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/gpio.h>
  8#include <linux/mod_devicetable.h>
  9#include <linux/of_gpio.h>
 10#include <linux/pinctrl/consumer.h>
 11#include <linux/platform_device.h>
 12
 13#include <drm/drm_atomic_helper.h>
 14#include <drm/drm_encoder.h>
 15#include <drm/drm_modeset_helper_vtables.h>
 16#include <drm/drm_probe_helper.h>
 17
 18#include "tilcdc_drv.h"
 19#include "tilcdc_tfp410.h"
 20
 21struct tfp410_module {
 22	struct tilcdc_module base;
 23	struct i2c_adapter *i2c;
 24	int gpio;
 25};
 26#define to_tfp410_module(x) container_of(x, struct tfp410_module, base)
 27
 28
 29static const struct tilcdc_panel_info dvi_info = {
 30		.ac_bias                = 255,
 31		.ac_bias_intrpt         = 0,
 32		.dma_burst_sz           = 16,
 33		.bpp                    = 16,
 34		.fdd                    = 0x80,
 35		.tft_alt_mode           = 0,
 36		.sync_edge              = 0,
 37		.sync_ctrl              = 1,
 38		.raster_order           = 0,
 39};
 40
 41/*
 42 * Encoder:
 43 */
 44
 45struct tfp410_encoder {
 46	struct drm_encoder base;
 47	struct tfp410_module *mod;
 48	int dpms;
 49};
 50#define to_tfp410_encoder(x) container_of(x, struct tfp410_encoder, base)
 51
 52static void tfp410_encoder_dpms(struct drm_encoder *encoder, int mode)
 53{
 54	struct tfp410_encoder *tfp410_encoder = to_tfp410_encoder(encoder);
 55
 56	if (tfp410_encoder->dpms == mode)
 57		return;
 58
 59	if (mode == DRM_MODE_DPMS_ON) {
 60		DBG("Power on");
 61		gpio_direction_output(tfp410_encoder->mod->gpio, 1);
 62	} else {
 63		DBG("Power off");
 64		gpio_direction_output(tfp410_encoder->mod->gpio, 0);
 65	}
 66
 67	tfp410_encoder->dpms = mode;
 68}
 69
 70static void tfp410_encoder_prepare(struct drm_encoder *encoder)
 71{
 72	tfp410_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
 73}
 74
 75static void tfp410_encoder_commit(struct drm_encoder *encoder)
 76{
 77	tfp410_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
 78}
 79
 80static void tfp410_encoder_mode_set(struct drm_encoder *encoder,
 81		struct drm_display_mode *mode,
 82		struct drm_display_mode *adjusted_mode)
 83{
 84	/* nothing needed */
 85}
 86
 87static const struct drm_encoder_funcs tfp410_encoder_funcs = {
 88		.destroy        = drm_encoder_cleanup,
 89};
 90
 91static const struct drm_encoder_helper_funcs tfp410_encoder_helper_funcs = {
 92		.dpms           = tfp410_encoder_dpms,
 93		.prepare        = tfp410_encoder_prepare,
 94		.commit         = tfp410_encoder_commit,
 95		.mode_set       = tfp410_encoder_mode_set,
 96};
 97
 98static struct drm_encoder *tfp410_encoder_create(struct drm_device *dev,
 99		struct tfp410_module *mod)
100{
101	struct tfp410_encoder *tfp410_encoder;
102	struct drm_encoder *encoder;
103	int ret;
104
105	tfp410_encoder = devm_kzalloc(dev->dev, sizeof(*tfp410_encoder),
106				      GFP_KERNEL);
107	if (!tfp410_encoder)
108		return NULL;
109
110	tfp410_encoder->dpms = DRM_MODE_DPMS_OFF;
111	tfp410_encoder->mod = mod;
112
113	encoder = &tfp410_encoder->base;
114	encoder->possible_crtcs = 1;
115
116	ret = drm_encoder_init(dev, encoder, &tfp410_encoder_funcs,
117			DRM_MODE_ENCODER_TMDS, NULL);
118	if (ret < 0)
119		goto fail;
120
121	drm_encoder_helper_add(encoder, &tfp410_encoder_helper_funcs);
122
123	return encoder;
124
125fail:
126	drm_encoder_cleanup(encoder);
127	return NULL;
