1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * AD193X Audio Codec driver supporting AD1936/7/8/9
4 *
5 * Copyright 2010 Analog Devices Inc.
6 */
7
8 #include <linux/module.h>
9 #include <linux/kernel.h>
10 #include <linux/device.h>
11 #include <linux/regmap.h>
12 #include <linux/slab.h>
13 #include <sound/core.h>
14 #include <sound/pcm.h>
15 #include <sound/pcm_params.h>
16 #include <sound/initval.h>
17 #include <sound/soc.h>
18 #include <sound/tlv.h>
19
20 #include "ad193x.h"
21
22 /* codec private data */
23 struct ad193x_priv {
24 struct regmap *regmap;
25 enum ad193x_type type;
26 int sysclk;
27 };
28
29 /*
30 * AD193X volume/mute/de-emphasis etc. controls
31 */
32 static const char * const ad193x_deemp[] = {"None", "48kHz", "44.1kHz", "32kHz"};
33
34 static SOC_ENUM_SINGLE_DECL(ad193x_deemp_enum, AD193X_DAC_CTRL2, 1,
35 ad193x_deemp);
36
37 static const DECLARE_TLV_DB_MINMAX(adau193x_tlv, -9563, 0);
38
39 static const unsigned int ad193x_sb[] = {32};
40
41 static struct snd_pcm_hw_constraint_list constr = {
42 .list = ad193x_sb,
43 .count = ARRAY_SIZE(ad193x_sb),
44 };
45
46 static const struct snd_kcontrol_new ad193x_snd_controls[] = {
47 /* DAC volume control */
48 SOC_DOUBLE_R_TLV("DAC1 Volume", AD193X_DAC_L1_VOL,
49 AD193X_DAC_R1_VOL, 0, 0xFF, 1, adau193x_tlv),
50 SOC_DOUBLE_R_TLV("DAC2 Volume", AD193X_DAC_L2_VOL,
51 AD193X_DAC_R2_VOL, 0, 0xFF, 1, adau193x_tlv),
52 SOC_DOUBLE_R_TLV("DAC3 Volume", AD193X_DAC_L3_VOL,
53 AD193X_DAC_R3_VOL, 0, 0xFF, 1, adau193x_tlv),
54 SOC_DOUBLE_R_TLV("DAC4 Volume", AD193X_DAC_L4_VOL,
55 AD193X_DAC_R4_VOL, 0, 0xFF, 1, adau193x_tlv),
56
57 /* DAC switch control */
58 SOC_DOUBLE("DAC1 Switch", AD193X_DAC_CHNL_MUTE, AD193X_DACL1_MUTE,
59 AD193X_DACR1_MUTE, 1, 1),
60 SOC_DOUBLE("DAC2 Switch", AD193X_DAC_CHNL_MUTE, AD193X_DACL2_MUTE,
61 AD193X_DACR2_MUTE, 1, 1),
62 SOC_DOUBLE("DAC3 Switch", AD193X_DAC_CHNL_MUTE, AD193X_DACL3_MUTE,
63 AD193X_DACR3_MUTE, 1, 1),
64 SOC_DOUBLE("DAC4 Switch", AD193X_DAC_CHNL_MUTE, AD193X_DACL4_MUTE,
65 AD193X_DACR4_MUTE, 1, 1),
66
67 /* DAC de-emphasis */
68 SOC_ENUM("Playback Deemphasis", ad193x_deemp_enum),
69 };
70
71 static const struct snd_kcontrol_new ad193x_adc_snd_controls[] = {
72 /* ADC switch control */
73 SOC_DOUBLE("ADC1 Switch", AD193X_ADC_CTRL0, AD193X_ADCL1_MUTE,
74 AD193X_ADCR1_MUTE, 1, 1),
75 SOC_DOUBLE("ADC2 Switch", AD193X_ADC_CTRL0, AD193X_ADCL2_MUTE,
76 AD193X_ADCR2_MUTE, 1, 1),
77
78 /* ADC high-pass filter */
79 SOC_SINGLE("ADC High Pass Filter Switch", AD193X_ADC_CTRL0,
80 AD193X_ADC_HIGHPASS_FILTER, 1, 0),
81 };
82
83 static const struct snd_soc_dapm_widget ad193x_dapm_widgets[] = {
84 SND_SOC_DAPM_DAC("DAC", "Playback", SND_SOC_NOPM, 0, 0),
85 SND_SOC_DAPM_PGA("DAC Output", AD193X_DAC_CTRL0, 0, 1, NULL, 0),
86 SND_SOC_DAPM_SUPPLY("PLL_PWR", AD193X_PLL_CLK_CTRL0, 0, 1, NULL, 0),
