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 | ||
14 | ||
15 | #include <linux/kernel.h> | |
16 | #include <linux/fb.h> | |
17 | #include <linux/console.h> | |
18 | #include <linux/i2c.h> | |
19 | #include <linux/platform_device.h> | |
eecb3e4e | 20 | #include <linux/pci.h> |
eecb3e4e AS |
21 | #include <linux/pci_ids.h> |
22 | #include <linux/interrupt.h> | |
23 | #include <linux/delay.h> | |
99c97852 | 24 | #include <linux/module.h> |
eecb3e4e AS |
25 | #include <linux/backlight.h> |
26 | #include <linux/device.h> | |
e107e6eb | 27 | #include <linux/uaccess.h> |
eecb3e4e AS |
28 | #include <linux/ctype.h> |
29 | #include <linux/reboot.h> | |
eecb3e4e AS |
30 | #include <asm/tsc.h> |
31 | #include <asm/olpc.h> | |
32 | ||
33 | #include "olpc_dcon.h" | |
34 | ||
35 | /* Module definitions */ | |
36 | ||
37 | static int resumeline = 898; | |
38 | module_param(resumeline, int, 0444); | |
39 | ||
eecb3e4e AS |
40 | /* Default off since it doesn't work on DCON ASIC in B-test OLPC board */ |
41 | static int useaa = 1; | |
42 | module_param(useaa, int, 0444); | |
43 | ||
eecb3e4e AS |
44 | static struct dcon_platform_data *pdata; |
45 | ||
46 | /* I2C structures */ | |
47 | ||
eecb3e4e AS |
48 | /* Platform devices */ |
49 | static struct platform_device *dcon_device; | |
50 | ||
eecb3e4e AS |
51 | static DECLARE_WAIT_QUEUE_HEAD(dcon_wait_queue); |
52 | ||
53 | static unsigned short normal_i2c[] = { 0x0d, I2C_CLIENT_END }; | |
54 | ||
8d2d3dd1 AS |
55 | static s32 dcon_write(struct dcon_priv *dcon, u8 reg, u16 val) |
56 | { | |
57 | return i2c_smbus_write_word_data(dcon->client, reg, val); | |
58 | } | |
59 | ||
60 | static s32 dcon_read(struct dcon_priv *dcon, u8 reg) | |
61 | { | |
62 | return i2c_smbus_read_word_data(dcon->client, reg); | |
63 | } | |
eecb3e4e | 64 | |
eecb3e4e AS |
65 | /* ===== API functions - these are called by a variety of users ==== */ |
66 | ||
8d2d3dd1 | 67 | static int dcon_hw_init(struct dcon_priv *dcon, int is_init) |
eecb3e4e AS |
68 | { |
69 | uint16_t ver; | |
70 | int rc = 0; | |
71 | ||
0b7a41eb | 72 | ver = dcon_read(dcon, DCON_REG_ID); |
eecb3e4e AS |
73 | if ((ver >> 8) != 0xDC) { |
74 | printk(KERN_ERR "olpc-dcon: DCON ID not 0xDCxx: 0x%04x " | |
75 | "instead.\n", ver); | |
76 | rc = -ENXIO; | |
77 | goto err; | |
78 | } | |
79 | ||
80 | if (is_init) { | |
81 | printk(KERN_INFO "olpc-dcon: Discovered DCON version %x\n", | |
82 | ver & 0xFF); | |
bbe963f1 | 83 | rc = pdata->init(dcon); |
e107e6eb | 84 | if (rc != 0) { |
eecb3e4e AS |
85 | printk(KERN_ERR "olpc-dcon: Unable to init.\n"); |
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; | |
e107e6eb MB |
137 | x = olpc_ec_cmd(0x26, (unsigned char *) &x, 1, NULL, 0); |
138 | if (x) { | |
eecb3e4e AS |
139 | printk(KERN_WARNING "olpc-dcon: unable to force dcon " |
140 | "to power up: %d!\n", x); | |
141 | return x; | |
142 | } | |
143 | msleep(10); /* we'll be conservative */ | |
144 | } | |
e107e6eb | 145 | |
eecb3e4e AS |
146 | pdata->bus_stabilize_wiggle(); |
147 | ||
148 | for (x = -1, timeout = 50; timeout && x < 0; timeout--) { | |
149 | msleep(1); | |
8d2d3dd1 | 150 | x = dcon_read(dcon, DCON_REG_ID); |
eecb3e4e AS |
151 | } |
152 | if (x < 0) { | |
153 | printk(KERN_ERR "olpc-dcon: unable to stabilize dcon's " | |
154 | "smbus, reasserting power and praying.\n"); | |
316604be | 155 | BUG_ON(olpc_board_at_least(olpc_board(0xc2))); |
eecb3e4e AS |
156 | x = 0; |
157 | olpc_ec_cmd(0x26, (unsigned char *) &x, 1, NULL, 0); | |
158 | msleep(100); | |
159 | is_powered_down = 1; | |
160 | goto power_up; /* argh, stupid hardware.. */ | |
