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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2012 Texas Instruments
4 * Author: Rob Clark <robdclark@gmail.com>
5 */
6
7#include <linux/backlight.h>
8#include <linux/gpio/consumer.h>
9#include <linux/pinctrl/consumer.h>
10#include <linux/platform_device.h>
11
12#include <video/display_timing.h>
13#include <video/of_display_timing.h>
14#include <video/videomode.h>
15
16#include <drm/drm_atomic_state_helper.h>
17#include <drm/drm_connector.h>
18#include <drm/drm_modeset_helper_vtables.h>
19#include <drm/drm_probe_helper.h>
20#include <drm/drm_simple_kms_helper.h>
21
22#include "tilcdc_drv.h"
23#include "tilcdc_panel.h"
24
25struct panel_module {
26 struct tilcdc_module base;
27 struct tilcdc_panel_info *info;
28 struct display_timings *timings;
29 struct backlight_device *backlight;
30 struct gpio_desc *enable_gpio;
31};
32#define to_panel_module(x) container_of(x, struct panel_module, base)
33
34
35/*
36 * Encoder:
37 */
38
39struct panel_encoder {
40 struct drm_encoder base;
41 struct panel_module *mod;
42};
43#define to_panel_encoder(x) container_of(x, struct panel_encoder, base)
44
45static void panel_encoder_dpms(struct drm_encoder *encoder, int mode)
46{
47 struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
48 struct backlight_device *backlight = panel_encoder->mod->backlight;
49 struct gpio_desc *gpio = panel_encoder->mod->enable_gpio;
50
51 if (backlight) {
52 backlight->props.power = mode == DRM_MODE_DPMS_ON ?
53 FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
54 backlight_update_status(backlight);
55 }
56
57 if (gpio)
58 gpiod_set_value_cansleep(gpio,
59 mode == DRM_MODE_DPMS_ON ? 1 : 0);
60}
61
62static void panel_encoder_prepare(struct drm_encoder *encoder)
63{
64 panel_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
65}
66
67static void panel_encoder_commit(struct drm_encoder *encoder)
68{
69 panel_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
70}
71
72static void panel_encoder_mode_set(struct drm_encoder *encoder,
73 struct drm_display_mode *mode,
74 struct drm_display_mode *adjusted_mode)
75{
76 /* nothing needed */
77}
78
79static const struct drm_encoder_helper_funcs panel_encoder_helper_funcs = {
80 .dpms = panel_encoder_dpms,
81 .prepare = panel_encoder_prepare,
82 .commit = panel_encoder_commit,
83 .mode_set = panel_encoder_mode_set,
84};
85
86static struct drm_encoder *panel_encoder_create(struct drm_device *dev,
87 struct panel_module *mod)
88{
89 struct panel_encoder *panel_encoder;
90 struct drm_encoder *encoder;
91 int ret;
92
93 panel_encoder = devm_kzalloc(dev->dev, sizeof(*panel_encoder),
94 GFP_KERNEL);
95 if (!panel_encoder)
96 return NULL;
97
98 panel_encoder->mod = mod;
99
100 encoder = &panel_encoder->base;
101 encoder->possible_crtcs = 1;
102
103 ret = drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_LVDS);
104 if (ret < 0)
105 goto fail;
106
107 drm_encoder_helper_add(encoder, &panel_encoder_helper_funcs);
108
109 return encoder;
110
111fail:
112 drm_encoder_cleanup(encoder);
113 return NULL;
114}
115
116/*
117 * Connector:
118 */
119
120struct panel_connector {
121 struct drm_connector base;
122
123 struct drm_encoder *encoder; /* our connected encoder */
