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![Hans de Goede](/assets/img/avatar_default.png)
Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
433 lines
12 KiB
C
433 lines
12 KiB
C
/*
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* Copyright (c) 2012 Hans Verkuil <hverkuil@xs4all.nl>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/* kernel includes */
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/input.h>
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#include <linux/videodev2.h>
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#include <media/v4l2-device.h>
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#include <media/v4l2-ioctl.h>
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#include <media/v4l2-ctrls.h>
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#include <media/v4l2-event.h>
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#include <linux/usb.h>
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#include <linux/mutex.h>
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/* driver and module definitions */
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MODULE_AUTHOR("Hans Verkuil <hverkuil@xs4all.nl>");
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MODULE_DESCRIPTION("Keene FM Transmitter driver");
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MODULE_LICENSE("GPL");
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/* Actually, it advertises itself as a Logitech */
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#define USB_KEENE_VENDOR 0x046d
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#define USB_KEENE_PRODUCT 0x0a0e
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/* Probably USB_TIMEOUT should be modified in module parameter */
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#define BUFFER_LENGTH 8
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#define USB_TIMEOUT 500
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/* Frequency limits in MHz */
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#define FREQ_MIN 76U
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#define FREQ_MAX 108U
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#define FREQ_MUL 16000U
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/* USB Device ID List */
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static struct usb_device_id usb_keene_device_table[] = {
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{USB_DEVICE_AND_INTERFACE_INFO(USB_KEENE_VENDOR, USB_KEENE_PRODUCT,
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USB_CLASS_HID, 0, 0) },
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{ } /* Terminating entry */
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};
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MODULE_DEVICE_TABLE(usb, usb_keene_device_table);
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struct keene_device {
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struct usb_device *usbdev;
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struct usb_interface *intf;
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struct video_device vdev;
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struct v4l2_device v4l2_dev;
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struct v4l2_ctrl_handler hdl;
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struct mutex lock;
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u8 *buffer;
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unsigned curfreq;
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u8 tx;
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u8 pa;
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bool stereo;
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bool muted;
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bool preemph_75_us;
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};
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static inline struct keene_device *to_keene_dev(struct v4l2_device *v4l2_dev)
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{
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return container_of(v4l2_dev, struct keene_device, v4l2_dev);
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}
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/* Set frequency (if non-0), PA, mute and turn on/off the FM transmitter. */
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static int keene_cmd_main(struct keene_device *radio, unsigned freq, bool play)
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{
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unsigned short freq_send = freq ? (freq - 76 * 16000) / 800 : 0;
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int ret;
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radio->buffer[0] = 0x00;
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radio->buffer[1] = 0x50;
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radio->buffer[2] = (freq_send >> 8) & 0xff;
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radio->buffer[3] = freq_send & 0xff;
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radio->buffer[4] = radio->pa;
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/* If bit 4 is set, then tune to the frequency.
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If bit 3 is set, then unmute; if bit 2 is set, then mute.
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If bit 1 is set, then enter idle mode; if bit 0 is set,
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then enter transit mode.
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*/
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radio->buffer[5] = (radio->muted ? 4 : 8) | (play ? 1 : 2) |
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(freq ? 0x10 : 0);
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radio->buffer[6] = 0x00;
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radio->buffer[7] = 0x00;
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ret = usb_control_msg(radio->usbdev, usb_sndctrlpipe(radio->usbdev, 0),
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9, 0x21, 0x200, 2, radio->buffer, BUFFER_LENGTH, USB_TIMEOUT);
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if (ret < 0) {
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dev_warn(&radio->vdev.dev, "%s failed (%d)\n", __func__, ret);
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return ret;
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}
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if (freq)
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radio->curfreq = freq;
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return 0;
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}
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/* Set TX, stereo and preemphasis mode (50 us vs 75 us). */
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static int keene_cmd_set(struct keene_device *radio)
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{
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int ret;
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radio->buffer[0] = 0x00;
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radio->buffer[1] = 0x51;
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radio->buffer[2] = radio->tx;
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/* If bit 0 is set, then transmit mono, otherwise stereo.
