[media] si4713: Added the USB driver for Si4713
This is the USB driver for the Silicon Labs development board. It contains the Si4713 FM transmitter chip. Signed-off-by: Dinesh Ram <dinesh.ram@cern.ch> Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Tested-by: Eduardo Valentin <edubezval@gmail.com> Acked-by: Eduardo Valentin <edubezval@gmail.com> Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
This commit is contained in:
Dinesh Ram
Mauro Carvalho Chehab
Родитель
adc2325923
Коммит
b874b39fcd
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@ -1,3 +1,18 @@
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config USB_SI4713
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tristate "Silicon Labs Si4713 FM Radio Transmitter support with USB"
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depends on USB && RADIO_SI4713
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select SI4713
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---help---
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This is a driver for USB devices with the Silicon Labs SI4713
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chip. Currently these devices are known to work.
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- 10c4:8244: Silicon Labs FM Transmitter USB device.
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Say Y here if you want to connect this type of radio to your
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computer's USB port.
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To compile this driver as a module, choose M here: the
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module will be called radio-usb-si4713.
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config PLATFORM_SI4713
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tristate "Silicon Labs Si4713 FM Radio Transmitter support with I2C"
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depends on I2C && RADIO_SI4713
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@ -3,4 +3,5 @@
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#
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obj-$(CONFIG_I2C_SI4713) += si4713.o
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obj-$(CONFIG_USB_SI4713) += radio-usb-si4713.o
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obj-$(CONFIG_PLATFORM_SI4713) += radio-platform-si4713.o
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@ -0,0 +1,540 @@
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/*
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* Copyright 2013 Cisco Systems, Inc. and/or its affiliates.
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* All rights reserved.
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*
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* This program is free software; you may redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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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/usb.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/mutex.h>
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#include <linux/i2c.h>
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/* V4l includes */
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#include <linux/videodev2.h>
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#include <media/v4l2-common.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-event.h>
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#include <media/si4713.h>
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#include "si4713.h"
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/* driver and module definitions */
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MODULE_AUTHOR("Dinesh Ram <dinesh.ram@cern.ch>");
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MODULE_DESCRIPTION("Si4713 FM Transmitter USB driver");
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MODULE_LICENSE("GPL v2");
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/* The Device announces itself as Cygnal Integrated Products, Inc. */
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#define USB_SI4713_VENDOR 0x10c4
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#define USB_SI4713_PRODUCT 0x8244
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#define BUFFER_LENGTH 64
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#define USB_TIMEOUT 1000
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#define USB_RESP_TIMEOUT 50000
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/* USB Device ID List */
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static struct usb_device_id usb_si4713_usb_device_table[] = {
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{USB_DEVICE_AND_INTERFACE_INFO(USB_SI4713_VENDOR, USB_SI4713_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_si4713_usb_device_table);
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struct si4713_usb_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_subdev *v4l2_subdev;
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struct mutex lock;
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struct i2c_adapter i2c_adapter;
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u8 *buffer;
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};
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static inline struct si4713_usb_device *to_si4713_dev(struct v4l2_device *v4l2_dev)
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{
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return container_of(v4l2_dev, struct si4713_usb_device, v4l2_dev);
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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 si4713_usb_device *radio = video_drvdata(file);
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strlcpy(v->driver, "radio-usb-si4713", sizeof(v->driver));
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strlcpy(v->card, "Si4713 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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v->device_caps = V4L2_CAP_MODULATOR | V4L2_CAP_RDS_OUTPUT;
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v->capabilities = v->device_caps | V4L2_CAP_DEVICE_CAPS;
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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 *vm)
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{
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struct si4713_usb_device *radio = video_drvdata(file);
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return v4l2_subdev_call(radio->v4l2_subdev, tuner, g_modulator, vm);
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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 *vm)
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{
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struct si4713_usb_device *radio = video_drvdata(file);
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return v4l2_subdev_call(radio->v4l2_subdev, tuner, s_modulator, vm);
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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 *vf)
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{
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struct si4713_usb_device *radio = video_drvdata(file);
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return v4l2_subdev_call(radio->v4l2_subdev, tuner, s_frequency, vf);
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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 *vf)
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{
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struct si4713_usb_device *radio = video_drvdata(file);
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return v4l2_subdev_call(radio->v4l2_subdev, tuner, g_frequency, vf);
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}
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static const struct v4l2_ioctl_ops usb_si4713_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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/* File system interface */
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static const struct v4l2_file_operations usb_si4713_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 void usb_si4713_video_device_release(struct v4l2_device *v4l2_dev)
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{
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struct si4713_usb_device *radio = to_si4713_dev(v4l2_dev);
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struct i2c_adapter *adapter = &radio->i2c_adapter;
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i2c_del_adapter(adapter);
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v4l2_device_unregister(&radio->v4l2_dev);
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kfree(radio->buffer);
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kfree(radio);
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}
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/*
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* This command sequence emulates the behaviour of the Windows driver.
