mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-30 08:02:30 +00:00
V4L/DVB (12416): radio-si470x: add i2c driver for si470x
This patch supports i2c interface of si470x. The i2c specific part exists in radio-si470x-i2c.c file and the common part uses radio-si470x-common.c file. The '#if defined' is inserted inevitably because of parts used only si470x usb in the common file. The current driver version doesn't support the RDS. Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com> Signed-off-by: Tobias Lorenz <tobias.lorenz@gmx.net> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Joonyoung Shim
Mauro Carvalho Chehab
parent
3c7cc8d52c
commit
cc35bbddfe
5 changed files with 281 additions and 0 deletions
|
|
@ -22,3 +22,16 @@ config USB_SI470X
|
|||
|
||||
To compile this driver as a module, choose M here: the
|
||||
module will be called radio-usb-si470x.
|
||||
|
||||
config I2C_SI470X
|
||||
tristate "Silicon Labs Si470x FM Radio Receiver support with I2C"
|
||||
depends on I2C && RADIO_SI470X && !USB_SI470X
|
||||
---help---
|
||||
This is a driver for I2C devices with the Silicon Labs SI470x
|
||||
chip.
|
||||
|
||||
Say Y here if you want to connect this type of radio to your
|
||||
computer's I2C port.
|
||||
|
||||
To compile this driver as a module, choose M here: the
|
||||
module will be called radio-i2c-si470x.
|
||||
|
|
|
|||
|
|
@ -3,5 +3,7 @@
|
|||
#
|
||||
|
||||
radio-usb-si470x-objs := radio-si470x-usb.o radio-si470x-common.o
|
||||
radio-i2c-si470x-objs := radio-si470x-i2c.o radio-si470x-common.o
|
||||
|
||||
obj-$(CONFIG_USB_SI470X) += radio-usb-si470x.o
|
||||
obj-$(CONFIG_I2C_SI470X) += radio-i2c-si470x.o
|
||||
|
|
|
|||
|
|
@ -581,8 +581,12 @@ static int si470x_vidioc_g_tuner(struct file *file, void *priv,
|
|||
/* driver constants */
|
||||
strcpy(tuner->name, "FM");
|
||||
tuner->type = V4L2_TUNER_RADIO;
|
||||
#if defined(CONFIG_USB_SI470X) || defined(CONFIG_USB_SI470X_MODULE)
|
||||
tuner->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
|
||||
V4L2_TUNER_CAP_RDS;
|
||||
#else
|
||||
tuner->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO;
|
||||
#endif
|
||||
|
||||
/* range limits */
|
||||
switch ((radio->registers[SYSCONFIG2] & SYSCONFIG2_BAND) >> 6) {
|
||||
|
|
@ -608,10 +612,12 @@ static int si470x_vidioc_g_tuner(struct file *file, void *priv,
|
|||
tuner->rxsubchans = V4L2_TUNER_SUB_MONO;
|
||||
else
|
||||
tuner->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
|
||||
#if defined(CONFIG_USB_SI470X) || defined(CONFIG_USB_SI470X_MODULE)
|
||||
/* If there is a reliable method of detecting an RDS channel,
|
||||
then this code should check for that before setting this
|
||||
RDS subchannel. */
|
||||
tuner->rxsubchans |= V4L2_TUNER_SUB_RDS;
|
||||
#endif
|
||||
|
||||
/* mono/stereo selector */
|
||||
if ((radio->registers[POWERCFG] & POWERCFG_MONO) == 0)
|
||||
|
|
|
|||
254
drivers/media/radio/si470x/radio-si470x-i2c.c
Normal file
254
drivers/media/radio/si470x/radio-si470x-i2c.c
Normal file
|
|
@ -0,0 +1,254 @@
|
|||
/*
|
||||
* drivers/media/radio/si470x/radio-si470x-i2c.c
|
||||
*
|
||||
* I2C driver for radios with Silicon Labs Si470x FM Radio Receivers
|
||||
*
|
||||
* Copyright (C) 2009 Samsung Electronics Co.Ltd
|
||||
* Author: Joonyoung Shim <jy0922.shim@samsung.com>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify it
|
||||
* under the terms of the GNU General Public License as published by the
|
||||
* Free Software Foundation; either version 2 of the License, or (at your
|
||||
* option) any later version.
