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);
74 /* lock protects the cached values */
76 struct mutex irq_lock;
77 struct irq_domain *irq_domain;
79 struct gpio_chip chip;
81 const struct mcp23s08_ops *ops;
82 void *data; /* ops specific data */
85 /* A given spi_device can represent up to eight mcp23sxx chips
86 * sharing the same chipselect but using different addresses
87 * (e.g. chips #0 and #3 might be populated, but not #1 or $2).
88 * Driver data holds all the per-chip data.
90 struct mcp23s08_driver_data {
92 struct mcp23s08 *mcp[8];
93 struct mcp23s08 chip[];
96 /* This lock class tells lockdep that GPIO irqs are in a different
97 * category than their parents, so it won't report false recursion.
99 static struct lock_class_key gpio_lock_class;
101 /*----------------------------------------------------------------------*/
103 #if IS_ENABLED(CONFIG_I2C)
105 static int mcp23008_read(struct mcp23s08 *mcp, unsigned reg)
107 return i2c_smbus_read_byte_data(mcp->data, reg);
110 static int mcp23008_write(struct mcp23s08 *mcp, unsigned reg, unsigned val)
112 return i2c_smbus_write_byte_data(mcp->data, reg, val);
116 mcp23008_read_regs(struct mcp23s08 *mcp, unsigned reg, u16 *vals, unsigned n)
119 int ret = mcp23008_read(mcp, reg++);
128 static int mcp23017_read(struct mcp23s08 *mcp, unsigned reg)
130 return i2c_smbus_read_word_data(mcp->data, reg << 1);
133 static int mcp23017_write(struct mcp23s08 *mcp, unsigned reg, unsigned val)
135 return i2c_smbus_write_word_data(mcp->data, reg << 1, val);
139 mcp23017_read_regs(struct mcp23s08 *mcp, unsigned reg, u16 *vals, unsigned n)
142 int ret = mcp23017_read(mcp, reg++);
151 static const struct mcp23s08_ops mcp23008_ops = {
152 .read = mcp23008_read,
153 .write = mcp23008_write,
154 .read_regs = mcp23008_read_regs,
157 static const struct mcp23s08_ops mcp23017_ops = {
158 .read = mcp23017_read,
159 .write = mcp23017_write,
160 .read_regs = mcp23017_read_regs,
163 #endif /* CONFIG_I2C */
165 /*----------------------------------------------------------------------*/
167 #ifdef CONFIG_SPI_MASTER
169 static int mcp23s08_read(struct mcp23s08 *mcp, unsigned reg)
174 tx[0] = mcp->addr | 0x01;
176 status = spi_write_then_read(mcp->data, tx, sizeof(tx), rx, sizeof(rx));
177 return (status < 0) ? status : rx[0];
180 static int mcp23s08_write(struct mcp23s08 *mcp, unsigned reg, unsigned val)
187 return spi_write_then_read(mcp->data, tx, sizeof(tx), NULL, 0);
191 mcp23s08_read_regs(struct mcp23s08 *mcp, unsigned reg, u16 *vals, unsigned n)
196 if ((n + reg) > sizeof(mcp->cache))
198 tx[0] = mcp->addr | 0x01;
202 status = spi_write_then_read(mcp->data, tx, sizeof(tx), tmp, n);
205 vals[n] = tmp[n]; /* expand to 16bit */
210 static int mcp23s17_read(struct mcp23s08 *mcp, unsigned reg)
215 tx[0] = mcp->addr | 0x01;
217 status = spi_write_then_read(mcp->data, tx, sizeof(tx), rx, sizeof(rx));
218 return (status < 0) ? status : (rx[0] | (rx[1] << 8));
221 static int mcp23s17_write(struct mcp23s08 *mcp, unsigned reg, unsigned val)
229 return spi_write_then_read(mcp->data, tx, sizeof(tx), NULL, 0);
233 mcp23s17_read_regs(struct mcp23s08 *mcp, unsigned reg, u16 *vals, unsigned n)
238 if ((n + reg) > sizeof(mcp->cache))
240 tx[0] = mcp->addr | 0x01;
