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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2017 Free Electrons
*/
#include <linux/backlight.h>
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/regulator/consumer.h>
#include <linux/spi/spi.h>
#include <video/mipi_display.h>
#include <drm/drm_device.h>
#include <drm/drm_modes.h>
#include <drm/drm_panel.h>
#define ST7789V_COLMOD_RGB_FMT_18BITS (6 << 4)
#define ST7789V_COLMOD_CTRL_FMT_18BITS (6 << 0)
#define ST7789V_RAMCTRL_CMD 0xb0
#define ST7789V_RAMCTRL_RM_RGB BIT(4)
#define ST7789V_RAMCTRL_DM_RGB BIT(0)
#define ST7789V_RAMCTRL_MAGIC (3 << 6)
#define ST7789V_RAMCTRL_EPF(n) (((n) & 3) << 4)
#define ST7789V_RGBCTRL_CMD 0xb1
#define ST7789V_RGBCTRL_WO BIT(7)
#define ST7789V_RGBCTRL_RCM(n) (((n) & 3) << 5)
#define ST7789V_RGBCTRL_VSYNC_HIGH BIT(3)
#define ST7789V_RGBCTRL_HSYNC_HIGH BIT(2)
#define ST7789V_RGBCTRL_PCLK_HIGH BIT(1)
#define ST7789V_RGBCTRL_VBP(n) ((n) & 0x7f)
#define ST7789V_RGBCTRL_HBP(n) ((n) & 0x1f)
#define ST7789V_PORCTRL_CMD 0xb2
#define ST7789V_PORCTRL_IDLE_BP(n) (((n) & 0xf) << 4)
#define ST7789V_PORCTRL_IDLE_FP(n) ((n) & 0xf)
#define ST7789V_PORCTRL_PARTIAL_BP(n) (((n) & 0xf) << 4)
#define ST7789V_PORCTRL_PARTIAL_FP(n) ((n) & 0xf)
#define ST7789V_GCTRL_CMD 0xb7
#define ST7789V_GCTRL_VGHS(n) (((n) & 7) << 4)
#define ST7789V_GCTRL_VGLS(n) ((n) & 7)
#define ST7789V_VCOMS_CMD 0xbb
#define ST7789V_LCMCTRL_CMD 0xc0
#define ST7789V_LCMCTRL_XBGR BIT(5)
#define ST7789V_LCMCTRL_XMX BIT(3)
#define ST7789V_LCMCTRL_XMH BIT(2)
#define ST7789V_VDVVRHEN_CMD 0xc2
#define ST7789V_VDVVRHEN_CMDEN BIT(0)
#define ST7789V_VRHS_CMD 0xc3
#define ST7789V_VDVS_CMD 0xc4
#define ST7789V_FRCTRL2_CMD 0xc6
#define ST7789V_PWCTRL1_CMD 0xd0
#define ST7789V_PWCTRL1_MAGIC 0xa4
#define ST7789V_PWCTRL1_AVDD(n) (((n) & 3) << 6)
#define ST7789V_PWCTRL1_AVCL(n) (((n) & 3) << 4)
#define ST7789V_PWCTRL1_VDS(n) ((n) & 3)
#define ST7789V_PVGAMCTRL_CMD 0xe0
#define ST7789V_PVGAMCTRL_JP0(n) (((n) & 3) << 4)
#define ST7789V_PVGAMCTRL_JP1(n) (((n) & 3) << 4)
#define ST7789V_PVGAMCTRL_VP0(n) ((n) & 0xf)
#define ST7789V_PVGAMCTRL_VP1(n) ((n) & 0x3f)
#define ST7789V_PVGAMCTRL_VP2(n) ((n) & 0x3f)
#define ST7789V_PVGAMCTRL_VP4(n) ((n) & 0x1f)
#define ST7789V_PVGAMCTRL_VP6(n) ((n) & 0x1f)
#define ST7789V_PVGAMCTRL_VP13(n) ((n) & 0xf)
#define ST7789V_PVGAMCTRL_VP20(n) ((n) & 0x7f)
#define ST7789V_PVGAMCTRL_VP27(n) ((n) & 7)
#define ST7789V_PVGAMCTRL_VP36(n) (((n) & 7) << 4)
#define ST7789V_PVGAMCTRL_VP43(n) ((n) & 0x7f)
#define ST7789V_PVGAMCTRL_VP50(n) ((n) & 0xf)
#define ST7789V_PVGAMCTRL_VP57(n) ((n) & 0x1f)
#define ST7789V_PVGAMCTRL_VP59(n) ((n) & 0x1f)
#define ST7789V_PVGAMCTRL_VP61(n) ((n) & 0x3f)
#define ST7789V_PVGAMCTRL_VP62(n) ((n) & 0x3f)
#define ST7789V_PVGAMCTRL_VP63(n) (((n) & 0xf) << 4)
#define ST7789V_NVGAMCTRL_CMD 0xe1
#define ST7789V_NVGAMCTRL_JN0(n) (((n) & 3) << 4)
#define ST7789V_NVGAMCTRL_JN1(n) (((n) & 3) << 4)
#define ST7789V_NVGAMCTRL_VN0(n) ((n) & 0xf)
#define ST7789V_NVGAMCTRL_VN1(n) ((n) & 0x3f)
#define ST7789V_NVGAMCTRL_VN2(n) ((n) & 0x3f)
#define ST7789V_NVGAMCTRL_VN4(n) ((n) & 0x1f)
#define ST7789V_NVGAMCTRL_VN6(n) ((n) & 0x1f)
#define ST7789V_NVGAMCTRL_VN13(n) ((n) & 0xf)
#define ST7789V_NVGAMCTRL_VN20(n) ((n) & 0x7f)
#define ST7789V_NVGAMCTRL_VN27(n) ((n) & 7)
#define ST7789V_NVGAMCTRL_VN36(n) (((n) & 7) << 4)
