summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/tiny/st7735r.c
blob: 3f4487c716848cf820bb67ce3631c3d027ceb384 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
// SPDX-License-Identifier: GPL-2.0+
/*
 * DRM driver for Sitronix ST7735R panels
 *
 * Copyright 2017 David Lechner <david@lechnology.com>
 */

#include <linux/backlight.h>
#include <linux/delay.h>
#include <linux/dma-buf.h>
#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/property.h>
#include <linux/spi/spi.h>
#include <video/mipi_display.h>

#include <drm/drm_atomic_helper.h>
#include <drm/drm_drv.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_gem_cma_helper.h>
#include <drm/drm_gem_framebuffer_helper.h>
#include <drm/drm_mipi_dbi.h>

#define ST7735R_FRMCTR1		0xb1
#define ST7735R_FRMCTR2		0xb2
#define ST7735R_FRMCTR3		0xb3
#define ST7735R_INVCTR		0xb4
#define ST7735R_PWCTR1		0xc0
#define ST7735R_PWCTR2		0xc1
#define ST7735R_PWCTR3		0xc2
#define ST7735R_PWCTR4		0xc3
#define ST7735R_PWCTR5		0xc4
#define ST7735R_VMCTR1		0xc5
#define ST7735R_GAMCTRP1	0xe0
#define ST7735R_GAMCTRN1	0xe1

#define ST7735R_MY	BIT(7)
#define ST7735R_MX	BIT(6)
#define ST7735R_MV	BIT(5)

static void jd_t18003_t01_pipe_enable(struct drm_simple_display_pipe *pipe,
				      struct drm_crtc_state *crtc_state,
				      struct drm_plane_state *plane_state)
{
	struct mipi_dbi_dev *dbidev = drm_to_mipi_dbi_dev(pipe->crtc.dev);
	struct mipi_dbi *dbi = &dbidev->dbi;
	int ret, idx;
	u8 addr_mode;

	if (!drm_dev_enter(pipe->crtc.dev, &idx))
		return;

	DRM_DEBUG_KMS("\n");

	ret = mipi_dbi_poweron_reset(dbidev);
	if (ret)
		goto out_exit;

	msleep(150);

	mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE);
	msleep(500);

	mipi_dbi_command(dbi, ST7735R_FRMCTR1, 0x01, 0x2c, 0x2d);
	mipi_dbi_command(dbi, ST7735R_FRMCTR2, 0x01, 0x2c, 0x2d);
	mipi_dbi_command(dbi, ST7735R_FRMCTR3, 0x01, 0x2c, 0x2d, 0x01, 0x2c,
			 0x2d);
	mipi_dbi_command(dbi, ST7735R_INVCTR, 0x07);
	mipi_dbi_command(dbi, ST7735R_PWCTR1, 0xa2, 0x02, 0x84);
	mipi_dbi_command(dbi, ST7735R_PWCTR2, 0xc5);
	mipi_dbi_command(dbi, ST7735R_PWCTR3, 0x0a, 0x00);
	mipi_dbi_command(dbi, ST7735R_PWCTR4, 0x8a, 0x2a);
	mipi_dbi_command(dbi, ST7735R_PWCTR5, 0x8a, 0xee);
	mipi_dbi_command(dbi, ST7735R_VMCTR1, 0x0e);
	mipi_dbi_command(dbi, MIPI_DCS_EXIT_INVERT_MODE);
	switch (dbidev->rotation) {
	default:
		addr_mode = ST7735R_MX | ST7735R_MY;
		break;
	case 90:
		addr_mode = ST7735R_MX | ST7735R_MV;
		break;
	case 180:
		addr_mode = 0;
		break;
	case 270:
		addr_mode = ST7735R_MY | ST7735R_MV;
		break;
	}
	mipi_dbi_command(dbi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);
	mipi_dbi_command(dbi, MIPI_DCS_SET_PIXEL_FORMAT,
			 MIPI_DCS_PIXEL_FMT_16BIT);
	mipi_dbi_command(dbi, ST7735R_GAMCTRP1, 0x02, 0x1c, 0x07, 0x12, 0x37,
			 0x32, 0x29, 0x2d, 0x29, 0x25, 0x2b, 0x39, 0x00, 0x01,
			 0x03, 0x10);
	mipi_dbi_command(dbi, ST7735R_GAMCTRN1, 0x03, 0x1d, 0x07, 0x06, 0x2e,
			 0x2c, 0x29, 0x2d, 0x2e, 0x2e, 0x37, 0x3f, 0x00, 0x00,
			 0x02, 0x10);
	mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON);

	msleep(100);

