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Merge branch 'libnvdimm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdim...
[deliverable/linux.git] / drivers / staging / olpc_dcon / olpc_dcon.c
CommitLineData
53c43c5c
GKH		 1/*
2 * Mainly by David Woodhouse, somewhat modified by Jordan Crouse
3 *
4 * Copyright © 2006-2007 Red Hat, Inc.
5 * Copyright © 2006-2007 Advanced Micro Devices, Inc.
6 * Copyright © 2009 VIA Technology, Inc.
7 * Copyright (c) 2010-2011 Andres Salomon <dilinger@queued.net>
8 *
9 * This program is free software. You can redistribute it and/or
10 * modify it under the terms of version 2 of the GNU General Public
11 * License as published by the Free Software Foundation.
12 */
13
14#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
15
16#include <linux/kernel.h>
17#include <linux/fb.h>
18#include <linux/console.h>
19#include <linux/i2c.h>
20#include <linux/platform_device.h>
21#include <linux/interrupt.h>
22#include <linux/delay.h>
23#include <linux/module.h>
24#include <linux/backlight.h>
25#include <linux/device.h>
26#include <linux/uaccess.h>
27#include <linux/ctype.h>
28#include <linux/reboot.h>
29#include <linux/olpc-ec.h>
30#include <asm/tsc.h>
31#include <asm/olpc.h>
32
33#include "olpc_dcon.h"
34
35/* Module definitions */
36
37static ushort resumeline = 898;
38module_param(resumeline, ushort, 0444);
39
40static struct dcon_platform_data *pdata;
41
42/* I2C structures */
43
44/* Platform devices */
45static struct platform_device *dcon_device;
46
47static unsigned short normal_i2c[] = { 0x0d, I2C_CLIENT_END };
48
49static s32 dcon_write(struct dcon_priv *dcon, u8 reg, u16 val)
50{
51 return i2c_smbus_write_word_data(dcon->client, reg, val);
52}
53
54static s32 dcon_read(struct dcon_priv *dcon, u8 reg)
55{
56 return i2c_smbus_read_word_data(dcon->client, reg);
57}
58
59/* ===== API functions - these are called by a variety of users ==== */
60
61static int dcon_hw_init(struct dcon_priv *dcon, int is_init)
62{
63 u16 ver;
64 int rc = 0;
65
66 ver = dcon_read(dcon, DCON_REG_ID);
67 if ((ver >> 8) != 0xDC) {
68 pr_err("DCON ID not 0xDCxx: 0x%04x instead.\n", ver);
69 rc = -ENXIO;
70 goto err;
71 }
72
73 if (is_init) {
74 pr_info("Discovered DCON version %x\n", ver & 0xFF);
75 rc = pdata->init(dcon);
76 if (rc != 0) {
77 pr_err("Unable to init.\n");
78 goto err;
79 }
80 }
81
82 if (ver < 0xdc02) {
83 dev_err(&dcon->client->dev,
84 "DCON v1 is unsupported, giving up..\n");
85 rc = -ENODEV;
86 goto err;
87 }
88
89 /* SDRAM setup/hold time */
90 dcon_write(dcon, 0x3a, 0xc040);
91 dcon_write(dcon, DCON_REG_MEM_OPT_A, 0x0000); /* clear option bits */
92 dcon_write(dcon, DCON_REG_MEM_OPT_A,
93 MEM_DLL_CLOCK_DELAY | MEM_POWER_DOWN);
94 dcon_write(dcon, DCON_REG_MEM_OPT_B, MEM_SOFT_RESET);
95
96 /* Colour swizzle, AA, no passthrough, backlight */
97 if (is_init) {
98 dcon->disp_mode = MODE_PASSTHRU | MODE_BL_ENABLE |
99 MODE_CSWIZZLE | MODE_COL_AA;
100 }
101 dcon_write(dcon, DCON_REG_MODE, dcon->disp_mode);
102
103 /* Set the scanline to interrupt on during resume */
104 dcon_write(dcon, DCON_REG_SCAN_INT, resumeline);
105
106err:
107 return rc;
108}
109
110/*
111 * The smbus doesn't always come back due to what is believed to be
112 * hardware (power rail) bugs. For older models where this is known to
113 * occur, our solution is to attempt to wait for the bus to stabilize;
114 * if it doesn't happen, cut power to the dcon, repower it, and wait
115 * for the bus to stabilize. Rinse, repeat until we have a working
116 * smbus. For newer models, we simply BUG(); we want to know if this
117 * still happens despite the power fixes that have been made!
