[deliverable/linux.git] / sound / soc / sti / uniperif_reader.c

/*
 * Copyright (C) STMicroelectronics SA 2015
 * Authors: Arnaud Pouliquen <arnaud.pouliquen@st.com>
 *          for STMicroelectronics.
 * License terms:  GNU General Public License (GPL), version 2
 */

#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/io.h>

#include <sound/soc.h>

#include "uniperif.h"

/*
 * Note: snd_pcm_hardware is linked to DMA controller but is declared here to
 * integrate unireader capability in term of rate and supported channels
 */
static const struct snd_pcm_hardware uni_reader_pcm_hw = {
	.info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
		SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_MMAP |
		SNDRV_PCM_INFO_MMAP_VALID,
	.formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S16_LE,

	.rates = SNDRV_PCM_RATE_CONTINUOUS,
	.rate_min = 8000,
	.rate_max = 96000,

	.channels_min = 2,
	.channels_max = 8,

	.periods_min = 2,
	.periods_max = 48,

	.period_bytes_min = 128,
	.period_bytes_max = 64 * PAGE_SIZE,
	.buffer_bytes_max = 256 * PAGE_SIZE
};

/*
 * uni_reader_irq_handler
 * In case of error audio stream is stopped; stop action is protected via PCM
 * stream lock  to avoid race condition with trigger callback.
 */
static irqreturn_t uni_reader_irq_handler(int irq, void *dev_id)
{
	irqreturn_t ret = IRQ_NONE;
	struct uniperif *reader = dev_id;
	unsigned int status;

	if (reader->state == UNIPERIF_STATE_STOPPED) {
		/* Unexpected IRQ: do nothing */
		dev_warn(reader->dev, "unexpected IRQ ");
		return IRQ_HANDLED;
	}

	/* Get interrupt status & clear them immediately */
	status = GET_UNIPERIF_ITS(reader);
	SET_UNIPERIF_ITS_BCLR(reader, status);

	/* Check for fifo overflow error */
	if (unlikely(status & UNIPERIF_ITS_FIFO_ERROR_MASK(reader))) {
		dev_err(reader->dev, "FIFO error detected");

		snd_pcm_stream_lock(reader->substream);
		snd_pcm_stop(reader->substream, SNDRV_PCM_STATE_XRUN);
		snd_pcm_stream_unlock(reader->substream);

		return IRQ_HANDLED;
	}

	return ret;
}

static int uni_reader_prepare(struct snd_pcm_substream *substream,
			      struct snd_soc_dai *dai)
{
	struct sti_uniperiph_data *priv = snd_soc_dai_get_drvdata(dai);
	struct uniperif *reader = priv->dai_data.uni;
	struct snd_pcm_runtime *runtime = substream->runtime;
	int transfer_size, trigger_limit;
	int slot_width;
	int count = 10;

	/* The reader should be stopped */
	if (reader->state != UNIPERIF_STATE_STOPPED) {
		dev_err(reader->dev, "%s: invalid reader state %d", __func__,
			reader->state);
		return -EINVAL;
	}

	/* Calculate transfer size (in fifo cells and bytes) for frame count */
	transfer_size = runtime->channels * UNIPERIF_FIFO_FRAMES;

	/* Calculate number of empty cells available before asserting DREQ */
	if (reader->ver < SND_ST_UNIPERIF_VERSION_UNI_PLR_TOP_1_0)
		trigger_limit = UNIPERIF_FIFO_SIZE - transfer_size;
	else
		/*
		 * Since SND_ST_UNIPERIF_VERSION_UNI_PLR_TOP_1_0
		 * FDMA_TRIGGER_LIMIT also controls when the state switches
		 * from OFF or STANDBY to AUDIO DATA.
		 */
		trigger_limit = transfer_size;

	/* Trigger limit must be an even number */
	if ((!trigger_limit % 2) ||
	    (trigger_limit != 1 && transfer_size % 2) ||
	    (trigger_limit > UNIPERIF_CONFIG_DMA_TRIG_LIMIT_MASK(reader))) {
		dev_err(reader->dev, "invalid trigger limit %d", trigger_limit);
		return -EINVAL;
	}

