linux/sound/soc/codecs/tpa6130a2.c
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   1/*
   2 * ALSA SoC Texas Instruments TPA6130A2 headset stereo amplifier driver
   3 *
   4 * Copyright (C) Nokia Corporation
   5 *
   6 * Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
   7 *
   8 * This program is free software; you can redistribute it and/or
   9 * modify it under the terms of the GNU General Public License
  10 * version 2 as published by the Free Software Foundation.
  11 *
  12 * This program is distributed in the hope that it will be useful, but
  13 * WITHOUT ANY WARRANTY; without even the implied warranty of
  14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15 * General Public License for more details.
  16 *
  17 * You should have received a copy of the GNU General Public License
  18 * along with this program; if not, write to the Free Software
  19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  20 * 02110-1301 USA
  21 */
  22
  23#include <linux/module.h>
  24#include <linux/errno.h>
  25#include <linux/device.h>
  26#include <linux/i2c.h>
  27#include <linux/gpio.h>
  28#include <linux/regulator/consumer.h>
  29#include <linux/slab.h>
  30#include <sound/tpa6130a2-plat.h>
  31#include <sound/soc.h>
  32#include <sound/tlv.h>
  33#include <linux/of.h>
  34#include <linux/of_gpio.h>
  35#include <linux/regmap.h>
  36
  37#include "tpa6130a2.h"
  38
  39enum tpa_model {
  40        TPA6130A2,
  41        TPA6140A2,
  42};
  43
  44/* This struct is used to save the context */
  45struct tpa6130a2_data {
  46        struct device *dev;
  47        struct regmap *regmap;
  48        struct regulator *supply;
  49        int power_gpio;
  50        enum tpa_model id;
  51};
  52
  53static int tpa6130a2_power(struct tpa6130a2_data *data, bool enable)
  54{
  55        int ret = 0, ret2;
  56
  57        if (enable) {
  58                ret = regulator_enable(data->supply);
  59                if (ret != 0) {
  60                        dev_err(data->dev,
  61                                "Failed to enable supply: %d\n", ret);
  62                        return ret;
  63                }
  64                /* Power on */
  65                if (data->power_gpio >= 0)
  66                        gpio_set_value(data->power_gpio, 1);
  67
  68                /* Sync registers */
  69                regcache_cache_only(data->regmap, false);
  70                ret = regcache_sync(data->regmap);
  71                if (ret != 0) {
  72                        dev_err(data->dev,
  73                                "Failed to sync registers: %d\n", ret);
  74                        regcache_cache_only(data->regmap, true);
  75                        if (data->power_gpio >= 0)
  76                                gpio_set_value(data->power_gpio, 0);
  77                        ret2 = regulator_disable(data->supply);
  78                        if (ret2 != 0)
  79                                dev_err(data->dev,
  80                                        "Failed to disable supply: %d\n", ret2);
  81                        return ret;
  82                }
  83        } else {
  84                /* Powered off device does not retain registers. While device
  85                 * is off, any register updates (i.e. volume changes) should
  86                 * happen in cache only.
  87                 */
  88                regcache_mark_dirty(data->regmap);
  89                regcache_cache_only(data->regmap, true);
  90
  91                /* Power off */
  92                if (data->power_gpio >= 0)
  93                        gpio_set_value(data->power_gpio, 0);
  94
  95                ret = regulator_disable(data->supply);
  96                if (ret != 0) {
  97                        dev_err(data->dev,
  98                                "Failed to disable supply: %d\n", ret);
  99                        return ret;
 100                }
 101        }
 102
 103        return ret;
 104}
 105
 106static int tpa6130a2_power_event(struct snd_soc_dapm_widget *w,
 107                                 struct snd_kcontrol *kctrl, int event)
 108{
 109        struct snd_soc_component *c = snd_soc_dapm_to_component(w->dapm);
 110        struct tpa6130a2_data *data = snd_soc_component_get_drvdata(c);
 111
 112        if (SND_SOC_DAPM_EVENT_ON(event)) {
 113                /* Before widget power up: turn chip on, sync registers */
 114                return tpa6130a2_power(data, true);
 115        } else {
 116                /* After widget power down: turn chip off */
 117                return tpa6130a2_power(data, false);
 118        }
 119}
 120
 121/*
 122 * TPA6130 volume. From -59.5 to 4 dB with increasing step size when going
 123 * down in gain.
