Commit | Line | Data |
---|---|---|
c28b6699 | 1 | // SPDX-License-Identifier: GPL-2.0 |
53c43c5c GKH |
2 | /* |
3 | * Mainly by David Woodhouse, somewhat modified by Jordan Crouse | |
4 | * | |
5 | * Copyright © 2006-2007 Red Hat, Inc. | |
6 | * Copyright © 2006-2007 Advanced Micro Devices, Inc. | |
7 | * Copyright © 2009 VIA Technology, Inc. | |
8 | * Copyright (c) 2010-2011 Andres Salomon <dilinger@queued.net> | |
53c43c5c GKH |
9 | */ |
10 | ||
11 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
12 | ||
13 | #include <linux/kernel.h> | |
14 | #include <linux/fb.h> | |
15 | #include <linux/console.h> | |
16 | #include <linux/i2c.h> | |
17 | #include <linux/platform_device.h> | |
18 | #include <linux/interrupt.h> | |
19 | #include <linux/delay.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/backlight.h> | |
22 | #include <linux/device.h> | |
23 | #include <linux/uaccess.h> | |
24 | #include <linux/ctype.h> | |
f39650de | 25 | #include <linux/panic_notifier.h> |
53c43c5c GKH |
26 | #include <linux/reboot.h> |
27 | #include <linux/olpc-ec.h> | |
28 | #include <asm/tsc.h> | |
29 | #include <asm/olpc.h> | |
30 | ||
31 | #include "olpc_dcon.h" | |
32 | ||
33 | /* Module definitions */ | |
34 | ||
35 | static ushort resumeline = 898; | |
36 | module_param(resumeline, ushort, 0444); | |
37 | ||
38 | static struct dcon_platform_data *pdata; | |
39 | ||
40 | /* I2C structures */ | |
41 | ||
42 | /* Platform devices */ | |
43 | static struct platform_device *dcon_device; | |
44 | ||
45 | static unsigned short normal_i2c[] = { 0x0d, I2C_CLIENT_END }; | |
46 | ||
47 | static s32 dcon_write(struct dcon_priv *dcon, u8 reg, u16 val) | |
48 | { | |
49 | return i2c_smbus_write_word_data(dcon->client, reg, val); | |
50 | } | |
51 | ||
52 | static s32 dcon_read(struct dcon_priv *dcon, u8 reg) | |
53 | { | |
54 | return i2c_smbus_read_word_data(dcon->client, reg); | |
55 | } | |
56 | ||
57 | /* ===== API functions - these are called by a variety of users ==== */ | |
58 | ||
59 | static int dcon_hw_init(struct dcon_priv *dcon, int is_init) | |
60 | { | |
61 | u16 ver; | |
62 | int rc = 0; | |
63 | ||
64 | ver = dcon_read(dcon, DCON_REG_ID); | |
65 | if ((ver >> 8) != 0xDC) { | |
66 | pr_err("DCON ID not 0xDCxx: 0x%04x instead.\n", ver); | |
67 | rc = -ENXIO; | |
68 | goto err; | |
69 | } | |
70 | ||
71 | if (is_init) { | |
72 | pr_info("Discovered DCON version %x\n", ver & 0xFF); | |
73 | rc = pdata->init(dcon); | |
74 | if (rc != 0) { | |
75 | pr_err("Unable to init.\n"); | |
76 | goto err; | |
77 | } | |
78 | } | |
79 | ||
80 | if (ver < 0xdc02) { | |
81 | dev_err(&dcon->client->dev, | |
5f6791ec | 82 | "DCON v1 is unsupported, giving up..\n"); |
53c43c5c GKH |
83 | rc = -ENODEV; |
84 | goto err; | |
85 | } | |
86 | ||
87 | /* SDRAM setup/hold time */ | |
88 | dcon_write(dcon, 0x3a, 0xc040); | |
89 | dcon_write(dcon, DCON_REG_MEM_OPT_A, 0x0000); /* clear option bits */ | |
90 | dcon_write(dcon, DCON_REG_MEM_OPT_A, | |
5f6791ec | 91 | MEM_DLL_CLOCK_DELAY | MEM_POWER_DOWN); |
53c43c5c GKH |
92 | dcon_write(dcon, DCON_REG_MEM_OPT_B, MEM_SOFT_RESET); |
93 | ||
94 | /* Colour swizzle, AA, no passthrough, backlight */ | |
95 | if (is_init) { | |
