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| author | Alexander Usyskin <alexander.usyskin@intel.com> | 2019-11-07 12:44:45 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-11-07 09:37:27 +0100 |
| commit | 52f6efdf80924449023c559c3134258c2c6da43b (patch) | |
| tree | ccd825fd49ac508daeb552315eaddf741b43f74d /drivers/misc/mei/main.c | |
| parent | 261e071acd9bcbcfbc30652640385615ced27f4f (diff) | |
| download | linux-52f6efdf80924449023c559c3134258c2c6da43b.tar.gz | |
mei: add trc detection register to sysfs
The glitch detection HW (TRC) save it status information into
TRC status register.
Make it available to user-space via read-only sysfs file.
The TRC register is availab for PCH15 gen and newer, for older
platforms reading the sysfs file will fail with EOPNOTSUPP.
Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Link: https://lore.kernel.org/r/20191107104445.19101-1-tomas.winkler@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc/mei/main.c')
| -rw-r--r-- | drivers/misc/mei/main.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/misc/mei/main.c b/drivers/misc/mei/main.c index 7310b476323c..4ef6e37caafc 100644 --- a/drivers/misc/mei/main.c +++ b/drivers/misc/mei/main.c @@ -701,6 +701,29 @@ static int mei_fasync(int fd, struct file *file, int band) } /** + * trc_show - mei device trc attribute show method + * + * @device: device pointer + * @attr: attribute pointer + * @buf: char out buffer + * + * Return: number of the bytes printed into buf or error + */ +static ssize_t trc_show(struct device *device, + struct device_attribute *attr, char *buf) +{ + struct mei_device *dev = dev_get_drvdata(device); + u32 trc; + int ret; + + ret = mei_trc_status(dev, &trc); + if (ret) + return ret; + return sprintf(buf, "%08X\n", trc); +} +static DEVICE_ATTR_RO(trc); + +/** * fw_status_show - mei device fw_status attribute show method * * @device: device pointer @@ -887,6 +910,7 @@ static struct attribute *mei_attrs[] = { &dev_attr_tx_queue_limit.attr, &dev_attr_fw_ver.attr, &dev_attr_dev_state.attr, + &dev_attr_trc.attr, NULL }; ATTRIBUTE_GROUPS(mei); |