2 * OXFW970-based speakers driver
4 * Copyright (c) Clemens Ladisch <clemens@ladisch.de>
5 * Licensed under the terms of the GNU General Public License, version 2.
8 #include <linux/device.h>
9 #include <linux/firewire.h>
10 #include <linux/firewire-constants.h>
11 #include <linux/module.h>
12 #include <linux/mod_devicetable.h>
13 #include <linux/mutex.h>
14 #include <linux/slab.h>
15 #include <sound/control.h>
16 #include <sound/core.h>
17 #include <sound/initval.h>
18 #include <sound/pcm.h>
19 #include <sound/pcm_params.h>
25 #define OXFORD_FIRMWARE_ID_ADDRESS (CSR_REGISTER_BASE + 0x50000)
26 /* 0x970?vvvv or 0x971?vvvv, where vvvv = firmware version */
28 #define OXFORD_HARDWARE_ID_ADDRESS (CSR_REGISTER_BASE + 0x90020)
29 #define OXFORD_HARDWARE_ID_OXFW970 0x39443841
30 #define OXFORD_HARDWARE_ID_OXFW971 0x39373100
32 #define VENDOR_GRIFFIN 0x001292
33 #define VENDOR_LACIE 0x00d04b
35 #define SPECIFIER_1394TA 0x00a02d
36 #define VERSION_AVC 0x010001
39 const char *driver_name
;
40 const char *short_name
;
41 const char *long_name
;
42 int (*pcm_constraints
)(struct snd_pcm_runtime
*runtime
);
43 unsigned int mixer_channels
;
49 struct snd_card
*card
;
51 const struct device_info
*device_info
;
53 struct cmp_connection connection
;
54 struct amdtp_out_stream stream
;
61 MODULE_DESCRIPTION("FireWire speakers driver");
62 MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
63 MODULE_LICENSE("GPL v2");
65 static int firewave_rate_constraint(struct snd_pcm_hw_params
*params
,
66 struct snd_pcm_hw_rule
*rule
)
68 static unsigned int stereo_rates
[] = { 48000, 96000 };
69 struct snd_interval
*channels
=
70 hw_param_interval(params
, SNDRV_PCM_HW_PARAM_CHANNELS
);
71 struct snd_interval
*rate
=
72 hw_param_interval(params
, SNDRV_PCM_HW_PARAM_RATE
);
74 /* two channels work only at 48/96 kHz */
75 if (snd_interval_max(channels
) < 6)
76 return snd_interval_list(rate
, 2, stereo_rates
, 0);
80 static int firewave_channels_constraint(struct snd_pcm_hw_params
*params
,
81 struct snd_pcm_hw_rule
*rule
)
83 static const struct snd_interval all_channels
= { .min
= 6, .max
= 6 };
84 struct snd_interval
*rate
=
85 hw_param_interval(params
, SNDRV_PCM_HW_PARAM_RATE
);
86 struct snd_interval
*channels
=
87 hw_param_interval(params
, SNDRV_PCM_HW_PARAM_CHANNELS
);
89 /* 32/44.1 kHz work only with all six channels */
90 if (snd_interval_max(rate
) < 48000)
91 return snd_interval_refine(channels
, &all_channels
);
95 static int firewave_constraints(struct snd_pcm_runtime
*runtime
)
97 static unsigned int channels_list
[] = { 2, 6 };
98 static struct snd_pcm_hw_constraint_list channels_list_constraint
= {
100 .list
= channels_list
,
104 runtime
->hw
.rates
= SNDRV_PCM_RATE_32000
|
105 SNDRV_PCM_RATE_44100
|
106 SNDRV_PCM_RATE_48000
|
107 SNDRV_PCM_RATE_96000
;
108 runtime
->hw
.channels_max
= 6;
110 err
= snd_pcm_hw_constraint_list(runtime
, 0,
111 SNDRV_PCM_HW_PARAM_CHANNELS
,
112 &channels_list_constraint
);
115 err
= snd_pcm_hw_rule_add(runtime
, 0, SNDRV_PCM_HW_PARAM_RATE
,
116 firewave_rate_constraint
