From: Jaroslav Kysela perex@perex.cz
As mentined by Takashi Sakamoto, the system-wide alsa-lib configuration may override the standard device declarations. This patch use the private alsa-lib configuration to set the predictable environment.
Signed-off-by: Jaroslav Kysela perex@perex.cz Link: https://lore.kernel.org/r/20211208095209.1772296-1-perex@perex.cz [Restructure version test to keep the preprocessor happy -- broonie] Reviewed-by: Shuah Khan skhan@linuxfoundation.org Signed-off-by: Mark Brown broonie@kernel.org --- tools/testing/selftests/alsa/mixer-test.c | 56 ++++++++++++++++++++++- 1 file changed, 55 insertions(+), 1 deletion(-)
diff --git a/tools/testing/selftests/alsa/mixer-test.c b/tools/testing/selftests/alsa/mixer-test.c index f65a9046e708..b798a76f6825 100644 --- a/tools/testing/selftests/alsa/mixer-test.c +++ b/tools/testing/selftests/alsa/mixer-test.c @@ -46,22 +46,74 @@ struct ctl_data { struct ctl_data *next; };
+static const char *alsa_config = +"ctl.hw {\n" +" @args [ CARD ]\n" +" @args.CARD.type string\n" +" type hw\n" +" card $CARD\n" +"}\n" +; + int num_cards = 0; int num_controls = 0; struct card_data *card_list = NULL; struct ctl_data *ctl_list = NULL;
+#ifdef SND_LIB_VER +#if SND_LIB_VERSION >= SND_LIB_VER(1, 2, 6) +#define LIB_HAS_LOAD_STRING +#endif +#endif + +#ifndef LIB_HAS_LOAD_STRING +int snd_config_load_string(snd_config_t **config, const char *s, size_t size) +{ + snd_input_t *input; + snd_config_t *dst; + int err; + + assert(config && s); + if (size == 0) + size = strlen(s); + err = snd_input_buffer_open(&input, s, size); + if (err < 0) + return err; + err = snd_config_top(&dst); + if (err < 0) { + snd_input_close(input); + return err; + } + err = snd_config_load(dst, input); + snd_input_close(input); + if (err < 0) { + snd_config_delete(dst); + return err; + } + *config = dst; + return 0; +} +#endif + void find_controls(void) { char name[32]; int card, ctl, err; struct card_data *card_data; struct ctl_data *ctl_data; + snd_config_t *config;
card = -1; if (snd_card_next(&card) < 0 || card < 0) return;
+ err = snd_config_load_string(&config, alsa_config, strlen(alsa_config)); + if (err < 0) { + ksft_print_msg("Unable to parse custom alsa-lib configuration: %s\n", + snd_strerror(err)); + ksft_exit_fail(); + } + while (card >= 0) { sprintf(name, "hw:%d", card);
@@ -69,7 +121,7 @@ void find_controls(void) if (!card_data) ksft_exit_fail_msg("Out of memory\n");
- err = snd_ctl_open(&card_data->handle, name, 0); + err = snd_ctl_open_lconf(&card_data->handle, name, 0, config); if (err < 0) { ksft_print_msg("Failed to get hctl for card %d: %s\n", card, snd_strerror(err)); @@ -137,6 +189,8 @@ void find_controls(void) break; } } + + snd_config_delete(config); }
/*