[mirror_ubuntu-focal-kernel.git] / drivers / gpio / gpio-mcp23s08.c

/*
 * MCP23S08 SPI/GPIO gpio expander driver
 */

#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/mutex.h>
#include <linux/gpio.h>
#include <linux/i2c.h>
#include <linux/spi/spi.h>
#include <linux/spi/mcp23s08.h>
#include <linux/slab.h>
#include <asm/byteorder.h>

/**
 * MCP types supported by driver
 */
#define MCP_TYPE_S08	0
#define MCP_TYPE_S17	1
#define MCP_TYPE_008	2
#define MCP_TYPE_017	3

/* Registers are all 8 bits wide.
 *
 * The mcp23s17 has twice as many bits, and can be configured to work
 * with either 16 bit registers or with two adjacent 8 bit banks.
 */
#define MCP_IODIR	0x00		/* init/reset:  all ones */
#define MCP_IPOL	0x01
#define MCP_GPINTEN	0x02
#define MCP_DEFVAL	0x03
#define MCP_INTCON	0x04
#define MCP_IOCON	0x05
#	define IOCON_SEQOP	(1 << 5)
#	define IOCON_HAEN	(1 << 3)
#	define IOCON_ODR	(1 << 2)
#	define IOCON_INTPOL	(1 << 1)
#define MCP_GPPU	0x06
#define MCP_INTF	0x07
#define MCP_INTCAP	0x08
#define MCP_GPIO	0x09
#define MCP_OLAT	0x0a

struct mcp23s08;

struct mcp23s08_ops {
	int	(*read)(struct mcp23s08 *mcp, unsigned reg);
	int	(*write)(struct mcp23s08 *mcp, unsigned reg, unsigned val);
	int	(*read_regs)(struct mcp23s08 *mcp, unsigned reg,
			     u16 *vals, unsigned n);
};

struct mcp23s08 {
	u8			addr;

	u16			cache[11];
	/* lock protects the cached values */
	struct mutex		lock;

	struct gpio_chip	chip;

	const struct mcp23s08_ops	*ops;
	void			*data; /* ops specific data */
};

/* A given spi_device can represent up to eight mcp23sxx chips
 * sharing the same chipselect but using different addresses
 * (e.g. chips #0 and #3 might be populated, but not #1 or $2).
 * Driver data holds all the per-chip data.
 */
struct mcp23s08_driver_data {
	unsigned		ngpio;
	struct mcp23s08		*mcp[8];
	struct mcp23s08		chip[];
};

/*----------------------------------------------------------------------*/

#ifdef CONFIG_I2C

static int mcp23008_read(struct mcp23s08 *mcp, unsigned reg)
{
	return i2c_smbus_read_byte_data(mcp->data, reg);
}

static int mcp23008_write(struct mcp23s08 *mcp, unsigned reg, unsigned val)
{
	return i2c_smbus_write_byte_data(mcp->data, reg, val);
}

static int
mcp23008_read_regs(struct mcp23s08 *mcp, unsigned reg, u16 *vals, unsigned n)
{
	while (n--) {
		int ret = mcp23008_read(mcp, reg++);
		if (ret < 0)
			return ret;
		*vals++ = ret;
	}

	return 0;
}

static int mcp23017_read(struct mcp23s08 *mcp, unsigned reg)
{
	return i2c_smbus_read_word_data(mcp->data, reg << 1);
}

static int mcp23017_write(struct mcp23s08 *mcp, unsigned reg, unsigned val)
{
	return i2c_smbus_write_word_data(mcp->data, reg << 1, val);
}

static int
mcp23017_read_regs(struct mcp23s08 *mcp, unsigned reg, u16 *vals, unsigned n)
{
	while (n--) {
		int ret = mcp23017_read(mcp, reg++);
		if (ret < 0)
			return ret;
		*vals++ = ret;
	}

	return 0;
}

static const struct mcp23s08_ops mcp23008_ops = {
	.read		= mcp23008_read,
	.write		= mcp23008_write,
	.read_regs	= mcp23008_read_regs,
};

static const struct mcp23s08_ops mcp23017_ops = {
	.read		= mcp23017_read,
	.write		= mcp23017_write,
	.read_regs	= mcp23017_read_regs,
};

#endif /* CONFIG_I2C */

/*----------------------------------------------------------------------*/

#ifdef CONFIG_SPI_MASTER

static int mcp23s08_read(struct mcp23s08 *mcp, unsigned reg)
{
	u8	tx[2], rx[1];
	int	status;

	tx[0] = mcp->addr | 0x01;
	tx[1] = reg;
	status = spi_write_then_read(mcp->data, tx, sizeof tx, rx, sizeof rx);
	return (status < 0) ? status : rx[0];
}

static int mcp23s08_write(struct mcp23s08 *mcp, unsigned reg, unsigned val)
{
	u8	tx[3];

	tx[0] = mcp->addr;
	tx[1] = reg;
	tx[2] = val;
	return spi_write_then_read(mcp->data, tx, sizeof tx, NULL, 0);
}

static int
mcp23s08_read_regs(struct mcp23s08 *mcp, unsigned reg, u16 *vals, unsigned n)
{
	u8	tx[2], *tmp;
	int	status;

	if ((n + reg) > sizeof mcp->cache)
		return -EINVAL;
	tx[0] = mcp->addr | 0x01;
	tx[1] = reg;

	tmp = (u8 *)vals;
	status = spi_write_then_read(mcp->data, tx, sizeof tx, tmp, n);
	if (status >= 0) {
		while (n--)
			vals[n] = tmp[n]; /* expand to 16bit */
	}
	return status;
}

static int mcp23s17_read(struct mcp23s08 *mcp, unsigned reg)
{
	u8	tx[2], rx[2];
	int	status;

	tx[0] = mcp->addr | 0x01;
	tx[1] = reg << 1;
	status = spi_write_then_read(mcp->data, tx, sizeof tx, rx, sizeof rx);
	return (status < 0) ? status : (rx[0] | (rx[1] << 8));
}

static int mcp23s17_write(struct mcp23s08 *mcp, unsigned reg, unsigned val)
{
	u8	tx[4];

	tx[0] = mcp->addr;
	tx[1] = reg << 1;
	tx[2] = val;
	tx[3] = val >> 8;
	return spi_write_then_read(mcp->data, tx, sizeof tx, NULL, 0);
}

static int
mcp23s17_read_regs(struct mcp23s08 *mcp, unsigned reg, u16 *vals, unsigned n)
{
	u8	tx[2];
	int	status;

	if ((n + reg) > sizeof mcp->cache)
		return -EINVAL;
	tx[0] = mcp->addr | 0x01;
	tx[1] = reg << 1;

	status = spi_write_then_read(mcp->data, tx, sizeof tx,
				     (u8 *)vals, n * 2);
	if (status >= 0) {
		while (n--)
			vals[n] = __le16_to_cpu((__le16)vals[n]);
	}

	return status;
}

static const struct mcp23s08_ops mcp23s08_ops = {
	.read		= mcp23s08_read,
	.write		= mcp23s08_write,
	.read_regs	= mcp23s08_read_regs,
};

static const struct mcp23s08_ops mcp23s17_ops = {
	.read		= mcp23s17_read,
	.write		= mcp23s17_write,
	.read_regs	= mcp23s17_read_regs,
};

