Add the rt linux 4.1.3-rt3 as base

Import the rt linux 4.1.3-rt3 as OPNFV kvm base.

It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:

commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date:   Sat Jul 25 12:13:34 2015 +0200

    Prepare v4.1.3-rt3

    Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.

Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>

1 files changed, 503 insertions, 0 deletions

diff --git a/kernel/sound/soc/codecs/tpa6130a2.c b/kernel/sound/soc/codecs/tpa6130a2.c
new file mode 100644
index 000000000..6fac9e034
--- /dev/null
+++ b/kernel/sound/soc/codecs/tpa6130a2.c
@@ -0,0 +1,503 @@
+/*
+ * ALSA SoC Texas Instruments TPA6130A2 headset stereo amplifier driver
+ *
+ * Copyright (C) Nokia Corporation
+ *
+ * Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
+ *
+ * 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/errno.h>
+#include <linux/device.h>
+#include <linux/i2c.h>
+#include <linux/gpio.h>
+#include <linux/regulator/consumer.h>
+#include <linux/slab.h>
+#include <sound/tpa6130a2-plat.h>
+#include <sound/soc.h>
+#include <sound/tlv.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+
+#include "tpa6130a2.h"
+
+enum tpa_model {
+	TPA6130A2,
+	TPA6140A2,
+};
+
+static struct i2c_client *tpa6130a2_client;
+
+/* This struct is used to save the context */
+struct tpa6130a2_data {
+	struct mutex mutex;
+	unsigned char regs[TPA6130A2_CACHEREGNUM];
+	struct regulator *supply;
+	int power_gpio;
+	u8 power_state:1;
+	enum tpa_model id;
+};
+
+static int tpa6130a2_i2c_read(int reg)
+{
+	struct tpa6130a2_data *data;
+	int val;
+
+	if (WARN_ON(!tpa6130a2_client))
+		return -EINVAL;
+	data = i2c_get_clientdata(tpa6130a2_client);
+
+	/* If powered off, return the cached value */
+	if (data->power_state) {
+		val = i2c_smbus_read_byte_data(tpa6130a2_client, reg);
+		if (val < 0)
+			dev_err(&tpa6130a2_client->dev, "Read failed\n");
+		else
+			data->regs[reg] = val;
+	} else {
+		val = data->regs[reg];
+	}
+
+	return val;
+}
+
+static int tpa6130a2_i2c_write(int reg, u8 value)
+{
+	struct tpa6130a2_data *data;
+	int val = 0;
+
+	if (WARN_ON(!tpa6130a2_client))
+		return -EINVAL;
+	data = i2c_get_clientdata(tpa6130a2_client);
+
+	if (data->power_state) {
+		val = i2c_smbus_write_byte_data(tpa6130a2_client, reg, value);
+		if (val < 0) {
+			dev_err(&tpa6130a2_client->dev, "Write failed\n");
+			return val;
+		}
+	}
+
+	/* Either powered on or off, we save the context */
+	data->regs[reg] = value;
+
+	return val;
+}
+
+static u8 tpa6130a2_read(int reg)
+{
+	struct tpa6130a2_data *data;
+
+	if (WARN_ON(!tpa6130a2_client))
+		return 0;
+	data = i2c_get_clientdata(tpa6130a2_client);
+
+	return data->regs[reg];
+}
+
+static int tpa6130a2_initialize(void)
+{
+	struct tpa6130a2_data *data;
+	int i, ret = 0;
+
+	if (WARN_ON(!tpa6130a2_client))
+		return -EINVAL;
+	data = i2c_get_clientdata(tpa6130a2_client);
+
+	for (i = 1; i < TPA6130A2_REG_VERSION; i++) {
+		ret = tpa6130a2_i2c_write(i, data->regs[i]);
+		if (ret < 0)
+			break;
+	}
+
+	return ret;
+}
+
+static int tpa6130a2_power(u8 power)
+{