87 SND_SOC_DAPM_SUPPLY("SYSCLK", AD193X_PLL_CLK_CTRL0, 7, 0, NULL, 0),
88 SND_SOC_DAPM_VMID("VMID"),
89 SND_SOC_DAPM_OUTPUT("DAC1OUT"),
90 SND_SOC_DAPM_OUTPUT("DAC2OUT"),
91 SND_SOC_DAPM_OUTPUT("DAC3OUT"),
92 SND_SOC_DAPM_OUTPUT("DAC4OUT"),
93 };
94
95 static const struct snd_soc_dapm_widget ad193x_adc_widgets[] = {
96 SND_SOC_DAPM_ADC("ADC", "Capture", SND_SOC_NOPM, 0, 0),
97 SND_SOC_DAPM_SUPPLY("ADC_PWR", AD193X_ADC_CTRL0, 0, 1, NULL, 0),
98 SND_SOC_DAPM_INPUT("ADC1IN"),
99 SND_SOC_DAPM_INPUT("ADC2IN"),
100 };
101
102 static int ad193x_check_pll(struct snd_soc_dapm_widget *source,
103 struct snd_soc_dapm_widget *sink)
104 {
105 struct snd_soc_component *component = snd_soc_dapm_to_component(source->dapm);
106 struct ad193x_priv *ad193x = snd_soc_component_get_drvdata(component);
107
108 return !!ad193x->sysclk;
109 }
110
111 static const struct snd_soc_dapm_route audio_paths[] = {
112 { "DAC", NULL, "SYSCLK" },
113 { "DAC Output", NULL, "DAC" },
114 { "DAC Output", NULL, "VMID" },
115 { "DAC1OUT", NULL, "DAC Output" },
116 { "DAC2OUT", NULL, "DAC Output" },
117 { "DAC3OUT", NULL, "DAC Output" },
118 { "DAC4OUT", NULL, "DAC Output" },
119 { "SYSCLK", NULL, "PLL_PWR", &ad193x_check_pll },
120 };
121
122 static const struct snd_soc_dapm_route ad193x_adc_audio_paths[] = {
123 { "ADC", NULL, "SYSCLK" },
124 { "ADC", NULL, "ADC_PWR" },
125 { "ADC", NULL, "ADC1IN" },
126 { "ADC", NULL, "ADC2IN" },
127 };
128
129 static inline bool ad193x_has_adc(const struct ad193x_priv *ad193x)
130 {
131 switch (ad193x->type) {
132 case AD1933:
133 case AD1934:
134 return false;
135 default:
136 break;
137 }
138
139 return true;
140 }
141
142 /*
143 * DAI ops entries
144 */
145
146 static int ad193x_mute(struct snd_soc_dai *dai, int mute, int direction)
147 {
148 struct ad193x_priv *ad193x = snd_soc_component_get_drvdata(dai->component);
149
150 if (mute)
151 regmap_update_bits(ad193x->regmap, AD193X_DAC_CTRL2,
152 AD193X_DAC_MASTER_MUTE,
153 AD193X_DAC_MASTER_MUTE);
154 else
155 regmap_update_bits(ad193x->regmap, AD193X_DAC_CTRL2,
156 AD193X_DAC_MASTER_MUTE, 0);
157
158 return 0;
159 }
160
161 static int ad193x_set_tdm_slot(struct snd_soc_dai *dai, unsigned int tx_mask,
162 unsigned int rx_mask, int slots, int width)
163 {
164 struct ad193x_priv *ad193x = snd_soc_component_get_drvdata(dai->component);
165 unsigned int channels;
166
167 switch (slots) {
168 case 2:
169 channels = AD193X_2_CHANNELS;
170 break;
171 case 4:
172 channels = AD193X_4_CHANNELS;
173 break;
174 case 8:
175 channels = AD193X_8_CHANNELS;
176 break;
177 case 16:
178 channels = AD193X_16_CHANNELS;
179 break;
180 default:
181 return -EINVAL;
182 }
183
184 regmap_update_bits(ad193x->regmap, AD193X_DAC_CTRL1,
185 AD193X_DAC_CHAN_MASK, channels << AD193X_DAC_CHAN_SHFT);
186 if (ad193x_has_adc(ad193x))
