[PATCH] ACPI: Add sysfs interface for acpi device wakeup
From: Yi Yang
Date: Thu Jan 10 2008 - 02:16:23 EST
Subject: ACPI: convert procfs to sysfs for /proc/acpi/wakeup
From: Yi Yang <yi.y.yang@xxxxxxxxx>
/proc/acpi/wakeup is deprecated but it has to exist because
we haven't a sysfs interface to replace it yet, this patch
converts /proc/acpi/wakeup to sysfs interface, under every
acpi device sysfs node, a user can see a directory "wakeup"
if the acpi device can support wakeup, there are six files
under this directory:
acpi_bus_id bus_id pci_id run_wakeup sleep_state status
All the files are read-only exclude "status" which is used
to enable or disable wakeup of the acpi device.
"acpi_bus_id" is acpi bus ID of the acpi device.
"bus_id" is pci bus id of the device associated to the acpi
device, it will be empty if there isn't any device associated
to it.
"pci_id" is PCI ID of the pci device associated to the acpi
device, it will be empty if there isn't any device associated
to it.
"run_wake" is a flag indicating if a wakeup process is being
handled.
"sleep_state" is sleep state of the acpi device such as "S0".
"status" is wakeup status of the acpi device, it is enabled
or disabled, a user can change it be echoing "0", "1",
"disabled" or "enabled" to /sys/devices/.../wakeup/status.
Here is the test result:
[root@localhost ~]# cat /proc/acpi/wakeup
Device S-state Status Sysfs node PCI ID
C093 S5 disabled pci:0000:00:1e.0 0x2448
C0E8 S3 disabled pci:0000:00:1d.0 0x27c8
C0EF S3 disabled pci:0000:00:1d.1 0x27c9
C0F0 S3 disabled pci:0000:00:1d.2 0x27ca
C0F1 S3 disabled pci:0000:00:1d.3 0x27cb
C0F2 S3 disabled pci:0000:00:1d.7 0x27cc
C0F9 S0 disabled pci:0000:00:1c.0 0x27d0
C21D S0 disabled pci:0000:08:00.0 0x16fd
C109 S5 disabled pci:0000:00:1c.1 0x27d2
C228 S5 disabled pci:0000:10:00.0 0x4222
C10F S5 disabled pci:0000:00:1c.3 0x27d6
C229 S5 disabled
[root@localhost ~]# find /sys -name "*" | grep sleep_state
/sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:05/wakeup/sleep_state
/sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:0d/wakeup/sleep_state
/sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:11/wakeup/sleep_state
/sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:15/wakeup/sleep_state
/sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:19/wakeup/sleep_state
/sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:1d/wakeup/sleep_state
/sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:2b/wakeup/sleep_state
/sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:2b/device:2c/wakeup/sleep_state
/sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:2d/wakeup/sleep_state
/sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:2d/device:2e/wakeup/sleep_state
/sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:2f/wakeup/sleep_state
/sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:2f/device:30/wakeup/sleep_state
[root@localhost ~]# ls /sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:2f/device:30/wakeup
acpi_bus_id bus_id pci_id run_wakeup sleep_state status
[root@localhost ~]# cat /sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:2f/device:30/acpi_bus_id
cat: /sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:2f/device:30/acpi_bus_id: No such file or directory
[root@localhost ~]# cat /sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:2f/device:30/wakeup/acpi_bus_id
C229
[root@localhost ~]# cat /sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:2f/device:30/wakeup/sleep_state
S5
[root@localhost ~]# cat /sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:2f/device:30/wakeup/status
disabled
[root@localhost ~]# cat /sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:2f/device:30/wakeup/bus_id
[root@localhost ~]# cat /sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:2f/device:30/wakeup/pci_id
