aboutsummaryrefslogtreecommitdiff
path: root/cmd/bind.c
blob: 3a59eefd5c58bc059ba26d62e532d45097de0216 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (c) 2018 JJ Hiblot <jjhiblot@ti.com>
 */

#include <command.h>
#include <dm.h>
#include <dm/device-internal.h>
#include <dm/lists.h>
#include <dm/root.h>
#include <dm/uclass-internal.h>

static int bind_by_class_index(const char *uclass, int index,
			       const char *drv_name)
{
	static enum uclass_id uclass_id;
	struct udevice *dev;
	struct udevice *parent;
	int ret;
	struct driver *drv;

	drv = lists_driver_lookup_name(drv_name);
	if (!drv) {
		printf("Cannot find driver '%s'\n", drv_name);
		return -ENOENT;
	}

	uclass_id = uclass_get_by_name(uclass);
	if (uclass_id == UCLASS_INVALID) {
		printf("%s is not a valid uclass\n", uclass);
		return -EINVAL;
	}

	ret = uclass_find_device(uclass_id, index, &parent);
	if (!parent || ret) {
		printf("Cannot find device %d of class %s\n", index, uclass);
		return ret;
	}

	ret = device_bind_with_driver_data(parent, drv, drv->name, 0,
					   ofnode_null(), &dev);
	if (!dev || ret) {
		printf("Unable to bind. err:%d\n", ret);
		return ret;
	}

	return 0;
}

static int find_dev(const char *uclass, int index, struct udevice **devp)
{
	static enum uclass_id uclass_id;
	int rc;

	uclass_id = uclass_get_by_name(uclass);
	if (uclass_id == UCLASS_INVALID) {
		printf("%s is not a valid uclass\n", uclass);
		return -EINVAL;
	}

	rc = uclass_find_device(uclass_id, index, devp);
	if (!*devp || rc) {
		printf("Cannot find device %d of class %s\n", index, uclass);
		return rc;
	}

	return 0;
}

static int unbind_by_class_index(const char *uclass, int index)
{
	int ret;
	struct udevice *dev;

	ret = find_dev(uclass, index, &dev);
	if (ret)
		return ret;

	ret = device_remove(dev, DM_REMOVE_NORMAL);
	if (ret) {
		printf("Unable to remove. err:%d\n", ret);
		return ret;
	}

	ret = device_unbind(dev);
	if (ret) {
		printf("Unable to unbind. err:%d\n", ret);
		return ret;
	}

	return 0;
}

static int unbind_child_by_class_index(const char *uclass, int index,
				       const char *drv_name)
{
	struct udevice *parent;
	int ret;
	struct driver *drv;

	drv = lists_driver_lookup_name(drv_name);
	if (!drv) {
		printf("Cannot find driver '%s'\n", drv_name);
		return -ENOENT;
	}

	ret = find_dev(uclass, index, &parent);
	if (ret)
		return ret;

	ret = device_chld_remove(parent, drv, DM_REMOVE_NORMAL);
	if (ret)
		printf("Unable to remove all. err:%d\n", ret);

	ret = device_chld_unbind(parent, drv);
	if (ret)
		printf("Unable to unbind all. err:%d\n", ret);

	return ret;
}

static int bind_by_node_path(const char *path, const char *drv_name)
{
	struct udevice *dev;
	struct udevice *parent = NULL;
	int ret;
	ofnode ofnode;
	struct driver *drv;

	drv = lists_driver_lookup_name(drv_name);
	if (!drv) {
		printf("%s is not a valid driver name\n", drv_name);
		return -ENOENT;
	}

	ofnode = ofnode_path(path);
	if (!ofnode_valid(ofnode)) {
		printf("%s is not a valid node path\n", path);
		return -EINVAL;
	}

	while (ofnode_valid(ofnode)) {
		if (!device_find_global_by_ofnode(ofnode, &parent))
			break;
		ofnode = ofnode_get_parent(ofnode);
	}

	if (!parent) {
		printf("Cannot find a parent device for node path %s\n", path);
		return -ENODEV;
	}

	ofnode = ofnode_path(path);
	ret = lists_bind_fdt(parent, ofnode, &dev, drv, false);

	if (!dev || ret) {
		printf("Unable to bind. err:%d\n", ret);
		return ret;
	}

	return 0;
}

static int unbind_by_node_path(const char *path)
{
	struct udevice *dev;
	int ret;
	ofnode ofnode;

	ofnode = ofnode_path(path);
	if (!ofnode_valid(ofnode)) {
		printf("%s is not a valid node path\n", path);
		return -EINVAL;
	}

	ret = device_find_global_by_ofnode(ofnode, &dev);

	if (!dev || ret) {
		printf("Cannot find a device with path %s\n", path);
		return -ENODEV;
	}

	ret = device_remove(dev, DM_REMOVE_NORMAL);
	if (ret) {
		printf("Unable to remove. err:%d\n", ret);
		return ret;
	}

	ret = device_unbind(dev);
	if (ret) {
		printf("Unable to unbind. err:%d\n", ret);
		return ret;
	}

	return 0;
}

static int do_bind_unbind(struct cmd_tbl *cmdtp, int flag, int argc,
			  char *const argv[])
{
	int ret = 0;
	bool bind;
	bool by_node;

	if (argc < 2)
		return CMD_RET_USAGE;

	bind = (argv[0][0] == 'b');
	by_node = (argv[1][0] == '/');

	if (by_node && bind) {
		if (argc != 3)
			return CMD_RET_USAGE;
		ret = bind_by_node_path(argv[1], argv[2]);
	} else if (by_node && !bind) {
		if (argc != 2)
			return CMD_RET_USAGE;
		ret = unbind_by_node_path(argv[1]);
	} else if (!by_node && bind) {
		int index = (argc > 2) ? dectoul(argv[2], NULL) : 0;

		if (argc != 4)
			return CMD_RET_USAGE;
		ret = bind_by_class_index(argv[1], index, argv[3]);
	} else if (!by_node && !bind) {
		int index = (argc > 2) ? dectoul(argv[2], NULL) : 0;

		if (argc == 3)
			ret = unbind_by_class_index(argv[1], index);
		else if (argc == 4)
			ret = unbind_child_by_class_index(argv[1], index,
							  argv[3]);
		else
			return CMD_RET_USAGE;
	}

	if (ret)
		return CMD_RET_FAILURE;
	else
		return CMD_RET_SUCCESS;
}

U_BOOT_CMD(
	bind,	4,	0,	do_bind_unbind,
	"Bind a device to a driver",
	"<node path> <driver>\n"
	"bind <class> <index> <driver>\n"
	"Use 'dm tree' to list all devices registered in the driver model,\n"
	"their path, class, index and current driver.\n"
);

U_BOOT_CMD(
	unbind,	4,	0,	do_bind_unbind,
	"Unbind a device from a driver",
	"<node path>\n"
	"unbind <class> <index>\n"
	"unbind <class> <index> <driver>\n"
	"Use 'dm tree' to list all devices registered in the driver model,\n"
	"their path, class, index and current driver.\n"
);