release/src-rt-6.x.4708/linux/linux-2.6.36/sound/soc/s3c24xx/s3c24xx_simtec.c

   1 /* sound/soc/s3c24xx/s3c24xx_simtec.c
   2  *
   3  * Copyright 2009 Simtec Electronics
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8 */
   9
  10 #include <linux/module.h>
  11 #include <linux/moduleparam.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/gpio.h>
  14 #include <linux/clk.h>
  15 #include <linux/i2c.h>
  16
  17 #include <sound/core.h>
  18 #include <sound/pcm.h>
  19 #include <sound/soc.h>
  20 #include <sound/soc-dapm.h>
  21
  22 #include <plat/audio-simtec.h>
  23
  24 #include "s3c-dma.h"
  25 #include "s3c24xx-i2s.h"
  26 #include "s3c24xx_simtec.h"
  27
  28 static struct s3c24xx_audio_simtec_pdata *pdata;
  29 static struct clk *xtal_clk;
  30
  31 static int spk_gain;
  32 static int spk_unmute;
  33
  34 /**
  35  * speaker_gain_get - read the speaker gain setting.
  36  * @kcontrol: The control for the speaker gain.
  37  * @ucontrol: The value that needs to be updated.
  38  *
  39  * Read the value for the AMP gain control.
  40  */
  41 static int speaker_gain_get(struct snd_kcontrol *kcontrol,
  42                             struct snd_ctl_elem_value *ucontrol)
  43 {
  44         ucontrol->value.integer.value[0] = spk_gain;
  45         return 0;
  46 }
  47
  48 /**
  49  * speaker_gain_set - set the value of the speaker amp gain
  50  * @value: The value to write.
  51  */
  52 static void speaker_gain_set(int value)
  53 {
  54         gpio_set_value_cansleep(pdata->amp_gain[0], value & 1);
  55         gpio_set_value_cansleep(pdata->amp_gain[1], value >> 1);
  56 }
  57
  58 /**
  59  * speaker_gain_put - set the speaker gain setting.
  60  * @kcontrol: The control for the speaker gain.
  61  * @ucontrol: The value that needs to be set.
  62  *
  63  * Set the value of the speaker gain from the specified
  64  * @ucontrol setting.
  65  *
  66  * Note, if the speaker amp is muted, then we do not set a gain value
  67  * as at-least one of the ICs that is fitted will try and power up even
  68  * if the main control is set to off.
  69  */
  70 static int speaker_gain_put(struct snd_kcontrol *kcontrol,
  71                             struct snd_ctl_elem_value *ucontrol)
  72 {
  73         int value = ucontrol->value.integer.value[0];
  74
  75         spk_gain = value;
  76
  77         if (!spk_unmute)
  78                 speaker_gain_set(value);
  79
  80         return 0;
  81 }
  82
  83 static const struct snd_kcontrol_new amp_gain_controls[] = {
  84         SOC_SINGLE_EXT("Speaker Gain", 0, 0, 3, 0,
  85                        speaker_gain_get, speaker_gain_put),
  86 };
  87
  88 /**
  89  * spk_unmute_state - set the unmute state of the speaker
  90  * @to: zero to unmute, non-zero to ununmute.
  91  */
  92 static void spk_unmute_state(int to)
  93 {
  94         pr_debug("%s: to=%d\n", __func__, to);
  95
  96         spk_unmute = to;
  97         gpio_set_value(pdata->amp_gpio, to);
  98
  99         /* if we're umuting, also re-set the gain */
 100         if (to && pdata->amp_gain[0] > 0)
 101                 speaker_gain_set(spk_gain);
 102 }
 103
 104 /**
 105  * speaker_unmute_get - read the speaker unmute setting.
 106  * @kcontrol: The control for the speaker gain.
 107  * @ucontrol: The value that needs to be updated.
 108  *
 109  * Read the value for the AMP gain control.
 110  */
 111 static int speaker_unmute_get(struct snd_kcontrol *kcontrol,
 112                             struct snd_ctl_elem_value *ucontrol)
 113 {
 114         ucontrol->value.integer.value[0] = spk_unmute;
 115         return 0;
 116 }
 117
 118 /**
 119  * speaker_unmute_put - set the speaker unmute setting.
 120  * @kcontrol: The control for the speaker gain.
 121  * @ucontrol: The value that needs to be set.
 122  *
 123  * Set the value of the speaker gain from the specified
 124  * @ucontrol setting.
 125  */
 126 static int speaker_unmute_put(struct snd_kcontrol *kcontrol,
 127                             struct snd_ctl_elem_value *ucontrol)
 128 {
 129         spk_unmute_state(ucontrol->value.integer.value[0]);
 130         return 0;
 131 }
 132
 133 /* This is added as a manual control as the speaker amps create clicks
 134  * when their power state is changed, which are far more noticeable than
 135  * anything produced by the CODEC itself.