[root@localhost ~]# echo 1 > /sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:2f/device:30/wakeup/status
[root@localhost ~]# cat /sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:2f/device:30/wakeup/status
enabled
[root@localhost ~]# cat /proc/acpi/wakeup
Device S-state Status Sysfs node PCI ID
C093 S5 disabled pci:0000:00:1e.0 0x2448
C0E8 S3 disabled pci:0000:00:1d.0 0x27c8
C0EF S3 disabled pci:0000:00:1d.1 0x27c9
C0F0 S3 disabled pci:0000:00:1d.2 0x27ca
C0F1 S3 disabled pci:0000:00:1d.3 0x27cb
C0F2 S3 disabled pci:0000:00:1d.7 0x27cc
C0F9 S0 enabled pci:0000:00:1c.0 0x27d0
C21D S0 enabled pci:0000:08:00.0 0x16fd
C109 S5 enabled pci:0000:00:1c.1 0x27d2
C228 S5 enabled pci:0000:10:00.0 0x4222
C10F S5 enabled pci:0000:00:1c.3 0x27d6
C229 S5 enabled
[root@localhost ~]# vi /var/log/dmesg
[root@localhost ~]# dmesg | grep "same GPE"
ACPI: 'C0F9' and 'C229' have the same GPE, can't disable/enable one seperately
ACPI: 'C21D' and 'C229' have the same GPE, can't disable/enable one seperately
ACPI: 'C109' and 'C229' have the same GPE, can't disable/enable one seperately
ACPI: 'C228' and 'C229' have the same GPE, can't disable/enable one seperately
ACPI: 'C10F' and 'C229' have the same GPE, can't disable/enable one seperately
[root@localhost ~]# cat /sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/*/wakeup/status
disabled
disabled
disabled
disabled
disabled
disabled
enabled
enabled
enabled
[root@localhost ~]# cat /sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/*/*/wakeup/status
enabled
enabled
enabled
[root@localhost ~]#
Signed-off-by: Yi Yang <yi.y.yang@xxxxxxxxx>
---
scan.c | 184 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 180 insertions(+), 4 deletions(-)
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 5b4d462..c3786a0 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -6,8 +6,10 @@
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/acpi.h>
+#include <linux/pci.h>
#include <acpi/acpi_drivers.h>
+#include <acpi/acpi_bus.h>
#include <acpi/acinterp.h> /* for acpi_ex_eisa_id_to_string() */
#define _COMPONENT ACPI_BUS_COMPONENT
@@ -188,8 +190,171 @@ acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *b
end:
return result;
}
+
static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
+static char enabled[] = "enabled";
+static char disabled[] = "disabled";
+static char unsupported[] = "unsupported";
+
+static ssize_t
+acpi_device_status_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct acpi_device *acpi_dev = to_acpi_device(dev);
+ int result = 0;
+ char *tmpp = NULL;
+
+ if (!acpi_dev->wakeup.flags.valid)
+ tmpp = unsupported;
+ else
+ tmpp = acpi_dev->wakeup.state.enabled ? enabled : disabled;
+ result = sprintf(buf, "%s\n", tmpp);
+ return result;
+}
+
+static ssize_t
+acpi_device_status_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct list_head *node, *next;
+ struct acpi_device *acpi_dev = to_acpi_device(dev);
+ size_t len = count;
+ char *tmpp = NULL;
+
+ tmpp = memchr(buf, '\n', count);
+ if (tmpp != NULL)
+ len = tmpp - buf;
+
+ spin_lock(&acpi_device_lock);
+ if ((len == 1) && ((buf[0] == '0') || (buf[0] == '1')))
+ acpi_dev->wakeup.state.enabled = buf[0] - '0';
+ else if ((len == strlen(enabled))
+ && (strnicmp(buf, enabled, strlen(enabled)) == 0))
+ acpi_dev->wakeup.state.enabled = 1;
+ else if ((len == strlen(disabled))
+ && (strnicmp(buf, disabled, strlen(disabled)) == 0))
+ acpi_dev->wakeup.state.enabled = 0;
+ else {
+ spin_unlock(&acpi_device_lock);
+ return -EINVAL;
+ }
+
+ list_for_each_safe(node, next, &acpi_wakeup_device_list) {
+ struct acpi_device *dev = container_of(node,
+ struct
+ acpi_device,
+ wakeup_list);
+
+ if ((dev != acpi_dev)
+ && (dev->wakeup.gpe_number == acpi_dev->wakeup.gpe_number)
+ && (dev->wakeup.gpe_device ==
