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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>
This commit is contained in:
Peter Meerwald 2013-11-02 19:44:00 +00:00 committed by Jonathan Cameron
parent ec7f68e07b
commit a5a3e43111
1 changed files with 4 additions and 4 deletions
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8
drivers/iio/adc/mcp3422.c
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@ -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 {