sound/soc/codecs/tpa6130a2.c

   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
  39 enum tpa_model {
  40         TPA6130A2,
  41         TPA6140A2,
  42 };
  43
  44 /* This struct is used to save the context */
  45 struct 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
  53 static 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                         goto regcache_sync_failed;
  75                 }
  76         } else {
  77                 /* Powered off device does not retain registers. While device
  78                  * is off, any register updates (i.e. volume changes) should
  79                  * happen in cache only.
  80                  */
  81                 regcache_mark_dirty(data->regmap);
  82 regcache_sync_failed:
  83                 regcache_cache_only(data->regmap, true);
  84
  85                 /* Power off */
  86                 if (data->power_gpio >= 0)
  87                         gpio_set_value(data->power_gpio, 0);
  88
  89                 ret2 = regulator_disable(data->supply);
  90                 if (ret2 != 0) {
  91                         dev_err(data->dev,
  92                                 "Failed to disable supply: %d\n", ret2);
  93                         return ret ? ret : ret2;
  94                 }
  95         }
  96
  97         return ret;
  98 }
  99
 100 static int tpa6130a2_power_event(struct snd_soc_dapm_widget *w,
 101                                  struct snd_kcontrol *kctrl, int event)
 102 {
 103         struct snd_soc_component *c = snd_soc_dapm_to_component(w->dapm);
 104         struct tpa6130a2_data *data = snd_soc_component_get_drvdata(c);
 105
 106         if (SND_SOC_DAPM_EVENT_ON(event)) {
 107                 /* Before widget power up: turn chip on, sync registers */
 108                 return tpa6130a2_power(data, true);
 109         } else {
 110                 /* After widget power down: turn chip off */
 111                 return tpa6130a2_power(data, false);
 112         }
 113 }
 114
 115 /*
 116  * TPA6130 volume. From -59.5 to 4 dB with increasing step size when going
 117  * down in gain.
 118  */
 119 static const DECLARE_TLV_DB_RANGE(tpa6130_tlv,
 120         0, 1, TLV_DB_SCALE_ITEM(-5950, 600, 0),
 121         2, 3, TLV_DB_SCALE_ITEM(-5000, 250, 0),
 122         4, 5, TLV_DB_SCALE_ITEM(-4550, 160, 0),
 123         6, 7, TLV_DB_SCALE_ITEM(-4140, 190, 0),
 124         8, 9, TLV_DB_SCALE_ITEM(-3650, 120, 0),
 125         10, 11, TLV_DB_SCALE_ITEM(-3330, 160, 0),
 126         12, 13, TLV_DB_SCALE_ITEM(-3040, 180, 0),
 127         14, 20, TLV_DB_SCALE_ITEM(-2710, 110, 0),
 128         21, 37, TLV_DB_SCALE_ITEM(-1960, 74, 0),
 129         38, 63, TLV_DB_SCALE_ITEM(-720, 45, 0)
 130 );
 131
 132 static const struct snd_kcontrol_new tpa6130a2_controls[] = {
 133         SOC_SINGLE_TLV("Headphone Playback Volume",
 134                        TPA6130A2_REG_VOL_MUTE, 0, 0x3f, 0,
 135                        tpa6130_tlv),
 136 };
 137
 138 static const DECLARE_TLV_DB_RANGE(tpa6140_tlv,
 139         0, 8, TLV_DB_SCALE_ITEM(-5900, 400, 0),
 140         9, 16, TLV_DB_SCALE_ITEM(-2500, 200, 0),
 141         17, 31, TLV_DB_SCALE_ITEM(-1000, 100, 0)
 142 );
 143
 144 static const struct snd_kcontrol_new tpa6140a2_controls[] = {
 145         SOC_SINGLE_TLV("Headphone Playback Volume",
 146                        TPA6130A2_REG_VOL_MUTE, 1, 0x1f, 0,
 147                        tpa6140_tlv),
 148 };
 149
 150 static int tpa6130a2_component_probe(struct snd_soc_component *component)
 151 {
