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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_atomic_helper.h>
18#include <drm/drm_drv.h>
19#include <drm/drm_fb_helper.h>
20#include <drm/drm_gem_cma_helper.h>
21#include <drm/drm_gem_framebuffer_helper.h>
22#include <drm/tinydrm/mipi-dbi.h>
23#include <drm/tinydrm/tinydrm-helpers.h>
24
25#define ST7735R_FRMCTR1 0xb1
26#define ST7735R_FRMCTR2 0xb2
27#define ST7735R_FRMCTR3 0xb3
28#define ST7735R_INVCTR 0xb4
29#define ST7735R_PWCTR1 0xc0
30#define ST7735R_PWCTR2 0xc1
31#define ST7735R_PWCTR3 0xc2
32#define ST7735R_PWCTR4 0xc3
33#define ST7735R_PWCTR5 0xc4
34#define ST7735R_VMCTR1 0xc5
35#define ST7735R_GAMCTRP1 0xe0
36#define ST7735R_GAMCTRN1 0xe1
37
38#define ST7735R_MY BIT(7)
39#define ST7735R_MX BIT(6)
40#define ST7735R_MV BIT(5)
41
42static void jd_t18003_t01_pipe_enable(struct drm_simple_display_pipe *pipe,
43 struct drm_crtc_state *crtc_state,
44 struct drm_plane_state *plane_state)
45{
46 struct mipi_dbi *mipi = drm_to_mipi_dbi(pipe->crtc.dev);
47 int ret, idx;
48 u8 addr_mode;
49
50 if (!drm_dev_enter(pipe->crtc.dev, &idx))
51 return;
52
53 DRM_DEBUG_KMS("\n");
54
55 ret = mipi_dbi_poweron_reset(mipi);
56 if (ret)
57 goto out_exit;
58
59 msleep(150);
60
61 mipi_dbi_command(mipi, MIPI_DCS_EXIT_SLEEP_MODE);
62 msleep(500);
63
64 mipi_dbi_command(mipi, ST7735R_FRMCTR1, 0x01, 0x2c, 0x2d);
65 mipi_dbi_command(mipi, ST7735R_FRMCTR2, 0x01, 0x2c, 0x2d);
66 mipi_dbi_command(mipi, ST7735R_FRMCTR3, 0x01, 0x2c, 0x2d, 0x01, 0x2c,
67 0x2d);
68 mipi_dbi_command(mipi, ST7735R_INVCTR, 0x07);
69 mipi_dbi_command(mipi, ST7735R_PWCTR1, 0xa2, 0x02, 0x84);
70 mipi_dbi_command(mipi, ST7735R_PWCTR2, 0xc5);
71 mipi_dbi_command(mipi, ST7735R_PWCTR3, 0x0a, 0x00);
72 mipi_dbi_command(mipi, ST7735R_PWCTR4, 0x8a, 0x2a);
73 mipi_dbi_command(mipi, ST7735R_PWCTR5, 0x8a, 0xee);
74 mipi_dbi_command(mipi, ST7735R_VMCTR1, 0x0e);
75 mipi_dbi_command(mipi, MIPI_DCS_EXIT_INVERT_MODE);
76 switch (mipi->rotation) {
77 default:
78 addr_mode = ST7735R_MX | ST7735R_MY;
79 break;
80 case 90:
81 addr_mode = ST7735R_MX | ST7735R_MV;
82 break;
83 case 180:
84 addr_mode = 0;
85 break;
86 case 270:
87 addr_mode = ST7735R_MY | ST7735R_MV;
88 break;
89 }
90 mipi_dbi_command(mipi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);
91 mipi_dbi_command(mipi, MIPI_DCS_SET_PIXEL_FORMAT,
92 MIPI_DCS_PIXEL_FMT_16BIT);
93 mipi_dbi_command(mipi, ST7735R_GAMCTRP1, 0x02, 0x1c, 0x07, 0x12, 0x37,
94 0x32, 0x29, 0x2d, 0x29, 0x25, 0x2b, 0x39, 0x00, 0x01,
95 0x03, 0x10);
96 mipi_dbi_command(mipi, ST7735R_GAMCTRN1, 0x03, 0x1d, 0x07, 0x06, 0x2e,
97 0x2c, 0x29, 0x2d, 0x2e, 0x2e, 0x37, 0x3f, 0x00, 0x00,
98 0x02, 0x10);
99 mipi_dbi_command(mipi, MIPI_DCS_SET_DISPLAY_ON);
100
101 msleep(100);
102
103 mipi_dbi_command(mipi, MIPI_DCS_ENTER_NORMAL_MODE);
104
105 msleep(20);
106
107 mipi_dbi_enable_flush(mipi, crtc_state, plane_state);
108out_exit:
109 drm_dev_exit(idx);
110}
111
112static const struct drm_simple_display_pipe_funcs jd_t18003_t01_pipe_funcs = {
113 .enable = jd_t18003_t01_pipe_enable,
114 .disable = mipi_dbi_pipe_disable,
115 .update = mipi_dbi_pipe_update,
