[deliverable/linux.git] / drivers / i2c / busses / i2c-versatile.c

/*
 *  i2c-versatile.c
 *
 *  Copyright (C) 2006 ARM Ltd.
 *  written by Russell King, Deep Blue Solutions Ltd.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/i2c-algo-bit.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/io.h>

#define I2C_CONTROL	0x00
#define I2C_CONTROLS	0x00
#define I2C_CONTROLC	0x04
#define SCL		(1 << 0)
#define SDA		(1 << 1)

struct i2c_versatile {
	struct i2c_adapter	 adap;
	struct i2c_algo_bit_data algo;
	void __iomem		 *base;
};

static void i2c_versatile_setsda(void *data, int state)
{
	struct i2c_versatile *i2c = data;

	writel(SDA, i2c->base + (state ? I2C_CONTROLS : I2C_CONTROLC));
}

static void i2c_versatile_setscl(void *data, int state)
{
	struct i2c_versatile *i2c = data;

	writel(SCL, i2c->base + (state ? I2C_CONTROLS : I2C_CONTROLC));
}

static int i2c_versatile_getsda(void *data)
{
	struct i2c_versatile *i2c = data;
	return !!(readl(i2c->base + I2C_CONTROL) & SDA);
}

static int i2c_versatile_getscl(void *data)
{
	struct i2c_versatile *i2c = data;
	return !!(readl(i2c->base + I2C_CONTROL) & SCL);
}

static struct i2c_algo_bit_data i2c_versatile_algo = {
	.setsda	= i2c_versatile_setsda,
	.setscl = i2c_versatile_setscl,
	.getsda	= i2c_versatile_getsda,
	.getscl = i2c_versatile_getscl,
	.udelay	= 30,
	.timeout = HZ,
};

static int i2c_versatile_probe(struct platform_device *dev)
{
	struct i2c_versatile *i2c;
	struct resource *r;
	int ret;

	i2c = devm_kzalloc(&dev->dev, sizeof(struct i2c_versatile), GFP_KERNEL);
	if (!i2c)
		return -ENOMEM;

	r = platform_get_resource(dev, IORESOURCE_MEM, 0);
	i2c->base = devm_ioremap_resource(&dev->dev, r);
	if (IS_ERR(i2c->base))
		return PTR_ERR(i2c->base);

	writel(SCL | SDA, i2c->base + I2C_CONTROLS);

	i2c->adap.owner = THIS_MODULE;
	strlcpy(i2c->adap.name, "Versatile I2C adapter", sizeof(i2c->adap.name));
	i2c->adap.algo_data = &i2c->algo;
	i2c->adap.dev.parent = &dev->dev;
	i2c->adap.dev.of_node = dev->dev.of_node;
	i2c->algo = i2c_versatile_algo;
	i2c->algo.data = i2c;

	i2c->adap.nr = dev->id;
	ret = i2c_bit_add_numbered_bus(&i2c->adap);
	if (ret < 0)
		return ret;

	platform_set_drvdata(dev, i2c);

	return 0;
}

static int i2c_versatile_remove(struct platform_device *dev)
{
	struct i2c_versatile *i2c = platform_get_drvdata(dev);

	i2c_del_adapter(&i2c->adap);
	return 0;
}

static const struct of_device_id i2c_versatile_match[] = {
	{ .compatible = "arm,versatile-i2c", },
	{},
};
MODULE_DEVICE_TABLE(of, i2c_versatile_match);

static struct platform_driver i2c_versatile_driver = {
	.probe		= i2c_versatile_probe,
	.remove		= i2c_versatile_remove,
	.driver		= {
		.name	= "versatile-i2c",
		.of_match_table = i2c_versatile_match,
	},
};

static int __init i2c_versatile_init(void)
{
	return platform_driver_register(&i2c_versatile_driver);
}

static void __exit i2c_versatile_exit(void)
{
	platform_driver_unregister(&i2c_versatile_driver);
}

subsys_initcall(i2c_versatile_init);
module_exit(i2c_versatile_exit);

