| 1 | /* |
| 2 | * Mainly by David Woodhouse, somewhat modified by Jordan Crouse |
| 3 | * |
| 4 | * Copyright © 2006-2007 Red Hat, Inc. |
| 5 | * Copyright © 2006-2007 Advanced Micro Devices, Inc. |
| 6 | * Copyright © 2009 VIA Technology, Inc. |
| 7 | * Copyright (c) 2010-2011 Andres Salomon <dilinger@queued.net> |
| 8 | * |
| 9 | * This program is free software. You can redistribute it and/or |
| 10 | * modify it under the terms of version 2 of the GNU General Public |
| 11 | * License as published by the Free Software Foundation. |
| 12 | */ |
| 13 | |
| 14 | |
| 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> |
| 20 | #include <linux/pci.h> |
| 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/uaccess.h> |
| 27 | #include <linux/ctype.h> |
| 28 | #include <linux/reboot.h> |
| 29 | #include <asm/tsc.h> |
| 30 | #include <asm/olpc.h> |
| 31 | |
| 32 | #include "olpc_dcon.h" |
| 33 | |
| 34 | /* Module definitions */ |
| 35 | |
| 36 | static int resumeline = 898; |
| 37 | module_param(resumeline, int, 0444); |
| 38 | |
| 39 | static int noinit; |
| 40 | module_param(noinit, int, 0444); |
| 41 | |
| 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 | |
| 46 | static struct dcon_platform_data *pdata; |
| 47 | |
| 48 | /* I2C structures */ |
| 49 | |
| 50 | /* Platform devices */ |
| 51 | static struct platform_device *dcon_device; |
| 52 | |
| 53 | static DECLARE_WAIT_QUEUE_HEAD(dcon_wait_queue); |
| 54 | |
| 55 | static unsigned short normal_i2c[] = { 0x0d, I2C_CLIENT_END }; |
| 56 | |
| 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 | } |
| 66 | |
| 67 | /* ===== API functions - these are called by a variety of users ==== */ |
| 68 | |
| 69 | static int dcon_hw_init(struct dcon_priv *dcon, int is_init) |
| 70 | { |
| 71 | struct i2c_client *client = dcon->client; |
| 72 | uint16_t ver; |
| 73 | int rc = 0; |
| 74 | |
| 75 | ver = i2c_smbus_read_word_data(client, DCON_REG_ID); |
| 76 | if ((ver >> 8) != 0xDC) { |
| 77 | printk(KERN_ERR "olpc-dcon: DCON ID not 0xDCxx: 0x%04x " |
| 78 | "instead.\n", ver); |
| 79 | rc = -ENXIO; |
| 80 | goto err; |
| 81 | } |
| 82 | |
| 83 | if (is_init) { |
| 84 | printk(KERN_INFO "olpc-dcon: Discovered DCON version %x\n", |
| 85 | ver & 0xFF); |
| 86 | rc = pdata->init(dcon); |
| 87 | if (rc != 0) { |
| 88 | printk(KERN_ERR "olpc-dcon: Unable to init.\n"); |
| 89 | goto err; |
| 90 | } |
| 91 | } |
| 92 | |
| 93 | if (ver < 0xdc02 && !noinit) { |
| 94 | /* Initialize the DCON registers */ |
| 95 | |
| 96 | /* Start with work-arounds for DCON ASIC */ |
| 97 | i2c_smbus_write_word_data(client, 0x4b, 0x00cc); |
| 98 | i2c_smbus_write_word_data(client, 0x4b, 0x00cc); |
| 99 | i2c_smbus_write_word_data(client, 0x4b, 0x00cc); |
| 100 | i2c_smbus_write_word_data(client, 0x0b, 0x007a); |
| 101 | i2c_smbus_write_word_data(client, 0x36, 0x025c); |
| 102 | i2c_smbus_write_word_data(client, 0x37, 0x025e); |
| 103 | |
| 104 | /* Initialise SDRAM */ |
| 105 | |
| 106 | i2c_smbus_write_word_data(client, 0x3b, 0x002b); |
| 107 | i2c_smbus_write_word_data(client, 0x41, 0x0101); |
| 108 | i2c_smbus_write_word_data(client, 0x42, 0x0101); |
| 109 | } else if (!noinit) { |
| 110 | /* SDRAM setup/hold time */ |
| 111 | i2c_smbus_write_word_data(client, 0x3a, 0xc040); |
| 112 | i2c_smbus_write_word_data(client, 0x41, 0x0000); |
| 113 | i2c_smbus_write_word_data(client, 0x41, 0x0101); |
| 114 | i2c_smbus_write_word_data(client, 0x42, 0x0101); |
| 115 | } |
| 116 | |
| 117 | /* Colour swizzle, AA, no passthrough, backlight */ |