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If bit 2 is set, then enable 75 us preemphasis, otherwise
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it is 50 us. */
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radio->buffer[3] = (!radio->stereo) | (radio->preemph_75_us ? 4 : 0);
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radio->buffer[4] = 0x00;
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radio->buffer[5] = 0x00;
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radio->buffer[6] = 0x00;
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radio->buffer[7] = 0x00;
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ret = usb_control_msg(radio->usbdev, usb_sndctrlpipe(radio->usbdev, 0),
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9, 0x21, 0x200, 2, radio->buffer, BUFFER_LENGTH, USB_TIMEOUT);
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if (ret < 0) {
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dev_warn(&radio->vdev.dev, "%s failed (%d)\n", __func__, ret);
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return ret;
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}
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return 0;
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}
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/* Handle unplugging the device.
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* We call video_unregister_device in any case.
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* The last function called in this procedure is
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* usb_keene_device_release.
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*/
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static void usb_keene_disconnect(struct usb_interface *intf)
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{
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struct keene_device *radio = to_keene_dev(usb_get_intfdata(intf));
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mutex_lock(&radio->lock);
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usb_set_intfdata(intf, NULL);
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video_unregister_device(&radio->vdev);
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v4l2_device_disconnect(&radio->v4l2_dev);
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mutex_unlock(&radio->lock);
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v4l2_device_put(&radio->v4l2_dev);
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}
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static int usb_keene_suspend(struct usb_interface *intf, pm_message_t message)
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{
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struct keene_device *radio = to_keene_dev(usb_get_intfdata(intf));
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return keene_cmd_main(radio, 0, false);
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}
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static int usb_keene_resume(struct usb_interface *intf)
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{
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struct keene_device *radio = to_keene_dev(usb_get_intfdata(intf));
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mdelay(50);
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keene_cmd_set(radio);
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keene_cmd_main(radio, radio->curfreq, true);
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return 0;
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}
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static int vidioc_querycap(struct file *file, void *priv,
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struct v4l2_capability *v)
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{
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struct keene_device *radio = video_drvdata(file);
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strlcpy(v->driver, "radio-keene", sizeof(v->driver));
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strlcpy(v->card, "Keene FM Transmitter", sizeof(v->card));
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usb_make_path(radio->usbdev, v->bus_info, sizeof(v->bus_info));
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v->device_caps = V4L2_CAP_RADIO | V4L2_CAP_MODULATOR;
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v->capabilities = v->device_caps | V4L2_CAP_DEVICE_CAPS;
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return 0;
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}
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static int vidioc_g_modulator(struct file *file, void *priv,
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struct v4l2_modulator *v)
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{
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struct keene_device *radio = video_drvdata(file);
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if (v->index > 0)
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return -EINVAL;
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strlcpy(v->name, "FM", sizeof(v->name));
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v->rangelow = FREQ_MIN * FREQ_MUL;
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v->rangehigh = FREQ_MAX * FREQ_MUL;
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v->txsubchans = radio->stereo ? V4L2_TUNER_SUB_STEREO : V4L2_TUNER_SUB_MONO;
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v->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO;
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return 0;
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}
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static int vidioc_s_modulator(struct file *file, void *priv,
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struct v4l2_modulator *v)
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{
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struct keene_device *radio = video_drvdata(file);
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if (v->index > 0)
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return -EINVAL;
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radio->stereo = (v->txsubchans == V4L2_TUNER_SUB_STEREO);
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return keene_cmd_set(radio);
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}
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static int vidioc_s_frequency(struct file *file, void *priv,
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struct v4l2_frequency *f)
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{
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struct keene_device *radio = video_drvdata(file);
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if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
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return -EINVAL;
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f->frequency = clamp(f->frequency,
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FREQ_MIN * FREQ_MUL, FREQ_MAX * FREQ_MUL);
