2 * MCP23S08 SPI/I2C GPIO gpio expander driver
4 * The inputs and outputs of the mcp23s08, mcp23s17, mcp23008 and mcp23017 are
6 * For the I2C versions of the chips (mcp23008 and mcp23017) generation of
7 * interrupts is also supported.
8 * The hardware of the SPI versions of the chips (mcp23s08 and mcp23s17) is
9 * also capable of generating interrupts, but the linux driver does not
13 #include <linux/kernel.h>
14 #include <linux/device.h>
15 #include <linux/mutex.h>
16 #include <linux/module.h>
17 #include <linux/gpio.h>
18 #include <linux/i2c.h>
19 #include <linux/spi/spi.h>
20 #include <linux/spi/mcp23s08.h>
21 #include <linux/slab.h>
22 #include <asm/byteorder.h>
23 #include <linux/interrupt.h>
24 #include <linux/of_irq.h>
25 #include <linux/of_device.h>
28 * MCP types supported by driver
30 #define MCP_TYPE_S08 0
31 #define MCP_TYPE_S17 1
32 #define MCP_TYPE_008 2
33 #define MCP_TYPE_017 3
35 /* Registers are all 8 bits wide.
37 * The mcp23s17 has twice as many bits, and can be configured to work
38 * with either 16 bit registers or with two adjacent 8 bit banks.
40 #define MCP_IODIR 0x00 /* init/reset: all ones */
42 #define MCP_GPINTEN 0x02
43 #define MCP_DEFVAL 0x03
44 #define MCP_INTCON 0x04
45 #define MCP_IOCON 0x05
46 # define IOCON_MIRROR (1 << 6)
47 # define IOCON_SEQOP (1 << 5)
48 # define IOCON_HAEN (1 << 3)
49 # define IOCON_ODR (1 << 2)
50 # define IOCON_INTPOL (1 << 1)
53 #define MCP_INTCAP 0x08
60 int (*read)(struct mcp23s08 *mcp, unsigned reg);
61 int (*write)(struct mcp23s08 *mcp, unsigned reg, unsigned val);
62 int (*read_regs)(struct mcp23s08 *mcp, unsigned reg,
63 u16 *vals, unsigned n);
75 /* lock protects the cached values */
77 struct mutex irq_lock;
78 struct irq_domain *irq_domain;
80 struct gpio_chip chip;
82 const struct mcp23s08_ops *ops;
83 void *data; /* ops specific data */
86 /* A given spi_device can represent up to eight mcp23sxx chips
87 * sharing the same chipselect but using different addresses
88 * (e.g. chips #0 and #3 might be populated, but not #1 or $2).
89 * Driver data holds all the per-chip data.
91 struct mcp23s08_driver_data {
93 struct mcp23s08 *mcp[8];
94 struct mcp23s08 chip[];
97 /* This lock class tells lockdep that GPIO irqs are in a different
98 * category than their parents, so it won't report false recursion.
100 static struct lock_class_key gpio_lock_class;
102 /*----------------------------------------------------------------------*/
104 #if IS_ENABLED(CONFIG_I2C)
106 static int mcp23008_read(struct mcp23s08 *mcp, unsigned reg)
108 return i2c_smbus_read_byte_data(mcp->data, reg);
111 static int mcp23008_write(struct mcp23s08 *mcp, unsigned reg, unsigned val)
113 return i2c_smbus_write_byte_data(mcp->data, reg, val);
117 mcp23008_read_regs(struct mcp23s08 *mcp, unsigned reg, u16 *vals, unsigned n)
120 int ret = mcp23008_read(mcp, reg++);
129 static int mcp23017_read(struct mcp23s08 *mcp, unsigned reg)
131 return i2c_smbus_read_word_data(mcp->data, reg << 1);
134 static int mcp23017_write(struct mcp23s08 *mcp, unsigned reg, unsigned val)
136 return i2c_smbus_write_word_data(mcp->data, reg << 1, val);
140 mcp23017_read_regs(struct mcp23s08 *mcp, unsigned reg, u16 *vals, unsigned n)
