Commit 7224adbb authored by Neelesh Gupta's avatar Neelesh Gupta Committed by Benjamin Herrenschmidt

powerpc/powernv: Enable fetching of platform sensor data

This patch enables fetching of various platform sensor data through
OPAL and expects a sensor handle from the driver to pass to OPAL.
Signed-off-by: default avatarNeelesh Gupta <neelegup@linux.vnet.ibm.com>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent 4029cd66
......@@ -168,6 +168,7 @@ extern int opal_enter_rtas(struct rtas_args *args,
#define OPAL_GET_MSG 85
#define OPAL_CHECK_ASYNC_COMPLETION 86
#define OPAL_SYNC_HOST_REBOOT 87
#define OPAL_SENSOR_READ 88
#define OPAL_GET_PARAM 89
#define OPAL_SET_PARAM 90
#define OPAL_DUMP_RESEND 91
......@@ -872,6 +873,8 @@ int64_t opal_get_param(uint64_t token, uint32_t param_id, uint64_t buffer,
size_t length);
int64_t opal_set_param(uint64_t token, uint32_t param_id, uint64_t buffer,
size_t length);
int64_t opal_sensor_read(uint32_t sensor_hndl, int token,
uint32_t *sensor_data);
/* Internal functions */
extern int early_init_dt_scan_opal(unsigned long node, const char *uname, int depth, void *data);
......@@ -902,6 +905,7 @@ extern int opal_async_get_token_interruptible(void);
extern int __opal_async_release_token(int token);
extern int opal_async_release_token(int token);
extern int opal_async_wait_response(uint64_t token, struct opal_msg *msg);
extern int opal_get_sensor_data(u32 sensor_hndl, u32 *sensor_data);
extern void hvc_opal_init_early(void);
......
obj-y += setup.o opal-takeover.o opal-wrappers.o opal.o opal-async.o
obj-y += opal-rtc.o opal-nvram.o opal-lpc.o opal-flash.o
obj-y += rng.o opal-elog.o opal-dump.o opal-sysparam.o
obj-y += rng.o opal-elog.o opal-dump.o opal-sysparam.o opal-sensor.o
obj-$(CONFIG_SMP) += smp.o
obj-$(CONFIG_PCI) += pci.o pci-p5ioc2.o pci-ioda.o
......
/*
* PowerNV sensor code
*
* Copyright (C) 2013 IBM
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/delay.h>
#include <linux/mutex.h>
#include <asm/opal.h>
static DEFINE_MUTEX(opal_sensor_mutex);
/*
* This will return sensor information to driver based on the requested sensor
* handle. A handle is an opaque id for the powernv, read by the driver from the
* device tree..
*/
int opal_get_sensor_data(u32 sensor_hndl, u32 *sensor_data)
{
int ret, token;
struct opal_msg msg;
token = opal_async_get_token_interruptible();
if (token < 0) {
pr_err("%s: Couldn't get the token, returning\n", __func__);
ret = token;
goto out;
}
mutex_lock(&opal_sensor_mutex);
ret = opal_sensor_read(sensor_hndl, token, sensor_data);
if (ret != OPAL_ASYNC_COMPLETION)
goto out_token;
ret = opal_async_wait_response(token, &msg);
if (ret) {
pr_err("%s: Failed to wait for the async response, %d\n",
__func__, ret);
goto out_token;
}
ret = msg.params[1];
out_token:
mutex_unlock(&opal_sensor_mutex);
opal_async_release_token(token);
out:
return ret;
}
EXPORT_SYMBOL_GPL(opal_get_sensor_data);
......@@ -140,5 +140,6 @@ OPAL_CALL(opal_get_msg, OPAL_GET_MSG);
OPAL_CALL(opal_check_completion, OPAL_CHECK_ASYNC_COMPLETION);
OPAL_CALL(opal_dump_resend_notification, OPAL_DUMP_RESEND);
OPAL_CALL(opal_sync_host_reboot, OPAL_SYNC_HOST_REBOOT);
OPAL_CALL(opal_sensor_read, OPAL_SENSOR_READ);
OPAL_CALL(opal_get_param, OPAL_GET_PARAM);
OPAL_CALL(opal_set_param, OPAL_SET_PARAM);
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment