, value);
298 mutex_unlock(&mcp->lock);
299 }
300
301 static int
302 mcp23s08_direction_output(struct gpio_chip *chip, unsigned offset, int value)
303 {
304 struct mcp23s08 *mcp = container_of(chip, struct mcp23s08, chip);
305 unsigned mask = 1 << offset;
306 int status;
307
308 mutex_lock(&mcp->lock);
309 status = __mcp23s08_set(mcp, mask, value);
310 if (status == 0) {
311 mcp->cache[MCP_IODIR] &= ~mask;
312 status = mcp->ops->write(mcp, MCP_IODIR, mcp->cache[MCP_IODIR]);
313 }
314 mutex_unlock(&mcp->lock);
315 return status;
316 }
317
318 /*----------------------------------------------------------------------*/
319
320 #ifdef CONFIG_DEBUG_FS
321
322 #include <linux/seq_file.h>
323
324 /*
325 * This shows more info than the generic gpio dump code:
326 * pullups, deglitching, open drain drive.
327 */
328 static void mcp23s08_dbg_show(struct seq_file *s, struct gpio_chip *chip)
329 {
330 struct mcp23s08 *mcp;
331 char bank;
332 int t;
333 unsigned mask;
334
335 mcp = container_of(chip, struct mcp23s08, chip);
336
337 /* NOTE: we only handle one bank for now ... */
338 bank = '0' + ((mcp->addr >> 1) & 0x7);
339
340 mutex_lock(&mcp->lock);
341 t = mcp->ops->read_regs(mcp, 0, mcp->cache, ARRAY_SIZE(mcp->cache));
342 if (t < 0) {
343 seq_printf(s, " I/O ERROR %d\n", t);
344 goto done;
345 }
346
347 for (t = 0, mask = 1; t < chip->ngpio; t++, mask <<= 1) {
348 const char *label;
349
350 label = gpiochip_is_requested(chip, t);
351 if (!label)
352 continue;
353
354 seq_printf(s, " gpio-%-3d P%c.%d (%-12s) %s %s %s",
355 chip->base + t, bank, t, label,
356 (mcp->cache[MCP_IODIR] & mask) ? "in " : "out",
357 (mcp->cache[MCP_GPIO] & mask) ? "hi" : "lo",
358 (mcp->cache[MCP_GPPU] & mask) ? "up" : " ");
359 /* NOTE: ignoring the irq-related registers */
360 seq_printf(s, "\n");
361 }
362 done:
363 mutex_unlock(&mcp->lock);
364 }
365
366 #else
367 #define mcp23s08_dbg_show NULL
368 #endif
369
370 /*----------------------------------------------------------------------*/
371
372 static int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev,
373 void *data, unsigned addr,
374 unsigned type, unsigned base, unsigned pullups)
375 {
376 int status;
377
378 mutex_init(&mcp->lock);
379
380 mcp->data = data;
381 mcp->addr = addr;
382
383 mcp->chip.direction_input = mcp23s08_direction_input;
384 mcp->chip.get = mcp23s08_get;
385 mcp->chip.direction_output = mcp23s08_direction_output;
386 mcp->chip.set = mcp23s08_set;
387 mcp->chip.dbg_show = mcp23s08_dbg_show;
388 #ifdef CONFIG_OF
389 mcp->chip.of_gpio_n_cells = 2;
390 mcp->chip.of_node = dev->of_node;
391 #endif
392
393 switch (type) {
394 #ifdef CONFIG_SPI_MASTER
395 case MCP_TYPE_S08:
396 mcp->ops = &mcp23s08_ops;
397 mcp->chip.ngpio = 8;
398 mcp->chip.label = "mcp23s08";
399 break;
400
401 case MCP_TYPE_S17:
402 mcp->ops = &mcp23s17_ops;
403 mcp->chip.ngpio = 16;
404 mcp->chip.label = "mcp23s17";
405 break;
406 #endif /* CONFIG_SPI_MASTER */
407
408 #if IS_ENABLED(CONFIG_I2C)
409 case MCP_TYPE_008:
410 mcp->ops = &mcp23008_ops;
411 mcp->chip.ngpio = 8;
412 mcp->chip.label = "mcp23008";
413 break;
414
415 case MCP_TYPE_017:
416 mcp->ops = &mcp23017_ops;
417 mcp->chip.ngpio = 16;
418 mcp->chip.label = "mcp23017";
419 break;
420 #endif /* CONFIG_I2C */
421
422 default:
423 dev_err(dev, "invalid device type (%d)\n", type);
424 return -EINVAL;
425 }
426
427 mcp->chip.base = base;
428 mcp->chip.can_sleep = 1;
429 mcp->chip.dev = dev;
430 mcp->chip.owner = THIS_MODULE;
431
432 /* verify MCP_IOCON.SEQOP = 0, so sequential reads work,
433 * and MCP_IOCON.HAEN = 1, so we work with all chips.
