Version:  2.6.32 2.6.33 2.6.34 2.6.35 2.6.36 2.6.37 2.6.38 2.6.39 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9

Architecture:  x86 arm avr32 blackfin m68k m68knommu microblaze mips powerpc sh

   /*
    * Mainly by David Woodhouse, somewhat modified by Jordan Crouse
    *
    * Copyright © 2006-2007  Red Hat, Inc.
    * Copyright © 2006-2007  Advanced Micro Devices, Inc.
    * Copyright © 2009       VIA Technology, Inc.
    * Copyright (c) 2010-2011  Andres Salomon <dilinger@queued.net>
    *
    * This program is free software.  You can redistribute it and/or
   * modify it under the terms of version 2 of the GNU General Public
   * License as published by the Free Software Foundation.
   */
  
  #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  
  #include <linux/kernel.h>
  #include <linux/fb.h>
  #include <linux/console.h>
  #include <linux/i2c.h>
  #include <linux/platform_device.h>
  #include <linux/pci.h>
  #include <linux/pci_ids.h>
  #include <linux/interrupt.h>
  #include <linux/delay.h>
  #include <linux/module.h>
  #include <linux/backlight.h>
  #include <linux/device.h>
  #include <linux/uaccess.h>
  #include <linux/ctype.h>
  #include <linux/reboot.h>
  #include <linux/olpc-ec.h>
  #include <asm/tsc.h>
  #include <asm/olpc.h>
  
  #include "olpc_dcon.h"
  
  /* Module definitions */
  
  static ushort resumeline = 898;
  module_param(resumeline, ushort, 0444);
  
  static struct dcon_platform_data *pdata;
  
  /* I2C structures */
  
  /* Platform devices */
  static struct platform_device *dcon_device;
  
  static unsigned short normal_i2c[] = { 0x0d, I2C_CLIENT_END };
  
  static s32 dcon_write(struct dcon_priv *dcon, u8 reg, u16 val)
  {
          return i2c_smbus_write_word_data(dcon->client, reg, val);
  }
  
  static s32 dcon_read(struct dcon_priv *dcon, u8 reg)
  {
          return i2c_smbus_read_word_data(dcon->client, reg);
  }
  
  /* ===== API functions - these are called by a variety of users ==== */
  
  static int dcon_hw_init(struct dcon_priv *dcon, int is_init)
  {
          uint16_t ver;
          int rc = 0;
  
          ver = dcon_read(dcon, DCON_REG_ID);
          if ((ver >> 8) != 0xDC) {
                  pr_err("DCON ID not 0xDCxx: 0x%04x instead.\n", ver);
                  rc = -ENXIO;
                  goto err;
          }
  
          if (is_init) {
                  pr_info("Discovered DCON version %x\n", ver & 0xFF);
                  rc = pdata->init(dcon);
                  if (rc != 0) {
                          pr_err("Unable to init.\n");
                          goto err;
                  }
          }
  
          if (ver < 0xdc02) {
                  dev_err(&dcon->client->dev,
                                  "DCON v1 is unsupported, giving up..\n");
                  rc = -ENODEV;
                  goto err;
          }
  
          /* SDRAM setup/hold time */
          dcon_write(dcon, 0x3a, 0xc040);
          dcon_write(dcon, 0x41, 0x0000);
          dcon_write(dcon, 0x41, 0x0101);
          dcon_write(dcon, 0x42, 0x0101);
  
          /* Colour swizzle, AA, no passthrough, backlight */
          if (is_init) {
                  dcon->disp_mode = MODE_PASSTHRU | MODE_BL_ENABLE |
                                 MODE_CSWIZZLE | MODE_COL_AA;
         }
         dcon_write(dcon, DCON_REG_MODE, dcon->disp_mode);
 
