sound/soc/blackfin/bf5xx-tdm.c - kernel/skids - Git at Google

 /*
  * File:         sound/soc/blackfin/bf5xx-tdm.c
  * Author:       Barry Song <Barry.Song@analog.com>
  *
  * Created:      Thurs June 04 2009
  * Description:  Blackfin I2S(TDM) CPU DAI driver
  *              Even though TDM mode can be as part of I2S DAI, but there
  *              are so much difference in configuration and data flow,
  *              it's very ugly to integrate I2S and TDM into a module
  *
  * Modified:
  *               Copyright 2009 Analog Devices Inc.
  *
  * Bugs:         Enter bugs at http://blackfin.uclinux.org/
  *
  * 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, see the file COPYING, or write
  * to the Free Software Foundation, Inc.,
  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  */

 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/device.h>
 #include <sound/core.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
 #include <sound/initval.h>
 #include <sound/soc.h>

 #include <asm/irq.h>
 #include <asm/portmux.h>
 #include <linux/mutex.h>
 #include <linux/gpio.h>

 #include "bf5xx-sport.h"
 #include "bf5xx-tdm.h"

 static struct bf5xx_tdm_port bf5xx_tdm;
 static int sport_num = CONFIG_SND_BF5XX_SPORT_NUM;

 static struct sport_param sport_params[2] = {
 	{
 		.dma_rx_chan    = CH_SPORT0_RX,
 		.dma_tx_chan    = CH_SPORT0_TX,
 		.err_irq        = IRQ_SPORT0_ERROR,
 		.regs           = (struct sport_register *)SPORT0_TCR1,
 	},
 	{
 		.dma_rx_chan    = CH_SPORT1_RX,
 		.dma_tx_chan    = CH_SPORT1_TX,
 		.err_irq        = IRQ_SPORT1_ERROR,
 		.regs           = (struct sport_register *)SPORT1_TCR1,
 	}
 };

 /*
  * Setting the TFS pin selector for SPORT 0 based on whether the selected
  * port id F or G. If the port is F then no conflict should exist for the
  * TFS. When Port G is selected and EMAC then there is a conflict between
  * the PHY interrupt line and TFS.  Current settings prevent the conflict
  * by ignoring the TFS pin when Port G is selected. This allows both
  * codecs and EMAC using Port G concurrently.
  */
 #ifdef CONFIG_BF527_SPORT0_PORTG
 #define LOCAL_SPORT0_TFS (0)
 #else
 #define LOCAL_SPORT0_TFS (P_SPORT0_TFS)
 #endif

 static u16 sport_req[][7] = { {P_SPORT0_DTPRI, P_SPORT0_TSCLK, P_SPORT0_RFS,
 	P_SPORT0_DRPRI, P_SPORT0_RSCLK, LOCAL_SPORT0_TFS, 0},
 	   {P_SPORT1_DTPRI, P_SPORT1_TSCLK, P_SPORT1_RFS, P_SPORT1_DRPRI,
 		   P_SPORT1_RSCLK, P_SPORT1_TFS, 0} };

 static int bf5xx_tdm_set_dai_fmt(struct snd_soc_dai *cpu_dai,
 	unsigned int fmt)
 {
 	int ret = 0;

 	/* interface format:support TDM,slave mode */
 	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 	case SND_SOC_DAIFMT_DSP_A:
 		break;
 	default:
 		printk(KERN_ERR "%s: Unknown DAI format type\n", __func__);
 		ret = -EINVAL;
 		break;
 	}

