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;
344 unsigned int child_irq;
346 mutex_lock(&mcp->lock);
347 intf = mcp->ops->read(mcp, MCP_INTF);
349 mutex_unlock(&mcp->lock);
353 mcp->cache[MCP_INTF] = intf;
355 intcap = mcp->ops->read(mcp, MCP_INTCAP);
357 mutex_unlock(&mcp->lock);
361 mcp->cache[MCP_INTCAP] = intcap;
362 mutex_unlock(&mcp->lock);
365 for (i = 0; i < mcp->chip.ngpio; i++) {
366 if ((BIT(i) & mcp->cache[MCP_INTF]) &&
367 ((BIT(i) & intcap & mcp->irq_rise) ||
368 (mcp->irq_fall & ~intcap & BIT(i)))) {
369 child_irq = irq_find_mapping(mcp->irq_domain, i);
370 handle_nested_irq(child_irq);
377 static int mcp23s08_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
379 struct mcp23s08 *mcp = container_of(chip, struct mcp23s08, chip);
381 return irq_find_mapping(mcp->irq_domain, offset);
384 static void mcp23s08_irq_mask(struct irq_data *data)
386 struct mcp23s08 *mcp = irq_data_get_irq_chip_data(data);
387 unsigned int pos = data->hwirq;
389 mcp->cache[MCP_GPINTEN] &= ~BIT(pos);
392 static void mcp23s08_irq_unmask(struct irq_data *data)
394 struct mcp23s08 *mcp = irq_data_get_irq_chip_data(data);
395 unsigned int pos = data->hwirq;
397 mcp->cache[MCP_GPINTEN] |= BIT(pos);
400 static int mcp23s08_irq_set_type(struct irq_data *data, unsigned int type)
402 struct mcp23s08 *mcp = irq_data_get_irq_chip_data(data);
403 unsigned int pos = data->hwirq;
406 if ((type & IRQ_TYPE_EDGE_BOTH) == IRQ_TYPE_EDGE_BOTH) {
407 mcp->cache[MCP_INTCON] &= ~BIT(pos);
408 mcp->irq_rise |= BIT(pos);
409 mcp->irq_fall |= BIT(pos);
410 } else if (type & IRQ_TYPE_EDGE_RISING) {
411 mcp->cache[MCP_INTCON] &= ~BIT(pos);
412 mcp->irq_rise |= BIT(pos);
413 mcp->irq_fall &= ~BIT(pos);
414 } else if (type & IRQ_TYPE_EDGE_FALLING) {
415 mcp->cache[MCP_INTCON] &= ~BIT(pos);
416 mcp->irq_rise &= ~BIT(pos);
417 mcp->irq_fall |= BIT(pos);
424 static void mcp23s08_irq_bus_lock(struct irq_data *data)
426 struct mcp23s08 *mcp = irq_data_get_irq_chip_data(data);
428 mutex_lock(&mcp->irq_lock);
431 static void mcp23s08_irq_bus_unlock(struct irq_data *data)
433 struct mcp23s08 *mcp = irq_data_get_irq_chip_data(data);
435 mutex_lock(&mcp->lock);
436 mcp->ops->write(mcp, MCP_GPINTEN, mcp->cache[MCP_GPINTEN]);
437 mcp->ops->write(mcp, MCP_DEFVAL, mcp->cache[MCP_DEFVAL]);
438 mcp->ops->write(mcp, MCP_INTCON, mcp->cache[MCP_INTCON]);
439 mutex_unlock(&mcp->lock);
440 mutex_unlock(&mcp->irq_lock);
443 static unsigned int mcp23s08_irq_startup(struct irq_data *data)
445 struct mcp23s08 *mcp = irq_data_get_irq_chip_data(data);
447 if (gpio_lock_as_irq(&mcp->chip, data->hwirq))
448 dev_err(mcp->chip.dev,
449 "unable to lock HW IRQ %lu for IRQ usage\n",
452 mcp23s08_irq_unmask(data);
456 static void mcp23s08_irq_shutdown(struct irq_data *data)
458 struct mcp23s08 *mcp = irq_data_get_irq_chip_data(data);
460 mcp23s08_irq_mask(data);
461 gpio_unlock_as_irq(&mcp->chip, data->hwirq);
