/*
* Device IO: read, write and toggle bit
*/
static int trackpoint_read(struct ps2dev *ps2dev, u8 loc, u8 *results)
{
if (ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, TP_COMMAND)) ||
ps2_command(ps2dev, results, MAKE_PS2_CMD(0, 1, loc))) {
return -1;
}
return 0;
}
static int trackpoint_write(struct ps2dev *ps2dev, u8 loc, u8 val)
{
if (ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, TP_COMMAND)) ||
ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, TP_WRITE_MEM)) ||
ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, loc)) ||
ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, val))) {
return -1;
}
return 0;
}
static int trackpoint_toggle_bit(struct ps2dev *ps2dev, u8 loc, u8 mask)
{
/* Bad things will happen if the loc param isn't in this range */
if (loc < 0x20 || loc >= 0x2F)
return -1;
if (ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, TP_COMMAND)) ||
ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, TP_TOGGLE)) ||
ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, loc)) ||
ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, mask))) {
return -1;
}
return 0;
}
static int trackpoint_toggle_bit(struct ps2dev *ps2dev, unsigned char loc, unsigned char mask)
{
if (loc < 0x20 || loc >= 0x2F)
return -1;
if (ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, TP_COMMAND)) ||
ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, TP_TOGGLE)) ||
ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, loc)) ||
ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, mask))) {
return -1;
}
return 0;
}
/*
* Power-on Reset: Resets all trackpoint parameters, including RAM values,
* to defaults.
* Returns zero on success, non-zero on failure.
*/
static int trackpoint_power_on_reset(struct ps2dev *ps2dev)
{
u8 results[2];
int tries = 0;
/* Issue POR command, and repeat up to once if 0xFC00 received */
do {
if (ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, TP_COMMAND)) ||
ps2_command(ps2dev, results, MAKE_PS2_CMD(0, 2, TP_POR)))
return -1;
} while (results[0] == 0xFC && results[1] == 0x00 && ++tries < 2);
/* Check for success response -- 0xAA00 */
if (results[0] != 0xAA || results[1] != 0x00)
return -ENODEV;
return 0;
}