187 regmap_update_bits(ad193x->regmap, AD193X_ADC_CTRL2,
188 AD193X_ADC_CHAN_MASK,
189 channels << AD193X_ADC_CHAN_SHFT);
190
191 return 0;
192 }
193
194 static int ad193x_set_dai_fmt(struct snd_soc_dai *codec_dai,
195 unsigned int fmt)
196 {
197 struct ad193x_priv *ad193x = snd_soc_component_get_drvdata(codec_dai->component);
198 unsigned int adc_serfmt = 0;
199 unsigned int dac_serfmt = 0;
200 unsigned int adc_fmt = 0;
201 unsigned int dac_fmt = 0;
202
203 /* At present, the driver only support AUX ADC mode(SND_SOC_DAIFMT_I2S
204 * with TDM), ADC&DAC TDM mode(SND_SOC_DAIFMT_DSP_A) and DAC I2S mode
205 * (SND_SOC_DAIFMT_I2S)
206 */
207 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
208 case SND_SOC_DAIFMT_I2S:
209 adc_serfmt |= AD193X_ADC_SERFMT_TDM;
210 dac_serfmt |= AD193X_DAC_SERFMT_STEREO;
211 break;
212 case SND_SOC_DAIFMT_DSP_A:
213 adc_serfmt |= AD193X_ADC_SERFMT_AUX;
214 dac_serfmt |= AD193X_DAC_SERFMT_TDM;
215 break;
216 default:
217 if (ad193x_has_adc(ad193x))
218 return -EINVAL;
219 }
220
221 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
222 case SND_SOC_DAIFMT_NB_NF: /* normal bit clock + frame */
223 break;
224 case SND_SOC_DAIFMT_NB_IF: /* normal bclk + invert frm */
225 adc_fmt |= AD193X_ADC_LEFT_HIGH;
226 dac_fmt |= AD193X_DAC_LEFT_HIGH;
227 break;
228 case SND_SOC_DAIFMT_IB_NF: /* invert bclk + normal frm */
229 adc_fmt |= AD193X_ADC_BCLK_INV;
230 dac_fmt |= AD193X_DAC_BCLK_INV;
231 break;
232 case SND_SOC_DAIFMT_IB_IF: /* invert bclk + frm */
233 adc_fmt |= AD193X_ADC_LEFT_HIGH;
234 adc_fmt |= AD193X_ADC_BCLK_INV;
235 dac_fmt |= AD193X_DAC_LEFT_HIGH;
236 dac_fmt |= AD193X_DAC_BCLK_INV;
237 break;
238 default:
239 return -EINVAL;
240 }
241
242 /* For DSP_*, LRCLK's polarity must be inverted */
243 if (fmt & SND_SOC_DAIFMT_DSP_A)
244 dac_fmt ^= AD193X_DAC_LEFT_HIGH;
245
246 switch (fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) {
247 case SND_SOC_DAIFMT_CBP_CFP:
248 adc_fmt |= AD193X_ADC_LCR_MASTER;
249 adc_fmt |= AD193X_ADC_BCLK_MASTER;
250 dac_fmt |= AD193X_DAC_LCR_MASTER;
251 dac_fmt |= AD193X_DAC_BCLK_MASTER;
252 break;
253 case SND_SOC_DAIFMT_CBC_CFP:
254 adc_fmt |= AD193X_ADC_LCR_MASTER;
255 dac_fmt |= AD193X_DAC_LCR_MASTER;
256 break;
257 case SND_SOC_DAIFMT_CBP_CFC:
258 adc_fmt |= AD193X_ADC_BCLK_MASTER;
259 dac_fmt |= AD193X_DAC_BCLK_MASTER;
260 break;
261 case SND_SOC_DAIFMT_CBC_CFC:
262 break;
263 default:
264 return -EINVAL;
265 }
266
267 if (ad193x_has_adc(ad193x)) {
268 regmap_update_bits(ad193x->regmap, AD193X_ADC_CTRL1,
269 AD193X_ADC_SERFMT_MASK, adc_serfmt);
270 regmap_update_bits(ad193x->regmap, AD193X_ADC_CTRL2,
271 AD193X_ADC_FMT_MASK, adc_fmt);
272 }
273 regmap_update_bits(ad193x->regmap, AD193X_DAC_CTRL0,
274 AD193X_DAC_SERFMT_MASK, dac_serfmt);
275 regmap_update_bits(ad193x->regmap, AD193X_DAC_CTRL1,