 124 */
 125static const DECLARE_TLV_DB_RANGE(tpa6130_tlv,
 126        0, 1, TLV_DB_SCALE_ITEM(-5950, 600, 0),
 127        2, 3, TLV_DB_SCALE_ITEM(-5000, 250, 0),
 128        4, 5, TLV_DB_SCALE_ITEM(-4550, 160, 0),
 129        6, 7, TLV_DB_SCALE_ITEM(-4140, 190, 0),
 130        8, 9, TLV_DB_SCALE_ITEM(-3650, 120, 0),
 131        10, 11, TLV_DB_SCALE_ITEM(-3330, 160, 0),
 132        12, 13, TLV_DB_SCALE_ITEM(-3040, 180, 0),
 133        14, 20, TLV_DB_SCALE_ITEM(-2710, 110, 0),
 134        21, 37, TLV_DB_SCALE_ITEM(-1960, 74, 0),
 135        38, 63, TLV_DB_SCALE_ITEM(-720, 45, 0)
 136);
 137
 138static const struct snd_kcontrol_new tpa6130a2_controls[] = {
 139        SOC_SINGLE_TLV("Headphone Playback Volume",
 140                       TPA6130A2_REG_VOL_MUTE, 0, 0x3f, 0,
 141                       tpa6130_tlv),
 142};
 143
 144static const DECLARE_TLV_DB_RANGE(tpa6140_tlv,
 145        0, 8, TLV_DB_SCALE_ITEM(-5900, 400, 0),
 146        9, 16, TLV_DB_SCALE_ITEM(-2500, 200, 0),
 147        17, 31, TLV_DB_SCALE_ITEM(-1000, 100, 0)
 148);
 149
 150static const struct snd_kcontrol_new tpa6140a2_controls[] = {
 151        SOC_SINGLE_TLV("Headphone Playback Volume",
 152                       TPA6130A2_REG_VOL_MUTE, 1, 0x1f, 0,
 153                       tpa6140_tlv),
 154};
 155
 156static int tpa6130a2_component_probe(struct snd_soc_component *component)
 157{
 158        struct tpa6130a2_data *data = snd_soc_component_get_drvdata(component);
 159
 160        if (data->id == TPA6140A2)
 161                return snd_soc_add_component_controls(component,
 162                        tpa6140a2_controls, ARRAY_SIZE(tpa6140a2_controls));
 163        else
 164                return snd_soc_add_component_controls(component,
 165                        tpa6130a2_controls, ARRAY_SIZE(tpa6130a2_controls));
 166}
 167
 168static const struct snd_soc_dapm_widget tpa6130a2_dapm_widgets[] = {
 169        SND_SOC_DAPM_INPUT("LEFTIN"),
 170        SND_SOC_DAPM_INPUT("RIGHTIN"),
 171        SND_SOC_DAPM_OUTPUT("HPLEFT"),
 172        SND_SOC_DAPM_OUTPUT("HPRIGHT"),
 173
 174        SND_SOC_DAPM_PGA("Left Mute", TPA6130A2_REG_VOL_MUTE,
 175                         TPA6130A2_HP_EN_L_SHIFT, 1, NULL, 0),
 176        SND_SOC_DAPM_PGA("Right Mute", TPA6130A2_REG_VOL_MUTE,
 177                         TPA6130A2_HP_EN_R_SHIFT, 1, NULL, 0),
 178        SND_SOC_DAPM_PGA("Left PGA", TPA6130A2_REG_CONTROL,
 179                         TPA6130A2_HP_EN_L_SHIFT, 0, NULL, 0),
 180        SND_SOC_DAPM_PGA("Right PGA", TPA6130A2_REG_CONTROL,
 181                         TPA6130A2_HP_EN_R_SHIFT, 0, NULL, 0),
 182
 183        SND_SOC_DAPM_SUPPLY("Power", TPA6130A2_REG_CONTROL,
 184                            TPA6130A2_SWS_SHIFT, 1, tpa6130a2_power_event,
 185                            SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
 186};
 187
 188static const struct snd_soc_dapm_route tpa6130a2_dapm_routes[] = {
 189        { "Left PGA", NULL, "LEFTIN" },
 190        { "Right PGA", NULL, "RIGHTIN" },
 191
 192        { "Left Mute", NULL, "Left PGA" },
 193        { "Right Mute", NULL, "Right PGA" },
 194
 195        { "HPLEFT", NULL, "Left Mute" },
 196        { "HPRIGHT", NULL, "Right Mute" },
 197
 198        { "Left PGA", NULL, "Power" },
 199        { "Right PGA", NULL, "Power" },
 200};
 201
 202static const struct snd_soc_component_driver tpa6130a2_component_driver = {
 203        .name = "tpa6130a2",
 204        .probe = tpa6130a2_component_probe,
 205        .dapm_widgets = tpa6130a2_dapm_widgets,
 206        .num_dapm_widgets = ARRAY_SIZE(tpa6130a2_dapm_widgets),
 207        .dapm_routes = tpa6130a2_dapm_routes,
 208        .num_dapm_routes = ARRAY_SIZE(tpa6130a2_dapm_routes),
 209};
 210
 211static const struct reg_default tpa6130a2_reg_defaults[] = {
 212        { TPA6130A2_REG_CONTROL, TPA6130A2_SWS },
 213        { TPA6130A2_REG_VOL_MUTE, TPA6130A2_MUTE_R | TPA6130A2_MUTE_L },
 214};
 215
 216static const struct regmap_config tpa6130a2_regmap_config = {
 217        .reg_bits = 8,
 218        .val_bits = 8,
 219        .max_register = TPA6130A2_REG_VERSION,
 220        .reg_defaults = tpa6130a2_reg_defaults,
 221        .num_reg_defaults = ARRAY_SIZE(tpa6130a2_reg_defaults),
