/* * A driver for the AverMedia MR 800 USB FM radio. This device plugs * into both the USB and an analog audio input, so this thing * only deals with initialization and frequency setting, the * audio data has to be handled by a sound driver. * * Copyright (c) 2008 Alexey Klimov * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * 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 */ /* * Big thanks to authors and contributors of dsbr100.c and radio-si470x.c * * When work was looked pretty good, i discover this: * http://av-usbradio.sourceforge.net/index.php * http://sourceforge.net/projects/av-usbradio/ * Latest release of theirs project was in 2005. * Probably, this driver could be improved through using their * achievements (specifications given). * Also, Faidon Liambotis wrote nice driver for this radio * in 2007. He allowed to use his driver to improve current mr800 radio driver. * http://kerneltrap.org/mailarchive/linux-usb-devel/2007/10/11/342492 * * Version 0.01: First working version. * It's required to blacklist AverMedia USB Radio * in usbhid/hid-quirks.c * Version 0.10: A lot of cleanups and fixes: unpluging the device, * few mutex locks were added, codinstyle issues, etc. * Added stereo support. Thanks to * Douglas Schilling Landgraf and * David Ellingsworth * for discussion, help and support. * Version 0.11: Converted to v4l2_device. * * Many things to do: * - Correct power management of device (suspend & resume) * - Add code for scanning and smooth tuning * - Add code for sensitivity value * - Correct mistakes * - In Japan another FREQ_MIN and FREQ_MAX */ /* kernel includes */ #include #include #include #include #include #include #include #include #include #include #include /* for KERNEL_VERSION MACRO */ #include /* driver and module definitions */ #define DRIVER_AUTHOR "Alexey Klimov " #define DRIVER_DESC "AverMedia MR 800 USB FM radio driver" #define DRIVER_VERSION "0.11" #define RADIO_VERSION KERNEL_VERSION(0, 1, 1) MODULE_AUTHOR(DRIVER_AUTHOR); MODULE_DESCRIPTION(DRIVER_DESC); MODULE_LICENSE("GPL"); #define USB_AMRADIO_VENDOR 0x07ca #define USB_AMRADIO_PRODUCT 0xb800 /* dev_warn macro with driver name */ #define MR800_DRIVER_NAME "radio-mr800" #define amradio_dev_warn(dev, fmt, arg...) \ dev_warn(dev, MR800_DRIVER_NAME " - " fmt, ##arg) /* Probably USB_TIMEOUT should be modified in module parameter */ #define BUFFER_LENGTH 8 #define USB_TIMEOUT 500 /* Frequency limits in MHz -- these are European values. For Japanese devices, that would be 76 and 91. */ #define FREQ_MIN 87.5 #define FREQ_MAX 108.0 #define FREQ_MUL 16000 /* * Commands that device should understand * List isnt full and will be updated with implementation of new functions */ #define AMRADIO_SET_FREQ 0xa4 #define AMRADIO_SET_MUTE 0xab #define AMRADIO_SET_MONO 0xae /* Comfortable defines for amradio_set_mute */ #define AMRADIO_START 0x00 #define AMRADIO_STOP 0x01 /* Comfortable defines for amradio_set_stereo */ #define WANT_STEREO 0x00 #define WANT_MONO 0x01 /* module parameter */ static int radio_nr = -1; module_param(radio_nr, int, 0); MODULE_PARM_DESC(radio_nr, "Radio Nr"); static int usb_amradio_probe(struct usb_interface *intf, const struct usb_device_id *id); static void usb_amradio_disconnect(struct usb_interface *intf); static int usb_amradio_open(struct file *file); static int usb_amradio_close(struct file *file); static int usb_amradio_suspend(struct usb_interface *intf, pm_message_t message); static int usb_amradio_resume(struct usb_interface *intf); /* Data for one (physical) device */ struct amradio_device { /* reference to USB and video device */ struct usb_device *usbdev; struct video_device *videodev; struct v4l2_device v4l2_dev; unsigned char *buffer; struct mutex lock; /* buffer locking */ int curfreq; int stereo; int users; int removed; int muted; }; /* USB Device ID List */ static struct usb_device_id usb_amradio_device_table[] = { {USB_DEVICE_AND_INTERFACE_INFO(USB_AMRADIO_VENDOR, USB_AMRADIO_PRODUCT, USB_CLASS_HID, 0, 0) }, { } /* Terminating entry */ }; MODULE_DEVICE_TABLE(usb, usb_amradio_device_table); /* USB subsystem interface */ static struct usb_driver usb_amradio_driver = { .name = MR800_DRIVER_NAME, .probe = usb_amradio_probe, .disconnect = usb_amradio_disconnect, .suspend = usb_amradio_suspend, .resume = usb_amradio_resume, .reset_resume = usb_amradio_resume, .id_table = usb_amradio_device_table, .supports_autosuspend = 0, }; /* switch on/off the radio. Send 8 bytes to device */ static int amradio_set_mute(struct amradio_device *radio, char argument) { int retval; int size; /* safety check */ if (radio->removed) return -EIO; mutex_lock(&radio->lock); radio->buffer[0] = 0x00; radio->buffer[1] = 0x55; radio->buffer[2] = 0xaa; radio->buffer[3] = 0x00; radio->buffer[4] = AMRADIO_SET_MUTE; radio->buffer[5] = argument; radio->buffer[6] = 0x00; radio->buffer[7] = 0x00; retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2), (void *) (radio->buffer), BUFFER_LENGTH, &size, USB_TIMEOUT); if (retval < 0 || size != BUFFER_LENGTH) { mutex_unlock(&radio->lock); return retval; } radio->muted = argument; mutex_unlock(&radio->lock); return retval; } /* set a frequency, freq is defined by v4l's TUNER_LOW, i.e. 1/16th kHz */ static int amradio_setfreq(struct amradio_device *radio, int freq) { int retval; int size; unsigned short freq_send = 0x10 + (freq >> 3) / 25; /* safety check */ if (radio->removed) return -EIO; mutex_lock(&radio->lock); radio->buffer[0] = 0x00; radio->buffer[1] = 0x55; radio->buffer[2] = 0xaa; radio->buffer[3] = 0x03; radio->buffer[4] = AMRADIO_SET_FREQ; radio->buffer[5] = 0x00; radio->buffer[6] = 0x00; radio->buffer[7] = 0x08; retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2), (void *) (radio->buffer), BUFFER_LENGTH, &size, USB_TIMEOUT); if (retval < 0 || size != BUFFER_LENGTH) { mutex_unlock(&radio->lock); return retval; } /* frequency is calculated from freq_send and placed in first 2 bytes */ radio->buffer[0] = (freq_send >> 8) & 0xff; radio->buffer[1] = freq_send & 0xff; radio->buffer[2] = 0x01; radio->buffer[3] = 0x00; radio->buffer[4] = 0x00; /* 5 and 6 bytes of buffer already = 0x00 */ radio->buffer[7] = 0x00; retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2), (void *) (radio->buffer), BUFFER_LENGTH, &size, USB_TIMEOUT); if (retval < 0 || size != BUFFER_LENGTH) { mutex_unlock(&radio->lock); return retval; } mutex_unlock(&radio->lock); return retval; } static int amradio_set_stereo(struct amradio_device *radio, char argument) { int retval; int size; /* safety check */ if (radio->removed) return -EIO; mutex_lock(&radio->lock); radio->buffer[0] = 0x00; radio->buffer[1] = 0x55; radio->buffer[2] = 0xaa; radio->buffer[3] = 0x00; radio->buffer[4] = AMRADIO_SET_MONO; radio->buffer[5] = argument; radio->buffer[6] = 0x00; radio->buffer[7] = 0x00; retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2), (void *) (radio->buffer), BUFFER_LENGTH, &size, USB_TIMEOUT); if (retval < 0 || size != BUFFER_LENGTH) { radio->stereo = -1; mutex_unlock(&radio->lock); return retval; } radio->stereo = 