![Tejun Heo](/assets/img/avatar_default.png)
percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
1555 lines
38 KiB
C
1555 lines
38 KiB
C
/*
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* scan.c - support for transforming the ACPI namespace into individual objects
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/kernel.h>
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#include <linux/acpi.h>
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#include <linux/signal.h>
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#include <linux/kthread.h>
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#include <linux/dmi.h>
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#include <acpi/acpi_drivers.h>
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#include "internal.h"
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#define _COMPONENT ACPI_BUS_COMPONENT
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ACPI_MODULE_NAME("scan");
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#define STRUCT_TO_INT(s) (*((int*)&s))
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extern struct acpi_device *acpi_root;
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#define ACPI_BUS_CLASS "system_bus"
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#define ACPI_BUS_HID "LNXSYBUS"
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#define ACPI_BUS_DEVICE_NAME "System Bus"
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#define ACPI_IS_ROOT_DEVICE(device) (!(device)->parent)
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static LIST_HEAD(acpi_device_list);
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static LIST_HEAD(acpi_bus_id_list);
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DEFINE_MUTEX(acpi_device_lock);
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LIST_HEAD(acpi_wakeup_device_list);
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struct acpi_device_bus_id{
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char bus_id[15];
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unsigned int instance_no;
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struct list_head node;
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};
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/*
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* Creates hid/cid(s) string needed for modalias and uevent
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* e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
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* char *modalias: "acpi:IBM0001:ACPI0001"
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*/
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static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
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int size)
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{
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int len;
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int count;
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struct acpi_hardware_id *id;
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len = snprintf(modalias, size, "acpi:");
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size -= len;
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list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
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count = snprintf(&modalias[len], size, "%s:", id->id);
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if (count < 0 || count >= size)
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return -EINVAL;
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len += count;
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size -= count;
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}
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modalias[len] = '\0';
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return len;
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}
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static ssize_t
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acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
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struct acpi_device *acpi_dev = to_acpi_device(dev);
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int len;
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/* Device has no HID and no CID or string is >1024 */
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len = create_modalias(acpi_dev, buf, 1024);
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if (len <= 0)
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return 0;
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buf[len++] = '\n';
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return len;
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}
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static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
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static void acpi_bus_hot_remove_device(void *context)
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{
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struct acpi_device *device;
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acpi_handle handle = context;
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struct acpi_object_list arg_list;
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union acpi_object arg;
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acpi_status status = AE_OK;
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if (acpi_bus_get_device(handle, &device))
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return;
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if (!device)
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return;
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Hot-removing device %s...\n", dev_name(&device->dev)));
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if (acpi_bus_trim(device, 1)) {
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printk(KERN_ERR PREFIX
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"Removing device failed\n");
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return;
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}
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/* power off device */
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status = acpi_evaluate_object(handle, "_PS3", NULL, NULL);
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if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
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printk(KERN_WARNING PREFIX
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"Power-off device failed\n");
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if (device->flags.lockable) {
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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 = 0;
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acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
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}
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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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/*
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* TBD: _EJD support.
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*/
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status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
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if (ACPI_FAILURE(status))
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printk(KERN_WARNING PREFIX
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"Eject device failed\n");
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return;
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}
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static ssize_t
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acpi_eject_store(struct device *d, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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int ret = count;
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acpi_status status;
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acpi_object_type type = 0;
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struct acpi_device *acpi_device = to_acpi_device(d);
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if ((!count) || (buf[0] != '1')) {
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return -EINVAL;
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}
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#ifndef FORCE_EJECT
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if (acpi_device->driver == NULL) {
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ret = -ENODEV;
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goto err;
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}
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#endif
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status = acpi_get_type(acpi_device->handle, &type);
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if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
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ret = -ENODEV;
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goto err;
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}
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acpi_os_hotplug_execute(acpi_bus_hot_remove_device, acpi_device->handle);
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err:
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return ret;
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}
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static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
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static ssize_t
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acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
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struct acpi_device *acpi_dev = to_acpi_device(dev);
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return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
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}
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static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
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static ssize_t
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acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
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struct acpi_device *acpi_dev = to_acpi_device(dev);
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struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
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int result;
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result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
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if (result)
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goto end;
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result = sprintf(buf, "%s\n", (char*)path.pointer);
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kfree(path.pointer);
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end:
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return result;
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}
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static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
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static int acpi_device_setup_files(struct acpi_device *dev)
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{
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acpi_status status;
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acpi_handle temp;
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int result = 0;
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/*
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* Devices gotten from FADT don't have a "path" attribute
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*/
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if (dev->handle) {
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result = device_create_file(&dev->dev, &dev_attr_path);
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if (result)
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goto end;
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}
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result = device_create_file(&dev->dev, &dev_attr_hid);
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if (result)
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goto end;
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result = device_create_file(&dev->dev, &dev_attr_modalias);
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if (result)
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goto end;
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/*
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* If device has _EJ0, 'eject' file is created that is used to trigger
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* hot-removal function from userland.
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*/
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status = acpi_get_handle(dev->handle, "_EJ0", &temp);
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if (ACPI_SUCCESS(status))
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result = device_create_file(&dev->dev, &dev_attr_eject);
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end:
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return result;
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}
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static void acpi_device_remove_files(struct acpi_device *dev)
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{
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acpi_status status;
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acpi_handle temp;
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/*
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* If device has _EJ0, 'eject' file is created that is used to trigger
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* hot-removal function from userland.
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*/
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status = acpi_get_handle(dev->handle, "_EJ0", &temp);
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if (ACPI_SUCCESS(status))
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device_remove_file(&dev->dev, &dev_attr_eject);
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device_remove_file(&dev->dev, &dev_attr_modalias);
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device_remove_file(&dev->dev, &dev_attr_hid);
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if (dev->handle)
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device_remove_file(&dev->dev, &dev_attr_path);
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}
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/* --------------------------------------------------------------------------
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ACPI Bus operations
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-------------------------------------------------------------------------- */
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int acpi_match_device_ids(struct acpi_device *device,
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const struct acpi_device_id *ids)
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{
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const struct acpi_device_id *id;
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struct acpi_hardware_id *hwid;
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/*
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* If the device is not present, it is unnecessary to load device
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* driver for it.
