xref: /openbmc/linux/drivers/gpio/gpio-pca953x.c (revision d2999e1b)
1 /*
2  *  PCA953x 4/8/16/24/40 bit I/O ports
3  *
4  *  Copyright (C) 2005 Ben Gardner <bgardner@wabtec.com>
5  *  Copyright (C) 2007 Marvell International Ltd.
6  *
7  *  Derived from drivers/i2c/chips/pca9539.c
8  *
9  *  This program is free software; you can redistribute it and/or modify
10  *  it under the terms of the GNU General Public License as published by
11  *  the Free Software Foundation; version 2 of the License.
12  */
13 
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <linux/gpio.h>
17 #include <linux/interrupt.h>
18 #include <linux/i2c.h>
19 #include <linux/platform_data/pca953x.h>
20 #include <linux/slab.h>
21 #ifdef CONFIG_OF_GPIO
22 #include <linux/of_platform.h>
23 #endif
24 
25 #define PCA953X_INPUT		0
26 #define PCA953X_OUTPUT		1
27 #define PCA953X_INVERT		2
28 #define PCA953X_DIRECTION	3
29 
30 #define REG_ADDR_AI		0x80
31 
32 #define PCA957X_IN		0
33 #define PCA957X_INVRT		1
34 #define PCA957X_BKEN		2
35 #define PCA957X_PUPD		3
36 #define PCA957X_CFG		4
37 #define PCA957X_OUT		5
38 #define PCA957X_MSK		6
39 #define PCA957X_INTS		7
40 
41 #define PCA_GPIO_MASK		0x00FF
42 #define PCA_INT			0x0100
43 #define PCA953X_TYPE		0x1000
44 #define PCA957X_TYPE		0x2000
45 
46 static const struct i2c_device_id pca953x_id[] = {
47 	{ "pca9505", 40 | PCA953X_TYPE | PCA_INT, },
48 	{ "pca9534", 8  | PCA953X_TYPE | PCA_INT, },
49 	{ "pca9535", 16 | PCA953X_TYPE | PCA_INT, },
50 	{ "pca9536", 4  | PCA953X_TYPE, },
51 	{ "pca9537", 4  | PCA953X_TYPE | PCA_INT, },
52 	{ "pca9538", 8  | PCA953X_TYPE | PCA_INT, },
53 	{ "pca9539", 16 | PCA953X_TYPE | PCA_INT, },
54 	{ "pca9554", 8  | PCA953X_TYPE | PCA_INT, },
55 	{ "pca9555", 16 | PCA953X_TYPE | PCA_INT, },
56 	{ "pca9556", 8  | PCA953X_TYPE, },
57 	{ "pca9557", 8  | PCA953X_TYPE, },
58 	{ "pca9574", 8  | PCA957X_TYPE | PCA_INT, },
59 	{ "pca9575", 16 | PCA957X_TYPE | PCA_INT, },
60 	{ "pca9698", 40 | PCA953X_TYPE, },
61 
62 	{ "max7310", 8  | PCA953X_TYPE, },
63 	{ "max7312", 16 | PCA953X_TYPE | PCA_INT, },
64 	{ "max7313", 16 | PCA953X_TYPE | PCA_INT, },
65 	{ "max7315", 8  | PCA953X_TYPE | PCA_INT, },
66 	{ "pca6107", 8  | PCA953X_TYPE | PCA_INT, },
67 	{ "tca6408", 8  | PCA953X_TYPE | PCA_INT, },
68 	{ "tca6416", 16 | PCA953X_TYPE | PCA_INT, },
69 	{ "tca6424", 24 | PCA953X_TYPE | PCA_INT, },
70 	{ "xra1202", 8  | PCA953X_TYPE },
71 	{ }
72 };
73 MODULE_DEVICE_TABLE(i2c, pca953x_id);
74 
75 #define MAX_BANK 5
76 #define BANK_SZ 8
77 
78 #define NBANK(chip) (chip->gpio_chip.ngpio / BANK_SZ)
79 
80 struct pca953x_chip {
81 	unsigned gpio_start;
82 	u8 reg_output[MAX_BANK];
83 	u8 reg_direction[MAX_BANK];
84 	struct mutex i2c_lock;
85 
86 #ifdef CONFIG_GPIO_PCA953X_IRQ
87 	struct mutex irq_lock;
88 	u8 irq_mask[MAX_BANK];
89 	u8 irq_stat[MAX_BANK];
90 	u8 irq_trig_raise[MAX_BANK];
