Version:  2.0.40 2.2.26 2.4.37 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 4.7 4.8 4.9

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 #include <linux/regulator/consumer.h>
 25 
 26 #define PCA953X_INPUT           0
 27 #define PCA953X_OUTPUT          1
 28 #define PCA953X_INVERT          2
 29 #define PCA953X_DIRECTION       3
 30 
 31 #define REG_ADDR_AI             0x80
 32 
 33 #define PCA957X_IN              0
 34 #define PCA957X_INVRT           1
 35 #define PCA957X_BKEN            2
 36 #define PCA957X_PUPD            3
 37 #define PCA957X_CFG             4
 38 #define PCA957X_OUT             5
 39 #define PCA957X_MSK             6
 40 #define PCA957X_INTS            7
 41 
 42 #define PCAL953X_IN_LATCH       34
 43 #define PCAL953X_INT_MASK       37
 44 #define PCAL953X_INT_STAT       38
 45 
 46 #define PCA_GPIO_MASK           0x00FF
 47 #define PCA_INT                 0x0100
 48 #define PCA_PCAL                0x0200
 49 #define PCA953X_TYPE            0x1000
 50 #define PCA957X_TYPE            0x2000
 51 #define PCA_TYPE_MASK           0xF000
 52 
 53 #define PCA_CHIP_TYPE(x)        ((x) & PCA_TYPE_MASK)
 54 
 55 static const struct i2c_device_id pca953x_id[] = {
 56         { "pca9505", 40 | PCA953X_TYPE | PCA_INT, },
 57         { "pca9534", 8  | PCA953X_TYPE | PCA_INT, },
 58         { "pca9535", 16 | PCA953X_TYPE | PCA_INT, },
 59         { "pca9536", 4  | PCA953X_TYPE, },
 60         { "pca9537", 4  | PCA953X_TYPE | PCA_INT, },
 61         { "pca9538", 8  | PCA953X_TYPE | PCA_INT, },
 62         { "pca9539", 16 | PCA953X_TYPE | PCA_INT, },
 63         { "pca9554", 8  | PCA953X_TYPE | PCA_INT, },
 64         { "pca9555", 16 | PCA953X_TYPE | PCA_INT, },
 65         { "pca9556", 8  | PCA953X_TYPE, },
 66         { "pca9557", 8  | PCA953X_TYPE, },
 67         { "pca9574", 8  | PCA957X_TYPE | PCA_INT, },
 68         { "pca9575", 16 | PCA957X_TYPE | PCA_INT, },
 69         { "pca9698", 40 | PCA953X_TYPE, },
 70 
 71         { "pcal9555a", 16 | PCA953X_TYPE | PCA_INT | PCA_PCAL, },
 72 
 73         { "max7310", 8  | PCA953X_TYPE, },
 74         { "max7312", 16 | PCA953X_TYPE | PCA_INT, },
 75         { "max7313", 16 | PCA953X_TYPE | PCA_INT, },
 76         { "max7315", 8  | PCA953X_TYPE | PCA_INT, },
 77         { "pca6107", 8  | PCA953X_TYPE | PCA_INT, },
 78         { "tca6408", 8  | PCA953X_TYPE | PCA_INT, },
 79         { "tca6416", 16 | PCA953X_TYPE | PCA_INT, },
 80         { "tca6424", 24 | PCA953X_TYPE | PCA_INT, },
 81         { "tca9539", 16 | PCA953X_TYPE | PCA_INT, },
 82         { "xra1202", 8  | PCA953X_TYPE },
 83         { }
 84 };
 85 MODULE_DEVICE_TABLE(i2c, pca953x_id);
 86 
 87 static const struct acpi_device_id pca953x_acpi_ids[] = {
 88         { "INT3491", 16 | PCA953X_TYPE | PCA_INT | PCA_PCAL, },
 89         { }
 90 };
 91 MODULE_DEVICE_TABLE(acpi, pca953x_acpi_ids);
 92 
 93 #define MAX_BANK 5
 94 #define BANK_SZ 8
 95 
 96 #define NBANK(chip) DIV_ROUND_UP(chip->gpio_chip.ngpio, BANK_SZ)
 97 
 98 struct pca953x_reg_config {
 99         int direction;
100         int output;
101         int input;
102 };
103 
104 static const struct pca953x_reg_config pca953x_regs = {
105         .direction = PCA953X_DIRECTION,
106         .output = PCA953X_OUTPUT,
107         .input = PCA953X_INPUT,
108 };
109 
110 static const struct pca953x_reg_config pca957x_regs = {
111         .direction = PCA957X_CFG,
112         .output = PCA957X_OUT,
113         .input = PCA957X_IN,
114 };
115 
116 struct pca953x_chip {
117         unsigned gpio_start;
118         u8 reg_output[MAX_BANK];
119         u8 reg_direction[MAX_BANK];
120         struct mutex i2c_lock;
121 
122 #ifdef CONFIG_GPIO_PCA953X_IRQ
123         struct mutex irq_lock;
124         u8 irq_mask[MAX_BANK];
125         u8 irq_stat[MAX_BANK];
126         u8 irq_trig_raise[MAX_BANK];
127         u8 irq_trig_fall[MAX_BANK];
128 #endif
129 
130         struct i2c_client *client;
131         struct gpio_chip gpio_chip;
132         const char *const *names;
133         unsigned long driver_data;
134         struct regulator *regulator;
135 
136         const struct pca953x_reg_config *regs;
137 
138         int (*write_regs)(struct pca953x_chip *, int, u8 *);
139         int (*read_regs)(struct pca953x_chip *, int, u8 *);