243 status = spi_write_then_read(mcp->data, tx, sizeof(tx),
247 vals[n] = __le16_to_cpu((__le16)vals[n]);
253 static const struct mcp23s08_ops mcp23s08_ops = {
254 .read = mcp23s08_read,
255 .write = mcp23s08_write,
256 .read_regs = mcp23s08_read_regs,
259 static const struct mcp23s08_ops mcp23s17_ops = {
260 .read = mcp23s17_read,
261 .write = mcp23s17_write,
262 .read_regs = mcp23s17_read_regs,
265 #endif /* CONFIG_SPI_MASTER */
267 /*----------------------------------------------------------------------*/
269 static int mcp23s08_direction_input(struct gpio_chip *chip, unsigned offset)
271 struct mcp23s08 *mcp = container_of(chip, struct mcp23s08, chip);
274 mutex_lock(&mcp->lock);
275 mcp->cache[MCP_IODIR] |= (1 << offset);
276 status = mcp->ops->write(mcp, MCP_IODIR, mcp->cache[MCP_IODIR]);
277 mutex_unlock(&mcp->lock);
281 static int mcp23s08_get(struct gpio_chip *chip, unsigned offset)
283 struct mcp23s08 *mcp = container_of(chip, struct mcp23s08, chip);
286 mutex_lock(&mcp->lock);
288 /* REVISIT reading this clears any IRQ ... */
289 status = mcp->ops->read(mcp, MCP_GPIO);
293 mcp->cache[MCP_GPIO] = status;
294 status = !!(status & (1 << offset));
296 mutex_unlock(&mcp->lock);
300 static int __mcp23s08_set(struct mcp23s08 *mcp, unsigned mask, int value)
302 unsigned olat = mcp->cache[MCP_OLAT];
308 mcp->cache[MCP_OLAT] = olat;
309 return mcp->ops->write(mcp, MCP_OLAT, olat);
312 static void mcp23s08_set(struct gpio_chip *chip, unsigned offset, int value)
314 struct mcp23s08 *mcp = container_of(chip, struct mcp23s08, chip);
315 unsigned mask = 1 << offset;
317 mutex_lock(&mcp->lock);
318 __mcp23s08_set(mcp, mask, value);
319 mutex_unlock(&mcp->lock);
323 mcp23s08_direction_output(struct gpio_chip *chip, unsigned offset, int value)
325 struct mcp23s08 *mcp = container_of(chip, struct mcp23s08, chip);
326 unsigned mask = 1 << offset;
329 mutex_lock(&mcp->lock);
330 status = __mcp23s08_set(mcp, mask, value);
332 mcp->cache[MCP_IODIR] &= ~mask;
333 status = mcp->ops->write(mcp, MCP_IODIR, mcp->cache[MCP_IODIR]);
335 mutex_unlock(&mcp->lock);
339 /*----------------------------------------------------------------------*/
340 static irqreturn_t mcp23s08_irq(int irq, void *data)
342 struct mcp23s08 *mcp = data;
343 int intcap, intf, i, gpio, gpio_orig, intcap_mask;
344 unsigned int child_irq;
345 bool intf_set, intcap_changed, gpio_bit_changed,
348 mutex_lock(&mcp->lock);
349 intf = mcp->ops->read(mcp, MCP_INTF);
351 mutex_unlock(&mcp->lock);
355 mcp->cache[MCP_INTF] = intf;
357 intcap = mcp->ops->read(mcp, MCP_INTCAP);
359 mutex_unlock(&mcp->lock);
363 mcp->cache[MCP_INTCAP] = intcap;
365 /* This clears the interrupt(configurable on S18) */
366 if ((gpio = mcp->ops->read(mcp, MCP_GPIO)) < 0) {
367 mutex_unlock(&mcp->lock);
370 gpio_orig = mcp->cache[MCP_GPIO];
371 mcp->cache[MCP_GPIO] = gpio;
372 mutex_unlock(&mcp->lock);
374 if (mcp->cache[MCP_INTF] == 0) {
375 /* There is no interrupt pending */
379 dev_dbg(mcp->chip.dev,
380 "intcap 0x%04X intf 0x%04X gpio_orig 0x%04X gpio 0x%04X\n",
381 intcap, intf, gpio_orig, gpio);
383 for (i = 0; i < mcp->chip.ngpio; i++) {
384 /* We must check all of the inputs on the chip,
385 * otherwise we may not notice a change on >=2 pins.