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* The structure of these commands was determined by sniffing the
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* usb traffic of the device during startup.
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* Most likely, these commands make some queries to the device.
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* Commands are sent to enquire parameters like the bus mode,
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* component revision, boot mode, the device serial number etc.
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*
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* These commands are necessary to be sent in this order during startup.
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* The device fails to powerup if these commands are not sent.
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*
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* The complete list of startup commands is given in the start_seq table below.
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*/
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static int si4713_send_startup_command(struct si4713_usb_device *radio)
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{
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unsigned long until_jiffies = jiffies + usecs_to_jiffies(USB_RESP_TIMEOUT) + 1;
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u8 *buffer = radio->buffer;
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int retval;
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/* send the command */
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retval = usb_control_msg(radio->usbdev, usb_sndctrlpipe(radio->usbdev, 0),
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0x09, 0x21, 0x033f, 0, radio->buffer,
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BUFFER_LENGTH, USB_TIMEOUT);
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if (retval < 0)
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return retval;
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for (;;) {
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/* receive the response */
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retval = usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
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0x01, 0xa1, 0x033f, 0, radio->buffer,
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BUFFER_LENGTH, USB_TIMEOUT);
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if (retval < 0)
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return retval;
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if (!radio->buffer[1]) {
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/* USB traffic sniffing showed that some commands require
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* additional checks. */
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switch (buffer[1]) {
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case 0x32:
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if (radio->buffer[2] == 0)
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return 0;
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break;
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case 0x14:
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case 0x12:
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if (radio->buffer[2] & SI4713_CTS)
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return 0;
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break;
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case 0x06:
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if ((radio->buffer[2] & SI4713_CTS) && radio->buffer[9] == 0x08)
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return 0;
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break;
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default:
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return 0;
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}
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}
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if (time_is_before_jiffies(until_jiffies))
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return -EIO;
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msleep(3);
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}
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return retval;
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}
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struct si4713_start_seq_table {
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int len;
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u8 payload[8];
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};
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/*
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* Some of the startup commands that could be recognized are :
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* (0x03): Get serial number of the board (Response : CB000-00-00)
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* (0x06, 0x03, 0x03, 0x08, 0x01, 0x0f) : Get Component revision
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*/
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struct si4713_start_seq_table start_seq[] = {
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{ 1, { 0x03 } },
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{ 2, { 0x32, 0x7f } },
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{ 6, { 0x06, 0x03, 0x03, 0x08, 0x01, 0x0f } },
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{ 2, { 0x14, 0x02 } },
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{ 2, { 0x09, 0x90 } },
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{ 3, { 0x08, 0x90, 0xfa } },
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{ 2, { 0x36, 0x01 } },
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{ 2, { 0x05, 0x03 } },
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{ 7, { 0x06, 0x00, 0x06, 0x0e, 0x01, 0x0f, 0x05 } },
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{ 1, { 0x12 } },
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/* Commands that are sent after pressing the 'Initialize'
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button in the windows application */
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{ 1, { 0x03 } },
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{ 1, { 0x01 } },
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{ 2, { 0x09, 0x90 } },
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{ 3, { 0x08, 0x90, 0xfa } },
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{ 1, { 0x34 } },
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{ 2, { 0x35, 0x01 } },
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{ 2, { 0x36, 0x01 } },
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{ 2, { 0x30, 0x09 } },
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{ 4, { 0x30, 0x06, 0x00, 0xe2 } },
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{ 3, { 0x31, 0x01, 0x30 } },
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{ 3, { 0x31, 0x04, 0x09 } },
