Version:  2.0.40 2.2.26 2.4.37 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 4.10

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         { "max7318", 16 | PCA953X_TYPE | PCA_INT, },
 78         { "pca6107", 8  | PCA953X_TYPE | PCA_INT, },
 79         { "tca6408", 8  | PCA953X_TYPE | PCA_INT, },
 80         { "tca6416", 16 | PCA953X_TYPE | PCA_INT, },
 81         { "tca6424", 24 | PCA953X_TYPE | PCA_INT, },
 82         { "tca9539", 16 | PCA953X_TYPE | PCA_INT, },
 83         { "xra1202", 8  | PCA953X_TYPE },
 84         { }
 85 };
 86 MODULE_DEVICE_TABLE(i2c, pca953x_id);
 87 
 88 static const struct acpi_device_id pca953x_acpi_ids[] = {
 89         { "INT3491", 16 | PCA953X_TYPE | PCA_INT | PCA_PCAL, },
 90         { }
 91 };
 92 MODULE_DEVICE_TABLE(acpi, pca953x_acpi_ids);
 93 
 94 #define MAX_BANK 5
 95 #define BANK_SZ 8
 96 
 97 #define NBANK(chip) DIV_ROUND_UP(chip->gpio_chip.ngpio, BANK_SZ)
 98 
 99 struct pca953x_reg_config {
100         int direction;
101         int output;
102         int input;
103 };
104 
105 static const struct pca953x_reg_config pca953x_regs = {
106         .direction = PCA953X_DIRECTION,
107         .output = PCA953X_OUTPUT,
108         .input = PCA953X_INPUT,
109 };
110 
111 static const struct pca953x_reg_config pca957x_regs = {
112         .direction = PCA957X_CFG,
113         .output = PCA957X_OUT,
114         .input = PCA957X_IN,
115 };
116 
117 struct pca953x_chip {
118         unsigned gpio_start;
119         u8 reg_output[MAX_BANK];
120         u8 reg_direction[MAX_BANK];
121         struct mutex i2c_lock;
122 
123 #ifdef CONFIG_GPIO_PCA953X_IRQ
124         struct mutex irq_lock;
125         u8 irq_mask[MAX_BANK];
126         u8 irq_stat[MAX_BANK];
127         u8 irq_trig_raise[MAX_BANK];
128         u8 irq_trig_fall[MAX_BANK];
129 #endif
130 
131         struct i2c_client *client;
132         struct gpio_chip gpio_chip;
133         const char *const *names;
134         unsigned long driver_data;
135         struct regulator *regulator;
136 
137         const struct pca953x_reg_config *regs;
138 
139         int (*write_regs)(struct pca953x_chip *, int, u8 *);
140         int (*read_regs)(struct pca953x_chip *, int, u8 *);
141 };
142 
143 static int pca953x_read_single(struct pca953x_chip *chip, int reg, u32 *val,
144                                 int off)
145 {
146         int ret;
147         int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
148         int offset = off / BANK_SZ;
149 
150         ret = i2c_smbus_read_byte_data(chip->client,
151                                 (reg << bank_shift) + offset);
152         *val = ret;
153 
154         if (ret < 0) {
155                 dev_err(&chip->client->dev, "failed reading register\n");
156                 return ret;
157         }
158 
159         return 0;
160 }
161 
162 static int pca953x_write_single(struct pca953x_chip *chip, int reg, u32 val,
163                                 int off)
164 {
165         int ret;
166         int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
167         int offset = off / BANK_SZ;
168 
169         ret = i2c_smbus_write_byte_data(chip->client,
170                                         (reg << bank_shift) + offset, val);
171 
172         if (ret < 0) {
173                 dev_err(&chip->client->dev, "failed writing register\n");
174                 return ret;
175         }
176 
177         return 0;
178 }
179 
180 static int pca953x_write_regs_8(struct pca953x_chip *chip, int reg, u8 *val)
181 {
182         return i2c_smbus_write_byte_data(chip->client, reg, *val);
183 }
184 
185 static int pca953x_write_regs_16(struct pca953x_chip *chip, int reg, u8 *val)
186 {
187         __le16 word = cpu_to_le16(get_unaligned((u16 *)val));
188 
189         return i2c_smbus_write_word_data(chip->client,
190                                          reg << 1, (__force u16)word);
191 }
192 
193 static int pca957x_write_regs_16(struct pca953x_chip *chip, int reg, u8 *val)
194 {
195         int ret;
196 
197         ret = i2c_smbus_write_byte_data(chip->client, reg << 1, val[0]);
198         if (ret < 0)
199                 return ret;
200 
201         return i2c_smbus_write_byte_data(chip->client, (reg << 1) + 1, val[1]);
202 }
203 
204 static int pca953x_write_regs_24(struct pca953x_chip *chip, int reg, u8 *val)
205 {