464 static struct irq_chip mcp23s08_irq_chip = {
465 .name = "gpio-mcp23xxx",
466 .irq_mask = mcp23s08_irq_mask,
467 .irq_unmask = mcp23s08_irq_unmask,
468 .irq_set_type = mcp23s08_irq_set_type,
469 .irq_bus_lock = mcp23s08_irq_bus_lock,
470 .irq_bus_sync_unlock = mcp23s08_irq_bus_unlock,
471 .irq_startup = mcp23s08_irq_startup,
472 .irq_shutdown = mcp23s08_irq_shutdown,
475 static int mcp23s08_irq_setup(struct mcp23s08 *mcp)
477 struct gpio_chip *chip = &mcp->chip;
480 mutex_init(&mcp->irq_lock);
482 mcp->irq_domain = irq_domain_add_linear(chip->of_node, chip->ngpio,
483 &irq_domain_simple_ops, mcp);
484 if (!mcp->irq_domain)
487 err = devm_request_threaded_irq(chip->dev, mcp->irq, NULL, mcp23s08_irq,
488 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
489 dev_name(chip->dev), mcp);
491 dev_err(chip->dev, "unable to request IRQ#%d: %d\n",
496 chip->to_irq = mcp23s08_gpio_to_irq;
498 for (j = 0; j < mcp->chip.ngpio; j++) {
499 irq = irq_create_mapping(mcp->irq_domain, j);
500 irq_set_lockdep_class(irq, &gpio_lock_class);
501 irq_set_chip_data(irq, mcp);
502 irq_set_chip(irq, &mcp23s08_irq_chip);
503 irq_set_nested_thread(irq, true);
505 set_irq_flags(irq, IRQF_VALID);
507 irq_set_noprobe(irq);
513 static void mcp23s08_irq_teardown(struct mcp23s08 *mcp)
517 free_irq(mcp->irq, mcp);
519 for (i = 0; i < mcp->chip.ngpio; i++) {
520 irq = irq_find_mapping(mcp->irq_domain, i);
522 irq_dispose_mapping(irq);
525 irq_domain_remove(mcp->irq_domain);
528 /*----------------------------------------------------------------------*/
530 #ifdef CONFIG_DEBUG_FS
532 #include <linux/seq_file.h>
535 * This shows more info than the generic gpio dump code:
536 * pullups, deglitching, open drain drive.
538 static void mcp23s08_dbg_show(struct seq_file *s, struct gpio_chip *chip)
540 struct mcp23s08 *mcp;
545 mcp = container_of(chip, struct mcp23s08, chip);
547 /* NOTE: we only handle one bank for now ... */
548 bank = '0' + ((mcp->addr >> 1) & 0x7);
550 mutex_lock(&mcp->lock);
551 t = mcp->ops->read_regs(mcp, 0, mcp->cache, ARRAY_SIZE(mcp->cache));
553 seq_printf(s, " I/O ERROR %d\n", t);
557 for (t = 0, mask = 1; t < chip->ngpio; t++, mask <<= 1) {
560 label = gpiochip_is_requested(chip, t);
564 seq_printf(s, " gpio-%-3d P%c.%d (%-12s) %s %s %s",
565 chip->base + t, bank, t, label,
566 (mcp->cache[MCP_IODIR] & mask) ? "in " : "out",
567 (mcp->cache[MCP_GPIO] & mask) ? "hi" : "lo",
568 (mcp->cache[MCP_GPPU] & mask) ? "up" : " ");
569 /* NOTE: ignoring the irq-related registers */
573 mutex_unlock(&mcp->lock);
577 #define mcp23s08_dbg_show NULL
580 /*----------------------------------------------------------------------*/
582 static int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev,
583 void *data, unsigned addr, unsigned type,
584 unsigned base, unsigned pullups)
589 mutex_init(&mcp->lock);
594 mcp->chip.direction_input = mcp23s08_direction_input;
595 mcp->chip.get = mcp23s08_get;
