1 files changed, 28 insertions, 6 deletions

diff --git a/drivers/media/dvb/frontends/lnbp21.h b/drivers/media/dvb/frontends/lnbp21.h
index 8fe094bd9689..fcdf1c650dde 100644
--- a/drivers/media/dvb/frontends/lnbp21.h
+++ b/drivers/media/dvb/frontends/lnbp21.h
@@ -28,26 +28,48 @@
 #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 defined(CONFIG_DVB_LNBP21) || (defined(CONFIG_DVB_LNBP21_MODULE) && defined(MODULE))
-/* 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);
+#if defined(CONFIG_DVB_LNBP21) || (defined(CONFIG_DVB_LNBP21_MODULE) \
+                                                        && defined(MODULE))
+/* 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)
+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 // CONFIG_DVB_LNBP21
+#endif
 
-#endif // _LNBP21_H
+#endif