96 | dcon->disp_mode = MODE_PASSTHRU | MODE_BL_ENABLE | | |
97 | MODE_CSWIZZLE | MODE_COL_AA; | |
98 | } | |
99 | dcon_write(dcon, DCON_REG_MODE, dcon->disp_mode); | |
100 | ||
101 | /* Set the scanline to interrupt on during resume */ | |
102 | dcon_write(dcon, DCON_REG_SCAN_INT, resumeline); | |
103 | ||
104 | err: | |
105 | return rc; | |
106 | } | |
107 | ||
108 | /* | |
109 | * The smbus doesn't always come back due to what is believed to be | |
110 | * hardware (power rail) bugs. For older models where this is known to | |
111 | * occur, our solution is to attempt to wait for the bus to stabilize; | |
112 | * if it doesn't happen, cut power to the dcon, repower it, and wait | |
113 | * for the bus to stabilize. Rinse, repeat until we have a working | |
114 | * smbus. For newer models, we simply BUG(); we want to know if this | |
115 | * still happens despite the power fixes that have been made! | |
116 | */ | |
117 | static int dcon_bus_stabilize(struct dcon_priv *dcon, int is_powered_down) | |
118 | { | |
119 | unsigned long timeout; | |
120 | u8 pm; | |
121 | int x; | |
122 | ||
123 | power_up: | |
124 | if (is_powered_down) { | |
125 | pm = 1; | |
126 | x = olpc_ec_cmd(EC_DCON_POWER_MODE, &pm, 1, NULL, 0); | |
127 | if (x) { | |
128 | pr_warn("unable to force dcon to power up: %d!\n", x); | |
129 | return x; | |
130 | } | |
131 | usleep_range(10000, 11000); /* we'll be conservative */ | |
132 | } | |
133 | ||
134 | pdata->bus_stabilize_wiggle(); | |
135 | ||
136 | for (x = -1, timeout = 50; timeout && x < 0; timeout--) { | |
137 | usleep_range(1000, 1100); | |
138 | x = dcon_read(dcon, DCON_REG_ID); | |
139 | } | |
140 | if (x < 0) { | |
141 | pr_err("unable to stabilize dcon's smbus, reasserting power and praying.\n"); | |
142 | BUG_ON(olpc_board_at_least(olpc_board(0xc2))); | |
143 | pm = 0; | |
144 | olpc_ec_cmd(EC_DCON_POWER_MODE, &pm, 1, NULL, 0); | |
145 | msleep(100); | |
146 | is_powered_down = 1; | |
147 | goto power_up; /* argh, stupid hardware.. */ | |
148 | } | |
149 | ||
150 | if (is_powered_down) | |
151 | return dcon_hw_init(dcon, 0); | |
152 | return 0; | |
153 | } | |
154 | ||
155 | static void dcon_set_backlight(struct dcon_priv *dcon, u8 level) | |
156 | { | |
157 | dcon->bl_val = level; | |
158 | dcon_write(dcon, DCON_REG_BRIGHT, dcon->bl_val); | |
159 | ||
160 | /* Purposely turn off the backlight when we go to level 0 */ | |
161 | if (dcon->bl_val == 0) { | |
162 | dcon->disp_mode &= ~MODE_BL_ENABLE; | |
163 | dcon_write(dcon, DCON_REG_MODE, dcon->disp_mode); | |
164 | } else if (!(dcon->disp_mode & MODE_BL_ENABLE)) { | |
165 | dcon->disp_mode |= MODE_BL_ENABLE; | |
166 | dcon_write(dcon, DCON_REG_MODE, dcon->disp_mode); | |
167 | } | |
168 | } | |
169 | ||
170 | /* Set the output type to either color or mono */ | |
171 | static int dcon_set_mono_mode(struct dcon_priv *dcon, bool enable_mono) | |
172 | { | |
173 | if (dcon->mono == enable_mono) | |
174 | return 0; | |
175 | ||
176 | dcon->mono = enable_mono; | |
177 | ||
178 | if (enable_mono) { | |
179 | dcon->disp_mode &= ~(MODE_CSWIZZLE | MODE_COL_AA); | |
180 | dcon->disp_mode |= MODE_MONO_LUMA; | |
181 | } else { | |
182 | dcon->disp_mode &= ~(MODE_MONO_LUMA); | |
183 | dcon->disp_mode |= MODE_CSWIZZLE | MODE_COL_AA; | |
