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Linux/sound/soc/samsung/s3c24xx_uda134x.c

  1 /*
  2  * Modifications by Christian Pellegrin <chripell@evolware.org>
  3  *
  4  * s3c24xx_uda134x.c  --  S3C24XX_UDA134X ALSA SoC Audio board driver
  5  *
  6  * Copyright 2007 Dension Audio Systems Ltd.
  7  * Author: Zoltan Devai
  8  *
  9  * This program is free software; you can redistribute it and/or modify
 10  * it under the terms of the GNU General Public License version 2 as
 11  * published by the Free Software Foundation.
 12  */
 13 
 14 #include <linux/clk.h>
 15 #include <linux/gpio.h>
 16 #include <linux/module.h>
 17 
 18 #include <sound/soc.h>
 19 #include <sound/s3c24xx_uda134x.h>
 20 
 21 #include "regs-iis.h"
 22 
 23 #include "s3c24xx-i2s.h"
 24 
 25 /* #define ENFORCE_RATES 1 */
 26 /*
 27   Unfortunately the S3C24XX in master mode has a limited capacity of
 28   generating the clock for the codec. If you define this only rates
 29   that are really available will be enforced. But be careful, most
 30   user level application just want the usual sampling frequencies (8,
 31   11.025, 22.050, 44.1 kHz) and anyway resampling is a costly
 32   operation for embedded systems. So if you aren't very lucky or your
 33   hardware engineer wasn't very forward-looking it's better to leave
 34   this undefined. If you do so an approximate value for the requested
 35   sampling rate in the range -/+ 5% will be chosen. If this in not
 36   possible an error will be returned.
 37 */
 38 
 39 static struct clk *xtal;
 40 static struct clk *pclk;
 41 /* this is need because we don't have a place where to keep the
 42  * pointers to the clocks in each substream. We get the clocks only
 43  * when we are actually using them so we don't block stuff like
 44  * frequency change or oscillator power-off */
 45 static int clk_users;
 46 static DEFINE_MUTEX(clk_lock);
 47 
 48 static unsigned int rates[33 * 2];
 49 #ifdef ENFORCE_RATES
 50 static struct snd_pcm_hw_constraint_list hw_constraints_rates = {
 51         .count  = ARRAY_SIZE(rates),
 52         .list   = rates,
 53         .mask   = 0,
 54 };
 55 #endif
 56 
 57 static struct platform_device *s3c24xx_uda134x_snd_device;
 58 
 59 static int s3c24xx_uda134x_startup(struct snd_pcm_substream *substream)
 60 {
 61         int ret = 0;
 62 #ifdef ENFORCE_RATES
 63         struct snd_pcm_runtime *runtime = substream->runtime;
 64 #endif
 65 
 66         mutex_lock(&clk_lock);
 67         pr_debug("%s %d\n", __func__, clk_users);
 68         if (clk_users == 0) {
 69                 xtal = clk_get(&s3c24xx_uda134x_snd_device->dev, "xtal");
 70                 if (IS_ERR(xtal)) {
 71                         printk(KERN_ERR "%s cannot get xtal\n", __func__);
 72                         ret = PTR_ERR(xtal);
 73                 } else {
 74                         pclk = clk_get(&s3c24xx_uda134x_snd_device->dev,
 75                                        "pclk");
 76                         if (IS_ERR(pclk)) {
 77                                 printk(KERN_ERR "%s cannot get pclk\n",
 78                                        __func__);
 79                                 clk_put(xtal);
 80                                 ret = PTR_ERR(pclk);
 81                         }
 82                 }
 83                 if (!ret) {
 84                         int i, j;
 85 
 86                         for (i = 0; i < 2; i++) {
 87                                 int fs = i ? 256 : 384;
 88 
 89                                 rates[i*33] = clk_get_rate(xtal) / fs;
 90                                 for (j = 1; j < 33; j++)
 91                                         rates[i*33 + j] = clk_get_rate(pclk) /
 92                                                 (j * fs);
 93                         }
 94                 }
 95         }
 96         clk_users += 1;
 97         mutex_unlock(&clk_lock);
 98         if (!ret) {
 99 #ifdef ENFORCE_RATES
100                 ret = snd_pcm_hw_constraint_list(runtime, 0,
101                                                  SNDRV_PCM_HW_PARAM_RATE,
102                                                  &hw_constraints_rates);
103                 if (ret < 0)
104                         printk(KERN_ERR "%s cannot set constraints\n",
105                                __func__);
106 #endif
107         }
108         return ret;
109 }
110 
111 static void s3c24xx_uda134x_shutdown(struct snd_pcm_substream *substream)
112 {
