1/*
2 * bf6xx-i2s.c - Analog Devices BF6XX i2s interface driver
3 *
4 * Copyright (c) 2012 Analog Devices Inc.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18 */
19
20#include <linux/device.h>
21#include <linux/init.h>
22#include <linux/module.h>
23#include <linux/platform_device.h>
24#include <sound/pcm.h>
25#include <sound/pcm_params.h>
26#include <sound/soc.h>
27#include <sound/soc-dai.h>
28
29#include "bf6xx-sport.h"
30
31struct sport_params param;
32
33static int bfin_i2s_set_dai_fmt(struct snd_soc_dai *cpu_dai,
34		unsigned int fmt)
35{
36	struct sport_device *sport = snd_soc_dai_get_drvdata(cpu_dai);
37	struct device *dev = &sport->pdev->dev;
38	int ret = 0;
39
40	param.spctl &= ~(SPORT_CTL_OPMODE | SPORT_CTL_CKRE | SPORT_CTL_FSR
41			| SPORT_CTL_LFS | SPORT_CTL_LAFS);
42	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
43	case SND_SOC_DAIFMT_I2S:
44		param.spctl |= SPORT_CTL_OPMODE | SPORT_CTL_CKRE
45			| SPORT_CTL_LFS;
46		break;
47	case SND_SOC_DAIFMT_DSP_A:
48		param.spctl |= SPORT_CTL_FSR;
49		break;
50	case SND_SOC_DAIFMT_LEFT_J:
51		param.spctl |= SPORT_CTL_OPMODE | SPORT_CTL_LFS
52			| SPORT_CTL_LAFS;
53		break;
54	default:
55		dev_err(dev, "%s: Unknown DAI format type\n", __func__);
56		ret = -EINVAL;
57		break;
58	}
59
60	param.spctl &= ~(SPORT_CTL_ICLK | SPORT_CTL_IFS);
61	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
62	case SND_SOC_DAIFMT_CBM_CFM:
63		break;
64	case SND_SOC_DAIFMT_CBS_CFS:
65	case SND_SOC_DAIFMT_CBM_CFS:
66	case SND_SOC_DAIFMT_CBS_CFM:
67		ret = -EINVAL;
68		break;
69	default:
70		dev_err(dev, "%s: Unknown DAI master type\n", __func__);
71		ret = -EINVAL;
72		break;
73	}
74
75	return ret;
76}
77
78static int bfin_i2s_hw_params(struct snd_pcm_substream *substream,
79				struct snd_pcm_hw_params *params,
80				struct snd_soc_dai *dai)
81{
82	struct sport_device *sport = snd_soc_dai_get_drvdata(dai);
83	struct device *dev = &sport->pdev->dev;
84	int ret = 0;
85
86	param.spctl &= ~SPORT_CTL_SLEN;
87	switch (params_format(params)) {
88	case SNDRV_PCM_FORMAT_S8:
89		param.spctl |= 0x70;
90		sport->wdsize = 1;
91		break;
92	case SNDRV_PCM_FORMAT_S16_LE:
93		param.spctl |= 0xf0;
94		sport->wdsize = 2;
95		break;
96	case SNDRV_PCM_FORMAT_S24_LE:
97		param.spctl |= 0x170;
98		sport->wdsize = 3;
99		break;
100	case SNDRV_PCM_FORMAT_S32_LE:
101		param.spctl |= 0x1f0;
102		sport->wdsize = 4;
103		break;
104	}
105
106	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
107		ret = sport_set_tx_params(sport, &param);
108		if (ret) {
109			dev_err(dev, "SPORT tx is busy!\n");
110			return ret;
111		}
112	} else {
113		ret = sport_set_rx_params(sport, &param);
114		if (ret) {
115			dev_err(dev, "SPORT rx is busy!\n");
116			return ret;
117		}
118	}
119	return 0;
120}
121
122#ifdef CONFIG_PM
123static int bfin_i2s_suspend(struct snd_soc_dai *dai)
124{
125	struct sport_device *sport = snd_soc_dai_get_drvdata(dai);
126
127	if (dai->capture_active)
128		sport_rx_stop(sport);
129	if (dai->playback_active)
130		sport_tx_stop(sport);
131	return 0;
132}
133
134static int bfin_i2s_resume(struct snd_soc_dai *dai)
135{
136	struct sport_device *sport = snd_soc_dai_get_drvdata(dai);
137	struct device *dev = &sport->pdev->dev;
138	int ret;
139
140	ret = sport_set_tx_params(sport, &param);
141	if (ret) {
142		dev_err(dev, "SPORT tx is busy!\n");
143		return ret;
144	}
145	ret = sport_set_rx_params(sport, &param);
146	if (ret) {
147		dev_err(dev, "SPORT rx is busy!\n");
148		return ret;
149	}
150
151	return 0;
152}
153
154#else
155#define bfin_i2s_suspend NULL
156#define bfin_i2s_resume NULL
157#endif
158
159#define BFIN_I2S_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
160		SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 | \
161		SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 | \
162		SNDRV_PCM_RATE_96000)
163
164#define BFIN_I2S_FORMATS (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE | \
165		SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE)
166
167static struct snd_soc_dai_ops bfin_i2s_dai_ops = {
168	.hw_params	= bfin_i2s_hw_params,
169	.set_fmt	= bfin_i2s_set_dai_fmt,
170};
171
172static struct snd_soc_dai_driver bfin_i2s_dai = {
173	.suspend = bfin_i2s_suspend,
174	.resume = bfin_i2s_resume,
175	.playback = {
176		.channels_min = 1,
177		.channels_max = 2,
178		.rates = BFIN_I2S_RATES,
179		.formats = BFIN_I2S_FORMATS,
180	},
181	.capture = {
182		.channels_min = 1,
183		.channels_max = 2,
184		.rates = BFIN_I2S_RATES,
185		.formats = BFIN_I2S_FORMATS,
186	},
187	.ops = &bfin_i2s_dai_ops,
188};
189
190static const struct snd_soc_component_driver bfin_i2s_component = {
191	.name		= "bfin-i2s",
192};
193
194static int bfin_i2s_probe(struct platform_device *pdev)
195{
196	struct sport_device *sport;
197	struct device *dev = &pdev->dev;
198	int ret;
199
200	sport = sport_create(pdev);
201	if (!sport)
202		return -ENODEV;
203
204	/* register with the ASoC layers */
205	ret = snd_soc_register_component(dev, &bfin_i2s_component,
206					 &bfin_i2s_dai, 1);
207	if (ret) {
208		dev_err(dev, "Failed to register DAI: %d\n", ret);
209		sport_delete(sport);
210		return ret;
211	}
212	platform_set_drvdata(pdev, sport);
213
214	return 0;
215}
216
217static int bfin_i2s_remove(struct platform_device *pdev)
218{
219	struct sport_device *sport = platform_get_drvdata(pdev);
220
221	snd_soc_unregister_component(&pdev->dev);
222	sport_delete(sport);
223
224	return 0;
225}
226
227static struct platform_driver bfin_i2s_driver = {
228	.probe  = bfin_i2s_probe,
229	.remove = bfin_i2s_remove,
230	.driver = {
231		.name = "bfin-i2s",
232	},
233};
234
235module_platform_driver(bfin_i2s_driver);
236
237MODULE_DESCRIPTION("Analog Devices BF6XX i2s interface driver");
238MODULE_AUTHOR("Scott Jiang <Scott.Jiang.Linux@gmail.com>");
239MODULE_LICENSE("GPL v2");
240