ASoC: Fix resource reclaim for osk5912

[mirror_ubuntu-zesty-kernel.git] / drivers / staging / olpc_dcon / olpc_dcon.c

/*
 * 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  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.
 */


#include <linux/kernel.h>
#include <linux/fb.h>
#include <linux/console.h>
#include <linux/i2c.h>
#include <linux/platform_device.h>
#include <linux/i2c-id.h>
#include <linux/pci.h>
#include <linux/pci_ids.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/backlight.h>
#include <linux/device.h>
#include <linux/notifier.h>
#include <asm/uaccess.h>
#include <linux/ctype.h>
#include <linux/reboot.h>
#include <linux/gpio.h>
#include <asm/tsc.h>
#include <asm/olpc.h>

#include "olpc_dcon.h"

/* Module definitions */

static int resumeline = 898;
module_param(resumeline, int, 0444);

static int noinit;
module_param(noinit, int, 0444);

/* Default off since it doesn't work on DCON ASIC in B-test OLPC board */
static int useaa = 1;
module_param(useaa, int, 0444);

struct dcon_platform_data {
        int (*init)(void);
        void (*bus_stabilize_wiggle)(void);
        void (*set_dconload)(int);
        int (*read_status)(void);
};

static struct dcon_platform_data *pdata;

/* I2C structures */

static struct i2c_driver dcon_driver;
static struct i2c_client *dcon_client;

/* Platform devices */
static struct platform_device *dcon_device;

/* Backlight device */
static struct backlight_device *dcon_bl_dev;

static struct fb_info *fbinfo;

/* set this to 1 while controlling fb blank state from this driver */
static int ignore_fb_events = 0;

/* Current source, initialized at probe time */
static int dcon_source;

/* Desired source */
static int dcon_pending;

/* Current output type */
static int dcon_output = DCON_OUTPUT_COLOR;

/* Current sleep status (not yet implemented) */
static int dcon_sleep_val = DCON_ACTIVE;

/* Shadow register for the DCON_REG_MODE register */
static unsigned short dcon_disp_mode;

/* Variables used during switches */
static int dcon_switched;
static struct timespec dcon_irq_time;
static struct timespec dcon_load_time; 

static DECLARE_WAIT_QUEUE_HEAD(dcon_wait_queue);

static unsigned short normal_i2c[] = { 0x0d, I2C_CLIENT_END };

#define dcon_write(reg,val) i2c_smbus_write_word_data(dcon_client,reg,val)
#define dcon_read(reg) i2c_smbus_read_word_data(dcon_client,reg)

/* The current backlight value - this saves us some smbus traffic */
static int bl_val = -1;

/* ===== API functions - these are called by a variety of users ==== */

static int dcon_hw_init(struct i2c_client *client, int is_init)
{
        uint16_t ver;
        int rc = 0;

        ver = i2c_smbus_read_word_data(client, DCON_REG_ID);
        if ((ver >> 8) != 0xDC) {
                printk(KERN_ERR "olpc-dcon:  DCON ID not 0xDCxx: 0x%04x "
                                "instead.\n", ver);
                rc = -ENXIO;
                goto err;
        }

        if (is_init) {
                printk(KERN_INFO "olpc-dcon:  Discovered DCON version %x\n",
                                ver & 0xFF);
                if ((rc = pdata->init()) != 0) {
                        printk(KERN_ERR "olpc-dcon:  Unable to init.\n");
                        goto err;
                }
        }

        if (ver < 0xdc02 && !noinit) {
                /* Initialize the DCON registers */

                /* Start with work-arounds for DCON ASIC */
                i2c_smbus_write_word_data(client, 0x4b, 0x00cc);
                i2c_smbus_write_word_data(client, 0x4b, 0x00cc);
                i2c_smbus_write_word_data(client, 0x4b, 0x00cc);
                i2c_smbus_write_word_data(client, 0x0b, 0x007a);
                i2c_smbus_write_word_data(client, 0x36, 0x025c);
                i2c_smbus_write_word_data(client, 0x37, 0x025e);
                
