Commit | Line | Data |
---|---|---|
eecb3e4e AS |
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. | |
097cd83a | 7 | * Copyright (c) 2010-2011 Andres Salomon <dilinger@queued.net> |
eecb3e4e AS |
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 | ||
ac9bbd08 | 14 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
eecb3e4e AS |
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> | |
eecb3e4e | 21 | #include <linux/pci.h> |
eecb3e4e AS |
22 | #include <linux/pci_ids.h> |
23 | #include <linux/interrupt.h> | |
24 | #include <linux/delay.h> | |
99c97852 | 25 | #include <linux/module.h> |
eecb3e4e AS |
26 | #include <linux/backlight.h> |
27 | #include <linux/device.h> | |
e107e6eb | 28 | #include <linux/uaccess.h> |
eecb3e4e AS |
29 | #include <linux/ctype.h> |
30 | #include <linux/reboot.h> | |
3bf9428f | 31 | #include <linux/olpc-ec.h> |
eecb3e4e AS |
32 | #include <asm/tsc.h> |
33 | #include <asm/olpc.h> | |
34 | ||
35 | #include "olpc_dcon.h" | |
36 | ||
37 | /* Module definitions */ | |
38 | ||
c542341d VR |
39 | static ushort resumeline = 898; |
40 | module_param(resumeline, ushort, 0444); | |
eecb3e4e | 41 | |
eecb3e4e AS |
42 | /* Default off since it doesn't work on DCON ASIC in B-test OLPC board */ |
43 | static int useaa = 1; | |
44 | module_param(useaa, int, 0444); | |
45 | ||
eecb3e4e AS |
46 | static struct dcon_platform_data *pdata; |
47 | ||
48 | /* I2C structures */ | |
49 | ||
eecb3e4e AS |
50 | /* Platform devices */ |
51 | static struct platform_device *dcon_device; | |
52 | ||
eecb3e4e AS |
53 | static DECLARE_WAIT_QUEUE_HEAD(dcon_wait_queue); |
54 | ||
55 | static unsigned short normal_i2c[] = { 0x0d, I2C_CLIENT_END }; | |
56 | ||
8d2d3dd1 AS |
57 | static s32 dcon_write(struct dcon_priv *dcon, u8 reg, u16 val) |
58 | { | |
59 | return i2c_smbus_write_word_data(dcon->client, reg, val); | |
60 | } | |
61 | ||
62 | static s32 dcon_read(struct dcon_priv *dcon, u8 reg) | |
63 | { | |
64 | return i2c_smbus_read_word_data(dcon->client, reg); | |
65 | } | |
eecb3e4e | 66 | |
eecb3e4e AS |
67 | /* ===== API functions - these are called by a variety of users ==== */ |
68 | ||
8d2d3dd1 | 69 | static int dcon_hw_init(struct dcon_priv *dcon, int is_init) |
eecb3e4e AS |
70 | { |
71 | uint16_t ver; | |
72 | int rc = 0; | |
73 | ||
0b7a41eb | 74 | ver = dcon_read(dcon, DCON_REG_ID); |
eecb3e4e | 75 | if ((ver >> 8) != 0xDC) { |
ac9bbd08 | 76 | pr_err("DCON ID not 0xDCxx: 0x%04x instead.\n", ver); |
eecb3e4e AS |
77 | rc = -ENXIO; |
78 | goto err; | |
79 | } | |
80 | ||
81 | if (is_init) { | |
ac9bbd08 | 82 | pr_info("Discovered DCON version %x\n", ver & 0xFF); |
bbe963f1 | 83 | rc = pdata->init(dcon); |
e107e6eb | 84 | if (rc != 0) { |
ac9bbd08 | 85 | pr_err("Unable to init.\n"); |
eecb3e4e AS |
86 | goto err; |
87 | } | |
88 | } | |
89 | ||
24e26170 | 90 | if (ver < 0xdc02) { |
1b995ac2 AS |
91 | dev_err(&dcon->client->dev, |
92 | "DCON v1 is unsupported, giving up..\n"); | |
93 | rc = -ENODEV; | |
94 | goto err; | |
eecb3e4e AS |
95 | } |
96 | ||
1b995ac2 | 97 | /* SDRAM setup/hold time */ |
0b7a41eb AS |
98 | dcon_write(dcon, 0x3a, 0xc040); |
99 | dcon_write(dcon, 0x41, 0x0000); | |
100 | dcon_write(dcon, 0x41, 0x0101); | |
101 | dcon_write(dcon, 0x42, 0x0101); | |
1b995ac2 | 102 | |
eecb3e4e AS |
103 | /* Colour swizzle, AA, no passthrough, backlight */ |
104 | if (is_init) { | |
bada46e5 AS |
105 | dcon->disp_mode = MODE_PASSTHRU | MODE_BL_ENABLE | |
106 | MODE_CSWIZZLE; | |
eecb3e4e | 107 | if (useaa) |
bada46e5 | 108 | dcon->disp_mode |= MODE_COL_AA; |
eecb3e4e | 109 | } |
0b7a41eb | 110 | dcon_write(dcon, DCON_REG_MODE, dcon->disp_mode); |
eecb3e4e AS |
111 | |
112 | ||
113 | /* Set the scanline to interrupt on during resume */ | |
0b7a41eb | 114 | dcon_write(dcon, DCON_REG_SCAN_INT, resumeline); |
eecb3e4e AS |
115 | |
116 | err: | |
