This source file includes following definitions.
- to_panel_lvds
- panel_lvds_disable
- panel_lvds_unprepare
- panel_lvds_prepare
- panel_lvds_enable
- panel_lvds_get_modes
- panel_lvds_parse_dt
- panel_lvds_probe
- panel_lvds_remove
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11 #include <linux/backlight.h>
12 #include <linux/gpio/consumer.h>
13 #include <linux/module.h>
14 #include <linux/of_platform.h>
15 #include <linux/platform_device.h>
16 #include <linux/regulator/consumer.h>
17 #include <linux/slab.h>
18
19 #include <video/display_timing.h>
20 #include <video/of_display_timing.h>
21 #include <video/videomode.h>
22
23 #include <drm/drm_crtc.h>
24 #include <drm/drm_panel.h>
25
26 struct panel_lvds {
27 struct drm_panel panel;
28 struct device *dev;
29
30 const char *label;
31 unsigned int width;
32 unsigned int height;
33 struct videomode video_mode;
34 unsigned int bus_format;
35 bool data_mirror;
36
37 struct backlight_device *backlight;
38 struct regulator *supply;
39
40 struct gpio_desc *enable_gpio;
41 struct gpio_desc *reset_gpio;
42 };
43
44 static inline struct panel_lvds *to_panel_lvds(struct drm_panel *panel)
45 {
46 return container_of(panel, struct panel_lvds, panel);
47 }
48
49 static int panel_lvds_disable(struct drm_panel *panel)
50 {
51 struct panel_lvds *lvds = to_panel_lvds(panel);
52
53 if (lvds->backlight) {
54 lvds->backlight->props.power = FB_BLANK_POWERDOWN;
55 lvds->backlight->props.state |= BL_CORE_FBBLANK;
56 backlight_update_status(lvds->backlight);
57 }
58
59 return 0;
60 }
61
62 static int panel_lvds_unprepare(struct drm_panel *panel)
63 {
64 struct panel_lvds *lvds = to_panel_lvds(panel);
65
66 if (lvds->enable_gpio)
67 gpiod_set_value_cansleep(lvds->enable_gpio, 0);
68
69 if (lvds->supply)
70 regulator_disable(lvds->supply);
71
72 return 0;
73 }
74
75 static int panel_lvds_prepare(struct drm_panel *panel)
76 {
77 struct panel_lvds *lvds = to_panel_lvds(panel);
78
79 if (lvds->supply) {
80 int err;
81
82 err = regulator_enable(lvds->supply);
83 if (err < 0) {
84 dev_err(lvds->dev, "failed to enable supply: %d\n",
85 err);
86 return err;
87 }
88 }
89
90 if (lvds->enable_gpio)
91 gpiod_set_value_cansleep(lvds->enable_gpio, 1);
92
93 return 0;
94 }
95
96 static int panel_lvds_enable(struct drm_panel *panel)
97 {
98 struct panel_lvds *lvds = to_panel_lvds(panel);
99
100 if (lvds->backlight) {
101 lvds->backlight->props.state &= ~BL_CORE_FBBLANK;
102 lvds->backlight->props.power = FB_BLANK_UNBLANK;
103 backlight_update_status(lvds->backlight);
104 }
105
106 return 0;
107 }
108
109 static int panel_lvds_get_modes(struct drm_panel *panel)
110 {
111 struct panel_lvds *lvds = to_panel_lvds(panel);
112 struct drm_connector *connector = lvds->panel.connector;
113 struct drm_display_mode *mode;
114
115 mode = drm_mode_create(lvds->panel.drm);
116 if (!mode)
117 return 0;
118
119 drm_display_mode_from_videomode(&lvds->video_mode, mode);
120 mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
121 drm_mode_probed_add(connector, mode);
122
123 connector->display_info.width_mm = lvds->width;
124 connector->display_info.height_mm = lvds->height;
125 drm_display_info_set_bus_formats(&connector->display_info,
126 &lvds->bus_format, 1);
127 connector->display_info.bus_flags = lvds->data_mirror
128 ? DRM_BUS_FLAG_DATA_LSB_TO_MSB
129 : DRM_BUS_FLAG_DATA_MSB_TO_LSB;
130
131 return 1;
132 }
133
134 static const struct drm_panel_funcs panel_lvds_funcs = {
135 .disable = panel_lvds_disable,
136 .unprepare = panel_lvds_unprepare,
137 .prepare = panel_lvds_prepare,
138 .enable = panel_lvds_enable,
139 .get_modes = panel_lvds_get_modes,
140 };
141
142 static int panel_lvds_parse_dt(struct panel_lvds *lvds)
143 {
144 struct device_node *np = lvds->dev->of_node;
145 struct display_timing timing;
146 const char *mapping;
147 int ret;
148
149 ret = of_get_display_timing(np, "panel-timing", &timing);