143 int ret = mcp23017_read(mcp, reg++);
152 static const struct mcp23s08_ops mcp23008_ops = {
153 .read = mcp23008_read,
154 .write = mcp23008_write,
155 .read_regs = mcp23008_read_regs,
158 static const struct mcp23s08_ops mcp23017_ops = {
159 .read = mcp23017_read,
160 .write = mcp23017_write,
161 .read_regs = mcp23017_read_regs,
164 #endif /* CONFIG_I2C */
166 /*----------------------------------------------------------------------*/
168 #ifdef CONFIG_SPI_MASTER
170 static int mcp23s08_read(struct mcp23s08 *mcp, unsigned reg)
175 tx[0] = mcp->addr | 0x01;
177 status = spi_write_then_read(mcp->data, tx, sizeof(tx), rx, sizeof(rx));
178 return (status < 0) ? status : rx[0];
181 static int mcp23s08_write(struct mcp23s08 *mcp, unsigned reg, unsigned val)
188 return spi_write_then_read(mcp->data, tx, sizeof(tx), NULL, 0);
192 mcp23s08_read_regs(struct mcp23s08 *mcp, unsigned reg, u16 *vals, unsigned n)
197 if ((n + reg) > sizeof(mcp->cache))
199 tx[0] = mcp->addr | 0x01;
203 status = spi_write_then_read(mcp->data, tx, sizeof(tx), tmp, n);
206 vals[n] = tmp[n]; /* expand to 16bit */
211 static int mcp23s17_read(struct mcp23s08 *mcp, unsigned reg)
216 tx[0] = mcp->addr | 0x01;
218 status = spi_write_then_read(mcp->data, tx, sizeof(tx), rx, sizeof(rx));
219 return (status < 0) ? status : (rx[0] | (rx[1] << 8));
222 static int mcp23s17_write(struct mcp23s08 *mcp, unsigned reg, unsigned val)
230 return spi_write_then_read(mcp->data, tx, sizeof(tx), NULL, 0);
234 mcp23s17_read_regs(struct mcp23s08 *mcp, unsigned reg, u16 *vals, unsigned n)
239 if ((n + reg) > sizeof(mcp->cache))
241 tx[0] = mcp->addr | 0x01;
244 status = spi_write_then_read(mcp->data, tx, sizeof(tx),
248 vals[n] = __le16_to_cpu((__le16)vals[n]);
254 static const struct mcp23s08_ops mcp23s08_ops = {
255 .read = mcp23s08_read,
256 .write = mcp23s08_write,
257 .read_regs = mcp23s08_read_regs,
260 static const struct mcp23s08_ops mcp23s17_ops = {
261 .read = mcp23s17_read,
262 .write = mcp23s17_write,
263 .read_regs = mcp23s17_read_regs,
266 #endif /* CONFIG_SPI_MASTER */
268 /*----------------------------------------------------------------------*/
270 static int mcp23s08_direction_input(struct gpio_chip *chip, unsigned offset)
272 struct mcp23s08 *mcp = container_of(chip, struct mcp23s08, chip);
275 mutex_lock(&mcp->lock);
276 mcp->cache[MCP_IODIR] |= (1 << offset);
277 status = mcp->ops->write(mcp, MCP_IODIR, mcp->cache[MCP_IODIR]);
278 mutex_unlock(&mcp->lock);
282 static int mcp23s08_get(struct gpio_chip *chip, unsigned offset)
284 struct mcp23s08 *mcp = container_of(chip, struct mcp23s08, chip);
287 mutex_lock(&mcp->lock);
289 /* REVISIT reading this clears any IRQ ... */
290 status = mcp->ops->read(mcp, MCP_GPIO);
294 mcp->cache[MCP_GPIO] = status;
295 status = !!(status & (1 << offset));
297 mutex_unlock(&mcp->lock);
301 static int __mcp23s08_set(struct mcp23s08 *mcp, unsigned mask, int value)
303 unsigned olat = mcp->cache[MCP_OLAT];
309 mcp->cache[MCP_OLAT] = olat;
310 return mcp->ops->write(mcp, MCP_OLAT, olat);
313 static void mcp23s08_set(struct gpio_chip *chip, unsigned offset, int value)
315 struct mcp23s08 *mcp = container_of(chip, struct mcp23s08, chip);
