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Message-ID: <CAOvb9yjkTX1TgpTBfWWrv9rO-szRAre0EeTDj8aogwYQ=PVDiQ@mail.gmail.com>
Date: Fri, 28 Jan 2022 10:03:54 -0800
From: Won Chung <wonchung@...gle.com>
To: "Rafael J. Wysocki" <rafael@...nel.org>
Cc: Len Brown <lenb@...nel.org>, Benson Leung <bleung@...omium.org>,
Prashant Malani <pmalani@...omium.org>,
ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] ACPI: device_sysfs: Add sysfs support for _PLD
On Fri, Jan 28, 2022 at 4:04 AM Rafael J. Wysocki <rafael@...nel.org> wrote:
>
> On Fri, Jan 28, 2022 at 12:45 AM Won Chung <wonchung@...gle.com> wrote:
> >
> > When ACPI table includes _PLD fields for a device, create a new file
> > (pld) in sysfs to share _PLD fields.
> >
> > Signed-off-by: Won Chung <wonchung@...gle.com>
> > ---
> > Documentation/ABI/testing/sysfs-bus-acpi | 53 ++++++++++++++++++++++++
> > drivers/acpi/device_sysfs.c | 42 +++++++++++++++++++
> > 2 files changed, 95 insertions(+)
> >
> > diff --git a/Documentation/ABI/testing/sysfs-bus-acpi b/Documentation/ABI/testing/sysfs-bus-acpi
> > index 58abacf59b2a..7f4544c9d563 100644
> > --- a/Documentation/ABI/testing/sysfs-bus-acpi
> > +++ b/Documentation/ABI/testing/sysfs-bus-acpi
> > @@ -96,3 +96,56 @@ Description:
> > hardware, if the _HRV control method is present. It is mostly
> > useful for non-PCI devices because lspci can list the hardware
> > version for PCI devices.
> > +
> > +What: /sys/bus/acpi/devices/.../pld
> > +Date: Jan, 2022
> > +Contact: Rafael J. Wysocki <rjw@...ysocki.net>
>
> Why do you think that it is appropriate to add contact information of
> someone to ABI documentation without asking them for their opinion?
>
> If you don't want to be the contact yourself, you can put linux-acpi in there.
Hi Rafael,
Sorry for that. I thought I had to put the maintainer's contact there
since everything else in this file has your name and it's being sent
to you for a review. I actually sent another follow up email in this
email thread with the contact information changed to my name, but I
think I also did that incorrectly since I did not change the version
number in the email title. I will correctly send a new one.
Won
>
> > +Description:
> > + This attribute contains the output of the device object's
> > + _PLD control method, if present. This information provides
> > + details on physical location of a port.
> > +
> > + Description on each _PLD field from ACPI specification:
> > +
> > + =============== ============================================
> > + GROUP_TOKEN Unique numerical value identifying a group.
> > + GROUP_POSITION Identifies this device connection point’s
> > + position in the group.
> > + USER_VISIBLE Set if the device connection point can be
> > + seen by the user without disassembly.
> > + DOCK Set if the device connection point resides
> > + in a docking station or port replicator.
> > + BAY Set if describing a device in a bay or if
> > + device connection point is a bay.
> > + LID Set if this device connection point resides
> > + on the lid of laptop system.
> > + PANEL Describes which panel surface of the system’s
> > + housing the device connection point resides on:
> > + 0 - Top
> > + 1 - Bottom
> > + 2 - Left
> > + 3 - Right
> > + 4 - Front
> > + 5 - Back
> > + 6 - Unknown (Vertical Position and Horizontal
> > + Position will be ignored)
> > + HORIZONTAL_ 0 - Left
> > + POSITION 1 - Center
> > + 2 - Right
> > + VERTICAL_ 0 - Upper
> > + POSITION 1 - Center
> > + 2 - Lower
> > + SHAPE Describes the shape of the device connection
> > + point.
> > + 0 - Round
> > + 1 - Oval
> > + 2 - Square
> > + 3 - Vertical Rectangle
> > + 4 - Horizontal Rectangle
> > + 5 - Vertical Trapezoid
> > + 6 - Horizontal Trapezoid
> > + 7 - Unknown - Shape rendered as a Rectangle
> > + with dotted lines
> > + 8 - Chamfered
> > + 15:9 - Reserved
> > + =============== ===============================================
> > diff --git a/drivers/acpi/device_sysfs.c b/drivers/acpi/device_sysfs.c
> > index d5d6403ba07b..8d4df5fb1c45 100644
> > --- a/drivers/acpi/device_sysfs.c
> > +++ b/drivers/acpi/device_sysfs.c
> > @@ -509,6 +509,40 @@ static ssize_t status_show(struct device *dev, struct device_attribute *attr,
> > }
> > static DEVICE_ATTR_RO(status);
> >
> > +static ssize_t pld_show(struct device *dev, struct device_attribute *attr,
> > + char *buf)
> > +{
> > + struct acpi_device *acpi_dev = to_acpi_device(dev);
> > + acpi_status status;
> > + struct acpi_pld_info *pld;
> > +
> > + status = acpi_get_physical_device_location(acpi_dev->handle, &pld);
> > + if (ACPI_FAILURE(status))
> > + return -ENODEV;
> > +
> > + return sprintf(buf, "GROUP_TOKEN=%u\n"
> > + "GROUP_POSITION=%u\n"
> > + "USER_VISIBLE=%u\n"
> > + "DOCK=%u\n"
> > + "BAY=%u\n"
> > + "LID=%u\n"
> > + "PANEL=%u\n"
> > + "HORIZONTAL_POSITION=%u\n"
> > + "VERTICAL_POSITION=%u\n"
> > + "SHAPE=%u\n",
> > + pld->group_token,
> > + pld->group_position,
> > + pld->user_visible,
> > + pld->dock,
> > + pld->bay,
> > + pld->lid,
> > + pld->panel,
> > + pld->horizontal_position,
> > + pld->vertical_position,
> > + pld->shape);
> > +}
> > +static DEVICE_ATTR_RO(pld);
> > +
> > /**
> > * acpi_device_setup_files - Create sysfs attributes of an ACPI device.
> > * @dev: ACPI device object.
> > @@ -595,6 +629,12 @@ int acpi_device_setup_files(struct acpi_device *dev)
> > &dev_attr_real_power_state);
> > }
> >
> > + if (acpi_has_method(dev->handle, "_PLD")) {
> > + result = device_create_file(&dev->dev, &dev_attr_pld);
> > + if (result)
> > + goto end;
> > + }
> > +
> > acpi_expose_nondev_subnodes(&dev->dev.kobj, &dev->data);
> >
> > end:
> > @@ -645,4 +685,6 @@ void acpi_device_remove_files(struct acpi_device *dev)
> > device_remove_file(&dev->dev, &dev_attr_status);
> > if (dev->handle)
> > device_remove_file(&dev->dev, &dev_attr_path);
> > + if (acpi_has_method(dev->handle, "_PLD"))
> > + device_remove_file(&dev->dev, &dev_attr_pld);
> > }
> > --
> > 2.35.0.rc0.227.g00780c9af4-goog
> >
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