1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * Copyright (c) 2014 Google, Inc
3*4882a593Smuzhiyun *
4*4882a593Smuzhiyun * SPDX-License-Identifier: GPL-2.0+
5*4882a593Smuzhiyun */
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun #include <common.h>
8*4882a593Smuzhiyun #include <dm.h>
9*4882a593Smuzhiyun #include <errno.h>
10*4882a593Smuzhiyun #include <i2c.h>
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun static int cur_busnum __attribute__((section(".data")));
13*4882a593Smuzhiyun
i2c_compat_get_device(uint chip_addr,int alen,struct udevice ** devp)14*4882a593Smuzhiyun static int i2c_compat_get_device(uint chip_addr, int alen,
15*4882a593Smuzhiyun struct udevice **devp)
16*4882a593Smuzhiyun {
17*4882a593Smuzhiyun struct dm_i2c_chip *chip;
18*4882a593Smuzhiyun int ret;
19*4882a593Smuzhiyun
20*4882a593Smuzhiyun ret = i2c_get_chip_for_busnum(cur_busnum, chip_addr, alen, devp);
21*4882a593Smuzhiyun if (ret)
22*4882a593Smuzhiyun return ret;
23*4882a593Smuzhiyun chip = dev_get_parent_platdata(*devp);
24*4882a593Smuzhiyun if (chip->offset_len != alen) {
25*4882a593Smuzhiyun printf("I2C chip %x: requested alen %d does not match chip offset_len %d\n",
26*4882a593Smuzhiyun chip_addr, alen, chip->offset_len);
27*4882a593Smuzhiyun return -EADDRNOTAVAIL;
28*4882a593Smuzhiyun }
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun return 0;
31*4882a593Smuzhiyun }
32*4882a593Smuzhiyun
i2c_probe(uint8_t chip_addr)33*4882a593Smuzhiyun int i2c_probe(uint8_t chip_addr)
34*4882a593Smuzhiyun {
35*4882a593Smuzhiyun struct udevice *bus, *dev;
36*4882a593Smuzhiyun int ret;
37*4882a593Smuzhiyun
38*4882a593Smuzhiyun ret = uclass_get_device_by_seq(UCLASS_I2C, cur_busnum, &bus);
39*4882a593Smuzhiyun if (ret) {
40*4882a593Smuzhiyun debug("Cannot find I2C bus %d: err=%d\n", cur_busnum, ret);
41*4882a593Smuzhiyun return ret;
42*4882a593Smuzhiyun }
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun if (!bus)
45*4882a593Smuzhiyun return -ENOENT;
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun return dm_i2c_probe(bus, chip_addr, 0, &dev);
48*4882a593Smuzhiyun }
49*4882a593Smuzhiyun
i2c_read(uint8_t chip_addr,unsigned int addr,int alen,uint8_t * buffer,int len)50*4882a593Smuzhiyun int i2c_read(uint8_t chip_addr, unsigned int addr, int alen, uint8_t *buffer,
51*4882a593Smuzhiyun int len)
52*4882a593Smuzhiyun {
53*4882a593Smuzhiyun struct udevice *dev;
54*4882a593Smuzhiyun int ret;
55*4882a593Smuzhiyun
56*4882a593Smuzhiyun ret = i2c_compat_get_device(chip_addr, alen, &dev);
57*4882a593Smuzhiyun if (ret)
58*4882a593Smuzhiyun return ret;
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun return dm_i2c_read(dev, addr, buffer, len);
61*4882a593Smuzhiyun }
62*4882a593Smuzhiyun
i2c_write(uint8_t chip_addr,unsigned int addr,int alen,uint8_t * buffer,int len)63*4882a593Smuzhiyun int i2c_write(uint8_t chip_addr, unsigned int addr, int alen, uint8_t *buffer,
