int hidpp10_request_command(int fd, union hidpp10_message *msg) {
union hidpp10_message read_buffer;
union hidpp10_message expected_header;
union hidpp10_message expected_error_recv = ERROR_MSG(msg, RECEIVER_IDX);
union hidpp10_message expected_error_dev = ERROR_MSG(msg, msg->msg.device_idx);
int ret;
__u8 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;
}
pr_dbg("sending: "); pr_buffer(msg->data, SHORT_MESSAGE_LENGTH);
#if DEBUG_LVL > 1
pr_dbg(" expected_header: "); pr_buffer(expected_header.data, SHORT_MESSAGE_LENGTH);
pr_dbg(" expected_error_recv: "); pr_buffer(expected_error_recv.data, SHORT_MESSAGE_LENGTH);
pr_dbg(" expected_error_dev: "); pr_buffer(expected_error_dev.data, SHORT_MESSAGE_LENGTH);
#endif
/* Send the message to the Device */
ret = hidpp10_write_command(fd, 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 = read(fd, read_buffer.data, LONG_MESSAGE_LENGTH);
#if DEBUG_LVL > 2
printf(" *** received: "); pr_buffer(read_buffer.data, ret);
#endif
/* actual answer */
if (!memcmp(read_buffer.data, expected_header.data, 4))
break;
/* error */
if (!memcmp(read_buffer.data, expected_error_recv.data, 5) ||
!memcmp(read_buffer.data, expected_error_dev.data, 5)) {
hidpp_err = read_buffer.msg.parameters[1];
pr_dbg(" 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) {
printf(" USB error: %d\n", errno);
perror("write");
goto out_err;
}
if (!hidpp_err) {
pr_dbg(" received: "); pr_buffer(read_buffer.data, ret);
/* 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;
}
