[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/dmi.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
/*
 * The HCNT/LCNT information coming from ACPI should be the most accurate
 * for given platform. However, some systems get it wrong. On such systems
 * we get better results by calculating those based on the input clock.
 */
static const struct dmi_system_id dw_i2c_no_acpi_params[] = {
	{
		.ident = "Dell Inspiron 7348",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7348"),
		},
	},
	{ }
};

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 (dmi_check_system(dw_i2c_no_acpi_params))
		return;

	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);

	id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev);
	if (id && id->driver_data)
		dev->accessor_flags |= (u32)id->driver_data;

	return 0;
}

static const struct acpi_device_id dw_i2c_acpi_match[] = {
	{ "INT33C2", 0 },
	{ "INT33C3", 0 },
	{ "INT3432", 0 },
	{ "INT3433", 0 },
	{ "80860F41", 0 },
	{ "808622C1", 0 },
	{ "AMD0010", ACCESS_INTR_MASK },
	{ }
};
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_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;
	ACPI_COMPANION_SET(&adap->dev, ACPI_COMPANION(&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_dw_probe(dev);
	if (r && !dev->pm_runtime_disabled)
		pm_runtime_disable(&pdev->dev);

	return r;
}

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);
	if (!dev->pm_runtime_disabled)
		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_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>
56d4b8a2	27	#include <linux/dmi.h>
2373f6b9 DB	28	#include <linux/i2c.h>
2373f6b9 DB	29	#include <linux/clk.h>
a445900c	30	#include <linux/clk-provider.h>
2373f6b9 DB	31	#include <linux/errno.h>
	32	#include <linux/sched.h>
	33	#include <linux/err.h>
	34	#include <linux/interrupt.h>
9803f868	35	#include <linux/of.h>
2373f6b9	36	#include <linux/platform_device.h>
3bf3b289	37	#include <linux/pm.h>
7272194e	38	#include <linux/pm_runtime.h>
2373f6b9 DB	39	#include <linux/io.h>
2373f6b9 DB	40	#include <linux/slab.h>
b61b1415	41	#include <linux/acpi.h>
4bcfda09	42	#include <linux/platform_data/i2c-designware.h>
2373f6b9 DB	43	#include "i2c-designware-core.h"
2373f6b9 DB	44
1d31b58f DB	45	static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev)
	46	{
	47	return clk_get_rate(dev->clk)/1000;
	48	}
2373f6b9	49
b61b1415	50	#ifdef CONFIG_ACPI
56d4b8a2 MW	51	/*
	52	* The HCNT/LCNT information coming from ACPI should be the most accurate
	53	* for given platform. However, some systems get it wrong. On such systems
	54	* we get better results by calculating those based on the input clock.
	55	*/
	56	static const struct dmi_system_id dw_i2c_no_acpi_params[] = {
	57	{
	58	.ident = "Dell Inspiron 7348",
	59	.matches = {
	60	DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
	61	DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7348"),
	62	},
	63	},
	64	{ }
	65	};
	66
57cd1e30 MW	67	static void dw_i2c_acpi_params(struct platform_device *pdev, char method[],