 	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 	case SND_SOC_DAIFMT_CBM_CFM:
 		break;
 	case SND_SOC_DAIFMT_CBS_CFS:
 	case SND_SOC_DAIFMT_CBM_CFS:
 	case SND_SOC_DAIFMT_CBS_CFM:
 		ret = -EINVAL;
 		break;
 	default:
 		printk(KERN_ERR "%s: Unknown DAI master type\n", __func__);
 		ret = -EINVAL;
 		break;
 	}

 	return ret;
 }

 static int bf5xx_tdm_hw_params(struct snd_pcm_substream *substream,
 	struct snd_pcm_hw_params *params,
 	struct snd_soc_dai *dai)
 {
 	int ret = 0;

 	bf5xx_tdm.tcr2 &= ~0x1f;
 	bf5xx_tdm.rcr2 &= ~0x1f;
 	switch (params_format(params)) {
 	case SNDRV_PCM_FORMAT_S32_LE:
 		bf5xx_tdm.tcr2 |= 31;
 		bf5xx_tdm.rcr2 |= 31;
 		sport_handle->wdsize = 4;
 		break;
 		/* at present, we only support 32bit transfer */
 	default:
 		pr_err("not supported PCM format yet\n");
 		return -EINVAL;
 		break;
 	}

 	if (!bf5xx_tdm.configured) {
 		/*
 		 * TX and RX are not independent,they are enabled at the
 		 * same time, even if only one side is running. So, we
 		 * need to configure both of them at the time when the first
 		 * stream is opened.
 		 *
 		 * CPU DAI:slave mode.
 		 */
 		ret = sport_config_rx(sport_handle, bf5xx_tdm.rcr1,
 			bf5xx_tdm.rcr2, 0, 0);
 		if (ret) {
 			pr_err("SPORT is busy!\n");
 			return -EBUSY;
 		}

 		ret = sport_config_tx(sport_handle, bf5xx_tdm.tcr1,
 			bf5xx_tdm.tcr2, 0, 0);
 		if (ret) {
 			pr_err("SPORT is busy!\n");
 			return -EBUSY;
 		}

 		bf5xx_tdm.configured = 1;
 	}

 	return 0;
 }

 static void bf5xx_tdm_shutdown(struct snd_pcm_substream *substream,
 	struct snd_soc_dai *dai)
 {
 	/* No active stream, SPORT is allowed to be configured again. */
 	if (!dai->active)
 		bf5xx_tdm.configured = 0;
 }

 static int bf5xx_tdm_set_channel_map(struct snd_soc_dai *dai,
 		unsigned int tx_num, unsigned int *tx_slot,
 		unsigned int rx_num, unsigned int *rx_slot)
 {
 	int i;
 	unsigned int slot;
 	unsigned int tx_mapped = 0, rx_mapped = 0;

 	if ((tx_num > BFIN_TDM_DAI_MAX_SLOTS) ||
 			(rx_num > BFIN_TDM_DAI_MAX_SLOTS))
 		return -EINVAL;

 	for (i = 0; i < tx_num; i++) {
 		slot = tx_slot[i];
 		if ((slot < BFIN_TDM_DAI_MAX_SLOTS) &&
 				(!(tx_mapped & (1 << slot)))) {
 			bf5xx_tdm.tx_map[i] = slot;
 			tx_mapped |= 1 << slot;
 		} else
 			return -EINVAL;
 	}
 	for (i = 0; i < rx_num; i++) {
 		slot = rx_slot[i];
 		if ((slot < BFIN_TDM_DAI_MAX_SLOTS) &&
 				(!(rx_mapped & (1 << slot)))) {
 			bf5xx_tdm.rx_map[i] = slot;
 			rx_mapped |= 1 << slot;
 		} else
 			return -EINVAL;
 	}

 	return 0;
 }

 #ifdef CONFIG_PM
 static int bf5xx_tdm_suspend(struct snd_soc_dai *dai)
 {
 	struct sport_device *sport =
 		(struct sport_device *)dai->private_data;

 	if (!dai->active)
 		return 0;
 	if (dai->capture.active)
 		sport_rx_stop(sport);
 	if (dai->playback.active)
 		sport_tx_stop(sport);
 	return 0;
 }

 static int bf5xx_tdm_resume(struct snd_soc_dai *dai)
 {
 	int ret;
 	struct sport_device *sport =
 		(struct sport_device *)dai->private_data;

 	if (!dai->active)
 		return 0;

 	ret = sport_set_multichannel(sport, 8, 0xFF, 1);
 	if (ret) {
 		pr_err("SPORT is busy!\n");
 		ret = -EBUSY;
 	}

