// SPDX-License-Identifier: GPL-2.0-only
/*
 * LCD panel driver for Sharp LS037V7DW01
 *
 * Copyright (C) 2013 Texas Instruments
 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
 */

#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/regulator/consumer.h>
#include <video/omapfb_dss.h>

struct panel_drv_data {
        struct omap_dss_device dssdev;
        struct omap_dss_device *in;
        struct regulator *vcc;

        int data_lines;

        struct omap_video_timings videomode;

        struct gpio_desc *resb_gpio;    /* low = reset active min 20 us */
        struct gpio_desc *ini_gpio;     /* high = power on */
        struct gpio_desc *mo_gpio;      /* low = 480x640, high = 240x320 */
        struct gpio_desc *lr_gpio;      /* high = conventional horizontal scanning */
        struct gpio_desc *ud_gpio;      /* high = conventional vertical scanning */
};

static const struct omap_video_timings sharp_ls_timings = {
        .x_res = 480,
        .y_res = 640,

        .pixelclock     = 19200000,

        .hsw            = 2,
        .hfp            = 1,
        .hbp            = 28,

        .vsw            = 1,
        .vfp            = 1,
        .vbp            = 1,

        .vsync_level    = OMAPDSS_SIG_ACTIVE_LOW,
        .hsync_level    = OMAPDSS_SIG_ACTIVE_LOW,
        .data_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE,
        .de_level       = OMAPDSS_SIG_ACTIVE_HIGH,
        .sync_pclk_edge = OMAPDSS_DRIVE_SIG_FALLING_EDGE,
};

#define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)

static int sharp_ls_connect(struct omap_dss_device *dssdev)
{
        struct panel_drv_data *ddata = to_panel_data(dssdev);
        struct omap_dss_device *in = ddata->in;

        if (omapdss_device_is_connected(dssdev))
                return 0;

        return in->ops.dpi->connect(in, dssdev);
}

static void sharp_ls_disconnect(struct omap_dss_device *dssdev)
{
        struct panel_drv_data *ddata = to_panel_data(dssdev);
        struct omap_dss_device *in = ddata->in;

        if (!omapdss_device_is_connected(dssdev))
                return;

        in->ops.dpi->disconnect(in, dssdev);
}

static int sharp_ls_enable(struct omap_dss_device *dssdev)
{
        struct panel_drv_data *ddata = to_panel_data(dssdev);
        struct omap_dss_device *in = ddata->in;
        int r;

        if (!omapdss_device_is_connected(dssdev))
                return -ENODEV;

        if (omapdss_device_is_enabled(dssdev))
                return 0;

        if (ddata->data_lines)
                in->ops.dpi->set_data_lines(in, ddata->data_lines);
        in->ops.dpi->set_timings(in, &ddata->videomode);

        if (ddata->vcc) {
                r = regulator_enable(ddata->vcc);
                if (r != 0)
                        return r;
        }

        r = in->ops.dpi->enable(in);
        if (r) {
                regulator_disable(ddata->vcc);
                return r;
        }

        /* wait couple of vsyncs until enabling the LCD */
        msleep(50);

        if (ddata->resb_gpio)
                gpiod_set_value_cansleep(ddata->resb_gpio, 1);

        if (ddata->ini_gpio)
                gpiod_set_value_cansleep(ddata->ini_gpio, 1);

        dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;

        return 0;
}

static void sharp_ls_disable(struct omap_dss_device *dssdev)
{
        struct panel_drv_data *ddata = to_panel_data(dssdev);
        struct omap_dss_device *in = ddata->in;

        if (!omapdss_device_is_enabled(dssdev))
                return;

        if (ddata->ini_gpio)
                gpiod_set_value_cansleep(ddata->ini_gpio, 0);

        if (ddata->resb_gpio)
                gpiod_set_value_cansleep(ddata->resb_gpio, 0);

        /* wait at least 5 vsyncs after disabling the LCD */

        msleep(100);

        in->ops.dpi->disable(in);

        if (ddata->vcc)
                regulator_disable(ddata->vcc);

        dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
}

static void sharp_ls_set_timings(struct omap_dss_device *dssdev,
                struct omap_video_timings *timings)
{
        struct panel_drv_data *ddata = to_panel_data(dssdev);
        struct omap_dss_device *in = ddata->in;

        ddata->videomode = *timings;
        dssdev->panel.timings = *timings;

        in->ops.dpi->set_timings(in, timings);
}

static void sharp_ls_get_timings(struct omap_dss_device *dssdev,
                struct omap_video_timings *timings)
{
        struct panel_drv_data *ddata = to_panel_data(dssdev);

