]> git.sur5r.net Git - u-boot/blob - drivers/power/power_i2c.c
Merge git://git.denx.de/u-boot-dm
[u-boot] / drivers / power / power_i2c.c
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 }