text: /* arch/arm/mach-msm/qdsp5/audio_out.c
   *
   * pcm audio output device
   *
   * Copyright (C) 2008 Google, Inc.
   * Copyright (C) 2008 HTC Corporation
   *
   * This software is licensed under the terms of the GNU General Public
   * License version 2, as published by the Free Software Foundation, and
   * may be copied, distributed, and modified under those terms.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   */
  
  #include <linux/module.h>
  #include <linux/fs.h>
  #include <linux/miscdevice.h>
  #include <linux/uaccess.h>
  #include <linux/kthread.h>
  #include <linux/wait.h>
  #include <linux/dma-mapping.h>
  #include <linux/debugfs.h>
  #include <linux/delay.h>
  #include <linux/wakelock.h>
  
  #include <linux/msm_audio.h>
  
  #include <asm/atomic.h>
  #include <asm/ioctls.h>
  #include <mach/msm_adsp.h>
  
  #include "audmgr.h"
  
  #include <mach/qdsp5/qdsp5audppcmdi.h>
  #include <mach/qdsp5/qdsp5audppmsg.h>
  
  #include <mach/htc_pwrsink.h>
  
  #include "evlog.h"
  
  #define LOG_AUDIO_EVENTS 1
  #define LOG_AUDIO_FAULTS 0
  
  enum {
  	EV_NULL,
  	EV_OPEN,
  	EV_WRITE,
  	EV_RETURN,
  	EV_IOCTL,
  	EV_WRITE_WAIT,
  	EV_WAIT_EVENT,
  	EV_FILL_BUFFER,
  	EV_SEND_BUFFER,
  	EV_DSP_EVENT,
  	EV_ENABLE,
  };
  
  #if (LOG_AUDIO_EVENTS != 1)
  static inline void LOG(unsigned id, unsigned arg) {}
  #else
  static const char *pcm_log_strings[] = {
  	"NULL",
  	"OPEN",
  	"WRITE",
  	"RETURN",
  	"IOCTL",
  	"WRITE_WAIT",
  	"WAIT_EVENT",
  	"FILL_BUFFER",
  	"SEND_BUFFER",
  	"DSP_EVENT",
  	"ENABLE",
  };
  
  DECLARE_LOG(pcm_log, 64, pcm_log_strings);
  
  static int __init _pcm_log_init(void)
  {
  	return ev_log_init(&pcm_log);
  }
  module_init(_pcm_log_init);
  
  #define LOG(id,arg) ev_log_write(&pcm_log, id, arg)
  #endif
  
  
  
  
  
  #define BUFSZ (960 * 5)
  #define DMASZ (BUFSZ * 2)
  
  #define AUDPP_CMD_CFG_OBJ_UPDATE 0x8000
  #define AUDPP_CMD_EQ_FLAG_DIS	0x0000
  #define AUDPP_CMD_EQ_FLAG_ENA	-1
  #define AUDPP_CMD_IIR_FLAG_DIS	  0x0000
  #define AUDPP_CMD_IIR_FLAG_ENA	  -1
  
  #define AUDPP_CMD_IIR_TUNING_FILTER  1
  #define AUDPP_CMD_EQUALIZER	2
  #define AUDPP_CMD_ADRC	3
  
  #define ADRC_ENABLE  0x0001
  #define EQ_ENABLE    0x0002
  #define IIR_ENABLE   0x0004
  
  struct adrc_filter {
  	uint16_t compression_th;
  	uint16_t compression_slope;
  	uint16_t rms_time;
  	uint16_t attack_const_lsw;
  	uint16_t attack_const_msw;
  	uint16_t release_const_lsw;
  	uint16_t release_const_msw;
  	uint16_t adrc_system_delay;
  };
  
  struct eqalizer {
  	uint16_t num_bands;
  	uint16_t eq_params[132];
  };
  
  struct rx_iir_filter {
  	uint16_t num_bands;
  	uint16_t iir_params[48];
  };
  
  typedef struct {
  	audpp_cmd_cfg_object_params_common common;
  	uint16_t eq_flag;
  	uint16_t num_bands;
  	uint16_t eq_params[132];
  } audpp_cmd_cfg_object_params_eq;
  
