Commit | Line | Data |
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457c8996 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
d068ebc2 TI |
2 | /* |
3 | * HD-audio core bus driver | |
4 | */ | |
5 | ||
6 | #include <linux/init.h> | |
7 | #include <linux/device.h> | |
8 | #include <linux/module.h> | |
9 | #include <linux/export.h> | |
10 | #include <sound/hdaudio.h> | |
e311782a | 11 | #include "trace.h" |
d068ebc2 | 12 | |
14752412 TI |
13 | static const struct hdac_bus_ops default_ops = { |
14 | .command = snd_hdac_bus_send_cmd, | |
15 | .get_response = snd_hdac_bus_get_response, | |
16 | }; | |
17 | ||
d068ebc2 TI |
18 | /** |
19 | * snd_hdac_bus_init - initialize a HD-audio bas bus | |
20 | * @bus: the pointer to bus object | |
14752412 TI |
21 | * @ops: bus verb operators |
22 | * @io_ops: lowlevel I/O operators | |
d068ebc2 TI |
23 | * |
24 | * Returns 0 if successful, or a negative error code. | |
25 | */ | |
26 | int snd_hdac_bus_init(struct hdac_bus *bus, struct device *dev, | |
14752412 TI |
27 | const struct hdac_bus_ops *ops, |
28 | const struct hdac_io_ops *io_ops) | |
d068ebc2 TI |
29 | { |
30 | memset(bus, 0, sizeof(*bus)); | |
31 | bus->dev = dev; | |
14752412 TI |
32 | if (ops) |
33 | bus->ops = ops; | |
34 | else | |
35 | bus->ops = &default_ops; | |
36 | bus->io_ops = io_ops; | |
37 | INIT_LIST_HEAD(&bus->stream_list); | |
d068ebc2 | 38 | INIT_LIST_HEAD(&bus->codec_list); |
18d43c9b | 39 | INIT_WORK(&bus->unsol_work, snd_hdac_bus_process_unsol_events); |
14752412 | 40 | spin_lock_init(&bus->reg_lock); |
d068ebc2 | 41 | mutex_init(&bus->cmd_mutex); |
d7a181da | 42 | mutex_init(&bus->lock); |
e61ab9f0 | 43 | INIT_LIST_HEAD(&bus->hlink_list); |
14752412 | 44 | bus->irq = -1; |
d068ebc2 TI |
45 | return 0; |
46 | } | |
47 | EXPORT_SYMBOL_GPL(snd_hdac_bus_init); | |
48 | ||
49 | /** | |
50 | * snd_hdac_bus_exit - clean up a HD-audio bas bus | |
51 | * @bus: the pointer to bus object | |
52 | */ | |
53 | void snd_hdac_bus_exit(struct hdac_bus *bus) | |
54 | { | |
14752412 | 55 | WARN_ON(!list_empty(&bus->stream_list)); |
d068ebc2 TI |
56 | WARN_ON(!list_empty(&bus->codec_list)); |
57 | cancel_work_sync(&bus->unsol_work); | |
58 | } | |
59 | EXPORT_SYMBOL_GPL(snd_hdac_bus_exit); | |
60 | ||
61 | /** | |
62 | * snd_hdac_bus_exec_verb - execute a HD-audio verb on the given bus | |
63 | * @bus: bus object | |
64 | * @cmd: HD-audio encoded verb | |
65 | * @res: pointer to store the response, NULL if performing asynchronously | |
66 | * | |
67 | * Returns 0 if successful, or a negative error code. | |
68 | */ | |
69 | int snd_hdac_bus_exec_verb(struct hdac_bus *bus, unsigned int addr, | |
70 | unsigned int cmd, unsigned int *res) | |
71 | { | |
72 | int err; | |
73 | ||
74 | mutex_lock(&bus->cmd_mutex); | |
75 | err = snd_hdac_bus_exec_verb_unlocked(bus, addr, cmd, res); | |
76 | mutex_unlock(&bus->cmd_mutex); | |
77 | return err; | |
78 | } | |
79 | EXPORT_SYMBOL_GPL(snd_hdac_bus_exec_verb); | |
80 | ||
81 | /** | |
82 | * snd_hdac_bus_exec_verb_unlocked - unlocked version | |
83 | * @bus: bus object | |
84 | * @cmd: HD-audio encoded verb | |
85 | * @res: pointer to store the response, NULL if performing asynchronously | |
86 | * | |
87 | * Returns 0 if successful, or a negative error code. | |
88 | */ | |
89 | int snd_hdac_bus_exec_verb_unlocked(struct hdac_bus *bus, unsigned int addr, | |
90 | unsigned int cmd, unsigned int *res) | |
91 | { | |
92 | unsigned int tmp; | |
93 | int err; | |
94 | ||
95 | if (cmd == ~0) | |
96 | return -EINVAL; | |
97 | ||
98 | if (res) | |
99 | *res = -1; | |
100 | else if (bus->sync_write) | |
101 | res = &tmp; | |
102 | for (;;) { | |
e311782a | 103 | trace_hda_send_cmd(bus, cmd); |
d068ebc2 TI |
104 | err = bus->ops->command(bus, cmd); |
105 | if (err != -EAGAIN) | |
106 | break; | |
107 | /* process pending verbs */ | |
108 | err = bus->ops->get_response(bus, addr, &tmp); | |
109 | if (err) | |
110 | break; | |
111 | } | |
e311782a | 112 | if (!err && res) { |