118 */
119static int dcon_bus_stabilize(struct dcon_priv *dcon, int is_powered_down)
120{
121 unsigned long timeout;
122 u8 pm;
123 int x;
124
125power_up:
126 if (is_powered_down) {
127 pm = 1;
128 x = olpc_ec_cmd(EC_DCON_POWER_MODE, &pm, 1, NULL, 0);
129 if (x) {
130 pr_warn("unable to force dcon to power up: %d!\n", x);
131 return x;
132 }
133 usleep_range(10000, 11000); /* we'll be conservative */
134 }
135
136 pdata->bus_stabilize_wiggle();
137
138 for (x = -1, timeout = 50; timeout && x < 0; timeout--) {
139 usleep_range(1000, 1100);
140 x = dcon_read(dcon, DCON_REG_ID);
141 }
142 if (x < 0) {
143 pr_err("unable to stabilize dcon's smbus, reasserting power and praying.\n");
144 BUG_ON(olpc_board_at_least(olpc_board(0xc2)));
145 pm = 0;
146 olpc_ec_cmd(EC_DCON_POWER_MODE, &pm, 1, NULL, 0);
147 msleep(100);
148 is_powered_down = 1;
149 goto power_up; /* argh, stupid hardware.. */
150 }
151
152 if (is_powered_down)
153 return dcon_hw_init(dcon, 0);
154 return 0;
155}
156
157static void dcon_set_backlight(struct dcon_priv *dcon, u8 level)
158{
159 dcon->bl_val = level;
160 dcon_write(dcon, DCON_REG_BRIGHT, dcon->bl_val);
161
162 /* Purposely turn off the backlight when we go to level 0 */
163 if (dcon->bl_val == 0) {
164 dcon->disp_mode &= ~MODE_BL_ENABLE;
165 dcon_write(dcon, DCON_REG_MODE, dcon->disp_mode);
166 } else if (!(dcon->disp_mode & MODE_BL_ENABLE)) {
167 dcon->disp_mode |= MODE_BL_ENABLE;
168 dcon_write(dcon, DCON_REG_MODE, dcon->disp_mode);
169 }
170}
171
172/* Set the output type to either color or mono */
173static int dcon_set_mono_mode(struct dcon_priv *dcon, bool enable_mono)
174{
175 if (dcon->mono == enable_mono)
176 return 0;
177
178 dcon->mono = enable_mono;
179
180 if (enable_mono) {
181 dcon->disp_mode &= ~(MODE_CSWIZZLE | MODE_COL_AA);
182 dcon->disp_mode |= MODE_MONO_LUMA;
183 } else {
184 dcon->disp_mode &= ~(MODE_MONO_LUMA);
185 dcon->disp_mode |= MODE_CSWIZZLE | MODE_COL_AA;
186 }
187
188 dcon_write(dcon, DCON_REG_MODE, dcon->disp_mode);
189 return 0;
190}
191
192/* For now, this will be really stupid - we need to address how
193 * DCONLOAD works in a sleep and account for it accordingly
194 */
195
196static void dcon_sleep(struct dcon_priv *dcon, bool sleep)
197{
198 int x;
199
200 /* Turn off the backlight and put the DCON to sleep */
201
202 if (dcon->asleep == sleep)
203 return;
204
205 if (!olpc_board_at_least(olpc_board(0xc2)))
206 return;
207
208 if (sleep) {
209 u8 pm = 0;
210
211 x = olpc_ec_cmd(EC_DCON_POWER_MODE, &pm, 1, NULL, 0);
212 if (x)
213 pr_warn("unable to force dcon to power down: %d!\n", x);
214 else
215 dcon->asleep = sleep;
216 } else {
217 /* Only re-enable the backlight if the backlight value is set */
218 if (dcon->bl_val != 0)
219 dcon->disp_mode |= MODE_BL_ENABLE;
220 x = dcon_bus_stabilize(dcon, 1);
221 if (x)
222 pr_warn("unable to reinit dcon hardware: %d!\n", x);
223 else
224 dcon->asleep = sleep;
225
226 /* Restore backlight */
227 dcon_set_backlight(dcon, dcon->bl_val);
228 }
229
230 /* We should turn off some stuff in the framebuffer - but what? */
231}
232
233/* the DCON seems to get confused if we change DCONLOAD too
234 * frequently -- i.e., approximately faster than frame time.
