17224adbbSNeelesh Gupta /* 27224adbbSNeelesh Gupta * PowerNV sensor code 37224adbbSNeelesh Gupta * 47224adbbSNeelesh Gupta * Copyright (C) 2013 IBM 57224adbbSNeelesh Gupta * 67224adbbSNeelesh Gupta * This program is free software; you can redistribute it and/or modify 77224adbbSNeelesh Gupta * it under the terms of the GNU General Public License as published by 87224adbbSNeelesh Gupta * the Free Software Foundation; either version 2 of the License, or 97224adbbSNeelesh Gupta * (at your option) any later version. 107224adbbSNeelesh Gupta * 117224adbbSNeelesh Gupta * This program is distributed in the hope that it will be useful, 127224adbbSNeelesh Gupta * but WITHOUT ANY WARRANTY; without even the implied warranty of 137224adbbSNeelesh Gupta * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 147224adbbSNeelesh Gupta * GNU General Public License for more details. 157224adbbSNeelesh Gupta * 167224adbbSNeelesh Gupta * You should have received a copy of the GNU General Public License 177224adbbSNeelesh Gupta * along with this program; if not, write to the Free Software 187224adbbSNeelesh Gupta * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 197224adbbSNeelesh Gupta */ 207224adbbSNeelesh Gupta 217224adbbSNeelesh Gupta #include <linux/delay.h> 227224adbbSNeelesh Gupta #include <linux/mutex.h> 237224adbbSNeelesh Gupta #include <asm/opal.h> 247224adbbSNeelesh Gupta 257224adbbSNeelesh Gupta static DEFINE_MUTEX(opal_sensor_mutex); 267224adbbSNeelesh Gupta 277224adbbSNeelesh Gupta /* 287224adbbSNeelesh Gupta * This will return sensor information to driver based on the requested sensor 297224adbbSNeelesh Gupta * handle. A handle is an opaque id for the powernv, read by the driver from the 307224adbbSNeelesh Gupta * device tree.. 317224adbbSNeelesh Gupta */ 327224adbbSNeelesh Gupta int opal_get_sensor_data(u32 sensor_hndl, u32 *sensor_data) 337224adbbSNeelesh Gupta { 347224adbbSNeelesh Gupta int ret, token; 357224adbbSNeelesh Gupta struct opal_msg msg; 367224adbbSNeelesh Gupta 377224adbbSNeelesh Gupta token = opal_async_get_token_interruptible(); 387224adbbSNeelesh Gupta if (token < 0) { 397224adbbSNeelesh Gupta pr_err("%s: Couldn't get the token, returning\n", __func__); 407224adbbSNeelesh Gupta ret = token; 417224adbbSNeelesh Gupta goto out; 427224adbbSNeelesh Gupta } 437224adbbSNeelesh Gupta 447224adbbSNeelesh Gupta mutex_lock(&opal_sensor_mutex); 457224adbbSNeelesh Gupta ret = opal_sensor_read(sensor_hndl, token, sensor_data); 467224adbbSNeelesh Gupta if (ret != OPAL_ASYNC_COMPLETION) 477224adbbSNeelesh Gupta goto out_token; 487224adbbSNeelesh Gupta 497224adbbSNeelesh Gupta ret = opal_async_wait_response(token, &msg); 507224adbbSNeelesh Gupta if (ret) { 517224adbbSNeelesh Gupta pr_err("%s: Failed to wait for the async response, %d\n", 527224adbbSNeelesh Gupta __func__, ret); 537224adbbSNeelesh Gupta goto out_token; 547224adbbSNeelesh Gupta } 557224adbbSNeelesh Gupta 567224adbbSNeelesh Gupta ret = msg.params[1]; 577224adbbSNeelesh Gupta 587224adbbSNeelesh Gupta out_token: 597224adbbSNeelesh Gupta mutex_unlock(&opal_sensor_mutex); 607224adbbSNeelesh Gupta opal_async_release_token(token); 617224adbbSNeelesh Gupta out: 627224adbbSNeelesh Gupta return ret; 637224adbbSNeelesh Gupta } 647224adbbSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_get_sensor_data); 65