336ea51af6
Should work(tm). But I don't have the hardware, so it needs to be tested. Change-Id: Ic086434f570dcddacb5b7e7a1acce4b8cafc5c03
128 lines
3.6 KiB
C
128 lines
3.6 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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*
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* Module wrapper for SI4709 FM Radio Chip, using /dev/si470x (si4709.ko)
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* Samsung YP-R0 & Samsung YP-R1
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*
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* Copyright (c) 2012 Lorenzo Miori
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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/* system includes */
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <linux/i2c-dev.h>
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#include "stdint.h"
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#include "string.h"
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/* application includes */
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#include "kernel.h"
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#include "radio-ypr.h"
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#include "power.h"
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#include "gpio-target.h"
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#include "gpio-ypr.h"
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#include "panic.h"
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#include "i2c-target.h"
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/* 7bits I2C address for Si4709
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* (apparently not selectable by pins or revisions) */
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#define SI4709_I2C_SLAVE_ADDR 0x10
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/** i2c file handle */
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static int radio_dev = -1;
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/* toggle radio RST pin */
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static void power_toggle(bool set)
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{
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/* setup the GPIO port, as in OF */
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gpio_set_iomux(GPIO_FM_BUS_EN, CONFIG_ALT3);
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gpio_set_pad(GPIO_FM_BUS_EN, PAD_CTL_SRE_FAST | PAD_CTL_DRV_HIGH);
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gpio_direction_output(GPIO_FM_BUS_EN);
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gpio_set(GPIO_FM_BUS_EN, set);
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}
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void radiodev_open(void)
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{
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int retval = -1; /* ioctl return value */
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/* open the I2C bus where the chip is attached to */
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radio_dev = open(I2C_BUS_FM_RADIO, O_RDWR);
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if (radio_dev == -1)
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{
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panicf("%s: failed to open /dev/i2c-1 device - %d", __FUNCTION__, retval);
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}
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else
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{
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/* device is open, go on */
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/* set the slave address for the handle.
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* Some other modules might have set the same slave address
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* e.g. another module. Let's do a I2C_SLAVE_FORCE which does
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* not care about looking for other init'ed i2c slaves */
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retval = ioctl(radio_dev, I2C_SLAVE_FORCE, SI4709_I2C_SLAVE_ADDR);
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if (retval == -1)
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{
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/* the ioctl call should never fail, if radio_dev is valid */
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panicf("%s: failed to set slave address - %d", __FUNCTION__, retval);
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}
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else
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{
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/* initialization completed */
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}
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}
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/* i2c subsystem ready, now toggle power to the chip */
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power_toggle(true);
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/* 100ms reset delay */
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sleep(HZ/10);
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}
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void radiodev_close(void)
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{
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/* power the chip down */
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power_toggle(false);
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/* close the i2c subsystem */
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if (radio_dev != -1)
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{
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(void)close(radio_dev);
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}
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else
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{
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/* not opened */
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}
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/* set back to safe error value */
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radio_dev = -1;
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}
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/* Low-level i2c channel access: write */
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int fmradio_i2c_write(unsigned char address, unsigned char* buf, int count)
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{
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(void)address;
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return write(radio_dev, buf, count);
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}
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/* Low-level i2c channel access: read */
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int fmradio_i2c_read(unsigned char address, unsigned char* buf, int count)
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{
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(void)address;
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return read(radio_dev, buf, count);
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}
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