235 * normally we don't change it this fast, so in general we won't
236 * delay here.
237 */
238static void dcon_load_holdoff(struct dcon_priv *dcon)
239{
240 ktime_t delta_t, now;
241
242 while (1) {
243 now = ktime_get();
244 delta_t = ktime_sub(now, dcon->load_time);
245 if (ktime_to_ns(delta_t) > NSEC_PER_MSEC * 20)
246 break;
247 mdelay(4);
248 }
249}
250
251static bool dcon_blank_fb(struct dcon_priv *dcon, bool blank)
252{
253 int err;
254
255 console_lock();
256 if (!lock_fb_info(dcon->fbinfo)) {
257 console_unlock();
258 dev_err(&dcon->client->dev, "unable to lock framebuffer\n");
259 return false;
260 }
261
262 dcon->ignore_fb_events = true;
263 err = fb_blank(dcon->fbinfo,
264 blank ? FB_BLANK_POWERDOWN : FB_BLANK_UNBLANK);
265 dcon->ignore_fb_events = false;
266 unlock_fb_info(dcon->fbinfo);
267 console_unlock();
268
269 if (err) {
270 dev_err(&dcon->client->dev, "couldn't %sblank framebuffer\n",
271 blank ? "" : "un");
272 return false;
273 }
274 return true;
275}
276
277/* Set the source of the display (CPU or DCON) */
278static void dcon_source_switch(struct work_struct *work)
279{
280 struct dcon_priv *dcon = container_of(work, struct dcon_priv,
281 switch_source);
282 int source = dcon->pending_src;
283
284 if (dcon->curr_src == source)
285 return;
286
287 dcon_load_holdoff(dcon);
288
289 dcon->switched = false;
290
291 switch (source) {
292 case DCON_SOURCE_CPU:
293 pr_info("dcon_source_switch to CPU\n");
294 /* Enable the scanline interrupt bit */
295 if (dcon_write(dcon, DCON_REG_MODE,
296 dcon->disp_mode | MODE_SCAN_INT))
297 pr_err("couldn't enable scanline interrupt!\n");
298 else
299 /* Wait up to one second for the scanline interrupt */
300 wait_event_timeout(dcon->waitq, dcon->switched, HZ);
301
302 if (!dcon->switched)
303 pr_err("Timeout entering CPU mode; expect a screen glitch.\n");
304
305 /* Turn off the scanline interrupt */
306 if (dcon_write(dcon, DCON_REG_MODE, dcon->disp_mode))
307 pr_err("couldn't disable scanline interrupt!\n");
308
309 /*
310 * Ideally we'd like to disable interrupts here so that the
311 * fb unblanking and DCON turn on happen at a known time value;
312 * however, we can't do that right now with fb_blank
313 * messing with semaphores.
314 *
315 * For now, we just hope..
