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
34 #define MCP_TYPE_S18 4
36 /* Registers are all 8 bits wide.
38 * The mcp23s17 has twice as many bits, and can be configured to work
39 * with either 16 bit registers or with two adjacent 8 bit banks.
41 #define MCP_IODIR 0x00 /* init/reset: all ones */
43 #define MCP_GPINTEN 0x02
44 #define MCP_DEFVAL 0x03
45 #define MCP_INTCON 0x04
46 #define MCP_IOCON 0x05
47 # define IOCON_MIRROR (1 << 6)
48 # define IOCON_SEQOP (1 << 5)
49 # define IOCON_HAEN (1 << 3)
50 # define IOCON_ODR (1 << 2)
51 # define IOCON_INTPOL (1 << 1)
52 # define IOCON_INTCC (1)
55 #define MCP_INTCAP 0x08
62 int (*read)(struct mcp23s08 *mcp, unsigned reg);
63 int (*write)(struct mcp23s08 *mcp, unsigned reg, unsigned val);
64 int (*read_regs)(struct mcp23s08 *mcp, unsigned reg,
65 u16 *vals, unsigned n);
77 /* lock protects the cached values */
79 struct mutex irq_lock;
81 struct gpio_chip chip;
83 const struct mcp23s08_ops *ops;
84 void *data; /* ops specific data */
87 /* A given spi_device can represent up to eight mcp23sxx chips
88 * sharing the same chipselect but using different addresses
89 * (e.g. chips #0 and #3 might be populated, but not #1 or $2).
90 * Driver data holds all the per-chip data.
92 struct mcp23s08_driver_data {
94 struct mcp23s08 *mcp[8];
95 struct mcp23s08 chip[];
98 /*----------------------------------------------------------------------*/
100 #if IS_ENABLED(CONFIG_I2C)
102 static int mcp23008_read(struct mcp23s08 *mcp, unsigned reg)
104 return i2c_smbus_read_byte_data(mcp->data, reg);
107 static int mcp23008_write(struct mcp23s08 *mcp, unsigned reg, unsigned val)
109 return i2c_smbus_write_byte_data(mcp->data, reg, val);
113 mcp23008_read_regs(struct mcp23s08 *mcp, unsigned reg, u16 *vals, unsigned n)
116 int ret = mcp23008_read(mcp, reg++);
125 static int mcp23017_read(struct mcp23s08 *mcp, unsigned reg)
127 return i2c_smbus_read_word_data(mcp->data, reg << 1);
130 static int mcp23017_write(struct mcp23s08 *mcp, unsigned reg, unsigned val)
132 return i2c_smbus_write_word_data(mcp->data, reg << 1, val);
136 mcp23017_read_regs(struct mcp23s08 *mcp, unsigned reg, u16 *vals, unsigned n)
139 int ret = mcp23017_read(mcp, reg++);
148 static const struct mcp23s08_ops mcp23008_ops = {
149 .read = mcp23008_read,
150 .write = mcp23008_write,
151 .read_regs = mcp23008_read_regs,
154 static const struct mcp23s08_ops mcp23017_ops = {
155 .read = mcp23017_read,
156 .write = mcp23017_write,
157 .read_regs = mcp23017_read_regs,
160 #endif /* CONFIG_I2C */
162 /*----------------------------------------------------------------------*/
164 #ifdef CONFIG_SPI_MASTER
166 static int mcp23s08_read(struct mcp23s08 *mcp, unsigned reg)
171 tx[0] = mcp->addr | 0x01;
173 status = spi_write_then_read(mcp->data, tx, sizeof(tx), rx, sizeof(rx));
174 return (status < 0) ? status : rx[0];
177 static int mcp23s08_write(struct mcp23s08 *mcp, unsigned reg, unsigned val)
184 return spi_write_then_read(mcp->data, tx, sizeof(tx), NULL, 0);
