[media] rtl2830: prevent .read_status() when sleeping

Hardware is not accessible when device is sleeping.
Preventing such IOCTLs when sleep should be job of DVB CORE...

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

3 files changed, 17 insertions, 5 deletions

diff --git a/drivers/media/dvb/dvb-usb/rtl28xxu.c b/drivers/media/dvb/dvb-usb/rtl28xxu.c
index b5785fa36220..07597c53d07b 100644
--- a/drivers/media/dvb/dvb-usb/rtl28xxu.c
+++ b/drivers/media/dvb/dvb-usb/rtl28xxu.c
@@ -608,11 +608,6 @@ static int rtl28xxu_power_ctrl(struct dvb_usb_device *d, int onoff)
                 sys0 = sys0 & 0x0f;
                 sys0 |= 0xe0;
         } else {
-                /*
-                 * FIXME: Use .fe_ioctl_override() to prevent demod
-                 * IOCTLs in case of device is powered off. Or change
-                 * RTL2830 demod not perform requestesd IOCTL & IO when sleep.
-                 */
                 gpio &= (~0x01); /* GPIO0 = 0 */
                 gpio |= 0x10; /* GPIO4 = 1 */
                 sys0 = sys0 & (~0xc0);
diff --git a/drivers/media/dvb/frontends/rtl2830.c b/drivers/media/dvb/frontends/rtl2830.c
index f036701c12ee..f971d949b2af 100644
--- a/drivers/media/dvb/frontends/rtl2830.c
+++ b/drivers/media/dvb/frontends/rtl2830.c
@@ -273,12 +273,21 @@ static int rtl2830_init(struct dvb_frontend *fe)
         if (ret)
                 goto err;
 
+        priv->sleeping = false;
+
         return ret;
 err:
         dbg("%s: failed=%d", __func__, ret);
         return ret;
 }
 
+static int rtl2830_sleep(struct dvb_frontend *fe)
+{
+        struct rtl2830_priv *priv = fe->demodulator_priv;
+        priv->sleeping = true;
+        return 0;
+}
+
 int rtl2830_get_tune_settings(struct dvb_frontend *fe,
         struct dvb_frontend_tune_settings *s)
 {
@@ -372,6 +381,9 @@ static int rtl2830_read_status(struct dvb_frontend *fe, fe_status_t *status)
         u8 tmp;
         *status = 0;
 
+        if (priv->sleeping)
+                return 0;
+
         ret = rtl2830_rd_reg_mask(priv, 0x351, &tmp, 0x78); /* [6:3] */
         if (ret)
                 goto err;
@@ -498,6 +510,8 @@ struct dvb_frontend *rtl2830_attach(const struct rtl2830_config *cfg,
                 goto err;
         }
 
+        priv->sleeping = true;
+
         return &priv->fe;
 err:
         dbg("%s: failed=%d", __func__, ret);
@@ -530,6 +544,7 @@ static struct dvb_frontend_ops rtl2830_ops = {
         .release = rtl2830_release,
 
         .init = rtl2830_init,
+        .sleep = rtl2830_sleep,
 
         .get_tune_settings = rtl2830_get_tune_settings,
 
diff --git a/drivers/media/dvb/frontends/rtl2830_priv.h b/drivers/media/dvb/frontends/rtl2830_priv.h
index 49de01dd5e83..4a464761b5b8 100644
--- a/drivers/media/dvb/frontends/rtl2830_priv.h
+++ b/drivers/media/dvb/frontends/rtl2830_priv.h
@@ -43,6 +43,8 @@ struct rtl2830_priv {
         struct rtl2830_config cfg;
         struct i2c_adapter tuner_i2c_adapter;
 
+        bool sleeping;
+
         u8 page; /* active register page */
 };