278 lines
6.7 KiB
C
278 lines
6.7 KiB
C
/*
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* MFD driver for twl4030 codec submodule
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*
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* Author: Peter Ujfalusi <peter.ujfalusi@nokia.com>
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*
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* Copyright: (C) 2009 Nokia Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/kernel.h>
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#include <linux/fs.h>
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#include <linux/platform_device.h>
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#include <linux/i2c/twl.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/twl4030-codec.h>
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#define TWL4030_CODEC_CELLS 2
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static struct platform_device *twl4030_codec_dev;
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struct twl4030_codec_resource {
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int request_count;
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u8 reg;
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u8 mask;
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};
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struct twl4030_codec {
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unsigned int audio_mclk;
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struct mutex mutex;
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struct twl4030_codec_resource resource[TWL4030_CODEC_RES_MAX];
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struct mfd_cell cells[TWL4030_CODEC_CELLS];
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};
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/*
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* Modify the resource, the function returns the content of the register
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* after the modification.
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*/
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static int twl4030_codec_set_resource(enum twl4030_codec_res id, int enable)
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{
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struct twl4030_codec *codec = platform_get_drvdata(twl4030_codec_dev);
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u8 val;
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twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, &val,
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codec->resource[id].reg);
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if (enable)
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val |= codec->resource[id].mask;
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else
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val &= ~codec->resource[id].mask;
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twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
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val, codec->resource[id].reg);
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return val;
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}
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static inline int twl4030_codec_get_resource(enum twl4030_codec_res id)
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{
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struct twl4030_codec *codec = platform_get_drvdata(twl4030_codec_dev);
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u8 val;
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twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, &val,
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codec->resource[id].reg);
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return val;
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}
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/*
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* Enable the resource.
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* The function returns with error or the content of the register
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*/
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int twl4030_codec_enable_resource(enum twl4030_codec_res id)
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{
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struct twl4030_codec *codec = platform_get_drvdata(twl4030_codec_dev);
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int val;
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if (id >= TWL4030_CODEC_RES_MAX) {
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dev_err(&twl4030_codec_dev->dev,
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"Invalid resource ID (%u)\n", id);
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return -EINVAL;
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}
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mutex_lock(&codec->mutex);
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if (!codec->resource[id].request_count)
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/* Resource was disabled, enable it */
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val = twl4030_codec_set_resource(id, 1);
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else
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val = twl4030_codec_get_resource(id);
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codec->resource[id].request_count++;
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mutex_unlock(&codec->mutex);
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return val;
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}
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EXPORT_SYMBOL_GPL(twl4030_codec_enable_resource);
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/*
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* Disable the resource.
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* The function returns with error or the content of the register
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*/
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int twl4030_codec_disable_resource(unsigned id)
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{
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struct twl4030_codec *codec = platform_get_drvdata(twl4030_codec_dev);
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int val;
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if (id >= TWL4030_CODEC_RES_MAX) {
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dev_err(&twl4030_codec_dev->dev,
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"Invalid resource ID (%u)\n", id);
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return -EINVAL;
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}
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mutex_lock(&codec->mutex);
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if (!codec->resource[id].request_count) {
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dev_err(&twl4030_codec_dev->dev,
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"Resource has been disabled already (%u)\n", id);
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mutex_unlock(&codec->mutex);
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return -EPERM;
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}
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codec->resource[id].request_count--;
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if (!codec->resource[id].request_count)
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/* Resource can be disabled now */
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val = twl4030_codec_set_resource(id, 0);
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else
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val = twl4030_codec_get_resource(id);
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mutex_unlock(&codec->mutex);
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return val;
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}
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EXPORT_SYMBOL_GPL(twl4030_codec_disable_resource);
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unsigned int twl4030_codec_get_mclk(void)
