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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * PCA953x 4/8/16/24/40 bit I/O ports
4 *
5 * Copyright (C) 2005 Ben Gardner <bgardner@wabtec.com>
6 * Copyright (C) 2007 Marvell International Ltd.
7 *
8 * Derived from drivers/i2c/chips/pca9539.c
9 */
10
11#include <linux/acpi.h>
12#include <linux/bitmap.h>
13#include <linux/gpio/consumer.h>
14#include <linux/gpio/driver.h>
15#include <linux/i2c.h>
16#include <linux/init.h>
17#include <linux/interrupt.h>
18#include <linux/module.h>
19#include <linux/of_platform.h>
20#include <linux/platform_data/pca953x.h>
21#include <linux/regmap.h>
22#include <linux/regulator/consumer.h>
23#include <linux/seq_file.h>
24#include <linux/slab.h>
25
26#include <asm/unaligned.h>
27
28#define PCA953X_INPUT 0x00
29#define PCA953X_OUTPUT 0x01
30#define PCA953X_INVERT 0x02
31#define PCA953X_DIRECTION 0x03
32
33#define REG_ADDR_MASK GENMASK(5, 0)
34#define REG_ADDR_EXT BIT(6)
35#define REG_ADDR_AI BIT(7)
36
37#define PCA957X_IN 0x00
38#define PCA957X_INVRT 0x01
39#define PCA957X_BKEN 0x02
40#define PCA957X_PUPD 0x03
41#define PCA957X_CFG 0x04
42#define PCA957X_OUT 0x05
43#define PCA957X_MSK 0x06
44#define PCA957X_INTS 0x07
45
46#define PCAL953X_OUT_STRENGTH 0x20
47#define PCAL953X_IN_LATCH 0x22
48#define PCAL953X_PULL_EN 0x23
49#define PCAL953X_PULL_SEL 0x24
50#define PCAL953X_INT_MASK 0x25
51#define PCAL953X_INT_STAT 0x26
52#define PCAL953X_OUT_CONF 0x27
53
54#define PCAL6524_INT_EDGE 0x28
55#define PCAL6524_INT_CLR 0x2a
56#define PCAL6524_IN_STATUS 0x2b
57#define PCAL6524_OUT_INDCONF 0x2c
58#define PCAL6524_DEBOUNCE 0x2d
59
60#define PCA_GPIO_MASK GENMASK(7, 0)
61
62#define PCAL_GPIO_MASK GENMASK(4, 0)
63#define PCAL_PINCTRL_MASK GENMASK(6, 5)
64
65#define PCA_INT BIT(8)
66#define PCA_PCAL BIT(9)
67#define PCA_LATCH_INT (PCA_PCAL | PCA_INT)
68#define PCA953X_TYPE BIT(12)
69#define PCA957X_TYPE BIT(13)
70#define PCAL653X_TYPE BIT(14)
71#define PCA_TYPE_MASK GENMASK(15, 12)
72
73#define PCA_CHIP_TYPE(x) ((x) & PCA_TYPE_MASK)
74
75static const struct i2c_device_id pca953x_id[] = {
76 { "pca6408", 8 | PCA953X_TYPE | PCA_INT, },
77 { "pca6416", 16 | PCA953X_TYPE | PCA_INT, },
78 { "pca9505", 40 | PCA953X_TYPE | PCA_INT, },
79 { "pca9506", 40 | PCA953X_TYPE | PCA_INT, },
80 { "pca9534", 8 | PCA953X_TYPE | PCA_INT, },
81 { "pca9535", 16 | PCA953X_TYPE | PCA_INT, },
82 { "pca9536", 4 | PCA953X_TYPE, },
83 { "pca9537", 4 | PCA953X_TYPE | PCA_INT, },
84 { "pca9538", 8 | PCA953X_TYPE | PCA_INT, },
85 { "pca9539", 16 | PCA953X_TYPE | PCA_INT, },
86 { "pca9554", 8 | PCA953X_TYPE | PCA_INT, },
87 { "pca9555", 16 | PCA953X_TYPE | PCA_INT, },
88 { "pca9556", 8 | PCA953X_TYPE, },
89 { "pca9557", 8 | PCA953X_TYPE, },
90 { "pca9574", 8 | PCA957X_TYPE | PCA_INT, },
91 { "pca9575", 16 | PCA957X_TYPE | PCA_INT, },
92 { "pca9698", 40 | PCA953X_TYPE, },
93
94 { "pcal6408", 8 | PCA953X_TYPE | PCA_LATCH_INT, },
95 { "pcal6416", 16 | PCA953X_TYPE | PCA_LATCH_INT, },
96 { "pcal6524", 24 | PCA953X_TYPE | PCA_LATCH_INT, },
97 { "pcal6534", 34 | PCAL653X_TYPE | PCA_LATCH_INT, },
98 { "pcal9535", 16 | PCA953X_TYPE | PCA_LATCH_INT, },
99 { "pcal9554b", 8 | PCA953X_TYPE | PCA_LATCH_INT, },
100 { "pcal9555a", 16 | PCA953X_TYPE | PCA_LATCH_INT, },
101
102 { "max7310", 8 | PCA953X_TYPE, },
103 { "max7312", 16 | PCA953X_TYPE | PCA_INT, },
104 { "max7313", 16 | PCA953X_TYPE | PCA_INT, },
105 { "max7315", 8 | PCA953X_TYPE | PCA_INT, },
106 { "max7318", 16 | PCA953X_TYPE | PCA_INT, },
107 { "pca6107", 8 | PCA953X_TYPE | PCA_INT, },
108 { "tca6408", 8 | PCA953X_TYPE | PCA_INT, },
109 { "tca6416", 16 | PCA953X_TYPE | PCA_INT, },
110 { "tca6424", 24 | PCA953X_TYPE | PCA_INT, },
111 { "tca9539", 16 | PCA953X_TYPE | PCA_INT, },
112 { "tca9554", 8 | PCA953X_TYPE | PCA_INT, },
113 { "xra1202", 8 | PCA953X_TYPE },
114 { }
115};
116MODULE_DEVICE_TABLE(i2c, pca953x_id);
117
118#ifdef CONFIG_GPIO_PCA953X_IRQ
119
120#include <linux/dmi.h>
121
122static const struct acpi_gpio_params pca953x_irq_gpios = { 0, 0, true };
123
124static const struct acpi_gpio_mapping pca953x_acpi_irq_gpios[] = {
125 { "irq-gpios", &pca953x_irq_gpios, 1, ACPI_GPIO_QUIRK_ABSOLUTE_NUMBER },
126 { }
127};
128
129static int pca953x_acpi_get_irq(struct device *dev)
130{
131 int ret;
132
133 ret = devm_acpi_dev_add_driver_gpios(dev, pca953x_acpi_irq_gpios);
134 if (ret)
135 dev_warn(dev, "can't add GPIO ACPI mapping\n");
136
137 ret = acpi_dev_gpio_irq_get_by(ACPI_COMPANION(dev), "irq-gpios", 0);
138 if (ret < 0)
139 return ret;
140
141 dev_info(dev, "ACPI interrupt quirk (IRQ %d)\n", ret);
142 return ret;
143}
144
145static const struct dmi_system_id pca953x_dmi_acpi_irq_info[] = {
146 {
147 /*
148 * On Intel Galileo Gen 2 board the IRQ pin of one of
149 * the I²C GPIO expanders, which has GpioInt() resource,
150 * is provided as an absolute number instead of being
151 * relative. Since first controller (gpio-sch.c) and
152 * second (gpio-dwapb.c) are at the fixed bases, we may
153 * safely refer to the number in the global space to get
154 * an IRQ out of it.
