Version:  2.0.40 2.2.26 2.4.37 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 4.6

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 <asm/unaligned.h>
 22 #include <linux/of_platform.h>
 23 #include <linux/acpi.h>
 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 #define PCA_TYPE_MASK           0xF000
 46 
 47 #define PCA_CHIP_TYPE(x)        ((x) & PCA_TYPE_MASK)
 48 
 49 static const struct i2c_device_id pca953x_id[] = {
 50         { "pca9505", 40 | PCA953X_TYPE | PCA_INT, },
 51         { "pca9534", 8  | PCA953X_TYPE | PCA_INT, },
 52         { "pca9535", 16 | PCA953X_TYPE | PCA_INT, },
 53         { "pca9536", 4  | PCA953X_TYPE, },
 54         { "pca9537", 4  | PCA953X_TYPE | PCA_INT, },
 55         { "pca9538", 8  | PCA953X_TYPE | PCA_INT, },
 56         { "pca9539", 16 | PCA953X_TYPE | PCA_INT, },
 57         { "pca9554", 8  | PCA953X_TYPE | PCA_INT, },
 58         { "pca9555", 16 | PCA953X_TYPE | PCA_INT, },
 59         { "pca9556", 8  | PCA953X_TYPE, },
 60         { "pca9557", 8  | PCA953X_TYPE, },
 61         { "pca9574", 8  | PCA957X_TYPE | PCA_INT, },
 62         { "pca9575", 16 | PCA957X_TYPE | PCA_INT, },
 63         { "pca9698", 40 | PCA953X_TYPE, },
 64 
 65         { "max7310", 8  | PCA953X_TYPE, },
 66         { "max7312", 16 | PCA953X_TYPE | PCA_INT, },
 67         { "max7313", 16 | PCA953X_TYPE | PCA_INT, },
 68         { "max7315", 8  | PCA953X_TYPE | PCA_INT, },
 69         { "pca6107", 8  | PCA953X_TYPE | PCA_INT, },
 70         { "tca6408", 8  | PCA953X_TYPE | PCA_INT, },
 71         { "tca6416", 16 | PCA953X_TYPE | PCA_INT, },
 72         { "tca6424", 24 | PCA953X_TYPE | PCA_INT, },
 73         { "tca9539", 16 | PCA953X_TYPE | PCA_INT, },
 74         { "xra1202", 8  | PCA953X_TYPE },
 75         { }
 76 };
 77 MODULE_DEVICE_TABLE(i2c, pca953x_id);
 78 
 79 static const struct acpi_device_id pca953x_acpi_ids[] = {
 80         { "INT3491", 16 | PCA953X_TYPE | PCA_INT, },
 81         { }
 82 };
 83 MODULE_DEVICE_TABLE(acpi, pca953x_acpi_ids);
 84 
 85 #define MAX_BANK 5
 86 #define BANK_SZ 8
 87 
 88 #define NBANK(chip) (chip->gpio_chip.ngpio / BANK_SZ)
 89 
 90 struct pca953x_chip {
 91         unsigned gpio_start;
 92         u8 reg_output[MAX_BANK];
 93         u8 reg_direction[MAX_BANK];
 94         struct mutex i2c_lock;
 95 
 96 #ifdef CONFIG_GPIO_PCA953X_IRQ
 97         struct mutex irq_lock;
 98         u8 irq_mask[MAX_BANK];
 99         u8 irq_stat[MAX_BANK];
100         u8 irq_trig_raise[MAX_BANK];
101         u8 irq_trig_fall[MAX_BANK];
102 #endif
103 
104         struct i2c_client *client;
105         struct gpio_chip gpio_chip;
106         const char *const *names;
107         int     chip_type;
108         unsigned long driver_data;
109 };
110 
111 static int pca953x_read_single(struct pca953x_chip *chip, int reg, u32 *val,
112                                 int off)
113 {
114         int ret;
115         int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
116         int offset = off / BANK_SZ;
117 
118         ret = i2c_smbus_read_byte_data(chip->client,
119                                 (reg << bank_shift) + offset);
120         *val = ret;
121 
122         if (ret < 0) {
123                 dev_err(&chip->client->dev, "failed reading register\n");
124                 return ret;
125         }
126 
127         return 0;
128 }
129 
130 static int pca953x_write_single(struct pca953x_chip *chip, int reg, u32 val,
131                                 int off)
132 {
133         int ret = 0;
134         int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
135         int offset = off / BANK_SZ;
136 
137         ret = i2c_smbus_write_byte_data(chip->client,
138                                         (reg << bank_shift) + offset, val);
139 
140         if (ret < 0) {
141                 dev_err(&chip->client->dev, "failed writing register\n");
142                 return ret;
143         }
144 
145         return 0;
146 }
147 
148 static int pca953x_write_regs(struct pca953x_chip *chip, int reg, u8 *val)
