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/pinctrl/consumer.h> 42 43 #include <linux/atmel-ssc.h> 44 45 #include <sound/core.h> 46 #include <sound/pcm.h> 47 #include <sound/pcm_params.h> 48 #include <sound/soc.h> 49 50 #include <asm/mach-types.h> 51 #include <mach/hardware.h> 52 #include <mach/gpio.h> 53 54 #include "../codecs/wm8731.h" 55 #include "atmel-pcm.h" 56 #include "atmel_ssc_dai.h" 57 58 #define MCLK_RATE 12000000 59 60 /* 61 * As shipped the board does not have inputs. However, it is relatively 62 * straightforward to modify the board to hook them up so support is left 63 * in the driver. 64 */ 65 #undef ENABLE_MIC_INPUT 66 67 static struct clk *mclk; 68 69 static int at91sam9g20ek_hw_params(struct snd_pcm_substream *substream, 70 struct snd_pcm_hw_params *params) 71 { 72 struct snd_soc_pcm_runtime *rtd = substream->private_data; 73 struct snd_soc_dai *codec_dai = rtd->codec_dai; 74 struct snd_soc_dai *cpu_dai = rtd->cpu_dai; 75 int ret; 76 77 /* set codec DAI configuration */ 78 ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_I2S | 79 SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBM_CFM); 80 if (ret < 0) 81 return ret; 82 83 /* set cpu DAI configuration */ 84 ret = snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S | 85 SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBM_CFM); 86 if (ret < 0) 87 return ret; 88 89 return 0; 90 } 91 92 static struct snd_soc_ops at91sam9g20ek_ops = { 93 .hw_params = at91sam9g20ek_hw_params, 94 }; 95 96 static int at91sam9g20ek_set_bias_level(struct snd_soc_card *card, 97 struct snd_soc_dapm_context *dapm, 98 enum snd_soc_bias_level level) 99 { 100 static int mclk_on; 101 int ret = 0; 102 103 switch (level) { 104 case SND_SOC_BIAS_ON: 105 case SND_SOC_BIAS_PREPARE: 106 if (!mclk_on) 107 ret = clk_enable(mclk); 108 if (ret == 0) 109 mclk_on = 1; 110 break; 111 112 case SND_SOC_BIAS_OFF: 113 case SND_SOC_BIAS_STANDBY: 114 if (mclk_on) 115 clk_disable(mclk); 116 mclk_on = 0; 117 break; 118 } 119 120 return ret; 121 } 122 123 static const struct snd_soc_dapm_widget at91sam9g20ek_dapm_widgets[] = { 124 SND_SOC_DAPM_MIC("Int Mic", NULL), 125 SND_SOC_DAPM_SPK("Ext Spk", NULL), 126 }; 127 128 static const struct snd_soc_dapm_route intercon[] = { 129 130 /* speaker connected to LHPOUT */ 131 {"Ext Spk", NULL, "LHPOUT"}, 132 133 /* mic is connected to Mic Jack, with WM8731 Mic Bias */ 134 {"MICIN", NULL, "Mic Bias"}, 135 {"Mic Bias", NULL, "Int Mic"}, 136 }; 137 138 /* 139 * Logic for a wm8731 as connected on a at91sam9g20ek board. 140 */ 141 static int at91sam9g20ek_wm8731_init(struct snd_soc_pcm_runtime *rtd) 142 { 143 struct snd_soc_codec *codec = rtd->codec; 144 struct snd_soc_dai *codec_dai = rtd->codec_dai; 145 struct snd_soc_dapm_context *dapm = &codec->dapm; 146 int ret; 147 148 printk(KERN_DEBUG 149 "at91sam9g20ek_wm8731 " 150 ": at91sam9g20ek_wm8731_init() called\n"); 151 152 ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_MCLK, 153 MCLK_RATE, SND_SOC_CLOCK_IN); 154 if (ret < 0) { 155 printk(KERN_ERR "Failed to set WM8731 SYSCLK: %d\n", ret); 156 return ret; 157 } 158 159 /* Add specific widgets */ 160 snd_soc_dapm_new_controls(dapm, at91sam9g20ek_dapm_widgets, 161 ARRAY_SIZE(at91sam9g20ek_dapm_widgets)); 162 /* Set up specific audio path interconnects */ 163 snd_soc_dapm_add_routes(dapm, intercon, ARRAY_SIZE(intercon)); 164 165 /* not connected */ 166 snd_soc_dapm_nc_pin(dapm, "RLINEIN"); 167 snd_soc_dapm_nc_pin(dapm, "LLINEIN"); 168 169 #ifdef ENABLE_MIC_INPUT 170 snd_soc_dapm_enable_pin(dapm, "Int Mic"); 171 #else 172 snd_soc_dapm_nc_pin(dapm, "Int Mic"); 173 #endif 174 175 /* always connected */ 176 snd_soc_dapm_enable_pin(dapm, "Ext Spk"); 177 178 return 0; 179 } 180 181 static struct snd_soc_dai_link at91sam9g20ek_dai = { 182 .name = "WM8731", 183 .stream_name = "WM8731 PCM", 184 .cpu_dai_name = "at91rm9200_ssc.0", 185 .codec_dai_name = "wm8731-hifi", 186 .init = at91sam9g20ek_wm8731_init, 187 .platform_name = "at91rm9200_ssc.0", 