	68	u16 hcnt, u16 lcnt, u32 *sda_hold)
	69	{
	70	struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER };
	71	acpi_handle handle = ACPI_HANDLE(&pdev->dev);
	72	union acpi_object *obj;
	73
56d4b8a2 MW	74	if (dmi_check_system(dw_i2c_no_acpi_params))
	75	return;
	76
57cd1e30 MW	77	if (ACPI_FAILURE(acpi_evaluate_object(handle, method, NULL, &buf)))
	78	return;
	79
	80	obj = (union acpi_object *)buf.pointer;
	81	if (obj->type == ACPI_TYPE_PACKAGE && obj->package.count == 3) {
	82	const union acpi_object *objs = obj->package.elements;
	83
	84	*hcnt = (u16)objs[0].integer.value;
	85	*lcnt = (u16)objs[1].integer.value;
	86	if (sda_hold)
	87	*sda_hold = (u32)objs[2].integer.value;
	88	}
	89
	90	kfree(buf.pointer);
	91	}
	92
b61b1415 MW	93	static int dw_i2c_acpi_configure(struct platform_device *pdev)
	94	{
	95	struct dw_i2c_dev *dev = platform_get_drvdata(pdev);
2d244c81	96	const struct acpi_device_id *id;
b61b1415	97
b61b1415	98	dev->adapter.nr = -1;
b61b1415 MW	99	dev->tx_fifo_depth = 32;
b61b1415 MW	100	dev->rx_fifo_depth = 32;
57cd1e30 MW	101
	102	/*
	103	* Try to get SDA hold time and *CNT values from an ACPI method if
	104	* it exists for both supported speed modes.
	105	*/
0b26c845	106	dw_i2c_acpi_params(pdev, "SSCN", &dev->ss_hcnt, &dev->ss_lcnt, NULL);
57cd1e30	107	dw_i2c_acpi_params(pdev, "FMCN", &dev->fs_hcnt, &dev->fs_lcnt,
0b26c845	108	&dev->sda_hold_time);
57cd1e30	109
2d244c81 XY	110	id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev);
	111	if (id && id->driver_data)
	112	dev->accessor_flags \|= (u32)id->driver_data;
	113
b61b1415 MW	114	return 0;
	115	}
	116
	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 },
2d244c81	124	{ "AMD0010", ACCESS_INTR_MASK },
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	}
	133	#endif
	134
6ad6fde3	135	static int dw_i2c_plat_probe(struct platform_device *pdev)
2373f6b9 DB	136	{
	137	struct dw_i2c_dev *dev;
	138	struct i2c_adapter *adap;
1cb715ca	139	struct resource *mem;
4bcfda09	140	struct dw_i2c_platform_data *pdata;
2373f6b9	141	int irq, r;
925ddb24	142	u32 clk_freq, ht = 0;
2373f6b9	143
2373f6b9	144	irq = platform_get_irq(pdev, 0);
b20d3864 AB	145	if (irq < 0)
b20d3864 AB	146	return irq;
2373f6b9	147
1cb715ca AS	148	dev = devm_kzalloc(&pdev->dev, sizeof(struct dw_i2c_dev), GFP_KERNEL);
	149	if (!dev)
	150	return -ENOMEM;
2373f6b9	151
3cc2d009	152	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1cb715ca AS	153	dev->base = devm_ioremap_resource(&pdev->dev, mem);
	154	if (IS_ERR(dev->base))
	155	return PTR_ERR(dev->base);
2373f6b9	156
1cb715ca	157	dev->dev = &pdev->dev;
2373f6b9 DB	158	dev->irq = irq;
	159	platform_set_drvdata(pdev, dev);
	160
8e5f6b2a RB	161	/* fast mode by default because of legacy reasons */
	162	clk_freq = 400000;
	163
ca5b74d2	164	if (has_acpi_companion(&pdev->dev)) {
925ddb24 MW	165	dw_i2c_acpi_configure(pdev);
925ddb24 MW	166	} else if (pdev->dev.of_node) {
9803f868 CR	167	of_property_read_u32(pdev->dev.of_node,
9803f868 CR	168	"i2c-sda-hold-time-ns", &ht);