155 */
156 .matches = {
157 DMI_EXACT_MATCH(DMI_BOARD_NAME, "GalileoGen2"),
158 },
159 },
160 {}
161};
162#endif
163
164static const struct acpi_device_id pca953x_acpi_ids[] = {
165 { "INT3491", 16 | PCA953X_TYPE | PCA_LATCH_INT, },
166 { }
167};
168MODULE_DEVICE_TABLE(acpi, pca953x_acpi_ids);
169
170#define MAX_BANK 5
171#define BANK_SZ 8
172#define MAX_LINE (MAX_BANK * BANK_SZ)
173
174#define NBANK(chip) DIV_ROUND_UP(chip->gpio_chip.ngpio, BANK_SZ)
175
176struct pca953x_reg_config {
177 int direction;
178 int output;
179 int input;
180 int invert;
181};
182
183static const struct pca953x_reg_config pca953x_regs = {
184 .direction = PCA953X_DIRECTION,
185 .output = PCA953X_OUTPUT,
186 .input = PCA953X_INPUT,
187 .invert = PCA953X_INVERT,
188};
189
190static const struct pca953x_reg_config pca957x_regs = {
191 .direction = PCA957X_CFG,
192 .output = PCA957X_OUT,
193 .input = PCA957X_IN,
194 .invert = PCA957X_INVRT,
195};
196
197struct pca953x_chip {
198 unsigned gpio_start;
199 struct mutex i2c_lock;
200 struct regmap *regmap;
201
202#ifdef CONFIG_GPIO_PCA953X_IRQ
203 struct mutex irq_lock;
204 DECLARE_BITMAP(irq_mask, MAX_LINE);
205 DECLARE_BITMAP(irq_stat, MAX_LINE);
206 DECLARE_BITMAP(irq_trig_raise, MAX_LINE);
207 DECLARE_BITMAP(irq_trig_fall, MAX_LINE);
208#endif
209 atomic_t wakeup_path;
210
211 struct i2c_client *client;
212 struct gpio_chip gpio_chip;
213 const char *const *names;
214 unsigned long driver_data;
215 struct regulator *regulator;
216
217 const struct pca953x_reg_config *regs;
218
219 u8 (*recalc_addr)(struct pca953x_chip *chip, int reg, int off);
220 bool (*check_reg)(struct pca953x_chip *chip, unsigned int reg,
221 u32 checkbank);
222};
223
224static int pca953x_bank_shift(struct pca953x_chip *chip)
225{
226 return fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
227}
228
229#define PCA953x_BANK_INPUT BIT(0)
230#define PCA953x_BANK_OUTPUT BIT(1)
231#define PCA953x_BANK_POLARITY BIT(2)
232#define PCA953x_BANK_CONFIG BIT(3)
233
234#define PCA957x_BANK_INPUT BIT(0)
235#define PCA957x_BANK_POLARITY BIT(1)
236#define PCA957x_BANK_BUSHOLD BIT(2)
237#define PCA957x_BANK_CONFIG BIT(4)
238#define PCA957x_BANK_OUTPUT BIT(5)
239
240#define PCAL9xxx_BANK_IN_LATCH BIT(8 + 2)
241#define PCAL9xxx_BANK_PULL_EN BIT(8 + 3)
242#define PCAL9xxx_BANK_PULL_SEL BIT(8 + 4)
243#define PCAL9xxx_BANK_IRQ_MASK BIT(8 + 5)
244#define PCAL9xxx_BANK_IRQ_STAT BIT(8 + 6)
245
246/*
247 * We care about the following registers:
248 * - Standard set, below 0x40, each port can be replicated up to 8 times
249 * - PCA953x standard
250 * Input port 0x00 + 0 * bank_size R
251 * Output port 0x00 + 1 * bank_size RW
252 * Polarity Inversion port 0x00 + 2 * bank_size RW
253 * Configuration port 0x00 + 3 * bank_size RW
254 * - PCA957x with mixed up registers
255 * Input port 0x00 + 0 * bank_size R
256 * Polarity Inversion port 0x00 + 1 * bank_size RW
257 * Bus hold port 0x00 + 2 * bank_size RW
258 * Configuration port 0x00 + 4 * bank_size RW
259 * Output port 0x00 + 5 * bank_size RW
260 *
261 * - Extended set, above 0x40, often chip specific.
262 * - PCAL6524/PCAL9555A with custom PCAL IRQ handling:
263 * Input latch register 0x40 + 2 * bank_size RW
264 * Pull-up/pull-down enable reg 0x40 + 3 * bank_size RW
265 * Pull-up/pull-down select reg 0x40 + 4 * bank_size RW
266 * Interrupt mask register 0x40 + 5 * bank_size RW
267 * Interrupt status register 0x40 + 6 * bank_size R
268 *
269 * - Registers with bit 0x80 set, the AI bit
270 * The bit is cleared and the registers fall into one of the
271 * categories above.
272 */
273
274static bool pca953x_check_register(struct pca953x_chip *chip, unsigned int reg,
275 u32 checkbank)
276{
277 int bank_shift = pca953x_bank_shift(chip);
278 int bank = (reg & REG_ADDR_MASK) >> bank_shift;
279 int offset = reg & (BIT(bank_shift) - 1);
280
281 /* Special PCAL extended register check. */
282 if (reg & REG_ADDR_EXT) {
283 if (!(chip->driver_data & PCA_PCAL))
284 return false;
285 bank += 8;
286 }
287
288 /* Register is not in the matching bank. */
289 if (!(BIT(bank) & checkbank))
290 return false;
291
292 /* Register is not within allowed range of bank. */
293 if (offset >= NBANK(chip))
294 return false;
295
296 return true;
297}
298
299/*
300 * Unfortunately, whilst the PCAL6534 chip (and compatibles) broadly follow the
301 * same register layout as the PCAL6524, the spacing of the registers has been
302 * fundamentally altered by compacting them and thus does not obey the same
303 * rules, including being able to use bit shifting to determine bank. These
304 * chips hence need special handling here.
305 */
306static bool pcal6534_check_register(struct pca953x_chip *chip, unsigned int reg,
307 u32 checkbank)
308{
309 int bank;
310 int offset;
311
312 if (reg >= 0x30) {
313 /*
314 * Reserved block between 14h and 2Fh does not align on
315 * expected bank boundaries like other devices.
316 */
317 int temp = reg - 0x30;
318
319 bank = temp / NBANK(chip);
320 offset = temp - (bank * NBANK(chip));
321 bank += 8;
322 } else if (reg >= 0x54) {
323 /*
324 * Handle lack of reserved registers after output port
325 * configuration register to form a bank.
