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. | |
7 | * Copyright (c) 2010 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 | ||
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> | |
24 | #include <linux/backlight.h> | |
25 | #include <linux/device.h> | |
26 | #include <linux/notifier.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 | ||
40 | static int noinit; | |
41 | module_param(noinit, int, 0444); | |
42 | ||
43 | /* Default off since it doesn't work on DCON ASIC in B-test OLPC board */ | |
44 | static int useaa = 1; | |
45 | module_param(useaa, int, 0444); | |
46 | ||
47 | struct dcon_platform_data { | |
48 | int (*init)(void); | |
49 | void (*bus_stabilize_wiggle)(void); | |
50 | void (*set_dconload)(int); | |
7637c925 | 51 | u8 (*read_status)(void); |
eecb3e4e AS |
52 | }; |
53 | ||
54 | static struct dcon_platform_data *pdata; | |
55 | ||
8d2d3dd1 AS |
56 | struct dcon_priv { |
57 | struct i2c_client *client; | |
58 | ||
59 | struct work_struct switch_source; | |
60 | struct notifier_block reboot_nb; | |
bb410354 AS |
61 | |
62 | /* Current output type; true == mono, false == color */ | |
63 | bool mono:1; | |
8d2d3dd1 AS |
64 | }; |
65 | ||
eecb3e4e AS |
66 | /* I2C structures */ |
67 | ||
68 | static struct i2c_driver dcon_driver; | |
eecb3e4e AS |
69 | |
70 | /* Platform devices */ | |
71 | static struct platform_device *dcon_device; | |
72 | ||
73 | /* Backlight device */ | |
74 | static struct backlight_device *dcon_bl_dev; | |
75 | ||
76 | static struct fb_info *fbinfo; | |
77 | ||
78 | /* set this to 1 while controlling fb blank state from this driver */ | |
79 | static int ignore_fb_events = 0; | |
80 | ||
81 | /* Current source, initialized at probe time */ | |
82 | static int dcon_source; | |
83 | ||
84 | /* Desired source */ | |
85 | static int dcon_pending; | |
86 | ||
eecb3e4e AS |
87 | /* Current sleep status (not yet implemented) */ |
88 | static int dcon_sleep_val = DCON_ACTIVE; | |
89 | ||
90 | /* Shadow register for the DCON_REG_MODE register */ | |
91 | static unsigned short dcon_disp_mode; | |
92 | ||
93 | /* Variables used during switches */ | |
94 | static int dcon_switched; | |
95 | static struct timespec dcon_irq_time; | |
e107e6eb | 96 | static struct timespec dcon_load_time; |
eecb3e4e AS |
97 | |
98 | static DECLARE_WAIT_QUEUE_HEAD(dcon_wait_queue); | |
99 | ||
100 | static unsigned short normal_i2c[] = { 0x0d, I2C_CLIENT_END }; | |
101 | ||
8d2d3dd1 AS |
102 | static s32 dcon_write(struct dcon_priv *dcon, u8 reg, u16 val) |
103 | { | |
104 | return i2c_smbus_write_word_data(dcon->client, reg, val); | |
105 | } | |
106 | ||
107 | static s32 dcon_read(struct dcon_priv *dcon, u8 reg) | |
108 | { | |
109 | return i2c_smbus_read_word_data(dcon->client, reg); | |
110 | } | |
eecb3e4e AS |
111 | |
112 | /* The current backlight value - this saves us some smbus traffic */ | |
113 | static int bl_val = -1; | |
114 | ||
115 | /* ===== API functions - these are called by a variety of users ==== */ | |
116 | ||
8d2d3dd1 | 117 | static int dcon_hw_init(struct dcon_priv *dcon, int is_init) |
eecb3e4e | 118 | { |
8d2d3dd1 | 119 | struct i2c_client *client = dcon->client; |
eecb3e4e AS |
120 | uint16_t ver; |
121 | int rc = 0; | |
122 | ||
123 | ver = i2c_smbus_read_word_data(client, DCON_REG_ID); | |
124 | if ((ver >> 8) != 0xDC) { | |
125 | printk(KERN_ERR "olpc-dcon: DCON ID not 0xDCxx: 0x%04x " | |
126 | "instead.\n", ver); | |
127 | rc = -ENXIO; | |
128 | goto err; | |
129 | } | |
130 | ||
131 | if (is_init) { | |
132 | printk(KERN_INFO "olpc-dcon: Discovered DCON version %x\n", | |
133 | ver & 0xFF); | |
e107e6eb MB |
134 | rc = pdata->init(); |
135 | if (rc != 0) { | |
eecb3e4e AS |
136 | printk(KERN_ERR "olpc-dcon: Unable to init.\n"); |
137 | goto err; | |
138 | } | |
139 | } | |
140 | ||
141 | if (ver < 0xdc02 && !noinit) { | |
142 | /* Initialize the DCON registers */ | |
143 | ||
144 | /* Start with work-arounds for DCON ASIC */ | |
