sound/soc/samsung/s3c24xx_simtec.c

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