1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * TFP410 DPI-to-DVI encoder driver
4 *
5 * Copyright (C) 2013 Texas Instruments
6 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
7 */
8
9#include <linux/gpio.h>
10#include <linux/module.h>
11#include <linux/platform_device.h>
12#include <linux/slab.h>
13#include <linux/of_gpio.h>
14
15#include <video/omapfb_dss.h>
16
17struct panel_drv_data {
18	struct omap_dss_device dssdev;
19	struct omap_dss_device *in;
20
21	int pd_gpio;
22	int data_lines;
23
24	struct omap_video_timings timings;
25};
26
27#define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)
28
29static int tfp410_connect(struct omap_dss_device *dssdev,
30		struct omap_dss_device *dst)
31{
32	struct panel_drv_data *ddata = to_panel_data(dssdev);
33	struct omap_dss_device *in = ddata->in;
34	int r;
35
36	if (omapdss_device_is_connected(dssdev))
37		return -EBUSY;
38
39	r = in->ops.dpi->connect(in, dssdev);
40	if (r)
41		return r;
42
43	dst->src = dssdev;
44	dssdev->dst = dst;
45
46	return 0;
47}
48
49static void tfp410_disconnect(struct omap_dss_device *dssdev,
50		struct omap_dss_device *dst)
51{
52	struct panel_drv_data *ddata = to_panel_data(dssdev);
53	struct omap_dss_device *in = ddata->in;
54
55	WARN_ON(!omapdss_device_is_connected(dssdev));
56	if (!omapdss_device_is_connected(dssdev))
57		return;
58
59	WARN_ON(dst != dssdev->dst);
60	if (dst != dssdev->dst)
61		return;
62
63	dst->src = NULL;
64	dssdev->dst = NULL;
65
66	in->ops.dpi->disconnect(in, &ddata->dssdev);
67}
68
69static int tfp410_enable(struct omap_dss_device *dssdev)
70{
71	struct panel_drv_data *ddata = to_panel_data(dssdev);
72	struct omap_dss_device *in = ddata->in;
73	int r;
74
75	if (!omapdss_device_is_connected(dssdev))
76		return -ENODEV;
77
78	if (omapdss_device_is_enabled(dssdev))
79		return 0;
80
81	in->ops.dpi->set_timings(in, &ddata->timings);
82	if (ddata->data_lines)
83		in->ops.dpi->set_data_lines(in, ddata->data_lines);
84
85	r = in->ops.dpi->enable(in);
86	if (r)
87		return r;
88
89	if (gpio_is_valid(ddata->pd_gpio))
90		gpio_set_value_cansleep(ddata->pd_gpio, 1);
91
92	dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
93
94	return 0;
95}
96
97static void tfp410_disable(struct omap_dss_device *dssdev)
98{
99	struct panel_drv_data *ddata = to_panel_data(dssdev);
100	struct omap_dss_device *in = ddata->in;
101
102	if (!omapdss_device_is_enabled(dssdev))
103		return;
104
105	if (gpio_is_valid(ddata->pd_gpio))
106		gpio_set_value_cansleep(ddata->pd_gpio, 0);
107
108	in->ops.dpi->disable(in);
109
110	dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
111}
112
113static void tfp410_fix_timings(struct omap_video_timings *timings)
114{
115	timings->data_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE;
116	timings->sync_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE;
117	timings->de_level = OMAPDSS_SIG_ACTIVE_HIGH;
118}
119
120static void tfp410_set_timings(struct omap_dss_device *dssdev,
121		struct omap_video_timings *timings)
122{
123	struct panel_drv_data *ddata = to_panel_data(dssdev);
124	struct omap_dss_device *in = ddata->in;
125
126	tfp410_fix_timings(timings);
127
128	ddata->timings = *timings;
129	dssdev->panel.timings = *timings;
130
131	in->ops.dpi->set_timings(in, timings);
132}
133
134static void tfp410_get_timings(struct omap_dss_device *dssdev,
135		struct omap_video_timings *timings)
136{
137	struct panel_drv_data *ddata = to_panel_data(dssdev);
138
139	*timings = ddata->timings;
140}
141
142static int tfp410_check_timings(struct omap_dss_device *dssdev,
143		struct omap_video_timings *timings)
144{