, NULL
,
117 SNDRV_PCM_HW_PARAM_CHANNELS
, -1);
120 err
= snd_pcm_hw_rule_add(runtime
, 0, SNDRV_PCM_HW_PARAM_CHANNELS
,
121 firewave_channels_constraint
, NULL
,
122 SNDRV_PCM_HW_PARAM_RATE
, -1);
129 static int lacie_speakers_constraints(struct snd_pcm_runtime
*runtime
)
131 runtime
->hw
.rates
= SNDRV_PCM_RATE_32000
|
132 SNDRV_PCM_RATE_44100
|
133 SNDRV_PCM_RATE_48000
|
134 SNDRV_PCM_RATE_88200
|
135 SNDRV_PCM_RATE_96000
;
140 static int fwspk_open(struct snd_pcm_substream
*substream
)
142 static const struct snd_pcm_hardware hardware
= {
143 .info
= SNDRV_PCM_INFO_MMAP
|
144 SNDRV_PCM_INFO_MMAP_VALID
|
145 SNDRV_PCM_INFO_BATCH
|
146 SNDRV_PCM_INFO_INTERLEAVED
|
147 SNDRV_PCM_INFO_BLOCK_TRANSFER
,
148 .formats
= AMDTP_OUT_PCM_FORMAT_BITS
,
151 .buffer_bytes_max
= 4 * 1024 * 1024,
152 .period_bytes_min
= 1,
153 .period_bytes_max
= UINT_MAX
,
155 .periods_max
= UINT_MAX
,
157 struct fwspk
*fwspk
= substream
->private_data
;
158 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
161 runtime
->hw
= hardware
;
163 err
= fwspk
->device_info
->pcm_constraints(runtime
);
166 err
= snd_pcm_limit_hw_rates(runtime
);
170 err
= snd_pcm_hw_constraint_minmax(runtime
,
171 SNDRV_PCM_HW_PARAM_PERIOD_TIME
,
176 err
= snd_pcm_hw_constraint_msbits(runtime
, 0, 32, 24);
183 static int fwspk_close(struct snd_pcm_substream
*substream
)
188 static void fwspk_stop_stream(struct fwspk
*fwspk
)
190 if (amdtp_out_stream_running(&fwspk
->stream
)) {
191 amdtp_out_stream_stop(&fwspk
->stream
);
192 cmp_connection_break(&fwspk
->connection
);
196 static int fwspk_set_rate(struct fwspk
*fwspk
, unsigned int sfc
)
201 buf
= kmalloc(8, GFP_KERNEL
);
205 buf
[0] = 0x00; /* AV/C, CONTROL */
206 buf
[1] = 0xff; /* unit */
207 buf
[2] = 0x19; /* INPUT PLUG SIGNAL FORMAT */
208 buf
[3] = 0x00; /* plug 0 */
209 buf
[4] = 0x90; /* format: audio */
210 buf
[5] = 0x00 | sfc
; /* AM824, frequency */
211 buf
[6] = 0xff; /* SYT (not used) */
214 err
= fcp_avc_transaction(fwspk
->unit
, buf
, 8, buf
, 8,
215 BIT(1) | BIT(2) | BIT(3) | BIT(4) | BIT(5));
218 if (err
< 6 || buf
[0] != 0x09 /* ACCEPTED */) {
219 dev_err(&fwspk
->unit
->device
, "failed to set sample rate\n");
232 static int fwspk_hw_params(struct snd_pcm_substream
*substream
,
233 struct snd_pcm_hw_params
*hw_params
)
235 struct fwspk
*fwspk
= substream
->private_data
;
238 mutex_lock(&fwspk
->mutex
);
239 fwspk_stop_stream(fwspk
);
240 mutex_unlock(&fwspk
->mutex
);
242 err
= snd_pcm_lib_alloc_vmalloc_buffer(substream
,
243 params_buffer_bytes(hw_params
));
247 amdtp_out_stream_set_parameters(&fwspk
->stream
,
248 params_rate(hw_params
),
249 params_channels(hw_params
),
252 amdtp_out_stream_set_pcm_format(&fwspk
->stream
,
253 params_format(hw_params
));
255 err
= fwspk_set_rate(fwspk
, fwspk
->stream
.sfc
);
262 snd_pcm_lib_free_vmalloc_buffer(substream
);
267 static int fwspk_hw_free(struct snd_pcm_substream
*substream
)
269 struct fwspk
*fwspk
= substream
->private_data
;
271 mutex_lock(&fwspk
->mutex
);
272 fwspk_stop_stream(fwspk
);