316 unsigned mask = 1 << offset;
318 mutex_lock(&mcp->lock);
319 __mcp23s08_set(mcp, mask, value);
320 mutex_unlock(&mcp->lock);
324 mcp23s08_direction_output(struct gpio_chip *chip, unsigned offset, int value)
326 struct mcp23s08 *mcp = container_of(chip, struct mcp23s08, chip);
327 unsigned mask = 1 << offset;
330 mutex_lock(&mcp->lock);
331 status = __mcp23s08_set(mcp, mask, value);
333 mcp->cache[MCP_IODIR] &= ~mask;
334 status = mcp->ops->write(mcp, MCP_IODIR, mcp->cache[MCP_IODIR]);
336 mutex_unlock(&mcp->lock);
340 /*----------------------------------------------------------------------*/
341 static irqreturn_t mcp23s08_irq(int irq, void *data)
343 struct mcp23s08 *mcp = data;
345 unsigned int child_irq;
347 mutex_lock(&mcp->lock);
348 intf = mcp->ops->read(mcp, MCP_INTF);
350 mutex_unlock(&mcp->lock);
354 mcp->cache[MCP_INTF] = intf;
356 intcap = mcp->ops->read(mcp, MCP_INTCAP);
358 mutex_unlock(&mcp->lock);
362 mcp->cache[MCP_INTCAP] = intcap;
363 mutex_unlock(&mcp->lock);
366 for (i = 0; i < mcp->chip.ngpio; i++) {
367 if ((BIT(i) & mcp->cache[MCP_INTF]) &&
368 ((BIT(i) & intcap & mcp->irq_rise) ||
369 (mcp->irq_fall & ~intcap & BIT(i)))) {
370 child_irq = irq_find_mapping(mcp->irq_domain, i);
371 handle_nested_irq(child_irq);
378 static int mcp23s08_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
380 struct mcp23s08 *mcp = container_of(chip, struct mcp23s08, chip);
382 return irq_find_mapping(mcp->irq_domain, offset);
385 static void mcp23s08_irq_mask(struct irq_data *data)
387 struct mcp23s08 *mcp = irq_data_get_irq_chip_data(data);
388 unsigned int pos = data->hwirq;
390 mcp->cache[MCP_GPINTEN] &= ~BIT(pos);
393 static void mcp23s08_irq_unmask(struct irq_data *data)
395 struct mcp23s08 *mcp = irq_data_get_irq_chip_data(data);
396 unsigned int pos = data->hwirq;
398 mcp->cache[MCP_GPINTEN] |= BIT(pos);
401 static int mcp23s08_irq_set_type(struct irq_data *data, unsigned int type)
403 struct mcp23s08 *mcp = irq_data_get_irq_chip_data(data);
404 unsigned int pos = data->hwirq;
407 if ((type & IRQ_TYPE_EDGE_BOTH) == IRQ_TYPE_EDGE_BOTH) {
408 mcp->cache[MCP_INTCON] &= ~BIT(pos);
409 mcp->irq_rise |= BIT(pos);
410 mcp->irq_fall |= BIT(pos);
411 } else if (type & IRQ_TYPE_EDGE_RISING) {
412 mcp->cache[MCP_INTCON] &= ~BIT(pos);
413 mcp->irq_rise |= BIT(pos);
414 mcp->irq_fall &= ~BIT(pos);
415 } else if (type & IRQ_TYPE_EDGE_FALLING) {
416 mcp->cache[MCP_INTCON] &= ~BIT(pos);
417 mcp->irq_rise &= ~BIT(pos);
418 mcp->irq_fall |= BIT(pos);
425 static void mcp23s08_irq_bus_lock(struct irq_data *data)
427 struct mcp23s08 *mcp = irq_data_get_irq_chip_data(data);
429 mutex_lock(&mcp->irq_lock);
432 static void mcp23s08_irq_bus_unlock(struct irq_data *data)
434 struct mcp23s08 *mcp = irq_data_get_irq_chip_data(data);
436 mutex_lock(&mcp->lock);
437 mcp->ops->write(mcp, MCP_GPINTEN, mcp->cache[MCP_GPINTEN]);
438 mcp->ops->write(mcp, MCP_DEFVAL, mcp->cache[MCP_DEFVAL]);
439 mcp->ops->write(mcp, MCP_INTCON, mcp->cache[MCP_INTCON]);
440 mutex_unlock(&mcp->lock);
441 mutex_unlock(&mcp->irq_lock);
444 static int mcp23s08_irq_reqres(struct irq_data *data)
446 struct mcp23s08 *mcp = irq_data_get_irq_chip_data(data);