184 | } | |
185 | ||
186 | dcon_write(dcon, DCON_REG_MODE, dcon->disp_mode); | |
187 | return 0; | |
188 | } | |
189 | ||
190 | /* For now, this will be really stupid - we need to address how | |
191 | * DCONLOAD works in a sleep and account for it accordingly | |
192 | */ | |
193 | ||
194 | static void dcon_sleep(struct dcon_priv *dcon, bool sleep) | |
195 | { | |
196 | int x; | |
197 | ||
198 | /* Turn off the backlight and put the DCON to sleep */ | |
199 | ||
200 | if (dcon->asleep == sleep) | |
201 | return; | |
202 | ||
203 | if (!olpc_board_at_least(olpc_board(0xc2))) | |
204 | return; | |
205 | ||
206 | if (sleep) { | |
207 | u8 pm = 0; | |
208 | ||
209 | x = olpc_ec_cmd(EC_DCON_POWER_MODE, &pm, 1, NULL, 0); | |
210 | if (x) | |
211 | pr_warn("unable to force dcon to power down: %d!\n", x); | |
212 | else | |
213 | dcon->asleep = sleep; | |
214 | } else { | |
215 | /* Only re-enable the backlight if the backlight value is set */ | |
216 | if (dcon->bl_val != 0) | |
217 | dcon->disp_mode |= MODE_BL_ENABLE; | |
218 | x = dcon_bus_stabilize(dcon, 1); | |
219 | if (x) | |
220 | pr_warn("unable to reinit dcon hardware: %d!\n", x); | |
221 | else | |
222 | dcon->asleep = sleep; | |
223 | ||
224 | /* Restore backlight */ | |
225 | dcon_set_backlight(dcon, dcon->bl_val); | |
226 | } | |
227 | ||
228 | /* We should turn off some stuff in the framebuffer - but what? */ | |
229 | } | |
230 | ||
231 | /* the DCON seems to get confused if we change DCONLOAD too | |
232 | * frequently -- i.e., approximately faster than frame time. | |
233 | * normally we don't change it this fast, so in general we won't | |
234 | * delay here. | |
235 | */ | |
236 | static void dcon_load_holdoff(struct dcon_priv *dcon) | |
237 | { | |
238 | ktime_t delta_t, now; | |
239 | ||
240 | while (1) { | |
241 | now = ktime_get(); | |
242 | delta_t = ktime_sub(now, dcon->load_time); | |
243 | if (ktime_to_ns(delta_t) > NSEC_PER_MSEC * 20) | |
244 | break; | |
245 | mdelay(4); | |
246 | } | |
247 | } | |
248 | ||
249 | static bool dcon_blank_fb(struct dcon_priv *dcon, bool blank) | |
250 | { | |
251 | int err; | |
252 | ||
253 | console_lock(); | |
9ef37392 | 254 | lock_fb_info(dcon->fbinfo); |
53c43c5c GKH |
255 | |
256 | dcon->ignore_fb_events = true; | |
257 | err = fb_blank(dcon->fbinfo, | |
5f6791ec | 258 | blank ? FB_BLANK_POWERDOWN : FB_BLANK_UNBLANK); |
53c43c5c GKH |
259 | dcon->ignore_fb_events = false; |
260 | unlock_fb_info(dcon->fbinfo); | |
261 | console_unlock(); | |
262 | ||
263 | if (err) { | |
264 | dev_err(&dcon->client->dev, "couldn't %sblank framebuffer\n", | |
5f6791ec | 265 | blank ? "" : "un"); |
53c43c5c GKH |
266 | return false; |
267 | } | |
268 | return true; | |
269 | } | |
270 | ||
271 | /* Set the source of the display (CPU or DCON) */ | |
272 | static void dcon_source_switch(struct work_struct *work) | |
273 | { | |
274 | struct dcon_priv *dcon = container_of(work, struct dcon_priv, | |
275 | switch_source); | |
276 | int source = dcon->pending_src; | |
277 | ||
278 | if (dcon->curr_src == source) | |
279 | return; | |
280 | ||
281 | dcon_load_holdoff(dcon); | |
282 | ||
283 | dcon->switched = false; | |
284 | ||
285 | switch (source) { | |
