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rtc-pcf8583: Check for i2c adapter functionality 

Not all i2c adapters support I2C-level messaging.  Check that the adapter
does before probing for a PCF8583 chip, as the driver makes use of
i2c_transfer and i2c_master_send.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
hifive-unleashed-5.1
Jean Delvare 2007-10-16 01:28:18 -07:00 committed by Linus Torvalds
parent a95e23a27b
commit c018664c51
1 changed files with 3 additions and 0 deletions
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3
drivers/rtc/rtc-pcf8583.c
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@ -332,6 +332,9 @@ static int pcf8583_probe(struct i2c_adapter *adap, int addr, int kind)
}
};
if (!i2c_check_functionality(adap, I2C_FUNC_I2C))
return 0;
pcf = kzalloc(sizeof(*pcf), GFP_KERNEL);
if (!pcf)
return -ENOMEM;