| 118 | if (is_init) { |
| 119 | dcon->disp_mode = MODE_PASSTHRU | MODE_BL_ENABLE | |
| 120 | MODE_CSWIZZLE; |
| 121 | if (useaa) |
| 122 | dcon->disp_mode |= MODE_COL_AA; |
| 123 | } |
| 124 | i2c_smbus_write_word_data(client, DCON_REG_MODE, dcon->disp_mode); |
| 125 | |
| 126 | |
| 127 | /* Set the scanline to interrupt on during resume */ |
| 128 | i2c_smbus_write_word_data(client, DCON_REG_SCAN_INT, resumeline); |
| 129 | |
| 130 | err: |
| 131 | return rc; |
| 132 | } |
| 133 | |
| 134 | /* |
| 135 | * The smbus doesn't always come back due to what is believed to be |
| 136 | * hardware (power rail) bugs. For older models where this is known to |
| 137 | * occur, our solution is to attempt to wait for the bus to stabilize; |
| 138 | * if it doesn't happen, cut power to the dcon, repower it, and wait |
| 139 | * for the bus to stabilize. Rinse, repeat until we have a working |
| 140 | * smbus. For newer models, we simply BUG(); we want to know if this |
| 141 | * still happens despite the power fixes that have been made! |
| 142 | */ |
| 143 | static int dcon_bus_stabilize(struct dcon_priv *dcon, int is_powered_down) |
| 144 | { |
| 145 | unsigned long timeout; |
| 146 | int x; |
| 147 | |
| 148 | power_up: |
| 149 | if (is_powered_down) { |
| 150 | x = 1; |
| 151 | x = olpc_ec_cmd(0x26, (unsigned char *) &x, 1, NULL, 0); |
| 152 | if (x) { |
| 153 | printk(KERN_WARNING "olpc-dcon: unable to force dcon " |
| 154 | "to power up: %d!\n", x); |
| 155 | return x; |
| 156 | } |
| 157 | msleep(10); /* we'll be conservative */ |
| 158 | } |
| 159 | |
| 160 | pdata->bus_stabilize_wiggle(); |
| 161 | |
| 162 | for (x = -1, timeout = 50; timeout && x < 0; timeout--) { |
| 163 | msleep(1); |
| 164 | x = dcon_read(dcon, DCON_REG_ID); |
| 165 | } |
| 166 | if (x < 0) { |
| 167 | printk(KERN_ERR "olpc-dcon: unable to stabilize dcon's " |
| 168 | "smbus, reasserting power and praying.\n"); |
| 169 | BUG_ON(olpc_board_at_least(olpc_board(0xc2))); |
| 170 | x = 0; |
| 171 | olpc_ec_cmd(0x26, (unsigned char *) &x, 1, NULL, 0); |
| 172 | msleep(100); |
| 173 | is_powered_down = 1; |
| 174 | goto power_up; /* argh, stupid hardware.. */ |
| 175 | } |
| 176 | |
| 177 | if (is_powered_down) |
| 178 | return dcon_hw_init(dcon, 0); |
| 179 | return 0; |
| 180 | } |
| 181 | |
| 182 | static void dcon_set_backlight(struct dcon_priv *dcon, u8 level) |
| 183 | { |
| 184 | dcon->bl_val = level; |
| 185 | dcon_write(dcon, DCON_REG_BRIGHT, dcon->bl_val); |
| 186 | |
| 187 | /* Purposely turn off the backlight when we go to level 0 */ |
| 188 | if (dcon->bl_val == 0) { |
| 189 | dcon->disp_mode &= ~MODE_BL_ENABLE; |
| 190 | dcon_write(dcon, DCON_REG_MODE, dcon->disp_mode); |
| 191 | } else if (!(dcon->disp_mode & MODE_BL_ENABLE)) { |
| 192 | dcon->disp_mode |= MODE_BL_ENABLE; |
| 193 | dcon_write(dcon, DCON_REG_MODE, dcon->disp_mode); |
| 194 | } |
| 195 | } |
| 196 | |
| 197 | /* Set the output type to either color or mono */ |
| 198 | static int dcon_set_mono_mode(struct dcon_priv *dcon, bool enable_mono) |
| 199 | { |
| 200 | if (dcon->mono == enable_mono) |
| 201 | return 0; |
| 202 | |
| 203 | dcon->mono = enable_mono; |
| 204 | |
| 205 | if (enable_mono) { |
| 206 | dcon->disp_mode &= ~(MODE_CSWIZZLE | MODE_COL_AA); |
| 207 | dcon->disp_mode |= MODE_MONO_LUMA; |
| 208 | } else { |
| 209 | dcon->disp_mode &= ~(MODE_MONO_LUMA); |
| 210 | dcon->disp_mode |= MODE_CSWIZZLE; |
| 211 | if (useaa) |
| 212 | dcon->disp_mode |= MODE_COL_AA; |
| 213 | } |
| 214 | |
| 215 | dcon_write(dcon, DCON_REG_MODE, dcon->disp_mode); |
