blob: de78db6a887f3a4bc74a0486e2ee634c98775057 [file] [log] [blame]
Simon Glass73845352015-01-12 18:02:08 -07001/*
2 * Copyright (c) 2014 Google, Inc
3 *
4 * SPDX-License-Identifier: GPL-2.0+
5 */
6
7#include <common.h>
8#include <dm.h>
9#include <errno.h>
10#include <i2c.h>
11
Vignesh R95def3c2016-07-25 16:26:45 +053012static int cur_busnum __attribute__((section(".data")));
Simon Glass73845352015-01-12 18:02:08 -070013
14static int i2c_compat_get_device(uint chip_addr, int alen,
15 struct udevice **devp)
16{
17 struct dm_i2c_chip *chip;
18 int ret;
19
Przemyslaw Marczak18a7f6a2015-01-27 13:36:28 +010020 ret = i2c_get_chip_for_busnum(cur_busnum, chip_addr, alen, devp);
Simon Glass73845352015-01-12 18:02:08 -070021 if (ret)
22 return ret;
Simon Glasse6f66ec2015-01-25 08:27:13 -070023 chip = dev_get_parent_platdata(*devp);
Simon Glass73845352015-01-12 18:02:08 -070024 if (chip->offset_len != alen) {
Simon Glassd744d562015-01-26 20:29:39 -070025 printf("I2C chip %x: requested alen %d does not match chip offset_len %d\n",
26 chip_addr, alen, chip->offset_len);
Simon Glass73845352015-01-12 18:02:08 -070027 return -EADDRNOTAVAIL;
28 }
29
30 return 0;
31}
32
33int i2c_probe(uint8_t chip_addr)
34{
35 struct udevice *bus, *dev;
36 int ret;
37
38 ret = uclass_get_device_by_seq(UCLASS_I2C, cur_busnum, &bus);
39 if (ret) {
40 debug("Cannot find I2C bus %d: err=%d\n", cur_busnum, ret);
41 return ret;
42 }
43
44 if (!bus)
45 return -ENOENT;
46
47 return dm_i2c_probe(bus, chip_addr, 0, &dev);
48}
49
50int i2c_read(uint8_t chip_addr, unsigned int addr, int alen, uint8_t *buffer,
51 int len)
52{
53 struct udevice *dev;
54 int ret;
55
56 ret = i2c_compat_get_device(chip_addr, alen, &dev);
57 if (ret)
58 return ret;
59
60 return dm_i2c_read(dev, addr, buffer, len);
61}
62
63int i2c_write(uint8_t chip_addr, unsigned int addr, int alen, uint8_t *buffer,
64 int len)
65{
66 struct udevice *dev;
67 int ret;
68
69 ret = i2c_compat_get_device(chip_addr, alen, &dev);
70 if (ret)
71 return ret;
72
73 return dm_i2c_write(dev, addr, buffer, len);
74}
75
76int i2c_get_bus_num_fdt(int node)
77{
78 struct udevice *bus;
79 int ret;
80
81 ret = uclass_get_device_by_of_offset(UCLASS_I2C, node, &bus);
82 if (ret)
83 return ret;
84
85 return bus->seq;
86}
87
88unsigned int i2c_get_bus_num(void)
89{
90 return cur_busnum;
91}
92
93int i2c_set_bus_num(unsigned int bus)
94{
95 cur_busnum = bus;
96
97 return 0;
98}
Simon Glassd744d562015-01-26 20:29:39 -070099
100void i2c_init(int speed, int slaveaddr)
101{
102 /* Nothing to do here - the init happens through driver model */
103}
104
105void board_i2c_init(const void *blob)
106{
107 /* Nothing to do here - the init happens through driver model */
108}
Simon Glassa2879762015-05-16 15:01:41 -0600109
110uint8_t i2c_reg_read(uint8_t chip_addr, uint8_t offset)
111{
112 struct udevice *dev;
113 int ret;
114
115 ret = i2c_compat_get_device(chip_addr, 1, &dev);
116 if (ret)
117 return 0xff;
118 return dm_i2c_reg_read(dev, offset);
119}
120
121void i2c_reg_write(uint8_t chip_addr, uint8_t offset, uint8_t val)
122{
123 struct udevice *dev;
124 int ret;
125
126 ret = i2c_compat_get_device(chip_addr, 1, &dev);
127 if (!ret)
128 dm_i2c_reg_write(dev, offset, val);
129}