Andres Salomon | eecb3e4 | 2010-09-24 19:13:42 -0700 | [diff] [blame] | 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> |
| 20 | #include <linux/i2c-id.h> |
| 21 | #include <linux/pci.h> |
Andres Salomon | eecb3e4 | 2010-09-24 19:13:42 -0700 | [diff] [blame] | 22 | #include <linux/pci_ids.h> |
| 23 | #include <linux/interrupt.h> |
| 24 | #include <linux/delay.h> |
| 25 | #include <linux/backlight.h> |
| 26 | #include <linux/device.h> |
| 27 | #include <linux/notifier.h> |
| 28 | #include <asm/uaccess.h> |
| 29 | #include <linux/ctype.h> |
| 30 | #include <linux/reboot.h> |
| 31 | #include <linux/gpio.h> |
| 32 | #include <asm/tsc.h> |
| 33 | #include <asm/olpc.h> |
| 34 | |
| 35 | #include "olpc_dcon.h" |
| 36 | |
| 37 | /* Module definitions */ |
| 38 | |
| 39 | static int resumeline = 898; |
| 40 | module_param(resumeline, int, 0444); |
| 41 | |
| 42 | static int noinit; |
| 43 | module_param(noinit, int, 0444); |
| 44 | |
| 45 | /* Default off since it doesn't work on DCON ASIC in B-test OLPC board */ |
| 46 | static int useaa = 1; |
| 47 | module_param(useaa, int, 0444); |
| 48 | |
| 49 | struct dcon_platform_data { |
| 50 | int (*init)(void); |
| 51 | void (*bus_stabilize_wiggle)(void); |
| 52 | void (*set_dconload)(int); |
| 53 | int (*read_status)(void); |
| 54 | }; |
| 55 | |
| 56 | static struct dcon_platform_data *pdata; |
| 57 | |
| 58 | /* I2C structures */ |
| 59 | |
| 60 | static struct i2c_driver dcon_driver; |
| 61 | static struct i2c_client *dcon_client; |
| 62 | |
| 63 | /* Platform devices */ |
| 64 | static struct platform_device *dcon_device; |
| 65 | |
| 66 | /* Backlight device */ |
| 67 | static struct backlight_device *dcon_bl_dev; |
| 68 | |
| 69 | static struct fb_info *fbinfo; |
| 70 | |
| 71 | /* set this to 1 while controlling fb blank state from this driver */ |
| 72 | static int ignore_fb_events = 0; |
| 73 | |
| 74 | /* Current source, initialized at probe time */ |
| 75 | static int dcon_source; |
| 76 | |
| 77 | /* Desired source */ |
| 78 | static int dcon_pending; |
| 79 | |
| 80 | /* Current output type */ |
| 81 | static int dcon_output = DCON_OUTPUT_COLOR; |
| 82 | |
| 83 | /* Current sleep status (not yet implemented) */ |
| 84 | static int dcon_sleep_val = DCON_ACTIVE; |
| 85 | |
| 86 | /* Shadow register for the DCON_REG_MODE register */ |
| 87 | static unsigned short dcon_disp_mode; |
| 88 | |
| 89 | /* Variables used during switches */ |
| 90 | static int dcon_switched; |
| 91 | static struct timespec dcon_irq_time; |
| 92 | static struct timespec dcon_load_time; |
| 93 | |
| 94 | static DECLARE_WAIT_QUEUE_HEAD(dcon_wait_queue); |
| 95 | |
| 96 | static unsigned short normal_i2c[] = { 0x0d, I2C_CLIENT_END }; |
| 97 | |
| 98 | #define dcon_write(reg,val) i2c_smbus_write_word_data(dcon_client,reg,val) |
| 99 | #define dcon_read(reg) i2c_smbus_read_word_data(dcon_client,reg) |
| 100 | |
| 101 | /* The current backlight value - this saves us some smbus traffic */ |
| 102 | static int bl_val = -1; |
| 103 | |
| 104 | /* ===== API functions - these are called by a variety of users ==== */ |
| 105 | |
| 106 | static int dcon_hw_init(struct i2c_client *client, int is_init) |
| 107 | { |
| 108 | uint16_t ver; |
| 109 | int rc = 0; |
| 110 | |
| 111 | ver = i2c_smbus_read_word_data(client, DCON_REG_ID); |
| 112 | if ((ver >> 8) != 0xDC) { |
| 113 | printk(KERN_ERR "olpc-dcon: DCON ID not 0xDCxx: 0x%04x " |
| 114 | "instead.\n", ver); |
| 115 | rc = -ENXIO; |
| 116 | goto err; |
| 117 | } |
| 118 | |
| 119 | if (is_init) { |
| 120 | printk(KERN_INFO "olpc-dcon: Discovered DCON version %x\n", |
| 121 | ver & 0xFF); |