286 | case DCON_SOURCE_CPU: | |
0c8f4650 | 287 | pr_info("%s to CPU\n", __func__); |
53c43c5c GKH |
288 | /* Enable the scanline interrupt bit */ |
289 | if (dcon_write(dcon, DCON_REG_MODE, | |
5f6791ec | 290 | dcon->disp_mode | MODE_SCAN_INT)) |
53c43c5c GKH |
291 | pr_err("couldn't enable scanline interrupt!\n"); |
292 | else | |
293 | /* Wait up to one second for the scanline interrupt */ | |
294 | wait_event_timeout(dcon->waitq, dcon->switched, HZ); | |
295 | ||
296 | if (!dcon->switched) | |
297 | pr_err("Timeout entering CPU mode; expect a screen glitch.\n"); | |
298 | ||
299 | /* Turn off the scanline interrupt */ | |
300 | if (dcon_write(dcon, DCON_REG_MODE, dcon->disp_mode)) | |
301 | pr_err("couldn't disable scanline interrupt!\n"); | |
302 | ||
303 | /* | |
304 | * Ideally we'd like to disable interrupts here so that the | |
305 | * fb unblanking and DCON turn on happen at a known time value; | |
306 | * however, we can't do that right now with fb_blank | |
307 | * messing with semaphores. | |
308 | * | |
309 | * For now, we just hope.. | |
310 | */ | |
311 | if (!dcon_blank_fb(dcon, false)) { | |
312 | pr_err("Failed to enter CPU mode\n"); | |
313 | dcon->pending_src = DCON_SOURCE_DCON; | |
314 | return; | |
315 | } | |
316 | ||
317 | /* And turn off the DCON */ | |
318 | pdata->set_dconload(1); | |
319 | dcon->load_time = ktime_get(); | |
320 | ||
321 | pr_info("The CPU has control\n"); | |
322 | break; | |
323 | case DCON_SOURCE_DCON: | |
324 | { | |
325 | ktime_t delta_t; | |
326 | ||
0c8f4650 | 327 | pr_info("%s to DCON\n", __func__); |
53c43c5c GKH |
328 | |
329 | /* Clear DCONLOAD - this implies that the DCON is in control */ | |
330 | pdata->set_dconload(0); | |
331 | dcon->load_time = ktime_get(); | |
332 | ||
8862ce68 | 333 | wait_event_timeout(dcon->waitq, dcon->switched, HZ / 2); |
53c43c5c GKH |
334 | |
335 | if (!dcon->switched) { | |
336 | pr_err("Timeout entering DCON mode; expect a screen glitch.\n"); | |
337 | } else { | |
338 | /* sometimes the DCON doesn't follow its own rules, | |
339 | * and doesn't wait for two vsync pulses before | |
340 | * ack'ing the frame load with an IRQ. the result | |
341 | * is that the display shows the *previously* | |
342 | * loaded frame. we can detect this by looking at | |
343 | * the time between asserting DCONLOAD and the IRQ -- | |
344 | * if it's less than 20msec, then the DCON couldn't | |
345 | * have seen two VSYNC pulses. in that case we | |
346 | * deassert and reassert, and hope for the best. | |
347 | * see http://dev.laptop.org/ticket/9664 | |
348 | */ | |
349 | delta_t = ktime_sub(dcon->irq_time, dcon->load_time); | |
350 | if (dcon->switched && ktime_to_ns(delta_t) | |
351 | < NSEC_PER_MSEC * 20) { | |
352 | pr_err("missed loading, retrying\n"); | |
353 | pdata->set_dconload(1); | |
354 | mdelay(41); | |
355 | pdata->set_dconload(0); | |
356 | dcon->load_time = ktime_get(); | |
357 | mdelay(41); | |
358 | } | |
359 | } | |
360 | ||
361 | dcon_blank_fb(dcon, true); | |
362 | pr_info("The DCON has control\n"); | |
363 | break; | |
364 | } | |
365 | default: | |
366 | BUG(); | |
367 | } | |
368 | ||
369 | dcon->curr_src = source; | |
370 | } | |
371 | ||
372 | static void dcon_set_source(struct dcon_priv *dcon, int arg) | |
