[linux-2.6-block.git] / drivers / gpio / gpio-adp5588.c

/*
 * GPIO Chip driver for Analog Devices
 * ADP5588/ADP5587 I/O Expander and QWERTY Keypad Controller
 *
 * Copyright 2009-2010 Analog Devices Inc.
 *
 * Licensed under the GPL-2 or later.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/gpio/driver.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/of_device.h>

#include <linux/platform_data/adp5588.h>

#define DRV_NAME	"adp5588-gpio"

/*
 * Early pre 4.0 Silicon required to delay readout by at least 25ms,
 * since the Event Counter Register updated 25ms after the interrupt
 * asserted.
 */
#define WA_DELAYED_READOUT_REVID(rev)	((rev) < 4)

struct adp5588_gpio {
	struct i2c_client *client;
	struct gpio_chip gpio_chip;
	struct mutex lock;	/* protect cached dir, dat_out */
	/* protect serialized access to the interrupt controller bus */
	struct mutex irq_lock;
	uint8_t dat_out[3];
	uint8_t dir[3];
	uint8_t int_lvl[3];
	uint8_t int_en[3];
	uint8_t irq_mask[3];
	uint8_t irq_stat[3];
	uint8_t int_input_en[3];
	uint8_t int_lvl_cached[3];
};

static int adp5588_gpio_read(struct i2c_client *client, u8 reg)
{
	int ret = i2c_smbus_read_byte_data(client, reg);

	if (ret < 0)
		dev_err(&client->dev, "Read Error\n");

	return ret;
}

static int adp5588_gpio_write(struct i2c_client *client, u8 reg, u8 val)
{
	int ret = i2c_smbus_write_byte_data(client, reg, val);

	if (ret < 0)
		dev_err(&client->dev, "Write Error\n");

	return ret;
}

static int adp5588_gpio_get_value(struct gpio_chip *chip, unsigned off)
{
	struct adp5588_gpio *dev = gpiochip_get_data(chip);
	unsigned bank = ADP5588_BANK(off);
	unsigned bit = ADP5588_BIT(off);
	int val;

	mutex_lock(&dev->lock);

	if (dev->dir[bank] & bit)
		val = dev->dat_out[bank];
	else
		val = adp5588_gpio_read(dev->client, GPIO_DAT_STAT1 + bank);

	mutex_unlock(&dev->lock);

	return !!(val & bit);
}

static void adp5588_gpio_set_value(struct gpio_chip *chip,
				   unsigned off, int val)
{
	unsigned bank, bit;
	struct adp5588_gpio *dev = gpiochip_get_data(chip);

	bank = ADP5588_BANK(off);
	bit = ADP5588_BIT(off);

	mutex_lock(&dev->lock);
	if (val)
		dev->dat_out[bank] |= bit;
	else
		dev->dat_out[bank] &= ~bit;

	adp5588_gpio_write(dev->client, GPIO_DAT_OUT1 + bank,
			   dev->dat_out[bank]);
	mutex_unlock(&dev->lock);
}

static int adp5588_gpio_direction_input(struct gpio_chip *chip, unsigned off)
{
	int ret;
	unsigned bank;
	struct adp5588_gpio *dev = gpiochip_get_data(chip);

	bank = ADP5588_BANK(off);

	mutex_lock(&dev->lock);
	dev->dir[bank] &= ~ADP5588_BIT(off);
	ret = adp5588_gpio_write(dev->client, GPIO_DIR1 + bank, dev->dir[bank]);
	mutex_unlock(&dev->lock);

	return ret;
}

static int adp5588_gpio_direction_output(struct gpio_chip *chip,
					 unsigned off, int val)
{
	int ret;
	unsigned bank, bit;
	struct adp5588_gpio *dev = gpiochip_get_data(chip);

	bank = ADP5588_BANK(off);
	bit = ADP5588_BIT(off);

	mutex_lock(&dev->lock);
	dev->dir[bank] |= bit;

	if (val)
		dev->dat_out[bank] |= bit;
	else
		dev->dat_out[bank] &= ~bit;

	ret = adp5588_gpio_write(dev->client, GPIO_DAT_OUT1 + bank,
				 dev->dat_out[bank]);
	ret |= adp5588_gpio_write(dev->client, GPIO_DIR1 + bank,
				 dev->dir[bank]);
	mutex_unlock(&dev->lock);

