Add support for Adafruit MIPI DBI compatible SPI displays: 2.8" PiTFT 320x240 TFT+Touchscreen for Raspberry Pi (#1601)
Signed-off-by: Noralf Trønnes noralf@tronnes.org --- drivers/gpu/drm/tinydrm/Kconfig | 9 ++ drivers/gpu/drm/tinydrm/Makefile | 3 + drivers/gpu/drm/tinydrm/adafruit-tft.c | 257 +++++++++++++++++++++++++++++++++ include/drm/tinydrm/ili9340.h | 47 ++++++ 4 files changed, 316 insertions(+) create mode 100644 drivers/gpu/drm/tinydrm/adafruit-tft.c create mode 100644 include/drm/tinydrm/ili9340.h
diff --git a/drivers/gpu/drm/tinydrm/Kconfig b/drivers/gpu/drm/tinydrm/Kconfig index 8c41eee..621be2f 100644 --- a/drivers/gpu/drm/tinydrm/Kconfig +++ b/drivers/gpu/drm/tinydrm/Kconfig @@ -13,4 +13,13 @@ menuconfig DRM_TINYDRM config TINYDRM_MIPI_DBI tristate
+config TINYDRM_ADAFRUIT_TFT + tristate "DRM driver for Adafruit SPI TFT displays" + depends on DRM_TINYDRM && SPI + select LCDREG_SPI + select TINYDRM_MIPI_DBI + help + DRM driver for the following Adafruit displays: + 2.8" PiTFT 320x240 for Raspberry Pi - ILI9340 (#1601) + source "drivers/gpu/drm/tinydrm/lcdreg/Kconfig" diff --git a/drivers/gpu/drm/tinydrm/Makefile b/drivers/gpu/drm/tinydrm/Makefile index 35ba822..3c00201 100644 --- a/drivers/gpu/drm/tinydrm/Makefile +++ b/drivers/gpu/drm/tinydrm/Makefile @@ -3,3 +3,6 @@ obj-$(CONFIG_LCDREG) += lcdreg/
# Controllers obj-$(CONFIG_TINYDRM_MIPI_DBI) += mipi-dbi.o + +# Displays +obj-$(CONFIG_TINYDRM_ADAFRUIT_TFT) += adafruit-tft.o diff --git a/drivers/gpu/drm/tinydrm/adafruit-tft.c b/drivers/gpu/drm/tinydrm/adafruit-tft.c new file mode 100644 index 0000000..20da98d --- /dev/null +++ b/drivers/gpu/drm/tinydrm/adafruit-tft.c @@ -0,0 +1,257 @@ +/* + * DRM driver for Adafruit MIPI compatible SPI TFT displays + * + * Copyright 2016 Noralf Trønnes + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ + +#include <drm/tinydrm/ili9340.h> +#include <drm/tinydrm/lcdreg-spi.h> +#include <drm/tinydrm/mipi-dbi.h> +#include <drm/tinydrm/tinydrm.h> +#include <linux/delay.h> +#include <linux/module.h> +#include <linux/of_device.h> +#include <linux/property.h> +#include <linux/regulator/consumer.h> +#include <linux/spi/spi.h> +#include <video/mipi_display.h> + +enum adafruit_tft_displays { + ADAFRUIT_1601 = 1601, + ADAFRUIT_797 = 797, + ADAFRUIT_358 = 358, +}; + +static u32 adafruit_tft_get_rotation(struct device *dev) +{ + u32 rotation = 0; + + device_property_read_u32(dev, "rotation", &rotation); + + return rotation; +} + +static int adafruit_tft_1601_panel_prepare(struct drm_panel *panel) +{ + struct tinydrm_device *tdev = tinydrm_from_panel(panel); + struct lcdreg *reg = tdev->lcdreg; + u8 addr_mode; + int ret; + + dev_dbg(tdev->base->dev, "%s\n", __func__); + + if (tdev->regulator) { + ret = regulator_enable(tdev->regulator); + if (ret) { + dev_err(tdev->base->dev, + "Failed to enable regulator %d\n", ret); + return ret; + } + } + + mipi_dbi_debug_dump_regs(reg); + + /* Avoid flicker by skipping setup if the bootloader has done it */ + if (mipi_dbi_display_is_on(reg)) + return 0; + + lcdreg_reset(reg); + ret = lcdreg_writereg(reg, MIPI_DCS_SOFT_RESET); + if (ret) { + dev_err(tdev->base->dev, "Error writing