#endif /* CONFIG_SPI_MASTER */

/*----------------------------------------------------------------------*/

static int mcp23s08_direction_input(struct gpio_chip *chip, unsigned offset)
{
	struct mcp23s08	*mcp = container_of(chip, struct mcp23s08, chip);
	int status;

	mutex_lock(&mcp->lock);
	mcp->cache[MCP_IODIR] |= (1 << offset);
	status = mcp->ops->write(mcp, MCP_IODIR, mcp->cache[MCP_IODIR]);
	mutex_unlock(&mcp->lock);
	return status;
}

static int mcp23s08_get(struct gpio_chip *chip, unsigned offset)
{
	struct mcp23s08	*mcp = container_of(chip, struct mcp23s08, chip);
	int status;

	mutex_lock(&mcp->lock);

	/* REVISIT reading this clears any IRQ ... */
	status = mcp->ops->read(mcp, MCP_GPIO);
	if (status < 0)
		status = 0;
	else {
		mcp->cache[MCP_GPIO] = status;
		status = !!(status & (1 << offset));
	}
	mutex_unlock(&mcp->lock);
	return status;
}

static int __mcp23s08_set(struct mcp23s08 *mcp, unsigned mask, int value)
{
	unsigned olat = mcp->cache[MCP_OLAT];

	if (value)
		olat |= mask;
	else
		olat &= ~mask;
	mcp->cache[MCP_OLAT] = olat;
	return mcp->ops->write(mcp, MCP_OLAT, olat);
}

static void mcp23s08_set(struct gpio_chip *chip, unsigned offset, int value)
{
	struct mcp23s08	*mcp = container_of(chip, struct mcp23s08, chip);
	unsigned mask = 1 << offset;

	mutex_lock(&mcp->lock);
	__mcp23s08_set(mcp, mask, value);
	mutex_unlock(&mcp->lock);
}

static int
mcp23s08_direction_output(struct gpio_chip *chip, unsigned offset, int value)
{
	struct mcp23s08	*mcp = container_of(chip, struct mcp23s08, chip);
	unsigned mask = 1 << offset;
	int status;

	mutex_lock(&mcp->lock);
	status = __mcp23s08_set(mcp, mask, value);
	if (status == 0) {
		mcp->cache[MCP_IODIR] &= ~mask;
		status = mcp->ops->write(mcp, MCP_IODIR, mcp->cache[MCP_IODIR]);
	}
	mutex_unlock(&mcp->lock);
	return status;
}

/*----------------------------------------------------------------------*/

#ifdef CONFIG_DEBUG_FS

#include <linux/seq_file.h>

/*
 * This shows more info than the generic gpio dump code:
 * pullups, deglitching, open drain drive.
 */
static void mcp23s08_dbg_show(struct seq_file *s, struct gpio_chip *chip)
{
	struct mcp23s08	*mcp;
	char		bank;
	int		t;
	unsigned	mask;

	mcp = container_of(chip, struct mcp23s08, chip);

	/* NOTE: we only handle one bank for now ... */
	bank = '0' + ((mcp->addr >> 1) & 0x7);

	mutex_lock(&mcp->lock);
	t = mcp->ops->read_regs(mcp, 0, mcp->cache, ARRAY_SIZE(mcp->cache));
	if (t < 0) {
		seq_printf(s, " I/O ERROR %d\n", t);
		goto done;
	}

	for (t = 0, mask = 1; t < chip->ngpio; t++, mask <<= 1) {
		const char	*label;

		label = gpiochip_is_requested(chip, t);
		if (!label)
			continue;

		seq_printf(s, " gpio-%-3d P%c.%d (%-12s) %s %s %s",
			chip->base + t, bank, t, label,
			(mcp->cache[MCP_IODIR] & mask) ? "in " : "out",
			(mcp->cache[MCP_GPIO] & mask) ? "hi" : "lo",
			(mcp->cache[MCP_GPPU] & mask) ? "  " : "up");
		/* NOTE:  ignoring the irq-related registers */
		seq_printf(s, "\n");
	}
done:
	mutex_unlock(&mcp->lock);
}

#else
#define mcp23s08_dbg_show	NULL
#endif

/*----------------------------------------------------------------------*/

static int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev,
			      void *data, unsigned addr,
			      unsigned type, unsigned base, unsigned pullups)
{
	int status;

	mutex_init(&mcp->lock);

	mcp->data = data;
	mcp->addr = addr;

	mcp->chip.direction_input = mcp23s08_direction_input;
	mcp->chip.get = mcp23s08_get;
	mcp->chip.direction_output = mcp23s08_direction_output;
	mcp->chip.set = mcp23s08_set;
	mcp->chip.dbg_show = mcp23s08_dbg_show;

	switch (type) {
#ifdef CONFIG_SPI_MASTER
	case MCP_TYPE_S08:
		mcp->ops = &mcp23s08_ops;
		mcp->chip.ngpio = 8;
		mcp->chip.label = "mcp23s08";
		break;

	case MCP_TYPE_S17:
		mcp->ops = &mcp23s17_ops;
		mcp->chip.ngpio = 16;
		mcp->chip.label = "mcp23s17";
		break;
#endif /* CONFIG_SPI_MASTER */

#ifdef CONFIG_I2C
	case MCP_TYPE_008:
		mcp->ops = &mcp23008_ops;
		mcp->chip.ngpio = 8;
		mcp->chip.label = "mcp23008";
		break;

	case MCP_TYPE_017:
		mcp->ops = &mcp23017_ops;
		mcp->chip.ngpio = 16;
		mcp->chip.label = "mcp23017";
		break;
#endif /* CONFIG_I2C */

	default:
		dev_err(dev, "invalid device type (%d)\n", type);
		return -EINVAL;
	}

	mcp->chip.base = base;
	mcp->chip.can_sleep = 1;
	mcp->chip.dev = dev;
	mcp->chip.owner = THIS_MODULE;