326 */
327 int temp = reg - 0x54;
328
329 bank = temp / NBANK(chip);
330 offset = temp - (bank * NBANK(chip));
331 bank += 16;
332 } else {
333 bank = reg / NBANK(chip);
334 offset = reg - (bank * NBANK(chip));
335 }
336
337 /* Register is not in the matching bank. */
338 if (!(BIT(bank) & checkbank))
339 return false;
340
341 /* Register is not within allowed range of bank. */
342 if (offset >= NBANK(chip))
343 return false;
344
345 return true;
346}
347
348static bool pca953x_readable_register(struct device *dev, unsigned int reg)
349{
350 struct pca953x_chip *chip = dev_get_drvdata(dev);
351 u32 bank;
352
353 if (PCA_CHIP_TYPE(chip->driver_data) == PCA957X_TYPE) {
354 bank = PCA957x_BANK_INPUT | PCA957x_BANK_OUTPUT |
355 PCA957x_BANK_POLARITY | PCA957x_BANK_CONFIG |
356 PCA957x_BANK_BUSHOLD;
357 } else {
358 bank = PCA953x_BANK_INPUT | PCA953x_BANK_OUTPUT |
359 PCA953x_BANK_POLARITY | PCA953x_BANK_CONFIG;
360 }
361
362 if (chip->driver_data & PCA_PCAL) {
363 bank |= PCAL9xxx_BANK_IN_LATCH | PCAL9xxx_BANK_PULL_EN |
364 PCAL9xxx_BANK_PULL_SEL | PCAL9xxx_BANK_IRQ_MASK |
365 PCAL9xxx_BANK_IRQ_STAT;
366 }
367
368 return chip->check_reg(chip, reg, bank);
369}
370
371static bool pca953x_writeable_register(struct device *dev, unsigned int reg)
372{
373 struct pca953x_chip *chip = dev_get_drvdata(dev);
374 u32 bank;
375
376 if (PCA_CHIP_TYPE(chip->driver_data) == PCA957X_TYPE) {
377 bank = PCA957x_BANK_OUTPUT | PCA957x_BANK_POLARITY |
378 PCA957x_BANK_CONFIG | PCA957x_BANK_BUSHOLD;
379 } else {
380 bank = PCA953x_BANK_OUTPUT | PCA953x_BANK_POLARITY |
381 PCA953x_BANK_CONFIG;
382 }
383
384 if (chip->driver_data & PCA_PCAL)
385 bank |= PCAL9xxx_BANK_IN_LATCH | PCAL9xxx_BANK_PULL_EN |
386 PCAL9xxx_BANK_PULL_SEL | PCAL9xxx_BANK_IRQ_MASK;
387
388 return chip->check_reg(chip, reg, bank);
389}
390
391static bool pca953x_volatile_register(struct device *dev, unsigned int reg)
392{
393 struct pca953x_chip *chip = dev_get_drvdata(dev);
394 u32 bank;
395
396 if (PCA_CHIP_TYPE(chip->driver_data) == PCA957X_TYPE)
397 bank = PCA957x_BANK_INPUT;
398 else
399 bank = PCA953x_BANK_INPUT;
400
401 if (chip->driver_data & PCA_PCAL)
402 bank |= PCAL9xxx_BANK_IRQ_STAT;
403
404 return chip->check_reg(chip, reg, bank);
405}
406
407static const struct regmap_config pca953x_i2c_regmap = {
408 .reg_bits = 8,
409 .val_bits = 8,
410
411 .use_single_read = true,
412 .use_single_write = true,
413
414 .readable_reg = pca953x_readable_register,
415 .writeable_reg = pca953x_writeable_register,
416 .volatile_reg = pca953x_volatile_register,
417
418 .disable_locking = true,
419 .cache_type = REGCACHE_RBTREE,
420 .max_register = 0x7f,
421};
422
423static const struct regmap_config pca953x_ai_i2c_regmap = {
424 .reg_bits = 8,
425 .val_bits = 8,
426
427 .read_flag_mask = REG_ADDR_AI,
428 .write_flag_mask = REG_ADDR_AI,
429
430 .readable_reg = pca953x_readable_register,
431 .writeable_reg = pca953x_writeable_register,
432 .volatile_reg = pca953x_volatile_register,
433
434 .disable_locking = true,
435 .cache_type = REGCACHE_RBTREE,
436 .max_register = 0x7f,
437};
438
439static u8 pca953x_recalc_addr(struct pca953x_chip *chip, int reg, int off)
440{
441 int bank_shift = pca953x_bank_shift(chip);
442 int addr = (reg & PCAL_GPIO_MASK) << bank_shift;
443 int pinctrl = (reg & PCAL_PINCTRL_MASK) << 1;
444 u8 regaddr = pinctrl | addr | (off / BANK_SZ);
445
446 return regaddr;
447}
448
449/*
450 * The PCAL6534 and compatible chips have altered bank alignment that doesn't
451 * fit within the bit shifting scheme used for other devices.
452 */
453static u8 pcal6534_recalc_addr(struct pca953x_chip *chip, int reg, int off)
454{
455 int addr;
456 int pinctrl;
457
458 addr = (reg & PCAL_GPIO_MASK) * NBANK(chip);
459
460 switch (reg) {
461 case PCAL953X_OUT_STRENGTH:
462 case PCAL953X_IN_LATCH:
463 case PCAL953X_PULL_EN:
464 case PCAL953X_PULL_SEL:
465 case PCAL953X_INT_MASK:
466 case PCAL953X_INT_STAT:
467 case PCAL953X_OUT_CONF:
468 pinctrl = ((reg & PCAL_PINCTRL_MASK) >> 1) + 0x20;
469 break;
470 case PCAL6524_INT_EDGE:
471 case PCAL6524_INT_CLR:
472 case PCAL6524_IN_STATUS:
473 case PCAL6524_OUT_INDCONF:
474 case PCAL6524_DEBOUNCE:
475 pinctrl = ((reg & PCAL_PINCTRL_MASK) >> 1) + 0x1c;
476 break;
477 default:
478 pinctrl = 0;
479 break;
480 }
481
482 return pinctrl + addr + (off / BANK_SZ);
483}
484
485static int pca953x_write_regs(struct pca953x_chip *chip, int reg, unsigned long *val)
486{
487 u8 regaddr = chip->recalc_addr(chip, reg, 0);
488 u8 value[MAX_BANK];
489 int i, ret;
490
491 for (i = 0; i < NBANK(chip); i++)
492 value[i] = bitmap_get_value8(val, i * BANK_SZ);
493
494 ret = regmap_bulk_write(chip->regmap, regaddr, value, NBANK(chip));
495 if (ret < 0) {
496 dev_err(&chip->client->dev, "failed writing register\n");
497 return ret;
498 }
499
500 return 0;
501}
502
503static int pca953x_read_regs(struct pca953x_chip *chip, int reg, unsigned long *val)
504{
505 u8 regaddr = chip->recalc_addr(chip, reg, 0);
506 u8 value[MAX_BANK];
507 int i, ret;
508
509 ret = regmap_bulk_read(chip->regmap, regaddr, value, NBANK(chip));
510 if (ret < 0) {
511 dev_err(&chip->client->dev, "failed reading register\n");
512 return ret;
513 }
514
515 for (i = 0; i < NBANK(chip); i++)
516 bitmap_set_value8(val, value[i], i * BANK_SZ);
517
518 return 0;
519}
520
521static int pca953x_gpio_direction_input(struct gpio_chip *gc, unsigned off)
522{
523 struct pca953x_chip *chip = gpiochip_get_data(gc);
524 u8 dirreg = chip->recalc_addr(chip, chip->regs->direction, off);
525 u8 bit = BIT(off % BANK_SZ);
526 int ret;
527
528 mutex_lock(&chip->i2c_lock);
529 ret = regmap_write_bits(chip->regmap, dirreg, bit, bit);
530 mutex_unlock(&chip->i2c_lock);
531 return ret;
532}
533
534static int pca953x_gpio_direction_output(struct gpio_chip *gc,
535 unsigned off, int val)
536{
537 struct pca953x_chip *chip = gpiochip_get_data(gc);
538 u8 dirreg = chip->recalc_addr(chip, chip->regs->direction, off);
539 u8 outreg = chip->recalc_addr(chip, chip->regs->output, off);
540 u8 bit = BIT(off % BANK_SZ);
541 int ret;
542
543 mutex_lock(&chip->i2c_lock);
544 /* set output level */
545 ret = regmap_write_bits(chip->regmap, outreg, bit, val ? bit : 0);