6468276b RB	169
	170	of_property_read_u32(pdev->dev.of_node,
	171	"i2c-sda-falling-time-ns",
	172	&dev->sda_falling_time);
	173	of_property_read_u32(pdev->dev.of_node,
	174	"i2c-scl-falling-time-ns",
	175	&dev->scl_falling_time);
8e5f6b2a RB	176
	177	of_property_read_u32(pdev->dev.of_node, "clock-frequency",
	178	&clk_freq);
	179
	180	/* Only standard mode at 100kHz and fast mode at 400kHz
	181	* are supported.
	182	*/
	183	if (clk_freq != 100000 && clk_freq != 400000) {
	184	dev_err(&pdev->dev, "Only 100kHz and 400kHz supported");
	185	return -EINVAL;
	186	}
4bcfda09 TR	187	} else {
	188	pdata = dev_get_platdata(&pdev->dev);
	189	if (pdata)
	190	clk_freq = pdata->i2c_scl_freq;
9803f868 CR	191	}
9803f868 CR	192
894acb2f DB	193	r = i2c_dw_eval_lock_support(dev);
	194	if (r)
	195	return r;
	196
2fa8326b DB	197	dev->functionality =
	198	I2C_FUNC_I2C \|
	199	I2C_FUNC_10BIT_ADDR \|
	200	I2C_FUNC_SMBUS_BYTE \|
	201	I2C_FUNC_SMBUS_BYTE_DATA \|
	202	I2C_FUNC_SMBUS_WORD_DATA \|
	203	I2C_FUNC_SMBUS_I2C_BLOCK;
8e5f6b2a RB	204	if (clk_freq == 100000)
	205	dev->master_cfg = DW_IC_CON_MASTER \| DW_IC_CON_SLAVE_DISABLE \|
	206	DW_IC_CON_RESTART_EN \| DW_IC_CON_SPEED_STD;
	207	else
	208	dev->master_cfg = DW_IC_CON_MASTER \| DW_IC_CON_SLAVE_DISABLE \|
	209	DW_IC_CON_RESTART_EN \| DW_IC_CON_SPEED_FAST;
2fa8326b	210
925ddb24 MW	211	dev->clk = devm_clk_get(&pdev->dev, NULL);
	212	dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz;
	213	if (IS_ERR(dev->clk))
	214	return PTR_ERR(dev->clk);
	215	clk_prepare_enable(dev->clk);
	216
	217	if (!dev->sda_hold_time && ht) {
	218	u32 ic_clk = dev->get_clk_rate_khz(dev);
	219
	220	dev->sda_hold_time = div_u64((u64)ic_clk * ht + 500000,
	221	1000000);
	222	}
	223
	224	if (!dev->tx_fifo_depth) {
f3fa9f3d	225	u32 param1 = i2c_dw_read_comp_param(dev);
2373f6b9 DB	226
	227	dev->tx_fifo_depth = ((param1 >> 16) & 0xff) + 1;
	228	dev->rx_fifo_depth = ((param1 >> 8) & 0xff) + 1;
b61b1415	229	dev->adapter.nr = pdev->id;
2373f6b9	230	}
2373f6b9 DB	231
2373f6b9 DB	232	adap = &dev->adapter;
2373f6b9	233	adap->owner = THIS_MODULE;
70fba830	234	adap->class = I2C_CLASS_DEPRECATED;
8eb5c87a	235	ACPI_COMPANION_SET(&adap->dev, ACPI_COMPANION(&pdev->dev));
af71100c	236	adap->dev.of_node = pdev->dev.of_node;
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
d55fc378	247	r = i2c_dw_probe(dev);
e79e72c5	248	if (r && !dev->pm_runtime_disabled)
36d48fb5	249	pm_runtime_disable(&pdev->dev);
36d48fb5	250
e79e72c5	251	return r;
2373f6b9 DB	252	}
2373f6b9 DB	253
6ad6fde3	254	static int dw_i2c_plat_remove(struct platform_device *pdev)
2373f6b9 DB	255	{
2373f6b9 DB	256	struct dw_i2c_dev *dev = platform_get_drvdata(pdev);
2373f6b9	257
7272194e MW	258	pm_runtime_get_sync(&pdev->dev);
7272194e MW	259
2373f6b9	260	i2c_del_adapter(&dev->adapter);
2373f6b9	261
f3fa9f3d	262	i2c_dw_disable(dev);
2373f6b9	263
edfc3901 MW	264	pm_runtime_dont_use_autosuspend(&pdev->dev);
edfc3901 MW	265	pm_runtime_put_sync(&pdev->dev);
e79e72c5 JN	266	if (!dev->pm_runtime_disabled)