	/* verify MCP_IOCON.SEQOP = 0, so sequential reads work,
	 * and MCP_IOCON.HAEN = 1, so we work with all chips.
	 */
	status = mcp->ops->read(mcp, MCP_IOCON);
	if (status < 0)
		goto fail;
	if ((status & IOCON_SEQOP) || !(status & IOCON_HAEN)) {
		/* mcp23s17 has IOCON twice, make sure they are in sync */
		status &= ~(IOCON_SEQOP | (IOCON_SEQOP << 8));
		status |= IOCON_HAEN | (IOCON_HAEN << 8);
		status = mcp->ops->write(mcp, MCP_IOCON, status);
		if (status < 0)
			goto fail;
	}

	/* configure ~100K pullups */
	status = mcp->ops->write(mcp, MCP_GPPU, pullups);
	if (status < 0)
		goto fail;

	status = mcp->ops->read_regs(mcp, 0, mcp->cache, ARRAY_SIZE(mcp->cache));
	if (status < 0)
		goto fail;

	/* disable inverter on input */
	if (mcp->cache[MCP_IPOL] != 0) {
		mcp->cache[MCP_IPOL] = 0;
		status = mcp->ops->write(mcp, MCP_IPOL, 0);
		if (status < 0)
			goto fail;
	}

	/* disable irqs */
	if (mcp->cache[MCP_GPINTEN] != 0) {
		mcp->cache[MCP_GPINTEN] = 0;
		status = mcp->ops->write(mcp, MCP_GPINTEN, 0);
		if (status < 0)
			goto fail;
	}

	status = gpiochip_add(&mcp->chip);
fail:
	if (status < 0)
		dev_dbg(dev, "can't setup chip %d, --> %d\n",
			addr, status);
	return status;
}

/*----------------------------------------------------------------------*/

#ifdef CONFIG_I2C

static int __devinit mcp230xx_probe(struct i2c_client *client,
				    const struct i2c_device_id *id)
{
	struct mcp23s08_platform_data *pdata;
	struct mcp23s08 *mcp;
	int status;

	pdata = client->dev.platform_data;
	if (!pdata || !gpio_is_valid(pdata->base)) {
		dev_dbg(&client->dev, "invalid or missing platform data\n");
		return -EINVAL;
	}

	mcp = kzalloc(sizeof *mcp, GFP_KERNEL);
	if (!mcp)
		return -ENOMEM;

	status = mcp23s08_probe_one(mcp, &client->dev, client, client->addr,
				    id->driver_data, pdata->base,
				    pdata->chip[0].pullups);
	if (status)
		goto fail;

	i2c_set_clientdata(client, mcp);

	return 0;

fail:
	kfree(mcp);

	return status;
}

static int __devexit mcp230xx_remove(struct i2c_client *client)
{
	struct mcp23s08 *mcp = i2c_get_clientdata(client);
	int status;

	status = gpiochip_remove(&mcp->chip);
	if (status == 0)
		kfree(mcp);

	return status;
}

static const struct i2c_device_id mcp230xx_id[] = {
	{ "mcp23008", MCP_TYPE_008 },
	{ "mcp23017", MCP_TYPE_017 },
	{ },
};
MODULE_DEVICE_TABLE(i2c, mcp230xx_id);

static struct i2c_driver mcp230xx_driver = {
	.driver = {
		.name	= "mcp230xx",
		.owner	= THIS_MODULE,
	},
	.probe		= mcp230xx_probe,
	.remove		= __devexit_p(mcp230xx_remove),
	.id_table	= mcp230xx_id,
};

static int __init mcp23s08_i2c_init(void)
{
	return i2c_add_driver(&mcp230xx_driver);
}

static void mcp23s08_i2c_exit(void)
{
	i2c_del_driver(&mcp230xx_driver);
}

#else

static int __init mcp23s08_i2c_init(void) { return 0; }
static void mcp23s08_i2c_exit(void) { }

#endif /* CONFIG_I2C */

/*----------------------------------------------------------------------*/

#ifdef CONFIG_SPI_MASTER

static int mcp23s08_probe(struct spi_device *spi)
{
	struct mcp23s08_platform_data	*pdata;
	unsigned			addr;
	unsigned			chips = 0;
	struct mcp23s08_driver_data	*data;
	int				status, type;
	unsigned			base;

	type = spi_get_device_id(spi)->driver_data;

	pdata = spi->dev.platform_data;
	if (!pdata || !gpio_is_valid(pdata->base)) {
		dev_dbg(&spi->dev, "invalid or missing platform data\n");
		return -EINVAL;
	}

	for (addr = 0; addr < ARRAY_SIZE(pdata->chip); addr++) {
		if (!pdata->chip[addr].is_present)
			continue;
		chips++;
		if ((type == MCP_TYPE_S08) && (addr > 3)) {
			dev_err(&spi->dev,
				"mcp23s08 only supports address 0..3\n");
			return -EINVAL;
		}
	}
	if (!chips)
		return -ENODEV;

	data = kzalloc(sizeof *data + chips * sizeof(struct mcp23s08),
			GFP_KERNEL);
	if (!data)
		return -ENOMEM;
	spi_set_drvdata(spi, data);

	base = pdata->base;
	for (addr = 0; addr < ARRAY_SIZE(pdata->chip); addr++) {
		if (!pdata->chip[addr].is_present)
			continue;
		chips--;
		data->mcp[addr] = &data->chip[chips];
		status = mcp23s08_probe_one(data->mcp[addr], &spi->dev, spi,
					    0x40 | (addr << 1), type, base,
					    pdata->chip[addr].pullups);
		if (status < 0)
			goto fail;

		base += (type == MCP_TYPE_S17) ? 16 : 8;
	}
	data->ngpio = base - pdata->base;

