[deliverable/linux.git] / drivers / mfd / tc3589x.c

/*
 * Copyright (C) ST-Ericsson SA 2010
 *
 * License Terms: GNU General Public License, version 2
 * Author: Hanumath Prasad <hanumath.prasad@stericsson.com> for ST-Ericsson
 * Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
 */

#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/mfd/core.h>
#include <linux/mfd/tc3589x.h>
#include <linux/err.h>

/**
 * enum tc3589x_version - indicates the TC3589x version
 */
enum tc3589x_version {
	TC3589X_TC35890,
	TC3589X_TC35892,
	TC3589X_TC35893,
	TC3589X_TC35894,
	TC3589X_TC35895,
	TC3589X_TC35896,
	TC3589X_UNKNOWN,
};

#define TC3589x_CLKMODE_MODCTL_SLEEP		0x0
#define TC3589x_CLKMODE_MODCTL_OPERATION	(1 << 0)

/**
 * tc3589x_reg_read() - read a single TC3589x register
 * @tc3589x:	Device to read from
 * @reg:	Register to read
 */
int tc3589x_reg_read(struct tc3589x *tc3589x, u8 reg)
{
	int ret;

	ret = i2c_smbus_read_byte_data(tc3589x->i2c, reg);
	if (ret < 0)
		dev_err(tc3589x->dev, "failed to read reg %#x: %d\n",
			reg, ret);

	return ret;
}
EXPORT_SYMBOL_GPL(tc3589x_reg_read);

/**
 * tc3589x_reg_read() - write a single TC3589x register
 * @tc3589x:	Device to write to
 * @reg:	Register to read
 * @data:	Value to write
 */
int tc3589x_reg_write(struct tc3589x *tc3589x, u8 reg, u8 data)
{
	int ret;

	ret = i2c_smbus_write_byte_data(tc3589x->i2c, reg, data);
	if (ret < 0)
		dev_err(tc3589x->dev, "failed to write reg %#x: %d\n",
			reg, ret);

	return ret;
}
EXPORT_SYMBOL_GPL(tc3589x_reg_write);

/**
 * tc3589x_block_read() - read multiple TC3589x registers
 * @tc3589x:	Device to read from
 * @reg:	First register
 * @length:	Number of registers
 * @values:	Buffer to write to
 */
int tc3589x_block_read(struct tc3589x *tc3589x, u8 reg, u8 length, u8 *values)
{
	int ret;

	ret = i2c_smbus_read_i2c_block_data(tc3589x->i2c, reg, length, values);
	if (ret < 0)
		dev_err(tc3589x->dev, "failed to read regs %#x: %d\n",
			reg, ret);

	return ret;
}
EXPORT_SYMBOL_GPL(tc3589x_block_read);

/**
 * tc3589x_block_write() - write multiple TC3589x registers
 * @tc3589x:	Device to write to
 * @reg:	First register
 * @length:	Number of registers
 * @values:	Values to write
 */
int tc3589x_block_write(struct tc3589x *tc3589x, u8 reg, u8 length,
			const u8 *values)
{
	int ret;

	ret = i2c_smbus_write_i2c_block_data(tc3589x->i2c, reg, length,
					     values);
	if (ret < 0)
		dev_err(tc3589x->dev, "failed to write regs %#x: %d\n",
			reg, ret);

	return ret;
}
EXPORT_SYMBOL_GPL(tc3589x_block_write);

/**
 * tc3589x_set_bits() - set the value of a bitfield in a TC3589x register
 * @tc3589x:	Device to write to
 * @reg:	Register to write
 * @mask:	Mask of bits to set
 * @values:	Value to set
 */
int tc3589x_set_bits(struct tc3589x *tc3589x, u8 reg, u8 mask, u8 val)
{
	int ret;

	mutex_lock(&tc3589x->lock);

	ret = tc3589x_reg_read(tc3589x, reg);
	if (ret < 0)
		goto out;

	ret &= ~mask;
	ret |= val;

	ret = tc3589x_reg_write(tc3589x, reg, ret);

out:
	mutex_unlock(&tc3589x->lock);
	return ret;
}
EXPORT_SYMBOL_GPL(tc3589x_set_bits);

static struct resource gpio_resources[] = {
	{
		.start	= TC3589x_INT_GPIIRQ,
		.end	= TC3589x_INT_GPIIRQ,
		.flags	= IORESOURCE_IRQ,
	},
};

static struct resource keypad_resources[] = {
	{
		.start  = TC3589x_INT_KBDIRQ,
		.end    = TC3589x_INT_KBDIRQ,
		.flags  = IORESOURCE_IRQ,
	},
};

static const struct mfd_cell tc3589x_dev_gpio[] = {
	{
		.name		= "tc3589x-gpio",
		.num_resources	= ARRAY_SIZE(gpio_resources),
		.resources	= &gpio_resources[0],
		.of_compatible	= "toshiba,tc3589x-gpio",
	},
};

static const struct mfd_cell tc3589x_dev_keypad[] = {
	{
		.name           = "tc3589x-keypad",
		.num_resources  = ARRAY_SIZE(keypad_resources),
		.resources      = &keypad_resources[0],
		.of_compatible	= "toshiba,tc3589x-keypad",
	},
};

