ARM: tegra: Remove legacy i2s/spdif driver

Removing legacy i2s/spdif driver from tree.

These files are added to support customer projects prior
to moving over to alsa driver for audio.
There is no intention of using them and hence removing it.

Change-Id: I864dbc50e2e76ac16f40542460f63c8c8a0eff71
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Reviewed-on: http://git-master/r/91758
Reviewed-by: Simone Willett <swillett@nvidia.com>
Tested-by: Simone Willett <swillett@nvidia.com>

4 files changed, 0 insertions, 3161 deletions

diff --git a/arch/arm/mach-tegra/Kconfig b/arch/arm/mach-tegra/Kconfig
index c98080b3c64f..2de37ff9db93 100644
--- a/arch/arm/mach-tegra/Kconfig
+++ b/arch/arm/mach-tegra/Kconfig
@@ -392,13 +392,6 @@ config TEGRA_CONVSERVATIVE_GOV_ON_EARLYSUPSEND
 	help
 	 Also will restore to original cpu frequency governor when device is resumed
 
-config TEGRA_LEGACY_AUDIO
-	bool "Enable Tegra Legacy Audio APIs"
-	default n
-	help
-	  Say Y if you want to add support legacy (non-ALSA) audio APIs on
-	  Tegra. This will disable ALSA (ASoC) support.
-
 config TEGRA_STAT_MON
         bool "Enable H/W statistics monitor"
         depends on ARCH_TEGRA_2x_SOC
diff --git a/arch/arm/mach-tegra/Makefile b/arch/arm/mach-tegra/Makefile
index c54d056bb801..290ac3300f37 100644
--- a/arch/arm/mach-tegra/Makefile
+++ b/arch/arm/mach-tegra/Makefile
@@ -35,8 +35,6 @@ obj-y                                   += kfuse.o
 obj-y                                   += csi.o
 obj-$(CONFIG_TEGRA_SILICON_PLATFORM)    += tegra_odm_fuses.o
 obj-y                                   += i2c_error_recovery.o
-obj-$(CONFIG_TEGRA_LEGACY_AUDIO)        += tegra_i2s_audio.o
-obj-$(CONFIG_TEGRA_LEGACY_AUDIO)        += tegra_spdif_audio.o
 obj-y                                   += mc.o
 obj-$(CONFIG_TEGRA_STAT_MON)            += tegra2_statmon.o
 obj-$(CONFIG_USB_SUPPORT)               += usb_phy.o
diff --git a/arch/arm/mach-tegra/tegra_i2s_audio.c b/arch/arm/mach-tegra/tegra_i2s_audio.c
deleted file mode 100644
index fc790066694a..000000000000
--- a/arch/arm/mach-tegra/tegra_i2s_audio.c
+++ /dev/null
@@ -1,1965 +0,0 @@
-/*
- * arch/arm/mach-tegra/tegra_i2s_audio.c
- *
- * Copyright (C) 2010 Google, Inc.
- *
- * Author:
- *      Iliyan Malchev <malchev@google.com>
- *
- * 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.
- *
- */
-
-/* TODO:
-	-- replace make I2S_MAX_NUM_BUFS configurable through an ioctl
-*/
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/miscdevice.h>
-#include <linux/fs.h>
-#include <linux/mutex.h>
-#include <linux/clk.h>
-#include <linux/interrupt.h>
-#include <linux/slab.h>
-#include <linux/list.h>
-#include <linux/spinlock.h>
-#include <linux/uaccess.h>
-#include <linux/dma-mapping.h>
-#include <linux/dmapool.h>
-#include <linux/err.h>
-#include <linux/spi/spi.h>
-#include <linux/kfifo.h>
-#include <linux/debugfs.h>
-#include <linux/completion.h>
-#include <linux/platform_device.h>
-#include <linux/device.h>
-#include <linux/io.h>
-#include <linux/ktime.h>
-#include <linux/sysfs.h>
-#include <linux/wakelock.h>
-#include <linux/delay.h>
-#include <linux/tegra_audio.h>
-#include <linux/pm.h>
-#include <linux/workqueue.h>
-
-#include <mach/dma.h>
-#include <mach/iomap.h>
-#include <mach/i2s.h>
-#include <mach/audio.h>
-#include <mach/irqs.h>
-
-#include "clock.h"
-
-#define PCM_BUFFER_MAX_SIZE_ORDER	PAGE_SHIFT
-
-#define TEGRA_AUDIO_DSP_NONE		0
-#define TEGRA_AUDIO_DSP_PCM		1
-#define TEGRA_AUDIO_DSP_NETWORK		2
-#define TEGRA_AUDIO_DSP_TDM		3
-
-#define I2S_MAX_NUM_BUFS 4
-#define I2S_DEFAULT_TX_NUM_BUFS 2
-#define I2S_DEFAULT_RX_NUM_BUFS 2
-
-/* per stream (input/output) */
-struct audio_stream {
-	int opened;
-	struct mutex lock;
-
-	bool active; /* is DMA in progress? */
-	int num_bufs;
-	void *buffer[I2S_MAX_NUM_BUFS];
-	dma_addr_t buf_phy[I2S_MAX_NUM_BUFS];
-	struct completion comp[I2S_MAX_NUM_BUFS];
-	struct tegra_dma_req dma_req[I2S_MAX_NUM_BUFS];
-	int last_queued;
-
-	int i2s_fifo_atn_level;
-
-	struct tegra_dma_channel *dma_chan;
-	bool stop;
-	struct completion stop_completion;
-	spinlock_t dma_req_lock;
-
-	struct work_struct allow_suspend_work;
-	struct wake_lock wake_lock;
-	char wake_lock_name[100];
-};
-
-/* per i2s controller */
-struct audio_driver_state {
-	struct list_head next;
-
-	struct platform_device *pdev;
-	struct tegra_audio_platform_data *pdata;
-	phys_addr_t i2s_phys;
-	unsigned long i2s_base;
-
-	unsigned long dma_req_sel;
-
-	int irq;
-	struct tegra_audio_in_config in_config;
-
-	struct miscdevice misc_out;
-	struct miscdevice misc_out_ctl;
-	struct audio_stream out;
-
-	struct miscdevice misc_in;
-	struct miscdevice misc_in_ctl;
-	struct audio_stream in;
-
-	/* Control for whole I2S (Data format, etc.) */
-	struct miscdevice misc_ctl;
-	unsigned int bit_format;
-};
-
-static inline bool pending_buffer_requests(struct audio_stream *stream)
-{
-	int i;
-	for (i = 0; i < stream->num_bufs; i++)
-		if (!completion_done(&stream->comp[i]))
-			return true;
-	return false;
-}
-
-static inline int buf_size(struct audio_stream *s __attribute__((unused)))
-{
-	return 1 << PCM_BUFFER_MAX_SIZE_ORDER;
-}
-
-static inline struct audio_driver_state *ads_from_misc_out(struct file *file)
-{
-	struct miscdevice *m = file->private_data;
-	struct audio_driver_state *ads =
-			container_of(m, struct audio_driver_state, misc_out);
-	BUG_ON(!ads);
-	return ads;
-}
-
-static inline struct audio_driver_state *ads_from_misc_out_ctl(
-		struct file *file)
-{
-	struct miscdevice *m = file->private_data;
-	struct audio_driver_state *ads =
-			container_of(m, struct audio_driver_state,
-					misc_out_ctl);
-	BUG_ON(!ads);
-	return ads;
-}
-
-static inline struct audio_driver_state *ads_from_misc_in(struct file *file)
-{
-	struct miscdevice *m = file->private_data;
-	struct audio_driver_state *ads =
-			container_of(m, struct audio_driver_state, misc_in);
-	BUG_ON(!ads);
-	return ads;
-}
-
-static inline struct audio_driver_state *ads_from_misc_in_ctl(
-		struct file *file)
-{
-	struct miscdevice *m = file->private_data;
-	struct audio_driver_state *ads =
-			container_of(m, struct audio_driver_state,
-					misc_in_ctl);
-	BUG_ON(!ads);
-	return ads;
-}
-
-static inline struct audio_driver_state *ads_from_misc_ctl(
-		struct file *file)
-{
-	struct miscdevice *m = file->private_data;
-	struct audio_driver_state *ads =
-			container_of(m, struct audio_driver_state,
-					misc_ctl);
-	BUG_ON(!ads);
-	return ads;
-}
-
-static inline struct audio_driver_state *ads_from_out(
-			struct audio_stream *aos)
-{
-	return container_of(aos, struct audio_driver_state, out);
-}
-
-static inline struct audio_driver_state *ads_from_in(
-			struct audio_stream *ais)
-{
-	return container_of(ais, struct audio_driver_state, in);
-}
-
-static inline void prevent_suspend(struct audio_stream *as)
-{
-	pr_debug("%s\n", __func__);
-	cancel_work_sync(&as->allow_suspend_work);
-	wake_lock(&as->wake_lock);
-}
-
-static void allow_suspend_worker(struct work_struct *w)
-{
-	struct audio_stream *as = container_of(w,
-			struct audio_stream, allow_suspend_work);
-	pr_debug("%s\n", __func__);
-	wake_unlock(&as->wake_lock);
-}
-
-static inline void allow_suspend(struct audio_stream *as)
-{
-	schedule_work(&as->allow_suspend_work);
-}
-
-#define I2S_I2S_FIFO_TX_BUSY	I2S_I2S_STATUS_FIFO1_BSY
-#define I2S_I2S_FIFO_TX_QS	I2S_I2S_STATUS_QS_FIFO1
-#define I2S_I2S_FIFO_TX_ERR	I2S_I2S_STATUS_FIFO1_ERR
-
-#define I2S_I2S_FIFO_RX_BUSY	I2S_I2S_STATUS_FIFO2_BSY
-#define I2S_I2S_FIFO_RX_QS	I2S_I2S_STATUS_QS_FIFO2
-#define I2S_I2S_FIFO_RX_ERR	I2S_I2S_STATUS_FIFO2_ERR
-
-#define I2S_FIFO_ERR (I2S_I2S_STATUS_FIFO1_ERR | I2S_I2S_STATUS_FIFO2_ERR)
-
-static inline void i2s_writel(unsigned long base, u32 val, u32 reg)
-{
-	writel(val, base + reg);
-}
-
-static inline u32 i2s_readl(unsigned long base, u32 reg)
-{
-	return readl(base + reg);
-}
-
-static inline void i2s_fifo_write(unsigned long base, int fifo, u32 data)
-{
-	i2s_writel(base, data, fifo ? I2S_I2S_FIFO2_0 : I2S_I2S_FIFO1_0);
-}
-
-static inline u32 i2s_fifo_read(unsigned long base, int fifo)
-{
-	return i2s_readl(base, fifo ? I2S_I2S_FIFO2_0 : I2S_I2S_FIFO1_0);
-}
-
-static int i2s_set_channel_bit_count(unsigned long base,
-			int sampling, int bitclk)
-{
-	u32 val;
-	int bitcnt = bitclk / (2 * sampling) - 1;
-
-	if (bitcnt < 0 || bitcnt >= 1<<11) {
-		pr_err("%s: bit count %d is out of bounds\n", __func__,
-			bitcnt);
-		return -EINVAL;
-	}
-
-	val = bitcnt;
-	if (bitclk % (2 * sampling)) {
-		pr_info("%s: enabling non-symmetric mode\n", __func__);
-		val |= I2S_I2S_TIMING_NON_SYM_ENABLE;
-	}
-
-	pr_debug("%s: I2S_I2S_TIMING_0 = %08x\n", __func__, val);
-	i2s_writel(base, val, I2S_I2S_TIMING_0);
-	return 0;
-}
-
-static void i2s_set_fifo_mode(unsigned long base, int fifo, int tx)
-{
-	u32 val = i2s_readl(base, I2S_I2S_CTRL_0);
-	if (fifo == 0) {
-		val &= ~I2S_I2S_CTRL_FIFO1_RX_ENABLE;
-		val |= (!tx) ? I2S_I2S_CTRL_FIFO1_RX_ENABLE : 0;
-	} else {
-		val &= ~I2S_I2S_CTRL_FIFO2_TX_ENABLE;
-		val |= tx ? I2S_I2S_CTRL_FIFO2_TX_ENABLE : 0;
-	}
-	i2s_writel(base, val, I2S_I2S_CTRL_0);
-}
-
-static int i2s_fifo_set_attention_level(unsigned long base,
-			int fifo, unsigned level)
-{
-	u32 val;
-
-	if (level > I2S_FIFO_ATN_LVL_TWELVE_SLOTS) {
-		pr_err("%s: invalid fifo level selector %d\n", __func__,
-			level);
-		return -EINVAL;
-	}
-
-	val = i2s_readl(base, I2S_I2S_FIFO_SCR_0);
-
-	if (!fifo) {
-		val &= ~I2S_I2S_FIFO_SCR_FIFO1_ATN_LVL_MASK;
-		val |= level << I2S_FIFO1_ATN_LVL_SHIFT;
-	} else {
-		val &= ~I2S_I2S_FIFO_SCR_FIFO2_ATN_LVL_MASK;
-		val |= level << I2S_FIFO2_ATN_LVL_SHIFT;
-	}
-
-	i2s_writel(base, val, I2S_I2S_FIFO_SCR_0);
-	return 0;
-}
-
-static void i2s_fifo_enable(unsigned long base, int fifo, int on)
-{
-	u32 val = i2s_readl(base, I2S_I2S_CTRL_0);
-	if (!fifo) {
-		val &= ~I2S_I2S_CTRL_FIFO1_ENABLE;
-		val |= on ? I2S_I2S_CTRL_FIFO1_ENABLE : 0;
-	} else {
-		val &= ~I2S_I2S_CTRL_FIFO2_ENABLE;
-		val |= on ? I2S_I2S_CTRL_FIFO2_ENABLE : 0;
-	}
-
-	i2s_writel(base, val, I2S_I2S_CTRL_0);
-}
-
-#if 0
-static bool i2s_is_fifo_enabled(unsigned long base, int fifo)
-{
-	u32 val = i2s_readl(base, I2S_I2S_CTRL_0);