387 * On at least the mcp23s17, INTCAP is only updated
388 * one byte at a time(INTCAPA and INTCAPB are
389 * not written to at the same time - only on a per-bank
392 * INTF only contains the single bit that caused the
393 * interrupt per-bank. On the mcp23s17, there is
394 * INTFA and INTFB. If two pins are changed on the A
395 * side at the same time, INTF will only have one bit
396 * set. If one pin on the A side and one pin on the B
397 * side are changed at the same time, INTF will have
398 * two bits set. Thus, INTF can't be the only check
399 * to see if the input has changed.
402 intf_set = BIT(i) & mcp->cache[MCP_INTF];
403 if (i < 8 && intf_set)
404 intcap_mask = 0x00FF;
405 else if (i >= 8 && intf_set)
406 intcap_mask = 0xFF00;
410 intcap_changed = (intcap_mask &
411 (BIT(i) & mcp->cache[MCP_INTCAP])) !=
412 (intcap_mask & (BIT(i) & gpio_orig));
413 gpio_set = BIT(i) & mcp->cache[MCP_GPIO];
414 gpio_bit_changed = (BIT(i) & gpio_orig) !=
415 (BIT(i) & mcp->cache[MCP_GPIO]);
417 if (((gpio_bit_changed || intcap_changed) &&
418 (BIT(i) & mcp->irq_rise) && gpio_set) ||
419 ((gpio_bit_changed || intcap_changed) &&
420 (BIT(i) & mcp->irq_fall) && !gpio_set)) {
421 child_irq = irq_find_mapping(mcp->irq_domain, i);
422 handle_nested_irq(child_irq);
429 static int mcp23s08_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
431 struct mcp23s08 *mcp = container_of(chip, struct mcp23s08, chip);
433 return irq_find_mapping(mcp->irq_domain, offset);
436 static void mcp23s08_irq_mask(struct irq_data *data)
438 struct mcp23s08 *mcp = irq_data_get_irq_chip_data(data);
439 unsigned int pos = data->hwirq;
441 mcp->cache[MCP_GPINTEN] &= ~BIT(pos);
444 static void mcp23s08_irq_unmask(struct irq_data *data)
446 struct mcp23s08 *mcp = irq_data_get_irq_chip_data(data);
447 unsigned int pos = data->hwirq;
449 mcp->cache[MCP_GPINTEN] |= BIT(pos);
452 static int mcp23s08_irq_set_type(struct irq_data *data, unsigned int type)
454 struct mcp23s08 *mcp = irq_data_get_irq_chip_data(data);
455 unsigned int pos = data->hwirq;
458 if ((type & IRQ_TYPE_EDGE_BOTH) == IRQ_TYPE_EDGE_BOTH) {
459 mcp->cache[MCP_INTCON] &= ~BIT(pos);
460 mcp->irq_rise |= BIT(pos);
461 mcp->irq_fall |= BIT(pos);
462 } else if (type & IRQ_TYPE_EDGE_RISING) {
463 mcp->cache[MCP_INTCON] &= ~BIT(pos);
464 mcp->irq_rise |= BIT(pos);
465 mcp->irq_fall &= ~BIT(pos);
466 } else if (type & IRQ_TYPE_EDGE_FALLING) {
467 mcp->cache[MCP_INTCON] &= ~BIT(pos);
468 mcp->irq_rise &= ~BIT(pos);
469 mcp->irq_fall |= BIT(pos);
476 static void mcp23s08_irq_bus_lock(struct irq_data *data)
478 struct mcp23s08 *mcp = irq_data_get_irq_chip_data(data);