91 	u8 irq_trig_fall[MAX_BANK];
92 #endif
93 
94 	struct i2c_client *client;
95 	struct gpio_chip gpio_chip;
96 	const char *const *names;
97 	int	chip_type;
98 };
99 
100 static inline struct pca953x_chip *to_pca(struct gpio_chip *gc)
101 {
102 	return container_of(gc, struct pca953x_chip, gpio_chip);
103 }
104 
105 static int pca953x_read_single(struct pca953x_chip *chip, int reg, u32 *val,
106 				int off)
107 {
108 	int ret;
109 	int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
110 	int offset = off / BANK_SZ;
111 
112 	ret = i2c_smbus_read_byte_data(chip->client,
113 				(reg << bank_shift) + offset);
114 	*val = ret;
115 
116 	if (ret < 0) {
117 		dev_err(&chip->client->dev, "failed reading register\n");
118 		return ret;
119 	}
120 
121 	return 0;
122 }
123 
124 static int pca953x_write_single(struct pca953x_chip *chip, int reg, u32 val,
125 				int off)
126 {
127 	int ret = 0;
128 	int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
129 	int offset = off / BANK_SZ;
130 
131 	ret = i2c_smbus_write_byte_data(chip->client,
132 					(reg << bank_shift) + offset, val);
133 
134 	if (ret < 0) {
135 		dev_err(&chip->client->dev, "failed writing register\n");
136 		return ret;
137 	}
138 
139 	return 0;
140 }
141 
142 static int pca953x_write_regs(struct pca953x_chip *chip, int reg, u8 *val)
143 {
144 	int ret = 0;
145 
146 	if (chip->gpio_chip.ngpio <= 8)
147 		ret = i2c_smbus_write_byte_data(chip->client, reg, *val);
148 	else if (chip->gpio_chip.ngpio >= 24) {
149 		int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
150 		ret = i2c_smbus_write_i2c_block_data(chip->client,
151 					(reg << bank_shift) | REG_ADDR_AI,
152 					NBANK(chip), val);
153 	} else {
154 		switch (chip->chip_type) {
155 		case PCA953X_TYPE:
156 			ret = i2c_smbus_write_word_data(chip->client,
157 							reg << 1, (u16) *val);
158 			break;
159 		case PCA957X_TYPE:
160 			ret = i2c_smbus_write_byte_data(chip->client, reg << 1,
161 							val[0]);
162 			if (ret < 0)
163 				break;
164 			ret = i2c_smbus_write_byte_data(chip->client,
165 							(reg << 1) + 1,
166 							val[1]);
167 			break;
168 		}
169 	}
170 
171 	if (ret < 0) {
172 		dev_err(&chip->client->dev, "failed writing register\n");
173 		return ret;
174 	}
175 
176 	return 0;
177 }
178 
179 static int pca953x_read_regs(struct pca953x_chip *chip, int reg, u8 *val)
180 {
181 	int ret;
182 
183 	if (chip->gpio_chip.ngpio <= 8) {
184 		ret = i2c_smbus_read_byte_data(chip->client, reg);
185 		*val = ret;
186 	} else if (chip->gpio_chip.ngpio >= 24) {
187 		int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
188 
189 		ret = i2c_smbus_read_i2c_block_data(chip->client,
190 					(reg << bank_shift) | REG_ADDR_AI,
191 					NBANK(chip), val);
192 	} else {
193 		ret = i2c_smbus_read_word_data(chip->client, reg << 1);
194 		val[0] = (u16)ret & 0xFF;