161 | } | |
162 | ||
163 | if (is_powered_down) | |
8d2d3dd1 | 164 | return dcon_hw_init(dcon, 0); |
eecb3e4e AS |
165 | return 0; |
166 | } | |
167 | ||
c59eef17 | 168 | static void dcon_set_backlight(struct dcon_priv *dcon, u8 level) |
eecb3e4e | 169 | { |
c59eef17 AS |
170 | dcon->bl_val = level; |
171 | dcon_write(dcon, DCON_REG_BRIGHT, dcon->bl_val); | |
eecb3e4e AS |
172 | |
173 | /* Purposely turn off the backlight when we go to level 0 */ | |
c59eef17 | 174 | if (dcon->bl_val == 0) { |
bada46e5 AS |
175 | dcon->disp_mode &= ~MODE_BL_ENABLE; |
176 | dcon_write(dcon, DCON_REG_MODE, dcon->disp_mode); | |
177 | } else if (!(dcon->disp_mode & MODE_BL_ENABLE)) { | |
178 | dcon->disp_mode |= MODE_BL_ENABLE; | |
179 | dcon_write(dcon, DCON_REG_MODE, dcon->disp_mode); | |
eecb3e4e AS |
180 | } |
181 | } | |
182 | ||
eecb3e4e | 183 | /* Set the output type to either color or mono */ |
bb410354 | 184 | static int dcon_set_mono_mode(struct dcon_priv *dcon, bool enable_mono) |
eecb3e4e | 185 | { |
bb410354 | 186 | if (dcon->mono == enable_mono) |
eecb3e4e AS |
187 | return 0; |
188 | ||
bb410354 | 189 | dcon->mono = enable_mono; |
eecb3e4e | 190 | |
bb410354 | 191 | if (enable_mono) { |
bada46e5 AS |
192 | dcon->disp_mode &= ~(MODE_CSWIZZLE | MODE_COL_AA); |
193 | dcon->disp_mode |= MODE_MONO_LUMA; | |
e107e6eb | 194 | } else { |
bada46e5 AS |
195 | dcon->disp_mode &= ~(MODE_MONO_LUMA); |
196 | dcon->disp_mode |= MODE_CSWIZZLE; | |
eecb3e4e | 197 | if (useaa) |
bada46e5 | 198 | dcon->disp_mode |= MODE_COL_AA; |
eecb3e4e AS |
199 | } |
200 | ||
bada46e5 | 201 | dcon_write(dcon, DCON_REG_MODE, dcon->disp_mode); |
eecb3e4e AS |
202 | return 0; |
203 | } | |
204 | ||
205 | /* For now, this will be really stupid - we need to address how | |
206 | * DCONLOAD works in a sleep and account for it accordingly | |
207 | */ | |
208 | ||
bada46e5 | 209 | static void dcon_sleep(struct dcon_priv *dcon, bool sleep) |
eecb3e4e AS |
210 | { |
211 | int x; | |
212 | ||
213 | /* Turn off the backlight and put the DCON to sleep */ | |
214 | ||
bada46e5 | 215 | if (dcon->asleep == sleep) |
eecb3e4e AS |
216 | return; |
217 | ||
316604be | 218 | if (!olpc_board_at_least(olpc_board(0xc2))) |
eecb3e4e AS |
219 | return; |
220 | ||
bada46e5 | 221 | if (sleep) { |
eecb3e4e | 222 | x = 0; |
e107e6eb MB |
223 | x = olpc_ec_cmd(0x26, (unsigned char *) &x, 1, NULL, 0); |
224 | if (x) | |
eecb3e4e AS |
225 | printk(KERN_WARNING "olpc-dcon: unable to force dcon " |
226 | "to power down: %d!\n", x); | |
227 | else | |
bada46e5 | 228 | dcon->asleep = sleep; |
e107e6eb | 229 | } else { |
eecb3e4e | 230 | /* Only re-enable the backlight if the backlight value is set */ |
c59eef17 | 231 | if (dcon->bl_val != 0) |
bada46e5 | 232 | dcon->disp_mode |= MODE_BL_ENABLE; |
8d2d3dd1 | 233 | x = dcon_bus_stabilize(dcon, 1); |
e107e6eb | 234 | if (x) |
eecb3e4e AS |
235 | printk(KERN_WARNING "olpc-dcon: unable to reinit dcon" |
236 | " hardware: %d!\n", x); | |
237 | else | |
bada46e5 | 238 | dcon->asleep = sleep; |
eecb3e4e AS |
239 | |
240 | /* Restore backlight */ | |
c59eef17 | 241 | dcon_set_backlight(dcon, dcon->bl_val); |
eecb3e4e AS |
242 | } |
243 | ||
244 | /* We should turn off some stuff in the framebuffer - but what? */ | |
245 | } | |
246 | ||
247 | /* the DCON seems to get confused if we change DCONLOAD too | |
e107e6eb | 248 | * frequently -- i.e., approximately faster than frame time. |
eecb3e4e AS |
249 | * normally we don't change it this fast, so in general we won't |
250 | * delay here. | |
251 | */ | |
309ef2a2 | 252 | static void dcon_load_holdoff(struct dcon_priv *dcon) |