113         mutex_lock(&clk_lock);
114         pr_debug("%s %d\n", __func__, clk_users);
115         clk_users -= 1;
116         if (clk_users == 0) {
117                 clk_put(xtal);
118                 xtal = NULL;
119                 clk_put(pclk);
120                 pclk = NULL;
121         }
122         mutex_unlock(&clk_lock);
123 }
124 
125 static int s3c24xx_uda134x_hw_params(struct snd_pcm_substream *substream,
126                                         struct snd_pcm_hw_params *params)
127 {
128         struct snd_soc_pcm_runtime *rtd = substream->private_data;
129         struct snd_soc_dai *codec_dai = rtd->codec_dai;
130         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
131         unsigned int clk = 0;
132         int ret = 0;
133         int clk_source, fs_mode;
134         unsigned long rate = params_rate(params);
135         long err, cerr;
136         unsigned int div;
137         int i, bi;
138 
139         err = 999999;
140         bi = 0;
141         for (i = 0; i < 2*33; i++) {
142                 cerr = rates[i] - rate;
143                 if (cerr < 0)
144                         cerr = -cerr;
145                 if (cerr < err) {
146                         err = cerr;
147                         bi = i;
148                 }
149         }
150         if (bi / 33 == 1)
151                 fs_mode = S3C2410_IISMOD_256FS;
152         else
153                 fs_mode = S3C2410_IISMOD_384FS;
154         if (bi % 33 == 0) {
155                 clk_source = S3C24XX_CLKSRC_MPLL;
156                 div = 1;
157         } else {
158                 clk_source = S3C24XX_CLKSRC_PCLK;
159                 div = bi % 33;
160         }
161         pr_debug("%s desired rate %lu, %d\n", __func__, rate, bi);
162 
163         clk = (fs_mode == S3C2410_IISMOD_384FS ? 384 : 256) * rate;
164         pr_debug("%s will use: %s %s %d sysclk %d err %ld\n", __func__,
165                  fs_mode == S3C2410_IISMOD_384FS ? "384FS" : "256FS",
166                  clk_source == S3C24XX_CLKSRC_MPLL ? "MPLLin" : "PCLK",
167                  div, clk, err);
168 
169         if ((err * 100 / rate) > 5) {
170                 printk(KERN_ERR "S3C24XX_UDA134X: effective frequency "
171                        "too different from desired (%ld%%)\n",
172                        err * 100 / rate);
173                 return -EINVAL;
174         }
175 
176         ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_I2S |
177                         SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS);
178         if (ret < 0)
179                 return ret;
180 
181         ret = snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S |
182                         SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS);
183         if (ret < 0)
184                 return ret;
185 
186         ret = snd_soc_dai_set_sysclk(cpu_dai, clk_source , clk,
187                         SND_SOC_CLOCK_IN);
188         if (ret < 0)
189                 return ret;
190 
191         ret = snd_soc_dai_set_clkdiv(cpu_dai, S3C24XX_DIV_MCLK, fs_mode);
192         if (ret < 0)
193                 return ret;
194 
195         ret = snd_soc_dai_set_clkdiv(cpu_dai, S3C24XX_DIV_BCLK,
196                         S3C2410_IISMOD_32FS);
197         if (ret < 0)
198                 return ret;
199 
200         ret = snd_soc_dai_set_clkdiv(cpu_dai, S3C24XX_DIV_PRESCALER,
201                         S3C24XX_PRESCALE(div, div));
202         if (ret < 0)
203                 return ret;
204 
205         /* set the codec system clock for DAC and ADC */
206         ret = snd_soc_dai_set_sysclk(codec_dai, 0, clk,
207                         SND_SOC_CLOCK_OUT);
208         if (ret < 0)
209                 return ret;
210 
211         return 0;
212 }
213 
214 static struct snd_soc_ops s3c24xx_uda134x_ops = {
215         .startup = s3c24xx_uda134x_startup,
216         .shutdown = s3c24xx_uda134x_shutdown,
217         .hw_params = s3c24xx_uda134x_hw_params,
218 };
219 
220 static struct snd_soc_dai_link s3c24xx_uda134x_dai_link = {
221         .name = "UDA134X",
222         .stream_name = "UDA134X",
223         .codec_name = "uda134x-codec",
224         .codec_dai_name = "uda134x-hifi",
225         .cpu_dai_name = "s3c24xx-iis",
226         .ops = &s3c24xx_uda134x_ops,
227         .platform_name  = "s3c24xx-iis",
228 };
229 
230 static struct snd_soc_card snd_soc_s3c24xx_uda134x = {
231         .name = "S3C24XX_UDA134X",
232         .owner = THIS_MODULE,
