1// SPDX-License-Identifier: GPL-2.0+
  2/*
  3 * DRM driver for Sitronix ST7735R panels
  4 *
  5 * Copyright 2017 David Lechner <david@lechnology.com>
  6 */
  7
  8#include <linux/backlight.h>
  9#include <linux/delay.h>
 10#include <linux/dma-buf.h>
 11#include <linux/gpio/consumer.h>
 12#include <linux/module.h>
 13#include <linux/property.h>
 14#include <linux/spi/spi.h>
 15#include <video/mipi_display.h>
 16
 17#include <drm/drm_atomic_helper.h>
 18#include <drm/drm_drv.h>
 19#include <drm/drm_fb_helper.h>
 20#include <drm/drm_gem_cma_helper.h>
 21#include <drm/drm_gem_framebuffer_helper.h>
 22#include <drm/drm_mipi_dbi.h>
 23
 24#define ST7735R_FRMCTR1		0xb1
 25#define ST7735R_FRMCTR2		0xb2
 26#define ST7735R_FRMCTR3		0xb3
 27#define ST7735R_INVCTR		0xb4
 28#define ST7735R_PWCTR1		0xc0
 29#define ST7735R_PWCTR2		0xc1
 30#define ST7735R_PWCTR3		0xc2
 31#define ST7735R_PWCTR4		0xc3
 32#define ST7735R_PWCTR5		0xc4
 33#define ST7735R_VMCTR1		0xc5
 34#define ST7735R_GAMCTRP1	0xe0
 35#define ST7735R_GAMCTRN1	0xe1
 36
 37#define ST7735R_MY	BIT(7)
 38#define ST7735R_MX	BIT(6)
 39#define ST7735R_MV	BIT(5)
 40
 41static void jd_t18003_t01_pipe_enable(struct drm_simple_display_pipe *pipe,
 42				      struct drm_crtc_state *crtc_state,
 43				      struct drm_plane_state *plane_state)
 44{
 45	struct mipi_dbi_dev *dbidev = drm_to_mipi_dbi_dev(pipe->crtc.dev);
 46	struct mipi_dbi *dbi = &dbidev->dbi;
 47	int ret, idx;
 48	u8 addr_mode;
 49
 50	if (!drm_dev_enter(pipe->crtc.dev, &idx))
 51		return;
 52
 53	DRM_DEBUG_KMS("\n");
 54
 55	ret = mipi_dbi_poweron_reset(dbidev);
 56	if (ret)
 57		goto out_exit;
 58
 59	msleep(150);
 60
 61	mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE);
 62	msleep(500);
 63
 64	mipi_dbi_command(dbi, ST7735R_FRMCTR1, 0x01, 0x2c, 0x2d);
 65	mipi_dbi_command(dbi, ST7735R_FRMCTR2, 0x01, 0x2c, 0x2d);
 66	mipi_dbi_command(dbi, ST7735R_FRMCTR3, 0x01, 0x2c, 0x2d, 0x01, 0x2c,
 67			 0x2d);
 68	mipi_dbi_command(dbi, ST7735R_INVCTR, 0x07);
 69	mipi_dbi_command(dbi, ST7735R_PWCTR1, 0xa2, 0x02, 0x84);
 70	mipi_dbi_command(dbi, ST7735R_PWCTR2, 0xc5);
 71	mipi_dbi_command(dbi, ST7735R_PWCTR3, 0x0a, 0x00);
 72	mipi_dbi_command(dbi, ST7735R_PWCTR4, 0x8a, 0x2a);
 73	mipi_dbi_command(dbi, ST7735R_PWCTR5, 0x8a, 0xee);
 74	mipi_dbi_command(dbi, ST7735R_VMCTR1, 0x0e);
 75	mipi_dbi_command(dbi, MIPI_DCS_EXIT_INVERT_MODE);
 76	switch (dbidev->rotation) {
 77	default:
 78		addr_mode = ST7735R_MX | ST7735R_MY;
 79		break;
 80	case 90:
 81		addr_mode = ST7735R_MX | ST7735R_MV;
 82		break;
 83	case 180:
 84		addr_mode = 0;
 85		break;
 86	case 270:
 87		addr_mode = ST7735R_MY | ST7735R_MV;
 88		break;
 89	}
 90	mipi_dbi_command(dbi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);
 91	mipi_dbi_command(dbi, MIPI_DCS_SET_PIXEL_FORMAT,
 92			 MIPI_DCS_PIXEL_FMT_16BIT);
 93	mipi_dbi_command(dbi, ST7735R_GAMCTRP1, 0x02, 0x1c, 0x07, 0x12, 0x37,
 94			 0x32, 0x29, 0x2d, 0x29, 0x25, 0x2b, 0x39, 0x00, 0x01,
 95			 0x03, 0x10);
 96	mipi_dbi_command(dbi, ST7735R_GAMCTRN1, 0x03, 0x1d, 0x07, 0x06, 0x2e,
 97			 0x2c, 0x29, 0x2d, 0x2e, 0x2e, 0x37, 0x3f, 0x00, 0x00,
 98			 0x02, 0x10);
 99	mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON);
100
101	msleep(100);
102
103	mipi_dbi_command(dbi, MIPI_DCS_ENTER_NORMAL_MODE);
104
105	msleep(20);
106
107	mipi_dbi_enable_flush(dbidev, crtc_state, plane_state);
108out_exit:
109	drm_dev_exit(idx);
110}
111
112static const struct drm_simple_display_pipe_funcs jd_t18003_t01_pipe_funcs = {
