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#include <sound/soc-dapm.h> 48 49#include <asm/mach-types.h> 50#include <mach/hardware.h> 51#include <mach/gpio.h> 52 53#include "../codecs/wm8731.h" 54#include "atmel-pcm.h" 55#include "atmel_ssc_dai.h" 56 57#define MCLK_RATE 12000000 58 59/* 60 * As shipped the board does not have inputs. However, it is relatively 61 * straightforward to modify the board to hook them up so support is left 62 * in the driver. 63 */ 64#undef ENABLE_MIC_INPUT 65 66static struct clk *mclk; 67 68static int at91sam9g20ek_hw_params(struct snd_pcm_substream *substream, 69 struct snd_pcm_hw_params *params) 70{ 71 struct snd_soc_pcm_runtime *rtd = substream->private_data; 72 struct snd_soc_dai *codec_dai = rtd->dai->codec_dai; 73 struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai; 74 int ret; 75 76 /* set codec DAI configuration */ 77 ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_I2S | 78 SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBM_CFM); 79 if (ret < 0) 80 return ret; 81 82 /* set cpu DAI configuration */ 83 ret = snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S | 84 SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBM_CFM); 85 if (ret < 0) 86 return ret; 87 88 return 0; 89} 90 91static struct snd_soc_ops at91sam9g20ek_ops = { 92 .hw_params = at91sam9g20ek_hw_params, 93}; 94 95static int at91sam9g20ek_set_bias_level(struct snd_soc_card *card, 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 121static 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 126static 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 */ 139static int at91sam9g20ek_wm8731_init(struct snd_soc_codec *codec) 140{ 141 struct snd_soc_dai *codec_dai = &codec->dai[0]; 142 int ret; 143 144 printk(KERN_DEBUG 145 "at91sam9g20ek_wm8731 " 146 ": at91sam9g20ek_wm8731_init() called\n"); 147 148 ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK, 149 MCLK_RATE, SND_SOC_CLOCK_IN); 150 if (ret < 0) { 151 printk(KERN_ERR "Failed to set WM8731 SYSCLK: %d\n", ret); 152 return ret; 153 } 154 155 /* Add specific widgets */ 156 snd_soc_dapm_new_controls(codec, at91sam9g20ek_dapm_widgets, 157 ARRAY_SIZE(at91sam9g20ek_dapm_widgets)); 158 /* Set up specific audio path interconnects */ 159 snd_soc_dapm_add_routes(codec, intercon, ARRAY_SIZE(intercon)); 160 161 /* not connected */ 162 snd_soc_dapm_nc_pin(codec, "RLINEIN"); 163 snd_soc_dapm_nc_pin(codec, "LLINEIN"); 164 165#ifdef ENABLE_MIC_INPUT 166 snd_soc_dapm_enable_pin(codec, "Int Mic"); 167#else 168 snd_soc_dapm_nc_pin(codec, "Int Mic"); 169#endif 170 171 /* always connected */ 172 snd_soc_dapm_enable_pin(codec, "Ext Spk"); 173 174 snd_soc_dapm_sync(codec); 175 176 return 0; 177} 178 179static struct snd_soc_dai_link at91sam9g20ek_dai = { 180 .name = "WM8731", 181 .stream_name = "WM8731 PCM", 182 .cpu_dai = &atmel_ssc_dai[0], 183 .codec_dai = &wm8731_dai, 184 .init = at91sam9g20ek_wm8731_init, 185 .ops = &at91sam9g20ek_ops, 