117 | return rc; | |
118 | } | |
119 | ||
120 | /* | |
121 | * The smbus doesn't always come back due to what is believed to be | |
122 | * hardware (power rail) bugs. For older models where this is known to | |
123 | * occur, our solution is to attempt to wait for the bus to stabilize; | |
124 | * if it doesn't happen, cut power to the dcon, repower it, and wait | |
125 | * for the bus to stabilize. Rinse, repeat until we have a working | |
126 | * smbus. For newer models, we simply BUG(); we want to know if this | |
127 | * still happens despite the power fixes that have been made! | |
128 | */ | |
8d2d3dd1 | 129 | static int dcon_bus_stabilize(struct dcon_priv *dcon, int is_powered_down) |
eecb3e4e AS |
130 | { |
131 | unsigned long timeout; | |
132 | int x; | |
133 | ||
134 | power_up: | |
135 | if (is_powered_down) { | |
136 | x = 1; | |
c2562687 | 137 | x = olpc_ec_cmd(0x26, (unsigned char *)&x, 1, NULL, 0); |
e107e6eb | 138 | if (x) { |
ac9bbd08 | 139 | pr_warn("unable to force dcon to power up: %d!\n", x); |
eecb3e4e AS |
140 | return x; |
141 | } | |
142 | msleep(10); /* we'll be conservative */ | |
143 | } | |
e107e6eb | 144 | |
eecb3e4e AS |
145 | pdata->bus_stabilize_wiggle(); |
146 | ||
147 | for (x = -1, timeout = 50; timeout && x < 0; timeout--) { | |
148 | msleep(1); | |
8d2d3dd1 | 149 | x = dcon_read(dcon, DCON_REG_ID); |
eecb3e4e AS |
150 | } |
151 | if (x < 0) { | |
ac9bbd08 | 152 | pr_err("unable to stabilize dcon's smbus, reasserting power and praying.\n"); |
316604be | 153 | BUG_ON(olpc_board_at_least(olpc_board(0xc2))); |
eecb3e4e | 154 | x = 0; |
c2562687 | 155 | olpc_ec_cmd(0x26, (unsigned char *)&x, 1, NULL, 0); |
eecb3e4e AS |
156 | msleep(100); |
157 | is_powered_down = 1; | |
158 | goto power_up; /* argh, stupid hardware.. */ | |
159 | } | |
160 | ||
161 | if (is_powered_down) | |
8d2d3dd1 | 162 | return dcon_hw_init(dcon, 0); |
eecb3e4e AS |
163 | return 0; |
164 | } | |
165 | ||
c59eef17 | 166 | static void dcon_set_backlight(struct dcon_priv *dcon, u8 level) |
eecb3e4e | 167 | { |
c59eef17 AS |
168 | dcon->bl_val = level; |
169 | dcon_write(dcon, DCON_REG_BRIGHT, dcon->bl_val); | |
eecb3e4e AS |
170 | |
171 | /* Purposely turn off the backlight when we go to level 0 */ | |
c59eef17 | 172 | if (dcon->bl_val == 0) { |
bada46e5 AS |
173 | dcon->disp_mode &= ~MODE_BL_ENABLE; |
174 | dcon_write(dcon, DCON_REG_MODE, dcon->disp_mode); | |
175 | } else if (!(dcon->disp_mode & MODE_BL_ENABLE)) { | |
176 | dcon->disp_mode |= MODE_BL_ENABLE; | |
177 | dcon_write(dcon, DCON_REG_MODE, dcon->disp_mode); | |
eecb3e4e AS |
178 | } |
179 | } | |
180 | ||
eecb3e4e | 181 | /* Set the output type to either color or mono */ |
bb410354 | 182 | static int dcon_set_mono_mode(struct dcon_priv *dcon, bool enable_mono) |
eecb3e4e | 183 | { |
bb410354 | 184 | if (dcon->mono == enable_mono) |
eecb3e4e AS |
185 | return 0; |
186 | ||
bb410354 | 187 | dcon->mono = enable_mono; |
eecb3e4e | 188 | |
bb410354 | 189 | if (enable_mono) { |
bada46e5 AS |
190 | dcon->disp_mode &= ~(MODE_CSWIZZLE | MODE_COL_AA); |
191 | dcon->disp_mode |= MODE_MONO_LUMA; | |
e107e6eb | 192 | } else { |
bada46e5 AS |
193 | dcon->disp_mode &= ~(MODE_MONO_LUMA); |
194 | dcon->disp_mode |= MODE_CSWIZZLE; | |
eecb3e4e | 195 | if (useaa) |
bada46e5 | 196 | dcon->disp_mode |= MODE_COL_AA; |
eecb3e4e AS |
197 | } |
198 | ||
bada46e5 | 199 | dcon_write(dcon, DCON_REG_MODE, dcon->disp_mode); |
eecb3e4e AS |
200 | return 0; |
201 | } | |
202 | ||
203 | /* For now, this will be really stupid - we need to address how | |
204 | * DCONLOAD works in a sleep and account for it accordingly | |
205 | */ | |
206 | ||
bada46e5 | 207 | static void dcon_sleep(struct dcon_priv *dcon, bool sleep) |
eecb3e4e AS |
208 | { |
209 | int x; | |
210 | ||
211 | /* Turn off the backlight and put the DCON to sleep */ | |
