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
pmic_reg_write(struct pmic * p,u32 reg,u32 val)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
pmic_reg_read(struct pmic * p,u32 reg,u32 * val)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
pmic_probe(struct pmic * p)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