lcdreg %d\n", ret); + return ret; + } + + msleep(20); + + /* Undocumented registers */ + lcdreg_writereg(reg, 0xEF, 0x03, 0x80, 0x02); + lcdreg_writereg(reg, 0xCF, 0x00, 0xC1, 0x30); + lcdreg_writereg(reg, 0xED, 0x64, 0x03, 0x12, 0x81); + lcdreg_writereg(reg, 0xE8, 0x85, 0x00, 0x78); + lcdreg_writereg(reg, 0xCB, 0x39, 0x2C, 0x00, 0x34, 0x02); + lcdreg_writereg(reg, 0xF7, 0x20); + lcdreg_writereg(reg, 0xEA, 0x00, 0x00); + + lcdreg_writereg(reg, ILI9340_PWCTRL1, 0x23); + lcdreg_writereg(reg, ILI9340_PWCTRL2, 0x10); + lcdreg_writereg(reg, ILI9340_VMCTRL1, 0x3e, 0x28); + lcdreg_writereg(reg, ILI9340_VMCTRL2, 0x86); + + lcdreg_writereg(reg, MIPI_DCS_SET_PIXEL_FORMAT, 0x55); + lcdreg_writereg(reg, ILI9340_FRMCTR1, 0x00, 0x18); + lcdreg_writereg(reg, ILI9340_DISCTRL, 0x08, 0x82, 0x27); + + /* 3Gamma Function Disable */ + lcdreg_writereg(reg, 0xF2, 0x00); + + lcdreg_writereg(reg, MIPI_DCS_SET_GAMMA_CURVE, 0x01); + lcdreg_writereg(reg, ILI9340_PGAMCTRL, + 0x0F, 0x31, 0x2B, 0x0C, 0x0E, 0x08, 0x4E, 0xF1, + 0x37, 0x07, 0x10, 0x03, 0x0E, 0x09, 0x00); + lcdreg_writereg(reg, ILI9340_NGAMCTRL, + 0x00, 0x0E, 0x14, 0x03, 0x11, 0x07, 0x31, 0xC1, + 0x48, 0x08, 0x0F, 0x0C, 0x31, 0x36, 0x0F); + + switch (adafruit_tft_get_rotation(reg->dev)) { + default: + addr_mode = ILI9340_MADCTL_MV | ILI9340_MADCTL_MY | + ILI9340_MADCTL_MX; + break; + case 90: + addr_mode = ILI9340_MADCTL_MY; + break; + case 180: + addr_mode = ILI9340_MADCTL_MV; + break; + case 270: + addr_mode = ILI9340_MADCTL_MX; + break; + } + addr_mode |= ILI9340_MADCTL_BGR; + lcdreg_writereg(reg, MIPI_DCS_SET_ADDRESS_MODE, addr_mode); + + lcdreg_writereg(reg, MIPI_DCS_EXIT_SLEEP_MODE); + msleep(120); + lcdreg_writereg(reg, MIPI_DCS_SET_DISPLAY_ON); + + mipi_dbi_debug_dump_regs(reg); + + return 0; +} + +struct drm_panel_funcs adafruit_tft_1601_funcs = { + .get_modes = tinydrm_panel_get_modes, + .prepare = adafruit_tft_1601_panel_prepare, + .unprepare = mipi_dbi_panel_unprepare, + .enable = tinydrm_panel_enable_backlight, + .disable = tinydrm_panel_disable_backlight, +}; + +static const struct of_device_id adafruit_tft_of_match[] = { + { .compatible = "adafruit,tft1601", .data = (void *)ADAFRUIT_1601 }, + { .compatible = "adafruit,tft797", .data = (void *)ADAFRUIT_797 }, + { .compatible = "adafruit,tft358", .data = (void *)ADAFRUIT_358 }, + {}, +}; +MODULE_DEVICE_TABLE(of, adafruit_tft_of_match); + +static const struct spi_device_id adafruit_tft_id[] = { + { "tft1601", ADAFRUIT_1601 }, + { "tft797", ADAFRUIT_797 }, + { "tft358", ADAFRUIT_358 }, + { }, +}; +MODULE_DEVICE_TABLE(spi, adafruit_tft_id); + +TINYDRM_DRM_DRIVER(adafruit_tft, "adafruit-tft", "Adafruit TFT", "20160317"); + +static int adafruit_tft_probe(struct spi_device *spi) +{ + const struct of_device_id *of_id; + struct lcdreg_spi_config cfg = { + .mode = LCDREG_SPI_4WIRE, + }; + struct device *dev = &spi->dev; + struct tinydrm_device *tdev; + bool readable = false; + struct lcdreg *reg; + int id, ret; + + of_id = of_match_device(adafruit_tft_of_match, dev); + if (of_id) { + id = (int)of_id->data; + } else { + const struct spi_device_id *spi_id = spi_get_device_id(spi); + + if (!spi_id) + return -EINVAL; + + id = spi_id->driver_data; + } + + tdev = devm_kzalloc(dev, sizeof(*tdev), GFP_KERNEL); + if (!tdev) + return -ENOMEM; + + tdev->backlight = tinydrm_of_find_backlight(dev); + if (IS_ERR(tdev->backlight)) + return PTR_ERR(tdev->backlight); + + tdev->regulator = devm_regulator_get_optional(dev, "power"); + if (IS_ERR(tdev->regulator)) { + if (PTR_ERR(tdev->regulator) != -ENODEV) + return PTR_ERR(tdev->regulator); + tdev->regulator = NULL; + } + + switch (id) { + case ADAFRUIT_1601: + readable = true; + cfg.mode = LCDREG_SPI_4WIRE; + tdev->width = 320; + tdev->height = 240; + tdev->panel.funcs = &adafruit_tft_1601_funcs; + break; + case ADAFRUIT_797: + cfg.mode = LCDREG_SPI_3WIRE; + tdev->width = 176; + tdev->height = 220; + /* TODO: tdev->panel.funcs = &adafruit_tft_797_funcs*/ + break; + case ADAFRUIT_358: + tdev->width = 128; + tdev->height = 160; + /* TODO: tdev->panel.funcs = &adafruit_tft_358_funcs */ + break; + default: + return -EINVAL; + } + + DRM_DEBUG_DRIVER("rotation = %u\n", adafruit_tft_get_rotation(dev)); + switch (adafruit_tft_get_rotation(dev)) { + case 90: + case 270: + swap(tdev->width, tdev->height); + break; + } + + reg = devm_lcdreg_spi_init(spi, &cfg); + if (IS_ERR(reg)) + return PTR_ERR(reg); + + reg->readable = readable; + tdev->lcdreg = reg; + ret = mipi_dbi_init(dev, tdev); + if (ret) + return ret; + + /* TODO: Make configurable */ + tdev->fbdefio_delay_ms = 40; + + spi_set_drvdata(spi, tdev); + + return devm_tinydrm_register(dev, tdev, &adafruit_tft); +} + +static struct spi_driver adafruit_tft_spi_driver = { + .driver = { + .name = "adafruit-tft", + .owner = THIS_MODULE, + .of_match_table = adafruit_tft_of_match, + .pm = &tinydrm_simple_pm_ops, + }, + .id_table = adafruit_tft_id, + .probe = adafruit_tft_probe, + .shutdown = tinydrm_spi_shutdown, +}; +module_spi_driver(adafruit_tft_spi_driver); + +MODULE_DESCRIPTION("Adafruit MIPI compatible SPI displays"); +MODULE_AUTHOR("Noralf Trønnes"); +MODULE_LICENSE("GPL"); diff --git a/include/drm/tinydrm/ili9340.h b/include/drm/tinydrm/ili9340.h new file mode 100644 index 0000000..c851c41 --- /dev/null +++ b/include/drm/tinydrm/ili9340.h @@ -0,0 +1,47 @@ +/* + * ILI9340 LCD controller + * + * Copyright 2016 Noralf Trønnes + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ + +#ifndef __LINUX_ILI9340_H +#define __LINUX_ILI9340_H + +#define ILI9340_FRMCTR1 0xB1 +#define ILI9340_FRMCTR2 0xB2 +#define ILI9340_FRMCTR3 0xB3 +#define ILI9340_INVTR 0xB4 +#define ILI9340_DISCTRL 0xB6 + +#define ILI9340_PWCTRL1 0xC0 +#define ILI9340_PWCTRL2 0xC1 +#define ILI9340_PWCTRL3 0xC2 +#define ILI9340_PWCTRL4 0xC3 +#define ILI9340_PWCTRL5 0xC4 +#define ILI9340_VMCTRL1 0xC5 +#define ILI9340_VMCTRL2 0xC7 + +#define ILI9340_RDID1 0xDA +#define ILI9340_RDID2 0xDB +#define ILI9340_RDID3 0xDC +#define ILI9340_RDID4 0xDD + +#define ILI9340_PGAMCTRL 0xE0 +#define ILI9340_NGAMCTRL 0xE1 + +#define ILI9340_IFCTL 0xF6 + +#define ILI9340_MADCTL_MH BIT(2) +#define ILI9340_MADCTL_BGR BIT(3) +#define ILI9340_MADCTL_ML BIT(4) +#define ILI9340_MADCTL_MV BIT(5) +#define ILI9340_MADCTL_MX BIT(6) +#define ILI9340_MADCTL_MY BIT(7) + + +#endif /* __LINUX_ILI9340_H */