// SPDX-License-Identifier: GPL-2.0-only /* * HDMI Channel map support helpers */ #include <linux/module.h> #include <sound/control.h> #include <sound/tlv.h> #include <sound/hda_chmap.h> /* * CEA speaker placement: * * FLH FCH FRH * FLW FL FLC FC FRC FR FRW * * LFE * TC * * RL RLC RC RRC RR * * The Left/Right Surround channel _notions_ LS/RS in SMPTE 320M corresponds to * CEA RL/RR; The SMPTE channel _assignment_ C/LFE is swapped to CEA LFE/FC. */ enum cea_speaker_placement { … }; static const char * const cea_speaker_allocation_names[] = …; /* * ELD SA bits in the CEA Speaker Allocation data block */ static const int eld_speaker_allocation_bits[] = …; /* * ALSA sequence is: * * surround40 surround41 surround50 surround51 surround71 * ch0 front left = = = = * ch1 front right = = = = * ch2 rear left = = = = * ch3 rear right = = = = * ch4 LFE center center center * ch5 LFE LFE * ch6 side left * ch7 side right * * surround71 = {FL, FR, RLC, RRC, FC, LFE, RL, RR} */ static int hdmi_channel_mapping[0x32][8] = …; /* * This is an ordered list! * * The preceding ones have better chances to be selected by * hdmi_channel_allocation(). */ static struct hdac_cea_channel_speaker_allocation channel_allocations[] = …; static int hdmi_pin_set_slot_channel(struct hdac_device *codec, hda_nid_t pin_nid, int asp_slot, int channel) { … } static int hdmi_pin_get_slot_channel(struct hdac_device *codec, hda_nid_t pin_nid, int asp_slot) { … } static int hdmi_get_channel_count(struct hdac_device *codec, hda_nid_t cvt_nid) { … } static void hdmi_set_channel_count(struct hdac_device *codec, hda_nid_t cvt_nid, int chs) { … } /* * Channel mapping routines */ /* * Compute derived values in channel_allocations[]. */ static void init_channel_allocations(void) { … } static int get_channel_allocation_order(int ca) { … } void snd_hdac_print_channel_allocation(int spk_alloc, char *buf, int buflen) { … } EXPORT_SYMBOL_GPL(…); /* * The transformation takes two steps: * * eld->spk_alloc => (eld_speaker_allocation_bits[]) => spk_mask * spk_mask => (channel_allocations[]) => ai->CA * * TODO: it could select the wrong CA from multiple candidates. */ static int hdmi_channel_allocation_spk_alloc_blk(struct hdac_device *codec, int spk_alloc, int channels) { … } static void hdmi_debug_channel_mapping(struct hdac_chmap *chmap, hda_nid_t pin_nid) { … } static void hdmi_std_setup_channel_mapping(struct hdac_chmap *chmap, hda_nid_t pin_nid, bool non_pcm, int ca) { … } struct channel_map_table { … }; static struct channel_map_table map_tables[] = …; /* from ALSA API channel position to speaker bit mask */ int snd_hdac_chmap_to_spk_mask(unsigned char c) { … } EXPORT_SYMBOL_GPL(…); /* from ALSA API channel position to CEA slot */ static int to_cea_slot(int ordered_ca, unsigned char pos) { … } /* from speaker bit mask to ALSA API channel position */ int snd_hdac_spk_to_chmap(int spk) { … } EXPORT_SYMBOL_GPL(…); /* from CEA slot to ALSA API channel position */ static int from_cea_slot(int ordered_ca, unsigned char slot) { … } /* get the CA index corresponding to the given ALSA API channel map */ static int hdmi_manual_channel_allocation(int chs, unsigned char *map) { … } /* set up the channel slots for the given ALSA API channel map */ static int hdmi_manual_setup_channel_mapping(struct hdac_chmap *chmap, hda_nid_t pin_nid, int chs, unsigned char *map, int ca) { … } /* store ALSA API channel map from the current default map */ static void hdmi_setup_fake_chmap(unsigned char *map, int ca) { … } void snd_hdac_setup_channel_mapping(struct hdac_chmap *chmap, hda_nid_t pin_nid, bool non_pcm, int ca, int channels, unsigned char *map, bool chmap_set) { … } EXPORT_SYMBOL_GPL(…); int snd_hdac_get_active_channels(int ca) { … } EXPORT_SYMBOL_GPL(…); struct hdac_cea_channel_speaker_allocation *snd_hdac_get_ch_alloc_from_ca(int ca) { … } EXPORT_SYMBOL_GPL(…); int snd_hdac_channel_allocation(struct hdac_device *hdac, int spk_alloc, int channels, bool chmap_set, bool non_pcm, unsigned char *map) { … } EXPORT_SYMBOL_GPL(…); /* * ALSA API channel-map control callbacks */ static int hdmi_chmap_ctl_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo) { … } static int hdmi_chmap_cea_alloc_validate_get_type(struct hdac_chmap *chmap, struct hdac_cea_channel_speaker_allocation *cap, int channels) { … } static void hdmi_cea_alloc_to_tlv_chmap(struct hdac_chmap *hchmap, struct hdac_cea_channel_speaker_allocation *cap, unsigned int *chmap, int channels) { … } static int spk_mask_from_spk_alloc(int spk_alloc) { … } static int hdmi_chmap_ctl_tlv(struct snd_kcontrol *kcontrol, int op_flag, unsigned int size, unsigned int __user *tlv) { … } static int hdmi_chmap_ctl_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) { … } /* a simple sanity check for input values to chmap kcontrol */ static int chmap_value_check(struct hdac_chmap *hchmap, const struct snd_ctl_elem_value *ucontrol) { … } static int hdmi_chmap_ctl_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) { … } static const struct hdac_chmap_ops chmap_ops = …; void snd_hdac_register_chmap_ops(struct hdac_device *hdac, struct hdac_chmap *chmap) { … } EXPORT_SYMBOL_GPL(…); int snd_hdac_add_chmap_ctls(struct snd_pcm *pcm, int pcm_idx, struct hdac_chmap *hchmap) { … } EXPORT_SYMBOL_GPL(…);
Codebase Browser
linux