From: Peter Meerwald Date: Sat, 2 Nov 2013 19:44:00 +0000 (+0000) Subject: iio: Fix sign extension table in mcp3422 driver X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=a5a3e43111e145aaaec4c60c927a8155b875890a;p=linux-beck.git iio: Fix sign extension table in mcp3422 driver the index argument to sign_extend32() gives the bit position (from 0) to the sign bit so e.g. if the measurement has 16-bit resolution, we need to pass 15; a measurement of 0x8000 should be reported as -32768, not 32768 Signed-off-by: Peter Meerwald Acked-by: Angelo Compagnucci Signed-off-by: Jonathan Cameron --- diff --git a/drivers/iio/adc/mcp3422.c b/drivers/iio/adc/mcp3422.c index 12948325431c..c8c1baaec6c1 100644 --- a/drivers/iio/adc/mcp3422.c +++ b/drivers/iio/adc/mcp3422.c @@ -88,10 +88,10 @@ static const int mcp3422_sample_rates[4] = { /* sample rates to sign extension table */ static const int mcp3422_sign_extend[4] = { - [MCP3422_SRATE_240] = 12, - [MCP3422_SRATE_60] = 14, - [MCP3422_SRATE_15] = 16, - [MCP3422_SRATE_3] = 18 }; + [MCP3422_SRATE_240] = 11, + [MCP3422_SRATE_60] = 13, + [MCP3422_SRATE_15] = 15, + [MCP3422_SRATE_3] = 17 }; /* Client data (each client gets its own) */ struct mcp3422 {