1 // SPDX-License-Identifier: GPL-2.0-only
3 * PCA953x 4/8/16/24/40 bit I/O ports
5 * Copyright (C) 2005 Ben Gardner <bgardner@wabtec.com>
6 * Copyright (C) 2007 Marvell International Ltd.
8 * Derived from drivers/i2c/chips/pca9539.c
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>
26 #include <asm/unaligned.h>
28 #define PCA953X_INPUT 0x00
29 #define PCA953X_OUTPUT 0x01
30 #define PCA953X_INVERT 0x02
31 #define PCA953X_DIRECTION 0x03
33 #define REG_ADDR_MASK GENMASK(5, 0)
34 #define REG_ADDR_EXT BIT(6)
35 #define REG_ADDR_AI BIT(7)
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
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
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
60 #define PCA_GPIO_MASK GENMASK(7, 0)
62 #define PCAL_GPIO_MASK GENMASK(4, 0)
63 #define PCAL_PINCTRL_MASK GENMASK(6, 5)
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)
73 #define PCA_CHIP_TYPE(x) ((x) & PCA_TYPE_MASK)
75 static 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, },
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, },
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 { "tca9538", 8 | PCA953X_TYPE | PCA_INT, },
112 { "tca9539", 16 | PCA953X_TYPE | PCA_INT, },
113 { "tca9554", 8 | PCA953X_TYPE | PCA_INT, },
114 { "xra1202", 8 | PCA953X_TYPE },
117 MODULE_DEVICE_TABLE(i2c, pca953x_id);
119 #ifdef CONFIG_GPIO_PCA953X_IRQ
121 #include <linux/dmi.h>
123 static const struct acpi_gpio_params pca953x_irq_gpios = { 0, 0, true };
125 static const struct acpi_gpio_mapping pca953x_acpi_irq_gpios[] = {
126 { "irq-gpios", &pca953x_irq_gpios, 1, ACPI_GPIO_QUIRK_ABSOLUTE_NUMBER },
130 static int pca953x_acpi_get_irq(struct device *dev)
134 ret = devm_acpi_dev_add_driver_gpios(dev, pca953x_acpi_irq_gpios);
136 dev_warn(dev, "can't add GPIO ACPI mapping\n");
138 ret = acpi_dev_gpio_irq_get_by(ACPI_COMPANION(dev), "irq-gpios", 0);
142 dev_info(dev, "ACPI interrupt quirk (IRQ %d)\n", ret);
146 static const struct dmi_system_id pca953x_dmi_acpi_irq_info[] = {
149 * On Intel Galileo Gen 2 board the IRQ pin of one of
150 * the I²C GPIO expanders, which has GpioInt() resource,
151 * is provided as an absolute number instead of being
152 * relative. Since first controller (gpio-sch.c) and
153 * second (gpio-dwapb.c) are at the fixed bases, we may
154 * safely refer to the number in the global space to get
158 DMI_EXACT_MATCH(DMI_BOARD_NAME, "GalileoGen2"),
165 static const struct acpi_device_id pca953x_acpi_ids[] = {
166 { "INT3491", 16 | PCA953X_TYPE | PCA_LATCH_INT, },
169 MODULE_DEVICE_TABLE(acpi, pca953x_acpi_ids);
173 #define MAX_LINE (MAX_BANK * BANK_SZ)
175 #define NBANK(chip) DIV_ROUND_UP(chip->gpio_chip.ngpio, BANK_SZ)
177 struct pca953x_reg_config {
184 static const struct pca953x_reg_config pca953x_regs = {
185 .direction = PCA953X_DIRECTION,
186 .output = PCA953X_OUTPUT,
187 .input = PCA953X_INPUT,
188 .invert = PCA953X_INVERT,
191 static const struct pca953x_reg_config pca957x_regs = {
192 .direction = PCA957X_CFG,
193 .output = PCA957X_OUT,
195 .invert = PCA957X_INVRT,
198 struct pca953x_chip {
200 struct mutex i2c_lock;
201 struct regmap *regmap;
203 #ifdef CONFIG_GPIO_PCA953X_IRQ
204 struct mutex irq_lock;
205 DECLARE_BITMAP(irq_mask, MAX_LINE);
206 DECLARE_BITMAP(irq_stat, MAX_LINE);
207 DECLARE_BITMAP(irq_trig_raise, MAX_LINE);
208 DECLARE_BITMAP(irq_trig_fall, MAX_LINE);
210 atomic_t wakeup_path;
212 struct i2c_client *client;
213 struct gpio_chip gpio_chip;
214 const char *const *names;
215 unsigned long driver_data;
216 struct regulator *regulator;
218 const struct pca953x_reg_config *regs;
220 u8 (*recalc_addr)(struct pca953x_chip *chip, int reg, int off);
221 bool (*check_reg)(struct pca953x_chip *chip, unsigned int reg,
225 static int pca953x_bank_shift(struct pca953x_chip *chip)
227 return fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
230 #define PCA953x_BANK_INPUT BIT(0)
231 #define PCA953x_BANK_OUTPUT BIT(1)
232 #define PCA953x_BANK_POLARITY BIT(2)
233 #define PCA953x_BANK_CONFIG BIT(3)
235 #define PCA957x_BANK_INPUT BIT(0)
236 #define PCA957x_BANK_POLARITY BIT(1)
237 #define PCA957x_BANK_BUSHOLD BIT(2)
238 #define PCA957x_BANK_CONFIG BIT(4)
239 #define PCA957x_BANK_OUTPUT BIT(5)
241 #define PCAL9xxx_BANK_IN_LATCH BIT(8 + 2)
242 #define PCAL9xxx_BANK_PULL_EN BIT(8 + 3)
243 #define PCAL9xxx_BANK_PULL_SEL BIT(8 + 4)
244 #define PCAL9xxx_BANK_IRQ_MASK BIT(8 + 5)
245 #define PCAL9xxx_BANK_IRQ_STAT BIT(8 + 6)
248 * We care about the following registers:
249 * - Standard set, below 0x40, each port can be replicated up to 8 times
251 * Input port 0x00 + 0 * bank_size R
252 * Output port 0x00 + 1 * bank_size RW
253 * Polarity Inversion port 0x00 + 2 * bank_size RW
254 * Configuration port 0x00 + 3 * bank_size RW
255 * - PCA957x with mixed up registers
256 * Input port 0x00 + 0 * bank_size R
257 * Polarity Inversion port 0x00 + 1 * bank_size RW
258 * Bus hold port 0x00 + 2 * bank_size RW
259 * Configuration port 0x00 + 4 * bank_size RW
260 * Output port 0x00 + 5 * bank_size RW
262 * - Extended set, above 0x40, often chip specific.
