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soc-dapm.c

/*
 * soc-dapm.c  --  ALSA SoC Dynamic Audio Power Management
 *
 * Copyright 2005 Wolfson Microelectronics PLC.
 * Author: Liam Girdwood <lrg@slimlogic.co.uk>
 *
 *  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.
 *
 *  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 susbsystem 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 <linux/debugfs.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc-dapm.h>
#include <sound/initval.h>

/* debug */
#ifdef DEBUG
#define dump_dapm(codec, action) dbg_dump_dapm(codec, action)
#else
#define dump_dapm(codec, action)
#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");

static struct dentry *asoc_debugfs;

static u32 pop_time;

static void pop_wait(void)
{
      if (pop_time)
            schedule_timeout_uninterruptible(msecs_to_jiffies(pop_time));
}

static void pop_dbg(const char *fmt, ...)
{
      va_list args;

      va_start(args, fmt);

      if (pop_time) {
            vprintk(fmt, args);
            pop_wait();
      }

      va_end(args);
}

/* create a new dapm widget */
static inline struct snd_soc_dapm_widget *dapm_cnew_widget(
      const struct snd_soc_dapm_widget *_widget)
{
      return kmemdup(_widget, sizeof(*_widget), GFP_KERNEL);
}

/* 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;
            struct soc_mixer_control *mc = (struct soc_mixer_control *)
                  w->kcontrols[i].private_value;
            unsigned int reg = mc->reg;
            unsigned int shift = mc->shift;
            int max = mc->max;
            unsigned int mask = (1 << fls(max)) - 1;
            unsigned int invert = mc->invert;

            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->max; 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->max; 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->max; 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();
      }
      pr_debug("reg %x old %x new %x change %d\n", widget->reg,
             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) {
            struct soc_mixer_control *mc =
                  (struct soc_mixer_control *)k->private_value;
            unsigned int reg = mc->reg;
            unsigned int shift = mc->shift;
            int max = mc->max;
            unsigned int mask = (1 << fls(max)) - 1;
            unsigned int invert = mc->invert;

            if (power) {
                  int i;
                  /* power up has happended, increase volume to last level */
                  if (invert) {
                        for (i = max; 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;
}

/*
 * Handler for generic register modifier widget.
 */
int dapm_reg_event(struct snd_soc_dapm_widget *w,
               struct snd_kcontrol *kcontrol, int event)
{
      unsigned int val;

      if (SND_SOC_DAPM_EVENT_ON(event))
            val = w->on_val;
      else
            val = w->off_val;

      snd_soc_update_bits(w->codec, -(w->reg + 1),
                      w->mask << w->shift, val << w->shift);

      return 0;
}
EXPORT_SYMBOL_GPL(dapm_reg_event);

/*
 * 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).
 */
static 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;
                  }

                  /* 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,
                                    NULL, SND_SOC_DAPM_PRE_PMU);
                              if (ret < 0)
                                    return ret;
                        } else if (event == SND_SOC_DAPM_STREAM_STOP) {
                              ret = w->event(w,
                                    NULL, 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,
                                    NULL, SND_SOC_DAPM_POST_PMU);
                              if (ret < 0)
                                    return ret;
                        } else if (event == SND_SOC_DAPM_STREAM_STOP) {
                              ret = w->event(w,
                                    NULL, 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;

                  if (!power_change)
                        continue;

                  /* call any power change event handlers */
                  if (w->event)
                        pr_debug("power %s event for %s flags %x\n",
                               w->power ? "on" : "off",
                               w->name, w->event_flags);

                  /* power up pre event */
                  if (power && w->event &&
                      (w->event_flags & SND_SOC_DAPM_PRE_PMU)) {
                        ret = w->event(w, NULL, SND_SOC_DAPM_PRE_PMU);
                        if (ret < 0)
                              return ret;
                  }

                  /* power down pre event */
                  if (!power && w->event &&
                      (w->event_flags & SND_SOC_DAPM_PRE_PMD)) {
                        ret = w->event(w, NULL, SND_SOC_DAPM_PRE_PMD);
                        if (ret < 0)
                              return ret;
                  }

                  /* Lower PGA volume to reduce pops */
                  if (w->id == snd_soc_dapm_pga && !power)
                        dapm_set_pga(w, power);

                  dapm_update_bits(w);

                  /* Raise PGA volume to reduce pops */
                  if (w->id == snd_soc_dapm_pga && power)
                        dapm_set_pga(w, power);

                  /* power up post event */
                  if (power && w->event &&
                      (w->event_flags & SND_SOC_DAPM_POST_PMU)) {
                        ret = w->event(w,
                                     NULL, SND_SOC_DAPM_POST_PMU);
                        if (ret < 0)
                              return ret;
                  }

