/* * MFD driver for twl4030 audio submodule, which contains an audio codec, and * the vibra control. * * Author: Peter Ujfalusi <peter.ujfalusi@ti.com> * * Copyright: (C) 2009 Nokia Corporation * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA * 02110-1301 USA * */ #include <linux/module.h> #include <linux/types.h> #include <linux/slab.h> #include <linux/kernel.h> #include <linux/fs.h> #include <linux/platform_device.h> #include <linux/i2c/twl.h> #include <linux/mfd/core.h> #include <linux/mfd/twl4030-audio.h> #define TWL4030_AUDIO_CELLS 2 static struct platform_device *twl4030_audio_dev; struct twl4030_audio_resource { int request_count; u8 reg; u8 mask; }; struct twl4030_audio { unsigned int audio_mclk; struct mutex mutex; struct twl4030_audio_resource resource[TWL4030_AUDIO_RES_MAX]; struct mfd_cell cells[TWL4030_AUDIO_CELLS]; }; /* * Modify the resource, the function returns the content of the register * after the modification. */ static int twl4030_audio_set_resource(enum twl4030_audio_res id, int enable) { struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev); u8 val; twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, &val, audio->resource[id].reg); if (enable) val |= audio->resource[id].mask; else val &= ~audio->resource[id].mask; twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE, val, audio->resource[id].reg); return val; } static inline int twl4030_audio_get_resource(enum twl4030_audio_res id) { struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev); u8 val; twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, &val, audio->resource[id].reg); return val; } /* * Enable the resource. * The function returns with error or the content of the register */ int twl4030_audio_enable_resource(enum twl4030_audio_res id) { struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev); int val; if (id >= TWL4030_AUDIO_RES_MAX) { dev_err(&twl4030_audio_dev->dev, "Invalid resource ID (%u)\n", id); return -EINVAL; } mutex_lock(&audio->mutex); if (!audio->resource[id].request_count) /* Resource was disabled, enable it */ val = twl4030_audio_set_resource(id, 1); else val = twl4030_audio_get_resource(id); audio->resource[id].request_count++; mutex_unlock(&audio->mutex); return val; } EXPORT_SYMBOL_GPL(twl4030_audio_enable_resource); /* * Disable the resource. * The function returns with error or the content of the register */ int twl4030_audio_disable_resource(unsigned id) { struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev); int val; if (id >= TWL4030_AUDIO_RES_MAX) { dev_err(&twl4030_audio_dev->dev, "Invalid resource ID (%u)\n", id); return -EINVAL; } mutex_lock(&audio->mutex); if (!audio->resource[id].request_count) { dev_err(&twl4030_audio_dev->dev, "Resource has been disabled already (%u)\n", id); mutex_unlock(&audio->mutex); return -EPERM; } audio->resource[id].request_count--; if (!audio->resource[id].request_count) /* Resource can be disabled now */ val = twl4030_audio_set_resource(id, 0); else val = twl4030_audio_get_resource(id); mutex_unlock(&audio->mutex); return val; } EXPORT_SYMBOL_GPL(twl4030_audio_disable_resource); unsigned int twl4030_audio_get_mclk(void) { struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev); return audio->audio_mclk; } EXPORT_SYMBOL_GPL(twl4030_audio_get_mclk); static int __devinit twl4030_audio_probe(struct platform_device *pdev) { struct twl4030_audio *audio; struct twl4030_audio_data *pdata = pdev->dev.platform_data; struct mfd_cell *cell = NULL; int ret, childs = 0; u8 val; if (!pdata) { dev_err(&pdev->dev, "Platform data is missing\n"); return -EINVAL; } /* Configure APLL_INFREQ and disable APLL if enabled */ val = 0; switch (pdata->audio_mclk) { case 19200000: val |= TWL4030_APLL_INFREQ_19200KHZ; break; case 26000000: val |= TWL4030_APLL_INFREQ_26000KHZ; break; case 38400000: val |= TWL4030_APLL_INFREQ_38400KHZ; break; default: dev_err(&pdev->dev, "Invalid audio_mclk\n"); return -EINVAL; } twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE, val, TWL4030_REG_APLL_CTL); audio = kzalloc(sizeof(struct twl4030_audio), GFP_KERNEL); if (!audio) return -ENOMEM; platform_set_drvdata(pdev, audio); twl4030_audio_dev = pdev; mutex_init(&audio->mutex); audio->audio_mclk = pdata->audio_mclk; /* Codec power */ audio->resource[TWL4030_AUDIO_RES_POWER].reg = TWL4030_REG_CODEC_MODE; audio->resource[TWL4030_AUDIO_RES_POWER].mask = TWL4030_CODECPDZ; /* PLL */ audio->resource[TWL4030_AUDIO_RES_APLL].reg = TWL4030_REG_APLL_CTL; audio->resource[TWL4030_AUDIO_RES_APLL].mask = TWL4030_APLL_EN; if (pdata->codec) { cell = &audio->cells[childs]; cell->name = "twl4030-codec"; cell->platform_data = pdata->codec; cell->pdata_size = sizeof(*pdata->codec); childs++; } if (pdata->vibra) { cell = &audio->cells[childs]; cell->name = "twl4030-vibra"; cell->platform_data = pdata->vibra; cell->pdata_size = sizeof(*pdata->vibra); childs++; } if (childs) ret = mfd_add_devices(&pdev->dev, pdev->id, audio->cells, childs, NULL, 0); else { dev_err(&pdev->dev, "No platform data found for childs\n"); ret = -ENODEV; } if (!ret) return 0; platform_set_drvdata(pdev, NULL); kfree(audio); twl4030_audio_dev = NULL; return ret; } static int __devexit twl4030_audio_remove(struct platform_device *pdev) { struct twl4030_audio *audio = platform_get_drvdata(pdev); mfd_remove_devices(&pdev->dev); platform_set_drvdata(pdev, NULL); kfree(audio); twl4030_audio_dev = NULL; return 0; } MODULE_ALIAS("platform:twl4030-audio"); static struct platform_driver twl4030_audio_driver = { .probe = twl4030_audio_probe, .remove = __devexit_p(twl4030_audio_remove), .driver = { .owner = THIS_MODULE, .name = "twl4030-audio", }, }; module_platform_driver(twl4030_audio_driver); MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>"); MODULE_LICENSE("GPL");