This source file includes following definitions.
- wm8524_startup
- wm8524_shutdown
- wm8524_set_dai_sysclk
- wm8524_set_fmt
- wm8524_mute_stream
- wm8524_probe
- wm8524_codec_probe
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11 #include <linux/module.h>
12 #include <linux/moduleparam.h>
13 #include <linux/init.h>
14 #include <linux/delay.h>
15 #include <linux/slab.h>
16 #include <linux/gpio/consumer.h>
17 #include <linux/of_device.h>
18 #include <sound/core.h>
19 #include <sound/pcm.h>
20 #include <sound/pcm_params.h>
21 #include <sound/soc.h>
22 #include <sound/initval.h>
23
24 #define WM8524_NUM_RATES 7
25
26
27 struct wm8524_priv {
28 struct gpio_desc *mute;
29 unsigned int sysclk;
30 unsigned int rate_constraint_list[WM8524_NUM_RATES];
31 struct snd_pcm_hw_constraint_list rate_constraint;
32 };
33
34
35 static const struct snd_soc_dapm_widget wm8524_dapm_widgets[] = {
36 SND_SOC_DAPM_DAC("DAC", "Playback", SND_SOC_NOPM, 0, 0),
37 SND_SOC_DAPM_OUTPUT("LINEVOUTL"),
38 SND_SOC_DAPM_OUTPUT("LINEVOUTR"),
39 };
40
41 static const struct snd_soc_dapm_route wm8524_dapm_routes[] = {
42 { "LINEVOUTL", NULL, "DAC" },
43 { "LINEVOUTR", NULL, "DAC" },
44 };
45
46 static const struct {
47 int value;
48 int ratio;
49 } lrclk_ratios[WM8524_NUM_RATES] = {
50 { 1, 128 },
51 { 2, 192 },
52 { 3, 256 },
53 { 4, 384 },
54 { 5, 512 },
55 { 6, 768 },
56 { 7, 1152 },
57 };
58
59 static int wm8524_startup(struct snd_pcm_substream *substream,
60 struct snd_soc_dai *dai)
61 {
62 struct snd_soc_component *component = dai->component;
63 struct wm8524_priv *wm8524 = snd_soc_component_get_drvdata(component);
64
65
66
67
68 if (!wm8524->sysclk) {
69 dev_err(component->dev,
70 "No MCLK configured, call set_sysclk() on init\n");
71 return -EINVAL;
72 }
73
74 snd_pcm_hw_constraint_list(substream->runtime, 0,
75 SNDRV_PCM_HW_PARAM_RATE,
76 &wm8524->rate_constraint);
77
78 gpiod_set_value_cansleep(wm8524->mute, 1);
79
80 return 0;
81 }
82
83 static void wm8524_shutdown(struct snd_pcm_substream *substream,
84 struct snd_soc_dai *dai)
85 {
86 struct snd_soc_component *component = dai->component;
87 struct wm8524_priv *wm8524 = snd_soc_component_get_drvdata(component);
88
89 gpiod_set_value_cansleep(wm8524->mute, 0);
90 }
91
92 static int wm8524_set_dai_sysclk(struct snd_soc_dai *codec_dai,
93 int clk_id, unsigned int freq, int dir)
94 {
95 struct snd_soc_component *component = codec_dai->component;
96 struct wm8524_priv *wm8524 = snd_soc_component_get_drvdata(component);
97 unsigned int val;
98 int i, j = 0;
99
100 wm8524->sysclk = freq;
101
102 wm8524->rate_constraint.count = 0;
103 for (i = 0; i < ARRAY_SIZE(lrclk_ratios); i++) {
104 val = freq / lrclk_ratios[i].ratio;
105
106
107
108
109 switch (val) {
110 case 8000:
111 case 32000:
112 case 44100:
113 case 48000:
114 case 88200:
115 case 96000:
116 case 176400:
117 case 192000:
118 dev_dbg(component->dev, "Supported sample rate: %dHz\n",
119 val);
120 wm8524->rate_constraint_list[j++] = val;
121 wm8524->rate_constraint.count++;
122 break;
123 default:
124 dev_dbg(component->dev, "Skipping sample rate: %dHz\n",
125 val);
126 }
127 }
128
129
130 if (wm8524->rate_constraint.count == 0)
131 return -EINVAL;
132
133 return 0;
134 }
135
136 static int wm8524_set_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt)
