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/driver.h>
14 #include <linux/gpio/consumer.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/slab.h>
25 #include <asm/unaligned.h>
27 #define PCA953X_INPUT 0x00
28 #define PCA953X_OUTPUT 0x01
29 #define PCA953X_INVERT 0x02
30 #define PCA953X_DIRECTION 0x03
32 #define REG_ADDR_MASK GENMASK(5, 0)
33 #define REG_ADDR_EXT BIT(6)
34 #define REG_ADDR_AI BIT(7)
36 #define PCA957X_IN 0x00
37 #define PCA957X_INVRT 0x01
38 #define PCA957X_BKEN 0x02
39 #define PCA957X_PUPD 0x03
40 #define PCA957X_CFG 0x04
41 #define PCA957X_OUT 0x05
42 #define PCA957X_MSK 0x06
43 #define PCA957X_INTS 0x07
45 #define PCAL953X_OUT_STRENGTH 0x20
46 #define PCAL953X_IN_LATCH 0x22
47 #define PCAL953X_PULL_EN 0x23
48 #define PCAL953X_PULL_SEL 0x24
49 #define PCAL953X_INT_MASK 0x25
50 #define PCAL953X_INT_STAT 0x26
51 #define PCAL953X_OUT_CONF 0x27
53 #define PCAL6524_INT_EDGE 0x28
54 #define PCAL6524_INT_CLR 0x2a
55 #define PCAL6524_IN_STATUS 0x2b
56 #define PCAL6524_OUT_INDCONF 0x2c
57 #define PCAL6524_DEBOUNCE 0x2d
59 #define PCA_GPIO_MASK GENMASK(7, 0)
61 #define PCAL_GPIO_MASK GENMASK(4, 0)
62 #define PCAL_PINCTRL_MASK GENMASK(6, 5)
64 #define PCA_INT BIT(8)
65 #define PCA_PCAL BIT(9)
66 #define PCA_LATCH_INT (PCA_PCAL | PCA_INT)
67 #define PCA953X_TYPE BIT(12)
68 #define PCA957X_TYPE BIT(13)
69 #define PCAL653X_TYPE BIT(14)
70 #define PCA_TYPE_MASK GENMASK(15, 12)
72 #define PCA_CHIP_TYPE(x) ((x) & PCA_TYPE_MASK)
74 static const struct i2c_device_id pca953x_id[] = {
75 { "pca6408", 8 | PCA953X_TYPE | PCA_INT, },
76 { "pca6416", 16 | PCA953X_TYPE | PCA_INT, },
77 { "pca9505", 40 | PCA953X_TYPE | PCA_INT, },
78 { "pca9506", 40 | PCA953X_TYPE | PCA_INT, },
79 { "pca9534", 8 | PCA953X_TYPE | PCA_INT, },
80 { "pca9535", 16 | PCA953X_TYPE | PCA_INT, },
81 { "pca9536", 4 | PCA953X_TYPE, },
82 { "pca9537", 4 | PCA953X_TYPE | PCA_INT, },
83 { "pca9538", 8 | PCA953X_TYPE | PCA_INT, },
84 { "pca9539", 16 | PCA953X_TYPE | PCA_INT, },
85 { "pca9554", 8 | PCA953X_TYPE | PCA_INT, },
86 { "pca9555", 16 | PCA953X_TYPE | PCA_INT, },
87 { "pca9556", 8 | PCA953X_TYPE, },
88 { "pca9557", 8 | PCA953X_TYPE, },
89 { "pca9574", 8 | PCA957X_TYPE | PCA_INT, },
90 { "pca9575", 16 | PCA957X_TYPE | PCA_INT, },
91 { "pca9698", 40 | PCA953X_TYPE, },
93 { "pcal6408", 8 | PCA953X_TYPE | PCA_LATCH_INT, },
94 { "pcal6416", 16 | PCA953X_TYPE | PCA_LATCH_INT, },
95 { "pcal6524", 24 | PCA953X_TYPE | PCA_LATCH_INT, },
96 { "pcal6534", 34 | PCAL653X_TYPE | PCA_LATCH_INT, },
97 { "pcal9535", 16 | PCA953X_TYPE | PCA_LATCH_INT, },
98 { "pcal9554b", 8 | PCA953X_TYPE | PCA_LATCH_INT, },
99 { "pcal9555a", 16 | PCA953X_TYPE | PCA_LATCH_INT, },
101 { "max7310", 8 | PCA953X_TYPE, },
102 { "max7312", 16 | PCA953X_TYPE | PCA_INT, },
103 { "max7313", 16 | PCA953X_TYPE | PCA_INT, },
104 { "max7315", 8 | PCA953X_TYPE | PCA_INT, },
105 { "max7318", 16 | PCA953X_TYPE | PCA_INT, },
106 { "pca6107", 8 | PCA953X_TYPE | PCA_INT, },
107 { "tca6408", 8 | PCA953X_TYPE | PCA_INT, },
108 { "tca6416", 16 | PCA953X_TYPE | PCA_INT, },
109 { "tca6424", 24 | PCA953X_TYPE | PCA_INT, },
110 { "tca9539", 16 | PCA953X_TYPE | PCA_INT, },
111 { "tca9554", 8 | PCA953X_TYPE | PCA_INT, },
112 { "xra1202", 8 | PCA953X_TYPE },
115 MODULE_DEVICE_TABLE(i2c, pca953x_id);
117 #ifdef CONFIG_GPIO_PCA953X_IRQ
119 #include <linux/dmi.h>
121 static const struct acpi_gpio_params pca953x_irq_gpios = { 0, 0, true };
123 static const struct acpi_gpio_mapping pca953x_acpi_irq_gpios[] = {
124 { "irq-gpios", &pca953x_irq_gpios, 1, ACPI_GPIO_QUIRK_ABSOLUTE_NUMBER },
128 static int pca953x_acpi_get_irq(struct device *dev)
132 ret = devm_acpi_dev_add_driver_gpios(dev, pca953x_acpi_irq_gpios);
134 dev_warn(dev, "can't add GPIO ACPI mapping\n");
136 ret = acpi_dev_gpio_irq_get_by(ACPI_COMPANION(dev), "irq-gpios", 0);
140 dev_info(dev, "ACPI interrupt quirk (IRQ %d)\n", ret);
144 static const struct dmi_system_id pca953x_dmi_acpi_irq_info[] = {
147 * On Intel Galileo Gen 2 board the IRQ pin of one of
148 * the I²C GPIO expanders, which has GpioInt() resource,
149 * is provided as an absolute number instead of being
150 * relative. Since first controller (gpio-sch.c) and
151 * second (gpio-dwapb.c) are at the fixed bases, we may
152 * safely refer to the number in the global space to get
