--- /dev/null
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * DRM driver for Sitronix ST7735R panels
+ *
+ * Copyright 2017 David Lechner <david@lechnology.com>
+ */
+
+#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_fb_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 tinydrm_device *tdev = pipe_to_tinydrm(pipe);
+ struct mipi_dbi *mipi = mipi_dbi_from_tinydrm(tdev);
+ struct device *dev = tdev->drm->dev;
+ int ret;
+ u8 addr_mode;
+
+ DRM_DEBUG_KMS("\n");
+
+ mipi_dbi_hw_reset(mipi);
+
+ ret = mipi_dbi_command(mipi, MIPI_DCS_SOFT_RESET);
+ if (ret) {
+ DRM_DEV_ERROR(dev, "Error sending command %d\n", ret);
+ return;
+ }
+
+ 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_pipe_enable(pipe, crtc_state);
+}
+
+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 = tinydrm_display_pipe_update,
+ .prepare_fb = tinydrm_display_pipe_prepare_fb,
+};
+
+static const struct drm_display_mode jd_t18003_t01_mode = {
+ TINYDRM_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,
+ TINYDRM_GEM_DRIVER_OPS,
+ .lastclose = drm_fb_helper_lastclose,
+ .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 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(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 = tinydrm_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(&spi->dev, mipi, &jd_t18003_t01_pipe_funcs,
+ &st7735r_driver, &jd_t18003_t01_mode, rotation);
+ if (ret)
+ return ret;
+
+ spi_set_drvdata(spi, mipi);
+
+ return devm_tinydrm_register(&mipi->tinydrm);
+}
+
+static void st7735r_shutdown(struct spi_device *spi)
+{
+ struct mipi_dbi *mipi = spi_get_drvdata(spi);
+
+ tinydrm_shutdown(&mipi->tinydrm);
+}
+
+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,
+ .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");
projects / openwrt / staging / blogic.git / commitdiff