Root/drivers/acpi/video.c

1/*
2 * video.c - ACPI Video Driver ($Revision:$)
3 *
4 * Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
5 * Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
6 * Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
7 *
8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or (at
13 * your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License along
21 * with this program; if not, write to the Free Software Foundation, Inc.,
22 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
23 *
24 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
25 */
26
27#include <linux/kernel.h>
28#include <linux/module.h>
29#include <linux/init.h>
30#include <linux/types.h>
31#include <linux/list.h>
32#include <linux/mutex.h>
33#include <linux/input.h>
34#include <linux/backlight.h>
35#include <linux/thermal.h>
36#include <linux/sort.h>
37#include <linux/pci.h>
38#include <linux/pci_ids.h>
39#include <linux/slab.h>
40#include <asm/uaccess.h>
41#include <linux/dmi.h>
42#include <acpi/acpi_bus.h>
43#include <acpi/acpi_drivers.h>
44#include <linux/suspend.h>
45#include <acpi/video.h>
46
47#define PREFIX "ACPI: "
48
49#define ACPI_VIDEO_BUS_NAME "Video Bus"
50#define ACPI_VIDEO_DEVICE_NAME "Video Device"
51#define ACPI_VIDEO_NOTIFY_SWITCH 0x80
52#define ACPI_VIDEO_NOTIFY_PROBE 0x81
53#define ACPI_VIDEO_NOTIFY_CYCLE 0x82
54#define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT 0x83
55#define ACPI_VIDEO_NOTIFY_PREV_OUTPUT 0x84
56
57#define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS 0x85
58#define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS 0x86
59#define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS 0x87
60#define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS 0x88
61#define ACPI_VIDEO_NOTIFY_DISPLAY_OFF 0x89
62
63#define MAX_NAME_LEN 20
64
65#define _COMPONENT ACPI_VIDEO_COMPONENT
66ACPI_MODULE_NAME("video");
67
68MODULE_AUTHOR("Bruno Ducrot");
69MODULE_DESCRIPTION("ACPI Video Driver");
70MODULE_LICENSE("GPL");
71
72static bool brightness_switch_enabled = 1;
73module_param(brightness_switch_enabled, bool, 0644);
74
75/*
76 * By default, we don't allow duplicate ACPI video bus devices
77 * under the same VGA controller
78 */
79static bool allow_duplicates;
80module_param(allow_duplicates, bool, 0644);
81
82/*
83 * Some BIOSes claim they use minimum backlight at boot,
84 * and this may bring dimming screen after boot
85 */
86static bool use_bios_initial_backlight = 1;
87module_param(use_bios_initial_backlight, bool, 0644);
88
89static int register_count = 0;
90static int acpi_video_bus_add(struct acpi_device *device);
91static int acpi_video_bus_remove(struct acpi_device *device, int type);
92static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
93
94static const struct acpi_device_id video_device_ids[] = {
95    {ACPI_VIDEO_HID, 0},
96    {"", 0},
97};
98MODULE_DEVICE_TABLE(acpi, video_device_ids);
99
100static struct acpi_driver acpi_video_bus = {
101    .name = "video",
102    .class = ACPI_VIDEO_CLASS,
103    .ids = video_device_ids,
104    .ops = {
105        .add = acpi_video_bus_add,
106        .remove = acpi_video_bus_remove,
107        .notify = acpi_video_bus_notify,
108        },
109};
110
111struct acpi_video_bus_flags {
112    u8 multihead:1; /* can switch video heads */
113    u8 rom:1; /* can retrieve a video rom */
114    u8 post:1; /* can configure the head to */
115    u8 reserved:5;
116};
117
118struct acpi_video_bus_cap {
119    u8 _DOS:1; /*Enable/Disable output switching */
120    u8 _DOD:1; /*Enumerate all devices attached to display adapter */
121    u8 _ROM:1; /*Get ROM Data */
122    u8 _GPD:1; /*Get POST Device */
123    u8 _SPD:1; /*Set POST Device */
124    u8 _VPO:1; /*Video POST Options */
125    u8 reserved:2;
126};
127
128struct acpi_video_device_attrib {
129    u32 display_index:4; /* A zero-based instance of the Display */
130    u32 display_port_attachment:4; /*This field differentiates the display type */
131    u32 display_type:4; /*Describe the specific type in use */
132    u32 vendor_specific:4; /*Chipset Vendor Specific */
133    u32 bios_can_detect:1; /*BIOS can detect the device */
134    u32 depend_on_vga:1; /*Non-VGA output device whose power is related to
135                   the VGA device. */
136    u32 pipe_id:3; /*For VGA multiple-head devices. */
137    u32 reserved:10; /*Must be 0 */
138    u32 device_id_scheme:1; /*Device ID Scheme */
139};
140
141struct acpi_video_enumerated_device {
142    union {
143        u32 int_val;
144        struct acpi_video_device_attrib attrib;
145    } value;
146    struct acpi_video_device *bind_info;
147};
148
149struct acpi_video_bus {
150    struct acpi_device *device;
151    u8 dos_setting;
152    struct acpi_video_enumerated_device *attached_array;
153    u8 attached_count;
154    struct acpi_video_bus_cap cap;
155    struct acpi_video_bus_flags flags;
156    struct list_head video_device_list;
157    struct mutex device_list_lock; /* protects video_device_list */
158    struct input_dev *input;
159    char phys[32]; /* for input device */
160    struct notifier_block pm_nb;
161};
162
163struct acpi_video_device_flags {
164    u8 crt:1;
165    u8 lcd:1;
166    u8 tvout:1;
167    u8 dvi:1;
168    u8 bios:1;
169    u8 unknown:1;
170    u8 reserved:2;
171};
172
173struct acpi_video_device_cap {
174    u8 _ADR:1; /*Return the unique ID */
175    u8 _BCL:1; /*Query list of brightness control levels supported */
176    u8 _BCM:1; /*Set the brightness level */
177    u8 _BQC:1; /* Get current brightness level */
178    u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
179    u8 _DDC:1; /*Return the EDID for this device */
180};
181
182struct acpi_video_brightness_flags {
183    u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
184    u8 _BCL_reversed:1; /* _BCL package is in a reversed order*/
185    u8 _BCL_use_index:1; /* levels in _BCL are index values */
186    u8 _BCM_use_index:1; /* input of _BCM is an index value */
187    u8 _BQC_use_index:1; /* _BQC returns an index value */
188};
189
190struct acpi_video_device_brightness {
191    int curr;
192    int count;
193    int *levels;
194    struct acpi_video_brightness_flags flags;
195};
196
197struct acpi_video_device {
198    unsigned long device_id;
199    struct acpi_video_device_flags flags;
200    struct acpi_video_device_cap cap;
201    struct list_head entry;
202    struct acpi_video_bus *video;
203    struct acpi_device *dev;
204    struct acpi_video_device_brightness *brightness;
205    struct backlight_device *backlight;
206    struct thermal_cooling_device *cooling_dev;
207};
208
209static const char device_decode[][30] = {
210    "motherboard VGA device",
211    "PCI VGA device",
212    "AGP VGA device",
213    "UNKNOWN",
214};
215
216static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
217static void acpi_video_device_rebind(struct acpi_video_bus *video);
218static void acpi_video_device_bind(struct acpi_video_bus *video,
219                   struct acpi_video_device *device);
220static int acpi_video_device_enumerate(struct acpi_video_bus *video);
221static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
222            int level);
223static int acpi_video_device_lcd_get_level_current(
224            struct acpi_video_device *device,
225            unsigned long long *level, int init);
226static int acpi_video_get_next_level(struct acpi_video_device *device,
227                     u32 level_current, u32 event);
228static int acpi_video_switch_brightness(struct acpi_video_device *device,
229                     int event);
230
231/*backlight device sysfs support*/
232static int acpi_video_get_brightness(struct backlight_device *bd)