                  /* power down post event */
                  if (!power && w->event &&
                      (w->event_flags & SND_SOC_DAPM_POST_PMD)) {
                        ret = w->event(w, NULL, SND_SOC_DAPM_POST_PMD);
                        if (ret < 0)
                              return ret;
                  }
            }
      }

      return ret;
}

#ifdef 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) {
                              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 */
static int dapm_mux_update_power(struct snd_soc_dapm_widget *widget,
                         struct snd_kcontrol *kcontrol, int mask,
                         int mux, 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[mux])
                  continue;

            found = 1;
            /* we now need to match the string in the enum to the path */
            if (!(strcmp(path->name, e->texts[mux])))
                  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);
            dump_dapm(widget->codec, "mux power update");
      }

      return 0;
}

/* test and update the power status of a mixer or switch widget */
static 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 &&
          widget->id != snd_soc_dapm_switch)
            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);
            dump_dapm(widget->codec, "mixer power update");
      }

      return 0;
}

/* 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->bias_level) {
      case SND_SOC_BIAS_ON:
            state = "On";
            break;
      case SND_SOC_BIAS_PREPARE:
            state = "Prepare";
            break;
      case SND_SOC_BIAS_STANDBY:
            state = "Standby";
            break;
      case SND_SOC_BIAS_OFF:
            state = "Off";
            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)
            return 0;

      ret = device_create_file(dev, &dev_attr_dapm_widget);
      if (ret != 0)
            return ret;

      asoc_debugfs = debugfs_create_dir("asoc", NULL);
      if (!IS_ERR(asoc_debugfs) && asoc_debugfs)
            debugfs_create_u32("dapm_pop_time", 0744, asoc_debugfs,
                           &pop_time);
      else
            asoc_debugfs = NULL;

      return 0;
}

static void snd_soc_dapm_sys_remove(struct device *dev)
{
      if (dapm_status) {
            device_remove_file(dev, &dev_attr_dapm_widget);
      }

      if (asoc_debugfs)
            debugfs_remove_recursive(asoc_debugfs);
}

/* free all dapm widgets and resources */
static 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);
      }
}

static int snd_soc_dapm_set_pin(struct snd_soc_codec *codec,
      char *pin, int status)
{
      struct snd_soc_dapm_widget *w;

      list_for_each_entry(w, &codec->dapm_widgets, list) {
            if (!strcmp(w->name, pin)) {
                  pr_debug("dapm: %s: pin %s\n", codec->name, pin);
                  w->connected = status;
                  return 0;
            }
      }

      pr_err("dapm: %s: configuring unknown pin %s\n", codec->name, pin);
      return -EINVAL;
}

/**
 * snd_soc_dapm_sync - 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(struct snd_soc_codec *codec)
{
      int ret = dapm_power_widgets(codec, SND_SOC_DAPM_STREAM_NOP);
      dump_dapm(codec, "sync");
      return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_dapm_sync);

static int snd_soc_dapm_add_route(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->id == snd_soc_dapm_output)
                  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 ||
                  wsink->id == snd_soc_dapm_input)
                  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;
}

/**
 * snd_soc_dapm_add_routes - Add routes between DAPM widgets
 * @codec: codec
 * @route: audio routes
 * @num: number of routes
 *
 * 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. On error all resources can be freed
 * with a call to snd_soc_card_free().
 */
int snd_soc_dapm_add_routes(struct snd_soc_codec *codec,
                      const struct snd_soc_dapm_route *route, int num)
{
      int i, ret;

      for (i = 0; i < num; i++) {
            ret = snd_soc_dapm_add_route(codec, route->sink,
                                   route->control, route->source);
            if (ret < 0) {
                  printk(KERN_ERR "Failed to add route %s->%s\n",
                         route->source,
                         route->sink);
                  return ret;
            }
            route++;
      }

      return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_dapm_add_routes);

/**
 * 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;

      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);
      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);
      struct soc_mixer_control *mc =
            (struct soc_mixer_control *)kcontrol->private_value;
      unsigned int reg = mc->reg;
      unsigned int shift = mc->shift;
      unsigned int rshift = mc->rshift;
      int max = mc->max;
      unsigned int invert = mc->invert;
      unsigned int mask = (1 << fls(max)) - 1;

      /* 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] =
                  max - ucontrol->value.integer.value[0];
            if (shift != rshift)
                  ucontrol->value.integer.value[1] =
                        max - 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);
      struct soc_mixer_control *mc =
            (struct soc_mixer_control *)kcontrol->private_value;
      unsigned int reg = mc->reg;
      unsigned int shift = mc->shift;
      unsigned int rshift = mc->rshift;
      int max = mc->max;
      unsigned int mask = (1 << fls(max)) - 1;
      unsigned int invert = mc->invert;
      unsigned short val, val2, val_mask;
      int ret;

      val = (ucontrol->value.integer.value[0] & mask);

