[deliverable/linux.git] / sound / soc / tegra / tegra_spdif.c

/*
 * tegra_spdif.c - Tegra SPDIF driver
 *
 * Author: Stephen Warren <swarren@nvidia.com>
 * Copyright (C) 2011 - NVIDIA, Inc.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 * 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 St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 */

#include <linux/clk.h>
#include <linux/module.h>
#include <linux/debugfs.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <mach/iomap.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>

#include "tegra_spdif.h"

#define DRV_NAME "tegra-spdif"

static inline void tegra_spdif_write(struct tegra_spdif *spdif, u32 reg,
					u32 val)
{
	__raw_writel(val, spdif->regs + reg);
}

static inline u32 tegra_spdif_read(struct tegra_spdif *spdif, u32 reg)
{
	return __raw_readl(spdif->regs + reg);
}

#ifdef CONFIG_DEBUG_FS
static int tegra_spdif_show(struct seq_file *s, void *unused)
{
#define REG(r) { r, #r }
	static const struct {
		int offset;
		const char *name;
	} regs[] = {
		REG(TEGRA_SPDIF_CTRL),
		REG(TEGRA_SPDIF_STATUS),
		REG(TEGRA_SPDIF_STROBE_CTRL),
		REG(TEGRA_SPDIF_DATA_FIFO_CSR),
		REG(TEGRA_SPDIF_CH_STA_RX_A),
		REG(TEGRA_SPDIF_CH_STA_RX_B),
		REG(TEGRA_SPDIF_CH_STA_RX_C),
		REG(TEGRA_SPDIF_CH_STA_RX_D),
		REG(TEGRA_SPDIF_CH_STA_RX_E),
		REG(TEGRA_SPDIF_CH_STA_RX_F),
		REG(TEGRA_SPDIF_CH_STA_TX_A),
		REG(TEGRA_SPDIF_CH_STA_TX_B),
		REG(TEGRA_SPDIF_CH_STA_TX_C),
		REG(TEGRA_SPDIF_CH_STA_TX_D),
		REG(TEGRA_SPDIF_CH_STA_TX_E),
		REG(TEGRA_SPDIF_CH_STA_TX_F),
	};
#undef REG

	struct tegra_spdif *spdif = s->private;
	int i;

	for (i = 0; i < ARRAY_SIZE(regs); i++) {
		u32 val = tegra_spdif_read(spdif, regs[i].offset);
		seq_printf(s, "%s = %08x\n", regs[i].name, val);
	}

	return 0;
}

static int tegra_spdif_debug_open(struct inode *inode, struct file *file)
{
	return single_open(file, tegra_spdif_show, inode->i_private);
}

static const struct file_operations tegra_spdif_debug_fops = {
	.open    = tegra_spdif_debug_open,
	.read    = seq_read,
	.llseek  = seq_lseek,
	.release = single_release,
};

static void tegra_spdif_debug_add(struct tegra_spdif *spdif)
{
	spdif->debug = debugfs_create_file(DRV_NAME, S_IRUGO,
						snd_soc_debugfs_root, spdif,
						&tegra_spdif_debug_fops);
}

static void tegra_spdif_debug_remove(struct tegra_spdif *spdif)
{
	if (spdif->debug)
		debugfs_remove(spdif->debug);
}
#else
static inline void tegra_spdif_debug_add(struct tegra_spdif *spdif)
{
}

static inline void tegra_spdif_debug_remove(struct tegra_spdif *spdif)
{
}
#endif

static int tegra_spdif_hw_params(struct snd_pcm_substream *substream,
				struct snd_pcm_hw_params *params,
				struct snd_soc_dai *dai)
{
	struct device *dev = substream->pcm->card->dev;
	struct tegra_spdif *spdif = snd_soc_dai_get_drvdata(dai);
	int ret, srate, spdifclock;