	SET_UNIPERIF_CONFIG_DMA_TRIG_LIMIT(reader, trigger_limit);

	switch (reader->daifmt & SND_SOC_DAIFMT_INV_MASK) {
	case SND_SOC_DAIFMT_IB_IF:
	case SND_SOC_DAIFMT_NB_IF:
		SET_UNIPERIF_I2S_FMT_LR_POL_HIG(reader);
		break;
	default:
		SET_UNIPERIF_I2S_FMT_LR_POL_LOW(reader);
	}

	/* Force slot width to 32 in I2S mode */
	if ((reader->daifmt & SND_SOC_DAIFMT_FORMAT_MASK)
		== SND_SOC_DAIFMT_I2S) {
		slot_width = 32;
	} else {
		switch (runtime->format) {
		case SNDRV_PCM_FORMAT_S16_LE:
			slot_width = 16;
			break;
		default:
			slot_width = 32;
			break;
		}
	}

	/* Number of bits per subframe (i.e one channel sample) on input. */
	switch (slot_width) {
	case 32:
		SET_UNIPERIF_I2S_FMT_NBIT_32(reader);
		SET_UNIPERIF_I2S_FMT_DATA_SIZE_32(reader);
		break;
	case 16:
		SET_UNIPERIF_I2S_FMT_NBIT_16(reader);
		SET_UNIPERIF_I2S_FMT_DATA_SIZE_16(reader);
		break;
	default:
		dev_err(reader->dev, "subframe format not supported");
		return -EINVAL;
	}

	/* Configure data memory format */
	switch (runtime->format) {
	case SNDRV_PCM_FORMAT_S16_LE:
		/* One data word contains two samples */
		SET_UNIPERIF_CONFIG_MEM_FMT_16_16(reader);
		break;

	case SNDRV_PCM_FORMAT_S32_LE:
		/*
		 * Actually "16 bits/0 bits" means "32/28/24/20/18/16 bits
		 * on the MSB then zeros (if less than 32 bytes)"...
		 */
		SET_UNIPERIF_CONFIG_MEM_FMT_16_0(reader);
		break;

	default:
		dev_err(reader->dev, "format not supported");
		return -EINVAL;
	}

	switch (reader->daifmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_I2S:
		SET_UNIPERIF_I2S_FMT_ALIGN_LEFT(reader);
		SET_UNIPERIF_I2S_FMT_PADDING_I2S_MODE(reader);
		break;
	case SND_SOC_DAIFMT_LEFT_J:
		SET_UNIPERIF_I2S_FMT_ALIGN_LEFT(reader);
		SET_UNIPERIF_I2S_FMT_PADDING_SONY_MODE(reader);
		break;
	case SND_SOC_DAIFMT_RIGHT_J:
		SET_UNIPERIF_I2S_FMT_ALIGN_RIGHT(reader);
		SET_UNIPERIF_I2S_FMT_PADDING_SONY_MODE(reader);
		break;
	default:
		dev_err(reader->dev, "format not supported");
		return -EINVAL;
	}

	SET_UNIPERIF_I2S_FMT_ORDER_MSB(reader);

	/* Data clocking (changing) on the rising edge */
	SET_UNIPERIF_I2S_FMT_SCLK_EDGE_RISING(reader);

	/* Number of channels must be even */

	if ((runtime->channels % 2) || (runtime->channels < 2) ||
	    (runtime->channels > 10)) {
		dev_err(reader->dev, "%s: invalid nb of channels", __func__);
		return -EINVAL;
	}

	SET_UNIPERIF_I2S_FMT_NUM_CH(reader, runtime->channels / 2);

	/* Clear any pending interrupts */
	SET_UNIPERIF_ITS_BCLR(reader, GET_UNIPERIF_ITS(reader));

	SET_UNIPERIF_I2S_FMT_NO_OF_SAMPLES_TO_READ(reader, 0);

