Version:  2.0.40 2.2.26 2.4.37 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5

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 #include <linux/of_platform.h>
 22 #include <linux/acpi.h>
 23 
 24 #define PCA953X_INPUT           0
 25 #define PCA953X_OUTPUT          1
 26 #define PCA953X_INVERT          2
 27 #define PCA953X_DIRECTION       3
 28 
 29 #define REG_ADDR_AI             0x80
 30 
 31 #define PCA957X_IN              0
 32 #define PCA957X_INVRT           1
 33 #define PCA957X_BKEN            2
 34 #define PCA957X_PUPD            3
 35 #define PCA957X_CFG             4
 36 #define PCA957X_OUT             5
 37 #define PCA957X_MSK             6
 38 #define PCA957X_INTS            7
 39 
 40 #define PCA_GPIO_MASK           0x00FF
 41 #define PCA_INT                 0x0100
 42 #define PCA953X_TYPE            0x1000
 43 #define PCA957X_TYPE            0x2000
 44 #define PCA_TYPE_MASK           0xF000
 45 
 46 #define PCA_CHIP_TYPE(x)        ((x) & PCA_TYPE_MASK)
 47 
 48 static const struct i2c_device_id pca953x_id[] = {
 49         { "pca9505", 40 | PCA953X_TYPE | PCA_INT, },
 50         { "pca9534", 8  | PCA953X_TYPE | PCA_INT, },
 51         { "pca9535", 16 | PCA953X_TYPE | PCA_INT, },
 52         { "pca9536", 4  | PCA953X_TYPE, },
 53         { "pca9537", 4  | PCA953X_TYPE | PCA_INT, },
 54         { "pca9538", 8  | PCA953X_TYPE | PCA_INT, },
 55         { "pca9539", 16 | PCA953X_TYPE | PCA_INT, },
 56         { "pca9554", 8  | PCA953X_TYPE | PCA_INT, },
 57         { "pca9555", 16 | PCA953X_TYPE | PCA_INT, },
 58         { "pca9556", 8  | PCA953X_TYPE, },
 59         { "pca9557", 8  | PCA953X_TYPE, },
 60         { "pca9574", 8  | PCA957X_TYPE | PCA_INT, },
 61         { "pca9575", 16 | PCA957X_TYPE | PCA_INT, },
 62         { "pca9698", 40 | PCA953X_TYPE, },
 63 
 64         { "max7310", 8  | PCA953X_TYPE, },
 65         { "max7312", 16 | PCA953X_TYPE | PCA_INT, },
 66         { "max7313", 16 | PCA953X_TYPE | PCA_INT, },
 67         { "max7315", 8  | PCA953X_TYPE | PCA_INT, },
 68         { "pca6107", 8  | PCA953X_TYPE | PCA_INT, },
 69         { "tca6408", 8  | PCA953X_TYPE | PCA_INT, },
 70         { "tca6416", 16 | PCA953X_TYPE | PCA_INT, },
 71         { "tca6424", 24 | PCA953X_TYPE | PCA_INT, },
 72         { "tca9539", 16 | PCA953X_TYPE | PCA_INT, },
 73         { "xra1202", 8  | PCA953X_TYPE },
 74         { }
 75 };
 76 MODULE_DEVICE_TABLE(i2c, pca953x_id);
 77 
 78 static const struct acpi_device_id pca953x_acpi_ids[] = {
 79         { "INT3491", 16 | PCA953X_TYPE | PCA_INT, },
 80         { }
 81 };
 82 MODULE_DEVICE_TABLE(acpi, pca953x_acpi_ids);
 83 
 84 #define MAX_BANK 5
 85 #define BANK_SZ 8
 86 
 87 #define NBANK(chip) (chip->gpio_chip.ngpio / BANK_SZ)
 88 
 89 struct pca953x_chip {
 90         unsigned gpio_start;
 91         u8 reg_output[MAX_BANK];
 92         u8 reg_direction[MAX_BANK];
 93         struct mutex i2c_lock;
 94 
 95 #ifdef CONFIG_GPIO_PCA953X_IRQ
 96         struct mutex irq_lock;
 97         u8 irq_mask[MAX_BANK];
 98         u8 irq_stat[MAX_BANK];
 99         u8 irq_trig_raise[MAX_BANK];
100         u8 irq_trig_fall[MAX_BANK];
101 #endif
102 
103         struct i2c_client *client;
104         struct gpio_chip gpio_chip;
105         const char *const *names;
106         int     chip_type;
107         unsigned long driver_data;
108 };
109 
110 static int pca953x_read_single(struct pca953x_chip *chip, int reg, u32 *val,
111                                 int off)
112 {
113         int ret;
114         int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
