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 #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 66 static struct clk *mclk; 67 68 static 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->codec_dai; 73 struct snd_soc_dai *cpu_dai = rtd->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 91 static struct snd_soc_ops at91sam9g20ek_ops = { 92 .hw_params = at91sam9g20ek_hw_params, 93 }; 94 95 static int at91sam9g20ek_set_bias_level(struct snd_soc_card *card, 96 struct snd_soc_dapm_context *dapm, 97 enum snd_soc_bias_level level) 98 { 99 static int mclk_on; 100 int ret = 0; 101 102 switch (level) { 103 case SND_SOC_BIAS_ON: 104 case SND_SOC_BIAS_PREPARE: 105 if (!mclk_on) 106 ret = clk_enable(mclk); 107 if (ret == 0) 108 mclk_on = 1; 109 break; 110 111 case SND_SOC_BIAS_OFF: 112 case SND_SOC_BIAS_STANDBY: 113 if (mclk_on) 114 clk_disable(mclk); 115 mclk_on = 0; 116 break; 117 } 118 119 return ret; 120 } 121 122 static const struct snd_soc_dapm_widget at91sam9g20ek_dapm_widgets[] = { 123 SND_SOC_DAPM_MIC("Int Mic", NULL), 124 SND_SOC_DAPM_SPK("Ext Spk", NULL), 125 }; 126 127 static const struct snd_soc_dapm_route intercon[] = { 128 129 /* speaker connected to LHPOUT */ 130 {"Ext Spk", NULL, "LHPOUT"}, 131 132 /* mic is connected to Mic Jack, with WM8731 Mic Bias */ 133 {"MICIN", NULL, "Mic Bias"}, 134 {"Mic Bias", NULL, "Int Mic"}, 135 }; 136 137 /* 138 * Logic for a wm8731 as connected on a at91sam9g20ek board. 139 */ 140 static int at91sam9g20ek_wm8731_init(struct snd_soc_pcm_runtime *rtd) 141 { 142 struct snd_soc_codec *codec = rtd->codec; 143 struct snd_soc_dai *codec_dai = rtd->codec_dai; 144 struct snd_soc_dapm_context *dapm = &codec->dapm; 145 int ret; 146 147 printk(KERN_DEBUG 148 "at91sam9g20ek_wm8731 " 149 ": at91sam9g20ek_wm8731_init() called\n"); 150 151 ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_MCLK, 152 MCLK_RATE, SND_SOC_CLOCK_IN); 153 if (ret < 0) { 154 printk(KERN_ERR "Failed to set WM8731 SYSCLK: %d\n", ret); 155 return ret; 156 } 157 158 /* not connected */ 159 snd_soc_dapm_nc_pin(dapm, "RLINEIN"); 160 snd_soc_dapm_nc_pin(dapm, "LLINEIN"); 161 162 #ifndef ENABLE_MIC_INPUT 163 snd_soc_dapm_nc_pin(&rtd->card->dapm, "Int Mic"); 164 #endif 165 166 return 0; 167 } 168 169 static struct snd_soc_dai_link at91sam9g20ek_dai = { 170 .name = "WM8731", 171 .stream_name = "WM8731 PCM", 172 .cpu_dai_name = "at91rm9200_ssc.0", 173 .codec_dai_name = "wm8731-hifi", 174 .init = at91sam9g20ek_wm8731_init, 175 .platform_name = "at91rm9200_ssc.0", 176 .codec_name = "wm8731.0-001b", 177 .ops = &at91sam9g20ek_ops, 178 }; 179 180 static struct snd_soc_card snd_soc_at91sam9g20ek = { 181 .name = "AT91SAMG20-EK", 182 .owner = THIS_MODULE, 183 .dai_link = &at91sam9g20ek_dai, 184 .num_links = 1, 185 .set_bias_level = at91sam9g20ek_set_bias_level, 186 187 .dapm_widgets = at91sam9g20ek_dapm_widgets, 188 .num_dapm_widgets = ARRAY_SIZE(at91sam9g20ek_dapm_widgets), 189 .dapm_routes = intercon, 190 .num_dapm_routes = ARRAY_SIZE(intercon), 191 }; 192 193 static int at91sam9g20ek_audio_probe(struct platform_device *pdev) 194 { 195 struct device_node *np = pdev->dev.of_node; 196 struct device_node *codec_np, *cpu_np; 197 struct clk *pllb; 198 struct snd_soc_card *card = &snd_soc_at91sam9g20ek; 199 int ret; 200 201 if (!np) { 202 if (!