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Date:   Tue, 5 May 2020 10:36:29 +0000
From:   Leslie Hsia(夏邦進_Pegatron) 
        <Leslie_Hsia@...atroncorp.com>
To:     Mark Brown <broonie@...nel.org>
CC:     "knaack.h@....de" <knaack.h@....de>,
        "lars@...afoo.de" <lars@...afoo.de>,
        "pmeerw@...erw.net" <pmeerw@...erw.net>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Hermes Hsieh(謝旻劭_Pegatron) 
        <Hermes_Hsieh@...atroncorp.com>,
        "jesse.sung@...onical.com" <jesse.sung@...onical.com>,
        "jic23@...nel.org" <jic23@...nel.org>
Subject: [PATCH] ASoC: tas5805m: Add TAS5805M amplifier driver

From: Leslie Hsia <Leslie_Hsia@...atroncorp.com>

This is initial amplifier driver for TAS5805M.

Signed-off-by: Leslie Hsia <Leslie_Hsia@...atroncorp.com>
---
diff -uprN -X linux-4.15-vanilla/Documentation/dontdiff linux-4.15-vanilla/sound/soc/codecs/Kconfig linux-4.15/sound/soc/codecs/Kconfig
--- linux-4.15-vanilla/sound/soc/codecs/Kconfig 2020-03-12 21:21:05.179091822 +0800
+++ linux-4.15/sound/soc/codecs/Kconfig 2020-04-30 15:33:05.687598540 +0800
@@ -193,6 +193,7 @@ config SND_SOC_ALL_CODECS
        select SND_SOC_TAS5086 if I2C
        select SND_SOC_TAS571X if I2C
        select SND_SOC_TAS5720 if I2C
+       select SND_SOC_TAS5805M if I2C
        select SND_SOC_TAS6424 if I2C
        select SND_SOC_TDA7419 if I2C
        select SND_SOC_TFA9879 if I2C
@@ -1207,6 +1208,10 @@ config SND_SOC_TAS5086
        tristate "Texas Instruments TAS5086 speaker amplifier"
        depends on I2C

+config SND_SOC_TAS5805M
+       tristate "Texas Instruments TAS5805M Mono Audio amplifier"
+       depends on I2C
+
 config SND_SOC_TAS571X
        tristate "Texas Instruments TAS571x power amplifiers"
        depends on I2C
diff -uprN -X linux-4.15-vanilla/Documentation/dontdiff linux-4.15-vanilla/sound/soc/codecs/Makefile linux-4.15/sound/soc/codecs/Makefile
--- linux-4.15-vanilla/sound/soc/codecs/Makefile        2020-03-12 21:21:05.179091822 +0800
+++ linux-4.15/sound/soc/codecs/Makefile        2020-04-30 15:33:09.975593688 +0800
@@ -294,6 +294,7 @@ snd-soc-simple-amplifier-objs := simple-
 snd-soc-tpa6130a2-objs := tpa6130a2.o
 snd-soc-tas2552-objs := tas2552.o
 snd-soc-tas2562-objs := tas2562.o
+snd-soc-tas5805m-objs := tas5805m.o