273 mutex_unlock(&fwspk
->mutex
);
275 return snd_pcm_lib_free_vmalloc_buffer(substream
);
278 static int fwspk_prepare(struct snd_pcm_substream
*substream
)
280 struct fwspk
*fwspk
= substream
->private_data
;
283 mutex_lock(&fwspk
->mutex
);
285 if (amdtp_out_streaming_error(&fwspk
->stream
))
286 fwspk_stop_stream(fwspk
);
288 if (!amdtp_out_stream_running(&fwspk
->stream
)) {
289 err
= cmp_connection_establish(&fwspk
->connection
,
290 amdtp_out_stream_get_max_payload(&fwspk
->stream
));
294 err
= amdtp_out_stream_start(&fwspk
->stream
,
295 fwspk
->connection
.resources
.channel
,
296 fwspk
->connection
.speed
);
301 mutex_unlock(&fwspk
->mutex
);
303 amdtp_out_stream_pcm_prepare(&fwspk
->stream
);
308 cmp_connection_break(&fwspk
->connection
);
310 mutex_unlock(&fwspk
->mutex
);
315 static int fwspk_trigger(struct snd_pcm_substream
*substream
, int cmd
)
317 struct fwspk
*fwspk
= substream
->private_data
;
318 struct snd_pcm_substream
*pcm
;
321 case SNDRV_PCM_TRIGGER_START
:
324 case SNDRV_PCM_TRIGGER_STOP
:
330 amdtp_out_stream_pcm_trigger(&fwspk
->stream
, pcm
);
334 static snd_pcm_uframes_t
fwspk_pointer(struct snd_pcm_substream
*substream
)
336 struct fwspk
*fwspk
= substream
->private_data
;
338 return amdtp_out_stream_pcm_pointer(&fwspk
->stream
);
341 static int fwspk_create_pcm(struct fwspk
*fwspk
)
343 static struct snd_pcm_ops ops
= {
345 .close
= fwspk_close
,
346 .ioctl
= snd_pcm_lib_ioctl
,
347 .hw_params
= fwspk_hw_params
,
348 .hw_free
= fwspk_hw_free
,
349 .prepare
= fwspk_prepare
,
350 .trigger
= fwspk_trigger
,
351 .pointer
= fwspk_pointer
,
352 .page
= snd_pcm_lib_get_vmalloc_page
,
353 .mmap
= snd_pcm_lib_mmap_vmalloc
,
358 err
= snd_pcm_new(fwspk
->card
, "OXFW970", 0, 1, 0, &pcm
);
361 pcm
->private_data
= fwspk
;
362 strcpy(pcm
->name
, fwspk
->device_info
->short_name
);
363 snd_pcm_set_ops(pcm
, SNDRV_PCM_STREAM_PLAYBACK
, &ops
);
367 enum control_action
{ CTL_READ
, CTL_WRITE
};
368 enum control_attribute
{
374 static int fwspk_mute_command(struct fwspk
*fwspk
, bool *value
,
375 enum control_action action
)
381 buf
= kmalloc(11, GFP_KERNEL
);
385 if (action
== CTL_READ
) {
386 buf
[0] = 0x01; /* AV/C, STATUS */
387 response_ok
= 0x0c; /* STABLE */
389 buf
[0] = 0x00; /* AV/C, CONTROL */
390 response_ok
= 0x09; /* ACCEPTED */
392 buf
[1] = 0x08; /* audio unit 0 */
393 buf
[2] = 0xb8; /* FUNCTION BLOCK */
394 buf
[3] = 0x81; /* function block type: feature */
395 buf
[4] = fwspk
->device_info
->mute_fb_id
; /* function block ID */
396 buf
[5] = 0x10; /* control attribute: current */
397 buf
[6] = 0x02; /* selector length */
398 buf
[7] = 0x00; /* audio channel number */
399 buf
[8] = 0x01; /* control selector: mute */
400 buf
[9] = 0x01; /* control data length */
401 if (action
== CTL_READ
)
404 buf
[10] = *value
? 0x70 : 0x60;
406 err
= fcp_avc_transaction(fwspk
->unit
, buf
, 11, buf
, 11, 0x3fe);
410 dev_err(&fwspk
->unit
->device
, "short FCP response\n");
414 if (buf
[0] != response_ok
) {
415 dev_err(&fwspk
->unit
->device
, "mute command failed\n");
