encoder-tfp410.c

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