188 mcp23s08_read_regs(struct mcp23s08 *mcp, unsigned reg, u16 *vals, unsigned n)
193 if ((n + reg) > sizeof(mcp->cache))
195 tx[0] = mcp->addr | 0x01;
199 status = spi_write_then_read(mcp->data, tx, sizeof(tx), tmp, n);
202 vals[n] = tmp[n]; /* expand to 16bit */
207 static int mcp23s17_read(struct mcp23s08 *mcp, unsigned reg)
212 tx[0] = mcp->addr | 0x01;
214 status = spi_write_then_read(mcp->data, tx, sizeof(tx), rx, sizeof(rx));
215 return (status < 0) ? status : (rx[0] | (rx[1] << 8));
218 static int mcp23s17_write(struct mcp23s08 *mcp, unsigned reg, unsigned val)
226 return spi_write_then_read(mcp->data, tx, sizeof(tx), NULL, 0);
230 mcp23s17_read_regs(struct mcp23s08 *mcp, unsigned reg, u16 *vals, unsigned n)
235 if ((n + reg) > sizeof(mcp->cache))
237 tx[0] = mcp->addr | 0x01;
240 status = spi_write_then_read(mcp->data, tx, sizeof(tx),
244 vals[n] = __le16_to_cpu((__le16)vals[n]);
250 static const struct mcp23s08_ops mcp23s08_ops = {
251 .read = mcp23s08_read,
252 .write = mcp23s08_write,
253 .read_regs = mcp23s08_read_regs,
256 static const struct mcp23s08_ops mcp23s17_ops = {
257 .read = mcp23s17_read,
258 .write = mcp23s17_write,
259 .read_regs = mcp23s17_read_regs,
262 #endif /* CONFIG_SPI_MASTER */
264 /*----------------------------------------------------------------------*/
266 static int mcp23s08_direction_input(struct gpio_chip *chip, unsigned offset)
268 struct mcp23s08 *mcp = gpiochip_get_data(chip);
271 mutex_lock(&mcp->lock);
272 mcp->cache[MCP_IODIR] |= (1 << offset);
273 status = mcp->ops->write(mcp, MCP_IODIR, mcp->cache[MCP_IODIR]);
274 mutex_unlock(&mcp->lock);
278 static int mcp23s08_get(struct gpio_chip *chip, unsigned offset)
280 struct mcp23s08 *mcp = gpiochip_get_data(chip);
283 mutex_lock(&mcp->lock);
285 /* REVISIT reading this clears any IRQ ... */
286 status = mcp->ops->read(mcp, MCP_GPIO);
290 mcp->cache[MCP_GPIO] = status;
291 status = !!(status & (1 << offset));
293 mutex_unlock(&mcp->lock);
297 static int __mcp23s08_set(struct mcp23s08 *mcp, unsigned mask, int value)
299 unsigned olat = mcp->cache[MCP_OLAT];
305 mcp->cache[MCP_OLAT] = olat;
306 return mcp->ops->write(mcp, MCP_OLAT, olat);
309 static void mcp23s08_set(struct gpio_chip *chip, unsigned offset, int value)
311 struct mcp23s08 *mcp = gpiochip_get_data(chip);
312 unsigned mask = 1 << offset;
314 mutex_lock(&mcp->lock);
315 __mcp23s08_set(mcp, mask, value);
316 mutex_unlock(&mcp->lock);
320 mcp23s08_direction_output(struct gpio_chip *chip, unsigned offset, int value)
322 struct mcp23s08 *mcp = gpiochip_get_data(chip);
323 unsigned mask = 1 << offset;
326 mutex_lock(&mcp->lock);
327 status = __mcp23s08_set(mcp, mask, value);
329 mcp->cache[MCP_IODIR] &= ~mask;
330 status = mcp->ops->write(mcp, MCP_IODIR, mcp->cache[MCP_IODIR]);
332 mutex_unlock(&mcp->lock);
336 /*----------------------------------------------------------------------*/
337 static irqreturn_t mcp23s08_irq(int irq, void *data)
339 struct mcp23s08 *mcp = data;
341 unsigned int child_irq;
343 mutex_lock(&mcp->lock);
