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Linux/drivers/media/radio/radio-timb.c

  1 /*
  2  * radio-timb.c Timberdale FPGA Radio driver
  3  * Copyright (c) 2009 Intel Corporation
  4  *
  5  * This program is free software; you can redistribute it and/or modify
  6  * it under the terms of the GNU General Public License version 2 as
  7  * published by the Free Software Foundation.
  8  *
  9  * This program is distributed in the hope that it will be useful,
 10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 12  * GNU General Public License for more details.
 13  *
 14  * You should have received a copy of the GNU General Public License
 15  * along with this program; if not, write to the Free Software
 16  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 17  */
 18 
 19 #include <linux/io.h>
 20 #include <media/v4l2-ioctl.h>
 21 #include <media/v4l2-device.h>
 22 #include <media/v4l2-ctrls.h>
 23 #include <media/v4l2-event.h>
 24 #include <linux/platform_device.h>
 25 #include <linux/interrupt.h>
 26 #include <linux/slab.h>
 27 #include <linux/i2c.h>
 28 #include <linux/module.h>
 29 #include <media/timb_radio.h>
 30 
 31 #define DRIVER_NAME "timb-radio"
 32 
 33 struct timbradio {
 34         struct timb_radio_platform_data pdata;
 35         struct v4l2_subdev      *sd_tuner;
 36         struct v4l2_subdev      *sd_dsp;
 37         struct video_device     video_dev;
 38         struct v4l2_device      v4l2_dev;
 39         struct mutex            lock;
 40 };
 41 
 42 
 43 static int timbradio_vidioc_querycap(struct file *file, void  *priv,
 44         struct v4l2_capability *v)
 45 {
 46         strlcpy(v->driver, DRIVER_NAME, sizeof(v->driver));
 47         strlcpy(v->card, "Timberdale Radio", sizeof(v->card));
 48         snprintf(v->bus_info, sizeof(v->bus_info), "platform:"DRIVER_NAME);
 49         v->device_caps = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
 50         v->capabilities = v->device_caps | V4L2_CAP_DEVICE_CAPS;
 51         return 0;
 52 }
 53 
 54 static int timbradio_vidioc_g_tuner(struct file *file, void *priv,
 55         struct v4l2_tuner *v)
 56 {
 57         struct timbradio *tr = video_drvdata(file);
 58         return v4l2_subdev_call(tr->sd_tuner, tuner, g_tuner, v);
 59 }
 60 
 61 static int timbradio_vidioc_s_tuner(struct file *file, void *priv,
 62         const struct v4l2_tuner *v)
 63 {
 64         struct timbradio *tr = video_drvdata(file);
 65         return v4l2_subdev_call(tr->sd_tuner, tuner, s_tuner, v);
 66 }
 67 
 68 static int timbradio_vidioc_s_frequency(struct file *file, void *priv,
 69         const struct v4l2_frequency *f)
 70 {
 71         struct timbradio *tr = video_drvdata(file);
 72         return v4l2_subdev_call(tr->sd_tuner, tuner, s_frequency, f);
 73 }
 74 
 75 static int timbradio_vidioc_g_frequency(struct file *file, void *priv,
 76         struct v4l2_frequency *f)
 77 {
 78         struct timbradio *tr = video_drvdata(file);
 79         return v4l2_subdev_call(tr->sd_tuner, tuner, g_frequency, f);
 80 }
 81 
 82 static const struct v4l2_ioctl_ops timbradio_ioctl_ops = {
 83         .vidioc_querycap        = timbradio_vidioc_querycap,
 84         .vidioc_g_tuner         = timbradio_vidioc_g_tuner,
 85         .vidioc_s_tuner         = timbradio_vidioc_s_tuner,
 86         .vidioc_g_frequency     = timbradio_vidioc_g_frequency,
 87         .vidioc_s_frequency     = timbradio_vidioc_s_frequency,
 88         .vidioc_log_status      = v4l2_ctrl_log_status,
 89         .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