373 | { | |
374 | if (dcon->pending_src == arg) | |
375 | return; | |
376 | ||
377 | dcon->pending_src = arg; | |
378 | ||
379 | if (dcon->curr_src != arg) | |
380 | schedule_work(&dcon->switch_source); | |
381 | } | |
382 | ||
383 | static void dcon_set_source_sync(struct dcon_priv *dcon, int arg) | |
384 | { | |
385 | dcon_set_source(dcon, arg); | |
4bbdc208 | 386 | flush_work(&dcon->switch_source); |
53c43c5c GKH |
387 | } |
388 | ||
389 | static ssize_t dcon_mode_show(struct device *dev, | |
848d9eab ZM |
390 | struct device_attribute *attr, |
391 | char *buf) | |
53c43c5c GKH |
392 | { |
393 | struct dcon_priv *dcon = dev_get_drvdata(dev); | |
394 | ||
395 | return sprintf(buf, "%4.4X\n", dcon->disp_mode); | |
396 | } | |
397 | ||
398 | static ssize_t dcon_sleep_show(struct device *dev, | |
848d9eab ZM |
399 | struct device_attribute *attr, |
400 | char *buf) | |
53c43c5c GKH |
401 | { |
402 | struct dcon_priv *dcon = dev_get_drvdata(dev); | |
403 | ||
404 | return sprintf(buf, "%d\n", dcon->asleep); | |
405 | } | |
406 | ||
407 | static ssize_t dcon_freeze_show(struct device *dev, | |
848d9eab ZM |
408 | struct device_attribute *attr, |
409 | char *buf) | |
53c43c5c GKH |
410 | { |
411 | struct dcon_priv *dcon = dev_get_drvdata(dev); | |
412 | ||
413 | return sprintf(buf, "%d\n", dcon->curr_src == DCON_SOURCE_DCON ? 1 : 0); | |
414 | } | |
415 | ||
416 | static ssize_t dcon_mono_show(struct device *dev, | |
848d9eab ZM |
417 | struct device_attribute *attr, |
418 | char *buf) | |
53c43c5c GKH |
419 | { |
420 | struct dcon_priv *dcon = dev_get_drvdata(dev); | |
421 | ||
422 | return sprintf(buf, "%d\n", dcon->mono); | |
423 | } | |
424 | ||
425 | static ssize_t dcon_resumeline_show(struct device *dev, | |
848d9eab ZM |
426 | struct device_attribute *attr, |
427 | char *buf) | |
53c43c5c GKH |
428 | { |
429 | return sprintf(buf, "%d\n", resumeline); | |
430 | } | |
431 | ||
432 | static ssize_t dcon_mono_store(struct device *dev, | |
848d9eab ZM |
433 | struct device_attribute *attr, |
434 | const char *buf, size_t count) | |
53c43c5c GKH |
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 | ||
448 | static ssize_t dcon_freeze_store(struct device *dev, | |
848d9eab ZM |
449 | struct device_attribute *attr, |
450 | const char *buf, size_t count) | |
53c43c5c GKH |
451 | { |
452 | struct dcon_priv *dcon = dev_get_drvdata(dev); | |
453 | unsigned long output; | |
454 | int ret; | |
455 | ||
456 | ret = kstrtoul(buf, 10, &output); | |
457 | if (ret) | |
458 | return ret; | |
459 | ||
53c43c5c GKH |
460 | switch (output) { |
461 | case 0: | |
462 | dcon_set_source(dcon, DCON_SOURCE_CPU); | |
463 | break; | |
464 | case 1: | |
465 | dcon_set_source_sync(dcon, DCON_SOURCE_DCON); | |
466 | break; | |
467 | case 2: /* normally unused */ | |
468 | dcon_set_source(dcon, DCON_SOURCE_DCON); | |
469 | break; | |
470 | default: | |
471 | return -EINVAL; | |
472 | } | |
473 | ||
474 | return count; | |
475 | } | |
476 | ||
477 | static ssize_t dcon_resumeline_store(struct device *dev, | |
848d9eab ZM |
478 | struct device_attribute *attr, |
479 | const char *buf, size_t count) | |
53c43c5c GKH |
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 | ||