195 		val[1] = (u16)ret >> 8;
196 	}
197 	if (ret < 0) {
198 		dev_err(&chip->client->dev, "failed reading register\n");
199 		return ret;
200 	}
201 
202 	return 0;
203 }
204 
205 static int pca953x_gpio_direction_input(struct gpio_chip *gc, unsigned off)
206 {
207 	struct pca953x_chip *chip = to_pca(gc);
208 	u8 reg_val;
209 	int ret, offset = 0;
210 
211 	mutex_lock(&chip->i2c_lock);
212 	reg_val = chip->reg_direction[off / BANK_SZ] | (1u << (off % BANK_SZ));
213 
214 	switch (chip->chip_type) {
215 	case PCA953X_TYPE:
216 		offset = PCA953X_DIRECTION;
217 		break;
218 	case PCA957X_TYPE:
219 		offset = PCA957X_CFG;
220 		break;
221 	}
222 	ret = pca953x_write_single(chip, offset, reg_val, off);
223 	if (ret)
224 		goto exit;
225 
226 	chip->reg_direction[off / BANK_SZ] = reg_val;
227 	ret = 0;
228 exit:
229 	mutex_unlock(&chip->i2c_lock);
230 	return ret;
231 }
232 
233 static int pca953x_gpio_direction_output(struct gpio_chip *gc,
234 		unsigned off, int val)
235 {
236 	struct pca953x_chip *chip = to_pca(gc);
237 	u8 reg_val;
238 	int ret, offset = 0;
239 
240 	mutex_lock(&chip->i2c_lock);
241 	/* set output level */
242 	if (val)
243 		reg_val = chip->reg_output[off / BANK_SZ]
244 			| (1u << (off % BANK_SZ));
245 	else
246 		reg_val = chip->reg_output[off / BANK_SZ]
247 			& ~(1u << (off % BANK_SZ));
248 
249 	switch (chip->chip_type) {
250 	case PCA953X_TYPE:
251 		offset = PCA953X_OUTPUT;
252 		break;
253 	case PCA957X_TYPE:
254 		offset = PCA957X_OUT;
255 		break;
256 	}
257 	ret = pca953x_write_single(chip, offset, reg_val, off);
258 	if (ret)
259 		goto exit;
260 
261 	chip->reg_output[off / BANK_SZ] = reg_val;
262 
263 	/* then direction */
264 	reg_val = chip->reg_direction[off / BANK_SZ] & ~(1u << (off % BANK_SZ));
265 	switch (chip->chip_type) {
266 	case PCA953X_TYPE:
267 		offset = PCA953X_DIRECTION;
268 		break;
269 	case PCA957X_TYPE:
270 		offset = PCA957X_CFG;
271 		break;
272 	}
273 	ret = pca953x_write_single(chip, offset, reg_val, off);
274 	if (ret)
275 		goto exit;
276 
277 	chip->reg_direction[off / BANK_SZ] = reg_val;
278 	ret = 0;
279 exit:
280 	mutex_unlock(&chip->i2c_lock);
281 	return ret;
282 }
283 
284 static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off)
285 {
286 	struct pca953x_chip *chip = to_pca(gc);
287 	u32 reg_val;
288 	int ret, offset = 0;
289 
290 	mutex_lock(&chip->i2c_lock);
291 	switch (chip->chip_type) {
292 	case PCA953X_TYPE:
293 		offset = PCA953X_INPUT;
294 		break;
295 	case PCA957X_TYPE:
296 		offset = PCA957X_IN;
297 		break;
298 	}
299 	ret = pca953x_read_single(chip, offset, &reg_val, off);
300 	mutex_unlock(&chip->i2c_lock);
301 	if (ret < 0) {
302 		/* NOTE:  diagnostic already emitted; that's all we should
303 		 * do unless gpio_*_value_cansleep() calls become different
304 		 * from their nonsleeping siblings (and report faults).
