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authorPeter Meerwald <pmeerw@pmeerw.net>2013-11-02 19:44:00 +0000
committerJonathan Cameron <jic23@kernel.org>2013-11-05 22:45:25 +0000
commita5a3e43111e145aaaec4c60c927a8155b875890a (patch)
tree66379d7354a1a357360970df6f00cca39c1e12a6 /drivers/iio
parentec7f68e07bf10198717b7824c78201b46bbf1956 (diff)
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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 <pmeerw@pmeerw.net> Acked-by: Angelo Compagnucci <angelo.compagnucci@gmail.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Diffstat (limited to 'drivers/iio')
-rw-r--r--drivers/iio/adc/mcp3422.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/iio/adc/mcp3422.c b/drivers/iio/adc/mcp3422.c
index 1294832..c8c1baa 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 {
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