sound/soc/codecs/tfa9887B_init.c

/*
 *Copyright 2014,2015 NXP Semiconductors
 *
 *Licensed under the Apache License, Version 2.0 (the "License");
 *you may not use this file except in compliance with the License.
 *You may obtain a copy of the License at
 *            
 *http://www.apache.org/licenses/LICENSE-2.0
 *             
 *Unless required by applicable law or agreed to in writing, software
 *distributed under the License is distributed on an "AS IS" BASIS,
 *WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *See the License for the specific language governing permissions and
 *limitations under the License.
 */
 
#include "tfa_dsp_fw.h"
#include "tfa_service.h"
#include "tfa_internal.h"

#include "tfa98xx_tfafieldnames.h"

#ifdef TFA98XX_FULL
/** clockless way to determine if this is the tfa9887
 *  by testing if the PVP bit is writable 
 */
int tfa9887B_is87(Tfa98xx_handle_t handle)
{
        unsigned short save_value, check_value;
		
	tfa98xx_read_register16(handle, 0x08, &save_value);
	if ( (save_value&0x0400) == 0 ) // if clear it's 87
		return 1;	
	/* try to clear pvp bit */
	tfa98xx_write_register16(handle, 0x08, (save_value & ~0x0400));
	tfa98xx_read_register16(handle, 0x08, &check_value);
	/* restore */
        tfa98xx_write_register16(handle, 0x08, save_value);
	/* could we write the bit */
	return (check_value!=save_value) ? 1 : 0; // if changed it's the 87
}
#endif

static enum Tfa98xx_Error tfa9887B_specific(Tfa98xx_handle_t handle)
{
        enum Tfa98xx_Error error = Tfa98xx_Error_Ok;
        int result;

        if (!tfa98xx_handle_is_open(handle))
                return Tfa98xx_Error_NotOpen;

        /* all i2C registers are already set to default */

        result = TFA_SET_BF(handle, AMPE, 1);
        if (result < 0)
        	return -result;

        /* some other registers must be set for optimal amplifier behaviour */
	tfa98xx_write_register16(handle, 0x05, 0x13AB);
	tfa98xx_write_register16(handle, 0x06, 0x001F);
	/* peak voltage protection is always on, but may be written */
	tfa98xx_write_register16(handle, 0x08, 0x3C4E);
	/*TFA98XX_SYSCTRL_DCA=0*/
	tfa98xx_write_register16(handle, 0x09, 0x024D);
	tfa98xx_write_register16(handle, 0x41, 0x0308);
        error = tfa98xx_write_register16(handle, 0x49, 0x0E82);

        return error;
}

/*
 * register device specifics functions
 */
void tfa9887B_ops(struct tfa_device_ops *ops) {
	ops->tfa_init=tfa9887B_specific;
}