      if (invert)
            val = max - val;
      val_mask = mask << shift;
      val = val << shift;
      if (shift != rshift) {
            val2 = (ucontrol->value.integer.value[1] & mask);
            if (invert)
                  val2 = max - 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, kcontrol,
                                    SND_SOC_DAPM_PRE_REG);
                  if (ret < 0) {
                        ret = 1;
                        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, kcontrol,
                                    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->max; 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->max; bitmask <<= 1)
            ;
      if (ucontrol->value.enumerated.item[0] > e->max - 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->max - 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, val, e);
      if (widget->event) {
            if (widget->event_flags & SND_SOC_DAPM_PRE_REG) {
                  ret = widget->event(widget,
                        kcontrol, 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,
                        kcontrol, 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_new_controls - create new dapm controls
 * @codec: audio codec
 * @widget: widget array
 * @num: number of widgets
 *
 * Creates new DAPM controls based upon the templates.
 *
 * Returns 0 for success else error.
 */
int snd_soc_dapm_new_controls(struct snd_soc_codec *codec,
      const struct snd_soc_dapm_widget *widget,
      int num)
{
      int i, ret;

      for (i = 0; i < num; i++) {
            ret = snd_soc_dapm_new_control(codec, widget);
            if (ret < 0)
                  return ret;
            widget++;
      }
      return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_dapm_new_controls);


/**
 * 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;

      if (stream == NULL)
            return 0;

      mutex_lock(&codec->mutex);
      list_for_each_entry(w, &codec->dapm_widgets, list)
      {
            if (!w->sname)
                  continue;
            pr_debug("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, __func__);
      return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_dapm_stream_event);

/**
 * snd_soc_dapm_set_bias_level - set the bias level for the system
 * @socdev: audio device
 * @level: level to configure
 *
 * Configure the bias (power) levels for the SoC audio device.
 *
 * Returns 0 for success else error.
 */
int snd_soc_dapm_set_bias_level(struct snd_soc_device *socdev,
                        enum snd_soc_bias_level level)
{
      struct snd_soc_codec *codec = socdev->codec;
      struct snd_soc_machine *machine = socdev->machine;
      int ret = 0;

      if (machine->set_bias_level)
            ret = machine->set_bias_level(machine, level);
      if (ret == 0 && codec->set_bias_level)
            ret = codec->set_bias_level(codec, level);

      return ret;
}

/**
 * snd_soc_dapm_enable_pin - enable pin.
 * @snd_soc_codec: SoC codec
 * @pin: pin name
 *
 * Enables input/output pin and it's parents or children widgets iff there is
 * a valid audio route and active audio stream.
 * NOTE: snd_soc_dapm_sync() needs to be called after this for DAPM to
 * do any widget power switching.
 */
int snd_soc_dapm_enable_pin(struct snd_soc_codec *codec, char *pin)
{
      return snd_soc_dapm_set_pin(codec, pin, 1);
}
EXPORT_SYMBOL_GPL(snd_soc_dapm_enable_pin);

/**
 * snd_soc_dapm_disable_pin - disable pin.
 * @codec: SoC codec
 * @pin: pin name
 *
 * Disables input/output pin and it's parents or children widgets.
 * NOTE: snd_soc_dapm_sync() needs to be called after this for DAPM to
 * do any widget power switching.
 */
int snd_soc_dapm_disable_pin(struct snd_soc_codec *codec, char *pin)
{
      return snd_soc_dapm_set_pin(codec, pin, 0);
}
EXPORT_SYMBOL_GPL(snd_soc_dapm_disable_pin);

/**
 * snd_soc_dapm_nc_pin - permanently disable pin.
 * @codec: SoC codec
 * @pin: pin name
 *
 * Marks the specified pin as being not connected, disabling it along
 * any parent or child widgets.  At present this is identical to
 * snd_soc_dapm_disable_pin() but in future it will be extended to do
 * additional things such as disabling controls which only affect
 * paths through the pin.
 *
 * NOTE: snd_soc_dapm_sync() needs to be called after this for DAPM to
 * do any widget power switching.
 */
int snd_soc_dapm_nc_pin(struct snd_soc_codec *codec, char *pin)
{
      return snd_soc_dapm_set_pin(codec, pin, 0);
}
EXPORT_SYMBOL_GPL(snd_soc_dapm_nc_pin);

/**
 * snd_soc_dapm_get_pin_status - get audio pin status
 * @codec: audio codec
 * @pin: audio signal pin endpoint (or start point)
 *
 * Get audio pin status - connected or disconnected.
 *
 * Returns 1 for connected otherwise 0.
 */
int snd_soc_dapm_get_pin_status(struct snd_soc_codec *codec, char *pin)
{
      struct snd_soc_dapm_widget *w;

      list_for_each_entry(w, &codec->dapm_widgets, list) {
            if (!strcmp(w->name, pin))
                  return w->connected;
      }

      return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_dapm_get_pin_status);

/**
 * 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, lrg@slimlogic.co.uk");
MODULE_DESCRIPTION("Dynamic Audio Power Management core for ALSA SoC");
MODULE_LICENSE("GPL");

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