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
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
|
// SPDX-License-Identifier: GPL-2.0+
/*
* DRM driver for Ilitek ILI9486 panels
*
* Copyright 2020 Kamlesh Gurudasani <kamlesh.gurudasani@gmail.com>
*/
#include <linux/backlight.h>
#include <linux/delay.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_atomic_helper.h>
#include <drm/drm_gem_cma_helper.h>
#include <drm/drm_managed.h>
#include <drm/drm_mipi_dbi.h>
#include <drm/drm_modeset_helper.h>
#define ILI9486_ITFCTR1 0xb0
#define ILI9486_PWCTRL1 0xc2
#define ILI9486_VMCTRL1 0xc5
#define ILI9486_PGAMCTRL 0xe0
#define ILI9486_NGAMCTRL 0xe1
#define ILI9486_DGAMCTRL 0xe2
#define ILI9486_MADCTL_BGR BIT(3)
#define ILI9486_MADCTL_MV BIT(5)
#define ILI9486_MADCTL_MX BIT(6)
#define ILI9486_MADCTL_MY BIT(7)
/*
* The PiScreen/waveshare rpi-lcd-35 has a SPI to 16-bit parallel bus converter
* in front of the display controller. This means that 8-bit values have to be
* transferred as 16-bit.
*/
static int waveshare_command(struct mipi_dbi *mipi, u8 *cmd, u8 *par,
size_t num)
{
struct spi_device *spi = mipi->spi;
void *data = par;
u32 speed_hz;
int i, ret;
__be16 *buf;
buf = kmalloc(32 * sizeof(u16), GFP_KERNEL);
if (!buf)
return -ENOMEM;
/*
* The displays are Raspberry Pi HATs and connected to the 8-bit only
* SPI controller, so 16-bit command and parameters need byte swapping
* before being transferred as 8-bit on the big endian SPI bus.
* Pixel data bytes have already been swapped before this function is
* called.
*/
buf[0] = cpu_to_be16(*cmd);
gpiod_set_value_cansleep(mipi->dc, 0);
speed_hz = mipi_dbi_spi_cmd_max_speed(spi, 2);
ret = mipi_dbi_spi_transfer(spi, speed_hz, 8, buf, 2);
if (ret || !num)
goto free;
/* 8-bit configuration data, not 16-bit pixel data */
if (num <= 32) {
for (i = 0; i < num; i++)
buf[i] = cpu_to_be16(par[i]);
num *= 2;
speed_hz = mipi_dbi_spi_cmd_max_speed(spi, num);
data = buf;
}
gpiod_set_value_cansleep(mipi->dc, 1);
ret = mipi_dbi_spi_transfer(spi, speed_hz, 8, data, num);
free:
kfree(buf);
return ret;
}
static void waveshare_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;
u8 addr_mode;
int ret, idx;
if (!drm_dev_enter(pipe->crtc.dev, &idx))
return;
DRM_DEBUG_KMS("\n");
ret = mipi_dbi_poweron_conditional_reset(dbidev);
if (ret < 0)
goto out_exit;
if (ret == 1)
goto out_enable;
mipi_dbi_command(dbi, ILI9486_ITFCTR1);
mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE);
msleep(250);
mipi_dbi_command(dbi, MIPI_DCS_SET_PIXEL_FORMAT, 0x55);
mipi_dbi_command(dbi, ILI9486_PWCTRL1, 0x44);
mipi_dbi_command(dbi, ILI9486_VMCTRL1, 0x00, 0x00, 0x00, 0x00);
mipi_dbi_command(dbi, ILI9486_PGAMCTRL,
0x0F, 0x1F, 0x1C, 0x0C, 0x0F, 0x08, 0x48, 0x98,
0x37, 0x0A, 0x13, 0x04, 0x11, 0x0D, 0x0);
mipi_dbi_command(dbi, ILI9486_NGAMCTRL,
0x0F, 0x32, 0x2E, 0x0B, 0x0D, 0x05, 0x47, 0x75,
0x37, 0x06, 0x10, 0x03, 0x24, 0x20, 0x00);
mipi_dbi_command(dbi, ILI9486_DGAMCTRL,