140 };
141 
142 static int pca953x_read_single(struct pca953x_chip *chip, int reg, u32 *val,
143                                 int off)
144 {
145         int ret;
146         int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
147         int offset = off / BANK_SZ;
148 
149         ret = i2c_smbus_read_byte_data(chip->client,
150                                 (reg << bank_shift) + offset);
151         *val = ret;
152 
153         if (ret < 0) {
154                 dev_err(&chip->client->dev, "failed reading register\n");
155                 return ret;
156         }
157 
158         return 0;
159 }
160 
161 static int pca953x_write_single(struct pca953x_chip *chip, int reg, u32 val,
162                                 int off)
163 {
164         int ret;
165         int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
166         int offset = off / BANK_SZ;
167 
168         ret = i2c_smbus_write_byte_data(chip->client,
169                                         (reg << bank_shift) + offset, val);
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_write_regs_8(struct pca953x_chip *chip, int reg, u8 *val)
180 {
181         return i2c_smbus_write_byte_data(chip->client, reg, *val);
182 }
183 
184 static int pca953x_write_regs_16(struct pca953x_chip *chip, int reg, u8 *val)
185 {
186         __le16 word = cpu_to_le16(get_unaligned((u16 *)val));
187 
188         return i2c_smbus_write_word_data(chip->client,
189                                          reg << 1, (__force u16)word);
190 }
191 
192 static int pca957x_write_regs_16(struct pca953x_chip *chip, int reg, u8 *val)
193 {
194         int ret;
195 
196         ret = i2c_smbus_write_byte_data(chip->client, reg << 1, val[0]);
197         if (ret < 0)
198                 return ret;
199 
200         return i2c_smbus_write_byte_data(chip->client, (reg << 1) + 1, val[1]);
201 }
202 
203 static int pca953x_write_regs_24(struct pca953x_chip *chip, int reg, u8 *val)
204 {
205         int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
206 
207         return i2c_smbus_write_i2c_block_data(chip->client,
208                                               (reg << bank_shift) | REG_ADDR_AI,
209                                               NBANK(chip), val);
210 }
211 
212 static int pca953x_write_regs(struct pca953x_chip *chip, int reg, u8 *val)
213 {
214         int ret = 0;
215 
216         ret = chip->write_regs(chip, reg, val);
217         if (ret < 0) {
218                 dev_err(&chip->client->dev, "failed writing register\n");
219                 return ret;
220         }
221 
222         return 0;
223 }
224 
225 static int pca953x_read_regs_8(struct pca953x_chip *chip, int reg, u8 *val)
226 {
227         int ret;
228 
229         ret = i2c_smbus_read_byte_data(chip->client, reg);
230         *val = ret;
231 
232         return ret;
233 }
234 
235 static int pca953x_read_regs_16(struct pca953x_chip *chip, int reg, u8 *val)
236 {
237         int ret;
238 
239         ret = i2c_smbus_read_word_data(chip->client, reg << 1);
240         val[0] = (u16)ret & 0xFF;
241         val[1] = (u16)ret >> 8;
242 
243         return ret;
244 }
245 
246 static int pca953x_read_regs_24(struct pca953x_chip *chip, int reg, u8 *val)
247 {
248         int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
249 
250         return i2c_smbus_read_i2c_block_data(chip->client,
251                                              (reg << bank_shift) | REG_ADDR_AI,
252                                              NBANK(chip), val);
253 }
254 
255 static int pca953x_read_regs(struct pca953x_chip *chip, int reg, u8 *val)
256 {
257         int ret;
258 
259         ret = chip->read_regs(chip, reg, val);
260         if (ret < 0) {
261                 dev_err(&chip->client->dev, "failed reading register\n");
262                 return ret;
263         }
264 
265         return 0;
266 }
267 
268 static int pca953x_gpio_direction_input(struct gpio_chip *gc, unsigned off)
269 {
270         struct pca953x_chip *chip = gpiochip_get_data(gc);
271         u8 reg_val;
272         int ret;
273 
274         mutex_lock(&chip->i2c_lock);
275         reg_val = chip->reg_direction[off / BANK_SZ] | (1u << (off % BANK_SZ));
276 