124 struct panel_module *mod;
125};
126#define to_panel_connector(x) container_of(x, struct panel_connector, base)
127
128
129static void panel_connector_destroy(struct drm_connector *connector)
130{
131 drm_connector_unregister(connector);
132 drm_connector_cleanup(connector);
133}
134
135static int panel_connector_get_modes(struct drm_connector *connector)
136{
137 struct drm_device *dev = connector->dev;
138 struct panel_connector *panel_connector = to_panel_connector(connector);
139 struct display_timings *timings = panel_connector->mod->timings;
140 int i;
141
142 for (i = 0; i < timings->num_timings; i++) {
143 struct drm_display_mode *mode;
144 struct videomode vm;
145
146 if (videomode_from_timings(timings, &vm, i))
147 break;
148
149 mode = drm_mode_create(dev);
150 if (!mode)
151 break;
152
153 drm_display_mode_from_videomode(&vm, mode);
154
155 mode->type = DRM_MODE_TYPE_DRIVER;
156
157 if (timings->native_mode == i)
158 mode->type |= DRM_MODE_TYPE_PREFERRED;
159
160 drm_mode_set_name(mode);
161 drm_mode_probed_add(connector, mode);
162 }
163
164 return i;
165}
166
167static struct drm_encoder *panel_connector_best_encoder(
168 struct drm_connector *connector)
169{
170 struct panel_connector *panel_connector = to_panel_connector(connector);
171 return panel_connector->encoder;
172}
173
174static const struct drm_connector_funcs panel_connector_funcs = {
175 .destroy = panel_connector_destroy,
176 .fill_modes = drm_helper_probe_single_connector_modes,
177 .reset = drm_atomic_helper_connector_reset,
178 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
179 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
180};
181
182static const struct drm_connector_helper_funcs panel_connector_helper_funcs = {
183 .get_modes = panel_connector_get_modes,
184 .best_encoder = panel_connector_best_encoder,
185};
186
187static struct drm_connector *panel_connector_create(struct drm_device *dev,
188 struct panel_module *mod, struct drm_encoder *encoder)
189{
190 struct panel_connector *panel_connector;
191 struct drm_connector *connector;
192 int ret;
193
194 panel_connector = devm_kzalloc(dev->dev, sizeof(*panel_connector),
195 GFP_KERNEL);
196 if (!panel_connector)
197 return NULL;
198
199 panel_connector->encoder = encoder;
200 panel_connector->mod = mod;
201
202 connector = &panel_connector->base;
203
204 drm_connector_init(dev, connector, &panel_connector_funcs,
205 DRM_MODE_CONNECTOR_LVDS);
206 drm_connector_helper_add(connector, &panel_connector_helper_funcs);
207
208 connector->interlace_allowed = 0;
209 connector->doublescan_allowed = 0;
210
211 ret = drm_connector_attach_encoder(connector, encoder);
212 if (ret)
213 goto fail;
214
215 return connector;
216
217fail:
218 panel_connector_destroy(connector);
219 return NULL;
220}
221
222/*
223 * Module:
224 */
225
226static int panel_modeset_init(struct tilcdc_module *mod, struct drm_device *dev)
227{
228 struct panel_module *panel_mod = to_panel_module(mod);
229 struct tilcdc_drm_private *priv = dev->dev_private;
230 struct drm_encoder *encoder;
231 struct drm_connector *connector;
232
233 encoder = panel_encoder_create(dev, panel_mod);
234 if (!encoder)
235 return -ENOMEM;
