2 * MFD driver for twl4030 codec submodule
4 * Author: Peter Ujfalusi <peter.ujfalusi@nokia.com>
6 * Copyright: (C) 2009 Nokia Corporation
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.
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.
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
24 #include <linux/module.h>
25 #include <linux/types.h>
26 #include <linux/slab.h>
27 #include <linux/kernel.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>
34 #define TWL4030_CODEC_CELLS 2
36 static struct platform_device *twl4030_codec_dev;
38 struct twl4030_codec_resource {
44 struct twl4030_codec {
45 unsigned int audio_mclk;
47 struct twl4030_codec_resource resource[TWL4030_CODEC_RES_MAX];
48 struct mfd_cell cells[TWL4030_CODEC_CELLS];
52 * Modify the resource, the function returns the content of the register
53 * after the modification.
55 static int twl4030_codec_set_resource(enum twl4030_codec_res id, int enable)
57 struct twl4030_codec *codec = platform_get_drvdata(twl4030_codec_dev);
60 twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, &val,
61 codec->resource[id].reg);
64 val |= codec->resource[id].mask;
66 val &= ~codec->resource[id].mask;
68 twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
69 val, codec->resource[id].reg);
74 static inline int twl4030_codec_get_resource(enum twl4030_codec_res id)
76 struct twl4030_codec *codec = platform_get_drvdata(twl4030_codec_dev);
79 twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, &val,
80 codec->resource[id].reg);
86 * Enable the resource.
87 * The function returns with error or the content of the register
89 int twl4030_codec_enable_resource(enum twl4030_codec_res id)
91 struct twl4030_codec *codec = platform_get_drvdata(twl4030_codec_dev);
94 if (id >= TWL4030_CODEC_RES_MAX) {
95 dev_err(&twl4030_codec_dev->dev,
96 "Invalid resource ID (%u)\n", id);
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);
105 val = twl4030_codec_get_resource(id);
107 codec->resource[id].request_count++;
108 mutex_unlock(&codec->mutex);
112 EXPORT_SYMBOL_GPL(twl4030_codec_enable_resource);
115 * Disable the resource.
116 * The function returns with error or the content of the register
118 int twl4030_codec_disable_resource(unsigned id)
120 struct twl4030_codec *codec = platform_get_drvdata(twl4030_codec_dev);
123 if (id >= TWL4030_CODEC_RES_MAX) {
124 dev_err(&twl4030_codec_dev->dev,
125 "Invalid resource ID (%u)\n", id);
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);
136 codec->resource[id].request_count--;
138 if (!codec->resource[id].request_count)
139 /* Resource can be disabled now */
140 val = twl4030_codec_set_resource(id, 0);
142 val = twl4030_codec_get_resource(id);
144 mutex_unlock(&codec->mutex);
148 EXPORT_SYMBOL_GPL(twl4030_codec_disable_resource);
150 unsigned int twl4030_codec_get_mclk(void)
152 struct twl4030_codec *codec = platform_get_drvdata(twl4030_codec_dev);
154 return codec->audio_mclk;
156 EXPORT_SYMBOL_GPL(twl4030_codec_get_mclk);
158 static int __devinit twl4030_codec_probe(struct platform_device *pdev)
160 struct twl4030_codec *codec;
161 struct twl4030_codec_data *pdata = pdev->dev.platform_data;
162 struct mfd_cell *cell = NULL;
167 dev_err(&pdev->dev, "Platform data is missing\n");
171 /* Configure APLL_INFREQ and disable APLL if enabled */
173 switch (pdata->audio_mclk) {
175 val |= TWL4030_APLL_INFREQ_19200KHZ;
178 val |= TWL4030_APLL_INFREQ_26000KHZ;
181 val |= TWL4030_APLL_INFREQ_38400KHZ;
184 dev_err(&pdev->dev, "Invalid audio_mclk\n");
187 twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
188 val, TWL4030_REG_APLL_CTL);
190 codec = kzalloc(sizeof(struct twl4030_codec), GFP_KERNEL);
194 platform_set_drvdata(pdev, codec);
196 twl4030_codec_dev = pdev;
197 mutex_init(&codec->mutex);
198 codec->audio_mclk = pdata->audio_mclk;
201 codec->resource[TWL4030_CODEC_RES_POWER].reg = TWL4030_REG_CODEC_MODE;
202 codec->resource[TWL4030_CODEC_RES_POWER].mask = TWL4030_CODECPDZ;
205 codec->resource[TWL4030_CODEC_RES_APLL].reg = TWL4030_REG_APLL_CTL;
206 codec->resource[TWL4030_CODEC_RES_APLL].mask = TWL4030_APLL_EN;
209 cell = &codec->cells[childs];
210 cell->name = "twl4030-codec";
211 cell->mfd_data = pdata->audio;
215 cell = &codec->cells[childs];
216 cell->name = "twl4030-vibra";
217 cell->mfd_data = pdata->vibra;
222 ret = mfd_add_devices(&pdev->dev, pdev->id, codec->cells,
225 dev_err(&pdev->dev, "No platform data found for childs\n");
232 platform_set_drvdata(pdev, NULL);
234 twl4030_codec_dev = NULL;
238 static int __devexit twl4030_codec_remove(struct platform_device *pdev)
240 struct twl4030_codec *codec = platform_get_drvdata(pdev);
242 mfd_remove_devices(&pdev->dev);
243 platform_set_drvdata(pdev, NULL);
245 twl4030_codec_dev = NULL;
250 MODULE_ALIAS("platform:twl4030-audio");
252 static struct platform_driver twl4030_codec_driver = {
253 .probe = twl4030_codec_probe,
254 .remove = __devexit_p(twl4030_codec_remove),
256 .owner = THIS_MODULE,
257 .name = "twl4030-audio",
261 static int __devinit twl4030_codec_init(void)
263 return platform_driver_register(&twl4030_codec_driver);
265 module_init(twl4030_codec_init);
267 static void __devexit twl4030_codec_exit(void)
269 platform_driver_unregister(&twl4030_codec_driver);
271 module_exit(twl4030_codec_exit);
273 MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@nokia.com>");
274 MODULE_LICENSE("GPL");