tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * DRM driver for Multi-Inno MI0283QT panels
3 *
4 * Copyright 2016 Noralf Trønnes
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 */
11
12#include <drm/tinydrm/ili9341.h>
13#include <drm/tinydrm/mipi-dbi.h>
14#include <drm/tinydrm/tinydrm-helpers.h>
15#include <linux/delay.h>
16#include <linux/gpio/consumer.h>
17#include <linux/module.h>
18#include <linux/property.h>
19#include <linux/regulator/consumer.h>
20#include <linux/spi/spi.h>
21#include <video/mipi_display.h>
22
23static int mi0283qt_init(struct mipi_dbi *mipi)
24{
25 struct tinydrm_device *tdev = &mipi->tinydrm;
26 struct device *dev = tdev->drm->dev;
27 u8 addr_mode;
28 int ret;
29
30 DRM_DEBUG_KMS("\n");
31
32 ret = regulator_enable(mipi->regulator);
33 if (ret) {
34 dev_err(dev, "Failed to enable regulator %d\n", ret);
35 return ret;
36 }
37
38 /* Avoid flicker by skipping setup if the bootloader has done it */
39 if (mipi_dbi_display_is_on(mipi))
40 return 0;
41
42 mipi_dbi_hw_reset(mipi);
43 ret = mipi_dbi_command(mipi, MIPI_DCS_SOFT_RESET);
44 if (ret) {
45 dev_err(dev, "Error sending command %d\n", ret);
46 regulator_disable(mipi->regulator);
47 return ret;
48 }
49
50 msleep(20);
51
52 mipi_dbi_command(mipi, MIPI_DCS_SET_DISPLAY_OFF);
53
54 mipi_dbi_command(mipi, ILI9341_PWCTRLB, 0x00, 0x83, 0x30);
55 mipi_dbi_command(mipi, ILI9341_PWRSEQ, 0x64, 0x03, 0x12, 0x81);
56 mipi_dbi_command(mipi, ILI9341_DTCTRLA, 0x85, 0x01, 0x79);
57 mipi_dbi_command(mipi, ILI9341_PWCTRLA, 0x39, 0x2c, 0x00, 0x34, 0x02);
58 mipi_dbi_command(mipi, ILI9341_PUMPCTRL, 0x20);
59 mipi_dbi_command(mipi, ILI9341_DTCTRLB, 0x00, 0x00);
60
61 /* Power Control */
62 mipi_dbi_command(mipi, ILI9341_PWCTRL1, 0x26);
63 mipi_dbi_command(mipi, ILI9341_PWCTRL2, 0x11);
64 /* VCOM */
65 mipi_dbi_command(mipi, ILI9341_VMCTRL1, 0x35, 0x3e);
66 mipi_dbi_command(mipi, ILI9341_VMCTRL2, 0xbe);
67
68 /* Memory Access Control */
69 mipi_dbi_command(mipi, MIPI_DCS_SET_PIXEL_FORMAT, 0x55);
70
71 switch (mipi->rotation) {
72 default:
73 addr_mode = ILI9341_MADCTL_MV | ILI9341_MADCTL_MY |
74 ILI9341_MADCTL_MX;
75 break;
76 case 90:
77 addr_mode = ILI9341_MADCTL_MY;
78 break;
79 case 180:
80 addr_mode = ILI9341_MADCTL_MV;
81 break;
82 case 270:
83 addr_mode = ILI9341_MADCTL_MX;
84 break;
85 }
86 addr_mode |= ILI9341_MADCTL_BGR;
87 mipi_dbi_command(mipi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);
88
89 /* Frame Rate */
90 mipi_dbi_command(mipi, ILI9341_FRMCTR1, 0x00, 0x1b);
91
92 /* Gamma */
93 mipi_dbi_command(mipi, ILI9341_EN3GAM, 0x08);
94 mipi_dbi_command(mipi, MIPI_DCS_SET_GAMMA_CURVE, 0x01);
95 mipi_dbi_command(mipi, ILI9341_PGAMCTRL,
96 0x1f, 0x1a, 0x18, 0x0a, 0x0f, 0x06, 0x45, 0x87,
97 0x32, 0x0a, 0x07, 0x02, 0x07, 0x05, 0x00);
98 mipi_dbi_command(mipi, ILI9341_NGAMCTRL,
99 0x00, 0x25, 0x27, 0x05, 0x10, 0x09, 0x3a, 0x78,
100 0x4d, 0x05, 0x18, 0x0d, 0x38, 0x3a, 0x1f);
101
102 /* DDRAM */
103 mipi_dbi_command(mipi, ILI9341_ETMOD, 0x07);
104
105 /* Display */
106 mipi_dbi_command(mipi, ILI9341_DISCTRL, 0x0a, 0x82, 0x27, 0x00);
107 mipi_dbi_command(mipi, MIPI_DCS_EXIT_SLEEP_MODE);
108 msleep(100);
109
110 mipi_dbi_command(mipi, MIPI_DCS_SET_DISPLAY_ON);
111 msleep(100);
112
113 return 0;
114}
115
116static void mi0283qt_fini(void *data)
117{
118 struct mipi_dbi *mipi = data;
119
120 DRM_DEBUG_KMS("\n");
121 regulator_disable(mipi->regulator);
122}
123
124static const struct drm_simple_display_pipe_funcs mi0283qt_pipe_funcs = {
125 .enable = mipi_dbi_pipe_enable,
126 .disable = mipi_dbi_pipe_disable,
127 .update = tinydrm_display_pipe_update,
128 .prepare_fb = tinydrm_display_pipe_prepare_fb,
129};
130
131static const struct drm_display_mode mi0283qt_mode = {
132 TINYDRM_MODE(320, 240, 58, 43),
133};
134