305 		 */
306 		return 0;
307 	}
308 
309 	return (reg_val & (1u << (off % BANK_SZ))) ? 1 : 0;
310 }
311 
312 static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val)
313 {
314 	struct pca953x_chip *chip = to_pca(gc);
315 	u8 reg_val;
316 	int ret, offset = 0;
317 
318 	mutex_lock(&chip->i2c_lock);
319 	if (val)
320 		reg_val = chip->reg_output[off / BANK_SZ]
321 			| (1u << (off % BANK_SZ));
322 	else
323 		reg_val = chip->reg_output[off / BANK_SZ]
324 			& ~(1u << (off % BANK_SZ));
325 
326 	switch (chip->chip_type) {
327 	case PCA953X_TYPE:
328 		offset = PCA953X_OUTPUT;
329 		break;
330 	case PCA957X_TYPE:
331 		offset = PCA957X_OUT;
332 		break;
333 	}
334 	ret = pca953x_write_single(chip, offset, reg_val, off);
335 	if (ret)
336 		goto exit;
337 
338 	chip->reg_output[off / BANK_SZ] = reg_val;
339 exit:
340 	mutex_unlock(&chip->i2c_lock);
341 }
342 
343 static void pca953x_setup_gpio(struct pca953x_chip *chip, int gpios)
344 {
345 	struct gpio_chip *gc;
346 
347 	gc = &chip->gpio_chip;
348 
349 	gc->direction_input  = pca953x_gpio_direction_input;
350 	gc->direction_output = pca953x_gpio_direction_output;
351 	gc->get = pca953x_gpio_get_value;
352 	gc->set = pca953x_gpio_set_value;
353 	gc->can_sleep = true;
354 
355 	gc->base = chip->gpio_start;
356 	gc->ngpio = gpios;
357 	gc->label = chip->client->name;
358 	gc->dev = &chip->client->dev;
359 	gc->owner = THIS_MODULE;
360 	gc->names = chip->names;
361 }
362 
363 #ifdef CONFIG_GPIO_PCA953X_IRQ
364 static void pca953x_irq_mask(struct irq_data *d)
365 {
366 	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
367 	struct pca953x_chip *chip = to_pca(gc);
368 
369 	chip->irq_mask[d->hwirq / BANK_SZ] &= ~(1 << (d->hwirq % BANK_SZ));
370 }
371 
372 static void pca953x_irq_unmask(struct irq_data *d)
373 {
374 	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
375 	struct pca953x_chip *chip = to_pca(gc);
376 
377 	chip->irq_mask[d->hwirq / BANK_SZ] |= 1 << (d->hwirq % BANK_SZ);
378 }
379 
380 static void pca953x_irq_bus_lock(struct irq_data *d)
381 {
382 	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
383 	struct pca953x_chip *chip = to_pca(gc);
384 
385 	mutex_lock(&chip->irq_lock);
386 }
387 
388 static void pca953x_irq_bus_sync_unlock(struct irq_data *d)
389 {
390 	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
391 	struct pca953x_chip *chip = to_pca(gc);
392 	u8 new_irqs;
393 	int level, i;
394 
395 	/* Look for any newly setup interrupt */
396 	for (i = 0; i < NBANK(chip); i++) {
397 		new_irqs = chip->irq_trig_fall[i] | chip->irq_trig_raise[i];
398 		new_irqs &= ~chip->reg_direction[i];
399 
400 		while (new_irqs) {
401 			level = __ffs(new_irqs);
402 			pca953x_gpio_direction_input(&chip->gpio_chip,
403 							level + (BANK_SZ * i));
404 			new_irqs &= ~(1 << level);
405 		}
406 	}
407 
408 	mutex_unlock(&chip->irq_lock);
409 }
410 
411 static int pca953x_irq_set_type(struct irq_data *d, unsigned int type)
412 {
413 	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
414 	struct pca953x_chip *chip = to_pca(gc);
415 	int bank_nb = d->hwirq / BANK_SZ;
416 	u8 mask = 1 << (d->hwirq % BANK_SZ);
417 
418 	if (!(type & IRQ_TYPE_EDGE_BOTH)) {
419 		dev_err(&chip->client->dev, "irq %d: unsupported type %d\n",