1; mutex_unlock(&radio->lock); return retval; } /* Handle unplugging the device. * We call video_unregister_device in any case. * The last function called in this procedure is * usb_amradio_device_release. */ static void usb_amradio_disconnect(struct usb_interface *intf) { struct amradio_device *radio = usb_get_intfdata(intf); mutex_lock(&radio->lock); radio->removed = 1; mutex_unlock(&radio->lock); usb_set_intfdata(intf, NULL); video_unregister_device(radio->videodev); v4l2_device_disconnect(&radio->v4l2_dev); } /* vidioc_querycap - query device capabilities */ static int vidioc_querycap(struct file *file, void *priv, struct v4l2_capability *v) { struct amradio_device *radio = video_drvdata(file); strlcpy(v->driver, "radio-mr800", sizeof(v->driver)); strlcpy(v->card, "AverMedia MR 800 USB FM Radio", sizeof(v->card)); usb_make_path(radio->usbdev, v->bus_info, sizeof(v->bus_info)); v->version = RADIO_VERSION; v->capabilities = V4L2_CAP_TUNER; return 0; } /* vidioc_g_tuner - get tuner attributes */ static int vidioc_g_tuner(struct file *file, void *priv, struct v4l2_tuner *v) { struct amradio_device *radio = video_get_drvdata(video_devdata(file)); int retval; /* safety check */ if (radio->removed) return -EIO; if (v->index > 0) return -EINVAL; /* TODO: Add function which look is signal stereo or not * amradio_getstat(radio); */ /* we call amradio_set_stereo to set radio->stereo * Honestly, amradio_getstat should cover this in future and * amradio_set_stereo shouldn't be here */ retval = amradio_set_stereo(radio, WANT_STEREO); if (retval < 0) amradio_dev_warn(&radio->videodev->dev, "set stereo failed\n"); strcpy(v->name, "FM"); v->type = V4L2_TUNER_RADIO; v->rangelow = FREQ_MIN * FREQ_MUL; v->rangehigh = FREQ_MAX * FREQ_MUL; v->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO; v->capability = V4L2_TUNER_CAP_LOW; if (radio->stereo) v->audmode = V4L2_TUNER_MODE_STEREO; else v->audmode = V4L2_TUNER_MODE_MONO; v->signal = 0xffff; /* Can't get the signal strength, sad.. */ v->afc = 0; /* Don't know what is this */ return 0; } /* vidioc_s_tuner - set tuner attributes */ static int vidioc_s_tuner(struct file *file, void *priv, struct v4l2_tuner *v) { struct amradio_device *radio = video_get_drvdata(video_devdata(file)); int retval; /* safety check */ if (radio->removed) return -EIO; if (v->index > 0) return -EINVAL; /* mono/stereo selector */ switch (v->audmode) { case V4L2_TUNER_MODE_MONO: retval = amradio_set_stereo(radio, WANT_MONO); if (retval < 0) amradio_dev_warn(&radio->videodev->dev, "set mono failed\n"); break; case V4L2_TUNER_MODE_STEREO: retval = amradio_set_stereo(radio, WANT_STEREO); if (retval < 0) amradio_dev_warn(&radio->videodev->dev, "set stereo failed\n"); break; default: return -EINVAL; } return 0; } /* vidioc_s_frequency - set tuner radio frequency */ static int vidioc_s_frequency(struct file *file, void *priv, struct v4l2_frequency *f) { struct amradio_device *radio = video_get_drvdata(video_devdata(file)); int retval; /* safety check */ if (radio->removed) return -EIO; mutex_lock(&radio->lock); radio->curfreq = f->frequency; mutex_unlock(&radio->lock); retval = amradio_setfreq(radio, radio->curfreq); if (retval < 0) amradio_dev_warn(&radio->videodev->dev, "set frequency failed\n"); return 0; } /* vidioc_g_frequency - get tuner radio frequency */ static int vidioc_g_frequency(struct file *file, void *priv, struct v4l2_frequency *f) { struct amradio_device *radio = video_get_drvdata(video_devdata(file)); /* safety check */ if (radio->removed) return -EIO; f->type = V4L2_TUNER_RADIO; f->frequency = radio->curfreq; return 0; } /* vidioc_queryctrl - enumerate control items */ static int vidioc_queryctrl(struct file *file, void *priv, struct v4l2_queryctrl *qc) { switch (qc->id) { case V4L2_CID_AUDIO_MUTE: return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1); } return -EINVAL; } /* vidioc_g_ctrl - get the value of a control */ static int vidioc_g_ctrl(struct file *file, void *priv, struct v4l2_control *ctrl) { struct amradio_device *radio = video_get_drvdata(video_devdata(file)); /* safety check */ if (radio->removed) return -EIO; switch (ctrl->id) { case V4L2_CID_AUDIO_MUTE: ctrl->value = radio->muted; return 0; } return -EINVAL; } /* vidioc_s_ctrl - set the value of a control */ static int vidioc_s_ctrl(struct file *file, void *priv, struct v4l2_control *ctrl) { struct amradio_device *radio = video_get_drvdata(video_devdata(file)); int retval; /* safety check */ if (radio->removed) return -EIO; switch (ctrl->id) { case V4L2_CID_AUDIO_MUTE: if (ctrl->value) { retval = amradio_set_mute(radio, AMRADIO_STOP); if (retval < 0) { amradio_dev_warn(&radio->videodev->dev, "amradio_stop failed\n"); return -1; } } else { retval = amradio_set_mute(radio, AMRADIO_START); if (retval < 0) { amradio_dev_warn(&radio->videodev->dev, "amradio_start failed\n"); return -1; } } return 0; } return -EINVAL; } /* vidioc_g_audio - get audio attributes */ static int vidioc_g_audio(struct file *file, void *priv, struct v4l2_audio *a) { if (a->index > 1) return -EINVAL; strcpy(a->name, "Radio"); a->capability = V4L2_AUDCAP_STEREO; return 0; } /* vidioc_s_audio - set audio attributes */ static int vidioc_s_audio(struct file *file, void *priv, struct v4l2_audio *a) { if (a->index != 0) return -EINVAL; return 0; } /* vidioc_g_input - get input */ static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i) { *i = 0; return 0; } /* vidioc_s_input - set input */ static int vidioc_s_input(struct file *filp, void *priv, unsigned int i) { if (i != 0) return -EINVAL; return 0; } /* open device - amradio_start() and amradio_setfreq() */ static int usb_amradio_open(struct file *file) { struct amradio_device *radio = video_get_drvdata(video_devdata(file)); int retval; lock_kernel(); radio->users = 1; radio->muted = 1; retval = amradio_set_mute(radio, AMRADIO_START); if (retval < 0) { amradio_dev_warn(&radio->videodev->dev, "radio did not start up properly\n"); radio->users = 0; unlock_kernel(); return -EIO; } retval = amradio_set_stereo(radio, WANT_STEREO); if (retval < 0) amradio_dev_warn(&radio->videodev->dev, "set stereo failed\n"); retval = amradio_setfreq(radio, radio->curfreq); if (retval < 0) amradio_dev_warn(&radio->videodev->dev, "set frequency failed\n"); unlock_kernel(); return 0; } /*close device */ static int usb_amradio_close(struct file *file) { struct amradio_device *radio = video_get_drvdata(video_devdata(file)); int retval; if (!radio) return -ENODEV; mutex_lock(&radio->lock); radio->users = 0; mutex_unlock(&radio->lock); if (!radio->removed) { retval = amradio_set_mute(radio, AMRADIO_STOP); if (retval < 0) amradio_dev_warn(&radio->videodev->dev, "amradio_stop failed\n"); } return 0; } /* Suspend device - stop device. Need to be checked and fixed */ static int usb_amradio_suspend(struct usb_interface *intf, pm_message_t message) { struct amradio_device *radio = usb_get_intfdata(intf); int retval; retval = amradio_set_mute(radio, AMRADIO_STOP); if (retval < 0) dev_warn(&intf->dev, "amradio_stop failed\n"); dev_info(&intf->dev, "going into suspend..