static int
hidpp20_request_command_allow_error(struct ratbag_device *device, union hidpp20_message *msg,
bool allow_error)
{
struct ratbag *ratbag = device->ratbag;
union hidpp20_message read_buffer;
int ret;
uint8_t hidpp_err = 0;
size_t msg_len;
/* msg->address is 4 MSB: subcommand, 4 LSB: 4-bit SW identifier so
* the device knows who to respond to. kernel uses 0x1 */
const int DEVICE_SW_ID = 0x8;
if (msg->msg.address & 0xf) {
log_bug_libratbag(ratbag, "hidpp20 error: sw address is already set\n");
return -EINVAL;
}
msg->msg.address |= DEVICE_SW_ID;
msg_len = msg->msg.report_id == REPORT_ID_SHORT ? SHORT_MESSAGE_LENGTH : LONG_MESSAGE_LENGTH;
log_buf_raw(ratbag, "sending: ", msg->data, msg_len);
/* Send the message to the Device */
ret = hidpp20_write_command(device, msg->data, msg_len);
if (ret)
goto out_err;
/*
* Now read the answers from the device:
* loop until we get the actual answer or an error code.
*/
do {
ret = ratbag_hidraw_read_input_report(device, read_buffer.data, LONG_MESSAGE_LENGTH);
/* Wait and retry if the USB timed out */
if (ret == -ETIMEDOUT) {
msleep(10);
ret = ratbag_hidraw_read_input_report(device, read_buffer.data, LONG_MESSAGE_LENGTH);
}
log_buf_raw(ratbag, " *** received: ", read_buffer.data, ret > 0 ? ret : 0);
if (read_buffer.msg.report_id != REPORT_ID_SHORT &&
read_buffer.msg.report_id != REPORT_ID_LONG)
continue;
/* actual answer */
if (read_buffer.msg.sub_id == msg->msg.sub_id &&
read_buffer.msg.address == msg->msg.address)
break;
/* error */
if ((read_buffer.msg.sub_id == __ERROR_MSG ||
read_buffer.msg.sub_id == 0xff) &&
read_buffer.msg.address == msg->msg.sub_id &&
read_buffer.msg.parameters[0] == msg->msg.address) {
hidpp_err = read_buffer.msg.parameters[1];
if (allow_error)
log_debug(ratbag,
" HID++ error from the device (%d): %s (%02x)\n",
read_buffer.msg.device_idx,
hidpp_errors[hidpp_err] ? hidpp_errors[hidpp_err] : "Undocumented error code",
hidpp_err);
else
log_error(ratbag,
" HID++ error from the device (%d): %s (%02x)\n",
read_buffer.msg.device_idx,
hidpp_errors[hidpp_err] ? hidpp_errors[hidpp_err] : "Undocumented error code",
hidpp_err);
break;
}
} while (ret > 0);
if (ret < 0) {
log_error(ratbag, " USB error: %s (%d)\n", strerror(-ret), -ret);
perror("write");
goto out_err;
}
if (!hidpp_err) {
/* copy the answer for the caller */
*msg = read_buffer;
}
ret = hidpp_err;
out_err:
return ret;
}
int
hidpp10_request_command(struct hidpp10_device *dev, union hidpp10_message *msg)
{
struct ratbag_device *device = dev->ratbag_device;
struct ratbag *ratbag = device->ratbag;
union hidpp10_message read_buffer;
union hidpp10_message expected_header;
union hidpp10_message expected_error_dev = ERROR_MSG(msg, msg->msg.device_idx);
int ret;
uint8_t hidpp_err = 0;
/* create the expected header */
expected_header = *msg;
switch (msg->msg.sub_id) {
case SET_REGISTER_REQ:
expected_header.msg.report_id = REPORT_ID_SHORT;
break;
case GET_REGISTER_REQ:
expected_header.msg.report_id = REPORT_ID_SHORT;
break;
case SET_LONG_REGISTER_REQ:
expected_header.msg.report_id = REPORT_ID_LONG;
break;
case GET_LONG_REGISTER_REQ:
expected_header.msg.report_id = REPORT_ID_LONG;
break;
}
log_buf_raw(ratbag, "sending: ", msg->data, SHORT_MESSAGE_LENGTH);
log_buf_raw(ratbag, " expected_header: ", expected_header.data, SHORT_MESSAGE_LENGTH);
log_buf_raw(ratbag, " expected_error_dev: ", expected_error_dev.data, SHORT_MESSAGE_LENGTH);
/* Send the message to the Device */
ret = hidpp10_write_command(dev, msg->data, SHORT_MESSAGE_LENGTH);
if (ret)
goto out_err;
/*
* Now read the answers from the device:
* loop until we get the actual answer or an error code.
*/
do {
ret = ratbag_hidraw_read_input_report(device, read_buffer.data, LONG_MESSAGE_LENGTH);
/* Overwrite the return device index with ours. The kernel
* sets our device index on write, but gives us the real
* device index on reply. Overwrite it with our index so the
* messages are easier to check and compare.
*/
read_buffer.msg.device_idx = msg->msg.device_idx;
log_buf_raw(ratbag, " *** received: ", read_buffer.data, ret);
/* actual answer */
if (!memcmp(read_buffer.data, expected_header.data, 4))
break;
/* error */
if (!memcmp(read_buffer.data, expected_error_dev.data, 5)) {
hidpp_err = read_buffer.msg.parameters[1];
log_raw(ratbag,
" HID++ error from the %s (%d): %s (%02x)\n",
read_buffer.msg.device_idx == RECEIVER_IDX ? "receiver" : "device",
read_buffer.msg.device_idx,
hidpp_errors[hidpp_err] ? hidpp_errors[hidpp_err] : "Undocumented error code",
hidpp_err);
break;
}
} while (ret > 0);
if (ret < 0) {
log_error(ratbag, " USB error: %s (%d)\n", strerror(-ret), -ret);
perror("write");
goto out_err;
}
if (!hidpp_err) {
log_buf_raw(ratbag, " received: ", read_buffer.data, ret);
/* copy the answer for the caller */
*msg = read_buffer;
}
ret = hidpp_err;
out_err:
return ret;
}
