diff options
Diffstat (limited to 'drivers/media/radio/radio-mr800.c')
| -rw-r--r-- | drivers/media/radio/radio-mr800.c | 633 |
1 files changed, 633 insertions, 0 deletions
diff --git a/drivers/media/radio/radio-mr800.c b/drivers/media/radio/radio-mr800.c new file mode 100644 index 0000000..256cbef --- /dev/null +++ b/drivers/media/radio/radio-mr800.c @@ -0,0 +1,633 @@ +/* + * 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 <klimov.linux@gmail.com> + * + * 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 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 trough using their + * achievements (specifications given). + * So, we have smth to begin with. + * + * History: + * Version 0.01: First working version. + * It's required to blacklist AverMedia USB Radio + * in usbhid/hid-quirks.c + * + * Many things to do: + * - Correct power managment of device (suspend & resume) + * - Make x86 independance (little-endian and big-endian stuff) + * - Add code for scanning and smooth tuning + * - Checked and add stereo&mono stuff + * - Add code for sensitivity value + * - Correct mistakes + * - In Japan another FREQ_MIN and FREQ_MAX + */ + +/* kernel includes */ +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/input.h> +#include <linux/videodev2.h> +#include <media/v4l2-common.h> +#include <media/v4l2-ioctl.h> +#include <linux/usb.h> +#include <linux/version.h> /* for KERNEL_VERSION MACRO */ + +/* driver and module definitions */ +#define DRIVER_AUTHOR "Alexey Klimov <klimov.linux@gmail.com>" +#define DRIVER_DESC "AverMedia MR 800 USB FM radio driver" +#define DRIVER_VERSION "0.01" +#define RADIO_VERSION KERNEL_VERSION(0, 0, 1) + +MODULE_AUTHOR(DRIVER_AUTHOR); +MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_LICENSE("GPL"); + +#define USB_AMRADIO_VENDOR 0x07ca +#define USB_AMRADIO_PRODUCT 0xb800 + +/* 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 + +/* module parameter */ +static int radio_nr = -1; +module_param(radio_nr, int, 0); +MODULE_PARM_DESC(radio_nr, "Radio Nr"); + +static struct v4l2_queryctrl radio_qctrl[] = { + { + .id = V4L2_CID_AUDIO_MUTE, + .name = "Mute", + .minimum = 0, + .maximum = 1, + .step = 1, + .default_value = 1, + .type = V4L2_CTRL_TYPE_BOOLEAN, + }, +/* HINT: the disabled controls are only here to satify kradio and such apps */ + { .id = V4L2_CID_AUDIO_VOLUME, + .flags = V4L2_CTRL_FLAG_DISABLED, + }, + { + .id = V4L2_CID_AUDIO_BALANCE, + .flags = V4L2_CTRL_FLAG_DISABLED, + }, + { + .id = V4L2_CID_AUDIO_BASS, + .flags = V4L2_CTRL_FLAG_DISABLED, + }, + { + .id = V4L2_CID_AUDIO_TREBLE, + .flags = V4L2_CTRL_FLAG_DISABLED, + }, + { + .id = V4L2_CID_AUDIO_LOUDNESS, + .flags = V4L2_CTRL_FLAG_DISABLED, + }, +}; + +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 inode *inode, struct file *file); +static int usb_amradio_close(struct inode *inode, 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; + + 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 = "radio-mr800", + .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 = 1, +}; + +/* switch on radio. Send 8 bytes to device. */ +static int amradio_start(struct amradio_device *radio) +{ + int retval; + int size; + + mutex_lock(&radio->lock); + + radio->buffer[0] = 0x00; + radio->buffer[1] = 0x55; + radio->buffer[2] = 0xaa; + radio->buffer[3] = 0x00; + radio->buffer[4] = 0xab; + radio->buffer[5] = 0x00; + 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) { + mutex_unlock(&radio->lock); + return retval; + } + + mutex_unlock(&radio->lock); + + radio->muted = 0; + + return retval; +} + +/* switch off radio */ +static int amradio_stop(struct amradio_device *radio) +{ + int retval; + int size; + + mutex_lock(&radio->lock); + + radio->buffer[0] = 0x00; + radio->buffer[1] = 0x55; + radio->buffer[2] = 0xaa; + radio->buffer[3] = 0x00; + radio->buffer[4] = 0xab; + radio->buffer[5] = 0x01; + 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) { + mutex_unlock(&radio->lock); + return retval; + } + + mutex_unlock(&radio->lock); + + radio->muted = 1; + + 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 = 0x13 + (freq >> 3) / 25; + + mutex_lock(&radio->lock); + + radio->buffer[0] = 0x00; + radio->buffer[1] = 0x55; + radio->buffer[2] = 0xaa; + radio->buffer[3] = 0x03; + radio->buffer[4] = 0xa4; + 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) { + 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) { + mutex_unlock(&radio->lock); + return retval; + } + + mutex_unlock(&radio->lock); + + radio->stereo = 0; + + return retval; +} + +/* USB subsystem interface begins here */ + +/* handle unplugging of the device, release data structures +if nothing keeps us from doing it. If something is still +keeping us busy, the release callback of v4l will take care +of