Contributors: 9
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Linus Torvalds (pre-git) |
165 |
54.10% |
4 |
23.53% |
| Linus Torvalds |
74 |
24.26% |
1 |
5.88% |
| Russell King |
44 |
14.43% |
6 |
35.29% |
| Arnd Bergmann |
15 |
4.92% |
1 |
5.88% |
| Thomas Gleixner |
2 |
0.66% |
1 |
5.88% |
| Jean Delvare |
2 |
0.66% |
1 |
5.88% |
| Paul Gortmaker |
1 |
0.33% |
1 |
5.88% |
| Al Viro |
1 |
0.33% |
1 |
5.88% |
| Greg Kroah-Hartman |
1 |
0.33% |
1 |
5.88% |
| Total |
305 |
|
17 |
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* ARM IOC/IOMD i2c driver.
*
* Copyright (C) 2000 Russell King
*
* On Acorn machines, the following i2c devices are on the bus:
* - PCF8583 real time clock & static RAM
*/
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/i2c-algo-bit.h>
#include <linux/io.h>
#include <mach/hardware.h>
#include <asm/hardware/ioc.h>
#define FORCE_ONES 0xdc
#define SCL 0x02
#define SDA 0x01
/*
* We must preserve all non-i2c output bits in IOC_CONTROL.
* Note also that we need to preserve the value of SCL and
* SDA outputs as well (which may be different from the
* values read back from IOC_CONTROL).
*/
static u_int force_ones;
static void ioc_setscl(void *data, int state)
{
u_int ioc_control = ioc_readb(IOC_CONTROL) & ~(SCL | SDA);
u_int ones = force_ones;
if (state)
ones |= SCL;
else
ones &= ~SCL;
force_ones = ones;
ioc_writeb(ioc_control | ones, IOC_CONTROL);
}
static void ioc_setsda(void *data, int state)
{
u_int ioc_control = ioc_readb(IOC_CONTROL) & ~(SCL | SDA);
u_int ones = force_ones;
if (state)
ones |= SDA;
else
ones &= ~SDA;
force_ones = ones;
ioc_writeb(ioc_control | ones, IOC_CONTROL);
}
static int ioc_getscl(void *data)
{
return (ioc_readb(IOC_CONTROL) & SCL) != 0;
}
static int ioc_getsda(void *data)
{
return (ioc_readb(IOC_CONTROL) & SDA) != 0;
}
static struct i2c_algo_bit_data ioc_data = {
.setsda = ioc_setsda,
.setscl = ioc_setscl,
.getsda = ioc_getsda,
.getscl = ioc_getscl,
.udelay = 80,
.timeout = HZ,
};
static struct i2c_adapter ioc_ops = {
.nr = 0,
.name = "ioc",
.algo_data = &ioc_data,
};
static int __init i2c_ioc_init(void)
{
force_ones = FORCE_ONES | SCL | SDA;
return i2c_bit_add_numbered_bus(&ioc_ops);
}
module_init(i2c_ioc_init);
MODULE_AUTHOR("Russell King <linux@armlinux.org.uk>");
MODULE_DESCRIPTION("ARM IOC/IOMD i2c driver");
MODULE_LICENSE("GPL v2");