1 | // SPDX-License-Identifier: GPL-2.0 |
2 | // |
3 | // ALSA SoC driver for Migo-R |
4 | // |
5 | // Copyright (C) 2009-2010 Guennadi Liakhovetski <g.liakhovetski@gmx.de> |
6 | |
7 | #include <linux/clkdev.h> |
8 | #include <linux/device.h> |
9 | #include <linux/firmware.h> |
10 | #include <linux/module.h> |
11 | |
12 | #include <asm/clock.h> |
13 | |
14 | #include <cpu/sh7722.h> |
15 | |
16 | #include <sound/core.h> |
17 | #include <sound/pcm.h> |
18 | #include <sound/soc.h> |
19 | |
20 | #include "../codecs/wm8978.h" |
21 | #include "siu.h" |
22 | |
23 | /* Default 8000Hz sampling frequency */ |
24 | static unsigned long codec_freq = 8000 * 512; |
25 | |
26 | static unsigned int use_count; |
27 | |
28 | /* External clock, sourced from the codec at the SIUMCKB pin */ |
29 | static unsigned long siumckb_recalc(struct clk *clk) |
30 | { |
31 | return codec_freq; |
32 | } |
33 | |
34 | static struct sh_clk_ops siumckb_clk_ops = { |
35 | .recalc = siumckb_recalc, |
36 | }; |
37 | |
38 | static struct clk siumckb_clk = { |
39 | .ops = &siumckb_clk_ops, |
40 | .rate = 0, /* initialised at run-time */ |
41 | }; |
42 | |
43 | static struct clk_lookup *siumckb_lookup; |
44 | |
45 | static int migor_hw_params(struct snd_pcm_substream *substream, |
46 | struct snd_pcm_hw_params *params) |
47 | { |
48 | struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream); |
49 | struct snd_soc_dai *codec_dai = snd_soc_rtd_to_codec(rtd, 0); |
50 | int ret; |
51 | unsigned int rate = params_rate(p: params); |
52 | |
53 | ret = snd_soc_dai_set_sysclk(dai: codec_dai, clk_id: WM8978_PLL, freq: 13000000, |
54 | SND_SOC_CLOCK_IN); |
55 | if (ret < 0) |
56 | return ret; |
57 | |
58 | ret = snd_soc_dai_set_clkdiv(dai: codec_dai, div_id: WM8978_OPCLKRATE, div: rate * 512); |
59 | if (ret < 0) |
60 | return ret; |
61 | |
62 | codec_freq = rate * 512; |
63 | /* |
64 | * This propagates the parent frequency change to children and |
65 | * recalculates the frequency table |
66 | */ |
67 | clk_set_rate(&siumckb_clk, codec_freq); |
68 | dev_dbg(codec_dai->dev, "%s: configure %luHz\n" , __func__, codec_freq); |
69 | |
70 | ret = snd_soc_dai_set_sysclk(snd_soc_rtd_to_cpu(rtd, 0), clk_id: SIU_CLKB_EXT, |
71 | freq: codec_freq / 2, SND_SOC_CLOCK_IN); |
72 | |
73 | if (!ret) |
74 | use_count++; |
75 | |
76 | return ret; |
77 | } |
78 | |
79 | static int migor_hw_free(struct snd_pcm_substream *substream) |
80 | { |
81 | struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream); |
82 | struct snd_soc_dai *codec_dai = snd_soc_rtd_to_codec(rtd, 0); |
83 | |
84 | if (use_count) { |
85 | use_count--; |
86 | |
87 | if (!use_count) |
88 | snd_soc_dai_set_sysclk(dai: codec_dai, clk_id: WM8978_PLL, freq: 0, |
89 | SND_SOC_CLOCK_IN); |
90 | } else { |
91 | dev_dbg(codec_dai->dev, "Unbalanced hw_free!\n" ); |
92 | } |
93 | |
94 | return 0; |
95 | } |
96 | |
97 | static const struct snd_soc_ops migor_dai_ops = { |
98 | .hw_params = migor_hw_params, |
99 | .hw_free = migor_hw_free, |
100 | }; |
101 | |
102 | static const struct snd_soc_dapm_widget migor_dapm_widgets[] = { |
103 | SND_SOC_DAPM_HP("Headphone" , NULL), |
104 | SND_SOC_DAPM_MIC("Onboard Microphone" , NULL), |
105 | SND_SOC_DAPM_MIC("External Microphone" , NULL), |