releasing it. */ +static void usb_amradio_disconnect(struct usb_interface *intf) +{ + struct amradio_device *radio = usb_get_intfdata(intf); + + usb_set_intfdata(intf, NULL); + + if (radio) { + video_unregister_device(radio->videodev); + radio->videodev = NULL; + if (radio->users) { + kfree(radio->buffer); + kfree(radio); + } else { + radio->removed = 1; + } + } +} + +/* vidioc_querycap - query device capabilities */ +static int vidioc_querycap(struct file *file, void *priv, + struct v4l2_capability *v) +{ + strlcpy(v->driver, "radio-mr800", sizeof(v->driver)); + strlcpy(v->card, "AverMedia MR 800 USB FM Radio", sizeof(v->card)); + sprintf(v->bus_info, "USB"); + 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)); + + if (v->index > 0) + return -EINVAL; + +/* TODO: Add function which look is signal stereo or not + * amradio_getstat(radio); + */ + radio->stereo = -1; + 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) +{ + if (v->index > 0) + 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)); + + radio->curfreq = f->frequency; + if (amradio_setfreq(radio, radio->curfreq) < 0) + warn("Set frequency failed"); + 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)); + + 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) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) { + if (qc->id && qc->id == radio_qctrl[i].id) { + memcpy(qc, &(radio_qctrl[i]), + sizeof(*qc)); + return 0; + } + } + 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)); + + 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)); + + switch (ctrl->id) { + case V4L2_CID_AUDIO_MUTE: + if (ctrl->value) { + if (amradio_stop(radio) < 0) { + warn("amradio_stop() failed"); + return -1; + } + } else { + if (amradio_start(radio) < 0) { + warn("amradio_start() failed"); + 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 inode *inode, struct file *file) +{ + struct amradio_device *radio = video_get_drvdata(video_devdata(file)); + + lock_kernel(); + + radio->users = 1; + radio->muted = 1; + + if (amradio_start(radio) < 0) { + warn("Radio did not start up properly"); + radio->users = 0; + unlock_kernel(); + return -EIO; + } + if (amradio_setfreq(radio, radio->curfreq) < 0) + warn("Set frequency failed"); + + unlock_kernel(); + return 0; +} + +/*close device - free driver structures */ +static int usb_amradio_close(struct inode *inode, struct file *file) +{ + struct amradio_device *radio = video_get_drvdata(video_devdata(file)); + + if (!radio) + return -ENODEV; + radio->users = 0; + if (radio->removed) { + kfree(radio->buffer); + kfree(radio); + } + 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); + + if (amradio_stop(radio) < 0) + warn("amradio_stop() failed"); + + info("radio-mr800: Going into suspend.."); + + 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); + + if (amradio_start(radio) < 0) + warn("amradio_start() failed"); + + info("radio-mr800: Coming out of suspend.."); + + return 0; +} + +/* File system interface */ +static const struct file_operations usb_amradio_fops = { + .owner = THIS_MODULE, + .open = usb_amradio_open, + .release = usb_amradio_close, + .ioctl = video_ioctl2, +#ifdef CONFIG_COMPAT + .compat_ioctl = v4l_compat_ioctl32, +#endif + .llseek = no_llseek, +}; + +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, +}; + +/* V4L2 interface */ +static struct video_device amradio_videodev_template = { + .name = "AverMedia MR 800 USB FM Radio", + .fops = &usb_amradio_fops, + .ioctl_ops = &usb_amradio_ioctl_ops, + .release = video_device_release, +}; + +/* 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; + + radio = kmalloc(sizeof(struct amradio_device), GFP_KERNEL); + + if (!(radio)) + return -ENOMEM; + + radio->buffer = kmalloc(BUFFER_LENGTH, GFP_KERNEL); + + if (!(radio->buffer)) { + kfree(radio); + return -ENOMEM; + } + + radio->videodev = video_device_alloc(); + + if (!(radio->videodev)) { + kfree(radio->buffer); + kfree(radio); + return -ENOMEM; + } + + memcpy(radio->videodev, &amradio_videodev_template, + sizeof(amradio_videodev_template)); + + radio->removed = 0; + radio->users = 0; + radio->usbdev = interface_to_usbdev(intf); + radio->curfreq = 95.16 * FREQ_MUL; + + mutex_init(&radio->lock); + + video_set_drvdata(radio->videodev, radio); + if (video_register_device(radio->videodev, VFL_TYPE_RADIO, radio_nr)) { + warn("Could not register video device"); + video_device_release(radio->videodev); + 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); + + info(DRIVER_VERSION " " DRIVER_DESC); + if (retval) + err("usb_register failed. Error number %d", retval); + return retval; +} + +static void __exit amradio_exit(void) +{ + usb_deregister(&usb_amradio_driver); +} + +module_init(amradio_init); +module_exit(amradio_exit); + |