494 | static ssize_t dcon_sleep_store(struct device *dev, | |
848d9eab ZM |
495 | struct device_attribute *attr, |
496 | const char *buf, size_t count) | |
53c43c5c GKH |
497 | { |
498 | unsigned long output; | |
499 | int ret; | |
500 | ||
501 | ret = kstrtoul(buf, 10, &output); | |
502 | if (ret) | |
503 | return ret; | |
504 | ||
505 | dcon_sleep(dev_get_drvdata(dev), output ? true : false); | |
506 | return count; | |
507 | } | |
508 | ||
509 | static struct device_attribute dcon_device_files[] = { | |
510 | __ATTR(mode, 0444, dcon_mode_show, NULL), | |
511 | __ATTR(sleep, 0644, dcon_sleep_show, dcon_sleep_store), | |
512 | __ATTR(freeze, 0644, dcon_freeze_show, dcon_freeze_store), | |
513 | __ATTR(monochrome, 0644, dcon_mono_show, dcon_mono_store), | |
514 | __ATTR(resumeline, 0644, dcon_resumeline_show, dcon_resumeline_store), | |
515 | }; | |
516 | ||
517 | static int dcon_bl_update(struct backlight_device *dev) | |
518 | { | |
519 | struct dcon_priv *dcon = bl_get_data(dev); | |
72aef4f6 | 520 | u8 level = backlight_get_brightness(dev) & 0x0F; |
53c43c5c GKH |
521 | |
522 | if (level != dcon->bl_val) | |
523 | dcon_set_backlight(dcon, level); | |
524 | ||
525 | /* power down the DCON when the screen is blanked */ | |
526 | if (!dcon->ignore_fb_events) | |
527 | dcon_sleep(dcon, !!(dev->props.state & BL_CORE_FBBLANK)); | |
528 | ||
529 | return 0; | |
530 | } | |
531 | ||
532 | static int dcon_bl_get(struct backlight_device *dev) | |
533 | { | |
534 | struct dcon_priv *dcon = bl_get_data(dev); | |
535 | ||
536 | return dcon->bl_val; | |
537 | } | |
538 | ||
539 | static const struct backlight_ops dcon_bl_ops = { | |
540 | .update_status = dcon_bl_update, | |
541 | .get_brightness = dcon_bl_get, | |
542 | }; | |
543 | ||
544 | static struct backlight_properties dcon_bl_props = { | |
545 | .max_brightness = 15, | |
546 | .type = BACKLIGHT_RAW, | |
547 | .power = FB_BLANK_UNBLANK, | |
548 | }; | |
549 | ||
550 | static int dcon_reboot_notify(struct notifier_block *nb, | |
551 | unsigned long foo, void *bar) | |
552 | { | |
553 | struct dcon_priv *dcon = container_of(nb, struct dcon_priv, reboot_nb); | |
554 | ||
555 | if (!dcon || !dcon->client) | |
556 | return NOTIFY_DONE; | |
557 | ||
558 | /* Turn off the DCON. Entirely. */ | |
559 | dcon_write(dcon, DCON_REG_MODE, 0x39); | |
560 | dcon_write(dcon, DCON_REG_MODE, 0x32); | |
561 | return NOTIFY_DONE; | |
562 | } | |
563 | ||
564 | static int unfreeze_on_panic(struct notifier_block *nb, | |
565 | unsigned long e, void *p) | |
566 | { | |
567 | pdata->set_dconload(1); | |
568 | return NOTIFY_DONE; | |
569 | } | |
570 | ||
571 | static struct notifier_block dcon_panic_nb = { | |
572 | .notifier_call = unfreeze_on_panic, | |
573 | }; | |
574 | ||
575 | static int dcon_detect(struct i2c_client *client, struct i2c_board_info *info) | |
576 | { | |
3381583f | 577 | strscpy(info->type, "olpc_dcon", I2C_NAME_SIZE); |
53c43c5c GKH |
578 | |
579 | return 0; | |
580 | } | |
581 | ||
b6264982 | 582 | static int dcon_probe(struct i2c_client *client) |
53c43c5c GKH |
583 | { |
584 | struct dcon_priv *dcon; | |
585 | int rc, i, j; | |
586 | ||
587 | if (!pdata) | |
588 | return -ENXIO; | |
589 | ||