145	struct panel_drv_data *ddata = to_panel_data(dssdev);
146	struct omap_dss_device *in = ddata->in;
147
148	tfp410_fix_timings(timings);
149
150	return in->ops.dpi->check_timings(in, timings);
151}
152
153static const struct omapdss_dvi_ops tfp410_dvi_ops = {
154	.connect	= tfp410_connect,
155	.disconnect	= tfp410_disconnect,
156
157	.enable		= tfp410_enable,
158	.disable	= tfp410_disable,
159
160	.check_timings	= tfp410_check_timings,
161	.set_timings	= tfp410_set_timings,
162	.get_timings	= tfp410_get_timings,
163};
164
165static int tfp410_probe_of(struct platform_device *pdev)
166{
167	struct panel_drv_data *ddata = platform_get_drvdata(pdev);
168	struct device_node *node = pdev->dev.of_node;
169	struct omap_dss_device *in;
170	int gpio;
171
172	gpio = of_get_named_gpio(node, "powerdown-gpios", 0);
173
174	if (gpio_is_valid(gpio) || gpio == -ENOENT) {
175		ddata->pd_gpio = gpio;
176	} else {
177		dev_err(&pdev->dev, "failed to parse PD gpio\n");
178		return gpio;
179	}
180
181	in = omapdss_of_find_source_for_first_ep(node);
182	if (IS_ERR(in)) {
183		dev_err(&pdev->dev, "failed to find video source\n");
184		return PTR_ERR(in);
185	}
186
187	ddata->in = in;
188
189	return 0;
190}
191
192static int tfp410_probe(struct platform_device *pdev)
193{
194	struct panel_drv_data *ddata;
195	struct omap_dss_device *dssdev;
196	int r;
197
198	if (!pdev->dev.of_node)
199		return -ENODEV;
200
201	ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
202	if (!ddata)
203		return -ENOMEM;
204
205	platform_set_drvdata(pdev, ddata);
206
207	r = tfp410_probe_of(pdev);
208	if (r)
209		return r;
210
211	if (gpio_is_valid(ddata->pd_gpio)) {
212		r = devm_gpio_request_one(&pdev->dev, ddata->pd_gpio,
213				GPIOF_OUT_INIT_LOW, "tfp410 PD");
214		if (r) {
215			dev_err(&pdev->dev, "Failed to request PD GPIO %d\n",
216					ddata->pd_gpio);
217			goto err_gpio;
218		}
219	}
220
221	dssdev = &ddata->dssdev;
222	dssdev->ops.dvi = &tfp410_dvi_ops;
223	dssdev->dev = &pdev->dev;
224	dssdev->type = OMAP_DISPLAY_TYPE_DPI;
225	dssdev->output_type = OMAP_DISPLAY_TYPE_DVI;
226	dssdev->owner = THIS_MODULE;
227	dssdev->phy.dpi.data_lines = ddata->data_lines;
228	dssdev->port_num = 1;
229
230	r = omapdss_register_output(dssdev);
231	if (r) {
232		dev_err(&pdev->dev, "Failed to register output\n");
233		goto err_reg;
234	}
235
236	return 0;
237err_reg:
238err_gpio:
239	omap_dss_put_device(ddata->in);
240	return r;
241}
242
243static int __exit tfp410_remove(struct platform_device *pdev)
244{
245	struct panel_drv_data *ddata = platform_get_drvdata(pdev);
246	struct omap_dss_device *dssdev = &ddata->dssdev;
247	struct omap_dss_device *in = ddata->in;
248
249	omapdss_unregister_output(&ddata->dssdev);
250
251	WARN_ON(omapdss_device_is_enabled(dssdev));
252	if (omapdss_device_is_enabled(dssdev))
253		tfp410_disable(dssdev);
254
255	WARN_ON(omapdss_device_is_connected(dssdev));
256	if (omapdss_device_is_connected(dssdev))
257		tfp410_disconnect(dssdev, dssdev->dst);
258
259	omap_dss_put_device(in);
260
261	return 0;
262}
263
264static const struct of_device_id tfp410_of_match[] = {
265	{ .compatible = "omapdss,ti,tfp410", },
266	{},
267};
268
269MODULE_DEVICE_TABLE(of, tfp410_of_match);
270
271static struct platform_driver tfp410_driver = {
272	.probe	= tfp410_probe,
273	.remove	= __exit_p(tfp410_remove),
274	.driver	= {
275		.name	= "tfp410",
276		.of_match_table = tfp410_of_match,
277		.suppress_bind_attrs = true,
278	},
279};
280
281module_platform_driver(tfp410_driver);
282
283MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
284MODULE_DESCRIPTION("TFP410 DPI to DVI encoder driver");
285MODULE_LICENSE("GPL");
286