[media] dvb: LNA implementation changes

* use dvb property cache
* implement get (thus API minor++)
* PCTV 290e: 1=LNA ON, all the other values LNA OFF
  Also fix PCTV 290e LNA comment, it is disabled by default
Hans and Mauro proposed use of cache implementation of get as they
were planning to extend LNA usage for analog side too.

Reported-by: Hans Verkuil <hverkuil@xs4all.nl>
Reported-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Signed-off-by: Antti Palosaari <crope@iki.fi>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/dvb-core/dvb_frontend.c

@@ -966,6 +966,8 @@ static int dvb_frontend_clear_cache(struct dvb_frontend *fe)
 		break;
 	}
 
+	c->lna = LNA_AUTO;
+
 	return 0;
 }
 
@@ -1054,6 +1056,8 @@ static struct dtv_cmds_h dtv_cmds[DTV_MAX_COMMAND + 1] = {
 	_DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_B, 0, 0),
 	_DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_C, 0, 0),
 	_DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_D, 0, 0),
+
+	_DTV_CMD(DTV_LNA, 0, 0),
 };
 
 static void dtv_property_dump(struct dvb_frontend *fe, struct dtv_property *tvp)
@@ -1440,6 +1444,10 @@ static int dtv_property_process_get(struct dvb_frontend *fe,
 		tvp->u.data = fe->dtv_property_cache.atscmh_sccc_code_mode_d;
 		break;
 
+	case DTV_LNA:
+		tvp->u.data = c->lna;
+		break;
+
 	default:
 		return -EINVAL;
 	}
@@ -1731,10 +1739,6 @@ static int dtv_property_process_set(struct dvb_frontend *fe,
 	case DTV_INTERLEAVING:
 		c->interleaving = tvp->u.data;
 		break;
-	case DTV_LNA:
-		if (fe->ops.set_lna)
-			r = fe->ops.set_lna(fe, tvp->u.data);
-		break;
 
 	/* ISDB-T Support here */
 	case DTV_ISDBT_PARTIAL_RECEPTION:
@@ -1806,6 +1810,12 @@ static int dtv_property_process_set(struct dvb_frontend *fe,
 		fe->dtv_property_cache.atscmh_rs_frame_ensemble = tvp->u.data;
 		break;
 
+	case DTV_LNA:
+		c->lna = tvp->u.data;
+		if (fe->ops.set_lna)
+			r = fe->ops.set_lna(fe);
+		break;
+
 	default:
 		return -EINVAL;
 	}

drivers/media/dvb-core/dvb_frontend.h

@@ -303,7 +303,7 @@ struct dvb_frontend_ops {
 	int (*dishnetwork_send_legacy_command)(struct dvb_frontend* fe, unsigned long cmd);
 	int (*i2c_gate_ctrl)(struct dvb_frontend* fe, int enable);
 	int (*ts_bus_ctrl)(struct dvb_frontend* fe, int acquire);
-	int (*set_lna)(struct dvb_frontend *, int);
+	int (*set_lna)(struct dvb_frontend *);
 
 	/* These callbacks are for devices that implement their own
 	 * tuning algorithms, rather than a simple swzigzag
@@ -391,6 +391,8 @@ struct dtv_frontend_properties {
 	u8			atscmh_sccc_code_mode_b;
 	u8			atscmh_sccc_code_mode_c;
 	u8			atscmh_sccc_code_mode_d;
+
+	u32			lna;
 };
 
 struct dvb_frontend {

drivers/media/usb/em28xx/em28xx-dvb.c

@@ -574,18 +574,19 @@ static void pctv_520e_init(struct em28xx *dev)
 		i2c_master_send(&dev->i2c_client, regs[i].r, regs[i].len);
 };
 
-static int em28xx_pctv_290e_set_lna(struct dvb_frontend *fe, int val)
+static int em28xx_pctv_290e_set_lna(struct dvb_frontend *fe)
 {
+	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 	struct em28xx *dev = fe->dvb->priv;
 #ifdef CONFIG_GPIOLIB
 	struct em28xx_dvb *dvb = dev->dvb;
 	int ret;
 	unsigned long flags;
 
-	if (val)
-		flags = GPIOF_OUT_INIT_LOW;
+	if (c->lna == 1)
+		flags = GPIOF_OUT_INIT_HIGH; /* enable LNA */
 	else
-		flags = GPIOF_OUT_INIT_HIGH;
+		flags = GPIOF_OUT_INIT_LOW; /* disable LNA */
 
 	ret = gpio_request_one(dvb->lna_gpio, flags, NULL);
 	if (ret)
@@ -595,8 +596,8 @@ static int em28xx_pctv_290e_set_lna(struct dvb_frontend *fe, int val)
 
 	return ret;
 #else
-	dev_warn(&dev->udev->dev, "%s: LNA control is disabled\n",
-			KBUILD_MODNAME);
+	dev_warn(&dev->udev->dev, "%s: LNA control is disabled (lna=%u)\n",
+			KBUILD_MODNAME, c->lna);
 	return 0;
 #endif
 }

include/linux/dvb/version.h

@@ -24,6 +24,6 @@
 #define _DVBVERSION_H_
 
 #define DVB_API_VERSION 5
-#define DVB_API_VERSION_MINOR 8
+#define DVB_API_VERSION_MINOR 9
 
 #endif /*_DVBVERSION_H_*/