diff options
Diffstat (limited to 'drivers/gpu/drm/tiny/st7735r.c')
| -rw-r--r-- | drivers/gpu/drm/tiny/st7735r.c | 246 |
1 files changed, 246 insertions, 0 deletions
diff --git a/drivers/gpu/drm/tiny/st7735r.c b/drivers/gpu/drm/tiny/st7735r.c new file mode 100644 index 000000000000..3f4487c71684 --- /dev/null +++ b/drivers/gpu/drm/tiny/st7735r.c @@ -0,0 +1,246 @@ +// 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/drm_mipi_dbi.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_dev *dbidev = drm_to_mipi_dbi_dev(pipe->crtc.dev); + struct mipi_dbi *dbi = &dbidev->dbi; + int ret, idx; + u8 addr_mode; + + if (!drm_dev_enter(pipe->crtc.dev, &idx)) + return; + + DRM_DEBUG_KMS("\n"); + + ret = mipi_dbi_poweron_reset(dbidev); + if (ret) + goto out_exit; + + msleep(150); + + mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE); + msleep(500); + + mipi_dbi_command(dbi, ST7735R_FRMCTR1, 0x01, 0x2c, 0x2d); + mipi_dbi_command(dbi, ST7735R_FRMCTR2, 0x01, 0x2c, 0x2d); + mipi_dbi_command(dbi, ST7735R_FRMCTR3, 0x01, 0x2c, 0x2d, 0x01, 0x2c, + 0x2d); + mipi_dbi_command(dbi, ST7735R_INVCTR, 0x07); + mipi_dbi_command(dbi, ST7735R_PWCTR1, 0xa2, 0x02, 0x84); + mipi_dbi_command(dbi, ST7735R_PWCTR2, 0xc5); + mipi_dbi_command(dbi, ST7735R_PWCTR3, 0x0a, 0x00); + mipi_dbi_command(dbi, ST7735R_PWCTR4, 0x8a, 0x2a); + mipi_dbi_command(dbi, ST7735R_PWCTR5, 0x8a, 0xee); + mipi_dbi_command(dbi, ST7735R_VMCTR1, 0x0e); + mipi_dbi_command(dbi, MIPI_DCS_EXIT_INVERT_MODE); + switch (dbidev->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(dbi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode); + mipi_dbi_command(dbi, MIPI_DCS_SET_PIXEL_FORMAT, + MIPI_DCS_PIXEL_FMT_16BIT); + mipi_dbi_command(dbi, ST7735R_GAMCTRP1, 0x02, 0x1c, 0x07, 0x12, 0x37, + 0x32, 0x29, 0x2d, 0x29, 0x25, 0x2b, 0x39, 0x00, 0x01, + 0x03, 0x10); + mipi_dbi_command(dbi, ST7735R_GAMCTRN1, 0x03, 0x1d, 0x07, 0x06, 0x2e, + 0x2c, 0x29, 0x2d, 0x2e, 0x2e, 0x37, 0x3f, 0x00, 0x00, + 0x02, 0x10); + mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON); + + msleep(100); + + mipi_dbi_command(dbi, MIPI_DCS_ENTER_NORMAL_MODE); + + msleep(20); + + mipi_dbi_enable_flush(dbidev, 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_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 mipi_dbi_dev *dbidev; + struct drm_device *drm; + struct mipi_dbi *dbi; + struct gpio_desc *dc; + u32 rotation = 0; + int ret; + + dbidev = kzalloc(sizeof(*dbidev), GFP_KERNEL); + if (!dbidev) + return -ENOMEM; + + dbi = &dbidev->dbi; + drm = &dbidev->drm; + ret = devm_drm_dev_init(dev, drm, &st7735r_driver); + if (ret) { + kfree(dbidev); + return ret; + } + + drm_mode_config_init(drm); + + dbi->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH); + if (IS_ERR(dbi->reset)) { + DRM_DEV_ERROR(dev, "Failed to get gpio 'reset'\n"); + return PTR_ERR(dbi->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); + } + + dbidev->backlight = devm_of_find_backlight(dev); + if (IS_ERR(dbidev->backlight)) + return PTR_ERR(dbidev->backlight); + + device_property_read_u32(dev, "rotation", &rotation); + + ret = mipi_dbi_spi_init(spi, dbi, dc); + if (ret) + return ret; + + /* Cannot read from Adafruit 1.8" display via SPI */ + dbi->read_commands = NULL; + + ret = mipi_dbi_dev_init(dbidev, &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, 0); + + 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"); |