1 // SPDX-License-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] > 3) 68 return -EINVAL; 69 70 priv->gain = ucontrol->value.integer.value[0]; 71 72 /* G1 */ 73 gpiod_set_value_cansleep(priv->gpiod_gain->desc[0], 74 speaker_gain_table[priv->gain][0]); 75 /* G2 */ 76 gpiod_set_value_cansleep(priv->gpiod_gain->desc[1], 77 speaker_gain_table[priv->gain][1]); 78 79 return 1; 80 } 81 82 static int speaker_mute_get(struct snd_kcontrol *kcontrol, 83 struct snd_ctl_elem_value *ucontrol) 84 { 85 struct snd_soc_component *c = snd_soc_kcontrol_component(kcontrol); 86 struct max9759 *priv = snd_soc_component_get_drvdata(c); 87 88 ucontrol->value.integer.value[0] = !priv->is_mute; 89 90 return 0; 91 } 92 93 static int speaker_mute_put(struct snd_kcontrol *kcontrol, 94 struct snd_ctl_elem_value *ucontrol) 95 { 96 struct snd_soc_component *c = snd_soc_kcontrol_component(kcontrol); 97 struct max9759 *priv = snd_soc_component_get_drvdata(c); 98 99 priv->is_mute = !ucontrol->value.integer.value[0]; 100 101 gpiod_set_value_cansleep(priv->gpiod_mute, priv->is_mute); 102 103 return 1; 104 } 105 106 static const struct snd_kcontrol_new max9759_dapm_controls[] = { 107 SOC_SINGLE_EXT_TLV("Speaker Gain Volume", 0, 0, 3, 0, 108 speaker_gain_control_get, speaker_gain_control_put, 109 speaker_gain_tlv), 110 SOC_SINGLE_BOOL_EXT("Playback Switch", 0, 111 speaker_mute_get, speaker_mute_put), 112 }; 113 114 static const struct snd_soc_dapm_widget max9759_dapm_widgets[] = { 115 SND_SOC_DAPM_INPUT("INL"), 116 SND_SOC_DAPM_INPUT("INR"), 117 SND_SOC_DAPM_PGA_E("PGA", SND_SOC_NOPM, 0, 0, NULL, 0, pga_event, 118 (SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD)), 119 SND_SOC_DAPM_OUTPUT("OUTL"), 120 SND_SOC_DAPM_OUTPUT("OUTR"), 121 }; 122 123 static const struct snd_soc_dapm_route max9759_dapm_routes[] = { 124 { "PGA", NULL, "INL" }, 125 { "PGA", NULL, "INR" }, 126 { "OUTL", NULL, "PGA" }, 127 { "OUTR", NULL, "PGA" }, 128 }; 129 130 static const struct snd_soc_component_driver max9759_component_driver = { 131 .controls = max9759_dapm_controls, 132 .num_controls = ARRAY_SIZE(max9759_dapm_controls), 133 .dapm_widgets = max9759_dapm_widgets, 134 .num_dapm_widgets = ARRAY_SIZE(max9759_dapm_widgets), 135 .dapm_routes = max9759_dapm_routes, 136 .num_dapm_routes = ARRAY_SIZE(max9759_dapm_routes), 137 }; 138 139 static int max9759_probe(struct platform_device *pdev) 140 { 141 struct device *dev = &pdev->dev; 142 struct max9759 *priv; 143 144 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); 145 if (!priv) 146 return -ENOMEM; 147 148 platform_set_drvdata(pdev, priv); 149 150 priv->gpiod_shutdown = devm_gpiod_get(dev, "shutdown", GPIOD_OUT_HIGH); 151 if (IS_ERR(priv->gpiod_shutdown)) 152 return dev_err_probe(dev, PTR_ERR(priv->gpiod_shutdown), 153 "Failed to get 'shutdown' gpio"); 154 155 priv->gpiod_mute = devm_gpiod_get(dev, "mute", GPIOD_OUT_HIGH); 156 if (IS_ERR(priv->gpiod_mute)) 157 return dev_err_probe(dev, PTR_ERR(priv->gpiod_mute), 158 "Failed to get 'mute' gpio"); 159 priv->is_mute = true; 160 161 priv->gpiod_gain = devm_gpiod_get_array(dev, "gain", GPIOD_OUT_HIGH); 162 if (IS_ERR(priv->gpiod_gain)) 163 return dev_err_probe(dev, PTR_ERR(priv->gpiod_gain), 164 "Failed to get 'gain' gpios"); 165 priv->gain = 0; 166 167 if (priv->gpiod_gain->ndescs != 2) { 168 dev_err(dev, "Invalid 'gain' gpios count: %d", 169 priv->gpiod_gain->ndescs); 170 return -EINVAL; 171 } 172 173 return devm_snd_soc_register_component(dev, &max9759_component_driver, 174 NULL, 0); 175 } 176 177 #ifdef CONFIG_OF 178 static const struct of_device_id max9759_ids[] = { 179 { .compatible = "maxim,max9759", }, 180 { } 181 }; 182 MODULE_DEVICE_TABLE(of, max9759_ids); 183 #endif 184 185 static struct platform_driver max9759_driver = { 186 .driver = { 187 .name = DRV_NAME, 188 .of_match_table = of_match_ptr(max9759_ids), 189 }, 190 .probe = max9759_probe, 191 }; 192 193 module_platform_driver(max9759_driver); 194 195 MODULE_DESCRIPTION("ASoC MAX9759 amplifier driver"); 196 MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>"); 197 MODULE_LICENSE("GPL"); 198