156 DMI_EXACT_MATCH(DMI_BOARD_NAME, "GalileoGen2"),
163 static const struct acpi_device_id pca953x_acpi_ids[] = {
164 { "INT3491", 16 | PCA953X_TYPE | PCA_LATCH_INT, },
167 MODULE_DEVICE_TABLE(acpi, pca953x_acpi_ids);
171 #define MAX_LINE (MAX_BANK * BANK_SZ)
173 #define NBANK(chip) DIV_ROUND_UP(chip->gpio_chip.ngpio, BANK_SZ)
175 struct pca953x_reg_config {
182 static const struct pca953x_reg_config pca953x_regs = {
183 .direction = PCA953X_DIRECTION,
184 .output = PCA953X_OUTPUT,
185 .input = PCA953X_INPUT,
186 .invert = PCA953X_INVERT,
189 static const struct pca953x_reg_config pca957x_regs = {
190 .direction = PCA957X_CFG,
191 .output = PCA957X_OUT,
193 .invert = PCA957X_INVRT,
196 struct pca953x_chip {
198 struct mutex i2c_lock;
199 struct regmap *regmap;
201 #ifdef CONFIG_GPIO_PCA953X_IRQ
202 struct mutex irq_lock;
203 DECLARE_BITMAP(irq_mask, MAX_LINE);
204 DECLARE_BITMAP(irq_stat, MAX_LINE);
205 DECLARE_BITMAP(irq_trig_raise, MAX_LINE);
206 DECLARE_BITMAP(irq_trig_fall, MAX_LINE);
208 atomic_t wakeup_path;
210 struct i2c_client *client;
211 struct gpio_chip gpio_chip;
212 const char *const *names;
213 unsigned long driver_data;
214 struct regulator *regulator;
216 const struct pca953x_reg_config *regs;
218 u8 (*recalc_addr)(struct pca953x_chip *chip, int reg, int off);
219 bool (*check_reg)(struct pca953x_chip *chip, unsigned int reg,
223 static int pca953x_bank_shift(struct pca953x_chip *chip)
225 return fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
228 #define PCA953x_BANK_INPUT BIT(0)
229 #define PCA953x_BANK_OUTPUT BIT(1)
230 #define PCA953x_BANK_POLARITY BIT(2)
231 #define PCA953x_BANK_CONFIG BIT(3)
233 #define PCA957x_BANK_INPUT BIT(0)
234 #define PCA957x_BANK_POLARITY BIT(1)
235 #define PCA957x_BANK_BUSHOLD BIT(2)
236 #define PCA957x_BANK_CONFIG BIT(4)
237 #define PCA957x_BANK_OUTPUT BIT(5)
239 #define PCAL9xxx_BANK_IN_LATCH BIT(8 + 2)
240 #define PCAL9xxx_BANK_PULL_EN BIT(8 + 3)
241 #define PCAL9xxx_BANK_PULL_SEL BIT(8 + 4)
242 #define PCAL9xxx_BANK_IRQ_MASK BIT(8 + 5)
243 #define PCAL9xxx_BANK_IRQ_STAT BIT(8 + 6)
246 * We care about the following registers:
247 * - Standard set, below 0x40, each port can be replicated up to 8 times
249 * Input port 0x00 + 0 * bank_size R
250 * Output port 0x00 + 1 * bank_size RW
251 * Polarity Inversion port 0x00 + 2 * bank_size RW
252 * Configuration port 0x00 + 3 * bank_size RW
253 * - PCA957x with mixed up registers
254 * Input port 0x00 + 0 * bank_size R
255 * Polarity Inversion port 0x00 + 1 * bank_size RW
256 * Bus hold port 0x00 + 2 * bank_size RW
257 * Configuration port 0x00 + 4 * bank_size RW
258 * Output port 0x00 + 5 * bank_size RW
260 * - Extended set, above 0x40, often chip specific.
261 * - PCAL6524/PCAL9555A with custom PCAL IRQ handling:
262 * Input latch register 0x40 + 2 * bank_size RW
263 * Pull-up/pull-down enable reg 0x40 + 3 * bank_size RW
264 * Pull-up/pull-down select reg 0x40 + 4 * bank_size RW
265 * Interrupt mask register 0x40 + 5 * bank_size RW
266 * Interrupt status register 0x40 + 6 * bank_size R
268 * - Registers with bit 0x80 set, the AI bit
269 * The bit is cleared and the registers fall into one of the
273 static bool pca953x_check_register(struct pca953x_chip *chip, unsigned int reg,
276 int bank_shift = pca953x_bank_shift(chip);
277 int bank = (reg & REG_ADDR_MASK) >> bank_shift;
278 int offset = reg & (BIT(bank_shift) - 1);
280 /* Special PCAL extended register check. */
281 if (reg & REG_ADDR_EXT) {
282 if (!(chip->driver_data & PCA_PCAL))
287 /* Register is not in the matching bank. */
288 if (!(BIT(bank) & checkbank))
291 /* Register is not within allowed range of bank. */
292 if (offset >= NBANK(chip))
299 * Unfortunately, whilst the PCAL6534 chip (and compatibles) broadly follow the
300 * same register layout as the PCAL6524, the spacing of the registers has been
301 * fundamentally altered by compacting them and thus does not obey the same
302 * rules, including being able to use bit shifting to determine bank. These
303 * chips hence need special handling here.
305 static bool pcal6534_check_register(struct pca953x_chip *chip, unsigned int reg,
313 * Reserved block between 14h and 2Fh does not align on
314 * expected bank boundaries like other devices.