eecb3e4e AS |
253 | { |
254 | struct timespec delta_t, now; | |
e107e6eb | 255 | while (1) { |
eecb3e4e | 256 | getnstimeofday(&now); |
309ef2a2 | 257 | delta_t = timespec_sub(now, dcon->load_time); |
eecb3e4e AS |
258 | if (delta_t.tv_sec != 0 || |
259 | delta_t.tv_nsec > NSEC_PER_MSEC * 20) { | |
260 | break; | |
261 | } | |
262 | mdelay(4); | |
263 | } | |
264 | } | |
eecb3e4e | 265 | |
45bfe972 AS |
266 | static bool dcon_blank_fb(struct dcon_priv *dcon, bool blank) |
267 | { | |
268 | int err; | |
269 | ||
270 | if (!lock_fb_info(dcon->fbinfo)) { | |
271 | dev_err(&dcon->client->dev, "unable to lock framebuffer\n"); | |
272 | return false; | |
273 | } | |
274 | console_lock(); | |
275 | dcon->ignore_fb_events = true; | |
276 | err = fb_blank(dcon->fbinfo, | |
277 | blank ? FB_BLANK_POWERDOWN : FB_BLANK_UNBLANK); | |
278 | dcon->ignore_fb_events = false; | |
279 | console_unlock(); | |
280 | unlock_fb_info(dcon->fbinfo); | |
281 | ||
282 | if (err) { | |
283 | dev_err(&dcon->client->dev, "couldn't %sblank framebuffer\n", | |
284 | blank ? "" : "un"); | |
285 | return false; | |
286 | } | |
287 | return true; | |
288 | } | |
289 | ||
290 | /* Set the source of the display (CPU or DCON) */ | |
eecb3e4e AS |
291 | static void dcon_source_switch(struct work_struct *work) |
292 | { | |
8d2d3dd1 AS |
293 | struct dcon_priv *dcon = container_of(work, struct dcon_priv, |
294 | switch_source); | |
eecb3e4e | 295 | DECLARE_WAITQUEUE(wait, current); |
bbe963f1 | 296 | int source = dcon->pending_src; |
eecb3e4e | 297 | |
bbe963f1 | 298 | if (dcon->curr_src == source) |
eecb3e4e AS |
299 | return; |
300 | ||
309ef2a2 | 301 | dcon_load_holdoff(dcon); |
eecb3e4e | 302 | |
309ef2a2 | 303 | dcon->switched = false; |
eecb3e4e AS |
304 | |
305 | switch (source) { | |
306 | case DCON_SOURCE_CPU: | |
307 | printk("dcon_source_switch to CPU\n"); | |
308 | /* Enable the scanline interrupt bit */ | |
8d2d3dd1 | 309 | if (dcon_write(dcon, DCON_REG_MODE, |
bada46e5 | 310 | dcon->disp_mode | MODE_SCAN_INT)) |
e107e6eb MB |
311 | printk(KERN_ERR |
312 | "olpc-dcon: couldn't enable scanline interrupt!\n"); | |
eecb3e4e AS |
313 | else { |
314 | /* Wait up to one second for the scanline interrupt */ | |
e107e6eb | 315 | wait_event_timeout(dcon_wait_queue, |
309ef2a2 | 316 | dcon->switched == true, HZ); |
eecb3e4e AS |
317 | } |
318 | ||
309ef2a2 | 319 | if (!dcon->switched) |
eecb3e4e AS |
320 | printk(KERN_ERR "olpc-dcon: Timeout entering CPU mode; expect a screen glitch.\n"); |
321 | ||
322 | /* Turn off the scanline interrupt */ | |
bada46e5 | 323 | if (dcon_write(dcon, DCON_REG_MODE, dcon->disp_mode)) |
eecb3e4e AS |
324 | printk(KERN_ERR "olpc-dcon: couldn't disable scanline interrupt!\n"); |
325 | ||
326 | /* | |
327 | * Ideally we'd like to disable interrupts here so that the | |
328 | * fb unblanking and DCON turn on happen at a known time value; | |
329 | * however, we can't do that right now with fb_blank | |
330 | * messing with semaphores. | |
331 | * | |
332 | * For now, we just hope.. | |
333 | */ | |
45bfe972 | 334 | if (!dcon_blank_fb(dcon, false)) { |
eecb3e4e | 335 | printk(KERN_ERR "olpc-dcon: Failed to enter CPU mode\n"); |
bbe963f1 | 336 | dcon->pending_src = DCON_SOURCE_DCON; |
eecb3e4e AS |
337 | return; |
338 | } | |
eecb3e4e AS |
339 | |
340 | /* And turn off the DCON */ | |
341 | pdata->set_dconload(1); | |
309ef2a2 | 342 | getnstimeofday(&dcon->load_time); |
eecb3e4e AS |
343 | |
344 | printk(KERN_INFO "olpc-dcon: The CPU has control\n"); | |
345 | break; | |
346 | case DCON_SOURCE_DCON: | |
347 | { | |
348 | int t; | |