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{ 2, { 0x05, 0x02 } },
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{ 6, { 0x06, 0x03, 0x03, 0x08, 0x01, 0x0f } },
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};
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static int si4713_start_seq(struct si4713_usb_device *radio)
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{
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int retval = 0;
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int i;
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radio->buffer[0] = 0x3f;
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for (i = 0; i < ARRAY_SIZE(start_seq); i++) {
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int len = start_seq[i].len;
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u8 *payload = start_seq[i].payload;
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memcpy(radio->buffer + 1, payload, len);
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memset(radio->buffer + len + 1, 0, BUFFER_LENGTH - 1 - len);
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retval = si4713_send_startup_command(radio);
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}
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return retval;
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}
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static struct i2c_board_info si4713_board_info = {
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I2C_BOARD_INFO("si4713", SI4713_I2C_ADDR_BUSEN_HIGH),
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};
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struct si4713_command_table {
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int command_id;
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u8 payload[8];
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};
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/*
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* Structure of a command :
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* Byte 1 : 0x3f (always)
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* Byte 2 : 0x06 (send a command)
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* Byte 3 : Unknown
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* Byte 4 : Number of arguments + 1 (for the command byte)
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* Byte 5 : Number of response bytes
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*/
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struct si4713_command_table command_table[] = {
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{ SI4713_CMD_POWER_UP, { 0x00, SI4713_PWUP_NARGS + 1, SI4713_PWUP_NRESP} },
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{ SI4713_CMD_GET_REV, { 0x03, 0x01, SI4713_GETREV_NRESP } },
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{ SI4713_CMD_POWER_DOWN, { 0x00, 0x01, SI4713_PWDN_NRESP} },
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{ SI4713_CMD_SET_PROPERTY, { 0x00, SI4713_SET_PROP_NARGS + 1, SI4713_SET_PROP_NRESP } },
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{ SI4713_CMD_GET_PROPERTY, { 0x00, SI4713_GET_PROP_NARGS + 1, SI4713_GET_PROP_NRESP } },
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{ SI4713_CMD_TX_TUNE_FREQ, { 0x03, SI4713_TXFREQ_NARGS + 1, SI4713_TXFREQ_NRESP } },
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{ SI4713_CMD_TX_TUNE_POWER, { 0x03, SI4713_TXPWR_NARGS + 1, SI4713_TXPWR_NRESP } },
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{ SI4713_CMD_TX_TUNE_MEASURE, { 0x03, SI4713_TXMEA_NARGS + 1, SI4713_TXMEA_NRESP } },
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{ SI4713_CMD_TX_TUNE_STATUS, { 0x00, SI4713_TXSTATUS_NARGS + 1, SI4713_TXSTATUS_NRESP } },
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{ SI4713_CMD_TX_ASQ_STATUS, { 0x03, SI4713_ASQSTATUS_NARGS + 1, SI4713_ASQSTATUS_NRESP } },
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{ SI4713_CMD_GET_INT_STATUS, { 0x03, 0x01, SI4713_GET_STATUS_NRESP } },
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{ SI4713_CMD_TX_RDS_BUFF, { 0x03, SI4713_RDSBUFF_NARGS + 1, SI4713_RDSBUFF_NRESP } },
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{ SI4713_CMD_TX_RDS_PS, { 0x00, SI4713_RDSPS_NARGS + 1, SI4713_RDSPS_NRESP } },
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};
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static int send_command(struct si4713_usb_device *radio, u8 *payload, char *data, int len)
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{
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int retval;
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radio->buffer[0] = 0x3f;
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radio->buffer[1] = 0x06;
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memcpy(radio->buffer + 2, payload, 3);
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memcpy(radio->buffer + 5, data, len);
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memset(radio->buffer + 5 + len, 0, BUFFER_LENGTH - 5 - len);
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/* send the command */
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retval = usb_control_msg(radio->usbdev, usb_sndctrlpipe(radio->usbdev, 0),
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0x09, 0x21, 0x033f, 0, radio->buffer,
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BUFFER_LENGTH, USB_TIMEOUT);
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return retval < 0 ? retval : 0;
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}
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static int si4713_i2c_read(struct si4713_usb_device *radio, char *data, int len)
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{
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unsigned long until_jiffies = jiffies + usecs_to_jiffies(USB_RESP_TIMEOUT) + 1;
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int retval;
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/* receive the response */
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for (;;) {
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retval = usb_control_msg(radio->usbdev,
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usb_rcvctrlpipe(radio->usbdev, 0),
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0x01, 0xa1, 0x033f, 0, radio->buffer,
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BUFFER_LENGTH, USB_TIMEOUT);
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if (retval < 0)
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return retval;
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/*
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* Check that we get a valid reply back (buffer[1] == 0) and
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* that CTS is set before returning, otherwise we wait and try
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* again. The i2c driver also does the CTS check, but the timeouts
|
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* used there are much too small for this USB driver, so we wait
|
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* for it here.
