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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/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");
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_platform.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_panel.h>
24
25struct panel_lvds {
26 struct drm_panel panel;
27 struct device *dev;
28
29 const char *label;
30 unsigned int width;
31 unsigned int height;
32 struct videomode video_mode;
33 unsigned int bus_format;
34 bool data_mirror;
35
36 struct regulator *supply;
37
38 struct gpio_desc *enable_gpio;
39 struct gpio_desc *reset_gpio;
40};
41
42static inline struct panel_lvds *to_panel_lvds(struct drm_panel *panel)
43{
44 return container_of(panel, struct panel_lvds, panel);
45}
46
47static int panel_lvds_unprepare(struct drm_panel *panel)
48{
49 struct panel_lvds *lvds = to_panel_lvds(panel);
50
51 if (lvds->enable_gpio)
52 gpiod_set_value_cansleep(lvds->enable_gpio, 0);
53
54 if (lvds->supply)
55 regulator_disable(lvds->supply);
56
57 return 0;
58}
59
60static int panel_lvds_prepare(struct drm_panel *panel)
61{
62 struct panel_lvds *lvds = to_panel_lvds(panel);
63
64 if (lvds->supply) {
65 int err;
66
67 err = regulator_enable(lvds->supply);
68 if (err < 0) {
69 dev_err(lvds->dev, "failed to enable supply: %d\n",
70 err);
71 return err;
72 }
73 }
74
75 if (lvds->enable_gpio)
76 gpiod_set_value_cansleep(lvds->enable_gpio, 1);
77
78 return 0;
79}
80
81static int panel_lvds_get_modes(struct drm_panel *panel,
82 struct drm_connector *connector)
83{
84 struct panel_lvds *lvds = to_panel_lvds(panel);
85 struct drm_display_mode *mode;
86
87 mode = drm_mode_create(connector->dev);
88 if (!mode)
89 return 0;
90
91 drm_display_mode_from_videomode(&lvds->video_mode, mode);
92 mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
93 drm_mode_probed_add(connector, mode);
94
95 connector->display_info.width_mm = lvds->width;
96 connector->display_info.height_mm = lvds->height;
97 drm_display_info_set_bus_formats(&connector->display_info,
98 &lvds->bus_format, 1);
99 connector->display_info.bus_flags = lvds->data_mirror
100 ? DRM_BUS_FLAG_DATA_LSB_TO_MSB
101 : DRM_BUS_FLAG_DATA_MSB_TO_LSB;
102
103 return 1;
104}
105
106static const struct drm_panel_funcs panel_lvds_funcs = {
107 .unprepare = panel_lvds_unprepare,
108 .prepare = panel_lvds_prepare,
109 .get_modes = panel_lvds_get_modes,
110};
111
112static int panel_lvds_parse_dt(struct panel_lvds *lvds)
113{
114 struct device_node *np = lvds->dev->of_node;
115 struct display_timing timing;
116 const char *mapping;
117 int ret;
118
119 ret = of_get_display_timing(np, "panel-timing", &timing);
120 if (ret < 0) {
121 dev_err(lvds->dev, "%pOF: problems parsing panel-timing (%d)\n",
122 np, ret);
123 return ret;
124 }
125
126 videomode_from_timing(&timing, &lvds->video_mode);
127
128 ret = of_property_read_u32(np, "width-mm", &lvds->width);
129 if (ret < 0) {
130 dev_err(lvds->dev, "%pOF: invalid or missing %s DT property\n",
131 np, "width-mm");
132 return -ENODEV;
133 }
134 ret = of_property_read_u32(np, "height-mm", &lvds->height);
135 if (ret < 0) {
136 dev_err(lvds->dev, "%pOF: invalid or missing %s DT property\n",
137 np, "height-mm");
138 return -ENODEV;
139 }
140
141 of_property_read_string(np, "label", &lvds->label);
142
143 ret = of_property_read_string(np, "data-mapping", &mapping);