420 			d->irq, type);
421 		return -EINVAL;
422 	}
423 
424 	if (type & IRQ_TYPE_EDGE_FALLING)
425 		chip->irq_trig_fall[bank_nb] |= mask;
426 	else
427 		chip->irq_trig_fall[bank_nb] &= ~mask;
428 
429 	if (type & IRQ_TYPE_EDGE_RISING)
430 		chip->irq_trig_raise[bank_nb] |= mask;
431 	else
432 		chip->irq_trig_raise[bank_nb] &= ~mask;
433 
434 	return 0;
435 }
436 
437 static struct irq_chip pca953x_irq_chip = {
438 	.name			= "pca953x",
439 	.irq_mask		= pca953x_irq_mask,
440 	.irq_unmask		= pca953x_irq_unmask,
441 	.irq_bus_lock		= pca953x_irq_bus_lock,
442 	.irq_bus_sync_unlock	= pca953x_irq_bus_sync_unlock,
443 	.irq_set_type		= pca953x_irq_set_type,
444 };
445 
446 static u8 pca953x_irq_pending(struct pca953x_chip *chip, u8 *pending)
447 {
448 	u8 cur_stat[MAX_BANK];
449 	u8 old_stat[MAX_BANK];
450 	u8 pendings = 0;
451 	u8 trigger[MAX_BANK], triggers = 0;
452 	int ret, i, offset = 0;
453 
454 	switch (chip->chip_type) {
455 	case PCA953X_TYPE:
456 		offset = PCA953X_INPUT;
457 		break;
458 	case PCA957X_TYPE:
459 		offset = PCA957X_IN;
460 		break;
461 	}
462 	ret = pca953x_read_regs(chip, offset, cur_stat);
463 	if (ret)
464 		return 0;
465 
466 	/* Remove output pins from the equation */
467 	for (i = 0; i < NBANK(chip); i++)
468 		cur_stat[i] &= chip->reg_direction[i];
469 
470 	memcpy(old_stat, chip->irq_stat, NBANK(chip));
471 
472 	for (i = 0; i < NBANK(chip); i++) {
473 		trigger[i] = (cur_stat[i] ^ old_stat[i]) & chip->irq_mask[i];
474 		triggers += trigger[i];
475 	}
476 
477 	if (!triggers)
478 		return 0;
479 
480 	memcpy(chip->irq_stat, cur_stat, NBANK(chip));
481 
482 	for (i = 0; i < NBANK(chip); i++) {
483 		pending[i] = (old_stat[i] & chip->irq_trig_fall[i]) |
484 			(cur_stat[i] & chip->irq_trig_raise[i]);
485 		pending[i] &= trigger[i];
486 		pendings += pending[i];
487 	}
488 
489 	return pendings;
490 }
491 
492 static irqreturn_t pca953x_irq_handler(int irq, void *devid)
493 {
494 	struct pca953x_chip *chip = devid;
495 	u8 pending[MAX_BANK];
496 	u8 level;
497 	unsigned nhandled = 0;
498 	int i;
499 
500 	if (!pca953x_irq_pending(chip, pending))
501 		return IRQ_NONE;
502 
503 	for (i = 0; i < NBANK(chip); i++) {
504 		while (pending[i]) {
505 			level = __ffs(pending[i]);
506 			handle_nested_irq(irq_find_mapping(chip->gpio_chip.irqdomain,
507 							level + (BANK_SZ * i)));
508 			pending[i] &= ~(1 << level);
509 			nhandled++;
510 		}
511 	}
512 
513 	return (nhandled > 0) ? IRQ_HANDLED : IRQ_NONE;
514 }
515 
516 static int pca953x_irq_setup(struct pca953x_chip *chip,
517 			     const struct i2c_device_id *id,
518 			     int irq_base)
519 {
520 	struct i2c_client *client = chip->client;
521 	int ret, i, offset = 0;
522 
523 	if (irq_base != -1
524 			&& (id->driver_data & PCA_INT)) {
525 
526 		switch (chip->chip_type) {
527 		case PCA953X_TYPE:
528 			offset = PCA953X_INPUT;
529 			break;
530 		case PCA957X_TYPE:
531 			offset = PCA957X_IN;
532 			break;
533 		}
534 		ret = pca953x_read_regs(chip, offset, chip->irq_stat);
535 		if (ret)
536 			return ret;
537 
538 		/*
539 		 * There is no way to know which GPIO line generated the
540 		 * interrupt.  We have to rely on the previous read for
541 		 * this purpose.
