4 * Copyright (C) 2008 Red Hat <mjg@redhat.com>
5 * Copyright (C) 2010, 2011 Anssi Hannula <anssi.hannula@iki.fi>
7 * Portions based on wistron_btns.c:
8 * Copyright (C) 2005 Miloslav Trmac <mitr@volny.cz>
9 * Copyright (C) 2005 Bernhard Rosenkraenzer <bero@arklinux.org>
10 * Copyright (C) 2005 Dmitry Torokhov <dtor@mail.ru>
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
27 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
29 #include <linux/kernel.h>
30 #include <linux/module.h>
31 #include <linux/init.h>
32 #include <linux/slab.h>
33 #include <linux/types.h>
34 #include <linux/input.h>
35 #include <linux/input/sparse-keymap.h>
36 #include <linux/platform_device.h>
37 #include <linux/acpi.h>
38 #include <linux/rfkill.h>
39 #include <linux/string.h>
41 MODULE_AUTHOR("Matthew Garrett <mjg59@srcf.ucam.org>");
42 MODULE_DESCRIPTION("HP laptop WMI hotkeys driver");
43 MODULE_LICENSE("GPL");
45 MODULE_ALIAS("wmi:95F24279-4D7B-4334-9387-ACCDC67EF61C");
46 MODULE_ALIAS("wmi:5FB7F034-2C63-45e9-BE91-3D44E2C707E4");
48 #define HPWMI_EVENT_GUID "95F24279-4D7B-4334-9387-ACCDC67EF61C"
49 #define HPWMI_BIOS_GUID "5FB7F034-2C63-45e9-BE91-3D44E2C707E4"
51 #define HPWMI_DISPLAY_QUERY 0x1
52 #define HPWMI_HDDTEMP_QUERY 0x2
53 #define HPWMI_ALS_QUERY 0x3
54 #define HPWMI_HARDWARE_QUERY 0x4
55 #define HPWMI_WIRELESS_QUERY 0x5
56 #define HPWMI_HOTKEY_QUERY 0xc
57 #define HPWMI_WIRELESS2_QUERY 0x1b
65 enum hp_wmi_event_ids {
68 HPWMI_SMART_ADAPTER = 3,
69 HPWMI_BEZEL_BUTTON = 4,
71 HPWMI_CPU_BATTERY_THROTTLE = 6,
72 HPWMI_LOCK_SWITCH = 7,
75 static int __devinit hp_wmi_bios_setup(struct platform_device *device);
76 static int __exit hp_wmi_bios_remove(struct platform_device *device);
77 static int hp_wmi_resume_handler(struct device *device);
92 enum hp_return_value {
93 HPWMI_RET_WRONG_SIGNATURE = 0x02,
94 HPWMI_RET_UNKNOWN_COMMAND = 0x03,
95 HPWMI_RET_UNKNOWN_CMDTYPE = 0x04,
96 HPWMI_RET_INVALID_PARAMETERS = 0x05,
99 enum hp_wireless2_bits {
100 HPWMI_POWER_STATE = 0x01,
101 HPWMI_POWER_SOFT = 0x02,
102 HPWMI_POWER_BIOS = 0x04,
103 HPWMI_POWER_HARD = 0x08,
106 #define IS_HWBLOCKED(x) ((x & (HPWMI_POWER_BIOS | HPWMI_POWER_HARD)) \
107 != (HPWMI_POWER_BIOS | HPWMI_POWER_HARD))
108 #define IS_SWBLOCKED(x) !(x & HPWMI_POWER_SOFT)
110 struct bios_rfkill2_device_state {
115 u16 subsys_vendor_id;
116 u16 subsys_product_id;
122 /* 7 devices fit into the 128 byte buffer */
123 #define HPWMI_MAX_RFKILL2_DEVICES 7
125 struct bios_rfkill2_state {
129 struct bios_rfkill2_device_state device[HPWMI_MAX_RFKILL2_DEVICES];
132 static const struct key_entry hp_wmi_keymap[] = {
133 { KE_KEY, 0x02, { KEY_BRIGHTNESSUP } },
134 { KE_KEY, 0x03, { KEY_BRIGHTNESSDOWN } },
135 { KE_KEY, 0x20e6, { KEY_PROG1 } },
136 { KE_KEY, 0x20e8, { KEY_MEDIA } },
137 { KE_KEY, 0x2142, { KEY_MEDIA } },
138 { KE_KEY, 0x213b, { KEY_INFO } },
139 { KE_KEY, 0x2169, { KEY_DIRECTION } },
140 { KE_KEY, 0x231b, { KEY_HELP } },
144 static struct input_dev *hp_wmi_input_dev;
145 static struct platform_device *hp_wmi_platform_dev;
147 static struct rfkill *wifi_rfkill;
148 static struct rfkill *bluetooth_rfkill;
149 static struct rfkill *wwan_rfkill;
151 struct rfkill2_device {
154 struct rfkill *rfkill;
157 static int rfkill2_count;
158 static struct rfkill2_device rfkill2[HPWMI_MAX_RFKILL2_DEVICES];
