1 files changed, 318 insertions, 0 deletions

diff --git a/firmware/drivers/audio/wm8975.c b/firmware/drivers/audio/wm8975.c
new file mode 100644
index 0000000000..9052236131
--- /dev/null
+++ b/firmware/drivers/audio/wm8975.c
@@ -0,0 +1,318 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Driver for WM8975 audio codec
+ *
+ * Based on code from the ipodlinux project - http://ipodlinux.org/
+ * Adapted for Rockbox in December 2005
+ *
+ * Original file: linux/arch/armnommu/mach-ipod/audio.c
+ *
+ * Copyright (c) 2003-2005 Bernard Leach (leachbj@bouncycastle.org)
+ *
+ * All files in this archive are subject to the GNU General Public License.
+ * See the file COPYING in the source tree root for full license agreement.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#include "lcd.h"
+#include "cpu.h"
+#include "kernel.h"
+#include "thread.h"
+#include "power.h"
+#include "debug.h"
+#include "system.h"
+#include "sprintf.h"
+#include "button.h"
+#include "string.h"
+#include "file.h"
+#include "buffer.h"
+#include "audio.h"
+
+#include "wmcodec.h"
+#include "wm8975.h"
+#include "i2s.h"
+
+/* use zero crossing to reduce clicks during volume changes */
+#define VOLUME_ZC_WAIT (1<<7)
+
+
+
+/* convert tenth of dB volume (-730..60) to master volume register value */
+int tenthdb2master(int db)
+{
+    /* +6 to -73dB 1dB steps (plus mute == 80levels) 7bits */
+    /* 1111111 == +6dB  (0x7f) */
+    /* 1111001 == 0dB   (0x79) */
+    /* 0110000 == -73dB (0x30 */
+    /* 0101111..0000000 == mute  (0x2f) */
+
+    if (db < VOLUME_MIN) {
+        return 0x0;
+    } else {
+        return((db/10)+73+0x30);
+    }
+}
+
+/* convert tenth of dB volume (-780..0) to mixer volume register value */
+int tenthdb2mixer(int db)
+{
+    (void)db;
+    return 0;
+}
+
+
+void audiohw_reset(void);
+
+#define IPOD_PCM_LEVEL 0x65       /* -6dB */
+
+
+/* Silently enable / disable audio output */
+void audiohw_enable_output(bool enable)
+{
+    if (enable) 
+    {
+        /* reset the I2S controller into known state */
+        i2s_reset();
+
+        /*
+         * 1. Switch on power supplies.
+         *    By default the WM8750L is in Standby Mode, the DAC is
+         *    digitally muted and the Audio Interface, Line outputs
+         *    and Headphone outputs are all OFF (DACMU = 1 Power
+         *    Management registers 1 and 2 are all zeros).
+         */
+        wmcodec_write(RESET, 0x1ff);    /*Reset*/
+        wmcodec_write(RESET, 0x0);
+    
+         /* 2. Enable Vmid and VREF. */
+        wmcodec_write(PWRMGMT1, 0xc0);    /*Pwr Mgmt(1)*/
+
+        /* From app notes: allow Vref to stabilize to reduce clicks */
+        sleep(HZ/4);
+    
+         /* 3. Enable DACs as required. */
+        wmcodec_write(PWRMGMT2, 0x180);    /*Pwr Mgmt(2)*/
+    
+         /* 4. Enable line and / or headphone output buffers as required. */
+        wmcodec_write(PWRMGMT2, 0x1f8);    /*Pwr Mgmt(2)*/
+    
+        /* BCLKINV=0(Dont invert BCLK) MS=1(Enable Master) LRSWAP=0 LRP=0 */
+        /* IWL=00(16 bit) FORMAT=10(I2S format) */
+        wmcodec_write(AINTFCE, 0x42);
+    
+        /* The iPod can handle multiple frequencies, but fix at 44.1KHz for now */