| 216 | return 0; |
| 217 | } |
| 218 | |
| 219 | /* For now, this will be really stupid - we need to address how |
| 220 | * DCONLOAD works in a sleep and account for it accordingly |
| 221 | */ |
| 222 | |
| 223 | static void dcon_sleep(struct dcon_priv *dcon, bool sleep) |
| 224 | { |
| 225 | int x; |
| 226 | |
| 227 | /* Turn off the backlight and put the DCON to sleep */ |
| 228 | |
| 229 | if (dcon->asleep == sleep) |
| 230 | return; |
| 231 | |
| 232 | if (!olpc_board_at_least(olpc_board(0xc2))) |
| 233 | return; |
| 234 | |
| 235 | if (sleep) { |
| 236 | x = 0; |
| 237 | x = olpc_ec_cmd(0x26, (unsigned char *) &x, 1, NULL, 0); |
| 238 | if (x) |
| 239 | printk(KERN_WARNING "olpc-dcon: unable to force dcon " |
| 240 | "to power down: %d!\n", x); |
| 241 | else |
| 242 | dcon->asleep = sleep; |
| 243 | } else { |
| 244 | /* Only re-enable the backlight if the backlight value is set */ |
| 245 | if (dcon->bl_val != 0) |
| 246 | dcon->disp_mode |= MODE_BL_ENABLE; |
| 247 | x = dcon_bus_stabilize(dcon, 1); |
| 248 | if (x) |
| 249 | printk(KERN_WARNING "olpc-dcon: unable to reinit dcon" |
| 250 | " hardware: %d!\n", x); |
| 251 | else |
| 252 | dcon->asleep = sleep; |
| 253 | |
| 254 | /* Restore backlight */ |
| 255 | dcon_set_backlight(dcon, dcon->bl_val); |
| 256 | } |
| 257 | |
| 258 | /* We should turn off some stuff in the framebuffer - but what? */ |
| 259 | } |
| 260 | |
| 261 | /* the DCON seems to get confused if we change DCONLOAD too |
| 262 | * frequently -- i.e., approximately faster than frame time. |
| 263 | * normally we don't change it this fast, so in general we won't |
| 264 | * delay here. |
| 265 | */ |
| 266 | static void dcon_load_holdoff(struct dcon_priv *dcon) |
| 267 | { |
| 268 | struct timespec delta_t, now; |
| 269 | while (1) { |
| 270 | getnstimeofday(&now); |
| 271 | delta_t = timespec_sub(now, dcon->load_time); |
| 272 | if (delta_t.tv_sec != 0 || |
| 273 | delta_t.tv_nsec > NSEC_PER_MSEC * 20) { |
| 274 | break; |
| 275 | } |
| 276 | mdelay(4); |
| 277 | } |
| 278 | } |
| 279 | |
| 280 | static bool dcon_blank_fb(struct dcon_priv *dcon, bool blank) |
| 281 | { |
| 282 | int err; |
| 283 | |
| 284 | if (!lock_fb_info(dcon->fbinfo)) { |
| 285 | dev_err(&dcon->client->dev, "unable to lock framebuffer\n"); |
| 286 | return false; |
| 287 | } |
| 288 | console_lock(); |
| 289 | dcon->ignore_fb_events = true; |
| 290 | err = fb_blank(dcon->fbinfo, |
| 291 | blank ? FB_BLANK_POWERDOWN : FB_BLANK_UNBLANK); |
| 292 | dcon->ignore_fb_events = false; |
| 293 | console_unlock(); |
| 294 | unlock_fb_info(dcon->fbinfo); |
| 295 | |
| 296 | if (err) { |
| 297 | dev_err(&dcon->client->dev, "couldn't %sblank framebuffer\n", |
| 298 | blank ? "" : "un"); |
| 299 | return false; |
| 300 | } |
| 301 | return true; |
| 302 | } |
| 303 | |
| 304 | /* Set the source of the display (CPU or DCON) */ |
| 305 | static void dcon_source_switch(struct work_struct *work) |
| 306 | { |
| 307 | struct dcon_priv *dcon = container_of(work, struct dcon_priv, |
| 308 | switch_source); |
| 309 | DECLARE_WAITQUEUE(wait, current); |
| 310 | int source = dcon->pending_src; |
| 311 | |
| 312 | if (dcon->curr_src == source) |
| 313 | return; |
| 314 | |
| 315 | dcon_load_holdoff(dcon); |
| 316 | |
| 317 | dcon->switched = false; |
| 318 | |
| 319 | switch (source) { |
| 320 | case DCON_SOURCE_CPU: |
| 321 | printk("dcon_source_switch to CPU\n"); |
| 322 | /* Enable the scanline interrupt bit */ |
| 323 | if (dcon_write(dcon, DCON_REG_MODE, |