277         ret = pca953x_write_single(chip, chip->regs->direction, reg_val, off);
278         if (ret)
279                 goto exit;
280 
281         chip->reg_direction[off / BANK_SZ] = reg_val;
282 exit:
283         mutex_unlock(&chip->i2c_lock);
284         return ret;
285 }
286 
287 static int pca953x_gpio_direction_output(struct gpio_chip *gc,
288                 unsigned off, int val)
289 {
290         struct pca953x_chip *chip = gpiochip_get_data(gc);
291         u8 reg_val;
292         int ret;
293 
294         mutex_lock(&chip->i2c_lock);
295         /* set output level */
296         if (val)
297                 reg_val = chip->reg_output[off / BANK_SZ]
298                         | (1u << (off % BANK_SZ));
299         else
300                 reg_val = chip->reg_output[off / BANK_SZ]
301                         & ~(1u << (off % BANK_SZ));
302 
303         ret = pca953x_write_single(chip, chip->regs->output, reg_val, off);
304         if (ret)
305                 goto exit;
306 
307         chip->reg_output[off / BANK_SZ] = reg_val;
308 
309         /* then direction */
310         reg_val = chip->reg_direction[off / BANK_SZ] & ~(1u << (off % BANK_SZ));
311         ret = pca953x_write_single(chip, chip->regs->direction, reg_val, off);
312         if (ret)
313                 goto exit;
314 
315         chip->reg_direction[off / BANK_SZ] = reg_val;
316 exit:
317         mutex_unlock(&chip->i2c_lock);
318         return ret;
319 }
320 
321 static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off)
322 {
323         struct pca953x_chip *chip = gpiochip_get_data(gc);
324         u32 reg_val;
325         int ret;
326 
327         mutex_lock(&chip->i2c_lock);
328         ret = pca953x_read_single(chip, chip->regs->input, &reg_val, off);
329         mutex_unlock(&chip->i2c_lock);
330         if (ret < 0) {
331                 /* NOTE:  diagnostic already emitted; that's all we should
332                  * do unless gpio_*_value_cansleep() calls become different
333                  * from their nonsleeping siblings (and report faults).
334                  */
335                 return 0;
336         }
337 
338         return (reg_val & (1u << (off % BANK_SZ))) ? 1 : 0;
339 }
340 
341 static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val)
342 {
343         struct pca953x_chip *chip = gpiochip_get_data(gc);
344         u8 reg_val;
345         int ret;
346 
347         mutex_lock(&chip->i2c_lock);
348         if (val)
349                 reg_val = chip->reg_output[off / BANK_SZ]
350                         | (1u << (off % BANK_SZ));
351         else
352                 reg_val = chip->reg_output[off / BANK_SZ]
353                         & ~(1u << (off % BANK_SZ));
354 
355         ret = pca953x_write_single(chip, chip->regs->output, reg_val, off);
356         if (ret)
357                 goto exit;
358 
359         chip->reg_output[off / BANK_SZ] = reg_val;
360 exit:
361         mutex_unlock(&chip->i2c_lock);
362 }
363 
364 static void pca953x_gpio_set_multiple(struct gpio_chip *gc,
365                                       unsigned long *mask, unsigned long *bits)
366 {
367         struct pca953x_chip *chip = gpiochip_get_data(gc);
368         unsigned int bank_mask, bank_val;
369         int bank_shift, bank;
370         u8 reg_val[MAX_BANK];
371         int ret;
372 
373         bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
374 
375         mutex_lock(&chip->i2c_lock);
376         memcpy(reg_val, chip->reg_output, NBANK(chip));
377         for (bank = 0; bank < NBANK(chip); bank++) {
378                 bank_mask = mask[bank / sizeof(*mask)] >>
379                            ((bank % sizeof(*mask)) * 8);
380                 if (bank_mask) {
381                         bank_val = bits[bank / sizeof(*bits)] >>
382                                   ((bank % sizeof(*bits)) * 8);
383                         bank_val &= bank_mask;
384                         reg_val[bank] = (reg_val[bank] & ~bank_mask) | bank_val;
385                 }
386         }
387 
388         ret = i2c_smbus_write_i2c_block_data(chip->client,
389                                              chip->regs->output << bank_shift,
390                                              NBANK(chip), reg_val);
391         if (ret)
