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_fb_helper.h>
18 #include <drm/drm_gem_framebuffer_helper.h>
19 #include <drm/tinydrm/mipi-dbi.h>
20 #include <drm/tinydrm/tinydrm-helpers.h>
21
22 #define ST7735R_FRMCTR1 0xb1
23 #define ST7735R_FRMCTR2 0xb2
24 #define ST7735R_FRMCTR3 0xb3
25 #define ST7735R_INVCTR 0xb4
26 #define ST7735R_PWCTR1 0xc0
27 #define ST7735R_PWCTR2 0xc1
28 #define ST7735R_PWCTR3 0xc2
29 #define ST7735R_PWCTR4 0xc3
30 #define ST7735R_PWCTR5 0xc4
31 #define ST7735R_VMCTR1 0xc5
32 #define ST7735R_GAMCTRP1 0xe0
33 #define ST7735R_GAMCTRN1 0xe1
34
35 #define ST7735R_MY BIT(7)
36 #define ST7735R_MX BIT(6)
37 #define ST7735R_MV BIT(5)
38
jd_t18003_t01_pipe_enable(struct drm_simple_display_pipe * pipe,struct drm_crtc_state * crtc_state,struct drm_plane_state * plane_state)39 static void jd_t18003_t01_pipe_enable(struct drm_simple_display_pipe *pipe,
40 struct drm_crtc_state *crtc_state,
41 struct drm_plane_state *plane_state)
42 {
43 struct tinydrm_device *tdev = pipe_to_tinydrm(pipe);
44 struct mipi_dbi *mipi = mipi_dbi_from_tinydrm(tdev);
45 int ret;
46 u8 addr_mode;
47
48 DRM_DEBUG_KMS("\n");
49
50 ret = mipi_dbi_poweron_reset(mipi);
51 if (ret)
52 return;
53
54 msleep(150);
55
56 mipi_dbi_command(mipi, MIPI_DCS_EXIT_SLEEP_MODE);
57 msleep(500);
58
59 mipi_dbi_command(mipi, ST7735R_FRMCTR1, 0x01, 0x2c, 0x2d);
60 mipi_dbi_command(mipi, ST7735R_FRMCTR2, 0x01, 0x2c, 0x2d);
61 mipi_dbi_command(mipi, ST7735R_FRMCTR3, 0x01, 0x2c, 0x2d, 0x01, 0x2c,
62 0x2d);
63 mipi_dbi_command(mipi, ST7735R_INVCTR, 0x07);
64 mipi_dbi_command(mipi, ST7735R_PWCTR1, 0xa2, 0x02, 0x84);
65 mipi_dbi_command(mipi, ST7735R_PWCTR2, 0xc5);
66 mipi_dbi_command(mipi, ST7735R_PWCTR3, 0x0a, 0x00);
67 mipi_dbi_command(mipi, ST7735R_PWCTR4, 0x8a, 0x2a);
68 mipi_dbi_command(mipi, ST7735R_PWCTR5, 0x8a, 0xee);
69 mipi_dbi_command(mipi, ST7735R_VMCTR1, 0x0e);
70 mipi_dbi_command(mipi, MIPI_DCS_EXIT_INVERT_MODE);
71 switch (mipi->rotation) {
72 default:
73 addr_mode = ST7735R_MX | ST7735R_MY;
74 break;
75 case 90:
76 addr_mode = ST7735R_MX | ST7735R_MV;
77 break;
78 case 180:
79 addr_mode = 0;
80 break;
81 case 270:
82 addr_mode = ST7735R_MY | ST7735R_MV;
83 break;
84 }
85 mipi_dbi_command(mipi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);
86 mipi_dbi_command(mipi, MIPI_DCS_SET_PIXEL_FORMAT,
87 MIPI_DCS_PIXEL_FMT_16BIT);
88 mipi_dbi_command(mipi, ST7735R_GAMCTRP1, 0x02, 0x1c, 0x07, 0x12, 0x37,
89 0x32, 0x29, 0x2d, 0x29, 0x25, 0x2b, 0x39, 0x00, 0x01,
90 0x03, 0x10);
91 mipi_dbi_command(mipi, ST7735R_GAMCTRN1, 0x03, 0x1d, 0x07, 0x06, 0x2e,
92 0x2c, 0x29, 0x2d, 0x2e, 0x2e, 0x37, 0x3f, 0x00, 0x00,
93 0x02, 0x10);
94 mipi_dbi_command(mipi, MIPI_DCS_SET_DISPLAY_ON);
95
96 msleep(100);
97
98 mipi_dbi_command(mipi, MIPI_DCS_ENTER_NORMAL_MODE);
99
100 msleep(20);
101
102 mipi_dbi_enable_flush(mipi, crtc_state, plane_state);
103 }
104
105 static const struct drm_simple_display_pipe_funcs jd_t18003_t01_pipe_funcs = {
