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
|
// SPDX-License-Identifier: GPL-2.0
/*
* LG.Philips LB035Q02 LCD Panel Driver
*
* Copyright (C) 2019 Texas Instruments Incorporated
*
* Based on the omapdrm-specific panel-lgphilips-lb035q02 driver
*
* Copyright (C) 2013 Texas Instruments Incorporated
* Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
*
* Based on a driver by: Steve Sakoman <steve@sakoman.com>
*/
#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/spi/spi.h>
#include <drm/drm_connector.h>
#include <drm/drm_modes.h>
#include <drm/drm_panel.h>
struct lb035q02_device {
struct drm_panel panel;
struct spi_device *spi;
struct gpio_desc *enable_gpio;
};
#define to_lb035q02_device(p) container_of(p, struct lb035q02_device, panel)
static int lb035q02_write(struct lb035q02_device *lcd, u16 reg, u16 val)
{
struct spi_message msg;
struct spi_transfer index_xfer = {
.len = 3,
.cs_change = 1,
};
struct spi_transfer value_xfer = {
.len = 3,
};
u8 buffer[16];
spi_message_init(&msg);
/* register index */
buffer[0] = 0x70;
buffer[1] = 0x00;
buffer[2] = reg & 0x7f;
index_xfer.tx_buf = buffer;
spi_message_add_tail(&index_xfer, &msg);
/* register value */
buffer[4] = 0x72;
buffer[5] = val >> 8;
buffer[6] = val;
value_xfer.tx_buf = buffer + 4;
spi_message_add_tail(&value_xfer, &msg);
return spi_sync(lcd->spi, &msg);
}
static int lb035q02_init(struct lb035q02_device *lcd)
{
/* Init sequence from page 28 of the lb035q02 spec. */
static const struct {
u16 index;
u16 value;
} init_data[] = {
{ 0x01, 0x6300 },
{ 0x02, 0x0200 },
{ 0x03, 0x0177 },
{ 0x04, 0x04c7 },
{ 0x05, 0xffc0 },
{ 0x06, 0xe806 },
{ 0x0a, 0x4008 },
{ 0x0b, 0x0000 },
{ 0x0d, 0x0030 },
{ 0x0e, 0x2800 },
{ 0x0f, 0x0000 },
{ 0x16, 0x9f80 },
{ 0x17, 0x0a0f },
{ 0x1e, 0x00c1 },
{ 0x30, 0x0300 },
{ 0x31, 0x0007 },
{ 0x32, 0x0000 },
{ 0x33, 0x0000 },
{ 0x34, 0x0707 },
{ 0x35, 0x0004 },
{ 0x36, 0x0302 },
{ 0x37, 0x0202 },
{ 0x3a, 0x0a0d },
{ 0x3b, 0x0806 },
};
unsigned int i;
int ret;
for (i = 0; i < ARRAY_SIZE(init_data); ++i) {
ret = lb035q02_write(lcd, init_data[i].index,
init_data[i].value);
if (ret < 0)
return ret;
}
return 0;
}
static int lb035q02_disable(struct drm_panel *panel)
{
struct lb035q02_device *lcd = to_lb035q02_device(panel);
gpiod_set_value_cansleep(lcd->enable_gpio, 0);
return 0;
}
static int lb035q02_enable(struct drm_panel *panel)
{
struct lb035q02_device *lcd = to_lb035q02_device(panel);
gpiod_set_value_cansleep(lcd->enable_gpio, 1);
return 0;
}
static const struct drm_display_mode lb035q02_mode = {
.clock = 6500,
.hdisplay = 320,
.hsync_start = 320 + 20,
.hsync_end = 320 + 20 + 2,
.htotal = 320 + 20 + 2 + 68,
.vdisplay = 240,
.vsync_start = 240 + 4,
.vsync_end = 240 + 4 + 2,
.vtotal = 240 + 4 + 2 + 18,
.type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
.flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
.width_mm = 70,
.height_mm = 53,
};
static int lb035q02_get_modes(struct drm_panel *panel,
struct drm_connector *connector)
{
struct drm_display_mode *mode;
mode = drm_mode_duplicate(connector->dev, &lb035q02_mode);
if (!mode)
return -ENOMEM;
drm_mode_set_name(mode);
drm_mode_probed_add(connector, mode);
connector->display_info.width_mm = lb035q02_mode.width_mm;
connector->display_info.height_mm = lb035q02_mode.height_mm;
/*
* FIXME: According to the datasheet pixel data is sampled on the
* rising edge of the clock, but the code running on the Gumstix Overo
* Palo35 indicates sampling on the negative edge. This should be
* tested on a real device.
*/
connector->display_info.bus_flags = DRM_BUS_FLAG_DE_HIGH
| DRM_BUS_FLAG_SYNC_SAMPLE_POSEDGE
| DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE;
return 1;
}
static const struct drm_panel_funcs lb035q02_funcs = {
.disable = lb035q02_disable,
.enable = lb035q02_enable,
.get_modes = lb035q02_get_modes,
};
static int lb035q02_probe(struct spi_device *spi)
{
struct lb035q02_device *lcd;
int ret;
lcd = devm_kzalloc(&spi->dev, sizeof(*lcd), GFP_KERNEL);
if (!lcd)
return -ENOMEM;
spi_set_drvdata(spi, lcd);
lcd->spi = spi;
lcd->enable_gpio = devm_gpiod_get(&spi->dev, "enable", GPIOD_OUT_LOW);
if (IS_ERR(lcd->enable_gpio)) {
dev_err(&spi->dev, "failed to parse enable gpio\n");
return PTR_ERR(lcd->enable_gpio);
}
ret = lb035q02_init(lcd);
if (ret < 0)
return ret;
drm_panel_init(&lcd->panel, &lcd->spi->dev, &lb035q02_funcs,
DRM_MODE_CONNECTOR_DPI);
drm_panel_add(&lcd->panel);
return 0;
}
static void lb035q02_remove(struct spi_device *spi)
{
struct lb035q02_device *lcd = spi_get_drvdata(spi);
drm_panel_remove(&lcd->panel);
drm_panel_disable(&lcd->panel);
}
static const struct of_device_id lb035q02_of_match[] = {
{ .compatible = "lgphilips,lb035q02", },
{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, lb035q02_of_match);
static const struct spi_device_id lb035q02_ids[] = {
{ "lb035q02", 0 },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(spi, lb035q02_ids);
static struct spi_driver lb035q02_driver = {
.probe = lb035q02_probe,
.remove = lb035q02_remove,
.id_table = lb035q02_ids,
.driver = {
.name = "panel-lg-lb035q02",
.of_match_table = lb035q02_of_match,
},
};
module_spi_driver(lb035q02_driver);
MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
MODULE_DESCRIPTION("LG.Philips LB035Q02 LCD Panel driver");
MODULE_LICENSE("GPL");
|
