This matches the method implemented in i2cdetect(8) when using its -q
option.
With this change an rx8130 RTC is detectable using i2c_probe. This
failed before because this chip acks the first byte (containing its
address and the R/̅W bit) but nacks the following 0 (representing the
target address to write nothing to) which makes i2c_write_reg() return
with an error and so the chip is not listed as available.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>
---
commands/i2c.c | 16 ++++++++--------
1 file changed, 8 insertions(+), 8 deletions(-)
diff --git a/commands/i2c.c b/commands/i2c.c
index 65ff7378ec14..77d65e3fa32b 100644
--- a/commands/i2c.c
+++ b/commands/i2c.c
@@ -24,19 +24,19 @@
static void i2c_probe_range(struct i2c_adapter *adapter, int startaddr, int stopaddr)
{
- struct i2c_client client = {};
int addr;
- int ret;
- u8 reg;
-
- client.adapter = adapter;
printf("probing i2c%d range 0x%02x-0x%02x: ", adapter->nr, startaddr, stopaddr);
for (addr = startaddr; addr <= stopaddr && !ctrlc(); addr++) {
- client.addr = addr;
- ret = i2c_write_reg(&client, 0x00, ®, 0);
- if (ret == 0)
+ struct i2c_msg msg = {
+ .addr = addr,
+ .buf = NULL,
+ .len = 0,
+ };
+ int ret = i2c_transfer(adapter, &msg, 1);
+ if (ret == 1)
printf("0x%02x ", addr);
+
}
printf("\n");
}
--
2.20.1
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