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hidpp20: fix adjustable DPI for older mice

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The G502 uses the version 0 of the adjustable DPI feature. This version
does not echo the given parameters which raised a -EIO in libratbag.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@gmail.com>
This commit is contained in:
Benjamin Tissoires
2015-10-11 10:24:03 -04:00
parent 439e287776
commit f4777e7b71
1 changed files with 5 additions and 1 deletions
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6
src/hidpp20.c
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@@ -883,6 +883,7 @@ int hidpp20_adjustable_dpi_set_sensor_dpi(struct ratbag_device *device,
struct hidpp20_sensor *sensor, uint16_t dpi)
{
uint8_t feature_index, feature_type, feature_version;
uint16_t returned_parameters;
int rc;
union hidpp20_message msg = {
.msg.report_id = REPORT_ID_LONG,
@@ -907,7 +908,10 @@ int hidpp20_adjustable_dpi_set_sensor_dpi(struct ratbag_device *device,
if (rc)
return rc;
if (hidpp20_get_unaligned_u16(&msg.msg.parameters[1]) != dpi)
returned_parameters = hidpp20_get_unaligned_u16(&msg.msg.parameters[1]);
/* version 0 of the protocol does not echo the parameters */
if (returned_parameters != dpi && returned_parameters)
return -EIO;
return 0;