1 /* linux/arch/arm/mach-msm/qdsp5/audio_amrnb.c
3 * amrnb audio decoder device
5 * Copyright (c) 2008 QUALCOMM USA, INC.
7 * Based on the mp3 native driver in arch/arm/mach-msm/qdsp5/audio_mp3.c
9 * Copyright (C) 2008 Google, Inc.
10 * Copyright (C) 2008 HTC Corporation
12 * All source code in this file is licensed under the following license except
15 * This program is free software; you can redistribute it and/or modify it
16 * under the terms of the GNU General Public License version 2 as published
17 * by the Free Software Foundation.
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
23 * See the GNU General Public License for more details.
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, you can find it at http://www.fsf.org
28 #include <linux/module.h>
30 #include <linux/miscdevice.h>
31 #include <linux/uaccess.h>
32 #include <linux/kthread.h>
33 #include <linux/wait.h>
34 #include <linux/dma-mapping.h>
36 #include <linux/delay.h>
38 #include <asm/atomic.h>
39 #include <asm/ioctls.h>
40 #include <mach/msm_adsp.h>
41 #include <linux/msm_audio.h>
44 #include <mach/qdsp5/qdsp5audppcmdi.h>
45 #include <mach/qdsp5/qdsp5audppmsg.h>
46 #include <mach/qdsp5/qdsp5audplaycmdi.h>
47 #include <mach/qdsp5/qdsp5audplaymsg.h>
49 /* for queue ids - should be relative to module number*/
54 #define dprintk(format, arg...) \
55 printk(KERN_DEBUG format, ## arg)
57 #define dprintk(format, arg...) do {} while (0)
60 #define BUFSZ 1024 /* Hold minimum 700ms voice data */
61 #define DMASZ (BUFSZ * 2)
63 #define AUDPLAY_INVALID_READ_PTR_OFFSET 0xFFFF
64 #define AUDDEC_DEC_AMRNB 10
66 #define PCM_BUFSZ_MIN 1600 /* 100ms worth of data */
67 #define AMRNB_DECODED_FRSZ 320 /* AMR-NB 20ms 8KHz mono PCM size */
68 #define PCM_BUF_MAX_COUNT 5 /* DSP only accepts 5 buffers at most
69 but support 2 buffers currently */
70 #define ROUTING_MODE_FTRT 1
71 #define ROUTING_MODE_RT 2
72 /* Decoder status received from AUDPPTASK */
73 #define AUDPP_DEC_STATUS_SLEEP 0
74 #define AUDPP_DEC_STATUS_INIT 1
75 #define AUDPP_DEC_STATUS_CFG 2
76 #define AUDPP_DEC_STATUS_PLAY 3
81 unsigned used; /* Input usage actual DSP produced PCM size */
92 uint8_t out_needed; /* number of buffers the dsp is waiting for */
97 struct mutex write_lock;
98 wait_queue_head_t write_wait;
100 /* Host PCM section */
101 struct buffer in[PCM_BUF_MAX_COUNT];
102 struct mutex read_lock;
103 wait_queue_head_t read_wait; /* Wait queue for read */
104 char *read_data; /* pointer to reader buffer */
105 dma_addr_t read_phys; /* physical address of reader buffer */
106 uint8_t read_next; /* index to input buffers to be read next */
107 uint8_t fill_next; /* index to buffer that DSP should be filling */
108 uint8_t pcm_buf_count; /* number of pcm buffer allocated */
109 /* ---- End of Host PCM section */
111 struct msm_adsp_module *audplay;
113 struct audmgr audmgr;
115 /* data allocated for various buffers */
122 uint8_t stopped:1; /* set when stopped, cleared on flush */
123 uint8_t pcm_feedback:1;
124 uint8_t buf_refresh:1;
129 uint32_t read_ptr_offset;
132 struct audpp_cmd_cfg_adec_params_amrnb {
133 audpp_cmd_cfg_adec_params_common common;
134 unsigned short stereo_cfg;