263 * - PCAL6524/PCAL9555A with custom PCAL IRQ handling:
264 * Input latch register 0x40 + 2 * bank_size RW
265 * Pull-up/pull-down enable reg 0x40 + 3 * bank_size RW
266 * Pull-up/pull-down select reg 0x40 + 4 * bank_size RW
267 * Interrupt mask register 0x40 + 5 * bank_size RW
268 * Interrupt status register 0x40 + 6 * bank_size R
270 * - Registers with bit 0x80 set, the AI bit
271 * The bit is cleared and the registers fall into one of the
275 static bool pca953x_check_register(struct pca953x_chip *chip, unsigned int reg,
278 int bank_shift = pca953x_bank_shift(chip);
279 int bank = (reg & REG_ADDR_MASK) >> bank_shift;
280 int offset = reg & (BIT(bank_shift) - 1);
282 /* Special PCAL extended register check. */
283 if (reg & REG_ADDR_EXT) {
284 if (!(chip->driver_data & PCA_PCAL))
289 /* Register is not in the matching bank. */
290 if (!(BIT(bank) & checkbank))
293 /* Register is not within allowed range of bank. */
294 if (offset >= NBANK(chip))
301 * Unfortunately, whilst the PCAL6534 chip (and compatibles) broadly follow the
302 * same register layout as the PCAL6524, the spacing of the registers has been
303 * fundamentally altered by compacting them and thus does not obey the same
304 * rules, including being able to use bit shifting to determine bank. These
305 * chips hence need special handling here.
307 static bool pcal6534_check_register(struct pca953x_chip *chip, unsigned int reg,
316 * Handle lack of reserved registers after output port
317 * configuration register to form a bank.
321 } else if (reg >= 0x30) {
323 * Reserved block between 14h and 2Fh does not align on
324 * expected bank boundaries like other devices.
332 bank = bank_shift + reg / NBANK(chip);
333 offset = reg % NBANK(chip);
335 /* Register is not in the matching bank. */
336 if (!(BIT(bank) & checkbank))
339 /* Register is not within allowed range of bank. */
340 if (offset >= NBANK(chip))
346 static bool pca953x_readable_register(struct device *dev, unsigned int reg)
348 struct pca953x_chip *chip = dev_get_drvdata(dev);
351 if (PCA_CHIP_TYPE(chip->driver_data) == PCA957X_TYPE) {
352 bank = PCA957x_BANK_INPUT | PCA957x_BANK_OUTPUT |
353 PCA957x_BANK_POLARITY | PCA957x_BANK_CONFIG |
354 PCA957x_BANK_BUSHOLD;
356 bank = PCA953x_BANK_INPUT | PCA953x_BANK_OUTPUT |
357 PCA953x_BANK_POLARITY | PCA953x_BANK_CONFIG;
360 if (chip->driver_data & PCA_PCAL) {
361 bank |= PCAL9xxx_BANK_IN_LATCH | PCAL9xxx_BANK_PULL_EN |
362 PCAL9xxx_BANK_PULL_SEL | PCAL9xxx_BANK_IRQ_MASK |
363 PCAL9xxx_BANK_IRQ_STAT;
366 return chip->check_reg(chip, reg, bank);
369 static bool pca953x_writeable_register(struct device *dev, unsigned int reg)
371 struct pca953x_chip *chip = dev_get_drvdata(dev);
374 if (PCA_CHIP_TYPE(chip->driver_data) == PCA957X_TYPE) {
375 bank = PCA957x_BANK_OUTPUT | PCA957x_BANK_POLARITY |
376 PCA957x_BANK_CONFIG | PCA957x_BANK_BUSHOLD;
378 bank = PCA953x_BANK_OUTPUT | PCA953x_BANK_POLARITY |
382 if (chip->driver_data & PCA_PCAL)
383 bank |= PCAL9xxx_BANK_IN_LATCH | PCAL9xxx_BANK_PULL_EN |
384 PCAL9xxx_BANK_PULL_SEL | PCAL9xxx_BANK_IRQ_MASK;
386 return chip->check_reg(chip, reg, bank);
389 static bool pca953x_volatile_register(struct device *dev, unsigned int reg)
391 struct pca953x_chip *chip = dev_get_drvdata(dev);
394 if (PCA_CHIP_TYPE(chip->driver_data) == PCA957X_TYPE)
395 bank = PCA957x_BANK_INPUT;
397 bank = PCA953x_BANK_INPUT;
399 if (chip->driver_data & PCA_PCAL)
400 bank |= PCAL9xxx_BANK_IRQ_STAT;
402 return chip->check_reg(chip, reg, bank);
405 static const struct regmap_config pca953x_i2c_regmap = {
409 .use_single_read = true,
410 .use_single_write = true,
412 .readable_reg = pca953x_readable_register,
413 .writeable_reg = pca953x_writeable_register,
414 .volatile_reg = pca953x_volatile_register,
416 .disable_locking = true,
417 .cache_type = REGCACHE_RBTREE,
418 .max_register = 0x7f,
421 static const struct regmap_config pca953x_ai_i2c_regmap = {
425 .read_flag_mask = REG_ADDR_AI,
426 .write_flag_mask = REG_ADDR_AI,
428 .readable_reg = pca953x_readable_register,
429 .writeable_reg = pca953x_writeable_register,
430 .volatile_reg = pca953x_volatile_register,
432 .disable_locking = true,
433 .cache_type = REGCACHE_RBTREE,
434 .max_register = 0x7f,
437 static u8 pca953x_recalc_addr(struct pca953x_chip *chip, int reg, int off)
439 int bank_shift = pca953x_bank_shift(chip);
440 int addr = (reg & PCAL_GPIO_MASK) << bank_shift;
441 int pinctrl = (reg & PCAL_PINCTRL_MASK) << 1;
442 u8 regaddr = pinctrl | addr | (off / BANK_SZ);
448 * The PCAL6534 and compatible chips have altered bank alignment that doesn't
449 * fit within the bit shifting scheme used for other devices.