	return ret;
}

#ifdef CONFIG_GPIO_ADP5588_IRQ

static void adp5588_irq_bus_lock(struct irq_data *d)
{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct adp5588_gpio *dev = gpiochip_get_data(gc);

	mutex_lock(&dev->irq_lock);
}

 /*
  * genirq core code can issue chip->mask/unmask from atomic context.
  * This doesn't work for slow busses where an access needs to sleep.
  * bus_sync_unlock() is therefore called outside the atomic context,
  * syncs the current irq mask state with the slow external controller
  * and unlocks the bus.
  */

static void adp5588_irq_bus_sync_unlock(struct irq_data *d)
{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct adp5588_gpio *dev = gpiochip_get_data(gc);
	int i;

	for (i = 0; i <= ADP5588_BANK(ADP5588_MAXGPIO); i++) {
		if (dev->int_input_en[i]) {
			mutex_lock(&dev->lock);
			dev->dir[i] &= ~dev->int_input_en[i];
			dev->int_input_en[i] = 0;
			adp5588_gpio_write(dev->client, GPIO_DIR1 + i,
					   dev->dir[i]);
			mutex_unlock(&dev->lock);
		}

		if (dev->int_lvl_cached[i] != dev->int_lvl[i]) {
			dev->int_lvl_cached[i] = dev->int_lvl[i];
			adp5588_gpio_write(dev->client, GPIO_INT_LVL1 + i,
					   dev->int_lvl[i]);
		}

		if (dev->int_en[i] ^ dev->irq_mask[i]) {
			dev->int_en[i] = dev->irq_mask[i];
			adp5588_gpio_write(dev->client, GPIO_INT_EN1 + i,
					   dev->int_en[i]);
		}
	}

	mutex_unlock(&dev->irq_lock);
}

static void adp5588_irq_mask(struct irq_data *d)
{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct adp5588_gpio *dev = gpiochip_get_data(gc);

	dev->irq_mask[ADP5588_BANK(d->hwirq)] &= ~ADP5588_BIT(d->hwirq);
}

static void adp5588_irq_unmask(struct irq_data *d)
{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct adp5588_gpio *dev = gpiochip_get_data(gc);

	dev->irq_mask[ADP5588_BANK(d->hwirq)] |= ADP5588_BIT(d->hwirq);
}

static int adp5588_irq_set_type(struct irq_data *d, unsigned int type)
{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct adp5588_gpio *dev = gpiochip_get_data(gc);
	uint16_t gpio = d->hwirq;
	unsigned bank, bit;

	if ((type & IRQ_TYPE_EDGE_BOTH)) {
		dev_err(&dev->client->dev, "irq %d: unsupported type %d\n",
			d->irq, type);
		return -EINVAL;
	}

	bank = ADP5588_BANK(gpio);
	bit = ADP5588_BIT(gpio);

	if (type & IRQ_TYPE_LEVEL_HIGH)
		dev->int_lvl[bank] |= bit;
	else if (type & IRQ_TYPE_LEVEL_LOW)
		dev->int_lvl[bank] &= ~bit;
	else
		return -EINVAL;

	dev->int_input_en[bank] |= bit;

	return 0;
}

static struct irq_chip adp5588_irq_chip = {
	.name			= "adp5588",
	.irq_mask		= adp5588_irq_mask,
	.irq_unmask		= adp5588_irq_unmask,
	.irq_bus_lock		= adp5588_irq_bus_lock,
	.irq_bus_sync_unlock	= adp5588_irq_bus_sync_unlock,
	.irq_set_type		= adp5588_irq_set_type,
};

static int adp5588_gpio_read_intstat(struct i2c_client *client, u8 *buf)
{
	int ret = i2c_smbus_read_i2c_block_data(client, GPIO_INT_STAT1, 3, buf);

	if (ret < 0)
		dev_err(&client->dev, "Read INT_STAT Error\n");

	return ret;
}

static irqreturn_t adp5588_irq_handler(int irq, void *devid)
{
	struct adp5588_gpio *dev = devid;
	unsigned status, bank, bit, pending;
	int ret;
	status = adp5588_gpio_read(dev->client, INT_STAT);

	if (status & ADP5588_GPI_INT) {
		ret = adp5588_gpio_read_intstat(dev->client, dev->irq_stat);
		if (ret < 0)
			memset(dev->irq_stat, 0, ARRAY_SIZE(dev->irq_stat));