115         int offset = off / BANK_SZ;
116 
117         ret = i2c_smbus_read_byte_data(chip->client,
118                                 (reg << bank_shift) + offset);
119         *val = ret;
120 
121         if (ret < 0) {
122                 dev_err(&chip->client->dev, "failed reading register\n");
123                 return ret;
124         }
125 
126         return 0;
127 }
128 
129 static int pca953x_write_single(struct pca953x_chip *chip, int reg, u32 val,
130                                 int off)
131 {
132         int ret = 0;
133         int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
134         int offset = off / BANK_SZ;
135 
136         ret = i2c_smbus_write_byte_data(chip->client,
137                                         (reg << bank_shift) + offset, val);
138 
139         if (ret < 0) {
140                 dev_err(&chip->client->dev, "failed writing register\n");
141                 return ret;
142         }
143 
144         return 0;
145 }
146 
147 static int pca953x_write_regs(struct pca953x_chip *chip, int reg, u8 *val)
148 {
149         int ret = 0;
150 
151         if (chip->gpio_chip.ngpio <= 8)
152                 ret = i2c_smbus_write_byte_data(chip->client, reg, *val);
153         else if (chip->gpio_chip.ngpio >= 24) {
154                 int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
155                 ret = i2c_smbus_write_i2c_block_data(chip->client,
156                                         (reg << bank_shift) | REG_ADDR_AI,
157                                         NBANK(chip), val);
158         } else {
159                 switch (chip->chip_type) {
160                 case PCA953X_TYPE:
161                         ret = i2c_smbus_write_word_data(chip->client,
162                                                         reg << 1, (u16) *val);
163                         break;
164                 case PCA957X_TYPE:
165                         ret = i2c_smbus_write_byte_data(chip->client, reg << 1,
166                                                         val[0]);
167                         if (ret < 0)
168                                 break;
169                         ret = i2c_smbus_write_byte_data(chip->client,
170                                                         (reg << 1) + 1,
171                                                         val[1]);
172                         break;
173                 }
174         }
175 
176         if (ret < 0) {
177                 dev_err(&chip->client->dev, "failed writing register\n");
178                 return ret;
179         }
180 
181         return 0;
182 }
183 
184 static int pca953x_read_regs(struct pca953x_chip *chip, int reg, u8 *val)
185 {
186         int ret;
187 
188         if (chip->gpio_chip.ngpio <= 8) {
189                 ret = i2c_smbus_read_byte_data(chip->client, reg);
190                 *val = ret;
191         } else if (chip->gpio_chip.ngpio >= 24) {
192                 int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
193 
194                 ret = i2c_smbus_read_i2c_block_data(chip->client,
195                                         (reg << bank_shift) | REG_ADDR_AI,
196                                         NBANK(chip), val);
197         } else {
198                 ret = i2c_smbus_read_word_data(chip->client, reg << 1);
199                 val[0] = (u16)ret & 0xFF;
200                 val[1] = (u16)ret >> 8;
201         }
202         if (ret < 0) {
203                 dev_err(&chip->client->dev, "failed reading register\n");
