/* * FM Driver for Connectivity chip of Texas Instruments. * This file provides interfaces to V4L2 subsystem. * * This module registers with V4L2 subsystem as Radio * data system interface (/dev/radio). During the registration, * it will expose two set of function pointers. * * 1) File operation related API (open, close, read, write, poll...etc). * 2) Set of V4L2 IOCTL complaint API. * * Copyright (C) 2011 Texas Instruments * Author: Raja Mani * Author: Manjunatha Halli * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * */ #include #include "fmdrv.h" #include "fmdrv_v4l2.h" #include "fmdrv_common.h" #include "fmdrv_rx.h" #include "fmdrv_tx.h" static struct video_device *gradio_dev; static u8 radio_disconnected; /* -- V4L2 RADIO (/dev/radioX) device file operation interfaces --- */ /* Read RX RDS data */ static ssize_t fm_v4l2_fops_read(struct file *file, char __user * buf, size_t count, loff_t *ppos) { u8 rds_mode; int ret; struct fmdev *fmdev; fmdev = video_drvdata(file); if (!radio_disconnected) { fmerr("FM device is already disconnected\n"); return -EIO; } if (mutex_lock_interruptible(&fmdev->mutex)) return -ERESTARTSYS; /* Turn on RDS mode if it is disabled */ ret = fm_rx_get_rds_mode(fmdev, &rds_mode); if (ret < 0) { fmerr("Unable to read current rds mode\n"); goto read_unlock; } if (rds_mode == FM_RDS_DISABLE) { ret = fmc_set_rds_mode(fmdev, FM_RDS_ENABLE); if (ret < 0) { fmerr("Failed to enable rds mode\n"); goto read_unlock; } } /* Copy RDS data from internal buffer to user buffer */ ret = fmc_transfer_rds_from_internal_buff(fmdev, file, buf, count); read_unlock: mutex_unlock(&fmdev->mutex); return ret; } /* Write TX RDS data */ static ssize_t fm_v4l2_fops_write(struct file *file, const char __user * buf, size_t count, loff_t *ppos) { struct tx_rds rds; int ret; struct fmdev *fmdev; ret = copy_from_user(&rds, buf, sizeof(rds)); rds.text[sizeof(rds.text) - 1] = '\0'; fmdbg("(%d)type: %d, text %s, af %d\n", ret, rds.text_type, rds.text, rds.af_freq); if (ret) return -EFAULT; fmdev = video_drvdata(file); if (mutex_lock_interruptible(&fmdev->mutex)) return -ERESTARTSYS; fm_tx_set_radio_text(fmdev, rds.text, rds.text_type); fm_tx_set_af(fmdev, rds.af_freq); mutex_unlock(&fmdev->mutex); return sizeof(rds); } static u32 fm_v4l2_fops_poll(struct file *file, struct poll_table_struct *pts) { int ret; struct fmdev *fmdev; fmdev = video_drvdata(file); mutex_lock(&fmdev->mutex); ret = fmc_is_rds_data_available(fmdev, file, pts); mutex_unlock(&fmdev->mutex); if (ret < 0) return POLLIN | POLLRDNORM; return 0; } /* * Handle open request for "/dev/radioX" device. * Start with FM RX mode as default. */ static int fm_v4l2_fops_open(struct file *file) { int ret; struct fmdev *fmdev = NULL; /* Don't allow multiple open */ if (radio_disconnected) { fmerr("FM device is already opened\n"); return -EBUSY; } fmdev = video_drvdata(file); if (mutex_lock_interruptible(&fmdev->mutex)) return -ERESTARTSYS; ret = fmc_prepare(fmdev); if (ret < 0) { fmerr("Unable to prepare FM CORE\n"); goto open_unlock; } fmdbg("Load FM RX firmware..