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 <asm/mach-types.h> 50 #include <mach/hardware.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 /* not connected */ 158 snd_soc_dapm_nc_pin(dapm, "RLINEIN"); 159 snd_soc_dapm_nc_pin(dapm, "LLINEIN"); 160 161 #ifndef ENABLE_MIC_INPUT 162 snd_soc_dapm_nc_pin(&rtd->card->dapm, "Int Mic"); 163 #endif 164 165 return 0; 166 } 167 168 static struct snd_soc_dai_link at91sam9g20ek_dai = { 169 .name = "WM8731", 170 .stream_name = "WM8731 PCM", 171 .cpu_dai_name = "at91rm9200_ssc.0", 172 .codec_dai_name = "wm8731-hifi", 173 .init = at91sam9g20ek_wm8731_init, 174 .platform_name = "at91rm9200_ssc.0", 175 .codec_name = "wm8731.0-001b", 176 .ops = &at91sam9g20ek_ops, 177 }; 178 179 static struct snd_soc_card snd_soc_at91sam9g20ek = { 180 .name = "AT91SAMG20-EK", 181 .owner = THIS_MODULE, 182 .dai_link = &at91sam9g20ek_dai, 183 .num_links = 1, 184 .set_bias_level = at91sam9g20ek_set_bias_level, 185 186 .dapm_widgets = at91sam9g20ek_dapm_widgets, 187 .num_dapm_widgets = ARRAY_SIZE(at91sam9g20ek_dapm_widgets), 188 .dapm_routes = intercon, 189 .num_dapm_routes = ARRAY_SIZE(intercon), 190 }; 191 192 static int at91sam9g20ek_audio_probe(struct platform_device *pdev) 193 { 194 struct device_node *np = pdev->dev.of_node; 195 struct device_node *codec_np, *cpu_np; 196 struct clk *pllb; 197 struct snd_soc_card *card = &snd_soc_at91sam9g20ek; 198 int ret; 199 200 if (!np) { 201 if (!(machine_is_at91sam9g20ek() || 202 machine_is_at91sam9g20ek_2mmc())) 203 return -ENODEV; 204 } 205 206 ret = atmel_ssc_set_audio(0); 207 if (ret) { 208 dev_err(&pdev->dev, "ssc channel is not valid\n"); 209 return -EINVAL; 210 } 211 212 /* 213 * Codec MCLK is supplied by PCK0 - set it up. 214 */ 215 mclk = clk_get(NULL, "pck0"); 216 if (IS_ERR(mclk)) { 217 printk(KERN_ERR "ASoC: Failed to get MCLK\n"); 218 ret = PTR_ERR(mclk); 219 goto err; 220 } 221 222 pllb = clk_get(NULL, "pllb"); 223 if (IS_ERR(pllb)) { 224 printk(KERN_ERR "ASoC: Failed to get PLLB\n"); 225 ret = PTR_ERR(pllb); 226 goto err_mclk; 227 } 228 ret = clk_set_parent(mclk, pllb); 229 clk_put(pllb); 230 if (ret != 0) { 231 printk(KERN_ERR "ASoC: Failed to set MCLK parent\n"); 232 goto err_mclk; 233 } 234 235 clk_set_rate(mclk, MCLK_RATE); 236 237 card->dev = &pdev->dev; 238 239 /* Parse device node info */ 240 if (np) { 241 ret = snd_soc_of_parse_card_name(card, "atmel,model"); 242 if (ret) 243 goto err; 244 245 ret = snd_soc_of_parse_audio_routing(card, 246 "atmel,audio-routing"); 247 if (ret) 248 goto err; 249 250 /* Parse codec info */ 251 at91sam9g20ek_dai.codec_name = NULL; 252 codec_np = of_parse_phandle(np, "atmel,audio-codec", 0); 253 if (!codec_np) { 254 dev_err(&pdev->dev, "codec info missing\n"); 255 return -EINVAL; 256 } 257 at91sam9g20ek_dai.codec_of_node = codec_np; 258 259 /* Parse dai and platform info */ 260 at91sam9g20ek_dai.cpu_dai_name = NULL; 261 at91sam9g20ek_dai.platform_name = NULL; 262 cpu_np = of_parse_phandle(np, "atmel,ssc-controller", 0); 263 if (!cpu_np) { 264 dev_err(&pdev->dev, "dai and pcm info missing\n"); 265 return -EINVAL; 266 } 267 at91sam9g20ek_dai.cpu_of_node = cpu_np; 268 at91sam9g20ek_dai.platform_of_node = cpu_np; 269 270 of_node_put(codec_np); 271 of_node_put(cpu_np); 272 } 273 274 ret = snd_soc_register_card(card); 275 if (ret) { 276 printk(KERN_ERR "ASoC: snd_soc_register_card() failed\n"); 277 } 278 279 return ret; 280 281 err_mclk: 282 clk_put(mclk); 283 mclk = NULL; 284 err: 285 atmel_ssc_put_audio(0); 286 return ret; 287 } 288 289 static int at91sam9g20ek_audio_remove(struct platform_device *pdev) 290 { 291 struct snd_soc_card *card = platform_get_drvdata(pdev); 292 293 clk_disable(mclk); 294 mclk = NULL; 295 snd_soc_unregister_card(card); 296 atmel_ssc_put_audio(0); 297 298 return 0; 299 } 300 301 #ifdef CONFIG_OF 302 static const struct of_device_id at91sam9g20ek_wm8731_dt_ids[] = { 303 { .compatible = "atmel,at91sam9g20ek-wm8731-audio", }, 304 { } 305 }; 306 MODULE_DEVICE_TABLE(of, at91sam9g20ek_wm8731_dt_ids); 307 #endif 308 309 static struct platform_driver at91sam9g20ek_audio_driver = { 310 .driver = { 311 .name = "at91sam9g20ek-audio", 312 .of_match_table = of_match_ptr(at91sam9g20ek_wm8731_dt_ids), 313 }, 314 .probe = at91sam9g20ek_audio_probe, 315 .remove = at91sam9g20ek_audio_remove, 316 }; 317 318 module_platform_driver(at91sam9g20ek_audio_driver); 319 320 /* Module information */ 321 MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>"); 322 MODULE_DESCRIPTION("ALSA SoC AT91SAM9G20EK_WM8731"); 323 MODULE_ALIAS("platform:at91sam9g20ek-audio"); 324 MODULE_LICENSE("GPL"); 325