212 | ||
bada46e5 | 213 | if (dcon->asleep == sleep) |
eecb3e4e AS |
214 | return; |
215 | ||
316604be | 216 | if (!olpc_board_at_least(olpc_board(0xc2))) |
eecb3e4e AS |
217 | return; |
218 | ||
bada46e5 | 219 | if (sleep) { |
eecb3e4e | 220 | x = 0; |
c2562687 | 221 | x = olpc_ec_cmd(0x26, (unsigned char *)&x, 1, NULL, 0); |
e107e6eb | 222 | if (x) |
ac9bbd08 | 223 | pr_warn("unable to force dcon to power down: %d!\n", x); |
eecb3e4e | 224 | else |
bada46e5 | 225 | dcon->asleep = sleep; |
e107e6eb | 226 | } else { |
eecb3e4e | 227 | /* Only re-enable the backlight if the backlight value is set */ |
c59eef17 | 228 | if (dcon->bl_val != 0) |
bada46e5 | 229 | dcon->disp_mode |= MODE_BL_ENABLE; |
8d2d3dd1 | 230 | x = dcon_bus_stabilize(dcon, 1); |
e107e6eb | 231 | if (x) |
ac9bbd08 | 232 | pr_warn("unable to reinit dcon hardware: %d!\n", x); |
eecb3e4e | 233 | else |
bada46e5 | 234 | dcon->asleep = sleep; |
eecb3e4e AS |
235 | |
236 | /* Restore backlight */ | |
c59eef17 | 237 | dcon_set_backlight(dcon, dcon->bl_val); |
eecb3e4e AS |
238 | } |
239 | ||
240 | /* We should turn off some stuff in the framebuffer - but what? */ | |
241 | } | |
242 | ||
243 | /* the DCON seems to get confused if we change DCONLOAD too | |
e107e6eb | 244 | * frequently -- i.e., approximately faster than frame time. |
eecb3e4e AS |
245 | * normally we don't change it this fast, so in general we won't |
246 | * delay here. | |
247 | */ | |
309ef2a2 | 248 | static void dcon_load_holdoff(struct dcon_priv *dcon) |
eecb3e4e AS |
249 | { |
250 | struct timespec delta_t, now; | |
e107e6eb | 251 | while (1) { |
eecb3e4e | 252 | getnstimeofday(&now); |
309ef2a2 | 253 | delta_t = timespec_sub(now, dcon->load_time); |
eecb3e4e AS |
254 | if (delta_t.tv_sec != 0 || |
255 | delta_t.tv_nsec > NSEC_PER_MSEC * 20) { | |
256 | break; | |
257 | } | |
258 | mdelay(4); | |
259 | } | |
260 | } | |
eecb3e4e | 261 | |
45bfe972 AS |
262 | static bool dcon_blank_fb(struct dcon_priv *dcon, bool blank) |
263 | { | |
264 | int err; | |
265 | ||
266 | if (!lock_fb_info(dcon->fbinfo)) { | |
267 | dev_err(&dcon->client->dev, "unable to lock framebuffer\n"); | |
268 | return false; | |
269 | } | |
270 | console_lock(); | |
271 | dcon->ignore_fb_events = true; | |
272 | err = fb_blank(dcon->fbinfo, | |
273 | blank ? FB_BLANK_POWERDOWN : FB_BLANK_UNBLANK); | |
274 | dcon->ignore_fb_events = false; | |
275 | console_unlock(); | |
276 | unlock_fb_info(dcon->fbinfo); | |
277 | ||
278 | if (err) { | |
279 | dev_err(&dcon->client->dev, "couldn't %sblank framebuffer\n", | |
280 | blank ? "" : "un"); | |
281 | return false; | |
282 | } | |
283 | return true; | |
284 | } | |
285 | ||
286 | /* Set the source of the display (CPU or DCON) */ | |
eecb3e4e AS |
287 | static void dcon_source_switch(struct work_struct *work) |
288 | { | |
8d2d3dd1 AS |
289 | struct dcon_priv *dcon = container_of(work, struct dcon_priv, |
290 | switch_source); | |
eecb3e4e | 291 | DECLARE_WAITQUEUE(wait, current); |
bbe963f1 | 292 | int source = dcon->pending_src; |
eecb3e4e | 293 | |
bbe963f1 | 294 | if (dcon->curr_src == source) |
eecb3e4e AS |
295 | return; |
296 | ||
309ef2a2 | 297 | dcon_load_holdoff(dcon); |
eecb3e4e | 298 | |
309ef2a2 | 299 | dcon->switched = false; |
eecb3e4e AS |
300 | |
301 | switch (source) { | |
302 | case DCON_SOURCE_CPU: | |
ac9bbd08 | 303 | pr_info("dcon_source_switch to CPU\n"); |
eecb3e4e | 304 | /* Enable the scanline interrupt bit */ |
8d2d3dd1 | 305 | if (dcon_write(dcon, DCON_REG_MODE, |
bada46e5 | 306 | dcon->disp_mode | MODE_SCAN_INT)) |
ac9bbd08 | 307 | pr_err("couldn't enable scanline interrupt!\n"); |
eecb3e4e AS |
308 | else { |
309 | /* Wait up to one second for the scanline interrupt */ | |
e107e6eb | 310 | wait_event_timeout(dcon_wait_queue, |
309ef2a2 | 311 | dcon->switched == true, HZ); |
eecb3e4e AS |