276 AD193X_DAC_FMT_MASK, dac_fmt);
277
278 return 0;
279 }
280
281 static int ad193x_set_dai_sysclk(struct snd_soc_dai *codec_dai,
282 int clk_id, unsigned int freq, int dir)
283 {
284 struct snd_soc_component *component = codec_dai->component;
285 struct snd_soc_dapm_context *dapm = snd_soc_component_get_dapm(component);
286 struct ad193x_priv *ad193x = snd_soc_component_get_drvdata(component);
287
288 if (clk_id == AD193X_SYSCLK_MCLK) {
289 /* MCLK must be 512 x fs */
290 if (dir == SND_SOC_CLOCK_OUT || freq != 24576000)
291 return -EINVAL;
292
293 regmap_update_bits(ad193x->regmap, AD193X_PLL_CLK_CTRL1,
294 AD193X_PLL_SRC_MASK,
295 AD193X_PLL_DAC_SRC_MCLK |
296 AD193X_PLL_CLK_SRC_MCLK);
297
298 snd_soc_dapm_sync(dapm);
299 return 0;
300 }
301 switch (freq) {
302 case 12288000:
303 case 18432000:
304 case 24576000:
305 case 36864000:
306 ad193x->sysclk = freq;
307 return 0;
308 }
309 return -EINVAL;
310 }
311
312 static int ad193x_hw_params(struct snd_pcm_substream *substream,
313 struct snd_pcm_hw_params *params,
314 struct snd_soc_dai *dai)
315 {
316 int word_len = 0, master_rate = 0;
317 struct snd_soc_component *component = dai->component;
318 struct ad193x_priv *ad193x = snd_soc_component_get_drvdata(component);
319 bool is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
320 u8 dacc0;
321
322 dev_dbg(dai->dev, "%s() rate=%u format=%#x width=%u channels=%u\n",
323 __func__, params_rate(params), params_format(params),
324 params_width(params), params_channels(params));
325
326
327 /* bit size */
328 switch (params_width(params)) {
329 case 16:
330 word_len = 3;
331 break;
332 case 20:
333 word_len = 1;
334 break;
335 case 24:
336 case 32:
337 word_len = 0;
338 break;
339 }
340
341 switch (ad193x->sysclk) {
342 case 12288000:
343 master_rate = AD193X_PLL_INPUT_256;
344 break;
345 case 18432000:
346 master_rate = AD193X_PLL_INPUT_384;
347 break;
348 case 24576000:
349 master_rate = AD193X_PLL_INPUT_512;
350 break;
351 case 36864000:
352 master_rate = AD193X_PLL_INPUT_768;
353 break;
354 }
355
356 if (is_playback) {
357 switch (params_rate(params)) {
358 case 48000:
359 dacc0 = AD193X_DAC_SR_48;
360 break;
361 case 96000:
362 dacc0 = AD193X_DAC_SR_96;
363 break;
364 case 192000:
365 dacc0 = AD193X_DAC_SR_192;
366 break;
367 default:
368 dev_err(dai->dev, "invalid sampling rate: %d\n", params_rate(params));
369 return -EINVAL;
370 }
371
372 regmap_update_bits(ad193x->regmap, AD193X_DAC_CTRL0, AD193X_DAC_SR_MASK, dacc0);
373 }
374
375 regmap_update_bits(ad193x->regmap, AD193X_PLL_CLK_CTRL0,
376 AD193X_PLL_INPUT_MASK, master_rate);
377
378 regmap_update_bits(ad193x->regmap, AD193X_DAC_CTRL2,
379 AD193X_DAC_WORD_LEN_MASK,
380 word_len << AD193X_DAC_WORD_LEN_SHFT);
381
382 if (ad193x_has_adc(ad193x))
383 regmap_update_bits(ad193x->regmap, AD193X_ADC_CTRL1,
384 AD193X_ADC_WORD_LEN_MASK, word_len);
