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Commit a5a3e431 authored by Peter Meerwald's avatar Peter Meerwald Committed by Jonathan Cameron
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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: default avatarPeter Meerwald <pmeerw@pmeerw.net>
Acked-by: default avatarAngelo Compagnucci <angelo.compagnucci@gmail.com>
Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
parent ec7f68e0

drivers/iio/adc/mcp3422.c

+4 −4
Original line number Diff line number Diff line
@@ -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 {