113	.enable		= jd_t18003_t01_pipe_enable,
114	.disable	= mipi_dbi_pipe_disable,
115	.update		= mipi_dbi_pipe_update,
116	.prepare_fb	= drm_gem_fb_simple_display_pipe_prepare_fb,
117};
118
119static const struct drm_display_mode jd_t18003_t01_mode = {
120	DRM_SIMPLE_MODE(128, 160, 28, 35),
121};
122
123DEFINE_DRM_GEM_CMA_FOPS(st7735r_fops);
124
125static struct drm_driver st7735r_driver = {
126	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
127	.fops			= &st7735r_fops,
128	.release		= mipi_dbi_release,
129	DRM_GEM_CMA_VMAP_DRIVER_OPS,
130	.debugfs_init		= mipi_dbi_debugfs_init,
131	.name			= "st7735r",
132	.desc			= "Sitronix ST7735R",
133	.date			= "20171128",
134	.major			= 1,
135	.minor			= 0,
136};
137
138static const struct of_device_id st7735r_of_match[] = {
139	{ .compatible = "jianda,jd-t18003-t01" },
140	{ },
141};
142MODULE_DEVICE_TABLE(of, st7735r_of_match);
143
144static const struct spi_device_id st7735r_id[] = {
145	{ "jd-t18003-t01", 0 },
146	{ },
147};
148MODULE_DEVICE_TABLE(spi, st7735r_id);
149
150static int st7735r_probe(struct spi_device *spi)
151{
152	struct device *dev = &spi->dev;
153	struct mipi_dbi_dev *dbidev;
154	struct drm_device *drm;
155	struct mipi_dbi *dbi;
156	struct gpio_desc *dc;
157	u32 rotation = 0;
158	int ret;
159
160	dbidev = kzalloc(sizeof(*dbidev), GFP_KERNEL);
161	if (!dbidev)
162		return -ENOMEM;
163
164	dbi = &dbidev->dbi;
165	drm = &dbidev->drm;
166	ret = devm_drm_dev_init(dev, drm, &st7735r_driver);
167	if (ret) {
168		kfree(dbidev);
169		return ret;
170	}
171
172	drm_mode_config_init(drm);
173
174	dbi->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
175	if (IS_ERR(dbi->reset)) {
176		DRM_DEV_ERROR(dev, "Failed to get gpio 'reset'\n");
177		return PTR_ERR(dbi->reset);
178	}
179
180	dc = devm_gpiod_get(dev, "dc", GPIOD_OUT_LOW);
181	if (IS_ERR(dc)) {
182		DRM_DEV_ERROR(dev, "Failed to get gpio 'dc'\n");
183		return PTR_ERR(dc);
184	}
185
186	dbidev->backlight = devm_of_find_backlight(dev);
187	if (IS_ERR(dbidev->backlight))
188		return PTR_ERR(dbidev->backlight);
189
190	device_property_read_u32(dev, "rotation", &rotation);
191
192	ret = mipi_dbi_spi_init(spi, dbi, dc);
193	if (ret)
194		return ret;
195
196	/* Cannot read from Adafruit 1.8" display via SPI */
197	dbi->read_commands = NULL;
198
199	ret = mipi_dbi_dev_init(dbidev, &jd_t18003_t01_pipe_funcs, &jd_t18003_t01_mode, rotation);
200	if (ret)
201		return ret;
202
203	drm_mode_config_reset(drm);
204
205	ret = drm_dev_register(drm, 0);
206	if (ret)
207		return ret;
208
209	spi_set_drvdata(spi, drm);
210
211	drm_fbdev_generic_setup(drm, 0);
212
213	return 0;
214}
215
216static int st7735r_remove(struct spi_device *spi)
217{
218	struct drm_device *drm = spi_get_drvdata(spi);
219
220	drm_dev_unplug(drm);
221	drm_atomic_helper_shutdown(drm);
222
223	return 0;
224}
225
226static void st7735r_shutdown(struct spi_device *spi)
227{
228	drm_atomic_helper_shutdown(spi_get_drvdata(spi));
229}
230
231static struct spi_driver st7735r_spi_driver = {
232	.driver = {
233		.name = "st7735r",
234		.owner = THIS_MODULE,
235		.of_match_table = st7735r_of_match,
236	},
237	.id_table = st7735r_id,
238	.probe = st7735r_probe,
239	.remove = st7735r_remove,
240	.shutdown = st7735r_shutdown,
241};
242module_spi_driver(st7735r_spi_driver);
243
244MODULE_DESCRIPTION("Sitronix ST7735R DRM driver");
245MODULE_AUTHOR("David Lechner <david@lechnology.com>");
246MODULE_LICENSE("GPL");