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> 238de303baSNeelesh Gupta #include <linux/of_platform.h> 247224adbbSNeelesh Gupta #include <asm/opal.h> 258de303baSNeelesh Gupta #include <asm/machdep.h> 267224adbbSNeelesh Gupta 277224adbbSNeelesh Gupta static DEFINE_MUTEX(opal_sensor_mutex); 287224adbbSNeelesh Gupta 297224adbbSNeelesh Gupta /* 307224adbbSNeelesh Gupta * This will return sensor information to driver based on the requested sensor 317224adbbSNeelesh Gupta * handle. A handle is an opaque id for the powernv, read by the driver from the 327224adbbSNeelesh Gupta * device tree.. 337224adbbSNeelesh Gupta */ 347224adbbSNeelesh Gupta int opal_get_sensor_data(u32 sensor_hndl, u32 *sensor_data) 357224adbbSNeelesh Gupta { 367224adbbSNeelesh Gupta int ret, token; 377224adbbSNeelesh Gupta struct opal_msg msg; 389000c17dSAnton Blanchard __be32 data; 397224adbbSNeelesh Gupta 407224adbbSNeelesh Gupta token = opal_async_get_token_interruptible(); 417224adbbSNeelesh Gupta if (token < 0) { 427224adbbSNeelesh Gupta pr_err("%s: Couldn't get the token, returning\n", __func__); 437224adbbSNeelesh Gupta ret = token; 447224adbbSNeelesh Gupta goto out; 457224adbbSNeelesh Gupta } 467224adbbSNeelesh Gupta 477224adbbSNeelesh Gupta mutex_lock(&opal_sensor_mutex); 489000c17dSAnton Blanchard ret = opal_sensor_read(sensor_hndl, token, &data); 496bc08d03SCédric Le Goater switch (ret) { 506bc08d03SCédric Le Goater case OPAL_ASYNC_COMPLETION: 517224adbbSNeelesh Gupta ret = opal_async_wait_response(token, &msg); 527224adbbSNeelesh Gupta if (ret) { 537224adbbSNeelesh Gupta pr_err("%s: Failed to wait for the async response, %d\n", 547224adbbSNeelesh Gupta __func__, ret); 557224adbbSNeelesh Gupta goto out_token; 567224adbbSNeelesh Gupta } 577224adbbSNeelesh Gupta 58d0226d31SSuraj Jitindar Singh ret = opal_error_code(opal_get_async_rc(msg)); 596bc08d03SCédric Le Goater *sensor_data = be32_to_cpu(data); 606bc08d03SCédric Le Goater break; 616bc08d03SCédric Le Goater 626bc08d03SCédric Le Goater case OPAL_SUCCESS: 636bc08d03SCédric Le Goater ret = 0; 646bc08d03SCédric Le Goater *sensor_data = be32_to_cpu(data); 656bc08d03SCédric Le Goater break; 666bc08d03SCédric Le Goater 6717bb6951SVipin K Parashar case OPAL_WRONG_STATE: 6817bb6951SVipin K Parashar ret = -EIO; 6917bb6951SVipin K Parashar break; 7017bb6951SVipin K Parashar 716bc08d03SCédric Le Goater default: 726bc08d03SCédric Le Goater ret = opal_error_code(ret); 736bc08d03SCédric Le Goater break; 746bc08d03SCédric Le Goater } 757224adbbSNeelesh Gupta 767224adbbSNeelesh Gupta out_token: 777224adbbSNeelesh Gupta mutex_unlock(&opal_sensor_mutex); 787224adbbSNeelesh Gupta opal_async_release_token(token); 797224adbbSNeelesh Gupta out: 807224adbbSNeelesh Gupta return ret; 817224adbbSNeelesh Gupta } 827224adbbSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_get_sensor_data); 838de303baSNeelesh Gupta 8496e023e7SAlistair Popple int __init opal_sensor_init(void) 858de303baSNeelesh Gupta { 868de303baSNeelesh Gupta struct platform_device *pdev; 878de303baSNeelesh Gupta struct device_node *sensor; 888de303baSNeelesh Gupta 898de303baSNeelesh Gupta sensor = of_find_node_by_path("/ibm,opal/sensors"); 908de303baSNeelesh Gupta if (!sensor) { 918de303baSNeelesh Gupta pr_err("Opal node 'sensors' not found\n"); 928de303baSNeelesh Gupta return -ENODEV; 938de303baSNeelesh Gupta } 948de303baSNeelesh Gupta 958de303baSNeelesh Gupta pdev = of_platform_device_create(sensor, "opal-sensor", NULL); 968de303baSNeelesh Gupta of_node_put(sensor); 978de303baSNeelesh Gupta 988de303baSNeelesh Gupta return PTR_ERR_OR_ZERO(pdev); 998de303baSNeelesh Gupta } 100