149 {
150         int ret = 0;
151 
152         if (chip->gpio_chip.ngpio <= 8)
153                 ret = i2c_smbus_write_byte_data(chip->client, reg, *val);
154         else if (chip->gpio_chip.ngpio >= 24) {
155                 int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
156                 ret = i2c_smbus_write_i2c_block_data(chip->client,
157                                         (reg << bank_shift) | REG_ADDR_AI,
158                                         NBANK(chip), val);
159         } else {
160                 switch (chip->chip_type) {
161                 case PCA953X_TYPE:
162                         ret = i2c_smbus_write_word_data(chip->client,
163                             reg << 1, cpu_to_le16(get_unaligned((u16 *)val)));
164                         break;
165                 case PCA957X_TYPE:
166                         ret = i2c_smbus_write_byte_data(chip->client, reg << 1,
167                                                         val[0]);
168                         if (ret < 0)
169                                 break;
170                         ret = i2c_smbus_write_byte_data(chip->client,
171                                                         (reg << 1) + 1,
172                                                         val[1]);
173                         break;
174                 }
175         }
176 
177         if (ret < 0) {
178                 dev_err(&chip->client->dev, "failed writing register\n");
179                 return ret;
180         }
181 
182         return 0;
183 }
184 
185 static int pca953x_read_regs(struct pca953x_chip *chip, int reg, u8 *val)
186 {
187         int ret;
188 
189         if (chip->gpio_chip.ngpio <= 8) {
190                 ret = i2c_smbus_read_byte_data(chip->client, reg);
191                 *val = ret;
192         } else if (chip->gpio_chip.ngpio >= 24) {
193                 int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
194 
195                 ret = i2c_smbus_read_i2c_block_data(chip->client,
196                                         (reg << bank_shift) | REG_ADDR_AI,
197                                         NBANK(chip), val);
198         } else {
199                 ret = i2c_smbus_read_word_data(chip->client, reg << 1);
200                 val[0] = (u16)ret & 0xFF;
201                 val[1] = (u16)ret >> 8;
202         }
203         if (ret < 0) {
204                 dev_err(&chip->client->dev, "failed reading register\n");
205                 return ret;
206         }
207 
208         return 0;
209 }
210 
211 static int pca953x_gpio_direction_input(struct gpio_chip *gc, unsigned off)
212 {
213         struct pca953x_chip *chip = gpiochip_get_data(gc);
214         u8 reg_val;
215         int ret, offset = 0;
216 
217         mutex_lock(&chip->i2c_lock);
218         reg_val = chip->reg_direction[off / BANK_SZ] | (1u << (off % BANK_SZ));
219 
220         switch (chip->chip_type) {
221         case PCA953X_TYPE:
222                 offset = PCA953X_DIRECTION;
223                 break;
224         case PCA957X_TYPE:
225                 offset = PCA957X_CFG;
226                 break;
227         }
228         ret = pca953x_write_single(chip, offset, reg_val, off);
229         if (ret)
230                 goto exit;
231 
232         chip->reg_direction[off / BANK_SZ] = reg_val;
233         ret = 0;
234 exit:
235         mutex_unlock(&chip->i2c_lock);
236         return ret;
237 }
238 
239 static int pca953x_gpio_direction_output(struct gpio_chip *gc,
240                 unsigned off, int val)
241 {
242         struct pca953x_chip *chip = gpiochip_get_data(gc);
243         u8 reg_val;
244         int ret, offset = 0;
245 
246         mutex_lock(&chip->i2c_lock);
247         /* set output level */
248         if (val)
249                 reg_val = chip->reg_output[off / BANK_SZ]
250                         | (1u << (off % BANK_SZ));
251         else
252                 reg_val = chip->reg_output[off / BANK_SZ]
