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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/drm_mipi_dbi.h>
23
24#define ST7735R_FRMCTR1 0xb1
25#define ST7735R_FRMCTR2 0xb2
26#define ST7735R_FRMCTR3 0xb3
27#define ST7735R_INVCTR 0xb4
28#define ST7735R_PWCTR1 0xc0
29#define ST7735R_PWCTR2 0xc1
30#define ST7735R_PWCTR3 0xc2
31#define ST7735R_PWCTR4 0xc3
32#define ST7735R_PWCTR5 0xc4
33#define ST7735R_VMCTR1 0xc5
34#define ST7735R_GAMCTRP1 0xe0
35#define ST7735R_GAMCTRN1 0xe1
36
37#define ST7735R_MY BIT(7)
38#define ST7735R_MX BIT(6)
39#define ST7735R_MV BIT(5)
40
41static void jd_t18003_t01_pipe_enable(struct drm_simple_display_pipe *pipe,
42 struct drm_crtc_state *crtc_state,
43 struct drm_plane_state *plane_state)
44{
45 struct mipi_dbi_dev *dbidev = drm_to_mipi_dbi_dev(pipe->crtc.dev);
46 struct mipi_dbi *dbi = &dbidev->dbi;
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(dbidev);
56 if (ret)
57 goto out_exit;
58
59 msleep(150);
60
61 mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE);
62 msleep(500);
63
64 mipi_dbi_command(dbi, ST7735R_FRMCTR1, 0x01, 0x2c, 0x2d);
65 mipi_dbi_command(dbi, ST7735R_FRMCTR2, 0x01, 0x2c, 0x2d);
66 mipi_dbi_command(dbi, ST7735R_FRMCTR3, 0x01, 0x2c, 0x2d, 0x01, 0x2c,
67 0x2d);
68 mipi_dbi_command(dbi, ST7735R_INVCTR, 0x07);
69 mipi_dbi_command(dbi, ST7735R_PWCTR1, 0xa2, 0x02, 0x84);
70 mipi_dbi_command(dbi, ST7735R_PWCTR2, 0xc5);
71 mipi_dbi_command(dbi, ST7735R_PWCTR3, 0x0a, 0x00);
72 mipi_dbi_command(dbi, ST7735R_PWCTR4, 0x8a, 0x2a);
73 mipi_dbi_command(dbi, ST7735R_PWCTR5, 0x8a, 0xee);
74 mipi_dbi_command(dbi, ST7735R_VMCTR1, 0x0e);
75 mipi_dbi_command(dbi, MIPI_DCS_EXIT_INVERT_MODE);
76 switch (dbidev->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(dbi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);
91 mipi_dbi_command(dbi, MIPI_DCS_SET_PIXEL_FORMAT,
92 MIPI_DCS_PIXEL_FMT_16BIT);
93 mipi_dbi_command(dbi, ST7735R_GAMCTRP1, 0x02, 0x1c, 0x07, 0x12, 0x37,
94 0x32, 0x29, 0x2d, 0x29, 0x25, 0x2b, 0x39, 0x00, 0x01,
95 0x03, 0x10);
96 mipi_dbi_command(dbi, ST7735R_GAMCTRN1, 0x03, 0x1d, 0x07, 0x06, 0x2e,
97 0x2c, 0x29, 0x2d, 0x2e, 0x2e, 0x37, 0x3f, 0x00, 0x00,
98 0x02, 0x10);
99 mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON);
100
101 msleep(100);
102
103 mipi_dbi_command(dbi, MIPI_DCS_ENTER_NORMAL_MODE);
104
105 msleep(20);
106
107 mipi_dbi_enable_flush(dbidev, 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_ATOMIC,
127 .fops = &st7735r_fops,
128 .release = mipi_dbi_release,
129 DRM_GEM_CMA_VMAP_DRIVER_OPS,
130 .debugfs_init = mipi_dbi_debugfs_init,
131 .name = "st7735r",
132 .desc = "Sitronix ST7735R",
133 .date = "20171128",
134 .major = 1,
135 .minor = 0,
136};
137
138static const struct of_device_id st7735r_of_match[] = {
139 { .compatible = "jianda,jd-t18003-t01" },
140 { },
141};
142MODULE_DEVICE_TABLE(of, st7735r_of_match);
143
144static const struct spi_device_id st7735r_id[] = {
145 { "jd-t18003-t01", 0 },
146 { },
147};
148MODULE_DEVICE_TABLE(spi, st7735r_id);
149
150static int st7735r_probe(struct spi_device *spi)
151{
152 struct device *dev = &spi->dev;
153 struct mipi_dbi_dev *dbidev;
154 struct drm_device *drm;
155 struct mipi_dbi *dbi;
156 struct gpio_desc *dc;
157 u32 rotation = 0;
158 int ret;
159
160 dbidev = kzalloc(sizeof(*dbidev), GFP_KERNEL);
161 if (!dbidev)
162 return -ENOMEM;
163
164 dbi = &dbidev->dbi;
165 drm = &dbidev->drm;
166 ret = devm_drm_dev_init(dev, drm, &st7735r_driver);
167 if (ret) {
168 kfree(dbidev);
169 return ret;
170 }
171
172 drm_mode_config_init(drm);
173
174 dbi->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
175 if (IS_ERR(dbi->reset)) {
176 DRM_DEV_ERROR(dev, "Failed to get gpio 'reset'\n");
177 return PTR_ERR(dbi->reset);
178 }
179
180 dc = devm_gpiod_get(dev, "dc", GPIOD_OUT_LOW);
181 if (IS_ERR(dc)) {
182 DRM_DEV_ERROR(dev, "Failed to get gpio 'dc'\n");
183 return PTR_ERR(dc);
184 }
185
186 dbidev->backlight = devm_of_find_backlight(dev);
187 if (IS_ERR(dbidev->backlight))
188 return PTR_ERR(dbidev->backlight);
189
190 device_property_read_u32(dev, "rotation", &rotation);
191
192 ret = mipi_dbi_spi_init(spi, dbi, dc);
193 if (ret)
194 return ret;
195
196
197 dbi->read_commands = NULL;
198
199 ret = mipi_dbi_dev_init(dbidev, &jd_t18003_t01_pipe_funcs, &jd_t18003_t01_mode, rotation);
200 if (ret)
201 return ret;
202
203 drm_mode_config_reset(drm);
204
205 ret = drm_dev_register(drm, 0);
206 if (ret)
207 return ret;
208
209 spi_set_drvdata(spi, drm);
210
211 drm_fbdev_generic_setup(drm, 0);
212
213 return 0;
214}
215
216static int st7735r_remove(struct spi_device *spi)
217{
218 struct drm_device *drm = spi_get_drvdata(spi);
219
220 drm_dev_unplug(drm);
221 drm_atomic_helper_shutdown(drm);
222
223 return 0;
224}
225
226static void st7735r_shutdown(struct spi_device *spi)
227{
228 drm_atomic_helper_shutdown(spi_get_drvdata(spi));
229}
230
231static struct spi_driver st7735r_spi_driver = {
232 .driver = {
233 .name = "st7735r",
234 .owner = THIS_MODULE,
235 .of_match_table = st7735r_of_match,
236 },
237 .id_table = st7735r_id,
238 .probe = st7735r_probe,
239 .remove = st7735r_remove,
240 .shutdown = st7735r_shutdown,
241};
242module_spi_driver(st7735r_spi_driver);
243
244MODULE_DESCRIPTION("Sitronix ST7735R DRM driver");
245MODULE_AUTHOR("David Lechner <david@lechnology.com>");
246MODULE_LICENSE("GPL");
247
