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 codec_freq = rate * 512; 67 /* 68 * This propagates the parent frequency change to children and 69 * recalculates the frequency table 70 */ 71 clk_set_rate(&siumckb_clk, codec_freq); 72 dev_dbg(codec_dai->dev, "%s: configure %luHz\n", __func__, codec_freq); 73 74 ret = snd_soc_dai_set_sysclk(rtd->cpu_dai, SIU_CLKB_EXT, 75 codec_freq / 2, SND_SOC_CLOCK_IN); 76 77 if (!ret) 78 use_count++; 79 80 return ret; 81 } 82 83 static int migor_hw_free(struct snd_pcm_substream *substream) 84 { 85 struct snd_soc_pcm_runtime *rtd = substream->private_data; 86 struct snd_soc_dai *codec_dai = rtd->codec_dai; 87 88 if (use_count) { 89 use_count--; 90 91 if (!use_count) 92 snd_soc_dai_set_sysclk(codec_dai, WM8978_PLL, 0, 93 SND_SOC_CLOCK_IN); 94 } else { 95 dev_dbg(codec_dai->dev, "Unbalanced hw_free!\n"); 96 } 97 98 return 0; 99 } 100 101 static struct snd_soc_ops migor_dai_ops = { 102 .hw_params = migor_hw_params, 103 .hw_free = migor_hw_free, 104 }; 105 106 static const struct snd_soc_dapm_widget migor_dapm_widgets[] = { 107 SND_SOC_DAPM_HP("Headphone", NULL), 108 SND_SOC_DAPM_MIC("Onboard Microphone", NULL), 109 SND_SOC_DAPM_MIC("External Microphone", NULL), 110 }; 111 112 static const struct snd_soc_dapm_route audio_map[] = { 113 /* Headphone output connected to LHP/RHP, enable OUT4 for VMID */ 114 { "Headphone", NULL, "OUT4 VMID" }, 115 { "OUT4 VMID", NULL, "LHP" }, 116 { "OUT4 VMID", NULL, "RHP" }, 117 118 /* On-board microphone */ 119 { "RMICN", NULL, "Mic Bias" }, 120 { "RMICP", NULL, "Mic Bias" }, 121 { "Mic Bias", NULL, "Onboard Microphone" }, 122 123 /* External microphone */ 124 { "LMICN", NULL, "Mic Bias" }, 125 { "LMICP", NULL, "Mic Bias" }, 126 { "Mic Bias", NULL, "External Microphone" }, 127 }; 128 129 /* migor digital audio interface glue - connects codec <--> CPU */ 130 static struct snd_soc_dai_link migor_dai = { 131 .name = "wm8978", 132 .stream_name = "WM8978", 133 .cpu_dai_name = "siu-pcm-audio", 134 .codec_dai_name = "wm8978-hifi", 135 .platform_name = "siu-pcm-audio", 136 .codec_name = "wm8978.0-001a", 137 .dai_fmt = SND_SOC_DAIFMT_NB_IF | SND_SOC_DAIFMT_I2S | 138 SND_SOC_DAIFMT_CBS_CFS, 139 .ops = &migor_dai_ops, 140 }; 141 142 /* migor audio machine driver */ 143 static struct snd_soc_card snd_soc_migor = { 144 .name = "Migo-R", 145 .owner = THIS_MODULE, 146 .dai_link = &migor_dai, 147 .num_links = 1, 148 149 .dapm_widgets = migor_dapm_widgets, 150 .num_dapm_widgets = ARRAY_SIZE(migor_dapm_widgets), 151 .dapm_routes = audio_map, 152 .num_dapm_routes = ARRAY_SIZE(audio_map), 153 }; 154 155 static struct platform_device *migor_snd_device; 156 157 static int __init migor_init(void) 158 { 159 int ret; 160 161 ret = clk_register(&siumckb_clk); 162 if (ret < 0) 163 return ret; 164 165 siumckb_lookup = clkdev_create(&siumckb_clk, "siumckb_clk", NULL); 166 if (!siumckb_lookup) { 167 ret = -ENOMEM; 168 goto eclkdevalloc; 169 } 170 171 /* Port number used on this machine: port B */ 172 migor_snd_device = platform_device_alloc("soc-audio", 1); 173 if (!migor_snd_device) { 174 ret = -ENOMEM; 175 goto epdevalloc; 176 } 177 178 platform_set_drvdata(migor_snd_device, &snd_soc_migor); 179 180 ret = platform_device_add(migor_snd_device); 181 if (ret) 182 goto epdevadd; 183 184 return 0; 185 186 epdevadd: 187 platform_device_put(migor_snd_device); 188 epdevalloc: 189 clkdev_drop(siumckb_lookup); 190 eclkdevalloc: 191 clk_unregister(&siumckb_clk); 192 return ret; 193 } 194 195 static void __exit migor_exit(void) 196 { 197 clkdev_drop(siumckb_lookup); 198 clk_unregister(&siumckb_clk); 199 platform_device_unregister(migor_snd_device); 200 } 201 202 module_init(migor_init); 203 module_exit(migor_exit); 204 205 MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>"); 206 MODULE_DESCRIPTION("ALSA SoC Migor"); 207 MODULE_LICENSE("GPL v2"); 208