349 | struct timespec delta_t; | |
350 | ||
e107e6eb | 351 | printk(KERN_INFO "dcon_source_switch to DCON\n"); |
eecb3e4e AS |
352 | |
353 | add_wait_queue(&dcon_wait_queue, &wait); | |
354 | set_current_state(TASK_UNINTERRUPTIBLE); | |
355 | ||
356 | /* Clear DCONLOAD - this implies that the DCON is in control */ | |
357 | pdata->set_dconload(0); | |
309ef2a2 | 358 | getnstimeofday(&dcon->load_time); |
eecb3e4e AS |
359 | |
360 | t = schedule_timeout(HZ/2); | |
361 | remove_wait_queue(&dcon_wait_queue, &wait); | |
362 | set_current_state(TASK_RUNNING); | |
363 | ||
309ef2a2 | 364 | if (!dcon->switched) { |
eecb3e4e AS |
365 | printk(KERN_ERR "olpc-dcon: Timeout entering DCON mode; expect a screen glitch.\n"); |
366 | } else { | |
367 | /* sometimes the DCON doesn't follow its own rules, | |
368 | * and doesn't wait for two vsync pulses before | |
369 | * ack'ing the frame load with an IRQ. the result | |
370 | * is that the display shows the *previously* | |
371 | * loaded frame. we can detect this by looking at | |
372 | * the time between asserting DCONLOAD and the IRQ -- | |
373 | * if it's less than 20msec, then the DCON couldn't | |
374 | * have seen two VSYNC pulses. in that case we | |
e107e6eb | 375 | * deassert and reassert, and hope for the best. |
eecb3e4e AS |
376 | * see http://dev.laptop.org/ticket/9664 |
377 | */ | |
309ef2a2 AS |
378 | delta_t = timespec_sub(dcon->irq_time, dcon->load_time); |
379 | if (dcon->switched && delta_t.tv_sec == 0 && | |
eecb3e4e AS |
380 | delta_t.tv_nsec < NSEC_PER_MSEC * 20) { |
381 | printk(KERN_ERR "olpc-dcon: missed loading, retrying\n"); | |
382 | pdata->set_dconload(1); | |
383 | mdelay(41); | |
384 | pdata->set_dconload(0); | |
309ef2a2 | 385 | getnstimeofday(&dcon->load_time); |
eecb3e4e AS |
386 | mdelay(41); |
387 | } | |
388 | } | |
389 | ||
45bfe972 | 390 | dcon_blank_fb(dcon, true); |
eecb3e4e AS |
391 | printk(KERN_INFO "olpc-dcon: The DCON has control\n"); |
392 | break; | |
393 | } | |
394 | default: | |
395 | BUG(); | |
396 | } | |
397 | ||
bbe963f1 | 398 | dcon->curr_src = source; |
eecb3e4e AS |
399 | } |
400 | ||
8d2d3dd1 | 401 | static void dcon_set_source(struct dcon_priv *dcon, int arg) |
eecb3e4e | 402 | { |
bbe963f1 | 403 | if (dcon->pending_src == arg) |
eecb3e4e AS |
404 | return; |
405 | ||
bbe963f1 | 406 | dcon->pending_src = arg; |
eecb3e4e | 407 | |
bbe963f1 | 408 | if ((dcon->curr_src != arg) && !work_pending(&dcon->switch_source)) |
8d2d3dd1 | 409 | schedule_work(&dcon->switch_source); |
eecb3e4e AS |
410 | } |
411 | ||
8d2d3dd1 | 412 | static void dcon_set_source_sync(struct dcon_priv *dcon, int arg) |
eecb3e4e | 413 | { |
8d2d3dd1 | 414 | dcon_set_source(dcon, arg); |
eecb3e4e AS |
415 | flush_scheduled_work(); |
416 | } | |
417 | ||
eecb3e4e AS |
418 | static ssize_t dcon_mode_show(struct device *dev, |
419 | struct device_attribute *attr, char *buf) | |
420 | { | |
bada46e5 AS |
421 | struct dcon_priv *dcon = dev_get_drvdata(dev); |
422 | return sprintf(buf, "%4.4X\n", dcon->disp_mode); | |
eecb3e4e AS |
423 | } |
424 | ||
425 | static ssize_t dcon_sleep_show(struct device *dev, | |
426 | struct device_attribute *attr, char *buf) | |
427 | { | |
428 | ||
bada46e5 | 429 | struct dcon_priv *dcon = dev_get_drvdata(dev); |
9ed62423 | 430 | return sprintf(buf, "%d\n", dcon->asleep); |
eecb3e4e AS |
431 | } |
432 | ||
433 | static ssize_t dcon_freeze_show(struct device *dev, | |
434 | struct device_attribute *attr, char *buf) | |
435 | { | |
bbe963f1 AS |
436 | struct dcon_priv *dcon = dev_get_drvdata(dev); |
437 | return sprintf(buf, "%d\n", dcon->curr_src == DCON_SOURCE_DCON ? 1 : 0); | |