312 | } |
313 | ||
309ef2a2 | 314 | if (!dcon->switched) |
ac9bbd08 | 315 | pr_err("Timeout entering CPU mode; expect a screen glitch.\n"); |
eecb3e4e AS |
316 | |
317 | /* Turn off the scanline interrupt */ | |
bada46e5 | 318 | if (dcon_write(dcon, DCON_REG_MODE, dcon->disp_mode)) |
ac9bbd08 | 319 | pr_err("couldn't disable scanline interrupt!\n"); |
eecb3e4e AS |
320 | |
321 | /* | |
322 | * Ideally we'd like to disable interrupts here so that the | |
323 | * fb unblanking and DCON turn on happen at a known time value; | |
324 | * however, we can't do that right now with fb_blank | |
325 | * messing with semaphores. | |
326 | * | |
327 | * For now, we just hope.. | |
328 | */ | |
45bfe972 | 329 | if (!dcon_blank_fb(dcon, false)) { |
ac9bbd08 | 330 | pr_err("Failed to enter CPU mode\n"); |
bbe963f1 | 331 | dcon->pending_src = DCON_SOURCE_DCON; |
eecb3e4e AS |
332 | return; |
333 | } | |
eecb3e4e AS |
334 | |
335 | /* And turn off the DCON */ | |
336 | pdata->set_dconload(1); | |
309ef2a2 | 337 | getnstimeofday(&dcon->load_time); |
eecb3e4e | 338 | |
ac9bbd08 | 339 | pr_info("The CPU has control\n"); |
eecb3e4e AS |
340 | break; |
341 | case DCON_SOURCE_DCON: | |
342 | { | |
343 | int t; | |
344 | struct timespec delta_t; | |
345 | ||
ac9bbd08 | 346 | pr_info("dcon_source_switch to DCON\n"); |
eecb3e4e AS |
347 | |
348 | add_wait_queue(&dcon_wait_queue, &wait); | |
349 | set_current_state(TASK_UNINTERRUPTIBLE); | |
350 | ||
351 | /* Clear DCONLOAD - this implies that the DCON is in control */ | |
352 | pdata->set_dconload(0); | |
309ef2a2 | 353 | getnstimeofday(&dcon->load_time); |
eecb3e4e AS |
354 | |
355 | t = schedule_timeout(HZ/2); | |
356 | remove_wait_queue(&dcon_wait_queue, &wait); | |
357 | set_current_state(TASK_RUNNING); | |
358 | ||
309ef2a2 | 359 | if (!dcon->switched) { |
ac9bbd08 | 360 | pr_err("Timeout entering DCON mode; expect a screen glitch.\n"); |
eecb3e4e AS |
361 | } else { |
362 | /* sometimes the DCON doesn't follow its own rules, | |
363 | * and doesn't wait for two vsync pulses before | |
364 | * ack'ing the frame load with an IRQ. the result | |
365 | * is that the display shows the *previously* | |
366 | * loaded frame. we can detect this by looking at | |
367 | * the time between asserting DCONLOAD and the IRQ -- | |
368 | * if it's less than 20msec, then the DCON couldn't | |
369 | * have seen two VSYNC pulses. in that case we | |
e107e6eb | 370 | * deassert and reassert, and hope for the best. |
eecb3e4e AS |
371 | * see http://dev.laptop.org/ticket/9664 |
372 | */ | |
309ef2a2 AS |
373 | delta_t = timespec_sub(dcon->irq_time, dcon->load_time); |
374 | if (dcon->switched && delta_t.tv_sec == 0 && | |
eecb3e4e | 375 | delta_t.tv_nsec < NSEC_PER_MSEC * 20) { |
ac9bbd08 | 376 | pr_err("missed loading, retrying\n"); |
eecb3e4e AS |
377 | pdata->set_dconload(1); |
378 | mdelay(41); | |
379 | pdata->set_dconload(0); | |
309ef2a2 | 380 | getnstimeofday(&dcon->load_time); |
eecb3e4e AS |
381 | mdelay(41); |
382 | } | |
383 | } | |
384 | ||
45bfe972 | 385 | dcon_blank_fb(dcon, true); |
ac9bbd08 | 386 | pr_info("The DCON has control\n"); |
eecb3e4e AS |
387 | break; |
388 | } | |
389 | default: | |
390 | BUG(); | |
391 | } | |
392 | ||
bbe963f1 | 393 | dcon->curr_src = source; |
eecb3e4e AS |
394 | } |
395 | ||
8d2d3dd1 | 396 | static void dcon_set_source(struct dcon_priv *dcon, int arg) |
eecb3e4e | 397 | { |
bbe963f1 | 398 | if (dcon->pending_src == arg) |
eecb3e4e AS |
399 | return; |
400 | ||
bbe963f1 | 401 | dcon->pending_src = arg; |
eecb3e4e | 402 | |
bbe963f1 | 403 | if ((dcon->curr_src != arg) && !work_pending(&dcon->switch_source)) |
8d2d3dd1 | 404 | schedule_work(&dcon->switch_source); |
eecb3e4e AS |
405 | } |
406 | ||
8d2d3dd1 | 407 | static void dcon_set_source_sync(struct dcon_priv *dcon, int arg) |
eecb3e4e | 408 | { |
