ALSA: ice1724: ESI W192M: Add sampling rate control of the ADC/DAC

Add sampling rate control for ADC/DAC for ESI W192M.
Allow to switch between 48K/96K/192K sampling rate.
All DAC need to be mute when changing samplerate.

Signed-off-by: Clément Guedez <klem.dev@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 107 insertions, 0 deletions

diff --git a/sound/pci/ice1712/wtm.c b/sound/pci/ice1712/wtm.c
index 6d3412f72855..9906119e0954 100644
--- a/sound/pci/ice1712/wtm.c
+++ b/sound/pci/ice1712/wtm.c
@@ -30,12 +30,18 @@
 #include <linux/init.h>
 #include <sound/core.h>
 #include <sound/tlv.h>
+#include <linux/slab.h>
 
 #include "ice1712.h"
 #include "envy24ht.h"
 #include "wtm.h"
 #include "stac946x.h"
 
+struct wtm_spec {
+        /* rate change needs atomic mute/unmute of all dacs*/
+        struct mutex mute_mutex;
+};
+
 
 /*
  *      2*ADC 6*DAC no1 ringbuffer r/w on i2c bus
@@ -69,15 +75,65 @@ static inline unsigned char stac9460_2_get(struct snd_ice1712 *ice, int reg)
 /*
  *      DAC mute control
  */
+static void stac9460_dac_mute_all(struct snd_ice1712 *ice, unsigned char mute,
+                                unsigned short int *change_mask)
+{
+        unsigned char new, old;
+        int id, idx, change;
+
+        /*stac9460 1*/
+        for (id = 0; id < 7; id++) {
+                if (*change_mask & (0x01 << id)) {
+                        if (id == 0)
+                                idx = STAC946X_MASTER_VOLUME;
+                        else
+                                idx = STAC946X_LF_VOLUME - 1 + id;
+                        old = stac9460_get(ice, idx);
+                        new = (~mute << 7 & 0x80) | (old & ~0x80);
+                        change = (new != old);
+                        if (change) {
+                                stac9460_put(ice, idx, new);
+                                *change_mask = *change_mask | (0x01 << id);
+                        } else {
+                                *change_mask = *change_mask & ~(0x01 << id);
+                        }
+                }
+        }
+
+        /*stac9460 2*/
+        for (id = 0; id < 3; id++) {
+                if (*change_mask & (0x01 << (id + 7))) {
+                        if (id == 0)
+                                idx = STAC946X_MASTER_VOLUME;
+                        else
+                                idx = STAC946X_LF_VOLUME - 1 + id;
+                        old = stac9460_2_get(ice, idx);
+                        new = (~mute << 7 & 0x80) | (old & ~0x80);
+                        change = (new != old);
+                        if (change) {
+                                stac9460_2_put(ice, idx, new);
+                                *change_mask = *change_mask | (0x01 << id);
+                        } else {
+                                *change_mask = *change_mask & ~(0x01 << id);
+                        }
+                }
+        }
+}
+
+
+
 #define stac9460_dac_mute_info          snd_ctl_boolean_mono_info
 
 static int stac9460_dac_mute_get(struct snd_kcontrol *kcontrol,
                                 struct snd_ctl_elem_value *ucontrol)
 {
         struct snd_ice1712 *ice = snd_kcontrol_chip(kcontrol);
+        struct wtm_spec *spec = ice->spec;
         unsigned char val;
         int idx, id;
 
+        mutex_lock(&spec->mute_mutex);
+
         if (kcontrol->private_value) {
                 idx = STAC946X_MASTER_VOLUME;
                 id = 0;
@@ -90,6 +146,8 @@ static int stac9460_dac_mute_get(struct snd_kcontrol *kcontrol,
         else
                 val = stac9460_2_get(ice, idx - 6);
         ucontrol->value.integer.value[0] = (~val >> 7) & 0x1;
+
+        mutex_unlock(&spec->mute_mutex);
         return 0;
 }
 
@@ -388,6 +446,44 @@ static int stac9460_mic_sw_put(struct snd_kcontrol *kcontrol,
 }
 
 
+/*
+ * Handler for setting correct codec rate - called when rate change is detected
+ */
+static void stac9460_set_rate_val(struct snd_ice1712 *ice, unsigned int rate)
+{
+        unsigned char old, new;
+        unsigned short int changed;
+        struct wtm_spec *spec = ice->spec;
+
+        if (rate == 0)  /* no hint - S/PDIF input is master, simply return */
+                return;
+        else if (rate <= 48000)
+                new = 0x08;     /* 256x, base rate mode */
+        else if (rate <= 96000)
+                new = 0x11;     /* 256x, mid rate mode */
+        else
+                new = 0x12;     /* 128x, high rate mode */
+
+        old = stac9460_get(ice, STAC946X_MASTER_CLOCKING);
+        if (old == new)
+                return;
+        /* change detected, setting master clock, muting first */
+        /* due to possible conflicts with mute controls - mutexing */
+        mutex_lock(&spec->mute_mutex);
+        /* we have to remember current mute status for each DAC */
+        changed = 0xFFFF;
+        stac9460_dac_mute_all(ice, 0, &changed);
+        /*printk(KERN_DEBUG "Rate change: %d, new MC: 0x%02x\n", rate, new);*/
+        stac9460_put(ice, STAC946X_MASTER_CLOCKING, new);
+        stac9460_2_put(ice, STAC946X_MASTER_CLOCKING, new);
+        udelay(10);
+        /* unmuting - only originally unmuted dacs -
+        * i.e. those changed when muting */
+        stac9460_dac_mute_all(ice, 1, &changed);
+        mutex_unlock(&spec->mute_mutex);
+}
+
+
 /*Limits value in dB for fader*/
 static const DECLARE_TLV_DB_SCALE(db_scale_dac, -19125, 75, 0);
 static const DECLARE_TLV_DB_SCALE(db_scale_adc, 0, 150, 0);
@@ -487,21 +583,32 @@ static int wtm_init(struct snd_ice1712 *ice)
 {
         static unsigned short stac_inits_wtm[] = {
                 STAC946X_RESET, 0,
+                STAC946X_MASTER_CLOCKING, 0x11,
                 (unsigned short)-1
         };
         unsigned short *p;
+        struct wtm_spec *spec;
 
         /*WTM 192M*/
         ice->num_total_dacs = 8;
         ice->num_total_adcs = 4;
         ice->force_rdma1 = 1;
 
+        /*init mutex for dac mute conflict*/
+        spec = kzalloc(sizeof(*spec), GFP_KERNEL);
+        if (!spec)
+                return -ENOMEM;
+        ice->spec = spec;
+        mutex_init(&spec->mute_mutex);
+
+
         /*initialize codec*/
         p = stac_inits_wtm;
         for (; *p != (unsigned short)-1; p += 2) {
                 stac9460_put(ice, p[0], p[1]);
                 stac9460_2_put(ice, p[0], p[1]);
         }
+        ice->gpio.set_pro_rate = stac9460_set_rate_val;
         return 0;
 }