[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / gpio / adp5588-gpio.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.h>
#include <linux/interrupt.h>
#include <linux/irq.h>

#include <linux/i2c/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;
	unsigned gpio_start;
	unsigned irq_base;
	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];
};

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 =
	    container_of(chip, struct adp5588_gpio, gpio_chip);

	return !!(adp5588_gpio_read(dev->client,
		  GPIO_DAT_STAT1 + ADP5588_BANK(off)) & ADP5588_BIT(off));
}

static void adp5588_gpio_set_value(struct gpio_chip *chip,
				   unsigned off, int val)
{
	unsigned bank, bit;
	struct adp5588_gpio *dev =
	    container_of(chip, struct adp5588_gpio, gpio_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 =
	    container_of(chip, struct adp5588_gpio, gpio_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 =
	    container_of(chip, struct adp5588_gpio, gpio_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 int adp5588_gpio_to_irq(struct gpio_chip *chip, unsigned off)
{
	struct adp5588_gpio *dev =
		container_of(chip, struct adp5588_gpio, gpio_chip);
	return dev->irq_base + off;
}

static void adp5588_irq_bus_lock(unsigned int irq)
{
	struct adp5588_gpio *dev = get_irq_chip_data(irq);
	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(unsigned int irq)
{
	struct adp5588_gpio *dev = get_irq_chip_data(irq);
	int i;

	for (i = 0; i <= ADP5588_BANK(ADP5588_MAXGPIO); 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(unsigned int irq)
{
	struct adp5588_gpio *dev = get_irq_chip_data(irq);
	unsigned gpio = irq - dev->irq_base;

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

static void adp5588_irq_unmask(unsigned int irq)
{
	struct adp5588_gpio *dev = get_irq_chip_data(irq);
	unsigned gpio = irq - dev->irq_base;

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

static int adp5588_irq_set_type(unsigned int irq, unsigned int type)
{
	struct adp5588_gpio *dev = get_irq_chip_data(irq);
	uint16_t gpio = irq - dev->irq_base;
	unsigned bank, bit;

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

	adp5588_gpio_direction_input(&dev->gpio_chip, gpio);
	adp5588_gpio_write(dev->client, GPIO_INT_LVL1 + bank,
			   dev->int_lvl[bank]);

	return 0;
}

static struct irq_chip adp5588_irq_chip = {
	.name			= "adp5588",
	.mask			= adp5588_irq_mask,
	.unmask			= adp5588_irq_unmask,
	.bus_lock		= adp5588_irq_bus_lock,
	.bus_sync_unlock	= adp5588_irq_bus_sync_unlock,
	.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; 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(dev->irq_base +
							  (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;
	struct adp5588_gpio_platform_data *pdata = client->dev.platform_data;
	unsigned gpio;
	int ret;

	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 */

	dev->irq_base = pdata->irq_base;
	mutex_init(&dev->irq_lock);

	for (gpio = 0; gpio < dev->gpio_chip.ngpio; gpio++) {
		int irq = gpio + dev->irq_base;
		set_irq_chip_data(irq, dev);
		set_irq_chip_and_handler(irq, &adp5588_irq_chip,
					 handle_level_irq);
		set_irq_nested_thread(irq, 1);
#ifdef CONFIG_ARM
		/*
		 * ARM needs us to explicitly flag the IRQ as VALID,
		 * once we do so, it will also set the noprobe.
		 */
		set_irq_flags(irq, IRQF_VALID);
#else
		set_irq_noprobe(irq);
#endif
	}

	ret = request_threaded_irq(client->irq,
				   NULL,
				   adp5588_irq_handler,
				   IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
				   dev_name(&client->dev), dev);
	if (ret) {
		dev_err(&client->dev, "failed to request irq %d\n",
			client->irq);
		goto out;
	}

	dev->gpio_chip.to_irq = adp5588_gpio_to_irq;
	adp5588_gpio_write(client, CFG,
		ADP5588_AUTO_INC | ADP5588_INT_CFG | ADP5588_GPI_INT);

	return 0;

out:
	dev->irq_base = 0;
	return ret;
}

static void adp5588_irq_teardown(struct adp5588_gpio *dev)
{
	if (dev->irq_base)
		free_irq(dev->client->irq, dev);
}

