drivers/media/i2c/max2175.c

Source file repositories/reference/linux-study-clean/drivers/media/i2c/max2175.c

File Facts

System: Linux kernel
Corpus path: drivers/media/i2c/max2175.c
Extension: .c
Size: 38545 bytes
Lines: 1442
Domain: Driver Families
Bucket: drivers/media
Inferred role: Driver Families: implementation source
Status: source 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.
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/clk.h
linux/delay.h
linux/errno.h
linux/i2c.h
linux/kernel.h
linux/math64.h
linux/max2175.h
linux/module.h
linux/of.h
linux/regmap.h
linux/slab.h
media/v4l2-ctrls.h
media/v4l2-device.h
max2175.h

Detected Declarations

struct max2175_rxmode
struct max2175_reg_map
struct max2175
function max2175_get_bitval
function max2175_read
function max2175_write
function max2175_read_bits
function max2175_write_bits
function max2175_write_bit
function max2175_poll_timeout
function max2175_poll_csm_ready
function max2175_band_from_freq
function max2175_i2s_enable
function max2175_set_filter_coeffs
function max2175_load_fmeu_1p2
function max2175_load_dab_1p2
function max2175_load_fmna_1p0
function max2175_load_fmna_2p0
function max2175_set_bbfilter
function max2175_set_csm_mode
function max2175_csm_action
function max2175_set_lo_freq
function max2175_round_closest
function max2175_set_nco_freq
function max2175_set_rf_freq_non_am_bands
function max2175_set_rf_freq
function max2175_tune_rf_freq
function max2175_set_hsls
function max2175_set_eu_rx_mode
function max2175_set_na_rx_mode
function max2175_set_rx_mode
function max2175_rx_mode_from_freq
function max2175_freq_rx_mode_valid
function max2175_load_adc_presets
function max2175_init_power_manager
function max2175_recalibrate_adc
function max2175_read_rom
function max2175_load_from_rom
function max2175_load_full_fm_eu_1p0
function max2175_load_full_fm_na_1p0
function max2175_core_init
function max2175_s_ctrl_rx_mode
function max2175_s_ctrl
function max2175_get_lna_gain
function max2175_g_volatile_ctrl
function max2175_set_freq_and_mode
function max2175_s_frequency
function max2175_g_frequency

Annotated Snippet

struct max2175_rxmode {
	enum max2175_band band;		/* Associated band */
	u32 freq;			/* Default freq in Hz */
	u8 i2s_word_size;		/* Bit value */
};

/* Register map to define preset values */
struct max2175_reg_map {
	u8 idx;				/* Register index */
	u8 val;				/* Register value */
};

static const struct max2175_rxmode eu_rx_modes[] = {
	/* EU modes */
	[MAX2175_EU_FM_1_2] = { MAX2175_BAND_FM, 98256000, 1 },
	[MAX2175_DAB_1_2]   = { MAX2175_BAND_VHF, 182640000, 0 },
};

static const struct max2175_rxmode na_rx_modes[] = {
	/* NA modes */
	[MAX2175_NA_FM_1_0] = { MAX2175_BAND_FM, 98255520, 1 },
	[MAX2175_NA_FM_2_0] = { MAX2175_BAND_FM, 98255520, 6 },
};

/*
 * Preset values:
 * Based on Maxim MAX2175 Register Table revision: 130p10
 */
static const u8 full_fm_eu_1p0[] = {
	0x15, 0x04, 0xb8, 0xe3, 0x35, 0x18, 0x7c, 0x00,
	0x00, 0x7d, 0x40, 0x08, 0x70, 0x7a, 0x88, 0x91,
	0x61, 0x61, 0x61, 0x61, 0x5a, 0x0f, 0x34, 0x1c,
	0x14, 0x88, 0x33, 0x02, 0x00, 0x09, 0x00, 0x65,
	0x9f, 0x2b, 0x80, 0x00, 0x95, 0x05, 0x2c, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x40,
	0x4a, 0x08, 0xa8, 0x0e, 0x0e, 0x2f, 0x7e, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0xab, 0x5e, 0xa9,
	0xae, 0xbb, 0x57, 0x18, 0x3b, 0x03, 0x3b, 0x64,
	0x40, 0x60, 0x00, 0x2a, 0xbf, 0x3f, 0xff, 0x9f,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0a, 0x00,
	0xff, 0xfc, 0xef, 0x1c, 0x40, 0x00, 0x00, 0x02,
	0x00, 0x00, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0xac, 0x40, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x75, 0x00, 0x00,
	0x00, 0x47, 0x00, 0x00, 0x11, 0x3f, 0x22, 0x00,
	0xf1, 0x00, 0x41, 0x03, 0xb0, 0x00, 0x00, 0x00,
	0x1b,
};

