cregit-Linux how code gets into the kernel

Release 4.11 drivers/gpio/gpio-mcp23s08.c

Directory: drivers/gpio
/*
 * MCP23S08 SPI/I2C GPIO gpio expander driver
 *
 * The inputs and outputs of the mcp23s08, mcp23s17, mcp23008 and mcp23017 are
 * supported.
 * For the I2C versions of the chips (mcp23008 and mcp23017) generation of
 * interrupts is also supported.
 * The hardware of the SPI versions of the chips (mcp23s08 and mcp23s17) is
 * also capable of generating interrupts, but the linux driver does not
 * support that yet.
 */

#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/mutex.h>
#include <linux/module.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>
#include <linux/interrupt.h>
#include <linux/of_irq.h>
#include <linux/of_device.h>
#include <linux/regmap.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

#define MCP_TYPE_S18    4

/* 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_MIRROR	(1 << 6)

#	define IOCON_SEQOP	(1 << 5)

#	define IOCON_HAEN	(1 << 3)

#	define IOCON_ODR	(1 << 2)

#	define IOCON_INTPOL	(1 << 1)

#	define IOCON_INTCC	(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 {
	
u8			addr;
	
bool			irq_active_high;
	
bool			reg_shift;

	
u16			cache[11];
	
u16			irq_rise;
	
u16			irq_fall;
	
int			irq;
	
bool			irq_controller;
	/* lock protects the cached values */
	
struct mutex		lock;
	
struct mutex		irq_lock;

	
struct gpio_chip	chip;

	
struct regmap		*regmap;
	
struct device		*dev;
};


static const struct regmap_config mcp23x08_regmap = {
	.reg_bits = 8,
	.val_bits = 8,

	.reg_stride = 1,
	.max_register = MCP_OLAT,
};


static const struct regmap_config mcp23x17_regmap = {
	.reg_bits = 8,
	.val_bits = 16,

	.reg_stride = 2,
	.max_register = MCP_OLAT << 1,
	.val_format_endian = REGMAP_ENDIAN_LITTLE,
};

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

#ifdef CONFIG_SPI_MASTER




static int mcp23sxx_spi_write(void *context, const void *data, size_t count)
{
	struct mcp23s08 *mcp = context;
	struct spi_device *spi = to_spi_device(mcp->dev);
	struct spi_message m;
	struct spi_transfer t[2] = { { .tx_buf = &mcp->addr, .len = 1, },
				     { .tx_buf = data, .len = count, }, };

	spi_message_init(&m);
	spi_message_add_tail(&t[0], &m);
	spi_message_add_tail(&t[1], &m);

	return spi_sync(spi, &m);
}


Contributors
PersonTokensPropCommitsCommitProp
Sebastian Reichel9581.90%150.00%


Peter Korsgaard2118.10%150.00%


Total116100.00%2100.00%






static int mcp23sxx_spi_gather_write(void *context,
				const void *reg, size_t reg_size,
				const void *val, size_t val_size)
{
	struct mcp23s08 *mcp = context;
	struct spi_device *spi = to_spi_device(mcp->dev);
	struct spi_message m;
	struct spi_transfer t[3] = { { .tx_buf = &mcp->addr, .len = 1, },
				     { .tx_buf = reg, .len = reg_size, },
				     { .tx_buf = val, .len = val_size, }, };

	spi_message_init(&m);
	spi_message_add_tail(&t[0], &m);
	spi_message_add_tail(&t[1], &m);
	spi_message_add_tail(&t[2], &m);

	return spi_sync(spi, &m);
}


Contributors
PersonTokensPropCommitsCommitProp
Sebastian Reichel13490.54%150.00%


Peter Korsgaard149.46%150.00%


Total148100.00%2100.00%






static int mcp23sxx_spi_read(void *context, const void *reg, size_t reg_size,
				void *val, size_t val_size)
{
	struct mcp23s08 *mcp = context;
	struct spi_device *spi = to_spi_device(mcp->dev);
	u8 tx[2];

	if (reg_size != 1)
		return -EINVAL;

	tx[0] = mcp->addr | 0x01;
	tx[1] = *((u8 *) reg);

	return spi_write_then_read(spi, tx, sizeof(tx), val, val_size);
}


Contributors
PersonTokensPropCommitsCommitProp
Sebastian Reichel8987.25%150.00%


Peter Korsgaard1312.75%150.00%


Total102100.00%2100.00%




static const struct regmap_bus mcp23sxx_spi_regmap = {
	.write = mcp23sxx_spi_write,
	.gather_write = mcp23sxx_spi_gather_write,
	.read = mcp23sxx_spi_read,
};

