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         /* Set the CODEC as the bus clock master, I2S */
 173         ret = snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S |
 174                                   SND_SOC_DAIFMT_NB_NF |
 175                                   SND_SOC_DAIFMT_CBM_CFM);
 176         if (ret) {
 177                 pr_err("%s: failed set cpu dai format\n", __func__);
 178                 return ret;
 179         }
 180
 181         /* Set the CODEC as the bus clock master */
 182         ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_I2S |
 183                                   SND_SOC_DAIFMT_NB_NF |
 184                                   SND_SOC_DAIFMT_CBM_CFM);
 185         if (ret) {
 186                 pr_err("%s: failed set codec dai format\n", __func__);
 187                 return ret;
 188         }
 189
 190         ret = snd_soc_dai_set_sysclk(codec_dai, 0,
 191                                      CODEC_CLOCK, SND_SOC_CLOCK_IN);
 192         if (ret) {
 193                 pr_err( "%s: failed setting codec sysclk\n", __func__);
 194                 return ret;
 195         }
 196
 197         if (pdata->use_mpllin) {
 198                 ret = snd_soc_dai_set_sysclk(cpu_dai, S3C24XX_CLKSRC_MPLL,
 199                                              0, SND_SOC_CLOCK_OUT);
 200
 201                 if (ret) {
 202                         pr_err("%s: failed to set MPLLin as clksrc\n",
 203                                __func__);
 204                         return ret;
 205                 }
 206         }
 207
 208         if (pdata->output_cdclk) {
 209                 int cdclk_scale;
 210
 211                 cdclk_scale = clk_get_rate(xtal_clk) / CODEC_CLOCK;
 212                 cdclk_scale--;
 213
 214                 ret = snd_soc_dai_set_clkdiv(cpu_dai, S3C24XX_DIV_PRESCALER,
 215                                              cdclk_scale);
 216         }
 217
 218         return 0;
 219 }
 220
 221 static int simtec_call_startup(struct s3c24xx_audio_simtec_pdata *pd)
 222 {
 223         /* call any board supplied startup code, this currently only
 224          * covers the bast/vr1000 which have a CPLD in the way of the
 225          * LRCLK */
 226         if (pd->startup)
 227                 pd->startup();
 228
 229         return 0;
 230 }
 231
 232 static struct snd_soc_ops simtec_snd_ops = {
 233         .hw_params      = simtec_hw_params,
 234 };
 235
 236 /**
 237  * attach_gpio_amp - get and configure the necessary gpios
 238  * @dev: The device we're probing.
 239  * @pd: The platform data supplied by the board.
 240  *
 241  * If there is a GPIO based amplifier attached to the board, claim
 242  * the necessary GPIO lines for it, and set default values.
 243  */
 244 static int attach_gpio_amp(struct device *dev,
 245                            struct s3c24xx_audio_simtec_pdata *pd)
 246 {
 247         int ret;
 248
 249         /* attach gpio amp gain (if any) */
 250         if (pdata->amp_gain[0] > 0) {
 251                 ret = gpio_request(pd->amp_gain[0], "gpio-amp-gain0");
 252                 if (ret) {
 253                         dev_err(dev, "cannot get amp gpio gain0\n");
 254                         return ret;
 255                 }
 256
 257                 ret = gpio_request(pd->amp_gain[1], "gpio-amp-gain1");
 258                 if (ret) {
 259                         dev_err(dev, "cannot get amp gpio gain1\n");
 260                         gpio_free(pdata->amp_gain[0]);
 261                         return ret;
 262                 }
 263
 264                 gpio_direction_output(pd->amp_gain[0], 0);
 265                 gpio_direction_output(pd->amp_gain[1], 0);
