--- /dev/null
+/*
+ * Copyright 2013 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
+ *
+ * This program is free software; you may redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/input.h>
+#include <linux/usb.h>
+#include <linux/hid.h>
+#include <linux/mutex.h>
+#include <linux/videodev2.h>
+#include <asm/unaligned.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-ioctl.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-event.h>
+
+/*
+ * 'Thanko's Raremono' is a Japanese si4734-based AM/FM/SW USB receiver:
+ *
+ * http://www.raremono.jp/product/484.html/
+ *
+ * The USB protocol has been reversed engineered using wireshark, initially
+ * by Dinesh Ram <dinesh.ram@cern.ch> and finished by Hans Verkuil
+ * <hverkuil@xs4all.nl>.
+ *
+ * Sadly the firmware used in this product hides lots of goodies since the
+ * si4734 has more features than are supported by the firmware. Oh well...
+ */
+
+/* driver and module definitions */
+MODULE_AUTHOR("Hans Verkuil <hverkuil@xs4all.nl>");
+MODULE_DESCRIPTION("Thanko's Raremono AM/FM/SW Receiver USB driver");
+MODULE_LICENSE("GPL v2");
+
+/*
+ * The Device announces itself as Cygnal Integrated Products, Inc.
+ *
+ * The vendor and product IDs (and in fact all other lsusb information as
+ * well) are identical to the si470x Silicon Labs USB FM Radio Reference
+ * Design board, even though this card has a si4734 device. Clearly the
+ * designer of this product never bothered to change the USB IDs.
+ */
+
+/* USB Device ID List */
+static struct usb_device_id usb_raremono_device_table[] = {
+ {USB_DEVICE_AND_INTERFACE_INFO(0x10c4, 0x818a, USB_CLASS_HID, 0, 0) },
+ { } /* Terminating entry */
+};
+
+MODULE_DEVICE_TABLE(usb, usb_raremono_device_table);
+
+#define BUFFER_LENGTH 64
+
+/* Timeout is set to a high value, could probably be reduced. Need more tests */
+#define USB_TIMEOUT 10000
+
+/* Frequency limits in KHz */
+#define FM_FREQ_RANGE_LOW 64000
+#define FM_FREQ_RANGE_HIGH 108000
+
+#define AM_FREQ_RANGE_LOW 520
+#define AM_FREQ_RANGE_HIGH 1710
+
+#define SW_FREQ_RANGE_LOW 2300
+#define SW_FREQ_RANGE_HIGH 26100
+
+enum { BAND_FM, BAND_AM, BAND_SW };
+
+static const struct v4l2_frequency_band bands[] = {
+ /* Band FM */
+ {
+ .type = V4L2_TUNER_RADIO,
+ .index = 0,
+ .capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
+ V4L2_TUNER_CAP_FREQ_BANDS,
+ .rangelow = FM_FREQ_RANGE_LOW * 16,
+ .rangehigh = FM_FREQ_RANGE_HIGH * 16,
+ .modulation = V4L2_BAND_MODULATION_FM,
+ },
+ /* Band AM */
+ {
+ .type = V4L2_TUNER_RADIO,
+ .index = 1,
+ .capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_FREQ_BANDS,
+ .rangelow = AM_FREQ_RANGE_LOW * 16,
+ .rangehigh = AM_FREQ_RANGE_HIGH * 16,
+ .modulation = V4L2_BAND_MODULATION_AM,
+ },
+ /* Band SW */
+ {
+ .type = V4L2_TUNER_RADIO,
+ .index = 2,
+ .capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_FREQ_BANDS,
+ .rangelow = SW_FREQ_RANGE_LOW * 16,
+ .rangehigh = SW_FREQ_RANGE_HIGH * 16,
+ .modulation = V4L2_BAND_MODULATION_AM,
+ },
+};
+
+struct raremono_device {
+ struct usb_device *usbdev;
+ struct usb_interface *intf;
+ struct video_device vdev;
+ struct v4l2_device v4l2_dev;
+ struct mutex lock;
+
+ u8 *buffer;
+ u32 band;
+ unsigned curfreq;
+};
+
+static inline struct raremono_device *to_raremono_dev(struct v4l2_device *v4l2_dev)
+{
+ return container_of(v4l2_dev, struct raremono_device, v4l2_dev);
+}
+
+/* Set frequency. */
+static int raremono_cmd_main(struct raremono_device *radio, unsigned band, unsigned freq)
+{
+ unsigned band_offset;
+ int ret;
+
+ switch (band) {
+ case BAND_FM:
+ band_offset = 1;
+ freq /= 10;
+ break;
+ case BAND_AM:
+ band_offset = 0;
+ break;
+ default:
+ band_offset = 2;
+ break;
+ }
+ radio->buffer[0] = 0x04 + band_offset;
+ radio->buffer[1] = freq >> 8;
+ radio->buffer[2] = freq & 0xff;
+
+ ret = usb_control_msg(radio->usbdev, usb_sndctrlpipe(radio->usbdev, 0),
+ HID_REQ_SET_REPORT,
+ USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT,
+ 0x0300 + radio->buffer[0], 2,
+ radio->buffer, 3, USB_TIMEOUT);
+
+ if (ret < 0) {
+ dev_warn(radio->v4l2_dev.dev, "%s failed (%d)\n", __func__, ret);
+ return ret;
+ }
+ radio->curfreq = (band == BAND_FM) ? freq * 10 : freq;
+ return 0;
+}
+
+/* Handle unplugging the device.