480 mutex_lock(&mcp->irq_lock);
483 static void mcp23s08_irq_bus_unlock(struct irq_data *data)
485 struct mcp23s08 *mcp = irq_data_get_irq_chip_data(data);
487 mutex_lock(&mcp->lock);
488 mcp->ops->write(mcp, MCP_GPINTEN, mcp->cache[MCP_GPINTEN]);
489 mcp->ops->write(mcp, MCP_DEFVAL, mcp->cache[MCP_DEFVAL]);
490 mcp->ops->write(mcp, MCP_INTCON, mcp->cache[MCP_INTCON]);
491 mutex_unlock(&mcp->lock);
492 mutex_unlock(&mcp->irq_lock);
495 static int mcp23s08_irq_reqres(struct irq_data *data)
497 struct mcp23s08 *mcp = irq_data_get_irq_chip_data(data);
499 if (gpio_lock_as_irq(&mcp->chip, data->hwirq)) {
500 dev_err(mcp->chip.dev,
501 "unable to lock HW IRQ %lu for IRQ usage\n",
509 static void mcp23s08_irq_relres(struct irq_data *data)
511 struct mcp23s08 *mcp = irq_data_get_irq_chip_data(data);
513 gpio_unlock_as_irq(&mcp->chip, data->hwirq);
516 static struct irq_chip mcp23s08_irq_chip = {
517 .name = "gpio-mcp23xxx",
518 .irq_mask = mcp23s08_irq_mask,
519 .irq_unmask = mcp23s08_irq_unmask,
520 .irq_set_type = mcp23s08_irq_set_type,
521 .irq_bus_lock = mcp23s08_irq_bus_lock,
522 .irq_bus_sync_unlock = mcp23s08_irq_bus_unlock,
523 .irq_request_resources = mcp23s08_irq_reqres,
524 .irq_release_resources = mcp23s08_irq_relres,
527 static int mcp23s08_irq_setup(struct mcp23s08 *mcp)
529 struct gpio_chip *chip = &mcp->chip;
532 mutex_init(&mcp->irq_lock);
534 mcp->irq_domain = irq_domain_add_linear(chip->of_node, chip->ngpio,
535 &irq_domain_simple_ops, mcp);
536 if (!mcp->irq_domain)
539 err = devm_request_threaded_irq(chip->dev, mcp->irq, NULL, mcp23s08_irq,
540 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
541 dev_name(chip->dev), mcp);
543 dev_err(chip->dev, "unable to request IRQ#%d: %d\n",
548 chip->to_irq = mcp23s08_gpio_to_irq;
550 for (j = 0; j < mcp->chip.ngpio; j++) {
551 irq = irq_create_mapping(mcp->irq_domain, j);
552 irq_set_lockdep_class(irq, &gpio_lock_class);
553 irq_set_chip_data(irq, mcp);
554 irq_set_chip(irq, &mcp23s08_irq_chip);
555 irq_set_nested_thread(irq, true);
557 set_irq_flags(irq, IRQF_VALID);
559 irq_set_noprobe(irq);
565 static void mcp23s08_irq_teardown(struct mcp23s08 *mcp)
569 free_irq(mcp->irq, mcp);
571 for (i = 0; i < mcp->chip.ngpio; i++) {
572 irq = irq_find_mapping(mcp->irq_domain, i);
574 irq_dispose_mapping(irq);
577 irq_domain_remove(mcp->irq_domain);
580 /*----------------------------------------------------------------------*/
582 #ifdef CONFIG_DEBUG_FS
584 #include <linux/seq_file.h>
587 * This shows more info than the generic gpio dump code:
588 * pullups, deglitching, open drain drive.