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*/
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if (!device->status.present)
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return -ENODEV;
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for (id = ids; id->id[0]; id++)
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list_for_each_entry(hwid, &device->pnp.ids, list)
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if (!strcmp((char *) id->id, hwid->id))
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return 0;
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return -ENOENT;
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}
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EXPORT_SYMBOL(acpi_match_device_ids);
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static void acpi_free_ids(struct acpi_device *device)
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{
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struct acpi_hardware_id *id, *tmp;
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list_for_each_entry_safe(id, tmp, &device->pnp.ids, list) {
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kfree(id->id);
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kfree(id);
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}
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}
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static void acpi_device_release(struct device *dev)
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{
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struct acpi_device *acpi_dev = to_acpi_device(dev);
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acpi_free_ids(acpi_dev);
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kfree(acpi_dev);
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}
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static int acpi_device_suspend(struct device *dev, pm_message_t state)
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{
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struct acpi_device *acpi_dev = to_acpi_device(dev);
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struct acpi_driver *acpi_drv = acpi_dev->driver;
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if (acpi_drv && acpi_drv->ops.suspend)
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return acpi_drv->ops.suspend(acpi_dev, state);
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return 0;
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}
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static int acpi_device_resume(struct device *dev)
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{
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struct acpi_device *acpi_dev = to_acpi_device(dev);
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struct acpi_driver *acpi_drv = acpi_dev->driver;
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if (acpi_drv && acpi_drv->ops.resume)
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return acpi_drv->ops.resume(acpi_dev);
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return 0;
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}
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static int acpi_bus_match(struct device *dev, struct device_driver *drv)
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{
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struct acpi_device *acpi_dev = to_acpi_device(dev);
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struct acpi_driver *acpi_drv = to_acpi_driver(drv);
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return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
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}
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static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
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{
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struct acpi_device *acpi_dev = to_acpi_device(dev);
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int len;
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if (add_uevent_var(env, "MODALIAS="))
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return -ENOMEM;
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len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
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sizeof(env->buf) - env->buflen);
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if (len >= (sizeof(env->buf) - env->buflen))
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return -ENOMEM;
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env->buflen += len;
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return 0;
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}
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static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
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{
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struct acpi_device *device = data;
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device->driver->ops.notify(device, event);
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}
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static acpi_status acpi_device_notify_fixed(void *data)
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{
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struct acpi_device *device = data;
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/* Fixed hardware devices have no handles */
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acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
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return AE_OK;
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}
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static int acpi_device_install_notify_handler(struct acpi_device *device)
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{
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acpi_status status;
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if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
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status =
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acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
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acpi_device_notify_fixed,
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device);
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else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
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status =
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acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
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acpi_device_notify_fixed,
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device);
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else
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status = acpi_install_notify_handler(device->handle,
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ACPI_DEVICE_NOTIFY,
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acpi_device_notify,
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device);
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if (ACPI_FAILURE(status))
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return -EINVAL;
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return 0;
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}
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static void acpi_device_remove_notify_handler(struct acpi_device *device)
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{
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if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
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acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
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acpi_device_notify_fixed);
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else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
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acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
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acpi_device_notify_fixed);
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else
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acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
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acpi_device_notify);
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}
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static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
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static int acpi_start_single_object(struct acpi_device *);
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static int acpi_device_probe(struct device * dev)
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{
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struct acpi_device *acpi_dev = to_acpi_device(dev);
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struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
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int ret;
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ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
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if (!ret) {
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if (acpi_dev->bus_ops.acpi_op_start)
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acpi_start_single_object(acpi_dev);
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if (acpi_drv->ops.notify) {
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ret = acpi_device_install_notify_handler(acpi_dev);
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if (ret) {
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if (acpi_drv->ops.remove)
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acpi_drv->ops.remove(acpi_dev,
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acpi_dev->removal_type);
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return ret;
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}
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}
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Found driver [%s] for device [%s]\n",
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acpi_drv->name, acpi_dev->pnp.bus_id));
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get_device(dev);
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}
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return ret;
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}
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static int acpi_device_remove(struct device * dev)
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{
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struct acpi_device *acpi_dev = to_acpi_device(dev);
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struct acpi_driver *acpi_drv = acpi_dev->driver;
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if (acpi_drv) {
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if (acpi_drv->ops.notify)
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acpi_device_remove_notify_handler(acpi_dev);
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if (acpi_drv->ops.remove)
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acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
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}
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acpi_dev->driver = NULL;
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acpi_dev->driver_data = NULL;
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put_device(dev);
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return 0;
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}
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struct bus_type acpi_bus_type = {
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.name = "acpi",
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.suspend = acpi_device_suspend,
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.resume = acpi_device_resume,
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.match = acpi_bus_match,
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.probe = acpi_device_probe,
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.remove = acpi_device_remove,
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.uevent = acpi_device_uevent,
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};
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static int acpi_device_register(struct acpi_device *device)
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{
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int result;
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struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
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int found = 0;
|
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|
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/*
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* Linkage
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* -------
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* Link this device to its parent and siblings.
