[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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 * ----------------------------------------------------------------------------
 *
 */
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/clk.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 "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);
	bool fs_mode = dev->master_cfg & DW_IC_CON_SPEED_FAST;

	if (!ACPI_HANDLE(&pdev->dev))
		return -ENODEV;

	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,
			   fs_mode ? NULL : &dev->sda_hold_time);
	dw_i2c_acpi_params(pdev, "FMCN", &dev->fs_hcnt, &dev->fs_lcnt,
			   fs_mode ? &dev->sda_hold_time : NULL);

	return 0;
}

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

static int dw_i2c_probe(struct platform_device *pdev)
{
	struct dw_i2c_dev *dev;
	struct i2c_adapter *adap;
	struct resource *mem;
	int irq, r;

	irq = platform_get_irq(pdev, 0);
	if (irq < 0) {
		dev_err(&pdev->dev, "no irq resource?\n");
		return irq; /* -ENXIO */
	}

	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);

	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 (pdev->dev.of_node) {
		u32 ht = 0;
		u32 ic_clk = dev->get_clk_rate_khz(dev);

		of_property_read_u32(pdev->dev.of_node,
					"i2c-sda-hold-time-ns", &ht);
		dev->sda_hold_time = div_u64((u64)ic_clk * ht + 500000,
					     1000000);

		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);
	}

	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;
	dev->master_cfg =  DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE |
		DW_IC_CON_RESTART_EN | DW_IC_CON_SPEED_FAST;

	/* Try first if we can configure the device from ACPI */
	r = dw_i2c_acpi_configure(pdev);
	if (r) {
		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;

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

	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);

	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_put(&pdev->dev);
	pm_runtime_disable(&pdev->dev);

	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
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);
	i2c_dw_init(i_dev);

	return 0;
}
#endif

static UNIVERSAL_DEV_PM_OPS(dw_i2c_dev_pm_ops, dw_i2c_suspend,
			    dw_i2c_resume, NULL);

/* 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",
		.owner	= THIS_MODULE,
		.of_match_table = of_match_ptr(dw_i2c_of_match),
		.acpi_match_table = ACPI_PTR(dw_i2c_acpi_match),
		.pm	= &dw_i2c_dev_pm_ops,
	},
};