546 if (ret)
547 goto exit;
548
549 /* then direction */
550 ret = regmap_write_bits(chip->regmap, dirreg, bit, 0);
551exit:
552 mutex_unlock(&chip->i2c_lock);
553 return ret;
554}
555
556static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off)
557{
558 struct pca953x_chip *chip = gpiochip_get_data(gc);
559 u8 inreg = chip->recalc_addr(chip, chip->regs->input, off);
560 u8 bit = BIT(off % BANK_SZ);
561 u32 reg_val;
562 int ret;
563
564 mutex_lock(&chip->i2c_lock);
565 ret = regmap_read(chip->regmap, inreg, ®_val);
566 mutex_unlock(&chip->i2c_lock);
567 if (ret < 0)
568 return ret;
569
570 return !!(reg_val & bit);
571}
572
573static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val)
574{
575 struct pca953x_chip *chip = gpiochip_get_data(gc);
576 u8 outreg = chip->recalc_addr(chip, chip->regs->output, off);
577 u8 bit = BIT(off % BANK_SZ);
578
579 mutex_lock(&chip->i2c_lock);
580 regmap_write_bits(chip->regmap, outreg, bit, val ? bit : 0);
581 mutex_unlock(&chip->i2c_lock);
582}
583
584static int pca953x_gpio_get_direction(struct gpio_chip *gc, unsigned off)
585{
586 struct pca953x_chip *chip = gpiochip_get_data(gc);
587 u8 dirreg = chip->recalc_addr(chip, chip->regs->direction, off);
588 u8 bit = BIT(off % BANK_SZ);
589 u32 reg_val;
590 int ret;
591
592 mutex_lock(&chip->i2c_lock);
593 ret = regmap_read(chip->regmap, dirreg, ®_val);
594 mutex_unlock(&chip->i2c_lock);
595 if (ret < 0)
596 return ret;
597
598 if (reg_val & bit)
599 return GPIO_LINE_DIRECTION_IN;
600
601 return GPIO_LINE_DIRECTION_OUT;
602}
603
604static int pca953x_gpio_get_multiple(struct gpio_chip *gc,
605 unsigned long *mask, unsigned long *bits)
606{
607 struct pca953x_chip *chip = gpiochip_get_data(gc);
608 DECLARE_BITMAP(reg_val, MAX_LINE);
609 int ret;
610
611 mutex_lock(&chip->i2c_lock);
612 ret = pca953x_read_regs(chip, chip->regs->input, reg_val);
613 mutex_unlock(&chip->i2c_lock);
614 if (ret)
615 return ret;
616
617 bitmap_replace(bits, bits, reg_val, mask, gc->ngpio);
618 return 0;
619}
620
621static void pca953x_gpio_set_multiple(struct gpio_chip *gc,
622 unsigned long *mask, unsigned long *bits)
623{
624 struct pca953x_chip *chip = gpiochip_get_data(gc);
625 DECLARE_BITMAP(reg_val, MAX_LINE);
626 int ret;
627
628 mutex_lock(&chip->i2c_lock);
629 ret = pca953x_read_regs(chip, chip->regs->output, reg_val);
630 if (ret)
631 goto exit;
632
633 bitmap_replace(reg_val, reg_val, bits, mask, gc->ngpio);
634
635 pca953x_write_regs(chip, chip->regs->output, reg_val);
636exit:
637 mutex_unlock(&chip->i2c_lock);
638}
639
640static int pca953x_gpio_set_pull_up_down(struct pca953x_chip *chip,
641 unsigned int offset,
642 unsigned long config)
643{
644 enum pin_config_param param = pinconf_to_config_param(config);
645
646 u8 pull_en_reg = chip->recalc_addr(chip, PCAL953X_PULL_EN, offset);
647 u8 pull_sel_reg = chip->recalc_addr(chip, PCAL953X_PULL_SEL, offset);
648 u8 bit = BIT(offset % BANK_SZ);
649 int ret;
650
651 /*
652 * pull-up/pull-down configuration requires PCAL extended
653 * registers
654 */
655 if (!(chip->driver_data & PCA_PCAL))
656 return -ENOTSUPP;
657
658 mutex_lock(&chip->i2c_lock);
659
660 /* Configure pull-up/pull-down */
661 if (param == PIN_CONFIG_BIAS_PULL_UP)
662 ret = regmap_write_bits(chip->regmap, pull_sel_reg, bit, bit);
663 else if (param == PIN_CONFIG_BIAS_PULL_DOWN)
664 ret = regmap_write_bits(chip->regmap, pull_sel_reg, bit, 0);
665 else
666 ret = 0;
667 if (ret)
668 goto exit;
669
670 /* Disable/Enable pull-up/pull-down */
671 if (param == PIN_CONFIG_BIAS_DISABLE)
672 ret = regmap_write_bits(chip->regmap, pull_en_reg, bit, 0);
673 else
674 ret = regmap_write_bits(chip->regmap, pull_en_reg, bit, bit);
675
676exit:
677 mutex_unlock(&chip->i2c_lock);
678 return ret;
679}
680
681static int pca953x_gpio_set_config(struct gpio_chip *gc, unsigned int offset,
682 unsigned long config)
683{
684 struct pca953x_chip *chip = gpiochip_get_data(gc);
685
686 switch (pinconf_to_config_param(config)) {
687 case PIN_CONFIG_BIAS_PULL_UP:
688 case PIN_CONFIG_BIAS_PULL_PIN_DEFAULT:
689 case PIN_CONFIG_BIAS_PULL_DOWN:
690 case PIN_CONFIG_BIAS_DISABLE:
691 return pca953x_gpio_set_pull_up_down(chip, offset, config);
692 default:
693 return -ENOTSUPP;
694 }
695}
696
697static void pca953x_setup_gpio(struct pca953x_chip *chip, int gpios)
698{
699 struct gpio_chip *gc;
700
701 gc = &chip->gpio_chip;
702
703 gc->direction_input = pca953x_gpio_direction_input;
704 gc->direction_output = pca953x_gpio_direction_output;
705 gc->get = pca953x_gpio_get_value;
706 gc->set = pca953x_gpio_set_value;
707 gc->get_direction = pca953x_gpio_get_direction;
708 gc->get_multiple = pca953x_gpio_get_multiple;
709 gc->set_multiple = pca953x_gpio_set_multiple;
710 gc->set_config = pca953x_gpio_set_config;
711 gc->can_sleep = true;
712
713 gc->base = chip->gpio_start;
714 gc->ngpio = gpios;
715 gc->label = dev_name(&chip->client->dev);
716 gc->parent = &chip->client->dev;
717 gc->owner = THIS_MODULE;
718 gc->names = chip->names;
719}
720
721#ifdef CONFIG_GPIO_PCA953X_IRQ
722static void pca953x_irq_mask(struct irq_data *d)
723{
724 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
725 struct pca953x_chip *chip = gpiochip_get_data(gc);
726 irq_hw_number_t hwirq = irqd_to_hwirq(d);
727
728 clear_bit(hwirq, chip->irq_mask);
729 gpiochip_disable_irq(gc, hwirq);
730}
731
732static void pca953x_irq_unmask(struct irq_data *d)
733{
734 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
735 struct pca953x_chip *chip = gpiochip_get_data(gc);
736 irq_hw_number_t hwirq = irqd_to_hwirq(d);
737
738 gpiochip_enable_irq(gc, hwirq);
739 set_bit(hwirq, chip->irq_mask);
740}
741
742static int pca953x_irq_set_wake(struct irq_data *d, unsigned int on)
743{
744 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
745 struct pca953x_chip *chip = gpiochip_get_data(gc);
746
747 if (on)
748 atomic_inc(&chip->wakeup_path);
749 else
750 atomic_dec(&chip->wakeup_path);
751
752 return irq_set_irq_wake(chip->client->irq, on);
753}
754
755static void pca953x_irq_bus_lock(struct irq_data *d)
756{
757 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
758 struct pca953x_chip *chip = gpiochip_get_data(gc);
759