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*/
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INIT_LIST_HEAD(&device->children);
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INIT_LIST_HEAD(&device->node);
|
|
INIT_LIST_HEAD(&device->wakeup_list);
|
|
|
|
new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
|
|
if (!new_bus_id) {
|
|
printk(KERN_ERR PREFIX "Memory allocation error\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
mutex_lock(&acpi_device_lock);
|
|
/*
|
|
* Find suitable bus_id and instance number in acpi_bus_id_list
|
|
* If failed, create one and link it into acpi_bus_id_list
|
|
*/
|
|
list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
|
|
if (!strcmp(acpi_device_bus_id->bus_id,
|
|
acpi_device_hid(device))) {
|
|
acpi_device_bus_id->instance_no++;
|
|
found = 1;
|
|
kfree(new_bus_id);
|
|
break;
|
|
}
|
|
}
|
|
if (!found) {
|
|
acpi_device_bus_id = new_bus_id;
|
|
strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
|
|
acpi_device_bus_id->instance_no = 0;
|
|
list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
|
|
}
|
|
dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
|
|
|
|
if (device->parent)
|
|
list_add_tail(&device->node, &device->parent->children);
|
|
|
|
if (device->wakeup.flags.valid)
|
|
list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
|
|
mutex_unlock(&acpi_device_lock);
|
|
|
|
if (device->parent)
|
|
device->dev.parent = &device->parent->dev;
|
|
device->dev.bus = &acpi_bus_type;
|
|
device->dev.release = &acpi_device_release;
|
|
result = device_register(&device->dev);
|
|
if (result) {
|
|
dev_err(&device->dev, "Error registering device\n");
|
|
goto end;
|
|
}
|
|
|
|
result = acpi_device_setup_files(device);
|
|
if (result)
|
|
printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
|
|
dev_name(&device->dev));
|
|
|
|
device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
|
|
return 0;
|
|
end:
|
|
mutex_lock(&acpi_device_lock);
|
|
if (device->parent)
|
|
list_del(&device->node);
|
|
list_del(&device->wakeup_list);
|
|
mutex_unlock(&acpi_device_lock);
|
|
return result;
|
|
}
|
|
|
|
static void acpi_device_unregister(struct acpi_device *device, int type)
|
|
{
|
|
mutex_lock(&acpi_device_lock);
|
|
if (device->parent)
|
|
list_del(&device->node);
|
|
|
|
list_del(&device->wakeup_list);
|
|
mutex_unlock(&acpi_device_lock);
|
|
|
|
acpi_detach_data(device->handle, acpi_bus_data_handler);
|
|
|
|
acpi_device_remove_files(device);
|
|
device_unregister(&device->dev);
|
|
}
|
|
|
|
/* --------------------------------------------------------------------------
|
|
Driver Management
|
|
-------------------------------------------------------------------------- */
|
|
/**
|
|
* acpi_bus_driver_init - add a device to a driver
|
|
* @device: the device to add and initialize
|
|
* @driver: driver for the device
|
|
*
|
|
* Used to initialize a device via its device driver. Called whenever a
|
|
* driver is bound to a device. Invokes the driver's add() ops.
|
|
*/
|
|
static int
|
|
acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
|
|
{
|
|
int result = 0;
|
|
|
|
if (!device || !driver)
|
|
return -EINVAL;
|
|
|
|
if (!driver->ops.add)
|
|
return -ENOSYS;
|
|
|
|
result = driver->ops.add(device);
|
|
if (result) {
|
|
device->driver = NULL;
|
|
device->driver_data = NULL;
|
|
return result;
|
|
}
|
|
|
|
device->driver = driver;
|
|
|
|
/*
|
|
* TBD - Configuration Management: Assign resources to device based
|
|
* upon possible configuration and currently allocated resources.
|
|
*/
|
|
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
|
|
"Driver successfully bound to device\n"));
|
|
return 0;
|
|
}
|
|
|
|
static int acpi_start_single_object(struct acpi_device *device)
|
|
{
|
|
int result = 0;
|
|
struct acpi_driver *driver;
|
|
|
|
|
|
if (!(driver = device->driver))
|
|
return 0;
|
|
|
|
if (driver->ops.start) {
|
|
result = driver->ops.start(device);
|
|
if (result && driver->ops.remove)
|
|
driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* acpi_bus_register_driver - register a driver with the ACPI bus
|
|
* @driver: driver being registered
|
|
*
|
|
* Registers a driver with the ACPI bus. Searches the namespace for all
|
|
* devices that match the driver's criteria and binds. Returns zero for
|
|
* success or a negative error status for failure.
|
|
*/
|
|
int acpi_bus_register_driver(struct acpi_driver *driver)
|
|
{
|
|
int ret;
|
|
|
|
if (acpi_disabled)
|
|
return -ENODEV;
|
|
driver->drv.name = driver->name;
|
|
driver->drv.bus = &acpi_bus_type;
|
|
driver->drv.owner = driver->owner;
|
|
|
|
ret = driver_register(&driver->drv);
|
|
return ret;
|
|
}
|
|
|
|
EXPORT_SYMBOL(acpi_bus_register_driver);
|
|
|
|
/**
|
|
* acpi_bus_unregister_driver - unregisters a driver with the APIC bus
|
|
* @driver: driver to unregister
|
|
*
|
|
* Unregisters a driver with the ACPI bus. Searches the namespace for all
|
|
* devices that match the driver's criteria and unbinds.
|
|
*/
|
|
void acpi_bus_unregister_driver(struct acpi_driver *driver)
|
|
{
|
|
driver_unregister(&driver->drv);
|
|
}
|
|
|
|
EXPORT_SYMBOL(acpi_bus_unregister_driver);
|
|
|
|
/* --------------------------------------------------------------------------
|
|
Device Enumeration
|
|
-------------------------------------------------------------------------- */
|
|
static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
|
|
{
|
|
acpi_status status;
|
|
int ret;
|
|
struct acpi_device *device;
|
|
|
|
/*
|
|
* Fixed hardware devices do not appear in the namespace and do not
|
|
* have handles, but we fabricate acpi_devices for them, so we have
|
|
* to deal with them specially.