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*/
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if (radio->buffer[1] == 0 && (radio->buffer[2] & SI4713_CTS)) {
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memcpy(data, radio->buffer + 2, len);
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return 0;
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}
|
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if (time_is_before_jiffies(until_jiffies)) {
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/* Zero the status value, ensuring CTS isn't set */
|
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data[0] = 0;
|
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return 0;
|
||||
}
|
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msleep(3);
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}
|
||||
}
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|
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static int si4713_i2c_write(struct si4713_usb_device *radio, char *data, int len)
|
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{
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int retval = -EINVAL;
|
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int i;
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|
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if (len > BUFFER_LENGTH - 5)
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return -EINVAL;
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|
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for (i = 0; i < ARRAY_SIZE(command_table); i++) {
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if (data[0] == command_table[i].command_id)
|
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retval = send_command(radio, command_table[i].payload,
|
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data, len);
|
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}
|
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|
||||
return retval < 0 ? retval : 0;
|
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}
|
||||
|
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static int si4713_transfer(struct i2c_adapter *i2c_adapter,
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struct i2c_msg *msgs, int num)
|
||||
{
|
||||
struct si4713_usb_device *radio = i2c_get_adapdata(i2c_adapter);
|
||||
int retval = -EINVAL;
|
||||
int i;
|
||||
|
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if (num <= 0)
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return 0;
|
||||
|
||||
for (i = 0; i < num; i++) {
|
||||
if (msgs[i].flags & I2C_M_RD)
|
||||
retval = si4713_i2c_read(radio, msgs[i].buf, msgs[i].len);
|
||||
else
|
||||
retval = si4713_i2c_write(radio, msgs[i].buf, msgs[i].len);
|
||||
if (retval)
|
||||
break;
|
||||
}
|
||||
|
||||
return retval ? retval : num;
|
||||
}
|
||||
|
||||
static u32 si4713_functionality(struct i2c_adapter *adapter)
|
||||
{
|
||||
return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
|
||||
}
|
||||
|
||||
static struct i2c_algorithm si4713_algo = {
|
||||
.master_xfer = si4713_transfer,
|
||||
.functionality = si4713_functionality,
|
||||
};
|
||||
|
||||
/* This name value shows up in the sysfs filename associated
|
||||
with this I2C adapter */
|
||||
static struct i2c_adapter si4713_i2c_adapter_template = {
|
||||
.name = "si4713-i2c",
|
||||
.owner = THIS_MODULE,
|
||||
.algo = &si4713_algo,
|
||||
};
|
||||
|
||||