135DEFINE_DRM_GEM_CMA_FOPS(mi0283qt_fops);
136
137static struct drm_driver mi0283qt_driver = {
138 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME |
139 DRIVER_ATOMIC,
140 .fops = &mi0283qt_fops,
141 TINYDRM_GEM_DRIVER_OPS,
142 .lastclose = tinydrm_lastclose,
143 .debugfs_init = mipi_dbi_debugfs_init,
144 .name = "mi0283qt",
145 .desc = "Multi-Inno MI0283QT",
146 .date = "20160614",
147 .major = 1,
148 .minor = 0,
149};
150
151static const struct of_device_id mi0283qt_of_match[] = {
152 { .compatible = "multi-inno,mi0283qt" },
153 {},
154};
155MODULE_DEVICE_TABLE(of, mi0283qt_of_match);
156
157static const struct spi_device_id mi0283qt_id[] = {
158 { "mi0283qt", 0 },
159 { },
160};
161MODULE_DEVICE_TABLE(spi, mi0283qt_id);
162
163static int mi0283qt_probe(struct spi_device *spi)
164{
165 struct device *dev = &spi->dev;
166 struct tinydrm_device *tdev;
167 struct mipi_dbi *mipi;
168 struct gpio_desc *dc;
169 u32 rotation = 0;
170 int ret;
171
172 mipi = devm_kzalloc(dev, sizeof(*mipi), GFP_KERNEL);
173 if (!mipi)
174 return -ENOMEM;
175
176 mipi->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
177 if (IS_ERR(mipi->reset)) {
178 dev_err(dev, "Failed to get gpio 'reset'\n");
179 return PTR_ERR(mipi->reset);
180 }
181
182 dc = devm_gpiod_get_optional(dev, "dc", GPIOD_OUT_LOW);
183 if (IS_ERR(dc)) {
184 dev_err(dev, "Failed to get gpio 'dc'\n");
185 return PTR_ERR(dc);
186 }
187
188 mipi->regulator = devm_regulator_get(dev, "power");
189 if (IS_ERR(mipi->regulator))
190 return PTR_ERR(mipi->regulator);
191
192 mipi->backlight = tinydrm_of_find_backlight(dev);
193 if (IS_ERR(mipi->backlight))
194 return PTR_ERR(mipi->backlight);
195
196 device_property_read_u32(dev, "rotation", &rotation);
197
198 ret = mipi_dbi_spi_init(spi, mipi, dc, &mi0283qt_pipe_funcs,
199 &mi0283qt_driver, &mi0283qt_mode, rotation);
200 if (ret)
201 return ret;
202
203 ret = mi0283qt_init(mipi);
204 if (ret)
205 return ret;
206
207 /* use devres to fini after drm unregister (drv->remove is before) */
208 ret = devm_add_action(dev, mi0283qt_fini, mipi);
209 if (ret) {
210 mi0283qt_fini(mipi);
211 return ret;
212 }
213
214 tdev = &mipi->tinydrm;
215
216 ret = devm_tinydrm_register(tdev);
217 if (ret)
218 return ret;
219
220 spi_set_drvdata(spi, mipi);
221
222 DRM_DEBUG_DRIVER("Initialized %s:%s @%uMHz on minor %d\n",
223 tdev->drm->driver->name, dev_name(dev),
224 spi->max_speed_hz / 1000000,
225 tdev->drm->primary->index);
226
227 return 0;
228}
229
230static void mi0283qt_shutdown(struct spi_device *spi)
231{
232 struct mipi_dbi *mipi = spi_get_drvdata(spi);
233
234 tinydrm_shutdown(&mipi->tinydrm);
235}
236
237static int __maybe_unused mi0283qt_pm_suspend(struct device *dev)
238{
239 struct mipi_dbi *mipi = dev_get_drvdata(dev);
240 int ret;
241
242 ret = tinydrm_suspend(&mipi->tinydrm);
243 if (ret)
244 return ret;
245
246 mi0283qt_fini(mipi);
247
248 return 0;
249}
250
251static int __maybe_unused mi0283qt_pm_resume(struct device *dev)
252{
253 struct mipi_dbi *mipi = dev_get_drvdata(dev);
254 int ret;
255
256 ret = mi0283qt_init(mipi);
257 if (ret)
258 return ret;
259
260 return tinydrm_resume(&mipi->tinydrm);
261}
262
263static const struct dev_pm_ops mi0283qt_pm_ops = {
264 SET_SYSTEM_SLEEP_PM_OPS(mi0283qt_pm_suspend, mi0283qt_pm_resume)
265};
266
267static struct spi_driver mi0283qt_spi_driver = {
268 .driver = {
269 .name = "mi0283qt",
270 .owner = THIS_MODULE,
271 .of_match_table = mi0283qt_of_match,
272 .pm = &mi0283qt_pm_ops,
273 },
274 .id_table = mi0283qt_id,
275 .probe = mi0283qt_probe,
276 .shutdown = mi0283qt_shutdown,
277};
278module_spi_driver(mi0283qt_spi_driver);
279
280MODULE_DESCRIPTION("Multi-Inno MI0283QT DRM driver");
281MODULE_AUTHOR("Noralf Trønnes");
282MODULE_LICENSE("GPL");