160 static const struct dev_pm_ops hp_wmi_pm_ops = {
161 .resume = hp_wmi_resume_handler,
162 .restore = hp_wmi_resume_handler,
165 static struct platform_driver hp_wmi_driver = {
168 .owner = THIS_MODULE,
169 .pm = &hp_wmi_pm_ops,
171 .probe = hp_wmi_bios_setup,
172 .remove = hp_wmi_bios_remove,
176 * hp_wmi_perform_query
178 * query: The commandtype -> What should be queried
179 * write: The command -> 0 read, 1 write, 3 ODM specific
180 * buffer: Buffer used as input and/or output
181 * insize: Size of input buffer
182 * outsize: Size of output buffer
184 * returns zero on success
185 * an HP WMI query specific error code (which is positive)
186 * -EINVAL if the query was not successful at all
187 * -EINVAL if the output buffer size exceeds buffersize
189 * Note: The buffersize must at least be the maximum of the input and output
190 * size. E.g. Battery info query (0x7) is defined to have 1 byte input
191 * and 128 byte output. The caller would do:
192 * buffer = kzalloc(128, GFP_KERNEL);
193 * ret = hp_wmi_perform_query(0x7, 0, buffer, 1, 128)
195 static int hp_wmi_perform_query(int query, int write, void *buffer,
196 int insize, int outsize)
198 struct bios_return *bios_return;
200 union acpi_object *obj;
201 struct bios_args args = {
202 .signature = 0x55434553,
203 .command = write ? 0x2 : 0x1,
204 .commandtype = query,
208 struct acpi_buffer input = { sizeof(struct bios_args), &args };
209 struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
212 if (WARN_ON(insize > sizeof(args.data)))
214 memcpy(&args.data, buffer, insize);
216 wmi_evaluate_method(HPWMI_BIOS_GUID, 0, 0x3, &input, &output);
218 obj = output.pointer;
222 else if (obj->type != ACPI_TYPE_BUFFER) {
227 bios_return = (struct bios_return *)obj->buffer.pointer;
228 rc = bios_return->return_code;
231 if (rc != HPWMI_RET_UNKNOWN_CMDTYPE)
232 pr_warn("query 0x%x returned error 0x%x\n", query, rc);
238 /* ignore output data */
243 actual_outsize = min(outsize, (int)(obj->buffer.length - sizeof(*bios_return)));
244 memcpy(buffer, obj->buffer.pointer + sizeof(*bios_return), actual_outsize);
245 memset(buffer + actual_outsize, 0, outsize - actual_outsize);
250 static int hp_wmi_display_state(void)
253 int ret = hp_wmi_perform_query(HPWMI_DISPLAY_QUERY, 0, &state,
254 sizeof(state), sizeof(state));
260 static int hp_wmi_hddtemp_state(void)
263 int ret = hp_wmi_perform_query(HPWMI_HDDTEMP_QUERY, 0, &state,
264 sizeof(state), sizeof(state));
270 static int hp_wmi_als_state(void)
273 int ret = hp_wmi_perform_query(HPWMI_ALS_QUERY, 0, &state,
274 sizeof(state), sizeof(state));
280 static int hp_wmi_dock_state(void)
283 int ret = hp_wmi_perform_query(HPWMI_HARDWARE_QUERY, 0, &state,
284 sizeof(state), sizeof(state));
292 static int hp_wmi_tablet_state(void)
295 int ret = hp_wmi_perform_query(HPWMI_HARDWARE_QUERY, 0, &state,
296 sizeof(state), sizeof(state));
300 return (state & 0x4) ? 1 : 0;
303 static int hp_wmi_set_block(void *data, bool blocked)
305 enum hp_wmi_radio r = (enum hp_wmi_radio) data;
306 int query = BIT(r + 8) | ((!blocked) << r);
309 ret = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 1,
310 &query, sizeof(query), 0);
316 static const struct rfkill_ops hp_wmi_rfkill_ops = {
317 .set_block = hp_wmi_set_block,
