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1// SPDX-License-Identifier: GPL-2.0+2/*3 * DRM driver for display panels connected to a Sitronix ST7715R or ST7735R4 * display controller in SPI mode.5 *6 * Copyright 2017 David Lechner <david@lechnology.com>7 * Copyright (C) 2019 Glider bvba8 */9 10#include <linux/backlight.h>11#include <linux/delay.h>12#include <linux/dma-buf.h>13#include <linux/gpio/consumer.h>14#include <linux/module.h>15#include <linux/property.h>16#include <linux/spi/spi.h>17#include <video/mipi_display.h>18 19#include <drm/drm_atomic_helper.h>20#include <drm/drm_drv.h>21#include <drm/drm_fbdev_dma.h>22#include <drm/drm_gem_atomic_helper.h>23#include <drm/drm_gem_dma_helper.h>24#include <drm/drm_managed.h>25#include <drm/drm_mipi_dbi.h>26 27#define ST7735R_FRMCTR1 0xb128#define ST7735R_FRMCTR2 0xb229#define ST7735R_FRMCTR3 0xb330#define ST7735R_INVCTR 0xb431#define ST7735R_PWCTR1 0xc032#define ST7735R_PWCTR2 0xc133#define ST7735R_PWCTR3 0xc234#define ST7735R_PWCTR4 0xc335#define ST7735R_PWCTR5 0xc436#define ST7735R_VMCTR1 0xc537#define ST7735R_GAMCTRP1 0xe038#define ST7735R_GAMCTRN1 0xe139 40#define ST7735R_MY BIT(7)41#define ST7735R_MX BIT(6)42#define ST7735R_MV BIT(5)43#define ST7735R_RGB BIT(3)44 45struct st7735r_cfg {46 const struct drm_display_mode mode;47 unsigned int left_offset;48 unsigned int top_offset;49 unsigned int write_only:1;50 unsigned int rgb:1; /* RGB (vs. BGR) */51};52 53struct st7735r_priv {54 struct mipi_dbi_dev dbidev; /* Must be first for .release() */55 const struct st7735r_cfg *cfg;56};57 58static void st7735r_pipe_enable(struct drm_simple_display_pipe *pipe,59 struct drm_crtc_state *crtc_state,60 struct drm_plane_state *plane_state)61{62 struct mipi_dbi_dev *dbidev = drm_to_mipi_dbi_dev(pipe->crtc.dev);63 struct st7735r_priv *priv = container_of(dbidev, struct st7735r_priv,64 dbidev);65 struct mipi_dbi *dbi = &dbidev->dbi;66 int ret, idx;67 u8 addr_mode;68 69 if (!drm_dev_enter(pipe->crtc.dev, &idx))70 return;71 72 DRM_DEBUG_KMS("\n");73 74 ret = mipi_dbi_poweron_reset(dbidev);75 if (ret)76 goto out_exit;77 78 msleep(150);79 80 mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE);81 msleep(500);82 83 mipi_dbi_command(dbi, ST7735R_FRMCTR1, 0x01, 0x2c, 0x2d);84 mipi_dbi_command(dbi, ST7735R_FRMCTR2, 0x01, 0x2c, 0x2d);85 mipi_dbi_command(dbi, ST7735R_FRMCTR3, 0x01, 0x2c, 0x2d, 0x01, 0x2c,86 0x2d);87 mipi_dbi_command(dbi, ST7735R_INVCTR, 0x07);88 mipi_dbi_command(dbi, ST7735R_PWCTR1, 0xa2, 0x02, 0x84);89 mipi_dbi_command(dbi, ST7735R_PWCTR2, 0xc5);90 mipi_dbi_command(dbi, ST7735R_PWCTR3, 0x0a, 0x00);91 mipi_dbi_command(dbi, ST7735R_PWCTR4, 0x8a, 0x2a);92 mipi_dbi_command(dbi, ST7735R_PWCTR5, 0x8a, 0xee);93 mipi_dbi_command(dbi, ST7735R_VMCTR1, 0x0e);94 mipi_dbi_command(dbi, MIPI_DCS_EXIT_INVERT_MODE);95 switch (dbidev->rotation) {96 default:97 addr_mode = ST7735R_MX | ST7735R_MY;98 break;99 case 90:100 addr_mode = ST7735R_MX | ST7735R_MV;101 break;102 case 180:103 addr_mode = 0;104 break;105 case 270:106 addr_mode = ST7735R_MY | ST7735R_MV;107 break;108 }109 110 if (priv->cfg->rgb)111 addr_mode |= ST7735R_RGB;112 113 mipi_dbi_command(dbi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);114 mipi_dbi_command(dbi, MIPI_DCS_SET_PIXEL_FORMAT,115 MIPI_DCS_PIXEL_FMT_16BIT);116 mipi_dbi_command(dbi, ST7735R_GAMCTRP1, 0x02, 0x1c, 0x07, 0x12, 0x37,117 0x32, 0x29, 0x2d, 0x29, 0x25, 0x2b, 0x39, 0x00, 0x01,118 0x03, 0x10);119 mipi_dbi_command(dbi, ST7735R_GAMCTRN1, 0x03, 0x1d, 0x07, 0x06, 0x2e,120 0x2c, 0x29, 0x2d, 0x2e, 0x2e, 0x37, 0x3f, 0x00, 0x00,121 0x02, 0x10);122 mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON);123 124 msleep(100);125 126 mipi_dbi_command(dbi, MIPI_DCS_ENTER_NORMAL_MODE);127 128 msleep(20);129 130 mipi_dbi_enable_flush(dbidev, crtc_state, plane_state);131out_exit:132 