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 = "at91rm9200_ssc.0", 183 .codec_dai_name = "wm8731-hifi", 184 .init = at91sam9g20ek_wm8731_init, 185 .platform_name = "at91rm9200_ssc.0", 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 int at91sam9g20ek_audio_probe(struct platform_device *pdev) 199 { 200 struct device_node *np = pdev->dev.of_node; 201 struct device_node *codec_np, *cpu_np; 202 struct clk *pllb; 203 struct snd_soc_card *card = &snd_soc_at91sam9g20ek; 204 int ret; 205 206 if (!np) { 207 if (!(machine_is_at91sam9g20ek() || 208 machine_is_at91sam9g20ek_2mmc())) 209 return -ENODEV; 210 } 211 212 ret = atmel_ssc_set_audio(0); 213 if (ret) { 214 dev_err(&pdev->dev, "ssc channel is not valid\n"); 215 return -EINVAL; 216 } 217 218 /* 219 * Codec MCLK is supplied by PCK0 - set it up. 220 */ 221 mclk = clk_get(NULL, "pck0"); 222 if (IS_ERR(mclk)) { 223 printk(KERN_ERR "ASoC: Failed to get MCLK\n"); 224 ret = PTR_ERR(mclk); 225 goto err; 226 } 227 228 pllb = clk_get(NULL, "pllb"); 229 if (IS_ERR(pllb)) { 230 printk(KERN_ERR "ASoC: Failed to get PLLB\n"); 231 ret = PTR_ERR(pllb); 232 goto err_mclk; 233 } 234 ret = clk_set_parent(mclk, pllb); 235 clk_put(pllb); 236 if (ret != 0) { 237 printk(KERN_ERR "ASoC: Failed to set MCLK parent\n"); 238 goto err_mclk; 239 } 240 241 clk_set_rate(mclk, MCLK_RATE); 242 243 card->dev = &pdev->dev; 244 245 /* Parse device node info */ 246 if (np) { 247 ret = snd_soc_of_parse_card_name(card, "atmel,model"); 248 if (ret) 249 goto err; 250 251 ret = snd_soc_of_parse_audio_routing(card, 252 "atmel,audio-routing"); 253 if (ret) 254 goto err; 255 256 /* Parse codec info */ 257 at91sam9g20ek_dai.codec_name = NULL; 258 codec_np = of_parse_phandle(np, "atmel,audio-codec", 0); 259 if (!codec_np) { 260 dev_err(&pdev->dev, "codec info missing\n"); 261 return -EINVAL; 262 } 263 at91sam9g20ek_dai.codec_of_node = codec_np; 264 265 /* Parse dai and platform info */ 266 at91sam9g20ek_dai.cpu_dai_name = NULL; 267 at91sam9g20ek_dai.platform_name = NULL; 268 cpu_np = of_parse_phandle(np, "atmel,ssc-controller", 0); 269 if (!cpu_np) { 270 dev_err(&pdev->dev, "dai and pcm info missing\n"); 271 return -EINVAL; 272 } 273 at91sam9g20ek_dai.cpu_of_node = cpu_np; 274 at91sam9g20ek_dai.platform_of_node = cpu_np; 275 276 of_node_put(codec_np); 277 of_node_put(cpu_np); 278 } 279 280 ret = snd_soc_register_card(card); 281 if (ret) { 282 printk(KERN_ERR "ASoC: snd_soc_register_card() failed\n"); 283 } 284 285 return ret; 286 287 err_mclk: 288 clk_put(mclk); 289 mclk = NULL; 290 err: 291 atmel_ssc_put_audio(0); 292 return ret; 293 } 294 295 static int at91sam9g20ek_audio_remove(struct platform_device *pdev) 296 { 297 struct snd_soc_card *card = platform_get_drvdata(pdev); 298 299 clk_disable(mclk); 300 mclk = NULL; 301 snd_soc_unregister_card(card); 302 atmel_ssc_put_audio(0); 303 304 return 0; 305 } 306 307 #ifdef CONFIG_OF 308 static const struct of_device_id at91sam9g20ek_wm8731_dt_ids[] = { 309 { .compatible = "atmel,at91sam9g20ek-wm8731-audio", }, 310 { } 311 }; 312 MODULE_DEVICE_TABLE(of, at91sam9g20ek_wm8731_dt_ids); 313 #endif 314 315 static struct platform_driver at91sam9g20ek_audio_driver = { 316 .driver = { 317 .name = "at91sam9g20ek-audio", 318 .owner = THIS_MODULE, 319 .of_match_table = of_match_ptr(at91sam9g20ek_wm8731_dt_ids), 320 }, 321 .probe = at91sam9g20ek_audio_probe, 322 .remove = at91sam9g20ek_audio_remove, 323 }; 324 325 module_platform_driver(at91sam9g20ek_audio_driver); 326 327 /* Module information */ 328 MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>"); 329 MODULE_DESCRIPTION("ALSA SoC AT91SAM9G20EK_WM8731"); 330 MODULE_ALIAS("platform:at91sam9g20ek-audio"); 331 MODULE_LICENSE("GPL"); 332