sound/soc/codecs/tpa6130a2.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * ALSA SoC Texas Instruments TPA6130A2 headset stereo amplifier driver
   4  *
   5  * Copyright (C) Nokia Corporation
   6  *
   7  * Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/errno.h>
  12 #include <linux/device.h>
  13 #include <linux/i2c.h>
  14 #include <linux/gpio.h>
  15 #include <linux/regulator/consumer.h>
  16 #include <linux/slab.h>
  17 #include <sound/tpa6130a2-plat.h>
  18 #include <sound/soc.h>
  19 #include <sound/tlv.h>
  20 #include <linux/of.h>
  21 #include <linux/of_gpio.h>
  22 #include <linux/regmap.h>
  23
  24 #include "tpa6130a2.h"
  25
  26 enum tpa_model {
  27         TPA6130A2,
  28         TPA6140A2,
  29 };
  30
  31 /* This struct is used to save the context */
  32 struct tpa6130a2_data {
  33         struct device *dev;
  34         struct regmap *regmap;
  35         struct regulator *supply;
  36         int power_gpio;
  37         enum tpa_model id;
  38 };
  39
  40 static int tpa6130a2_power(struct tpa6130a2_data *data, bool enable)
  41 {
  42         int ret = 0, ret2;
  43
  44         if (enable) {
  45                 ret = regulator_enable(data->supply);
  46                 if (ret != 0) {
  47                         dev_err(data->dev,
  48                                 "Failed to enable supply: %d\n", ret);
  49                         return ret;
  50                 }
  51                 /* Power on */
  52                 if (data->power_gpio >= 0)
  53                         gpio_set_value(data->power_gpio, 1);
  54
  55                 /* Sync registers */
  56                 regcache_cache_only(data->regmap, false);
  57                 ret = regcache_sync(data->regmap);
  58                 if (ret != 0) {
  59                         dev_err(data->dev,
  60                                 "Failed to sync registers: %d\n", ret);
  61                         regcache_cache_only(data->regmap, true);
  62                         if (data->power_gpio >= 0)
  63                                 gpio_set_value(data->power_gpio, 0);
  64                         ret2 = regulator_disable(data->supply);
  65                         if (ret2 != 0)
  66                                 dev_err(data->dev,
  67                                         "Failed to disable supply: %d\n", ret2);
  68                         return ret;
  69                 }
  70         } else {
  71                 /* Powered off device does not retain registers. While device
  72                  * is off, any register updates (i.e. volume changes) should
  73                  * happen in cache only.
  74                  */
  75                 regcache_mark_dirty(data->regmap);
  76                 regcache_cache_only(data->regmap, true);
  77
  78                 /* Power off */
  79                 if (data->power_gpio >= 0)
  80                         gpio_set_value(data->power_gpio, 0);
  81
  82                 ret = regulator_disable(data->supply);
  83                 if (ret != 0) {
  84                         dev_err(data->dev,
  85                                 "Failed to disable supply: %d\n", ret);
  86                         return ret;
  87                 }
  88         }
  89
  90         return ret;
  91 }
  92
  93 static int tpa6130a2_power_event(struct snd_soc_dapm_widget *w,
  94                                  struct snd_kcontrol *kctrl, int event)
  95 {
  96         struct snd_soc_component *c = snd_soc_dapm_to_component(w->dapm);
  97         struct tpa6130a2_data *data = snd_soc_component_get_drvdata(c);
  98
  99         if (SND_SOC_DAPM_EVENT_ON(event)) {
 100                 /* Before widget power up: turn chip on, sync registers */
 101                 return tpa6130a2_power(data, true);
 102         } else {
 103                 /* After widget power down: turn chip off */
 104                 return tpa6130a2_power(data, false);
 105         }
 106 }
 107
 108 /*
 109  * TPA6130 volume. From -59.5 to 4 dB with increasing step size when going
 110  * down in gain.