233{
234    unsigned long long cur_level;
235    int i;
236    struct acpi_video_device *vd =
237        (struct acpi_video_device *)bl_get_data(bd);
238
239    if (acpi_video_device_lcd_get_level_current(vd, &cur_level, 0))
240        return -EINVAL;
241    for (i = 2; i < vd->brightness->count; i++) {
242        if (vd->brightness->levels[i] == cur_level)
243            /* The first two entries are special - see page 575
244               of the ACPI spec 3.0 */
245            return i-2;
246    }
247    return 0;
248}
249
250static int acpi_video_set_brightness(struct backlight_device *bd)
251{
252    int request_level = bd->props.brightness + 2;
253    struct acpi_video_device *vd =
254        (struct acpi_video_device *)bl_get_data(bd);
255
256    return acpi_video_device_lcd_set_level(vd,
257                vd->brightness->levels[request_level]);
258}
259
260static const struct backlight_ops acpi_backlight_ops = {
261    .get_brightness = acpi_video_get_brightness,
262    .update_status = acpi_video_set_brightness,
263};
264
265/* thermal cooling device callbacks */
266static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
267                   long *state)
268{
269    struct acpi_device *device = cooling_dev->devdata;
270    struct acpi_video_device *video = acpi_driver_data(device);
271
272    *state = video->brightness->count - 3;
273    return 0;
274}
275
276static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
277                   long *state)
278{
279    struct acpi_device *device = cooling_dev->devdata;
280    struct acpi_video_device *video = acpi_driver_data(device);
281    unsigned long long level;
282    int offset;
283
284    if (acpi_video_device_lcd_get_level_current(video, &level, 0))
285        return -EINVAL;
286    for (offset = 2; offset < video->brightness->count; offset++)
287        if (level == video->brightness->levels[offset]) {
288            *state = video->brightness->count - offset - 1;
289            return 0;
290        }
291
292    return -EINVAL;
293}
294
295static int
296video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
297{
298    struct acpi_device *device = cooling_dev->devdata;
299    struct acpi_video_device *video = acpi_driver_data(device);
300    int level;
301
302    if ( state >= video->brightness->count - 2)
303        return -EINVAL;
304
305    state = video->brightness->count - state;
306    level = video->brightness->levels[state -1];
307    return acpi_video_device_lcd_set_level(video, level);
308}
309
310static const struct thermal_cooling_device_ops video_cooling_ops = {
311    .get_max_state = video_get_max_state,
312    .get_cur_state = video_get_cur_state,
313    .set_cur_state = video_set_cur_state,
314};
315
316/* --------------------------------------------------------------------------
317                               Video Management
318   -------------------------------------------------------------------------- */
319
320static int
321acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
322                   union acpi_object **levels)
323{
324    int status;
325    struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
326    union acpi_object *obj;
327
328
329    *levels = NULL;
330
331    status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
332    if (!ACPI_SUCCESS(status))
333        return status;
334    obj = (union acpi_object *)buffer.pointer;
335    if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
336        printk(KERN_ERR PREFIX "Invalid _BCL data\n");
337        status = -EFAULT;
338        goto err;
339    }
340
341    *levels = obj;
342
343    return 0;
344
345      err:
346    kfree(buffer.pointer);
347
348    return status;
349}
350
351static int
352acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
353{
354    int status;
355    union acpi_object arg0 = { ACPI_TYPE_INTEGER };
356    struct acpi_object_list args = { 1, &arg0 };
357    int state;
358
359    arg0.integer.value = level;
360
361    status = acpi_evaluate_object(device->dev->handle, "_BCM",
362                      &args, NULL);
363    if (ACPI_FAILURE(status)) {
364        ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
365        return -EIO;
366    }
367
368    device->brightness->curr = level;
369    for (state = 2; state < device->brightness->count; state++)
370        if (level == device->brightness->levels[state]) {
371            if (device->backlight)
372                device->backlight->props.brightness = state - 2;
373            return 0;
374        }
375
376    ACPI_ERROR((AE_INFO, "Current brightness invalid"));
377    return -EINVAL;
378}
379
380/*
381 * For some buggy _BQC methods, we need to add a constant value to
382 * the _BQC return value to get the actual current brightness level
383 */
384
385static int bqc_offset_aml_bug_workaround;
386static int __init video_set_bqc_offset(const struct dmi_system_id *d)
387{
388    bqc_offset_aml_bug_workaround = 9;
389    return 0;
390}
391
392static struct dmi_system_id video_dmi_table[] __initdata = {
393    /*
394     * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
395     */
396    {
397     .callback = video_set_bqc_offset,
398     .ident = "Acer Aspire 5720",
399     .matches = {
400        DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
401        DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
402        },
403    },
404    {
405     .callback = video_set_bqc_offset,
406     .ident = "Acer Aspire 5710Z",
407     .matches = {
408        DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
409        DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
410        },
411    },
412    {
413     .callback = video_set_bqc_offset,
414     .ident = "eMachines E510",
415     .matches = {
416        DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
417        DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
418        },
419    },
420    {
421     .callback = video_set_bqc_offset,
422     .ident = "Acer Aspire 5315",
423     .matches = {
424        DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
425        DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
426        },
427    },
428    {
429     .callback = video_set_bqc_offset,
430     .ident = "Acer Aspire 7720",
431     .matches = {
432        DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
433        DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
434        },
435    },
436    {}
437};
438
439static int
440acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
441                    unsigned long long *level, int init)
442{
443    acpi_status status = AE_OK;
444    int i;
445
446    if (device->cap._BQC || device->cap._BCQ) {
447        char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
448
449        status = acpi_evaluate_integer(device->dev->handle, buf,
450                        NULL, level);
451        if (ACPI_SUCCESS(status)) {
452            if (device->brightness->flags._BQC_use_index) {
453                if (device->brightness->flags._BCL_reversed)
454                    *level = device->brightness->count
455                                 - 3 - (*level);
456                *level = device->brightness->levels[*level + 2];
457
458            }
459            *level += bqc_offset_aml_bug_workaround;
460            for (i = 2; i < device->brightness->count; i++)
461                if (device->brightness->levels[i] == *level) {
462                    device->brightness->curr = *level;
463                    return 0;
464            }
465            if (!init) {
466                /*
467                 * BQC returned an invalid level.