316 int temp = reg - 0x30;
318 bank = temp / NBANK(chip);
319 offset = temp - (bank * NBANK(chip));
321 } else if (reg >= 0x54) {
323 * Handle lack of reserved registers after output port
324 * configuration register to form a bank.
326 int temp = reg - 0x54;
328 bank = temp / NBANK(chip);
329 offset = temp - (bank * NBANK(chip));
332 bank = reg / NBANK(chip);
333 offset = reg - (bank * NBANK(chip));
336 /* Register is not in the matching bank. */
337 if (!(BIT(bank) & checkbank))
340 /* Register is not within allowed range of bank. */
341 if (offset >= NBANK(chip))
347 static bool pca953x_readable_register(struct device *dev, unsigned int reg)
349 struct pca953x_chip *chip = dev_get_drvdata(dev);
352 if (PCA_CHIP_TYPE(chip->driver_data) == PCA957X_TYPE) {
353 bank = PCA957x_BANK_INPUT | PCA957x_BANK_OUTPUT |
354 PCA957x_BANK_POLARITY | PCA957x_BANK_CONFIG |
355 PCA957x_BANK_BUSHOLD;
357 bank = PCA953x_BANK_INPUT | PCA953x_BANK_OUTPUT |
358 PCA953x_BANK_POLARITY | PCA953x_BANK_CONFIG;
361 if (chip->driver_data & PCA_PCAL) {
362 bank |= PCAL9xxx_BANK_IN_LATCH | PCAL9xxx_BANK_PULL_EN |
363 PCAL9xxx_BANK_PULL_SEL | PCAL9xxx_BANK_IRQ_MASK |
364 PCAL9xxx_BANK_IRQ_STAT;
367 return chip->check_reg(chip, reg, bank);
370 static bool pca953x_writeable_register(struct device *dev, unsigned int reg)
372 struct pca953x_chip *chip = dev_get_drvdata(dev);
375 if (PCA_CHIP_TYPE(chip->driver_data) == PCA957X_TYPE) {
376 bank = PCA957x_BANK_OUTPUT | PCA957x_BANK_POLARITY |
377 PCA957x_BANK_CONFIG | PCA957x_BANK_BUSHOLD;
379 bank = PCA953x_BANK_OUTPUT | PCA953x_BANK_POLARITY |
383 if (chip->driver_data & PCA_PCAL)
384 bank |= PCAL9xxx_BANK_IN_LATCH | PCAL9xxx_BANK_PULL_EN |
385 PCAL9xxx_BANK_PULL_SEL | PCAL9xxx_BANK_IRQ_MASK;
387 return chip->check_reg(chip, reg, bank);
390 static bool pca953x_volatile_register(struct device *dev, unsigned int reg)
392 struct pca953x_chip *chip = dev_get_drvdata(dev);
395 if (PCA_CHIP_TYPE(chip->driver_data) == PCA957X_TYPE)
396 bank = PCA957x_BANK_INPUT;
398 bank = PCA953x_BANK_INPUT;
400 if (chip->driver_data & PCA_PCAL)
401 bank |= PCAL9xxx_BANK_IRQ_STAT;
403 return chip->check_reg(chip, reg, bank);
406 static const struct regmap_config pca953x_i2c_regmap = {
410 .use_single_read = true,
411 .use_single_write = true,
413 .readable_reg = pca953x_readable_register,
414 .writeable_reg = pca953x_writeable_register,
415 .volatile_reg = pca953x_volatile_register,
417 .disable_locking = true,
418 .cache_type = REGCACHE_RBTREE,
419 .max_register = 0x7f,
422 static const struct regmap_config pca953x_ai_i2c_regmap = {
426 .read_flag_mask = REG_ADDR_AI,
427 .write_flag_mask = REG_ADDR_AI,
429 .readable_reg = pca953x_readable_register,
430 .writeable_reg = pca953x_writeable_register,
431 .volatile_reg = pca953x_volatile_register,
433 .disable_locking = true,
434 .cache_type = REGCACHE_RBTREE,
435 .max_register = 0x7f,
438 static u8 pca953x_recalc_addr(struct pca953x_chip *chip, int reg, int off)
440 int bank_shift = pca953x_bank_shift(chip);
441 int addr = (reg & PCAL_GPIO_MASK) << bank_shift;
442 int pinctrl = (reg & PCAL_PINCTRL_MASK) << 1;
443 u8 regaddr = pinctrl | addr | (off / BANK_SZ);
449 * The PCAL6534 and compatible chips have altered bank alignment that doesn't
450 * fit within the bit shifting scheme used for other devices.