 	ret = sport_config_rx(sport, IRFS, 0x1F, 0, 0);
 	if (ret) {
 		pr_err("SPORT is busy!\n");
 		ret = -EBUSY;
 	}

 	ret = sport_config_tx(sport, ITFS, 0x1F, 0, 0);
 	if (ret) {
 		pr_err("SPORT is busy!\n");
 		ret = -EBUSY;
 	}

 	return 0;
 }

 #else
 #define bf5xx_tdm_suspend      NULL
 #define bf5xx_tdm_resume       NULL
 #endif

 static struct snd_soc_dai_ops bf5xx_tdm_dai_ops = {
 	.hw_params      = bf5xx_tdm_hw_params,
 	.set_fmt        = bf5xx_tdm_set_dai_fmt,
 	.shutdown       = bf5xx_tdm_shutdown,
 	.set_channel_map   = bf5xx_tdm_set_channel_map,
 };

 struct snd_soc_dai bf5xx_tdm_dai = {
 	.name = "bf5xx-tdm",
 	.id = 0,
 	.suspend = bf5xx_tdm_suspend,
 	.resume = bf5xx_tdm_resume,
 	.playback = {
 		.channels_min = 2,
 		.channels_max = 8,
 		.rates = SNDRV_PCM_RATE_48000,
 		.formats = SNDRV_PCM_FMTBIT_S32_LE,},
 	.capture = {
 		.channels_min = 2,
 		.channels_max = 8,
 		.rates = SNDRV_PCM_RATE_48000,
 		.formats = SNDRV_PCM_FMTBIT_S32_LE,},
 	.ops = &bf5xx_tdm_dai_ops,
 };
 EXPORT_SYMBOL_GPL(bf5xx_tdm_dai);

 static int __devinit bfin_tdm_probe(struct platform_device *pdev)
 {
 	int ret = 0;

 	if (peripheral_request_list(&sport_req[sport_num][0], "soc-audio")) {
 		pr_err("Requesting Peripherals failed\n");
 		return -EFAULT;
 	}

 	/* request DMA for SPORT */
 	sport_handle = sport_init(&sport_params[sport_num], 4, \
 		8 * sizeof(u32), NULL);
 	if (!sport_handle) {
 		peripheral_free_list(&sport_req[sport_num][0]);
 		return -ENODEV;
 	}

 	/* SPORT works in TDM mode */
 	ret = sport_set_multichannel(sport_handle, 8, 0xFF, 1);
 	if (ret) {
 		pr_err("SPORT is busy!\n");
 		ret = -EBUSY;
 		goto sport_config_err;
 	}

 	ret = sport_config_rx(sport_handle, IRFS, 0x1F, 0, 0);
 	if (ret) {
 		pr_err("SPORT is busy!\n");
 		ret = -EBUSY;
 		goto sport_config_err;
 	}

 	ret = sport_config_tx(sport_handle, ITFS, 0x1F, 0, 0);
 	if (ret) {
 		pr_err("SPORT is busy!\n");
 		ret = -EBUSY;
 		goto sport_config_err;
 	}

 	ret = snd_soc_register_dai(&bf5xx_tdm_dai);
 	if (ret) {
 		pr_err("Failed to register DAI: %d\n", ret);
 		goto sport_config_err;
 	}

 	sport_handle->private_data = &bf5xx_tdm;
 	return 0;

 sport_config_err:
 	peripheral_free_list(&sport_req[sport_num][0]);
 	return ret;
 }

 static int __devexit bfin_tdm_remove(struct platform_device *pdev)
 {
 	peripheral_free_list(&sport_req[sport_num][0]);
 	snd_soc_unregister_dai(&bf5xx_tdm_dai);

 	return 0;
 }

 static struct platform_driver bfin_tdm_driver = {
 	.probe  = bfin_tdm_probe,
 	.remove = __devexit_p(bfin_tdm_remove),
 	.driver = {
 		.name   = "bfin-tdm",
 		.owner  = THIS_MODULE,
 	},
 };

 static int __init bfin_tdm_init(void)
 {
 	return platform_driver_register(&bfin_tdm_driver);
 }
 module_init(bfin_tdm_init);

 static void __exit bfin_tdm_exit(void)
 {
 	platform_driver_unregister(&bfin_tdm_driver);
 }
 module_exit(bfin_tdm_exit);