	spdif->reg_ctrl &= ~TEGRA_SPDIF_CTRL_PACK;
	spdif->reg_ctrl &= ~TEGRA_SPDIF_CTRL_BIT_MODE_MASK;
	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S16_LE:
		spdif->reg_ctrl |= TEGRA_SPDIF_CTRL_PACK;
		spdif->reg_ctrl |= TEGRA_SPDIF_CTRL_BIT_MODE_16BIT;
		break;
	default:
		return -EINVAL;
	}

	srate = params_rate(params);
	switch (params_rate(params)) {
	case 32000:
		spdifclock = 4096000;
		break;
	case 44100:
		spdifclock = 5644800;
		break;
	case 48000:
		spdifclock = 6144000;
		break;
	case 88200:
		spdifclock = 11289600;
		break;
	case 96000:
		spdifclock = 12288000;
		break;
	case 176400:
		spdifclock = 22579200;
		break;
	case 192000:
		spdifclock = 24576000;
		break;
	default:
		return -EINVAL;
	}

	ret = clk_set_rate(spdif->clk_spdif_out, spdifclock);
	if (ret) {
		dev_err(dev, "Can't set SPDIF clock rate: %d\n", ret);
		return ret;
	}

	return 0;
}

static void tegra_spdif_start_playback(struct tegra_spdif *spdif)
{
	spdif->reg_ctrl |= TEGRA_SPDIF_CTRL_TX_EN;
	tegra_spdif_write(spdif, TEGRA_SPDIF_CTRL, spdif->reg_ctrl);
}

static void tegra_spdif_stop_playback(struct tegra_spdif *spdif)
{
	spdif->reg_ctrl &= ~TEGRA_SPDIF_CTRL_TX_EN;
	tegra_spdif_write(spdif, TEGRA_SPDIF_CTRL, spdif->reg_ctrl);
}

static int tegra_spdif_trigger(struct snd_pcm_substream *substream, int cmd,
				struct snd_soc_dai *dai)
{
	struct tegra_spdif *spdif = snd_soc_dai_get_drvdata(dai);

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	case SNDRV_PCM_TRIGGER_RESUME:
		if (!spdif->clk_refs)
			clk_enable(spdif->clk_spdif_out);
		spdif->clk_refs++;
		tegra_spdif_start_playback(spdif);
		break;
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	case SNDRV_PCM_TRIGGER_SUSPEND:
		tegra_spdif_stop_playback(spdif);
		spdif->clk_refs--;
		if (!spdif->clk_refs)
			clk_disable(spdif->clk_spdif_out);
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static int tegra_spdif_probe(struct snd_soc_dai *dai)
{
	struct tegra_spdif *spdif = snd_soc_dai_get_drvdata(dai);

	dai->capture_dma_data = NULL;
	dai->playback_dma_data = &spdif->playback_dma_data;

	return 0;
}

static struct snd_soc_dai_ops tegra_spdif_dai_ops = {
	.hw_params	= tegra_spdif_hw_params,
	.trigger	= tegra_spdif_trigger,
};

struct snd_soc_dai_driver tegra_spdif_dai = {
	.name = DRV_NAME,
	.probe = tegra_spdif_probe,
	.playback = {
		.channels_min = 2,
		.channels_max = 2,
		.rates = SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
				SNDRV_PCM_RATE_48000,
		.formats = SNDRV_PCM_FMTBIT_S16_LE,
	},
	.ops = &tegra_spdif_dai_ops,
};

static __devinit int tegra_spdif_platform_probe(struct platform_device *pdev)
{
	struct tegra_spdif *spdif;
	struct resource *mem, *memregion, *dmareq;
	int ret;

	spdif = kzalloc(sizeof(struct tegra_spdif), GFP_KERNEL);
	if (!spdif) {
		dev_err(&pdev->dev, "Can't allocate tegra_spdif\n");
		ret = -ENOMEM;
		goto exit;
	}
	dev_set_drvdata(&pdev->dev, spdif);

	spdif->clk_spdif_out = clk_get(&pdev->dev, "spdif_out");
	if (IS_ERR(spdif->clk_spdif_out)) {
		pr_err("Can't retrieve spdif clock\n");
		ret = PTR_ERR(spdif->clk_spdif_out);
		goto err_free;
	}