253                         & ~(1u << (off % BANK_SZ));
254 
255         switch (chip->chip_type) {
256         case PCA953X_TYPE:
257                 offset = PCA953X_OUTPUT;
258                 break;
259         case PCA957X_TYPE:
260                 offset = PCA957X_OUT;
261                 break;
262         }
263         ret = pca953x_write_single(chip, offset, reg_val, off);
264         if (ret)
265                 goto exit;
266 
267         chip->reg_output[off / BANK_SZ] = reg_val;
268 
269         /* then direction */
270         reg_val = chip->reg_direction[off / BANK_SZ] & ~(1u << (off % BANK_SZ));
271         switch (chip->chip_type) {
272         case PCA953X_TYPE:
273                 offset = PCA953X_DIRECTION;
274                 break;
275         case PCA957X_TYPE:
276                 offset = PCA957X_CFG;
277                 break;
278         }
279         ret = pca953x_write_single(chip, offset, reg_val, off);
280         if (ret)
281                 goto exit;
282 
283         chip->reg_direction[off / BANK_SZ] = reg_val;
284         ret = 0;
285 exit:
286         mutex_unlock(&chip->i2c_lock);
287         return ret;
288 }
289 
290 static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off)
291 {
292         struct pca953x_chip *chip = gpiochip_get_data(gc);
293         u32 reg_val;
294         int ret, offset = 0;
295 
296         mutex_lock(&chip->i2c_lock);
297         switch (chip->chip_type) {
298         case PCA953X_TYPE:
299                 offset = PCA953X_INPUT;
300                 break;
301         case PCA957X_TYPE:
302                 offset = PCA957X_IN;
303                 break;
304         }
305         ret = pca953x_read_single(chip, offset, &reg_val, off);
306         mutex_unlock(&chip->i2c_lock);
307         if (ret < 0) {
308                 /* NOTE:  diagnostic already emitted; that's all we should
309                  * do unless gpio_*_value_cansleep() calls become different
310                  * from their nonsleeping siblings (and report faults).
311                  */
312                 return 0;
313         }
314 
315         return (reg_val & (1u << (off % BANK_SZ))) ? 1 : 0;
316 }
317 
318 static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val)
319 {
320         struct pca953x_chip *chip = gpiochip_get_data(gc);
321         u8 reg_val;
322         int ret, offset = 0;
323 
324         mutex_lock(&chip->i2c_lock);
325         if (val)
326                 reg_val = chip->reg_output[off / BANK_SZ]
327                         | (1u << (off % BANK_SZ));
328         else
329                 reg_val = chip->reg_output[off / BANK_SZ]
330                         & ~(1u << (off % BANK_SZ));
331 
332         switch (chip->chip_type) {
333         case PCA953X_TYPE:
334                 offset = PCA953X_OUTPUT;
335                 break;
336         case PCA957X_TYPE:
337                 offset = PCA957X_OUT;
338                 break;
339         }
340         ret = pca953x_write_single(chip, offset, reg_val, off);
341         if (ret)
342                 goto exit;
343 
344         chip->reg_output[off / BANK_SZ] = reg_val;
345 exit:
346         mutex_unlock(&chip->i2c_lock);
347 }
348 
349 
350 static void pca953x_gpio_set_multiple(struct gpio_chip *gc,
351                 unsigned long *mask, unsigned long *bits)
352 {
353         struct pca953x_chip *chip = gpiochip_get_data(gc);
354         u8 reg_val[MAX_BANK];
355         int ret, offset = 0;
356         int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
357         int bank;
358 
359         switch (chip->chip_type) {
360         case PCA953X_TYPE:
361                 offset = PCA953X_OUTPUT;
362                 break;
363         case PCA957X_TYPE:
364                 offset = PCA957X_OUT;
365                 break;
366         }
367 
368         memcpy(reg_val, chip->reg_output, NBANK(chip));
369         mutex_lock(&chip->i2c_lock);
370         for(bank=0; bank<NBANK(chip); bank++) {
371                 unsigned bankmask = mask[bank / sizeof(*mask)] >>