468                 * Stop using it.
469                 */
470                ACPI_WARNING((AE_INFO,
471                          "%s returned an invalid level",
472                          buf));
473                device->cap._BQC = device->cap._BCQ = 0;
474            }
475        } else {
476            /* Fixme:
477             * should we return an error or ignore this failure?
478             * dev->brightness->curr is a cached value which stores
479             * the correct current backlight level in most cases.
480             * ACPI video backlight still works w/ buggy _BQC.
481             * http://bugzilla.kernel.org/show_bug.cgi?id=12233
482             */
483            ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
484            device->cap._BQC = device->cap._BCQ = 0;
485        }
486    }
487
488    *level = device->brightness->curr;
489    return 0;
490}
491
492static int
493acpi_video_device_EDID(struct acpi_video_device *device,
494               union acpi_object **edid, ssize_t length)
495{
496    int status;
497    struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
498    union acpi_object *obj;
499    union acpi_object arg0 = { ACPI_TYPE_INTEGER };
500    struct acpi_object_list args = { 1, &arg0 };
501
502
503    *edid = NULL;
504
505    if (!device)
506        return -ENODEV;
507    if (length == 128)
508        arg0.integer.value = 1;
509    else if (length == 256)
510        arg0.integer.value = 2;
511    else
512        return -EINVAL;
513
514    status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
515    if (ACPI_FAILURE(status))
516        return -ENODEV;
517
518    obj = buffer.pointer;
519
520    if (obj && obj->type == ACPI_TYPE_BUFFER)
521        *edid = obj;
522    else {
523        printk(KERN_ERR PREFIX "Invalid _DDC data\n");
524        status = -EFAULT;
525        kfree(obj);
526    }
527
528    return status;
529}
530
531/* bus */
532
533/*
534 * Arg:
535 * video : video bus device pointer
536 * bios_flag :
537 * 0. The system BIOS should NOT automatically switch(toggle)
538 * the active display output.
539 * 1. The system BIOS should automatically switch (toggle) the
540 * active display output. No switch event.
541 * 2. The _DGS value should be locked.
542 * 3. The system BIOS should not automatically switch (toggle) the
543 * active display output, but instead generate the display switch
544 * event notify code.
545 * lcd_flag :
546 * 0. The system BIOS should automatically control the brightness level
547 * of the LCD when the power changes from AC to DC
548 * 1. The system BIOS should NOT automatically control the brightness
549 * level of the LCD when the power changes from AC to DC.
550 * Return Value:
551 * -EINVAL wrong arg.
552 */
553
554static int
555acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
556{
557    acpi_status status;
558    union acpi_object arg0 = { ACPI_TYPE_INTEGER };
559    struct acpi_object_list args = { 1, &arg0 };
560
561    if (!video->cap._DOS)
562        return 0;
563
564    if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
565        return -EINVAL;
566    arg0.integer.value = (lcd_flag << 2) | bios_flag;
567    video->dos_setting = arg0.integer.value;
568    status = acpi_evaluate_object(video->device->handle, "_DOS",
569        &args, NULL);
570    if (ACPI_FAILURE(status))
571        return -EIO;
572
573    return 0;
574}
575
576/*
577 * Simple comparison function used to sort backlight levels.
578 */
579
580static int
581acpi_video_cmp_level(const void *a, const void *b)
582{
583    return *(int *)a - *(int *)b;
584}
585
586/*
587 * Arg:
588 * device : video output device (LCD, CRT, ..)
589 *
590 * Return Value:
591 * Maximum brightness level
592 *
593 * Allocate and initialize device->brightness.
594 */
595
596static int
597acpi_video_init_brightness(struct acpi_video_device *device)
598{
599    union acpi_object *obj = NULL;
600    int i, max_level = 0, count = 0, level_ac_battery = 0;
601    unsigned long long level, level_old;
602    union acpi_object *o;
603    struct acpi_video_device_brightness *br = NULL;
604    int result = -EINVAL;
605
606    if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
607        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
608                        "LCD brightness level\n"));
609        goto out;
610    }
611
612    if (obj->package.count < 2)
613        goto out;
614
615    br = kzalloc(sizeof(*br), GFP_KERNEL);
616    if (!br) {
617        printk(KERN_ERR "can't allocate memory\n");
618        result = -ENOMEM;
619        goto out;
620    }
621
622    br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
623                GFP_KERNEL);
624    if (!br->levels) {
625        result = -ENOMEM;
626        goto out_free;
627    }
628
629    for (i = 0; i < obj->package.count; i++) {
630        o = (union acpi_object *)&obj->package.elements[i];
631        if (o->type != ACPI_TYPE_INTEGER) {
632            printk(KERN_ERR PREFIX "Invalid data\n");
633            continue;
634        }
635        br->levels[count] = (u32) o->integer.value;
636
637        if (br->levels[count] > max_level)
638            max_level = br->levels[count];
639        count++;
640    }
641
642    /*
643     * some buggy BIOS don't export the levels
644     * when machine is on AC/Battery in _BCL package.
645     * In this case, the first two elements in _BCL packages
646     * are also supported brightness levels that OS should take care of.
647     */
648    for (i = 2; i < count; i++) {
649        if (br->levels[i] == br->levels[0])
650            level_ac_battery++;
651        if (br->levels[i] == br->levels[1])
652            level_ac_battery++;
653    }
654
655    if (level_ac_battery < 2) {
656        level_ac_battery = 2 - level_ac_battery;
657        br->flags._BCL_no_ac_battery_levels = 1;
658        for (i = (count - 1 + level_ac_battery); i >= 2; i--)
659            br->levels[i] = br->levels[i - level_ac_battery];
660        count += level_ac_battery;
661    } else if (level_ac_battery > 2)
662        ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package\n"));
663
664    /* Check if the _BCL package is in a reversed order */
665    if (max_level == br->levels[2]) {
666        br->flags._BCL_reversed = 1;
667        sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
668            acpi_video_cmp_level, NULL);
669    } else if (max_level != br->levels[count - 1])
670        ACPI_ERROR((AE_INFO,
671                "Found unordered _BCL package\n"));
672
673    br->count = count;
674    device->brightness = br;
675
676    /* Check the input/output of _BQC/_BCL/_BCM */
677    if ((max_level < 100) && (max_level <= (count - 2)))
678        br->flags._BCL_use_index = 1;
679
680    /*
681     * _BCM is always consistent with _BCL,
682     * at least for all the laptops we have ever seen.