236
237 connector = panel_connector_create(dev, panel_mod, encoder);
238 if (!connector)
239 return -ENOMEM;
240
241 priv->encoders[priv->num_encoders++] = encoder;
242 priv->connectors[priv->num_connectors++] = connector;
243
244 tilcdc_crtc_set_panel_info(priv->crtc,
245 to_panel_encoder(encoder)->mod->info);
246
247 return 0;
248}
249
250static const struct tilcdc_module_ops panel_module_ops = {
251 .modeset_init = panel_modeset_init,
252};
253
254/*
255 * Device:
256 */
257
258/* maybe move this somewhere common if it is needed by other outputs? */
259static struct tilcdc_panel_info *of_get_panel_info(struct device_node *np)
260{
261 struct device_node *info_np;
262 struct tilcdc_panel_info *info;
263 int ret = 0;
264
265 if (!np) {
266 pr_err("%s: no devicenode given\n", __func__);
267 return NULL;
268 }
269
270 info_np = of_get_child_by_name(np, "panel-info");
271 if (!info_np) {
272 pr_err("%s: could not find panel-info node\n", __func__);
273 return NULL;
274 }
275
276 info = kzalloc(sizeof(*info), GFP_KERNEL);
277 if (!info)
278 goto put_node;
279
280 ret |= of_property_read_u32(info_np, "ac-bias", &info->ac_bias);
281 ret |= of_property_read_u32(info_np, "ac-bias-intrpt", &info->ac_bias_intrpt);
282 ret |= of_property_read_u32(info_np, "dma-burst-sz", &info->dma_burst_sz);
283 ret |= of_property_read_u32(info_np, "bpp", &info->bpp);
284 ret |= of_property_read_u32(info_np, "fdd", &info->fdd);
285 ret |= of_property_read_u32(info_np, "sync-edge", &info->sync_edge);
286 ret |= of_property_read_u32(info_np, "sync-ctrl", &info->sync_ctrl);
287 ret |= of_property_read_u32(info_np, "raster-order", &info->raster_order);
288 ret |= of_property_read_u32(info_np, "fifo-th", &info->fifo_th);
289
290 /* optional: */
291 info->tft_alt_mode = of_property_read_bool(info_np, "tft-alt-mode");
292 info->invert_pxl_clk = of_property_read_bool(info_np, "invert-pxl-clk");
293
294 if (ret) {
295 pr_err("%s: error reading panel-info properties\n", __func__);
296 kfree(info);
297 info = NULL;
298 }
299
300put_node:
301 of_node_put(info_np);
302 return info;
303}
304
305static int panel_probe(struct platform_device *pdev)
306{
307 struct device_node *node = pdev->dev.of_node;
308 struct backlight_device *backlight;
309 struct panel_module *panel_mod;
310 struct tilcdc_module *mod;
311 struct pinctrl *pinctrl;
312 int ret;
313
314 /* bail out early if no DT data: */
315 if (!node) {
316 dev_err(&pdev->dev, "device-tree data is missing\n");
317 return -ENXIO;
318 }
319
320 panel_mod = devm_kzalloc(&pdev->dev, sizeof(*panel_mod), GFP_KERNEL);
321 if (!panel_mod)
322 return -ENOMEM;
323
324 backlight = devm_of_find_backlight(&pdev->dev);
325 if (IS_ERR(backlight))
326 return PTR_ERR(backlight);
327 panel_mod->backlight = backlight;
328
329 panel_mod->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable",
330 GPIOD_OUT_LOW);
331 if (IS_ERR(panel_mod->enable_gpio)) {
332 ret = PTR_ERR(panel_mod->enable_gpio);
333 dev_err(&pdev->dev, "failed to request enable GPIO\n");
334 goto fail_backlight;
335 }
336
337 if (panel_mod->enable_gpio)
338 dev_info(&pdev->dev, "found enable GPIO\n");
339
340 mod = &panel_mod->base;
341 pdev->dev.platform_data = mod;
342