                /* Initialise SDRAM */

                i2c_smbus_write_word_data(client, 0x3b, 0x002b);
                i2c_smbus_write_word_data(client, 0x41, 0x0101);
                i2c_smbus_write_word_data(client, 0x42, 0x0101);
        }
        else if (!noinit) {
                /* SDRAM setup/hold time */
                i2c_smbus_write_word_data(client, 0x3a, 0xc040);
                i2c_smbus_write_word_data(client, 0x41, 0x0000);
                i2c_smbus_write_word_data(client, 0x41, 0x0101);
                i2c_smbus_write_word_data(client, 0x42, 0x0101);
        }

        /* Colour swizzle, AA, no passthrough, backlight */
        if (is_init) {
                dcon_disp_mode = MODE_PASSTHRU | MODE_BL_ENABLE | MODE_CSWIZZLE;
                if (useaa)
                        dcon_disp_mode |= MODE_COL_AA;
        }
        i2c_smbus_write_word_data(client, DCON_REG_MODE, dcon_disp_mode);


        /* Set the scanline to interrupt on during resume */
        i2c_smbus_write_word_data(client, 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 i2c_client *client, int is_powered_down)
{
        unsigned long timeout;
        int x;

power_up:
        if (is_powered_down) {
                x = 1;
                if ((x = olpc_ec_cmd(0x26, (unsigned char *) &x, 1, NULL, 0))) {
                        printk(KERN_WARNING "olpc-dcon:  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_REG_ID);
        }
        if (x < 0) {
                printk(KERN_ERR "olpc-dcon:  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(client, 0);
        return 0;
}

static int dcon_get_backlight(void)
{
        if (dcon_client == NULL)
                return 0;

        if (bl_val == -1)
                bl_val = dcon_read(DCON_REG_BRIGHT) & 0x0F;

        return bl_val;
}


static void dcon_set_backlight_hw(int level)
{
        bl_val = level & 0x0F;
        dcon_write(DCON_REG_BRIGHT, bl_val);

        /* Purposely turn off the backlight when we go to level 0 */
        if (bl_val == 0) {
                dcon_disp_mode &= ~MODE_BL_ENABLE;
                dcon_write(DCON_REG_MODE, dcon_disp_mode);
        } else if (!(dcon_disp_mode & MODE_BL_ENABLE)) {
                dcon_disp_mode |= MODE_BL_ENABLE;
                dcon_write(DCON_REG_MODE, dcon_disp_mode);
        }
}

static void dcon_set_backlight(int level)
{
        if (dcon_client == NULL)
                return;

        if (bl_val == (level & 0x0F))
                return;

        dcon_set_backlight_hw(level);
}

/* Set the output type to either color or mono */

static int dcon_set_output(int arg)
{
        if (dcon_output == arg)
                return 0;

        dcon_output = arg;

        if (arg == DCON_OUTPUT_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;
                if (useaa)
                        dcon_disp_mode |= MODE_COL_AA;
        }

        dcon_write(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(int state)
{
        int x;

        /* Turn off the backlight and put the DCON to sleep */

        if (state == dcon_sleep_val)
                return;

        if (!olpc_board_at_least(olpc_board(0xc2)))
                return;

        if (state == DCON_SLEEP) {
                x = 0;
                if ((x = olpc_ec_cmd(0x26, (unsigned char *) &x, 1, NULL, 0)))
                        printk(KERN_WARNING "olpc-dcon:  unable to force dcon "
                                        "to power down: %d!\n", x);
                else
                        dcon_sleep_val = state;
        }
        else {
                /* Only re-enable the backlight if the backlight value is set */
                if (bl_val != 0)
                        dcon_disp_mode |= MODE_BL_ENABLE;

                if ((x=dcon_bus_stabilize(dcon_client, 1)))
                        printk(KERN_WARNING "olpc-dcon:  unable to reinit dcon"
                                        " hardware: %d!\n", x);
                else
                        dcon_sleep_val = state;