 152         struct tpa6130a2_data *data = snd_soc_component_get_drvdata(component);
 153
 154         if (data->id == TPA6140A2)
 155                 return snd_soc_add_component_controls(component,
 156                         tpa6140a2_controls, ARRAY_SIZE(tpa6140a2_controls));
 157         else
 158                 return snd_soc_add_component_controls(component,
 159                         tpa6130a2_controls, ARRAY_SIZE(tpa6130a2_controls));
 160 }
 161
 162 static const struct snd_soc_dapm_widget tpa6130a2_dapm_widgets[] = {
 163         SND_SOC_DAPM_INPUT("LEFTIN"),
 164         SND_SOC_DAPM_INPUT("RIGHTIN"),
 165         SND_SOC_DAPM_OUTPUT("HPLEFT"),
 166         SND_SOC_DAPM_OUTPUT("HPRIGHT"),
 167
 168         SND_SOC_DAPM_PGA("Left Mute", TPA6130A2_REG_VOL_MUTE,
 169                          TPA6130A2_HP_EN_L_SHIFT, 1, NULL, 0),
 170         SND_SOC_DAPM_PGA("Right Mute", TPA6130A2_REG_VOL_MUTE,
 171                          TPA6130A2_HP_EN_R_SHIFT, 1, NULL, 0),
 172         SND_SOC_DAPM_PGA("Left PGA", TPA6130A2_REG_CONTROL,
 173                          TPA6130A2_HP_EN_L_SHIFT, 0, NULL, 0),
 174         SND_SOC_DAPM_PGA("Right PGA", TPA6130A2_REG_CONTROL,
 175                          TPA6130A2_HP_EN_R_SHIFT, 0, NULL, 0),
 176
 177         SND_SOC_DAPM_SUPPLY("Power", TPA6130A2_REG_CONTROL,
 178                             TPA6130A2_SWS_SHIFT, 1, tpa6130a2_power_event,
 179                             SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
 180 };
 181
 182 static const struct snd_soc_dapm_route tpa6130a2_dapm_routes[] = {
 183         { "Left PGA", NULL, "LEFTIN" },
 184         { "Right PGA", NULL, "RIGHTIN" },
 185
 186         { "Left Mute", NULL, "Left PGA" },
 187         { "Right Mute", NULL, "Right PGA" },
 188
 189         { "HPLEFT", NULL, "Left Mute" },
 190         { "HPRIGHT", NULL, "Right Mute" },
 191
 192         { "Left PGA", NULL, "Power" },
 193         { "Right PGA", NULL, "Power" },
 194 };
 195
 196 struct snd_soc_component_driver tpa6130a2_component_driver = {
 197         .name = "tpa6130a2",
 198         .probe = tpa6130a2_component_probe,
 199         .dapm_widgets = tpa6130a2_dapm_widgets,
 200         .num_dapm_widgets = ARRAY_SIZE(tpa6130a2_dapm_widgets),
 201         .dapm_routes = tpa6130a2_dapm_routes,
 202         .num_dapm_routes = ARRAY_SIZE(tpa6130a2_dapm_routes),
 203 };
 204
 205 static const struct reg_default tpa6130a2_reg_defaults[] = {
 206         { TPA6130A2_REG_CONTROL, TPA6130A2_SWS },
 207         { TPA6130A2_REG_VOL_MUTE, TPA6130A2_MUTE_R | TPA6130A2_MUTE_L },
 208 };
 209
 210 static const struct regmap_config tpa6130a2_regmap_config = {
 211         .reg_bits = 8,
 212         .val_bits = 8,
 213         .max_register = TPA6130A2_REG_VERSION,
 214         .reg_defaults = tpa6130a2_reg_defaults,
 215         .num_reg_defaults = ARRAY_SIZE(tpa6130a2_reg_defaults),
 216         .cache_type = REGCACHE_RBTREE,
 217 };
 218
 219 static int tpa6130a2_probe(struct i2c_client *client,
 220                            const struct i2c_device_id *id)
 221 {
 222         struct device *dev;
 223         struct tpa6130a2_data *data;
 224         struct tpa6130a2_platform_data *pdata = client->dev.platform_data;
 225         struct device_node *np = client->dev.of_node;
 226         const char *regulator;
 227         unsigned int version;
 228         int ret;
 229
 230         dev = &client->dev;
 231
 232         data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
 233         if (!data)
 234                 return -ENOMEM;
 235
