diff options
Diffstat (limited to 'drivers/gpu/drm/tiny/hx8357d.c')
| -rw-r--r-- | drivers/gpu/drm/tiny/hx8357d.c | 304 |
1 files changed, 304 insertions, 0 deletions
diff --git a/drivers/gpu/drm/tiny/hx8357d.c b/drivers/gpu/drm/tiny/hx8357d.c new file mode 100644 index 000000000000..9af8ff84974f --- /dev/null +++ b/drivers/gpu/drm/tiny/hx8357d.c @@ -0,0 +1,304 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * DRM driver for the HX8357D LCD controller + * + * Copyright 2018 Broadcom + * Copyright 2018 David Lechner <david@lechnology.com> + * Copyright 2016 Noralf Trønnes + * Copyright (C) 2015 Adafruit Industries + * Copyright (C) 2013 Christian Vogelgsang + */ + +#include <linux/backlight.h> +#include <linux/delay.h> +#include <linux/gpio/consumer.h> +#include <linux/module.h> +#include <linux/property.h> +#include <linux/spi/spi.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> +#include <drm/drm_modeset_helper.h> +#include <video/mipi_display.h> + +#define HX8357D_SETOSC 0xb0 +#define HX8357D_SETPOWER 0xb1 +#define HX8357D_SETRGB 0xb3 +#define HX8357D_SETCYC 0xb3 +#define HX8357D_SETCOM 0xb6 +#define HX8357D_SETEXTC 0xb9 +#define HX8357D_SETSTBA 0xc0 +#define HX8357D_SETPANEL 0xcc +#define HX8357D_SETGAMMA 0xe0 + +#define HX8357D_MADCTL_MY 0x80 +#define HX8357D_MADCTL_MX 0x40 +#define HX8357D_MADCTL_MV 0x20 +#define HX8357D_MADCTL_ML 0x10 +#define HX8357D_MADCTL_RGB 0x00 +#define HX8357D_MADCTL_BGR 0x08 +#define HX8357D_MADCTL_MH 0x04 + +static void yx240qv29_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; + u8 addr_mode; + int ret, idx; + + if (!drm_dev_enter(pipe->crtc.dev, &idx)) + return; + + DRM_DEBUG_KMS("\n"); + + ret = mipi_dbi_poweron_conditional_reset(dbidev); + if (ret < 0) + goto out_exit; + if (ret == 1) + goto out_enable; + + /* setextc */ + mipi_dbi_command(dbi, HX8357D_SETEXTC, 0xFF, 0x83, 0x57); + msleep(150); + + /* setRGB which also enables SDO */ + mipi_dbi_command(dbi, HX8357D_SETRGB, 0x00, 0x00, 0x06, 0x06); + + /* -1.52V */ + mipi_dbi_command(dbi, HX8357D_SETCOM, 0x25); + + /* Normal mode 70Hz, Idle mode 55 Hz */ + mipi_dbi_command(dbi, HX8357D_SETOSC, 0x68); + + /* Set Panel - BGR, Gate direction swapped */ + mipi_dbi_command(dbi, HX8357D_SETPANEL, 0x05); + + mipi_dbi_command(dbi, HX8357D_SETPOWER, + 0x00, /* Not deep standby */ + 0x15, /* BT */ + 0x1C, /* VSPR */ + 0x1C, /* VSNR */ + 0x83, /* AP */ + 0xAA); /* FS */ + + mipi_dbi_command(dbi, HX8357D_SETSTBA, + 0x50, /* OPON normal */ + 0x50, /* OPON idle */ + 0x01, /* STBA */ + 0x3C, /* STBA */ + 0x1E, /* STBA */ + 0x08); /* GEN */ + + mipi_dbi_command(dbi, HX8357D_SETCYC, + 0x02, /* NW 0x02 */ + 0x40, /* RTN */ + 0x00, /* DIV */ + 0x2A, /* DUM */ + 0x2A, /* DUM */ + 0x0D, /* GDON */ + 0x78); /* GDOFF */ + + mipi_dbi_command(dbi, HX8357D_SETGAMMA, + 0x02, + 0x0A, + 0x11, + 0x1d, + 0x23, + 0x35, + 0x41, + 0x4b, + 0x4b, + 0x42, + 0x3A, + 0x27, + 0x1B, + 0x08, + 0x09, + 0x03, + 0x02, + 0x0A, + 0x11, + 0x1d, + 0x23, + 0x35, + 0x41, + 0x4b, + 0x4b, + 0x42, + 0x3A, + 0x27, + 0x1B, + 0x08, + 0x09, + 0x03, + 