1 /*
2 * OPA362 analog video amplifier with output/power control
3 *
4 * Copyright (C) 2014 Golden Delicious Computers
5 * Author: H. Nikolaus Schaller <hns@goldelico.com>
6 *
7 * based on encoder-tfp410
8 *
9 * Copyright (C) 2013 Texas Instruments
10 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
11 *
12 * This program is free software; you can redistribute it and/or modify it
13 * under the terms of the GNU General Public License version 2 as published by
14 * the Free Software Foundation.
15 */
16
17 #include <linux/gpio/consumer.h>
18 #include <linux/module.h>
19 #include <linux/platform_device.h>
20 #include <linux/slab.h>
21
22 #include "../dss/omapdss.h"
23
24 struct panel_drv_data {
25 struct omap_dss_device dssdev;
26 struct omap_dss_device *in;
27
28 struct gpio_desc *enable_gpio;
29
30 struct omap_video_timings timings;
31 };
32
33 #define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)
34
opa362_connect(struct omap_dss_device * dssdev,struct omap_dss_device * dst)35 static int opa362_connect(struct omap_dss_device *dssdev,
36 struct omap_dss_device *dst)
37 {
38 struct panel_drv_data *ddata = to_panel_data(dssdev);
39 struct omap_dss_device *in = ddata->in;
40 int r;
41
42 dev_dbg(dssdev->dev, "connect\n");
43
44 if (omapdss_device_is_connected(dssdev))
45 return -EBUSY;
46
47 r = in->ops.atv->connect(in, dssdev);
48 if (r)
49 return r;
50
51 dst->src = dssdev;
52 dssdev->dst = dst;
53
54 return 0;
55 }
56
opa362_disconnect(struct omap_dss_device * dssdev,struct omap_dss_device * dst)57 static void opa362_disconnect(struct omap_dss_device *dssdev,
58 struct omap_dss_device *dst)
59 {
60 struct panel_drv_data *ddata = to_panel_data(dssdev);
61 struct omap_dss_device *in = ddata->in;
62
63 dev_dbg(dssdev->dev, "disconnect\n");
64
65 WARN_ON(!omapdss_device_is_connected(dssdev));
66 if (!omapdss_device_is_connected(dssdev))
67 return;
68
69 WARN_ON(dst != dssdev->dst);
70 if (dst != dssdev->dst)
71 return;
72
73 dst->src = NULL;
74 dssdev->dst = NULL;
75
76 in->ops.atv->disconnect(in, &ddata->dssdev);
77 }
78
opa362_enable(struct omap_dss_device * dssdev)79 static int opa362_enable(struct omap_dss_device *dssdev)
80 {
81 struct panel_drv_data *ddata = to_panel_data(dssdev);
82 struct omap_dss_device *in = ddata->in;
83 int r;
84
85 dev_dbg(dssdev->dev, "enable\n");
86
87 if (!omapdss_device_is_connected(dssdev))
88 return -ENODEV;
89
90 if (omapdss_device_is_enabled(dssdev))
91 return 0;
92
93 in->ops.atv->set_timings(in, &ddata->timings);
94
95 r = in->ops.atv->enable(in);
96 if (r)
97 return r;
98
99 if (ddata->enable_gpio)
100 gpiod_set_value_cansleep(ddata->enable_gpio, 1);
101
102 dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
103
104 return 0;
105 }
106
opa362_disable(struct omap_dss_device * dssdev)107 static void opa362_disable(struct omap_dss_device *dssdev)
108 {
109 struct panel_drv_data *ddata = to_panel_data(dssdev);
110 struct omap_dss_device *in = ddata->in;
111
112 dev_dbg(dssdev->dev, "disable\n");
113
114 if (!omapdss_device_is_enabled(dssdev))
115 return;
116
117 if (ddata->enable_gpio)
118 gpiod_set_value_cansleep(ddata->enable_gpio, 0);
119
120 in->ops.atv->disable(in);
121
122 dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
123 }
124
opa362_set_timings(struct omap_dss_device * dssdev,struct omap_video_timings * timings)125 static void opa362_set_timings(struct omap_dss_device *dssdev,
126 struct omap_video_timings *timings)
127 {
128 struct panel_drv_data *ddata = to_panel_data(dssdev);
129 struct omap_dss_device *in = ddata->in;
130
131 dev_dbg(dssdev->dev, "set_timings\n");
132
133 ddata->timings = *timings;
134 dssdev->panel.timings = *timings;
135
136 in->ops.atv->set_timings(in, timings);
137 }
138
opa362_get_timings(struct omap_dss_device * dssdev,struct omap_video_timings * timings)139 static void opa362_get_timings(struct omap_dss_device *dssdev,
140 struct omap_video_timings *timings)
