auo_k190x.c

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/*
 * Common code for AUO-K190X framebuffer drivers
 *
 * Copyright (C) 2012 Heiko Stuebner <[email protected]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/gpio.h>
#include <linux/pm_runtime.h>
#include <linux/fb.h>
#include <linux/delay.h>
#include <linux/uaccess.h>
#include <linux/vmalloc.h>
#include <linux/regulator/consumer.h>

#include <video/auo_k190xfb.h>

#include "auo_k190x.h"

struct panel_info {
    int w;
    int h;
};

/* table of panel specific parameters to be indexed into by the board drivers */
static struct panel_info panel_table[] = {
    /* standard 6" */
    [AUOK190X_RESOLUTION_800_600] = {
        .w = 800,
        .h = 600,
    },
    /* standard 9" */
    [AUOK190X_RESOLUTION_1024_768] = {
        .w = 1024,
        .h = 768,
    },
};

/*
 * private I80 interface to the board driver
 */

static void auok190x_issue_data(struct auok190xfb_par *par, u16 data)
{
    par->board->set_ctl(par, AUOK190X_I80_WR, 0);
    par->board->set_hdb(par, data);
    par->board->set_ctl(par, AUOK190X_I80_WR, 1);
}

static void auok190x_issue_cmd(struct auok190xfb_par *par, u16 data)
{
    par->board->set_ctl(par, AUOK190X_I80_DC, 0);
    auok190x_issue_data(par, data);
    par->board->set_ctl(par, AUOK190X_I80_DC, 1);
}

static int auok190x_issue_pixels(struct auok190xfb_par *par, int size,
                 u16 *data)
{
    struct device *dev = par->info->device;
    int i;
    u16 tmp;

    if (size & 3) {
        dev_err(dev, "issue_pixels: size %d must be a multiple of 4\n",
            size);
        return -EINVAL;
    }

    for (i = 0; i < (size >> 1); i++) {
        par->board->set_ctl(par, AUOK190X_I80_WR, 0);

        /* simple reduction of 8bit staticgray to 4bit gray
         * combines 4 * 4bit pixel values into a 16bit value
         */
        tmp  = (data[2*i] & 0xF0) >> 4;
        tmp |= (data[2*i] & 0xF000) >> 8;
        tmp |= (data[2*i+1] & 0xF0) << 4;
        tmp |= (data[2*i+1] & 0xF000);

        par->board->set_hdb(par, tmp);
        par->board->set_ctl(par, AUOK190X_I80_WR, 1);
    }

    return 0;
}

static u16 auok190x_read_data(struct auok190xfb_par *par)
{
    u16 data;

    par->board->set_ctl(par, AUOK190X_I80_OE, 0);
    data = par->board->get_hdb(par);
    par->board->set_ctl(par, AUOK190X_I80_OE, 1);

    return data;
}

/*
 * Command interface for the controller drivers
 */

void auok190x_send_command_nowait(struct auok190xfb_par *par, u16 data)
{
    par->board->set_ctl(par, AUOK190X_I80_CS, 0);
    auok190x_issue_cmd(par, data);
    par->board->set_ctl(par, AUOK190X_I80_CS, 1);
}
EXPORT_SYMBOL_GPL(auok190x_send_command_nowait);

void auok190x_send_cmdargs_nowait(struct auok190xfb_par *par, u16 cmd,
                  int argc, u16 *argv)
{
    int i;

    par->board->set_ctl(par, AUOK190X_I80_CS, 0);
    auok190x_issue_cmd(par, cmd);

    for (i = 0; i < argc; i++)
        auok190x_issue_data(par, argv[i]);
    par->board->set_ctl(par, AUOK190X_I80_CS, 1);
}
EXPORT_SYMBOL_GPL(auok190x_send_cmdargs_nowait);

int auok190x_send_command(struct auok190xfb_par *par, u16 data)
{
    int ret;

    ret = par->board->wait_for_rdy(par);
    if (ret)
        return ret;

    auok190x_send_command_nowait(par, data);
    return 0;
}
EXPORT_SYMBOL_GPL(auok190x_send_command);

int auok190x_send_cmdargs(struct auok190xfb_par *par, u16 cmd,
               int argc, u16 *argv)
{
    int ret;

    ret = par->board->wait_for_rdy(par);
    if (ret)
        return ret;

