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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 <drm/drmP.h>
20#include <drm/drm_crtc.h>
21#include <drm/drm_panel.h>
22
23#include <video/display_timing.h>
24#include <video/of_display_timing.h>
25#include <video/videomode.h>
26
27struct panel_lvds {
28 struct drm_panel panel;
29 struct device *dev;
30
31 const char *label;
32 unsigned int width;
33 unsigned int height;
34 struct videomode video_mode;
35 unsigned int bus_format;
36 bool data_mirror;
37
38 struct backlight_device *backlight;
39 struct regulator *supply;
40
41 struct gpio_desc *enable_gpio;
42 struct gpio_desc *reset_gpio;
43};
44
45static inline struct panel_lvds *to_panel_lvds(struct drm_panel *panel)
46{
47 return container_of(panel, struct panel_lvds, panel);
48}
49
50static int panel_lvds_disable(struct drm_panel *panel)
51{
52 struct panel_lvds *lvds = to_panel_lvds(panel);
53
54 if (lvds->backlight) {
55 lvds->backlight->props.power = FB_BLANK_POWERDOWN;
56 lvds->backlight->props.state |= BL_CORE_FBBLANK;
57 backlight_update_status(lvds->backlight);
58 }
59
60 return 0;
61}
62
63static int panel_lvds_unprepare(struct drm_panel *panel)
64{
65 struct panel_lvds *lvds = to_panel_lvds(panel);
66
67 if (lvds->enable_gpio)
68 gpiod_set_value_cansleep(lvds->enable_gpio, 0);
69
70 if (lvds->supply)
71 regulator_disable(lvds->supply);
72
73 return 0;
74}
75
76static int panel_lvds_prepare(struct drm_panel *panel)
77{
78 struct panel_lvds *lvds = to_panel_lvds(panel);
79
80 if (lvds->supply) {
81 int err;
82
83 err = regulator_enable(lvds->supply);
84 if (err < 0) {
85 dev_err(lvds->dev, "failed to enable supply: %d\n",
86 err);
87 return err;
88 }
89 }
90
91 if (lvds->enable_gpio)
92 gpiod_set_value_cansleep(lvds->enable_gpio, 1);
93
94 return 0;
95}
96
97static int panel_lvds_enable(struct drm_panel *panel)
98{
99 struct panel_lvds *lvds = to_panel_lvds(panel);
100
101 if (lvds->backlight) {
102 lvds->backlight->props.state &= ~BL_CORE_FBBLANK;
103 lvds->backlight->props.power = FB_BLANK_UNBLANK;
104 backlight_update_status(lvds->backlight);
105 }
106
107 return 0;
108}
109
110static int panel_lvds_get_modes(struct drm_panel *panel)
111{
112 struct panel_lvds *lvds = to_panel_lvds(panel);
113 struct drm_connector *connector = lvds->panel.connector;
114 struct drm_display_mode *mode;
115
116 mode = drm_mode_create(lvds->panel.drm);
117 if (!mode)
118 return 0;
119
120 drm_display_mode_from_videomode(&lvds->video_mode, mode);
121 mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
122 drm_mode_probed_add(connector, mode);
123
124 connector->display_info.width_mm = lvds->width;
125 connector->display_info.height_mm = lvds->height;
126 drm_display_info_set_bus_formats(&connector->display_info,
127 &lvds->bus_format, 1);
128 connector->display_info.bus_flags = lvds->data_mirror
129 ? DRM_BUS_FLAG_DATA_LSB_TO_MSB
130 : DRM_BUS_FLAG_DATA_MSB_TO_LSB;
131
132 return 1;
133}
134
135static const struct drm_panel_funcs panel_lvds_funcs = {
136 .disable = panel_lvds_disable,
137 .unprepare = panel_lvds_unprepare,
138 .prepare = panel_lvds_prepare,
139 .enable = panel_lvds_enable,
140 .get_modes = panel_lvds_get_modes,
141};
142
143static int panel_lvds_parse_dt(struct panel_lvds *lvds)
144{
145 struct device_node *np = lvds->dev->of_node;
146 struct display_timing timing;
147 const char *mapping;
148 int ret;
149
150 ret = of_get_display_timing(np, "panel-timing", &timing);
151 if (ret < 0)
152 return ret;
153
154 videomode_from_timing(&timing, &lvds->video_mode);
155
156 ret = of_property_read_u32(np, "width-mm", &lvds->width);
157 if (ret < 0) {
158 dev_err(lvds->dev, "%pOF: invalid or missing %s DT property\n",
159 np, "width-mm");
