blob: 8e262da74f6a4ba24057478938d863e9db278bda [file] [log] [blame]
Takashi Iwaid068ebc2015-03-02 23:22:59 +01001/*
2 * HD-audio core bus driver
3 */
4
5#include <linux/init.h>
6#include <linux/device.h>
7#include <linux/module.h>
8#include <linux/export.h>
9#include <sound/hdaudio.h>
Takashi Iwaie3117822015-03-10 15:16:28 +010010#include "trace.h"
Takashi Iwaid068ebc2015-03-02 23:22:59 +010011
12static void process_unsol_events(struct work_struct *work);
13
14/**
15 * snd_hdac_bus_init - initialize a HD-audio bas bus
16 * @bus: the pointer to bus object
17 *
18 * Returns 0 if successful, or a negative error code.
19 */
20int snd_hdac_bus_init(struct hdac_bus *bus, struct device *dev,
21 const struct hdac_bus_ops *ops)
22{
23 memset(bus, 0, sizeof(*bus));
24 bus->dev = dev;
25 bus->ops = ops;
26 INIT_LIST_HEAD(&bus->codec_list);
27 INIT_WORK(&bus->unsol_work, process_unsol_events);
28 mutex_init(&bus->cmd_mutex);
29 return 0;
30}
31EXPORT_SYMBOL_GPL(snd_hdac_bus_init);
32
33/**
34 * snd_hdac_bus_exit - clean up a HD-audio bas bus
35 * @bus: the pointer to bus object
36 */
37void snd_hdac_bus_exit(struct hdac_bus *bus)
38{
39 WARN_ON(!list_empty(&bus->codec_list));
40 cancel_work_sync(&bus->unsol_work);
41}
42EXPORT_SYMBOL_GPL(snd_hdac_bus_exit);
43
44/**
45 * snd_hdac_bus_exec_verb - execute a HD-audio verb on the given bus
46 * @bus: bus object
47 * @cmd: HD-audio encoded verb
48 * @res: pointer to store the response, NULL if performing asynchronously
49 *
50 * Returns 0 if successful, or a negative error code.
51 */
52int snd_hdac_bus_exec_verb(struct hdac_bus *bus, unsigned int addr,
53 unsigned int cmd, unsigned int *res)
54{
55 int err;
56
57 mutex_lock(&bus->cmd_mutex);
58 err = snd_hdac_bus_exec_verb_unlocked(bus, addr, cmd, res);
59 mutex_unlock(&bus->cmd_mutex);
60 return err;
61}
62EXPORT_SYMBOL_GPL(snd_hdac_bus_exec_verb);
63
64/**
65 * snd_hdac_bus_exec_verb_unlocked - unlocked version
66 * @bus: bus object
67 * @cmd: HD-audio encoded verb
68 * @res: pointer to store the response, NULL if performing asynchronously
69 *
70 * Returns 0 if successful, or a negative error code.
71 */
72int snd_hdac_bus_exec_verb_unlocked(struct hdac_bus *bus, unsigned int addr,
73 unsigned int cmd, unsigned int *res)
74{
75 unsigned int tmp;
76 int err;
77
78 if (cmd == ~0)
79 return -EINVAL;
80
81 if (res)
82 *res = -1;
83 else if (bus->sync_write)
84 res = &tmp;
85 for (;;) {
Takashi Iwaie3117822015-03-10 15:16:28 +010086 trace_hda_send_cmd(bus, cmd);
Takashi Iwaid068ebc2015-03-02 23:22:59 +010087 err = bus->ops->command(bus, cmd);
88 if (err != -EAGAIN)
89 break;
90 /* process pending verbs */
91 err = bus->ops->get_response(bus, addr, &tmp);
92 if (err)
93 break;
94 }
Takashi Iwaie3117822015-03-10 15:16:28 +010095 if (!err && res) {
Takashi Iwaid068ebc2015-03-02 23:22:59 +010096 err = bus->ops->get_response(bus, addr, res);
Takashi Iwaie3117822015-03-10 15:16:28 +010097 trace_hda_get_response(bus, addr, *res);
98 }
Takashi Iwaid068ebc2015-03-02 23:22:59 +010099 return err;
100}
101EXPORT_SYMBOL_GPL(snd_hdac_bus_exec_verb_unlocked);
102
103/**
104 * snd_hdac_bus_queue_event - add an unsolicited event to queue
105 * @bus: the BUS
106 * @res: unsolicited event (lower 32bit of RIRB entry)
107 * @res_ex: codec addr and flags (upper 32bit or RIRB entry)
108 *
109 * Adds the given event to the queue. The events are processed in
110 * the workqueue asynchronously. Call this function in the interrupt
111 * hanlder when RIRB receives an unsolicited event.