|
|
*/
|
|
if (handle == NULL)
|
|
return acpi_root;
|
|
|
|
do {
|
|
status = acpi_get_parent(handle, &handle);
|
|
if (status == AE_NULL_ENTRY)
|
|
return NULL;
|
|
if (ACPI_FAILURE(status))
|
|
return acpi_root;
|
|
|
|
ret = acpi_bus_get_device(handle, &device);
|
|
if (ret == 0)
|
|
return device;
|
|
} while (1);
|
|
}
|
|
|
|
acpi_status
|
|
acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
|
|
{
|
|
acpi_status status;
|
|
acpi_handle tmp;
|
|
struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
|
|
union acpi_object *obj;
|
|
|
|
status = acpi_get_handle(handle, "_EJD", &tmp);
|
|
if (ACPI_FAILURE(status))
|
|
return status;
|
|
|
|
status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
|
|
if (ACPI_SUCCESS(status)) {
|
|
obj = buffer.pointer;
|
|
status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
|
|
ejd);
|
|
kfree(buffer.pointer);
|
|
}
|
|
return status;
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
|
|
|
|
void acpi_bus_data_handler(acpi_handle handle, void *context)
|
|
{
|
|
|
|
/* TBD */
|
|
|
|
return;
|
|
}
|
|
|
|
static int acpi_bus_get_perf_flags(struct acpi_device *device)
|
|
{
|
|
device->performance.state = ACPI_STATE_UNKNOWN;
|
|
return 0;
|
|
}
|
|
|
|
static acpi_status
|
|
acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
|
|
union acpi_object *package)
|
|
{
|
|
int i = 0;
|
|
union acpi_object *element = NULL;
|
|
|
|
if (!device || !package || (package->package.count < 2))
|
|
return AE_BAD_PARAMETER;
|
|
|
|
element = &(package->package.elements[0]);
|
|
if (!element)
|
|
return AE_BAD_PARAMETER;
|
|
if (element->type == ACPI_TYPE_PACKAGE) {
|
|
if ((element->package.count < 2) ||
|
|
(element->package.elements[0].type !=
|
|
ACPI_TYPE_LOCAL_REFERENCE)
|
|
|| (element->package.elements[1].type != ACPI_TYPE_INTEGER))
|
|
return AE_BAD_DATA;
|
|
device->wakeup.gpe_device =
|
|
element->package.elements[0].reference.handle;
|
|
device->wakeup.gpe_number =
|
|
(u32) element->package.elements[1].integer.value;
|
|
} else if (element->type == ACPI_TYPE_INTEGER) {
|
|
device->wakeup.gpe_number = element->integer.value;
|
|
} else
|
|
return AE_BAD_DATA;
|
|
|
|
element = &(package->package.elements[1]);
|
|
if (element->type != ACPI_TYPE_INTEGER) {
|
|
return AE_BAD_DATA;
|
|
}
|
|
device->wakeup.sleep_state = element->integer.value;
|
|
|
|
if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
|
|
return AE_NO_MEMORY;
|
|
}
|
|
device->wakeup.resources.count = package->package.count - 2;
|
|
for (i = 0; i < device->wakeup.resources.count; i++) {
|
|
element = &(package->package.elements[i + 2]);
|
|
if (element->type != ACPI_TYPE_LOCAL_REFERENCE)
|
|
return AE_BAD_DATA;
|
|
|
|
device->wakeup.resources.handles[i] = element->reference.handle;
|
|
}
|
|
|
|
return AE_OK;
|
|
}
|
|
|
|
static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
|
|
{
|
|
struct acpi_device_id button_device_ids[] = {
|
|
{"PNP0C0D", 0},
|
|
{"PNP0C0C", 0},
|
|
{"PNP0C0E", 0},
|
|
{"", 0},
|
|
};
|
|
acpi_status status;
|
|
acpi_event_status event_status;
|
|
|
|
device->wakeup.run_wake_count = 0;
|
|
device->wakeup.flags.notifier_present = 0;
|
|
|
|
/* Power button, Lid switch always enable wakeup */
|
|
if (!acpi_match_device_ids(device, button_device_ids)) {
|
|
device->wakeup.flags.run_wake = 1;
|
|
device->wakeup.flags.always_enabled = 1;
|
|
return;
|
|
}
|
|
|
|
status = acpi_get_gpe_status(NULL, device->wakeup.gpe_number,
|
|
ACPI_NOT_ISR, &event_status);
|
|
if (status == AE_OK)
|
|
device->wakeup.flags.run_wake =
|
|
!!(event_status & ACPI_EVENT_FLAG_HANDLE);
|
|
}
|
|
|
|
static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
|
|
{
|
|
acpi_status status = 0;
|
|
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
|
|
union acpi_object *package = NULL;
|
|
int psw_error;
|
|
|
|
/* _PRW */
|
|
status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
|
|
if (ACPI_FAILURE(status)) {
|
|
ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
|
|
goto end;
|
|
}
|
|
|
|
package = (union acpi_object *)buffer.pointer;
|
|
status = acpi_bus_extract_wakeup_device_power_package(device, package);
|
|
if (ACPI_FAILURE(status)) {
|
|
ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
|
|
goto end;
|
|
}
|
|
|
|
kfree(buffer.pointer);
|
|
|
|
device->wakeup.flags.valid = 1;
|
|
device->wakeup.prepare_count = 0;
|
|
acpi_bus_set_run_wake_flags(device);
|
|
/* Call _PSW/_DSW object to disable its ability to wake the sleeping
|
|
* system for the ACPI device with the _PRW object.
|
|
* The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
|
|
* So it is necessary to call _DSW object first. Only when it is not
|
|
* present will the _PSW object used.