344 intf = mcp->ops->read(mcp, MCP_INTF);
346 mutex_unlock(&mcp->lock);
350 mcp->cache[MCP_INTF] = intf;
352 intcap = mcp->ops->read(mcp, MCP_INTCAP);
354 mutex_unlock(&mcp->lock);
358 mcp->cache[MCP_INTCAP] = intcap;
359 mutex_unlock(&mcp->lock);
362 for (i = 0; i < mcp->chip.ngpio; i++) {
363 if ((BIT(i) & mcp->cache[MCP_INTF]) &&
364 ((BIT(i) & intcap & mcp->irq_rise) ||
365 (mcp->irq_fall & ~intcap & BIT(i)) ||
366 (BIT(i) & mcp->cache[MCP_INTCON]))) {
367 child_irq = irq_find_mapping(mcp->chip.irqdomain, i);
368 handle_nested_irq(child_irq);
375 static void mcp23s08_irq_mask(struct irq_data *data)
377 struct gpio_chip *gc = irq_data_get_irq_chip_data(data);
378 struct mcp23s08 *mcp = gpiochip_get_data(gc);
379 unsigned int pos = data->hwirq;
381 mcp->cache[MCP_GPINTEN] &= ~BIT(pos);
384 static void mcp23s08_irq_unmask(struct irq_data *data)
386 struct gpio_chip *gc = irq_data_get_irq_chip_data(data);
387 struct mcp23s08 *mcp = gpiochip_get_data(gc);
388 unsigned int pos = data->hwirq;
390 mcp->cache[MCP_GPINTEN] |= BIT(pos);
393 static int mcp23s08_irq_set_type(struct irq_data *data, unsigned int type)
395 struct gpio_chip *gc = irq_data_get_irq_chip_data(data);
396 struct mcp23s08 *mcp = gpiochip_get_data(gc);
397 unsigned int pos = data->hwirq;
400 if ((type & IRQ_TYPE_EDGE_BOTH) == IRQ_TYPE_EDGE_BOTH) {
401 mcp->cache[MCP_INTCON] &= ~BIT(pos);
402 mcp->irq_rise |= BIT(pos);
403 mcp->irq_fall |= BIT(pos);
404 } else if (type & IRQ_TYPE_EDGE_RISING) {
405 mcp->cache[MCP_INTCON] &= ~BIT(pos);
406 mcp->irq_rise |= BIT(pos);
407 mcp->irq_fall &= ~BIT(pos);
408 } else if (type & IRQ_TYPE_EDGE_FALLING) {
409 mcp->cache[MCP_INTCON] &= ~BIT(pos);
410 mcp->irq_rise &= ~BIT(pos);
411 mcp->irq_fall |= BIT(pos);
412 } else if (type & IRQ_TYPE_LEVEL_HIGH) {
413 mcp->cache[MCP_INTCON] |= BIT(pos);
414 mcp->cache[MCP_DEFVAL] &= ~BIT(pos);
415 } else if (type & IRQ_TYPE_LEVEL_LOW) {
416 mcp->cache[MCP_INTCON] |= BIT(pos);
417 mcp->cache[MCP_DEFVAL] |= BIT(pos);
424 static void mcp23s08_irq_bus_lock(struct irq_data *data)
426 struct gpio_chip *gc = irq_data_get_irq_chip_data(data);
427 struct mcp23s08 *mcp = gpiochip_get_data(gc);
429 mutex_lock(&mcp->irq_lock);
432 static void mcp23s08_irq_bus_unlock(struct irq_data *data)
434 struct gpio_chip *gc = irq_data_get_irq_chip_data(data);
435 struct mcp23s08 *mcp = gpiochip_get_data(gc);
437 mutex_lock(&mcp->lock);
438 mcp->ops->write(mcp, MCP_GPINTEN, mcp->cache[MCP_GPINTEN]);
439 mcp->ops->write(mcp, MCP_DEFVAL, mcp->cache[MCP_DEFVAL]);
440 mcp->ops->write(mcp, MCP_INTCON, mcp->cache[MCP_INTCON]);
441 mutex_unlock(&mcp->lock);
442 mutex_unlock(&mcp->irq_lock);
445 static struct irq_chip mcp23s08_irq_chip = {
446 .name = "gpio-mcp23xxx",
447 .irq_mask = mcp23s08_irq_mask,
448 .irq_unmask = mcp23s08_irq_unmask,
449 .irq_set_type = mcp23s08_irq_set_type,
450 .irq_bus_lock = mcp23s08_irq_bus_lock,
451 .irq_bus_sync_unlock = mcp23s08_irq_bus_unlock,
454 static int mcp23s08_irq_setup(struct mcp23s08 *mcp)
456 struct gpio_chip *chip = &mcp->chip;