233         .dai_link = &s3c24xx_uda134x_dai_link,
234         .num_links = 1,
235 };
236 
237 static struct s3c24xx_uda134x_platform_data *s3c24xx_uda134x_l3_pins;
238 
239 static void setdat(int v)
240 {
241         gpio_set_value(s3c24xx_uda134x_l3_pins->l3_data, v > 0);
242 }
243 
244 static void setclk(int v)
245 {
246         gpio_set_value(s3c24xx_uda134x_l3_pins->l3_clk, v > 0);
247 }
248 
249 static void setmode(int v)
250 {
251         gpio_set_value(s3c24xx_uda134x_l3_pins->l3_mode, v > 0);
252 }
253 
254 /* FIXME - This must be codec platform data but in which board file ?? */
255 static struct uda134x_platform_data s3c24xx_uda134x = {
256         .l3 = {
257                 .setdat = setdat,
258                 .setclk = setclk,
259                 .setmode = setmode,
260                 .data_hold = 1,
261                 .data_setup = 1,
262                 .clock_high = 1,
263                 .mode_hold = 1,
264                 .mode = 1,
265                 .mode_setup = 1,
266         },
267 };
268 
269 static int s3c24xx_uda134x_setup_pin(int pin, char *fun)
270 {
271         if (gpio_request(pin, "s3c24xx_uda134x") < 0) {
272                 printk(KERN_ERR "S3C24XX_UDA134X SoC Audio: "
273                        "l3 %s pin already in use", fun);
274                 return -EBUSY;
275         }
276         gpio_direction_output(pin, 0);
277         return 0;
278 }
279 
280 static int s3c24xx_uda134x_probe(struct platform_device *pdev)
281 {
282         int ret;
283 
284         printk(KERN_INFO "S3C24XX_UDA134X SoC Audio driver\n");
285 
286         s3c24xx_uda134x_l3_pins = pdev->dev.platform_data;
287         if (s3c24xx_uda134x_l3_pins == NULL) {
288                 printk(KERN_ERR "S3C24XX_UDA134X SoC Audio: "
289                        "unable to find platform data\n");
290                 return -ENODEV;
291         }
292         s3c24xx_uda134x.power = s3c24xx_uda134x_l3_pins->power;
293         s3c24xx_uda134x.model = s3c24xx_uda134x_l3_pins->model;
294 
295         if (s3c24xx_uda134x_setup_pin(s3c24xx_uda134x_l3_pins->l3_data,
296                                       "data") < 0)
297                 return -EBUSY;
298         if (s3c24xx_uda134x_setup_pin(s3c24xx_uda134x_l3_pins->l3_clk,
299                                       "clk") < 0) {
300                 gpio_free(s3c24xx_uda134x_l3_pins->l3_data);
301                 return -EBUSY;
302         }
303         if (s3c24xx_uda134x_setup_pin(s3c24xx_uda134x_l3_pins->l3_mode,
304                                       "mode") < 0) {
305                 gpio_free(s3c24xx_uda134x_l3_pins->l3_data);
306                 gpio_free(s3c24xx_uda134x_l3_pins->l3_clk);
307                 return -EBUSY;
308         }
309 
310         s3c24xx_uda134x_snd_device = platform_device_alloc("soc-audio", -1);
311         if (!s3c24xx_uda134x_snd_device) {
312                 printk(KERN_ERR "S3C24XX_UDA134X SoC Audio: "
313                        "Unable to register\n");
314                 return -ENOMEM;
315         }
316 
317         platform_set_drvdata(s3c24xx_uda134x_snd_device,
318                              &snd_soc_s3c24xx_uda134x);
319         platform_device_add_data(s3c24xx_uda134x_snd_device, &s3c24xx_uda134x, sizeof(s3c24xx_uda134x));
320         ret = platform_device_add(s3c24xx_uda134x_snd_device);
321         if (ret) {
322                 printk(KERN_ERR "S3C24XX_UDA134X SoC Audio: Unable to add\n");
323                 platform_device_put(s3c24xx_uda134x_snd_device);
324         }
325 
326         return ret;
327 }
328 
329 static int s3c24xx_uda134x_remove(struct platform_device *pdev)
330 {
331         platform_device_unregister(s3c24xx_uda134x_snd_device);
332         gpio_free(s3c24xx_uda134x_l3_pins->l3_data);
333         gpio_free(s3c24xx_uda134x_l3_pins->l3_clk);
334         gpio_free(s3c24xx_uda134x_l3_pins->l3_mode);
335         return 0;
336 }
337 
338 static struct platform_driver s3c24xx_uda134x_driver = {
339         .probe  = s3c24xx_uda134x_probe,
340         .remove = s3c24xx_uda134x_remove,
341         .driver = {
342                 .name = "s3c24xx_uda134x",
343                 .owner = THIS_MODULE,
344         },
345 };
346 
347 module_platform_driver(s3c24xx_uda134x_driver);
348 
349 MODULE_AUTHOR("Zoltan Devai, Christian Pellegrin <chripell@evolware.org>");
350 MODULE_DESCRIPTION("S3C24XX_UDA134X ALSA SoC audio driver");
351 MODULE_LICENSE("GPL");
352 

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