343 tilcdc_module_init(mod, "panel", &panel_module_ops);
344
345 pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
346 if (IS_ERR(pinctrl))
347 dev_warn(&pdev->dev, "pins are not configured\n");
348
349 panel_mod->timings = of_get_display_timings(node);
350 if (!panel_mod->timings) {
351 dev_err(&pdev->dev, "could not get panel timings\n");
352 ret = -EINVAL;
353 goto fail_free;
354 }
355
356 panel_mod->info = of_get_panel_info(node);
357 if (!panel_mod->info) {
358 dev_err(&pdev->dev, "could not get panel info\n");
359 ret = -EINVAL;
360 goto fail_timings;
361 }
362
363 return 0;
364
365fail_timings:
366 display_timings_release(panel_mod->timings);
367
368fail_free:
369 tilcdc_module_cleanup(mod);
370
371fail_backlight:
372 if (panel_mod->backlight)
373 put_device(&panel_mod->backlight->dev);
374 return ret;
375}
376
377static void panel_remove(struct platform_device *pdev)
378{
379 struct tilcdc_module *mod = dev_get_platdata(&pdev->dev);
380 struct panel_module *panel_mod = to_panel_module(mod);
381 struct backlight_device *backlight = panel_mod->backlight;
382
383 if (backlight)
384 put_device(&backlight->dev);
385
386 display_timings_release(panel_mod->timings);
387
388 tilcdc_module_cleanup(mod);
389 kfree(panel_mod->info);
390}
391
392static const struct of_device_id panel_of_match[] = {
393 { .compatible = "ti,tilcdc,panel", },
394 { },
395};
396
397static struct platform_driver panel_driver = {
398 .probe = panel_probe,
399 .remove_new = panel_remove,
400 .driver = {
401 .name = "tilcdc-panel",
402 .of_match_table = panel_of_match,
403 },
404};
405
406int __init tilcdc_panel_init(void)
407{
408 return platform_driver_register(&panel_driver);
409}
410
411void __exit tilcdc_panel_fini(void)
412{
413 platform_driver_unregister(&panel_driver);
414}
1/*
2 * Copyright (C) 2012 Texas Instruments
3 * Author: Rob Clark <robdclark@gmail.com>
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 as published by
7 * the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program. If not, see <http://www.gnu.org/licenses/>.
16 */
17
18#include <linux/pinctrl/pinmux.h>
19#include <linux/pinctrl/consumer.h>
20#include <linux/backlight.h>
21#include <linux/gpio/consumer.h>
22#include <video/display_timing.h>
23#include <video/of_display_timing.h>
24#include <video/videomode.h>
25#include <drm/drm_atomic_helper.h>
26
27#include "tilcdc_drv.h"
28#include "tilcdc_panel.h"
29
30struct panel_module {
31 struct tilcdc_module base;
32 struct tilcdc_panel_info *info;
33 struct display_timings *timings;
34 struct backlight_device *backlight;
35 struct gpio_desc *enable_gpio;
36};
37#define to_panel_module(x) container_of(x, struct panel_module, base)
38
39
40/*
41 * Encoder:
42 */
43
44struct panel_encoder {
45 struct drm_encoder base;
46 struct panel_module *mod;
47};
48#define to_panel_encoder(x) container_of(x, struct panel_encoder, base)
49
50static void panel_encoder_dpms(struct drm_encoder *encoder, int mode)
51{
52 struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
53 struct backlight_device *backlight = panel_encoder->mod->backlight;
54 struct gpio_desc *gpio = panel_encoder->mod->enable_gpio;
55
56 if (backlight) {
57 backlight->props.power = mode == DRM_MODE_DPMS_ON ?