+	struct	tpa6130a2_data *data;
+	u8	val;
+	int	ret = 0;
+
+	if (WARN_ON(!tpa6130a2_client))
+		return -EINVAL;
+	data = i2c_get_clientdata(tpa6130a2_client);
+
+	mutex_lock(&data->mutex);
+	if (power == data->power_state)
+		goto exit;
+
+	if (power) {
+		ret = regulator_enable(data->supply);
+		if (ret != 0) {
+			dev_err(&tpa6130a2_client->dev,
+				"Failed to enable supply: %d\n", ret);
+			goto exit;
+		}
+		/* Power on */
+		if (data->power_gpio >= 0)
+			gpio_set_value(data->power_gpio, 1);
+
+		data->power_state = 1;
+		ret = tpa6130a2_initialize();
+		if (ret < 0) {
+			dev_err(&tpa6130a2_client->dev,
+				"Failed to initialize chip\n");
+			if (data->power_gpio >= 0)
+				gpio_set_value(data->power_gpio, 0);
+			regulator_disable(data->supply);
+			data->power_state = 0;
+			goto exit;
+		}
+	} else {
+		/* set SWS */
+		val = tpa6130a2_read(TPA6130A2_REG_CONTROL);
+		val |= TPA6130A2_SWS;
+		tpa6130a2_i2c_write(TPA6130A2_REG_CONTROL, val);
+
+		/* Power off */
+		if (data->power_gpio >= 0)
+			gpio_set_value(data->power_gpio, 0);
+
+		ret = regulator_disable(data->supply);
+		if (ret != 0) {
+			dev_err(&tpa6130a2_client->dev,
+				"Failed to disable supply: %d\n", ret);
+			goto exit;
+		}
+
+		data->power_state = 0;
+	}
+
+exit:
+	mutex_unlock(&data->mutex);
+	return ret;
+}
+
+static int tpa6130a2_get_volsw(struct snd_kcontrol *kcontrol,
+		struct snd_ctl_elem_value *ucontrol)
+{
+	struct soc_mixer_control *mc =
+		(struct soc_mixer_control *)kcontrol->private_value;
+	struct tpa6130a2_data *data;
+	unsigned int reg = mc->reg;
+	unsigned int shift = mc->shift;
+	int max = mc->max;
+	unsigned int mask = (1 << fls(max)) - 1;
+	unsigned int invert = mc->invert;
+
+	if (WARN_ON(!tpa6130a2_client))
+		return -EINVAL;
+	data = i2c_get_clientdata(tpa6130a2_client);
+
+	mutex_lock(&data->mutex);
+
+	ucontrol->value.integer.value[0] =
+		(tpa6130a2_read(reg) >> shift) & mask;
+
+	if (invert)
+		ucontrol->value.integer.value[0] =
+			max - ucontrol->value.integer.value[0];
+
+	mutex_unlock(&data->mutex);
+	return 0;
+}
+
+static int tpa6130a2_put_volsw(struct snd_kcontrol *kcontrol,
+		struct snd_ctl_elem_value *ucontrol)
+{
+	struct soc_mixer_control *mc =
+		(struct soc_mixer_control *)kcontrol->private_value;
+	struct tpa6130a2_data *data;
+	unsigned int reg = mc->reg;
+	unsigned int shift = mc->shift;
+	int max = mc->max;
+	unsigned int mask = (1 << fls(max)) - 1;
+	unsigned int invert = mc->invert;
+	unsigned int val = (ucontrol->value.integer.value[0] & mask);
+	unsigned int val_reg;
+
+	if (WARN_ON(!tpa6130a2_client))
+		return -EINVAL;
+	data = i2c_get_clientdata(tpa6130a2_client);
+
+	if (invert)
+		val = max - val;
+
+	mutex_lock(&data->mutex);
+
+	val_reg = tpa6130a2_read(reg);
+	if (((val_reg >> shift) & mask) == val) {
+		mutex_unlock(&data->mutex);
+		return 0;
+	}
+
+	val_reg &= ~(mask << shift);
+	val_reg |= val << shift;
+	tpa6130a2_i2c_write(reg, val_reg);
+
+	mutex_unlock(&data->mutex);
+
+	return 1;
+}
+
+/*
+ * TPA6130 volume. From -59.5 to 4 dB with increasing step size when going
+ * down in gain.
+ */
