| Message ID | 1982172.z1FZmGBJNL@vostro.rjw.lan (mailing list archive) |
|---|---|
| State | Superseded, archived |
| Headers | show |
On Saturday, January 19, 2013 09:53:32 PM Rafael J. Wysocki wrote: > From: Rafael J. Wysocki <rafael.j.wysocki@intel.com> > Subject: ACPI / PM: Export power states of ACPI devices via sysfs > > Make it possible to retrieve the current power state of a device with > ACPI power management from user space via sysfs by adding a new > attribute power_state to the sysfs directory associated with the > struct acpi_device object representing the device's ACPI node. > > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> > --- > > I've changed my mind here. It looks like it's more convenient to put the > power_state attribute directly into the ACPI device node's directory in sysfs > rather than into its power subdirectory. Well, please scratch this, I'm dropping it for now. I'll send a new version shortly along with the patches that export power resources information. Thanks, Rafael > --- > Documentation/ABI/testing/sysfs-devices-power | 13 +++++++++++++ > drivers/acpi/scan.c | 25 ++++++++++++++++++++++++- > 2 files changed, 37 insertions(+), 1 deletion(-) > > Index: linux-pm/drivers/acpi/scan.c > =================================================================== > --- linux-pm.orig/drivers/acpi/scan.c > +++ linux-pm/drivers/acpi/scan.c > @@ -184,6 +184,19 @@ err_out: > } > EXPORT_SYMBOL(acpi_bus_hot_remove_device); > > +static ssize_t power_state_show(struct device *dev, > + struct device_attribute *attr, char *buf) > +{ > + struct acpi_device *adev = to_acpi_device(dev); > + int state; > + int ret; > + > + ret = acpi_device_get_power(adev, &state); > + return ret ? ret : sprintf(buf, "%s\n", acpi_power_state_string(state)); > +} > + > +static DEVICE_ATTR(power_state, 0444, power_state_show, NULL); > + > static ssize_t > acpi_eject_store(struct device *d, struct device_attribute *attr, > const char *buf, size_t count) > @@ -375,8 +388,15 @@ static int acpi_device_setup_files(struc > * hot-removal function from userland. > */ > status = acpi_get_handle(dev->handle, "_EJ0", &temp); > - if (ACPI_SUCCESS(status)) > + if (ACPI_SUCCESS(status)) { > result = device_create_file(&dev->dev, &dev_attr_eject); > + if (result) > + goto end; > + } > + > + if (dev->flags.power_manageable) > + result = device_create_file(&dev->dev, &dev_attr_power_state); > + > end: > return result; > } > @@ -386,6 +406,9 @@ static void acpi_device_remove_files(str > acpi_status status; > acpi_handle temp; > > + if (dev->flags.power_manageable) > + device_remove_file(&dev->dev, &dev_attr_power_state); > + > /* > * If device has _STR, remove 'description' file > */ > > -- > To unsubscribe from this list: send the line "unsubscribe linux-acpi" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html
Index: linux-pm/drivers/acpi/scan.c =================================================================== --- linux-pm.orig/drivers/acpi/scan.c +++ linux-pm/drivers/acpi/scan.c @@ -184,6 +184,19 @@ err_out: } EXPORT_SYMBOL(acpi_bus_hot_remove_device); +static ssize_t power_state_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct acpi_device *adev = to_acpi_device(dev); + int state; + int ret; + + ret = acpi_device_get_power(adev, &state); + return ret ? ret : sprintf(buf, "%s\n", acpi_power_state_string(state)); +} + +static DEVICE_ATTR(power_state, 0444, power_state_show, NULL); + static ssize_t acpi_eject_store(struct device *d, struct device_attribute *attr, const char *buf, size_t count) @@ -375,8 +388,15 @@ static int acpi_device_setup_files(struc * hot-removal function from userland. */ status = acpi_get_handle(dev->handle, "_EJ0", &temp); - if (ACPI_SUCCESS(status)) + if (ACPI_SUCCESS(status)) { result = device_create_file(&dev->dev, &dev_attr_eject); + if (result) + goto end; + } + + if (dev->flags.power_manageable) + result = device_create_file(&dev->dev, &dev_attr_power_state); + end: return result; } @@ -386,6 +406,9 @@ static void acpi_device_remove_files(str acpi_status status; acpi_handle temp; + if (dev->flags.power_manageable) + device_remove_file(&dev->dev, &dev_attr_power_state); + /* * If device has _STR, remove 'description' file */