| 122 | if ((rc = pdata->init()) != 0) { |
| 123 | printk(KERN_ERR "olpc-dcon: Unable to init.\n"); |
| 124 | goto err; |
| 125 | } |
| 126 | } |
| 127 | |
| 128 | if (ver < 0xdc02 && !noinit) { |
| 129 | /* Initialize the DCON registers */ |
| 130 | |
| 131 | /* Start with work-arounds for DCON ASIC */ |
| 132 | i2c_smbus_write_word_data(client, 0x4b, 0x00cc); |
| 133 | i2c_smbus_write_word_data(client, 0x4b, 0x00cc); |
| 134 | i2c_smbus_write_word_data(client, 0x4b, 0x00cc); |
| 135 | i2c_smbus_write_word_data(client, 0x0b, 0x007a); |
| 136 | i2c_smbus_write_word_data(client, 0x36, 0x025c); |
| 137 | i2c_smbus_write_word_data(client, 0x37, 0x025e); |
| 138 | |
| 139 | /* Initialise SDRAM */ |
| 140 | |
| 141 | i2c_smbus_write_word_data(client, 0x3b, 0x002b); |
| 142 | i2c_smbus_write_word_data(client, 0x41, 0x0101); |
| 143 | i2c_smbus_write_word_data(client, 0x42, 0x0101); |
| 144 | } |
| 145 | else if (!noinit) { |
| 146 | /* SDRAM setup/hold time */ |
| 147 | i2c_smbus_write_word_data(client, 0x3a, 0xc040); |
| 148 | i2c_smbus_write_word_data(client, 0x41, 0x0000); |
| 149 | i2c_smbus_write_word_data(client, 0x41, 0x0101); |
| 150 | i2c_smbus_write_word_data(client, 0x42, 0x0101); |
| 151 | } |
| 152 | |
| 153 | /* Colour swizzle, AA, no passthrough, backlight */ |
| 154 | if (is_init) { |
| 155 | dcon_disp_mode = MODE_PASSTHRU | MODE_BL_ENABLE | MODE_CSWIZZLE; |
| 156 | if (useaa) |
| 157 | dcon_disp_mode |= MODE_COL_AA; |
| 158 | } |
| 159 | i2c_smbus_write_word_data(client, DCON_REG_MODE, dcon_disp_mode); |
| 160 | |
| 161 | |
| 162 | /* Set the scanline to interrupt on during resume */ |
| 163 | i2c_smbus_write_word_data(client, DCON_REG_SCAN_INT, resumeline); |
| 164 | |
| 165 | err: |
| 166 | return rc; |
| 167 | } |
| 168 | |
| 169 | /* |
| 170 | * The smbus doesn't always come back due to what is believed to be |
| 171 | * hardware (power rail) bugs. For older models where this is known to |
| 172 | * occur, our solution is to attempt to wait for the bus to stabilize; |
| 173 | * if it doesn't happen, cut power to the dcon, repower it, and wait |
| 174 | * for the bus to stabilize. Rinse, repeat until we have a working |
| 175 | * smbus. For newer models, we simply BUG(); we want to know if this |
| 176 | * still happens despite the power fixes that have been made! |
| 177 | */ |
| 178 | static int dcon_bus_stabilize(struct i2c_client *client, int is_powered_down) |
| 179 | { |
| 180 | unsigned long timeout; |
| 181 | int x; |
| 182 | |
| 183 | power_up: |
| 184 | if (is_powered_down) { |
| 185 | x = 1; |
| 186 | if ((x = olpc_ec_cmd(0x26, (unsigned char *) &x, 1, NULL, 0))) { |
| 187 | printk(KERN_WARNING "olpc-dcon: unable to force dcon " |
| 188 | "to power up: %d!\n", x); |
| 189 | return x; |
| 190 | } |
| 191 | msleep(10); /* we'll be conservative */ |
| 192 | } |
| 193 | |
| 194 | pdata->bus_stabilize_wiggle(); |
| 195 | |
| 196 | for (x = -1, timeout = 50; timeout && x < 0; timeout--) { |
| 197 | msleep(1); |
| 198 | x = dcon_read(DCON_REG_ID); |
| 199 | } |
| 200 | if (x < 0) { |
| 201 | printk(KERN_ERR "olpc-dcon: unable to stabilize dcon's " |
| 202 | "smbus, reasserting power and praying.\n"); |
Andres Salomon | 316604b | 2010-09-24 19:14:09 -0700 | [diff] [blame] | 203 | BUG_ON(olpc_board_at_least(olpc_board(0xc2))); |
Andres Salomon | eecb3e4 | 2010-09-24 19:13:42 -0700 | [diff] [blame] | 204 | x = 0; |
| 205 | olpc_ec_cmd(0x26, (unsigned char *) &x, 1, NULL, 0); |
| 206 | msleep(100); |
| 207 | is_powered_down = 1; |
| 208 | goto power_up; /* argh, stupid hardware.. */ |
| 209 | } |
| 210 | |
| 211 | if (is_powered_down) |
| 212 | return dcon_hw_init(client, 0); |