206         int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
207 
208         return i2c_smbus_write_i2c_block_data(chip->client,
209                                               (reg << bank_shift) | REG_ADDR_AI,
210                                               NBANK(chip), val);
211 }
212 
213 static int pca953x_write_regs(struct pca953x_chip *chip, int reg, u8 *val)
214 {
215         int ret = 0;
216 
217         ret = chip->write_regs(chip, reg, val);
218         if (ret < 0) {
219                 dev_err(&chip->client->dev, "failed writing register\n");
220                 return ret;
221         }
222 
223         return 0;
224 }
225 
226 static int pca953x_read_regs_8(struct pca953x_chip *chip, int reg, u8 *val)
227 {
228         int ret;
229 
230         ret = i2c_smbus_read_byte_data(chip->client, reg);
231         *val = ret;
232 
233         return ret;
234 }
235 
236 static int pca953x_read_regs_16(struct pca953x_chip *chip, int reg, u8 *val)
237 {
238         int ret;
239 
240         ret = i2c_smbus_read_word_data(chip->client, reg << 1);
241         val[0] = (u16)ret & 0xFF;
242         val[1] = (u16)ret >> 8;
243 
244         return ret;
245 }
246 
247 static int pca953x_read_regs_24(struct pca953x_chip *chip, int reg, u8 *val)
248 {
249         int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
250 
251         return i2c_smbus_read_i2c_block_data(chip->client,
252                                              (reg << bank_shift) | REG_ADDR_AI,
253                                              NBANK(chip), val);
254 }
255 
256 static int pca953x_read_regs(struct pca953x_chip *chip, int reg, u8 *val)
257 {
258         int ret;
259 
260         ret = chip->read_regs(chip, reg, val);
261         if (ret < 0) {
262                 dev_err(&chip->client->dev, "failed reading register\n");
263                 return ret;
264         }
265 
266         return 0;
267 }
268 
269 static int pca953x_gpio_direction_input(struct gpio_chip *gc, unsigned off)
270 {
271         struct pca953x_chip *chip = gpiochip_get_data(gc);
272         u8 reg_val;
273         int ret;
274 
275         mutex_lock(&chip->i2c_lock);
276         reg_val = chip->reg_direction[off / BANK_SZ] | (1u << (off % BANK_SZ));
277 
278         ret = pca953x_write_single(chip, chip->regs->direction, reg_val, off);
279         if (ret)
280                 goto exit;
281 
282         chip->reg_direction[off / BANK_SZ] = reg_val;
283 exit:
284         mutex_unlock(&chip->i2c_lock);
285         return ret;
286 }
287 
288 static int pca953x_gpio_direction_output(struct gpio_chip *gc,
289                 unsigned off, int val)
290 {
291         struct pca953x_chip *chip = gpiochip_get_data(gc);
292         u8 reg_val;
293         int ret;
294 
295         mutex_lock(&chip->i2c_lock);
296         /* set output level */
297         if (val)
298                 reg_val = chip->reg_output[off / BANK_SZ]
299                         | (1u << (off % BANK_SZ));
300         else
301                 reg_val = chip->reg_output[off / BANK_SZ]
302                         & ~(1u << (off % BANK_SZ));
303 
304         ret = pca953x_write_single(chip, chip->regs->output, reg_val, off);
305         if (ret)
306                 goto exit;
307 
308         chip->reg_output[off / BANK_SZ] = reg_val;
309 
310         /* then direction */
311         reg_val = chip->reg_direction[off / BANK_SZ] & ~(1u << (off % BANK_SZ));
312         ret = pca953x_write_single(chip, chip->regs->direction, reg_val, off);
313         if (ret)
314                 goto exit;
315 
316         chip->reg_direction[off / BANK_SZ] = reg_val;
317 exit:
318         mutex_unlock(&chip->i2c_lock);
319         return ret;
320 }
321 
322 static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off)
323 {
324         struct pca953x_chip *chip = gpiochip_get_data(gc);
325         u32 reg_val;
326         int ret;
327 
328         mutex_lock(&chip->i2c_lock);
329         ret = pca953x_read_single(chip, chip->regs->input, &reg_val, off);
330         mutex_unlock(&chip->i2c_lock);
331         if (ret < 0) {
332                 /* NOTE:  diagnostic already emitted; that's all we should
333                  * do unless gpio_*_value_cansleep() calls become different
334                  * from their nonsleeping siblings (and report faults).
