/*
 * linux/drivers/video/omap2/dss/core.c
 *
 * Copyright (C) 2009 Nokia Corporation
 * Author: Tomi Valkeinen <tomi.valkeinen@nokia.com>
 *
 * Some code and ideas taken from drivers/video/omap/ driver
 * by Imre Deak.
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#define DSS_SUBSYS_NAME "CORE"

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/seq_file.h>
#include <linux/debugfs.h>
#include <linux/io.h>
#include <linux/device.h>
#include <linux/regulator/consumer.h>
#include <linux/suspend.h>
#include <linux/slab.h>

#include <video/omapdss.h>

#include "dss.h"
#include "dss_features.h"

static struct {
        struct platform_device *pdev;

        struct regulator *vdds_dsi_reg;
        struct regulator *vdds_sdi_reg;

        const char *default_display_name;
} core;

static char *def_disp_name;
module_param_named(def_disp, def_disp_name, charp, 0);
MODULE_PARM_DESC(def_disp, "default display name");

static bool dss_initialized;

const char *omapdss_get_default_display_name(void)
{
        return core.default_display_name;
}
EXPORT_SYMBOL(omapdss_get_default_display_name);

enum omapdss_version omapdss_get_version(void)
{
        struct omap_dss_board_info *pdata = core.pdev->dev.platform_data;
        return pdata->version;
}
EXPORT_SYMBOL(omapdss_get_version);

bool omapdss_is_initialized(void)
{
        return dss_initialized;
}
EXPORT_SYMBOL(omapdss_is_initialized);

struct platform_device *dss_get_core_pdev(void)
{
        return core.pdev;
}

/* REGULATORS */

struct regulator *dss_get_vdds_dsi(void)
{
        struct regulator *reg;

        if (core.vdds_dsi_reg != NULL)
                return core.vdds_dsi_reg;

        reg = regulator_get(&core.pdev->dev, "vdds_dsi");
        if (!IS_ERR(reg))
                core.vdds_dsi_reg = reg;

        return reg;
}

struct regulator *dss_get_vdds_sdi(void)
{
        struct regulator *reg;

        if (core.vdds_sdi_reg != NULL)
                return core.vdds_sdi_reg;

        reg = regulator_get(&core.pdev->dev, "vdds_sdi");
        if (!IS_ERR(reg))
                core.vdds_sdi_reg = reg;

        return reg;
}

int dss_dsi_enable_pads(int dsi_id, unsigned lane_mask)
{
        struct omap_dss_board_info *board_data = core.pdev->dev.platform_data;

        if (!board_data->dsi_enable_pads)
                return -ENOENT;

        return board_data->dsi_enable_pads(dsi_id, lane_mask);
}

void dss_dsi_disable_pads(int dsi_id, unsigned lane_mask)
{
        struct omap_dss_board_info *board_data = core.pdev->dev.platform_data;

        if (!board_data->dsi_disable_pads)
                return;

        return board_data->dsi_disable_pads(dsi_id, lane_mask);
}

int dss_set_min_bus_tput(struct device *dev, unsigned long tput)
{
        struct omap_dss_board_info *pdata = core.pdev->dev.platform_data;

        if (pdata->set_min_bus_tput)
                return pdata->set_min_bus_tput(dev, tput);
        else
                return 0;
}

#if defined(CONFIG_OMAP2_DSS_DEBUGFS)
static int dss_debug_show(struct seq_file *s, void *unused)
{
        void (*func)(struct seq_file *) = s->private;
        func(s);
        return 0;
}

static int dss_debug_open(struct inode *inode, struct file *file)
{
        return single_open(file, dss_debug_show, inode->i_private);
}

static const struct file_operations dss_debug_fops = {
        .open           = dss_debug_open,
        .read           = seq_read,
        .llseek         = seq_lseek,
        .release        = single_release,
};

static struct dentry *dss_debugfs_dir;

static int dss_initialize_debugfs(void)
{
        dss_debugfs_dir = debugfs_create_dir("omapdss", NULL);
        if (IS_ERR(dss_debugfs_dir)) {
                int err = PTR_ERR(dss_debugfs_dir);
                dss_debugfs_dir = NULL;
                return err;
        }

        debugfs_create_file("clk", S_IRUGO, dss_debugfs_dir,
                        &dss_debug_dump_clocks, &dss_debug_fops);