448 if (gpiochip_lock_as_irq(&mcp->chip, data->hwirq)) {
449 dev_err(mcp->chip.dev,
450 "unable to lock HW IRQ %lu for IRQ usage\n",
458 static void mcp23s08_irq_relres(struct irq_data *data)
460 struct mcp23s08 *mcp = irq_data_get_irq_chip_data(data);
462 gpiochip_unlock_as_irq(&mcp->chip, data->hwirq);
465 static struct irq_chip mcp23s08_irq_chip = {
466 .name = "gpio-mcp23xxx",
467 .irq_mask = mcp23s08_irq_mask,
468 .irq_unmask = mcp23s08_irq_unmask,
469 .irq_set_type = mcp23s08_irq_set_type,
470 .irq_bus_lock = mcp23s08_irq_bus_lock,
471 .irq_bus_sync_unlock = mcp23s08_irq_bus_unlock,
472 .irq_request_resources = mcp23s08_irq_reqres,
473 .irq_release_resources = mcp23s08_irq_relres,
476 static int mcp23s08_irq_setup(struct mcp23s08 *mcp)
478 struct gpio_chip *chip = &mcp->chip;
480 unsigned long irqflags = IRQF_ONESHOT | IRQF_SHARED;
482 mutex_init(&mcp->irq_lock);
484 mcp->irq_domain = irq_domain_add_linear(chip->dev->of_node, chip->ngpio,
485 &irq_domain_simple_ops, mcp);
486 if (!mcp->irq_domain)
489 if (mcp->irq_active_high)
490 irqflags |= IRQF_TRIGGER_HIGH;
492 irqflags |= IRQF_TRIGGER_LOW;
494 err = devm_request_threaded_irq(chip->dev, mcp->irq, NULL, mcp23s08_irq,
495 irqflags, dev_name(chip->dev), mcp);
497 dev_err(chip->dev, "unable to request IRQ#%d: %d\n",
502 chip->to_irq = mcp23s08_gpio_to_irq;
504 for (j = 0; j < mcp->chip.ngpio; j++) {
505 irq = irq_create_mapping(mcp->irq_domain, j);
506 irq_set_lockdep_class(irq, &gpio_lock_class);
507 irq_set_chip_data(irq, mcp);
508 irq_set_chip(irq, &mcp23s08_irq_chip);
509 irq_set_nested_thread(irq, true);
511 set_irq_flags(irq, IRQF_VALID);
513 irq_set_noprobe(irq);
519 static void mcp23s08_irq_teardown(struct mcp23s08 *mcp)
523 for (i = 0; i < mcp->chip.ngpio; i++) {
524 irq = irq_find_mapping(mcp->irq_domain, i);
526 irq_dispose_mapping(irq);
529 irq_domain_remove(mcp->irq_domain);
532 /*----------------------------------------------------------------------*/
534 #ifdef CONFIG_DEBUG_FS
536 #include <linux/seq_file.h>
539 * This shows more info than the generic gpio dump code:
540 * pullups, deglitching, open drain drive.
542 static void mcp23s08_dbg_show(struct seq_file *s, struct gpio_chip *chip)
544 struct mcp23s08 *mcp;
549 mcp = container_of(chip, struct mcp23s08, chip);
551 /* NOTE: we only handle one bank for now ... */
552 bank = '0' + ((mcp->addr >> 1) & 0x7);
554 mutex_lock(&mcp->lock);
555 t = mcp->ops->read_regs(mcp, 0, mcp->cache, ARRAY_SIZE(mcp->cache));
557 seq_printf(s, " I/O ERROR %d\n", t);
561 for (t = 0, mask = 1; t < chip->ngpio; t++, mask <<= 1) {
564 label = gpiochip_is_requested(chip, t);
568 seq_printf(s, " gpio-%-3d P%c.%d (%-12s) %s %s %s",
569 chip->base + t, bank, t, label,
570 (mcp->cache[MCP_IODIR] & mask) ? "in " : "out",
571 (mcp->cache[MCP_GPIO] & mask) ? "hi" : "lo",
572 (mcp->cache[MCP_GPPU] & mask) ? "up" : " ");
573 /* NOTE: ignoring the irq-related registers */
577 mutex_unlock(&mcp->lock);
581 #define mcp23s08_dbg_show NULL
584 /*----------------------------------------------------------------------*/
586 static int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev,
587 void *data, unsigned addr, unsigned type,
