On Tue, 2006-09-19 at 14:52 +0200, Takashi Iwai wrote:
>
> Note that some people don't like "if ((a = b) < 0)" style, so better
> to write in two lines, "a = b; if (a < 0) ...", for avoiding
> unnecessary flames in general for the new codes.
>
Np, I prefer the "if((a = b) < 0)" style, but don't want to start any
flames ;)
Btw, we may need to update the online alsa docs to reflect this :-
http://www.alsa-project.org/~iwai/writing-an-alsa-driver/x1026.htm
All other changes made.
Signed-off-by: Richard Purdie <rpurdie@xxxxxxxxx>
Signed-off-by: Liam Girdwood <liam.girdwood@xxxxxxxxxxxxxxxx>
Liam
Index: alsa-kernel/soc/soc-dapm.c
===================================================================
--- /dev/null
+++ alsa-kernel/soc/soc-dapm.c
@@ -0,0 +1,1327 @@
+/*
+ * soc-dapm.c -- ALSA SoC Dynamic Audio Power Management
+ *
+ * Copyright 2005 Wolfson Microelectronics PLC.
+ * Author: Liam Girdwood
+ * liam.girdwood@xxxxxxxxxxxxxxxx or linux@xxxxxxxxxxxxxxxx
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * Revision history
+ * 12th Aug 2005 Initial version.
+ * 25th Oct 2005 Implemented path power domain.
+ * 18th Dec 2005 Implemented machine and stream level power domain.
+ *
+ * Features:
+ * o Changes power status of internal codec blocks depending on the
+ * dynamic configuration of codec internal audio paths and active
+ * DAC's/ADC's.
+ * o Platform power domain - can support external components i.e. amps and
+ * mic/meadphone insertion events.
+ * o Automatic Mic Bias support
+ * o Jack insertion power event initiation - e.g. hp insertion will enable
+ * sinks, dacs, etc
+ * o Delayed powerdown of audio susbsytem to reduce pops between a quick
+ * device reopen.
+ *
+ * Todo:
+ * o DAPM power change sequencing - allow for configurable per
+ * codec sequences.
+ * o Support for analogue bias optimisation.
+ * o Support for reduced codec oversampling rates.
+ * o Support for reduced codec bias currents.
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/pm.h>
+#include <linux/bitops.h>
+#include <linux/platform_device.h>
+#include <linux/jiffies.h>
+#include <sound/driver.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc-dapm.h>
+#include <sound/initval.h>
+
+/* debug */
+#define DAPM_DEBUG 0
+#if DAPM_DEBUG
+#define dump_dapm(codec, action) dbg_dump_dapm(codec, action)
+#define dbg(format, arg...) printk(format, ## arg)
+#else
+#define dump_dapm(codec, action)
+#define dbg(format, arg...)
+#endif
+
+#define POP_DEBUG 0
+#if POP_DEBUG
+#define POP_TIME 500 /* 500 msecs - change if pop debug is too fast */
+#define pop_wait(time) schedule_timeout_interruptible(msecs_to_jiffies(time))
+#define pop_dbg(format, arg...) printk(format, ## arg); pop_wait(POP_TIME)
+#else
+#define pop_dbg(format, arg...)
+#define pop_wait(time)
+#endif
+
+/* dapm power sequences - make this per codec in the future */
+static int dapm_up_seq[] = {
+ snd_soc_dapm_pre, snd_soc_dapm_micbias, snd_soc_dapm_mic,
+ snd_soc_dapm_mux, snd_soc_dapm_dac, snd_soc_dapm_mixer, snd_soc_dapm_pga,
+ snd_soc_dapm_adc, snd_soc_dapm_hp, snd_soc_dapm_spk, snd_soc_dapm_post
+};
+static int dapm_down_seq[] = {
+ snd_soc_dapm_pre, snd_soc_dapm_adc, snd_soc_dapm_hp, snd_soc_dapm_spk,
+ snd_soc_dapm_pga, snd_soc_dapm_mixer, snd_soc_dapm_dac, snd_soc_dapm_mic,
+ snd_soc_dapm_micbias, snd_soc_dapm_mux, snd_soc_dapm_post
+};
+
+static int dapm_status = 1;
+module_param(dapm_status, int, 0);
+MODULE_PARM_DESC(dapm_status, "enable DPM sysfs entries");
+
+/* create a new dapm widget */
+static struct snd_soc_dapm_widget *dapm_cnew_widget(
+ const struct snd_soc_dapm_widget *_widget)
+{
+ struct snd_soc_dapm_widget* widget;
+ widget = kmalloc(sizeof(struct snd_soc_dapm_widget), GFP_KERNEL);
+ if (!widget)
+ return NULL;
+
+ memcpy(widget, _widget, sizeof(struct snd_soc_dapm_widget));
+ return widget;
+}
+
+/* set up initial codec paths */
+static void dapm_set_path_status(struct snd_soc_dapm_widget *w,
+ struct snd_soc_dapm_path *p, int i)
+{
+ switch (w->id) {
+ case snd_soc_dapm_switch:
+ case snd_soc_dapm_mixer: {
+ int val;
+ int reg = w->kcontrols[i].private_value & 0xff;
+ int shift = (w->kcontrols[i].private_value >> 8) & 0x0f;
+ int mask = (w->kcontrols[i].private_value >> 16) & 0xff;
+ int invert = (w->kcontrols[i].private_value >> 24) & 0x01;
+
+ val = snd_soc_read(w->codec, reg);
+ val = (val >> shift) & mask;
+
+ if ((invert && !val) || (!invert && val))
+ p->connect = 1;