 
         /* Set the scanline to interrupt on during resume */
         dcon_write(dcon, DCON_REG_SCAN_INT, resumeline);
 
 err:
         return rc;
 }
 
 /*
  * The smbus doesn't always come back due to what is believed to be
  * hardware (power rail) bugs.  For older models where this is known to
  * occur, our solution is to attempt to wait for the bus to stabilize;
  * if it doesn't happen, cut power to the dcon, repower it, and wait
  * for the bus to stabilize.  Rinse, repeat until we have a working
  * smbus.  For newer models, we simply BUG(); we want to know if this
  * still happens despite the power fixes that have been made!
  */
 static int dcon_bus_stabilize(struct dcon_priv *dcon, int is_powered_down)
 {
         unsigned long timeout;
         int x;
 
 power_up:
         if (is_powered_down) {
                 x = 1;
                 x = olpc_ec_cmd(0x26, (unsigned char *)&x, 1, NULL, 0);
                 if (x) {
                         pr_warn("unable to force dcon to power up: %d!\n", x);
                         return x;
                 }
                 msleep(10); /* we'll be conservative */
         }
 
         pdata->bus_stabilize_wiggle();
 
         for (x = -1, timeout = 50; timeout && x < 0; timeout--) {
                 msleep(1);
                 x = dcon_read(dcon, DCON_REG_ID);
         }
         if (x < 0) {
                 pr_err("unable to stabilize dcon's smbus, reasserting power and praying.\n");
                 BUG_ON(olpc_board_at_least(olpc_board(0xc2)));
                 x = 0;
                 olpc_ec_cmd(0x26, (unsigned char *)&x, 1, NULL, 0);
                 msleep(100);
                 is_powered_down = 1;
                 goto power_up;  /* argh, stupid hardware.. */
         }
 
         if (is_powered_down)
                 return dcon_hw_init(dcon, 0);
         return 0;
 }
 
 static void dcon_set_backlight(struct dcon_priv *dcon, u8 level)
 {
         dcon->bl_val = level;
         dcon_write(dcon, DCON_REG_BRIGHT, dcon->bl_val);
 
         /* Purposely turn off the backlight when we go to level 0 */
         if (dcon->bl_val == 0) {
                 dcon->disp_mode &= ~MODE_BL_ENABLE;
                 dcon_write(dcon, DCON_REG_MODE, dcon->disp_mode);
         } else if (!(dcon->disp_mode & MODE_BL_ENABLE)) {
                 dcon->disp_mode |= MODE_BL_ENABLE;
                 dcon_write(dcon, DCON_REG_MODE, dcon->disp_mode);
         }
 }
 
 /* Set the output type to either color or mono */
 static int dcon_set_mono_mode(struct dcon_priv *dcon, bool enable_mono)
 {
         if (dcon->mono == enable_mono)
                 return 0;
 
         dcon->mono = enable_mono;
 
         if (enable_mono) {
                 dcon->disp_mode &= ~(MODE_CSWIZZLE | MODE_COL_AA);
                 dcon->disp_mode |= MODE_MONO_LUMA;
         } else {
                 dcon->disp_mode &= ~(MODE_MONO_LUMA);
                 dcon->disp_mode |= MODE_CSWIZZLE | MODE_COL_AA;
         }
 
         dcon_write(dcon, DCON_REG_MODE, dcon->disp_mode);
         return 0;
 }
 
 /* For now, this will be really stupid - we need to address how
  * DCONLOAD works in a sleep and account for it accordingly
  */
 
 static void dcon_sleep(struct dcon_priv *dcon, bool sleep)
 {
         int x;
 
         /* Turn off the backlight and put the DCON to sleep */
 
         if (dcon->asleep == sleep)
                 return;
 
         if (!olpc_board_at_least(olpc_board(0xc2)))
                 return;
 
         if (sleep) {
                 x = 0;
                 x = olpc_ec_cmd(0x26, (unsigned char *)&x, 1, NULL, 0);
                 if (x)
                         pr_warn("unable to force dcon to power down: %d!\n", x);
                 else
                         dcon->asleep = sleep;
         } else {
                 /* Only re-enable the backlight if the backlight value is set */
                 if (dcon->bl_val != 0)
                         dcon->disp_mode |= MODE_BL_ENABLE;
                 x = dcon_bus_stabilize(dcon, 1);
                 if (x)
                         pr_warn("unable to reinit dcon hardware: %d!\n", x);
                 else
                         dcon->asleep = sleep;
 