141 {
142 struct panel_drv_data *ddata = to_panel_data(dssdev);
143
144 dev_dbg(dssdev->dev, "get_timings\n");
145
146 *timings = ddata->timings;
147 }
148
opa362_check_timings(struct omap_dss_device * dssdev,struct omap_video_timings * timings)149 static int opa362_check_timings(struct omap_dss_device *dssdev,
150 struct omap_video_timings *timings)
151 {
152 struct panel_drv_data *ddata = to_panel_data(dssdev);
153 struct omap_dss_device *in = ddata->in;
154
155 dev_dbg(dssdev->dev, "check_timings\n");
156
157 return in->ops.atv->check_timings(in, timings);
158 }
159
opa362_set_type(struct omap_dss_device * dssdev,enum omap_dss_venc_type type)160 static void opa362_set_type(struct omap_dss_device *dssdev,
161 enum omap_dss_venc_type type)
162 {
163 /* we can only drive a COMPOSITE output */
164 WARN_ON(type != OMAP_DSS_VENC_TYPE_COMPOSITE);
165
166 }
167
168 static const struct omapdss_atv_ops opa362_atv_ops = {
169 .connect = opa362_connect,
170 .disconnect = opa362_disconnect,
171
172 .enable = opa362_enable,
173 .disable = opa362_disable,
174
175 .check_timings = opa362_check_timings,
176 .set_timings = opa362_set_timings,
177 .get_timings = opa362_get_timings,
178
179 .set_type = opa362_set_type,
180 };
181
opa362_probe(struct platform_device * pdev)182 static int opa362_probe(struct platform_device *pdev)
183 {
184 struct device_node *node = pdev->dev.of_node;
185 struct panel_drv_data *ddata;
186 struct omap_dss_device *dssdev, *in;
187 struct gpio_desc *gpio;
188 int r;
189
190 dev_dbg(&pdev->dev, "probe\n");
191
192 if (node == NULL) {
193 dev_err(&pdev->dev, "Unable to find device tree\n");
194 return -EINVAL;
195 }
196
197 ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
198 if (!ddata)
199 return -ENOMEM;
200
201 platform_set_drvdata(pdev, ddata);
202
203 gpio = devm_gpiod_get_optional(&pdev->dev, "enable", GPIOD_OUT_LOW);
204 if (IS_ERR(gpio))
205 return PTR_ERR(gpio);
206
207 ddata->enable_gpio = gpio;
208
209 in = omapdss_of_find_source_for_first_ep(node);
210 if (IS_ERR(in)) {
211 dev_err(&pdev->dev, "failed to find video source\n");
212 return PTR_ERR(in);
213 }
214
215 ddata->in = in;
216
217 dssdev = &ddata->dssdev;
218 dssdev->ops.atv = &opa362_atv_ops;
219 dssdev->dev = &pdev->dev;
220 dssdev->type = OMAP_DISPLAY_TYPE_VENC;
221 dssdev->output_type = OMAP_DISPLAY_TYPE_VENC;
222 dssdev->owner = THIS_MODULE;
223
224 r = omapdss_register_output(dssdev);
225 if (r) {
226 dev_err(&pdev->dev, "Failed to register output\n");
227 goto err_reg;
228 }
229
230 return 0;
231 err_reg:
232 omap_dss_put_device(ddata->in);
233 return r;
234 }
235
opa362_remove(struct platform_device * pdev)236 static int __exit opa362_remove(struct platform_device *pdev)
237 {
238 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
239 struct omap_dss_device *dssdev = &ddata->dssdev;
240 struct omap_dss_device *in = ddata->in;
241
242 omapdss_unregister_output(&ddata->dssdev);
243
244 WARN_ON(omapdss_device_is_enabled(dssdev));
245 if (omapdss_device_is_enabled(dssdev))
246 opa362_disable(dssdev);
247
248 WARN_ON(omapdss_device_is_connected(dssdev));
249 if (omapdss_device_is_connected(dssdev))
250 opa362_disconnect(dssdev, dssdev->dst);
251
252 omap_dss_put_device(in);
253
254 return 0;
255 }
256
257 static const struct of_device_id opa362_of_match[] = {
258 { .compatible = "omapdss,ti,opa362", },
259 {},
260 };
261 MODULE_DEVICE_TABLE(of, opa362_of_match);
262
263 static struct platform_driver opa362_driver = {
264 .probe = opa362_probe,
265 .remove = __exit_p(opa362_remove),
266 .driver = {
267 .name = "amplifier-opa362",
268 .of_match_table = opa362_of_match,
269 .suppress_bind_attrs = true,
270 },
271 };
272
273 module_platform_driver(opa362_driver);
274
275 MODULE_AUTHOR("H. Nikolaus Schaller <hns@goldelico.com>");
276 MODULE_DESCRIPTION("OPA362 analog video amplifier with output/power control");
277 MODULE_LICENSE("GPL v2");
278