320 static bool hp_wmi_get_sw_state(enum hp_wmi_radio r)
324 hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0,
325 &wireless, sizeof(wireless),
327 /* TBD: Pass error */
329 mask = 0x200 << (r * 8);
337 static bool hp_wmi_get_hw_state(enum hp_wmi_radio r)
341 hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0,
342 &wireless, sizeof(wireless),
344 /* TBD: Pass error */
346 mask = 0x800 << (r * 8);
354 static int hp_wmi_rfkill2_set_block(void *data, bool blocked)
356 int rfkill_id = (int)(long)data;
357 char buffer[4] = { 0x01, 0x00, rfkill_id, !blocked };
359 if (hp_wmi_perform_query(HPWMI_WIRELESS2_QUERY, 1,
360 buffer, sizeof(buffer), 0))
365 static const struct rfkill_ops hp_wmi_rfkill2_ops = {
366 .set_block = hp_wmi_rfkill2_set_block,
369 static int hp_wmi_rfkill2_refresh(void)
372 struct bios_rfkill2_state state;
374 err = hp_wmi_perform_query(HPWMI_WIRELESS2_QUERY, 0, &state,
379 for (i = 0; i < rfkill2_count; i++) {
380 int num = rfkill2[i].num;
381 struct bios_rfkill2_device_state *devstate;
382 devstate = &state.device[num];
384 if (num >= state.count ||
385 devstate->rfkill_id != rfkill2[i].id) {
386 pr_warn("power configuration of the wireless devices unexpectedly changed\n");
390 rfkill_set_states(rfkill2[i].rfkill,
391 IS_SWBLOCKED(devstate->power),
392 IS_HWBLOCKED(devstate->power));
398 static ssize_t show_display(struct device *dev, struct device_attribute *attr,
401 int value = hp_wmi_display_state();
404 return sprintf(buf, "%d\n", value);
407 static ssize_t show_hddtemp(struct device *dev, struct device_attribute *attr,
410 int value = hp_wmi_hddtemp_state();
413 return sprintf(buf, "%d\n", value);
416 static ssize_t show_als(struct device *dev, struct device_attribute *attr,
419 int value = hp_wmi_als_state();
422 return sprintf(buf, "%d\n", value);
425 static ssize_t show_dock(struct device *dev, struct device_attribute *attr,
428 int value = hp_wmi_dock_state();
431 return sprintf(buf, "%d\n", value);
434 static ssize_t show_tablet(struct device *dev, struct device_attribute *attr,
437 int value = hp_wmi_tablet_state();
440 return sprintf(buf, "%d\n", value);
443 static ssize_t set_als(struct device *dev, struct device_attribute *attr,
444 const char *buf, size_t count)
446 u32 tmp = simple_strtoul(buf, NULL, 10);
447 int ret = hp_wmi_perform_query(HPWMI_ALS_QUERY, 1, &tmp,
448 sizeof(tmp), sizeof(tmp));
455 static DEVICE_ATTR(display, S_IRUGO, show_display, NULL);
456 static DEVICE_ATTR(hddtemp, S_IRUGO, show_hddtemp, NULL);
457 static DEVICE_ATTR(als, S_IRUGO | S_IWUSR, show_als, set_als);
458 static DEVICE_ATTR(dock, S_IRUGO, show_dock, NULL);
459 static DEVICE_ATTR(tablet, S_IRUGO, show_tablet, NULL);
461 static void hp_wmi_notify(u32 value, void *context)
463 struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
464 union acpi_object *obj;
465 u32 event_id, event_data;
466 int key_code = 0, ret;
470 status = wmi_get_event_data(value, &response);
471 if (status != AE_OK) {
472 pr_info("bad event status 0x%x\n", status);
476 obj = (union acpi_object *)response.pointer;
480 if (obj->type != ACPI_TYPE_BUFFER) {
481 pr_info("Unknown response received %d\n", obj->type);
487 * Depending on ACPI version the concatenation of id and event data
488 * inside _WED function will result in a 8 or 16 byte buffer.