|
||||
*
|
||||
*
|
||||
* TODO:
|
||||
* - RDS support
|
||||
*
|
||||
*/
|
||||
|
||||
#include <linux/module.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/i2c.h>
|
||||
#include <linux/delay.h>
|
||||
|
||||
#include "radio-si470x.h"
|
||||
|
||||
#define DRIVER_KERNEL_VERSION KERNEL_VERSION(1, 0, 0)
|
||||
#define DRIVER_CARD "Silicon Labs Si470x FM Radio Receiver"
|
||||
#define DRIVER_VERSION "1.0.0"
|
||||
|
||||
/* starting with the upper byte of register 0x0a */
|
||||
#define READ_REG_NUM RADIO_REGISTER_NUM
|
||||
#define READ_INDEX(i) ((i + RADIO_REGISTER_NUM - 0x0a) % READ_REG_NUM)
|
||||
|
||||
static int si470x_get_all_registers(struct si470x_device *radio)
|
||||
{
|
||||
int i;
|
||||
u16 buf[READ_REG_NUM];
|
||||
struct i2c_msg msgs[1] = {
|
||||
{ radio->client->addr, I2C_M_RD, sizeof(u16) * READ_REG_NUM,
|
||||
(void *)buf },
|
||||
};
|
||||
|
||||
if (i2c_transfer(radio->client->adapter, msgs, 1) != 1)
|
||||
return -EIO;
|
||||
|
||||
for (i = 0; i < READ_REG_NUM; i++)
|
||||
radio->registers[i] = __be16_to_cpu(buf[READ_INDEX(i)]);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int si470x_get_register(struct si470x_device *radio, int regnr)
|
||||
{
|
||||
u16 buf[READ_REG_NUM];
|
||||
struct i2c_msg msgs[1] = {
|
||||
{ radio->client->addr, I2C_M_RD, sizeof(u16) * READ_REG_NUM,
|
||||
(void *)buf },
|
||||
};
|
||||
|
||||
if (i2c_transfer(radio->client->adapter, msgs, 1) != 1)
|
||||
return -EIO;
|
||||
|
||||
radio->registers[regnr] = __be16_to_cpu(buf[READ_INDEX(regnr)]);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* starting with the upper byte of register 0x02h */
|
||||
#define WRITE_REG_NUM 8
|
||||
#define WRITE_INDEX(i) (i + 0x02)
|
||||
|
||||
int si470x_set_register(struct si470x_device *radio, int regnr)
|
||||
{
|
||||
int i;
|
||||
u16 buf[WRITE_REG_NUM];
|
||||
struct i2c_msg msgs[1] = {
|
||||
{ radio->client->addr, 0, sizeof(u16) * WRITE_REG_NUM,
|
||||
(void *)buf },
|
||||
};
|
||||
|
||||
for (i = 0; i < WRITE_REG_NUM; i++)
|
||||
buf[i] = __cpu_to_be16(radio->registers[WRITE_INDEX(i)]);
|
||||
|
||||
if (i2c_transfer(radio->client->adapter, msgs, 1) != 1)
|
||||
return -EIO;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int si470x_disconnect_check(struct si470x_device *radio)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int si470x_fops_open(struct file *file)
|
||||
{
|
||||
struct si470x_device *radio = video_drvdata(file);
|
||||
int retval = 0;
|
||||
|
||||
mutex_lock(&radio->lock);
|
||||
radio->users++;
|
||||
|
||||
if (radio->users == 1)
|
||||
/* start radio */
|
||||
retval = si470x_start(radio);
|
||||
mutex_unlock(&radio->lock);
|
||||
|
||||
return retval;
|
||||
}
|
||||
|
||||
static int si470x_fops_release(struct file *file)
|
||||
{
|
||||
struct si470x_device *radio = video_drvdata(file);
|
||||
int retval = 0;
|
||||
|
||||
/* safety check */
|
||||
if (!radio)
|
||||
return -ENODEV;
|
||||
|
||||
mutex_lock(&radio->lock);
|
||||
radio->users--;
|
||||
if (radio->users == 0)
|
||||
/* stop radio */
|
||||
retval = si470x_stop(radio);
|
||||
mutex_unlock(&radio->lock);
|
||||
|
||||
return retval;
|
||||
}
|
||||
|
||||
const struct v4l2_file_operations si470x_fops = {
|
||||
.owner = THIS_MODULE,
|
||||
.ioctl = video_ioctl2,
|
||||
.open = si470x_fops_open,
|
||||
.release = si470x_fops_release,
|
||||
};
|
||||
|
||||
int si470x_vidioc_querycap(struct file *file, void *priv,
|
||||
struct v4l2_capability *capability)
|
||||
{
|
||||
strlcpy(capability->driver, DRIVER_NAME, sizeof(capability->driver));
|
||||
strlcpy(capability->card, DRIVER_CARD, sizeof(capability->card));
|
||||
capability->version = DRIVER_KERNEL_VERSION;
|
||||
capability->capabilities = V4L2_CAP_HW_FREQ_SEEK |
|
||||
V4L2_CAP_TUNER | V4L2_CAP_RADIO;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int __devinit si470x_i2c_probe(struct i2c_client *client,
