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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>
This commit is contained in:
Shaohua Li 2008-08-28 10:03:58 +08:00 committed by Len Brown
parent 406f692d08
commit db350b084d
1 changed files with 175 additions and 48 deletions
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205
drivers/acpi/dock.c
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@ -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;
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 acpi_status
find_bay(acpi_handle handle, u32 lvl, void *context, void **rv)
{
/* 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)
{
int num = 0;
dock_station = NULL;
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);