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Linux/sound/soc/samsung/s3c24xx_simtec.c

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  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");
373 

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