linux/drivers/acpi/bay.c
Len Brown c2b6705b75 ACPI: fix acpi_driver.name usage
It was erroneously used as a description rather than a name.

ie. turn this:

lenb@se7525gp2:/sys> ls bus/acpi/drivers
ACPI AC Adapter Driver  ACPI Embedded Controller Driver  ACPI Power Resource Driver
ACPI Battery Driver     ACPI Fan Driver                  ACPI Processor Driver
ACPI Button Driver      ACPI PCI Interrupt Link Driver   ACPI Thermal Zone Driver
ACPI container driver   ACPI PCI Root Bridge Driver      hpet

into this:

lenb@se7525gp2:~> ls /sys/bus/acpi/drivers
ac  battery  button  container  ec  fan  hpet  pci_link  pci_root  power  processor  thermal

Signed-off-by: Len Brown <len.brown@intel.com>
2007-02-12 23:33:40 -05:00

491 lines
12 KiB
C

/*
* bay.c - ACPI removable drive bay driver
*
* Copyright (C) 2006 Kristen Carlson Accardi <kristen.c.accardi@intel.com>
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/notifier.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
#include <linux/seq_file.h>
#include <asm/uaccess.h>
#include <linux/platform_device.h>
#define ACPI_BAY_DRIVER_NAME "ACPI Removable Drive Bay Driver"
ACPI_MODULE_NAME("bay");
MODULE_AUTHOR("Kristen Carlson Accardi");
MODULE_DESCRIPTION(ACPI_BAY_DRIVER_NAME);
MODULE_LICENSE("GPL");
#define ACPI_BAY_CLASS "bay"
#define ACPI_BAY_COMPONENT 0x10000000
#define _COMPONENT ACPI_BAY_COMPONENT
#define bay_dprintk(h,s) {\
char prefix[80] = {'\0'};\
struct acpi_buffer buffer = {sizeof(prefix), prefix};\
acpi_get_name(h, ACPI_FULL_PATHNAME, &buffer);\
printk(KERN_DEBUG PREFIX "%s: %s\n", prefix, s); }
static void bay_notify(acpi_handle handle, u32 event, void *data);
static int acpi_bay_add(struct acpi_device *device);
static int acpi_bay_remove(struct acpi_device *device, int type);
static struct acpi_driver acpi_bay_driver = {
.name = "bay",
.class = ACPI_BAY_CLASS,
.ids = ACPI_BAY_HID,
.ops = {
.add = acpi_bay_add,
.remove = acpi_bay_remove,
},
};
struct bay {
acpi_handle handle;
char *name;
struct list_head list;
struct platform_device *pdev;
};
static LIST_HEAD(drive_bays);
/*****************************************************************************
* Drive Bay functions *
*****************************************************************************/
/**
* is_ejectable - see if a device is ejectable
* @handle: acpi handle of the device
*
* If an acpi object has a _EJ0 method, then it is ejectable
*/
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;
}
/**
* bay_present - see if the bay device is present
* @bay: the drive bay
*
* execute the _STA method.
*/
static int bay_present(struct bay *bay)
{
unsigned long sta;
acpi_status status;
if (bay) {
status = acpi_evaluate_integer(bay->handle, "_STA", NULL, &sta);
if (ACPI_SUCCESS(status) && sta)
return 1;
}
return 0;
}
/**
* eject_device - respond to an eject request
* @handle - the device to eject
*
* Call this devices _EJ0 method.
*/
static void eject_device(acpi_handle handle)
{
struct acpi_object_list arg_list;
union acpi_object arg;
bay_dprintk(handle, "Ejecting device");
arg_list.count = 1;
arg_list.pointer = &arg;
arg.type = ACPI_TYPE_INTEGER;
arg.integer.value = 1;
if (ACPI_FAILURE(acpi_evaluate_object(handle, "_EJ0",
&arg_list, NULL)))
pr_debug("Failed to evaluate _EJ0!\n");
}
/*
* show_present - read method for "present" file in sysfs
*/
static ssize_t show_present(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct bay *bay = dev_get_drvdata(dev);
return snprintf(buf, PAGE_SIZE, "%d\n", bay_present(bay));
}
DEVICE_ATTR(present, S_IRUGO, show_present, NULL);
/*
* write_eject - write method for "eject" file in sysfs
*/
static ssize_t write_eject(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct bay *bay = dev_get_drvdata(dev);
