[mirror_ubuntu-hirsute-kernel.git] / drivers / i2c / busses / i2c-designware-platdrv.c

/*
 * Synopsys DesignWare I2C adapter driver (master only).
 *
 * Based on the TI DAVINCI I2C adapter driver.
 *
 * Copyright (C) 2006 Texas Instruments.
 * Copyright (C) 2007 MontaVista Software Inc.
 * Copyright (C) 2009 Provigent Ltd.
 *
 * ----------------------------------------------------------------------------
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * ----------------------------------------------------------------------------
 *
 */
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/acpi.h>
#include <linux/platform_data/i2c-designware.h>
#include "i2c-designware-core.h"

static struct i2c_algorithm i2c_dw_algo = {
	.master_xfer	= i2c_dw_xfer,
	.functionality	= i2c_dw_func,
};
static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev)
{
	return clk_get_rate(dev->clk)/1000;
}

#ifdef CONFIG_ACPI
static void dw_i2c_acpi_params(struct platform_device *pdev, char method[],
			       u16 *hcnt, u16 *lcnt, u32 *sda_hold)
{
	struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER };
	acpi_handle handle = ACPI_HANDLE(&pdev->dev);
	union acpi_object *obj;

	if (ACPI_FAILURE(acpi_evaluate_object(handle, method, NULL, &buf)))
		return;

	obj = (union acpi_object *)buf.pointer;
	if (obj->type == ACPI_TYPE_PACKAGE && obj->package.count == 3) {
		const union acpi_object *objs = obj->package.elements;

		*hcnt = (u16)objs[0].integer.value;
		*lcnt = (u16)objs[1].integer.value;
		if (sda_hold)
			*sda_hold = (u32)objs[2].integer.value;
	}

	kfree(buf.pointer);
}

static int dw_i2c_acpi_configure(struct platform_device *pdev)
{
	struct dw_i2c_dev *dev = platform_get_drvdata(pdev);
	const struct acpi_device_id *id;

	dev->adapter.nr = -1;
	dev->tx_fifo_depth = 32;
	dev->rx_fifo_depth = 32;

	/*
	 * Try to get SDA hold time and *CNT values from an ACPI method if
	 * it exists for both supported speed modes.
	 */
	dw_i2c_acpi_params(pdev, "SSCN", &dev->ss_hcnt, &dev->ss_lcnt, NULL);
	dw_i2c_acpi_params(pdev, "FMCN", &dev->fs_hcnt, &dev->fs_lcnt,
			   &dev->sda_hold_time);

	/*
	 * Provide a way for Designware I2C host controllers that are not
	 * based on Intel LPSS to specify their input clock frequency via
	 * id->driver_data.
	 */
	id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev);
	if (id && id->driver_data)
		clk_register_fixed_rate(&pdev->dev, dev_name(&pdev->dev), NULL,
					CLK_IS_ROOT, id->driver_data);

	return 0;
}

static void dw_i2c_acpi_unconfigure(struct platform_device *pdev)
{
	struct dw_i2c_dev *dev = platform_get_drvdata(pdev);
	const struct acpi_device_id *id;

	id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev);
	if (id && id->driver_data)
		clk_unregister(dev->clk);
}

static const struct acpi_device_id dw_i2c_acpi_match[] = {
	{ "INT33C2", 0 },
	{ "INT33C3", 0 },
	{ "INT3432", 0 },
	{ "INT3433", 0 },
	{ "80860F41", 0 },
	{ "808622C1", 0 },
	{ "AMD0010", 133 * 1000 * 1000 },
	{ }
};
MODULE_DEVICE_TABLE(acpi, dw_i2c_acpi_match);
#else
static inline int dw_i2c_acpi_configure(struct platform_device *pdev)
{
	return -ENODEV;
}
static inline void dw_i2c_acpi_unconfigure(struct platform_device *pdev) { }
#endif

static int dw_i2c_probe(struct platform_device *pdev)
{
	struct dw_i2c_dev *dev;
	struct i2c_adapter *adap;
	struct resource *mem;
	struct dw_i2c_platform_data *pdata;
	int irq, r;
	u32 clk_freq, ht = 0;

	irq = platform_get_irq(pdev, 0);
	if (irq < 0)
		return irq;

	dev = devm_kzalloc(&pdev->dev, sizeof(struct dw_i2c_dev), GFP_KERNEL);
	if (!dev)
		return -ENOMEM;