145 | i2c_smbus_write_word_data(client, 0x4b, 0x00cc); | |
146 | i2c_smbus_write_word_data(client, 0x4b, 0x00cc); | |
147 | i2c_smbus_write_word_data(client, 0x4b, 0x00cc); | |
148 | i2c_smbus_write_word_data(client, 0x0b, 0x007a); | |
149 | i2c_smbus_write_word_data(client, 0x36, 0x025c); | |
150 | i2c_smbus_write_word_data(client, 0x37, 0x025e); | |
e107e6eb | 151 | |
eecb3e4e AS |
152 | /* Initialise SDRAM */ |
153 | ||
154 | i2c_smbus_write_word_data(client, 0x3b, 0x002b); | |
155 | i2c_smbus_write_word_data(client, 0x41, 0x0101); | |
156 | i2c_smbus_write_word_data(client, 0x42, 0x0101); | |
e107e6eb | 157 | } else if (!noinit) { |
eecb3e4e AS |
158 | /* SDRAM setup/hold time */ |
159 | i2c_smbus_write_word_data(client, 0x3a, 0xc040); | |
160 | i2c_smbus_write_word_data(client, 0x41, 0x0000); | |
161 | i2c_smbus_write_word_data(client, 0x41, 0x0101); | |
162 | i2c_smbus_write_word_data(client, 0x42, 0x0101); | |
163 | } | |
164 | ||
165 | /* Colour swizzle, AA, no passthrough, backlight */ | |
166 | if (is_init) { | |
167 | dcon_disp_mode = MODE_PASSTHRU | MODE_BL_ENABLE | MODE_CSWIZZLE; | |
168 | if (useaa) | |
169 | dcon_disp_mode |= MODE_COL_AA; | |
170 | } | |
171 | i2c_smbus_write_word_data(client, DCON_REG_MODE, dcon_disp_mode); | |
172 | ||
173 | ||
174 | /* Set the scanline to interrupt on during resume */ | |
175 | i2c_smbus_write_word_data(client, DCON_REG_SCAN_INT, resumeline); | |
176 | ||
177 | err: | |
178 | return rc; | |
179 | } | |
180 | ||
181 | /* | |
182 | * The smbus doesn't always come back due to what is believed to be | |
183 | * hardware (power rail) bugs. For older models where this is known to | |
184 | * occur, our solution is to attempt to wait for the bus to stabilize; | |
185 | * if it doesn't happen, cut power to the dcon, repower it, and wait | |
186 | * for the bus to stabilize. Rinse, repeat until we have a working | |
187 | * smbus. For newer models, we simply BUG(); we want to know if this | |
188 | * still happens despite the power fixes that have been made! | |
189 | */ | |
8d2d3dd1 | 190 | static int dcon_bus_stabilize(struct dcon_priv *dcon, int is_powered_down) |
eecb3e4e AS |
191 | { |
192 | unsigned long timeout; | |
193 | int x; | |
194 | ||
195 | power_up: | |
196 | if (is_powered_down) { | |
197 | x = 1; | |
e107e6eb MB |
198 | x = olpc_ec_cmd(0x26, (unsigned char *) &x, 1, NULL, 0); |
199 | if (x) { | |
eecb3e4e AS |
200 | printk(KERN_WARNING "olpc-dcon: unable to force dcon " |
201 | "to power up: %d!\n", x); | |
202 | return x; | |
203 | } | |
204 | msleep(10); /* we'll be conservative */ | |
205 | } | |
e107e6eb | 206 | |
eecb3e4e AS |
207 | pdata->bus_stabilize_wiggle(); |
208 | ||
209 | for (x = -1, timeout = 50; timeout && x < 0; timeout--) { | |
210 | msleep(1); | |
8d2d3dd1 | 211 | x = dcon_read(dcon, DCON_REG_ID); |
eecb3e4e AS |
212 | } |
213 | if (x < 0) { | |
214 | printk(KERN_ERR "olpc-dcon: unable to stabilize dcon's " | |
215 | "smbus, reasserting power and praying.\n"); | |
316604be | 216 | BUG_ON(olpc_board_at_least(olpc_board(0xc2))); |
eecb3e4e AS |
217 | x = 0; |
218 | olpc_ec_cmd(0x26, (unsigned char *) &x, 1, NULL, 0); | |
219 | msleep(100); | |
220 | is_powered_down = 1; | |
221 | goto power_up; /* argh, stupid hardware.. */ | |
222 | } | |
223 | ||
224 | if (is_powered_down) | |
8d2d3dd1 | 225 | return dcon_hw_init(dcon, 0); |
eecb3e4e AS |
226 | return 0; |
227 | } | |
228 | ||
8d2d3dd1 | 229 | static int dcon_get_backlight(struct dcon_priv *dcon) |
eecb3e4e | 230 | { |
8d2d3dd1 | 231 | if (!dcon || !dcon->client) |
eecb3e4e AS |
232 | return 0; |
233 | ||
234 | if (bl_val == -1) | |
8d2d3dd1 | 235 | bl_val = dcon_read(dcon, DCON_REG_BRIGHT) & 0x0F; |
eecb3e4e AS |
236 | |
237 | return bl_val; | |
238 | } | |
239 | ||
240 | ||
8d2d3dd1 | 241 | static void dcon_set_backlight_hw(struct dcon_priv *dcon, int level) |
eecb3e4e AS |
242 | { |
243 | bl_val = level & 0x0F; | |
8d2d3dd1 | 244 | dcon_write(dcon, DCON_REG_BRIGHT, bl_val); |