static irqreturn_t tc3589x_irq(int irq, void *data)
{
	struct tc3589x *tc3589x = data;
	int status;

again:
	status = tc3589x_reg_read(tc3589x, TC3589x_IRQST);
	if (status < 0)
		return IRQ_NONE;

	while (status) {
		int bit = __ffs(status);
		int virq = irq_create_mapping(tc3589x->domain, bit);

		handle_nested_irq(virq);
		status &= ~(1 << bit);
	}

	/*
	 * A dummy read or write (to any register) appears to be necessary to
	 * have the last interrupt clear (for example, GPIO IC write) take
	 * effect. In such a case, recheck for any interrupt which is still
	 * pending.
	 */
	status = tc3589x_reg_read(tc3589x, TC3589x_IRQST);
	if (status)
		goto again;

	return IRQ_HANDLED;
}

static int tc3589x_irq_map(struct irq_domain *d, unsigned int virq,
				irq_hw_number_t hwirq)
{
	struct tc3589x *tc3589x = d->host_data;

	irq_set_chip_data(virq, tc3589x);
	irq_set_chip_and_handler(virq, &dummy_irq_chip,
				handle_edge_irq);
	irq_set_nested_thread(virq, 1);
#ifdef CONFIG_ARM
	set_irq_flags(virq, IRQF_VALID);
#else
	irq_set_noprobe(virq);
#endif

	return 0;
}

static void tc3589x_irq_unmap(struct irq_domain *d, unsigned int virq)
{
#ifdef CONFIG_ARM
	set_irq_flags(virq, 0);
#endif
	irq_set_chip_and_handler(virq, NULL, NULL);
	irq_set_chip_data(virq, NULL);
}

static const struct irq_domain_ops tc3589x_irq_ops = {
	.map    = tc3589x_irq_map,
	.unmap  = tc3589x_irq_unmap,
	.xlate  = irq_domain_xlate_onecell,
};

static int tc3589x_irq_init(struct tc3589x *tc3589x, struct device_node *np)
{
	tc3589x->domain = irq_domain_add_simple(
		np, TC3589x_NR_INTERNAL_IRQS, 0,
		&tc3589x_irq_ops, tc3589x);

	if (!tc3589x->domain) {
		dev_err(tc3589x->dev, "Failed to create irqdomain\n");
		return -ENOSYS;
	}

	return 0;
}

static int tc3589x_chip_init(struct tc3589x *tc3589x)
{
	int manf, ver, ret;

	manf = tc3589x_reg_read(tc3589x, TC3589x_MANFCODE);
	if (manf < 0)
		return manf;

	ver = tc3589x_reg_read(tc3589x, TC3589x_VERSION);
	if (ver < 0)
		return ver;

	if (manf != TC3589x_MANFCODE_MAGIC) {
		dev_err(tc3589x->dev, "unknown manufacturer: %#x\n", manf);
		return -EINVAL;
	}

	dev_info(tc3589x->dev, "manufacturer: %#x, version: %#x\n", manf, ver);

	/*
	 * Put everything except the IRQ module into reset;
	 * also spare the GPIO module for any pin initialization
	 * done during pre-kernel boot
	 */
	ret = tc3589x_reg_write(tc3589x, TC3589x_RSTCTRL,
				TC3589x_RSTCTRL_TIMRST
				| TC3589x_RSTCTRL_ROTRST
				| TC3589x_RSTCTRL_KBDRST);
	if (ret < 0)
		return ret;

	/* Clear the reset interrupt. */
	return tc3589x_reg_write(tc3589x, TC3589x_RSTINTCLR, 0x1);
}

static int tc3589x_device_init(struct tc3589x *tc3589x)
{
	int ret = 0;
	unsigned int blocks = tc3589x->pdata->block;

	if (blocks & TC3589x_BLOCK_GPIO) {
		ret = mfd_add_devices(tc3589x->dev, -1, tc3589x_dev_gpio,
				      ARRAY_SIZE(tc3589x_dev_gpio), NULL,
				      0, tc3589x->domain);
		if (ret) {
			dev_err(tc3589x->dev, "failed to add gpio child\n");
			return ret;
		}
		dev_info(tc3589x->dev, "added gpio block\n");
	}

	if (blocks & TC3589x_BLOCK_KEYPAD) {
		ret = mfd_add_devices(tc3589x->dev, -1, tc3589x_dev_keypad,
				      ARRAY_SIZE(tc3589x_dev_keypad), NULL,
				      0, tc3589x->domain);
		if (ret) {
			dev_err(tc3589x->dev, "failed to keypad child\n");
			return ret;
		}
		dev_info(tc3589x->dev, "added keypad block\n");
	}

	return ret;
}

static const struct of_device_id tc3589x_match[] = {
	/* Legacy compatible string */
	{ .compatible = "tc3589x", .data = (void *) TC3589X_UNKNOWN },
	{ .compatible = "toshiba,tc35890", .data = (void *) TC3589X_TC35890 },
	{ .compatible = "toshiba,tc35892", .data = (void *) TC3589X_TC35892 },
	{ .compatible = "toshiba,tc35893", .data = (void *) TC3589X_TC35893 },
	{ .compatible = "toshiba,tc35894", .data = (void *) TC3589X_TC35894 },
	{ .compatible = "toshiba,tc35895", .data = (void *) TC3589X_TC35895 },
	{ .compatible = "toshiba,tc35896", .data = (void *) TC3589X_TC35896 },
	{ }
};