e79e72c5 JN	267	pm_runtime_disable(&pdev->dev);
7272194e	268
2373f6b9 DB	269	return 0;
	270	}
	271
af71100c RH	272	#ifdef CONFIG_OF
	273	static const struct of_device_id dw_i2c_of_match[] = {
	274	{ .compatible = "snps,designware-i2c", },
	275	{},
	276	};
	277	MODULE_DEVICE_TABLE(of, dw_i2c_of_match);
	278	#endif
	279
8503ff16	280	#ifdef CONFIG_PM_SLEEP
6ad6fde3	281	static int dw_i2c_plat_prepare(struct device *dev)
8503ff16 JZ	282	{
	283	return pm_runtime_suspended(dev);
	284	}
	285
6ad6fde3	286	static void dw_i2c_plat_complete(struct device *dev)
8503ff16 JZ	287	{
	288	if (dev->power.direct_complete)
	289	pm_request_resume(dev);
	290	}
	291	#else
319d7f05 JN	292	#define dw_i2c_plat_prepare NULL
319d7f05 JN	293	#define dw_i2c_plat_complete NULL
8503ff16 JZ	294	#endif
8503ff16 JZ	295
1fc2fe20	296	#ifdef CONFIG_PM
6ad6fde3	297	static int dw_i2c_plat_suspend(struct device *dev)
3bf3b289 DS	298	{
	299	struct platform_device *pdev = to_platform_device(dev);
	300	struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev);
	301
f537295a	302	i2c_dw_disable(i_dev);
e1fac69f	303	clk_disable_unprepare(i_dev->clk);
3bf3b289 DS	304
	305	return 0;
	306	}
	307
6ad6fde3	308	static int dw_i2c_plat_resume(struct device *dev)
3bf3b289 DS	309	{
	310	struct platform_device *pdev = to_platform_device(dev);
	311	struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev);
	312
e1fac69f	313	clk_prepare_enable(i_dev->clk);
894acb2f DB	314
	315	if (!i_dev->pm_runtime_disabled)
	316	i2c_dw_init(i_dev);
3bf3b289 DS	317
	318	return 0;
	319	}
3bf3b289	320
8503ff16	321	static const struct dev_pm_ops dw_i2c_dev_pm_ops = {
6ad6fde3 JN	322	.prepare = dw_i2c_plat_prepare,
	323	.complete = dw_i2c_plat_complete,
	324	SET_SYSTEM_SLEEP_PM_OPS(dw_i2c_plat_suspend, dw_i2c_plat_resume)
	325	SET_RUNTIME_PM_OPS(dw_i2c_plat_suspend, dw_i2c_plat_resume, NULL)
8503ff16 JZ	326	};
	327
	328	#define DW_I2C_DEV_PMOPS (&dw_i2c_dev_pm_ops)
	329	#else
	330	#define DW_I2C_DEV_PMOPS NULL
	331	#endif
1fc2fe20	332
2373f6b9 DB	333	/* work with hotplug and coldplug */
	334	MODULE_ALIAS("platform:i2c_designware");
	335
	336	static struct platform_driver dw_i2c_driver = {
6ad6fde3 JN	337	.probe = dw_i2c_plat_probe,
6ad6fde3 JN	338	.remove = dw_i2c_plat_remove,
2373f6b9 DB	339	.driver = {
2373f6b9 DB	340	.name = "i2c_designware",
af71100c	341	.of_match_table = of_match_ptr(dw_i2c_of_match),
b61b1415	342	.acpi_match_table = ACPI_PTR(dw_i2c_acpi_match),
8503ff16	343	.pm = DW_I2C_DEV_PMOPS,
2373f6b9 DB	344	},
	345	};
	346
	347	static int __init dw_i2c_init_driver(void)
	348	{
cccdcea1	349	return platform_driver_register(&dw_i2c_driver);
2373f6b9	350	}
10452280	351	subsys_initcall(dw_i2c_init_driver);
2373f6b9 DB	352
	353	static void __exit dw_i2c_exit_driver(void)
	354	{
	355	platform_driver_unregister(&dw_i2c_driver);
	356	}
	357	module_exit(dw_i2c_exit_driver);
	358
	359	MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>");
	360	MODULE_DESCRIPTION("Synopsys DesignWare I2C bus adapter");
	361	MODULE_LICENSE("GPL");