 obj-$(CONFIG_SND_SOC_88PM860X) += snd-soc-88pm860x.o
 obj-$(CONFIG_SND_SOC_AB8500_CODEC)     += snd-soc-ab8500-codec.o
@@ -499,6 +500,7 @@ obj-$(CONFIG_SND_SOC_STAC9766)      += snd-so
 obj-$(CONFIG_SND_SOC_STI_SAS)  += snd-soc-sti-sas.o
 obj-$(CONFIG_SND_SOC_TAS2552)  += snd-soc-tas2552.o
 obj-$(CONFIG_SND_SOC_TAS2562)  += snd-soc-tas2562.o
+obj-$(CONFIG_SND_SOC_TAS5805M) += snd-soc-tas5805m.o
 obj-$(CONFIG_SND_SOC_TAS5086)  += snd-soc-tas5086.o
 obj-$(CONFIG_SND_SOC_TAS571X)  += snd-soc-tas571x.o
 obj-$(CONFIG_SND_SOC_TAS5720)  += snd-soc-tas5720.o
diff -uprN -X linux-4.15-vanilla/Documentation/dontdiff linux-4.15-vanilla/sound/soc/codecs/tas5805m.c linux-4.15/sound/soc/codecs/tas5805m.c
--- linux-4.15-vanilla/sound/soc/codecs/tas5805m.c      1970-01-01 08:00:00.000000000 +0800
+++ linux-4.15/sound/soc/codecs/tas5805m.c      2020-05-05 17:26:09.894332647 +0800
@@ -0,0 +1,264 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+//
+// tas5805m.c -- TAS5805M audio amplifier I2C driver
+//
+// Copyright (c) 2020 Pegatron Corp.
+//
+// Author: Leslie Hsia <Leslie_Hsia@...atroncorp.com>
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/init.h>
+#include <linux/acpi.h>
+#include <linux/gpio.h>
+#include <linux/i2c.h>
+#include <sound/soc.h>
+#include <linux/regmap.h>
+#include <linux/types.h>
+
+#define TAS5805M_REG_DEV_RESET         0x00
+#define TAS5805M_REG_DEV_CTL2          0x03
+#define TAS5805M_REG_DEV_BOOK          0x7F
+#define TAS5805M_REG_VOL_CTL           0x4C
+#define TAS5805M_DEV_STAT_CTL_MSK      (BIT(1) | BIT(0))
+#define TAS5805M_DEV_STAT_DSLEEP       0x00
+#define TAS5805M_DEV_STAT_SLEEP                0x01
+#define TAS5805M_DEV_STAT_HIZ          0x02
+#define TAS5805M_DEV_STAT_PLAY         0x03
+#define TAS5805M_DEV_STAT_RESET                0x00
+#define TAS5805M_DIG_VOL_DB            0x3D
+#define TAS5805M_DEV_BOOK_DEFAULT_PAGE 0x00
+#define TAS5805M_DRV_NAME              "TAS5805M"
+#define TAS5805M_AMP_DEV_NAME          "TAS5805M"
+
+enum ti_ampfilier_type {
+       TAS5805M,
+};
+
+struct tas5805m_priv {
+       struct regmap *regmap;
+       /* mutex for getting the mutex and release */
+       struct mutex lock;
+};
+
+const struct regmap_config tas5805m_regmap = {
+       .reg_bits = 8,
+       .val_bits = 8,
+       .cache_type = REGCACHE_RBTREE,
+};
+
+/* Initialize the TAS5805M and set the volume to -6.5db,
+ * and set it to Play mode.
+ */
+static const struct reg_sequence tas5805m_init_dsp[] = {
+       { TAS5805M_REG_DEV_CTL2, TAS5805M_DEV_STAT_DSLEEP },
+       { TAS5805M_REG_DEV_CTL2, TAS5805M_DEV_STAT_HIZ },
+       { TAS5805M_REG_DEV_CTL2, TAS5805M_DEV_STAT_DSLEEP },
+       /* set volume to -6.5dB */
+       { TAS5805M_REG_VOL_CTL,  TAS5805M_DIG_VOL_DB },
+       { TAS5805M_REG_DEV_CTL2, TAS5805M_DEV_STAT_PLAY },
+};
+
+/* Setting the TAS5805M state and save the config in the default page. */
+static int tas5805m_set_device_state(struct tas5805m_priv *tas5805m,
+                                       int state)
+{
+       int ret = 0;
+
+       ret = regmap_write(tas5805m->regmap, TAS5805M_REG_DEV_RESET,
+                               TAS5805M_DEV_STAT_RESET);
+       if (ret != 0)
+               return -EINVAL;
+
+       /* Saving the config to the default page of the default book */
+       ret = regmap_write(tas5805m->regmap,
+                       TAS5805M_REG_DEV_BOOK,
+                       TAS5805M_DEV_BOOK_DEFAULT_PAGE);
+       if (ret != 0)
+               return -EINVAL;
+
+       ret = regmap_write(tas5805m->regmap,
+                       TAS5805M_REG_DEV_RESET,
+                       TAS5805M_DEV_STAT_RESET);
+       if (ret != 0)
+               return -EINVAL;
+
+       ret = regmap_update_bits(tas5805m->regmap,
+                               TAS5805M_REG_DEV_CTL2,
+                               TAS5805M_DEV_STAT_CTL_MSK, state);
+       if (ret != 0)
+               return -EINVAL;
+
+       return ret;
+}
+
+/* Reset the TAS5805M and initialize TAS5805M again.*/
+static int tas5805m_reset(struct device *dev,
+                       struct tas5805m_priv *priv)
+{
+       int ret = 0;
+
+       ret = tas5805m_set_device_state(priv, TAS5805M_DEV_STAT_DSLEEP);
+       if (ret != 0) {
+               dev_err(dev, "Failed to set TAS5805M to Deep Sleep state: %d\n",
+                       ret);
+               return -EINVAL;
+       }
+
+       ret = tas5805m_set_device_state(priv, TAS5805M_DEV_STAT_HIZ);
