1 /* 2 * Copyright (C) 2011 Samsung Electronics 3 * Lukasz Majewski <l.majewski@samsung.com> 4 * 5 * (C) Copyright 2010 6 * Stefano Babic, DENX Software Engineering, sbabic@denx.de 7 * 8 * (C) Copyright 2008-2009 Freescale Semiconductor, Inc. 9 * 10 * SPDX-License-Identifier: GPL-2.0+ 11 */ 12 13 #include <common.h> 14 #include <linux/types.h> 15 #include <power/pmic.h> 16 #include <spi.h> 17 18 static struct spi_slave *slave; 19 20 static u32 pmic_reg(struct pmic *p, u32 reg, u32 *val, u32 write) 21 { 22 u32 pmic_tx, pmic_rx; 23 u32 tmp; 24 25 if (!slave) { 26 slave = spi_setup_slave(p->bus, p->hw.spi.cs, p->hw.spi.clk, 27 p->hw.spi.mode); 28 29 if (!slave) 30 return -1; 31 } 32 33 if (check_reg(p, reg)) 34 return -1; 35 36 if (spi_claim_bus(slave)) 37 return -1; 38 39 pmic_tx = p->hw.spi.prepare_tx(reg, val, write); 40 41 tmp = cpu_to_be32(pmic_tx); 42 43 if (spi_xfer(slave, pmic_spi_bitlen, &tmp, &pmic_rx, 44 pmic_spi_flags)) 45 goto err; 46 47 if (write) { 48 pmic_tx = p->hw.spi.prepare_tx(reg, val, 0); 49 tmp = cpu_to_be32(pmic_tx); 50 if (spi_xfer(slave, pmic_spi_bitlen, &tmp, &pmic_rx, 51 pmic_spi_flags)) 52 goto err; 53 } 54 55 spi_release_bus(slave); 56 *val = cpu_to_be32(pmic_rx); 57 58 return 0; 59 60 err: 61 spi_release_bus(slave); 62 return -1; 63 } 64 65 int pmic_reg_write(struct pmic *p, u32 reg, u32 val) 66 { 67 if (pmic_reg(p, reg, &val, 1)) 68 return -1; 69 70 return 0; 71 } 72 73 int pmic_reg_read(struct pmic *p, u32 reg, u32 *val) 74 { 75 if (pmic_reg(p, reg, val, 0)) 76 return -1; 77 78 return 0; 79 } 80