This source file includes following definitions.
- scmi_dev_match_id
- scmi_dev_match
- scmi_protocol_init
- scmi_dev_probe
- scmi_dev_remove
- scmi_driver_register
- scmi_driver_unregister
- scmi_device_release
- scmi_device_create
- scmi_device_destroy
- scmi_set_handle
- scmi_protocol_register
- scmi_protocol_unregister
- __scmi_devices_unregister
- scmi_devices_unregister
- scmi_bus_init
- scmi_bus_exit
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7
8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10 #include <linux/types.h>
11 #include <linux/module.h>
12 #include <linux/kernel.h>
13 #include <linux/slab.h>
14 #include <linux/device.h>
15
16 #include "common.h"
17
18 static DEFINE_IDA(scmi_bus_id);
19 static DEFINE_IDR(scmi_protocols);
20 static DEFINE_SPINLOCK(protocol_lock);
21
22 static const struct scmi_device_id *
23 scmi_dev_match_id(struct scmi_device *scmi_dev, struct scmi_driver *scmi_drv)
24 {
25 const struct scmi_device_id *id = scmi_drv->id_table;
26
27 if (!id)
28 return NULL;
29
30 for (; id->protocol_id; id++)
31 if (id->protocol_id == scmi_dev->protocol_id)
32 return id;
33
34 return NULL;
35 }
36
37 static int scmi_dev_match(struct device *dev, struct device_driver *drv)
38 {
39 struct scmi_driver *scmi_drv = to_scmi_driver(drv);
40 struct scmi_device *scmi_dev = to_scmi_dev(dev);
41 const struct scmi_device_id *id;
42
43 id = scmi_dev_match_id(scmi_dev, scmi_drv);
44 if (id)
45 return 1;
46
47 return 0;
48 }
49
50 static int scmi_protocol_init(int protocol_id, struct scmi_handle *handle)
51 {
52 scmi_prot_init_fn_t fn = idr_find(&scmi_protocols, protocol_id);
53
54 if (unlikely(!fn))
55 return -EINVAL;
56 return fn(handle);
57 }
58
59 static int scmi_dev_probe(struct device *dev)
60 {
61 struct scmi_driver *scmi_drv = to_scmi_driver(dev->driver);
62 struct scmi_device *scmi_dev = to_scmi_dev(dev);
63 const struct scmi_device_id *id;
64 int ret;
65
66 id = scmi_dev_match_id(scmi_dev, scmi_drv);
67 if (!id)
68 return -ENODEV;
69
70 if (!scmi_dev->handle)
71 return -EPROBE_DEFER;
72
73 ret = scmi_protocol_init(scmi_dev->protocol_id, scmi_dev->handle);
74 if (ret)
75 return ret;
76
77 return scmi_drv->probe(scmi_dev);
78 }
79
80 static int scmi_dev_remove(struct device *dev)
81 {
82 struct scmi_driver *scmi_drv = to_scmi_driver(dev->driver);
83 struct scmi_device *scmi_dev = to_scmi_dev(dev);
84
85 if (scmi_drv->remove)
86 scmi_drv->remove(scmi_dev);
87
88 return 0;
89 }
90
91 static struct bus_type scmi_bus_type = {
92 .name = "scmi_protocol",
93 .match = scmi_dev_match,
94 .probe = scmi_dev_probe,
95 .remove = scmi_dev_remove,
96 };
97
98 int scmi_driver_register(struct scmi_driver *driver, struct module *owner,
99 const char *mod_name)
100 {
101 int retval;
102
103 driver->driver.bus = &scmi_bus_type;
104 driver->driver.name = driver->name;
105 driver->driver.owner = owner;
106 driver->driver.mod_name = mod_name;
107
108 retval = driver_register(&driver->driver);
109 if (!retval)
110 pr_debug("registered new scmi driver %s\n", driver->name);