+        audiohw_set_sample_rate(WM8975_44100HZ);
+    
+        /* set the volume to -6dB */
+        wmcodec_write(LOUT1VOL, VOLUME_ZC_WAIT | IPOD_PCM_LEVEL);
+        wmcodec_write(ROUT1VOL, VOLUME_ZC_WAIT | 0x100 | IPOD_PCM_LEVEL);
+
+        wmcodec_write(LOUTMIX1, 0x150);    /* Left out Mix(def) */
+        wmcodec_write(LOUTMIX2, 0x50);
+    
+        wmcodec_write(ROUTMIX1, 0x50);    /* Right out Mix(def) */
+        wmcodec_write(ROUTMIX2, 0x150);
+    
+        wmcodec_write(MOUTMIX1, 0x0);     /* Mono out Mix */
+        wmcodec_write(MOUTMIX2, 0x0);
+
+        audiohw_mute(0);
+    } else {
+        audiohw_mute(1);
+    }
+}
+
+
+
+int audiohw_set_master_vol(int vol_l, int vol_r)
+{
+    /* +6 to -73dB 1dB steps (plus mute == 80levels) 7bits */
+    /* 1111111 == +6dB */
+    /* 1111001 == 0dB */
+    /* 0110000 == -73dB */
+    /* 0101111 == mute (0x2f) */
+
+    /* OUT1 */
+    wmcodec_write(LOUT1VOL, VOLUME_ZC_WAIT | vol_l);
+    wmcodec_write(ROUT1VOL, VOLUME_ZC_WAIT | 0x100 | vol_r);
+
+    return 0;
+}
+
+int audiohw_set_lineout_vol(int vol_l, int vol_r)
+{
+    /* OUT2 */
+    wmcodec_write(LOUT2VOL, VOLUME_ZC_WAIT | vol_l);
+    wmcodec_write(ROUT2VOL, VOLUME_ZC_WAIT | 0x100 | vol_r);
+
+    return 0;
+}
+
+int audiohw_set_mixer_vol(int channel1, int channel2)
+{
+    (void)channel1;
+    (void)channel2;
+
+    return 0;
+}
+
+void audiohw_set_bass(int value)
+{
+    const int regvalues[] = {
+        11, 10, 10, 9, 8, 8, 0xf, 6, 6, 5, 4, 4, 3, 2, 1, 0
+    };
+
+    if ((value >= -6) && (value <= 9)) {
+        /* We use linear bass control with 200 Hz cutoff */
+        wmcodec_write(BASSCTRL, regvalues[value + 6] | 0x40);
+    }
+}
+
+void audiohw_set_treble(int value)
+{
+    const int regvalues[] = {
+        11, 10, 10, 9, 8, 8, 0xf, 6, 6, 5, 4, 4, 3, 2, 1, 0
+    };
+
+    if ((value >= -6) && (value <= 9)) {
+        /* We use linear treble control with 4 kHz cutoff */
+        wmcodec_write(TREBCTRL, regvalues[value + 6] | 0x40);
+    }
+}
+
+int audiohw_mute(int mute)
+{
+    if (mute)
+    {
+        /* Set DACMU = 1 to soft-mute the audio DACs. */
+        wmcodec_write(DACCTRL, 0x8);
+    } else {
+        /* Set DACMU = 0 to soft-un-mute the audio DACs. */
+        wmcodec_write(DACCTRL, 0x0);
+    }
+
+    return 0;
+}
+
+/* Nice shutdown of WM8975 codec */
+void audiohw_close(void)
+{
+    /* 1. Set DACMU = 1 to soft-mute the audio DACs. */
+    wmcodec_write(DACCTRL, 0x8);
+
+    /* 2. Disable all output buffers. */
+    wmcodec_write(PWRMGMT2, 0x0);     /*Pwr Mgmt(2)*/
+
+    /* 3. Switch off the power supplies. */
+    wmcodec_write(PWRMGMT1, 0x0);     /*Pwr Mgmt(1)*/
+}
+
+/* Change the order of the noise shaper, 5th order is recommended above 32kHz */
+void audiohw_set_nsorder(int order)
+{
+    (void)order;
+}
+
+/* Note: Disable output before calling this function */
+void audiohw_set_sample_rate(int sampling_control) {
+
+  wmcodec_write(0x08, sampling_control);
+
+}
+
+void audiohw_enable_recording(bool source_mic)
+{
+     (void)source_mic;
+
+    /* reset the I2S controller into known state */
+    i2s_reset();
+
+    /*
+     * 1. Switch on power supplies.