204                 return ret;
205         }
206 
207         return 0;
208 }
209 
210 static int pca953x_gpio_direction_input(struct gpio_chip *gc, unsigned off)
211 {
212         struct pca953x_chip *chip = gpiochip_get_data(gc);
213         u8 reg_val;
214         int ret, offset = 0;
215 
216         mutex_lock(&chip->i2c_lock);
217         reg_val = chip->reg_direction[off / BANK_SZ] | (1u << (off % BANK_SZ));
218 
219         switch (chip->chip_type) {
220         case PCA953X_TYPE:
221                 offset = PCA953X_DIRECTION;
222                 break;
223         case PCA957X_TYPE:
224                 offset = PCA957X_CFG;
225                 break;
226         }
227         ret = pca953x_write_single(chip, offset, reg_val, off);
228         if (ret)
229                 goto exit;
230 
231         chip->reg_direction[off / BANK_SZ] = reg_val;
232         ret = 0;
233 exit:
234         mutex_unlock(&chip->i2c_lock);
235         return ret;
236 }
237 
238 static int pca953x_gpio_direction_output(struct gpio_chip *gc,
239                 unsigned off, int val)
240 {
241         struct pca953x_chip *chip = gpiochip_get_data(gc);
242         u8 reg_val;
243         int ret, offset = 0;
244 
245         mutex_lock(&chip->i2c_lock);
246         /* set output level */
247         if (val)
248                 reg_val = chip->reg_output[off / BANK_SZ]
249                         | (1u << (off % BANK_SZ));
250         else
251                 reg_val = chip->reg_output[off / BANK_SZ]
252                         & ~(1u << (off % BANK_SZ));
253 
254         switch (chip->chip_type) {
255         case PCA953X_TYPE:
256                 offset = PCA953X_OUTPUT;
257                 break;
258         case PCA957X_TYPE:
259                 offset = PCA957X_OUT;
260                 break;
261         }
262         ret = pca953x_write_single(chip, offset, reg_val, off);
263         if (ret)
264                 goto exit;
265 
266         chip->reg_output[off / BANK_SZ] = reg_val;
267 
268         /* then direction */
269         reg_val = chip->reg_direction[off / BANK_SZ] & ~(1u << (off % BANK_SZ));
270         switch (chip->chip_type) {
271         case PCA953X_TYPE:
272                 offset = PCA953X_DIRECTION;
273                 break;
274         case PCA957X_TYPE:
275                 offset = PCA957X_CFG;
276                 break;
277         }
278         ret = pca953x_write_single(chip, offset, reg_val, off);
279         if (ret)
280                 goto exit;
281 
282         chip->reg_direction[off / BANK_SZ] = reg_val;
283         ret = 0;
284 exit:
285         mutex_unlock(&chip->i2c_lock);
286         return ret;
287 }
288 
289 static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off)
290 {
291         struct pca953x_chip *chip = gpiochip_get_data(gc);
292         u32 reg_val;
293         int ret, offset = 0;
294 
295         mutex_lock(&chip->i2c_lock);
296         switch (chip->chip_type) {
297         case PCA953X_TYPE:
298                 offset = PCA953X_INPUT;
299                 break;
300         case PCA957X_TYPE:
301                 offset = PCA957X_IN;
302                 break;
303         }
304         ret = pca953x_read_single(chip, offset, &reg_val, off);
305         mutex_unlock(&chip->i2c_lock);
306         if (ret < 0) {
307                 /* NOTE:  diagnostic already emitted; that's all we should
308                  * do unless gpio_*_value_cansleep() calls become different
309                  * from their nonsleeping siblings (and report faults).
