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authorMatthew Garrett <mjg@redhat.com>2009-01-20 16:17:48 +0100
committerLen Brown <len.brown@intel.com>2009-01-20 14:36:53 -0500
commit5740294ca3a9b113fe146f2826effb69ca50008d (patch)
tree00e571fce1111310ef4e12801a657aeaf80ae77f /drivers/platform/x86
parentc9ddf8fede1271bde0a512fa94f77c4cb1ef4040 (diff)
eeepc-laptop: Implement rfkill hotplugging in eeepc-laptop
The Eee implements rfkill by logically unplugging the wireless card from the PCI bus. Despite sending ACPI notifications, this does not appear to be implemented using standard ACPI hotplug - nor does the firmware provide the _OSC method required to support native PCIe hotplug. The only sensible choice appears to be to handle the hotplugging directly in the eeepc-laptop driver. Tested successfully on a 700, 900 and 901. Signed-off-by: Matthew Garrett <mjg@redhat.com> Signed-off-by: Corentin Chary <corentincj@iksaif.net> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/platform/x86')
-rw-r--r--drivers/platform/x86/eeepc-laptop.c83
1 files changed, 83 insertions, 0 deletions
diff --git a/drivers/platform/x86/eeepc-laptop.c b/drivers/platform/x86/eeepc-laptop.c
index 21e5206ed28..66655d2b4ce 100644
--- a/drivers/platform/x86/eeepc-laptop.c
+++ b/drivers/platform/x86/eeepc-laptop.c
@@ -30,6 +30,7 @@
#include <linux/uaccess.h>
#include <linux/input.h>
#include <linux/rfkill.h>
+#include <linux/pci.h>
#define EEEPC_LAPTOP_VERSION "0.1"
@@ -517,6 +518,41 @@ static void notify_brn(void)
bd->props.brightness = read_brightness(bd);
}
+static void eeepc_rfkill_notify(acpi_handle handle, u32 event, void *data)
+{
+ struct pci_dev *dev;
+ struct pci_bus *bus = pci_find_bus(0, 1);
+
+ if (event != ACPI_NOTIFY_BUS_CHECK)
+ return;
+
+ if (!bus) {
+ printk(EEEPC_WARNING "Unable to find PCI bus 1?\n");
+ return;
+ }
+
+ if (get_acpi(CM_ASL_WLAN) == 1) {
+ dev = pci_get_slot(bus, 0);
+ if (dev) {
+ /* Device already present */
+ pci_dev_put(dev);
+ return;
+ }
+ dev = pci_scan_single_device(bus, 0);
+ if (dev) {
+ pci_bus_assign_resources(bus);
+ if (pci_bus_add_device(dev))
+ printk(EEEPC_ERR "Unable to hotplug wifi\n");
+ }
+ } else {
+ dev = pci_get_slot(bus, 0);
+ if (dev) {
+ pci_remove_bus_device(dev);
+ pci_dev_put(dev);
+ }
+ }
+}
+
static void eeepc_hotk_notify(acpi_handle handle, u32 event, void *data)
{
static struct key_entry *key;
@@ -543,6 +579,45 @@ static void eeepc_hotk_notify(acpi_handle handle, u32 event, void *data)
}
}
+static int eeepc_register_rfkill_notifier(char *node)
+{
+ acpi_status status = AE_OK;
+ acpi_handle handle;
+
+ status = acpi_get_handle(NULL, node, &handle);
+
+ if (ACPI_SUCCESS(status)) {
+ status = acpi_install_notify_handler(handle,
+ ACPI_SYSTEM_NOTIFY,
+ eeepc_rfkill_notify,
+ NULL);
+ if (ACPI_FAILURE(status))
+ printk(EEEPC_WARNING
+ "Failed to register notify on %s\n", node);
+ } else
+ return -ENODEV;
+
+ return 0;
+}
+
+static void eeepc_unregister_rfkill_notifier(char *node)
+{
+ acpi_status status = AE_OK;
+ acpi_handle handle;
+
+ status = acpi_get_handle(NULL, node, &handle);
+
+ if (ACPI_SUCCESS(status)) {
+ status = acpi_remove_notify_handler(handle,
+ ACPI_SYSTEM_NOTIFY,
+ eeepc_rfkill_notify);
+ if (ACPI_FAILURE(status))
+ printk(EEEPC_ERR
+ "Error removing rfkill notify handler %s\n",
+ node);
+ }
+}
+
static int eeepc_hotk_add(struct acpi_device *device)
{
acpi_status status = AE_OK;
@@ -622,6 +697,10 @@ static int eeepc_hotk_add(struct acpi_device *device)
if (result)
goto bluetooth_fail;
}
+
+ eeepc_register_rfkill_notifier("\\_SB.PCI0.P0P6");
+ eeepc_register_rfkill_notifier("\\_SB.PCI0.P0P7");
+
return 0;
bluetooth_fail:
@@ -649,6 +728,10 @@ static int eeepc_hotk_remove(struct acpi_device *device, int type)
eeepc_hotk_notify);
if (ACPI_FAILURE(status))
printk(EEEPC_ERR "Error removing notify handler\n");
+
+ eeepc_unregister_rfkill_notifier("\\_SB.PCI0.P0P6");
+ eeepc_unregister_rfkill_notifier("\\_SB.PCI0.P0P7");
+
kfree(ehotk);
return 0;
}