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Linux/sound/hda/hdac_bus.c

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

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