385
386 return 0;
387 }
388
389 static int ad193x_startup(struct snd_pcm_substream *substream,
390 struct snd_soc_dai *dai)
391 {
392 return snd_pcm_hw_constraint_list(substream->runtime, 0,
393 SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
394 &constr);
395 }
396
397 static const struct snd_soc_dai_ops ad193x_dai_ops = {
398 .startup = ad193x_startup,
399 .hw_params = ad193x_hw_params,
400 .mute_stream = ad193x_mute,
401 .set_tdm_slot = ad193x_set_tdm_slot,
402 .set_sysclk = ad193x_set_dai_sysclk,
403 .set_fmt = ad193x_set_dai_fmt,
404 .no_capture_mute = 1,
405 };
406
407 /* codec DAI instance */
408 static struct snd_soc_dai_driver ad193x_dai = {
409 .name = "ad193x-hifi",
410 .playback = {
411 .stream_name = "Playback",
412 .channels_min = 2,
413 .channels_max = 8,
414 .rates = SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_192000,
415 .formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S16_LE |
416 SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S24_LE,
417 },
418 .capture = {
419 .stream_name = "Capture",
420 .channels_min = 2,
421 .channels_max = 4,
422 .rates = SNDRV_PCM_RATE_48000,
423 .formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S16_LE |
424 SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S24_LE,
425 },
426 .ops = &ad193x_dai_ops,
427 };
428
429 /* codec DAI instance for DAC only */
430 static struct snd_soc_dai_driver ad193x_no_adc_dai = {
431 .name = "ad193x-hifi",
432 .playback = {
433 .stream_name = "Playback",
434 .channels_min = 2,
435 .channels_max = 8,
436 .rates = SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_192000,
437 .formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S16_LE |
438 SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S24_LE,
439 },
440 .ops = &ad193x_dai_ops,
441 };
442
443 /* codec register values to set after reset */
444 static void ad193x_reg_default_init(struct ad193x_priv *ad193x)
445 {
446 static const struct reg_sequence reg_init[] = {
447 { 0, 0x99 }, /* PLL_CLK_CTRL0: pll input: mclki/xi 12.288Mhz */
448 { 1, 0x04 }, /* PLL_CLK_CTRL1: no on-chip Vref */
449 { 2, 0x40 }, /* DAC_CTRL0: TDM mode */
450 { 3, 0x00 }, /* DAC_CTRL1: reset */
451 { 4, 0x1A }, /* DAC_CTRL2: 48kHz de-emphasis, unmute dac */
452 { 5, 0x00 }, /* DAC_CHNL_MUTE: unmute DAC channels */
453 { 6, 0x00 }, /* DAC_L1_VOL: no attenuation */
454 { 7, 0x00 }, /* DAC_R1_VOL: no attenuation */
455 { 8, 0x00 }, /* DAC_L2_VOL: no attenuation */
456 { 9, 0x00 }, /* DAC_R2_VOL: no attenuation */
457 { 10, 0x00 }, /* DAC_L3_VOL: no attenuation */
458 { 11, 0x00 }, /* DAC_R3_VOL: no attenuation */
459 { 12, 0x00 }, /* DAC_L4_VOL: no attenuation */
460 { 13, 0x00 }, /* DAC_R4_VOL: no attenuation */
461 };
462 static const struct reg_sequence reg_adc_init[] = {
