23279cd43a
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@13620 a1c6a512-1295-4272-9138-f99709370657
195 lines
6.1 KiB
C
195 lines
6.1 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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* $Id$
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*
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* Driver for WM8751 audio codec
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*
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* Based on code from the ipodlinux project - http://ipodlinux.org/
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* Adapted for Rockbox in December 2005
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*
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* Original file: linux/arch/armnommu/mach-ipod/audio.c
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*
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* Copyright (c) 2003-2005 Bernard Leach (leachbj@bouncycastle.org)
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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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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#include "kernel.h"
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#include "wmcodec.h"
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#include "i2s.h"
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#include "audio.h"
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#include "audiohw.h"
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const struct sound_settings_info audiohw_settings[] = {
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[SOUND_VOLUME] = {"dB", 0, 1, -74, 6, -25},
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[SOUND_BASS] = {"dB", 1, 15, -60, 90, 0},
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[SOUND_TREBLE] = {"dB", 1, 15, -60, 90, 0},
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[SOUND_BALANCE] = {"%", 0, 1,-100, 100, 0},
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[SOUND_CHANNELS] = {"", 0, 1, 0, 5, 0},
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[SOUND_STEREO_WIDTH] = {"%", 0, 1, 0, 255, 100},
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};
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/* Flags used in combination with settings */
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/* use zero crossing to reduce clicks during volume changes */
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#define LOUT1_BITS (LOUT1_LO1ZC)
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/* latch left volume first then update left+right together */
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#define ROUT1_BITS (ROUT1_RO1ZC | ROUT1_RO1VU)
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#define LOUT2_BITS (LOUT2_LO2ZC)
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#define ROUT2_BITS (ROUT2_RO2ZC | ROUT2_RO2VU)
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/* We use linear bass control with 200 Hz cutoff */
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#define BASSCTRL_BITS (BASSCTRL_BC)
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/* We use linear treble control with 4 kHz cutoff */
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#define TREBCTRL_BITS (TREBCTRL_TC)
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/* convert tenth of dB volume (-730..60) to master volume register value */
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int tenthdb2master(int db)
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{
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/* +6 to -73dB 1dB steps (plus mute == 80levels) 7bits */
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/* 1111111 == +6dB (0x7f) */
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/* 1111001 == 0dB (0x79) */
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/* 0110000 == -73dB (0x30) */
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/* 0101111..0000000 == mute (<= 0x2f) */
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if (db < VOLUME_MIN)
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return 0x0;
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else
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return (db / 10) + 73 + 0x30;
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}
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/* convert tenth of dB volume (-780..0) to mixer volume register value */
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int tenthdb2mixer(int db)
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{
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(void)db;
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return 0;
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}
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static int tone_tenthdb2hw(int value)
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{
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/* -6.0db..+0db..+9.0db step 1.5db - translate -60..+0..+90 step 15
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to 10..6..0 step -1.
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*/
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value = 10 - (value + 60) / 15;
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if (value == 6)
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value = 0xf; /* 0db -> off */
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return value;
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}
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void audiohw_reset(void);
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/* Reset and power up the WM8751 */
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void audiohw_preinit(void)
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{
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/*
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* 1. Switch on power supplies.
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* By default the WM8751 is in Standby Mode, the DAC is
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* digitally muted and the Audio Interface, Line outputs
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* and Headphone outputs are all OFF (DACMU = 1 Power
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* Management registers 1 and 2 are all zeros).
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*/
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wmcodec_write(RESET, RESET_RESET); /*Reset*/
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/* 2. Enable Vmid and VREF. */
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wmcodec_write(PWRMGMT1, PWRMGMT1_VREF | PWRMGMT1_VMIDSEL_5K);
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/* BCLKINV=0(Dont invert BCLK) MS=1(Enable Master) LRSWAP=0 LRP=0 */
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/* IWL=00(16 bit) FORMAT=10(I2S format) */
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wmcodec_write(AINTFCE, AINTFCE_MS | AINTFCE_WL_16 |
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AINTFCE_FORMAT_I2S);
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}
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/* Enable DACs and audio output after a short delay */
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void audiohw_postinit(void)
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{
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/* From app notes: allow Vref to stabilize to reduce clicks */
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sleep(HZ);
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/* 3. Enable DACs as required. */
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wmcodec_write(PWRMGMT2, PWRMGMT2_DACL | PWRMGMT2_DACR);
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/* 4. Enable line and / or headphone output buffers as required. */
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wmcodec_write(PWRMGMT2, PWRMGMT2_DACL | PWRMGMT2_DACR |
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PWRMGMT2_LOUT1 | PWRMGMT2_ROUT1 | PWRMGMT2_LOUT2 |
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PWRMGMT2_ROUT2);
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wmcodec_write(LEFTMIX1, LEFTMIX1_LD2LO | LEFTMIX1_LI2LO_DEFAULT);
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wmcodec_write(RIGHTMIX2, RIGHTMIX2_RD2RO | RIGHTMIX2_RI2RO_DEFAULT);
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audiohw_mute(false);
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}
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int audiohw_set_master_vol(int vol_l, int vol_r)
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{
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/* +6 to -73dB 1dB steps (plus mute == 80levels) 7bits */
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/* 1111111 == +6dB */
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/* 1111001 == 0dB */
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/* 0110000 == -73dB */
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/* 0101111 == mute (0x2f) */
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wmcodec_write(LOUT1, LOUT1_BITS | LOUT1_LOUT1VOL(vol_l));
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wmcodec_write(ROUT1, ROUT1_BITS | ROUT1_ROUT1VOL(vol_r));
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return 0;
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}
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int audiohw_set_lineout_vol(int vol_l, int vol_r)
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{
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wmcodec_write(LOUT2, LOUT2_BITS | LOUT2_LOUT2VOL(vol_l));
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wmcodec_write(ROUT2, ROUT2_BITS | ROUT2_ROUT2VOL(vol_r));
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return 0;
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}
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int audiohw_set_mixer_vol(int channel1, int channel2)
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{
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(void)channel1;
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(void)channel2;
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return 0;
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}
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void audiohw_set_bass(int value)
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{
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wmcodec_write(BASSCTRL, BASSCTRL_BITS |
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BASSCTRL_BASS(tone_tenthdb2hw(value)));
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}
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void audiohw_set_treble(int value)
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{
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wmcodec_write(TREBCTRL, TREBCTRL_BITS |
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TREBCTRL_TREB(tone_tenthdb2hw(value)));
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}
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void audiohw_mute(int mute)
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{
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/* Mute: Set DACMU = 1 to soft-mute the audio DACs. */
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/* Unmute: Set DACMU = 0 to soft-un-mute the audio DACs. */
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wmcodec_write(DACCTRL, mute ? DACCTRL_DACMU : 0);
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}
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/* Nice shutdown of WM8751 codec */
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void audiohw_close(void)
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{
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/* 1. Set DACMU = 1 to soft-mute the audio DACs. */
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audiohw_mute(true);
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/* 2. Disable all output buffers. */
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wmcodec_write(PWRMGMT2, 0x0);
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/* 3. Switch off the power supplies. */
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wmcodec_write(PWRMGMT1, 0x0);
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}
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/* Note: Disable output before calling this function */
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void audiohw_set_frequency(int fsel)
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{
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wmcodec_write(CLOCKING, fsel);
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}
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