 236         data->dev = dev;
 237
 238         data->regmap = devm_regmap_init_i2c(client, &tpa6130a2_regmap_config);
 239         if (IS_ERR(data->regmap))
 240                 return PTR_ERR(data->regmap);
 241
 242         if (pdata) {
 243                 data->power_gpio = pdata->power_gpio;
 244         } else if (np) {
 245                 data->power_gpio = of_get_named_gpio(np, "power-gpio", 0);
 246         } else {
 247                 dev_err(dev, "Platform data not set\n");
 248                 dump_stack();
 249                 return -ENODEV;
 250         }
 251
 252         i2c_set_clientdata(client, data);
 253
 254         data->id = id->driver_data;
 255
 256         if (data->power_gpio >= 0) {
 257                 ret = devm_gpio_request(dev, data->power_gpio,
 258                                         "tpa6130a2 enable");
 259                 if (ret < 0) {
 260                         dev_err(dev, "Failed to request power GPIO (%d)\n",
 261                                 data->power_gpio);
 262                         return ret;
 263                 }
 264                 gpio_direction_output(data->power_gpio, 0);
 265         }
 266
 267         switch (data->id) {
 268         default:
 269                 dev_warn(dev, "Unknown TPA model (%d). Assuming 6130A2\n",
 270                          data->id);
 271         case TPA6130A2:
 272                 regulator = "Vdd";
 273                 break;
 274         case TPA6140A2:
 275                 regulator = "AVdd";
 276                 break;
 277         }
 278
 279         data->supply = devm_regulator_get(dev, regulator);
 280         if (IS_ERR(data->supply)) {
 281                 ret = PTR_ERR(data->supply);
 282                 dev_err(dev, "Failed to request supply: %d\n", ret);
 283                 return ret;
 284         }
 285
 286         ret = tpa6130a2_power(data, true);
 287         if (ret != 0)
 288                 return ret;
 289
 290
 291         /* Read version */
 292         regmap_read(data->regmap, TPA6130A2_REG_VERSION, &version);
 293         version &= TPA6130A2_VERSION_MASK;
 294         if ((version != 1) && (version != 2))
 295                 dev_warn(dev, "UNTESTED version detected (%d)\n", version);
 296
 297         /* Disable the chip */
 298         ret = tpa6130a2_power(data, false);
 299         if (ret != 0)
 300                 return ret;
 301
 302         return devm_snd_soc_register_component(&client->dev,
 303                         &tpa6130a2_component_driver, NULL, 0);
 304 }
 305
 306 static const struct i2c_device_id tpa6130a2_id[] = {
 307         { "tpa6130a2", TPA6130A2 },
 308         { "tpa6140a2", TPA6140A2 },
 309         { }
 310 };
 311 MODULE_DEVICE_TABLE(i2c, tpa6130a2_id);
 312
 313 #if IS_ENABLED(CONFIG_OF)
 314 static const struct of_device_id tpa6130a2_of_match[] = {
 315         { .compatible = "ti,tpa6130a2", },
 316         { .compatible = "ti,tpa6140a2" },
 317         {},
 318 };
 319 MODULE_DEVICE_TABLE(of, tpa6130a2_of_match);
 320 #endif
 321
 322 static struct i2c_driver tpa6130a2_i2c_driver = {
 323         .driver = {
 324                 .name = "tpa6130a2",
 325                 .of_match_table = of_match_ptr(tpa6130a2_of_match),
 326         },
 327         .probe = tpa6130a2_probe,
 328         .id_table = tpa6130a2_id,
 329 };
 330
 331 module_i2c_driver(tpa6130a2_i2c_driver);
 332
 333 MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
 334 MODULE_DESCRIPTION("TPA6130A2 Headphone amplifier driver");
 335 MODULE_LICENSE("GPL");