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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/delay.h>
9#include <linux/dma-buf.h>
10#include <linux/gpio/consumer.h>
11#include <linux/module.h>
12#include <linux/property.h>
13#include <linux/spi/spi.h>
14#include <video/mipi_display.h>
15
16#include <drm/drm_fb_helper.h>
17#include <drm/drm_gem_framebuffer_helper.h>
18#include <drm/tinydrm/mipi-dbi.h>
19#include <drm/tinydrm/tinydrm-helpers.h>
20
21#define ST7735R_FRMCTR1 0xb1
22#define ST7735R_FRMCTR2 0xb2
23#define ST7735R_FRMCTR3 0xb3
24#define ST7735R_INVCTR 0xb4
25#define ST7735R_PWCTR1 0xc0
26#define ST7735R_PWCTR2 0xc1
27#define ST7735R_PWCTR3 0xc2
28#define ST7735R_PWCTR4 0xc3
29#define ST7735R_PWCTR5 0xc4
30#define ST7735R_VMCTR1 0xc5
31#define ST7735R_GAMCTRP1 0xe0
32#define ST7735R_GAMCTRN1 0xe1
33
34#define ST7735R_MY BIT(7)
35#define ST7735R_MX BIT(6)
36#define ST7735R_MV BIT(5)
37
38static void jd_t18003_t01_pipe_enable(struct drm_simple_display_pipe *pipe,
39 struct drm_crtc_state *crtc_state)
40{
41 struct tinydrm_device *tdev = pipe_to_tinydrm(pipe);
42 struct mipi_dbi *mipi = mipi_dbi_from_tinydrm(tdev);
43 struct device *dev = tdev->drm->dev;
44 int ret;
45 u8 addr_mode;
46
47 DRM_DEBUG_KMS("\n");
48
49 mipi_dbi_hw_reset(mipi);
50
51 ret = mipi_dbi_command(mipi, MIPI_DCS_SOFT_RESET);
52 if (ret) {
53 DRM_DEV_ERROR(dev, "Error sending command %d\n", ret);
54 return;
55 }
56
57 msleep(150);
58
59 mipi_dbi_command(mipi, MIPI_DCS_EXIT_SLEEP_MODE);
60 msleep(500);
61
62 mipi_dbi_command(mipi, ST7735R_FRMCTR1, 0x01, 0x2c, 0x2d);
63 mipi_dbi_command(mipi, ST7735R_FRMCTR2, 0x01, 0x2c, 0x2d);
64 mipi_dbi_command(mipi, ST7735R_FRMCTR3, 0x01, 0x2c, 0x2d, 0x01, 0x2c,
65 0x2d);
66 mipi_dbi_command(mipi, ST7735R_INVCTR, 0x07);
67 mipi_dbi_command(mipi, ST7735R_PWCTR1, 0xa2, 0x02, 0x84);
68 mipi_dbi_command(mipi, ST7735R_PWCTR2, 0xc5);
69 mipi_dbi_command(mipi, ST7735R_PWCTR3, 0x0a, 0x00);
70 mipi_dbi_command(mipi, ST7735R_PWCTR4, 0x8a, 0x2a);
71 mipi_dbi_command(mipi, ST7735R_PWCTR5, 0x8a, 0xee);
72 mipi_dbi_command(mipi, ST7735R_VMCTR1, 0x0e);
73 mipi_dbi_command(mipi, MIPI_DCS_EXIT_INVERT_MODE);
74 switch (mipi->rotation) {
75 default:
76 addr_mode = ST7735R_MX | ST7735R_MY;
77 break;
78 case 90:
79 addr_mode = ST7735R_MX | ST7735R_MV;
80 break;
81 case 180:
82 addr_mode = 0;
83 break;
84 case 270:
85 addr_mode = ST7735R_MY | ST7735R_MV;
86 break;
87 }
88 mipi_dbi_command(mipi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);
89 mipi_dbi_command(mipi, MIPI_DCS_SET_PIXEL_FORMAT,
90 MIPI_DCS_PIXEL_FMT_16BIT);
91 mipi_dbi_command(mipi, ST7735R_GAMCTRP1, 0x02, 0x1c, 0x07, 0x12, 0x37,
92 0x32, 0x29, 0x2d, 0x29, 0x25, 0x2b, 0x39, 0x00, 0x01,
93 0x03, 0x10);
94 mipi_dbi_command(mipi, ST7735R_GAMCTRN1, 0x03, 0x1d, 0x07, 0x06, 0x2e,
95 0x2c, 0x29, 0x2d, 0x2e, 0x2e, 0x37, 0x3f, 0x00, 0x00,
96 0x02, 0x10);
97 mipi_dbi_command(mipi, MIPI_DCS_SET_DISPLAY_ON);
98
99 msleep(100);
100
101 mipi_dbi_command(mipi, MIPI_DCS_ENTER_NORMAL_MODE);
102
103 msleep(20);