451 static u8 pcal6534_recalc_addr(struct pca953x_chip *chip, int reg, int off)
456 addr = (reg & PCAL_GPIO_MASK) * NBANK(chip);
459 case PCAL953X_OUT_STRENGTH:
460 case PCAL953X_IN_LATCH:
461 case PCAL953X_PULL_EN:
462 case PCAL953X_PULL_SEL:
463 case PCAL953X_INT_MASK:
464 case PCAL953X_INT_STAT:
465 pinctrl = ((reg & PCAL_PINCTRL_MASK) >> 1) + 0x20;
467 case PCAL6524_INT_EDGE:
468 case PCAL6524_INT_CLR:
469 case PCAL6524_IN_STATUS:
470 case PCAL6524_OUT_INDCONF:
471 case PCAL6524_DEBOUNCE:
472 pinctrl = ((reg & PCAL_PINCTRL_MASK) >> 1) + 0x1c;
479 return pinctrl + addr + (off / BANK_SZ);
482 static int pca953x_write_regs(struct pca953x_chip *chip, int reg, unsigned long *val)
484 u8 regaddr = chip->recalc_addr(chip, reg, 0);
488 for (i = 0; i < NBANK(chip); i++)
489 value[i] = bitmap_get_value8(val, i * BANK_SZ);
491 ret = regmap_bulk_write(chip->regmap, regaddr, value, NBANK(chip));
493 dev_err(&chip->client->dev, "failed writing register\n");
500 static int pca953x_read_regs(struct pca953x_chip *chip, int reg, unsigned long *val)
502 u8 regaddr = chip->recalc_addr(chip, reg, 0);
506 ret = regmap_bulk_read(chip->regmap, regaddr, value, NBANK(chip));
508 dev_err(&chip->client->dev, "failed reading register\n");
512 for (i = 0; i < NBANK(chip); i++)
513 bitmap_set_value8(val, value[i], i * BANK_SZ);
518 static int pca953x_gpio_direction_input(struct gpio_chip *gc, unsigned off)
520 struct pca953x_chip *chip = gpiochip_get_data(gc);
521 u8 dirreg = chip->recalc_addr(chip, chip->regs->direction, off);
522 u8 bit = BIT(off % BANK_SZ);
525 mutex_lock(&chip->i2c_lock);
526 ret = regmap_write_bits(chip->regmap, dirreg, bit, bit);
527 mutex_unlock(&chip->i2c_lock);
531 static int pca953x_gpio_direction_output(struct gpio_chip *gc,
532 unsigned off, int val)
534 struct pca953x_chip *chip = gpiochip_get_data(gc);
535 u8 dirreg = chip->recalc_addr(chip, chip->regs->direction, off);
536 u8 outreg = chip->recalc_addr(chip, chip->regs->output, off);
537 u8 bit = BIT(off % BANK_SZ);
540 mutex_lock(&chip->i2c_lock);
541 /* set output level */
542 ret = regmap_write_bits(chip->regmap, outreg, bit, val ? bit : 0);
547 ret = regmap_write_bits(chip->regmap, dirreg, bit, 0);
549 mutex_unlock(&chip->i2c_lock);
553 static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off)
555 struct pca953x_chip *chip = gpiochip_get_data(gc);
556 u8 inreg = chip->recalc_addr(chip, chip->regs->input, off);
557 u8 bit = BIT(off % BANK_SZ);
561 mutex_lock(&chip->i2c_lock);
562 ret = regmap_read(chip->regmap, inreg, ®_val);
563 mutex_unlock(&chip->i2c_lock);
567 return !!(reg_val & bit);
570 static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val)
572 struct pca953x_chip *chip = gpiochip_get_data(gc);
573 u8 outreg = chip->recalc_addr(chip, chip->regs->output, off);
574 u8 bit = BIT(off % BANK_SZ);
576 mutex_lock(&chip->i2c_lock);
577 regmap_write_bits(chip->regmap, outreg, bit, val ? bit : 0);
578 mutex_unlock(&chip->i2c_lock);
581 static int pca953x_gpio_get_direction(struct gpio_chip *gc, unsigned off)
583 struct pca953x_chip *chip = gpiochip_get_data(gc);
584 u8 dirreg = chip->recalc_addr(chip, chip->regs->direction, off);
585 u8 bit = BIT(off % BANK_SZ);
589 mutex_lock(&chip->i2c_lock);
590 ret = regmap_read(chip->regmap, dirreg, ®_val);
591 mutex_unlock(&chip->i2c_lock);
596 return GPIO_LINE_DIRECTION_IN;
598 return GPIO_LINE_DIRECTION_OUT;
601 static int pca953x_gpio_get_multiple(struct gpio_chip *gc,
602 unsigned long *mask, unsigned long *bits)
604 struct pca953x_chip *chip = gpiochip_get_data(gc);
605 DECLARE_BITMAP(reg_val, MAX_LINE);
608 mutex_lock(&chip->i2c_lock);
609 ret = pca953x_read_regs(chip, chip->regs->input, reg_val);
610 mutex_unlock(&chip->i2c_lock);
614 bitmap_replace(bits, bits, reg_val, mask, gc->ngpio);
618 static void pca953x_gpio_set_multiple(struct gpio_chip *gc,
619 unsigned long *mask, unsigned long *bits)