372                                     ((bank % sizeof(*mask)) * 8);
373                 if(bankmask) {
374                         unsigned bankval  = bits[bank / sizeof(*bits)] >>
375                                             ((bank % sizeof(*bits)) * 8);
376                         reg_val[bank] = (reg_val[bank] & ~bankmask) | bankval;
377                 }
378         }
379         ret = i2c_smbus_write_i2c_block_data(chip->client, offset << bank_shift, NBANK(chip), reg_val);
380         if (ret)
381                 goto exit;
382 
383         memcpy(chip->reg_output, reg_val, NBANK(chip));
384 exit:
385         mutex_unlock(&chip->i2c_lock);
386 }
387 
388 static void pca953x_setup_gpio(struct pca953x_chip *chip, int gpios)
389 {
390         struct gpio_chip *gc;
391 
392         gc = &chip->gpio_chip;
393 
394         gc->direction_input  = pca953x_gpio_direction_input;
395         gc->direction_output = pca953x_gpio_direction_output;
396         gc->get = pca953x_gpio_get_value;
397         gc->set = pca953x_gpio_set_value;
398         gc->set_multiple = pca953x_gpio_set_multiple;
399         gc->can_sleep = true;
400 
401         gc->base = chip->gpio_start;
402         gc->ngpio = gpios;
403         gc->label = chip->client->name;
404         gc->parent = &chip->client->dev;
405         gc->owner = THIS_MODULE;
406         gc->names = chip->names;
407 }
408 
409 #ifdef CONFIG_GPIO_PCA953X_IRQ
410 static void pca953x_irq_mask(struct irq_data *d)
411 {
412         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
413         struct pca953x_chip *chip = gpiochip_get_data(gc);
414 
415         chip->irq_mask[d->hwirq / BANK_SZ] &= ~(1 << (d->hwirq % BANK_SZ));
416 }
417 
418 static void pca953x_irq_unmask(struct irq_data *d)
419 {
420         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
421         struct pca953x_chip *chip = gpiochip_get_data(gc);
422 
423         chip->irq_mask[d->hwirq / BANK_SZ] |= 1 << (d->hwirq % BANK_SZ);
424 }
425 
426 static void pca953x_irq_bus_lock(struct irq_data *d)
427 {
428         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
429         struct pca953x_chip *chip = gpiochip_get_data(gc);
430 
431         mutex_lock(&chip->irq_lock);
432 }
433 
434 static void pca953x_irq_bus_sync_unlock(struct irq_data *d)
435 {
436         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
437         struct pca953x_chip *chip = gpiochip_get_data(gc);
438         u8 new_irqs;
439         int level, i;
440 
441         /* Look for any newly setup interrupt */
442         for (i = 0; i < NBANK(chip); i++) {
443                 new_irqs = chip->irq_trig_fall[i] | chip->irq_trig_raise[i];
444                 new_irqs &= ~chip->reg_direction[i];
445 
446                 while (new_irqs) {
447                         level = __ffs(new_irqs);
448                         pca953x_gpio_direction_input(&chip->gpio_chip,
449                                                         level + (BANK_SZ * i));
450                         new_irqs &= ~(1 << level);
451                 }
452         }
453 
454         mutex_unlock(&chip->irq_lock);
455 }
456 
457 static int pca953x_irq_set_type(struct irq_data *d, unsigned int type)
458 {
459         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
460         struct pca953x_chip *chip = gpiochip_get_data(gc);
461         int bank_nb = d->hwirq / BANK_SZ;
462         u8 mask = 1 << (d->hwirq % BANK_SZ);
463 
464         if (!(type & IRQ_TYPE_EDGE_BOTH)) {
465                 dev_err(&chip->client->dev, "irq %d: unsupported type %d\n",
466                         d->irq, type);
467                 return -EINVAL;
468         }
469 
470         if (type & IRQ_TYPE_EDGE_FALLING)
471                 chip->irq_trig_fall[bank_nb] |= mask;
472         else
473                 chip->irq_trig_fall[bank_nb] &= ~mask;
474 
475         if (type & IRQ_TYPE_EDGE_RISING)
476                 chip->irq_trig_raise[bank_nb] |= mask;
477         else
