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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6
[mv-sheeva.git] / drivers / mfd / twl4030-codec.c
1 /*
2  * MFD driver for twl4030 codec submodule
3  *
4  * Author:      Peter Ujfalusi <peter.ujfalusi@nokia.com>
5  *
6  * Copyright:   (C) 2009 Nokia Corporation
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License version 2 as
10  * 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/module.h>
25 #include <linux/types.h>
26 #include <linux/slab.h>
27 #include <linux/kernel.h>
28 #include <linux/fs.h>
29 #include <linux/platform_device.h>
30 #include <linux/i2c/twl.h>
31 #include <linux/mfd/core.h>
32 #include <linux/mfd/twl4030-codec.h>
33
34 #define TWL4030_CODEC_CELLS     2
35
36 static struct platform_device *twl4030_codec_dev;
37
38 struct twl4030_codec_resource {
39         int request_count;
40         u8 reg;
41         u8 mask;
42 };
43
44 struct twl4030_codec {
45         unsigned int audio_mclk;
46         struct mutex mutex;
47         struct twl4030_codec_resource resource[TWL4030_CODEC_RES_MAX];
48         struct mfd_cell cells[TWL4030_CODEC_CELLS];
49 };
50
51 /*
52  * Modify the resource, the function returns the content of the register
53  * after the modification.
54  */
55 static int twl4030_codec_set_resource(enum twl4030_codec_res id, int enable)
56 {
57         struct twl4030_codec *codec = platform_get_drvdata(twl4030_codec_dev);
58         u8 val;
59
60         twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, &val,
61                         codec->resource[id].reg);
62
63         if (enable)
64                 val |= codec->resource[id].mask;
65         else
66                 val &= ~codec->resource[id].mask;
67
68         twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
69                                         val, codec->resource[id].reg);
70
71         return val;
72 }
73
74 static inline int twl4030_codec_get_resource(enum twl4030_codec_res id)
75 {
76         struct twl4030_codec *codec = platform_get_drvdata(twl4030_codec_dev);
77         u8 val;
78
79         twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, &val,
80                         codec->resource[id].reg);
81
82         return val;
83 }
84
85 /*
86  * Enable the resource.
87  * The function returns with error or the content of the register
88  */
89 int twl4030_codec_enable_resource(enum twl4030_codec_res id)
90 {
91         struct twl4030_codec *codec = platform_get_drvdata(twl4030_codec_dev);
92         int val;
93
94         if (id >= TWL4030_CODEC_RES_MAX) {
95                 dev_err(&twl4030_codec_dev->dev,
96                                 "Invalid resource ID (%u)\n", id);
97                 return -EINVAL;
98         }
99
100         mutex_lock(&codec->mutex);
101         if (!codec->resource[id].request_count)
102                 /* Resource was disabled, enable it */
103                 val = twl4030_codec_set_resource(id, 1);
104         else
105                 val = twl4030_codec_get_resource(id);
106
107         codec->resource[id].request_count++;
108         mutex_unlock(&codec->mutex);
109
110         return val;
111 }
112 EXPORT_SYMBOL_GPL(twl4030_codec_enable_resource);
113
114 /*
115  * Disable the resource.