MODULE_DEVICE_TABLE(of, tc3589x_match);

static struct tc3589x_platform_data *
tc3589x_of_probe(struct device *dev, enum tc3589x_version *version)
{
	struct device_node *np = dev->of_node;
	struct tc3589x_platform_data *pdata;
	struct device_node *child;
	const struct of_device_id *of_id;

	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata)
		return ERR_PTR(-ENOMEM);

	of_id = of_match_device(tc3589x_match, dev);
	if (!of_id)
		return ERR_PTR(-ENODEV);
	*version = (enum tc3589x_version) of_id->data;

	for_each_child_of_node(np, child) {
		if (of_device_is_compatible(child, "toshiba,tc3589x-gpio"))
			pdata->block |= TC3589x_BLOCK_GPIO;
		if (of_device_is_compatible(child, "toshiba,tc3589x-keypad"))
			pdata->block |= TC3589x_BLOCK_KEYPAD;
	}

	return pdata;
}

static int tc3589x_probe(struct i2c_client *i2c,
				   const struct i2c_device_id *id)
{
	struct device_node *np = i2c->dev.of_node;
	struct tc3589x_platform_data *pdata = dev_get_platdata(&i2c->dev);
	struct tc3589x *tc3589x;
	enum tc3589x_version version;
	int ret;

	if (!pdata) {
		pdata = tc3589x_of_probe(&i2c->dev, &version);
		if (IS_ERR(pdata)) {
			dev_err(&i2c->dev, "No platform data or DT found\n");
			return PTR_ERR(pdata);
		}
	} else {
		/* When not probing from device tree we have this ID */
		version = id->driver_data;
	}

	if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA
				     | I2C_FUNC_SMBUS_I2C_BLOCK))
		return -EIO;

	tc3589x = devm_kzalloc(&i2c->dev, sizeof(struct tc3589x),
				GFP_KERNEL);
	if (!tc3589x)
		return -ENOMEM;

	mutex_init(&tc3589x->lock);

	tc3589x->dev = &i2c->dev;
	tc3589x->i2c = i2c;
	tc3589x->pdata = pdata;

	switch (version) {
	case TC3589X_TC35893:
	case TC3589X_TC35895:
	case TC3589X_TC35896:
		tc3589x->num_gpio = 20;
		break;
	case TC3589X_TC35890:
	case TC3589X_TC35892:
	case TC3589X_TC35894:
	case TC3589X_UNKNOWN:
	default:
		tc3589x->num_gpio = 24;
		break;
	}

	i2c_set_clientdata(i2c, tc3589x);

	ret = tc3589x_chip_init(tc3589x);
	if (ret)
		return ret;

	ret = tc3589x_irq_init(tc3589x, np);
	if (ret)
		return ret;

	ret = request_threaded_irq(tc3589x->i2c->irq, NULL, tc3589x_irq,
				   IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
				   "tc3589x", tc3589x);
	if (ret) {
		dev_err(tc3589x->dev, "failed to request IRQ: %d\n", ret);
		return ret;
	}

	ret = tc3589x_device_init(tc3589x);
	if (ret) {
		dev_err(tc3589x->dev, "failed to add child devices\n");
		return ret;
	}

	return 0;
}

static int tc3589x_remove(struct i2c_client *client)
{
	struct tc3589x *tc3589x = i2c_get_clientdata(client);

	mfd_remove_devices(tc3589x->dev);

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int tc3589x_suspend(struct device *dev)
{
	struct tc3589x *tc3589x = dev_get_drvdata(dev);
	struct i2c_client *client = tc3589x->i2c;
	int ret = 0;

	/* put the system to sleep mode */
	if (!device_may_wakeup(&client->dev))
		ret = tc3589x_reg_write(tc3589x, TC3589x_CLKMODE,
				TC3589x_CLKMODE_MODCTL_SLEEP);

	return ret;
}

static int tc3589x_resume(struct device *dev)
{
	struct tc3589x *tc3589x = dev_get_drvdata(dev);
	struct i2c_client *client = tc3589x->i2c;
	int ret = 0;