        *timings = ddata->videomode;
}

static int sharp_ls_check_timings(struct omap_dss_device *dssdev,
                struct omap_video_timings *timings)
{
        struct panel_drv_data *ddata = to_panel_data(dssdev);
        struct omap_dss_device *in = ddata->in;

        return in->ops.dpi->check_timings(in, timings);
}

static struct omap_dss_driver sharp_ls_ops = {
        .connect        = sharp_ls_connect,
        .disconnect     = sharp_ls_disconnect,

        .enable         = sharp_ls_enable,
        .disable        = sharp_ls_disable,

        .set_timings    = sharp_ls_set_timings,
        .get_timings    = sharp_ls_get_timings,
        .check_timings  = sharp_ls_check_timings,

        .get_resolution = omapdss_default_get_resolution,
};

static  int sharp_ls_get_gpio_of(struct device *dev, int index, int val,
        const char *desc, struct gpio_desc **gpiod)
{
        struct gpio_desc *gd;

        *gpiod = NULL;

        gd = devm_gpiod_get_index(dev, desc, index, GPIOD_OUT_LOW);
        if (IS_ERR(gd))
                return PTR_ERR(gd);

        *gpiod = gd;
        return 0;
}

static int sharp_ls_probe_of(struct platform_device *pdev)
{
        struct panel_drv_data *ddata = platform_get_drvdata(pdev);
        struct device_node *node = pdev->dev.of_node;
        struct omap_dss_device *in;
        int r;

        ddata->vcc = devm_regulator_get(&pdev->dev, "envdd");
        if (IS_ERR(ddata->vcc))
                return dev_err_probe(&pdev->dev, PTR_ERR(ddata->vcc),
                                     "failed to get regulator\n");

        /* lcd INI */
        r = sharp_ls_get_gpio_of(&pdev->dev, 0, 0, "enable", &ddata->ini_gpio);
        if (r)
                return r;

        /* lcd RESB */
        r = sharp_ls_get_gpio_of(&pdev->dev, 0, 0, "reset", &ddata->resb_gpio);
        if (r)
                return r;

        /* lcd MO */
        r = sharp_ls_get_gpio_of(&pdev->dev, 0, 0, "mode", &ddata->mo_gpio);
        if (r)
                return r;

        /* lcd LR */
        r = sharp_ls_get_gpio_of(&pdev->dev, 1, 1, "mode", &ddata->lr_gpio);
        if (r)
                return r;

        /* lcd UD */
        r = sharp_ls_get_gpio_of(&pdev->dev, 2, 1, "mode", &ddata->ud_gpio);
        if (r)
                return r;

        in = omapdss_of_find_source_for_first_ep(node);
        if (IS_ERR(in)) {
                dev_err(&pdev->dev, "failed to find video source\n");
                return PTR_ERR(in);
        }

        ddata->in = in;

        return 0;
}

static int sharp_ls_probe(struct platform_device *pdev)
{
        struct panel_drv_data *ddata;
        struct omap_dss_device *dssdev;
        int r;

        if (!pdev->dev.of_node)
                return -ENODEV;

        ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
        if (ddata == NULL)
                return -ENOMEM;

        platform_set_drvdata(pdev, ddata);

        r = sharp_ls_probe_of(pdev);
        if (r)
                return r;

        ddata->videomode = sharp_ls_timings;

        dssdev = &ddata->dssdev;
        dssdev->dev = &pdev->dev;
        dssdev->driver = &sharp_ls_ops;
        dssdev->type = OMAP_DISPLAY_TYPE_DPI;
        dssdev->owner = THIS_MODULE;
        dssdev->panel.timings = ddata->videomode;
        dssdev->phy.dpi.data_lines = ddata->data_lines;

        r = omapdss_register_display(dssdev);
        if (r) {
                dev_err(&pdev->dev, "Failed to register panel\n");
                goto err_reg;
        }

        return 0;

err_reg:
        omap_dss_put_device(ddata->in);
        return r;
}

static void sharp_ls_remove(struct platform_device *pdev)
{
        struct panel_drv_data *ddata = platform_get_drvdata(pdev);
        struct omap_dss_device *dssdev = &ddata->dssdev;
        struct omap_dss_device *in = ddata->in;

        omapdss_unregister_display(dssdev);

        sharp_ls_disable(dssdev);
        sharp_ls_disconnect(dssdev);

        omap_dss_put_device(in);
}

static const struct of_device_id sharp_ls_of_match[] = {
        { .compatible = "omapdss,sharp,ls037v7dw01", },
        {},
};

MODULE_DEVICE_TABLE(of, sharp_ls_of_match);

static struct platform_driver sharp_ls_driver = {
        .probe = sharp_ls_probe,
        .remove = sharp_ls_remove,
        .driver = {
                .name = "panel-sharp-ls037v7dw01",
                .of_match_table = sharp_ls_of_match,
        },
};

module_platform_driver(sharp_ls_driver);

MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
MODULE_DESCRIPTION("Sharp LS037V7DW01 Panel Driver");
MODULE_LICENSE("GPL");