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 <i2c.h> 17 #include <compiler.h> 18 19 int pmic_reg_write(struct pmic *p, u32 reg, u32 val) 20 { 21 unsigned char buf[4] = { 0 }; 22 23 if (check_reg(p, reg)) 24 return -1; 25 26 switch (pmic_i2c_tx_num) { 27 case 3: 28 if (p->sensor_byte_order == PMIC_SENSOR_BYTE_ORDER_BIG) { 29 buf[2] = (cpu_to_le32(val) >> 16) & 0xff; 30 buf[1] = (cpu_to_le32(val) >> 8) & 0xff; 31 buf[0] = cpu_to_le32(val) & 0xff; 32 } else { 33 buf[0] = (cpu_to_le32(val) >> 16) & 0xff; 34 buf[1] = (cpu_to_le32(val) >> 8) & 0xff; 35 buf[2] = cpu_to_le32(val) & 0xff; 36 } 37 break; 38 case 2: 39 if (p->sensor_byte_order == PMIC_SENSOR_BYTE_ORDER_BIG) { 40 buf[1] = (cpu_to_le32(val) >> 8) & 0xff; 41 buf[0] = cpu_to_le32(val) & 0xff; 42 } else { 43 buf[0] = (cpu_to_le32(val) >> 8) & 0xff; 44 buf[1] = cpu_to_le32(val) & 0xff; 45 } 46 break; 47 case 1: 48 buf[0] = cpu_to_le32(val) & 0xff; 49 break; 50 default: 51 printf("%s: invalid tx_num: %d", __func__, pmic_i2c_tx_num); 52 return -1; 53 } 54 55 if (i2c_write(pmic_i2c_addr, reg, 1, buf, pmic_i2c_tx_num)) 56 return -1; 57 58 return 0; 59 } 60 61 int pmic_reg_read(struct pmic *p, u32 reg, u32 *val) 62 { 63 unsigned char buf[4] = { 0 }; 64 u32 ret_val = 0; 65 66 if (check_reg(p, reg)) 67 return -1; 68 69 if (i2c_read(pmic_i2c_addr, reg, 1, buf, pmic_i2c_tx_num)) 70 return -1; 71 72 switch (pmic_i2c_tx_num) { 73 case 3: 74 if (p->sensor_byte_order == PMIC_SENSOR_BYTE_ORDER_BIG) 75 ret_val = le32_to_cpu(buf[2] << 16 76 | buf[1] << 8 | buf[0]); 77 else 78 ret_val = le32_to_cpu(buf[0] << 16 | 79 buf[1] << 8 | buf[2]); 80 break; 81 case 2: 82 if (p->sensor_byte_order == PMIC_SENSOR_BYTE_ORDER_BIG) 83 ret_val = le32_to_cpu(buf[1] << 8 | buf[0]); 84 else 85 ret_val = le32_to_cpu(buf[0] << 8 | buf[1]); 86 break; 87 case 1: 88 ret_val = le32_to_cpu(buf[0]); 89 break; 90 default: 91 printf("%s: invalid tx_num: %d", __func__, pmic_i2c_tx_num); 92 return -1; 93 } 94 memcpy(val, &ret_val, sizeof(ret_val)); 95 96 return 0; 97 } 98 99 int pmic_probe(struct pmic *p) 100 { 101 i2c_set_bus_num(p->bus); 102 debug("Bus: %d PMIC:%s probed!\n", p->bus, p->name); 103 if (i2c_probe(pmic_i2c_addr)) { 104 printf("Can't find PMIC:%s\n", p->name); 105 return -1; 106 } 107 108 return 0; 109 } 110