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