	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!mem) {
		dev_err(&pdev->dev, "No memory resource\n");
		ret = -ENODEV;
		goto err_clk_put;
	}

	dmareq = platform_get_resource(pdev, IORESOURCE_DMA, 0);
	if (!dmareq) {
		dev_err(&pdev->dev, "No DMA resource\n");
		ret = -ENODEV;
		goto err_clk_put;
	}

	memregion = request_mem_region(mem->start, resource_size(mem),
					DRV_NAME);
	if (!memregion) {
		dev_err(&pdev->dev, "Memory region already claimed\n");
		ret = -EBUSY;
		goto err_clk_put;
	}

	spdif->regs = ioremap(mem->start, resource_size(mem));
	if (!spdif->regs) {
		dev_err(&pdev->dev, "ioremap failed\n");
		ret = -ENOMEM;
		goto err_release;
	}

	spdif->playback_dma_data.addr = mem->start + TEGRA_SPDIF_DATA_OUT;
	spdif->playback_dma_data.wrap = 4;
	spdif->playback_dma_data.width = 32;
	spdif->playback_dma_data.req_sel = dmareq->start;

	ret = snd_soc_register_dai(&pdev->dev, &tegra_spdif_dai);
	if (ret) {
		dev_err(&pdev->dev, "Could not register DAI: %d\n", ret);
		ret = -ENOMEM;
		goto err_unmap;
	}

	tegra_spdif_debug_add(spdif);

	return 0;

err_unmap:
	iounmap(spdif->regs);
err_release:
	release_mem_region(mem->start, resource_size(mem));
err_clk_put:
	clk_put(spdif->clk_spdif_out);
err_free:
	kfree(spdif);
exit:
	return ret;
}

static int __devexit tegra_spdif_platform_remove(struct platform_device *pdev)
{
	struct tegra_spdif *spdif = dev_get_drvdata(&pdev->dev);
	struct resource *res;

	snd_soc_unregister_dai(&pdev->dev);

	tegra_spdif_debug_remove(spdif);

	iounmap(spdif->regs);

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	release_mem_region(res->start, resource_size(res));

	clk_put(spdif->clk_spdif_out);

	kfree(spdif);

	return 0;
}

static struct platform_driver tegra_spdif_driver = {
	.driver = {
		.name = DRV_NAME,
		.owner = THIS_MODULE,
	},
	.probe = tegra_spdif_platform_probe,
	.remove = __devexit_p(tegra_spdif_platform_remove),
};

static int __init snd_tegra_spdif_init(void)
{
	return platform_driver_register(&tegra_spdif_driver);
}
module_init(snd_tegra_spdif_init);

static void __exit snd_tegra_spdif_exit(void)
{
	platform_driver_unregister(&tegra_spdif_driver);
}
module_exit(snd_tegra_spdif_exit);

MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
MODULE_DESCRIPTION("Tegra SPDIF ASoC driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:" DRV_NAME);
Commit	Line	Data
774fec33 SW	1	/*
	2	* tegra_spdif.c - Tegra SPDIF driver
	3	*
	4	* Author: Stephen Warren <swarren@nvidia.com>
	5	* Copyright (C) 2011 - NVIDIA, Inc.
	6	*
	7	* This program is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU General Public License
	9	* version 2 as published by the Free Software Foundation.
	10	*
	11	* This program is distributed in the hope that it will be useful, but
	12	* WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	14	* General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
	19	* 02110-1301 USA
	20	*
	21	*/
	22
	23	#include <linux/clk.h>
	24	#include <linux/module.h>
	25	#include <linux/debugfs.h>
	26	#include <linux/device.h>
	27	#include <linux/platform_device.h>
	28	#include <linux/seq_file.h>
	29	#include <linux/slab.h>
	30	#include <linux/io.h>
	31	#include <mach/iomap.h>
	32	#include <sound/core.h>
	33	#include <sound/pcm.h>
	34	#include <sound/pcm_params.h>
	35	#include <sound/soc.h>
	36
	37	#include "tegra_spdif.h"
	38
	39	#define DRV_NAME "tegra-spdif"
	40
	41	static inline void tegra_spdif_write(struct tegra_spdif *spdif, u32 reg,
	42	u32 val)
	43	{
	44	__raw_writel(val, spdif->regs + reg);
	45	}
	46
	47	static inline u32 tegra_spdif_read(struct tegra_spdif *spdif, u32 reg)
	48	{
	49	return __raw_readl(spdif->regs + reg);
	50	}
	51
	52	#ifdef CONFIG_DEBUG_FS
	53	static int tegra_spdif_show(struct seq_file s, void unused)
	54	{
	55	#define REG(r) { r, #r }
	56	static const struct {
	57	int offset;
	58	const char *name;
	59	} regs[] = {
	60	REG(TEGRA_SPDIF_CTRL),
	61	REG(TEGRA_SPDIF_STATUS),
	62	REG(TEGRA_SPDIF_STROBE_CTRL),
	63	REG(TEGRA_SPDIF_DATA_FIFO_CSR),
	64	REG(TEGRA_SPDIF_CH_STA_RX_A),
65	REG(TEGRA_SPDIF_CH_STA_RX_B),
66	REG(TEGRA_SPDIF_CH_STA_RX_C),
67	REG(TEGRA_SPDIF_CH_STA_RX_D),
68	REG(TEGRA_SPDIF_CH_STA_RX_E),
69	REG(TEGRA_SPDIF_CH_STA_RX_F),
70	REG(TEGRA_SPDIF_CH_STA_TX_A),
71	REG(TEGRA_SPDIF_CH_STA_TX_B),
72	REG(TEGRA_SPDIF_CH_STA_TX_C),
73	REG(TEGRA_SPDIF_CH_STA_TX_D),
74	REG(TEGRA_SPDIF_CH_STA_TX_E),
75	REG(TEGRA_SPDIF_CH_STA_TX_F),
76	};
77	#undef REG
78
79	struct tegra_spdif *spdif = s->private;
80	int i;
81
82	for (i = 0; i < ARRAY_SIZE(regs); i++) {
83	u32 val = tegra_spdif_read(spdif, regs[i].offset);
84	seq_printf(s, "%s = %08x\n", regs[i].name, val);
85	}
86
87	return 0;
88	}
89
90	static int tegra_spdif_debug_open(struct inode inode, struct file file)
91	{
92	return single_open(file, tegra_spdif_show, inode->i_private);
93	}
94
95	static const struct file_operations tegra_spdif_debug_fops = {
96	.open = tegra_spdif_debug_open,
97	.read = seq_read,
98	.llseek = seq_lseek,
99	.release = single_release,
100	};
101
102	static void tegra_spdif_debug_add(struct tegra_spdif *spdif)
103	{
104	spdif->debug = debugfs_create_file(DRV_NAME, S_IRUGO,
105	snd_soc_debugfs_root, spdif,
106	&tegra_spdif_debug_fops);
107	}
108
109	static void tegra_spdif_debug_remove(struct tegra_spdif *spdif)
110	{
111	if (spdif->debug)
112	debugfs_remove(spdif->debug);
113	}
114	#else
115	static inline void tegra_spdif_debug_add(struct tegra_spdif *spdif)
116	{
117	}
118
119	static inline void tegra_spdif_debug_remove(struct tegra_spdif *spdif)