| 324 | dcon->disp_mode | MODE_SCAN_INT)) |
| 325 | printk(KERN_ERR |
| 326 | "olpc-dcon: couldn't enable scanline interrupt!\n"); |
| 327 | else { |
| 328 | /* Wait up to one second for the scanline interrupt */ |
| 329 | wait_event_timeout(dcon_wait_queue, |
| 330 | dcon->switched == true, HZ); |
| 331 | } |
| 332 | |
| 333 | if (!dcon->switched) |
| 334 | printk(KERN_ERR "olpc-dcon: Timeout entering CPU mode; expect a screen glitch.\n"); |
| 335 | |
| 336 | /* Turn off the scanline interrupt */ |
| 337 | if (dcon_write(dcon, DCON_REG_MODE, dcon->disp_mode)) |
| 338 | printk(KERN_ERR "olpc-dcon: couldn't disable scanline interrupt!\n"); |
| 339 | |
| 340 | /* |
| 341 | * Ideally we'd like to disable interrupts here so that the |
| 342 | * fb unblanking and DCON turn on happen at a known time value; |
| 343 | * however, we can't do that right now with fb_blank |
| 344 | * messing with semaphores. |
| 345 | * |
| 346 | * For now, we just hope.. |
| 347 | */ |
| 348 | if (!dcon_blank_fb(dcon, false)) { |
| 349 | printk(KERN_ERR "olpc-dcon: Failed to enter CPU mode\n"); |
| 350 | dcon->pending_src = DCON_SOURCE_DCON; |
| 351 | return; |
| 352 | } |
| 353 | |
| 354 | /* And turn off the DCON */ |
| 355 | pdata->set_dconload(1); |
| 356 | getnstimeofday(&dcon->load_time); |
| 357 | |
| 358 | printk(KERN_INFO "olpc-dcon: The CPU has control\n"); |
| 359 | break; |
| 360 | case DCON_SOURCE_DCON: |
| 361 | { |
| 362 | int t; |
| 363 | struct timespec delta_t; |
| 364 | |
| 365 | printk(KERN_INFO "dcon_source_switch to DCON\n"); |
| 366 | |
| 367 | add_wait_queue(&dcon_wait_queue, &wait); |
| 368 | set_current_state(TASK_UNINTERRUPTIBLE); |
| 369 | |
| 370 | /* Clear DCONLOAD - this implies that the DCON is in control */ |
| 371 | pdata->set_dconload(0); |
| 372 | getnstimeofday(&dcon->load_time); |
| 373 | |
| 374 | t = schedule_timeout(HZ/2); |
| 375 | remove_wait_queue(&dcon_wait_queue, &wait); |
| 376 | set_current_state(TASK_RUNNING); |
| 377 | |
| 378 | if (!dcon->switched) { |
| 379 | printk(KERN_ERR "olpc-dcon: Timeout entering DCON mode; expect a screen glitch.\n"); |
| 380 | } else { |
| 381 | /* sometimes the DCON doesn't follow its own rules, |
| 382 | * and doesn't wait for two vsync pulses before |
| 383 | * ack'ing the frame load with an IRQ. the result |
| 384 | * is that the display shows the *previously* |
| 385 | * loaded frame. we can detect this by looking at |
| 386 | * the time between asserting DCONLOAD and the IRQ -- |
| 387 | * if it's less than 20msec, then the DCON couldn't |
| 388 | * have seen two VSYNC pulses. in that case we |
| 389 | * deassert and reassert, and hope for the best. |
| 390 | * see http://dev.laptop.org/ticket/9664 |
| 391 | */ |
| 392 | delta_t = timespec_sub(dcon->irq_time, dcon->load_time); |
| 393 | if (dcon->switched && delta_t.tv_sec == 0 && |
| 394 | delta_t.tv_nsec < NSEC_PER_MSEC * 20) { |
| 395 | printk(KERN_ERR "olpc-dcon: missed loading, retrying\n"); |
| 396 | pdata->set_dconload(1); |
| 397 | mdelay(41); |
| 398 | pdata->set_dconload(0); |
| 399 | getnstimeofday(&dcon->load_time); |
| 400 | mdelay(41); |
| 401 | } |
| 402 | } |
| 403 | |
| 404 | dcon_blank_fb(dcon, true); |
| 405 | printk(KERN_INFO "olpc-dcon: The DCON has control\n"); |
| 406 | break; |
| 407 | } |
| 408 | default: |
| 409 | BUG(); |
| 410 | } |
| 411 | |
| 412 | dcon->curr_src = source; |
| 413 | } |
| 414 | |
| 415 | static void dcon_set_source(struct dcon_priv *dcon, int arg) |
| 416 | { |
| 417 | if (dcon->pending_src == arg) |
| 418 | return; |
| 419 | |