\n"); ret = fmc_set_mode(fmdev, FM_MODE_RX); if (ret < 0) { fmerr("Unable to load FM RX firmware\n"); goto open_unlock; } radio_disconnected = 1; open_unlock: mutex_unlock(&fmdev->mutex); return ret; } static int fm_v4l2_fops_release(struct file *file) { int ret; struct fmdev *fmdev; fmdev = video_drvdata(file); if (!radio_disconnected) { fmdbg("FM device is already closed\n"); return 0; } mutex_lock(&fmdev->mutex); ret = fmc_set_mode(fmdev, FM_MODE_OFF); if (ret < 0) { fmerr("Unable to turn off the chip\n"); goto release_unlock; } ret = fmc_release(fmdev); if (ret < 0) { fmerr("FM CORE release failed\n"); goto release_unlock; } radio_disconnected = 0; release_unlock: mutex_unlock(&fmdev->mutex); return ret; } /* V4L2 RADIO (/dev/radioX) device IOCTL interfaces */ static int fm_v4l2_vidioc_querycap(struct file *file, void *priv, struct v4l2_capability *capability) { strlcpy(capability->driver, FM_DRV_NAME, sizeof(capability->driver)); strlcpy(capability->card, FM_DRV_CARD_SHORT_NAME, sizeof(capability->card)); sprintf(capability->bus_info, "UART"); capability->device_caps = V4L2_CAP_HW_FREQ_SEEK | V4L2_CAP_TUNER | V4L2_CAP_RADIO | V4L2_CAP_MODULATOR | V4L2_CAP_AUDIO | V4L2_CAP_READWRITE | V4L2_CAP_RDS_CAPTURE; capability->capabilities = capability->device_caps | V4L2_CAP_DEVICE_CAPS; return 0; } static int fm_g_volatile_ctrl(struct v4l2_ctrl *ctrl) { struct fmdev *fmdev = container_of(ctrl->handler, struct fmdev, ctrl_handler); switch (ctrl->id) { case V4L2_CID_TUNE_ANTENNA_CAPACITOR: ctrl->val = fm_tx_get_tune_cap_val(fmdev); break; default: fmwarn("%s: Unknown IOCTL: %d\n", __func__, ctrl->id); break; } return 0; } static int fm_v4l2_s_ctrl(struct v4l2_ctrl *ctrl) { struct fmdev *fmdev = container_of(ctrl->handler, struct fmdev, ctrl_handler); switch (ctrl->id) { case V4L2_CID_AUDIO_VOLUME: /* set volume */ return fm_rx_set_volume(fmdev, (u16)ctrl->val); case V4L2_CID_AUDIO_MUTE: /* set mute */ return fmc_set_mute_mode(fmdev, (u8)ctrl->val); case V4L2_CID_TUNE_POWER_LEVEL: /* set TX power level - ext control */ return fm_tx_set_pwr_lvl(fmdev, (u8)ctrl->val); case V4L2_CID_TUNE_PREEMPHASIS: return fm_tx_set_preemph_filter(fmdev, (u8) ctrl->val); default: return -EINVAL; } } static int fm_v4l2_vidioc_g_audio(struct file *file, void *priv, struct v4l2_audio *audio) { memset(audio, 0, sizeof(*audio)); strcpy(audio->name, "Radio"); audio->capability = V4L2_AUDCAP_STEREO; return 0; } static int fm_v4l2_vidioc_s_audio(struct file *file, void *priv, const struct v4l2_audio *audio) { if (audio->index != 0) return -EINVAL; return 0; } /* Get tuner attributes. If current mode is NOT RX, return error */ static int fm_v4l2_vidioc_g_tuner(struct file *file, void *priv, struct v4l2_tuner *tuner) { struct fmdev *fmdev = video_drvdata(file); u32 bottom_freq; u32 