#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;
}

static void adp5588_irq_teardown(struct adp5588_gpio *dev)
{
}
#endif /* CONFIG_GPIO_ADP5588_IRQ */

static int __devinit adp5588_gpio_probe(struct i2c_client *client,
					const struct i2c_device_id *id)
{
	struct adp5588_gpio_platform_data *pdata = client->dev.platform_data;
	struct adp5588_gpio *dev;
	struct gpio_chip *gc;
	int ret, i, revid;

	if (pdata == NULL) {
		dev_err(&client->dev, "missing platform data\n");
		return -ENODEV;
	}

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

	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
	if (dev == NULL) {
		dev_err(&client->dev, "failed to alloc memory\n");
		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 = 1;

	gc->base = pdata->gpio_start;
	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)
		goto err;

	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,
				(pdata->pullup_dis_mask >> (8 * i)) & 0xFF);
		ret |= adp5588_gpio_write(client, GPIO_INT_EN1 + i, 0);
		if (ret)
			goto err;
	}

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

	ret = gpiochip_add(&dev->gpio_chip);
	if (ret)
		goto err_irq;

	dev_info(&client->dev, "gpios %d..%d (IRQ Base %d) on a %s Rev. %d\n",
			gc->base, gc->base + gc->ngpio - 1,
			pdata->irq_base, client->name, revid);

	if (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;

err_irq:
	adp5588_irq_teardown(dev);
err:
	kfree(dev);
	return ret;
}

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

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

	ret = gpiochip_remove(&dev->gpio_chip);
	if (ret) {
		dev_err(&client->dev, "gpiochip_remove failed %d\n", ret);
		return ret;
	}

	kfree(dev);
	return 0;
}

static const struct i2c_device_id adp5588_gpio_id[] = {
	{DRV_NAME, 0},
	{}
};

MODULE_DEVICE_TABLE(i2c, adp5588_gpio_id);

static struct i2c_driver adp5588_gpio_driver = {
	.driver = {
		   .name = DRV_NAME,
		   },
	.probe = adp5588_gpio_probe,
	.remove = __devexit_p(adp5588_gpio_remove),
	.id_table = adp5588_gpio_id,
};

static int __init adp5588_gpio_init(void)
{
	return i2c_add_driver(&adp5588_gpio_driver);
}

module_init(adp5588_gpio_init);

static void __exit adp5588_gpio_exit(void)
{
	i2c_del_driver(&adp5588_gpio_driver);
}

module_exit(adp5588_gpio_exit);

MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
MODULE_DESCRIPTION("GPIO ADP5588 Driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
80884094 MH	1	/*
80884094 MH	2	* GPIO Chip driver for Analog Devices
459773ae	3	* ADP5588/ADP5587 I/O Expander and QWERTY Keypad Controller
80884094	4	*
459773ae	5	* Copyright 2009-2010 Analog Devices Inc.
80884094 MH	6	*
	7	* Licensed under the GPL-2 or later.
	8	*/
	9
	10	#include <linux/module.h>
	11	#include <linux/kernel.h>
5a0e3ad6	12	#include <linux/slab.h>
80884094 MH	13	#include <linux/init.h>
	14	#include <linux/i2c.h>
	15	#include <linux/gpio.h>
459773ae MH	16	#include <linux/interrupt.h>
459773ae MH	17	#include <linux/irq.h>
80884094 MH	18
	19	#include <linux/i2c/adp5588.h>
	20
459773ae MH	21	#define DRV_NAME "adp5588-gpio"
	22
	23	/*
	24	* Early pre 4.0 Silicon required to delay readout by at least 25ms,
	25	* since the Event Counter Register updated 25ms after the interrupt
	26	* asserted.
	27	*/
	28	#define WA_DELAYED_READOUT_REVID(rev) ((rev) < 4)
80884094 MH	29
	30	struct adp5588_gpio {
	31	struct i2c_client *client;
	32	struct gpio_chip gpio_chip;
	33	struct mutex lock; /* protect cached dir, dat_out */
459773ae MH	34	/* protect serialized access to the interrupt controller bus */
459773ae MH	35	struct mutex irq_lock;
80884094	36	unsigned gpio_start;
459773ae	37	unsigned irq_base;
80884094 MH	38	uint8_t dat_out[3];
80884094 MH	39	uint8_t dir[3];
459773ae MH	40	uint8_t int_lvl[3];
	41	uint8_t int_en[3];
	42	uint8_t irq_mask[3];
	43	uint8_t irq_stat[3];
80884094 MH	44	};
	45
	46	static int adp5588_gpio_read(struct i2c_client *client, u8 reg)
	47	{
	48	int ret = i2c_smbus_read_byte_data(client, reg);
	49
	50	if (ret < 0)
	51	dev_err(&client->dev, "Read Error\n");
	52
	53	return ret;
	54	}
	55
	56	static int adp5588_gpio_write(struct i2c_client *client, u8 reg, u8 val)
	57	{
	58	int ret = i2c_smbus_write_byte_data(client, reg, val);
	59
	60	if (ret < 0)
	61	dev_err(&client->dev, "Write Error\n");
	62
	63	return ret;
	64	}
	65
	66	static int adp5588_gpio_get_value(struct gpio_chip *chip, unsigned off)
	67	{
	68	struct adp5588_gpio *dev =
	69	container_of(chip, struct adp5588_gpio, gpio_chip);
	70
459773ae MH	71	return !!(adp5588_gpio_read(dev->client,
459773ae MH	72	GPIO_DAT_STAT1 + ADP5588_BANK(off)) & ADP5588_BIT(off));
80884094 MH	73	}
	74
	75	static void adp5588_gpio_set_value(struct gpio_chip *chip,
	76	unsigned off, int val)
	77	{
	78	unsigned bank, bit;
	79	struct adp5588_gpio *dev =
	80	container_of(chip, struct adp5588_gpio, gpio_chip);
	81
459773ae MH	82	bank = ADP5588_BANK(off);
459773ae MH	83	bit = ADP5588_BIT(off);
80884094 MH	84
	85	mutex_lock(&dev->lock);
	86	if (val)
	87	dev->dat_out[bank] \|= bit;
	88	else
	89	dev->dat_out[bank] &= ~bit;
	90
	91	adp5588_gpio_write(dev->client, GPIO_DAT_OUT1 + bank,
	92	dev->dat_out[bank]);
	93	mutex_unlock(&dev->lock);
	94	}
	95
	96	static int adp5588_gpio_direction_input(struct gpio_chip *chip, unsigned off)
	97	{
	98	int ret;
	99	unsigned bank;
	100	struct adp5588_gpio *dev =
	101	container_of(chip, struct adp5588_gpio, gpio_chip);
	102
459773ae	103	bank = ADP5588_BANK(off);
80884094 MH	104
80884094 MH	105	mutex_lock(&dev->lock);
459773ae	106	dev->dir[bank] &= ~ADP5588_BIT(off);
80884094 MH	107	ret = adp5588_gpio_write(dev->client, GPIO_DIR1 + bank, dev->dir[bank]);
	108	mutex_unlock(&dev->lock);
	109
	110	return ret;
	111	}
	112
	113	static int adp5588_gpio_direction_output(struct gpio_chip *chip,
	114	unsigned off, int val)
	115	{
	116	int ret;
	117	unsigned bank, bit;
	118	struct adp5588_gpio *dev =
