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
|
// SPDX-License-Identifier: GPL-2.0
/*
* Sharp LS037V7DW01 LCD Panel Driver
*
* Copyright (C) 2019 Texas Instruments Incorporated
*
* Based on the omapdrm-specific panel-sharp-ls037v7dw01 driver
*
* Copyright (C) 2013 Texas Instruments Incorporated
* Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
*/
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <drm/drm_connector.h>
#include <drm/drm_modes.h>
#include <drm/drm_panel.h>
struct ls037v7dw01_panel {
struct drm_panel panel;
struct platform_device *pdev;
struct regulator *vdd;
struct gpio_desc *resb_gpio; /* low = reset active min 20 us */
struct gpio_desc *ini_gpio; /* high = power on */
struct gpio_desc *mo_gpio; /* low = 480x640, high = 240x320 */
struct gpio_desc *lr_gpio; /* high = conventional horizontal scanning */
struct gpio_desc *ud_gpio; /* high = conventional vertical scanning */
};
#define to_ls037v7dw01_device(p) \
container_of(p, struct ls037v7dw01_panel, panel)
static int ls037v7dw01_disable(struct drm_panel *panel)
{
struct ls037v7dw01_panel *lcd = to_ls037v7dw01_device(panel);
gpiod_set_value_cansleep(lcd->ini_gpio, 0);
gpiod_set_value_cansleep(lcd->resb_gpio, 0);
/* Wait at least 5 vsyncs after disabling the LCD. */
msleep(100);
return 0;
}
static int ls037v7dw01_unprepare(struct drm_panel *panel)
{
struct ls037v7dw01_panel *lcd = to_ls037v7dw01_device(panel);
regulator_disable(lcd->vdd);
return 0;
}
static int ls037v7dw01_prepare(struct drm_panel *panel)
{
struct ls037v7dw01_panel *lcd = to_ls037v7dw01_device(panel);
int ret;
ret = regulator_enable(lcd->vdd);
if (ret < 0)
dev_err(&lcd->pdev->dev, "%s: failed to enable regulator\n",
__func__);
return ret;
}
static int ls037v7dw01_enable(struct drm_panel *panel)
{
struct ls037v7dw01_panel *lcd = to_ls037v7dw01_device(panel);
/* Wait couple of vsyncs before enabling the LCD. */
msleep(50);
gpiod_set_value_cansleep(lcd->resb_gpio, 1);
gpiod_set_value_cansleep(lcd->ini_gpio, 1);
return 0;
}
static const struct drm_display_mode ls037v7dw01_mode = {
.clock = 19200,
.hdisplay = 480,
.hsync_start = 480 + 1,
.hsync_end = 480 + 1 + 2,
.htotal = 480 + 1 + 2 + 28,
.vdisplay = 640,
.vsync_start = 640 + 1,
.vsync_end = 640 + 1 + 1,
.vtotal = 640 + 1 + 1 + 1,
.vrefresh = 58,
.type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
.flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
.width_mm = 56,
.height_mm = 75,
};
static int ls037v7dw01_get_modes(struct drm_panel *panel,
struct drm_connector *connector)
{
struct drm_display_mode *mode;
mode = drm_mode_duplicate(panel->drm, &ls037v7dw01_mode);
if (!mode)
return -ENOMEM;
drm_mode_set_name(mode);
drm_mode_probed_add(connector, mode);
connector->display_info.width_mm = ls037v7dw01_mode.width_mm;
connector->display_info.height_mm = ls037v7dw01_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 SDP3430
* 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 ls037v7dw01_funcs = {
.disable = ls037v7dw01_disable,
.unprepare = ls037v7dw01_unprepare,
.prepare = ls037v7dw01_prepare,
.enable = ls037v7dw01_enable,
.get_modes = ls037v7dw01_get_modes,
};
static int ls037v7dw01_probe(struct platform_device *pdev)
{
struct ls037v7dw01_panel *lcd;
lcd = devm_kzalloc(&pdev->dev, sizeof(*lcd), GFP_KERNEL);
if (!lcd)
return -ENOMEM;
platform_set_drvdata(pdev, lcd);
lcd->pdev = pdev;
lcd->vdd = devm_regulator_get(&pdev->dev, "envdd");
if (IS_ERR(lcd->vdd)) {
dev_err(&pdev->dev, "failed to get regulator\n");
return PTR_ERR(lcd->vdd);
}
lcd->ini_gpio = devm_gpiod_get(&pdev->dev, "enable", GPIOD_OUT_LOW);
if (IS_ERR(lcd->ini_gpio)) {
dev_err(&pdev->dev, "failed to get enable gpio\n");
return PTR_ERR(lcd->ini_gpio);
}
lcd->resb_gpio = devm_gpiod_get(&pdev->dev, "reset", GPIOD_OUT_LOW);
if (IS_ERR(lcd->resb_gpio)) {
dev_err(&pdev->dev, "failed to get reset gpio\n");
return PTR_ERR(lcd->resb_gpio);
}
lcd->mo_gpio = devm_gpiod_get_index(&pdev->dev, "mode", 0,
GPIOD_OUT_LOW);
if (IS_ERR(lcd->mo_gpio)) {
dev_err(&pdev->dev, "failed to get mode[0] gpio\n");
return PTR_ERR(lcd->mo_gpio);
}
lcd->lr_gpio = devm_gpiod_get_index(&pdev->dev, "mode", 1,
GPIOD_OUT_LOW);
if (IS_ERR(lcd->lr_gpio)) {
dev_err(&pdev->dev, "failed to get mode[1] gpio\n");
return PTR_ERR(lcd->lr_gpio);
}
lcd->ud_gpio = devm_gpiod_get_index(&pdev->dev, "mode", 2,
GPIOD_OUT_LOW);
if (IS_ERR(lcd->ud_gpio)) {
dev_err(&pdev->dev, "failed to get mode[2] gpio\n");
return PTR_ERR(lcd->ud_gpio);
}
drm_panel_init(&lcd->panel, &pdev->dev, &ls037v7dw01_funcs,
DRM_MODE_CONNECTOR_DPI);
return drm_panel_add(&lcd->panel);
}
static int ls037v7dw01_remove(struct platform_device *pdev)
{
struct ls037v7dw01_panel *lcd = platform_get_drvdata(pdev);
drm_panel_remove(&lcd->panel);
drm_panel_disable(&lcd->panel);
drm_panel_unprepare(&lcd->panel);
return 0;
}
static const struct of_device_id ls037v7dw01_of_match[] = {
{ .compatible = "sharp,ls037v7dw01", },
{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, ls037v7dw01_of_match);
static struct platform_driver ls037v7dw01_driver = {
.probe = ls037v7dw01_probe,
.remove = ls037v7dw01_remove,
.driver = {
.name = "panel-sharp-ls037v7dw01",
.of_match_table = ls037v7dw01_of_match,
},
};
module_platform_driver(ls037v7dw01_driver);
MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
MODULE_DESCRIPTION("Sharp LS037V7DW01 Panel Driver");
MODULE_LICENSE("GPL");
|
