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platform/x86: thinkpad_acpi: Fix warning about deprecated hwmon_device_register

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Use hwmon_device_register_with_groups instead of deprecated
hwmon_device_register and fix a dmesg warning.

This patch however changes the userspace API.
hwmon_device_register_with_groups takes `hwmon' name as an argument and
creates a name file in the `hwmon' device, not in the `platform_device'.
This allows us to remove custom `name' device attribute, but in order to
make lm-sensors happy we also have to move fans and thermal attributes
to the `hwmon' device.

Even though this patch changes userspace API, it's still compatible with
the lm-sensors. Starting with lm-sensors 3.0 (circa 2007), it looks at
both hwmon and the backing device for the name and other attributes.

before:
$ cat /sys/devices/platform/thinkpad_hwmon/{name,fan1_input}
thinkpad
2007
$ cat /sys/devices/platform/thinkpad_hwmon/hwmon/hwmon1/{name,fan1_input}
cat: /sys/devices/platform/thinkpad_hwmon/hwmon/hwmon1/name: No such file or directory
cat: /sys/devices/platform/thinkpad_hwmon/hwmon/hwmon1/fan1_input: No such file or directory
$ cat /sys/class/hwmon/hwmon1/{name,fan1_input}
cat: /sys/class/hwmon/hwmon1/name: No such file or directory
cat: /sys/class/hwmon/hwmon1/fan1_input: No such file or directory
$ sensors
thinkpad-isa-0000
Adapter: ISA adapter
fan1:        3533 RPM

after:
$ cat /sys/devices/platform/thinkpad_hwmon/{name,fan1_input}
cat: /sys/devices/platform/thinkpad_hwmon/name: No such file or directory
cat: /sys/devices/platform/thinkpad_hwmon/fan1_input: No such file or directory
$ cat /sys/devices/platform/thinkpad_hwmon/hwmon/hwmon1/{name,fan1_input}
thinkpad
3478
$ cat /sys/class/hwmon/hwmon1/{name,fan1_input}
thinkpad
3478
$ sensors
thinkpad-isa-0000
Adapter: ISA adapter
fan1:        3489 RPM

$ sensors -v
sensors version 3.4.0 with libsensors version 3.4.0

Signed-off-by: Stanislav Fomichev <kernel@fomichev.me>
[dvhart: cleaned up commit log, bumped version to 4.14 in the doc change]
Signed-off-by: Darren Hart (VMware) <dvhart@infradead.org>
This commit is contained in:
Stanislav Fomichev 2017-06-20 20:45:13 -07:00 committed by Darren Hart (VMware)
parent 6afa1e2a32
commit 6b99e3569b
2 changed files with 18 additions and 29 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
Documentation/laptops/thinkpad-acpi.txt
View File

@ -121,8 +121,9 @@ space, for 2.6.23+ this is /sys/devices/platform/thinkpad_acpi/.
Sysfs device attributes for the sensors and fan are on the
thinkpad_hwmon device's sysfs attribute space, but you should locate it
looking for a hwmon device with the name attribute of "thinkpad", or
better yet, through libsensors.
better yet, through libsensors. For 4.14+ sysfs attributes were moved to the
hwmon device (/sys/bus/platform/devices/thinkpad_hwmon/hwmon/hwmon? or
/sys/class/hwmon/hwmon?).
Driver version
--------------
@ -1478,3 +1479,7 @@ Sysfs interface changelog:
0x020700: Support for mute-only mixers.
Volume control in read-only mode by default.
Marker for ALSA mixer support.
0x030000: Thermal and fan sysfs attributes were moved to the hwmon
device instead of being attached to the backing platform
device.