  typedef struct {
  	audpp_cmd_cfg_object_params_common common;
  	uint16_t active_flag;
  	uint16_t num_bands;
  	uint16_t iir_params[48];
  } audpp_cmd_cfg_object_params_rx_iir;
  
  struct buffer {
  	void *data;
  	unsigned size;
  	unsigned used;
  	unsigned addr;
  };
  
  struct audio {
  	struct buffer out[2];
  
  	spinlock_t dsp_lock;
  
  	uint8_t out_head;
  	uint8_t out_tail;
  	uint8_t out_needed; /* number of buffers the dsp is waiting for */
  
  	atomic_t out_bytes;
  
  	struct mutex lock;
  	struct mutex write_lock;
  	wait_queue_head_t wait;
  
  	/* configuration to use on next enable */
  	uint32_t out_sample_rate;
  	uint32_t out_channel_mode;
  	uint32_t out_weight;
  	uint32_t out_buffer_size;
  
  	struct audmgr audmgr;
  
  	/* data allocated for various buffers */
  	char *data;
  	dma_addr_t phys;
  
  	int opened;
  	int enabled;
  	int running;
  	int stopped; /* set when stopped, cleared on flush */
  	unsigned volume;
  
  	struct wake_lock wakelock;
  	struct wake_lock idlelock;
  
  	int adrc_enable;
  	struct adrc_filter adrc;
  
  	int eq_enable;
  	struct eqalizer eq;
  
  	int rx_iir_enable;
  	struct rx_iir_filter iir;
  };
  
  static void audio_prevent_sleep(struct audio *audio)
  {
  	printk(KERN_INFO "++++++++++++++++++++++++++++++\n");
  	wake_lock(&audio->wakelock);
  	wake_lock(&audio->idlelock);
  }
  
  static void audio_allow_sleep(struct audio *audio)
  {
  	wake_unlock(&audio->wakelock);
  	wake_unlock(&audio->idlelock);
  	printk(KERN_INFO "------------------------------\n");
  }
  
  static int audio_dsp_out_enable(struct audio *audio, int yes);
  static int audio_dsp_send_buffer(struct audio *audio, unsigned id, unsigned len);
  static int audio_dsp_set_adrc(struct audio *audio);
  static int audio_dsp_set_eq(struct audio *audio);
  static int audio_dsp_set_rx_iir(struct audio *audio);
  
  static void audio_dsp_event(void *private, unsigned id, uint16_t *msg);
  
  /* must be called with audio->lock held */
  static int audio_enable(struct audio *audio)
  {
  	struct audmgr_config cfg;
  	int rc;
  
  	pr_info("audio_enable()\n");
  
  	if (audio->enabled)
  		return 0;
  
  	/* refuse to start if we're not ready */
  	if (!audio->out[0].used || !audio->out[1].used)
  		return -EIO;
  
  	/* we start buffers 0 and 1, so buffer 0 will be the
  	 * next one the dsp will want
  	 */
  	audio->out_tail = 0;
  	audio->out_needed = 0;
  
  	cfg.tx_rate = RPC_AUD_DEF_SAMPLE_RATE_NONE;
  	cfg.rx_rate = RPC_AUD_DEF_SAMPLE_RATE_48000;
  	cfg.def_method = RPC_AUD_DEF_METHOD_HOST_PCM;
  	cfg.codec = RPC_AUD_DEF_CODEC_PCM;
  	cfg.snd_method = RPC_SND_METHOD_MIDI;
  
  	audio_prevent_sleep(audio);
  	rc = audmgr_enable(&audio->audmgr, &cfg);
  	if (rc < 0) {
  		audio_allow_sleep(audio);
  		return rc;
  	}
  
  	if (audpp_enable(-1, audio_dsp_event, audio)) {
  		pr_err("audio: audpp_enable() failed\n");
  		audmgr_disable(&audio->audmgr);
  		audio_allow_sleep(audio);
  		return -ENODEV;
  	}
  
  	audio->enabled = 1;
  	htc_pwrsink_set(PWRSINK_AUDIO, 100);
  	return 0;
  }
  
  /* must be called with audio->lock held */
  static int audio_disable(struct audio *audio)
  {
  	pr_info("audio_disable()\n");
  	if (audio->enabled) {
  		audio->enabled = 0;
  		audio_dsp_out_enable(audio, 0);
  
  		audpp_disable(-1, audio);
  
  		wake_up(&audio->wait);
  		audmgr_disable(&audio->audmgr);
  		audio->out_needed = 0;
  		audio_allow_sleep(audio);
  	}
  	return 0;
  }
  