drm_dev_exit(idx);133}134 135static const struct drm_simple_display_pipe_funcs st7735r_pipe_funcs = {136 DRM_MIPI_DBI_SIMPLE_DISPLAY_PIPE_FUNCS(st7735r_pipe_enable),137};138 139static const struct st7735r_cfg jd_t18003_t01_cfg = {140 .mode = { DRM_SIMPLE_MODE(128, 160, 28, 35) },141 /* Cannot read from Adafruit 1.8" display via SPI */142 .write_only = true,143};144 145static const struct st7735r_cfg rh128128t_cfg = {146 .mode = { DRM_SIMPLE_MODE(128, 128, 25, 26) },147 .left_offset = 2,148 .top_offset = 3,149 .rgb = true,150};151 152DEFINE_DRM_GEM_DMA_FOPS(st7735r_fops);153 154static const struct drm_driver st7735r_driver = {155 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,156 .fops = &st7735r_fops,157 DRM_GEM_DMA_DRIVER_OPS_VMAP,158 .debugfs_init = mipi_dbi_debugfs_init,159 .name = "st7735r",160 .desc = "Sitronix ST7735R",161 .date = "20171128",162 .major = 1,163 .minor = 0,164};165 166static const struct of_device_id st7735r_of_match[] = {167 { .compatible = "jianda,jd-t18003-t01", .data = &jd_t18003_t01_cfg },168 { .compatible = "okaya,rh128128t", .data = &rh128128t_cfg },169 { },170};171MODULE_DEVICE_TABLE(of, st7735r_of_match);172 173static const struct spi_device_id st7735r_id[] = {174 { "jd-t18003-t01", (uintptr_t)&jd_t18003_t01_cfg },175 { "rh128128t", (uintptr_t)&rh128128t_cfg },176 { },177};178MODULE_DEVICE_TABLE(spi, st7735r_id);179 180static int st7735r_probe(struct spi_device *spi)181{182 struct device *dev = &spi->dev;183 const struct st7735r_cfg *cfg;184 struct mipi_dbi_dev *dbidev;185 struct st7735r_priv *priv;186 struct drm_device *drm;187 struct mipi_dbi *dbi;188 struct gpio_desc *dc;189 u32 rotation = 0;190 int ret;191 192 cfg = device_get_match_data(&spi->dev);193 if (!cfg)194 cfg = (void *)spi_get_device_id(spi)->driver_data;195 196 priv = devm_drm_dev_alloc(dev, &st7735r_driver,197 struct st7735r_priv, dbidev.drm);198 if (IS_ERR(priv))199 return PTR_ERR(priv);200 201 dbidev = &priv->dbidev;202 priv->cfg = cfg;203 204 dbi = &dbidev->dbi;205 drm = &dbidev->drm;206 207 dbi->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);208 if (IS_ERR(dbi->reset))209 return dev_err_probe(dev, PTR_ERR(dbi->reset), "Failed to get GPIO 'reset'\n");210 211 dc = devm_gpiod_get(dev, "dc", GPIOD_OUT_LOW);212 if (IS_ERR(dc))213 return dev_err_probe(dev, PTR_ERR(dc), "Failed to get GPIO 'dc'\n");214 215 dbidev->backlight = devm_of_find_backlight(dev);216 if (IS_ERR(dbidev->backlight))217 return PTR_ERR(dbidev->backlight);218 219 device_property_read_u32(dev, "rotation", &rotation);220 221 ret = mipi_dbi_spi_init(spi, dbi, dc);222 if (ret)223 return ret;224 225 if (cfg->write_only)226 dbi->read_commands = NULL;227 228 dbidev->left_offset = cfg->left_offset;229 dbidev->top_offset = cfg->top_offset;230 231 ret = mipi_dbi_dev_init(dbidev, &st7735r_pipe_funcs, &cfg->mode,232 rotation);233 if (ret)234 return ret;235 236 drm_mode_config_reset(drm);237 238 ret = drm_dev_register(drm, 0);239 if (ret)240 return ret;241 242 spi_set_drvdata(spi, drm);243 244 drm_fbdev_dma_setup(drm, 0);245 246 return 0;247}248 249static void st7735r_remove(struct spi_device *spi)250{251 struct drm_device *drm = spi_get_drvdata(spi);252 253 drm_dev_unplug(drm);254 drm_atomic_helper_shutdown(drm);255}256 257static void st7735r_shutdown(struct spi_device *spi)258{259 drm_atomic_helper_shutdown(spi_get_drvdata(spi));260}261 262static struct spi_driver st7735r_spi_driver = {263 .driver = {264 .name = "st7735r",265 .of_match_table = st7735r_of_match,266 },267 .id_table = st7735r_id,268 .probe = st7735r_probe,269 .remove = st7735r_remove,270 .shutdown = st7735r_shutdown,271};272module_spi_driver(st7735r_spi_driver);273 274MODULE_DESCRIPTION("Sitronix ST7735R DRM driver");275MODULE_AUTHOR("David Lechner <david@lechnology.com>");276MODULE_LICENSE("GPL");277