| 420 | dcon->pending_src = arg; |
| 421 | |
| 422 | if ((dcon->curr_src != arg) && !work_pending(&dcon->switch_source)) |
| 423 | schedule_work(&dcon->switch_source); |
| 424 | } |
| 425 | |
| 426 | static void dcon_set_source_sync(struct dcon_priv *dcon, int arg) |
| 427 | { |
| 428 | dcon_set_source(dcon, arg); |
| 429 | flush_scheduled_work(); |
| 430 | } |
| 431 | |
| 432 | static ssize_t dcon_mode_show(struct device *dev, |
| 433 | struct device_attribute *attr, char *buf) |
| 434 | { |
| 435 | struct dcon_priv *dcon = dev_get_drvdata(dev); |
| 436 | return sprintf(buf, "%4.4X\n", dcon->disp_mode); |
| 437 | } |
| 438 | |
| 439 | static ssize_t dcon_sleep_show(struct device *dev, |
| 440 | struct device_attribute *attr, char *buf) |
| 441 | { |
| 442 | |
| 443 | struct dcon_priv *dcon = dev_get_drvdata(dev); |
| 444 | return sprintf(buf, "%d\n", dcon->asleep); |
| 445 | } |
| 446 | |
| 447 | static ssize_t dcon_freeze_show(struct device *dev, |
| 448 | struct device_attribute *attr, char *buf) |
| 449 | { |
| 450 | struct dcon_priv *dcon = dev_get_drvdata(dev); |
| 451 | return sprintf(buf, "%d\n", dcon->curr_src == DCON_SOURCE_DCON ? 1 : 0); |
| 452 | } |
| 453 | |
| 454 | static ssize_t dcon_mono_show(struct device *dev, |
| 455 | struct device_attribute *attr, char *buf) |
| 456 | { |
| 457 | struct dcon_priv *dcon = dev_get_drvdata(dev); |
| 458 | return sprintf(buf, "%d\n", dcon->mono); |
| 459 | } |
| 460 | |
| 461 | static ssize_t dcon_resumeline_show(struct device *dev, |
| 462 | struct device_attribute *attr, char *buf) |
| 463 | { |
| 464 | return sprintf(buf, "%d\n", resumeline); |
| 465 | } |
| 466 | |
| 467 | static ssize_t dcon_mono_store(struct device *dev, |
| 468 | struct device_attribute *attr, const char *buf, size_t count) |
| 469 | { |
| 470 | unsigned long enable_mono; |
| 471 | int rc; |
| 472 | |
| 473 | rc = strict_strtoul(buf, 10, &enable_mono); |
| 474 | if (rc) |
| 475 | return rc; |
| 476 | |
| 477 | dcon_set_mono_mode(dev_get_drvdata(dev), enable_mono ? true : false); |
| 478 | |
| 479 | return count; |
| 480 | } |
| 481 | |
| 482 | static ssize_t dcon_freeze_store(struct device *dev, |
| 483 | struct device_attribute *attr, const char *buf, size_t count) |
| 484 | { |
| 485 | struct dcon_priv *dcon = dev_get_drvdata(dev); |
| 486 | unsigned long output; |
| 487 | int ret; |
| 488 | |
| 489 | ret = strict_strtoul(buf, 10, &output); |
| 490 | if (ret) |
| 491 | return ret; |
| 492 | |
| 493 | printk(KERN_INFO "dcon_freeze_store: %lu\n", output); |
| 494 | |
| 495 | switch (output) { |
| 496 | case 0: |
| 497 | dcon_set_source(dcon, DCON_SOURCE_CPU); |
| 498 | break; |
| 499 | case 1: |
| 500 | dcon_set_source_sync(dcon, DCON_SOURCE_DCON); |
| 501 | break; |
| 502 | case 2: /* normally unused */ |
| 503 | dcon_set_source(dcon, DCON_SOURCE_DCON); |
| 504 | break; |
| 505 | default: |
| 506 | return -EINVAL; |
| 507 | } |
| 508 | |
| 509 | return count; |
| 510 | } |
| 511 | |
| 512 | static ssize_t dcon_resumeline_store(struct device *dev, |
| 513 | struct device_attribute *attr, const char *buf, size_t count) |
| 514 | { |
| 515 | unsigned long rl; |
| 516 | int rc; |
| 517 | |
| 518 | rc = strict_strtoul(buf, 10, &rl); |
| 519 | if (rc) |
| 520 | return rc; |
| 521 | |
| 522 | resumeline = rl; |
| 523 | dcon_write(dev_get_drvdata(dev), DCON_REG_SCAN_INT, resumeline); |
| 524 | |
| 525 | return count; |
| 526 | } |
| 527 | |
| 528 | static ssize_t dcon_sleep_store(struct device *dev, |
| 529 | struct device_attribute *attr, const char *buf, size_t count) |
