diff options
Diffstat (limited to 'drivers/media/radio/radio-mr800.c')
| -rw-r--r-- | drivers/media/radio/radio-mr800.c | 614 |
1 files changed, 614 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..a360227 --- /dev/null +++ b/drivers/media/radio/radio-mr800.c @@ -0,0 +1,614 @@ +/* + * 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 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 <paravoid@debian.org> 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 <dougsland@gmail.com> and + * David Ellingsworth <david@identd.dyndns.org> + * 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 <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-device.h> +#include <media/v4l2-ioctl.h> +#include <media/v4l2-ctrls.h> +#include <media/v4l2-event.h> +#include <linux/usb.h> +#include <linux/mutex.h> + +/* 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 "0.1.2" + +MODULE_AUTHOR(DRIVER_AUTHOR); +MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_LICENSE("GPL"); +MODULE_VERSION(DRIVER_VERSION); + +#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) + +#define amradio_dev_err(dev, fmt, arg...) \ + dev_err(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 isn't full and will be updated with implementation of new functions + */ +#define AMRADIO_SET_FREQ 0xa4 +#define AMRADIO_GET_READY_FLAG 0xa5 +#define AMRADIO_GET_SIGNAL 0xa7 +#define AMRADIO_GET_FREQ 0xa8 +#define AMRADIO_SET_SEARCH_UP 0xa9 +#define AMRADIO_SET_SEARCH_DOWN 0xaa +#define AMRADIO_SET_MUTE 0xab +#define AMRADIO_SET_RIGHT_MUTE 0xac +#define AMRADIO_SET_LEFT_MUTE 0xad +#define AMRADIO_SET_MONO 0xae +#define AMRADIO_SET_SEARCH_LVL 0xb0 +#define AMRADIO_STOP_SEARCH 0xb1 + +/* 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"); + +/* Data for one (physical) device */ +struct amradio_device { + /* reference to USB and video device */ + struct usb_device *usbdev; + struct usb_interface *intf; + struct video_device vdev; + struct v4l2_device v4l2_dev; + struct v4l2_ctrl_handler hdl; + + u8 *buffer; + struct mutex lock; /* buffer locking */ + int curfreq; + int stereo; + int muted; +}; + +static inline struct amradio_device *to_amradio_dev(struct v4l2_device *v4l2_dev) +{ + return container_of(v4l2_dev, struct amradio_device, v4l2_dev); +} + +static int amradio_send_cmd(struct amradio_device *radio, u8 cmd, u8 arg, + u8 *extra, u8 extralen, bool reply) +{ + int retval; + int size; + + radio->buffer[0] = 0x00; + radio->buffer[1] = 0x55; + radio->buffer[2] = 0xaa; + radio->buffer[3] = extralen; + radio->buffer[4] = cmd; + radio->buffer[5] = arg; + radio->buffer[6] = 0x00; + radio->buffer[7] = extra || reply ? 8 : 0; + + retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2), + radio->buffer, BUFFER_LENGTH, &size, USB_TIMEOUT); + + if (retval < 0 || size != BUFFER_LENGTH) { + if (video_is_registered(&radio->vdev)) + amradio_dev_warn(&radio->vdev.dev, + "cmd %02x failed\n", cmd); + return retval ? retval : -EIO; + } + if (!extra && !reply) + return 0; + + if (extra) { + memcpy(radio->buffer, extra, extralen); + memset(radio->buffer + extralen, 0, 8 - extralen); + retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2), + radio->buffer, BUFFER_LENGTH, &size, USB_TIMEOUT); + } else { + memset(radio->buffer, 0, 8); + retval = usb_bulk_msg(radio->usbdev, usb_rcvbulkpipe(radio->usbdev, 0x81), + radio->buffer, BUFFER_LENGTH, &size, USB_TIMEOUT); + } + if (retval == 0 && size == BUFFER_LENGTH) + return 0; + if (video_is_registered(&radio->vdev) && cmd != AMRADIO_GET_READY_FLAG) + amradio_dev_warn(&radio->vdev.dev, "follow-up to cmd %02x failed\n", cmd); + return retval ? retval : -EIO; +} + +/* switch on/off the radio. Send 8 bytes to device */ +static int amradio_set_mute(struct amradio_device *radio, bool mute) +{ + int ret = amradio_send_cmd(radio, + AMRADIO_SET_MUTE, mute, NULL, 0, false); + + if (!ret) + radio->muted = mute; + return ret; +} + +/* set a frequency, freq is defined by v4l's TUNER_LOW, i.e. 1/16th kHz */ +static int amradio_set_freq(struct amradio_device *radio, int freq) +{ + unsigned short freq_send; + u8 buf[3]; + int retval; + + /* we need to be sure that frequency isn't out of range */ + freq = clamp_t(unsigned, freq, FREQ_MIN * FREQ_MUL, FREQ_MAX * FREQ_MUL); + freq_send = 0x10 + (freq >> 3) / 25; + + /* frequency is calculated from freq_send and placed in first 2 bytes */ + buf[0] = (freq_send >> 8) & 0xff; + buf[1] = freq_send & 0xff; + buf[2] = 0x01; + + retval = amradio_send_cmd(radio, AMRADIO_SET_FREQ, 0, buf, 3, false); + if (retval) + return retval; + radio->curfreq = freq; + msleep(40); + return 0; +} + +static int amradio_set_stereo(struct amradio_device *radio, bool stereo) +{ + int ret = amradio_send_cmd(radio, + AMRADIO_SET_MONO, !stereo, NULL, 0, false); + + if (!ret) + radio->stereo = stereo; + return ret; +} + +static int amradio_get_stat(struct amradio_device *radio, bool *is_stereo, u32 *signal) +{ + int ret = amradio_send_cmd(radio, + AMRADIO_GET_SIGNAL, 0, NULL, 0, true); + + if (ret) + return ret; + *is_stereo = radio->buffer[2] >> 7; + *signal = (radio->buffer[3] & 0xf0) << 8; + return 0; +} + +/* 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 = to_amradio_dev(usb_get_intfdata(intf)); + + mutex_lock(&radio->lock); + video_unregister_device(&radio->vdev); + amradio_set_mute(radio, true); + usb_set_intfdata(intf, NULL); + v4l2_device_disconnect(&radio->v4l2_dev); + mutex_unlock(&radio->lock); + v4l2_device_put(&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->device_caps = V4L2_CAP_RADIO | V4L2_CAP_TUNER | + V4L2_CAP_HW_FREQ_SEEK; + v->capabilities = v->device_caps | V4L2_CAP_DEVICE_CAPS; + 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_drvdata(file); + bool is_stereo = false; + int retval; + + if (v->index > 0) + return -EINVAL; + + v->signal = 0; + retval = amradio_get_stat(radio, &is_stereo, &v->signal); + if (retval) + return retval; + + strcpy(v->name, "FM"); + v->type = V4L2_TUNER_RADIO; + v->rangelow = FREQ_MIN * FREQ_MUL; + v->rangehigh = FREQ_MAX * FREQ_MUL; + v->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO | + V4L2_TUNER_CAP_HWSEEK_WRAP; + v->rxsubchans = is_stereo ? V4L2_TUNER_SUB_STEREO : V4L2_TUNER_SUB_MONO; + v->audmode = radio->stereo ? + V4L2_TUNER_MODE_STEREO : V4L2_TUNER_MODE_MONO; + return 0; +} + +/* vidioc_s_tuner - set tuner attributes */ +static int vidioc_s_tuner(struct file *file, void *priv, + const struct v4l2_tuner *v) +{ + struct amradio_device *radio = video_drvdata(file); + + if (v->index > 0) + return -EINVAL; + + /* mono/stereo selector */ + switch (v->audmode) { + case V4L2_TUNER_MODE_MONO: + return amradio_set_stereo(radio, WANT_MONO); + default: + return amradio_set_stereo(radio, WANT_STEREO); + } +} + +/* vidioc_s_frequency - set tuner radio frequency */ +static int vidioc_s_frequency(struct file *file, void *priv, + const struct v4l2_frequency *f) +{ + struct amradio_device *radio = video_drvdata(file); + + if (f->tuner != 0) + return -EINVAL; + return amradio_set_freq(radio, f->frequency); +} + +/* 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_drvdata(file); + + if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO) + return -EINVAL; + f->type = V4L2_TUNER_RADIO; + f->frequency = radio->curfreq; + + return 0; +} + +static int vidioc_s_hw_freq_seek(struct file *file, void *priv, + const struct v4l2_hw_freq_seek *seek) +{ + static u8 buf[8] = { + 0x3d, 0x32, 0x0f, 0x08, 0x3d, 0x32, 0x0f, 0x08 + }; + struct amradio_device *radio = video_drvdata(file); + unsigned long timeout; + int retval; + + if (seek->tuner != 0 || !seek->wrap_around) + return -EINVAL; + + if (file->f_flags & O_NONBLOCK) + return -EWOULDBLOCK; + + retval = amradio_send_cmd(radio, + AMRADIO_SET_SEARCH_LVL, 0, buf, 8, false); + if (retval) + return retval; + amradio_set_freq(radio, radio->curfreq); + retval = amradio_send_cmd(radio, + seek->seek_upward ? AMRADIO_SET_SEARCH_UP : AMRADIO_SET_SEARCH_DOWN, + 0, NULL, 0, false); + if (retval) + return retval; + timeout = jiffies + msecs_to_jiffies(30000); + for (;;) { + if (time_after(jiffies, timeout)) { + retval = -ENODATA; + break; + } + if (schedule_timeout_interruptible(msecs_to_jiffies(10))) { + retval = -ERESTARTSYS; + break; + } + retval = amradio_send_cmd(radio, AMRADIO_GET_READY_FLAG, + 0, NULL, 0, true); + if (retval) + continue; + amradio_send_cmd(radio, AMRADIO_GET_FREQ, 0, NULL, 0, true); + if (radio->buffer[1] || radio->buffer[2]) { + /* To check: sometimes radio->curfreq is set to out of range value */ + radio->curfreq = (radio->buffer[1] << 8) | radio->buffer[2]; + radio->curfreq = (radio->curfreq - 0x10) * 200; + amradio_send_cmd(radio, AMRADIO_STOP_SEARCH, + 0, NULL, 0, false); + amradio_set_freq(radio, radio->curfreq); + retval = 0; + break; + } + } + amradio_send_cmd(radio, AMRADIO_STOP_SEARCH, 0, NULL, 0, false); + amradio_set_freq(radio, radio->curfreq); + return retval; +} + +static int usb_amradio_s_ctrl(struct v4l2_ctrl *ctrl) +{ + struct amradio_device *radio = + container_of(ctrl->handler, struct amradio_device, hdl); + + switch (ctrl->id) { + case V4L2_CID_AUDIO_MUTE: + return amradio_set_mute(radio, ctrl->val); + } + + return -EINVAL; +} + +static int usb_amradio_init(struct amradio_device *radio) +{ + int retval; + + retval = amradio_set_mute(radio, true); + if (retval) + goto out_err; + retval = amradio_set_stereo(radio, true); + if (retval) + goto out_err; + retval = amradio_set_freq(radio, radio->curfreq); + if (retval) + goto out_err; + return 0; + +out_err: + amradio_dev_err(&radio->vdev.dev, "initialization failed\n"); + return retval; +} + +/* 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 = to_amradio_dev(usb_get_intfdata(intf)); + + mutex_lock(&radio->lock); + if (!radio->muted) { + amradio_set_mute(radio, true); + radio->muted = false; + } + mutex_unlock(&radio->lock); + + 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 = to_amradio_dev(usb_get_intfdata(intf)); + + mutex_lock(&radio->lock); + amradio_set_stereo(radio, radio->stereo); + amradio_set_freq(radio, radio->curfreq); + + if (!radio->muted) + amradio_set_mute(radio, false); + + mutex_unlock(&radio->lock); + + dev_info(&intf->dev, "coming out of suspend..