Version:  2.0.40 2.2.26 2.4.37 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17

Linux/drivers/gpio/gpio-pca953x.c

  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         gpiochip_remove(&chip->gpio_chip);
769 
770         return 0;
771 }
772 
773 static const struct of_device_id pca953x_dt_ids[] = {
774         { .compatible = "nxp,pca9505", },
775         { .compatible = "nxp,pca9534", },
776         { .compatible = "nxp,pca9535", },
777         { .compatible = "nxp,pca9536", },
778         { .compatible = "nxp,pca9537", },
779         { .compatible = "nxp,pca9538", },
780         { .compatible = "nxp,pca9539", },
781         { .compatible = "nxp,pca9554", },
782         { .compatible = "nxp,pca9555", },
783         { .compatible = "nxp,pca9556", },
784         { .compatible = "nxp,pca9557", },
785         { .compatible = "nxp,pca9574", },
786         { .compatible = "nxp,pca9575", },
787         { .compatible = "nxp,pca9698", },
788 
789         { .compatible = "maxim,max7310", },
790         { .compatible = "maxim,max7312", },
791         { .compatible = "maxim,max7313", },
792         { .compatible = "maxim,max7315", },
793 
794         { .compatible = "ti,pca6107", },
795         { .compatible = "ti,tca6408", },
796         { .compatible = "ti,tca6416", },
797         { .compatible = "ti,tca6424", },
798 
799         { .compatible = "exar,xra1202", },
800         { }
801 };
802 
803 MODULE_DEVICE_TABLE(of, pca953x_dt_ids);
804 
805 static struct i2c_driver pca953x_driver = {
806         .driver = {
807                 .name   = "pca953x",
808                 .of_match_table = pca953x_dt_ids,
809         },
810         .probe          = pca953x_probe,
811         .remove         = pca953x_remove,
812         .id_table       = pca953x_id,
813 };
814 
815 static int __init pca953x_init(void)
816 {
817         return i2c_add_driver(&pca953x_driver);
818 }
819 /* register after i2c postcore initcall and before
820  * subsys initcalls that may rely on these GPIOs
821  */
822 subsys_initcall(pca953x_init);
823 
824 static void __exit pca953x_exit(void)
825 {
826         i2c_del_driver(&pca953x_driver);
827 }
828 module_exit(pca953x_exit);
829 
830 MODULE_AUTHOR("eric miao <eric.miao@marvell.com>");
831 MODULE_DESCRIPTION("GPIO expander driver for PCA953x");
832 MODULE_LICENSE("GPL");
833 

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