ACPI: bay: new driver adding removable drive bay support
Signed-off-by: Kristen Carlson Accardi <kristen.c.accardi@intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Kristen Carlson Accardi
Len Brown
Родитель
fe9a2f77e5
Коммит
01b57e7372
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@ -139,6 +139,13 @@ config ACPI_DOCK
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help
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This driver adds support for ACPI controlled docking stations
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config ACPI_BAY
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tristate "Removable Drive Bay"
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depends on EXPERIMENTAL
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help
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This driver adds support for ACPI controlled removable drive
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bays such as the IBM ultrabay or the Dell Module Bay.
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config ACPI_PROCESSOR
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tristate "Processor"
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default y
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@ -43,6 +43,7 @@ obj-$(CONFIG_ACPI_BUTTON) += button.o
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obj-$(CONFIG_ACPI_EC) += ec.o
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obj-$(CONFIG_ACPI_FAN) += fan.o
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obj-$(CONFIG_ACPI_DOCK) += dock.o
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obj-$(CONFIG_ACPI_BAY) += bay.o
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obj-$(CONFIG_ACPI_VIDEO) += video.o
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obj-$(CONFIG_ACPI_HOTKEY) += hotkey.o
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obj-y += pci_root.o pci_link.o pci_irq.o pci_bind.o
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@ -0,0 +1,592 @@
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/*
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* bay.c - ACPI removable drive bay driver
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*
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* Copyright (C) 2006 Kristen Carlson Accardi <kristen.c.accardi@intel.com>
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/notifier.h>
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#include <acpi/acpi_bus.h>
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#include <acpi/acpi_drivers.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <asm/uaccess.h>
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#define ACPI_BAY_DRIVER_NAME "ACPI Removable Drive Bay Driver"
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ACPI_MODULE_NAME("bay")
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MODULE_AUTHOR("Kristen Carlson Accardi");
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MODULE_DESCRIPTION(ACPI_BAY_DRIVER_NAME);
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MODULE_LICENSE("GPL");
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#define ACPI_BAY_CLASS "bay"
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#define ACPI_BAY_COMPONENT 0x10000000
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#define _COMPONENT ACPI_BAY_COMPONENT
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#define bay_dprintk(h,s) {\
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char prefix[80] = {'\0'};\
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struct acpi_buffer buffer = {sizeof(prefix), prefix};\
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acpi_get_name(h, ACPI_FULL_PATHNAME, &buffer);\
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printk(KERN_DEBUG PREFIX "%s: %s\n", prefix, s); }
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static void bay_notify(acpi_handle handle, u32 event, void *data);
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static int acpi_bay_add(struct acpi_device *device);
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static int acpi_bay_remove(struct acpi_device *device, int type);
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static int acpi_bay_match(struct acpi_device *device,
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struct acpi_driver *driver);
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static struct acpi_driver acpi_bay_driver = {
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.name = ACPI_BAY_DRIVER_NAME,
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.class = ACPI_BAY_CLASS,
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.ops = {
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.add = acpi_bay_add,
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.remove = acpi_bay_remove,
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.match = acpi_bay_match,
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},
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};
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struct bay {
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acpi_handle handle;
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char *name;
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struct list_head list;
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struct proc_dir_entry *proc;
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};
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LIST_HEAD(drive_bays);
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static struct proc_dir_entry *acpi_bay_dir;
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/*****************************************************************************
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* Drive Bay functions *
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*****************************************************************************/
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/**
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* is_ejectable - see if a device is ejectable
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* @handle: acpi handle of the device
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*
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* If an acpi object has a _EJ0 method, then it is ejectable
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*/
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static int is_ejectable(acpi_handle handle)
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{
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acpi_status status;
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acpi_handle tmp;
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status = acpi_get_handle(handle, "_EJ0", &tmp);
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if (ACPI_FAILURE(status))
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return 0;
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return 1;
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}
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/**
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* bay_present - see if the bay device is present
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* @bay: the drive bay
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*
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* execute the _STA method.
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*/
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static int bay_present(struct bay *bay)
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{
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unsigned long sta;
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acpi_status status;
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if (bay) {
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status = acpi_evaluate_integer(bay->handle, "_STA", NULL, &sta);
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if (ACPI_SUCCESS(status) && sta)
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return 1;
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}
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return 0;
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}
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/**
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* eject_device - respond to an eject request
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* @handle - the device to eject
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*
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* Call this devices _EJ0 method.