	/* Set the interrupt mask */
	SET_UNIPERIF_ITM_BSET_DMA_ERROR(reader);
	SET_UNIPERIF_ITM_BSET_FIFO_ERROR(reader);
	SET_UNIPERIF_ITM_BSET_MEM_BLK_READ(reader);

	/* Enable underflow recovery interrupts */
	if (reader->info->underflow_enabled) {
		SET_UNIPERIF_ITM_BSET_UNDERFLOW_REC_DONE(reader);
		SET_UNIPERIF_ITM_BSET_UNDERFLOW_REC_FAILED(reader);
	}

	/* Reset uniperipheral reader */
	SET_UNIPERIF_SOFT_RST_SOFT_RST(reader);

	while (GET_UNIPERIF_SOFT_RST_SOFT_RST(reader)) {
		udelay(5);
		count--;
	}
	if (!count) {
		dev_err(reader->dev, "Failed to reset uniperif");
		return -EIO;
	}

	return 0;
}

static int uni_reader_start(struct uniperif *reader)
{
	/* The reader should be stopped */
	if (reader->state != UNIPERIF_STATE_STOPPED) {
		dev_err(reader->dev, "%s: invalid reader state", __func__);
		return -EINVAL;
	}

	/* Enable reader interrupts (and clear possible stalled ones) */
	SET_UNIPERIF_ITS_BCLR_FIFO_ERROR(reader);
	SET_UNIPERIF_ITM_BSET_FIFO_ERROR(reader);

	/* Launch the reader */
	SET_UNIPERIF_CTRL_OPERATION_PCM_DATA(reader);

	/* Update state to started */
	reader->state = UNIPERIF_STATE_STARTED;
	return 0;
}

static int uni_reader_stop(struct uniperif *reader)
{
	/* The reader should not be in stopped state */
	if (reader->state == UNIPERIF_STATE_STOPPED) {
		dev_err(reader->dev, "%s: invalid reader state", __func__);
		return -EINVAL;
	}

	/* Turn the reader off */
	SET_UNIPERIF_CTRL_OPERATION_OFF(reader);

	/* Disable interrupts */
	SET_UNIPERIF_ITM_BCLR(reader, GET_UNIPERIF_ITM(reader));

	/* Update state to stopped and return */
	reader->state = UNIPERIF_STATE_STOPPED;

	return 0;
}

static int  uni_reader_trigger(struct snd_pcm_substream *substream,
			       int cmd, struct snd_soc_dai *dai)
{
	struct sti_uniperiph_data *priv = snd_soc_dai_get_drvdata(dai);
	struct uniperif *reader = priv->dai_data.uni;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		return  uni_reader_start(reader);
	case SNDRV_PCM_TRIGGER_STOP:
		return  uni_reader_stop(reader);
	default:
		return -EINVAL;
	}
}

static void uni_reader_shutdown(struct snd_pcm_substream *substream,
				struct snd_soc_dai *dai)
{
	struct sti_uniperiph_data *priv = snd_soc_dai_get_drvdata(dai);
	struct uniperif *reader = priv->dai_data.uni;

	if (reader->state != UNIPERIF_STATE_STOPPED) {
		/* Stop the reader */
		uni_reader_stop(reader);
	}
}

static int uni_reader_parse_dt(struct platform_device *pdev,
			       struct uniperif *reader)
{
	struct uniperif_info *info;
	struct device_node *node = pdev->dev.of_node;

	/* Allocate memory for the info structure */
	info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
	if (!info)
		return -ENOMEM;

	if (of_property_read_u32(node, "version", &reader->ver) ||
	    reader->ver == SND_ST_UNIPERIF_VERSION_UNKNOWN) {
		dev_err(&pdev->dev, "Unknown uniperipheral version ");
		return -EINVAL;
	}