38
drivers/platform/x86/thinkpad_acpi.c
View File

@ -24,7 +24,7 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#define TPACPI_VERSION "0.25"
#define TPACPI_SYSFS_VERSION 0x020700
#define TPACPI_SYSFS_VERSION 0x030000
/*
* Changelog:
@ -6342,7 +6342,7 @@ static int __init thermal_init(struct ibm_init_struct *iibm)
switch (thermal_read_mode) {
case TPACPI_THERMAL_TPEC_16:
res = sysfs_create_group(&tpacpi_sensors_pdev->dev.kobj,
res = sysfs_create_group(&tpacpi_hwmon->kobj,
&thermal_temp_input16_group);
if (res)
return res;
@ -6350,7 +6350,7 @@ static int __init thermal_init(struct ibm_init_struct *iibm)
case TPACPI_THERMAL_TPEC_8:
case TPACPI_THERMAL_ACPI_TMP07:
case TPACPI_THERMAL_ACPI_UPDT:
res = sysfs_create_group(&tpacpi_sensors_pdev->dev.kobj,
res = sysfs_create_group(&tpacpi_hwmon->kobj,
&thermal_temp_input8_group);
if (res)
return res;
@ -6367,13 +6367,13 @@ static void thermal_exit(void)
{
switch (thermal_read_mode) {
case TPACPI_THERMAL_TPEC_16:
sysfs_remove_group(&tpacpi_sensors_pdev->dev.kobj,
sysfs_remove_group(&tpacpi_hwmon->kobj,
&thermal_temp_input16_group);
break;
case TPACPI_THERMAL_TPEC_8:
case TPACPI_THERMAL_ACPI_TMP07:
case TPACPI_THERMAL_ACPI_UPDT:
sysfs_remove_group(&tpacpi_sensors_pdev->dev.kobj,
sysfs_remove_group(&tpacpi_hwmon->kobj,
&thermal_temp_input8_group);
break;
case TPACPI_THERMAL_NONE:
@ -8696,7 +8696,7 @@ static int __init fan_init(struct ibm_init_struct *iibm)
fan_attributes[ARRAY_SIZE(fan_attributes)-2] =
&dev_attr_fan2_input.attr;
}
rc = sysfs_create_group(&tpacpi_sensors_pdev->dev.kobj,
rc = sysfs_create_group(&tpacpi_hwmon->kobj,
&fan_attr_group);
if (rc < 0)
return rc;
@ -8704,7 +8704,7 @@ static int __init fan_init(struct ibm_init_struct *iibm)
rc = driver_create_file(&tpacpi_hwmon_pdriver.driver,
&driver_attr_fan_watchdog);
if (rc < 0) {
sysfs_remove_group(&tpacpi_sensors_pdev->dev.kobj,
sysfs_remove_group(&tpacpi_hwmon->kobj,
&fan_attr_group);
return rc;
}
@ -8719,7 +8719,7 @@ static void fan_exit(void)
"cancelling any pending fan watchdog tasks\n");
/* FIXME: can we really do this unconditionally? */
sysfs_remove_group(&tpacpi_sensors_pdev->dev.kobj, &fan_attr_group);
sysfs_remove_group(&tpacpi_hwmon->kobj, &fan_attr_group);
driver_remove_file(&tpacpi_hwmon_pdriver.driver,
&driver_attr_fan_watchdog);
@ -9149,16 +9149,6 @@ static void hotkey_driver_event(const unsigned int scancode)
tpacpi_driver_event(TP_HKEY_EV_HOTKEY_BASE + scancode);
}
/* sysfs name ---------------------------------------------------------- */
static ssize_t thinkpad_acpi_pdev_name_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
return snprintf(buf, PAGE_SIZE, "%s\n", TPACPI_NAME);
}
static DEVICE_ATTR(name, S_IRUGO, thinkpad_acpi_pdev_name_show, NULL);
/* --------------------------------------------------------------------- */
/* /proc support */
@ -9696,8 +9686,6 @@ static void thinkpad_acpi_module_exit(void)
if (tpacpi_hwmon)
hwmon_device_unregister(tpacpi_hwmon);
if (tp_features.sensors_pdev_attrs_registered)
device_remove_file(&tpacpi_sensors_pdev->dev, &dev_attr_name);
if (tpacpi_sensors_pdev)
platform_device_unregister(tpacpi_sensors_pdev);
if (tpacpi_pdev)
@ -9818,14 +9806,10 @@ static int __init thinkpad_acpi_module_init(void)
thinkpad_acpi_module_exit();
return ret;
}
ret = device_create_file(&tpacpi_sensors_pdev->dev, &dev_attr_name);
if (ret) {
pr_err("unable to create sysfs hwmon device attributes\n");
thinkpad_acpi_module_exit();
return ret;
}
tp_features.sensors_pdev_attrs_registered = 1;
tpacpi_hwmon = hwmon_device_register(&tpacpi_sensors_pdev->dev);
tpacpi_hwmon = hwmon_device_register_with_groups(
&tpacpi_sensors_pdev->dev, TPACPI_NAME, NULL, NULL);
if (IS_ERR(tpacpi_hwmon)) {
ret = PTR_ERR(tpacpi_hwmon);
tpacpi_hwmon = NULL;