  /* ------------------- dsp --------------------- */
  static void audio_dsp_event(void *private, unsigned id, uint16_t *msg)
  {
  	struct audio *audio = private;
  	struct buffer *frame;
  	unsigned long flags;
  
  	LOG(EV_DSP_EVENT, id);
  	switch (id) {
  	case AUDPP_MSG_HOST_PCM_INTF_MSG: {
  		unsigned id = msg[2];
  		unsigned idx = msg[3] - 1;
  
  		/* pr_info("audio_dsp_event: HOST_PCM id %d idx %d\n", id, idx); */
  		if (id != AUDPP_MSG_HOSTPCM_ID_ARM_RX) {
  			pr_err("bogus id\n");
  			break;
  		}
  		if (idx > 1) {
  			pr_err("bogus buffer idx\n");
  			break;
  		}
  
  		spin_lock_irqsave(&audio->dsp_lock, flags);
  		if (audio->running) {
  			atomic_add(audio->out[idx].used, &audio->out_bytes);
  			audio->out[idx].used = 0;
  
  			frame = audio->out + audio->out_tail;
  			if (frame->used) {
  				audio_dsp_send_buffer(
  					audio, audio->out_tail, frame->used);
  				audio->out_tail ^= 1;
  			} else {
  				audio->out_needed++;
  			}
  			wake_up(&audio->wait);
  		}
  		spin_unlock_irqrestore(&audio->dsp_lock, flags);
  		break;
  	}
  	case AUDPP_MSG_PCMDMAMISSED:
  		pr_info("audio_dsp_event: PCMDMAMISSED %d\n", msg[0]);
  		break;
  	case AUDPP_MSG_CFG_MSG:
  		if (msg[0] == AUDPP_MSG_ENA_ENA) {
  			LOG(EV_ENABLE, 1);
  			pr_info("audio_dsp_event: CFG_MSG ENABLE\n");
  			audio->out_needed = 0;
  			audio->running = 1;
  			audpp_set_volume_and_pan(5, audio->volume, 0);
  			audio_dsp_set_adrc(audio);
  			audio_dsp_set_eq(audio);
  			audio_dsp_set_rx_iir(audio);
  			audio_dsp_out_enable(audio, 1);
  		} else if (msg[0] == AUDPP_MSG_ENA_DIS) {
  			LOG(EV_ENABLE, 0);
  			pr_info("audio_dsp_event: CFG_MSG DISABLE\n");
  			audio->running = 0;
  		} else {
  			pr_err("audio_dsp_event: CFG_MSG %d?\n", msg[0]);
  		}
  		break;
  	default:
  		pr_err("audio_dsp_event: UNKNOWN (%d)\n", id);
  	}
  }
  
  static int audio_dsp_out_enable(struct audio *audio, int yes)
  {
  	audpp_cmd_pcm_intf cmd;
  
  	memset(&cmd, 0, sizeof(cmd));
  	cmd.cmd_id	= AUDPP_CMD_PCM_INTF_2;
  	cmd.object_num	= AUDPP_CMD_PCM_INTF_OBJECT_NUM;
  	cmd.config	= AUDPP_CMD_PCM_INTF_CONFIG_CMD_V;
  	cmd.intf_type	= AUDPP_CMD_PCM_INTF_RX_ENA_ARMTODSP_V;
  
  	if (yes) {
  		cmd.write_buf1LSW	= audio->out[0].addr;
  		cmd.write_buf1MSW	= audio->out[0].addr >> 16;
  		cmd.write_buf1_len	= audio->out[0].size;
  		cmd.write_buf2LSW	= audio->out[1].addr;
  		cmd.write_buf2MSW	= audio->out[1].addr >> 16;
  		cmd.write_buf2_len	= audio->out[1].size;
  		cmd.arm_to_rx_flag	= AUDPP_CMD_PCM_INTF_ENA_V;
  		cmd.weight_decoder_to_rx = audio->out_weight;
  		cmd.weight_arm_to_rx	= 1;
  		cmd.partition_number_arm_to_dsp = 0;
  		cmd.sample_rate		= audio->out_sample_rate;
  		cmd.channel_mode	= audio->out_channel_mode;
  	}
  