+ acpi_dev->wakeup.gpe_device)) {
+ printk(KERN_WARNING
+ "ACPI: '%s' and '%s' have the same GPE, "
+ "can't disable/enable one seperately\n",
+ dev->pnp.bus_id, acpi_dev->pnp.bus_id);
+ dev->wakeup.state.enabled =
+ acpi_dev->wakeup.state.enabled;
+ }
+ }
+ spin_unlock(&acpi_device_lock);
+
+ return count;
+}
+
+static DEVICE_ATTR(status, 0644, acpi_device_status_show,
+ acpi_device_status_store);
+
+static ssize_t
+acpi_device_acpi_bus_id_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct acpi_device *acpi_dev = to_acpi_device(dev);
+
+ return sprintf(buf, "%s\n", acpi_dev->pnp.bus_id);
+}
+
+static DEVICE_ATTR(acpi_bus_id, 0444, acpi_device_acpi_bus_id_show, NULL);
+
+
+static ssize_t
+acpi_device_sleep_state_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct acpi_device *acpi_dev = to_acpi_device(dev);
+
+ return sprintf(buf, "S%d\n", (u32) acpi_dev->wakeup.sleep_state);
+}
+
+static DEVICE_ATTR(sleep_state, 0444, acpi_device_sleep_state_show, NULL);
+
+static ssize_t
+acpi_device_run_wakeup_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct acpi_device *acpi_dev = to_acpi_device(dev);
+
+ return sprintf(buf, "%d\n", acpi_dev->wakeup.flags.run_wake ? 1 : 0);
+}
+
+static DEVICE_ATTR(run_wakeup, 0444, acpi_device_run_wakeup_show, NULL);
+
+static ssize_t
+acpi_device_bus_id_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct acpi_device *acpi_dev = to_acpi_device(dev);
+ struct device *ldev = NULL;
+ int result = 0;
+
+ ldev = acpi_get_physical_device(acpi_dev->handle);
+ if (ldev)
+ result = sprintf(buf, "%s:%s\n",
+ ldev->bus ? ldev->bus->name : "no-bus",
+ ldev->bus_id);
+ else
+ result = sprintf(buf, "\n");
+
+ return result;
+}
+
+static DEVICE_ATTR(bus_id, 0444, acpi_device_bus_id_show, NULL);
+
+static ssize_t
+acpi_device_pci_id_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct acpi_device *acpi_dev = to_acpi_device(dev);
+ struct device *ldev = NULL;
+ int result = 0;
+
+ ldev = acpi_get_physical_device(acpi_dev->handle);
+ if (ldev)
+ result = sprintf(buf, "0x%04x\n", to_pci_dev(ldev)->device);
+ else
+ result = sprintf(buf, "\n");
+
+ return result;
+}
+
+static DEVICE_ATTR(pci_id, 0444, acpi_device_pci_id_show, NULL);
+
+static struct attribute *acpi_wakeup_attrs[] = {
+ &dev_attr_acpi_bus_id.attr,
+ &dev_attr_sleep_state.attr,
+ &dev_attr_status.attr,
+ &dev_attr_run_wakeup.attr,
+ &dev_attr_bus_id.attr,
+ &dev_attr_pci_id.attr,
+ NULL,
+};
+
+static struct attribute_group acpi_wakeup_attr_group = {
+ .name = "wakeup",
+ .attrs = acpi_wakeup_attrs,
+};
+
static int acpi_device_setup_files(struct acpi_device *dev)
{
acpi_status status;
@@ -201,19 +366,19 @@ static int acpi_device_setup_files(struct acpi_device *dev)
*/
if(dev->handle) {
result = device_create_file(&dev->dev, &dev_attr_path);
- if(result)
+ if (result)
goto end;
}
if(dev->flags.hardware_id) {
result = device_create_file(&dev->dev, &dev_attr_hid);
- if(result)
+ if (result)
goto end;
}
if (dev->flags.hardware_id || dev->flags.compatible_ids){
result = device_create_file(&dev->dev, &dev_attr_modalias);
- if(result)
+ if (result)
goto end;
}
@@ -222,8 +387,16 @@ static int acpi_device_setup_files(struct acpi_device *dev)
* 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->wakeup.flags.valid)
+ result = sysfs_create_group(&dev->dev.kobj,
+ &acpi_wakeup_attr_group);
+
end:
return result;
}
@@ -248,6 +421,9 @@ static void acpi_device_remove_files(struct acpi_device *dev)
device_remove_file(&dev->dev, &dev_attr_hid);
if(dev->handle)
device_remove_file(&dev->dev, &dev_attr_path);
+
+ if (dev->wakeup.flags.valid)
+ sysfs_remove_group(&dev->dev.kobj, &acpi_wakeup_attr_group);
}
/* --------------------------------------------------------------------------
ACPI Bus operations
--
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