310                  */
311                 return 0;
312         }
313 
314         return (reg_val & (1u << (off % BANK_SZ))) ? 1 : 0;
315 }
316 
317 static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val)
318 {
319         struct pca953x_chip *chip = gpiochip_get_data(gc);
320         u8 reg_val;
321         int ret, offset = 0;
322 
323         mutex_lock(&chip->i2c_lock);
324         if (val)
325                 reg_val = chip->reg_output[off / BANK_SZ]
326                         | (1u << (off % BANK_SZ));
327         else
328                 reg_val = chip->reg_output[off / BANK_SZ]
329                         & ~(1u << (off % BANK_SZ));
330 
331         switch (chip->chip_type) {
332         case PCA953X_TYPE:
333                 offset = PCA953X_OUTPUT;
334                 break;
335         case PCA957X_TYPE:
336                 offset = PCA957X_OUT;
337                 break;
338         }
339         ret = pca953x_write_single(chip, offset, reg_val, off);
340         if (ret)
341                 goto exit;
342 
343         chip->reg_output[off / BANK_SZ] = reg_val;
344 exit:
345         mutex_unlock(&chip->i2c_lock);
346 }
347 
348 
349 static void pca953x_gpio_set_multiple(struct gpio_chip *gc,
350                 unsigned long *mask, unsigned long *bits)
351 {
352         struct pca953x_chip *chip = gpiochip_get_data(gc);
353         u8 reg_val[MAX_BANK];
354         int ret, offset = 0;
355         int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
356         int bank;
357 
358         switch (chip->chip_type) {
359         case PCA953X_TYPE:
360                 offset = PCA953X_OUTPUT;
361                 break;
362         case PCA957X_TYPE:
363                 offset = PCA957X_OUT;
364                 break;
365         }
366 
367         memcpy(reg_val, chip->reg_output, NBANK(chip));
368         mutex_lock(&chip->i2c_lock);
369         for(bank=0; bank<NBANK(chip); bank++) {
370                 unsigned bankmask = mask[bank/4] >> ((bank % 4) * 8);
371                 if(bankmask) {
372                         unsigned bankval  = bits[bank/4] >> ((bank % 4) * 8);
373                         reg_val[bank] = (reg_val[bank] & ~bankmask) | bankval;
374                 }
375         }
376         ret = i2c_smbus_write_i2c_block_data(chip->client, offset << bank_shift, NBANK(chip), reg_val);
377         if (ret)
378                 goto exit;
379 
380         memcpy(chip->reg_output, reg_val, NBANK(chip));
381 exit:
382         mutex_unlock(&chip->i2c_lock);
383 }
384 
385 static void pca953x_setup_gpio(struct pca953x_chip *chip, int gpios)
386 {
387         struct gpio_chip *gc;
388 
389         gc = &chip->gpio_chip;
390 
391         gc->direction_input  = pca953x_gpio_direction_input;
392         gc->direction_output = pca953x_gpio_direction_output;
393         gc->get = pca953x_gpio_get_value;
394         gc->set = pca953x_gpio_set_value;
395         gc->set_multiple = pca953x_gpio_set_multiple;
396         gc->can_sleep = true;
397 
398         gc->base = chip->gpio_start;
399         gc->ngpio = gpios;
400         gc->label = chip->client->name;
401         gc->parent = &chip->client->dev;
402         gc->owner = THIS_MODULE;
403         gc->names = chip->names;
404 }
405 
406 #ifdef CONFIG_GPIO_PCA953X_IRQ
407 static void pca953x_irq_mask(struct irq_data *d)
408 {
409         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
410         struct pca953x_chip *chip = gpiochip_get_data(gc);
411 
412         chip->irq_mask[d->hwirq / BANK_SZ] &= ~(1 << (d->hwirq % BANK_SZ));
413 }
414 
415 static void pca953x_irq_unmask(struct irq_data *d)
416 {
417         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
418         struct pca953x_chip *chip = gpiochip_get_data(gc);
419 
420         chip->irq_mask[d->hwirq / BANK_SZ] |= 1 << (d->hwirq % BANK_SZ);
421 }
422 
423 static void pca953x_irq_bus_lock(struct irq_data *d)
424 {
425         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
426         struct pca953x_chip *chip = gpiochip_get_data(gc);
427 
428         mutex_lock(&chip->irq_lock);
429 }
430 
