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hidpp20: move the crc function up

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Signed-off-by: Benjamin Tissoires <benjamin.tissoires@gmail.com>
This commit is contained in:
Benjamin Tissoires
2015-11-06 17:53:30 +01:00
parent 071a507d44
commit ee2bd0475f
1 changed files with 27 additions and 27 deletions
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54
src/hidpp20.c
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@@ -919,6 +919,33 @@ int hidpp20_adjustable_dpi_set_sensor_dpi(struct hidpp20_device *device,
#define HIDPP20_PROFILE_SIZE (16*16)
#define HIDPP20_BUTTON_HID 0x80
/*
* The following crc computation has been provided by Logitech
*/
#define CRC_CCITT_SEED 0xFFFF
static uint16_t
hidpp20_crc_ccitt(uint8_t *data, unsigned int length)
{
uint16_t crc, temp, quick;
unsigned int i;
crc = CRC_CCITT_SEED;
for (i = 0; i < length; i++) {
temp = (crc >> 8) ^ (*data++);
crc <<= 8;
quick = temp ^ (temp >> 4);
crc ^= quick;
quick <<= 5;
crc ^= quick;
quick <<= 7;
crc ^= quick;
}
return crc;
}
int
hidpp20_onboard_profiles_read_memory(struct hidpp20_device *device,
uint8_t read_rom,
@@ -1211,33 +1238,6 @@ int hidpp20_onboard_profiles_read(struct hidpp20_device *device,
return 0;
}
/*
* The following crc computation has been provided by Logitech
*/
#define CRC_CCITT_SEED 0xFFFF
static uint16_t
hidpp20_crc_ccitt(uint8_t *data, unsigned int length)
{
uint16_t crc, temp, quick;
unsigned int i;
crc = CRC_CCITT_SEED;
for (i = 0; i < length; i++) {
temp = (crc >> 8) ^ (*data++);
crc <<=8;
quick = temp ^ (temp >> 4);
crc ^= quick;
quick <<= 5;
crc ^= quick;
quick <<= 7;
crc ^= quick;
}
return crc;
}
int hidpp20_onboard_profiles_write(struct hidpp20_device *device,
unsigned int index,
struct hidpp20_profiles *profiles_list)