478                 chip->irq_trig_raise[bank_nb] &= ~mask;
479 
480         return 0;
481 }
482 
483 static struct irq_chip pca953x_irq_chip = {
484         .name                   = "pca953x",
485         .irq_mask               = pca953x_irq_mask,
486         .irq_unmask             = pca953x_irq_unmask,
487         .irq_bus_lock           = pca953x_irq_bus_lock,
488         .irq_bus_sync_unlock    = pca953x_irq_bus_sync_unlock,
489         .irq_set_type           = pca953x_irq_set_type,
490 };
491 
492 static bool pca953x_irq_pending(struct pca953x_chip *chip, u8 *pending)
493 {
494         u8 cur_stat[MAX_BANK];
495         u8 old_stat[MAX_BANK];
496         bool pending_seen = false;
497         bool trigger_seen = false;
498         u8 trigger[MAX_BANK];
499         int ret, i, offset = 0;
500 
501         switch (chip->chip_type) {
502         case PCA953X_TYPE:
503                 offset = PCA953X_INPUT;
504                 break;
505         case PCA957X_TYPE:
506                 offset = PCA957X_IN;
507                 break;
508         }
509         ret = pca953x_read_regs(chip, offset, cur_stat);
510         if (ret)
511                 return false;
512 
513         /* Remove output pins from the equation */
514         for (i = 0; i < NBANK(chip); i++)
515                 cur_stat[i] &= chip->reg_direction[i];
516 
517         memcpy(old_stat, chip->irq_stat, NBANK(chip));
518 
519         for (i = 0; i < NBANK(chip); i++) {
520                 trigger[i] = (cur_stat[i] ^ old_stat[i]) & chip->irq_mask[i];
521                 if (trigger[i])
522                         trigger_seen = true;
523         }
524 
525         if (!trigger_seen)
526                 return false;
527 
528         memcpy(chip->irq_stat, cur_stat, NBANK(chip));
529 
530         for (i = 0; i < NBANK(chip); i++) {
531                 pending[i] = (old_stat[i] & chip->irq_trig_fall[i]) |
532                         (cur_stat[i] & chip->irq_trig_raise[i]);
533                 pending[i] &= trigger[i];
534                 if (pending[i])
535                         pending_seen = true;
536         }
537 
538         return pending_seen;
539 }
540 
541 static irqreturn_t pca953x_irq_handler(int irq, void *devid)
542 {
543         struct pca953x_chip *chip = devid;
544         u8 pending[MAX_BANK];
545         u8 level;
546         unsigned nhandled = 0;
547         int i;
548 
549         if (!pca953x_irq_pending(chip, pending))
550                 return IRQ_NONE;
551 
552         for (i = 0; i < NBANK(chip); i++) {
553                 while (pending[i]) {
554                         level = __ffs(pending[i]);
555                         handle_nested_irq(irq_find_mapping(chip->gpio_chip.irqdomain,
556                                                         level + (BANK_SZ * i)));
557                         pending[i] &= ~(1 << level);
558                         nhandled++;
559                 }
560         }
561 
562         return (nhandled > 0) ? IRQ_HANDLED : IRQ_NONE;
563 }
564 
565 static int pca953x_irq_setup(struct pca953x_chip *chip,
566                              int irq_base)
567 {
568         struct i2c_client *client = chip->client;
569         int ret, i, offset = 0;
570 
571         if (client->irq && irq_base != -1
572                         && (chip->driver_data & PCA_INT)) {
573 
574                 switch (chip->chip_type) {
575                 case PCA953X_TYPE:
576                         offset = PCA953X_INPUT;
577                         break;
578                 case PCA957X_TYPE:
579                         offset = PCA957X_IN;
580                         break;
581                 }
582                 ret = pca953x_read_regs(chip, offset, chip->irq_stat);
583                 if (ret)
584                         return ret;
585 
586                 /*
587                  * There is no way to know which GPIO line generated the
588                  * interrupt.  We have to rely on the previous read for
589                  * this purpose.