| 213 | return 0; |
| 214 | } |
| 215 | |
Andres Salomon | eecb3e4 | 2010-09-24 19:13:42 -0700 | [diff] [blame] | 216 | static int dcon_get_backlight(void) |
| 217 | { |
| 218 | if (dcon_client == NULL) |
| 219 | return 0; |
| 220 | |
| 221 | if (bl_val == -1) |
| 222 | bl_val = dcon_read(DCON_REG_BRIGHT) & 0x0F; |
| 223 | |
| 224 | return bl_val; |
| 225 | } |
| 226 | |
| 227 | |
| 228 | static void dcon_set_backlight_hw(int level) |
| 229 | { |
| 230 | bl_val = level & 0x0F; |
| 231 | dcon_write(DCON_REG_BRIGHT, bl_val); |
| 232 | |
| 233 | /* Purposely turn off the backlight when we go to level 0 */ |
| 234 | if (bl_val == 0) { |
| 235 | dcon_disp_mode &= ~MODE_BL_ENABLE; |
| 236 | dcon_write(DCON_REG_MODE, dcon_disp_mode); |
| 237 | } else if (!(dcon_disp_mode & MODE_BL_ENABLE)) { |
| 238 | dcon_disp_mode |= MODE_BL_ENABLE; |
| 239 | dcon_write(DCON_REG_MODE, dcon_disp_mode); |
| 240 | } |
| 241 | } |
| 242 | |
| 243 | static void dcon_set_backlight(int level) |
| 244 | { |
| 245 | if (dcon_client == NULL) |
| 246 | return; |
| 247 | |
| 248 | if (bl_val == (level & 0x0F)) |
| 249 | return; |
| 250 | |
| 251 | dcon_set_backlight_hw(level); |
| 252 | } |
| 253 | |
| 254 | /* Set the output type to either color or mono */ |
| 255 | |
| 256 | static int dcon_set_output(int arg) |
| 257 | { |
| 258 | if (dcon_output == arg) |
| 259 | return 0; |
| 260 | |
| 261 | dcon_output = arg; |
| 262 | |
| 263 | if (arg == DCON_OUTPUT_MONO) { |
| 264 | dcon_disp_mode &= ~(MODE_CSWIZZLE | MODE_COL_AA); |
| 265 | dcon_disp_mode |= MODE_MONO_LUMA; |
| 266 | } |
| 267 | else { |
| 268 | dcon_disp_mode &= ~(MODE_MONO_LUMA); |
| 269 | dcon_disp_mode |= MODE_CSWIZZLE; |
| 270 | if (useaa) |
| 271 | dcon_disp_mode |= MODE_COL_AA; |
| 272 | } |
| 273 | |
| 274 | dcon_write(DCON_REG_MODE, dcon_disp_mode); |
| 275 | return 0; |
| 276 | } |
| 277 | |
| 278 | /* For now, this will be really stupid - we need to address how |
| 279 | * DCONLOAD works in a sleep and account for it accordingly |
| 280 | */ |
| 281 | |
| 282 | static void dcon_sleep(int state) |
| 283 | { |
| 284 | int x; |
| 285 | |
| 286 | /* Turn off the backlight and put the DCON to sleep */ |
| 287 | |
| 288 | if (state == dcon_sleep_val) |
| 289 | return; |
| 290 | |
Andres Salomon | 316604b | 2010-09-24 19:14:09 -0700 | [diff] [blame] | 291 | if (!olpc_board_at_least(olpc_board(0xc2))) |
Andres Salomon | eecb3e4 | 2010-09-24 19:13:42 -0700 | [diff] [blame] | 292 | return; |
| 293 | |
| 294 | if (state == DCON_SLEEP) { |
| 295 | x = 0; |
| 296 | if ((x = olpc_ec_cmd(0x26, (unsigned char *) &x, 1, NULL, 0))) |
| 297 | printk(KERN_WARNING "olpc-dcon: unable to force dcon " |
| 298 | "to power down: %d!\n", x); |
| 299 | else |
| 300 | dcon_sleep_val = state; |
| 301 | } |
| 302 | else { |
| 303 | /* Only re-enable the backlight if the backlight value is set */ |
| 304 | if (bl_val != 0) |
| 305 | dcon_disp_mode |= MODE_BL_ENABLE; |
| 306 | |
| 307 | if ((x=dcon_bus_stabilize(dcon_client, 1))) |
| 308 | printk(KERN_WARNING "olpc-dcon: unable to reinit dcon" |
| 309 | " hardware: %d!\n", x); |
| 310 | else |
| 311 | dcon_sleep_val = state; |
| 312 | |
| 313 | /* Restore backlight */ |
| 314 | dcon_set_backlight_hw(bl_val); |
| 315 | } |
| 316 | |
| 317 | /* We should turn off some stuff in the framebuffer - but what? */ |
| 318 | } |
| 319 | |
| 320 | /* the DCON seems to get confused if we change DCONLOAD too |
| 321 | * frequently -- i.e., approximately faster than frame time. |
| 322 | * normally we don't change it this fast, so in general we won't |
| 323 | * delay here. |
| 324 | */ |
| 325 | void dcon_load_holdoff(void) |
| 326 | { |
