1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * MFD driver for twl4030 audio submodule, which contains an audio codec, and
4 * the vibra control.
5 *
6 * Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
7 *
8 * Copyright:   (C) 2009 Nokia Corporation
9 */
10
11#include <linux/module.h>
12#include <linux/types.h>
13#include <linux/slab.h>
14#include <linux/kernel.h>
15#include <linux/fs.h>
16#include <linux/platform_device.h>
17#include <linux/of.h>
18#include <linux/of_platform.h>
19#include <linux/mfd/twl.h>
20#include <linux/mfd/core.h>
21#include <linux/mfd/twl4030-audio.h>
22
23#define TWL4030_AUDIO_CELLS	2
24
25static struct platform_device *twl4030_audio_dev;
26
27struct twl4030_audio_resource {
28	int request_count;
29	u8 reg;
30	u8 mask;
31};
32
33struct twl4030_audio {
34	unsigned int audio_mclk;
35	struct mutex mutex;
36	struct twl4030_audio_resource resource[TWL4030_AUDIO_RES_MAX];
37	struct mfd_cell cells[TWL4030_AUDIO_CELLS];
38};
39
40/*
41 * Modify the resource, the function returns the content of the register
42 * after the modification.
43 */
44static int twl4030_audio_set_resource(enum twl4030_audio_res id, int enable)
45{
46	struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev);
47	u8 val;
48
49	twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, &val,
50			audio->resource[id].reg);
51
52	if (enable)
53		val |= audio->resource[id].mask;
54	else
55		val &= ~audio->resource[id].mask;
56
57	twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
58					val, audio->resource[id].reg);
59
60	return val;
61}
62
63static inline int twl4030_audio_get_resource(enum twl4030_audio_res id)
64{
65	struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev);
66	u8 val;
67
68	twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, &val,
69			audio->resource[id].reg);
70
71	return val;
72}
73
74/*
75 * Enable the resource.
76 * The function returns with error or the content of the register
77 */
78int twl4030_audio_enable_resource(enum twl4030_audio_res id)
79{
80	struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev);
81	int val;
82
83	if (id >= TWL4030_AUDIO_RES_MAX) {
84		dev_err(&twl4030_audio_dev->dev,
85				"Invalid resource ID (%u)\n", id);
86		return -EINVAL;
87	}
88
89	mutex_lock(&audio->mutex);
90	if (!audio->resource[id].request_count)
91		/* Resource was disabled, enable it */
92		val = twl4030_audio_set_resource(id, 1);
93	else
94		val = twl4030_audio_get_resource(id);
95
96	audio->resource[id].request_count++;
97	mutex_unlock(&audio->mutex);
98
99	return val;
100}
101EXPORT_SYMBOL_GPL(twl4030_audio_enable_resource);
102
103/*
104 * Disable the resource.
105 * The function returns with error or the content of the register
106 */
107int twl4030_audio_disable_resource(enum twl4030_audio_res id)
108{
109	struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev);
110	int val;
111
112	if (id >= TWL4030_AUDIO_RES_MAX) {
113		dev_err(&twl4030_audio_dev->dev,
114				"Invalid resource ID (%u)\n", id);
115		return -EINVAL;
116	}
117
118	mutex_lock(&audio->mutex);
119	if (!audio->resource[id].request_count) {
120		dev_err(&twl4030_audio_dev->dev,
121			"Resource has been disabled already (%u)\n", id);
122		mutex_unlock(&audio->mutex);
123		return -EPERM;
124	}
125	audio->resource[id].request_count--;
126
127	if (!audio->resource[id].request_count)
128		/* Resource can be disabled now */
129		val = twl4030_audio_set_resource(id, 0);
130	else
131		val = twl4030_audio_get_resource(id);
132
133	mutex_unlock(&audio->mutex);
134
135	return val;
136}
137EXPORT_SYMBOL_GPL(twl4030_audio_disable_resource);
138
139unsigned int twl4030_audio_get_mclk(void)
140{
141	struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev);
142
143	return audio->audio_mclk;
144}
145EXPORT_SYMBOL_GPL(twl4030_audio_get_mclk);