	119	container_of(chip, struct adp5588_gpio, gpio_chip);
	120
459773ae MH	121	bank = ADP5588_BANK(off);
459773ae MH	122	bit = ADP5588_BIT(off);
80884094 MH	123
	124	mutex_lock(&dev->lock);
	125	dev->dir[bank] \|= bit;
	126
	127	if (val)
	128	dev->dat_out[bank] \|= bit;
	129	else
	130	dev->dat_out[bank] &= ~bit;
	131
	132	ret = adp5588_gpio_write(dev->client, GPIO_DAT_OUT1 + bank,
	133	dev->dat_out[bank]);
	134	ret \|= adp5588_gpio_write(dev->client, GPIO_DIR1 + bank,
	135	dev->dir[bank]);
	136	mutex_unlock(&dev->lock);
	137
	138	return ret;
	139	}
	140
459773ae MH	141	#ifdef CONFIG_GPIO_ADP5588_IRQ
	142	static int adp5588_gpio_to_irq(struct gpio_chip *chip, unsigned off)
	143	{
	144	struct adp5588_gpio *dev =
	145	container_of(chip, struct adp5588_gpio, gpio_chip);
	146	return dev->irq_base + off;
	147	}
	148
	149	static void adp5588_irq_bus_lock(unsigned int irq)
	150	{
	151	struct adp5588_gpio *dev = get_irq_chip_data(irq);
	152	mutex_lock(&dev->irq_lock);
	153	}
	154
	155	/*
	156	* genirq core code can issue chip->mask/unmask from atomic context.
	157	* This doesn't work for slow busses where an access needs to sleep.
	158	* bus_sync_unlock() is therefore called outside the atomic context,
	159	* syncs the current irq mask state with the slow external controller
	160	* and unlocks the bus.
	161	*/
	162
	163	static void adp5588_irq_bus_sync_unlock(unsigned int irq)
	164	{
	165	struct adp5588_gpio *dev = get_irq_chip_data(irq);
	166	int i;
	167
	168	for (i = 0; i <= ADP5588_BANK(ADP5588_MAXGPIO); i++)
	169	if (dev->int_en[i] ^ dev->irq_mask[i]) {
	170	dev->int_en[i] = dev->irq_mask[i];
	171	adp5588_gpio_write(dev->client, GPIO_INT_EN1 + i,
	172	dev->int_en[i]);
	173	}
	174
	175	mutex_unlock(&dev->irq_lock);
	176	}
	177
	178	static void adp5588_irq_mask(unsigned int irq)
	179	{
	180	struct adp5588_gpio *dev = get_irq_chip_data(irq);
	181	unsigned gpio = irq - dev->irq_base;
	182
	183	dev->irq_mask[ADP5588_BANK(gpio)] &= ~ADP5588_BIT(gpio);
	184	}
	185
	186	static void adp5588_irq_unmask(unsigned int irq)
	187	{
	188	struct adp5588_gpio *dev = get_irq_chip_data(irq);
	189	unsigned gpio = irq - dev->irq_base;
	190
	191	dev->irq_mask[ADP5588_BANK(gpio)] \|= ADP5588_BIT(gpio);
	192	}
	193
	194	static int adp5588_irq_set_type(unsigned int irq, unsigned int type)
	195	{
	196	struct adp5588_gpio *dev = get_irq_chip_data(irq);
	197	uint16_t gpio = irq - dev->irq_base;
	198	unsigned bank, bit;
	199
	200	if ((type & IRQ_TYPE_EDGE_BOTH)) {
	201	dev_err(&dev->client->dev, "irq %d: unsupported type %d\n",
	202	irq, type);
	203	return -EINVAL;
	204	}
205
206	bank = ADP5588_BANK(gpio);
207	bit = ADP5588_BIT(gpio);
208
209	if (type & IRQ_TYPE_LEVEL_HIGH)
210	dev->int_lvl[bank] \|= bit;
211	else if (type & IRQ_TYPE_LEVEL_LOW)
212	dev->int_lvl[bank] &= ~bit;
213	else
214	return -EINVAL;
215
216	adp5588_gpio_direction_input(&dev->gpio_chip, gpio);
217	adp5588_gpio_write(dev->client, GPIO_INT_LVL1 + bank,
218	dev->int_lvl[bank]);
219
220	return 0;
221	}
222
223	static struct irq_chip adp5588_irq_chip = {
224	.name = "adp5588",
225	.mask = adp5588_irq_mask,
226	.unmask = adp5588_irq_unmask,
227	.bus_lock = adp5588_irq_bus_lock,
228	.bus_sync_unlock = adp5588_irq_bus_sync_unlock,
229	.set_type = adp5588_irq_set_type,
230	};
231
232	static int adp5588_gpio_read_intstat(struct i2c_client client, u8 buf)
233	{
234	int ret = i2c_smbus_read_i2c_block_data(client, GPIO_INT_STAT1, 3, buf);
235
236	if (ret < 0)
237	dev_err(&client->dev, "Read INT_STAT Error\n");
238
239	return ret;
240	}
241
242	static irqreturn_t adp5588_irq_handler(int irq, void *devid)
