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 <linux/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 -EINVAL; 25 26 I2C_SET_BUS(p->bus); 27 28 switch (pmic_i2c_tx_num) { 29 case 3: 30 if (p->sensor_byte_order == PMIC_SENSOR_BYTE_ORDER_BIG) { 31 buf[2] = (cpu_to_le32(val) >> 16) & 0xff; 32 buf[1] = (cpu_to_le32(val) >> 8) & 0xff; 33 buf[0] = cpu_to_le32(val) & 0xff; 34 } else { 35 buf[0] = (cpu_to_le32(val) >> 16) & 0xff; 36 buf[1] = (cpu_to_le32(val) >> 8) & 0xff; 37 buf[2] = cpu_to_le32(val) & 0xff; 38 } 39 break; 40 case 2: 41 if (p->sensor_byte_order == PMIC_SENSOR_BYTE_ORDER_BIG) { 42 buf[1] = (cpu_to_le32(val) >> 8) & 0xff; 43 buf[0] = cpu_to_le32(val) & 0xff; 44 } else { 45 buf[0] = (cpu_to_le32(val) >> 8) & 0xff; 46 buf[1] = cpu_to_le32(val) & 0xff; 47 } 48 break; 49 case 1: 50 buf[0] = cpu_to_le32(val) & 0xff; 51 break; 52 default: 53 printf("%s: invalid tx_num: %d", __func__, pmic_i2c_tx_num); 54 return -EINVAL; 55 } 56 57 return i2c_write(pmic_i2c_addr, reg, 1, buf, pmic_i2c_tx_num); 58 } 59 60 int pmic_reg_read(struct pmic *p, u32 reg, u32 *val) 61 { 62 unsigned char buf[4] = { 0 }; 63 u32 ret_val = 0; 64 int ret; 65 66 if (check_reg(p, reg)) 67 return -EINVAL; 68 69 I2C_SET_BUS(p->bus); 70 71 ret = i2c_read(pmic_i2c_addr, reg, 1, buf, pmic_i2c_tx_num); 72 if (ret) 73 return ret; 74 75 switch (pmic_i2c_tx_num) { 76 case 3: 77 if (p->sensor_byte_order == PMIC_SENSOR_BYTE_ORDER_BIG) 78 ret_val = le32_to_cpu(buf[2] << 16 79 | buf[1] << 8 | buf[0]); 80 else 81 ret_val = le32_to_cpu(buf[0] << 16 | 82 buf[1] << 8 | buf[2]); 83 break; 84 case 2: 85 if (p->sensor_byte_order == PMIC_SENSOR_BYTE_ORDER_BIG) 86 ret_val = le32_to_cpu(buf[1] << 8 | buf[0]); 87 else 88 ret_val = le32_to_cpu(buf[0] << 8 | buf[1]); 89 break; 90 case 1: 91 ret_val = le32_to_cpu(buf[0]); 92 break; 93 default: 94 printf("%s: invalid tx_num: %d", __func__, pmic_i2c_tx_num); 95 return -EINVAL; 96 } 97 memcpy(val, &ret_val, sizeof(ret_val)); 98 99 return 0; 100 } 101 102 int pmic_probe(struct pmic *p) 103 { 104 i2c_set_bus_num(p->bus); 105 debug("Bus: %d PMIC:%s probed!\n", p->bus, p->name); 106 if (i2c_probe(pmic_i2c_addr)) { 107 printf("Can't find PMIC:%s\n", p->name); 108 return -ENODEV; 109 } 110 111 return 0; 112 } 113