434 */
435 status = mcp->ops->read(mcp, MCP_IOCON);
436 if (status < 0)
437 goto fail;
438 if ((status & IOCON_SEQOP) || !(status & IOCON_HAEN)) {
439 /* mcp23s17 has IOCON twice, make sure they are in sync */
440 status &= ~(IOCON_SEQOP | (IOCON_SEQOP << 8));
441 status |= IOCON_HAEN | (IOCON_HAEN << 8);
442 status = mcp->ops->write(mcp, MCP_IOCON, status);
443 if (status < 0)
444 goto fail;
445 }
446
447 /* configure ~100K pullups */
448 status = mcp->ops->write(mcp, MCP_GPPU, pullups);
449 if (status < 0)
450 goto fail;
451
452 status = mcp->ops->read_regs(mcp, 0, mcp->cache, ARRAY_SIZE(mcp->cache));
453 if (status < 0)
454 goto fail;
455
456 /* disable inverter on input */
457 if (mcp->cache[MCP_IPOL] != 0) {
458 mcp->cache[MCP_IPOL] = 0;
459 status = mcp->ops->write(mcp, MCP_IPOL, 0);
460 if (status < 0)
461 goto fail;
462 }
463
464 /* disable irqs */
465 if (mcp->cache[MCP_GPINTEN] != 0) {
466 mcp->cache[MCP_GPINTEN] = 0;
467 status = mcp->ops->write(mcp, MCP_GPINTEN, 0);
468 if (status < 0)
469 goto fail;
470 }
471
472 status = gpiochip_add(&mcp->chip);
473 fail:
474 if (status < 0)
475 dev_dbg(dev, "can't setup chip %d, --> %d\n",
476 addr, status);
477 return status;
478 }
479
480 /*----------------------------------------------------------------------*/
481
482 #ifdef CONFIG_OF
483 #ifdef CONFIG_SPI_MASTER
484 static struct of_device_id mcp23s08_spi_of_match[] = {
485 {
486 .compatible = "microchip,mcp23s08",
487 .data = (void *) MCP_TYPE_S08,
488 },
489 {
490 .compatible = "microchip,mcp23s17",
491 .data = (void *) MCP_TYPE_S17,
492 },
493 /* NOTE: The use of the mcp prefix is deprecated and will be removed. */
494 {
495 .compatible = "mcp,mcp23s08",
496 .data = (void *) MCP_TYPE_S08,
497 },
498 {
499 .compatible = "mcp,mcp23s17",
500 .data = (void *) MCP_TYPE_S17,
501 },
502 { },
503 };
504 MODULE_DEVICE_TABLE(of, mcp23s08_spi_of_match);
505 #endif
506
507 #if IS_ENABLED(CONFIG_I2C)
508 static struct of_device_id mcp23s08_i2c_of_match[] = {
509 {
510 .compatible = "microchip,mcp23008",
511 .data = (void *) MCP_TYPE_008,
512 },
513 {
514 .compatible = "microchip,mcp23017",
515 .data = (void *) MCP_TYPE_017,
516 },
517 /* NOTE: The use of the mcp prefix is deprecated and will be removed. */
518 {
519 .compatible = "mcp,mcp23008",
520 .data = (void *) MCP_TYPE_008,
521 },
522 {
523 .compatible = "mcp,mcp23017",
524 .data = (void *) MCP_TYPE_017,
525 },
526 { },
527 };
528 MODULE_DEVICE_TABLE(of, mcp23s08_i2c_of_match);
529 #endif
530 #endif /* CONFIG_OF */
531
532
533 #if IS_ENABLED(CONFIG_I2C)
534
535 static int mcp230xx_probe(struct i2c_client *client,
536 const struct i2c_device_id *id)
537 {
538 struct mcp23s08_platform_data *pdata;
539 struct mcp23s08 *mcp;
540 int status, base, pullups;
541 const struct of_device_id *match;
542
543 match = of_match_device(of_match_ptr(mcp23s08_i2c_of_match),
544 &client->dev);
545 pdata = dev_get_platdata(&client->dev);
546 if (match || !pdata) {
547 base = -1;
548 pullups = 0;
549 } else {
550 if (!gpio_is_valid(pdata->base)) {
551 dev_dbg(&client->dev, "invalid platform data\n");
552 return -EINVAL;
553 }
554 base = pdata->base;
555 pullups = pdata->chip[0].pullups;
556 }
557
558 mcp = kzalloc(sizeof *mcp, GFP_KERNEL);
559 if (!mcp)
560 return -ENOMEM;
561
562 status = mcp23s08_probe_one(mcp, &client->dev, client, client->addr,
563 id->driver_data, base, pullups);
564 if (status)
565 goto fail;
566
567 i2c_set_clientdata(client, mcp);
568
569 return 0;
570
571 fail:
572 kfree(mcp);
573
574 return status;
575 }
576
577 static int mcp230xx_remove(struct i2c_client *client)
578 {