419 if (action
== CTL_READ
)
420 *value
= buf
[10] == 0x70;
430 static int fwspk_volume_command(struct fwspk
*fwspk
, s16
*value
,
431 unsigned int channel
,
432 enum control_attribute attribute
,
433 enum control_action action
)
439 buf
= kmalloc(12, GFP_KERNEL
);
443 if (action
== CTL_READ
) {
444 buf
[0] = 0x01; /* AV/C, STATUS */
445 response_ok
= 0x0c; /* STABLE */
447 buf
[0] = 0x00; /* AV/C, CONTROL */
448 response_ok
= 0x09; /* ACCEPTED */
450 buf
[1] = 0x08; /* audio unit 0 */
451 buf
[2] = 0xb8; /* FUNCTION BLOCK */
452 buf
[3] = 0x81; /* function block type: feature */
453 buf
[4] = fwspk
->device_info
->volume_fb_id
; /* function block ID */
454 buf
[5] = attribute
; /* control attribute */
455 buf
[6] = 0x02; /* selector length */
456 buf
[7] = channel
; /* audio channel number */
457 buf
[8] = 0x02; /* control selector: volume */
458 buf
[9] = 0x02; /* control data length */
459 if (action
== CTL_READ
) {
463 buf
[10] = *value
>> 8;
467 err
= fcp_avc_transaction(fwspk
->unit
, buf
, 12, buf
, 12, 0x3fe);
471 dev_err(&fwspk
->unit
->device
, "short FCP response\n");
475 if (buf
[0] != response_ok
) {
476 dev_err(&fwspk
->unit
->device
, "volume command failed\n");
480 if (action
== CTL_READ
)
481 *value
= (buf
[10] << 8) | buf
[11];
491 static int fwspk_mute_get(struct snd_kcontrol
*control
,
492 struct snd_ctl_elem_value
*value
)
494 struct fwspk
*fwspk
= control
->private_data
;
496 value
->value
.integer
.value
[0] = !fwspk
->mute
;
501 static int fwspk_mute_put(struct snd_kcontrol
*control
,
502 struct snd_ctl_elem_value
*value
)
504 struct fwspk
*fwspk
= control
->private_data
;
508 mute
= !value
->value
.integer
.value
[0];
510 if (mute
== fwspk
->mute
)
513 err
= fwspk_mute_command(fwspk
, &mute
, CTL_WRITE
);
521 static int fwspk_volume_info(struct snd_kcontrol
*control
,
522 struct snd_ctl_elem_info
*info
)
524 struct fwspk
*fwspk
= control
->private_data
;
526 info
->type
= SNDRV_CTL_ELEM_TYPE_INTEGER
;
527 info
->count
= fwspk
->device_info
->mixer_channels
;
528 info
->value
.integer
.min
= fwspk
->volume_min
;
529 info
->value
.integer
.max
= fwspk
->volume_max
;
534 static const u8 channel_map
[6] = { 0, 1, 4, 5, 2, 3 };
536 static int fwspk_volume_get(struct snd_kcontrol
*control
,
537 struct snd_ctl_elem_value
*value
)
539 struct fwspk
*fwspk
= control
->private_data
;
542 for (i
= 0; i
< fwspk
->device_info
->mixer_channels
; ++i
)
543 value
->value
.integer
.value
[channel_map
[i
]] = fwspk
->volume
[i
];
548 static int fwspk_volume_put(struct snd_kcontrol
*control
,
549 struct snd_ctl_elem_value
*value
)
551 struct fwspk
*fwspk
= control
->private_data
;
552 unsigned int i
, changed_channels
;
553 bool equal_values
= true;
557 for (i
= 0; i
< fwspk
->device_info
->mixer_channels
; ++i
) {
558 if (value
->value
.integer
.value
[i
] < fwspk
->volume_min
||
559 value
->value
.integer
.value
[i
] > fwspk
->volume_max
)
561 if (value
->value
.integer
.value
[i
] !=
562 value
->value
.integer
.value
[0])
563 equal_values
= false;
566 changed_channels
= 0;
