| /Linux-v5.4/sound/core/ |
| D | pcm_local.h | 23 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream);
24 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream);
29 int pcm_lib_apply_appl_ptr(struct snd_pcm_substream *substream,
31 int snd_pcm_update_state(struct snd_pcm_substream *substream,
33 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream);
35 void snd_pcm_playback_silence(struct snd_pcm_substream *substream,
39 snd_pcm_avail(struct snd_pcm_substream *substream) in snd_pcm_avail()
48 snd_pcm_hw_avail(struct snd_pcm_substream *substream) in snd_pcm_hw_avail()
57 void snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream);
58 void snd_pcm_timer_init(struct snd_pcm_substream *substream);
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| D | pcm_memory.c | 36 static int preallocate_pcm_pages(struct snd_pcm_substream *substream, size_t size) in preallocate_pcm_pages()
62 static void snd_pcm_lib_preallocate_dma_free(struct snd_pcm_substream *substream) in snd_pcm_lib_preallocate_dma_free()
76 void snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream) in snd_pcm_lib_preallocate_free()
89 struct snd_pcm_substream *substream; in snd_pcm_lib_preallocate_free_for_all()
107 struct snd_pcm_substream *substream = entry->private_data; in snd_pcm_lib_preallocate_proc_read()
119 struct snd_pcm_substream *substream = entry->private_data; in snd_pcm_lib_preallocate_max_proc_read()
131 struct snd_pcm_substream *substream = entry->private_data; in snd_pcm_lib_preallocate_proc_write()
170 static inline void preallocate_info_init(struct snd_pcm_substream *substream) in preallocate_info_init()
196 static void snd_pcm_lib_preallocate_pages1(struct snd_pcm_substream *substream, in snd_pcm_lib_preallocate_pages1()
220 void snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream, in snd_pcm_lib_preallocate_pages()
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| D | pcm_native.c | 62 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
64 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
106 void snd_pcm_stream_lock(struct snd_pcm_substream *substream) in snd_pcm_stream_lock()
118 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream) in snd_pcm_stream_unlock()
132 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream) in snd_pcm_stream_lock_irq()
145 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream) in snd_pcm_stream_unlock_irq()
152 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream) in _snd_pcm_stream_lock_irqsave()
170 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream, in snd_pcm_stream_unlock_irqrestore()
180 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info) in snd_pcm_info()
201 int snd_pcm_info_user(struct snd_pcm_substream *substream, in snd_pcm_info_user()
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| D | pcm_dmaengine.c | 30 const struct snd_pcm_substream *substream) in substream_to_prtd()
35 struct dma_chan *snd_dmaengine_pcm_get_chan(struct snd_pcm_substream *substream) in snd_dmaengine_pcm_get_chan()
52 int snd_hwparams_to_dma_slave_config(const struct snd_pcm_substream *substream, in snd_hwparams_to_dma_slave_config()
105 const struct snd_pcm_substream *substream, in snd_dmaengine_pcm_set_config_from_dai_data()
133 struct snd_pcm_substream *substream = arg; in dmaengine_pcm_dma_complete()
143 static int dmaengine_pcm_prepare_and_submit(struct snd_pcm_substream *substream) in dmaengine_pcm_prepare_and_submit()
182 int snd_dmaengine_pcm_trigger(struct snd_pcm_substream *substream, int cmd) in snd_dmaengine_pcm_trigger()