+static const unsigned int tpa6130_tlv[] = {
+	TLV_DB_RANGE_HEAD(10),
+	0, 1, TLV_DB_SCALE_ITEM(-5950, 600, 0),
+	2, 3, TLV_DB_SCALE_ITEM(-5000, 250, 0),
+	4, 5, TLV_DB_SCALE_ITEM(-4550, 160, 0),
+	6, 7, TLV_DB_SCALE_ITEM(-4140, 190, 0),
+	8, 9, TLV_DB_SCALE_ITEM(-3650, 120, 0),
+	10, 11, TLV_DB_SCALE_ITEM(-3330, 160, 0),
+	12, 13, TLV_DB_SCALE_ITEM(-3040, 180, 0),
+	14, 20, TLV_DB_SCALE_ITEM(-2710, 110, 0),
+	21, 37, TLV_DB_SCALE_ITEM(-1960, 74, 0),
+	38, 63, TLV_DB_SCALE_ITEM(-720, 45, 0),
+};
+
+static const struct snd_kcontrol_new tpa6130a2_controls[] = {
+	SOC_SINGLE_EXT_TLV("TPA6130A2 Headphone Playback Volume",
+		       TPA6130A2_REG_VOL_MUTE, 0, 0x3f, 0,
+		       tpa6130a2_get_volsw, tpa6130a2_put_volsw,
+		       tpa6130_tlv),
+};
+
+static const unsigned int tpa6140_tlv[] = {
+	TLV_DB_RANGE_HEAD(3),
+	0, 8, TLV_DB_SCALE_ITEM(-5900, 400, 0),
+	9, 16, TLV_DB_SCALE_ITEM(-2500, 200, 0),
+	17, 31, TLV_DB_SCALE_ITEM(-1000, 100, 0),
+};
+
+static const struct snd_kcontrol_new tpa6140a2_controls[] = {
+	SOC_SINGLE_EXT_TLV("TPA6140A2 Headphone Playback Volume",
+		       TPA6130A2_REG_VOL_MUTE, 1, 0x1f, 0,
+		       tpa6130a2_get_volsw, tpa6130a2_put_volsw,
+		       tpa6140_tlv),
+};
+
+/*
+ * Enable or disable channel (left or right)
+ * The bit number for mute and amplifier are the same per channel:
+ * bit 6: Right channel
+ * bit 7: Left channel
+ * in both registers.
+ */
+static void tpa6130a2_channel_enable(u8 channel, int enable)
+{
+	u8	val;
+
+	if (enable) {
+		/* Enable channel */
+		/* Enable amplifier */
+		val = tpa6130a2_read(TPA6130A2_REG_CONTROL);
+		val |= channel;
+		val &= ~TPA6130A2_SWS;
+		tpa6130a2_i2c_write(TPA6130A2_REG_CONTROL, val);
+
+		/* Unmute channel */
+		val = tpa6130a2_read(TPA6130A2_REG_VOL_MUTE);
+		val &= ~channel;
+		tpa6130a2_i2c_write(TPA6130A2_REG_VOL_MUTE, val);
+	} else {
+		/* Disable channel */
+		/* Mute channel */
+		val = tpa6130a2_read(TPA6130A2_REG_VOL_MUTE);
+		val |= channel;
+		tpa6130a2_i2c_write(TPA6130A2_REG_VOL_MUTE, val);
+
+		/* Disable amplifier */
+		val = tpa6130a2_read(TPA6130A2_REG_CONTROL);
+		val &= ~channel;
+		tpa6130a2_i2c_write(TPA6130A2_REG_CONTROL, val);
+	}
+}
+
+int tpa6130a2_stereo_enable(struct snd_soc_codec *codec, int enable)
+{
+	int ret = 0;
+	if (enable) {
+		ret = tpa6130a2_power(1);
+		if (ret < 0)
+			return ret;
+		tpa6130a2_channel_enable(TPA6130A2_HP_EN_R | TPA6130A2_HP_EN_L,
+					 1);
+	} else {
+		tpa6130a2_channel_enable(TPA6130A2_HP_EN_R | TPA6130A2_HP_EN_L,
+					 0);
+		ret = tpa6130a2_power(0);
+	}
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(tpa6130a2_stereo_enable);
+
+int tpa6130a2_add_controls(struct snd_soc_codec *codec)
+{
+	struct	tpa6130a2_data *data;
+
+	if (tpa6130a2_client == NULL)
+		return -ENODEV;
+
+	data = i2c_get_clientdata(tpa6130a2_client);
+
+	if (data->id == TPA6140A2)
+		return snd_soc_add_codec_controls(codec, tpa6140a2_controls,
+						ARRAY_SIZE(tpa6140a2_controls));
+	else
+		return snd_soc_add_codec_controls(codec, tpa6130a2_controls,
+						ARRAY_SIZE(tpa6130a2_controls));
+}
