Contributors: 10
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Russell King |
501 |
81.86% |
1 |
10.00% |
| Pawel Moll |
42 |
6.86% |
1 |
10.00% |
| Axel Lin |
35 |
5.72% |
1 |
10.00% |
| Catalin Marinas |
21 |
3.43% |
1 |
10.00% |
| Kay Sievers |
5 |
0.82% |
1 |
10.00% |
| Tejun Heo |
3 |
0.49% |
1 |
10.00% |
| Thomas Gleixner |
2 |
0.33% |
1 |
10.00% |
| Linus Walleij |
1 |
0.16% |
1 |
10.00% |
| H Hartley Sweeten |
1 |
0.16% |
1 |
10.00% |
| Bhumika Goyal |
1 |
0.16% |
1 |
10.00% |
| Total |
612 |
|
10 |
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* i2c-versatile.c
*
* Copyright (C) 2006 ARM Ltd.
* written by Russell King, Deep Blue Solutions Ltd.
*/
#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 const 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");