        return 0;
}

static void dss_uninitialize_debugfs(void)
{
        if (dss_debugfs_dir)
                debugfs_remove_recursive(dss_debugfs_dir);
}

int dss_debugfs_create_file(const char *name, void (*write)(struct seq_file *))
{
        struct dentry *d;

        d = debugfs_create_file(name, S_IRUGO, dss_debugfs_dir,
                        write, &dss_debug_fops);

        return PTR_RET(d);
}
#else /* CONFIG_OMAP2_DSS_DEBUGFS */
static inline int dss_initialize_debugfs(void)
{
        return 0;
}
static inline void dss_uninitialize_debugfs(void)
{
}
int dss_debugfs_create_file(const char *name, void (*write)(struct seq_file *))
{
        return 0;
}
#endif /* CONFIG_OMAP2_DSS_DEBUGFS */

/* PLATFORM DEVICE */
static int omap_dss_pm_notif(struct notifier_block *b, unsigned long v, void *d)
{
        DSSDBG("pm notif %lu\n", v);

        switch (v) {
        case PM_SUSPEND_PREPARE:
                DSSDBG("suspending displays\n");
                return dss_suspend_all_devices();

        case PM_POST_SUSPEND:
                DSSDBG("resuming displays\n");
                return dss_resume_all_devices();

        default:
                return 0;
        }
}

static struct notifier_block omap_dss_pm_notif_block = {
        .notifier_call = omap_dss_pm_notif,
};

static int __init omap_dss_probe(struct platform_device *pdev)
{
        struct omap_dss_board_info *pdata = pdev->dev.platform_data;
        int r;

        core.pdev = pdev;

        dss_features_init(omapdss_get_version());

        r = dss_initialize_debugfs();
        if (r)
                goto err_debugfs;

        if (def_disp_name)
                core.default_display_name = def_disp_name;
        else if (pdata->default_device)
                core.default_display_name = pdata->default_device->name;

        register_pm_notifier(&omap_dss_pm_notif_block);

        return 0;

err_debugfs:

        return r;
}

static int omap_dss_remove(struct platform_device *pdev)
{
        unregister_pm_notifier(&omap_dss_pm_notif_block);

        dss_uninitialize_debugfs();

        return 0;
}

static void omap_dss_shutdown(struct platform_device *pdev)
{
        DSSDBG("shutdown\n");
        dss_disable_all_devices();
}

static struct platform_driver omap_dss_driver = {
        .remove         = omap_dss_remove,
        .shutdown       = omap_dss_shutdown,
        .driver         = {
                .name   = "omapdss",
                .owner  = THIS_MODULE,
        },
};

/* BUS */
static int dss_bus_match(struct device *dev, struct device_driver *driver)
{
        struct omap_dss_device *dssdev = to_dss_device(dev);

        DSSDBG("bus_match. dev %s/%s, drv %s\n",
                        dev_name(dev), dssdev->driver_name, driver->name);

        return strcmp(dssdev->driver_name, driver->name) == 0;
}

static ssize_t device_name_show(struct device *dev,
                struct device_attribute *attr, char *buf)
{
        struct omap_dss_device *dssdev = to_dss_device(dev);
        return snprintf(buf, PAGE_SIZE, "%s\n",
                        dssdev->name ?
                        dssdev->name : "");
}

static struct device_attribute default_dev_attrs[] = {
        __ATTR(name, S_IRUGO, device_name_show, NULL),
        __ATTR_NULL,
};

static ssize_t driver_name_show(struct device_driver *drv, char *buf)
{
        struct omap_dss_driver *dssdrv = to_dss_driver(drv);
        return snprintf(buf, PAGE_SIZE, "%s\n",
                        dssdrv->driver.name ?
                        dssdrv->driver.name : "");
}
static struct driver_attribute default_drv_attrs[] = {
        __ATTR(name, S_IRUGO, driver_name_show, NULL),
        __ATTR_NULL,
};

static struct bus_type dss_bus_type = {
        .name = "omapdss",
        .match = dss_bus_match,
        .dev_attrs = default_dev_attrs,
        .drv_attrs = default_drv_attrs,
};

static void dss_bus_release(struct device *dev)
{
        DSSDBG("bus_release\n");
}

static struct device dss_bus = {
        .release = dss_bus_release,
};

struct bus_type *dss_get_bus(void)
{
        return &dss_bus_type;
}

/* DRIVER */
static int dss_driver_probe(struct device *dev)
{
        int r;
        struct omap_dss_driver *dssdrv = to_dss_driver(dev->driver);
        struct omap_dss_device *dssdev = to_dss_device(dev);