	/* Save the info structure */
	reader->info = info;

	return 0;
}

static const struct snd_soc_dai_ops uni_reader_dai_ops = {
		.shutdown = uni_reader_shutdown,
		.prepare = uni_reader_prepare,
		.trigger = uni_reader_trigger,
		.hw_params = sti_uniperiph_dai_hw_params,
		.set_fmt = sti_uniperiph_dai_set_fmt,
};

int uni_reader_init(struct platform_device *pdev,
		    struct uniperif *reader)
{
	int ret = 0;

	reader->dev = &pdev->dev;
	reader->state = UNIPERIF_STATE_STOPPED;
	reader->hw = &uni_reader_pcm_hw;
	reader->dai_ops = &uni_reader_dai_ops;

	dev_err(reader->dev, "%s: enter\n", __func__);
	ret = uni_reader_parse_dt(pdev, reader);
	if (ret < 0) {
		dev_err(reader->dev, "Failed to parse DeviceTree");
		return ret;
	}

	ret = devm_request_irq(&pdev->dev, reader->irq,
			       uni_reader_irq_handler, IRQF_SHARED,
			       dev_name(&pdev->dev), reader);
	if (ret < 0) {
		dev_err(&pdev->dev, "Failed to request IRQ");
		return -EBUSY;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(uni_reader_init);
Commit	Line	Data
c3a0003a AP	1	/*
	2	* Copyright (C) STMicroelectronics SA 2015
	3	* Authors: Arnaud Pouliquen <arnaud.pouliquen@st.com>
	4	* for STMicroelectronics.
	5	* License terms: GNU General Public License (GPL), version 2
	6	*/
	7
	8	#include <linux/clk.h>
	9	#include <linux/delay.h>
	10	#include <linux/io.h>
	11
	12	#include <sound/soc.h>
	13
	14	#include "uniperif.h"
	15
	16	/*
	17	* Note: snd_pcm_hardware is linked to DMA controller but is declared here to
	18	* integrate unireader capability in term of rate and supported channels
	19	*/
f2da4542	20	static const struct snd_pcm_hardware uni_reader_pcm_hw = {
c3a0003a AP	21	.info = SNDRV_PCM_INFO_INTERLEAVED \| SNDRV_PCM_INFO_BLOCK_TRANSFER \|
	22	SNDRV_PCM_INFO_PAUSE \| SNDRV_PCM_INFO_MMAP \|
	23	SNDRV_PCM_INFO_MMAP_VALID,
	24	.formats = SNDRV_PCM_FMTBIT_S32_LE \| SNDRV_PCM_FMTBIT_S16_LE,
	25
	26	.rates = SNDRV_PCM_RATE_CONTINUOUS,
	27	.rate_min = 8000,
	28	.rate_max = 96000,
	29
	30	.channels_min = 2,
	31	.channels_max = 8,
	32
	33	.periods_min = 2,
	34	.periods_max = 48,
	35
	36	.period_bytes_min = 128,
	37	.period_bytes_max = 64 * PAGE_SIZE,
	38	.buffer_bytes_max = 256 * PAGE_SIZE
	39	};
	40
	41	/*
	42	* uni_reader_irq_handler
	43	* In case of error audio stream is stopped; stop action is protected via PCM
	44	* stream lock to avoid race condition with trigger callback.
	45	*/
	46	static irqreturn_t uni_reader_irq_handler(int irq, void *dev_id)
	47	{
	48	irqreturn_t ret = IRQ_NONE;
	49	struct uniperif *reader = dev_id;
	50	unsigned int status;
	51
	52	if (reader->state == UNIPERIF_STATE_STOPPED) {
	53	/* Unexpected IRQ: do nothing */
	54	dev_warn(reader->dev, "unexpected IRQ ");
	55	return IRQ_HANDLED;
	56	}
	57
	58	/* Get interrupt status & clear them immediately */
	59	status = GET_UNIPERIF_ITS(reader);
	60	SET_UNIPERIF_ITS_BCLR(reader, status);
	61
	62	/* Check for fifo overflow error */
	63	if (unlikely(status & UNIPERIF_ITS_FIFO_ERROR_MASK(reader))) {
