1 /* arch/arm/mach-msm/audio_evrc.c
3 * Copyright (c) 2008 QUALCOMM USA, INC.
5 * This code also borrows from audio_aac.c, which is
6 * Copyright (C) 2008 Google, Inc.
7 * Copyright (C) 2008 HTC Corporation
9 * This software is licensed under the terms of the GNU General Public
10 * License version 2, as published by the Free Software Foundation, and
11 * may be copied, distributed, and modified under those terms.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
17 * See the GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, you can find it at http://www.fsf.org.
22 #include <linux/module.h>
24 #include <linux/miscdevice.h>
25 #include <linux/uaccess.h>
26 #include <linux/kthread.h>
27 #include <linux/wait.h>
28 #include <linux/dma-mapping.h>
29 #include <linux/delay.h>
30 #include <linux/gfp.h>
32 #include <asm/atomic.h>
33 #include <asm/ioctls.h>
34 #include <mach/msm_adsp.h>
35 #include <linux/msm_audio.h>
38 #include <mach/qdsp5/qdsp5audppcmdi.h>
39 #include <mach/qdsp5/qdsp5audppmsg.h>
40 #include <mach/qdsp5/qdsp5audplaycmdi.h>
41 #include <mach/qdsp5/qdsp5audplaymsg.h>
46 #define dprintk(format, arg...) \
47 printk(KERN_DEBUG format, ## arg)
49 #define dprintk(format, arg...) do {} while (0)
52 /* Hold 30 packets of 24 bytes each*/
54 #define DMASZ (BUFSZ * 2)
56 #define AUDDEC_DEC_EVRC 12
58 #define PCM_BUFSZ_MIN 1600 /* 100ms worth of data */
59 #define PCM_BUF_MAX_COUNT 5
60 /* DSP only accepts 5 buffers at most
61 * but support 2 buffers currently
63 #define EVRC_DECODED_FRSZ 320 /* EVRC 20ms 8KHz mono PCM size */
65 #define ROUTING_MODE_FTRT 1
66 #define ROUTING_MODE_RT 2
67 /* Decoder status received from AUDPPTASK */
68 #define AUDPP_DEC_STATUS_SLEEP 0
69 #define AUDPP_DEC_STATUS_INIT 1
70 #define AUDPP_DEC_STATUS_CFG 2
71 #define AUDPP_DEC_STATUS_PLAY 3
76 unsigned used
; /* Input usage actual DSP produced PCM size */
87 uint8_t out_needed
; /* number of buffers the dsp is waiting for */
92 struct mutex write_lock
;
93 wait_queue_head_t write_wait
;
95 /* Host PCM section */
96 struct buffer in
[PCM_BUF_MAX_COUNT
];
97 struct mutex read_lock
;
98 wait_queue_head_t read_wait
; /* Wait queue for read */
99 char *read_data
; /* pointer to reader buffer */
100 dma_addr_t read_phys
; /* physical address of reader buffer */
101 uint8_t read_next
; /* index to input buffers to be read next */
102 uint8_t fill_next
; /* index to buffer that DSP should be filling */
103 uint8_t pcm_buf_count
; /* number of pcm buffer allocated */
104 /* ---- End of Host PCM section */
106 struct msm_adsp_module
*audplay
;
107 struct audmgr audmgr
;
109 /* data allocated for various buffers */
116 uint8_t stopped
:1; /* set when stopped, cleared on flush */
117 uint8_t pcm_feedback
:1;
118 uint8_t buf_refresh
:1;
122 uint32_t read_ptr_offset
;
124 static struct audio the_evrc_audio
;
126 static int auddec_dsp_config(struct audio
*audio
, int enable
);
127 static void audpp_cmd_cfg_adec_params(struct audio
*audio
);
128 static void audpp_cmd_cfg_routing_mode(struct audio
*audio
);
129 static void audevrc_send_data(struct audio
*audio
, unsigned needed
);
130 static void audevrc_dsp_event(void *private, unsigned id
, uint16_t *msg
);
131 static void audevrc_config_hostpcm(struct audio