588 struct mcp23s08_platform_data *pdata, int cs)
593 mutex_init(&mcp->lock);
597 mcp->irq_active_high = false;
599 mcp->chip.direction_input = mcp23s08_direction_input;
600 mcp->chip.get = mcp23s08_get;
601 mcp->chip.direction_output = mcp23s08_direction_output;
602 mcp->chip.set = mcp23s08_set;
603 mcp->chip.dbg_show = mcp23s08_dbg_show;
605 mcp->chip.of_gpio_n_cells = 2;
606 mcp->chip.of_node = dev->of_node;
610 #ifdef CONFIG_SPI_MASTER
612 mcp->ops = &mcp23s08_ops;
614 mcp->chip.label = "mcp23s08";
618 mcp->ops = &mcp23s17_ops;
619 mcp->chip.ngpio = 16;
620 mcp->chip.label = "mcp23s17";
622 #endif /* CONFIG_SPI_MASTER */
624 #if IS_ENABLED(CONFIG_I2C)
626 mcp->ops = &mcp23008_ops;
628 mcp->chip.label = "mcp23008";
632 mcp->ops = &mcp23017_ops;
633 mcp->chip.ngpio = 16;
634 mcp->chip.label = "mcp23017";
636 #endif /* CONFIG_I2C */
639 dev_err(dev, "invalid device type (%d)\n", type);
643 mcp->chip.base = pdata->base;
644 mcp->chip.can_sleep = true;
646 mcp->chip.owner = THIS_MODULE;
648 /* verify MCP_IOCON.SEQOP = 0, so sequential reads work,
649 * and MCP_IOCON.HAEN = 1, so we work with all chips.
652 status = mcp->ops->read(mcp, MCP_IOCON);
656 mcp->irq_controller = pdata->irq_controller;
657 if (mcp->irq && mcp->irq_controller) {
658 mcp->irq_active_high =
659 of_property_read_bool(mcp->chip.dev->of_node,
660 "microchip,irq-active-high");
662 if (type == MCP_TYPE_017)
663 mirror = pdata->mirror;
666 if ((status & IOCON_SEQOP) || !(status & IOCON_HAEN) || mirror ||
667 mcp->irq_active_high) {
668 /* mcp23s17 has IOCON twice, make sure they are in sync */
669 status &= ~(IOCON_SEQOP | (IOCON_SEQOP << 8));
670 status |= IOCON_HAEN | (IOCON_HAEN << 8);
671 if (mcp->irq_active_high)
672 status |= IOCON_INTPOL | (IOCON_INTPOL << 8);
674 status &= ~(IOCON_INTPOL | (IOCON_INTPOL << 8));
677 status |= IOCON_MIRROR | (IOCON_MIRROR << 8);
679 status = mcp->ops->write(mcp, MCP_IOCON, status);
684 /* configure ~100K pullups */
685 status = mcp->ops->write(mcp, MCP_GPPU, pdata->chip[cs].pullups);
689 status = mcp->ops->read_regs(mcp, 0, mcp->cache, ARRAY_SIZE(mcp->cache));
693 /* disable inverter on input */
694 if (mcp->cache[MCP_IPOL] != 0) {
695 mcp->cache[MCP_IPOL] = 0;
696 status = mcp->ops->write(mcp, MCP_IPOL, 0);
702 if (mcp->cache[MCP_GPINTEN] != 0) {
703 mcp->cache[MCP_GPINTEN] = 0;
704 status = mcp->ops->write(mcp, MCP_GPINTEN, 0);
709 status = gpiochip_add(&mcp->chip);
713 if (mcp->irq && mcp->irq_controller) {
714 status = mcp23s08_irq_setup(mcp);
716 mcp23s08_irq_teardown(mcp);
722 dev_dbg(dev, "can't setup chip %d, --> %d\n",
727 /*----------------------------------------------------------------------*/
730 #ifdef CONFIG_SPI_MASTER
731 static const struct of_device_id mcp23s08_spi_of_match[] = {
733 .compatible = "microchip,mcp23s08",
734 .data = (void *) MCP_TYPE_S08,
737 .compatible = "microchip,mcp23s17",
738 .data = (void *) MCP_TYPE_S17,
740 /* NOTE: The use of the mcp prefix is deprecated and will be removed. */
742 .compatible = "mcp,mcp23s08",
743 .data = (void *) MCP_TYPE_S08,
746 .compatible = "mcp,mcp23s17",
747 .data = (void *) MCP_TYPE_S17,
751 MODULE_DEVICE_TABLE(of, mcp23s08_spi_of_match);
