1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * TPD12S015 HDMI ESD protection & level shifter chip driver
4 *
5 * Copyright (C) 2013 Texas Instruments
6 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
7 */
8
9#include <linux/completion.h>
10#include <linux/delay.h>
11#include <linux/module.h>
12#include <linux/mod_devicetable.h>
13#include <linux/slab.h>
14#include <linux/platform_device.h>
15#include <linux/gpio/consumer.h>
16
17#include <video/omapfb_dss.h>
18
19struct panel_drv_data {
20	struct omap_dss_device dssdev;
21	struct omap_dss_device *in;
22
23	struct gpio_desc *ct_cp_hpd_gpio;
24	struct gpio_desc *ls_oe_gpio;
25	struct gpio_desc *hpd_gpio;
26
27	struct omap_video_timings timings;
28};
29
30#define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)
31
32static int tpd_connect(struct omap_dss_device *dssdev,
33		struct omap_dss_device *dst)
34{
35	struct panel_drv_data *ddata = to_panel_data(dssdev);
36	struct omap_dss_device *in = ddata->in;
37	int r;
38
39	r = in->ops.hdmi->connect(in, dssdev);
40	if (r)
41		return r;
42
43	dst->src = dssdev;
44	dssdev->dst = dst;
45
46	if (ddata->ct_cp_hpd_gpio) {
47		gpiod_set_value_cansleep(ddata->ct_cp_hpd_gpio, 1);
48		/* DC-DC converter needs at max 300us to get to 90% of 5V */
49		udelay(300);
50	}
51
52	return 0;
53}
54
55static void tpd_disconnect(struct omap_dss_device *dssdev,
56		struct omap_dss_device *dst)
57{
58	struct panel_drv_data *ddata = to_panel_data(dssdev);
59	struct omap_dss_device *in = ddata->in;
60
61	WARN_ON(dst != dssdev->dst);
62
63	if (dst != dssdev->dst)
64		return;
65
66	gpiod_set_value_cansleep(ddata->ct_cp_hpd_gpio, 0);
67
68	dst->src = NULL;
69	dssdev->dst = NULL;
70
71	in->ops.hdmi->disconnect(in, &ddata->dssdev);
72}
73
74static int tpd_enable(struct omap_dss_device *dssdev)
75{
76	struct panel_drv_data *ddata = to_panel_data(dssdev);
77	struct omap_dss_device *in = ddata->in;
78	int r;
79
80	if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE)
81		return 0;
82
83	in->ops.hdmi->set_timings(in, &ddata->timings);
84
85	r = in->ops.hdmi->enable(in);
86	if (r)
87		return r;
88
89	dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
90
91	return r;
92}
93
94static void tpd_disable(struct omap_dss_device *dssdev)
95{
96	struct panel_drv_data *ddata = to_panel_data(dssdev);
97	struct omap_dss_device *in = ddata->in;
98
99	if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)
100		return;
101
102	in->ops.hdmi->disable(in);
103
104	dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
105}
106
107static void tpd_set_timings(struct omap_dss_device *dssdev,
108		struct omap_video_timings *timings)
109{
110	struct panel_drv_data *ddata = to_panel_data(dssdev);
111	struct omap_dss_device *in = ddata->in;
112
113	ddata->timings = *timings;
114	dssdev->panel.timings = *timings;
115
116	in->ops.hdmi->set_timings(in, timings);
117}
118
119static void tpd_get_timings(struct omap_dss_device *dssdev,
120		struct omap_video_timings *timings)
121{
122	struct panel_drv_data *ddata = to_panel_data(dssdev);
123
124	*timings = ddata->timings;
125}
126
127static int tpd_check_timings(struct omap_dss_device *dssdev,
128		struct omap_video_timings *timings)
129{
130	struct panel_drv_data *ddata = to_panel_data(dssdev);
131	struct omap_dss_device *in = ddata->in;
132	int r;
133
134	r = in->ops.hdmi->check_timings(in, timings);
135
136	return r;
137}
138
139static int tpd_read_edid(struct omap_dss_device *dssdev,
140		u8 *edid, int len)
141{
142	struct panel_drv_data *ddata = to_panel_data(dssdev);
143	struct omap_dss_device *in = ddata->in;
144	int r;
145
146	if (!gpiod_get_value_cansleep(ddata->hpd_gpio))
147		return -ENODEV;
148
149	gpiod_set_value_cansleep(ddata->ls_oe_gpio, 1);
150
151	r = in->ops.hdmi->read_edid(in, edid, len);
152
153	gpiod_set_value_cansleep(ddata->ls_oe_gpio, 0);
154
155	return r;
156}
157
158static bool tpd_detect(struct omap_dss_device *dssdev)
159{
160	struct panel_drv_data *ddata = to_panel_data(dssdev);
161
162	return gpiod_get_value_cansleep(ddata->hpd_gpio);