eecb3e4e AS |
245 | |
246 | /* Purposely turn off the backlight when we go to level 0 */ | |
247 | if (bl_val == 0) { | |
248 | dcon_disp_mode &= ~MODE_BL_ENABLE; | |
8d2d3dd1 | 249 | dcon_write(dcon, DCON_REG_MODE, dcon_disp_mode); |
eecb3e4e AS |
250 | } else if (!(dcon_disp_mode & MODE_BL_ENABLE)) { |
251 | dcon_disp_mode |= MODE_BL_ENABLE; | |
8d2d3dd1 | 252 | dcon_write(dcon, DCON_REG_MODE, dcon_disp_mode); |
eecb3e4e AS |
253 | } |
254 | } | |
255 | ||
8d2d3dd1 | 256 | static void dcon_set_backlight(struct dcon_priv *dcon, int level) |
eecb3e4e | 257 | { |
8d2d3dd1 | 258 | if (!dcon || !dcon->client) |
eecb3e4e AS |
259 | return; |
260 | ||
261 | if (bl_val == (level & 0x0F)) | |
262 | return; | |
263 | ||
8d2d3dd1 | 264 | dcon_set_backlight_hw(dcon, level); |
eecb3e4e AS |
265 | } |
266 | ||
267 | /* Set the output type to either color or mono */ | |
bb410354 | 268 | static int dcon_set_mono_mode(struct dcon_priv *dcon, bool enable_mono) |
eecb3e4e | 269 | { |
bb410354 | 270 | if (dcon->mono == enable_mono) |
eecb3e4e AS |
271 | return 0; |
272 | ||
bb410354 | 273 | dcon->mono = enable_mono; |
eecb3e4e | 274 | |
bb410354 | 275 | if (enable_mono) { |
eecb3e4e AS |
276 | dcon_disp_mode &= ~(MODE_CSWIZZLE | MODE_COL_AA); |
277 | dcon_disp_mode |= MODE_MONO_LUMA; | |
e107e6eb | 278 | } else { |
eecb3e4e AS |
279 | dcon_disp_mode &= ~(MODE_MONO_LUMA); |
280 | dcon_disp_mode |= MODE_CSWIZZLE; | |
281 | if (useaa) | |
282 | dcon_disp_mode |= MODE_COL_AA; | |
283 | } | |
284 | ||
8d2d3dd1 | 285 | dcon_write(dcon, DCON_REG_MODE, dcon_disp_mode); |
eecb3e4e AS |
286 | return 0; |
287 | } | |
288 | ||
289 | /* For now, this will be really stupid - we need to address how | |
290 | * DCONLOAD works in a sleep and account for it accordingly | |
291 | */ | |
292 | ||
8d2d3dd1 | 293 | static void dcon_sleep(struct dcon_priv *dcon, int state) |
eecb3e4e AS |
294 | { |
295 | int x; | |
296 | ||
297 | /* Turn off the backlight and put the DCON to sleep */ | |
298 | ||
299 | if (state == dcon_sleep_val) | |
300 | return; | |
301 | ||
316604be | 302 | if (!olpc_board_at_least(olpc_board(0xc2))) |
eecb3e4e AS |
303 | return; |
304 | ||
305 | if (state == DCON_SLEEP) { | |
306 | x = 0; | |
e107e6eb MB |
307 | x = olpc_ec_cmd(0x26, (unsigned char *) &x, 1, NULL, 0); |
308 | if (x) | |
eecb3e4e AS |
309 | printk(KERN_WARNING "olpc-dcon: unable to force dcon " |
310 | "to power down: %d!\n", x); | |
311 | else | |
312 | dcon_sleep_val = state; | |
e107e6eb | 313 | } else { |
eecb3e4e AS |
314 | /* Only re-enable the backlight if the backlight value is set */ |
315 | if (bl_val != 0) | |
316 | dcon_disp_mode |= MODE_BL_ENABLE; | |
8d2d3dd1 | 317 | x = dcon_bus_stabilize(dcon, 1); |
e107e6eb | 318 | if (x) |
eecb3e4e AS |
319 | printk(KERN_WARNING "olpc-dcon: unable to reinit dcon" |
320 | " hardware: %d!\n", x); | |
321 | else | |
322 | dcon_sleep_val = state; | |
323 | ||
324 | /* Restore backlight */ | |
8d2d3dd1 | 325 | dcon_set_backlight_hw(dcon, bl_val); |
eecb3e4e AS |
326 | } |
327 | ||
328 | /* We should turn off some stuff in the framebuffer - but what? */ | |
329 | } | |
330 | ||
331 | /* the DCON seems to get confused if we change DCONLOAD too | |
e107e6eb | 332 | * frequently -- i.e., approximately faster than frame time. |
eecb3e4e AS |
333 | * normally we don't change it this fast, so in general we won't |
334 | * delay here. | |
335 | */ | |
336 | void dcon_load_holdoff(void) | |
337 | { | |
338 | struct timespec delta_t, now; | |
e107e6eb | 339 | while (1) { |
eecb3e4e AS |
340 | getnstimeofday(&now); |
341 | delta_t = timespec_sub(now, dcon_load_time); | |
342 | if (delta_t.tv_sec != 0 || | |
343 | delta_t.tv_nsec > NSEC_PER_MSEC * 20) { | |
344 | break; | |
345 | } | |
346 | mdelay(4); | |
347 | } | |
348 | } | |
349 | /* Set the source of the display (CPU or DCON) */ | |
350 | ||
351 | static void dcon_source_switch(struct work_struct *work) | |
352 | { | |