760 mutex_lock(&chip->irq_lock);
761}
762
763static void pca953x_irq_bus_sync_unlock(struct irq_data *d)
764{
765 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
766 struct pca953x_chip *chip = gpiochip_get_data(gc);
767 DECLARE_BITMAP(irq_mask, MAX_LINE);
768 DECLARE_BITMAP(reg_direction, MAX_LINE);
769 int level;
770
771 if (chip->driver_data & PCA_PCAL) {
772 /* Enable latch on interrupt-enabled inputs */
773 pca953x_write_regs(chip, PCAL953X_IN_LATCH, chip->irq_mask);
774
775 bitmap_complement(irq_mask, chip->irq_mask, gc->ngpio);
776
777 /* Unmask enabled interrupts */
778 pca953x_write_regs(chip, PCAL953X_INT_MASK, irq_mask);
779 }
780
781 /* Switch direction to input if needed */
782 pca953x_read_regs(chip, chip->regs->direction, reg_direction);
783
784 bitmap_or(irq_mask, chip->irq_trig_fall, chip->irq_trig_raise, gc->ngpio);
785 bitmap_complement(reg_direction, reg_direction, gc->ngpio);
786 bitmap_and(irq_mask, irq_mask, reg_direction, gc->ngpio);
787
788 /* Look for any newly setup interrupt */
789 for_each_set_bit(level, irq_mask, gc->ngpio)
790 pca953x_gpio_direction_input(&chip->gpio_chip, level);
791
792 mutex_unlock(&chip->irq_lock);
793}
794
795static int pca953x_irq_set_type(struct irq_data *d, unsigned int type)
796{
797 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
798 struct pca953x_chip *chip = gpiochip_get_data(gc);
799 irq_hw_number_t hwirq = irqd_to_hwirq(d);
800
801 if (!(type & IRQ_TYPE_EDGE_BOTH)) {
802 dev_err(&chip->client->dev, "irq %d: unsupported type %d\n",
803 d->irq, type);
804 return -EINVAL;
805 }
806
807 assign_bit(hwirq, chip->irq_trig_fall, type & IRQ_TYPE_EDGE_FALLING);
808 assign_bit(hwirq, chip->irq_trig_raise, type & IRQ_TYPE_EDGE_RISING);
809
810 return 0;
811}
812
813static void pca953x_irq_shutdown(struct irq_data *d)
814{
815 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
816 struct pca953x_chip *chip = gpiochip_get_data(gc);
817 irq_hw_number_t hwirq = irqd_to_hwirq(d);
818
819 clear_bit(hwirq, chip->irq_trig_raise);
820 clear_bit(hwirq, chip->irq_trig_fall);
821}
822
823static void pca953x_irq_print_chip(struct irq_data *data, struct seq_file *p)
824{
825 struct gpio_chip *gc = irq_data_get_irq_chip_data(data);
826
827 seq_printf(p, dev_name(gc->parent));
828}
829
830static const struct irq_chip pca953x_irq_chip = {
831 .irq_mask = pca953x_irq_mask,
832 .irq_unmask = pca953x_irq_unmask,
833 .irq_set_wake = pca953x_irq_set_wake,
834 .irq_bus_lock = pca953x_irq_bus_lock,
835 .irq_bus_sync_unlock = pca953x_irq_bus_sync_unlock,
836 .irq_set_type = pca953x_irq_set_type,
837 .irq_shutdown = pca953x_irq_shutdown,
838 .irq_print_chip = pca953x_irq_print_chip,
839 .flags = IRQCHIP_IMMUTABLE,
840 GPIOCHIP_IRQ_RESOURCE_HELPERS,
841};
842
843static bool pca953x_irq_pending(struct pca953x_chip *chip, unsigned long *pending)
844{
845 struct gpio_chip *gc = &chip->gpio_chip;
846 DECLARE_BITMAP(reg_direction, MAX_LINE);
847 DECLARE_BITMAP(old_stat, MAX_LINE);
848 DECLARE_BITMAP(cur_stat, MAX_LINE);
849 DECLARE_BITMAP(new_stat, MAX_LINE);
850 DECLARE_BITMAP(trigger, MAX_LINE);
851 int ret;
852
853 if (chip->driver_data & PCA_PCAL) {
854 /* Read the current interrupt status from the device */
855 ret = pca953x_read_regs(chip, PCAL953X_INT_STAT, trigger);
856 if (ret)
857 return false;
858
859 /* Check latched inputs and clear interrupt status */
860 ret = pca953x_read_regs(chip, chip->regs->input, cur_stat);
861 if (ret)
862 return false;
863
864 /* Apply filter for rising/falling edge selection */
865 bitmap_replace(new_stat, chip->irq_trig_fall, chip->irq_trig_raise, cur_stat, gc->ngpio);
866
867 bitmap_and(pending, new_stat, trigger, gc->ngpio);
868
869 return !bitmap_empty(pending, gc->ngpio);
870 }
871
872 ret = pca953x_read_regs(chip, chip->regs->input, cur_stat);
873 if (ret)
874 return false;
875
876 /* Remove output pins from the equation */
877 pca953x_read_regs(chip, chip->regs->direction, reg_direction);
878
879 bitmap_copy(old_stat, chip->irq_stat, gc->ngpio);
880
881 bitmap_and(new_stat, cur_stat, reg_direction, gc->ngpio);
882 bitmap_xor(cur_stat, new_stat, old_stat, gc->ngpio);
883 bitmap_and(trigger, cur_stat, chip->irq_mask, gc->ngpio);
884
885 bitmap_copy(chip->irq_stat, new_stat, gc->ngpio);
886
887 if (bitmap_empty(trigger, gc->ngpio))
888 return false;
889
890 bitmap_and(cur_stat, chip->irq_trig_fall, old_stat, gc->ngpio);
891 bitmap_and(old_stat, chip->irq_trig_raise, new_stat, gc->ngpio);
892 bitmap_or(new_stat, old_stat, cur_stat, gc->ngpio);
893 bitmap_and(pending, new_stat, trigger, gc->ngpio);
894
895 return !bitmap_empty(pending, gc->ngpio);
896}
897
898static irqreturn_t pca953x_irq_handler(int irq, void *devid)
899{
900 struct pca953x_chip *chip = devid;
901 struct gpio_chip *gc = &chip->gpio_chip;
902 DECLARE_BITMAP(pending, MAX_LINE);
903 int level;
904 bool ret;
905
906 bitmap_zero(pending, MAX_LINE);
907
908 mutex_lock(&chip->i2c_lock);
909 ret = pca953x_irq_pending(chip, pending);
910 mutex_unlock(&chip->i2c_lock);
911
912 if (ret) {
913 ret = 0;
914
915 for_each_set_bit(level, pending, gc->ngpio) {
916 int nested_irq = irq_find_mapping(gc->irq.domain, level);
917
918 if (unlikely(nested_irq <= 0)) {
919 dev_warn_ratelimited(gc->parent, "unmapped interrupt %d\n", level);
920 continue;
921 }
922
923 handle_nested_irq(nested_irq);
924 ret = 1;
925 }
926 }
927
928 return IRQ_RETVAL(ret);
929}
930
931static int pca953x_irq_setup(struct pca953x_chip *chip, int irq_base)
932{
933 struct i2c_client *client = chip->client;
934 DECLARE_BITMAP(reg_direction, MAX_LINE);
935 DECLARE_BITMAP(irq_stat, MAX_LINE);
936 struct gpio_irq_chip *girq;
937 int ret;
938
939 if (dmi_first_match(pca953x_dmi_acpi_irq_info)) {
940 ret = pca953x_acpi_get_irq(&client->dev);
941 if (ret > 0)
942 client->irq = ret;
943 }
944
945 if (!client->irq)
946 return 0;
947
948 if (irq_base == -1)
949 return 0;
950
951 if (!(chip->driver_data & PCA_INT))
952 return 0;
953
954 ret = pca953x_read_regs(chip, chip->regs->input, irq_stat);
955 if (ret)
956 return ret;
957
958 /*
959 * There is no way to know which GPIO line generated the
960 * interrupt. We have to rely on the previous read for
961 * this purpose.