		for (bank = 0, bit = 0; bank <= ADP5588_BANK(ADP5588_MAXGPIO);
			bank++, bit = 0) {
			pending = dev->irq_stat[bank] & dev->irq_mask[bank];

			while (pending) {
				if (pending & (1 << bit)) {
					handle_nested_irq(
						irq_find_mapping(
						   dev->gpio_chip.irq.domain,
						   (bank << 3) + bit));
					pending &= ~(1 << bit);
				}
				bit++;
			}
		}
	}

	adp5588_gpio_write(dev->client, INT_STAT, status); /* Status is W1C */

	return IRQ_HANDLED;
}

static int adp5588_irq_setup(struct adp5588_gpio *dev)
{
	struct i2c_client *client = dev->client;
	int ret;
	struct adp5588_gpio_platform_data *pdata =
			dev_get_platdata(&client->dev);
	int irq_base = pdata ? pdata->irq_base : 0;

	adp5588_gpio_write(client, CFG, ADP5588_AUTO_INC);
	adp5588_gpio_write(client, INT_STAT, -1); /* status is W1C */
	adp5588_gpio_read_intstat(client, dev->irq_stat); /* read to clear */

	mutex_init(&dev->irq_lock);

	ret = devm_request_threaded_irq(&client->dev, client->irq,
					NULL, adp5588_irq_handler, IRQF_ONESHOT
					| IRQF_TRIGGER_FALLING | IRQF_SHARED,
					dev_name(&client->dev), dev);
	if (ret) {
		dev_err(&client->dev, "failed to request irq %d\n",
			client->irq);
		return ret;
	}
	ret = gpiochip_irqchip_add_nested(&dev->gpio_chip,
					  &adp5588_irq_chip, irq_base,
					  handle_simple_irq,
					  IRQ_TYPE_NONE);
	if (ret) {
		dev_err(&client->dev,
			"could not connect irqchip to gpiochip\n");
		return ret;
	}
	gpiochip_set_nested_irqchip(&dev->gpio_chip,
				    &adp5588_irq_chip,
				    client->irq);

	adp5588_gpio_write(client, CFG,
		ADP5588_AUTO_INC | ADP5588_INT_CFG | ADP5588_GPI_INT);

	return 0;
}

#else
static int adp5588_irq_setup(struct adp5588_gpio *dev)
{
	struct i2c_client *client = dev->client;
	dev_warn(&client->dev, "interrupt support not compiled in\n");

	return 0;
}

#endif /* CONFIG_GPIO_ADP5588_IRQ */

static int adp5588_gpio_probe(struct i2c_client *client)
{
	struct adp5588_gpio_platform_data *pdata =
			dev_get_platdata(&client->dev);
	struct adp5588_gpio *dev;
	struct gpio_chip *gc;
	int ret, i, revid;
	unsigned int pullup_dis_mask = 0;

	if (!i2c_check_functionality(client->adapter,
					I2C_FUNC_SMBUS_BYTE_DATA)) {
		dev_err(&client->dev, "SMBUS Byte Data not Supported\n");
		return -EIO;
	}

	dev = devm_kzalloc(&client->dev, sizeof(*dev), GFP_KERNEL);
	if (!dev)
		return -ENOMEM;

	dev->client = client;

	gc = &dev->gpio_chip;
	gc->direction_input = adp5588_gpio_direction_input;
	gc->direction_output = adp5588_gpio_direction_output;
	gc->get = adp5588_gpio_get_value;
	gc->set = adp5588_gpio_set_value;
	gc->can_sleep = true;
	gc->base = -1;
	gc->parent = &client->dev;

	if (pdata) {
		gc->base = pdata->gpio_start;
		gc->names = pdata->names;
		pullup_dis_mask = pdata->pullup_dis_mask;
	}

	gc->ngpio = ADP5588_MAXGPIO;
	gc->label = client->name;
	gc->owner = THIS_MODULE;

	mutex_init(&dev->lock);

	ret = adp5588_gpio_read(dev->client, DEV_ID);
	if (ret < 0)
		return ret;

	revid = ret & ADP5588_DEVICE_ID_MASK;