+ * We call video_unregister_device in any case.
+ * The last function called in this procedure is
+ * usb_raremono_device_release.
+ */
+static void usb_raremono_disconnect(struct usb_interface *intf)
+{
+ struct raremono_device *radio = to_raremono_dev(usb_get_intfdata(intf));
+
+ dev_info(&intf->dev, "Thanko's Raremono disconnected\n");
+
+ 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);
+}
+
+/*
+ * Linux Video interface
+ */
+static int vidioc_querycap(struct file *file, void *priv,
+ struct v4l2_capability *v)
+{
+ struct raremono_device *radio = video_drvdata(file);
+
+ strlcpy(v->driver, "radio-raremono", sizeof(v->driver));
+ strlcpy(v->card, "Thanko's Raremono", sizeof(v->card));
+ usb_make_path(radio->usbdev, v->bus_info, sizeof(v->bus_info));
+ v->device_caps = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
+ v->capabilities = v->device_caps | V4L2_CAP_DEVICE_CAPS;
+ return 0;
+}
+
+static int vidioc_enum_freq_bands(struct file *file, void *priv,
+ struct v4l2_frequency_band *band)
+{
+ if (band->tuner != 0)
+ return -EINVAL;
+
+ if (band->index >= ARRAY_SIZE(bands))
+ return -EINVAL;
+
+ *band = bands[band->index];
+
+ return 0;
+}
+
+static int vidioc_g_tuner(struct file *file, void *priv,
+ struct v4l2_tuner *v)
+{
+ struct raremono_device *radio = video_drvdata(file);
+ int ret;
+
+ if (v->index > 0)
+ return -EINVAL;
+
+ strlcpy(v->name, "AM/FM/SW", sizeof(v->name));
+ v->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
+ V4L2_TUNER_CAP_FREQ_BANDS;
+ v->rangelow = AM_FREQ_RANGE_LOW * 16;
+ v->rangehigh = FM_FREQ_RANGE_HIGH * 16;
+ v->rxsubchans = V4L2_TUNER_SUB_STEREO | V4L2_TUNER_SUB_MONO;
+ v->audmode = (radio->curfreq < FM_FREQ_RANGE_LOW) ?
+ V4L2_TUNER_MODE_MONO : V4L2_TUNER_MODE_STEREO;
+ memset(radio->buffer, 1, BUFFER_LENGTH);
+ ret = usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
+ 1, 0xa1, 0x030d, 2, radio->buffer, BUFFER_LENGTH, USB_TIMEOUT);
+
+ if (ret < 0) {
+ dev_warn(radio->v4l2_dev.dev, "%s failed (%d)\n", __func__, ret);
+ return ret;
+ }
+ v->signal = ((radio->buffer[1] & 0xf) << 8 | radio->buffer[2]) << 4;
+ return 0;
+}
+
+static int vidioc_s_tuner(struct file *file, void *priv,
+ const struct v4l2_tuner *v)
+{
+ return v->index ? -EINVAL : 0;
+}
+
+static int vidioc_s_frequency(struct file *file, void *priv,
+ const struct v4l2_frequency *f)
+{
+ struct raremono_device *radio = video_drvdata(file);
+ u32 freq = f->frequency;
+ unsigned band;
+
+ if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
+ return -EINVAL;
+
+ if (f->frequency >= (FM_FREQ_RANGE_LOW + SW_FREQ_RANGE_HIGH) * 8)
+ band = BAND_FM;
+ else if (f->frequency <= (AM_FREQ_RANGE_HIGH + SW_FREQ_RANGE_LOW) * 8)
+ band = BAND_AM;
+ else
+ band = BAND_SW;
+
+ freq = clamp_t(u32, f->frequency, bands[band].rangelow, bands[band].rangehigh);
+ return raremono_cmd_main(radio, band, freq / 16);
+}
+
+static int vidioc_g_frequency(struct file *file, void *priv,
+ struct v4l2_frequency *f)
+{
+ struct raremono_device *radio = video_drvdata(file);
+
+ if (f->tuner != 0)
+ return -EINVAL;
+ f->type = V4L2_TUNER_RADIO;