58 FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
59 backlight_update_status(backlight);
60 }
61
62 if (gpio)
63 gpiod_set_value_cansleep(gpio,
64 mode == DRM_MODE_DPMS_ON ? 1 : 0);
65}
66
67static void panel_encoder_prepare(struct drm_encoder *encoder)
68{
69 panel_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
70}
71
72static void panel_encoder_commit(struct drm_encoder *encoder)
73{
74 panel_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
75}
76
77static void panel_encoder_mode_set(struct drm_encoder *encoder,
78 struct drm_display_mode *mode,
79 struct drm_display_mode *adjusted_mode)
80{
81 /* nothing needed */
82}
83
84static const struct drm_encoder_funcs panel_encoder_funcs = {
85 .destroy = drm_encoder_cleanup,
86};
87
88static const struct drm_encoder_helper_funcs panel_encoder_helper_funcs = {
89 .dpms = panel_encoder_dpms,
90 .prepare = panel_encoder_prepare,
91 .commit = panel_encoder_commit,
92 .mode_set = panel_encoder_mode_set,
93};
94
95static struct drm_encoder *panel_encoder_create(struct drm_device *dev,
96 struct panel_module *mod)
97{
98 struct panel_encoder *panel_encoder;
99 struct drm_encoder *encoder;
100 int ret;
101
102 panel_encoder = devm_kzalloc(dev->dev, sizeof(*panel_encoder),
103 GFP_KERNEL);
104 if (!panel_encoder) {
105 dev_err(dev->dev, "allocation failed\n");
106 return NULL;
107 }
108
109 panel_encoder->mod = mod;
110
111 encoder = &panel_encoder->base;
112 encoder->possible_crtcs = 1;
113
114 ret = drm_encoder_init(dev, encoder, &panel_encoder_funcs,
115 DRM_MODE_ENCODER_LVDS, NULL);
116 if (ret < 0)
117 goto fail;
118
119 drm_encoder_helper_add(encoder, &panel_encoder_helper_funcs);
120
121 return encoder;
122
123fail:
124 drm_encoder_cleanup(encoder);
125 return NULL;
126}
127
128/*
129 * Connector:
130 */
131
132struct panel_connector {
133 struct drm_connector base;
134
135 struct drm_encoder *encoder; /* our connected encoder */
136 struct panel_module *mod;
137};
138#define to_panel_connector(x) container_of(x, struct panel_connector, base)
139
140
141static void panel_connector_destroy(struct drm_connector *connector)
142{
143 drm_connector_unregister(connector);
144 drm_connector_cleanup(connector);
145}
146
147static int panel_connector_get_modes(struct drm_connector *connector)
148{
149 struct drm_device *dev = connector->dev;
150 struct panel_connector *panel_connector = to_panel_connector(connector);
151 struct display_timings *timings = panel_connector->mod->timings;
152 int i;
153
154 for (i = 0; i < timings->num_timings; i++) {
155 struct drm_display_mode *mode = drm_mode_create(dev);
156 struct videomode vm;
157
158 if (videomode_from_timings(timings, &vm, i))
159 break;
160
161 drm_display_mode_from_videomode(&vm, mode);
162
163 mode->type = DRM_MODE_TYPE_DRIVER;
164
165 if (timings->native_mode == i)
166 mode->type |= DRM_MODE_TYPE_PREFERRED;
167
168 drm_mode_set_name(mode);
169 drm_mode_probed_add(connector, mode);
170 }
171
172 return i;
173}
174
175static int panel_connector_mode_valid(struct drm_connector *connector,
176 struct drm_display_mode *mode)
177{
178 struct tilcdc_drm_private *priv = connector->dev->dev_private;
179 /* our only constraints are what the crtc can generate: */
180 return tilcdc_crtc_mode_valid(priv->crtc, mode);
181}
182
183static struct drm_encoder *panel_connector_best_encoder(
184 struct drm_connector *connector)
185{
186 struct panel_connector *panel_connector = to_panel_connector(connector);
187 return panel_connector->encoder;
188}
189
190static const struct drm_connector_funcs panel_connector_funcs = {