490 location = (u32 *)obj->buffer.pointer;
491 if (obj->buffer.length == 8) {
492 event_id = *location;
493 event_data = *(location + 1);
494 } else if (obj->buffer.length == 16) {
495 event_id = *location;
496 event_data = *(location + 2);
498 pr_info("Unknown buffer length %d\n", obj->buffer.length);
505 case HPWMI_DOCK_EVENT:
506 input_report_switch(hp_wmi_input_dev, SW_DOCK,
507 hp_wmi_dock_state());
508 input_report_switch(hp_wmi_input_dev, SW_TABLET_MODE,
509 hp_wmi_tablet_state());
510 input_sync(hp_wmi_input_dev);
514 case HPWMI_SMART_ADAPTER:
516 case HPWMI_BEZEL_BUTTON:
517 ret = hp_wmi_perform_query(HPWMI_HOTKEY_QUERY, 0,
524 if (!sparse_keymap_report_event(hp_wmi_input_dev,
526 pr_info("Unknown key code - 0x%x\n", key_code);
530 hp_wmi_rfkill2_refresh();
535 rfkill_set_states(wifi_rfkill,
536 hp_wmi_get_sw_state(HPWMI_WIFI),
537 hp_wmi_get_hw_state(HPWMI_WIFI));
538 if (bluetooth_rfkill)
539 rfkill_set_states(bluetooth_rfkill,
540 hp_wmi_get_sw_state(HPWMI_BLUETOOTH),
541 hp_wmi_get_hw_state(HPWMI_BLUETOOTH));
543 rfkill_set_states(wwan_rfkill,
544 hp_wmi_get_sw_state(HPWMI_WWAN),
545 hp_wmi_get_hw_state(HPWMI_WWAN));
547 case HPWMI_CPU_BATTERY_THROTTLE:
548 pr_info("Unimplemented CPU throttle because of 3 Cell battery event detected\n");
550 case HPWMI_LOCK_SWITCH:
553 pr_info("Unknown event_id - %d - 0x%x\n", event_id, event_data);
558 static int __init hp_wmi_input_setup(void)
563 hp_wmi_input_dev = input_allocate_device();
564 if (!hp_wmi_input_dev)
567 hp_wmi_input_dev->name = "HP WMI hotkeys";
568 hp_wmi_input_dev->phys = "wmi/input0";
569 hp_wmi_input_dev->id.bustype = BUS_HOST;
571 __set_bit(EV_SW, hp_wmi_input_dev->evbit);
572 __set_bit(SW_DOCK, hp_wmi_input_dev->swbit);
573 __set_bit(SW_TABLET_MODE, hp_wmi_input_dev->swbit);
575 err = sparse_keymap_setup(hp_wmi_input_dev, hp_wmi_keymap, NULL);
579 /* Set initial hardware state */
580 input_report_switch(hp_wmi_input_dev, SW_DOCK, hp_wmi_dock_state());
581 input_report_switch(hp_wmi_input_dev, SW_TABLET_MODE,
582 hp_wmi_tablet_state());
583 input_sync(hp_wmi_input_dev);
585 status = wmi_install_notify_handler(HPWMI_EVENT_GUID, hp_wmi_notify, NULL);
586 if (ACPI_FAILURE(status)) {
588 goto err_free_keymap;
591 err = input_register_device(hp_wmi_input_dev);
593 goto err_uninstall_notifier;
597 err_uninstall_notifier:
598 wmi_remove_notify_handler(HPWMI_EVENT_GUID);
600 sparse_keymap_free(hp_wmi_input_dev);
602 input_free_device(hp_wmi_input_dev);
606 static void hp_wmi_input_destroy(void)
608 wmi_remove_notify_handler(HPWMI_EVENT_GUID);
609 sparse_keymap_free(hp_wmi_input_dev);
610 input_unregister_device(hp_wmi_input_dev);
613 static void cleanup_sysfs(struct platform_device *device)
615 device_remove_file(&device->dev, &dev_attr_display);
616 device_remove_file(&device->dev, &dev_attr_hddtemp);
617 device_remove_file(&device->dev, &dev_attr_als);
618 device_remove_file(&device->dev, &dev_attr_dock);