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return keene_cmd_main(radio, f->frequency, true);
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}
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static int vidioc_g_frequency(struct file *file, void *priv,
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struct v4l2_frequency *f)
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{
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struct keene_device *radio = video_drvdata(file);
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if (f->tuner != 0)
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return -EINVAL;
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f->type = V4L2_TUNER_RADIO;
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f->frequency = radio->curfreq;
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return 0;
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}
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static int keene_s_ctrl(struct v4l2_ctrl *ctrl)
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{
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static const u8 db2tx[] = {
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/* -15, -12, -9, -6, -3, 0 dB */
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0x03, 0x13, 0x02, 0x12, 0x22, 0x32,
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/* 3, 6, 9, 12, 15, 18 dB */
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0x21, 0x31, 0x20, 0x30, 0x40, 0x50
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};
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struct keene_device *radio =
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container_of(ctrl->handler, struct keene_device, hdl);
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switch (ctrl->id) {
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case V4L2_CID_AUDIO_MUTE:
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radio->muted = ctrl->val;
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return keene_cmd_main(radio, 0, true);
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case V4L2_CID_TUNE_POWER_LEVEL:
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/* To go from dBuV to the register value we apply the
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following formula: */
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radio->pa = (ctrl->val - 71) * 100 / 62;
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return keene_cmd_main(radio, 0, true);
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case V4L2_CID_TUNE_PREEMPHASIS:
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radio->preemph_75_us = ctrl->val == V4L2_PREEMPHASIS_75_uS;
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return keene_cmd_set(radio);
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case V4L2_CID_AUDIO_COMPRESSION_GAIN:
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radio->tx = db2tx[(ctrl->val - ctrl->minimum) / ctrl->step];
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return keene_cmd_set(radio);
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}
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return -EINVAL;
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}
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/* File system interface */
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static const struct v4l2_file_operations usb_keene_fops = {
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.owner = THIS_MODULE,
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.open = v4l2_fh_open,
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.release = v4l2_fh_release,
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.poll = v4l2_ctrl_poll,
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.unlocked_ioctl = video_ioctl2,
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};
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static const struct v4l2_ctrl_ops keene_ctrl_ops = {
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.s_ctrl = keene_s_ctrl,
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};
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static const struct v4l2_ioctl_ops usb_keene_ioctl_ops = {
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.vidioc_querycap = vidioc_querycap,
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.vidioc_g_modulator = vidioc_g_modulator,
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.vidioc_s_modulator = vidioc_s_modulator,
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.vidioc_g_frequency = vidioc_g_frequency,
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.vidioc_s_frequency = vidioc_s_frequency,
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.vidioc_log_status = v4l2_ctrl_log_status,
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.vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
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.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
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};
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static void usb_keene_video_device_release(struct v4l2_device *v4l2_dev)
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{
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struct keene_device *radio = to_keene_dev(v4l2_dev);
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/* free rest memory */
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v4l2_ctrl_handler_free(&radio->hdl);
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kfree(radio->buffer);
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kfree(radio);
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}
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/* check if the device is present and register with v4l and usb if it is */
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static int usb_keene_probe(struct usb_interface *intf,
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const struct usb_device_id *id)
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{
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struct usb_device *dev = interface_to_usbdev(intf);
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struct keene_device *radio;
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struct v4l2_ctrl_handler *hdl;
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int retval = 0;
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/*
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* The Keene FM transmitter USB device has the same USB ID as
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* the Logitech AudioHub Speaker, but it should ignore the hid.
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* Check if the name is that of the Keene device.
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* If not, then someone connected the AudioHub and we shouldn't
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* attempt to handle this driver.
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* For reference: the product name of the AudioHub is
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* "AudioHub Speaker".
