[mirror_ubuntu-artful-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 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_plat_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);

	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;
	}

	adap = &dev->adapter;
	adap->owner = THIS_MODULE;
	adap->class = I2C_CLASS_DEPRECATED;
	adap->dev.of_node = pdev->dev.of_node;

	r = i2c_dw_probe(dev);
	if (r)
		return r;

	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);
	}

	return 0;
}

static int dw_i2c_plat_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_plat_prepare(struct device *dev)
{
	return pm_runtime_suspended(dev);
}

static void dw_i2c_plat_complete(struct device *dev)
{
	if (dev->power.direct_complete)
		pm_request_resume(dev);
}
#else
#define dw_i2c_plat_prepare	NULL
#define dw_i2c_plat_complete	NULL
#endif

#ifdef CONFIG_PM
static int dw_i2c_plat_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_plat_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_plat_prepare,
	.complete = dw_i2c_plat_complete,
	SET_SYSTEM_SLEEP_PM_OPS(dw_i2c_plat_suspend, dw_i2c_plat_resume)
	SET_RUNTIME_PM_OPS(dw_i2c_plat_suspend, dw_i2c_plat_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_plat_probe,
	.remove = dw_i2c_plat_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"
2373f6b9 DB	43
1d31b58f DB	44	static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev)
	45	{
	46	return clk_get_rate(dev->clk)/1000;
	47	}
2373f6b9	48
b61b1415	49	#ifdef CONFIG_ACPI
57cd1e30 MW	50	static void dw_i2c_acpi_params(struct platform_device *pdev, char method[],
	51	u16 hcnt, u16 lcnt, u32 *sda_hold)
	52	{
	53	struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER };
	54	acpi_handle handle = ACPI_HANDLE(&pdev->dev);
	55	union acpi_object *obj;
	56
	57	if (ACPI_FAILURE(acpi_evaluate_object(handle, method, NULL, &buf)))
	58	return;
	59
	60	obj = (union acpi_object *)buf.pointer;
	61	if (obj->type == ACPI_TYPE_PACKAGE && obj->package.count == 3) {
	62	const union acpi_object *objs = obj->package.elements;
	63
	64	*hcnt = (u16)objs[0].integer.value;
	65	*lcnt = (u16)objs[1].integer.value;
	66	if (sda_hold)
	67	*sda_hold = (u32)objs[2].integer.value;
	68	}
	69
	70	kfree(buf.pointer);
	71	}
	72
b61b1415 MW	73	static int dw_i2c_acpi_configure(struct platform_device *pdev)
	74	{
	75	struct dw_i2c_dev *dev = platform_get_drvdata(pdev);
a445900c	76	const struct acpi_device_id *id;
b61b1415	77
b61b1415	78	dev->adapter.nr = -1;
b61b1415 MW	79	dev->tx_fifo_depth = 32;
b61b1415 MW	80	dev->rx_fifo_depth = 32;
57cd1e30 MW	81
	82	/*
	83	* Try to get SDA hold time and *CNT values from an ACPI method if
	84	* it exists for both supported speed modes.
	85	*/
0b26c845	86	dw_i2c_acpi_params(pdev, "SSCN", &dev->ss_hcnt, &dev->ss_lcnt, NULL);
57cd1e30	87	dw_i2c_acpi_params(pdev, "FMCN", &dev->fs_hcnt, &dev->fs_lcnt,
0b26c845	88	&dev->sda_hold_time);
57cd1e30	89
a445900c CP	90	/*