	/* enable the system into operation */
	if (!device_may_wakeup(&client->dev))
		ret = tc3589x_reg_write(tc3589x, TC3589x_CLKMODE,
				TC3589x_CLKMODE_MODCTL_OPERATION);

	return ret;
}
#endif

static SIMPLE_DEV_PM_OPS(tc3589x_dev_pm_ops, tc3589x_suspend, tc3589x_resume);

static const struct i2c_device_id tc3589x_id[] = {
	{ "tc35890", TC3589X_TC35890 },
	{ "tc35892", TC3589X_TC35892 },
	{ "tc35893", TC3589X_TC35893 },
	{ "tc35894", TC3589X_TC35894 },
	{ "tc35895", TC3589X_TC35895 },
	{ "tc35896", TC3589X_TC35896 },
	{ "tc3589x", TC3589X_UNKNOWN },
	{ }
};
MODULE_DEVICE_TABLE(i2c, tc3589x_id);

static struct i2c_driver tc3589x_driver = {
	.driver = {
		.name	= "tc3589x",
		.owner	= THIS_MODULE,
		.pm	= &tc3589x_dev_pm_ops,
		.of_match_table = of_match_ptr(tc3589x_match),
	},
	.probe		= tc3589x_probe,
	.remove		= tc3589x_remove,
	.id_table	= tc3589x_id,
};

static int __init tc3589x_init(void)
{
	return i2c_add_driver(&tc3589x_driver);
}
subsys_initcall(tc3589x_init);

static void __exit tc3589x_exit(void)
{
	i2c_del_driver(&tc3589x_driver);
}
module_exit(tc3589x_exit);

MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("TC3589x MFD core driver");
MODULE_AUTHOR("Hanumath Prasad, Rabin Vincent");
Commit	Line	Data
b4ecd326 RV	1	/*
	2	* Copyright (C) ST-Ericsson SA 2010
	3	*
	4	* License Terms: GNU General Public License, version 2
	5	* Author: Hanumath Prasad <hanumath.prasad@stericsson.com> for ST-Ericsson
	6	* Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
	7	*/
	8
	9	#include <linux/module.h>
	10	#include <linux/interrupt.h>
	11	#include <linux/irq.h>
15e27b10	12	#include <linux/irqdomain.h>
b4ecd326 RV	13	#include <linux/slab.h>
b4ecd326 RV	14	#include <linux/i2c.h>
a435ae1d	15	#include <linux/of.h>
a381b13e	16	#include <linux/of_device.h>
b4ecd326	17	#include <linux/mfd/core.h>
c6eda6c5	18	#include <linux/mfd/tc3589x.h>
a381b13e	19	#include <linux/err.h>
b4ecd326	20
e64c1eb4 LW	21	/**
	22	* enum tc3589x_version - indicates the TC3589x version
	23	*/
	24	enum tc3589x_version {
	25	TC3589X_TC35890,
	26	TC3589X_TC35892,
	27	TC3589X_TC35893,
	28	TC3589X_TC35894,
	29	TC3589X_TC35895,
	30	TC3589X_TC35896,
	31	TC3589X_UNKNOWN,
	32	};
	33
593e9d70 SI	34	#define TC3589x_CLKMODE_MODCTL_SLEEP 0x0
	35	#define TC3589x_CLKMODE_MODCTL_OPERATION (1 << 0)
	36
b4ecd326	37	/**
20406ebf SI	38	* tc3589x_reg_read() - read a single TC3589x register
20406ebf SI	39	* @tc3589x: Device to read from
b4ecd326 RV	40	* @reg: Register to read
b4ecd326 RV	41	*/
20406ebf	42	int tc3589x_reg_read(struct tc3589x *tc3589x, u8 reg)
b4ecd326 RV	43	{
	44	int ret;
	45
20406ebf	46	ret = i2c_smbus_read_byte_data(tc3589x->i2c, reg);
b4ecd326	47	if (ret < 0)
20406ebf	48	dev_err(tc3589x->dev, "failed to read reg %#x: %d\n",
b4ecd326 RV	49	reg, ret);
	50
	51	return ret;
	52	}
20406ebf	53	EXPORT_SYMBOL_GPL(tc3589x_reg_read);
b4ecd326 RV	54
b4ecd326 RV	55	/**
20406ebf SI	56	* tc3589x_reg_read() - write a single TC3589x register
20406ebf SI	57	* @tc3589x: Device to write to
b4ecd326 RV	58	* @reg: Register to read
	59	* @data: Value to write
	60	*/
20406ebf	61	int tc3589x_reg_write(struct tc3589x *tc3589x, u8 reg, u8 data)
b4ecd326 RV	62	{
	63	int ret;
	64
20406ebf	65	ret = i2c_smbus_write_byte_data(tc3589x->i2c, reg, data);
b4ecd326	66	if (ret < 0)
20406ebf	67	dev_err(tc3589x->dev, "failed to write reg %#x: %d\n",
b4ecd326 RV	68	reg, ret);
	69
	70	return ret;
	71	}
20406ebf	72	EXPORT_SYMBOL_GPL(tc3589x_reg_write);
b4ecd326 RV	73
b4ecd326 RV	74	/**
20406ebf SI	75	* tc3589x_block_read() - read multiple TC3589x registers
20406ebf SI	76	* @tc3589x: Device to read from
b4ecd326 RV	77	* @reg: First register
	78	* @length: Number of registers
	79	* @values: Buffer to write to
	80	*/
20406ebf	81	int tc3589x_block_read(struct tc3589x tc3589x, u8 reg, u8 length, u8 values)
b4ecd326 RV	82	{
	83	int ret;
	84
20406ebf	85	ret = i2c_smbus_read_i2c_block_data(tc3589x->i2c, reg, length, values);
b4ecd326	86	if (ret < 0)
20406ebf	87	dev_err(tc3589x->dev, "failed to read regs %#x: %d\n",
b4ecd326 RV	88	reg, ret);
	89
	90	return ret;
	91	}
20406ebf	92	EXPORT_SYMBOL_GPL(tc3589x_block_read);
b4ecd326 RV	93
b4ecd326 RV	94	/**
20406ebf SI	95	* tc3589x_block_write() - write multiple TC3589x registers
20406ebf SI	96	* @tc3589x: Device to write to
b4ecd326 RV	97	* @reg: First register
	98	* @length: Number of registers
	99	* @values: Values to write
	100	*/
20406ebf	101	int tc3589x_block_write(struct tc3589x *tc3589x, u8 reg, u8 length,
b4ecd326 RV	102	const u8 *values)
	103	{
	104	int ret;
	105
20406ebf	106	ret = i2c_smbus_write_i2c_block_data(tc3589x->i2c, reg, length,
b4ecd326 RV	107	values);
b4ecd326 RV	108	if (ret < 0)
20406ebf	109	dev_err(tc3589x->dev, "failed to write regs %#x: %d\n",
b4ecd326 RV	110	reg, ret);
	111
	112	return ret;
	113	}
20406ebf	114	EXPORT_SYMBOL_GPL(tc3589x_block_write);
b4ecd326 RV	115
b4ecd326 RV	116	/**
20406ebf SI	117	* tc3589x_set_bits() - set the value of a bitfield in a TC3589x register
20406ebf SI	118	* @tc3589x: Device to write to
b4ecd326 RV	119	* @reg: Register to write
	120	* @mask: Mask of bits to set
	121	* @values: Value to set
	122	*/
20406ebf	123	int tc3589x_set_bits(struct tc3589x *tc3589x, u8 reg, u8 mask, u8 val)
b4ecd326 RV	124	{
	125	int ret;
	126
20406ebf	127	mutex_lock(&tc3589x->lock);
b4ecd326	128
20406ebf	129	ret = tc3589x_reg_read(tc3589x, reg);