#define ST7789V_NVGAMCTRL_VN43(n) ((n) & 0x7f)
#define ST7789V_NVGAMCTRL_VN50(n) ((n) & 0xf)
#define ST7789V_NVGAMCTRL_VN57(n) ((n) & 0x1f)
#define ST7789V_NVGAMCTRL_VN59(n) ((n) & 0x1f)
#define ST7789V_NVGAMCTRL_VN61(n) ((n) & 0x3f)
#define ST7789V_NVGAMCTRL_VN62(n) ((n) & 0x3f)
#define ST7789V_NVGAMCTRL_VN63(n) (((n) & 0xf) << 4)
#define ST7789V_TEST(val, func) \
do { \
if ((val = (func))) \
return val; \
} while (0)
struct st7789v {
struct drm_panel panel;
struct spi_device *spi;
struct gpio_desc *reset;
struct backlight_device *backlight;
struct regulator *power;
};
enum st7789v_prefix {
ST7789V_COMMAND = 0,
ST7789V_DATA = 1,
};
static inline struct st7789v *panel_to_st7789v(struct drm_panel *panel)
{
return container_of(panel, struct st7789v, panel);
}
static int st7789v_spi_write(struct st7789v *ctx, enum st7789v_prefix prefix,
u8 data)
{
struct spi_transfer xfer = { };
struct spi_message msg;
u16 txbuf = ((prefix & 1) << 8) | data;
spi_message_init(&msg);
xfer.tx_buf = &txbuf;
xfer.bits_per_word = 9;
xfer.len = sizeof(txbuf);
spi_message_add_tail(&xfer, &msg);
return spi_sync(ctx->spi, &msg);
}
static int st7789v_write_command(struct st7789v *ctx, u8 cmd)
{
return st7789v_spi_write(ctx, ST7789V_COMMAND, cmd);
}
static int st7789v_write_data(struct st7789v *ctx, u8 cmd)
{
return st7789v_spi_write(ctx, ST7789V_DATA, cmd);
}
static const struct drm_display_mode default_mode = {
.clock = 7000,
.hdisplay = 240,
.hsync_start = 240 + 38,
.hsync_end = 240 + 38 + 10,
.htotal = 240 + 38 + 10 + 10,
.vdisplay = 320,
.vsync_start = 320 + 8,
.vsync_end = 320 + 8 + 4,
.vtotal = 320 + 8 + 4 + 4,
.vrefresh = 60,
};
static int st7789v_get_modes(struct drm_panel *panel)
{
struct drm_connector *connector = panel->connector;
struct drm_display_mode *mode;
mode = drm_mode_duplicate(panel->drm, &default_mode);
if (!mode) {
dev_err(panel->drm->dev, "failed to add mode %ux%ux@%u\n",
default_mode.hdisplay, default_mode.vdisplay,
default_mode.vrefresh);
return -ENOMEM;
}
drm_mode_set_name(mode);
mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
drm_mode_probed_add(connector, mode);
panel->connector->display_info.width_mm = 61;
panel->connector->display_info.height_mm = 103;
return 1;
}
static int st7789v_prepare(struct drm_panel *panel)
{
struct st7789v *ctx = panel_to_st7789v(panel);
int ret;
ret = regulator_enable(ctx->power);
if (ret)
return ret;
gpiod_set_value(ctx->reset, 1);
msleep(30);
gpiod_set_value(ctx->reset, 0);
msleep(120);
ST7789V_TEST(ret, st7789v_write_command(ctx, MIPI_DCS_EXIT_SLEEP_MODE));
/* We need to wait 120ms after a sleep out command */
msleep(120);
ST7789V_TEST(ret, st7789v_write_command(ctx,
MIPI_DCS_SET_ADDRESS_MODE));
ST7789V_TEST(ret, st7789v_write_data(ctx, 0));
ST7789V_TEST(ret, st7789v_write_command(ctx,
MIPI_DCS_SET_PIXEL_FORMAT));
ST7789V_TEST(ret, st7789v_write_data(ctx,
(MIPI_DCS_PIXEL_FMT_18BIT << 4) |
(MIPI_DCS_PIXEL_FMT_18BIT)));
ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_PORCTRL_CMD));
ST7789V_TEST(ret, st7789v_write_data(ctx, 0xc));
ST7789V_TEST(ret, st7789v_write_data(ctx, 0xc));
ST7789V_TEST(ret, st7789v_write_data(ctx, 0));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PORCTRL_IDLE_BP(3) |
ST7789V_PORCTRL_IDLE_FP(3)));
ST7789V_TEST(ret, st7789v_write_data(ctx,
ST7789V_PORCTRL_PARTIAL_BP(3) |
ST7789V_PORCTRL_PARTIAL_FP(3)));
ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_GCTRL_CMD));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_GCTRL_VGLS(5) |
ST7789V_GCTRL_VGHS(3)));
ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_VCOMS_CMD));
ST7789V_TEST(ret, st7789v_write_data(ctx, 0x2b));
ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_LCMCTRL_CMD));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_LCMCTRL_XMH |
ST7789V_LCMCTRL_XMX |
ST7789V_LCMCTRL_XBGR));
ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_VDVVRHEN_CMD));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_VDVVRHEN_CMDEN));
ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_VRHS_CMD));
ST7789V_TEST(ret, st7789v_write_data(ctx, 0xf));
ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_VDVS_CMD));
ST7789V_TEST(ret, st7789v_write_data(ctx, 0x20));
ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_FRCTRL2_CMD));
ST7789V_TEST(ret, st7789v_write_data(ctx, 0xf));
ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_PWCTRL1_CMD));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PWCTRL1_MAGIC));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PWCTRL1_AVDD(2) |
ST7789V_PWCTRL1_AVCL(2) |
ST7789V_PWCTRL1_VDS(1)));
ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_PVGAMCTRL_CMD));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP63(0xd)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP1(0xca)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP2(0xe)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP4(8)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP6(9)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP13(7)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP20(0x2d)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP27(0xb) |
ST7789V_PVGAMCTRL_VP36(3)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP43(0x3d)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_JP1(3) |
ST7789V_PVGAMCTRL_VP50(4)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP57(0xa)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP59(0xa)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP61(0x1b)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP62(0x28)));
ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_NVGAMCTRL_CMD));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN63(0xd)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN1(0xca)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN2(0xf)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN4(8)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN6(8)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN13(7)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN20(0x2e)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN27(0xc) |
ST7789V_NVGAMCTRL_VN36(5)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN43(0x40)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_JN1(3) |
ST7789V_NVGAMCTRL_VN50(4)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN57(9)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN59(0xb)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN61(0x1b)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN62(0x28)));
ST7789V_TEST(ret, st7789v_write_command(ctx, MIPI_DCS_ENTER_INVERT_MODE));
ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_RAMCTRL_CMD));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_RAMCTRL_DM_RGB |