        DSSDBG("driver_probe: dev %s/%s, drv %s\n",
                                dev_name(dev), dssdev->driver_name,
                                dssdrv->driver.name);

        r = dssdrv->probe(dssdev);

        if (r) {
                DSSERR("driver probe failed: %d\n", r);
                return r;
        }

        DSSDBG("probe done for device %s\n", dev_name(dev));

        dssdev->driver = dssdrv;

        return 0;
}

static int dss_driver_remove(struct device *dev)
{
        struct omap_dss_driver *dssdrv = to_dss_driver(dev->driver);
        struct omap_dss_device *dssdev = to_dss_device(dev);

        DSSDBG("driver_remove: dev %s/%s\n", dev_name(dev),
                        dssdev->driver_name);

        dssdrv->remove(dssdev);

        dssdev->driver = NULL;

        return 0;
}

int omap_dss_register_driver(struct omap_dss_driver *dssdriver)
{
        dssdriver->driver.bus = &dss_bus_type;
        dssdriver->driver.probe = dss_driver_probe;
        dssdriver->driver.remove = dss_driver_remove;

        if (dssdriver->get_resolution == NULL)
                dssdriver->get_resolution = omapdss_default_get_resolution;
        if (dssdriver->get_recommended_bpp == NULL)
                dssdriver->get_recommended_bpp =
                        omapdss_default_get_recommended_bpp;
        if (dssdriver->get_timings == NULL)
                dssdriver->get_timings = omapdss_default_get_timings;

        return driver_register(&dssdriver->driver);
}
EXPORT_SYMBOL(omap_dss_register_driver);

void omap_dss_unregister_driver(struct omap_dss_driver *dssdriver)
{
        driver_unregister(&dssdriver->driver);
}
EXPORT_SYMBOL(omap_dss_unregister_driver);

/* DEVICE */

static void omap_dss_dev_release(struct device *dev)
{
        struct omap_dss_device *dssdev = to_dss_device(dev);
        kfree(dssdev);
}

static int disp_num_counter;

struct omap_dss_device *dss_alloc_and_init_device(struct device *parent)
{
        struct omap_dss_device *dssdev;

        dssdev = kzalloc(sizeof(*dssdev), GFP_KERNEL);
        if (!dssdev)
                return NULL;

        dssdev->dev.bus = &dss_bus_type;
        dssdev->dev.parent = parent;
        dssdev->dev.release = omap_dss_dev_release;
        dev_set_name(&dssdev->dev, "display%d", disp_num_counter++);

        device_initialize(&dssdev->dev);

        return dssdev;
}

int dss_add_device(struct omap_dss_device *dssdev)
{
        return device_add(&dssdev->dev);
}

void dss_put_device(struct omap_dss_device *dssdev)
{
        put_device(&dssdev->dev);
}

void dss_unregister_device(struct omap_dss_device *dssdev)
{
        device_unregister(&dssdev->dev);
}

static int dss_unregister_dss_dev(struct device *dev, void *data)
{
        struct omap_dss_device *dssdev = to_dss_device(dev);
        dss_unregister_device(dssdev);
        return 0;
}

void dss_unregister_child_devices(struct device *parent)
{
        device_for_each_child(parent, NULL, dss_unregister_dss_dev);
}

void dss_copy_device_pdata(struct omap_dss_device *dst,
                const struct omap_dss_device *src)
{
        u8 *d = (u8 *)dst;
        u8 *s = (u8 *)src;
        size_t dsize = sizeof(struct device);

        memcpy(d + dsize, s + dsize, sizeof(struct omap_dss_device) - dsize);
}

/* BUS */
static int __init omap_dss_bus_register(void)
{
        int r;

        r = bus_register(&dss_bus_type);
        if (r) {
                DSSERR("bus register failed\n");
                return r;
        }

        dev_set_name(&dss_bus, "omapdss");
        r = device_register(&dss_bus);
        if (r) {
                DSSERR("bus driver register failed\n");
                bus_unregister(&dss_bus_type);
                return r;
        }