	for (i = 0, ret = 0; i <= ADP5588_BANK(ADP5588_MAXGPIO); i++) {
		dev->dat_out[i] = adp5588_gpio_read(client, GPIO_DAT_OUT1 + i);
		dev->dir[i] = adp5588_gpio_read(client, GPIO_DIR1 + i);
		ret |= adp5588_gpio_write(client, KP_GPIO1 + i, 0);
		ret |= adp5588_gpio_write(client, GPIO_PULL1 + i,
				(pullup_dis_mask >> (8 * i)) & 0xFF);
		ret |= adp5588_gpio_write(client, GPIO_INT_EN1 + i, 0);
		if (ret)
			return ret;
	}

	if (client->irq) {
		if (WA_DELAYED_READOUT_REVID(revid)) {
			dev_warn(&client->dev, "GPIO int not supported\n");
		} else {
			ret = adp5588_irq_setup(dev);
			if (ret)
				return ret;
		}
	}

	ret = devm_gpiochip_add_data(&client->dev, &dev->gpio_chip, dev);
	if (ret)
		return ret;

	if (pdata && pdata->setup) {
		ret = pdata->setup(client, gc->base, gc->ngpio, pdata->context);
		if (ret < 0)
			dev_warn(&client->dev, "setup failed, %d\n", ret);
	}

	i2c_set_clientdata(client, dev);

	return 0;
}

static int adp5588_gpio_remove(struct i2c_client *client)
{
	struct adp5588_gpio_platform_data *pdata =
			dev_get_platdata(&client->dev);
	struct adp5588_gpio *dev = i2c_get_clientdata(client);
	int ret;

	if (pdata && pdata->teardown) {
		ret = pdata->teardown(client,
				      dev->gpio_chip.base, dev->gpio_chip.ngpio,
				      pdata->context);
		if (ret < 0) {
			dev_err(&client->dev, "teardown failed %d\n", ret);
			return ret;
		}
	}

	if (dev->client->irq)
		free_irq(dev->client->irq, dev);

	return 0;
}

static const struct i2c_device_id adp5588_gpio_id[] = {
	{DRV_NAME, 0},
	{}
};
MODULE_DEVICE_TABLE(i2c, adp5588_gpio_id);

#ifdef CONFIG_OF
static const struct of_device_id adp5588_gpio_of_id[] = {
	{ .compatible = "adi," DRV_NAME, },
	{},
};
MODULE_DEVICE_TABLE(of, adp5588_gpio_of_id);
#endif

static struct i2c_driver adp5588_gpio_driver = {
	.driver = {
		.name = DRV_NAME,
		.of_match_table = of_match_ptr(adp5588_gpio_of_id),
	},
	.probe_new = adp5588_gpio_probe,
	.remove = adp5588_gpio_remove,
	.id_table = adp5588_gpio_id,
};

module_i2c_driver(adp5588_gpio_driver);

MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
MODULE_DESCRIPTION("GPIO ADP5588 Driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
	1	/*
	2	* GPIO Chip driver for Analog Devices
	3	* ADP5588/ADP5587 I/O Expander and QWERTY Keypad Controller
	4	*
	5	* Copyright 2009-2010 Analog Devices Inc.
	6	*
	7	* Licensed under the GPL-2 or later.
	8	*/
	9
	10	#include <linux/module.h>
	11	#include <linux/kernel.h>
	12	#include <linux/slab.h>
	13	#include <linux/init.h>
	14	#include <linux/i2c.h>
	15	#include <linux/gpio/driver.h>
	16	#include <linux/interrupt.h>
	17	#include <linux/irq.h>
	18	#include <linux/of_device.h>
	19
	20	#include <linux/platform_data/adp5588.h>
	21
	22	#define DRV_NAME "adp5588-gpio"
	23
	24	/*
	25	* Early pre 4.0 Silicon required to delay readout by at least 25ms,
	26	* since the Event Counter Register updated 25ms after the interrupt
	27	* asserted.
	28	*/
	29	#define WA_DELAYED_READOUT_REVID(rev) ((rev) < 4)
	30
	31	struct adp5588_gpio {
	32	struct i2c_client *client;
	33	struct gpio_chip gpio_chip;
	34	struct mutex lock; /* protect cached dir, dat_out */
	35	/* protect serialized access to the interrupt controller bus */
	36	struct mutex irq_lock;
	37	uint8_t dat_out[3];
	38	uint8_t dir[3];
	39	uint8_t int_lvl[3];
	40	uint8_t int_en[3];
	41	uint8_t irq_mask[3];
	42	uint8_t irq_stat[3];
	43	uint8_t int_input_en[3];
	44	uint8_t int_lvl_cached[3];
	45	};
	46
	47	static int adp5588_gpio_read(struct i2c_client *client, u8 reg)
	48	{
	49	int ret = i2c_smbus_read_byte_data(client, reg);
	50
	51	if (ret < 0)
	52	dev_err(&client->dev, "Read Error\n");
	53
	54	return ret;
	55	}
	56
	57	static int adp5588_gpio_write(struct i2c_client *client, u8 reg, u8 val)
	58	{
	59	int ret = i2c_smbus_write_byte_data(client, reg, val);
	60
	61	if (ret < 0)
	62	dev_err(&client->dev, "Write Error\n");
	63
	64	return ret;
	65	}
	66
	67	static int adp5588_gpio_get_value(struct gpio_chip *chip, unsigned off)
	68	{
	69	struct adp5588_gpio *dev = gpiochip_get_data(chip);
	70	unsigned bank = ADP5588_BANK(off);
	71	unsigned bit = ADP5588_BIT(off);
	72	int val;
	73
	74	mutex_lock(&dev->lock);
	75
	76	if (dev->dir[bank] & bit)
	77	val = dev->dat_out[bank];
	78	else
	79	val = adp5588_gpio_read(dev->client, GPIO_DAT_STAT1 + bank);
	80
	81	mutex_unlock(&dev->lock);
	82
	83	return !!(val & bit);
	84	}
	85
	86	static void adp5588_gpio_set_value(struct gpio_chip *chip,
	87	unsigned off, int val)
	88	{
	89	unsigned bank, bit;
	90	struct adp5588_gpio *dev = gpiochip_get_data(chip);
	91
	92	bank = ADP5588_BANK(off);
	93	bit = ADP5588_BIT(off);
	94
	95	mutex_lock(&dev->lock);
	96	if (val)
	97	dev->dat_out[bank] \|= bit;
	98	else
	99	dev->dat_out[bank] &= ~bit;
	100
	101	adp5588_gpio_write(dev->client, GPIO_DAT_OUT1 + bank,
	102	dev->dat_out[bank]);
	103	mutex_unlock(&dev->lock);
	104	}
	105
	106	static int adp5588_gpio_direction_input(struct gpio_chip *chip, unsigned off)
	107	{
	108	int ret;
	109	unsigned bank;
	110	struct adp5588_gpio *dev = gpiochip_get_data(chip);
	111
	112	bank = ADP5588_BANK(off);
	113
	114	mutex_lock(&dev->lock);
	115	dev->dir[bank] &= ~ADP5588_BIT(off);
	116	ret = adp5588_gpio_write(dev->client, GPIO_DIR1 + bank, dev->dir[bank]);
	117	mutex_unlock(&dev->lock);
	118
	119	return ret;
	120	}
	121
	122	static int adp5588_gpio_direction_output(struct gpio_chip *chip,
	123	unsigned off, int val)
	124	{
	125	int ret;
