From: Wolfram Sang Date: Mon, 23 Jul 2018 20:26:11 +0000 (+0200) Subject: i2c: stu300: use core to detect 'no zero length' quirk X-Git-Tag: v4.19-rc1~69^2~17 X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=5314355a916aea235968d4c51710a65b7c9811ef;p=uclinux-h8%2Flinux.git i2c: stu300: use core to detect 'no zero length' quirk And don't reimplement in the driver. Signed-off-by: Wolfram Sang Reviewed-by: Linus Walleij Signed-off-by: Wolfram Sang --- diff --git a/drivers/i2c/busses/i2c-stu300.c b/drivers/i2c/busses/i2c-stu300.c index fce52bdab2b7..5503fa171df0 100644 --- a/drivers/i2c/busses/i2c-stu300.c +++ b/drivers/i2c/busses/i2c-stu300.c @@ -673,12 +673,6 @@ static int stu300_xfer_msg(struct i2c_adapter *adap, msg->addr, msg->len, msg->flags, stop); } - /* Zero-length messages are not supported by this hardware */ - if (msg->len == 0) { - ret = -EINVAL; - goto exit_disable; - } - /* * For some reason, sending the address sometimes fails when running * on the 13 MHz clock. No interrupt arrives. This is a work around, @@ -863,6 +857,10 @@ static const struct i2c_algorithm stu300_algo = { .functionality = stu300_func, }; +static const struct i2c_adapter_quirks stu300_quirks = { + .flags = I2C_AQ_NO_ZERO_LEN, +}; + static int stu300_probe(struct platform_device *pdev) { struct stu300_dev *dev; @@ -920,6 +918,8 @@ static int stu300_probe(struct platform_device *pdev) adap->algo = &stu300_algo; adap->dev.parent = &pdev->dev; adap->dev.of_node = pdev->dev.of_node; + adap->quirks = &stu300_quirks; + i2c_set_adapdata(adap, dev); /* i2c device drivers may be active on return from add_adapter() */