402 lines
9.5 KiB
C
402 lines
9.5 KiB
C
/*
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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
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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; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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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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/* driver definitions */
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#define DRIVER_AUTHOR "Joonyoung Shim <jy0922.shim@samsung.com>";
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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_DESC "I2C radio driver for Si470x FM Radio Receivers"
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#define DRIVER_VERSION "1.0.0"
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/* kernel includes */
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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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/* I2C Device ID List */
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static const struct i2c_device_id si470x_i2c_id[] = {
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/* Generic Entry */
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{ "si470x", 0 },
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/* Terminating entry */
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, si470x_i2c_id);
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/**************************************************************************
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* Module Parameters
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**************************************************************************/
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/* Radio Nr */
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static int radio_nr = -1;
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module_param(radio_nr, int, 0444);
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MODULE_PARM_DESC(radio_nr, "Radio Nr");
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/**************************************************************************
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* I2C Definitions
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**************************************************************************/
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/* Write starts with the upper byte of register 0x02 */
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#define WRITE_REG_NUM 8
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#define WRITE_INDEX(i) (i + 0x02)
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/* Read starts 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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/**************************************************************************
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* General Driver Functions - REGISTERs
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**************************************************************************/
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/*
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* si470x_get_register - read register
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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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/*
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* si470x_set_register - write register
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*/
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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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/**************************************************************************
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* General Driver Functions - ENTIRE REGISTERS
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**************************************************************************/
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/*
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* si470x_get_all_registers - read entire registers
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*/
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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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/**************************************************************************
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* General Driver Functions - DISCONNECT_CHECK
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**************************************************************************/
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/*
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* si470x_disconnect_check - check whether radio disconnects
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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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/**************************************************************************
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* File Operations Interface
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**************************************************************************/
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/*
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* si470x_fops_open - file open
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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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/*
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* si470x_fops_release - file release
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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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/*
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* si470x_fops - file operations interface
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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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/**************************************************************************
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* Video4Linux Interface
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**************************************************************************/
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/*
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* si470x_vidioc_querycap - query device capabilities
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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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/**************************************************************************
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* I2C Interface
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**************************************************************************/
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/*
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* si470x_i2c_probe - probe for the device
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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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unsigned char version_warning = 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->users = 0;
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radio->client = client;
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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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/* get device and chip versions */
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if (si470x_get_all_registers(radio) < 0) {
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retval = -EIO;
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goto err_video;
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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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if ((radio->registers[CHIPID] & CHIPID_FIRMWARE) < RADIO_FW_VERSION) {
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dev_warn(&client->dev,
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"This driver is known to work with "
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"firmware version %hu,\n", RADIO_FW_VERSION);
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dev_warn(&client->dev,
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"but the device has firmware version %hu.\n",
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radio->registers[CHIPID] & CHIPID_FIRMWARE);
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version_warning = 1;
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}
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/* give out version warning */
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if (version_warning == 1) {
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dev_warn(&client->dev,
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"If you have some trouble using this driver,\n");
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dev_warn(&client->dev,
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"please report to V4L ML at "
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"linux-media@vger.kernel.org\n");
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}
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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,
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radio_nr);
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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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err_video:
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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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/*
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* si470x_i2c_remove - remove the device
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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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/*
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* si470x_i2c_driver - i2c driver interface
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*/
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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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/**************************************************************************
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* Module Interface
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**************************************************************************/
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/*
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* si470x_i2c_init - module init
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*/
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static int __init si470x_i2c_init(void)
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{
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printk(KERN_INFO DRIVER_DESC ", Version " DRIVER_VERSION "\n");
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return i2c_add_driver(&si470x_i2c_driver);
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}
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/*
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* si470x_i2c_exit - module exit
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*/
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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_init(si470x_i2c_init);
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module_exit(si470x_i2c_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR(DRIVER_AUTHOR);
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_VERSION(DRIVER_VERSION);
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