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}
415