+EXPORT_SYMBOL_GPL(tpa6130a2_add_controls);
+
+static int tpa6130a2_probe(struct i2c_client *client,
+			   const struct i2c_device_id *id)
+{
+	struct device *dev;
+	struct tpa6130a2_data *data;
+	struct tpa6130a2_platform_data *pdata = client->dev.platform_data;
+	struct device_node *np = client->dev.of_node;
+	const char *regulator;
+	int ret;
+
+	dev = &client->dev;
+
+	data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	if (pdata) {
+		data->power_gpio = pdata->power_gpio;
+	} else if (np) {
+		data->power_gpio = of_get_named_gpio(np, "power-gpio", 0);
+	} else {
+		dev_err(dev, "Platform data not set\n");
+		dump_stack();
+		return -ENODEV;
+	}
+
+	tpa6130a2_client = client;
+
+	i2c_set_clientdata(tpa6130a2_client, data);
+
+	data->id = id->driver_data;
+
+	mutex_init(&data->mutex);
+
+	/* Set default register values */
+	data->regs[TPA6130A2_REG_CONTROL] =	TPA6130A2_SWS;
+	data->regs[TPA6130A2_REG_VOL_MUTE] =	TPA6130A2_MUTE_R |
+						TPA6130A2_MUTE_L;
+
+	if (data->power_gpio >= 0) {
+		ret = devm_gpio_request(dev, data->power_gpio,
+					"tpa6130a2 enable");
+		if (ret < 0) {
+			dev_err(dev, "Failed to request power GPIO (%d)\n",
+				data->power_gpio);
+			goto err_gpio;
+		}
+		gpio_direction_output(data->power_gpio, 0);
+	}
+
+	switch (data->id) {
+	default:
+		dev_warn(dev, "Unknown TPA model (%d). Assuming 6130A2\n",
+			 data->id);
+	case TPA6130A2:
+		regulator = "Vdd";
+		break;
+	case TPA6140A2:
+		regulator = "AVdd";
+		break;
+	}
+
+	data->supply = devm_regulator_get(dev, regulator);
+	if (IS_ERR(data->supply)) {
+		ret = PTR_ERR(data->supply);
+		dev_err(dev, "Failed to request supply: %d\n", ret);
+		goto err_gpio;
+	}
+
+	ret = tpa6130a2_power(1);
+	if (ret != 0)
+		goto err_gpio;
+
+
+	/* Read version */
+	ret = tpa6130a2_i2c_read(TPA6130A2_REG_VERSION) &
+				 TPA6130A2_VERSION_MASK;
+	if ((ret != 1) && (ret != 2))
+		dev_warn(dev, "UNTESTED version detected (%d)\n", ret);
+
+	/* Disable the chip */
+	ret = tpa6130a2_power(0);
+	if (ret != 0)
+		goto err_gpio;
+
+	return 0;
+
+err_gpio:
+	tpa6130a2_client = NULL;
+
+	return ret;
+}
+
+static int tpa6130a2_remove(struct i2c_client *client)
+{
+	tpa6130a2_power(0);
+	tpa6130a2_client = NULL;
+
+	return 0;
+}
+
+static const struct i2c_device_id tpa6130a2_id[] = {
+	{ "tpa6130a2", TPA6130A2 },
+	{ "tpa6140a2", TPA6140A2 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, tpa6130a2_id);
+
+#if IS_ENABLED(CONFIG_OF)
+static const struct of_device_id tpa6130a2_of_match[] = {
+	{ .compatible = "ti,tpa6130a2", },
+	{ .compatible = "ti,tpa6140a2" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, tpa6130a2_of_match);
+#endif
+
+static struct i2c_driver tpa6130a2_i2c_driver = {
+	.driver = {
+		.name = "tpa6130a2",
+		.owner = THIS_MODULE,
+		.of_match_table = of_match_ptr(tpa6130a2_of_match),
+	},
+	.probe = tpa6130a2_probe,
+	.remove = tpa6130a2_remove,
+	.id_table = tpa6130a2_id,
+};
+
+module_i2c_driver(tpa6130a2_i2c_driver);
+
+MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
+MODULE_DESCRIPTION("TPA6130A2 Headphone amplifier driver");
+MODULE_LICENSE("GPL");