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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
28struct 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
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
44static struct apple_gmux_data *apple_gmux_data;
45
46
47
48
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
80static u8 gmux_pio_read8(struct apple_gmux_data *gmux_data, int port)
81{
82 return inb(gmux_data->iostart + port);
83}
84
85static 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
91static u32 gmux_pio_read32(struct apple_gmux_data *gmux_data, int port)
92{
93 return inl(gmux_data->iostart + port);
94}
95
96static 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
108static 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
123static 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
140static 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
154static 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
165static 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
179static 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
198static 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
206static 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
214static 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
222static 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
231static 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
248static 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
255static 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
268static 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
274static 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
289static int gmux_set_discrete_state(struct apple_gmux_data *gmux_data,
290 enum vga_switcheroo_state state)
291{
292 INIT_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
314static 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
323static int gmux_get_client_id(struct pci_dev *pdev)
324{
325
326
327
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
338static enum vga_switcheroo_client_id
339gmux_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
347static 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
353static 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
359static 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
365static 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
370static void gmux_clear_interrupts(struct apple_gmux_data *gmux_data)
371{
372 u8 status;
373
374
375 status = gmux_interrupt_get_status(gmux_data);
376 gmux_write8(gmux_data, GMUX_PORT_INTERRUPT_STATUS, status);
377}
378
379static 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
396static 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
406static 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
418static 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
460
461
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
492
493
494
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
512
513
514
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 = DEVICE_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
566err_register_handler:
567 if (gmux_data->gpe >= 0)
568 acpi_disable_gpe(NULL, gmux_data->gpe);
569err_enable_gpe:
570 if (gmux_data->gpe >= 0)
571 acpi_remove_notify_handler(gmux_data->dhandle,
572 ACPI_DEVICE_NOTIFY,
573 &gmux_notify_handler);
574err_notify:
575 backlight_device_unregister(bdev);
576err_release:
577 release_region(gmux_data->iostart, gmux_data->iolen);
578err_free:
579 kfree(gmux_data);
580 return ret;
581}
582
583static 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
607static const struct pnp_device_id gmux_device_ids[] = {
608 {"APP000B", 0},
609 {"", 0}
610};
611
612static const struct dev_pm_ops gmux_dev_pm_ops = {
613 .suspend = gmux_suspend,
614 .resume = gmux_resume,
615};
616
617static 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
627static int __init apple_gmux_init(void)
628{
629 return pnp_register_driver(&gmux_pnp_driver);
630}
631
632static void __exit apple_gmux_exit(void)
633{
634 pnp_unregister_driver(&gmux_pnp_driver);
635}
636
637module_init(apple_gmux_init);
638module_exit(apple_gmux_exit);
639
640MODULE_AUTHOR("Seth Forshee <seth.forshee@canonical.com>");
641MODULE_DESCRIPTION("Apple Gmux Driver");
642MODULE_LICENSE("GPL");
643MODULE_DEVICE_TABLE(pnp, gmux_device_ids);
644