 266         }
 267
 268         /* note, currently we assume GPA0 isn't valid amp */
 269         if (pdata->amp_gpio > 0) {
 270                 ret = gpio_request(pd->amp_gpio, "gpio-amp");
 271                 if (ret) {
 272                         dev_err(dev, "cannot get amp gpio %d (%d)\n",
 273                                 pd->amp_gpio, ret);
 274                         goto err_amp;
 275                 }
 276
 277                 /* set the amp off at startup */
 278                 spk_unmute_state(0);
 279         }
 280
 281         return 0;
 282
 283 err_amp:
 284         if (pd->amp_gain[0] > 0) {
 285                 gpio_free(pd->amp_gain[0]);
 286                 gpio_free(pd->amp_gain[1]);
 287         }
 288
 289         return ret;
 290 }
 291
 292 static void detach_gpio_amp(struct s3c24xx_audio_simtec_pdata *pd)
 293 {
 294         if (pd->amp_gain[0] > 0) {
 295                 gpio_free(pd->amp_gain[0]);
 296                 gpio_free(pd->amp_gain[1]);
 297         }
 298
 299         if (pd->amp_gpio > 0)
 300                 gpio_free(pd->amp_gpio);
 301 }
 302
 303 #ifdef CONFIG_PM
 304 static int simtec_audio_resume(struct device *dev)
 305 {
 306         simtec_call_startup(pdata);
 307         return 0;
 308 }
 309
 310 const struct dev_pm_ops simtec_audio_pmops = {
 311         .resume = simtec_audio_resume,
 312 };
 313 EXPORT_SYMBOL_GPL(simtec_audio_pmops);
 314 #endif
 315
 316 int simtec_audio_core_probe(struct platform_device *pdev,
 317                             struct snd_soc_card *card)
 318 {
 319         struct platform_device *snd_dev;
 320         int ret;
 321
 322         card->dai_link->ops = &simtec_snd_ops;
 323
 324         pdata = pdev->dev.platform_data;
 325         if (!pdata) {
 326                 dev_err(&pdev->dev, "no platform data supplied\n");
 327                 return -EINVAL;
 328         }
 329
 330         simtec_call_startup(pdata);
 331
 332         xtal_clk = clk_get(&pdev->dev, "xtal");
 333         if (IS_ERR(xtal_clk)) {
 334                 dev_err(&pdev->dev, "could not get clkout0\n");
 335                 return -EINVAL;
 336         }
 337
 338         dev_info(&pdev->dev, "xtal rate is %ld\n", clk_get_rate(xtal_clk));
 339
 340         ret = attach_gpio_amp(&pdev->dev, pdata);
 341         if (ret)
 342                 goto err_clk;
 343
 344         snd_dev = platform_device_alloc("soc-audio", -1);
 345         if (!snd_dev) {
 346                 dev_err(&pdev->dev, "failed to alloc soc-audio devicec\n");
 347                 ret = -ENOMEM;
 348                 goto err_gpio;
 349         }
 350
 351         platform_set_drvdata(snd_dev, card);
 352
 353         ret = platform_device_add(snd_dev);
 354         if (ret) {
 355                 dev_err(&pdev->dev, "failed to add soc-audio dev\n");
 356                 goto err_pdev;
 357         }
 358
 359         platform_set_drvdata(pdev, snd_dev);
 360         return 0;
 361
 362 err_pdev:
 363         platform_device_put(snd_dev);
 364
 365 err_gpio:
 366         detach_gpio_amp(pdata);
 367
 368 err_clk:
 369         clk_put(xtal_clk);
 370         return ret;
 371 }
 372 EXPORT_SYMBOL_GPL(simtec_audio_core_probe);
 373
 374 int simtec_audio_remove(struct platform_device *pdev)
 375 {
 376         struct platform_device *snd_dev = platform_get_drvdata(pdev);
 377
 378         platform_device_unregister(snd_dev);
 379
 380         detach_gpio_amp(pdata);
 381         clk_put(xtal_clk);
 382         return 0;
 383 }
 384 EXPORT_SYMBOL_GPL(simtec_audio_remove);
 385
 386 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
 387 MODULE_DESCRIPTION("ALSA SoC Simtec Audio common support");
 388 MODULE_LICENSE("GPL");