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Subject[PATCH v2 03/18] eeepc-wmi: add hotplug code for Eeepc 1000H
Date
Implement wireless like hotplug handling (code stolen from eeepc-laptop).

Reminder: on some models rfkill is implemented 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 platform driver.

Signed-off-by: Corentin Chary <corentincj@iksaif.net>
---
drivers/platform/x86/eeepc-wmi.c | 274 +++++++++++++++++++++++++++++++++++++-
1 files changed, 273 insertions(+), 1 deletions(-)
diff --git a/drivers/platform/x86/eeepc-wmi.c b/drivers/platform/x86/eeepc-wmi.c
index 0d8217d..01bc2b3 100644
--- a/drivers/platform/x86/eeepc-wmi.c
+++ b/drivers/platform/x86/eeepc-wmi.c
@@ -37,9 +37,12 @@
#include <linux/backlight.h>
#include <linux/leds.h>
#include <linux/rfkill.h>
+#include <linux/pci.h>
+#include <linux/pci_hotplug.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/platform_device.h>
+#include <linux/dmi.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>

@@ -72,6 +75,14 @@ MODULE_ALIAS("wmi:"EEEPC_WMI_MGMT_GUID);
#define EEEPC_WMI_DEVID_BLUETOOTH 0x00010013
#define EEEPC_WMI_DEVID_WWAN3G 0x00010019

+static bool hotplug_wireless;
+
+module_param(hotplug_wireless, bool, 0444);
+MODULE_PARM_DESC(hotplug_wireless,
+ "Enable hotplug for wireless device. "
+ "If your laptop needs that, please report to "
+ "acpi4asus-user@lists.sourceforge.net.");
+
static const struct key_entry eeepc_wmi_keymap[] = {
/* Sleep already handled via generic ACPI code */
{ KE_IGNORE, NOTIFY_BRNDOWN_MIN, { KEY_BRIGHTNESSDOWN } },
@@ -109,6 +120,8 @@ struct eeepc_wmi_debug {
};

struct eeepc_wmi {
+ bool hotplug_wireless;
+
struct input_dev *inputdev;
struct backlight_device *backlight_device;
struct platform_device *platform_device;
@@ -122,6 +135,9 @@ struct eeepc_wmi {
struct rfkill *bluetooth_rfkill;
struct rfkill *wwan3g_rfkill;

+ struct hotplug_slot *hotplug_slot;
+ struct mutex hotplug_lock;
+
struct eeepc_wmi_debug debug;
};

@@ -177,7 +193,8 @@ static acpi_status eeepc_wmi_get_devstate(u32 dev_id, u32 *retval)
u32 tmp;

status = wmi_evaluate_method(EEEPC_WMI_MGMT_GUID,
- 1, EEEPC_WMI_METHODID_DSTS, &input, &output);
+ 1, EEEPC_WMI_METHODID_DSTS,
+ &input, &output);

if (ACPI_FAILURE(status))
return status;
@@ -334,6 +351,206 @@ static void eeepc_wmi_led_exit(struct eeepc_wmi *eeepc)
}

