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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Generic LVDS panel driver
4 *
5 * Copyright (C) 2016 Laurent Pinchart
6 * Copyright (C) 2016 Renesas Electronics Corporation
7 *
8 * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
9 */
10
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
26struct 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
44static inline struct panel_lvds *to_panel_lvds(struct drm_panel *panel)
45{
46 return container_of(panel, struct panel_lvds, panel);
47}
48
49static 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
62static 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
75static 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
96static 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
109static 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
134static 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
142static 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
197static int panel_lvds_probe(struct platform_device *pdev)
198{
199 struct panel_lvds *lvds;
200 struct device_node *np;
201 int ret;
202
203 lvds = devm_kzalloc(&pdev->dev, sizeof(*lvds), GFP_KERNEL);
204 if (!lvds)
205 return -ENOMEM;
206
207 lvds->dev = &pdev->dev;
208
209 ret = panel_lvds_parse_dt(lvds);
210 if (ret < 0)
211 return ret;
212
213 lvds->supply = devm_regulator_get_optional(lvds->dev, "power");
214 if (IS_ERR(lvds->supply)) {
215 ret = PTR_ERR(lvds->supply);
216
217 if (ret != -ENODEV) {
218 if (ret != -EPROBE_DEFER)
219 dev_err(lvds->dev, "failed to request regulator: %d\n",
220 ret);
221 return ret;
222 }
223
224 lvds->supply = NULL;
225 }
226
227 /* Get GPIOs and backlight controller. */
228 lvds->enable_gpio = devm_gpiod_get_optional(lvds->dev, "enable",
229 GPIOD_OUT_LOW);
230 if (IS_ERR(lvds->enable_gpio)) {
231 ret = PTR_ERR(lvds->enable_gpio);
232 dev_err(lvds->dev, "failed to request %s GPIO: %d\n",
233 "enable", ret);
234 return ret;
235 }
236
237 lvds->reset_gpio = devm_gpiod_get_optional(lvds->dev, "reset",
238 GPIOD_OUT_HIGH);
239 if (IS_ERR(lvds->reset_gpio)) {
240 ret = PTR_ERR(lvds->reset_gpio);
241 dev_err(lvds->dev, "failed to request %s GPIO: %d\n",
242 "reset", ret);
243 return ret;
244 }
245
246 np = of_parse_phandle(lvds->dev->of_node, "backlight", 0);
247 if (np) {
248 lvds->backlight = of_find_backlight_by_node(np);
249 of_node_put(np);
250
251 if (!lvds->backlight)
252 return -EPROBE_DEFER;
253 }
254
255 /*
256 * TODO: Handle all power supplies specified in the DT node in a generic
257 * way for panels that don't care about power supply ordering. LVDS
258 * panels that require a specific power sequence will need a dedicated
259 * driver.
260 */
261
262 /* Register the panel. */
263 drm_panel_init(&lvds->panel);
264 lvds->panel.dev = lvds->dev;
265 lvds->panel.funcs = &panel_lvds_funcs;
266
267 ret = drm_panel_add(&lvds->panel);
268 if (ret < 0)
269 goto error;
270
271 dev_set_drvdata(lvds->dev, lvds);
272 return 0;
273
274error:
275 put_device(&lvds->backlight->dev);
276 return ret;
277}
278
279static int panel_lvds_remove(struct platform_device *pdev)
280{
281 struct panel_lvds *lvds = dev_get_drvdata(&pdev->dev);
282
283 drm_panel_remove(&lvds->panel);
284
285 panel_lvds_disable(&lvds->panel);
286
287 if (lvds->backlight)
288 put_device(&lvds->backlight->dev);
289
290 return 0;
291}
292
293static const struct of_device_id panel_lvds_of_table[] = {
294 { .compatible = "panel-lvds", },
295 { /* Sentinel */ },
296};
297
298MODULE_DEVICE_TABLE(of, panel_lvds_of_table);
299
300static struct platform_driver panel_lvds_driver = {
301 .probe = panel_lvds_probe,
302 .remove = panel_lvds_remove,
303 .driver = {
304 .name = "panel-lvds",
305 .of_match_table = panel_lvds_of_table,
306 },
307};
308
309module_platform_driver(panel_lvds_driver);
310
311MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
312MODULE_DESCRIPTION("LVDS Panel Driver");
313MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Generic LVDS panel driver
4 *
5 * Copyright (C) 2016 Laurent Pinchart
6 * Copyright (C) 2016 Renesas Electronics Corporation
7 *
8 * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
9 */
10
11#include <linux/gpio/consumer.h>
12#include <linux/module.h>
13#include <linux/of.h>
14#include <linux/platform_device.h>
15#include <linux/regulator/consumer.h>
16#include <linux/slab.h>
17
18#include <video/display_timing.h>
19#include <video/of_display_timing.h>
20#include <video/videomode.h>
21
22#include <drm/drm_crtc.h>
23#include <drm/drm_of.h>
24#include <drm/drm_panel.h>
25
26struct 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 drm_display_mode dmode;
34 u32 bus_flags;
35 unsigned int bus_format;
36
37 struct regulator *supply;
38
39 struct gpio_desc *enable_gpio;
40 struct gpio_desc *reset_gpio;
41
42 enum drm_panel_orientation orientation;
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_unprepare(struct drm_panel *panel)
51{
52 struct panel_lvds *lvds = to_panel_lvds(panel);
53
54 if (lvds->enable_gpio)
55 gpiod_set_value_cansleep(lvds->enable_gpio, 0);
56
57 if (lvds->supply)
58 regulator_disable(lvds->supply);
59
60 return 0;
61}
62
63static int panel_lvds_prepare(struct drm_panel *panel)
64{
65 struct panel_lvds *lvds = to_panel_lvds(panel);
66
67 if (lvds->supply) {
68 int err;
69
70 err = regulator_enable(lvds->supply);
71 if (err < 0) {
72 dev_err(lvds->dev, "failed to enable supply: %d\n",
73 err);
74 return err;
75 }
76 }
77
78 if (lvds->enable_gpio)
79 gpiod_set_value_cansleep(lvds->enable_gpio, 1);
80
81 return 0;
82}
83
84static int panel_lvds_get_modes(struct drm_panel *panel,
85 struct drm_connector *connector)
86{
87 struct panel_lvds *lvds = to_panel_lvds(panel);
88 struct drm_display_mode *mode;
89
90 mode = drm_mode_duplicate(connector->dev, &lvds->dmode);
91 if (!mode)
92 return 0;
93
94 mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
95 drm_mode_probed_add(connector, mode);
96
97 connector->display_info.width_mm = lvds->dmode.width_mm;
98 connector->display_info.height_mm = lvds->dmode.height_mm;
99 drm_display_info_set_bus_formats(&connector->display_info,
100 &lvds->bus_format, 1);
101 connector->display_info.bus_flags = lvds->bus_flags;
102
103 /*
104 * TODO: Remove once all drm drivers call
105 * drm_connector_set_orientation_from_panel()
106 */
107 drm_connector_set_panel_orientation(connector, lvds->orientation);
108
109 return 1;
110}
111
112static enum drm_panel_orientation panel_lvds_get_orientation(struct drm_panel *panel)
113{
114 struct panel_lvds *lvds = to_panel_lvds(panel);
115
116 return lvds->orientation;
117}
118
119static const struct drm_panel_funcs panel_lvds_funcs = {
120 .unprepare = panel_lvds_unprepare,
121 .prepare = panel_lvds_prepare,
122 .get_modes = panel_lvds_get_modes,
123 .get_orientation = panel_lvds_get_orientation,
124};
125
126static int panel_lvds_parse_dt(struct panel_lvds *lvds)
127{
128 struct device_node *np = lvds->dev->of_node;
129 int ret;
130
131 ret = of_drm_get_panel_orientation(np, &lvds->orientation);
132 if (ret < 0) {
133 dev_err(lvds->dev, "%pOF: failed to get orientation %d\n", np, ret);
134 return ret;
135 }
136
137 ret = of_get_drm_panel_display_mode(np, &lvds->dmode, &lvds->bus_flags);
138 if (ret < 0) {
139 dev_err(lvds->dev, "%pOF: problems parsing panel-timing (%d)\n",
140 np, ret);
141 return ret;
142 }
143
144 of_property_read_string(np, "label", &lvds->label);
145
146 ret = drm_of_lvds_get_data_mapping(np);
147 if (ret < 0) {
148 dev_err(lvds->dev, "%pOF: invalid or missing %s DT property\n",
149 np, "data-mapping");
150 return ret;
151 }
152
153 lvds->bus_format = ret;
154
155 lvds->bus_flags |= of_property_read_bool(np, "data-mirror") ?