0x00, + 0x01); + + /* 16 bit */ + mipi_dbi_command(dbi, MIPI_DCS_SET_PIXEL_FORMAT, + MIPI_DCS_PIXEL_FMT_16BIT); + + /* TE off */ + mipi_dbi_command(dbi, MIPI_DCS_SET_TEAR_ON, 0x00); + + /* tear line */ + mipi_dbi_command(dbi, MIPI_DCS_SET_TEAR_SCANLINE, 0x00, 0x02); + + /* Exit Sleep */ + mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE); + msleep(150); + + /* display on */ + mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON); + usleep_range(5000, 7000); + +out_enable: + switch (dbidev->rotation) { + default: + addr_mode = HX8357D_MADCTL_MX | HX8357D_MADCTL_MY; + break; + case 90: + addr_mode = HX8357D_MADCTL_MV | HX8357D_MADCTL_MY; + break; + case 180: + addr_mode = 0; + break; + case 270: + addr_mode = HX8357D_MADCTL_MV | HX8357D_MADCTL_MX; + break; + } + mipi_dbi_command(dbi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode); + mipi_dbi_enable_flush(dbidev, crtc_state, plane_state); +out_exit: + drm_dev_exit(idx); +} + +static const struct drm_simple_display_pipe_funcs hx8357d_pipe_funcs = { + .enable = yx240qv29_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 yx350hv15_mode = { + DRM_SIMPLE_MODE(320, 480, 60, 75), +}; + +DEFINE_DRM_GEM_CMA_FOPS(hx8357d_fops); + +static struct drm_driver hx8357d_driver = { + .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC, + .fops = &hx8357d_fops, + .release = mipi_dbi_release, + DRM_GEM_CMA_VMAP_DRIVER_OPS, + .debugfs_init = mipi_dbi_debugfs_init, + .name = "hx8357d", + .desc = "HX8357D", + .date = "20181023", + .major = 1, + .minor = 0, +}; + +static const struct of_device_id hx8357d_of_match[] = { + { .compatible = "adafruit,yx350hv15" }, + { } +}; +MODULE_DEVICE_TABLE(of, hx8357d_of_match); + +static const struct spi_device_id hx8357d_id[] = { + { "yx350hv15", 0 }, + { } +}; +MODULE_DEVICE_TABLE(spi, hx8357d_id); + +static int hx8357d_probe(struct spi_device *spi) +{ + struct device *dev = &spi->dev; + struct mipi_dbi_dev *dbidev; + struct drm_device *drm; + struct gpio_desc *dc; + u32 rotation = 0; + int ret; + + dbidev = kzalloc(sizeof(*dbidev), GFP_KERNEL); + if (!dbidev) + return -ENOMEM; + + drm = &dbidev->drm; + ret = devm_drm_dev_init(dev, drm, &hx8357d_driver); + if (ret) { + kfree(dbidev); + return ret; + } + + drm_mode_config_init(drm); + + 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, &dbidev->dbi, dc); + if (ret) + return ret; + + ret = mipi_dbi_dev_init(dbidev, &hx8357d_pipe_funcs, &yx350hv15_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 hx8357d_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 hx8357d_shutdown(struct spi_device *spi) +{ + drm_atomic_helper_shutdown(spi_get_drvdata(spi)); +} + +static struct spi_driver hx8357d_spi_driver = { + .driver = { + .name = "hx8357d", + .of_match_table = hx8357d_of_match, + }, + .id_table = hx8357d_id, + .probe = hx8357d_probe, + .remove = hx8357d_remove, + .shutdown = hx8357d_shutdown, +}; +module_spi_driver(hx8357d_spi_driver); + +MODULE_DESCRIPTION("HX8357D DRM driver"); +MODULE_AUTHOR("Eric Anholt <eric@anholt.net>"); +MODULE_LICENSE("GPL"); |