542 		 */
543 		for (i = 0; i < NBANK(chip); i++)
544 			chip->irq_stat[i] &= chip->reg_direction[i];
545 		mutex_init(&chip->irq_lock);
546 
547 		ret = devm_request_threaded_irq(&client->dev,
548 					client->irq,
549 					   NULL,
550 					   pca953x_irq_handler,
551 					   IRQF_TRIGGER_LOW | IRQF_ONESHOT |
552 						   IRQF_SHARED,
553 					   dev_name(&client->dev), chip);
554 		if (ret) {
555 			dev_err(&client->dev, "failed to request irq %d\n",
556 				client->irq);
557 			return ret;
558 		}
559 
560 		ret =  gpiochip_irqchip_add(&chip->gpio_chip,
561 					    &pca953x_irq_chip,
562 					    irq_base,
563 					    handle_simple_irq,
564 					    IRQ_TYPE_NONE);
565 		if (ret) {
566 			dev_err(&client->dev,
567 				"could not connect irqchip to gpiochip\n");
568 			return ret;
569 		}
570 	}
571 
572 	return 0;
573 }
574 
575 #else /* CONFIG_GPIO_PCA953X_IRQ */
576 static int pca953x_irq_setup(struct pca953x_chip *chip,
577 			     const struct i2c_device_id *id,
578 			     int irq_base)
579 {
580 	struct i2c_client *client = chip->client;
581 
582 	if (irq_base != -1 && (id->driver_data & PCA_INT))
583 		dev_warn(&client->dev, "interrupt support not compiled in\n");
584 
585 	return 0;
586 }
587 #endif
588 
589 /*
590  * Handlers for alternative sources of platform_data
591  */
592 #ifdef CONFIG_OF_GPIO
593 /*
594  * Translate OpenFirmware node properties into platform_data
595  * WARNING: This is DEPRECATED and will be removed eventually!