579 struct mcp23s08 *mcp = i2c_get_clientdata(client);
580 int status;
581
582 status = gpiochip_remove(&mcp->chip);
583 if (status == 0)
584 kfree(mcp);
585
586 return status;
587 }
588
589 static const struct i2c_device_id mcp230xx_id[] = {
590 { "mcp23008", MCP_TYPE_008 },
591 { "mcp23017", MCP_TYPE_017 },
592 { },
593 };
594 MODULE_DEVICE_TABLE(i2c, mcp230xx_id);
595
596 static struct i2c_driver mcp230xx_driver = {
597 .driver = {
598 .name = "mcp230xx",
599 .owner = THIS_MODULE,
600 .of_match_table = of_match_ptr(mcp23s08_i2c_of_match),
601 },
602 .probe = mcp230xx_probe,
603 .remove = mcp230xx_remove,
604 .id_table = mcp230xx_id,
605 };
606
607 static int __init mcp23s08_i2c_init(void)
608 {
609 return i2c_add_driver(&mcp230xx_driver);
610 }
611
612 static void mcp23s08_i2c_exit(void)
613 {
614 i2c_del_driver(&mcp230xx_driver);
615 }
616
617 #else
618
619 static int __init mcp23s08_i2c_init(void) { return 0; }
620 static void mcp23s08_i2c_exit(void) { }
621
622 #endif /* CONFIG_I2C */
623
624 /*----------------------------------------------------------------------*/
625
626 #ifdef CONFIG_SPI_MASTER
627
628 static int mcp23s08_probe(struct spi_device *spi)
629 {
630 struct mcp23s08_platform_data *pdata;
631 unsigned addr;
632 unsigned chips = 0;
633 struct mcp23s08_driver_data *data;
634 int status, type;
635 unsigned base = -1,
636 ngpio = 0,
637 pullups[ARRAY_SIZE(pdata->chip)];
638 const struct of_device_id *match;
639 u32 spi_present_mask = 0;
640
641 match = of_match_device(of_match_ptr(mcp23s08_spi_of_match), &spi->dev);
642 if (match) {
643 type = (int)match->data;
644 status = of_property_read_u32(spi->dev.of_node,
645 "microchip,spi-present-mask", &spi_present_mask);
646 if (status) {
647 status = of_property_read_u32(spi->dev.of_node,
648 "mcp,spi-present-mask", &spi_present_mask);
649 if (status) {
650 dev_err(&spi->dev,
651 "DT has no spi-present-mask\n");
652 return -ENODEV;
653 }
654 }
655 if ((spi_present_mask <= 0) || (spi_present_mask >= 256)) {
656 dev_err(&spi->dev, "invalid spi-present-mask\n");
657 return -ENODEV;
658 }
659
660 for (addr = 0; addr < ARRAY_SIZE(pdata->chip); addr++)
661 pullups[addr] = 0;
662 } else {
663 type = spi_get_device_id(spi)->driver_data;
664 pdata = dev_get_platdata(&spi->dev);
665 if (!pdata || !gpio_is_valid(pdata->base)) {
666 dev_dbg(&spi->dev,
667 "invalid or missing platform data\n");
668 return -EINVAL;
669 }
670
671 for (addr = 0; addr < ARRAY_SIZE(pdata->chip); addr++) {
672 if (!pdata->chip[addr].is_present)
673 continue;
674 chips++;
675 if ((type == MCP_TYPE_S08) && (addr > 3)) {
676 dev_err(&spi->dev,
677 "mcp23s08 only supports address 0..3\n");
678 return -EINVAL;
679 }
680 spi_present_mask |= 1 << addr;
681 pullups[addr] = pdata->chip[addr].pullups;
682 }
683
684 if (!chips)
685 return -ENODEV;
686
687 base = pdata->base;
688 }
689
690 data = kzalloc(sizeof *data + chips * sizeof(struct mcp23s08),
691 GFP_KERNEL);
692 if (!data)
693 return -ENOMEM;
694 spi_set_drvdata(spi, data);
695
696 for (addr = 0; addr < ARRAY_SIZE(pdata->chip); addr++) {
697 if (!(spi_present_mask & (1 << addr)))
698 continue;
699 chips--;
700 data->mcp[addr] = &data->chip[chips];
701 status = mcp23s08_probe_one(data->mcp[addr], &spi->dev, spi,
702 0x40 | (addr << 1), type, base,
703 pullups[addr]);
704 if (status < 0)
705 goto fail;
706
707 if (base != -1)
708 base += (type == MCP_TYPE_S17) ? 16 : 8;
709 ngpio += (type == MCP_TYPE_S17) ? 16 : 8;
710 }
711 data->ngpio = ngpio;
712
713 /* NOTE: these chips have a relatively sane IRQ framework, with
714 * per-signal masking and level/edge triggering. It's not yet
715 * handled here...