|
|
*/
|
|
psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
|
|
if (psw_error)
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
|
|
"error in _DSW or _PSW evaluation\n"));
|
|
|
|
end:
|
|
if (ACPI_FAILURE(status))
|
|
device->flags.wake_capable = 0;
|
|
return 0;
|
|
}
|
|
|
|
static int acpi_bus_get_power_flags(struct acpi_device *device)
|
|
{
|
|
acpi_status status = 0;
|
|
acpi_handle handle = NULL;
|
|
u32 i = 0;
|
|
|
|
|
|
/*
|
|
* Power Management Flags
|
|
*/
|
|
status = acpi_get_handle(device->handle, "_PSC", &handle);
|
|
if (ACPI_SUCCESS(status))
|
|
device->power.flags.explicit_get = 1;
|
|
status = acpi_get_handle(device->handle, "_IRC", &handle);
|
|
if (ACPI_SUCCESS(status))
|
|
device->power.flags.inrush_current = 1;
|
|
|
|
/*
|
|
* Enumerate supported power management states
|
|
*/
|
|
for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
|
|
struct acpi_device_power_state *ps = &device->power.states[i];
|
|
char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
|
|
|
|
/* Evaluate "_PRx" to se if power resources are referenced */
|
|
acpi_evaluate_reference(device->handle, object_name, NULL,
|
|
&ps->resources);
|
|
if (ps->resources.count) {
|
|
device->power.flags.power_resources = 1;
|
|
ps->flags.valid = 1;
|
|
}
|
|
|
|
/* Evaluate "_PSx" to see if we can do explicit sets */
|
|
object_name[2] = 'S';
|
|
status = acpi_get_handle(device->handle, object_name, &handle);
|
|
if (ACPI_SUCCESS(status)) {
|
|
ps->flags.explicit_set = 1;
|
|
ps->flags.valid = 1;
|
|
}
|
|
|
|
/* State is valid if we have some power control */
|
|
if (ps->resources.count || ps->flags.explicit_set)
|
|
ps->flags.valid = 1;
|
|
|
|
ps->power = -1; /* Unknown - driver assigned */
|
|
ps->latency = -1; /* Unknown - driver assigned */
|
|
}
|
|
|
|
/* Set defaults for D0 and D3 states (always valid) */
|
|
device->power.states[ACPI_STATE_D0].flags.valid = 1;
|
|
device->power.states[ACPI_STATE_D0].power = 100;
|
|
device->power.states[ACPI_STATE_D3].flags.valid = 1;
|
|
device->power.states[ACPI_STATE_D3].power = 0;
|
|
|
|
/* TBD: System wake support and resource requirements. */
|
|
|
|
device->power.state = ACPI_STATE_UNKNOWN;
|
|
acpi_bus_get_power(device->handle, &(device->power.state));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int acpi_bus_get_flags(struct acpi_device *device)
|
|
{
|
|
acpi_status status = AE_OK;
|
|
acpi_handle temp = NULL;
|
|
|
|
|
|
/* Presence of _STA indicates 'dynamic_status' */
|
|
status = acpi_get_handle(device->handle, "_STA", &temp);
|
|
if (ACPI_SUCCESS(status))
|
|
device->flags.dynamic_status = 1;
|
|
|
|
/* Presence of _RMV indicates 'removable' */
|
|
status = acpi_get_handle(device->handle, "_RMV", &temp);
|
|
if (ACPI_SUCCESS(status))
|
|
device->flags.removable = 1;
|
|
|
|
/* Presence of _EJD|_EJ0 indicates 'ejectable' */
|
|
status = acpi_get_handle(device->handle, "_EJD", &temp);
|
|
if (ACPI_SUCCESS(status))
|
|
device->flags.ejectable = 1;
|
|
else {
|
|
status = acpi_get_handle(device->handle, "_EJ0", &temp);
|
|
if (ACPI_SUCCESS(status))
|
|
device->flags.ejectable = 1;
|
|
}
|
|
|
|
/* Presence of _LCK indicates 'lockable' */
|
|
status = acpi_get_handle(device->handle, "_LCK", &temp);
|
|
if (ACPI_SUCCESS(status))
|
|
device->flags.lockable = 1;
|
|
|
|
/* Presence of _PS0|_PR0 indicates 'power manageable' */
|
|
status = acpi_get_handle(device->handle, "_PS0", &temp);
|
|
if (ACPI_FAILURE(status))
|
|
status = acpi_get_handle(device->handle, "_PR0", &temp);
|
|
if (ACPI_SUCCESS(status))
|
|
device->flags.power_manageable = 1;
|
|
|
|
/* Presence of _PRW indicates wake capable */
|
|
status = acpi_get_handle(device->handle, "_PRW", &temp);
|
|
if (ACPI_SUCCESS(status))
|
|
device->flags.wake_capable = 1;
|
|
|
|
/* TBD: Performance management */
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void acpi_device_get_busid(struct acpi_device *device)
|
|
{
|
|
char bus_id[5] = { '?', 0 };
|
|
struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
|
|
int i = 0;
|
|
|
|
/*
|
|
* Bus ID
|
|
* ------
|
|
* The device's Bus ID is simply the object name.
|
|
* TBD: Shouldn't this value be unique (within the ACPI namespace)?
|
|
*/
|
|
if (ACPI_IS_ROOT_DEVICE(device)) {
|
|
strcpy(device->pnp.bus_id, "ACPI");
|
|
return;
|
|
}
|
|
|
|
switch (device->device_type) {
|
|
case ACPI_BUS_TYPE_POWER_BUTTON:
|
|
strcpy(device->pnp.bus_id, "PWRF");
|
|
break;
|
|
case ACPI_BUS_TYPE_SLEEP_BUTTON:
|
|
strcpy(device->pnp.bus_id, "SLPF");
|
|
break;
|
|
default:
|
|
acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
|
|
/* Clean up trailing underscores (if any) */
|
|
for (i = 3; i > 1; i--) {
|
|
if (bus_id[i] == '_')
|
|
bus_id[i] = '\0';
|
|
else
|
|
break;
|
|
}
|
|
strcpy(device->pnp.bus_id, bus_id);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* acpi_bay_match - see if a device is an ejectable driver bay
|
|
*
|
|
* 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 acpi_bay_match(struct acpi_device *device){
|
|
acpi_status status;
|
|
acpi_handle handle;
|
|
acpi_handle tmp;
|
|
acpi_handle phandle;
|
|
|
|
handle = device->handle;
|
|
|
|
status = acpi_get_handle(handle, "_EJ0", &tmp);
|
|
if (ACPI_FAILURE(status))
|
|
return -ENODEV;
|
|
|
|
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 0;
|
|
|
|
if (acpi_get_parent(handle, &phandle))
|
|
return -ENODEV;
|
|
|
|
if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
|
|
(ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
|
|
(ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
|
|
(ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
|
|
return 0;
|
|
|
|
return -ENODEV;
|
|
}
|
|
|
|
/*
|
|
* acpi_dock_match - see if a device has a _DCK method
|
|
*/
|
|
static int acpi_dock_match(struct acpi_device *device)
|
|
{
|
|
acpi_handle tmp;
|
|
return acpi_get_handle(device->handle, "_DCK", &tmp);
|
|
}
|
|
|
|
char *acpi_device_hid(struct acpi_device *device)
|
|
{
|
|
struct acpi_hardware_id *hid;
|
|
|
|
hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
|
|
return hid->id;
|
|
}
|
|
EXPORT_SYMBOL(acpi_device_hid);
|
|
|
|
static void acpi_add_id(struct acpi_device *device, const char *dev_id)
|
|
{
|
|
struct acpi_hardware_id *id;
|
|
|
|
id = kmalloc(sizeof(*id), GFP_KERNEL);
|
|
if (!id)
|
|
return;
|
|
|
|
id->id = kmalloc(strlen(dev_id) + 1, GFP_KERNEL);
|
|
if (!id->id) {
|
|
kfree(id);
|
|
return;
|
|
}
|
|
|
|
strcpy(id->id, dev_id);
|
|
list_add_tail(&id->list, &device->pnp.ids);
|
|
}
|
|
|
|
/*
|
|
* Old IBM workstations have a DSDT bug wherein the SMBus object
|
|
* lacks the SMBUS01 HID and the methods do not have the necessary "_"
|
|
* prefix. Work around this.