316 */
317 if (!dcon_blank_fb(dcon, false)) {
318 pr_err("Failed to enter CPU mode\n");
319 dcon->pending_src = DCON_SOURCE_DCON;
320 return;
321 }
322
323 /* And turn off the DCON */
324 pdata->set_dconload(1);
325 dcon->load_time = ktime_get();
326
327 pr_info("The CPU has control\n");
328 break;
329 case DCON_SOURCE_DCON:
330 {
331 ktime_t delta_t;
332
333 pr_info("dcon_source_switch to DCON\n");
334
335 /* Clear DCONLOAD - this implies that the DCON is in control */
336 pdata->set_dconload(0);
337 dcon->load_time = ktime_get();
338
339 wait_event_timeout(dcon->waitq, dcon->switched, HZ/2);
340
341 if (!dcon->switched) {
342 pr_err("Timeout entering DCON mode; expect a screen glitch.\n");
343 } else {
344 /* sometimes the DCON doesn't follow its own rules,
345 * and doesn't wait for two vsync pulses before
346 * ack'ing the frame load with an IRQ. the result
347 * is that the display shows the *previously*
348 * loaded frame. we can detect this by looking at
349 * the time between asserting DCONLOAD and the IRQ --
350 * if it's less than 20msec, then the DCON couldn't
351 * have seen two VSYNC pulses. in that case we
352 * deassert and reassert, and hope for the best.
353 * see http://dev.laptop.org/ticket/9664
354 */
355 delta_t = ktime_sub(dcon->irq_time, dcon->load_time);
356 if (dcon->switched && ktime_to_ns(delta_t)
357 < NSEC_PER_MSEC * 20) {
358 pr_err("missed loading, retrying\n");
359 pdata->set_dconload(1);
360 mdelay(41);
361 pdata->set_dconload(0);
362 dcon->load_time = ktime_get();
363 mdelay(41);
364 }
365 }
366
367 dcon_blank_fb(dcon, true);
368 pr_info("The DCON has control\n");
369 break;
370 }
371 default:
372 BUG();
373 }
374
375 dcon->curr_src = source;
376}
377
378static void dcon_set_source(struct dcon_priv *dcon, int arg)
379{
380 if (dcon->pending_src == arg)
381 return;
382
383 dcon->pending_src = arg;
384
385 if (dcon->curr_src != arg)
386 schedule_work(&dcon->switch_source);
387}
388
389static void dcon_set_source_sync(struct dcon_priv *dcon, int arg)
390{
391 dcon_set_source(dcon, arg);
392 flush_scheduled_work();
393}
394
395static ssize_t dcon_mode_show(struct device *dev,
396 struct device_attribute *attr, char *buf)
397{
398 struct dcon_priv *dcon = dev_get_drvdata(dev);
399
400 return sprintf(buf, "%4.4X\n", dcon->disp_mode);
401}
402
403static ssize_t dcon_sleep_show(struct device *dev,
404 struct device_attribute *attr, char *buf)
405{
406 struct dcon_priv *dcon = dev_get_drvdata(dev);
407
408 return sprintf(buf, "%d\n", dcon->asleep);
409}
410
411static ssize_t dcon_freeze_show(struct device *dev,
412 struct device_attribute *attr, char *buf)
413{
414 struct dcon_priv *dcon = dev_get_drvdata(dev);
415
416 return sprintf(buf, "%d\n", dcon->curr_src == DCON_SOURCE_DCON ? 1 : 0);
417}
418
419static ssize_t dcon_mono_show(struct device *dev,
420 struct device_attribute *attr, char *buf)
421{
422 struct dcon_priv *dcon = dev_get_drvdata(dev);
423
424 return sprintf(buf, "%d\n", dcon->mono);
425}
426
427static ssize_t dcon_resumeline_show(struct device *dev,
428 struct device_attribute *attr, char *buf)
429{
430 return sprintf(buf, "%d\n", resumeline);
431}
432