8d2d3dd1 AS |
353 | struct dcon_priv *dcon = container_of(work, struct dcon_priv, |
354 | switch_source); | |
eecb3e4e AS |
355 | DECLARE_WAITQUEUE(wait, current); |
356 | int source = dcon_pending; | |
357 | ||
358 | if (dcon_source == source) | |
359 | return; | |
360 | ||
361 | dcon_load_holdoff(); | |
362 | ||
363 | dcon_switched = 0; | |
364 | ||
365 | switch (source) { | |
366 | case DCON_SOURCE_CPU: | |
367 | printk("dcon_source_switch to CPU\n"); | |
368 | /* Enable the scanline interrupt bit */ | |
8d2d3dd1 AS |
369 | if (dcon_write(dcon, DCON_REG_MODE, |
370 | dcon_disp_mode | MODE_SCAN_INT)) | |
e107e6eb MB |
371 | printk(KERN_ERR |
372 | "olpc-dcon: couldn't enable scanline interrupt!\n"); | |
eecb3e4e AS |
373 | else { |
374 | /* Wait up to one second for the scanline interrupt */ | |
e107e6eb MB |
375 | wait_event_timeout(dcon_wait_queue, |
376 | dcon_switched == 1, HZ); | |
eecb3e4e AS |
377 | } |
378 | ||
379 | if (!dcon_switched) | |
380 | printk(KERN_ERR "olpc-dcon: Timeout entering CPU mode; expect a screen glitch.\n"); | |
381 | ||
382 | /* Turn off the scanline interrupt */ | |
8d2d3dd1 | 383 | if (dcon_write(dcon, DCON_REG_MODE, dcon_disp_mode)) |
eecb3e4e AS |
384 | printk(KERN_ERR "olpc-dcon: couldn't disable scanline interrupt!\n"); |
385 | ||
386 | /* | |
387 | * Ideally we'd like to disable interrupts here so that the | |
388 | * fb unblanking and DCON turn on happen at a known time value; | |
389 | * however, we can't do that right now with fb_blank | |
390 | * messing with semaphores. | |
391 | * | |
392 | * For now, we just hope.. | |
393 | */ | |
ac751efa | 394 | console_lock(); |
eecb3e4e AS |
395 | ignore_fb_events = 1; |
396 | if (fb_blank(fbinfo, FB_BLANK_UNBLANK)) { | |
397 | ignore_fb_events = 0; | |
ac751efa | 398 | console_unlock(); |
eecb3e4e AS |
399 | printk(KERN_ERR "olpc-dcon: Failed to enter CPU mode\n"); |
400 | dcon_pending = DCON_SOURCE_DCON; | |
401 | return; | |
402 | } | |
403 | ignore_fb_events = 0; | |
ac751efa | 404 | console_unlock(); |
eecb3e4e AS |
405 | |
406 | /* And turn off the DCON */ | |
407 | pdata->set_dconload(1); | |
408 | getnstimeofday(&dcon_load_time); | |
409 | ||
410 | printk(KERN_INFO "olpc-dcon: The CPU has control\n"); | |
411 | break; | |
412 | case DCON_SOURCE_DCON: | |
413 | { | |
414 | int t; | |
415 | struct timespec delta_t; | |
416 | ||
e107e6eb | 417 | printk(KERN_INFO "dcon_source_switch to DCON\n"); |
eecb3e4e AS |
418 | |
419 | add_wait_queue(&dcon_wait_queue, &wait); | |
420 | set_current_state(TASK_UNINTERRUPTIBLE); | |
421 | ||
422 | /* Clear DCONLOAD - this implies that the DCON is in control */ | |
423 | pdata->set_dconload(0); | |
424 | getnstimeofday(&dcon_load_time); | |
425 | ||
426 | t = schedule_timeout(HZ/2); | |
427 | remove_wait_queue(&dcon_wait_queue, &wait); | |
428 | set_current_state(TASK_RUNNING); | |
429 | ||
430 | if (!dcon_switched) { | |
431 | printk(KERN_ERR "olpc-dcon: Timeout entering DCON mode; expect a screen glitch.\n"); | |
432 | } else { | |
433 | /* sometimes the DCON doesn't follow its own rules, | |
434 | * and doesn't wait for two vsync pulses before | |
435 | * ack'ing the frame load with an IRQ. the result | |
436 | * is that the display shows the *previously* | |
437 | * loaded frame. we can detect this by looking at | |
438 | * the time between asserting DCONLOAD and the IRQ -- | |
439 | * if it's less than 20msec, then the DCON couldn't | |
440 | * have seen two VSYNC pulses. in that case we | |
e107e6eb | 441 | * deassert and reassert, and hope for the best. |
eecb3e4e AS |
442 | * see http://dev.laptop.org/ticket/9664 |
443 | */ | |
444 | delta_t = timespec_sub(dcon_irq_time, dcon_load_time); | |
445 | if (dcon_switched && delta_t.tv_sec == 0 && | |
446 | delta_t.tv_nsec < NSEC_PER_MSEC * 20) { | |
447 | printk(KERN_ERR "olpc-dcon: missed loading, retrying\n"); | |
448 | pdata->set_dconload(1); | |
449 | mdelay(41); | |
450 | pdata->set_dconload(0); | |