  	return audpp_send_queue2(&cmd, sizeof(cmd));
  }
  
  static int audio_dsp_send_buffer(struct audio *audio, unsigned idx, unsigned len)
  {
  	audpp_cmd_pcm_intf_send_buffer cmd;
  
  	cmd.cmd_id		= AUDPP_CMD_PCM_INTF_2;
  	cmd.host_pcm_object	= AUDPP_CMD_PCM_INTF_OBJECT_NUM;
  	cmd.config		= AUDPP_CMD_PCM_INTF_BUFFER_CMD_V;
  	cmd.intf_type		= AUDPP_CMD_PCM_INTF_RX_ENA_ARMTODSP_V;
  	cmd.dsp_to_arm_buf_id	= 0;
  	cmd.arm_to_dsp_buf_id	= idx + 1;
  	cmd.arm_to_dsp_buf_len	= len;
  
  	LOG(EV_SEND_BUFFER, idx);
  	return audpp_send_queue2(&cmd, sizeof(cmd));
  }
  
  static int audio_dsp_set_adrc(struct audio *audio)
  {
  	audpp_cmd_cfg_object_params_adrc cmd;
  
  	memset(&cmd, 0, sizeof(cmd));
  	cmd.common.comman_cfg = AUDPP_CMD_CFG_OBJ_UPDATE;
  	cmd.common.command_type = AUDPP_CMD_ADRC;
  
  	if (audio->adrc_enable) {
  		cmd.adrc_flag = AUDPP_CMD_ADRC_FLAG_ENA;
  		cmd.compression_th = audio->adrc.compression_th;
  		cmd.compression_slope = audio->adrc.compression_slope;
  		cmd.rms_time = audio->adrc.rms_time;
  		cmd.attack_const_lsw = audio->adrc.attack_const_lsw;
  		cmd.attack_const_msw = audio->adrc.attack_const_msw;
  		cmd.release_const_lsw = audio->adrc.release_const_lsw;
  		cmd.release_const_msw = audio->adrc.release_const_msw;
  		cmd.adrc_system_delay = audio->adrc.adrc_system_delay;
  	} else {
  		cmd.adrc_flag = AUDPP_CMD_ADRC_FLAG_DIS;
  	}
  	return audpp_send_queue3(&cmd, sizeof(cmd));
  }
  
  static int audio_dsp_set_eq(struct audio *audio)
  {
  	audpp_cmd_cfg_object_params_eq cmd;
  
  	memset(&cmd, 0, sizeof(cmd));
  	cmd.common.comman_cfg = AUDPP_CMD_CFG_OBJ_UPDATE;
  	cmd.common.command_type = AUDPP_CMD_EQUALIZER;
  
  	if (audio->eq_enable) {
  		cmd.eq_flag = AUDPP_CMD_EQ_FLAG_ENA;
  		cmd.num_bands = audio->eq.num_bands;
  		memcpy(&cmd.eq_params, audio->eq.eq_params,
  		       sizeof(audio->eq.eq_params));
  	} else {
  		cmd.eq_flag = AUDPP_CMD_EQ_FLAG_DIS;
  	}
  	return audpp_send_queue3(&cmd, sizeof(cmd));
  }
  
  static int audio_dsp_set_rx_iir(struct audio *audio)
  {
  	audpp_cmd_cfg_object_params_rx_iir cmd;
  
  	memset(&cmd, 0, sizeof(cmd));
  	cmd.common.comman_cfg = AUDPP_CMD_CFG_OBJ_UPDATE;
  	cmd.common.command_type = AUDPP_CMD_IIR_TUNING_FILTER;
  
  	if (audio->rx_iir_enable) {
  		cmd.active_flag = AUDPP_CMD_IIR_FLAG_ENA;
  		cmd.num_bands = audio->iir.num_bands;
  		memcpy(&cmd.iir_params, audio->iir.iir_params,
  		       sizeof(audio->iir.iir_params));
  	} else {
  		cmd.active_flag = AUDPP_CMD_IIR_FLAG_DIS;
  	}
  
