dock: add bay and battery hotplug support (db350b08) · Commits · e / devices / android_kernel_fairphone_FP5

drivers/acpi/dock.c

+175 −48

Original line number	Diff line number	Diff line
		@@ -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);
		@@ -535,14 +600,16 @@ 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
		*/
		list_for_each_entry(dock_station, &dock_stations, sibiling) {
		dd = find_dock_dependent_device(dock_station, handle);
		if (dd) {
		dd->handler = handler;
		@@ -550,6 +617,7 @@ register_hotplug_dock_device(acpi_handle handle, acpi_notify_handler handler,
		dock_add_hotplug_device(dock_station, dd);
		return 0;
		}
		}

		return -EINVAL;
		}
		@@ -563,14 +631,17 @@ 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;

		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;
		}
		if (dock_present(ds) \|\| dock_in_progress(ds))
		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.
		*/
		/* 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 @@ find_dock_devices(acpi_handle handle, u32 lvl, void context, void *rv)
		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 @@ static int dock_add(acpi_handle handle)
		/**
		* 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);