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 /* migor digital audio interface glue - connects codec <--> CPU */ 140 static struct snd_soc_dai_link migor_dai = { 141 .name = "wm8978", 142 .stream_name = "WM8978", 143 .cpu_dai_name = "siu-pcm-audio", 144 .codec_dai_name = "wm8978-hifi", 145 .platform_name = "siu-pcm-audio", 146 .codec_name = "wm8978.0-001a", 147 .ops = &migor_dai_ops, 148 }; 149 150 /* migor audio machine driver */ 151 static struct snd_soc_card snd_soc_migor = { 152 .name = "Migo-R", 153 .owner = THIS_MODULE, 154 .dai_link = &migor_dai, 155 .num_links = 1, 156 157 .dapm_widgets = migor_dapm_widgets, 158 .num_dapm_widgets = ARRAY_SIZE(migor_dapm_widgets), 159 .dapm_routes = audio_map, 160 .num_dapm_routes = ARRAY_SIZE(audio_map), 161 }; 162 163 static struct platform_device *migor_snd_device; 164 165 static int __init migor_init(void) 166 { 167 int ret; 168 169 ret = clk_register(&siumckb_clk); 170 if (ret < 0) 171 return ret; 172 173 siumckb_lookup = clkdev_alloc(&siumckb_clk, "siumckb_clk", NULL); 174 if (!siumckb_lookup) { 175 ret = -ENOMEM; 176 goto eclkdevalloc; 177 } 178 clkdev_add(siumckb_lookup); 179 180 /* Port number used on this machine: port B */ 181 migor_snd_device = platform_device_alloc("soc-audio", 1); 182 if (!migor_snd_device) { 183 ret = -ENOMEM; 184 goto epdevalloc; 185 } 186 187 platform_set_drvdata(migor_snd_device, &snd_soc_migor); 188 189 ret = platform_device_add(migor_snd_device); 190 if (ret) 191 goto epdevadd; 192 193 return 0; 194 195 epdevadd: 196 platform_device_put(migor_snd_device); 197 epdevalloc: 198 clkdev_drop(siumckb_lookup); 199 eclkdevalloc: 200 clk_unregister(&siumckb_clk); 201 return ret; 202 } 203 204 static void __exit migor_exit(void) 205 { 206 clkdev_drop(siumckb_lookup); 207 clk_unregister(&siumckb_clk); 208 platform_device_unregister(migor_snd_device); 209 } 210 211 module_init(migor_init); 212 module_exit(migor_exit); 213 214 MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>"); 215 MODULE_DESCRIPTION("ALSA SoC Migor"); 216 MODULE_LICENSE("GPL v2"); 217