|
||||
const struct i2c_device_id *id)
|
||||
{
|
||||
struct si470x_device *radio;
|
||||
int retval = 0;
|
||||
|
||||
/* private data allocation and initialization */
|
||||
radio = kzalloc(sizeof(struct si470x_device), GFP_KERNEL);
|
||||
if (!radio) {
|
||||
retval = -ENOMEM;
|
||||
goto err_initial;
|
||||
}
|
||||
radio->client = client;
|
||||
radio->users = 0;
|
||||
mutex_init(&radio->lock);
|
||||
|
||||
/* video device allocation and initialization */
|
||||
radio->videodev = video_device_alloc();
|
||||
if (!radio->videodev) {
|
||||
retval = -ENOMEM;
|
||||
goto err_radio;
|
||||
}
|
||||
memcpy(radio->videodev, &si470x_viddev_template,
|
||||
sizeof(si470x_viddev_template));
|
||||
video_set_drvdata(radio->videodev, radio);
|
||||
|
||||
/* power up : need 110ms */
|
||||
radio->registers[POWERCFG] = POWERCFG_ENABLE;
|
||||
if (si470x_set_register(radio, POWERCFG) < 0) {
|
||||
retval = -EIO;
|
||||
goto err_all;
|
||||
}
|
||||
msleep(110);
|
||||
|
||||
/* show some infos about the specific si470x device */
|
||||
if (si470x_get_all_registers(radio) < 0) {
|
||||
retval = -EIO;
|
||||
goto err_radio;
|
||||
}
|
||||
dev_info(&client->dev, "DeviceID=0x%4.4hx ChipID=0x%4.4hx\n",
|
||||
radio->registers[DEVICEID], radio->registers[CHIPID]);
|
||||
|
||||
/* set initial frequency */
|
||||
si470x_set_freq(radio, 87.5 * FREQ_MUL); /* available in all regions */
|
||||
|
||||
/* register video device */
|
||||
retval = video_register_device(radio->videodev, VFL_TYPE_RADIO, -1);
|
||||
if (retval) {
|
||||
dev_warn(&client->dev, "Could not register video device\n");
|
||||
goto err_all;
|
||||
}
|
||||
|
||||
i2c_set_clientdata(client, radio);
|
||||
|
||||
return 0;
|
||||
err_all:
|
||||
video_device_release(radio->videodev);
|
||||
err_radio:
|
||||
kfree(radio);
|
||||
err_initial:
|
||||
return retval;
|
||||
}
|
||||
|
||||
static __devexit int si470x_i2c_remove(struct i2c_client *client)
|
||||
{
|
||||
struct si470x_device *radio = i2c_get_clientdata(client);
|
||||
|
||||
video_unregister_device(radio->videodev);
|
||||
kfree(radio);
|
||||
i2c_set_clientdata(client, NULL);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct i2c_device_id si470x_i2c_id[] = {
|
||||
{ "si470x", 0 },
|
||||
{ }
|
||||
};
|
||||
MODULE_DEVICE_TABLE(i2c, si470x_i2c_id);
|
||||
|
||||
static struct i2c_driver si470x_i2c_driver = {
|
||||
.driver = {
|
||||
.name = "si470x",
|
||||
.owner = THIS_MODULE,
|
||||
},
|
||||
.probe = si470x_i2c_probe,
|
||||
.remove = __devexit_p(si470x_i2c_remove),
|
||||
.id_table = si470x_i2c_id,
|
||||
};
|
||||
|
||||
static int __init si470x_i2c_init(void)
|
||||
{
|
||||
return i2c_add_driver(&si470x_i2c_driver);
|
||||
}
|
||||
module_init(si470x_i2c_init);
|
||||
|
||||
static void __exit si470x_i2c_exit(void)
|
||||
{
|
||||
i2c_del_driver(&si470x_i2c_driver);
|
||||
}
|
||||
module_exit(si470x_i2c_exit);
|
||||
|
||||
MODULE_DESCRIPTION("i2c radio driver for si470x fm radio receivers");
|
||||
MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
|
||||
MODULE_LICENSE("GPL");
|
||||
|
|
@ -143,6 +143,11 @@
|
|||
struct si470x_device {
|
||||
struct video_device *videodev;
|
||||
|
||||
#if defined(CONFIG_I2C_SI470X) || defined(CONFIG_I2C_SI470X_MODULE)
|
||||
struct i2c_client *client;
|
||||
#endif
|
||||
|
||||
#if defined(CONFIG_USB_SI470X) || defined(CONFIG_USB_SI470X_MODULE)
|
||||
/* reference to USB and video device */
|
||||
struct usb_device *usbdev;
|
||||
struct usb_interface *intf;
|
||||
|
|
@ -160,6 +165,7 @@ struct si470x_device {
|
|||
/* driver management */
|
||||
unsigned char disconnected;
|
||||
struct mutex disconnect_lock;
|
||||
#endif
|
||||
unsigned int users;
|
||||
|
||||
/* Silabs internal registers (0..15) */
|
||||
|
|
|
|||
Loading…
Reference in a new issue