Hi
I recently thought about using coldplug (/etc/hotplug/*.rc) scripts to
automagically load modules responsible for ACPI-controlled devices such
as button, battery, laptop extras. To accomplish this I wrote a trivial
kernel patch which exports the ACPI device _HID and _CID attributes in
the corresponding sysfs node. I also wrote a script for /etc/hotplug
which scans the /sys tree and loads modules according to HIDs exported.
Patch is an attachment because my mail client has a maximum line length
limit. The patch is against 2.6.17.
--
| ******* Maciek Grela RV409b *********
| JID: [EMAIL PROTECTED]
| Linux user #319794 ++ There is no spoon ...
diff -rup --exclude-from=patch.exclude linux-2.6.17/drivers/acpi/scan.c linux-2.6.17-th/drivers/acpi/scan.c
--- linux-2.6.17/drivers/acpi/scan.c 2006-06-18 01:49:35.000000000 +0000
+++ linux-2.6.17-th/drivers/acpi/scan.c 2006-07-09 00:16:05.423442000 +0000
@@ -351,11 +351,19 @@ static int acpi_bus_get_wakeup_device_fl
static ssize_t acpi_eject_store(struct acpi_device *device,
const char *buf, size_t count);
+static ssize_t acpi_hid_show(struct acpi_device *device,
+ char *buf);
+
+static ssize_t acpi_cid_show(struct acpi_device *device,
+ char *buf);
+
#define ACPI_DEVICE_ATTR(_name,_mode,_show,_store) \
static struct acpi_device_attribute acpi_device_attr_##_name = \
__ATTR(_name, _mode, _show, _store)
ACPI_DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
+ACPI_DEVICE_ATTR(hid, 0400, acpi_hid_show, NULL);
+ACPI_DEVICE_ATTR(cid, 0400, acpi_cid_show, NULL);
/**
* setup_sys_fs_device_files - sets up the device files under device namespace
@@ -376,6 +384,15 @@ setup_sys_fs_device_files(struct acpi_de
status = acpi_get_handle(dev->handle, "_EJ0", &temp);
if (ACPI_SUCCESS(status))
(*(func)) (&dev->kobj, &acpi_device_attr_eject.attr);
+
+ if ( dev->pnp.cid_list ) {
+ (*(func)) (&dev->kobj, &acpi_device_attr_cid.attr);
+ }
+
+ if ( dev->pnp.hardware_id[0] != 0 ) {
+ (*(func)) (&dev->kobj, &acpi_device_attr_hid.attr);
+ }
+
}
static int acpi_eject_operation(acpi_handle handle, int lockable)
@@ -456,6 +473,29 @@ acpi_eject_store(struct acpi_device *dev
return ret;
}
+static ssize_t acpi_hid_show(struct acpi_device *device,
+ char *buf)
+{
+ return snprintf(buf, PAGE_SIZE, "%s\n",device->pnp.hardware_id);
+}
+
+static ssize_t acpi_cid_show(struct acpi_device *device,
+ char *buf)
+{
+ int ret = 0;
+ int buflen = PAGE_SIZE;
+ int i,w;
+
+ for (i = 0; i < device->pnp.cid_list->count; i++, ret+=w, buflen-=w, buf+=w ) {
+ w = snprintf(buf, buflen, "%s ", device->pnp.cid_list->id[i].value);
+ }
+
+ ret += snprintf(buf, buflen, "\n");
+
+ return ret;
+}
+
+
/* --------------------------------------------------------------------------
Performance Management
-------------------------------------------------------------------------- */