    auok190x_send_cmdargs_nowait(par, cmd, argc, argv);
    return 0;
}
EXPORT_SYMBOL_GPL(auok190x_send_cmdargs);

int auok190x_read_cmdargs(struct auok190xfb_par *par, u16 cmd,
               int argc, u16 *argv)
{
    int i, ret;

    ret = par->board->wait_for_rdy(par);
    if (ret)
        return ret;

    par->board->set_ctl(par, AUOK190X_I80_CS, 0);
    auok190x_issue_cmd(par, cmd);

    for (i = 0; i < argc; i++)
        argv[i] = auok190x_read_data(par);
    par->board->set_ctl(par, AUOK190X_I80_CS, 1);

    return 0;
}
EXPORT_SYMBOL_GPL(auok190x_read_cmdargs);

void auok190x_send_cmdargs_pixels_nowait(struct auok190xfb_par *par, u16 cmd,
                  int argc, u16 *argv, int size, u16 *data)
{
    int i;

    par->board->set_ctl(par, AUOK190X_I80_CS, 0);

    auok190x_issue_cmd(par, cmd);

    for (i = 0; i < argc; i++)
        auok190x_issue_data(par, argv[i]);

    auok190x_issue_pixels(par, size, data);

    par->board->set_ctl(par, AUOK190X_I80_CS, 1);
}
EXPORT_SYMBOL_GPL(auok190x_send_cmdargs_pixels_nowait);

int auok190x_send_cmdargs_pixels(struct auok190xfb_par *par, u16 cmd,
                  int argc, u16 *argv, int size, u16 *data)
{
    int ret;

    ret = par->board->wait_for_rdy(par);
    if (ret)
        return ret;

    auok190x_send_cmdargs_pixels_nowait(par, cmd, argc, argv, size, data);

    return 0;
}
EXPORT_SYMBOL_GPL(auok190x_send_cmdargs_pixels);

/*
 * fbdefio callbacks - common on both controllers.
 */

static void auok190xfb_dpy_first_io(struct fb_info *info)
{
    /* tell runtime-pm that we wish to use the device in a short time */
    pm_runtime_get(info->device);
}

/* this is called back from the deferred io workqueue */
static void auok190xfb_dpy_deferred_io(struct fb_info *info,
                struct list_head *pagelist)
{
    struct fb_deferred_io *fbdefio = info->fbdefio;
    struct auok190xfb_par *par = info->par;
    u16 yres = info->var.yres;
    u16 xres = info->var.xres;
    u16 y1 = 0, h = 0;
    int prev_index = -1;
    struct page *cur;
    int h_inc;
    int threshold;

    if (!list_empty(pagelist))
        /* the device resume should've been requested through first_io,
         * if the resume did not finish until now, wait for it.
         */
        pm_runtime_barrier(info->device);
    else
        /* We reached this via the fsync or some other way.
         * In either case the first_io function did not run,
         * so we runtime_resume the device here synchronously.
         */
        pm_runtime_get_sync(info->device);

    /* Do a full screen update every n updates to prevent
     * excessive darkening of the Sipix display.
     * If we do this, there is no need to walk the pages.
     */
    if (par->need_refresh(par)) {
        par->update_all(par);
        goto out;
    }

    /* height increment is fixed per page */
    h_inc = DIV_ROUND_UP(PAGE_SIZE , xres);

    /* calculate number of pages from pixel height */
    threshold = par->consecutive_threshold / h_inc;
    if (threshold < 1)
        threshold = 1;

    /* walk the written page list and swizzle the data */
    list_for_each_entry(cur, &fbdefio->pagelist, lru) {
        if (prev_index < 0) {
            /* just starting so assign first page */
            y1 = (cur->index << PAGE_SHIFT) / xres;
            h = h_inc;
        } else if ((cur->index - prev_index) <= threshold) {
            /* page is within our threshold for single updates */
            h += h_inc * (cur->index - prev_index);
        } else {
            /* page not consecutive, issue previous update first */
            par->update_partial(par, y1, y1 + h);

            /* start over with our non consecutive page */
            y1 = (cur->index << PAGE_SHIFT) / xres;
            h = h_inc;
        }
        prev_index = cur->index;
    }

    /* if we still have any pages to update we do so now */
    if (h >= yres)
        /* its a full screen update, just do it */
        par->update_all(par);
    else
        par->update_partial(par, y1, min((u16) (y1 + h), yres));

out:
    pm_runtime_mark_last_busy(info->device);
    pm_runtime_put_autosuspend(info->device);
}

