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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-rds-gen.h"
33#include "vivid-radio-rx.h"
34
35ssize_t vivid_radio_rx_read(struct file *file, char __user *buf,
36 size_t size, loff_t *offset)
37{
38 struct vivid_dev *dev = video_drvdata(file);
39 struct timespec ts;
40 struct v4l2_rds_data *data = dev->rds_gen.data;
41 bool use_alternates;
42 unsigned blk;
43 int perc;
44 int i;
45
46 if (dev->radio_rx_rds_controls)
47 return -EINVAL;
48 if (size < sizeof(*data))
49 return 0;
50 size = sizeof(*data) * (size / sizeof(*data));
51
52 if (mutex_lock_interruptible(&dev->mutex))
53 return -ERESTARTSYS;
54 if (dev->radio_rx_rds_owner &&
55 file->private_data != dev->radio_rx_rds_owner) {
56 mutex_unlock(&dev->mutex);
57 return -EBUSY;
58 }
59 if (dev->radio_rx_rds_owner == NULL) {
60 vivid_radio_rds_init(dev);
61 dev->radio_rx_rds_owner = file->private_data;
62 }
63
64retry:
65 ktime_get_ts(&ts);
66 use_alternates = ts.tv_sec % 10 >= 5;
67 if (dev->radio_rx_rds_last_block == 0 ||
68 dev->radio_rx_rds_use_alternates != use_alternates) {
69 dev->radio_rx_rds_use_alternates = use_alternates;
70
71 vivid_radio_rds_init(dev);
72 }
73 ts = timespec_sub(ts, dev->radio_rds_init_ts);
74 blk = ts.tv_sec * 100 + ts.tv_nsec / 10000000;
75 blk = (blk * VIVID_RDS_GEN_BLOCKS) / 500;
76 if (blk >= dev->radio_rx_rds_last_block + VIVID_RDS_GEN_BLOCKS)
77 dev->radio_rx_rds_last_block = blk - VIVID_RDS_GEN_BLOCKS + 1;
78
79
80
81
82
83
84
85 if (blk == dev->radio_rx_rds_last_block || !dev->radio_rx_rds_enabled ||
86 (dev->radio_rds_loop && !(dev->radio_tx_subchans & V4L2_TUNER_SUB_RDS)) ||
87 abs(dev->radio_rx_sig_qual) > 200) {
88 mutex_unlock(&dev->mutex);
89 if (file->f_flags & O_NONBLOCK)
90 return -EWOULDBLOCK;
91 if (msleep_interruptible(20) && signal_pending(current))
92 return -EINTR;
93 if (mutex_lock_interruptible(&dev->mutex))
94 return -ERESTARTSYS;
95 goto retry;
96 }
97
98
99 perc = abs(dev->radio_rx_sig_qual) / 4;
100
101 for (i = 0; i < size && blk > dev->radio_rx_rds_last_block;
102 dev->radio_rx_rds_last_block++) {
103 unsigned data_blk = dev->radio_rx_rds_last_block % VIVID_RDS_GEN_BLOCKS;
104 struct v4l2_rds_data rds = data[data_blk];
105
106 if (data_blk == 0 && dev->radio_rds_loop)
107 vivid_radio_rds_init(dev);
108 if (perc && prandom_u32_max(100) < perc) {
109 switch (prandom_u32_max(4)) {
110 case 0:
111 rds.block |= V4L2_RDS_BLOCK_CORRECTED;
112 break;
113 case 1:
114 rds.block |= V4L2_RDS_BLOCK_INVALID;
115 break;
116 case 2:
117 rds.block |= V4L2_RDS_BLOCK_ERROR;
118 rds.lsb = prandom_u32_max(256);
119 rds.msb = prandom_u32_max(256);
120 break;
121 case 3:
122 if (i)
123 continue;
124
125
126
127
128
129 break;
130 }
131 }
132 if (copy_to_user(buf + i, &rds, sizeof(rds))) {
133 i = -EFAULT;
134 break;
135 }
136 i += sizeof(rds);
137 }
138 mutex_unlock(&dev->mutex);
139 return i;
140}
141
142unsigned int vivid_radio_rx_poll(struct file *file, struct poll_table_struct *wait)
143{
144 return POLLIN | POLLRDNORM | v4l2_ctrl_poll(file, wait);
145}
146
147int vivid_radio_rx_enum_freq_bands(struct file *file, void *fh, struct v4l2_frequency_band *band)
148{
149 if (band->tuner != 0)
150 return -EINVAL;
151
152 if (band->index >= TOT_BANDS)
153 return -EINVAL;
154
155 *band = vivid_radio_bands[band->index];
156 return 0;
157}
158
159int vivid_radio_rx_s_hw_freq_seek(struct file *file, void *fh, const struct v4l2_hw_freq_seek *a)
160{
161 struct vivid_dev *dev = video_drvdata(file);
162 unsigned low, high;
163 unsigned freq;
164 unsigned spacing;
165 unsigned band;
166
167 if (a->tuner)
168 return -EINVAL;
169 if (a->wrap_around && dev->radio_rx_hw_seek_mode == VIVID_HW_SEEK_BOUNDED)
170 return -EINVAL;
171
172 if (!a->wrap_around && dev->radio_rx_hw_seek_mode == VIVID_HW_SEEK_WRAP)