621 struct pca953x_chip *chip = gpiochip_get_data(gc);
622 DECLARE_BITMAP(reg_val, MAX_LINE);
625 mutex_lock(&chip->i2c_lock);
626 ret = pca953x_read_regs(chip, chip->regs->output, reg_val);
630 bitmap_replace(reg_val, reg_val, bits, mask, gc->ngpio);
632 pca953x_write_regs(chip, chip->regs->output, reg_val);
634 mutex_unlock(&chip->i2c_lock);
637 static int pca953x_gpio_set_pull_up_down(struct pca953x_chip *chip,
639 unsigned long config)
641 enum pin_config_param param = pinconf_to_config_param(config);
643 u8 pull_en_reg = chip->recalc_addr(chip, PCAL953X_PULL_EN, offset);
644 u8 pull_sel_reg = chip->recalc_addr(chip, PCAL953X_PULL_SEL, offset);
645 u8 bit = BIT(offset % BANK_SZ);
649 * pull-up/pull-down configuration requires PCAL extended
652 if (!(chip->driver_data & PCA_PCAL))
655 mutex_lock(&chip->i2c_lock);
657 /* Configure pull-up/pull-down */
658 if (param == PIN_CONFIG_BIAS_PULL_UP)
659 ret = regmap_write_bits(chip->regmap, pull_sel_reg, bit, bit);
660 else if (param == PIN_CONFIG_BIAS_PULL_DOWN)
661 ret = regmap_write_bits(chip->regmap, pull_sel_reg, bit, 0);
667 /* Disable/Enable pull-up/pull-down */
668 if (param == PIN_CONFIG_BIAS_DISABLE)
669 ret = regmap_write_bits(chip->regmap, pull_en_reg, bit, 0);
671 ret = regmap_write_bits(chip->regmap, pull_en_reg, bit, bit);
674 mutex_unlock(&chip->i2c_lock);
678 static int pca953x_gpio_set_config(struct gpio_chip *gc, unsigned int offset,
679 unsigned long config)
681 struct pca953x_chip *chip = gpiochip_get_data(gc);
683 switch (pinconf_to_config_param(config)) {
684 case PIN_CONFIG_BIAS_PULL_UP:
685 case PIN_CONFIG_BIAS_PULL_PIN_DEFAULT:
686 case PIN_CONFIG_BIAS_PULL_DOWN:
687 case PIN_CONFIG_BIAS_DISABLE:
688 return pca953x_gpio_set_pull_up_down(chip, offset, config);
694 static void pca953x_setup_gpio(struct pca953x_chip *chip, int gpios)
696 struct gpio_chip *gc;
698 gc = &chip->gpio_chip;
700 gc->direction_input = pca953x_gpio_direction_input;
701 gc->direction_output = pca953x_gpio_direction_output;
702 gc->get = pca953x_gpio_get_value;
703 gc->set = pca953x_gpio_set_value;
704 gc->get_direction = pca953x_gpio_get_direction;
705 gc->get_multiple = pca953x_gpio_get_multiple;
706 gc->set_multiple = pca953x_gpio_set_multiple;
707 gc->set_config = pca953x_gpio_set_config;
708 gc->can_sleep = true;
710 gc->base = chip->gpio_start;
712 gc->label = dev_name(&chip->client->dev);
713 gc->parent = &chip->client->dev;
714 gc->owner = THIS_MODULE;
715 gc->names = chip->names;
718 #ifdef CONFIG_GPIO_PCA953X_IRQ
719 static void pca953x_irq_mask(struct irq_data *d)
721 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
722 struct pca953x_chip *chip = gpiochip_get_data(gc);
723 irq_hw_number_t hwirq = irqd_to_hwirq(d);
725 clear_bit(hwirq, chip->irq_mask);
726 gpiochip_disable_irq(gc, hwirq);
729 static void pca953x_irq_unmask(struct irq_data *d)
731 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
732 struct pca953x_chip *chip = gpiochip_get_data(gc);
733 irq_hw_number_t hwirq = irqd_to_hwirq(d);
735 gpiochip_enable_irq(gc, hwirq);
736 set_bit(hwirq, chip->irq_mask);
739 static int pca953x_irq_set_wake(struct irq_data *d, unsigned int on)
741 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
742 struct pca953x_chip *chip = gpiochip_get_data(gc);
745 atomic_inc(&chip->wakeup_path);
747 atomic_dec(&chip->wakeup_path);
749 return irq_set_irq_wake(chip->client->irq, on);
752 static void pca953x_irq_bus_lock(struct irq_data *d)
754 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
755 struct pca953x_chip *chip = gpiochip_get_data(gc);
757 mutex_lock(&chip->irq_lock);
760 static void pca953x_irq_bus_sync_unlock(struct irq_data *d)
762 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
763 struct pca953x_chip *chip = gpiochip_get_data(gc);
764 DECLARE_BITMAP(irq_mask, MAX_LINE);
765 DECLARE_BITMAP(reg_direction, MAX_LINE);
768 if (chip->driver_data & PCA_PCAL) {
769 /* Enable latch on interrupt-enabled inputs */
