93 lines
1.6 KiB
C
93 lines
1.6 KiB
C
/*
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* Copyright (C) 2011 Samsung Electronics
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* Lukasz Majewski <l.majewski@samsung.com>
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*
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* (C) Copyright 2010
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* Stefano Babic, DENX Software Engineering, sbabic@denx.de
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*
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* (C) Copyright 2008-2009 Freescale Semiconductor, Inc.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <linux/types.h>
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#include <power/pmic.h>
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#include <spi.h>
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static struct spi_slave *slave;
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void pmic_spi_free(struct spi_slave *slave)
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{
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if (slave)
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spi_free_slave(slave);
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}
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struct spi_slave *pmic_spi_probe(struct pmic *p)
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{
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return spi_setup_slave(p->bus,
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p->hw.spi.cs,
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p->hw.spi.clk,
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p->hw.spi.mode);
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}
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static u32 pmic_reg(struct pmic *p, u32 reg, u32 *val, u32 write)
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{
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u32 pmic_tx, pmic_rx;
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u32 tmp;
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if (!slave) {
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slave = pmic_spi_probe(p);
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if (!slave)
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return -1;
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}
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if (check_reg(p, reg))
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return -1;
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if (spi_claim_bus(slave))
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return -1;
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pmic_tx = p->hw.spi.prepare_tx(reg, val, write);
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tmp = cpu_to_be32(pmic_tx);
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if (spi_xfer(slave, pmic_spi_bitlen, &tmp, &pmic_rx,
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pmic_spi_flags)) {
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spi_release_bus(slave);
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return -1;
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}
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if (write) {
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pmic_tx = p->hw.spi.prepare_tx(reg, val, 0);
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tmp = cpu_to_be32(pmic_tx);
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if (spi_xfer(slave, pmic_spi_bitlen, &tmp, &pmic_rx,
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pmic_spi_flags)) {
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spi_release_bus(slave);
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return -1;
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}
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}
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spi_release_bus(slave);
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*val = cpu_to_be32(pmic_rx);
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return 0;
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}
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int pmic_reg_write(struct pmic *p, u32 reg, u32 val)
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{
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if (pmic_reg(p, reg, &val, 1))
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return -1;
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return 0;
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}
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int pmic_reg_read(struct pmic *p, u32 reg, u32 *val)
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{
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if (pmic_reg(p, reg, val, 0))
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return -1;
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return 0;
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}
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