| 327 | struct timespec delta_t, now; |
| 328 | while(1) { |
| 329 | getnstimeofday(&now); |
| 330 | delta_t = timespec_sub(now, dcon_load_time); |
| 331 | if (delta_t.tv_sec != 0 || |
| 332 | delta_t.tv_nsec > NSEC_PER_MSEC * 20) { |
| 333 | break; |
| 334 | } |
| 335 | mdelay(4); |
| 336 | } |
| 337 | } |
| 338 | /* Set the source of the display (CPU or DCON) */ |
| 339 | |
| 340 | static void dcon_source_switch(struct work_struct *work) |
| 341 | { |
| 342 | DECLARE_WAITQUEUE(wait, current); |
| 343 | int source = dcon_pending; |
| 344 | |
| 345 | if (dcon_source == source) |
| 346 | return; |
| 347 | |
| 348 | dcon_load_holdoff(); |
| 349 | |
| 350 | dcon_switched = 0; |
| 351 | |
| 352 | switch (source) { |
| 353 | case DCON_SOURCE_CPU: |
| 354 | printk("dcon_source_switch to CPU\n"); |
| 355 | /* Enable the scanline interrupt bit */ |
| 356 | if (dcon_write(DCON_REG_MODE, dcon_disp_mode | MODE_SCAN_INT)) |
| 357 | printk(KERN_ERR "olpc-dcon: couldn't enable scanline interrupt!\n"); |
| 358 | else { |
| 359 | /* Wait up to one second for the scanline interrupt */ |
| 360 | wait_event_timeout(dcon_wait_queue, dcon_switched == 1, HZ); |
| 361 | } |
| 362 | |
| 363 | if (!dcon_switched) |
| 364 | printk(KERN_ERR "olpc-dcon: Timeout entering CPU mode; expect a screen glitch.\n"); |
| 365 | |
| 366 | /* Turn off the scanline interrupt */ |
| 367 | if (dcon_write(DCON_REG_MODE, dcon_disp_mode)) |
| 368 | printk(KERN_ERR "olpc-dcon: couldn't disable scanline interrupt!\n"); |
| 369 | |
| 370 | /* |
| 371 | * Ideally we'd like to disable interrupts here so that the |
| 372 | * fb unblanking and DCON turn on happen at a known time value; |
| 373 | * however, we can't do that right now with fb_blank |
| 374 | * messing with semaphores. |
| 375 | * |
| 376 | * For now, we just hope.. |
| 377 | */ |
| 378 | acquire_console_sem(); |
| 379 | ignore_fb_events = 1; |
| 380 | if (fb_blank(fbinfo, FB_BLANK_UNBLANK)) { |
| 381 | ignore_fb_events = 0; |
| 382 | release_console_sem(); |
| 383 | printk(KERN_ERR "olpc-dcon: Failed to enter CPU mode\n"); |
| 384 | dcon_pending = DCON_SOURCE_DCON; |
| 385 | return; |
| 386 | } |
| 387 | ignore_fb_events = 0; |
| 388 | release_console_sem(); |
| 389 | |
| 390 | /* And turn off the DCON */ |
| 391 | pdata->set_dconload(1); |
| 392 | getnstimeofday(&dcon_load_time); |
| 393 | |
| 394 | printk(KERN_INFO "olpc-dcon: The CPU has control\n"); |
| 395 | break; |
| 396 | case DCON_SOURCE_DCON: |
| 397 | { |
| 398 | int t; |
| 399 | struct timespec delta_t; |
| 400 | |
| 401 | printk("dcon_source_switch to DCON\n"); |
| 402 | |
| 403 | add_wait_queue(&dcon_wait_queue, &wait); |
| 404 | set_current_state(TASK_UNINTERRUPTIBLE); |
| 405 | |
| 406 | /* Clear DCONLOAD - this implies that the DCON is in control */ |
| 407 | pdata->set_dconload(0); |
| 408 | getnstimeofday(&dcon_load_time); |
| 409 | |
| 410 | t = schedule_timeout(HZ/2); |
| 411 | remove_wait_queue(&dcon_wait_queue, &wait); |
| 412 | set_current_state(TASK_RUNNING); |
| 413 | |
| 414 | if (!dcon_switched) { |
| 415 | printk(KERN_ERR "olpc-dcon: Timeout entering DCON mode; expect a screen glitch.\n"); |
| 416 | } else { |
| 417 | /* sometimes the DCON doesn't follow its own rules, |
| 418 | * and doesn't wait for two vsync pulses before |
| 419 | * ack'ing the frame load with an IRQ. the result |
| 420 | * is that the display shows the *previously* |
| 421 | * loaded frame. we can detect this by looking at |
| 422 | * the time between asserting DCONLOAD and the IRQ -- |
| 423 | * if it's less than 20msec, then the DCON couldn't |
| 424 | * have seen two VSYNC pulses. in that case we |