128}
129
130/*
131 * Connector:
132 */
133
134struct tfp410_connector {
135	struct drm_connector base;
136
137	struct drm_encoder *encoder;  /* our connected encoder */
138	struct tfp410_module *mod;
139};
140#define to_tfp410_connector(x) container_of(x, struct tfp410_connector, base)
141
142
143static void tfp410_connector_destroy(struct drm_connector *connector)
144{
145	drm_connector_unregister(connector);
146	drm_connector_cleanup(connector);
147}
148
149static enum drm_connector_status tfp410_connector_detect(
150		struct drm_connector *connector,
151		bool force)
152{
153	struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
154
155	if (drm_probe_ddc(tfp410_connector->mod->i2c))
156		return connector_status_connected;
157
158	return connector_status_unknown;
159}
160
161static int tfp410_connector_get_modes(struct drm_connector *connector)
162{
163	struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
164	struct edid *edid;
165	int ret = 0;
166
167	edid = drm_get_edid(connector, tfp410_connector->mod->i2c);
168
169	drm_connector_update_edid_property(connector, edid);
170
171	if (edid) {
172		ret = drm_add_edid_modes(connector, edid);
173		kfree(edid);
174	}
175
176	return ret;
177}
178
179static struct drm_encoder *tfp410_connector_best_encoder(
180		struct drm_connector *connector)
181{
182	struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
183	return tfp410_connector->encoder;
184}
185
186static const struct drm_connector_funcs tfp410_connector_funcs = {
187	.destroy            = tfp410_connector_destroy,
188	.detect             = tfp410_connector_detect,
189	.fill_modes         = drm_helper_probe_single_connector_modes,
190	.reset              = drm_atomic_helper_connector_reset,
191	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
192	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
193};
194
195static const struct drm_connector_helper_funcs tfp410_connector_helper_funcs = {
196	.get_modes          = tfp410_connector_get_modes,
197	.best_encoder       = tfp410_connector_best_encoder,
198};
199
200static struct drm_connector *tfp410_connector_create(struct drm_device *dev,
201		struct tfp410_module *mod, struct drm_encoder *encoder)
202{
203	struct tfp410_connector *tfp410_connector;
204	struct drm_connector *connector;
205	int ret;
206
207	tfp410_connector = devm_kzalloc(dev->dev, sizeof(*tfp410_connector),
208					GFP_KERNEL);
209	if (!tfp410_connector)
210		return NULL;
211
212	tfp410_connector->encoder = encoder;
213	tfp410_connector->mod = mod;
214
215	connector = &tfp410_connector->base;
216
217	drm_connector_init(dev, connector, &tfp410_connector_funcs,
218			DRM_MODE_CONNECTOR_DVID);
219	drm_connector_helper_add(connector, &tfp410_connector_helper_funcs);
220
221	connector->polled = DRM_CONNECTOR_POLL_CONNECT |
222			DRM_CONNECTOR_POLL_DISCONNECT;
223
224	connector->interlace_allowed = 0;
225	connector->doublescan_allowed = 0;
226
227	ret = drm_connector_attach_encoder(connector, encoder);
228	if (ret)
229		goto fail;
230
231	return connector;
232
233fail:
234	tfp410_connector_destroy(connector);
235	return NULL;
236}
237
238/*
239 * Module:
240 */
241
242static int tfp410_modeset_init(struct tilcdc_module *mod, struct drm_device *dev)
243{
244	struct tfp410_module *tfp410_mod = to_tfp410_module(mod);
245	struct tilcdc_drm_private *priv = dev->dev_private;
