Version:  2.0.40 2.2.26 2.4.37 3.2 3.3 3.4 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

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

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