144 if (ret < 0) {
145 dev_err(lvds->dev, "%pOF: invalid or missing %s DT property\n",
146 np, "data-mapping");
147 return -ENODEV;
148 }
149
150 if (!strcmp(mapping, "jeida-18")) {
151 lvds->bus_format = MEDIA_BUS_FMT_RGB666_1X7X3_SPWG;
152 } else if (!strcmp(mapping, "jeida-24")) {
153 lvds->bus_format = MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA;
154 } else if (!strcmp(mapping, "vesa-24")) {
155 lvds->bus_format = MEDIA_BUS_FMT_RGB888_1X7X4_SPWG;
156 } else {
157 dev_err(lvds->dev, "%pOF: invalid or missing %s DT property\n",
158 np, "data-mapping");
159 return -EINVAL;
160 }
161
162 lvds->data_mirror = of_property_read_bool(np, "data-mirror");
163
164 return 0;
165}
166
167static int panel_lvds_probe(struct platform_device *pdev)
168{
169 struct panel_lvds *lvds;
170 int ret;
171
172 lvds = devm_kzalloc(&pdev->dev, sizeof(*lvds), GFP_KERNEL);
173 if (!lvds)
174 return -ENOMEM;
175
176 lvds->dev = &pdev->dev;
177
178 ret = panel_lvds_parse_dt(lvds);
179 if (ret < 0)
180 return ret;
181
182 lvds->supply = devm_regulator_get_optional(lvds->dev, "power");
183 if (IS_ERR(lvds->supply)) {
184 ret = PTR_ERR(lvds->supply);
185
186 if (ret != -ENODEV) {
187 if (ret != -EPROBE_DEFER)
188 dev_err(lvds->dev, "failed to request regulator: %d\n",
189 ret);
190 return ret;
191 }
192
193 lvds->supply = NULL;
194 }
195
196 /* Get GPIOs and backlight controller. */
197 lvds->enable_gpio = devm_gpiod_get_optional(lvds->dev, "enable",
198 GPIOD_OUT_LOW);
199 if (IS_ERR(lvds->enable_gpio)) {
200 ret = PTR_ERR(lvds->enable_gpio);
201 dev_err(lvds->dev, "failed to request %s GPIO: %d\n",
202 "enable", ret);
203 return ret;
204 }
205
206 lvds->reset_gpio = devm_gpiod_get_optional(lvds->dev, "reset",
207 GPIOD_OUT_HIGH);
208 if (IS_ERR(lvds->reset_gpio)) {
209 ret = PTR_ERR(lvds->reset_gpio);
210 dev_err(lvds->dev, "failed to request %s GPIO: %d\n",
211 "reset", ret);
212 return ret;
213 }
214
215 /*
216 * TODO: Handle all power supplies specified in the DT node in a generic
217 * way for panels that don't care about power supply ordering. LVDS
218 * panels that require a specific power sequence will need a dedicated
219 * driver.
220 */
221
222 /* Register the panel. */
223 drm_panel_init(&lvds->panel, lvds->dev, &panel_lvds_funcs,
224 DRM_MODE_CONNECTOR_LVDS);
225
226 ret = drm_panel_of_backlight(&lvds->panel);
227 if (ret)
228 return ret;
229
230 ret = drm_panel_add(&lvds->panel);
231 if (ret < 0)
232 return ret;
233
234 dev_set_drvdata(lvds->dev, lvds);
235 return 0;
236}
237
238static int panel_lvds_remove(struct platform_device *pdev)
239{
240 struct panel_lvds *lvds = dev_get_drvdata(&pdev->dev);
241
242 drm_panel_remove(&lvds->panel);
243
244 drm_panel_disable(&lvds->panel);
245
246 return 0;
247}
248
249static const struct of_device_id panel_lvds_of_table[] = {
250 { .compatible = "panel-lvds", },
251 { /* Sentinel */ },
252};
253
254MODULE_DEVICE_TABLE(of, panel_lvds_of_table);
255
256static struct platform_driver panel_lvds_driver = {
257 .probe = panel_lvds_probe,
258 .remove = panel_lvds_remove,
259 .driver = {
260 .name = "panel-lvds",
261 .of_match_table = panel_lvds_of_table,
262 },
263};
264
265module_platform_driver(panel_lvds_driver);
266
267MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
268MODULE_DESCRIPTION("LVDS Panel Driver");
269MODULE_LICENSE("GPL");