120	{
121	}
122	#endif
123
124	static int tegra_spdif_hw_params(struct snd_pcm_substream *substream,
125	struct snd_pcm_hw_params *params,
126	struct snd_soc_dai *dai)
127	{
128	struct device *dev = substream->pcm->card->dev;
129	struct tegra_spdif *spdif = snd_soc_dai_get_drvdata(dai);
130	int ret, srate, spdifclock;
131
132	spdif->reg_ctrl &= ~TEGRA_SPDIF_CTRL_PACK;
133	spdif->reg_ctrl &= ~TEGRA_SPDIF_CTRL_BIT_MODE_MASK;
134	switch (params_format(params)) {
135	case SNDRV_PCM_FORMAT_S16_LE:
136	spdif->reg_ctrl \|= TEGRA_SPDIF_CTRL_PACK;
137	spdif->reg_ctrl \|= TEGRA_SPDIF_CTRL_BIT_MODE_16BIT;
138	break;
139	default:
140	return -EINVAL;
141	}
142
143	srate = params_rate(params);
144	switch (params_rate(params)) {
145	case 32000:
146	spdifclock = 4096000;
147	break;
148	case 44100:
149	spdifclock = 5644800;
150	break;
151	case 48000:
152	spdifclock = 6144000;
153	break;
154	case 88200:
155	spdifclock = 11289600;
156	break;
157	case 96000:
158	spdifclock = 12288000;
159	break;
160	case 176400:
161	spdifclock = 22579200;
162	break;
163	case 192000:
164	spdifclock = 24576000;
165	break;
166	default:
167	return -EINVAL;
168	}
169
170	ret = clk_set_rate(spdif->clk_spdif_out, spdifclock);
171	if (ret) {
172	dev_err(dev, "Can't set SPDIF clock rate: %d\n", ret);
173	return ret;
174	}
175
176	return 0;
177	}
178
179	static void tegra_spdif_start_playback(struct tegra_spdif *spdif)
180	{
181	spdif->reg_ctrl \|= TEGRA_SPDIF_CTRL_TX_EN;
182	tegra_spdif_write(spdif, TEGRA_SPDIF_CTRL, spdif->reg_ctrl);
183	}
184
185	static void tegra_spdif_stop_playback(struct tegra_spdif *spdif)
186	{
187	spdif->reg_ctrl &= ~TEGRA_SPDIF_CTRL_TX_EN;
188	tegra_spdif_write(spdif, TEGRA_SPDIF_CTRL, spdif->reg_ctrl);
189	}
190
191	static int tegra_spdif_trigger(struct snd_pcm_substream *substream, int cmd,
192	struct snd_soc_dai *dai)
193	{
194	struct tegra_spdif *spdif = snd_soc_dai_get_drvdata(dai);
195
196	switch (cmd) {
197	case SNDRV_PCM_TRIGGER_START:
198	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
199	case SNDRV_PCM_TRIGGER_RESUME:
200	if (!spdif->clk_refs)
201	clk_enable(spdif->clk_spdif_out);
202	spdif->clk_refs++;
203	tegra_spdif_start_playback(spdif);
204	break;
205	case SNDRV_PCM_TRIGGER_STOP:
206	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
207	case SNDRV_PCM_TRIGGER_SUSPEND:
208	tegra_spdif_stop_playback(spdif);
209	spdif->clk_refs--;
210	if (!spdif->clk_refs)
211	clk_disable(spdif->clk_spdif_out);
212	break;
213	default:
214	return -EINVAL;
215	}
216
217	return 0;
218	}
219
220	static int tegra_spdif_probe(struct snd_soc_dai *dai)
221	{
222	struct tegra_spdif *spdif = snd_soc_dai_get_drvdata(dai);
223
224	dai->capture_dma_data = NULL;
225	dai->playback_dma_data = &spdif->playback_dma_data;
226
227	return 0;
228	}
229
230	static struct snd_soc_dai_ops tegra_spdif_dai_ops = {
231	.hw_params = tegra_spdif_hw_params,
232	.trigger = tegra_spdif_trigger,
233	};
234
235	struct snd_soc_dai_driver tegra_spdif_dai = {
236	.name = DRV_NAME,
237	.probe = tegra_spdif_probe,
238	.playback = {
239	.channels_min = 2,
240	.channels_max = 2,
241	.rates = SNDRV_PCM_RATE_32000 \| SNDRV_PCM_RATE_44100 \|
242	SNDRV_PCM_RATE_48000,
243	.formats = SNDRV_PCM_FMTBIT_S16_LE,
244	},
245	.ops = &tegra_spdif_dai_ops,