| 425 | * deassert and reassert, and hope for the best. |
| 426 | * see http://dev.laptop.org/ticket/9664 |
| 427 | */ |
| 428 | delta_t = timespec_sub(dcon_irq_time, dcon_load_time); |
| 429 | if (dcon_switched && delta_t.tv_sec == 0 && |
| 430 | delta_t.tv_nsec < NSEC_PER_MSEC * 20) { |
| 431 | printk(KERN_ERR "olpc-dcon: missed loading, retrying\n"); |
| 432 | pdata->set_dconload(1); |
| 433 | mdelay(41); |
| 434 | pdata->set_dconload(0); |
| 435 | getnstimeofday(&dcon_load_time); |
| 436 | mdelay(41); |
| 437 | } |
| 438 | } |
| 439 | |
| 440 | acquire_console_sem(); |
| 441 | ignore_fb_events = 1; |
| 442 | if (fb_blank(fbinfo, FB_BLANK_POWERDOWN)) |
| 443 | printk(KERN_ERR "olpc-dcon: couldn't blank fb!\n"); |
| 444 | ignore_fb_events = 0; |
| 445 | release_console_sem(); |
| 446 | |
| 447 | printk(KERN_INFO "olpc-dcon: The DCON has control\n"); |
| 448 | break; |
| 449 | } |
| 450 | default: |
| 451 | BUG(); |
| 452 | } |
| 453 | |
| 454 | dcon_source = source; |
| 455 | } |
| 456 | |
| 457 | static DECLARE_WORK(dcon_work, dcon_source_switch); |
| 458 | |
| 459 | static void dcon_set_source(int arg) |
| 460 | { |
| 461 | if (dcon_pending == arg) |
| 462 | return; |
| 463 | |
| 464 | dcon_pending = arg; |
| 465 | |
| 466 | if ((dcon_source != arg) && !work_pending(&dcon_work)) |
| 467 | schedule_work(&dcon_work); |
| 468 | } |
| 469 | |
| 470 | static void dcon_set_source_sync(int arg) |
| 471 | { |
| 472 | dcon_set_source(arg); |
| 473 | flush_scheduled_work(); |
| 474 | } |
| 475 | |
| 476 | static int dconbl_set(struct backlight_device *dev) { |
| 477 | |
| 478 | int level = dev->props.brightness; |
| 479 | |
| 480 | if (dev->props.power != FB_BLANK_UNBLANK) |
| 481 | level = 0; |
| 482 | |
| 483 | dcon_set_backlight(level); |
| 484 | return 0; |
| 485 | } |
| 486 | |
| 487 | static int dconbl_get(struct backlight_device *dev) { |
| 488 | return dcon_get_backlight(); |
| 489 | } |
| 490 | |
| 491 | static ssize_t dcon_mode_show(struct device *dev, |
| 492 | struct device_attribute *attr, char *buf) |
| 493 | { |
| 494 | return sprintf(buf, "%4.4X\n", dcon_disp_mode); |
| 495 | } |
| 496 | |
| 497 | static ssize_t dcon_sleep_show(struct device *dev, |
| 498 | struct device_attribute *attr, char *buf) |
| 499 | { |
| 500 | |
| 501 | return sprintf(buf, "%d\n", dcon_sleep_val); |
| 502 | } |
| 503 | |
| 504 | static ssize_t dcon_freeze_show(struct device *dev, |
| 505 | struct device_attribute *attr, char *buf) |
| 506 | { |
| 507 | return sprintf(buf, "%d\n", dcon_source == DCON_SOURCE_DCON ? 1 : 0); |
| 508 | } |
| 509 | |
| 510 | static ssize_t dcon_output_show(struct device *dev, |
| 511 | struct device_attribute *attr, char *buf) |
| 512 | { |
| 513 | return sprintf(buf, "%d\n", dcon_output); |
| 514 | } |
| 515 | |
| 516 | static ssize_t dcon_resumeline_show(struct device *dev, |
| 517 | struct device_attribute *attr, char *buf) |
| 518 | { |
| 519 | return sprintf(buf, "%d\n", resumeline); |
| 520 | } |
| 521 | |
| 522 | static int _strtoul(const char *buf, int len, unsigned int *val) |
| 523 | { |
| 524 | |
| 525 | char *endp; |
| 526 | unsigned int output = simple_strtoul(buf, &endp, 0); |
| 527 | int size = endp - buf; |
| 528 | |
| 529 | if (*endp && isspace(*endp)) |
| 530 | size++; |
| 531 | |
| 532 | if (size != len) |
| 533 | return -EINVAL; |
| 534 | |
| 535 | *val = output; |
| 536 | return 0; |
| 537 | } |
| 538 | |
| 539 | static ssize_t dcon_output_store(struct device *dev, |
| 540 | struct device_attribute *attr, const char *buf, size_t count) |
| 541 | { |
| 542 | int output; |
| 543 | int rc = -EINVAL; |
| 544 | |
| 545 | if (_strtoul(buf, count, &output)) |