	mipi_dbi_command(dbi, MIPI_DCS_ENTER_NORMAL_MODE);

	msleep(20);

	mipi_dbi_enable_flush(dbidev, crtc_state, plane_state);
out_exit:
	drm_dev_exit(idx);
}

static const struct drm_simple_display_pipe_funcs jd_t18003_t01_pipe_funcs = {
	.enable		= jd_t18003_t01_pipe_enable,
	.disable	= mipi_dbi_pipe_disable,
	.update		= mipi_dbi_pipe_update,
	.prepare_fb	= drm_gem_fb_simple_display_pipe_prepare_fb,
};

static const struct drm_display_mode jd_t18003_t01_mode = {
	DRM_SIMPLE_MODE(128, 160, 28, 35),
};

DEFINE_DRM_GEM_CMA_FOPS(st7735r_fops);

static struct drm_driver st7735r_driver = {
	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
	.fops			= &st7735r_fops,
	.release		= mipi_dbi_release,
	DRM_GEM_CMA_VMAP_DRIVER_OPS,
	.debugfs_init		= mipi_dbi_debugfs_init,
	.name			= "st7735r",
	.desc			= "Sitronix ST7735R",
	.date			= "20171128",
	.major			= 1,
	.minor			= 0,
};

static const struct of_device_id st7735r_of_match[] = {
	{ .compatible = "jianda,jd-t18003-t01" },
	{ },
};
MODULE_DEVICE_TABLE(of, st7735r_of_match);

static const struct spi_device_id st7735r_id[] = {
	{ "jd-t18003-t01", 0 },
	{ },
};
MODULE_DEVICE_TABLE(spi, st7735r_id);

static int st7735r_probe(struct spi_device *spi)
{
	struct device *dev = &spi->dev;
	struct mipi_dbi_dev *dbidev;
	struct drm_device *drm;
	struct mipi_dbi *dbi;
	struct gpio_desc *dc;
	u32 rotation = 0;
	int ret;

	dbidev = kzalloc(sizeof(*dbidev), GFP_KERNEL);
	if (!dbidev)
		return -ENOMEM;

	dbi = &dbidev->dbi;
	drm = &dbidev->drm;
	ret = devm_drm_dev_init(dev, drm, &st7735r_driver);
	if (ret) {
		kfree(dbidev);
		return ret;
	}

	drm_mode_config_init(drm);

	dbi->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
	if (IS_ERR(dbi->reset)) {
		DRM_DEV_ERROR(dev, "Failed to get gpio 'reset'\n");
		return PTR_ERR(dbi->reset);
	}

	dc = devm_gpiod_get(dev, "dc", GPIOD_OUT_LOW);
	if (IS_ERR(dc)) {
		DRM_DEV_ERROR(dev, "Failed to get gpio 'dc'\n");
		return PTR_ERR(dc);
	}

	dbidev->backlight = devm_of_find_backlight(dev);
	if (IS_ERR(dbidev->backlight))
		return PTR_ERR(dbidev->backlight);

	device_property_read_u32(dev, "rotation", &rotation);

	ret = mipi_dbi_spi_init(spi, dbi, dc);
	if (ret)
		return ret;

	/* Cannot read from Adafruit 1.8" display via SPI */
	dbi->read_commands = NULL;

	ret = mipi_dbi_dev_init(dbidev, &jd_t18003_t01_pipe_funcs, &jd_t18003_t01_mode, rotation);
	if (ret)
		return ret;

	drm_mode_config_reset(drm);

	ret = drm_dev_register(drm, 0);
	if (ret)
		return ret;

	spi_set_drvdata(spi, drm);

	drm_fbdev_generic_setup(drm, 0);

	return 0;
}

static int st7735r_remove(struct spi_device *spi)
{
	struct drm_device *drm = spi_get_drvdata(spi);

	drm_dev_unplug(drm);
	drm_atomic_helper_shutdown(drm);

	return 0;
}

static void st7735r_shutdown(struct spi_device *spi)
{
	drm_atomic_helper_shutdown(spi_get_drvdata(spi));
}

static struct spi_driver st7735r_spi_driver = {
	.driver = {
		.name = "st7735r",
		.owner = THIS_MODULE,
		.of_match_table = st7735r_of_match,
	},
	.id_table = st7735r_id,
	.probe = st7735r_probe,
	.remove = st7735r_remove,
	.shutdown = st7735r_shutdown,
};
module_spi_driver(st7735r_spi_driver);

MODULE_DESCRIPTION("Sitronix ST7735R DRM driver");
MODULE_AUTHOR("David Lechner <david@lechnology.com>");
MODULE_LICENSE("GPL");