2 * MFD driver for twl4030 audio submodule, which contains an audio codec, and
5 * Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
7 * Copyright: (C) 2009 Nokia Corporation
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.
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.
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
25 #include <linux/module.h>
26 #include <linux/types.h>
27 #include <linux/slab.h>
28 #include <linux/kernel.h>
30 #include <linux/platform_device.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>
37 #define TWL4030_AUDIO_CELLS 2
39 static struct platform_device *twl4030_audio_dev;
41 struct twl4030_audio_resource {
47 struct twl4030_audio {
48 unsigned int audio_mclk;
50 struct twl4030_audio_resource resource[TWL4030_AUDIO_RES_MAX];
51 struct mfd_cell cells[TWL4030_AUDIO_CELLS];
55 * Modify the resource, the function returns the content of the register
56 * after the modification.
58 static int twl4030_audio_set_resource(enum twl4030_audio_res id, int enable)
60 struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev);
63 twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, &val,
64 audio->resource[id].reg);
67 val |= audio->resource[id].mask;
69 val &= ~audio->resource[id].mask;
71 twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
72 val, audio->resource[id].reg);
77 static inline int twl4030_audio_get_resource(enum twl4030_audio_res id)
79 struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev);
82 twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, &val,
83 audio->resource[id].reg);
89 * Enable the resource.
90 * The function returns with error or the content of the register
92 int twl4030_audio_enable_resource(enum twl4030_audio_res id)
94 struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev);
97 if (id >= TWL4030_AUDIO_RES_MAX) {
98 dev_err(&twl4030_audio_dev->dev,
99 "Invalid resource ID (%u)\n", id);
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);
108 val = twl4030_audio_get_resource(id);
110 audio->resource[id].request_count++;
111 mutex_unlock(&audio->mutex);
115 EXPORT_SYMBOL_GPL(twl4030_audio_enable_resource);
118 * Disable the resource.
119 * The function returns with error or the content of the register
121 int twl4030_audio_disable_resource(enum twl4030_audio_res id)
123 struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev);
126 if (id >= TWL4030_AUDIO_RES_MAX) {
127 dev_err(&twl4030_audio_dev->dev,
128 "Invalid resource ID (%u)\n", id);
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);
139 audio->resource[id].request_count--;
141 if (!audio->resource[id].request_count)
142 /* Resource can be disabled now */
143 val = twl4030_audio_set_resource(id, 0);
145 val = twl4030_audio_get_resource(id);
147 mutex_unlock(&audio->mutex);
151 EXPORT_SYMBOL_GPL(twl4030_audio_disable_resource);
153 unsigned int twl4030_audio_get_mclk(void)
155 struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev);
157 return audio->audio_mclk;
159 EXPORT_SYMBOL_GPL(twl4030_audio_get_mclk);
161 static bool twl4030_audio_has_codec(struct twl4030_audio_data *pdata,
162 struct device_node *node)
164 if (pdata && pdata->codec)
167 if (of_find_node_by_name(node, "codec"))
173 static bool twl4030_audio_has_vibra(struct twl4030_audio_data *pdata,
174 struct device_node *node)
178 if (pdata && pdata->vibra)
181 if (!of_property_read_u32(node, "ti,enable-vibra", &vibra) && vibra)
187 static int twl4030_audio_probe(struct platform_device *pdev)
189 struct twl4030_audio *audio;
190 struct twl4030_audio_data *pdata = pdev->dev.platform_data;
191 struct device_node *node = pdev->dev.of_node;
192 struct mfd_cell *cell = NULL;
196 if (!pdata && !node) {
197 dev_err(&pdev->dev, "Platform data is missing\n");
201 audio = devm_kzalloc(&pdev->dev, sizeof(struct twl4030_audio),
206 mutex_init(&audio->mutex);
207 audio->audio_mclk = twl_get_hfclk_rate();
209 /* Configure APLL_INFREQ and disable APLL if enabled */
210 switch (audio->audio_mclk) {
212 val = TWL4030_APLL_INFREQ_19200KHZ;
215 val = TWL4030_APLL_INFREQ_26000KHZ;
218 val = TWL4030_APLL_INFREQ_38400KHZ;
221 dev_err(&pdev->dev, "Invalid audio_mclk\n");
224 twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE, val, TWL4030_REG_APLL_CTL);
227 audio->resource[TWL4030_AUDIO_RES_POWER].reg = TWL4030_REG_CODEC_MODE;
228 audio->resource[TWL4030_AUDIO_RES_POWER].mask = TWL4030_CODECPDZ;
231 audio->resource[TWL4030_AUDIO_RES_APLL].reg = TWL4030_REG_APLL_CTL;
232 audio->resource[TWL4030_AUDIO_RES_APLL].mask = TWL4030_APLL_EN;
234 if (twl4030_audio_has_codec(pdata, node)) {
235 cell = &audio->cells[childs];
236 cell->name = "twl4030-codec";
238 cell->platform_data = pdata->codec;
239 cell->pdata_size = sizeof(*pdata->codec);
243 if (twl4030_audio_has_vibra(pdata, node)) {
244 cell = &audio->cells[childs];
245 cell->name = "twl4030-vibra";
247 cell->platform_data = pdata->vibra;
248 cell->pdata_size = sizeof(*pdata->vibra);
253 platform_set_drvdata(pdev, audio);
254 twl4030_audio_dev = pdev;
257 ret = mfd_add_devices(&pdev->dev, pdev->id, audio->cells,
258 childs, NULL, 0, NULL);
260 dev_err(&pdev->dev, "No platform data found for childs\n");
265 platform_set_drvdata(pdev, NULL);
266 twl4030_audio_dev = NULL;
272 static int twl4030_audio_remove(struct platform_device *pdev)
274 mfd_remove_devices(&pdev->dev);
275 platform_set_drvdata(pdev, NULL);
276 twl4030_audio_dev = NULL;
281 static const struct of_device_id twl4030_audio_of_match[] = {
282 {.compatible = "ti,twl4030-audio", },
285 MODULE_DEVICE_TABLE(of, twl4030_audio_of_match);
287 static struct platform_driver twl4030_audio_driver = {
289 .owner = THIS_MODULE,
290 .name = "twl4030-audio",
291 .of_match_table = twl4030_audio_of_match,
293 .probe = twl4030_audio_probe,
294 .remove = twl4030_audio_remove,
297 module_platform_driver(twl4030_audio_driver);
299 MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
300 MODULE_DESCRIPTION("TWL4030 audio block MFD driver");
301 MODULE_LICENSE("GPL");
302 MODULE_ALIAS("platform:twl4030-audio");