// SPDX-License-Identifier: GPL-2.0+

/*

* DRM driver for Ilitek ILI9341 panels

*

* Copyright 2018 David Lechner <david@lechnology.com>

*

* Based on mi0283qt.c:

* Copyright 2016 Noralf Trønnes

*/

#include <linux/backlight.h>

#include <linux/delay.h>

#include <linux/gpio/consumer.h>

#include <linux/module.h>

#include <linux/property.h>

#include <linux/spi/spi.h>

#include <drm/drm_fb_helper.h>

#include <drm/drm_gem_framebuffer_helper.h>

#include <drm/drm_modeset_helper.h>

#include <drm/tinydrm/mipi-dbi.h>

#include <drm/tinydrm/tinydrm-helpers.h>

#include <video/mipi_display.h>

#define ILI9341_FRMCTR1 0xb1

#define ILI9341_DISCTRL 0xb6

#define ILI9341_ETMOD 0xb7

#define ILI9341_PWCTRL1 0xc0

#define ILI9341_PWCTRL2 0xc1

#define ILI9341_VMCTRL1 0xc5

#define ILI9341_VMCTRL2 0xc7

#define ILI9341_PWCTRLA 0xcb

#define ILI9341_PWCTRLB 0xcf

#define ILI9341_PGAMCTRL 0xe0

#define ILI9341_NGAMCTRL 0xe1

#define ILI9341_DTCTRLA 0xe8

#define ILI9341_DTCTRLB 0xea

#define ILI9341_PWRSEQ 0xed

#define ILI9341_EN3GAM 0xf2

#define ILI9341_PUMPCTRL 0xf7

#define ILI9341_MADCTL_BGR BIT(3)

#define ILI9341_MADCTL_MV BIT(5)

#define ILI9341_MADCTL_MX BIT(6)

#define ILI9341_MADCTL_MY BIT(7)

static void yx240qv29_enable(struct drm_simple_display_pipe *pipe,

struct drm_crtc_state *crtc_state,

struct drm_plane_state *plane_state)

{

struct tinydrm_device *tdev = pipe_to_tinydrm(pipe);

struct mipi_dbi *mipi = mipi_dbi_from_tinydrm(tdev);

u8 addr_mode;

int ret;

DRM_DEBUG_KMS("\n");

ret = mipi_dbi_poweron_conditional_reset(mipi);

if (ret < 0)

return;

if (ret == 1)

goto out_enable;

mipi_dbi_command(mipi, MIPI_DCS_SET_DISPLAY_OFF);

mipi_dbi_command(mipi, ILI9341_PWCTRLB, 0x00, 0xc1, 0x30);

mipi_dbi_command(mipi, ILI9341_PWRSEQ, 0x64, 0x03, 0x12, 0x81);

mipi_dbi_command(mipi, ILI9341_DTCTRLA, 0x85, 0x00, 0x78);

mipi_dbi_command(mipi, ILI9341_PWCTRLA, 0x39, 0x2c, 0x00, 0x34, 0x02);

mipi_dbi_command(mipi, ILI9341_PUMPCTRL, 0x20);

mipi_dbi_command(mipi, ILI9341_DTCTRLB, 0x00, 0x00);

/* Power Control */

mipi_dbi_command(mipi, ILI9341_PWCTRL1, 0x23);

mipi_dbi_command(mipi, ILI9341_PWCTRL2, 0x10);

/* VCOM */

mipi_dbi_command(mipi, ILI9341_VMCTRL1, 0x3e, 0x28);

mipi_dbi_command(mipi, ILI9341_VMCTRL2, 0x86);

/* Memory Access Control */

mipi_dbi_command(mipi, MIPI_DCS_SET_PIXEL_FORMAT, MIPI_DCS_PIXEL_FMT_16BIT);

/* Frame Rate */

mipi_dbi_command(mipi, ILI9341_FRMCTR1, 0x00, 0x1b);

/* Gamma */

mipi_dbi_command(mipi, ILI9341_EN3GAM, 0x00);

mipi_dbi_command(mipi, MIPI_DCS_SET_GAMMA_CURVE, 0x01);

mipi_dbi_command(mipi, ILI9341_PGAMCTRL,

0x0f, 0x31, 0x2b, 0x0c, 0x0e, 0x08, 0x4e, 0xf1,

0x37, 0x07, 0x10, 0x03, 0x0e, 0x09, 0x00);

mipi_dbi_command(mipi, ILI9341_NGAMCTRL,

0x00, 0x0e, 0x14, 0x03, 0x11, 0x07, 0x31, 0xc1,

0x48, 0x08, 0x0f, 0x0c, 0x31, 0x36, 0x0f);

