// SPDX-License-Identifier: GPL-2.0+/* * DRM driver for Ilitek ILI9486 panels * * Copyright 2020 Kamlesh Gurudasani <kamlesh.gurudasani@gmail.com> */ #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 <video/mipi_display.h> #include <drm/clients/drm_client_setup.h>#include <drm/drm_atomic_helper.h>#include <drm/drm_drv.h>#include <drm/drm_fbdev_dma.h>#include <drm/drm_gem_atomic_helper.h>#include <drm/drm_gem_dma_helper.h>#include <drm/drm_managed.h>#include <drm/drm_mipi_dbi.h>#include <drm/drm_modeset_helper.h>#include <drm/drm_print.h> #define ILI9486_ITFCTR1         0xb0#define ILI9486_PWCTRL1         0xc2#define ILI9486_VMCTRL1         0xc5#define ILI9486_PGAMCTRL        0xe0#define ILI9486_NGAMCTRL        0xe1#define ILI9486_DGAMCTRL        0xe2#define ILI9486_MADCTL_BGR      BIT(3)#define ILI9486_MADCTL_MV       BIT(5)#define ILI9486_MADCTL_MX       BIT(6)#define ILI9486_MADCTL_MY       BIT(7) struct ili9486_device {	struct mipi_dbi_dev dbidev; 	struct drm_plane plane;	struct drm_crtc crtc;	struct drm_encoder encoder;	struct drm_connector connector;}; static struct ili9486_device *to_ili9486_device(struct drm_device *dev){	return container_of(drm_to_mipi_dbi_dev(dev), struct ili9486_device, dbidev);} /* * The PiScreen/waveshare rpi-lcd-35 has a SPI to 16-bit parallel bus converter * in front of the  display controller. This means that 8-bit values have to be * transferred as 16-bit. */static int waveshare_command(struct mipi_dbi *mipi, u8 *cmd, u8 *par,			     size_t num){	struct spi_device *spi = mipi->spi;	unsigned int bpw = 8;	void *data = par;	u32 speed_hz;	int i, ret;	__be16 *buf; 	buf = kmalloc(32 * sizeof(u16), GFP_KERNEL);	if (!buf)		return -ENOMEM; 	/*	 * The displays are Raspberry Pi HATs and connected to the 8-bit only	 * SPI controller, so 16-bit command and parameters need byte swapping	 * before being transferred as 8-bit on the big endian SPI bus.	 */	buf[0] = cpu_to_be16(*cmd);	spi_bus_lock(spi->controller);	gpiod_set_value_cansleep(mipi->dc, 0);	speed_hz = mipi_dbi_spi_cmd_max_speed(spi, 2);	ret = mipi_dbi_spi_transfer(spi, speed_hz, 8, buf, 2);	spi_bus_unlock(spi->controller);	if (ret || !num)		goto free; 	/* 8-bit configuration data, not 16-bit pixel data */	if (num <= 32) {		for (i = 0; i < num; i++)			buf[i] = cpu_to_be16(par[i]);		num *= 2;		data = buf;	} 	/*	 * Check whether pixel data bytes needs to be swapped or not	 */	if (*cmd == MIPI_DCS_WRITE_MEMORY_START && !mipi->swap_bytes)		bpw = 16; 	spi_bus_lock(spi->controller);	gpiod_set_value_cansleep(mipi->dc, 1);	speed_hz = mipi_dbi_spi_cmd_max_speed(spi, num);	ret = mipi_dbi_spi_transfer(spi, speed_hz, bpw, data, num);	spi_bus_unlock(spi->controller); free:	kfree(buf); 	return ret;} static const u32 ili9486_plane_formats[] = {	DRM_MIPI_DBI_PLANE_FORMATS,}; static const u64 ili9486_plane_format_modifiers[] = {	DRM_MIPI_DBI_PLANE_FORMAT_MODIFIERS,}; static const struct drm_plane_helper_funcs ili9486_plane_helper_funcs = {	DRM_MIPI_DBI_PLANE_HELPER_FUNCS,}; static const struct drm_plane_funcs ili9486_plane_funcs = {	DRM_MIPI_DBI_PLANE_FUNCS,	.destroy = drm_plane_cleanup,}; static void ili9486_crtc_helper_atomic_enable(struct drm_crtc *crtc,					      struct drm_atomic_commit *state){	