392                 goto exit;
393 
394         memcpy(chip->reg_output, reg_val, NBANK(chip));
395 exit:
396         mutex_unlock(&chip->i2c_lock);
397 }
398 
399 static void pca953x_setup_gpio(struct pca953x_chip *chip, int gpios)
400 {
401         struct gpio_chip *gc;
402 
403         gc = &chip->gpio_chip;
404 
405         gc->direction_input  = pca953x_gpio_direction_input;
406         gc->direction_output = pca953x_gpio_direction_output;
407         gc->get = pca953x_gpio_get_value;
408         gc->set = pca953x_gpio_set_value;
409         gc->set_multiple = pca953x_gpio_set_multiple;
410         gc->can_sleep = true;
411 
412         gc->base = chip->gpio_start;
413         gc->ngpio = gpios;
414         gc->label = chip->client->name;
415         gc->parent = &chip->client->dev;
416         gc->owner = THIS_MODULE;
417         gc->names = chip->names;
418 }
419 
420 #ifdef CONFIG_GPIO_PCA953X_IRQ
421 static void pca953x_irq_mask(struct irq_data *d)
422 {
423         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
424         struct pca953x_chip *chip = gpiochip_get_data(gc);
425 
426         chip->irq_mask[d->hwirq / BANK_SZ] &= ~(1 << (d->hwirq % BANK_SZ));
427 }
428 
429 static void pca953x_irq_unmask(struct irq_data *d)
430 {
431         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
432         struct pca953x_chip *chip = gpiochip_get_data(gc);
433 
434         chip->irq_mask[d->hwirq / BANK_SZ] |= 1 << (d->hwirq % BANK_SZ);
435 }
436 
437 static void pca953x_irq_bus_lock(struct irq_data *d)
438 {
439         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
440         struct pca953x_chip *chip = gpiochip_get_data(gc);
441 
442         mutex_lock(&chip->irq_lock);
443 }
444 
445 static void pca953x_irq_bus_sync_unlock(struct irq_data *d)
446 {
447         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
448         struct pca953x_chip *chip = gpiochip_get_data(gc);
449         u8 new_irqs;
450         int level, i;
451         u8 invert_irq_mask[MAX_BANK];
452 
453         if (chip->driver_data & PCA_PCAL) {
454                 /* Enable latch on interrupt-enabled inputs */
455                 pca953x_write_regs(chip, PCAL953X_IN_LATCH, chip->irq_mask);
456 
457                 for (i = 0; i < NBANK(chip); i++)
458                         invert_irq_mask[i] = ~chip->irq_mask[i];
459 
460                 /* Unmask enabled interrupts */
461                 pca953x_write_regs(chip, PCAL953X_INT_MASK, invert_irq_mask);
462         }
463 
464         /* Look for any newly setup interrupt */
465         for (i = 0; i < NBANK(chip); i++) {
466                 new_irqs = chip->irq_trig_fall[i] | chip->irq_trig_raise[i];
467                 new_irqs &= ~chip->reg_direction[i];
468 
469                 while (new_irqs) {
470                         level = __ffs(new_irqs);
471                         pca953x_gpio_direction_input(&chip->gpio_chip,
472                                                         level + (BANK_SZ * i));
473                         new_irqs &= ~(1 << level);
474                 }
475         }
476 
477         mutex_unlock(&chip->irq_lock);
478 }
479 
480 static int pca953x_irq_set_type(struct irq_data *d, unsigned int type)
481 {
482         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
483         struct pca953x_chip *chip = gpiochip_get_data(gc);
484         int bank_nb = d->hwirq / BANK_SZ;
485         u8 mask = 1 << (d->hwirq % BANK_SZ);
486 
487         if (!(type & IRQ_TYPE_EDGE_BOTH)) {
488                 dev_err(&chip->client->dev, "irq %d: unsupported type %d\n",
489                         d->irq, type);
490                 return -EINVAL;
491         }
492 
493         if (type & IRQ_TYPE_EDGE_FALLING)
494                 chip->irq_trig_fall[bank_nb] |= mask;
495         else
496                 chip->irq_trig_fall[bank_nb] &= ~mask;
497 
498         if (type & IRQ_TYPE_EDGE_RISING)
499                 chip->irq_trig_raise[bank_nb] |= mask;
500         else
501                 chip->irq_trig_raise[bank_nb] &= ~mask;
502 
503         return 0;
504 }
505 
506 static struct irq_chip pca953x_irq_chip = {
507         .name                   = "pca953x",
508         .irq_mask               = pca953x_irq_mask,