 90         .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
 91 };
 92 
 93 static const struct v4l2_file_operations timbradio_fops = {
 94         .owner          = THIS_MODULE,
 95         .open           = v4l2_fh_open,
 96         .release        = v4l2_fh_release,
 97         .poll           = v4l2_ctrl_poll,
 98         .unlocked_ioctl = video_ioctl2,
 99 };
100 
101 static int timbradio_probe(struct platform_device *pdev)
102 {
103         struct timb_radio_platform_data *pdata = pdev->dev.platform_data;
104         struct timbradio *tr;
105         int err;
106 
107         if (!pdata) {
108                 dev_err(&pdev->dev, "Platform data missing\n");
109                 err = -EINVAL;
110                 goto err;
111         }
112 
113         tr = devm_kzalloc(&pdev->dev, sizeof(*tr), GFP_KERNEL);
114         if (!tr) {
115                 err = -ENOMEM;
116                 goto err;
117         }
118 
119         tr->pdata = *pdata;
120         mutex_init(&tr->lock);
121 
122         strlcpy(tr->video_dev.name, "Timberdale Radio",
123                 sizeof(tr->video_dev.name));
124         tr->video_dev.fops = &timbradio_fops;
125         tr->video_dev.ioctl_ops = &timbradio_ioctl_ops;
126         tr->video_dev.release = video_device_release_empty;
127         tr->video_dev.minor = -1;
128         tr->video_dev.lock = &tr->lock;
129         set_bit(V4L2_FL_USE_FH_PRIO, &tr->video_dev.flags);
130 
131         strlcpy(tr->v4l2_dev.name, DRIVER_NAME, sizeof(tr->v4l2_dev.name));
132         err = v4l2_device_register(NULL, &tr->v4l2_dev);
133         if (err)
134                 goto err;
135 
136         tr->video_dev.v4l2_dev = &tr->v4l2_dev;
137 
138         tr->sd_tuner = v4l2_i2c_new_subdev_board(&tr->v4l2_dev,
139                 i2c_get_adapter(pdata->i2c_adapter), pdata->tuner, NULL);
140         tr->sd_dsp = v4l2_i2c_new_subdev_board(&tr->v4l2_dev,
141                 i2c_get_adapter(pdata->i2c_adapter), pdata->dsp, NULL);
142         if (tr->sd_tuner == NULL || tr->sd_dsp == NULL)
143                 goto err_video_req;
144 
145         tr->v4l2_dev.ctrl_handler = tr->sd_dsp->ctrl_handler;
146 
147         err = video_register_device(&tr->video_dev, VFL_TYPE_RADIO, -1);
148         if (err) {
149                 dev_err(&pdev->dev, "Error reg video\n");
150                 goto err_video_req;
151         }
152 
153         video_set_drvdata(&tr->video_dev, tr);
154 
155         platform_set_drvdata(pdev, tr);
156         return 0;
157 
158 err_video_req:
159         v4l2_device_unregister(&tr->v4l2_dev);
160 err:
161         dev_err(&pdev->dev, "Failed to register: %d\n", err);
162 
163         return err;
164 }
165 
166 static int timbradio_remove(struct platform_device *pdev)
167 {
168         struct timbradio *tr = platform_get_drvdata(pdev);
169 
170         video_unregister_device(&tr->video_dev);
171         v4l2_device_unregister(&tr->v4l2_dev);
172         return 0;
173 }
174 
175 static struct platform_driver timbradio_platform_driver = {
176         .driver = {
177                 .name   = DRIVER_NAME,
178                 .owner  = THIS_MODULE,
179         },
180         .probe          = timbradio_probe,
181         .remove         = timbradio_remove,
182 };
183 
184 module_platform_driver(timbradio_platform_driver);
185 
186 MODULE_DESCRIPTION("Timberdale Radio driver");
187 MODULE_AUTHOR("Mocean Laboratories <info@mocean-labs.com>");
188 MODULE_LICENSE("GPL v2");
189 MODULE_VERSION("0.0.2");
190 MODULE_ALIAS("platform:"DRIVER_NAME);
191 

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