*audio
);
132 static void audevrc_buffer_refresh(struct audio
*audio
);
134 /* must be called with audio->lock held */
135 static int audevrc_enable(struct audio
*audio
)
137 struct audmgr_config cfg
;
144 audio
->out_needed
= 0;
146 cfg
.tx_rate
= RPC_AUD_DEF_SAMPLE_RATE_NONE
;
147 cfg
.rx_rate
= RPC_AUD_DEF_SAMPLE_RATE_48000
;
148 cfg
.def_method
= RPC_AUD_DEF_METHOD_PLAYBACK
;
149 cfg
.codec
= RPC_AUD_DEF_CODEC_EVRC
;
150 cfg
.snd_method
= RPC_SND_METHOD_MIDI
;
152 rc
= audmgr_enable(&audio
->audmgr
, &cfg
);
156 if (msm_adsp_enable(audio
->audplay
)) {
157 pr_err("audio: msm_adsp_enable(audplay) failed\n");
158 audmgr_disable(&audio
->audmgr
);
162 if (audpp_enable(audio
->dec_id
, audevrc_dsp_event
, audio
)) {
163 pr_err("audio: audpp_enable() failed\n");
164 msm_adsp_disable(audio
->audplay
);
165 audmgr_disable(&audio
->audmgr
);
172 /* must be called with audio->lock held */
173 static int audevrc_disable(struct audio
*audio
)
175 if (audio
->enabled
) {
177 auddec_dsp_config(audio
, 0);
178 wake_up(&audio
->write_wait
);
179 wake_up(&audio
->read_wait
);
180 msm_adsp_disable(audio
->audplay
);
181 audpp_disable(audio
->dec_id
, audio
);
182 audmgr_disable(&audio
->audmgr
);
183 audio
->out_needed
= 0;
188 /* ------------------- dsp --------------------- */
190 static void audevrc_update_pcm_buf_entry(struct audio
*audio
,
196 spin_lock_irqsave(&audio
->dsp_lock
, flags
);
197 for (index
= 0; index
< payload
[1]; index
++) {
198 if (audio
->in
[audio
->fill_next
].addr
199 == payload
[2 + index
* 2]) {
200 dprintk("audevrc_update_pcm_buf_entry: in[%d] ready\n",
202 audio
->in
[audio
->fill_next
].used
=
203 payload
[3 + index
* 2];
204 if ((++audio
->fill_next
) == audio
->pcm_buf_count
)
205 audio
->fill_next
= 0;
209 ("audevrc_update_pcm_buf_entry: expected=%x ret=%x\n",
210 audio
->in
[audio
->fill_next
].addr
,
211 payload
[1 + index
* 2]);
215 if (audio
->in
[audio
->fill_next
].used
== 0) {
216 audevrc_buffer_refresh(audio
);
218 dprintk("audevrc_update_pcm_buf_entry: read cannot keep up\n");
219 audio
->buf_refresh
= 1;
222 spin_unlock_irqrestore(&audio
->dsp_lock
, flags
);
223 wake_up(&audio
->read_wait
);
226 static void audplay_dsp_event(void *data
, unsigned id
, size_t len
,
227 void (*getevent
) (void *ptr
, size_t len
))
229 struct audio
*audio
= data
;
231 getevent(msg
, sizeof(msg
));
233 dprintk("audplay_dsp_event: msg_id=%x\n", id
);
235 case AUDPLAY_MSG_DEC_NEEDS_DATA
:
236 audevrc_send_data(audio
, 1);
238 case AUDPLAY_MSG_BUFFER_UPDATE
:
239 dprintk("audevrc_update_pcm_buf_entry:======> \n");
240 audevrc_update_pcm_buf_entry(audio
, msg
);
243 pr_err("unexpected message from decoder \n");
247 static void audevrc_dsp_event(void *private, unsigned id
, uint16_t *msg
)
249 struct audio
*audio
= private;
252 case AUDPP_MSG_STATUS_MSG
:{
253 unsigned status
= msg
[1];
256 case AUDPP_DEC_STATUS_SLEEP
:
257 dprintk("decoder status: sleep \n");
260 case AUDPP_DEC_STATUS_INIT
:
261 dprintk("decoder status: init \n");
262 audpp_cmd_cfg_routing_mode(audio
);
265 case AUDPP_DEC_STATUS_CFG
:
266 dprintk("decoder status: cfg \n");
268 case AUDPP_DEC_STATUS_PLAY
:
269 dprintk("decoder status: play \n");
270 if (audio
->pcm_feedback
) {