	64	dev_err(reader->dev, "FIFO error detected");
	65
	66	snd_pcm_stream_lock(reader->substream);
	67	snd_pcm_stop(reader->substream, SNDRV_PCM_STATE_XRUN);
	68	snd_pcm_stream_unlock(reader->substream);
	69
	70	return IRQ_HANDLED;
	71	}
	72
	73	return ret;
	74	}
	75
	76	static int uni_reader_prepare(struct snd_pcm_substream *substream,
	77	struct snd_soc_dai *dai)
	78	{
	79	struct sti_uniperiph_data *priv = snd_soc_dai_get_drvdata(dai);
	80	struct uniperif *reader = priv->dai_data.uni;
	81	struct snd_pcm_runtime *runtime = substream->runtime;
	82	int transfer_size, trigger_limit;
	83	int slot_width;
	84	int count = 10;
85
86	/* The reader should be stopped */
87	if (reader->state != UNIPERIF_STATE_STOPPED) {
88	dev_err(reader->dev, "%s: invalid reader state %d", __func__,
89	reader->state);
90	return -EINVAL;
91	}
92
93	/* Calculate transfer size (in fifo cells and bytes) for frame count */
94	transfer_size = runtime->channels * UNIPERIF_FIFO_FRAMES;
95
96	/* Calculate number of empty cells available before asserting DREQ */
97	if (reader->ver < SND_ST_UNIPERIF_VERSION_UNI_PLR_TOP_1_0)
98	trigger_limit = UNIPERIF_FIFO_SIZE - transfer_size;
99	else
100	/*
101	* Since SND_ST_UNIPERIF_VERSION_UNI_PLR_TOP_1_0
102	* FDMA_TRIGGER_LIMIT also controls when the state switches
103	* from OFF or STANDBY to AUDIO DATA.
104	*/
105	trigger_limit = transfer_size;
106
107	/* Trigger limit must be an even number */
108	if ((!trigger_limit % 2) \|\|
109	(trigger_limit != 1 && transfer_size % 2) \|\|
110	(trigger_limit > UNIPERIF_CONFIG_DMA_TRIG_LIMIT_MASK(reader))) {
111	dev_err(reader->dev, "invalid trigger limit %d", trigger_limit);
112	return -EINVAL;
113	}
114
115	SET_UNIPERIF_CONFIG_DMA_TRIG_LIMIT(reader, trigger_limit);
116
117	switch (reader->daifmt & SND_SOC_DAIFMT_INV_MASK) {
118	case SND_SOC_DAIFMT_IB_IF:
119	case SND_SOC_DAIFMT_NB_IF:
120	SET_UNIPERIF_I2S_FMT_LR_POL_HIG(reader);
121	break;
122	default:
123	SET_UNIPERIF_I2S_FMT_LR_POL_LOW(reader);
124	}
125
126	/* Force slot width to 32 in I2S mode */
127	if ((reader->daifmt & SND_SOC_DAIFMT_FORMAT_MASK)
128	== SND_SOC_DAIFMT_I2S) {
129	slot_width = 32;
130	} else {
131	switch (runtime->format) {
132	case SNDRV_PCM_FORMAT_S16_LE:
133	slot_width = 16;
134	break;
135	default:
136	slot_width = 32;
137	break;
138	}
139	}
140
141	/* Number of bits per subframe (i.e one channel sample) on input. */
142	switch (slot_width) {
143	case 32:
144	SET_UNIPERIF_I2S_FMT_NBIT_32(reader);
145	SET_UNIPERIF_I2S_FMT_DATA_SIZE_32(reader);
146	break;
147	case 16:
148	SET_UNIPERIF_I2S_FMT_NBIT_16(reader);
149	SET_UNIPERIF_I2S_FMT_DATA_SIZE_16(reader);
150	break;
151	default:
152	dev_err(reader->dev, "subframe format not supported");
153	return -EINVAL;
154	}
155
156	/* Configure data memory format */
157	switch (runtime->format) {
158	case SNDRV_PCM_FORMAT_S16_LE:
159	/* One data word contains two samples */
160	SET_UNIPERIF_CONFIG_MEM_FMT_16_16(reader);