567 for (i
= 0; i
< fwspk
->device_info
->mixer_channels
; ++i
)
568 if (value
->value
.integer
.value
[channel_map
[i
]] !=
570 changed_channels
|= 1 << (i
+ 1);
572 if (equal_values
&& changed_channels
!= 0)
573 changed_channels
= 1 << 0;
575 for (i
= 0; i
<= fwspk
->device_info
->mixer_channels
; ++i
) {
576 volume
= value
->value
.integer
.value
[channel_map
[i
? i
- 1 : 0]];
577 if (changed_channels
& (1 << i
)) {
578 err
= fwspk_volume_command(fwspk
, &volume
, i
,
579 CTL_CURRENT
, CTL_WRITE
);
584 fwspk
->volume
[i
- 1] = volume
;
587 return changed_channels
!= 0;
590 static int fwspk_create_mixer(struct fwspk
*fwspk
)
592 static const struct snd_kcontrol_new controls
[] = {
594 .iface
= SNDRV_CTL_ELEM_IFACE_MIXER
,
595 .name
= "PCM Playback Switch",
596 .info
= snd_ctl_boolean_mono_info
,
597 .get
= fwspk_mute_get
,
598 .put
= fwspk_mute_put
,
601 .iface
= SNDRV_CTL_ELEM_IFACE_MIXER
,
602 .name
= "PCM Playback Volume",
603 .info
= fwspk_volume_info
,
604 .get
= fwspk_volume_get
,
605 .put
= fwspk_volume_put
,
608 unsigned int i
, first_ch
;
611 err
= fwspk_volume_command(fwspk
, &fwspk
->volume_min
,
612 0, CTL_MIN
, CTL_READ
);
615 err
= fwspk_volume_command(fwspk
, &fwspk
->volume_max
,
616 0, CTL_MAX
, CTL_READ
);
620 err
= fwspk_mute_command(fwspk
, &fwspk
->mute
, CTL_READ
);
624 first_ch
= fwspk
->device_info
->mixer_channels
== 1 ? 0 : 1;
625 for (i
= 0; i
< fwspk
->device_info
->mixer_channels
; ++i
) {
626 err
= fwspk_volume_command(fwspk
, &fwspk
->volume
[i
],
627 first_ch
+ i
, CTL_CURRENT
, CTL_READ
);
632 for (i
= 0; i
< ARRAY_SIZE(controls
); ++i
) {
633 err
= snd_ctl_add(fwspk
->card
,
634 snd_ctl_new1(&controls
[i
], fwspk
));
642 static u32
fwspk_read_firmware_version(struct fw_unit
*unit
)
647 err
= snd_fw_transaction(unit
, TCODE_READ_QUADLET_REQUEST
,
648 OXFORD_FIRMWARE_ID_ADDRESS
, &data
, 4, 0);
649 return err
>= 0 ? be32_to_cpu(data
) : 0;
652 static void fwspk_card_free(struct snd_card
*card
)
654 struct fwspk
*fwspk
= card
->private_data
;
656 amdtp_out_stream_destroy(&fwspk
->stream
);
657 cmp_connection_destroy(&fwspk
->connection
);
658 fw_unit_put(fwspk
->unit
);
659 mutex_destroy(&fwspk
->mutex
);
662 static int fwspk_probe(struct fw_unit
*unit
,
663 const struct ieee1394_device_id
*id
)
665 struct fw_device
*fw_dev
= fw_parent_device(unit
);
666 struct snd_card
*card
;
671 err
= snd_card_new(&unit
->device
, -1, NULL
, THIS_MODULE
,
672 sizeof(*fwspk
), &card
);
676 fwspk
= card
->private_data
;
678 mutex_init(&fwspk
->mutex
);
679 fwspk
->unit
= fw_unit_get(unit
);
680 fwspk
->device_info
= (const struct device_info
*)id
->driver_data
;
682 err
= cmp_connection_init(&fwspk
->connection
, unit
, 0);
686 err
= amdtp_out_stream_init(&fwspk
->stream
, unit
, CIP_NONBLOCKING
);
690 card
->private_free
= fwspk_card_free
;
692 strcpy(card
->driver
, fwspk
->device_info
->driver_name
);
693 strcpy(card
->shortname
, fwspk
->device_info
->short_name
);
694 firmware
= fwspk_read_firmware_version(unit
);
695 snprintf(card
->longname
, sizeof(card
->longname