226 snd_pcm_uframes_t snd_dmaengine_pcm_pointer_no_residue(struct snd_pcm_substream *substream) in snd_dmaengine_pcm_pointer_no_residue()
240 snd_pcm_uframes_t snd_dmaengine_pcm_pointer(struct snd_pcm_substream *substream) in snd_dmaengine_pcm_pointer()
292 int snd_dmaengine_pcm_open(struct snd_pcm_substream *substream, in snd_dmaengine_pcm_open()
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| D | pcm_timer.c | 19 void snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream) in snd_pcm_timer_resolution_change()
54 struct snd_pcm_substream *substream; in snd_pcm_timer_resolution()
62 struct snd_pcm_substream *substream; in snd_pcm_timer_start()
71 struct snd_pcm_substream *substream; in snd_pcm_timer_stop()
94 struct snd_pcm_substream *substream = timer->private_data; in snd_pcm_timer_free()
98 void snd_pcm_timer_init(struct snd_pcm_substream *substream) in snd_pcm_timer_init()
124 void snd_pcm_timer_done(struct snd_pcm_substream *substream) in snd_pcm_timer_done()
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| /Linux-v5.4/include/sound/ |
| D | pcm.h | 47 struct snd_pcm_substream;
53 int (*open)(struct snd_pcm_substream *substream);
54 int (*close)(struct snd_pcm_substream *substream);
55 int (*ioctl)(struct snd_pcm_substream * substream,
57 int (*hw_params)(struct snd_pcm_substream *substream,
59 int (*hw_free)(struct snd_pcm_substream *substream);
60 int (*prepare)(struct snd_pcm_substream *substream);
61 int (*trigger)(struct snd_pcm_substream *substream, int cmd);
62 snd_pcm_uframes_t (*pointer)(struct snd_pcm_substream *substream);
63 int (*get_time_info)(struct snd_pcm_substream *substream,
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| D | dmaengine_pcm.h | 20 snd_pcm_substream_to_dma_direction(const struct snd_pcm_substream *substream) in snd_pcm_substream_to_dma_direction()
28 int snd_hwparams_to_dma_slave_config(const struct snd_pcm_substream *substream,
30 int snd_dmaengine_pcm_trigger(struct snd_pcm_substream *substream, int cmd);
31 snd_pcm_uframes_t snd_dmaengine_pcm_pointer(struct snd_pcm_substream *substream);
32 snd_pcm_uframes_t snd_dmaengine_pcm_pointer_no_residue(struct snd_pcm_substream *substream);
34 int snd_dmaengine_pcm_open(struct snd_pcm_substream *substream,
36 int snd_dmaengine_pcm_close(struct snd_pcm_substream *substream);
38 int snd_dmaengine_pcm_open_request_chan(struct snd_pcm_substream *substream,
40 int snd_dmaengine_pcm_close_release_chan(struct snd_pcm_substream *substream);
44 struct dma_chan *snd_dmaengine_pcm_get_chan(struct snd_pcm_substream *substream);
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| D | pxa2xx-lib.h | 9 struct snd_pcm_substream;
14 extern int pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream,
16 extern int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream);
17 extern int pxa2xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd);
18 extern snd_pcm_uframes_t pxa2xx_pcm_pointer(struct snd_pcm_substream *substream);
19 extern int pxa2xx_pcm_prepare(struct snd_pcm_substream *substream);
20 extern int pxa2xx_pcm_open(struct snd_pcm_substream *substream);
21 extern int pxa2xx_pcm_close(struct snd_pcm_substream *substream);
22 extern int pxa2xx_pcm_mmap(struct snd_pcm_substream *substream,
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| D | soc-dai.h | 17 struct snd_pcm_substream;
149 struct snd_pcm_substream *substream,
152 struct snd_pcm_substream *substream);
154 struct snd_pcm_substream *substream);
156 struct snd_pcm_substream *substream);
158 struct snd_pcm_substream *substream);
160 struct snd_pcm_substream *substream, int cmd);