                 /* Restore backlight */
                 dcon_set_backlight(dcon, dcon->bl_val);
         }
 
         /* We should turn off some stuff in the framebuffer - but what? */
 }
 
 /* the DCON seems to get confused if we change DCONLOAD too
  * frequently -- i.e., approximately faster than frame time.
  * normally we don't change it this fast, so in general we won't
  * delay here.
  */
 static void dcon_load_holdoff(struct dcon_priv *dcon)
 {
         struct timespec delta_t, now;
         while (1) {
                 getnstimeofday(&now);
                 delta_t = timespec_sub(now, dcon->load_time);
                 if (delta_t.tv_sec != 0 ||
                         delta_t.tv_nsec > NSEC_PER_MSEC * 20) {
                         break;
                 }
                 mdelay(4);
         }
 }
 
 static bool dcon_blank_fb(struct dcon_priv *dcon, bool blank)
 {
         int err;
 
         if (!lock_fb_info(dcon->fbinfo)) {
                 dev_err(&dcon->client->dev, "unable to lock framebuffer\n");
                 return false;
         }
         console_lock();
         dcon->ignore_fb_events = true;
         err = fb_blank(dcon->fbinfo,
                         blank ? FB_BLANK_POWERDOWN : FB_BLANK_UNBLANK);
         dcon->ignore_fb_events = false;
         console_unlock();
         unlock_fb_info(dcon->fbinfo);
 
         if (err) {
                 dev_err(&dcon->client->dev, "couldn't %sblank framebuffer\n",
                                 blank ? "" : "un");
                 return false;
         }
         return true;
 }
 
 /* Set the source of the display (CPU or DCON) */
 static void dcon_source_switch(struct work_struct *work)
 {
         struct dcon_priv *dcon = container_of(work, struct dcon_priv,
                         switch_source);
         int source = dcon->pending_src;
 
         if (dcon->curr_src == source)
                 return;
 
         dcon_load_holdoff(dcon);
 
         dcon->switched = false;
 
         switch (source) {
         case DCON_SOURCE_CPU:
                 pr_info("dcon_source_switch to CPU\n");
                 /* Enable the scanline interrupt bit */
                 if (dcon_write(dcon, DCON_REG_MODE,
                                 dcon->disp_mode | MODE_SCAN_INT))
                         pr_err("couldn't enable scanline interrupt!\n");
                 else
                         /* Wait up to one second for the scanline interrupt */
                         wait_event_timeout(dcon->waitq, dcon->switched, HZ);
 
                 if (!dcon->switched)
                         pr_err("Timeout entering CPU mode; expect a screen glitch.\n");
 
                 /* Turn off the scanline interrupt */
                 if (dcon_write(dcon, DCON_REG_MODE, dcon->disp_mode))
                         pr_err("couldn't disable scanline interrupt!\n");
 
                 /*
                  * Ideally we'd like to disable interrupts here so that the
                  * fb unblanking and DCON turn on happen at a known time value;
                  * however, we can't do that right now with fb_blank
                  * messing with semaphores.
                  *
                  * For now, we just hope..
                  */
                 if (!dcon_blank_fb(dcon, false)) {
                         pr_err("Failed to enter CPU mode\n");
                         dcon->pending_src = DCON_SOURCE_DCON;
                         return;
                 }
 
                 /* And turn off the DCON */
                 pdata->set_dconload(1);
                 getnstimeofday(&dcon->load_time);
 
                 pr_info("The CPU has control\n");
                 break;
         case DCON_SOURCE_DCON:
         {
                 struct timespec delta_t;
 
                 pr_info("dcon_source_switch to DCON\n");
 