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{
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struct twl4030_codec *codec = platform_get_drvdata(twl4030_codec_dev);
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return codec->audio_mclk;
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}
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EXPORT_SYMBOL_GPL(twl4030_codec_get_mclk);
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static int __devinit twl4030_codec_probe(struct platform_device *pdev)
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{
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struct twl4030_codec *codec;
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struct twl4030_codec_data *pdata = pdev->dev.platform_data;
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struct mfd_cell *cell = NULL;
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int ret, childs = 0;
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u8 val;
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if (!pdata) {
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dev_err(&pdev->dev, "Platform data is missing\n");
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return -EINVAL;
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}
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/* Configure APLL_INFREQ and disable APLL if enabled */
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val = 0;
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switch (pdata->audio_mclk) {
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case 19200000:
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val |= TWL4030_APLL_INFREQ_19200KHZ;
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break;
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case 26000000:
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val |= TWL4030_APLL_INFREQ_26000KHZ;
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break;
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case 38400000:
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val |= TWL4030_APLL_INFREQ_38400KHZ;
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break;
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default:
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dev_err(&pdev->dev, "Invalid audio_mclk\n");
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return -EINVAL;
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}
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twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
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val, TWL4030_REG_APLL_CTL);
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codec = kzalloc(sizeof(struct twl4030_codec), GFP_KERNEL);
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if (!codec)
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return -ENOMEM;
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platform_set_drvdata(pdev, codec);
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twl4030_codec_dev = pdev;
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mutex_init(&codec->mutex);
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codec->audio_mclk = pdata->audio_mclk;
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/* Codec power */
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codec->resource[TWL4030_CODEC_RES_POWER].reg = TWL4030_REG_CODEC_MODE;
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codec->resource[TWL4030_CODEC_RES_POWER].mask = TWL4030_CODECPDZ;
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/* PLL */
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codec->resource[TWL4030_CODEC_RES_APLL].reg = TWL4030_REG_APLL_CTL;
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codec->resource[TWL4030_CODEC_RES_APLL].mask = TWL4030_APLL_EN;
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if (pdata->audio) {
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cell = &codec->cells[childs];
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cell->name = "twl4030_codec_audio";
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cell->platform_data = pdata->audio;
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cell->data_size = sizeof(*pdata->audio);
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childs++;
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}
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if (pdata->vibra) {
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cell = &codec->cells[childs];
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cell->name = "twl4030_codec_vibra";
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cell->platform_data = pdata->vibra;
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cell->data_size = sizeof(*pdata->vibra);
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childs++;
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}
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if (childs)
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ret = mfd_add_devices(&pdev->dev, pdev->id, codec->cells,
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childs, NULL, 0);
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else {
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dev_err(&pdev->dev, "No platform data found for childs\n");
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ret = -ENODEV;
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}
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if (!ret)
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return 0;
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platform_set_drvdata(pdev, NULL);
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kfree(codec);
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twl4030_codec_dev = NULL;
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return ret;
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}
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static int __devexit twl4030_codec_remove(struct platform_device *pdev)
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{
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struct twl4030_codec *codec = platform_get_drvdata(pdev);
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mfd_remove_devices(&pdev->dev);
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platform_set_drvdata(pdev, NULL);
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kfree(codec);
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twl4030_codec_dev = NULL;
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return 0;
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}
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MODULE_ALIAS("platform:twl4030_codec");
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static struct platform_driver twl4030_codec_driver = {
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.probe = twl4030_codec_probe,
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.remove = __devexit_p(twl4030_codec_remove),
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.driver = {
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.owner = THIS_MODULE,
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.name = "twl4030_codec",
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},
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};
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static int __devinit twl4030_codec_init(void)
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{
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return platform_driver_register(&twl4030_codec_driver);
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}
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module_init(twl4030_codec_init);
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static void __devexit twl4030_codec_exit(void)
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{
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platform_driver_unregister(&twl4030_codec_driver);
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}
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module_exit(twl4030_codec_exit);
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MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@nokia.com>");
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MODULE_LICENSE("GPL");
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