509         .irq_unmask             = pca953x_irq_unmask,
510         .irq_bus_lock           = pca953x_irq_bus_lock,
511         .irq_bus_sync_unlock    = pca953x_irq_bus_sync_unlock,
512         .irq_set_type           = pca953x_irq_set_type,
513 };
514 
515 static bool pca953x_irq_pending(struct pca953x_chip *chip, u8 *pending)
516 {
517         u8 cur_stat[MAX_BANK];
518         u8 old_stat[MAX_BANK];
519         bool pending_seen = false;
520         bool trigger_seen = false;
521         u8 trigger[MAX_BANK];
522         int ret, i;
523 
524         if (chip->driver_data & PCA_PCAL) {
525                 /* Read the current interrupt status from the device */
526                 ret = pca953x_read_regs(chip, PCAL953X_INT_STAT, trigger);
527                 if (ret)
528                         return false;
529 
530                 /* Check latched inputs and clear interrupt status */
531                 ret = pca953x_read_regs(chip, PCA953X_INPUT, cur_stat);
532                 if (ret)
533                         return false;
534 
535                 for (i = 0; i < NBANK(chip); i++) {
536                         /* Apply filter for rising/falling edge selection */
537                         pending[i] = (~cur_stat[i] & chip->irq_trig_fall[i]) |
538                                 (cur_stat[i] & chip->irq_trig_raise[i]);
539                         pending[i] &= trigger[i];
540                         if (pending[i])
541                                 pending_seen = true;
542                 }
543 
544                 return pending_seen;
545         }
546 
547         ret = pca953x_read_regs(chip, chip->regs->input, cur_stat);
548         if (ret)
549                 return false;
550 
551         /* Remove output pins from the equation */
552         for (i = 0; i < NBANK(chip); i++)
553                 cur_stat[i] &= chip->reg_direction[i];
554 
555         memcpy(old_stat, chip->irq_stat, NBANK(chip));
556 
557         for (i = 0; i < NBANK(chip); i++) {
558                 trigger[i] = (cur_stat[i] ^ old_stat[i]) & chip->irq_mask[i];
559                 if (trigger[i])
560                         trigger_seen = true;
561         }
562 
563         if (!trigger_seen)
564                 return false;
565 
566         memcpy(chip->irq_stat, cur_stat, NBANK(chip));
567 
568         for (i = 0; i < NBANK(chip); i++) {
569                 pending[i] = (old_stat[i] & chip->irq_trig_fall[i]) |
570                         (cur_stat[i] & chip->irq_trig_raise[i]);
571                 pending[i] &= trigger[i];
572                 if (pending[i])
573                         pending_seen = true;
574         }
575 
576         return pending_seen;
577 }
578 
579 static irqreturn_t pca953x_irq_handler(int irq, void *devid)
580 {
581         struct pca953x_chip *chip = devid;
582         u8 pending[MAX_BANK];
583         u8 level;
584         unsigned nhandled = 0;
585         int i;
586 
587         if (!pca953x_irq_pending(chip, pending))
588                 return IRQ_NONE;
589 
590         for (i = 0; i < NBANK(chip); i++) {
591                 while (pending[i]) {
592                         level = __ffs(pending[i]);
593                         handle_nested_irq(irq_find_mapping(chip->gpio_chip.irqdomain,
594                                                         level + (BANK_SZ * i)));
595                         pending[i] &= ~(1 << level);
596                         nhandled++;
597                 }
598         }
599 
600         return (nhandled > 0) ? IRQ_HANDLED : IRQ_NONE;
601 }
602 
603 static int pca953x_irq_setup(struct pca953x_chip *chip,
604                              int irq_base)
605 {
606         struct i2c_client *client = chip->client;
607         int ret, i;
608 
609         if (client->irq && irq_base != -1
610                         && (chip->driver_data & PCA_INT)) {
611                 ret = pca953x_read_regs(chip,
612                                         chip->regs->input, chip->irq_stat);
613                 if (ret)
614                         return ret;
615 
616                 /*
617                  * There is no way to know which GPIO line generated the
618                  * interrupt.  We have to rely on the previous read for
619                  * this purpose.