\n"); + return 0; +} + +static const struct v4l2_ctrl_ops usb_amradio_ctrl_ops = { + .s_ctrl = usb_amradio_s_ctrl, +}; + +/* File system interface */ +static const struct v4l2_file_operations usb_amradio_fops = { + .owner = THIS_MODULE, + .open = v4l2_fh_open, + .release = v4l2_fh_release, + .poll = v4l2_ctrl_poll, + .unlocked_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_s_hw_freq_seek = vidioc_s_hw_freq_seek, + .vidioc_log_status = v4l2_ctrl_log_status, + .vidioc_subscribe_event = v4l2_ctrl_subscribe_event, + .vidioc_unsubscribe_event = v4l2_event_unsubscribe, +}; + +static void usb_amradio_release(struct v4l2_device *v4l2_dev) +{ + struct amradio_device *radio = to_amradio_dev(v4l2_dev); + + /* free rest memory */ + v4l2_ctrl_handler_free(&radio->hdl); + v4l2_device_unregister(&radio->v4l2_dev); + 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; + int retval = 0; + + radio = kzalloc(sizeof(struct amradio_device), GFP_KERNEL); + + if (!radio) { + dev_err(&intf->dev, "kmalloc for amradio_device failed\n"); + retval = -ENOMEM; + goto err; + } + + radio->buffer = kmalloc(BUFFER_LENGTH, GFP_KERNEL); + + if (!radio->buffer) { + dev_err(&intf->dev, "kmalloc for radio->buffer failed\n"); + retval = -ENOMEM; + goto err_nobuf; + } + + retval = v4l2_device_register(&intf->dev, &radio->v4l2_dev); + if (retval < 0) { + dev_err(&intf->dev, "couldn't register v4l2_device\n"); + goto err_v4l2; + } + + v4l2_ctrl_handler_init(&radio->hdl, 1); + v4l2_ctrl_new_std(&radio->hdl, &usb_amradio_ctrl_ops, + V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1); + if (radio->hdl.error) { + retval = radio->hdl.error; + dev_err(&intf->dev, "couldn't register control\n"); + goto err_ctrl; + } + mutex_init(&radio->lock); + + radio->v4l2_dev.ctrl_handler = &radio->hdl; + radio->v4l2_dev.release = usb_amradio_release; + strlcpy(radio->vdev.name, radio->v4l2_dev.name, + sizeof(radio->vdev.name)); + radio->vdev.v4l2_dev = &radio->v4l2_dev; + radio->vdev.fops = &usb_amradio_fops; + radio->vdev.ioctl_ops = &usb_amradio_ioctl_ops; + radio->vdev.release = video_device_release_empty; + radio->vdev.lock = &radio->lock; + set_bit(V4L2_FL_USE_FH_PRIO, &radio->vdev.flags); + + radio->usbdev = interface_to_usbdev(intf); + radio->intf = intf; + usb_set_intfdata(intf, &radio->v4l2_dev); + radio->curfreq = 95.16 * FREQ_MUL; + + video_set_drvdata(&radio->vdev, radio); + retval = usb_amradio_init(radio); + if (retval) + goto err_vdev; + + retval = video_register_device(&radio->vdev, VFL_TYPE_RADIO, + radio_nr); + if (retval < 0) { + dev_err(&intf->dev, "could not register video device\n"); + goto err_vdev; + } + + return 0; + +err_vdev: + v4l2_ctrl_handler_free(&radio->hdl); +err_ctrl: + v4l2_device_unregister(&radio->v4l2_dev); +err_v4l2: + kfree(radio->buffer); +err_nobuf: + kfree(radio); +err: + return retval; +} + +/* 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, +}; + +module_usb_driver(usb_amradio_driver); |