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);
510 irq_set_noprobe(irq);
515 static void mcp23s08_irq_teardown(struct mcp23s08 *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 struct mcp23s08_platform_data *pdata, int cs)
589 mutex_init(&mcp->lock);
593 mcp->irq_active_high = false;
595 mcp->chip.direction_input = mcp23s08_direction_input;
596 mcp->chip.get = mcp23s08_get;
597 mcp->chip.direction_output = mcp23s08_direction_output;
598 mcp->chip.set = mcp23s08_set;
599 mcp->chip.dbg_show = mcp23s08_dbg_show;
601 mcp->chip.of_gpio_n_cells = 2;
602 mcp->chip.of_node = dev->of_node;
606 #ifdef CONFIG_SPI_MASTER
608 mcp->ops = &mcp23s08_ops;
610 mcp->chip.label = "mcp23s08";
614 mcp->ops = &mcp23s17_ops;
615 mcp->chip.ngpio = 16;
616 mcp->chip.label = "mcp23s17";
618 #endif /* CONFIG_SPI_MASTER */
620 #if IS_ENABLED(CONFIG_I2C)
622 mcp->ops = &mcp23008_ops;
624 mcp->chip.label = "mcp23008";
628 mcp->ops = &mcp23017_ops;
629 mcp->chip.ngpio = 16;
630 mcp->chip.label = "mcp23017";
632 #endif /* CONFIG_I2C */
635 dev_err(dev, "invalid device type (%d)\n", type);
639 mcp->chip.base = pdata->base;
640 mcp->chip.can_sleep = true;
642 mcp->chip.owner = THIS_MODULE;
644 /* verify MCP_IOCON.SEQOP = 0, so sequential reads work,
645 * and MCP_IOCON.HAEN = 1, so we work with all chips.
648 status = mcp->ops->read(mcp, MCP_IOCON);
652 mcp->irq_controller = pdata->irq_controller;
653 if (mcp->irq && mcp->irq_controller) {
654 mcp->irq_active_high =
655 of_property_read_bool(mcp->chip.dev->of_node,
656 "microchip,irq-active-high");
658 if (type == MCP_TYPE_017)
659 mirror = pdata->mirror;
662 if ((status & IOCON_SEQOP) || !(status & IOCON_HAEN) || mirror ||
663 mcp->irq_active_high) {
664 /* mcp23s17 has IOCON twice, make sure they are in sync */
665 status &= ~(IOCON_SEQOP | (IOCON_SEQOP << 8));
666 status |= IOCON_HAEN | (IOCON_HAEN << 8);
667 if (mcp->irq_active_high)
668 status |= IOCON_INTPOL | (IOCON_INTPOL << 8);
670 status &= ~(IOCON_INTPOL | (IOCON_INTPOL << 8));
673 status |= IOCON_MIRROR | (IOCON_MIRROR << 8);
675 status = mcp->ops->write(mcp, MCP_IOCON, status);
680 /* configure ~100K pullups */
681 status = mcp->ops->write(mcp, MCP_GPPU, pdata->chip[cs].pullups);
685 status = mcp->ops->read_regs(mcp, 0, mcp->cache, ARRAY_SIZE(mcp->cache));
689 /* disable inverter on input */
690 if (mcp->cache[MCP_IPOL] != 0) {
691 mcp->cache[MCP_IPOL] = 0;
692 status = mcp->ops->write(mcp, MCP_IPOL, 0);
698 if (mcp->cache[MCP_GPINTEN] != 0) {
699 mcp->cache[MCP_GPINTEN] = 0;
700 status = mcp->ops->write(mcp, MCP_GPINTEN, 0);
705 status = gpiochip_add(&mcp->chip);
709 if (mcp->irq && mcp->irq_controller) {
710 status = mcp23s08_irq_setup(mcp);
712 mcp23s08_irq_teardown(mcp);
718 dev_dbg(dev, "can't setup chip %d, --> %d\n",
723 /*----------------------------------------------------------------------*/
726 #ifdef CONFIG_SPI_MASTER
727 static const struct of_device_id mcp23s08_spi_of_match[] = {
729 .compatible = "microchip,mcp23s08",
730 .data = (void *) MCP_TYPE_S08,
733 .compatible = "microchip,mcp23s17",
734 .data = (void *) MCP_TYPE_S17,
736 /* NOTE: The use of the mcp prefix is deprecated and will be removed. */
738 .compatible = "mcp,mcp23s08",
739 .data = (void *) MCP_TYPE_S08,