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.
	21	*
	22	* You should have received a copy of the GNU General Public License
	23	* along with this program; if not, write to the Free Software
	24	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	25	* ----------------------------------------------------------------------------
	26	*
	27	*/
	28	#include <linux/kernel.h>
	29	#include <linux/module.h>
	30	#include <linux/delay.h>
	31	#include <linux/i2c.h>
	32	#include <linux/clk.h>
	33	#include <linux/errno.h>
	34	#include <linux/sched.h>
	35	#include <linux/err.h>
	36	#include <linux/interrupt.h>
9803f868	37	#include <linux/of.h>
2373f6b9	38	#include <linux/platform_device.h>
3bf3b289	39	#include <linux/pm.h>
7272194e	40	#include <linux/pm_runtime.h>
2373f6b9 DB	41	#include <linux/io.h>
2373f6b9 DB	42	#include <linux/slab.h>
b61b1415	43	#include <linux/acpi.h>
2373f6b9 DB	44	#include "i2c-designware-core.h"
	45
	46	static struct i2c_algorithm i2c_dw_algo = {
	47	.master_xfer = i2c_dw_xfer,
	48	.functionality = i2c_dw_func,
	49	};
1d31b58f DB	50	static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev)
	51	{
	52	return clk_get_rate(dev->clk)/1000;
	53	}
2373f6b9	54
b61b1415	55	#ifdef CONFIG_ACPI
57cd1e30 MW	56	static void dw_i2c_acpi_params(struct platform_device *pdev, char method[],
	57	u16 hcnt, u16 lcnt, u32 *sda_hold)
	58	{
	59	struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER };
	60	acpi_handle handle = ACPI_HANDLE(&pdev->dev);
	61	union acpi_object *obj;
	62
	63	if (ACPI_FAILURE(acpi_evaluate_object(handle, method, NULL, &buf)))
	64	return;
	65
	66	obj = (union acpi_object *)buf.pointer;
	67	if (obj->type == ACPI_TYPE_PACKAGE && obj->package.count == 3) {
	68	const union acpi_object *objs = obj->package.elements;
	69
	70	*hcnt = (u16)objs[0].integer.value;
	71	*lcnt = (u16)objs[1].integer.value;
	72	if (sda_hold)
	73	*sda_hold = (u32)objs[2].integer.value;
	74	}
	75
	76	kfree(buf.pointer);
	77	}
	78
b61b1415 MW	79	static int dw_i2c_acpi_configure(struct platform_device *pdev)
	80	{
	81	struct dw_i2c_dev *dev = platform_get_drvdata(pdev);
57cd1e30	82	bool fs_mode = dev->master_cfg & DW_IC_CON_SPEED_FAST;
b61b1415 MW	83
	84	if (!ACPI_HANDLE(&pdev->dev))
	85	return -ENODEV;
	86
b61b1415	87	dev->adapter.nr = -1;
b61b1415 MW	88	dev->tx_fifo_depth = 32;
b61b1415 MW	89	dev->rx_fifo_depth = 32;
57cd1e30 MW	90
	91	/*
	92	* Try to get SDA hold time and *CNT values from an ACPI method if
	93	* it exists for both supported speed modes.
	94	*/
	95	dw_i2c_acpi_params(pdev, "SSCN", &dev->ss_hcnt, &dev->ss_lcnt,
	96	fs_mode ? NULL : &dev->sda_hold_time);
	97	dw_i2c_acpi_params(pdev, "FMCN", &dev->fs_hcnt, &dev->fs_lcnt,
	98	fs_mode ? &dev->sda_hold_time : NULL);
	99
b61b1415 MW	100	return 0;
	101	}
	102
	103	static const struct acpi_device_id dw_i2c_acpi_match[] = {
	104	{ "INT33C2", 0 },
	105	{ "INT33C3", 0 },
25b3dfc8 MW	106	{ "INT3432", 0 },
25b3dfc8 MW	107	{ "INT3433", 0 },
5a7e6bd8	108	{ "80860F41", 0 },
b61b1415 MW	109	{ }
	110	};
	111	MODULE_DEVICE_TABLE(acpi, dw_i2c_acpi_match);
	112	#else
	113	static inline int dw_i2c_acpi_configure(struct platform_device *pdev)