683     */
684    br->flags._BCM_use_index = br->flags._BCL_use_index;
685
686    /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
687    br->curr = level = max_level;
688
689    if (!device->cap._BQC)
690        goto set_level;
691
692    result = acpi_video_device_lcd_get_level_current(device, &level_old, 1);
693    if (result)
694        goto out_free_levels;
695
696    /*
697     * Set the level to maximum and check if _BQC uses indexed value
698     */
699    result = acpi_video_device_lcd_set_level(device, max_level);
700    if (result)
701        goto out_free_levels;
702
703    result = acpi_video_device_lcd_get_level_current(device, &level, 0);
704    if (result)
705        goto out_free_levels;
706
707    br->flags._BQC_use_index = (level == max_level ? 0 : 1);
708
709    if (!br->flags._BQC_use_index) {
710        /*
711         * Set the backlight to the initial state.
712         * On some buggy laptops, _BQC returns an uninitialized value
713         * when invoked for the first time, i.e. level_old is invalid.
714         * set the backlight to max_level in this case
715         */
716        if (use_bios_initial_backlight) {
717            for (i = 2; i < br->count; i++)
718                if (level_old == br->levels[i])
719                    level = level_old;
720        }
721        goto set_level;
722    }
723
724    if (br->flags._BCL_reversed)
725        level_old = (br->count - 1) - level_old;
726    level = br->levels[level_old];
727
728set_level:
729    result = acpi_video_device_lcd_set_level(device, level);
730    if (result)
731        goto out_free_levels;
732
733    ACPI_DEBUG_PRINT((ACPI_DB_INFO,
734              "found %d brightness levels\n", count - 2));
735    kfree(obj);
736    return result;
737
738out_free_levels:
739    kfree(br->levels);
740out_free:
741    kfree(br);
742out:
743    device->brightness = NULL;
744    kfree(obj);
745    return result;
746}
747
748/*
749 * Arg:
750 * device : video output device (LCD, CRT, ..)
751 *
752 * Return Value:
753 * None
754 *
755 * Find out all required AML methods defined under the output
756 * device.
757 */
758
759static void acpi_video_device_find_cap(struct acpi_video_device *device)
760{
761    acpi_handle h_dummy1;
762
763    if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
764        device->cap._ADR = 1;
765    }
766    if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
767        device->cap._BCL = 1;
768    }
769    if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
770        device->cap._BCM = 1;
771    }
772    if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
773        device->cap._BQC = 1;
774    else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
775                &h_dummy1))) {
776        printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
777        device->cap._BCQ = 1;
778    }
779
780    if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
781        device->cap._DDC = 1;
782    }
783
784    if (acpi_video_backlight_support()) {
785        struct backlight_properties props;
786        struct pci_dev *pdev;
787        acpi_handle acpi_parent;
788        struct device *parent = NULL;
789        int result;
790        static int count = 0;
791        char *name;
792
793        result = acpi_video_init_brightness(device);
794        if (result)
795            return;
796        name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
797        if (!name)
798            return;
799        count++;
800
801        acpi_get_parent(device->dev->handle, &acpi_parent);
802
803        pdev = acpi_get_pci_dev(acpi_parent);
804        if (pdev) {
805            parent = &pdev->dev;
806            pci_dev_put(pdev);
807        }
808
809        memset(&props, 0, sizeof(struct backlight_properties));
810        props.type = BACKLIGHT_FIRMWARE;
811        props.max_brightness = device->brightness->count - 3;
812        device->backlight = backlight_device_register(name,
813                                  parent,
814                                  device,
815                                  &acpi_backlight_ops,
816                                  &props);
817        kfree(name);
818        if (IS_ERR(device->backlight))
819            return;
820
821        /*
822         * Save current brightness level in case we have to restore it
823         * before acpi_video_device_lcd_set_level() is called next time.
824         */
825        device->backlight->props.brightness =
826                acpi_video_get_brightness(device->backlight);
827
828        device->cooling_dev = thermal_cooling_device_register("LCD",
829                    device->dev, &video_cooling_ops);
830        if (IS_ERR(device->cooling_dev)) {
831            /*
832             * Set cooling_dev to NULL so we don't crash trying to
833             * free it.
834             * Also, why the hell we are returning early and
835             * not attempt to register video output if cooling
836             * device registration failed?
837             * -- dtor
838             */
839            device->cooling_dev = NULL;
840            return;
841        }
842
843        dev_info(&device->dev->dev, "registered as cooling_device%d\n",
844             device->cooling_dev->id);
845        result = sysfs_create_link(&device->dev->dev.kobj,
846                &device->cooling_dev->device.kobj,
847                "thermal_cooling");
848        if (result)
849            printk(KERN_ERR PREFIX "Create sysfs link\n");
850        result = sysfs_create_link(&device->cooling_dev->device.kobj,
851                &device->dev->dev.kobj, "device");
852        if (result)
853            printk(KERN_ERR PREFIX "Create sysfs link\n");
854
855    }
856}
857
858/*
859 * Arg:
860 * device : video output device (VGA)
861 *
862 * Return Value:
863 * None
864 *
865 * Find out all required AML methods defined under the video bus device.
866 */
867
868static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
869{
870    acpi_handle h_dummy1;
871
872    if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
873        video->cap._DOS = 1;
874    }
875    if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
876        video->cap._DOD = 1;
877    }
878    if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
879        video->cap._ROM = 1;
880    }
881    if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
882        video->cap._GPD = 1;
883    }
884    if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
885        video->cap._SPD = 1;
886    }
887    if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
888        video->cap._VPO = 1;
889    }
890}
891
892/*
893 * Check whether the video bus device has required AML method to
894 * support the desired features
895 */
896
897static int acpi_video_bus_check(struct acpi_video_bus *video)
898{
899    acpi_status status = -ENOENT;
900    struct pci_dev *dev;
901
902    if (!video)
903        return -EINVAL;
904
905    dev = acpi_get_pci_dev(video->device->handle);
906    if (!dev)
907        return -ENODEV;
908    pci_dev_put(dev);
909
910    /* Since there is no HID, CID and so on for VGA driver, we have
911     * to check well known required nodes.