 /* Module information */
 MODULE_AUTHOR("Barry Song");
 MODULE_DESCRIPTION("TDM driver for ADI Blackfin");
 MODULE_LICENSE("GPL");
	/*
	* File: sound/soc/blackfin/bf5xx-tdm.c
	* Author: Barry Song <Barry.Song@analog.com>
	*
	* Created: Thurs June 04 2009
	* Description: Blackfin I2S(TDM) CPU DAI driver
	* Even though TDM mode can be as part of I2S DAI, but there
	* are so much difference in configuration and data flow,
	* it's very ugly to integrate I2S and TDM into a module
	*
	* Modified:
	* Copyright 2009 Analog Devices Inc.
	*
	* Bugs: Enter bugs at http://blackfin.uclinux.org/
	*
	* 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, see the file COPYING, or write
	* to the Free Software Foundation, Inc.,
	* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	*/

	#include <linux/init.h>
	#include <linux/module.h>
	#include <linux/device.h>
	#include <sound/core.h>
	#include <sound/pcm.h>
	#include <sound/pcm_params.h>
	#include <sound/initval.h>
	#include <sound/soc.h>

	#include <asm/irq.h>
	#include <asm/portmux.h>
	#include <linux/mutex.h>
	#include <linux/gpio.h>

	#include "bf5xx-sport.h"
	#include "bf5xx-tdm.h"

	static struct bf5xx_tdm_port bf5xx_tdm;
	static int sport_num = CONFIG_SND_BF5XX_SPORT_NUM;

	static struct sport_param sport_params[2] = {
	{
	.dma_rx_chan = CH_SPORT0_RX,
	.dma_tx_chan = CH_SPORT0_TX,
	.err_irq = IRQ_SPORT0_ERROR,
	.regs = (struct sport_register *)SPORT0_TCR1,
	},
	{
	.dma_rx_chan = CH_SPORT1_RX,
	.dma_tx_chan = CH_SPORT1_TX,
	.err_irq = IRQ_SPORT1_ERROR,
	.regs = (struct sport_register *)SPORT1_TCR1,
	}
	};

	/*
	* Setting the TFS pin selector for SPORT 0 based on whether the selected
	* port id F or G. If the port is F then no conflict should exist for the
	* TFS. When Port G is selected and EMAC then there is a conflict between
	* the PHY interrupt line and TFS. Current settings prevent the conflict
	* by ignoring the TFS pin when Port G is selected. This allows both
	* codecs and EMAC using Port G concurrently.
	*/
	#ifdef CONFIG_BF527_SPORT0_PORTG
	#define LOCAL_SPORT0_TFS (0)
	#else
	#define LOCAL_SPORT0_TFS (P_SPORT0_TFS)
	#endif

	static u16 sport_req[][7] = { {P_SPORT0_DTPRI, P_SPORT0_TSCLK, P_SPORT0_RFS,
	P_SPORT0_DRPRI, P_SPORT0_RSCLK, LOCAL_SPORT0_TFS, 0},
	{P_SPORT1_DTPRI, P_SPORT1_TSCLK, P_SPORT1_RFS, P_SPORT1_DRPRI,
	P_SPORT1_RSCLK, P_SPORT1_TFS, 0} };

	static int bf5xx_tdm_set_dai_fmt(struct snd_soc_dai *cpu_dai,
	unsigned int fmt)
	{
	int ret = 0;

	/* interface format:support TDM,slave mode */
	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_DSP_A:
	break;
	default:
	printk(KERN_ERR "%s: Unknown DAI format type\n", __func__);
	ret = -EINVAL;
	break;
	}