/*
 * framebuffer operations
 */

/*
 * this is the slow path from userspace. they can seek and write to
 * the fb. it's inefficient to do anything less than a full screen draw
 */
static ssize_t auok190xfb_write(struct fb_info *info, const char __user *buf,
                size_t count, loff_t *ppos)
{
    struct auok190xfb_par *par = info->par;
    unsigned long p = *ppos;
    void *dst;
    int err = 0;
    unsigned long total_size;

    if (info->state != FBINFO_STATE_RUNNING)
        return -EPERM;

    total_size = info->fix.smem_len;

    if (p > total_size)
        return -EFBIG;

    if (count > total_size) {
        err = -EFBIG;
        count = total_size;
    }

    if (count + p > total_size) {
        if (!err)
            err = -ENOSPC;

        count = total_size - p;
    }

    dst = (void *)(info->screen_base + p);

    if (copy_from_user(dst, buf, count))
        err = -EFAULT;

    if  (!err)
        *ppos += count;

    par->update_all(par);

    return (err) ? err : count;
}

static void auok190xfb_fillrect(struct fb_info *info,
                   const struct fb_fillrect *rect)
{
    struct auok190xfb_par *par = info->par;

    sys_fillrect(info, rect);

    par->update_all(par);
}

static void auok190xfb_copyarea(struct fb_info *info,
                   const struct fb_copyarea *area)
{
    struct auok190xfb_par *par = info->par;

    sys_copyarea(info, area);

    par->update_all(par);
}

static void auok190xfb_imageblit(struct fb_info *info,
                const struct fb_image *image)
{
    struct auok190xfb_par *par = info->par;

    sys_imageblit(info, image);

    par->update_all(par);
}

static int auok190xfb_check_var(struct fb_var_screeninfo *var,
                   struct fb_info *info)
{
    if (info->var.xres != var->xres || info->var.yres != var->yres ||
        info->var.xres_virtual != var->xres_virtual ||
        info->var.yres_virtual != var->yres_virtual) {
        pr_info("%s: Resolution not supported: X%u x Y%u\n",
             __func__, var->xres, var->yres);
        return -EINVAL;
    }

    /*
     *  Memory limit
     */

    if ((info->fix.line_length * var->yres_virtual) > info->fix.smem_len) {
        pr_info("%s: Memory Limit requested yres_virtual = %u\n",
             __func__, var->yres_virtual);
        return -ENOMEM;
    }

    return 0;
}

static struct fb_ops auok190xfb_ops = {
    .owner      = THIS_MODULE,
    .fb_read    = fb_sys_read,
    .fb_write   = auok190xfb_write,
    .fb_fillrect    = auok190xfb_fillrect,
    .fb_copyarea    = auok190xfb_copyarea,
    .fb_imageblit   = auok190xfb_imageblit,
    .fb_check_var   = auok190xfb_check_var,
};

/*
 * Controller-functions common to both K1900 and K1901
 */

static int auok190x_read_temperature(struct auok190xfb_par *par)
{
    struct device *dev = par->info->device;
    u16 data[4];
    int temp;

    pm_runtime_get_sync(dev);

    mutex_lock(&(par->io_lock));

    auok190x_read_cmdargs(par, AUOK190X_CMD_READ_VERSION, 4, data);

    mutex_unlock(&(par->io_lock));

    pm_runtime_mark_last_busy(dev);
    pm_runtime_put_autosuspend(dev);

    /* sanitize and split of half-degrees for now */
    temp = ((data[0] & AUOK190X_VERSION_TEMP_MASK) >> 1);

    /* handle positive and negative temperatures */
    if (temp >= 201)
        return (255 - temp + 1) * (-1);
    else
        return temp;
}

static void auok190x_identify(struct auok190xfb_par *par)
{
    struct device *dev = par->info->device;
    u16 data[4];

    pm_runtime_get_sync(dev);

    mutex_lock(&(par->io_lock));

    auok190x_read_cmdargs(par, AUOK190X_CMD_READ_VERSION, 4, data);

    mutex_unlock(&(par->io_lock));

    par->epd_type = data[1] & AUOK190X_VERSION_TEMP_MASK;

    par->panel_size_int = AUOK190X_VERSION_SIZE_INT(data[2]);
    par->panel_size_float = AUOK190X_VERSION_SIZE_FLOAT(data[2]);
    par->panel_model = AUOK190X_VERSION_MODEL(data[2]);