-	if (!fifo)
-		return !!(val & I2S_I2S_CTRL_FIFO1_ENABLE);
-	return !!(val & I2S_I2S_CTRL_FIFO2_ENABLE);
-}
-#endif
-
-static void i2s_fifo_clear(unsigned long base, int fifo)
-{
-	u32 val = i2s_readl(base, I2S_I2S_FIFO_SCR_0);
-	if (!fifo) {
-		val &= ~I2S_I2S_FIFO_SCR_FIFO1_CLR;
-		val |= I2S_I2S_FIFO_SCR_FIFO1_CLR;
-#if 0
-		/* Per Nvidia, reduces pop on the next run. */
-		if (!(val & I2S_I2S_CTRL_FIFO1_RX_ENABLE)) {
-			int cnt = 16;
-			while (cnt--)
-				i2s_writel(base, 0, I2S_I2S_FIFO1_0);
-		}
-#endif
-	} else {
-		val &= ~I2S_I2S_FIFO_SCR_FIFO2_CLR;
-		val |= I2S_I2S_FIFO_SCR_FIFO2_CLR;
-	}
-
-	i2s_writel(base, val, I2S_I2S_FIFO_SCR_0);
-}
-
-static void i2s_set_master(unsigned long base, int master)
-{
-	u32 val = i2s_readl(base, I2S_I2S_CTRL_0);
-	val &= ~I2S_I2S_CTRL_MASTER_ENABLE;
-	val |= master ? I2S_I2S_CTRL_MASTER_ENABLE : 0;
-	i2s_writel(base, val, I2S_I2S_CTRL_0);
-}
-
-static int i2s_set_dsp_mode(unsigned long base, unsigned int mode)
-{
-	u32 val;
-	if (mode > TEGRA_AUDIO_DSP_TDM) {
-		pr_err("%s: invalid mode %d.\n", __func__, mode);
-		return -EINVAL;
-	}
-	if (mode == TEGRA_AUDIO_DSP_TDM) {
-		pr_err("TEGRA_AUDIO_DSP_TDM not implemented.\n");
-		return -EINVAL;
-	}
-
-	/* Disable unused modes */
-	if (mode != TEGRA_AUDIO_DSP_PCM) {
-		/* Disable PCM mode */
-		val = i2s_readl(base, I2S_I2S_PCM_CTRL_0);
-		val &= ~(I2S_I2S_PCM_CTRL_TRM_MODE |
-				I2S_I2S_PCM_CTRL_RCV_MODE);
-		i2s_writel(base, val, I2S_I2S_PCM_CTRL_0);
-	}
-	if (mode != TEGRA_AUDIO_DSP_NETWORK) {
-		/* Disable Network mode */
-		val = i2s_readl(base, I2S_I2S_NW_CTRL_0);
-		val &= ~(I2S_I2S_NW_CTRL_TRM_TLPHY_MODE |
-				I2S_I2S_NW_CTRL_RCV_TLPHY_MODE);
-		i2s_writel(base, val, I2S_I2S_NW_CTRL_0);
-	}
-
-	/* Enable the selected mode. */
-	switch (mode) {
-	case TEGRA_AUDIO_DSP_NETWORK:
-		/* Set DSP Network (Telephony) Mode */
-		val = i2s_readl(base, I2S_I2S_NW_CTRL_0);
-		val |= I2S_I2S_NW_CTRL_TRM_TLPHY_MODE |
-				I2S_I2S_NW_CTRL_RCV_TLPHY_MODE;
-		i2s_writel(base, val, I2S_I2S_NW_CTRL_0);
-		break;
-	case TEGRA_AUDIO_DSP_PCM:
-		/* Set DSP PCM Mode */
-		val = i2s_readl(base, I2S_I2S_PCM_CTRL_0);
-		val |= I2S_I2S_PCM_CTRL_TRM_MODE |
-				I2S_I2S_PCM_CTRL_RCV_MODE;
-		i2s_writel(base, val, I2S_I2S_PCM_CTRL_0);
-		break;
-	}
-
-	return 0;
-}
-
-static int i2s_set_bit_format(unsigned long base, unsigned fmt)
-{
-	u32 val;
-
-	if (fmt > I2S_BIT_FORMAT_DSP) {
-		pr_err("%s: invalid bit-format selector %d\n", __func__, fmt);
-		return -EINVAL;
-	}
-
-	val = i2s_readl(base, I2S_I2S_CTRL_0);
-	val &= ~I2S_I2S_CTRL_BIT_FORMAT_MASK;
-	val |= fmt << I2S_BIT_FORMAT_SHIFT;
-	i2s_writel(base, val, I2S_I2S_CTRL_0);
-	/* For DSP format, select DSP PCM mode. */
-	/* PCM mode and Network Mode slot 0 are effectively identical. */
-	if (fmt == I2S_BIT_FORMAT_DSP)
-		i2s_set_dsp_mode(base, TEGRA_AUDIO_DSP_PCM);
-	else
-		i2s_set_dsp_mode(base, TEGRA_AUDIO_DSP_NONE);
-
-	return 0;
-}
-
-static int i2s_set_bit_size(unsigned long base, unsigned bit_size)
-{
-	u32 val = i2s_readl(base, I2S_I2S_CTRL_0);
-	val &= ~I2S_I2S_CTRL_BIT_SIZE_MASK;
-
-	if (bit_size > I2S_BIT_SIZE_32) {
-		pr_err("%s: invalid bit_size selector %d\n", __func__,
-			bit_size);
-		return -EINVAL;
-	}
-
-	val |= bit_size << I2S_BIT_SIZE_SHIFT;
-
-	i2s_writel(base, val, I2S_I2S_CTRL_0);
-	return 0;
-}
-
-static int i2s_set_fifo_format(unsigned long base, unsigned fmt)
-{
-	u32 val = i2s_readl(base, I2S_I2S_CTRL_0);
-	val &= ~I2S_I2S_CTRL_FIFO_FORMAT_MASK;
-
-	if (fmt > I2S_FIFO_32 && fmt != I2S_FIFO_PACKED) {
-		pr_err("%s: invalid fmt selector %d\n", __func__, fmt);
-		return -EINVAL;
-	}
-
-	val |= fmt << I2S_FIFO_SHIFT;
-
-	i2s_writel(base, val, I2S_I2S_CTRL_0);
-	return 0;
-}
-
-static void i2s_set_left_right_control_polarity(unsigned long base,
-		int high_low)
-{
-	u32 val = i2s_readl(base, I2S_I2S_CTRL_0);
-	val &= ~I2S_I2S_CTRL_L_R_CTRL;
-	val |= high_low ? I2S_I2S_CTRL_L_R_CTRL : 0;
-	i2s_writel(base, val, I2S_I2S_CTRL_0);
-}
-
-#if 0
-static void i2s_set_fifo_irq_on_err(unsigned long base, int fifo, int on)
-{
-	u32 val = i2s_readl(base, I2S_I2S_CTRL_0);
-	if (!fifo) {
-		val &= ~I2S_I2S_IE_FIFO1_ERR;
-		val |= on ? I2S_I2S_IE_FIFO1_ERR : 0;
-	} else {
-		val &= ~I2S_I2S_IE_FIFO2_ERR;
-		val |= on ? I2S_I2S_IE_FIFO2_ERR : 0;
-	}
-	i2s_writel(base, val, I2S_I2S_CTRL_0);
-}
-
-static void i2s_set_fifo_irq_on_qe(unsigned long base, int fifo, int on)
-{
-	u32 val = i2s_readl(base, I2S_I2S_CTRL_0);
-	if (!fifo) {
-		val &= ~I2S_I2S_QE_FIFO1;
-		val |= on ? I2S_I2S_QE_FIFO1 : 0;
-	} else {
-		val &= ~I2S_I2S_QE_FIFO2;
-		val |= on ? I2S_I2S_QE_FIFO2 : 0;
-	}
-	i2s_writel(base, val, I2S_I2S_CTRL_0);
-}
-#endif
-
-static void i2s_enable_fifos(unsigned long base, int on)
-{
-	u32 val = i2s_readl(base, I2S_I2S_CTRL_0);
-	if (on)
-		val |= I2S_I2S_QE_FIFO1 | I2S_I2S_QE_FIFO2 |
-		       I2S_I2S_IE_FIFO1_ERR | I2S_I2S_IE_FIFO2_ERR;
-	else
-		val &= ~(I2S_I2S_QE_FIFO1 | I2S_I2S_QE_FIFO2 |
-			 I2S_I2S_IE_FIFO1_ERR | I2S_I2S_IE_FIFO2_ERR);
-
-	i2s_writel(base, val, I2S_I2S_CTRL_0);
-}
-
-static inline u32 i2s_get_status(unsigned long base)
-{
-	return i2s_readl(base, I2S_I2S_STATUS_0);
-}
-
-static inline u32 i2s_get_control(unsigned long base)
-{
-	return i2s_readl(base, I2S_I2S_CTRL_0);
-}
-
-static inline void i2s_ack_status(unsigned long base)
-{
-	return i2s_writel(base, i2s_readl(base, I2S_I2S_STATUS_0),
-				I2S_I2S_STATUS_0);
-}
-
-static inline u32 i2s_get_fifo_scr(unsigned long base)
-{
-	return i2s_readl(base, I2S_I2S_FIFO_SCR_0);
-}
-
-static inline phys_addr_t i2s_get_fifo_phy_base(unsigned long phy_base,
-		int fifo)
-{
-	return phy_base + (fifo ? I2S_I2S_FIFO2_0 : I2S_I2S_FIFO1_0);
-}
-
-static inline u32 i2s_get_fifo_full_empty_count(unsigned long base, int fifo)
-{
-	u32 val = i2s_readl(base, I2S_I2S_FIFO_SCR_0);
-
-	if (!fifo)
-		val = val >> I2S_I2S_FIFO_SCR_FIFO1_FULL_EMPTY_COUNT_SHIFT;
-	else
-		val = val >> I2S_I2S_FIFO_SCR_FIFO2_FULL_EMPTY_COUNT_SHIFT;
-
-	return val & I2S_I2S_FIFO_SCR_FIFO_FULL_EMPTY_COUNT_MASK;
-}
-
-static int i2s_configure(struct platform_device *pdev)
-{
-	struct tegra_audio_platform_data *pdata = pdev->dev.platform_data;
-	struct audio_driver_state *state = pdata->driver_data;
-	bool master;
-	struct clk *i2s_clk;
-	int master_clk;
-
-	/* dev_info(&pdev->dev, "%s\n", __func__); */
-
-	if (!state)
-		return -ENOMEM;
-
-	/* disable interrupts from I2S */
-	i2s_enable_fifos(state->i2s_base, 0);
-	i2s_fifo_clear(state->i2s_base, I2S_FIFO_TX);
-	i2s_fifo_clear(state->i2s_base, I2S_FIFO_RX);
-	i2s_set_left_right_control_polarity(state->i2s_base, 0); /* default */
-
-	i2s_clk = clk_get(&pdev->dev, NULL);
-	if (!i2s_clk) {
-		dev_err(&pdev->dev, "%s: could not get i2s clock\n",
-			__func__);
-		return -EIO;
-	}
-
-	master = state->bit_format == TEGRA_AUDIO_BIT_FORMAT_DSP ?
-			state->pdata->dsp_master : state->pdata->i2s_master;
-
-
-	master_clk = state->bit_format == TEGRA_AUDIO_BIT_FORMAT_DSP ?
-			state->pdata->dsp_master_clk :
-			state->pdata->i2s_master_clk;
-#define I2S_CLK_TO_BITCLK_RATIO 2  /* Todo, Bitclk based on 2X clock? */
-	if (master)
-		i2s_set_channel_bit_count(state->i2s_base, master_clk,
-			clk_get_rate(i2s_clk)*I2S_CLK_TO_BITCLK_RATIO);
-	i2s_set_master(state->i2s_base, master);
-
-	i2s_set_fifo_mode(state->i2s_base, I2S_FIFO_TX, 1);
-	i2s_set_fifo_mode(state->i2s_base, I2S_FIFO_RX, 0);
-
-	if (state->bit_format == TEGRA_AUDIO_BIT_FORMAT_DSP)
-		i2s_set_bit_format(state->i2s_base, I2S_BIT_FORMAT_DSP);
-	else
-		i2s_set_bit_format(state->i2s_base, state->pdata->mode);
-	i2s_set_bit_size(state->i2s_base, state->pdata->bit_size);
-	i2s_set_fifo_format(state->i2s_base, state->pdata->fifo_fmt);
-
-	return 0;
-}
-
-static int init_stream_buffer(struct audio_stream *, int);
-
-static int setup_dma(struct audio_driver_state *, int);
-static void tear_down_dma(struct audio_driver_state *, int);
-static void stop_dma_playback(struct audio_stream *);
-static int start_dma_recording(struct audio_stream *, int);
-static void stop_dma_recording(struct audio_stream *);
-
-struct sound_ops {
-	int (*setup)(struct audio_driver_state *, int);
-	void (*tear_down)(struct audio_driver_state *, int);
-	void (*stop_playback)(struct audio_stream *);
-	int (*start_recording)(struct audio_stream *, int);
-	void (*stop_recording)(struct audio_stream *);
-};
-
-static const struct sound_ops dma_sound_ops = {
-	.setup = setup_dma,
-	.tear_down = tear_down_dma,
-	.stop_playback = stop_dma_playback,
-	.start_recording = start_dma_recording,
-	.stop_recording = stop_dma_recording,
-};
-
-static const struct sound_ops *sound_ops = &dma_sound_ops;
-
-static int start_recording_if_necessary(struct audio_stream *ais, int size)
-{
-	int rc = 0;
-	unsigned long flags;
-	prevent_suspend(ais);
-	spin_lock_irqsave(&ais->dma_req_lock, flags);
-	if (!ais->stop && !pending_buffer_requests(ais)) {
-		/* pr_debug("%s: starting recording\n", __func__); */
-		rc = sound_ops->start_recording(ais, size);
-		if (rc) {
-			pr_err("%s start_recording() failed\n", __func__);
-			allow_suspend(ais);
-		}
-	}
-	spin_unlock_irqrestore(&ais->dma_req_lock, flags);
-	return rc;
-}
-
-static bool stop_playback_if_necessary(struct audio_stream *aos)
-{
-	unsigned long flags;
-	spin_lock_irqsave(&aos->dma_req_lock, flags);
-	pr_debug("%s\n", __func__);
-	if (!pending_buffer_requests(aos)) {
-		pr_debug("%s: no more data to play back\n", __func__);
-		sound_ops->stop_playback(aos);
-		spin_unlock_irqrestore(&aos->dma_req_lock, flags);
-		allow_suspend(aos);
-		return true;
-	}
-	spin_unlock_irqrestore(&aos->dma_req_lock, flags);
-
-	return false;
-}
-
-/* playback and recording */
-static bool wait_till_stopped(struct audio_stream *as)
-{
-	int rc;
-	pr_debug("%s: wait for completion\n", __func__);
-	rc = wait_for_completion_timeout(
-			&as->stop_completion, HZ);
-	if (!rc)
-		pr_err("%s: wait timed out", __func__);
-	if (rc < 0)
-		pr_err("%s: wait error %d\n", __func__, rc);
-	allow_suspend(as);
-	pr_debug("%s: done: %d\n", __func__, rc);
-	return true;
-}
-
-/* Ask for playback and recording to stop.  The _nosync means that
- * as->lock has to be locked by the caller.