| 530 | { |
| 531 | unsigned long output; |
| 532 | int ret; |
| 533 | |
| 534 | ret = strict_strtoul(buf, 10, &output); |
| 535 | if (ret) |
| 536 | return ret; |
| 537 | |
| 538 | dcon_sleep(dev_get_drvdata(dev), output ? true : false); |
| 539 | return count; |
| 540 | } |
| 541 | |
| 542 | static struct device_attribute dcon_device_files[] = { |
| 543 | __ATTR(mode, 0444, dcon_mode_show, NULL), |
| 544 | __ATTR(sleep, 0644, dcon_sleep_show, dcon_sleep_store), |
| 545 | __ATTR(freeze, 0644, dcon_freeze_show, dcon_freeze_store), |
| 546 | __ATTR(monochrome, 0644, dcon_mono_show, dcon_mono_store), |
| 547 | __ATTR(resumeline, 0644, dcon_resumeline_show, dcon_resumeline_store), |
| 548 | }; |
| 549 | |
| 550 | static int dcon_bl_update(struct backlight_device *dev) |
| 551 | { |
| 552 | struct dcon_priv *dcon = bl_get_data(dev); |
| 553 | u8 level = dev->props.brightness & 0x0F; |
| 554 | |
| 555 | if (dev->props.power != FB_BLANK_UNBLANK) |
| 556 | level = 0; |
| 557 | |
| 558 | if (level != dcon->bl_val) |
| 559 | dcon_set_backlight(dcon, level); |
| 560 | |
| 561 | return 0; |
| 562 | } |
| 563 | |
| 564 | static int dcon_bl_get(struct backlight_device *dev) |
| 565 | { |
| 566 | struct dcon_priv *dcon = bl_get_data(dev); |
| 567 | return dcon->bl_val; |
| 568 | } |
| 569 | |
| 570 | static const struct backlight_ops dcon_bl_ops = { |
| 571 | .update_status = dcon_bl_update, |
| 572 | .get_brightness = dcon_bl_get, |
| 573 | }; |
| 574 | |
| 575 | static struct backlight_properties dcon_bl_props = { |
| 576 | .max_brightness = 15, |
| 577 | .type = BACKLIGHT_RAW, |
| 578 | .power = FB_BLANK_UNBLANK, |
| 579 | }; |
| 580 | |
| 581 | static int dcon_reboot_notify(struct notifier_block *nb, |
| 582 | unsigned long foo, void *bar) |
| 583 | { |
| 584 | struct dcon_priv *dcon = container_of(nb, struct dcon_priv, reboot_nb); |
| 585 | |
| 586 | if (!dcon || !dcon->client) |
| 587 | return 0; |
| 588 | |
| 589 | /* Turn off the DCON. Entirely. */ |
| 590 | dcon_write(dcon, DCON_REG_MODE, 0x39); |
| 591 | dcon_write(dcon, DCON_REG_MODE, 0x32); |
| 592 | return 0; |
| 593 | } |
| 594 | |
| 595 | static int unfreeze_on_panic(struct notifier_block *nb, |
| 596 | unsigned long e, void *p) |
| 597 | { |
| 598 | pdata->set_dconload(1); |
| 599 | return NOTIFY_DONE; |
| 600 | } |
| 601 | |
| 602 | static struct notifier_block dcon_panic_nb = { |
| 603 | .notifier_call = unfreeze_on_panic, |
| 604 | }; |
| 605 | |
| 606 | /* |
| 607 | * When the framebuffer sleeps due to external sources (e.g. user idle), power |
| 608 | * down the DCON as well. Power it back up when the fb comes back to life. |
| 609 | */ |
| 610 | static int dcon_fb_notifier(struct notifier_block *self, |
| 611 | unsigned long event, void *data) |
| 612 | { |
| 613 | struct fb_event *evdata = data; |
| 614 | struct dcon_priv *dcon = container_of(self, struct dcon_priv, |
| 615 | fbevent_nb); |
| 616 | int *blank = (int *) evdata->data; |
| 617 | if (((event != FB_EVENT_BLANK) && (event != FB_EVENT_CONBLANK)) || |
| 618 | dcon->ignore_fb_events) |
| 619 | return 0; |
| 620 | dcon_sleep(dcon, *blank ? true : false); |
| 621 | return 0; |
| 622 | } |
| 623 | |
| 624 | static int dcon_detect(struct i2c_client *client, struct i2c_board_info *info) |
| 625 | { |
| 626 | strlcpy(info->type, "olpc_dcon", I2C_NAME_SIZE); |
| 627 | |
| 628 | return 0; |
| 629 | } |
| 630 | |
| 631 | static int dcon_probe(struct i2c_client *client, const struct i2c_device_id *id) |
| 632 | { |
| 633 | struct dcon_priv *dcon; |