335                  */
336                 return 0;
337         }
338 
339         return (reg_val & (1u << (off % BANK_SZ))) ? 1 : 0;
340 }
341 
342 static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val)
343 {
344         struct pca953x_chip *chip = gpiochip_get_data(gc);
345         u8 reg_val;
346         int ret;
347 
348         mutex_lock(&chip->i2c_lock);
349         if (val)
350                 reg_val = chip->reg_output[off / BANK_SZ]
351                         | (1u << (off % BANK_SZ));
352         else
353                 reg_val = chip->reg_output[off / BANK_SZ]
354                         & ~(1u << (off % BANK_SZ));
355 
356         ret = pca953x_write_single(chip, chip->regs->output, reg_val, off);
357         if (ret)
358                 goto exit;
359 
360         chip->reg_output[off / BANK_SZ] = reg_val;
361 exit:
362         mutex_unlock(&chip->i2c_lock);
363 }
364 
365 static void pca953x_gpio_set_multiple(struct gpio_chip *gc,
366                                       unsigned long *mask, unsigned long *bits)
367 {
368         struct pca953x_chip *chip = gpiochip_get_data(gc);
369         unsigned int bank_mask, bank_val;
370         int bank_shift, bank;
371         u8 reg_val[MAX_BANK];
372         int ret;
373 
374         bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
375 
376         mutex_lock(&chip->i2c_lock);
377         memcpy(reg_val, chip->reg_output, NBANK(chip));
378         for (bank = 0; bank < NBANK(chip); bank++) {
379                 bank_mask = mask[bank / sizeof(*mask)] >>
380                            ((bank % sizeof(*mask)) * 8);
381                 if (bank_mask) {
382                         bank_val = bits[bank / sizeof(*bits)] >>
383                                   ((bank % sizeof(*bits)) * 8);
384                         bank_val &= bank_mask;
385                         reg_val[bank] = (reg_val[bank] & ~bank_mask) | bank_val;
386                 }
387         }
388 
389         ret = i2c_smbus_write_i2c_block_data(chip->client,
390                                              chip->regs->output << bank_shift,
391                                              NBANK(chip), reg_val);
392         if (ret)
393                 goto exit;
394 
395         memcpy(chip->reg_output, reg_val, NBANK(chip));
396 exit:
397         mutex_unlock(&chip->i2c_lock);
398 }
399 
400 static void pca953x_setup_gpio(struct pca953x_chip *chip, int gpios)
401 {
402         struct gpio_chip *gc;
403 
404         gc = &chip->gpio_chip;
405 
406         gc->direction_input  = pca953x_gpio_direction_input;
407         gc->direction_output = pca953x_gpio_direction_output;
408         gc->get = pca953x_gpio_get_value;
409         gc->set = pca953x_gpio_set_value;
410         gc->set_multiple = pca953x_gpio_set_multiple;
411         gc->can_sleep = true;
412 
413         gc->base = chip->gpio_start;
414         gc->ngpio = gpios;
415         gc->label = chip->client->name;
416         gc->parent = &chip->client->dev;
417         gc->owner = THIS_MODULE;
418         gc->names = chip->names;
419 }
420 
421 #ifdef CONFIG_GPIO_PCA953X_IRQ
422 static void pca953x_irq_mask(struct irq_data *d)
423 {
424         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
425         struct pca953x_chip *chip = gpiochip_get_data(gc);
426 
427         chip->irq_mask[d->hwirq / BANK_SZ] &= ~(1 << (d->hwirq % BANK_SZ));
428 }
429 
430 static void pca953x_irq_unmask(struct irq_data *d)
431 {
432         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
433         struct pca953x_chip *chip = gpiochip_get_data(gc);