	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
	case SND_SOC_DAIFMT_CBM_CFM:
	break;
	case SND_SOC_DAIFMT_CBS_CFS:
	case SND_SOC_DAIFMT_CBM_CFS:
	case SND_SOC_DAIFMT_CBS_CFM:
	ret = -EINVAL;
	break;
	default:
	printk(KERN_ERR "%s: Unknown DAI master type\n", __func__);
	ret = -EINVAL;
	break;
	}

	return ret;
	}

	static int bf5xx_tdm_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params,
	struct snd_soc_dai *dai)
	{
	int ret = 0;

	bf5xx_tdm.tcr2 &= ~0x1f;
	bf5xx_tdm.rcr2 &= ~0x1f;
	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S32_LE:
	bf5xx_tdm.tcr2 \|= 31;
	bf5xx_tdm.rcr2 \|= 31;
	sport_handle->wdsize = 4;
	break;
	/* at present, we only support 32bit transfer */
	default:
	pr_err("not supported PCM format yet\n");
	return -EINVAL;
	break;
	}

	if (!bf5xx_tdm.configured) {
	/*
	* TX and RX are not independent,they are enabled at the
	* same time, even if only one side is running. So, we
	* need to configure both of them at the time when the first
	* stream is opened.
	*
	* CPU DAI:slave mode.
	*/
	ret = sport_config_rx(sport_handle, bf5xx_tdm.rcr1,
	bf5xx_tdm.rcr2, 0, 0);
	if (ret) {
	pr_err("SPORT is busy!\n");
	return -EBUSY;
	}

	ret = sport_config_tx(sport_handle, bf5xx_tdm.tcr1,
	bf5xx_tdm.tcr2, 0, 0);
	if (ret) {
	pr_err("SPORT is busy!\n");
	return -EBUSY;
	}

	bf5xx_tdm.configured = 1;
	}

	return 0;
	}

	static void bf5xx_tdm_shutdown(struct snd_pcm_substream *substream,
	struct snd_soc_dai *dai)
	{
	/* No active stream, SPORT is allowed to be configured again. */
	if (!dai->active)
	bf5xx_tdm.configured = 0;
	}

	static int bf5xx_tdm_set_channel_map(struct snd_soc_dai *dai,
	unsigned int tx_num, unsigned int *tx_slot,
	unsigned int rx_num, unsigned int *rx_slot)
	{
	int i;
	unsigned int slot;
	unsigned int tx_mapped = 0, rx_mapped = 0;

	if ((tx_num > BFIN_TDM_DAI_MAX_SLOTS) \|\|
	(rx_num > BFIN_TDM_DAI_MAX_SLOTS))
	return -EINVAL;

	for (i = 0; i < tx_num; i++) {
	slot = tx_slot[i];
	if ((slot < BFIN_TDM_DAI_MAX_SLOTS) &&
	(!(tx_mapped & (1 << slot)))) {
	bf5xx_tdm.tx_map[i] = slot;
	tx_mapped \|= 1 << slot;
	} else
	return -EINVAL;
	}
	for (i = 0; i < rx_num; i++) {
	slot = rx_slot[i];
	if ((slot < BFIN_TDM_DAI_MAX_SLOTS) &&
	(!(rx_mapped & (1 << slot)))) {
	bf5xx_tdm.rx_map[i] = slot;
	rx_mapped \|= 1 << slot;
	} else
	return -EINVAL;
	}

	return 0;
	}

	#ifdef CONFIG_PM
	static int bf5xx_tdm_suspend(struct snd_soc_dai *dai)
	{
	struct sport_device *sport =
	(struct sport_device *)dai->private_data;

	if (!dai->active)
	return 0;
	if (dai->capture.active)
	sport_rx_stop(sport);
	if (dai->playback.active)
	sport_tx_stop(sport);
	return 0;
	}

	static int bf5xx_tdm_resume(struct snd_soc_dai *dai)
	{
	int ret;
	struct sport_device *sport =
	(struct sport_device *)dai->private_data;

	if (!dai->active)
	return 0;

	ret = sport_set_multichannel(sport, 8, 0xFF, 1);
	if (ret) {
	pr_err("SPORT is busy!\n");
	ret = -EBUSY;
	}

	ret = sport_config_rx(sport, IRFS, 0x1F, 0, 0);
	if (ret) {
	pr_err("SPORT is busy!\n");
	ret = -EBUSY;
	}

