sound/soc/codecs/max9759.c

   1 // SPDX-Licence-Identifier: GPL-2.0
   2 /*
   3  * MAX9759 Amplifier Driver
   4  *
   5  * Copyright (c) 2017 BayLibre, SAS.
   6  * Author: Neil Armstrong <narmstrong@baylibre.com>
   7  */
   8
   9 #include <linux/gpio/consumer.h>
  10 #include <linux/module.h>
  11 #include <sound/soc.h>
  12 #include <sound/soc-dapm.h>
  13 #include <sound/tlv.h>
  14
  15 #define DRV_NAME "max9759"
  16
  17 struct max9759 {
  18         struct gpio_desc *gpiod_shutdown;
  19         struct gpio_desc *gpiod_mute;
  20         struct gpio_descs *gpiod_gain;
  21         bool is_mute;
  22         unsigned int gain;
  23 };
  24
  25 static int pga_event(struct snd_soc_dapm_widget *w,
  26                      struct snd_kcontrol *control, int event)
  27 {
  28         struct snd_soc_component *c = snd_soc_dapm_to_component(w->dapm);
  29         struct max9759 *priv = snd_soc_component_get_drvdata(c);
  30
  31         if (SND_SOC_DAPM_EVENT_ON(event))
  32                 gpiod_set_value_cansleep(priv->gpiod_shutdown, 0);
  33         else
  34                 gpiod_set_value_cansleep(priv->gpiod_shutdown, 1);
  35
  36         return 0;
  37 }
  38
  39 /* From 6dB to 24dB in steps of 6dB */
  40 static const DECLARE_TLV_DB_SCALE(speaker_gain_tlv, 600, 600, 0);
  41
  42 static int speaker_gain_control_get(struct snd_kcontrol *kcontrol,
  43                                     struct snd_ctl_elem_value *ucontrol)
  44 {
  45         struct snd_soc_component *c = snd_soc_kcontrol_component(kcontrol);
  46         struct max9759 *priv = snd_soc_component_get_drvdata(c);
  47
  48         ucontrol->value.integer.value[0] = priv->gain;
  49
  50         return 0;
  51 }
  52
  53 static const bool speaker_gain_table[4][2] = {
  54         /* G1, G2 */
  55         {true, true},   /* +6dB */
  56         {false, true},  /* +12dB */
  57         {true, false},  /* +18dB */
  58         {false, false}, /* +24dB */
  59 };
  60
  61 static int speaker_gain_control_put(struct snd_kcontrol *kcontrol,
  62                                     struct snd_ctl_elem_value *ucontrol)
  63 {
  64         struct snd_soc_component *c = snd_soc_kcontrol_component(kcontrol);
  65         struct max9759 *priv = snd_soc_component_get_drvdata(c);
  66
  67         if (ucontrol->value.integer.value[0] < 0 ||
  68             ucontrol->value.integer.value[0] > 3)
  69                 return -EINVAL;
  70
  71         priv->gain = ucontrol->value.integer.value[0];
  72
  73         /* G1 */
  74         gpiod_set_value_cansleep(priv->gpiod_gain->desc[0],
  75                                  speaker_gain_table[priv->gain][0]);
  76         /* G2 */
  77         gpiod_set_value_cansleep(priv->gpiod_gain->desc[1],
  78                                  speaker_gain_table[priv->gain][1]);
  79
  80         return 1;
  81 }
  82
  83 static int speaker_mute_get(struct snd_kcontrol *kcontrol,
  84                             struct snd_ctl_elem_value *ucontrol)
  85 {
  86         struct snd_soc_component *c = snd_soc_kcontrol_component(kcontrol);
  87         struct max9759 *priv = snd_soc_component_get_drvdata(c);
  88
  89         ucontrol->value.integer.value[0] = !priv->is_mute;
  90
  91         return 0;
  92 }
  93
  94 static int speaker_mute_put(struct snd_kcontrol *kcontrol,
  95                             struct snd_ctl_elem_value *ucontrol)
  96 {
  97         struct snd_soc_component *c = snd_soc_kcontrol_component(kcontrol);
  98         struct max9759 *priv = snd_soc_component_get_drvdata(c);
  99
 100         priv->is_mute = !ucontrol->value.integer.value[0];
 101
 102         gpiod_set_value_cansleep(priv->gpiod_mute, priv->is_mute);
 103
 104         return 1;
 105 }
 106
 107 static const struct snd_kcontrol_new max9759_dapm_controls[] = {
 108         SOC_SINGLE_EXT_TLV("Speaker Gain Volume", 0, 0, 3, 0,
 109                            speaker_gain_control_get, speaker_gain_control_put,