	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	dev->base = devm_ioremap_resource(&pdev->dev, mem);
	if (IS_ERR(dev->base))
		return PTR_ERR(dev->base);

	init_completion(&dev->cmd_complete);
	mutex_init(&dev->lock);
	dev->dev = &pdev->dev;
	dev->irq = irq;
	platform_set_drvdata(pdev, dev);

	/* fast mode by default because of legacy reasons */
	clk_freq = 400000;

	if (has_acpi_companion(&pdev->dev)) {
		dw_i2c_acpi_configure(pdev);
	} else if (pdev->dev.of_node) {
		of_property_read_u32(pdev->dev.of_node,
					"i2c-sda-hold-time-ns", &ht);

		of_property_read_u32(pdev->dev.of_node,
				     "i2c-sda-falling-time-ns",
				     &dev->sda_falling_time);
		of_property_read_u32(pdev->dev.of_node,
				     "i2c-scl-falling-time-ns",
				     &dev->scl_falling_time);

		of_property_read_u32(pdev->dev.of_node, "clock-frequency",
				     &clk_freq);

		/* Only standard mode at 100kHz and fast mode at 400kHz
		 * are supported.
		 */
		if (clk_freq != 100000 && clk_freq != 400000) {
			dev_err(&pdev->dev, "Only 100kHz and 400kHz supported");
			return -EINVAL;
		}
	} else {
		pdata = dev_get_platdata(&pdev->dev);
		if (pdata)
			clk_freq = pdata->i2c_scl_freq;
	}

	r = i2c_dw_eval_lock_support(dev);
	if (r)
		return r;

	dev->functionality =
		I2C_FUNC_I2C |
		I2C_FUNC_10BIT_ADDR |
		I2C_FUNC_SMBUS_BYTE |
		I2C_FUNC_SMBUS_BYTE_DATA |
		I2C_FUNC_SMBUS_WORD_DATA |
		I2C_FUNC_SMBUS_I2C_BLOCK;
	if (clk_freq == 100000)
		dev->master_cfg =  DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE |
			DW_IC_CON_RESTART_EN | DW_IC_CON_SPEED_STD;
	else
		dev->master_cfg =  DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE |
			DW_IC_CON_RESTART_EN | DW_IC_CON_SPEED_FAST;

	dev->clk = devm_clk_get(&pdev->dev, NULL);
	dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz;
	if (IS_ERR(dev->clk))
		return PTR_ERR(dev->clk);
	clk_prepare_enable(dev->clk);

	if (!dev->sda_hold_time && ht) {
		u32 ic_clk = dev->get_clk_rate_khz(dev);

		dev->sda_hold_time = div_u64((u64)ic_clk * ht + 500000,
					     1000000);
	}

	if (!dev->tx_fifo_depth) {
		u32 param1 = i2c_dw_read_comp_param(dev);

		dev->tx_fifo_depth = ((param1 >> 16) & 0xff) + 1;
		dev->rx_fifo_depth = ((param1 >> 8)  & 0xff) + 1;
		dev->adapter.nr = pdev->id;
	}
	r = i2c_dw_init(dev);
	if (r)
		return r;

	i2c_dw_disable_int(dev);
	r = devm_request_irq(&pdev->dev, dev->irq, i2c_dw_isr, IRQF_SHARED,
			pdev->name, dev);
	if (r) {
		dev_err(&pdev->dev, "failure requesting irq %i\n", dev->irq);
		return r;
	}

	adap = &dev->adapter;
	i2c_set_adapdata(adap, dev);
	adap->owner = THIS_MODULE;
	adap->class = I2C_CLASS_DEPRECATED;
	strlcpy(adap->name, "Synopsys DesignWare I2C adapter",
			sizeof(adap->name));
	adap->algo = &i2c_dw_algo;
	adap->dev.parent = &pdev->dev;
	adap->dev.of_node = pdev->dev.of_node;

	if (dev->pm_runtime_disabled) {
		pm_runtime_forbid(&pdev->dev);
	} else {
		pm_runtime_set_autosuspend_delay(&pdev->dev, 1000);
		pm_runtime_use_autosuspend(&pdev->dev);
		pm_runtime_set_active(&pdev->dev);
		pm_runtime_enable(&pdev->dev);
	}