106 .enable = jd_t18003_t01_pipe_enable,
107 .disable = mipi_dbi_pipe_disable,
108 .update = tinydrm_display_pipe_update,
109 .prepare_fb = drm_gem_fb_simple_display_pipe_prepare_fb,
110 };
111
112 static const struct drm_display_mode jd_t18003_t01_mode = {
113 TINYDRM_MODE(128, 160, 28, 35),
114 };
115
116 DEFINE_DRM_GEM_CMA_FOPS(st7735r_fops);
117
118 static struct drm_driver st7735r_driver = {
119 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME |
120 DRIVER_ATOMIC,
121 .fops = &st7735r_fops,
122 TINYDRM_GEM_DRIVER_OPS,
123 .debugfs_init = mipi_dbi_debugfs_init,
124 .name = "st7735r",
125 .desc = "Sitronix ST7735R",
126 .date = "20171128",
127 .major = 1,
128 .minor = 0,
129 };
130
131 static const struct of_device_id st7735r_of_match[] = {
132 { .compatible = "jianda,jd-t18003-t01" },
133 { },
134 };
135 MODULE_DEVICE_TABLE(of, st7735r_of_match);
136
137 static const struct spi_device_id st7735r_id[] = {
138 { "jd-t18003-t01", 0 },
139 { },
140 };
141 MODULE_DEVICE_TABLE(spi, st7735r_id);
142
st7735r_probe(struct spi_device * spi)143 static int st7735r_probe(struct spi_device *spi)
144 {
145 struct device *dev = &spi->dev;
146 struct mipi_dbi *mipi;
147 struct gpio_desc *dc;
148 u32 rotation = 0;
149 int ret;
150
151 mipi = devm_kzalloc(dev, sizeof(*mipi), GFP_KERNEL);
152 if (!mipi)
153 return -ENOMEM;
154
155 mipi->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
156 if (IS_ERR(mipi->reset)) {
157 DRM_DEV_ERROR(dev, "Failed to get gpio 'reset'\n");
158 return PTR_ERR(mipi->reset);
159 }
160
161 dc = devm_gpiod_get(dev, "dc", GPIOD_OUT_LOW);
162 if (IS_ERR(dc)) {
163 DRM_DEV_ERROR(dev, "Failed to get gpio 'dc'\n");
164 return PTR_ERR(dc);
165 }
166
167 mipi->backlight = devm_of_find_backlight(dev);
168 if (IS_ERR(mipi->backlight))
169 return PTR_ERR(mipi->backlight);
170
171 device_property_read_u32(dev, "rotation", &rotation);
172
173 ret = mipi_dbi_spi_init(spi, mipi, dc);
174 if (ret)
175 return ret;
176
177 /* Cannot read from Adafruit 1.8" display via SPI */
178 mipi->read_commands = NULL;
179
180 ret = mipi_dbi_init(&spi->dev, mipi, &jd_t18003_t01_pipe_funcs,
181 &st7735r_driver, &jd_t18003_t01_mode, rotation);
182 if (ret)
183 return ret;
184
185 spi_set_drvdata(spi, mipi);
186
187 return devm_tinydrm_register(&mipi->tinydrm);
188 }
189
st7735r_shutdown(struct spi_device * spi)190 static void st7735r_shutdown(struct spi_device *spi)
191 {
192 struct mipi_dbi *mipi = spi_get_drvdata(spi);
193
194 tinydrm_shutdown(&mipi->tinydrm);
195 }
196
197 static struct spi_driver st7735r_spi_driver = {
198 .driver = {
199 .name = "st7735r",
200 .owner = THIS_MODULE,
201 .of_match_table = st7735r_of_match,
202 },
203 .id_table = st7735r_id,
204 .probe = st7735r_probe,
205 .shutdown = st7735r_shutdown,
206 };
207 module_spi_driver(st7735r_spi_driver);
208
209 MODULE_DESCRIPTION("Sitronix ST7735R DRM driver");
210 MODULE_AUTHOR("David Lechner <david@lechnology.com>");
211 MODULE_LICENSE("GPL");
212
