| /* |
| * Copyright (c) 2012 Hans Verkuil <hverkuil@xs4all.nl> |
| * |
| * 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 |
| */ |
| |
| /* 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 */ |
| MODULE_AUTHOR("Hans Verkuil <hverkuil@xs4all.nl>"); |
| MODULE_DESCRIPTION("Keene FM Transmitter driver"); |
| MODULE_LICENSE("GPL"); |
| |
| /* Actually, it advertises itself as a Logitech */ |
| #define USB_KEENE_VENDOR 0x046d |
| #define USB_KEENE_PRODUCT 0x0a0e |
| |
| /* Probably USB_TIMEOUT should be modified in module parameter */ |
| #define BUFFER_LENGTH 8 |
| #define USB_TIMEOUT 500 |
| |
| /* Frequency limits in MHz */ |
| #define FREQ_MIN 76U |
| #define FREQ_MAX 108U |
| #define FREQ_MUL 16000U |
| |
| /* USB Device ID List */ |
| static struct usb_device_id usb_keene_device_table[] = { |
| {USB_DEVICE_AND_INTERFACE_INFO(USB_KEENE_VENDOR, USB_KEENE_PRODUCT, |
| USB_CLASS_HID, 0, 0) }, |
| { } /* Terminating entry */ |
| }; |
| |
| MODULE_DEVICE_TABLE(usb, usb_keene_device_table); |
| |
| struct keene_device { |
| struct usb_device *usbdev; |
| struct usb_interface *intf; |
| struct video_device vdev; |
| struct v4l2_device v4l2_dev; |
| struct v4l2_ctrl_handler hdl; |
| struct mutex lock; |
| |
| u8 *buffer; |
| unsigned curfreq; |
| u8 tx; |
| u8 pa; |
| bool stereo; |
| bool muted; |
| bool preemph_75_us; |
| }; |
| |
| static inline struct keene_device *to_keene_dev(struct v4l2_device *v4l2_dev) |
| { |
| return container_of(v4l2_dev, struct keene_device, v4l2_dev); |
| } |
| |
| /* Set frequency (if non-0), PA, mute and turn on/off the FM transmitter. */ |
| static int keene_cmd_main(struct keene_device *radio, unsigned freq, bool play) |
| { |
| unsigned short freq_send = freq ? (freq - 76 * 16000) / 800 : 0; |
| int ret; |
| |
| radio->buffer[0] = 0x00; |
| radio->buffer[1] = 0x50; |
| radio->buffer[2] = (freq_send >> 8) & 0xff; |
| radio->buffer[3] = freq_send & 0xff; |
| radio->buffer[4] = radio->pa; |
| /* If bit 4 is set, then tune to the frequency. |
| If bit 3 is set, then unmute; if bit 2 is set, then mute. |
| If bit 1 is set, then enter idle mode; if bit 0 is set, |
| then enter transit mode. |
| */ |
| radio->buffer[5] = (radio->muted ? 4 : 8) | (play ? 1 : 2) | |
| (freq ? 0x10 : 0); |
| radio->buffer[6] = 0x00; |
| radio->buffer[7] = 0x00; |
| |
| ret = usb_control_msg(radio->usbdev, usb_sndctrlpipe(radio->usbdev, 0), |
| 9, 0x21, 0x200, 2, radio->buffer, BUFFER_LENGTH, USB_TIMEOUT); |
| |
| if (ret < 0) { |
| dev_warn(&radio->vdev.dev, "%s failed (%d)\n", __func__, ret); |
| return ret; |
| } |
| if (freq) |
| radio->curfreq = freq; |
| return 0; |
| } |
| |
| /* Set TX, stereo and preemphasis mode (50 us vs 75 us). */ |
| static int keene_cmd_set(struct keene_device *radio) |
| { |
| int ret; |
| |
| radio->buffer[0] = 0x00; |
| radio->buffer[1] = 0x51; |
| radio->buffer[2] = radio->tx; |
| /* If bit 0 is set, then transmit mono, otherwise stereo. |
| If bit 2 is set, then enable 75 us preemphasis, otherwise |
| it is 50 us. */ |
| radio->buffer[3] = (!radio->stereo) | (radio->preemph_75_us ? 4 : 0); |
| radio->buffer[4] = 0x00; |
| radio->buffer[5] = 0x00; |
| radio->buffer[6] = 0x00; |
| radio->buffer[7] = 0x00; |
| |
| ret = usb_control_msg(radio->usbdev, usb_sndctrlpipe(radio->usbdev, 0), |
| 9, 0x21, 0x200, 2, radio->buffer, BUFFER_LENGTH, USB_TIMEOUT); |
| |
| if (ret < 0) { |
| dev_warn(&radio->vdev.dev, "%s failed (%d)\n", __func__, ret); |
| return ret; |
| } |
| return 0; |
| } |
| |
| /* Handle unplugging the device. |
| * We call video_unregister_device in any case. |
| * The last function called in this procedure is |
| * usb_keene_device_release. |
| */ |
| static void usb_keene_disconnect(struct usb_interface *intf) |
| { |
| struct keene_device *radio = to_keene_dev(usb_get_intfdata(intf)); |
| |
| v4l2_device_get(&radio->v4l2_dev); |
| mutex_lock(&radio->lock); |
| usb_set_intfdata(intf, NULL); |
| video_unregister_device(&radio->vdev); |
| v4l2_device_disconnect(&radio->v4l2_dev); |
| mutex_unlock(&radio->lock); |
| v4l2_device_put(&radio->v4l2_dev); |
| } |
| |
| static int vidioc_querycap(struct file *file, void *priv, |
| struct v4l2_capability *v) |
| { |
| struct keene_device *radio = video_drvdata(file); |
| |
| strlcpy(v->driver, "radio-keene", sizeof(v->driver)); |
| strlcpy(v->card, "Keene FM Transmitter", sizeof(v->card)); |
| usb_make_path(radio->usbdev, v->bus_info, sizeof(v->bus_info)); |
| v->device_caps = V4L2_CAP_RADIO | V4L2_CAP_MODULATOR; |
| v->capabilities = v->device_caps | V4L2_CAP_DEVICE_CAPS; |
| return 0; |
| } |
| |
| static int vidioc_g_modulator(struct file *file, void *priv, |
| struct v4l2_modulator *v) |
| { |
| struct keene_device *radio = video_drvdata(file); |
| |
| if (v->index > 0) |
| return -EINVAL; |
| |
| strlcpy(v->name, "FM", sizeof(v->name)); |
| v->rangelow = FREQ_MIN * FREQ_MUL; |
| v->rangehigh = FREQ_MAX * FREQ_MUL; |
| v->txsubchans = radio->stereo ? V4L2_TUNER_SUB_STEREO : V4L2_TUNER_SUB_MONO; |
| v->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO; |
| return 0; |
| } |
| |
| static int vidioc_s_modulator(struct file *file, void *priv, |
| struct v4l2_modulator *v) |
| { |
| struct keene_device *radio = video_drvdata(file); |
| |
| if (v->index > 0) |
| return -EINVAL; |
| |
| radio->stereo = (v->txsubchans == V4L2_TUNER_SUB_STEREO); |
| return keene_cmd_set(radio); |
| } |
| |
| static int vidioc_s_frequency(struct file *file, void *priv, |
| struct v4l2_frequency *f) |
| { |
| struct keene_device *radio = video_drvdata(file); |
| |
| if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO) |
| return -EINVAL; |
| f->frequency = clamp(f->frequency, |
| FREQ_MIN * FREQ_MUL, FREQ_MAX * FREQ_MUL); |
| return keene_cmd_main(radio, f->frequency, true); |
| } |
| |
| static int vidioc_g_frequency(struct file *file, void *priv, |
| struct v4l2_frequency *f) |
| { |
| struct keene_device *radio = video_drvdata(file); |
| |
| if (f->tuner != 0) |
| return -EINVAL; |
| f->type = V4L2_TUNER_RADIO; |
