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 */ 29static unsigned long codec_freq = 8000 * 512; 30 31static unsigned int use_count; 32 33/* External clock, sourced from the codec at the SIUMCKB pin */ 34static unsigned long siumckb_recalc(struct clk *clk) 35{ 36 return codec_freq; 37} 38 39static struct clk_ops siumckb_clk_ops = { 40 .recalc = siumckb_recalc, 41}; 42 43static struct clk siumckb_clk = { 44 .ops = &siumckb_clk_ops, 45 .rate = 0, /* initialised at run-time */ 46}; 47 48static struct clk_lookup *siumckb_lookup; 49 50static 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->dai->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->dai->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->dai->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 94static 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->dai->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 112static struct snd_soc_ops migor_dai_ops = { 113 .hw_params = migor_hw_params, 114 .hw_free = migor_hw_free, 115}; 116 117static 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 123static 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 140static int migor_dai_init(struct snd_soc_codec *codec) 141{ 142 snd_soc_dapm_new_controls(codec, migor_dapm_widgets, 143 ARRAY_SIZE(migor_dapm_widgets)); 144 145 snd_soc_dapm_add_routes(codec, audio_map, ARRAY_SIZE(audio_map)); 146 147 return 0; 148} 149 150/* migor digital audio interface glue - connects codec <--> CPU */ 151static struct snd_soc_dai_link migor_dai = { 152 .name = "wm8978", 153 .stream_name = "WM8978", 154 .cpu_dai = &siu_i2s_dai, 155 .codec_dai = &wm8978_dai, 156 .ops = &migor_dai_ops, 157 .init = migor_dai_init, 158}; 159 160/* migor audio machine driver */ 161static struct snd_soc_card snd_soc_migor = { 162 .name = "Migo-R", 163 .platform = &siu_platform, 164 .dai_link = &migor_dai, 165 .num_links = 1, 166}; 167 168/* migor audio subsystem */ 169static struct snd_soc_device migor_snd_devdata = { 170 .card = &snd_soc_migor, 171 .codec_dev = &soc_codec_dev_wm8978, 172}; 173 174static struct platform_device *migor_snd_device; 175 176static int __init migor_init(void) 177{ 178 int ret; 179 180 ret = clk_register(&siumckb_clk); 181 if (ret < 0) 182 return ret; 183 184 siumckb_lookup = clkdev_alloc(&siumckb_clk, "siumckb_clk", NULL); 185 if (!siumckb_lookup) { 186 ret = -ENOMEM; 187 goto eclkdevalloc; 188 } 189 clkdev_add(siumckb_lookup); 190 191 /* Port number used on this machine: port B */ 192 migor_snd_device = platform_device_alloc("soc-audio", 1); 193 if (!migor_snd_device) { 194 ret = -ENOMEM; 195 goto epdevalloc; 196 } 197 198 platform_set_drvdata(migor_snd_device, &migor_snd_devdata); 199 200 migor_snd_devdata.dev = &migor_snd_device->dev; 201 202 ret = platform_device_add(migor_snd_device); 203 if (ret) 204 goto epdevadd; 205 206 return 0; 207 208epdevadd: 209 platform_device_put(migor_snd_device); 210epdevalloc: 211 clkdev_drop(siumckb_lookup); 212eclkdevalloc: 213 clk_unregister(&siumckb_clk); 214 return ret; 215} 216 217static void __exit migor_exit(void) 218{ 219 clkdev_drop(siumckb_lookup); 220 clk_unregister(&siumckb_clk); 221 platform_device_unregister(migor_snd_device); 222} 223 224module_init(migor_init); 225module_exit(migor_exit); 226 227MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>"); 228MODULE_DESCRIPTION("ALSA SoC Migor"); 229MODULE_LICENSE("GPL v2"); 230