116 .prepare_fb = drm_gem_fb_simple_display_pipe_prepare_fb,
117};
118
119static const struct drm_display_mode jd_t18003_t01_mode = {
120 DRM_SIMPLE_MODE(128, 160, 28, 35),
121};
122
123DEFINE_DRM_GEM_CMA_FOPS(st7735r_fops);
124
125static struct drm_driver st7735r_driver = {
126 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME |
127 DRIVER_ATOMIC,
128 .fops = &st7735r_fops,
129 .release = mipi_dbi_release,
130 DRM_GEM_CMA_VMAP_DRIVER_OPS,
131 .debugfs_init = mipi_dbi_debugfs_init,
132 .name = "st7735r",
133 .desc = "Sitronix ST7735R",
134 .date = "20171128",
135 .major = 1,
136 .minor = 0,
137};
138
139static const struct of_device_id st7735r_of_match[] = {
140 { .compatible = "jianda,jd-t18003-t01" },
141 { },
142};
143MODULE_DEVICE_TABLE(of, st7735r_of_match);
144
145static const struct spi_device_id st7735r_id[] = {
146 { "jd-t18003-t01", 0 },
147 { },
148};
149MODULE_DEVICE_TABLE(spi, st7735r_id);
150
151static int st7735r_probe(struct spi_device *spi)
152{
153 struct device *dev = &spi->dev;
154 struct drm_device *drm;
155 struct mipi_dbi *mipi;
156 struct gpio_desc *dc;
157 u32 rotation = 0;
158 int ret;
159
160 mipi = kzalloc(sizeof(*mipi), GFP_KERNEL);
161 if (!mipi)
162 return -ENOMEM;
163
164 drm = &mipi->drm;
165 ret = devm_drm_dev_init(dev, drm, &st7735r_driver);
166 if (ret) {
167 kfree(mipi);
168 return ret;
169 }
170
171 drm_mode_config_init(drm);
172
173 mipi->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
174 if (IS_ERR(mipi->reset)) {
175 DRM_DEV_ERROR(dev, "Failed to get gpio 'reset'\n");
176 return PTR_ERR(mipi->reset);
177 }
178
179 dc = devm_gpiod_get(dev, "dc", GPIOD_OUT_LOW);
180 if (IS_ERR(dc)) {
181 DRM_DEV_ERROR(dev, "Failed to get gpio 'dc'\n");
182 return PTR_ERR(dc);
183 }
184
185 mipi->backlight = devm_of_find_backlight(dev);
186 if (IS_ERR(mipi->backlight))
187 return PTR_ERR(mipi->backlight);
188
189 device_property_read_u32(dev, "rotation", &rotation);
190
191 ret = mipi_dbi_spi_init(spi, mipi, dc);
192 if (ret)
193 return ret;
194
195
196 mipi->read_commands = NULL;
197
198 ret = mipi_dbi_init(mipi, &jd_t18003_t01_pipe_funcs, &jd_t18003_t01_mode, rotation);
199 if (ret)
200 return ret;
201
202 drm_mode_config_reset(drm);
203
204 ret = drm_dev_register(drm, 0);
205 if (ret)
206 return ret;
207
208 spi_set_drvdata(spi, drm);
209
210 drm_fbdev_generic_setup(drm, 0);
211
212 return 0;
213}
214
215static int st7735r_remove(struct spi_device *spi)
216{
217 struct drm_device *drm = spi_get_drvdata(spi);
218
219 drm_dev_unplug(drm);
220 drm_atomic_helper_shutdown(drm);
221
222 return 0;
223}
224
225static void st7735r_shutdown(struct spi_device *spi)
226{
227 drm_atomic_helper_shutdown(spi_get_drvdata(spi));
228}
229
230static struct spi_driver st7735r_spi_driver = {
231 .driver = {
232 .name = "st7735r",
233 .owner = THIS_MODULE,
234 .of_match_table = st7735r_of_match,
235 },
236 .id_table = st7735r_id,
237 .probe = st7735r_probe,
238 .remove = st7735r_remove,
239 .shutdown = st7735r_shutdown,
240};
241module_spi_driver(st7735r_spi_driver);
242
243MODULE_DESCRIPTION("Sitronix ST7735R DRM driver");
244MODULE_AUTHOR("David Lechner <david@lechnology.com>");
245MODULE_LICENSE("GPL");
246
