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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * DRM driver for the HX8357D LCD controller
4 *
5 * Copyright 2018 Broadcom
6 * Copyright 2018 David Lechner <david@lechnology.com>
7 * Copyright 2016 Noralf Trønnes
8 * Copyright (C) 2015 Adafruit Industries
9 * Copyright (C) 2013 Christian Vogelgsang
10 */
11
12#include <linux/backlight.h>
13#include <linux/delay.h>
14#include <linux/gpio/consumer.h>
15#include <linux/module.h>
16#include <linux/property.h>
17#include <linux/spi/spi.h>
18
19#include <drm/drm_atomic_helper.h>
20#include <drm/drm_drv.h>
21#include <drm/drm_fb_helper.h>
22#include <drm/drm_gem_cma_helper.h>
23#include <drm/drm_gem_framebuffer_helper.h>
24#include <drm/drm_mipi_dbi.h>
25#include <drm/drm_modeset_helper.h>
26#include <video/mipi_display.h>
27
28#define HX8357D_SETOSC 0xb0
29#define HX8357D_SETPOWER 0xb1
30#define HX8357D_SETRGB 0xb3
31#define HX8357D_SETCYC 0xb3
32#define HX8357D_SETCOM 0xb6
33#define HX8357D_SETEXTC 0xb9
34#define HX8357D_SETSTBA 0xc0
35#define HX8357D_SETPANEL 0xcc
36#define HX8357D_SETGAMMA 0xe0
37
38#define HX8357D_MADCTL_MY 0x80
39#define HX8357D_MADCTL_MX 0x40
40#define HX8357D_MADCTL_MV 0x20
41#define HX8357D_MADCTL_ML 0x10
42#define HX8357D_MADCTL_RGB 0x00
43#define HX8357D_MADCTL_BGR 0x08
44#define HX8357D_MADCTL_MH 0x04
45
46static void yx240qv29_enable(struct drm_simple_display_pipe *pipe,
47 struct drm_crtc_state *crtc_state,
48 struct drm_plane_state *plane_state)
49{
50 struct mipi_dbi_dev *dbidev = drm_to_mipi_dbi_dev(pipe->crtc.dev);
51 struct mipi_dbi *dbi = &dbidev->dbi;
52 u8 addr_mode;
53 int ret, idx;
54
55 if (!drm_dev_enter(pipe->crtc.dev, &idx))
56 return;
57
58 DRM_DEBUG_KMS("\n");
59
60 ret = mipi_dbi_poweron_conditional_reset(dbidev);
61 if (ret < 0)
62 goto out_exit;
63 if (ret == 1)
64 goto out_enable;
65
66 /* setextc */
67 mipi_dbi_command(dbi, HX8357D_SETEXTC, 0xFF, 0x83, 0x57);
68 msleep(150);
69
70 /* setRGB which also enables SDO */
71 mipi_dbi_command(dbi, HX8357D_SETRGB, 0x00, 0x00, 0x06, 0x06);
72
73 /* -1.52V */
74 mipi_dbi_command(dbi, HX8357D_SETCOM, 0x25);
75
76 /* Normal mode 70Hz, Idle mode 55 Hz */
77 mipi_dbi_command(dbi, HX8357D_SETOSC, 0x68);
78
79 /* Set Panel - BGR, Gate direction swapped */
80 mipi_dbi_command(dbi, HX8357D_SETPANEL, 0x05);
81
82 mipi_dbi_command(dbi, HX8357D_SETPOWER,
83 0x00, /* Not deep standby */
84 0x15, /* BT */
85 0x1C, /* VSPR */
86 0x1C, /* VSNR */
87 0x83, /* AP */
88 0xAA); /* FS */
89
90 mipi_dbi_command(dbi, HX8357D_SETSTBA,
91 0x50, /* OPON normal */
92 0x50, /* OPON idle */
93 0x01, /* STBA */
94 0x3C, /* STBA */
95 0x1E, /* STBA */
96 0x08); /* GEN */
97
98 mipi_dbi_command(dbi, HX8357D_SETCYC,
99 0x02, /* NW 0x02 */
100 0x40, /* RTN */
101 0x00, /* DIV */
102 0x2A, /* DUM */
103 0x2A, /* DUM */
104 0x0D, /* GDON */
105 0x78); /* GDOFF */
106
107 mipi_dbi_command(dbi, HX8357D_SETGAMMA,
108 0x02,
109 0x0A,
110 0x11,
111 0x1d,
112 0x23,
113 0x35,
114 0x41,
115 0x4b,
116 0x4b,
117 0x42,
118 0x3A,
119 0x27,
120 0x1B,
121 0x08,
122 0x09,
123 0x03,
124 0x02,
125 0x0A,
126 0x11,
127 0x1d,
128 0x23,
129 0x35,
130 0x41,
131 0x4b,
132 0x4b,
133 0x42,
134 0x3A,
135 0x27,
136 0x1B,
137 0x08,
138 0x09,
139 0x03,
140 0x00,
141 0x01);
142
143 /* 16 bit */
144 mipi_dbi_command(dbi, MIPI_DCS_SET_PIXEL_FORMAT,
145 MIPI_DCS_PIXEL_FMT_16BIT);
146
147 /* TE off */
148 mipi_dbi_command(dbi, MIPI_DCS_SET_TEAR_ON, 0x00);
149
150 /* tear line */
151 mipi_dbi_command(dbi, MIPI_DCS_SET_TEAR_SCANLINE, 0x00, 0x02);
152
153 /* Exit Sleep */
154 mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE);
155 msleep(150);
156
157 /* display on */