962 */
963 pca953x_read_regs(chip, chip->regs->direction, reg_direction);
964 bitmap_and(chip->irq_stat, irq_stat, reg_direction, chip->gpio_chip.ngpio);
965 mutex_init(&chip->irq_lock);
966
967 girq = &chip->gpio_chip.irq;
968 gpio_irq_chip_set_chip(girq, &pca953x_irq_chip);
969 /* This will let us handle the parent IRQ in the driver */
970 girq->parent_handler = NULL;
971 girq->num_parents = 0;
972 girq->parents = NULL;
973 girq->default_type = IRQ_TYPE_NONE;
974 girq->handler = handle_simple_irq;
975 girq->threaded = true;
976 girq->first = irq_base; /* FIXME: get rid of this */
977
978 ret = devm_request_threaded_irq(&client->dev, client->irq,
979 NULL, pca953x_irq_handler,
980 IRQF_ONESHOT | IRQF_SHARED,
981 dev_name(&client->dev), chip);
982 if (ret) {
983 dev_err(&client->dev, "failed to request irq %d\n",
984 client->irq);
985 return ret;
986 }
987
988 return 0;
989}
990
991#else /* CONFIG_GPIO_PCA953X_IRQ */
992static int pca953x_irq_setup(struct pca953x_chip *chip,
993 int irq_base)
994{
995 struct i2c_client *client = chip->client;
996
997 if (client->irq && irq_base != -1 && (chip->driver_data & PCA_INT))
998 dev_warn(&client->dev, "interrupt support not compiled in\n");
999
1000 return 0;
1001}
1002#endif
1003
1004static int device_pca95xx_init(struct pca953x_chip *chip, u32 invert)
1005{
1006 DECLARE_BITMAP(val, MAX_LINE);
1007 u8 regaddr;
1008 int ret;
1009
1010 regaddr = chip->recalc_addr(chip, chip->regs->output, 0);
1011 ret = regcache_sync_region(chip->regmap, regaddr,
1012 regaddr + NBANK(chip) - 1);
1013 if (ret)
1014 goto out;
1015
1016 regaddr = chip->recalc_addr(chip, chip->regs->direction, 0);
1017 ret = regcache_sync_region(chip->regmap, regaddr,
1018 regaddr + NBANK(chip) - 1);
1019 if (ret)
1020 goto out;
1021
1022 /* set platform specific polarity inversion */
1023 if (invert)
1024 bitmap_fill(val, MAX_LINE);
1025 else
1026 bitmap_zero(val, MAX_LINE);
1027
1028 ret = pca953x_write_regs(chip, chip->regs->invert, val);
1029out:
1030 return ret;
1031}
1032
1033static int device_pca957x_init(struct pca953x_chip *chip, u32 invert)
1034{
1035 DECLARE_BITMAP(val, MAX_LINE);
1036 unsigned int i;
1037 int ret;
1038
1039 ret = device_pca95xx_init(chip, invert);
1040 if (ret)
1041 goto out;
1042
1043 /* To enable register 6, 7 to control pull up and pull down */
1044 for (i = 0; i < NBANK(chip); i++)
1045 bitmap_set_value8(val, 0x02, i * BANK_SZ);
1046
1047 ret = pca953x_write_regs(chip, PCA957X_BKEN, val);
1048 if (ret)
1049 goto out;
1050
1051 return 0;
1052out:
1053 return ret;
1054}
1055
1056static int pca953x_probe(struct i2c_client *client)
1057{
1058 const struct i2c_device_id *i2c_id = i2c_client_get_device_id(client);
1059 struct pca953x_platform_data *pdata;
1060 struct pca953x_chip *chip;
1061 int irq_base = 0;
1062 int ret;
1063 u32 invert = 0;
1064 struct regulator *reg;
1065 const struct regmap_config *regmap_config;
1066
1067 chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
1068 if (chip == NULL)
1069 return -ENOMEM;
1070
1071 pdata = dev_get_platdata(&client->dev);
1072 if (pdata) {
1073 irq_base = pdata->irq_base;
1074 chip->gpio_start = pdata->gpio_base;
1075 invert = pdata->invert;
1076 chip->names = pdata->names;
1077 } else {
1078 struct gpio_desc *reset_gpio;
1079
1080 chip->gpio_start = -1;
1081 irq_base = 0;
1082
1083 /*
1084 * See if we need to de-assert a reset pin.
1085 *
1086 * There is no known ACPI-enabled platforms that are
1087 * using "reset" GPIO. Otherwise any of those platform
1088 * must use _DSD method with corresponding property.
1089 */
1090 reset_gpio = devm_gpiod_get_optional(&client->dev, "reset",
1091 GPIOD_OUT_LOW);
1092 if (IS_ERR(reset_gpio))
1093 return PTR_ERR(reset_gpio);
1094 }
1095
1096 chip->client = client;
1097
1098 reg = devm_regulator_get(&client->dev, "vcc");
1099 if (IS_ERR(reg))
1100 return dev_err_probe(&client->dev, PTR_ERR(reg), "reg get err\n");
1101
1102 ret = regulator_enable(reg);
1103 if (ret) {
1104 dev_err(&client->dev, "reg en err: %d\n", ret);
1105 return ret;
1106 }
1107 chip->regulator = reg;
1108
1109 if (i2c_id) {
1110 chip->driver_data = i2c_id->driver_data;
1111 } else {
1112 const void *match;
1113
1114 match = device_get_match_data(&client->dev);
1115 if (!match) {
1116 ret = -ENODEV;
1117 goto err_exit;
1118 }
1119
1120 chip->driver_data = (uintptr_t)match;
1121 }
1122
1123 i2c_set_clientdata(client, chip);
1124
1125 pca953x_setup_gpio(chip, chip->driver_data & PCA_GPIO_MASK);
1126
1127 if (NBANK(chip) > 2 || PCA_CHIP_TYPE(chip->driver_data) == PCA957X_TYPE) {
1128 dev_info(&client->dev, "using AI\n");
1129 regmap_config = &pca953x_ai_i2c_regmap;
1130 } else {
1131 dev_info(&client->dev, "using no AI\n");
1132 regmap_config = &pca953x_i2c_regmap;
1133 }
1134
1135 if (PCA_CHIP_TYPE(chip->driver_data) == PCAL653X_TYPE) {
1136 chip->recalc_addr = pcal6534_recalc_addr;
1137 chip->check_reg = pcal6534_check_register;
1138 } else {
1139 chip->recalc_addr = pca953x_recalc_addr;
1140 chip->check_reg = pca953x_check_register;
1141 }
1142
1143 chip->regmap = devm_regmap_init_i2c(client, regmap_config);
1144 if (IS_ERR(chip->regmap)) {
1145 ret = PTR_ERR(chip->regmap);
1146 goto err_exit;
1147 }
1148
1149 regcache_mark_dirty(chip->regmap);
1150
1151 mutex_init(&chip->i2c_lock);
1152 /*
1153 * In case we have an i2c-mux controlled by a GPIO provided by an
1154 * expander using the same driver higher on the device tree, read the
1155 * i2c adapter nesting depth and use the retrieved value as lockdep
1156 * subclass for chip->i2c_lock.