433static ssize_t dcon_mono_store(struct device *dev,
434 struct device_attribute *attr, const char *buf, size_t count)
435{
436 unsigned long enable_mono;
437 int rc;
438
439 rc = kstrtoul(buf, 10, &enable_mono);
440 if (rc)
441 return rc;
442
443 dcon_set_mono_mode(dev_get_drvdata(dev), enable_mono ? true : false);
444
445 return count;
446}
447
448static ssize_t dcon_freeze_store(struct device *dev,
449 struct device_attribute *attr, const char *buf, size_t count)
450{
451 struct dcon_priv *dcon = dev_get_drvdata(dev);
452 unsigned long output;
453 int ret;
454
455 ret = kstrtoul(buf, 10, &output);
456 if (ret)
457 return ret;
458
459 pr_info("dcon_freeze_store: %lu\n", output);
460
461 switch (output) {
462 case 0:
463 dcon_set_source(dcon, DCON_SOURCE_CPU);
464 break;
465 case 1:
466 dcon_set_source_sync(dcon, DCON_SOURCE_DCON);
467 break;
468 case 2: /* normally unused */
469 dcon_set_source(dcon, DCON_SOURCE_DCON);
470 break;
471 default:
472 return -EINVAL;
473 }
474
475 return count;
476}
477
478static ssize_t dcon_resumeline_store(struct device *dev,
479 struct device_attribute *attr, const char *buf, size_t count)
480{
481 unsigned short rl;
482 int rc;
483
484 rc = kstrtou16(buf, 10, &rl);
485 if (rc)
486 return rc;
487
488 resumeline = rl;
489 dcon_write(dev_get_drvdata(dev), DCON_REG_SCAN_INT, resumeline);
490
491 return count;
492}
493
494static ssize_t dcon_sleep_store(struct device *dev,
495 struct device_attribute *attr, const char *buf, size_t count)
496{
497 unsigned long output;
498 int ret;
499
500 ret = kstrtoul(buf, 10, &output);
501 if (ret)
502 return ret;
503
504 dcon_sleep(dev_get_drvdata(dev), output ? true : false);
505 return count;
506}
507
508static struct device_attribute dcon_device_files[] = {
509 __ATTR(mode, 0444, dcon_mode_show, NULL),
510 __ATTR(sleep, 0644, dcon_sleep_show, dcon_sleep_store),
511 __ATTR(freeze, 0644, dcon_freeze_show, dcon_freeze_store),
512 __ATTR(monochrome, 0644, dcon_mono_show, dcon_mono_store),
513 __ATTR(resumeline, 0644, dcon_resumeline_show, dcon_resumeline_store),
514};
515
516static int dcon_bl_update(struct backlight_device *dev)
517{
518 struct dcon_priv *dcon = bl_get_data(dev);
519 u8 level = dev->props.brightness & 0x0F;
520
521 if (dev->props.power != FB_BLANK_UNBLANK)
522 level = 0;
523
524 if (level != dcon->bl_val)
525 dcon_set_backlight(dcon, level);
526
527 /* power down the DCON when the screen is blanked */
528 if (!dcon->ignore_fb_events)
529 dcon_sleep(dcon, !!(dev->props.state & BL_CORE_FBBLANK));
530
531 return 0;
532}
533
534static int dcon_bl_get(struct backlight_device *dev)
535{
536 struct dcon_priv *dcon = bl_get_data(dev);
537
538 return dcon->bl_val;
539}
540
541static const struct backlight_ops dcon_bl_ops = {
542 .update_status = dcon_bl_update,
543 .get_brightness = dcon_bl_get,
544};
545
546static struct backlight_properties dcon_bl_props = {
547 .max_brightness = 15,
548 .type = BACKLIGHT_RAW,
549 .power = FB_BLANK_UNBLANK,
550};
551
552static int dcon_reboot_notify(struct notifier_block *nb,
553 unsigned long foo, void *bar)
554{
555 struct dcon_priv *dcon = container_of(nb, struct dcon_priv, reboot_nb);
556
557 if (!dcon || !dcon->client)
