1 /*
2 * wm8524.c -- WM8524 ALSA SoC Audio driver
3 *
4 * Copyright 2009 Wolfson Microelectronics plc
5 * Copyright 2017 NXP
6 *
7 * Based on WM8523 ALSA SoC Audio driver written by Mark Brown
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14 #include <linux/module.h>
15 #include <linux/moduleparam.h>
16 #include <linux/init.h>
17 #include <linux/delay.h>
18 #include <linux/slab.h>
19 #include <linux/gpio/consumer.h>
20 #include <linux/of_device.h>
21 #include <sound/core.h>
22 #include <sound/pcm.h>
23 #include <sound/pcm_params.h>
24 #include <sound/soc.h>
25 #include <sound/initval.h>
26
27 #define WM8524_NUM_RATES 7
28
29 /* codec private data */
30 struct wm8524_priv {
31 struct gpio_desc *mute;
32 unsigned int sysclk;
33 unsigned int rate_constraint_list[WM8524_NUM_RATES];
34 struct snd_pcm_hw_constraint_list rate_constraint;
35 };
36
37
38 static const struct snd_soc_dapm_widget wm8524_dapm_widgets[] = {
39 SND_SOC_DAPM_DAC("DAC", "Playback", SND_SOC_NOPM, 0, 0),
40 SND_SOC_DAPM_OUTPUT("LINEVOUTL"),
41 SND_SOC_DAPM_OUTPUT("LINEVOUTR"),
42 };
43
44 static const struct snd_soc_dapm_route wm8524_dapm_routes[] = {
45 { "LINEVOUTL", NULL, "DAC" },
46 { "LINEVOUTR", NULL, "DAC" },
47 };
48
49 static const struct {
50 int value;
51 int ratio;
52 } lrclk_ratios[WM8524_NUM_RATES] = {
53 { 1, 128 },
54 { 2, 192 },
55 { 3, 256 },
56 { 4, 384 },
57 { 5, 512 },
58 { 6, 768 },
59 { 7, 1152 },
60 };
61
wm8524_startup(struct snd_pcm_substream * substream,struct snd_soc_dai * dai)62 static int wm8524_startup(struct snd_pcm_substream *substream,
63 struct snd_soc_dai *dai)
64 {
65 struct snd_soc_codec *codec = dai->codec;
66 struct wm8524_priv *wm8524 = snd_soc_codec_get_drvdata(codec);
67
68 /* The set of sample rates that can be supported depends on the
69 * MCLK supplied to the CODEC - enforce this.
70 */
71 if (!wm8524->sysclk) {
72 dev_err(codec->dev,
73 "No MCLK configured, call set_sysclk() on init\n");
74 return -EINVAL;
75 }
76
77 snd_pcm_hw_constraint_list(substream->runtime, 0,
78 SNDRV_PCM_HW_PARAM_RATE,
79 &wm8524->rate_constraint);
80
81 gpiod_set_value_cansleep(wm8524->mute, 1);
82
83 return 0;
84 }
85
wm8524_shutdown(struct snd_pcm_substream * substream,struct snd_soc_dai * dai)86 static void wm8524_shutdown(struct snd_pcm_substream *substream,
87 struct snd_soc_dai *dai)
88 {
89 struct snd_soc_codec *codec = dai->codec;
90 struct wm8524_priv *wm8524 = snd_soc_codec_get_drvdata(codec);
91
92 gpiod_set_value_cansleep(wm8524->mute, 0);
93 }
94
wm8524_set_dai_sysclk(struct snd_soc_dai * codec_dai,int clk_id,unsigned int freq,int dir)95 static int wm8524_set_dai_sysclk(struct snd_soc_dai *codec_dai,
96 int clk_id, unsigned int freq, int dir)
97 {
98 struct snd_soc_codec *codec = codec_dai->codec;
99 struct wm8524_priv *wm8524 = snd_soc_codec_get_drvdata(codec);
100 unsigned int val;
101 int i, j = 0;
102
103 wm8524->sysclk = freq;
104
105 wm8524->rate_constraint.count = 0;
106 for (i = 0; i < ARRAY_SIZE(lrclk_ratios); i++) {
107 val = freq / lrclk_ratios[i].ratio;
108 /* Check that it's a standard rate since core can't
109 * cope with others and having the odd rates confuses
110 * constraint matching.