596 mcp->chip.direction_output = mcp23s08_direction_output;
597 mcp->chip.set = mcp23s08_set;
598 mcp->chip.dbg_show = mcp23s08_dbg_show;
600 mcp->chip.of_gpio_n_cells = 2;
601 mcp->chip.of_node = dev->of_node;
605 #ifdef CONFIG_SPI_MASTER
607 mcp->ops = &mcp23s08_ops;
609 mcp->chip.label = "mcp23s08";
613 mcp->ops = &mcp23s17_ops;
614 mcp->chip.ngpio = 16;
615 mcp->chip.label = "mcp23s17";
617 #endif /* CONFIG_SPI_MASTER */
619 #if IS_ENABLED(CONFIG_I2C)
621 mcp->ops = &mcp23008_ops;
623 mcp->chip.label = "mcp23008";
627 mcp->ops = &mcp23017_ops;
628 mcp->chip.ngpio = 16;
629 mcp->chip.label = "mcp23017";
631 #endif /* CONFIG_I2C */
634 dev_err(dev, "invalid device type (%d)\n", type);
638 mcp->chip.base = base;
639 mcp->chip.can_sleep = true;
641 mcp->chip.owner = THIS_MODULE;
643 /* verify MCP_IOCON.SEQOP = 0, so sequential reads work,
644 * and MCP_IOCON.HAEN = 1, so we work with all chips.
647 status = mcp->ops->read(mcp, MCP_IOCON);
651 mcp->irq_controller = of_property_read_bool(mcp->chip.of_node,
652 "interrupt-controller");
653 if (mcp->irq && mcp->irq_controller && (type == MCP_TYPE_017))
654 mirror = of_property_read_bool(mcp->chip.of_node,
655 "microchip,irq-mirror");
657 if ((status & IOCON_SEQOP) || !(status & IOCON_HAEN) || mirror) {
658 /* mcp23s17 has IOCON twice, make sure they are in sync */
659 status &= ~(IOCON_SEQOP | (IOCON_SEQOP << 8));
660 status |= IOCON_HAEN | (IOCON_HAEN << 8);
661 status &= ~(IOCON_INTPOL | (IOCON_INTPOL << 8));
663 status |= IOCON_MIRROR | (IOCON_MIRROR << 8);
665 status = mcp->ops->write(mcp, MCP_IOCON, status);
670 /* configure ~100K pullups */
671 status = mcp->ops->write(mcp, MCP_GPPU, pullups);
675 status = mcp->ops->read_regs(mcp, 0, mcp->cache, ARRAY_SIZE(mcp->cache));
679 /* disable inverter on input */
680 if (mcp->cache[MCP_IPOL] != 0) {
681 mcp->cache[MCP_IPOL] = 0;
682 status = mcp->ops->write(mcp, MCP_IPOL, 0);
688 if (mcp->cache[MCP_GPINTEN] != 0) {
689 mcp->cache[MCP_GPINTEN] = 0;
690 status = mcp->ops->write(mcp, MCP_GPINTEN, 0);
695 status = gpiochip_add(&mcp->chip);
699 if (mcp->irq && mcp->irq_controller) {
700 status = mcp23s08_irq_setup(mcp);
702 mcp23s08_irq_teardown(mcp);
708 dev_dbg(dev, "can't setup chip %d, --> %d\n",
713 /*----------------------------------------------------------------------*/
716 #ifdef CONFIG_SPI_MASTER
717 static struct of_device_id mcp23s08_spi_of_match[] = {
719 .compatible = "microchip,mcp23s08",
720 .data = (void *) MCP_TYPE_S08,
723 .compatible = "microchip,mcp23s17",
724 .data = (void *) MCP_TYPE_S17,
726 /* NOTE: The use of the mcp prefix is deprecated and will be removed. */
728 .compatible = "mcp,mcp23s08",
729 .data = (void *) MCP_TYPE_S08,
732 .compatible = "mcp,mcp23s17",
733 .data = (void *) MCP_TYPE_S17,
737 MODULE_DEVICE_TABLE(of, mcp23s08_spi_of_match);
740 #if IS_ENABLED(CONFIG_I2C)
741 static struct of_device_id mcp23s08_i2c_of_match[] = {
