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