0x0F, 0x32, 0x2E, 0x0B, 0x0D, 0x05, 0x47, 0x75,
0x37, 0x06, 0x10, 0x03, 0x24, 0x20, 0x00);
mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON);
msleep(100);
out_enable:
switch (dbidev->rotation) {
case 90:
addr_mode = ILI9486_MADCTL_MY;
break;
case 180:
addr_mode = ILI9486_MADCTL_MV;
break;
case 270:
addr_mode = ILI9486_MADCTL_MX;
break;
default:
addr_mode = ILI9486_MADCTL_MV | ILI9486_MADCTL_MY |
ILI9486_MADCTL_MX;
break;
}
addr_mode |= ILI9486_MADCTL_BGR;
mipi_dbi_command(dbi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);
mipi_dbi_enable_flush(dbidev, crtc_state, plane_state);
out_exit:
drm_dev_exit(idx);
}
static const struct drm_simple_display_pipe_funcs waveshare_pipe_funcs = {
.enable = waveshare_enable,
.disable = mipi_dbi_pipe_disable,
.update = mipi_dbi_pipe_update,
.prepare_fb = drm_gem_simple_display_pipe_prepare_fb,
};
static const struct drm_display_mode waveshare_mode = {
DRM_SIMPLE_MODE(480, 320, 73, 49),
};
DEFINE_DRM_GEM_CMA_FOPS(ili9486_fops);
static const struct drm_driver ili9486_driver = {
.driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
.fops = &ili9486_fops,
DRM_GEM_CMA_DRIVER_OPS_VMAP,
.debugfs_init = mipi_dbi_debugfs_init,
.name = "ili9486",
.desc = "Ilitek ILI9486",
.date = "20200118",
.major = 1,
.minor = 0,
};
static const struct of_device_id ili9486_of_match[] = {
{ .compatible = "waveshare,rpi-lcd-35" },
{ .compatible = "ozzmaker,piscreen" },
{},
};
MODULE_DEVICE_TABLE(of, ili9486_of_match);
static const struct spi_device_id ili9486_id[] = {
{ "ili9486", 0 },
{ }
};
MODULE_DEVICE_TABLE(spi, ili9486_id);
static int ili9486_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 = devm_drm_dev_alloc(dev, &ili9486_driver,
struct mipi_dbi_dev, drm);
if (IS_ERR(dbidev))
return PTR_ERR(dbidev);
dbi = &dbidev->dbi;
drm = &dbidev->drm;
dbi->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
if (IS_ERR(dbi->reset))
return dev_err_probe(dev, PTR_ERR(dbi->reset), "Failed to get GPIO 'reset'\n");
dc = devm_gpiod_get(dev, "dc", GPIOD_OUT_LOW);
if (IS_ERR(dc))
return dev_err_probe(dev, PTR_ERR(dc), "Failed to get GPIO 'dc'\n");
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;
dbi->command = waveshare_command;
dbi->read_commands = NULL;
ret = mipi_dbi_dev_init(dbidev, &waveshare_pipe_funcs,
&waveshare_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 ili9486_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 ili9486_shutdown(struct spi_device *spi)
{
drm_atomic_helper_shutdown(spi_get_drvdata(spi));
}
static struct spi_driver ili9486_spi_driver = {
.driver = {
.name = "ili9486",
.of_match_table = ili9486_of_match,
},
.id_table = ili9486_id,
.probe = ili9486_probe,
.remove = ili9486_remove,
.shutdown = ili9486_shutdown,
};
module_spi_driver(ili9486_spi_driver);
MODULE_DESCRIPTION("Ilitek ILI9486 DRM driver");
MODULE_AUTHOR("Kamlesh Gurudasani <kamlesh.gurudasani@gmail.com>");
MODULE_LICENSE("GPL");
|
