1/*
2 * MFD driver for twl4030 audio submodule, which contains an audio codec, and
3 * the vibra control.
4 *
5 * Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
6 *
7 * Copyright: (C) 2009 Nokia Corporation
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
21 * 02110-1301 USA
22 *
23 */
24
25#include <linux/module.h>
26#include <linux/types.h>
27#include <linux/slab.h>
28#include <linux/kernel.h>
29#include <linux/fs.h>
30#include <linux/platform_device.h>
31#include <linux/of.h>
32#include <linux/of_platform.h>
33#include <linux/mfd/twl.h>
34#include <linux/mfd/core.h>
35#include <linux/mfd/twl4030-audio.h>
36
37#define TWL4030_AUDIO_CELLS 2
38
39static struct platform_device *twl4030_audio_dev;
40
41struct twl4030_audio_resource {
42 int request_count;
43 u8 reg;
44 u8 mask;
45};
46
47struct twl4030_audio {
48 unsigned int audio_mclk;
49 struct mutex mutex;
50 struct twl4030_audio_resource resource[TWL4030_AUDIO_RES_MAX];
51 struct mfd_cell cells[TWL4030_AUDIO_CELLS];
52};
53
54/*
55 * Modify the resource, the function returns the content of the register
56 * after the modification.
57 */
58static int twl4030_audio_set_resource(enum twl4030_audio_res id, int enable)
59{
60 struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev);
61 u8 val;
62
63 twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, &val,
64 audio->resource[id].reg);
65
66 if (enable)
67 val |= audio->resource[id].mask;
68 else
69 val &= ~audio->resource[id].mask;
70
71 twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
72 val, audio->resource[id].reg);
73
74 return val;
75}
76
77static inline int twl4030_audio_get_resource(enum twl4030_audio_res id)
78{
79 struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev);
80 u8 val;
81
82 twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, &val,
83 audio->resource[id].reg);
84
85 return val;
86}
87
88/*
89 * Enable the resource.
90 * The function returns with error or the content of the register
91 */
92int twl4030_audio_enable_resource(enum twl4030_audio_res id)
93{
94 struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev);
95 int val;
96
97 if (id >= TWL4030_AUDIO_RES_MAX) {
98 dev_err(&twl4030_audio_dev->dev,
99 "Invalid resource ID (%u)\n", id);
100 return -EINVAL;
101 }
102
103 mutex_lock(&audio->mutex);
104 if (!audio->resource[id].request_count)
105 /* Resource was disabled, enable it */
106 val = twl4030_audio_set_resource(id, 1);
107 else
108 val = twl4030_audio_get_resource(id);
109
110 audio->resource[id].request_count++;
111 mutex_unlock(&audio->mutex);
112
113 return val;
114}
115EXPORT_SYMBOL_GPL(twl4030_audio_enable_resource);
116
117/*
118 * Disable the resource.
119 * The function returns with error or the content of the register
120 */
121int twl4030_audio_disable_resource(enum twl4030_audio_res id)
122{
123 struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev);
124 int val;
125
126 if (id >= TWL4030_AUDIO_RES_MAX) {
127 dev_err(&twl4030_audio_dev->dev,
128 "Invalid resource ID (%u)\n", id);
129 return -EINVAL;
130 }
131
132 mutex_lock(&audio->mutex);
133 if (!audio->resource[id].request_count) {
134 dev_err(&twl4030_audio_dev->dev,
135 "Resource has been disabled already (%u)\n", id);
136 mutex_unlock(&audio->mutex);
137 return -EPERM;
138 }
139 audio->resource[id].request_count--;
140
141 if (!audio->resource[id].request_count)
142 /* Resource can be disabled now */
143 val = twl4030_audio_set_resource(id, 0);
144 else
145 val = twl4030_audio_get_resource(id);
146
147 mutex_unlock(&audio->mutex);
148
149 return val;
150}
151EXPORT_SYMBOL_GPL(twl4030_audio_disable_resource);
152
153unsigned int twl4030_audio_get_mclk(void)
154{
155 struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev);
156
157 return audio->audio_mclk;
158}