431 static void pca953x_irq_bus_sync_unlock(struct irq_data *d)
432 {
433         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
434         struct pca953x_chip *chip = gpiochip_get_data(gc);
435         u8 new_irqs;
436         int level, i;
437 
438         /* Look for any newly setup interrupt */
439         for (i = 0; i < NBANK(chip); i++) {
440                 new_irqs = chip->irq_trig_fall[i] | chip->irq_trig_raise[i];
441                 new_irqs &= ~chip->reg_direction[i];
442 
443                 while (new_irqs) {
444                         level = __ffs(new_irqs);
445                         pca953x_gpio_direction_input(&chip->gpio_chip,
446                                                         level + (BANK_SZ * i));
447                         new_irqs &= ~(1 << level);
448                 }
449         }
450 
451         mutex_unlock(&chip->irq_lock);
452 }
453 
454 static int pca953x_irq_set_type(struct irq_data *d, unsigned int type)
455 {
456         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
457         struct pca953x_chip *chip = gpiochip_get_data(gc);
458         int bank_nb = d->hwirq / BANK_SZ;
459         u8 mask = 1 << (d->hwirq % BANK_SZ);
460 
461         if (!(type & IRQ_TYPE_EDGE_BOTH)) {
462                 dev_err(&chip->client->dev, "irq %d: unsupported type %d\n",
463                         d->irq, type);
464                 return -EINVAL;
465         }
466 
467         if (type & IRQ_TYPE_EDGE_FALLING)
468                 chip->irq_trig_fall[bank_nb] |= mask;
469         else
470                 chip->irq_trig_fall[bank_nb] &= ~mask;
471 
472         if (type & IRQ_TYPE_EDGE_RISING)
473                 chip->irq_trig_raise[bank_nb] |= mask;
474         else
475                 chip->irq_trig_raise[bank_nb] &= ~mask;
476 
477         return 0;
478 }
479 
480 static struct irq_chip pca953x_irq_chip = {
481         .name                   = "pca953x",
482         .irq_mask               = pca953x_irq_mask,
483         .irq_unmask             = pca953x_irq_unmask,
484         .irq_bus_lock           = pca953x_irq_bus_lock,
485         .irq_bus_sync_unlock    = pca953x_irq_bus_sync_unlock,
486         .irq_set_type           = pca953x_irq_set_type,
487 };
488 
489 static bool pca953x_irq_pending(struct pca953x_chip *chip, u8 *pending)
490 {
491         u8 cur_stat[MAX_BANK];
492         u8 old_stat[MAX_BANK];
493         bool pending_seen = false;
494         bool trigger_seen = false;
495         u8 trigger[MAX_BANK];
496         int ret, i, offset = 0;
497 
498         switch (chip->chip_type) {
499         case PCA953X_TYPE:
500                 offset = PCA953X_INPUT;
501                 break;
502         case PCA957X_TYPE:
503                 offset = PCA957X_IN;
504                 break;
505         }
506         ret = pca953x_read_regs(chip, offset, cur_stat);
507         if (ret)
508                 return false;
509 
510         /* Remove output pins from the equation */
511         for (i = 0; i < NBANK(chip); i++)
512                 cur_stat[i] &= chip->reg_direction[i];
513 
514         memcpy(old_stat, chip->irq_stat, NBANK(chip));
515 
516         for (i = 0; i < NBANK(chip); i++) {
517                 trigger[i] = (cur_stat[i] ^ old_stat[i]) & chip->irq_mask[i];
518                 if (trigger[i])
519                         trigger_seen = true;
520         }
521 
522         if (!trigger_seen)
523                 return false;
524 
525         memcpy(chip->irq_stat, cur_stat, NBANK(chip));
526 
527         for (i = 0; i < NBANK(chip); i++) {
528                 pending[i] = (old_stat[i] & chip->irq_trig_fall[i]) |
529                         (cur_stat[i] & chip->irq_trig_raise[i]);
530                 pending[i] &= trigger[i];
531                 if (pending[i])
532                         pending_seen = true;
533         }
534 
535         return pending_seen;
536 }
537 
538 static irqreturn_t pca953x_irq_handler(int irq, void *devid)
539 {
540         struct pca953x_chip *chip = devid;
541         u8 pending[MAX_BANK];
542         u8 level;
543         unsigned nhandled = 0;
544         int i;
