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/*
* DRM driver for Multi-Inno MI0283QT panels
*
* Copyright 2016 Noralf Trønnes
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/backlight.h>
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/property.h>
#include <linux/regulator/consumer.h>
#include <linux/spi/spi.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_drv.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_gem_cma_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 mi0283qt_enable(struct drm_simple_display_pipe *pipe,
struct drm_crtc_state *crtc_state,
struct drm_plane_state *plane_state)
{
struct mipi_dbi *mipi = drm_to_mipi_dbi(pipe->crtc.dev);
u8 addr_mode;
int ret, idx;
if (!drm_dev_enter(pipe->crtc.dev, &idx))
return;
DRM_DEBUG_KMS("\n");
ret = mipi_dbi_poweron_conditional_reset(mipi);
if (ret < 0)
goto out_exit;
if (ret == 1)
goto out_enable;
mipi_dbi_command(mipi, MIPI_DCS_SET_DISPLAY_OFF);
mipi_dbi_command(mipi, ILI9341_PWCTRLB, 0x00, 0x83, 0x30);
mipi_dbi_command(mipi, ILI9341_PWRSEQ, 0x64, 0x03, 0x12, 0x81);
mipi_dbi_command(mipi, ILI9341_DTCTRLA, 0x85, 0x01, 0x79);
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, 0x26);
mipi_dbi_command(mipi, ILI9341_PWCTRL2, 0x11);
/* VCOM */
mipi_dbi_command(mipi, ILI9341_VMCTRL1, 0x35, 0x3e);
mipi_dbi_command(mipi, ILI9341_VMCTRL2, 0xbe);
/* 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, 0x08);
mipi_dbi_command(mipi, MIPI_DCS_SET_GAMMA_CURVE, 0x01);
mipi_dbi_command(mipi, ILI9341_PGAMCTRL,
0x1f, 0x1a, 0x18, 0x0a, 0x0f, 0x06, 0x45, 0x87,
0x32, 0x0a, 0x07, 0x02, 0x07, 0x05, 0x00);
mipi_dbi_command(mipi, ILI9341_NGAMCTRL,
0x00, 0x25, 0x27, 0x05, 0x10, 0x09, 0x3a, 0x78,
0x4d, 0x05, 0x18, 0x0d, 0x38, 0x3a, 0x1f);
/* DDRAM */
mipi_dbi_command(mipi, ILI9341_ETMOD, 0x07);
/* Display */
mipi_dbi_command(mipi, ILI9341_DISCTRL, 0x0a, 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:
/* The PiTFT (ili9340) has a hardware reset circuit that
* resets only on power-on and not on each reboot through
* a gpio like the rpi-display does.
* As a result, we need to always apply the rotation value
* regardless of the display "on/off" state.
*/
switch (mipi->rotation) {
default:
addr_mode = ILI9341_MADCTL_MV | ILI9341_MADCTL_MY |
ILI9341_MADCTL_MX;
break;
case 90:
addr_mode = ILI9341_MADCTL_MY;
break;
case 180:
addr_mode = ILI9341_MADCTL_MV;
break;
case 270:
addr_mode = 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);
out_exit:
drm_dev_exit(idx);
}
static const struct drm_simple_display_pipe_funcs mi0283qt_pipe_funcs = {
.enable = mi0283qt_enable,
.disable = mipi_dbi_pipe_disable,
.update = mipi_dbi_pipe_update,
.prepare_fb = drm_gem_fb_simple_display_pipe_prepare_fb,
};
static const struct drm_display_mode mi0283qt_mode = {
DRM_SIMPLE_MODE(320, 240, 58, 43),
};
DEFINE_DRM_GEM_CMA_FOPS(mi0283qt_fops);
static struct drm_driver mi0283qt_driver = {
.driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME |
DRIVER_ATOMIC,
.fops = &mi0283qt_fops,
.release = mipi_dbi_release,
DRM_GEM_CMA_VMAP_DRIVER_OPS,
.debugfs_init = mipi_dbi_debugfs_init,
.name = "mi0283qt",
.desc = "Multi-Inno MI0283QT",
.date = "20160614",
.major = 1,
.minor = 0,
};
static const struct of_device_id mi0283qt_of_match[] = {
{ .compatible = "multi-inno,mi0283qt" },
{},
};
MODULE_DEVICE_TABLE(of, mi0283qt_of_match);
static const struct spi_device_id mi0283qt_id[] = {
{ "mi0283qt", 0 },
{ },
};
MODULE_DEVICE_TABLE(spi, mi0283qt_id);
static int mi0283qt_probe(struct spi_device *spi)
{
struct device *dev = &spi->dev;
struct drm_device *drm;
struct mipi_dbi *mipi;
struct gpio_desc *dc;
u32 rotation = 0;
int ret;
mipi = kzalloc(sizeof(*mipi), GFP_KERNEL);
if (!mipi)
return -ENOMEM;
drm = &mipi->drm;
ret = devm_drm_dev_init(dev, drm, &mi0283qt_driver);
if (ret) {
kfree(mipi);
return ret;
}
drm_mode_config_init(drm);
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->regulator = devm_regulator_get(dev, "power");
if (IS_ERR(mipi->regulator))
return PTR_ERR(mipi->regulator);
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(mipi, &mi0283qt_pipe_funcs, &mi0283qt_mode, rotation);
if (ret)
return ret;
drm_mode_config_reset(drm);
ret = drm_dev_register(drm, 0);
if (ret)
return ret;
spi_set_drvdata(spi, drm);
drm_fbdev_generic_setup(drm, 32);
return 0;
}
static int mi0283qt_remove(struct spi_device *spi)
{
struct drm_device *drm = spi_get_drvdata(spi);
drm_dev_unplug(drm);
drm_atomic_helper_shutdown(drm);
return 0;
}
static void mi0283qt_shutdown(struct spi_device *spi)
{
drm_atomic_helper_shutdown(spi_get_drvdata(spi));
}
static int __maybe_unused mi0283qt_pm_suspend(struct device *dev)
{
return drm_mode_config_helper_suspend(dev_get_drvdata(dev));
}
static int __maybe_unused mi0283qt_pm_resume(struct device *dev)
{
drm_mode_config_helper_resume(dev_get_drvdata(dev));
return 0;
}
static const struct dev_pm_ops mi0283qt_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(mi0283qt_pm_suspend, mi0283qt_pm_resume)
};
static struct spi_driver mi0283qt_spi_driver = {
.driver = {
.name = "mi0283qt",
.owner = THIS_MODULE,
.of_match_table = mi0283qt_of_match,
.pm = &mi0283qt_pm_ops,
},
.id_table = mi0283qt_id,
.probe = mi0283qt_probe,
.remove = mi0283qt_remove,
.shutdown = mi0283qt_shutdown,
};
module_spi_driver(mi0283qt_spi_driver);
MODULE_DESCRIPTION("Multi-Inno MI0283QT DRM driver");
MODULE_AUTHOR("Noralf Trønnes");
MODULE_LICENSE("GPL");
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