mirror of https://gitee.com/openkylin/linux.git
136 lines
2.5 KiB
C
136 lines
2.5 KiB
C
/*
|
|
* Copyright (C) ST-Ericsson SA 2010
|
|
*
|
|
* Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
|
|
* License terms: GNU General Public License (GPL), version 2
|
|
*/
|
|
|
|
#define pr_fmt(fmt) "mop500-uib: " fmt
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/i2c.h>
|
|
|
|
#include <mach/hardware.h>
|
|
#include "board-mop500.h"
|
|
|
|
enum mop500_uib {
|
|
STUIB,
|
|
U8500UIB,
|
|
};
|
|
|
|
struct uib {
|
|
const char *name;
|
|
const char *option;
|
|
void (*init)(void);
|
|
};
|
|
|
|
static struct __initdata uib mop500_uibs[] = {
|
|
[STUIB] = {
|
|
.name = "ST-UIB",
|
|
.option = "stuib",
|
|
.init = mop500_stuib_init,
|
|
},
|
|
[U8500UIB] = {
|
|
.name = "U8500-UIB",
|
|
.option = "u8500uib",
|
|
.init = mop500_u8500uib_init,
|
|
},
|
|
};
|
|
|
|
static struct uib *mop500_uib;
|
|
|
|
static int __init mop500_uib_setup(char *str)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(mop500_uibs); i++) {
|
|
struct uib *uib = &mop500_uibs[i];
|
|
|
|
if (!strcmp(str, uib->option)) {
|
|
mop500_uib = uib;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (i == ARRAY_SIZE(mop500_uibs))
|
|
pr_err("invalid uib= option (%s)\n", str);
|
|
|
|
return 1;
|
|
}
|
|
__setup("uib=", mop500_uib_setup);
|
|
|
|
/*
|
|
* The UIBs are detected after the I2C host controllers are registered, so
|
|
* i2c_register_board_info() can't be used.
|
|
*/
|
|
void mop500_uib_i2c_add(int busnum, struct i2c_board_info *info,
|
|
unsigned n)
|
|
{
|
|
struct i2c_adapter *adap;
|
|
struct i2c_client *client;
|
|
int i;
|
|
|
|
adap = i2c_get_adapter(busnum);
|
|
if (!adap) {
|
|
pr_err("failed to get adapter i2c%d\n", busnum);
|
|
return;
|
|
}
|
|
|
|
for (i = 0; i < n; i++) {
|
|
client = i2c_new_device(adap, &info[i]);
|
|
if (!client)
|
|
pr_err("failed to register %s to i2c%d\n",
|
|
info[i].type, busnum);
|
|
}
|
|
|
|
i2c_put_adapter(adap);
|
|
}
|
|
|
|
static void __init __mop500_uib_init(struct uib *uib, const char *why)
|
|
{
|
|
pr_info("%s (%s)\n", uib->name, why);
|
|
uib->init();
|
|
}
|
|
|
|
/*
|
|
* Detect the UIB attached based on the presence or absence of i2c devices.
|
|
*/
|
|
static int __init mop500_uib_init(void)
|
|
{
|
|
struct uib *uib = mop500_uib;
|
|
struct i2c_adapter *i2c0;
|
|
int ret;
|
|
|
|
if (!cpu_is_u8500())
|
|
return -ENODEV;
|
|
|
|
if (uib) {
|
|
__mop500_uib_init(uib, "from uib= boot argument");
|
|
return 0;
|
|
}
|
|
|
|
i2c0 = i2c_get_adapter(0);
|
|
if (!i2c0) {
|
|
__mop500_uib_init(&mop500_uibs[STUIB],
|
|
"fallback, could not get i2c0");
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* U8500-UIB has the TC35893 at 0x44 on I2C0, the ST-UIB doesn't. */
|
|
ret = i2c_smbus_xfer(i2c0, 0x44, 0, I2C_SMBUS_WRITE, 0,
|
|
I2C_SMBUS_QUICK, NULL);
|
|
i2c_put_adapter(i2c0);
|
|
|
|
if (ret == 0)
|
|
uib = &mop500_uibs[U8500UIB];
|
|
else
|
|
uib = &mop500_uibs[STUIB];
|
|
|
|
__mop500_uib_init(uib, "detected");
|
|
|
|
return 0;
|
|
}
|
|
|
|
module_init(mop500_uib_init);
|