eecb3e4e AS |
438 | } |
439 | ||
bb410354 | 440 | static ssize_t dcon_mono_show(struct device *dev, |
eecb3e4e AS |
441 | struct device_attribute *attr, char *buf) |
442 | { | |
bb410354 | 443 | struct dcon_priv *dcon = dev_get_drvdata(dev); |
9ed62423 | 444 | return sprintf(buf, "%d\n", dcon->mono); |
eecb3e4e AS |
445 | } |
446 | ||
447 | static ssize_t dcon_resumeline_show(struct device *dev, | |
448 | struct device_attribute *attr, char *buf) | |
449 | { | |
450 | return sprintf(buf, "%d\n", resumeline); | |
451 | } | |
452 | ||
bb410354 | 453 | static ssize_t dcon_mono_store(struct device *dev, |
eecb3e4e AS |
454 | struct device_attribute *attr, const char *buf, size_t count) |
455 | { | |
31a3da41 MB |
456 | unsigned long enable_mono; |
457 | int rc; | |
eecb3e4e | 458 | |
88e09a5e | 459 | rc = kstrtoul(buf, 10, &enable_mono); |
31a3da41 MB |
460 | if (rc) |
461 | return rc; | |
eecb3e4e | 462 | |
9ed62423 | 463 | dcon_set_mono_mode(dev_get_drvdata(dev), enable_mono ? true : false); |
eecb3e4e | 464 | |
31a3da41 | 465 | return count; |
eecb3e4e AS |
466 | } |
467 | ||
468 | static ssize_t dcon_freeze_store(struct device *dev, | |
469 | struct device_attribute *attr, const char *buf, size_t count) | |
470 | { | |
8d2d3dd1 | 471 | struct dcon_priv *dcon = dev_get_drvdata(dev); |
31a3da41 MB |
472 | unsigned long output; |
473 | int ret; | |
eecb3e4e | 474 | |
88e09a5e | 475 | ret = kstrtoul(buf, 10, &output); |
31a3da41 MB |
476 | if (ret) |
477 | return ret; | |
eecb3e4e | 478 | |
31a3da41 | 479 | printk(KERN_INFO "dcon_freeze_store: %lu\n", output); |
eecb3e4e AS |
480 | |
481 | switch (output) { | |
482 | case 0: | |
8d2d3dd1 | 483 | dcon_set_source(dcon, DCON_SOURCE_CPU); |
eecb3e4e AS |
484 | break; |
485 | case 1: | |
8d2d3dd1 | 486 | dcon_set_source_sync(dcon, DCON_SOURCE_DCON); |
eecb3e4e | 487 | break; |
e107e6eb | 488 | case 2: /* normally unused */ |
8d2d3dd1 | 489 | dcon_set_source(dcon, DCON_SOURCE_DCON); |
eecb3e4e AS |
490 | break; |
491 | default: | |
492 | return -EINVAL; | |
493 | } | |
494 | ||
495 | return count; | |
496 | } | |
497 | ||
498 | static ssize_t dcon_resumeline_store(struct device *dev, | |
499 | struct device_attribute *attr, const char *buf, size_t count) | |
500 | { | |
31a3da41 MB |
501 | unsigned long rl; |
502 | int rc; | |
eecb3e4e | 503 | |
31a3da41 MB |
504 | rc = strict_strtoul(buf, 10, &rl); |
505 | if (rc) | |
eecb3e4e AS |
506 | return rc; |
507 | ||
508 | resumeline = rl; | |
8d2d3dd1 | 509 | dcon_write(dev_get_drvdata(dev), DCON_REG_SCAN_INT, resumeline); |
eecb3e4e | 510 | |
31a3da41 | 511 | return count; |
eecb3e4e AS |
512 | } |
513 | ||
514 | static ssize_t dcon_sleep_store(struct device *dev, | |
515 | struct device_attribute *attr, const char *buf, size_t count) | |
516 | { | |
31a3da41 MB |
517 | unsigned long output; |
518 | int ret; | |
eecb3e4e | 519 | |
88e09a5e | 520 | ret = kstrtoul(buf, 10, &output); |
31a3da41 MB |
521 | if (ret) |
522 | return ret; | |
eecb3e4e | 523 | |
bada46e5 | 524 | dcon_sleep(dev_get_drvdata(dev), output ? true : false); |
eecb3e4e AS |
525 | return count; |
526 | } | |
527 | ||
528 | static struct device_attribute dcon_device_files[] = { | |
529 | __ATTR(mode, 0444, dcon_mode_show, NULL), | |
530 | __ATTR(sleep, 0644, dcon_sleep_show, dcon_sleep_store), | |
531 | __ATTR(freeze, 0644, dcon_freeze_show, dcon_freeze_store), | |
bb410354 | 532 | __ATTR(monochrome, 0644, dcon_mono_show, dcon_mono_store), |
eecb3e4e AS |
533 | __ATTR(resumeline, 0644, dcon_resumeline_show, dcon_resumeline_store), |
534 | }; | |
535 | ||
c59eef17 AS |