 136  */
 137 static const struct snd_kcontrol_new amp_unmute_controls[] = {
 138         SOC_SINGLE_EXT("Speaker Switch", 0, 0, 1, 0,
 139                        speaker_unmute_get, speaker_unmute_put),
 140 };
 141
 142 void simtec_audio_init(struct snd_soc_codec *codec)
 143 {
 144         if (pdata->amp_gpio > 0) {
 145                 pr_debug("%s: adding amp routes\n", __func__);
 146
 147                 snd_soc_add_controls(codec, amp_unmute_controls,
 148                                      ARRAY_SIZE(amp_unmute_controls));
 149         }
 150
 151         if (pdata->amp_gain[0] > 0) {
 152                 pr_debug("%s: adding amp controls\n", __func__);
 153                 snd_soc_add_controls(codec, amp_gain_controls,
 154                                      ARRAY_SIZE(amp_gain_controls));
 155         }
 156 }
 157 EXPORT_SYMBOL_GPL(simtec_audio_init);
 158
 159 #define CODEC_CLOCK 12000000
 160
 161 /**
 162  * simtec_hw_params - update hardware parameters
 163  * @substream: The audio substream instance.
 164  * @params: The parameters requested.
 165  *
 166  * Update the codec data routing and configuration  settings
 167  * from the supplied data.
 168  */
 169 static int simtec_hw_params(struct snd_pcm_substream *substream,
 170                             struct snd_pcm_hw_params *params)
 171 {
 172         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 173         struct snd_soc_dai *codec_dai = rtd->dai->codec_dai;
 174         struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
 175         int ret;
 176
 177         /* Set the CODEC as the bus clock master, I2S */
 178         ret = snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S |
 179                                   SND_SOC_DAIFMT_NB_NF |
 180                                   SND_SOC_DAIFMT_CBM_CFM);
 181         if (ret) {
 182                 pr_err("%s: failed set cpu dai format\n", __func__);
 183                 return ret;
 184         }
 185
 186         /* Set the CODEC as the bus clock master */
 187         ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_I2S |
 188                                   SND_SOC_DAIFMT_NB_NF |
 189                                   SND_SOC_DAIFMT_CBM_CFM);
 190         if (ret) {
 191                 pr_err("%s: failed set codec dai format\n", __func__);
 192                 return ret;
 193         }
 194
 195         ret = snd_soc_dai_set_sysclk(codec_dai, 0,
 196                                      CODEC_CLOCK, SND_SOC_CLOCK_IN);
 197         if (ret) {
 198                 pr_err( "%s: failed setting codec sysclk\n", __func__);
 199                 return ret;
 200         }
 201
 202         if (pdata->use_mpllin) {
 203                 ret = snd_soc_dai_set_sysclk(cpu_dai, S3C24XX_CLKSRC_MPLL,
 204                                              0, SND_SOC_CLOCK_OUT);
 205
 206                 if (ret) {
 207                         pr_err("%s: failed to set MPLLin as clksrc\n",
 208                                __func__);
 209                         return ret;
 210                 }
 211         }
 212
 213         if (pdata->output_cdclk) {
 214                 int cdclk_scale;
 215
 216                 cdclk_scale = clk_get_rate(xtal_clk) / CODEC_CLOCK;
 217                 cdclk_scale--;
 218
 219                 ret = snd_soc_dai_set_clkdiv(cpu_dai, S3C24XX_DIV_PRESCALER,
 220                                              cdclk_scale);
 221         }
 222
 223         return 0;
 224 }
 225
 226 static int simtec_call_startup(struct s3c24xx_audio_simtec_pdata *pd)
 227 {
 228         /* call any board supplied startup code, this currently only
 229          * covers the bast/vr1000 which have a CPLD in the way of the
 230          * LRCLK */
 231         if (pd->startup)
 232                 pd->startup();
 233
 234         return 0;
 235 }
 236
 237 static struct snd_soc_ops simtec_snd_ops = {
 238         .hw_params      = simtec_hw_params,
 239 };
 240
 241 /**
 242  * attach_gpio_amp - get and configure the necessary gpios
 243  * @dev: The device we're probing.
 244  * @pd: The platform data supplied by the board.
 245  *
 246  * If there is a GPIO based amplifier attached to the board, claim
 247  * the necessary GPIO lines for it, and set default values.
