1 files changed, 463 insertions, 0 deletions

diff --git a/sound/soc/codecs/tpa6130a2.c b/sound/soc/codecs/tpa6130a2.c
new file mode 100644
index 000000000000..1b77c959e2dc
--- /dev/null
+++ b/sound/soc/codecs/tpa6130a2.c
@@ -0,0 +1,463 @@
+/*
+ * ALSA SoC Texas Instruments TPA6130A2 headset stereo amplifier driver
+ *
+ * Copyright (C) Nokia Corporation
+ *
+ * Author: Peter Ujfalusi <peter.ujfalusi@nokia.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 <sound/tpa6130a2-plat.h>
+#include <sound/soc.h>
+#include <sound/soc-dapm.h>
+#include <sound/tlv.h>
+
+#include "tpa6130a2.h"
+
+struct i2c_client *tpa6130a2_client;
+
+/* This struct is used to save the context */
+struct tpa6130a2_data {
+        struct mutex mutex;
+        unsigned char regs[TPA6130A2_CACHEREGNUM];
+        int power_gpio;
+        unsigned char power_state;
+};
+
+static int tpa6130a2_i2c_read(int reg)
+{
+        struct tpa6130a2_data *data;
+        int val;
+
+        BUG_ON(tpa6130a2_client == NULL);
+        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;
+
+        BUG_ON(tpa6130a2_client == NULL);
+        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");
+        }
+
+        /* 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;
+
+        BUG_ON(tpa6130a2_client == NULL);
+        data = i2c_get_clientdata(tpa6130a2_client);
+
+        return data->regs[reg];
+}
+
+static void tpa6130a2_initialize(void)
+{
+        struct tpa6130a2_data *data;
+        int i;
+
+        BUG_ON(tpa6130a2_client == NULL);
+        data = i2c_get_clientdata(tpa6130a2_client);
+
+        for (i = 1; i < TPA6130A2_REG_VERSION; i++)
+                tpa6130a2_i2c_write(i, data->regs[i]);
+}
+
+void tpa6130a2_power(int power)
+{
+        struct  tpa6130a2_data *data;
+        u8      val;
+
+        BUG_ON(tpa6130a2_client == NULL);
+        data = i2c_get_clientdata(tpa6130a2_client);
+
+        mutex_lock(&data->mutex);
+        if (power) {
+                /* Power on */
+                if (data->power_gpio >= 0) {
+                        gpio_set_value(data->power_gpio, 1);
+                        data->power_state = 1;
+                        tpa6130a2_initialize();
+                }
+                /* Clear SWS */
+                val = tpa6130a2_read(TPA6130A2_REG_CONTROL);
+                val &= ~TPA6130A2_SWS;
+                tpa6130a2_i2c_write(TPA6130A2_REG_CONTROL, val);
+        } 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);
+                        data->power_state = 0;
+                }
+        }
+        mutex_unlock(&data->mutex);
+}
+
+static int tpa6130a2_get_reg(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;
+        unsigned int mask = mc->max;
+        unsigned int invert = mc->invert;
+
+        BUG_ON(tpa6130a2_client == NULL);
+        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] =
+                        mask - ucontrol->value.integer.value[0];
+
+        mutex_unlock(&data->mutex);
+        return 0;
+}
+
+static int tpa6130a2_set_reg(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;
+        unsigned int mask = mc->max;
+        unsigned int invert = mc->invert;
+        unsigned int val = (ucontrol->value.integer.value[0] & mask);
+        unsigned int val_reg;
+
+        BUG_ON(tpa6130a2_client == NULL);
+        data = i2c_get_clientdata(tpa6130a2_client);
+
+        if (invert)
+                val = mask - 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_reg, tpa6130a2_set_reg,
+                       tpa6130_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)
+{
+        struct  tpa6130a2_data *data;
+        u8      val;
+
+        BUG_ON(tpa6130a2_client == NULL);
+        data = i2c_get_clientdata(tpa6130a2_client);
+
+        if (enable) {
+                /* Enable channel */
+                /* Enable amplifier */
+                val = tpa6130a2_read(TPA6130A2_REG_CONTROL);
+                val |= channel;
+                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);
+        }
+}
+
+static int tpa6130a2_left_event(struct snd_soc_dapm_widget *w,
+                struct snd_kcontrol *kcontrol, int event)
+{
+        switch (event) {
+        case SND_SOC_DAPM_POST_PMU:
+                tpa6130a2_channel_enable(TPA6130A2_HP_EN_L, 1);
+                break;
+        case SND_SOC_DAPM_POST_PMD:
+                tpa6130a2_channel_enable(TPA6130A2_HP_EN_L, 0);
+                break;
+        }
+        return 0;
+}
+
+static int tpa6130a2_right_event(struct snd_soc_dapm_widget *w,
+                struct snd_kcontrol *kcontrol, int event)
+{
+        switch (event) {
+        case SND_SOC_DAPM_POST_PMU:
+                tpa6130a2_channel_enable(TPA6130A2_HP_EN_R, 1);
+                break;
+        case SND_SOC_DAPM_POST_PMD:
+                tpa6130a2_channel_enable(TPA6130A2_HP_EN_R, 0);
+                break;
+        }
+        return 0;
+}
+
+static int tpa6130a2_supply_event(struct snd_soc_dapm_widget *w,
+                struct snd_kcontrol *kcontrol, int event)
+{
+        switch (event) {
+        case SND_SOC_DAPM_POST_PMU:
+                tpa6130a2_power(1);
+                break;
+        case SND_SOC_DAPM_POST_PMD:
+                tpa6130a2_power(0);
+                break;
+        }
+        return 0;
+}
+
+static const struct snd_soc_dapm_widget tpa6130a2_dapm_widgets[] = {
+        SND_SOC_DAPM_PGA_E("TPA6130A2 Left", SND_SOC_NOPM,
+                        0, 0, NULL, 0, tpa6130a2_left_event,
+                        SND_SOC_DAPM_POST_PMU|SND_SOC_DAPM_POST_PMD),
+        SND_SOC_DAPM_PGA_E("TPA6130A2 Right", SND_SOC_NOPM,
+                        0, 0, NULL, 0, tpa6130a2_right_event,
+                        SND_SOC_DAPM_POST_PMU|SND_SOC_DAPM_POST_PMD),
+        SND_SOC_DAPM_SUPPLY("TPA6130A2 Enable", SND_SOC_NOPM,
+                        0, 0, tpa6130a2_supply_event,
+                        SND_SOC_DAPM_POST_PMU|SND_SOC_DAPM_POST_PMD),
+        /* Outputs */
+        SND_SOC_DAPM_HP("TPA6130A2 Headphone Left", NULL),
+        SND_SOC_DAPM_HP("TPA6130A2 Headphone Right", NULL),
+};
+
+static const struct snd_soc_dapm_route audio_map[] = {
+        {"TPA6130A2 Headphone Left", NULL, "TPA6130A2 Left"},
+        {"TPA6130A2 Headphone Right", NULL, "TPA6130A2 Right"},
+
+        {"TPA6130A2 Headphone Left", NULL, "TPA6130A2 Enable"},
+        {"TPA6130A2 Headphone Right", NULL, "TPA6130A2 Enable"},
+};
+
+int tpa6130a2_add_controls(struct snd_soc_codec *codec)
+{
+        snd_soc_dapm_new_controls(codec, tpa6130a2_dapm_widgets,
+                                ARRAY_SIZE(tpa6130a2_dapm_widgets));
+
+        snd_soc_dapm_add_routes(codec, audio_map, ARRAY_SIZE(audio_map));
+
+        return snd_soc_add_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;
+        int ret;
+
+        dev = &client->dev;
+
+        if (client->dev.platform_data == NULL) {
+                dev_err(dev, "Platform data not set\n");
+                dump_stack();
+                return -ENODEV;
+        }
+
+        data = kzalloc(sizeof(*data), GFP_KERNEL);
+        if (data == NULL) {
+                dev_err(dev, "Can not allocate memory\n");
+                return -ENOMEM;
+        }
+
+        tpa6130a2_client = client;
+
+        i2c_set_clientdata(tpa6130a2_client, data);
+
+        pdata = (struct tpa6130a2_platform_data *)client->dev.platform_data;
+        data->power_gpio = pdata->power_gpio;
+
+        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 = gpio_request(data->power_gpio, "tpa6130a2 enable");
+                if (ret < 0) {
+                        dev_err(dev, "Failed to request power GPIO (%d)\n",
+                                data->power_gpio);
+                        goto fail;
+                }
+                gpio_direction_output(data->power_gpio, 0);
+        } else {
+                data->power_state = 1;
+                tpa6130a2_initialize();
+        }
+
+        tpa6130a2_power(1);
+
+        /* 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 */
+        tpa6130a2_power(0);
+
+        return 0;
+fail:
+        kfree(data);
+        i2c_set_clientdata(tpa6130a2_client, NULL);
+        tpa6130a2_client = 0;
+
+        return ret;
+}
+
+static int tpa6130a2_remove(struct i2c_client *client)
+{
+        struct tpa6130a2_data *data = i2c_get_clientdata(client);
+
+        tpa6130a2_power(0);
+
+        if (data->power_gpio >= 0)
+                gpio_free(data->power_gpio);
+        kfree(data);
+        tpa6130a2_client = 0;
+
+        return 0;
+}
+
+static const struct i2c_device_id tpa6130a2_id[] = {
+        { "tpa6130a2", 0 },
+        { }
+};
+MODULE_DEVICE_TABLE(i2c, tpa6130a2_id);
+
+static struct i2c_driver tpa6130a2_i2c_driver = {
+        .driver = {
+                .name = "tpa6130a2",
+                .owner = THIS_MODULE,
+        },
+        .probe = tpa6130a2_probe,
+        .remove = __devexit_p(tpa6130a2_remove),
+        .id_table = tpa6130a2_id,
+};
+
+static int __init tpa6130a2_init(void)
+{
+        return i2c_add_driver(&tpa6130a2_i2c_driver);
+}
+
+static void __exit tpa6130a2_exit(void)
+{
+        i2c_del_driver(&tpa6130a2_i2c_driver);
+}
+
+MODULE_AUTHOR("Peter Ujfalusi");
+MODULE_DESCRIPTION("TPA6130A2 Headphone amplifier driver");
+MODULE_LICENSE("GPL");
+
+module_init(tpa6130a2_init);
+module_exit(tpa6130a2_exit);