linux/drivers/media/radio/dsbr100.c
Mauro Carvalho Chehab 5800571960 Linux 5.2-rc4
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Merge tag 'v5.2-rc4' into media/master

There are some conflicts due to SPDX changes. We also have more
patches being merged via media tree touching them.

So, let's merge back from upstream and address those.

Linux 5.2-rc4

* tag 'v5.2-rc4': (767 commits)
  Linux 5.2-rc4
  MAINTAINERS: Karthikeyan Ramasubramanian is MIA
  i2c: xiic: Add max_read_len quirk
  lockref: Limit number of cmpxchg loop retries
  uaccess: add noop untagged_addr definition
  x86/insn-eval: Fix use-after-free access to LDT entry
  kbuild: use more portable 'command -v' for cc-cross-prefix
  s390/unwind: correct stack switching during unwind
  block, bfq: add weight symlink to the bfq.weight cgroup parameter
  cgroup: let a symlink too be created with a cftype file
  drm/nouveau/secboot/gp10[2467]: support newer FW to fix SEC2 failures on some boards
  drm/nouveau/secboot: enable loading of versioned LS PMU/SEC2 ACR msgqueue FW
  drm/nouveau/secboot: split out FW version-specific LS function pointers
  drm/nouveau/secboot: pass max supported FW version to LS load funcs
  drm/nouveau/core: support versioned firmware loading
  drm/nouveau/core: pass subdev into nvkm_firmware_get, rather than device
  block: free sched's request pool in blk_cleanup_queue
  pktgen: do not sleep with the thread lock held.
  net: mvpp2: Use strscpy to handle stat strings
  net: rds: fix memory leak in rds_ib_flush_mr_pool
  ...

Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
2019-06-11 12:09:28 -04:00

421 lines
12 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/* A driver for the D-Link DSB-R100 USB radio and Gemtek USB Radio 21.
* The device plugs into both the USB and an analog audio input, so this thing
* only deals with initialisation and frequency setting, the
* audio data has to be handled by a sound driver.
*
* Major issue: I can't find out where the device reports the signal
* strength, and indeed the windows software appearantly just looks
* at the stereo indicator as well. So, scanning will only find
* stereo stations. Sad, but I can't help it.
*
* Also, the windows program sends oodles of messages over to the
* device, and I couldn't figure out their meaning. My suspicion
* is that they don't have any:-)
*
* You might find some interesting stuff about this module at
* http://unimut.fsk.uni-heidelberg.de/unimut/demi/dsbr
*
* Fully tested with the Keene USB FM Transmitter and the v4l2-compliance tool.
*
* Copyright (c) 2000 Markus Demleitner <msdemlei@cl.uni-heidelberg.de>
*/
#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 <linux/usb.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-event.h>
/*
* Version Information
*/
MODULE_AUTHOR("Markus Demleitner <msdemlei@tucana.harvard.edu>");
MODULE_DESCRIPTION("D-Link DSB-R100 USB FM radio driver");
MODULE_LICENSE("GPL");
MODULE_VERSION("1.1.0");
#define DSB100_VENDOR 0x04b4
#define DSB100_PRODUCT 0x1002
/* Commands the device appears to understand */
#define DSB100_TUNE 1
#define DSB100_ONOFF 2
#define TB_LEN 16
/* 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
#define v4l2_dev_to_radio(d) container_of(d, struct dsbr100_device, v4l2_dev)
static int radio_nr = -1;
module_param(radio_nr, int, 0);
/* Data for one (physical) device */
struct dsbr100_device {
struct usb_device *usbdev;
struct video_device videodev;
struct v4l2_device v4l2_dev;
struct v4l2_ctrl_handler hdl;
u8 *transfer_buffer;
struct mutex v4l2_lock;
int curfreq;
bool stereo;
bool muted;
};
/* Low-level device interface begins here */
/* set a frequency, freq is defined by v4l's TUNER_LOW, i.e. 1/16th kHz */
static int dsbr100_setfreq(struct dsbr100_device *radio, unsigned freq)
{
unsigned f = (freq / 16 * 80) / 1000 + 856;
int retval = 0;
if (!radio->muted) {
retval = usb_control_msg(radio->usbdev,
usb_rcvctrlpipe(radio->usbdev, 0),
DSB100_TUNE,
USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
(f >> 8) & 0x00ff, f & 0xff,
radio->transfer_buffer, 8, 300);
if (retval >= 0)
mdelay(1);
}
if (retval >= 0) {
radio->curfreq = freq;
return 0;
}
dev_err(&radio->usbdev->dev,
"%s - usb_control_msg returned %i, request %i\n",
__func__, retval, DSB100_TUNE);
return retval;
}
/* switch on radio */
static int dsbr100_start(struct dsbr100_device *radio)
{
int retval = usb_control_msg(radio->usbdev,
usb_rcvctrlpipe(radio->usbdev, 0),
DSB100_ONOFF,
USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
0x01, 0x00, radio->transfer_buffer, 8, 300);
if (retval >= 0)
return dsbr100_setfreq(radio, radio->curfreq);
dev_err(&radio->usbdev->dev,
"%s - usb_control_msg returned %i, request %i\n",
__func__, retval, DSB100_ONOFF);
return retval;
}
/* switch off radio */
static int dsbr100_stop(struct dsbr100_device *radio)
{
int retval = usb_control_msg(radio->usbdev,
usb_rcvctrlpipe(radio->usbdev, 0),
DSB100_ONOFF,
USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
0x00, 0x00, radio->transfer_buffer, 8, 300);
if (retval >= 0)
return 0;
dev_err(&radio->usbdev->dev,
"%s - usb_control_msg returned %i, request %i\n",
__func__, retval, DSB100_ONOFF);
return retval;
}
/* return the device status. This is, in effect, just whether it
sees a stereo signal or not. Pity. */
static void dsbr100_getstat(struct dsbr100_device *radio)
{
int retval = usb_control_msg(radio->usbdev,
usb_rcvctrlpipe(radio->usbdev, 0),
USB_REQ_GET_STATUS,
USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
0x00, 0x24, radio->transfer_buffer, 8, 300);
if (retval < 0) {
radio->stereo = false;
dev_err(&radio->usbdev->dev,
"%s - usb_control_msg returned %i, request %i\n",
__func__, retval, USB_REQ_GET_STATUS);
} else {
radio->stereo = !(radio->transfer_buffer[0] & 0x01);
}
}
static int vidioc_querycap(struct file *file, void *priv,
struct v4l2_capability *v)
{
struct dsbr100_device *radio = video_drvdata(file);
strscpy(v->driver, "dsbr100", sizeof(v->driver));
strscpy(v->card, "D-Link R-100 USB FM Radio", sizeof(v->card));
usb_make_path(radio->usbdev, v->bus_info, sizeof(v->bus_info));
return 0;
}
static int vidioc_g_tuner(struct file *file, void *priv,
struct v4l2_tuner *v)
{
struct dsbr100_device *radio = video_drvdata(file);
if (v->index > 0)
return -EINVAL;
dsbr100_getstat(radio);
strscpy(v->name, "FM", sizeof(v->name));
v->type = V4L2_TUNER_RADIO;
v->rangelow = FREQ_MIN * FREQ_MUL;
v->rangehigh = FREQ_MAX * FREQ_MUL;
v->rxsubchans = radio->stereo ? V4L2_TUNER_SUB_STEREO :
V4L2_TUNER_SUB_MONO;
v->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO;
v->audmode = V4L2_TUNER_MODE_STEREO;
v->signal = radio->stereo ? 0xffff : 0; /* We can't get the signal strength */
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 dsbr100_device *radio = video_drvdata(file);
if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
return -EINVAL;
return dsbr100_setfreq(radio, clamp_t(unsigned, f->frequency,
FREQ_MIN * FREQ_MUL, FREQ_MAX * FREQ_MUL));