770 pca953x_write_regs(chip, PCAL953X_IN_LATCH, chip->irq_mask);
772 bitmap_complement(irq_mask, chip->irq_mask, gc->ngpio);
774 /* Unmask enabled interrupts */
775 pca953x_write_regs(chip, PCAL953X_INT_MASK, irq_mask);
778 /* Switch direction to input if needed */
779 pca953x_read_regs(chip, chip->regs->direction, reg_direction);
781 bitmap_or(irq_mask, chip->irq_trig_fall, chip->irq_trig_raise, gc->ngpio);
782 bitmap_complement(reg_direction, reg_direction, gc->ngpio);
783 bitmap_and(irq_mask, irq_mask, reg_direction, gc->ngpio);
785 /* Look for any newly setup interrupt */
786 for_each_set_bit(level, irq_mask, gc->ngpio)
787 pca953x_gpio_direction_input(&chip->gpio_chip, level);
789 mutex_unlock(&chip->irq_lock);
792 static int pca953x_irq_set_type(struct irq_data *d, unsigned int type)
794 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
795 struct pca953x_chip *chip = gpiochip_get_data(gc);
796 irq_hw_number_t hwirq = irqd_to_hwirq(d);
798 if (!(type & IRQ_TYPE_EDGE_BOTH)) {
799 dev_err(&chip->client->dev, "irq %d: unsupported type %d\n",
804 assign_bit(hwirq, chip->irq_trig_fall, type & IRQ_TYPE_EDGE_FALLING);
805 assign_bit(hwirq, chip->irq_trig_raise, type & IRQ_TYPE_EDGE_RISING);
810 static void pca953x_irq_shutdown(struct irq_data *d)
812 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
813 struct pca953x_chip *chip = gpiochip_get_data(gc);
814 irq_hw_number_t hwirq = irqd_to_hwirq(d);
816 clear_bit(hwirq, chip->irq_trig_raise);
817 clear_bit(hwirq, chip->irq_trig_fall);
820 static void pca953x_irq_print_chip(struct irq_data *data, struct seq_file *p)
822 struct gpio_chip *gc = irq_data_get_irq_chip_data(data);
824 seq_printf(p, dev_name(gc->parent));
827 static const struct irq_chip pca953x_irq_chip = {
828 .irq_mask = pca953x_irq_mask,
829 .irq_unmask = pca953x_irq_unmask,
830 .irq_set_wake = pca953x_irq_set_wake,
831 .irq_bus_lock = pca953x_irq_bus_lock,
832 .irq_bus_sync_unlock = pca953x_irq_bus_sync_unlock,
833 .irq_set_type = pca953x_irq_set_type,
834 .irq_shutdown = pca953x_irq_shutdown,
835 .irq_print_chip = pca953x_irq_print_chip,
836 .flags = IRQCHIP_IMMUTABLE,
837 GPIOCHIP_IRQ_RESOURCE_HELPERS,
840 static bool pca953x_irq_pending(struct pca953x_chip *chip, unsigned long *pending)
842 struct gpio_chip *gc = &chip->gpio_chip;
843 DECLARE_BITMAP(reg_direction, MAX_LINE);
844 DECLARE_BITMAP(old_stat, MAX_LINE);
845 DECLARE_BITMAP(cur_stat, MAX_LINE);
846 DECLARE_BITMAP(new_stat, MAX_LINE);
847 DECLARE_BITMAP(trigger, MAX_LINE);
850 if (chip->driver_data & PCA_PCAL) {
851 /* Read the current interrupt status from the device */
852 ret = pca953x_read_regs(chip, PCAL953X_INT_STAT, trigger);
856 /* Check latched inputs and clear interrupt status */
857 ret = pca953x_read_regs(chip, chip->regs->input, cur_stat);
861 /* Apply filter for rising/falling edge selection */
862 bitmap_replace(new_stat, chip->irq_trig_fall, chip->irq_trig_raise, cur_stat, gc->ngpio);
864 bitmap_and(pending, new_stat, trigger, gc->ngpio);
866 return !bitmap_empty(pending, gc->ngpio);
869 ret = pca953x_read_regs(chip, chip->regs->input, cur_stat);
873 /* Remove output pins from the equation */
874 pca953x_read_regs(chip, chip->regs->direction, reg_direction);
876 bitmap_copy(old_stat, chip->irq_stat, gc->ngpio);
878 bitmap_and(new_stat, cur_stat, reg_direction, gc->ngpio);
879 bitmap_xor(cur_stat, new_stat, old_stat, gc->ngpio);
880 bitmap_and(trigger, cur_stat, chip->irq_mask, gc->ngpio);
882 bitmap_copy(chip->irq_stat, new_stat, gc->ngpio);
884 if (bitmap_empty(trigger, gc->ngpio))
887 bitmap_and(cur_stat, chip->irq_trig_fall, old_stat, gc->ngpio);
888 bitmap_and(old_stat, chip->irq_trig_raise, new_stat, gc->ngpio);
889 bitmap_or(new_stat, old_stat, cur_stat, gc->ngpio);
890 bitmap_and(pending, new_stat, trigger, gc->ngpio);
892 return !bitmap_empty(pending, gc->ngpio);
895 static irqreturn_t pca953x_irq_handler(int irq, void *devid)