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*/
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if (dev->product && strcmp(dev->product, "B-LINK USB Audio "))
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return -ENODEV;
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radio = kzalloc(sizeof(struct keene_device), GFP_KERNEL);
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if (radio)
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radio->buffer = kmalloc(BUFFER_LENGTH, GFP_KERNEL);
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if (!radio || !radio->buffer) {
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dev_err(&intf->dev, "kmalloc for keene_device failed\n");
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kfree(radio);
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retval = -ENOMEM;
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goto err;
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}
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hdl = &radio->hdl;
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v4l2_ctrl_handler_init(hdl, 4);
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v4l2_ctrl_new_std(hdl, &keene_ctrl_ops, V4L2_CID_AUDIO_MUTE,
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0, 1, 1, 0);
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v4l2_ctrl_new_std_menu(hdl, &keene_ctrl_ops, V4L2_CID_TUNE_PREEMPHASIS,
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V4L2_PREEMPHASIS_75_uS, 1, V4L2_PREEMPHASIS_50_uS);
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v4l2_ctrl_new_std(hdl, &keene_ctrl_ops, V4L2_CID_TUNE_POWER_LEVEL,
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84, 118, 1, 118);
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v4l2_ctrl_new_std(hdl, &keene_ctrl_ops, V4L2_CID_AUDIO_COMPRESSION_GAIN,
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-15, 18, 3, 0);
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radio->pa = 118;
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radio->tx = 0x32;
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radio->stereo = true;
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radio->curfreq = 95.16 * FREQ_MUL;
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if (hdl->error) {
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retval = hdl->error;
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v4l2_ctrl_handler_free(hdl);
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goto err_v4l2;
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}
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retval = v4l2_device_register(&intf->dev, &radio->v4l2_dev);
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if (retval < 0) {
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dev_err(&intf->dev, "couldn't register v4l2_device\n");
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goto err_v4l2;
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}
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mutex_init(&radio->lock);
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radio->v4l2_dev.ctrl_handler = hdl;
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radio->v4l2_dev.release = usb_keene_video_device_release;
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strlcpy(radio->vdev.name, radio->v4l2_dev.name,
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sizeof(radio->vdev.name));
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radio->vdev.v4l2_dev = &radio->v4l2_dev;
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radio->vdev.fops = &usb_keene_fops;
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radio->vdev.ioctl_ops = &usb_keene_ioctl_ops;
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radio->vdev.lock = &radio->lock;
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radio->vdev.release = video_device_release_empty;
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radio->usbdev = interface_to_usbdev(intf);
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radio->intf = intf;
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usb_set_intfdata(intf, &radio->v4l2_dev);
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video_set_drvdata(&radio->vdev, radio);
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set_bit(V4L2_FL_USE_FH_PRIO, &radio->vdev.flags);
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retval = video_register_device(&radio->vdev, VFL_TYPE_RADIO, -1);
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if (retval < 0) {
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dev_err(&intf->dev, "could not register video device\n");
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goto err_vdev;
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}
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v4l2_ctrl_handler_setup(hdl);
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dev_info(&intf->dev, "V4L2 device registered as %s\n",
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video_device_node_name(&radio->vdev));
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return 0;
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err_vdev:
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v4l2_device_unregister(&radio->v4l2_dev);
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err_v4l2:
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kfree(radio->buffer);
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kfree(radio);
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err:
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return retval;
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}
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/* USB subsystem interface */
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static struct usb_driver usb_keene_driver = {
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.name = "radio-keene",
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.probe = usb_keene_probe,
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.disconnect = usb_keene_disconnect,
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.id_table = usb_keene_device_table,
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.suspend = usb_keene_suspend,
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.resume = usb_keene_resume,
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.reset_resume = usb_keene_resume,
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};
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static int __init keene_init(void)
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{
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int retval = usb_register(&usb_keene_driver);
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if (retval)
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pr_err(KBUILD_MODNAME
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": usb_register failed. Error number %d\n", retval);
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return retval;
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}
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static void __exit keene_exit(void)
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{
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usb_deregister(&usb_keene_driver);
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}
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module_init(keene_init);
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module_exit(keene_exit);
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