ST7789V_RAMCTRL_RM_RGB));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_RAMCTRL_EPF(3) |
ST7789V_RAMCTRL_MAGIC));
ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_RGBCTRL_CMD));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_RGBCTRL_WO |
ST7789V_RGBCTRL_RCM(2) |
ST7789V_RGBCTRL_VSYNC_HIGH |
ST7789V_RGBCTRL_HSYNC_HIGH |
ST7789V_RGBCTRL_PCLK_HIGH));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_RGBCTRL_VBP(8)));
ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_RGBCTRL_HBP(20)));
return 0;
}
static int st7789v_enable(struct drm_panel *panel)
{
struct st7789v *ctx = panel_to_st7789v(panel);
if (ctx->backlight) {
ctx->backlight->props.state &= ~BL_CORE_FBBLANK;
ctx->backlight->props.power = FB_BLANK_UNBLANK;
backlight_update_status(ctx->backlight);
}
return st7789v_write_command(ctx, MIPI_DCS_SET_DISPLAY_ON);
}
static int st7789v_disable(struct drm_panel *panel)
{
struct st7789v *ctx = panel_to_st7789v(panel);
int ret;
ST7789V_TEST(ret, st7789v_write_command(ctx, MIPI_DCS_SET_DISPLAY_OFF));
if (ctx->backlight) {
ctx->backlight->props.power = FB_BLANK_POWERDOWN;
ctx->backlight->props.state |= BL_CORE_FBBLANK;
backlight_update_status(ctx->backlight);
}
return 0;
}
static int st7789v_unprepare(struct drm_panel *panel)
{
struct st7789v *ctx = panel_to_st7789v(panel);
int ret;
ST7789V_TEST(ret, st7789v_write_command(ctx, MIPI_DCS_ENTER_SLEEP_MODE));
regulator_disable(ctx->power);
return 0;
}
static const struct drm_panel_funcs st7789v_drm_funcs = {
.disable = st7789v_disable,
.enable = st7789v_enable,
.get_modes = st7789v_get_modes,
.prepare = st7789v_prepare,
.unprepare = st7789v_unprepare,
};
static int st7789v_probe(struct spi_device *spi)
{
struct device_node *backlight;
struct st7789v *ctx;
int ret;
ctx = devm_kzalloc(&spi->dev, sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return -ENOMEM;
spi_set_drvdata(spi, ctx);
ctx->spi = spi;
ctx->panel.dev = &spi->dev;
ctx->panel.funcs = &st7789v_drm_funcs;
ctx->power = devm_regulator_get(&spi->dev, "power");
if (IS_ERR(ctx->power))
return PTR_ERR(ctx->power);
ctx->reset = devm_gpiod_get(&spi->dev, "reset", GPIOD_OUT_LOW);
if (IS_ERR(ctx->reset)) {
dev_err(&spi->dev, "Couldn't get our reset line\n");
return PTR_ERR(ctx->reset);
}
backlight = of_parse_phandle(spi->dev.of_node, "backlight", 0);
if (backlight) {
ctx->backlight = of_find_backlight_by_node(backlight);
of_node_put(backlight);
if (!ctx->backlight)
return -EPROBE_DEFER;
}
ret = drm_panel_add(&ctx->panel);
if (ret < 0)
goto err_free_backlight;
return 0;
err_free_backlight:
if (ctx->backlight)
put_device(&ctx->backlight->dev);
return ret;
}
static int st7789v_remove(struct spi_device *spi)
{
struct st7789v *ctx = spi_get_drvdata(spi);
drm_panel_remove(&ctx->panel);
if (ctx->backlight)
put_device(&ctx->backlight->dev);
return 0;
}
static const struct of_device_id st7789v_of_match[] = {
{ .compatible = "sitronix,st7789v" },
{ }
};
MODULE_DEVICE_TABLE(of, st7789v_of_match);
static struct spi_driver st7789v_driver = {
.probe = st7789v_probe,
.remove = st7789v_remove,
.driver = {
.name = "st7789v",
.of_match_table = st7789v_of_match,
},
};
module_spi_driver(st7789v_driver);
MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
MODULE_DESCRIPTION("Sitronix st7789v LCD Driver");
MODULE_LICENSE("GPL v2");
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