    par->tcon_version = AUOK190X_VERSION_TCON(data[3]);
    par->lut_version = AUOK190X_VERSION_LUT(data[3]);

    dev_dbg(dev, "panel %d.%din, model 0x%x, EPD 0x%x TCON-rev 0x%x, LUT-rev 0x%x",
        par->panel_size_int, par->panel_size_float, par->panel_model,
        par->epd_type, par->tcon_version, par->lut_version);

    pm_runtime_mark_last_busy(dev);
    pm_runtime_put_autosuspend(dev);
}

/*
 * Sysfs functions
 */

static ssize_t update_mode_show(struct device *dev,
                struct device_attribute *attr, char *buf)
{
    struct fb_info *info = dev_get_drvdata(dev);
    struct auok190xfb_par *par = info->par;

    return sprintf(buf, "%d\n", par->update_mode);
}

static ssize_t update_mode_store(struct device *dev,
                 struct device_attribute *attr,
                 const char *buf, size_t count)
{
    struct fb_info *info = dev_get_drvdata(dev);
    struct auok190xfb_par *par = info->par;
    int mode, ret;

    ret = kstrtoint(buf, 10, &mode);
    if (ret)
        return ret;

    par->update_mode = mode;

    /* if we enter a better mode, do a full update */
    if (par->last_mode > 1 && mode < par->last_mode)
        par->update_all(par);

    return count;
}

static ssize_t flash_show(struct device *dev, struct device_attribute *attr,
              char *buf)
{
    struct fb_info *info = dev_get_drvdata(dev);
    struct auok190xfb_par *par = info->par;

    return sprintf(buf, "%d\n", par->flash);
}

static ssize_t flash_store(struct device *dev, struct device_attribute *attr,
               const char *buf, size_t count)
{
    struct fb_info *info = dev_get_drvdata(dev);
    struct auok190xfb_par *par = info->par;
    int flash, ret;

    ret = kstrtoint(buf, 10, &flash);
    if (ret)
        return ret;

    if (flash > 0)
        par->flash = 1;
    else
        par->flash = 0;

    return count;
}

static ssize_t temp_show(struct device *dev, struct device_attribute *attr,
             char *buf)
{
    struct fb_info *info = dev_get_drvdata(dev);
    struct auok190xfb_par *par = info->par;
    int temp;

    temp = auok190x_read_temperature(par);
    return sprintf(buf, "%d\n", temp);
}

static DEVICE_ATTR(update_mode, 0644, update_mode_show, update_mode_store);
static DEVICE_ATTR(flash, 0644, flash_show, flash_store);
static DEVICE_ATTR(temp, 0644, temp_show, NULL);

static struct attribute *auok190x_attributes[] = {
    &dev_attr_update_mode.attr,
    &dev_attr_flash.attr,
    &dev_attr_temp.attr,
    NULL
};

static const struct attribute_group auok190x_attr_group = {
    .attrs      = auok190x_attributes,
};

static int auok190x_power(struct auok190xfb_par *par, bool on)
{
    struct auok190x_board *board = par->board;
    int ret;

    if (on) {
        /* We should maintain POWER up for at least 80ms before set
         * RST_N and SLP_N to high (TCON spec 20100803_v35 p59)
         */
        ret = regulator_enable(par->regulator);
        if (ret)
            return ret;

        msleep(200);
        gpio_set_value(board->gpio_nrst, 1);
        gpio_set_value(board->gpio_nsleep, 1);
        msleep(200);
    } else {
        regulator_disable(par->regulator);
        gpio_set_value(board->gpio_nrst, 0);
        gpio_set_value(board->gpio_nsleep, 0);
    }

    return 0;
}

/*
 * Recovery - powercycle the controller
 */

static void auok190x_recover(struct auok190xfb_par *par)
{
    auok190x_power(par, 0);
    msleep(100);
    auok190x_power(par, 1);

    par->init(par);

    /* wait for init to complete */
    par->board->wait_for_rdy(par);
}

/*
 * Power-management
 */

#ifdef CONFIG_PM
static int auok190x_runtime_suspend(struct device *dev)
{
    struct platform_device *pdev = to_platform_device(dev);
    struct fb_info *info = platform_get_drvdata(pdev);
    struct auok190xfb_par *par = info->par;
    struct auok190x_board *board = par->board;
    u16 standby_param;

