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// SPDX-License-Identifier: GPL-2.0+
/*
* DRM driver for Sitronix ST7735R panels
*
* Copyright 2017 David Lechner <david@lechnology.com>
*/
#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_cma_helper.h>
#include <drm/drm_gem_framebuffer_helper.h>
#include <drm/tinydrm/mipi-dbi.h>
#include <drm/tinydrm/tinydrm-helpers.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)
static void jd_t18003_t01_pipe_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);
int ret, idx;
u8 addr_mode;
if (!drm_dev_enter(pipe->crtc.dev, &idx))
return;
DRM_DEBUG_KMS("\n");
ret = mipi_dbi_poweron_reset(mipi);
if (ret)
goto out_exit;
msleep(150);
mipi_dbi_command(mipi, MIPI_DCS_EXIT_SLEEP_MODE);
msleep(500);
mipi_dbi_command(mipi, ST7735R_FRMCTR1, 0x01, 0x2c, 0x2d);
mipi_dbi_command(mipi, ST7735R_FRMCTR2, 0x01, 0x2c, 0x2d);
mipi_dbi_command(mipi, ST7735R_FRMCTR3, 0x01, 0x2c, 0x2d, 0x01, 0x2c,
0x2d);
mipi_dbi_command(mipi, ST7735R_INVCTR, 0x07);
mipi_dbi_command(mipi, ST7735R_PWCTR1, 0xa2, 0x02, 0x84);
mipi_dbi_command(mipi, ST7735R_PWCTR2, 0xc5);
mipi_dbi_command(mipi, ST7735R_PWCTR3, 0x0a, 0x00);
mipi_dbi_command(mipi, ST7735R_PWCTR4, 0x8a, 0x2a);
mipi_dbi_command(mipi, ST7735R_PWCTR5, 0x8a, 0xee);
mipi_dbi_command(mipi, ST7735R_VMCTR1, 0x0e);
mipi_dbi_command(mipi, MIPI_DCS_EXIT_INVERT_MODE);
switch (mipi->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;
}
mipi_dbi_command(mipi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);
mipi_dbi_command(mipi, MIPI_DCS_SET_PIXEL_FORMAT,
MIPI_DCS_PIXEL_FMT_16BIT);
mipi_dbi_command(mipi, ST7735R_GAMCTRP1, 0x02, 0x1c, 0x07, 0x12, 0x37,
0x32, 0x29, 0x2d, 0x29, 0x25, 0x2b, 0x39, 0x00, 0x01,
0x03, 0x10);
mipi_dbi_command(mipi, ST7735R_GAMCTRN1, 0x03, 0x1d, 0x07, 0x06, 0x2e,
0x2c, 0x29, 0x2d, 0x2e, 0x2e, 0x37, 0x3f, 0x00, 0x00,
0x02, 0x10);
mipi_dbi_command(mipi, MIPI_DCS_SET_DISPLAY_ON);
msleep(100);
mipi_dbi_command(mipi, MIPI_DCS_ENTER_NORMAL_MODE);
msleep(20);
mipi_dbi_enable_flush(mipi, crtc_state, plane_state);
out_exit:
drm_dev_exit(idx);
}
static const struct drm_simple_display_pipe_funcs jd_t18003_t01_pipe_funcs = {
.enable = jd_t18003_t01_pipe_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 jd_t18003_t01_mode = {
DRM_SIMPLE_MODE(128, 160, 28, 35),
};
DEFINE_DRM_GEM_CMA_FOPS(st7735r_fops);
static struct drm_driver st7735r_driver = {
.driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME |
DRIVER_ATOMIC,
.fops = &st7735r_fops,
.release = mipi_dbi_release,
DRM_GEM_CMA_VMAP_DRIVER_OPS,
.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" },
{ },
};
MODULE_DEVICE_TABLE(of, st7735r_of_match);
static const struct spi_device_id st7735r_id[] = {
{ "jd-t18003-t01", 0 },
{ },
};
MODULE_DEVICE_TABLE(spi, st7735r_id);
static int st7735r_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, &st7735r_driver);
if (ret) {
kfree(mipi);
return ret;
}
drm_mode_config_init(drm);
mipi->reset = devm_gpiod_get(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(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;
/* Cannot read from Adafruit 1.8" display via SPI */
mipi->read_commands = NULL;
ret = mipi_dbi_init(mipi, &jd_t18003_t01_pipe_funcs, &jd_t18003_t01_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 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",
.owner = THIS_MODULE,
.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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