1157 *
1158 * REVISIT: This solution is not complete. It protects us from lockdep
1159 * false positives when the expander controlling the i2c-mux is on
1160 * a different level on the device tree, but not when it's on the same
1161 * level on a different branch (in which case the subclass number
1162 * would be the same).
1163 *
1164 * TODO: Once a correct solution is developed, a similar fix should be
1165 * applied to all other i2c-controlled GPIO expanders (and potentially
1166 * regmap-i2c).
1167 */
1168 lockdep_set_subclass(&chip->i2c_lock,
1169 i2c_adapter_depth(client->adapter));
1170
1171 /* initialize cached registers from their original values.
1172 * we can't share this chip with another i2c master.
1173 */
1174 if (PCA_CHIP_TYPE(chip->driver_data) == PCA957X_TYPE) {
1175 chip->regs = &pca957x_regs;
1176 ret = device_pca957x_init(chip, invert);
1177 } else {
1178 chip->regs = &pca953x_regs;
1179 ret = device_pca95xx_init(chip, invert);
1180 }
1181 if (ret)
1182 goto err_exit;
1183
1184 ret = pca953x_irq_setup(chip, irq_base);
1185 if (ret)
1186 goto err_exit;
1187
1188 ret = devm_gpiochip_add_data(&client->dev, &chip->gpio_chip, chip);
1189 if (ret)
1190 goto err_exit;
1191
1192 if (pdata && pdata->setup) {
1193 ret = pdata->setup(client, chip->gpio_chip.base,
1194 chip->gpio_chip.ngpio, pdata->context);
1195 if (ret < 0)
1196 dev_warn(&client->dev, "setup failed, %d\n", ret);
1197 }
1198
1199 return 0;
1200
1201err_exit:
1202 regulator_disable(chip->regulator);
1203 return ret;
1204}
1205
1206static void pca953x_remove(struct i2c_client *client)
1207{
1208 struct pca953x_platform_data *pdata = dev_get_platdata(&client->dev);
1209 struct pca953x_chip *chip = i2c_get_clientdata(client);
1210
1211 if (pdata && pdata->teardown) {
1212 pdata->teardown(client, chip->gpio_chip.base,
1213 chip->gpio_chip.ngpio, pdata->context);
1214 }
1215
1216 regulator_disable(chip->regulator);
1217}
1218
1219#ifdef CONFIG_PM_SLEEP
1220static int pca953x_regcache_sync(struct device *dev)
1221{
1222 struct pca953x_chip *chip = dev_get_drvdata(dev);
1223 int ret;
1224 u8 regaddr;
1225
1226 /*
1227 * The ordering between direction and output is important,
1228 * sync these registers first and only then sync the rest.
1229 */
1230 regaddr = chip->recalc_addr(chip, chip->regs->direction, 0);
1231 ret = regcache_sync_region(chip->regmap, regaddr, regaddr + NBANK(chip) - 1);
1232 if (ret) {
1233 dev_err(dev, "Failed to sync GPIO dir registers: %d\n", ret);
1234 return ret;
1235 }
1236
1237 regaddr = chip->recalc_addr(chip, chip->regs->output, 0);
1238 ret = regcache_sync_region(chip->regmap, regaddr, regaddr + NBANK(chip) - 1);
1239 if (ret) {
1240 dev_err(dev, "Failed to sync GPIO out registers: %d\n", ret);
1241 return ret;
1242 }
1243
1244#ifdef CONFIG_GPIO_PCA953X_IRQ
1245 if (chip->driver_data & PCA_PCAL) {
1246 regaddr = chip->recalc_addr(chip, PCAL953X_IN_LATCH, 0);
1247 ret = regcache_sync_region(chip->regmap, regaddr,
1248 regaddr + NBANK(chip) - 1);
1249 if (ret) {
1250 dev_err(dev, "Failed to sync INT latch registers: %d\n",
1251 ret);
1252 return ret;
1253 }
1254
1255 regaddr = chip->recalc_addr(chip, PCAL953X_INT_MASK, 0);
1256 ret = regcache_sync_region(chip->regmap, regaddr,
1257 regaddr + NBANK(chip) - 1);
1258 if (ret) {
1259 dev_err(dev, "Failed to sync INT mask registers: %d\n",
1260 ret);
1261 return ret;
1262 }
1263 }
1264#endif
1265
1266 return 0;
1267}
1268
1269static int pca953x_suspend(struct device *dev)
1270{
1271 struct pca953x_chip *chip = dev_get_drvdata(dev);
1272
1273 mutex_lock(&chip->i2c_lock);
1274 regcache_cache_only(chip->regmap, true);
1275 mutex_unlock(&chip->i2c_lock);
1276
1277 if (atomic_read(&chip->wakeup_path))
1278 device_set_wakeup_path(dev);
1279 else
1280 regulator_disable(chip->regulator);
1281
1282 return 0;
1283}
1284
1285static int pca953x_resume(struct device *dev)
1286{
1287 struct pca953x_chip *chip = dev_get_drvdata(dev);
1288 int ret;
1289
1290 if (!atomic_read(&chip->wakeup_path)) {
1291 ret = regulator_enable(chip->regulator);
1292 if (ret) {
1293 dev_err(dev, "Failed to enable regulator: %d\n", ret);
1294 return 0;
1295 }
1296 }
1297
1298 mutex_lock(&chip->i2c_lock);
1299 regcache_cache_only(chip->regmap, false);
1300 regcache_mark_dirty(chip->regmap);
1301 ret = pca953x_regcache_sync(dev);
1302 if (ret) {
1303 mutex_unlock(&chip->i2c_lock);
1304 return ret;
1305 }
1306
1307 ret = regcache_sync(chip->regmap);
1308 mutex_unlock(&chip->i2c_lock);
1309 if (ret) {
1310 dev_err(dev, "Failed to restore register map: %d\n", ret);
1311 return ret;
1312 }
1313
1314 return 0;
1315}
1316#endif
1317
1318/* convenience to stop overlong match-table lines */
1319#define OF_653X(__nrgpio, __int) ((void *)(__nrgpio | PCAL653X_TYPE | __int))
1320#define OF_953X(__nrgpio, __int) (void *)(__nrgpio | PCA953X_TYPE | __int)
1321#define OF_957X(__nrgpio, __int) (void *)(__nrgpio | PCA957X_TYPE | __int)
1322
1323static const struct of_device_id pca953x_dt_ids[] = {
1324 { .compatible = "nxp,pca6408", .data = OF_953X(8, PCA_INT), },
1325 { .compatible = "nxp,pca6416", .data = OF_953X(16, PCA_INT), },
1326 { .compatible = "nxp,pca9505", .data = OF_953X(40, PCA_INT), },
1327 { .compatible = "nxp,pca9506", .data = OF_953X(40, PCA_INT), },
1328 { .compatible = "nxp,pca9534", .data = OF_953X( 8, PCA_INT), },
1329 { .compatible = "nxp,pca9535", .data = OF_953X(16, PCA_INT), },
1330 { .compatible = "nxp,pca9536", .data = OF_953X( 4, 0), },
1331 { .compatible = "nxp,pca9537", .data = OF_953X( 4, PCA_INT), },
1332 { .compatible = "nxp,pca9538", .data = OF_953X( 8, PCA_INT), },
1333 { .compatible = "nxp,pca9539", .data = OF_953X(16, PCA_INT), },
1334 { .compatible = "nxp,pca9554", .data = OF_953X( 8, PCA_INT), },
1335 { .compatible = "nxp,pca9555", .data = OF_953X(16, PCA_INT), },
1336 { .compatible = "nxp,pca9556", .data = OF_953X( 8, 0), },
1337 { .compatible = "nxp,pca9557", .data = OF_953X( 8, 0), },
1338 { .compatible = "nxp,pca9574", .data = OF_957X( 8, PCA_INT), },
1339 { .compatible = "nxp,pca9575", .data = OF_957X(16, PCA_INT), },
1340 { .compatible = "nxp,pca9698", .data = OF_953X(40, 0), },
1341
1342 { .compatible = "nxp,pcal6408", .data = OF_953X(8, PCA_LATCH_INT), },
1343 { .compatible = "nxp,pcal6416", .data = OF_953X(16, PCA_LATCH_INT), },