743 .compatible = "microchip,mcp23008",
744 .data = (void *) MCP_TYPE_008,
747 .compatible = "microchip,mcp23017",
748 .data = (void *) MCP_TYPE_017,
750 /* NOTE: The use of the mcp prefix is deprecated and will be removed. */
752 .compatible = "mcp,mcp23008",
753 .data = (void *) MCP_TYPE_008,
756 .compatible = "mcp,mcp23017",
757 .data = (void *) MCP_TYPE_017,
761 MODULE_DEVICE_TABLE(of, mcp23s08_i2c_of_match);
763 #endif /* CONFIG_OF */
766 #if IS_ENABLED(CONFIG_I2C)
768 static int mcp230xx_probe(struct i2c_client *client,
769 const struct i2c_device_id *id)
771 struct mcp23s08_platform_data *pdata;
772 struct mcp23s08 *mcp;
773 int status, base, pullups;
774 const struct of_device_id *match;
776 match = of_match_device(of_match_ptr(mcp23s08_i2c_of_match),
778 pdata = dev_get_platdata(&client->dev);
779 if (match || !pdata) {
782 client->irq = irq_of_parse_and_map(client->dev.of_node, 0);
784 if (!gpio_is_valid(pdata->base)) {
785 dev_dbg(&client->dev, "invalid platform data\n");
789 pullups = pdata->chip[0].pullups;
792 mcp = kzalloc(sizeof *mcp, GFP_KERNEL);
796 mcp->irq = client->irq;
797 status = mcp23s08_probe_one(mcp, &client->dev, client, client->addr,
798 id->driver_data, base, pullups);
802 i2c_set_clientdata(client, mcp);
812 static int mcp230xx_remove(struct i2c_client *client)
814 struct mcp23s08 *mcp = i2c_get_clientdata(client);
817 if (client->irq && mcp->irq_controller)
818 mcp23s08_irq_teardown(mcp);
820 status = gpiochip_remove(&mcp->chip);
827 static const struct i2c_device_id mcp230xx_id[] = {
828 { "mcp23008", MCP_TYPE_008 },
829 { "mcp23017", MCP_TYPE_017 },
832 MODULE_DEVICE_TABLE(i2c, mcp230xx_id);
834 static struct i2c_driver mcp230xx_driver = {
837 .owner = THIS_MODULE,
838 .of_match_table = of_match_ptr(mcp23s08_i2c_of_match),
840 .probe = mcp230xx_probe,
841 .remove = mcp230xx_remove,
842 .id_table = mcp230xx_id,
845 static int __init mcp23s08_i2c_init(void)
847 return i2c_add_driver(&mcp230xx_driver);
850 static void mcp23s08_i2c_exit(void)
852 i2c_del_driver(&mcp230xx_driver);
857 static int __init mcp23s08_i2c_init(void) { return 0; }
858 static void mcp23s08_i2c_exit(void) { }
860 #endif /* CONFIG_I2C */
862 /*----------------------------------------------------------------------*/
864 #ifdef CONFIG_SPI_MASTER
866 static int mcp23s08_probe(struct spi_device *spi)
868 struct mcp23s08_platform_data *pdata;
871 struct mcp23s08_driver_data *data;
875 pullups[ARRAY_SIZE(pdata->chip)];
876 const struct of_device_id *match;
877 u32 spi_present_mask = 0;
879 match = of_match_device(of_match_ptr(mcp23s08_spi_of_match), &spi->dev);
881 type = (int)(uintptr_t)match->data;
882 status = of_property_read_u32(spi->dev.of_node,
883 "microchip,spi-present-mask", &spi_present_mask);
885 status = of_property_read_u32(spi->dev.of_node,
886 "mcp,spi-present-mask", &spi_present_mask);
889 "DT has no spi-present-mask\n");
893 if ((spi_present_mask <= 0) || (spi_present_mask >= 256)) {