754 #if IS_ENABLED(CONFIG_I2C)
755 static const struct of_device_id mcp23s08_i2c_of_match[] = {
757 .compatible = "microchip,mcp23008",
758 .data = (void *) MCP_TYPE_008,
761 .compatible = "microchip,mcp23017",
762 .data = (void *) MCP_TYPE_017,
764 /* NOTE: The use of the mcp prefix is deprecated and will be removed. */
766 .compatible = "mcp,mcp23008",
767 .data = (void *) MCP_TYPE_008,
770 .compatible = "mcp,mcp23017",
771 .data = (void *) MCP_TYPE_017,
775 MODULE_DEVICE_TABLE(of, mcp23s08_i2c_of_match);
777 #endif /* CONFIG_OF */
780 #if IS_ENABLED(CONFIG_I2C)
782 static int mcp230xx_probe(struct i2c_client *client,
783 const struct i2c_device_id *id)
785 struct mcp23s08_platform_data *pdata, local_pdata;
786 struct mcp23s08 *mcp;
788 const struct of_device_id *match;
790 match = of_match_device(of_match_ptr(mcp23s08_i2c_of_match),
793 pdata = &local_pdata;
795 pdata->chip[0].pullups = 0;
796 pdata->irq_controller = of_property_read_bool(
798 "interrupt-controller");
799 pdata->mirror = of_property_read_bool(client->dev.of_node,
800 "microchip,irq-mirror");
801 client->irq = irq_of_parse_and_map(client->dev.of_node, 0);
803 pdata = dev_get_platdata(&client->dev);
805 pdata = devm_kzalloc(&client->dev,
806 sizeof(struct mcp23s08_platform_data),
812 mcp = kzalloc(sizeof(*mcp), GFP_KERNEL);
816 mcp->irq = client->irq;
817 status = mcp23s08_probe_one(mcp, &client->dev, client, client->addr,
818 id->driver_data, pdata, 0);
822 i2c_set_clientdata(client, mcp);
832 static int mcp230xx_remove(struct i2c_client *client)
834 struct mcp23s08 *mcp = i2c_get_clientdata(client);
836 if (client->irq && mcp->irq_controller)
837 mcp23s08_irq_teardown(mcp);
839 gpiochip_remove(&mcp->chip);
845 static const struct i2c_device_id mcp230xx_id[] = {
846 { "mcp23008", MCP_TYPE_008 },
847 { "mcp23017", MCP_TYPE_017 },
850 MODULE_DEVICE_TABLE(i2c, mcp230xx_id);
852 static struct i2c_driver mcp230xx_driver = {
855 .owner = THIS_MODULE,
856 .of_match_table = of_match_ptr(mcp23s08_i2c_of_match),
858 .probe = mcp230xx_probe,
859 .remove = mcp230xx_remove,
860 .id_table = mcp230xx_id,
863 static int __init mcp23s08_i2c_init(void)
865 return i2c_add_driver(&mcp230xx_driver);
868 static void mcp23s08_i2c_exit(void)
870 i2c_del_driver(&mcp230xx_driver);
875 static int __init mcp23s08_i2c_init(void) { return 0; }
876 static void mcp23s08_i2c_exit(void) { }
878 #endif /* CONFIG_I2C */
880 /*----------------------------------------------------------------------*/
882 #ifdef CONFIG_SPI_MASTER
884 static int mcp23s08_probe(struct spi_device *spi)
886 struct mcp23s08_platform_data *pdata, local_pdata;
889 struct mcp23s08_driver_data *data;
892 const struct of_device_id *match;
893 u32 spi_present_mask = 0;
895 match = of_match_device(of_match_ptr(mcp23s08_spi_of_match), &spi->dev);
897 type = (int)(uintptr_t)match->data;
898 status = of_property_read_u32(spi->dev.of_node,
899 "microchip,spi-present-mask", &spi_present_mask);
901 status = of_property_read_u32(spi->dev.of_node,
902 "mcp,spi-present-mask", &spi_present_mask);
905 "DT has no spi-present-mask\n");
909 if ((spi_present_mask <= 0) || (spi_present_mask >= 256)) {
910 dev_err(&spi->dev, "invalid spi-present-mask\n");
