These changes are the raw update to linux-4.4.6-rt14. Kernel sources
[kvmfornfv.git] / kernel / drivers / video / fbdev / omap2 / displays-new / encoder-opa362.c
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.h>
18 #include <linux/module.h>
19 #include <linux/platform_device.h>
20 #include <linux/slab.h>
21 #include <linux/of_gpio.h>
22
23 #include <video/omapdss.h>
24
25 struct panel_drv_data {
26         struct omap_dss_device dssdev;
27         struct omap_dss_device *in;
28
29         struct gpio_desc *enable_gpio;
30
31         struct omap_video_timings timings;
32 };
33
34 #define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)
35
36 static int opa362_connect(struct omap_dss_device *dssdev,
37                 struct omap_dss_device *dst)
38 {
39         struct panel_drv_data *ddata = to_panel_data(dssdev);
40         struct omap_dss_device *in = ddata->in;
41         int r;
42
43         dev_dbg(dssdev->dev, "connect\n");
44
45         if (omapdss_device_is_connected(dssdev))
46                 return -EBUSY;
47
48         r = in->ops.atv->connect(in, dssdev);
49         if (r)
50                 return r;
51
52         dst->src = dssdev;
53         dssdev->dst = dst;
54
55         return 0;
56 }
57
58 static void opa362_disconnect(struct omap_dss_device *dssdev,
59                 struct omap_dss_device *dst)
60 {
61         struct panel_drv_data *ddata = to_panel_data(dssdev);
62         struct omap_dss_device *in = ddata->in;
63
64         dev_dbg(dssdev->dev, "disconnect\n");
65
66         WARN_ON(!omapdss_device_is_connected(dssdev));
67         if (!omapdss_device_is_connected(dssdev))
68                 return;
69
70         WARN_ON(dst != dssdev->dst);
71         if (dst != dssdev->dst)
72                 return;
73
74         dst->src = NULL;
75         dssdev->dst = NULL;
76
77         in->ops.atv->disconnect(in, &ddata->dssdev);
78 }
79
80 static int opa362_enable(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         int r;
85
86         dev_dbg(dssdev->dev, "enable\n");
87
88         if (!omapdss_device_is_connected(dssdev))
89                 return -ENODEV;
90
91         if (omapdss_device_is_enabled(dssdev))
92                 return 0;
93
94         in->ops.atv->set_timings(in, &ddata->timings);
95
96         r = in->ops.atv->enable(in);
97         if (r)
98                 return r;
99
100         if (ddata->enable_gpio)
101                 gpiod_set_value_cansleep(ddata->enable_gpio, 1);
102
103         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
104
105         return 0;
106 }
107
108 static void opa362_disable(struct omap_dss_device *dssdev)
109 {
110         struct panel_drv_data *ddata = to_panel_data(dssdev);
111         struct omap_dss_device *in = ddata->in;
112
113         dev_dbg(dssdev->dev, "disable\n");
114
115         if (!omapdss_device_is_enabled(dssdev))
116                 return;
117
118         if (ddata->enable_gpio)
119                 gpiod_set_value_cansleep(ddata->enable_gpio, 0);
120
121         in->ops.atv->disable(in);
122
123         dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
124 }
125
126 static void opa362_set_timings(struct omap_dss_device *dssdev,
127                 struct omap_video_timings *timings)
128 {
129         struct panel_drv_data *ddata = to_panel_data(dssdev);
130         struct omap_dss_device *in = ddata->in;
131
132         dev_dbg(dssdev->dev, "set_timings\n");
133
134         ddata->timings = *timings;
135         dssdev->panel.timings = *timings;
136
137         in->ops.atv->set_timings(in, timings);
138 }
139
140 static void opa362_get_timings(struct omap_dss_device *dssdev,
141                 struct omap_video_timings *timings)
142 {
143         struct panel_drv_data *ddata = to_panel_data(dssdev);
144
145         dev_dbg(dssdev->dev, "get_timings\n");
146
147         *timings = ddata->timings;
148 }
149
150 static int opa362_check_timings(struct omap_dss_device *dssdev,
151                 struct omap_video_timings *timings)
152 {
153         struct panel_drv_data *ddata = to_panel_data(dssdev);
