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Peter Ujfalusi0b83dde2009-10-22 13:26:45 +03001/*
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/kernel.h>
27#include <linux/fs.h>
28#include <linux/platform_device.h>
Stephen Rothwell8bea8672009-12-15 16:33:10 +110029#include <linux/i2c/twl.h>
Peter Ujfalusi0b83dde2009-10-22 13:26:45 +030030#include <linux/mfd/core.h>
31#include <linux/mfd/twl4030-codec.h>
32
33#define TWL4030_CODEC_CELLS 2
34
35static struct platform_device *twl4030_codec_dev;
36
37struct twl4030_codec_resource {
38 int request_count;
39 u8 reg;
40 u8 mask;
41};
42
43struct twl4030_codec {
Peter Ujfalusif9b46392009-11-04 09:58:19 +020044 unsigned int audio_mclk;
Peter Ujfalusi0b83dde2009-10-22 13:26:45 +030045 struct mutex mutex;
46 struct twl4030_codec_resource resource[TWL4030_CODEC_RES_MAX];
47 struct mfd_cell cells[TWL4030_CODEC_CELLS];
48};
49
50/*
51 * Modify the resource, the function returns the content of the register
52 * after the modification.
53 */
54static int twl4030_codec_set_resource(enum twl4030_codec_res id, int enable)
55{
56 struct twl4030_codec *codec = platform_get_drvdata(twl4030_codec_dev);
57 u8 val;
58
Stephen Rothwell8bea8672009-12-15 16:33:10 +110059 twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, &val,
Peter Ujfalusi0b83dde2009-10-22 13:26:45 +030060 codec->resource[id].reg);
61
62 if (enable)
63 val |= codec->resource[id].mask;
64 else
65 val &= ~codec->resource[id].mask;
66
Stephen Rothwell8bea8672009-12-15 16:33:10 +110067 twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
Peter Ujfalusi0b83dde2009-10-22 13:26:45 +030068 val, codec->resource[id].reg);
69
70 return val;
71}
72
73static inline int twl4030_codec_get_resource(enum twl4030_codec_res id)
74{
75 struct twl4030_codec *codec = platform_get_drvdata(twl4030_codec_dev);
76 u8 val;
77
Stephen Rothwell8bea8672009-12-15 16:33:10 +110078 twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, &val,
Peter Ujfalusi0b83dde2009-10-22 13:26:45 +030079 codec->resource[id].reg);
80
81 return val;
82}
83
84/*
85 * Enable the resource.
86 * The function returns with error or the content of the register
87 */
88int twl4030_codec_enable_resource(enum twl4030_codec_res id)
89{
90 struct twl4030_codec *codec = platform_get_drvdata(twl4030_codec_dev);
91 int val;
92
93 if (id >= TWL4030_CODEC_RES_MAX) {
94 dev_err(&twl4030_codec_dev->dev,
95 "Invalid resource ID (%u)\n", id);
96 return -EINVAL;
97 }
98
99 mutex_lock(&codec->mutex);
100 if (!codec->resource[id].request_count)
101 /* Resource was disabled, enable it */
102 val = twl4030_codec_set_resource(id, 1);
103 else
104 val = twl4030_codec_get_resource(id);
105
106 codec->resource[id].request_count++;
107 mutex_unlock(&codec->mutex);
108
109 return val;
110}
111EXPORT_SYMBOL_GPL(twl4030_codec_enable_resource);
112
113/*
114 * Disable the resource.
