1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Generic MIPI DPI Panel Driver
4 *
5 * Copyright (C) 2013 Texas Instruments
6 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
7 */
8
9#include <linux/gpio/consumer.h>
10#include <linux/module.h>
11#include <linux/platform_device.h>
12#include <linux/slab.h>
13#include <linux/of.h>
14
15#include <video/omapfb_dss.h>
16#include <video/of_display_timing.h>
17
18struct panel_drv_data {
19	struct omap_dss_device dssdev;
20	struct omap_dss_device *in;
21
22	int data_lines;
23
24	struct omap_video_timings videomode;
25
26	struct gpio_desc *enable_gpio;
27};
28
29#define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
30
31static int panel_dpi_connect(struct omap_dss_device *dssdev)
32{
33	struct panel_drv_data *ddata = to_panel_data(dssdev);
34	struct omap_dss_device *in = ddata->in;
35
36	if (omapdss_device_is_connected(dssdev))
37		return 0;
38
39	return in->ops.dpi->connect(in, dssdev);
40}
41
42static void panel_dpi_disconnect(struct omap_dss_device *dssdev)
43{
44	struct panel_drv_data *ddata = to_panel_data(dssdev);
45	struct omap_dss_device *in = ddata->in;
46
47	if (!omapdss_device_is_connected(dssdev))
48		return;
49
50	in->ops.dpi->disconnect(in, dssdev);
51}
52
53static int panel_dpi_enable(struct omap_dss_device *dssdev)
54{
55	struct panel_drv_data *ddata = to_panel_data(dssdev);
56	struct omap_dss_device *in = ddata->in;
57	int r;
58
59	if (!omapdss_device_is_connected(dssdev))
60		return -ENODEV;
61
62	if (omapdss_device_is_enabled(dssdev))
63		return 0;
64
65	if (ddata->data_lines)
66		in->ops.dpi->set_data_lines(in, ddata->data_lines);
67	in->ops.dpi->set_timings(in, &ddata->videomode);
68
69	r = in->ops.dpi->enable(in);
70	if (r)
71		return r;
72
73	gpiod_set_value_cansleep(ddata->enable_gpio, 1);
74
75	dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
76
77	return 0;
78}
79
80static void panel_dpi_disable(struct omap_dss_device *dssdev)
81{
82	struct panel_drv_data *ddata = to_panel_data(dssdev);
83	struct omap_dss_device *in = ddata->in;
84
85	if (!omapdss_device_is_enabled(dssdev))
86		return;
87
88	gpiod_set_value_cansleep(ddata->enable_gpio, 0);
89
90	in->ops.dpi->disable(in);
91
92	dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
93}
94
95static void panel_dpi_set_timings(struct omap_dss_device *dssdev,
96		struct omap_video_timings *timings)
97{
98	struct panel_drv_data *ddata = to_panel_data(dssdev);
99	struct omap_dss_device *in = ddata->in;
100
101	ddata->videomode = *timings;
102	dssdev->panel.timings = *timings;
103
104	in->ops.dpi->set_timings(in, timings);
105}
106
107static void panel_dpi_get_timings(struct omap_dss_device *dssdev,
108		struct omap_video_timings *timings)
109{
110	struct panel_drv_data *ddata = to_panel_data(dssdev);
111
112	*timings = ddata->videomode;
113}
114
115static int panel_dpi_check_timings(struct omap_dss_device *dssdev,
116		struct omap_video_timings *timings)
117{
118	struct panel_drv_data *ddata = to_panel_data(dssdev);
119	struct omap_dss_device *in = ddata->in;
120
121	return in->ops.dpi->check_timings(in, timings);
122}
123
124static struct omap_dss_driver panel_dpi_ops = {
125	.connect	= panel_dpi_connect,
126	.disconnect	= panel_dpi_disconnect,
127
128	.enable		= panel_dpi_enable,
129	.disable	= panel_dpi_disable,
130
131	.set_timings	= panel_dpi_set_timings,
132	.get_timings	= panel_dpi_get_timings,
133	.check_timings	= panel_dpi_check_timings,
134
135	.get_resolution	= omapdss_default_get_resolution,
136};
137
138static int panel_dpi_probe_of(struct platform_device *pdev)
139{
140	struct panel_drv_data *ddata = platform_get_drvdata(pdev);
141	struct device_node *node = pdev->dev.of_node;
142	struct omap_dss_device *in;
143	int r;
144	struct display_timing timing;
145	struct videomode vm;
146	struct gpio_desc *gpio;
147
148	gpio = devm_gpiod_get_optional(&pdev->dev, "enable", GPIOD_OUT_LOW);
149	if (IS_ERR(gpio))
150		return PTR_ERR(gpio);
151
152	ddata->enable_gpio = gpio;
153
154	r = of_get_display_timing(node, "panel-timing", &timing);
155	if (r) {
156		dev_err(&pdev->dev, "failed to get video timing\n");
157		return r;
158	}
159
160	videomode_from_timing(&timing, &vm);
161	videomode_to_omap_video_timings(&vm, &ddata->videomode);
162
163	in = omapdss_of_find_source_for_first_ep(node);
164	if (IS_ERR(in)) {
165		dev_err(&pdev->dev, "failed to find video source\n");
166		return PTR_ERR(in);
167	}
168
169	ddata->in = in;
170
171	return 0;
172}
173
174static int panel_dpi_probe(struct platform_device *pdev)
175{
176	struct panel_drv_data *ddata;
177	struct omap_dss_device *dssdev;
178	int r;
179
180	if (!pdev->dev.of_node)
181		return -ENODEV;
182
183	ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
184	if (ddata == NULL)
185		return -ENOMEM;
186
187	platform_set_drvdata(pdev, ddata);
188
189	r = panel_dpi_probe_of(pdev);
190	if (r)
191		return r;
192
193	dssdev = &ddata->dssdev;
194	dssdev->dev = &pdev->dev;
195	dssdev->driver = &panel_dpi_ops;
196	dssdev->type = OMAP_DISPLAY_TYPE_DPI;
197	dssdev->owner = THIS_MODULE;
198	dssdev->panel.timings = ddata->videomode;
199	dssdev->phy.dpi.data_lines = ddata->data_lines;
200
201	r = omapdss_register_display(dssdev);
202	if (r) {
203		dev_err(&pdev->dev, "Failed to register panel\n");
204		goto err_reg;
205	}
206
207	return 0;
208
209err_reg:
210	omap_dss_put_device(ddata->in);
211	return r;
212}
213
214static void panel_dpi_remove(struct platform_device *pdev)
215{
216	struct panel_drv_data *ddata = platform_get_drvdata(pdev);
217	struct omap_dss_device *dssdev = &ddata->dssdev;
218	struct omap_dss_device *in = ddata->in;
219
220	omapdss_unregister_display(dssdev);
221
222	panel_dpi_disable(dssdev);
223	panel_dpi_disconnect(dssdev);
224
225	omap_dss_put_device(in);
226}
227
228static const struct of_device_id panel_dpi_of_match[] = {
229	{ .compatible = "omapdss,panel-dpi", },
230	{},
231};
232
233MODULE_DEVICE_TABLE(of, panel_dpi_of_match);
234
235static struct platform_driver panel_dpi_driver = {
236	.probe = panel_dpi_probe,
237	.remove_new = panel_dpi_remove,
238	.driver = {
239		.name = "panel-dpi",
240		.of_match_table = panel_dpi_of_match,
241	},
242};
243
244module_platform_driver(panel_dpi_driver);
245
246MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
247MODULE_DESCRIPTION("Generic MIPI DPI Panel Driver");
248MODULE_LICENSE("GPL");
249