451 | getnstimeofday(&dcon_load_time); | |
452 | mdelay(41); | |
453 | } | |
454 | } | |
455 | ||
ac751efa | 456 | console_lock(); |
eecb3e4e AS |
457 | ignore_fb_events = 1; |
458 | if (fb_blank(fbinfo, FB_BLANK_POWERDOWN)) | |
459 | printk(KERN_ERR "olpc-dcon: couldn't blank fb!\n"); | |
460 | ignore_fb_events = 0; | |
ac751efa | 461 | console_unlock(); |
eecb3e4e AS |
462 | |
463 | printk(KERN_INFO "olpc-dcon: The DCON has control\n"); | |
464 | break; | |
465 | } | |
466 | default: | |
467 | BUG(); | |
468 | } | |
469 | ||
470 | dcon_source = source; | |
471 | } | |
472 | ||
8d2d3dd1 | 473 | static void dcon_set_source(struct dcon_priv *dcon, int arg) |
eecb3e4e AS |
474 | { |
475 | if (dcon_pending == arg) | |
476 | return; | |
477 | ||
478 | dcon_pending = arg; | |
479 | ||
8d2d3dd1 AS |
480 | if ((dcon_source != arg) && !work_pending(&dcon->switch_source)) |
481 | schedule_work(&dcon->switch_source); | |
eecb3e4e AS |
482 | } |
483 | ||
8d2d3dd1 | 484 | static void dcon_set_source_sync(struct dcon_priv *dcon, int arg) |
eecb3e4e | 485 | { |
8d2d3dd1 | 486 | dcon_set_source(dcon, arg); |
eecb3e4e AS |
487 | flush_scheduled_work(); |
488 | } | |
489 | ||
e107e6eb MB |
490 | static int dconbl_set(struct backlight_device *dev) |
491 | { | |
8d2d3dd1 | 492 | struct dcon_priv *dcon = bl_get_data(dev); |
eecb3e4e AS |
493 | int level = dev->props.brightness; |
494 | ||
495 | if (dev->props.power != FB_BLANK_UNBLANK) | |
496 | level = 0; | |
497 | ||
8d2d3dd1 | 498 | dcon_set_backlight(dcon, level); |
eecb3e4e AS |
499 | return 0; |
500 | } | |
501 | ||
e107e6eb MB |
502 | static int dconbl_get(struct backlight_device *dev) |
503 | { | |
8d2d3dd1 AS |
504 | struct dcon_priv *dcon = bl_get_data(dev); |
505 | return dcon_get_backlight(dcon); | |
eecb3e4e AS |
506 | } |
507 | ||
508 | static ssize_t dcon_mode_show(struct device *dev, | |
509 | struct device_attribute *attr, char *buf) | |
510 | { | |
511 | return sprintf(buf, "%4.4X\n", dcon_disp_mode); | |
512 | } | |
513 | ||
514 | static ssize_t dcon_sleep_show(struct device *dev, | |
515 | struct device_attribute *attr, char *buf) | |
516 | { | |
517 | ||
518 | return sprintf(buf, "%d\n", dcon_sleep_val); | |
519 | } | |
520 | ||
521 | static ssize_t dcon_freeze_show(struct device *dev, | |
522 | struct device_attribute *attr, char *buf) | |
523 | { | |
524 | return sprintf(buf, "%d\n", dcon_source == DCON_SOURCE_DCON ? 1 : 0); | |
525 | } | |
526 | ||
bb410354 | 527 | static ssize_t dcon_mono_show(struct device *dev, |
eecb3e4e AS |
528 | struct device_attribute *attr, char *buf) |
529 | { | |
bb410354 AS |
530 | struct dcon_priv *dcon = dev_get_drvdata(dev); |
531 | return sprintf(buf, "%d\n", dcon->mono ? 1 : 0); | |
eecb3e4e AS |
532 | } |
533 | ||
534 | static ssize_t dcon_resumeline_show(struct device *dev, | |
535 | struct device_attribute *attr, char *buf) | |
536 | { | |
537 | return sprintf(buf, "%d\n", resumeline); | |
538 | } | |
539 | ||
540 | static int _strtoul(const char *buf, int len, unsigned int *val) | |
541 | { | |
542 | ||
543 | char *endp; | |
fe2d5b43 | 544 | unsigned int output = simple_strtoul(buf, &endp, 0); |
eecb3e4e AS |
545 | int size = endp - buf; |
546 | ||
547 | if (*endp && isspace(*endp)) | |
548 | size++; | |
549 | ||
550 | if (size != len) | |
551 | return -EINVAL; | |
552 | ||
553 | *val = output; | |
554 | return 0; | |
555 | } | |
556 | ||
bb410354 | 557 | static ssize_t dcon_mono_store(struct device *dev, |
eecb3e4e AS |
558 | struct device_attribute *attr, const char *buf, size_t count) |
559 | { | |
bb410354 | 560 | int enable_mono; |
eecb3e4e AS |
561 | int rc = -EINVAL; |
562 | ||
bb410354 | 563 | if (_strtoul(buf, count, &enable_mono)) |
eecb3e4e AS |
564 | return -EINVAL; |
565 | ||
bb410354 AS |
566 | dcon_set_mono_mode(dev_get_drvdata(dev), enable_mono ? 1 : 0); |
567 | rc = count; | |
eecb3e4e AS |
568 | |
569 | return rc; | |
570 | } | |
571 | ||
572 | static ssize_t dcon_freeze_store(struct device *dev, | |