	126	unsigned bank, bit;
	127	struct adp5588_gpio *dev = gpiochip_get_data(chip);
	128
	129	bank = ADP5588_BANK(off);
	130	bit = ADP5588_BIT(off);
	131
	132	mutex_lock(&dev->lock);
	133	dev->dir[bank] \|= bit;
	134
	135	if (val)
	136	dev->dat_out[bank] \|= bit;
	137	else
	138	dev->dat_out[bank] &= ~bit;
	139
	140	ret = adp5588_gpio_write(dev->client, GPIO_DAT_OUT1 + bank,
	141	dev->dat_out[bank]);
	142	ret \|= adp5588_gpio_write(dev->client, GPIO_DIR1 + bank,
	143	dev->dir[bank]);
	144	mutex_unlock(&dev->lock);
	145
	146	return ret;
	147	}
	148
	149	#ifdef CONFIG_GPIO_ADP5588_IRQ
	150
	151	static void adp5588_irq_bus_lock(struct irq_data *d)
	152	{
	153	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	154	struct adp5588_gpio *dev = gpiochip_get_data(gc);
	155
	156	mutex_lock(&dev->irq_lock);
	157	}
	158
	159	/*
	160	* genirq core code can issue chip->mask/unmask from atomic context.
	161	* This doesn't work for slow busses where an access needs to sleep.
	162	* bus_sync_unlock() is therefore called outside the atomic context,
	163	* syncs the current irq mask state with the slow external controller
	164	* and unlocks the bus.
	165	*/
	166
	167	static void adp5588_irq_bus_sync_unlock(struct irq_data *d)
	168	{
	169	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	170	struct adp5588_gpio *dev = gpiochip_get_data(gc);
	171	int i;
	172
	173	for (i = 0; i <= ADP5588_BANK(ADP5588_MAXGPIO); i++) {
	174	if (dev->int_input_en[i]) {
	175	mutex_lock(&dev->lock);
	176	dev->dir[i] &= ~dev->int_input_en[i];
	177	dev->int_input_en[i] = 0;
	178	adp5588_gpio_write(dev->client, GPIO_DIR1 + i,
	179	dev->dir[i]);
	180	mutex_unlock(&dev->lock);
	181	}
	182
	183	if (dev->int_lvl_cached[i] != dev->int_lvl[i]) {
	184	dev->int_lvl_cached[i] = dev->int_lvl[i];
	185	adp5588_gpio_write(dev->client, GPIO_INT_LVL1 + i,
	186	dev->int_lvl[i]);
	187	}
	188
	189	if (dev->int_en[i] ^ dev->irq_mask[i]) {
	190	dev->int_en[i] = dev->irq_mask[i];
	191	adp5588_gpio_write(dev->client, GPIO_INT_EN1 + i,
	192	dev->int_en[i]);
	193	}
	194	}
	195
	196	mutex_unlock(&dev->irq_lock);
	197	}
	198
	199	static void adp5588_irq_mask(struct irq_data *d)
	200	{
	201	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	202	struct adp5588_gpio *dev = gpiochip_get_data(gc);
	203
	204	dev->irq_mask[ADP5588_BANK(d->hwirq)] &= ~ADP5588_BIT(d->hwirq);
	205	}
	206
	207	static void adp5588_irq_unmask(struct irq_data *d)
	208	{
	209	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	210	struct adp5588_gpio *dev = gpiochip_get_data(gc);
	211
	212	dev->irq_mask[ADP5588_BANK(d->hwirq)] \|= ADP5588_BIT(d->hwirq);
	213	}
	214
	215	static int adp5588_irq_set_type(struct irq_data *d, unsigned int type)
	216	{
	217	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	218	struct adp5588_gpio *dev = gpiochip_get_data(gc);
	219	uint16_t gpio = d->hwirq;
	220	unsigned bank, bit;
	221
	222	if ((type & IRQ_TYPE_EDGE_BOTH)) {
	223	dev_err(&dev->client->dev, "irq %d: unsupported type %d\n",
	224	d->irq, type);
	225	return -EINVAL;
	226	}
	227
	228	bank = ADP5588_BANK(gpio);
	229	bit = ADP5588_BIT(gpio);
	230
	231	if (type & IRQ_TYPE_LEVEL_HIGH)
	232	dev->int_lvl[bank] \|= bit;
	233	else if (type & IRQ_TYPE_LEVEL_LOW)
	234	dev->int_lvl[bank] &= ~bit;
	235	else
	236	return -EINVAL;
	237
	238	dev->int_input_en[bank] \|= bit;
	239
	240	return 0;
	241	}
	242
	243	static struct irq_chip adp5588_irq_chip = {