434 
435         chip->irq_mask[d->hwirq / BANK_SZ] |= 1 << (d->hwirq % BANK_SZ);
436 }
437 
438 static void pca953x_irq_bus_lock(struct irq_data *d)
439 {
440         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
441         struct pca953x_chip *chip = gpiochip_get_data(gc);
442 
443         mutex_lock(&chip->irq_lock);
444 }
445 
446 static void pca953x_irq_bus_sync_unlock(struct irq_data *d)
447 {
448         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
449         struct pca953x_chip *chip = gpiochip_get_data(gc);
450         u8 new_irqs;
451         int level, i;
452         u8 invert_irq_mask[MAX_BANK];
453 
454         if (chip->driver_data & PCA_PCAL) {
455                 /* Enable latch on interrupt-enabled inputs */
456                 pca953x_write_regs(chip, PCAL953X_IN_LATCH, chip->irq_mask);
457 
458                 for (i = 0; i < NBANK(chip); i++)
459                         invert_irq_mask[i] = ~chip->irq_mask[i];
460 
461                 /* Unmask enabled interrupts */
462                 pca953x_write_regs(chip, PCAL953X_INT_MASK, invert_irq_mask);
463         }
464 
465         /* Look for any newly setup interrupt */
466         for (i = 0; i < NBANK(chip); i++) {
467                 new_irqs = chip->irq_trig_fall[i] | chip->irq_trig_raise[i];
468                 new_irqs &= ~chip->reg_direction[i];
469 
470                 while (new_irqs) {
471                         level = __ffs(new_irqs);
472                         pca953x_gpio_direction_input(&chip->gpio_chip,
473                                                         level + (BANK_SZ * i));
474                         new_irqs &= ~(1 << level);
475                 }
476         }
477 
478         mutex_unlock(&chip->irq_lock);
479 }
480 
481 static int pca953x_irq_set_type(struct irq_data *d, unsigned int type)
482 {
483         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
484         struct pca953x_chip *chip = gpiochip_get_data(gc);
485         int bank_nb = d->hwirq / BANK_SZ;
486         u8 mask = 1 << (d->hwirq % BANK_SZ);
487 
488         if (!(type & IRQ_TYPE_EDGE_BOTH)) {
489                 dev_err(&chip->client->dev, "irq %d: unsupported type %d\n",
490                         d->irq, type);
491                 return -EINVAL;
492         }
493 
494         if (type & IRQ_TYPE_EDGE_FALLING)
495                 chip->irq_trig_fall[bank_nb] |= mask;
496         else
497                 chip->irq_trig_fall[bank_nb] &= ~mask;
498 
499         if (type & IRQ_TYPE_EDGE_RISING)
500                 chip->irq_trig_raise[bank_nb] |= mask;
501         else
502                 chip->irq_trig_raise[bank_nb] &= ~mask;
503 
504         return 0;
505 }
506 
507 static struct irq_chip pca953x_irq_chip = {
508         .name                   = "pca953x",
509         .irq_mask               = pca953x_irq_mask,
510         .irq_unmask             = pca953x_irq_unmask,
511         .irq_bus_lock           = pca953x_irq_bus_lock,
512         .irq_bus_sync_unlock    = pca953x_irq_bus_sync_unlock,
513         .irq_set_type           = pca953x_irq_set_type,
514 };
515 
516 static bool pca953x_irq_pending(struct pca953x_chip *chip, u8 *pending)
517 {
518         u8 cur_stat[MAX_BANK];
519         u8 old_stat[MAX_BANK];
520         bool pending_seen = false;
521         bool trigger_seen = false;
522         u8 trigger[MAX_BANK];
523         int ret, i;
524 
525         if (chip->driver_data & PCA_PCAL) {
526                 /* Read the current interrupt status from the device */
