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1 | /* |
2 | * vivid-radio-tx.c - radio transmitter support functions. | |
3 | * | |
4 | * Copyright 2014 Cisco Systems, Inc. and/or its affiliates. All rights reserved. | |
5 | * | |
6 | * This program is free software; you may redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; version 2 of the License. | |
9 | * | |
10 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
11 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
12 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
13 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
14 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
15 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
16 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
17 | * SOFTWARE. | |
18 | */ | |
19 | ||
20 | #include <linux/errno.h> | |
21 | #include <linux/kernel.h> | |
22 | #include <linux/delay.h> | |
23 | #include <linux/videodev2.h> | |
24 | #include <linux/v4l2-dv-timings.h> | |
25 | #include <media/v4l2-common.h> | |
26 | #include <media/v4l2-event.h> | |
27 | #include <media/v4l2-dv-timings.h> | |
28 | ||
29 | #include "vivid-core.h" | |
30 | #include "vivid-ctrls.h" | |
31 | #include "vivid-radio-common.h" | |
32 | #include "vivid-radio-tx.h" | |
33 | ||
34 | ssize_t vivid_radio_tx_write(struct file *file, const char __user *buf, | |
35 | size_t size, loff_t *offset) | |
36 | { | |
37 | struct vivid_dev *dev = video_drvdata(file); | |
38 | struct v4l2_rds_data *data = dev->rds_gen.data; | |
39 | struct timespec ts; | |
40 | unsigned blk; | |
41 | int i; | |
42 | ||
43 | if (dev->radio_tx_rds_controls) | |
44 | return -EINVAL; | |
45 | ||
46 | if (size < sizeof(*data)) | |
47 | return -EINVAL; | |
48 | size = sizeof(*data) * (size / sizeof(*data)); | |
49 | ||
50 | if (mutex_lock_interruptible(&dev->mutex)) | |
51 | return -ERESTARTSYS; | |
52 | if (dev->radio_tx_rds_owner && | |
53 | file->private_data != dev->radio_tx_rds_owner) { | |
54 | mutex_unlock(&dev->mutex); | |
55 | return -EBUSY; | |
56 | } | |
57 | dev->radio_tx_rds_owner = file->private_data; | |
58 | ||
59 | retry: | |
60 | ktime_get_ts(&ts); | |
61 | ts = timespec_sub(ts, dev->radio_rds_init_ts); | |
62 | blk = ts.tv_sec * 100 + ts.tv_nsec / 10000000; | |
63 | blk = (blk * VIVID_RDS_GEN_BLOCKS) / 500; | |
64 | if (blk - VIVID_RDS_GEN_BLOCKS >= dev->radio_tx_rds_last_block) | |
65 | dev->radio_tx_rds_last_block = blk - VIVID_RDS_GEN_BLOCKS + 1; | |
66 | ||
67 | /* | |
68 | * No data is available if there hasn't been time to get new data, | |
69 | * or if the RDS receiver has been disabled, or if we use the data | |
70 | * from the RDS transmitter and that RDS transmitter has been disabled, | |
71 | * or if the signal quality is too weak. | |
72 | */ | |
73 | if (blk == dev->radio_tx_rds_last_block || | |
74 | !(dev->radio_tx_subchans & V4L2_TUNER_SUB_RDS)) { | |
75 | mutex_unlock(&dev->mutex); | |
76 | if (file->f_flags & O_NONBLOCK) | |
77 | return -EWOULDBLOCK; | |
78 | if (msleep_interruptible(20) && signal_pending(current)) | |
79 | return -EINTR; | |
80 | if (mutex_lock_interruptible(&dev->mutex)) | |
81 | return -ERESTARTSYS; | |
82 | goto retry; | |
83 | } | |
84 | ||
85 | for (i = 0; i < size && blk > dev->radio_tx_rds_last_block; | |
86 | dev->radio_tx_rds_last_block++) { | |
87 | unsigned data_blk = dev->radio_tx_rds_last_block % VIVID_RDS_GEN_BLOCKS; | |
88 | struct v4l2_rds_data rds; | |
89 | ||
90 | if (copy_from_user(&rds, buf + i, sizeof(rds))) { | |
91 | i = -EFAULT; | |
92 | break; | |
93 | } | |
94 | i += sizeof(rds); | |
95 | if (!dev->radio_rds_loop) | |
96 | continue; | |
97 | if ((rds.block & V4L2_RDS_BLOCK_MSK) == V4L2_RDS_BLOCK_INVALID || | |
98 | (rds.block & V4L2_RDS_BLOCK_ERROR)) | |
99 | continue; | |
100 | rds.block &= V4L2_RDS_BLOCK_MSK; | |
101 | data[data_blk] = rds; | |
102 | } | |
103 | mutex_unlock(&dev->mutex); | |
104 | return i; | |
105 | } | |
106 | ||
107 | unsigned int vivid_radio_tx_poll(struct file *file, struct poll_table_struct *wait) | |
108 | { | |
109 | return POLLOUT | POLLWRNORM | v4l2_ctrl_poll(file, wait); | |
110 | } | |
111 | ||
112 | int vidioc_g_modulator(struct file *file, void *fh, struct v4l2_modulator *a) | |
113 | { | |
114 | struct vivid_dev *dev = video_drvdata(file); | |
115 | ||
116 | if (a->index > 0) | |
117 | return -EINVAL; | |
118 | ||
119 | strlcpy(a->name, "AM/FM/SW Transmitter", sizeof(a->name)); | |
120 | a->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO | | |
121 | V4L2_TUNER_CAP_FREQ_BANDS | V4L2_TUNER_CAP_RDS | | |
122 | (dev->radio_tx_rds_controls ? | |
123 | V4L2_TUNER_CAP_RDS_CONTROLS : | |
124 | V4L2_TUNER_CAP_RDS_BLOCK_IO); | |
125 | a->rangelow = AM_FREQ_RANGE_LOW; | |
126 | a->rangehigh = FM_FREQ_RANGE_HIGH; | |
127 | a->txsubchans = dev->radio_tx_subchans; | |
128 | return 0; | |
129 | } | |
130 | ||
131 | int vidioc_s_modulator(struct file *file, void *fh, const struct v4l2_modulator *a) | |
132 | { | |
133 | struct vivid_dev *dev = video_drvdata(file); | |
134 | ||
135 | if (a->index) | |
136 | return -EINVAL; | |
137 | if (a->txsubchans & ~0x13) | |
138 | return -EINVAL; | |
139 | dev->radio_tx_subchans = a->txsubchans; | |
140 | return 0; | |
141 | } |