top_freq; u16 stereo_mono_mode; u16 rssilvl; int ret; if (tuner->index != 0) return -EINVAL; if (fmdev->curr_fmmode != FM_MODE_RX) return -EPERM; ret = fm_rx_get_band_freq_range(fmdev, &bottom_freq, &top_freq); if (ret != 0) return ret; ret = fm_rx_get_stereo_mono(fmdev, &stereo_mono_mode); if (ret != 0) return ret; ret = fm_rx_get_rssi_level(fmdev, &rssilvl); if (ret != 0) return ret; strcpy(tuner->name, "FM"); tuner->type = V4L2_TUNER_RADIO; /* Store rangelow and rangehigh freq in unit of 62.5 Hz */ tuner->rangelow = bottom_freq * 16; tuner->rangehigh = top_freq * 16; tuner->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO | ((fmdev->rx.rds.flag == FM_RDS_ENABLE) ? V4L2_TUNER_SUB_RDS : 0); tuner->capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_RDS | V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_HWSEEK_BOUNDED | V4L2_TUNER_CAP_HWSEEK_WRAP; tuner->audmode = (stereo_mono_mode ? V4L2_TUNER_MODE_MONO : V4L2_TUNER_MODE_STEREO); /* * Actual rssi value lies in between -128 to +127. * Convert this range from 0 to 255 by adding +128 */ rssilvl += 128; /* * Return signal strength value should be within 0 to 65535. * Find out correct signal radio by multiplying (65535/255) = 257 */ tuner->signal = rssilvl * 257; tuner->afc = 0; return ret; } /* * Set tuner attributes. If current mode is NOT RX, set to RX. * Currently, we set only audio mode (mono/stereo) and RDS state (on/off). * Should we set other tuner attributes, too? */ static int fm_v4l2_vidioc_s_tuner(struct file *file, void *priv, const struct v4l2_tuner *tuner) { struct fmdev *fmdev = video_drvdata(file); u16 aud_mode; u8 rds_mode; int ret; if (tuner->index != 0) return -EINVAL; aud_mode = (tuner->audmode == V4L2_TUNER_MODE_STEREO) ? FM_STEREO_MODE : FM_MONO_MODE; rds_mode = (tuner->rxsubchans & V4L2_TUNER_SUB_RDS) ? FM_RDS_ENABLE : FM_RDS_DISABLE; if (fmdev->curr_fmmode != FM_MODE_RX) { ret = fmc_set_mode(fmdev, FM_MODE_RX); if (ret < 0) { fmerr("Failed to set RX mode\n"); return ret; } } ret = fmc_set_stereo_mono(fmdev, aud_mode); if (ret < 0) { fmerr("Failed to set RX stereo/mono mode\n"); return ret; } ret = fmc_set_rds_mode(fmdev, rds_mode); if (ret < 0) fmerr("Failed to set RX RDS mode\n"); return ret; } /* Get tuner or modulator radio frequency */ static int fm_v4l2_vidioc_g_freq(struct file *file, void *priv, struct v4l2_frequency *freq) { struct fmdev *fmdev = video_drvdata(file); int ret; ret = fmc_get_freq(fmdev, &freq->frequency); if (ret < 0) { fmerr("Failed to get frequency\n"); return ret; } /* Frequency unit of 62.5 Hz*/ freq->frequency = (u32) freq->frequency * 16; return 0; } /* Set tuner or modulator radio frequency */ static int fm_v4l2_vidioc_s_freq(struct file *file, void *priv, const struct v4l2_frequency *freq) { struct fmdev *fmdev = video_drvdata(file); /* * As V4L2_TUNER_CAP_LOW is set 1 user sends the frequency * in units of 62.5 Hz. */ return fmc_set_freq(fmdev, freq->frequency / 16); } /* Set hardware frequency seek. If current mode is NOT RX, set it RX. */ static int fm_v4l2_vidioc_s_hw_freq_seek(struct file *file, void *priv, const struct v4l2_hw_freq_seek *seek) { struct fmdev *fmdev = video_drvdata(file); int ret; if (file->f_flags & O_NONBLOCK) return -EWOULDBLOCK; if (fmdev->curr_fmmode != FM_MODE_RX) { ret = fmc_set_mode(fmdev, FM_MODE_RX); if (ret != 0) { fmerr("Failed to set RX mode\n"); return ret; } } ret = fm_rx_seek(fmdev, seek->seek_upward, seek->wrap_around, seek->spacing); if (ret < 0) fmerr("RX seek failed - %d\n", ret); return ret; } /* Get modulator attributes. If mode is not TX, return no attributes. */ static int fm_v4l2_vidioc_g_modulator(struct file *file, void *priv, struct v4l2_modulator *mod) { struct fmdev *fmdev = video_drvdata(file); if (mod->index != 0) return -EINVAL; if (fmdev->curr_fmmode != FM_MODE_TX) return -EPERM; mod->txsubchans = ((fmdev->tx_data.aud_mode == FM_STEREO_MODE) ? V4L2_TUNER_SUB_STEREO : V4L2_TUNER_SUB_MONO) | ((fmdev->tx_data.rds.flag == FM_RDS_ENABLE) ? V4L2_TUNER_SUB_RDS : 0); mod->capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_RDS | V4L2_TUNER_CAP_LOW; return 0; } /* Set modulator attributes. If mode is not TX, set to TX. */ static int fm_v4l2_vidioc_s_modulator(struct file *file, void *priv, const struct v4l2_modulator *mod) { struct fmdev *fmdev = video_drvdata(file); u8 rds_mode; u16 aud_mode; int ret; if (mod->index != 0) return -EINVAL; if (fmdev->curr_fmmode != FM_MODE_TX) { ret = fmc_set_mode(fmdev, FM_MODE_TX); if (ret != 0) { fmerr("Failed to set TX mode\n"); return ret; } } aud_mode = (mod->txsubchans & V4L2_TUNER_SUB_STEREO) ? FM_STEREO_MODE : FM_MONO_MODE; rds_mode = (mod->txsubchans & V4L2_TUNER_SUB_RDS) ? FM_RDS_ENABLE : FM_RDS_DISABLE; ret = fm_tx_set_stereo_mono(fmdev, aud_mode); if (ret < 0) { fmerr("Failed to set mono/stereo mode for TX\n"); return ret; } ret = fm_tx_set_rds_mode(fmdev, rds_mode); if (ret < 0) fmerr("Failed to set rds mode for TX\n"); return ret; } static const struct v4l2_file_operations fm_drv_fops = { .owner = THIS_MODULE, .read = fm_v4l2_fops_read, .write = fm_v4l2_fops_write, .poll = fm_v4l2_fops_poll, .unlocked_ioctl = video_ioctl2, .open = fm_v4l2_fops_open, .release = fm_v4l2_fops_release, }; static const struct v4l2_ctrl_ops fm_ctrl_ops = { .s_ctrl = fm_v4l2_s_ctrl, .g_volatile_ctrl = fm_g_volatile_ctrl, }; static const struct v4l2_ioctl_ops fm_drv_ioctl_ops = { .vidioc_querycap = fm_v4l2_vidioc_querycap, .vidioc_g_audio = fm_v4l2_vidioc_g_audio, .vidioc_s_audio = fm_v4l2_vidioc_s_audio, .vidioc_g_tuner = fm_v4l2_vidioc_g_tuner, .vidioc_s_tuner = fm_v4l2_vidioc_s_tuner, .vidioc_g_frequency = fm_v4l2_vidioc_g_freq, .vidioc_s_frequency = fm_v4l2_vidioc_s_freq, .vidioc_s_hw_freq_seek = fm_v4l2_vidioc_s_hw_freq_seek, .vidioc_g_modulator = fm_v4l2_vidioc_g_modulator, .vidioc_s_modulator = fm_v4l2_vidioc_s_modulator }; /* V4L2 RADIO device parent