545 
546         if (!pca953x_irq_pending(chip, pending))
547                 return IRQ_NONE;
548 
549         for (i = 0; i < NBANK(chip); i++) {
550                 while (pending[i]) {
551                         level = __ffs(pending[i]);
552                         handle_nested_irq(irq_find_mapping(chip->gpio_chip.irqdomain,
553                                                         level + (BANK_SZ * i)));
554                         pending[i] &= ~(1 << level);
555                         nhandled++;
556                 }
557         }
558 
559         return (nhandled > 0) ? IRQ_HANDLED : IRQ_NONE;
560 }
561 
562 static int pca953x_irq_setup(struct pca953x_chip *chip,
563                              int irq_base)
564 {
565         struct i2c_client *client = chip->client;
566         int ret, i, offset = 0;
567 
568         if (client->irq && irq_base != -1
569                         && (chip->driver_data & PCA_INT)) {
570 
571                 switch (chip->chip_type) {
572                 case PCA953X_TYPE:
573                         offset = PCA953X_INPUT;
574                         break;
575                 case PCA957X_TYPE:
576                         offset = PCA957X_IN;
577                         break;
578                 }
579                 ret = pca953x_read_regs(chip, offset, chip->irq_stat);
580                 if (ret)
581                         return ret;
582 
583                 /*
584                  * There is no way to know which GPIO line generated the
585                  * interrupt.  We have to rely on the previous read for
586                  * this purpose.
587                  */
588                 for (i = 0; i < NBANK(chip); i++)
589                         chip->irq_stat[i] &= chip->reg_direction[i];
590                 mutex_init(&chip->irq_lock);
591 
592                 ret = devm_request_threaded_irq(&client->dev,
593                                         client->irq,
594                                            NULL,
595                                            pca953x_irq_handler,
596                                            IRQF_TRIGGER_LOW | IRQF_ONESHOT |
597                                                    IRQF_SHARED,
598                                            dev_name(&client->dev), chip);
599                 if (ret) {
600                         dev_err(&client->dev, "failed to request irq %d\n",
601                                 client->irq);
602                         return ret;
603                 }
604 
605                 ret =  gpiochip_irqchip_add(&chip->gpio_chip,
606                                             &pca953x_irq_chip,
607                                             irq_base,
608                                             handle_simple_irq,
609                                             IRQ_TYPE_NONE);
610                 if (ret) {
611                         dev_err(&client->dev,
612                                 "could not connect irqchip to gpiochip\n");
613                         return ret;
614                 }
615 
616                 gpiochip_set_chained_irqchip(&chip->gpio_chip,
617                                              &pca953x_irq_chip,
618                                              client->irq, NULL);
619         }
620 
621         return 0;
622 }
623 
624 #else /* CONFIG_GPIO_PCA953X_IRQ */
625 static int pca953x_irq_setup(struct pca953x_chip *chip,
626                              int irq_base)
627 {
628         struct i2c_client *client = chip->client;
629 
630         if (irq_base != -1 && (chip->driver_data & PCA_INT))
631                 dev_warn(&client->dev, "interrupt support not compiled in\n");
632 
633         return 0;
634 }
635 #endif
636 
637 static int device_pca953x_init(struct pca953x_chip *chip, u32 invert)
638 {
639         int ret;
640         u8 val[MAX_BANK];
641 
642         ret = pca953x_read_regs(chip, PCA953X_OUTPUT, chip->reg_output);
643         if (ret)
644                 goto out;
645 
646         ret = pca953x_read_regs(chip, PCA953X_DIRECTION,
647                                chip->reg_direction);