/* DDRAM */

mipi_dbi_command(mipi, ILI9341_ETMOD, 0x07);

/* Display */

mipi_dbi_command(mipi, ILI9341_DISCTRL, 0x08, 0x82, 0x27, 0x00);

mipi_dbi_command(mipi, MIPI_DCS_EXIT_SLEEP_MODE);

msleep(100);

mipi_dbi_command(mipi, MIPI_DCS_SET_DISPLAY_ON);

msleep(100);

out_enable:

switch (mipi->rotation) {

default:

addr_mode = ILI9341_MADCTL_MX;

break;

case 90:

addr_mode = ILI9341_MADCTL_MV;

break;

case 180:

addr_mode = ILI9341_MADCTL_MY;

break;

case 270:

addr_mode = ILI9341_MADCTL_MV | ILI9341_MADCTL_MY |

ILI9341_MADCTL_MX;

break;

}

addr_mode |= ILI9341_MADCTL_BGR;

mipi_dbi_command(mipi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);

mipi_dbi_enable_flush(mipi, crtc_state, plane_state);

}

static const struct drm_simple_display_pipe_funcs ili9341_pipe_funcs = {

.enable = yx240qv29_enable,

.disable = mipi_dbi_pipe_disable,

.update = tinydrm_display_pipe_update,

.prepare_fb = drm_gem_fb_simple_display_pipe_prepare_fb,

};

static const struct drm_display_mode yx240qv29_mode = {

TINYDRM_MODE(240, 320, 37, 49),

};

DEFINE_DRM_GEM_CMA_FOPS(ili9341_fops);

static struct drm_driver ili9341_driver = {

.driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME | DRIVER_ATOMIC,

.fops = &ili9341_fops,

TINYDRM_GEM_DRIVER_OPS,

.debugfs_init = mipi_dbi_debugfs_init,

.name = "ili9341",

.desc = "Ilitek ILI9341",

.date = "20180514",

.major = 1,

.minor = 0,

};

static const struct of_device_id ili9341_of_match[] = {

{ .compatible = "adafruit,yx240qv29" },

{ }

};

MODULE_DEVICE_TABLE(of, ili9341_of_match);

static const struct spi_device_id ili9341_id[] = {

{ "yx240qv29", 0 },

{ }

};

MODULE_DEVICE_TABLE(spi, ili9341_id);

static int ili9341_probe(struct spi_device *spi)

{

struct device *dev = &spi->dev;

struct mipi_dbi *mipi;

struct gpio_desc *dc;

u32 rotation = 0;

int ret;

mipi = devm_kzalloc(dev, sizeof(*mipi), GFP_KERNEL);

if (!mipi)

return -ENOMEM;

mipi->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);

if (IS_ERR(mipi->reset)) {

DRM_DEV_ERROR(dev, "Failed to get gpio 'reset'\n");

return PTR_ERR(mipi->reset);

}

dc = devm_gpiod_get_optional(dev, "dc", GPIOD_OUT_LOW);

if (IS_ERR(dc)) {

DRM_DEV_ERROR(dev, "Failed to get gpio 'dc'\n");

return PTR_ERR(dc);

}

mipi->backlight = devm_of_find_backlight(dev);

if (IS_ERR(mipi->backlight))

return PTR_ERR(mipi->backlight);

device_property_read_u32(dev, "rotation", &rotation);

ret = mipi_dbi_spi_init(spi, mipi, dc);

if (ret)

return ret;

ret = mipi_dbi_init(&spi->dev, mipi, &ili9341_pipe_funcs,

&ili9341_driver, &yx240qv29_mode, rotation);

if (ret)

return ret;

spi_set_drvdata(spi, mipi);

return devm_tinydrm_register(&mipi->tinydrm);

}

static void ili9341_shutdown(struct spi_device *spi)

{

struct mipi_dbi *mipi = spi_get_drvdata(spi);

tinydrm_shutdown(&mipi->tinydrm);

}

static struct spi_driver ili9341_spi_driver = {

.driver = {

.name = "ili9341",

.of_match_table = ili9341_of_match,

},

.id_table = ili9341_id,

.probe = ili9341_probe,

.shutdown = ili9341_shutdown,

};

module_spi_driver(ili9341_spi_driver);

MODULE_DESCRIPTION("Ilitek ILI9341 DRM driver");

MODULE_AUTHOR("David Lechner <david@lechnology.com>");

MODULE_LICENSE("GPL");