	114	{
	115	return -ENODEV;
	116	}
	117	#endif
	118
0b255e92	119	static int dw_i2c_probe(struct platform_device *pdev)
2373f6b9 DB	120	{
	121	struct dw_i2c_dev *dev;
	122	struct i2c_adapter *adap;
1cb715ca	123	struct resource *mem;
2373f6b9 DB	124	int irq, r;
2373f6b9 DB	125
2373f6b9 DB	126	irq = platform_get_irq(pdev, 0);
	127	if (irq < 0) {
	128	dev_err(&pdev->dev, "no irq resource?\n");
	129	return irq; /* -ENXIO */
	130	}
	131
1cb715ca AS	132	dev = devm_kzalloc(&pdev->dev, sizeof(struct dw_i2c_dev), GFP_KERNEL);
	133	if (!dev)
	134	return -ENOMEM;
2373f6b9	135
3cc2d009	136	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1cb715ca AS	137	dev->base = devm_ioremap_resource(&pdev->dev, mem);
	138	if (IS_ERR(dev->base))
	139	return PTR_ERR(dev->base);
2373f6b9 DB	140
	141	init_completion(&dev->cmd_complete);
	142	mutex_init(&dev->lock);
1cb715ca	143	dev->dev = &pdev->dev;
2373f6b9 DB	144	dev->irq = irq;
	145	platform_set_drvdata(pdev, dev);
	146
1cb715ca	147	dev->clk = devm_clk_get(&pdev->dev, NULL);
1d31b58f DB	148	dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz;
1d31b58f DB	149
1cb715ca AS	150	if (IS_ERR(dev->clk))
1cb715ca AS	151	return PTR_ERR(dev->clk);
e1fac69f	152	clk_prepare_enable(dev->clk);
2373f6b9	153
9803f868 CR	154	if (pdev->dev.of_node) {
	155	u32 ht = 0;
	156	u32 ic_clk = dev->get_clk_rate_khz(dev);
	157
	158	of_property_read_u32(pdev->dev.of_node,
	159	"i2c-sda-hold-time-ns", &ht);
97191d73 VS	160	dev->sda_hold_time = div_u64((u64)ic_clk * ht + 500000,
97191d73 VS	161	1000000);
6468276b RB	162
	163	of_property_read_u32(pdev->dev.of_node,
	164	"i2c-sda-falling-time-ns",
	165	&dev->sda_falling_time);
	166	of_property_read_u32(pdev->dev.of_node,
	167	"i2c-scl-falling-time-ns",
	168	&dev->scl_falling_time);
9803f868 CR	169	}
9803f868 CR	170
2fa8326b DB	171	dev->functionality =
	172	I2C_FUNC_I2C \|
	173	I2C_FUNC_10BIT_ADDR \|
	174	I2C_FUNC_SMBUS_BYTE \|
	175	I2C_FUNC_SMBUS_BYTE_DATA \|
	176	I2C_FUNC_SMBUS_WORD_DATA \|
	177	I2C_FUNC_SMBUS_I2C_BLOCK;
e18563fc DB	178	dev->master_cfg = DW_IC_CON_MASTER \| DW_IC_CON_SLAVE_DISABLE \|
e18563fc DB	179	DW_IC_CON_RESTART_EN \| DW_IC_CON_SPEED_FAST;
2fa8326b	180
b61b1415 MW	181	/* Try first if we can configure the device from ACPI */
	182	r = dw_i2c_acpi_configure(pdev);
	183	if (r) {
f3fa9f3d	184	u32 param1 = i2c_dw_read_comp_param(dev);
2373f6b9 DB	185
	186	dev->tx_fifo_depth = ((param1 >> 16) & 0xff) + 1;
	187	dev->rx_fifo_depth = ((param1 >> 8) & 0xff) + 1;
b61b1415	188	dev->adapter.nr = pdev->id;
2373f6b9 DB	189	}
	190	r = i2c_dw_init(dev);
	191	if (r)
1cb715ca	192	return r;
2373f6b9	193
f3fa9f3d	194	i2c_dw_disable_int(dev);
1cb715ca AS	195	r = devm_request_irq(&pdev->dev, dev->irq, i2c_dw_isr, IRQF_SHARED,
1cb715ca AS	196	pdev->name, dev);
2373f6b9 DB	197	if (r) {
2373f6b9 DB	198	dev_err(&pdev->dev, "failure requesting irq %i\n", dev->irq);
1cb715ca	199	return r;
2373f6b9 DB	200	}
	201
	202	adap = &dev->adapter;
	203	i2c_set_adapdata(adap, dev);
	204	adap->owner = THIS_MODULE;
70fba830	205	adap->class = I2C_CLASS_DEPRECATED;
2373f6b9 DB	206	strlcpy(adap->name, "Synopsys DesignWare I2C adapter",