+ else
+ p->connect = 0;
+ }
+ break;
+ case snd_soc_dapm_mux: {
+ struct soc_enum *e = (struct soc_enum *)w->kcontrols[i].private_value;
+ int val, item, bitmask;
+
+ for (bitmask = 1; bitmask < e->mask; bitmask <<= 1)
+ ;
+ val = snd_soc_read(w->codec, e->reg);
+ item = (val >> e->shift_l) & (bitmask - 1);
+
+ p->connect = 0;
+ for (i = 0; i < e->mask; i++) {
+ if (!(strcmp(p->name, e->texts[i])) && item == i)
+ p->connect = 1;
+ }
+ }
+ break;
+ /* does not effect routing - always connected */
+ case snd_soc_dapm_pga:
+ case snd_soc_dapm_output:
+ case snd_soc_dapm_adc:
+ case snd_soc_dapm_input:
+ case snd_soc_dapm_dac:
+ case snd_soc_dapm_micbias:
+ case snd_soc_dapm_vmid:
+ p->connect = 1;
+ break;
+ /* does effect routing - dynamically connected */
+ case snd_soc_dapm_hp:
+ case snd_soc_dapm_mic:
+ case snd_soc_dapm_spk:
+ case snd_soc_dapm_line:
+ case snd_soc_dapm_pre:
+ case snd_soc_dapm_post:
+ p->connect = 0;
+ break;
+ }
+}
+
+/* connect mux widget to it's interconnecting audio paths */
+static int dapm_connect_mux(struct snd_soc_codec *codec,
+ struct snd_soc_dapm_widget *src, struct snd_soc_dapm_widget *dest,
+ struct snd_soc_dapm_path *path, const char *control_name,
+ const struct snd_kcontrol_new *kcontrol)
+{
+ struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
+ int i;
+
+ for (i = 0; i < e->mask; i++) {
+ if (!(strcmp(control_name, e->texts[i]))) {
+ list_add(&path->list, &codec->dapm_paths);
+ list_add(&path->list_sink, &dest->sources);
+ list_add(&path->list_source, &src->sinks);
+ path->name = (char*)e->texts[i];
+ dapm_set_path_status(dest, path, 0);
+ return 0;
+ }
+ }
+
+ return -ENODEV;
+}
+
+/* connect mixer widget to it's interconnecting audio paths */
+static int dapm_connect_mixer(struct snd_soc_codec *codec,
+ struct snd_soc_dapm_widget *src, struct snd_soc_dapm_widget *dest,
+ struct snd_soc_dapm_path *path, const char *control_name)
+{
+ int i;
+
+ /* search for mixer kcontrol */
+ for (i = 0; i < dest->num_kcontrols; i++) {
+ if (!strcmp(control_name, dest->kcontrols[i].name)) {
+ list_add(&path->list, &codec->dapm_paths);
+ list_add(&path->list_sink, &dest->sources);
+ list_add(&path->list_source, &src->sinks);
+ path->name = dest->kcontrols[i].name;
+ dapm_set_path_status(dest, path, i);
+ return 0;
+ }
+ }
+ return -ENODEV;
+}
+
+/* update dapm codec register bits */
+static int dapm_update_bits(struct snd_soc_dapm_widget *widget)
+{
+ int change, power;
+ unsigned short old, new;
+ struct snd_soc_codec *codec = widget->codec;
+
+ /* check for valid widgets */
+ if (widget->reg < 0 || widget->id == snd_soc_dapm_input ||
+ widget->id == snd_soc_dapm_output ||
+ widget->id == snd_soc_dapm_hp ||
+ widget->id == snd_soc_dapm_mic ||
+ widget->id == snd_soc_dapm_line ||
+ widget->id == snd_soc_dapm_spk)
+ return 0;
+
+ power = widget->power;
+ if (widget->invert)
+ power = (power ? 0:1);
+
+ old = snd_soc_read(codec, widget->reg);
+ new = (old & ~(0x1 << widget->shift)) | (power << widget->shift);
+
+ change = old != new;
+ if (change) {
+ pop_dbg("pop test %s : %s in %d ms\n", widget->name,
+ widget->power ? "on" : "off", POP_TIME);
+ snd_soc_write(codec, widget->reg, new);
+ pop_wait(POP_TIME);
+ }
+ dbg("reg old %x new %x change %d\n", old, new, change);
+ return change;
+}
+
+/* ramps the volume up or down to minimise pops before or after a
+ * DAPM power event */
+static int dapm_set_pga(struct snd_soc_dapm_widget *widget, int power)
+{
+ const struct snd_kcontrol_new *k = widget->kcontrols;
+
+ if (widget->muted && !power)
+ return 0;
+ if (!widget->muted && power)
+ return 0;
+
+ if (widget->num_kcontrols && k) {
+ int reg = k->private_value & 0xff;
+ int shift = (k->private_value >> 8) & 0x0f;
+ int mask = (k->private_value >> 16) & 0xff;
+ int invert = (k->private_value >> 24) & 0x01;
+
+ if (power) {
+ int i;
+ /* power up has happended, increase volume to last level */
+ if (invert) {
+ for (i = mask; i > widget->saved_value; i--)
+ snd_soc_update_bits(widget->codec, reg, mask, i);
+ } else {
+ for (i = 0; i < widget->saved_value; i++)
+ snd_soc_update_bits(widget->codec, reg, mask, i);
+ }
+ widget->muted = 0;
+ } else {
+ /* power down is about to occur, decrease volume to mute */
+ int val = snd_soc_read(widget->codec, reg);
+ int i = widget->saved_value = (val >> shift) & mask;
+ if (invert) {
+ for (; i < mask; i++)
+ snd_soc_update_bits(widget->codec, reg, mask, i);
+ } else {
