256 lines
6.9 KiB
C
256 lines
6.9 KiB
C
/*
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* MAX9768 AMP driver
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*
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* Copyright (C) 2011, 2012 by Wolfram Sang, Pengutronix e.K.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; version 2 of the License.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/i2c.h>
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#include <linux/slab.h>
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#include <linux/gpio.h>
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#include <linux/regmap.h>
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#include <sound/core.h>
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#include <sound/soc.h>
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#include <sound/tlv.h>
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#include <sound/max9768.h>
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/* "Registers" */
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#define MAX9768_VOL 0
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#define MAX9768_CTRL 3
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/* Commands */
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#define MAX9768_CTRL_PWM 0x15
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#define MAX9768_CTRL_FILTERLESS 0x16
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struct max9768 {
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struct regmap *regmap;
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int mute_gpio;
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int shdn_gpio;
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u32 flags;
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};
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static struct reg_default max9768_default_regs[] = {
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{ 0, 0 },
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{ 3, MAX9768_CTRL_FILTERLESS},
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};
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static int max9768_get_gpio(struct snd_kcontrol *kcontrol,
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struct snd_ctl_elem_value *ucontrol)
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{
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struct snd_soc_codec *codec = snd_soc_kcontrol_codec(kcontrol);
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struct max9768 *max9768 = snd_soc_codec_get_drvdata(codec);
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int val = gpio_get_value_cansleep(max9768->mute_gpio);
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ucontrol->value.integer.value[0] = !val;
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return 0;
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}
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static int max9768_set_gpio(struct snd_kcontrol *kcontrol,
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struct snd_ctl_elem_value *ucontrol)
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{
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struct snd_soc_codec *codec = snd_soc_kcontrol_codec(kcontrol);
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struct max9768 *max9768 = snd_soc_codec_get_drvdata(codec);
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gpio_set_value_cansleep(max9768->mute_gpio, !ucontrol->value.integer.value[0]);
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return 0;
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}
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static const unsigned int volume_tlv[] = {
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TLV_DB_RANGE_HEAD(43),
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0, 0, TLV_DB_SCALE_ITEM(-16150, 0, 0),
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1, 1, TLV_DB_SCALE_ITEM(-9280, 0, 0),
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2, 2, TLV_DB_SCALE_ITEM(-9030, 0, 0),
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3, 3, TLV_DB_SCALE_ITEM(-8680, 0, 0),
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4, 4, TLV_DB_SCALE_ITEM(-8430, 0, 0),
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5, 5, TLV_DB_SCALE_ITEM(-8080, 0, 0),
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6, 6, TLV_DB_SCALE_ITEM(-7830, 0, 0),
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7, 7, TLV_DB_SCALE_ITEM(-7470, 0, 0),
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8, 8, TLV_DB_SCALE_ITEM(-7220, 0, 0),
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9, 9, TLV_DB_SCALE_ITEM(-6870, 0, 0),
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10, 10, TLV_DB_SCALE_ITEM(-6620, 0, 0),
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11, 11, TLV_DB_SCALE_ITEM(-6270, 0, 0),
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12, 12, TLV_DB_SCALE_ITEM(-6020, 0, 0),
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13, 13, TLV_DB_SCALE_ITEM(-5670, 0, 0),
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14, 14, TLV_DB_SCALE_ITEM(-5420, 0, 0),
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15, 17, TLV_DB_SCALE_ITEM(-5060, 250, 0),
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18, 18, TLV_DB_SCALE_ITEM(-4370, 0, 0),
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19, 19, TLV_DB_SCALE_ITEM(-4210, 0, 0),
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20, 20, TLV_DB_SCALE_ITEM(-3960, 0, 0),
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21, 21, TLV_DB_SCALE_ITEM(-3760, 0, 0),
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22, 22, TLV_DB_SCALE_ITEM(-3600, 0, 0),
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23, 23, TLV_DB_SCALE_ITEM(-3340, 0, 0),
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24, 24, TLV_DB_SCALE_ITEM(-3150, 0, 0),
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25, 25, TLV_DB_SCALE_ITEM(-2980, 0, 0),
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26, 26, TLV_DB_SCALE_ITEM(-2720, 0, 0),
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27, 27, TLV_DB_SCALE_ITEM(-2520, 0, 0),
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28, 30, TLV_DB_SCALE_ITEM(-2350, 190, 0),
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31, 31, TLV_DB_SCALE_ITEM(-1750, 0, 0),
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32, 34, TLV_DB_SCALE_ITEM(-1640, 100, 0),
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35, 37, TLV_DB_SCALE_ITEM(-1310, 110, 0),
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38, 39, TLV_DB_SCALE_ITEM(-990, 100, 0),
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40, 40, TLV_DB_SCALE_ITEM(-710, 0, 0),
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41, 41, TLV_DB_SCALE_ITEM(-600, 0, 0),
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42, 42, TLV_DB_SCALE_ITEM(-500, 0, 0),
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43, 43, TLV_DB_SCALE_ITEM(-340, 0, 0),
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44, 44, TLV_DB_SCALE_ITEM(-190, 0, 0),
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45, 45, TLV_DB_SCALE_ITEM(-50, 0, 0),
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46, 46, TLV_DB_SCALE_ITEM(50, 0, 0),
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47, 50, TLV_DB_SCALE_ITEM(120, 40, 0),
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51, 57, TLV_DB_SCALE_ITEM(290, 50, 0),
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58, 58, TLV_DB_SCALE_ITEM(650, 0, 0),
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59, 62, TLV_DB_SCALE_ITEM(700, 60, 0),
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63, 63, TLV_DB_SCALE_ITEM(950, 0, 0),
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};
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static const struct snd_kcontrol_new max9768_volume[] = {
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SOC_SINGLE_TLV("Playback Volume", MAX9768_VOL, 0, 63, 0, volume_tlv),
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};
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static const struct snd_kcontrol_new max9768_mute[] = {
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SOC_SINGLE_BOOL_EXT("Playback Switch", 0, max9768_get_gpio, max9768_set_gpio),
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};
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static const struct snd_soc_dapm_widget max9768_dapm_widgets[] = {