590                  */
591                 for (i = 0; i < NBANK(chip); i++)
592                         chip->irq_stat[i] &= chip->reg_direction[i];
593                 mutex_init(&chip->irq_lock);
594 
595                 ret = devm_request_threaded_irq(&client->dev,
596                                         client->irq,
597                                            NULL,
598                                            pca953x_irq_handler,
599                                            IRQF_TRIGGER_LOW | IRQF_ONESHOT |
600                                                    IRQF_SHARED,
601                                            dev_name(&client->dev), chip);
602                 if (ret) {
603                         dev_err(&client->dev, "failed to request irq %d\n",
604                                 client->irq);
605                         return ret;
606                 }
607 
608                 ret =  gpiochip_irqchip_add(&chip->gpio_chip,
609                                             &pca953x_irq_chip,
610                                             irq_base,
611                                             handle_simple_irq,
612                                             IRQ_TYPE_NONE);
613                 if (ret) {
614                         dev_err(&client->dev,
615                                 "could not connect irqchip to gpiochip\n");
616                         return ret;
617                 }
618 
619                 gpiochip_set_chained_irqchip(&chip->gpio_chip,
620                                              &pca953x_irq_chip,
621                                              client->irq, NULL);
622         }
623 
624         return 0;
625 }
626 
627 #else /* CONFIG_GPIO_PCA953X_IRQ */
628 static int pca953x_irq_setup(struct pca953x_chip *chip,
629                              int irq_base)
630 {
631         struct i2c_client *client = chip->client;
632 
633         if (irq_base != -1 && (chip->driver_data & PCA_INT))
634                 dev_warn(&client->dev, "interrupt support not compiled in\n");
635 
636         return 0;
637 }
638 #endif
639 
640 static int device_pca953x_init(struct pca953x_chip *chip, u32 invert)
641 {
642         int ret;
643         u8 val[MAX_BANK];
644 
645         ret = pca953x_read_regs(chip, PCA953X_OUTPUT, chip->reg_output);
646         if (ret)
647                 goto out;
648 
649         ret = pca953x_read_regs(chip, PCA953X_DIRECTION,
650                                chip->reg_direction);
651         if (ret)
652                 goto out;
653 
654         /* set platform specific polarity inversion */
655         if (invert)
656                 memset(val, 0xFF, NBANK(chip));
657         else
658                 memset(val, 0, NBANK(chip));
659 
660         ret = pca953x_write_regs(chip, PCA953X_INVERT, val);
661 out:
662         return ret;
663 }
664 
665 static int device_pca957x_init(struct pca953x_chip *chip, u32 invert)
666 {
667         int ret;
668         u8 val[MAX_BANK];
669 
670         ret = pca953x_read_regs(chip, PCA957X_OUT, chip->reg_output);
671         if (ret)
672                 goto out;
673         ret = pca953x_read_regs(chip, PCA957X_CFG, chip->reg_direction);
674         if (ret)
675                 goto out;
676 
677         /* set platform specific polarity inversion */
678         if (invert)
679                 memset(val, 0xFF, NBANK(chip));
680         else
681                 memset(val, 0, NBANK(chip));
682         ret = pca953x_write_regs(chip, PCA957X_INVRT, val);
683         if (ret)