161	break;
162
163	case SNDRV_PCM_FORMAT_S32_LE:
164	/*
165	* Actually "16 bits/0 bits" means "32/28/24/20/18/16 bits
166	* on the MSB then zeros (if less than 32 bytes)"...
167	*/
168	SET_UNIPERIF_CONFIG_MEM_FMT_16_0(reader);
169	break;
170
171	default:
172	dev_err(reader->dev, "format not supported");
173	return -EINVAL;
174	}
175
176	switch (reader->daifmt & SND_SOC_DAIFMT_FORMAT_MASK) {
177	case SND_SOC_DAIFMT_I2S:
178	SET_UNIPERIF_I2S_FMT_ALIGN_LEFT(reader);
179	SET_UNIPERIF_I2S_FMT_PADDING_I2S_MODE(reader);
180	break;
181	case SND_SOC_DAIFMT_LEFT_J:
182	SET_UNIPERIF_I2S_FMT_ALIGN_LEFT(reader);
183	SET_UNIPERIF_I2S_FMT_PADDING_SONY_MODE(reader);
184	break;
185	case SND_SOC_DAIFMT_RIGHT_J:
186	SET_UNIPERIF_I2S_FMT_ALIGN_RIGHT(reader);
187	SET_UNIPERIF_I2S_FMT_PADDING_SONY_MODE(reader);
188	break;
189	default:
190	dev_err(reader->dev, "format not supported");
191	return -EINVAL;
192	}
193
194	SET_UNIPERIF_I2S_FMT_ORDER_MSB(reader);
195
196	/* Data clocking (changing) on the rising edge */
197	SET_UNIPERIF_I2S_FMT_SCLK_EDGE_RISING(reader);
198
199	/* Number of channels must be even */
200
201	if ((runtime->channels % 2) \|\| (runtime->channels < 2) \|\|
202	(runtime->channels > 10)) {
203	dev_err(reader->dev, "%s: invalid nb of channels", __func__);
204	return -EINVAL;
205	}
206
207	SET_UNIPERIF_I2S_FMT_NUM_CH(reader, runtime->channels / 2);
208
209	/* Clear any pending interrupts */
210	SET_UNIPERIF_ITS_BCLR(reader, GET_UNIPERIF_ITS(reader));
211
212	SET_UNIPERIF_I2S_FMT_NO_OF_SAMPLES_TO_READ(reader, 0);
213
214	/* Set the interrupt mask */
215	SET_UNIPERIF_ITM_BSET_DMA_ERROR(reader);
216	SET_UNIPERIF_ITM_BSET_FIFO_ERROR(reader);
217	SET_UNIPERIF_ITM_BSET_MEM_BLK_READ(reader);
218
219	/* Enable underflow recovery interrupts */
220	if (reader->info->underflow_enabled) {
221	SET_UNIPERIF_ITM_BSET_UNDERFLOW_REC_DONE(reader);
222	SET_UNIPERIF_ITM_BSET_UNDERFLOW_REC_FAILED(reader);
223	}
224
225	/* Reset uniperipheral reader */
226	SET_UNIPERIF_SOFT_RST_SOFT_RST(reader);
227
228	while (GET_UNIPERIF_SOFT_RST_SOFT_RST(reader)) {
229	udelay(5);
230	count--;
231	}
232	if (!count) {
233	dev_err(reader->dev, "Failed to reset uniperif");
234	return -EIO;
235	}
236
237	return 0;
238	}
239
240	static int uni_reader_start(struct uniperif *reader)
241	{
242	/* The reader should be stopped */
243	if (reader->state != UNIPERIF_STATE_STOPPED) {
244	dev_err(reader->dev, "%s: invalid reader state", __func__);
245	return -EINVAL;
246	}
247
248	/* Enable reader interrupts (and clear possible stalled ones) */
249	SET_UNIPERIF_ITS_BCLR_FIFO_ERROR(reader);
250	SET_UNIPERIF_ITM_BSET_FIFO_ERROR(reader);
251
252	/* Launch the reader */
253	SET_UNIPERIF_CTRL_OPERATION_PCM_DATA(reader);
254
255	/* Update state to started */
256	reader->state = UNIPERIF_STATE_STARTED;
257	return 0;
258	}
259
260	static int uni_reader_stop(struct uniperif *reader)
261	{
262	/* The reader should not be in stopped state */
