mirror of https://gitee.com/openkylin/linux.git
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>
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cac2b0eb18
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@ -987,6 +987,28 @@ struct dvb_frontend *simple_tuner_attach(struct dvb_frontend *fe,
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return NULL;
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}
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/* If i2c_adap is set, check that the tuner is at the correct address.
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* Otherwise, if i2c_adap is NULL, the tuner will be programmed directly
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* by the digital demod via calc_regs.
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*/
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if (i2c_adap != NULL) {
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u8 b[1];
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struct i2c_msg msg = {
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.addr = i2c_addr, .flags = I2C_M_RD,
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.buf = b, .len = 1,
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};
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if (fe->ops.i2c_gate_ctrl)
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fe->ops.i2c_gate_ctrl(fe, 1);
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if (1 != i2c_transfer(i2c_adap, &msg, 1))
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tuner_warn("unable to probe %s, proceeding anyway.",
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tuners[type].name);
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if (fe->ops.i2c_gate_ctrl)
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fe->ops.i2c_gate_ctrl(fe, 0);
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}
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mutex_lock(&tuner_simple_list_mutex);
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instance = hybrid_tuner_request_state(struct tuner_simple_priv, priv,
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