558 return NOTIFY_DONE;
559
560 /* Turn off the DCON. Entirely. */
561 dcon_write(dcon, DCON_REG_MODE, 0x39);
562 dcon_write(dcon, DCON_REG_MODE, 0x32);
563 return NOTIFY_DONE;
564}
565
566static int unfreeze_on_panic(struct notifier_block *nb,
567 unsigned long e, void *p)
568{
569 pdata->set_dconload(1);
570 return NOTIFY_DONE;
571}
572
573static struct notifier_block dcon_panic_nb = {
574 .notifier_call = unfreeze_on_panic,
575};
576
577static int dcon_detect(struct i2c_client *client, struct i2c_board_info *info)
578{
579 strlcpy(info->type, "olpc_dcon", I2C_NAME_SIZE);
580
581 return 0;
582}
583
584static int dcon_probe(struct i2c_client *client, const struct i2c_device_id *id)
585{
586 struct dcon_priv *dcon;
587 int rc, i, j;
588
589 if (!pdata)
590 return -ENXIO;
591
592 dcon = kzalloc(sizeof(*dcon), GFP_KERNEL);
593 if (!dcon)
594 return -ENOMEM;
595
596 dcon->client = client;
597 init_waitqueue_head(&dcon->waitq);
598 INIT_WORK(&dcon->switch_source, dcon_source_switch);
599 dcon->reboot_nb.notifier_call = dcon_reboot_notify;
600 dcon->reboot_nb.priority = -1;
601
602 i2c_set_clientdata(client, dcon);
603
604 if (num_registered_fb < 1) {
605 dev_err(&client->dev, "DCON driver requires a registered fb\n");
606 rc = -EIO;
607 goto einit;
608 }
609 dcon->fbinfo = registered_fb[0];
610
611 rc = dcon_hw_init(dcon, 1);
612 if (rc)
613 goto einit;
614
615 /* Add the DCON device */
616
617 dcon_device = platform_device_alloc("dcon", -1);
618
619 if (!dcon_device) {
620 pr_err("Unable to create the DCON device\n");
621 rc = -ENOMEM;
622 goto eirq;
623 }
624 rc = platform_device_add(dcon_device);
625 platform_set_drvdata(dcon_device, dcon);
626
627 if (rc) {
628 pr_err("Unable to add the DCON device\n");
629 goto edev;
630 }
631
632 for (i = 0; i < ARRAY_SIZE(dcon_device_files); i++) {
633 rc = device_create_file(&dcon_device->dev,
634 &dcon_device_files[i]);
635 if (rc) {
636 dev_err(&dcon_device->dev, "Cannot create sysfs file\n");
637 goto ecreate;
638 }
639 }
640
641 dcon->bl_val = dcon_read(dcon, DCON_REG_BRIGHT) & 0x0F;
642
643 /* Add the backlight device for the DCON */
644 dcon_bl_props.brightness = dcon->bl_val;
645 dcon->bl_dev = backlight_device_register("dcon-bl", &dcon_device->dev,
646 dcon, &dcon_bl_ops, &dcon_bl_props);
647 if (IS_ERR(dcon->bl_dev)) {
648 dev_err(&client->dev, "cannot register backlight dev (%ld)\n",
649 PTR_ERR(dcon->bl_dev));
650 dcon->bl_dev = NULL;
651 }
652
653 register_reboot_notifier(&dcon->reboot_nb);
654 atomic_notifier_chain_register(&panic_notifier_list, &dcon_panic_nb);
655
656 return 0;
657
658 ecreate:
659 for (j = 0; j < i; j++)
660 device_remove_file(&dcon_device->dev, &dcon_device_files[j]);
661 edev:
662 platform_device_unregister(dcon_device);
663 dcon_device = NULL;
664 eirq:
665 free_irq(DCON_IRQ, dcon);
666 einit:
667 kfree(dcon);
668 return rc;
669}
670
671static int dcon_remove(struct i2c_client *client)
672{
673 struct dcon_priv *dcon = i2c_get_clientdata(client);
674
675 unregister_reboot_notifier(&dcon->reboot_nb);
676 atomic_notifier_chain_unregister(&panic_notifier_list, &dcon_panic_nb);
677
678 free_irq(DCON_IRQ, dcon);
679
680 backlight_device_unregister(dcon->bl_dev);