452 static u8 pcal6534_recalc_addr(struct pca953x_chip *chip, int reg, int off)
457 addr = (reg & PCAL_GPIO_MASK) * NBANK(chip);
460 case PCAL953X_OUT_STRENGTH:
461 case PCAL953X_IN_LATCH:
462 case PCAL953X_PULL_EN:
463 case PCAL953X_PULL_SEL:
464 case PCAL953X_INT_MASK:
465 case PCAL953X_INT_STAT:
466 case PCAL953X_OUT_CONF:
467 pinctrl = ((reg & PCAL_PINCTRL_MASK) >> 1) + 0x20;
469 case PCAL6524_INT_EDGE:
470 case PCAL6524_INT_CLR:
471 case PCAL6524_IN_STATUS:
472 case PCAL6524_OUT_INDCONF:
473 case PCAL6524_DEBOUNCE:
474 pinctrl = ((reg & PCAL_PINCTRL_MASK) >> 1) + 0x1c;
478 return pinctrl + addr + (off / BANK_SZ);
481 static int pca953x_write_regs(struct pca953x_chip *chip, int reg, unsigned long *val)
483 u8 regaddr = chip->recalc_addr(chip, reg, 0);
487 for (i = 0; i < NBANK(chip); i++)
488 value[i] = bitmap_get_value8(val, i * BANK_SZ);
490 ret = regmap_bulk_write(chip->regmap, regaddr, value, NBANK(chip));
492 dev_err(&chip->client->dev, "failed writing register\n");
499 static int pca953x_read_regs(struct pca953x_chip *chip, int reg, unsigned long *val)
501 u8 regaddr = chip->recalc_addr(chip, reg, 0);
505 ret = regmap_bulk_read(chip->regmap, regaddr, value, NBANK(chip));
507 dev_err(&chip->client->dev, "failed reading register\n");
511 for (i = 0; i < NBANK(chip); i++)
512 bitmap_set_value8(val, value[i], i * BANK_SZ);
517 static int pca953x_gpio_direction_input(struct gpio_chip *gc, unsigned off)
519 struct pca953x_chip *chip = gpiochip_get_data(gc);
520 u8 dirreg = chip->recalc_addr(chip, chip->regs->direction, off);
521 u8 bit = BIT(off % BANK_SZ);
524 mutex_lock(&chip->i2c_lock);
525 ret = regmap_write_bits(chip->regmap, dirreg, bit, bit);
526 mutex_unlock(&chip->i2c_lock);
530 static int pca953x_gpio_direction_output(struct gpio_chip *gc,
531 unsigned off, int val)
533 struct pca953x_chip *chip = gpiochip_get_data(gc);
534 u8 dirreg = chip->recalc_addr(chip, chip->regs->direction, off);
535 u8 outreg = chip->recalc_addr(chip, chip->regs->output, off);
536 u8 bit = BIT(off % BANK_SZ);
539 mutex_lock(&chip->i2c_lock);
540 /* set output level */
541 ret = regmap_write_bits(chip->regmap, outreg, bit, val ? bit : 0);
546 ret = regmap_write_bits(chip->regmap, dirreg, bit, 0);
548 mutex_unlock(&chip->i2c_lock);
552 static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off)
554 struct pca953x_chip *chip = gpiochip_get_data(gc);
555 u8 inreg = chip->recalc_addr(chip, chip->regs->input, off);
556 u8 bit = BIT(off % BANK_SZ);
560 mutex_lock(&chip->i2c_lock);
561 ret = regmap_read(chip->regmap, inreg, ®_val);
562 mutex_unlock(&chip->i2c_lock);
566 return !!(reg_val & bit);
569 static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val)
571 struct pca953x_chip *chip = gpiochip_get_data(gc);
572 u8 outreg = chip->recalc_addr(chip, chip->regs->output, off);
573 u8 bit = BIT(off % BANK_SZ);
575 mutex_lock(&chip->i2c_lock);
576 regmap_write_bits(chip->regmap, outreg, bit, val ? bit : 0);
577 mutex_unlock(&chip->i2c_lock);
580 static int pca953x_gpio_get_direction(struct gpio_chip *gc, unsigned off)
582 struct pca953x_chip *chip = gpiochip_get_data(gc);
583 u8 dirreg = chip->recalc_addr(chip, chip->regs->direction, off);
584 u8 bit = BIT(off % BANK_SZ);
588 mutex_lock(&chip->i2c_lock);
589 ret = regmap_read(chip->regmap, dirreg, ®_val);
590 mutex_unlock(&chip->i2c_lock);
595 return GPIO_LINE_DIRECTION_IN;
597 return GPIO_LINE_DIRECTION_OUT;
600 static int pca953x_gpio_get_multiple(struct gpio_chip *gc,
601 unsigned long *mask, unsigned long *bits)
603 struct pca953x_chip *chip = gpiochip_get_data(gc);
604 DECLARE_BITMAP(reg_val, MAX_LINE);
607 mutex_lock(&chip->i2c_lock);
608 ret = pca953x_read_regs(chip, chip->regs->input, reg_val);
609 mutex_unlock(&chip->i2c_lock);
613 bitmap_replace(bits, bits, reg_val, mask, gc->ngpio);
617 static void pca953x_gpio_set_multiple(struct gpio_chip *gc,
618 unsigned long *mask, unsigned long *bits)
620 struct pca953x_chip *chip = gpiochip_get_data(gc);
621 DECLARE_BITMAP(reg_val, MAX_LINE);
624 mutex_lock(&chip->i2c_lock);
625 ret = pca953x_read_regs(chip, chip->regs->output, reg_val);
629 bitmap_replace(reg_val, reg_val, bits, mask, gc->ngpio);
631 pca953x_write_regs(chip, chip->regs->output, reg_val);
633 mutex_unlock(&chip->i2c_lock);
636 static int pca953x_gpio_set_pull_up_down(struct pca953x_chip *chip,
638 unsigned long config)
640 enum pin_config_param param = pinconf_to_config_param(config);
642 u8 pull_en_reg = chip->recalc_addr(chip, PCAL953X_PULL_EN, offset);
643 u8 pull_sel_reg = chip->recalc_addr(chip, PCAL953X_PULL_SEL, offset);
644 u8 bit = BIT(offset % BANK_SZ);
648 * pull-up/pull-down configuration requires PCAL extended
651 if (!(chip->driver_data & PCA_PCAL))
654 mutex_lock(&chip->i2c_lock);
656 /* Configure pull-up/pull-down */
657 if (param == PIN_CONFIG_BIAS_PULL_UP)