#endif /* CONFIG_SPI_MASTER */




static int mcp_read(struct mcp23s08 *mcp, unsigned int reg, unsigned int *val)
{
	return regmap_read(mcp->regmap, reg << mcp->reg_shift, val);
}


Contributors
PersonTokensPropCommitsCommitProp
Peter Korsgaard2261.11%150.00%


Sebastian Reichel1438.89%150.00%


Total36100.00%2100.00%






static int mcp_write(struct mcp23s08 *mcp, unsigned int reg, unsigned int val)
{
	return regmap_write(mcp->regmap, reg << mcp->reg_shift, val);
}


Contributors
PersonTokensPropCommitsCommitProp
Peter Korsgaard2777.14%150.00%


Sebastian Reichel822.86%150.00%


Total35100.00%2100.00%






static int mcp_update_cache(struct mcp23s08 *mcp)
{
	int ret, reg, i;

	for (i = 0; i < ARRAY_SIZE(mcp->cache); i++) {
		ret = mcp_read(mcp, i, &reg);
		if (ret < 0)
			return ret;
		mcp->cache[i] = reg;
	}

	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Peter Korsgaard3752.11%250.00%


Sebastian Reichel3346.48%125.00%


Gary Servin11.41%125.00%


Total71100.00%4100.00%



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

/* 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[];
};





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

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


Contributors
PersonTokensPropCommitsCommitProp
David Brownell7397.33%133.33%


Sebastian Reichel11.33%133.33%


Linus Walleij11.33%133.33%


Total75100.00%3100.00%






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

	mutex_lock(&mcp->lock);

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


Contributors
PersonTokensPropCommitsCommitProp
David Brownell8890.72%133.33%


Sebastian Reichel88.25%133.33%


Linus Walleij11.03%133.33%


Total97100.00%3100.00%






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_write(mcp, MCP_OLAT, olat);
}


Contributors
PersonTokensPropCommitsCommitProp
David Brownell5896.67%133.33%


Peter Korsgaard11.67%133.33%


Sebastian Reichel11.67%133.33%


Total60100.00%3100.00%






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

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


Contributors
PersonTokensPropCommitsCommitProp
David Brownell5796.61%133.33%


Peter Korsgaard11.69%133.33%


Linus Walleij11.69%133.33%


Total59100.00%3100.00%





static int

mcp23s08_direction_output(struct gpio_chip *chip, unsigned offset, int value)
{
	struct mcp23s08	*mcp = gpiochip_get_data(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_write(mcp, MCP_IODIR, mcp->cache[MCP_IODIR]);
	}
	mutex_unlock(&mcp->lock);
	return status;
}


Contributors
PersonTokensPropCommitsCommitProp
David Brownell9897.03%125.00%


Linus Walleij10.99%125.00%


Peter Korsgaard10.99%125.00%


Sebastian Reichel10.99%125.00%


Total101100.00%4100.00%



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



static irqreturn_t mcp23s08_irq(int irq, void *data)
{
	struct mcp23s08 *mcp = data;
	int intcap, intf, i, gpio, gpio_orig, intcap_mask;
	unsigned int child_irq;
	bool intf_set, intcap_changed, gpio_bit_changed,
		defval_changed, gpio_set;

	mutex_lock(&mcp->lock);
	if (mcp_read(mcp, MCP_INTF, &intf) < 0) {
		mutex_unlock(&mcp->lock);
		return IRQ_HANDLED;
	}

	mcp->cache[MCP_INTF] = intf;

	if (mcp_read(mcp, MCP_INTCAP, &intcap) < 0) {
		mutex_unlock(&mcp->lock);
		return IRQ_HANDLED;
	}

	mcp->cache[MCP_INTCAP] = intcap;