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*/
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static void eject_device(acpi_handle handle)
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{
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struct acpi_object_list arg_list;
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union acpi_object arg;
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bay_dprintk(handle, "Ejecting device");
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arg_list.count = 1;
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arg_list.pointer = &arg;
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arg.type = ACPI_TYPE_INTEGER;
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arg.integer.value = 1;
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if (ACPI_FAILURE(acpi_evaluate_object(handle, "_EJ0",
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&arg_list, NULL)))
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pr_debug("Failed to evaluate _EJ0!\n");
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}
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/**
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* is_ata - see if a device is an ata device
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* @handle: acpi handle of the device
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*
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* If an acpi object has one of 4 ATA ACPI methods defined,
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* then it is an ATA device
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*/
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static int is_ata(acpi_handle handle)
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{
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acpi_handle tmp;
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if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
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(ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
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(ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
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(ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
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return 1;
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return 0;
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}
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/**
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* parent_is_ata(acpi_handle handle)
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*
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*/
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static int parent_is_ata(acpi_handle handle)
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{
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acpi_handle phandle;
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if (acpi_get_parent(handle, &phandle))
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return 0;
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return is_ata(phandle);
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}
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/**
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* is_ejectable_bay - see if a device is an ejectable drive bay
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* @handle: acpi handle of the device
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*
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* If an acpi object is ejectable and has one of the ACPI ATA
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* methods defined, then we can safely call it an ejectable
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* drive bay
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*/
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static int is_ejectable_bay(acpi_handle handle)
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{
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if ((is_ata(handle) || parent_is_ata(handle)) && is_ejectable(handle))
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return 1;
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return 0;
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}
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/**
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* eject_removable_drive - try to eject this drive
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* @dev : the device structure of the drive
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*
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* If a device is a removable drive that requires an _EJ0 method
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* to be executed in order to safely remove from the system, do
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* it. ATM - always returns success
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*/
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int eject_removable_drive(struct device *dev)
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{
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acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
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if (handle) {
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bay_dprintk(handle, "Got device handle");
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if (is_ejectable_bay(handle))
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eject_device(handle);
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} else {
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printk("No acpi handle for device\n");
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}
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/* should I return an error code? */
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return 0;
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}
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EXPORT_SYMBOL_GPL(eject_removable_drive);
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static int acpi_bay_add(struct acpi_device *device)
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{
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bay_dprintk(device->handle, "adding bay device");
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strcpy(acpi_device_name(device), "Dockable Bay");
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strcpy(acpi_device_class(device), "bay");
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return 0;
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}
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static int acpi_bay_status_seq_show(struct seq_file *seq, void *offset)
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{
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struct bay *bay = (struct bay *)seq->private;
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if (!bay)
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return 0;
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if (bay_present(bay))
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seq_printf(seq, "present\n");
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else
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seq_printf(seq, "removed\n");
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return 0;
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}
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static ssize_t
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acpi_bay_write_eject(struct file *file,
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const char __user * buffer,
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size_t count, loff_t * data)
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{
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struct seq_file *m = (struct seq_file *)file->private_data;
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struct bay *bay = (struct bay *)m->private;
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char str[12] = { 0 };
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u32 state = 0;
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/* FIXME - our only valid value here is 1 */
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if (!bay || count + 1 > sizeof str)
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return -EINVAL;
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if (copy_from_user(str, buffer, count))
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return -EFAULT;
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str[count] = 0;
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state = simple_strtoul(str, NULL, 0);
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if (state)
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eject_device(bay->handle);
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return count;
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}
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static int
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acpi_bay_status_open_fs(struct inode *inode, struct file *file)
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{
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return single_open(file, acpi_bay_status_seq_show,
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PDE(inode)->data);
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}
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static int
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acpi_bay_eject_open_fs(struct inode *inode, struct file *file)
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{
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return single_open(file, acpi_bay_status_seq_show,
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PDE(inode)->data);
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}
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static struct file_operations acpi_bay_status_fops = {
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.open = acpi_bay_status_open_fs,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static struct file_operations acpi_bay_eject_fops = {
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.open = acpi_bay_eject_open_fs,
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.read = seq_read,
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.write = acpi_bay_write_eject,
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.llseek = seq_lseek,
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.release = single_release,
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};
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#if 0
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static struct file_operations acpi_bay_insert_fops = {
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.open = acpi_bay_insert_open_fs,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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#endif
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static int acpi_bay_add_fs(struct bay *bay)
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{
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struct proc_dir_entry *entry = NULL;
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if (!bay)
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return -EINVAL;
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/*
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* create a proc entry for this device
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* we need to do this a little bit differently than normal
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* acpi device drivers because our device may not be present