263	if (reader->state == UNIPERIF_STATE_STOPPED) {
264	dev_err(reader->dev, "%s: invalid reader state", __func__);
265	return -EINVAL;
266	}
267
268	/* Turn the reader off */
269	SET_UNIPERIF_CTRL_OPERATION_OFF(reader);
270
271	/* Disable interrupts */
272	SET_UNIPERIF_ITM_BCLR(reader, GET_UNIPERIF_ITM(reader));
273
274	/* Update state to stopped and return */
275	reader->state = UNIPERIF_STATE_STOPPED;
276
277	return 0;
278	}
279
280	static int uni_reader_trigger(struct snd_pcm_substream *substream,
281	int cmd, struct snd_soc_dai *dai)
282	{
283	struct sti_uniperiph_data *priv = snd_soc_dai_get_drvdata(dai);
284	struct uniperif *reader = priv->dai_data.uni;
285
286	switch (cmd) {
287	case SNDRV_PCM_TRIGGER_START:
288	return uni_reader_start(reader);
289	case SNDRV_PCM_TRIGGER_STOP:
290	return uni_reader_stop(reader);
291	default:
292	return -EINVAL;
293	}
294	}
295
296	static void uni_reader_shutdown(struct snd_pcm_substream *substream,
297	struct snd_soc_dai *dai)
298	{
299	struct sti_uniperiph_data *priv = snd_soc_dai_get_drvdata(dai);
300	struct uniperif *reader = priv->dai_data.uni;
301
302	if (reader->state != UNIPERIF_STATE_STOPPED) {
303	/* Stop the reader */
304	uni_reader_stop(reader);
305	}
306	}
307
308	static int uni_reader_parse_dt(struct platform_device *pdev,
309	struct uniperif *reader)
310	{
311	struct uniperif_info *info;
312	struct device_node *node = pdev->dev.of_node;
313
314	/* Allocate memory for the info structure */
315	info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
316	if (!info)
317	return -ENOMEM;
318
3a0e27d8 AP	319	if (of_property_read_u32(node, "version", &reader->ver) \|\|
	320	reader->ver == SND_ST_UNIPERIF_VERSION_UNKNOWN) {
	321	dev_err(&pdev->dev, "Unknown uniperipheral version ");
	322	return -EINVAL;
	323	}
c3a0003a AP	324
	325	/* Save the info structure */
	326	reader->info = info;
	327
	328	return 0;
	329	}
	330
f2da4542	331	static const struct snd_soc_dai_ops uni_reader_dai_ops = {
c3a0003a AP	332	.shutdown = uni_reader_shutdown,
	333	.prepare = uni_reader_prepare,
	334	.trigger = uni_reader_trigger,
	335	.hw_params = sti_uniperiph_dai_hw_params,
	336	.set_fmt = sti_uniperiph_dai_set_fmt,
	337	};
	338
	339	int uni_reader_init(struct platform_device *pdev,
	340	struct uniperif *reader)
	341	{
	342	int ret = 0;
	343
	344	reader->dev = &pdev->dev;
	345	reader->state = UNIPERIF_STATE_STOPPED;
	346	reader->hw = &uni_reader_pcm_hw;
	347	reader->dai_ops = &uni_reader_dai_ops;
	348
	349	dev_err(reader->dev, "%s: enter\n", __func__);
	350	ret = uni_reader_parse_dt(pdev, reader);
	351	if (ret < 0) {
	352	dev_err(reader->dev, "Failed to parse DeviceTree");
	353	return ret;
	354	}
	355
	356	ret = devm_request_irq(&pdev->dev, reader->irq,
	357	uni_reader_irq_handler, IRQF_SHARED,
	358	dev_name(&pdev->dev), reader);
	359	if (ret < 0) {
	360	dev_err(&pdev->dev, "Failed to request IRQ");
	361	return -EBUSY;
	362	}
	363
	364	return 0;
	365	}
	366	EXPORT_SYMBOL_GPL(uni_reader_init);