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/i2c/twl.h>
32#include <linux/mfd/core.h>
33#include <linux/mfd/twl4030-audio.h>
34
35#define TWL4030_AUDIO_CELLS	2
36
37static struct platform_device *twl4030_audio_dev;
38
39struct twl4030_audio_resource {
40	int request_count;
41	u8 reg;
42	u8 mask;
43};
44
45struct twl4030_audio {
46	unsigned int audio_mclk;
47	struct mutex mutex;
48	struct twl4030_audio_resource resource[TWL4030_AUDIO_RES_MAX];
49	struct mfd_cell cells[TWL4030_AUDIO_CELLS];
50};
51
52/*
53 * Modify the resource, the function returns the content of the register
54 * after the modification.
55 */
56static int twl4030_audio_set_resource(enum twl4030_audio_res id, int enable)
57{
58	struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev);
59	u8 val;
60
61	twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, &val,
62			audio->resource[id].reg);
63
64	if (enable)
65		val |= audio->resource[id].mask;
66	else
67		val &= ~audio->resource[id].mask;
68
69	twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
70					val, audio->resource[id].reg);
71
72	return val;
73}
74
75static inline int twl4030_audio_get_resource(enum twl4030_audio_res id)
76{
77	struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev);
78	u8 val;
79
80	twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, &val,
81			audio->resource[id].reg);
82
83	return val;
84}
85
86/*
87 * Enable the resource.
88 * The function returns with error or the content of the register
89 */
90int twl4030_audio_enable_resource(enum twl4030_audio_res id)
91{
92	struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev);
93	int val;
94
95	if (id >= TWL4030_AUDIO_RES_MAX) {
96		dev_err(&twl4030_audio_dev->dev,
97				"Invalid resource ID (%u)\n", id);
98		return -EINVAL;
99	}
100
101	mutex_lock(&audio->mutex);
102	if (!audio->resource[id].request_count)
103		/* Resource was disabled, enable it */
104		val = twl4030_audio_set_resource(id, 1);
105	else
106		val = twl4030_audio_get_resource(id);
107
108	audio->resource[id].request_count++;
109	mutex_unlock(&audio->mutex);
110
111	return val;
112}
113EXPORT_SYMBOL_GPL(twl4030_audio_enable_resource);
114
115/*
116 * Disable the resource.
117 * The function returns with error or the content of the register
118 */
119int twl4030_audio_disable_resource(unsigned id)
120{
121	struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev);
122	int val;
123
124	if (id >= TWL4030_AUDIO_RES_MAX) {
125		dev_err(&twl4030_audio_dev->dev,
126				"Invalid resource ID (%u)\n", id);
127		return -EINVAL;
128	}
129
130	mutex_lock(&audio->mutex);
131	if (!audio->resource[id].request_count) {
132		dev_err(&twl4030_audio_dev->dev,
133			"Resource has been disabled already (%u)\n", id);
134		mutex_unlock(&audio->mutex);
135		return -EPERM;
136	}
137	audio->resource[id].request_count--;
138
139	if (!audio->resource[id].request_count)
140		/* Resource can be disabled now */
141		val = twl4030_audio_set_resource(id, 0);
142	else
143		val = twl4030_audio_get_resource(id);
144
145	mutex_unlock(&audio->mutex);
146
147	return val;
148}
149EXPORT_SYMBOL_GPL(twl4030_audio_disable_resource);
150
151unsigned int twl4030_audio_get_mclk(void)
152{
153	struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev);
154
155	return audio->audio_mclk;
156}
157EXPORT_SYMBOL_GPL(twl4030_audio_get_mclk);
158
159static int __devinit twl4030_audio_probe(struct platform_device *pdev)
160{
161	struct twl4030_audio *audio;
162	struct twl4030_audio_data *pdata = pdev->dev.platform_data;
163	struct mfd_cell *cell = NULL;
164	int ret, childs = 0;
165	u8 val;
166
167	if (!pdata) {
168		dev_err(&pdev->dev, "Platform data is missing\n");
169		return -EINVAL;
170	}
171
172	/* Configure APLL_INFREQ and disable APLL if enabled */
173	val = 0;
174	switch (pdata->audio_mclk) {
175	case 19200000:
176		val |= TWL4030_APLL_INFREQ_19200KHZ;
177		break;
178	case 26000000:
179		val |= TWL4030_APLL_INFREQ_26000KHZ;
180		break;
181	case 38400000:
182		val |= TWL4030_APLL_INFREQ_38400KHZ;
183		break;
184	default:
185		dev_err(&pdev->dev, "Invalid audio_mclk\n");
186		return -EINVAL;
187	}
188	twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
189					val, TWL4030_REG_APLL_CTL);
190
191	audio = kzalloc(sizeof(struct twl4030_audio), GFP_KERNEL);
192	if (!audio)
193		return -ENOMEM;
194
195	platform_set_drvdata(pdev, audio);
196
197	twl4030_audio_dev = pdev;
198	mutex_init(&audio->mutex);
199	audio->audio_mclk = pdata->audio_mclk;
200
201	/* Codec power */
202	audio->resource[TWL4030_AUDIO_RES_POWER].reg = TWL4030_REG_CODEC_MODE;
203	audio->resource[TWL4030_AUDIO_RES_POWER].mask = TWL4030_CODECPDZ;
204
205	/* PLL */
206	audio->resource[TWL4030_AUDIO_RES_APLL].reg = TWL4030_REG_APLL_CTL;
207	audio->resource[TWL4030_AUDIO_RES_APLL].mask = TWL4030_APLL_EN;
208
209	if (pdata->codec) {
210		cell = &audio->cells[childs];
211		cell->name = "twl4030-codec";
212		cell->platform_data = pdata->codec;
213		cell->pdata_size = sizeof(*pdata->codec);
214		childs++;
215	}
216	if (pdata->vibra) {
217		cell = &audio->cells[childs];
218		cell->name = "twl4030-vibra";
219		cell->platform_data = pdata->vibra;
220		cell->pdata_size = sizeof(*pdata->vibra);
221		childs++;
222	}
223
224	if (childs)
225		ret = mfd_add_devices(&pdev->dev, pdev->id, audio->cells,
226				      childs, NULL, 0);
227	else {
228		dev_err(&pdev->dev, "No platform data found for childs\n");
229		ret = -ENODEV;
230	}
231
232	if (!ret)
233		return 0;
234
235	platform_set_drvdata(pdev, NULL);
236	kfree(audio);
237	twl4030_audio_dev = NULL;
238	return ret;
239}
240
241static int __devexit twl4030_audio_remove(struct platform_device *pdev)
242{
243	struct twl4030_audio *audio = platform_get_drvdata(pdev);
244
245	mfd_remove_devices(&pdev->dev);
246	platform_set_drvdata(pdev, NULL);
247	kfree(audio);
248	twl4030_audio_dev = NULL;
249
250	return 0;
251}
252
253MODULE_ALIAS("platform:twl4030-audio");
254
255static struct platform_driver twl4030_audio_driver = {
256	.probe		= twl4030_audio_probe,
257	.remove		= __devexit_p(twl4030_audio_remove),
258	.driver		= {
259		.owner	= THIS_MODULE,
260		.name	= "twl4030-audio",
261	},
262};
263
264module_platform_driver(twl4030_audio_driver);
265
266MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
267MODULE_LICENSE("GPL");
268