596  */
597 static void
598 pca953x_get_alt_pdata(struct i2c_client *client, int *gpio_base, u32 *invert)
599 {
600 	struct device_node *node;
601 	const __be32 *val;
602 	int size;
603 
604 	*gpio_base = -1;
605 
606 	node = client->dev.of_node;
607 	if (node == NULL)
608 		return;
609 
610 	val = of_get_property(node, "linux,gpio-base", &size);
611 	WARN(val, "%s: device-tree property 'linux,gpio-base' is deprecated!", __func__);
612 	if (val) {
613 		if (size != sizeof(*val))
614 			dev_warn(&client->dev, "%s: wrong linux,gpio-base\n",
615 				 node->full_name);
616 		else
617 			*gpio_base = be32_to_cpup(val);
618 	}
619 
620 	val = of_get_property(node, "polarity", NULL);
621 	WARN(val, "%s: device-tree property 'polarity' is deprecated!", __func__);
622 	if (val)
623 		*invert = *val;
624 }
625 #else
626 static void
627 pca953x_get_alt_pdata(struct i2c_client *client, int *gpio_base, u32 *invert)
628 {
629 	*gpio_base = -1;
630 }
631 #endif
632 
633 static int device_pca953x_init(struct pca953x_chip *chip, u32 invert)
634 {
635 	int ret;
636 	u8 val[MAX_BANK];
637 
638 	ret = pca953x_read_regs(chip, PCA953X_OUTPUT, chip->reg_output);
639 	if (ret)
640 		goto out;
641 
642 	ret = pca953x_read_regs(chip, PCA953X_DIRECTION,
643 			       chip->reg_direction);
644 	if (ret)
645 		goto out;
646 
647 	/* set platform specific polarity inversion */
648 	if (invert)
649 		memset(val, 0xFF, NBANK(chip));
650 	else
651 		memset(val, 0, NBANK(chip));
652 
653 	ret = pca953x_write_regs(chip, PCA953X_INVERT, val);
654 out:
655 	return ret;
656 }
657 
658 static int device_pca957x_init(struct pca953x_chip *chip, u32 invert)
659 {
660 	int ret;
661 	u8 val[MAX_BANK];
662 
663 	ret = pca953x_read_regs(chip, PCA957X_OUT, chip->reg_output);
664 	if (ret)
665 		goto out;
666 	ret = pca953x_read_regs(chip, PCA957X_CFG, chip->reg_direction);
667 	if (ret)
668 		goto out;
669 
670 	/* set platform specific polarity inversion */
671 	if (invert)
672 		memset(val, 0xFF, NBANK(chip));
673 	else
674 		memset(val, 0, NBANK(chip));
675 	pca953x_write_regs(chip, PCA957X_INVRT, val);
676 
677 	/* To enable register 6, 7 to controll pull up and pull down */
678 	memset(val, 0x02, NBANK(chip));
679 	pca953x_write_regs(chip, PCA957X_BKEN, val);
680 
681 	return 0;
682 out:
683 	return ret;
684 }
685 
686 static int pca953x_probe(struct i2c_client *client,
687 				   const struct i2c_device_id *id)
688 {
689 	struct pca953x_platform_data *pdata;
690 	struct pca953x_chip *chip;
691 	int irq_base = 0;
692 	int ret;
693 	u32 invert = 0;
694 
695 	chip = devm_kzalloc(&client->dev,
696 			sizeof(struct pca953x_chip), GFP_KERNEL);
697 	if (chip == NULL)
698 		return -ENOMEM;
699 
700 	pdata = dev_get_platdata(&client->dev);
701 	if (pdata) {
702 		irq_base = pdata->irq_base;
703 		chip->gpio_start = pdata->gpio_base;
704 		invert = pdata->invert;
705 		chip->names = pdata->names;
706 	} else {
707 		pca953x_get_alt_pdata(client, &chip->gpio_start, &invert);
708 #ifdef CONFIG_OF_GPIO
709 		/* If I2C node has no interrupts property, disable GPIO interrupts */
710 		if (of_find_property(client->dev.of_node, "interrupts", NULL) == NULL)
711 			irq_base = -1;
712 #endif
713 	}
714 
715 	chip->client = client;
716 
717 	chip->chip_type = id->driver_data & (PCA953X_TYPE | PCA957X_TYPE);
718 
719 	mutex_init(&chip->i2c_lock);
720 
721 	/* initialize cached registers from their original values.
722 	 * we can't share this chip with another i2c master.
