546 lines
14 KiB
C
546 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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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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/* driver definitions */
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#define DRIVER_AUTHOR "Joonyoung Shim <jy0922.shim@samsung.com>";
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#define DRIVER_CARD "Silicon Labs Si470x FM Radio"
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#define DRIVER_DESC "I2C radio driver for Si470x FM Radio Receivers"
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#define DRIVER_VERSION "1.0.2"
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/* kernel includes */
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#include <linux/i2c.h>
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#include <linux/slab.h>
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#include <linux/delay.h>
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#include <linux/gpio/consumer.h>
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#include <linux/interrupt.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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/* RDS buffer blocks */
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static unsigned int rds_buf = 100;
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module_param(rds_buf, uint, 0444);
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MODULE_PARM_DESC(rds_buf, "RDS buffer entries: *100*");
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/* RDS maximum block errors */
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static unsigned short max_rds_errors = 1;
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/* 0 means 0 errors requiring correction */
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/* 1 means 1-2 errors requiring correction (used by original USBRadio.exe) */
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/* 2 means 3-5 errors requiring correction */
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/* 3 means 6+ errors or errors in checkword, correction not possible */
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module_param(max_rds_errors, ushort, 0644);
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MODULE_PARM_DESC(max_rds_errors, "RDS maximum block errors: *1*");
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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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static int si470x_get_register(struct si470x_device *radio, int regnr)
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{
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__be16 buf[READ_REG_NUM];
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struct i2c_msg msgs[1] = {
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{
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.addr = radio->client->addr,
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.flags = I2C_M_RD,
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.len = sizeof(u16) * READ_REG_NUM,
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.buf = (void *)buf
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},
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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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static int si470x_set_register(struct si470x_device *radio, int regnr)
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{
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int i;
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__be16 buf[WRITE_REG_NUM];
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struct i2c_msg msgs[1] = {
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{
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.addr = radio->client->addr,
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.len = sizeof(u16) * WRITE_REG_NUM,
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.buf = (void *)buf
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},
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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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__be16 buf[READ_REG_NUM];
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struct i2c_msg msgs[1] = {
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{
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.addr = radio->client->addr,
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.flags = I2C_M_RD,
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.len = sizeof(u16) * READ_REG_NUM,
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.buf = (void *)buf
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},
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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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* 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 = v4l2_fh_open(file);
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if (retval)
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return retval;
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if (v4l2_fh_is_singular_file(file)) {
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/* start radio */
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retval = si470x_start(radio);
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if (retval < 0)
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goto done;
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/* enable RDS / STC interrupt */
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radio->registers[SYSCONFIG1] |= SYSCONFIG1_RDSIEN;
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radio->registers[SYSCONFIG1] |= SYSCONFIG1_STCIEN;
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radio->registers[SYSCONFIG1] &= ~SYSCONFIG1_GPIO2;
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radio->registers[SYSCONFIG1] |= 0x1 << 2;
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retval = si470x_set_register(radio, SYSCONFIG1);
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}
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done:
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if (retval)
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v4l2_fh_release(file);
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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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if (v4l2_fh_is_singular_file(file))
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/* stop radio */
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si470x_stop(radio);
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return v4l2_fh_release(file);
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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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static 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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strscpy(capability->driver, DRIVER_NAME, sizeof(capability->driver));
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strscpy(capability->card, DRIVER_CARD, sizeof(capability->card));
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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_interrupt - interrupt handler
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*/
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static irqreturn_t si470x_i2c_interrupt(int irq, void *dev_id)
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{
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struct si470x_device *radio = dev_id;
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unsigned char regnr;
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unsigned char blocknum;
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unsigned short bler; /* rds block errors */
