i2c: algo: bit: add flag to whitelist atomic transfers
Use the new xfer_atomic callback to check a newly introduced flag to whitelist atomic transfers. This will report configurations which worked accidently. Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
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@ -603,6 +603,23 @@ bailout:
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return ret;
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}
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/*
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* We print a warning when we are not flagged to support atomic transfers but
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* will try anyhow. That's what the I2C core would do as well. Sadly, we can't
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* modify the algorithm struct at probe time because this struct is exported
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* 'const'.
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*/
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static int bit_xfer_atomic(struct i2c_adapter *i2c_adap, struct i2c_msg msgs[],
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int num)
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{
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struct i2c_algo_bit_data *adap = i2c_adap->algo_data;
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if (!adap->can_do_atomic)
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dev_warn(&i2c_adap->dev, "not flagged for atomic transfers\n");
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return bit_xfer(i2c_adap, msgs, num);
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}
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static u32 bit_func(struct i2c_adapter *adap)
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{
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return I2C_FUNC_I2C | I2C_FUNC_NOSTART | I2C_FUNC_SMBUS_EMUL |
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@ -615,8 +632,9 @@ static u32 bit_func(struct i2c_adapter *adap)
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/* -----exported algorithm data: ------------------------------------- */
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const struct i2c_algorithm i2c_bit_algo = {
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.master_xfer = bit_xfer,
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.functionality = bit_func,
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.master_xfer = bit_xfer,
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.master_xfer_atomic = bit_xfer_atomic,
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.functionality = bit_func,
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};
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EXPORT_SYMBOL(i2c_bit_algo);
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@ -33,6 +33,7 @@ struct i2c_algo_bit_data {
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minimum 5 us for standard-mode I2C and SMBus,
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maximum 50 us for SMBus */
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int timeout; /* in jiffies */
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bool can_do_atomic; /* callbacks don't sleep, we can be atomic */
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};
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int i2c_bit_add_bus(struct i2c_adapter *);
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