137 {
138 fmt &= (SND_SOC_DAIFMT_FORMAT_MASK | SND_SOC_DAIFMT_INV_MASK |
139 SND_SOC_DAIFMT_MASTER_MASK);
140
141 if (fmt != (SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
142 SND_SOC_DAIFMT_CBS_CFS)) {
143 dev_err(codec_dai->dev, "Invalid DAI format\n");
144 return -EINVAL;
145 }
146
147 return 0;
148 }
149
150 static int wm8524_mute_stream(struct snd_soc_dai *dai, int mute, int stream)
151 {
152 struct wm8524_priv *wm8524 = snd_soc_component_get_drvdata(dai->component);
153
154 if (wm8524->mute)
155 gpiod_set_value_cansleep(wm8524->mute, mute);
156
157 return 0;
158 }
159
160 #define WM8524_RATES SNDRV_PCM_RATE_8000_192000
161
162 #define WM8524_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE)
163
164 static const struct snd_soc_dai_ops wm8524_dai_ops = {
165 .startup = wm8524_startup,
166 .shutdown = wm8524_shutdown,
167 .set_sysclk = wm8524_set_dai_sysclk,
168 .set_fmt = wm8524_set_fmt,
169 .mute_stream = wm8524_mute_stream,
170 };
171
172 static struct snd_soc_dai_driver wm8524_dai = {
173 .name = "wm8524-hifi",
174 .playback = {
175 .stream_name = "Playback",
176 .channels_min = 2,
177 .channels_max = 2,
178 .rates = WM8524_RATES,
179 .formats = WM8524_FORMATS,
180 },
181 .ops = &wm8524_dai_ops,
182 };
183
184 static int wm8524_probe(struct snd_soc_component *component)
185 {
186 struct wm8524_priv *wm8524 = snd_soc_component_get_drvdata(component);
187
188 wm8524->rate_constraint.list = &wm8524->rate_constraint_list[0];
189 wm8524->rate_constraint.count =
190 ARRAY_SIZE(wm8524->rate_constraint_list);
191
192 return 0;
193 }
194
195 static const struct snd_soc_component_driver soc_component_dev_wm8524 = {
196 .probe = wm8524_probe,
197 .dapm_widgets = wm8524_dapm_widgets,
198 .num_dapm_widgets = ARRAY_SIZE(wm8524_dapm_widgets),
199 .dapm_routes = wm8524_dapm_routes,
200 .num_dapm_routes = ARRAY_SIZE(wm8524_dapm_routes),
201 .idle_bias_on = 1,
202 .use_pmdown_time = 1,
203 .endianness = 1,
204 .non_legacy_dai_naming = 1,
205 };
206
207 static const struct of_device_id wm8524_of_match[] = {
208 { .compatible = "wlf,wm8524" },
209 { }
210 };
211 MODULE_DEVICE_TABLE(of, wm8524_of_match);
212
213 static int wm8524_codec_probe(struct platform_device *pdev)
214 {
215 struct wm8524_priv *wm8524;
216 int ret;
217
218 wm8524 = devm_kzalloc(&pdev->dev, sizeof(struct wm8524_priv),
219 GFP_KERNEL);
220 if (wm8524 == NULL)
221 return -ENOMEM;
222
223 platform_set_drvdata(pdev, wm8524);
224
225 wm8524->mute = devm_gpiod_get(&pdev->dev, "wlf,mute", GPIOD_OUT_LOW);
226 if (IS_ERR(wm8524->mute)) {
227 ret = PTR_ERR(wm8524->mute);
228 dev_err(&pdev->dev, "Failed to get mute line: %d\n", ret);
229 return ret;
230 }
231
232 ret = devm_snd_soc_register_component(&pdev->dev,
233 &soc_component_dev_wm8524, &wm8524_dai, 1);
234 if (ret < 0)
235 dev_err(&pdev->dev, "Failed to register component: %d\n", ret);
236
237 return ret;
238 }
239
240 static struct platform_driver wm8524_codec_driver = {
241 .probe = wm8524_codec_probe,
242 .driver = {
243 .name = "wm8524-codec",
244 .of_match_table = wm8524_of_match,
245 },
246 };
247 module_platform_driver(wm8524_codec_driver);
248
249 MODULE_DESCRIPTION("ASoC WM8524 driver");
250 MODULE_AUTHOR("Mihai Serban <mihai.serban@nxp.com>");
251 MODULE_ALIAS("platform:wm8524-codec");
252 MODULE_LICENSE("GPL");