Version:  2.0.40 2.2.26 2.4.37 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1

Linux/drivers/platform/x86/apple-gmux.c

  1 /*
  2  *  Gmux driver for Apple laptops
  3  *
  4  *  Copyright (C) Canonical Ltd. <seth.forshee@canonical.com>
  5  *  Copyright (C) 2010-2012 Andreas Heider <andreas@meetr.de>
  6  *
  7  *  This program is free software; you can redistribute it and/or modify
  8  *  it under the terms of the GNU General Public License version 2 as
  9  *  published by the Free Software Foundation.
 10  */
 11 
 12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 13 
 14 #include <linux/module.h>
 15 #include <linux/kernel.h>
 16 #include <linux/init.h>
 17 #include <linux/backlight.h>
 18 #include <linux/acpi.h>
 19 #include <linux/pnp.h>
 20 #include <linux/apple_bl.h>
 21 #include <linux/slab.h>
 22 #include <linux/delay.h>
 23 #include <linux/pci.h>
 24 #include <linux/vga_switcheroo.h>
 25 #include <linux/vgaarb.h>
 26 #include <acpi/video.h>
 27 #include <asm/io.h>
 28 
 29 struct apple_gmux_data {
 30         unsigned long iostart;
 31         unsigned long iolen;
 32         bool indexed;
 33         struct mutex index_lock;
 34 
 35         struct pci_dev *pdev;
 36         struct backlight_device *bdev;
 37 
 38         /* switcheroo data */
 39         acpi_handle dhandle;
 40         int gpe;
 41         enum vga_switcheroo_client_id resume_client_id;
 42         enum vga_switcheroo_state power_state;
 43         struct completion powerchange_done;
 44 };
 45 
 46 static struct apple_gmux_data *apple_gmux_data;
 47 
 48 /*
 49  * gmux port offsets. Many of these are not yet used, but may be in the
 50  * future, and it's useful to have them documented here anyhow.
 51  */
 52 #define GMUX_PORT_VERSION_MAJOR         0x04
 53 #define GMUX_PORT_VERSION_MINOR         0x05
 54 #define GMUX_PORT_VERSION_RELEASE       0x06
 55 #define GMUX_PORT_SWITCH_DISPLAY        0x10
 56 #define GMUX_PORT_SWITCH_GET_DISPLAY    0x11
 57 #define GMUX_PORT_INTERRUPT_ENABLE      0x14
 58 #define GMUX_PORT_INTERRUPT_STATUS      0x16
 59 #define GMUX_PORT_SWITCH_DDC            0x28
 60 #define GMUX_PORT_SWITCH_EXTERNAL       0x40
 61 #define GMUX_PORT_SWITCH_GET_EXTERNAL   0x41
 62 #define GMUX_PORT_DISCRETE_POWER        0x50
 63 #define GMUX_PORT_MAX_BRIGHTNESS        0x70
 64 #define GMUX_PORT_BRIGHTNESS            0x74
 65 #define GMUX_PORT_VALUE                 0xc2
 66 #define GMUX_PORT_READ                  0xd0
 67 #define GMUX_PORT_WRITE                 0xd4
 68 
 69 #define GMUX_MIN_IO_LEN                 (GMUX_PORT_BRIGHTNESS + 4)
 70 
 71 #define GMUX_INTERRUPT_ENABLE           0xff
 72 #define GMUX_INTERRUPT_DISABLE          0x00
 73 
 74 #define GMUX_INTERRUPT_STATUS_ACTIVE    0
 75 #define GMUX_INTERRUPT_STATUS_DISPLAY   (1 << 0)
 76 #define GMUX_INTERRUPT_STATUS_POWER     (1 << 2)
 77 #define GMUX_INTERRUPT_STATUS_HOTPLUG   (1 << 3)
 78 
 79 #define GMUX_BRIGHTNESS_MASK            0x00ffffff
 80 #define GMUX_MAX_BRIGHTNESS             GMUX_BRIGHTNESS_MASK
 81 
 82 static u8 gmux_pio_read8(struct apple_gmux_data *gmux_data, int port)
 83 {
 84         return inb(gmux_data->iostart + port);
 85 }
 86 
 87 static void gmux_pio_write8(struct apple_gmux_data *gmux_data, int port,
 88                                u8 val)
 89 {
 90         outb(val, gmux_data->iostart + port);
 91 }
 92 