573 | struct device_attribute *attr, const char *buf, size_t count) | |
574 | { | |
8d2d3dd1 | 575 | struct dcon_priv *dcon = dev_get_drvdata(dev); |
eecb3e4e AS |
576 | int output; |
577 | ||
578 | if (_strtoul(buf, count, &output)) | |
579 | return -EINVAL; | |
580 | ||
e107e6eb | 581 | printk(KERN_INFO "dcon_freeze_store: %d\n", output); |
eecb3e4e AS |
582 | |
583 | switch (output) { | |
584 | case 0: | |
8d2d3dd1 | 585 | dcon_set_source(dcon, DCON_SOURCE_CPU); |
eecb3e4e AS |
586 | break; |
587 | case 1: | |
8d2d3dd1 | 588 | dcon_set_source_sync(dcon, DCON_SOURCE_DCON); |
eecb3e4e | 589 | break; |
e107e6eb | 590 | case 2: /* normally unused */ |
8d2d3dd1 | 591 | dcon_set_source(dcon, DCON_SOURCE_DCON); |
eecb3e4e AS |
592 | break; |
593 | default: | |
594 | return -EINVAL; | |
595 | } | |
596 | ||
597 | return count; | |
598 | } | |
599 | ||
600 | static ssize_t dcon_resumeline_store(struct device *dev, | |
601 | struct device_attribute *attr, const char *buf, size_t count) | |
602 | { | |
603 | int rl; | |
604 | int rc = -EINVAL; | |
605 | ||
606 | if (_strtoul(buf, count, &rl)) | |
607 | return rc; | |
608 | ||
609 | resumeline = rl; | |
8d2d3dd1 | 610 | dcon_write(dev_get_drvdata(dev), DCON_REG_SCAN_INT, resumeline); |
eecb3e4e AS |
611 | rc = count; |
612 | ||
613 | return rc; | |
614 | } | |
615 | ||
616 | static ssize_t dcon_sleep_store(struct device *dev, | |
617 | struct device_attribute *attr, const char *buf, size_t count) | |
618 | { | |
619 | int output; | |
620 | ||
621 | if (_strtoul(buf, count, &output)) | |
622 | return -EINVAL; | |
623 | ||
8d2d3dd1 | 624 | dcon_sleep(dev_get_drvdata(dev), output ? DCON_SLEEP : DCON_ACTIVE); |
eecb3e4e AS |
625 | return count; |
626 | } | |
627 | ||
628 | static struct device_attribute dcon_device_files[] = { | |
629 | __ATTR(mode, 0444, dcon_mode_show, NULL), | |
630 | __ATTR(sleep, 0644, dcon_sleep_show, dcon_sleep_store), | |
631 | __ATTR(freeze, 0644, dcon_freeze_show, dcon_freeze_store), | |
bb410354 | 632 | __ATTR(monochrome, 0644, dcon_mono_show, dcon_mono_store), |
eecb3e4e AS |
633 | __ATTR(resumeline, 0644, dcon_resumeline_show, dcon_resumeline_store), |
634 | }; | |
635 | ||
acc2472e | 636 | static const struct backlight_ops dcon_bl_ops = { |
eecb3e4e AS |
637 | .get_brightness = dconbl_get, |
638 | .update_status = dconbl_set | |
639 | }; | |
640 | ||
641 | ||
e107e6eb MB |
642 | static int dcon_reboot_notify(struct notifier_block *nb, |
643 | unsigned long foo, void *bar) | |
eecb3e4e | 644 | { |
8d2d3dd1 AS |
645 | struct dcon_priv *dcon = container_of(nb, struct dcon_priv, reboot_nb); |
646 | ||
647 | if (!dcon || !dcon->client) | |
eecb3e4e AS |
648 | return 0; |
649 | ||
650 | /* Turn off the DCON. Entirely. */ | |
8d2d3dd1 AS |
651 | dcon_write(dcon, DCON_REG_MODE, 0x39); |
652 | dcon_write(dcon, DCON_REG_MODE, 0x32); | |
eecb3e4e AS |
653 | return 0; |
654 | } | |
655 | ||
e107e6eb MB |
656 | static int unfreeze_on_panic(struct notifier_block *nb, |
657 | unsigned long e, void *p) | |
eecb3e4e AS |
658 | { |
659 | pdata->set_dconload(1); | |
660 | return NOTIFY_DONE; | |
661 | } | |
662 | ||
663 | static struct notifier_block dcon_panic_nb = { | |
664 | .notifier_call = unfreeze_on_panic, | |
665 | }; | |
666 | ||
95699fb7 AS |
667 | /* |
668 | * When the framebuffer sleeps due to external sources (e.g. user idle), power | |
669 | * down the DCON as well. Power it back up when the fb comes back to life. | |
670 | */ | |
e107e6eb MB |
671 | static int fb_notifier_callback(struct notifier_block *self, |
672 | unsigned long event, void *data) | |
eecb3e4e AS |
673 | { |
674 | struct fb_event *evdata = data; | |
8d2d3dd1 AS |
675 | struct backlight_device *bl = container_of(self, |
676 | struct backlight_device, fb_notif); | |
677 | struct dcon_priv *dcon = bl_get_data(bl); | |
eecb3e4e | 678 | int *blank = (int *) evdata->data; |
95699fb7 AS |
679 | if (((event != FB_EVENT_BLANK) && (event != FB_EVENT_CONBLANK)) || |