111 */
112 switch (val) {
113 case 8000:
114 case 32000:
115 case 44100:
116 case 48000:
117 case 88200:
118 case 96000:
119 case 176400:
120 case 192000:
121 dev_dbg(codec->dev, "Supported sample rate: %dHz\n",
122 val);
123 wm8524->rate_constraint_list[j++] = val;
124 wm8524->rate_constraint.count++;
125 break;
126 default:
127 dev_dbg(codec->dev, "Skipping sample rate: %dHz\n",
128 val);
129 }
130 }
131
132 /* Need at least one supported rate... */
133 if (wm8524->rate_constraint.count == 0)
134 return -EINVAL;
135
136 return 0;
137 }
138
wm8524_set_fmt(struct snd_soc_dai * codec_dai,unsigned int fmt)139 static int wm8524_set_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt)
140 {
141 fmt &= (SND_SOC_DAIFMT_FORMAT_MASK | SND_SOC_DAIFMT_INV_MASK |
142 SND_SOC_DAIFMT_MASTER_MASK);
143
144 if (fmt != (SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
145 SND_SOC_DAIFMT_CBS_CFS)) {
146 dev_err(codec_dai->dev, "Invalid DAI format\n");
147 return -EINVAL;
148 }
149
150 return 0;
151 }
152
wm8524_mute_stream(struct snd_soc_dai * dai,int mute,int stream)153 static int wm8524_mute_stream(struct snd_soc_dai *dai, int mute, int stream)
154 {
155 struct wm8524_priv *wm8524 = snd_soc_codec_get_drvdata(dai->codec);
156
157 if (wm8524->mute)
158 gpiod_set_value_cansleep(wm8524->mute, mute);
159
160 return 0;
161 }
162
163 #define WM8524_RATES SNDRV_PCM_RATE_8000_192000
164
165 #define WM8524_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE)
166
167 static const struct snd_soc_dai_ops wm8524_dai_ops = {
168 .startup = wm8524_startup,
169 .shutdown = wm8524_shutdown,
170 .set_sysclk = wm8524_set_dai_sysclk,
171 .set_fmt = wm8524_set_fmt,
172 .mute_stream = wm8524_mute_stream,
173 };
174
175 static struct snd_soc_dai_driver wm8524_dai = {
176 .name = "wm8524-hifi",
177 .playback = {
178 .stream_name = "Playback",
179 .channels_min = 2,
180 .channels_max = 2,
181 .rates = WM8524_RATES,
182 .formats = WM8524_FORMATS,
183 },
184 .ops = &wm8524_dai_ops,
185 };
186
wm8524_probe(struct snd_soc_codec * codec)187 static int wm8524_probe(struct snd_soc_codec *codec)
188 {
189 struct wm8524_priv *wm8524 = snd_soc_codec_get_drvdata(codec);
190
191 wm8524->rate_constraint.list = &wm8524->rate_constraint_list[0];
192 wm8524->rate_constraint.count =
193 ARRAY_SIZE(wm8524->rate_constraint_list);
194
195 return 0;
196 }
197
198 static const struct snd_soc_codec_driver soc_codec_dev_wm8524 = {
199 .probe = wm8524_probe,
200
201 .component_driver = {
202 .dapm_widgets = wm8524_dapm_widgets,
203 .num_dapm_widgets = ARRAY_SIZE(wm8524_dapm_widgets),
204 .dapm_routes = wm8524_dapm_routes,
205 .num_dapm_routes = ARRAY_SIZE(wm8524_dapm_routes),
206 },
207 };
208
209 static const struct of_device_id wm8524_of_match[] = {
210 { .compatible = "wlf,wm8524" },
211 { /* sentinel*/ }
212 };
213 MODULE_DEVICE_TABLE(of, wm8524_of_match);
214
wm8524_codec_probe(struct platform_device * pdev)215 static int wm8524_codec_probe(struct platform_device *pdev)
216 {
217 struct wm8524_priv *wm8524;
218 int ret;
219
220 wm8524 = devm_kzalloc(&pdev->dev, sizeof(struct wm8524_priv),
221 GFP_KERNEL);
222 if (wm8524 == NULL)
223 return -ENOMEM;
224
225 platform_set_drvdata(pdev, wm8524);
226
227 wm8524->mute = devm_gpiod_get(&pdev->dev, "wlf,mute", GPIOD_OUT_LOW);
228 if (IS_ERR(wm8524->mute)) {
229 ret = PTR_ERR(wm8524->mute);
230 dev_err(&pdev->dev, "Failed to get mute line: %d\n", ret);
231 return ret;
232 }
233
234 ret = snd_soc_register_codec(&pdev->dev,
235 &soc_codec_dev_wm8524, &wm8524_dai, 1);
236 if (ret < 0)
237 dev_err(&pdev->dev, "Failed to register codec: %d\n", ret);
238
239 return ret;
240 }
241
wm8524_codec_remove(struct platform_device * pdev)242 static int wm8524_codec_remove(struct platform_device *pdev)
243 {
244 snd_soc_unregister_codec(&pdev->dev);
245 return 0;
246 }
247
248 static struct platform_driver wm8524_codec_driver = {
249 .probe = wm8524_codec_probe,
250 .remove = wm8524_codec_remove,
251 .driver = {
252 .name = "wm8524-codec",
253 .of_match_table = wm8524_of_match,
254 },
255 };
256 module_platform_driver(wm8524_codec_driver);
257
258 MODULE_DESCRIPTION("ASoC WM8524 driver");
259 MODULE_AUTHOR("Mihai Serban <mihai.serban@nxp.com>");
260 MODULE_ALIAS("platform:wm8524-codec");
261 MODULE_LICENSE("GPL");
262