1 /* 2 * sam9g20_wm8731 -- SoC audio for AT91SAM9G20-based 3 * ATMEL AT91SAM9G20ek board. 4 * 5 * Copyright (C) 2005 SAN People 6 * Copyright (C) 2008 Atmel 7 * 8 * Authors: Sedji Gaouaou <sedji.gaouaou@atmel.com> 9 * 10 * Based on ati_b1_wm8731.c by: 11 * Frank Mandarino <fmandarino@endrelia.com> 12 * Copyright 2006 Endrelia Technologies Inc. 13 * Based on corgi.c by: 14 * Copyright 2005 Wolfson Microelectronics PLC. 15 * Copyright 2005 Openedhand Ltd. 16 * 17 * This program is free software; you can redistribute it and/or modify 18 * it under the terms of the GNU General Public License as published by 19 * the Free Software Foundation; either version 2 of the License, or 20 * (at your option) any later version. 21 * 22 * This program is distributed in the hope that it will be useful, 23 * but WITHOUT ANY WARRANTY; without even the implied warranty of 24 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 25 * GNU General Public License for more details. 26 * 27 * You should have received a copy of the GNU General Public License 28 * along with this program; if not, write to the Free Software 29 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 30 */ 31 32 #include <linux/module.h> 33 #include <linux/moduleparam.h> 34 #include <linux/kernel.h> 35 #include <linux/clk.h> 36 #include <linux/timer.h> 37 #include <linux/interrupt.h> 38 #include <linux/platform_device.h> 39 #include <linux/i2c.h> 40 41 #include <linux/atmel-ssc.h> 42 43 #include <sound/core.h> 44 #include <sound/pcm.h> 45 #include <sound/pcm_params.h> 46 #include <sound/soc.h> 47 48 #include <asm/mach-types.h> 49 #include <mach/hardware.h> 50 #include <mach/gpio.h> 51 52 #include "../codecs/wm8731.h" 53 #include "atmel-pcm.h" 54 #include "atmel_ssc_dai.h" 55 56 #define MCLK_RATE 12000000 57 58 /* 59 * As shipped the board does not have inputs. However, it is relatively 60 * straightforward to modify the board to hook them up so support is left 61 * in the driver. 62 */ 63 #undef ENABLE_MIC_INPUT 64 65 static struct clk *mclk; 66 67 static int at91sam9g20ek_hw_params(struct snd_pcm_substream *substream, 68 struct snd_pcm_hw_params *params) 69 { 70 struct snd_soc_pcm_runtime *rtd = substream->private_data; 71 struct snd_soc_dai *codec_dai = rtd->codec_dai; 72 struct snd_soc_dai *cpu_dai = rtd->cpu_dai; 73 int ret; 74 75 /* set codec DAI configuration */ 76 ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_I2S | 77 SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBM_CFM); 78 if (ret < 0) 79 return ret; 80 81 /* set cpu DAI configuration */ 82 ret = snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S | 83 SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBM_CFM); 84 if (ret < 0) 85 return ret; 86 87 return 0; 88 } 89 90 static struct snd_soc_ops at91sam9g20ek_ops = { 91 .hw_params = at91sam9g20ek_hw_params, 92 }; 93 94 static int at91sam9g20ek_set_bias_level(struct snd_soc_card *card, 95 struct snd_soc_dapm_context *dapm, 96 enum snd_soc_bias_level level) 97 { 98 static int mclk_on; 99 int ret = 0; 100 101 switch (level) { 102 case SND_SOC_BIAS_ON: 103 case SND_SOC_BIAS_PREPARE: 104 if (!mclk_on) 105 ret = clk_enable(mclk); 106 if (ret == 0) 107 mclk_on = 1; 108 break; 109 110 case SND_SOC_BIAS_OFF: 111 case SND_SOC_BIAS_STANDBY: 112 if (mclk_on) 113 clk_disable(mclk); 114 mclk_on = 0; 115 break; 116 } 117 118 return ret; 119 } 120 121 static const struct snd_soc_dapm_widget at91sam9g20ek_dapm_widgets[] = { 122 SND_SOC_DAPM_MIC("Int Mic", NULL), 123 SND_SOC_DAPM_SPK("Ext Spk", NULL), 124 }; 125 126 static const struct snd_soc_dapm_route intercon[] = { 127 128 /* speaker connected to LHPOUT */ 129 {"Ext Spk", NULL, "LHPOUT"}, 130 131 /* mic is connected to Mic Jack, with WM8731 Mic Bias */ 132 {"MICIN", NULL, "Mic Bias"}, 133 {"Mic Bias", NULL, "Int Mic"}, 134 }; 135 136 /* 137 * Logic for a wm8731 as connected on a at91sam9g20ek board. 