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405 lines
11 KiB
405 lines
11 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (c) 2012 Hans Verkuil <[email protected]> |
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*/ |
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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 <[email protected]>"); |
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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 const 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 transmit 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 ? 0 : 1) | (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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strscpy(v->driver, "radio-keene", sizeof(v->driver)); |
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strscpy(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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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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strscpy(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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const 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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const struct v4l2_frequency *f) |
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{ |
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struct keene_device *radio = video_drvdata(file); |
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unsigned freq = f->frequency; |
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if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO) |
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return -EINVAL; |
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freq = clamp(freq, FREQ_MIN * FREQ_MUL, FREQ_MAX * FREQ_MUL); |
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return keene_cmd_main(radio, freq, 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 - (s32)ctrl->minimum) / (s32)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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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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strscpy(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->vdev.vfl_dir = VFL_DIR_TX; |
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radio->vdev.device_caps = V4L2_CAP_RADIO | V4L2_CAP_MODULATOR; |
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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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/* at least 11ms is needed in order to settle hardware */ |
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msleep(20); |
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keene_cmd_main(radio, 95.16 * FREQ_MUL, false); |
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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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module_usb_driver(usb_keene_driver); |
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