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 51 #include "../codecs/wm8731.h" 52 #include "atmel-pcm.h" 53 #include "atmel_ssc_dai.h" 54 55 #define MCLK_RATE 12000000 56 57 /* 58 * As shipped the board does not have inputs. However, it is relatively 59 * straightforward to modify the board to hook them up so support is left 60 * in the driver. 61 */ 62 #undef ENABLE_MIC_INPUT 63 64 static struct clk *mclk; 65 66 static int at91sam9g20ek_set_bias_level(struct snd_soc_card *card, 67 struct snd_soc_dapm_context *dapm, 68 enum snd_soc_bias_level level) 69 { 70 static int mclk_on; 71 int ret = 0; 72 73 switch (level) { 74 case SND_SOC_BIAS_ON: 75 case SND_SOC_BIAS_PREPARE: 76 if (!mclk_on) 77 ret = clk_enable(mclk); 78 if (ret == 0) 79 mclk_on = 1; 80 break; 81 82 case SND_SOC_BIAS_OFF: 83 case SND_SOC_BIAS_STANDBY: 84 if (mclk_on) 85 clk_disable(mclk); 86 mclk_on = 0; 87 break; 88 } 89 90 return ret; 91 } 92 93 static const struct snd_soc_dapm_widget at91sam9g20ek_dapm_widgets[] = { 94 SND_SOC_DAPM_MIC("Int Mic", NULL), 95 SND_SOC_DAPM_SPK("Ext Spk", NULL), 96 }; 97 98 static const struct snd_soc_dapm_route intercon[] = { 99 100 /* speaker connected to LHPOUT */ 101 {"Ext Spk", NULL, "LHPOUT"}, 102 103 /* mic is connected to Mic Jack, with WM8731 Mic Bias */ 104 {"MICIN", NULL, "Mic Bias"}, 105 {"Mic Bias", NULL, "Int Mic"}, 106 }; 107 108 /* 109 * Logic for a wm8731 as connected on a at91sam9g20ek board. 110 */ 111 static int at91sam9g20ek_wm8731_init(struct snd_soc_pcm_runtime *rtd) 112 { 113 struct snd_soc_codec *codec = rtd->codec; 114 struct snd_soc_dai *codec_dai = rtd->codec_dai; 115 struct snd_soc_dapm_context *dapm = &codec->dapm; 116 int ret; 117 118 printk(KERN_DEBUG 119 "at91sam9g20ek_wm8731 " 120 ": at91sam9g20ek_wm8731_init() called\n"); 121 122 ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_MCLK, 123 MCLK_RATE, SND_SOC_CLOCK_IN); 124 if (ret < 0) { 125 printk(KERN_ERR "Failed to set WM8731 SYSCLK: %d\n", ret); 126 return ret; 127 } 128 129 /* not connected */ 130 snd_soc_dapm_nc_pin(dapm, "RLINEIN"); 131 snd_soc_dapm_nc_pin(dapm, "LLINEIN"); 132 133 #ifndef ENABLE_MIC_INPUT 134 snd_soc_dapm_nc_pin(&rtd->card->dapm, "Int Mic"); 135 #endif 136 137 return 0; 138 } 139 140 static struct snd_soc_dai_link at91sam9g20ek_dai = { 141 .name = "WM8731", 142 .stream_name = "WM8731 PCM", 143 .cpu_dai_name = "at91rm9200_ssc.0", 144 .codec_dai_name = "wm8731-hifi", 145 .init = at91sam9g20ek_wm8731_init, 146 .platform_name = "at91rm9200_ssc.0", 147 .codec_name = "wm8731.0-001b", 148 .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF | 149 SND_SOC_DAIFMT_CBM_CFM, 150 }; 151 152 static struct snd_soc_card snd_soc_at91sam9g20ek = { 153 .name = "AT91SAMG20-EK", 154 .owner = THIS_MODULE, 155 .dai_link = &at91sam9g20ek_dai, 156 .num_links = 1, 157 .set_bias_level = at91sam9g20ek_set_bias_level, 158 159 .dapm_widgets = at91sam9g20ek_dapm_widgets, 160 .num_dapm_widgets = ARRAY_SIZE(at91sam9g20ek_dapm_widgets), 161 .dapm_routes = intercon, 162 .num_dapm_routes = ARRAY_SIZE(intercon), 163 }; 164 165 static int at91sam9g20ek_audio_probe(struct platform_device *pdev) 166 { 167 struct device_node *np = pdev->dev.of_node; 168 struct device_node *codec_np, *cpu_np; 169 struct clk *pllb; 170 struct snd_soc_card *card = &snd_soc_at91sam9g20ek; 171 int ret; 172 173 if (!np) { 174 if (!