458 unsigned long irqflags = IRQF_ONESHOT | IRQF_SHARED;
460 mutex_init(&mcp->irq_lock);
462 if (mcp->irq_active_high)
463 irqflags |= IRQF_TRIGGER_HIGH;
465 irqflags |= IRQF_TRIGGER_LOW;
467 err = devm_request_threaded_irq(chip->parent, mcp->irq, NULL,
469 irqflags, dev_name(chip->parent), mcp);
471 dev_err(chip->parent, "unable to request IRQ#%d: %d\n",
476 err = gpiochip_irqchip_add(chip,
482 dev_err(chip->parent,
483 "could not connect irqchip to gpiochip: %d\n", err);
487 gpiochip_set_chained_irqchip(chip,
495 /*----------------------------------------------------------------------*/
497 #ifdef CONFIG_DEBUG_FS
499 #include <linux/seq_file.h>
502 * This shows more info than the generic gpio dump code:
503 * pullups, deglitching, open drain drive.
505 static void mcp23s08_dbg_show(struct seq_file *s, struct gpio_chip *chip)
507 struct mcp23s08 *mcp;
512 mcp = gpiochip_get_data(chip);
514 /* NOTE: we only handle one bank for now ... */
515 bank = '0' + ((mcp->addr >> 1) & 0x7);
517 mutex_lock(&mcp->lock);
518 t = mcp->ops->read_regs(mcp, 0, mcp->cache, ARRAY_SIZE(mcp->cache));
520 seq_printf(s, " I/O ERROR %d\n", t);
524 for (t = 0, mask = 1; t < chip->ngpio; t++, mask <<= 1) {
527 label = gpiochip_is_requested(chip, t);
531 seq_printf(s, " gpio-%-3d P%c.%d (%-12s) %s %s %s",
532 chip->base + t, bank, t, label,
533 (mcp->cache[MCP_IODIR] & mask) ? "in " : "out",
534 (mcp->cache[MCP_GPIO] & mask) ? "hi" : "lo",
535 (mcp->cache[MCP_GPPU] & mask) ? "up" : " ");
536 /* NOTE: ignoring the irq-related registers */
540 mutex_unlock(&mcp->lock);
544 #define mcp23s08_dbg_show NULL
547 /*----------------------------------------------------------------------*/
549 static int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev,
550 void *data, unsigned addr, unsigned type,
551 struct mcp23s08_platform_data *pdata, int cs)
556 mutex_init(&mcp->lock);
560 mcp->irq_active_high = false;
562 mcp->chip.direction_input = mcp23s08_direction_input;
563 mcp->chip.get = mcp23s08_get;
564 mcp->chip.direction_output = mcp23s08_direction_output;
565 mcp->chip.set = mcp23s08_set;
566 mcp->chip.dbg_show = mcp23s08_dbg_show;
568 mcp->chip.of_gpio_n_cells = 2;
569 mcp->chip.of_node = dev->of_node;
573 #ifdef CONFIG_SPI_MASTER
575 mcp->ops = &mcp23s08_ops;
577 mcp->chip.label = "mcp23s08";
581 mcp->ops = &mcp23s17_ops;
582 mcp->chip.ngpio = 16;
583 mcp->chip.label = "mcp23s17";
587 mcp->ops = &mcp23s17_ops;
588 mcp->chip.ngpio = 16;
589 mcp->chip.label = "mcp23s18";
591 #endif /* CONFIG_SPI_MASTER */
593 #if IS_ENABLED(CONFIG_I2C)
595 mcp->ops = &mcp23008_ops;
597 mcp->chip.label = "mcp23008";
601 mcp->ops = &mcp23017_ops;
602 mcp->chip.ngpio = 16;
603 mcp->chip.label = "mcp23017";
605 #endif /* CONFIG_I2C */
608 dev_err(dev, "invalid device type (%d)\n", type);
612 mcp->chip.base = pdata->base;
613 mcp->chip.can_sleep = true;
614 mcp->chip.parent = dev;
615 mcp->chip.owner = THIS_MODULE;
617 /* verify MCP_IOCON.SEQOP = 0, so sequential reads work,
618 * and MCP_IOCON.HAEN = 1, so we work with all chips.