int si4713_register_i2c_adapter(struct si4713_usb_device *radio)
|
||||
{
|
||||
radio->i2c_adapter = si4713_i2c_adapter_template;
|
||||
/* set up sysfs linkage to our parent device */
|
||||
radio->i2c_adapter.dev.parent = &radio->usbdev->dev;
|
||||
i2c_set_adapdata(&radio->i2c_adapter, radio);
|
||||
|
||||
return i2c_add_adapter(&radio->i2c_adapter);
|
||||
}
|
||||
|
||||
/* check if the device is present and register with v4l and usb if it is */
|
||||
static int usb_si4713_probe(struct usb_interface *intf,
|
||||
const struct usb_device_id *id)
|
||||
{
|
||||
struct si4713_usb_device *radio;
|
||||
struct i2c_adapter *adapter;
|
||||
struct v4l2_subdev *sd;
|
||||
int retval = -ENOMEM;
|
||||
|
||||
dev_info(&intf->dev, "Si4713 development board discovered: (%04X:%04X)\n",
|
||||
id->idVendor, id->idProduct);
|
||||
|
||||
/* Initialize local device structure */
|
||||
radio = kzalloc(sizeof(struct si4713_usb_device), GFP_KERNEL);
|
||||
if (radio)
|
||||
radio->buffer = kmalloc(BUFFER_LENGTH, GFP_KERNEL);
|
||||
|
||||
if (!radio || !radio->buffer) {
|
||||
dev_err(&intf->dev, "kmalloc for si4713_usb_device failed\n");
|
||||
kfree(radio);
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
mutex_init(&radio->lock);
|
||||
|
||||
radio->usbdev = interface_to_usbdev(intf);
|
||||
radio->intf = intf;
|
||||
usb_set_intfdata(intf, &radio->v4l2_dev);
|
||||
|
||||
retval = si4713_start_seq(radio);
|
||||
if (retval < 0)
|
||||
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;
|
||||
}
|
||||
|
||||
retval = si4713_register_i2c_adapter(radio);
|
||||
if (retval < 0) {
|
||||
dev_err(&intf->dev, "could not register i2c device\n");
|
||||
goto err_i2cdev;
|
||||
}
|
||||
|
||||
adapter = &radio->i2c_adapter;
|
||||
sd = v4l2_i2c_new_subdev_board(&radio->v4l2_dev, adapter,
|
||||
&si4713_board_info, NULL);
|
||||
radio->v4l2_subdev = sd;
|
||||
if (!sd) {
|
||||
dev_err(&intf->dev, "cannot get v4l2 subdevice\n");
|
||||
retval = -ENODEV;
|
||||
goto del_adapter;
|
||||
}
|
||||
|
||||
radio->vdev.ctrl_handler = sd->ctrl_handler;
|
||||
radio->v4l2_dev.release = usb_si4713_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_si4713_fops;
|
||||
radio->vdev.ioctl_ops = &usb_si4713_ioctl_ops;
|
||||
radio->vdev.lock = &radio->lock;
|
||||
radio->vdev.release = video_device_release_empty;
|
||||
radio->vdev.vfl_dir = VFL_DIR_TX;
|
||||
|
||||
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 del_adapter;
|
||||
}
|
||||
|
||||
dev_info(&intf->dev, "V4L2 device registered as %s\n",
|
||||
video_device_node_name(&radio->vdev));
|
||||
|
||||
return 0;
|
||||
|
||||
del_adapter:
|
||||
i2c_del_adapter(adapter);
|
||||
err_i2cdev:
|
||||
v4l2_device_unregister(&radio->v4l2_dev);
|
||||
err_v4l2:
|
||||
kfree(radio->buffer);
|
||||
kfree(radio);
|
||||
return retval;
|
||||
}
|
||||
|
||||
static void usb_si4713_disconnect(struct usb_interface *intf)
|
||||
{
|
||||
struct si4713_usb_device *radio = to_si4713_dev(usb_get_intfdata(intf));
|
||||
|
||||
dev_info(&intf->dev, "Si4713 development board now 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);
|
||||
}
|
||||
|
||||
/* USB subsystem interface */
|
||||
static struct usb_driver usb_si4713_driver = {
|
||||
.name = "radio-usb-si4713",
|
||||
.probe = usb_si4713_probe,
|
||||
.disconnect = usb_si4713_disconnect,
|
||||
.id_table = usb_si4713_usb_device_table,
|
||||
};
|
||||
|
||||
module_usb_driver(usb_si4713_driver);
|
||||
Загрузка…
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