527                 ret = pca953x_read_regs(chip, PCAL953X_INT_STAT, trigger);
528                 if (ret)
529                         return false;
530 
531                 /* Check latched inputs and clear interrupt status */
532                 ret = pca953x_read_regs(chip, PCA953X_INPUT, cur_stat);
533                 if (ret)
534                         return false;
535 
536                 for (i = 0; i < NBANK(chip); i++) {
537                         /* Apply filter for rising/falling edge selection */
538                         pending[i] = (~cur_stat[i] & chip->irq_trig_fall[i]) |
539                                 (cur_stat[i] & chip->irq_trig_raise[i]);
540                         pending[i] &= trigger[i];
541                         if (pending[i])
542                                 pending_seen = true;
543                 }
544 
545                 return pending_seen;
546         }
547 
548         ret = pca953x_read_regs(chip, chip->regs->input, cur_stat);
549         if (ret)
550                 return false;
551 
552         /* Remove output pins from the equation */
553         for (i = 0; i < NBANK(chip); i++)
554                 cur_stat[i] &= chip->reg_direction[i];
555 
556         memcpy(old_stat, chip->irq_stat, NBANK(chip));
557 
558         for (i = 0; i < NBANK(chip); i++) {
559                 trigger[i] = (cur_stat[i] ^ old_stat[i]) & chip->irq_mask[i];
560                 if (trigger[i])
561                         trigger_seen = true;
562         }
563 
564         if (!trigger_seen)
565                 return false;
566 
567         memcpy(chip->irq_stat, cur_stat, NBANK(chip));
568 
569         for (i = 0; i < NBANK(chip); i++) {
570                 pending[i] = (old_stat[i] & chip->irq_trig_fall[i]) |
571                         (cur_stat[i] & chip->irq_trig_raise[i]);
572                 pending[i] &= trigger[i];
573                 if (pending[i])
574                         pending_seen = true;
575         }
576 
577         return pending_seen;
578 }
579 
580 static irqreturn_t pca953x_irq_handler(int irq, void *devid)
581 {
582         struct pca953x_chip *chip = devid;
583         u8 pending[MAX_BANK];
584         u8 level;
585         unsigned nhandled = 0;
586         int i;
587 
588         if (!pca953x_irq_pending(chip, pending))
589                 return IRQ_NONE;
590 
591         for (i = 0; i < NBANK(chip); i++) {
592                 while (pending[i]) {
593                         level = __ffs(pending[i]);
594                         handle_nested_irq(irq_find_mapping(chip->gpio_chip.irqdomain,
595                                                         level + (BANK_SZ * i)));
596                         pending[i] &= ~(1 << level);
597                         nhandled++;
598                 }
599         }
600 
601         return (nhandled > 0) ? IRQ_HANDLED : IRQ_NONE;
602 }
603 
604 static int pca953x_irq_setup(struct pca953x_chip *chip,
605                              int irq_base)
606 {
607         struct i2c_client *client = chip->client;
608         int ret, i;
609 
610         if (client->irq && irq_base != -1
611                         && (chip->driver_data & PCA_INT)) {
612                 ret = pca953x_read_regs(chip,
613                                         chip->regs->input, chip->irq_stat);
614                 if (ret)
615                         return ret;
616 
617                 /*
618                  * There is no way to know which GPIO line generated the
619                  * interrupt.  We have to rely on the previous read for
620                  * this purpose.