658 ret = regmap_write_bits(chip->regmap, pull_sel_reg, bit, bit);
659 else if (param == PIN_CONFIG_BIAS_PULL_DOWN)
660 ret = regmap_write_bits(chip->regmap, pull_sel_reg, bit, 0);
666 /* Disable/Enable pull-up/pull-down */
667 if (param == PIN_CONFIG_BIAS_DISABLE)
668 ret = regmap_write_bits(chip->regmap, pull_en_reg, bit, 0);
670 ret = regmap_write_bits(chip->regmap, pull_en_reg, bit, bit);
673 mutex_unlock(&chip->i2c_lock);
677 static int pca953x_gpio_set_config(struct gpio_chip *gc, unsigned int offset,
678 unsigned long config)
680 struct pca953x_chip *chip = gpiochip_get_data(gc);
682 switch (pinconf_to_config_param(config)) {
683 case PIN_CONFIG_BIAS_PULL_UP:
684 case PIN_CONFIG_BIAS_PULL_PIN_DEFAULT:
685 case PIN_CONFIG_BIAS_PULL_DOWN:
686 case PIN_CONFIG_BIAS_DISABLE:
687 return pca953x_gpio_set_pull_up_down(chip, offset, config);
693 static void pca953x_setup_gpio(struct pca953x_chip *chip, int gpios)
695 struct gpio_chip *gc;
697 gc = &chip->gpio_chip;
699 gc->direction_input = pca953x_gpio_direction_input;
700 gc->direction_output = pca953x_gpio_direction_output;
701 gc->get = pca953x_gpio_get_value;
702 gc->set = pca953x_gpio_set_value;
703 gc->get_direction = pca953x_gpio_get_direction;
704 gc->get_multiple = pca953x_gpio_get_multiple;
705 gc->set_multiple = pca953x_gpio_set_multiple;
706 gc->set_config = pca953x_gpio_set_config;
707 gc->can_sleep = true;
709 gc->base = chip->gpio_start;
711 gc->label = dev_name(&chip->client->dev);
712 gc->parent = &chip->client->dev;
713 gc->owner = THIS_MODULE;
714 gc->names = chip->names;
717 #ifdef CONFIG_GPIO_PCA953X_IRQ
718 static void pca953x_irq_mask(struct irq_data *d)
720 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
721 struct pca953x_chip *chip = gpiochip_get_data(gc);
722 irq_hw_number_t hwirq = irqd_to_hwirq(d);
724 clear_bit(hwirq, chip->irq_mask);
725 gpiochip_disable_irq(gc, hwirq);
728 static void pca953x_irq_unmask(struct irq_data *d)
730 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
731 struct pca953x_chip *chip = gpiochip_get_data(gc);
732 irq_hw_number_t hwirq = irqd_to_hwirq(d);
734 gpiochip_enable_irq(gc, hwirq);
735 set_bit(hwirq, chip->irq_mask);
738 static int pca953x_irq_set_wake(struct irq_data *d, unsigned int on)
740 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
741 struct pca953x_chip *chip = gpiochip_get_data(gc);
744 atomic_inc(&chip->wakeup_path);
746 atomic_dec(&chip->wakeup_path);
748 return irq_set_irq_wake(chip->client->irq, on);
751 static void pca953x_irq_bus_lock(struct irq_data *d)
753 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
754 struct pca953x_chip *chip = gpiochip_get_data(gc);
756 mutex_lock(&chip->irq_lock);
759 static void pca953x_irq_bus_sync_unlock(struct irq_data *d)
761 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
762 struct pca953x_chip *chip = gpiochip_get_data(gc);
763 DECLARE_BITMAP(irq_mask, MAX_LINE);
764 DECLARE_BITMAP(reg_direction, MAX_LINE);
767 if (chip->driver_data & PCA_PCAL) {
768 /* Enable latch on interrupt-enabled inputs */
769 pca953x_write_regs(chip, PCAL953X_IN_LATCH, chip->irq_mask);
771 bitmap_complement(irq_mask, chip->irq_mask, gc->ngpio);
773 /* Unmask enabled interrupts */
774 pca953x_write_regs(chip, PCAL953X_INT_MASK, irq_mask);
777 /* Switch direction to input if needed */
778 pca953x_read_regs(chip, chip->regs->direction, reg_direction);
780 bitmap_or(irq_mask, chip->irq_trig_fall, chip->irq_trig_raise, gc->ngpio);
781 bitmap_complement(reg_direction, reg_direction, gc->ngpio);
782 bitmap_and(irq_mask, irq_mask, reg_direction, gc->ngpio);
784 /* Look for any newly setup interrupt */
785 for_each_set_bit(level, irq_mask, gc->ngpio)
786 pca953x_gpio_direction_input(&chip->gpio_chip, level);
788 mutex_unlock(&chip->irq_lock);
791 static int pca953x_irq_set_type(struct irq_data *d, unsigned int type)
793 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
794 struct pca953x_chip *chip = gpiochip_get_data(gc);
795 irq_hw_number_t hwirq = irqd_to_hwirq(d);
797 if (!(type & IRQ_TYPE_EDGE_BOTH)) {
798 dev_err(&chip->client->dev, "irq %d: unsupported type %d\n",
803 assign_bit(hwirq, chip->irq_trig_fall, type & IRQ_TYPE_EDGE_FALLING);
804 assign_bit(hwirq, chip->irq_trig_raise, type & IRQ_TYPE_EDGE_RISING);
809 static void pca953x_irq_shutdown(struct irq_data *d)
811 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
812 struct pca953x_chip *chip = gpiochip_get_data(gc);
813 irq_hw_number_t hwirq = irqd_to_hwirq(d);
815 clear_bit(hwirq, chip->irq_trig_raise);
816 clear_bit(hwirq, chip->irq_trig_fall);
819 static void pca953x_irq_print_chip(struct irq_data *data, struct seq_file *p)
821 struct gpio_chip *gc = irq_data_get_irq_chip_data(data);
823 seq_printf(p, dev_name(gc->parent));
826 static const struct irq_chip pca953x_irq_chip = {
827 .irq_mask = pca953x_irq_mask,
828 .irq_unmask = pca953x_irq_unmask,
