dock: add bay and battery hotplug support

Make the dock driver support bay and battery hotplug.
They are all regarded as dock, so handling can be unified.

Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 175 insertions, 48 deletions

diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c
index 7bdf93b74690..799a0fdbb62d 100644
--- a/drivers/acpi/dock.c
+++ b/drivers/acpi/dock.c
@@ -48,7 +48,6 @@ MODULE_PARM_DESC(immediate_undock, "1 (default) will cause the driver to "
         " before undocking");
 
 static struct atomic_notifier_head dock_notifier_list;
-static struct platform_device *dock_device;
 static char dock_device_name[] = "dock";
 
 static const struct acpi_device_id dock_device_ids[] = {
@@ -65,7 +64,12 @@ struct dock_station {
         struct mutex hp_lock;
         struct list_head dependent_devices;
         struct list_head hotplug_devices;
+
+        struct list_head sibiling;
+        struct platform_device *dock_device;
 };
+static LIST_HEAD(dock_stations);
+static int dock_station_count;
 
 struct dock_dependent_device {
         struct list_head list;
@@ -77,11 +81,12 @@ struct dock_dependent_device {
 
 #define DOCK_DOCKING    0x00000001
 #define DOCK_UNDOCKING  0x00000002
+#define DOCK_IS_DOCK    0x00000010
+#define DOCK_IS_ATA     0x00000020
+#define DOCK_IS_BAT     0x00000040
 #define DOCK_EVENT      3
 #define UNDOCK_EVENT    2
 
-static struct dock_station *dock_station;
-
 /*****************************************************************************
  *                         Dock Dependent device functions                   *
  *****************************************************************************/
@@ -199,6 +204,60 @@ static int is_dock(acpi_handle handle)
         return 1;
 }
 
+static int is_ejectable(acpi_handle handle)
+{
+        acpi_status status;
+        acpi_handle tmp;
+
+        status = acpi_get_handle(handle, "_EJ0", &tmp);
+        if (ACPI_FAILURE(status))
+                return 0;
+        return 1;
+}
+
+static int is_ata(acpi_handle handle)
+{
+        acpi_handle tmp;
+
+        if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
+           (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
+           (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
+           (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
+                return 1;
+
+        return 0;
+}
+
+static int is_battery(acpi_handle handle)
+{
+        struct acpi_device_info *info;
+        struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
+        int ret = 1;
+
+        if (!ACPI_SUCCESS(acpi_get_object_info(handle, &buffer)))
+                return 0;
+        info = buffer.pointer;
+        if (!(info->valid & ACPI_VALID_HID))
+                ret = 0;
+        else
+                ret = !strcmp("PNP0C0A", info->hardware_id.value);
+
+        kfree(buffer.pointer);
+        return ret;
+}
+
+static int is_ejectable_bay(acpi_handle handle)
+{
+        acpi_handle phandle;
+        if (!is_ejectable(handle))
+                return 0;
+        if (is_battery(handle) || is_ata(handle))
+                return 1;
+        if (!acpi_get_parent(handle, &phandle) && is_ata(phandle))
+                return 1;
+        return 0;
+}
+
 /**
  * is_dock_device - see if a device is on a dock station
  * @handle: acpi handle of the device
@@ -209,11 +268,17 @@ static int is_dock(acpi_handle handle)
  */
 int is_dock_device(acpi_handle handle)
 {
-        if (!dock_station)
+        struct dock_station *dock_station;
+
+        if (!dock_station_count)
                 return 0;
 
-        if (is_dock(handle) || find_dock_dependent_device(dock_station, handle))
+        if (is_dock(handle))
                 return 1;
+        list_for_each_entry(dock_station, &dock_stations, sibiling) {
+                if (find_dock_dependent_device(dock_station, handle))
+                        return 1;
+        }
 
         return 0;
 }
@@ -341,7 +406,7 @@ static void hotplug_dock_devices(struct dock_station *ds, u32 event)
 
 static void dock_event(struct dock_station *ds, u32 event, int num)
 {
-        struct device *dev = &dock_device->dev;
+        struct device *dev = &ds->dock_device->dev;
         char event_string[13];
         char *envp[] = { event_string, NULL };
 