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SND_SOC_DAPM_INPUT("IN"),
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SND_SOC_DAPM_OUTPUT("OUT+"),
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SND_SOC_DAPM_OUTPUT("OUT-"),
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};
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static const struct snd_soc_dapm_route max9768_dapm_routes[] = {
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{ "OUT+", NULL, "IN" },
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{ "OUT-", NULL, "IN" },
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};
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static int max9768_probe(struct snd_soc_codec *codec)
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{
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struct max9768 *max9768 = snd_soc_codec_get_drvdata(codec);
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int ret;
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if (max9768->flags & MAX9768_FLAG_CLASSIC_PWM) {
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ret = snd_soc_write(codec, MAX9768_CTRL, MAX9768_CTRL_PWM);
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if (ret)
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return ret;
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}
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if (gpio_is_valid(max9768->mute_gpio)) {
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ret = snd_soc_add_codec_controls(codec, max9768_mute,
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ARRAY_SIZE(max9768_mute));
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if (ret)
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return ret;
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}
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return 0;
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}
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static struct snd_soc_codec_driver max9768_codec_driver = {
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.probe = max9768_probe,
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.controls = max9768_volume,
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.num_controls = ARRAY_SIZE(max9768_volume),
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.dapm_widgets = max9768_dapm_widgets,
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.num_dapm_widgets = ARRAY_SIZE(max9768_dapm_widgets),
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.dapm_routes = max9768_dapm_routes,
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.num_dapm_routes = ARRAY_SIZE(max9768_dapm_routes),
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};
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static const struct regmap_config max9768_i2c_regmap_config = {
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.reg_bits = 2,
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.val_bits = 6,
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.max_register = 3,
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.reg_defaults = max9768_default_regs,
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.num_reg_defaults = ARRAY_SIZE(max9768_default_regs),
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.cache_type = REGCACHE_RBTREE,
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};
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static int max9768_i2c_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct max9768 *max9768;
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struct max9768_pdata *pdata = client->dev.platform_data;
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int err;
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max9768 = devm_kzalloc(&client->dev, sizeof(*max9768), GFP_KERNEL);
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if (!max9768)
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return -ENOMEM;
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if (pdata) {
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/* Mute on powerup to avoid clicks */
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err = gpio_request_one(pdata->mute_gpio, GPIOF_INIT_HIGH, "MAX9768 Mute");
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max9768->mute_gpio = err ?: pdata->mute_gpio;
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/* Activate chip by releasing shutdown, enables I2C */
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err = gpio_request_one(pdata->shdn_gpio, GPIOF_INIT_HIGH, "MAX9768 Shutdown");
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max9768->shdn_gpio = err ?: pdata->shdn_gpio;
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max9768->flags = pdata->flags;
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} else {
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max9768->shdn_gpio = -EINVAL;
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max9768->mute_gpio = -EINVAL;
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}
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i2c_set_clientdata(client, max9768);
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max9768->regmap = devm_regmap_init_i2c(client, &max9768_i2c_regmap_config);
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if (IS_ERR(max9768->regmap)) {
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err = PTR_ERR(max9768->regmap);
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goto err_gpio_free;
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}
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err = snd_soc_register_codec(&client->dev, &max9768_codec_driver, NULL, 0);
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if (err)
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goto err_gpio_free;
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return 0;
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err_gpio_free:
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if (gpio_is_valid(max9768->shdn_gpio))
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gpio_free(max9768->shdn_gpio);
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if (gpio_is_valid(max9768->mute_gpio))
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gpio_free(max9768->mute_gpio);
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return err;
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}
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static int max9768_i2c_remove(struct i2c_client *client)
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{
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struct max9768 *max9768 = i2c_get_clientdata(client);
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snd_soc_unregister_codec(&client->dev);
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if (gpio_is_valid(max9768->shdn_gpio))
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gpio_free(max9768->shdn_gpio);
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if (gpio_is_valid(max9768->mute_gpio))
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gpio_free(max9768->mute_gpio);
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return 0;
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}
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static const struct i2c_device_id max9768_i2c_id[] = {
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{ "max9768", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, max9768_i2c_id);
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static struct i2c_driver max9768_i2c_driver = {
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.driver = {
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.name = "max9768",
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.owner = THIS_MODULE,
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},
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.probe = max9768_i2c_probe,
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.remove = max9768_i2c_remove,
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.id_table = max9768_i2c_id,
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};
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module_i2c_driver(max9768_i2c_driver);
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MODULE_AUTHOR("Wolfram Sang <w.sang@pengutronix.de>");
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MODULE_DESCRIPTION("ASoC MAX9768 amplifier driver");
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MODULE_LICENSE("GPL v2");
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