| f->frequency = radio->curfreq; |
| return 0; |
| } |
| |
| static int keene_s_ctrl(struct v4l2_ctrl *ctrl) |
| { |
| static const u8 db2tx[] = { |
| /* -15, -12, -9, -6, -3, 0 dB */ |
| 0x03, 0x13, 0x02, 0x12, 0x22, 0x32, |
| /* 3, 6, 9, 12, 15, 18 dB */ |
| 0x21, 0x31, 0x20, 0x30, 0x40, 0x50 |
| }; |
| struct keene_device *radio = |
| container_of(ctrl->handler, struct keene_device, hdl); |
| |
| switch (ctrl->id) { |
| case V4L2_CID_AUDIO_MUTE: |
| radio->muted = ctrl->val; |
| return keene_cmd_main(radio, 0, true); |
| |
| case V4L2_CID_TUNE_POWER_LEVEL: |
| /* To go from dBuV to the register value we apply the |
| following formula: */ |
| radio->pa = (ctrl->val - 71) * 100 / 62; |
| return keene_cmd_main(radio, 0, true); |
| |
| case V4L2_CID_TUNE_PREEMPHASIS: |
| radio->preemph_75_us = ctrl->val == V4L2_PREEMPHASIS_75_uS; |
| return keene_cmd_set(radio); |
| |
| case V4L2_CID_AUDIO_COMPRESSION_GAIN: |
| radio->tx = db2tx[(ctrl->val - ctrl->minimum) / ctrl->step]; |
| return keene_cmd_set(radio); |
| } |
| return -EINVAL; |
| } |
| |
| static int vidioc_subscribe_event(struct v4l2_fh *fh, |
| struct v4l2_event_subscription *sub) |
| { |
| switch (sub->type) { |
| case V4L2_EVENT_CTRL: |
| return v4l2_event_subscribe(fh, sub, 0); |
| default: |
| return -EINVAL; |
| } |
| } |
| |
| |
| /* File system interface */ |
| static const struct v4l2_file_operations usb_keene_fops = { |
| .owner = THIS_MODULE, |
| .open = v4l2_fh_open, |
| .release = v4l2_fh_release, |
| .poll = v4l2_ctrl_poll, |
| .unlocked_ioctl = video_ioctl2, |
| }; |
| |
| static const struct v4l2_ctrl_ops keene_ctrl_ops = { |
| .s_ctrl = keene_s_ctrl, |
| }; |
| |
| static const struct v4l2_ioctl_ops usb_keene_ioctl_ops = { |
| .vidioc_querycap = vidioc_querycap, |
| .vidioc_g_modulator = vidioc_g_modulator, |
| .vidioc_s_modulator = vidioc_s_modulator, |
| .vidioc_g_frequency = vidioc_g_frequency, |
| .vidioc_s_frequency = vidioc_s_frequency, |
| .vidioc_log_status = v4l2_ctrl_log_status, |
| .vidioc_subscribe_event = vidioc_subscribe_event, |
| .vidioc_unsubscribe_event = v4l2_event_unsubscribe, |
| }; |
| |
| static void usb_keene_video_device_release(struct v4l2_device *v4l2_dev) |
| { |
| struct keene_device *radio = to_keene_dev(v4l2_dev); |
| |
| /* free rest memory */ |
| v4l2_ctrl_handler_free(&radio->hdl); |
| kfree(radio->buffer); |
| kfree(radio); |
| } |
| |
| /* check if the device is present and register with v4l and usb if it is */ |
| static int usb_keene_probe(struct usb_interface *intf, |
| const struct usb_device_id *id) |
| { |
| struct usb_device *dev = interface_to_usbdev(intf); |
| struct keene_device *radio; |
| struct v4l2_ctrl_handler *hdl; |
| int retval = 0; |
| |
| /* |
| * The Keene FM transmitter USB device has the same USB ID as |
| * the Logitech AudioHub Speaker, but it should ignore the hid. |
| * Check if the name is that of the Keene device. |
| * If not, then someone connected the AudioHub and we shouldn't |
| * attempt to handle this driver. |