}
static int vidioc_g_frequency(struct file *file, void *priv,
struct v4l2_frequency *f)
{
struct dsbr100_device *radio = video_drvdata(file);
if (f->tuner)
return -EINVAL;
f->type = V4L2_TUNER_RADIO;
f->frequency = radio->curfreq;
return 0;
}
static int usb_dsbr100_s_ctrl(struct v4l2_ctrl *ctrl)
{
struct dsbr100_device *radio =
container_of(ctrl->handler, struct dsbr100_device, hdl);
switch (ctrl->id) {
case V4L2_CID_AUDIO_MUTE:
radio->muted = ctrl->val;
return radio->muted ? dsbr100_stop(radio) : dsbr100_start(radio);
}
return -EINVAL;
}
/* USB subsystem interface begins here */
/*
* Handle unplugging of the device.
* We call video_unregister_device in any case.
* The last function called in this procedure is
* usb_dsbr100_video_device_release
*/
static void usb_dsbr100_disconnect(struct usb_interface *intf)
{
struct dsbr100_device *radio = usb_get_intfdata(intf);
mutex_lock(&radio->v4l2_lock);
/*
* Disconnect is also called on unload, and in that case we need to
* mute the device. This call will silently fail if it is called
* after a physical disconnect.
*/
usb_control_msg(radio->usbdev,
usb_rcvctrlpipe(radio->usbdev, 0),
DSB100_ONOFF,
USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
0x00, 0x00, radio->transfer_buffer, 8, 300);
usb_set_intfdata(intf, NULL);
video_unregister_device(&radio->videodev);
v4l2_device_disconnect(&radio->v4l2_dev);
mutex_unlock(&radio->v4l2_lock);
v4l2_device_put(&radio->v4l2_dev);
}
/* Suspend device - stop device. */
static int usb_dsbr100_suspend(struct usb_interface *intf, pm_message_t message)
{
struct dsbr100_device *radio = usb_get_intfdata(intf);
mutex_lock(&radio->v4l2_lock);
if (!radio->muted && dsbr100_stop(radio) < 0)
dev_warn(&intf->dev, "dsbr100_stop failed\n");
mutex_unlock(&radio->v4l2_lock);
dev_info(&intf->dev, "going into suspend..\n");
return 0;
}
/* Resume device - start device. */
static int usb_dsbr100_resume(struct usb_interface *intf)
{
struct dsbr100_device *radio = usb_get_intfdata(intf);
mutex_lock(&radio->v4l2_lock);
if (!radio->muted && dsbr100_start(radio) < 0)
dev_warn(&intf->dev, "dsbr100_start failed\n");
mutex_unlock(&radio->v4l2_lock);
dev_info(&intf->dev, "coming out of suspend..\n");
return 0;
}
/* free data structures */
static void usb_dsbr100_release(struct v4l2_device *v4l2_dev)
{
struct dsbr100_device *radio = v4l2_dev_to_radio(v4l2_dev);
v4l2_ctrl_handler_free(&radio->hdl);
v4l2_device_unregister(&radio->v4l2_dev);
kfree(radio->transfer_buffer);
kfree(radio);
}
static const struct v4l2_ctrl_ops usb_dsbr100_ctrl_ops = {
.s_ctrl = usb_dsbr100_s_ctrl,
};
/* File system interface */
static const struct v4l2_file_operations usb_dsbr100_fops = {
.owner = THIS_MODULE,
.unlocked_ioctl = video_ioctl2,
.open = v4l2_fh_open,
.release = v4l2_fh_release,
.poll = v4l2_ctrl_poll,
};
static const struct v4l2_ioctl_ops usb_dsbr100_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_log_status = v4l2_ctrl_log_status,
.vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
};
/* check if the device is present and register with v4l and usb if it is */
static int usb_dsbr100_probe(struct usb_interface *intf,
const struct usb_device_id *id)
{
struct dsbr100_device *radio;
struct v4l2_device *v4l2_dev;
int retval;
radio = kzalloc(sizeof(struct dsbr100_device), GFP_KERNEL);
if (!radio)
return -ENOMEM;
radio->transfer_buffer = kmalloc(TB_LEN, GFP_KERNEL);
if (!(radio->transfer_buffer)) {
kfree(radio);
return -ENOMEM;
}
v4l2_dev = &radio->v4l2_dev;
v4l2_dev->release = usb_dsbr100_release;
retval = v4l2_device_register(&intf->dev, v4l2_dev);
if (retval < 0) {
v4l2_err(v4l2_dev, "couldn't register v4l2_device\n");
goto err_reg_dev;
}
v4l2_ctrl_handler_init(&radio->hdl, 1);
v4l2_ctrl_new_std(&radio->hdl, &usb_dsbr100_ctrl_ops,
V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
if (radio->hdl.error) {
retval = radio->hdl.error;
v4l2_err(v4l2_dev, "couldn't register control\n");
goto err_reg_ctrl;
}
mutex_init(&radio->v4l2_lock);
strscpy(radio->videodev.name, v4l2_dev->name,
sizeof(radio->videodev.name));
radio->videodev.v4l2_dev = v4l2_dev;
radio->videodev.fops = &usb_dsbr100_fops;
radio->videodev.ioctl_ops = &usb_dsbr100_ioctl_ops;
radio->videodev.release = video_device_release_empty;
radio->videodev.lock = &radio->v4l2_lock;
radio->videodev.ctrl_handler = &radio->hdl;
radio->videodev.device_caps = V4L2_CAP_RADIO | V4L2_CAP_TUNER;
radio->usbdev = interface_to_usbdev(intf);
radio->curfreq = FREQ_MIN * FREQ_MUL;
radio->muted = true;
video_set_drvdata(&radio->videodev, radio);
usb_set_intfdata(intf, radio);
retval = video_register_device(&radio->videodev, VFL_TYPE_RADIO, radio_nr);
if (retval == 0)
return 0;
v4l2_err(v4l2_dev, "couldn't register video device\n");
err_reg_ctrl:
v4l2_ctrl_handler_free(&radio->hdl);
v4l2_device_unregister(v4l2_dev);
err_reg_dev:
kfree(radio->transfer_buffer);
kfree(radio);
return retval;
}
static const struct usb_device_id usb_dsbr100_device_table[] = {
{ USB_DEVICE(DSB100_VENDOR, DSB100_PRODUCT) },
{ } /* Terminating entry */
};
MODULE_DEVICE_TABLE(usb, usb_dsbr100_device_table);
/* USB subsystem interface */
static struct usb_driver usb_dsbr100_driver = {
.name = "dsbr100",
.probe = usb_dsbr100_probe,
.disconnect = usb_dsbr100_disconnect,
.id_table = usb_dsbr100_device_table,
.suspend = usb_dsbr100_suspend,
.resume = usb_dsbr100_resume,
.reset_resume = usb_dsbr100_resume,
};
module_usb_driver(usb_dsbr100_driver);