- */
-static void request_stop_nosync(struct audio_stream *as)
-{
-	int i;
-	pr_debug("%s\n", __func__);
-	if (!as->stop) {
-		as->stop = true;
-		if (pending_buffer_requests(as))
-			wait_till_stopped(as);
-		for (i = 0; i < as->num_bufs; i++) {
-			init_completion(&as->comp[i]);
-			complete(&as->comp[i]);
-		}
-	}
-	if (!tegra_dma_is_empty(as->dma_chan))
-		pr_err("%s: DMA not empty!\n", __func__);
-	/* Stop the DMA then dequeue anything that's in progress. */
-	tegra_dma_cancel(as->dma_chan);
-	as->active = false; /* applies to recording only */
-	pr_debug("%s: done\n", __func__);
-}
-
-static void setup_dma_tx_request(struct tegra_dma_req *req,
-		struct audio_stream *aos);
-
-static void setup_dma_rx_request(struct tegra_dma_req *req,
-		struct audio_stream *ais);
-
-static int setup_dma(struct audio_driver_state *ads, int mask)
-{
-	int rc, i;
-	pr_info("%s\n", __func__);
-
-	if (mask & TEGRA_AUDIO_ENABLE_TX) {
-		/* setup audio playback */
-		for (i = 0; i < ads->out.num_bufs; i++) {
-			ads->out.buf_phy[i] = dma_map_single(&ads->pdev->dev,
-					ads->out.buffer[i],
-					1 << PCM_BUFFER_MAX_SIZE_ORDER,
-					DMA_TO_DEVICE);
-			BUG_ON(!ads->out.buf_phy[i]);
-			setup_dma_tx_request(&ads->out.dma_req[i], &ads->out);
-			ads->out.dma_req[i].source_addr = ads->out.buf_phy[i];
-		}
-		ads->out.dma_chan = tegra_dma_allocate_channel(
-				TEGRA_DMA_MODE_CONTINUOUS_SINGLE,
-				"i2s_tx_req_%d", ads->dma_req_sel);
-		if (!ads->out.dma_chan) {
-			pr_err("%s: error alloc output DMA channel: %ld\n",
-				__func__, PTR_ERR(ads->out.dma_chan));
-			rc = -ENODEV;
-			goto fail_tx;
-		}
-	}
-
-	if (mask & TEGRA_AUDIO_ENABLE_RX) {
-		/* setup audio recording */
-		for (i = 0; i < ads->in.num_bufs; i++) {
-			ads->in.buf_phy[i] = dma_map_single(&ads->pdev->dev,
-					ads->in.buffer[i],
-					1 << PCM_BUFFER_MAX_SIZE_ORDER,
-					DMA_FROM_DEVICE);
-			BUG_ON(!ads->in.buf_phy[i]);
-			setup_dma_rx_request(&ads->in.dma_req[i], &ads->in);
-			ads->in.dma_req[i].dest_addr = ads->in.buf_phy[i];
-		}
-		ads->in.dma_chan = tegra_dma_allocate_channel(
-				TEGRA_DMA_MODE_CONTINUOUS_SINGLE,
-				"i2s_rx_req_%d", ads->dma_req_sel);
-		if (!ads->in.dma_chan) {
-			pr_err("%s: error allocating input DMA channel: %ld\n",
-				__func__, PTR_ERR(ads->in.dma_chan));
-			rc = -ENODEV;
-			goto fail_rx;
-		}
-	}
-
-	return 0;
-
-fail_rx:
-	if (mask & TEGRA_AUDIO_ENABLE_RX) {
-		for (i = 0; i < ads->in.num_bufs; i++) {
-			dma_unmap_single(&ads->pdev->dev, ads->in.buf_phy[i],
-					1 << PCM_BUFFER_MAX_SIZE_ORDER,
-					DMA_FROM_DEVICE);
-			ads->in.buf_phy[i] = 0;
-		}
-		tegra_dma_free_channel(ads->in.dma_chan);
-		ads->in.dma_chan = 0;
-	}
-fail_tx:
-	if (mask & TEGRA_AUDIO_ENABLE_TX) {
-		for (i = 0; i < ads->out.num_bufs; i++) {
-			dma_unmap_single(&ads->pdev->dev, ads->out.buf_phy[i],
-					1 << PCM_BUFFER_MAX_SIZE_ORDER,
-					DMA_TO_DEVICE);
-			ads->out.buf_phy[i] = 0;
-		}
-		tegra_dma_free_channel(ads->out.dma_chan);
-		ads->out.dma_chan = 0;
-	}
-
-	return rc;
-}
-
-static void tear_down_dma(struct audio_driver_state *ads, int mask)
-{
-	int i;
-	pr_info("%s\n", __func__);
-
-	if (mask & TEGRA_AUDIO_ENABLE_TX) {
-		tegra_dma_free_channel(ads->out.dma_chan);
-		for (i = 0; i < ads->out.num_bufs; i++) {
-			dma_unmap_single(&ads->pdev->dev, ads->out.buf_phy[i],
-					buf_size(&ads->out),
-					DMA_TO_DEVICE);
-			ads->out.buf_phy[i] = 0;
-		}
-	}
-	ads->out.dma_chan = NULL;
-
-	if (mask & TEGRA_AUDIO_ENABLE_RX) {
-		tegra_dma_free_channel(ads->in.dma_chan);
-		for (i = 0; i < ads->in.num_bufs; i++) {
-			dma_unmap_single(&ads->pdev->dev, ads->in.buf_phy[i],
-					buf_size(&ads->in),
-					DMA_FROM_DEVICE);
-			ads->in.buf_phy[i] = 0;
-		}
-	}
-	ads->in.dma_chan = NULL;
-}
-
-static void dma_tx_complete_callback(struct tegra_dma_req *req)
-{
-	unsigned long flags;
-	struct audio_stream *aos = req->dev;
-	unsigned req_num;
-
-	spin_lock_irqsave(&aos->dma_req_lock, flags);
-
-	req_num = req - aos->dma_req;
-	pr_debug("%s: completed buffer %d size %d\n", __func__,
-			req_num, req->bytes_transferred);
-	BUG_ON(req_num >= aos->num_bufs);
-
-	complete(&aos->comp[req_num]);
-
-	if (!pending_buffer_requests(aos)) {
-		pr_debug("%s: Playback underflow\n", __func__);
-		complete(&aos->stop_completion);
-	}
-
-	spin_unlock_irqrestore(&aos->dma_req_lock, flags);
-}
-
-static void dma_rx_complete_callback(struct tegra_dma_req *req)
-{
-	unsigned long flags;
-	struct audio_stream *ais = req->dev;
-	unsigned req_num;
-
-	spin_lock_irqsave(&ais->dma_req_lock, flags);
-
-	req_num = req - ais->dma_req;
-	pr_debug("%s: completed buffer %d size %d\n", __func__,
-			req_num, req->bytes_transferred);
-	BUG_ON(req_num >= ais->num_bufs);
-
-	complete(&ais->comp[req_num]);
-
-	if (!pending_buffer_requests(ais))
-		pr_debug("%s: Capture overflow\n", __func__);
-
-	spin_unlock_irqrestore(&ais->dma_req_lock, flags);
-}
-
-static void setup_dma_tx_request(struct tegra_dma_req *req,
-		struct audio_stream *aos)
-{
-	struct audio_driver_state *ads = ads_from_out(aos);
-
-	memset(req, 0, sizeof(*req));
-
-	req->complete = dma_tx_complete_callback;
-	req->dev = aos;
-	req->to_memory = false;
-	req->dest_addr = i2s_get_fifo_phy_base(ads->i2s_phys, I2S_FIFO_TX);
-	req->dest_wrap = 4;
-	if (ads->bit_format == TEGRA_AUDIO_BIT_FORMAT_DSP)
-		req->dest_bus_width = ads->pdata->dsp_bus_width;
-	else
-		req->dest_bus_width = ads->pdata->i2s_bus_width;
-	req->source_bus_width = 32;
-	req->source_wrap = 0;
-	req->req_sel = ads->dma_req_sel;
-}
-
-static void setup_dma_rx_request(struct tegra_dma_req *req,
-		struct audio_stream *ais)
-{
-	struct audio_driver_state *ads = ads_from_in(ais);
-
-	memset(req, 0, sizeof(*req));
-
-	req->complete = dma_rx_complete_callback;
-	req->dev = ais;
-	req->to_memory = true;
-	req->source_addr = i2s_get_fifo_phy_base(ads->i2s_phys, I2S_FIFO_RX);
-	req->source_wrap = 4;
-	if (ads->bit_format == TEGRA_AUDIO_BIT_FORMAT_DSP)
-		req->source_bus_width = ads->pdata->dsp_bus_width;
-	else
-		req->source_bus_width = ads->pdata->i2s_bus_width;
-	req->dest_bus_width = 32;
-	req->dest_wrap = 0;
-	req->req_sel = ads->dma_req_sel;
-}
-
-static int start_playback(struct audio_stream *aos,
-			struct tegra_dma_req *req)
-{
-	int rc;
-	unsigned long flags;
-	struct audio_driver_state *ads = ads_from_out(aos);
-
-	pr_debug("%s: (writing %d)\n",
-			__func__, req->size);
-
-	spin_lock_irqsave(&aos->dma_req_lock, flags);
-#if 0
-	i2s_fifo_clear(ads->i2s_base, I2S_FIFO_TX);
-#endif
-	i2s_fifo_set_attention_level(ads->i2s_base,
-			I2S_FIFO_TX, aos->i2s_fifo_atn_level);
-
-	i2s_fifo_enable(ads->i2s_base, I2S_FIFO_TX, 1);
-
-	rc = tegra_dma_enqueue_req(aos->dma_chan, req);
-	spin_unlock_irqrestore(&aos->dma_req_lock, flags);
-
-	if (rc)
-		pr_err("%s: could not enqueue TX DMA req\n", __func__);
-	return rc;
-}
-
-/* Called with aos->dma_req_lock taken. */
-static void stop_dma_playback(struct audio_stream *aos)
-{
-	int spin = 0;
-	struct audio_driver_state *ads = ads_from_out(aos);
-	pr_debug("%s\n", __func__);
-	i2s_fifo_enable(ads->i2s_base, I2S_FIFO_TX, 0);
-	while ((i2s_get_status(ads->i2s_base) & I2S_I2S_FIFO_TX_BUSY) &&
-			spin < 100) {
-		udelay(10);
-		if (spin++ > 50)
-			pr_info("%s: spin %d\n", __func__, spin);
-	}
-	if (spin == 100)
-		pr_warn("%s: spinny\n", __func__);
-}
-
-/* This function may be called from either interrupt or process context. */
-/* Called with ais->dma_req_lock taken. */
-static int start_dma_recording(struct audio_stream *ais, int size)
-{
-	int i;
-	struct audio_driver_state *ads = ads_from_in(ais);
-
-	pr_debug("%s\n", __func__);
-
-	BUG_ON(pending_buffer_requests(ais));
-
-	for (i = 0; i < ais->num_bufs; i++) {
-		init_completion(&ais->comp[i]);
-		ais->dma_req[i].dest_addr = ais->buf_phy[i];
-		ais->dma_req[i].size = size;
-		tegra_dma_enqueue_req(ais->dma_chan, &ais->dma_req[i]);
-	}
-
-	ais->last_queued = ais->num_bufs - 1;
-
-#if 0
-	i2s_fifo_clear(ads->i2s_base, I2S_FIFO_RX);
-#endif
-	i2s_fifo_set_attention_level(ads->i2s_base,
-			I2S_FIFO_RX, ais->i2s_fifo_atn_level);
-	i2s_fifo_enable(ads->i2s_base, I2S_FIFO_RX, 1);
-	return 0;
-}
-
-static void stop_dma_recording(struct audio_stream *ais)
-{
-	int spin = 0;
-	struct audio_driver_state *ads = ads_from_in(ais);
-	pr_debug("%s\n", __func__);
-	tegra_dma_cancel(ais->dma_chan);
-	i2s_fifo_enable(ads->i2s_base, I2S_FIFO_RX, 0);
-	i2s_fifo_clear(ads->i2s_base, I2S_FIFO_RX);
-	while ((i2s_get_status(ads->i2s_base) & I2S_I2S_FIFO_RX_BUSY) &&
-			spin < 100) {
-		udelay(10);
-		if (spin++ > 50)
-			pr_info("%s: spin %d\n", __func__, spin);
-	}
-	if (spin == 100)
-		pr_warn("%s: spinny\n", __func__);
-}
-
-static irqreturn_t i2s_interrupt(int irq, void *data)
-{
-	struct audio_driver_state *ads = data;
-	u32 status = i2s_get_status(ads->i2s_base);
-
-	pr_debug("%s: %08x\n", __func__, status);
-
-	if (status & I2S_FIFO_ERR)
-		i2s_ack_status(ads->i2s_base);
-
-	pr_debug("%s: done %08x\n", __func__, i2s_get_status(ads->i2s_base));
-	return IRQ_HANDLED;
-}
-
-static ssize_t tegra_audio_write(struct file *file,
-		const char __user *buf, size_t size, loff_t *off)
-{
-	ssize_t rc = 0;
-	int out_buf;
-	struct tegra_dma_req *req;
-	struct audio_driver_state *ads = ads_from_misc_out(file);
-
-	mutex_lock(&ads->out.lock);
-
-	if (!IS_ALIGNED(size, 4) || size < 4 || size > buf_size(&ads->out)) {
-		pr_err("%s: invalid user size %d\n", __func__, size);
-		rc = -EINVAL;
-		goto done;
-	}
-
-	pr_debug("%s: write %d bytes\n", __func__, size);
-
-	if (ads->out.stop) {
-		pr_debug("%s: playback has been cancelled\n", __func__);
-		goto done;
-	}
-
-	/* Decide which buf is next. */
-	out_buf = (ads->out.last_queued + 1) % ads->out.num_bufs;
-	req = &ads->out.dma_req[out_buf];
-
-	/* Wait for the buffer to be emptied (complete).  The maximum timeout
-	 * value could be calculated dynamically based on buf_size(&ads->out).
-	 * For a buffer size of 16k, at 44.1kHz/stereo/16-bit PCM, you would
-	 * have ~93ms.
-	 */
-	pr_debug("%s: waiting for buffer %d\n", __func__, out_buf);
-	rc = wait_for_completion_interruptible_timeout(
-				&ads->out.comp[out_buf], HZ);
-	if (!rc) {
-		pr_err("%s: timeout", __func__);
-		rc = -ETIMEDOUT;
-		goto done;
-	} else if (rc < 0) {
-		pr_err("%s: wait error %d", __func__, rc);
-		goto done;
-	}
-
-	/* Fill the buffer and enqueue it. */
-	pr_debug("%s: acquired buffer %d, copying data\n", __func__, out_buf);
-	rc = copy_from_user(ads->out.buffer[out_buf], buf, size);
-	if (rc) {
-		rc = -EFAULT;
-		goto done;
-	}
-
-	prevent_suspend(&ads->out);
-
-	req->size = size;
-	dma_sync_single_for_device(NULL,
-			req->source_addr, req->size, DMA_TO_DEVICE);
-	ads->out.last_queued = out_buf;
-	init_completion(&ads->out.stop_completion);
-
-	rc = start_playback(&ads->out, req);
-	if (!rc)
-		rc = size;
-	else
-		allow_suspend(&ads->out);
-
-done:
-	mutex_unlock(&ads->out.lock);
-	return rc;
-}
-
-static long tegra_audio_out_ioctl(struct file *file,
-			unsigned int cmd, unsigned long arg)
-{
-	int rc = 0;
-	struct audio_driver_state *ads = ads_from_misc_out_ctl(file);
-	struct audio_stream *aos = &ads->out;
-
-	mutex_lock(&aos->lock);
-
-	switch (cmd) {
-	case TEGRA_AUDIO_OUT_FLUSH:
-		if (pending_buffer_requests(aos)) {
-			pr_debug("%s: flushing\n", __func__);
-			request_stop_nosync(aos);
-			pr_debug("%s: flushed\n", __func__);
-		}
-		if (stop_playback_if_necessary(aos))
-			pr_debug("%s: done (stopped)\n", __func__);
-		aos->stop = false;
-		break;
-	case TEGRA_AUDIO_OUT_SET_NUM_BUFS: {
-		unsigned int num;
-		if (copy_from_user(&num, (const void __user *)arg,
-					sizeof(num))) {
-			rc = -EFAULT;
-			break;
-		}
-		if (!num || num > I2S_MAX_NUM_BUFS) {
-			pr_err("%s: invalid buffer count %d\n", __func__, num);
-			rc = -EINVAL;
-			break;
-		}
-		if (pending_buffer_requests(aos)) {
-			pr_err("%s: playback in progress\n", __func__);
-			rc = -EBUSY;
-			break;
-		}
-		rc = init_stream_buffer(aos, num);
-		if (rc < 0)
-			break;
-		aos->num_bufs = num;
-		sound_ops->tear_down(ads, TEGRA_AUDIO_ENABLE_TX);
-		sound_ops->setup(ads, TEGRA_AUDIO_ENABLE_TX);
-		pr_debug("%s: num buf set to %d\n", __func__, num);
-	}
-		break;
-	case TEGRA_AUDIO_OUT_GET_NUM_BUFS:
-		if (copy_to_user((void __user *)arg,
-				&aos->num_bufs, sizeof(aos->num_bufs)))
-			rc = -EFAULT;
-		break;
-	default:
-		rc = -EINVAL;
-	}
-
-	mutex_unlock(&aos->lock);
-	return rc;
-}
-
-static long tegra_audio_ioctl(struct file *file,
-			unsigned int cmd, unsigned long arg)
-{
-	int rc = 0;
-	struct audio_driver_state *ads = ads_from_misc_ctl(file);
-	unsigned int mode;
-	bool dma_restart = false;
-
-	mutex_lock(&ads->out.lock);
-	mutex_lock(&ads->in.lock);
-
-	switch (cmd) {
-	case TEGRA_AUDIO_SET_BIT_FORMAT:
-		if (copy_from_user(&mode, (const void __user *)arg,
-					sizeof(mode))) {
-			rc = -EFAULT;
-			goto done;
-		}
-		dma_restart = (mode != ads->bit_format);
-		switch (mode) {
-		case TEGRA_AUDIO_BIT_FORMAT_DEFAULT:
-			i2s_set_bit_format(ads->i2s_base, ads->pdata->mode);
-			ads->bit_format = mode;
-			break;
-		case TEGRA_AUDIO_BIT_FORMAT_DSP:
-			i2s_set_bit_format(ads->i2s_base, I2S_BIT_FORMAT_DSP);
-			ads->bit_format = mode;
-			break;
-		default:
-			pr_err("%s: Invald PCM mode %d", __func__, mode);
-			rc = -EINVAL;
-			goto done;
-		}
-		break;
-	case TEGRA_AUDIO_GET_BIT_FORMAT:
-		if (copy_to_user((void __user *)arg, &ads->bit_format,
-				sizeof(mode)))
-			rc = -EFAULT;
-		goto done;
-	}
-
-	if (dma_restart) {
-		pr_debug("%s: Restarting DMA due to configuration change.\n",
-			__func__);
-		if (pending_buffer_requests(&ads->out) || ads->in.active) {
-			pr_err("%s: dma busy, cannot restart.\n", __func__);
-			rc = -EBUSY;
-			goto done;
-		}
-		sound_ops->tear_down(ads, ads->pdata->mask);
-		i2s_configure(ads->pdev);
-		sound_ops->setup(ads, ads->pdata->mask);
-	}
-
-done:
-	mutex_unlock(&ads->in.lock);
-	mutex_unlock(&ads->out.lock);
-	return rc;
-}
-
-static long tegra_audio_in_ioctl(struct file *file,
-			unsigned int cmd, unsigned long arg)
-{
-	int rc = 0;
-	struct audio_driver_state *ads = ads_from_misc_in_ctl(file);
-	struct audio_stream *ais = &ads->in;
-
-	mutex_lock(&ais->lock);
-
-	switch (cmd) {
-	case TEGRA_AUDIO_IN_START:
-		pr_debug("%s: start recording\n", __func__);
-		ais->stop = false;
-		break;
-	case TEGRA_AUDIO_IN_STOP:
-		pr_debug("%s: stop recording\n", __func__);
-		if (ais->active) {
-			/* Clean up DMA/I2S, and complete the completion */
-			sound_ops->stop_recording(ais);
-			complete(&ais->stop_completion);
-			/* Set stop flag and allow suspend. */
-			request_stop_nosync(ais);
-		}
-		break;
-	case TEGRA_AUDIO_IN_SET_CONFIG: {
-		struct tegra_audio_in_config cfg;
-
-		if (ais->active) {
-			pr_err("%s: recording in progress\n", __func__);
-			rc = -EBUSY;
-			break;
-		}
-		if (copy_from_user(&cfg, (const void __user *)arg,
-					sizeof(cfg))) {
-			rc = -EFAULT;
-			break;
-		}
-
-		if (cfg.stereo && !ads->pdata->stereo_capture) {
-			pr_err("%s: not capable of stereo capture.",
-				__func__);
-			rc = -EINVAL;
-		}
-		if (!rc) {
-			pr_info("%s: setting input sampling rate to %d, %s\n",
-				__func__, cfg.rate,
-				cfg.stereo ? "stereo" : "mono");
-			ads->in_config = cfg;
-			ads->in_config.stereo = !!ads->in_config.stereo;
-		}
-	}
-		break;
-	case TEGRA_AUDIO_IN_GET_CONFIG:
-		if (copy_to_user((void __user *)arg, &ads->in_config,
-				sizeof(ads->in_config)))
-			rc = -EFAULT;
-		break;
-	case TEGRA_AUDIO_IN_SET_NUM_BUFS: {
-		unsigned int num;
-		if (copy_from_user(&num, (const void __user *)arg,
-					sizeof(num))) {
-			rc = -EFAULT;
-			break;
-		}
-		if (!num || num > I2S_MAX_NUM_BUFS) {
-			pr_err("%s: invalid buffer count %d\n", __func__,
-				num);
-			rc = -EINVAL;
-			break;
-		}
-		if (ais->active || pending_buffer_requests(ais)) {
-			pr_err("%s: recording in progress\n", __func__);
-			rc = -EBUSY;
-			break;
-		}
-		rc = init_stream_buffer(ais, num);
-		if (rc < 0)
-			break;
-		ais->num_bufs = num;
-		sound_ops->tear_down(ads, TEGRA_AUDIO_ENABLE_RX);
-		sound_ops->setup(ads, TEGRA_AUDIO_ENABLE_RX);
-	}
-		break;
-	case TEGRA_AUDIO_IN_GET_NUM_BUFS:
-		if (copy_to_user((void __user *)arg,
-				&ais->num_bufs, sizeof(ais->num_bufs)))
-			rc = -EFAULT;
-		break;
-	default:
-		rc = -EINVAL;
-	}
-
-	mutex_unlock(&ais->lock);
-	return rc;
-}
-
-static ssize_t tegra_audio_read(struct file *file, char __user *buf,
-			size_t size, loff_t *off)
-{
-	ssize_t rc;
-	ssize_t nr = 0;
-	int in_buf;
-	struct tegra_dma_req *req;
-	struct audio_driver_state *ads = ads_from_misc_in(file);
-
-	mutex_lock(&ads->in.lock);
-
-	if (!IS_ALIGNED(size, 4) || size < 4 || size > buf_size(&ads->in)) {
-		pr_err("%s: invalid size %d.\n", __func__, size);
-		rc = -EINVAL;
-		goto done;
-	}
-
-	pr_debug("%s: size %d\n", __func__, size);
-
-	/* If we want recording to stop immediately after it gets cancelled,
-	 * then we do not want to wait for the fifo to get drained.
-	 */
-	if (ads->in.stop) {
-		pr_debug("%s: recording has been cancelled\n", __func__);
-		rc = 0;
-		goto done;
-	}
-
-	/* This function calls prevent_suspend() internally */
-	rc = start_recording_if_necessary(&ads->in, size);
-	if (rc < 0 && rc != -EALREADY) {
-		pr_err("%s: could not start recording\n", __func__);
-		goto done;
-	}
-
-	ads->in.active = true;
-
-	/* Note that when tegra_audio_read() is called for the first time (or
-	 * when all the buffers are empty), then it queues up all
-	 * ads->in.num_bufs buffers, and in_buf is set to zero below.
-	 */
-	in_buf = (ads->in.last_queued + 1) % ads->in.num_bufs;
-
-	/* Wait for the buffer to be filled (complete).  The maximum timeout
-	 * value could be calculated dynamically based on buf_size(&ads->in).
-	 * For a buffer size of 16k, at 44.1kHz/stereo/16-bit PCM, you would
-	 * have ~93ms.
-	 */
-	rc = wait_for_completion_interruptible_timeout(
-				&ads->in.comp[in_buf], HZ);
-	if (!rc) {
-		pr_err("%s: timeout", __func__);
-		rc = -ETIMEDOUT;
-		goto done;
-	} else if (rc < 0) {
-		pr_err("%s: wait error %d", __func__, rc);
-		goto done;
-	}
-
-	req = &ads->in.dma_req[in_buf];
-
-	nr = size > req->size ? req->size : size;
-	req->size = size;
-	dma_sync_single_for_cpu(NULL, ads->in.dma_req[in_buf].dest_addr,
-				ads->in.dma_req[in_buf].size, DMA_FROM_DEVICE);
-	rc = copy_to_user(buf, ads->in.buffer[in_buf], nr);
-	if (rc) {
-		rc = -EFAULT;
-		goto done;
-	}
-
-	init_completion(&ads->in.stop_completion);
-
-	ads->in.last_queued = in_buf;
-	rc = tegra_dma_enqueue_req(ads->in.dma_chan, req);
-	/* We've successfully enqueued this request before. */
-	BUG_ON(rc);
-
-	rc = nr;
-	*off += nr;
-done:
-	mutex_unlock(&ads->in.lock);
-	pr_debug("%s: done %d\n", __func__, rc);
-	return rc;
-}
-
-static int tegra_audio_out_open(struct inode *inode, struct file *file)
-{
-	int rc = 0;
-	int i;
-	struct audio_driver_state *ads = ads_from_misc_out(file);
-
-	pr_debug("%s\n", __func__);
-
-	mutex_lock(&ads->out.lock);
-
-	if (ads->out.opened) {
-		rc = -EBUSY;
-		goto done;
-	}
-
-	ads->out.opened = 1;
-	ads->out.stop = false;
-
-	for (i = 0; i < I2S_MAX_NUM_BUFS; i++) {
-		init_completion(&ads->out.comp[i]);
-		/* TX buf rest state is unqueued, complete. */
-		complete(&ads->out.comp[i]);
-	}
-
-done:
-	mutex_unlock(&ads->out.lock);
-	return rc;
-}
-
-static int tegra_audio_out_release(struct inode *inode, struct file *file)
-{
-	struct audio_driver_state *ads = ads_from_misc_out(file);
-
-	pr_debug("%s\n", __func__);
-
-	mutex_lock(&ads->out.lock);
-	ads->out.opened = 0;
-	request_stop_nosync(&ads->out);
-	if (stop_playback_if_necessary(&ads->out))
-		pr_debug("%s: done (stopped)\n", __func__);
-	allow_suspend(&ads->out);
-	mutex_unlock(&ads->out.lock);
-	pr_debug("%s: done\n", __func__);
-	return 0;
-}
-
-static int tegra_audio_in_open(struct inode *inode, struct file *file)
-{
-	int rc = 0;
-	int i;
-	struct audio_driver_state *ads = ads_from_misc_in(file);
-
-	pr_debug("%s\n", __func__);
-
-	mutex_lock(&ads->in.lock);
-	if (ads->in.opened) {
-		rc = -EBUSY;
-		goto done;
-	}
-
-	ads->in.opened = 1;
-	ads->in.stop = false;
-
-	for (i = 0; i < I2S_MAX_NUM_BUFS; i++) {
-		init_completion(&ads->in.comp[i]);
-		/* RX buf rest state is unqueued, complete. */
-		complete(&ads->in.comp[i]);
-	}
-
-done:
-	mutex_unlock(&ads->in.lock);
-	return rc;
-}
-
-static int tegra_audio_in_release(struct inode *inode, struct file *file)
-{
-	struct audio_driver_state *ads = ads_from_misc_in(file);
-
-	pr_debug("%s\n", __func__);
-
-	mutex_lock(&ads->in.lock);
-	ads->in.opened = 0;
-	if (ads->in.active) {
-		sound_ops->stop_recording(&ads->in);
-		complete(&ads->in.stop_completion);
-		request_stop_nosync(&ads->in);
-	}
-	allow_suspend(&ads->in);
-	mutex_unlock(&ads->in.lock);
-	pr_debug("%s: done\n", __func__);
-	return 0;
-}
-
-static const struct file_operations tegra_audio_out_fops = {
-	.owner = THIS_MODULE,
-	.open = tegra_audio_out_open,
-	.release = tegra_audio_out_release,
-	.write = tegra_audio_write,
-};
-
-static const struct file_operations tegra_audio_in_fops = {
-	.owner = THIS_MODULE,
-	.open = tegra_audio_in_open,
-	.read = tegra_audio_read,
-	.release = tegra_audio_in_release,
-};
-
-static int tegra_audio_ctl_open(struct inode *inode, struct file *file)
-{
-	return 0;
-}
-
-static int tegra_audio_ctl_release(struct inode *inode, struct file *file)
-{
-	return 0;
-}
-
-static const struct file_operations tegra_audio_out_ctl_fops = {
-	.owner = THIS_MODULE,
-	.open = tegra_audio_ctl_open,
-	.release = tegra_audio_ctl_release,
-	.unlocked_ioctl = tegra_audio_out_ioctl,
-};
-
-static const struct file_operations tegra_audio_in_ctl_fops = {
-	.owner = THIS_MODULE,
-	.open = tegra_audio_ctl_open,
-	.release = tegra_audio_ctl_release,
-	.unlocked_ioctl = tegra_audio_in_ioctl,
-};
-
-static const struct file_operations tegra_audio_ctl_fops = {
-	.owner = THIS_MODULE,
-	.open = tegra_audio_ctl_open,
-	.release = tegra_audio_ctl_release,
-	.unlocked_ioctl = tegra_audio_ioctl,
-};
-
-static int init_stream_buffer(struct audio_stream *s, int num)
-{
-	int i, j;
-	pr_debug("%s (num %d)\n", __func__,  num);
-
-	for (i = 0; i < num; i++) {
-		kfree(s->buffer[i]);
-		s->buffer[i] =
-			kmalloc((1 << PCM_BUFFER_MAX_SIZE_ORDER),
-					GFP_KERNEL | GFP_DMA);
-		if (!s->buffer[i]) {
-			pr_err("%s: could not allocate buffer\n", __func__);
-			for (j = i - 1; j >= 0; j--) {
-				kfree(s->buffer[j]);
-				s->buffer[j] = 0;
-			}
-			return -ENOMEM;
-		}
-	}
-	return 0;
-}
-
-
-static int setup_misc_device(struct miscdevice *misc,
-			const struct file_operations  *fops,
-			const char *fmt, ...)
