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Tom Rini83d290c2018-05-06 17:58:06 -04001// SPDX-License-Identifier: GPL-2.0+
Simon Glassc70c71d2014-12-10 08:55:49 -07002/*
3 * Copyright (c) 2014 Google, Inc
Simon Glassc70c71d2014-12-10 08:55:49 -07004 */
5
Patrick Delaunayb953ec22021-04-27 11:02:19 +02006#define LOG_CATEGORY UCLASS_I2C_EMUL
7
Simon Glassc70c71d2014-12-10 08:55:49 -07008#include <common.h>
9#include <dm.h>
10#include <i2c.h>
Simon Glassf7ae49f2020-05-10 11:40:05 -060011#include <log.h>
Simon Glasse62ad9c2021-03-15 17:25:27 +130012#include <asm/i2c.h>
Simon Glassb7c25b12018-11-18 08:14:33 -070013#include <dm/device-internal.h>
14#include <dm/uclass-internal.h>
15
16/*
17 * i2c emulation works using an 'emul' node at the bus level. Each device in
18 * that node is in the UCLASS_I2C_EMUL uclass, and emulates one i2c device. A
19 * pointer to the device it emulates is in the 'dev' property of the emul device
Simon Glass8a8d24b2020-12-03 16:55:23 -070020 * uclass plat (struct i2c_emul_plat), put there by i2c_emul_find().
Simon Glassb7c25b12018-11-18 08:14:33 -070021 * When sandbox wants an emulator for a device, it calls i2c_emul_find() which
22 * searches for the emulator with the correct address. To find the device for an
23 * emulator, call i2c_emul_get_device().
24 *
25 * The 'emul' node is in the UCLASS_I2C_EMUL_PARENT uclass. We use a separate
26 * uclass so avoid having strange devices on the I2C bus.
27 */
28
Simon Glassb7c25b12018-11-18 08:14:33 -070029struct udevice *i2c_emul_get_device(struct udevice *emul)
30{
Simon Glass8a8d24b2020-12-03 16:55:23 -070031 struct i2c_emul_uc_plat *uc_plat = dev_get_uclass_plat(emul);
Simon Glassb7c25b12018-11-18 08:14:33 -070032
33 return uc_plat->dev;
34}
35
Simon Glass728d04c2021-03-15 17:25:30 +130036void i2c_emul_set_idx(struct udevice *dev, int emul_idx)
37{
38 struct dm_i2c_chip *plat = dev_get_parent_plat(dev);
39
40 plat->emul_idx = emul_idx;
41}
42
Simon Glassb7c25b12018-11-18 08:14:33 -070043int i2c_emul_find(struct udevice *dev, struct udevice **emulp)
44{
Simon Glass8a8d24b2020-12-03 16:55:23 -070045 struct i2c_emul_uc_plat *uc_plat;
Simon Glassb7c25b12018-11-18 08:14:33 -070046 struct udevice *emul;
47 int ret;
48
Simon Glass728d04c2021-03-15 17:25:30 +130049 if (!CONFIG_IS_ENABLED(OF_PLATDATA)) {
50 ret = uclass_find_device_by_phandle(UCLASS_I2C_EMUL, dev,
51 "sandbox,emul", &emul);
52 } else {
53 struct dm_i2c_chip *plat = dev_get_parent_plat(dev);
54
55 ret = device_get_by_ofplat_idx(plat->emul_idx, &emul);
56 }
Simon Glassb7c25b12018-11-18 08:14:33 -070057 if (ret) {
58 log_err("No emulators for device '%s'\n", dev->name);
59 return ret;
60 }
Simon Glasscaa4daa2020-12-03 16:55:18 -070061 uc_plat = dev_get_uclass_plat(emul);
Simon Glassb7c25b12018-11-18 08:14:33 -070062 uc_plat->dev = dev;
63 *emulp = emul;
64
65 return device_probe(emul);
66}
Simon Glassc70c71d2014-12-10 08:55:49 -070067
68UCLASS_DRIVER(i2c_emul) = {
69 .id = UCLASS_I2C_EMUL,
70 .name = "i2c_emul",
Simon Glass8a8d24b2020-12-03 16:55:23 -070071 .per_device_plat_auto = sizeof(struct i2c_emul_uc_plat),
Simon Glassb7c25b12018-11-18 08:14:33 -070072};
73
74/*
Simon Glasscaa4daa2020-12-03 16:55:18 -070075 * This uclass is a child of the i2c bus. Its plat is not defined here so
Simon Glassb7c25b12018-11-18 08:14:33 -070076 * is defined by its parent, UCLASS_I2C, which uses struct dm_i2c_chip. See
Simon Glasscaa4daa2020-12-03 16:55:18 -070077 * per_child_plat_auto in UCLASS_DRIVER(i2c).
Simon Glassb7c25b12018-11-18 08:14:33 -070078 */
79UCLASS_DRIVER(i2c_emul_parent) = {
80 .id = UCLASS_I2C_EMUL_PARENT,
81 .name = "i2c_emul_parent",
Simon Glass95397382021-08-07 07:24:04 -060082#if CONFIG_IS_ENABLED(OF_REAL)
Simon Glassb7c25b12018-11-18 08:14:33 -070083 .post_bind = dm_scan_fdt_dev,
Simon Glass67507e42020-10-03 11:31:34 -060084#endif
Simon Glassb7c25b12018-11-18 08:14:33 -070085};
86
87static const struct udevice_id i2c_emul_parent_ids[] = {
88 { .compatible = "sandbox,i2c-emul-parent" },
89 { }
90};
91
Simon Glassc4085d72021-02-03 06:01:17 -070092U_BOOT_DRIVER(sandbox_i2c_emul_parent) = {
93 .name = "sandbox_i2c_emul_parent",
Simon Glassb7c25b12018-11-18 08:14:33 -070094 .id = UCLASS_I2C_EMUL_PARENT,
95 .of_match = i2c_emul_parent_ids,
Simon Glassc70c71d2014-12-10 08:55:49 -070096};