tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Generic Platform Camera Driver
3 *
4 * Copyright (C) 2008 Magnus Damm
5 * Based on mt9m001 driver,
6 * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13#include <linux/init.h>
14#include <linux/module.h>
15#include <linux/slab.h>
16#include <linux/delay.h>
17#include <linux/platform_device.h>
18#include <linux/videodev2.h>
19#include <media/v4l2-subdev.h>
20#include <media/soc_camera.h>
21#include <media/soc_camera_platform.h>
22
23struct soc_camera_platform_priv {
24 struct v4l2_subdev subdev;
25};
26
27static struct soc_camera_platform_priv *get_priv(struct platform_device *pdev)
28{
29 struct v4l2_subdev *subdev = platform_get_drvdata(pdev);
30 return container_of(subdev, struct soc_camera_platform_priv, subdev);
31}
32
33static int soc_camera_platform_s_stream(struct v4l2_subdev *sd, int enable)
34{
35 struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);
36 return p->set_capture(p, enable);
37}
38
39static int soc_camera_platform_fill_fmt(struct v4l2_subdev *sd,
40 struct v4l2_mbus_framefmt *mf)
41{
42 struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);
43
44 mf->width = p->format.width;
45 mf->height = p->format.height;
46 mf->code = p->format.code;
47 mf->colorspace = p->format.colorspace;
48 mf->field = p->format.field;
49
50 return 0;
51}
52
53static struct v4l2_subdev_core_ops platform_subdev_core_ops;
54
55static int soc_camera_platform_enum_fmt(struct v4l2_subdev *sd, unsigned int index,
56 enum v4l2_mbus_pixelcode *code)
57{
58 struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);
59
60 if (index)
61 return -EINVAL;
62
63 *code = p->format.code;
64 return 0;
65}
66
67static int soc_camera_platform_g_crop(struct v4l2_subdev *sd,
68 struct v4l2_crop *a)
69{
70 struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);
71
72 a->c.left = 0;
73 a->c.top = 0;
74 a->c.width = p->format.width;
75 a->c.height = p->format.height;
76 a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
77
78 return 0;
79}
80
81static int soc_camera_platform_cropcap(struct v4l2_subdev *sd,
82 struct v4l2_cropcap *a)
83{
84 struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);
85
86 a->bounds.left = 0;
87 a->bounds.top = 0;
88 a->bounds.width = p->format.width;
89 a->bounds.height = p->format.height;
90 a->defrect = a->bounds;
91 a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
92 a->pixelaspect.numerator = 1;
93 a->pixelaspect.denominator = 1;
94
95 return 0;
96}
97
98static int soc_camera_platform_g_mbus_config(struct v4l2_subdev *sd,
99 struct v4l2_mbus_config *cfg)
100{
101 struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);
102
103 cfg->flags = p->mbus_param;
104 cfg->type = p->mbus_type;
105
106 return 0;
107}
108
109static struct v4l2_subdev_video_ops platform_subdev_video_ops = {
110 .s_stream = soc_camera_platform_s_stream,
111 .enum_mbus_fmt = soc_camera_platform_enum_fmt,
112 .cropcap = soc_camera_platform_cropcap,
113 .g_crop = soc_camera_platform_g_crop,
114 .try_mbus_fmt = soc_camera_platform_fill_fmt,
115 .g_mbus_fmt = soc_camera_platform_fill_fmt,
116 .s_mbus_fmt = soc_camera_platform_fill_fmt,
117 .g_mbus_config = soc_camera_platform_g_mbus_config,
118};
119
120static struct v4l2_subdev_ops platform_subdev_ops = {
121 .core = &platform_subdev_core_ops,
122 .video = &platform_subdev_video_ops,
123};
124
125static int soc_camera_platform_probe(struct platform_device *pdev)
126{
127 struct soc_camera_host *ici;
128 struct soc_camera_platform_priv *priv;
129 struct soc_camera_platform_info *p = pdev->dev.platform_data;
130 struct soc_camera_device *icd;
131 int ret;
132
133 if (!p)
134 return -EINVAL;
135
136 if (!p->icd) {
137 dev_err(&pdev->dev,
138 "Platform has not set soc_camera_device pointer!\n");
139 return -EINVAL;
140 }
141
142 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
143 if (!priv)
144 return -ENOMEM;
145
146 icd = p->icd;
147
148 /* soc-camera convention: control's drvdata points to the subdev */
149 platform_set_drvdata(pdev, &priv->subdev);
150 /* Set the control device reference */
151 icd->control = &pdev->dev;
152
153 ici = to_soc_camera_host(icd->parent);
154
155 v4l2_subdev_init(&priv->subdev, &platform_subdev_ops);
156 v4l2_set_subdevdata(&priv->subdev, p);
157 strncpy(priv->subdev.name, dev_name(&pdev->dev), V4L2_SUBDEV_NAME_SIZE);
158
159 ret = v4l2_device_register_subdev(&ici->v4l2_dev, &priv->subdev);
160 if (ret)
161 goto evdrs;
162
163 return ret;
164
165evdrs:
166 platform_set_drvdata(pdev, NULL);
167 kfree(priv);
168 return ret;
169}
170
171static int soc_camera_platform_remove(struct platform_device *pdev)
172{
173 struct soc_camera_platform_priv *priv = get_priv(pdev);
174 struct soc_camera_platform_info *p = v4l2_get_subdevdata(&priv->subdev);
175
176 p->icd->control = NULL;
177 v4l2_device_unregister_subdev(&priv->subdev);
178 platform_set_drvdata(pdev, NULL);
179 kfree(priv);
180 return 0;
181}
182
183static struct platform_driver soc_camera_platform_driver = {
184 .driver = {
185 .name = "soc_camera_platform",
186 .owner = THIS_MODULE,
187 },
188 .probe = soc_camera_platform_probe,
189 .remove = soc_camera_platform_remove,
190};
191
192module_platform_driver(soc_camera_platform_driver);
193
194MODULE_DESCRIPTION("SoC Camera Platform driver");
195MODULE_AUTHOR("Magnus Damm");
196MODULE_LICENSE("GPL v2");
197MODULE_ALIAS("platform:soc_camera_platform");