106 | }; |
107 | |
108 | static const struct snd_soc_dapm_route audio_map[] = { |
109 | /* Headphone output connected to LHP/RHP, enable OUT4 for VMID */ |
110 | { "Headphone" , NULL, "OUT4 VMID" }, |
111 | { "OUT4 VMID" , NULL, "LHP" }, |
112 | { "OUT4 VMID" , NULL, "RHP" }, |
113 | |
114 | /* On-board microphone */ |
115 | { "RMICN" , NULL, "Mic Bias" }, |
116 | { "RMICP" , NULL, "Mic Bias" }, |
117 | { "Mic Bias" , NULL, "Onboard Microphone" }, |
118 | |
119 | /* External microphone */ |
120 | { "LMICN" , NULL, "Mic Bias" }, |
121 | { "LMICP" , NULL, "Mic Bias" }, |
122 | { "Mic Bias" , NULL, "External Microphone" }, |
123 | }; |
124 | |
125 | /* migor digital audio interface glue - connects codec <--> CPU */ |
126 | SND_SOC_DAILINK_DEFS(wm8978, |
127 | DAILINK_COMP_ARRAY(COMP_CPU("siu-pcm-audio" )), |
128 | DAILINK_COMP_ARRAY(COMP_CODEC("wm8978.0-001a" , "wm8978-hifi" )), |
129 | DAILINK_COMP_ARRAY(COMP_PLATFORM("siu-pcm-audio" ))); |
130 | |
131 | static struct snd_soc_dai_link migor_dai = { |
132 | .name = "wm8978" , |
133 | .stream_name = "WM8978" , |
134 | .dai_fmt = SND_SOC_DAIFMT_NB_IF | SND_SOC_DAIFMT_I2S | |
135 | SND_SOC_DAIFMT_CBS_CFS, |
136 | .ops = &migor_dai_ops, |
137 | SND_SOC_DAILINK_REG(wm8978), |
138 | }; |
139 | |
140 | /* migor audio machine driver */ |
141 | static struct snd_soc_card snd_soc_migor = { |
142 | .name = "Migo-R" , |
143 | .owner = THIS_MODULE, |
144 | .dai_link = &migor_dai, |
145 | .num_links = 1, |
146 | |
147 | .dapm_widgets = migor_dapm_widgets, |
148 | .num_dapm_widgets = ARRAY_SIZE(migor_dapm_widgets), |
149 | .dapm_routes = audio_map, |
150 | .num_dapm_routes = ARRAY_SIZE(audio_map), |
151 | }; |
152 | |
153 | static struct platform_device *migor_snd_device; |
154 | |
155 | static int __init migor_init(void) |
156 | { |
157 | int ret; |
158 | |
159 | ret = clk_register(&siumckb_clk); |
160 | if (ret < 0) |
161 | return ret; |
162 | |
163 | siumckb_lookup = clkdev_create(clk: &siumckb_clk, con_id: "siumckb_clk" , NULL); |
164 | if (!siumckb_lookup) { |
165 | ret = -ENOMEM; |
166 | goto eclkdevalloc; |
167 | } |
168 | |
169 | /* Port number used on this machine: port B */ |
170 | migor_snd_device = platform_device_alloc(name: "soc-audio" , id: 1); |
171 | if (!migor_snd_device) { |
172 | ret = -ENOMEM; |
173 | goto epdevalloc; |
174 | } |
175 | |
176 | platform_set_drvdata(pdev: migor_snd_device, data: &snd_soc_migor); |
177 | |
178 | ret = platform_device_add(pdev: migor_snd_device); |
179 | if (ret) |
180 | goto epdevadd; |
181 | |
182 | return 0; |
183 | |
184 | epdevadd: |
185 | platform_device_put(pdev: migor_snd_device); |
186 | epdevalloc: |
187 | clkdev_drop(cl: siumckb_lookup); |
188 | eclkdevalloc: |
189 | clk_unregister(&siumckb_clk); |
190 | return ret; |
191 | } |
192 | |
193 | static void __exit migor_exit(void) |
194 | { |
195 | clkdev_drop(cl: siumckb_lookup); |
196 | clk_unregister(&siumckb_clk); |
197 | platform_device_unregister(migor_snd_device); |
198 | } |
199 | |
200 | module_init(migor_init); |
201 | module_exit(migor_exit); |
202 | |
203 | MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>" ); |
204 | MODULE_DESCRIPTION("ALSA SoC Migor" ); |
205 | MODULE_LICENSE("GPL v2" ); |
206 | |