104
105 mipi_dbi_pipe_enable(pipe, crtc_state);
106}
107
108static const struct drm_simple_display_pipe_funcs jd_t18003_t01_pipe_funcs = {
109 .enable = jd_t18003_t01_pipe_enable,
110 .disable = mipi_dbi_pipe_disable,
111 .update = tinydrm_display_pipe_update,
112 .prepare_fb = tinydrm_display_pipe_prepare_fb,
113};
114
115static const struct drm_display_mode jd_t18003_t01_mode = {
116 TINYDRM_MODE(128, 160, 28, 35),
117};
118
119DEFINE_DRM_GEM_CMA_FOPS(st7735r_fops);
120
121static struct drm_driver st7735r_driver = {
122 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME |
123 DRIVER_ATOMIC,
124 .fops = &st7735r_fops,
125 TINYDRM_GEM_DRIVER_OPS,
126 .lastclose = drm_fb_helper_lastclose,
127 .debugfs_init = mipi_dbi_debugfs_init,
128 .name = "st7735r",
129 .desc = "Sitronix ST7735R",
130 .date = "20171128",
131 .major = 1,
132 .minor = 0,
133};
134
135static const struct of_device_id st7735r_of_match[] = {
136 { .compatible = "jianda,jd-t18003-t01" },
137 { },
138};
139MODULE_DEVICE_TABLE(of, st7735r_of_match);
140
141static const struct spi_device_id st7735r_id[] = {
142 { "jd-t18003-t01", 0 },
143 { },
144};
145MODULE_DEVICE_TABLE(spi, st7735r_id);
146
147static int st7735r_probe(struct spi_device *spi)
148{
149 struct device *dev = &spi->dev;
150 struct mipi_dbi *mipi;
151 struct gpio_desc *dc;
152 u32 rotation = 0;
153 int ret;
154
155 mipi = devm_kzalloc(dev, sizeof(*mipi), GFP_KERNEL);
156 if (!mipi)
157 return -ENOMEM;
158
159 mipi->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
160 if (IS_ERR(mipi->reset)) {
161 DRM_DEV_ERROR(dev, "Failed to get gpio 'reset'\n");
162 return PTR_ERR(mipi->reset);
163 }
164
165 dc = devm_gpiod_get(dev, "dc", GPIOD_OUT_LOW);
166 if (IS_ERR(dc)) {
167 DRM_DEV_ERROR(dev, "Failed to get gpio 'dc'\n");
168 return PTR_ERR(dc);
169 }
170
171 mipi->backlight = tinydrm_of_find_backlight(dev);
172 if (IS_ERR(mipi->backlight))
173 return PTR_ERR(mipi->backlight);
174
175 device_property_read_u32(dev, "rotation", &rotation);
176
177 ret = mipi_dbi_spi_init(spi, mipi, dc);
178 if (ret)
179 return ret;
180
181 /* Cannot read from Adafruit 1.8" display via SPI */
182 mipi->read_commands = NULL;
183
184 ret = mipi_dbi_init(&spi->dev, mipi, &jd_t18003_t01_pipe_funcs,
185 &st7735r_driver, &jd_t18003_t01_mode, rotation);
186 if (ret)
187 return ret;
188
189 spi_set_drvdata(spi, mipi);
190
191 return devm_tinydrm_register(&mipi->tinydrm);
192}
193
194static void st7735r_shutdown(struct spi_device *spi)
195{
196 struct mipi_dbi *mipi = spi_get_drvdata(spi);
197
198 tinydrm_shutdown(&mipi->tinydrm);
199}
200
201static struct spi_driver st7735r_spi_driver = {
202 .driver = {
203 .name = "st7735r",
204 .owner = THIS_MODULE,
205 .of_match_table = st7735r_of_match,
206 },
207 .id_table = st7735r_id,
208 .probe = st7735r_probe,
209 .shutdown = st7735r_shutdown,
210};
211module_spi_driver(st7735r_spi_driver);
212
213MODULE_DESCRIPTION("Sitronix ST7735R DRM driver");
214MODULE_AUTHOR("David Lechner <david@lechnology.com>");
215MODULE_LICENSE("GPL");