300 lines
7.2 KiB
C
Executable File
300 lines
7.2 KiB
C
Executable File
/*
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* MFD driver for twl4030 audio submodule, which contains an audio codec, and
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* the vibra control.
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*
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* Author: Peter Ujfalusi <peter.ujfalusi@ti.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/of.h>
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#include <linux/of_platform.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-audio.h>
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#define TWL4030_AUDIO_CELLS 2
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static struct platform_device *twl4030_audio_dev;
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struct twl4030_audio_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_audio {
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unsigned int audio_mclk;
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struct mutex mutex;
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struct twl4030_audio_resource resource[TWL4030_AUDIO_RES_MAX];
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struct mfd_cell cells[TWL4030_AUDIO_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_audio_set_resource(enum twl4030_audio_res id, int enable)
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{
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struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev);
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u8 val;
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twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, &val,
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audio->resource[id].reg);
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if (enable)
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val |= audio->resource[id].mask;
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else
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val &= ~audio->resource[id].mask;
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twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
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val, audio->resource[id].reg);
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return val;
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}
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static inline int twl4030_audio_get_resource(enum twl4030_audio_res id)
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{
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struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev);
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u8 val;
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twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, &val,
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audio->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_audio_enable_resource(enum twl4030_audio_res id)
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{
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struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev);
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int val;
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if (id >= TWL4030_AUDIO_RES_MAX) {
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dev_err(&twl4030_audio_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(&audio->mutex);
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if (!audio->resource[id].request_count)
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/* Resource was disabled, enable it */
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val = twl4030_audio_set_resource(id, 1);
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else
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val = twl4030_audio_get_resource(id);
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audio->resource[id].request_count++;
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mutex_unlock(&audio->mutex);
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return val;
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}
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EXPORT_SYMBOL_GPL(twl4030_audio_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_audio_disable_resource(enum twl4030_audio_res id)
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{
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struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev);
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int val;
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if (id >= TWL4030_AUDIO_RES_MAX) {
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dev_err(&twl4030_audio_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(&audio->mutex);
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if (!audio->resource[id].request_count) {
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dev_err(&twl4030_audio_dev->dev,
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"Resource has been disabled already (%u)\n", id);
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mutex_unlock(&audio->mutex);
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return -EPERM;
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}
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audio->resource[id].request_count--;
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if (!audio->resource[id].request_count)
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/* Resource can be disabled now */
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val = twl4030_audio_set_resource(id, 0);
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else
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val = twl4030_audio_get_resource(id);
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mutex_unlock(&audio->mutex);
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return val;
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}
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EXPORT_SYMBOL_GPL(twl4030_audio_disable_resource);
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unsigned int twl4030_audio_get_mclk(void)
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{
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struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev);
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return audio->audio_mclk;
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}
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EXPORT_SYMBOL_GPL(twl4030_audio_get_mclk);
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static bool twl4030_audio_has_codec(struct twl4030_audio_data *pdata,
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struct device_node *node)
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{
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if (pdata && pdata->codec)
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return true;
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if (of_find_node_by_name(node, "codec"))
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return true;
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return false;
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}
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static bool twl4030_audio_has_vibra(struct twl4030_audio_data *pdata,
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struct device_node *node)
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{
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int vibra;
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if (pdata && pdata->vibra)
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return true;
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if (!of_property_read_u32(node, "ti,enable-vibra", &vibra) && vibra)
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return true;
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return false;
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}
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static int twl4030_audio_probe(struct platform_device *pdev)
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{
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struct twl4030_audio *audio;
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struct twl4030_audio_data *pdata = dev_get_platdata(&pdev->dev);
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struct device_node *node = pdev->dev.of_node;
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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 && !node) {
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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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audio = devm_kzalloc(&pdev->dev, sizeof(struct twl4030_audio),
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GFP_KERNEL);
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if (!audio)
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return -ENOMEM;
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mutex_init(&audio->mutex);
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audio->audio_mclk = twl_get_hfclk_rate();
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/* Configure APLL_INFREQ and disable APLL if enabled */
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switch (audio->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, val, TWL4030_REG_APLL_CTL);
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/* Codec power */
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audio->resource[TWL4030_AUDIO_RES_POWER].reg = TWL4030_REG_CODEC_MODE;
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audio->resource[TWL4030_AUDIO_RES_POWER].mask = TWL4030_CODECPDZ;
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/* PLL */
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audio->resource[TWL4030_AUDIO_RES_APLL].reg = TWL4030_REG_APLL_CTL;
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audio->resource[TWL4030_AUDIO_RES_APLL].mask = TWL4030_APLL_EN;
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if (twl4030_audio_has_codec(pdata, node)) {
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cell = &audio->cells[childs];
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cell->name = "twl4030-codec";
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if (pdata) {
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cell->platform_data = pdata->codec;
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cell->pdata_size = sizeof(*pdata->codec);
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}
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childs++;
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}
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if (twl4030_audio_has_vibra(pdata, node)) {
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cell = &audio->cells[childs];
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cell->name = "twl4030-vibra";
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if (pdata) {
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cell->platform_data = pdata->vibra;
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cell->pdata_size = sizeof(*pdata->vibra);
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}
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childs++;
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}
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platform_set_drvdata(pdev, audio);
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twl4030_audio_dev = pdev;
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if (childs)
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ret = mfd_add_devices(&pdev->dev, pdev->id, audio->cells,
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childs, NULL, 0, NULL);
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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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twl4030_audio_dev = NULL;
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return ret;
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}
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static int twl4030_audio_remove(struct platform_device *pdev)
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{
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mfd_remove_devices(&pdev->dev);
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twl4030_audio_dev = NULL;
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return 0;
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}
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static const struct of_device_id twl4030_audio_of_match[] = {
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{.compatible = "ti,twl4030-audio", },
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{ },
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};
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MODULE_DEVICE_TABLE(of, twl4030_audio_of_match);
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static struct platform_driver twl4030_audio_driver = {
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.driver = {
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.owner = THIS_MODULE,
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.name = "twl4030-audio",
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.of_match_table = twl4030_audio_of_match,
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},
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.probe = twl4030_audio_probe,
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.remove = twl4030_audio_remove,
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};
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module_platform_driver(twl4030_audio_driver);
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MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
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MODULE_DESCRIPTION("TWL4030 audio block MFD driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:twl4030-audio");
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