648         if (ret)
649                 goto out;
650 
651         /* set platform specific polarity inversion */
652         if (invert)
653                 memset(val, 0xFF, NBANK(chip));
654         else
655                 memset(val, 0, NBANK(chip));
656 
657         ret = pca953x_write_regs(chip, PCA953X_INVERT, val);
658 out:
659         return ret;
660 }
661 
662 static int device_pca957x_init(struct pca953x_chip *chip, u32 invert)
663 {
664         int ret;
665         u8 val[MAX_BANK];
666 
667         ret = pca953x_read_regs(chip, PCA957X_OUT, chip->reg_output);
668         if (ret)
669                 goto out;
670         ret = pca953x_read_regs(chip, PCA957X_CFG, chip->reg_direction);
671         if (ret)
672                 goto out;
673 
674         /* set platform specific polarity inversion */
675         if (invert)
676                 memset(val, 0xFF, NBANK(chip));
677         else
678                 memset(val, 0, NBANK(chip));
679         ret = pca953x_write_regs(chip, PCA957X_INVRT, val);
680         if (ret)
681                 goto out;
682 
683         /* To enable register 6, 7 to control pull up and pull down */
684         memset(val, 0x02, NBANK(chip));
685         ret = pca953x_write_regs(chip, PCA957X_BKEN, val);
686         if (ret)
687                 goto out;
688 
689         return 0;
690 out:
691         return ret;
692 }
693 
694 static const struct of_device_id pca953x_dt_ids[];
695 
696 static int pca953x_probe(struct i2c_client *client,
697                                    const struct i2c_device_id *id)
698 {
699         struct pca953x_platform_data *pdata;
700         struct pca953x_chip *chip;
701         int irq_base = 0;
702         int ret;
703         u32 invert = 0;
704 
705         chip = devm_kzalloc(&client->dev,
706                         sizeof(struct pca953x_chip), GFP_KERNEL);
707         if (chip == NULL)
708                 return -ENOMEM;
709 
710         pdata = dev_get_platdata(&client->dev);
711         if (pdata) {
712                 irq_base = pdata->irq_base;
713                 chip->gpio_start = pdata->gpio_base;
714                 invert = pdata->invert;
715                 chip->names = pdata->names;
716         } else {
717                 chip->gpio_start = -1;
718                 irq_base = 0;
719         }
720 
721         chip->client = client;
722 
723         if (id) {
724                 chip->driver_data = id->driver_data;
725         } else {
726                 const struct acpi_device_id *id;
727                 const struct of_device_id *match;
728 
729                 match = of_match_device(pca953x_dt_ids, &client->dev);
730                 if (match) {
731                         chip->driver_data = (int)(uintptr_t)match->data;
732                 } else {
733                         id = acpi_match_device(pca953x_acpi_ids, &client->dev);
734                         if (!id)
735                                 return -ENODEV;
736 
737                         chip->driver_data = id->driver_data;
738                 }
739         }
740 
741         chip->chip_type = PCA_CHIP_TYPE(chip->driver_data);
742 
743         mutex_init(&chip->i2c_lock);
744 
745         /* initialize cached registers from their original values.
746          * we can't share this chip with another i2c master.
747          */
748         pca953x_setup_gpio(chip, chip->driver_data & PCA_GPIO_MASK);
749 
750         if (chip->chip_type == PCA953X_TYPE)
751                 ret = device_pca953x_init(chip, invert);
752         else
753                 ret = device_pca957x_init(chip, invert);
754         if (ret)
755                 return ret;
756 
757         ret = gpiochip_add_data(&chip->gpio_chip, chip);
758         if (ret)
759                 return ret;
760 
761         ret = pca953x_irq_setup(chip, irq_base);
762         if (ret)
763                 return ret;
764 
765         if (pdata && pdata->setup) {
766                 ret = pdata->setup(client, chip->gpio_chip.base,
767                                 chip->gpio_chip.ngpio, pdata->context);
768                 if (ret < 0)