b4ecd326 RV	130	if (ret < 0)
	131	goto out;
	132
	133	ret &= ~mask;
	134	ret \|= val;
	135
20406ebf	136	ret = tc3589x_reg_write(tc3589x, reg, ret);
b4ecd326 RV	137
b4ecd326 RV	138	out:
20406ebf	139	mutex_unlock(&tc3589x->lock);
b4ecd326 RV	140	return ret;
b4ecd326 RV	141	}
20406ebf	142	EXPORT_SYMBOL_GPL(tc3589x_set_bits);
b4ecd326 RV	143
	144	static struct resource gpio_resources[] = {
	145	{
20406ebf SI	146	.start = TC3589x_INT_GPIIRQ,
20406ebf SI	147	.end = TC3589x_INT_GPIIRQ,
b4ecd326 RV	148	.flags = IORESOURCE_IRQ,
	149	},
	150	};
	151
09c730a4 SI	152	static struct resource keypad_resources[] = {
	153	{
	154	.start = TC3589x_INT_KBDIRQ,
	155	.end = TC3589x_INT_KBDIRQ,
	156	.flags = IORESOURCE_IRQ,
	157	},
	158	};
	159
afb580a9	160	static const struct mfd_cell tc3589x_dev_gpio[] = {
b4ecd326	161	{
20406ebf	162	.name = "tc3589x-gpio",
b4ecd326 RV	163	.num_resources = ARRAY_SIZE(gpio_resources),
b4ecd326 RV	164	.resources = &gpio_resources[0],
a381b13e	165	.of_compatible = "toshiba,tc3589x-gpio",
b4ecd326 RV	166	},
	167	};
	168
afb580a9	169	static const struct mfd_cell tc3589x_dev_keypad[] = {
09c730a4 SI	170	{
	171	.name = "tc3589x-keypad",
	172	.num_resources = ARRAY_SIZE(keypad_resources),
	173	.resources = &keypad_resources[0],
a381b13e	174	.of_compatible = "toshiba,tc3589x-keypad",
09c730a4 SI	175	},
	176	};
	177
20406ebf	178	static irqreturn_t tc3589x_irq(int irq, void *data)
b4ecd326	179	{
20406ebf	180	struct tc3589x *tc3589x = data;
b4ecd326 RV	181	int status;
b4ecd326 RV	182
bd77efd0	183	again:
20406ebf	184	status = tc3589x_reg_read(tc3589x, TC3589x_IRQST);
b4ecd326 RV	185	if (status < 0)
	186	return IRQ_NONE;
	187
	188	while (status) {
	189	int bit = __ffs(status);
15e27b10	190	int virq = irq_create_mapping(tc3589x->domain, bit);
b4ecd326	191
15e27b10	192	handle_nested_irq(virq);
b4ecd326 RV	193	status &= ~(1 << bit);
	194	}
	195
	196	/*
	197	* A dummy read or write (to any register) appears to be necessary to
	198	* have the last interrupt clear (for example, GPIO IC write) take
bd77efd0 SI	199	* effect. In such a case, recheck for any interrupt which is still
bd77efd0 SI	200	* pending.
b4ecd326	201	*/
bd77efd0 SI	202	status = tc3589x_reg_read(tc3589x, TC3589x_IRQST);
	203	if (status)
	204	goto again;
b4ecd326 RV	205
	206	return IRQ_HANDLED;
	207	}
	208
15e27b10 LJ	209	static int tc3589x_irq_map(struct irq_domain *d, unsigned int virq,
15e27b10 LJ	210	irq_hw_number_t hwirq)
b4ecd326	211	{
15e27b10	212	struct tc3589x *tc3589x = d->host_data;
b4ecd326	213
15e27b10 LJ	214	irq_set_chip_data(virq, tc3589x);
	215	irq_set_chip_and_handler(virq, &dummy_irq_chip,
	216	handle_edge_irq);
	217	irq_set_nested_thread(virq, 1);
b4ecd326	218	#ifdef CONFIG_ARM
15e27b10	219	set_irq_flags(virq, IRQF_VALID);
b4ecd326	220	#else
15e27b10	221	irq_set_noprobe(virq);
b4ecd326	222	#endif
b4ecd326 RV	223
	224	return 0;
	225	}
	226
15e27b10	227	static void tc3589x_irq_unmap(struct irq_domain *d, unsigned int virq)
b4ecd326	228	{
b4ecd326	229	#ifdef CONFIG_ARM
15e27b10	230	set_irq_flags(virq, 0);
b4ecd326	231	#endif
15e27b10 LJ	232	irq_set_chip_and_handler(virq, NULL, NULL);
	233	irq_set_chip_data(virq, NULL);
	234	}
	235
7ce7b26f	236	static const struct irq_domain_ops tc3589x_irq_ops = {
1f0529b4	237	.map = tc3589x_irq_map,
15e27b10	238	.unmap = tc3589x_irq_unmap,
627918ed	239	.xlate = irq_domain_xlate_onecell,
15e27b10 LJ	240	};
15e27b10 LJ	241
a435ae1d	242	static int tc3589x_irq_init(struct tc3589x tc3589x, struct device_node np)
15e27b10	243	{
1f0529b4	244	tc3589x->domain = irq_domain_add_simple(
90f2d0f7	245	np, TC3589x_NR_INTERNAL_IRQS, 0,
1f0529b4	246	&tc3589x_irq_ops, tc3589x);
15e27b10 LJ	247
	248	if (!tc3589x->domain) {
	249	dev_err(tc3589x->dev, "Failed to create irqdomain\n");
	250	return -ENOSYS;
	251	}
	252
	253	return 0;
b4ecd326 RV	254	}
b4ecd326 RV	255
20406ebf	256	static int tc3589x_chip_init(struct tc3589x *tc3589x)
b4ecd326 RV	257	{
	258	int manf, ver, ret;
	259
20406ebf	260	manf = tc3589x_reg_read(tc3589x, TC3589x_MANFCODE);
b4ecd326 RV	261	if (manf < 0)
	262	return manf;
	263
20406ebf	264	ver = tc3589x_reg_read(tc3589x, TC3589x_VERSION);
b4ecd326 RV	265	if (ver < 0)
	266	return ver;
	267
20406ebf SI	268	if (manf != TC3589x_MANFCODE_MAGIC) {