| 634 | int rc, i, j; |
| 635 | |
| 636 | if (!pdata) |
| 637 | return -ENXIO; |
| 638 | |
| 639 | dcon = kzalloc(sizeof(*dcon), GFP_KERNEL); |
| 640 | if (!dcon) |
| 641 | return -ENOMEM; |
| 642 | |
| 643 | dcon->client = client; |
| 644 | INIT_WORK(&dcon->switch_source, dcon_source_switch); |
| 645 | dcon->reboot_nb.notifier_call = dcon_reboot_notify; |
| 646 | dcon->reboot_nb.priority = -1; |
| 647 | dcon->fbevent_nb.notifier_call = dcon_fb_notifier; |
| 648 | |
| 649 | i2c_set_clientdata(client, dcon); |
| 650 | |
| 651 | if (num_registered_fb < 1) { |
| 652 | dev_err(&client->dev, "DCON driver requires a registered fb\n"); |
| 653 | rc = -EIO; |
| 654 | goto einit; |
| 655 | } |
| 656 | dcon->fbinfo = registered_fb[0]; |
| 657 | |
| 658 | rc = dcon_hw_init(dcon, 1); |
| 659 | if (rc) |
| 660 | goto einit; |
| 661 | |
| 662 | /* Add the DCON device */ |
| 663 | |
| 664 | dcon_device = platform_device_alloc("dcon", -1); |
| 665 | |
| 666 | if (dcon_device == NULL) { |
| 667 | printk(KERN_ERR "dcon: Unable to create the DCON device\n"); |
| 668 | rc = -ENOMEM; |
| 669 | goto eirq; |
| 670 | } |
| 671 | rc = platform_device_add(dcon_device); |
| 672 | platform_set_drvdata(dcon_device, dcon); |
| 673 | |
| 674 | if (rc) { |
| 675 | printk(KERN_ERR "dcon: Unable to add the DCON device\n"); |
| 676 | goto edev; |
| 677 | } |
| 678 | |
| 679 | for (i = 0; i < ARRAY_SIZE(dcon_device_files); i++) { |
| 680 | rc = device_create_file(&dcon_device->dev, |
| 681 | &dcon_device_files[i]); |
| 682 | if (rc) { |
| 683 | dev_err(&dcon_device->dev, "Cannot create sysfs file\n"); |
| 684 | goto ecreate; |
| 685 | } |
| 686 | } |
| 687 | |
| 688 | dcon->bl_val = dcon_read(dcon, DCON_REG_BRIGHT) & 0x0F; |
| 689 | |
| 690 | /* Add the backlight device for the DCON */ |
| 691 | dcon_bl_props.brightness = dcon->bl_val; |
| 692 | dcon->bl_dev = backlight_device_register("dcon-bl", &dcon_device->dev, |
| 693 | dcon, &dcon_bl_ops, &dcon_bl_props); |
| 694 | if (IS_ERR(dcon->bl_dev)) { |
| 695 | dev_err(&client->dev, "cannot register backlight dev (%ld)\n", |
| 696 | PTR_ERR(dcon->bl_dev)); |
| 697 | dcon->bl_dev = NULL; |
| 698 | } |
| 699 | |
| 700 | register_reboot_notifier(&dcon->reboot_nb); |
| 701 | atomic_notifier_chain_register(&panic_notifier_list, &dcon_panic_nb); |
| 702 | fb_register_client(&dcon->fbevent_nb); |
| 703 | |
| 704 | return 0; |
| 705 | |
| 706 | ecreate: |
| 707 | for (j = 0; j < i; j++) |
| 708 | device_remove_file(&dcon_device->dev, &dcon_device_files[j]); |
| 709 | edev: |
| 710 | platform_device_unregister(dcon_device); |
| 711 | dcon_device = NULL; |
| 712 | eirq: |
| 713 | free_irq(DCON_IRQ, dcon); |
| 714 | einit: |
| 715 | i2c_set_clientdata(client, NULL); |
| 716 | kfree(dcon); |
| 717 | return rc; |
| 718 | } |
| 719 | |
| 720 | static int dcon_remove(struct i2c_client *client) |
| 721 | { |
| 722 | struct dcon_priv *dcon = i2c_get_clientdata(client); |
| 723 | |
| 724 | i2c_set_clientdata(client, NULL); |
| 725 | |
| 726 | fb_unregister_client(&dcon->fbevent_nb); |
| 727 | unregister_reboot_notifier(&dcon->reboot_nb); |
| 728 | atomic_notifier_chain_unregister(&panic_notifier_list, &dcon_panic_nb); |
| 729 | |
| 730 | free_irq(DCON_IRQ, dcon); |
| 731 | |
| 732 | if (dcon->bl_dev) |
| 733 | backlight_device_unregister(dcon->bl_dev); |
| 734 | |
| 735 | if (dcon_device != NULL) |
| 736 | platform_device_unregister(dcon_device); |
| 737 | cancel_work_sync(&dcon->switch_source); |
| 738 | |
| 739 | kfree(dcon); |
| 740 | |
| 741 | return 0; |
| 742 | } |
| 743 | |