8d2d3dd1 | 409 | dcon_set_source(dcon, arg); |
eecb3e4e AS |
410 | flush_scheduled_work(); |
411 | } | |
412 | ||
eecb3e4e AS |
413 | static ssize_t dcon_mode_show(struct device *dev, |
414 | struct device_attribute *attr, char *buf) | |
415 | { | |
bada46e5 AS |
416 | struct dcon_priv *dcon = dev_get_drvdata(dev); |
417 | return sprintf(buf, "%4.4X\n", dcon->disp_mode); | |
eecb3e4e AS |
418 | } |
419 | ||
420 | static ssize_t dcon_sleep_show(struct device *dev, | |
421 | struct device_attribute *attr, char *buf) | |
422 | { | |
423 | ||
bada46e5 | 424 | struct dcon_priv *dcon = dev_get_drvdata(dev); |
9ed62423 | 425 | return sprintf(buf, "%d\n", dcon->asleep); |
eecb3e4e AS |
426 | } |
427 | ||
428 | static ssize_t dcon_freeze_show(struct device *dev, | |
429 | struct device_attribute *attr, char *buf) | |
430 | { | |
bbe963f1 AS |
431 | struct dcon_priv *dcon = dev_get_drvdata(dev); |
432 | return sprintf(buf, "%d\n", dcon->curr_src == DCON_SOURCE_DCON ? 1 : 0); | |
eecb3e4e AS |
433 | } |
434 | ||
bb410354 | 435 | static ssize_t dcon_mono_show(struct device *dev, |
eecb3e4e AS |
436 | struct device_attribute *attr, char *buf) |
437 | { | |
bb410354 | 438 | struct dcon_priv *dcon = dev_get_drvdata(dev); |
9ed62423 | 439 | return sprintf(buf, "%d\n", dcon->mono); |
eecb3e4e AS |
440 | } |
441 | ||
442 | static ssize_t dcon_resumeline_show(struct device *dev, | |
443 | struct device_attribute *attr, char *buf) | |
444 | { | |
445 | return sprintf(buf, "%d\n", resumeline); | |
446 | } | |
447 | ||
bb410354 | 448 | static ssize_t dcon_mono_store(struct device *dev, |
eecb3e4e AS |
449 | struct device_attribute *attr, const char *buf, size_t count) |
450 | { | |
31a3da41 MB |
451 | unsigned long enable_mono; |
452 | int rc; | |
eecb3e4e | 453 | |
88e09a5e | 454 | rc = kstrtoul(buf, 10, &enable_mono); |
31a3da41 MB |
455 | if (rc) |
456 | return rc; | |
eecb3e4e | 457 | |
9ed62423 | 458 | dcon_set_mono_mode(dev_get_drvdata(dev), enable_mono ? true : false); |
eecb3e4e | 459 | |
31a3da41 | 460 | return count; |
eecb3e4e AS |
461 | } |
462 | ||
463 | static ssize_t dcon_freeze_store(struct device *dev, | |
464 | struct device_attribute *attr, const char *buf, size_t count) | |
465 | { | |
8d2d3dd1 | 466 | struct dcon_priv *dcon = dev_get_drvdata(dev); |
31a3da41 MB |
467 | unsigned long output; |
468 | int ret; | |
eecb3e4e | 469 | |
88e09a5e | 470 | ret = kstrtoul(buf, 10, &output); |
31a3da41 MB |
471 | if (ret) |
472 | return ret; | |
eecb3e4e | 473 | |
ac9bbd08 | 474 | pr_info("dcon_freeze_store: %lu\n", output); |
eecb3e4e AS |
475 | |
476 | switch (output) { | |
477 | case 0: | |
8d2d3dd1 | 478 | dcon_set_source(dcon, DCON_SOURCE_CPU); |
eecb3e4e AS |
479 | break; |
480 | case 1: | |
8d2d3dd1 | 481 | dcon_set_source_sync(dcon, DCON_SOURCE_DCON); |
eecb3e4e | 482 | break; |
e107e6eb | 483 | case 2: /* normally unused */ |
8d2d3dd1 | 484 | dcon_set_source(dcon, DCON_SOURCE_DCON); |
eecb3e4e AS |
485 | break; |
486 | default: | |
487 | return -EINVAL; | |
488 | } | |
489 | ||
490 | return count; | |
491 | } | |
492 | ||
493 | static ssize_t dcon_resumeline_store(struct device *dev, | |
494 | struct device_attribute *attr, const char *buf, size_t count) | |
495 | { | |
c542341d | 496 | unsigned short rl; |
31a3da41 | 497 | int rc; |
eecb3e4e | 498 | |
c542341d | 499 | rc = kstrtou16(buf, 10, &rl); |
31a3da41 | 500 | if (rc) |
eecb3e4e AS |
501 | return rc; |
502 | ||
503 | resumeline = rl; | |
8d2d3dd1 | 504 | dcon_write(dev_get_drvdata(dev), DCON_REG_SCAN_INT, resumeline); |
eecb3e4e | 505 | |
31a3da41 | 506 | return count; |
eecb3e4e AS |
507 | } |
508 | ||
509 | static ssize_t dcon_sleep_store(struct device *dev, | |
510 | struct device_attribute *attr, const char *buf, size_t count) | |
511 | { | |
31a3da41 MB |
512 | unsigned long output; |
513 | int ret; | |
eecb3e4e | 514 | |