536 | static int dcon_bl_update(struct backlight_device *dev) |
537 | { | |
538 | struct dcon_priv *dcon = bl_get_data(dev); | |
539 | u8 level = dev->props.brightness & 0x0F; | |
540 | ||
541 | if (dev->props.power != FB_BLANK_UNBLANK) | |
542 | level = 0; | |
543 | ||
544 | if (level != dcon->bl_val) | |
545 | dcon_set_backlight(dcon, level); | |
546 | ||
547 | return 0; | |
548 | } | |
549 | ||
550 | static int dcon_bl_get(struct backlight_device *dev) | |
551 | { | |
552 | struct dcon_priv *dcon = bl_get_data(dev); | |
553 | return dcon->bl_val; | |
554 | } | |
555 | ||
acc2472e | 556 | static const struct backlight_ops dcon_bl_ops = { |
c59eef17 AS |
557 | .update_status = dcon_bl_update, |
558 | .get_brightness = dcon_bl_get, | |
eecb3e4e AS |
559 | }; |
560 | ||
c59eef17 AS |
561 | static struct backlight_properties dcon_bl_props = { |
562 | .max_brightness = 15, | |
bb7ca747 | 563 | .type = BACKLIGHT_RAW, |
c59eef17 AS |
564 | .power = FB_BLANK_UNBLANK, |
565 | }; | |
eecb3e4e | 566 | |
e107e6eb MB |
567 | static int dcon_reboot_notify(struct notifier_block *nb, |
568 | unsigned long foo, void *bar) | |
eecb3e4e | 569 | { |
8d2d3dd1 AS |
570 | struct dcon_priv *dcon = container_of(nb, struct dcon_priv, reboot_nb); |
571 | ||
572 | if (!dcon || !dcon->client) | |
eecb3e4e AS |
573 | return 0; |
574 | ||
575 | /* Turn off the DCON. Entirely. */ | |
8d2d3dd1 AS |
576 | dcon_write(dcon, DCON_REG_MODE, 0x39); |
577 | dcon_write(dcon, DCON_REG_MODE, 0x32); | |
eecb3e4e AS |
578 | return 0; |
579 | } | |
580 | ||
e107e6eb MB |
581 | static int unfreeze_on_panic(struct notifier_block *nb, |
582 | unsigned long e, void *p) | |
eecb3e4e AS |
583 | { |
584 | pdata->set_dconload(1); | |
585 | return NOTIFY_DONE; | |
586 | } | |
587 | ||
588 | static struct notifier_block dcon_panic_nb = { | |
589 | .notifier_call = unfreeze_on_panic, | |
590 | }; | |
591 | ||
95699fb7 AS |
592 | /* |
593 | * When the framebuffer sleeps due to external sources (e.g. user idle), power | |
594 | * down the DCON as well. Power it back up when the fb comes back to life. | |
595 | */ | |
feaa98b2 | 596 | static int dcon_fb_notifier(struct notifier_block *self, |
e107e6eb | 597 | unsigned long event, void *data) |
eecb3e4e AS |
598 | { |
599 | struct fb_event *evdata = data; | |
feaa98b2 AS |
600 | struct dcon_priv *dcon = container_of(self, struct dcon_priv, |
601 | fbevent_nb); | |
eecb3e4e | 602 | int *blank = (int *) evdata->data; |
95699fb7 | 603 | if (((event != FB_EVENT_BLANK) && (event != FB_EVENT_CONBLANK)) || |
45bfe972 | 604 | dcon->ignore_fb_events) |
eecb3e4e | 605 | return 0; |
bada46e5 | 606 | dcon_sleep(dcon, *blank ? true : false); |
eecb3e4e AS |
607 | return 0; |
608 | } | |
609 | ||
eecb3e4e AS |
610 | static int dcon_detect(struct i2c_client *client, struct i2c_board_info *info) |
611 | { | |
612 | strlcpy(info->type, "olpc_dcon", I2C_NAME_SIZE); | |
613 | ||
614 | return 0; | |
615 | } | |
616 | ||
617 | static int dcon_probe(struct i2c_client *client, const struct i2c_device_id *id) | |
618 | { | |
8d2d3dd1 | 619 | struct dcon_priv *dcon; |
a90dcd4f | 620 | int rc, i, j; |
eecb3e4e | 621 | |
097cd83a AS |
622 | if (!pdata) |
623 | return -ENXIO; | |
624 | ||
8d2d3dd1 AS |
625 | dcon = kzalloc(sizeof(*dcon), GFP_KERNEL); |
626 | if (!dcon) | |
627 | return -ENOMEM; | |
628 | ||
629 | dcon->client = client; | |
630 | INIT_WORK(&dcon->switch_source, dcon_source_switch); | |
631 | dcon->reboot_nb.notifier_call = dcon_reboot_notify; | |
632 | dcon->reboot_nb.priority = -1; | |
feaa98b2 | 633 | dcon->fbevent_nb.notifier_call = dcon_fb_notifier; |
