1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2011 Samsung Electronics
4 * Lukasz Majewski <l.majewski@samsung.com>
5 *
6 * (C) Copyright 2010
7 * Stefano Babic, DENX Software Engineering, sbabic@denx.de
8 *
9 * (C) Copyright 2008-2009 Freescale Semiconductor, Inc.
10 */
11
12 #include <common.h>
13 #include <linux/types.h>
14 #include <power/pmic.h>
15 #include <i2c.h>
16 #include <linux/compiler.h>
17
pmic_reg_write(struct pmic * p,u32 reg,u32 val)18 int pmic_reg_write(struct pmic *p, u32 reg, u32 val)
19 {
20 unsigned char buf[4] = { 0 };
21
22 if (check_reg(p, reg))
23 return -EINVAL;
24
25 I2C_SET_BUS(p->bus);
26
27 switch (pmic_i2c_tx_num) {
28 case 3:
29 if (p->sensor_byte_order == PMIC_SENSOR_BYTE_ORDER_BIG) {
30 buf[2] = (cpu_to_le32(val) >> 16) & 0xff;
31 buf[1] = (cpu_to_le32(val) >> 8) & 0xff;
32 buf[0] = cpu_to_le32(val) & 0xff;
33 } else {
34 buf[0] = (cpu_to_le32(val) >> 16) & 0xff;
35 buf[1] = (cpu_to_le32(val) >> 8) & 0xff;
36 buf[2] = cpu_to_le32(val) & 0xff;
37 }
38 break;
39 case 2:
40 if (p->sensor_byte_order == PMIC_SENSOR_BYTE_ORDER_BIG) {
41 buf[1] = (cpu_to_le32(val) >> 8) & 0xff;
42 buf[0] = cpu_to_le32(val) & 0xff;
43 } else {
44 buf[0] = (cpu_to_le32(val) >> 8) & 0xff;
45 buf[1] = cpu_to_le32(val) & 0xff;
46 }
47 break;
48 case 1:
49 buf[0] = cpu_to_le32(val) & 0xff;
50 break;
51 default:
52 printf("%s: invalid tx_num: %d", __func__, pmic_i2c_tx_num);
53 return -EINVAL;
54 }
55
56 return i2c_write(pmic_i2c_addr, reg, 1, buf, pmic_i2c_tx_num);
57 }
58
pmic_reg_read(struct pmic * p,u32 reg,u32 * val)59 int pmic_reg_read(struct pmic *p, u32 reg, u32 *val)
60 {
61 unsigned char buf[4] = { 0 };
62 u32 ret_val = 0;
63 int ret;
64
65 if (check_reg(p, reg))
66 return -EINVAL;
67
68 I2C_SET_BUS(p->bus);
69
70 ret = i2c_read(pmic_i2c_addr, reg, 1, buf, pmic_i2c_tx_num);
71 if (ret)
72 return ret;
73
74 switch (pmic_i2c_tx_num) {
75 case 3:
76 if (p->sensor_byte_order == PMIC_SENSOR_BYTE_ORDER_BIG)
77 ret_val = le32_to_cpu(buf[2] << 16
78 | buf[1] << 8 | buf[0]);
79 else
80 ret_val = le32_to_cpu(buf[0] << 16 |
81 buf[1] << 8 | buf[2]);
82 break;
83 case 2:
84 if (p->sensor_byte_order == PMIC_SENSOR_BYTE_ORDER_BIG)
85 ret_val = le32_to_cpu(buf[1] << 8 | buf[0]);
86 else
87 ret_val = le32_to_cpu(buf[0] << 8 | buf[1]);
88 break;
89 case 1:
90 ret_val = le32_to_cpu(buf[0]);
91 break;
92 default:
93 printf("%s: invalid tx_num: %d", __func__, pmic_i2c_tx_num);
94 return -EINVAL;
95 }
96 memcpy(val, &ret_val, sizeof(ret_val));
97
98 return 0;
99 }
100
pmic_probe(struct pmic * p)101 int pmic_probe(struct pmic *p)
102 {
103 i2c_set_bus_num(p->bus);
104 debug("Bus: %d PMIC:%s probed!\n", p->bus, p->name);
105 if (i2c_probe(pmic_i2c_addr)) {
106 printf("Can't find PMIC:%s\n", p->name);
107 return -ENODEV;
108 }
109
110 return 0;
111 }
112