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unsigned short rds;
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unsigned char tmpbuf[3];
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int retval = 0;
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/* check Seek/Tune Complete */
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retval = si470x_get_register(radio, STATUSRSSI);
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if (retval < 0)
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goto end;
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if (radio->registers[STATUSRSSI] & STATUSRSSI_STC)
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complete(&radio->completion);
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/* safety checks */
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if ((radio->registers[SYSCONFIG1] & SYSCONFIG1_RDS) == 0)
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goto end;
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/* Update RDS registers */
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for (regnr = 1; regnr < RDS_REGISTER_NUM; regnr++) {
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retval = si470x_get_register(radio, STATUSRSSI + regnr);
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if (retval < 0)
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goto end;
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}
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/* get rds blocks */
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if ((radio->registers[STATUSRSSI] & STATUSRSSI_RDSR) == 0)
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/* No RDS group ready, better luck next time */
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goto end;
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for (blocknum = 0; blocknum < 4; blocknum++) {
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switch (blocknum) {
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default:
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bler = (radio->registers[STATUSRSSI] &
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STATUSRSSI_BLERA) >> 9;
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rds = radio->registers[RDSA];
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break;
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case 1:
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bler = (radio->registers[READCHAN] &
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READCHAN_BLERB) >> 14;
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rds = radio->registers[RDSB];
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break;
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case 2:
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bler = (radio->registers[READCHAN] &
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READCHAN_BLERC) >> 12;
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rds = radio->registers[RDSC];
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break;
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case 3:
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bler = (radio->registers[READCHAN] &
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READCHAN_BLERD) >> 10;
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rds = radio->registers[RDSD];
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break;
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}
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/* Fill the V4L2 RDS buffer */
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put_unaligned_le16(rds, &tmpbuf);
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tmpbuf[2] = blocknum; /* offset name */
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tmpbuf[2] |= blocknum << 3; /* received offset */
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if (bler > max_rds_errors)
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tmpbuf[2] |= 0x80; /* uncorrectable errors */
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else if (bler > 0)
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tmpbuf[2] |= 0x40; /* corrected error(s) */
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/* copy RDS block to internal buffer */
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memcpy(&radio->buffer[radio->wr_index], &tmpbuf, 3);
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radio->wr_index += 3;
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/* wrap write pointer */
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if (radio->wr_index >= radio->buf_size)
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radio->wr_index = 0;
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/* check for overflow */
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if (radio->wr_index == radio->rd_index) {
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/* increment and wrap read pointer */
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radio->rd_index += 3;
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if (radio->rd_index >= radio->buf_size)
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radio->rd_index = 0;
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}
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}
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if (radio->wr_index != radio->rd_index)
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wake_up_interruptible(&radio->read_queue);
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end:
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return IRQ_HANDLED;
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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 si470x_i2c_probe(struct i2c_client *client)
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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 = devm_kzalloc(&client->dev, sizeof(*radio), 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->band = 1; /* Default to 76 - 108 MHz */
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mutex_init(&radio->lock);
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init_completion(&radio->completion);
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radio->get_register = si470x_get_register;
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radio->set_register = si470x_set_register;
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radio->fops_open = si470x_fops_open;
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radio->fops_release = si470x_fops_release;
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radio->vidioc_querycap = si470x_vidioc_querycap;
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retval = v4l2_device_register(&client->dev, &radio->v4l2_dev);
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if (retval < 0) {
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dev_err(&client->dev, "couldn't register v4l2_device\n");
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goto err_initial;
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}
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v4l2_ctrl_handler_init(&radio->hdl, 2);
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v4l2_ctrl_new_std(&radio->hdl, &si470x_ctrl_ops,
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V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
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v4l2_ctrl_new_std(&radio->hdl, &si470x_ctrl_ops,
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V4L2_CID_AUDIO_VOLUME, 0, 15, 1, 15);
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if (radio->hdl.error) {
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retval = radio->hdl.error;
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dev_err(&client->dev, "couldn't register control\n");
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goto err_all;
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}