619 device_remove_file(&device->dev, &dev_attr_tablet);
622 static int __devinit hp_wmi_rfkill_setup(struct platform_device *device)
627 err = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, &wireless,
628 sizeof(wireless), sizeof(wireless));
632 if (wireless & 0x1) {
633 wifi_rfkill = rfkill_alloc("hp-wifi", &device->dev,
636 (void *) HPWMI_WIFI);
637 rfkill_init_sw_state(wifi_rfkill,
638 hp_wmi_get_sw_state(HPWMI_WIFI));
639 rfkill_set_hw_state(wifi_rfkill,
640 hp_wmi_get_hw_state(HPWMI_WIFI));
641 err = rfkill_register(wifi_rfkill);
643 goto register_wifi_error;
646 if (wireless & 0x2) {
647 bluetooth_rfkill = rfkill_alloc("hp-bluetooth", &device->dev,
648 RFKILL_TYPE_BLUETOOTH,
650 (void *) HPWMI_BLUETOOTH);
651 rfkill_init_sw_state(bluetooth_rfkill,
652 hp_wmi_get_sw_state(HPWMI_BLUETOOTH));
653 rfkill_set_hw_state(bluetooth_rfkill,
654 hp_wmi_get_hw_state(HPWMI_BLUETOOTH));
655 err = rfkill_register(bluetooth_rfkill);
657 goto register_bluetooth_error;
660 if (wireless & 0x4) {
661 wwan_rfkill = rfkill_alloc("hp-wwan", &device->dev,
664 (void *) HPWMI_WWAN);
665 rfkill_init_sw_state(wwan_rfkill,
666 hp_wmi_get_sw_state(HPWMI_WWAN));
667 rfkill_set_hw_state(wwan_rfkill,
668 hp_wmi_get_hw_state(HPWMI_WWAN));
669 err = rfkill_register(wwan_rfkill);
671 goto register_wwan_err;
676 rfkill_destroy(wwan_rfkill);
678 if (bluetooth_rfkill)
679 rfkill_unregister(bluetooth_rfkill);
680 register_bluetooth_error:
681 rfkill_destroy(bluetooth_rfkill);
682 bluetooth_rfkill = NULL;
684 rfkill_unregister(wifi_rfkill);
686 rfkill_destroy(wifi_rfkill);
691 static int __devinit hp_wmi_rfkill2_setup(struct platform_device *device)
694 struct bios_rfkill2_state state;
695 err = hp_wmi_perform_query(HPWMI_WIRELESS2_QUERY, 0, &state,
700 if (state.count > HPWMI_MAX_RFKILL2_DEVICES) {
701 pr_warn("unable to parse 0x1b query output\n");
705 for (i = 0; i < state.count; i++) {
706 struct rfkill *rfkill;
707 enum rfkill_type type;
709 switch (state.device[i].radio_type) {
711 type = RFKILL_TYPE_WLAN;
714 case HPWMI_BLUETOOTH:
715 type = RFKILL_TYPE_BLUETOOTH;
716 name = "hp-bluetooth";
719 type = RFKILL_TYPE_WWAN;
723 pr_warn("unknown device type 0x%x\n",
724 state.device[i].radio_type);
728 if (!state.device[i].vendor_id) {
729 pr_warn("zero device %d while %d reported\n",
734 rfkill = rfkill_alloc(name, &device->dev, type,
735 &hp_wmi_rfkill2_ops, (void *)(long)i);
741 rfkill2[rfkill2_count].id = state.device[i].rfkill_id;
742 rfkill2[rfkill2_count].num = i;
743 rfkill2[rfkill2_count].rfkill = rfkill;
745 rfkill_init_sw_state(rfkill,
746 IS_SWBLOCKED(state.device[i].power));
747 rfkill_set_hw_state(rfkill,
748 IS_HWBLOCKED(state.device[i].power));
750 if (!(state.device[i].power & HPWMI_POWER_BIOS))
751 pr_info("device %s blocked by BIOS\n", name);
753 err = rfkill_register(rfkill);
755 rfkill_destroy(rfkill);
764 for (; rfkill2_count > 0; rfkill2_count--) {
765 rfkill_unregister(rfkill2[rfkill2_count - 1].rfkill);