+ f->frequency = radio->curfreq * 16;
+ return 0;
+}
+
+/* File system interface */
+static const struct v4l2_file_operations usb_raremono_fops = {
+ .owner = THIS_MODULE,
+ .open = v4l2_fh_open,
+ .release = v4l2_fh_release,
+ .unlocked_ioctl = video_ioctl2,
+};
+
+static const struct v4l2_ioctl_ops usb_raremono_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_enum_freq_bands = vidioc_enum_freq_bands,
+};
+
+/* check if the device is present and register with v4l and usb if it is */
+static int usb_raremono_probe(struct usb_interface *intf,
+ const struct usb_device_id *id)
+{
+ struct raremono_device *radio;
+ int retval = 0;
+
+ radio = devm_kzalloc(&intf->dev, sizeof(struct raremono_device), GFP_KERNEL);
+ if (radio)
+ radio->buffer = devm_kmalloc(&intf->dev, BUFFER_LENGTH, GFP_KERNEL);
+
+ if (!radio || !radio->buffer)
+ return -ENOMEM;
+
+ radio->usbdev = interface_to_usbdev(intf);
+ radio->intf = intf;
+
+ /*
+ * This device uses the same USB IDs as the si470x SiLabs reference
+ * design. So do an additional check: attempt to read the device ID
+ * from the si470x: the lower 12 bits are 0x0242 for the si470x. The
+ * Raremono always returns 0x0800 (the meaning of that is unknown, but
+ * at least it works).
+ *
+ * We use this check to determine which device we are dealing with.
+ */
+ msleep(20);
+ retval = usb_control_msg(radio->usbdev,
+ usb_rcvctrlpipe(radio->usbdev, 0),
+ HID_REQ_GET_REPORT,
+ USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
+ 1, 2,
+ radio->buffer, 3, 500);
+ if (retval != 3 ||
+ (get_unaligned_be16(&radio->buffer[1]) & 0xfff) == 0x0242) {
+ dev_info(&intf->dev, "this is not Thanko's Raremono.\n");
+ return -ENODEV;
+ }
+
+ dev_info(&intf->dev, "Thanko's Raremono connected: (%04X:%04X)\n",
+ id->idVendor, id->idProduct);
+
+ retval = v4l2_device_register(&intf->dev, &radio->v4l2_dev);
+ if (retval < 0) {
+ dev_err(&intf->dev, "couldn't register v4l2_device\n");
+ return retval;
+ }
+
+ mutex_init(&radio->lock);
+
+ strlcpy(radio->vdev.name, radio->v4l2_dev.name,
+ sizeof(radio->vdev.name));
+ radio->vdev.v4l2_dev = &radio->v4l2_dev;
+ radio->vdev.fops = &usb_raremono_fops;
+ radio->vdev.ioctl_ops = &usb_raremono_ioctl_ops;
+ radio->vdev.lock = &radio->lock;
+ radio->vdev.release = video_device_release_empty;
+
+ usb_set_intfdata(intf, &radio->v4l2_dev);
+
+ video_set_drvdata(&radio->vdev, radio);
+
+ raremono_cmd_main(radio, BAND_FM, 95160);
+
+ retval = video_register_device(&radio->vdev, VFL_TYPE_RADIO, -1);
+ if (retval == 0) {
+ dev_info(&intf->dev, "V4L2 device registered as %s\n",
+ video_device_node_name(&radio->vdev));
+ return 0;
+ }
+ dev_err(&intf->dev, "could not register video device\n");
+ v4l2_device_unregister(&radio->v4l2_dev);
+ return retval;
+}
+
+/* USB subsystem interface */
+static struct usb_driver usb_raremono_driver = {
+ .name = "radio-raremono",
+ .probe = usb_raremono_probe,
+ .disconnect = usb_raremono_disconnect,
+ .id_table = usb_raremono_device_table,
+};
+
+module_usb_driver(usb_raremono_driver);
Code Review / kvmfornfv.git / blobdiff