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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/i2c/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 *node)
163{
164	if (pdata && pdata->codec)
165		return true;
166
167	if (of_find_node_by_name(node, "codec"))
168		return true;
169
170	return false;
171}
172
173static bool twl4030_audio_has_vibra(struct twl4030_audio_data *pdata,
174			      struct device_node *node)
175{
176	int vibra;
177
178	if (pdata && pdata->vibra)
179		return true;
180
181	if (!of_property_read_u32(node, "ti,enable-vibra", &vibra) && vibra)
182		return true;
183
184	return false;
185}
186
187static int twl4030_audio_probe(struct platform_device *pdev)
188{
189	struct twl4030_audio *audio;
190	struct twl4030_audio_data *pdata = dev_get_platdata(&pdev->dev);
191	struct device_node *node = pdev->dev.of_node;
192	struct mfd_cell *cell = NULL;
193	int ret, childs = 0;
194	u8 val;
195
196	if (!pdata && !node) {
197		dev_err(&pdev->dev, "Platform data is missing\n");
198		return -EINVAL;
199	}
200
201	audio = devm_kzalloc(&pdev->dev, sizeof(struct twl4030_audio),
202			     GFP_KERNEL);
203	if (!audio)
204		return -ENOMEM;
205
206	mutex_init(&audio->mutex);
207	audio->audio_mclk = twl_get_hfclk_rate();
208
209	/* Configure APLL_INFREQ and disable APLL if enabled */
210	switch (audio->audio_mclk) {
211	case 19200000:
212		val = TWL4030_APLL_INFREQ_19200KHZ;
213		break;
214	case 26000000:
215		val = TWL4030_APLL_INFREQ_26000KHZ;
216		break;
217	case 38400000:
218		val = TWL4030_APLL_INFREQ_38400KHZ;
219		break;
220	default:
221		dev_err(&pdev->dev, "Invalid audio_mclk\n");
222		return -EINVAL;
223	}
224	twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE, val, TWL4030_REG_APLL_CTL);
225
226	/* Codec power */
227	audio->resource[TWL4030_AUDIO_RES_POWER].reg = TWL4030_REG_CODEC_MODE;
228	audio->resource[TWL4030_AUDIO_RES_POWER].mask = TWL4030_CODECPDZ;
229
230	/* PLL */
231	audio->resource[TWL4030_AUDIO_RES_APLL].reg = TWL4030_REG_APLL_CTL;
232	audio->resource[TWL4030_AUDIO_RES_APLL].mask = TWL4030_APLL_EN;
233
234	if (twl4030_audio_has_codec(pdata, node)) {
235		cell = &audio->cells[childs];
236		cell->name = "twl4030-codec";
237		if (pdata) {
238			cell->platform_data = pdata->codec;
239			cell->pdata_size = sizeof(*pdata->codec);
240		}
241		childs++;
242	}
243	if (twl4030_audio_has_vibra(pdata, node)) {
244		cell = &audio->cells[childs];
245		cell->name = "twl4030-vibra";
246		if (pdata) {
247			cell->platform_data = pdata->vibra;
248			cell->pdata_size = sizeof(*pdata->vibra);
249		}
250		childs++;
251	}
252
253	platform_set_drvdata(pdev, audio);
254	twl4030_audio_dev = pdev;
255
256	if (childs)
257		ret = mfd_add_devices(&pdev->dev, pdev->id, audio->cells,
258				      childs, NULL, 0, NULL);
259	else {
260		dev_err(&pdev->dev, "No platform data found for childs\n");
261		ret = -ENODEV;
262	}
263
264	if (ret)
265		twl4030_audio_dev = NULL;
266
267	return ret;
268}
269
270static int twl4030_audio_remove(struct platform_device *pdev)
271{
272	mfd_remove_devices(&pdev->dev);
273	twl4030_audio_dev = NULL;
274
275	return 0;
276}
277
278static const struct of_device_id twl4030_audio_of_match[] = {
279	{.compatible = "ti,twl4030-audio", },
280	{ },
281};
282MODULE_DEVICE_TABLE(of, twl4030_audio_of_match);
283
284static struct platform_driver twl4030_audio_driver = {
285	.driver		= {
286		.owner	= THIS_MODULE,
287		.name	= "twl4030-audio",
288		.of_match_table = twl4030_audio_of_match,
289	},
290	.probe		= twl4030_audio_probe,
291	.remove		= twl4030_audio_remove,
292};
293
294module_platform_driver(twl4030_audio_driver);
295
296MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
297MODULE_DESCRIPTION("TWL4030 audio block MFD driver");
298MODULE_LICENSE("GPL");
299MODULE_ALIAS("platform:twl4030-audio");
300