742 .compatible = "mcp,mcp23s17",
743 .data = (void *) MCP_TYPE_S17,
747 MODULE_DEVICE_TABLE(of, mcp23s08_spi_of_match);
750 #if IS_ENABLED(CONFIG_I2C)
751 static const struct of_device_id mcp23s08_i2c_of_match[] = {
753 .compatible = "microchip,mcp23008",
754 .data = (void *) MCP_TYPE_008,
757 .compatible = "microchip,mcp23017",
758 .data = (void *) MCP_TYPE_017,
760 /* NOTE: The use of the mcp prefix is deprecated and will be removed. */
762 .compatible = "mcp,mcp23008",
763 .data = (void *) MCP_TYPE_008,
766 .compatible = "mcp,mcp23017",
767 .data = (void *) MCP_TYPE_017,
771 MODULE_DEVICE_TABLE(of, mcp23s08_i2c_of_match);
773 #endif /* CONFIG_OF */
776 #if IS_ENABLED(CONFIG_I2C)
778 static int mcp230xx_probe(struct i2c_client *client,
779 const struct i2c_device_id *id)
781 struct mcp23s08_platform_data *pdata, local_pdata;
782 struct mcp23s08 *mcp;
784 const struct of_device_id *match;
786 match = of_match_device(of_match_ptr(mcp23s08_i2c_of_match),
789 pdata = &local_pdata;
791 pdata->chip[0].pullups = 0;
792 pdata->irq_controller = of_property_read_bool(
794 "interrupt-controller");
795 pdata->mirror = of_property_read_bool(client->dev.of_node,
796 "microchip,irq-mirror");
797 client->irq = irq_of_parse_and_map(client->dev.of_node, 0);
799 pdata = dev_get_platdata(&client->dev);
801 pdata = devm_kzalloc(&client->dev,
802 sizeof(struct mcp23s08_platform_data),
808 mcp = kzalloc(sizeof(*mcp), GFP_KERNEL);
812 mcp->irq = client->irq;
813 status = mcp23s08_probe_one(mcp, &client->dev, client, client->addr,
814 id->driver_data, pdata, 0);
818 i2c_set_clientdata(client, mcp);
828 static int mcp230xx_remove(struct i2c_client *client)
830 struct mcp23s08 *mcp = i2c_get_clientdata(client);
832 if (client->irq && mcp->irq_controller)
833 mcp23s08_irq_teardown(mcp);
835 gpiochip_remove(&mcp->chip);
841 static const struct i2c_device_id mcp230xx_id[] = {
842 { "mcp23008", MCP_TYPE_008 },
843 { "mcp23017", MCP_TYPE_017 },
846 MODULE_DEVICE_TABLE(i2c, mcp230xx_id);
848 static struct i2c_driver mcp230xx_driver = {
851 .owner = THIS_MODULE,
852 .of_match_table = of_match_ptr(mcp23s08_i2c_of_match),
854 .probe = mcp230xx_probe,
855 .remove = mcp230xx_remove,
856 .id_table = mcp230xx_id,
859 static int __init mcp23s08_i2c_init(void)
861 return i2c_add_driver(&mcp230xx_driver);
864 static void mcp23s08_i2c_exit(void)
866 i2c_del_driver(&mcp230xx_driver);
871 static int __init mcp23s08_i2c_init(void) { return 0; }
872 static void mcp23s08_i2c_exit(void) { }
874 #endif /* CONFIG_I2C */
876 /*----------------------------------------------------------------------*/
878 #ifdef CONFIG_SPI_MASTER
880 static int mcp23s08_probe(struct spi_device *spi)
882 struct mcp23s08_platform_data *pdata, local_pdata;
885 struct mcp23s08_driver_data *data;
888 const struct of_device_id *match;
889 u32 spi_present_mask = 0;
891 match = of_match_device(of_match_ptr(mcp23s08_spi_of_match), &spi->dev);
893 type = (int)(uintptr_t)match->data;
894 status = of_property_read_u32(spi->dev.of_node,
895 "microchip,spi-present-mask", &spi_present_mask);
897 status = of_property_read_u32(spi->dev.of_node,
898 "mcp,spi-present-mask", &spi_present_mask);
901 "DT has no spi-present-mask\n");
905 if ((spi_present_mask <= 0) || (spi_present_mask >= 256)) {
