Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux...
[linux/fpc-iii.git] / drivers / media / radio / wl128x / fmdrv_v4l2.c
blobfb42f0fd0c1f0fbe65cd2b8401854411e387f2ef
1 /*
2 * FM Driver for Connectivity chip of Texas Instruments.
3 * This file provides interfaces to V4L2 subsystem.
5 * This module registers with V4L2 subsystem as Radio
6 * data system interface (/dev/radio). During the registration,
7 * it will expose two set of function pointers.
9 * 1) File operation related API (open, close, read, write, poll...etc).
10 * 2) Set of V4L2 IOCTL complaint API.
12 * Copyright (C) 2011 Texas Instruments
13 * Author: Raja Mani <raja_mani@ti.com>
14 * Author: Manjunatha Halli <manjunatha_halli@ti.com>
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License version 2 as
18 * published by the Free Software Foundation.
20 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 * GNU General Public License for more details.
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
31 #include <linux/export.h>
33 #include "fmdrv.h"
34 #include "fmdrv_v4l2.h"
35 #include "fmdrv_common.h"
36 #include "fmdrv_rx.h"
37 #include "fmdrv_tx.h"
39 static struct video_device gradio_dev;
40 static u8 radio_disconnected;
42 /* -- V4L2 RADIO (/dev/radioX) device file operation interfaces --- */
44 /* Read RX RDS data */
45 static ssize_t fm_v4l2_fops_read(struct file *file, char __user * buf,
46 size_t count, loff_t *ppos)
48 u8 rds_mode;
49 int ret;
50 struct fmdev *fmdev;
52 fmdev = video_drvdata(file);
54 if (!radio_disconnected) {
55 fmerr("FM device is already disconnected\n");
56 return -EIO;
59 if (mutex_lock_interruptible(&fmdev->mutex))
60 return -ERESTARTSYS;
62 /* Turn on RDS mode if it is disabled */
63 ret = fm_rx_get_rds_mode(fmdev, &rds_mode);
64 if (ret < 0) {
65 fmerr("Unable to read current rds mode\n");
66 goto read_unlock;
69 if (rds_mode == FM_RDS_DISABLE) {
70 ret = fmc_set_rds_mode(fmdev, FM_RDS_ENABLE);
71 if (ret < 0) {
72 fmerr("Failed to enable rds mode\n");
73 goto read_unlock;
77 /* Copy RDS data from internal buffer to user buffer */
78 ret = fmc_transfer_rds_from_internal_buff(fmdev, file, buf, count);
79 read_unlock:
80 mutex_unlock(&fmdev->mutex);
81 return ret;
84 /* Write TX RDS data */
85 static ssize_t fm_v4l2_fops_write(struct file *file, const char __user * buf,
86 size_t count, loff_t *ppos)
88 struct tx_rds rds;
89 int ret;
90 struct fmdev *fmdev;
92 ret = copy_from_user(&rds, buf, sizeof(rds));
93 rds.text[sizeof(rds.text) - 1] = '\0';
94 fmdbg("(%d)type: %d, text %s, af %d\n",
95 ret, rds.text_type, rds.text, rds.af_freq);
96 if (ret)
97 return -EFAULT;
99 fmdev = video_drvdata(file);
100 if (mutex_lock_interruptible(&fmdev->mutex))
101 return -ERESTARTSYS;
102 fm_tx_set_radio_text(fmdev, rds.text, rds.text_type);
103 fm_tx_set_af(fmdev, rds.af_freq);
104 mutex_unlock(&fmdev->mutex);
106 return sizeof(rds);
109 static u32 fm_v4l2_fops_poll(struct file *file, struct poll_table_struct *pts)
111 int ret;
112 struct fmdev *fmdev;
114 fmdev = video_drvdata(file);
115 mutex_lock(&fmdev->mutex);
116 ret = fmc_is_rds_data_available(fmdev, file, pts);
117 mutex_unlock(&fmdev->mutex);
118 if (ret < 0)
119 return POLLIN | POLLRDNORM;
121 return 0;
125 * Handle open request for "/dev/radioX" device.
126 * Start with FM RX mode as default.