246	struct drm_encoder *encoder;
247	struct drm_connector *connector;
248
249	encoder = tfp410_encoder_create(dev, tfp410_mod);
250	if (!encoder)
251		return -ENOMEM;
252
253	connector = tfp410_connector_create(dev, tfp410_mod, encoder);
254	if (!connector)
255		return -ENOMEM;
256
257	priv->encoders[priv->num_encoders++] = encoder;
258	priv->connectors[priv->num_connectors++] = connector;
259
260	tilcdc_crtc_set_panel_info(priv->crtc, &dvi_info);
261	return 0;
262}
263
264static const struct tilcdc_module_ops tfp410_module_ops = {
265		.modeset_init = tfp410_modeset_init,
266};
267
268/*
269 * Device:
270 */
271
272static int tfp410_probe(struct platform_device *pdev)
273{
274	struct device_node *node = pdev->dev.of_node;
275	struct device_node *i2c_node;
276	struct tfp410_module *tfp410_mod;
277	struct tilcdc_module *mod;
278	struct pinctrl *pinctrl;
279	uint32_t i2c_phandle;
280	int ret = -EINVAL;
281
282	/* bail out early if no DT data: */
283	if (!node) {
284		dev_err(&pdev->dev, "device-tree data is missing\n");
285		return -ENXIO;
286	}
287
288	tfp410_mod = devm_kzalloc(&pdev->dev, sizeof(*tfp410_mod), GFP_KERNEL);
289	if (!tfp410_mod)
290		return -ENOMEM;
291
292	mod = &tfp410_mod->base;
293	pdev->dev.platform_data = mod;
294
295	tilcdc_module_init(mod, "tfp410", &tfp410_module_ops);
296
297	pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
298	if (IS_ERR(pinctrl))
299		dev_warn(&pdev->dev, "pins are not configured\n");
300
301	if (of_property_read_u32(node, "i2c", &i2c_phandle)) {
302		dev_err(&pdev->dev, "could not get i2c bus phandle\n");
303		goto fail;
304	}
305
306	i2c_node = of_find_node_by_phandle(i2c_phandle);
307	if (!i2c_node) {
308		dev_err(&pdev->dev, "could not get i2c bus node\n");
309		goto fail;
310	}
311
312	tfp410_mod->i2c = of_find_i2c_adapter_by_node(i2c_node);
313	if (!tfp410_mod->i2c) {
314		dev_err(&pdev->dev, "could not get i2c\n");
315		of_node_put(i2c_node);
316		goto fail;
317	}
318
319	of_node_put(i2c_node);
320
321	tfp410_mod->gpio = of_get_named_gpio_flags(node, "powerdn-gpio",
322			0, NULL);
323	if (tfp410_mod->gpio < 0) {
324		dev_warn(&pdev->dev, "No power down GPIO\n");
325	} else {
326		ret = gpio_request(tfp410_mod->gpio, "DVI_PDn");
327		if (ret) {
328			dev_err(&pdev->dev, "could not get DVI_PDn gpio\n");
329			goto fail_adapter;
330		}
331	}
332
333	return 0;
334
335fail_adapter:
336	i2c_put_adapter(tfp410_mod->i2c);
337
338fail:
339	tilcdc_module_cleanup(mod);
340	return ret;
341}
342
343static int tfp410_remove(struct platform_device *pdev)
344{
345	struct tilcdc_module *mod = dev_get_platdata(&pdev->dev);
346	struct tfp410_module *tfp410_mod = to_tfp410_module(mod);
347
348	i2c_put_adapter(tfp410_mod->i2c);
349	gpio_free(tfp410_mod->gpio);
350
351	tilcdc_module_cleanup(mod);
352
353	return 0;
354}
355
356static const struct of_device_id tfp410_of_match[] = {
357		{ .compatible = "ti,tilcdc,tfp410", },
358		{ },
359};
360
361struct platform_driver tfp410_driver = {
362	.probe = tfp410_probe,
363	.remove = tfp410_remove,
364	.driver = {
365		.owner = THIS_MODULE,
366		.name = "tfp410",
367		.of_match_table = tfp410_of_match,
368	},
369};
370
371int __init tilcdc_tfp410_init(void)
372{
373	return platform_driver_register(&tfp410_driver);
374}
375
376void __exit tilcdc_tfp410_fini(void)
377{
378	platform_driver_unregister(&tfp410_driver);
379}