20406ebf SI	269	dev_err(tc3589x->dev, "unknown manufacturer: %#x\n", manf);
b4ecd326 RV	270	return -EINVAL;
	271	}
	272
20406ebf	273	dev_info(tc3589x->dev, "manufacturer: %#x, version: %#x\n", manf, ver);
b4ecd326	274
523bc382 SI	275	/*
	276	* Put everything except the IRQ module into reset;
	277	* also spare the GPIO module for any pin initialization
	278	* done during pre-kernel boot
	279	*/
20406ebf SI	280	ret = tc3589x_reg_write(tc3589x, TC3589x_RSTCTRL,
	281	TC3589x_RSTCTRL_TIMRST
	282	\| TC3589x_RSTCTRL_ROTRST
523bc382	283	\| TC3589x_RSTCTRL_KBDRST);
b4ecd326 RV	284	if (ret < 0)
	285	return ret;
	286
	287	/* Clear the reset interrupt. */
20406ebf	288	return tc3589x_reg_write(tc3589x, TC3589x_RSTINTCLR, 0x1);
b4ecd326 RV	289	}
b4ecd326 RV	290
f791be49	291	static int tc3589x_device_init(struct tc3589x *tc3589x)
611b7590 SI	292	{
	293	int ret = 0;
	294	unsigned int blocks = tc3589x->pdata->block;
	295
	296	if (blocks & TC3589x_BLOCK_GPIO) {
	297	ret = mfd_add_devices(tc3589x->dev, -1, tc3589x_dev_gpio,
55692af5	298	ARRAY_SIZE(tc3589x_dev_gpio), NULL,
90f2d0f7	299	0, tc3589x->domain);
611b7590 SI	300	if (ret) {
	301	dev_err(tc3589x->dev, "failed to add gpio child\n");
	302	return ret;
	303	}
	304	dev_info(tc3589x->dev, "added gpio block\n");
	305	}
	306
09c730a4 SI	307	if (blocks & TC3589x_BLOCK_KEYPAD) {
09c730a4 SI	308	ret = mfd_add_devices(tc3589x->dev, -1, tc3589x_dev_keypad,
55692af5	309	ARRAY_SIZE(tc3589x_dev_keypad), NULL,
90f2d0f7	310	0, tc3589x->domain);
09c730a4 SI	311	if (ret) {
	312	dev_err(tc3589x->dev, "failed to keypad child\n");
	313	return ret;
	314	}
	315	dev_info(tc3589x->dev, "added keypad block\n");
	316	}
611b7590	317
09c730a4	318	return ret;
611b7590 SI	319	}
611b7590 SI	320
a381b13e LW	321	static const struct of_device_id tc3589x_match[] = {
	322	/* Legacy compatible string */
	323	{ .compatible = "tc3589x", .data = (void *) TC3589X_UNKNOWN },
	324	{ .compatible = "toshiba,tc35890", .data = (void *) TC3589X_TC35890 },
	325	{ .compatible = "toshiba,tc35892", .data = (void *) TC3589X_TC35892 },
	326	{ .compatible = "toshiba,tc35893", .data = (void *) TC3589X_TC35893 },
	327	{ .compatible = "toshiba,tc35894", .data = (void *) TC3589X_TC35894 },
	328	{ .compatible = "toshiba,tc35895", .data = (void *) TC3589X_TC35895 },
	329	{ .compatible = "toshiba,tc35896", .data = (void *) TC3589X_TC35896 },
	330	{ }
	331	};
	332
	333	MODULE_DEVICE_TABLE(of, tc3589x_match);
	334
	335	static struct tc3589x_platform_data *
	336	tc3589x_of_probe(struct device dev, enum tc3589x_version version)
a435ae1d	337	{
a381b13e LW	338	struct device_node *np = dev->of_node;
a381b13e LW	339	struct tc3589x_platform_data *pdata;
a435ae1d	340	struct device_node *child;
a381b13e LW	341	const struct of_device_id *of_id;
	342
	343	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
	344	if (!pdata)
	345	return ERR_PTR(-ENOMEM);
	346
	347	of_id = of_match_device(tc3589x_match, dev);
	348	if (!of_id)
	349	return ERR_PTR(-ENODEV);
	350	*version = (enum tc3589x_version) of_id->data;
a435ae1d LJ	351
a435ae1d LJ	352	for_each_child_of_node(np, child) {
a381b13e	353	if (of_device_is_compatible(child, "toshiba,tc3589x-gpio"))
a435ae1d	354	pdata->block \|= TC3589x_BLOCK_GPIO;
a381b13e	355	if (of_device_is_compatible(child, "toshiba,tc3589x-keypad"))
a435ae1d	356	pdata->block \|= TC3589x_BLOCK_KEYPAD;
a435ae1d LJ	357	}
a435ae1d LJ	358
a381b13e	359	return pdata;
a435ae1d LJ	360	}
a435ae1d LJ	361
f791be49	362	static int tc3589x_probe(struct i2c_client *i2c,
b4ecd326 RV	363	const struct i2c_device_id *id)
b4ecd326 RV	364	{
a435ae1d	365	struct device_node *np = i2c->dev.of_node;
a381b13e	366	struct tc3589x_platform_data *pdata = dev_get_platdata(&i2c->dev);
20406ebf	367	struct tc3589x *tc3589x;
a381b13e	368	enum tc3589x_version version;
b4ecd326 RV	369	int ret;
b4ecd326 RV	370
a435ae1d	371	if (!pdata) {
a381b13e LW	372	pdata = tc3589x_of_probe(&i2c->dev, &version);
a381b13e LW	373	if (IS_ERR(pdata)) {
a435ae1d	374	dev_err(&i2c->dev, "No platform data or DT found\n");
a381b13e	375	return PTR_ERR(pdata);
a435ae1d	376	}
a381b13e LW	377	} else {
	378	/* When not probing from device tree we have this ID */
	379	version = id->driver_data;
a435ae1d LJ	380	}
a435ae1d LJ	381
