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// SPDX-License-Identifier: GPL-2.0
/*
* Sharp LS037V7DW01 LCD Panel Driver
*
* Copyright (C) 2019 Texas Instruments Incorporated
*
* Based on the omapdrm-specific panel-sharp-ls037v7dw01 driver
*
* Copyright (C) 2013 Texas Instruments Incorporated
* 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/regulator/consumer.h>
#include <drm/drm_connector.h>
#include <drm/drm_modes.h>
#include <drm/drm_panel.h>
struct ls037v7dw01_panel {
struct drm_panel panel;
struct platform_device *pdev;
struct regulator *vdd;
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 */
};
#define to_ls037v7dw01_device(p) \
container_of(p, struct ls037v7dw01_panel, panel)
static int ls037v7dw01_disable(struct drm_panel *panel)
{
struct ls037v7dw01_panel *lcd = to_ls037v7dw01_device(panel);
gpiod_set_value_cansleep(lcd->ini_gpio, 0);
gpiod_set_value_cansleep(lcd->resb_gpio, 0);
/* Wait at least 5 vsyncs after disabling the LCD. */
msleep(100);
return 0;
}
static int ls037v7dw01_unprepare(struct drm_panel *panel)
{
struct ls037v7dw01_panel *lcd = to_ls037v7dw01_device(panel);
regulator_disable(lcd->vdd);
return 0;
}
static int ls037v7dw01_prepare(struct drm_panel *panel)
{
struct ls037v7dw01_panel *lcd = to_ls037v7dw01_device(panel);
int ret;
ret = regulator_enable(lcd->vdd);
if (ret < 0)
dev_err(&lcd->pdev->dev, "%s: failed to enable regulator\n",
__func__);
return ret;
}
static int ls037v7dw01_enable(struct drm_panel *panel)
{
struct ls037v7dw01_panel *lcd = to_ls037v7dw01_device(panel);
/* Wait couple of vsyncs before enabling the LCD. */
msleep(50);
gpiod_set_value_cansleep(lcd->resb_gpio, 1);
gpiod_set_value_cansleep(lcd->ini_gpio, 1);
return 0;
}
static const struct drm_display_mode ls037v7dw01_mode = {
.clock = 19200,
.hdisplay = 480,
.hsync_start = 480 + 1,
.hsync_end = 480 + 1 + 2,
.htotal = 480 + 1 + 2 + 28,
.vdisplay = 640,
.vsync_start = 640 + 1,
.vsync_end = 640 + 1 + 1,
.vtotal = 640 + 1 + 1 + 1,
.type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
.flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
.width_mm = 56,
.height_mm = 75,
};
static int ls037v7dw01_get_modes(struct drm_panel *panel,
struct drm_connector *connector)
{
struct drm_display_mode *mode;
mode = drm_mode_duplicate(connector->dev, &ls037v7dw01_mode);
if (!mode)
return -ENOMEM;
drm_mode_set_name(mode);
drm_mode_probed_add(connector, mode);
connector->display_info.width_mm = ls037v7dw01_mode.width_mm;
connector->display_info.height_mm = ls037v7dw01_mode.height_mm;
/*
* FIXME: According to the datasheet pixel data is sampled on the
* rising edge of the clock, but the code running on the SDP3430
* indicates sampling on the negative edge. This should be tested on a
* real device.
*/
connector->display_info.bus_flags = DRM_BUS_FLAG_DE_HIGH
| DRM_BUS_FLAG_SYNC_SAMPLE_POSEDGE
| DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE;
return 1;
}
static const struct drm_panel_funcs ls037v7dw01_funcs = {
.disable = ls037v7dw01_disable,
.unprepare = ls037v7dw01_unprepare,
.prepare = ls037v7dw01_prepare,
.enable = ls037v7dw01_enable,
.get_modes = ls037v7dw01_get_modes,
};
static int ls037v7dw01_probe(struct platform_device *pdev)
{
struct ls037v7dw01_panel *lcd;
lcd = devm_kzalloc(&pdev->dev, sizeof(*lcd), GFP_KERNEL);
if (!lcd)
return -ENOMEM;
platform_set_drvdata(pdev, lcd);
lcd->pdev = pdev;
lcd->vdd = devm_regulator_get(&pdev->dev, "envdd");
if (IS_ERR(lcd->vdd)) {
dev_err(&pdev->dev, "failed to get regulator\n");
return PTR_ERR(lcd->vdd);
}
lcd->ini_gpio = devm_gpiod_get(&pdev->dev, "enable", GPIOD_OUT_LOW);
if (IS_ERR(lcd->ini_gpio)) {
dev_err(&pdev->dev, "failed to get enable gpio\n");
return PTR_ERR(lcd->ini_gpio);
}
lcd->resb_gpio = devm_gpiod_get(&pdev->dev, "reset", GPIOD_OUT_LOW);
if (IS_ERR(lcd->resb_gpio)) {
dev_err(&pdev->dev, "failed to get reset gpio\n");
return PTR_ERR(lcd->resb_gpio);
}
lcd->mo_gpio = devm_gpiod_get_index(&pdev->dev, "mode", 0,
GPIOD_OUT_LOW);
if (IS_ERR(lcd->mo_gpio)) {
dev_err(&pdev->dev, "failed to get mode[0] gpio\n");
return PTR_ERR(lcd->mo_gpio);
}
lcd->lr_gpio = devm_gpiod_get_index(&pdev->dev, "mode", 1,
GPIOD_OUT_LOW);
if (IS_ERR(lcd->lr_gpio)) {
dev_err(&pdev->dev, "failed to get mode[1] gpio\n");
return PTR_ERR(lcd->lr_gpio);
}
lcd->ud_gpio = devm_gpiod_get_index(&pdev->dev, "mode", 2,
GPIOD_OUT_LOW);
if (IS_ERR(lcd->ud_gpio)) {
dev_err(&pdev->dev, "failed to get mode[2] gpio\n");
return PTR_ERR(lcd->ud_gpio);
}
drm_panel_init(&lcd->panel, &pdev->dev, &ls037v7dw01_funcs,
DRM_MODE_CONNECTOR_DPI);
return drm_panel_add(&lcd->panel);
}
static int ls037v7dw01_remove(struct platform_device *pdev)
{
struct ls037v7dw01_panel *lcd = platform_get_drvdata(pdev);
drm_panel_remove(&lcd->panel);
drm_panel_disable(&lcd->panel);
drm_panel_unprepare(&lcd->panel);
return 0;
}
static const struct of_device_id ls037v7dw01_of_match[] = {
{ .compatible = "sharp,ls037v7dw01", },
{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, ls037v7dw01_of_match);
static struct platform_driver ls037v7dw01_driver = {
.probe = ls037v7dw01_probe,
.remove = ls037v7dw01_remove,
.driver = {
.name = "panel-sharp-ls037v7dw01",
.of_match_table = ls037v7dw01_of_match,
},
};
module_platform_driver(ls037v7dw01_driver);
MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
MODULE_DESCRIPTION("Sharp LS037V7DW01 Panel Driver");
MODULE_LICENSE("GPL");
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