1 // SPDX-License-Identifier: GPL-2.0+
3  * u_uac1.c -- ALSA audio utilities for Gadget stack
24 /*-------------------------------------------------------------------------*/
47 			changed = -EINVAL;  in _snd_pcm_hw_param_set()
53 				val--;  in _snd_pcm_hw_param_set()
60 			changed = -EINVAL;  in _snd_pcm_hw_param_set()
71 				t.min = val - 1;  in _snd_pcm_hw_param_set()
80 		return -EINVAL;  in _snd_pcm_hw_param_set()
82 		params->cmask |= 1 << var;  in _snd_pcm_hw_param_set()
83 		params->rmask |= 1 << var;  in _snd_pcm_hw_param_set()
87 /*-------------------------------------------------------------------------*/
94 	struct snd_pcm_substream *substream = snd->substream;  in playback_default_hw_params()
101 	* CHANNELS: 2  in playback_default_hw_params()
104 	snd->access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;  in playback_default_hw_params()
105 	snd->format = SNDRV_PCM_FORMAT_S16_LE;  in playback_default_hw_params()
106 	snd->channels = 2;  in playback_default_hw_params()
107 	snd->rate = 48000;  in playback_default_hw_params()
111 		return -ENOMEM;  in playback_default_hw_params()
115 			snd->access, 0);  in playback_default_hw_params()
117 			snd->format, 0);  in playback_default_hw_params()
119 			snd->channels, 0);  in playback_default_hw_params()
121 			snd->rate, 0);  in playback_default_hw_params()
128 		ERROR(snd->card,  in playback_default_hw_params()
135 	snd->access = params_access(params);  in playback_default_hw_params()
136 	snd->format = params_format(params);  in playback_default_hw_params()
137 	snd->channels = params_channels(params);  in playback_default_hw_params()
138 	snd->rate = params_rate(params);  in playback_default_hw_params()
142 	INFO(snd->card,  in playback_default_hw_params()
143 		"Hardware params: access %x, format %x, channels %d, rate %d\n",  in playback_default_hw_params()
144 		snd->access, snd->format, snd->channels, snd->rate);  in playback_default_hw_params()
154 	struct gaudio_snd_dev	*snd = &card->playback;  in u_audio_playback()
155 	struct snd_pcm_substream *substream = snd->substream;  in u_audio_playback()
156 	struct snd_pcm_runtime *runtime = substream->runtime;  in u_audio_playback()
161 	if (runtime->state == SNDRV_PCM_STATE_XRUN ||  in u_audio_playback()
162 		runtime->state == SNDRV_PCM_STATE_SUSPENDED) {  in u_audio_playback()
173 	result = snd_pcm_kernel_write(snd->substream, buf, frames);  in u_audio_playback()
184 	return card->playback.channels;  in u_audio_get_playback_channels()
189 	return card->playback.rate;  in u_audio_get_playback_rate()
203 	opts = container_of(card->func.fi, struct f_uac1_legacy_opts,  in gaudio_open_snd_dev()
205 	fn_play = opts->fn_play;  in gaudio_open_snd_dev()
206 	fn_cap = opts->fn_cap;  in gaudio_open_snd_dev()
207 	fn_cntl = opts->fn_cntl;  in gaudio_open_snd_dev()
210 	snd = &card->control;  in gaudio_open_snd_dev()
211 	snd->filp = filp_open(fn_cntl, O_RDWR, 0);  in gaudio_open_snd_dev()
212 	if (IS_ERR(snd->filp)) {  in gaudio_open_snd_dev()
213 		int ret = PTR_ERR(snd->filp);  in gaudio_open_snd_dev()
216 		snd->filp = NULL;  in gaudio_open_snd_dev()
219 	snd->card = card;  in gaudio_open_snd_dev()
222 	snd = &card->playback;  in gaudio_open_snd_dev()
223 	snd->filp = filp_open(fn_play, O_WRONLY, 0);  in gaudio_open_snd_dev()
224 	if (IS_ERR(snd->filp)) {  in gaudio_open_snd_dev()
225 		int ret = PTR_ERR(snd->filp);  in gaudio_open_snd_dev()
228 		snd->filp = NULL;  in gaudio_open_snd_dev()
231 	pcm_file = snd->filp->private_data;  in gaudio_open_snd_dev()
232 	snd->substream = pcm_file->substream;  in gaudio_open_snd_dev()
233 	snd->card = card;  in gaudio_open_snd_dev()
236 	/* Open PCM capture device and setup substream */  in gaudio_open_snd_dev()
237 	snd = &card->capture;  in gaudio_open_snd_dev()
238 	snd->filp = filp_open(fn_cap, O_RDONLY, 0);  in gaudio_open_snd_dev()
239 	if (IS_ERR(snd->filp)) {  in gaudio_open_snd_dev()
240 		ERROR(card, "No such PCM capture device: %s\n", fn_cap);  in gaudio_open_snd_dev()
241 		snd->substream = NULL;  in gaudio_open_snd_dev()
242 		snd->card = NULL;  in gaudio_open_snd_dev()
243 		snd->filp = NULL;  in gaudio_open_snd_dev()
245 		pcm_file = snd->filp->private_data;  in gaudio_open_snd_dev()
246 		snd->substream = pcm_file->substream;  in gaudio_open_snd_dev()
247 		snd->card = card;  in gaudio_open_snd_dev()
261 	snd = &gau->control;  in gaudio_close_snd_dev()
262 	if (snd->filp)  in gaudio_close_snd_dev()
263 		filp_close(snd->filp, NULL);  in gaudio_close_snd_dev()
266 	snd = &gau->playback;  in gaudio_close_snd_dev()
267 	if (snd->filp)  in gaudio_close_snd_dev()
268 		filp_close(snd->filp, NULL);  in gaudio_close_snd_dev()
270 	/* Close PCM capture device and setup substream */  in gaudio_close_snd_dev()
271 	snd = &gau->capture;  in gaudio_close_snd_dev()
272 	if (snd->filp)  in gaudio_close_snd_dev()
273 		filp_close(snd->filp, NULL);  in gaudio_close_snd_dev()
279  * gaudio_setup - setup ALSA interface and preparing for USB transfer
298  * gaudio_cleanup - remove ALSA device interface