769                         dev_warn(&client->dev, "setup failed, %d\n", ret);
770         }
771 
772         i2c_set_clientdata(client, chip);
773         return 0;
774 }
775 
776 static int pca953x_remove(struct i2c_client *client)
777 {
778         struct pca953x_platform_data *pdata = dev_get_platdata(&client->dev);
779         struct pca953x_chip *chip = i2c_get_clientdata(client);
780         int ret = 0;
781 
782         if (pdata && pdata->teardown) {
783                 ret = pdata->teardown(client, chip->gpio_chip.base,
784                                 chip->gpio_chip.ngpio, pdata->context);
785                 if (ret < 0) {
786                         dev_err(&client->dev, "%s failed, %d\n",
787                                         "teardown", ret);
788                         return ret;
789                 }
790         }
791 
792         gpiochip_remove(&chip->gpio_chip);
793 
794         return 0;
795 }
796 
797 /* convenience to stop overlong match-table lines */
798 #define OF_953X(__nrgpio, __int) (void *)(__nrgpio | PCA953X_TYPE | __int)
799 #define OF_957X(__nrgpio, __int) (void *)(__nrgpio | PCA957X_TYPE | __int)
800 
801 static const struct of_device_id pca953x_dt_ids[] = {
802         { .compatible = "nxp,pca9505", .data = OF_953X(40, PCA_INT), },
803         { .compatible = "nxp,pca9534", .data = OF_953X( 8, PCA_INT), },
804         { .compatible = "nxp,pca9535", .data = OF_953X(16, PCA_INT), },
805         { .compatible = "nxp,pca9536", .data = OF_953X( 4, 0), },
806         { .compatible = "nxp,pca9537", .data = OF_953X( 4, PCA_INT), },
807         { .compatible = "nxp,pca9538", .data = OF_953X( 8, PCA_INT), },
808         { .compatible = "nxp,pca9539", .data = OF_953X(16, PCA_INT), },
809         { .compatible = "nxp,pca9554", .data = OF_953X( 8, PCA_INT), },
810         { .compatible = "nxp,pca9555", .data = OF_953X(16, PCA_INT), },
811         { .compatible = "nxp,pca9556", .data = OF_953X( 8, 0), },
812         { .compatible = "nxp,pca9557", .data = OF_953X( 8, 0), },
813         { .compatible = "nxp,pca9574", .data = OF_957X( 8, PCA_INT), },
814         { .compatible = "nxp,pca9575", .data = OF_957X(16, PCA_INT), },
815         { .compatible = "nxp,pca9698", .data = OF_953X(40, 0), },
816 
817         { .compatible = "maxim,max7310", .data = OF_953X( 8, 0), },
818         { .compatible = "maxim,max7312", .data = OF_953X(16, PCA_INT), },
819         { .compatible = "maxim,max7313", .data = OF_953X(16, PCA_INT), },
820         { .compatible = "maxim,max7315", .data = OF_953X( 8, PCA_INT), },
821 
822         { .compatible = "ti,pca6107", .data = OF_953X( 8, PCA_INT), },
823         { .compatible = "ti,tca6408", .data = OF_953X( 8, PCA_INT), },
824         { .compatible = "ti,tca6416", .data = OF_953X(16, PCA_INT), },
825         { .compatible = "ti,tca6424", .data = OF_953X(24, PCA_INT), },
826 
827         { .compatible = "onsemi,pca9654", .data = OF_953X( 8, PCA_INT), },
828 
829         { .compatible = "exar,xra1202", .data = OF_953X( 8, 0), },
830         { }
831 };
832 
833 MODULE_DEVICE_TABLE(of, pca953x_dt_ids);
834 
835 static struct i2c_driver pca953x_driver = {
836         .driver = {
837                 .name   = "pca953x",
838                 .of_match_table = pca953x_dt_ids,
839                 .acpi_match_table = ACPI_PTR(pca953x_acpi_ids),
840         },
841         .probe          = pca953x_probe,
842         .remove         = pca953x_remove,
843         .id_table       = pca953x_id,
844 };
845 
846 static int __init pca953x_init(void)
847 {
848         return i2c_add_driver(&pca953x_driver);
849 }
850 /* register after i2c postcore initcall and before
851  * subsys initcalls that may rely on these GPIOs
852  */
853 subsys_initcall(pca953x_init);
854 
855 static void __exit pca953x_exit(void)
856 {
857         i2c_del_driver(&pca953x_driver);
858 }
859 module_exit(pca953x_exit);
860 
861 MODULE_AUTHOR("eric miao <eric.miao@marvell.com>");
862 MODULE_DESCRIPTION("GPIO expander driver for PCA953x");
863 MODULE_LICENSE("GPL");
864 

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