  	return audpp_send_queue3(&cmd, sizeof(cmd));
  }
  
  /* ------------------- device --------------------- */
  
  static int audio_enable_adrc(struct audio *audio, int enable)
  {
  	if (audio->adrc_enable != enable) {
  		audio->adrc_enable = enable;
  		if (audio->running)
  			audio_dsp_set_adrc(audio);
  	}
  	return 0;
  }
  
  static int audio_enable_eq(struct audio *audio, int enable)
  {
  	if (audio->eq_enable != enable) {
  		audio->eq_enable = enable;
  		if (audio->running)
  			audio_dsp_set_eq(audio);
  	}
  	return 0;
  }
  
  static int audio_enable_rx_iir(struct audio *audio, int enable)
  {
  	if (audio->rx_iir_enable != enable) {
  		audio->rx_iir_enable = enable;
  		if (audio->running)
  			audio_dsp_set_rx_iir(audio);
  	}
  	return 0;
  }
  
  static void audio_flush(struct audio *audio)
  {
  	audio->out[0].used = 0;
  	audio->out[1].used = 0;
  	audio->out_head = 0;
  	audio->out_tail = 0;
  	audio->stopped = 0;
  }
  
  static long audio_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
  {
  	struct audio *audio = file->private_data;
  	int rc;
  
  	if (cmd == AUDIO_GET_STATS) {
  		struct msm_audio_stats stats;
  		stats.byte_count = atomic_read(&audio->out_bytes);
  		if (copy_to_user((void*) arg, &stats, sizeof(stats)))
  			return -EFAULT;
  		return 0;
  	}
  	if (cmd == AUDIO_SET_VOLUME) {
  		unsigned long flags;
  		spin_lock_irqsave(&audio->dsp_lock, flags);
  		audio->volume = arg;
  		if (audio->running)
  			audpp_set_volume_and_pan(6, arg, 0);
  		spin_unlock_irqrestore(&audio->dsp_lock, flags);
  	}
  
  	LOG(EV_IOCTL, cmd);
  	mutex_lock(&audio->lock);
  	switch (cmd) {
  	case AUDIO_START:
  		rc = audio_enable(audio);
  		break;
  	case AUDIO_STOP:
  		rc = audio_disable(audio);
  		audio->stopped = 1;
  		break;
  	case AUDIO_FLUSH:
  		if (audio->stopped) {
  			/* Make sure we're stopped and we wake any threads
  			 * that might be blocked holding the write_lock.
  			 * While audio->stopped write threads will always
  			 * exit immediately.
  			 */
  			wake_up(&audio->wait);
  			mutex_lock(&audio->write_lock);
  			audio_flush(audio);
  			mutex_unlock(&audio->write_lock);
  		}
  	case AUDIO_SET_CONFIG: {
  		struct msm_audio_config config;
  		if (copy_from_user(&config, (void*) arg, sizeof(config))) {
  			rc = -EFAULT;
  			break;
  		}
  		if (config.channel_count == 1) {
  			config.channel_count = AUDPP_CMD_PCM_INTF_MONO_V;
  		} else if (config.channel_count == 2) {
  			config.channel_count= AUDPP_CMD_PCM_INTF_STEREO_V;
  		} else {
  			rc = -EINVAL;
  			break;
  		}
  		audio->out_sample_rate = config.sample_rate;
  		audio->out_channel_mode = config.channel_count;
  		rc = 0;
  		break;
  	}
  	case AUDIO_GET_CONFIG: {
  		struct msm_audio_config config;
  		config.buffer_size = BUFSZ;
  		config.buffer_count = 2;
  		config.sample_rate = audio->out_sample_rate;
  		if (audio->out_channel_mode == AUDPP_CMD_PCM_INTF_MONO_V) {
  			config.channel_count = 1;
  		} else {
  			config.channel_count = 2;
  		}
  		config.unused[0] = 0;
  		config.unused[1] = 0;
  		config.unused[2] = 0;
  		config.unused[3] = 0;
  		if (copy_to_user((void*) arg, &config, sizeof(config))) {
  			rc = -EFAULT;
  		} else {
  			rc = 0;
  		}
  		break;
  	}
  	default:
  		rc = -EINVAL;
  	}
  	mutex_unlock(&audio->lock);
  	return rc;
  }
  
  static ssize_t audio_read(struct file *file, char __user *buf, size_t count, loff_t *pos)
  {
  	return -EINVAL;
  }
  