 93 static u32 gmux_pio_read32(struct apple_gmux_data *gmux_data, int port)
 94 {
 95         return inl(gmux_data->iostart + port);
 96 }
 97 
 98 static void gmux_pio_write32(struct apple_gmux_data *gmux_data, int port,
 99                              u32 val)
100 {
101         int i;
102         u8 tmpval;
103 
104         for (i = 0; i < 4; i++) {
105                 tmpval = (val >> (i * 8)) & 0xff;
106                 outb(tmpval, gmux_data->iostart + port + i);
107         }
108 }
109 
110 static int gmux_index_wait_ready(struct apple_gmux_data *gmux_data)
111 {
112         int i = 200;
113         u8 gwr = inb(gmux_data->iostart + GMUX_PORT_WRITE);
114 
115         while (i && (gwr & 0x01)) {
116                 inb(gmux_data->iostart + GMUX_PORT_READ);
117                 gwr = inb(gmux_data->iostart + GMUX_PORT_WRITE);
118                 udelay(100);
119                 i--;
120         }
121 
122         return !!i;
123 }
124 
125 static int gmux_index_wait_complete(struct apple_gmux_data *gmux_data)
126 {
127         int i = 200;
128         u8 gwr = inb(gmux_data->iostart + GMUX_PORT_WRITE);
129 
130         while (i && !(gwr & 0x01)) {
131                 gwr = inb(gmux_data->iostart + GMUX_PORT_WRITE);
132                 udelay(100);
133                 i--;
134         }
135 
136         if (gwr & 0x01)
137                 inb(gmux_data->iostart + GMUX_PORT_READ);
138 
139         return !!i;
140 }
141 
142 static u8 gmux_index_read8(struct apple_gmux_data *gmux_data, int port)
143 {
144         u8 val;
145 
146         mutex_lock(&gmux_data->index_lock);
147         gmux_index_wait_ready(gmux_data);
148         outb((port & 0xff), gmux_data->iostart + GMUX_PORT_READ);
149         gmux_index_wait_complete(gmux_data);
150         val = inb(gmux_data->iostart + GMUX_PORT_VALUE);
151         mutex_unlock(&gmux_data->index_lock);
152 
153         return val;
154 }
155 
156 static void gmux_index_write8(struct apple_gmux_data *gmux_data, int port,
157                               u8 val)
158 {
159         mutex_lock(&gmux_data->index_lock);
160         outb(val, gmux_data->iostart + GMUX_PORT_VALUE);
161         gmux_index_wait_ready(gmux_data);
162         outb(port & 0xff, gmux_data->iostart + GMUX_PORT_WRITE);
163         gmux_index_wait_complete(gmux_data);
164         mutex_unlock(&gmux_data->index_lock);
165 }
166 
167 static u32 gmux_index_read32(struct apple_gmux_data *gmux_data, int port)
168 {
169         u32 val;
170 
171         mutex_lock(&gmux_data->index_lock);
172         gmux_index_wait_ready(gmux_data);
173         outb((port & 0xff), gmux_data->iostart + GMUX_PORT_READ);
174         gmux_index_wait_complete(gmux_data);
175         val = inl(gmux_data->iostart + GMUX_PORT_VALUE);
176         mutex_unlock(&gmux_data->index_lock);
177 
178         return val;
179 }
180 
181 static void gmux_index_write32(struct apple_gmux_data *gmux_data, int port,
182                                u32 val)
183 {
184         int i;
185         u8 tmpval;
186 
187         mutex_lock(&gmux_data->index_lock);
188 
189         for (i = 0; i < 4; i++) {
190                 tmpval = (val >> (i * 8)) & 0xff;
191                 outb(tmpval, gmux_data->iostart + GMUX_PORT_VALUE + i);
192         }
193 
194         gmux_index_wait_ready(gmux_data);
195         outb(port & 0xff, gmux_data->iostart + GMUX_PORT_WRITE);
196         gmux_index_wait_complete(gmux_data);