                 /* Clear DCONLOAD - this implies that the DCON is in control */
                 pdata->set_dconload(0);
                 getnstimeofday(&dcon->load_time);
 
                 wait_event_timeout(dcon->waitq, dcon->switched, HZ/2);
 
                 if (!dcon->switched) {
                         pr_err("Timeout entering DCON mode; expect a screen glitch.\n");
                 } else {
                         /* sometimes the DCON doesn't follow its own rules,
                          * and doesn't wait for two vsync pulses before
                          * ack'ing the frame load with an IRQ.  the result
                          * is that the display shows the *previously*
                          * loaded frame.  we can detect this by looking at
                          * the time between asserting DCONLOAD and the IRQ --
                          * if it's less than 20msec, then the DCON couldn't
                          * have seen two VSYNC pulses.  in that case we
                          * deassert and reassert, and hope for the best.
                          * see http://dev.laptop.org/ticket/9664
                          */
                         delta_t = timespec_sub(dcon->irq_time, dcon->load_time);
                         if (dcon->switched && delta_t.tv_sec == 0 &&
                                         delta_t.tv_nsec < NSEC_PER_MSEC * 20) {
                                 pr_err("missed loading, retrying\n");
                                 pdata->set_dconload(1);
                                 mdelay(41);
                                 pdata->set_dconload(0);
                                 getnstimeofday(&dcon->load_time);
                                 mdelay(41);
                         }
                 }
 
                 dcon_blank_fb(dcon, true);
                 pr_info("The DCON has control\n");
                 break;
         }
         default:
                 BUG();
         }
 
         dcon->curr_src = source;
 }
 
 static void dcon_set_source(struct dcon_priv *dcon, int arg)
 {
         if (dcon->pending_src == arg)
                 return;
 
         dcon->pending_src = arg;
 
         if ((dcon->curr_src != arg) && !work_pending(&dcon->switch_source))
                 schedule_work(&dcon->switch_source);
 }
 
 static void dcon_set_source_sync(struct dcon_priv *dcon, int arg)
 {
         dcon_set_source(dcon, arg);
         flush_scheduled_work();
 }
 
 static ssize_t dcon_mode_show(struct device *dev,
         struct device_attribute *attr, char *buf)
 {
         struct dcon_priv *dcon = dev_get_drvdata(dev);
         return sprintf(buf, "%4.4X\n", dcon->disp_mode);
 }
 
 static ssize_t dcon_sleep_show(struct device *dev,
         struct device_attribute *attr, char *buf)
 {
 
         struct dcon_priv *dcon = dev_get_drvdata(dev);
         return sprintf(buf, "%d\n", dcon->asleep);
 }
 
 static ssize_t dcon_freeze_show(struct device *dev,
         struct device_attribute *attr, char *buf)
 {
         struct dcon_priv *dcon = dev_get_drvdata(dev);
         return sprintf(buf, "%d\n", dcon->curr_src == DCON_SOURCE_DCON ? 1 : 0);
 }
 
 static ssize_t dcon_mono_show(struct device *dev,
         struct device_attribute *attr, char *buf)
 {
         struct dcon_priv *dcon = dev_get_drvdata(dev);
         return sprintf(buf, "%d\n", dcon->mono);
 }
 
 static ssize_t dcon_resumeline_show(struct device *dev,
         struct device_attribute *attr, char *buf)
 {
         return sprintf(buf, "%d\n", resumeline);
 }
 
 static ssize_t dcon_mono_store(struct device *dev,
         struct device_attribute *attr, const char *buf, size_t count)
 {
         unsigned long enable_mono;
         int rc;
 
         rc = kstrtoul(buf, 10, &enable_mono);
         if (rc)
                 return rc;
 
         dcon_set_mono_mode(dev_get_drvdata(dev), enable_mono ? true : false);
 