/*
+ * PCI hotplug (for wlan rfkill)
+ */
+static bool eeepc_wlan_rfkill_blocked(struct eeepc_wmi *eeepc)
+{
+ u32 retval;
+ acpi_status status;
+
+ status = eeepc_wmi_get_devstate(EEEPC_WMI_DEVID_WLAN, &retval);
+
+ if (ACPI_FAILURE(status))
+ return false;
+
+ return !(retval & 0x1);
+}
+
+static void eeepc_rfkill_hotplug(struct eeepc_wmi *eeepc)
+{
+ struct pci_dev *dev;
+ struct pci_bus *bus;
+ bool blocked = eeepc_wlan_rfkill_blocked(eeepc);
+ bool absent;
+ u32 l;
+
+ if (eeepc->wlan_rfkill)
+ rfkill_set_sw_state(eeepc->wlan_rfkill, blocked);
+
+ mutex_lock(&eeepc->hotplug_lock);
+
+ if (eeepc->hotplug_slot) {
+ bus = pci_find_bus(0, 1);
+ if (!bus) {
+ pr_warning("Unable to find PCI bus 1?\n");
+ goto out_unlock;
+ }
+
+ if (pci_bus_read_config_dword(bus, 0, PCI_VENDOR_ID, &l)) {
+ pr_err("Unable to read PCI config space?\n");
+ goto out_unlock;
+ }
+ absent = (l == 0xffffffff);
+
+ if (blocked != absent) {
+ pr_warning("BIOS says wireless lan is %s, "
+ "but the pci device is %s\n",
+ blocked ? "blocked" : "unblocked",
+ absent ? "absent" : "present");
+ pr_warning("skipped wireless hotplug as probably "
+ "inappropriate for this model\n");
+ goto out_unlock;
+ }
+
+ if (!blocked) {
+ dev = pci_get_slot(bus, 0);
+ if (dev) {
+ /* Device already present */
+ pci_dev_put(dev);
+ goto out_unlock;
+ }
+ dev = pci_scan_single_device(bus, 0);
+ if (dev) {
+ pci_bus_assign_resources(bus);
+ if (pci_bus_add_device(dev))
+ pr_err("Unable to hotplug wifi\n");
+ }
+ } else {
+ dev = pci_get_slot(bus, 0);
+ if (dev) {
+ pci_remove_bus_device(dev);
+ pci_dev_put(dev);
+ }
+ }
+ }
+
+out_unlock:
+ mutex_unlock(&eeepc->hotplug_lock);
+}
+
+static void eeepc_rfkill_notify(acpi_handle handle, u32 event, void *data)
+{
+ struct eeepc_wmi *eeepc = data;
+
+ if (event != ACPI_NOTIFY_BUS_CHECK)
+ return;
+
+ eeepc_rfkill_hotplug(eeepc);
+}
+
+static int eeepc_register_rfkill_notifier(struct eeepc_wmi *eeepc,
+ char *node)
+{
+ acpi_status status;
+ 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,
+ eeepc);
+ if (ACPI_FAILURE(status))
+ pr_warning("Failed to register notify on %s\n", node);
+ } else
+ return -ENODEV;
+
+ return 0;
+}
+
+static void eeepc_unregister_rfkill_notifier(struct eeepc_wmi *eeepc,
+ 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))
+ pr_err("Error removing rfkill notify handler %s\n",
+ node);
+ }
+}
+
+static int eeepc_get_adapter_status(struct hotplug_slot *hotplug_slot,
+ u8 *value)
+{
+ u32 retval;
+ acpi_status status;
+
+ status = eeepc_wmi_get_devstate(EEEPC_WMI_DEVID_WLAN, &retval);
+
+ if (ACPI_FAILURE(status))
+ return -EIO;
+
+ if (!retval || retval == 0x00060000)
+ return -ENODEV;
+ else
+ *value = (retval & 0x1);
+
+ return 0;
+}
+
+static void eeepc_cleanup_pci_hotplug(struct hotplug_slot *hotplug_slot)
+{
+ kfree(hotplug_slot->info);
+ kfree(hotplug_slot);
+}
+
+static struct hotplug_slot_ops eeepc_hotplug_slot_ops = {
+ .owner = THIS_MODULE,
+ .get_adapter_status = eeepc_get_adapter_status,
+ .get_power_status = eeepc_get_adapter_status,
+};
+
+static int eeepc_setup_pci_hotplug(struct eeepc_wmi *eeepc)
+{
+ int ret = -ENOMEM;
+ struct pci_bus *bus = pci_find_bus(0, 1);
+
+ if (!bus) {
+ pr_err("Unable to find wifi PCI bus\n");
+ return -ENODEV;
+ }
+
+ eeepc->hotplug_slot = kzalloc(sizeof(struct hotplug_slot), GFP_KERNEL);
+ if (!eeepc->hotplug_slot)
+ goto error_slot;
+
+ eeepc->hotplug_slot->info = kzalloc(sizeof(struct hotplug_slot_info),
+ GFP_KERNEL);
+ if (!eeepc->hotplug_slot->info)
+ goto error_info;
+
+ eeepc->hotplug_slot->private = eeepc;
+ eeepc->hotplug_slot->release = &eeepc_cleanup_pci_hotplug;
+ eeepc->hotplug_slot->ops = &eeepc_hotplug_slot_ops;
+ eeepc_get_adapter_status(eeepc->hotplug_slot,
+ &eeepc->hotplug_slot->info->adapter_status);
+
+ ret = pci_hp_register(eeepc->hotplug_slot, bus, 0, "eeepc-wifi");
+ if (ret) {
+ pr_err("Unable to register hotplug slot - %d\n", ret);
+ goto error_register;
+ }
+
+ return 0;
+
+error_register:
+ kfree(eeepc->hotplug_slot->info);
+error_info:
+ kfree(eeepc->hotplug_slot);
+ eeepc->hotplug_slot = NULL;
+error_slot:
+ return ret;
+}
+
+/*
* Rfkill devices
*/
static int eeepc_rfkill_set(void *data, bool blocked)
@@ -404,11 +621,22 @@ static int eeepc_new_rfkill(struct eeepc_wmi *eeepc,