197         mutex_unlock(&gmux_data->index_lock);
198 }
199 
200 static u8 gmux_read8(struct apple_gmux_data *gmux_data, int port)
201 {
202         if (gmux_data->indexed)
203                 return gmux_index_read8(gmux_data, port);
204         else
205                 return gmux_pio_read8(gmux_data, port);
206 }
207 
208 static void gmux_write8(struct apple_gmux_data *gmux_data, int port, u8 val)
209 {
210         if (gmux_data->indexed)
211                 gmux_index_write8(gmux_data, port, val);
212         else
213                 gmux_pio_write8(gmux_data, port, val);
214 }
215 
216 static u32 gmux_read32(struct apple_gmux_data *gmux_data, int port)
217 {
218         if (gmux_data->indexed)
219                 return gmux_index_read32(gmux_data, port);
220         else
221                 return gmux_pio_read32(gmux_data, port);
222 }
223 
224 static void gmux_write32(struct apple_gmux_data *gmux_data, int port,
225                              u32 val)
226 {
227         if (gmux_data->indexed)
228                 gmux_index_write32(gmux_data, port, val);
229         else
230                 gmux_pio_write32(gmux_data, port, val);
231 }
232 
233 static bool gmux_is_indexed(struct apple_gmux_data *gmux_data)
234 {
235         u16 val;
236 
237         outb(0xaa, gmux_data->iostart + 0xcc);
238         outb(0x55, gmux_data->iostart + 0xcd);
239         outb(0x00, gmux_data->iostart + 0xce);
240 
241         val = inb(gmux_data->iostart + 0xcc) |
242                 (inb(gmux_data->iostart + 0xcd) << 8);
243 
244         if (val == 0x55aa)
245                 return true;
246 
247         return false;
248 }
249 
250 static int gmux_get_brightness(struct backlight_device *bd)
251 {
252         struct apple_gmux_data *gmux_data = bl_get_data(bd);
253         return gmux_read32(gmux_data, GMUX_PORT_BRIGHTNESS) &
254                GMUX_BRIGHTNESS_MASK;
255 }
256 
257 static int gmux_update_status(struct backlight_device *bd)
258 {
259         struct apple_gmux_data *gmux_data = bl_get_data(bd);
260         u32 brightness = bd->props.brightness;
261 
262         if (bd->props.state & BL_CORE_SUSPENDED)
263                 return 0;
264 
265         gmux_write32(gmux_data, GMUX_PORT_BRIGHTNESS, brightness);
266 
267         return 0;
268 }
269 
270 static const struct backlight_ops gmux_bl_ops = {
271         .options = BL_CORE_SUSPENDRESUME,
272         .get_brightness = gmux_get_brightness,
273         .update_status = gmux_update_status,
274 };
275 
276 static int gmux_switchto(enum vga_switcheroo_client_id id)
277 {
278         if (id == VGA_SWITCHEROO_IGD) {
279                 gmux_write8(apple_gmux_data, GMUX_PORT_SWITCH_DDC, 1);
280                 gmux_write8(apple_gmux_data, GMUX_PORT_SWITCH_DISPLAY, 2);
281                 gmux_write8(apple_gmux_data, GMUX_PORT_SWITCH_EXTERNAL, 2);
282         } else {
283                 gmux_write8(apple_gmux_data, GMUX_PORT_SWITCH_DDC, 2);
284                 gmux_write8(apple_gmux_data, GMUX_PORT_SWITCH_DISPLAY, 3);
285                 gmux_write8(apple_gmux_data, GMUX_PORT_SWITCH_EXTERNAL, 3);
286         }
287 
288         return 0;
289 }
290 
291 static int gmux_set_discrete_state(struct apple_gmux_data *gmux_data,
292                                    enum vga_switcheroo_state state)
293 {
294         reinit_completion(&gmux_data->powerchange_done);