+ for (; i > 0; i--)
+ snd_soc_update_bits(widget->codec, reg, mask, i);
+ }
+ widget->muted = 1;
+ }
+ }
+ return 0;
+}
+
+/* create new dapm mixer control */
+static int dapm_new_mixer(struct snd_soc_codec *codec,
+ struct snd_soc_dapm_widget *w)
+{
+ int i, ret = 0;
+ char name[32];
+ struct snd_soc_dapm_path *path;
+
+ /* add kcontrol */
+ for (i = 0; i < w->num_kcontrols; i++) {
+
+ /* match name */
+ list_for_each_entry(path, &w->sources, list_sink) {
+
+ /* mixer/mux paths name must match control name */
+ if (path->name != (char*)w->kcontrols[i].name)
+ continue;
+
+ /* add dapm control with long name */
+ snprintf(name, 32, "%s %s", w->name, w->kcontrols[i].name);
+ path->long_name = kstrdup (name, GFP_KERNEL);
+ if (path->long_name == NULL)
+ return -ENOMEM;
+
+ path->kcontrol = snd_soc_cnew(&w->kcontrols[i], w,
+ path->long_name);
+ ret = snd_ctl_add(codec->card, path->kcontrol);
+ if (ret < 0) {
+ printk(KERN_ERR "asoc: failed to add dapm kcontrol %s\n",
+ path->long_name);
+ kfree(path->long_name);
+ path->long_name = NULL;
+ return ret;
+ }
+ }
+ }
+ return ret;
+}
+
+/* create new dapm mux control */
+static int dapm_new_mux(struct snd_soc_codec *codec,
+ struct snd_soc_dapm_widget *w)
+{
+ struct snd_soc_dapm_path *path = NULL;
+ struct snd_kcontrol *kcontrol;
+ int ret = 0;
+
+ if (!w->num_kcontrols) {
+ printk(KERN_ERR "asoc: mux %s has no controls\n", w->name);
+ return -EINVAL;
+ }
+
+ kcontrol = snd_soc_cnew(&w->kcontrols[0], w, w->name);
+ ret = snd_ctl_add(codec->card, kcontrol);
+ if (ret < 0)
+ goto err;
+
+ list_for_each_entry(path, &w->sources, list_sink)
+ path->kcontrol = kcontrol;
+
+ return ret;
+
+err:
+ printk(KERN_ERR "asoc: failed to add kcontrol %s\n", w->name);
+ return ret;
+}
+
+/* create new dapm volume control */
+static int dapm_new_pga(struct snd_soc_codec *codec,
+ struct snd_soc_dapm_widget *w)
+{
+ struct snd_kcontrol *kcontrol;
+ int ret = 0;
+
+ if (!w->num_kcontrols)
+ return -EINVAL;
+
+ kcontrol = snd_soc_cnew(&w->kcontrols[0], w, w->name);
+ ret = snd_ctl_add(codec->card, kcontrol);
+ if (ret < 0) {
+ printk(KERN_ERR "asoc: failed to add kcontrol %s\n", w->name);
+ return ret;
+ }
+
+ return ret;
+}
+
+/* reset 'walked' bit for each dapm path */
+static inline void dapm_clear_walk(struct snd_soc_codec *codec)
+{
+ struct snd_soc_dapm_path *p;
+
+ list_for_each_entry(p, &codec->dapm_paths, list)
+ p->walked = 0;
+}
+
+/*
+ * Recursively check for a completed path to an active or physically connected
+ * output widget. Returns number of complete paths.
+ */
+static int is_connected_output_ep(struct snd_soc_dapm_widget *widget)
+{
+ struct snd_soc_dapm_path *path;
+ int con = 0;
+
+ if (widget->id == snd_soc_dapm_adc && widget->active)
+ return 1;
+
+ if (widget->connected) {
+ /* connected pin ? */
+ if (widget->id == snd_soc_dapm_output && !widget->ext)
+ return 1;
+
+ /* connected jack or spk ? */
+ if (widget->id == snd_soc_dapm_hp || widget->id == snd_soc_dapm_spk ||
+ widget->id == snd_soc_dapm_line)
+ return 1;
+ }
+
+ list_for_each_entry(path, &widget->sinks, list_source) {
+ if (path->walked)
+ continue;
+
+ if (path->sink && path->connect) {
+ path->walked = 1;
+ con += is_connected_output_ep(path->sink);
+ }
+ }
+
+ return con;
+}
+
+/*
+ * Recursively check for a completed path to an active or physically connected
+ * input widget. Returns number of complete paths.
+ */
+static int is_connected_input_ep(struct snd_soc_dapm_widget *widget)
+{
+ struct snd_soc_dapm_path *path;
+ int con = 0;
+
+ /* active stream ? */
+ if (widget->id == snd_soc_dapm_dac && widget->active)
+ return 1;
+
+ if (widget->connected) {
+ /* connected pin ? */
+ if (widget->id == snd_soc_dapm_input && !widget->ext)
+ return 1;
+
+ /* connected VMID/Bias for lower pops */
+ if (widget->id == snd_soc_dapm_vmid)
+ return 1;
+
+ /* connected jack ? */
+ if (widget->id == snd_soc_dapm_mic || widget->id == snd_soc_dapm_line)
+ return 1;
+ }
+
+ list_for_each_entry(path, &widget->sources, list_sink) {
+ if (path->walked)
+ continue;
+
+ if (path->source && path->connect) {
+ path->walked = 1;
+ con += is_connected_input_ep(path->source);
+ }
+ }
+
+ return con;
+}
+
+/*
+ * Scan each dapm widget for complete audio path.
+ * A complete path is a route that has valid endpoints i.e.:-
+ *
+ * o DAC to output pin.
+ * o Input Pin to ADC.
+ * o Input pin to Output pin (bypass, sidetone)
+ * o DAC to ADC (loopback).