1344 { .compatible = "nxp,pcal6524", .data = OF_953X(24, PCA_LATCH_INT), },
1345 { .compatible = "nxp,pcal6534", .data = OF_653X(34, PCA_LATCH_INT), },
1346 { .compatible = "nxp,pcal9535", .data = OF_953X(16, PCA_LATCH_INT), },
1347 { .compatible = "nxp,pcal9554b", .data = OF_953X( 8, PCA_LATCH_INT), },
1348 { .compatible = "nxp,pcal9555a", .data = OF_953X(16, PCA_LATCH_INT), },
1349
1350 { .compatible = "maxim,max7310", .data = OF_953X( 8, 0), },
1351 { .compatible = "maxim,max7312", .data = OF_953X(16, PCA_INT), },
1352 { .compatible = "maxim,max7313", .data = OF_953X(16, PCA_INT), },
1353 { .compatible = "maxim,max7315", .data = OF_953X( 8, PCA_INT), },
1354 { .compatible = "maxim,max7318", .data = OF_953X(16, PCA_INT), },
1355
1356 { .compatible = "ti,pca6107", .data = OF_953X( 8, PCA_INT), },
1357 { .compatible = "ti,pca9536", .data = OF_953X( 4, 0), },
1358 { .compatible = "ti,tca6408", .data = OF_953X( 8, PCA_INT), },
1359 { .compatible = "ti,tca6416", .data = OF_953X(16, PCA_INT), },
1360 { .compatible = "ti,tca6424", .data = OF_953X(24, PCA_INT), },
1361 { .compatible = "ti,tca9539", .data = OF_953X(16, PCA_INT), },
1362
1363 { .compatible = "onnn,cat9554", .data = OF_953X( 8, PCA_INT), },
1364 { .compatible = "onnn,pca9654", .data = OF_953X( 8, PCA_INT), },
1365 { .compatible = "onnn,pca9655", .data = OF_953X(16, PCA_INT), },
1366
1367 { .compatible = "exar,xra1202", .data = OF_953X( 8, 0), },
1368 { }
1369};
1370
1371MODULE_DEVICE_TABLE(of, pca953x_dt_ids);
1372
1373static SIMPLE_DEV_PM_OPS(pca953x_pm_ops, pca953x_suspend, pca953x_resume);
1374
1375static struct i2c_driver pca953x_driver = {
1376 .driver = {
1377 .name = "pca953x",
1378 .pm = &pca953x_pm_ops,
1379 .of_match_table = pca953x_dt_ids,
1380 .acpi_match_table = pca953x_acpi_ids,
1381 },
1382 .probe_new = pca953x_probe,
1383 .remove = pca953x_remove,
1384 .id_table = pca953x_id,
1385};
1386
1387static int __init pca953x_init(void)
1388{
1389 return i2c_add_driver(&pca953x_driver);
1390}
1391/* register after i2c postcore initcall and before
1392 * subsys initcalls that may rely on these GPIOs
1393 */
1394subsys_initcall(pca953x_init);
1395
1396static void __exit pca953x_exit(void)
1397{
1398 i2c_del_driver(&pca953x_driver);
1399}
1400module_exit(pca953x_exit);
1401
1402MODULE_AUTHOR("eric miao <eric.miao@marvell.com>");
1403MODULE_DESCRIPTION("GPIO expander driver for PCA953x");
1404MODULE_LICENSE("GPL");
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
55static 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};
86MODULE_DEVICE_TABLE(i2c, pca953x_id);
87
88static const struct acpi_device_id pca953x_acpi_ids[] = {
89 { "INT3491", 16 | PCA953X_TYPE | PCA_INT | PCA_PCAL, },
90 { }
91};
92MODULE_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
99struct pca953x_reg_config {
100 int direction;
101 int output;
102 int input;
103};
104
105static const struct pca953x_reg_config pca953x_regs = {
106 .direction = PCA953X_DIRECTION,
107 .output = PCA953X_OUTPUT,
108 .input = PCA953X_INPUT,
109};
110
111static const struct pca953x_reg_config pca957x_regs = {
112 .direction = PCA957X_CFG,
113 .output = PCA957X_OUT,
114 .input = PCA957X_IN,
115};
116
117struct 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
143static 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
162static 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
180static 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
185static 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
193static 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
204static 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
213static 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
226static 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
236static 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
247static 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
256static 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
269static 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;
283exit:
284 mutex_unlock(&chip->i2c_lock);
285 return ret;
286}
287
288static 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;
317exit:
318 mutex_unlock(&chip->i2c_lock);
319 return ret;
320}
321
322static 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, ®_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
342static 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;
361exit:
362 mutex_unlock(&chip->i2c_lock);
363}
364
365static 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));
396exit:
397 mutex_unlock(&chip->i2c_lock);
398}
399
400static 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
422static 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
430static 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
438static 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
446static 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
481static 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
507static 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
516static 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
580static 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
604static 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 */
659static 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
671static 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);
694out:
695 return ret;
696}
697
698static 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;
729out:
730 return ret;
731}
732
733static const struct of_device_id pca953x_dt_ids[];
734
735static 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
861err_exit:
862 regulator_disable(chip->regulator);
863 return ret;
864}
865
866static 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
891static 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
925MODULE_DEVICE_TABLE(of, pca953x_dt_ids);
926
927static 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
938static 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 */
945subsys_initcall(pca953x_init);
946
947static void __exit pca953x_exit(void)
948{
949 i2c_del_driver(&pca953x_driver);
950}
951module_exit(pca953x_exit);
952
953MODULE_AUTHOR("eric miao <eric.miao@marvell.com>");
954MODULE_DESCRIPTION("GPIO expander driver for PCA953x");
955MODULE_LICENSE("GPL");