295 
296         if (state == VGA_SWITCHEROO_ON) {
297                 gmux_write8(gmux_data, GMUX_PORT_DISCRETE_POWER, 1);
298                 gmux_write8(gmux_data, GMUX_PORT_DISCRETE_POWER, 3);
299                 pr_debug("Discrete card powered up\n");
300         } else {
301                 gmux_write8(gmux_data, GMUX_PORT_DISCRETE_POWER, 1);
302                 gmux_write8(gmux_data, GMUX_PORT_DISCRETE_POWER, 0);
303                 pr_debug("Discrete card powered down\n");
304         }
305 
306         gmux_data->power_state = state;
307 
308         if (gmux_data->gpe >= 0 &&
309             !wait_for_completion_interruptible_timeout(&gmux_data->powerchange_done,
310                                                        msecs_to_jiffies(200)))
311                 pr_warn("Timeout waiting for gmux switch to complete\n");
312 
313         return 0;
314 }
315 
316 static int gmux_set_power_state(enum vga_switcheroo_client_id id,
317                                 enum vga_switcheroo_state state)
318 {
319         if (id == VGA_SWITCHEROO_IGD)
320                 return 0;
321 
322         return gmux_set_discrete_state(apple_gmux_data, state);
323 }
324 
325 static int gmux_get_client_id(struct pci_dev *pdev)
326 {
327         /*
328          * Early Macbook Pros with switchable graphics use nvidia
329          * integrated graphics. Hardcode that the 9400M is integrated.
330          */
331         if (pdev->vendor == PCI_VENDOR_ID_INTEL)
332                 return VGA_SWITCHEROO_IGD;
333         else if (pdev->vendor == PCI_VENDOR_ID_NVIDIA &&
334                  pdev->device == 0x0863)
335                 return VGA_SWITCHEROO_IGD;
336         else
337                 return VGA_SWITCHEROO_DIS;
338 }
339 
340 static enum vga_switcheroo_client_id
341 gmux_active_client(struct apple_gmux_data *gmux_data)
342 {
343         if (gmux_read8(gmux_data, GMUX_PORT_SWITCH_DISPLAY) == 2)
344                 return VGA_SWITCHEROO_IGD;
345 
346         return VGA_SWITCHEROO_DIS;
347 }
348 
349 static struct vga_switcheroo_handler gmux_handler = {
350         .switchto = gmux_switchto,
351         .power_state = gmux_set_power_state,
352         .get_client_id = gmux_get_client_id,
353 };
354 
355 static inline void gmux_disable_interrupts(struct apple_gmux_data *gmux_data)
356 {
357         gmux_write8(gmux_data, GMUX_PORT_INTERRUPT_ENABLE,
358                     GMUX_INTERRUPT_DISABLE);
359 }
360 
361 static inline void gmux_enable_interrupts(struct apple_gmux_data *gmux_data)
362 {
363         gmux_write8(gmux_data, GMUX_PORT_INTERRUPT_ENABLE,
364                     GMUX_INTERRUPT_ENABLE);
365 }
366 
367 static inline u8 gmux_interrupt_get_status(struct apple_gmux_data *gmux_data)
368 {
369         return gmux_read8(gmux_data, GMUX_PORT_INTERRUPT_STATUS);
370 }
371 
372 static void gmux_clear_interrupts(struct apple_gmux_data *gmux_data)
373 {
374         u8 status;
375 
376         /* to clear interrupts write back current status */
377         status = gmux_interrupt_get_status(gmux_data);
378         gmux_write8(gmux_data, GMUX_PORT_INTERRUPT_STATUS, status);
379 }
380 
381 static void gmux_notify_handler(acpi_handle device, u32 value, void *context)
382 {
383         u8 status;
384         struct pnp_dev *pnp = (struct pnp_dev *)context;
385         struct apple_gmux_data *gmux_data = pnp_get_drvdata(pnp);
386 