162 struct snd_pcm_substream *substream, int cmd);
164 struct snd_pcm_substream *substream);
216 int (*startup)(struct snd_pcm_substream *,
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| D | soc-component.h | 350 struct snd_pcm_substream *substream);
352 struct snd_pcm_substream *substream);
354 struct snd_pcm_substream *substream);
356 struct snd_pcm_substream *substream,
359 struct snd_pcm_substream *substream);
361 struct snd_pcm_substream *substream,
374 int snd_soc_pcm_component_pointer(struct snd_pcm_substream *substream);
375 int snd_soc_pcm_component_ioctl(struct snd_pcm_substream *substream,
377 int snd_soc_pcm_component_copy_user(struct snd_pcm_substream *substream,
380 struct page *snd_soc_pcm_component_page(struct snd_pcm_substream *substream,
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| /Linux-v5.4/sound/core/oss/ |
| D | pcm_plugin.h | 61 struct snd_pcm_substream *plug;
70 int snd_pcm_plugin_build(struct snd_pcm_substream *handle,
78 int snd_pcm_plug_alloc(struct snd_pcm_substream *plug, snd_pcm_uframes_t frames);
79 snd_pcm_sframes_t snd_pcm_plug_client_size(struct snd_pcm_substream *handle, snd_pcm_uframes_t drv_…
80 snd_pcm_sframes_t snd_pcm_plug_slave_size(struct snd_pcm_substream *handle, snd_pcm_uframes_t clt_s…
85 int snd_pcm_plugin_build_io(struct snd_pcm_substream *handle,
88 int snd_pcm_plugin_build_linear(struct snd_pcm_substream *handle,
92 int snd_pcm_plugin_build_mulaw(struct snd_pcm_substream *handle,
96 int snd_pcm_plugin_build_rate(struct snd_pcm_substream *handle,
100 int snd_pcm_plugin_build_route(struct snd_pcm_substream *handle,
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| /Linux-v5.4/sound/soc/mediatek/common/ |
| D | mtk-afe-fe-dai.h | 16 int mtk_afe_fe_startup(struct snd_pcm_substream *substream,
18 void mtk_afe_fe_shutdown(struct snd_pcm_substream *substream,
20 int mtk_afe_fe_hw_params(struct snd_pcm_substream *substream,
23 int mtk_afe_fe_hw_free(struct snd_pcm_substream *substream,
25 int mtk_afe_fe_prepare(struct snd_pcm_substream *substream,
27 int mtk_afe_fe_trigger(struct snd_pcm_substream *substream, int cmd,
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| /Linux-v5.4/sound/pci/aw2/ |
| D | aw2-alsa.c | 108 static int snd_aw2_pcm_playback_open(struct snd_pcm_substream *substream);
109 static int snd_aw2_pcm_playback_close(struct snd_pcm_substream *substream);
110 static int snd_aw2_pcm_capture_open(struct snd_pcm_substream *substream);
111 static int snd_aw2_pcm_capture_close(struct snd_pcm_substream *substream);
112 static int snd_aw2_pcm_hw_params(struct snd_pcm_substream *substream,
114 static int snd_aw2_pcm_hw_free(struct snd_pcm_substream *substream);
115 static int snd_aw2_pcm_prepare_playback(struct snd_pcm_substream *substream);
116 static int snd_aw2_pcm_prepare_capture(struct snd_pcm_substream *substream);
117 static int snd_aw2_pcm_trigger_playback(struct snd_pcm_substream *substream,
119 static int snd_aw2_pcm_trigger_capture(struct snd_pcm_substream *substream,
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| /Linux-v5.4/sound/firewire/tascam/ |
| D | tascam-pcm.c | 11 struct snd_pcm_substream *substream) in pcm_init_hw_params()
43 static int pcm_open(struct snd_pcm_substream *substream) in pcm_open()
80 static int pcm_close(struct snd_pcm_substream *substream) in pcm_close()
89 static int pcm_hw_params(struct snd_pcm_substream *substream, in pcm_hw_params()
113 static int pcm_hw_free(struct snd_pcm_substream *substream) in pcm_hw_free()
129 static int pcm_capture_prepare(struct snd_pcm_substream *substream) in pcm_capture_prepare()
