1/*
  2 * omap-mcpdm.c  --  OMAP ALSA SoC DAI driver using McPDM port
  3 *
  4 * Copyright (C) 2009 Texas Instruments
  5 *
  6 * Author: Misael Lopez Cruz <x0052729@ti.com>
  7 * Contact: Jorge Eduardo Candelaria <x0107209@ti.com>
  8 *          Margarita Olaya <magi.olaya@ti.com>
  9 *
 10 * This program is free software; you can redistribute it and/or
 11 * modify it under the terms of the GNU General Public License
 12 * version 2 as published by the Free Software Foundation.
 13 *
 14 * This program is distributed in the hope that it will be useful, but
 15 * WITHOUT ANY WARRANTY; without even the implied warranty of
 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 17 * General Public License for more details.
 18 *
 19 * You should have received a copy of the GNU General Public License
 20 * along with this program; if not, write to the Free Software
 21 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 22 * 02110-1301 USA
 23 *
 24 */
 25
 26#include <linux/init.h>
 27#include <linux/module.h>
 28#include <linux/device.h>
 29#include <sound/core.h>
 30#include <sound/pcm.h>
 31#include <sound/pcm_params.h>
 32#include <sound/initval.h>
 33#include <sound/soc.h>
 34
 35#include <plat/dma.h>
 36#include <plat/mcbsp.h>
 37#include "mcpdm.h"
 38#include "omap-pcm.h"
 39
 40struct omap_mcpdm_data {
 41	struct omap_mcpdm_link *links;
 42	int active;
 43};
 44
 45static struct omap_mcpdm_link omap_mcpdm_links[] = {
 46	/* downlink */
 47	{
 48		.irq_mask = MCPDM_DN_IRQ_EMPTY | MCPDM_DN_IRQ_FULL,
 49		.threshold = 1,
 50		.format = PDMOUTFORMAT_LJUST,
 51	},
 52	/* uplink */
 53	{
 54		.irq_mask = MCPDM_UP_IRQ_EMPTY | MCPDM_UP_IRQ_FULL,
 55		.threshold = 1,
 56		.format = PDMOUTFORMAT_LJUST,
 57	},
 58};
 59
 60static struct omap_mcpdm_data mcpdm_data = {
 61	.links = omap_mcpdm_links,
 62	.active = 0,
 63};
 64
 65/*
 66 * Stream DMA parameters
 67 */
 68static struct omap_pcm_dma_data omap_mcpdm_dai_dma_params[] = {
 69	{
 70		.name = "Audio playback",
 71		.dma_req = OMAP44XX_DMA_MCPDM_DL,
 72		.data_type = OMAP_DMA_DATA_TYPE_S32,
 73		.sync_mode = OMAP_DMA_SYNC_PACKET,
 74		.packet_size = 16,
 75		.port_addr = OMAP44XX_MCPDM_L3_BASE + MCPDM_DN_DATA,
 76	},
 77	{
 78		.name = "Audio capture",
 79		.dma_req = OMAP44XX_DMA_MCPDM_UP,
 80		.data_type = OMAP_DMA_DATA_TYPE_S32,
 81		.sync_mode = OMAP_DMA_SYNC_PACKET,
 82		.packet_size = 16,
 83		.port_addr = OMAP44XX_MCPDM_L3_BASE + MCPDM_UP_DATA,
 84	},
 85};
 86
 87static int omap_mcpdm_dai_startup(struct snd_pcm_substream *substream,
 88				  struct snd_soc_dai *dai)
 89{
 90	int err = 0;
 91
 92	if (!dai->active)
 93		err = omap_mcpdm_request();
 94
 95	return err;
 96}
 97
 98static void omap_mcpdm_dai_shutdown(struct snd_pcm_substream *substream,
 99				    struct snd_soc_dai *dai)
100{
101	if (!dai->active)
102		omap_mcpdm_free();
103}
104
105static int omap_mcpdm_dai_trigger(struct snd_pcm_substream *substream, int cmd,
106				  struct snd_soc_dai *dai)
107{
108	struct omap_mcpdm_data *mcpdm_priv = snd_soc_dai_get_drvdata(dai);
109	int stream = substream->stream;
110	int err = 0;
111
112	switch (cmd) {
113	case SNDRV_PCM_TRIGGER_START:
114	case SNDRV_PCM_TRIGGER_RESUME:
115	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
116		if (!mcpdm_priv->active++)
117			omap_mcpdm_start(stream);
118		break;
119
120	case SNDRV_PCM_TRIGGER_STOP:
121	case SNDRV_PCM_TRIGGER_SUSPEND:
122	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
123		if (!--mcpdm_priv->active)
124			omap_mcpdm_stop(stream);
125		break;
126	default:
127		err = -EINVAL;
128	}
129
130	return err;
131}
132
133static int omap_mcpdm_dai_hw_params(struct snd_pcm_substream *substream,
134				    struct snd_pcm_hw_params *params,
135				    struct snd_soc_dai *dai)
136{
