aboutsummaryrefslogtreecommitdiff
path: root/drivers/mfd/twl4030-codec.c
blob: 77b914907d7c20a96c9d1db4c2c18a9c8b49edda (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
/*
 * MFD driver for twl4030 codec submodule
 *
 * Author:	Peter Ujfalusi <peter.ujfalusi@nokia.com>
 *
 * Copyright:   (C) 2009 Nokia Corporation
 *
 * 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/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/platform_device.h>
#include <linux/i2c/twl4030.h>
#include <linux/mfd/core.h>
#include <linux/mfd/twl4030-codec.h>

#define TWL4030_CODEC_CELLS	2

static struct platform_device *twl4030_codec_dev;

struct twl4030_codec_resource {
	int request_count;
	u8 reg;
	u8 mask;
};

struct twl4030_codec {
	unsigned int audio_mclk;
	struct mutex mutex;
	struct twl4030_codec_resource resource[TWL4030_CODEC_RES_MAX];
	struct mfd_cell cells[TWL4030_CODEC_CELLS];
};

/*
 * Modify the resource, the function returns the content of the register
 * after the modification.
 */
static int twl4030_codec_set_resource(enum twl4030_codec_res id, int enable)
{
	struct twl4030_codec *codec = platform_get_drvdata(twl4030_codec_dev);
	u8 val;

	twl4030_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, &val,
			codec->resource[id].reg);

	if (enable)
		val |= codec->resource[id].mask;
	else
		val &= ~codec->resource[id].mask;

	twl4030_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
					val, codec->resource[id].reg);

	return val;
}

static inline int twl4030_codec_get_resource(enum twl4030_codec_res id)
{
	struct twl4030_codec *codec = platform_get_drvdata(twl4030_codec_dev);
	u8 val;

	twl4030_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, &val,
			codec->resource[id].reg);

	return val;
}

/*
 * Enable the resource.
 * The function returns with error or the content of the register
 */
int twl4030_codec_enable_resource(enum twl4030_codec_res id)
{
	struct twl4030_codec *codec = platform_get_drvdata(twl4030_codec_dev);
	int val;

	if (id >= TWL4030_CODEC_RES_MAX) {
		dev_err(&twl4030_codec_dev->dev,
				"Invalid resource ID (%u)\n", id);
		return -EINVAL;
	}

	mutex_lock(&codec->mutex);
	if (!codec->resource[id].request_count)
		/* Resource was disabled, enable it */
		val = twl4030_codec_set_resource(id, 1);
	else
		val = twl4030_codec_get_resource(id);

	codec->resource[id].request_count++;
	mutex_unlock(&codec->mutex);

	return val;
}
EXPORT_SYMBOL_GPL(twl4030_codec_enable_resource);

/*
 * Disable the resource.
 * The function returns with error or the content of the register
 */
int twl4030_codec_disable_resource(unsigned id)
{
	struct twl4030_codec *codec = platform_get_drvdata(twl4030_codec_dev);
	int val;

	if (id >= TWL4030_CODEC_RES_MAX) {
		dev_err(&twl4030_codec_dev->dev,
				"Invalid resource ID (%u)\n", id);
		return -EINVAL;
	}

	mutex_lock(&codec->mutex);
	if (!codec->resource[id].request_count) {
		dev_err(&twl4030_codec_dev->dev,
			"Resource has been disabled already (%u)\n", id);
		mutex_unlock(&codec->mutex);
		return -EPERM;
	}
	codec->resource[id].request_count--;

	if (!codec->resource[id].request_count)
		/* Resource can be disabled now */
		val = twl4030_codec_set_resource(id, 0);
	else
		val = twl4030_codec_get_resource(id);

	mutex_unlock(&codec->mutex);

	return val;
}
EXPORT_SYMBOL_GPL(twl4030_codec_disable_resource);

unsigned int twl4030_codec_get_mclk(void)
{
	struct twl4030_codec *codec = platform_get_drvdata(twl4030_codec_dev);

	return codec->audio_mclk;
}
EXPORT_SYMBOL_GPL(twl4030_codec_get_mclk);

static int __devinit twl4030_codec_probe(struct platform_device *pdev)
{
	struct twl4030_codec *codec;
	struct twl4030_codec_data *pdata = pdev->dev.platform_data;
	struct mfd_cell *cell = NULL;
	int ret, childs = 0;
	u8 val;

	if (!pdata) {
		dev_err(&pdev->dev, "Platform data is missing\n");
		return -EINVAL;
	}