	ret = sport_config_tx(sport, ITFS, 0x1F, 0, 0);
	if (ret) {
	pr_err("SPORT is busy!\n");
	ret = -EBUSY;
	}

	return 0;
	}

	#else
	#define bf5xx_tdm_suspend NULL
	#define bf5xx_tdm_resume NULL
	#endif

	static struct snd_soc_dai_ops bf5xx_tdm_dai_ops = {
	.hw_params = bf5xx_tdm_hw_params,
	.set_fmt = bf5xx_tdm_set_dai_fmt,
	.shutdown = bf5xx_tdm_shutdown,
	.set_channel_map = bf5xx_tdm_set_channel_map,
	};

	struct snd_soc_dai bf5xx_tdm_dai = {
	.name = "bf5xx-tdm",
	.id = 0,
	.suspend = bf5xx_tdm_suspend,
	.resume = bf5xx_tdm_resume,
	.playback = {
	.channels_min = 2,
	.channels_max = 8,
	.rates = SNDRV_PCM_RATE_48000,
	.formats = SNDRV_PCM_FMTBIT_S32_LE,},
	.capture = {
	.channels_min = 2,
	.channels_max = 8,
	.rates = SNDRV_PCM_RATE_48000,
	.formats = SNDRV_PCM_FMTBIT_S32_LE,},
	.ops = &bf5xx_tdm_dai_ops,
	};
	EXPORT_SYMBOL_GPL(bf5xx_tdm_dai);

	static int __devinit bfin_tdm_probe(struct platform_device *pdev)
	{
	int ret = 0;

	if (peripheral_request_list(&sport_req[sport_num][0], "soc-audio")) {
	pr_err("Requesting Peripherals failed\n");
	return -EFAULT;
	}

	/* request DMA for SPORT */
	sport_handle = sport_init(&sport_params[sport_num], 4, \
	8 * sizeof(u32), NULL);
	if (!sport_handle) {
	peripheral_free_list(&sport_req[sport_num][0]);
	return -ENODEV;
	}

	/* SPORT works in TDM mode */
	ret = sport_set_multichannel(sport_handle, 8, 0xFF, 1);
	if (ret) {
	pr_err("SPORT is busy!\n");
	ret = -EBUSY;
	goto sport_config_err;
	}

	ret = sport_config_rx(sport_handle, IRFS, 0x1F, 0, 0);
	if (ret) {
	pr_err("SPORT is busy!\n");
	ret = -EBUSY;
	goto sport_config_err;
	}

	ret = sport_config_tx(sport_handle, ITFS, 0x1F, 0, 0);
	if (ret) {
	pr_err("SPORT is busy!\n");
	ret = -EBUSY;
	goto sport_config_err;
	}

	ret = snd_soc_register_dai(&bf5xx_tdm_dai);
	if (ret) {
	pr_err("Failed to register DAI: %d\n", ret);
	goto sport_config_err;
	}

	sport_handle->private_data = &bf5xx_tdm;
	return 0;

	sport_config_err:
	peripheral_free_list(&sport_req[sport_num][0]);
	return ret;
	}

	static int __devexit bfin_tdm_remove(struct platform_device *pdev)
	{
	peripheral_free_list(&sport_req[sport_num][0]);
	snd_soc_unregister_dai(&bf5xx_tdm_dai);

	return 0;
	}

	static struct platform_driver bfin_tdm_driver = {
	.probe = bfin_tdm_probe,
	.remove = __devexit_p(bfin_tdm_remove),
	.driver = {
	.name = "bfin-tdm",
	.owner = THIS_MODULE,
	},
	};

	static int __init bfin_tdm_init(void)
	{
	return platform_driver_register(&bfin_tdm_driver);
	}
	module_init(bfin_tdm_init);

	static void __exit bfin_tdm_exit(void)
	{
	platform_driver_unregister(&bfin_tdm_driver);
	}
	module_exit(bfin_tdm_exit);

	/* Module information */
	MODULE_AUTHOR("Barry Song");
	MODULE_DESCRIPTION("TDM driver for ADI Blackfin");
	MODULE_LICENSE("GPL");