]>
Commit | Line | Data |
---|---|---|
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> | |
bf03473d | 9 | #include "bus.h" |
9251345d VK |
10 | |
11 | /** | |
12 | * sdw_get_device_id - find the matching SoundWire device id | |
13 | * @slave: SoundWire Slave Device | |
14 | * @drv: SoundWire Slave Driver | |
15 | * | |
16 | * The match is done by comparing the mfg_id and part_id from the | |
17 | * struct sdw_device_id. | |
18 | */ | |
19 | static const struct sdw_device_id * | |
20 | sdw_get_device_id(struct sdw_slave *slave, struct sdw_driver *drv) | |
21 | { | |
22 | const struct sdw_device_id *id = drv->id_table; | |
23 | ||
24 | while (id && id->mfg_id) { | |
25 | if (slave->id.mfg_id == id->mfg_id && | |
26 | slave->id.part_id == id->part_id) | |
27 | return id; | |
28 | id++; | |
29 | } | |
30 | ||
31 | return NULL; | |
32 | } | |
33 | ||
34 | static int sdw_bus_match(struct device *dev, struct device_driver *ddrv) | |
35 | { | |
36 | struct sdw_slave *slave = dev_to_sdw_dev(dev); | |
37 | struct sdw_driver *drv = drv_to_sdw_driver(ddrv); | |
38 | ||
39 | return !!sdw_get_device_id(slave, drv); | |
40 | } | |
41 | ||
42 | int sdw_slave_modalias(const struct sdw_slave *slave, char *buf, size_t size) | |
43 | { | |
44 | /* modalias is sdw:m<mfg_id>p<part_id> */ | |
45 | ||
46 | return snprintf(buf, size, "sdw:m%04Xp%04X\n", | |
47 | slave->id.mfg_id, slave->id.part_id); | |
48 | } | |
49 | ||
50 | static int sdw_uevent(struct device *dev, struct kobj_uevent_env *env) | |
51 | { | |
52 | struct sdw_slave *slave = dev_to_sdw_dev(dev); | |
53 | char modalias[32]; | |
54 | ||
55 | sdw_slave_modalias(slave, modalias, sizeof(modalias)); | |
56 | ||
57 | if (add_uevent_var(env, "MODALIAS=%s", modalias)) | |
58 | return -ENOMEM; | |
59 | ||
60 | return 0; | |
61 | } | |
62 | ||
63 | struct bus_type sdw_bus_type = { | |
64 | .name = "soundwire", | |
65 | .match = sdw_bus_match, | |
66 | .uevent = sdw_uevent, | |
67 | }; | |
68 | EXPORT_SYMBOL_GPL(sdw_bus_type); | |
69 | ||
70 | static int sdw_drv_probe(struct device *dev) | |
71 | { | |
72 | struct sdw_slave *slave = dev_to_sdw_dev(dev); | |
73 | struct sdw_driver *drv = drv_to_sdw_driver(dev->driver); | |
74 | const struct sdw_device_id *id; | |
75 | int ret; | |
76 | ||
77 | id = sdw_get_device_id(slave, drv); | |
78 | if (!id) | |
79 | return -ENODEV; | |
80 | ||
56d4fe31 VK |
81 | slave->ops = drv->ops; |
82 | ||
9251345d VK |
83 | /* |
84 | * attach to power domain but don't turn on (last arg) | |
85 | */ | |
86 | ret = dev_pm_domain_attach(dev, false); | |
56d4fe31 VK |
87 | if (ret) |
88 | return ret; | |
89 | ||
29ffcc88 UH |
90 | ret = drv->probe(slave, id); |
91 | if (ret) { | |
92 | dev_err(dev, "Probe of %s failed: %d\n", drv->name, ret); | |
93 | dev_pm_domain_detach(dev, false); | |
94 | return ret; | |
95 | } | |
96 | ||
56d4fe31 VK |
97 | /* device is probed so let's read the properties now */ |
98 | if (slave->ops && slave->ops->read_prop) | |
99 | slave->ops->read_prop(slave); | |