912     */
913
914    /* Does this device support video switching? */
915    if (video->cap._DOS || video->cap._DOD) {
916        if (!video->cap._DOS) {
917            printk(KERN_WARNING FW_BUG
918                "ACPI(%s) defines _DOD but not _DOS\n",
919                acpi_device_bid(video->device));
920        }
921        video->flags.multihead = 1;
922        status = 0;
923    }
924
925    /* Does this device support retrieving a video ROM? */
926    if (video->cap._ROM) {
927        video->flags.rom = 1;
928        status = 0;
929    }
930
931    /* Does this device support configuring which video device to POST? */
932    if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
933        video->flags.post = 1;
934        status = 0;
935    }
936
937    return status;
938}
939
940/* --------------------------------------------------------------------------
941                                 Driver Interface
942   -------------------------------------------------------------------------- */
943
944/* device interface */
945static struct acpi_video_device_attrib*
946acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
947{
948    struct acpi_video_enumerated_device *ids;
949    int i;
950
951    for (i = 0; i < video->attached_count; i++) {
952        ids = &video->attached_array[i];
953        if ((ids->value.int_val & 0xffff) == device_id)
954            return &ids->value.attrib;
955    }
956
957    return NULL;
958}
959
960static int
961acpi_video_get_device_type(struct acpi_video_bus *video,
962               unsigned long device_id)
963{
964    struct acpi_video_enumerated_device *ids;
965    int i;
966
967    for (i = 0; i < video->attached_count; i++) {
968        ids = &video->attached_array[i];
969        if ((ids->value.int_val & 0xffff) == device_id)
970            return ids->value.int_val;
971    }
972
973    return 0;
974}
975
976static int
977acpi_video_bus_get_one_device(struct acpi_device *device,
978                  struct acpi_video_bus *video)
979{
980    unsigned long long device_id;
981    int status, device_type;
982    struct acpi_video_device *data;
983    struct acpi_video_device_attrib* attribute;
984
985    if (!device || !video)
986        return -EINVAL;
987
988    status =
989        acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
990    if (ACPI_SUCCESS(status)) {
991
992        data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
993        if (!data)
994            return -ENOMEM;
995
996        strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
997        strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
998        device->driver_data = data;
999
1000        data->device_id = device_id;
1001        data->video = video;
1002        data->dev = device;
1003
1004        attribute = acpi_video_get_device_attr(video, device_id);
1005
1006        if((attribute != NULL) && attribute->device_id_scheme) {
1007            switch (attribute->display_type) {
1008            case ACPI_VIDEO_DISPLAY_CRT:
1009                data->flags.crt = 1;
1010                break;
1011            case ACPI_VIDEO_DISPLAY_TV:
1012                data->flags.tvout = 1;
1013                break;
1014            case ACPI_VIDEO_DISPLAY_DVI:
1015                data->flags.dvi = 1;
1016                break;
1017            case ACPI_VIDEO_DISPLAY_LCD:
1018                data->flags.lcd = 1;
1019                break;
1020            default:
1021                data->flags.unknown = 1;
1022                break;
1023            }
1024            if(attribute->bios_can_detect)
1025                data->flags.bios = 1;
1026        } else {
1027            /* Check for legacy IDs */
1028            device_type = acpi_video_get_device_type(video,
1029                                 device_id);
1030            /* Ignore bits 16 and 18-20 */
1031            switch (device_type & 0xffe2ffff) {
1032            case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1033                data->flags.crt = 1;
1034                break;
1035            case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1036                data->flags.lcd = 1;
1037                break;
1038            case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1039                data->flags.tvout = 1;
1040                break;
1041            default:
1042                data->flags.unknown = 1;
1043            }
1044        }
1045
1046        acpi_video_device_bind(video, data);
1047        acpi_video_device_find_cap(data);
1048
1049        status = acpi_install_notify_handler(device->handle,
1050                             ACPI_DEVICE_NOTIFY,
1051                             acpi_video_device_notify,
1052                             data);
1053        if (ACPI_FAILURE(status)) {
1054            printk(KERN_ERR PREFIX
1055                      "Error installing notify handler\n");
1056            if(data->brightness)
1057                kfree(data->brightness->levels);
1058            kfree(data->brightness);
1059            kfree(data);
1060            return -ENODEV;
1061        }
1062
1063        mutex_lock(&video->device_list_lock);
1064        list_add_tail(&data->entry, &video->video_device_list);
1065        mutex_unlock(&video->device_list_lock);
1066
1067        return 0;
1068    }
1069
1070    return -ENOENT;
1071}
1072
1073/*
1074 * Arg:
1075 * video : video bus device
1076 *
1077 * Return:
1078 * none
1079 *
1080 * Enumerate the video device list of the video bus,
1081 * bind the ids with the corresponding video devices
1082 * under the video bus.
1083 */
1084
1085static void acpi_video_device_rebind(struct acpi_video_bus *video)
1086{
1087    struct acpi_video_device *dev;
1088
1089    mutex_lock(&video->device_list_lock);
1090
1091    list_for_each_entry(dev, &video->video_device_list, entry)
1092        acpi_video_device_bind(video, dev);
1093
1094    mutex_unlock(&video->device_list_lock);
1095}
1096
1097/*
1098 * Arg:
1099 * video : video bus device
1100 * device : video output device under the video
1101 * bus
1102 *
1103 * Return:
1104 * none
1105 *
1106 * Bind the ids with the corresponding video devices
1107 * under the video bus.