                /* Restore backlight */
                dcon_set_backlight_hw(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.
 */
void dcon_load_holdoff(void)
{
        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);
        }
}
/* Set the source of the display (CPU or DCON) */

static void dcon_source_switch(struct work_struct *work)
{
        DECLARE_WAITQUEUE(wait, current);
        int source = dcon_pending;

        if (dcon_source == source)
                return;

        dcon_load_holdoff();

        dcon_switched = 0;

        switch (source) {
        case DCON_SOURCE_CPU:
                printk("dcon_source_switch to CPU\n");
                /* Enable the scanline interrupt bit */
                if (dcon_write(DCON_REG_MODE, dcon_disp_mode | MODE_SCAN_INT))
                        printk(KERN_ERR "olpc-dcon:  couldn't enable scanline interrupt!\n");
                else {
                        /* Wait up to one second for the scanline interrupt */
                        wait_event_timeout(dcon_wait_queue, dcon_switched == 1, HZ);
                }

                if (!dcon_switched)
                        printk(KERN_ERR "olpc-dcon:  Timeout entering CPU mode; expect a screen glitch.\n");

                /* Turn off the scanline interrupt */
                if (dcon_write(DCON_REG_MODE, dcon_disp_mode))
                        printk(KERN_ERR "olpc-dcon:  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..
                 */
                acquire_console_sem();
                ignore_fb_events = 1;
                if (fb_blank(fbinfo, FB_BLANK_UNBLANK)) {
                        ignore_fb_events = 0;
                        release_console_sem();
                        printk(KERN_ERR "olpc-dcon:  Failed to enter CPU mode\n");
                        dcon_pending = DCON_SOURCE_DCON;
                        return;
                }
                ignore_fb_events = 0;
                release_console_sem();

                /* And turn off the DCON */
                pdata->set_dconload(1);
                getnstimeofday(&dcon_load_time);

                printk(KERN_INFO "olpc-dcon: The CPU has control\n");
                break;
        case DCON_SOURCE_DCON:
        {
                int t;
                struct timespec delta_t;

                printk("dcon_source_switch to DCON\n");

                add_wait_queue(&dcon_wait_queue, &wait);
                set_current_state(TASK_UNINTERRUPTIBLE);

                /* Clear DCONLOAD - this implies that the DCON is in control */
                pdata->set_dconload(0);
                getnstimeofday(&dcon_load_time);

                t = schedule_timeout(HZ/2);
                remove_wait_queue(&dcon_wait_queue, &wait);
                set_current_state(TASK_RUNNING);

                if (!dcon_switched) {
                        printk(KERN_ERR "olpc-dcon: 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) {
                                printk(KERN_ERR "olpc-dcon: missed loading, retrying\n");
                                pdata->set_dconload(1);
                                mdelay(41);
                                pdata->set_dconload(0);
                                getnstimeofday(&dcon_load_time);
                                mdelay(41);
                        }
                }

                acquire_console_sem();
                ignore_fb_events = 1;
                if (fb_blank(fbinfo, FB_BLANK_POWERDOWN))
                        printk(KERN_ERR "olpc-dcon:  couldn't blank fb!\n");
                ignore_fb_events = 0;
                release_console_sem();

                printk(KERN_INFO "olpc-dcon: The DCON has control\n");
                break;
        }
        default:
                BUG();
        }

        dcon_source = source;
}

static DECLARE_WORK(dcon_work, dcon_source_switch);

static void dcon_set_source(int arg)
{
        if (dcon_pending == arg)
                return;

        dcon_pending = arg;

        if ((dcon_source != arg) && !work_pending(&dcon_work))
                schedule_work(&dcon_work);
}

static void dcon_set_source_sync(int arg)
{
        dcon_set_source(arg);
        flush_scheduled_work();
}

static int dconbl_set(struct backlight_device *dev) {

        int level = dev->props.brightness;

        if (dev->props.power != FB_BLANK_UNBLANK)
                level = 0;

        dcon_set_backlight(level);
        return 0;
}

static int dconbl_get(struct backlight_device *dev) {
        return dcon_get_backlight();
}

static ssize_t dcon_mode_show(struct device *dev,
        struct device_attribute *attr, char *buf)
{
        return sprintf(buf, "%4.4X\n", dcon_disp_mode);
}

static ssize_t dcon_sleep_show(struct device *dev,
        struct device_attribute *attr, char *buf)
{

        return sprintf(buf, "%d\n", dcon_sleep_val);
}

static ssize_t dcon_freeze_show(struct device *dev,
        struct device_attribute *attr, char *buf)
{
        return sprintf(buf, "%d\n", dcon_source == DCON_SOURCE_DCON ? 1 : 0);
}

static ssize_t dcon_output_show(struct device *dev,
        struct device_attribute *attr, char *buf)
{
        return sprintf(buf, "%d\n", dcon_output);
}

static ssize_t dcon_resumeline_show(struct device *dev,
        struct device_attribute *attr, char *buf)
{
        return sprintf(buf, "%d\n", resumeline);
}

static int _strtoul(const char *buf, int len, unsigned int *val)
{

        char *endp;
        unsigned int output = simple_strtoul(buf, &endp, 0);
        int size = endp - buf;

        if (*endp && isspace(*endp))
                size++;

        if (size != len)
                return -EINVAL;