766 rfkill_destroy(rfkill2[rfkill2_count - 1].rfkill);
771 static int __devinit hp_wmi_bios_setup(struct platform_device *device)
775 /* clear detected rfkill devices */
777 bluetooth_rfkill = NULL;
781 if (hp_wmi_rfkill_setup(device))
782 hp_wmi_rfkill2_setup(device);
784 err = device_create_file(&device->dev, &dev_attr_display);
786 goto add_sysfs_error;
787 err = device_create_file(&device->dev, &dev_attr_hddtemp);
789 goto add_sysfs_error;
790 err = device_create_file(&device->dev, &dev_attr_als);
792 goto add_sysfs_error;
793 err = device_create_file(&device->dev, &dev_attr_dock);
795 goto add_sysfs_error;
796 err = device_create_file(&device->dev, &dev_attr_tablet);
798 goto add_sysfs_error;
802 cleanup_sysfs(device);
806 static int __exit hp_wmi_bios_remove(struct platform_device *device)
809 cleanup_sysfs(device);
811 for (i = 0; i < rfkill2_count; i++) {
812 rfkill_unregister(rfkill2[i].rfkill);
813 rfkill_destroy(rfkill2[i].rfkill);
817 rfkill_unregister(wifi_rfkill);
818 rfkill_destroy(wifi_rfkill);
820 if (bluetooth_rfkill) {
821 rfkill_unregister(bluetooth_rfkill);
822 rfkill_destroy(bluetooth_rfkill);
825 rfkill_unregister(wwan_rfkill);
826 rfkill_destroy(wwan_rfkill);
832 static int hp_wmi_resume_handler(struct device *device)
835 * Hardware state may have changed while suspended, so trigger
836 * input events for the current state. As this is a switch,
837 * the input layer will only actually pass it on if the state
840 if (hp_wmi_input_dev) {
841 input_report_switch(hp_wmi_input_dev, SW_DOCK,
842 hp_wmi_dock_state());
843 input_report_switch(hp_wmi_input_dev, SW_TABLET_MODE,
844 hp_wmi_tablet_state());
845 input_sync(hp_wmi_input_dev);
849 hp_wmi_rfkill2_refresh();
852 rfkill_set_states(wifi_rfkill,
853 hp_wmi_get_sw_state(HPWMI_WIFI),
854 hp_wmi_get_hw_state(HPWMI_WIFI));
855 if (bluetooth_rfkill)
856 rfkill_set_states(bluetooth_rfkill,
857 hp_wmi_get_sw_state(HPWMI_BLUETOOTH),
858 hp_wmi_get_hw_state(HPWMI_BLUETOOTH));
860 rfkill_set_states(wwan_rfkill,
861 hp_wmi_get_sw_state(HPWMI_WWAN),
862 hp_wmi_get_hw_state(HPWMI_WWAN));
867 static int __init hp_wmi_init(void)
870 int event_capable = wmi_has_guid(HPWMI_EVENT_GUID);
871 int bios_capable = wmi_has_guid(HPWMI_BIOS_GUID);
874 err = hp_wmi_input_setup();
880 err = platform_driver_register(&hp_wmi_driver);
883 hp_wmi_platform_dev = platform_device_alloc("hp-wmi", -1);
884 if (!hp_wmi_platform_dev) {
886 goto err_device_alloc;
888 err = platform_device_add(hp_wmi_platform_dev);
893 if (!bios_capable && !event_capable)
899 platform_device_put(hp_wmi_platform_dev);
901 platform_driver_unregister(&hp_wmi_driver);
904 hp_wmi_input_destroy();
909 static void __exit hp_wmi_exit(void)
911 if (wmi_has_guid(HPWMI_EVENT_GUID))
912 hp_wmi_input_destroy();
914 if (hp_wmi_platform_dev) {
915 platform_device_unregister(hp_wmi_platform_dev);
916 platform_driver_unregister(&hp_wmi_driver);
920 module_init(hp_wmi_init);
921 module_exit(hp_wmi_exit);