621 status = mcp->ops->read(mcp, MCP_IOCON);
625 mcp->irq_controller = pdata->irq_controller;
626 if (mcp->irq && mcp->irq_controller) {
627 mcp->irq_active_high =
628 of_property_read_bool(mcp->chip.parent->of_node,
629 "microchip,irq-active-high");
631 mirror = pdata->mirror;
634 if ((status & IOCON_SEQOP) || !(status & IOCON_HAEN) || mirror ||
635 mcp->irq_active_high) {
636 /* mcp23s17 has IOCON twice, make sure they are in sync */
637 status &= ~(IOCON_SEQOP | (IOCON_SEQOP << 8));
638 status |= IOCON_HAEN | (IOCON_HAEN << 8);
639 if (mcp->irq_active_high)
640 status |= IOCON_INTPOL | (IOCON_INTPOL << 8);
642 status &= ~(IOCON_INTPOL | (IOCON_INTPOL << 8));
645 status |= IOCON_MIRROR | (IOCON_MIRROR << 8);
647 if (type == MCP_TYPE_S18)
648 status |= IOCON_INTCC | (IOCON_INTCC << 8);
650 status = mcp->ops->write(mcp, MCP_IOCON, status);
655 /* configure ~100K pullups */
656 status = mcp->ops->write(mcp, MCP_GPPU, pdata->chip[cs].pullups);
660 status = mcp->ops->read_regs(mcp, 0, mcp->cache, ARRAY_SIZE(mcp->cache));
664 /* disable inverter on input */
665 if (mcp->cache[MCP_IPOL] != 0) {
666 mcp->cache[MCP_IPOL] = 0;
667 status = mcp->ops->write(mcp, MCP_IPOL, 0);
673 if (mcp->cache[MCP_GPINTEN] != 0) {
674 mcp->cache[MCP_GPINTEN] = 0;
675 status = mcp->ops->write(mcp, MCP_GPINTEN, 0);
680 status = gpiochip_add_data(&mcp->chip, mcp);
684 if (mcp->irq && mcp->irq_controller) {
685 status = mcp23s08_irq_setup(mcp);
692 dev_dbg(dev, "can't setup chip %d, --> %d\n",
697 /*----------------------------------------------------------------------*/
700 #ifdef CONFIG_SPI_MASTER
701 static const struct of_device_id mcp23s08_spi_of_match[] = {
703 .compatible = "microchip,mcp23s08",
704 .data = (void *) MCP_TYPE_S08,
707 .compatible = "microchip,mcp23s17",
708 .data = (void *) MCP_TYPE_S17,
711 .compatible = "microchip,mcp23s18",
712 .data = (void *) MCP_TYPE_S18,
714 /* NOTE: The use of the mcp prefix is deprecated and will be removed. */
716 .compatible = "mcp,mcp23s08",
717 .data = (void *) MCP_TYPE_S08,
720 .compatible = "mcp,mcp23s17",
721 .data = (void *) MCP_TYPE_S17,
725 MODULE_DEVICE_TABLE(of, mcp23s08_spi_of_match);
728 #if IS_ENABLED(CONFIG_I2C)
729 static const struct of_device_id mcp23s08_i2c_of_match[] = {
731 .compatible = "microchip,mcp23008",
732 .data = (void *) MCP_TYPE_008,
735 .compatible = "microchip,mcp23017",
736 .data = (void *) MCP_TYPE_017,
738 /* NOTE: The use of the mcp prefix is deprecated and will be removed. */
740 .compatible = "mcp,mcp23008",
741 .data = (void *) MCP_TYPE_008,
744 .compatible = "mcp,mcp23017",
745 .data = (void *) MCP_TYPE_017,
749 MODULE_DEVICE_TABLE(of, mcp23s08_i2c_of_match);
751 #endif /* CONFIG_OF */
754 #if IS_ENABLED(CONFIG_I2C)