	91	* Provide a way for Designware I2C host controllers that are not
	92	* based on Intel LPSS to specify their input clock frequency via
	93	* id->driver_data.
	94	*/
	95	id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev);
	96	if (id && id->driver_data)
	97	clk_register_fixed_rate(&pdev->dev, dev_name(&pdev->dev), NULL,
	98	CLK_IS_ROOT, id->driver_data);
	99
b61b1415 MW	100	return 0;
	101	}
	102
a445900c CP	103	static void dw_i2c_acpi_unconfigure(struct platform_device *pdev)
	104	{
	105	struct dw_i2c_dev *dev = platform_get_drvdata(pdev);
	106	const struct acpi_device_id *id;
	107
	108	id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev);
	109	if (id && id->driver_data)
	110	clk_unregister(dev->clk);
	111	}
	112
b61b1415 MW	113	static const struct acpi_device_id dw_i2c_acpi_match[] = {
	114	{ "INT33C2", 0 },
	115	{ "INT33C3", 0 },
25b3dfc8 MW	116	{ "INT3432", 0 },
25b3dfc8 MW	117	{ "INT3433", 0 },
5a7e6bd8	118	{ "80860F41", 0 },
0409516a	119	{ "808622C1", 0 },
a445900c	120	{ "AMD0010", 133 * 1000 * 1000 },
b61b1415 MW	121	{ }
	122	};
	123	MODULE_DEVICE_TABLE(acpi, dw_i2c_acpi_match);
	124	#else
	125	static inline int dw_i2c_acpi_configure(struct platform_device *pdev)
	126	{
	127	return -ENODEV;
	128	}
a445900c	129	static inline void dw_i2c_acpi_unconfigure(struct platform_device *pdev) { }
b61b1415 MW	130	#endif
b61b1415 MW	131
6ad6fde3	132	static int dw_i2c_plat_probe(struct platform_device *pdev)
2373f6b9 DB	133	{
	134	struct dw_i2c_dev *dev;
	135	struct i2c_adapter *adap;
1cb715ca	136	struct resource *mem;
4bcfda09	137	struct dw_i2c_platform_data *pdata;
2373f6b9	138	int irq, r;
925ddb24	139	u32 clk_freq, ht = 0;
2373f6b9	140
2373f6b9	141	irq = platform_get_irq(pdev, 0);
b20d3864 AB	142	if (irq < 0)
b20d3864 AB	143	return irq;
2373f6b9	144
1cb715ca AS	145	dev = devm_kzalloc(&pdev->dev, sizeof(struct dw_i2c_dev), GFP_KERNEL);
	146	if (!dev)
	147	return -ENOMEM;
2373f6b9	148
3cc2d009	149	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1cb715ca AS	150	dev->base = devm_ioremap_resource(&pdev->dev, mem);
	151	if (IS_ERR(dev->base))
	152	return PTR_ERR(dev->base);
2373f6b9	153
1cb715ca	154	dev->dev = &pdev->dev;
2373f6b9 DB	155	dev->irq = irq;
	156	platform_set_drvdata(pdev, dev);
	157
8e5f6b2a RB	158	/* fast mode by default because of legacy reasons */
	159	clk_freq = 400000;
	160
ca5b74d2	161	if (has_acpi_companion(&pdev->dev)) {
925ddb24 MW	162	dw_i2c_acpi_configure(pdev);
925ddb24 MW	163	} else if (pdev->dev.of_node) {
9803f868 CR	164	of_property_read_u32(pdev->dev.of_node,
9803f868 CR	165	"i2c-sda-hold-time-ns", &ht);
6468276b RB	166
	167	of_property_read_u32(pdev->dev.of_node,
	168	"i2c-sda-falling-time-ns",
	169	&dev->sda_falling_time);
	170	of_property_read_u32(pdev->dev.of_node,
	171	"i2c-scl-falling-time-ns",
	172	&dev->scl_falling_time);
8e5f6b2a RB	173
	174	of_property_read_u32(pdev->dev.of_node, "clock-frequency",
	175	&clk_freq);
	176
