diff options
Diffstat (limited to 'drivers/platform/x86/wmi.c')
| -rw-r--r-- | drivers/platform/x86/wmi.c | 175 |
1 files changed, 173 insertions, 2 deletions
diff --git a/drivers/platform/x86/wmi.c b/drivers/platform/x86/wmi.c index 177f8d767df..e425a868cd3 100644 --- a/drivers/platform/x86/wmi.c +++ b/drivers/platform/x86/wmi.c @@ -30,6 +30,7 @@ #include <linux/kernel.h> #include <linux/init.h> #include <linux/types.h> +#include <linux/device.h> #include <linux/list.h> #include <linux/acpi.h> #include <acpi/acpi_bus.h> @@ -65,6 +66,7 @@ struct wmi_block { acpi_handle handle; wmi_notify_handler handler; void *handler_data; + struct device *dev; }; static struct wmi_block wmi_blocks; @@ -195,6 +197,34 @@ static bool wmi_parse_guid(const u8 *src, u8 *dest) return true; } +/* + * Convert a raw GUID to the ACII string representation + */ +static int wmi_gtoa(const char *in, char *out) +{ + int i; + + for (i = 3; i >= 0; i--) + out += sprintf(out, "%02X", in[i] & 0xFF); + + out += sprintf(out, "-"); + out += sprintf(out, "%02X", in[5] & 0xFF); + out += sprintf(out, "%02X", in[4] & 0xFF); + out += sprintf(out, "-"); + out += sprintf(out, "%02X", in[7] & 0xFF); + out += sprintf(out, "%02X", in[6] & 0xFF); + out += sprintf(out, "-"); + out += sprintf(out, "%02X", in[8] & 0xFF); + out += sprintf(out, "%02X", in[9] & 0xFF); + out += sprintf(out, "-"); + + for (i = 10; i <= 15; i++) + out += sprintf(out, "%02X", in[i] & 0xFF); + + out = '\0'; + return 0; +} + static bool find_guid(const char *guid_string, struct wmi_block **out) { char tmp[16], guid_input[16]; @@ -555,6 +585,138 @@ bool wmi_has_guid(const char *guid_string) EXPORT_SYMBOL_GPL(wmi_has_guid); /* + * sysfs interface + */ +static ssize_t show_modalias(struct device *dev, struct device_attribute *attr, + char *buf) +{ + char guid_string[37]; + struct wmi_block *wblock; + + wblock = dev_get_drvdata(dev); + if (!wblock) + return -ENOMEM; + + wmi_gtoa(wblock->gblock.guid, guid_string); + + return sprintf(buf, "wmi:%s\n", guid_string); +} +static DEVICE_ATTR(modalias, S_IRUGO, show_modalias, NULL); + +static int wmi_dev_uevent(struct device *dev, struct kobj_uevent_env *env) +{ + char guid_string[37]; + + struct wmi_block *wblock; + + if (add_uevent_var(env, "MODALIAS=")) + return -ENOMEM; + + wblock = dev_get_drvdata(dev); + if (!wblock) + return -ENOMEM; + + wmi_gtoa(wblock->gblock.guid, guid_string); + + strcpy(&env->buf[env->buflen - 1], "wmi:"); + memcpy(&env->buf[env->buflen - 1 + 4], guid_string, 36); + env->buflen += 40; + + return 0; +} + +static void wmi_dev_free(struct device *dev) +{ + kfree(dev); +} + +static struct class wmi_class = { + .name = "wmi", + .dev_release = wmi_dev_free, + .dev_uevent = wmi_dev_uevent, +}; + +static int wmi_create_devs(void) +{ + int result; + char guid_string[37]; + struct guid_block *gblock; + struct wmi_block *wblock; + struct list_head *p; + struct device *guid_dev; + + /* Create devices for all the GUIDs */ + list_for_each(p, &wmi_blocks.list) { + wblock = list_entry(p, struct wmi_block, list); + + guid_dev = kzalloc(sizeof(struct device), GFP_KERNEL); + if (!guid_dev) + return -ENOMEM; + + wblock->dev = guid_dev; + + guid_dev->class = &wmi_class; + dev_set_drvdata(guid_dev, wblock); + + gblock = &wblock->gblock; + + wmi_gtoa(gblock->guid, guid_string); + dev_set_name(guid_dev, guid_string); + + result = device_register(guid_dev); + if (result) + return result; + + result = device_create_file(guid_dev, &dev_attr_modalias); + if (result) + return result; + } + + return 0; +} + +static void wmi_remove_devs(void) +{ + struct guid_block *gblock; + struct wmi_block *wblock; + struct list_head *p; + struct device *guid_dev; + + /* Delete devices for all the GUIDs */ + list_for_each(p, &wmi_blocks.list) { + wblock = list_entry(p, struct wmi_block, list); + + guid_dev = wblock->dev; + gblock = &wblock->gblock; + + device_remove_file(guid_dev, &dev_attr_modalias); + + device_unregister(guid_dev); + } +} + +static void wmi_class_exit(void) +{ + wmi_remove_devs(); + class_unregister(&wmi_class); +} + +static int wmi_class_init(void) +{ + int ret; + + ret = class_register(&wmi_class); + if (ret) + return ret; + + ret = wmi_create_devs(); + if (ret) + wmi_class_exit(); + + return ret; +} + +/* * Parse the _WDG method for the GUID data blocks */ static __init acpi_status parse_wdg(acpi_handle handle) @@ -709,10 +871,17 @@ static int __init acpi_wmi_init(void) if (result < 0) { printk(KERN_INFO PREFIX "Error loading mapper\n"); - } else { - printk(KERN_INFO PREFIX "Mapper loaded\n"); + return -ENODEV; + } + + result = wmi_class_init(); + if (result) { + acpi_bus_unregister_driver(&acpi_wmi_driver); + return result; } + printk(KERN_INFO PREFIX "Mapper loaded\n"); + return result; } @@ -721,6 +890,8 @@ static void __exit acpi_wmi_exit(void) struct list_head *p, *tmp; struct wmi_block *wblock; + wmi_class_exit(); + acpi_bus_unregister_driver(&acpi_wmi_driver); list_for_each_safe(p, tmp, &wmi_blocks.list) { |