        *val = output;
        return 0;
}

static ssize_t dcon_output_store(struct device *dev,
        struct device_attribute *attr, const char *buf, size_t count)
{
        int output;
        int rc = -EINVAL;

        if (_strtoul(buf, count, &output))
                return -EINVAL;

        if (output == DCON_OUTPUT_COLOR || output == DCON_OUTPUT_MONO) {
                dcon_set_output(output);
                rc = count;
        }

        return rc;
}

static ssize_t dcon_freeze_store(struct device *dev,
        struct device_attribute *attr, const char *buf, size_t count)
{
        int output;

        if (_strtoul(buf, count, &output))
                return -EINVAL;

        printk("dcon_freeze_store: %d\n", output);

        switch (output) {
        case 0:
                dcon_set_source(DCON_SOURCE_CPU);
                break;
        case 1:
                dcon_set_source_sync(DCON_SOURCE_DCON);
                break;
        case 2:  // normally unused
                dcon_set_source(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)
{
        int rl;
        int rc = -EINVAL;

        if (_strtoul(buf, count, &rl))
                return rc;

        resumeline = rl;
        dcon_write(DCON_REG_SCAN_INT, resumeline);
        rc = count;

        return rc;
}

static ssize_t dcon_sleep_store(struct device *dev,
        struct device_attribute *attr, const char *buf, size_t count)
{
        int output;

        if (_strtoul(buf, count, &output))
                return -EINVAL;

        dcon_sleep(output ? DCON_SLEEP : DCON_ACTIVE);
        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(output, 0644, dcon_output_show, dcon_output_store),
        __ATTR(resumeline, 0644, dcon_resumeline_show, dcon_resumeline_store),
};

static struct backlight_ops dcon_bl_ops = {
        .get_brightness = dconbl_get,
        .update_status = dconbl_set
};


static int dcon_reboot_notify(struct notifier_block *nb, unsigned long foo, void *bar)
{
        if (dcon_client == NULL)
                return 0;

        /* Turn off the DCON. Entirely. */
        dcon_write(DCON_REG_MODE, 0x39);
        dcon_write(DCON_REG_MODE, 0x32);
        return 0;
}

static struct notifier_block dcon_nb = {
        .notifier_call = dcon_reboot_notify,
        .priority = -1,
};

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,
};

/*
 * When the framebuffer sleeps due to external sources (e.g. user idle), power
 * down the DCON as well.  Power it back up when the fb comes back to life.
 */
static int fb_notifier_callback(struct notifier_block *self, unsigned long event, void *data)
{
        struct fb_event *evdata = data;
        int *blank = (int *) evdata->data;
        if (((event != FB_EVENT_BLANK) && (event != FB_EVENT_CONBLANK)) ||
                        ignore_fb_events)
                return 0;
        dcon_sleep((*blank) ? DCON_SLEEP : DCON_ACTIVE);
        return 0;
}

static struct notifier_block fb_nb = {
        .notifier_call = fb_notifier_callback,
};

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)
{
        int rc, i;

        if (num_registered_fb >= 1)
                fbinfo = registered_fb[0];

        rc = dcon_hw_init(client, 1);
        if (rc)
                goto einit;

        /* Add the DCON device */

        dcon_device = platform_device_alloc("dcon", -1);

        if (dcon_device == NULL) {
                printk("dcon:  Unable to create the DCON device\n");
                rc = -ENOMEM;
                goto eirq;
        }
        /* Place holder...*/
        i2c_set_clientdata(client, dcon_device);

        if ((rc = platform_device_add(dcon_device))) {
                printk("dcon:  Unable to add the DCON device\n");
                goto edev;
        }

        for(i = 0; i < ARRAY_SIZE(dcon_device_files); i++)
                device_create_file(&dcon_device->dev, &dcon_device_files[i]);