146 static int pcm_playback_prepare(struct snd_pcm_substream *substream) in pcm_playback_prepare()
163 static int pcm_capture_trigger(struct snd_pcm_substream *substream, int cmd) in pcm_capture_trigger()
181 static int pcm_playback_trigger(struct snd_pcm_substream *substream, int cmd) in pcm_playback_trigger()
199 static snd_pcm_uframes_t pcm_capture_pointer(struct snd_pcm_substream *sbstrm) in pcm_capture_pointer()
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| /Linux-v5.4/sound/drivers/ |
| D | pcm-indirect2.h | 102 typedef size_t (*snd_pcm_indirect2_copy_t) (struct snd_pcm_substream *substream,
105 typedef size_t (*snd_pcm_indirect2_zero_t) (struct snd_pcm_substream *substream,
109 void snd_pcm_indirect2_stat(struct snd_pcm_substream *substream,
114 snd_pcm_indirect2_pointer(struct snd_pcm_substream *substream,
117 snd_pcm_indirect2_playback_interrupt(struct snd_pcm_substream *substream,
122 snd_pcm_indirect2_capture_interrupt(struct snd_pcm_substream *substream,
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| /Linux-v5.4/sound/firewire/oxfw/ |
| D | oxfw-pcm.c | 110 struct snd_pcm_substream *substream) in init_hw_params()
146 static int limit_to_current_params(struct snd_pcm_substream *substream) in limit_to_current_params()
170 static int pcm_open(struct snd_pcm_substream *substream) in pcm_open()
202 static int pcm_close(struct snd_pcm_substream *substream) in pcm_close()
210 static int pcm_capture_hw_params(struct snd_pcm_substream *substream, in pcm_capture_hw_params()
235 static int pcm_playback_hw_params(struct snd_pcm_substream *substream, in pcm_playback_hw_params()
261 static int pcm_capture_hw_free(struct snd_pcm_substream *substream) in pcm_capture_hw_free()
276 static int pcm_playback_hw_free(struct snd_pcm_substream *substream) in pcm_playback_hw_free()
292 static int pcm_capture_prepare(struct snd_pcm_substream *substream) in pcm_capture_prepare()
307 static int pcm_playback_prepare(struct snd_pcm_substream *substream) in pcm_playback_prepare()
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| /Linux-v5.4/sound/arm/ |
| D | pxa2xx-pcm-lib.c | 32 int pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream, in pxa2xx_pcm_hw_params()
63 int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream) in pxa2xx_pcm_hw_free()
70 int pxa2xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd) in pxa2xx_pcm_trigger()
77 pxa2xx_pcm_pointer(struct snd_pcm_substream *substream) in pxa2xx_pcm_pointer()
83 int pxa2xx_pcm_prepare(struct snd_pcm_substream *substream) in pxa2xx_pcm_prepare()
89 int pxa2xx_pcm_open(struct snd_pcm_substream *substream) in pxa2xx_pcm_open()
128 int pxa2xx_pcm_close(struct snd_pcm_substream *substream) in pxa2xx_pcm_close()
134 int pxa2xx_pcm_mmap(struct snd_pcm_substream *substream, in pxa2xx_pcm_mmap()
145 struct snd_pcm_substream *substream = pcm->streams[stream].substream; in pxa2xx_pcm_preallocate_dma_buffer()
161 struct snd_pcm_substream *substream; in pxa2xx_pcm_free_dma_buffers()
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| /Linux-v5.4/sound/firewire/digi00x/ |
| D | digi00x-pcm.c | 58 struct snd_pcm_substream *substream) in pcm_init_hw_params()
100 static int pcm_open(struct snd_pcm_substream *substream) in pcm_open()
148 static int pcm_close(struct snd_pcm_substream *substream) in pcm_close()
157 static int pcm_hw_params(struct snd_pcm_substream *substream, in pcm_hw_params()
181 static int pcm_hw_free(struct snd_pcm_substream *substream) in pcm_hw_free()
197 static int pcm_capture_prepare(struct snd_pcm_substream *substream) in pcm_capture_prepare()