	r = i2c_add_numbered_adapter(adap);
	if (r) {
		dev_err(&pdev->dev, "failure adding adapter\n");
		pm_runtime_disable(&pdev->dev);
		return r;
	}

	return 0;
}

static int dw_i2c_remove(struct platform_device *pdev)
{
	struct dw_i2c_dev *dev = platform_get_drvdata(pdev);

	pm_runtime_get_sync(&pdev->dev);

	i2c_del_adapter(&dev->adapter);

	i2c_dw_disable(dev);

	pm_runtime_dont_use_autosuspend(&pdev->dev);
	pm_runtime_put_sync(&pdev->dev);
	pm_runtime_disable(&pdev->dev);

	if (has_acpi_companion(&pdev->dev))
		dw_i2c_acpi_unconfigure(pdev);

	return 0;
}

#ifdef CONFIG_OF
static const struct of_device_id dw_i2c_of_match[] = {
	{ .compatible = "snps,designware-i2c", },
	{},
};
MODULE_DEVICE_TABLE(of, dw_i2c_of_match);
#endif

#ifdef CONFIG_PM_SLEEP
static int dw_i2c_prepare(struct device *dev)
{
	return pm_runtime_suspended(dev);
}

static void dw_i2c_complete(struct device *dev)
{
	if (dev->power.direct_complete)
		pm_request_resume(dev);
}
#else
#define dw_i2c_prepare	NULL
#define dw_i2c_complete	NULL
#endif

#ifdef CONFIG_PM
static int dw_i2c_suspend(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev);

	i2c_dw_disable(i_dev);
	clk_disable_unprepare(i_dev->clk);

	return 0;
}

static int dw_i2c_resume(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev);

	clk_prepare_enable(i_dev->clk);

	if (!i_dev->pm_runtime_disabled)
		i2c_dw_init(i_dev);

	return 0;
}

static const struct dev_pm_ops dw_i2c_dev_pm_ops = {
	.prepare = dw_i2c_prepare,
	.complete = dw_i2c_complete,
	SET_SYSTEM_SLEEP_PM_OPS(dw_i2c_suspend, dw_i2c_resume)
	SET_RUNTIME_PM_OPS(dw_i2c_suspend, dw_i2c_resume, NULL)
};

#define DW_I2C_DEV_PMOPS (&dw_i2c_dev_pm_ops)
#else
#define DW_I2C_DEV_PMOPS NULL
#endif

/* work with hotplug and coldplug */
MODULE_ALIAS("platform:i2c_designware");

static struct platform_driver dw_i2c_driver = {
	.probe = dw_i2c_probe,
	.remove = dw_i2c_remove,
	.driver		= {
		.name	= "i2c_designware",
		.of_match_table = of_match_ptr(dw_i2c_of_match),
		.acpi_match_table = ACPI_PTR(dw_i2c_acpi_match),
		.pm	= DW_I2C_DEV_PMOPS,
	},
};

static int __init dw_i2c_init_driver(void)
{
	return platform_driver_register(&dw_i2c_driver);
}
subsys_initcall(dw_i2c_init_driver);

static void __exit dw_i2c_exit_driver(void)
{
	platform_driver_unregister(&dw_i2c_driver);
}
module_exit(dw_i2c_exit_driver);

MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>");
MODULE_DESCRIPTION("Synopsys DesignWare I2C bus adapter");
MODULE_LICENSE("GPL");
Commit	Line	Data
2373f6b9 DB	1	/*
	2	* Synopsys DesignWare I2C adapter driver (master only).
	3	*
	4	* Based on the TI DAVINCI I2C adapter driver.
	5	*
	6	* Copyright (C) 2006 Texas Instruments.
	7	* Copyright (C) 2007 MontaVista Software Inc.
	8	* Copyright (C) 2009 Provigent Ltd.
	9	*
	10	* ----------------------------------------------------------------------------
	11	*
	12	* This program is free software; you can redistribute it and/or modify
	13	* it under the terms of the GNU General Public License as published by
	14	* the Free Software Foundation; either version 2 of the License, or
	15	* (at your option) any later version.
	16	*
	17	* This program is distributed in the hope that it will be useful,
	18	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	20	* GNU General Public License for more details.
2373f6b9 DB	21	* ----------------------------------------------------------------------------
	22	*
	23	*/
	24	#include <linux/kernel.h>
	25	#include <linux/module.h>
	26	#include <linux/delay.h>
	27	#include <linux/i2c.h>
	28	#include <linux/clk.h>
a445900c	29	#include <linux/clk-provider.h>
2373f6b9 DB	30	#include <linux/errno.h>
	31	#include <linux/sched.h>
	32	#include <linux/err.h>
	33	#include <linux/interrupt.h>
9803f868	34	#include <linux/of.h>
2373f6b9	35	#include <linux/platform_device.h>
3bf3b289	36	#include <linux/pm.h>
7272194e	37	#include <linux/pm_runtime.h>
2373f6b9 DB	38	#include <linux/io.h>
2373f6b9 DB	39	#include <linux/slab.h>
b61b1415	40	#include <linux/acpi.h>
4bcfda09	41	#include <linux/platform_data/i2c-designware.h>
2373f6b9 DB	42	#include "i2c-designware-core.h"
	43
	44	static struct i2c_algorithm i2c_dw_algo = {
	45	.master_xfer = i2c_dw_xfer,
	46	.functionality = i2c_dw_func,
	47	};
1d31b58f DB	48	static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev)
	49	{
	50	return clk_get_rate(dev->clk)/1000;
	51	}
2373f6b9	52
b61b1415	53	#ifdef CONFIG_ACPI
57cd1e30 MW	54	static void dw_i2c_acpi_params(struct platform_device *pdev, char method[],
	55	u16 hcnt, u16 lcnt, u32 *sda_hold)
	56	{
	57	struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER };
	58	acpi_handle handle = ACPI_HANDLE(&pdev->dev);
	59	union acpi_object *obj;
	60
	61	if (ACPI_FAILURE(acpi_evaluate_object(handle, method, NULL, &buf)))
	62	return;
	63
	64	obj = (union acpi_object *)buf.pointer;
	65	if (obj->type == ACPI_TYPE_PACKAGE && obj->package.count == 3) {
	66	const union acpi_object *objs = obj->package.elements;
	67
	68	*hcnt = (u16)objs[0].integer.value;
	69	*lcnt = (u16)objs[1].integer.value;
	70	if (sda_hold)
	71	*sda_hold = (u32)objs[2].integer.value;
	72	}
	73
	74	kfree(buf.pointer);
	75	}
	76
b61b1415 MW	77	static int dw_i2c_acpi_configure(struct platform_device *pdev)
	78	{
	79	struct dw_i2c_dev *dev = platform_get_drvdata(pdev);
a445900c	80	const struct acpi_device_id *id;
b61b1415	81
b61b1415	82	dev->adapter.nr = -1;
b61b1415 MW	83	dev->tx_fifo_depth = 32;
b61b1415 MW	84	dev->rx_fifo_depth = 32;
57cd1e30 MW	85
	86	/*
	87	* Try to get SDA hold time and *CNT values from an ACPI method if