(machine_is_at91sam9g20ek() || 203 machine_is_at91sam9g20ek_2mmc())) 204 return -ENODEV; 205 } 206 207 ret = atmel_ssc_set_audio(0); 208 if (ret) { 209 dev_err(&pdev->dev, "ssc channel is not valid\n"); 210 return -EINVAL; 211 } 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(pllb)) { 225 printk(KERN_ERR "ASoC: Failed to get PLLB\n"); 226 ret = PTR_ERR(pllb); 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 card->dev = &pdev->dev; 239 240 /* Parse device node info */ 241 if (np) { 242 ret = snd_soc_of_parse_card_name(card, "atmel,model"); 243 if (ret) 244 goto err; 245 246 ret = snd_soc_of_parse_audio_routing(card, 247 "atmel,audio-routing"); 248 if (ret) 249 goto err; 250 251 /* Parse codec info */ 252 at91sam9g20ek_dai.codec_name = NULL; 253 codec_np = of_parse_phandle(np, "atmel,audio-codec", 0); 254 if (!codec_np) { 255 dev_err(&pdev->dev, "codec info missing\n"); 256 return -EINVAL; 257 } 258 at91sam9g20ek_dai.codec_of_node = codec_np; 259 260 /* Parse dai and platform info */ 261 at91sam9g20ek_dai.cpu_dai_name = NULL; 262 at91sam9g20ek_dai.platform_name = NULL; 263 cpu_np = of_parse_phandle(np, "atmel,ssc-controller", 0); 264 if (!cpu_np) { 265 dev_err(&pdev->dev, "dai and pcm info missing\n"); 266 return -EINVAL; 267 } 268 at91sam9g20ek_dai.cpu_of_node = cpu_np; 269 at91sam9g20ek_dai.platform_of_node = cpu_np; 270 271 of_node_put(codec_np); 272 of_node_put(cpu_np); 273 } 274 275 ret = snd_soc_register_card(card); 276 if (ret) { 277 printk(KERN_ERR "ASoC: snd_soc_register_card() failed\n"); 278 } 279 280 return ret; 281 282 err_mclk: 283 clk_put(mclk); 284 mclk = NULL; 285 err: 286 atmel_ssc_put_audio(0); 287 return ret; 288 } 289 290 static int at91sam9g20ek_audio_remove(struct platform_device *pdev) 291 { 292 struct snd_soc_card *card = platform_get_drvdata(pdev); 293 294 clk_disable(mclk); 295 mclk = NULL; 296 snd_soc_unregister_card(card); 297 atmel_ssc_put_audio(0); 298 299 return 0; 300 } 301 302 #ifdef CONFIG_OF 303 static const struct of_device_id at91sam9g20ek_wm8731_dt_ids[] = { 304 { .compatible = "atmel,at91sam9g20ek-wm8731-audio", }, 305 { } 306 }; 307 MODULE_DEVICE_TABLE(of, at91sam9g20ek_wm8731_dt_ids); 308 #endif 309 310 static struct platform_driver at91sam9g20ek_audio_driver = { 311 .driver = { 312 .name = "at91sam9g20ek-audio", 313 .owner = THIS_MODULE, 314 .of_match_table = of_match_ptr(at91sam9g20ek_wm8731_dt_ids), 315 }, 316 .probe = at91sam9g20ek_audio_probe, 317 .remove = at91sam9g20ek_audio_remove, 318 }; 319 320 module_platform_driver(at91sam9g20ek_audio_driver); 321 322 /* Module information */ 323 MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>"); 324 MODULE_DESCRIPTION("ALSA SoC AT91SAM9G20EK_WM8731"); 325 MODULE_ALIAS("platform:at91sam9g20ek-audio"); 326 MODULE_LICENSE("GPL"); 327