188 .codec_name = "wm8731.0-001b", 189 .ops = &at91sam9g20ek_ops, 190 }; 191 192 static struct snd_soc_card snd_soc_at91sam9g20ek = { 193 .name = "AT91SAMG20-EK", 194 .owner = THIS_MODULE, 195 .dai_link = &at91sam9g20ek_dai, 196 .num_links = 1, 197 .set_bias_level = at91sam9g20ek_set_bias_level, 198 }; 199 200 static int at91sam9g20ek_audio_probe(struct platform_device *pdev) 201 { 202 struct device_node *np = pdev->dev.of_node; 203 struct device_node *codec_np, *cpu_np; 204 struct clk *pllb; 205 struct snd_soc_card *card = &snd_soc_at91sam9g20ek; 206 struct pinctrl *pinctrl; 207 int ret; 208 209 pinctrl = devm_pinctrl_get_select_default(&pdev->dev); 210 if (IS_ERR(pinctrl)) { 211 dev_err(&pdev->dev, "Failed to request pinctrl for mck\n"); 212 return PTR_ERR(pinctrl); 213 } 214 215 if (!np) { 216 if (!(machine_is_at91sam9g20ek() || 217 machine_is_at91sam9g20ek_2mmc())) 218 return -ENODEV; 219 } 220 221 ret = atmel_ssc_set_audio(0); 222 if (ret) { 223 dev_err(&pdev->dev, "ssc channel is not valid\n"); 224 return -EINVAL; 225 } 226 227 /* 228 * Codec MCLK is supplied by PCK0 - set it up. 229 */ 230 mclk = clk_get(NULL, "pck0"); 231 if (IS_ERR(mclk)) { 232 printk(KERN_ERR "ASoC: Failed to get MCLK\n"); 233 ret = PTR_ERR(mclk); 234 goto err; 235 } 236 237 pllb = clk_get(NULL, "pllb"); 238 if (IS_ERR(pllb)) { 239 printk(KERN_ERR "ASoC: Failed to get PLLB\n"); 240 ret = PTR_ERR(pllb); 241 goto err_mclk; 242 } 243 ret = clk_set_parent(mclk, pllb); 244 clk_put(pllb); 245 if (ret != 0) { 246 printk(KERN_ERR "ASoC: Failed to set MCLK parent\n"); 247 goto err_mclk; 248 } 249 250 clk_set_rate(mclk, MCLK_RATE); 251 252 card->dev = &pdev->dev; 253 254 /* Parse device node info */ 255 if (np) { 256 ret = snd_soc_of_parse_card_name(card, "atmel,model"); 257 if (ret) 258 goto err; 259 260 ret = snd_soc_of_parse_audio_routing(card, 261 "atmel,audio-routing"); 262 if (ret) 263 goto err; 264 265 /* Parse codec info */ 266 at91sam9g20ek_dai.codec_name = NULL; 267 codec_np = of_parse_phandle(np, "atmel,audio-codec", 0); 268 if (!codec_np) { 269 dev_err(&pdev->dev, "codec info missing\n"); 270 return -EINVAL; 271 } 272 at91sam9g20ek_dai.codec_of_node = codec_np; 273 274 /* Parse dai and platform info */ 275 at91sam9g20ek_dai.cpu_dai_name = NULL; 276 at91sam9g20ek_dai.platform_name = NULL; 277 cpu_np = of_parse_phandle(np, "atmel,ssc-controller", 0); 278 if (!cpu_np) { 279 dev_err(&pdev->dev, "dai and pcm info missing\n"); 280 return -EINVAL; 281 } 282 at91sam9g20ek_dai.cpu_of_node = cpu_np; 283 at91sam9g20ek_dai.platform_of_node = cpu_np; 284 285 of_node_put(codec_np); 286 of_node_put(cpu_np); 287 } 288 289 ret = snd_soc_register_card(card); 290 if (ret) { 291 printk(KERN_ERR "ASoC: snd_soc_register_card() failed\n"); 292 } 293 294 return ret; 295 296 err_mclk: 297 clk_put(mclk); 298 mclk = NULL; 299 err: 300 atmel_ssc_put_audio(0); 301 return ret; 302 } 303 304 static int at91sam9g20ek_audio_remove(struct platform_device *pdev) 305 { 306 struct snd_soc_card *card = platform_get_drvdata(pdev); 307 308 atmel_ssc_put_audio(0); 309 snd_soc_unregister_card(card); 310 clk_put(mclk); 311 mclk = NULL; 312 313 return 0; 314 } 315 316 #ifdef CONFIG_OF 317 static const struct of_device_id at91sam9g20ek_wm8731_dt_ids[] = { 318 { .compatible = "atmel,at91sam9g20ek-wm8731-audio", }, 319 { } 320 }; 321 MODULE_DEVICE_TABLE(of, at91sam9g20ek_wm8731_dt_ids); 322 #endif 323 324 static struct platform_driver at91sam9g20ek_audio_driver = { 325 .driver = { 326 .name = "at91sam9g20ek-audio", 327 .owner = THIS_MODULE, 328 .of_match_table = of_match_ptr(at91sam9g20ek_wm8731_dt_ids), 329 }, 330 .probe = at91sam9g20ek_audio_probe, 331 .remove = at91sam9g20ek_audio_remove, 332 }; 333 334 module_platform_driver(at91sam9g20ek_audio_driver); 335 336 /* Module information */ 337 MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>"); 338 MODULE_DESCRIPTION("ALSA SoC AT91SAM9G20EK_WM8731"); 339 MODULE_ALIAS("platform:at91sam9g20ek-audio"); 340 MODULE_LICENSE("GPL"); 341