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