137	struct omap_mcpdm_data *mcpdm_priv = snd_soc_dai_get_drvdata(dai);
138	struct omap_mcpdm_link *mcpdm_links = mcpdm_priv->links;
139	int stream = substream->stream;
140	int channels, err, link_mask = 0;
141
142	snd_soc_dai_set_dma_data(dai, substream,
143				 &omap_mcpdm_dai_dma_params[stream]);
144
145	channels = params_channels(params);
146	switch (channels) {
147	case 4:
148		if (stream == SNDRV_PCM_STREAM_CAPTURE)
149			/* up to 2 channels for capture */
150			return -EINVAL;
151		link_mask |= 1 << 3;
152	case 3:
153		if (stream == SNDRV_PCM_STREAM_CAPTURE)
154			/* up to 2 channels for capture */
155			return -EINVAL;
156		link_mask |= 1 << 2;
157	case 2:
158		link_mask |= 1 << 1;
159	case 1:
160		link_mask |= 1 << 0;
161		break;
162	default:
163		/* unsupported number of channels */
164		return -EINVAL;
165	}
166
167	if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
168		mcpdm_links[stream].channels = link_mask << 3;
169		err = omap_mcpdm_playback_open(&mcpdm_links[stream]);
170	} else {
171		mcpdm_links[stream].channels = link_mask << 0;
172		err = omap_mcpdm_capture_open(&mcpdm_links[stream]);
173	}
174
175	return err;
176}
177
178static int omap_mcpdm_dai_hw_free(struct snd_pcm_substream *substream,
179				  struct snd_soc_dai *dai)
180{
181	struct omap_mcpdm_data *mcpdm_priv = snd_soc_dai_get_drvdata(dai);
182	struct omap_mcpdm_link *mcpdm_links = mcpdm_priv->links;
183	int stream = substream->stream;
184	int err;
185
186	if (substream->stream ==  SNDRV_PCM_STREAM_PLAYBACK)
187		err = omap_mcpdm_playback_close(&mcpdm_links[stream]);
188	else
189		err = omap_mcpdm_capture_close(&mcpdm_links[stream]);
190
191	return err;
192}
193
194static struct snd_soc_dai_ops omap_mcpdm_dai_ops = {
195	.startup	= omap_mcpdm_dai_startup,
196	.shutdown	= omap_mcpdm_dai_shutdown,
197	.trigger	= omap_mcpdm_dai_trigger,
198	.hw_params	= omap_mcpdm_dai_hw_params,
199	.hw_free	= omap_mcpdm_dai_hw_free,
200};
201
202#define OMAP_MCPDM_RATES	(SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
203#define OMAP_MCPDM_FORMATS	(SNDRV_PCM_FMTBIT_S32_LE)
204
205static int omap_mcpdm_dai_probe(struct snd_soc_dai *dai)
206{
207	snd_soc_dai_set_drvdata(dai, &mcpdm_data);
208	return 0;
209}
210
211static struct snd_soc_dai_driver omap_mcpdm_dai = {
212	.probe = omap_mcpdm_dai_probe,
213	.playback = {
214		.channels_min = 1,
215		.channels_max = 4,
216		.rates = OMAP_MCPDM_RATES,
217		.formats = OMAP_MCPDM_FORMATS,
218	},
219	.capture = {
220		.channels_min = 1,
221		.channels_max = 2,
222		.rates = OMAP_MCPDM_RATES,
223		.formats = OMAP_MCPDM_FORMATS,
224	},
225	.ops = &omap_mcpdm_dai_ops,
226};
227
228static __devinit int asoc_mcpdm_probe(struct platform_device *pdev)
229{
230	int ret;
231
232	ret = omap_mcpdm_probe(pdev);
233	if (ret < 0)
234		return ret;
235	ret = snd_soc_register_dai(&pdev->dev, &omap_mcpdm_dai);
236	if (ret < 0)
237		omap_mcpdm_remove(pdev);
238	return ret;
239}
240
241static int __devexit asoc_mcpdm_remove(struct platform_device *pdev)
242{
243	snd_soc_unregister_dai(&pdev->dev);
244	omap_mcpdm_remove(pdev);
245	return 0;
246}
247
248static struct platform_driver asoc_mcpdm_driver = {
249	.driver = {
250			.name = "omap-mcpdm-dai",
251			.owner = THIS_MODULE,
252	},
253
254	.probe = asoc_mcpdm_probe,
255	.remove = __devexit_p(asoc_mcpdm_remove),
256};
257
258static int __init snd_omap_mcpdm_init(void)
259{
260	return platform_driver_register(&asoc_mcpdm_driver);
261}
262module_init(snd_omap_mcpdm_init);
263
264static void __exit snd_omap_mcpdm_exit(void)
265{
266	platform_driver_unregister(&asoc_mcpdm_driver);
267}
268module_exit(snd_omap_mcpdm_exit);
269
270MODULE_AUTHOR("Misael Lopez Cruz <x0052729@ti.com>");
271MODULE_DESCRIPTION("OMAP PDM SoC Interface");
272MODULE_LICENSE("GPL");