 248  */
 249 static int attach_gpio_amp(struct device *dev,
 250                            struct s3c24xx_audio_simtec_pdata *pd)
 251 {
 252         int ret;
 253
 254         /* attach gpio amp gain (if any) */
 255         if (pdata->amp_gain[0] > 0) {
 256                 ret = gpio_request(pd->amp_gain[0], "gpio-amp-gain0");
 257                 if (ret) {
 258                         dev_err(dev, "cannot get amp gpio gain0\n");
 259                         return ret;
 260                 }
 261
 262                 ret = gpio_request(pd->amp_gain[1], "gpio-amp-gain1");
 263                 if (ret) {
 264                         dev_err(dev, "cannot get amp gpio gain1\n");
 265                         gpio_free(pdata->amp_gain[0]);
 266                         return ret;
 267                 }
 268
 269                 gpio_direction_output(pd->amp_gain[0], 0);
 270                 gpio_direction_output(pd->amp_gain[1], 0);
 271         }
 272
 273         /* note, currently we assume GPA0 isn't valid amp */
 274         if (pdata->amp_gpio > 0) {
 275                 ret = gpio_request(pd->amp_gpio, "gpio-amp");
 276                 if (ret) {
 277                         dev_err(dev, "cannot get amp gpio %d (%d)\n",
 278                                 pd->amp_gpio, ret);
 279                         goto err_amp;
 280                 }
 281
 282                 /* set the amp off at startup */
 283                 spk_unmute_state(0);
 284         }
 285
 286         return 0;
 287
 288 err_amp:
 289         if (pd->amp_gain[0] > 0) {
 290                 gpio_free(pd->amp_gain[0]);
 291                 gpio_free(pd->amp_gain[1]);
 292         }
 293
 294         return ret;
 295 }
 296
 297 static void detach_gpio_amp(struct s3c24xx_audio_simtec_pdata *pd)
 298 {
 299         if (pd->amp_gain[0] > 0) {
 300                 gpio_free(pd->amp_gain[0]);
 301                 gpio_free(pd->amp_gain[1]);
 302         }
 303
 304         if (pd->amp_gpio > 0)
 305                 gpio_free(pd->amp_gpio);
 306 }
 307
 308 #ifdef CONFIG_PM
 309 int simtec_audio_resume(struct device *dev)
 310 {
 311         simtec_call_startup(pdata);
 312         return 0;
 313 }
 314
 315 const struct dev_pm_ops simtec_audio_pmops = {
 316         .resume = simtec_audio_resume,
 317 };
 318 EXPORT_SYMBOL_GPL(simtec_audio_pmops);
 319 #endif
 320
 321 int __devinit simtec_audio_core_probe(struct platform_device *pdev,
 322                                       struct snd_soc_device *socdev)
 323 {
 324         struct platform_device *snd_dev;
 325         int ret;
 326
 327         socdev->card->dai_link->ops = &simtec_snd_ops;
 328
 329         pdata = pdev->dev.platform_data;
 330         if (!pdata) {
 331                 dev_err(&pdev->dev, "no platform data supplied\n");
 332                 return -EINVAL;
 333         }
 334
 335         simtec_call_startup(pdata);
 336
 337         xtal_clk = clk_get(&pdev->dev, "xtal");
 338         if (IS_ERR(xtal_clk)) {
 339                 dev_err(&pdev->dev, "could not get clkout0\n");
 340                 return -EINVAL;
 341         }
 342
 343         dev_info(&pdev->dev, "xtal rate is %ld\n", clk_get_rate(xtal_clk));
 344
 345         ret = attach_gpio_amp(&pdev->dev, pdata);
 346         if (ret)
 347                 goto err_clk;
 348
 349         snd_dev = platform_device_alloc("soc-audio", -1);
 350         if (!snd_dev) {
 351                 dev_err(&pdev->dev, "failed to alloc soc-audio devicec\n");
 352                 ret = -ENOMEM;
 353                 goto err_gpio;
 354         }
 355
 356         platform_set_drvdata(snd_dev, socdev);
 357         socdev->dev = &snd_dev->dev;
 358
 359         ret = platform_device_add(snd_dev);
 360         if (ret) {
 361                 dev_err(&pdev->dev, "failed to add soc-audio dev\n");
 362                 goto err_pdev;
 363         }
 364
 365         platform_set_drvdata(pdev, snd_dev);
 366         return 0;
 367
 368 err_pdev:
 369         platform_device_put(snd_dev);
 370
 371 err_gpio:
 372         detach_gpio_amp(pdata);
 373
 374 err_clk:
 375         clk_put(xtal_clk);
 376         return ret;
 377 }
 378 EXPORT_SYMBOL_GPL(simtec_audio_core_probe);
 379
 380 int __devexit simtec_audio_remove(struct platform_device *pdev)
 381 {
 382         struct platform_device *snd_dev = platform_get_drvdata(pdev);
 383
 384         platform_device_unregister(snd_dev);
 385
 386         detach_gpio_amp(pdata);
 387         clk_put(xtal_clk);
 388         return 0;
 389 }
 390 EXPORT_SYMBOL_GPL(simtec_audio_remove);
 391
 392 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
 393 MODULE_DESCRIPTION("ALSA SoC Simtec Audio common support");
 394 MODULE_LICENSE("GPL");