| * For reference: the product name of the AudioHub is |
| * "AudioHub Speaker". |
| */ |
| if (dev->product && strcmp(dev->product, "B-LINK USB Audio ")) |
| return -ENODEV; |
| |
| radio = kzalloc(sizeof(struct keene_device), GFP_KERNEL); |
| if (radio) |
| radio->buffer = kmalloc(BUFFER_LENGTH, GFP_KERNEL); |
| |
| if (!radio || !radio->buffer) { |
| dev_err(&intf->dev, "kmalloc for keene_device failed\n"); |
| kfree(radio); |
| retval = -ENOMEM; |
| goto err; |
| } |
| |
| hdl = &radio->hdl; |
| v4l2_ctrl_handler_init(hdl, 4); |
| v4l2_ctrl_new_std(hdl, &keene_ctrl_ops, V4L2_CID_AUDIO_MUTE, |
| 0, 1, 1, 0); |
| v4l2_ctrl_new_std_menu(hdl, &keene_ctrl_ops, V4L2_CID_TUNE_PREEMPHASIS, |
| V4L2_PREEMPHASIS_75_uS, 1, V4L2_PREEMPHASIS_50_uS); |
| v4l2_ctrl_new_std(hdl, &keene_ctrl_ops, V4L2_CID_TUNE_POWER_LEVEL, |
| 84, 118, 1, 118); |
| v4l2_ctrl_new_std(hdl, &keene_ctrl_ops, V4L2_CID_AUDIO_COMPRESSION_GAIN, |
| -15, 18, 3, 0); |
| radio->pa = 118; |
| radio->tx = 0x32; |
| radio->stereo = true; |
| radio->curfreq = 95.16 * FREQ_MUL; |
| if (hdl->error) { |
| retval = hdl->error; |
| |
| v4l2_ctrl_handler_free(hdl); |
| goto err_v4l2; |
| } |
| 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; |
| } |
| |
| mutex_init(&radio->lock); |
| |
| radio->v4l2_dev.ctrl_handler = hdl; |
| radio->v4l2_dev.release = usb_keene_video_device_release; |
| strlcpy(radio->vdev.name, radio->v4l2_dev.name, |
| sizeof(radio->vdev.name)); |
| radio->vdev.v4l2_dev = &radio->v4l2_dev; |
| radio->vdev.fops = &usb_keene_fops; |
| radio->vdev.ioctl_ops = &usb_keene_ioctl_ops; |
| radio->vdev.lock = &radio->lock; |
| radio->vdev.release = video_device_release_empty; |
| |
| radio->usbdev = interface_to_usbdev(intf); |
| radio->intf = intf; |
| usb_set_intfdata(intf, &radio->v4l2_dev); |
| |
| video_set_drvdata(&radio->vdev, radio); |
| set_bit(V4L2_FL_USE_FH_PRIO, &radio->vdev.flags); |
| |
| retval = video_register_device(&radio->vdev, VFL_TYPE_RADIO, -1); |
| if (retval < 0) { |
| dev_err(&intf->dev, "could not register video device\n"); |
| goto err_vdev; |
| } |
| v4l2_ctrl_handler_setup(hdl); |
| dev_info(&intf->dev, "V4L2 device registered as %s\n", |
| video_device_node_name(&radio->vdev)); |
| return 0; |
| |
| err_vdev: |
| v4l2_device_unregister(&radio->v4l2_dev); |
| err_v4l2: |
| kfree(radio->buffer); |
| kfree(radio); |
| err: |
| return retval; |
| } |
| |
| /* USB subsystem interface */ |
| static struct usb_driver usb_keene_driver = { |
| .name = "radio-keene", |
| .probe = usb_keene_probe, |
| .disconnect = usb_keene_disconnect, |
| .id_table = usb_keene_device_table, |
| }; |
| |
| static int __init keene_init(void) |
| { |
| int retval = usb_register(&usb_keene_driver); |
| |
| if (retval) |
| pr_err(KBUILD_MODNAME |
| ": usb_register failed. Error number %d\n", retval); |
| |
| return retval; |
| } |
| |
| static void __exit keene_exit(void) |
| { |
| usb_deregister(&usb_keene_driver); |
| } |
| |
| module_init(keene_init); |
| module_exit(keene_exit); |
| |