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.h>
10#include <linux/module.h>
11#include <linux/platform_device.h>
12#include <linux/slab.h>
13#include <linux/of.h>
14#include <linux/of_gpio.h>
15
16#include <video/omapfb_dss.h>
17#include <video/omap-panel-data.h>
18#include <video/of_display_timing.h>
19
20struct panel_drv_data {
21	struct omap_dss_device dssdev;
22	struct omap_dss_device *in;
23
24	int data_lines;
25
26	struct omap_video_timings videomode;
27
28	/* used for non-DT boot, to be removed */
29	int backlight_gpio;
30
31	struct gpio_desc *enable_gpio;
32};
33
34#define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
35
36static int panel_dpi_connect(struct omap_dss_device *dssdev)
37{
38	struct panel_drv_data *ddata = to_panel_data(dssdev);
39	struct omap_dss_device *in = ddata->in;
40	int r;
41
42	if (omapdss_device_is_connected(dssdev))
43		return 0;
44
45	r = in->ops.dpi->connect(in, dssdev);
46	if (r)
47		return r;
48
49	return 0;
50}
51
52static void panel_dpi_disconnect(struct omap_dss_device *dssdev)
53{
54	struct panel_drv_data *ddata = to_panel_data(dssdev);
55	struct omap_dss_device *in = ddata->in;
56
57	if (!omapdss_device_is_connected(dssdev))
58		return;
59
60	in->ops.dpi->disconnect(in, dssdev);
61}
62
63static int panel_dpi_enable(struct omap_dss_device *dssdev)
64{
65	struct panel_drv_data *ddata = to_panel_data(dssdev);
66	struct omap_dss_device *in = ddata->in;
67	int r;
68
69	if (!omapdss_device_is_connected(dssdev))
70		return -ENODEV;
71
72	if (omapdss_device_is_enabled(dssdev))
73		return 0;
74
75	if (ddata->data_lines)
76		in->ops.dpi->set_data_lines(in, ddata->data_lines);
77	in->ops.dpi->set_timings(in, &ddata->videomode);
78
79	r = in->ops.dpi->enable(in);
80	if (r)
81		return r;
82
83	gpiod_set_value_cansleep(ddata->enable_gpio, 1);
84
85	if (gpio_is_valid(ddata->backlight_gpio))
86		gpio_set_value_cansleep(ddata->backlight_gpio, 1);
87
88	dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
89
90	return 0;
91}
92
93static void panel_dpi_disable(struct omap_dss_device *dssdev)
94{
95	struct panel_drv_data *ddata = to_panel_data(dssdev);
96	struct omap_dss_device *in = ddata->in;
97
98	if (!omapdss_device_is_enabled(dssdev))
99		return;
100
101	if (gpio_is_valid(ddata->backlight_gpio))
102		gpio_set_value_cansleep(ddata->backlight_gpio, 0);
103
104	gpiod_set_value_cansleep(ddata->enable_gpio, 0);
105
106	in->ops.dpi->disable(in);
107
108	dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
109}
110
111static void panel_dpi_set_timings(struct omap_dss_device *dssdev,
112		struct omap_video_timings *timings)
113{
114	struct panel_drv_data *ddata = to_panel_data(dssdev);
115	struct omap_dss_device *in = ddata->in;
116
117	ddata->videomode = *timings;
118	dssdev->panel.timings = *timings;
119
120	in->ops.dpi->set_timings(in, timings);
121}
122
123static void panel_dpi_get_timings(struct omap_dss_device *dssdev,
124		struct omap_video_timings *timings)
125{
126	struct panel_drv_data *ddata = to_panel_data(dssdev);
127
128	*timings = ddata->videomode;
129}
130
131static int panel_dpi_check_timings(struct omap_dss_device *dssdev,
132		struct omap_video_timings *timings)
133{
134	struct panel_drv_data *ddata = to_panel_data(dssdev);
135	struct omap_dss_device *in = ddata->in;
136
137	return in->ops.dpi->check_timings(in, timings);
138}
139
140static struct omap_dss_driver panel_dpi_ops = {
141	.connect	= panel_dpi_connect,
142	.disconnect	= panel_dpi_disconnect,
143
144	.enable		= panel_dpi_enable,
145	.disable	= panel_dpi_disable,
146
147	.set_timings	= panel_dpi_set_timings,
148	.get_timings	= panel_dpi_get_timings,
149	.check_timings	= panel_dpi_check_timings,
150
151	.get_resolution	= omapdss_default_get_resolution,
152};
153
154static int panel_dpi_probe_pdata(struct platform_device *pdev)
155{
156	const struct panel_dpi_platform_data *pdata;
157	struct panel_drv_data *ddata = platform_get_drvdata(pdev);
158	struct omap_dss_device *dssdev, *in;
159	struct videomode vm;
160	int r;
161
162	pdata = dev_get_platdata(&pdev->dev);
163