590 static void mcp23s08_dbg_show(struct seq_file *s, struct gpio_chip *chip)
592 struct mcp23s08 *mcp;
597 mcp = container_of(chip, struct mcp23s08, chip);
599 /* NOTE: we only handle one bank for now ... */
600 bank = '0' + ((mcp->addr >> 1) & 0x7);
602 mutex_lock(&mcp->lock);
603 t = mcp->ops->read_regs(mcp, 0, mcp->cache, ARRAY_SIZE(mcp->cache));
605 seq_printf(s, " I/O ERROR %d\n", t);
609 for (t = 0, mask = 1; t < chip->ngpio; t++, mask <<= 1) {
612 label = gpiochip_is_requested(chip, t);
616 seq_printf(s, " gpio-%-3d P%c.%d (%-12s) %s %s %s",
617 chip->base + t, bank, t, label,
618 (mcp->cache[MCP_IODIR] & mask) ? "in " : "out",
619 (mcp->cache[MCP_GPIO] & mask) ? "hi" : "lo",
620 (mcp->cache[MCP_GPPU] & mask) ? "up" : " ");
621 /* NOTE: ignoring the irq-related registers */
625 mutex_unlock(&mcp->lock);
629 #define mcp23s08_dbg_show NULL
632 /*----------------------------------------------------------------------*/
634 static int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev,
635 void *data, unsigned addr, unsigned type,
636 unsigned base, unsigned pullups)
641 mutex_init(&mcp->lock);
646 mcp->chip.direction_input = mcp23s08_direction_input;
647 mcp->chip.get = mcp23s08_get;
648 mcp->chip.direction_output = mcp23s08_direction_output;
649 mcp->chip.set = mcp23s08_set;
650 mcp->chip.dbg_show = mcp23s08_dbg_show;
652 mcp->chip.of_gpio_n_cells = 2;
653 mcp->chip.of_node = dev->of_node;
657 #ifdef CONFIG_SPI_MASTER
659 mcp->ops = &mcp23s08_ops;
661 mcp->chip.label = "mcp23s08";
665 mcp->ops = &mcp23s17_ops;
666 mcp->chip.ngpio = 16;
667 mcp->chip.label = "mcp23s17";
669 #endif /* CONFIG_SPI_MASTER */
671 #if IS_ENABLED(CONFIG_I2C)
673 mcp->ops = &mcp23008_ops;
675 mcp->chip.label = "mcp23008";
679 mcp->ops = &mcp23017_ops;
680 mcp->chip.ngpio = 16;
681 mcp->chip.label = "mcp23017";
683 #endif /* CONFIG_I2C */
686 dev_err(dev, "invalid device type (%d)\n", type);
690 mcp->chip.base = base;
691 mcp->chip.can_sleep = true;
693 mcp->chip.owner = THIS_MODULE;
695 /* verify MCP_IOCON.SEQOP = 0, so sequential reads work,
696 * and MCP_IOCON.HAEN = 1, so we work with all chips.
699 status = mcp->ops->read(mcp, MCP_IOCON);
703 mcp->irq_controller = of_property_read_bool(mcp->chip.of_node,
704 "interrupt-controller");
705 if (mcp->irq && mcp->irq_controller && (type == MCP_TYPE_017))
706 mirror = of_property_read_bool(mcp->chip.of_node,
707 "microchip,irq-mirror");
709 if ((status & IOCON_SEQOP) || !(status & IOCON_HAEN) || mirror) {
710 /* mcp23s17 has IOCON twice, make sure they are in sync */
711 status &= ~(IOCON_SEQOP | (IOCON_SEQOP << 8));
712 status |= IOCON_HAEN | (IOCON_HAEN << 8);
713 status &= ~(IOCON_INTPOL | (IOCON_INTPOL << 8));
715 status |= IOCON_MIRROR | (IOCON_MIRROR << 8);
717 status = mcp->ops->write(mcp, MCP_IOCON, status);
722 /* configure ~100K pullups */
723 status = mcp->ops->write(mcp, MCP_GPPU, pullups);
727 status = mcp->ops->read_regs(mcp, 0, mcp->cache, ARRAY_SIZE(mcp->cache));
731 /* disable inverter on input */
732 if (mcp->cache[MCP_IPOL] != 0) {
733 mcp->cache[MCP_IPOL] = 0;
734 status = mcp->ops->write(mcp, MCP_IPOL, 0);
740 if (mcp->cache[MCP_GPINTEN] != 0) {
741 mcp->cache[MCP_GPINTEN] = 0;
742 status = mcp->ops->write(mcp, MCP_GPINTEN, 0);
747 status = gpiochip_add(&mcp->chip);
751 if (mcp->irq && mcp->irq_controller) {
752 status = mcp23s08_irq_setup(mcp);