154         struct omap_dss_device *in = ddata->in;
155
156         dev_dbg(dssdev->dev, "check_timings\n");
157
158         return in->ops.atv->check_timings(in, timings);
159 }
160
161 static void opa362_set_type(struct omap_dss_device *dssdev,
162                 enum omap_dss_venc_type type)
163 {
164         /* we can only drive a COMPOSITE output */
165         WARN_ON(type != OMAP_DSS_VENC_TYPE_COMPOSITE);
166
167 }
168
169 static const struct omapdss_atv_ops opa362_atv_ops = {
170         .connect        = opa362_connect,
171         .disconnect     = opa362_disconnect,
172
173         .enable         = opa362_enable,
174         .disable        = opa362_disable,
175
176         .check_timings  = opa362_check_timings,
177         .set_timings    = opa362_set_timings,
178         .get_timings    = opa362_get_timings,
179
180         .set_type       = opa362_set_type,
181 };
182
183 static int opa362_probe(struct platform_device *pdev)
184 {
185         struct device_node *node = pdev->dev.of_node;
186         struct panel_drv_data *ddata;
187         struct omap_dss_device *dssdev, *in;
188         struct gpio_desc *gpio;
189         int r;
190
191         dev_dbg(&pdev->dev, "probe\n");
192
193         if (node == NULL) {
194                 dev_err(&pdev->dev, "Unable to find device tree\n");
195                 return -EINVAL;
196         }
197
198         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
199         if (!ddata)
200                 return -ENOMEM;
201
202         platform_set_drvdata(pdev, ddata);
203
204         gpio = devm_gpiod_get_optional(&pdev->dev, "enable", GPIOD_OUT_LOW);
205         if (IS_ERR(gpio))
206                 return PTR_ERR(gpio);
207
208         ddata->enable_gpio = gpio;
209
210         in = omapdss_of_find_source_for_first_ep(node);
211         if (IS_ERR(in)) {
212                 dev_err(&pdev->dev, "failed to find video source\n");
213                 return PTR_ERR(in);
214         }
215
216         ddata->in = in;
217
218         dssdev = &ddata->dssdev;
219         dssdev->ops.atv = &opa362_atv_ops;
220         dssdev->dev = &pdev->dev;
221         dssdev->type = OMAP_DISPLAY_TYPE_VENC;
222         dssdev->output_type = OMAP_DISPLAY_TYPE_VENC;
223         dssdev->owner = THIS_MODULE;
224
225         r = omapdss_register_output(dssdev);
226         if (r) {
227                 dev_err(&pdev->dev, "Failed to register output\n");
228                 goto err_reg;
229         }
230
231         return 0;
232 err_reg:
233         omap_dss_put_device(ddata->in);
234         return r;
235 }
236
237 static int __exit opa362_remove(struct platform_device *pdev)
238 {
239         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
240         struct omap_dss_device *dssdev = &ddata->dssdev;
241         struct omap_dss_device *in = ddata->in;
242
243         omapdss_unregister_output(&ddata->dssdev);
244
245         WARN_ON(omapdss_device_is_enabled(dssdev));
246         if (omapdss_device_is_enabled(dssdev))
247                 opa362_disable(dssdev);
248
249         WARN_ON(omapdss_device_is_connected(dssdev));
250         if (omapdss_device_is_connected(dssdev))
251                 opa362_disconnect(dssdev, dssdev->dst);
252
253         omap_dss_put_device(in);
254
255         return 0;
256 }
257
258 static const struct of_device_id opa362_of_match[] = {
259         { .compatible = "omapdss,ti,opa362", },
260         {},
261 };
262 MODULE_DEVICE_TABLE(of, opa362_of_match);
263
264 static struct platform_driver opa362_driver = {
265         .probe  = opa362_probe,
266         .remove = __exit_p(opa362_remove),
267         .driver = {
268                 .name   = "amplifier-opa362",
269                 .of_match_table = opa362_of_match,
270                 .suppress_bind_attrs = true,
271         },
272 };
273
274 module_platform_driver(opa362_driver);
275
276 MODULE_AUTHOR("H. Nikolaus Schaller <hns@goldelico.com>");
277 MODULE_DESCRIPTION("OPA362 analog video amplifier with output/power control");
278 MODULE_LICENSE("GPL v2");