 111  */
 112 static const DECLARE_TLV_DB_RANGE(tpa6130_tlv,
 113         0, 1, TLV_DB_SCALE_ITEM(-5950, 600, 0),
 114         2, 3, TLV_DB_SCALE_ITEM(-5000, 250, 0),
 115         4, 5, TLV_DB_SCALE_ITEM(-4550, 160, 0),
 116         6, 7, TLV_DB_SCALE_ITEM(-4140, 190, 0),
 117         8, 9, TLV_DB_SCALE_ITEM(-3650, 120, 0),
 118         10, 11, TLV_DB_SCALE_ITEM(-3330, 160, 0),
 119         12, 13, TLV_DB_SCALE_ITEM(-3040, 180, 0),
 120         14, 20, TLV_DB_SCALE_ITEM(-2710, 110, 0),
 121         21, 37, TLV_DB_SCALE_ITEM(-1960, 74, 0),
 122         38, 63, TLV_DB_SCALE_ITEM(-720, 45, 0)
 123 );
 124
 125 static const struct snd_kcontrol_new tpa6130a2_controls[] = {
 126         SOC_SINGLE_TLV("Headphone Playback Volume",
 127                        TPA6130A2_REG_VOL_MUTE, 0, 0x3f, 0,
 128                        tpa6130_tlv),
 129 };
 130
 131 static const DECLARE_TLV_DB_RANGE(tpa6140_tlv,
 132         0, 8, TLV_DB_SCALE_ITEM(-5900, 400, 0),
 133         9, 16, TLV_DB_SCALE_ITEM(-2500, 200, 0),
 134         17, 31, TLV_DB_SCALE_ITEM(-1000, 100, 0)
 135 );
 136
 137 static const struct snd_kcontrol_new tpa6140a2_controls[] = {
 138         SOC_SINGLE_TLV("Headphone Playback Volume",
 139                        TPA6130A2_REG_VOL_MUTE, 1, 0x1f, 0,
 140                        tpa6140_tlv),
 141 };
 142
 143 static int tpa6130a2_component_probe(struct snd_soc_component *component)
 144 {
 145         struct tpa6130a2_data *data = snd_soc_component_get_drvdata(component);
 146
 147         if (data->id == TPA6140A2)
 148                 return snd_soc_add_component_controls(component,
 149                         tpa6140a2_controls, ARRAY_SIZE(tpa6140a2_controls));
 150         else
 151                 return snd_soc_add_component_controls(component,
 152                         tpa6130a2_controls, ARRAY_SIZE(tpa6130a2_controls));
 153 }
 154
 155 static const struct snd_soc_dapm_widget tpa6130a2_dapm_widgets[] = {
 156         SND_SOC_DAPM_INPUT("LEFTIN"),
 157         SND_SOC_DAPM_INPUT("RIGHTIN"),
 158         SND_SOC_DAPM_OUTPUT("HPLEFT"),
 159         SND_SOC_DAPM_OUTPUT("HPRIGHT"),
 160
 161         SND_SOC_DAPM_PGA("Left Mute", TPA6130A2_REG_VOL_MUTE,
 162                          TPA6130A2_HP_EN_L_SHIFT, 1, NULL, 0),
 163         SND_SOC_DAPM_PGA("Right Mute", TPA6130A2_REG_VOL_MUTE,
 164                          TPA6130A2_HP_EN_R_SHIFT, 1, NULL, 0),
 165         SND_SOC_DAPM_PGA("Left PGA", TPA6130A2_REG_CONTROL,
 166                          TPA6130A2_HP_EN_L_SHIFT, 0, NULL, 0),
 167         SND_SOC_DAPM_PGA("Right PGA", TPA6130A2_REG_CONTROL,
 168                          TPA6130A2_HP_EN_R_SHIFT, 0, NULL, 0),
 169
 170         SND_SOC_DAPM_SUPPLY("Power", TPA6130A2_REG_CONTROL,
 171                             TPA6130A2_SWS_SHIFT, 1, tpa6130a2_power_event,
 172                             SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
 173 };
 174
 175 static const struct snd_soc_dapm_route tpa6130a2_dapm_routes[] = {
 176         { "Left PGA", NULL, "LEFTIN" },
 177         { "Right PGA", NULL, "RIGHTIN" },
 178
 179         { "Left Mute", NULL, "Left PGA" },
 180         { "Right Mute", NULL, "Right PGA" },
 181
 182         { "HPLEFT", NULL, "Left Mute" },
 183         { "HPRIGHT", NULL, "Right Mute" },
 184
 185         { "Left PGA", NULL, "Power" },
 186         { "Right PGA", NULL, "Power" },
 187 };
 188
 189 static const struct snd_soc_component_driver tpa6130a2_component_driver = {
 190         .name = "tpa6130a2",
 191         .probe = tpa6130a2_component_probe,
 192         .dapm_widgets = tpa6130a2_dapm_widgets,
 193         .num_dapm_widgets = ARRAY_SIZE(tpa6130a2_dapm_widgets),
 194         .dapm_routes = tpa6130a2_dapm_routes,
 195         .num_dapm_routes = ARRAY_SIZE(tpa6130a2_dapm_routes),
 196 };
 197
 198 static const struct reg_default tpa6130a2_reg_defaults[] = {
 199         { TPA6130A2_REG_CONTROL, TPA6130A2_SWS },
 200         { TPA6130A2_REG_VOL_MUTE, TPA6130A2_MUTE_R | TPA6130A2_MUTE_L },
 201 };
 202
 203 static const struct regmap_config tpa6130a2_regmap_config = {
 204         .reg_bits = 8,
 205         .val_bits = 8,
 206         .max_register = TPA6130A2_REG_VERSION,
 207         .reg_defaults = tpa6130a2_reg_defaults,
 208         .num_reg_defaults = ARRAY_SIZE(tpa6130a2_reg_defaults),
