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 Trønnes
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_fb_helper.h>
19 #include <drm/drm_gem_framebuffer_helper.h>
20 #include <drm/drm_modeset_helper.h>
21 #include <drm/tinydrm/mipi-dbi.h>
22 #include <drm/tinydrm/tinydrm-helpers.h>
23 #include <video/mipi_display.h>
24
25 #define ILI9341_FRMCTR1 0xb1
26 #define ILI9341_DISCTRL 0xb6
27 #define ILI9341_ETMOD 0xb7
28
29 #define ILI9341_PWCTRL1 0xc0
30 #define ILI9341_PWCTRL2 0xc1
31 #define ILI9341_VMCTRL1 0xc5
32 #define ILI9341_VMCTRL2 0xc7
33 #define ILI9341_PWCTRLA 0xcb
34 #define ILI9341_PWCTRLB 0xcf
35
36 #define ILI9341_PGAMCTRL 0xe0
37 #define ILI9341_NGAMCTRL 0xe1
38 #define ILI9341_DTCTRLA 0xe8
39 #define ILI9341_DTCTRLB 0xea
40 #define ILI9341_PWRSEQ 0xed
41
42 #define ILI9341_EN3GAM 0xf2
43 #define ILI9341_PUMPCTRL 0xf7
44
45 #define ILI9341_MADCTL_BGR BIT(3)
46 #define ILI9341_MADCTL_MV BIT(5)
47 #define ILI9341_MADCTL_MX BIT(6)
48 #define ILI9341_MADCTL_MY BIT(7)
49
yx240qv29_enable(struct drm_simple_display_pipe * pipe,struct drm_crtc_state * crtc_state,struct drm_plane_state * plane_state)50 static void yx240qv29_enable(struct drm_simple_display_pipe *pipe,
51 struct drm_crtc_state *crtc_state,
52 struct drm_plane_state *plane_state)
53 {
54 struct tinydrm_device *tdev = pipe_to_tinydrm(pipe);
55 struct mipi_dbi *mipi = mipi_dbi_from_tinydrm(tdev);
56 u8 addr_mode;
57 int ret;
58
59 DRM_DEBUG_KMS("\n");
60
61 ret = mipi_dbi_poweron_conditional_reset(mipi);
62 if (ret < 0)
63 return;
64 if (ret == 1)
65 goto out_enable;
66
67 mipi_dbi_command(mipi, MIPI_DCS_SET_DISPLAY_OFF);
68
69 mipi_dbi_command(mipi, ILI9341_PWCTRLB, 0x00, 0xc1, 0x30);
70 mipi_dbi_command(mipi, ILI9341_PWRSEQ, 0x64, 0x03, 0x12, 0x81);
71 mipi_dbi_command(mipi, ILI9341_DTCTRLA, 0x85, 0x00, 0x78);
72 mipi_dbi_command(mipi, ILI9341_PWCTRLA, 0x39, 0x2c, 0x00, 0x34, 0x02);
73 mipi_dbi_command(mipi, ILI9341_PUMPCTRL, 0x20);
74 mipi_dbi_command(mipi, ILI9341_DTCTRLB, 0x00, 0x00);
75
76 /* Power Control */
77 mipi_dbi_command(mipi, ILI9341_PWCTRL1, 0x23);
78 mipi_dbi_command(mipi, ILI9341_PWCTRL2, 0x10);
79 /* VCOM */
80 mipi_dbi_command(mipi, ILI9341_VMCTRL1, 0x3e, 0x28);
81 mipi_dbi_command(mipi, ILI9341_VMCTRL2, 0x86);
82
83 /* Memory Access Control */
84 mipi_dbi_command(mipi, MIPI_DCS_SET_PIXEL_FORMAT, MIPI_DCS_PIXEL_FMT_16BIT);
85
86 /* Frame Rate */
87 mipi_dbi_command(mipi, ILI9341_FRMCTR1, 0x00, 0x1b);
88
89 /* Gamma */
90 mipi_dbi_command(mipi, ILI9341_EN3GAM, 0x00);
91 mipi_dbi_command(mipi, MIPI_DCS_SET_GAMMA_CURVE, 0x01);
92 mipi_dbi_command(mipi, ILI9341_PGAMCTRL,
93 0x0f, 0x31, 0x2b, 0x0c, 0x0e, 0x08, 0x4e, 0xf1,
94 0x37, 0x07, 0x10, 0x03, 0x0e, 0x09, 0x00);
95 mipi_dbi_command(mipi, ILI9341_NGAMCTRL,
96 0x00, 0x0e, 0x14, 0x03, 0x11, 0x07, 0x31, 0xc1,
97 0x48, 0x08, 0x0f, 0x0c, 0x31, 0x36, 0x0f);
98
99 /* DDRAM */
100 mipi_dbi_command(mipi, ILI9341_ETMOD, 0x07);
101
102 /* Display */
103 mipi_dbi_command(mipi, ILI9341_DISCTRL, 0x08, 0x82, 0x27, 0x00);
104 mipi_dbi_command(mipi, MIPI_DCS_EXIT_SLEEP_MODE);
105 msleep(100);
106
107 mipi_dbi_command(mipi, MIPI_DCS_SET_DISPLAY_ON);
108 msleep(100);
109
110 out_enable:
111 switch (mipi->rotation) {