	244	.name = "adp5588",
	245	.irq_mask = adp5588_irq_mask,
	246	.irq_unmask = adp5588_irq_unmask,
	247	.irq_bus_lock = adp5588_irq_bus_lock,
	248	.irq_bus_sync_unlock = adp5588_irq_bus_sync_unlock,
	249	.irq_set_type = adp5588_irq_set_type,
	250	};
	251
	252	static int adp5588_gpio_read_intstat(struct i2c_client client, u8 buf)
	253	{
	254	int ret = i2c_smbus_read_i2c_block_data(client, GPIO_INT_STAT1, 3, buf);
	255
	256	if (ret < 0)
	257	dev_err(&client->dev, "Read INT_STAT Error\n");
	258
	259	return ret;
	260	}
	261
	262	static irqreturn_t adp5588_irq_handler(int irq, void *devid)
	263	{
	264	struct adp5588_gpio *dev = devid;
	265	unsigned status, bank, bit, pending;
	266	int ret;
	267	status = adp5588_gpio_read(dev->client, INT_STAT);
	268
	269	if (status & ADP5588_GPI_INT) {
	270	ret = adp5588_gpio_read_intstat(dev->client, dev->irq_stat);
	271	if (ret < 0)
	272	memset(dev->irq_stat, 0, ARRAY_SIZE(dev->irq_stat));
	273
	274	for (bank = 0, bit = 0; bank <= ADP5588_BANK(ADP5588_MAXGPIO);
	275	bank++, bit = 0) {
	276	pending = dev->irq_stat[bank] & dev->irq_mask[bank];
	277
	278	while (pending) {
	279	if (pending & (1 << bit)) {
	280	handle_nested_irq(
	281	irq_find_mapping(
	282	dev->gpio_chip.irq.domain,
	283	(bank << 3) + bit));
	284	pending &= ~(1 << bit);
	285	}
	286	bit++;
	287	}
	288	}
	289	}
	290
	291	adp5588_gpio_write(dev->client, INT_STAT, status); /* Status is W1C */
	292
	293	return IRQ_HANDLED;
	294	}
	295
	296	static int adp5588_irq_setup(struct adp5588_gpio *dev)
	297	{
	298	struct i2c_client *client = dev->client;
	299	int ret;
	300	struct adp5588_gpio_platform_data *pdata =
	301	dev_get_platdata(&client->dev);
	302	int irq_base = pdata ? pdata->irq_base : 0;
	303
	304	adp5588_gpio_write(client, CFG, ADP5588_AUTO_INC);
	305	adp5588_gpio_write(client, INT_STAT, -1); /* status is W1C */
	306	adp5588_gpio_read_intstat(client, dev->irq_stat); /* read to clear */
	307
	308	mutex_init(&dev->irq_lock);
	309
	310	ret = devm_request_threaded_irq(&client->dev, client->irq,
	311	NULL, adp5588_irq_handler, IRQF_ONESHOT
	312	\| IRQF_TRIGGER_FALLING \| IRQF_SHARED,
	313	dev_name(&client->dev), dev);
	314	if (ret) {
	315	dev_err(&client->dev, "failed to request irq %d\n",
	316	client->irq);
	317	return ret;
	318	}
	319	ret = gpiochip_irqchip_add_nested(&dev->gpio_chip,
	320	&adp5588_irq_chip, irq_base,
	321	handle_simple_irq,
	322	IRQ_TYPE_NONE);
	323	if (ret) {
	324	dev_err(&client->dev,
	325	"could not connect irqchip to gpiochip\n");
	326	return ret;
	327	}
	328	gpiochip_set_nested_irqchip(&dev->gpio_chip,
	329	&adp5588_irq_chip,
	330	client->irq);
	331
	332	adp5588_gpio_write(client, CFG,
	333	ADP5588_AUTO_INC \| ADP5588_INT_CFG \| ADP5588_GPI_INT);
	334
	335	return 0;
	336	}
	337
	338	#else
	339	static int adp5588_irq_setup(struct adp5588_gpio *dev)
	340	{
	341	struct i2c_client *client = dev->client;
	342	dev_warn(&client->dev, "interrupt support not compiled in\n");
	343
	344	return 0;
	345	}
	346
	347	#endif /* CONFIG_GPIO_ADP5588_IRQ */
	348
	349	static int adp5588_gpio_probe(struct i2c_client *client)
	350	{
	351	struct adp5588_gpio_platform_data *pdata =
	352	dev_get_platdata(&client->dev);
	353	struct adp5588_gpio *dev;
	354	struct gpio_chip *gc;
	355	int ret, i, revid;
	356	unsigned int pullup_dis_mask = 0;
	357
	358	if (!i2c_check_functionality(client->adapter,
	359	I2C_FUNC_SMBUS_BYTE_DATA)) {