756 static int mcp230xx_probe(struct i2c_client *client,
757 const struct i2c_device_id *id)
759 struct mcp23s08_platform_data *pdata, local_pdata;
760 struct mcp23s08 *mcp;
762 const struct of_device_id *match;
764 match = of_match_device(of_match_ptr(mcp23s08_i2c_of_match),
767 pdata = &local_pdata;
769 pdata->chip[0].pullups = 0;
770 pdata->irq_controller = of_property_read_bool(
772 "interrupt-controller");
773 pdata->mirror = of_property_read_bool(client->dev.of_node,
774 "microchip,irq-mirror");
775 client->irq = irq_of_parse_and_map(client->dev.of_node, 0);
777 pdata = dev_get_platdata(&client->dev);
779 pdata = devm_kzalloc(&client->dev,
780 sizeof(struct mcp23s08_platform_data),
788 mcp = kzalloc(sizeof(*mcp), GFP_KERNEL);
792 mcp->irq = client->irq;
793 status = mcp23s08_probe_one(mcp, &client->dev, client, client->addr,
794 id->driver_data, pdata, 0);
798 i2c_set_clientdata(client, mcp);
808 static int mcp230xx_remove(struct i2c_client *client)
810 struct mcp23s08 *mcp = i2c_get_clientdata(client);
812 gpiochip_remove(&mcp->chip);
818 static const struct i2c_device_id mcp230xx_id[] = {
819 { "mcp23008", MCP_TYPE_008 },
820 { "mcp23017", MCP_TYPE_017 },
823 MODULE_DEVICE_TABLE(i2c, mcp230xx_id);
825 static struct i2c_driver mcp230xx_driver = {
828 .of_match_table = of_match_ptr(mcp23s08_i2c_of_match),
830 .probe = mcp230xx_probe,
831 .remove = mcp230xx_remove,
832 .id_table = mcp230xx_id,
835 static int __init mcp23s08_i2c_init(void)
837 return i2c_add_driver(&mcp230xx_driver);
840 static void mcp23s08_i2c_exit(void)
842 i2c_del_driver(&mcp230xx_driver);
847 static int __init mcp23s08_i2c_init(void) { return 0; }
848 static void mcp23s08_i2c_exit(void) { }
850 #endif /* CONFIG_I2C */
852 /*----------------------------------------------------------------------*/
854 #ifdef CONFIG_SPI_MASTER
856 static int mcp23s08_probe(struct spi_device *spi)
858 struct mcp23s08_platform_data *pdata, local_pdata;
861 struct mcp23s08_driver_data *data;
864 const struct of_device_id *match;
865 u32 spi_present_mask = 0;
867 match = of_match_device(of_match_ptr(mcp23s08_spi_of_match), &spi->dev);
869 type = (int)(uintptr_t)match->data;
870 status = of_property_read_u32(spi->dev.of_node,
871 "microchip,spi-present-mask", &spi_present_mask);
873 status = of_property_read_u32(spi->dev.of_node,
874 "mcp,spi-present-mask", &spi_present_mask);
877 "DT has no spi-present-mask\n");
881 if ((spi_present_mask <= 0) || (spi_present_mask >= 256)) {
882 dev_err(&spi->dev, "invalid spi-present-mask\n");
886 pdata = &local_pdata;
888 for (addr = 0; addr < ARRAY_SIZE(pdata->chip); addr++) {
889 pdata->chip[addr].pullups = 0;
890 if (spi_present_mask & (1 << addr))
893 pdata->irq_controller = of_property_read_bool(
895 "interrupt-controller");