829 .irq_set_wake = pca953x_irq_set_wake,
830 .irq_bus_lock = pca953x_irq_bus_lock,
831 .irq_bus_sync_unlock = pca953x_irq_bus_sync_unlock,
832 .irq_set_type = pca953x_irq_set_type,
833 .irq_shutdown = pca953x_irq_shutdown,
834 .irq_print_chip = pca953x_irq_print_chip,
835 .flags = IRQCHIP_IMMUTABLE,
836 GPIOCHIP_IRQ_RESOURCE_HELPERS,
839 static bool pca953x_irq_pending(struct pca953x_chip *chip, unsigned long *pending)
841 struct gpio_chip *gc = &chip->gpio_chip;
842 DECLARE_BITMAP(reg_direction, MAX_LINE);
843 DECLARE_BITMAP(old_stat, MAX_LINE);
844 DECLARE_BITMAP(cur_stat, MAX_LINE);
845 DECLARE_BITMAP(new_stat, MAX_LINE);
846 DECLARE_BITMAP(trigger, MAX_LINE);
849 if (chip->driver_data & PCA_PCAL) {
850 /* Read the current interrupt status from the device */
851 ret = pca953x_read_regs(chip, PCAL953X_INT_STAT, trigger);
855 /* Check latched inputs and clear interrupt status */
856 ret = pca953x_read_regs(chip, chip->regs->input, cur_stat);
860 /* Apply filter for rising/falling edge selection */
861 bitmap_replace(new_stat, chip->irq_trig_fall, chip->irq_trig_raise, cur_stat, gc->ngpio);
863 bitmap_and(pending, new_stat, trigger, gc->ngpio);
865 return !bitmap_empty(pending, gc->ngpio);
868 ret = pca953x_read_regs(chip, chip->regs->input, cur_stat);
872 /* Remove output pins from the equation */
873 pca953x_read_regs(chip, chip->regs->direction, reg_direction);
875 bitmap_copy(old_stat, chip->irq_stat, gc->ngpio);
877 bitmap_and(new_stat, cur_stat, reg_direction, gc->ngpio);
878 bitmap_xor(cur_stat, new_stat, old_stat, gc->ngpio);
879 bitmap_and(trigger, cur_stat, chip->irq_mask, gc->ngpio);
881 bitmap_copy(chip->irq_stat, new_stat, gc->ngpio);
883 if (bitmap_empty(trigger, gc->ngpio))
886 bitmap_and(cur_stat, chip->irq_trig_fall, old_stat, gc->ngpio);
887 bitmap_and(old_stat, chip->irq_trig_raise, new_stat, gc->ngpio);
888 bitmap_or(new_stat, old_stat, cur_stat, gc->ngpio);
889 bitmap_and(pending, new_stat, trigger, gc->ngpio);
891 return !bitmap_empty(pending, gc->ngpio);
894 static irqreturn_t pca953x_irq_handler(int irq, void *devid)
896 struct pca953x_chip *chip = devid;
897 struct gpio_chip *gc = &chip->gpio_chip;
898 DECLARE_BITMAP(pending, MAX_LINE);
902 bitmap_zero(pending, MAX_LINE);
904 mutex_lock(&chip->i2c_lock);
905 ret = pca953x_irq_pending(chip, pending);
906 mutex_unlock(&chip->i2c_lock);
911 for_each_set_bit(level, pending, gc->ngpio) {
912 int nested_irq = irq_find_mapping(gc->irq.domain, level);
914 if (unlikely(nested_irq <= 0)) {
915 dev_warn_ratelimited(gc->parent, "unmapped interrupt %d\n", level);
919 handle_nested_irq(nested_irq);
924 return IRQ_RETVAL(ret);
927 static int pca953x_irq_setup(struct pca953x_chip *chip, int irq_base)
929 struct i2c_client *client = chip->client;
930 DECLARE_BITMAP(reg_direction, MAX_LINE);
931 DECLARE_BITMAP(irq_stat, MAX_LINE);
932 struct gpio_irq_chip *girq;
935 if (dmi_first_match(pca953x_dmi_acpi_irq_info)) {
936 ret = pca953x_acpi_get_irq(&client->dev);
947 if (!(chip->driver_data & PCA_INT))
950 ret = pca953x_read_regs(chip, chip->regs->input, irq_stat);
955 * There is no way to know which GPIO line generated the
956 * interrupt. We have to rely on the previous read for
959 pca953x_read_regs(chip, chip->regs->direction, reg_direction);
960 bitmap_and(chip->irq_stat, irq_stat, reg_direction, chip->gpio_chip.ngpio);
961 mutex_init(&chip->irq_lock);
963 girq = &chip->gpio_chip.irq;
964 gpio_irq_chip_set_chip(girq, &pca953x_irq_chip);
965 /* This will let us handle the parent IRQ in the driver */
966 girq->parent_handler = NULL;
967 girq->num_parents = 0;
968 girq->parents = NULL;
969 girq->default_type = IRQ_TYPE_NONE;
970 girq->handler = handle_simple_irq;
971 girq->threaded = true;
972 girq->first = irq_base; /* FIXME: get rid of this */
974 ret = devm_request_threaded_irq(&client->dev, client->irq,
975 NULL, pca953x_irq_handler,
976 IRQF_ONESHOT | IRQF_SHARED,
977 dev_name(&client->dev), chip);
979 dev_err(&client->dev, "failed to request irq %d\n",
987 #else /* CONFIG_GPIO_PCA953X_IRQ */
988 static int pca953x_irq_setup(struct pca953x_chip *chip,
991 struct i2c_client *client = chip->client;
993 if (client->irq && irq_base != -1 && (chip->driver_data & PCA_INT))
994 dev_warn(&client->dev, "interrupt support not compiled in\n");
1000 static int device_pca95xx_init(struct pca953x_chip *chip, u32 invert)
1002 DECLARE_BITMAP(val, MAX_LINE);
1006 regaddr = chip->recalc_addr(chip, chip->regs->output, 0);
1007 ret = regcache_sync_region(chip->regmap, regaddr,
1008 regaddr + NBANK(chip) - 1);
1012 regaddr = chip->recalc_addr(chip, chip->regs->direction, 0);
1013 ret = regcache_sync_region(chip->regmap, regaddr,
1014 regaddr + NBANK(chip) - 1);
1018 /* set platform specific polarity inversion */
1020 bitmap_fill(val, MAX_LINE);
1022 bitmap_zero(val, MAX_LINE);