112 default:
113 addr_mode = ILI9341_MADCTL_MX;
114 break;
115 case 90:
116 addr_mode = ILI9341_MADCTL_MV;
117 break;
118 case 180:
119 addr_mode = ILI9341_MADCTL_MY;
120 break;
121 case 270:
122 addr_mode = ILI9341_MADCTL_MV | ILI9341_MADCTL_MY |
123 ILI9341_MADCTL_MX;
124 break;
125 }
126 addr_mode |= ILI9341_MADCTL_BGR;
127 mipi_dbi_command(mipi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);
128 mipi_dbi_enable_flush(mipi, crtc_state, plane_state);
129 }
130
131 static const struct drm_simple_display_pipe_funcs ili9341_pipe_funcs = {
132 .enable = yx240qv29_enable,
133 .disable = mipi_dbi_pipe_disable,
134 .update = tinydrm_display_pipe_update,
135 .prepare_fb = drm_gem_fb_simple_display_pipe_prepare_fb,
136 };
137
138 static const struct drm_display_mode yx240qv29_mode = {
139 TINYDRM_MODE(240, 320, 37, 49),
140 };
141
142 DEFINE_DRM_GEM_CMA_FOPS(ili9341_fops);
143
144 static struct drm_driver ili9341_driver = {
145 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME | DRIVER_ATOMIC,
146 .fops = &ili9341_fops,
147 TINYDRM_GEM_DRIVER_OPS,
148 .debugfs_init = mipi_dbi_debugfs_init,
149 .name = "ili9341",
150 .desc = "Ilitek ILI9341",
151 .date = "20180514",
152 .major = 1,
153 .minor = 0,
154 };
155
156 static const struct of_device_id ili9341_of_match[] = {
157 { .compatible = "adafruit,yx240qv29" },
158 { }
159 };
160 MODULE_DEVICE_TABLE(of, ili9341_of_match);
161
162 static const struct spi_device_id ili9341_id[] = {
163 { "yx240qv29", 0 },
164 { }
165 };
166 MODULE_DEVICE_TABLE(spi, ili9341_id);
167
ili9341_probe(struct spi_device * spi)168 static int ili9341_probe(struct spi_device *spi)
169 {
170 struct device *dev = &spi->dev;
171 struct mipi_dbi *mipi;
172 struct gpio_desc *dc;
173 u32 rotation = 0;
174 int ret;
175
176 mipi = devm_kzalloc(dev, sizeof(*mipi), GFP_KERNEL);
177 if (!mipi)
178 return -ENOMEM;
179
180 mipi->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
181 if (IS_ERR(mipi->reset)) {
182 DRM_DEV_ERROR(dev, "Failed to get gpio 'reset'\n");
183 return PTR_ERR(mipi->reset);
184 }
185
186 dc = devm_gpiod_get_optional(dev, "dc", GPIOD_OUT_LOW);
187 if (IS_ERR(dc)) {
188 DRM_DEV_ERROR(dev, "Failed to get gpio 'dc'\n");
189 return PTR_ERR(dc);
190 }
191
192 mipi->backlight = devm_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);
199 if (ret)
200 return ret;
201
202 ret = mipi_dbi_init(&spi->dev, mipi, &ili9341_pipe_funcs,
203 &ili9341_driver, &yx240qv29_mode, rotation);
204 if (ret)
205 return ret;
206
207 spi_set_drvdata(spi, mipi);
208
209 return devm_tinydrm_register(&mipi->tinydrm);
210 }
211
ili9341_shutdown(struct spi_device * spi)212 static void ili9341_shutdown(struct spi_device *spi)
213 {
214 struct mipi_dbi *mipi = spi_get_drvdata(spi);
215
216 tinydrm_shutdown(&mipi->tinydrm);
217 }
218
219 static struct spi_driver ili9341_spi_driver = {
220 .driver = {
221 .name = "ili9341",
222 .of_match_table = ili9341_of_match,
223 },
224 .id_table = ili9341_id,
225 .probe = ili9341_probe,
226 .shutdown = ili9341_shutdown,
227 };
228 module_spi_driver(ili9341_spi_driver);
229
230 MODULE_DESCRIPTION("Ilitek ILI9341 DRM driver");
231 MODULE_AUTHOR("David Lechner <david@lechnology.com>");
232 MODULE_LICENSE("GPL");
233