158 mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON);
159 usleep_range(5000, 7000);
160
161out_enable:
162 switch (dbidev->rotation) {
163 default:
164 addr_mode = HX8357D_MADCTL_MX | HX8357D_MADCTL_MY;
165 break;
166 case 90:
167 addr_mode = HX8357D_MADCTL_MV | HX8357D_MADCTL_MY;
168 break;
169 case 180:
170 addr_mode = 0;
171 break;
172 case 270:
173 addr_mode = HX8357D_MADCTL_MV | HX8357D_MADCTL_MX;
174 break;
175 }
176 mipi_dbi_command(dbi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);
177 mipi_dbi_enable_flush(dbidev, crtc_state, plane_state);
178out_exit:
179 drm_dev_exit(idx);
180}
181
182static const struct drm_simple_display_pipe_funcs hx8357d_pipe_funcs = {
183 .enable = yx240qv29_enable,
184 .disable = mipi_dbi_pipe_disable,
185 .update = mipi_dbi_pipe_update,
186 .prepare_fb = drm_gem_fb_simple_display_pipe_prepare_fb,
187};
188
189static const struct drm_display_mode yx350hv15_mode = {
190 DRM_SIMPLE_MODE(320, 480, 60, 75),
191};
192
193DEFINE_DRM_GEM_CMA_FOPS(hx8357d_fops);
194
195static struct drm_driver hx8357d_driver = {
196 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
197 .fops = &hx8357d_fops,
198 .release = mipi_dbi_release,
199 DRM_GEM_CMA_VMAP_DRIVER_OPS,
200 .debugfs_init = mipi_dbi_debugfs_init,
201 .name = "hx8357d",
202 .desc = "HX8357D",
203 .date = "20181023",
204 .major = 1,
205 .minor = 0,
206};
207
208static const struct of_device_id hx8357d_of_match[] = {
209 { .compatible = "adafruit,yx350hv15" },
210 { }
211};
212MODULE_DEVICE_TABLE(of, hx8357d_of_match);
213
214static const struct spi_device_id hx8357d_id[] = {
215 { "yx350hv15", 0 },
216 { }
217};
218MODULE_DEVICE_TABLE(spi, hx8357d_id);
219
220static int hx8357d_probe(struct spi_device *spi)
221{
222 struct device *dev = &spi->dev;
223 struct mipi_dbi_dev *dbidev;
224 struct drm_device *drm;
225 struct gpio_desc *dc;
226 u32 rotation = 0;
227 int ret;
228
229 dbidev = kzalloc(sizeof(*dbidev), GFP_KERNEL);
230 if (!dbidev)
231 return -ENOMEM;
232
233 drm = &dbidev->drm;
234 ret = devm_drm_dev_init(dev, drm, &hx8357d_driver);
235 if (ret) {
236 kfree(dbidev);
237 return ret;
238 }
239
240 drm_mode_config_init(drm);
241
242 dc = devm_gpiod_get(dev, "dc", GPIOD_OUT_LOW);
243 if (IS_ERR(dc)) {
244 DRM_DEV_ERROR(dev, "Failed to get gpio 'dc'\n");
245 return PTR_ERR(dc);
246 }
247
248 dbidev->backlight = devm_of_find_backlight(dev);
249 if (IS_ERR(dbidev->backlight))
250 return PTR_ERR(dbidev->backlight);
251
252 device_property_read_u32(dev, "rotation", &rotation);
253
254 ret = mipi_dbi_spi_init(spi, &dbidev->dbi, dc);
255 if (ret)
256 return ret;
257
258 ret = mipi_dbi_dev_init(dbidev, &hx8357d_pipe_funcs, &yx350hv15_mode, rotation);
259 if (ret)
260 return ret;
261
262 drm_mode_config_reset(drm);
263
264 ret = drm_dev_register(drm, 0);
265 if (ret)
266 return ret;
267
268 spi_set_drvdata(spi, drm);
269
270 drm_fbdev_generic_setup(drm, 0);
271
272 return 0;
273}
274
275static int hx8357d_remove(struct spi_device *spi)
276{
277 struct drm_device *drm = spi_get_drvdata(spi);
278
279 drm_dev_unplug(drm);
280 drm_atomic_helper_shutdown(drm);
281
282 return 0;
283}
284
285static void hx8357d_shutdown(struct spi_device *spi)
286{
287 drm_atomic_helper_shutdown(spi_get_drvdata(spi));
288}
289
290static struct spi_driver hx8357d_spi_driver = {
291 .driver = {
292 .name = "hx8357d",
293 .of_match_table = hx8357d_of_match,
294 },
295 .id_table = hx8357d_id,
296 .probe = hx8357d_probe,
297 .remove = hx8357d_remove,
298 .shutdown = hx8357d_shutdown,
299};
300module_spi_driver(hx8357d_spi_driver);
301
302MODULE_DESCRIPTION("HX8357D DRM driver");
303MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
304MODULE_LICENSE("GPL");