|
|
*/
|
|
static int acpi_ibm_smbus_match(struct acpi_device *device)
|
|
{
|
|
acpi_handle h_dummy;
|
|
struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
|
|
int result;
|
|
|
|
if (!dmi_name_in_vendors("IBM"))
|
|
return -ENODEV;
|
|
|
|
/* Look for SMBS object */
|
|
result = acpi_get_name(device->handle, ACPI_SINGLE_NAME, &path);
|
|
if (result)
|
|
return result;
|
|
|
|
if (strcmp("SMBS", path.pointer)) {
|
|
result = -ENODEV;
|
|
goto out;
|
|
}
|
|
|
|
/* Does it have the necessary (but misnamed) methods? */
|
|
result = -ENODEV;
|
|
if (ACPI_SUCCESS(acpi_get_handle(device->handle, "SBI", &h_dummy)) &&
|
|
ACPI_SUCCESS(acpi_get_handle(device->handle, "SBR", &h_dummy)) &&
|
|
ACPI_SUCCESS(acpi_get_handle(device->handle, "SBW", &h_dummy)))
|
|
result = 0;
|
|
out:
|
|
kfree(path.pointer);
|
|
return result;
|
|
}
|
|
|
|
static void acpi_device_set_id(struct acpi_device *device)
|
|
{
|
|
acpi_status status;
|
|
struct acpi_device_info *info;
|
|
struct acpica_device_id_list *cid_list;
|
|
int i;
|
|
|
|
switch (device->device_type) {
|
|
case ACPI_BUS_TYPE_DEVICE:
|
|
if (ACPI_IS_ROOT_DEVICE(device)) {
|
|
acpi_add_id(device, ACPI_SYSTEM_HID);
|
|
break;
|
|
} else if (ACPI_IS_ROOT_DEVICE(device->parent)) {
|
|
/* \_SB_, the only root-level namespace device */
|
|
acpi_add_id(device, ACPI_BUS_HID);
|
|
strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
|
|
strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
|
|
break;
|
|
}
|
|
|
|
status = acpi_get_object_info(device->handle, &info);
|
|
if (ACPI_FAILURE(status)) {
|
|
printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
|
|
return;
|
|
}
|
|
|
|
if (info->valid & ACPI_VALID_HID)
|
|
acpi_add_id(device, info->hardware_id.string);
|
|
if (info->valid & ACPI_VALID_CID) {
|
|
cid_list = &info->compatible_id_list;
|
|
for (i = 0; i < cid_list->count; i++)
|
|
acpi_add_id(device, cid_list->ids[i].string);
|
|
}
|
|
if (info->valid & ACPI_VALID_ADR) {
|
|
device->pnp.bus_address = info->address;
|
|
device->flags.bus_address = 1;
|
|
}
|
|
|
|
kfree(info);
|
|
|
|
/*
|
|
* Some devices don't reliably have _HIDs & _CIDs, so add
|
|
* synthetic HIDs to make sure drivers can find them.
|
|
*/
|
|
if (acpi_is_video_device(device))
|
|
acpi_add_id(device, ACPI_VIDEO_HID);
|
|
else if (ACPI_SUCCESS(acpi_bay_match(device)))
|
|
acpi_add_id(device, ACPI_BAY_HID);
|
|
else if (ACPI_SUCCESS(acpi_dock_match(device)))
|
|
acpi_add_id(device, ACPI_DOCK_HID);
|
|
else if (!acpi_ibm_smbus_match(device))
|
|
acpi_add_id(device, ACPI_SMBUS_IBM_HID);
|
|
|
|
break;
|
|
case ACPI_BUS_TYPE_POWER:
|
|
acpi_add_id(device, ACPI_POWER_HID);
|
|
break;
|
|
case ACPI_BUS_TYPE_PROCESSOR:
|
|
acpi_add_id(device, ACPI_PROCESSOR_OBJECT_HID);
|
|
break;
|
|
case ACPI_BUS_TYPE_THERMAL:
|
|
acpi_add_id(device, ACPI_THERMAL_HID);
|
|
break;
|
|
case ACPI_BUS_TYPE_POWER_BUTTON:
|
|
acpi_add_id(device, ACPI_BUTTON_HID_POWERF);
|
|
break;
|
|
case ACPI_BUS_TYPE_SLEEP_BUTTON:
|
|
acpi_add_id(device, ACPI_BUTTON_HID_SLEEPF);
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* We build acpi_devices for some objects that don't have _HID or _CID,
|
|
* e.g., PCI bridges and slots. Drivers can't bind to these objects,
|
|
* but we do use them indirectly by traversing the acpi_device tree.
|
|
* This generic ID isn't useful for driver binding, but it provides
|
|
* the useful property that "every acpi_device has an ID."
|
|
*/
|
|
if (list_empty(&device->pnp.ids))
|
|
acpi_add_id(device, "device");
|
|
}
|
|
|
|
static int acpi_device_set_context(struct acpi_device *device)
|
|
{
|
|
acpi_status status;
|
|
|
|
/*
|
|
* Context
|
|
* -------
|
|
* Attach this 'struct acpi_device' to the ACPI object. This makes
|
|
* resolutions from handle->device very efficient. Fixed hardware
|
|
* devices have no handles, so we skip them.