 209         .cache_type = REGCACHE_RBTREE,
 210 };
 211
 212 static int tpa6130a2_probe(struct i2c_client *client,
 213                            const struct i2c_device_id *id)
 214 {
 215         struct device *dev;
 216         struct tpa6130a2_data *data;
 217         struct tpa6130a2_platform_data *pdata = client->dev.platform_data;
 218         struct device_node *np = client->dev.of_node;
 219         const char *regulator;
 220         unsigned int version;
 221         int ret;
 222
 223         dev = &client->dev;
 224
 225         data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
 226         if (!data)
 227                 return -ENOMEM;
 228
 229         data->dev = dev;
 230
 231         data->regmap = devm_regmap_init_i2c(client, &tpa6130a2_regmap_config);
 232         if (IS_ERR(data->regmap))
 233                 return PTR_ERR(data->regmap);
 234
 235         if (pdata) {
 236                 data->power_gpio = pdata->power_gpio;
 237         } else if (np) {
 238                 data->power_gpio = of_get_named_gpio(np, "power-gpio", 0);
 239         } else {
 240                 dev_err(dev, "Platform data not set\n");
 241                 dump_stack();
 242                 return -ENODEV;
 243         }
 244
 245         i2c_set_clientdata(client, data);
 246
 247         data->id = id->driver_data;
 248
 249         if (data->power_gpio >= 0) {
 250                 ret = devm_gpio_request(dev, data->power_gpio,
 251                                         "tpa6130a2 enable");
 252                 if (ret < 0) {
 253                         dev_err(dev, "Failed to request power GPIO (%d)\n",
 254                                 data->power_gpio);
 255                         return ret;
 256                 }
 257                 gpio_direction_output(data->power_gpio, 0);
 258         }
 259
 260         switch (data->id) {
 261         default:
 262                 dev_warn(dev, "Unknown TPA model (%d). Assuming 6130A2\n",
 263                          data->id);
 264                 fallthrough;
 265         case TPA6130A2:
 266                 regulator = "Vdd";
 267                 break;
 268         case TPA6140A2:
 269                 regulator = "AVdd";
 270                 break;
 271         }
 272
 273         data->supply = devm_regulator_get(dev, regulator);
 274         if (IS_ERR(data->supply)) {
 275                 ret = PTR_ERR(data->supply);
 276                 dev_err(dev, "Failed to request supply: %d\n", ret);
 277                 return ret;
 278         }
 279
 280         ret = tpa6130a2_power(data, true);
 281         if (ret != 0)
 282                 return ret;
 283
 284
 285         /* Read version */
 286         regmap_read(data->regmap, TPA6130A2_REG_VERSION, &version);
 287         version &= TPA6130A2_VERSION_MASK;
 288         if ((version != 1) && (version != 2))
 289                 dev_warn(dev, "UNTESTED version detected (%d)\n", version);
 290
 291         /* Disable the chip */
 292         ret = tpa6130a2_power(data, false);
 293         if (ret != 0)
 294                 return ret;
 295
 296         return devm_snd_soc_register_component(&client->dev,
 297                         &tpa6130a2_component_driver, NULL, 0);
 298 }
 299
 300 static const struct i2c_device_id tpa6130a2_id[] = {
 301         { "tpa6130a2", TPA6130A2 },
 302         { "tpa6140a2", TPA6140A2 },
 303         { }
 304 };
 305 MODULE_DEVICE_TABLE(i2c, tpa6130a2_id);
 306
 307 #if IS_ENABLED(CONFIG_OF)
 308 static const struct of_device_id tpa6130a2_of_match[] = {
 309         { .compatible = "ti,tpa6130a2", },
 310         { .compatible = "ti,tpa6140a2" },
 311         {},
 312 };
 313 MODULE_DEVICE_TABLE(of, tpa6130a2_of_match);
 314 #endif
 315
 316 static struct i2c_driver tpa6130a2_i2c_driver = {
 317         .driver = {
 318                 .name = "tpa6130a2",
 319                 .of_match_table = of_match_ptr(tpa6130a2_of_match),
 320         },
 321         .probe = tpa6130a2_probe,
 322         .id_table = tpa6130a2_id,
 323 };
 324
 325 module_i2c_driver(tpa6130a2_i2c_driver);
 326
 327 MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
 328 MODULE_DESCRIPTION("TPA6130A2 Headphone amplifier driver");
 329 MODULE_LICENSE("GPL");