1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (c) 2014 Google, Inc
4 */
5
6 #include <common.h>
7 #include <dm.h>
8 #include <errno.h>
9 #include <i2c.h>
10
11 static int cur_busnum __attribute__((section(".data")));
12
i2c_compat_get_device(uint chip_addr,int alen,struct udevice ** devp)13 static int i2c_compat_get_device(uint chip_addr, int alen,
14 struct udevice **devp)
15 {
16 struct dm_i2c_chip *chip;
17 int ret;
18
19 ret = i2c_get_chip_for_busnum(cur_busnum, chip_addr, alen, devp);
20 if (ret)
21 return ret;
22 chip = dev_get_parent_platdata(*devp);
23 if (chip->offset_len != alen) {
24 printf("I2C chip %x: requested alen %d does not match chip offset_len %d\n",
25 chip_addr, alen, chip->offset_len);
26 return -EADDRNOTAVAIL;
27 }
28
29 return 0;
30 }
31
i2c_probe(uint8_t chip_addr)32 int i2c_probe(uint8_t chip_addr)
33 {
34 struct udevice *bus, *dev;
35 int ret;
36
37 ret = uclass_get_device_by_seq(UCLASS_I2C, cur_busnum, &bus);
38 if (ret) {
39 debug("Cannot find I2C bus %d: err=%d\n", cur_busnum, ret);
40 return ret;
41 }
42
43 if (!bus)
44 return -ENOENT;
45
46 return dm_i2c_probe(bus, chip_addr, 0, &dev);
47 }
48
i2c_read(uint8_t chip_addr,unsigned int addr,int alen,uint8_t * buffer,int len)49 int i2c_read(uint8_t chip_addr, unsigned int addr, int alen, uint8_t *buffer,
50 int len)
51 {
52 struct udevice *dev;
53 int ret;
54
55 ret = i2c_compat_get_device(chip_addr, alen, &dev);
56 if (ret)
57 return ret;
58
59 return dm_i2c_read(dev, addr, buffer, len);
60 }
61
i2c_write(uint8_t chip_addr,unsigned int addr,int alen,uint8_t * buffer,int len)62 int i2c_write(uint8_t chip_addr, unsigned int addr, int alen, uint8_t *buffer,
63 int len)
64 {
65 struct udevice *dev;
66 int ret;
67
68 ret = i2c_compat_get_device(chip_addr, alen, &dev);
69 if (ret)
70 return ret;
71
72 return dm_i2c_write(dev, addr, buffer, len);
73 }
74
i2c_get_bus_num_fdt(int node)75 int i2c_get_bus_num_fdt(int node)
76 {
77 struct udevice *bus;
78 int ret;
79
80 ret = uclass_get_device_by_of_offset(UCLASS_I2C, node, &bus);
81 if (ret)
82 return ret;
83
84 return bus->seq;
85 }
86
i2c_get_bus_num(void)87 unsigned int i2c_get_bus_num(void)
88 {
89 return cur_busnum;
90 }
91
i2c_set_bus_num(unsigned int bus)92 int i2c_set_bus_num(unsigned int bus)
93 {
94 cur_busnum = bus;
95
96 return 0;
97 }
98
i2c_init(int speed,int slaveaddr)99 void i2c_init(int speed, int slaveaddr)
100 {
101 /* Nothing to do here - the init happens through driver model */
102 }
103
board_i2c_init(const void * blob)104 void board_i2c_init(const void *blob)
105 {
106 /* Nothing to do here - the init happens through driver model */
107 }
108
i2c_reg_read(uint8_t chip_addr,uint8_t offset)109 uint8_t i2c_reg_read(uint8_t chip_addr, uint8_t offset)
110 {
111 struct udevice *dev;
112 int ret;
113
114 ret = i2c_compat_get_device(chip_addr, 1, &dev);
115 if (ret)
116 return 0xff;
117 return dm_i2c_reg_read(dev, offset);
118 }
119
i2c_reg_write(uint8_t chip_addr,uint8_t offset,uint8_t val)120 void i2c_reg_write(uint8_t chip_addr, uint8_t offset, uint8_t val)
121 {
122 struct udevice *dev;
123 int ret;
124
125 ret = i2c_compat_get_device(chip_addr, 1, &dev);
126 if (!ret)
127 dm_i2c_reg_write(dev, offset, val);
128 }
129