| 546 | return -EINVAL; |
| 547 | |
| 548 | if (output == DCON_OUTPUT_COLOR || output == DCON_OUTPUT_MONO) { |
| 549 | dcon_set_output(output); |
| 550 | rc = count; |
| 551 | } |
| 552 | |
| 553 | return rc; |
| 554 | } |
| 555 | |
| 556 | static ssize_t dcon_freeze_store(struct device *dev, |
| 557 | struct device_attribute *attr, const char *buf, size_t count) |
| 558 | { |
| 559 | int output; |
| 560 | |
| 561 | if (_strtoul(buf, count, &output)) |
| 562 | return -EINVAL; |
| 563 | |
| 564 | printk("dcon_freeze_store: %d\n", output); |
| 565 | |
| 566 | switch (output) { |
| 567 | case 0: |
| 568 | dcon_set_source(DCON_SOURCE_CPU); |
| 569 | break; |
| 570 | case 1: |
| 571 | dcon_set_source_sync(DCON_SOURCE_DCON); |
| 572 | break; |
| 573 | case 2: // normally unused |
| 574 | dcon_set_source(DCON_SOURCE_DCON); |
| 575 | break; |
| 576 | default: |
| 577 | return -EINVAL; |
| 578 | } |
| 579 | |
| 580 | return count; |
| 581 | } |
| 582 | |
| 583 | static ssize_t dcon_resumeline_store(struct device *dev, |
| 584 | struct device_attribute *attr, const char *buf, size_t count) |
| 585 | { |
| 586 | int rl; |
| 587 | int rc = -EINVAL; |
| 588 | |
| 589 | if (_strtoul(buf, count, &rl)) |
| 590 | return rc; |
| 591 | |
| 592 | resumeline = rl; |
| 593 | dcon_write(DCON_REG_SCAN_INT, resumeline); |
| 594 | rc = count; |
| 595 | |
| 596 | return rc; |
| 597 | } |
| 598 | |
| 599 | static ssize_t dcon_sleep_store(struct device *dev, |
| 600 | struct device_attribute *attr, const char *buf, size_t count) |
| 601 | { |
| 602 | int output; |
| 603 | |
| 604 | if (_strtoul(buf, count, &output)) |
| 605 | return -EINVAL; |
| 606 | |
| 607 | dcon_sleep(output ? DCON_SLEEP : DCON_ACTIVE); |
| 608 | return count; |
| 609 | } |
| 610 | |
| 611 | static struct device_attribute dcon_device_files[] = { |
| 612 | __ATTR(mode, 0444, dcon_mode_show, NULL), |
| 613 | __ATTR(sleep, 0644, dcon_sleep_show, dcon_sleep_store), |
| 614 | __ATTR(freeze, 0644, dcon_freeze_show, dcon_freeze_store), |
| 615 | __ATTR(output, 0644, dcon_output_show, dcon_output_store), |
| 616 | __ATTR(resumeline, 0644, dcon_resumeline_show, dcon_resumeline_store), |
| 617 | }; |
| 618 | |
| 619 | static struct backlight_ops dcon_bl_ops = { |
| 620 | .get_brightness = dconbl_get, |
| 621 | .update_status = dconbl_set |
| 622 | }; |
| 623 | |
| 624 | |
| 625 | static int dcon_reboot_notify(struct notifier_block *nb, unsigned long foo, void *bar) |
| 626 | { |
| 627 | if (dcon_client == NULL) |
| 628 | return 0; |
| 629 | |
| 630 | /* Turn off the DCON. Entirely. */ |
| 631 | dcon_write(DCON_REG_MODE, 0x39); |
| 632 | dcon_write(DCON_REG_MODE, 0x32); |
| 633 | return 0; |
| 634 | } |
| 635 | |
Andres Salomon | eecb3e4 | 2010-09-24 19:13:42 -0700 | [diff] [blame] | 636 | static struct notifier_block dcon_nb = { |
| 637 | .notifier_call = dcon_reboot_notify, |
| 638 | .priority = -1, |
| 639 | }; |
| 640 | |
Andres Salomon | eecb3e4 | 2010-09-24 19:13:42 -0700 | [diff] [blame] | 641 | static int unfreeze_on_panic(struct notifier_block *nb, unsigned long e, void *p) |
| 642 | { |
| 643 | pdata->set_dconload(1); |
| 644 | return NOTIFY_DONE; |
| 645 | } |
| 646 | |
| 647 | static struct notifier_block dcon_panic_nb = { |
| 648 | .notifier_call = unfreeze_on_panic, |
| 649 | }; |
| 650 | |
Andres Salomon | 95699fb | 2010-09-25 19:06:30 -0700 | [diff] [blame^] | 651 | /* |
| 652 | * When the framebuffer sleeps due to external sources (e.g. user idle), power |
| 653 | * down the DCON as well. Power it back up when the fb comes back to life. |
| 654 | */ |