| 744 | #ifdef CONFIG_PM |
| 745 | static int dcon_suspend(struct i2c_client *client, pm_message_t state) |
| 746 | { |
| 747 | struct dcon_priv *dcon = i2c_get_clientdata(client); |
| 748 | |
| 749 | if (!dcon->asleep) { |
| 750 | /* Set up the DCON to have the source */ |
| 751 | dcon_set_source_sync(dcon, DCON_SOURCE_DCON); |
| 752 | } |
| 753 | |
| 754 | return 0; |
| 755 | } |
| 756 | |
| 757 | static int dcon_resume(struct i2c_client *client) |
| 758 | { |
| 759 | struct dcon_priv *dcon = i2c_get_clientdata(client); |
| 760 | |
| 761 | if (!dcon->asleep) { |
| 762 | dcon_bus_stabilize(dcon, 0); |
| 763 | dcon_set_source(dcon, DCON_SOURCE_CPU); |
| 764 | } |
| 765 | |
| 766 | return 0; |
| 767 | } |
| 768 | |
| 769 | #endif |
| 770 | |
| 771 | |
| 772 | irqreturn_t dcon_interrupt(int irq, void *id) |
| 773 | { |
| 774 | struct dcon_priv *dcon = id; |
| 775 | int status = pdata->read_status(); |
| 776 | |
| 777 | if (status == -1) |
| 778 | return IRQ_NONE; |
| 779 | |
| 780 | switch (status & 3) { |
| 781 | case 3: |
| 782 | printk(KERN_DEBUG "olpc-dcon: DCONLOAD_MISSED interrupt\n"); |
| 783 | break; |
| 784 | |
| 785 | case 2: /* switch to DCON mode */ |
| 786 | case 1: /* switch to CPU mode */ |
| 787 | dcon->switched = true; |
| 788 | getnstimeofday(&dcon->irq_time); |
| 789 | wake_up(&dcon_wait_queue); |
| 790 | break; |
| 791 | |
| 792 | case 0: |
| 793 | /* workaround resume case: the DCON (on 1.5) doesn't |
| 794 | * ever assert status 0x01 when switching to CPU mode |
| 795 | * during resume. this is because DCONLOAD is de-asserted |
| 796 | * _immediately_ upon exiting S3, so the actual release |
| 797 | * of the DCON happened long before this point. |
| 798 | * see http://dev.laptop.org/ticket/9869 |
| 799 | */ |
| 800 | if (dcon->curr_src != dcon->pending_src && !dcon->switched) { |
| 801 | dcon->switched = true; |
| 802 | getnstimeofday(&dcon->irq_time); |
| 803 | wake_up(&dcon_wait_queue); |
| 804 | printk(KERN_DEBUG "olpc-dcon: switching w/ status 0/0\n"); |
| 805 | } else { |
| 806 | printk(KERN_DEBUG "olpc-dcon: scanline interrupt w/CPU\n"); |
| 807 | } |
| 808 | } |
| 809 | |
| 810 | return IRQ_HANDLED; |
| 811 | } |
| 812 | |
| 813 | static const struct i2c_device_id dcon_idtable[] = { |
| 814 | { "olpc_dcon", 0 }, |
| 815 | { } |
| 816 | }; |
| 817 | |
| 818 | MODULE_DEVICE_TABLE(i2c, dcon_idtable); |
| 819 | |
| 820 | struct i2c_driver dcon_driver = { |
| 821 | .driver = { |
| 822 | .name = "olpc_dcon", |
| 823 | }, |
| 824 | .class = I2C_CLASS_DDC | I2C_CLASS_HWMON, |
| 825 | .id_table = dcon_idtable, |
| 826 | .probe = dcon_probe, |
| 827 | .remove = __devexit_p(dcon_remove), |
| 828 | .detect = dcon_detect, |
| 829 | .address_list = normal_i2c, |
| 830 | #ifdef CONFIG_PM |
| 831 | .suspend = dcon_suspend, |
| 832 | .resume = dcon_resume, |
| 833 | #endif |
| 834 | }; |
| 835 | |
| 836 | static int __init olpc_dcon_init(void) |
| 837 | { |
| 838 | #ifdef CONFIG_FB_OLPC_DCON_1_5 |
| 839 | /* XO-1.5 */ |
| 840 | if (olpc_board_at_least(olpc_board(0xd0))) |
| 841 | pdata = &dcon_pdata_xo_1_5; |
| 842 | #endif |
| 843 | #ifdef CONFIG_FB_OLPC_DCON_1 |
| 844 | if (!pdata) |
| 845 | pdata = &dcon_pdata_xo_1; |
| 846 | #endif |
| 847 | |
| 848 | return i2c_add_driver(&dcon_driver); |
| 849 | } |
| 850 | |
| 851 | static void __exit olpc_dcon_exit(void) |
| 852 | { |
| 853 | i2c_del_driver(&dcon_driver); |
| 854 | } |
| 855 | |
| 856 | module_init(olpc_dcon_init); |
| 857 | module_exit(olpc_dcon_exit); |
| 858 | |
| 859 | MODULE_LICENSE("GPL"); |