	/* This clears the interrupt(configurable on S18) */
	if (mcp_read(mcp, MCP_GPIO, &gpio) < 0) {
		mutex_unlock(&mcp->lock);
		return IRQ_HANDLED;
	}
	gpio_orig = mcp->cache[MCP_GPIO];
	mcp->cache[MCP_GPIO] = gpio;
	mutex_unlock(&mcp->lock);

	if (mcp->cache[MCP_INTF] == 0) {
		/* There is no interrupt pending */
		return IRQ_HANDLED;
	}

	dev_dbg(mcp->chip.parent,
		"intcap 0x%04X intf 0x%04X gpio_orig 0x%04X gpio 0x%04X\n",
		intcap, intf, gpio_orig, gpio);

	for (i = 0; i < mcp->chip.ngpio; i++) {
		/* We must check all of the inputs on the chip,
                 * otherwise we may not notice a change on >=2 pins.
                 *
                 * On at least the mcp23s17, INTCAP is only updated
                 * one byte at a time(INTCAPA and INTCAPB are
                 * not written to at the same time - only on a per-bank
                 * basis).
                 *
                 * INTF only contains the single bit that caused the
                 * interrupt per-bank.  On the mcp23s17, there is
                 * INTFA and INTFB.  If two pins are changed on the A
                 * side at the same time, INTF will only have one bit
                 * set.  If one pin on the A side and one pin on the B
                 * side are changed at the same time, INTF will have
                 * two bits set.  Thus, INTF can't be the only check
                 * to see if the input has changed.
                 */

		intf_set = BIT(i) & mcp->cache[MCP_INTF];
		if (i < 8 && intf_set)
			intcap_mask = 0x00FF;
		else if (i >= 8 && intf_set)
			intcap_mask = 0xFF00;
		else
			intcap_mask = 0x00;

		intcap_changed = (intcap_mask &
			(BIT(i) & mcp->cache[MCP_INTCAP])) !=
			(intcap_mask & (BIT(i) & gpio_orig));
		gpio_set = BIT(i) & mcp->cache[MCP_GPIO];
		gpio_bit_changed = (BIT(i) & gpio_orig) !=
			(BIT(i) & mcp->cache[MCP_GPIO]);
		defval_changed = (BIT(i) & mcp->cache[MCP_INTCON]) &&
			((BIT(i) & mcp->cache[MCP_GPIO]) !=
			(BIT(i) & mcp->cache[MCP_DEFVAL]));

		if (((gpio_bit_changed || intcap_changed) &&
			(BIT(i) & mcp->irq_rise) && gpio_set) ||
		    ((gpio_bit_changed || intcap_changed) &&
			(BIT(i) & mcp->irq_fall) && !gpio_set) ||
		    defval_changed) {
			child_irq = irq_find_mapping(mcp->chip.irqdomain, i);
			handle_nested_irq(child_irq);
		}
	}

	return IRQ_HANDLED;
}


Contributors
PersonTokensPropCommitsCommitProp
Robert Middleton26155.53%112.50%


Lars Poeschel11424.26%112.50%


David Brownell6513.83%112.50%


Sebastian Reichel122.55%112.50%


Alexander Stein122.55%112.50%


Phil Reid30.64%112.50%


Peter Korsgaard20.43%112.50%


Roel Kluin10.21%112.50%


Total470100.00%8100.00%






static void mcp23s08_irq_mask(struct irq_data *data)
{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(data);
	struct mcp23s08 *mcp = gpiochip_get_data(gc);
	unsigned int pos = data->hwirq;

	mcp->cache[MCP_GPINTEN] &= ~BIT(pos);
}


Contributors
PersonTokensPropCommitsCommitProp
Lars Poeschel4280.77%150.00%


Phil Reid1019.23%150.00%


Total52100.00%2100.00%






static void mcp23s08_irq_unmask(struct irq_data *data)
{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(data);
	struct mcp23s08 *mcp = gpiochip_get_data(gc);
	unsigned int pos = data->hwirq;

	mcp->cache[MCP_GPINTEN] |= BIT(pos);
}


Contributors
PersonTokensPropCommitsCommitProp
Lars Poeschel3976.47%150.00%


Phil Reid1223.53%150.00%


Total51100.00%2100.00%






static int mcp23s08_irq_set_type(struct irq_data *data, unsigned int type)
{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(data);
	struct mcp23s08 *mcp = gpiochip_get_data(gc);
	unsigned int pos = data->hwirq;
	int status = 0;