160 return -ENODEV;
161 }
162 ret = of_property_read_u32(np, "height-mm", &lvds->height);
163 if (ret < 0) {
164 dev_err(lvds->dev, "%pOF: invalid or missing %s DT property\n",
165 np, "height-mm");
166 return -ENODEV;
167 }
168
169 of_property_read_string(np, "label", &lvds->label);
170
171 ret = of_property_read_string(np, "data-mapping", &mapping);
172 if (ret < 0) {
173 dev_err(lvds->dev, "%pOF: invalid or missing %s DT property\n",
174 np, "data-mapping");
175 return -ENODEV;
176 }
177
178 if (!strcmp(mapping, "jeida-18")) {
179 lvds->bus_format = MEDIA_BUS_FMT_RGB666_1X7X3_SPWG;
180 } else if (!strcmp(mapping, "jeida-24")) {
181 lvds->bus_format = MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA;
182 } else if (!strcmp(mapping, "vesa-24")) {
183 lvds->bus_format = MEDIA_BUS_FMT_RGB888_1X7X4_SPWG;
184 } else {
185 dev_err(lvds->dev, "%pOF: invalid or missing %s DT property\n",
186 np, "data-mapping");
187 return -EINVAL;
188 }
189
190 lvds->data_mirror = of_property_read_bool(np, "data-mirror");
191
192 return 0;
193}
194
195static int panel_lvds_probe(struct platform_device *pdev)
196{
197 struct panel_lvds *lvds;
198 struct device_node *np;
199 int ret;
200
201 lvds = devm_kzalloc(&pdev->dev, sizeof(*lvds), GFP_KERNEL);
202 if (!lvds)
203 return -ENOMEM;
204
205 lvds->dev = &pdev->dev;
206
207 ret = panel_lvds_parse_dt(lvds);
208 if (ret < 0)
209 return ret;
210
211 lvds->supply = devm_regulator_get_optional(lvds->dev, "power");
212 if (IS_ERR(lvds->supply)) {
213 ret = PTR_ERR(lvds->supply);
214
215 if (ret != -ENODEV) {
216 if (ret != -EPROBE_DEFER)
217 dev_err(lvds->dev, "failed to request regulator: %d\n",
218 ret);
219 return ret;
220 }
221
222 lvds->supply = NULL;
223 }
224
225
226 lvds->enable_gpio = devm_gpiod_get_optional(lvds->dev, "enable",
227 GPIOD_OUT_LOW);
228 if (IS_ERR(lvds->enable_gpio)) {
229 ret = PTR_ERR(lvds->enable_gpio);
230 dev_err(lvds->dev, "failed to request %s GPIO: %d\n",
231 "enable", ret);
232 return ret;
233 }
234
235 lvds->reset_gpio = devm_gpiod_get_optional(lvds->dev, "reset",
236 GPIOD_OUT_HIGH);
237 if (IS_ERR(lvds->reset_gpio)) {
238 ret = PTR_ERR(lvds->reset_gpio);
239 dev_err(lvds->dev, "failed to request %s GPIO: %d\n",
240 "reset", ret);
241 return ret;
242 }
243
244 np = of_parse_phandle(lvds->dev->of_node, "backlight", 0);
245 if (np) {
246 lvds->backlight = of_find_backlight_by_node(np);
247 of_node_put(np);
248
249 if (!lvds->backlight)
250 return -EPROBE_DEFER;
251 }
252
253
254
255
256
257
258
259
260
261 drm_panel_init(&lvds->panel);
262 lvds->panel.dev = lvds->dev;
263 lvds->panel.funcs = &panel_lvds_funcs;
264
265 ret = drm_panel_add(&lvds->panel);
266 if (ret < 0)
267 goto error;
268
269 dev_set_drvdata(lvds->dev, lvds);
270 return 0;
271
272error:
273 put_device(&lvds->backlight->dev);
274 return ret;
275}
276
277static int panel_lvds_remove(struct platform_device *pdev)
278{
279 struct panel_lvds *lvds = dev_get_drvdata(&pdev->dev);
280
281 drm_panel_remove(&lvds->panel);
282
283 panel_lvds_disable(&lvds->panel);
284
285 if (lvds->backlight)
286 put_device(&lvds->backlight->dev);
287
288 return 0;
289}
290
291static const struct of_device_id panel_lvds_of_table[] = {
292 { .compatible = "panel-lvds", },
293 { },
294};
295
296MODULE_DEVICE_TABLE(of, panel_lvds_of_table);
297
298static struct platform_driver panel_lvds_driver = {
299 .probe = panel_lvds_probe,
300 .remove = panel_lvds_remove,
301 .driver = {
302 .name = "panel-lvds",
303 .of_match_table = panel_lvds_of_table,
304 },
305};
306
307module_platform_driver(panel_lvds_driver);
308
309MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
310MODULE_DESCRIPTION("LVDS Panel Driver");
311MODULE_LICENSE("GPL");
312