Andres Salomon | eecb3e4 | 2010-09-24 19:13:42 -0700 | [diff] [blame] | 655 | static int fb_notifier_callback(struct notifier_block *self, unsigned long event, void *data) |
| 656 | { |
| 657 | struct fb_event *evdata = data; |
| 658 | int *blank = (int *) evdata->data; |
Andres Salomon | 95699fb | 2010-09-25 19:06:30 -0700 | [diff] [blame^] | 659 | if (((event != FB_EVENT_BLANK) && (event != FB_EVENT_CONBLANK)) || |
| 660 | ignore_fb_events) |
Andres Salomon | eecb3e4 | 2010-09-24 19:13:42 -0700 | [diff] [blame] | 661 | return 0; |
| 662 | dcon_sleep((*blank) ? DCON_SLEEP : DCON_ACTIVE); |
| 663 | return 0; |
| 664 | } |
| 665 | |
| 666 | static struct notifier_block fb_nb = { |
| 667 | .notifier_call = fb_notifier_callback, |
| 668 | }; |
| 669 | |
| 670 | static int dcon_detect(struct i2c_client *client, struct i2c_board_info *info) |
| 671 | { |
| 672 | strlcpy(info->type, "olpc_dcon", I2C_NAME_SIZE); |
| 673 | |
| 674 | return 0; |
| 675 | } |
| 676 | |
| 677 | static int dcon_probe(struct i2c_client *client, const struct i2c_device_id *id) |
| 678 | { |
| 679 | int rc, i; |
| 680 | |
| 681 | if (num_registered_fb >= 1) |
| 682 | fbinfo = registered_fb[0]; |
| 683 | |
| 684 | rc = dcon_hw_init(client, 1); |
| 685 | if (rc) |
| 686 | goto einit; |
| 687 | |
| 688 | /* Add the DCON device */ |
| 689 | |
| 690 | dcon_device = platform_device_alloc("dcon", -1); |
| 691 | |
| 692 | if (dcon_device == NULL) { |
| 693 | printk("dcon: Unable to create the DCON device\n"); |
| 694 | rc = -ENOMEM; |
| 695 | goto eirq; |
| 696 | } |
| 697 | /* Place holder...*/ |
| 698 | i2c_set_clientdata(client, dcon_device); |
| 699 | |
| 700 | if ((rc = platform_device_add(dcon_device))) { |
| 701 | printk("dcon: Unable to add the DCON device\n"); |
| 702 | goto edev; |
| 703 | } |
| 704 | |
| 705 | for(i = 0; i < ARRAY_SIZE(dcon_device_files); i++) |
| 706 | device_create_file(&dcon_device->dev, &dcon_device_files[i]); |
| 707 | |
| 708 | /* Add the backlight device for the DCON */ |
| 709 | |
| 710 | dcon_client = client; |
| 711 | |
| 712 | dcon_bl_dev = backlight_device_register("dcon-bl", &dcon_device->dev, |
| 713 | NULL, &dcon_bl_ops, NULL); |
| 714 | |
| 715 | if (IS_ERR(dcon_bl_dev)) { |
| 716 | printk("Could not register the backlight device for the DCON (%ld)\n", PTR_ERR(dcon_bl_dev)); |
| 717 | dcon_bl_dev = NULL; |
| 718 | } |
| 719 | else { |
| 720 | dcon_bl_dev->props.max_brightness = 15; |
| 721 | dcon_bl_dev->props.power = FB_BLANK_UNBLANK; |
| 722 | dcon_bl_dev->props.brightness = dcon_get_backlight(); |
| 723 | |
| 724 | backlight_update_status(dcon_bl_dev); |
| 725 | } |
| 726 | |
| 727 | register_reboot_notifier(&dcon_nb); |
Andres Salomon | eecb3e4 | 2010-09-24 19:13:42 -0700 | [diff] [blame] | 728 | atomic_notifier_chain_register(&panic_notifier_list, &dcon_panic_nb); |
| 729 | fb_register_client(&fb_nb); |
| 730 | |
| 731 | return 0; |
| 732 | |
| 733 | edev: |
| 734 | platform_device_unregister(dcon_device); |
| 735 | dcon_device = NULL; |
| 736 | i2c_set_clientdata(client, NULL); |
| 737 | eirq: |
| 738 | free_irq(DCON_IRQ, &dcon_driver); |
| 739 | einit: |
| 740 | return rc; |
| 741 | } |
| 742 | |
| 743 | static int dcon_remove(struct i2c_client *client) |
| 744 | { |
| 745 | dcon_client = NULL; |
| 746 | |
| 747 | fb_unregister_client(&fb_nb); |
| 748 | unregister_reboot_notifier(&dcon_nb); |
Andres Salomon | eecb3e4 | 2010-09-24 19:13:42 -0700 | [diff] [blame] | 749 | atomic_notifier_chain_unregister(&panic_notifier_list, &dcon_panic_nb); |
| 750 | |
| 751 | free_irq(DCON_IRQ, &dcon_driver); |
| 752 | |
| 753 | if (dcon_bl_dev != NULL) |
| 754 | backlight_device_unregister(dcon_bl_dev); |
| 755 | |
| 756 | if (dcon_device != NULL) |