164	in = omap_dss_find_output(pdata->source);
165	if (in == NULL) {
166		dev_err(&pdev->dev, "failed to find video source '%s'\n",
167				pdata->source);
168		return -EPROBE_DEFER;
169	}
170
171	ddata->in = in;
172
173	ddata->data_lines = pdata->data_lines;
174
175	videomode_from_timing(pdata->display_timing, &vm);
176	videomode_to_omap_video_timings(&vm, &ddata->videomode);
177
178	dssdev = &ddata->dssdev;
179	dssdev->name = pdata->name;
180
181	r = devm_gpio_request_one(&pdev->dev, pdata->enable_gpio,
182					GPIOF_OUT_INIT_LOW, "panel enable");
183	if (r)
184		goto err_gpio;
185
186	ddata->enable_gpio = gpio_to_desc(pdata->enable_gpio);
187
188	ddata->backlight_gpio = pdata->backlight_gpio;
189
190	return 0;
191
192err_gpio:
193	omap_dss_put_device(ddata->in);
194	return r;
195}
196
197static int panel_dpi_probe_of(struct platform_device *pdev)
198{
199	struct panel_drv_data *ddata = platform_get_drvdata(pdev);
200	struct device_node *node = pdev->dev.of_node;
201	struct omap_dss_device *in;
202	int r;
203	struct display_timing timing;
204	struct videomode vm;
205	struct gpio_desc *gpio;
206
207	gpio = devm_gpiod_get_optional(&pdev->dev, "enable", GPIOD_OUT_LOW);
208	if (IS_ERR(gpio))
209		return PTR_ERR(gpio);
210
211	ddata->enable_gpio = gpio;
212
213	ddata->backlight_gpio = -ENOENT;
214
215	r = of_get_display_timing(node, "panel-timing", &timing);
216	if (r) {
217		dev_err(&pdev->dev, "failed to get video timing\n");
218		return r;
219	}
220
221	videomode_from_timing(&timing, &vm);
222	videomode_to_omap_video_timings(&vm, &ddata->videomode);
223
224	in = omapdss_of_find_source_for_first_ep(node);
225	if (IS_ERR(in)) {
226		dev_err(&pdev->dev, "failed to find video source\n");
227		return PTR_ERR(in);
228	}
229
230	ddata->in = in;
231
232	return 0;
233}
234
235static int panel_dpi_probe(struct platform_device *pdev)
236{
237	struct panel_drv_data *ddata;
238	struct omap_dss_device *dssdev;
239	int r;
240
241	ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
242	if (ddata == NULL)
243		return -ENOMEM;
244
245	platform_set_drvdata(pdev, ddata);
246
247	if (dev_get_platdata(&pdev->dev)) {
248		r = panel_dpi_probe_pdata(pdev);
249		if (r)
250			return r;
251	} else if (pdev->dev.of_node) {
252		r = panel_dpi_probe_of(pdev);
253		if (r)
254			return r;
255	} else {
256		return -ENODEV;
257	}
258
259	if (gpio_is_valid(ddata->backlight_gpio)) {
260		r = devm_gpio_request_one(&pdev->dev, ddata->backlight_gpio,
261				GPIOF_OUT_INIT_LOW, "panel backlight");
262		if (r)
263			goto err_gpio;
264	}
265
266	dssdev = &ddata->dssdev;
267	dssdev->dev = &pdev->dev;
268	dssdev->driver = &panel_dpi_ops;
269	dssdev->type = OMAP_DISPLAY_TYPE_DPI;
270	dssdev->owner = THIS_MODULE;
271	dssdev->panel.timings = ddata->videomode;
272	dssdev->phy.dpi.data_lines = ddata->data_lines;
273
274	r = omapdss_register_display(dssdev);
275	if (r) {
276		dev_err(&pdev->dev, "Failed to register panel\n");
277		goto err_reg;
278	}
279
280	return 0;
281
282err_reg:
283err_gpio:
284	omap_dss_put_device(ddata->in);
285	return r;
286}
287
288static int __exit panel_dpi_remove(struct platform_device *pdev)
289{
290	struct panel_drv_data *ddata = platform_get_drvdata(pdev);
291	struct omap_dss_device *dssdev = &ddata->dssdev;
292	struct omap_dss_device *in = ddata->in;
293
294	omapdss_unregister_display(dssdev);
295
296	panel_dpi_disable(dssdev);
297	panel_dpi_disconnect(dssdev);
298
299	omap_dss_put_device(in);
300
301	return 0;
302}
303
304static const struct of_device_id panel_dpi_of_match[] = {
305	{ .compatible = "omapdss,panel-dpi", },
306	{},
307};
308
309MODULE_DEVICE_TABLE(of, panel_dpi_of_match);
310
311static struct platform_driver panel_dpi_driver = {
312	.probe = panel_dpi_probe,
313	.remove = __exit_p(panel_dpi_remove),
314	.driver = {
315		.name = "panel-dpi",
316		.of_match_table = panel_dpi_of_match,
317		.suppress_bind_attrs = true,
318	},
319};
320
321module_platform_driver(panel_dpi_driver);
322
323MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
324MODULE_DESCRIPTION("Generic MIPI DPI Panel Driver");
325MODULE_LICENSE("GPL");
326