[PATCH v2 01/10] i2c: Introduce i2c_10bit_addr_*_from_msg() helpers

Andy Shevchenko
2025-02-13T14:10:59Z

There are already a lot of drivers that have been using
i2c_8bit_addr_from_msg() for 7-bit addresses, now it's time
to have the similar for 10-bit addresses.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
include/linux/i2c.h | 14 ++++++++++++++
1 file changed, 14 insertions(+)

diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index 997e80649889..e23b373b6b57 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -952,6 +952,20 @@ static inline u8 i2c_8bit_addr_from_msg(const struct i2c_msg *msg)
return (msg->addr << 1) | (msg->flags & I2C_M_RD);
}

+/*
+ * 10-bit address
+ * addr_1: 5'b11110 | addr[9:8] | (R/nW)
+ * addr_2: addr[7:0]
+ */
+static inline u8 i2c_10bit_addr_hi_from_msg(const struct i2c_msg *msg)
+{
+ return 0xf0 | ((msg->addr & GENMASK(9, 8)) >> 7) | (msg->flags & I2C_M_RD);
+}
+static inline u8 i2c_10bit_addr_lo_from_msg(const struct i2c_msg *msg)
+{
+ return msg->addr & GENMASK(7, 0);
+}
+
u8 *i2c_get_dma_safe_msg_buf(struct i2c_msg *msg, unsigned int threshold);
void i2c_put_dma_safe_msg_buf(u8 *buf, struct i2c_msg *msg, bool xferred);

--
2.45.1.3035.g276e886db78b