	88	* it exists for both supported speed modes.
	89	*/
0b26c845	90	dw_i2c_acpi_params(pdev, "SSCN", &dev->ss_hcnt, &dev->ss_lcnt, NULL);
57cd1e30	91	dw_i2c_acpi_params(pdev, "FMCN", &dev->fs_hcnt, &dev->fs_lcnt,
0b26c845	92	&dev->sda_hold_time);
57cd1e30	93
a445900c CP	94	/*
	95	* Provide a way for Designware I2C host controllers that are not
	96	* based on Intel LPSS to specify their input clock frequency via
	97	* id->driver_data.
	98	*/
	99	id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev);
	100	if (id && id->driver_data)
	101	clk_register_fixed_rate(&pdev->dev, dev_name(&pdev->dev), NULL,
	102	CLK_IS_ROOT, id->driver_data);
	103
b61b1415 MW	104	return 0;
	105	}
	106
a445900c CP	107	static void dw_i2c_acpi_unconfigure(struct platform_device *pdev)
	108	{
	109	struct dw_i2c_dev *dev = platform_get_drvdata(pdev);
	110	const struct acpi_device_id *id;
	111
	112	id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev);
	113	if (id && id->driver_data)
	114	clk_unregister(dev->clk);
	115	}
	116
b61b1415 MW	117	static const struct acpi_device_id dw_i2c_acpi_match[] = {
	118	{ "INT33C2", 0 },
	119	{ "INT33C3", 0 },
25b3dfc8 MW	120	{ "INT3432", 0 },
25b3dfc8 MW	121	{ "INT3433", 0 },
5a7e6bd8	122	{ "80860F41", 0 },
0409516a	123	{ "808622C1", 0 },
a445900c	124	{ "AMD0010", 133 * 1000 * 1000 },
b61b1415 MW	125	{ }
	126	};
	127	MODULE_DEVICE_TABLE(acpi, dw_i2c_acpi_match);
	128	#else
	129	static inline int dw_i2c_acpi_configure(struct platform_device *pdev)
	130	{
	131	return -ENODEV;
	132	}
a445900c	133	static inline void dw_i2c_acpi_unconfigure(struct platform_device *pdev) { }
b61b1415 MW	134	#endif
b61b1415 MW	135
0b255e92	136	static int dw_i2c_probe(struct platform_device *pdev)
2373f6b9 DB	137	{
	138	struct dw_i2c_dev *dev;
	139	struct i2c_adapter *adap;
1cb715ca	140	struct resource *mem;
4bcfda09	141	struct dw_i2c_platform_data *pdata;
2373f6b9	142	int irq, r;
925ddb24	143	u32 clk_freq, ht = 0;
2373f6b9	144
2373f6b9	145	irq = platform_get_irq(pdev, 0);
b20d3864 AB	146	if (irq < 0)
b20d3864 AB	147	return irq;
2373f6b9	148
1cb715ca AS	149	dev = devm_kzalloc(&pdev->dev, sizeof(struct dw_i2c_dev), GFP_KERNEL);
	150	if (!dev)
	151	return -ENOMEM;
2373f6b9	152
3cc2d009	153	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1cb715ca AS	154	dev->base = devm_ioremap_resource(&pdev->dev, mem);
	155	if (IS_ERR(dev->base))
	156	return PTR_ERR(dev->base);
2373f6b9 DB	157
	158	init_completion(&dev->cmd_complete);
	159	mutex_init(&dev->lock);
1cb715ca	160	dev->dev = &pdev->dev;
2373f6b9 DB	161	dev->irq = irq;
	162	platform_set_drvdata(pdev, dev);
	163
8e5f6b2a RB	164	/* fast mode by default because of legacy reasons */
	165	clk_freq = 400000;
	166
ca5b74d2	167	if (has_acpi_companion(&pdev->dev)) {
925ddb24 MW	168	dw_i2c_acpi_configure(pdev);
925ddb24 MW	169	} else if (pdev->dev.of_node) {
9803f868 CR	170	of_property_read_u32(pdev->dev.of_node,
9803f868 CR	171	"i2c-sda-hold-time-ns", &ht);
6468276b RB	172
	173	of_property_read_u32(pdev->dev.of_node,
	174	"i2c-sda-falling-time-ns",
	175	&dev->sda_falling_time);
	176	of_property_read_u32(pdev->dev.of_node,
	177	"i2c-scl-falling-time-ns",
	178	&dev->scl_falling_time);
8e5f6b2a RB	179