|
|
*/
|
|
if (!device->handle)
|
|
return 0;
|
|
|
|
status = acpi_attach_data(device->handle,
|
|
acpi_bus_data_handler, device);
|
|
if (ACPI_SUCCESS(status))
|
|
return 0;
|
|
|
|
printk(KERN_ERR PREFIX "Error attaching device data\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
|
|
{
|
|
if (!dev)
|
|
return -EINVAL;
|
|
|
|
dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
|
|
device_release_driver(&dev->dev);
|
|
|
|
if (!rmdevice)
|
|
return 0;
|
|
|
|
/*
|
|
* unbind _ADR-Based Devices when hot removal
|
|
*/
|
|
if (dev->flags.bus_address) {
|
|
if ((dev->parent) && (dev->parent->ops.unbind))
|
|
dev->parent->ops.unbind(dev);
|
|
}
|
|
acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int acpi_add_single_object(struct acpi_device **child,
|
|
acpi_handle handle, int type,
|
|
unsigned long long sta,
|
|
struct acpi_bus_ops *ops)
|
|
{
|
|
int result;
|
|
struct acpi_device *device;
|
|
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
|
|
|
|
device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
|
|
if (!device) {
|
|
printk(KERN_ERR PREFIX "Memory allocation error\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
INIT_LIST_HEAD(&device->pnp.ids);
|
|
device->device_type = type;
|
|
device->handle = handle;
|
|
device->parent = acpi_bus_get_parent(handle);
|
|
device->bus_ops = *ops; /* workround for not call .start */
|
|
STRUCT_TO_INT(device->status) = sta;
|
|
|
|
acpi_device_get_busid(device);
|
|
|
|
/*
|
|
* Flags
|
|
* -----
|
|
* Note that we only look for object handles -- cannot evaluate objects
|
|
* until we know the device is present and properly initialized.
|
|
*/
|
|
result = acpi_bus_get_flags(device);
|
|
if (result)
|
|
goto end;
|
|
|
|
/*
|
|
* Initialize Device
|
|
* -----------------
|
|
* TBD: Synch with Core's enumeration/initialization process.
|
|
*/
|
|
acpi_device_set_id(device);
|
|
|
|
/*
|
|
* Power Management
|
|
* ----------------
|
|
*/
|
|
if (device->flags.power_manageable) {
|
|
result = acpi_bus_get_power_flags(device);
|
|
if (result)
|
|
goto end;
|
|
}
|
|
|
|
/*
|
|
* Wakeup device management
|
|
*-----------------------
|
|
*/
|
|
if (device->flags.wake_capable) {
|
|
result = acpi_bus_get_wakeup_device_flags(device);
|
|
if (result)
|
|
goto end;
|
|
}
|
|
|
|
/*
|
|
* Performance Management
|
|
* ----------------------
|
|
*/
|
|
if (device->flags.performance_manageable) {
|
|
result = acpi_bus_get_perf_flags(device);
|
|
if (result)
|
|
goto end;
|
|
}
|
|
|
|
if ((result = acpi_device_set_context(device)))
|
|
goto end;
|
|
|
|
result = acpi_device_register(device);
|
|
|
|
/*
|
|
* Bind _ADR-Based Devices when hot add
|
|
*/
|
|
if (device->flags.bus_address) {
|
|
if (device->parent && device->parent->ops.bind)
|
|
device->parent->ops.bind(device);
|
|
}
|
|
|
|
end:
|
|
if (!result) {
|
|
acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
|
|
"Adding %s [%s] parent %s\n", dev_name(&device->dev),
|
|
(char *) buffer.pointer,
|
|
device->parent ? dev_name(&device->parent->dev) :
|
|
"(null)"));
|
|
kfree(buffer.pointer);
|
|
*child = device;
|
|
} else
|
|
acpi_device_release(&device->dev);
|
|
|
|
return result;
|
|
}
|
|
|
|
#define ACPI_STA_DEFAULT (ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | \
|
|
ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING)
|
|
|
|
static int acpi_bus_type_and_status(acpi_handle handle, int *type,
|
|
unsigned long long *sta)
|
|
{
|
|
acpi_status status;
|
|
acpi_object_type acpi_type;
|
|
|
|
status = acpi_get_type(handle, &acpi_type);
|
|
if (ACPI_FAILURE(status))
|
|
return -ENODEV;
|
|
|
|
switch (acpi_type) {
|
|
case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
|
|
case ACPI_TYPE_DEVICE:
|
|
*type = ACPI_BUS_TYPE_DEVICE;
|
|
status = acpi_bus_get_status_handle(handle, sta);
|
|
if (ACPI_FAILURE(status))
|
|
return -ENODEV;
|
|
break;
|
|
case ACPI_TYPE_PROCESSOR:
|
|
*type = ACPI_BUS_TYPE_PROCESSOR;
|
|
status = acpi_bus_get_status_handle(handle, sta);
|
|
if (ACPI_FAILURE(status))
|
|
return -ENODEV;
|
|
break;
|
|
case ACPI_TYPE_THERMAL:
|
|
*type = ACPI_BUS_TYPE_THERMAL;
|
|
*sta = ACPI_STA_DEFAULT;
|
|
break;
|
|
case ACPI_TYPE_POWER:
|
|
*type = ACPI_BUS_TYPE_POWER;
|
|
*sta = ACPI_STA_DEFAULT;
|
|
break;
|
|
default:
|
|
return -ENODEV;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl,
|
|
void *context, void **return_value)
|
|
{
|
|
struct acpi_bus_ops *ops = context;
|
|
int type;
|
|
unsigned long long sta;
|
|
struct acpi_device *device;
|
|
acpi_status status;
|
|
int result;
|
|
|
|
result = acpi_bus_type_and_status(handle, &type, &sta);
|
|
if (result)
|
|
return AE_OK;
|
|
|
|
if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
|
|
!(sta & ACPI_STA_DEVICE_FUNCTIONING))
|
|
return AE_CTRL_DEPTH;
|
|
|
|
/*
|
|
* We may already have an acpi_device from a previous enumeration. If
|
|
* so, we needn't add it again, but we may still have to start it.