680 | ignore_fb_events) | |
eecb3e4e | 681 | return 0; |
8d2d3dd1 | 682 | dcon_sleep(dcon, (*blank) ? DCON_SLEEP : DCON_ACTIVE); |
eecb3e4e AS |
683 | return 0; |
684 | } | |
685 | ||
686 | static struct notifier_block fb_nb = { | |
687 | .notifier_call = fb_notifier_callback, | |
688 | }; | |
689 | ||
690 | static int dcon_detect(struct i2c_client *client, struct i2c_board_info *info) | |
691 | { | |
692 | strlcpy(info->type, "olpc_dcon", I2C_NAME_SIZE); | |
693 | ||
694 | return 0; | |
695 | } | |
696 | ||
697 | static int dcon_probe(struct i2c_client *client, const struct i2c_device_id *id) | |
698 | { | |
8d2d3dd1 | 699 | struct dcon_priv *dcon; |
a90dcd4f | 700 | int rc, i, j; |
eecb3e4e | 701 | |
8d2d3dd1 AS |
702 | dcon = kzalloc(sizeof(*dcon), GFP_KERNEL); |
703 | if (!dcon) | |
704 | return -ENOMEM; | |
705 | ||
706 | dcon->client = client; | |
707 | INIT_WORK(&dcon->switch_source, dcon_source_switch); | |
708 | dcon->reboot_nb.notifier_call = dcon_reboot_notify; | |
709 | dcon->reboot_nb.priority = -1; | |
710 | ||
711 | i2c_set_clientdata(client, dcon); | |
712 | ||
eecb3e4e AS |
713 | if (num_registered_fb >= 1) |
714 | fbinfo = registered_fb[0]; | |
715 | ||
8d2d3dd1 | 716 | rc = dcon_hw_init(dcon, 1); |
eecb3e4e AS |
717 | if (rc) |
718 | goto einit; | |
719 | ||
720 | /* Add the DCON device */ | |
721 | ||
722 | dcon_device = platform_device_alloc("dcon", -1); | |
723 | ||
724 | if (dcon_device == NULL) { | |
e107e6eb | 725 | printk(KERN_ERR "dcon: Unable to create the DCON device\n"); |
eecb3e4e AS |
726 | rc = -ENOMEM; |
727 | goto eirq; | |
728 | } | |
e107e6eb | 729 | rc = platform_device_add(dcon_device); |
8d2d3dd1 | 730 | platform_set_drvdata(dcon_device, dcon); |
eecb3e4e | 731 | |
e107e6eb MB |
732 | if (rc) { |
733 | printk(KERN_ERR "dcon: Unable to add the DCON device\n"); | |
eecb3e4e AS |
734 | goto edev; |
735 | } | |
736 | ||
e107e6eb | 737 | for (i = 0; i < ARRAY_SIZE(dcon_device_files); i++) { |
a90dcd4f MB |
738 | rc = device_create_file(&dcon_device->dev, |
739 | &dcon_device_files[i]); | |
740 | if (rc) { | |
741 | dev_err(&dcon_device->dev, "Cannot create sysfs file\n"); | |
742 | goto ecreate; | |
743 | } | |
744 | } | |
eecb3e4e AS |
745 | |
746 | /* Add the backlight device for the DCON */ | |
eecb3e4e | 747 | dcon_bl_dev = backlight_device_register("dcon-bl", &dcon_device->dev, |
8d2d3dd1 | 748 | dcon, &dcon_bl_ops, NULL); |
eecb3e4e AS |
749 | |
750 | if (IS_ERR(dcon_bl_dev)) { | |
e107e6eb MB |
751 | printk(KERN_ERR "Cannot register the backlight device (%ld)\n", |
752 | PTR_ERR(dcon_bl_dev)); | |
eecb3e4e | 753 | dcon_bl_dev = NULL; |
e107e6eb | 754 | } else { |
eecb3e4e AS |
755 | dcon_bl_dev->props.max_brightness = 15; |
756 | dcon_bl_dev->props.power = FB_BLANK_UNBLANK; | |
8d2d3dd1 | 757 | dcon_bl_dev->props.brightness = dcon_get_backlight(dcon); |
eecb3e4e AS |
758 | |
759 | backlight_update_status(dcon_bl_dev); | |
760 | } | |
761 | ||
8d2d3dd1 | 762 | register_reboot_notifier(&dcon->reboot_nb); |
eecb3e4e AS |
763 | atomic_notifier_chain_register(&panic_notifier_list, &dcon_panic_nb); |
764 | fb_register_client(&fb_nb); | |
765 | ||
766 | return 0; | |
767 | ||
a90dcd4f MB |
768 | ecreate: |
769 | for (j = 0; j < i; j++) | |
770 | device_remove_file(&dcon_device->dev, &dcon_device_files[j]); | |
eecb3e4e AS |
771 | edev: |
772 | platform_device_unregister(dcon_device); | |
773 | dcon_device = NULL; | |
eecb3e4e AS |
774 | eirq: |
775 | free_irq(DCON_IRQ, &dcon_driver); | |
776 | einit: | |
8d2d3dd1 AS |
777 | i2c_set_clientdata(client, NULL); |
778 | kfree(dcon); | |
eecb3e4e AS |
779 | return rc; |
780 | } | |
781 | ||
782 | static int dcon_remove(struct i2c_client *client) | |
783 | { | |
8d2d3dd1 AS |
784 | struct dcon_priv *dcon = i2c_get_clientdata(client); |
785 | ||
786 | i2c_set_clientdata(client, NULL); | |
eecb3e4e AS |
787 | |
788 | fb_unregister_client(&fb_nb); | |
8d2d3dd1 | 789 | unregister_reboot_notifier(&dcon->reboot_nb); |