387         status = gmux_interrupt_get_status(gmux_data);
388         gmux_disable_interrupts(gmux_data);
389         pr_debug("Notify handler called: status %d\n", status);
390 
391         gmux_clear_interrupts(gmux_data);
392         gmux_enable_interrupts(gmux_data);
393 
394         if (status & GMUX_INTERRUPT_STATUS_POWER)
395                 complete(&gmux_data->powerchange_done);
396 }
397 
398 static int gmux_suspend(struct device *dev)
399 {
400         struct pnp_dev *pnp = to_pnp_dev(dev);
401         struct apple_gmux_data *gmux_data = pnp_get_drvdata(pnp);
402 
403         gmux_data->resume_client_id = gmux_active_client(gmux_data);
404         gmux_disable_interrupts(gmux_data);
405         return 0;
406 }
407 
408 static int gmux_resume(struct device *dev)
409 {
410         struct pnp_dev *pnp = to_pnp_dev(dev);
411         struct apple_gmux_data *gmux_data = pnp_get_drvdata(pnp);
412 
413         gmux_enable_interrupts(gmux_data);
414         gmux_switchto(gmux_data->resume_client_id);
415         if (gmux_data->power_state == VGA_SWITCHEROO_OFF)
416                 gmux_set_discrete_state(gmux_data, gmux_data->power_state);
417         return 0;
418 }
419 
420 static struct pci_dev *gmux_get_io_pdev(void)
421 {
422         struct pci_dev *pdev = NULL;
423 
424         while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev))) {
425                 u16 cmd;
426 
427                 pci_read_config_word(pdev, PCI_COMMAND, &cmd);
428                 if (!(cmd & PCI_COMMAND_IO))
429                         continue;
430 
431                 return pdev;
432         }
433 
434         return NULL;
435 }
436 
437 static int gmux_probe(struct pnp_dev *pnp, const struct pnp_device_id *id)
438 {
439         struct apple_gmux_data *gmux_data;
440         struct resource *res;
441         struct backlight_properties props;
442         struct backlight_device *bdev;
443         u8 ver_major, ver_minor, ver_release;
444         int ret = -ENXIO;
445         acpi_status status;
446         unsigned long long gpe;
447         struct pci_dev *pdev = NULL;
448 
449         if (apple_gmux_data)
450                 return -EBUSY;
451 
452         gmux_data = kzalloc(sizeof(*gmux_data), GFP_KERNEL);
453         if (!gmux_data)
454                 return -ENOMEM;
455         pnp_set_drvdata(pnp, gmux_data);
456 
457         res = pnp_get_resource(pnp, IORESOURCE_IO, 0);
458         if (!res) {
459                 pr_err("Failed to find gmux I/O resource\n");
460                 goto err_free;
461         }
462 
463         gmux_data->iostart = res->start;
464         gmux_data->iolen = res->end - res->start;
465 
466         if (gmux_data->iolen < GMUX_MIN_IO_LEN) {
467                 pr_err("gmux I/O region too small (%lu < %u)\n",
468                        gmux_data->iolen, GMUX_MIN_IO_LEN);
469                 goto err_free;
470         }
471 
472         if (!request_region(gmux_data->iostart, gmux_data->iolen,
473                             "Apple gmux")) {
474                 pr_err("gmux I/O already in use\n");
475                 goto err_free;
476         }
477 
478         /*
479          * Invalid version information may indicate either that the gmux
480          * device isn't present or that it's a new one that uses indexed
481          * io
482          */
483 
484         ver_major = gmux_read8(gmux_data, GMUX_PORT_VERSION_MAJOR);