906 dev_err(&spi->dev, "invalid spi-present-mask\n");
910 pdata = &local_pdata;
912 for (addr = 0; addr < ARRAY_SIZE(pdata->chip); addr++) {
913 pdata->chip[addr].pullups = 0;
914 if (spi_present_mask & (1 << addr))
917 pdata->irq_controller = of_property_read_bool(
919 "interrupt-controller");
920 pdata->mirror = of_property_read_bool(spi->dev.of_node,
921 "microchip,irq-mirror");
923 type = spi_get_device_id(spi)->driver_data;
924 pdata = dev_get_platdata(&spi->dev);
926 pdata = devm_kzalloc(&spi->dev,
927 sizeof(struct mcp23s08_platform_data),
932 for (addr = 0; addr < ARRAY_SIZE(pdata->chip); addr++) {
933 if (!pdata->chip[addr].is_present)
936 if ((type == MCP_TYPE_S08) && (addr > 3)) {
938 "mcp23s08 only supports address 0..3\n");
941 spi_present_mask |= 1 << addr;
948 data = devm_kzalloc(&spi->dev,
949 sizeof(*data) + chips * sizeof(struct mcp23s08),
954 spi_set_drvdata(spi, data);
956 spi->irq = irq_of_parse_and_map(spi->dev.of_node, 0);
958 for (addr = 0; addr < ARRAY_SIZE(pdata->chip); addr++) {
959 if (!(spi_present_mask & (1 << addr)))
962 data->mcp[addr] = &data->chip[chips];
963 data->mcp[addr]->irq = spi->irq;
964 status = mcp23s08_probe_one(data->mcp[addr], &spi->dev, spi,
965 0x40 | (addr << 1), type, pdata,
970 if (pdata->base != -1)
971 pdata->base += (type == MCP_TYPE_S17) ? 16 : 8;
972 ngpio += (type == MCP_TYPE_S17) ? 16 : 8;
976 /* NOTE: these chips have a relatively sane IRQ framework, with
977 * per-signal masking and level/edge triggering. It's not yet
984 for (addr = 0; addr < ARRAY_SIZE(data->mcp); addr++) {
986 if (!data->mcp[addr])
988 gpiochip_remove(&data->mcp[addr]->chip);
993 static int mcp23s08_remove(struct spi_device *spi)
995 struct mcp23s08_driver_data *data = spi_get_drvdata(spi);
998 for (addr = 0; addr < ARRAY_SIZE(data->mcp); addr++) {
1000 if (!data->mcp[addr])
1003 if (spi->irq && data->mcp[addr]->irq_controller)
1004 mcp23s08_irq_teardown(data->mcp[addr]);
1005 gpiochip_remove(&data->mcp[addr]->chip);
1011 static const struct spi_device_id mcp23s08_ids[] = {
1012 { "mcp23s08", MCP_TYPE_S08 },
1013 { "mcp23s17", MCP_TYPE_S17 },
1016 MODULE_DEVICE_TABLE(spi, mcp23s08_ids);
1018 static struct spi_driver mcp23s08_driver = {
1019 .probe = mcp23s08_probe,
1020 .remove = mcp23s08_remove,
1021 .id_table = mcp23s08_ids,
1024 .owner = THIS_MODULE,
1025 .of_match_table = of_match_ptr(mcp23s08_spi_of_match),
1029 static int __init mcp23s08_spi_init(void)
1031 return spi_register_driver(&mcp23s08_driver);
1034 static void mcp23s08_spi_exit(void)
1036 spi_unregister_driver(&mcp23s08_driver);
1041 static int __init mcp23s08_spi_init(void) { return 0; }
1042 static void mcp23s08_spi_exit(void) { }
1044 #endif /* CONFIG_SPI_MASTER */
1046 /*----------------------------------------------------------------------*/
1048 static int __init mcp23s08_init(void)
1052 ret = mcp23s08_spi_init();
1056 ret = mcp23s08_i2c_init();
1063 mcp23s08_spi_exit();
1067 /* register after spi/i2c postcore initcall and before
1068 * subsys initcalls that may rely on these GPIOs
1070 subsys_initcall(mcp23s08_init);
1072 static void __exit mcp23s08_exit(void)
1074 mcp23s08_spi_exit();
1075 mcp23s08_i2c_exit();
1077 module_exit(mcp23s08_exit);
1079 MODULE_LICENSE("GPL");