754 mcp23s08_irq_teardown(mcp);
760 dev_dbg(dev, "can't setup chip %d, --> %d\n",
765 /*----------------------------------------------------------------------*/
768 #ifdef CONFIG_SPI_MASTER
769 static const struct of_device_id mcp23s08_spi_of_match[] = {
771 .compatible = "microchip,mcp23s08",
772 .data = (void *) MCP_TYPE_S08,
775 .compatible = "microchip,mcp23s17",
776 .data = (void *) MCP_TYPE_S17,
778 /* NOTE: The use of the mcp prefix is deprecated and will be removed. */
780 .compatible = "mcp,mcp23s08",
781 .data = (void *) MCP_TYPE_S08,
784 .compatible = "mcp,mcp23s17",
785 .data = (void *) MCP_TYPE_S17,
789 MODULE_DEVICE_TABLE(of, mcp23s08_spi_of_match);
792 #if IS_ENABLED(CONFIG_I2C)
793 static const struct of_device_id mcp23s08_i2c_of_match[] = {
795 .compatible = "microchip,mcp23008",
796 .data = (void *) MCP_TYPE_008,
799 .compatible = "microchip,mcp23017",
800 .data = (void *) MCP_TYPE_017,
802 /* NOTE: The use of the mcp prefix is deprecated and will be removed. */
804 .compatible = "mcp,mcp23008",
805 .data = (void *) MCP_TYPE_008,
808 .compatible = "mcp,mcp23017",
809 .data = (void *) MCP_TYPE_017,
813 MODULE_DEVICE_TABLE(of, mcp23s08_i2c_of_match);
815 #endif /* CONFIG_OF */
818 #if IS_ENABLED(CONFIG_I2C)
820 static int mcp230xx_probe(struct i2c_client *client,
821 const struct i2c_device_id *id)
823 struct mcp23s08_platform_data *pdata;
824 struct mcp23s08 *mcp;
825 int status, base, pullups;
826 const struct of_device_id *match;
828 match = of_match_device(of_match_ptr(mcp23s08_i2c_of_match),
830 pdata = dev_get_platdata(&client->dev);
831 if (match || !pdata) {
834 client->irq = irq_of_parse_and_map(client->dev.of_node, 0);
836 if (!gpio_is_valid(pdata->base)) {
837 dev_dbg(&client->dev, "invalid platform data\n");
841 pullups = pdata->chip[0].pullups;
844 mcp = kzalloc(sizeof(*mcp), GFP_KERNEL);
848 mcp->irq = client->irq;
849 status = mcp23s08_probe_one(mcp, &client->dev, client, client->addr,
850 id->driver_data, base, pullups);
854 i2c_set_clientdata(client, mcp);
864 static int mcp230xx_remove(struct i2c_client *client)
866 struct mcp23s08 *mcp = i2c_get_clientdata(client);
869 if (client->irq && mcp->irq_controller)
870 mcp23s08_irq_teardown(mcp);
872 status = gpiochip_remove(&mcp->chip);
879 static const struct i2c_device_id mcp230xx_id[] = {
880 { "mcp23008", MCP_TYPE_008 },
881 { "mcp23017", MCP_TYPE_017 },
884 MODULE_DEVICE_TABLE(i2c, mcp230xx_id);
886 static struct i2c_driver mcp230xx_driver = {
889 .owner = THIS_MODULE,
890 .of_match_table = of_match_ptr(mcp23s08_i2c_of_match),
892 .probe = mcp230xx_probe,
893 .remove = mcp230xx_remove,
894 .id_table = mcp230xx_id,
897 static int __init mcp23s08_i2c_init(void)
899 return i2c_add_driver(&mcp230xx_driver);
902 static void mcp23s08_i2c_exit(void)
904 i2c_del_driver(&mcp230xx_driver);
909 static int __init mcp23s08_i2c_init(void) { return 0; }
910 static void mcp23s08_i2c_exit(void) { }
912 #endif /* CONFIG_I2C */
914 /*----------------------------------------------------------------------*/
916 #ifdef CONFIG_SPI_MASTER
918 static int mcp23s08_probe(struct spi_device *spi)
920 struct mcp23s08_platform_data *pdata;
923 struct mcp23s08_driver_data *data;
927 pullups[ARRAY_SIZE(pdata->chip)];
928 const struct of_device_id *match;
929 u32 spi_present_mask = 0;
931 match = of_match_device(of_match_ptr(mcp23s08_spi_of_match), &spi->dev);