\n"); return 0; } /* Resume device - start device. Need to be checked and fixed */ static int usb_amradio_resume(struct usb_interface *intf) { struct amradio_device *radio = usb_get_intfdata(intf); int retval; retval = amradio_set_mute(radio, AMRADIO_START); if (retval < 0) dev_warn(&intf->dev, "amradio_start failed\n"); dev_info(&intf->dev, "coming out of suspend..\n"); return 0; } /* File system interface */ static const struct v4l2_file_operations usb_amradio_fops = { .owner = THIS_MODULE, .open = usb_amradio_open, .release = usb_amradio_close, .ioctl = video_ioctl2, }; static const struct v4l2_ioctl_ops usb_amradio_ioctl_ops = { .vidioc_querycap = vidioc_querycap, .vidioc_g_tuner = vidioc_g_tuner, .vidioc_s_tuner = vidioc_s_tuner, .vidioc_g_frequency = vidioc_g_frequency, .vidioc_s_frequency = vidioc_s_frequency, .vidioc_queryctrl = vidioc_queryctrl, .vidioc_g_ctrl = vidioc_g_ctrl, .vidioc_s_ctrl = vidioc_s_ctrl, .vidioc_g_audio = vidioc_g_audio, .vidioc_s_audio = vidioc_s_audio, .vidioc_g_input = vidioc_g_input, .vidioc_s_input = vidioc_s_input, }; static void usb_amradio_video_device_release(struct video_device *videodev) { struct amradio_device *radio = video_get_drvdata(videodev); /* we call v4l to free radio->videodev */ video_device_release(videodev); v4l2_device_unregister(&radio->v4l2_dev); /* free rest memory */ kfree(radio->buffer); kfree(radio); } /* check if the device is present and register with v4l and usb if it is */ static int usb_amradio_probe(struct usb_interface *intf, const struct usb_device_id *id) { struct amradio_device *radio; struct v4l2_device *v4l2_dev; int retval; radio = kzalloc(sizeof(struct amradio_device), GFP_KERNEL); if (!radio) { dev_err(&intf->dev, "kmalloc for amradio_device failed\n"); return -ENOMEM; } radio->buffer = kmalloc(BUFFER_LENGTH, GFP_KERNEL); if (!radio->buffer) { dev_err(&intf->dev, "kmalloc for radio->buffer failed\n"); kfree(radio); return -ENOMEM; } v4l2_dev = &radio->v4l2_dev; retval = v4l2_device_register(&intf->dev, v4l2_dev); if (retval < 0) { dev_err(&intf->dev, "couldn't register v4l2_device\n"); kfree(radio->buffer); kfree(radio); return retval; } radio->videodev = video_device_alloc(); if (!radio->videodev) { dev_err(&intf->dev, "video_device_alloc failed\n"); kfree(radio->buffer); kfree(radio); return -ENOMEM; } strlcpy(radio->videodev->name, v4l2_dev->name, sizeof(radio->videodev->name)); radio->videodev->v4l2_dev = v4l2_dev; radio->videodev->fops = &usb_amradio_fops; radio->videodev->ioctl_ops = &usb_amradio_ioctl_ops; radio->videodev->release = usb_amradio_video_device_release; radio->removed = 0; radio->users = 0; radio->usbdev = interface_to_usbdev(intf); radio->curfreq = 95.16 * FREQ_MUL; radio->stereo = -1; mutex_init(&radio->lock); video_set_drvdata(radio->videodev, radio); retval = video_register_device(radio->videodev, VFL_TYPE_RADIO, radio_nr); if (retval < 0) { dev_err(&intf->dev, "could not register video device\n"); video_device_release(radio->videodev); v4l2_device_unregister(v4l2_dev); kfree(radio->buffer); kfree(radio); return -EIO; } usb_set_intfdata(intf, radio); return 0; } static int __init amradio_init(void) { int retval = usb_register(&usb_amradio_driver); pr_info(KBUILD_MODNAME ": version " DRIVER_VERSION " " DRIVER_DESC "\n"); if (retval) pr_err(KBUILD_MODNAME ": usb_register failed. Error number %d\n", retval); return retval; } static void __exit amradio_exit(void) { usb_deregister(&usb_amradio_driver); } module_init(amradio_init); module_exit(amradio_exit);