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// SPDX-License-Identifier: GPL-2.0+
/*
* DRM driver for display panels connected to a Sitronix ST7715R or ST7735R
* display controller in SPI mode.
*
* Copyright 2017 David Lechner <david@lechnology.com>
* Copyright (C) 2019 Glider bvba
*/
#include <linux/backlight.h>
#include <linux/delay.h>
#include <linux/dma-buf.h>
#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/property.h>
#include <linux/spi/spi.h>
#include <video/mipi_display.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_drv.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_gem_atomic_helper.h>
#include <drm/drm_gem_cma_helper.h>
#include <drm/drm_managed.h>
#include <drm/drm_mipi_dbi.h>
#define ST7735R_FRMCTR1 0xb1
#define ST7735R_FRMCTR2 0xb2
#define ST7735R_FRMCTR3 0xb3
#define ST7735R_INVCTR 0xb4
#define ST7735R_PWCTR1 0xc0
#define ST7735R_PWCTR2 0xc1
#define ST7735R_PWCTR3 0xc2
#define ST7735R_PWCTR4 0xc3
#define ST7735R_PWCTR5 0xc4
#define ST7735R_VMCTR1 0xc5
#define ST7735R_GAMCTRP1 0xe0
#define ST7735R_GAMCTRN1 0xe1
#define ST7735R_MY BIT(7)
#define ST7735R_MX BIT(6)
#define ST7735R_MV BIT(5)
#define ST7735R_RGB BIT(3)
struct st7735r_cfg {
const struct drm_display_mode mode;
unsigned int left_offset;
unsigned int top_offset;
unsigned int write_only:1;
unsigned int rgb:1; /* RGB (vs. BGR) */
};
struct st7735r_priv {
struct mipi_dbi_dev dbidev; /* Must be first for .release() */
const struct st7735r_cfg *cfg;
};
static void st7735r_pipe_enable(struct drm_simple_display_pipe *pipe,
struct drm_crtc_state *crtc_state,
struct drm_plane_state *plane_state)
{
struct mipi_dbi_dev *dbidev = drm_to_mipi_dbi_dev(pipe->crtc.dev);
struct st7735r_priv *priv = container_of(dbidev, struct st7735r_priv,
dbidev);
struct mipi_dbi *dbi = &dbidev->dbi;
int ret, idx;
u8 addr_mode;
if (!drm_dev_enter(pipe->crtc.dev, &idx))
return;
DRM_DEBUG_KMS("\n");
ret = mipi_dbi_poweron_reset(dbidev);
if (ret)
goto out_exit;
msleep(150);
mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE);
msleep(500);
mipi_dbi_command(dbi, ST7735R_FRMCTR1, 0x01, 0x2c, 0x2d);
mipi_dbi_command(dbi, ST7735R_FRMCTR2, 0x01, 0x2c, 0x2d);
mipi_dbi_command(dbi, ST7735R_FRMCTR3, 0x01, 0x2c, 0x2d, 0x01, 0x2c,
0x2d);
mipi_dbi_command(dbi, ST7735R_INVCTR, 0x07);
mipi_dbi_command(dbi, ST7735R_PWCTR1, 0xa2, 0x02, 0x84);
mipi_dbi_command(dbi, ST7735R_PWCTR2, 0xc5);
mipi_dbi_command(dbi, ST7735R_PWCTR3, 0x0a, 0x00);
mipi_dbi_command(dbi, ST7735R_PWCTR4, 0x8a, 0x2a);
mipi_dbi_command(dbi, ST7735R_PWCTR5, 0x8a, 0xee);
mipi_dbi_command(dbi, ST7735R_VMCTR1, 0x0e);
mipi_dbi_command(dbi, MIPI_DCS_EXIT_INVERT_MODE);
switch (dbidev->rotation) {
default:
addr_mode = ST7735R_MX | ST7735R_MY;
break;
case 90:
addr_mode = ST7735R_MX | ST7735R_MV;
break;
case 180:
addr_mode = 0;
break;
case 270:
addr_mode = ST7735R_MY | ST7735R_MV;
break;
}
if (priv->cfg->rgb)
addr_mode |= ST7735R_RGB;
mipi_dbi_command(dbi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);
mipi_dbi_command(dbi, MIPI_DCS_SET_PIXEL_FORMAT,
MIPI_DCS_PIXEL_FMT_16BIT);
mipi_dbi_command(dbi, ST7735R_GAMCTRP1, 0x02, 0x1c, 0x07, 0x12, 0x37,
0x32, 0x29, 0x2d, 0x29, 0x25, 0x2b, 0x39, 0x00, 0x01,
0x03, 0x10);
mipi_dbi_command(dbi, ST7735R_GAMCTRN1, 0x03, 0x1d, 0x07, 0x06, 0x2e,
0x2c, 0x29, 0x2d, 0x2e, 0x2e, 0x37, 0x3f, 0x00, 0x00,
0x02, 0x10);
mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON);
msleep(100);