8d2d3dd1 AS |
634 | |
635 | i2c_set_clientdata(client, dcon); | |
636 | ||
45bfe972 AS |
637 | if (num_registered_fb < 1) { |
638 | dev_err(&client->dev, "DCON driver requires a registered fb\n"); | |
639 | rc = -EIO; | |
640 | goto einit; | |
641 | } | |
642 | dcon->fbinfo = registered_fb[0]; | |
eecb3e4e | 643 | |
8d2d3dd1 | 644 | rc = dcon_hw_init(dcon, 1); |
eecb3e4e AS |
645 | if (rc) |
646 | goto einit; | |
647 | ||
648 | /* Add the DCON device */ | |
649 | ||
650 | dcon_device = platform_device_alloc("dcon", -1); | |
651 | ||
652 | if (dcon_device == NULL) { | |
e107e6eb | 653 | printk(KERN_ERR "dcon: Unable to create the DCON device\n"); |
eecb3e4e AS |
654 | rc = -ENOMEM; |
655 | goto eirq; | |
656 | } | |
e107e6eb | 657 | rc = platform_device_add(dcon_device); |
8d2d3dd1 | 658 | platform_set_drvdata(dcon_device, dcon); |
eecb3e4e | 659 | |
e107e6eb MB |
660 | if (rc) { |
661 | printk(KERN_ERR "dcon: Unable to add the DCON device\n"); | |
eecb3e4e AS |
662 | goto edev; |
663 | } | |
664 | ||
e107e6eb | 665 | for (i = 0; i < ARRAY_SIZE(dcon_device_files); i++) { |
a90dcd4f MB |
666 | rc = device_create_file(&dcon_device->dev, |
667 | &dcon_device_files[i]); | |
668 | if (rc) { | |
669 | dev_err(&dcon_device->dev, "Cannot create sysfs file\n"); | |
670 | goto ecreate; | |
671 | } | |
672 | } | |
eecb3e4e | 673 | |
c59eef17 | 674 | dcon->bl_val = dcon_read(dcon, DCON_REG_BRIGHT) & 0x0F; |
eecb3e4e | 675 | |
c59eef17 AS |
676 | /* Add the backlight device for the DCON */ |
677 | dcon_bl_props.brightness = dcon->bl_val; | |
678 | dcon->bl_dev = backlight_device_register("dcon-bl", &dcon_device->dev, | |
679 | dcon, &dcon_bl_ops, &dcon_bl_props); | |
680 | if (IS_ERR(dcon->bl_dev)) { | |
681 | dev_err(&client->dev, "cannot register backlight dev (%ld)\n", | |
682 | PTR_ERR(dcon->bl_dev)); | |
683 | dcon->bl_dev = NULL; | |
eecb3e4e AS |
684 | } |
685 | ||
8d2d3dd1 | 686 | register_reboot_notifier(&dcon->reboot_nb); |
eecb3e4e | 687 | atomic_notifier_chain_register(&panic_notifier_list, &dcon_panic_nb); |
feaa98b2 | 688 | fb_register_client(&dcon->fbevent_nb); |
eecb3e4e AS |
689 | |
690 | return 0; | |
691 | ||
a90dcd4f MB |
692 | ecreate: |
693 | for (j = 0; j < i; j++) | |
694 | device_remove_file(&dcon_device->dev, &dcon_device_files[j]); | |
eecb3e4e AS |
695 | edev: |
696 | platform_device_unregister(dcon_device); | |
697 | dcon_device = NULL; | |
eecb3e4e | 698 | eirq: |
bbe963f1 | 699 | free_irq(DCON_IRQ, dcon); |
eecb3e4e | 700 | einit: |
8d2d3dd1 | 701 | kfree(dcon); |
eecb3e4e AS |
702 | return rc; |
703 | } | |
704 | ||
705 | static int dcon_remove(struct i2c_client *client) | |
706 | { | |
8d2d3dd1 AS |
707 | struct dcon_priv *dcon = i2c_get_clientdata(client); |
708 | ||
feaa98b2 | 709 | fb_unregister_client(&dcon->fbevent_nb); |
8d2d3dd1 | 710 | unregister_reboot_notifier(&dcon->reboot_nb); |
eecb3e4e AS |
711 | atomic_notifier_chain_unregister(&panic_notifier_list, &dcon_panic_nb); |
712 | ||
bbe963f1 | 713 | free_irq(DCON_IRQ, dcon); |
eecb3e4e | 714 | |
c59eef17 AS |
715 | if (dcon->bl_dev) |
716 | backlight_device_unregister(dcon->bl_dev); | |
eecb3e4e AS |
717 | |
718 | if (dcon_device != NULL) | |
719 | platform_device_unregister(dcon_device); | |
8d2d3dd1 AS |
720 | cancel_work_sync(&dcon->switch_source); |
721 | ||
722 | kfree(dcon); | |
eecb3e4e | 723 | |
eecb3e4e AS |
724 | return 0; |
725 | } | |
726 | ||
727 | #ifdef CONFIG_PM | |
728 | static int dcon_suspend(struct i2c_client *client, pm_message_t state) | |
729 | { | |
8d2d3dd1 AS |
730 | struct dcon_priv *dcon = i2c_get_clientdata(client); |
731 | ||