620                  */
621                 for (i = 0; i < NBANK(chip); i++)
622                         chip->irq_stat[i] &= chip->reg_direction[i];
623                 mutex_init(&chip->irq_lock);
624 
625                 ret = devm_request_threaded_irq(&client->dev,
626                                         client->irq,
627                                            NULL,
628                                            pca953x_irq_handler,
629                                            IRQF_TRIGGER_LOW | IRQF_ONESHOT |
630                                                    IRQF_SHARED,
631                                            dev_name(&client->dev), chip);
632                 if (ret) {
633                         dev_err(&client->dev, "failed to request irq %d\n",
634                                 client->irq);
635                         return ret;
636                 }
637 
638                 ret =  gpiochip_irqchip_add(&chip->gpio_chip,
639                                             &pca953x_irq_chip,
640                                             irq_base,
641                                             handle_simple_irq,
642                                             IRQ_TYPE_NONE);
643                 if (ret) {
644                         dev_err(&client->dev,
645                                 "could not connect irqchip to gpiochip\n");
646                         return ret;
647                 }
648 
649                 gpiochip_set_chained_irqchip(&chip->gpio_chip,
650                                              &pca953x_irq_chip,
651                                              client->irq, NULL);
652         }
653 
654         return 0;
655 }
656 
657 #else /* CONFIG_GPIO_PCA953X_IRQ */
658 static int pca953x_irq_setup(struct pca953x_chip *chip,
659                              int irq_base)
660 {
661         struct i2c_client *client = chip->client;
662 
663         if (irq_base != -1 && (chip->driver_data & PCA_INT))
664                 dev_warn(&client->dev, "interrupt support not compiled in\n");
665 
666         return 0;
667 }
668 #endif
669 
670 static int device_pca953x_init(struct pca953x_chip *chip, u32 invert)
671 {
672         int ret;
673         u8 val[MAX_BANK];
674 
675         chip->regs = &pca953x_regs;
676 
677         ret = pca953x_read_regs(chip, chip->regs->output, chip->reg_output);
678         if (ret)
679                 goto out;
680 
681         ret = pca953x_read_regs(chip, chip->regs->direction,
682                                 chip->reg_direction);
683         if (ret)
684                 goto out;
685 
686         /* set platform specific polarity inversion */
687         if (invert)
688                 memset(val, 0xFF, NBANK(chip));
689         else
690                 memset(val, 0, NBANK(chip));
691 
692         ret = pca953x_write_regs(chip, PCA953X_INVERT, val);
693 out:
694         return ret;
695 }
696 
697 static int device_pca957x_init(struct pca953x_chip *chip, u32 invert)
698 {
699         int ret;
700         u8 val[MAX_BANK];
701 
702         chip->regs = &pca957x_regs;
703 
704         ret = pca953x_read_regs(chip, chip->regs->output, chip->reg_output);
705         if (ret)
706                 goto out;
707         ret = pca953x_read_regs(chip, chip->regs->direction,
708                                 chip->reg_direction);
709         if (ret)
710                 goto out;
711 
712         /* set platform specific polarity inversion */
713         if (invert)
714                 memset(val, 0xFF, NBANK(chip));
715         else
716                 memset(val, 0, NBANK(chip));
717         ret = pca953x_write_regs(chip, PCA957X_INVRT, val);
718         if (ret)
719                 goto out;
720 
721         /* To enable register 6, 7 to control pull up and pull down */
722         memset(val, 0x02, NBANK(chip));
723         ret = pca953x_write_regs(chip, PCA957X_BKEN, val);
724         if (ret)
725                 goto out;
726 
727         return 0;
728 out:
729         return ret;
730 }
731 
732 static const struct of_device_id pca953x_dt_ids[];
733 
734 static int pca953x_probe(struct i2c_client *client,
735                                    const struct i2c_device_id *i2c_id)
736 {
737         struct pca953x_platform_data *pdata;
738         struct pca953x_chip *chip;
739         int irq_base = 0;
740         int ret;
741         u32 invert = 0;
742         struct regulator *reg;
743 