88e09a5e | 515 | ret = kstrtoul(buf, 10, &output); |
31a3da41 MB |
516 | if (ret) |
517 | return ret; | |
eecb3e4e | 518 | |
bada46e5 | 519 | dcon_sleep(dev_get_drvdata(dev), output ? true : false); |
eecb3e4e AS |
520 | return count; |
521 | } | |
522 | ||
523 | static struct device_attribute dcon_device_files[] = { | |
524 | __ATTR(mode, 0444, dcon_mode_show, NULL), | |
525 | __ATTR(sleep, 0644, dcon_sleep_show, dcon_sleep_store), | |
526 | __ATTR(freeze, 0644, dcon_freeze_show, dcon_freeze_store), | |
bb410354 | 527 | __ATTR(monochrome, 0644, dcon_mono_show, dcon_mono_store), |
eecb3e4e AS |
528 | __ATTR(resumeline, 0644, dcon_resumeline_show, dcon_resumeline_store), |
529 | }; | |
530 | ||
c59eef17 AS |
531 | static int dcon_bl_update(struct backlight_device *dev) |
532 | { | |
533 | struct dcon_priv *dcon = bl_get_data(dev); | |
534 | u8 level = dev->props.brightness & 0x0F; | |
535 | ||
536 | if (dev->props.power != FB_BLANK_UNBLANK) | |
537 | level = 0; | |
538 | ||
539 | if (level != dcon->bl_val) | |
540 | dcon_set_backlight(dcon, level); | |
541 | ||
542 | return 0; | |
543 | } | |
544 | ||
545 | static int dcon_bl_get(struct backlight_device *dev) | |
546 | { | |
547 | struct dcon_priv *dcon = bl_get_data(dev); | |
548 | return dcon->bl_val; | |
549 | } | |
550 | ||
acc2472e | 551 | static const struct backlight_ops dcon_bl_ops = { |
c59eef17 AS |
552 | .update_status = dcon_bl_update, |
553 | .get_brightness = dcon_bl_get, | |
eecb3e4e AS |
554 | }; |
555 | ||
c59eef17 AS |
556 | static struct backlight_properties dcon_bl_props = { |
557 | .max_brightness = 15, | |
bb7ca747 | 558 | .type = BACKLIGHT_RAW, |
c59eef17 AS |
559 | .power = FB_BLANK_UNBLANK, |
560 | }; | |
eecb3e4e | 561 | |
e107e6eb MB |
562 | static int dcon_reboot_notify(struct notifier_block *nb, |
563 | unsigned long foo, void *bar) | |
eecb3e4e | 564 | { |
8d2d3dd1 AS |
565 | struct dcon_priv *dcon = container_of(nb, struct dcon_priv, reboot_nb); |
566 | ||
567 | if (!dcon || !dcon->client) | |
eecb3e4e AS |
568 | return 0; |
569 | ||
570 | /* Turn off the DCON. Entirely. */ | |
8d2d3dd1 AS |
571 | dcon_write(dcon, DCON_REG_MODE, 0x39); |
572 | dcon_write(dcon, DCON_REG_MODE, 0x32); | |
eecb3e4e AS |
573 | return 0; |
574 | } | |
575 | ||
e107e6eb MB |
576 | static int unfreeze_on_panic(struct notifier_block *nb, |
577 | unsigned long e, void *p) | |
eecb3e4e AS |
578 | { |
579 | pdata->set_dconload(1); | |
580 | return NOTIFY_DONE; | |
581 | } | |
582 | ||
583 | static struct notifier_block dcon_panic_nb = { | |
584 | .notifier_call = unfreeze_on_panic, | |
585 | }; | |
586 | ||
95699fb7 AS |
587 | /* |
588 | * When the framebuffer sleeps due to external sources (e.g. user idle), power | |
589 | * down the DCON as well. Power it back up when the fb comes back to life. | |
590 | */ | |
feaa98b2 | 591 | static int dcon_fb_notifier(struct notifier_block *self, |
e107e6eb | 592 | unsigned long event, void *data) |
eecb3e4e AS |
593 | { |
594 | struct fb_event *evdata = data; | |
feaa98b2 AS |
595 | struct dcon_priv *dcon = container_of(self, struct dcon_priv, |
596 | fbevent_nb); | |
c2562687 | 597 | int *blank = (int *)evdata->data; |
95699fb7 | 598 | if (((event != FB_EVENT_BLANK) && (event != FB_EVENT_CONBLANK)) || |
45bfe972 | 599 | dcon->ignore_fb_events) |
eecb3e4e | 600 | return 0; |
bada46e5 | 601 | dcon_sleep(dcon, *blank ? true : false); |
eecb3e4e AS |
602 | return 0; |
603 | } | |
604 | ||
eecb3e4e AS |
605 | static int dcon_detect(struct i2c_client *client, struct i2c_board_info *info) |
606 | { | |
607 | strlcpy(info->type, "olpc_dcon", I2C_NAME_SIZE); | |
608 | ||
609 | return 0; | |
610 | } | |
611 | ||
612 | static int dcon_probe(struct i2c_client *client, const struct i2c_device_id *id) | |
613 | { | |
8d2d3dd1 | 614 | struct dcon_priv *dcon; |