463 { 14, 0x03 }, /* ADC_CTRL0: high-pass filter enable */
464 { 15, 0x43 }, /* ADC_CTRL1: sata delay=1, adc aux mode */
465 { 16, 0x00 }, /* ADC_CTRL2: reset */
466 };
467
468 regmap_multi_reg_write(ad193x->regmap, reg_init, ARRAY_SIZE(reg_init));
469
470 if (ad193x_has_adc(ad193x)) {
471 regmap_multi_reg_write(ad193x->regmap, reg_adc_init,
472 ARRAY_SIZE(reg_adc_init));
473 }
474 }
475
476 static int ad193x_component_probe(struct snd_soc_component *component)
477 {
478 struct ad193x_priv *ad193x = snd_soc_component_get_drvdata(component);
479 struct snd_soc_dapm_context *dapm = snd_soc_component_get_dapm(component);
480 int num, ret;
481
482 /* default setting for ad193x */
483 ad193x_reg_default_init(ad193x);
484
485 /* adc only */
486 if (ad193x_has_adc(ad193x)) {
487 /* add adc controls */
488 num = ARRAY_SIZE(ad193x_adc_snd_controls);
489 ret = snd_soc_add_component_controls(component,
490 ad193x_adc_snd_controls,
491 num);
492 if (ret)
493 return ret;
494
495 /* add adc widgets */
496 num = ARRAY_SIZE(ad193x_adc_widgets);
497 ret = snd_soc_dapm_new_controls(dapm,
498 ad193x_adc_widgets,
499 num);
500 if (ret)
501 return ret;
502
503 /* add adc routes */
504 num = ARRAY_SIZE(ad193x_adc_audio_paths);
505 ret = snd_soc_dapm_add_routes(dapm,
506 ad193x_adc_audio_paths,
507 num);
508 if (ret)
509 return ret;
510 }
511
512 return 0;
513 }
514
515 static const struct snd_soc_component_driver soc_component_dev_ad193x = {
516 .probe = ad193x_component_probe,
517 .controls = ad193x_snd_controls,
518 .num_controls = ARRAY_SIZE(ad193x_snd_controls),
519 .dapm_widgets = ad193x_dapm_widgets,
520 .num_dapm_widgets = ARRAY_SIZE(ad193x_dapm_widgets),
521 .dapm_routes = audio_paths,
522 .num_dapm_routes = ARRAY_SIZE(audio_paths),
523 .idle_bias_on = 1,
524 .use_pmdown_time = 1,
525 .endianness = 1,
526 };
527
528 const struct regmap_config ad193x_regmap_config = {
529 .max_register = AD193X_NUM_REGS - 1,
530 };
531 EXPORT_SYMBOL_GPL(ad193x_regmap_config);
532
533 int ad193x_probe(struct device *dev, struct regmap *regmap,
534 enum ad193x_type type)
535 {
536 struct ad193x_priv *ad193x;
537
538 if (IS_ERR(regmap))
539 return PTR_ERR(regmap);
540
541 ad193x = devm_kzalloc(dev, sizeof(*ad193x), GFP_KERNEL);
542 if (ad193x == NULL)
543 return -ENOMEM;
544
545 ad193x->regmap = regmap;
546 ad193x->type = type;
547
548 dev_set_drvdata(dev, ad193x);
549
550 if (ad193x_has_adc(ad193x))
551 return devm_snd_soc_register_component(dev, &soc_component_dev_ad193x,
552 &ad193x_dai, 1);
553 return devm_snd_soc_register_component(dev, &soc_component_dev_ad193x,
554 &ad193x_no_adc_dai, 1);
555 }
556 EXPORT_SYMBOL_GPL(ad193x_probe);
557
558 MODULE_DESCRIPTION("ASoC ad193x driver");
559 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
560 MODULE_LICENSE("GPL");
561
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.