156 DRM_BUS_FLAG_DATA_LSB_TO_MSB :
157 DRM_BUS_FLAG_DATA_MSB_TO_LSB;
158
159 return 0;
160}
161
162static int panel_lvds_probe(struct platform_device *pdev)
163{
164 struct panel_lvds *lvds;
165 int ret;
166
167 lvds = devm_kzalloc(&pdev->dev, sizeof(*lvds), GFP_KERNEL);
168 if (!lvds)
169 return -ENOMEM;
170
171 lvds->dev = &pdev->dev;
172
173 ret = panel_lvds_parse_dt(lvds);
174 if (ret < 0)
175 return ret;
176
177 lvds->supply = devm_regulator_get_optional(lvds->dev, "power");
178 if (IS_ERR(lvds->supply)) {
179 ret = PTR_ERR(lvds->supply);
180
181 if (ret != -ENODEV) {
182 if (ret != -EPROBE_DEFER)
183 dev_err(lvds->dev, "failed to request regulator: %d\n",
184 ret);
185 return ret;
186 }
187
188 lvds->supply = NULL;
189 }
190
191 /* Get GPIOs and backlight controller. */
192 lvds->enable_gpio = devm_gpiod_get_optional(lvds->dev, "enable",
193 GPIOD_OUT_LOW);
194 if (IS_ERR(lvds->enable_gpio)) {
195 ret = PTR_ERR(lvds->enable_gpio);
196 dev_err(lvds->dev, "failed to request %s GPIO: %d\n",
197 "enable", ret);
198 return ret;
199 }
200
201 lvds->reset_gpio = devm_gpiod_get_optional(lvds->dev, "reset",
202 GPIOD_OUT_HIGH);
203 if (IS_ERR(lvds->reset_gpio)) {
204 ret = PTR_ERR(lvds->reset_gpio);
205 dev_err(lvds->dev, "failed to request %s GPIO: %d\n",
206 "reset", ret);
207 return ret;
208 }
209
210 /*
211 * TODO: Handle all power supplies specified in the DT node in a generic
212 * way for panels that don't care about power supply ordering. LVDS
213 * panels that require a specific power sequence will need a dedicated
214 * driver.
215 */
216
217 /* Register the panel. */
218 drm_panel_init(&lvds->panel, lvds->dev, &panel_lvds_funcs,
219 DRM_MODE_CONNECTOR_LVDS);
220
221 ret = drm_panel_of_backlight(&lvds->panel);
222 if (ret)
223 return ret;
224
225 drm_panel_add(&lvds->panel);
226
227 dev_set_drvdata(lvds->dev, lvds);
228 return 0;
229}
230
231static void panel_lvds_remove(struct platform_device *pdev)
232{
233 struct panel_lvds *lvds = platform_get_drvdata(pdev);
234
235 drm_panel_remove(&lvds->panel);
236
237 drm_panel_disable(&lvds->panel);
238}
239
240static const struct of_device_id panel_lvds_of_table[] = {
241 { .compatible = "panel-lvds", },
242 { /* Sentinel */ },
243};
244
245MODULE_DEVICE_TABLE(of, panel_lvds_of_table);
246
247static struct platform_driver panel_lvds_driver = {
248 .probe = panel_lvds_probe,
249 .remove_new = panel_lvds_remove,
250 .driver = {
251 .name = "panel-lvds",
252 .of_match_table = panel_lvds_of_table,
253 },
254};
255
256module_platform_driver(panel_lvds_driver);
257
258MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
259MODULE_DESCRIPTION("LVDS Panel Driver");
260MODULE_LICENSE("GPL");