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authorWolfram Sang <wsa+renesas@sang-engineering.com>2018-07-23 23:26:05 +0300
committerWolfram Sang <wsa@the-dreams.de>2018-08-05 00:24:03 +0300
commitd9cfe2ce246845b9cca0ec1b881e826965893c58 (patch)
tree604dbf94802ce0e237e651cfb9bec2c6739827e8 /include/linux/i2c.h
parent5799c4b2f1dbc0166d9b1d94443deaafc6e7a070 (diff)
downloadlinux-d9cfe2ce246845b9cca0ec1b881e826965893c58.tar.xz
i2c: quirks: add zero length checks
Some adapters do not support a message length of 0. Add this as a quirk so drivers don't have to open code it. Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Tested-by: Jarkko Nikula <jarkko.nikula@linux.intel.com> Acked-by: Jarkko Nikula <jarkko.nikula@linux.intel.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'include/linux/i2c.h')
-rw-r--r--include/linux/i2c.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index bc8d42f8544f..2a98d0886d2e 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -661,6 +661,10 @@ struct i2c_adapter_quirks {
I2C_AQ_COMB_READ_SECOND | I2C_AQ_COMB_SAME_ADDR)
/* clock stretching is not supported */
#define I2C_AQ_NO_CLK_STRETCH BIT(4)
+/* message cannot have length of 0 */
+#define I2C_AQ_NO_ZERO_LEN_READ BIT(5)
+#define I2C_AQ_NO_ZERO_LEN_WRITE BIT(6)
+#define I2C_AQ_NO_ZERO_LEN (I2C_AQ_NO_ZERO_LEN_READ | I2C_AQ_NO_ZERO_LEN_WRITE)
/*
* i2c_adapter is the structure used to identify a physical i2c bus along