	/* NOTE:  these chips have a relatively sane IRQ framework, with
	 * per-signal masking and level/edge triggering.  It's not yet
	 * handled here...
	 */

	return 0;

fail:
	for (addr = 0; addr < ARRAY_SIZE(data->mcp); addr++) {
		int tmp;

		if (!data->mcp[addr])
			continue;
		tmp = gpiochip_remove(&data->mcp[addr]->chip);
		if (tmp < 0)
			dev_err(&spi->dev, "%s --> %d\n", "remove", tmp);
	}
	kfree(data);
	return status;
}

static int mcp23s08_remove(struct spi_device *spi)
{
	struct mcp23s08_driver_data	*data = spi_get_drvdata(spi);
	unsigned			addr;
	int				status = 0;

	for (addr = 0; addr < ARRAY_SIZE(data->mcp); addr++) {
		int tmp;

		if (!data->mcp[addr])
			continue;

		tmp = gpiochip_remove(&data->mcp[addr]->chip);
		if (tmp < 0) {
			dev_err(&spi->dev, "%s --> %d\n", "remove", tmp);
			status = tmp;
		}
	}
	if (status == 0)
		kfree(data);
	return status;
}

static const struct spi_device_id mcp23s08_ids[] = {
	{ "mcp23s08", MCP_TYPE_S08 },
	{ "mcp23s17", MCP_TYPE_S17 },
	{ },
};
MODULE_DEVICE_TABLE(spi, mcp23s08_ids);

static struct spi_driver mcp23s08_driver = {
	.probe		= mcp23s08_probe,
	.remove		= mcp23s08_remove,
	.id_table	= mcp23s08_ids,
	.driver = {
		.name	= "mcp23s08",
		.owner	= THIS_MODULE,
	},
};

static int __init mcp23s08_spi_init(void)
{
	return spi_register_driver(&mcp23s08_driver);
}

static void mcp23s08_spi_exit(void)
{
	spi_unregister_driver(&mcp23s08_driver);
}

#else

static int __init mcp23s08_spi_init(void) { return 0; }
static void mcp23s08_spi_exit(void) { }

#endif /* CONFIG_SPI_MASTER */

/*----------------------------------------------------------------------*/

static int __init mcp23s08_init(void)
{
	int ret;

	ret = mcp23s08_spi_init();
	if (ret)
		goto spi_fail;

	ret = mcp23s08_i2c_init();
	if (ret)
		goto i2c_fail;

	return 0;

 i2c_fail:
	mcp23s08_spi_exit();
 spi_fail:
	return ret;
}
/* register after spi/i2c postcore initcall and before
 * subsys initcalls that may rely on these GPIOs
 */
subsys_initcall(mcp23s08_init);

static void __exit mcp23s08_exit(void)
{
	mcp23s08_spi_exit();
	mcp23s08_i2c_exit();
}
module_exit(mcp23s08_exit);