186}; 187 188static struct snd_soc_card snd_soc_at91sam9g20ek = { 189 .name = "AT91SAMG20-EK", 190 .platform = &atmel_soc_platform, 191 .dai_link = &at91sam9g20ek_dai, 192 .num_links = 1, 193 .set_bias_level = at91sam9g20ek_set_bias_level, 194}; 195 196static struct snd_soc_device at91sam9g20ek_snd_devdata = { 197 .card = &snd_soc_at91sam9g20ek, 198 .codec_dev = &soc_codec_dev_wm8731, 199}; 200 201static struct platform_device *at91sam9g20ek_snd_device; 202 203static int __init at91sam9g20ek_init(void) 204{ 205 struct atmel_ssc_info *ssc_p = at91sam9g20ek_dai.cpu_dai->private_data; 206 struct ssc_device *ssc = NULL; 207 struct clk *pllb; 208 int ret; 209 210 if (!(machine_is_at91sam9g20ek() || machine_is_at91sam9g20ek_2mmc())) 211 return -ENODEV; 212 213 /* 214 * Codec MCLK is supplied by PCK0 - set it up. 215 */ 216 mclk = clk_get(NULL, "pck0"); 217 if (IS_ERR(mclk)) { 218 printk(KERN_ERR "ASoC: Failed to get MCLK\n"); 219 ret = PTR_ERR(mclk); 220 goto err; 221 } 222 223 pllb = clk_get(NULL, "pllb"); 224 if (IS_ERR(mclk)) { 225 printk(KERN_ERR "ASoC: Failed to get PLLB\n"); 226 ret = PTR_ERR(mclk); 227 goto err_mclk; 228 } 229 ret = clk_set_parent(mclk, pllb); 230 clk_put(pllb); 231 if (ret != 0) { 232 printk(KERN_ERR "ASoC: Failed to set MCLK parent\n"); 233 goto err_mclk; 234 } 235 236 clk_set_rate(mclk, MCLK_RATE); 237 238 /* 239 * Request SSC device 240 */ 241 ssc = ssc_request(0); 242 if (IS_ERR(ssc)) { 243 printk(KERN_ERR "ASoC: Failed to request SSC 0\n"); 244 ret = PTR_ERR(ssc); 245 ssc = NULL; 246 goto err_ssc; 247 } 248 ssc_p->ssc = ssc; 249 250 at91sam9g20ek_snd_device = platform_device_alloc("soc-audio", -1); 251 if (!at91sam9g20ek_snd_device) { 252 printk(KERN_ERR "ASoC: Platform device allocation failed\n"); 253 ret = -ENOMEM; 254 } 255 256 platform_set_drvdata(at91sam9g20ek_snd_device, 257 &at91sam9g20ek_snd_devdata); 258 at91sam9g20ek_snd_devdata.dev = &at91sam9g20ek_snd_device->dev; 259 260 ret = platform_device_add(at91sam9g20ek_snd_device); 261 if (ret) { 262 printk(KERN_ERR "ASoC: Platform device allocation failed\n"); 263 platform_device_put(at91sam9g20ek_snd_device); 264 } 265 266 return ret; 267 268err_ssc: 269 ssc_free(ssc); 270 ssc_p->ssc = NULL; 271err_mclk: 272 clk_put(mclk); 273 mclk = NULL; 274err: 275 return ret; 276} 277 278static void __exit at91sam9g20ek_exit(void) 279{ 280 struct atmel_ssc_info *ssc_p = at91sam9g20ek_dai.cpu_dai->private_data; 281 struct ssc_device *ssc; 282 283 if (ssc_p != NULL) { 284 ssc = ssc_p->ssc; 285 if (ssc != NULL) 286 ssc_free(ssc); 287 ssc_p->ssc = NULL; 288 } 289 290 platform_device_unregister(at91sam9g20ek_snd_device); 291 at91sam9g20ek_snd_device = NULL; 292 clk_put(mclk); 293 mclk = NULL; 294} 295 296module_init(at91sam9g20ek_init); 297module_exit(at91sam9g20ek_exit); 298 299/* Module information */ 300MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>"); 301MODULE_DESCRIPTION("ALSA SoC AT91SAM9G20EK_WM8731"); 302MODULE_LICENSE("GPL"); 303