	if ((type & IRQ_TYPE_EDGE_BOTH) == IRQ_TYPE_EDGE_BOTH) {
		mcp->cache[MCP_INTCON] &= ~BIT(pos);
		mcp->irq_rise |= BIT(pos);
		mcp->irq_fall |= BIT(pos);
	} else if (type & IRQ_TYPE_EDGE_RISING) {
		mcp->cache[MCP_INTCON] &= ~BIT(pos);
		mcp->irq_rise |= BIT(pos);
		mcp->irq_fall &= ~BIT(pos);
	} else if (type & IRQ_TYPE_EDGE_FALLING) {
		mcp->cache[MCP_INTCON] &= ~BIT(pos);
		mcp->irq_rise &= ~BIT(pos);
		mcp->irq_fall |= BIT(pos);
	} else if (type & IRQ_TYPE_LEVEL_HIGH) {
		mcp->cache[MCP_INTCON] |= BIT(pos);
		mcp->cache[MCP_DEFVAL] &= ~BIT(pos);
	} else if (type & IRQ_TYPE_LEVEL_LOW) {
		mcp->cache[MCP_INTCON] |= BIT(pos);
		mcp->cache[MCP_DEFVAL] |= BIT(pos);
	} else
		return -EINVAL;

	return status;
}


Contributors
PersonTokensPropCommitsCommitProp
Lars Poeschel16968.15%133.33%


Alexander Stein6727.02%133.33%


Phil Reid124.84%133.33%


Total248100.00%3100.00%






static void mcp23s08_irq_bus_lock(struct irq_data *data)
{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(data);
	struct mcp23s08 *mcp = gpiochip_get_data(gc);

	mutex_lock(&mcp->irq_lock);
}


Contributors
PersonTokensPropCommitsCommitProp
Lars Poeschel2769.23%150.00%


Phil Reid1230.77%150.00%


Total39100.00%2100.00%






static void mcp23s08_irq_bus_unlock(struct irq_data *data)
{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(data);
	struct mcp23s08 *mcp = gpiochip_get_data(gc);

	mutex_lock(&mcp->lock);
	mcp_write(mcp, MCP_GPINTEN, mcp->cache[MCP_GPINTEN]);
	mcp_write(mcp, MCP_DEFVAL, mcp->cache[MCP_DEFVAL]);
	mcp_write(mcp, MCP_INTCON, mcp->cache[MCP_INTCON]);
	mutex_unlock(&mcp->lock);
	mutex_unlock(&mcp->irq_lock);
}


Contributors
PersonTokensPropCommitsCommitProp
Lars Poeschel8284.54%133.33%


Phil Reid1212.37%133.33%


Sebastian Reichel33.09%133.33%


Total97100.00%3100.00%




static struct irq_chip mcp23s08_irq_chip = {
	.name = "gpio-mcp23xxx",
	.irq_mask = mcp23s08_irq_mask,
	.irq_unmask = mcp23s08_irq_unmask,
	.irq_set_type = mcp23s08_irq_set_type,
	.irq_bus_lock = mcp23s08_irq_bus_lock,
	.irq_bus_sync_unlock = mcp23s08_irq_bus_unlock,
};




static int mcp23s08_irq_setup(struct mcp23s08 *mcp)
{
	struct gpio_chip *chip = &mcp->chip;
	int err;
	unsigned long irqflags = IRQF_ONESHOT | IRQF_SHARED;

	mutex_init(&mcp->irq_lock);

	if (mcp->irq_active_high)
		irqflags |= IRQF_TRIGGER_HIGH;
	else
		irqflags |= IRQF_TRIGGER_LOW;

	err = devm_request_threaded_irq(chip->parent, mcp->irq, NULL,
					mcp23s08_irq,
					irqflags, dev_name(chip->parent), mcp);
	if (err != 0) {
		dev_err(chip->parent, "unable to request IRQ#%d: %d\n",
			mcp->irq, err);
		return err;
	}

	err =  gpiochip_irqchip_add_nested(chip,
					   &mcp23s08_irq_chip,
					   0,
					   handle_simple_irq,
					   IRQ_TYPE_NONE);
	if (err) {
		dev_err(chip->parent,
			"could not connect irqchip to gpiochip: %d\n", err);
		return err;
	}

	gpiochip_set_nested_irqchip(chip,
				    &mcp23s08_irq_chip,
				    mcp->irq);