621                  */
622                 for (i = 0; i < NBANK(chip); i++)
623                         chip->irq_stat[i] &= chip->reg_direction[i];
624                 mutex_init(&chip->irq_lock);
625 
626                 ret = devm_request_threaded_irq(&client->dev,
627                                         client->irq,
628                                            NULL,
629                                            pca953x_irq_handler,
630                                            IRQF_TRIGGER_LOW | IRQF_ONESHOT |
631                                                    IRQF_SHARED,
632                                            dev_name(&client->dev), chip);
633                 if (ret) {
634                         dev_err(&client->dev, "failed to request irq %d\n",
635                                 client->irq);
636                         return ret;
637                 }
638 
639                 ret =  gpiochip_irqchip_add_nested(&chip->gpio_chip,
640                                                    &pca953x_irq_chip,
641                                                    irq_base,
642                                                    handle_simple_irq,
643                                                    IRQ_TYPE_NONE);
644                 if (ret) {
645                         dev_err(&client->dev,
646                                 "could not connect irqchip to gpiochip\n");
647                         return ret;
648                 }
649 
650                 gpiochip_set_nested_irqchip(&chip->gpio_chip,
651                                             &pca953x_irq_chip,
652                                             client->irq);
653         }
654 
655         return 0;
656 }
657 
658 #else /* CONFIG_GPIO_PCA953X_IRQ */
659 static int pca953x_irq_setup(struct pca953x_chip *chip,
660                              int irq_base)
661 {
662         struct i2c_client *client = chip->client;
663 
664         if (irq_base != -1 && (chip->driver_data & PCA_INT))
665                 dev_warn(&client->dev, "interrupt support not compiled in\n");
666 
667         return 0;
668 }
669 #endif
670 
671 static int device_pca953x_init(struct pca953x_chip *chip, u32 invert)
672 {
673         int ret;
674         u8 val[MAX_BANK];
675 
676         chip->regs = &pca953x_regs;
677 
678         ret = pca953x_read_regs(chip, chip->regs->output, chip->reg_output);
679         if (ret)
680                 goto out;
681 
682         ret = pca953x_read_regs(chip, chip->regs->direction,
683                                 chip->reg_direction);
684         if (ret)
685                 goto out;
686 
687         /* set platform specific polarity inversion */
688         if (invert)
689                 memset(val, 0xFF, NBANK(chip));
690         else
691                 memset(val, 0, NBANK(chip));
692 
693         ret = pca953x_write_regs(chip, PCA953X_INVERT, val);
694 out:
695         return ret;
696 }
697 
698 static int device_pca957x_init(struct pca953x_chip *chip, u32 invert)
699 {
700         int ret;
701         u8 val[MAX_BANK];
702 
703         chip->regs = &pca957x_regs;
704 
705         ret = pca953x_read_regs(chip, chip->regs->output, chip->reg_output);
706         if (ret)
707                 goto out;
708         ret = pca953x_read_regs(chip, chip->regs->direction,
709                                 chip->reg_direction);
710         if (ret)
711                 goto out;
712 
713         /* set platform specific polarity inversion */
714         if (invert)
715                 memset(val, 0xFF, NBANK(chip));
716         else
717                 memset(val, 0, NBANK(chip));
718         ret = pca953x_write_regs(chip, PCA957X_INVRT, val);
719         if (ret)
720                 goto out;
721 
722         /* To enable register 6, 7 to control pull up and pull down */
723         memset(val, 0x02, NBANK(chip));
724         ret = pca953x_write_regs(chip, PCA957X_BKEN, val);
725         if (ret)
726                 goto out;
727 
728         return 0;
729 out:
730         return ret;
731 }
732 
733 static const struct of_device_id pca953x_dt_ids[];
734 
735 static int pca953x_probe(struct i2c_client *client,
736                                    const struct i2c_device_id *i2c_id)
737 {
738         struct pca953x_platform_data *pdata;
739         struct pca953x_chip *chip;
740         int irq_base = 0;
741         int ret;
742         u32 invert = 0;
743         struct regulator *reg;
744 
745         chip = devm_kzalloc(&client->dev,
746                         sizeof(struct pca953x_chip), GFP_KERNEL);
747         if (chip == NULL)
748                 return -ENOMEM;
749 
750         pdata = dev_get_platdata(&client->dev);
751         if (pdata) {
752                 irq_base = pdata->irq_base;
753                 chip->gpio_start = pdata->gpio_base;
754                 invert = pdata->invert;
755                 chip->names = pdata->names;
756         } else {
757                 chip->gpio_start = -1;
758                 irq_base = 0;
759         }
760 
761         chip->client = client;
762 
763         reg = devm_regulator_get(&client->dev, "vcc");
764         if (IS_ERR(reg)) {
765                 ret = PTR_ERR(reg);
766                 if (ret != -EPROBE_DEFER)
767                         dev_err(&client->dev, "reg get err: %d\n", ret);
768                 return ret;
769         }
770         ret = regulator_enable(reg);
771         if (ret) {
772                 dev_err(&client->dev, "reg en err: %d\n", ret);
773                 return ret;
774         }
775         chip->regulator = reg;
776 
777         if (i2c_id) {
778                 chip->driver_data = i2c_id->driver_data;
779         } else {
780                 const struct acpi_device_id *acpi_id;
781                 const struct of_device_id *match;
782 
783                 match = of_match_device(pca953x_dt_ids, &client->dev);
784                 if (match) {
785                         chip->driver_data = (int)(uintptr_t)match->data;
786                 } else {
787                         acpi_id = acpi_match_device(pca953x_acpi_ids, &client->dev);
788                         if (!acpi_id) {
789                                 ret = -ENODEV;
790                                 goto err_exit;
791                         }
792 
793                         chip->driver_data = acpi_id->driver_data;
794                 }
795         }
796 
797         mutex_init(&chip->i2c_lock);
798         /*
799          * In case we have an i2c-mux controlled by a GPIO provided by an
800          * expander using the same driver higher on the device tree, read the
801          * i2c adapter nesting depth and use the retrieved value as lockdep
802          * subclass for chip->i2c_lock.