897 struct pca953x_chip *chip = devid;
898 struct gpio_chip *gc = &chip->gpio_chip;
899 DECLARE_BITMAP(pending, MAX_LINE);
903 bitmap_zero(pending, MAX_LINE);
905 mutex_lock(&chip->i2c_lock);
906 ret = pca953x_irq_pending(chip, pending);
907 mutex_unlock(&chip->i2c_lock);
912 for_each_set_bit(level, pending, gc->ngpio) {
913 int nested_irq = irq_find_mapping(gc->irq.domain, level);
915 if (unlikely(nested_irq <= 0)) {
916 dev_warn_ratelimited(gc->parent, "unmapped interrupt %d\n", level);
920 handle_nested_irq(nested_irq);
925 return IRQ_RETVAL(ret);
928 static int pca953x_irq_setup(struct pca953x_chip *chip, int irq_base)
930 struct i2c_client *client = chip->client;
931 DECLARE_BITMAP(reg_direction, MAX_LINE);
932 DECLARE_BITMAP(irq_stat, MAX_LINE);
933 struct gpio_irq_chip *girq;
936 if (dmi_first_match(pca953x_dmi_acpi_irq_info)) {
937 ret = pca953x_acpi_get_irq(&client->dev);
948 if (!(chip->driver_data & PCA_INT))
951 ret = pca953x_read_regs(chip, chip->regs->input, irq_stat);
956 * There is no way to know which GPIO line generated the
957 * interrupt. We have to rely on the previous read for
960 pca953x_read_regs(chip, chip->regs->direction, reg_direction);
961 bitmap_and(chip->irq_stat, irq_stat, reg_direction, chip->gpio_chip.ngpio);
962 mutex_init(&chip->irq_lock);
964 girq = &chip->gpio_chip.irq;
965 gpio_irq_chip_set_chip(girq, &pca953x_irq_chip);
966 /* This will let us handle the parent IRQ in the driver */
967 girq->parent_handler = NULL;
968 girq->num_parents = 0;
969 girq->parents = NULL;
970 girq->default_type = IRQ_TYPE_NONE;
971 girq->handler = handle_simple_irq;
972 girq->threaded = true;
973 girq->first = irq_base; /* FIXME: get rid of this */
975 ret = devm_request_threaded_irq(&client->dev, client->irq,
976 NULL, pca953x_irq_handler,
977 IRQF_ONESHOT | IRQF_SHARED,
978 dev_name(&client->dev), chip);
980 dev_err(&client->dev, "failed to request irq %d\n",
988 #else /* CONFIG_GPIO_PCA953X_IRQ */
989 static int pca953x_irq_setup(struct pca953x_chip *chip,
992 struct i2c_client *client = chip->client;
994 if (client->irq && irq_base != -1 && (chip->driver_data & PCA_INT))
995 dev_warn(&client->dev, "interrupt support not compiled in\n");
1001 static int device_pca95xx_init(struct pca953x_chip *chip, u32 invert)
1003 DECLARE_BITMAP(val, MAX_LINE);
1007 regaddr = chip->recalc_addr(chip, chip->regs->output, 0);
1008 ret = regcache_sync_region(chip->regmap, regaddr,
1009 regaddr + NBANK(chip) - 1);
1013 regaddr = chip->recalc_addr(chip, chip->regs->direction, 0);
1014 ret = regcache_sync_region(chip->regmap, regaddr,
1015 regaddr + NBANK(chip) - 1);
1019 /* set platform specific polarity inversion */
1021 bitmap_fill(val, MAX_LINE);
1023 bitmap_zero(val, MAX_LINE);
1025 ret = pca953x_write_regs(chip, chip->regs->invert, val);
1030 static int device_pca957x_init(struct pca953x_chip *chip, u32 invert)
1032 DECLARE_BITMAP(val, MAX_LINE);
1036 ret = device_pca95xx_init(chip, invert);
1040 /* To enable register 6, 7 to control pull up and pull down */
1041 for (i = 0; i < NBANK(chip); i++)
1042 bitmap_set_value8(val, 0x02, i * BANK_SZ);
1044 ret = pca953x_write_regs(chip, PCA957X_BKEN, val);
1053 static int pca953x_probe(struct i2c_client *client)
1055 struct pca953x_platform_data *pdata;
1056 struct pca953x_chip *chip;
1060 struct regulator *reg;
1061 const struct regmap_config *regmap_config;
1063 chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
1067 pdata = dev_get_platdata(&client->dev);
1069 irq_base = pdata->irq_base;
1070 chip->gpio_start = pdata->gpio_base;
1071 invert = pdata->invert;
1072 chip->names = pdata->names;
1074 struct gpio_desc *reset_gpio;
1076 chip->gpio_start = -1;
1080 * See if we need to de-assert a reset pin.
1082 * There is no known ACPI-enabled platforms that are
1083 * using "reset" GPIO. Otherwise any of those platform
1084 * must use _DSD method with corresponding property.