+ */
+int dapm_power_widgets(struct snd_soc_codec *codec, int event)
+{
+ struct snd_soc_dapm_widget *w;
+ int in, out, i, c = 1, *seq = NULL, ret = 0, power_change, power;
+
+ /* do we have a sequenced stream event */
+ if (event == SND_SOC_DAPM_STREAM_START) {
+ c = ARRAY_SIZE(dapm_up_seq);
+ seq = dapm_up_seq;
+ } else if (event == SND_SOC_DAPM_STREAM_STOP) {
+ c = ARRAY_SIZE(dapm_down_seq);
+ seq = dapm_down_seq;
+ }
+
+ for(i = 0; i < c; i++) {
+ list_for_each_entry(w, &codec->dapm_widgets, list) {
+
+ /* is widget in stream order */
+ if (seq && seq[i] && w->id != seq[i])
+ continue;
+
+ /* vmid - no action */
+ if (w->id == snd_soc_dapm_vmid)
+ continue;
+
+ /* active ADC */
+ if (w->id == snd_soc_dapm_adc && w->active) {
+ in = is_connected_input_ep(w);
+ dapm_clear_walk(w->codec);
+ w->power = (in != 0) ? 1 : 0;
+ dapm_update_bits(w);
+ continue;
+ }
+
+ /* active DAC */
+ if (w->id == snd_soc_dapm_dac && w->active) {
+ out = is_connected_output_ep(w);
+ dapm_clear_walk(w->codec);
+ w->power = (out != 0) ? 1 : 0;
+ dapm_update_bits(w);
+ continue;
+ }
+
+ /* programmable gain/attenuation */
+ if (w->id == snd_soc_dapm_pga) {
+ int on;
+ in = is_connected_input_ep(w);
+ dapm_clear_walk(w->codec);
+ out = is_connected_output_ep(w);
+ dapm_clear_walk(w->codec);
+ w->power = on = (out != 0 && in != 0) ? 1 : 0;
+
+ if (!on)
+ dapm_set_pga(w, on); /* lower volume to reduce pops */
+ dapm_update_bits(w);
+ if (on)
+ dapm_set_pga(w, on); /* restore volume from zero */
+
+ continue;
+ }
+
+ /* pre and post event widgets */
+ if (w->id == snd_soc_dapm_pre) {
+ if (!w->event)
+ continue;
+
+ if (event == SND_SOC_DAPM_STREAM_START) {
+ ret = w->event(w, SND_SOC_DAPM_PRE_PMU);
+ if (ret < 0)
+ return ret;
+ } else if (event == SND_SOC_DAPM_STREAM_STOP) {
+ ret = w->event(w, SND_SOC_DAPM_PRE_PMD);
+ if (ret < 0)
+ return ret;
+ }
+ continue;
+ }
+ if (w->id == snd_soc_dapm_post) {
+ if (!w->event)
+ continue;
+
+ if (event == SND_SOC_DAPM_STREAM_START) {
+ ret = w->event(w, SND_SOC_DAPM_POST_PMU);
+ if (ret < 0)
+ return ret;
+ } else if (event == SND_SOC_DAPM_STREAM_STOP) {
+ ret = w->event(w, SND_SOC_DAPM_POST_PMD);
+ if (ret < 0)
+ return ret;
+ }
+ continue;
+ }
+
+ /* all other widgets */
+ in = is_connected_input_ep(w);
+ dapm_clear_walk(w->codec);
+ out = is_connected_output_ep(w);
+ dapm_clear_walk(w->codec);
+ power = (out != 0 && in != 0) ? 1 : 0;
+ power_change = (w->power == power) ? 0: 1;
+ w->power = power;
+
+ /* call any power change event handlers */
+ if (power_change) {
+ if (w->event) {
+ dbg("power %s event for %s flags %x\n",
+ w->power ? "on" : "off", w->name, w->event_flags);
+ if (power) {
+ /* power up event */
+ if (w->event_flags & SND_SOC_DAPM_PRE_PMU) {
+ ret = w->event(w, SND_SOC_DAPM_PRE_PMU);
+ if (ret < 0)
+ return ret;
+ }
+ dapm_update_bits(w);
+ if (w->event_flags & SND_SOC_DAPM_POST_PMU){
+ ret = w->event(w, SND_SOC_DAPM_POST_PMU);
+ if (ret < 0)
+ return ret;
+ }
+ } else {
+ /* power down event */
+ if (w->event_flags & SND_SOC_DAPM_PRE_PMD) {
+ ret = w->event(w, SND_SOC_DAPM_PRE_PMD);
+ if (ret < 0)
+ return ret;
+ }
+ dapm_update_bits(w);
+ if (w->event_flags & SND_SOC_DAPM_POST_PMD) {
+ ret = w->event(w, SND_SOC_DAPM_POST_PMD);
+ if (ret < 0)
+ return ret;
+ }
+ }
+ } else
+ /* no event handler */
+ dapm_update_bits(w);
+ }
+ }
+ }
+
+ return ret;
+}
+
+#if DAPM_DEBUG
+static void dbg_dump_dapm(struct snd_soc_codec* codec, const char *action)
+{
+ struct snd_soc_dapm_widget *w;
+ struct snd_soc_dapm_path *p = NULL;
+ int in, out;
+
+ printk("DAPM %s %s\n", codec->name, action);
+
+ list_for_each_entry(w, &codec->dapm_widgets, list) {
+
+ /* only display widgets that effect routing */
+ switch (w->id) {
+ case snd_soc_dapm_pre:
+ case snd_soc_dapm_post:
+ case snd_soc_dapm_vmid:
+ continue;
+ case snd_soc_dapm_mux:
+ case snd_soc_dapm_output:
+ case snd_soc_dapm_input:
+ case snd_soc_dapm_switch:
+ case snd_soc_dapm_hp:
+ case snd_soc_dapm_mic:
+ case snd_soc_dapm_spk:
+ case snd_soc_dapm_line:
+ case snd_soc_dapm_micbias:
+ case snd_soc_dapm_dac:
+ case snd_soc_dapm_adc:
+ case snd_soc_dapm_pga:
+ case snd_soc_dapm_mixer:
+ if (w->name) {
+ in = is_connected_input_ep(w);
+ dapm_clear_walk(w->codec);
+ out = is_connected_output_ep(w);
+ dapm_clear_walk(w->codec);
+ printk("%s: %s in %d out %d\n", w->name,
+ w->power ? "On":"Off",in, out);
+
+ list_for_each_entry(p, &w->sources, list_sink) {