485         ver_minor = gmux_read8(gmux_data, GMUX_PORT_VERSION_MINOR);
486         ver_release = gmux_read8(gmux_data, GMUX_PORT_VERSION_RELEASE);
487         if (ver_major == 0xff && ver_minor == 0xff && ver_release == 0xff) {
488                 if (gmux_is_indexed(gmux_data)) {
489                         u32 version;
490                         mutex_init(&gmux_data->index_lock);
491                         gmux_data->indexed = true;
492                         version = gmux_read32(gmux_data,
493                                 GMUX_PORT_VERSION_MAJOR);
494                         ver_major = (version >> 24) & 0xff;
495                         ver_minor = (version >> 16) & 0xff;
496                         ver_release = (version >> 8) & 0xff;
497                 } else {
498                         pr_info("gmux device not present or IO disabled\n");
499                         ret = -ENODEV;
500                         goto err_release;
501                 }
502         }
503         pr_info("Found gmux version %d.%d.%d [%s]\n", ver_major, ver_minor,
504                 ver_release, (gmux_data->indexed ? "indexed" : "classic"));
505 
506         /*
507          * Apple systems with gmux are EFI based and normally don't use
508          * VGA. In addition changing IO+MEM ownership between IGP and dGPU
509          * disables IO/MEM used for backlight control on some systems.
510          * Lock IO+MEM to GPU with active IO to prevent switch.
511          */
512         pdev = gmux_get_io_pdev();
513         if (pdev && vga_tryget(pdev,
514                                VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM)) {
515                 pr_err("IO+MEM vgaarb-locking for PCI:%s failed\n",
516                         pci_name(pdev));
517                 ret = -EBUSY;
518                 goto err_release;
519         } else if (pdev)
520                 pr_info("locked IO for PCI:%s\n", pci_name(pdev));
521         gmux_data->pdev = pdev;
522 
523         memset(&props, 0, sizeof(props));
524         props.type = BACKLIGHT_PLATFORM;
525         props.max_brightness = gmux_read32(gmux_data, GMUX_PORT_MAX_BRIGHTNESS);
526 
527         /*
528          * Currently it's assumed that the maximum brightness is less than
529          * 2^24 for compatibility with old gmux versions. Cap the max
530          * brightness at this value, but print a warning if the hardware
531          * reports something higher so that it can be fixed.
532          */
533         if (WARN_ON(props.max_brightness > GMUX_MAX_BRIGHTNESS))
534                 props.max_brightness = GMUX_MAX_BRIGHTNESS;
535 
536         bdev = backlight_device_register("gmux_backlight", &pnp->dev,
537                                          gmux_data, &gmux_bl_ops, &props);
538         if (IS_ERR(bdev)) {
539                 ret = PTR_ERR(bdev);
540                 goto err_release;
541         }
542 
543         gmux_data->bdev = bdev;
544         bdev->props.brightness = gmux_get_brightness(bdev);
545         backlight_update_status(bdev);
546 
547         /*
548          * The backlight situation on Macs is complicated. If the gmux is
549          * present it's the best choice, because it always works for
550          * backlight control and supports more levels than other options.
551          * Disable the other backlight choices.
