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 
25 static struct platform_device *twl4030_audio_dev;
26 
27 struct twl4030_audio_resource {
28 	int request_count;
29 	u8 reg;
30 	u8 mask;
31 };
32 
33 struct 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  */
twl4030_audio_set_resource(enum twl4030_audio_res id,int enable)44 static 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 
twl4030_audio_get_resource(enum twl4030_audio_res id)63 static 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  */
twl4030_audio_enable_resource(enum twl4030_audio_res id)78 int 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 }
101 EXPORT_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  */
twl4030_audio_disable_resource(enum twl4030_audio_res id)107 int 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 }
137 EXPORT_SYMBOL_GPL(twl4030_audio_disable_resource);
138 
twl4030_audio_get_mclk(void)139 unsigned 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 }
145 EXPORT_SYMBOL_GPL(twl4030_audio_get_mclk);
146 
twl4030_audio_has_codec(struct twl4030_audio_data * pdata,struct device_node * parent)147 static 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 
twl4030_audio_has_vibra(struct twl4030_audio_data * pdata,struct device_node * node)164 static 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 
twl4030_audio_probe(struct platform_device * pdev)178 static 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 
twl4030_audio_remove(struct platform_device * pdev)261 static int twl4030_audio_remove(struct platform_device *pdev)
262 {
263 	mfd_remove_devices(&pdev->dev);
264 	twl4030_audio_dev = NULL;
265 
266 	return 0;
267 }
268 
269 static const struct of_device_id twl4030_audio_of_match[] = {
270 	{.compatible = "ti,twl4030-audio", },
271 	{ },
272 };
273 MODULE_DEVICE_TABLE(of, twl4030_audio_of_match);
274 
275 static struct platform_driver twl4030_audio_driver = {
276 	.driver		= {
277 		.name	= "twl4030-audio",
278 		.of_match_table = twl4030_audio_of_match,
279 	},
280 	.probe		= twl4030_audio_probe,
281 	.remove		= twl4030_audio_remove,
282 };
283 
284 module_platform_driver(twl4030_audio_driver);
285 
286 MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
287 MODULE_DESCRIPTION("TWL4030 audio block MFD driver");
288 MODULE_LICENSE("GPL");
289 MODULE_ALIAS("platform:twl4030-audio");
290