243	{
244	struct adp5588_gpio *dev = devid;
245	unsigned status, bank, bit, pending;
246	int ret;
247	status = adp5588_gpio_read(dev->client, INT_STAT);
248
249	if (status & ADP5588_GPI_INT) {
250	ret = adp5588_gpio_read_intstat(dev->client, dev->irq_stat);
251	if (ret < 0)
252	memset(dev->irq_stat, 0, ARRAY_SIZE(dev->irq_stat));
253
254	for (bank = 0; bank <= ADP5588_BANK(ADP5588_MAXGPIO);
255	bank++, bit = 0) {
256	pending = dev->irq_stat[bank] & dev->irq_mask[bank];
257
258	while (pending) {
259	if (pending & (1 << bit)) {
260	handle_nested_irq(dev->irq_base +
261	(bank << 3) + bit);
262	pending &= ~(1 << bit);
263
264	}
265	bit++;
266	}
267	}
268	}
269
270	adp5588_gpio_write(dev->client, INT_STAT, status); /* Status is W1C */
271
272	return IRQ_HANDLED;
273	}
274
275	static int adp5588_irq_setup(struct adp5588_gpio *dev)
276	{
277	struct i2c_client *client = dev->client;
278	struct adp5588_gpio_platform_data *pdata = client->dev.platform_data;
279	unsigned gpio;
280	int ret;
281
282	adp5588_gpio_write(client, CFG, ADP5588_AUTO_INC);
283	adp5588_gpio_write(client, INT_STAT, -1); /* status is W1C */
284	adp5588_gpio_read_intstat(client, dev->irq_stat); /* read to clear */
285
286	dev->irq_base = pdata->irq_base;
287	mutex_init(&dev->irq_lock);
288
289	for (gpio = 0; gpio < dev->gpio_chip.ngpio; gpio++) {
290	int irq = gpio + dev->irq_base;
291	set_irq_chip_data(irq, dev);
292	set_irq_chip_and_handler(irq, &adp5588_irq_chip,
293	handle_level_irq);
294	set_irq_nested_thread(irq, 1);
295	#ifdef CONFIG_ARM
296	/*
297	* ARM needs us to explicitly flag the IRQ as VALID,
298	* once we do so, it will also set the noprobe.
299	*/
300	set_irq_flags(irq, IRQF_VALID);
301	#else
302	set_irq_noprobe(irq);
303	#endif
304	}
305
306	ret = request_threaded_irq(client->irq,
307	NULL,
308	adp5588_irq_handler,
309	IRQF_TRIGGER_FALLING \| IRQF_ONESHOT,
310	dev_name(&client->dev), dev);
311	if (ret) {
312	dev_err(&client->dev, "failed to request irq %d\n",
313	client->irq);
314	goto out;
315	}
316
317	dev->gpio_chip.to_irq = adp5588_gpio_to_irq;
318	adp5588_gpio_write(client, CFG,
319	ADP5588_AUTO_INC \| ADP5588_INT_CFG \| ADP5588_GPI_INT);
320
321	return 0;
322
323	out:
324	dev->irq_base = 0;
325	return ret;
326	}
327
328	static void adp5588_irq_teardown(struct adp5588_gpio *dev)
329	{
330	if (dev->irq_base)
331	free_irq(dev->client->irq, dev);
332	}
333
334	#else
335	static int adp5588_irq_setup(struct adp5588_gpio *dev)
336	{
337	struct i2c_client *client = dev->client;
338	dev_warn(&client->dev, "interrupt support not compiled in\n");
339
340	return 0;
341	}
342
343	static void adp5588_irq_teardown(struct adp5588_gpio *dev)
344	{
345	}
346	#endif /* CONFIG_GPIO_ADP5588_IRQ */
347
80884094 MH	348	static int __devinit adp5588_gpio_probe(struct i2c_client *client,
	349	const struct i2c_device_id *id)
	350	{
	351	struct adp5588_gpio_platform_data *pdata = client->dev.platform_data;
	352	struct adp5588_gpio *dev;
	353	struct gpio_chip *gc;
	354	int ret, i, revid;
	355
	356	if (pdata == NULL) {
	357	dev_err(&client->dev, "missing platform data\n");
	358	return -ENODEV;
	359	}
	360
	361	if (!i2c_check_functionality(client->adapter,
	362	I2C_FUNC_SMBUS_BYTE_DATA)) {
	363	dev_err(&client->dev, "SMBUS Byte Data not Supported\n");
	364	return -EIO;
	365	}
	366
	367	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
	368	if (dev == NULL) {
	369	dev_err(&client->dev, "failed to alloc memory\n");
	370	return -ENOMEM;
	371	}
	372
	373	dev->client = client;
	374
	375	gc = &dev->gpio_chip;
	376	gc->direction_input = adp5588_gpio_direction_input;