	207	sizeof(adap->name));
	208	adap->algo = &i2c_dw_algo;
	209	adap->dev.parent = &pdev->dev;
af71100c	210	adap->dev.of_node = pdev->dev.of_node;
2373f6b9	211
2373f6b9 DB	212	r = i2c_add_numbered_adapter(adap);
	213	if (r) {
	214	dev_err(&pdev->dev, "failure adding adapter\n");
1cb715ca	215	return r;
2373f6b9 DB	216	}
2373f6b9 DB	217
43452335 MW	218	pm_runtime_set_autosuspend_delay(&pdev->dev, 1000);
43452335 MW	219	pm_runtime_use_autosuspend(&pdev->dev);
7272194e MW	220	pm_runtime_set_active(&pdev->dev);
7272194e MW	221	pm_runtime_enable(&pdev->dev);
7272194e	222
2373f6b9	223	return 0;
2373f6b9 DB	224	}
2373f6b9 DB	225
0b255e92	226	static int dw_i2c_remove(struct platform_device *pdev)
2373f6b9 DB	227	{
2373f6b9 DB	228	struct dw_i2c_dev *dev = platform_get_drvdata(pdev);
2373f6b9	229
7272194e MW	230	pm_runtime_get_sync(&pdev->dev);
7272194e MW	231
2373f6b9	232	i2c_del_adapter(&dev->adapter);
2373f6b9	233
f3fa9f3d	234	i2c_dw_disable(dev);
2373f6b9	235
7272194e MW	236	pm_runtime_put(&pdev->dev);
	237	pm_runtime_disable(&pdev->dev);
	238
2373f6b9 DB	239	return 0;
	240	}
	241
af71100c RH	242	#ifdef CONFIG_OF
	243	static const struct of_device_id dw_i2c_of_match[] = {
	244	{ .compatible = "snps,designware-i2c", },
	245	{},
	246	};
	247	MODULE_DEVICE_TABLE(of, dw_i2c_of_match);
	248	#endif
	249
1fc2fe20	250	#ifdef CONFIG_PM
3bf3b289 DS	251	static int dw_i2c_suspend(struct device *dev)
	252	{
	253	struct platform_device *pdev = to_platform_device(dev);
	254	struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev);
	255
f537295a	256	i2c_dw_disable(i_dev);
e1fac69f	257	clk_disable_unprepare(i_dev->clk);
3bf3b289 DS	258
	259	return 0;
	260	}
	261
	262	static int dw_i2c_resume(struct device *dev)
	263	{
	264	struct platform_device *pdev = to_platform_device(dev);
	265	struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev);
	266
e1fac69f	267	clk_prepare_enable(i_dev->clk);
3bf3b289 DS	268	i2c_dw_init(i_dev);
	269
	270	return 0;
	271	}
dfb03fb2	272	#endif
3bf3b289	273
1fc2fe20 MW	274	static UNIVERSAL_DEV_PM_OPS(dw_i2c_dev_pm_ops, dw_i2c_suspend,
	275	dw_i2c_resume, NULL);
	276
2373f6b9 DB	277	/* work with hotplug and coldplug */
	278	MODULE_ALIAS("platform:i2c_designware");
	279
	280	static struct platform_driver dw_i2c_driver = {
cccdcea1 WS	281	.probe = dw_i2c_probe,
cccdcea1 WS	282	.remove = dw_i2c_remove,
2373f6b9 DB	283	.driver = {
	284	.name = "i2c_designware",
	285	.owner = THIS_MODULE,
af71100c	286	.of_match_table = of_match_ptr(dw_i2c_of_match),
b61b1415	287	.acpi_match_table = ACPI_PTR(dw_i2c_acpi_match),
1fc2fe20	288	.pm = &dw_i2c_dev_pm_ops,
2373f6b9 DB	289	},
	290	};
	291
	292	static int __init dw_i2c_init_driver(void)
	293	{
cccdcea1	294	return platform_driver_register(&dw_i2c_driver);
2373f6b9	295	}
10452280	296	subsys_initcall(dw_i2c_init_driver);
2373f6b9 DB	297
	298	static void __exit dw_i2c_exit_driver(void)
	299	{
	300	platform_driver_unregister(&dw_i2c_driver);
	301	}
	302	module_exit(dw_i2c_exit_driver);
	303
	304	MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>");
	305	MODULE_DESCRIPTION("Synopsys DesignWare I2C bus adapter");
	306	MODULE_LICENSE("GPL");