 222        .cache_type = REGCACHE_RBTREE,
 223};
 224
 225static int tpa6130a2_probe(struct i2c_client *client,
 226                           const struct i2c_device_id *id)
 227{
 228        struct device *dev;
 229        struct tpa6130a2_data *data;
 230        struct tpa6130a2_platform_data *pdata = client->dev.platform_data;
 231        struct device_node *np = client->dev.of_node;
 232        const char *regulator;
 233        unsigned int version;
 234        int ret;
 235
 236        dev = &client->dev;
 237
 238        data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
 239        if (!data)
 240                return -ENOMEM;
 241
 242        data->dev = dev;
 243
 244        data->regmap = devm_regmap_init_i2c(client, &tpa6130a2_regmap_config);
 245        if (IS_ERR(data->regmap))
 246                return PTR_ERR(data->regmap);
 247
 248        if (pdata) {
 249                data->power_gpio = pdata->power_gpio;
 250        } else if (np) {
 251                data->power_gpio = of_get_named_gpio(np, "power-gpio", 0);
 252        } else {
 253                dev_err(dev, "Platform data not set\n");
 254                dump_stack();
 255                return -ENODEV;
 256        }
 257
 258        i2c_set_clientdata(client, data);
 259
 260        data->id = id->driver_data;
 261
 262        if (data->power_gpio >= 0) {
 263                ret = devm_gpio_request(dev, data->power_gpio,
 264                                        "tpa6130a2 enable");
 265                if (ret < 0) {
 266                        dev_err(dev, "Failed to request power GPIO (%d)\n",
 267                                data->power_gpio);
 268                        return ret;
 269                }
 270                gpio_direction_output(data->power_gpio, 0);
 271        }
 272
 273        switch (data->id) {
 274        default:
 275                dev_warn(dev, "Unknown TPA model (%d). Assuming 6130A2\n",
 276                         data->id);
 277        case TPA6130A2:
 278                regulator = "Vdd";
 279                break;
 280        case TPA6140A2:
 281                regulator = "AVdd";
 282                break;
 283        }
 284
 285        data->supply = devm_regulator_get(dev, regulator);
 286        if (IS_ERR(data->supply)) {
 287                ret = PTR_ERR(data->supply);
 288                dev_err(dev, "Failed to request supply: %d\n", ret);
 289                return ret;
 290        }
 291
 292        ret = tpa6130a2_power(data, true);
 293        if (ret != 0)
 294                return ret;
 295
 296
 297        /* Read version */
 298        regmap_read(data->regmap, TPA6130A2_REG_VERSION, &version);
 299        version &= TPA6130A2_VERSION_MASK;
 300        if ((version != 1) && (version != 2))
 301                dev_warn(dev, "UNTESTED version detected (%d)\n", version);
 302
 303        /* Disable the chip */
 304        ret = tpa6130a2_power(data, false);
 305        if (ret != 0)
 306                return ret;
 307
 308        return devm_snd_soc_register_component(&client->dev,
 309                        &tpa6130a2_component_driver, NULL, 0);
 310}
 311
 312static const struct i2c_device_id tpa6130a2_id[] = {
 313        { "tpa6130a2", TPA6130A2 },
 314        { "tpa6140a2", TPA6140A2 },
 315        { }
 316};
 317MODULE_DEVICE_TABLE(i2c, tpa6130a2_id);
 318
 319#if IS_ENABLED(CONFIG_OF)
 320static const struct of_device_id tpa6130a2_of_match[] = {
 321        { .compatible = "ti,tpa6130a2", },
 322        { .compatible = "ti,tpa6140a2" },
 323        {},
 324};
 325MODULE_DEVICE_TABLE(of, tpa6130a2_of_match);
 326#endif
 327
 328static struct i2c_driver tpa6130a2_i2c_driver = {
 329        .driver = {
 330                .name = "tpa6130a2",
 331                .of_match_table = of_match_ptr(tpa6130a2_of_match),
 332        },
 333        .probe = tpa6130a2_probe,
 334        .id_table = tpa6130a2_id,
 335};
 336
 337module_i2c_driver(tpa6130a2_i2c_driver);
 338
 339MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
 340MODULE_DESCRIPTION("TPA6130A2 Headphone amplifier driver");
 341MODULE_LICENSE("GPL");
 342
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