246	};
247
248	static __devinit int tegra_spdif_platform_probe(struct platform_device *pdev)
249	{
250	struct tegra_spdif *spdif;
251	struct resource mem, memregion, *dmareq;
252	int ret;
253
254	spdif = kzalloc(sizeof(struct tegra_spdif), GFP_KERNEL);
255	if (!spdif) {
256	dev_err(&pdev->dev, "Can't allocate tegra_spdif\n");
257	ret = -ENOMEM;
258	goto exit;
259	}
260	dev_set_drvdata(&pdev->dev, spdif);
261
262	spdif->clk_spdif_out = clk_get(&pdev->dev, "spdif_out");
263	if (IS_ERR(spdif->clk_spdif_out)) {
264	pr_err("Can't retrieve spdif clock\n");
265	ret = PTR_ERR(spdif->clk_spdif_out);
266	goto err_free;
267	}
268
269	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
270	if (!mem) {
271	dev_err(&pdev->dev, "No memory resource\n");
272	ret = -ENODEV;
273	goto err_clk_put;
274	}
275
276	dmareq = platform_get_resource(pdev, IORESOURCE_DMA, 0);
277	if (!dmareq) {
278	dev_err(&pdev->dev, "No DMA resource\n");
279	ret = -ENODEV;
280	goto err_clk_put;
281	}
282
283	memregion = request_mem_region(mem->start, resource_size(mem),
284	DRV_NAME);
285	if (!memregion) {
286	dev_err(&pdev->dev, "Memory region already claimed\n");
287	ret = -EBUSY;
288	goto err_clk_put;
289	}
290
291	spdif->regs = ioremap(mem->start, resource_size(mem));
292	if (!spdif->regs) {
293	dev_err(&pdev->dev, "ioremap failed\n");
294	ret = -ENOMEM;
295	goto err_release;
296	}
297
298	spdif->playback_dma_data.addr = mem->start + TEGRA_SPDIF_DATA_OUT;
299	spdif->playback_dma_data.wrap = 4;
300	spdif->playback_dma_data.width = 32;
301	spdif->playback_dma_data.req_sel = dmareq->start;
302
303	ret = snd_soc_register_dai(&pdev->dev, &tegra_spdif_dai);
304	if (ret) {
305	dev_err(&pdev->dev, "Could not register DAI: %d\n", ret);
306	ret = -ENOMEM;
307	goto err_unmap;
308	}
309
310	tegra_spdif_debug_add(spdif);
311
312	return 0;
313
314	err_unmap:
315	iounmap(spdif->regs);
316	err_release:
317	release_mem_region(mem->start, resource_size(mem));
318	err_clk_put:
319	clk_put(spdif->clk_spdif_out);
320	err_free:
321	kfree(spdif);
322	exit:
323	return ret;
324	}
325
326	static int __devexit tegra_spdif_platform_remove(struct platform_device *pdev)
327	{
328	struct tegra_spdif *spdif = dev_get_drvdata(&pdev->dev);
329	struct resource *res;
330
331	snd_soc_unregister_dai(&pdev->dev);
332
333	tegra_spdif_debug_remove(spdif);
334
335	iounmap(spdif->regs);
336
337	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
338	release_mem_region(res->start, resource_size(res));
339
340	clk_put(spdif->clk_spdif_out);
341
342	kfree(spdif);
343
344	return 0;
345	}
346
347	static struct platform_driver tegra_spdif_driver = {
348	.driver = {
349	.name = DRV_NAME,
350	.owner = THIS_MODULE,
351	},
352	.probe = tegra_spdif_platform_probe,
353	.remove = __devexit_p(tegra_spdif_platform_remove),
354	};
355
356	static int __init snd_tegra_spdif_init(void)
357	{
358	return platform_driver_register(&tegra_spdif_driver);
359	}
360	module_init(snd_tegra_spdif_init);
361
362	static void __exit snd_tegra_spdif_exit(void)
363	{
364	platform_driver_unregister(&tegra_spdif_driver);
365	}
366	module_exit(snd_tegra_spdif_exit);
367
368	MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
369	MODULE_DESCRIPTION("Tegra SPDIF ASoC driver");
370	MODULE_LICENSE("GPL");
371	MODULE_ALIAS("platform:" DRV_NAME);