803          *
804          * REVISIT: This solution is not complete. It protects us from lockdep
805          * false positives when the expander controlling the i2c-mux is on
806          * a different level on the device tree, but not when it's on the same
807          * level on a different branch (in which case the subclass number
808          * would be the same).
809          *
810          * TODO: Once a correct solution is developed, a similar fix should be
811          * applied to all other i2c-controlled GPIO expanders (and potentially
812          * regmap-i2c).
813          */
814         lockdep_set_subclass(&chip->i2c_lock,
815                              i2c_adapter_depth(client->adapter));
816 
817         /* initialize cached registers from their original values.
818          * we can't share this chip with another i2c master.
819          */
820         pca953x_setup_gpio(chip, chip->driver_data & PCA_GPIO_MASK);
821 
822         if (chip->gpio_chip.ngpio <= 8) {
823                 chip->write_regs = pca953x_write_regs_8;
824                 chip->read_regs = pca953x_read_regs_8;
825         } else if (chip->gpio_chip.ngpio >= 24) {
826                 chip->write_regs = pca953x_write_regs_24;
827                 chip->read_regs = pca953x_read_regs_24;
828         } else {
829                 if (PCA_CHIP_TYPE(chip->driver_data) == PCA953X_TYPE)
830                         chip->write_regs = pca953x_write_regs_16;
831                 else
832                         chip->write_regs = pca957x_write_regs_16;
833                 chip->read_regs = pca953x_read_regs_16;
834         }
835 
836         if (PCA_CHIP_TYPE(chip->driver_data) == PCA953X_TYPE)
837                 ret = device_pca953x_init(chip, invert);
838         else
839                 ret = device_pca957x_init(chip, invert);
840         if (ret)
841                 goto err_exit;
842 
843         ret = devm_gpiochip_add_data(&client->dev, &chip->gpio_chip, chip);
844         if (ret)
845                 goto err_exit;
846 
847         ret = pca953x_irq_setup(chip, irq_base);
848         if (ret)
849                 goto err_exit;
850 
851         if (pdata && pdata->setup) {
852                 ret = pdata->setup(client, chip->gpio_chip.base,
853                                 chip->gpio_chip.ngpio, pdata->context);
854                 if (ret < 0)
855                         dev_warn(&client->dev, "setup failed, %d\n", ret);
856         }
857 
858         i2c_set_clientdata(client, chip);
859         return 0;
860 
861 err_exit:
862         regulator_disable(chip->regulator);
863         return ret;
864 }
865 
866 static int pca953x_remove(struct i2c_client *client)
867 {
868         struct pca953x_platform_data *pdata = dev_get_platdata(&client->dev);
869         struct pca953x_chip *chip = i2c_get_clientdata(client);
870         int ret;
871 
872         if (pdata && pdata->teardown) {
873                 ret = pdata->teardown(client, chip->gpio_chip.base,
874                                 chip->gpio_chip.ngpio, pdata->context);
875                 if (ret < 0)
876                         dev_err(&client->dev, "%s failed, %d\n",
877                                         "teardown", ret);
878         } else {
879                 ret = 0;
880         }
881 
882         regulator_disable(chip->regulator);