116  * The function returns with error or the content of the register
117  */
118 int twl4030_codec_disable_resource(unsigned id)
119 {
120         struct twl4030_codec *codec = platform_get_drvdata(twl4030_codec_dev);
121         int val;
122
123         if (id >= TWL4030_CODEC_RES_MAX) {
124                 dev_err(&twl4030_codec_dev->dev,
125                                 "Invalid resource ID (%u)\n", id);
126                 return -EINVAL;
127         }
128
129         mutex_lock(&codec->mutex);
130         if (!codec->resource[id].request_count) {
131                 dev_err(&twl4030_codec_dev->dev,
132                         "Resource has been disabled already (%u)\n", id);
133                 mutex_unlock(&codec->mutex);
134                 return -EPERM;
135         }
136         codec->resource[id].request_count--;
137
138         if (!codec->resource[id].request_count)
139                 /* Resource can be disabled now */
140                 val = twl4030_codec_set_resource(id, 0);
141         else
142                 val = twl4030_codec_get_resource(id);
143
144         mutex_unlock(&codec->mutex);
145
146         return val;
147 }
148 EXPORT_SYMBOL_GPL(twl4030_codec_disable_resource);
149
150 unsigned int twl4030_codec_get_mclk(void)
151 {
152         struct twl4030_codec *codec = platform_get_drvdata(twl4030_codec_dev);
153
154         return codec->audio_mclk;
155 }
156 EXPORT_SYMBOL_GPL(twl4030_codec_get_mclk);
157
158 static int __devinit twl4030_codec_probe(struct platform_device *pdev)
159 {
160         struct twl4030_codec *codec;
161         struct twl4030_codec_data *pdata = pdev->dev.platform_data;
162         struct mfd_cell *cell = NULL;
163         int ret, childs = 0;
164         u8 val;
165
166         if (!pdata) {
167                 dev_err(&pdev->dev, "Platform data is missing\n");
168                 return -EINVAL;
169         }
170
171         /* Configure APLL_INFREQ and disable APLL if enabled */
172         val = 0;
173         switch (pdata->audio_mclk) {
174         case 19200000:
175                 val |= TWL4030_APLL_INFREQ_19200KHZ;
176                 break;
177         case 26000000:
178                 val |= TWL4030_APLL_INFREQ_26000KHZ;
179                 break;
180         case 38400000:
181                 val |= TWL4030_APLL_INFREQ_38400KHZ;
182                 break;
183         default:
184                 dev_err(&pdev->dev, "Invalid audio_mclk\n");
185                 return -EINVAL;
186         }
187         twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
188                                         val, TWL4030_REG_APLL_CTL);
189
190         codec = kzalloc(sizeof(struct twl4030_codec), GFP_KERNEL);
191         if (!codec)
192                 return -ENOMEM;
193
194         platform_set_drvdata(pdev, codec);
195
196         twl4030_codec_dev = pdev;
197         mutex_init(&codec->mutex);
198         codec->audio_mclk = pdata->audio_mclk;
199
200         /* Codec power */
201         codec->resource[TWL4030_CODEC_RES_POWER].reg = TWL4030_REG_CODEC_MODE;
202         codec->resource[TWL4030_CODEC_RES_POWER].mask = TWL4030_CODECPDZ;
203
204         /* PLL */
205         codec->resource[TWL4030_CODEC_RES_APLL].reg = TWL4030_REG_APLL_CTL;
206         codec->resource[TWL4030_CODEC_RES_APLL].mask = TWL4030_APLL_EN;
207
208         if (pdata->audio) {
209                 cell = &codec->cells[childs];
210                 cell->name = "twl4030-codec";
211                 cell->platform_data = pdata->audio;
212                 cell->data_size = sizeof(*pdata->audio);
213                 childs++;
214         }
215         if (pdata->vibra) {
216                 cell = &codec->cells[childs];
217                 cell->name = "twl4030-vibra";
218                 cell->platform_data = pdata->vibra;
219                 cell->data_size = sizeof(*pdata->vibra);
220                 childs++;
221         }
222
223         if (childs)
224                 ret = mfd_add_devices(&pdev->dev, pdev->id, codec->cells,
225                                       childs, NULL, 0);
226         else {
227                 dev_err(&pdev->dev, "No platform data found for childs\n");
228                 ret = -ENODEV;
229         }
230
231         if (!ret)
232                 return 0;
233
234         platform_set_drvdata(pdev, NULL);
235         kfree(codec);
236         twl4030_codec_dev = NULL;
237         return ret;
238 }
239
240 static int __devexit twl4030_codec_remove(struct platform_device *pdev)
241 {
242         struct twl4030_codec *codec = platform_get_drvdata(pdev);
243
244         mfd_remove_devices(&pdev->dev);
245         platform_set_drvdata(pdev, NULL);
246         kfree(codec);
247         twl4030_codec_dev = NULL;
248
249         return 0;
250 }
251
252 MODULE_ALIAS("platform:twl4030-audio");
253
254 static struct platform_driver twl4030_codec_driver = {
255         .probe          = twl4030_codec_probe,
256         .remove         = __devexit_p(twl4030_codec_remove),
257         .driver         = {
258                 .owner  = THIS_MODULE,
259                 .name   = "twl4030-audio",
260         },
261 };
262
263 static int __devinit twl4030_codec_init(void)
264 {
265         return platform_driver_register(&twl4030_codec_driver);
266 }
267 module_init(twl4030_codec_init);
268
269 static void __devexit twl4030_codec_exit(void)
270 {
271         platform_driver_unregister(&twl4030_codec_driver);
272 }
273 module_exit(twl4030_codec_exit);
274
275 MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@nokia.com>");
276 MODULE_LICENSE("GPL");
277