panel-dpi.c

  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 = 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");