bada46e5 | 732 | if (!dcon->asleep) { |
eecb3e4e | 733 | /* Set up the DCON to have the source */ |
8d2d3dd1 | 734 | dcon_set_source_sync(dcon, DCON_SOURCE_DCON); |
eecb3e4e AS |
735 | } |
736 | ||
737 | return 0; | |
738 | } | |
739 | ||
740 | static int dcon_resume(struct i2c_client *client) | |
741 | { | |
8d2d3dd1 AS |
742 | struct dcon_priv *dcon = i2c_get_clientdata(client); |
743 | ||
bada46e5 | 744 | if (!dcon->asleep) { |
8d2d3dd1 AS |
745 | dcon_bus_stabilize(dcon, 0); |
746 | dcon_set_source(dcon, DCON_SOURCE_CPU); | |
eecb3e4e AS |
747 | } |
748 | ||
749 | return 0; | |
750 | } | |
751 | ||
752 | #endif | |
753 | ||
754 | ||
097cd83a | 755 | irqreturn_t dcon_interrupt(int irq, void *id) |
eecb3e4e | 756 | { |
bbe963f1 | 757 | struct dcon_priv *dcon = id; |
91762057 | 758 | u8 status; |
eecb3e4e | 759 | |
91762057 | 760 | if (pdata->read_status(&status)) |
eecb3e4e AS |
761 | return IRQ_NONE; |
762 | ||
763 | switch (status & 3) { | |
764 | case 3: | |
765 | printk(KERN_DEBUG "olpc-dcon: DCONLOAD_MISSED interrupt\n"); | |
766 | break; | |
767 | ||
768 | case 2: /* switch to DCON mode */ | |
769 | case 1: /* switch to CPU mode */ | |
309ef2a2 AS |
770 | dcon->switched = true; |
771 | getnstimeofday(&dcon->irq_time); | |
eecb3e4e AS |
772 | wake_up(&dcon_wait_queue); |
773 | break; | |
774 | ||
775 | case 0: | |
776 | /* workaround resume case: the DCON (on 1.5) doesn't | |
777 | * ever assert status 0x01 when switching to CPU mode | |
778 | * during resume. this is because DCONLOAD is de-asserted | |
779 | * _immediately_ upon exiting S3, so the actual release | |
780 | * of the DCON happened long before this point. | |
781 | * see http://dev.laptop.org/ticket/9869 | |
782 | */ | |
309ef2a2 AS |
783 | if (dcon->curr_src != dcon->pending_src && !dcon->switched) { |
784 | dcon->switched = true; | |
785 | getnstimeofday(&dcon->irq_time); | |
eecb3e4e AS |
786 | wake_up(&dcon_wait_queue); |
787 | printk(KERN_DEBUG "olpc-dcon: switching w/ status 0/0\n"); | |
788 | } else { | |
789 | printk(KERN_DEBUG "olpc-dcon: scanline interrupt w/CPU\n"); | |
790 | } | |
791 | } | |
792 | ||
793 | return IRQ_HANDLED; | |
794 | } | |
795 | ||
56463de0 | 796 | static const struct i2c_device_id dcon_idtable[] = { |
eecb3e4e AS |
797 | { "olpc_dcon", 0 }, |
798 | { } | |
799 | }; | |
800 | ||
801 | MODULE_DEVICE_TABLE(i2c, dcon_idtable); | |
802 | ||
097cd83a | 803 | struct i2c_driver dcon_driver = { |
eecb3e4e AS |
804 | .driver = { |
805 | .name = "olpc_dcon", | |
806 | }, | |
807 | .class = I2C_CLASS_DDC | I2C_CLASS_HWMON, | |
808 | .id_table = dcon_idtable, | |
809 | .probe = dcon_probe, | |
810 | .remove = __devexit_p(dcon_remove), | |
811 | .detect = dcon_detect, | |
812 | .address_list = normal_i2c, | |
813 | #ifdef CONFIG_PM | |
814 | .suspend = dcon_suspend, | |
815 | .resume = dcon_resume, | |
816 | #endif | |
817 | }; | |
818 | ||
eecb3e4e AS |
819 | static int __init olpc_dcon_init(void) |
820 | { | |
097cd83a AS |
821 | #ifdef CONFIG_FB_OLPC_DCON_1_5 |
822 | /* XO-1.5 */ | |
823 | if (olpc_board_at_least(olpc_board(0xd0))) | |
824 | pdata = &dcon_pdata_xo_1_5; | |
825 | #endif | |
826 | #ifdef CONFIG_FB_OLPC_DCON_1 | |
827 | if (!pdata) | |
828 | pdata = &dcon_pdata_xo_1; | |
829 | #endif | |
eecb3e4e | 830 | |
56463de0 | 831 | return i2c_add_driver(&dcon_driver); |
eecb3e4e AS |
832 | } |
833 | ||
834 | static void __exit olpc_dcon_exit(void) | |
835 | { | |
836 | i2c_del_driver(&dcon_driver); | |
837 | } | |
838 | ||
839 | module_init(olpc_dcon_init); | |
840 | module_exit(olpc_dcon_exit); | |
841 | ||
842 | MODULE_LICENSE("GPL"); |