723 	 */
724 	pca953x_setup_gpio(chip, id->driver_data & PCA_GPIO_MASK);
725 
726 	if (chip->chip_type == PCA953X_TYPE)
727 		ret = device_pca953x_init(chip, invert);
728 	else
729 		ret = device_pca957x_init(chip, invert);
730 	if (ret)
731 		return ret;
732 
733 	ret = gpiochip_add(&chip->gpio_chip);
734 	if (ret)
735 		return ret;
736 
737 	ret = pca953x_irq_setup(chip, id, irq_base);
738 	if (ret)
739 		return ret;
740 
741 	if (pdata && pdata->setup) {
742 		ret = pdata->setup(client, chip->gpio_chip.base,
743 				chip->gpio_chip.ngpio, pdata->context);
744 		if (ret < 0)
745 			dev_warn(&client->dev, "setup failed, %d\n", ret);
746 	}
747 
748 	i2c_set_clientdata(client, chip);
749 	return 0;
750 }
751 
752 static int pca953x_remove(struct i2c_client *client)
753 {
754 	struct pca953x_platform_data *pdata = dev_get_platdata(&client->dev);
755 	struct pca953x_chip *chip = i2c_get_clientdata(client);
756 	int ret = 0;
757 
758 	if (pdata && pdata->teardown) {
759 		ret = pdata->teardown(client, chip->gpio_chip.base,
760 				chip->gpio_chip.ngpio, pdata->context);
761 		if (ret < 0) {
762 			dev_err(&client->dev, "%s failed, %d\n",
763 					"teardown", ret);
764 			return ret;
765 		}
766 	}
767 
768 	ret = gpiochip_remove(&chip->gpio_chip);
769 	if (ret) {
770 		dev_err(&client->dev, "%s failed, %d\n",
771 				"gpiochip_remove()", ret);
772 		return ret;
773 	}
774 
775 	return 0;
776 }
777 
778 static const struct of_device_id pca953x_dt_ids[] = {
779 	{ .compatible = "nxp,pca9505", },
780 	{ .compatible = "nxp,pca9534", },
781 	{ .compatible = "nxp,pca9535", },
782 	{ .compatible = "nxp,pca9536", },
783 	{ .compatible = "nxp,pca9537", },
784 	{ .compatible = "nxp,pca9538", },
785 	{ .compatible = "nxp,pca9539", },
786 	{ .compatible = "nxp,pca9554", },
787 	{ .compatible = "nxp,pca9555", },
788 	{ .compatible = "nxp,pca9556", },
789 	{ .compatible = "nxp,pca9557", },
790 	{ .compatible = "nxp,pca9574", },
791 	{ .compatible = "nxp,pca9575", },
792 	{ .compatible = "nxp,pca9698", },
793 
794 	{ .compatible = "maxim,max7310", },
795 	{ .compatible = "maxim,max7312", },
796 	{ .compatible = "maxim,max7313", },
797 	{ .compatible = "maxim,max7315", },
798 
799 	{ .compatible = "ti,pca6107", },
800 	{ .compatible = "ti,tca6408", },
801 	{ .compatible = "ti,tca6416", },
802 	{ .compatible = "ti,tca6424", },
803 
804 	{ .compatible = "exar,xra1202", },
805 	{ }
806 };
807 
808 MODULE_DEVICE_TABLE(of, pca953x_dt_ids);
809 
810 static struct i2c_driver pca953x_driver = {
811 	.driver = {
812 		.name	= "pca953x",
813 		.of_match_table = pca953x_dt_ids,
814 	},
815 	.probe		= pca953x_probe,
816 	.remove		= pca953x_remove,
817 	.id_table	= pca953x_id,
818 };
819 
820 static int __init pca953x_init(void)
821 {
822 	return i2c_add_driver(&pca953x_driver);
823 }
824 /* register after i2c postcore initcall and before
825  * subsys initcalls that may rely on these GPIOs
826  */
827 subsys_initcall(pca953x_init);
828 
829 static void __exit pca953x_exit(void)
830 {
831 	i2c_del_driver(&pca953x_driver);
832 }
833 module_exit(pca953x_exit);
834 
835 MODULE_AUTHOR("eric miao <eric.miao@marvell.com>");
836 MODULE_DESCRIPTION("GPIO expander driver for PCA953x");
837 MODULE_LICENSE("GPL");
838