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* at the moment, and therefore we have no acpi_device struct
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*/
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bay->proc = proc_mkdir(bay->name, acpi_bay_dir);
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/* 'status' [R] */
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entry = create_proc_entry("status",
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S_IRUGO, bay->proc);
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if (!entry)
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return -EIO;
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else {
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entry->proc_fops = &acpi_bay_status_fops;
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entry->data = bay;
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entry->owner = THIS_MODULE;
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}
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/* 'eject' [W] */
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entry = create_proc_entry("eject",
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S_IWUGO, bay->proc);
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if (!entry)
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return -EIO;
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else {
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entry->proc_fops = &acpi_bay_eject_fops;
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entry->data = bay;
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entry->owner = THIS_MODULE;
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}
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#if 0
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/* 'insert' [W] */
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entry = create_proc_entry("insert",
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S_IWUGO, bay->proc);
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if (!entry)
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return -EIO;
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else {
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entry->proc_fops = &acpi_bay_insert_fops;
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entry->data = bay;
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entry->owner = THIS_MODULE;
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}
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#endif
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return 0;
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}
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static void acpi_bay_remove_fs(struct bay *bay)
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{
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if (!bay)
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return;
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if (bay->proc) {
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remove_proc_entry("status", bay->proc);
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remove_proc_entry("eject", bay->proc);
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#if 0
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remove_proc_entry("insert", bay->proc);
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#endif
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remove_proc_entry(bay->name, acpi_bay_dir);
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bay->proc = NULL;
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}
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}
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static int bay_is_dock_device(acpi_handle handle)
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{
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acpi_handle parent;
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acpi_get_parent(handle, &parent);
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/* if the device or it's parent is dependent on the
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* dock, then we are a dock device
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*/
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return (is_dock_device(handle) || is_dock_device(parent));
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}
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static int bay_add(acpi_handle handle)
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{
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acpi_status status;
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struct bay *new_bay;
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struct acpi_buffer nbuffer = {ACPI_ALLOCATE_BUFFER, NULL};
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acpi_get_name(handle, ACPI_FULL_PATHNAME, &nbuffer);
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bay_dprintk(handle, "Adding notify handler");
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/*
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* if this is the first bay device found, make the root
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* proc entry
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*/
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if (acpi_bay_dir == NULL)
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acpi_bay_dir = proc_mkdir(ACPI_BAY_CLASS, acpi_root_dir);
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/*
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* Initialize bay device structure
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*/
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new_bay = kmalloc(GFP_ATOMIC, sizeof(*new_bay));
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INIT_LIST_HEAD(&new_bay->list);
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new_bay->handle = handle;
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new_bay->name = (char *)nbuffer.pointer;
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list_add(&new_bay->list, &drive_bays);
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acpi_bay_add_fs(new_bay);
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/* register for events on this device */
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status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
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bay_notify, new_bay);
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if (ACPI_FAILURE(status)) {
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printk(KERN_ERR PREFIX "Error installing bay notify handler\n");
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}
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/* if we are on a dock station, we should register for dock
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* notifications.
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*/
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if (bay_is_dock_device(handle)) {
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bay_dprintk(handle, "Is dependent on dock\n");
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register_hotplug_dock_device(handle, bay_notify, new_bay);
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}
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printk(KERN_INFO PREFIX "Bay [%s] Added\n", new_bay->name);
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return 0;
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}
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static int acpi_bay_remove(struct acpi_device *device, int type)
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{
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/*** FIXME: do something here */
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return 0;
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}
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static int acpi_bay_match(struct acpi_device *device,
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struct acpi_driver *driver)
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{
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if (!device || !driver)
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return -EINVAL;
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if (is_ejectable_bay(device->handle)) {
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bay_dprintk(device->handle, "matching bay device");
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return 0;
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}
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return -ENODEV;
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}
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/**
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* bay_create_acpi_device - add new devices to acpi
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* @handle - handle of the device to add
|
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*
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* This function will create a new acpi_device for the given
|
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* handle if one does not exist already. This should cause
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* acpi to scan for drivers for the given devices, and call
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* matching driver's add routine.
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*
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* Returns a pointer to the acpi_device corresponding to the handle.
|
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*/
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static struct acpi_device * bay_create_acpi_device(acpi_handle handle)
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{
|
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struct acpi_device *device = NULL;
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struct acpi_device *parent_device;
|
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acpi_handle parent;
|
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int ret;
|
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|
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bay_dprintk(handle, "Trying to get device");
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if (acpi_bus_get_device(handle, &device)) {
|
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/*
|
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* no device created for this object,
|
||||
* so we should create one.
|
||||
*/
|
||||
bay_dprintk(handle, "No device for handle");
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acpi_get_parent(handle, &parent);
|
||||
if (acpi_bus_get_device(parent, &parent_device))
|
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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;
|
||||
struct bay *bay = data;
|
||||
|
||||
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");
|
||||
bay_add(handle);
|
||||
(*count)++;
|
||||
}
|
||||
return AE_OK;
|
||||
}
|
||||
|
||||
static int __init bay_init(void)
|
||||
{
|
||||
int bays = 0;
|
||||
|
||||
acpi_bay_dir = NULL;
|
||||
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 (acpi_bay_dir)
|
||||
remove_proc_entry(ACPI_BAY_CLASS,
|
||||
acpi_root_dir);
|
||||
}
|
||||
}
|
||||
|
||||
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);
|
||||
kfree(bay->name);
|
||||
kfree(bay);
|
||||
}
|
||||
|
||||
if (acpi_bay_dir)
|
||||
remove_proc_entry(ACPI_BAY_CLASS, acpi_root_dir);
|
||||
|
||||
acpi_bus_unregister_driver(&acpi_bay_driver);
|
||||
}
|
||||
|
||||
postcore_initcall(bay_init);
|
||||
module_exit(bay_exit);
|
||||
|
||||
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