64*4882a593Smuzhiyun int len)
65*4882a593Smuzhiyun {
66*4882a593Smuzhiyun struct udevice *dev;
67*4882a593Smuzhiyun int ret;
68*4882a593Smuzhiyun
69*4882a593Smuzhiyun ret = i2c_compat_get_device(chip_addr, alen, &dev);
70*4882a593Smuzhiyun if (ret)
71*4882a593Smuzhiyun return ret;
72*4882a593Smuzhiyun
73*4882a593Smuzhiyun return dm_i2c_write(dev, addr, buffer, len);
74*4882a593Smuzhiyun }
75*4882a593Smuzhiyun
i2c_get_bus_num_fdt(int node)76*4882a593Smuzhiyun int i2c_get_bus_num_fdt(int node)
77*4882a593Smuzhiyun {
78*4882a593Smuzhiyun struct udevice *bus;
79*4882a593Smuzhiyun int ret;
80*4882a593Smuzhiyun
81*4882a593Smuzhiyun ret = uclass_get_device_by_of_offset(UCLASS_I2C, node, &bus);
82*4882a593Smuzhiyun if (ret)
83*4882a593Smuzhiyun return ret;
84*4882a593Smuzhiyun
85*4882a593Smuzhiyun return bus->seq;
86*4882a593Smuzhiyun }
87*4882a593Smuzhiyun
i2c_get_bus_num(void)88*4882a593Smuzhiyun unsigned int i2c_get_bus_num(void)
89*4882a593Smuzhiyun {
90*4882a593Smuzhiyun return cur_busnum;
91*4882a593Smuzhiyun }
92*4882a593Smuzhiyun
i2c_set_bus_num(unsigned int bus)93*4882a593Smuzhiyun int i2c_set_bus_num(unsigned int bus)
94*4882a593Smuzhiyun {
95*4882a593Smuzhiyun cur_busnum = bus;
96*4882a593Smuzhiyun
97*4882a593Smuzhiyun return 0;
98*4882a593Smuzhiyun }
99*4882a593Smuzhiyun
i2c_init(int speed,int slaveaddr)100*4882a593Smuzhiyun void i2c_init(int speed, int slaveaddr)
101*4882a593Smuzhiyun {
102*4882a593Smuzhiyun /* Nothing to do here - the init happens through driver model */
103*4882a593Smuzhiyun }
104*4882a593Smuzhiyun
board_i2c_init(const void * blob)105*4882a593Smuzhiyun void board_i2c_init(const void *blob)
106*4882a593Smuzhiyun {
107*4882a593Smuzhiyun /* Nothing to do here - the init happens through driver model */
108*4882a593Smuzhiyun }
109*4882a593Smuzhiyun
i2c_reg_read(uint8_t chip_addr,uint8_t offset)110*4882a593Smuzhiyun uint8_t i2c_reg_read(uint8_t chip_addr, uint8_t offset)
111*4882a593Smuzhiyun {
112*4882a593Smuzhiyun struct udevice *dev;
113*4882a593Smuzhiyun int ret;
114*4882a593Smuzhiyun
115*4882a593Smuzhiyun ret = i2c_compat_get_device(chip_addr, 1, &dev);
116*4882a593Smuzhiyun if (ret)
117*4882a593Smuzhiyun return 0xff;
118*4882a593Smuzhiyun return dm_i2c_reg_read(dev, offset);
119*4882a593Smuzhiyun }
120*4882a593Smuzhiyun
i2c_reg_write(uint8_t chip_addr,uint8_t offset,uint8_t val)121*4882a593Smuzhiyun void i2c_reg_write(uint8_t chip_addr, uint8_t offset, uint8_t val)
122*4882a593Smuzhiyun {
123*4882a593Smuzhiyun struct udevice *dev;
124*4882a593Smuzhiyun int ret;
125*4882a593Smuzhiyun
126*4882a593Smuzhiyun ret = i2c_compat_get_device(chip_addr, 1, &dev);
127*4882a593Smuzhiyun if (!ret)
128*4882a593Smuzhiyun dm_i2c_reg_write(dev, offset, val);
129*4882a593Smuzhiyun }
130