138 */ 139 static int at91sam9g20ek_wm8731_init(struct snd_soc_pcm_runtime *rtd) 140 { 141 struct snd_soc_codec *codec = rtd->codec; 142 struct snd_soc_dai *codec_dai = rtd->codec_dai; 143 struct snd_soc_dapm_context *dapm = &codec->dapm; 144 int ret; 145 146 printk(KERN_DEBUG 147 "at91sam9g20ek_wm8731 " 148 ": at91sam9g20ek_wm8731_init() called\n"); 149 150 ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_MCLK, 151 MCLK_RATE, SND_SOC_CLOCK_IN); 152 if (ret < 0) { 153 printk(KERN_ERR "Failed to set WM8731 SYSCLK: %d\n", ret); 154 return ret; 155 } 156 157 /* Add specific widgets */ 158 snd_soc_dapm_new_controls(dapm, at91sam9g20ek_dapm_widgets, 159 ARRAY_SIZE(at91sam9g20ek_dapm_widgets)); 160 /* Set up specific audio path interconnects */ 161 snd_soc_dapm_add_routes(dapm, intercon, ARRAY_SIZE(intercon)); 162 163 /* not connected */ 164 snd_soc_dapm_nc_pin(dapm, "RLINEIN"); 165 snd_soc_dapm_nc_pin(dapm, "LLINEIN"); 166 167 #ifdef ENABLE_MIC_INPUT 168 snd_soc_dapm_enable_pin(dapm, "Int Mic"); 169 #else 170 snd_soc_dapm_nc_pin(dapm, "Int Mic"); 171 #endif 172 173 /* always connected */ 174 snd_soc_dapm_enable_pin(dapm, "Ext Spk"); 175 176 return 0; 177 } 178 179 static struct snd_soc_dai_link at91sam9g20ek_dai = { 180 .name = "WM8731", 181 .stream_name = "WM8731 PCM", 182 .cpu_dai_name = "atmel-ssc-dai.0", 183 .codec_dai_name = "wm8731-hifi", 184 .init = at91sam9g20ek_wm8731_init, 185 .platform_name = "atmel-pcm-audio", 186 .codec_name = "wm8731.0-001b", 187 .ops = &at91sam9g20ek_ops, 188 }; 189 190 static struct snd_soc_card snd_soc_at91sam9g20ek = { 191 .name = "AT91SAMG20-EK", 192 .owner = THIS_MODULE, 193 .dai_link = &at91sam9g20ek_dai, 194 .num_links = 1, 195 .set_bias_level = at91sam9g20ek_set_bias_level, 196 }; 197 198 static struct platform_device *at91sam9g20ek_snd_device; 199 200 static int __init at91sam9g20ek_init(void) 201 { 202 struct clk *pllb; 203 int ret; 204 205 if (!(machine_is_at91sam9g20ek() || machine_is_at91sam9g20ek_2mmc())) 206 return -ENODEV; 207 208 ret = atmel_ssc_set_audio(0); 209 if (ret != 0) { 210 pr_err("Failed to set SSC 0 for audio: %d\n", ret); 211 return ret; 212 } 213 214 /* 215 * Codec MCLK is supplied by PCK0 - set it up. 216 */ 217 mclk = clk_get(NULL, "pck0"); 218 if (IS_ERR(mclk)) { 219 printk(KERN_ERR "ASoC: Failed to get MCLK\n"); 220 ret = PTR_ERR(mclk); 221 goto err; 222 } 223 224 pllb = clk_get(NULL, "pllb"); 225 if (IS_ERR(pllb)) { 226 printk(KERN_ERR "ASoC: Failed to get PLLB\n"); 227 ret = PTR_ERR(pllb); 228 goto err_mclk; 229 } 230 ret = clk_set_parent(mclk, pllb); 231 clk_put(pllb); 232 if (ret != 0) { 233 printk(KERN_ERR "ASoC: Failed to set MCLK parent\n"); 234 goto err_mclk; 235 } 236 237 clk_set_rate(mclk, MCLK_RATE); 238 239 at91sam9g20ek_snd_device = platform_device_alloc("soc-audio", -1); 240 if (!at91sam9g20ek_snd_device) { 241 printk(KERN_ERR "ASoC: Platform device allocation failed\n"); 242 ret = -ENOMEM; 243 goto err_mclk; 244 } 245 246 platform_set_drvdata(at91sam9g20ek_snd_device, 247 &snd_soc_at91sam9g20ek); 248 249 ret = platform_device_add(at91sam9g20ek_snd_device); 250 if (ret) { 251 printk(KERN_ERR "ASoC: Platform device allocation failed\n"); 252 goto err_device_add; 253 } 254 255 return ret; 256 257 err_device_add: 258 platform_device_put(at91sam9g20ek_snd_device); 259 err_mclk: 260 clk_put(mclk); 261 mclk = NULL; 262 err: 263 return ret; 264 } 265 266 static void __exit at91sam9g20ek_exit(void) 267 { 268 platform_device_unregister(at91sam9g20ek_snd_device); 269 at91sam9g20ek_snd_device = NULL; 270 clk_put(mclk); 271 mclk = NULL; 272 } 273 274 module_init(at91sam9g20ek_init); 275 module_exit(at91sam9g20ek_exit); 276 277 /* Module information */ 278 MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>"); 279 MODULE_DESCRIPTION("ALSA SoC AT91SAM9G20EK_WM8731"); 280 MODULE_LICENSE("GPL"); 281