+ if (p->connect)
+ printk(" in %s %s\n", p->name ? p->name : "static",
+ p->source->name);
+ }
+ list_for_each_entry(p, &w->sinks, list_source) {
+ p = list_entry(lp, struct snd_soc_dapm_path, list_source);
+ if (p->connect)
+ printk(" out %s %s\n", p->name ? p->name : "static",
+ p->sink->name);
+ }
+ }
+ break;
+ }
+ }
+}
+#endif
+
+/* test and update the power status of a mux widget */
+int dapm_mux_update_power(struct snd_soc_dapm_widget *widget,
+ struct snd_kcontrol *kcontrol, int mask, int val, struct soc_enum* e)
+{
+ struct snd_soc_dapm_path *path;
+ int found = 0;
+
+ if (widget->id != snd_soc_dapm_mux)
+ return -ENODEV;
+
+ if (!snd_soc_test_bits(widget->codec, e->reg, mask, val))
+ return 0;
+
+ /* find dapm widget path assoc with kcontrol */
+ list_for_each_entry(path, &widget->codec->dapm_paths, list) {
+ if (path->kcontrol != kcontrol)
+ continue;
+
+ if (!path->name || ! e->texts[val])
+ continue;
+
+ found = 1;
+ /* we now need to match the string in the enum to the path */
+ if (!(strcmp(path->name, e->texts[val])))
+ path->connect = 1; /* new connection */
+ else
+ path->connect = 0; /* old connection must be powered down */
+ }
+
+ if (found)
+ dapm_power_widgets(widget->codec, SND_SOC_DAPM_STREAM_NOP);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(dapm_mux_update_power);
+
+/* test and update the power status of a mixer widget */
+int dapm_mixer_update_power(struct snd_soc_dapm_widget *widget,
+ struct snd_kcontrol *kcontrol, int reg, int val_mask, int val, int invert)
+{
+ struct snd_soc_dapm_path *path;
+ int found = 0;
+
+ if (widget->id != snd_soc_dapm_mixer)
+ return -ENODEV;
+
+ if (!snd_soc_test_bits(widget->codec, reg, val_mask, val))
+ return 0;
+
+ /* find dapm widget path assoc with kcontrol */
+ list_for_each_entry(path, &widget->codec->dapm_paths, list) {
+ if (path->kcontrol != kcontrol)
+ continue;
+
+ /* found, now check type */
+ found = 1;
+ if (val)
+ /* new connection */
+ path->connect = invert ? 0:1;
+ else
+ /* old connection must be powered down */
+ path->connect = invert ? 1:0;
+ break;
+ }
+
+ if (found)
+ dapm_power_widgets(widget->codec, SND_SOC_DAPM_STREAM_NOP);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(dapm_mixer_update_power);
+
+/* show dapm widget status in sys fs */
+static ssize_t dapm_widget_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct snd_soc_device *devdata = dev_get_drvdata(dev);
+ struct snd_soc_codec *codec = devdata->codec;
+ struct snd_soc_dapm_widget *w;
+ int count = 0;
+ char *state = "not set";
+
+ list_for_each_entry(w, &codec->dapm_widgets, list) {
+
+ /* only display widgets that burnm power */
+ switch (w->id) {
+ case snd_soc_dapm_hp:
+ case snd_soc_dapm_mic:
+ case snd_soc_dapm_spk:
+ case snd_soc_dapm_line:
+ case snd_soc_dapm_micbias:
+ case snd_soc_dapm_dac:
+ case snd_soc_dapm_adc:
+ case snd_soc_dapm_pga:
+ case snd_soc_dapm_mixer:
+ if (w->name)
+ count += sprintf(buf + count, "%s: %s\n",
+ w->name, w->power ? "On":"Off");
+ break;
+ default:
+ break;
+ }
+ }
+
+ switch(codec->dapm_state){
+ case SNDRV_CTL_POWER_D0:
+ state = "D0";
+ break;
+ case SNDRV_CTL_POWER_D1:
+ state = "D1";
+ break;
+ case SNDRV_CTL_POWER_D2:
+ state = "D2";
+ break;
+ case SNDRV_CTL_POWER_D3hot:
+ state = "D3hot";
+ break;
+ case SNDRV_CTL_POWER_D3cold:
+ state = "D3cold";
+ break;
+ }
+ count += sprintf(buf + count, "PM State: %s\n", state);
+
+ return count;
+}
+
+static DEVICE_ATTR(dapm_widget, 0444, dapm_widget_show, NULL);
+
+int snd_soc_dapm_sys_add(struct device *dev)
+{
+ int ret = 0;
+
+ if (dapm_status)
+ ret = device_create_file(dev, &dev_attr_dapm_widget);
+
+ return ret;
+}
+
+static void snd_soc_dapm_sys_remove(struct device *dev)
+{
+ if (dapm_status)
+ device_remove_file(dev, &dev_attr_dapm_widget);
+}
+
+/* free all dapm widgets and resources */
+void dapm_free_widgets(struct snd_soc_codec *codec)
+{
+ struct snd_soc_dapm_widget *w, *next_w;
+ struct snd_soc_dapm_path *p, *next_p;
+
+ list_for_each_entry_safe(w, next_w, &codec->dapm_widgets, list) {
+ list_del(&w->list);
+ kfree(w);
+ }
+
+ list_for_each_entry_safe(p, next_p, &codec->dapm_paths, list) {
+ list_del(&p->list);
+ kfree(p->long_name);
+ kfree(p);
+ }
+}
+
+/**
+ * snd_soc_dapm_sync_endpoints - scan and power dapm paths
+ * @codec: audio codec
+ *
+ * Walks all dapm audio paths and powers widgets according to their
+ * stream or path usage.