163}
164
165static int tpd_set_infoframe(struct omap_dss_device *dssdev,
166		const struct hdmi_avi_infoframe *avi)
167{
168	struct panel_drv_data *ddata = to_panel_data(dssdev);
169	struct omap_dss_device *in = ddata->in;
170
171	return in->ops.hdmi->set_infoframe(in, avi);
172}
173
174static int tpd_set_hdmi_mode(struct omap_dss_device *dssdev,
175		bool hdmi_mode)
176{
177	struct panel_drv_data *ddata = to_panel_data(dssdev);
178	struct omap_dss_device *in = ddata->in;
179
180	return in->ops.hdmi->set_hdmi_mode(in, hdmi_mode);
181}
182
183static const struct omapdss_hdmi_ops tpd_hdmi_ops = {
184	.connect		= tpd_connect,
185	.disconnect		= tpd_disconnect,
186
187	.enable			= tpd_enable,
188	.disable		= tpd_disable,
189
190	.check_timings		= tpd_check_timings,
191	.set_timings		= tpd_set_timings,
192	.get_timings		= tpd_get_timings,
193
194	.read_edid		= tpd_read_edid,
195	.detect			= tpd_detect,
196	.set_infoframe		= tpd_set_infoframe,
197	.set_hdmi_mode		= tpd_set_hdmi_mode,
198};
199
200static int tpd_probe_of(struct platform_device *pdev)
201{
202	struct panel_drv_data *ddata = platform_get_drvdata(pdev);
203	struct device_node *node = pdev->dev.of_node;
204	struct omap_dss_device *in;
205
206	in = omapdss_of_find_source_for_first_ep(node);
207	if (IS_ERR(in)) {
208		dev_err(&pdev->dev, "failed to find video source\n");
209		return PTR_ERR(in);
210	}
211
212	ddata->in = in;
213
214	return 0;
215}
216
217static int tpd_probe(struct platform_device *pdev)
218{
219	struct omap_dss_device *dssdev;
220	struct panel_drv_data *ddata;
221	int r;
222	struct gpio_desc *gpio;
223
224	ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
225	if (!ddata)
226		return -ENOMEM;
227
228	platform_set_drvdata(pdev, ddata);
229
230	if (pdev->dev.of_node) {
231		r = tpd_probe_of(pdev);
232		if (r)
233			return r;
234	} else {
235		return -ENODEV;
236	}
237
238	gpio = devm_gpiod_get_index_optional(&pdev->dev, NULL, 0,
239		GPIOD_OUT_LOW);
240	if (IS_ERR(gpio)) {
241		r = PTR_ERR(gpio);
242		goto err_gpio;
243	}
244
245	ddata->ct_cp_hpd_gpio = gpio;
246
247	gpio = devm_gpiod_get_index_optional(&pdev->dev, NULL, 1,
248		GPIOD_OUT_LOW);
249	if (IS_ERR(gpio)) {
250		r = PTR_ERR(gpio);
251		goto err_gpio;
252	}
253
254	ddata->ls_oe_gpio = gpio;
255
256	gpio = devm_gpiod_get_index(&pdev->dev, NULL, 2,
257		GPIOD_IN);
258	if (IS_ERR(gpio)) {
259		r = PTR_ERR(gpio);
260		goto err_gpio;
261	}
262
263	ddata->hpd_gpio = gpio;
264
265	dssdev = &ddata->dssdev;
266	dssdev->ops.hdmi = &tpd_hdmi_ops;
267	dssdev->dev = &pdev->dev;
268	dssdev->type = OMAP_DISPLAY_TYPE_HDMI;
269	dssdev->output_type = OMAP_DISPLAY_TYPE_HDMI;
270	dssdev->owner = THIS_MODULE;
271	dssdev->port_num = 1;
272
273	r = omapdss_register_output(dssdev);
274	if (r) {
275		dev_err(&pdev->dev, "Failed to register output\n");
276		goto err_reg;
277	}
278
279	return 0;
280err_reg:
281err_gpio:
282	omap_dss_put_device(ddata->in);
283	return r;
284}
285
286static void tpd_remove(struct platform_device *pdev)
287{
288	struct panel_drv_data *ddata = platform_get_drvdata(pdev);
289	struct omap_dss_device *dssdev = &ddata->dssdev;
290	struct omap_dss_device *in = ddata->in;
291
292	omapdss_unregister_output(&ddata->dssdev);
293
294	WARN_ON(omapdss_device_is_enabled(dssdev));
295	if (omapdss_device_is_enabled(dssdev))
296		tpd_disable(dssdev);
297
298	WARN_ON(omapdss_device_is_connected(dssdev));
299	if (omapdss_device_is_connected(dssdev))
300		tpd_disconnect(dssdev, dssdev->dst);
301
302	omap_dss_put_device(in);
303}
304
305static const struct of_device_id tpd_of_match[] = {
306	{ .compatible = "omapdss,ti,tpd12s015", },
307	{},
308};
309
310MODULE_DEVICE_TABLE(of, tpd_of_match);
311
312static struct platform_driver tpd_driver = {
313	.probe	= tpd_probe,
314	.remove_new = tpd_remove,
315	.driver	= {
316		.name	= "tpd12s015",
317		.of_match_table = tpd_of_match,
318	},
319};
320
321module_platform_driver(tpd_driver);
322
323MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
324MODULE_DESCRIPTION("TPD12S015 driver");
325MODULE_LICENSE("GPL");
326