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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.
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <common.h>
#include <linux/types.h>
#include <pmic.h>
#include <spi.h>
static struct spi_slave *slave;
void pmic_spi_free(struct spi_slave *slave)
{
if (slave)
spi_free_slave(slave);
}
struct spi_slave *pmic_spi_probe(struct pmic *p)
{
return spi_setup_slave(p->bus,
p->hw.spi.cs,
p->hw.spi.clk,
p->hw.spi.mode);
}
static u32 pmic_reg(struct pmic *p, u32 reg, u32 *val, u32 write)
{
u32 pmic_tx, pmic_rx;
u32 tmp;
if (!slave) {
slave = pmic_spi_probe(p);
if (!slave)
return -1;
}
if (check_reg(reg))
return -1;
if (spi_claim_bus(slave))
return -1;
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)) {
spi_release_bus(slave);
return -1;
}
if (write) {
pmic_tx = p->hw.spi.prepare_tx(0, NULL, write);
pmic_tx &= ~(1 << 31);
tmp = cpu_to_be32(pmic_tx);
if (spi_xfer(slave, pmic_spi_bitlen, &tmp, &pmic_rx,
pmic_spi_flags)) {
spi_release_bus(slave);
return -1;
}
}
spi_release_bus(slave);
*val = cpu_to_be32(pmic_rx);
return 0;
}
int pmic_reg_write(struct pmic *p, u32 reg, u32 val)
{
if (pmic_reg(p, reg, &val, 1))
return -1;
return 0;
}
int pmic_reg_read(struct pmic *p, u32 reg, u32 *val)
{
if (pmic_reg(p, reg, val, 0))
return -1;
return 0;
}
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