4 * Copyright (c) 2014 Google, Inc
6 * SPDX-License-Identifier: GPL-2.0+
16 #include <dm/device-internal.h>
19 DECLARE_GLOBAL_DATA_PTR;
21 struct dm_sandbox_i2c_emul_priv {
25 static int get_emul(struct udevice *dev, struct udevice **devp,
26 struct dm_i2c_ops **opsp)
28 struct dm_i2c_chip *priv;
33 priv = dev_get_parentdata(dev);
35 ret = dm_scan_fdt_node(dev, gd->fdt_blob, dev->of_offset,
40 ret = device_get_child(dev, 0, &priv->emul);
45 *opsp = i2c_get_ops(priv->emul);
50 static int sandbox_i2c_xfer(struct udevice *bus, struct i2c_msg *msg,
53 struct dm_i2c_bus *i2c = bus->uclass_priv;
54 struct dm_i2c_ops *ops;
55 struct udevice *emul, *dev;
59 /* Special test code to return success but with no emulation */
60 if (msg->addr == SANDBOX_I2C_TEST_ADDR)
63 ret = i2c_get_chip(bus, msg->addr, &dev);
67 ret = get_emul(dev, &emul, &ops);
72 * For testing, don't allow writing above 100KHz for writes and
76 if (i2c->speed_hz > (is_read ? 400000 : 100000))
78 return ops->xfer(emul, msg, nmsgs);
81 static const struct dm_i2c_ops sandbox_i2c_ops = {
82 .xfer = sandbox_i2c_xfer,
85 static int sandbox_i2c_child_pre_probe(struct udevice *dev)
87 struct dm_i2c_chip *i2c_chip = dev_get_parentdata(dev);
89 /* Ignore our test address */
90 if (i2c_chip->chip_addr == SANDBOX_I2C_TEST_ADDR)
92 if (dev->of_offset == -1)
95 return i2c_chip_ofdata_to_platdata(gd->fdt_blob, dev->of_offset,
99 static const struct udevice_id sandbox_i2c_ids[] = {
100 { .compatible = "sandbox,i2c" },
104 U_BOOT_DRIVER(i2c_sandbox) = {
105 .name = "i2c_sandbox",
107 .of_match = sandbox_i2c_ids,
108 .per_child_auto_alloc_size = sizeof(struct dm_i2c_chip),
109 .child_pre_probe = sandbox_i2c_child_pre_probe,
110 .ops = &sandbox_i2c_ops,