@@ -414,7 +479,7 @@ static void handle_dock(struct dock_station *ds, int dock)
         arg.type = ACPI_TYPE_INTEGER;
         arg.integer.value = dock;
         status = acpi_evaluate_object(ds->handle, "_DCK", &arg_list, &buffer);
-        if (ACPI_FAILURE(status))
+        if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
                 printk(KERN_ERR PREFIX "%s - failed to execute _DCK\n",
                          (char *)name_buffer.pointer);
         kfree(buffer.pointer);
@@ -498,7 +563,7 @@ static int dock_in_progress(struct dock_station *ds)
  */
 int register_dock_notifier(struct notifier_block *nb)
 {
-        if (!dock_station)
+        if (!dock_station_count)
                 return -ENODEV;
 
         return atomic_notifier_chain_register(&dock_notifier_list, nb);
@@ -512,7 +577,7 @@ EXPORT_SYMBOL_GPL(register_dock_notifier);
  */
 void unregister_dock_notifier(struct notifier_block *nb)
 {
-        if (!dock_station)
+        if (!dock_station_count)
                 return;
 
         atomic_notifier_chain_unregister(&dock_notifier_list, nb);
@@ -535,20 +600,23 @@ register_hotplug_dock_device(acpi_handle handle, acpi_notify_handler handler,
                              void *context)
 {
         struct dock_dependent_device *dd;
+        struct dock_station *dock_station;
 
-        if (!dock_station)
+        if (!dock_station_count)
                 return -ENODEV;
 
         /*
          * make sure this handle is for a device dependent on the dock,
          * this would include the dock station itself
          */
-        dd = find_dock_dependent_device(dock_station, handle);
-        if (dd) {
-                dd->handler = handler;
-                dd->context = context;
-                dock_add_hotplug_device(dock_station, dd);
-                return 0;
+        list_for_each_entry(dock_station, &dock_stations, sibiling) {
+                dd = find_dock_dependent_device(dock_station, handle);
+                if (dd) {
+                        dd->handler = handler;
+                        dd->context = context;
+                        dock_add_hotplug_device(dock_station, dd);
+                        return 0;
+                }
         }
 
         return -EINVAL;
@@ -563,13 +631,16 @@ EXPORT_SYMBOL_GPL(register_hotplug_dock_device);
 void unregister_hotplug_dock_device(acpi_handle handle)
 {
         struct dock_dependent_device *dd;
+        struct dock_station *dock_station;
 
-        if (!dock_station)
+        if (!dock_station_count)
                 return;
 
-        dd = find_dock_dependent_device(dock_station, handle);
-        if (dd)
-                dock_del_hotplug_device(dock_station, dd);
+        list_for_each_entry(dock_station, &dock_stations, sibiling) {
+                dd = find_dock_dependent_device(dock_station, handle);
+                if (dd)
+                        dock_del_hotplug_device(dock_station, dd);
+        }
 }
 
 EXPORT_SYMBOL_GPL(unregister_hotplug_dock_device);
@@ -620,9 +691,28 @@ static void dock_notify(acpi_handle handle, u32 event, void *data)
 {
         struct dock_station *ds = data;
         struct acpi_device *tmp;
+        int surprise_removal = 0;
 