	180	of_property_read_u32(pdev->dev.of_node, "clock-frequency",
	181	&clk_freq);
	182
	183	/* Only standard mode at 100kHz and fast mode at 400kHz
	184	* are supported.
	185	*/
	186	if (clk_freq != 100000 && clk_freq != 400000) {
	187	dev_err(&pdev->dev, "Only 100kHz and 400kHz supported");
	188	return -EINVAL;
	189	}
4bcfda09 TR	190	} else {
	191	pdata = dev_get_platdata(&pdev->dev);
	192	if (pdata)
	193	clk_freq = pdata->i2c_scl_freq;
9803f868 CR	194	}
9803f868 CR	195
894acb2f DB	196	r = i2c_dw_eval_lock_support(dev);
	197	if (r)
	198	return r;
	199
2fa8326b DB	200	dev->functionality =
	201	I2C_FUNC_I2C \|
	202	I2C_FUNC_10BIT_ADDR \|
	203	I2C_FUNC_SMBUS_BYTE \|
	204	I2C_FUNC_SMBUS_BYTE_DATA \|
	205	I2C_FUNC_SMBUS_WORD_DATA \|
	206	I2C_FUNC_SMBUS_I2C_BLOCK;
8e5f6b2a RB	207	if (clk_freq == 100000)
	208	dev->master_cfg = DW_IC_CON_MASTER \| DW_IC_CON_SLAVE_DISABLE \|
	209	DW_IC_CON_RESTART_EN \| DW_IC_CON_SPEED_STD;
	210	else
	211	dev->master_cfg = DW_IC_CON_MASTER \| DW_IC_CON_SLAVE_DISABLE \|
	212	DW_IC_CON_RESTART_EN \| DW_IC_CON_SPEED_FAST;
2fa8326b	213
925ddb24 MW	214	dev->clk = devm_clk_get(&pdev->dev, NULL);
	215	dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz;
	216	if (IS_ERR(dev->clk))
	217	return PTR_ERR(dev->clk);
	218	clk_prepare_enable(dev->clk);
	219
	220	if (!dev->sda_hold_time && ht) {
	221	u32 ic_clk = dev->get_clk_rate_khz(dev);
	222
	223	dev->sda_hold_time = div_u64((u64)ic_clk * ht + 500000,
	224	1000000);
	225	}
	226
	227	if (!dev->tx_fifo_depth) {
f3fa9f3d	228	u32 param1 = i2c_dw_read_comp_param(dev);
2373f6b9 DB	229
	230	dev->tx_fifo_depth = ((param1 >> 16) & 0xff) + 1;
	231	dev->rx_fifo_depth = ((param1 >> 8) & 0xff) + 1;
b61b1415	232	dev->adapter.nr = pdev->id;
2373f6b9 DB	233	}
	234	r = i2c_dw_init(dev);
	235	if (r)
1cb715ca	236	return r;
2373f6b9	237
f3fa9f3d	238	i2c_dw_disable_int(dev);
1cb715ca AS	239	r = devm_request_irq(&pdev->dev, dev->irq, i2c_dw_isr, IRQF_SHARED,
1cb715ca AS	240	pdev->name, dev);
2373f6b9 DB	241	if (r) {
2373f6b9 DB	242	dev_err(&pdev->dev, "failure requesting irq %i\n", dev->irq);
1cb715ca	243	return r;
2373f6b9 DB	244	}
	245
	246	adap = &dev->adapter;
	247	i2c_set_adapdata(adap, dev);
	248	adap->owner = THIS_MODULE;
70fba830	249	adap->class = I2C_CLASS_DEPRECATED;
2373f6b9 DB	250	strlcpy(adap->name, "Synopsys DesignWare I2C adapter",
	251	sizeof(adap->name));
	252	adap->algo = &i2c_dw_algo;
	253	adap->dev.parent = &pdev->dev;
af71100c	254	adap->dev.of_node = pdev->dev.of_node;
2373f6b9	255
894acb2f DB	256	if (dev->pm_runtime_disabled) {
	257	pm_runtime_forbid(&pdev->dev);
	258	} else {
	259	pm_runtime_set_autosuspend_delay(&pdev->dev, 1000);
	260	pm_runtime_use_autosuspend(&pdev->dev);
	261	pm_runtime_set_active(&pdev->dev);
	262	pm_runtime_enable(&pdev->dev);
	263	}
7272194e	264
36d48fb5 WS	265	r = i2c_add_numbered_adapter(adap);
	266	if (r) {
	267	dev_err(&pdev->dev, "failure adding adapter\n");
	268	pm_runtime_disable(&pdev->dev);
	269	return r;
	270	}
	271
2373f6b9	272	return 0;
2373f6b9 DB	273	}
2373f6b9 DB	274
0b255e92	275	static int dw_i2c_remove(struct platform_device *pdev)
2373f6b9 DB	276	{
2373f6b9 DB	277	struct dw_i2c_dev *dev = platform_get_drvdata(pdev);
2373f6b9	278