b4ecd326 RV	382	if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA
	383	\| I2C_FUNC_SMBUS_I2C_BLOCK))
	384	return -EIO;
	385
1383e00f JH	386	tc3589x = devm_kzalloc(&i2c->dev, sizeof(struct tc3589x),
1383e00f JH	387	GFP_KERNEL);
20406ebf	388	if (!tc3589x)
b4ecd326 RV	389	return -ENOMEM;
b4ecd326 RV	390
20406ebf	391	mutex_init(&tc3589x->lock);
b4ecd326	392
20406ebf SI	393	tc3589x->dev = &i2c->dev;
	394	tc3589x->i2c = i2c;
	395	tc3589x->pdata = pdata;
e64c1eb4	396
a381b13e	397	switch (version) {
e64c1eb4 LW	398	case TC3589X_TC35893:
	399	case TC3589X_TC35895:
	400	case TC3589X_TC35896:
	401	tc3589x->num_gpio = 20;
	402	break;
	403	case TC3589X_TC35890:
	404	case TC3589X_TC35892:
	405	case TC3589X_TC35894:
	406	case TC3589X_UNKNOWN:
	407	default:
	408	tc3589x->num_gpio = 24;
	409	break;
	410	}
b4ecd326	411
20406ebf	412	i2c_set_clientdata(i2c, tc3589x);
b4ecd326	413
20406ebf	414	ret = tc3589x_chip_init(tc3589x);
b4ecd326	415	if (ret)
1383e00f	416	return ret;
b4ecd326	417
a435ae1d	418	ret = tc3589x_irq_init(tc3589x, np);
b4ecd326	419	if (ret)
1383e00f	420	return ret;
b4ecd326	421
20406ebf	422	ret = request_threaded_irq(tc3589x->i2c->irq, NULL, tc3589x_irq,
b4ecd326	423	IRQF_TRIGGER_FALLING \| IRQF_ONESHOT,
20406ebf	424	"tc3589x", tc3589x);
b4ecd326	425	if (ret) {
20406ebf	426	dev_err(tc3589x->dev, "failed to request IRQ: %d\n", ret);
1383e00f	427	return ret;
b4ecd326 RV	428	}
b4ecd326 RV	429
611b7590	430	ret = tc3589x_device_init(tc3589x);
b4ecd326	431	if (ret) {
611b7590	432	dev_err(tc3589x->dev, "failed to add child devices\n");
1383e00f	433	return ret;
b4ecd326 RV	434	}
	435
	436	return 0;
b4ecd326 RV	437	}
b4ecd326 RV	438
4740f73f	439	static int tc3589x_remove(struct i2c_client *client)
b4ecd326	440	{
20406ebf	441	struct tc3589x *tc3589x = i2c_get_clientdata(client);
b4ecd326	442
20406ebf	443	mfd_remove_devices(tc3589x->dev);
b4ecd326	444
b4ecd326 RV	445	return 0;
	446	}
	447
930bf022	448	#ifdef CONFIG_PM_SLEEP
593e9d70 SI	449	static int tc3589x_suspend(struct device *dev)
	450	{
	451	struct tc3589x *tc3589x = dev_get_drvdata(dev);
	452	struct i2c_client *client = tc3589x->i2c;
	453	int ret = 0;
	454
	455	/* put the system to sleep mode */
	456	if (!device_may_wakeup(&client->dev))
	457	ret = tc3589x_reg_write(tc3589x, TC3589x_CLKMODE,
	458	TC3589x_CLKMODE_MODCTL_SLEEP);
	459
	460	return ret;
	461	}
	462
	463	static int tc3589x_resume(struct device *dev)
	464	{
	465	struct tc3589x *tc3589x = dev_get_drvdata(dev);
	466	struct i2c_client *client = tc3589x->i2c;
	467	int ret = 0;
	468
	469	/* enable the system into operation */
	470	if (!device_may_wakeup(&client->dev))
	471	ret = tc3589x_reg_write(tc3589x, TC3589x_CLKMODE,
	472	TC3589x_CLKMODE_MODCTL_OPERATION);
	473
	474	return ret;
	475	}
54d8e2c3	476	#endif
593e9d70	477
930bf022 AL	478	static SIMPLE_DEV_PM_OPS(tc3589x_dev_pm_ops, tc3589x_suspend, tc3589x_resume);
930bf022 AL	479
20406ebf	480	static const struct i2c_device_id tc3589x_id[] = {
e64c1eb4 LW	481	{ "tc35890", TC3589X_TC35890 },
	482	{ "tc35892", TC3589X_TC35892 },
	483	{ "tc35893", TC3589X_TC35893 },
	484	{ "tc35894", TC3589X_TC35894 },
	485	{ "tc35895", TC3589X_TC35895 },
	486	{ "tc35896", TC3589X_TC35896 },
	487	{ "tc3589x", TC3589X_UNKNOWN },
b4ecd326 RV	488	{ }
b4ecd326 RV	489	};
20406ebf	490	MODULE_DEVICE_TABLE(i2c, tc3589x_id);
b4ecd326	491
20406ebf	492	static struct i2c_driver tc3589x_driver = {
a381b13e LW	493	.driver = {
	494	.name = "tc3589x",
	495	.owner = THIS_MODULE,
	496	.pm = &tc3589x_dev_pm_ops,
	497	.of_match_table = of_match_ptr(tc3589x_match),
	498	},
20406ebf	499	.probe = tc3589x_probe,
84449216	500	.remove = tc3589x_remove,
20406ebf	501	.id_table = tc3589x_id,
b4ecd326 RV	502	};
b4ecd326 RV	503
20406ebf	504	static int __init tc3589x_init(void)
b4ecd326	505	{
20406ebf	506	return i2c_add_driver(&tc3589x_driver);
b4ecd326	507	}
20406ebf	508	subsys_initcall(tc3589x_init);
b4ecd326	509
20406ebf	510	static void __exit tc3589x_exit(void)
b4ecd326	511	{
20406ebf	512	i2c_del_driver(&tc3589x_driver);
b4ecd326	513	}
20406ebf	514	module_exit(tc3589x_exit);
b4ecd326 RV	515
b4ecd326 RV	516	MODULE_LICENSE("GPL v2");
20406ebf	517	MODULE_DESCRIPTION("TC3589x MFD core driver");
b4ecd326	518	MODULE_AUTHOR("Hanumath Prasad, Rabin Vincent");