a90dcd4f | 615 | int rc, i, j; |
eecb3e4e | 616 | |
097cd83a AS |
617 | if (!pdata) |
618 | return -ENXIO; | |
619 | ||
8d2d3dd1 AS |
620 | dcon = kzalloc(sizeof(*dcon), GFP_KERNEL); |
621 | if (!dcon) | |
622 | return -ENOMEM; | |
623 | ||
624 | dcon->client = client; | |
625 | INIT_WORK(&dcon->switch_source, dcon_source_switch); | |
626 | dcon->reboot_nb.notifier_call = dcon_reboot_notify; | |
627 | dcon->reboot_nb.priority = -1; | |
feaa98b2 | 628 | dcon->fbevent_nb.notifier_call = dcon_fb_notifier; |
8d2d3dd1 AS |
629 | |
630 | i2c_set_clientdata(client, dcon); | |
631 | ||
45bfe972 AS |
632 | if (num_registered_fb < 1) { |
633 | dev_err(&client->dev, "DCON driver requires a registered fb\n"); | |
634 | rc = -EIO; | |
635 | goto einit; | |
636 | } | |
637 | dcon->fbinfo = registered_fb[0]; | |
eecb3e4e | 638 | |
8d2d3dd1 | 639 | rc = dcon_hw_init(dcon, 1); |
eecb3e4e AS |
640 | if (rc) |
641 | goto einit; | |
642 | ||
643 | /* Add the DCON device */ | |
644 | ||
645 | dcon_device = platform_device_alloc("dcon", -1); | |
646 | ||
647 | if (dcon_device == NULL) { | |
ac9bbd08 | 648 | pr_err("Unable to create the DCON device\n"); |
eecb3e4e AS |
649 | rc = -ENOMEM; |
650 | goto eirq; | |
651 | } | |
e107e6eb | 652 | rc = platform_device_add(dcon_device); |
8d2d3dd1 | 653 | platform_set_drvdata(dcon_device, dcon); |
eecb3e4e | 654 | |
e107e6eb | 655 | if (rc) { |
ac9bbd08 | 656 | pr_err("Unable to add the DCON device\n"); |
eecb3e4e AS |
657 | goto edev; |
658 | } | |
659 | ||
e107e6eb | 660 | for (i = 0; i < ARRAY_SIZE(dcon_device_files); i++) { |
a90dcd4f MB |
661 | rc = device_create_file(&dcon_device->dev, |
662 | &dcon_device_files[i]); | |
663 | if (rc) { | |
664 | dev_err(&dcon_device->dev, "Cannot create sysfs file\n"); | |
665 | goto ecreate; | |
666 | } | |
667 | } | |
eecb3e4e | 668 | |
c59eef17 | 669 | dcon->bl_val = dcon_read(dcon, DCON_REG_BRIGHT) & 0x0F; |
eecb3e4e | 670 | |
c59eef17 AS |
671 | /* Add the backlight device for the DCON */ |
672 | dcon_bl_props.brightness = dcon->bl_val; | |
673 | dcon->bl_dev = backlight_device_register("dcon-bl", &dcon_device->dev, | |
674 | dcon, &dcon_bl_ops, &dcon_bl_props); | |
675 | if (IS_ERR(dcon->bl_dev)) { | |
676 | dev_err(&client->dev, "cannot register backlight dev (%ld)\n", | |
677 | PTR_ERR(dcon->bl_dev)); | |
678 | dcon->bl_dev = NULL; | |
eecb3e4e AS |
679 | } |
680 | ||
8d2d3dd1 | 681 | register_reboot_notifier(&dcon->reboot_nb); |
eecb3e4e | 682 | atomic_notifier_chain_register(&panic_notifier_list, &dcon_panic_nb); |
feaa98b2 | 683 | fb_register_client(&dcon->fbevent_nb); |
eecb3e4e AS |
684 | |
685 | return 0; | |
686 | ||
a90dcd4f MB |
687 | ecreate: |
688 | for (j = 0; j < i; j++) | |
689 | device_remove_file(&dcon_device->dev, &dcon_device_files[j]); | |
eecb3e4e AS |
690 | edev: |
691 | platform_device_unregister(dcon_device); | |
692 | dcon_device = NULL; | |
eecb3e4e | 693 | eirq: |
bbe963f1 | 694 | free_irq(DCON_IRQ, dcon); |
eecb3e4e | 695 | einit: |
8d2d3dd1 | 696 | kfree(dcon); |
eecb3e4e AS |
697 | return rc; |
698 | } | |
699 | ||
700 | static int dcon_remove(struct i2c_client *client) | |
701 | { | |
8d2d3dd1 AS |
702 | struct dcon_priv *dcon = i2c_get_clientdata(client); |
703 | ||
feaa98b2 | 704 | fb_unregister_client(&dcon->fbevent_nb); |
8d2d3dd1 | 705 | unregister_reboot_notifier(&dcon->reboot_nb); |
eecb3e4e AS |
706 | atomic_notifier_chain_unregister(&panic_notifier_list, &dcon_panic_nb); |
707 | ||
bbe963f1 | 708 | free_irq(DCON_IRQ, dcon); |
eecb3e4e | 709 | |
c59eef17 AS |
710 | if (dcon->bl_dev) |
711 | backlight_device_unregister(dcon->bl_dev); | |
eecb3e4e AS |
712 | |
713 | if (dcon_device != NULL) | |
714 | platform_device_unregister(dcon_device); | |
8d2d3dd1 AS |
715 | cancel_work_sync(&dcon->switch_source); |
716 | ||
717 | kfree(dcon); | |
eecb3e4e | 718 | |
eecb3e4e AS |
