power_i2c.c
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/*
* Copyright (C) 2011 Samsung Electronics
* Lukasz Majewski <l.majewski@samsung.com>
*
* (C) Copyright 2010
* Stefano Babic, DENX Software Engineering, sbabic@denx.de
*
* (C) Copyright 2008-2009 Freescale Semiconductor, Inc.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <linux/types.h>
#include <power/pmic.h>
#include <i2c.h>
#include <linux/compiler.h>
int pmic_reg_write(struct pmic *p, u32 reg, u32 val)
{
unsigned char buf[4] = { 0 };
if (check_reg(p, reg))
return -EINVAL;
I2C_SET_BUS(p->bus);
switch (pmic_i2c_tx_num) {
case 3:
if (p->sensor_byte_order == PMIC_SENSOR_BYTE_ORDER_BIG) {
buf[2] = (cpu_to_le32(val) >> 16) & 0xff;
buf[1] = (cpu_to_le32(val) >> 8) & 0xff;
buf[0] = cpu_to_le32(val) & 0xff;
} else {
buf[0] = (cpu_to_le32(val) >> 16) & 0xff;
buf[1] = (cpu_to_le32(val) >> 8) & 0xff;
buf[2] = cpu_to_le32(val) & 0xff;
}
break;
case 2:
if (p->sensor_byte_order == PMIC_SENSOR_BYTE_ORDER_BIG) {
buf[1] = (cpu_to_le32(val) >> 8) & 0xff;
buf[0] = cpu_to_le32(val) & 0xff;
} else {
buf[0] = (cpu_to_le32(val) >> 8) & 0xff;
buf[1] = cpu_to_le32(val) & 0xff;
}
break;
case 1:
buf[0] = cpu_to_le32(val) & 0xff;
break;
default:
printf("%s: invalid tx_num: %d", __func__, pmic_i2c_tx_num);
return -EINVAL;
}
return i2c_write(pmic_i2c_addr, reg, 1, buf, pmic_i2c_tx_num);
}
int pmic_reg_read(struct pmic *p, u32 reg, u32 *val)
{
unsigned char buf[4] = { 0 };
u32 ret_val = 0;
int ret;
if (check_reg(p, reg))
return -EINVAL;
I2C_SET_BUS(p->bus);
ret = i2c_read(pmic_i2c_addr, reg, 1, buf, pmic_i2c_tx_num);
if (ret)
return ret;
switch (pmic_i2c_tx_num) {
case 3:
if (p->sensor_byte_order == PMIC_SENSOR_BYTE_ORDER_BIG)
ret_val = le32_to_cpu(buf[2] << 16
| buf[1] << 8 | buf[0]);
else
ret_val = le32_to_cpu(buf[0] << 16 |
buf[1] << 8 | buf[2]);
break;
case 2:
if (p->sensor_byte_order == PMIC_SENSOR_BYTE_ORDER_BIG)
ret_val = le32_to_cpu(buf[1] << 8 | buf[0]);
else
ret_val = le32_to_cpu(buf[0] << 8 | buf[1]);
break;
case 1:
ret_val = le32_to_cpu(buf[0]);
break;
default:
printf("%s: invalid tx_num: %d", __func__, pmic_i2c_tx_num);
return -EINVAL;
}
memcpy(val, &ret_val, sizeof(ret_val));
return 0;
}
int pmic_probe(struct pmic *p)
{
i2c_set_bus_num(p->bus);
debug("Bus: %d PMIC:%s probed!\n", p->bus, p->name);
if (i2c_probe(pmic_i2c_addr)) {
printf("Can't find PMIC:%s\n", p->name);
return -ENODEV;
}
return 0;
}