1 /* 2 * ALSA SoC driver for Migo-R 3 * 4 * Copyright (C) 2009-2010 Guennadi Liakhovetski <g.liakhovetski@gmx.de> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 */ 10 11 #include <linux/clkdev.h> 12 #include <linux/device.h> 13 #include <linux/firmware.h> 14 #include <linux/module.h> 15 16 #include <asm/clock.h> 17 18 #include <cpu/sh7722.h> 19 20 #include <sound/core.h> 21 #include <sound/pcm.h> 22 #include <sound/soc.h> 23 24 #include "../codecs/wm8978.h" 25 #include "siu.h" 26 27 /* Default 8000Hz sampling frequency */ 28 static unsigned long codec_freq = 8000 * 512; 29 30 static unsigned int use_count; 31 32 /* External clock, sourced from the codec at the SIUMCKB pin */ 33 static unsigned long siumckb_recalc(struct clk *clk) 34 { 35 return codec_freq; 36 } 37 38 static struct sh_clk_ops siumckb_clk_ops = { 39 .recalc = siumckb_recalc, 40 }; 41 42 static struct clk siumckb_clk = { 43 .ops = &siumckb_clk_ops, 44 .rate = 0, /* initialised at run-time */ 45 }; 46 47 static struct clk_lookup *siumckb_lookup; 48 49 static int migor_hw_params(struct snd_pcm_substream *substream, 50 struct snd_pcm_hw_params *params) 51 { 52 struct snd_soc_pcm_runtime *rtd = substream->private_data; 53 struct snd_soc_dai *codec_dai = rtd->codec_dai; 54 int ret; 55 unsigned int rate = params_rate(params); 56 57 ret = snd_soc_dai_set_sysclk(codec_dai, WM8978_PLL, 13000000, 58 SND_SOC_CLOCK_IN); 59 if (ret < 0) 60 return ret; 61 62 ret = snd_soc_dai_set_clkdiv(codec_dai, WM8978_OPCLKRATE, rate * 512); 63 if (ret < 0) 64 return ret; 65 66 ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_NB_IF | 67 SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBS_CFS); 68 if (ret < 0) 69 return ret; 70 71 ret = snd_soc_dai_set_fmt(rtd->cpu_dai, SND_SOC_DAIFMT_NB_IF | 72 SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBS_CFS); 73 if (ret < 0) 74 return ret; 75 76 codec_freq = rate * 512; 77 /* 78 * This propagates the parent frequency change to children and 79 * recalculates the frequency table 80 */ 81 clk_set_rate(&siumckb_clk, codec_freq); 82 dev_dbg(codec_dai->dev, "%s: configure %luHz\n", __func__, codec_freq); 83 84 ret = snd_soc_dai_set_sysclk(rtd->cpu_dai, SIU_CLKB_EXT, 85 codec_freq / 2, SND_SOC_CLOCK_IN); 86 87 if (!ret) 88 use_count++; 89 90 return ret; 91 } 92 93 static int migor_hw_free(struct snd_pcm_substream *substream) 94 { 95 struct snd_soc_pcm_runtime *rtd = substream->private_data; 96 struct snd_soc_dai *codec_dai = rtd->codec_dai; 97 98 if (use_count) { 99 use_count--; 100 101 if (!use_count) 102 snd_soc_dai_set_sysclk(codec_dai, WM8978_PLL, 0, 103 SND_SOC_CLOCK_IN); 104 } else { 105 dev_dbg(codec_dai->dev, "Unbalanced hw_free!