+        /*
+         * According to acpi spec 3.0a, if a DEVICE_CHECK notification
+         * is sent and _DCK is present, it is assumed to mean an undock
+         * request.
+         */
+        if ((ds->flags & DOCK_IS_DOCK) && event == ACPI_NOTIFY_DEVICE_CHECK)
+                event = ACPI_NOTIFY_EJECT_REQUEST;
+
+        /*
+         * dock station: BUS_CHECK - docked or surprise removal
+         *               DEVICE_CHECK - undocked
+         * other device: BUS_CHECK/DEVICE_CHECK - added or surprise removal
+         *
+         * To simplify event handling, dock dependent device handler always
+         * get ACPI_NOTIFY_BUS_CHECK/ACPI_NOTIFY_DEVICE_CHECK for add and
+         * ACPI_NOTIFY_EJECT_REQUEST for removal
+         */
         switch (event) {
         case ACPI_NOTIFY_BUS_CHECK:
+        case ACPI_NOTIFY_DEVICE_CHECK:
                 if (!dock_in_progress(ds) && acpi_bus_get_device(ds->handle,
                    &tmp)) {
                         begin_dock(ds);
@@ -638,20 +728,17 @@ static void dock_notify(acpi_handle handle, u32 event, void *data)
                         complete_dock(ds);
                         dock_event(ds, event, DOCK_EVENT);
                         dock_lock(ds, 1);
+                        break;
                 }
-                break;
-        case ACPI_NOTIFY_DEVICE_CHECK:
-        /*
-         * According to acpi spec 3.0a, if a DEVICE_CHECK notification
-         * is sent and _DCK is present, it is assumed to mean an
-         * undock request.  This notify routine will only be called
-         * for objects defining _DCK, so we will fall through to eject
-         * request here.  However, we will pass an eject request through
-         * to the driver who wish to hotplug.
-         */
+                if (dock_present(ds) || dock_in_progress(ds))
+                        break;
+                /* This is a surprise removal */
+                surprise_removal = 1;
+                event = ACPI_NOTIFY_EJECT_REQUEST;
+                /* Fall back */
         case ACPI_NOTIFY_EJECT_REQUEST:
                 begin_undock(ds);
-                if (immediate_undock)
+                if (immediate_undock || surprise_removal)
                         handle_eject_request(ds, event);
                 else
                         dock_event(ds, event, UNDOCK_EVENT);
@@ -707,6 +794,8 @@ fdd_out:
 static ssize_t show_docked(struct device *dev,
                            struct device_attribute *attr, char *buf)
 {
+        struct dock_station *dock_station = *((struct dock_station **)
+                dev->platform_data);
         return snprintf(buf, PAGE_SIZE, "%d\n", dock_present(dock_station));
 
 }
@@ -718,6 +807,8 @@ static DEVICE_ATTR(docked, S_IRUGO, show_docked, NULL);
 static ssize_t show_flags(struct device *dev,
                           struct device_attribute *attr, char *buf)
 {
+        struct dock_station *dock_station = *((struct dock_station **)
+                dev->platform_data);
         return snprintf(buf, PAGE_SIZE, "%d\n", dock_station->flags);
 
 }
@@ -730,6 +821,8 @@ static ssize_t write_undock(struct device *dev, struct device_attribute *attr,
                            const char *buf, size_t count)
 {
         int ret;
+        struct dock_station *dock_station = *((struct dock_station **)
+                dev->platform_data);
 
         if (!count)
                 return -EINVAL;
@@ -747,6 +840,8 @@ static ssize_t show_dock_uid(struct device *dev,
                              struct device_attribute *attr, char *buf)
 {
         unsigned long lbuf;
+        struct dock_station *dock_station = *((struct dock_station **)
+                dev->platform_data);
         acpi_status status = acpi_evaluate_integer(dock_station->handle,
                                         "_UID", NULL, &lbuf);
         if (ACPI_FAILURE(status))
@@ -768,6 +863,8 @@ static int dock_add(acpi_handle handle)
         int ret;
         acpi_status status;
         struct dock_dependent_device *dd;
+        struct dock_station *dock_station;
+        struct platform_device *dock_device;
 
         /* allocate & initialize the dock_station private data */
         dock_station = kzalloc(sizeof(*dock_station), GFP_KERNEL);
@@ -777,22 +874,34 @@ static int dock_add(acpi_handle handle)
         dock_station->last_dock_time = jiffies - HZ;
         INIT_LIST_HEAD(&dock_station->dependent_devices);
         INIT_LIST_HEAD(&dock_station->hotplug_devices);
+        INIT_LIST_HEAD(&dock_station->sibiling);
         spin_lock_init(&dock_station->dd_lock);
         mutex_init(&dock_station->hp_lock);
         ATOMIC_INIT_NOTIFIER_HEAD(&dock_notifier_list);
 