213 static int pcm_playback_prepare(struct snd_pcm_substream *substream) in pcm_playback_prepare()
231 static int pcm_capture_trigger(struct snd_pcm_substream *substream, int cmd) in pcm_capture_trigger()
249 static int pcm_playback_trigger(struct snd_pcm_substream *substream, int cmd) in pcm_playback_trigger()
267 static snd_pcm_uframes_t pcm_capture_pointer(struct snd_pcm_substream *sbstrm) in pcm_capture_pointer()
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| /Linux-v5.4/sound/firewire/bebob/ |
| D | bebob_pcm.c | 96 struct snd_pcm_substream *substream) in pcm_init_hw_params()
133 pcm_open(struct snd_pcm_substream *substream) in pcm_open()
180 pcm_close(struct snd_pcm_substream *substream) in pcm_close()
187 static int pcm_hw_params(struct snd_pcm_substream *substream, in pcm_hw_params()
211 static int pcm_hw_free(struct snd_pcm_substream *substream) in pcm_hw_free()
228 pcm_capture_prepare(struct snd_pcm_substream *substream) in pcm_capture_prepare()
240 pcm_playback_prepare(struct snd_pcm_substream *substream) in pcm_playback_prepare()
253 pcm_capture_trigger(struct snd_pcm_substream *substream, int cmd) in pcm_capture_trigger()
271 pcm_playback_trigger(struct snd_pcm_substream *substream, int cmd) in pcm_playback_trigger()
290 pcm_capture_pointer(struct snd_pcm_substream *sbstrm) in pcm_capture_pointer()
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| /Linux-v5.4/sound/firewire/fireworks/ |
| D | fireworks_pcm.c | 133 struct snd_pcm_substream *substream) in pcm_init_hw_params()
173 static int pcm_open(struct snd_pcm_substream *substream) in pcm_open()
214 static int pcm_close(struct snd_pcm_substream *substream) in pcm_close()
221 static int pcm_hw_params(struct snd_pcm_substream *substream, in pcm_hw_params()
245 static int pcm_hw_free(struct snd_pcm_substream *substream) in pcm_hw_free()
261 static int pcm_capture_prepare(struct snd_pcm_substream *substream) in pcm_capture_prepare()
272 static int pcm_playback_prepare(struct snd_pcm_substream *substream) in pcm_playback_prepare()
284 static int pcm_capture_trigger(struct snd_pcm_substream *substream, int cmd) in pcm_capture_trigger()
301 static int pcm_playback_trigger(struct snd_pcm_substream *substream, int cmd) in pcm_playback_trigger()
319 static snd_pcm_uframes_t pcm_capture_pointer(struct snd_pcm_substream *sbstrm) in pcm_capture_pointer()
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| /Linux-v5.4/sound/firewire/dice/ |
| D | dice-pcm.c | 14 struct snd_pcm_substream *substream = rule->private; in dice_rate_constraint()
52 struct snd_pcm_substream *substream = rule->private; in dice_channels_constraint()
126 struct snd_pcm_substream *substream) in init_hw_info()
164 static int pcm_open(struct snd_pcm_substream *substream) in pcm_open()
224 static int pcm_close(struct snd_pcm_substream *substream) in pcm_close()
233 static int pcm_hw_params(struct snd_pcm_substream *substream, in pcm_hw_params()
257 static int pcm_hw_free(struct snd_pcm_substream *substream) in pcm_hw_free()
273 static int capture_prepare(struct snd_pcm_substream *substream) in capture_prepare()
287 static int playback_prepare(struct snd_pcm_substream *substream) in playback_prepare()
302 static int capture_trigger(struct snd_pcm_substream *substream, int cmd) in capture_trigger()
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| /Linux-v5.4/drivers/media/pci/cobalt/ |
| D | cobalt-alsa-pcm.c | 102 struct snd_pcm_substream *substream; in cobalt_alsa_announce_pcm_data()
207 static int snd_cobalt_pcm_capture_open(struct snd_pcm_substream *substream) in snd_cobalt_pcm_capture_open()