744         chip = devm_kzalloc(&client->dev,
745                         sizeof(struct pca953x_chip), GFP_KERNEL);
746         if (chip == NULL)
747                 return -ENOMEM;
748 
749         pdata = dev_get_platdata(&client->dev);
750         if (pdata) {
751                 irq_base = pdata->irq_base;
752                 chip->gpio_start = pdata->gpio_base;
753                 invert = pdata->invert;
754                 chip->names = pdata->names;
755         } else {
756                 chip->gpio_start = -1;
757                 irq_base = 0;
758         }
759 
760         chip->client = client;
761 
762         reg = devm_regulator_get(&client->dev, "vcc");
763         if (IS_ERR(reg)) {
764                 ret = PTR_ERR(reg);
765                 if (ret != -EPROBE_DEFER)
766                         dev_err(&client->dev, "reg get err: %d\n", ret);
767                 return ret;
768         }
769         ret = regulator_enable(reg);
770         if (ret) {
771                 dev_err(&client->dev, "reg en err: %d\n", ret);
772                 return ret;
773         }
774         chip->regulator = reg;
775 
776         if (i2c_id) {
777                 chip->driver_data = i2c_id->driver_data;
778         } else {
779                 const struct acpi_device_id *acpi_id;
780                 const struct of_device_id *match;
781 
782                 match = of_match_device(pca953x_dt_ids, &client->dev);
783                 if (match) {
784                         chip->driver_data = (int)(uintptr_t)match->data;
785                 } else {
786                         acpi_id = acpi_match_device(pca953x_acpi_ids, &client->dev);
787                         if (!acpi_id) {
788                                 ret = -ENODEV;
789                                 goto err_exit;
790                         }
791 
792                         chip->driver_data = acpi_id->driver_data;
793                 }
794         }
795 
796         mutex_init(&chip->i2c_lock);
797         /*
798          * In case we have an i2c-mux controlled by a GPIO provided by an
799          * expander using the same driver higher on the device tree, read the
800          * i2c adapter nesting depth and use the retrieved value as lockdep
801          * subclass for chip->i2c_lock.
802          *
803          * REVISIT: This solution is not complete. It protects us from lockdep
804          * false positives when the expander controlling the i2c-mux is on
805          * a different level on the device tree, but not when it's on the same
806          * level on a different branch (in which case the subclass number
807          * would be the same).
808          *
809          * TODO: Once a correct solution is developed, a similar fix should be
810          * applied to all other i2c-controlled GPIO expanders (and potentially
811          * regmap-i2c).
812          */
813         lockdep_set_subclass(&chip->i2c_lock,
814                              i2c_adapter_depth(client->adapter));
815 
816         /* initialize cached registers from their original values.
817          * we can't share this chip with another i2c master.
818          */
819         pca953x_setup_gpio(chip, chip->driver_data & PCA_GPIO_MASK);
820 
821         if (chip->gpio_chip.ngpio <= 8) {
822                 chip->write_regs = pca953x_write_regs_8;
823                 chip->read_regs = pca953x_read_regs_8;
824         } else if (chip->gpio_chip.ngpio >= 24) {
825                 chip->write_regs = pca953x_write_regs_24;
826                 chip->read_regs = pca953x_read_regs_24;
827         } else {
828                 if (PCA_CHIP_TYPE(chip->driver_data) == PCA953X_TYPE)
829                         chip->write_regs = pca953x_write_regs_16;
830                 else
831                         chip->write_regs = pca957x_write_regs_16;
832                 chip->read_regs = pca953x_read_regs_16;
833         }
834 
835         if (PCA_CHIP_TYPE(chip->driver_data) == PCA953X_TYPE)
836                 ret = device_pca953x_init(chip, invert);
837         else
838                 ret = device_pca957x_init(chip, invert);
839         if (ret)
840                 goto err_exit;
841 
842         ret = devm_gpiochip_add_data(&client->dev, &chip->gpio_chip, chip);
843         if (ret)
844                 goto err_exit;
845 
846         ret = pca953x_irq_setup(chip, irq_base);
847         if (ret)
848                 goto err_exit;
849 