135 } __attribute__((packed)) ;
137 static int auddec_dsp_config(struct audio *audio, int enable);
138 static void audpp_cmd_cfg_adec_params(struct audio *audio);
139 static void audpp_cmd_cfg_routing_mode(struct audio *audio);
140 static void audamrnb_send_data(struct audio *audio, unsigned needed);
141 static void audamrnb_config_hostpcm(struct audio *audio);
142 static void audamrnb_buffer_refresh(struct audio *audio);
143 static void audamrnb_dsp_event(void *private, unsigned id, uint16_t *msg);
145 /* must be called with audio->lock held */
146 static int audamrnb_enable(struct audio *audio)
148 struct audmgr_config cfg;
151 dprintk("audamrnb_enable()\n");
157 audio->out_needed = 0;
159 cfg.tx_rate = RPC_AUD_DEF_SAMPLE_RATE_NONE;
160 cfg.rx_rate = RPC_AUD_DEF_SAMPLE_RATE_48000;
161 cfg.def_method = RPC_AUD_DEF_METHOD_PLAYBACK;
162 cfg.codec = RPC_AUD_DEF_CODEC_AMR_NB;
163 cfg.snd_method = RPC_SND_METHOD_MIDI;
165 rc = audmgr_enable(&audio->audmgr, &cfg);
169 if (msm_adsp_enable(audio->audplay)) {
170 pr_err("audio: msm_adsp_enable(audplay) failed\n");
171 audmgr_disable(&audio->audmgr);
175 if (audpp_enable(audio->dec_id, audamrnb_dsp_event, audio)) {
176 pr_err("audio: audpp_enable() failed\n");
177 msm_adsp_disable(audio->audplay);
178 audmgr_disable(&audio->audmgr);
185 /* must be called with audio->lock held */
186 static int audamrnb_disable(struct audio *audio)
188 dprintk("audamrnb_disable()\n");
189 if (audio->enabled) {
191 auddec_dsp_config(audio, 0);
192 wake_up(&audio->write_wait);
193 wake_up(&audio->read_wait);
194 msm_adsp_disable(audio->audplay);
195 audpp_disable(audio->dec_id, audio);
196 audmgr_disable(&audio->audmgr);
197 audio->out_needed = 0;
202 /* ------------------- dsp --------------------- */
203 static void audamrnb_update_pcm_buf_entry(struct audio *audio,
209 spin_lock_irqsave(&audio->dsp_lock, flags);
210 for (index = 0; index < payload[1]; index++) {
211 if (audio->in[audio->fill_next].addr ==
212 payload[2 + index * 2]) {
213 dprintk("audamrnb_update_pcm_buf_entry: in[%d] ready\n",
215 audio->in[audio->fill_next].used =
216 payload[3 + index * 2];
217 if ((++audio->fill_next) == audio->pcm_buf_count)
218 audio->fill_next = 0;
222 ("audamrnb_update_pcm_buf_entry: expected=%x ret=%x\n"
223 , audio->in[audio->fill_next].addr,
224 payload[1 + index * 2]);
228 if (audio->in[audio->fill_next].used == 0) {
229 audamrnb_buffer_refresh(audio);
231 dprintk("audamrnb_update_pcm_buf_entry: read cannot keep up\n");
232 audio->buf_refresh = 1;
235 spin_unlock_irqrestore(&audio->dsp_lock, flags);
236 wake_up(&audio->read_wait);
239 static void audplay_dsp_event(void *data, unsigned id, size_t len,
240 void (*getevent) (void *ptr, size_t len))
242 struct audio *audio = data;
244 getevent(msg, sizeof(msg));
246 dprintk("audplay_dsp_event: msg_id=%x\n", id);
249 case AUDPLAY_MSG_DEC_NEEDS_DATA:
250 audamrnb_send_data(audio, 1);
253 case AUDPLAY_MSG_BUFFER_UPDATE:
254 audamrnb_update_pcm_buf_entry(audio, msg);
258 pr_err("unexpected message from decoder \n");
262 static void audamrnb_dsp_event(void *private, unsigned id, uint16_t *msg)
264 struct audio *audio = private;
267 case AUDPP_MSG_STATUS_MSG:{