(machine_is_at91sam9g20ek() || 175 machine_is_at91sam9g20ek_2mmc())) 176 return -ENODEV; 177 } 178 179 ret = atmel_ssc_set_audio(0); 180 if (ret) { 181 dev_err(&pdev->dev, "ssc channel is not valid\n"); 182 return -EINVAL; 183 } 184 185 /* 186 * Codec MCLK is supplied by PCK0 - set it up. 187 */ 188 mclk = clk_get(NULL, "pck0"); 189 if (IS_ERR(mclk)) { 190 printk(KERN_ERR "ASoC: Failed to get MCLK\n"); 191 ret = PTR_ERR(mclk); 192 goto err; 193 } 194 195 pllb = clk_get(NULL, "pllb"); 196 if (IS_ERR(pllb)) { 197 printk(KERN_ERR "ASoC: Failed to get PLLB\n"); 198 ret = PTR_ERR(pllb); 199 goto err_mclk; 200 } 201 ret = clk_set_parent(mclk, pllb); 202 clk_put(pllb); 203 if (ret != 0) { 204 printk(KERN_ERR "ASoC: Failed to set MCLK parent\n"); 205 goto err_mclk; 206 } 207 208 clk_set_rate(mclk, MCLK_RATE); 209 210 card->dev = &pdev->dev; 211 212 /* Parse device node info */ 213 if (np) { 214 ret = snd_soc_of_parse_card_name(card, "atmel,model"); 215 if (ret) 216 goto err; 217 218 ret = snd_soc_of_parse_audio_routing(card, 219 "atmel,audio-routing"); 220 if (ret) 221 goto err; 222 223 /* Parse codec info */ 224 at91sam9g20ek_dai.codec_name = NULL; 225 codec_np = of_parse_phandle(np, "atmel,audio-codec", 0); 226 if (!codec_np) { 227 dev_err(&pdev->dev, "codec info missing\n"); 228 return -EINVAL; 229 } 230 at91sam9g20ek_dai.codec_of_node = codec_np; 231 232 /* Parse dai and platform info */ 233 at91sam9g20ek_dai.cpu_dai_name = NULL; 234 at91sam9g20ek_dai.platform_name = NULL; 235 cpu_np = of_parse_phandle(np, "atmel,ssc-controller", 0); 236 if (!cpu_np) { 237 dev_err(&pdev->dev, "dai and pcm info missing\n"); 238 return -EINVAL; 239 } 240 at91sam9g20ek_dai.cpu_of_node = cpu_np; 241 at91sam9g20ek_dai.platform_of_node = cpu_np; 242 243 of_node_put(codec_np); 244 of_node_put(cpu_np); 245 } 246 247 ret = snd_soc_register_card(card); 248 if (ret) { 249 printk(KERN_ERR "ASoC: snd_soc_register_card() failed\n"); 250 } 251 252 return ret; 253 254 err_mclk: 255 clk_put(mclk); 256 mclk = NULL; 257 err: 258 atmel_ssc_put_audio(0); 259 return ret; 260 } 261 262 static int at91sam9g20ek_audio_remove(struct platform_device *pdev) 263 { 264 struct snd_soc_card *card = platform_get_drvdata(pdev); 265 266 clk_disable(mclk); 267 mclk = NULL; 268 snd_soc_unregister_card(card); 269 atmel_ssc_put_audio(0); 270 271 return 0; 272 } 273 274 #ifdef CONFIG_OF 275 static const struct of_device_id at91sam9g20ek_wm8731_dt_ids[] = { 276 { .compatible = "atmel,at91sam9g20ek-wm8731-audio", }, 277 { } 278 }; 279 MODULE_DEVICE_TABLE(of, at91sam9g20ek_wm8731_dt_ids); 280 #endif 281 282 static struct platform_driver at91sam9g20ek_audio_driver = { 283 .driver = { 284 .name = "at91sam9g20ek-audio", 285 .of_match_table = of_match_ptr(at91sam9g20ek_wm8731_dt_ids), 286 }, 287 .probe = at91sam9g20ek_audio_probe, 288 .remove = at91sam9g20ek_audio_remove, 289 }; 290 291 module_platform_driver(at91sam9g20ek_audio_driver); 292 293 /* Module information */ 294 MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>"); 295 MODULE_DESCRIPTION("ALSA SoC AT91SAM9G20EK_WM8731"); 296 MODULE_ALIAS("platform:at91sam9g20ek-audio"); 297 MODULE_LICENSE("GPL"); 298