eecb3e4e AS |
790 | atomic_notifier_chain_unregister(&panic_notifier_list, &dcon_panic_nb); |
791 | ||
792 | free_irq(DCON_IRQ, &dcon_driver); | |
793 | ||
794 | if (dcon_bl_dev != NULL) | |
795 | backlight_device_unregister(dcon_bl_dev); | |
796 | ||
797 | if (dcon_device != NULL) | |
798 | platform_device_unregister(dcon_device); | |
8d2d3dd1 AS |
799 | cancel_work_sync(&dcon->switch_source); |
800 | ||
801 | kfree(dcon); | |
eecb3e4e | 802 | |
eecb3e4e AS |
803 | return 0; |
804 | } | |
805 | ||
806 | #ifdef CONFIG_PM | |
807 | static int dcon_suspend(struct i2c_client *client, pm_message_t state) | |
808 | { | |
8d2d3dd1 AS |
809 | struct dcon_priv *dcon = i2c_get_clientdata(client); |
810 | ||
eecb3e4e AS |
811 | if (dcon_sleep_val == DCON_ACTIVE) { |
812 | /* Set up the DCON to have the source */ | |
8d2d3dd1 | 813 | dcon_set_source_sync(dcon, DCON_SOURCE_DCON); |
eecb3e4e AS |
814 | } |
815 | ||
816 | return 0; | |
817 | } | |
818 | ||
819 | static int dcon_resume(struct i2c_client *client) | |
820 | { | |
8d2d3dd1 AS |
821 | struct dcon_priv *dcon = i2c_get_clientdata(client); |
822 | ||
eecb3e4e | 823 | if (dcon_sleep_val == DCON_ACTIVE) { |
8d2d3dd1 AS |
824 | dcon_bus_stabilize(dcon, 0); |
825 | dcon_set_source(dcon, DCON_SOURCE_CPU); | |
eecb3e4e AS |
826 | } |
827 | ||
828 | return 0; | |
829 | } | |
830 | ||
831 | #endif | |
832 | ||
833 | ||
834 | static irqreturn_t dcon_interrupt(int irq, void *id) | |
835 | { | |
836 | int status = pdata->read_status(); | |
837 | ||
838 | if (status == -1) | |
839 | return IRQ_NONE; | |
840 | ||
841 | switch (status & 3) { | |
842 | case 3: | |
843 | printk(KERN_DEBUG "olpc-dcon: DCONLOAD_MISSED interrupt\n"); | |
844 | break; | |
845 | ||
846 | case 2: /* switch to DCON mode */ | |
847 | case 1: /* switch to CPU mode */ | |
848 | dcon_switched = 1; | |
849 | getnstimeofday(&dcon_irq_time); | |
850 | wake_up(&dcon_wait_queue); | |
851 | break; | |
852 | ||
853 | case 0: | |
854 | /* workaround resume case: the DCON (on 1.5) doesn't | |
855 | * ever assert status 0x01 when switching to CPU mode | |
856 | * during resume. this is because DCONLOAD is de-asserted | |
857 | * _immediately_ upon exiting S3, so the actual release | |
858 | * of the DCON happened long before this point. | |
859 | * see http://dev.laptop.org/ticket/9869 | |
860 | */ | |
861 | if (dcon_source != dcon_pending && !dcon_switched) { | |
862 | dcon_switched = 1; | |
863 | getnstimeofday(&dcon_irq_time); | |
864 | wake_up(&dcon_wait_queue); | |
865 | printk(KERN_DEBUG "olpc-dcon: switching w/ status 0/0\n"); | |
866 | } else { | |
867 | printk(KERN_DEBUG "olpc-dcon: scanline interrupt w/CPU\n"); | |
868 | } | |
869 | } | |
870 | ||
871 | return IRQ_HANDLED; | |
872 | } | |
873 | ||
874 | static struct i2c_device_id dcon_idtable[] = { | |
875 | { "olpc_dcon", 0 }, | |
876 | { } | |
877 | }; | |
878 | ||
879 | MODULE_DEVICE_TABLE(i2c, dcon_idtable); | |
880 | ||
881 | static struct i2c_driver dcon_driver = { | |
882 | .driver = { | |
883 | .name = "olpc_dcon", | |
884 | }, | |
885 | .class = I2C_CLASS_DDC | I2C_CLASS_HWMON, | |
886 | .id_table = dcon_idtable, | |
887 | .probe = dcon_probe, | |
888 | .remove = __devexit_p(dcon_remove), | |
889 | .detect = dcon_detect, | |
890 | .address_list = normal_i2c, | |
891 | #ifdef CONFIG_PM | |
892 | .suspend = dcon_suspend, | |
893 | .resume = dcon_resume, | |
894 | #endif | |
895 | }; | |
896 | ||
eecb3e4e | 897 | #include "olpc_dcon_xo_1.c" |
eecb3e4e AS |
898 | |
899 | static int __init olpc_dcon_init(void) | |
900 | { | |
eecb3e4e | 901 | pdata = &dcon_pdata_xo_1; |
eecb3e4e AS |
902 | |
903 | i2c_add_driver(&dcon_driver); | |
904 | return 0; | |
905 | } | |
906 | ||
907 | static void __exit olpc_dcon_exit(void) | |
908 | { | |
909 | i2c_del_driver(&dcon_driver); | |
910 | } | |
911 | ||
912 | module_init(olpc_dcon_init); | |
913 | module_exit(olpc_dcon_exit); | |
914 | ||
915 | MODULE_LICENSE("GPL"); |