896 pdata->mirror = of_property_read_bool(spi->dev.of_node,
897 "microchip,irq-mirror");
899 type = spi_get_device_id(spi)->driver_data;
900 pdata = dev_get_platdata(&spi->dev);
902 pdata = devm_kzalloc(&spi->dev,
903 sizeof(struct mcp23s08_platform_data),
908 for (addr = 0; addr < ARRAY_SIZE(pdata->chip); addr++) {
909 if (!pdata->chip[addr].is_present)
912 if ((type == MCP_TYPE_S08) && (addr > 3)) {
914 "mcp23s08 only supports address 0..3\n");
917 spi_present_mask |= 1 << addr;
924 data = devm_kzalloc(&spi->dev,
925 sizeof(*data) + chips * sizeof(struct mcp23s08),
930 spi_set_drvdata(spi, data);
932 spi->irq = irq_of_parse_and_map(spi->dev.of_node, 0);
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 data->mcp[addr]->irq = spi->irq;
940 status = mcp23s08_probe_one(data->mcp[addr], &spi->dev, spi,
941 0x40 | (addr << 1), type, pdata,
946 if (pdata->base != -1)
947 pdata->base += data->mcp[addr]->chip.ngpio;
948 ngpio += data->mcp[addr]->chip.ngpio;
952 /* NOTE: these chips have a relatively sane IRQ framework, with
953 * per-signal masking and level/edge triggering. It's not yet
960 for (addr = 0; addr < ARRAY_SIZE(data->mcp); addr++) {
962 if (!data->mcp[addr])
964 gpiochip_remove(&data->mcp[addr]->chip);
969 static int mcp23s08_remove(struct spi_device *spi)
971 struct mcp23s08_driver_data *data = spi_get_drvdata(spi);
974 for (addr = 0; addr < ARRAY_SIZE(data->mcp); addr++) {
976 if (!data->mcp[addr])
979 gpiochip_remove(&data->mcp[addr]->chip);
985 static const struct spi_device_id mcp23s08_ids[] = {
986 { "mcp23s08", MCP_TYPE_S08 },
987 { "mcp23s17", MCP_TYPE_S17 },
988 { "mcp23s18", MCP_TYPE_S18 },
991 MODULE_DEVICE_TABLE(spi, mcp23s08_ids);
993 static struct spi_driver mcp23s08_driver = {
994 .probe = mcp23s08_probe,
995 .remove = mcp23s08_remove,
996 .id_table = mcp23s08_ids,
999 .of_match_table = of_match_ptr(mcp23s08_spi_of_match),
1003 static int __init mcp23s08_spi_init(void)
1005 return spi_register_driver(&mcp23s08_driver);
1008 static void mcp23s08_spi_exit(void)
1010 spi_unregister_driver(&mcp23s08_driver);
1015 static int __init mcp23s08_spi_init(void) { return 0; }
1016 static void mcp23s08_spi_exit(void) { }
1018 #endif /* CONFIG_SPI_MASTER */
1020 /*----------------------------------------------------------------------*/
1022 static int __init mcp23s08_init(void)
1026 ret = mcp23s08_spi_init();
1030 ret = mcp23s08_i2c_init();
1037 mcp23s08_spi_exit();
1041 /* register after spi/i2c postcore initcall and before
1042 * subsys initcalls that may rely on these GPIOs
1044 subsys_initcall(mcp23s08_init);
1046 static void __exit mcp23s08_exit(void)
1048 mcp23s08_spi_exit();
1049 mcp23s08_i2c_exit();
1051 module_exit(mcp23s08_exit);
1053 MODULE_LICENSE("GPL");