684                 goto out;
685 
686         /* To enable register 6, 7 to control pull up and pull down */
687         memset(val, 0x02, NBANK(chip));
688         ret = pca953x_write_regs(chip, PCA957X_BKEN, val);
689         if (ret)
690                 goto out;
691 
692         return 0;
693 out:
694         return ret;
695 }
696 
697 static const struct of_device_id pca953x_dt_ids[];
698 
699 static int pca953x_probe(struct i2c_client *client,
700                                    const struct i2c_device_id *id)
701 {
702         struct pca953x_platform_data *pdata;
703         struct pca953x_chip *chip;
704         int irq_base = 0;
705         int ret;
706         u32 invert = 0;
707 
708         chip = devm_kzalloc(&client->dev,
709                         sizeof(struct pca953x_chip), GFP_KERNEL);
710         if (chip == NULL)
711                 return -ENOMEM;
712 
713         pdata = dev_get_platdata(&client->dev);
714         if (pdata) {
715                 irq_base = pdata->irq_base;
716                 chip->gpio_start = pdata->gpio_base;
717                 invert = pdata->invert;
718                 chip->names = pdata->names;
719         } else {
720                 chip->gpio_start = -1;
721                 irq_base = 0;
722         }
723 
724         chip->client = client;
725 
726         if (id) {
727                 chip->driver_data = id->driver_data;
728         } else {
729                 const struct acpi_device_id *id;
730                 const struct of_device_id *match;
731 
732                 match = of_match_device(pca953x_dt_ids, &client->dev);
733                 if (match) {
734                         chip->driver_data = (int)(uintptr_t)match->data;
735                 } else {
736                         id = acpi_match_device(pca953x_acpi_ids, &client->dev);
737                         if (!id)
738                                 return -ENODEV;
739 
740                         chip->driver_data = id->driver_data;
741                 }
742         }
743 
744         chip->chip_type = PCA_CHIP_TYPE(chip->driver_data);
745 
746         mutex_init(&chip->i2c_lock);
747 
748         /* initialize cached registers from their original values.
749          * we can't share this chip with another i2c master.
750          */
751         pca953x_setup_gpio(chip, chip->driver_data & PCA_GPIO_MASK);
752 
753         if (chip->chip_type == PCA953X_TYPE)
754                 ret = device_pca953x_init(chip, invert);
755         else
756                 ret = device_pca957x_init(chip, invert);
757         if (ret)
758                 return ret;
759 
760         ret = devm_gpiochip_add_data(&client->dev, &chip->gpio_chip, chip);
761         if (ret)
762                 return ret;
763 
764         ret = pca953x_irq_setup(chip, irq_base);
765         if (ret)
766                 return ret;
767 
768         if (pdata && pdata->setup) {
769                 ret = pdata->setup(client, chip->gpio_chip.base,
770                                 chip->gpio_chip.ngpio, pdata->context);
771                 if (ret < 0)
772                         dev_warn(&client->dev, "setup failed, %d\n", ret);
773         }
774 
775         i2c_set_clientdata(client, chip);
776         return 0;
777 }
778 
779 static int pca953x_remove(struct i2c_client *client)
780 {
781         struct pca953x_platform_data *pdata = dev_get_platdata(&client->dev);
782         struct pca953x_chip *chip = i2c_get_clientdata(client);
783         int ret = 0;
784 
785         if (pdata && pdata->teardown) {