  static inline int rt_policy(int policy)
  {
  	if (unlikely(policy == SCHED_FIFO) || unlikely(policy == SCHED_RR))
  		return 1;
  	return 0;
  }
  
  static inline int task_has_rt_policy(struct task_struct *p)
  {
  	return rt_policy(p->policy);
  }
  
  static ssize_t audio_write(struct file *file, const char __user *buf,
  			   size_t count, loff_t *pos)
  {
  	struct sched_param s = { .sched_priority = 1 };
  	struct audio *audio = file->private_data;
  	unsigned long flags;
  	const char __user *start = buf;
  	struct buffer *frame;
  	size_t xfer;
  	int old_prio = current->rt_priority;
  	int old_policy = current->policy;
  	int cap_nice = cap_raised(current_cap(), CAP_SYS_NICE);
  	int rc = 0;
  
  	LOG(EV_WRITE, count | (audio->running << 28) | (audio->stopped << 24));
  
  	/* just for this write, set us real-time */
  	if (!task_has_rt_policy(current)) {
  		struct cred *new = prepare_creds();
  		cap_raise(new->cap_effective, CAP_SYS_NICE);
  		commit_creds(new);
  		sched_setscheduler(current, SCHED_RR, &s);
  	}
  
  	mutex_lock(&audio->write_lock);
  	while (count > 0) {
  		frame = audio->out + audio->out_head;
  
  		LOG(EV_WAIT_EVENT, 0);
  		rc = wait_event_interruptible(audio->wait,
  					      (frame->used == 0) || (audio->stopped));
  		LOG(EV_WAIT_EVENT, 1);
  
  		if (rc < 0)
  			break;
  		if (audio->stopped) {
  			rc = -EBUSY;
  			break;
  		}
  		xfer = count > frame->size ? frame->size : count;
  		if (copy_from_user(frame->data, buf, xfer)) {
  			rc = -EFAULT;
  			break;
  		}
  		frame->used = xfer;
  		audio->out_head ^= 1;
  		count -= xfer;
  		buf += xfer;
  
  		spin_lock_irqsave(&audio->dsp_lock, flags);
  		LOG(EV_FILL_BUFFER, audio->out_head ^ 1);
  		frame = audio->out + audio->out_tail;
  		if (frame->used && audio->out_needed) {
  			audio_dsp_send_buffer(audio, audio->out_tail, frame->used);
  			audio->out_tail ^= 1;
  			audio->out_needed--;
  		}
  		spin_unlock_irqrestore(&audio->dsp_lock, flags);
  	}
  
  	mutex_unlock(&audio->write_lock);
  
  	/* restore scheduling policy and priority */
  	if (!rt_policy(old_policy)) {
  		struct sched_param v = { .sched_priority = old_prio };
  		sched_setscheduler(current, old_policy, &v);
  		if (likely(!cap_nice)) {
  			struct cred *new = prepare_creds();
  			cap_lower(new->cap_effective, CAP_SYS_NICE);
  			commit_creds(new);
  			sched_setscheduler(current, SCHED_RR, &s);
  		}
  	}
  
  	LOG(EV_RETURN,(buf > start) ? (buf - start) : rc);
  	if (buf > start)
  		return buf - start;
  	return rc;
  }
  
  static int audio_release(struct inode *inode, struct file *file)
  {
  	struct audio *audio = file->private_data;
  
  	LOG(EV_OPEN, 0);
  	mutex_lock(&audio->lock);
  	audio_disable(audio);
  	audio_flush(audio);
  	audio->opened = 0;
  	mutex_unlock(&audio->lock);
  	htc_pwrsink_set(PWRSINK_AUDIO, 0);
  	return 0;
  }
  
  static struct audio the_audio;
  
  static int audio_open(struct inode *inode, struct file *file)
  {
  	struct audio *audio = &the_audio;
  	int rc;
  
  	mutex_lock(&audio->lock);
  
  	if (audio->opened) {
  		pr_err("audio: busy\n");
  		rc = -EBUSY;
  		goto done;
  	}
  
  	if (!audio->data) {
  		audio->data = dma_alloc_coherent(NULL, DMASZ,
  						 &audio->phys, GFP_KERNEL);
  		if (!audio->data) {
  			pr_err("audio: could not allocate DMA buffers\n");
  			rc = -ENOMEM;
  			goto done;
  		}
  	}
  