	377	gc->direction_output = adp5588_gpio_direction_output;
	378	gc->get = adp5588_gpio_get_value;
	379	gc->set = adp5588_gpio_set_value;
	380	gc->can_sleep = 1;
	381
	382	gc->base = pdata->gpio_start;
459773ae	383	gc->ngpio = ADP5588_MAXGPIO;
80884094 MH	384	gc->label = client->name;
	385	gc->owner = THIS_MODULE;
	386
	387	mutex_init(&dev->lock);
	388
80884094 MH	389	ret = adp5588_gpio_read(dev->client, DEV_ID);
	390	if (ret < 0)
	391	goto err;
	392
	393	revid = ret & ADP5588_DEVICE_ID_MASK;
	394
459773ae	395	for (i = 0, ret = 0; i <= ADP5588_BANK(ADP5588_MAXGPIO); i++) {
80884094 MH	396	dev->dat_out[i] = adp5588_gpio_read(client, GPIO_DAT_OUT1 + i);
	397	dev->dir[i] = adp5588_gpio_read(client, GPIO_DIR1 + i);
	398	ret \|= adp5588_gpio_write(client, KP_GPIO1 + i, 0);
	399	ret \|= adp5588_gpio_write(client, GPIO_PULL1 + i,
	400	(pdata->pullup_dis_mask >> (8 * i)) & 0xFF);
459773ae	401	ret \|= adp5588_gpio_write(client, GPIO_INT_EN1 + i, 0);
80884094 MH	402	if (ret)
	403	goto err;
	404	}
	405
459773ae MH	406	if (pdata->irq_base) {
	407	if (WA_DELAYED_READOUT_REVID(revid)) {
	408	dev_warn(&client->dev, "GPIO int not supported\n");
	409	} else {
	410	ret = adp5588_irq_setup(dev);
	411	if (ret)
	412	goto err;
	413	}
	414	}
	415
80884094 MH	416	ret = gpiochip_add(&dev->gpio_chip);
80884094 MH	417	if (ret)
459773ae	418	goto err_irq;
80884094	419
459773ae	420	dev_info(&client->dev, "gpios %d..%d (IRQ Base %d) on a %s Rev. %d\n",
80884094	421	gc->base, gc->base + gc->ngpio - 1,
459773ae	422	pdata->irq_base, client->name, revid);
80884094 MH	423
	424	if (pdata->setup) {
	425	ret = pdata->setup(client, gc->base, gc->ngpio, pdata->context);
	426	if (ret < 0)
	427	dev_warn(&client->dev, "setup failed, %d\n", ret);
	428	}
	429
	430	i2c_set_clientdata(client, dev);
459773ae	431
80884094 MH	432	return 0;
80884094 MH	433
459773ae MH	434	err_irq:
459773ae MH	435	adp5588_irq_teardown(dev);
80884094 MH	436	err:
	437	kfree(dev);
	438	return ret;
	439	}
	440
	441	static int __devexit adp5588_gpio_remove(struct i2c_client *client)
	442	{
	443	struct adp5588_gpio_platform_data *pdata = client->dev.platform_data;
	444	struct adp5588_gpio *dev = i2c_get_clientdata(client);
	445	int ret;
	446
	447	if (pdata->teardown) {
	448	ret = pdata->teardown(client,
	449	dev->gpio_chip.base, dev->gpio_chip.ngpio,
	450	pdata->context);
	451	if (ret < 0) {
	452	dev_err(&client->dev, "teardown failed %d\n", ret);
	453	return ret;
	454	}
	455	}
	456
459773ae MH	457	if (dev->irq_base)
	458	free_irq(dev->client->irq, dev);
	459
80884094 MH	460	ret = gpiochip_remove(&dev->gpio_chip);
	461	if (ret) {
	462	dev_err(&client->dev, "gpiochip_remove failed %d\n", ret);
	463	return ret;
	464	}
	465
	466	kfree(dev);
	467	return 0;
	468	}
	469
	470	static const struct i2c_device_id adp5588_gpio_id[] = {
	471	{DRV_NAME, 0},
	472	{}
	473	};
	474
	475	MODULE_DEVICE_TABLE(i2c, adp5588_gpio_id);
	476
	477	static struct i2c_driver adp5588_gpio_driver = {
	478	.driver = {
	479	.name = DRV_NAME,
	480	},
	481	.probe = adp5588_gpio_probe,
	482	.remove = __devexit_p(adp5588_gpio_remove),
	483	.id_table = adp5588_gpio_id,
	484	};
	485
	486	static int __init adp5588_gpio_init(void)
	487	{
	488	return i2c_add_driver(&adp5588_gpio_driver);
	489	}
	490
	491	module_init(adp5588_gpio_init);
	492
	493	static void __exit adp5588_gpio_exit(void)
	494	{
	495	i2c_del_driver(&adp5588_gpio_driver);
	496	}
	497
	498	module_exit(adp5588_gpio_exit);
	499
	500	MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
	501	MODULE_DESCRIPTION("GPIO ADP5588 Driver");
	502	MODULE_LICENSE("GPL");