	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Lars Poeschel10465.00%120.00%


Phil Reid2716.88%120.00%


Alexander Stein2415.00%120.00%


Linus Walleij53.12%240.00%


Total160100.00%5100.00%



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

#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 = gpiochip_get_data(chip);

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

	mutex_lock(&mcp->lock);
	t = mcp_update_cache(mcp);
	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_puts(s, "\n");
	}
done:
	mutex_unlock(&mcp->lock);
}


Contributors
PersonTokensPropCommitsCommitProp
Lars Poeschel18786.57%116.67%


David Brownell2411.11%116.67%


Peter Korsgaard20.93%116.67%


Sebastian Reichel10.46%116.67%


Linus Walleij10.46%116.67%


Gary Servin10.46%116.67%


Total216100.00%6100.00%



#else

#define mcp23s08_dbg_show	NULL
#endif

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




static int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev,
			      void *data, unsigned addr, unsigned type,
			      struct mcp23s08_platform_data *pdata, int cs)
{
	int status, ret;
	bool mirror = false;

	mutex_init(&mcp->lock);

	mcp->dev = dev;
	mcp->addr = addr;
	mcp->irq_active_high = false;

	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;
#ifdef CONFIG_OF_GPIO
	mcp->chip.of_gpio_n_cells = 2;
	mcp->chip.of_node = dev->of_node;
#endif

	switch (type) {
#ifdef CONFIG_SPI_MASTER
	case MCP_TYPE_S08:
		mcp->regmap = devm_regmap_init(dev, &mcp23sxx_spi_regmap, mcp,
					       &mcp23x08_regmap);
		mcp->reg_shift = 0;
		mcp->chip.ngpio = 8;
		mcp->chip.label = "mcp23s08";
		break;

	case MCP_TYPE_S17:
		mcp->regmap = devm_regmap_init(dev, &mcp23sxx_spi_regmap, mcp,
					       &mcp23x17_regmap);
		mcp->reg_shift = 1;
		mcp->chip.ngpio = 16;
		mcp->chip.label = "mcp23s17";
		break;

	case MCP_TYPE_S18:
		mcp->regmap = devm_regmap_init(dev, &mcp23sxx_spi_regmap, mcp,
					       &mcp23x17_regmap);
		mcp->reg_shift = 1;
		mcp->chip.ngpio = 16;
		mcp->chip.label = "mcp23s18";
		break;
#endif /* CONFIG_SPI_MASTER */

#if IS_ENABLED(CONFIG_I2C)
	case MCP_TYPE_008:
		mcp->regmap = devm_regmap_init_i2c(data, &mcp23x08_regmap);
		mcp->reg_shift = 0;
		mcp->chip.ngpio = 8;
		mcp->chip.label = "mcp23008";
		break;

	case MCP_TYPE_017:
		mcp->regmap = devm_regmap_init_i2c(data, &mcp23x17_regmap);
		mcp->reg_shift = 1;
		mcp->chip.ngpio = 16;
		mcp->chip.label = "mcp23017";
		break;
#endif /* CONFIG_I2C */

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

	if (IS_ERR(mcp->regmap))
		return PTR_ERR(mcp->regmap);

	mcp->chip.base = pdata->base;
	mcp->chip.can_sleep = true;
	mcp->chip.parent = 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.
         */

	ret = mcp_read(mcp, MCP_IOCON, &status);
	if (ret < 0)
		goto fail;

	mcp->irq_controller = pdata->irq_controller;
	if (mcp->irq && mcp->irq_controller) {
		mcp->irq_active_high =
			of_property_read_bool(mcp->chip.parent->of_node,
					      "microchip,irq-active-high");

