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 * (C) Copyright 2019 NXP
11 */
12
13 #include <common.h>
14 #include <log.h>
15 #include <linux/types.h>
16 #include <power/pmic.h>
17 #include <i2c.h>
18 #include <linux/compiler.h>
19
pmic_reg_write(struct pmic * p,u32 reg,u32 val)20 int pmic_reg_write(struct pmic *p, u32 reg, u32 val)
21 {
22 unsigned char buf[4] = { 0 };
23
24 if (check_reg(p, reg))
25 return -EINVAL;
26 #if CONFIG_IS_ENABLED(DM_I2C)
27 struct udevice *dev;
28 int ret;
29
30 ret = i2c_get_chip_for_busnum(p->bus, pmic_i2c_addr,
31 1, &dev);
32 if (ret) {
33 printf("%s: Cannot find udev for a bus %d\n", __func__,
34 p->bus);
35 return -ENXIO;
36 }
37 #else /* Non DM I2C support - will be removed */
38 I2C_SET_BUS(p->bus);
39 #endif
40
41 switch (pmic_i2c_tx_num) {
42 case 3:
43 if (p->sensor_byte_order == PMIC_SENSOR_BYTE_ORDER_BIG) {
44 buf[2] = (cpu_to_le32(val) >> 16) & 0xff;
45 buf[1] = (cpu_to_le32(val) >> 8) & 0xff;
46 buf[0] = cpu_to_le32(val) & 0xff;
47 } else {
48 buf[0] = (cpu_to_le32(val) >> 16) & 0xff;
49 buf[1] = (cpu_to_le32(val) >> 8) & 0xff;
50 buf[2] = cpu_to_le32(val) & 0xff;
51 }
52 break;
53 case 2:
54 if (p->sensor_byte_order == PMIC_SENSOR_BYTE_ORDER_BIG) {
55 buf[1] = (cpu_to_le32(val) >> 8) & 0xff;
56 buf[0] = cpu_to_le32(val) & 0xff;
57 } else {
58 buf[0] = (cpu_to_le32(val) >> 8) & 0xff;
59 buf[1] = cpu_to_le32(val) & 0xff;
60 }
61 break;
62 case 1:
63 buf[0] = cpu_to_le32(val) & 0xff;
64 break;
65 default:
66 printf("%s: invalid tx_num: %d", __func__, pmic_i2c_tx_num);
67 return -EINVAL;
68 }
69
70 #if CONFIG_IS_ENABLED(DM_I2C)
71 return dm_i2c_write(dev, reg, buf, pmic_i2c_tx_num);
72 #else
73 return i2c_write(pmic_i2c_addr, reg, 1, buf, pmic_i2c_tx_num);
74 #endif
75 }
76
pmic_reg_read(struct pmic * p,u32 reg,u32 * val)77 int pmic_reg_read(struct pmic *p, u32 reg, u32 *val)
78 {
79 unsigned char buf[4] = { 0 };
80 u32 ret_val = 0;
81 int ret;
82
83 if (check_reg(p, reg))
84 return -EINVAL;
85
86 #if CONFIG_IS_ENABLED(DM_I2C)
87 struct udevice *dev;
88
89 ret = i2c_get_chip_for_busnum(p->bus, pmic_i2c_addr,
90 1, &dev);
91 if (ret) {
92 printf("%s: Cannot find udev for a bus %d\n", __func__,
93 p->bus);
94 return -ENXIO;
95 }
96 ret = dm_i2c_read(dev, reg, buf, pmic_i2c_tx_num);
97 #else /* Non DM I2C support - will be removed */
98 I2C_SET_BUS(p->bus);
99 ret = i2c_read(pmic_i2c_addr, reg, 1, buf, pmic_i2c_tx_num);
100 #endif
101 if (ret)
102 return ret;
103
104 switch (pmic_i2c_tx_num) {
105 case 3:
106 if (p->sensor_byte_order == PMIC_SENSOR_BYTE_ORDER_BIG)
107 ret_val = le32_to_cpu(buf[2] << 16
108 | buf[1] << 8 | buf[0]);
109 else
110 ret_val = le32_to_cpu(buf[0] << 16 |
111 buf[1] << 8 | buf[2]);
112 break;
113 case 2:
114 if (p->sensor_byte_order == PMIC_SENSOR_BYTE_ORDER_BIG)
115 ret_val = le32_to_cpu(buf[1] << 8 | buf[0]);
116 else
117 ret_val = le32_to_cpu(buf[0] << 8 | buf[1]);
118 break;
119 case 1:
120 ret_val = le32_to_cpu(buf[0]);
121 break;
122 default:
123 printf("%s: invalid tx_num: %d", __func__, pmic_i2c_tx_num);
124 return -EINVAL;
125 }
126 memcpy(val, &ret_val, sizeof(ret_val));
127
128 return 0;
129 }
130
pmic_probe(struct pmic * p)131 int pmic_probe(struct pmic *p)
132 {
133 debug("Bus: %d PMIC:%s probed!\n", p->bus, p->name);
134 #if CONFIG_IS_ENABLED(DM_I2C)
135 struct udevice *dev;
136 int ret;
137
138 ret = i2c_get_chip_for_busnum(p->bus, pmic_i2c_addr,
139 1, &dev);
140 if (ret) {
141 printf("%s: Cannot find udev for a bus %d\n", __func__,
142 p->bus);
143 return -ENXIO;
144 }
145 #else /* Non DM I2C support - will be removed */
146 i2c_set_bus_num(p->bus);
147 if (i2c_probe(pmic_i2c_addr)) {
148 printf("Can't find PMIC:%s\n", p->name);
149 return -ENODEV;
150 }
151 #endif
152
153 return 0;
154 }
155