268 unsigned status = msg[1];
271 case AUDPP_DEC_STATUS_SLEEP:
272 dprintk("decoder status: sleep \n");
275 case AUDPP_DEC_STATUS_INIT:
276 dprintk("decoder status: init \n");
277 audpp_cmd_cfg_routing_mode(audio);
280 case AUDPP_DEC_STATUS_CFG:
281 dprintk("decoder status: cfg \n");
283 case AUDPP_DEC_STATUS_PLAY:
284 dprintk("decoder status: play \n");
285 if (audio->pcm_feedback) {
286 audamrnb_config_hostpcm(audio);
287 audamrnb_buffer_refresh(audio);
291 pr_err("unknown decoder status \n");
296 case AUDPP_MSG_CFG_MSG:
297 if (msg[0] == AUDPP_MSG_ENA_ENA) {
298 dprintk("audamrnb_dsp_event: CFG_MSG ENABLE\n");
299 auddec_dsp_config(audio, 1);
300 audio->out_needed = 0;
302 audpp_set_volume_and_pan(audio->dec_id, audio->volume,
304 audpp_avsync(audio->dec_id, 22050);
305 } else if (msg[0] == AUDPP_MSG_ENA_DIS) {
306 dprintk("audamrnb_dsp_event: CFG_MSG DISABLE\n");
307 audpp_avsync(audio->dec_id, 0);
310 pr_err("audamrnb_dsp_event: CFG_MSG %d?\n", msg[0]);
313 case AUDPP_MSG_ROUTING_ACK:
314 dprintk("audamrnb_dsp_event: ROUTING_ACK mode=%d\n", msg[1]);
315 audpp_cmd_cfg_adec_params(audio);
319 pr_err("audamrnb_dsp_event: UNKNOWN (%d)\n", id);
324 struct msm_adsp_ops audplay_adsp_ops_amrnb = {
325 .event = audplay_dsp_event,
328 #define audplay_send_queue0(audio, cmd, len) \
329 msm_adsp_write(audio->audplay, QDSP_uPAudPlay0BitStreamCtrlQueue, \
332 static int auddec_dsp_config(struct audio *audio, int enable)
334 audpp_cmd_cfg_dec_type cmd;
336 memset(&cmd, 0, sizeof(cmd));
337 cmd.cmd_id = AUDPP_CMD_CFG_DEC_TYPE;
339 cmd.dec0_cfg = AUDPP_CMD_UPDATDE_CFG_DEC |
340 AUDPP_CMD_ENA_DEC_V | AUDDEC_DEC_AMRNB;
342 cmd.dec0_cfg = AUDPP_CMD_UPDATDE_CFG_DEC | AUDPP_CMD_DIS_DEC_V;
344 return audpp_send_queue1(&cmd, sizeof(cmd));
347 static void audpp_cmd_cfg_adec_params(struct audio *audio)
349 struct audpp_cmd_cfg_adec_params_amrnb cmd;
351 memset(&cmd, 0, sizeof(cmd));
352 cmd.common.cmd_id = AUDPP_CMD_CFG_ADEC_PARAMS;
353 cmd.common.length = AUDPP_CMD_CFG_ADEC_PARAMS_V13K_LEN;
354 cmd.common.dec_id = audio->dec_id;
355 cmd.common.input_sampling_frequency = 8000;
356 cmd.stereo_cfg = AUDPP_CMD_PCM_INTF_MONO_V;
358 audpp_send_queue2(&cmd, sizeof(cmd));
361 static void audpp_cmd_cfg_routing_mode(struct audio *audio)
363 struct audpp_cmd_routing_mode cmd;
364 dprintk("audpp_cmd_cfg_routing_mode()\n");
365 memset(&cmd, 0, sizeof(cmd));
366 cmd.cmd_id = AUDPP_CMD_ROUTING_MODE;
367 cmd.object_number = audio->dec_id;
368 if (audio->pcm_feedback)
369 cmd.routing_mode = ROUTING_MODE_FTRT;
371 cmd.routing_mode = ROUTING_MODE_RT;
373 audpp_send_queue1(&cmd, sizeof(cmd));
376 static int audplay_dsp_send_data_avail(struct audio *audio,
377 unsigned idx, unsigned len)
379 audplay_cmd_bitstream_data_avail cmd;
381 cmd.cmd_id = AUDPLAY_CMD_BITSTREAM_DATA_AVAIL;
382 cmd.decoder_id = audio->dec_id;
383 cmd.buf_ptr = audio->out[idx].addr;
384 cmd.buf_size = len / 2;
385 cmd.partition_number = 0;
386 return audplay_send_queue0(audio, &cmd, sizeof(cmd));
389 static void audamrnb_buffer_refresh(struct audio *audio)
391 struct audplay_cmd_buffer_refresh refresh_cmd;
393 refresh_cmd.cmd_id = AUDPLAY_CMD_BUFFER_REFRESH;
394 refresh_cmd.num_buffers = 1;