    /* take and keep the lock until we are resumed, as the controller
     * will never reach the non-busy state when in standby mode
     */
    mutex_lock(&(par->io_lock));

    if (par->standby) {
        dev_warn(dev, "already in standby, runtime-pm pairing mismatch\n");
        mutex_unlock(&(par->io_lock));
        return 0;
    }

    /* according to runtime_pm.txt runtime_suspend only means, that the
     * device will not process data and will not communicate with the CPU
     * As we hold the lock, this stays true even without standby
     */
    if (board->quirks & AUOK190X_QUIRK_STANDBYBROKEN) {
        dev_dbg(dev, "runtime suspend without standby\n");
        goto finish;
    } else if (board->quirks & AUOK190X_QUIRK_STANDBYPARAM) {
        /* for some TCON versions STANDBY expects a parameter (0) but
         * it seems the real tcon version has to be determined yet.
         */
        dev_dbg(dev, "runtime suspend with additional empty param\n");
        standby_param = 0;
        auok190x_send_cmdargs(par, AUOK190X_CMD_STANDBY, 1,
                      &standby_param);
    } else {
        dev_dbg(dev, "runtime suspend without param\n");
        auok190x_send_command(par, AUOK190X_CMD_STANDBY);
    }

    msleep(64);

finish:
    par->standby = 1;

    return 0;
}

static int auok190x_runtime_resume(struct device *dev)
{
    struct platform_device *pdev = to_platform_device(dev);
    struct fb_info *info = platform_get_drvdata(pdev);
    struct auok190xfb_par *par = info->par;
    struct auok190x_board *board = par->board;

    if (!par->standby) {
        dev_warn(dev, "not in standby, runtime-pm pairing mismatch\n");
        return 0;
    }

    if (board->quirks & AUOK190X_QUIRK_STANDBYBROKEN) {
        dev_dbg(dev, "runtime resume without standby\n");
    } else {
        /* when in standby, controller is always busy
         * and only accepts the wakeup command
         */
        dev_dbg(dev, "runtime resume from standby\n");
        auok190x_send_command_nowait(par, AUOK190X_CMD_WAKEUP);

        msleep(160);

        /* wait for the controller to be ready and release the lock */
        board->wait_for_rdy(par);
    }

    par->standby = 0;

    mutex_unlock(&(par->io_lock));

    return 0;
}

static int auok190x_suspend(struct device *dev)
{
    struct platform_device *pdev = to_platform_device(dev);
    struct fb_info *info = platform_get_drvdata(pdev);
    struct auok190xfb_par *par = info->par;
    struct auok190x_board *board = par->board;
    int ret;

    dev_dbg(dev, "suspend\n");
    if (board->quirks & AUOK190X_QUIRK_STANDBYBROKEN) {
        /* suspend via powering off the ic */
        dev_dbg(dev, "suspend with broken standby\n");

        auok190x_power(par, 0);
    } else {
        dev_dbg(dev, "suspend using sleep\n");

        /* the sleep state can only be entered from the standby state.
         * pm_runtime_get_noresume gets called before the suspend call.
         * So the devices usage count is >0 but it is not necessarily
         * active.
         */
        if (!pm_runtime_status_suspended(dev)) {
            ret = auok190x_runtime_suspend(dev);
            if (ret < 0) {
                dev_err(dev, "auok190x_runtime_suspend failed with %d\n",
                    ret);
                return ret;
            }
            par->manual_standby = 1;
        }

        gpio_direction_output(board->gpio_nsleep, 0);
    }

    msleep(100);

    return 0;
}

static int auok190x_resume(struct device *dev)
{
    struct platform_device *pdev = to_platform_device(dev);
    struct fb_info *info = platform_get_drvdata(pdev);
    struct auok190xfb_par *par = info->par;
    struct auok190x_board *board = par->board;

    dev_dbg(dev, "resume\n");
    if (board->quirks & AUOK190X_QUIRK_STANDBYBROKEN) {
        dev_dbg(dev, "resume with broken standby\n");

        auok190x_power(par, 1);

        par->init(par);
    } else {
        dev_dbg(dev, "resume from sleep\n");

        /* device should be in runtime suspend when we were suspended
         * and pm_runtime_put_sync gets called after this function.
         * So there is no need to touch the standby mode here at all.
         */
        gpio_direction_output(board->gpio_nsleep, 1);
        msleep(100);