		mirror = pdata->mirror;
	}

	if ((status & IOCON_SEQOP) || !(status & IOCON_HAEN) || mirror ||
	     mcp->irq_active_high) {
		/* mcp23s17 has IOCON twice, make sure they are in sync */
		status &= ~(IOCON_SEQOP | (IOCON_SEQOP << 8));
		status |= IOCON_HAEN | (IOCON_HAEN << 8);
		if (mcp->irq_active_high)
			status |= IOCON_INTPOL | (IOCON_INTPOL << 8);
		else
			status &= ~(IOCON_INTPOL | (IOCON_INTPOL << 8));

		if (mirror)
			status |= IOCON_MIRROR | (IOCON_MIRROR << 8);

		if (type == MCP_TYPE_S18)
			status |= IOCON_INTCC | (IOCON_INTCC << 8);

		ret = mcp_write(mcp, MCP_IOCON, status);
		if (ret < 0)
			goto fail;
	}

	/* configure ~100K pullups */
	ret = mcp_write(mcp, MCP_GPPU, pdata->chip[cs].pullups);
	if (ret < 0)
		goto fail;

	ret = mcp_update_cache(mcp);
	if (ret < 0)
		goto fail;

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

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

	ret = gpiochip_add_data(&mcp->chip, mcp);
	if (ret < 0)
		goto fail;

	if (mcp->irq && mcp->irq_controller) {
		ret = mcp23s08_irq_setup(mcp);
		if (ret)
			goto fail;
	}
fail:
	if (ret < 0)
		dev_dbg(dev, "can't setup chip %d, --> %d\n", addr, ret);
	return ret;
}


Contributors
PersonTokensPropCommitsCommitProp
Peter Korsgaard24830.43%315.00%


David Brownell20625.28%315.00%


Sebastian Reichel12915.83%15.00%


Lars Poeschel10613.01%210.00%


Alexander Stein455.52%15.00%


Phil Reid415.03%210.00%


Sonic Zhang192.33%15.00%


Guennadi Liakhovetski80.98%15.00%


Linus Walleij80.98%525.00%


Daniel M. Weeks50.61%15.00%


Total815100.00%20100.00%



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

#ifdef CONFIG_OF
#ifdef CONFIG_SPI_MASTER

static const struct of_device_id mcp23s08_spi_of_match[] = {
	{
		.compatible = "microchip,mcp23s08",
		.data = (void *) MCP_TYPE_S08,
        },
	{
		.compatible = "microchip,mcp23s17",
		.data = (void *) MCP_TYPE_S17,
        },
	{
		.compatible = "microchip,mcp23s18",
		.data = (void *) MCP_TYPE_S18,
        },
/* NOTE: The use of the mcp prefix is deprecated and will be removed. */
	{
		.compatible = "mcp,mcp23s08",
		.data = (void *) MCP_TYPE_S08,
        },
	{
		.compatible = "mcp,mcp23s17",
		.data = (void *) MCP_TYPE_S17,
        },
	{ },
};
MODULE_DEVICE_TABLE(of, mcp23s08_spi_of_match);
#endif

#if IS_ENABLED(CONFIG_I2C)

static const struct of_device_id mcp23s08_i2c_of_match[] = {
	{
		.compatible = "microchip,mcp23008",
		.data = (void *) MCP_TYPE_008,
        },
	{
		.compatible = "microchip,mcp23017",
		.data = (void *) MCP_TYPE_017,
        },
/* NOTE: The use of the mcp prefix is deprecated and will be removed. */
	{
		.compatible = "mcp,mcp23008",
		.data = (void *) MCP_TYPE_008,
        },
	{
		.compatible = "mcp,mcp23017",
		.data = (void *) MCP_TYPE_017,
        },
	{ },
};
MODULE_DEVICE_TABLE(of, mcp23s08_i2c_of_match);
#endif
#endif /* CONFIG_OF */


#if IS_ENABLED(CONFIG_I2C)




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

	match = of_match_device(of_match_ptr(mcp23s08_i2c_of_match),
					&client->dev);
	if (match) {
		pdata = &local_pdata;
		pdata->base = -1;
		pdata->chip[0].pullups = 0;
		pdata->irq_controller =	of_property_read_bool(
					client->dev.of_node,
					"interrupt-controller");
		pdata->mirror = of_property_read_bool(client->dev.of_node,
						      "microchip,irq-mirror");
		client->irq = irq_of_parse_and_map(client->dev.of_node, 0);
	} else {
		pdata = dev_get_platdata(&client->dev);
		if (!pdata) {
			pdata = devm_kzalloc(&client->dev,
					sizeof(struct mcp23s08_platform_data),
					GFP_KERNEL);
			if (!pdata)
				return -ENOMEM;
			pdata->base = -1;
		}
	}

