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_ALIAS("platform:twl4030-audio");
289