+       if (ret != 0) {
+               dev_err(dev, "Failed to set TAS5805M to Hi-Z state: %d\n", ret);
+               return -EINVAL;
+       }
+
+       /* Load the settings */
+       ret = regmap_register_patch(priv->regmap,
+                               tas5805m_init_dsp,
+                               ARRAY_SIZE(tas5805m_init_dsp));
+       if (ret != 0) {
+               dev_err(dev, "Failed to initialize TAS5805M: %d\n", ret);
+               return -EINVAL;
+       }
+
+       return ret;
+}
+
+static int tas5805m_probe(struct device *dev, struct regmap *regmap)
+{
+       struct tas5805m_priv *tas5805m;
+
+       tas5805m = devm_kzalloc(dev, sizeof(struct tas5805m_priv), GFP_KERNEL);
+       if (!tas5805m)
+               return -ENOMEM;
+
+       dev_set_drvdata(dev, tas5805m);
+       tas5805m->regmap = regmap;
+
+       mutex_init(&tas5805m->lock);
+
+       tas5805m_reset(dev, tas5805m);
+
+       return 0;
+}
+
+static int tas5805m_i2c_probe(struct i2c_client *i2c,
+                               const struct i2c_device_id *id)
+{
+       struct tas5805m_priv *priv;
+       struct device *dev = &i2c->dev;
+       struct regmap_config config = tas5805m_regmap;
+       int ret;
+
+       priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+
+       if (!priv)
+               return -ENOMEM;
+
+       priv->regmap = devm_regmap_init_i2c(i2c, &config);
+
+       if (IS_ERR(priv->regmap)) {
+               ret = PTR_ERR(priv->regmap);
+               dev_err(&i2c->dev, "Failed to create regmap: %d\n", ret);
+               return ret;
+       }
+
+       i2c_set_clientdata(i2c, priv);
+
+       return tas5805m_probe(&i2c->dev, priv->regmap);
+}
+
+static int tas5805m_i2c_remove(struct i2c_client *i2c)
+{
+       return 0;
+}
+
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id tas5805m_acpi_match[] = {
+       {"TXNM5805", TAS5805M},
+       { },
+};
+MODULE_DEVICE_TABLE(acpi, tas5805m_acpi_match);
+#else
+#define st_accel_acpi_match NULL
+#endif
+
+static const struct i2c_device_id tas5805m_i2c_id[] = {
+       { TAS5805M_AMP_DEV_NAME, TAS5805M },
+       {},
+};
+MODULE_DEVICE_TABLE(i2c, tas5805m_i2c_id);
+
+/* Shutdown procedures, configure the TAS5805M_REG_DEV_CTL2 register
+ * via i2c control port, and bring down power supplies.
+ */
+#ifdef CONFIG_PM_SLEEP
+static int tas5805m_dsp_power_suspend(struct device *dev)
+{
+       int ret;
+       struct tas5805m_priv *tas5805m;
+
+       tas5805m = dev_get_drvdata(dev);
+       if (!tas5805m)
+               return -ENOMEM;
+
+       mutex_lock(&tas5805m->lock);
+       ret = tas5805m_set_device_state(tas5805m, TAS5805M_DEV_STAT_HIZ);
+       if (ret != 0) {
+               dev_err(dev, "Failed to set TAS5805M to Hi-Z state: %d\n", ret);
+               return -EINVAL;
+       }
+
+       mutex_unlock(&tas5805m->lock);
+
+       return 0;
+}
+
+/* Startup procedures,
+ * configure the pin with proper settings for i2c device address,
+ * binre up power supplies, set the device into Hiz state
+ * and enable DSP via i2c control port,
+ * initialize the DSP coefficient, then set the device to Play mode
+ */
+static int tas5805m_dsp_power_resume(struct device *dev)
+{
+       struct tas5805m_priv *tas5805m;
+
+       tas5805m = dev_get_drvdata(dev);
+       if (!tas5805m)
+               return -ENOMEM;
+
+       mutex_lock(&tas5805m->lock);
+       tas5805m_reset(dev, tas5805m);
+       mutex_unlock(&tas5805m->lock);
+
+       return 0;
+}
+
+static const struct dev_pm_ops tas5805m_dsp_power_pm = {
+       .suspend = tas5805m_dsp_power_suspend,
+       .resume = tas5805m_dsp_power_resume,
+};
+#define tas5805m_dsp_power_pm_ops (&tas5805m_dsp_power_pm)
+#else
+#define tas5805m_dsp_power_pm_ops NULL
+#endif
+
+static struct i2c_driver tas5805m_i2c_driver = {
+       .driver = {
+               .name = TAS5805M_DRV_NAME,
+               .acpi_match_table = ACPI_PTR(tas5805m_acpi_match),
+               .pm = tas5805m_dsp_power_pm_ops,
+       },
+       .probe = tas5805m_i2c_probe,
+       .remove = tas5805m_i2c_remove,
+       .id_table = tas5805m_i2c_id,
+};
+
+module_i2c_driver(tas5805m_i2c_driver);
+
+MODULE_AUTHOR("Leslie Hsia <Leslie_Hsia@...atroncorp.com>");
+MODULE_AUTHOR("Andy Liu <andy-liu@...com>");
+MODULE_DESCRIPTION("TAS5805M Audio Amplifier I2C Driver");
+MODULE_LICENSE("GPL v2");


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