590 | dcon = kzalloc(sizeof(*dcon), GFP_KERNEL); | |
591 | if (!dcon) | |
592 | return -ENOMEM; | |
593 | ||
594 | dcon->client = client; | |
595 | init_waitqueue_head(&dcon->waitq); | |
596 | INIT_WORK(&dcon->switch_source, dcon_source_switch); | |
597 | dcon->reboot_nb.notifier_call = dcon_reboot_notify; | |
598 | dcon->reboot_nb.priority = -1; | |
599 | ||
600 | i2c_set_clientdata(client, dcon); | |
601 | ||
602 | if (num_registered_fb < 1) { | |
603 | dev_err(&client->dev, "DCON driver requires a registered fb\n"); | |
604 | rc = -EIO; | |
605 | goto einit; | |
606 | } | |
607 | dcon->fbinfo = registered_fb[0]; | |
608 | ||
609 | rc = dcon_hw_init(dcon, 1); | |
610 | if (rc) | |
611 | goto einit; | |
612 | ||
613 | /* Add the DCON device */ | |
614 | ||
615 | dcon_device = platform_device_alloc("dcon", -1); | |
616 | ||
617 | if (!dcon_device) { | |
618 | pr_err("Unable to create the DCON device\n"); | |
619 | rc = -ENOMEM; | |
620 | goto eirq; | |
621 | } | |
622 | rc = platform_device_add(dcon_device); | |
623 | platform_set_drvdata(dcon_device, dcon); | |
624 | ||
625 | if (rc) { | |
626 | pr_err("Unable to add the DCON device\n"); | |
627 | goto edev; | |
628 | } | |
629 | ||
630 | for (i = 0; i < ARRAY_SIZE(dcon_device_files); i++) { | |
631 | rc = device_create_file(&dcon_device->dev, | |
632 | &dcon_device_files[i]); | |
633 | if (rc) { | |
634 | dev_err(&dcon_device->dev, "Cannot create sysfs file\n"); | |
635 | goto ecreate; | |
636 | } | |
637 | } | |
638 | ||
639 | dcon->bl_val = dcon_read(dcon, DCON_REG_BRIGHT) & 0x0F; | |
640 | ||
641 | /* Add the backlight device for the DCON */ | |
642 | dcon_bl_props.brightness = dcon->bl_val; | |
643 | dcon->bl_dev = backlight_device_register("dcon-bl", &dcon_device->dev, | |
848d9eab ZM |
644 | dcon, &dcon_bl_ops, |
645 | &dcon_bl_props); | |
53c43c5c GKH |
646 | if (IS_ERR(dcon->bl_dev)) { |
647 | dev_err(&client->dev, "cannot register backlight dev (%ld)\n", | |
5f6791ec | 648 | PTR_ERR(dcon->bl_dev)); |
53c43c5c GKH |
649 | dcon->bl_dev = NULL; |
650 | } | |
651 | ||
652 | register_reboot_notifier(&dcon->reboot_nb); | |
653 | atomic_notifier_chain_register(&panic_notifier_list, &dcon_panic_nb); | |
654 | ||
655 | return 0; | |
656 | ||
657 | ecreate: | |
658 | for (j = 0; j < i; j++) | |
659 | device_remove_file(&dcon_device->dev, &dcon_device_files[j]); | |
4996b461 | 660 | platform_device_del(dcon_device); |
53c43c5c | 661 | edev: |
4996b461 | 662 | platform_device_put(dcon_device); |
53c43c5c GKH |
663 | dcon_device = NULL; |
664 | eirq: | |
665 | free_irq(DCON_IRQ, dcon); | |
666 | einit: | |
667 | kfree(dcon); | |
668 | return rc; | |
669 | } | |
670 | ||
ed5c2f5f | 671 | static void dcon_remove(struct i2c_client *client) |
53c43c5c GKH |
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); | |
53c43c5c GKH |
687 | } |
688 | ||
689 | #ifdef CONFIG_PM | |
690 | static int dcon_suspend(struct device *dev) | |
691 | { | |
692 | struct i2c_client *client = to_i2c_client(dev); | |
693 | struct dcon_priv *dcon = i2c_get_clientdata(client); | |
694 | ||
695 | if (!dcon->asleep) { | |
696 | /* Set up the DCON to have the source */ | |
697 | dcon_set_source_sync(dcon, DCON_SOURCE_DCON); | |
698 | } | |
699 | ||
700 | return 0; | |