128 static int fm_v4l2_fops_open(struct file *file)
130 int ret;
131 struct fmdev *fmdev = NULL;
133 /* Don't allow multiple open */
134 if (radio_disconnected) {
135 fmerr("FM device is already opened\n");
136 return -EBUSY;
139 fmdev = video_drvdata(file);
141 if (mutex_lock_interruptible(&fmdev->mutex))
142 return -ERESTARTSYS;
143 ret = fmc_prepare(fmdev);
144 if (ret < 0) {
145 fmerr("Unable to prepare FM CORE\n");
146 goto open_unlock;
149 fmdbg("Load FM RX firmware..\n");
151 ret = fmc_set_mode(fmdev, FM_MODE_RX);
152 if (ret < 0) {
153 fmerr("Unable to load FM RX firmware\n");
154 goto open_unlock;
156 radio_disconnected = 1;
158 open_unlock:
159 mutex_unlock(&fmdev->mutex);
160 return ret;
163 static int fm_v4l2_fops_release(struct file *file)
165 int ret;
166 struct fmdev *fmdev;
168 fmdev = video_drvdata(file);
169 if (!radio_disconnected) {
170 fmdbg("FM device is already closed\n");
171 return 0;
174 mutex_lock(&fmdev->mutex);
175 ret = fmc_set_mode(fmdev, FM_MODE_OFF);
176 if (ret < 0) {
177 fmerr("Unable to turn off the chip\n");
178 goto release_unlock;
181 ret = fmc_release(fmdev);
182 if (ret < 0) {
183 fmerr("FM CORE release failed\n");
184 goto release_unlock;
186 radio_disconnected = 0;
188 release_unlock:
189 mutex_unlock(&fmdev->mutex);
190 return ret;
193 /* V4L2 RADIO (/dev/radioX) device IOCTL interfaces */
194 static int fm_v4l2_vidioc_querycap(struct file *file, void *priv,
195 struct v4l2_capability *capability)
197 strlcpy(capability->driver, FM_DRV_NAME, sizeof(capability->driver));
198 strlcpy(capability->card, FM_DRV_CARD_SHORT_NAME,
199 sizeof(capability->card));
200 sprintf(capability->bus_info, "UART");
201 capability->device_caps = V4L2_CAP_HW_FREQ_SEEK | V4L2_CAP_TUNER |
202 V4L2_CAP_RADIO | V4L2_CAP_MODULATOR |
203 V4L2_CAP_AUDIO | V4L2_CAP_READWRITE |
204 V4L2_CAP_RDS_CAPTURE;
205 capability->capabilities = capability->device_caps |
206 V4L2_CAP_DEVICE_CAPS;
208 return 0;
211 static int fm_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
213 struct fmdev *fmdev = container_of(ctrl->handler,
214 struct fmdev, ctrl_handler);
216 switch (ctrl->id) {
217 case V4L2_CID_TUNE_ANTENNA_CAPACITOR:
218 ctrl->val = fm_tx_get_tune_cap_val(fmdev);
219 break;
220 default:
221 fmwarn("%s: Unknown IOCTL: %d\n", __func__, ctrl->id);
222 break;
225 return 0;
228 static int fm_v4l2_s_ctrl(struct v4l2_ctrl *ctrl)
230 struct fmdev *fmdev = container_of(ctrl->handler,
231 struct fmdev, ctrl_handler);
233 switch (ctrl->id) {
234 case V4L2_CID_AUDIO_VOLUME: /* set volume */
235 return fm_rx_set_volume(fmdev, (u16)ctrl->val);
237 case V4L2_CID_AUDIO_MUTE: /* set mute */
238 return fmc_set_mute_mode(fmdev, (u8)ctrl->val);
240 case V4L2_CID_TUNE_POWER_LEVEL:
241 /* set TX power level - ext control */
242 return fm_tx_set_pwr_lvl(fmdev, (u8)ctrl->val);
244 case V4L2_CID_TUNE_PREEMPHASIS:
245 return fm_tx_set_preemph_filter(fmdev, (u8) ctrl->val);
247 default:
248 return -EINVAL;
252 static int fm_v4l2_vidioc_g_audio(struct file *file, void *priv,
253 struct v4l2_audio *audio)
255 memset(audio, 0, sizeof(*audio));
256 strcpy(audio->name, "Radio");
257 audio->capability = V4L2_AUDCAP_STEREO;
259 return 0;
262 static int fm_v4l2_vidioc_s_audio(struct file *file, void *priv,
263 const struct v4l2_audio *audio)
265 if (audio->index != 0)
266 return -EINVAL;
268 return 0;