MODULE_LICENSE("GPL");
Commit	Line	Data
e58b9e27	1	/*
752ad5e8	2	* MCP23S08 SPI/GPIO gpio expander driver
e58b9e27 DB	3	*/
	4
	5	#include <linux/kernel.h>
	6	#include <linux/device.h>
e58b9e27	7	#include <linux/mutex.h>
d120c17f	8	#include <linux/gpio.h>
752ad5e8	9	#include <linux/i2c.h>
e58b9e27 DB	10	#include <linux/spi/spi.h>
e58b9e27 DB	11	#include <linux/spi/mcp23s08.h>
5a0e3ad6	12	#include <linux/slab.h>
0b7bb77f	13	#include <asm/byteorder.h>
e58b9e27	14
0b7bb77f PK	15	/**
	16	* MCP types supported by driver
	17	*/
	18	#define MCP_TYPE_S08 0
	19	#define MCP_TYPE_S17 1
752ad5e8 PK	20	#define MCP_TYPE_008 2
752ad5e8 PK	21	#define MCP_TYPE_017 3
e58b9e27 DB	22
	23	/* Registers are all 8 bits wide.
	24	*
	25	* The mcp23s17 has twice as many bits, and can be configured to work
	26	* with either 16 bit registers or with two adjacent 8 bit banks.
e58b9e27 DB	27	*/
	28	#define MCP_IODIR 0x00 /* init/reset: all ones */
	29	#define MCP_IPOL 0x01
	30	#define MCP_GPINTEN 0x02
	31	#define MCP_DEFVAL 0x03
	32	#define MCP_INTCON 0x04
	33	#define MCP_IOCON 0x05
	34	# define IOCON_SEQOP (1 << 5)
	35	# define IOCON_HAEN (1 << 3)
	36	# define IOCON_ODR (1 << 2)
	37	# define IOCON_INTPOL (1 << 1)
	38	#define MCP_GPPU 0x06
	39	#define MCP_INTF 0x07
	40	#define MCP_INTCAP 0x08
	41	#define MCP_GPIO 0x09
	42	#define MCP_OLAT 0x0a
	43
0b7bb77f PK	44	struct mcp23s08;
	45
	46	struct mcp23s08_ops {
	47	int (read)(struct mcp23s08 mcp, unsigned reg);
	48	int (write)(struct mcp23s08 mcp, unsigned reg, unsigned val);
	49	int (read_regs)(struct mcp23s08 mcp, unsigned reg,
	50	u16 *vals, unsigned n);
	51	};
	52
e58b9e27	53	struct mcp23s08 {
e58b9e27 DB	54	u8 addr;
e58b9e27 DB	55
0b7bb77f	56	u16 cache[11];
e58b9e27 DB	57	/* lock protects the cached values */
e58b9e27 DB	58	struct mutex lock;
e58b9e27 DB	59
	60	struct gpio_chip chip;
	61
0b7bb77f	62	const struct mcp23s08_ops *ops;
d62b98f3	63	void data; / ops specific data */
e58b9e27 DB	64	};
e58b9e27 DB	65
0b7bb77f	66	/* A given spi_device can represent up to eight mcp23sxx chips
8f1cc3b1 DB	67	* sharing the same chipselect but using different addresses
	68	* (e.g. chips #0 and #3 might be populated, but not #1 or $2).
	69	* Driver data holds all the per-chip data.
	70	*/
	71	struct mcp23s08_driver_data {
	72	unsigned ngpio;
0b7bb77f	73	struct mcp23s08 *mcp[8];
8f1cc3b1 DB	74	struct mcp23s08 chip[];
	75	};
	76
752ad5e8 PK	77	/----------------------------------------------------------------------/
	78
	79	#ifdef CONFIG_I2C
	80
	81	static int mcp23008_read(struct mcp23s08 *mcp, unsigned reg)
	82	{
	83	return i2c_smbus_read_byte_data(mcp->data, reg);
	84	}
	85
	86	static int mcp23008_write(struct mcp23s08 *mcp, unsigned reg, unsigned val)
	87	{
	88	return i2c_smbus_write_byte_data(mcp->data, reg, val);
	89	}
	90
	91	static int
	92	mcp23008_read_regs(struct mcp23s08 mcp, unsigned reg, u16 vals, unsigned n)
	93	{
	94	while (n--) {
	95	int ret = mcp23008_read(mcp, reg++);
	96	if (ret < 0)
	97	return ret;
	98	*vals++ = ret;
	99	}
	100
	101	return 0;
	102	}
	103
	104	static int mcp23017_read(struct mcp23s08 *mcp, unsigned reg)
	105	{
	106	return i2c_smbus_read_word_data(mcp->data, reg << 1);
	107	}
	108
	109	static int mcp23017_write(struct mcp23s08 *mcp, unsigned reg, unsigned val)
	110	{
	111	return i2c_smbus_write_word_data(mcp->data, reg << 1, val);
	112	}
	113
	114	static int
	115	mcp23017_read_regs(struct mcp23s08 mcp, unsigned reg, u16 vals, unsigned n)
	116	{
	117	while (n--) {
	118	int ret = mcp23017_read(mcp, reg++);
	119	if (ret < 0)
	120	return ret;
	121	*vals++ = ret;
	122	}
	123
	124	return 0;
	125	}
	126
	127	static const struct mcp23s08_ops mcp23008_ops = {
	128	.read = mcp23008_read,
	129	.write = mcp23008_write,
	130	.read_regs = mcp23008_read_regs,
	131	};
	132
	133	static const struct mcp23s08_ops mcp23017_ops = {
	134	.read = mcp23017_read,
	135	.write = mcp23017_write,
	136	.read_regs = mcp23017_read_regs,
	137	};
	138
	139	#endif /* CONFIG_I2C */
	140
141	/----------------------------------------------------------------------/
142
d62b98f3 PK	143	#ifdef CONFIG_SPI_MASTER
d62b98f3 PK	144
e58b9e27 DB	145	static int mcp23s08_read(struct mcp23s08 *mcp, unsigned reg)
	146	{
	147	u8 tx[2], rx[1];
	148	int status;
	149
	150	tx[0] = mcp->addr \| 0x01;
	151	tx[1] = reg;
d62b98f3	152	status = spi_write_then_read(mcp->data, tx, sizeof tx, rx, sizeof rx);
e58b9e27 DB	153	return (status < 0) ? status : rx[0];
	154	}
	155
0b7bb77f	156	static int mcp23s08_write(struct mcp23s08 *mcp, unsigned reg, unsigned val)
e58b9e27 DB	157	{
	158	u8 tx[3];
	159
	160	tx[0] = mcp->addr;
	161	tx[1] = reg;
	162	tx[2] = val;
d62b98f3	163	return spi_write_then_read(mcp->data, tx, sizeof tx, NULL, 0);
e58b9e27 DB	164	}
	165
	166	static int
0b7bb77f	167	mcp23s08_read_regs(struct mcp23s08 mcp, unsigned reg, u16 vals, unsigned n)
e58b9e27	168	{
0b7bb77f PK	169	u8 tx[2], *tmp;
0b7bb77f PK	170	int status;
e58b9e27 DB	171
	172	if ((n + reg) > sizeof mcp->cache)
	173	return -EINVAL;
	174	tx[0] = mcp->addr \| 0x01;
	175	tx[1] = reg;
0b7bb77f PK	176
0b7bb77f PK	177	tmp = (u8 *)vals;
d62b98f3	178	status = spi_write_then_read(mcp->data, tx, sizeof tx, tmp, n);