230 static int snd_cobalt_pcm_capture_close(struct snd_pcm_substream *substream) in snd_cobalt_pcm_capture_close()
241 static int snd_cobalt_pcm_ioctl(struct snd_pcm_substream *substream, in snd_cobalt_pcm_ioctl()
248 static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs, in snd_pcm_alloc_vmalloc_buffer()
269 static int snd_cobalt_pcm_hw_params(struct snd_pcm_substream *substream, in snd_cobalt_pcm_hw_params()
278 static int snd_cobalt_pcm_hw_free(struct snd_pcm_substream *substream) in snd_cobalt_pcm_hw_free()
289 static int snd_cobalt_pcm_prepare(struct snd_pcm_substream *substream) in snd_cobalt_pcm_prepare()
299 static int snd_cobalt_pcm_trigger(struct snd_pcm_substream *substream, int cmd) in snd_cobalt_pcm_trigger()
312 snd_pcm_uframes_t snd_cobalt_pcm_pointer(struct snd_pcm_substream *substream) in snd_cobalt_pcm_pointer()
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| /Linux-v5.4/sound/usb/line6/ |
| D | pcm.h | 184 extern int snd_line6_trigger(struct snd_pcm_substream *substream, int cmd);
185 extern int snd_line6_prepare(struct snd_pcm_substream *substream);
186 extern int snd_line6_hw_params(struct snd_pcm_substream *substream,
188 extern int snd_line6_hw_free(struct snd_pcm_substream *substream);
189 extern snd_pcm_uframes_t snd_line6_pointer(struct snd_pcm_substream *substream);
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| /Linux-v5.4/drivers/media/pci/cx18/ |
| D | cx18-alsa-pcm.c | 62 struct snd_pcm_substream *substream; in cx18_alsa_announce_pcm_data()
135 static int snd_cx18_pcm_capture_open(struct snd_pcm_substream *substream) in snd_cx18_pcm_capture_open()
183 static int snd_cx18_pcm_capture_close(struct snd_pcm_substream *substream) in snd_cx18_pcm_capture_close()
204 static int snd_cx18_pcm_ioctl(struct snd_pcm_substream *substream, in snd_cx18_pcm_ioctl()
217 static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs, in snd_pcm_alloc_vmalloc_buffer()
238 static int snd_cx18_pcm_hw_params(struct snd_pcm_substream *substream, in snd_cx18_pcm_hw_params()
247 static int snd_cx18_pcm_hw_free(struct snd_pcm_substream *substream) in snd_cx18_pcm_hw_free()
265 static int snd_cx18_pcm_prepare(struct snd_pcm_substream *substream) in snd_cx18_pcm_prepare()
275 static int snd_cx18_pcm_trigger(struct snd_pcm_substream *substream, int cmd) in snd_cx18_pcm_trigger()
281 snd_pcm_uframes_t snd_cx18_pcm_pointer(struct snd_pcm_substream *substream) in snd_cx18_pcm_pointer()
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| /Linux-v5.4/drivers/media/pci/ivtv/ |
| D | ivtv-alsa-pcm.c | 60 struct snd_pcm_substream *substream; in ivtv_alsa_announce_pcm_data()
133 static int snd_ivtv_pcm_capture_open(struct snd_pcm_substream *substream) in snd_ivtv_pcm_capture_open()
188 static int snd_ivtv_pcm_capture_close(struct snd_pcm_substream *substream) in snd_ivtv_pcm_capture_close()
209 static int snd_ivtv_pcm_ioctl(struct snd_pcm_substream *substream, in snd_ivtv_pcm_ioctl()
222 static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs, in snd_pcm_alloc_vmalloc_buffer()
243 static int snd_ivtv_pcm_hw_params(struct snd_pcm_substream *substream, in snd_ivtv_pcm_hw_params()
252 static int snd_ivtv_pcm_hw_free(struct snd_pcm_substream *substream) in snd_ivtv_pcm_hw_free()
270 static int snd_ivtv_pcm_prepare(struct snd_pcm_substream *substream) in snd_ivtv_pcm_prepare()
280 static int snd_ivtv_pcm_trigger(struct snd_pcm_substream *substream, int cmd) in snd_ivtv_pcm_trigger()
286 snd_pcm_uframes_t snd_ivtv_pcm_pointer(struct snd_pcm_substream *substream) in snd_ivtv_pcm_pointer()
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