271 /* Get tuner attributes. If current mode is NOT RX, return error */
272 static int fm_v4l2_vidioc_g_tuner(struct file *file, void *priv,
273 struct v4l2_tuner *tuner)
275 struct fmdev *fmdev = video_drvdata(file);
276 u32 bottom_freq;
277 u32 top_freq;
278 u16 stereo_mono_mode;
279 u16 rssilvl;
280 int ret;
282 if (tuner->index != 0)
283 return -EINVAL;
285 if (fmdev->curr_fmmode != FM_MODE_RX)
286 return -EPERM;
288 ret = fm_rx_get_band_freq_range(fmdev, &bottom_freq, &top_freq);
289 if (ret != 0)
290 return ret;
292 ret = fm_rx_get_stereo_mono(fmdev, &stereo_mono_mode);
293 if (ret != 0)
294 return ret;
296 ret = fm_rx_get_rssi_level(fmdev, &rssilvl);
297 if (ret != 0)
298 return ret;
300 strcpy(tuner->name, "FM");
301 tuner->type = V4L2_TUNER_RADIO;
302 /* Store rangelow and rangehigh freq in unit of 62.5 Hz */
303 tuner->rangelow = bottom_freq * 16;
304 tuner->rangehigh = top_freq * 16;
305 tuner->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO |
306 ((fmdev->rx.rds.flag == FM_RDS_ENABLE) ? V4L2_TUNER_SUB_RDS : 0);
307 tuner->capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_RDS |
308 V4L2_TUNER_CAP_LOW |
309 V4L2_TUNER_CAP_HWSEEK_BOUNDED |
310 V4L2_TUNER_CAP_HWSEEK_WRAP;
311 tuner->audmode = (stereo_mono_mode ?
312 V4L2_TUNER_MODE_MONO : V4L2_TUNER_MODE_STEREO);
315 * Actual rssi value lies in between -128 to +127.
316 * Convert this range from 0 to 255 by adding +128
318 rssilvl += 128;
321 * Return signal strength value should be within 0 to 65535.
322 * Find out correct signal radio by multiplying (65535/255) = 257
324 tuner->signal = rssilvl * 257;
325 tuner->afc = 0;
327 return ret;
331 * Set tuner attributes. If current mode is NOT RX, set to RX.
332 * Currently, we set only audio mode (mono/stereo) and RDS state (on/off).
333 * Should we set other tuner attributes, too?
335 static int fm_v4l2_vidioc_s_tuner(struct file *file, void *priv,
336 const struct v4l2_tuner *tuner)
338 struct fmdev *fmdev = video_drvdata(file);
339 u16 aud_mode;
340 u8 rds_mode;
341 int ret;
343 if (tuner->index != 0)
344 return -EINVAL;
346 aud_mode = (tuner->audmode == V4L2_TUNER_MODE_STEREO) ?
347 FM_STEREO_MODE : FM_MONO_MODE;
348 rds_mode = (tuner->rxsubchans & V4L2_TUNER_SUB_RDS) ?
349 FM_RDS_ENABLE : FM_RDS_DISABLE;
351 if (fmdev->curr_fmmode != FM_MODE_RX) {
352 ret = fmc_set_mode(fmdev, FM_MODE_RX);
353 if (ret < 0) {
354 fmerr("Failed to set RX mode\n");
355 return ret;
359 ret = fmc_set_stereo_mono(fmdev, aud_mode);
360 if (ret < 0) {
361 fmerr("Failed to set RX stereo/mono mode\n");
362 return ret;
365 ret = fmc_set_rds_mode(fmdev, rds_mode);
366 if (ret < 0)
367 fmerr("Failed to set RX RDS mode\n");
369 return ret;
372 /* Get tuner or modulator radio frequency */
373 static int fm_v4l2_vidioc_g_freq(struct file *file, void *priv,
374 struct v4l2_frequency *freq)
376 struct fmdev *fmdev = video_drvdata(file);
377 int ret;
379 ret = fmc_get_freq(fmdev, &freq->frequency);
380 if (ret < 0) {
381 fmerr("Failed to get frequency\n");
382 return ret;
385 /* Frequency unit of 62.5 Hz*/
386 freq->frequency = (u32) freq->frequency * 16;
388 return 0;
391 /* Set tuner or modulator radio frequency */
392 static int fm_v4l2_vidioc_s_freq(struct file *file, void *priv,
393 const struct v4l2_frequency *freq)
395 struct fmdev *fmdev = video_drvdata(file);
398 * As V4L2_TUNER_CAP_LOW is set 1 user sends the frequency
399 * in units of 62.5 Hz.