        /* an additional init call seems to be necessary after sleep */
        auok190x_runtime_resume(dev);
        par->init(par);

        /* if we were runtime-suspended before, suspend again*/
        if (!par->manual_standby)
            auok190x_runtime_suspend(dev);
        else
            par->manual_standby = 0;
    }

    return 0;
}
#endif

const struct dev_pm_ops auok190x_pm = {
    SET_RUNTIME_PM_OPS(auok190x_runtime_suspend, auok190x_runtime_resume,
               NULL)
    SET_SYSTEM_SLEEP_PM_OPS(auok190x_suspend, auok190x_resume)
};
EXPORT_SYMBOL_GPL(auok190x_pm);

/*
 * Common probe and remove code
 */

int __devinit auok190x_common_probe(struct platform_device *pdev,
                    struct auok190x_init_data *init)
{
    struct auok190x_board *board = init->board;
    struct auok190xfb_par *par;
    struct fb_info *info;
    struct panel_info *panel;
    int videomemorysize, ret;
    unsigned char *videomemory;

    /* check board contents */
    if (!board->init || !board->cleanup || !board->wait_for_rdy
        || !board->set_ctl || !board->set_hdb || !board->get_hdb
        || !board->setup_irq)
        return -EINVAL;

    info = framebuffer_alloc(sizeof(struct auok190xfb_par), &pdev->dev);
    if (!info)
        return -ENOMEM;

    par = info->par;
    par->info = info;
    par->board = board;
    par->recover = auok190x_recover;
    par->update_partial = init->update_partial;
    par->update_all = init->update_all;
    par->need_refresh = init->need_refresh;
    par->init = init->init;

    /* init update modes */
    par->update_cnt = 0;
    par->update_mode = -1;
    par->last_mode = -1;
    par->flash = 0;

    par->regulator = regulator_get(info->device, "vdd");
    if (IS_ERR(par->regulator)) {
        ret = PTR_ERR(par->regulator);
        dev_err(info->device, "Failed to get regulator: %d\n", ret);
        goto err_reg;
    }

    ret = board->init(par);
    if (ret) {
        dev_err(info->device, "board init failed, %d\n", ret);
        goto err_board;
    }

    ret = gpio_request(board->gpio_nsleep, "AUOK190x sleep");
    if (ret) {
        dev_err(info->device, "could not request sleep gpio, %d\n",
            ret);
        goto err_gpio1;
    }

    ret = gpio_direction_output(board->gpio_nsleep, 0);
    if (ret) {
        dev_err(info->device, "could not set sleep gpio, %d\n", ret);
        goto err_gpio2;
    }

    ret = gpio_request(board->gpio_nrst, "AUOK190x reset");
    if (ret) {
        dev_err(info->device, "could not request reset gpio, %d\n",
            ret);
        goto err_gpio2;
    }

    ret = gpio_direction_output(board->gpio_nrst, 0);
    if (ret) {
        dev_err(info->device, "could not set reset gpio, %d\n", ret);
        goto err_gpio3;
    }

    ret = auok190x_power(par, 1);
    if (ret) {
        dev_err(info->device, "could not power on the device, %d\n",
            ret);
        goto err_gpio3;
    }

    mutex_init(&par->io_lock);

    init_waitqueue_head(&par->waitq);

    ret = par->board->setup_irq(par->info);
    if (ret) {
        dev_err(info->device, "could not setup ready-irq, %d\n", ret);
        goto err_irq;
    }

    /* wait for init to complete */
    par->board->wait_for_rdy(par);

    /*
     * From here on the controller can talk to us
     */

    /* initialise fix, var, resolution and rotation */

    strlcpy(info->fix.id, init->id, 16);
    info->fix.type = FB_TYPE_PACKED_PIXELS;
    info->fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
    info->fix.xpanstep = 0;
    info->fix.ypanstep = 0;
    info->fix.ywrapstep = 0;
    info->fix.accel = FB_ACCEL_NONE;

    info->var.bits_per_pixel = 8;
    info->var.grayscale = 1;
    info->var.red.length = 8;
    info->var.green.length = 8;
    info->var.blue.length = 8;

    panel = &panel_table[board->resolution];