\n"); 106 } 107 108 return 0; 109 } 110 111 static struct snd_soc_ops migor_dai_ops = { 112 .hw_params = migor_hw_params, 113 .hw_free = migor_hw_free, 114 }; 115 116 static const struct snd_soc_dapm_widget migor_dapm_widgets[] = { 117 SND_SOC_DAPM_HP("Headphone", NULL), 118 SND_SOC_DAPM_MIC("Onboard Microphone", NULL), 119 SND_SOC_DAPM_MIC("External Microphone", NULL), 120 }; 121 122 static const struct snd_soc_dapm_route audio_map[] = { 123 /* Headphone output connected to LHP/RHP, enable OUT4 for VMID */ 124 { "Headphone", NULL, "OUT4 VMID" }, 125 { "OUT4 VMID", NULL, "LHP" }, 126 { "OUT4 VMID", NULL, "RHP" }, 127 128 /* On-board microphone */ 129 { "RMICN", NULL, "Mic Bias" }, 130 { "RMICP", NULL, "Mic Bias" }, 131 { "Mic Bias", NULL, "Onboard Microphone" }, 132 133 /* External microphone */ 134 { "LMICN", NULL, "Mic Bias" }, 135 { "LMICP", NULL, "Mic Bias" }, 136 { "Mic Bias", NULL, "External Microphone" }, 137 }; 138 139 static int migor_dai_init(struct snd_soc_pcm_runtime *rtd) 140 { 141 struct snd_soc_codec *codec = rtd->codec; 142 struct snd_soc_dapm_context *dapm = &codec->dapm; 143 144 snd_soc_dapm_new_controls(dapm, migor_dapm_widgets, 145 ARRAY_SIZE(migor_dapm_widgets)); 146 147 snd_soc_dapm_add_routes(dapm, audio_map, ARRAY_SIZE(audio_map)); 148 149 return 0; 150 } 151 152 /* migor digital audio interface glue - connects codec <--> CPU */ 153 static struct snd_soc_dai_link migor_dai = { 154 .name = "wm8978", 155 .stream_name = "WM8978", 156 .cpu_dai_name = "siu-i2s-dai", 157 .codec_dai_name = "wm8978-hifi", 158 .platform_name = "siu-pcm-audio", 159 .codec_name = "wm8978.0-001a", 160 .ops = &migor_dai_ops, 161 .init = migor_dai_init, 162 }; 163 164 /* migor audio machine driver */ 165 static struct snd_soc_card snd_soc_migor = { 166 .name = "Migo-R", 167 .owner = THIS_MODULE, 168 .dai_link = &migor_dai, 169 .num_links = 1, 170 }; 171 172 static struct platform_device *migor_snd_device; 173 174 static int __init migor_init(void) 175 { 176 int ret; 177 178 ret = clk_register(&siumckb_clk); 179 if (ret < 0) 180 return ret; 181 182 siumckb_lookup = clkdev_alloc(&siumckb_clk, "siumckb_clk", NULL); 183 if (!siumckb_lookup) { 184 ret = -ENOMEM; 185 goto eclkdevalloc; 186 } 187 clkdev_add(siumckb_lookup); 188 189 /* Port number used on this machine: port B */ 190 migor_snd_device = platform_device_alloc("soc-audio", 1); 191 if (!migor_snd_device) { 192 ret = -ENOMEM; 193 goto epdevalloc; 194 } 195 196 platform_set_drvdata(migor_snd_device, &snd_soc_migor); 197 198 ret = platform_device_add(migor_snd_device); 199 if (ret) 200 goto epdevadd; 201 202 return 0; 203 204 epdevadd: 205 platform_device_put(migor_snd_device); 206 epdevalloc: 207 clkdev_drop(siumckb_lookup); 208 eclkdevalloc: 209 clk_unregister(&siumckb_clk); 210 return ret; 211 } 212 213 static void __exit migor_exit(void) 214 { 215 clkdev_drop(siumckb_lookup); 216 clk_unregister(&siumckb_clk); 217 platform_device_unregister(migor_snd_device); 218 } 219 220 module_init(migor_init); 221 module_exit(migor_exit); 222 223 MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>"); 224 MODULE_DESCRIPTION("ALSA SoC Migor"); 225 MODULE_LICENSE("GPL v2"); 226