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9251345d VK |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | // Copyright(c) 2015-17 Intel Corporation. | |
3 | ||
4 | #include <linux/module.h> | |
5 | #include <linux/mod_devicetable.h> | |
6 | #include <linux/pm_domain.h> | |
7 | #include <linux/soundwire/sdw.h> | |
8 | #include <linux/soundwire/sdw_type.h> | |
9 | ||
10 | /** | |
11 | * sdw_get_device_id - find the matching SoundWire device id | |
12 | * @slave: SoundWire Slave Device | |
13 | * @drv: SoundWire Slave Driver | |
14 | * | |
15 | * The match is done by comparing the mfg_id and part_id from the | |
16 | * struct sdw_device_id. | |
17 | */ | |
18 | static const struct sdw_device_id * | |
19 | sdw_get_device_id(struct sdw_slave *slave, struct sdw_driver *drv) | |
20 | { | |
21 | const struct sdw_device_id *id = drv->id_table; | |
22 | ||
23 | while (id && id->mfg_id) { | |
24 | if (slave->id.mfg_id == id->mfg_id && | |
25 | slave->id.part_id == id->part_id) | |
26 | return id; | |
27 | id++; | |
28 | } | |
29 | ||
30 | return NULL; | |
31 | } | |
32 | ||
33 | static int sdw_bus_match(struct device *dev, struct device_driver *ddrv) | |
34 | { | |
35 | struct sdw_slave *slave = dev_to_sdw_dev(dev); | |
36 | struct sdw_driver *drv = drv_to_sdw_driver(ddrv); | |
37 | ||
38 | return !!sdw_get_device_id(slave, drv); | |
39 | } | |
40 | ||
41 | int sdw_slave_modalias(const struct sdw_slave *slave, char *buf, size_t size) | |
42 | { | |
43 | /* modalias is sdw:m<mfg_id>p<part_id> */ | |
44 | ||
45 | return snprintf(buf, size, "sdw:m%04Xp%04X\n", | |
46 | slave->id.mfg_id, slave->id.part_id); | |
47 | } | |
48 | ||
49 | static int sdw_uevent(struct device *dev, struct kobj_uevent_env *env) | |
50 | { | |
51 | struct sdw_slave *slave = dev_to_sdw_dev(dev); | |
52 | char modalias[32]; | |
53 | ||
54 | sdw_slave_modalias(slave, modalias, sizeof(modalias)); | |
55 | ||
56 | if (add_uevent_var(env, "MODALIAS=%s", modalias)) | |
57 | return -ENOMEM; | |
58 | ||
59 | return 0; | |
60 | } | |
61 | ||
62 | struct bus_type sdw_bus_type = { | |
63 | .name = "soundwire", | |
64 | .match = sdw_bus_match, | |
65 | .uevent = sdw_uevent, | |
66 | }; | |
67 | EXPORT_SYMBOL_GPL(sdw_bus_type); | |
68 | ||
69 | static int sdw_drv_probe(struct device *dev) | |
70 | { | |
71 | struct sdw_slave *slave = dev_to_sdw_dev(dev); | |
72 | struct sdw_driver *drv = drv_to_sdw_driver(dev->driver); | |
73 | const struct sdw_device_id *id; | |
74 | int ret; | |
75 | ||
76 | id = sdw_get_device_id(slave, drv); | |
77 | if (!id) | |
78 | return -ENODEV; | |
79 | ||
80 | /* | |
81 | * attach to power domain but don't turn on (last arg) | |
82 | */ | |
83 | ret = dev_pm_domain_attach(dev, false); | |
84 | if (ret != -EPROBE_DEFER) { | |
85 | ret = drv->probe(slave, id); | |
86 | if (ret) { | |
87 | dev_err(dev, "Probe of %s failed: %d\n", drv->name, ret); | |
88 | dev_pm_domain_detach(dev, false); | |
89 | } | |
90 | } | |
91 | ||
92 | return ret; | |
93 | } | |
94 | ||
95 | static int sdw_drv_remove(struct device *dev) | |
96 | { | |
97 | struct sdw_slave *slave = dev_to_sdw_dev(dev); | |
98 | struct sdw_driver *drv = drv_to_sdw_driver(dev->driver); | |
99 | int ret = 0; | |
100 | ||
101 | if (drv->remove) | |
102 | ret = drv->remove(slave); | |
103 | ||
104 | dev_pm_domain_detach(dev, false); | |
105 | ||
106 | return ret; | |
107 | } | |
108 | ||
109 | static void sdw_drv_shutdown(struct device *dev) | |
110 | { | |
111 | struct sdw_slave *slave = dev_to_sdw_dev(dev); | |
112 | struct sdw_driver *drv = drv_to_sdw_driver(dev->driver); | |
113 | ||
114 | if (drv->shutdown) | |
115 | drv->shutdown(slave); | |
116 | } | |
117 | ||
118 | /** | |
119 | * __sdw_register_driver() - register a SoundWire Slave driver | |
120 | * @drv: driver to register | |
121 | * @owner: owning module/driver | |
122 | * | |
123 | * Return: zero on success, else a negative error code. | |
124 | */ | |
125 | int __sdw_register_driver(struct sdw_driver *drv, struct module *owner) | |
126 | { | |
127 | drv->driver.bus = &sdw_bus_type; | |
128 | ||
129 | if (!drv->probe) { | |
130 | pr_err("driver %s didn't provide SDW probe routine\n", | |
131 | drv->name); | |
132 | return -EINVAL; | |
133 | } | |
134 | ||
135 | drv->driver.owner = owner; | |
136 | drv->driver.probe = sdw_drv_probe; | |
137 | ||
138 | if (drv->remove) | |
139 | drv->driver.remove = sdw_drv_remove; | |
140 | ||
141 | if (drv->shutdown) | |
142 | drv->driver.shutdown = sdw_drv_shutdown; | |
143 | ||
144 | return driver_register(&drv->driver); | |
145 | } | |
146 | EXPORT_SYMBOL_GPL(__sdw_register_driver); | |
147 | ||
148 | /** | |
149 | * sdw_unregister_driver() - unregisters the SoundWire Slave driver | |
150 | * @drv: driver to unregister | |
151 | */ | |
152 | void sdw_unregister_driver(struct sdw_driver *drv) | |
153 | { | |
154 | driver_unregister(&drv->driver); | |
155 | } | |
156 | EXPORT_SYMBOL_GPL(sdw_unregister_driver); | |
157 | ||
158 | static int __init sdw_bus_init(void) | |
159 | { | |
160 | return bus_register(&sdw_bus_type); | |
161 | } | |
162 | ||
163 | static void __exit sdw_bus_exit(void) | |
164 | { | |
165 | bus_unregister(&sdw_bus_type); | |
166 | } | |
167 | ||
168 | postcore_initcall(sdw_bus_init); | |
169 | module_exit(sdw_bus_exit); | |
170 | ||
171 | MODULE_DESCRIPTION("SoundWire bus"); | |
172 | MODULE_LICENSE("GPL v2"); |