1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * wm8524.c -- WM8524 ALSA SoC Audio driver |
4 | * |
5 | * Copyright 2009 Wolfson Microelectronics plc |
6 | * Copyright 2017 NXP |
7 | * |
8 | * Based on WM8523 ALSA SoC Audio driver written by Mark Brown |
9 | */ |
10 | |
11 | #include <linux/mod_devicetable.h> |
12 | #include <linux/module.h> |
13 | #include <linux/moduleparam.h> |
14 | #include <linux/init.h> |
15 | #include <linux/delay.h> |
16 | #include <linux/slab.h> |
17 | #include <linux/gpio/consumer.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 | /* codec private data */ |
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(c: component); |
64 | |
65 | /* The set of sample rates that can be supported depends on the |
66 | * MCLK supplied to the CODEC - enforce this. |
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(runtime: substream->runtime, cond: 0, |
75 | SNDRV_PCM_HW_PARAM_RATE, |
76 | l: &wm8524->rate_constraint); |
77 | |
78 | gpiod_set_value_cansleep(desc: wm8524->mute, value: 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(c: component); |
88 | |
89 | gpiod_set_value_cansleep(desc: wm8524->mute, value: 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(c: 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 | /* Check that it's a standard rate since core can't |
106 | * cope with others and having the odd rates confuses |
107 | * constraint matching. |
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 | /* Need at least one supported rate... */ |
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(c: dai->component); |
153 | |
154 | if (wm8524->mute) |
155 | gpiod_set_value_cansleep(desc: wm8524->mute, value: 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 |\ |
163 | SNDRV_PCM_FMTBIT_S24_LE |\ |
164 | SNDRV_PCM_FMTBIT_S32_LE) |
165 | |
166 | static const struct snd_soc_dai_ops wm8524_dai_ops = { |
167 | .startup = wm8524_startup, |
168 | .shutdown = wm8524_shutdown, |
169 | .set_sysclk = wm8524_set_dai_sysclk, |
170 | .set_fmt = wm8524_set_fmt, |
171 | .mute_stream = wm8524_mute_stream, |
172 | }; |
173 | |
174 | static struct snd_soc_dai_driver wm8524_dai = { |
175 | .name = "wm8524-hifi" , |
176 | .playback = { |
177 | .stream_name = "Playback" , |
178 | .channels_min = 2, |
179 | .channels_max = 2, |
180 | .rates = WM8524_RATES, |
181 | .formats = WM8524_FORMATS, |
182 | }, |
183 | .ops = &wm8524_dai_ops, |
184 | }; |
185 | |
186 | static int wm8524_probe(struct snd_soc_component *component) |
187 | { |
188 | struct wm8524_priv *wm8524 = snd_soc_component_get_drvdata(c: component); |
189 | |
190 | wm8524->rate_constraint.list = &wm8524->rate_constraint_list[0]; |
191 | wm8524->rate_constraint.count = |
192 | ARRAY_SIZE(wm8524->rate_constraint_list); |
193 | |
194 | return 0; |
195 | } |
196 | |
197 | static const struct snd_soc_component_driver soc_component_dev_wm8524 = { |
198 | .probe = wm8524_probe, |
199 | .dapm_widgets = wm8524_dapm_widgets, |
200 | .num_dapm_widgets = ARRAY_SIZE(wm8524_dapm_widgets), |
201 | .dapm_routes = wm8524_dapm_routes, |
202 | .num_dapm_routes = ARRAY_SIZE(wm8524_dapm_routes), |
203 | .idle_bias_on = 1, |
204 | .use_pmdown_time = 1, |
205 | .endianness = 1, |
206 | }; |
207 | |
208 | static const struct of_device_id wm8524_of_match[] = { |
209 | { .compatible = "wlf,wm8524" }, |
210 | { /* sentinel*/ } |
211 | }; |
212 | MODULE_DEVICE_TABLE(of, wm8524_of_match); |
213 | |
214 | static int wm8524_codec_probe(struct platform_device *pdev) |
215 | { |
216 | struct wm8524_priv *wm8524; |
217 | int ret; |
218 | |
219 | wm8524 = devm_kzalloc(dev: &pdev->dev, size: sizeof(struct wm8524_priv), |
220 | GFP_KERNEL); |
221 | if (wm8524 == NULL) |
222 | return -ENOMEM; |
223 | |
224 | platform_set_drvdata(pdev, data: wm8524); |
225 | |
226 | wm8524->mute = devm_gpiod_get(dev: &pdev->dev, con_id: "wlf,mute" , flags: GPIOD_OUT_LOW); |
227 | if (IS_ERR(ptr: wm8524->mute)) { |
228 | ret = PTR_ERR(ptr: wm8524->mute); |
229 | dev_err_probe(dev: &pdev->dev, err: ret, fmt: "Failed to get mute line\n" ); |
230 | return ret; |
231 | } |
232 | |
233 | ret = devm_snd_soc_register_component(dev: &pdev->dev, |
234 | component_driver: &soc_component_dev_wm8524, dai_drv: &wm8524_dai, num_dai: 1); |
235 | if (ret < 0) |
236 | dev_err(&pdev->dev, "Failed to register component: %d\n" , ret); |
237 | |
238 | return ret; |
239 | } |
240 | |
241 | static struct platform_driver wm8524_codec_driver = { |
242 | .probe = wm8524_codec_probe, |
243 | .driver = { |
244 | .name = "wm8524-codec" , |
245 | .of_match_table = wm8524_of_match, |
246 | }, |
247 | }; |
248 | module_platform_driver(wm8524_codec_driver); |
249 | |
250 | MODULE_DESCRIPTION("ASoC WM8524 driver" ); |
251 | MODULE_AUTHOR("Mihai Serban <mihai.serban@nxp.com>" ); |
252 | MODULE_ALIAS("platform:wm8524-codec" ); |
253 | MODULE_LICENSE("GPL" ); |
254 | |