         return count;
 }
 
 static ssize_t dcon_freeze_store(struct device *dev,
         struct device_attribute *attr, const char *buf, size_t count)
 {
         struct dcon_priv *dcon = dev_get_drvdata(dev);
         unsigned long output;
         int ret;
 
         ret = kstrtoul(buf, 10, &output);
         if (ret)
                 return ret;
 
         pr_info("dcon_freeze_store: %lu\n", output);
 
         switch (output) {
         case 0:
                 dcon_set_source(dcon, DCON_SOURCE_CPU);
                 break;
         case 1:
                 dcon_set_source_sync(dcon, DCON_SOURCE_DCON);
                 break;
         case 2:  /* normally unused */
                 dcon_set_source(dcon, DCON_SOURCE_DCON);
                 break;
         default:
                 return -EINVAL;
         }
 
         return count;
 }
 
 static ssize_t dcon_resumeline_store(struct device *dev,
         struct device_attribute *attr, const char *buf, size_t count)
 {
         unsigned short rl;
         int rc;
 
         rc = kstrtou16(buf, 10, &rl);
         if (rc)
                 return rc;
 
         resumeline = rl;
         dcon_write(dev_get_drvdata(dev), DCON_REG_SCAN_INT, resumeline);
 
         return count;
 }
 
 static ssize_t dcon_sleep_store(struct device *dev,
         struct device_attribute *attr, const char *buf, size_t count)
 {
         unsigned long output;
         int ret;
 
         ret = kstrtoul(buf, 10, &output);
         if (ret)
                 return ret;
 
         dcon_sleep(dev_get_drvdata(dev), output ? true : false);
         return count;
 }
 
 static struct device_attribute dcon_device_files[] = {
         __ATTR(mode, 0444, dcon_mode_show, NULL),
         __ATTR(sleep, 0644, dcon_sleep_show, dcon_sleep_store),
         __ATTR(freeze, 0644, dcon_freeze_show, dcon_freeze_store),
         __ATTR(monochrome, 0644, dcon_mono_show, dcon_mono_store),
         __ATTR(resumeline, 0644, dcon_resumeline_show, dcon_resumeline_store),
 };
 
 static int dcon_bl_update(struct backlight_device *dev)
 {
         struct dcon_priv *dcon = bl_get_data(dev);
         u8 level = dev->props.brightness & 0x0F;
 
         if (dev->props.power != FB_BLANK_UNBLANK)
                 level = 0;
 
         if (level != dcon->bl_val)
                 dcon_set_backlight(dcon, level);
 
         /* power down the DCON when the screen is blanked */
         if (!dcon->ignore_fb_events)
                 dcon_sleep(dcon, !!(dev->props.state & BL_CORE_FBBLANK));
 
         return 0;
 }
 
 static int dcon_bl_get(struct backlight_device *dev)
 {
         struct dcon_priv *dcon = bl_get_data(dev);
         return dcon->bl_val;
 }
 
 static const struct backlight_ops dcon_bl_ops = {
         .update_status = dcon_bl_update,
         .get_brightness = dcon_bl_get,
 };
 
 static struct backlight_properties dcon_bl_props = {
         .max_brightness = 15,
         .type = BACKLIGHT_RAW,
         .power = FB_BLANK_UNBLANK,
 };
 
 static int dcon_reboot_notify(struct notifier_block *nb,
                               unsigned long foo, void *bar)
 {
         struct dcon_priv *dcon = container_of(nb, struct dcon_priv, reboot_nb);
 
         if (!dcon || !dcon->client)
                 return 0;
 