        return 0;
}

/* INIT */
static int (*dss_output_drv_reg_funcs[])(void) __initdata = {
#ifdef CONFIG_OMAP2_DSS_DSI
        dsi_init_platform_driver,
#endif
#ifdef CONFIG_OMAP2_DSS_DPI
        dpi_init_platform_driver,
#endif
#ifdef CONFIG_OMAP2_DSS_SDI
        sdi_init_platform_driver,
#endif
#ifdef CONFIG_OMAP2_DSS_RFBI
        rfbi_init_platform_driver,
#endif
#ifdef CONFIG_OMAP2_DSS_VENC
        venc_init_platform_driver,
#endif
#ifdef CONFIG_OMAP4_DSS_HDMI
        hdmi_init_platform_driver,
#endif
};

static void (*dss_output_drv_unreg_funcs[])(void) __exitdata = {
#ifdef CONFIG_OMAP2_DSS_DSI
        dsi_uninit_platform_driver,
#endif
#ifdef CONFIG_OMAP2_DSS_DPI
        dpi_uninit_platform_driver,
#endif
#ifdef CONFIG_OMAP2_DSS_SDI
        sdi_uninit_platform_driver,
#endif
#ifdef CONFIG_OMAP2_DSS_RFBI
        rfbi_uninit_platform_driver,
#endif
#ifdef CONFIG_OMAP2_DSS_VENC
        venc_uninit_platform_driver,
#endif
#ifdef CONFIG_OMAP4_DSS_HDMI
        hdmi_uninit_platform_driver,
#endif
};

static bool dss_output_drv_loaded[ARRAY_SIZE(dss_output_drv_reg_funcs)];

static int __init omap_dss_register_drivers(void)
{
        int r;
        int i;

        r = platform_driver_probe(&omap_dss_driver, omap_dss_probe);
        if (r)
                return r;

        r = dss_init_platform_driver();
        if (r) {
                DSSERR("Failed to initialize DSS platform driver\n");
                goto err_dss;
        }

        r = dispc_init_platform_driver();
        if (r) {
                DSSERR("Failed to initialize dispc platform driver\n");
                goto err_dispc;
        }

        /*
         * It's ok if the output-driver register fails. It happens, for example,
         * when there is no output-device (e.g. SDI for OMAP4).
         */
        for (i = 0; i < ARRAY_SIZE(dss_output_drv_reg_funcs); ++i) {
                r = dss_output_drv_reg_funcs[i]();
                if (r == 0)
                        dss_output_drv_loaded[i] = true;
        }

        return 0;

err_dispc:
        dss_uninit_platform_driver();
err_dss:
        platform_driver_unregister(&omap_dss_driver);

        return r;
}

static void __exit omap_dss_unregister_drivers(void)
{
        int i;

        for (i = 0; i < ARRAY_SIZE(dss_output_drv_unreg_funcs); ++i) {
                if (dss_output_drv_loaded[i])
                        dss_output_drv_unreg_funcs[i]();
        }

        dispc_uninit_platform_driver();
        dss_uninit_platform_driver();

        platform_driver_unregister(&omap_dss_driver);
}

#ifdef CONFIG_OMAP2_DSS_MODULE
static void omap_dss_bus_unregister(void)
{
        device_unregister(&dss_bus);

        bus_unregister(&dss_bus_type);
}

static int __init omap_dss_init(void)
{
        int r;

        r = omap_dss_bus_register();
        if (r)
                return r;

        r = omap_dss_register_drivers();
        if (r) {
                omap_dss_bus_unregister();
                return r;
        }

        dss_initialized = true;

        return 0;
}

static void __exit omap_dss_exit(void)
{
        if (core.vdds_dsi_reg != NULL) {
                regulator_put(core.vdds_dsi_reg);
                core.vdds_dsi_reg = NULL;
        }

        if (core.vdds_sdi_reg != NULL) {
                regulator_put(core.vdds_sdi_reg);
                core.vdds_sdi_reg = NULL;
        }

        omap_dss_unregister_drivers();

        omap_dss_bus_unregister();
}

module_init(omap_dss_init);
module_exit(omap_dss_exit);
#else
static int __init omap_dss_init(void)
{
        return omap_dss_bus_register();
}

static int __init omap_dss_init2(void)
{
        int r;

        r = omap_dss_register_drivers();
        if (r)
                return r;

        dss_initialized = true;

        return 0;
}

core_initcall(omap_dss_init);
device_initcall(omap_dss_init2);
#endif

MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@nokia.com>");
MODULE_DESCRIPTION("OMAP2/3 Display Subsystem");
MODULE_LICENSE("GPL v2");