716 */
717
718 return 0;
719
720 fail:
721 for (addr = 0; addr < ARRAY_SIZE(data->mcp); addr++) {
722 int tmp;
723
724 if (!data->mcp[addr])
725 continue;
726 tmp = gpiochip_remove(&data->mcp[addr]->chip);
727 if (tmp < 0)
728 dev_err(&spi->dev, "%s --> %d\n", "remove", tmp);
729 }
730 kfree(data);
731 return status;
732 }
733
734 static int mcp23s08_remove(struct spi_device *spi)
735 {
736 struct mcp23s08_driver_data *data = spi_get_drvdata(spi);
737 unsigned addr;
738 int status = 0;
739
740 for (addr = 0; addr < ARRAY_SIZE(data->mcp); addr++) {
741 int tmp;
742
743 if (!data->mcp[addr])
744 continue;
745
746 tmp = gpiochip_remove(&data->mcp[addr]->chip);
747 if (tmp < 0) {
748 dev_err(&spi->dev, "%s --> %d\n", "remove", tmp);
749 status = tmp;
750 }
751 }
752 if (status == 0)
753 kfree(data);
754 return status;
755 }
756
757 static const struct spi_device_id mcp23s08_ids[] = {
758 { "mcp23s08", MCP_TYPE_S08 },
759 { "mcp23s17", MCP_TYPE_S17 },
760 { },
761 };
762 MODULE_DEVICE_TABLE(spi, mcp23s08_ids);
763
764 static struct spi_driver mcp23s08_driver = {
765 .probe = mcp23s08_probe,
766 .remove = mcp23s08_remove,
767 .id_table = mcp23s08_ids,
768 .driver = {
769 .name = "mcp23s08",
770 .owner = THIS_MODULE,
771 .of_match_table = of_match_ptr(mcp23s08_spi_of_match),
772 },
773 };
774
775 static int __init mcp23s08_spi_init(void)
776 {
777 return spi_register_driver(&mcp23s08_driver);
778 }
779
780 static void mcp23s08_spi_exit(void)
781 {
782 spi_unregister_driver(&mcp23s08_driver);
783 }
784
785 #else
786
787 static int __init mcp23s08_spi_init(void) { return 0; }
788 static void mcp23s08_spi_exit(void) { }
789
790 #endif /* CONFIG_SPI_MASTER */
791
792 /*----------------------------------------------------------------------*/
793
794 static int __init mcp23s08_init(void)
795 {
796 int ret;
797
798 ret = mcp23s08_spi_init();
799 if (ret)
800 goto spi_fail;
801
802 ret = mcp23s08_i2c_init();
803 if (ret)
804 goto i2c_fail;
805
806 return 0;
807
808 i2c_fail:
809 mcp23s08_spi_exit();
810 spi_fail:
811 return ret;
812 }
813 /* register after spi/i2c postcore initcall and before
814 * subsys initcalls that may rely on these GPIOs
815 */
816 subsys_initcall(mcp23s08_init);
817
818 static void __exit mcp23s08_exit(void)
819 {
820 mcp23s08_spi_exit();
821 mcp23s08_i2c_exit();
822 }
823 module_exit(mcp23s08_exit);
824
825 MODULE_LICENSE("GPL");
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