d068ebc2 | 113 | err = bus->ops->get_response(bus, addr, res); |
e311782a TI |
114 | trace_hda_get_response(bus, addr, *res); |
115 | } | |
d068ebc2 TI |
116 | return err; |
117 | } | |
118 | EXPORT_SYMBOL_GPL(snd_hdac_bus_exec_verb_unlocked); | |
119 | ||
120 | /** | |
121 | * snd_hdac_bus_queue_event - add an unsolicited event to queue | |
122 | * @bus: the BUS | |
123 | * @res: unsolicited event (lower 32bit of RIRB entry) | |
124 | * @res_ex: codec addr and flags (upper 32bit or RIRB entry) | |
125 | * | |
126 | * Adds the given event to the queue. The events are processed in | |
127 | * the workqueue asynchronously. Call this function in the interrupt | |
128 | * hanlder when RIRB receives an unsolicited event. | |
129 | */ | |
130 | void snd_hdac_bus_queue_event(struct hdac_bus *bus, u32 res, u32 res_ex) | |
131 | { | |
132 | unsigned int wp; | |
133 | ||
134 | if (!bus) | |
135 | return; | |
136 | ||
e311782a | 137 | trace_hda_unsol_event(bus, res, res_ex); |
d068ebc2 TI |
138 | wp = (bus->unsol_wp + 1) % HDA_UNSOL_QUEUE_SIZE; |
139 | bus->unsol_wp = wp; | |
140 | ||
141 | wp <<= 1; | |
142 | bus->unsol_queue[wp] = res; | |
143 | bus->unsol_queue[wp + 1] = res_ex; | |
144 | ||
145 | schedule_work(&bus->unsol_work); | |
146 | } | |
147 | EXPORT_SYMBOL_GPL(snd_hdac_bus_queue_event); | |
148 | ||
149 | /* | |
150 | * process queued unsolicited events | |
151 | */ | |
18d43c9b | 152 | void snd_hdac_bus_process_unsol_events(struct work_struct *work) |
d068ebc2 TI |
153 | { |
154 | struct hdac_bus *bus = container_of(work, struct hdac_bus, unsol_work); | |
155 | struct hdac_device *codec; | |
156 | struct hdac_driver *drv; | |
157 | unsigned int rp, caddr, res; | |
158 | ||
159 | while (bus->unsol_rp != bus->unsol_wp) { | |
160 | rp = (bus->unsol_rp + 1) % HDA_UNSOL_QUEUE_SIZE; | |
161 | bus->unsol_rp = rp; | |
162 | rp <<= 1; | |
163 | res = bus->unsol_queue[rp]; | |
164 | caddr = bus->unsol_queue[rp + 1]; | |
165 | if (!(caddr & (1 << 4))) /* no unsolicited event? */ | |
166 | continue; | |
167 | codec = bus->caddr_tbl[caddr & 0x0f]; | |
168 | if (!codec || !codec->dev.driver) | |
169 | continue; | |
170 | drv = drv_to_hdac_driver(codec->dev.driver); | |
171 | if (drv->unsol_event) | |
172 | drv->unsol_event(codec, res); | |
173 | } | |
174 | } | |
18d43c9b | 175 | EXPORT_SYMBOL_GPL(snd_hdac_bus_process_unsol_events); |
d068ebc2 | 176 | |
78dd5e21 TI |
177 | /** |
178 | * snd_hdac_bus_add_device - Add a codec to bus | |
179 | * @bus: HDA core bus | |
180 | * @codec: HDA core device to add | |
181 | * | |
182 | * Adds the given codec to the list in the bus. The caddr_tbl array | |
183 | * and codec_powered bits are updated, as well. | |
184 | * Returns zero if success, or a negative error code. | |
185 | */ | |
d068ebc2 TI |
186 | int snd_hdac_bus_add_device(struct hdac_bus *bus, struct hdac_device *codec) |
187 | { | |
188 | if (bus->caddr_tbl[codec->addr]) { | |
189 | dev_err(bus->dev, "address 0x%x is already occupied\n", | |
190 | codec->addr); | |
191 | return -EBUSY; | |
192 | } | |
193 | ||
194 | list_add_tail(&codec->list, &bus->codec_list); | |
195 | bus->caddr_tbl[codec->addr] = codec; | |
196 | set_bit(codec->addr, &bus->codec_powered); | |
197 | bus->num_codecs++; | |
198 | return 0; | |
199 | } | |
200 | EXPORT_SYMBOL_GPL(snd_hdac_bus_add_device); | |
201 | ||
78dd5e21 TI |
202 | /** |
203 | * snd_hdac_bus_remove_device - Remove a codec from bus | |
204 | * @bus: HDA core bus | |
205 | * @codec: HDA core device to remove | |
206 | */ | |
d068ebc2 TI |
207 | void snd_hdac_bus_remove_device(struct hdac_bus *bus, |
208 | struct hdac_device *codec) | |
209 | { | |
210 | WARN_ON(bus != codec->bus); | |
211 | if (list_empty(&codec->list)) | |
212 | return; | |
213 | list_del_init(&codec->list); | |
214 | bus->caddr_tbl[codec->addr] = NULL; | |
215 | clear_bit(codec->addr, &bus->codec_powered); | |
216 | bus->num_codecs--; | |
eb8d0eaa | 217 | flush_work(&bus->unsol_work); |
d068ebc2 TI |
218 | } |
219 | EXPORT_SYMBOL_GPL(snd_hdac_bus_remove_device); |