701 | } | |
702 | ||
703 | static int dcon_resume(struct device *dev) | |
704 | { | |
705 | struct i2c_client *client = to_i2c_client(dev); | |
706 | struct dcon_priv *dcon = i2c_get_clientdata(client); | |
707 | ||
708 | if (!dcon->asleep) { | |
709 | dcon_bus_stabilize(dcon, 0); | |
710 | dcon_set_source(dcon, DCON_SOURCE_CPU); | |
711 | } | |
712 | ||
713 | return 0; | |
714 | } | |
715 | ||
716 | #else | |
717 | ||
718 | #define dcon_suspend NULL | |
719 | #define dcon_resume NULL | |
720 | ||
721 | #endif /* CONFIG_PM */ | |
722 | ||
723 | irqreturn_t dcon_interrupt(int irq, void *id) | |
724 | { | |
725 | struct dcon_priv *dcon = id; | |
726 | u8 status; | |
727 | ||
728 | if (pdata->read_status(&status)) | |
729 | return IRQ_NONE; | |
730 | ||
731 | switch (status & 3) { | |
732 | case 3: | |
733 | pr_debug("DCONLOAD_MISSED interrupt\n"); | |
734 | break; | |
735 | ||
736 | case 2: /* switch to DCON mode */ | |
737 | case 1: /* switch to CPU mode */ | |
738 | dcon->switched = true; | |
739 | dcon->irq_time = ktime_get(); | |
740 | wake_up(&dcon->waitq); | |
741 | break; | |
742 | ||
743 | case 0: | |
744 | /* workaround resume case: the DCON (on 1.5) doesn't | |
745 | * ever assert status 0x01 when switching to CPU mode | |
746 | * during resume. this is because DCONLOAD is de-asserted | |
747 | * _immediately_ upon exiting S3, so the actual release | |
748 | * of the DCON happened long before this point. | |
749 | * see http://dev.laptop.org/ticket/9869 | |
750 | */ | |
751 | if (dcon->curr_src != dcon->pending_src && !dcon->switched) { | |
752 | dcon->switched = true; | |
753 | dcon->irq_time = ktime_get(); | |
754 | wake_up(&dcon->waitq); | |
755 | pr_debug("switching w/ status 0/0\n"); | |
756 | } else { | |
757 | pr_debug("scanline interrupt w/CPU\n"); | |
758 | } | |
759 | } | |
760 | ||
761 | return IRQ_HANDLED; | |
762 | } | |
763 | ||
764 | static const struct dev_pm_ops dcon_pm_ops = { | |
765 | .suspend = dcon_suspend, | |
766 | .resume = dcon_resume, | |
767 | }; | |
768 | ||
769 | static const struct i2c_device_id dcon_idtable[] = { | |
770 | { "olpc_dcon", 0 }, | |
771 | { } | |
772 | }; | |
773 | MODULE_DEVICE_TABLE(i2c, dcon_idtable); | |
774 | ||
775 | static struct i2c_driver dcon_driver = { | |
776 | .driver = { | |
777 | .name = "olpc_dcon", | |
778 | .pm = &dcon_pm_ops, | |
779 | }, | |
0210a684 | 780 | .class = I2C_CLASS_HWMON, |
53c43c5c | 781 | .id_table = dcon_idtable, |
28f5930b | 782 | .probe = dcon_probe, |
53c43c5c GKH |
783 | .remove = dcon_remove, |
784 | .detect = dcon_detect, | |
785 | .address_list = normal_i2c, | |
786 | }; | |
787 | ||
788 | static int __init olpc_dcon_init(void) | |
789 | { | |
53c43c5c GKH |
790 | /* XO-1.5 */ |
791 | if (olpc_board_at_least(olpc_board(0xd0))) | |
792 | pdata = &dcon_pdata_xo_1_5; | |
e40219d5 | 793 | else |
53c43c5c | 794 | pdata = &dcon_pdata_xo_1; |
53c43c5c GKH |
795 | |
796 | return i2c_add_driver(&dcon_driver); | |
797 | } | |
798 | ||
799 | static void __exit olpc_dcon_exit(void) | |
800 | { | |
801 | i2c_del_driver(&dcon_driver); | |
802 | } | |
803 | ||
804 | module_init(olpc_dcon_init); | |
805 | module_exit(olpc_dcon_exit); | |
806 | ||
807 | MODULE_LICENSE("GPL"); |