https://github.com/torvalds/linux
Revision 347d7e45bd09ce09cbc30d5cea9de377eb22f55c authored by Stevens, Nick on 01 July 2015, 16:07:41 UTC, committed by Guenter Roeck on 01 July 2015, 20:56:27 UTC
The mcp3021 scaling code is dividing the VDD (full-scale) value in millivolts by the A2D resolution to obtain the scaling factor. When VDD is 3300mV (the standard value) and the resolution is 12-bit (4096 divisions), the result is a scale factor of 3300/4096, which is always one. Effectively, the raw A2D reading is always being returned because no scaling is applied. This patch fixes the issue and simplifies the register-to-volts calculation, removing the unneeded "output_scale" struct member. Signed-off-by: Nick Stevens <Nick.Stevens@digi.com> Cc: stable@vger.kernel.org # v3.10+ [Guenter Roeck: Dropped unnecessary value check] Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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History 
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Tip revision: 347d7e45bd09ce09cbc30d5cea9de377eb22f55c authored by Stevens, Nick on 01 July 2015, 16:07:41 UTC
hwmon: (mcp3021) Fix broken output scaling
hwmon: (mcp3021) Fix broken output scaling
Tip revision: 347d7e4
| File | Mode | Size |
|---|---|---|
| bpf | ||
| hidraw | ||
| hw_breakpoint | ||
| kdb | ||
| kfifo | ||
| kobject | ||
| kprobes | ||
| livepatch | ||
| pktgen | ||
| rpmsg | ||
| seccomp | ||
| trace_events | ||
| uhid | ||
| Kconfig | -rw-r--r-- | 2.0 KB |
| Makefile | -rw-r--r-- | 162 bytes |
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