structure */ static struct video_device fm_viddev_template = { .fops = &fm_drv_fops, .ioctl_ops = &fm_drv_ioctl_ops, .name = FM_DRV_NAME, .release = video_device_release, /* * To ensure both the tuner and modulator ioctls are accessible we * set the vfl_dir to M2M to indicate this. * * It is not really a mem2mem device of course, but it can both receive * and transmit using the same radio device. It's the only radio driver * that does this and it should really be split in two radio devices, * but that would affect applications using this driver. */ .vfl_dir = VFL_DIR_M2M, }; int fm_v4l2_init_video_device(struct fmdev *fmdev, int radio_nr) { struct v4l2_ctrl *ctrl; int ret; strlcpy(fmdev->v4l2_dev.name, FM_DRV_NAME, sizeof(fmdev->v4l2_dev.name)); ret = v4l2_device_register(NULL, &fmdev->v4l2_dev); if (ret < 0) return ret; /* Init mutex for core locking */ mutex_init(&fmdev->mutex); /* Allocate new video device */ gradio_dev = video_device_alloc(); if (NULL == gradio_dev) { fmerr("Can't allocate video device\n"); return -ENOMEM; } /* Setup FM driver's V4L2 properties */ memcpy(gradio_dev, &fm_viddev_template, sizeof(fm_viddev_template)); video_set_drvdata(gradio_dev, fmdev); gradio_dev->lock = &fmdev->mutex; gradio_dev->v4l2_dev = &fmdev->v4l2_dev; /* Register with V4L2 subsystem as RADIO device */ if (video_register_device(gradio_dev, VFL_TYPE_RADIO, radio_nr)) { video_device_release(gradio_dev); fmerr("Could not register video device\n"); return -ENOMEM; } fmdev->radio_dev = gradio_dev; /* Register to v4l2 ctrl handler framework */ fmdev->radio_dev->ctrl_handler = &fmdev->ctrl_handler; ret = v4l2_ctrl_handler_init(&fmdev->ctrl_handler, 5); if (ret < 0) { fmerr("(fmdev): Can't init ctrl handler\n"); v4l2_ctrl_handler_free(&fmdev->ctrl_handler); return -EBUSY; } /* * Following controls are handled by V4L2 control framework. * Added in ascending ID order. */ v4l2_ctrl_new_std(&fmdev->ctrl_handler, &fm_ctrl_ops, V4L2_CID_AUDIO_VOLUME, FM_RX_VOLUME_MIN, FM_RX_VOLUME_MAX, 1, FM_RX_VOLUME_MAX); v4l2_ctrl_new_std(&fmdev->ctrl_handler, &fm_ctrl_ops, V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1); v4l2_ctrl_new_std_menu(&fmdev->ctrl_handler, &fm_ctrl_ops, V4L2_CID_TUNE_PREEMPHASIS, V4L2_PREEMPHASIS_75_uS, 0, V4L2_PREEMPHASIS_75_uS); v4l2_ctrl_new_std(&fmdev->ctrl_handler, &fm_ctrl_ops, V4L2_CID_TUNE_POWER_LEVEL, FM_PWR_LVL_LOW, FM_PWR_LVL_HIGH, 1, FM_PWR_LVL_HIGH); ctrl = v4l2_ctrl_new_std(&fmdev->ctrl_handler, &fm_ctrl_ops, V4L2_CID_TUNE_ANTENNA_CAPACITOR, 0, 255, 1, 255); if (ctrl) ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE; return 0; } void *fm_v4l2_deinit_video_device(void) { struct fmdev *fmdev; fmdev = video_get_drvdata(gradio_dev); /* Unregister to v4l2 ctrl handler framework*/ v4l2_ctrl_handler_free(&fmdev->ctrl_handler); /* Unregister RADIO device from V4L2 subsystem */ video_unregister_device(gradio_dev); v4l2_device_unregister(&fmdev->v4l2_dev); return fmdev; }