static void eeepc_wmi_rfkill_exit(struct eeepc_wmi *eeepc)
{
+ eeepc_unregister_rfkill_notifier(eeepc, "\\_SB.PCI0.P0P5");
+ eeepc_unregister_rfkill_notifier(eeepc, "\\_SB.PCI0.P0P6");
+ eeepc_unregister_rfkill_notifier(eeepc, "\\_SB.PCI0.P0P7");
if (eeepc->wlan_rfkill) {
rfkill_unregister(eeepc->wlan_rfkill);
rfkill_destroy(eeepc->wlan_rfkill);
eeepc->wlan_rfkill = NULL;
}
+ /*
+ * Refresh pci hotplug in case the rfkill state was changed after
+ * eeepc_unregister_rfkill_notifier()
+ */
+ eeepc_rfkill_hotplug(eeepc);
+ if (eeepc->hotplug_slot)
+ pci_hp_deregister(eeepc->hotplug_slot);
+
if (eeepc->bluetooth_rfkill) {
rfkill_unregister(eeepc->bluetooth_rfkill);
rfkill_destroy(eeepc->bluetooth_rfkill);
@@ -425,6 +653,8 @@ static int eeepc_wmi_rfkill_init(struct eeepc_wmi *eeepc)
{
int result = 0;

+ mutex_init(&eeepc->hotplug_lock);
+
result = eeepc_new_rfkill(eeepc, &eeepc->wlan_rfkill,
"eeepc-wlan", RFKILL_TYPE_WLAN,
EEEPC_WMI_DEVID_WLAN);
@@ -446,6 +676,23 @@ static int eeepc_wmi_rfkill_init(struct eeepc_wmi *eeepc)
if (result && result != -ENODEV)
goto exit;

+ result = eeepc_setup_pci_hotplug(eeepc);
+ /*
+ * If we get -EBUSY then something else is handling the PCI hotplug -
+ * don't fail in this case
+ */
+ if (result == -EBUSY)
+ result = 0;
+
+ eeepc_register_rfkill_notifier(eeepc, "\\_SB.PCI0.P0P5");
+ eeepc_register_rfkill_notifier(eeepc, "\\_SB.PCI0.P0P6");
+ eeepc_register_rfkill_notifier(eeepc, "\\_SB.PCI0.P0P7");
+ /*
+ * Refresh pci hotplug in case the rfkill state was changed during
+ * setup.
+ */
+ eeepc_rfkill_hotplug(eeepc);
+
exit:
if (result && result != -ENODEV)
eeepc_wmi_rfkill_exit(eeepc);
@@ -771,6 +1018,28 @@ error_debugfs:
/*
* WMI Driver
*/
+static void eeepc_dmi_check(struct eeepc_wmi *eeepc)
+{
+ const char *model;
+
+ model = dmi_get_system_info(DMI_PRODUCT_NAME);
+ if (!model)
+ return;
+
+ /*
+ * Whitelist for wlan hotplug
+ *
+ * Eeepc 1000H needs the current hotplug code to handle
+ * Fn+F2 correctly. We may add other Eeepc here later, but
+ * it seems that most of the laptops supported by eeepc-wmi
+ * don't need to be on this list
+ */
+ if (strcmp(model, "1000H") == 0) {
+ eeepc->hotplug_wireless = true;
+ pr_info("wlan hotplug enabled\n");
+ }
+}
+
static struct platform_device * __init eeepc_wmi_add(void)
{
struct eeepc_wmi *eeepc;
@@ -781,6 +1050,9 @@ static struct platform_device * __init eeepc_wmi_add(void)
if (!eeepc)
return ERR_PTR(-ENOMEM);

+ eeepc->hotplug_wireless = hotplug_wireless;
+ eeepc_dmi_check(eeepc);
+
/*
* Register the platform device first. It is used as a parent for the
* sub-devices below.
--
1.7.4.rc3


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