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>
此提交包含在：
Thomas Renninger
@@ -16,7 +16,7 @@ ACPI_MODULE_NAME("scan");
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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 "ACPI_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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static LIST_HEAD(acpi_device_list);
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@@ -29,6 +29,62 @@ struct acpi_device_bus_id{
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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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int create_modalias(struct acpi_device *acpi_dev, char *modalias, int size){
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int len;
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if (!acpi_dev->flags.hardware_id)
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return -ENODEV;
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len = snprintf(modalias, size, "acpi:%s:",
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acpi_dev->pnp.hardware_id);
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if (len < 0 || len >= size)
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return -EINVAL;
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size -= len;
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if (acpi_dev->flags.compatible_ids) {
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struct acpi_compatible_id_list *cid_list;
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int i;
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int count;
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cid_list = acpi_dev->pnp.cid_list;
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for (i = 0; i < cid_list->count; i++) {
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count = snprintf(&modalias[len], size, "%s:",
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cid_list->id[i].value);
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if (count < 0 || count >= size) {
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printk(KERN_ERR "acpi: %s cid[%i] exceeds event buffer size",
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acpi_dev->pnp.device_name, i);
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break;
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}
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len += count;
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size -= count;
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}
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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 int acpi_eject_operation(acpi_handle handle, int lockable)
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{
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struct acpi_object_list arg_list;
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@@ -154,6 +210,12 @@ static int acpi_device_setup_files(struct acpi_device *dev)
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goto end;
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}
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if (dev->flags.hardware_id || dev->flags.compatible_ids){
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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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/*
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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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@@ -178,6 +240,9 @@ static void acpi_device_remove_files(struct acpi_device *dev)
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if (ACPI_SUCCESS(status))
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device_remove_file(&dev->dev, &dev_attr_eject);
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if (dev->flags.hardware_id || dev->flags.compatible_ids)
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device_remove_file(&dev->dev, &dev_attr_modalias);
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if(dev->flags.hardware_id)
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device_remove_file(&dev->dev, &dev_attr_hid);
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if(dev->handle)
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@@ -186,6 +251,37 @@ static void acpi_device_remove_files(struct acpi_device *dev)
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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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if (device->flags.hardware_id) {
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for (id = ids; id->id[0]; id++) {
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if (!strcmp((char*)id->id, device->pnp.hardware_id))
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return 0;
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}
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}
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if (device->flags.compatible_ids) {
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struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
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int i;
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for (id = ids; id->id[0]; id++) {
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/* compare multiple _CID entries against driver ids */
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for (i = 0; i < cid_list->count; i++) {
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if (!strcmp((char*)id->id,
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cid_list->id[i].value))
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return 0;
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}
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}
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}
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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_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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@@ -219,37 +315,19 @@ static int acpi_bus_match(struct device *dev, struct device_driver *drv)
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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_ids(acpi_dev, acpi_drv->ids);
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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, char **envp, int num_envp,
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char *buffer, int buffer_size)
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char *buffer, int buffer_size)
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{
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struct acpi_device *acpi_dev = to_acpi_device(dev);
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int i = 0, length = 0, ret = 0;
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if (acpi_dev->flags.hardware_id)
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ret = add_uevent_var(envp, num_envp, &i,
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buffer, buffer_size, &length,
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"HWID=%s", acpi_dev->pnp.hardware_id);
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if (ret)
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return -ENOMEM;
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if (acpi_dev->flags.compatible_ids) {
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int j;
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struct acpi_compatible_id_list *cid_list;
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cid_list = acpi_dev->pnp.cid_list;
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for (j = 0; j < cid_list->count; j++) {
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ret = add_uevent_var(envp, num_envp, &i, buffer,
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buffer_size, &length, "COMPTID=%s",
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cid_list->id[j].value);
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if (ret)
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return -ENOMEM;
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}
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strcpy(buffer, "MODALIAS=");
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if (create_modalias(acpi_dev, buffer + 9, buffer_size - 9) > 0) {
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envp[0] = buffer;
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envp[1] = NULL;
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}
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envp[i] = NULL;
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return 0;
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}
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@@ -543,25 +621,6 @@ void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context)
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return;
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}
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int acpi_match_ids(struct acpi_device *device, char *ids)
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{
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if (device->flags.hardware_id)
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if (strstr(ids, device->pnp.hardware_id))
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return 0;
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if (device->flags.compatible_ids) {
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struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
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int i;
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/* compare multiple _CID entries against driver ids */
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for (i = 0; i < cid_list->count; i++) {
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if (strstr(ids, cid_list->id[i].value))
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return 0;
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}
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}
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return -ENOENT;
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}
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static int acpi_bus_get_perf_flags(struct acpi_device *device)
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{
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device->performance.state = ACPI_STATE_UNKNOWN;
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@@ -624,6 +683,13 @@ static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
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struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
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union acpi_object *package = NULL;
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struct acpi_device_id button_device_ids[] = {
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{"PNP0C0D", 0},
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{"PNP0C0C", 0},
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{"PNP0C0E", 0},
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{"", 0},
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};
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/* _PRW */
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status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
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@@ -643,7 +709,7 @@ static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
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device->wakeup.flags.valid = 1;
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/* Power button, Lid switch always enable wakeup */
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if (!acpi_match_ids(device, "PNP0C0D,PNP0C0C,PNP0C0E"))
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if (!acpi_match_device_ids(device, button_device_ids))
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device->wakeup.flags.run_wake = 1;
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end:
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