271 audevrc_config_hostpcm(audio
);
272 audevrc_buffer_refresh(audio
);
276 pr_err("unknown decoder status \n");
280 case AUDPP_MSG_CFG_MSG
:
281 if (msg
[0] == AUDPP_MSG_ENA_ENA
) {
282 dprintk("audevrc_dsp_event: CFG_MSG ENABLE\n");
283 auddec_dsp_config(audio
, 1);
284 audio
->out_needed
= 0;
286 audpp_set_volume_and_pan(audio
->dec_id
, audio
->volume
,
288 audpp_avsync(audio
->dec_id
, 22050);
289 } else if (msg
[0] == AUDPP_MSG_ENA_DIS
) {
290 dprintk("audevrc_dsp_event: CFG_MSG DISABLE\n");
291 audpp_avsync(audio
->dec_id
, 0);
294 pr_err("audevrc_dsp_event: CFG_MSG %d?\n", msg
[0]);
297 case AUDPP_MSG_ROUTING_ACK
:
298 dprintk("audevrc_dsp_event: ROUTING_ACK\n");
299 audpp_cmd_cfg_adec_params(audio
);
303 pr_err("audevrc_dsp_event: UNKNOWN (%d)\n", id
);
308 struct msm_adsp_ops audplay_adsp_ops_evrc
= {
309 .event
= audplay_dsp_event
,
312 #define audplay_send_queue0(audio, cmd, len) \
313 msm_adsp_write(audio->audplay, QDSP_uPAudPlay0BitStreamCtrlQueue, \
316 static int auddec_dsp_config(struct audio
*audio
, int enable
)
318 audpp_cmd_cfg_dec_type cmd
;
320 memset(&cmd
, 0, sizeof(cmd
));
321 cmd
.cmd_id
= AUDPP_CMD_CFG_DEC_TYPE
;
323 cmd
.dec0_cfg
= AUDPP_CMD_UPDATDE_CFG_DEC
|
324 AUDPP_CMD_ENA_DEC_V
| AUDDEC_DEC_EVRC
;
326 cmd
.dec0_cfg
= AUDPP_CMD_UPDATDE_CFG_DEC
| AUDPP_CMD_DIS_DEC_V
;
328 return audpp_send_queue1(&cmd
, sizeof(cmd
));
331 static void audpp_cmd_cfg_adec_params(struct audio
*audio
)
333 struct audpp_cmd_cfg_adec_params_evrc cmd
;
335 memset(&cmd
, 0, sizeof(cmd
));
336 cmd
.common
.cmd_id
= AUDPP_CMD_CFG_ADEC_PARAMS
;
337 cmd
.common
.length
= sizeof(cmd
);
338 cmd
.common
.dec_id
= audio
->dec_id
;
339 cmd
.common
.input_sampling_frequency
= 8000;
340 cmd
.stereo_cfg
= AUDPP_CMD_PCM_INTF_MONO_V
;
342 audpp_send_queue2(&cmd
, sizeof(cmd
));
345 static void audpp_cmd_cfg_routing_mode(struct audio
*audio
)
347 struct audpp_cmd_routing_mode cmd
;
348 dprintk("audpp_cmd_cfg_routing_mode()\n");
349 memset(&cmd
, 0, sizeof(cmd
));
350 cmd
.cmd_id
= AUDPP_CMD_ROUTING_MODE
;
351 cmd
.object_number
= audio
->dec_id
;
352 if (audio
->pcm_feedback
)
353 cmd
.routing_mode
= ROUTING_MODE_FTRT
;
355 cmd
.routing_mode
= ROUTING_MODE_RT
;
357 audpp_send_queue1(&cmd
, sizeof(cmd
));
360 static int audplay_dsp_send_data_avail(struct audio
*audio
,
361 unsigned idx
, unsigned len
)
363 audplay_cmd_bitstream_data_avail cmd
;
365 cmd
.cmd_id
= AUDPLAY_CMD_BITSTREAM_DATA_AVAIL
;
366 cmd
.decoder_id
= audio
->dec_id
;
367 cmd
.buf_ptr
= audio
->out
[idx
].addr
;
368 cmd
.buf_size
= len
/ 2;
369 cmd
.partition_number
= 0;
370 return audplay_send_queue0(audio
, &cmd
, sizeof(cmd
));
373 static void audevrc_buffer_refresh(struct audio
*audio
)
375 struct audplay_cmd_buffer_refresh refresh_cmd
;
377 refresh_cmd
.cmd_id
= AUDPLAY_CMD_BUFFER_REFRESH
;
378 refresh_cmd
.num_buffers
= 1;
379 refresh_cmd
.buf0_address
= audio
->in
[audio
->fill_next
].addr
;
380 refresh_cmd
.buf0_length
= audio
->in
[audio
->fill_next
].size
;
382 refresh_cmd
.buf_read_count
= 0;
383 dprintk("audplay_buffer_fresh: buf0_addr=%x buf0_len=%d\n",
384 refresh_cmd
.buf0_address
, refresh_cmd
.buf0_length
);
385 audplay_send_queue0(audio
, &refresh_cmd
, sizeof(refresh_cmd
));
388 static void audevrc_config_hostpcm(struct audio
