drivers/net/wireless/broadcom/brcm80211/brcmutil/d11.c

File Facts

System

Linux kernel

Corpus path

drivers/net/wireless/broadcom/brcm80211/brcmutil/d11.c

Extension

.c

Size

6117 bytes

Lines

248

Domain

Driver Families

Bucket

drivers/net

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.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/module.h
• brcmu_utils.h
• brcmu_wifi.h
• brcmu_d11.h

Detected Declarations

• function Copyright
• function d11n_bw
• function brcmu_d11n_encchspec
• function d11ac_bw
• function brcmu_d11ac_encchspec
• function brcmu_d11n_decchspec
• function brcmu_d11ac_decchspec
• function brcmu_d11_attach
• export brcmu_d11_attach

Annotated Snippet

if (val == BRCMU_CHSPEC_D11N_SB_L) {
			ch->sb = BRCMU_CHAN_SB_L;
			ch->control_ch_num -= CH_10MHZ_APART;
		} else {
			ch->sb = BRCMU_CHAN_SB_U;
			ch->control_ch_num += CH_10MHZ_APART;
		}
		break;
	default:
		WARN_ONCE(1, "Invalid chanspec 0x%04x\n", ch->chspec);
		break;
	}

	switch (ch->chspec & BRCMU_CHSPEC_D11N_BND_MASK) {
	case BRCMU_CHSPEC_D11N_BND_5G:
		ch->band = BRCMU_CHAN_BAND_5G;
		break;
	case BRCMU_CHSPEC_D11N_BND_2G:
		ch->band = BRCMU_CHAN_BAND_2G;
		break;
	default:
		WARN_ONCE(1, "Invalid chanspec 0x%04x\n", ch->chspec);
		break;
	}
}

static void brcmu_d11ac_decchspec(struct brcmu_chan *ch)
{
	u16 val;

	ch->chnum = (u8)(ch->chspec & BRCMU_CHSPEC_CH_MASK);
	ch->control_ch_num = ch->chnum;

	switch (ch->chspec & BRCMU_CHSPEC_D11AC_BW_MASK) {
	case BRCMU_CHSPEC_D11AC_BW_20:
		ch->bw = BRCMU_CHAN_BW_20;
		ch->sb = BRCMU_CHAN_SB_NONE;
		break;
	case BRCMU_CHSPEC_D11AC_BW_40:
		ch->bw = BRCMU_CHAN_BW_40;
		val = ch->chspec & BRCMU_CHSPEC_D11AC_SB_MASK;
		if (val == BRCMU_CHSPEC_D11AC_SB_L) {
			ch->sb = BRCMU_CHAN_SB_L;
			ch->control_ch_num -= CH_10MHZ_APART;
		} else if (val == BRCMU_CHSPEC_D11AC_SB_U) {
			ch->sb = BRCMU_CHAN_SB_U;
			ch->control_ch_num += CH_10MHZ_APART;
		} else {
			WARN_ONCE(1, "Invalid chanspec 0x%04x\n", ch->chspec);
		}
		break;
	case BRCMU_CHSPEC_D11AC_BW_80:
		ch->bw = BRCMU_CHAN_BW_80;
		ch->sb = brcmu_maskget16(ch->chspec, BRCMU_CHSPEC_D11AC_SB_MASK,
					 BRCMU_CHSPEC_D11AC_SB_SHIFT);
		switch (ch->sb) {
		case BRCMU_CHAN_SB_LL:
			ch->control_ch_num -= CH_30MHZ_APART;
			break;
		case BRCMU_CHAN_SB_LU:
			ch->control_ch_num -= CH_10MHZ_APART;
			break;
		case BRCMU_CHAN_SB_UL:
			ch->control_ch_num += CH_10MHZ_APART;
			break;
		case BRCMU_CHAN_SB_UU:
			ch->control_ch_num += CH_30MHZ_APART;
			break;
		default:
			WARN_ONCE(1, "Invalid chanspec 0x%04x\n", ch->chspec);
			break;
		}
		break;
	case BRCMU_CHSPEC_D11AC_BW_160:
		ch->bw = BRCMU_CHAN_BW_160;
		ch->sb = brcmu_maskget16(ch->chspec, BRCMU_CHSPEC_D11AC_SB_MASK,
					 BRCMU_CHSPEC_D11AC_SB_SHIFT);
		switch (ch->sb) {
		case BRCMU_CHAN_SB_LLL:
			ch->control_ch_num -= CH_70MHZ_APART;
			break;
		case BRCMU_CHAN_SB_LLU:
			ch->control_ch_num -= CH_50MHZ_APART;
			break;
		case BRCMU_CHAN_SB_LUL:
			ch->control_ch_num -= CH_30MHZ_APART;
			break;
		case BRCMU_CHAN_SB_LUU:
			ch->control_ch_num -= CH_10MHZ_APART;
			break;

Annotation

• Immediate include surface: `linux/module.h`, `brcmu_utils.h`, `brcmu_wifi.h`, `brcmu_d11.h`.
• Detected declarations: `function Copyright`, `function d11n_bw`, `function brcmu_d11n_encchspec`, `function d11ac_bw`, `function brcmu_d11ac_encchspec`, `function brcmu_d11n_decchspec`, `function brcmu_d11ac_decchspec`, `function brcmu_d11_attach`, `export brcmu_d11_attach`.
• Atlas domain: Driver Families / drivers/net.
• Implementation status: integration implementation candidate.

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.