850         if (pdata && pdata->setup) {
851                 ret = pdata->setup(client, chip->gpio_chip.base,
852                                 chip->gpio_chip.ngpio, pdata->context);
853                 if (ret < 0)
854                         dev_warn(&client->dev, "setup failed, %d\n", ret);
855         }
856 
857         i2c_set_clientdata(client, chip);
858         return 0;
859 
860 err_exit:
861         regulator_disable(chip->regulator);
862         return ret;
863 }
864 
865 static int pca953x_remove(struct i2c_client *client)
866 {
867         struct pca953x_platform_data *pdata = dev_get_platdata(&client->dev);
868         struct pca953x_chip *chip = i2c_get_clientdata(client);
869         int ret;
870 
871         if (pdata && pdata->teardown) {
872                 ret = pdata->teardown(client, chip->gpio_chip.base,
873                                 chip->gpio_chip.ngpio, pdata->context);
874                 if (ret < 0)
875                         dev_err(&client->dev, "%s failed, %d\n",
876                                         "teardown", ret);
877         } else {
878                 ret = 0;
879         }
880 
881         regulator_disable(chip->regulator);
882 
883         return ret;
884 }
885 
886 /* convenience to stop overlong match-table lines */
887 #define OF_953X(__nrgpio, __int) (void *)(__nrgpio | PCA953X_TYPE | __int)
888 #define OF_957X(__nrgpio, __int) (void *)(__nrgpio | PCA957X_TYPE | __int)
889 
890 static const struct of_device_id pca953x_dt_ids[] = {
891         { .compatible = "nxp,pca9505", .data = OF_953X(40, PCA_INT), },
892         { .compatible = "nxp,pca9534", .data = OF_953X( 8, PCA_INT), },
893         { .compatible = "nxp,pca9535", .data = OF_953X(16, PCA_INT), },
894         { .compatible = "nxp,pca9536", .data = OF_953X( 4, 0), },
895         { .compatible = "nxp,pca9537", .data = OF_953X( 4, PCA_INT), },
896         { .compatible = "nxp,pca9538", .data = OF_953X( 8, PCA_INT), },
897         { .compatible = "nxp,pca9539", .data = OF_953X(16, PCA_INT), },
898         { .compatible = "nxp,pca9554", .data = OF_953X( 8, PCA_INT), },
899         { .compatible = "nxp,pca9555", .data = OF_953X(16, PCA_INT), },
900         { .compatible = "nxp,pca9556", .data = OF_953X( 8, 0), },
901         { .compatible = "nxp,pca9557", .data = OF_953X( 8, 0), },
902         { .compatible = "nxp,pca9574", .data = OF_957X( 8, PCA_INT), },
903         { .compatible = "nxp,pca9575", .data = OF_957X(16, PCA_INT), },
904         { .compatible = "nxp,pca9698", .data = OF_953X(40, 0), },
905 
906         { .compatible = "maxim,max7310", .data = OF_953X( 8, 0), },
907         { .compatible = "maxim,max7312", .data = OF_953X(16, PCA_INT), },
908         { .compatible = "maxim,max7313", .data = OF_953X(16, PCA_INT), },
909         { .compatible = "maxim,max7315", .data = OF_953X( 8, PCA_INT), },
910 
911         { .compatible = "ti,pca6107", .data = OF_953X( 8, PCA_INT), },
912         { .compatible = "ti,pca9536", .data = OF_953X( 4, 0), },
913         { .compatible = "ti,tca6408", .data = OF_953X( 8, PCA_INT), },
914         { .compatible = "ti,tca6416", .data = OF_953X(16, PCA_INT), },
915         { .compatible = "ti,tca6424", .data = OF_953X(24, PCA_INT), },
916 
917         { .compatible = "onsemi,pca9654", .data = OF_953X( 8, PCA_INT), },
918 
919         { .compatible = "exar,xra1202", .data = OF_953X( 8, 0), },
920         { }
921 };
922 
923 MODULE_DEVICE_TABLE(of, pca953x_dt_ids);
924 
925 static struct i2c_driver pca953x_driver = {
926         .driver = {
927                 .name   = "pca953x",
928                 .of_match_table = pca953x_dt_ids,
929                 .acpi_match_table = ACPI_PTR(pca953x_acpi_ids),
930         },
931         .probe          = pca953x_probe,
932         .remove         = pca953x_remove,
933         .id_table       = pca953x_id,
934 };
935 
936 static int __init pca953x_init(void)
937 {
938         return i2c_add_driver(&pca953x_driver);
939 }
940 /* register after i2c postcore initcall and before
941  * subsys initcalls that may rely on these GPIOs
942  */
943 subsys_initcall(pca953x_init);
944 
945 static void __exit pca953x_exit(void)
946 {
947         i2c_del_driver(&pca953x_driver);
948 }
949 module_exit(pca953x_exit);
950 
951 MODULE_AUTHOR("eric miao <eric.miao@marvell.com>");
952 MODULE_DESCRIPTION("GPIO expander driver for PCA953x");
953 MODULE_LICENSE("GPL");
954 

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