static const u8 full_fm_na_1p0[] = {
	0x13, 0x08, 0x8d, 0xc0, 0x35, 0x18, 0x7d, 0x3f,
	0x7d, 0x75, 0x40, 0x08, 0x70, 0x7a, 0x88, 0x91,
	0x61, 0x61, 0x61, 0x61, 0x5c, 0x0f, 0x34, 0x1c,
	0x14, 0x88, 0x33, 0x02, 0x00, 0x01, 0x00, 0x65,
	0x9f, 0x2b, 0x80, 0x00, 0x95, 0x05, 0x2c, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x40,
	0x4a, 0x08, 0xa8, 0x0e, 0x0e, 0xaf, 0x7e, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0xab, 0x5e, 0xa9,
	0xae, 0xbb, 0x57, 0x18, 0x3b, 0x03, 0x3b, 0x64,
	0x40, 0x60, 0x00, 0x2a, 0xbf, 0x3f, 0xff, 0x9f,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0a, 0x00,
	0xff, 0xfc, 0xef, 0x1c, 0x40, 0x00, 0x00, 0x02,
	0x00, 0x00, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0xa6, 0x40, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x75, 0x00, 0x00,
	0x00, 0x35, 0x00, 0x00, 0x11, 0x3f, 0x22, 0x00,
	0xf1, 0x00, 0x41, 0x03, 0xb0, 0x00, 0x00, 0x00,
	0x1b,
};

/* DAB1.2 settings */
static const struct max2175_reg_map dab12_map[] = {
	{ 0x01, 0x13 }, { 0x02, 0x0d }, { 0x03, 0x15 }, { 0x04, 0x55 },
	{ 0x05, 0x0a }, { 0x06, 0xa0 }, { 0x07, 0x40 }, { 0x08, 0x00 },
	{ 0x09, 0x00 }, { 0x0a, 0x7d }, { 0x0b, 0x4a }, { 0x0c, 0x28 },
	{ 0x0e, 0x43 }, { 0x0f, 0xb5 }, { 0x10, 0x31 }, { 0x11, 0x9e },
	{ 0x12, 0x68 }, { 0x13, 0x9e }, { 0x14, 0x68 }, { 0x15, 0x58 },
	{ 0x16, 0x2f }, { 0x17, 0x3f }, { 0x18, 0x40 }, { 0x1a, 0x88 },
	{ 0x1b, 0xaa }, { 0x1c, 0x9a }, { 0x1d, 0x00 }, { 0x1e, 0x00 },
	{ 0x23, 0x80 }, { 0x24, 0x00 }, { 0x25, 0x00 }, { 0x26, 0x00 },
	{ 0x27, 0x00 }, { 0x32, 0x08 }, { 0x33, 0xf8 }, { 0x36, 0x2d },
	{ 0x37, 0x7e }, { 0x55, 0xaf }, { 0x56, 0x3f }, { 0x57, 0xf8 },
	{ 0x58, 0x99 }, { 0x76, 0x00 }, { 0x77, 0x00 }, { 0x78, 0x02 },
	{ 0x79, 0x40 }, { 0x82, 0x00 }, { 0x83, 0x00 }, { 0x85, 0x00 },
	{ 0x86, 0x20 },
};

/* EU FM 1.2 settings */

Annotation

Immediate include surface: `linux/clk.h`, `linux/delay.h`, `linux/errno.h`, `linux/i2c.h`, `linux/kernel.h`, `linux/math64.h`, `linux/max2175.h`, `linux/module.h`.
Detected declarations: `struct max2175_rxmode`, `struct max2175_reg_map`, `struct max2175`, `function max2175_get_bitval`, `function max2175_read`, `function max2175_write`, `function max2175_read_bits`, `function max2175_write_bits`, `function max2175_write_bit`, `function max2175_poll_timeout`.
Atlas domain: Driver Families / drivers/media.
Implementation status: source 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.