[media] stv090x: Optional external lock routine

Card driver may supply its own lock routine now.

Signed-off-by: Oliver Endriss <[e-mail]>
Signed-off-by: Manu Abraham <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

drivers/media/dvb/frontends/stv090x.c

···
 	 * In case of any error, the lock is unlocked and exit within the
 	 * relevant operations themselves.
 	 */
-	if (enable)
-		mutex_lock(&state->internal->tuner_lock);
+	if (enable) {
+		if (state->config->tuner_i2c_lock)
+			state->config->tuner_i2c_lock(&state->frontend, 1);
+		else
+			mutex_lock(&state->internal->tuner_lock);
+	}
 
 	reg = STV090x_READ_DEMOD(state, I2CRPT);
 	if (enable) {
···
 			goto err;
 	}
 
-	if (!enable)
-		mutex_unlock(&state->internal->tuner_lock);
+	if (!enable) {
+		if (state->config->tuner_i2c_lock)
+			state->config->tuner_i2c_lock(&state->frontend, 0);
+		else
+			mutex_unlock(&state->internal->tuner_lock);
+	}
 
 	return 0;
 err:
 	dprintk(FE_ERROR, 1, "I/O error");
-	mutex_unlock(&state->internal->tuner_lock);
+	if (state->config->tuner_i2c_lock)
+		state->config->tuner_i2c_lock(&state->frontend, 0);
+	else
+		mutex_unlock(&state->internal->tuner_lock);
 	return -1;
 }
 

drivers/media/dvb/frontends/stv090x.h

···
 	int (*tuner_get_bbgain) (struct dvb_frontend *fe, u32 *gain);
 	int (*tuner_set_refclk)  (struct dvb_frontend *fe, u32 refclk);
 	int (*tuner_get_status) (struct dvb_frontend *fe, u32 *status);
+	void (*tuner_i2c_lock) (struct dvb_frontend *fe, int lock);
 };
 
 #if defined(CONFIG_DVB_STV090x) || (defined(CONFIG_DVB_STV090x_MODULE) && defined(MODULE))