 110                            speaker_gain_tlv),
 111         SOC_SINGLE_BOOL_EXT("Playback Switch", 0,
 112                             speaker_mute_get, speaker_mute_put),
 113 };
 114
 115 static const struct snd_soc_dapm_widget max9759_dapm_widgets[] = {
 116         SND_SOC_DAPM_INPUT("INL"),
 117         SND_SOC_DAPM_INPUT("INR"),
 118         SND_SOC_DAPM_PGA_E("PGA", SND_SOC_NOPM, 0, 0, NULL, 0, pga_event,
 119                            (SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD)),
 120         SND_SOC_DAPM_OUTPUT("OUTL"),
 121         SND_SOC_DAPM_OUTPUT("OUTR"),
 122 };
 123
 124 static const struct snd_soc_dapm_route max9759_dapm_routes[] = {
 125         { "PGA", NULL, "INL" },
 126         { "PGA", NULL, "INR" },
 127         { "OUTL", NULL, "PGA" },
 128         { "OUTR", NULL, "PGA" },
 129 };
 130
 131 static const struct snd_soc_component_driver max9759_component_driver = {
 132         .controls               = max9759_dapm_controls,
 133         .num_controls           = ARRAY_SIZE(max9759_dapm_controls),
 134         .dapm_widgets           = max9759_dapm_widgets,
 135         .num_dapm_widgets       = ARRAY_SIZE(max9759_dapm_widgets),
 136         .dapm_routes            = max9759_dapm_routes,
 137         .num_dapm_routes        = ARRAY_SIZE(max9759_dapm_routes),
 138 };
 139
 140 static int max9759_probe(struct platform_device *pdev)
 141 {
 142         struct device *dev = &pdev->dev;
 143         struct max9759 *priv;
 144         int err;
 145
 146         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 147         if (!priv)
 148                 return -ENOMEM;
 149
 150         platform_set_drvdata(pdev, priv);
 151
 152         priv->gpiod_shutdown = devm_gpiod_get(dev, "shutdown", GPIOD_OUT_HIGH);
 153         if (IS_ERR(priv->gpiod_shutdown)) {
 154                 err = PTR_ERR(priv->gpiod_shutdown);
 155                 if (err != -EPROBE_DEFER)
 156                         dev_err(dev, "Failed to get 'shutdown' gpio: %d", err);
 157                 return err;
 158         }
 159
 160         priv->gpiod_mute = devm_gpiod_get(dev, "mute", GPIOD_OUT_HIGH);
 161         if (IS_ERR(priv->gpiod_mute)) {
 162                 err = PTR_ERR(priv->gpiod_mute);
 163                 if (err != -EPROBE_DEFER)
 164                         dev_err(dev, "Failed to get 'mute' gpio: %d", err);
 165                 return err;
 166         }
 167         priv->is_mute = true;
 168
 169         priv->gpiod_gain = devm_gpiod_get_array(dev, "gain", GPIOD_OUT_HIGH);
 170         if (IS_ERR(priv->gpiod_gain)) {
 171                 err = PTR_ERR(priv->gpiod_gain);
 172                 if (err != -EPROBE_DEFER)
 173                         dev_err(dev, "Failed to get 'gain' gpios: %d", err);
 174                 return err;
 175         }
 176         priv->gain = 0;
 177
 178         if (priv->gpiod_gain->ndescs != 2) {
 179                 dev_err(dev, "Invalid 'gain' gpios count: %d",
 180                         priv->gpiod_gain->ndescs);
 181                 return -EINVAL;
 182         }
 183
 184         return devm_snd_soc_register_component(dev, &max9759_component_driver,
 185                                                NULL, 0);
 186 }
 187
 188 #ifdef CONFIG_OF
 189 static const struct of_device_id max9759_ids[] = {
 190         { .compatible = "maxim,max9759", },
 191         { }
 192 };
 193 MODULE_DEVICE_TABLE(of, max9759_ids);
 194 #endif
 195
 196 static struct platform_driver max9759_driver = {
 197         .driver = {
 198                 .name = DRV_NAME,
 199                 .of_match_table = of_match_ptr(max9759_ids),
 200         },
 201         .probe = max9759_probe,
 202 };
 203
 204 module_platform_driver(max9759_driver);
 205
 206 MODULE_DESCRIPTION("ASoC MAX9759 amplifier driver");
 207 MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>");
 208 MODULE_LICENSE("GPL");