1108 */
1109
1110static void
1111acpi_video_device_bind(struct acpi_video_bus *video,
1112               struct acpi_video_device *device)
1113{
1114    struct acpi_video_enumerated_device *ids;
1115    int i;
1116
1117    for (i = 0; i < video->attached_count; i++) {
1118        ids = &video->attached_array[i];
1119        if (device->device_id == (ids->value.int_val & 0xffff)) {
1120            ids->bind_info = device;
1121            ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1122        }
1123    }
1124}
1125
1126/*
1127 * Arg:
1128 * video : video bus device
1129 *
1130 * Return:
1131 * < 0 : error
1132 *
1133 * Call _DOD to enumerate all devices attached to display adapter
1134 *
1135 */
1136
1137static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1138{
1139    int status;
1140    int count;
1141    int i;
1142    struct acpi_video_enumerated_device *active_list;
1143    struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1144    union acpi_object *dod = NULL;
1145    union acpi_object *obj;
1146
1147    status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1148    if (!ACPI_SUCCESS(status)) {
1149        ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1150        return status;
1151    }
1152
1153    dod = buffer.pointer;
1154    if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1155        ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1156        status = -EFAULT;
1157        goto out;
1158    }
1159
1160    ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1161              dod->package.count));
1162
1163    active_list = kcalloc(1 + dod->package.count,
1164                  sizeof(struct acpi_video_enumerated_device),
1165                  GFP_KERNEL);
1166    if (!active_list) {
1167        status = -ENOMEM;
1168        goto out;
1169    }
1170
1171    count = 0;
1172    for (i = 0; i < dod->package.count; i++) {
1173        obj = &dod->package.elements[i];
1174
1175        if (obj->type != ACPI_TYPE_INTEGER) {
1176            printk(KERN_ERR PREFIX
1177                "Invalid _DOD data in element %d\n", i);
1178            continue;
1179        }
1180
1181        active_list[count].value.int_val = obj->integer.value;
1182        active_list[count].bind_info = NULL;
1183        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1184                  (int)obj->integer.value));
1185        count++;
1186    }
1187
1188    kfree(video->attached_array);
1189
1190    video->attached_array = active_list;
1191    video->attached_count = count;
1192
1193 out:
1194    kfree(buffer.pointer);
1195    return status;
1196}
1197
1198static int
1199acpi_video_get_next_level(struct acpi_video_device *device,
1200              u32 level_current, u32 event)
1201{
1202    int min, max, min_above, max_below, i, l, delta = 255;
1203    max = max_below = 0;
1204    min = min_above = 255;
1205    /* Find closest level to level_current */
1206    for (i = 2; i < device->brightness->count; i++) {
1207        l = device->brightness->levels[i];
1208        if (abs(l - level_current) < abs(delta)) {
1209            delta = l - level_current;
1210            if (!delta)
1211                break;
1212        }
1213    }
1214    /* Ajust level_current to closest available level */
1215    level_current += delta;
1216    for (i = 2; i < device->brightness->count; i++) {
1217        l = device->brightness->levels[i];
1218        if (l < min)
1219            min = l;
1220        if (l > max)
1221            max = l;
1222        if (l < min_above && l > level_current)
1223            min_above = l;
1224        if (l > max_below && l < level_current)
1225            max_below = l;
1226    }
1227
1228    switch (event) {
1229    case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1230        return (level_current < max) ? min_above : min;
1231    case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1232        return (level_current < max) ? min_above : max;
1233    case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1234        return (level_current > min) ? max_below : min;
1235    case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1236    case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1237        return 0;
1238    default:
1239        return level_current;
1240    }
1241}
1242
1243static int
1244acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1245{
1246    unsigned long long level_current, level_next;
1247    int result = -EINVAL;
1248
1249    /* no warning message if acpi_backlight=vendor is used */
1250    if (!acpi_video_backlight_support())
1251        return 0;
1252
1253    if (!device->brightness)
1254        goto out;
1255
1256    result = acpi_video_device_lcd_get_level_current(device,
1257                             &level_current, 0);
1258    if (result)
1259        goto out;
1260
1261    level_next = acpi_video_get_next_level(device, level_current, event);
1262
1263    result = acpi_video_device_lcd_set_level(device, level_next);
1264
1265    if (!result)
1266        backlight_force_update(device->backlight,
1267                       BACKLIGHT_UPDATE_HOTKEY);
1268
1269out:
1270    if (result)
1271        printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1272
1273    return result;
1274}
1275
1276int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1277            void **edid)
1278{
1279    struct acpi_video_bus *video;
1280    struct acpi_video_device *video_device;
1281    union acpi_object *buffer = NULL;
1282    acpi_status status;
1283    int i, length;
1284
1285    if (!device || !acpi_driver_data(device))
1286        return -EINVAL;
1287
1288    video = acpi_driver_data(device);
1289
1290    for (i = 0; i < video->attached_count; i++) {
1291        video_device = video->attached_array[i].bind_info;
1292        length = 256;
1293
1294        if (!video_device)
1295            continue;
1296
1297        if (!video_device->cap._DDC)
1298            continue;
1299
1300        if (type) {
1301            switch (type) {
1302            case ACPI_VIDEO_DISPLAY_CRT:
1303                if (!video_device->flags.crt)
1304                    continue;
1305                break;
1306            case ACPI_VIDEO_DISPLAY_TV:
1307                if (!video_device->flags.tvout)
1308                    continue;
1309                break;
1310            case ACPI_VIDEO_DISPLAY_DVI:
1311                if (!video_device->flags.dvi)
1312                    continue;
1313                break;
1314            case ACPI_VIDEO_DISPLAY_LCD:
1315                if (!video_device->flags.lcd)
1316                    continue;
1317                break;
1318            }
1319        } else if (video_device->device_id != device_id) {
1320            continue;
1321        }
1322
1323        status = acpi_video_device_EDID(video_device, &buffer, length);
1324
1325        if (ACPI_FAILURE(status) || !buffer ||
1326            buffer->type != ACPI_TYPE_BUFFER) {
1327            length = 128;
1328            status = acpi_video_device_EDID(video_device, &buffer,
1329                            length);
1330            if (ACPI_FAILURE(status) || !buffer ||
1331                buffer->type != ACPI_TYPE_BUFFER) {
1332                continue;
1333            }
1334        }
1335
1336        *edid = buffer->buffer.pointer;
1337        return length;
1338    }
1339
1340    return -ENODEV;
1341}
1342EXPORT_SYMBOL(acpi_video_get_edid);
1343
1344static int
1345acpi_video_bus_get_devices(struct acpi_video_bus *video,
1346               struct acpi_device *device)
1347{
1348    int status;
1349    struct acpi_device *dev;
1350
1351    status = acpi_video_device_enumerate(video);
1352    if (status)
1353        return status;
1354