395 refresh_cmd.buf0_address = audio->in[audio->fill_next].addr;
396 refresh_cmd.buf0_length = audio->in[audio->fill_next].size -
397 (audio->in[audio->fill_next].size % AMRNB_DECODED_FRSZ);
398 refresh_cmd.buf_read_count = 0;
399 dprintk("audplay_buffer_fresh: buf0_addr=%x buf0_len=%d\n",
400 refresh_cmd.buf0_address, refresh_cmd.buf0_length);
401 (void)audplay_send_queue0(audio, &refresh_cmd, sizeof(refresh_cmd));
404 static void audamrnb_config_hostpcm(struct audio *audio)
406 struct audplay_cmd_hpcm_buf_cfg cfg_cmd;
408 dprintk("audamrnb_config_hostpcm()\n");
409 cfg_cmd.cmd_id = AUDPLAY_CMD_HPCM_BUF_CFG;
410 cfg_cmd.max_buffers = audio->pcm_buf_count;
411 cfg_cmd.byte_swap = 0;
412 cfg_cmd.hostpcm_config = (0x8000) | (0x4000);
413 cfg_cmd.feedback_frequency = 1;
414 cfg_cmd.partition_number = 0;
415 (void)audplay_send_queue0(audio, &cfg_cmd, sizeof(cfg_cmd));
419 static void audamrnb_send_data(struct audio *audio, unsigned needed)
421 struct buffer *frame;
424 spin_lock_irqsave(&audio->dsp_lock, flags);
429 /* We were called from the callback because the DSP
430 * requested more data. Note that the DSP does want
431 * more data, and if a buffer was in-flight, mark it
432 * as available (since the DSP must now be done with
435 audio->out_needed = 1;
436 frame = audio->out + audio->out_tail;
437 if (frame->used == 0xffffffff) {
439 audio->out_tail ^= 1;
440 wake_up(&audio->write_wait);
444 if (audio->out_needed) {
445 /* If the DSP currently wants data and we have a
446 * buffer available, we will send it and reset
447 * the needed flag. We'll mark the buffer as in-flight
448 * so that it won't be recycled until the next buffer
452 frame = audio->out + audio->out_tail;
454 BUG_ON(frame->used == 0xffffffff);
455 /* printk("frame %d busy\n", audio->out_tail); */
456 audplay_dsp_send_data_avail(audio, audio->out_tail,
458 frame->used = 0xffffffff;
459 audio->out_needed = 0;
463 spin_unlock_irqrestore(&audio->dsp_lock, flags);
466 /* ------------------- device --------------------- */
468 static void audamrnb_flush(struct audio *audio)
470 audio->out[0].used = 0;
471 audio->out[1].used = 0;
475 atomic_set(&audio->out_bytes, 0);
478 static void audamrnb_flush_pcm_buf(struct audio *audio)
482 for (index = 0; index < PCM_BUF_MAX_COUNT; index++)
483 audio->in[index].used = 0;
485 audio->read_next = 0;
486 audio->fill_next = 0;
489 static long audamrnb_ioctl(struct file *file, unsigned int cmd,
492 struct audio *audio = file->private_data;
495 dprintk("audamrnb_ioctl() cmd = %d\n", cmd);
497 if (cmd == AUDIO_GET_STATS) {
498 struct msm_audio_stats stats;
499 stats.byte_count = audpp_avsync_byte_count(audio->dec_id);
500 stats.sample_count = audpp_avsync_sample_count(audio->dec_id);
501 if (copy_to_user((void *)arg, &stats, sizeof(stats)))
505 if (cmd == AUDIO_SET_VOLUME) {
507 spin_lock_irqsave(&audio->dsp_lock, flags);
510 audpp_set_volume_and_pan(audio->dec_id, arg, 0);
511 spin_unlock_irqrestore(&audio->dsp_lock, flags);
514 mutex_lock(&audio->lock);
517 rc = audamrnb_enable(audio);
520 rc = audamrnb_disable(audio);
524 if (audio->stopped) {
525 /* Make sure we're stopped and we wake any threads
526 * that might be blocked holding the write_lock.