struct drm_device *drm = crtc->dev;	struct ili9486_device *ili9486 = to_ili9486_device(drm);	struct mipi_dbi_dev *dbidev = &ili9486->dbidev;	struct mipi_dbi *dbi = &dbidev->dbi;	u8 addr_mode;	int ret, idx; 	if (!drm_dev_enter(drm, &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; 	mipi_dbi_command(dbi, ILI9486_ITFCTR1);	mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE);	msleep(250); 	mipi_dbi_command(dbi, MIPI_DCS_SET_PIXEL_FORMAT, 0x55); 	mipi_dbi_command(dbi, ILI9486_PWCTRL1, 0x44); 	mipi_dbi_command(dbi, ILI9486_VMCTRL1, 0x00, 0x00, 0x00, 0x00); 	mipi_dbi_command(dbi, ILI9486_PGAMCTRL,			 0x0F, 0x1F, 0x1C, 0x0C, 0x0F, 0x08, 0x48, 0x98,			 0x37, 0x0A, 0x13, 0x04, 0x11, 0x0D, 0x0);	mipi_dbi_command(dbi, ILI9486_NGAMCTRL,			 0x0F, 0x32, 0x2E, 0x0B, 0x0D, 0x05, 0x47, 0x75,			 0x37, 0x06, 0x10, 0x03, 0x24, 0x20, 0x00);	mipi_dbi_command(dbi, ILI9486_DGAMCTRL,			 0x0F, 0x32, 0x2E, 0x0B, 0x0D, 0x05, 0x47, 0x75,			 0x37, 0x06, 0x10, 0x03, 0x24, 0x20, 0x00); 	mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON);	msleep(100);  out_enable:	switch (dbidev->rotation) {	case 90:		addr_mode = ILI9486_MADCTL_MY;		break;	case 180:		addr_mode = ILI9486_MADCTL_MV;		break;	case 270:		addr_mode = ILI9486_MADCTL_MX;		break;	default:		addr_mode = ILI9486_MADCTL_MV | ILI9486_MADCTL_MY |			ILI9486_MADCTL_MX;		break;	}	addr_mode |= ILI9486_MADCTL_BGR;	mipi_dbi_command(dbi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode); 	backlight_enable(dbidev->backlight); out_exit:	drm_dev_exit(idx);} static const struct drm_crtc_helper_funcs ili9486_crtc_helper_funcs = {	DRM_MIPI_DBI_CRTC_HELPER_FUNCS,	.atomic_enable = ili9486_crtc_helper_atomic_enable,}; static const struct drm_crtc_funcs ili9486_crtc_funcs = {	DRM_MIPI_DBI_CRTC_FUNCS,	.destroy = drm_crtc_cleanup,}; static const struct drm_encoder_funcs ili9486_encoder_funcs = {	.destroy = drm_encoder_cleanup,}; static const struct drm_connector_helper_funcs ili9486_connector_helper_funcs = {	DRM_MIPI_DBI_CONNECTOR_HELPER_FUNCS,}; static const struct drm_connector_funcs ili9486_connector_funcs = {	DRM_MIPI_DBI_CONNECTOR_FUNCS,	.destroy = drm_connector_cleanup,}; static const struct drm_mode_config_helper_funcs ili9486_mode_config_helper_funcs = {	DRM_MIPI_DBI_MODE_CONFIG_HELPER_FUNCS,}; static const struct drm_mode_config_funcs ili9486_mode_config_funcs = {	DRM_MIPI_DBI_MODE_CONFIG_FUNCS,}; static const struct drm_display_mode waveshare_mode = {	DRM_SIMPLE_MODE(480, 320, 73, 49),}; DEFINE_DRM_GEM_DMA_FOPS(ili9486_fops); static const struct drm_driver ili9486_driver = {	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,	.fops			= &ili9486_fops,	DRM_GEM_DMA_DRIVER_OPS_VMAP,	DRM_FBDEV_DMA_DRIVER_OPS,	.debugfs_init		= mipi_dbi_debugfs_init,	.name			= "ili9486",	.desc			= "Ilitek ILI9486",	.major			= 1,	.minor			= 0,}; static const struct of_device_id ili9486_of_match[] = {	{ .compatible = "waveshare,rpi-lcd-35" },	{ .compatible = "ozzmaker,piscreen" },	{},};MODULE_DEVICE_TABLE(of, ili9486_of_match); static const struct spi_device_id ili9486_id[] = {	{ "ili9486", 0 },	{ "rpi-lcd-35", 0 },	{ "piscreen", 0 },	{ }};MODULE_DEVICE_TABLE(spi, ili9486_id); static int ili9486_probe(struct spi_device *spi){	struct device *dev = &spi->dev;	struct ili9486_device *ili9486;	struct mipi_dbi_dev *dbidev;	struct drm_device *drm;	struct mipi_dbi *dbi;	struct gpio_desc *dc;	struct drm_plane *plane;	struct drm_crtc *crtc;	struct drm_encoder *encoder;	struct drm_connector *connector;	u32 rotation = 0;	int ret; 	ili9486 = devm_drm_dev_alloc(dev, &ili9486_driver, struct ili9486_device, dbidev.drm);	if (IS_ERR(ili9486))		return PTR_ERR(ili9486);	dbidev = &ili9486->dbidev;	dbi = &dbidev->dbi;	drm = &dbidev->drm; 	dbi->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);	if (IS_ERR(dbi->reset))		return dev_err_probe(dev, PTR_ERR(dbi->reset), "Failed to get GPIO 'reset'\n"); 	dc = devm_gpiod_get(dev, "dc", GPIOD_OUT_LOW);	if (IS_ERR(dc))		return dev_err_probe(dev, PTR_ERR(dc), "Failed to get GPIO 'dc'\n"); 	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; 	dbi->command = waveshare_command;	dbi->read_commands = NULL; 	ret = drm_mipi_dbi_dev_init(dbidev, &waveshare_mode, ili9486_plane_formats[0],				    rotation, 0);	if (ret)		return ret; 	ret = drmm_mode_config_init(drm);	if (ret)		return ret; 	drm->mode_config.min_width = dbidev->mode.hdisplay;	drm->mode_config.max_width = dbidev->mode.hdisplay;	drm->mode_config.min_height = dbidev->mode.vdisplay;	drm->mode_config.max_height = dbidev->mode.vdisplay;	drm->mode_config.funcs = &ili9486_mode_config_funcs;	drm->mode_config.preferred_depth = 16;	drm->mode_config.helper_private = &ili9486_mode_config_helper_funcs; 	plane = &ili9486->plane;	ret = drm_universal_plane_init(drm, plane, 0, &ili9486_plane_funcs,				       ili9486_plane_formats, ARRAY_SIZE(ili9486_plane_formats),				       ili9486_plane_format_modifiers,				       DRM_PLANE_TYPE_PRIMARY, NULL);	if (ret)		return ret;	drm_plane_helper_add(plane, &ili9486_plane_helper_funcs);	drm_plane_enable_fb_damage_clips(plane); 	crtc = &ili9486->crtc;	ret = drm_crtc_init_with_planes(drm, crtc, plane, NULL, &ili9486_crtc_funcs, NULL);	if (ret)		return ret;	drm_crtc_helper_add(crtc, &ili9486_crtc_helper_funcs); 	encoder = &ili9486->encoder;	ret = drm_encoder_init(drm, encoder, &ili9486_encoder_funcs, DRM_MODE_ENCODER_NONE, NULL);	if (ret)		return ret;	encoder->possible_crtcs = drm_crtc_mask(crtc); 	connector = &ili9486->connector;	ret = drm_connector_init(drm, connector, &ili9486_connector_funcs,				 DRM_MODE_CONNECTOR_SPI);	if (ret)		return ret;	drm_connector_helper_add(connector, &ili9486_connector_helper_funcs); 	ret = drm_connector_attach_encoder(connector, encoder);	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_client_setup(drm, NULL); 	return 0;} static void ili9486_remove(struct spi_device *spi){	struct drm_device *drm = spi_get_drvdata(spi); 	drm_dev_unplug(drm);	drm_atomic_helper_shutdown(drm);} static void ili9486_shutdown(struct spi_device *spi){	drm_atomic_helper_shutdown(spi_get_drvdata(spi));} static struct spi_driver ili9486_spi_driver = {	.driver = {		.name = "ili9486",		.of_match_table = ili9486_of_match,	},	.id_table = ili9486_id,	.probe = ili9486_probe,	.remove = ili9486_remove,	.shutdown = ili9486_shutdown,};module_spi_driver(ili9486_spi_driver); MODULE_DESCRIPTION("Ilitek ILI9486 DRM driver");MODULE_AUTHOR("Kamlesh Gurudasani <kamlesh.gurudasani@gmail.com>");MODULE_LICENSE("GPL");