+ *
+ * Returns 0 for success.
+ */
+int snd_soc_dapm_sync_endpoints(struct snd_soc_codec *codec)
+{
+ return dapm_power_widgets(codec, SND_SOC_DAPM_STREAM_NOP);
+}
+EXPORT_SYMBOL_GPL(snd_soc_dapm_sync_endpoints);
+
+/**
+ * snd_soc_dapm_connect_input - connect dapm widgets
+ * @codec: audio codec
+ * @sink: name of target widget
+ * @control: mixer control name
+ * @source: name of source name
+ *
+ * Connects 2 dapm widgets together via a named audio path. The sink is
+ * the widget receiving the audio signal, whilst the source is the sender
+ * of the audio signal.
+ *
+ * Returns 0 for success else error.
+ */
+int snd_soc_dapm_connect_input(struct snd_soc_codec *codec, const char *sink,
+ const char * control, const char *source)
+{
+ struct snd_soc_dapm_path *path;
+ struct snd_soc_dapm_widget *wsource = NULL, *wsink = NULL, *w;
+ int ret = 0;
+
+ /* find src and dest widgets */
+ list_for_each_entry(w, &codec->dapm_widgets, list) {
+
+ if (!wsink && !(strcmp(w->name, sink))) {
+ wsink = w;
+ continue;
+ }
+ if (!wsource && !(strcmp(w->name, source))) {
+ wsource = w;
+ }
+ }
+
+ if (wsource == NULL || wsink == NULL)
+ return -ENODEV;
+
+ path = kzalloc(sizeof(struct snd_soc_dapm_path), GFP_KERNEL);
+ if (!path)
+ return -ENOMEM;
+
+ path->source = wsource;
+ path->sink = wsink;
+ INIT_LIST_HEAD(&path->list);
+ INIT_LIST_HEAD(&path->list_source);
+ INIT_LIST_HEAD(&path->list_sink);
+
+ /* check for external widgets */
+ if (wsink->id == snd_soc_dapm_input) {
+ if (wsource->id == snd_soc_dapm_micbias ||
+ wsource->id == snd_soc_dapm_mic ||
+ wsink->id == snd_soc_dapm_line)
+ wsink->ext = 1;
+ }
+ if (wsource->id == snd_soc_dapm_output) {
+ if (wsink->id == snd_soc_dapm_spk ||
+ wsink->id == snd_soc_dapm_hp ||
+ wsink->id == snd_soc_dapm_line)
+ wsource->ext = 1;
+ }
+
+ /* connect static paths */
+ if (control == NULL) {
+ list_add(&path->list, &codec->dapm_paths);
+ list_add(&path->list_sink, &wsink->sources);
+ list_add(&path->list_source, &wsource->sinks);
+ path->connect = 1;
+ return 0;
+ }
+
+ /* connect dynamic paths */
+ switch(wsink->id) {
+ case snd_soc_dapm_adc:
+ case snd_soc_dapm_dac:
+ case snd_soc_dapm_pga:
+ case snd_soc_dapm_input:
+ case snd_soc_dapm_output:
+ case snd_soc_dapm_micbias:
+ case snd_soc_dapm_vmid:
+ case snd_soc_dapm_pre:
+ case snd_soc_dapm_post:
+ list_add(&path->list, &codec->dapm_paths);
+ list_add(&path->list_sink, &wsink->sources);
+ list_add(&path->list_source, &wsource->sinks);
+ path->connect = 1;
+ return 0;
+ case snd_soc_dapm_mux:
+ ret = dapm_connect_mux(codec, wsource, wsink, path, control,
+ &wsink->kcontrols[0]);
+ if (ret != 0)
+ goto err;
+ break;
+ case snd_soc_dapm_switch:
+ case snd_soc_dapm_mixer:
+ ret = dapm_connect_mixer(codec, wsource, wsink, path, control);
+ if (ret != 0)
+ goto err;
+ break;
+ case snd_soc_dapm_hp:
+ case snd_soc_dapm_mic:
+ case snd_soc_dapm_line:
+ case snd_soc_dapm_spk:
+ list_add(&path->list, &codec->dapm_paths);
+ list_add(&path->list_sink, &wsink->sources);
+ list_add(&path->list_source, &wsource->sinks);
+ path->connect = 0;
+ return 0;
+ }
+ return 0;
+
+err:
+ printk(KERN_WARNING "asoc: no dapm match for %s --> %s --> %s\n", source,
+ control, sink);
+ kfree(path);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(snd_soc_dapm_connect_input);
+
+/**
+ * snd_soc_dapm_new_widgets - add new dapm widgets
+ * @codec: audio codec
+ *
+ * Checks the codec for any new dapm widgets and creates them if found.
+ *
+ * Returns 0 for success.
+ */
+int snd_soc_dapm_new_widgets(struct snd_soc_codec *codec)
+{
+ struct snd_soc_dapm_widget *w;
+
+ mutex_lock(&codec->mutex);
+ list_for_each_entry(w, &codec->dapm_widgets, list)
+ {
+ if (w->new)
+ continue;
+
+ switch(w->id) {
+ case snd_soc_dapm_switch:
+ case snd_soc_dapm_mixer:
+ dapm_new_mixer(codec, w);
+ break;
+ case snd_soc_dapm_mux:
+ dapm_new_mux(codec, w);
+ break;
+ case snd_soc_dapm_adc:
+ case snd_soc_dapm_dac:
+ case snd_soc_dapm_pga:
+ dapm_new_pga(codec, w);
+ break;
+ case snd_soc_dapm_input:
+ case snd_soc_dapm_output:
+ case snd_soc_dapm_micbias:
+ case snd_soc_dapm_spk:
+ case snd_soc_dapm_hp:
+ case snd_soc_dapm_mic:
+ case snd_soc_dapm_line:
+ case snd_soc_dapm_vmid:
+ case snd_soc_dapm_pre:
+ case snd_soc_dapm_post:
+ break;
+ }
+ w->new = 1;
+ }
+
+ dapm_power_widgets(codec, SND_SOC_DAPM_STREAM_NOP);
+ mutex_unlock(&codec->mutex);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(snd_soc_dapm_new_widgets);
+
+/**
+ * snd_soc_dapm_get_volsw - dapm mixer get callback
+ * @kcontrol: mixer control
+ * @uinfo: control element information
+ *
+ * Callback to get the value of a dapm mixer control.