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/* video device initialization */
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radio->videodev = si470x_viddev_template;
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radio->videodev.ctrl_handler = &radio->hdl;
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radio->videodev.lock = &radio->lock;
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radio->videodev.v4l2_dev = &radio->v4l2_dev;
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radio->videodev.release = video_device_release_empty;
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radio->videodev.device_caps =
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V4L2_CAP_HW_FREQ_SEEK | V4L2_CAP_READWRITE | V4L2_CAP_TUNER |
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V4L2_CAP_RADIO | V4L2_CAP_RDS_CAPTURE;
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video_set_drvdata(&radio->videodev, radio);
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radio->gpio_reset = devm_gpiod_get_optional(&client->dev, "reset",
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GPIOD_OUT_LOW);
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if (IS_ERR(radio->gpio_reset)) {
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retval = PTR_ERR(radio->gpio_reset);
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dev_err(&client->dev, "Failed to request gpio: %d\n", retval);
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goto err_all;
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}
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if (radio->gpio_reset)
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gpiod_set_value(radio->gpio_reset, 1);
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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_all;
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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[SI_CHIPID]);
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if ((radio->registers[SI_CHIPID] & SI_CHIPID_FIRMWARE) < RADIO_FW_VERSION) {
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dev_warn(&client->dev,
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"This driver is known to work with firmware version %u, but the device has firmware version %u.\n"
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"If you have some trouble using this driver, please report to V4L ML at linux-media@vger.kernel.org\n",
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RADIO_FW_VERSION,
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radio->registers[SI_CHIPID] & SI_CHIPID_FIRMWARE);
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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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/* rds buffer allocation */
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radio->buf_size = rds_buf * 3;
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radio->buffer = devm_kmalloc(&client->dev, radio->buf_size, GFP_KERNEL);
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if (!radio->buffer) {
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retval = -EIO;
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goto err_all;
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}
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/* rds buffer configuration */
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radio->wr_index = 0;
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radio->rd_index = 0;
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init_waitqueue_head(&radio->read_queue);
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retval = devm_request_threaded_irq(&client->dev, client->irq, NULL,
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si470x_i2c_interrupt,
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IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
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DRIVER_NAME, radio);
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if (retval) {
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dev_err(&client->dev, "Failed to register interrupt\n");
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goto err_all;
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}
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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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v4l2_ctrl_handler_free(&radio->hdl);
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v4l2_device_unregister(&radio->v4l2_dev);
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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 void 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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if (radio->gpio_reset)
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gpiod_set_value(radio->gpio_reset, 0);
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v4l2_ctrl_handler_free(&radio->hdl);
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v4l2_device_unregister(&radio->v4l2_dev);
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}
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#ifdef CONFIG_PM_SLEEP
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/*
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* si470x_i2c_suspend - suspend the device
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*/
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static int si470x_i2c_suspend(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct si470x_device *radio = i2c_get_clientdata(client);
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/* power down */
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radio->registers[POWERCFG] |= POWERCFG_DISABLE;
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if (si470x_set_register(radio, POWERCFG) < 0)
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return -EIO;
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return 0;
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}
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/*
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* si470x_i2c_resume - resume the device
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*/
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static int si470x_i2c_resume(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct si470x_device *radio = i2c_get_clientdata(client);
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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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return -EIO;
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msleep(110);
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return 0;
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}
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static SIMPLE_DEV_PM_OPS(si470x_i2c_pm, si470x_i2c_suspend, si470x_i2c_resume);
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#endif
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#if IS_ENABLED(CONFIG_OF)
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static const struct of_device_id si470x_of_match[] = {
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{ .compatible = "silabs,si470x" },
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|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, si470x_of_match);
|
|
#endif
|
|
|
|
/*
|
|
* si470x_i2c_driver - i2c driver interface
|
|
*/
|
|
static struct i2c_driver si470x_i2c_driver = {
|
|
.driver = {
|
|
.name = "si470x",
|
|
.of_match_table = of_match_ptr(si470x_of_match),
|
|
#ifdef CONFIG_PM_SLEEP
|
|
.pm = &si470x_i2c_pm,
|
|
#endif
|
|
},
|
|
.probe_new = si470x_i2c_probe,
|
|
.remove = si470x_i2c_remove,
|
|
.id_table = si470x_i2c_id,
|
|
};
|
|
|
|
module_i2c_driver(si470x_i2c_driver);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR(DRIVER_AUTHOR);
|
|
MODULE_DESCRIPTION(DRIVER_DESC);
|
|
MODULE_VERSION(DRIVER_VERSION);
|