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