        /* Add the backlight device for the DCON */

        dcon_client = client;

        dcon_bl_dev = backlight_device_register("dcon-bl", &dcon_device->dev,
                NULL, &dcon_bl_ops, NULL);

        if (IS_ERR(dcon_bl_dev)) {
                printk("Could not register the backlight device for the DCON (%ld)\n", PTR_ERR(dcon_bl_dev));
                dcon_bl_dev = NULL;
        }
        else {
                dcon_bl_dev->props.max_brightness = 15;
                dcon_bl_dev->props.power = FB_BLANK_UNBLANK;
                dcon_bl_dev->props.brightness = dcon_get_backlight();

                backlight_update_status(dcon_bl_dev);
        }

        register_reboot_notifier(&dcon_nb);
        atomic_notifier_chain_register(&panic_notifier_list, &dcon_panic_nb);
        fb_register_client(&fb_nb);

        return 0;

 edev:
        platform_device_unregister(dcon_device);
        dcon_device = NULL;
        i2c_set_clientdata(client, NULL);
 eirq:
        free_irq(DCON_IRQ, &dcon_driver);
 einit:
        return rc;
}

static int dcon_remove(struct i2c_client *client)
{
        dcon_client = NULL;

        fb_unregister_client(&fb_nb);
        unregister_reboot_notifier(&dcon_nb);
        atomic_notifier_chain_unregister(&panic_notifier_list, &dcon_panic_nb);

        free_irq(DCON_IRQ, &dcon_driver);

        if (dcon_bl_dev != NULL)
                backlight_device_unregister(dcon_bl_dev);

        if (dcon_device != NULL)
                platform_device_unregister(dcon_device);
        cancel_work_sync(&dcon_work);

        i2c_set_clientdata(client, NULL);

        return 0;
}

#ifdef CONFIG_PM
static int dcon_suspend(struct i2c_client *client, pm_message_t state)
{
        if (dcon_sleep_val == DCON_ACTIVE) {
                /* Set up the DCON to have the source */
                dcon_set_source_sync(DCON_SOURCE_DCON);
        }

        return 0;
}

static int dcon_resume(struct i2c_client *client)
{
        if (dcon_sleep_val == DCON_ACTIVE) {
                dcon_bus_stabilize(client, 0);
                dcon_set_source(DCON_SOURCE_CPU);
        }

        return 0;
}

#endif


static irqreturn_t dcon_interrupt(int irq, void *id)
{
        int status = pdata->read_status();

        if (status == -1)
                return IRQ_NONE;

        switch (status & 3) {
        case 3:
                printk(KERN_DEBUG "olpc-dcon: DCONLOAD_MISSED interrupt\n");
                break;

        case 2: /* switch to DCON mode */
        case 1: /* switch to CPU mode */
                dcon_switched = 1;
                getnstimeofday(&dcon_irq_time);
                wake_up(&dcon_wait_queue);
                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_source != dcon_pending && !dcon_switched) {
                        dcon_switched = 1;
                        getnstimeofday(&dcon_irq_time);
                        wake_up(&dcon_wait_queue);
                        printk(KERN_DEBUG "olpc-dcon: switching w/ status 0/0\n");
                } else {
                        printk(KERN_DEBUG "olpc-dcon: scanline interrupt w/CPU\n");
                }
        }

        return IRQ_HANDLED;
}

static struct i2c_device_id dcon_idtable[] = {
        { "olpc_dcon",  0 },
        { }
};

MODULE_DEVICE_TABLE(i2c, dcon_idtable);

static struct i2c_driver dcon_driver = {
        .driver = {
                .name   = "olpc_dcon",
        },
        .class = I2C_CLASS_DDC | I2C_CLASS_HWMON,
        .id_table = dcon_idtable,
        .probe = dcon_probe,
        .remove = __devexit_p(dcon_remove),
        .detect = dcon_detect,
        .address_list = normal_i2c,
#ifdef CONFIG_PM
        .suspend = dcon_suspend,
        .resume = dcon_resume,
#endif
};

#include "olpc_dcon_xo_1.c"

static int __init olpc_dcon_init(void)
{
        pdata = &dcon_pdata_xo_1;

        i2c_add_driver(&dcon_driver);
        return 0;
}

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");