if (!count)
return -EINVAL;
eject_device(bay->handle);
return count;
}
DEVICE_ATTR(eject, S_IWUSR, NULL, write_eject);
/**
* is_ata - see if a device is an ata device
* @handle: acpi handle of the device
*
* If an acpi object has one of 4 ATA ACPI methods defined,
* then it is an ATA device
*/
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;
}
/**
* parent_is_ata(acpi_handle handle)
*
*/
static int parent_is_ata(acpi_handle handle)
{
acpi_handle phandle;
if (acpi_get_parent(handle, &phandle))
return 0;
return is_ata(phandle);
}
/**
* is_ejectable_bay - see if a device is an ejectable drive bay
* @handle: acpi handle of the device
*
* If an acpi object is ejectable and has one of the ACPI ATA
* methods defined, then we can safely call it an ejectable
* drive bay
*/
static int is_ejectable_bay(acpi_handle handle)
{
if ((is_ata(handle) || parent_is_ata(handle)) && is_ejectable(handle))
return 1;
return 0;
}
/**
* eject_removable_drive - try to eject this drive
* @dev : the device structure of the drive
*
* If a device is a removable drive that requires an _EJ0 method
* to be executed in order to safely remove from the system, do
* it. ATM - always returns success
*/
int eject_removable_drive(struct device *dev)
{
acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
if (handle) {
bay_dprintk(handle, "Got device handle");
if (is_ejectable_bay(handle))
eject_device(handle);
} else {
printk("No acpi handle for device\n");
}
/* should I return an error code? */
return 0;
}
EXPORT_SYMBOL_GPL(eject_removable_drive);
static int acpi_bay_add(struct acpi_device *device)
{
bay_dprintk(device->handle, "adding bay device");
strcpy(acpi_device_name(device), "Dockable Bay");
strcpy(acpi_device_class(device), "bay");
return 0;
}
static int acpi_bay_add_fs(struct bay *bay)
{
int ret;
struct device *dev = &bay->pdev->dev;
ret = device_create_file(dev, &dev_attr_present);
if (ret)
goto add_fs_err;
ret = device_create_file(dev, &dev_attr_eject);
if (ret) {
device_remove_file(dev, &dev_attr_present);
goto add_fs_err;
}
return 0;
add_fs_err:
bay_dprintk(bay->handle, "Error adding sysfs files\n");
return ret;
}
static void acpi_bay_remove_fs(struct bay *bay)
{
struct device *dev = &bay->pdev->dev;
/* cleanup sysfs */
device_remove_file(dev, &dev_attr_present);
device_remove_file(dev, &dev_attr_eject);
}
static int bay_is_dock_device(acpi_handle handle)
{
acpi_handle parent;
acpi_get_parent(handle, &parent);
/* if the device or it's parent is dependent on the
* dock, then we are a dock device
*/
return (is_dock_device(handle) || is_dock_device(parent));
}
static int bay_add(acpi_handle handle, int id)
{
acpi_status status;
struct bay *new_bay;
struct platform_device *pdev;
struct acpi_buffer nbuffer = {ACPI_ALLOCATE_BUFFER, NULL};
acpi_get_name(handle, ACPI_FULL_PATHNAME, &nbuffer);
bay_dprintk(handle, "Adding notify handler");
/*
* Initialize bay device structure
*/
new_bay = kzalloc(sizeof(*new_bay), GFP_ATOMIC);
INIT_LIST_HEAD(&new_bay->list);
new_bay->handle = handle;
new_bay->name = (char *)nbuffer.pointer;
/* initialize platform device stuff */
pdev = platform_device_register_simple(ACPI_BAY_CLASS, id, NULL, 0);
if (pdev == NULL) {
printk(KERN_ERR PREFIX "Error registering bay device\n");
goto bay_add_err;
}
new_bay->pdev = pdev;
platform_set_drvdata(pdev, new_bay);
if (acpi_bay_add_fs(new_bay)) {
platform_device_unregister(new_bay->pdev);
goto bay_add_err;
}
/* register for events on this device */
status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
bay_notify, new_bay);
if (ACPI_FAILURE(status)) {
printk(KERN_ERR PREFIX "Error installing bay notify handler\n");
}