1355    list_for_each_entry(dev, &device->children, node) {
1356
1357        status = acpi_video_bus_get_one_device(dev, video);
1358        if (status) {
1359            printk(KERN_WARNING PREFIX
1360                    "Can't attach device\n");
1361            continue;
1362        }
1363    }
1364    return status;
1365}
1366
1367static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1368{
1369    acpi_status status;
1370
1371    if (!device || !device->video)
1372        return -ENOENT;
1373
1374    status = acpi_remove_notify_handler(device->dev->handle,
1375                        ACPI_DEVICE_NOTIFY,
1376                        acpi_video_device_notify);
1377    if (ACPI_FAILURE(status)) {
1378        printk(KERN_WARNING PREFIX
1379               "Can't remove video notify handler\n");
1380    }
1381    if (device->backlight) {
1382        backlight_device_unregister(device->backlight);
1383        device->backlight = NULL;
1384    }
1385    if (device->cooling_dev) {
1386        sysfs_remove_link(&device->dev->dev.kobj,
1387                  "thermal_cooling");
1388        sysfs_remove_link(&device->cooling_dev->device.kobj,
1389                  "device");
1390        thermal_cooling_device_unregister(device->cooling_dev);
1391        device->cooling_dev = NULL;
1392    }
1393
1394    return 0;
1395}
1396
1397static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1398{
1399    int status;
1400    struct acpi_video_device *dev, *next;
1401
1402    mutex_lock(&video->device_list_lock);
1403
1404    list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1405
1406        status = acpi_video_bus_put_one_device(dev);
1407        if (ACPI_FAILURE(status))
1408            printk(KERN_WARNING PREFIX
1409                   "hhuuhhuu bug in acpi video driver.\n");
1410
1411        if (dev->brightness) {
1412            kfree(dev->brightness->levels);
1413            kfree(dev->brightness);
1414        }
1415        list_del(&dev->entry);
1416        kfree(dev);
1417    }
1418
1419    mutex_unlock(&video->device_list_lock);
1420
1421    return 0;
1422}
1423
1424/* acpi_video interface */
1425
1426static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1427{
1428    return acpi_video_bus_DOS(video, 0, 0);
1429}
1430
1431static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1432{
1433    return acpi_video_bus_DOS(video, 0, 1);
1434}
1435
1436static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1437{
1438    struct acpi_video_bus *video = acpi_driver_data(device);
1439    struct input_dev *input;
1440    int keycode = 0;
1441
1442    if (!video)
1443        return;
1444
1445    input = video->input;
1446
1447    switch (event) {
1448    case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1449                     * most likely via hotkey. */
1450        acpi_bus_generate_proc_event(device, event, 0);
1451        if (!acpi_notifier_call_chain(device, event, 0))
1452            keycode = KEY_SWITCHVIDEOMODE;
1453        break;
1454
1455    case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1456                     * connector. */
1457        acpi_video_device_enumerate(video);
1458        acpi_video_device_rebind(video);
1459        acpi_bus_generate_proc_event(device, event, 0);
1460        keycode = KEY_SWITCHVIDEOMODE;
1461        break;
1462
1463    case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1464        acpi_bus_generate_proc_event(device, event, 0);
1465        keycode = KEY_SWITCHVIDEOMODE;
1466        break;
1467    case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1468        acpi_bus_generate_proc_event(device, event, 0);
1469        keycode = KEY_VIDEO_NEXT;
1470        break;
1471    case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1472        acpi_bus_generate_proc_event(device, event, 0);
1473        keycode = KEY_VIDEO_PREV;
1474        break;
1475
1476    default:
1477        ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1478                  "Unsupported event [0x%x]\n", event));
1479        break;
1480    }
1481
1482    if (event != ACPI_VIDEO_NOTIFY_SWITCH)
1483        acpi_notifier_call_chain(device, event, 0);
1484
1485    if (keycode) {
1486        input_report_key(input, keycode, 1);
1487        input_sync(input);
1488        input_report_key(input, keycode, 0);
1489        input_sync(input);
1490    }
1491
1492    return;
1493}
1494
1495static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1496{
1497    struct acpi_video_device *video_device = data;
1498    struct acpi_device *device = NULL;
1499    struct acpi_video_bus *bus;
1500    struct input_dev *input;
1501    int keycode = 0;
1502
1503    if (!video_device)
1504        return;
1505
1506    device = video_device->dev;
1507    bus = video_device->video;
1508    input = bus->input;
1509
1510    switch (event) {
1511    case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1512        if (brightness_switch_enabled)
1513            acpi_video_switch_brightness(video_device, event);
1514        acpi_bus_generate_proc_event(device, event, 0);
1515        keycode = KEY_BRIGHTNESS_CYCLE;
1516        break;
1517    case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1518        if (brightness_switch_enabled)
1519            acpi_video_switch_brightness(video_device, event);
1520        acpi_bus_generate_proc_event(device, event, 0);
1521        keycode = KEY_BRIGHTNESSUP;
1522        break;
1523    case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1524        if (brightness_switch_enabled)
1525            acpi_video_switch_brightness(video_device, event);
1526        acpi_bus_generate_proc_event(device, event, 0);
1527        keycode = KEY_BRIGHTNESSDOWN;
1528        break;
1529    case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1530        if (brightness_switch_enabled)
1531            acpi_video_switch_brightness(video_device, event);
1532        acpi_bus_generate_proc_event(device, event, 0);
1533        keycode = KEY_BRIGHTNESS_ZERO;
1534        break;
1535    case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1536        if (brightness_switch_enabled)
1537            acpi_video_switch_brightness(video_device, event);
1538        acpi_bus_generate_proc_event(device, event, 0);
1539        keycode = KEY_DISPLAY_OFF;
1540        break;
1541    default:
1542        ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1543                  "Unsupported event [0x%x]\n", event));
1544        break;
1545    }
1546
1547    acpi_notifier_call_chain(device, event, 0);
1548
1549    if (keycode) {
1550        input_report_key(input, keycode, 1);
1551        input_sync(input);
1552        input_report_key(input, keycode, 0);
1553        input_sync(input);
1554    }
1555
1556    return;
1557}
1558
1559static int acpi_video_resume(struct notifier_block *nb,
1560                unsigned long val, void *ign)
1561{
1562    struct acpi_video_bus *video;
1563    struct acpi_video_device *video_device;
1564    int i;
1565
1566    switch (val) {
1567    case PM_HIBERNATION_PREPARE:
1568    case PM_SUSPEND_PREPARE:
1569    case PM_RESTORE_PREPARE:
1570        return NOTIFY_DONE;
1571    }
1572
1573    video = container_of(nb, struct acpi_video_bus, pm_nb);
1574
1575    dev_info(&video->device->dev, "Restoring backlight state\n");
1576
1577    for (i = 0; i < video->attached_count; i++) {
1578        video_device = video->attached_array[i].bind_info;
1579        if (video_device && video_device->backlight)
1580            acpi_video_set_brightness(video_device->backlight);
1581    }
1582
1583    return NOTIFY_OK;
1584}
1585
1586static acpi_status
1587acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1588            void **return_value)
1589{
1590    struct acpi_device *device = context;
