1 files changed, 241 insertions, 0 deletions

diff --git a/drivers/mfd/twl4030-codec.c b/drivers/mfd/twl4030-codec.c
new file mode 100644
index 000000000000..97103078dc2a
--- /dev/null
+++ b/drivers/mfd/twl4030-codec.c
@@ -0,0 +1,241 @@
+/*
+ * MFD driver for twl4030 codec submodule
+ *
+ * Author:      Peter Ujfalusi <peter.ujfalusi@nokia.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/kernel.h>
+#include <linux/fs.h>
+#include <linux/platform_device.h>
+#include <linux/i2c/twl4030.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/twl4030-codec.h>
+
+#define TWL4030_CODEC_CELLS     2
+
+static struct platform_device *twl4030_codec_dev;
+
+struct twl4030_codec_resource {
+        int request_count;
+        u8 reg;
+        u8 mask;
+};
+
+struct twl4030_codec {
+        struct mutex mutex;
+        struct twl4030_codec_resource resource[TWL4030_CODEC_RES_MAX];
+        struct mfd_cell cells[TWL4030_CODEC_CELLS];
+};
+
+/*
+ * Modify the resource, the function returns the content of the register
+ * after the modification.
+ */
+static int twl4030_codec_set_resource(enum twl4030_codec_res id, int enable)
+{
+        struct twl4030_codec *codec = platform_get_drvdata(twl4030_codec_dev);
+        u8 val;
+
+        twl4030_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, &val,
+                        codec->resource[id].reg);
+
+        if (enable)
+                val |= codec->resource[id].mask;
+        else
+                val &= ~codec->resource[id].mask;
+
+        twl4030_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
+                                        val, codec->resource[id].reg);
+
+        return val;
+}
+
+static inline int twl4030_codec_get_resource(enum twl4030_codec_res id)
+{
+        struct twl4030_codec *codec = platform_get_drvdata(twl4030_codec_dev);
+        u8 val;
+
+        twl4030_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, &val,
+                        codec->resource[id].reg);
+
+        return val;
+}
+
+/*
+ * Enable the resource.
+ * The function returns with error or the content of the register
+ */
+int twl4030_codec_enable_resource(enum twl4030_codec_res id)
+{
+        struct twl4030_codec *codec = platform_get_drvdata(twl4030_codec_dev);
+        int val;
+
+        if (id >= TWL4030_CODEC_RES_MAX) {
+                dev_err(&twl4030_codec_dev->dev,
+                                "Invalid resource ID (%u)\n", id);
+                return -EINVAL;
+        }
+
+        mutex_lock(&codec->mutex);
+        if (!codec->resource[id].request_count)
+                /* Resource was disabled, enable it */
+                val = twl4030_codec_set_resource(id, 1);
+        else
+                val = twl4030_codec_get_resource(id);
+
+        codec->resource[id].request_count++;
+        mutex_unlock(&codec->mutex);
+
+        return val;
+}
+EXPORT_SYMBOL_GPL(twl4030_codec_enable_resource);
+
+/*
+ * Disable the resource.
+ * The function returns with error or the content of the register
+ */
+int twl4030_codec_disable_resource(unsigned id)
+{
+        struct twl4030_codec *codec = platform_get_drvdata(twl4030_codec_dev);
+        int val;
+
+        if (id >= TWL4030_CODEC_RES_MAX) {
+                dev_err(&twl4030_codec_dev->dev,
+                                "Invalid resource ID (%u)\n", id);
+                return -EINVAL;
+        }
+
+        mutex_lock(&codec->mutex);
+        if (!codec->resource[id].request_count) {
+                dev_err(&twl4030_codec_dev->dev,
+                        "Resource has been disabled already (%u)\n", id);
+                mutex_unlock(&codec->mutex);
+                return -EPERM;
+        }
+        codec->resource[id].request_count--;
+
+        if (!codec->resource[id].request_count)
+                /* Resource can be disabled now */
+                val = twl4030_codec_set_resource(id, 0);
+        else
+                val = twl4030_codec_get_resource(id);
+
+        mutex_unlock(&codec->mutex);
+
+        return val;
+}
+EXPORT_SYMBOL_GPL(twl4030_codec_disable_resource);
+
+static int __devinit twl4030_codec_probe(struct platform_device *pdev)
+{
+        struct twl4030_codec *codec;
+        struct twl4030_codec_data *pdata = pdev->dev.platform_data;
+        struct mfd_cell *cell = NULL;
+        int ret, childs = 0;
+
+        codec = kzalloc(sizeof(struct twl4030_codec), GFP_KERNEL);
+        if (!codec)
+                return -ENOMEM;
+
+        platform_set_drvdata(pdev, codec);
+
+        twl4030_codec_dev = pdev;
+        mutex_init(&codec->mutex);
+
+        /* Codec power */
+        codec->resource[TWL4030_CODEC_RES_POWER].reg = TWL4030_REG_CODEC_MODE;
+        codec->resource[TWL4030_CODEC_RES_POWER].mask = TWL4030_CODECPDZ;
+
+        /* PLL */
+        codec->resource[TWL4030_CODEC_RES_APLL].reg = TWL4030_REG_APLL_CTL;
+        codec->resource[TWL4030_CODEC_RES_APLL].mask = TWL4030_APLL_EN;
+
+        if (pdata->audio) {
+                cell = &codec->cells[childs];
+                cell->name = "twl4030_codec_audio";
+                cell->platform_data = pdata->audio;
+                cell->data_size = sizeof(*pdata->audio);
+                childs++;
+        }
+        if (pdata->vibra) {
+                cell = &codec->cells[childs];
+                cell->name = "twl4030_codec_vibra";
+                cell->platform_data = pdata->vibra;
+                cell->data_size = sizeof(*pdata->vibra);
+                childs++;
+        }
+
+        if (childs)
+                ret = mfd_add_devices(&pdev->dev, pdev->id, codec->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(codec);
+        twl4030_codec_dev = NULL;
+        return ret;
+}
+
+static int __devexit twl4030_codec_remove(struct platform_device *pdev)
+{
+        struct twl4030_codec *codec = platform_get_drvdata(pdev);
+
+        mfd_remove_devices(&pdev->dev);
+        platform_set_drvdata(pdev, NULL);
+        kfree(codec);
+        twl4030_codec_dev = NULL;
+
+        return 0;
+}
+
+MODULE_ALIAS("platform:twl4030_codec");
+
+static struct platform_driver twl4030_codec_driver = {
+        .probe          = twl4030_codec_probe,
+        .remove         = __devexit_p(twl4030_codec_remove),
+        .driver         = {
+                .owner  = THIS_MODULE,
+                .name   = "twl4030_codec",
+        },
+};
+
+static int __devinit twl4030_codec_init(void)
+{
+        return platform_driver_register(&twl4030_codec_driver);
+}
+module_init(twl4030_codec_init);
+
+static void __devexit twl4030_codec_exit(void)
+{
+        platform_driver_unregister(&twl4030_codec_driver);
+}
+module_exit(twl4030_codec_exit);
+
+MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@nokia.com>");
+MODULE_LICENSE("GPL");
+