100 | ||
101 | /* | |
102 | * Check for valid clk_stop_timeout, use DisCo worst case value of | |
103 | * 300ms | |
104 | * | |
105 | * TODO: check the timeouts and driver removal case | |
106 | */ | |
107 | if (slave->prop.clk_stop_timeout == 0) | |
108 | slave->prop.clk_stop_timeout = 300; | |
109 | ||
110 | slave->bus->clk_stop_timeout = max_t(u32, slave->bus->clk_stop_timeout, | |
74a8d802 | 111 | slave->prop.clk_stop_timeout); |
56d4fe31 VK |
112 | |
113 | return 0; | |
9251345d VK |
114 | } |
115 | ||
116 | static int sdw_drv_remove(struct device *dev) | |
117 | { | |
118 | struct sdw_slave *slave = dev_to_sdw_dev(dev); | |
119 | struct sdw_driver *drv = drv_to_sdw_driver(dev->driver); | |
120 | int ret = 0; | |
121 | ||
122 | if (drv->remove) | |
123 | ret = drv->remove(slave); | |
124 | ||
125 | dev_pm_domain_detach(dev, false); | |
126 | ||
127 | return ret; | |
128 | } | |
129 | ||
130 | static void sdw_drv_shutdown(struct device *dev) | |
131 | { | |
132 | struct sdw_slave *slave = dev_to_sdw_dev(dev); | |
133 | struct sdw_driver *drv = drv_to_sdw_driver(dev->driver); | |
134 | ||
135 | if (drv->shutdown) | |
136 | drv->shutdown(slave); | |
137 | } | |
138 | ||
139 | /** | |
140 | * __sdw_register_driver() - register a SoundWire Slave driver | |
141 | * @drv: driver to register | |
142 | * @owner: owning module/driver | |
143 | * | |
144 | * Return: zero on success, else a negative error code. | |
145 | */ | |
146 | int __sdw_register_driver(struct sdw_driver *drv, struct module *owner) | |
147 | { | |
148 | drv->driver.bus = &sdw_bus_type; | |
149 | ||
150 | if (!drv->probe) { | |
151 | pr_err("driver %s didn't provide SDW probe routine\n", | |
74a8d802 | 152 | drv->name); |
9251345d VK |
153 | return -EINVAL; |
154 | } | |
155 | ||
156 | drv->driver.owner = owner; | |
157 | drv->driver.probe = sdw_drv_probe; | |
158 | ||
159 | if (drv->remove) | |
160 | drv->driver.remove = sdw_drv_remove; | |
161 | ||
162 | if (drv->shutdown) | |
163 | drv->driver.shutdown = sdw_drv_shutdown; | |
164 | ||
165 | return driver_register(&drv->driver); | |
166 | } | |
167 | EXPORT_SYMBOL_GPL(__sdw_register_driver); | |
168 | ||
169 | /** | |
170 | * sdw_unregister_driver() - unregisters the SoundWire Slave driver | |
171 | * @drv: driver to unregister | |
172 | */ | |
173 | void sdw_unregister_driver(struct sdw_driver *drv) | |
174 | { | |
175 | driver_unregister(&drv->driver); | |
176 | } | |
177 | EXPORT_SYMBOL_GPL(sdw_unregister_driver); | |
178 | ||
179 | static int __init sdw_bus_init(void) | |
180 | { | |
bf03473d | 181 | sdw_debugfs_init(); |
9251345d VK |
182 | return bus_register(&sdw_bus_type); |
183 | } | |
184 | ||
185 | static void __exit sdw_bus_exit(void) | |
186 | { | |
bf03473d | 187 | sdw_debugfs_exit(); |
9251345d VK |
188 | bus_unregister(&sdw_bus_type); |
189 | } | |
190 | ||
191 | postcore_initcall(sdw_bus_init); | |
192 | module_exit(sdw_bus_exit); | |
193 | ||
194 | MODULE_DESCRIPTION("SoundWire bus"); | |
195 | MODULE_LICENSE("GPL v2"); |