914 pdata = &local_pdata;
916 for (addr = 0; addr < ARRAY_SIZE(pdata->chip); addr++) {
917 pdata->chip[addr].pullups = 0;
918 if (spi_present_mask & (1 << addr))
921 pdata->irq_controller = of_property_read_bool(
923 "interrupt-controller");
924 pdata->mirror = of_property_read_bool(spi->dev.of_node,
925 "microchip,irq-mirror");
927 type = spi_get_device_id(spi)->driver_data;
928 pdata = dev_get_platdata(&spi->dev);
930 pdata = devm_kzalloc(&spi->dev,
931 sizeof(struct mcp23s08_platform_data),
936 for (addr = 0; addr < ARRAY_SIZE(pdata->chip); addr++) {
937 if (!pdata->chip[addr].is_present)
940 if ((type == MCP_TYPE_S08) && (addr > 3)) {
942 "mcp23s08 only supports address 0..3\n");
945 spi_present_mask |= 1 << addr;
952 data = devm_kzalloc(&spi->dev,
953 sizeof(*data) + chips * sizeof(struct mcp23s08),
958 spi_set_drvdata(spi, data);
960 spi->irq = irq_of_parse_and_map(spi->dev.of_node, 0);
962 for (addr = 0; addr < ARRAY_SIZE(pdata->chip); addr++) {
963 if (!(spi_present_mask & (1 << addr)))
966 data->mcp[addr] = &data->chip[chips];
967 data->mcp[addr]->irq = spi->irq;
968 status = mcp23s08_probe_one(data->mcp[addr], &spi->dev, spi,
969 0x40 | (addr << 1), type, pdata,
974 if (pdata->base != -1)
975 pdata->base += (type == MCP_TYPE_S17) ? 16 : 8;
976 ngpio += (type == MCP_TYPE_S17) ? 16 : 8;
980 /* NOTE: these chips have a relatively sane IRQ framework, with
981 * per-signal masking and level/edge triggering. It's not yet
988 for (addr = 0; addr < ARRAY_SIZE(data->mcp); addr++) {
990 if (!data->mcp[addr])
992 gpiochip_remove(&data->mcp[addr]->chip);
997 static int mcp23s08_remove(struct spi_device *spi)
999 struct mcp23s08_driver_data *data = spi_get_drvdata(spi);
1002 for (addr = 0; addr < ARRAY_SIZE(data->mcp); addr++) {
1004 if (!data->mcp[addr])
1007 if (spi->irq && data->mcp[addr]->irq_controller)
1008 mcp23s08_irq_teardown(data->mcp[addr]);
1009 gpiochip_remove(&data->mcp[addr]->chip);
1015 static const struct spi_device_id mcp23s08_ids[] = {
1016 { "mcp23s08", MCP_TYPE_S08 },
1017 { "mcp23s17", MCP_TYPE_S17 },
1020 MODULE_DEVICE_TABLE(spi, mcp23s08_ids);
1022 static struct spi_driver mcp23s08_driver = {
1023 .probe = mcp23s08_probe,
1024 .remove = mcp23s08_remove,
1025 .id_table = mcp23s08_ids,
1028 .owner = THIS_MODULE,
1029 .of_match_table = of_match_ptr(mcp23s08_spi_of_match),
1033 static int __init mcp23s08_spi_init(void)
1035 return spi_register_driver(&mcp23s08_driver);
1038 static void mcp23s08_spi_exit(void)
1040 spi_unregister_driver(&mcp23s08_driver);
1045 static int __init mcp23s08_spi_init(void) { return 0; }
1046 static void mcp23s08_spi_exit(void) { }
1048 #endif /* CONFIG_SPI_MASTER */
1050 /*----------------------------------------------------------------------*/
1052 static int __init mcp23s08_init(void)
1056 ret = mcp23s08_spi_init();
1060 ret = mcp23s08_i2c_init();
1067 mcp23s08_spi_exit();
1071 /* register after spi/i2c postcore initcall and before
1072 * subsys initcalls that may rely on these GPIOs
1074 subsys_initcall(mcp23s08_init);
1076 static void __exit mcp23s08_exit(void)
1078 mcp23s08_spi_exit();
1079 mcp23s08_i2c_exit();
1081 module_exit(mcp23s08_exit);
1083 MODULE_LICENSE("GPL");