115 * The function returns with error or the content of the register
116 */
117int twl4030_codec_disable_resource(unsigned id)
118{
119 struct twl4030_codec *codec = platform_get_drvdata(twl4030_codec_dev);
120 int val;
121
122 if (id >= TWL4030_CODEC_RES_MAX) {
123 dev_err(&twl4030_codec_dev->dev,
124 "Invalid resource ID (%u)\n", id);
125 return -EINVAL;
126 }
127
128 mutex_lock(&codec->mutex);
129 if (!codec->resource[id].request_count) {
130 dev_err(&twl4030_codec_dev->dev,
131 "Resource has been disabled already (%u)\n", id);
132 mutex_unlock(&codec->mutex);
133 return -EPERM;
134 }
135 codec->resource[id].request_count--;
136
137 if (!codec->resource[id].request_count)
138 /* Resource can be disabled now */
139 val = twl4030_codec_set_resource(id, 0);
140 else
141 val = twl4030_codec_get_resource(id);
142
143 mutex_unlock(&codec->mutex);
144
145 return val;
146}
147EXPORT_SYMBOL_GPL(twl4030_codec_disable_resource);
148
Peter Ujfalusif9b46392009-11-04 09:58:19 +0200149unsigned int twl4030_codec_get_mclk(void)
150{
151 struct twl4030_codec *codec = platform_get_drvdata(twl4030_codec_dev);
152
153 return codec->audio_mclk;
154}
155EXPORT_SYMBOL_GPL(twl4030_codec_get_mclk);
156
Peter Ujfalusi0b83dde2009-10-22 13:26:45 +0300157static int __devinit twl4030_codec_probe(struct platform_device *pdev)
158{
159 struct twl4030_codec *codec;
160 struct twl4030_codec_data *pdata = pdev->dev.platform_data;
161 struct mfd_cell *cell = NULL;
162 int ret, childs = 0;
Peter Ujfalusif9b46392009-11-04 09:58:19 +0200163 u8 val;
164
165 if (!pdata) {
166 dev_err(&pdev->dev, "Platform data is missing\n");
167 return -EINVAL;
168 }
169
170 /* Configure APLL_INFREQ and disable APLL if enabled */
171 val = 0;
172 switch (pdata->audio_mclk) {
173 case 19200000:
174 val |= TWL4030_APLL_INFREQ_19200KHZ;
175 break;
176 case 26000000:
177 val |= TWL4030_APLL_INFREQ_26000KHZ;
178 break;
179 case 38400000:
180 val |= TWL4030_APLL_INFREQ_38400KHZ;
181 break;
182 default:
183 dev_err(&pdev->dev, "Invalid audio_mclk\n");
184 return -EINVAL;
185 }
Stephen Rothwell8bea8672009-12-15 16:33:10 +1100186 twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
Peter Ujfalusif9b46392009-11-04 09:58:19 +0200187 val, TWL4030_REG_APLL_CTL);
Peter Ujfalusi0b83dde2009-10-22 13:26:45 +0300188
189 codec = kzalloc(sizeof(struct twl4030_codec), GFP_KERNEL);
190 if (!codec)
191 return -ENOMEM;
192
193 platform_set_drvdata(pdev, codec);
194
195 twl4030_codec_dev = pdev;
196 mutex_init(&codec->mutex);
Peter Ujfalusif9b46392009-11-04 09:58:19 +0200197 codec->audio_mclk = pdata->audio_mclk;
Peter Ujfalusi0b83dde2009-10-22 13:26:45 +0300198
199 /* Codec power */
200 codec->resource[TWL4030_CODEC_RES_POWER].reg = TWL4030_REG_CODEC_MODE;
201 codec->resource[TWL4030_CODEC_RES_POWER].mask = TWL4030_CODECPDZ;
202
203 /* PLL */
204 codec->resource[TWL4030_CODEC_RES_APLL].reg = TWL4030_REG_APLL_CTL;
205 codec->resource[TWL4030_CODEC_RES_APLL].mask = TWL4030_APLL_EN;
206
207 if (pdata->audio) {
208 cell = &codec->cells[childs];
209 cell->name = "twl4030_codec_audio";
210 cell->platform_data = pdata->audio;
211 cell->data_size = sizeof(*pdata->audio);
212 childs++;
213 }
214 if (pdata->vibra) {
215 cell = &codec->cells[childs];
216 cell->name = "twl4030_codec_vibra";
217 cell->platform_data = pdata->vibra;
218 cell->data_size = sizeof(*pdata->vibra);
219 childs++;
220 }
221
222 if (childs)
223 ret = mfd_add_devices(&pdev->dev, pdev->id, codec->cells,
224 childs, NULL, 0);
225 else {
226 dev_err(&pdev->dev, "No platform data found for childs\n");
227 ret = -ENODEV;
228 }
229
230 if (!ret)
231 return 0;
232
233 platform_set_drvdata(pdev, NULL);
234 kfree(codec);
235 twl4030_codec_dev = NULL;
236 return ret;
237}
238
239static int __devexit twl4030_codec_remove(struct platform_device *pdev)
240{
241 struct twl4030_codec *codec = platform_get_drvdata(pdev);
242
243 mfd_remove_devices(&pdev->dev);
244 platform_set_drvdata(pdev, NULL);
245 kfree(codec);
246 twl4030_codec_dev = NULL;
247
248 return 0;
249}
250
251MODULE_ALIAS("platform:twl4030_codec");
252
253static struct platform_driver twl4030_codec_driver = {
254 .probe = twl4030_codec_probe,
255 .remove = __devexit_p(twl4030_codec_remove),
256 .driver = {
257 .owner = THIS_MODULE,
258 .name = "twl4030_codec",
259 },
260};
261
262static int __devinit twl4030_codec_init(void)
263{
264 return platform_driver_register(&twl4030_codec_driver);
265}
266module_init(twl4030_codec_init);
267
268static void __devexit twl4030_codec_exit(void)
269{
270 platform_driver_unregister(&twl4030_codec_driver);
271}
272module_exit(twl4030_codec_exit);
273
274MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@nokia.com>");
275MODULE_LICENSE("GPL");
276