drivers/media/dvb-frontends/lnbp21.h

Source file repositories/reference/linux-study-clean/drivers/media/dvb-frontends/lnbp21.h

File Facts

System
Linux kernel
Corpus path
drivers/media/dvb-frontends/lnbp21.h
Extension
.h
Size
1598 bytes
Lines
58
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.

Dependency Surface

Detected Declarations

Annotated Snippet

#ifndef _LNBP21_H
#define _LNBP21_H

/* system register bits */
/* [RO] 0=OK; 1=over current limit flag */
#define LNBP21_OLF	0x01
/* [RO] 0=OK; 1=over temperature flag (150 C) */
#define LNBP21_OTF	0x02
/* [RW] 0=disable LNB power, enable loopthrough
	1=enable LNB power, disable loopthrough */
#define LNBP21_EN	0x04
/* [RW] 0=low voltage (13/14V, vert pol)
	1=high voltage (18/19V,horiz pol) */
#define LNBP21_VSEL	0x08
/* [RW] increase LNB voltage by 1V:
	0=13/18V; 1=14/19V */
#define LNBP21_LLC	0x10
/* [RW] 0=tone controlled by DSQIN pin
	1=tone enable, disable DSQIN */
#define LNBP21_TEN	0x20
/* [RW] current limit select:
	0:Iout=500-650mA Isc=300mA
	1:Iout=400-550mA Isc=200mA */
#define LNBP21_ISEL	0x40
/* [RW] short-circuit protect:
	0=pulsed (dynamic) curr limiting
	1=static curr limiting */
#define LNBP21_PCL	0x80

#include <linux/dvb/frontend.h>

#if IS_REACHABLE(CONFIG_DVB_LNBP21)
/* override_set and override_clear control which
 system register bits (above) to always set & clear */
extern struct dvb_frontend *lnbp21_attach(struct dvb_frontend *fe,
				struct i2c_adapter *i2c, u8 override_set,
				u8 override_clear);
#else
static inline struct dvb_frontend *lnbp21_attach(struct dvb_frontend *fe,
				struct i2c_adapter *i2c, u8 override_set,
				u8 override_clear)
{
	printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
	return NULL;
}
#endif

#endif

Annotation

Implementation Notes