1591    struct acpi_device *sibling;
1592    int result;
1593
1594    if (handle == device->handle)
1595        return AE_CTRL_TERMINATE;
1596
1597    result = acpi_bus_get_device(handle, &sibling);
1598    if (result)
1599        return AE_OK;
1600
1601    if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1602            return AE_ALREADY_EXISTS;
1603
1604    return AE_OK;
1605}
1606
1607static int instance;
1608
1609static int acpi_video_bus_add(struct acpi_device *device)
1610{
1611    struct acpi_video_bus *video;
1612    struct input_dev *input;
1613    int error;
1614    acpi_status status;
1615
1616    status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1617                device->parent->handle, 1,
1618                acpi_video_bus_match, NULL,
1619                device, NULL);
1620    if (status == AE_ALREADY_EXISTS) {
1621        printk(KERN_WARNING FW_BUG
1622            "Duplicate ACPI video bus devices for the"
1623            " same VGA controller, please try module "
1624            "parameter \"video.allow_duplicates=1\""
1625            "if the current driver doesn't work.\n");
1626        if (!allow_duplicates)
1627            return -ENODEV;
1628    }
1629
1630    video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1631    if (!video)
1632        return -ENOMEM;
1633
1634    /* a hack to fix the duplicate name "VID" problem on T61 */
1635    if (!strcmp(device->pnp.bus_id, "VID")) {
1636        if (instance)
1637            device->pnp.bus_id[3] = '0' + instance;
1638        instance ++;
1639    }
1640    /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1641    if (!strcmp(device->pnp.bus_id, "VGA")) {
1642        if (instance)
1643            device->pnp.bus_id[3] = '0' + instance;
1644        instance++;
1645    }
1646
1647    video->device = device;
1648    strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1649    strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1650    device->driver_data = video;
1651
1652    acpi_video_bus_find_cap(video);
1653    error = acpi_video_bus_check(video);
1654    if (error)
1655        goto err_free_video;
1656
1657    mutex_init(&video->device_list_lock);
1658    INIT_LIST_HEAD(&video->video_device_list);
1659
1660    error = acpi_video_bus_get_devices(video, device);
1661    if (error)
1662        goto err_free_video;
1663
1664    video->input = input = input_allocate_device();
1665    if (!input) {
1666        error = -ENOMEM;
1667        goto err_put_video;
1668    }
1669
1670    error = acpi_video_bus_start_devices(video);
1671    if (error)
1672        goto err_free_input_dev;
1673
1674    snprintf(video->phys, sizeof(video->phys),
1675        "%s/video/input0", acpi_device_hid(video->device));
1676
1677    input->name = acpi_device_name(video->device);
1678    input->phys = video->phys;
1679    input->id.bustype = BUS_HOST;
1680    input->id.product = 0x06;
1681    input->dev.parent = &device->dev;
1682    input->evbit[0] = BIT(EV_KEY);
1683    set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1684    set_bit(KEY_VIDEO_NEXT, input->keybit);
1685    set_bit(KEY_VIDEO_PREV, input->keybit);
1686    set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1687    set_bit(KEY_BRIGHTNESSUP, input->keybit);
1688    set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1689    set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1690    set_bit(KEY_DISPLAY_OFF, input->keybit);
1691
1692    printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
1693           ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1694           video->flags.multihead ? "yes" : "no",
1695           video->flags.rom ? "yes" : "no",
1696           video->flags.post ? "yes" : "no");
1697
1698    video->pm_nb.notifier_call = acpi_video_resume;
1699    video->pm_nb.priority = 0;
1700    error = register_pm_notifier(&video->pm_nb);
1701    if (error)
1702        goto err_stop_video;
1703
1704    error = input_register_device(input);
1705    if (error)
1706        goto err_unregister_pm_notifier;
1707
1708    return 0;
1709
1710 err_unregister_pm_notifier:
1711    unregister_pm_notifier(&video->pm_nb);
1712 err_stop_video:
1713    acpi_video_bus_stop_devices(video);
1714 err_free_input_dev:
1715    input_free_device(input);
1716 err_put_video:
1717    acpi_video_bus_put_devices(video);
1718    kfree(video->attached_array);
1719 err_free_video:
1720    kfree(video);
1721    device->driver_data = NULL;
1722
1723    return error;
1724}
1725
1726static int acpi_video_bus_remove(struct acpi_device *device, int type)
1727{
1728    struct acpi_video_bus *video = NULL;
1729
1730
1731    if (!device || !acpi_driver_data(device))
1732        return -EINVAL;
1733
1734    video = acpi_driver_data(device);
1735
1736    unregister_pm_notifier(&video->pm_nb);
1737
1738    acpi_video_bus_stop_devices(video);
1739    acpi_video_bus_put_devices(video);
1740
1741    input_unregister_device(video->input);
1742    kfree(video->attached_array);
1743    kfree(video);
1744
1745    return 0;
1746}
1747
1748static int __init is_i740(struct pci_dev *dev)
1749{
1750    if (dev->device == 0x00D1)
1751        return 1;
1752    if (dev->device == 0x7000)
1753        return 1;
1754    return 0;
1755}
1756
1757static int __init intel_opregion_present(void)
1758{
1759    int opregion = 0;
1760    struct pci_dev *dev = NULL;
1761    u32 address;
1762
1763    for_each_pci_dev(dev) {
1764        if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1765            continue;
1766        if (dev->vendor != PCI_VENDOR_ID_INTEL)
1767            continue;
1768        /* We don't want to poke around undefined i740 registers */
1769        if (is_i740(dev))
1770            continue;
1771        pci_read_config_dword(dev, 0xfc, &address);
1772        if (!address)
1773            continue;
1774        opregion = 1;
1775    }
1776    return opregion;
1777}
1778
1779int acpi_video_register(void)
1780{
1781    int result = 0;
1782    if (register_count) {
1783        /*
1784         * if the function of acpi_video_register is already called,
1785         * don't register the acpi_vide_bus again and return no error.
1786         */
1787        return 0;
1788    }
1789
1790    result = acpi_bus_register_driver(&acpi_video_bus);
1791    if (result < 0)
1792        return -ENODEV;
1793
1794    /*
1795     * When the acpi_video_bus is loaded successfully, increase
1796     * the counter reference.
1797     */
1798    register_count = 1;
1799
1800    return 0;
1801}
1802EXPORT_SYMBOL(acpi_video_register);
1803
1804void acpi_video_unregister(void)
1805{
1806    if (!register_count) {
1807        /*
1808         * If the acpi video bus is already unloaded, don't
1809         * unload it again and return directly.
1810         */
1811        return;
1812    }
1813    acpi_bus_unregister_driver(&acpi_video_bus);
1814
1815    register_count = 0;
1816
1817    return;
1818}
1819EXPORT_SYMBOL(acpi_video_unregister);
1820
1821/*
1822 * This is kind of nasty. Hardware using Intel chipsets may require
1823 * the video opregion code to be run first in order to initialise
1824 * state before any ACPI video calls are made. To handle this we defer
1825 * registration of the video class until the opregion code has run.
1826 */
1827
1828static int __init acpi_video_init(void)
1829{
1830    dmi_check_system(video_dmi_table);
1831
1832    if (intel_opregion_present())
1833        return 0;
1834
1835    return acpi_video_register();
1836}
1837
1838static void __exit acpi_video_exit(void)
1839{
1840    acpi_video_unregister();
1841
1842    return;
1843}
1844
1845module_init(acpi_video_init);
1846module_exit(acpi_video_exit);
1847

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