933 type = (int)(uintptr_t)match->data;
934 status = of_property_read_u32(spi->dev.of_node,
935 "microchip,spi-present-mask", &spi_present_mask);
937 status = of_property_read_u32(spi->dev.of_node,
938 "mcp,spi-present-mask", &spi_present_mask);
941 "DT has no spi-present-mask\n");
945 if ((spi_present_mask <= 0) || (spi_present_mask >= 256)) {
946 dev_err(&spi->dev, "invalid spi-present-mask\n");
950 for (addr = 0; addr < ARRAY_SIZE(pdata->chip); addr++) {
952 if (spi_present_mask & (1 << addr))
956 type = spi_get_device_id(spi)->driver_data;
957 pdata = dev_get_platdata(&spi->dev);
958 if (!pdata || !gpio_is_valid(pdata->base)) {
960 "invalid or missing platform data\n");
964 for (addr = 0; addr < ARRAY_SIZE(pdata->chip); addr++) {
965 if (!pdata->chip[addr].is_present)
968 if ((type == MCP_TYPE_S08) && (addr > 3)) {
970 "mcp23s08 only supports address 0..3\n");
973 spi_present_mask |= 1 << addr;
974 pullups[addr] = pdata->chip[addr].pullups;
983 data = kzalloc(sizeof(*data) + chips * sizeof(struct mcp23s08),
987 spi_set_drvdata(spi, data);
989 for (addr = 0; addr < ARRAY_SIZE(pdata->chip); addr++) {
990 if (!(spi_present_mask & (1 << addr)))
993 data->mcp[addr] = &data->chip[chips];
994 status = mcp23s08_probe_one(data->mcp[addr], &spi->dev, spi,
995 0x40 | (addr << 1), type, base,
1001 base += (type == MCP_TYPE_S17) ? 16 : 8;
1002 ngpio += (type == MCP_TYPE_S17) ? 16 : 8;
1004 data->ngpio = ngpio;
1006 /* NOTE: these chips have a relatively sane IRQ framework, with
1007 * per-signal masking and level/edge triggering. It's not yet
1014 for (addr = 0; addr < ARRAY_SIZE(data->mcp); addr++) {
1017 if (!data->mcp[addr])
1019 tmp = gpiochip_remove(&data->mcp[addr]->chip);
1021 dev_err(&spi->dev, "%s --> %d\n", "remove", tmp);
1027 static int mcp23s08_remove(struct spi_device *spi)
1029 struct mcp23s08_driver_data *data = spi_get_drvdata(spi);
1033 for (addr = 0; addr < ARRAY_SIZE(data->mcp); addr++) {
1036 if (!data->mcp[addr])
1039 tmp = gpiochip_remove(&data->mcp[addr]->chip);
1041 dev_err(&spi->dev, "%s --> %d\n", "remove", tmp);
1050 static const struct spi_device_id mcp23s08_ids[] = {
1051 { "mcp23s08", MCP_TYPE_S08 },
1052 { "mcp23s17", MCP_TYPE_S17 },
1055 MODULE_DEVICE_TABLE(spi, mcp23s08_ids);
1057 static struct spi_driver mcp23s08_driver = {
1058 .probe = mcp23s08_probe,
1059 .remove = mcp23s08_remove,
1060 .id_table = mcp23s08_ids,
1063 .owner = THIS_MODULE,
1064 .of_match_table = of_match_ptr(mcp23s08_spi_of_match),
1068 static int __init mcp23s08_spi_init(void)
1070 return spi_register_driver(&mcp23s08_driver);
1073 static void mcp23s08_spi_exit(void)
1075 spi_unregister_driver(&mcp23s08_driver);
1080 static int __init mcp23s08_spi_init(void) { return 0; }
1081 static void mcp23s08_spi_exit(void) { }
1083 #endif /* CONFIG_SPI_MASTER */
1085 /*----------------------------------------------------------------------*/
1087 static int __init mcp23s08_init(void)
1091 ret = mcp23s08_spi_init();
1095 ret = mcp23s08_i2c_init();
1102 mcp23s08_spi_exit();
1106 /* register after spi/i2c postcore initcall and before
1107 * subsys initcalls that may rely on these GPIOs
1109 subsys_initcall(mcp23s08_init);
1111 static void __exit mcp23s08_exit(void)
1113 mcp23s08_spi_exit();
1114 mcp23s08_i2c_exit();
1116 module_exit(mcp23s08_exit);
1118 MODULE_LICENSE("GPL");