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roccat: compute the CRC on the macro report

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Signed-off-by: Benjamin Tissoires <benjamin.tissoires@gmail.com>
This commit is contained in:
Benjamin Tissoires
2015-09-10 18:21:32 -04:00
parent 96dbf49c60
commit 7f3c974212
1 changed files with 23 additions and 0 deletions
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23
src/driver-roccat.c
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@@ -214,6 +214,18 @@ roccat_button_action_to_raw(const struct ratbag_button_action *action)
return 0;
}
static inline uint16_t roccat_crc(uint8_t *buf, unsigned int len)
{
unsigned i;
uint16_t crc = 0;
for (i = 0; i < len; i++) {
crc += buf[i];
}
return crc;
}
static int
roccat_has_capability(const struct ratbag_device *device,
enum ratbag_device_capability cap)
@@ -555,6 +567,16 @@ roccat_read_button(struct ratbag_button *button)
button->index, button->profile->index,
rc < 0 ? strerror(-rc) : "not read enough", rc);
} else {
uint16_t crc = roccat_crc(buf, ROCCAT_REPORT_SIZE_MACRO - 2);
if (crc != macro->checksum) {
log_error(device->ratbag,
"wrong checksum while reading the macro of button %d of profile %d.\n",
button->index,
button->profile->index);
goto out_macro;
}
ratbag_button_set_macro(button, macro->name);
log_raw(device->ratbag,
"macro on button %d of profile %d is named '%s', and contains %d events:\n",
@@ -577,6 +599,7 @@ roccat_read_button(struct ratbag_button *button)
macro->keys[j].flag & 0x80 ? "released" : "pressed");
}
}
out_macro:
msleep(10);
}
}