mipi_dbi_command(dbi, MIPI_DCS_ENTER_NORMAL_MODE);
msleep(20);
mipi_dbi_enable_flush(dbidev, crtc_state, plane_state);
out_exit:
drm_dev_exit(idx);
}
static const struct drm_simple_display_pipe_funcs st7735r_pipe_funcs = {
.enable = st7735r_pipe_enable,
.disable = mipi_dbi_pipe_disable,
.update = mipi_dbi_pipe_update,
.prepare_fb = drm_gem_simple_display_pipe_prepare_fb,
};
static const struct st7735r_cfg jd_t18003_t01_cfg = {
.mode = { DRM_SIMPLE_MODE(128, 160, 28, 35) },
/* Cannot read from Adafruit 1.8" display via SPI */
.write_only = true,
};
static const struct st7735r_cfg rh128128t_cfg = {
.mode = { DRM_SIMPLE_MODE(128, 128, 25, 26) },
.left_offset = 2,
.top_offset = 3,
.rgb = true,
};
DEFINE_DRM_GEM_CMA_FOPS(st7735r_fops);
static const struct drm_driver st7735r_driver = {
.driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
.fops = &st7735r_fops,
DRM_GEM_CMA_DRIVER_OPS_VMAP,
.debugfs_init = mipi_dbi_debugfs_init,
.name = "st7735r",
.desc = "Sitronix ST7735R",
.date = "20171128",
.major = 1,
.minor = 0,
};
static const struct of_device_id st7735r_of_match[] = {
{ .compatible = "jianda,jd-t18003-t01", .data = &jd_t18003_t01_cfg },
{ .compatible = "okaya,rh128128t", .data = &rh128128t_cfg },
{ },
};
MODULE_DEVICE_TABLE(of, st7735r_of_match);
static const struct spi_device_id st7735r_id[] = {
{ "jd-t18003-t01", (uintptr_t)&jd_t18003_t01_cfg },
{ },
};
MODULE_DEVICE_TABLE(spi, st7735r_id);
static int st7735r_probe(struct spi_device *spi)
{
struct device *dev = &spi->dev;
const struct st7735r_cfg *cfg;
struct mipi_dbi_dev *dbidev;
struct st7735r_priv *priv;
struct drm_device *drm;
struct mipi_dbi *dbi;
struct gpio_desc *dc;
u32 rotation = 0;
int ret;
cfg = device_get_match_data(&spi->dev);
if (!cfg)
cfg = (void *)spi_get_device_id(spi)->driver_data;
priv = devm_drm_dev_alloc(dev, &st7735r_driver,
struct st7735r_priv, dbidev.drm);
if (IS_ERR(priv))
return PTR_ERR(priv);
dbidev = &priv->dbidev;
priv->cfg = cfg;
dbi = &dbidev->dbi;
drm = &dbidev->drm;
dbi->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
if (IS_ERR(dbi->reset)) {
DRM_DEV_ERROR(dev, "Failed to get gpio 'reset'\n");
return PTR_ERR(dbi->reset);
}
dc = devm_gpiod_get(dev, "dc", GPIOD_OUT_LOW);
if (IS_ERR(dc)) {
DRM_DEV_ERROR(dev, "Failed to get gpio 'dc'\n");
return PTR_ERR(dc);
}
dbidev->backlight = devm_of_find_backlight(dev);
if (IS_ERR(dbidev->backlight))
return PTR_ERR(dbidev->backlight);
device_property_read_u32(dev, "rotation", &rotation);
ret = mipi_dbi_spi_init(spi, dbi, dc);
if (ret)
return ret;
if (cfg->write_only)
dbi->read_commands = NULL;
dbidev->left_offset = cfg->left_offset;
dbidev->top_offset = cfg->top_offset;
ret = mipi_dbi_dev_init(dbidev, &st7735r_pipe_funcs, &cfg->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, 0);
return 0;
}
static int st7735r_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 st7735r_shutdown(struct spi_device *spi)
{
drm_atomic_helper_shutdown(spi_get_drvdata(spi));
}
static struct spi_driver st7735r_spi_driver = {
.driver = {
.name = "st7735r",
.of_match_table = st7735r_of_match,
},
.id_table = st7735r_id,
.probe = st7735r_probe,
.remove = st7735r_remove,
.shutdown = st7735r_shutdown,
};
module_spi_driver(st7735r_spi_driver);
MODULE_DESCRIPTION("Sitronix ST7735R DRM driver");
MODULE_AUTHOR("David Lechner <david@lechnology.com>");
MODULE_LICENSE("GPL");
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