--- /dev/null
+/*
+ * 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/of.h>
+#include <linux/of_platform.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(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) {
+ 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 bool twl4030_audio_has_codec(struct twl4030_audio_data *pdata,
+ struct device_node *node)
+{
+ if (pdata && pdata->codec)
+ return true;
+
+ if (of_find_node_by_name(node, "codec"))
+ return true;
+
+ return false;
+}
+
+static bool twl4030_audio_has_vibra(struct twl4030_audio_data *pdata,
+ struct device_node *node)
+{
+ int vibra;
+
+ if (pdata && pdata->vibra)
+ return true;
+
+ if (!of_property_read_u32(node, "ti,enable-vibra", &vibra) && vibra)
+ return true;
+
+ return false;
+}
+
+static int twl4030_audio_probe(struct platform_device *pdev)
+{
+ struct twl4030_audio *audio;
+ struct twl4030_audio_data *pdata = dev_get_platdata(&pdev->dev);
+ struct device_node *node = pdev->dev.of_node;
+ struct mfd_cell *cell = NULL;
+ int ret, childs = 0;
+ u8 val;
+
+ if (!pdata && !node) {
+ dev_err(&pdev->dev, "Platform data is missing\n");
+ return -EINVAL;
+ }
+
+ audio = devm_kzalloc(&pdev->dev, sizeof(struct twl4030_audio),
+ GFP_KERNEL);
+ if (!audio)
+ return -ENOMEM;
+
+ mutex_init(&audio->mutex);
+ audio->audio_mclk = twl_get_hfclk_rate();
+
+ /* Configure APLL_INFREQ and disable APLL if enabled */
+ switch (audio->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);
+
+ /* 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 (twl4030_audio_has_codec(pdata, node)) {
+ cell = &audio->cells[childs];
+ cell->name = "twl4030-codec";
+ if (pdata) {
+ cell->platform_data = pdata->codec;
+ cell->pdata_size = sizeof(*pdata->codec);
+ }
+ childs++;
+ }
+ if (twl4030_audio_has_vibra(pdata, node)) {
+ cell = &audio->cells[childs];
+ cell->name = "twl4030-vibra";
+ if (pdata) {
+ cell->platform_data = pdata->vibra;
+ cell->pdata_size = sizeof(*pdata->vibra);
+ }
+ childs++;
+ }
+
+ platform_set_drvdata(pdev, audio);
+ twl4030_audio_dev = pdev;
+
+ if (childs)
+ ret = mfd_add_devices(&pdev->dev, pdev->id, audio->cells,
+ childs, NULL, 0, NULL);
+ else {
+ dev_err(&pdev->dev, "No platform data found for childs\n");
+ ret = -ENODEV;
+ }
+
+ if (ret)
+ twl4030_audio_dev = NULL;
+
+ return ret;
+}
+
+static int twl4030_audio_remove(struct platform_device *pdev)
+{
+ mfd_remove_devices(&pdev->dev);
+ twl4030_audio_dev = NULL;
+
+ return 0;
+}
+
+static const struct of_device_id twl4030_audio_of_match[] = {
+ {.compatible = "ti,twl4030-audio", },
+ { },
+};
+MODULE_DEVICE_TABLE(of, twl4030_audio_of_match);
+
+static struct platform_driver twl4030_audio_driver = {
+ .driver = {
+ .name = "twl4030-audio",
+ .of_match_table = twl4030_audio_of_match,
+ },
+ .probe = twl4030_audio_probe,
+ .remove = twl4030_audio_remove,
+};
+
+module_platform_driver(twl4030_audio_driver);
+
+MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
+MODULE_DESCRIPTION("TWL4030 audio block MFD driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:twl4030-audio");
Code Review / kvmfornfv.git / blobdiff