0b7bb77f PK	179	if (status >= 0) {
	180	while (n--)
	181	vals[n] = tmp[n]; /* expand to 16bit */
	182	}
	183	return status;
	184	}
	185
	186	static int mcp23s17_read(struct mcp23s08 *mcp, unsigned reg)
	187	{
	188	u8 tx[2], rx[2];
	189	int status;
	190
	191	tx[0] = mcp->addr \| 0x01;
	192	tx[1] = reg << 1;
d62b98f3	193	status = spi_write_then_read(mcp->data, tx, sizeof tx, rx, sizeof rx);
0b7bb77f PK	194	return (status < 0) ? status : (rx[0] \| (rx[1] << 8));
	195	}
	196
	197	static int mcp23s17_write(struct mcp23s08 *mcp, unsigned reg, unsigned val)
	198	{
	199	u8 tx[4];
	200
	201	tx[0] = mcp->addr;
	202	tx[1] = reg << 1;
	203	tx[2] = val;
	204	tx[3] = val >> 8;
d62b98f3	205	return spi_write_then_read(mcp->data, tx, sizeof tx, NULL, 0);
0b7bb77f PK	206	}
	207
	208	static int
	209	mcp23s17_read_regs(struct mcp23s08 mcp, unsigned reg, u16 vals, unsigned n)
	210	{
	211	u8 tx[2];
	212	int status;
	213
	214	if ((n + reg) > sizeof mcp->cache)
	215	return -EINVAL;
	216	tx[0] = mcp->addr \| 0x01;
	217	tx[1] = reg << 1;
	218
d62b98f3	219	status = spi_write_then_read(mcp->data, tx, sizeof tx,
0b7bb77f PK	220	(u8 )vals, n 2);
	221	if (status >= 0) {
	222	while (n--)
	223	vals[n] = __le16_to_cpu((__le16)vals[n]);
	224	}
	225
	226	return status;
e58b9e27 DB	227	}
e58b9e27 DB	228
0b7bb77f PK	229	static const struct mcp23s08_ops mcp23s08_ops = {
	230	.read = mcp23s08_read,
	231	.write = mcp23s08_write,
	232	.read_regs = mcp23s08_read_regs,
	233	};
	234
	235	static const struct mcp23s08_ops mcp23s17_ops = {
	236	.read = mcp23s17_read,
	237	.write = mcp23s17_write,
	238	.read_regs = mcp23s17_read_regs,
	239	};
	240
d62b98f3	241	#endif /* CONFIG_SPI_MASTER */
0b7bb77f	242
e58b9e27 DB	243	/----------------------------------------------------------------------/
	244
	245	static int mcp23s08_direction_input(struct gpio_chip *chip, unsigned offset)
	246	{
	247	struct mcp23s08 *mcp = container_of(chip, struct mcp23s08, chip);
	248	int status;
	249
	250	mutex_lock(&mcp->lock);
	251	mcp->cache[MCP_IODIR] \|= (1 << offset);
0b7bb77f	252	status = mcp->ops->write(mcp, MCP_IODIR, mcp->cache[MCP_IODIR]);
e58b9e27 DB	253	mutex_unlock(&mcp->lock);
	254	return status;
	255	}
	256
	257	static int mcp23s08_get(struct gpio_chip *chip, unsigned offset)
	258	{
	259	struct mcp23s08 *mcp = container_of(chip, struct mcp23s08, chip);
	260	int status;
	261
	262	mutex_lock(&mcp->lock);
	263
	264	/* REVISIT reading this clears any IRQ ... */
0b7bb77f	265	status = mcp->ops->read(mcp, MCP_GPIO);
e58b9e27 DB	266	if (status < 0)
	267	status = 0;
	268	else {
	269	mcp->cache[MCP_GPIO] = status;
	270	status = !!(status & (1 << offset));
	271	}
	272	mutex_unlock(&mcp->lock);
	273	return status;
	274	}
	275
	276	static int __mcp23s08_set(struct mcp23s08 *mcp, unsigned mask, int value)
	277	{
0b7bb77f	278	unsigned olat = mcp->cache[MCP_OLAT];
e58b9e27 DB	279
	280	if (value)
	281	olat \|= mask;
	282	else
	283	olat &= ~mask;
	284	mcp->cache[MCP_OLAT] = olat;
0b7bb77f	285	return mcp->ops->write(mcp, MCP_OLAT, olat);
e58b9e27 DB	286	}
	287
	288	static void mcp23s08_set(struct gpio_chip *chip, unsigned offset, int value)
	289	{
	290	struct mcp23s08 *mcp = container_of(chip, struct mcp23s08, chip);
0b7bb77f	291	unsigned mask = 1 << offset;
e58b9e27 DB	292
	293	mutex_lock(&mcp->lock);
	294	__mcp23s08_set(mcp, mask, value);
	295	mutex_unlock(&mcp->lock);
	296	}
	297
	298	static int
	299	mcp23s08_direction_output(struct gpio_chip *chip, unsigned offset, int value)
	300	{
	301	struct mcp23s08 *mcp = container_of(chip, struct mcp23s08, chip);
0b7bb77f	302	unsigned mask = 1 << offset;
e58b9e27 DB	303	int status;
	304
	305	mutex_lock(&mcp->lock);
	306	status = __mcp23s08_set(mcp, mask, value);
	307	if (status == 0) {
	308	mcp->cache[MCP_IODIR] &= ~mask;
0b7bb77f	309	status = mcp->ops->write(mcp, MCP_IODIR, mcp->cache[MCP_IODIR]);
e58b9e27 DB	310	}
	311	mutex_unlock(&mcp->lock);
	312	return status;
	313	}
	314
	315	/----------------------------------------------------------------------/
	316
	317	#ifdef CONFIG_DEBUG_FS
	318
	319	#include <linux/seq_file.h>
	320
	321	/*
	322	* This shows more info than the generic gpio dump code:
	323	* pullups, deglitching, open drain drive.
	324	*/
	325	static void mcp23s08_dbg_show(struct seq_file s, struct gpio_chip chip)
	326	{
	327	struct mcp23s08 *mcp;
	328	char bank;
1d1c1d9b	329	int t;
e58b9e27 DB	330	unsigned mask;
	331
	332	mcp = container_of(chip, struct mcp23s08, chip);
	333
	334	/* NOTE: we only handle one bank for now ... */
0b7bb77f	335	bank = '0' + ((mcp->addr >> 1) & 0x7);
e58b9e27 DB	336
e58b9e27 DB	337	mutex_lock(&mcp->lock);
0b7bb77f	338	t = mcp->ops->read_regs(mcp, 0, mcp->cache, ARRAY_SIZE(mcp->cache));
e58b9e27 DB	339	if (t < 0) {
	340	seq_printf(s, " I/O ERROR %d\n", t);
	341	goto done;
	342	}
	343
0b7bb77f	344	for (t = 0, mask = 1; t < chip->ngpio; t++, mask <<= 1) {
e58b9e27 DB	345	const char *label;
	346
	347	label = gpiochip_is_requested(chip, t);
	348	if (!label)
	349	continue;
	350
	351	seq_printf(s, " gpio-%-3d P%c.%d (%-12s) %s %s %s",
	352	chip->base + t, bank, t, label,
	353	(mcp->cache[MCP_IODIR] & mask) ? "in " : "out",
