V4L/DVB (7380): tuner-simple: warn if tuner can't be probed during attach

Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 22 insertions, 0 deletions

diff --git a/drivers/media/video/tuner-simple.c b/drivers/media/video/tuner-simple.c
index b95ed1f489a0..07007d67d45f 100644
--- a/drivers/media/video/tuner-simple.c
+++ b/drivers/media/video/tuner-simple.c
@@ -987,6 +987,28 @@ struct dvb_frontend *simple_tuner_attach(struct dvb_frontend *fe,
                 return NULL;
         }
 
+        /* If i2c_adap is set, check that the tuner is at the correct address.
+         * Otherwise, if i2c_adap is NULL, the tuner will be programmed directly
+         * by the digital demod via calc_regs.
+         */
+        if (i2c_adap != NULL) {
+                u8 b[1];
+                struct i2c_msg msg = {
+                        .addr = i2c_addr, .flags = I2C_M_RD,
+                        .buf = b, .len = 1,
+                };
+
+                if (fe->ops.i2c_gate_ctrl)
+                        fe->ops.i2c_gate_ctrl(fe, 1);
+
+                if (1 != i2c_transfer(i2c_adap, &msg, 1))
+                        tuner_warn("unable to probe %s, proceeding anyway.",
+                                   tuners[type].name);
+
+                if (fe->ops.i2c_gate_ctrl)
+                        fe->ops.i2c_gate_ctrl(fe, 0);
+        }
+
         mutex_lock(&tuner_simple_list_mutex);
 
         instance = hybrid_tuner_request_state(struct tuner_simple_priv, priv,