*audio
)
390 struct audplay_cmd_hpcm_buf_cfg cfg_cmd
;
392 dprintk("audevrc_config_hostpcm()\n");
393 cfg_cmd
.cmd_id
= AUDPLAY_CMD_HPCM_BUF_CFG
;
394 cfg_cmd
.max_buffers
= 1;
395 cfg_cmd
.byte_swap
= 0;
396 cfg_cmd
.hostpcm_config
= (0x8000) | (0x4000);
397 cfg_cmd
.feedback_frequency
= 1;
398 cfg_cmd
.partition_number
= 0;
399 audplay_send_queue0(audio
, &cfg_cmd
, sizeof(cfg_cmd
));
403 static void audevrc_send_data(struct audio
*audio
, unsigned needed
)
405 struct buffer
*frame
;
408 spin_lock_irqsave(&audio
->dsp_lock
, flags
);
413 /* We were called from the callback because the DSP
414 * requested more data. Note that the DSP does want
415 * more data, and if a buffer was in-flight, mark it
416 * as available (since the DSP must now be done with
419 audio
->out_needed
= 1;
420 frame
= audio
->out
+ audio
->out_tail
;
421 if (frame
->used
== 0xffffffff) {
422 dprintk("frame %d free\n", audio
->out_tail
);
424 audio
->out_tail
^= 1;
425 wake_up(&audio
->write_wait
);
429 if (audio
->out_needed
) {
430 /* If the DSP currently wants data and we have a
431 * buffer available, we will send it and reset
432 * the needed flag. We'll mark the buffer as in-flight
433 * so that it won't be recycled until the next buffer
437 frame
= audio
->out
+ audio
->out_tail
;
439 BUG_ON(frame
->used
== 0xffffffff);
440 dprintk("frame %d busy\n", audio
->out_tail
);
441 audplay_dsp_send_data_avail(audio
, audio
->out_tail
,
443 frame
->used
= 0xffffffff;
444 audio
->out_needed
= 0;
448 spin_unlock_irqrestore(&audio
->dsp_lock
, flags
);
451 /* ------------------- device --------------------- */
453 static void audevrc_flush(struct audio
*audio
)
455 audio
->out
[0].used
= 0;
456 audio
->out
[1].used
= 0;
460 atomic_set(&audio
->out_bytes
, 0);
463 static void audevrc_flush_pcm_buf(struct audio
*audio
)
467 for (index
= 0; index
< PCM_BUF_MAX_COUNT
; index
++)
468 audio
->in
[index
].used
= 0;
470 audio
->read_next
= 0;
471 audio
->fill_next
= 0;
474 static long audevrc_ioctl(struct file
*file
, unsigned int cmd
,
477 struct audio
*audio
= file
->private_data
;
480 dprintk("audevrc_ioctl() cmd = %d\n", cmd
);
482 if (cmd
== AUDIO_GET_STATS
) {
483 struct msm_audio_stats stats
;
484 stats
.byte_count
= audpp_avsync_byte_count(audio
->dec_id
);
485 stats
.sample_count
= audpp_avsync_sample_count(audio
->dec_id
);
486 if (copy_to_user((void *)arg
, &stats
, sizeof(stats
)))
490 if (cmd
== AUDIO_SET_VOLUME
) {
492 spin_lock_irqsave(&audio
->dsp_lock
, flags
);
495 audpp_set_volume_and_pan(audio
->dec_id
, arg
, 0);
496 spin_unlock_irqrestore(&audio
->dsp_lock
, flags
);
499 mutex_lock(&audio
->lock
);
502 rc
= audevrc_enable(audio
);
505 rc
= audevrc_disable(audio
);
508 case AUDIO_SET_CONFIG
:{
509 dprintk("AUDIO_SET_CONFIG not applicable \n");
512 case AUDIO_GET_CONFIG
:{
513 struct msm_audio_config config
;
514 config
.buffer_size
= BUFSZ
;
515 config
.buffer_count
= 2;
516 config
.sample_rate
= 8000;
517 config
.channel_count
= 1;
518 config
.unused
[0] = 0;
519 config
.unused
[1] = 0;
520 config
.unused
[2] = 0;
521 config
.unused
[3] = 0;
522 if (copy_to_user((void *)arg
, &config
, sizeof(config
)))
528 case AUDIO_GET_PCM_CONFIG
:{
529 struct msm_audio_pcm_config config