-{
-	int rc = 0;
-	va_list args;
-	const int sz = 64;
-
-	va_start(args, fmt);
-
-	memset(misc, 0, sizeof(*misc));
-	misc->minor = MISC_DYNAMIC_MINOR;
-	misc->name  = kmalloc(sz, GFP_KERNEL);
-	if (!misc->name) {
-		rc = -ENOMEM;
-		goto done;
-	}
-
-	vsnprintf((char *)misc->name, sz, fmt, args);
-	misc->fops = fops;
-	if (misc_register(misc)) {
-		pr_err("%s: could not register %s\n", __func__, misc->name);
-		kfree(misc->name);
-		rc = -EIO;
-		goto done;
-	}
-
-done:
-	va_end(args);
-	return rc;
-}
-
-static ssize_t dma_toggle_show(struct device *dev,
-				struct device_attribute *attr,
-				char *buf)
-{
-	return sprintf(buf, "dma\n");
-}
-
-static ssize_t dma_toggle_store(struct device *dev,
-			struct device_attribute *attr,
-			const char *buf, size_t count)
-{
-	pr_err("%s: Not implemented.", __func__);
-	return 0;
-}
-
-static DEVICE_ATTR(dma_toggle, 0644, dma_toggle_show, dma_toggle_store);
-
-static ssize_t __attr_fifo_atn_read(char *buf, int atn_lvl)
-{
-	switch (atn_lvl) {
-	case I2S_FIFO_ATN_LVL_ONE_SLOT:
-		strncpy(buf, "1\n", 2);
-		return 2;
-	case I2S_FIFO_ATN_LVL_FOUR_SLOTS:
-		strncpy(buf, "4\n", 2);
-		return 2;
-	case I2S_FIFO_ATN_LVL_EIGHT_SLOTS:
-		strncpy(buf, "8\n", 2);
-		return 2;
-	case I2S_FIFO_ATN_LVL_TWELVE_SLOTS:
-		strncpy(buf, "12\n", 3);
-		return 3;
-	default:
-		BUG_ON(1);
-		return -EIO;
-	}
-}
-
-static ssize_t __attr_fifo_atn_write(struct audio_driver_state *ads,
-		struct audio_stream *as,
-		int *fifo_lvl,
-		const char *buf, size_t size)
-{
-	int lvl;
-
-	if (size > 3) {
-		pr_err("%s: buffer size %d too big\n", __func__, size);
-		return -EINVAL;
-	}
-
-	if (sscanf(buf, "%d", &lvl) != 1) {
-		pr_err("%s: invalid input string [%s]\n", __func__, buf);
-		return -EINVAL;
-	}
-
-	switch (lvl) {
-	case 1:
-		lvl = I2S_FIFO_ATN_LVL_ONE_SLOT;
-		break;
-	case 4:
-		lvl = I2S_FIFO_ATN_LVL_FOUR_SLOTS;
-		break;
-	case 8:
-		lvl = I2S_FIFO_ATN_LVL_EIGHT_SLOTS;
-		break;
-	case 12:
-		lvl = I2S_FIFO_ATN_LVL_TWELVE_SLOTS;
-		break;
-	default:
-		pr_err("%s: invalid attention level %d\n", __func__, lvl);
-		return -EINVAL;
-	}
-
-	*fifo_lvl = lvl;
-	pr_info("%s: fifo level %d\n", __func__, *fifo_lvl);
-
-	return size;
-}
-
-static ssize_t tx_fifo_atn_show(struct device *dev,
-				struct device_attribute *attr,
-				char *buf)
-{
-	struct tegra_audio_platform_data *pdata = dev->platform_data;
-	struct audio_driver_state *ads = pdata->driver_data;
-	return __attr_fifo_atn_read(buf, ads->out.i2s_fifo_atn_level);
-}
-
-static ssize_t tx_fifo_atn_store(struct device *dev,
-			struct device_attribute *attr,
-			const char *buf, size_t count)
-{
-	ssize_t rc;
-	struct tegra_audio_platform_data *pdata = dev->platform_data;
-	struct audio_driver_state *ads = pdata->driver_data;
-	mutex_lock(&ads->out.lock);
-	if (pending_buffer_requests(&ads->out)) {
-		pr_err("%s: playback in progress.\n", __func__);
-		rc = -EBUSY;
-		goto done;
-	}
-	rc = __attr_fifo_atn_write(ads, &ads->out,
-			&ads->out.i2s_fifo_atn_level,
-			buf, count);
-done:
-	mutex_unlock(&ads->out.lock);
-	return rc;
-}
-
-static DEVICE_ATTR(tx_fifo_atn, 0644, tx_fifo_atn_show, tx_fifo_atn_store);
-
-static ssize_t rx_fifo_atn_show(struct device *dev,
-				struct device_attribute *attr,
-				char *buf)
-{
-	struct tegra_audio_platform_data *pdata = dev->platform_data;
-	struct audio_driver_state *ads = pdata->driver_data;
-	return __attr_fifo_atn_read(buf, ads->in.i2s_fifo_atn_level);
-}
-
-static ssize_t rx_fifo_atn_store(struct device *dev,
-			struct device_attribute *attr,
-			const char *buf, size_t count)
-{
-	ssize_t rc;
-	struct tegra_audio_platform_data *pdata = dev->platform_data;
-	struct audio_driver_state *ads = pdata->driver_data;
-	mutex_lock(&ads->in.lock);
-	if (ads->in.active) {
-		pr_err("%s: recording in progress.\n", __func__);
-		rc = -EBUSY;
-		goto done;
-	}
-	rc = __attr_fifo_atn_write(ads, &ads->in,
-			&ads->in.i2s_fifo_atn_level,
-			buf, count);
-done:
-	mutex_unlock(&ads->in.lock);
-	return rc;
-}
-
-static DEVICE_ATTR(rx_fifo_atn, 0644, rx_fifo_atn_show, rx_fifo_atn_store);
-
-static int tegra_audio_probe(struct platform_device *pdev)
-{
-	int rc, i;
-	struct resource *res;
-	struct clk *i2s_clk, *dap_mclk;
-	struct audio_driver_state *state;
-
-	pr_info("%s\n", __func__);
-
-	state = kzalloc(sizeof(*state), GFP_KERNEL);
-	if (!state)
-		return -ENOMEM;
-
-	state->pdev = pdev;
-	state->pdata = pdev->dev.platform_data;
-	state->pdata->driver_data = state;
-	BUG_ON(!state->pdata);
-
-	if (!(state->pdata->mask &
-			(TEGRA_AUDIO_ENABLE_TX | TEGRA_AUDIO_ENABLE_RX))) {
-		dev_err(&pdev->dev, "neither tx nor rx is enabled!\n");
-		return -EIO;
-	}
-
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res) {
-		dev_err(&pdev->dev, "no mem resource!\n");
-		return -ENODEV;
-	}
-
-	if (!request_mem_region(res->start, resource_size(res), pdev->name)) {
-		dev_err(&pdev->dev, "memory region already claimed!\n");
-		return -ENOMEM;
-	}
-
-	state->i2s_phys = res->start;
-	state->i2s_base = (unsigned long)ioremap(res->start,
-			res->end - res->start + 1);
-	if (!state->i2s_base) {
-		dev_err(&pdev->dev, "cannot remap iomem!\n");
-		return -EIO;
-	}
-
-	res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
-	if (!res) {
-		dev_err(&pdev->dev, "no dma resource!\n");
-		return -ENODEV;
-	}
-	state->dma_req_sel = res->start;
-
-	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
-	if (!res) {
-		dev_err(&pdev->dev, "no irq resource!\n");
-		return -ENODEV;
-	}
-	state->irq = res->start;
-
-	i2s_clk = clk_get(&pdev->dev, NULL);
-	if (!i2s_clk) {
-		dev_err(&pdev->dev, "%s: could not get i2s clock\n",
-			__func__);
-		return -EIO;
-	}
-
-	clk_set_rate(i2s_clk, state->pdata->i2s_clk_rate);
-	if (clk_enable(i2s_clk)) {
-		dev_err(&pdev->dev, "%s: failed to enable i2s clock\n",
-			__func__);
-		return -EIO;
-	}
-	pr_info("%s: i2s_clk rate %ld\n", __func__, clk_get_rate(i2s_clk));
-
-	dap_mclk = tegra_get_clock_by_name(state->pdata->dap_clk);
-	if (!dap_mclk) {
-		dev_err(&pdev->dev, "%s: could not get DAP clock\n",
-			__func__);
-		return -EIO;
-	}
-	clk_enable(dap_mclk);
-
-	rc = i2s_configure(pdev);
-	if (rc < 0)
-		return rc;
-
-	if ((state->pdata->mask & TEGRA_AUDIO_ENABLE_TX)) {
-		state->out.opened = 0;
-		state->out.active = false;
-		mutex_init(&state->out.lock);
-		init_completion(&state->out.stop_completion);
-		spin_lock_init(&state->out.dma_req_lock);
-		state->out.dma_chan = NULL;
-		state->out.i2s_fifo_atn_level = I2S_FIFO_ATN_LVL_FOUR_SLOTS;
-		state->out.num_bufs = I2S_DEFAULT_TX_NUM_BUFS;
-		for (i = 0; i < I2S_MAX_NUM_BUFS; i++) {
-			init_completion(&state->out.comp[i]);
-			/* TX buf rest state is unqueued, complete. */
-			complete(&state->out.comp[i]);
-			state->out.buffer[i] = 0;
-			state->out.buf_phy[i] = 0;
-		}
-		state->out.last_queued = 0;
-		rc = init_stream_buffer(&state->out, state->out.num_bufs);
-		if (rc < 0)
-			return rc;
-
-		INIT_WORK(&state->out.allow_suspend_work, allow_suspend_worker);
-
-		snprintf(state->out.wake_lock_name,
-			sizeof(state->out.wake_lock_name),
-			"i2s.%d-audio-out", state->pdev->id);
-		wake_lock_init(&state->out.wake_lock, WAKE_LOCK_SUSPEND,
-			state->out.wake_lock_name);
-
-		rc = setup_misc_device(&state->misc_out,
-			&tegra_audio_out_fops,
-			"audio%d_out", state->pdev->id);
-		if (rc < 0)
-			return rc;
-
-		rc = setup_misc_device(&state->misc_out_ctl,
-				&tegra_audio_out_ctl_fops,
-				"audio%d_out_ctl", state->pdev->id);
-		if (rc < 0)
-			return rc;
-	}
-
-	if ((state->pdata->mask & TEGRA_AUDIO_ENABLE_RX)) {
-		state->in.opened = 0;
-		state->in.active = false;
-		mutex_init(&state->in.lock);
-		init_completion(&state->in.stop_completion);
-		spin_lock_init(&state->in.dma_req_lock);
-		state->in.dma_chan = NULL;
-		state->in.i2s_fifo_atn_level = I2S_FIFO_ATN_LVL_FOUR_SLOTS;
-		state->in.num_bufs = I2S_DEFAULT_RX_NUM_BUFS;
-		for (i = 0; i < I2S_MAX_NUM_BUFS; i++) {
-			init_completion(&state->in.comp[i]);
-			/* RX buf rest state is unqueued, complete. */
-			complete(&state->in.comp[i]);
-			state->in.buffer[i] = 0;
-			state->in.buf_phy[i] = 0;
-		}
-		state->in.last_queued = 0;
-		rc = init_stream_buffer(&state->in, state->in.num_bufs);
-		if (rc < 0)
-			return rc;
-
-		INIT_WORK(&state->in.allow_suspend_work, allow_suspend_worker);
-
-		snprintf(state->in.wake_lock_name,
-			sizeof(state->in.wake_lock_name),
-			"i2s.%d-audio-in", state->pdev->id);
-		wake_lock_init(&state->in.wake_lock, WAKE_LOCK_SUSPEND,
-			state->in.wake_lock_name);
-
-		rc = setup_misc_device(&state->misc_in,
-			&tegra_audio_in_fops,
-			"audio%d_in", state->pdev->id);
-		if (rc < 0)
-			return rc;
-
-		rc = setup_misc_device(&state->misc_in_ctl,
-			&tegra_audio_in_ctl_fops,
-			"audio%d_in_ctl", state->pdev->id);
-		if (rc < 0)
-			return rc;
-	}
-
-	if (request_irq(state->irq, i2s_interrupt,
-			IRQF_DISABLED, state->pdev->name, state) < 0) {
-		dev_err(&pdev->dev,
-			"%s: could not register handler for irq %d\n",
-			__func__, state->irq);
-		return -EIO;
-	}
-
-	rc = setup_misc_device(&state->misc_ctl,
-			&tegra_audio_ctl_fops,
-			"audio%d_ctl", state->pdev->id);
-	if (rc < 0)
-		return rc;
-
-	sound_ops->setup(state, state->pdata->mask);
-
-	rc = device_create_file(&pdev->dev, &dev_attr_dma_toggle);
-	if (rc < 0) {
-		dev_err(&pdev->dev, "%s: could not create sysfs entry %s: %d\n",
-			__func__, dev_attr_dma_toggle.attr.name, rc);
-		return rc;
-	}
-
-	rc = device_create_file(&pdev->dev, &dev_attr_tx_fifo_atn);
-	if (rc < 0) {
-		dev_err(&pdev->dev, "%s: could not create sysfs entry %s: %d\n",
-			__func__, dev_attr_tx_fifo_atn.attr.name, rc);
-		return rc;
-	}
-
-	rc = device_create_file(&pdev->dev, &dev_attr_rx_fifo_atn);
-	if (rc < 0) {
-		dev_err(&pdev->dev, "%s: could not create sysfs entry %s: %d\n",
-			__func__, dev_attr_rx_fifo_atn.attr.name, rc);
-		return rc;
-	}
-
-	state->in_config.rate = 11025;
-	state->in_config.stereo = false;
-
-	return 0;
-}
-
-#ifdef CONFIG_PM_SLEEP
-static int tegra_audio_suspend(struct platform_device *pdev, pm_message_t mesg)
-{
-	/* dev_info(&pdev->dev, "%s\n", __func__); */
-	return 0;
-}
-
-static int tegra_audio_resume(struct platform_device *pdev)
-{
-	return i2s_configure(pdev);
-}
-#endif /* CONFIG_PM_SLEEP */
-
-static struct platform_driver tegra_audio_driver = {
-	.driver = {
-		.name = "tegra-i2s",
-		.owner = THIS_MODULE,
-	},
-	.probe = tegra_audio_probe,
-#ifdef CONFIG_PM_SLEEP
-	.suspend = tegra_audio_suspend,
-	.resume = tegra_audio_resume,
-#endif
-};
-
-static int __init tegra_audio_init(void)
-{
-	return platform_driver_register(&tegra_audio_driver);
-}
-
-module_init(tegra_audio_init);
-MODULE_LICENSE("GPL");
diff --git a/arch/arm/mach-tegra/tegra_spdif_audio.c b/arch/arm/mach-tegra/tegra_spdif_audio.c
deleted file mode 100644
index 3765633606cd..000000000000
--- a/arch/arm/mach-tegra/tegra_spdif_audio.c
+++ /dev/null
@@ -1,1187 +0,0 @@
-/*
- * arch/arm/mach-tegra/tegra_spdif_audio.c
- *
- * S/PDIF audio driver for NVIDIA Tegra SoCs
- *
- * Copyright (c) 2008-2009, NVIDIA Corporation.