7272194e MW	279	pm_runtime_get_sync(&pdev->dev);
7272194e MW	280
2373f6b9	281	i2c_del_adapter(&dev->adapter);
2373f6b9	282
f3fa9f3d	283	i2c_dw_disable(dev);
2373f6b9	284
edfc3901 MW	285	pm_runtime_dont_use_autosuspend(&pdev->dev);
edfc3901 MW	286	pm_runtime_put_sync(&pdev->dev);
7272194e MW	287	pm_runtime_disable(&pdev->dev);
7272194e MW	288
ca5b74d2	289	if (has_acpi_companion(&pdev->dev))
a445900c CP	290	dw_i2c_acpi_unconfigure(pdev);
a445900c CP	291
2373f6b9 DB	292	return 0;
	293	}
	294
af71100c RH	295	#ifdef CONFIG_OF
	296	static const struct of_device_id dw_i2c_of_match[] = {
	297	{ .compatible = "snps,designware-i2c", },
	298	{},
	299	};
	300	MODULE_DEVICE_TABLE(of, dw_i2c_of_match);
	301	#endif
	302
8503ff16 JZ	303	#ifdef CONFIG_PM_SLEEP
	304	static int dw_i2c_prepare(struct device *dev)
	305	{
	306	return pm_runtime_suspended(dev);
	307	}
	308
	309	static void dw_i2c_complete(struct device *dev)
	310	{
	311	if (dev->power.direct_complete)
	312	pm_request_resume(dev);
	313	}
	314	#else
	315	#define dw_i2c_prepare NULL
	316	#define dw_i2c_complete NULL
	317	#endif
	318
1fc2fe20	319	#ifdef CONFIG_PM
3bf3b289 DS	320	static int dw_i2c_suspend(struct device *dev)
	321	{
	322	struct platform_device *pdev = to_platform_device(dev);
	323	struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev);
	324
f537295a	325	i2c_dw_disable(i_dev);
e1fac69f	326	clk_disable_unprepare(i_dev->clk);
3bf3b289 DS	327
	328	return 0;
	329	}
	330
	331	static int dw_i2c_resume(struct device *dev)
	332	{
	333	struct platform_device *pdev = to_platform_device(dev);
	334	struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev);
	335
e1fac69f	336	clk_prepare_enable(i_dev->clk);
894acb2f DB	337
	338	if (!i_dev->pm_runtime_disabled)
	339	i2c_dw_init(i_dev);
3bf3b289 DS	340
	341	return 0;
	342	}
3bf3b289	343
8503ff16 JZ	344	static const struct dev_pm_ops dw_i2c_dev_pm_ops = {
	345	.prepare = dw_i2c_prepare,
	346	.complete = dw_i2c_complete,
	347	SET_SYSTEM_SLEEP_PM_OPS(dw_i2c_suspend, dw_i2c_resume)
	348	SET_RUNTIME_PM_OPS(dw_i2c_suspend, dw_i2c_resume, NULL)
	349	};
	350
	351	#define DW_I2C_DEV_PMOPS (&dw_i2c_dev_pm_ops)
	352	#else
	353	#define DW_I2C_DEV_PMOPS NULL
	354	#endif
1fc2fe20	355
2373f6b9 DB	356	/* work with hotplug and coldplug */
	357	MODULE_ALIAS("platform:i2c_designware");
	358
	359	static struct platform_driver dw_i2c_driver = {
cccdcea1 WS	360	.probe = dw_i2c_probe,
cccdcea1 WS	361	.remove = dw_i2c_remove,
2373f6b9 DB	362	.driver = {
2373f6b9 DB	363	.name = "i2c_designware",
af71100c	364	.of_match_table = of_match_ptr(dw_i2c_of_match),
b61b1415	365	.acpi_match_table = ACPI_PTR(dw_i2c_acpi_match),
8503ff16	366	.pm = DW_I2C_DEV_PMOPS,
2373f6b9 DB	367	},
	368	};
	369
	370	static int __init dw_i2c_init_driver(void)
	371	{
cccdcea1	372	return platform_driver_register(&dw_i2c_driver);
2373f6b9	373	}
10452280	374	subsys_initcall(dw_i2c_init_driver);
2373f6b9 DB	375
	376	static void __exit dw_i2c_exit_driver(void)
	377	{
	378	platform_driver_unregister(&dw_i2c_driver);
	379	}
	380	module_exit(dw_i2c_exit_driver);
	381
	382	MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>");
	383	MODULE_DESCRIPTION("Synopsys DesignWare I2C bus adapter");
	384	MODULE_LICENSE("GPL");