719 | return 0; |
720 | } | |
721 | ||
722 | #ifdef CONFIG_PM | |
723 | static int dcon_suspend(struct i2c_client *client, pm_message_t state) | |
724 | { | |
8d2d3dd1 AS |
725 | struct dcon_priv *dcon = i2c_get_clientdata(client); |
726 | ||
bada46e5 | 727 | if (!dcon->asleep) { |
eecb3e4e | 728 | /* Set up the DCON to have the source */ |
8d2d3dd1 | 729 | dcon_set_source_sync(dcon, DCON_SOURCE_DCON); |
eecb3e4e AS |
730 | } |
731 | ||
732 | return 0; | |
733 | } | |
734 | ||
735 | static int dcon_resume(struct i2c_client *client) | |
736 | { | |
8d2d3dd1 AS |
737 | struct dcon_priv *dcon = i2c_get_clientdata(client); |
738 | ||
bada46e5 | 739 | if (!dcon->asleep) { |
8d2d3dd1 AS |
740 | dcon_bus_stabilize(dcon, 0); |
741 | dcon_set_source(dcon, DCON_SOURCE_CPU); | |
eecb3e4e AS |
742 | } |
743 | ||
744 | return 0; | |
745 | } | |
746 | ||
747 | #endif | |
748 | ||
749 | ||
097cd83a | 750 | irqreturn_t dcon_interrupt(int irq, void *id) |
eecb3e4e | 751 | { |
bbe963f1 | 752 | struct dcon_priv *dcon = id; |
91762057 | 753 | u8 status; |
eecb3e4e | 754 | |
91762057 | 755 | if (pdata->read_status(&status)) |
eecb3e4e AS |
756 | return IRQ_NONE; |
757 | ||
758 | switch (status & 3) { | |
759 | case 3: | |
ac9bbd08 | 760 | pr_debug("DCONLOAD_MISSED interrupt\n"); |
eecb3e4e AS |
761 | break; |
762 | ||
763 | case 2: /* switch to DCON mode */ | |
764 | case 1: /* switch to CPU mode */ | |
309ef2a2 AS |
765 | dcon->switched = true; |
766 | getnstimeofday(&dcon->irq_time); | |
eecb3e4e AS |
767 | wake_up(&dcon_wait_queue); |
768 | break; | |
769 | ||
770 | case 0: | |
771 | /* workaround resume case: the DCON (on 1.5) doesn't | |
772 | * ever assert status 0x01 when switching to CPU mode | |
773 | * during resume. this is because DCONLOAD is de-asserted | |
774 | * _immediately_ upon exiting S3, so the actual release | |
775 | * of the DCON happened long before this point. | |
776 | * see http://dev.laptop.org/ticket/9869 | |
777 | */ | |
309ef2a2 AS |
778 | if (dcon->curr_src != dcon->pending_src && !dcon->switched) { |
779 | dcon->switched = true; | |
780 | getnstimeofday(&dcon->irq_time); | |
eecb3e4e | 781 | wake_up(&dcon_wait_queue); |
ac9bbd08 | 782 | pr_debug("switching w/ status 0/0\n"); |
eecb3e4e | 783 | } else { |
ac9bbd08 | 784 | pr_debug("scanline interrupt w/CPU\n"); |
eecb3e4e AS |
785 | } |
786 | } | |
787 | ||
788 | return IRQ_HANDLED; | |
789 | } | |
790 | ||
56463de0 | 791 | static const struct i2c_device_id dcon_idtable[] = { |
eecb3e4e AS |
792 | { "olpc_dcon", 0 }, |
793 | { } | |
794 | }; | |
795 | ||
796 | MODULE_DEVICE_TABLE(i2c, dcon_idtable); | |
797 | ||
097cd83a | 798 | struct i2c_driver dcon_driver = { |
eecb3e4e AS |
799 | .driver = { |
800 | .name = "olpc_dcon", | |
801 | }, | |
802 | .class = I2C_CLASS_DDC | I2C_CLASS_HWMON, | |
803 | .id_table = dcon_idtable, | |
804 | .probe = dcon_probe, | |
805 | .remove = __devexit_p(dcon_remove), | |
806 | .detect = dcon_detect, | |
807 | .address_list = normal_i2c, | |
808 | #ifdef CONFIG_PM | |
809 | .suspend = dcon_suspend, | |
810 | .resume = dcon_resume, | |
811 | #endif | |
812 | }; | |
813 | ||
eecb3e4e AS |
814 | static int __init olpc_dcon_init(void) |
815 | { | |
097cd83a AS |
816 | #ifdef CONFIG_FB_OLPC_DCON_1_5 |
817 | /* XO-1.5 */ | |
818 | if (olpc_board_at_least(olpc_board(0xd0))) | |
819 | pdata = &dcon_pdata_xo_1_5; | |
820 | #endif | |
821 | #ifdef CONFIG_FB_OLPC_DCON_1 | |
822 | if (!pdata) | |
823 | pdata = &dcon_pdata_xo_1; | |
824 | #endif | |
eecb3e4e | 825 | |
56463de0 | 826 | return i2c_add_driver(&dcon_driver); |
eecb3e4e AS |
827 | } |
828 | ||
829 | static void __exit olpc_dcon_exit(void) | |
830 | { | |
831 | i2c_del_driver(&dcon_driver); | |
832 | } | |
833 | ||
834 | module_init(olpc_dcon_init); | |
835 | module_exit(olpc_dcon_exit); | |
836 | ||
837 | MODULE_LICENSE("GPL"); |