527 * While audio->stopped write threads will always
530 wake_up(&audio->write_wait);
531 mutex_lock(&audio->write_lock);
532 audamrnb_flush(audio);
533 mutex_unlock(&audio->write_lock);
534 wake_up(&audio->read_wait);
535 mutex_lock(&audio->read_lock);
536 audamrnb_flush_pcm_buf(audio);
537 mutex_unlock(&audio->read_lock);
541 case AUDIO_SET_CONFIG:{
542 dprintk("AUDIO_SET_CONFIG not applicable \n");
545 case AUDIO_GET_CONFIG:{
546 struct msm_audio_config config;
547 config.buffer_size = BUFSZ;
548 config.buffer_count = 2;
549 config.sample_rate = 8000;
550 config.channel_count = 1;
551 config.unused[0] = 0;
552 config.unused[1] = 0;
553 config.unused[2] = 0;
554 config.unused[3] = 0;
555 if (copy_to_user((void *)arg, &config,
563 case AUDIO_GET_PCM_CONFIG:{
564 struct msm_audio_pcm_config config;
565 config.pcm_feedback = 0;
566 config.buffer_count = PCM_BUF_MAX_COUNT;
567 config.buffer_size = PCM_BUFSZ_MIN;
568 if (copy_to_user((void *)arg, &config,
575 case AUDIO_SET_PCM_CONFIG:{
576 struct msm_audio_pcm_config config;
578 (&config, (void *)arg, sizeof(config))) {
582 if ((config.buffer_count > PCM_BUF_MAX_COUNT) ||
583 (config.buffer_count == 1))
584 config.buffer_count = PCM_BUF_MAX_COUNT;
586 if (config.buffer_size < PCM_BUFSZ_MIN)
587 config.buffer_size = PCM_BUFSZ_MIN;
589 /* Check if pcm feedback is required */
590 if ((config.pcm_feedback) && (!audio->read_data)) {
591 dprintk("audamrnb_ioctl: allocate PCM buf %d\n",
592 config.buffer_count *
595 dma_alloc_coherent(NULL,
600 if (!audio->read_data) {
601 pr_err("audamrnb_ioctl: no mem for pcm buf\n");
606 audio->pcm_feedback = 1;
607 audio->buf_refresh = 0;
608 audio->pcm_buf_count =
610 audio->read_next = 0;
611 audio->fill_next = 0;
614 index < config.buffer_count; index++) {
615 audio->in[index].data =
616 audio->read_data + offset;
617 audio->in[index].addr =
618 audio->read_phys + offset;
619 audio->in[index].size =
621 audio->in[index].used = 0;
622 offset += config.buffer_size;
634 mutex_unlock(&audio->lock);
638 static ssize_t audamrnb_read(struct file *file, char __user *buf, size_t count,
641 struct audio *audio = file->private_data;
642 const char __user *start = buf;
645 if (!audio->pcm_feedback)
646 return 0; /* PCM feedback is not enabled. Nothing to read */
648 mutex_lock(&audio->read_lock);
649 dprintk("audamrnb_read() %d \n", count);
651 rc = wait_event_interruptible(audio->read_wait,
652 (audio->in[audio->read_next].