MODULE_DESCRIPTION("ARM Versatile I2C bus driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:versatile-i2c");
Commit	Line	Data
6b65cd74 RK	1	/*
	2	* i2c-versatile.c
	3	*
	4	* Copyright (C) 2006 ARM Ltd.
	5	* written by Russell King, Deep Blue Solutions Ltd.
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*/
	11	#include <linux/kernel.h>
	12	#include <linux/module.h>
	13	#include <linux/i2c.h>
	14	#include <linux/i2c-algo-bit.h>
	15	#include <linux/init.h>
	16	#include <linux/platform_device.h>
5a0e3ad6	17	#include <linux/slab.h>
21782180	18	#include <linux/io.h>
6b65cd74 RK	19
	20	#define I2C_CONTROL 0x00
	21	#define I2C_CONTROLS 0x00
	22	#define I2C_CONTROLC 0x04
	23	#define SCL (1 << 0)
	24	#define SDA (1 << 1)
	25
	26	struct i2c_versatile {
	27	struct i2c_adapter adap;
	28	struct i2c_algo_bit_data algo;
	29	void __iomem *base;
	30	};
	31
	32	static void i2c_versatile_setsda(void *data, int state)
	33	{
	34	struct i2c_versatile *i2c = data;
	35
	36	writel(SDA, i2c->base + (state ? I2C_CONTROLS : I2C_CONTROLC));
	37	}
	38
	39	static void i2c_versatile_setscl(void *data, int state)
	40	{
	41	struct i2c_versatile *i2c = data;
	42
	43	writel(SCL, i2c->base + (state ? I2C_CONTROLS : I2C_CONTROLC));
	44	}
	45
	46	static int i2c_versatile_getsda(void *data)
	47	{
	48	struct i2c_versatile *i2c = data;
	49	return !!(readl(i2c->base + I2C_CONTROL) & SDA);
	50	}
	51
	52	static int i2c_versatile_getscl(void *data)
	53	{
	54	struct i2c_versatile *i2c = data;
	55	return !!(readl(i2c->base + I2C_CONTROL) & SCL);
	56	}
	57
	58	static struct i2c_algo_bit_data i2c_versatile_algo = {
	59	.setsda = i2c_versatile_setsda,
	60	.setscl = i2c_versatile_setscl,
	61	.getsda = i2c_versatile_getsda,
	62	.getscl = i2c_versatile_getscl,
	63	.udelay = 30,
	64	.timeout = HZ,
	65	};
	66
	67	static int i2c_versatile_probe(struct platform_device *dev)
	68	{
	69	struct i2c_versatile *i2c;
	70	struct resource *r;
	71	int ret;
	72
cc461881 AL	73	i2c = devm_kzalloc(&dev->dev, sizeof(struct i2c_versatile), GFP_KERNEL);
	74	if (!i2c)
	75	return -ENOMEM;
	76
6b65cd74	77	r = platform_get_resource(dev, IORESOURCE_MEM, 0);
cc461881 AL	78	i2c->base = devm_ioremap_resource(&dev->dev, r);
	79	if (IS_ERR(i2c->base))
	80	return PTR_ERR(i2c->base);
6b65cd74 RK	81
	82	writel(SCL \| SDA, i2c->base + I2C_CONTROLS);
	83
	84	i2c->adap.owner = THIS_MODULE;
	85	strlcpy(i2c->adap.name, "Versatile I2C adapter", sizeof(i2c->adap.name));
	86	i2c->adap.algo_data = &i2c->algo;
	87	i2c->adap.dev.parent = &dev->dev;
237ab406	88	i2c->adap.dev.of_node = dev->dev.of_node;
6b65cd74 RK	89	i2c->algo = i2c_versatile_algo;
	90	i2c->algo.data = i2c;
	91
44454baa KL	92	i2c->adap.nr = dev->id;
44454baa KL	93	ret = i2c_bit_add_numbered_bus(&i2c->adap);
cc461881 AL	94	if (ret < 0)
	95	return ret;
	96
	97	platform_set_drvdata(dev, i2c);
	98
	99	return 0;
6b65cd74 RK	100	}
	101
	102	static int i2c_versatile_remove(struct platform_device *dev)
	103	{
	104	struct i2c_versatile *i2c = platform_get_drvdata(dev);
	105
6b65cd74 RK	106	i2c_del_adapter(&i2c->adap);
	107	return 0;
	108	}
	109
237ab406 PM	110	static const struct of_device_id i2c_versatile_match[] = {
	111	{ .compatible = "arm,versatile-i2c", },
	112	{},
	113	};
	114	MODULE_DEVICE_TABLE(of, i2c_versatile_match);
	115
6b65cd74 RK	116	static struct platform_driver i2c_versatile_driver = {
	117	.probe = i2c_versatile_probe,
	118	.remove = i2c_versatile_remove,
	119	.driver = {
	120	.name = "versatile-i2c",
237ab406	121	.of_match_table = i2c_versatile_match,
6b65cd74 RK	122	},
	123	};
	124
	125	static int __init i2c_versatile_init(void)
	126	{
	127	return platform_driver_register(&i2c_versatile_driver);
	128	}
	129
	130	static void __exit i2c_versatile_exit(void)
	131	{
	132	platform_driver_unregister(&i2c_versatile_driver);
	133	}
	134
2514cca0	135	subsys_initcall(i2c_versatile_init);
6b65cd74 RK	136	module_exit(i2c_versatile_exit);
	137
	138	MODULE_DESCRIPTION("ARM Versatile I2C bus driver");
	139	MODULE_LICENSE("GPL");
add8eda7	140	MODULE_ALIAS("platform:versatile-i2c");