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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);
| }
|
|