	177	/* Only standard mode at 100kHz and fast mode at 400kHz
	178	* are supported.
	179	*/
	180	if (clk_freq != 100000 && clk_freq != 400000) {
	181	dev_err(&pdev->dev, "Only 100kHz and 400kHz supported");
	182	return -EINVAL;
	183	}
4bcfda09 TR	184	} else {
	185	pdata = dev_get_platdata(&pdev->dev);
	186	if (pdata)
	187	clk_freq = pdata->i2c_scl_freq;
9803f868 CR	188	}
9803f868 CR	189
894acb2f DB	190	r = i2c_dw_eval_lock_support(dev);
	191	if (r)
	192	return r;
	193
2fa8326b DB	194	dev->functionality =
	195	I2C_FUNC_I2C \|
	196	I2C_FUNC_10BIT_ADDR \|
	197	I2C_FUNC_SMBUS_BYTE \|
	198	I2C_FUNC_SMBUS_BYTE_DATA \|
	199	I2C_FUNC_SMBUS_WORD_DATA \|
	200	I2C_FUNC_SMBUS_I2C_BLOCK;
8e5f6b2a RB	201	if (clk_freq == 100000)
	202	dev->master_cfg = DW_IC_CON_MASTER \| DW_IC_CON_SLAVE_DISABLE \|
	203	DW_IC_CON_RESTART_EN \| DW_IC_CON_SPEED_STD;
	204	else
	205	dev->master_cfg = DW_IC_CON_MASTER \| DW_IC_CON_SLAVE_DISABLE \|
	206	DW_IC_CON_RESTART_EN \| DW_IC_CON_SPEED_FAST;
2fa8326b	207
925ddb24 MW	208	dev->clk = devm_clk_get(&pdev->dev, NULL);
	209	dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz;
	210	if (IS_ERR(dev->clk))
	211	return PTR_ERR(dev->clk);
	212	clk_prepare_enable(dev->clk);
	213
	214	if (!dev->sda_hold_time && ht) {
	215	u32 ic_clk = dev->get_clk_rate_khz(dev);
	216
	217	dev->sda_hold_time = div_u64((u64)ic_clk * ht + 500000,
	218	1000000);
	219	}
	220
	221	if (!dev->tx_fifo_depth) {
f3fa9f3d	222	u32 param1 = i2c_dw_read_comp_param(dev);
2373f6b9 DB	223
	224	dev->tx_fifo_depth = ((param1 >> 16) & 0xff) + 1;
	225	dev->rx_fifo_depth = ((param1 >> 8) & 0xff) + 1;
b61b1415	226	dev->adapter.nr = pdev->id;
2373f6b9	227	}
2373f6b9 DB	228
2373f6b9 DB	229	adap = &dev->adapter;
2373f6b9	230	adap->owner = THIS_MODULE;
70fba830	231	adap->class = I2C_CLASS_DEPRECATED;
af71100c	232	adap->dev.of_node = pdev->dev.of_node;
2373f6b9	233
d80d1341 JN	234	r = i2c_dw_probe(dev);
d80d1341 JN	235	if (r)
1cb715ca	236	return r;
2373f6b9	237
894acb2f DB	238	if (dev->pm_runtime_disabled) {
	239	pm_runtime_forbid(&pdev->dev);
	240	} else {
	241	pm_runtime_set_autosuspend_delay(&pdev->dev, 1000);
	242	pm_runtime_use_autosuspend(&pdev->dev);
	243	pm_runtime_set_active(&pdev->dev);
	244	pm_runtime_enable(&pdev->dev);
	245	}
7272194e	246
2373f6b9	247	return 0;
2373f6b9 DB	248	}
2373f6b9 DB	249
6ad6fde3	250	static int dw_i2c_plat_remove(struct platform_device *pdev)
2373f6b9 DB	251	{
2373f6b9 DB	252	struct dw_i2c_dev *dev = platform_get_drvdata(pdev);
2373f6b9	253
7272194e MW	254	pm_runtime_get_sync(&pdev->dev);
7272194e MW	255
2373f6b9	256	i2c_del_adapter(&dev->adapter);
2373f6b9	257
f3fa9f3d	258	i2c_dw_disable(dev);
2373f6b9	259
edfc3901 MW	260	pm_runtime_dont_use_autosuspend(&pdev->dev);
edfc3901 MW	261	pm_runtime_put_sync(&pdev->dev);
7272194e MW	262	pm_runtime_disable(&pdev->dev);
7272194e MW	263
ca5b74d2	264	if (has_acpi_companion(&pdev->dev))
a445900c CP	265	dw_i2c_acpi_unconfigure(pdev);
a445900c CP	266
2373f6b9 DB	267	return 0;