	354	(mcp->cache[MCP_GPIO] & mask) ? "hi" : "lo",
	355	(mcp->cache[MCP_GPPU] & mask) ? " " : "up");
	356	/* NOTE: ignoring the irq-related registers */
	357	seq_printf(s, "\n");
	358	}
	359	done:
	360	mutex_unlock(&mcp->lock);
	361	}
	362
	363	#else
	364	#define mcp23s08_dbg_show NULL
	365	#endif
	366
	367	/----------------------------------------------------------------------/
	368
d62b98f3 PK	369	static int mcp23s08_probe_one(struct mcp23s08 mcp, struct device dev,
d62b98f3 PK	370	void *data, unsigned addr,
0b7bb77f	371	unsigned type, unsigned base, unsigned pullups)
e58b9e27	372	{
d62b98f3	373	int status;
e58b9e27	374
e58b9e27 DB	375	mutex_init(&mcp->lock);
e58b9e27 DB	376
d62b98f3 PK	377	mcp->data = data;
d62b98f3 PK	378	mcp->addr = addr;
e58b9e27	379
e58b9e27 DB	380	mcp->chip.direction_input = mcp23s08_direction_input;
	381	mcp->chip.get = mcp23s08_get;
	382	mcp->chip.direction_output = mcp23s08_direction_output;
	383	mcp->chip.set = mcp23s08_set;
	384	mcp->chip.dbg_show = mcp23s08_dbg_show;
	385
d62b98f3 PK	386	switch (type) {
	387	#ifdef CONFIG_SPI_MASTER
	388	case MCP_TYPE_S08:
0b7bb77f PK	389	mcp->ops = &mcp23s08_ops;
	390	mcp->chip.ngpio = 8;
	391	mcp->chip.label = "mcp23s08";
d62b98f3 PK	392	break;
	393
	394	case MCP_TYPE_S17:
	395	mcp->ops = &mcp23s17_ops;
	396	mcp->chip.ngpio = 16;
	397	mcp->chip.label = "mcp23s17";
	398	break;
	399	#endif /* CONFIG_SPI_MASTER */
	400
752ad5e8 PK	401	#ifdef CONFIG_I2C
	402	case MCP_TYPE_008:
	403	mcp->ops = &mcp23008_ops;
	404	mcp->chip.ngpio = 8;
	405	mcp->chip.label = "mcp23008";
	406	break;
	407
	408	case MCP_TYPE_017:
	409	mcp->ops = &mcp23017_ops;
	410	mcp->chip.ngpio = 16;
	411	mcp->chip.label = "mcp23017";
	412	break;
	413	#endif /* CONFIG_I2C */
	414
d62b98f3 PK	415	default:
	416	dev_err(dev, "invalid device type (%d)\n", type);
	417	return -EINVAL;
0b7bb77f	418	}
d62b98f3	419
8f1cc3b1	420	mcp->chip.base = base;
e58b9e27	421	mcp->chip.can_sleep = 1;
d62b98f3	422	mcp->chip.dev = dev;
d72cbed0	423	mcp->chip.owner = THIS_MODULE;
e58b9e27	424
8f1cc3b1 DB	425	/* verify MCP_IOCON.SEQOP = 0, so sequential reads work,
	426	* and MCP_IOCON.HAEN = 1, so we work with all chips.
	427	*/
0b7bb77f	428	status = mcp->ops->read(mcp, MCP_IOCON);
e58b9e27 DB	429	if (status < 0)
e58b9e27 DB	430	goto fail;
8f1cc3b1	431	if ((status & IOCON_SEQOP) \|\| !(status & IOCON_HAEN)) {
0b7bb77f PK	432	/* mcp23s17 has IOCON twice, make sure they are in sync */
	433	status &= ~(IOCON_SEQOP \| (IOCON_SEQOP << 8));
	434	status \|= IOCON_HAEN \| (IOCON_HAEN << 8);
	435	status = mcp->ops->write(mcp, MCP_IOCON, status);
e58b9e27 DB	436	if (status < 0)
	437	goto fail;
	438	}
	439
	440	/* configure ~100K pullups */
0b7bb77f	441	status = mcp->ops->write(mcp, MCP_GPPU, pullups);
e58b9e27 DB	442	if (status < 0)
	443	goto fail;
	444
0b7bb77f	445	status = mcp->ops->read_regs(mcp, 0, mcp->cache, ARRAY_SIZE(mcp->cache));
e58b9e27 DB	446	if (status < 0)
	447	goto fail;
	448
	449	/* disable inverter on input */
	450	if (mcp->cache[MCP_IPOL] != 0) {
	451	mcp->cache[MCP_IPOL] = 0;
0b7bb77f PK	452	status = mcp->ops->write(mcp, MCP_IPOL, 0);
	453	if (status < 0)
	454	goto fail;
e58b9e27 DB	455	}
	456
	457	/* disable irqs */
	458	if (mcp->cache[MCP_GPINTEN] != 0) {
	459	mcp->cache[MCP_GPINTEN] = 0;
0b7bb77f	460	status = mcp->ops->write(mcp, MCP_GPINTEN, 0);
8f1cc3b1 DB	461	if (status < 0)
8f1cc3b1 DB	462	goto fail;
e58b9e27 DB	463	}
	464
	465	status = gpiochip_add(&mcp->chip);
8f1cc3b1 DB	466	fail:
8f1cc3b1 DB	467	if (status < 0)
d62b98f3 PK	468	dev_dbg(dev, "can't setup chip %d, --> %d\n",
d62b98f3 PK	469	addr, status);
8f1cc3b1 DB	470	return status;
	471	}
	472
752ad5e8 PK	473	/----------------------------------------------------------------------/
	474
	475	#ifdef CONFIG_I2C
	476
	477	static int __devinit mcp230xx_probe(struct i2c_client *client,
	478	const struct i2c_device_id *id)
	479	{
	480	struct mcp23s08_platform_data *pdata;
	481	struct mcp23s08 *mcp;
	482	int status;
	483
	484	pdata = client->dev.platform_data;
	485	if (!pdata \|\| !gpio_is_valid(pdata->base)) {
	486	dev_dbg(&client->dev, "invalid or missing platform data\n");
	487	return -EINVAL;
	488	}
	489
	490	mcp = kzalloc(sizeof *mcp, GFP_KERNEL);
	491	if (!mcp)
	492	return -ENOMEM;
	493
	494	status = mcp23s08_probe_one(mcp, &client->dev, client, client->addr,
	495	id->driver_data, pdata->base,
	496	pdata->chip[0].pullups);
	497	if (status)
	498	goto fail;
	499
	500	i2c_set_clientdata(client, mcp);
	501
	502	return 0;
	503
	504	fail:
	505	kfree(mcp);
	506
	507	return status;
	508	}
	509
	510	static int __devexit mcp230xx_remove(struct i2c_client *client)
	511	{
	512	struct mcp23s08 *mcp = i2c_get_clientdata(client);
	513	int status;
	514
	515	status = gpiochip_remove(&mcp->chip);
	516	if (status == 0)
	517	kfree(mcp);
	518
	519	return status;
	520	}
	521
	522	static const struct i2c_device_id mcp230xx_id[] = {
	523	{ "mcp23008", MCP_TYPE_008 },
	524	{ "mcp23017", MCP_TYPE_017 },
	525	{ },
	526	};
	527	MODULE_DEVICE_TABLE(i2c, mcp230xx_id);
	528
	529	static struct i2c_driver mcp230xx_driver = {
	530	.driver = {
	531	.name = "mcp230xx",
	532	.owner = THIS_MODULE,
	533	},
	534	.probe = mcp230xx_probe,