894 dev_err(&spi->dev, "invalid spi-present-mask\n");
898 for (addr = 0; addr < ARRAY_SIZE(pdata->chip); addr++)
901 type = spi_get_device_id(spi)->driver_data;
902 pdata = dev_get_platdata(&spi->dev);
903 if (!pdata || !gpio_is_valid(pdata->base)) {
905 "invalid or missing platform data\n");
909 for (addr = 0; addr < ARRAY_SIZE(pdata->chip); addr++) {
910 if (!pdata->chip[addr].is_present)
913 if ((type == MCP_TYPE_S08) && (addr > 3)) {
915 "mcp23s08 only supports address 0..3\n");
918 spi_present_mask |= 1 << addr;
919 pullups[addr] = pdata->chip[addr].pullups;
928 data = kzalloc(sizeof *data + chips * sizeof(struct mcp23s08),
932 spi_set_drvdata(spi, data);
934 for (addr = 0; addr < ARRAY_SIZE(pdata->chip); addr++) {
935 if (!(spi_present_mask & (1 << addr)))
938 data->mcp[addr] = &data->chip[chips];
939 status = mcp23s08_probe_one(data->mcp[addr], &spi->dev, spi,
940 0x40 | (addr << 1), type, base,
946 base += (type == MCP_TYPE_S17) ? 16 : 8;
947 ngpio += (type == MCP_TYPE_S17) ? 16 : 8;
951 /* NOTE: these chips have a relatively sane IRQ framework, with
952 * per-signal masking and level/edge triggering. It's not yet
959 for (addr = 0; addr < ARRAY_SIZE(data->mcp); addr++) {
962 if (!data->mcp[addr])
964 tmp = gpiochip_remove(&data->mcp[addr]->chip);
966 dev_err(&spi->dev, "%s --> %d\n", "remove", tmp);
972 static int mcp23s08_remove(struct spi_device *spi)
974 struct mcp23s08_driver_data *data = spi_get_drvdata(spi);
978 for (addr = 0; addr < ARRAY_SIZE(data->mcp); addr++) {
981 if (!data->mcp[addr])
984 tmp = gpiochip_remove(&data->mcp[addr]->chip);
986 dev_err(&spi->dev, "%s --> %d\n", "remove", tmp);
995 static const struct spi_device_id mcp23s08_ids[] = {
996 { "mcp23s08", MCP_TYPE_S08 },
997 { "mcp23s17", MCP_TYPE_S17 },
1000 MODULE_DEVICE_TABLE(spi, mcp23s08_ids);
1002 static struct spi_driver mcp23s08_driver = {
1003 .probe = mcp23s08_probe,
1004 .remove = mcp23s08_remove,
1005 .id_table = mcp23s08_ids,
1008 .owner = THIS_MODULE,
1009 .of_match_table = of_match_ptr(mcp23s08_spi_of_match),
1013 static int __init mcp23s08_spi_init(void)
1015 return spi_register_driver(&mcp23s08_driver);
1018 static void mcp23s08_spi_exit(void)
1020 spi_unregister_driver(&mcp23s08_driver);
1025 static int __init mcp23s08_spi_init(void) { return 0; }
1026 static void mcp23s08_spi_exit(void) { }
1028 #endif /* CONFIG_SPI_MASTER */
1030 /*----------------------------------------------------------------------*/
1032 static int __init mcp23s08_init(void)
1036 ret = mcp23s08_spi_init();
1040 ret = mcp23s08_i2c_init();
1047 mcp23s08_spi_exit();
1051 /* register after spi/i2c postcore initcall and before
1052 * subsys initcalls that may rely on these GPIOs
1054 subsys_initcall(mcp23s08_init);
1056 static void __exit mcp23s08_exit(void)
1058 mcp23s08_spi_exit();
1059 mcp23s08_i2c_exit();
1061 module_exit(mcp23s08_exit);
1063 MODULE_LICENSE("GPL");