- *
- * 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.
- *
- * 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.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
- */
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/miscdevice.h>
-#include <linux/fs.h>
-#include <linux/mutex.h>
-#include <linux/clk.h>
-#include <linux/interrupt.h>
-#include <linux/slab.h>
-#include <linux/list.h>
-#include <linux/spinlock.h>
-#include <linux/uaccess.h>
-#include <linux/dma-mapping.h>
-#include <linux/dmapool.h>
-#include <linux/err.h>
-#include <linux/spi/spi.h>
-#include <linux/kfifo.h>
-#include <linux/debugfs.h>
-#include <linux/completion.h>
-#include <linux/platform_device.h>
-#include <linux/device.h>
-#include <linux/io.h>
-#include <linux/ktime.h>
-#include <linux/sysfs.h>
-#include <linux/wakelock.h>
-#include <linux/delay.h>
-#include <linux/tegra_audio.h>
-#include <linux/pm.h>
-#include <linux/workqueue.h>
-
-#include <mach/dma.h>
-#include <mach/iomap.h>
-#include <mach/spdif.h>
-#include <mach/audio.h>
-#include <mach/irqs.h>
-
-#include "clock.h"
-
-#define PCM_BUFFER_MAX_SIZE_ORDER	(PAGE_SHIFT)
-
-#define SPDIF_MAX_NUM_BUFS 4
-/* Todo: Add IOCTL to configure the number of buffers. */
-#define SPDIF_DEFAULT_TX_NUM_BUFS 2
-#define SPDIF_DEFAULT_RX_NUM_BUFS 2
-/* per stream (input/output) */
-struct audio_stream {
-	int opened;
-	struct mutex lock;
-
-	bool active; /* is DMA in progress? */
-	int num_bufs;
-	void *buffer[SPDIF_MAX_NUM_BUFS];
-	dma_addr_t buf_phy[SPDIF_MAX_NUM_BUFS];
-	struct completion comp[SPDIF_MAX_NUM_BUFS];
-	struct tegra_dma_req dma_req[SPDIF_MAX_NUM_BUFS];
-	int last_queued;
-
-	int spdif_fifo_atn_level;
-
-	struct tegra_dma_channel *dma_chan;
-	bool stop;
-	struct completion stop_completion;
-	spinlock_t dma_req_lock;
-
-	struct work_struct allow_suspend_work;
-	struct wake_lock wake_lock;
-	char wake_lock_name[100];
-};
-
-struct audio_driver_state {
-	struct list_head next;
-
-	struct platform_device *pdev;
-	struct tegra_audio_platform_data *pdata;
-	phys_addr_t spdif_phys;
-	unsigned long spdif_base;
-
-	unsigned long dma_req_sel;
-	bool fifo_init;
-
-	int irq;
-
-	struct miscdevice misc_out;
-	struct miscdevice misc_out_ctl;
-	struct audio_stream out;
-};
-
-static inline bool pending_buffer_requests(struct audio_stream *stream)
-{
-	int i;
-	for (i = 0; i < stream->num_bufs; i++)
-		if (!completion_done(&stream->comp[i]))
-			return true;
-	return false;
-}
-
-static inline int buf_size(struct audio_stream *s __attribute__((unused)))
-{
-	return 1 << PCM_BUFFER_MAX_SIZE_ORDER;
-}
-
-static inline struct audio_driver_state *ads_from_misc_out(struct file *file)
-{
-	struct miscdevice *m = file->private_data;
-	struct audio_driver_state *ads =
-			container_of(m, struct audio_driver_state, misc_out);
-	BUG_ON(!ads);
-	return ads;
-}
-
-static inline struct audio_driver_state *ads_from_misc_out_ctl(
-		struct file *file)
-{
-	struct miscdevice *m = file->private_data;
-	struct audio_driver_state *ads =
-			container_of(m, struct audio_driver_state,
-					misc_out_ctl);
-	BUG_ON(!ads);
-	return ads;
-}
-
-static inline struct audio_driver_state *ads_from_out(
-			struct audio_stream *aos)
-{
-	return container_of(aos, struct audio_driver_state, out);
-}
-
-static inline void prevent_suspend(struct audio_stream *as)
-{
-	pr_debug("%s\n", __func__);
-	cancel_work_sync(&as->allow_suspend_work);
-	wake_lock(&as->wake_lock);
-}
-
-static void allow_suspend_worker(struct work_struct *w)
-{
-	struct audio_stream *as = container_of(w,
-			struct audio_stream, allow_suspend_work);
-	pr_debug("%s\n", __func__);
-	wake_unlock(&as->wake_lock);
-}
-
-static inline void allow_suspend(struct audio_stream *as)
-{
-	schedule_work(&as->allow_suspend_work);
-}
-
-#define I2S_I2S_FIFO_TX_BUSY	I2S_I2S_STATUS_FIFO1_BSY
-#define I2S_I2S_FIFO_TX_QS	I2S_I2S_STATUS_QS_FIFO1
-#define I2S_I2S_FIFO_TX_ERR	I2S_I2S_STATUS_FIFO1_ERR
-
-#define I2S_I2S_FIFO_RX_BUSY	I2S_I2S_STATUS_FIFO2_BSY
-#define I2S_I2S_FIFO_RX_QS	I2S_I2S_STATUS_QS_FIFO2
-#define I2S_I2S_FIFO_RX_ERR	I2S_I2S_STATUS_FIFO2_ERR
-
-#define I2S_FIFO_ERR (I2S_I2S_STATUS_FIFO1_ERR | I2S_I2S_STATUS_FIFO2_ERR)
-
-
-static inline void spdif_writel(unsigned long base, u32 val, u32 reg)
-{
-	writel(val, base + reg);
-}
-
-static inline u32 spdif_readl(unsigned long base, u32 reg)
-{
-	return readl(base + reg);
-}
-
-static inline void spdif_fifo_write(unsigned long base, u32 data)
-{
-	spdif_writel(base, data, SPDIF_DATA_OUT_0);
-}
-
-static int spdif_fifo_set_attention_level(unsigned long base,
-			unsigned level)
-{
-	u32 val;
-
-	if (level > SPDIF_FIFO_ATN_LVL_TWELVE_SLOTS) {
-		pr_err("%s: invalid fifo level selector %d\n", __func__,
-			level);
-		return -EINVAL;
-	}
-
-	val = spdif_readl(base, SPDIF_DATA_FIFO_CSR_0);
-
-	val &= ~SPDIF_DATA_FIFO_CSR_0_TX_ATN_LVL_MASK;
-	val |= level << SPDIF_DATA_FIFO_CSR_0_TX_ATN_LVL_SHIFT;
-
-
-	spdif_writel(base, val, SPDIF_DATA_FIFO_CSR_0);
-	return 0;
-}
-
-static void spdif_fifo_enable(unsigned long base, int on)
-{
-	u32 val = spdif_readl(base, SPDIF_CTRL_0);
-	val &= ~(SPDIF_CTRL_0_TX_EN | SPDIF_CTRL_0_TC_EN | SPDIF_CTRL_0_TU_EN);
-	val |= on ? (SPDIF_CTRL_0_TX_EN) : 0;
-	val |= on ? (SPDIF_CTRL_0_TC_EN) : 0;
-
-	spdif_writel(base, val, SPDIF_CTRL_0);
-}
-#if 0
-static bool spdif_is_fifo_enabled(unsigned long base)
-{
-	u32 val = spdif_readl(base, SPDIF_CTRL_0);
-	return !!(val & SPDIF_CTRL_0_TX_EN);
-}
-#endif
-
-static void spdif_fifo_clear(unsigned long base)
-{
-	u32 val = spdif_readl(base, SPDIF_DATA_FIFO_CSR_0);
-	val &= ~(SPDIF_DATA_FIFO_CSR_0_TX_CLR | SPDIF_DATA_FIFO_CSR_0_TU_CLR);
-	val |= SPDIF_DATA_FIFO_CSR_0_TX_CLR | SPDIF_DATA_FIFO_CSR_0_TU_CLR;
-	spdif_writel(base, val, SPDIF_DATA_FIFO_CSR_0);
-}
-
-
-static int spdif_set_bit_mode(unsigned long base, unsigned mode)
-{
-	u32 val = spdif_readl(base, SPDIF_CTRL_0);
-	val &= ~SPDIF_CTRL_0_BIT_MODE_MASK;
-
-	if (mode > SPDIF_BIT_MODE_MODERAW) {
-		pr_err("%s: invalid bit_size selector %d\n", __func__,
-			mode);
-		return -EINVAL;
-	}
-
-	val |= mode << SPDIF_CTRL_0_BIT_MODE_SHIFT;
-
-	spdif_writel(base, val, SPDIF_CTRL_0);
-	return 0;
-}
-
-static int spdif_set_fifo_packed(unsigned long base, unsigned on)
-{
-	u32 val = spdif_readl(base, SPDIF_CTRL_0);
-	val &= ~SPDIF_CTRL_0_PACK;
-	val |= on ? SPDIF_CTRL_0_PACK : 0;
-	spdif_writel(base, val, SPDIF_CTRL_0);
-	return 0;
-}
-
-#if 0
-static void spdif_set_fifo_irq_on_err(unsigned long base, int on)
-{
-	u32 val = spdif_readl(base, SPDIF_CTRL_0);
-	val &= ~SPDIF_CTRL_0_IE_TXE;
-	val |= on ? SPDIF_CTRL_0_IE_TXE : 0;
-	spdif_writel(base, val, SPDIF_CTRL_0);
-}
-#endif
-
-
-static void spdif_enable_fifos(unsigned long base, int on)
-{
-	u32 val = spdif_readl(base, SPDIF_CTRL_0);
-	if (on)
-		val |= SPDIF_CTRL_0_TX_EN | SPDIF_CTRL_0_TC_EN |
-		       SPDIF_CTRL_0_IE_TXE;
-	else
-		val &= ~(SPDIF_CTRL_0_TX_EN | SPDIF_CTRL_0_TC_EN |
-			 SPDIF_CTRL_0_IE_TXE);
-
-	spdif_writel(base, val, SPDIF_CTRL_0);
-}
-
-static inline u32 spdif_get_status(unsigned long base)
-{
-	return spdif_readl(base, SPDIF_STATUS_0);
-}
-
-static inline u32 spdif_get_control(unsigned long base)
-{
-	return spdif_readl(base, SPDIF_CTRL_0);
-}
-
-static inline void spdif_ack_status(unsigned long base)
-{
-	return spdif_writel(base, spdif_readl(base, SPDIF_STATUS_0),
-				SPDIF_STATUS_0);
-}
-
-static inline u32 spdif_get_fifo_scr(unsigned long base)
-{
-	return spdif_readl(base, SPDIF_DATA_FIFO_CSR_0);
-}
-
-static inline phys_addr_t spdif_get_fifo_phy_base(unsigned long phy_base)
-{
-	return phy_base + SPDIF_DATA_OUT_0;
-}
-
-static inline u32 spdif_get_fifo_full_empty_count(unsigned long base)
-{
-	u32 val = spdif_readl(base, SPDIF_DATA_FIFO_CSR_0);
-	val = val >> SPDIF_DATA_FIFO_CSR_0_TD_EMPTY_COUNT_SHIFT;
-	return val & SPDIF_DATA_FIFO_CSR_0_TD_EMPTY_COUNT_MASK;
-}
-
-
-static int spdif_set_sample_rate(struct audio_driver_state *state,
-				unsigned int sample_rate)
-{
-	unsigned int clock_freq = 0;
-	struct clk *spdif_clk;
-
-	unsigned int ch_sta[] = {
-		0x0, /* 44.1, default values */
-		0x0,
-		0x0,
-		0x0,
-		0x0,
-		0x0,
-	};
-
-	switch (sample_rate) {
-	case 32000:
-		clock_freq = 4096000; /* 4.0960 MHz */
-		ch_sta[0] = 0x3 << 24;
-		ch_sta[1] = 0xC << 4;
-		break;
-	case 44100:
-		clock_freq = 5644800; /* 5.6448 MHz */
-		ch_sta[0] = 0x0;
-		ch_sta[1] = 0xF << 4;
-		break;
-	case 48000:
-		clock_freq = 6144000; /* 6.1440MHz */
-		ch_sta[0] = 0x2 << 24;
-		ch_sta[1] = 0xD << 4;
-		break;
-	case 88200:
-		clock_freq = 11289600; /* 11.2896 MHz */
-		break;
-	case 96000:
-		clock_freq = 12288000; /* 12.288 MHz */
-		break;
-	case 176400:
-		clock_freq = 22579200; /* 22.5792 MHz */
-		break;
-	case 192000:
-		clock_freq = 24576000; /* 24.5760 MHz */
-		break;
-	default:
-		return -1;
-	}
-
-	spdif_clk = clk_get(&state->pdev->dev, NULL);
-	if (!spdif_clk) {
-		dev_err(&state->pdev->dev, "%s: could not get spdif clock\n",
-				__func__);
-		return -EIO;
-	}
-
-	clk_set_rate(spdif_clk, clock_freq);
-	if (clk_enable(spdif_clk)) {
-		dev_err(&state->pdev->dev,
-			"%s: failed to enable spdif_clk clock\n", __func__);
-		return -EIO;
-	}
-	pr_info("%s: spdif_clk rate %ld\n", __func__, clk_get_rate(spdif_clk));
-
-	spdif_writel(state->spdif_base, ch_sta[0], SPDIF_CH_STA_TX_A_0);
-	spdif_writel(state->spdif_base, ch_sta[1], SPDIF_CH_STA_TX_B_0);
-	spdif_writel(state->spdif_base, ch_sta[2], SPDIF_CH_STA_TX_C_0);
-	spdif_writel(state->spdif_base, ch_sta[3], SPDIF_CH_STA_TX_D_0);
-	spdif_writel(state->spdif_base, ch_sta[4], SPDIF_CH_STA_TX_E_0);
-	spdif_writel(state->spdif_base, ch_sta[5], SPDIF_CH_STA_TX_F_0);
-
-	return 0;
-}
-
-static int init_stream_buffer(struct audio_stream *, int);
-
-static int setup_dma(struct audio_driver_state *);
-static void tear_down_dma(struct audio_driver_state *);
-static void stop_dma_playback(struct audio_stream *);
-
-
-struct sound_ops {
-	int (*setup)(struct audio_driver_state *);
-	void (*tear_down)(struct audio_driver_state *);
-	void (*stop_playback)(struct audio_stream *);
-};
-
-static const struct sound_ops dma_sound_ops = {
-	.setup = setup_dma,
-	.tear_down = tear_down_dma,
-	.stop_playback = stop_dma_playback,
-};
-
-static const struct sound_ops *sound_ops = &dma_sound_ops;
-
-
-
-static bool stop_playback_if_necessary(struct audio_stream *aos)
-{
-	unsigned long flags;
-	spin_lock_irqsave(&aos->dma_req_lock, flags);
-	pr_debug("%s\n", __func__);
-	if (!pending_buffer_requests(aos)) {
-		pr_debug("%s: no more data to play back\n", __func__);
-		sound_ops->stop_playback(aos);
-		spin_unlock_irqrestore(&aos->dma_req_lock, flags);
-		allow_suspend(aos);
-		return true;
-	}
-	spin_unlock_irqrestore(&aos->dma_req_lock, flags);
-
-	return false;
-}
-
-/* playback */
-static bool wait_till_stopped(struct audio_stream *as)
-{
-	int rc;
-	pr_debug("%s: wait for completion\n", __func__);
-	rc = wait_for_completion_timeout(
-			&as->stop_completion, HZ);
-	if (!rc)
-		pr_err("%s: wait timed out", __func__);
-	if (rc < 0)
-		pr_err("%s: wait error %d\n", __func__, rc);
-	allow_suspend(as);
-	pr_debug("%s: done: %d\n", __func__, rc);
-	return true;
-}
-
-/* Ask for playback to stop.  The _nosync means that
- * as->lock has to be locked by the caller.
- */
-static void request_stop_nosync(struct audio_stream *as)
-{
-	int i;
-	pr_debug("%s\n", __func__);
-	if (!as->stop) {
-		as->stop = true;
-		if (pending_buffer_requests(as))
-			wait_till_stopped(as);
-		for (i = 0; i < as->num_bufs; i++) {
-			init_completion(&as->comp[i]);
-			complete(&as->comp[i]);
-		}
-	}
-	if (!tegra_dma_is_empty(as->dma_chan))
-		pr_err("%s: DMA not empty!\n", __func__);
-	/* Stop the DMA then dequeue anything that's in progress. */
-	tegra_dma_cancel(as->dma_chan);
-	as->active = false; /* applies to recording only */
-	pr_debug("%s: done\n", __func__);
-}
-
-static void setup_dma_tx_request(struct tegra_dma_req *req,
-		struct audio_stream *aos);
-
-static int setup_dma(struct audio_driver_state *ads)
-{
-	int rc, i;
-	pr_info("%s\n", __func__);
-
-	/* setup audio playback */
-	for (i = 0; i < ads->out.num_bufs; i++) {
-		ads->out.buf_phy[i] = dma_map_single(&ads->pdev->dev,
-				ads->out.buffer[i],
-				buf_size(&ads->out),
-				DMA_TO_DEVICE);
-		BUG_ON(!ads->out.buf_phy[i]);
-		setup_dma_tx_request(&ads->out.dma_req[i], &ads->out);
-		ads->out.dma_req[i].source_addr = ads->out.buf_phy[i];
-	}
-	ads->out.dma_chan =
-		 tegra_dma_allocate_channel(TEGRA_DMA_MODE_CONTINUOUS_SINGLE,
-			"spdif_tx_req_%d", ads->dma_req_sel);
-	if (!ads->out.dma_chan) {
-		pr_err("%s: error alloc output DMA channel: %ld\n",
-			__func__, PTR_ERR(ads->out.dma_chan));
-		rc = -ENODEV;
-		goto fail_tx;
-	}
-	return 0;
-
-
-fail_tx:
-
-	for (i = 0; i < ads->out.num_bufs; i++) {
-		dma_unmap_single(&ads->pdev->dev, ads->out.buf_phy[i],
-				buf_size(&ads->out),
-				DMA_TO_DEVICE);
-		ads->out.buf_phy[i] = 0;
-	}
-	tegra_dma_free_channel(ads->out.dma_chan);
-	ads->out.dma_chan = 0;
-
-
-	return rc;
-}
-
-static void tear_down_dma(struct audio_driver_state *ads)
-{
-	int i;
-	pr_info("%s\n", __func__);
-
-
-	tegra_dma_free_channel(ads->out.dma_chan);
-	for (i = 0; i < ads->out.num_bufs; i++) {
-		dma_unmap_single(&ads->pdev->dev, ads->out.buf_phy[i],
-				buf_size(&ads->out),
-				DMA_TO_DEVICE);
-		ads->out.buf_phy[i] = 0;
-	}
-
-	ads->out.dma_chan = NULL;
-}
-
-static void dma_tx_complete_callback(struct tegra_dma_req *req)
-{
-	struct audio_stream *aos = req->dev;
-	unsigned req_num;
-
-	req_num = req - aos->dma_req;
-	pr_debug("%s: completed buffer %d size %d\n", __func__,
-			req_num, req->bytes_transferred);
-	BUG_ON(req_num >= aos->num_bufs);
-
-	complete(&aos->comp[req_num]);
-
-	if (!pending_buffer_requests(aos)) {
-		pr_debug("%s: Playback underflow", __func__);
-		complete(&aos->stop_completion);
-	}
-}
-
-
-static void setup_dma_tx_request(struct tegra_dma_req *req,
-		struct audio_stream *aos)
-{
-	struct audio_driver_state *ads = ads_from_out(aos);
-
-	memset(req, 0, sizeof(*req));
-
-	req->complete = dma_tx_complete_callback;
-	req->dev = aos;
-	req->to_memory = false;
-	req->dest_addr = spdif_get_fifo_phy_base(ads->spdif_phys);
-	req->dest_bus_width = 32;
-	req->dest_wrap = 4;
-	req->source_wrap = 0;
-	req->source_bus_width = 32;
-	req->req_sel = ads->dma_req_sel;
-}
-
-
-static int start_playback(struct audio_stream *aos,
-			struct tegra_dma_req *req)
-{
-	int rc;
-	unsigned long flags;
-	struct audio_driver_state *ads = ads_from_out(aos);
-
-	pr_debug("%s: (writing %d)\n",
-			__func__, req->size);
-
-	spin_lock_irqsave(&aos->dma_req_lock, flags);
-#if 0
-	spdif_fifo_clear(ads->spdif_base);
-#endif
-
-	spdif_fifo_set_attention_level(ads->spdif_base,
-		ads->out.spdif_fifo_atn_level);
-
-	if (ads->fifo_init) {
-		spdif_set_bit_mode(ads->spdif_base, SPDIF_BIT_MODE_MODE16BIT);
-		spdif_set_fifo_packed(ads->spdif_base, 1);
-		ads->fifo_init = false;
-	}
-
-	spdif_fifo_enable(ads->spdif_base, 1);
-
-	rc = tegra_dma_enqueue_req(aos->dma_chan, req);
-	spin_unlock_irqrestore(&aos->dma_req_lock, flags);
-
-	if (rc)
-		pr_err("%s: could not enqueue TX DMA req\n", __func__);
-	return rc;
-}
-
-/* Called with aos->dma_req_lock taken. */
-static void stop_dma_playback(struct audio_stream *aos)
-{
-	int spin = 0;
-	struct audio_driver_state *ads = ads_from_out(aos);
-	pr_debug("%s\n", __func__);
-	spdif_fifo_enable(ads->spdif_base, 0);
-	while ((spdif_get_status(ads->spdif_base) & SPDIF_STATUS_0_TX_BSY) &&
-			spin < 100) {
-		udelay(10);
-		if (spin++ > 50)
-			pr_info("%s: spin %d\n", __func__, spin);
-	}
-	if (spin == 100)
-		pr_warn("%s: spinny\n", __func__);
-	ads->fifo_init = true;
-}
-
-
-
-static irqreturn_t spdif_interrupt(int irq, void *data)
-{
-	struct audio_driver_state *ads = data;
-	u32 status = spdif_get_status(ads->spdif_base);
-
-	pr_debug("%s: %08x\n", __func__, status);
-
-/*	if (status & SPDIF_STATUS_0_TX_ERR) */
-		spdif_ack_status(ads->spdif_base);
-
-	pr_debug("%s: done %08x\n", __func__,
-			spdif_get_status(ads->spdif_base));
-	return IRQ_HANDLED;
-}
-
-static ssize_t tegra_spdif_write(struct file *file,
-		const char __user *buf, size_t size, loff_t *off)
-{
-	ssize_t rc = 0;
-	int out_buf;
-	struct tegra_dma_req *req;
-	struct audio_driver_state *ads = ads_from_misc_out(file);
-
-	mutex_lock(&ads->out.lock);
-
-	if (!IS_ALIGNED(size, 4) || size < 4 || size > buf_size(&ads->out)) {
-		pr_err("%s: invalid user size %d\n", __func__, size);
-		rc = -EINVAL;
-		goto done;
-	}
-
-	pr_debug("%s: write %d bytes\n", __func__, size);
-
-	if (ads->out.stop) {
-		pr_debug("%s: playback has been cancelled\n", __func__);
-		goto done;
-	}
-
-	/* Decide which buf is next. */
-	out_buf = (ads->out.last_queued + 1) % ads->out.num_bufs;
-	req = &ads->out.dma_req[out_buf];
-
-	/* Wait for the buffer to be emptied (complete).  The maximum timeout
-	 * value could be calculated dynamically based on buf_size(&ads->out).
-	 * For a buffer size of 16k, at 44.1kHz/stereo/16-bit PCM, you would
-	 * have ~93ms.