1086 reset_gpio = devm_gpiod_get_optional(&client->dev, "reset",
1088 if (IS_ERR(reset_gpio))
1089 return PTR_ERR(reset_gpio);
1092 chip->client = client;
1093 chip->driver_data = (uintptr_t)i2c_get_match_data(client);
1094 if (!chip->driver_data)
1097 reg = devm_regulator_get(&client->dev, "vcc");
1099 return dev_err_probe(&client->dev, PTR_ERR(reg), "reg get err\n");
1101 ret = regulator_enable(reg);
1103 dev_err(&client->dev, "reg en err: %d\n", ret);
1106 chip->regulator = reg;
1108 i2c_set_clientdata(client, chip);
1110 pca953x_setup_gpio(chip, chip->driver_data & PCA_GPIO_MASK);
1112 if (NBANK(chip) > 2 || PCA_CHIP_TYPE(chip->driver_data) == PCA957X_TYPE) {
1113 dev_info(&client->dev, "using AI\n");
1114 regmap_config = &pca953x_ai_i2c_regmap;
1116 dev_info(&client->dev, "using no AI\n");
1117 regmap_config = &pca953x_i2c_regmap;
1120 if (PCA_CHIP_TYPE(chip->driver_data) == PCAL653X_TYPE) {
1121 chip->recalc_addr = pcal6534_recalc_addr;
1122 chip->check_reg = pcal6534_check_register;
1124 chip->recalc_addr = pca953x_recalc_addr;
1125 chip->check_reg = pca953x_check_register;
1128 chip->regmap = devm_regmap_init_i2c(client, regmap_config);
1129 if (IS_ERR(chip->regmap)) {
1130 ret = PTR_ERR(chip->regmap);
1134 regcache_mark_dirty(chip->regmap);
1136 mutex_init(&chip->i2c_lock);
1138 * In case we have an i2c-mux controlled by a GPIO provided by an
1139 * expander using the same driver higher on the device tree, read the
1140 * i2c adapter nesting depth and use the retrieved value as lockdep
1141 * subclass for chip->i2c_lock.
1143 * REVISIT: This solution is not complete. It protects us from lockdep
1144 * false positives when the expander controlling the i2c-mux is on
1145 * a different level on the device tree, but not when it's on the same
1146 * level on a different branch (in which case the subclass number
1147 * would be the same).
1149 * TODO: Once a correct solution is developed, a similar fix should be
1150 * applied to all other i2c-controlled GPIO expanders (and potentially
1153 lockdep_set_subclass(&chip->i2c_lock,
1154 i2c_adapter_depth(client->adapter));
1156 /* initialize cached registers from their original values.
1157 * we can't share this chip with another i2c master.
1159 if (PCA_CHIP_TYPE(chip->driver_data) == PCA957X_TYPE) {
1160 chip->regs = &pca957x_regs;
1161 ret = device_pca957x_init(chip, invert);
1163 chip->regs = &pca953x_regs;
1164 ret = device_pca95xx_init(chip, invert);
1169 ret = pca953x_irq_setup(chip, irq_base);
1173 ret = devm_gpiochip_add_data(&client->dev, &chip->gpio_chip, chip);
1177 if (pdata && pdata->setup) {
1178 ret = pdata->setup(client, chip->gpio_chip.base,
1179 chip->gpio_chip.ngpio, pdata->context);
1181 dev_warn(&client->dev, "setup failed, %d\n", ret);
1187 regulator_disable(chip->regulator);
1191 static void pca953x_remove(struct i2c_client *client)
1193 struct pca953x_platform_data *pdata = dev_get_platdata(&client->dev);
1194 struct pca953x_chip *chip = i2c_get_clientdata(client);
1196 if (pdata && pdata->teardown) {
1197 pdata->teardown(client, chip->gpio_chip.base,
1198 chip->gpio_chip.ngpio, pdata->context);
1201 regulator_disable(chip->regulator);
1204 #ifdef CONFIG_PM_SLEEP
1205 static int pca953x_regcache_sync(struct device *dev)
1207 struct pca953x_chip *chip = dev_get_drvdata(dev);
1212 * The ordering between direction and output is important,
1213 * sync these registers first and only then sync the rest.
1215 regaddr = chip->recalc_addr(chip, chip->regs->direction, 0);
1216 ret = regcache_sync_region(chip->regmap, regaddr, regaddr + NBANK(chip) - 1);
1218 dev_err(dev, "Failed to sync GPIO dir registers: %d\n", ret);
1222 regaddr = chip->recalc_addr(chip, chip->regs->output, 0);
1223 ret = regcache_sync_region(chip->regmap, regaddr, regaddr + NBANK(chip) - 1);
1225 dev_err(dev, "Failed to sync GPIO out registers: %d\n", ret);
1229 #ifdef CONFIG_GPIO_PCA953X_IRQ
1230 if (chip->driver_data & PCA_PCAL) {
1231 regaddr = chip->recalc_addr(chip, PCAL953X_IN_LATCH, 0);
1232 ret = regcache_sync_region(chip->regmap, regaddr,
1233 regaddr + NBANK(chip) - 1);
1235 dev_err(dev, "Failed to sync INT latch registers: %d\n",
1240 regaddr = chip->recalc_addr(chip, PCAL953X_INT_MASK, 0);
1241 ret = regcache_sync_region(chip->regmap, regaddr,
1242 regaddr + NBANK(chip) - 1);
1244 dev_err(dev, "Failed to sync INT mask registers: %d\n",
1254 static int pca953x_suspend(struct device *dev)
1256 struct pca953x_chip *chip = dev_get_drvdata(dev);
1258 mutex_lock(&chip->i2c_lock);
1259 regcache_cache_only(chip->regmap, true);
1260 mutex_unlock(&chip->i2c_lock);
1262 if (atomic_read(&chip->wakeup_path))
1263 device_set_wakeup_path(dev);