883 
884         return ret;
885 }
886 
887 /* convenience to stop overlong match-table lines */
888 #define OF_953X(__nrgpio, __int) (void *)(__nrgpio | PCA953X_TYPE | __int)
889 #define OF_957X(__nrgpio, __int) (void *)(__nrgpio | PCA957X_TYPE | __int)
890 
891 static const struct of_device_id pca953x_dt_ids[] = {
892         { .compatible = "nxp,pca9505", .data = OF_953X(40, PCA_INT), },
893         { .compatible = "nxp,pca9534", .data = OF_953X( 8, PCA_INT), },
894         { .compatible = "nxp,pca9535", .data = OF_953X(16, PCA_INT), },
895         { .compatible = "nxp,pca9536", .data = OF_953X( 4, 0), },
896         { .compatible = "nxp,pca9537", .data = OF_953X( 4, PCA_INT), },
897         { .compatible = "nxp,pca9538", .data = OF_953X( 8, PCA_INT), },
898         { .compatible = "nxp,pca9539", .data = OF_953X(16, PCA_INT), },
899         { .compatible = "nxp,pca9554", .data = OF_953X( 8, PCA_INT), },
900         { .compatible = "nxp,pca9555", .data = OF_953X(16, PCA_INT), },
901         { .compatible = "nxp,pca9556", .data = OF_953X( 8, 0), },
902         { .compatible = "nxp,pca9557", .data = OF_953X( 8, 0), },
903         { .compatible = "nxp,pca9574", .data = OF_957X( 8, PCA_INT), },
904         { .compatible = "nxp,pca9575", .data = OF_957X(16, PCA_INT), },
905         { .compatible = "nxp,pca9698", .data = OF_953X(40, 0), },
906 
907         { .compatible = "maxim,max7310", .data = OF_953X( 8, 0), },
908         { .compatible = "maxim,max7312", .data = OF_953X(16, PCA_INT), },
909         { .compatible = "maxim,max7313", .data = OF_953X(16, PCA_INT), },
910         { .compatible = "maxim,max7315", .data = OF_953X( 8, PCA_INT), },
911         { .compatible = "maxim,max7318", .data = OF_953X(16, PCA_INT), },
912 
913         { .compatible = "ti,pca6107", .data = OF_953X( 8, PCA_INT), },
914         { .compatible = "ti,pca9536", .data = OF_953X( 4, 0), },
915         { .compatible = "ti,tca6408", .data = OF_953X( 8, PCA_INT), },
916         { .compatible = "ti,tca6416", .data = OF_953X(16, PCA_INT), },
917         { .compatible = "ti,tca6424", .data = OF_953X(24, PCA_INT), },
918 
919         { .compatible = "onsemi,pca9654", .data = OF_953X( 8, PCA_INT), },
920 
921         { .compatible = "exar,xra1202", .data = OF_953X( 8, 0), },
922         { }
923 };
924 
925 MODULE_DEVICE_TABLE(of, pca953x_dt_ids);
926 
927 static struct i2c_driver pca953x_driver = {
928         .driver = {
929                 .name   = "pca953x",
930                 .of_match_table = pca953x_dt_ids,
931                 .acpi_match_table = ACPI_PTR(pca953x_acpi_ids),
932         },
933         .probe          = pca953x_probe,
934         .remove         = pca953x_remove,
935         .id_table       = pca953x_id,
936 };
937 
938 static int __init pca953x_init(void)
939 {
940         return i2c_add_driver(&pca953x_driver);
941 }
942 /* register after i2c postcore initcall and before
943  * subsys initcalls that may rely on these GPIOs
944  */
945 subsys_initcall(pca953x_init);
946 
947 static void __exit pca953x_exit(void)
948 {
949         i2c_del_driver(&pca953x_driver);
950 }
951 module_exit(pca953x_exit);
952 
953 MODULE_AUTHOR("eric miao <eric.miao@marvell.com>");
954 MODULE_DESCRIPTION("GPIO expander driver for PCA953x");
955 MODULE_LICENSE("GPL");
956 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us