         /* initialize platform device stuff */
-        dock_device =
-                platform_device_register_simple(dock_device_name, 0, NULL, 0);
+        dock_station->dock_device =
+                platform_device_register_simple(dock_device_name,
+                        dock_station_count, NULL, 0);
+        dock_device = dock_station->dock_device;
         if (IS_ERR(dock_device)) {
                 kfree(dock_station);
                 dock_station = NULL;
                 return PTR_ERR(dock_device);
         }
+        platform_device_add_data(dock_device, &dock_station,
+                sizeof(struct dock_station *));
 
         /* we want the dock device to send uevents */
         dock_device->dev.uevent_suppress = 0;
 
+        if (is_dock(handle))
+                dock_station->flags |= DOCK_IS_DOCK;
+        if (is_ata(handle))
+                dock_station->flags |= DOCK_IS_ATA;
+        if (is_battery(handle))
+                dock_station->flags |= DOCK_IS_BAT;
+
         ret = device_create_file(&dock_device->dev, &dev_attr_docked);
         if (ret) {
                 printk("Error %d adding sysfs file\n", ret);
@@ -858,8 +967,8 @@ static int dock_add(acpi_handle handle)
                 goto dock_add_err;
         }
 
-        printk(KERN_INFO PREFIX "%s\n", ACPI_DOCK_DRIVER_DESCRIPTION);
-
+        dock_station_count++;
+        list_add(&dock_station->sibiling, &dock_stations);
         return 0;
 
 dock_add_err:
@@ -878,12 +987,13 @@ dock_add_err_unregister:
 /**
  * dock_remove - free up resources related to the dock station
  */
-static int dock_remove(void)
+static int dock_remove(struct dock_station *dock_station)
 {
         struct dock_dependent_device *dd, *tmp;
         acpi_status status;
+        struct platform_device *dock_device = dock_station->dock_device;
 
-        if (!dock_station)
+        if (!dock_station_count)
                 return 0;
 
         /* remove dependent devices */
@@ -923,41 +1033,58 @@ static int dock_remove(void)
 static acpi_status
 find_dock(acpi_handle handle, u32 lvl, void *context, void **rv)
 {
-        int *count = context;
         acpi_status status = AE_OK;
 
         if (is_dock(handle)) {
                 if (dock_add(handle) >= 0) {
-                        (*count)++;
                         status = AE_CTRL_TERMINATE;
                 }
         }
         return status;
 }
 
-static int __init dock_init(void)
+static acpi_status
+find_bay(acpi_handle handle, u32 lvl, void *context, void **rv)
 {
-        int num = 0;
-
-        dock_station = NULL;
+        /* If bay is in a dock, it's already handled */
+        if (is_ejectable_bay(handle) && !is_dock_device(handle))
+                dock_add(handle);
+        return AE_OK;
+}
 
+static int __init dock_init(void)
+{
         if (acpi_disabled)
                 return 0;
 
         /* look for a dock station */
         acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
-                            ACPI_UINT32_MAX, find_dock, &num, NULL);
+                            ACPI_UINT32_MAX, find_dock, NULL, NULL);
 
-        if (!num)
-                printk(KERN_INFO "No dock devices found.\n");
+        /* look for bay */
+        acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
+                        ACPI_UINT32_MAX, find_bay, NULL, NULL);
+        if (!dock_station_count) {
+                printk(KERN_INFO PREFIX "No dock devices found.\n");
+                return 0;
+        }
 
+        printk(KERN_INFO PREFIX "%s: %d docks/bays found\n",
+                ACPI_DOCK_DRIVER_DESCRIPTION, dock_station_count);
         return 0;
 }
 
 static void __exit dock_exit(void)
 {
-        dock_remove();
+        struct dock_station *dock_station;
+
+        list_for_each_entry(dock_station, &dock_stations, sibiling)
+                dock_remove(dock_station);
 }
 
-postcore_initcall(dock_init);
+/*
+ * Must be called before drivers of devices in dock, otherwise we can't know
+ * which devices are in a dock
+ */
+subsys_initcall(dock_init);
 module_exit(dock_exit);