401 return fmc_set_freq(fmdev, freq->frequency / 16);
404 /* Set hardware frequency seek. If current mode is NOT RX, set it RX. */
405 static int fm_v4l2_vidioc_s_hw_freq_seek(struct file *file, void *priv,
406 const struct v4l2_hw_freq_seek *seek)
408 struct fmdev *fmdev = video_drvdata(file);
409 int ret;
411 if (file->f_flags & O_NONBLOCK)
412 return -EWOULDBLOCK;
414 if (fmdev->curr_fmmode != FM_MODE_RX) {
415 ret = fmc_set_mode(fmdev, FM_MODE_RX);
416 if (ret != 0) {
417 fmerr("Failed to set RX mode\n");
418 return ret;
422 ret = fm_rx_seek(fmdev, seek->seek_upward, seek->wrap_around,
423 seek->spacing);
424 if (ret < 0)
425 fmerr("RX seek failed - %d\n", ret);
427 return ret;
429 /* Get modulator attributes. If mode is not TX, return no attributes. */
430 static int fm_v4l2_vidioc_g_modulator(struct file *file, void *priv,
431 struct v4l2_modulator *mod)
433 struct fmdev *fmdev = video_drvdata(file);
435 if (mod->index != 0)
436 return -EINVAL;
438 if (fmdev->curr_fmmode != FM_MODE_TX)
439 return -EPERM;
441 mod->txsubchans = ((fmdev->tx_data.aud_mode == FM_STEREO_MODE) ?
442 V4L2_TUNER_SUB_STEREO : V4L2_TUNER_SUB_MONO) |
443 ((fmdev->tx_data.rds.flag == FM_RDS_ENABLE) ?
444 V4L2_TUNER_SUB_RDS : 0);
446 mod->capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_RDS |
447 V4L2_TUNER_CAP_LOW;
449 return 0;
452 /* Set modulator attributes. If mode is not TX, set to TX. */
453 static int fm_v4l2_vidioc_s_modulator(struct file *file, void *priv,
454 const struct v4l2_modulator *mod)
456 struct fmdev *fmdev = video_drvdata(file);
457 u8 rds_mode;
458 u16 aud_mode;
459 int ret;
461 if (mod->index != 0)
462 return -EINVAL;
464 if (fmdev->curr_fmmode != FM_MODE_TX) {
465 ret = fmc_set_mode(fmdev, FM_MODE_TX);
466 if (ret != 0) {
467 fmerr("Failed to set TX mode\n");
468 return ret;
472 aud_mode = (mod->txsubchans & V4L2_TUNER_SUB_STEREO) ?
473 FM_STEREO_MODE : FM_MONO_MODE;
474 rds_mode = (mod->txsubchans & V4L2_TUNER_SUB_RDS) ?
475 FM_RDS_ENABLE : FM_RDS_DISABLE;
476 ret = fm_tx_set_stereo_mono(fmdev, aud_mode);
477 if (ret < 0) {
478 fmerr("Failed to set mono/stereo mode for TX\n");
479 return ret;
481 ret = fm_tx_set_rds_mode(fmdev, rds_mode);
482 if (ret < 0)
483 fmerr("Failed to set rds mode for TX\n");
485 return ret;
488 static const struct v4l2_file_operations fm_drv_fops = {
489 .owner = THIS_MODULE,
490 .read = fm_v4l2_fops_read,
491 .write = fm_v4l2_fops_write,
492 .poll = fm_v4l2_fops_poll,
493 .unlocked_ioctl = video_ioctl2,
494 .open = fm_v4l2_fops_open,
495 .release = fm_v4l2_fops_release,
498 static const struct v4l2_ctrl_ops fm_ctrl_ops = {
499 .s_ctrl = fm_v4l2_s_ctrl,
500 .g_volatile_ctrl = fm_g_volatile_ctrl,
502 static const struct v4l2_ioctl_ops fm_drv_ioctl_ops = {
503 .vidioc_querycap = fm_v4l2_vidioc_querycap,
504 .vidioc_g_audio = fm_v4l2_vidioc_g_audio,
505 .vidioc_s_audio = fm_v4l2_vidioc_s_audio,
506 .vidioc_g_tuner = fm_v4l2_vidioc_g_tuner,
507 .vidioc_s_tuner = fm_v4l2_vidioc_s_tuner,
508 .vidioc_g_frequency = fm_v4l2_vidioc_g_freq,
509 .vidioc_s_frequency = fm_v4l2_vidioc_s_freq,
510 .vidioc_s_hw_freq_seek = fm_v4l2_vidioc_s_hw_freq_seek,
511 .vidioc_g_modulator = fm_v4l2_vidioc_g_modulator,
512 .vidioc_s_modulator = fm_v4l2_vidioc_s_modulator
515 /* V4L2 RADIO device parent structure */
516 static struct video_device fm_viddev_template = {
517 .fops = &fm_drv_fops,
518 .ioctl_ops = &fm_drv_ioctl_ops,
519 .name = FM_DRV_NAME,
520 .release = video_device_release_empty,
522 * To ensure both the tuner and modulator ioctls are accessible we
523 * set the vfl_dir to M2M to indicate this.
