sound/pci/trident/trident_main.c

File Facts

System

Linux kernel

Corpus path

sound/pci/trident/trident_main.c

Extension

.c

Size

119439 bytes

Lines

3842

Domain

Driver Families

Bucket

sound/pci

Inferred role

Driver Families: exported/initcall integration point

Status

integration implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

• Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.
• Exports symbols or registers init work; inspect boot/module ordering and who consumes the exported contract.
• Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
• Touches IRQ or DMA behavior; this matters for the representative real-device path.
• Allocates kernel memory; connect allocation flags and lifetime to context constraints.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/delay.h
• linux/init.h
• linux/interrupt.h
• linux/pci.h
• linux/slab.h
• linux/vmalloc.h
• linux/gameport.h
• linux/dma-mapping.h
• linux/export.h
• linux/io.h
• sound/core.h
• sound/info.h
• sound/control.h
• sound/tlv.h
• trident.h
• sound/asoundef.h

Detected Declarations

• function snd_trident_print_voice_regs
• function snd_trident_codec_read
• function snd_trident_codec_write
• function snd_trident_enable_eso
• function snd_trident_disable_eso
• function snd_trident_start_voice
• function snd_trident_stop_voice
• function snd_trident_allocate_pcm_channel
• function snd_trident_free_pcm_channel
• function snd_trident_allocate_synth_channel
• function snd_trident_free_synth_channel
• function snd_trident_write_voice_regs
• function snd_trident_write_cso_reg
• function snd_trident_write_eso_reg
• function snd_trident_write_vol_reg
• function snd_trident_write_pan_reg
• function snd_trident_write_rvol_reg
• function snd_trident_write_cvol_reg
• function snd_trident_convert_rate
• function snd_trident_convert_adc_rate
• function snd_trident_spurious_threshold
• function snd_trident_control_mode
• function snd_trident_allocate_pcm_mem
• function snd_trident_allocate_evoice
• function snd_trident_hw_params
• function snd_trident_hw_free
• function snd_trident_playback_prepare
• function snd_trident_capture_hw_params
• function snd_trident_capture_prepare
• function snd_trident_si7018_capture_hw_params
• function snd_trident_si7018_capture_hw_free
• function snd_trident_si7018_capture_prepare
• function snd_trident_foldback_prepare
• function snd_trident_spdif_hw_params
• function snd_trident_spdif_prepare
• function snd_trident_trigger
• function snd_trident_playback_pointer
• function snd_trident_capture_pointer
• function snd_trident_spdif_pointer
• function snd_trident_pcm_free_substream
• function snd_trident_playback_open
• function snd_trident_playback_close
• function snd_trident_spdif_open
• function snd_trident_spdif_close
• function scoped_guard
• function snd_trident_capture_open
• function snd_trident_capture_close
• function snd_trident_foldback_open

Annotated Snippet

if (!(trident->ChanMap[T4D_BANK_B] & (1 << idx))) {
			trident->ChanMap[T4D_BANK_B] |= 1 << idx;
			trident->ChanPCMcnt++;
			return idx + 32;
		}
	}
	return -1;
}

/*---------------------------------------------------------------------------
    void snd_trident_free_pcm_channel(int channel)
  
    Description: Free hardware channel in Bank B (32-63)
  
    Parameters :  trident - pointer to target device class for 4DWave.
	          channel - hardware channel number 0-63
  
    Return Value: none
  
  ---------------------------------------------------------------------------*/

static void snd_trident_free_pcm_channel(struct snd_trident *trident, int channel)
{
	if (channel < 32 || channel > 63)
		return;
	channel &= 0x1f;
	if (trident->ChanMap[T4D_BANK_B] & (1 << channel)) {
		trident->ChanMap[T4D_BANK_B] &= ~(1 << channel);
		trident->ChanPCMcnt--;
	}
}

/*---------------------------------------------------------------------------
    unsigned int snd_trident_allocate_synth_channel(void)
  
    Description: Allocate hardware channel in Bank A (0-31).
  
    Parameters :  trident - pointer to target device class for 4DWave.
  
    Return Value: hardware channel - 0-31 or -1 when no channel is available
  
  ---------------------------------------------------------------------------*/

static int snd_trident_allocate_synth_channel(struct snd_trident * trident)
{
	int idx;

	for (idx = 31; idx >= 0; idx--) {
		if (!(trident->ChanMap[T4D_BANK_A] & (1 << idx))) {
			trident->ChanMap[T4D_BANK_A] |= 1 << idx;
			trident->synth.ChanSynthCount++;
			return idx;
		}
	}
	return -1;
}

/*---------------------------------------------------------------------------
    void snd_trident_free_synth_channel( int channel )
  
    Description: Free hardware channel in Bank B (0-31).
  
    Parameters :  trident - pointer to target device class for 4DWave.
	          channel - hardware channel number 0-63
  
    Return Value: none
  
  ---------------------------------------------------------------------------*/

static void snd_trident_free_synth_channel(struct snd_trident *trident, int channel)
{
	if (channel < 0 || channel > 31)
		return;
	channel &= 0x1f;
	if (trident->ChanMap[T4D_BANK_A] & (1 << channel)) {
		trident->ChanMap[T4D_BANK_A] &= ~(1 << channel);
		trident->synth.ChanSynthCount--;
	}
}

/*---------------------------------------------------------------------------
   snd_trident_write_voice_regs
  
   Description: This routine will complete and write the 5 hardware channel
                registers to hardware.
  
   Parameters:  trident - pointer to target device class for 4DWave.
                voice - synthesizer voice structure
                Each register field.

Annotation

• Immediate include surface: `linux/delay.h`, `linux/init.h`, `linux/interrupt.h`, `linux/pci.h`, `linux/slab.h`, `linux/vmalloc.h`, `linux/gameport.h`, `linux/dma-mapping.h`.
• Detected declarations: `function snd_trident_print_voice_regs`, `function snd_trident_codec_read`, `function snd_trident_codec_write`, `function snd_trident_enable_eso`, `function snd_trident_disable_eso`, `function snd_trident_start_voice`, `function snd_trident_stop_voice`, `function snd_trident_allocate_pcm_channel`, `function snd_trident_free_pcm_channel`, `function snd_trident_allocate_synth_channel`.
• Atlas domain: Driver Families / sound/pci.
• Implementation status: integration implementation candidate.
• Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.
• IRQ or DMA behavior appears here, which is relevant to the selected PCIe/NVMe device path.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.