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

	mcp->irq = client->irq;
	status = mcp23s08_probe_one(mcp, &client->dev, client, client->addr,
				    id->driver_data, pdata, 0);
	if (status)
		goto fail;

	i2c_set_clientdata(client, mcp);

	return 0;

fail:
	kfree(mcp);

	return status;
}


Contributors
PersonTokensPropCommitsCommitProp
Peter Korsgaard9837.12%220.00%


Sonic Zhang7528.41%220.00%


Lars Poeschel6223.48%220.00%


David Brownell176.44%220.00%


Insu Yun93.41%110.00%


Gary Servin31.14%110.00%


Total264100.00%10100.00%






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

	gpiochip_remove(&mcp->chip);
	kfree(mcp);

	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Peter Korsgaard2362.16%125.00%


David Brownell1335.14%250.00%


abdoulaye berthe12.70%125.00%


Total37100.00%4100.00%




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",
		.of_match_table = of_match_ptr(mcp23s08_i2c_of_match),
        },
	.probe		= mcp230xx_probe,
	.remove		= mcp230xx_remove,
	.id_table	= mcp230xx_id,
};




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


Contributors
PersonTokensPropCommitsCommitProp
Peter Korsgaard16100.00%1100.00%


Total16100.00%1100.00%






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


Contributors
PersonTokensPropCommitsCommitProp
Peter Korsgaard14100.00%1100.00%


Total14100.00%1100.00%



#else




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

Contributors
PersonTokensPropCommitsCommitProp
Peter Korsgaard12100.00%1100.00%


Total12100.00%1100.00%






static void mcp23s08_i2c_exit(void) { }


Contributors
PersonTokensPropCommitsCommitProp
Peter Korsgaard7100.00%1100.00%


Total7100.00%1100.00%



#endif /* CONFIG_I2C */

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

#ifdef CONFIG_SPI_MASTER




static int mcp23s08_probe(struct spi_device *spi)
{
	struct mcp23s08_platform_data	*pdata, local_pdata;
	unsigned			addr;
	int				chips = 0;
	struct mcp23s08_driver_data	*data;
	int				status, type;
	unsigned			ngpio = 0;
	const struct			of_device_id *match;
	u32				spi_present_mask = 0;

	match = of_match_device(of_match_ptr(mcp23s08_spi_of_match), &spi->dev);
	if (match) {
		type = (int)(uintptr_t)match->data;
		status = of_property_read_u32(spi->dev.of_node,
			    "microchip,spi-present-mask", &spi_present_mask);
		if (status) {
			status = of_property_read_u32(spi->dev.of_node,
				    "mcp,spi-present-mask", &spi_present_mask);
			if (status) {
				dev_err(&spi->dev,
					"DT has no spi-present-mask\n");
				return -ENODEV;
			}
		}
		if ((spi_present_mask <= 0) || (spi_present_mask >= 256)) {
			dev_err(&spi->dev, "invalid spi-present-mask\n");
			return -ENODEV;
		}

		pdata = &local_pdata;
		pdata->base = -1;
		for (addr = 0; addr < ARRAY_SIZE(pdata->chip); addr++) {
			pdata->chip[addr].pullups = 0;
			if (spi_present_mask & (1 << addr))
				chips++;
		}
		pdata->irq_controller =	of_property_read_bool(
					spi->dev.of_node,
					"interrupt-controller");
		pdata->mirror = of_property_read_bool(spi->dev.of_node,
						      "microchip,irq-mirror");
	} else {
		type = spi_get_device_id(spi)->driver_data;
		pdata = dev_get_platdata(&spi->dev);
		if (!pdata) {
			pdata = devm_kzalloc(&spi->dev,
					sizeof(struct mcp23s08_platform_data),
					GFP_KERNEL);
			pdata->base = -1;
		}

