1/*
2 * osk5912.c  --  SoC audio for OSK 5912
3 *
4 * Copyright (C) 2008 Mistral Solutions
5 *
6 * Contact: Arun KS  <arunks@mistralsolutions.com>
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * version 2 as published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20 * 02110-1301 USA
21 *
22 */
23
24#include <linux/clk.h>
25#include <linux/platform_device.h>
26#include <sound/core.h>
27#include <sound/pcm.h>
28#include <sound/soc.h>
29
30#include <asm/mach-types.h>
31#include <linux/gpio.h>
32#include <linux/module.h>
33#include <linux/platform_data/asoc-ti-mcbsp.h>
34
35#include "omap-mcbsp.h"
36#include "../codecs/tlv320aic23.h"
37
38#define CODEC_CLOCK 	12000000
39
40static struct clk *tlv320aic23_mclk;
41
42static int osk_startup(struct snd_pcm_substream *substream)
43{
44	return clk_enable(tlv320aic23_mclk);
45}
46
47static void osk_shutdown(struct snd_pcm_substream *substream)
48{
49	clk_disable(tlv320aic23_mclk);
50}
51
52static int osk_hw_params(struct snd_pcm_substream *substream,
53			 struct snd_pcm_hw_params *params)
54{
55	struct snd_soc_pcm_runtime *rtd = substream->private_data;
56	struct snd_soc_dai *codec_dai = rtd->codec_dai;
57	int err;
58
59	/* Set the codec system clock for DAC and ADC */
60	err =
61	    snd_soc_dai_set_sysclk(codec_dai, 0, CODEC_CLOCK, SND_SOC_CLOCK_IN);
62
63	if (err < 0) {
64		printk(KERN_ERR "can't set codec system clock\n");
65		return err;
66	}
67
68	return err;
69}
70
71static struct snd_soc_ops osk_ops = {
72	.startup = osk_startup,
73	.hw_params = osk_hw_params,
74	.shutdown = osk_shutdown,
75};
76
77static const struct snd_soc_dapm_widget tlv320aic23_dapm_widgets[] = {
78	SND_SOC_DAPM_HP("Headphone Jack", NULL),
79	SND_SOC_DAPM_LINE("Line In", NULL),
80	SND_SOC_DAPM_MIC("Mic Jack", NULL),
81};
82
83static const struct snd_soc_dapm_route audio_map[] = {
84	{"Headphone Jack", NULL, "LHPOUT"},
85	{"Headphone Jack", NULL, "RHPOUT"},
86
87	{"LLINEIN", NULL, "Line In"},
88	{"RLINEIN", NULL, "Line In"},
89
90	{"MICIN", NULL, "Mic Jack"},
91};
92
93/* Digital audio interface glue - connects codec <--> CPU */
94static struct snd_soc_dai_link osk_dai = {
95	.name = "TLV320AIC23",
96	.stream_name = "AIC23",
97	.cpu_dai_name = "omap-mcbsp.1",
98	.codec_dai_name = "tlv320aic23-hifi",
99	.platform_name = "omap-mcbsp.1",
100	.codec_name = "tlv320aic23-codec",
101	.dai_fmt = SND_SOC_DAIFMT_DSP_B | SND_SOC_DAIFMT_NB_NF |
102		   SND_SOC_DAIFMT_CBM_CFM,
103	.ops = &osk_ops,
104};
105
106/* Audio machine driver */
107static struct snd_soc_card snd_soc_card_osk = {
108	.name = "OSK5912",
109	.owner = THIS_MODULE,
110	.dai_link = &osk_dai,
111	.num_links = 1,
112
113	.dapm_widgets = tlv320aic23_dapm_widgets,
114	.num_dapm_widgets = ARRAY_SIZE(tlv320aic23_dapm_widgets),
115	.dapm_routes = audio_map,
116	.num_dapm_routes = ARRAY_SIZE(audio_map),
117};
118
119static struct platform_device *osk_snd_device;
120
121static int __init osk_soc_init(void)
122{
123	int err;
124	u32 curRate;
125	struct device *dev;
126
127	if (!(machine_is_omap_osk()))
128		return -ENODEV;
129
130	osk_snd_device = platform_device_alloc("soc-audio", -1);
131	if (!osk_snd_device)
132		return -ENOMEM;
133
134	platform_set_drvdata(osk_snd_device, &snd_soc_card_osk);
135	err = platform_device_add(osk_snd_device);
136	if (err)
137		goto err1;
138
139	dev = &osk_snd_device->dev;
140
141	tlv320aic23_mclk = clk_get(dev, "mclk");
142	if (IS_ERR(tlv320aic23_mclk)) {
143		printk(KERN_ERR "Could not get mclk clock\n");
144		err = PTR_ERR(tlv320aic23_mclk);
145		goto err2;
146	}
147
148	/*
149	 * Configure 12 MHz output on MCLK.
150	 */
151	curRate = (uint) clk_get_rate(tlv320aic23_mclk);
152	if (curRate != CODEC_CLOCK) {
153		if (clk_set_rate(tlv320aic23_mclk, CODEC_CLOCK)) {
154			printk(KERN_ERR "Cannot set MCLK for AIC23 CODEC\n");
155			err = -ECANCELED;
156			goto err3;
157		}
158	}
159
160	printk(KERN_INFO "MCLK = %d [%d]\n",
161	       (uint) clk_get_rate(tlv320aic23_mclk), CODEC_CLOCK);
162
163	return 0;
164
165err3:
166	clk_put(tlv320aic23_mclk);
167err2:
168	platform_device_del(osk_snd_device);
169err1:
170	platform_device_put(osk_snd_device);
171
172	return err;
173
174}
175
176static void __exit osk_soc_exit(void)
177{
178	clk_put(tlv320aic23_mclk);
179	platform_device_unregister(osk_snd_device);
180}
181
182module_init(osk_soc_init);
183module_exit(osk_soc_exit);
184
185MODULE_AUTHOR("Arun KS <arunks@mistralsolutions.com>");
186MODULE_DESCRIPTION("ALSA SoC OSK 5912");
187MODULE_LICENSE("GPL");
188