	/* Configure APLL_INFREQ and disable APLL if enabled */
	val = 0;
	switch (pdata->audio_mclk) {
	case 19200000:
		val |= TWL4030_APLL_INFREQ_19200KHZ;
		break;
	case 26000000:
		val |= TWL4030_APLL_INFREQ_26000KHZ;
		break;
	case 38400000:
		val |= TWL4030_APLL_INFREQ_38400KHZ;
		break;
	default:
		dev_err(&pdev->dev, "Invalid audio_mclk\n");
		return -EINVAL;
	}
	twl4030_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
					val, TWL4030_REG_APLL_CTL);

	codec = kzalloc(sizeof(struct twl4030_codec), GFP_KERNEL);
	if (!codec)
		return -ENOMEM;

	platform_set_drvdata(pdev, codec);

	twl4030_codec_dev = pdev;
	mutex_init(&codec->mutex);
	codec->audio_mclk = pdata->audio_mclk;

	/* Codec power */
	codec->resource[TWL4030_CODEC_RES_POWER].reg = TWL4030_REG_CODEC_MODE;
	codec->resource[TWL4030_CODEC_RES_POWER].mask = TWL4030_CODECPDZ;

	/* PLL */
	codec->resource[TWL4030_CODEC_RES_APLL].reg = TWL4030_REG_APLL_CTL;
	codec->resource[TWL4030_CODEC_RES_APLL].mask = TWL4030_APLL_EN;

	if (pdata->audio) {
		cell = &codec->cells[childs];
		cell->name = "twl4030_codec_audio";
		cell->platform_data = pdata->audio;
		cell->data_size = sizeof(*pdata->audio);
		childs++;
	}
	if (pdata->vibra) {
		cell = &codec->cells[childs];
		cell->name = "twl4030_codec_vibra";
		cell->platform_data = pdata->vibra;
		cell->data_size = sizeof(*pdata->vibra);
		childs++;
	}

	if (childs)
		ret = mfd_add_devices(&pdev->dev, pdev->id, codec->cells,
				      childs, NULL, 0);
	else {
		dev_err(&pdev->dev, "No platform data found for childs\n");
		ret = -ENODEV;
	}

	if (!ret)
		return 0;

	platform_set_drvdata(pdev, NULL);
	kfree(codec);
	twl4030_codec_dev = NULL;
	return ret;
}

static int __devexit twl4030_codec_remove(struct platform_device *pdev)
{
	struct twl4030_codec *codec = platform_get_drvdata(pdev);

	mfd_remove_devices(&pdev->dev);
	platform_set_drvdata(pdev, NULL);
	kfree(codec);
	twl4030_codec_dev = NULL;

	return 0;
}

MODULE_ALIAS("platform:twl4030_codec");

static struct platform_driver twl4030_codec_driver = {
	.probe		= twl4030_codec_probe,
	.remove		= __devexit_p(twl4030_codec_remove),
	.driver		= {
		.owner	= THIS_MODULE,
		.name	= "twl4030_codec",
	},
};

static int __devinit twl4030_codec_init(void)
{
	return platform_driver_register(&twl4030_codec_driver);
}
module_init(twl4030_codec_init);

static void __devexit twl4030_codec_exit(void)
{
	platform_driver_unregister(&twl4030_codec_driver);
}
module_exit(twl4030_codec_exit);

MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@nokia.com>");
MODULE_LICENSE("GPL");