150 if (ret < 0) {
151 dev_err(lvds->dev, "%pOF: problems parsing panel-timing (%d)\n",
152 np, ret);
153 return ret;
154 }
155
156 videomode_from_timing(&timing, &lvds->video_mode);
157
158 ret = of_property_read_u32(np, "width-mm", &lvds->width);
159 if (ret < 0) {
160 dev_err(lvds->dev, "%pOF: invalid or missing %s DT property\n",
161 np, "width-mm");
162 return -ENODEV;
163 }
164 ret = of_property_read_u32(np, "height-mm", &lvds->height);
165 if (ret < 0) {
166 dev_err(lvds->dev, "%pOF: invalid or missing %s DT property\n",
167 np, "height-mm");
168 return -ENODEV;
169 }
170
171 of_property_read_string(np, "label", &lvds->label);
172
173 ret = of_property_read_string(np, "data-mapping", &mapping);
174 if (ret < 0) {
175 dev_err(lvds->dev, "%pOF: invalid or missing %s DT property\n",
176 np, "data-mapping");
177 return -ENODEV;
178 }
179
180 if (!strcmp(mapping, "jeida-18")) {
181 lvds->bus_format = MEDIA_BUS_FMT_RGB666_1X7X3_SPWG;
182 } else if (!strcmp(mapping, "jeida-24")) {
183 lvds->bus_format = MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA;
184 } else if (!strcmp(mapping, "vesa-24")) {
185 lvds->bus_format = MEDIA_BUS_FMT_RGB888_1X7X4_SPWG;
186 } else {
187 dev_err(lvds->dev, "%pOF: invalid or missing %s DT property\n",
188 np, "data-mapping");
189 return -EINVAL;
190 }
191
192 lvds->data_mirror = of_property_read_bool(np, "data-mirror");
193
194 return 0;
195 }
196
197 static int panel_lvds_probe(struct platform_device *pdev)
198 {
199 struct panel_lvds *lvds;
200 int ret;
201
202 lvds = devm_kzalloc(&pdev->dev, sizeof(*lvds), GFP_KERNEL);
203 if (!lvds)
204 return -ENOMEM;
205
206 lvds->dev = &pdev->dev;
207
208 ret = panel_lvds_parse_dt(lvds);
209 if (ret < 0)
210 return ret;
211
212 lvds->supply = devm_regulator_get_optional(lvds->dev, "power");
213 if (IS_ERR(lvds->supply)) {
214 ret = PTR_ERR(lvds->supply);
215
216 if (ret != -ENODEV) {
217 if (ret != -EPROBE_DEFER)
218 dev_err(lvds->dev, "failed to request regulator: %d\n",
219 ret);
220 return ret;
221 }
222
223 lvds->supply = NULL;
224 }
225
226
227 lvds->enable_gpio = devm_gpiod_get_optional(lvds->dev, "enable",
228 GPIOD_OUT_LOW);
229 if (IS_ERR(lvds->enable_gpio)) {
230 ret = PTR_ERR(lvds->enable_gpio);
231 dev_err(lvds->dev, "failed to request %s GPIO: %d\n",
232 "enable", ret);
233 return ret;
234 }
235
236 lvds->reset_gpio = devm_gpiod_get_optional(lvds->dev, "reset",
237 GPIOD_OUT_HIGH);
238 if (IS_ERR(lvds->reset_gpio)) {
239 ret = PTR_ERR(lvds->reset_gpio);
240 dev_err(lvds->dev, "failed to request %s GPIO: %d\n",
241 "reset", ret);
242 return ret;
243 }
244
245 lvds->backlight = devm_of_find_backlight(lvds->dev);
246 if (IS_ERR(lvds->backlight))
247 return PTR_ERR(lvds->backlight);
248
249
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251
252
253
254
255
256
257 drm_panel_init(&lvds->panel);
258 lvds->panel.dev = lvds->dev;
259 lvds->panel.funcs = &panel_lvds_funcs;
260
261 ret = drm_panel_add(&lvds->panel);
262 if (ret < 0)
263 return ret;
264
265 dev_set_drvdata(lvds->dev, lvds);
266 return 0;
267 }
268
269 static int panel_lvds_remove(struct platform_device *pdev)
270 {
271 struct panel_lvds *lvds = dev_get_drvdata(&pdev->dev);
272
273 drm_panel_remove(&lvds->panel);
274
275 panel_lvds_disable(&lvds->panel);
276
277 return 0;
278 }
279
280 static const struct of_device_id panel_lvds_of_table[] = {
281 { .compatible = "panel-lvds", },
282 { },
283 };
284
285 MODULE_DEVICE_TABLE(of, panel_lvds_of_table);
286
287 static struct platform_driver panel_lvds_driver = {
288 .probe = panel_lvds_probe,
289 .remove = panel_lvds_remove,
290 .driver = {
291 .name = "panel-lvds",
292 .of_match_table = panel_lvds_of_table,
293 },
294 };
295
296 module_platform_driver(panel_lvds_driver);
297
298 MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
299 MODULE_DESCRIPTION("LVDS Panel Driver");
300 MODULE_LICENSE("GPL");