112 */
113void snd_hdac_bus_queue_event(struct hdac_bus *bus, u32 res, u32 res_ex)
114{
115 unsigned int wp;
116
117 if (!bus)
118 return;
119
Takashi Iwaie3117822015-03-10 15:16:28 +0100120 trace_hda_unsol_event(bus, res, res_ex);
Takashi Iwaid068ebc2015-03-02 23:22:59 +0100121 wp = (bus->unsol_wp + 1) % HDA_UNSOL_QUEUE_SIZE;
122 bus->unsol_wp = wp;
123
124 wp <<= 1;
125 bus->unsol_queue[wp] = res;
126 bus->unsol_queue[wp + 1] = res_ex;
127
128 schedule_work(&bus->unsol_work);
129}
130EXPORT_SYMBOL_GPL(snd_hdac_bus_queue_event);
131
132/*
133 * process queued unsolicited events
134 */
135static void process_unsol_events(struct work_struct *work)
136{
137 struct hdac_bus *bus = container_of(work, struct hdac_bus, unsol_work);
138 struct hdac_device *codec;
139 struct hdac_driver *drv;
140 unsigned int rp, caddr, res;
141
142 while (bus->unsol_rp != bus->unsol_wp) {
143 rp = (bus->unsol_rp + 1) % HDA_UNSOL_QUEUE_SIZE;
144 bus->unsol_rp = rp;
145 rp <<= 1;
146 res = bus->unsol_queue[rp];
147 caddr = bus->unsol_queue[rp + 1];
148 if (!(caddr & (1 << 4))) /* no unsolicited event? */
149 continue;
150 codec = bus->caddr_tbl[caddr & 0x0f];
151 if (!codec || !codec->dev.driver)
152 continue;
153 drv = drv_to_hdac_driver(codec->dev.driver);
154 if (drv->unsol_event)
155 drv->unsol_event(codec, res);
156 }
157}
158
159int snd_hdac_bus_add_device(struct hdac_bus *bus, struct hdac_device *codec)
160{
161 if (bus->caddr_tbl[codec->addr]) {
162 dev_err(bus->dev, "address 0x%x is already occupied\n",
163 codec->addr);
164 return -EBUSY;
165 }
166
167 list_add_tail(&codec->list, &bus->codec_list);
168 bus->caddr_tbl[codec->addr] = codec;
169 set_bit(codec->addr, &bus->codec_powered);
170 bus->num_codecs++;
171 return 0;
172}
173EXPORT_SYMBOL_GPL(snd_hdac_bus_add_device);
174
175void snd_hdac_bus_remove_device(struct hdac_bus *bus,
176 struct hdac_device *codec)
177{
178 WARN_ON(bus != codec->bus);
179 if (list_empty(&codec->list))
180 return;
181 list_del_init(&codec->list);
182 bus->caddr_tbl[codec->addr] = NULL;
183 clear_bit(codec->addr, &bus->codec_powered);
184 bus->num_codecs--;
185}
186EXPORT_SYMBOL_GPL(snd_hdac_bus_remove_device);