-	 */
-	pr_debug("%s: waiting for buffer %d\n", __func__, out_buf);
-	rc = wait_for_completion_interruptible_timeout(
-				&ads->out.comp[out_buf], HZ);
-	if (!rc) {
-		pr_err("%s: timeout", __func__);
-		rc = -ETIMEDOUT;
-		goto done;
-	} else if (rc < 0) {
-		pr_err("%s: wait error %d", __func__, rc);
-		goto done;
-	}
-
-	/* Fill the buffer and enqueue it. */
-	pr_debug("%s: acquired buffer %d, copying data\n", __func__, out_buf);
-	rc = copy_from_user(ads->out.buffer[out_buf], buf, size);
-	if (rc) {
-		rc = -EFAULT;
-		goto done;
-	}
-
-	prevent_suspend(&ads->out);
-
-	req->size = size;
-	dma_sync_single_for_device(NULL,
-			req->source_addr, req->size, DMA_TO_DEVICE);
-	ads->out.last_queued = out_buf;
-	init_completion(&ads->out.stop_completion);
-
-	rc = start_playback(&ads->out, req);
-	if (!rc)
-		rc = size;
-	else
-		allow_suspend(&ads->out);
-
-done:
-	mutex_unlock(&ads->out.lock);
-	return rc;
-}
-
-static long tegra_spdif_out_ioctl(struct file *file,
-			unsigned int cmd, unsigned long arg)
-{
-	int rc = 0;
-	struct audio_driver_state *ads = ads_from_misc_out_ctl(file);
-	struct audio_stream *aos = &ads->out;
-
-	mutex_lock(&aos->lock);
-
-	switch (cmd) {
-	case TEGRA_AUDIO_OUT_FLUSH:
-		if (pending_buffer_requests(aos)) {
-			pr_debug("%s: flushing\n", __func__);
-			request_stop_nosync(aos);
-			pr_debug("%s: flushed\n", __func__);
-		}
-		if (stop_playback_if_necessary(aos))
-			pr_debug("%s: done (stopped)\n", __func__);
-		aos->stop = false;
-		break;
-	case TEGRA_AUDIO_OUT_SET_NUM_BUFS: {
-		unsigned int num;
-		if (copy_from_user(&num, (const void __user *)arg,
-					sizeof(num))) {
-			rc = -EFAULT;
-			break;
-		}
-		if (!num || num > SPDIF_MAX_NUM_BUFS) {
-			pr_err("%s: invalid buffer count %d\n", __func__, num);
-			rc = -EINVAL;
-			break;
-		}
-		if (pending_buffer_requests(aos)) {
-			pr_err("%s: playback in progress\n", __func__);
-			rc = -EBUSY;
-			break;
-		}
-		rc = init_stream_buffer(aos, num);
-		if (rc < 0)
-			break;
-		aos->num_bufs = num;
-		sound_ops->setup(ads);
-	}
-		break;
-	case TEGRA_AUDIO_OUT_GET_NUM_BUFS:
-		if (copy_to_user((void __user *)arg,
-				&aos->num_bufs, sizeof(aos->num_bufs)))
-			rc = -EFAULT;
-		break;
-	default:
-		rc = -EINVAL;
-	}
-
-	mutex_unlock(&aos->lock);
-	return rc;
-}
-
-
-static int tegra_spdif_out_open(struct inode *inode, struct file *file)
-{
-	int rc = 0;
-	int i;
-	struct audio_driver_state *ads = ads_from_misc_out(file);
-
-	pr_debug("%s\n", __func__);
-
-	mutex_lock(&ads->out.lock);
-
-	if (ads->out.opened) {
-		rc = -EBUSY;
-		goto done;
-	}
-
-	ads->out.opened = 1;
-	ads->out.stop = false;
-
-	for (i = 0; i < SPDIF_MAX_NUM_BUFS; i++) {
-		init_completion(&ads->out.comp[i]);
-		/* TX buf rest state is unqueued, complete. */
-		complete(&ads->out.comp[i]);
-	}
-
-done:
-	mutex_unlock(&ads->out.lock);
-	return rc;
-}
-
-static int tegra_spdif_out_release(struct inode *inode, struct file *file)
-{
-	struct audio_driver_state *ads = ads_from_misc_out(file);
-
-	pr_debug("%s\n", __func__);
-
-	mutex_lock(&ads->out.lock);
-	ads->out.opened = 0;
-	request_stop_nosync(&ads->out);
-	if (stop_playback_if_necessary(&ads->out))
-		pr_debug("%s: done (stopped)\n", __func__);
-	allow_suspend(&ads->out);
-	mutex_unlock(&ads->out.lock);
-	pr_debug("%s: done\n", __func__);
-	return 0;
-}
-
-
-static const struct file_operations tegra_spdif_out_fops = {
-	.owner = THIS_MODULE,
-	.open = tegra_spdif_out_open,
-	.release = tegra_spdif_out_release,
-	.write = tegra_spdif_write,
-};
-
-static int tegra_spdif_ctl_open(struct inode *inode, struct file *file)
-{
-	return 0;
-}
-
-static int tegra_spdif_ctl_release(struct inode *inode, struct file *file)
-{
-	return 0;
-}
-
-static const struct file_operations tegra_spdif_out_ctl_fops = {
-	.owner = THIS_MODULE,
-	.open = tegra_spdif_ctl_open,
-	.release = tegra_spdif_ctl_release,
-	.unlocked_ioctl = tegra_spdif_out_ioctl,
-};
-
-static int init_stream_buffer(struct audio_stream *s, int num)
-{
-	int i, j;
-	pr_debug("%s (num %d)\n", __func__,  num);
-
-	for (i = 0; i < num; i++) {
-		kfree(s->buffer[i]);
-		s->buffer[i] =
-			kmalloc(buf_size(s), GFP_KERNEL | GFP_DMA);
-		if (!s->buffer[i]) {
-			pr_err("%s: could not allocate buffer\n", __func__);
-			for (j = i - 1; j >= 0; j--) {
-				kfree(s->buffer[j]);
-				s->buffer[j] = 0;
-			}
-			return -ENOMEM;
-		}
-	}
-	return 0;
-}
-
-
-static int setup_misc_device(struct miscdevice *misc,
-			const struct file_operations  *fops,
-			const char *fmt, ...)
-{
-	int rc = 0;
-	va_list args;
-	const int sz = 64;
-
-	va_start(args, fmt);
-
-	memset(misc, 0, sizeof(*misc));
-	misc->minor = MISC_DYNAMIC_MINOR;
-	misc->name  = kmalloc(sz, GFP_KERNEL);
-	if (!misc->name) {
-		rc = -ENOMEM;
-		goto done;
-	}
-
-	vsnprintf((char *)misc->name, sz, fmt, args);
-	misc->fops = fops;
-	if (misc_register(misc)) {
-		pr_err("%s: could not register %s\n", __func__, misc->name);
-		kfree(misc->name);
-		rc = -EIO;
-		goto done;
-	}
-
-done:
-	va_end(args);
-	return rc;
-}
-
-static ssize_t dma_toggle_show(struct device *dev,
-				struct device_attribute *attr,
-				char *buf)
-{
-	return sprintf(buf, "dma\n");
-}
-
-static ssize_t dma_toggle_store(struct device *dev,
-			struct device_attribute *attr,
-			const char *buf, size_t count)
-{
-	pr_err("%s: Not implemented.", __func__);
-	return 0;
-}
-
-static DEVICE_ATTR(dma_toggle, 0644, dma_toggle_show, dma_toggle_store);
-
-static ssize_t __attr_fifo_atn_read(char *buf, int atn_lvl)
-{
-	switch (atn_lvl) {
-	case SPDIF_FIFO_ATN_LVL_ONE_SLOT:
-		strncpy(buf, "1\n", 2);
-		return 2;
-	case SPDIF_FIFO_ATN_LVL_FOUR_SLOTS:
-		strncpy(buf, "4\n", 2);
-		return 2;
-	case SPDIF_FIFO_ATN_LVL_EIGHT_SLOTS:
-		strncpy(buf, "8\n", 2);
-		return 2;
-	case SPDIF_FIFO_ATN_LVL_TWELVE_SLOTS:
-		strncpy(buf, "12\n", 3);
-		return 3;
-	default:
-		BUG_ON(1);
-		return -EIO;
-	}
-}
-
-static ssize_t __attr_fifo_atn_write(struct audio_driver_state *ads,
-		struct audio_stream *as,
-		int *fifo_lvl,
-		const char *buf, size_t size)
-{
-	int lvl;
-
-	if (size > 3) {
-		pr_err("%s: buffer size %d too big\n", __func__, size);
-		return -EINVAL;
-	}
-
-	if (sscanf(buf, "%d", &lvl) != 1) {
-		pr_err("%s: invalid input string [%s]\n", __func__, buf);
-		return -EINVAL;
-	}
-
-	switch (lvl) {
-	case 1:
-		lvl = SPDIF_FIFO_ATN_LVL_ONE_SLOT;
-		break;
-	case 4:
-		lvl = SPDIF_FIFO_ATN_LVL_FOUR_SLOTS;
-		break;
-	case 8:
-		lvl = SPDIF_FIFO_ATN_LVL_EIGHT_SLOTS;
-		break;
-	case 12:
-		lvl = SPDIF_FIFO_ATN_LVL_TWELVE_SLOTS;
-		break;
-	default:
-		pr_err("%s: invalid attention level %d\n", __func__, lvl);
-		return -EINVAL;
-	}
-
-	*fifo_lvl = lvl;
-	pr_info("%s: fifo level %d\n", __func__, *fifo_lvl);
-
-	return size;
-}
-
-static ssize_t tx_fifo_atn_show(struct device *dev,
-				struct device_attribute *attr,
-				char *buf)
-{
-	struct tegra_audio_platform_data *pdata = dev->platform_data;
-	struct audio_driver_state *ads = pdata->driver_data;
-	return __attr_fifo_atn_read(buf, ads->out.spdif_fifo_atn_level);
-}
-
-static ssize_t tx_fifo_atn_store(struct device *dev,
-			struct device_attribute *attr,
-			const char *buf, size_t count)
-{
-	ssize_t rc;
-	struct tegra_audio_platform_data *pdata = dev->platform_data;
-	struct audio_driver_state *ads = pdata->driver_data;
-	mutex_lock(&ads->out.lock);
-	if (pending_buffer_requests(&ads->out)) {
-		pr_err("%s: playback in progress.\n", __func__);
-		rc = -EBUSY;
-		goto done;
-	}
-	rc = __attr_fifo_atn_write(ads, &ads->out,
-			&ads->out.spdif_fifo_atn_level,
-			buf, count);
-done:
-	mutex_unlock(&ads->out.lock);
-	return rc;
-}
-
-static DEVICE_ATTR(tx_fifo_atn, 0644, tx_fifo_atn_show, tx_fifo_atn_store);
-
-
-static int spdif_configure(struct platform_device *pdev)
-{
-	struct tegra_audio_platform_data *pdata = pdev->dev.platform_data;
-	struct audio_driver_state *state = pdata->driver_data;
-
-	if (!state)
-		return -ENOMEM;
-
-	/* disable interrupts from SPDIF */
-	spdif_writel(state->spdif_base, 0x0, SPDIF_CTRL_0);
-	spdif_fifo_clear(state->spdif_base);
-	spdif_enable_fifos(state->spdif_base, 0);
-
-	spdif_set_bit_mode(state->spdif_base, SPDIF_BIT_MODE_MODE16BIT);
-	spdif_set_fifo_packed(state->spdif_base, 1);
-
-	spdif_fifo_set_attention_level(state->spdif_base,
-		state->out.spdif_fifo_atn_level);
-
-	spdif_set_sample_rate(state, 44100);
-
-	state->fifo_init = true;
-	return 0;
-}
-
-static int tegra_spdif_probe(struct platform_device *pdev)
-{
-	int rc, i;
-	struct resource *res;
-	struct audio_driver_state *state;
-
-	pr_info("%s\n", __func__);
-
-	state = kzalloc(sizeof(*state), GFP_KERNEL);
-	if (!state)
-		return -ENOMEM;
-
-	state->pdev = pdev;
-	state->pdata = pdev->dev.platform_data;
-	state->pdata->driver_data = state;
-	BUG_ON(!state->pdata);
-
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res) {
-		dev_err(&pdev->dev, "no mem resource!\n");
-		return -ENODEV;
-	}
-
-	if (!request_mem_region(res->start, resource_size(res), pdev->name)) {
-		dev_err(&pdev->dev, "memory region already claimed!\n");
-		return -ENOMEM;
-	}
-
-	state->spdif_phys = res->start;
-	state->spdif_base = (unsigned long)ioremap(res->start,
-			res->end - res->start + 1);
-	if (!state->spdif_base) {
-		dev_err(&pdev->dev, "cannot remap iomem!\n");
-		return -EIO;
-	}
-
-	res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
-	if (!res) {
-		dev_err(&pdev->dev, "no dma resource!\n");
-		return -ENODEV;
-	}
-	state->dma_req_sel = res->start;
-
-	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
-	if (!res) {
-		dev_err(&pdev->dev, "no irq resource!\n");
-		return -ENODEV;
-	}
-	state->irq = res->start;
-
-	rc = spdif_configure(pdev);
-	if (rc < 0)
-		return rc;
-
-	state->out.opened = 0;
-	state->out.active = false;
-	mutex_init(&state->out.lock);
-	init_completion(&state->out.stop_completion);
-	spin_lock_init(&state->out.dma_req_lock);
-	state->out.dma_chan = NULL;
-	state->out.num_bufs = SPDIF_DEFAULT_TX_NUM_BUFS;
-	for (i = 0; i < SPDIF_MAX_NUM_BUFS; i++) {
-		init_completion(&state->out.comp[i]);
-			/* TX buf rest state is unqueued, complete. */
-		complete(&state->out.comp[i]);
-		state->out.buffer[i] = 0;
-		state->out.buf_phy[i] = 0;
-	}
-	state->out.last_queued = 0;
-	rc = init_stream_buffer(&state->out, state->out.num_bufs);
-	if (rc < 0)
-		return rc;
-
-	INIT_WORK(&state->out.allow_suspend_work, allow_suspend_worker);
-	snprintf(state->out.wake_lock_name, sizeof(state->out.wake_lock_name),
-		"tegra-audio-spdif");
-	wake_lock_init(&state->out.wake_lock, WAKE_LOCK_SUSPEND,
-			state->out.wake_lock_name);
-
-	if (request_irq(state->irq, spdif_interrupt,
-			IRQF_DISABLED, state->pdev->name, state) < 0) {
-		dev_err(&pdev->dev,
-			"%s: could not register handler for irq %d\n",
-			__func__, state->irq);
-		return -EIO;
-	}
-
-	rc = setup_misc_device(&state->misc_out,
-			&tegra_spdif_out_fops,
-			"spdif_out");
-	if (rc < 0)
-		return rc;
-
-	rc = setup_misc_device(&state->misc_out_ctl,
-			&tegra_spdif_out_ctl_fops,
-			"spdif_out_ctl");
-	if (rc < 0)
-		return rc;
-
-	sound_ops->setup(state);
-
-	rc = device_create_file(&pdev->dev, &dev_attr_dma_toggle);
-	if (rc < 0) {
-		dev_err(&pdev->dev, "%s: could not create sysfs entry %s: %d\n",
-			__func__, dev_attr_dma_toggle.attr.name, rc);
-		return rc;
-	}
-
-	rc = device_create_file(&pdev->dev, &dev_attr_tx_fifo_atn);
-	if (rc < 0) {
-		dev_err(&pdev->dev, "%s: could not create sysfs entry %s: %d\n",
-			__func__, dev_attr_tx_fifo_atn.attr.name, rc);
-		return rc;
-	}
-
-	return 0;
-}
-
-#ifdef CONFIG_PM_SLEEP
-static int tegra_spdif_suspend(struct platform_device *pdev, pm_message_t mesg)
-{
-	/* dev_info(&pdev->dev, "%s\n", __func__); */
-	return 0;
-}
-
-static int tegra_spdif_resume(struct platform_device *pdev)
-{
-	return spdif_configure(pdev);
-}
-#endif /* CONFIG_PM_SLEEP */
-
-static struct platform_driver tegra_spdif_driver = {
-	.driver = {
-		.name = "spdif_out",
-		.owner = THIS_MODULE,
-	},
-	.probe = tegra_spdif_probe,
-#ifdef CONFIG_PM_SLEEP
-	.suspend = tegra_spdif_suspend,
-	.resume = tegra_spdif_resume,
-#endif
-};
-
-static int __init tegra_spdif_init(void)
-{
-	return platform_driver_register(&tegra_spdif_driver);
-}
-
-module_init(tegra_spdif_init);
-MODULE_LICENSE("GPL");