1024 ret = pca953x_write_regs(chip, chip->regs->invert, val);
1029 static int device_pca957x_init(struct pca953x_chip *chip, u32 invert)
1031 DECLARE_BITMAP(val, MAX_LINE);
1035 ret = device_pca95xx_init(chip, invert);
1039 /* To enable register 6, 7 to control pull up and pull down */
1040 for (i = 0; i < NBANK(chip); i++)
1041 bitmap_set_value8(val, 0x02, i * BANK_SZ);
1043 ret = pca953x_write_regs(chip, PCA957X_BKEN, val);
1052 static int pca953x_probe(struct i2c_client *client,
1053 const struct i2c_device_id *i2c_id)
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;
1094 reg = devm_regulator_get(&client->dev, "vcc");
1096 return dev_err_probe(&client->dev, PTR_ERR(reg), "reg get err\n");
1098 ret = regulator_enable(reg);
1100 dev_err(&client->dev, "reg en err: %d\n", ret);
1103 chip->regulator = reg;
1106 chip->driver_data = i2c_id->driver_data;
1110 match = device_get_match_data(&client->dev);
1116 chip->driver_data = (uintptr_t)match;
1119 i2c_set_clientdata(client, chip);
1121 pca953x_setup_gpio(chip, chip->driver_data & PCA_GPIO_MASK);
1123 if (NBANK(chip) > 2 || PCA_CHIP_TYPE(chip->driver_data) == PCA957X_TYPE) {
1124 dev_info(&client->dev, "using AI\n");
1125 regmap_config = &pca953x_ai_i2c_regmap;
1127 dev_info(&client->dev, "using no AI\n");
1128 regmap_config = &pca953x_i2c_regmap;
1131 if (PCA_CHIP_TYPE(chip->driver_data) == PCAL653X_TYPE) {
1132 chip->recalc_addr = pcal6534_recalc_addr;
1133 chip->check_reg = pcal6534_check_register;
1135 chip->recalc_addr = pca953x_recalc_addr;
1136 chip->check_reg = pca953x_check_register;
1139 chip->regmap = devm_regmap_init_i2c(client, regmap_config);
1140 if (IS_ERR(chip->regmap)) {
1141 ret = PTR_ERR(chip->regmap);
1145 regcache_mark_dirty(chip->regmap);
1147 mutex_init(&chip->i2c_lock);
1149 * In case we have an i2c-mux controlled by a GPIO provided by an
1150 * expander using the same driver higher on the device tree, read the
1151 * i2c adapter nesting depth and use the retrieved value as lockdep
1152 * subclass for chip->i2c_lock.
1154 * REVISIT: This solution is not complete. It protects us from lockdep
1155 * false positives when the expander controlling the i2c-mux is on
1156 * a different level on the device tree, but not when it's on the same
1157 * level on a different branch (in which case the subclass number
1158 * would be the same).
1160 * TODO: Once a correct solution is developed, a similar fix should be
1161 * applied to all other i2c-controlled GPIO expanders (and potentially
1164 lockdep_set_subclass(&chip->i2c_lock,
1165 i2c_adapter_depth(client->adapter));
1167 /* initialize cached registers from their original values.
1168 * we can't share this chip with another i2c master.
1170 if (PCA_CHIP_TYPE(chip->driver_data) == PCA957X_TYPE) {
1171 chip->regs = &pca957x_regs;
1172 ret = device_pca957x_init(chip, invert);
1174 chip->regs = &pca953x_regs;
1175 ret = device_pca95xx_init(chip, invert);
1180 ret = pca953x_irq_setup(chip, irq_base);
1184 ret = devm_gpiochip_add_data(&client->dev, &chip->gpio_chip, chip);
1188 if (pdata && pdata->setup) {
1189 ret = pdata->setup(client, chip->gpio_chip.base,
1190 chip->gpio_chip.ngpio, pdata->context);
1192 dev_warn(&client->dev, "setup failed, %d\n", ret);
1198 regulator_disable(chip->regulator);
1202 static void pca953x_remove(struct i2c_client *client)
1204 struct pca953x_platform_data *pdata = dev_get_platdata(&client->dev);
1205 struct pca953x_chip *chip = i2c_get_clientdata(client);
1207 if (pdata && pdata->teardown) {
1208 pdata->teardown(client, chip->gpio_chip.base,
1209 chip->gpio_chip.ngpio, pdata->context);
1212 regulator_disable(chip->regulator);
1215 #ifdef CONFIG_PM_SLEEP
1216 static int pca953x_regcache_sync(struct device *dev)
1218 struct pca953x_chip *chip = dev_get_drvdata(dev);
1223 * The ordering between direction and output is important,
1224 * sync these registers first and only then sync the rest.
1226 regaddr = chip->recalc_addr(chip, chip->regs->direction, 0);
1227 ret = regcache_sync_region(chip->regmap, regaddr, regaddr + NBANK(chip) - 1);
1229 dev_err(dev, "Failed to sync GPIO dir registers: %d\n", ret);
1233 regaddr = chip->recalc_addr(chip, chip->regs->output, 0);
1234 ret = regcache_sync_region(chip->regmap, regaddr, regaddr + NBANK(chip) - 1);
1236 dev_err(dev, "Failed to sync GPIO out registers: %d\n", ret);
1240 #ifdef CONFIG_GPIO_PCA953X_IRQ
1241 if (chip->driver_data & PCA_PCAL) {
1242 regaddr = chip->recalc_addr(chip, PCAL953X_IN_LATCH, 0);
1243 ret = regcache_sync_region(chip->regmap, regaddr,
1244 regaddr + NBANK(chip) - 1);
1246 dev_err(dev, "Failed to sync INT latch registers: %d\n",
1251 regaddr = chip->recalc_addr(chip, PCAL953X_INT_MASK, 0);
1252 ret = regcache_sync_region(chip->regmap, regaddr,
1253 regaddr + NBANK(chip) - 1);
1255 dev_err(dev, "Failed to sync INT mask registers: %d\n",