         /* Turn off the DCON. Entirely. */
         dcon_write(dcon, DCON_REG_MODE, 0x39);
         dcon_write(dcon, DCON_REG_MODE, 0x32);
         return 0;
 }
 
 static int unfreeze_on_panic(struct notifier_block *nb,
                              unsigned long e, void *p)
 {
         pdata->set_dconload(1);
         return NOTIFY_DONE;
 }
 
 static struct notifier_block dcon_panic_nb = {
         .notifier_call = unfreeze_on_panic,
 };
 
 static int dcon_detect(struct i2c_client *client, struct i2c_board_info *info)
 {
         strlcpy(info->type, "olpc_dcon", I2C_NAME_SIZE);
 
         return 0;
 }
 
 static int dcon_probe(struct i2c_client *client, const struct i2c_device_id *id)
 {
         struct dcon_priv *dcon;
         int rc, i, j;
 
         if (!pdata)
                 return -ENXIO;
 
         dcon = kzalloc(sizeof(*dcon), GFP_KERNEL);
         if (!dcon)
                 return -ENOMEM;
 
         dcon->client = client;
         init_waitqueue_head(&dcon->waitq);
         INIT_WORK(&dcon->switch_source, dcon_source_switch);
         dcon->reboot_nb.notifier_call = dcon_reboot_notify;
         dcon->reboot_nb.priority = -1;
 
         i2c_set_clientdata(client, dcon);
 
         if (num_registered_fb < 1) {
                 dev_err(&client->dev, "DCON driver requires a registered fb\n");
                 rc = -EIO;
                 goto einit;
         }
         dcon->fbinfo = registered_fb[0];
 
         rc = dcon_hw_init(dcon, 1);
         if (rc)
                 goto einit;
 
         /* Add the DCON device */
 
         dcon_device = platform_device_alloc("dcon", -1);
 
         if (dcon_device == NULL) {
                 pr_err("Unable to create the DCON device\n");
                 rc = -ENOMEM;
                 goto eirq;
         }
         rc = platform_device_add(dcon_device);
         platform_set_drvdata(dcon_device, dcon);
 
         if (rc) {
                 pr_err("Unable to add the DCON device\n");
                 goto edev;
         }
 
         for (i = 0; i < ARRAY_SIZE(dcon_device_files); i++) {
                 rc = device_create_file(&dcon_device->dev,
                                         &dcon_device_files[i]);
                 if (rc) {
                         dev_err(&dcon_device->dev, "Cannot create sysfs file\n");
                         goto ecreate;
                 }
         }
 
         dcon->bl_val = dcon_read(dcon, DCON_REG_BRIGHT) & 0x0F;
 
         /* Add the backlight device for the DCON */
         dcon_bl_props.brightness = dcon->bl_val;
         dcon->bl_dev = backlight_device_register("dcon-bl", &dcon_device->dev,
                 dcon, &dcon_bl_ops, &dcon_bl_props);
         if (IS_ERR(dcon->bl_dev)) {
                 dev_err(&client->dev, "cannot register backlight dev (%ld)\n",
                                 PTR_ERR(dcon->bl_dev));
                 dcon->bl_dev = NULL;
         }
 
         register_reboot_notifier(&dcon->reboot_nb);
         atomic_notifier_chain_register(&panic_notifier_list, &dcon_panic_nb);
 
         return 0;
 
  ecreate:
         for (j = 0; j < i; j++)
                 device_remove_file(&dcon_device->dev, &dcon_device_files[j]);
  edev:
         platform_device_unregister(dcon_device);
         dcon_device = NULL;
  eirq:
         free_irq(DCON_IRQ, dcon);
  einit:
         kfree(dcon);
         return rc;
 }
 
 static int dcon_remove(struct i2c_client *client)
 {
         struct dcon_priv *dcon = i2c_get_clientdata(client);
 
         unregister_reboot_notifier(&dcon->reboot_nb);
         atomic_notifier_chain_unregister(&panic_notifier_list, &dcon_panic_nb);
 
         free_irq(DCON_IRQ, dcon);
 
         if (dcon->bl_dev)
                 backlight_device_unregister(dcon->bl_dev);
 
         if (dcon_device != NULL)
                 platform_device_unregister(dcon_device);
         cancel_work_sync(&dcon->switch_source);
 