173 return -EINVAL;
174 if (!a->rangelow ^ !a->rangehigh)
175 return -EINVAL;
176
177 if (file->f_flags & O_NONBLOCK)
178 return -EWOULDBLOCK;
179
180 if (a->rangelow) {
181 for (band = 0; band < TOT_BANDS; band++)
182 if (a->rangelow >= vivid_radio_bands[band].rangelow &&
183 a->rangehigh <= vivid_radio_bands[band].rangehigh)
184 break;
185 if (band == TOT_BANDS)
186 return -EINVAL;
187 if (!dev->radio_rx_hw_seek_prog_lim &&
188 (a->rangelow != vivid_radio_bands[band].rangelow ||
189 a->rangehigh != vivid_radio_bands[band].rangehigh))
190 return -EINVAL;
191 low = a->rangelow;
192 high = a->rangehigh;
193 } else {
194 for (band = 0; band < TOT_BANDS; band++)
195 if (dev->radio_rx_freq >= vivid_radio_bands[band].rangelow &&
196 dev->radio_rx_freq <= vivid_radio_bands[band].rangehigh)
197 break;
198 if (band == TOT_BANDS)
199 return -EINVAL;
200 low = vivid_radio_bands[band].rangelow;
201 high = vivid_radio_bands[band].rangehigh;
202 }
203 spacing = band == BAND_AM ? 1600 : 16000;
204 freq = clamp(dev->radio_rx_freq, low, high);
205
206 if (a->seek_upward) {
207 freq = spacing * (freq / spacing) + spacing;
208 if (freq > high) {
209 if (!a->wrap_around)
210 return -ENODATA;
211 freq = spacing * (low / spacing) + spacing;
212 if (freq >= dev->radio_rx_freq)
213 return -ENODATA;
214 }
215 } else {
216 freq = spacing * ((freq + spacing - 1) / spacing) - spacing;
217 if (freq < low) {
218 if (!a->wrap_around)
219 return -ENODATA;
220 freq = spacing * ((high + spacing - 1) / spacing) - spacing;
221 if (freq <= dev->radio_rx_freq)
222 return -ENODATA;
223 }
224 }
225 return 0;
226}
227
228int vivid_radio_rx_g_tuner(struct file *file, void *fh, struct v4l2_tuner *vt)
229{
230 struct vivid_dev *dev = video_drvdata(file);
231 int delta = 800;
232 int sig_qual;
233
234 if (vt->index > 0)
235 return -EINVAL;
236
237 strlcpy(vt->name, "AM/FM/SW Receiver", sizeof(vt->name));
238 vt->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
239 V4L2_TUNER_CAP_FREQ_BANDS | V4L2_TUNER_CAP_RDS |
240 (dev->radio_rx_rds_controls ?
241 V4L2_TUNER_CAP_RDS_CONTROLS :
242 V4L2_TUNER_CAP_RDS_BLOCK_IO) |
243 (dev->radio_rx_hw_seek_prog_lim ?
244 V4L2_TUNER_CAP_HWSEEK_PROG_LIM : 0);
245 switch (dev->radio_rx_hw_seek_mode) {
246 case VIVID_HW_SEEK_BOUNDED:
247 vt->capability |= V4L2_TUNER_CAP_HWSEEK_BOUNDED;
248 break;
249 case VIVID_HW_SEEK_WRAP:
250 vt->capability |= V4L2_TUNER_CAP_HWSEEK_WRAP;
251 break;
252 case VIVID_HW_SEEK_BOTH:
253 vt->capability |= V4L2_TUNER_CAP_HWSEEK_WRAP |
254 V4L2_TUNER_CAP_HWSEEK_BOUNDED;
255 break;
256 }
257 vt->rangelow = AM_FREQ_RANGE_LOW;
258 vt->rangehigh = FM_FREQ_RANGE_HIGH;
259 sig_qual = dev->radio_rx_sig_qual;
260 vt->signal = abs(sig_qual) > delta ? 0 :
261 0xffff - (abs(sig_qual) * 0xffff) / delta;
262 vt->afc = sig_qual > delta ? 0 : sig_qual;
263 if (abs(sig_qual) > delta)
264 vt->rxsubchans = 0;
265 else if (dev->radio_rx_freq < FM_FREQ_RANGE_LOW || vt->signal < 0x8000)
266 vt->rxsubchans = V4L2_TUNER_SUB_MONO;
267 else if (dev->radio_rds_loop && !(dev->radio_tx_subchans & V4L2_TUNER_SUB_STEREO))
268 vt->rxsubchans = V4L2_TUNER_SUB_MONO;
269 else
270 vt->rxsubchans = V4L2_TUNER_SUB_STEREO;
271 if (dev->radio_rx_rds_enabled &&
272 (!dev->radio_rds_loop || (dev->radio_tx_subchans & V4L2_TUNER_SUB_RDS)) &&
273 dev->radio_rx_freq >= FM_FREQ_RANGE_LOW && vt->signal >= 0xc000)
274 vt->rxsubchans |= V4L2_TUNER_SUB_RDS;
275 if (dev->radio_rx_rds_controls)
276 vivid_radio_rds_init(dev);
277 vt->audmode = dev->radio_rx_audmode;
278 return 0;
279}
280
281int vivid_radio_rx_s_tuner(struct file *file, void *fh, const struct v4l2_tuner *vt)
282{
283 struct vivid_dev *dev = video_drvdata(file);
284
285 if (vt->index)
286 return -EINVAL;
287 dev->radio_rx_audmode = vt->audmode >= V4L2_TUNER_MODE_STEREO;
288 return 0;
289}
290