	535	.remove = __devexit_p(mcp230xx_remove),
	536	.id_table = mcp230xx_id,
537	};
538
539	static int __init mcp23s08_i2c_init(void)
540	{
541	return i2c_add_driver(&mcp230xx_driver);
542	}
543
544	static void mcp23s08_i2c_exit(void)
545	{
546	i2c_del_driver(&mcp230xx_driver);
547	}
548
549	#else
550
551	static int __init mcp23s08_i2c_init(void) { return 0; }
552	static void mcp23s08_i2c_exit(void) { }
553
554	#endif /* CONFIG_I2C */
555
556	/----------------------------------------------------------------------/
557
d62b98f3 PK	558	#ifdef CONFIG_SPI_MASTER
d62b98f3 PK	559
8f1cc3b1 DB	560	static int mcp23s08_probe(struct spi_device *spi)
	561	{
	562	struct mcp23s08_platform_data *pdata;
	563	unsigned addr;
	564	unsigned chips = 0;
	565	struct mcp23s08_driver_data *data;
0b7bb77f	566	int status, type;
8f1cc3b1 DB	567	unsigned base;
8f1cc3b1 DB	568
0b7bb77f PK	569	type = spi_get_device_id(spi)->driver_data;
0b7bb77f PK	570
8f1cc3b1	571	pdata = spi->dev.platform_data;
a342d215 BD	572	if (!pdata \|\| !gpio_is_valid(pdata->base)) {
	573	dev_dbg(&spi->dev, "invalid or missing platform data\n");
	574	return -EINVAL;
	575	}
8f1cc3b1	576
0b7bb77f	577	for (addr = 0; addr < ARRAY_SIZE(pdata->chip); addr++) {
8f1cc3b1 DB	578	if (!pdata->chip[addr].is_present)
	579	continue;
	580	chips++;
0b7bb77f PK	581	if ((type == MCP_TYPE_S08) && (addr > 3)) {
	582	dev_err(&spi->dev,
	583	"mcp23s08 only supports address 0..3\n");
	584	return -EINVAL;
	585	}
8f1cc3b1 DB	586	}
	587	if (!chips)
	588	return -ENODEV;
	589
	590	data = kzalloc(sizeof data + chips sizeof(struct mcp23s08),
	591	GFP_KERNEL);
	592	if (!data)
	593	return -ENOMEM;
	594	spi_set_drvdata(spi, data);
	595
	596	base = pdata->base;
0b7bb77f	597	for (addr = 0; addr < ARRAY_SIZE(pdata->chip); addr++) {
8f1cc3b1 DB	598	if (!pdata->chip[addr].is_present)
	599	continue;
	600	chips--;
	601	data->mcp[addr] = &data->chip[chips];
d62b98f3 PK	602	status = mcp23s08_probe_one(data->mcp[addr], &spi->dev, spi,
d62b98f3 PK	603	0x40 \| (addr << 1), type, base,
0b7bb77f	604	pdata->chip[addr].pullups);
8f1cc3b1 DB	605	if (status < 0)
8f1cc3b1 DB	606	goto fail;
0b7bb77f PK	607
0b7bb77f PK	608	base += (type == MCP_TYPE_S17) ? 16 : 8;
8f1cc3b1 DB	609	}
8f1cc3b1 DB	610	data->ngpio = base - pdata->base;
e58b9e27 DB	611
	612	/* NOTE: these chips have a relatively sane IRQ framework, with
	613	* per-signal masking and level/edge triggering. It's not yet
	614	* handled here...
	615	*/
	616
e58b9e27 DB	617	return 0;
	618
	619	fail:
0b7bb77f	620	for (addr = 0; addr < ARRAY_SIZE(data->mcp); addr++) {
8f1cc3b1 DB	621	int tmp;
	622
	623	if (!data->mcp[addr])
	624	continue;
	625	tmp = gpiochip_remove(&data->mcp[addr]->chip);
	626	if (tmp < 0)
	627	dev_err(&spi->dev, "%s --> %d\n", "remove", tmp);
	628	}
	629	kfree(data);
e58b9e27 DB	630	return status;
	631	}
	632
	633	static int mcp23s08_remove(struct spi_device *spi)
	634	{
8f1cc3b1	635	struct mcp23s08_driver_data *data = spi_get_drvdata(spi);
8f1cc3b1	636	unsigned addr;
e58b9e27 DB	637	int status = 0;
e58b9e27 DB	638
0b7bb77f	639	for (addr = 0; addr < ARRAY_SIZE(data->mcp); addr++) {
8f1cc3b1 DB	640	int tmp;
	641
	642	if (!data->mcp[addr])
	643	continue;
	644
	645	tmp = gpiochip_remove(&data->mcp[addr]->chip);
	646	if (tmp < 0) {
	647	dev_err(&spi->dev, "%s --> %d\n", "remove", tmp);
	648	status = tmp;
	649	}
	650	}
e58b9e27	651	if (status == 0)
8f1cc3b1	652	kfree(data);
e58b9e27 DB	653	return status;
	654	}
	655
0b7bb77f PK	656	static const struct spi_device_id mcp23s08_ids[] = {
	657	{ "mcp23s08", MCP_TYPE_S08 },
	658	{ "mcp23s17", MCP_TYPE_S17 },
	659	{ },
	660	};
	661	MODULE_DEVICE_TABLE(spi, mcp23s08_ids);
	662
e58b9e27 DB	663	static struct spi_driver mcp23s08_driver = {
	664	.probe = mcp23s08_probe,
	665	.remove = mcp23s08_remove,
0b7bb77f	666	.id_table = mcp23s08_ids,
e58b9e27 DB	667	.driver = {
	668	.name = "mcp23s08",
	669	.owner = THIS_MODULE,
	670	},
	671	};
	672
d62b98f3 PK	673	static int __init mcp23s08_spi_init(void)
	674	{
	675	return spi_register_driver(&mcp23s08_driver);
	676	}
	677
	678	static void mcp23s08_spi_exit(void)
	679	{
	680	spi_unregister_driver(&mcp23s08_driver);
	681	}
	682
	683	#else
	684
	685	static int __init mcp23s08_spi_init(void) { return 0; }
	686	static void mcp23s08_spi_exit(void) { }
	687
	688	#endif /* CONFIG_SPI_MASTER */
	689
e58b9e27 DB	690	/----------------------------------------------------------------------/
	691
	692	static int __init mcp23s08_init(void)
	693	{
752ad5e8 PK	694	int ret;
	695
	696	ret = mcp23s08_spi_init();
	697	if (ret)
	698	goto spi_fail;
	699
	700	ret = mcp23s08_i2c_init();
	701	if (ret)
	702	goto i2c_fail;
	703
	704	return 0;
	705
	706	i2c_fail:
	707	mcp23s08_spi_exit();
	708	spi_fail:
	709	return ret;
e58b9e27	710	}
752ad5e8	711	/* register after spi/i2c postcore initcall and before
673c0c00 DB	712	* subsys initcalls that may rely on these GPIOs
	713	*/
	714	subsys_initcall(mcp23s08_init);
e58b9e27 DB	715
	716	static void __exit mcp23s08_exit(void)
	717	{
d62b98f3	718	mcp23s08_spi_exit();
752ad5e8	719	mcp23s08_i2c_exit();
e58b9e27 DB	720	}
	721	module_exit(mcp23s08_exit);
	722
	723	MODULE_LICENSE("GPL");