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| author | Prathima <Prathima.Lk@amd.com> | 2026-07-10 16:46:40 +0530 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2026-07-17 15:50:48 +0200 |
| commit | 48ad55cda029dca47f4cd76b88f18fdfb1d309a8 (patch) | |
| tree | 8d77ac109fed60215c19dfb4c2c729700700ca92 /include/linux/misc | |
| parent | f61a6fd4593bddc0f2109a1d3359fd2a88124d33 (diff) | |
| download | linux-next-48ad55cda029dca47f4cd76b88f18fdfb1d309a8.tar.gz linux-next-48ad55cda029dca47f4cd76b88f18fdfb1d309a8.zip | |
misc: amd-sbi: Add SBTSI ioctl register transfer interface
Implement IOCTL interface for SB-TSI driver to enable userspace access
to TSI register read/write operations through the AMD Advanced Platform
Management Link (APML) protocol.
Add an ioctl command (SBTSI_IOCTL_REG_XFER_CMD) that accepts a register
address, data byte, and direction flag.
The mutex is taken on the ioctl path here; the hwmon path is placed
under the same lock in the next patch, which completes serialization between
the hwmon and ioctl paths.
Reviewed-by: Akshay Gupta <Akshay.Gupta@amd.com>
Signed-off-by: Prathima <Prathima.Lk@amd.com>
Link: https://patch.msgid.link/20260710111642.850022-7-Akshay.Gupta@amd.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/misc')
| -rw-r--r-- | include/linux/misc/tsi.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/include/linux/misc/tsi.h b/include/linux/misc/tsi.h index 0bdd9d923f92..5273c44688f0 100644 --- a/include/linux/misc/tsi.h +++ b/include/linux/misc/tsi.h @@ -8,30 +8,46 @@ #ifndef _LINUX_MISC_TSI_H_ #define _LINUX_MISC_TSI_H_ +#include <linux/cleanup.h> #include <linux/i2c.h> #include <linux/i3c/device.h> +#include <linux/kref.h> +#include <linux/miscdevice.h> +#include <linux/mutex.h> #include <linux/types.h> /** * struct sbtsi_data - driver private data for an AMD SB-TSI device * @client: underlying I2C client * @i3cdev: underlying I3C device (when using I3C bus) + * @sbtsi_misc_dev: miscdevice exposing ioctl interface at /dev/sbtsi-<addr> + * @lock: mutex protecting concurrent access to the device + * @kref: reference count; keeps @sbtsi_data alive while misc fds are open * @dev_addr: I2C/I3C device address, used as the auxiliary device instance id + * and name the misc device node * @ext_range_mode: sensor uses extended temperature range * @read_order: if set, decimal part must be read before integer part * @is_i3c: true when the device is accessed over I3C + * @detached: set on driver unbind; open/ioctl return -ENODEV afterward */ struct sbtsi_data { union { struct i2c_client *client; struct i3c_device *i3cdev; }; + struct miscdevice sbtsi_misc_dev; + struct mutex lock; /* protects concurrent access to the device */ + struct kref kref; u8 dev_addr; bool ext_range_mode; bool read_order; bool is_i3c; + bool detached; }; +DEFINE_GUARD(sbtsi, struct sbtsi_data *, mutex_lock(&_T->lock), + mutex_unlock(&_T->lock)) + /* * Name of the auxiliary device published on the auxiliary bus by the core * driver. The full device name is "amd-sbtsi.temp-sensor.<id>". where |