;
530 config
.pcm_feedback
= 0;
531 config
.buffer_count
= PCM_BUF_MAX_COUNT
;
532 config
.buffer_size
= PCM_BUFSZ_MIN
;
533 if (copy_to_user((void *)arg
, &config
, sizeof(config
)))
539 case AUDIO_SET_PCM_CONFIG
:{
540 struct msm_audio_pcm_config config
;
542 (&config
, (void *)arg
, sizeof(config
))) {
546 if ((config
.buffer_count
> PCM_BUF_MAX_COUNT
) ||
547 (config
.buffer_count
== 1))
548 config
.buffer_count
= PCM_BUF_MAX_COUNT
;
550 if (config
.buffer_size
< PCM_BUFSZ_MIN
)
551 config
.buffer_size
= PCM_BUFSZ_MIN
;
553 /* Check if pcm feedback is required */
554 if ((config
.pcm_feedback
) && (!audio
->read_data
)) {
555 dprintk("audevrc_ioctl: allocate PCM buf %d\n",
556 config
.buffer_count
*
559 dma_alloc_coherent(NULL
,
564 if (!audio
->read_data
) {
566 ("audevrc_ioctl: no mem for pcm buf\n");
571 audio
->pcm_feedback
= 1;
572 audio
->buf_refresh
= 0;
573 audio
->pcm_buf_count
=
575 audio
->read_next
= 0;
576 audio
->fill_next
= 0;
579 index
< config
.buffer_count
;
581 audio
->in
[index
].data
=
582 audio
->read_data
+ offset
;
583 audio
->in
[index
].addr
=
584 audio
->read_phys
+ offset
;
585 audio
->in
[index
].size
=
587 audio
->in
[index
].used
= 0;
588 offset
+= config
.buffer_size
;
598 dprintk("%s: AUDIO_PAUSE %ld\n", __func__
, arg
);
599 rc
= audpp_pause(audio
->dec_id
, (int) arg
);
604 mutex_unlock(&audio
->lock
);
608 static ssize_t
audevrc_read(struct file
*file
, char __user
*buf
, size_t count
,
611 struct audio
*audio
= file
->private_data
;
612 const char __user
*start
= buf
;
614 if (!audio
->pcm_feedback
) {
616 /* PCM feedback is not enabled. Nothing to read */
618 mutex_lock(&audio
->read_lock
);
619 dprintk("audevrc_read() \n");
621 rc
= wait_event_interruptible(audio
->read_wait
,
622 (audio
->in
[audio
->read_next
].
623 used
> 0) || (audio
->stopped
));
624 dprintk("audevrc_read() wait terminated \n");
627 if (audio
->stopped
) {
631 if (count
< audio
->in
[audio
->read_next
].used
) {
632 /* Read must happen in frame boundary. Since driver does
633 * not know frame size, read count must be greater or
634 * equal to size of PCM samples
636 dprintk("audevrc_read:read stop - partial frame\n");
639 dprintk("audevrc_read: read from in[%d]\n",
642 (buf
, audio
->in
[audio
->read_next
].data
,
643 audio
->in
[audio
->read_next
].used
)) {
644 pr_err("audevrc_read: invalid addr %x \n",
649 count
-= audio
->in
[audio
->read_next
].used
;
650 buf
+= audio
->in
[audio
->read_next
].used
;
651 audio
->in
[audio
->read_next
].used
= 0;
652 if ((++audio
->read_next
) == audio
->pcm_buf_count
)
653 audio
->read_next
= 0;
654 if (audio
->in
[audio
->read_next
].used
== 0)
655 break; /* No data ready at this moment
656 * Exit while loop to prevent
657 * output thread sleep too long
662 if (audio
->buf_refresh
) {
663 audio
->buf_refresh
= 0;
664 dprintk("audevrc_read: kick start pcm feedback again\n");
665 audevrc_buffer_refresh(audio
);
667 mutex_unlock(&audio
->read_lock
);
670 dprintk("audevrc_read: read %d bytes\n", rc
);
674 static ssize_t
audevrc_write(struct file
*file
, const char __user
*buf
,
675 size_t count
, loff_t
*pos
)
677 struct audio
*audio
= file
->private_data
;
678 const char __user
*start
= buf
;
679 struct buffer
