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 #include <linux/of.h> 41 42 #include <linux/atmel-ssc.h> 43 44 #include <sound/core.h> 45 #include <sound/pcm.h> 46 #include <sound/pcm_params.h> 47 #include <sound/soc.h> 48 49 #include "../codecs/wm8731.h" 50 #include "atmel-pcm.h" 51 #include "atmel_ssc_dai.h" 52 53 #define MCLK_RATE 12000000 54 55 /* 56 * As shipped the board does not have inputs. However, it is relatively 57 * straightforward to modify the board to hook them up so support is left 58 * in the driver. 59 */ 60 #undef ENABLE_MIC_INPUT 61 62 static struct clk *mclk; 63 64 static int at91sam9g20ek_set_bias_level(struct snd_soc_card *card, 65 struct snd_soc_dapm_context *dapm, 66 enum snd_soc_bias_level level) 67 { 68 static int mclk_on; 69 int ret = 0; 70 71 switch (level) { 72 case SND_SOC_BIAS_ON: 73 case SND_SOC_BIAS_PREPARE: 74 if (!mclk_on) 75 ret = clk_enable(mclk); 76 if (ret == 0) 77 mclk_on = 1; 78 break; 79 80 case SND_SOC_BIAS_OFF: 81 case SND_SOC_BIAS_STANDBY: 82 if (mclk_on) 83 clk_disable(mclk); 84 mclk_on = 0; 85 break; 86 } 87 88 return ret; 89 } 90 91 static const struct snd_soc_dapm_widget at91sam9g20ek_dapm_widgets[] = { 92 SND_SOC_DAPM_MIC("Int Mic", NULL), 93 SND_SOC_DAPM_SPK("Ext Spk", NULL), 94 }; 95 96 static const struct snd_soc_dapm_route intercon[] = { 97 98 /* speaker connected to LHPOUT */ 99 {"Ext Spk", NULL, "LHPOUT"}, 100 101 /* mic is connected to Mic Jack, with WM8731 Mic Bias */ 102 {"MICIN", NULL, "Mic Bias"}, 103 {"Mic Bias", NULL, "Int Mic"}, 104 }; 105 106 /* 107 * Logic for a wm8731 as connected on a at91sam9g20ek board. 108 */ 109 static int at91sam9g20ek_wm8731_init(struct snd_soc_pcm_runtime *rtd) 110 { 111 struct snd_soc_codec *codec = rtd->codec; 112 struct snd_soc_dai *codec_dai = rtd->codec_dai; 113 struct snd_soc_dapm_context *dapm = &codec->dapm; 114 int ret; 115 116 printk(KERN_DEBUG 117 "at91sam9g20ek_wm8731 " 118 ": at91sam9g20ek_wm8731_init() called\n"); 119 120 ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_MCLK, 121 MCLK_RATE, SND_SOC_CLOCK_IN); 122 if (ret < 0) { 123 printk(KERN_ERR "Failed to set WM8731 SYSCLK: %d\n", ret); 124 return ret; 125 } 126 127 /* not connected */ 128 snd_soc_dapm_nc_pin(dapm, "RLINEIN"); 129 snd_soc_dapm_nc_pin(dapm, "LLINEIN"); 130 131 #ifndef ENABLE_MIC_INPUT 132 snd_soc_dapm_nc_pin(&rtd->card->dapm, "Int Mic"); 133 #endif 134 135 return 0; 136 } 137 138 static struct snd_soc_dai_link at91sam9g20ek_dai = { 139 .name = "WM8731", 140 .stream_name = "WM8731 PCM", 141 .cpu_dai_name = "at91rm9200_ssc.0", 142 .codec_dai_name = "wm8731-hifi", 143 .init = at91sam9g20ek_wm8731_init, 144 .platform_name = "at91rm9200_ssc.0", 145 .codec_name = "wm8731.0-001b", 146 .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF | 147 SND_SOC_DAIFMT_CBM_CFM, 148 }; 149 150 static struct snd_soc_card snd_soc_at91sam9g20ek = { 151 .name = "AT91SAMG20-EK", 152 .owner = THIS_MODULE, 153 .dai_link = &at91sam9g20ek_dai, 154 .num_links = 1, 155 .set_bias_level = at91sam9g20ek_set_bias_level, 156 157 .dapm_widgets = at91sam9g20ek_dapm_widgets, 158 .num_dapm_widgets = ARRAY_SIZE(at91sam9g20ek_dapm_widgets), 159 .dapm_routes = intercon, 160 .num_dapm_routes = ARRAY_SIZE(intercon), 161 }; 162 163 static int at91sam9g20ek_audio_probe(struct platform_device *pdev) 164 { 165 struct device_node *np = pdev->dev.of_node; 166 struct device_node *codec_np, *cpu_np; 167 struct clk *pllb; 168 struct snd_soc_card *card = &snd_soc_at91sam9g20ek; 169 int ret; 170 171 if (!np) { 172 return -ENODEV; 173 } 174 175 ret = atmel_ssc_set_audio(0); 176 if (ret) { 177 dev_err(&pdev->dev, "ssc channel is not valid\n"); 178 return -EINVAL; 179 } 180 181 /* 182 * Codec MCLK is supplied by PCK0 - set it up. 183 */ 184 mclk = clk_get(NULL, "pck0"); 185 if (IS_ERR(mclk)) { 186 printk(KERN_ERR "ASoC: Failed to get MCLK\n"); 187 ret = PTR_ERR(mclk); 188 goto err; 189 } 190 191 pllb = clk_get(NULL, "pllb"); 192 if (IS_ERR(pllb)) { 193 printk(KERN_ERR "ASoC: Failed to get PLLB\n"); 194 ret = PTR_ERR(pllb); 195 goto err_mclk; 196 } 197 ret = clk_set_parent(mclk, pllb); 198 clk_put(pllb); 199 if (ret != 0) { 200 printk(KERN_ERR "ASoC: Failed to set MCLK parent\n"); 201 goto err_mclk; 202 } 203 204 clk_set_rate(mclk, MCLK_RATE); 205 206 card->dev = &pdev->dev; 207 208 /* Parse device node info */ 209 ret = snd_soc_of_parse_card_name(card, "atmel,model"); 210 if (ret) 211 goto err; 212 213 ret = snd_soc_of_parse_audio_routing(card, 214 "atmel,audio-routing"); 215 if (ret) 216 goto err; 217 218 /* Parse codec info */ 219 at91sam9g20ek_dai.codec_name = NULL; 220 codec_np = of_parse_phandle(np, "atmel,audio-codec", 0); 221 if (!codec_np) { 222 dev_err(&pdev->dev, "codec info missing\n"); 223 return -EINVAL; 224 } 225 at91sam9g20ek_dai.codec_of_node = codec_np; 226 227 /* Parse dai and platform info */ 228 at91sam9g20ek_dai.cpu_dai_name = NULL; 229 at91sam9g20ek_dai.platform_name = NULL; 230 cpu_np = of_parse_phandle(np, "atmel,ssc-controller", 0); 231 if (!cpu_np) { 232 dev_err(&pdev->dev, "dai and pcm info missing\n"); 233 return -EINVAL; 234 } 235 at91sam9g20ek_dai.cpu_of_node = cpu_np; 236 at91sam9g20ek_dai.platform_of_node = cpu_np; 237 238 of_node_put(codec_np); 239 of_node_put(cpu_np); 240 241 ret = snd_soc_register_card(card); 242 if (ret) { 243 printk(KERN_ERR "ASoC: snd_soc_register_card() failed\n"); 244 } 245 246 return ret; 247 248 err_mclk: 249 clk_put(mclk); 250 mclk = NULL; 251 err: 252 atmel_ssc_put_audio(0); 253 return ret; 254 } 255 256 static int at91sam9g20ek_audio_remove(struct platform_device *pdev) 257 { 258 struct snd_soc_card *card = platform_get_drvdata(pdev); 259 260 clk_disable(mclk); 261 mclk = NULL; 262 snd_soc_unregister_card(card); 263 atmel_ssc_put_audio(0); 264 265 return 0; 266 } 267 268 #ifdef CONFIG_OF 269 static const struct of_device_id at91sam9g20ek_wm8731_dt_ids[] = { 270 { .compatible = "atmel,at91sam9g20ek-wm8731-audio", }, 271 { } 272 }; 273 MODULE_DEVICE_TABLE(of, at91sam9g20ek_wm8731_dt_ids); 274 #endif 275 276 static struct platform_driver at91sam9g20ek_audio_driver = { 277 .driver = { 278 .name = "at91sam9g20ek-audio", 279 .of_match_table = of_match_ptr(at91sam9g20ek_wm8731_dt_ids), 280 }, 281 .probe = at91sam9g20ek_audio_probe, 282 .remove = at91sam9g20ek_audio_remove, 283 }; 284 285 module_platform_driver(at91sam9g20ek_audio_driver); 286 287 /* Module information */ 288 MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>"); 289 MODULE_DESCRIPTION("ALSA SoC AT91SAM9G20EK_WM8731"); 290 MODULE_ALIAS("platform:at91sam9g20ek-audio"); 291 MODULE_LICENSE("GPL"); 292