653 used > 0) || (audio->stopped));
658 if (audio->stopped) {
663 if (count < audio->in[audio->read_next].used) {
664 /* Read must happen in frame boundary. Since driver does
665 * not know frame size, read count must be greater or
666 * equal to size of PCM samples
668 dprintk("audamrnb_read:read stop - partial frame\n");
671 dprintk("audamrnb_read: read from in[%d]\n",
674 (buf, audio->in[audio->read_next].data,
675 audio->in[audio->read_next].used)) {
676 pr_err("audamrnb_read: invalid addr %x \n",
681 count -= audio->in[audio->read_next].used;
682 buf += audio->in[audio->read_next].used;
683 audio->in[audio->read_next].used = 0;
684 if ((++audio->read_next) == audio->pcm_buf_count)
685 audio->read_next = 0;
689 if (audio->buf_refresh) {
690 audio->buf_refresh = 0;
691 dprintk("audamrnb_read: kick start pcm feedback again\n");
692 audamrnb_buffer_refresh(audio);
695 mutex_unlock(&audio->read_lock);
700 dprintk("audamrnb_read: read %d bytes\n", rc);
704 static ssize_t audamrnb_write(struct file *file, const char __user *buf,
705 size_t count, loff_t *pos)
707 struct audio *audio = file->private_data;
708 const char __user *start = buf;
709 struct buffer *frame;
715 dprintk("audamrnb_write() \n");
716 mutex_lock(&audio->write_lock);
718 frame = audio->out + audio->out_head;
719 rc = wait_event_interruptible(audio->write_wait,
721 || (audio->stopped));
722 dprintk("audamrnb_write() buffer available\n");
725 if (audio->stopped) {
729 xfer = (count > frame->size) ? frame->size : count;
730 if (copy_from_user(frame->data, buf, xfer)) {
736 audio->out_head ^= 1;
740 audamrnb_send_data(audio, 0);
743 mutex_unlock(&audio->write_lock);
749 static int audamrnb_release(struct inode *inode, struct file *file)
751 struct audio *audio = file->private_data;
753 dprintk("audamrnb_release()\n");
755 mutex_lock(&audio->lock);
756 audamrnb_disable(audio);
757 audamrnb_flush(audio);
758 audamrnb_flush_pcm_buf(audio);
759 msm_adsp_put(audio->audplay);
760 audio->audplay = NULL;
762 dma_free_coherent(NULL, DMASZ, audio->data, audio->phys);
764 if (audio->read_data != NULL) {
765 dma_free_coherent(NULL,
766 audio->in[0].size * audio->pcm_buf_count,
767 audio->read_data, audio->read_phys);
768 audio->read_data = NULL;
770 audio->pcm_feedback = 0;
771 mutex_unlock(&audio->lock);
775 static struct audio the_amrnb_audio;
777 static int audamrnb_open(struct inode *inode, struct file *file)
779 struct audio *audio = &the_amrnb_audio;
782 mutex_lock(&audio->lock);
785 pr_err("audio: busy\n");
791 audio->data = dma_alloc_coherent(NULL, DMASZ,
792 &audio->phys, GFP_KERNEL);
794 pr_err("audio: could not allocate DMA buffers\n");
800 rc = audmgr_open(&audio->audmgr);
804 rc = msm_adsp_get("AUDPLAY0TASK", &audio->audplay,
805 &audplay_adsp_ops_amrnb, audio);
807 pr_err("audio: failed to get audplay0 dsp module\n");
808 audmgr_disable(&audio->audmgr);
809 dma_free_coherent(NULL, DMASZ, audio->data, audio->phys);
816 audio->out[0].data = audio->data + 0;
817 audio->out[0].addr = audio->phys + 0;
818 audio->out[0].size = BUFSZ;
820 audio->out[1].data = audio->data + BUFSZ;
821 audio->out[1].addr = audio->phys + BUFSZ;
822 audio->out[1].size = BUFSZ;
824 audio->volume = 0x2000; /* Q13 1.0 */
826 audamrnb_flush(audio);
828 file->private_data = audio;
832 mutex_unlock(&audio->lock);
836 static struct file_operations audio_amrnb_fops = {
837 .owner = THIS_MODULE,
838 .open = audamrnb_open,
839 .release = audamrnb_release,
840 .read = audamrnb_read,
841 .write = audamrnb_write,
842 .unlocked_ioctl = audamrnb_ioctl,
845 struct miscdevice audio_amrnb_misc = {
846 .minor = MISC_DYNAMIC_MINOR,
848 .fops = &audio_amrnb_fops,
851 static int __init audamrnb_init(void)
853 mutex_init(&the_amrnb_audio.lock);
854 mutex_init(&the_amrnb_audio.write_lock);
855 mutex_init(&the_amrnb_audio.read_lock);
856 spin_lock_init(&the_amrnb_audio.dsp_lock);
857 init_waitqueue_head(&the_amrnb_audio.write_wait);
858 init_waitqueue_head(&the_amrnb_audio.read_wait);
859 the_amrnb_audio.read_data = NULL;
860 return misc_register(&audio_amrnb_misc);
863 static void __exit audamrnb_exit(void)
865 misc_deregister(&audio_amrnb_misc);
868 module_init(audamrnb_init);
869 module_exit(audamrnb_exit);
871 MODULE_DESCRIPTION("MSM AMR-NB driver");
872 MODULE_LICENSE("GPL v2");
873 MODULE_AUTHOR("QUALCOMM Inc");