1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * DRM driver for Ilitek ILI9341 panels
4 *
5 * Copyright 2018 David Lechner <david@lechnology.com>
6 *
7 * Based on mi0283qt.c:
8 * Copyright 2016 Noralf Tr��nnes
9 */
10
11#include <linux/backlight.h>
12#include <linux/delay.h>
13#include <linux/gpio/consumer.h>
14#include <linux/module.h>
15#include <linux/property.h>
16#include <linux/spi/spi.h>
17
18#include <drm/drm_atomic_helper.h>
19#include <drm/drm_drv.h>
20#include <drm/drm_fbdev_generic.h>
21#include <drm/drm_gem_atomic_helper.h>
22#include <drm/drm_gem_dma_helper.h>
23#include <drm/drm_managed.h>
24#include <drm/drm_mipi_dbi.h>
25#include <drm/drm_modeset_helper.h>
26#include <video/mipi_display.h>
27
28#define ILI9341_FRMCTR1		0xb1
29#define ILI9341_DISCTRL		0xb6
30#define ILI9341_ETMOD		0xb7
31
32#define ILI9341_PWCTRL1		0xc0
33#define ILI9341_PWCTRL2		0xc1
34#define ILI9341_VMCTRL1		0xc5
35#define ILI9341_VMCTRL2		0xc7
36#define ILI9341_PWCTRLA		0xcb
37#define ILI9341_PWCTRLB		0xcf
38
39#define ILI9341_PGAMCTRL	0xe0
40#define ILI9341_NGAMCTRL	0xe1
41#define ILI9341_DTCTRLA		0xe8
42#define ILI9341_DTCTRLB		0xea
43#define ILI9341_PWRSEQ		0xed
44
45#define ILI9341_EN3GAM		0xf2
46#define ILI9341_PUMPCTRL	0xf7
47
48#define ILI9341_MADCTL_BGR	BIT(3)
49#define ILI9341_MADCTL_MV	BIT(5)
50#define ILI9341_MADCTL_MX	BIT(6)
51#define ILI9341_MADCTL_MY	BIT(7)
52
53static void yx240qv29_enable(struct drm_simple_display_pipe *pipe,
54			     struct drm_crtc_state *crtc_state,
55			     struct drm_plane_state *plane_state)
56{
57	struct mipi_dbi_dev *dbidev = drm_to_mipi_dbi_dev(pipe->crtc.dev);
58	struct mipi_dbi *dbi = &dbidev->dbi;
59	u8 addr_mode;
60	int ret, idx;
61
62	if (!drm_dev_enter(pipe->crtc.dev, &idx))
63		return;
64
65	DRM_DEBUG_KMS("\n");
66
67	ret = mipi_dbi_poweron_conditional_reset(dbidev);
68	if (ret < 0)
69		goto out_exit;
70	if (ret == 1)
71		goto out_enable;
72
73	mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_OFF);
74
75	mipi_dbi_command(dbi, ILI9341_PWCTRLB, 0x00, 0xc1, 0x30);
76	mipi_dbi_command(dbi, ILI9341_PWRSEQ, 0x64, 0x03, 0x12, 0x81);
77	mipi_dbi_command(dbi, ILI9341_DTCTRLA, 0x85, 0x00, 0x78);
78	mipi_dbi_command(dbi, ILI9341_PWCTRLA, 0x39, 0x2c, 0x00, 0x34, 0x02);
79	mipi_dbi_command(dbi, ILI9341_PUMPCTRL, 0x20);
80	mipi_dbi_command(dbi, ILI9341_DTCTRLB, 0x00, 0x00);
81
82	/* Power Control */
83	mipi_dbi_command(dbi, ILI9341_PWCTRL1, 0x23);
84	mipi_dbi_command(dbi, ILI9341_PWCTRL2, 0x10);
85	/* VCOM */
86	mipi_dbi_command(dbi, ILI9341_VMCTRL1, 0x3e, 0x28);
87	mipi_dbi_command(dbi, ILI9341_VMCTRL2, 0x86);
88
89	/* Memory Access Control */
90	mipi_dbi_command(dbi, MIPI_DCS_SET_PIXEL_FORMAT, MIPI_DCS_PIXEL_FMT_16BIT);
91
92	/* Frame Rate */
93	mipi_dbi_command(dbi, ILI9341_FRMCTR1, 0x00, 0x1b);
94
95	/* Gamma */
96	mipi_dbi_command(dbi, ILI9341_EN3GAM, 0x00);
97	mipi_dbi_command(dbi, MIPI_DCS_SET_GAMMA_CURVE, 0x01);
98	mipi_dbi_command(dbi, ILI9341_PGAMCTRL,
99			 0x0f, 0x31, 0x2b, 0x0c, 0x0e, 0x08, 0x4e, 0xf1,
100			 0x37, 0x07, 0x10, 0x03, 0x0e, 0x09, 0x00);
101	mipi_dbi_command(dbi, ILI9341_NGAMCTRL,
102			 0x00, 0x0e, 0x14, 0x03, 0x11, 0x07, 0x31, 0xc1,
103			 0x48, 0x08, 0x0f, 0x0c, 0x31, 0x36, 0x0f);
104
105	/* DDRAM */
106	mipi_dbi_command(dbi, ILI9341_ETMOD, 0x07);
107
108	/* Display */
109	mipi_dbi_command(dbi, ILI9341_DISCTRL, 0x08, 0x82, 0x27, 0x00);
110	mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE);
111	msleep(100);
112
113	mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON);
114	msleep(100);
115
116out_enable:
117	switch (dbidev->rotation) {
118	default:
119		addr_mode = ILI9341_MADCTL_MX;
120		break;
121	case 90:
122		addr_mode = ILI9341_MADCTL_MV;
123		break;
124	case 180:
125		addr_mode = ILI9341_MADCTL_MY;
126		break;
127	case 270:
128		addr_mode = ILI9341_MADCTL_MV | ILI9341_MADCTL_MY |
129			    ILI9341_MADCTL_MX;
130		break;
131	}
132	addr_mode |= ILI9341_MADCTL_BGR;
133	mipi_dbi_command(dbi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);
134	mipi_dbi_enable_flush(dbidev, crtc_state, plane_state);
135out_exit:
136	drm_dev_exit(idx);
137}
138
139static const struct drm_simple_display_pipe_funcs ili9341_pipe_funcs = {
140	DRM_MIPI_DBI_SIMPLE_DISPLAY_PIPE_FUNCS(yx240qv29_enable),
141};
142
143static const struct drm_display_mode yx240qv29_mode = {
144	DRM_SIMPLE_MODE(240, 320, 37, 49),
145};
146
147DEFINE_DRM_GEM_DMA_FOPS(ili9341_fops);
148
149static const struct drm_driver ili9341_driver = {
150	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
151	.fops			= &ili9341_fops,
152	DRM_GEM_DMA_DRIVER_OPS_VMAP,
153	.debugfs_init		= mipi_dbi_debugfs_init,
154	.name			= "ili9341",
155	.desc			= "Ilitek ILI9341",
156	.date			= "20180514",
157	.major			= 1,
158	.minor			= 0,
159};
160
161static const struct of_device_id ili9341_of_match[] = {
162	{ .compatible = "adafruit,yx240qv29" },
163	{ }
164};
165MODULE_DEVICE_TABLE(of, ili9341_of_match);
166
167static const struct spi_device_id ili9341_id[] = {
168	{ "yx240qv29", 0 },
169	{ }
170};
171MODULE_DEVICE_TABLE(spi, ili9341_id);
172
173static int ili9341_probe(struct spi_device *spi)
174{
175	struct device *dev = &spi->dev;
176	struct mipi_dbi_dev *dbidev;
177	struct drm_device *drm;
178	struct mipi_dbi *dbi;
179	struct gpio_desc *dc;
180	u32 rotation = 0;
181	int ret;
182
183	dbidev = devm_drm_dev_alloc(dev, &ili9341_driver,
184				    struct mipi_dbi_dev, drm);
185	if (IS_ERR(dbidev))
186		return PTR_ERR(dbidev);
187
188	dbi = &dbidev->dbi;
189	drm = &dbidev->drm;
190
191	dbi->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
192	if (IS_ERR(dbi->reset))
193		return dev_err_probe(dev, PTR_ERR(dbi->reset), "Failed to get GPIO 'reset'\n");
194
195	dc = devm_gpiod_get_optional(dev, "dc", GPIOD_OUT_LOW);
196	if (IS_ERR(dc))
197		return dev_err_probe(dev, PTR_ERR(dc), "Failed to get GPIO 'dc'\n");
198
199	dbidev->backlight = devm_of_find_backlight(dev);
200	if (IS_ERR(dbidev->backlight))
201		return PTR_ERR(dbidev->backlight);
202
203	device_property_read_u32(dev, "rotation", &rotation);
204
205	ret = mipi_dbi_spi_init(spi, dbi, dc);
206	if (ret)
207		return ret;
208
209	ret = mipi_dbi_dev_init(dbidev, &ili9341_pipe_funcs, &yx240qv29_mode, rotation);
210	if (ret)
211		return ret;
212
213	drm_mode_config_reset(drm);
214
215	ret = drm_dev_register(drm, 0);
216	if (ret)
217		return ret;
218
219	spi_set_drvdata(spi, drm);
220
221	drm_fbdev_generic_setup(drm, 0);
222
223	return 0;
224}
225
226static void ili9341_remove(struct spi_device *spi)
227{
228	struct drm_device *drm = spi_get_drvdata(spi);
229
230	drm_dev_unplug(drm);
231	drm_atomic_helper_shutdown(drm);
232}
233
234static void ili9341_shutdown(struct spi_device *spi)
235{
236	drm_atomic_helper_shutdown(spi_get_drvdata(spi));
237}
238
239static struct spi_driver ili9341_spi_driver = {
240	.driver = {
241		.name = "ili9341",
242		.of_match_table = ili9341_of_match,
243	},
244	.id_table = ili9341_id,
245	.probe = ili9341_probe,
246	.remove = ili9341_remove,
247	.shutdown = ili9341_shutdown,
248};
249module_spi_driver(ili9341_spi_driver);
250
251MODULE_DESCRIPTION("Ilitek ILI9341 DRM driver");
252MODULE_AUTHOR("David Lechner <david@lechnology.com>");
253MODULE_LICENSE("GPL");
254