|
|
*/
|
|
device = NULL;
|
|
acpi_bus_get_device(handle, &device);
|
|
if (ops->acpi_op_add && !device)
|
|
acpi_add_single_object(&device, handle, type, sta, ops);
|
|
|
|
if (!device)
|
|
return AE_CTRL_DEPTH;
|
|
|
|
if (ops->acpi_op_start && !(ops->acpi_op_add)) {
|
|
status = acpi_start_single_object(device);
|
|
if (ACPI_FAILURE(status))
|
|
return AE_CTRL_DEPTH;
|
|
}
|
|
|
|
if (!*return_value)
|
|
*return_value = device;
|
|
return AE_OK;
|
|
}
|
|
|
|
static int acpi_bus_scan(acpi_handle handle, struct acpi_bus_ops *ops,
|
|
struct acpi_device **child)
|
|
{
|
|
acpi_status status;
|
|
void *device = NULL;
|
|
|
|
status = acpi_bus_check_add(handle, 0, ops, &device);
|
|
if (ACPI_SUCCESS(status))
|
|
acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
|
|
acpi_bus_check_add, NULL, ops, &device);
|
|
|
|
if (child)
|
|
*child = device;
|
|
|
|
if (device)
|
|
return 0;
|
|
else
|
|
return -ENODEV;
|
|
}
|
|
|
|
/*
|
|
* acpi_bus_add and acpi_bus_start
|
|
*
|
|
* scan a given ACPI tree and (probably recently hot-plugged)
|
|
* create and add or starts found devices.
|
|
*
|
|
* If no devices were found -ENODEV is returned which does not
|
|
* mean that this is a real error, there just have been no suitable
|
|
* ACPI objects in the table trunk from which the kernel could create
|
|
* a device and add/start an appropriate driver.
|
|
*/
|
|
|
|
int
|
|
acpi_bus_add(struct acpi_device **child,
|
|
struct acpi_device *parent, acpi_handle handle, int type)
|
|
{
|
|
struct acpi_bus_ops ops;
|
|
|
|
memset(&ops, 0, sizeof(ops));
|
|
ops.acpi_op_add = 1;
|
|
|
|
return acpi_bus_scan(handle, &ops, child);
|
|
}
|
|
EXPORT_SYMBOL(acpi_bus_add);
|
|
|
|
int acpi_bus_start(struct acpi_device *device)
|
|
{
|
|
struct acpi_bus_ops ops;
|
|
|
|
if (!device)
|
|
return -EINVAL;
|
|
|
|
memset(&ops, 0, sizeof(ops));
|
|
ops.acpi_op_start = 1;
|
|
|
|
return acpi_bus_scan(device->handle, &ops, NULL);
|
|
}
|
|
EXPORT_SYMBOL(acpi_bus_start);
|
|
|
|
int acpi_bus_trim(struct acpi_device *start, int rmdevice)
|
|
{
|
|
acpi_status status;
|
|
struct acpi_device *parent, *child;
|
|
acpi_handle phandle, chandle;
|
|
acpi_object_type type;
|
|
u32 level = 1;
|
|
int err = 0;
|
|
|
|
parent = start;
|
|
phandle = start->handle;
|
|
child = chandle = NULL;
|
|
|
|
while ((level > 0) && parent && (!err)) {
|
|
status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
|
|
chandle, &chandle);
|
|
|
|
/*
|
|
* If this scope is exhausted then move our way back up.
|
|
*/
|
|
if (ACPI_FAILURE(status)) {
|
|
level--;
|
|
chandle = phandle;
|
|
acpi_get_parent(phandle, &phandle);
|
|
child = parent;
|
|
parent = parent->parent;
|
|
|
|
if (level == 0)
|
|
err = acpi_bus_remove(child, rmdevice);
|
|
else
|
|
err = acpi_bus_remove(child, 1);
|
|
|
|
continue;
|
|
}
|
|
|
|
status = acpi_get_type(chandle, &type);
|
|
if (ACPI_FAILURE(status)) {
|
|
continue;
|
|
}
|
|
/*
|
|
* If there is a device corresponding to chandle then
|
|
* parse it (depth-first).
|
|
*/
|
|
if (acpi_bus_get_device(chandle, &child) == 0) {
|
|
level++;
|
|
phandle = chandle;
|
|
chandle = NULL;
|
|
parent = child;
|
|
}
|
|
continue;
|
|
}
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_bus_trim);
|
|
|
|
static int acpi_bus_scan_fixed(void)
|
|
{
|
|
int result = 0;
|
|
struct acpi_device *device = NULL;
|
|
struct acpi_bus_ops ops;
|
|
|
|
memset(&ops, 0, sizeof(ops));
|
|
ops.acpi_op_add = 1;
|
|
ops.acpi_op_start = 1;
|
|
|
|
/*
|
|
* Enumerate all fixed-feature devices.
|
|
*/
|
|
if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
|
|
result = acpi_add_single_object(&device, NULL,
|
|
ACPI_BUS_TYPE_POWER_BUTTON,
|
|
ACPI_STA_DEFAULT,
|
|
&ops);
|
|
}
|
|
|
|
if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
|
|
result = acpi_add_single_object(&device, NULL,
|
|
ACPI_BUS_TYPE_SLEEP_BUTTON,
|
|
ACPI_STA_DEFAULT,
|
|
&ops);
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
int __init acpi_scan_init(void)
|
|
{
|
|
int result;
|
|
struct acpi_bus_ops ops;
|
|
|
|
memset(&ops, 0, sizeof(ops));
|
|
ops.acpi_op_add = 1;
|
|
ops.acpi_op_start = 1;
|
|
|
|
result = bus_register(&acpi_bus_type);
|
|
if (result) {
|
|
/* We don't want to quit even if we failed to add suspend/resume */
|
|
printk(KERN_ERR PREFIX "Could not register bus type\n");
|
|
}
|
|
|
|
/*
|
|
* Enumerate devices in the ACPI namespace.
|
|
*/
|
|
result = acpi_bus_scan(ACPI_ROOT_OBJECT, &ops, &acpi_root);
|
|
|
|
if (!result)
|
|
result = acpi_bus_scan_fixed();
|
|
|
|
if (result)
|
|
acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
|
|
|
|
return result;
|
|
}
|