111
112 return retval;
113 }
114 EXPORT_SYMBOL_GPL(scmi_driver_register);
115
116 void scmi_driver_unregister(struct scmi_driver *driver)
117 {
118 driver_unregister(&driver->driver);
119 }
120 EXPORT_SYMBOL_GPL(scmi_driver_unregister);
121
122 static void scmi_device_release(struct device *dev)
123 {
124 kfree(to_scmi_dev(dev));
125 }
126
127 struct scmi_device *
128 scmi_device_create(struct device_node *np, struct device *parent, int protocol)
129 {
130 int id, retval;
131 struct scmi_device *scmi_dev;
132
133 scmi_dev = kzalloc(sizeof(*scmi_dev), GFP_KERNEL);
134 if (!scmi_dev)
135 return NULL;
136
137 id = ida_simple_get(&scmi_bus_id, 1, 0, GFP_KERNEL);
138 if (id < 0) {
139 kfree(scmi_dev);
140 return NULL;
141 }
142
143 scmi_dev->id = id;
144 scmi_dev->protocol_id = protocol;
145 scmi_dev->dev.parent = parent;
146 scmi_dev->dev.of_node = np;
147 scmi_dev->dev.bus = &scmi_bus_type;
148 scmi_dev->dev.release = scmi_device_release;
149 dev_set_name(&scmi_dev->dev, "scmi_dev.%d", id);
150
151 retval = device_register(&scmi_dev->dev);
152 if (retval)
153 goto put_dev;
154
155 return scmi_dev;
156 put_dev:
157 put_device(&scmi_dev->dev);
158 ida_simple_remove(&scmi_bus_id, id);
159 return NULL;
160 }
161
162 void scmi_device_destroy(struct scmi_device *scmi_dev)
163 {
164 scmi_handle_put(scmi_dev->handle);
165 ida_simple_remove(&scmi_bus_id, scmi_dev->id);
166 device_unregister(&scmi_dev->dev);
167 }
168
169 void scmi_set_handle(struct scmi_device *scmi_dev)
170 {
171 scmi_dev->handle = scmi_handle_get(&scmi_dev->dev);
172 }
173
174 int scmi_protocol_register(int protocol_id, scmi_prot_init_fn_t fn)
175 {
176 int ret;
177
178 spin_lock(&protocol_lock);
179 ret = idr_alloc(&scmi_protocols, fn, protocol_id, protocol_id + 1,
180 GFP_ATOMIC);
181 spin_unlock(&protocol_lock);
182 if (ret != protocol_id)
183 pr_err("unable to allocate SCMI idr slot, err %d\n", ret);
184
185 return ret;
186 }
187 EXPORT_SYMBOL_GPL(scmi_protocol_register);
188
189 void scmi_protocol_unregister(int protocol_id)
190 {
191 spin_lock(&protocol_lock);
192 idr_remove(&scmi_protocols, protocol_id);
193 spin_unlock(&protocol_lock);
194 }
195 EXPORT_SYMBOL_GPL(scmi_protocol_unregister);
196
197 static int __scmi_devices_unregister(struct device *dev, void *data)
198 {
199 struct scmi_device *scmi_dev = to_scmi_dev(dev);
200
201 scmi_device_destroy(scmi_dev);
202 return 0;
203 }
204
205 static void scmi_devices_unregister(void)
206 {
207 bus_for_each_dev(&scmi_bus_type, NULL, NULL, __scmi_devices_unregister);
208 }
209
210 static int __init scmi_bus_init(void)
211 {
212 int retval;
213
214 retval = bus_register(&scmi_bus_type);
215 if (retval)
216 pr_err("scmi protocol bus register failed (%d)\n", retval);
217
218 return retval;
219 }
220 subsys_initcall(scmi_bus_init);
221
222 static void __exit scmi_bus_exit(void)
223 {
224 scmi_devices_unregister();
225 bus_unregister(&scmi_bus_type);
226 ida_destroy(&scmi_bus_id);
227 }
228 module_exit(scmi_bus_exit);