  	rc = audmgr_open(&audio->audmgr);
  	if (rc)
  		goto done;
  
  	audio->out_buffer_size = BUFSZ;
  	audio->out_sample_rate = 44100;
  	audio->out_channel_mode = AUDPP_CMD_PCM_INTF_STEREO_V;
  	audio->out_weight = 100;
  
  	audio->out[0].data = audio->data + 0;
  	audio->out[0].addr = audio->phys + 0;
  	audio->out[0].size = BUFSZ;
  
  	audio->out[1].data = audio->data + BUFSZ;
  	audio->out[1].addr = audio->phys + BUFSZ;
  	audio->out[1].size = BUFSZ;
  
  	audio->volume = 0x2000;
  
  	audio_flush(audio);
  
  	file->private_data = audio;
  	audio->opened = 1;
  	rc = 0;
  	LOG(EV_OPEN, 1);
  done:
  	mutex_unlock(&audio->lock);
  	return rc;
  }
  
  static long audpp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
  {
  	struct audio *audio = file->private_data;
  	int rc = 0, enable;
  	uint16_t enable_mask;
  
  	mutex_lock(&audio->lock);
  	switch (cmd) {
  	case AUDIO_ENABLE_AUDPP:
  		if (copy_from_user(&enable_mask, (void *) arg, sizeof(enable_mask)))
  			goto out_fault;
  
  		enable = (enable_mask & ADRC_ENABLE)? 1 : 0;
  		audio_enable_adrc(audio, enable);
  		enable = (enable_mask & EQ_ENABLE)? 1 : 0;
  		audio_enable_eq(audio, enable);
  		enable = (enable_mask & IIR_ENABLE)? 1 : 0;
  		audio_enable_rx_iir(audio, enable);
  		break;
  
  	case AUDIO_SET_ADRC:
  		if (copy_from_user(&audio->adrc, (void*) arg, sizeof(audio->adrc)))
  			goto out_fault;
  		break;
  
  	case AUDIO_SET_EQ:
  		if (copy_from_user(&audio->eq, (void*) arg, sizeof(audio->eq)))
  			goto out_fault;
  		break;
  
  	case AUDIO_SET_RX_IIR:
  		if (copy_from_user(&audio->iir, (void*) arg, sizeof(audio->iir)))
  			goto out_fault;
  		break;
  
  	default:
  		rc = -EINVAL;
  	}
  
  	goto out;
  
   out_fault:
  	rc = -EFAULT;
   out:
  	mutex_unlock(&audio->lock);
  	return rc;
  }
  
  static int audpp_open(struct inode *inode, struct file *file)
  {
  	struct audio *audio = &the_audio;
  
  	file->private_data = audio;
  	return 0;
  }
  
  static struct file_operations audio_fops = {
  	.owner		= THIS_MODULE,
  	.open		= audio_open,
  	.release	= audio_release,
  	.read		= audio_read,
  	.write		= audio_write,
  	.unlocked_ioctl	= audio_ioctl,
  };
  
  static struct file_operations audpp_fops = {
  	.owner		= THIS_MODULE,
  	.open		= audpp_open,
  	.unlocked_ioctl	= audpp_ioctl,
  };
  
  struct miscdevice audio_misc = {
  	.minor	= MISC_DYNAMIC_MINOR,
  	.name	= "msm_pcm_out",
  	.fops	= &audio_fops,
  };
  
  struct miscdevice audpp_misc = {
  	.minor	= MISC_DYNAMIC_MINOR,
  	.name	= "msm_pcm_ctl",
  	.fops	= &audpp_fops,
  };
  
  static int __init audio_init(void)
  {
  	mutex_init(&the_audio.lock);
  	mutex_init(&the_audio.write_lock);
  	spin_lock_init(&the_audio.dsp_lock);
  	init_waitqueue_head(&the_audio.wait);
  	wake_lock_init(&the_audio.wakelock, WAKE_LOCK_SUSPEND, "audio_pcm");
  	wake_lock_init(&the_audio.idlelock, WAKE_LOCK_IDLE, "audio_pcm_idle");
  	return (misc_register(&audio_misc) || misc_register(&audpp_misc));
  }
  
  device_initcall(audio_init);
  