	360	dev_err(&client->dev, "SMBUS Byte Data not Supported\n");
	361	return -EIO;
	362	}
	363
	364	dev = devm_kzalloc(&client->dev, sizeof(*dev), GFP_KERNEL);
	365	if (!dev)
	366	return -ENOMEM;
	367
	368	dev->client = client;
	369
	370	gc = &dev->gpio_chip;
	371	gc->direction_input = adp5588_gpio_direction_input;
	372	gc->direction_output = adp5588_gpio_direction_output;
	373	gc->get = adp5588_gpio_get_value;
	374	gc->set = adp5588_gpio_set_value;
	375	gc->can_sleep = true;
	376	gc->base = -1;
	377	gc->parent = &client->dev;
	378
	379	if (pdata) {
	380	gc->base = pdata->gpio_start;
	381	gc->names = pdata->names;
	382	pullup_dis_mask = pdata->pullup_dis_mask;
	383	}
	384
	385	gc->ngpio = ADP5588_MAXGPIO;
	386	gc->label = client->name;
	387	gc->owner = THIS_MODULE;
	388
	389	mutex_init(&dev->lock);
	390
	391	ret = adp5588_gpio_read(dev->client, DEV_ID);
	392	if (ret < 0)
	393	return ret;
	394
	395	revid = ret & ADP5588_DEVICE_ID_MASK;
	396
	397	for (i = 0, ret = 0; i <= ADP5588_BANK(ADP5588_MAXGPIO); i++) {
	398	dev->dat_out[i] = adp5588_gpio_read(client, GPIO_DAT_OUT1 + i);
	399	dev->dir[i] = adp5588_gpio_read(client, GPIO_DIR1 + i);
	400	ret \|= adp5588_gpio_write(client, KP_GPIO1 + i, 0);
	401	ret \|= adp5588_gpio_write(client, GPIO_PULL1 + i,
	402	(pullup_dis_mask >> (8 * i)) & 0xFF);
	403	ret \|= adp5588_gpio_write(client, GPIO_INT_EN1 + i, 0);
	404	if (ret)
	405	return ret;
	406	}
	407
	408	if (client->irq) {
	409	if (WA_DELAYED_READOUT_REVID(revid)) {
	410	dev_warn(&client->dev, "GPIO int not supported\n");
	411	} else {
	412	ret = adp5588_irq_setup(dev);
	413	if (ret)
	414	return ret;
	415	}
	416	}
	417
	418	ret = devm_gpiochip_add_data(&client->dev, &dev->gpio_chip, dev);
	419	if (ret)
	420	return ret;
	421
	422	if (pdata && pdata->setup) {
	423	ret = pdata->setup(client, gc->base, gc->ngpio, pdata->context);
	424	if (ret < 0)
	425	dev_warn(&client->dev, "setup failed, %d\n", ret);
	426	}
	427
	428	i2c_set_clientdata(client, dev);
	429
	430	return 0;
	431	}
	432
	433	static int adp5588_gpio_remove(struct i2c_client *client)
	434	{
	435	struct adp5588_gpio_platform_data *pdata =
	436	dev_get_platdata(&client->dev);
	437	struct adp5588_gpio *dev = i2c_get_clientdata(client);
	438	int ret;
	439
	440	if (pdata && pdata->teardown) {
	441	ret = pdata->teardown(client,
	442	dev->gpio_chip.base, dev->gpio_chip.ngpio,
	443	pdata->context);
	444	if (ret < 0) {
	445	dev_err(&client->dev, "teardown failed %d\n", ret);
	446	return ret;
	447	}
	448	}
	449
	450	if (dev->client->irq)
	451	free_irq(dev->client->irq, dev);
	452
	453	return 0;
	454	}
	455
	456	static const struct i2c_device_id adp5588_gpio_id[] = {
	457	{DRV_NAME, 0},
	458	{}
	459	};
	460	MODULE_DEVICE_TABLE(i2c, adp5588_gpio_id);
	461
	462	#ifdef CONFIG_OF
	463	static const struct of_device_id adp5588_gpio_of_id[] = {
	464	{ .compatible = "adi," DRV_NAME, },
	465	{},
	466	};
	467	MODULE_DEVICE_TABLE(of, adp5588_gpio_of_id);
	468	#endif
	469
	470	static struct i2c_driver adp5588_gpio_driver = {
	471	.driver = {
	472	.name = DRV_NAME,
	473	.of_match_table = of_match_ptr(adp5588_gpio_of_id),
	474	},
	475	.probe_new = adp5588_gpio_probe,
	476	.remove = adp5588_gpio_remove,
	477	.id_table = adp5588_gpio_id,
	478	};
	479
	480	module_i2c_driver(adp5588_gpio_driver);
	481
	482	MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
	483	MODULE_DESCRIPTION("GPIO ADP5588 Driver");
	484	MODULE_LICENSE("GPL");