		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;
			}
			spi_present_mask |= 1 << addr;
		}
	}

	if (!chips)
		return -ENODEV;

	data = devm_kzalloc(&spi->dev,
			    sizeof(*data) + chips * sizeof(struct mcp23s08),
			    GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	spi_set_drvdata(spi, data);

	spi->irq = irq_of_parse_and_map(spi->dev.of_node, 0);

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

		if (pdata->base != -1)
			pdata->base += data->mcp[addr]->chip.ngpio;
		ngpio += data->mcp[addr]->chip.ngpio;
	}
	data->ngpio = ngpio;

	/* 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++) {

		if (!data->mcp[addr])
			continue;
		gpiochip_remove(&data->mcp[addr]->chip);
	}
	return status;
}


Contributors
PersonTokensPropCommitsCommitProp
David Brownell23135.32%211.76%


Lars Poeschel18327.98%211.76%


Peter Korsgaard7912.08%211.76%


Sonic Zhang7010.70%211.76%


Alexander Stein284.28%15.88%


Phil Reid203.06%15.88%


Michael Welling162.45%15.88%


Ben Dooks101.53%15.88%


Varka Bhadram60.92%15.88%


Jingoo Han40.61%15.88%


Gary Servin30.46%15.88%


SeongJae Park30.46%15.88%


Linus Walleij10.15%15.88%


Total654100.00%17100.00%






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

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

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

		gpiochip_remove(&data->mcp[addr]->chip);
	}

	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
David Brownell6490.14%250.00%


Peter Korsgaard68.45%125.00%


abdoulaye berthe11.41%125.00%


Total71100.00%4100.00%




static const struct spi_device_id mcp23s08_ids[] = {
	{ "mcp23s08", MCP_TYPE_S08 },
	{ "mcp23s17", MCP_TYPE_S17 },
	{ "mcp23s18", MCP_TYPE_S18 },
	{ },
};
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",
		.of_match_table = of_match_ptr(mcp23s08_spi_of_match),
        },
};




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


Contributors
PersonTokensPropCommitsCommitProp
David Brownell1593.75%150.00%


Peter Korsgaard16.25%150.00%


Total16100.00%2100.00%






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


Contributors
PersonTokensPropCommitsCommitProp
Peter Korsgaard14100.00%1100.00%


Total14100.00%1100.00%



#else




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

Contributors
PersonTokensPropCommitsCommitProp
Peter Korsgaard12100.00%1100.00%


Total12100.00%1100.00%






static void mcp23s08_spi_exit(void) { }


Contributors
PersonTokensPropCommitsCommitProp
Peter Korsgaard7100.00%1100.00%


Total7100.00%1100.00%



#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;
}

Contributors
PersonTokensPropCommitsCommitProp
Peter Korsgaard49100.00%2100.00%


Total49100.00%2100.00%



/* 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();
}

Contributors
PersonTokensPropCommitsCommitProp
David Brownell1066.67%133.33%


Peter Korsgaard533.33%266.67%


Total15100.00%3100.00%




module_exit(mcp23s08_exit);

MODULE_LICENSE("GPL");

Overall Contributors
PersonTokensPropCommitsCommitProp
Lars Poeschel138527.79%36.98%


David Brownell115523.17%49.30%


Peter Korsgaard91218.30%49.30%


Sebastian Reichel64212.88%12.33%


Robert Middleton2615.24%12.33%


Alexander Stein1793.59%36.98%


Phil Reid1793.59%36.98%


Sonic Zhang1643.29%24.65%


Linus Walleij190.38%716.28%


Michael Welling160.32%12.33%


Ben Dooks100.20%12.33%


Daniel M. Weeks100.20%12.33%


Insu Yun90.18%12.33%


Guennadi Liakhovetski80.16%12.33%


Gary Servin80.16%12.33%


Varka Bhadram60.12%12.33%


Jingoo Han60.12%24.65%


SeongJae Park30.06%12.33%


H Hartley Sweeten30.06%12.33%


Tejun Heo30.06%12.33%


Paul Gortmaker30.06%12.33%


abdoulaye berthe20.04%12.33%


Roel Kluin10.02%12.33%


Total4984100.00%43100.00%


Directory: drivers/gpio



Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.