dell-wmi-aio--.rar_All for One

/* * WMI hotkeys support for Dell All-In-One series * * * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/kernel.h> #include <linux/module.h> #include <linux/init.h> #include <linux/types.h> #include <linux/input.h> #include <linux/input/sparse-keymap.h> #include <acpi/acpi_drivers.h> #include <linux/acpi.h> #include <linux/string.h> MODULE_DESCRIPTION("WMI hotkeys driver for Dell All-In-One series"); MODULE_LICENSE("GPL"); #define EVENT_GUID1 "284A0E6B-380E-472A-921F-E52786257FB4" #define EVENT_GUID2 "02314822-307C-4F66-BF0E-48AEAEB26CC8" static const char *dell_wmi_aio_guids[] = { EVENT_GUID1, EVENT_GUID2, NULL }; MODULE_ALIAS("wmi:"EVENT_GUID1); MODULE_ALIAS("wmi:"EVENT_GUID2); static const struct key_entry dell_wmi_aio_keymap[] = { { KE_KEY, 0xc0, { KEY_VOLUMEUP } }, { KE_KEY, 0xc1, { KEY_VOLUMEDOWN } }, { KE_END, 0 } }; static struct input_dev *dell_wmi_aio_input_dev; static void dell_wmi_aio_notify(u32 value, void *context) { struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL }; union acpi_object *obj; acpi_status status; status = wmi_get_event_data(value, &response); if (status != AE_OK) { pr_info("bad event status 0x%x\n", status); return; } obj = (union acpi_object *)response.pointer; if (obj) { unsigned int scancode; switch (obj->type) { case ACPI_TYPE_INTEGER: /* Most All-In-One correctly return integer scancode */ scancode = obj->integer.value; sparse_keymap_report_event(dell_wmi_aio_input_dev, scancode, 1, true); break; case ACPI_TYPE_BUFFER: /* Broken machines return the scancode in a buffer */ if (obj->buffer.pointer && obj->buffer.length > 0) { scancode = obj->buffer.pointer[0]; sparse_keymap_report_event( dell_wmi_aio_input_dev, scancode, 1, true); } break; } } kfree(obj); } static int __init dell_wmi_aio_input_setup(void) { int err; dell_wmi_aio_input_dev = input_allocate_device(); if (!dell_wmi_aio_input_dev) return -ENOMEM; dell_wmi_aio_input_dev->name = "Dell AIO WMI hotkeys"; dell_wmi_aio_input_dev->phys = "wmi/input0"; dell_wmi_aio_input_dev->id.bustype = BUS_HOST; err = sparse_keymap_setup(dell_wmi_aio_input_dev, dell_wmi_aio_keymap, NULL); if (err) { pr_err("Unable to setup input device keymap\n"); goto err_free_dev; } err = input_register_device(dell_wmi_aio_input_dev); if (err) { pr_info("Unable to register input device\n"); goto err_free_keymap; } return 0; err_free_keymap: sparse_keymap_free(dell_wmi_aio_input_dev); err_free_dev: input_free_device(dell_wmi_aio_input_dev); return err; } static const char *dell_wmi_aio_find(void) { int i; for (i = 0; dell_wmi_aio_guids[i] != NULL; i++) if (wmi_has_guid(dell_wmi_aio_guids[i])) return dell_wmi_aio_guids[i]; return NULL; } static int __init dell_wmi_aio_init(void) { int err; const char *guid; guid = dell_wmi_aio_find(); if (!guid) { pr_warn("No known WMI GUID found\n"); return -ENXIO; } err = dell_wmi_aio_input_setup(); if (err) return err; err = wmi_install_notify_handler(guid, dell_wmi_aio_notify, NULL); if (err) { pr_err("Unable to register notify handler - %d\n", err); sparse_keymap_free(dell_wmi_aio_input_dev); input_unregister_device(dell_wmi_aio_input_dev); return err; } return 0; } static void __exit dell_wmi_aio_exit(void) { const char *guid; guid = dell_wmi_aio_find(); wmi_remove_notify_handler(guid); sparse_keymap_free(dell_wmi_aio_input_dev); input_unregister_device(dell_wmi_aio_input_dev); } module_init(dell_wmi_aio_init); module_exit(dell_wmi_aio_exit);