1265 static int pca953x_suspend(struct device *dev)
1267 struct pca953x_chip *chip = dev_get_drvdata(dev);
1269 mutex_lock(&chip->i2c_lock);
1270 regcache_cache_only(chip->regmap, true);
1271 mutex_unlock(&chip->i2c_lock);
1273 if (atomic_read(&chip->wakeup_path))
1274 device_set_wakeup_path(dev);
1276 regulator_disable(chip->regulator);
1281 static int pca953x_resume(struct device *dev)
1283 struct pca953x_chip *chip = dev_get_drvdata(dev);
1286 if (!atomic_read(&chip->wakeup_path)) {
1287 ret = regulator_enable(chip->regulator);
1289 dev_err(dev, "Failed to enable regulator: %d\n", ret);
1294 mutex_lock(&chip->i2c_lock);
1295 regcache_cache_only(chip->regmap, false);
1296 regcache_mark_dirty(chip->regmap);
1297 ret = pca953x_regcache_sync(dev);
1299 mutex_unlock(&chip->i2c_lock);
1303 ret = regcache_sync(chip->regmap);
1304 mutex_unlock(&chip->i2c_lock);
1306 dev_err(dev, "Failed to restore register map: %d\n", ret);
1314 /* convenience to stop overlong match-table lines */
1315 #define OF_653X(__nrgpio, __int) ((void *)(__nrgpio | PCAL653X_TYPE | __int))
1316 #define OF_953X(__nrgpio, __int) (void *)(__nrgpio | PCA953X_TYPE | __int)
1317 #define OF_957X(__nrgpio, __int) (void *)(__nrgpio | PCA957X_TYPE | __int)
1319 static const struct of_device_id pca953x_dt_ids[] = {
1320 { .compatible = "nxp,pca6408", .data = OF_953X(8, PCA_INT), },
1321 { .compatible = "nxp,pca6416", .data = OF_953X(16, PCA_INT), },
1322 { .compatible = "nxp,pca9505", .data = OF_953X(40, PCA_INT), },
1323 { .compatible = "nxp,pca9506", .data = OF_953X(40, PCA_INT), },
1324 { .compatible = "nxp,pca9534", .data = OF_953X( 8, PCA_INT), },
1325 { .compatible = "nxp,pca9535", .data = OF_953X(16, PCA_INT), },
1326 { .compatible = "nxp,pca9536", .data = OF_953X( 4, 0), },
1327 { .compatible = "nxp,pca9537", .data = OF_953X( 4, PCA_INT), },
1328 { .compatible = "nxp,pca9538", .data = OF_953X( 8, PCA_INT), },
1329 { .compatible = "nxp,pca9539", .data = OF_953X(16, PCA_INT), },
1330 { .compatible = "nxp,pca9554", .data = OF_953X( 8, PCA_INT), },
1331 { .compatible = "nxp,pca9555", .data = OF_953X(16, PCA_INT), },
1332 { .compatible = "nxp,pca9556", .data = OF_953X( 8, 0), },
1333 { .compatible = "nxp,pca9557", .data = OF_953X( 8, 0), },
1334 { .compatible = "nxp,pca9574", .data = OF_957X( 8, PCA_INT), },
1335 { .compatible = "nxp,pca9575", .data = OF_957X(16, PCA_INT), },
1336 { .compatible = "nxp,pca9698", .data = OF_953X(40, 0), },
1338 { .compatible = "nxp,pcal6408", .data = OF_953X(8, PCA_LATCH_INT), },
1339 { .compatible = "nxp,pcal6416", .data = OF_953X(16, PCA_LATCH_INT), },
1340 { .compatible = "nxp,pcal6524", .data = OF_953X(24, PCA_LATCH_INT), },
1341 { .compatible = "nxp,pcal6534", .data = OF_653X(34, PCA_LATCH_INT), },
1342 { .compatible = "nxp,pcal9535", .data = OF_953X(16, PCA_LATCH_INT), },
1343 { .compatible = "nxp,pcal9554b", .data = OF_953X( 8, PCA_LATCH_INT), },
1344 { .compatible = "nxp,pcal9555a", .data = OF_953X(16, PCA_LATCH_INT), },
1346 { .compatible = "maxim,max7310", .data = OF_953X( 8, 0), },
1347 { .compatible = "maxim,max7312", .data = OF_953X(16, PCA_INT), },
1348 { .compatible = "maxim,max7313", .data = OF_953X(16, PCA_INT), },
1349 { .compatible = "maxim,max7315", .data = OF_953X( 8, PCA_INT), },
1350 { .compatible = "maxim,max7318", .data = OF_953X(16, PCA_INT), },
1352 { .compatible = "ti,pca6107", .data = OF_953X( 8, PCA_INT), },
1353 { .compatible = "ti,pca9536", .data = OF_953X( 4, 0), },
1354 { .compatible = "ti,tca6408", .data = OF_953X( 8, PCA_INT), },
1355 { .compatible = "ti,tca6416", .data = OF_953X(16, PCA_INT), },
1356 { .compatible = "ti,tca6424", .data = OF_953X(24, PCA_INT), },
1357 { .compatible = "ti,tca9539", .data = OF_953X(16, PCA_INT), },
1359 { .compatible = "onnn,cat9554", .data = OF_953X( 8, PCA_INT), },
1360 { .compatible = "onnn,pca9654", .data = OF_953X( 8, PCA_INT), },
1361 { .compatible = "onnn,pca9655", .data = OF_953X(16, PCA_INT), },
1363 { .compatible = "exar,xra1202", .data = OF_953X( 8, 0), },
1367 MODULE_DEVICE_TABLE(of, pca953x_dt_ids);
1369 static SIMPLE_DEV_PM_OPS(pca953x_pm_ops, pca953x_suspend, pca953x_resume);
1371 static struct i2c_driver pca953x_driver = {
1374 .pm = &pca953x_pm_ops,
1375 .of_match_table = pca953x_dt_ids,
1376 .acpi_match_table = pca953x_acpi_ids,
1378 .probe = pca953x_probe,
1379 .remove = pca953x_remove,
1380 .id_table = pca953x_id,
1383 static int __init pca953x_init(void)
1385 return i2c_add_driver(&pca953x_driver);
1387 /* register after i2c postcore initcall and before
1388 * subsys initcalls that may rely on these GPIOs
1390 subsys_initcall(pca953x_init);
1392 static void __exit pca953x_exit(void)
1394 i2c_del_driver(&pca953x_driver);
1396 module_exit(pca953x_exit);
1398 MODULE_AUTHOR("eric miao <eric.miao@marvell.com>");
1399 MODULE_DESCRIPTION("GPIO expander driver for PCA953x");
1400 MODULE_LICENSE("GPL");