525 * It is not really a mem2mem device of course, but it can both receive
526 * and transmit using the same radio device. It's the only radio driver
527 * that does this and it should really be split in two radio devices,
528 * but that would affect applications using this driver.
530 .vfl_dir = VFL_DIR_M2M,
533 int fm_v4l2_init_video_device(struct fmdev *fmdev, int radio_nr)
535 struct v4l2_ctrl *ctrl;
536 int ret;
538 strlcpy(fmdev->v4l2_dev.name, FM_DRV_NAME, sizeof(fmdev->v4l2_dev.name));
539 ret = v4l2_device_register(NULL, &fmdev->v4l2_dev);
540 if (ret < 0)
541 return ret;
543 /* Init mutex for core locking */
544 mutex_init(&fmdev->mutex);
546 /* Setup FM driver's V4L2 properties */
547 gradio_dev = fm_viddev_template;
549 video_set_drvdata(&gradio_dev, fmdev);
551 gradio_dev.lock = &fmdev->mutex;
552 gradio_dev.v4l2_dev = &fmdev->v4l2_dev;
554 /* Register with V4L2 subsystem as RADIO device */
555 if (video_register_device(&gradio_dev, VFL_TYPE_RADIO, radio_nr)) {
556 fmerr("Could not register video device\n");
557 return -ENOMEM;
560 fmdev->radio_dev = &gradio_dev;
562 /* Register to v4l2 ctrl handler framework */
563 fmdev->radio_dev->ctrl_handler = &fmdev->ctrl_handler;
565 ret = v4l2_ctrl_handler_init(&fmdev->ctrl_handler, 5);
566 if (ret < 0) {
567 fmerr("(fmdev): Can't init ctrl handler\n");
568 v4l2_ctrl_handler_free(&fmdev->ctrl_handler);
569 return -EBUSY;
573 * Following controls are handled by V4L2 control framework.
574 * Added in ascending ID order.
576 v4l2_ctrl_new_std(&fmdev->ctrl_handler, &fm_ctrl_ops,
577 V4L2_CID_AUDIO_VOLUME, FM_RX_VOLUME_MIN,
578 FM_RX_VOLUME_MAX, 1, FM_RX_VOLUME_MAX);
580 v4l2_ctrl_new_std(&fmdev->ctrl_handler, &fm_ctrl_ops,
581 V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
583 v4l2_ctrl_new_std_menu(&fmdev->ctrl_handler, &fm_ctrl_ops,
584 V4L2_CID_TUNE_PREEMPHASIS, V4L2_PREEMPHASIS_75_uS,
585 0, V4L2_PREEMPHASIS_75_uS);
587 v4l2_ctrl_new_std(&fmdev->ctrl_handler, &fm_ctrl_ops,
588 V4L2_CID_TUNE_POWER_LEVEL, FM_PWR_LVL_LOW,
589 FM_PWR_LVL_HIGH, 1, FM_PWR_LVL_HIGH);
591 ctrl = v4l2_ctrl_new_std(&fmdev->ctrl_handler, &fm_ctrl_ops,
592 V4L2_CID_TUNE_ANTENNA_CAPACITOR, 0,
593 255, 1, 255);
595 if (ctrl)
596 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
598 return 0;
601 void *fm_v4l2_deinit_video_device(void)
603 struct fmdev *fmdev;
606 fmdev = video_get_drvdata(&gradio_dev);
608 /* Unregister to v4l2 ctrl handler framework*/
609 v4l2_ctrl_handler_free(&fmdev->ctrl_handler);
611 /* Unregister RADIO device from V4L2 subsystem */
612 video_unregister_device(&gradio_dev);
614 v4l2_device_unregister(&fmdev->v4l2_dev);
616 return fmdev;