1265 regulator_disable(chip->regulator);
1270 static int pca953x_resume(struct device *dev)
1272 struct pca953x_chip *chip = dev_get_drvdata(dev);
1275 if (!atomic_read(&chip->wakeup_path)) {
1276 ret = regulator_enable(chip->regulator);
1278 dev_err(dev, "Failed to enable regulator: %d\n", ret);
1283 mutex_lock(&chip->i2c_lock);
1284 regcache_cache_only(chip->regmap, false);
1285 regcache_mark_dirty(chip->regmap);
1286 ret = pca953x_regcache_sync(dev);
1288 mutex_unlock(&chip->i2c_lock);
1292 ret = regcache_sync(chip->regmap);
1293 mutex_unlock(&chip->i2c_lock);
1295 dev_err(dev, "Failed to restore register map: %d\n", ret);
1303 /* convenience to stop overlong match-table lines */
1304 #define OF_653X(__nrgpio, __int) ((void *)(__nrgpio | PCAL653X_TYPE | __int))
1305 #define OF_953X(__nrgpio, __int) (void *)(__nrgpio | PCA953X_TYPE | __int)
1306 #define OF_957X(__nrgpio, __int) (void *)(__nrgpio | PCA957X_TYPE | __int)
1308 static const struct of_device_id pca953x_dt_ids[] = {
1309 { .compatible = "nxp,pca6408", .data = OF_953X(8, PCA_INT), },
1310 { .compatible = "nxp,pca6416", .data = OF_953X(16, PCA_INT), },
1311 { .compatible = "nxp,pca9505", .data = OF_953X(40, PCA_INT), },
1312 { .compatible = "nxp,pca9506", .data = OF_953X(40, PCA_INT), },
1313 { .compatible = "nxp,pca9534", .data = OF_953X( 8, PCA_INT), },
1314 { .compatible = "nxp,pca9535", .data = OF_953X(16, PCA_INT), },
1315 { .compatible = "nxp,pca9536", .data = OF_953X( 4, 0), },
1316 { .compatible = "nxp,pca9537", .data = OF_953X( 4, PCA_INT), },
1317 { .compatible = "nxp,pca9538", .data = OF_953X( 8, PCA_INT), },
1318 { .compatible = "nxp,pca9539", .data = OF_953X(16, PCA_INT), },
1319 { .compatible = "nxp,pca9554", .data = OF_953X( 8, PCA_INT), },
1320 { .compatible = "nxp,pca9555", .data = OF_953X(16, PCA_INT), },
1321 { .compatible = "nxp,pca9556", .data = OF_953X( 8, 0), },
1322 { .compatible = "nxp,pca9557", .data = OF_953X( 8, 0), },
1323 { .compatible = "nxp,pca9574", .data = OF_957X( 8, PCA_INT), },
1324 { .compatible = "nxp,pca9575", .data = OF_957X(16, PCA_INT), },
1325 { .compatible = "nxp,pca9698", .data = OF_953X(40, 0), },
1327 { .compatible = "nxp,pcal6408", .data = OF_953X(8, PCA_LATCH_INT), },
1328 { .compatible = "nxp,pcal6416", .data = OF_953X(16, PCA_LATCH_INT), },
1329 { .compatible = "nxp,pcal6524", .data = OF_953X(24, PCA_LATCH_INT), },
1330 { .compatible = "nxp,pcal6534", .data = OF_653X(34, PCA_LATCH_INT), },
1331 { .compatible = "nxp,pcal9535", .data = OF_953X(16, PCA_LATCH_INT), },
1332 { .compatible = "nxp,pcal9554b", .data = OF_953X( 8, PCA_LATCH_INT), },
1333 { .compatible = "nxp,pcal9555a", .data = OF_953X(16, PCA_LATCH_INT), },
1335 { .compatible = "maxim,max7310", .data = OF_953X( 8, 0), },
1336 { .compatible = "maxim,max7312", .data = OF_953X(16, PCA_INT), },
1337 { .compatible = "maxim,max7313", .data = OF_953X(16, PCA_INT), },
1338 { .compatible = "maxim,max7315", .data = OF_953X( 8, PCA_INT), },
1339 { .compatible = "maxim,max7318", .data = OF_953X(16, PCA_INT), },
1341 { .compatible = "ti,pca6107", .data = OF_953X( 8, PCA_INT), },
1342 { .compatible = "ti,pca9536", .data = OF_953X( 4, 0), },
1343 { .compatible = "ti,tca6408", .data = OF_953X( 8, PCA_INT), },
1344 { .compatible = "ti,tca6416", .data = OF_953X(16, PCA_INT), },
1345 { .compatible = "ti,tca6424", .data = OF_953X(24, PCA_INT), },
1346 { .compatible = "ti,tca9538", .data = OF_953X( 8, PCA_INT), },
1347 { .compatible = "ti,tca9539", .data = OF_953X(16, PCA_INT), },
1349 { .compatible = "onnn,cat9554", .data = OF_953X( 8, PCA_INT), },
1350 { .compatible = "onnn,pca9654", .data = OF_953X( 8, PCA_INT), },
1351 { .compatible = "onnn,pca9655", .data = OF_953X(16, PCA_INT), },
1353 { .compatible = "exar,xra1202", .data = OF_953X( 8, 0), },
1357 MODULE_DEVICE_TABLE(of, pca953x_dt_ids);
1359 static SIMPLE_DEV_PM_OPS(pca953x_pm_ops, pca953x_suspend, pca953x_resume);
1361 static struct i2c_driver pca953x_driver = {
1364 .pm = &pca953x_pm_ops,
1365 .of_match_table = pca953x_dt_ids,
1366 .acpi_match_table = pca953x_acpi_ids,
1368 .probe = pca953x_probe,
1369 .remove = pca953x_remove,
1370 .id_table = pca953x_id,
1373 static int __init pca953x_init(void)
1375 return i2c_add_driver(&pca953x_driver);
1377 /* register after i2c postcore initcall and before
1378 * subsys initcalls that may rely on these GPIOs
1380 subsys_initcall(pca953x_init);
1382 static void __exit pca953x_exit(void)
1384 i2c_del_driver(&pca953x_driver);
1386 module_exit(pca953x_exit);
1388 MODULE_AUTHOR("eric miao <eric.miao@marvell.com>");
1389 MODULE_DESCRIPTION("GPIO expander driver for PCA953x");
1390 MODULE_LICENSE("GPL");