    /* if 90 degree rotation, switch width and height */
    if (board->rotation & 1) {
        info->var.xres = panel->h;
        info->var.yres = panel->w;
        info->var.xres_virtual = panel->h;
        info->var.yres_virtual = panel->w;
        info->fix.line_length = panel->h;
    } else {
        info->var.xres = panel->w;
        info->var.yres = panel->h;
        info->var.xres_virtual = panel->w;
        info->var.yres_virtual = panel->h;
        info->fix.line_length = panel->w;
    }

    par->resolution = board->resolution;
    par->rotation = board->rotation;

    /* videomemory handling */

    videomemorysize = roundup((panel->w * panel->h), PAGE_SIZE);
    videomemory = vmalloc(videomemorysize);
    if (!videomemory) {
        ret = -ENOMEM;
        goto err_irq;
    }

    memset(videomemory, 0, videomemorysize);
    info->screen_base = (char *)videomemory;
    info->fix.smem_len = videomemorysize;

    info->flags = FBINFO_FLAG_DEFAULT | FBINFO_VIRTFB;
    info->fbops = &auok190xfb_ops;

    /* deferred io init */

    info->fbdefio = devm_kzalloc(info->device,
                     sizeof(struct fb_deferred_io),
                     GFP_KERNEL);
    if (!info->fbdefio) {
        dev_err(info->device, "Failed to allocate memory\n");
        ret = -ENOMEM;
        goto err_defio;
    }

    dev_dbg(info->device, "targetting %d frames per second\n", board->fps);
    info->fbdefio->delay = HZ / board->fps;
    info->fbdefio->first_io = auok190xfb_dpy_first_io,
    info->fbdefio->deferred_io = auok190xfb_dpy_deferred_io,
    fb_deferred_io_init(info);

    /* color map */

    ret = fb_alloc_cmap(&info->cmap, 256, 0);
    if (ret < 0) {
        dev_err(info->device, "Failed to allocate colormap\n");
        goto err_cmap;
    }

    /* controller init */

    par->consecutive_threshold = 100;
    par->init(par);
    auok190x_identify(par);

    platform_set_drvdata(pdev, info);

    ret = register_framebuffer(info);
    if (ret < 0)
        goto err_regfb;

    ret = sysfs_create_group(&info->device->kobj, &auok190x_attr_group);
    if (ret)
        goto err_sysfs;

    dev_info(info->device, "fb%d: %dx%d using %dK of video memory\n",
         info->node, info->var.xres, info->var.yres,
         videomemorysize >> 10);

    /* increase autosuspend_delay when we use alternative methods
     * for runtime_pm
     */
    par->autosuspend_delay = (board->quirks & AUOK190X_QUIRK_STANDBYBROKEN)
                    ? 1000 : 200;

    pm_runtime_set_active(info->device);
    pm_runtime_enable(info->device);
    pm_runtime_set_autosuspend_delay(info->device, par->autosuspend_delay);
    pm_runtime_use_autosuspend(info->device);

    return 0;

err_sysfs:
    unregister_framebuffer(info);
err_regfb:
    fb_dealloc_cmap(&info->cmap);
err_cmap:
    fb_deferred_io_cleanup(info);
err_defio:
    vfree((void *)info->screen_base);
err_irq:
    auok190x_power(par, 0);
err_gpio3:
    gpio_free(board->gpio_nrst);
err_gpio2:
    gpio_free(board->gpio_nsleep);
err_gpio1:
    board->cleanup(par);
err_board:
    regulator_put(par->regulator);
err_reg:
    framebuffer_release(info);

    return ret;
}
EXPORT_SYMBOL_GPL(auok190x_common_probe);

int  __devexit auok190x_common_remove(struct platform_device *pdev)
{
    struct fb_info *info = platform_get_drvdata(pdev);
    struct auok190xfb_par *par = info->par;
    struct auok190x_board *board = par->board;

    pm_runtime_disable(info->device);

    sysfs_remove_group(&info->device->kobj, &auok190x_attr_group);

    unregister_framebuffer(info);

    fb_dealloc_cmap(&info->cmap);

    fb_deferred_io_cleanup(info);

    vfree((void *)info->screen_base);

    auok190x_power(par, 0);

    gpio_free(board->gpio_nrst);
    gpio_free(board->gpio_nsleep);

    board->cleanup(par);

    regulator_put(par->regulator);

    framebuffer_release(info);

    return 0;
}
EXPORT_SYMBOL_GPL(auok190x_common_remove);

MODULE_DESCRIPTION("Common code for AUO-K190X controllers");
MODULE_AUTHOR("Heiko Stuebner <[email protected]>");
MODULE_LICENSE("GPL");