power_spi.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 <spi.h>
static struct spi_slave *slave;
static u32 pmic_reg(struct pmic *p, u32 reg, u32 *val, u32 write)
{
u32 pmic_tx, pmic_rx;
u32 tmp;
if (!slave) {
slave = spi_setup_slave(p->bus, p->hw.spi.cs, p->hw.spi.clk,
p->hw.spi.mode);
if (!slave)
return -ENODEV;
}
if (check_reg(p, reg))
return -EINVAL;
if (spi_claim_bus(slave))
return -EBUSY;
pmic_tx = p->hw.spi.prepare_tx(reg, val, write);
tmp = cpu_to_be32(pmic_tx);
if (spi_xfer(slave, pmic_spi_bitlen, &tmp, &pmic_rx,
pmic_spi_flags))
goto err;
if (write) {
pmic_tx = p->hw.spi.prepare_tx(reg, val, 0);
tmp = cpu_to_be32(pmic_tx);
if (spi_xfer(slave, pmic_spi_bitlen, &tmp, &pmic_rx,
pmic_spi_flags))
goto err;
}
spi_release_bus(slave);
*val = cpu_to_be32(pmic_rx);
return 0;
err:
spi_release_bus(slave);
return -ENOTSUPP;
}
int pmic_reg_write(struct pmic *p, u32 reg, u32 val)
{
return pmic_reg(p, reg, &val, 1);
}
int pmic_reg_read(struct pmic *p, u32 reg, u32 *val)
{
return pmic_reg(p, reg, val, 0);
}