[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>

1 files changed, 7 insertions, 6 deletions

diff --git a/drivers/media/usb/em28xx/em28xx-dvb.c b/drivers/media/usb/em28xx/em28xx-dvb.c
index 913e5227897a..13ae821949e9 100644
--- a/drivers/media/usb/em28xx/em28xx-dvb.c
+++ b/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
 }