	268	}
	269
af71100c RH	270	#ifdef CONFIG_OF
	271	static const struct of_device_id dw_i2c_of_match[] = {
	272	{ .compatible = "snps,designware-i2c", },
	273	{},
	274	};
	275	MODULE_DEVICE_TABLE(of, dw_i2c_of_match);
	276	#endif
	277
8503ff16	278	#ifdef CONFIG_PM_SLEEP
6ad6fde3	279	static int dw_i2c_plat_prepare(struct device *dev)
8503ff16 JZ	280	{
	281	return pm_runtime_suspended(dev);
	282	}
	283
6ad6fde3	284	static void dw_i2c_plat_complete(struct device *dev)
8503ff16 JZ	285	{
	286	if (dev->power.direct_complete)
	287	pm_request_resume(dev);
	288	}
	289	#else
319d7f05 JN	290	#define dw_i2c_plat_prepare NULL
319d7f05 JN	291	#define dw_i2c_plat_complete NULL
8503ff16 JZ	292	#endif
8503ff16 JZ	293
1fc2fe20	294	#ifdef CONFIG_PM
6ad6fde3	295	static int dw_i2c_plat_suspend(struct device *dev)
3bf3b289 DS	296	{
	297	struct platform_device *pdev = to_platform_device(dev);
	298	struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev);
	299
f537295a	300	i2c_dw_disable(i_dev);
e1fac69f	301	clk_disable_unprepare(i_dev->clk);
3bf3b289 DS	302
	303	return 0;
	304	}
	305
6ad6fde3	306	static int dw_i2c_plat_resume(struct device *dev)
3bf3b289 DS	307	{
	308	struct platform_device *pdev = to_platform_device(dev);
	309	struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev);
	310
e1fac69f	311	clk_prepare_enable(i_dev->clk);
894acb2f DB	312
	313	if (!i_dev->pm_runtime_disabled)
	314	i2c_dw_init(i_dev);
3bf3b289 DS	315
	316	return 0;
	317	}
3bf3b289	318
8503ff16	319	static const struct dev_pm_ops dw_i2c_dev_pm_ops = {
6ad6fde3 JN	320	.prepare = dw_i2c_plat_prepare,
	321	.complete = dw_i2c_plat_complete,
	322	SET_SYSTEM_SLEEP_PM_OPS(dw_i2c_plat_suspend, dw_i2c_plat_resume)
	323	SET_RUNTIME_PM_OPS(dw_i2c_plat_suspend, dw_i2c_plat_resume, NULL)
8503ff16 JZ	324	};
	325
	326	#define DW_I2C_DEV_PMOPS (&dw_i2c_dev_pm_ops)
	327	#else
	328	#define DW_I2C_DEV_PMOPS NULL
	329	#endif
1fc2fe20	330
2373f6b9 DB	331	/* work with hotplug and coldplug */
	332	MODULE_ALIAS("platform:i2c_designware");
	333
	334	static struct platform_driver dw_i2c_driver = {
6ad6fde3 JN	335	.probe = dw_i2c_plat_probe,
6ad6fde3 JN	336	.remove = dw_i2c_plat_remove,
2373f6b9 DB	337	.driver = {
2373f6b9 DB	338	.name = "i2c_designware",
af71100c	339	.of_match_table = of_match_ptr(dw_i2c_of_match),
b61b1415	340	.acpi_match_table = ACPI_PTR(dw_i2c_acpi_match),
8503ff16	341	.pm = DW_I2C_DEV_PMOPS,
2373f6b9 DB	342	},
	343	};
	344
	345	static int __init dw_i2c_init_driver(void)
	346	{
cccdcea1	347	return platform_driver_register(&dw_i2c_driver);
2373f6b9	348	}
10452280	349	subsys_initcall(dw_i2c_init_driver);
2373f6b9 DB	350
	351	static void __exit dw_i2c_exit_driver(void)
	352	{
	353	platform_driver_unregister(&dw_i2c_driver);
	354	}
	355	module_exit(dw_i2c_exit_driver);
	356
	357	MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>");
	358	MODULE_DESCRIPTION("Synopsys DesignWare I2C bus adapter");
	359	MODULE_LICENSE("GPL");