191 .destroy = panel_connector_destroy,
192 .dpms = drm_atomic_helper_connector_dpms,
193 .fill_modes = drm_helper_probe_single_connector_modes,
194 .reset = drm_atomic_helper_connector_reset,
195 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
196 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
197};
198
199static const struct drm_connector_helper_funcs panel_connector_helper_funcs = {
200 .get_modes = panel_connector_get_modes,
201 .mode_valid = panel_connector_mode_valid,
202 .best_encoder = panel_connector_best_encoder,
203};
204
205static struct drm_connector *panel_connector_create(struct drm_device *dev,
206 struct panel_module *mod, struct drm_encoder *encoder)
207{
208 struct panel_connector *panel_connector;
209 struct drm_connector *connector;
210 int ret;
211
212 panel_connector = devm_kzalloc(dev->dev, sizeof(*panel_connector),
213 GFP_KERNEL);
214 if (!panel_connector) {
215 dev_err(dev->dev, "allocation failed\n");
216 return NULL;
217 }
218
219 panel_connector->encoder = encoder;
220 panel_connector->mod = mod;
221
222 connector = &panel_connector->base;
223
224 drm_connector_init(dev, connector, &panel_connector_funcs,
225 DRM_MODE_CONNECTOR_LVDS);
226 drm_connector_helper_add(connector, &panel_connector_helper_funcs);
227
228 connector->interlace_allowed = 0;
229 connector->doublescan_allowed = 0;
230
231 ret = drm_mode_connector_attach_encoder(connector, encoder);
232 if (ret)
233 goto fail;
234
235 return connector;
236
237fail:
238 panel_connector_destroy(connector);
239 return NULL;
240}
241
242/*
243 * Module:
244 */
245
246static int panel_modeset_init(struct tilcdc_module *mod, struct drm_device *dev)
247{
248 struct panel_module *panel_mod = to_panel_module(mod);
249 struct tilcdc_drm_private *priv = dev->dev_private;
250 struct drm_encoder *encoder;
251 struct drm_connector *connector;
252
253 encoder = panel_encoder_create(dev, panel_mod);
254 if (!encoder)
255 return -ENOMEM;
256
257 connector = panel_connector_create(dev, panel_mod, encoder);
258 if (!connector)
259 return -ENOMEM;
260
261 priv->encoders[priv->num_encoders++] = encoder;
262 priv->connectors[priv->num_connectors++] = connector;
263
264 tilcdc_crtc_set_panel_info(priv->crtc,
265 to_panel_encoder(encoder)->mod->info);
266
267 return 0;
268}
269
270static const struct tilcdc_module_ops panel_module_ops = {
271 .modeset_init = panel_modeset_init,
272};
273
274/*
275 * Device:
276 */
277
278/* maybe move this somewhere common if it is needed by other outputs? */
279static struct tilcdc_panel_info *of_get_panel_info(struct device_node *np)
280{
281 struct device_node *info_np;
282 struct tilcdc_panel_info *info;
283 int ret = 0;
284
285 if (!np) {
286 pr_err("%s: no devicenode given\n", __func__);
287 return NULL;
288 }
289
290 info_np = of_get_child_by_name(np, "panel-info");
291 if (!info_np) {
292 pr_err("%s: could not find panel-info node\n", __func__);
293 return NULL;
294 }
295
296 info = kzalloc(sizeof(*info), GFP_KERNEL);
297 if (!info) {
298 pr_err("%s: allocation failed\n", __func__);
299 of_node_put(info_np);
300 return NULL;
301 }
302
303 ret |= of_property_read_u32(info_np, "ac-bias", &info->ac_bias);
304 ret |= of_property_read_u32(info_np, "ac-bias-intrpt", &info->ac_bias_intrpt);
305 ret |= of_property_read_u32(info_np, "dma-burst-sz", &info->dma_burst_sz);
306 ret |= of_property_read_u32(info_np, "bpp", &info->bpp);
307 ret |= of_property_read_u32(info_np, "fdd", &info->fdd);
308 ret |= of_property_read_u32(info_np, "sync-edge", &info->sync_edge);
309 ret |= of_property_read_u32(info_np, "sync-ctrl", &info->sync_ctrl);