681
682 if (dcon_device)
683 platform_device_unregister(dcon_device);
684 cancel_work_sync(&dcon->switch_source);
685
686 kfree(dcon);
687
688 return 0;
689}
690
691#ifdef CONFIG_PM
692static int dcon_suspend(struct device *dev)
693{
694 struct i2c_client *client = to_i2c_client(dev);
695 struct dcon_priv *dcon = i2c_get_clientdata(client);
696
697 if (!dcon->asleep) {
698 /* Set up the DCON to have the source */
699 dcon_set_source_sync(dcon, DCON_SOURCE_DCON);
700 }
701
702 return 0;
703}
704
705static int dcon_resume(struct device *dev)
706{
707 struct i2c_client *client = to_i2c_client(dev);
708 struct dcon_priv *dcon = i2c_get_clientdata(client);
709
710 if (!dcon->asleep) {
711 dcon_bus_stabilize(dcon, 0);
712 dcon_set_source(dcon, DCON_SOURCE_CPU);
713 }
714
715 return 0;
716}
717
718#else
719
720#define dcon_suspend NULL
721#define dcon_resume NULL
722
723#endif /* CONFIG_PM */
724
725irqreturn_t dcon_interrupt(int irq, void *id)
726{
727 struct dcon_priv *dcon = id;
728 u8 status;
729
730 if (pdata->read_status(&status))
731 return IRQ_NONE;
732
733 switch (status & 3) {
734 case 3:
735 pr_debug("DCONLOAD_MISSED interrupt\n");
736 break;
737
738 case 2: /* switch to DCON mode */
739 case 1: /* switch to CPU mode */
740 dcon->switched = true;
741 dcon->irq_time = ktime_get();
742 wake_up(&dcon->waitq);
743 break;
744
745 case 0:
746 /* workaround resume case: the DCON (on 1.5) doesn't
747 * ever assert status 0x01 when switching to CPU mode
748 * during resume. this is because DCONLOAD is de-asserted
749 * _immediately_ upon exiting S3, so the actual release
750 * of the DCON happened long before this point.
751 * see http://dev.laptop.org/ticket/9869
752 */
753 if (dcon->curr_src != dcon->pending_src && !dcon->switched) {
754 dcon->switched = true;
755 dcon->irq_time = ktime_get();
756 wake_up(&dcon->waitq);
757 pr_debug("switching w/ status 0/0\n");
758 } else {
759 pr_debug("scanline interrupt w/CPU\n");
760 }
761 }
762
763 return IRQ_HANDLED;
764}
765
766static const struct dev_pm_ops dcon_pm_ops = {
767 .suspend = dcon_suspend,
768 .resume = dcon_resume,
769};
770
771static const struct i2c_device_id dcon_idtable[] = {
772 { "olpc_dcon", 0 },
773 { }
774};
775MODULE_DEVICE_TABLE(i2c, dcon_idtable);
776
777static struct i2c_driver dcon_driver = {
778 .driver = {
779 .name = "olpc_dcon",
780 .pm = &dcon_pm_ops,
781 },
782 .class = I2C_CLASS_DDC | I2C_CLASS_HWMON,
783 .id_table = dcon_idtable,
784 .probe = dcon_probe,
785 .remove = dcon_remove,
786 .detect = dcon_detect,
787 .address_list = normal_i2c,
788};
789
790static int __init olpc_dcon_init(void)
791{
792#ifdef CONFIG_FB_OLPC_DCON_1_5
793 /* XO-1.5 */
794 if (olpc_board_at_least(olpc_board(0xd0)))
795 pdata = &dcon_pdata_xo_1_5;
796#endif
797#ifdef CONFIG_FB_OLPC_DCON_1
798 if (!pdata)
799 pdata = &dcon_pdata_xo_1;
800#endif
801
802 return i2c_add_driver(&dcon_driver);
803}
804
805static void __exit olpc_dcon_exit(void)
806{
807 i2c_del_driver(&dcon_driver);
808}
809
810module_init(olpc_dcon_init);
811module_exit(olpc_dcon_exit);
812
813MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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