),
696 "%s (OXFW%x %04x), GUID %08x%08x at %s, S%d",
697 fwspk
->device_info
->long_name
,
698 firmware
>> 20, firmware
& 0xffff,
699 fw_dev
->config_rom
[3], fw_dev
->config_rom
[4],
700 dev_name(&unit
->device
), 100 << fw_dev
->max_speed
);
701 strcpy(card
->mixername
, "OXFW970");
703 err
= fwspk_create_pcm(fwspk
);
707 err
= fwspk_create_mixer(fwspk
);
711 err
= snd_card_register(card
);
715 dev_set_drvdata(&unit
->device
, fwspk
);
720 cmp_connection_destroy(&fwspk
->connection
);
722 fw_unit_put(fwspk
->unit
);
723 mutex_destroy(&fwspk
->mutex
);
729 static void fwspk_bus_reset(struct fw_unit
*unit
)
731 struct fwspk
*fwspk
= dev_get_drvdata(&unit
->device
);
733 fcp_bus_reset(fwspk
->unit
);
735 if (cmp_connection_update(&fwspk
->connection
) < 0) {
736 amdtp_out_stream_pcm_abort(&fwspk
->stream
);
737 mutex_lock(&fwspk
->mutex
);
738 fwspk_stop_stream(fwspk
);
739 mutex_unlock(&fwspk
->mutex
);
743 amdtp_out_stream_update(&fwspk
->stream
);
746 static void fwspk_remove(struct fw_unit
*unit
)
748 struct fwspk
*fwspk
= dev_get_drvdata(&unit
->device
);
750 amdtp_out_stream_pcm_abort(&fwspk
->stream
);
751 snd_card_disconnect(fwspk
->card
);
753 mutex_lock(&fwspk
->mutex
);
754 fwspk_stop_stream(fwspk
);
755 mutex_unlock(&fwspk
->mutex
);
757 snd_card_free_when_closed(fwspk
->card
);
760 static const struct device_info griffin_firewave
= {
761 .driver_name
= "FireWave",
762 .short_name
= "FireWave",
763 .long_name
= "Griffin FireWave Surround",
764 .pcm_constraints
= firewave_constraints
,
767 .volume_fb_id
= 0x02,
770 static const struct device_info lacie_speakers
= {
771 .driver_name
= "FWSpeakers",
772 .short_name
= "FireWire Speakers",
773 .long_name
= "LaCie FireWire Speakers",
774 .pcm_constraints
= lacie_speakers_constraints
,
777 .volume_fb_id
= 0x01,
780 static const struct ieee1394_device_id fwspk_id_table
[] = {
782 .match_flags
= IEEE1394_MATCH_VENDOR_ID
|
783 IEEE1394_MATCH_MODEL_ID
|
784 IEEE1394_MATCH_SPECIFIER_ID
|
785 IEEE1394_MATCH_VERSION
,
786 .vendor_id
= VENDOR_GRIFFIN
,
787 .model_id
= 0x00f970,
788 .specifier_id
= SPECIFIER_1394TA
,
789 .version
= VERSION_AVC
,
790 .driver_data
= (kernel_ulong_t
)&griffin_firewave
,
793 .match_flags
= IEEE1394_MATCH_VENDOR_ID
|
794 IEEE1394_MATCH_MODEL_ID
|
795 IEEE1394_MATCH_SPECIFIER_ID
|
796 IEEE1394_MATCH_VERSION
,
797 .vendor_id
= VENDOR_LACIE
,
798 .model_id
= 0x00f970,
799 .specifier_id
= SPECIFIER_1394TA
,
800 .version
= VERSION_AVC
,
801 .driver_data
= (kernel_ulong_t
)&lacie_speakers
,
805 MODULE_DEVICE_TABLE(ieee1394
, fwspk_id_table
);
807 static struct fw_driver fwspk_driver
= {
809 .owner
= THIS_MODULE
,
810 .name
= KBUILD_MODNAME
,
813 .probe
= fwspk_probe
,
814 .update
= fwspk_bus_reset
,
815 .remove
= fwspk_remove
,
816 .id_table
= fwspk_id_table
,
819 static int __init
alsa_fwspk_init(void)
821 return driver_register(&fwspk_driver
.driver
);
824 static void __exit
alsa_fwspk_exit(void)
826 driver_unregister(&fwspk_driver
.driver
);
829 module_init(alsa_fwspk_init
);
830 module_exit(alsa_fwspk_exit
);