ACPI: autoload modules - Create ACPI alias interface

Modify modpost (file2alias.c) to add acpi*:XYZ0001: alias in modules.alias
like:
grep acpi /lib/modules/2.6.22-rc4-default/modules.alias
alias acpi*:SNY5001:* sony_laptop
alias acpi*:SNY6001:* sony_laptop
for e.g. the sony_laptop module.
This module matches against all ACPI devices with a HID or CID of SNY5001
or SNY6001

Export an uevent and modalias sysfs file containing the string:
[MODALIAS=]acpi:PNP0C0C:
additional CIDs are concatenated at the end.

Signed-off-by: Thomas Renninger <trenn@suse.de>
Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Thomas Renninger 2007-07-23 14:43:51 +02:00 committed by Len Brown
parent 8c8eb78f67
commit 29b71a1ca7
5 changed files with 142 additions and 52 deletions

View file

@ -16,7 +16,7 @@ ACPI_MODULE_NAME("scan");
extern struct acpi_device *acpi_root;
#define ACPI_BUS_CLASS "system_bus"
#define ACPI_BUS_HID "ACPI_BUS"
#define ACPI_BUS_HID "LNXSYBUS"
#define ACPI_BUS_DEVICE_NAME "System Bus"
static LIST_HEAD(acpi_device_list);
@ -29,6 +29,62 @@ struct acpi_device_bus_id{
unsigned int instance_no;
struct list_head node;
};
/*
* Creates hid/cid(s) string needed for modalias and uevent
* e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
* char *modalias: "acpi:IBM0001:ACPI0001"
*/
int create_modalias(struct acpi_device *acpi_dev, char *modalias, int size){
int len;
if (!acpi_dev->flags.hardware_id)
return -ENODEV;
len = snprintf(modalias, size, "acpi:%s:",
acpi_dev->pnp.hardware_id);
if (len < 0 || len >= size)
return -EINVAL;
size -= len;
if (acpi_dev->flags.compatible_ids) {
struct acpi_compatible_id_list *cid_list;
int i;
int count;
cid_list = acpi_dev->pnp.cid_list;
for (i = 0; i < cid_list->count; i++) {
count = snprintf(&modalias[len], size, "%s:",
cid_list->id[i].value);
if (count < 0 || count >= size) {
printk(KERN_ERR "acpi: %s cid[%i] exceeds event buffer size",
acpi_dev->pnp.device_name, i);
break;
}
len += count;
size -= count;
}
}
modalias[len] = '\0';
return len;
}
static ssize_t
acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
struct acpi_device *acpi_dev = to_acpi_device(dev);
int len;
/* Device has no HID and no CID or string is >1024 */
len = create_modalias(acpi_dev, buf, 1024);
if (len <= 0)
return 0;
buf[len++] = '\n';
return len;
}
static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
static int acpi_eject_operation(acpi_handle handle, int lockable)
{
struct acpi_object_list arg_list;
@ -154,6 +210,12 @@ static int acpi_device_setup_files(struct acpi_device *dev)
goto end;
}
if (dev->flags.hardware_id || dev->flags.compatible_ids){
result = device_create_file(&dev->dev, &dev_attr_modalias);
if(result)
goto end;
}
/*
* If device has _EJ0, 'eject' file is created that is used to trigger
* hot-removal function from userland.
@ -178,6 +240,9 @@ static void acpi_device_remove_files(struct acpi_device *dev)
if (ACPI_SUCCESS(status))
device_remove_file(&dev->dev, &dev_attr_eject);
if (dev->flags.hardware_id || dev->flags.compatible_ids)
device_remove_file(&dev->dev, &dev_attr_modalias);
if(dev->flags.hardware_id)
device_remove_file(&dev->dev, &dev_attr_hid);
if(dev->handle)
@ -186,6 +251,37 @@ static void acpi_device_remove_files(struct acpi_device *dev)
/* --------------------------------------------------------------------------
ACPI Bus operations
-------------------------------------------------------------------------- */
int acpi_match_device_ids(struct acpi_device *device,
const struct acpi_device_id *ids)
{
const struct acpi_device_id *id;
if (device->flags.hardware_id) {
for (id = ids; id->id[0]; id++) {
if (!strcmp((char*)id->id, device->pnp.hardware_id))
return 0;
}
}
if (device->flags.compatible_ids) {
struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
int i;
for (id = ids; id->id[0]; id++) {
/* compare multiple _CID entries against driver ids */
for (i = 0; i < cid_list->count; i++) {
if (!strcmp((char*)id->id,
cid_list->id[i].value))
return 0;
}
}
}
return -ENOENT;
}
EXPORT_SYMBOL(acpi_match_device_ids);
static void acpi_device_release(struct device *dev)
{
struct acpi_device *acpi_dev = to_acpi_device(dev);
@ -219,37 +315,19 @@ static int acpi_bus_match(struct device *dev, struct device_driver *drv)
struct acpi_device *acpi_dev = to_acpi_device(dev);
struct acpi_driver *acpi_drv = to_acpi_driver(drv);
return !acpi_match_ids(acpi_dev, acpi_drv->ids);
return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
}
static int acpi_device_uevent(struct device *dev, char **envp, int num_envp,
char *buffer, int buffer_size)
char *buffer, int buffer_size)
{
struct acpi_device *acpi_dev = to_acpi_device(dev);
int i = 0, length = 0, ret = 0;
if (acpi_dev->flags.hardware_id)
ret = add_uevent_var(envp, num_envp, &i,
buffer, buffer_size, &length,
"HWID=%s", acpi_dev->pnp.hardware_id);
if (ret)
return -ENOMEM;
if (acpi_dev->flags.compatible_ids) {
int j;
struct acpi_compatible_id_list *cid_list;
cid_list = acpi_dev->pnp.cid_list;
for (j = 0; j < cid_list->count; j++) {
ret = add_uevent_var(envp, num_envp, &i, buffer,
buffer_size, &length, "COMPTID=%s",
cid_list->id[j].value);
if (ret)
return -ENOMEM;
}
strcpy(buffer, "MODALIAS=");
if (create_modalias(acpi_dev, buffer + 9, buffer_size - 9) > 0) {
envp[0] = buffer;
envp[1] = NULL;
}
envp[i] = NULL;
return 0;
}
@ -543,25 +621,6 @@ void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context)
return;
}
int acpi_match_ids(struct acpi_device *device, char *ids)
{
if (device->flags.hardware_id)
if (strstr(ids, device->pnp.hardware_id))
return 0;
if (device->flags.compatible_ids) {
struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
int i;
/* compare multiple _CID entries against driver ids */
for (i = 0; i < cid_list->count; i++) {
if (strstr(ids, cid_list->id[i].value))
return 0;
}
}
return -ENOENT;
}
static int acpi_bus_get_perf_flags(struct acpi_device *device)
{
device->performance.state = ACPI_STATE_UNKNOWN;
@ -624,6 +683,13 @@ static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
union acpi_object *package = NULL;
struct acpi_device_id button_device_ids[] = {
{"PNP0C0D", 0},
{"PNP0C0C", 0},
{"PNP0C0E", 0},
{"", 0},
};
/* _PRW */
status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
@ -643,7 +709,7 @@ static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
device->wakeup.flags.valid = 1;
/* Power button, Lid switch always enable wakeup */
if (!acpi_match_ids(device, "PNP0C0D,PNP0C0C,PNP0C0E"))
if (!acpi_match_device_ids(device, button_device_ids))
device->wakeup.flags.run_wake = 1;
end:

View file

@ -21,7 +21,10 @@
#include <linux/acpi.h>
#include <linux/pnp.h>
#include <linux/mod_devicetable.h>
#include <acpi/acpi_bus.h>
#include <acpi/actypes.h>
#include "pnpacpi.h"
static int num = 0;
@ -33,15 +36,17 @@ static int num = 0;
* have irqs (PIC, Timer) because we call acpi_register_gsi.
* Finaly only devices that have a CRS method need to be in this list.
*/
static char __initdata excluded_id_list[] =
"PNP0C09," /* EC */
"PNP0C0F," /* Link device */
"PNP0000," /* PIC */
"PNP0100," /* Timer */
;
static __initdata struct acpi_device_id excluded_id_list[] ={
{"PNP0C09", 0}, /* EC */
{"PNP0C0F", 0}, /* Link device */
{"PNP0000", 0}, /* PIC */
{"PNP0100", 0}, /* Timer */
{"", 0},
};
static inline int is_exclusive_device(struct acpi_device *dev)
{
return (!acpi_match_ids(dev, excluded_id_list));
return (!acpi_match_device_ids(dev, excluded_id_list));
}
/*

View file

@ -33,6 +33,7 @@
#endif
#include <linux/list.h>
#include <linux/mod_devicetable.h>
#include <acpi/acpi.h>
#include <acpi/acpi_bus.h>

View file

@ -159,6 +159,12 @@ struct ap_device_id {
#define AP_DEVICE_ID_MATCH_DEVICE_TYPE 0x01
#define ACPI_ID_LEN 9
struct acpi_device_id {
__u8 id[ACPI_ID_LEN];
kernel_ulong_t driver_data;
};
#define PNP_ID_LEN 8
#define PNP_MAX_DEVICES 8

View file

@ -290,6 +290,14 @@ static int do_serio_entry(const char *filename,
return 1;
}
/* looks like: "acpi:ACPI0003 or acpi:PNP0C0B" or "acpi:LNXVIDEO" */
static int do_acpi_entry(const char *filename,
struct acpi_device_id *id, char *alias)
{
sprintf(alias, "acpi*:%s:", id->id);
return 1;
}
/* looks like: "pnp:dD" */
static int do_pnp_entry(const char *filename,
struct pnp_device_id *id, char *alias)
@ -551,6 +559,10 @@ void handle_moddevtable(struct module *mod, struct elf_info *info,
do_table(symval, sym->st_size,
sizeof(struct serio_device_id), "serio",
do_serio_entry, mod);
else if (sym_is(symname, "__mod_acpi_device_table"))
do_table(symval, sym->st_size,
sizeof(struct acpi_device_id), "acpi",
do_acpi_entry, mod);
else if (sym_is(symname, "__mod_pnp_device_table"))
do_table(symval, sym->st_size,
sizeof(struct pnp_device_id), "pnp",