310 ret |= of_property_read_u32(info_np, "raster-order", &info->raster_order);
311 ret |= of_property_read_u32(info_np, "fifo-th", &info->fifo_th);
312
313 /* optional: */
314 info->tft_alt_mode = of_property_read_bool(info_np, "tft-alt-mode");
315 info->invert_pxl_clk = of_property_read_bool(info_np, "invert-pxl-clk");
316
317 if (ret) {
318 pr_err("%s: error reading panel-info properties\n", __func__);
319 kfree(info);
320 of_node_put(info_np);
321 return NULL;
322 }
323 of_node_put(info_np);
324
325 return info;
326}
327
328static int panel_probe(struct platform_device *pdev)
329{
330 struct device_node *bl_node, *node = pdev->dev.of_node;
331 struct panel_module *panel_mod;
332 struct tilcdc_module *mod;
333 struct pinctrl *pinctrl;
334 int ret;
335
336 /* bail out early if no DT data: */
337 if (!node) {
338 dev_err(&pdev->dev, "device-tree data is missing\n");
339 return -ENXIO;
340 }
341
342 panel_mod = devm_kzalloc(&pdev->dev, sizeof(*panel_mod), GFP_KERNEL);
343 if (!panel_mod)
344 return -ENOMEM;
345
346 bl_node = of_parse_phandle(node, "backlight", 0);
347 if (bl_node) {
348 panel_mod->backlight = of_find_backlight_by_node(bl_node);
349 of_node_put(bl_node);
350
351 if (!panel_mod->backlight)
352 return -EPROBE_DEFER;
353
354 dev_info(&pdev->dev, "found backlight\n");
355 }
356
357 panel_mod->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable",
358 GPIOD_OUT_LOW);
359 if (IS_ERR(panel_mod->enable_gpio)) {
360 ret = PTR_ERR(panel_mod->enable_gpio);
361 dev_err(&pdev->dev, "failed to request enable GPIO\n");
362 goto fail_backlight;
363 }
364
365 if (panel_mod->enable_gpio)
366 dev_info(&pdev->dev, "found enable GPIO\n");
367
368 mod = &panel_mod->base;
369 pdev->dev.platform_data = mod;
370
371 tilcdc_module_init(mod, "panel", &panel_module_ops);
372
373 pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
374 if (IS_ERR(pinctrl))
375 dev_warn(&pdev->dev, "pins are not configured\n");
376
377 panel_mod->timings = of_get_display_timings(node);
378 if (!panel_mod->timings) {
379 dev_err(&pdev->dev, "could not get panel timings\n");
380 ret = -EINVAL;
381 goto fail_free;
382 }
383
384 panel_mod->info = of_get_panel_info(node);
385 if (!panel_mod->info) {
386 dev_err(&pdev->dev, "could not get panel info\n");
387 ret = -EINVAL;
388 goto fail_timings;
389 }
390
391 return 0;
392
393fail_timings:
394 display_timings_release(panel_mod->timings);
395
396fail_free:
397 tilcdc_module_cleanup(mod);
398
399fail_backlight:
400 if (panel_mod->backlight)
401 put_device(&panel_mod->backlight->dev);
402 return ret;
403}
404
405static int panel_remove(struct platform_device *pdev)
406{
407 struct tilcdc_module *mod = dev_get_platdata(&pdev->dev);
408 struct panel_module *panel_mod = to_panel_module(mod);
409 struct backlight_device *backlight = panel_mod->backlight;
410
411 if (backlight)
412 put_device(&backlight->dev);
413
414 display_timings_release(panel_mod->timings);
415
416 tilcdc_module_cleanup(mod);
417 kfree(panel_mod->info);
418
419 return 0;
420}
421
422static struct of_device_id panel_of_match[] = {
423 { .compatible = "ti,tilcdc,panel", },
424 { },
425};
426
427struct platform_driver panel_driver = {
428 .probe = panel_probe,
429 .remove = panel_remove,
430 .driver = {
431 .owner = THIS_MODULE,
432 .name = "panel",
433 .of_match_table = panel_of_match,
434 },
435};
436
437int __init tilcdc_panel_init(void)
438{
439 return platform_driver_register(&panel_driver);
440}
441
442void __exit tilcdc_panel_fini(void)
443{
444 platform_driver_unregister(&panel_driver);
445}