+ *
+ * Returns 0 for success.
+ */
+int snd_soc_dapm_get_volsw(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ struct snd_soc_dapm_widget *widget = snd_kcontrol_chip(kcontrol);
+ int reg = kcontrol->private_value & 0xff;
+ int shift = (kcontrol->private_value >> 8) & 0x0f;
+ int rshift = (kcontrol->private_value >> 12) & 0x0f;
+ int mask = (kcontrol->private_value >> 16) & 0xff;
+ int invert = (kcontrol->private_value >> 24) & 0x01;
+
+ /* return the saved value if we are powered down */
+ if (widget->id == snd_soc_dapm_pga && !widget->power) {
+ ucontrol->value.integer.value[0] = widget->saved_value;
+ return 0;
+ }
+
+ ucontrol->value.integer.value[0] =
+ (snd_soc_read(widget->codec, reg) >> shift) & mask;
+ if (shift != rshift)
+ ucontrol->value.integer.value[1] =
+ (snd_soc_read(widget->codec, reg) >> rshift) & mask;
+ if (invert) {
+ ucontrol->value.integer.value[0] =
+ mask - ucontrol->value.integer.value[0];
+ if (shift != rshift)
+ ucontrol->value.integer.value[1] =
+ mask - ucontrol->value.integer.value[1];
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(snd_soc_dapm_get_volsw);
+
+/**
+ * snd_soc_dapm_put_volsw - dapm mixer set callback
+ * @kcontrol: mixer control
+ * @uinfo: control element information
+ *
+ * Callback to set the value of a dapm mixer control.
+ *
+ * Returns 0 for success.
+ */
+int snd_soc_dapm_put_volsw(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ struct snd_soc_dapm_widget *widget = snd_kcontrol_chip(kcontrol);
+ int reg = kcontrol->private_value & 0xff;
+ int shift = (kcontrol->private_value >> 8) & 0x0f;
+ int rshift = (kcontrol->private_value >> 12) & 0x0f;
+ int mask = (kcontrol->private_value >> 16) & 0xff;
+ int invert = (kcontrol->private_value >> 24) & 0x01;
+ unsigned short val, val2, val_mask;
+ int ret;
+
+ val = (ucontrol->value.integer.value[0] & mask);
+
+ if (invert)
+ val = mask - val;
+ val_mask = mask << shift;
+ val = val << shift;
+ if (shift != rshift) {
+ val2 = (ucontrol->value.integer.value[1] & mask);
+ if (invert)
+ val2 = mask - val2;
+ val_mask |= mask << rshift;
+ val |= val2 << rshift;
+ }
+
+ mutex_lock(&widget->codec->mutex);
+ widget->value = val;
+
+ /* save volume value if the widget is powered down */
+ if (widget->id == snd_soc_dapm_pga && !widget->power) {
+ widget->saved_value = val;
+ mutex_unlock(&widget->codec->mutex);
+ return 1;
+ }
+
+ dapm_mixer_update_power(widget, kcontrol, reg, val_mask, val, invert);
+ if (widget->event) {
+ if (widget->event_flags & SND_SOC_DAPM_PRE_REG) {
+ ret = widget->event(widget, SND_SOC_DAPM_PRE_REG);
+ if (ret < 0)
+ goto out;
+ }
+ ret = snd_soc_update_bits(widget->codec, reg, val_mask, val);
+ if (widget->event_flags & SND_SOC_DAPM_POST_REG)
+ ret = widget->event(widget, SND_SOC_DAPM_POST_REG);
+ } else
+ ret = snd_soc_update_bits(widget->codec, reg, val_mask, val);
+
+out:
+ mutex_unlock(&widget->codec->mutex);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(snd_soc_dapm_put_volsw);
+
+/**
+ * snd_soc_dapm_get_enum_double - dapm enumerated double mixer get callback
+ * @kcontrol: mixer control
+ * @uinfo: control element information
+ *
+ * Callback to get the value of a dapm enumerated double mixer control.
+ *
+ * Returns 0 for success.
+ */
+int snd_soc_dapm_get_enum_double(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ struct snd_soc_dapm_widget *widget = snd_kcontrol_chip(kcontrol);
+ struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
+ unsigned short val, bitmask;
+
+ for (bitmask = 1; bitmask < e->mask; bitmask <<= 1)
+ ;
+ val = snd_soc_read(widget->codec, e->reg);
+ ucontrol->value.enumerated.item[0] = (val >> e->shift_l) & (bitmask - 1);
+ if (e->shift_l != e->shift_r)
+ ucontrol->value.enumerated.item[1] =
+ (val >> e->shift_r) & (bitmask - 1);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(snd_soc_dapm_get_enum_double);
+
+/**
+ * snd_soc_dapm_put_enum_double - dapm enumerated double mixer set callback
+ * @kcontrol: mixer control
+ * @uinfo: control element information
+ *
+ * Callback to set the value of a dapm enumerated double mixer control.
+ *
+ * Returns 0 for success.