| 757 | platform_device_unregister(dcon_device); |
| 758 | cancel_work_sync(&dcon_work); |
| 759 | |
| 760 | i2c_set_clientdata(client, NULL); |
| 761 | |
| 762 | return 0; |
| 763 | } |
| 764 | |
| 765 | #ifdef CONFIG_PM |
| 766 | static int dcon_suspend(struct i2c_client *client, pm_message_t state) |
| 767 | { |
| 768 | if (dcon_sleep_val == DCON_ACTIVE) { |
| 769 | /* Set up the DCON to have the source */ |
| 770 | dcon_set_source_sync(DCON_SOURCE_DCON); |
| 771 | } |
| 772 | |
| 773 | return 0; |
| 774 | } |
| 775 | |
| 776 | static int dcon_resume(struct i2c_client *client) |
| 777 | { |
| 778 | if (dcon_sleep_val == DCON_ACTIVE) { |
| 779 | dcon_bus_stabilize(client, 0); |
| 780 | dcon_set_source(DCON_SOURCE_CPU); |
| 781 | } |
| 782 | |
| 783 | return 0; |
| 784 | } |
| 785 | |
| 786 | #endif |
| 787 | |
| 788 | |
| 789 | static irqreturn_t dcon_interrupt(int irq, void *id) |
| 790 | { |
| 791 | int status = pdata->read_status(); |
| 792 | |
| 793 | if (status == -1) |
| 794 | return IRQ_NONE; |
| 795 | |
| 796 | switch (status & 3) { |
| 797 | case 3: |
| 798 | printk(KERN_DEBUG "olpc-dcon: DCONLOAD_MISSED interrupt\n"); |
| 799 | break; |
| 800 | |
| 801 | case 2: /* switch to DCON mode */ |
| 802 | case 1: /* switch to CPU mode */ |
| 803 | dcon_switched = 1; |
| 804 | getnstimeofday(&dcon_irq_time); |
| 805 | wake_up(&dcon_wait_queue); |
| 806 | break; |
| 807 | |
| 808 | case 0: |
| 809 | /* workaround resume case: the DCON (on 1.5) doesn't |
| 810 | * ever assert status 0x01 when switching to CPU mode |
| 811 | * during resume. this is because DCONLOAD is de-asserted |
| 812 | * _immediately_ upon exiting S3, so the actual release |
| 813 | * of the DCON happened long before this point. |
| 814 | * see http://dev.laptop.org/ticket/9869 |
| 815 | */ |
| 816 | if (dcon_source != dcon_pending && !dcon_switched) { |
| 817 | dcon_switched = 1; |
| 818 | getnstimeofday(&dcon_irq_time); |
| 819 | wake_up(&dcon_wait_queue); |
| 820 | printk(KERN_DEBUG "olpc-dcon: switching w/ status 0/0\n"); |
| 821 | } else { |
| 822 | printk(KERN_DEBUG "olpc-dcon: scanline interrupt w/CPU\n"); |
| 823 | } |
| 824 | } |
| 825 | |
| 826 | return IRQ_HANDLED; |
| 827 | } |
| 828 | |
| 829 | static struct i2c_device_id dcon_idtable[] = { |
| 830 | { "olpc_dcon", 0 }, |
| 831 | { } |
| 832 | }; |
| 833 | |
| 834 | MODULE_DEVICE_TABLE(i2c, dcon_idtable); |
| 835 | |
| 836 | static struct i2c_driver dcon_driver = { |
| 837 | .driver = { |
| 838 | .name = "olpc_dcon", |
| 839 | }, |
| 840 | .class = I2C_CLASS_DDC | I2C_CLASS_HWMON, |
| 841 | .id_table = dcon_idtable, |
| 842 | .probe = dcon_probe, |
| 843 | .remove = __devexit_p(dcon_remove), |
| 844 | .detect = dcon_detect, |
| 845 | .address_list = normal_i2c, |
| 846 | #ifdef CONFIG_PM |
| 847 | .suspend = dcon_suspend, |
| 848 | .resume = dcon_resume, |
| 849 | #endif |
| 850 | }; |
| 851 | |
Andres Salomon | eecb3e4 | 2010-09-24 19:13:42 -0700 | [diff] [blame] | 852 | #include "olpc_dcon_xo_1.c" |
Andres Salomon | eecb3e4 | 2010-09-24 19:13:42 -0700 | [diff] [blame] | 853 | |
| 854 | static int __init olpc_dcon_init(void) |
| 855 | { |
Andres Salomon | eecb3e4 | 2010-09-24 19:13:42 -0700 | [diff] [blame] | 856 | pdata = &dcon_pdata_xo_1; |
Andres Salomon | eecb3e4 | 2010-09-24 19:13:42 -0700 | [diff] [blame] | 857 | |
| 858 | i2c_add_driver(&dcon_driver); |
| 859 | return 0; |
| 860 | } |
| 861 | |
| 862 | static void __exit olpc_dcon_exit(void) |
| 863 | { |
| 864 | i2c_del_driver(&dcon_driver); |
| 865 | } |
| 866 | |
| 867 | module_init(olpc_dcon_init); |
| 868 | module_exit(olpc_dcon_exit); |
| 869 | |
| 870 | MODULE_LICENSE("GPL"); |