+     *    By default the WM8750L is in Standby Mode, the DAC is
+     *    digitally muted and the Audio Interface, Line outputs
+     *    and Headphone outputs are all OFF (DACMU = 1 Power
+     *    Management registers 1 and 2 are all zeros).
+     */
+    wmcodec_write(0x0f, 0x1ff);
+    wmcodec_write(0x0f, 0x000);
+
+     /* 2. Enable Vmid and VREF. */
+    wmcodec_write(0x19, 0xc0);               /*Pwr Mgmt(1)*/
+
+     /* 3. Enable ADCs as required. */
+    wmcodec_write(0x19, 0xcc);               /*Pwr Mgmt(1)*/
+    wmcodec_write(0x1a, 0x180);              /*Pwr Mgmt(2)*/
+
+     /* 4. Enable line and / or headphone output buffers as required. */
+    wmcodec_write(0x19, 0xfc);               /*Pwr Mgmt(1)*/
+
+    /* BCLKINV=0(Dont invert BCLK) MS=1(Enable Master) LRSWAP=0 LRP=0 */
+    /* IWL=00(16 bit) FORMAT=10(I2S format) */
+    wmcodec_write(0x07, 0x42);
+
+    /* The iPod can handle multiple frequencies, but fix at 44.1KHz for now */
+    audiohw_set_sample_rate(WM8975_44100HZ);
+
+    /* unmute inputs */
+    wmcodec_write(0x00, 0x17);               /* LINVOL (def 0dB) */
+    wmcodec_write(0x01, 0x117);              /* RINVOL (def 0dB) */
+
+    wmcodec_write(0x15, 0x1d7);                /* LADCVOL max vol x was ff */
+    wmcodec_write(0x16, 0x1d7);                /* RADCVOL max vol x was ff */
+
+    if (source_mic) {
+        /* VSEL=10(def) DATSEL=10 (use right ADC only) */
+        wmcodec_write(0x17, 0xc9);                 /* Additional control(1) */
+
+        /* VROI=1 (sets output resistance to 40kohms) */
+        wmcodec_write(0x1b, 0x40);                 /* Additional control(3) */
+
+        /* LINSEL=1 (LINPUT2) LMICBOOST=10 (20dB boost) */
+        wmcodec_write(0x20, 0x60);               /* ADCL signal path */
+        wmcodec_write(0x21, 0x60);               /* ADCR signal path */
+    } else {
+        /* VSEL=10(def) DATSEL=00 (left->left, right->right) */
+        wmcodec_write(0x17, 0xc1);                 /* Additional control(1) */
+
+        /* VROI=1 (sets output resistance to 40kohms) */
+        wmcodec_write(0x1b, 0x40);                 /* Additional control(3) */
+
+        /* LINSEL=0 (LINPUT1) LMICBOOST=00 (bypass boost) */
+        wmcodec_write(0x20, 0x00);               /* ADCL signal path */
+        /* RINSEL=0 (RINPUT1) RMICBOOST=00 (bypass boost) */
+        wmcodec_write(0x21, 0x00);               /* ADCR signal path */
+    }
+}
+ 
+void audiohw_disable_recording(void) {
+    /* 1. Set DACMU = 1 to soft-mute the audio DACs. */
+    wmcodec_write(0x05, 0x8);
+
+    /* 2. Disable all output buffers. */
+    wmcodec_write(0x1a, 0x0);        /*Pwr Mgmt(2)*/
+
+    /* 3. Switch off the power supplies. */
+    wmcodec_write(0x19, 0x0);        /*Pwr Mgmt(1)*/
+}
+
+void audiohw_set_recvol(int left, int right, int type) {
+
+    (void)left;
+    (void)right;
+    (void)type;
+}
+
+void audiohw_set_monitor(int enable) {
+
+    (void)enable;
+}