+ */
+int snd_soc_dapm_put_enum_double(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ struct snd_soc_dapm_widget *widget = snd_kcontrol_chip(kcontrol);
+ struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
+ unsigned short val, mux;
+ unsigned short mask, bitmask;
+ int ret = 0;
+
+ for (bitmask = 1; bitmask < e->mask; bitmask <<= 1)
+ ;
+ if (ucontrol->value.enumerated.item[0] > e->mask - 1)
+ return -EINVAL;
+ mux = ucontrol->value.enumerated.item[0];
+ val = mux << e->shift_l;
+ mask = (bitmask - 1) << e->shift_l;
+ if (e->shift_l != e->shift_r) {
+ if (ucontrol->value.enumerated.item[1] > e->mask - 1)
+ return -EINVAL;
+ val |= ucontrol->value.enumerated.item[1] << e->shift_r;
+ mask |= (bitmask - 1) << e->shift_r;
+ }
+
+ mutex_lock(&widget->codec->mutex);
+ widget->value = val;
+ dapm_mux_update_power(widget, kcontrol, mask, mux, e);
+ if (widget->event) {
+ if (widget->event_flags & SND_SOC_DAPM_PRE_REG) {
+ ret = widget->event(widget, SND_SOC_DAPM_PRE_REG);
+ if (ret < 0)
+ goto out;
+ }
+ ret = snd_soc_update_bits(widget->codec, e->reg, mask, val);
+ if (widget->event_flags & SND_SOC_DAPM_POST_REG)
+ ret = widget->event(widget, SND_SOC_DAPM_POST_REG);
+ } else
+ ret = snd_soc_update_bits(widget->codec, e->reg, mask, val);
+
+out:
+ mutex_unlock(&widget->codec->mutex);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(snd_soc_dapm_put_enum_double);
+
+/**
+ * snd_soc_dapm_new_control - create new dapm control
+ * @codec: audio codec
+ * @widget: widget template
+ *
+ * Creates a new dapm control based upon the template.
+ *
+ * Returns 0 for success else error.
+ */
+int snd_soc_dapm_new_control(struct snd_soc_codec *codec,
+ const struct snd_soc_dapm_widget *widget)
+{
+ struct snd_soc_dapm_widget *w;
+
+ if ((w = dapm_cnew_widget(widget)) == NULL)
+ return -ENOMEM;
+
+ w->codec = codec;
+ INIT_LIST_HEAD(&w->sources);
+ INIT_LIST_HEAD(&w->sinks);
+ INIT_LIST_HEAD(&w->list);
+ list_add(&w->list, &codec->dapm_widgets);
+
+ /* machine layer set ups unconnected pins and insertions */
+ w->connected = 1;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(snd_soc_dapm_new_control);
+
+/**
+ * snd_soc_dapm_stream_event - send a stream event to the dapm core
+ * @codec: audio codec
+ * @stream: stream name
+ * @event: stream event
+ *
+ * Sends a stream event to the dapm core. The core then makes any
+ * necessary widget power changes.
+ *
+ * Returns 0 for success else error.
+ */
+int snd_soc_dapm_stream_event(struct snd_soc_codec *codec,
+ char *stream, int event)
+{
+ struct snd_soc_dapm_widget *w;
+
+ mutex_lock(&codec->mutex);
+ list_for_each_entry(w, &codec->dapm_widgets, list)
+ {
+ if (!w->sname)
+ continue;
+ dbg("widget %s\n %s stream %s event %d\n", w->name, w->sname,
+ stream, event);
+ if (strstr(w->sname, stream)) {
+ switch(event) {
+ case SND_SOC_DAPM_STREAM_START:
+ w->active = 1;
+ break;
+ case SND_SOC_DAPM_STREAM_STOP:
+ w->active = 0;
+ break;
+ case SND_SOC_DAPM_STREAM_SUSPEND:
+ if (w->active)
+ w->suspend = 1;
+ w->active = 0;
+ break;
+ case SND_SOC_DAPM_STREAM_RESUME:
+ if (w->suspend) {
+ w->active = 1;
+ w->suspend = 0;
+ }
+ break;
+ case SND_SOC_DAPM_STREAM_PAUSE_PUSH:
+ break;
+ case SND_SOC_DAPM_STREAM_PAUSE_RELEASE:
+ break;
+ }
+ }
+ }
+ mutex_unlock(&codec->mutex);
+
+ dapm_power_widgets(codec, event);
+ dump_dapm(codec, __FUNCTION__);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(snd_soc_dapm_stream_event);
+
+/**
+ * snd_soc_dapm_set_endpoint - set audio endpoint status
+ * @codec: audio codec
+ * @endpoint: audio signal endpoint (or start point)
+ * @status: point status
+ *
+ * Set audio endpoint status - connected or disconnected.
+ *
+ * Returns 0 for success else error.
+ */
+int snd_soc_dapm_set_endpoint(struct snd_soc_codec *codec,
+ char *endpoint, int status)
+{
+ struct snd_soc_dapm_widget *w;
+
+ list_for_each_entry(w, &codec->dapm_widgets, list) {
+ if (!strcmp(w->name, endpoint)) {
+ w->connected = status;
+ }
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(snd_soc_dapm_set_endpoint);
+
+/**
+ * snd_soc_dapm_free - free dapm resources
+ * @socdev: SoC device
+ *
+ * Free all dapm widgets and resources.
+ */
+void snd_soc_dapm_free(struct snd_soc_device *socdev)
+{
+ struct snd_soc_codec *codec = socdev->codec;
+
+ snd_soc_dapm_sys_remove(socdev->dev);
+ dapm_free_widgets(codec);
+}
+EXPORT_SYMBOL_GPL(snd_soc_dapm_free);
+
+/* Module information */
+MODULE_AUTHOR("Liam Girdwood, liam.girdwood@xxxxxxxxxxxxxxxx, www.wolfsonmicro.com");
+MODULE_DESCRIPTION("Dynamic Audio Power Management core for ALSA SoC");
+MODULE_LICENSE("GPL");
-------------------------------------------------------------------------
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