linux/drivers/media/radio/radio-keene.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

406 lines
11 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) 2012 Hans Verkuil <hverkuil@xs4all.nl>
*/
/* 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 const 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 transmit 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 ? 0 : 1) | (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));
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 usb_keene_suspend(struct usb_interface *intf, pm_message_t message)
{
struct keene_device *radio = to_keene_dev(usb_get_intfdata(intf));
return keene_cmd_main(radio, 0, false);
}
static int usb_keene_resume(struct usb_interface *intf)
{
struct keene_device *radio = to_keene_dev(usb_get_intfdata(intf));
mdelay(50);
keene_cmd_set(radio);
keene_cmd_main(radio, radio->curfreq, true);
return 0;
}
static int vidioc_querycap(struct file *file, void *priv,
struct v4l2_capability *v)
{
struct keene_device *radio = video_drvdata(file);
strscpy(v->driver, "radio-keene", sizeof(v->driver));
strscpy(v->card, "Keene FM Transmitter", sizeof(v->card));
usb_make_path(radio->usbdev, v->bus_info, sizeof(v->bus_info));
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;
strscpy(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,
const 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,
const struct v4l2_frequency *f)
{
struct keene_device *radio = video_drvdata(file);
unsigned freq = f->frequency;
if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
return -EINVAL;
freq = clamp(freq, FREQ_MIN * FREQ_MUL, FREQ_MAX * FREQ_MUL);
return keene_cmd_main(radio, freq, 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 - (s32)ctrl->minimum) / (s32)ctrl->step];
return keene_cmd_set(radio);
}
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 = v4l2_ctrl_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;
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;
strscpy(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->vdev.vfl_dir = VFL_DIR_TX;
radio->vdev.device_caps = V4L2_CAP_RADIO | V4L2_CAP_MODULATOR;
radio->usbdev = interface_to_usbdev(intf);
radio->intf = intf;
usb_set_intfdata(intf, &radio->v4l2_dev);
video_set_drvdata(&radio->vdev, radio);
/* at least 11ms is needed in order to settle hardware */
msleep(20);
keene_cmd_main(radio, 95.16 * FREQ_MUL, false);
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,
.suspend = usb_keene_suspend,
.resume = usb_keene_resume,
.reset_resume = usb_keene_resume,
};
module_usb_driver(usb_keene_driver);