552          */
553         acpi_video_dmi_promote_vendor();
554         acpi_video_unregister();
555         apple_bl_unregister();
556 
557         gmux_data->power_state = VGA_SWITCHEROO_ON;
558 
559         gmux_data->dhandle = ACPI_HANDLE(&pnp->dev);
560         if (!gmux_data->dhandle) {
561                 pr_err("Cannot find acpi handle for pnp device %s\n",
562                        dev_name(&pnp->dev));
563                 ret = -ENODEV;
564                 goto err_notify;
565         }
566 
567         status = acpi_evaluate_integer(gmux_data->dhandle, "GMGP", NULL, &gpe);
568         if (ACPI_SUCCESS(status)) {
569                 gmux_data->gpe = (int)gpe;
570 
571                 status = acpi_install_notify_handler(gmux_data->dhandle,
572                                                      ACPI_DEVICE_NOTIFY,
573                                                      &gmux_notify_handler, pnp);
574                 if (ACPI_FAILURE(status)) {
575                         pr_err("Install notify handler failed: %s\n",
576                                acpi_format_exception(status));
577                         ret = -ENODEV;
578                         goto err_notify;
579                 }
580 
581                 status = acpi_enable_gpe(NULL, gmux_data->gpe);
582                 if (ACPI_FAILURE(status)) {
583                         pr_err("Cannot enable gpe: %s\n",
584                                acpi_format_exception(status));
585                         goto err_enable_gpe;
586                 }
587         } else {
588                 pr_warn("No GPE found for gmux\n");
589                 gmux_data->gpe = -1;
590         }
591 
592         if (vga_switcheroo_register_handler(&gmux_handler)) {
593                 ret = -ENODEV;
594                 goto err_register_handler;
595         }
596 
597         init_completion(&gmux_data->powerchange_done);
598         apple_gmux_data = gmux_data;
599         gmux_enable_interrupts(gmux_data);
600 
601         return 0;
602 
603 err_register_handler:
604         if (gmux_data->gpe >= 0)
605                 acpi_disable_gpe(NULL, gmux_data->gpe);
606 err_enable_gpe:
607         if (gmux_data->gpe >= 0)
608                 acpi_remove_notify_handler(gmux_data->dhandle,
609                                            ACPI_DEVICE_NOTIFY,
610                                            &gmux_notify_handler);
611 err_notify:
612         backlight_device_unregister(bdev);
613 err_release:
614         if (gmux_data->pdev)
615                 vga_put(gmux_data->pdev,
616                         VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM);
617         pci_dev_put(pdev);
618         release_region(gmux_data->iostart, gmux_data->iolen);
619 err_free:
620         kfree(gmux_data);
621         return ret;
622 }
623 
624 static void gmux_remove(struct pnp_dev *pnp)
625 {
626         struct apple_gmux_data *gmux_data = pnp_get_drvdata(pnp);
627 
628         vga_switcheroo_unregister_handler();
629         gmux_disable_interrupts(gmux_data);
630         if (gmux_data->gpe >= 0) {
631                 acpi_disable_gpe(NULL, gmux_data->gpe);
632                 acpi_remove_notify_handler(gmux_data->dhandle,
633                                            ACPI_DEVICE_NOTIFY,
634                                            &gmux_notify_handler);
635         }
636 
637         if (gmux_data->pdev) {
638                 vga_put(gmux_data->pdev,
639                         VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM);
640                 pci_dev_put(gmux_data->pdev);
641         }
642         backlight_device_unregister(gmux_data->bdev);
643 
644         release_region(gmux_data->iostart, gmux_data->iolen);
645         apple_gmux_data = NULL;
646         kfree(gmux_data);
647 
648         acpi_video_dmi_demote_vendor();
649         acpi_video_register();
650         apple_bl_register();
651 }
652 
653 static const struct pnp_device_id gmux_device_ids[] = {
654         {"APP000B", 0},
655         {"", 0}
656 };
657 
658 static const struct dev_pm_ops gmux_dev_pm_ops = {
659         .suspend = gmux_suspend,
660         .resume = gmux_resume,
661 };
662 
663 static struct pnp_driver gmux_pnp_driver = {
664         .name           = "apple-gmux",
665         .probe          = gmux_probe,
666         .remove         = gmux_remove,
667         .id_table       = gmux_device_ids,
668         .driver         = {
669                         .pm = &gmux_dev_pm_ops,
670         },
671 };
672 
673 module_pnp_driver(gmux_pnp_driver);
674 MODULE_AUTHOR("Seth Forshee <seth.forshee@canonical.com>");
675 MODULE_DESCRIPTION("Apple Gmux Driver");
676 MODULE_LICENSE("GPL");
677 MODULE_DEVICE_TABLE(pnp, gmux_device_ids);
678 

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