*frame
;
685 mutex_lock(&audio
->write_lock
);
686 dprintk("audevrc_write() \n");
688 frame
= audio
->out
+ audio
->out_head
;
689 rc
= wait_event_interruptible(audio
->write_wait
,
691 || (audio
->stopped
));
694 if (audio
->stopped
) {
698 xfer
= (count
> frame
->size
) ? frame
->size
: count
;
699 if (copy_from_user(frame
->data
, buf
, xfer
)) {
705 audio
->out_head
^= 1;
709 audevrc_send_data(audio
, 0);
712 mutex_unlock(&audio
->write_lock
);
718 static int audevrc_release(struct inode
*inode
, struct file
*file
)
720 struct audio
*audio
= file
->private_data
;
722 dprintk("audevrc_release()\n");
724 mutex_lock(&audio
->lock
);
725 audevrc_disable(audio
);
726 audevrc_flush(audio
);
727 audevrc_flush_pcm_buf(audio
);
728 msm_adsp_put(audio
->audplay
);
729 audio
->audplay
= NULL
;
731 dma_free_coherent(NULL
, DMASZ
, audio
->data
, audio
->phys
);
733 if (audio
->read_data
!= NULL
) {
734 dma_free_coherent(NULL
,
735 audio
->in
[0].size
* audio
->pcm_buf_count
,
736 audio
->read_data
, audio
->read_phys
);
737 audio
->read_data
= NULL
;
739 audio
->pcm_feedback
= 0;
740 mutex_unlock(&audio
->lock
);
744 static struct audio the_evrc_audio
;
746 static int audevrc_open(struct inode
*inode
, struct file
*file
)
748 struct audio
*audio
= &the_evrc_audio
;
752 pr_err("audio: busy\n");
757 mutex_lock(&audio
->lock
);
760 audio
->data
= dma_alloc_coherent(NULL
, DMASZ
,
761 &audio
->phys
, GFP_KERNEL
);
763 pr_err("audio: could not allocate DMA buffers\n");
769 rc
= audmgr_open(&audio
->audmgr
);
773 rc
= msm_adsp_get("AUDPLAY0TASK", &audio
->audplay
,
774 &audplay_adsp_ops_evrc
, audio
);
776 pr_err("audio: failed to get audplay0 dsp module\n");
782 audio
->out
[0].data
= audio
->data
+ 0;
783 audio
->out
[0].addr
= audio
->phys
+ 0;
784 audio
->out
[0].size
= BUFSZ
;
786 audio
->out
[1].data
= audio
->data
+ BUFSZ
;
787 audio
->out
[1].addr
= audio
->phys
+ BUFSZ
;
788 audio
->out
[1].size
= BUFSZ
;
790 audio
->volume
= 0x3FFF;
792 audevrc_flush(audio
);
795 file
->private_data
= audio
;
797 mutex_unlock(&audio
->lock
);
801 audmgr_close(&audio
->audmgr
);
803 dma_free_coherent(NULL
, DMASZ
, audio
->data
, audio
->phys
);
805 mutex_unlock(&audio
->lock
);
809 static struct file_operations audio_evrc_fops
= {
810 .owner
= THIS_MODULE
,
811 .open
= audevrc_open
,
812 .release
= audevrc_release
,
813 .read
= audevrc_read
,
814 .write
= audevrc_write
,
815 .unlocked_ioctl
= audevrc_ioctl
,
816 .llseek
= noop_llseek
,
819 struct miscdevice audio_evrc_misc
= {
820 .minor
= MISC_DYNAMIC_MINOR
,
822 .fops
= &audio_evrc_fops
,
825 static int __init
audevrc_init(void)
827 mutex_init(&the_evrc_audio
.lock
);
828 mutex_init(&the_evrc_audio
.write_lock
);
829 mutex_init(&the_evrc_audio
.read_lock
);
830 spin_lock_init(&the_evrc_audio
.dsp_lock
);
831 init_waitqueue_head(&the_evrc_audio
.write_wait
);
832 init_waitqueue_head(&the_evrc_audio
.read_wait
);
833 the_evrc_audio
.read_data
= NULL
;
834 return misc_register(&audio_evrc_misc
);
837 static void __exit
audevrc_exit(void)
839 misc_deregister(&audio_evrc_misc
);
842 module_init(audevrc_init
);
843 module_exit(audevrc_exit
);
845 MODULE_DESCRIPTION("MSM EVRC driver");
846 MODULE_LICENSE("GPL v2");
847 MODULE_AUTHOR("QUALCOMM Inc");