         kfree(dcon);
 
         return 0;
 }
 
 #ifdef CONFIG_PM
 static int dcon_suspend(struct device *dev)
 {
         struct i2c_client *client = to_i2c_client(dev);
         struct dcon_priv *dcon = i2c_get_clientdata(client);
 
         if (!dcon->asleep) {
                 /* Set up the DCON to have the source */
                 dcon_set_source_sync(dcon, DCON_SOURCE_DCON);
         }
 
         return 0;
 }
 
 static int dcon_resume(struct device *dev)
 {
         struct i2c_client *client = to_i2c_client(dev);
         struct dcon_priv *dcon = i2c_get_clientdata(client);
 
         if (!dcon->asleep) {
                 dcon_bus_stabilize(dcon, 0);
                 dcon_set_source(dcon, DCON_SOURCE_CPU);
         }
 
         return 0;
 }
 
 #else
 
 #define dcon_suspend NULL
 #define dcon_resume NULL
 
 #endif /* CONFIG_PM */
 
 
 irqreturn_t dcon_interrupt(int irq, void *id)
 {
         struct dcon_priv *dcon = id;
         u8 status;
 
         if (pdata->read_status(&status))
                 return IRQ_NONE;
 
         switch (status & 3) {
         case 3:
                 pr_debug("DCONLOAD_MISSED interrupt\n");
                 break;
 
         case 2: /* switch to DCON mode */
         case 1: /* switch to CPU mode */
                 dcon->switched = true;
                 getnstimeofday(&dcon->irq_time);
                 wake_up(&dcon->waitq);
                 break;
 
         case 0:
                 /* workaround resume case:  the DCON (on 1.5) doesn't
                  * ever assert status 0x01 when switching to CPU mode
                  * during resume.  this is because DCONLOAD is de-asserted
                  * _immediately_ upon exiting S3, so the actual release
                  * of the DCON happened long before this point.
                  * see http://dev.laptop.org/ticket/9869
                  */
                 if (dcon->curr_src != dcon->pending_src && !dcon->switched) {
                         dcon->switched = true;
                         getnstimeofday(&dcon->irq_time);
                         wake_up(&dcon->waitq);
                         pr_debug("switching w/ status 0/0\n");
                 } else {
                         pr_debug("scanline interrupt w/CPU\n");
                 }
         }
 
         return IRQ_HANDLED;
 }
 
 static const struct dev_pm_ops dcon_pm_ops = {
         .suspend = dcon_suspend,
         .resume = dcon_resume,
 };
 
 static const struct i2c_device_id dcon_idtable[] = {
         { "olpc_dcon",  0 },
         { }
 };
 MODULE_DEVICE_TABLE(i2c, dcon_idtable);
 
 struct i2c_driver dcon_driver = {
         .driver = {
                 .name   = "olpc_dcon",
                 .pm = &dcon_pm_ops,
         },
         .class = I2C_CLASS_DDC | I2C_CLASS_HWMON,
         .id_table = dcon_idtable,
         .probe = dcon_probe,
         .remove = dcon_remove,
         .detect = dcon_detect,
         .address_list = normal_i2c,
 };
 
 static int __init olpc_dcon_init(void)
 {
 #ifdef CONFIG_FB_OLPC_DCON_1_5
         /* XO-1.5 */
         if (olpc_board_at_least(olpc_board(0xd0)))
                 pdata = &dcon_pdata_xo_1_5;
 #endif
 #ifdef CONFIG_FB_OLPC_DCON_1
         if (!pdata)
                 pdata = &dcon_pdata_xo_1;
 #endif
 
         return i2c_add_driver(&dcon_driver);
 }
 
 static void __exit olpc_dcon_exit(void)
 {
         i2c_del_driver(&dcon_driver);
 }
 
 module_init(olpc_dcon_init);
 module_exit(olpc_dcon_exit);
 
 MODULE_LICENSE("GPL");
 

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