1 files changed, 277 insertions, 0 deletions

diff --git a/drivers/mfd/twl4030-audio.c b/drivers/mfd/twl4030-audio.c
new file mode 100644
index 000000000000..ae51ab5d0e5d
--- /dev/null
+++ b/drivers/mfd/twl4030-audio.c
@@ -0,0 +1,277 @@
+/*
+ * 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",
+        },
+};
+
+static int __devinit twl4030_audio_init(void)
+{
+        return platform_driver_register(&twl4030_audio_driver);
+}
+module_init(twl4030_audio_init);
+
+static void __devexit twl4030_audio_exit(void)
+{
+        platform_driver_unregister(&twl4030_audio_driver);
+}
+module_exit(twl4030_audio_exit);
+
+MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
+MODULE_LICENSE("GPL");