1*7224adbbSNeelesh Gupta /* 2*7224adbbSNeelesh Gupta * PowerNV sensor code 3*7224adbbSNeelesh Gupta * 4*7224adbbSNeelesh Gupta * Copyright (C) 2013 IBM 5*7224adbbSNeelesh Gupta * 6*7224adbbSNeelesh Gupta * This program is free software; you can redistribute it and/or modify 7*7224adbbSNeelesh Gupta * it under the terms of the GNU General Public License as published by 8*7224adbbSNeelesh Gupta * the Free Software Foundation; either version 2 of the License, or 9*7224adbbSNeelesh Gupta * (at your option) any later version. 10*7224adbbSNeelesh Gupta * 11*7224adbbSNeelesh Gupta * This program is distributed in the hope that it will be useful, 12*7224adbbSNeelesh Gupta * but WITHOUT ANY WARRANTY; without even the implied warranty of 13*7224adbbSNeelesh Gupta * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14*7224adbbSNeelesh Gupta * GNU General Public License for more details. 15*7224adbbSNeelesh Gupta * 16*7224adbbSNeelesh Gupta * You should have received a copy of the GNU General Public License 17*7224adbbSNeelesh Gupta * along with this program; if not, write to the Free Software 18*7224adbbSNeelesh Gupta * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19*7224adbbSNeelesh Gupta */ 20*7224adbbSNeelesh Gupta 21*7224adbbSNeelesh Gupta #include <linux/delay.h> 22*7224adbbSNeelesh Gupta #include <linux/mutex.h> 23*7224adbbSNeelesh Gupta #include <asm/opal.h> 24*7224adbbSNeelesh Gupta 25*7224adbbSNeelesh Gupta static DEFINE_MUTEX(opal_sensor_mutex); 26*7224adbbSNeelesh Gupta 27*7224adbbSNeelesh Gupta /* 28*7224adbbSNeelesh Gupta * This will return sensor information to driver based on the requested sensor 29*7224adbbSNeelesh Gupta * handle. A handle is an opaque id for the powernv, read by the driver from the 30*7224adbbSNeelesh Gupta * device tree.. 31*7224adbbSNeelesh Gupta */ 32*7224adbbSNeelesh Gupta int opal_get_sensor_data(u32 sensor_hndl, u32 *sensor_data) 33*7224adbbSNeelesh Gupta { 34*7224adbbSNeelesh Gupta int ret, token; 35*7224adbbSNeelesh Gupta struct opal_msg msg; 36*7224adbbSNeelesh Gupta 37*7224adbbSNeelesh Gupta token = opal_async_get_token_interruptible(); 38*7224adbbSNeelesh Gupta if (token < 0) { 39*7224adbbSNeelesh Gupta pr_err("%s: Couldn't get the token, returning\n", __func__); 40*7224adbbSNeelesh Gupta ret = token; 41*7224adbbSNeelesh Gupta goto out; 42*7224adbbSNeelesh Gupta } 43*7224adbbSNeelesh Gupta 44*7224adbbSNeelesh Gupta mutex_lock(&opal_sensor_mutex); 45*7224adbbSNeelesh Gupta ret = opal_sensor_read(sensor_hndl, token, sensor_data); 46*7224adbbSNeelesh Gupta if (ret != OPAL_ASYNC_COMPLETION) 47*7224adbbSNeelesh Gupta goto out_token; 48*7224adbbSNeelesh Gupta 49*7224adbbSNeelesh Gupta ret = opal_async_wait_response(token, &msg); 50*7224adbbSNeelesh Gupta if (ret) { 51*7224adbbSNeelesh Gupta pr_err("%s: Failed to wait for the async response, %d\n", 52*7224adbbSNeelesh Gupta __func__, ret); 53*7224adbbSNeelesh Gupta goto out_token; 54*7224adbbSNeelesh Gupta } 55*7224adbbSNeelesh Gupta 56*7224adbbSNeelesh Gupta ret = msg.params[1]; 57*7224adbbSNeelesh Gupta 58*7224adbbSNeelesh Gupta out_token: 59*7224adbbSNeelesh Gupta mutex_unlock(&opal_sensor_mutex); 60*7224adbbSNeelesh Gupta opal_async_release_token(token); 61*7224adbbSNeelesh Gupta out: 62*7224adbbSNeelesh Gupta return ret; 63*7224adbbSNeelesh Gupta } 64*7224adbbSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_get_sensor_data); 65