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/*
* LCD panel driver for Sharp LS037V7DW01
*
* Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com/
* Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
*
* 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/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 "../dss/omapdss.h"
struct panel_drv_data {
struct omap_dss_device dssdev;
struct regulator *vcc;
struct videomode vm;
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 videomode sharp_ls_vm = {
.hactive = 480,
.vactive = 640,
.pixelclock = 19200000,
.hsync_len = 2,
.hfront_porch = 1,
.hback_porch = 28,
.vsync_len = 1,
.vfront_porch = 1,
.vback_porch = 1,
.flags = DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_VSYNC_LOW,
};
#define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
static int sharp_ls_connect(struct omap_dss_device *src,
struct omap_dss_device *dst)
{
return 0;
}
static void sharp_ls_disconnect(struct omap_dss_device *src,
struct omap_dss_device *dst)
{
}
static void sharp_ls_pre_enable(struct omap_dss_device *dssdev)
{
struct panel_drv_data *ddata = to_panel_data(dssdev);
int r;
if (ddata->vcc) {
r = regulator_enable(ddata->vcc);
if (r)
dev_err(dssdev->dev, "%s: failed to enable regulator\n",
__func__);
}
}
static void sharp_ls_enable(struct omap_dss_device *dssdev)
{
struct panel_drv_data *ddata = to_panel_data(dssdev);
/* 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);
}
static void sharp_ls_disable(struct omap_dss_device *dssdev)
{
struct panel_drv_data *ddata = to_panel_data(dssdev);
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);
}
static void sharp_ls_post_disable(struct omap_dss_device *dssdev)
{
struct panel_drv_data *ddata = to_panel_data(dssdev);
if (ddata->vcc)
regulator_disable(ddata->vcc);
}
static int sharp_ls_get_modes(struct omap_dss_device *dssdev,
struct drm_connector *connector)
{
struct panel_drv_data *ddata = to_panel_data(dssdev);
return omapdss_display_get_modes(connector, &ddata->vm);
}
static const struct omap_dss_device_ops sharp_ls_ops = {
.connect = sharp_ls_connect,
.disconnect = sharp_ls_disconnect,
.pre_enable = sharp_ls_pre_enable,
.enable = sharp_ls_enable,
.disable = sharp_ls_disable,
.post_disable = sharp_ls_post_disable,
.get_modes = sharp_ls_get_modes,
};
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);
int r;
ddata->vcc = devm_regulator_get(&pdev->dev, "envdd");
if (IS_ERR(ddata->vcc)) {
dev_err(&pdev->dev, "failed to get regulator\n");
return PTR_ERR(ddata->vcc);
}
/* 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;
return 0;
}
static int sharp_ls_probe(struct platform_device *pdev)
{
struct panel_drv_data *ddata;
struct omap_dss_device *dssdev;
int r;
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->vm = sharp_ls_vm;
dssdev = &ddata->dssdev;
dssdev->dev = &pdev->dev;
dssdev->ops = &sharp_ls_ops;
dssdev->type = OMAP_DISPLAY_TYPE_DPI;
dssdev->display = true;
dssdev->owner = THIS_MODULE;
dssdev->of_ports = BIT(0);
dssdev->ops_flags = OMAP_DSS_DEVICE_OP_MODES;
/*
* Note: According to the panel documentation:
* DATA needs to be driven on the FALLING edge
*/
dssdev->bus_flags = DRM_BUS_FLAG_DE_HIGH
| DRM_BUS_FLAG_SYNC_DRIVE_NEGEDGE
| DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE;
omapdss_display_init(dssdev);
omapdss_device_register(dssdev);
return 0;
}
static int __exit sharp_ls_remove(struct platform_device *pdev)
{
struct panel_drv_data *ddata = platform_get_drvdata(pdev);
struct omap_dss_device *dssdev = &ddata->dssdev;
omapdss_device_unregister(dssdev);
if (omapdss_device_is_enabled(dssdev)) {
sharp_ls_disable(dssdev);
sharp_ls_post_disable(dssdev);
}
return 0;
}
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 = __exit_p(sharp_ls_remove),
.driver = {
.name = "panel-sharp-ls037v7dw01",
.of_match_table = sharp_ls_of_match,
.suppress_bind_attrs = true,
},
};
module_platform_driver(sharp_ls_driver);
MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
MODULE_DESCRIPTION("Sharp LS037V7DW01 Panel Driver");
MODULE_LICENSE("GPL");
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