146
147static bool twl4030_audio_has_codec(struct twl4030_audio_data *pdata,
148			      struct device_node *parent)
149{
150	struct device_node *node;
151
152	if (pdata && pdata->codec)
153		return true;
154
155	node = of_get_child_by_name(parent, "codec");
156	if (node) {
157		of_node_put(node);
158		return true;
159	}
160
161	return false;
162}
163
164static bool twl4030_audio_has_vibra(struct twl4030_audio_data *pdata,
165			      struct device_node *node)
166{
167	int vibra;
168
169	if (pdata && pdata->vibra)
170		return true;
171
172	if (!of_property_read_u32(node, "ti,enable-vibra", &vibra) && vibra)
173		return true;
174
175	return false;
176}
177
178static int twl4030_audio_probe(struct platform_device *pdev)
179{
180	struct twl4030_audio *audio;
181	struct twl4030_audio_data *pdata = dev_get_platdata(&pdev->dev);
182	struct device_node *node = pdev->dev.of_node;
183	struct mfd_cell *cell = NULL;
184	int ret, childs = 0;
185	u8 val;
186
187	if (!pdata && !node) {
188		dev_err(&pdev->dev, "Platform data is missing\n");
189		return -EINVAL;
190	}
191
192	audio = devm_kzalloc(&pdev->dev, sizeof(struct twl4030_audio),
193			     GFP_KERNEL);
194	if (!audio)
195		return -ENOMEM;
196
197	mutex_init(&audio->mutex);
198	audio->audio_mclk = twl_get_hfclk_rate();
199
200	/* Configure APLL_INFREQ and disable APLL if enabled */
201	switch (audio->audio_mclk) {
202	case 19200000:
203		val = TWL4030_APLL_INFREQ_19200KHZ;
204		break;
205	case 26000000:
206		val = TWL4030_APLL_INFREQ_26000KHZ;
207		break;
208	case 38400000:
209		val = TWL4030_APLL_INFREQ_38400KHZ;
210		break;
211	default:
212		dev_err(&pdev->dev, "Invalid audio_mclk\n");
213		return -EINVAL;
214	}
215	twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE, val, TWL4030_REG_APLL_CTL);
216
217	/* Codec power */
218	audio->resource[TWL4030_AUDIO_RES_POWER].reg = TWL4030_REG_CODEC_MODE;
219	audio->resource[TWL4030_AUDIO_RES_POWER].mask = TWL4030_CODECPDZ;
220
221	/* PLL */
222	audio->resource[TWL4030_AUDIO_RES_APLL].reg = TWL4030_REG_APLL_CTL;
223	audio->resource[TWL4030_AUDIO_RES_APLL].mask = TWL4030_APLL_EN;
224
225	if (twl4030_audio_has_codec(pdata, node)) {
226		cell = &audio->cells[childs];
227		cell->name = "twl4030-codec";
228		if (pdata) {
229			cell->platform_data = pdata->codec;
230			cell->pdata_size = sizeof(*pdata->codec);
231		}
232		childs++;
233	}
234	if (twl4030_audio_has_vibra(pdata, node)) {
235		cell = &audio->cells[childs];
236		cell->name = "twl4030-vibra";
237		if (pdata) {
238			cell->platform_data = pdata->vibra;
239			cell->pdata_size = sizeof(*pdata->vibra);
240		}
241		childs++;
242	}
243
244	platform_set_drvdata(pdev, audio);
245	twl4030_audio_dev = pdev;
246
247	if (childs)
248		ret = mfd_add_devices(&pdev->dev, pdev->id, audio->cells,
249				      childs, NULL, 0, NULL);
250	else {
251		dev_err(&pdev->dev, "No platform data found for childs\n");
252		ret = -ENODEV;
253	}
254
255	if (ret)
256		twl4030_audio_dev = NULL;
257
258	return ret;
259}
260
261static void twl4030_audio_remove(struct platform_device *pdev)
262{
263	mfd_remove_devices(&pdev->dev);
264	twl4030_audio_dev = NULL;
265}
266
267static const struct of_device_id twl4030_audio_of_match[] = {
268	{.compatible = "ti,twl4030-audio", },
269	{ },
270};
271MODULE_DEVICE_TABLE(of, twl4030_audio_of_match);
272
273static struct platform_driver twl4030_audio_driver = {
274	.driver		= {
275		.name	= "twl4030-audio",
276		.of_match_table = twl4030_audio_of_match,
277	},
278	.probe		= twl4030_audio_probe,
279	.remove_new	= twl4030_audio_remove,
280};
281
282module_platform_driver(twl4030_audio_driver);
283
284MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
285MODULE_DESCRIPTION("TWL4030 audio block MFD driver");
286MODULE_ALIAS("platform:twl4030-audio");
287