/* if we are on a dock station, we should register for dock
* notifications.
*/
if (bay_is_dock_device(handle)) {
bay_dprintk(handle, "Is dependent on dock\n");
register_hotplug_dock_device(handle, bay_notify, new_bay);
}
list_add(&new_bay->list, &drive_bays);
printk(KERN_INFO PREFIX "Bay [%s] Added\n", new_bay->name);
return 0;
bay_add_err:
kfree(new_bay->name);
kfree(new_bay);
return -ENODEV;
}
static int acpi_bay_remove(struct acpi_device *device, int type)
{
/*** FIXME: do something here */
return 0;
}
/**
* bay_create_acpi_device - add new devices to acpi
* @handle - handle of the device to add
*
* This function will create a new acpi_device for the given
* handle if one does not exist already. This should cause
* acpi to scan for drivers for the given devices, and call
* matching driver's add routine.
*
* Returns a pointer to the acpi_device corresponding to the handle.
*/
static struct acpi_device * bay_create_acpi_device(acpi_handle handle)
{
struct acpi_device *device = NULL;
struct acpi_device *parent_device;
acpi_handle parent;
int ret;
bay_dprintk(handle, "Trying to get device");
if (acpi_bus_get_device(handle, &device)) {
/*
* no device created for this object,
* so we should create one.
*/
bay_dprintk(handle, "No device for handle");
acpi_get_parent(handle, &parent);
if (acpi_bus_get_device(parent, &parent_device))
parent_device = NULL;
ret = acpi_bus_add(&device, parent_device, handle,
ACPI_BUS_TYPE_DEVICE);
if (ret) {
pr_debug("error adding bus, %x\n",
-ret);
return NULL;
}
}
return device;
}
/**
* bay_notify - act upon an acpi bay notification
* @handle: the bay handle
* @event: the acpi event
* @data: our driver data struct
*
*/
static void bay_notify(acpi_handle handle, u32 event, void *data)
{
struct acpi_device *dev;
bay_dprintk(handle, "Bay event");
switch(event) {
case ACPI_NOTIFY_BUS_CHECK:
printk("Bus Check\n");
case ACPI_NOTIFY_DEVICE_CHECK:
printk("Device Check\n");
dev = bay_create_acpi_device(handle);
if (dev)
acpi_bus_generate_event(dev, event, 0);
else
printk("No device for generating event\n");
/* wouldn't it be a good idea to just rescan SATA
* right here?
*/
break;
case ACPI_NOTIFY_EJECT_REQUEST:
printk("Eject request\n");
dev = bay_create_acpi_device(handle);
if (dev)
acpi_bus_generate_event(dev, event, 0);
else
printk("No device for generating eventn");
/* wouldn't it be a good idea to just call the
* eject_device here if we were a SATA device?
*/
break;
default:
printk("unknown event %d\n", event);
}
}
static acpi_status
find_bay(acpi_handle handle, u32 lvl, void *context, void **rv)
{
int *count = (int *)context;
/*
* there could be more than one ejectable bay.
* so, just return AE_OK always so that every object
* will be checked.
*/
if (is_ejectable_bay(handle)) {
bay_dprintk(handle, "found ejectable bay");
if (!bay_add(handle, *count))
(*count)++;
}
return AE_OK;
}
static int __init bay_init(void)
{
int bays = 0;
INIT_LIST_HEAD(&drive_bays);
/* look for dockable drive bays */
acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
ACPI_UINT32_MAX, find_bay, &bays, NULL);
if (bays)
if ((acpi_bus_register_driver(&acpi_bay_driver) < 0))
printk(KERN_ERR "Unable to register bay driver\n");
if (!bays)
return -ENODEV;
return 0;
}
static void __exit bay_exit(void)
{
struct bay *bay, *tmp;
list_for_each_entry_safe(bay, tmp, &drive_bays, list) {
if (is_dock_device(bay->handle))
unregister_hotplug_dock_device(bay->handle);
acpi_bay_remove_fs(bay);
acpi_remove_notify_handler(bay->handle, ACPI_SYSTEM_NOTIFY,
bay_notify);
platform_device_unregister(bay->pdev);
kfree(bay->name);
kfree(bay);
}
acpi_bus_unregister_driver(&acpi_bay_driver);
}
postcore_initcall(bay_init);
module_exit(bay_exit);