786                 ret = pdata->teardown(client, chip->gpio_chip.base,
787                                 chip->gpio_chip.ngpio, pdata->context);
788                 if (ret < 0) {
789                         dev_err(&client->dev, "%s failed, %d\n",
790                                         "teardown", ret);
791                         return ret;
792                 }
793         }
794 
795         return 0;
796 }
797 
798 /* convenience to stop overlong match-table lines */
799 #define OF_953X(__nrgpio, __int) (void *)(__nrgpio | PCA953X_TYPE | __int)
800 #define OF_957X(__nrgpio, __int) (void *)(__nrgpio | PCA957X_TYPE | __int)
801 
802 static const struct of_device_id pca953x_dt_ids[] = {
803         { .compatible = "nxp,pca9505", .data = OF_953X(40, PCA_INT), },
804         { .compatible = "nxp,pca9534", .data = OF_953X( 8, PCA_INT), },
805         { .compatible = "nxp,pca9535", .data = OF_953X(16, PCA_INT), },
806         { .compatible = "nxp,pca9536", .data = OF_953X( 4, 0), },
807         { .compatible = "nxp,pca9537", .data = OF_953X( 4, PCA_INT), },
808         { .compatible = "nxp,pca9538", .data = OF_953X( 8, PCA_INT), },
809         { .compatible = "nxp,pca9539", .data = OF_953X(16, PCA_INT), },
810         { .compatible = "nxp,pca9554", .data = OF_953X( 8, PCA_INT), },
811         { .compatible = "nxp,pca9555", .data = OF_953X(16, PCA_INT), },
812         { .compatible = "nxp,pca9556", .data = OF_953X( 8, 0), },
813         { .compatible = "nxp,pca9557", .data = OF_953X( 8, 0), },
814         { .compatible = "nxp,pca9574", .data = OF_957X( 8, PCA_INT), },
815         { .compatible = "nxp,pca9575", .data = OF_957X(16, PCA_INT), },
816         { .compatible = "nxp,pca9698", .data = OF_953X(40, 0), },
817 
818         { .compatible = "maxim,max7310", .data = OF_953X( 8, 0), },
819         { .compatible = "maxim,max7312", .data = OF_953X(16, PCA_INT), },
820         { .compatible = "maxim,max7313", .data = OF_953X(16, PCA_INT), },
821         { .compatible = "maxim,max7315", .data = OF_953X( 8, PCA_INT), },
822 
823         { .compatible = "ti,pca6107", .data = OF_953X( 8, PCA_INT), },
824         { .compatible = "ti,tca6408", .data = OF_953X( 8, PCA_INT), },
825         { .compatible = "ti,tca6416", .data = OF_953X(16, PCA_INT), },
826         { .compatible = "ti,tca6424", .data = OF_953X(24, PCA_INT), },
827 
828         { .compatible = "onsemi,pca9654", .data = OF_953X( 8, PCA_INT), },
829 
830         { .compatible = "exar,xra1202", .data = OF_953X( 8, 0), },
831         { }
832 };
833 
834 MODULE_DEVICE_TABLE(of, pca953x_dt_ids);
835 
836 static struct i2c_driver pca953x_driver = {
837         .driver = {
838                 .name   = "pca953x",
839                 .of_match_table = pca953x_dt_ids,
840                 .acpi_match_table = ACPI_PTR(pca953x_acpi_ids),
841         },
842         .probe          = pca953x_probe,
843         .remove         = pca953x_remove,
844         .id_table       = pca953x_id,
845 };
846 
847 static int __init pca953x_init(void)
848 {
849         return i2c_add_driver(&pca953x_driver);
850 }
851 /* register after i2c postcore initcall and before
852  * subsys initcalls that may rely on these GPIOs
853  */
854 subsys_initcall(pca953x_init);
855 
856 static void __exit pca953x_exit(void)
857 {
858         i2c_del_driver(&pca953x_driver);
859 }
860 module_exit(pca953x_exit);
861 
862 MODULE_AUTHOR("eric miao <eric.miao@marvell.com>");
863 MODULE_DESCRIPTION("GPIO expander driver for PCA953x");
864 MODULE_LICENSE("GPL");
865 

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