159EXPORT_SYMBOL_GPL(twl4030_audio_get_mclk);
160
161static bool twl4030_audio_has_codec(struct twl4030_audio_data *pdata,
162 struct device_node *parent)
163{
164 struct device_node *node;
165
166 if (pdata && pdata->codec)
167 return true;
168
169 node = of_get_child_by_name(parent, "codec");
170 if (node) {
171 of_node_put(node);
172 return true;
173 }
174
175 return false;
176}
177
178static bool twl4030_audio_has_vibra(struct twl4030_audio_data *pdata,
179 struct device_node *node)
180{
181 int vibra;
182
183 if (pdata && pdata->vibra)
184 return true;
185
186 if (!of_property_read_u32(node, "ti,enable-vibra", &vibra) && vibra)
187 return true;
188
189 return false;
190}
191
192static int twl4030_audio_probe(struct platform_device *pdev)
193{
194 struct twl4030_audio *audio;
195 struct twl4030_audio_data *pdata = dev_get_platdata(&pdev->dev);
196 struct device_node *node = pdev->dev.of_node;
197 struct mfd_cell *cell = NULL;
198 int ret, childs = 0;
199 u8 val;
200
201 if (!pdata && !node) {
202 dev_err(&pdev->dev, "Platform data is missing\n");
203 return -EINVAL;
204 }
205
206 audio = devm_kzalloc(&pdev->dev, sizeof(struct twl4030_audio),
207 GFP_KERNEL);
208 if (!audio)
209 return -ENOMEM;
210
211 mutex_init(&audio->mutex);
212 audio->audio_mclk = twl_get_hfclk_rate();
213
214 /* Configure APLL_INFREQ and disable APLL if enabled */
215 switch (audio->audio_mclk) {
216 case 19200000:
217 val = TWL4030_APLL_INFREQ_19200KHZ;
218 break;
219 case 26000000:
220 val = TWL4030_APLL_INFREQ_26000KHZ;
221 break;
222 case 38400000:
223 val = TWL4030_APLL_INFREQ_38400KHZ;
224 break;
225 default:
226 dev_err(&pdev->dev, "Invalid audio_mclk\n");
227 return -EINVAL;
228 }
229 twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE, val, TWL4030_REG_APLL_CTL);
230
231 /* Codec power */
232 audio->resource[TWL4030_AUDIO_RES_POWER].reg = TWL4030_REG_CODEC_MODE;
233 audio->resource[TWL4030_AUDIO_RES_POWER].mask = TWL4030_CODECPDZ;
234
235 /* PLL */
236 audio->resource[TWL4030_AUDIO_RES_APLL].reg = TWL4030_REG_APLL_CTL;
237 audio->resource[TWL4030_AUDIO_RES_APLL].mask = TWL4030_APLL_EN;
238
239 if (twl4030_audio_has_codec(pdata, node)) {
240 cell = &audio->cells[childs];
241 cell->name = "twl4030-codec";
242 if (pdata) {
243 cell->platform_data = pdata->codec;
244 cell->pdata_size = sizeof(*pdata->codec);
245 }
246 childs++;
247 }
248 if (twl4030_audio_has_vibra(pdata, node)) {
249 cell = &audio->cells[childs];
250 cell->name = "twl4030-vibra";
251 if (pdata) {
252 cell->platform_data = pdata->vibra;
253 cell->pdata_size = sizeof(*pdata->vibra);
254 }
255 childs++;
256 }
257
258 platform_set_drvdata(pdev, audio);
259 twl4030_audio_dev = pdev;
260
261 if (childs)
262 ret = mfd_add_devices(&pdev->dev, pdev->id, audio->cells,
263 childs, NULL, 0, NULL);
264 else {
265 dev_err(&pdev->dev, "No platform data found for childs\n");
266 ret = -ENODEV;
267 }
268
269 if (ret)
270 twl4030_audio_dev = NULL;
271
272 return ret;
273}
274
275static int twl4030_audio_remove(struct platform_device *pdev)
276{
277 mfd_remove_devices(&pdev->dev);
278 twl4030_audio_dev = NULL;
279
280 return 0;
281}
282
283static const struct of_device_id twl4030_audio_of_match[] = {
284 {.compatible = "ti,twl4030-audio", },
285 { },
286};
287MODULE_DEVICE_TABLE(of, twl4030_audio_of_match);
288
289static struct platform_driver twl4030_audio_driver = {
290 .driver = {
291 .name = "twl4030-audio",
292 .of_match_table = twl4030_audio_of_match,
293 },
294 .probe = twl4030_audio_probe,
295 .remove = twl4030_audio_remove,
296};
297
298module_platform_driver(twl4030_audio_driver);
299
300MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
301MODULE_DESCRIPTION("TWL4030 audio block MFD driver");
302MODULE_LICENSE("GPL");
303MODULE_ALIAS("platform:twl4030-audio");
304