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357a1db9 JB |
1 | /* sound/soc/s3c24xx/s3c-pcm.c |
2 | * | |
3 | * ALSA SoC Audio Layer - S3C PCM-Controller driver | |
4 | * | |
5 | * Copyright (c) 2009 Samsung Electronics Co. Ltd | |
6 | * Author: Jaswinder Singh <jassi.brar@samsung.com> | |
7 | * based upon I2S drivers by Ben Dooks. | |
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/init.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/device.h> | |
17 | #include <linux/delay.h> | |
18 | #include <linux/clk.h> | |
19 | #include <linux/kernel.h> | |
20 | #include <linux/gpio.h> | |
21 | #include <linux/io.h> | |
22 | ||
23 | #include <sound/core.h> | |
24 | #include <sound/pcm.h> | |
25 | #include <sound/pcm_params.h> | |
26 | #include <sound/initval.h> | |
27 | #include <sound/soc.h> | |
28 | ||
29 | #include <plat/audio.h> | |
30 | #include <plat/dma.h> | |
31 | ||
32 | #include "s3c-dma.h" | |
33 | #include "s3c-pcm.h" | |
34 | ||
35 | static struct s3c2410_dma_client s3c_pcm_dma_client_out = { | |
36 | .name = "PCM Stereo out" | |
37 | }; | |
38 | ||
39 | static struct s3c2410_dma_client s3c_pcm_dma_client_in = { | |
40 | .name = "PCM Stereo in" | |
41 | }; | |
42 | ||
43 | static struct s3c_dma_params s3c_pcm_stereo_out[] = { | |
44 | [0] = { | |
45 | .client = &s3c_pcm_dma_client_out, | |
46 | .dma_size = 4, | |
47 | }, | |
48 | [1] = { | |
49 | .client = &s3c_pcm_dma_client_out, | |
50 | .dma_size = 4, | |
51 | }, | |
52 | }; | |
53 | ||
54 | static struct s3c_dma_params s3c_pcm_stereo_in[] = { | |
55 | [0] = { | |
56 | .client = &s3c_pcm_dma_client_in, | |
57 | .dma_size = 4, | |
58 | }, | |
59 | [1] = { | |
60 | .client = &s3c_pcm_dma_client_in, | |
61 | .dma_size = 4, | |
62 | }, | |
63 | }; | |
64 | ||
65 | static struct s3c_pcm_info s3c_pcm[2]; | |
66 | ||
67 | static inline struct s3c_pcm_info *to_info(struct snd_soc_dai *cpu_dai) | |
68 | { | |
69 | return cpu_dai->private_data; | |
70 | } | |
71 | ||
72 | static void s3c_pcm_snd_txctrl(struct s3c_pcm_info *pcm, int on) | |
73 | { | |
74 | void __iomem *regs = pcm->regs; | |
75 | u32 ctl, clkctl; | |
76 | ||
77 | clkctl = readl(regs + S3C_PCM_CLKCTL); | |
78 | ctl = readl(regs + S3C_PCM_CTL); | |
79 | ctl &= ~(S3C_PCM_CTL_TXDIPSTICK_MASK | |
80 | << S3C_PCM_CTL_TXDIPSTICK_SHIFT); | |
81 | ||
82 | if (on) { | |
83 | ctl |= S3C_PCM_CTL_TXDMA_EN; | |
84 | ctl |= S3C_PCM_CTL_TXFIFO_EN; | |
85 | ctl |= S3C_PCM_CTL_ENABLE; | |
86 | ctl |= (0x20<<S3C_PCM_CTL_TXDIPSTICK_SHIFT); | |
87 | clkctl |= S3C_PCM_CLKCTL_SERCLK_EN; | |
88 | } else { | |
89 | ctl &= ~S3C_PCM_CTL_TXDMA_EN; | |
90 | ctl &= ~S3C_PCM_CTL_TXFIFO_EN; | |
91 | ||
92 | if (!(ctl & S3C_PCM_CTL_RXFIFO_EN)) { | |
93 | ctl &= ~S3C_PCM_CTL_ENABLE; | |
94 | if (!pcm->idleclk) | |
95 | clkctl |= S3C_PCM_CLKCTL_SERCLK_EN; | |
96 | } | |
97 | } | |
98 | ||
99 | writel(clkctl, regs + S3C_PCM_CLKCTL); | |
100 | writel(ctl, regs + S3C_PCM_CTL); | |
101 | } | |
102 | ||
103 | static void s3c_pcm_snd_rxctrl(struct s3c_pcm_info *pcm, int on) | |
104 | { | |
105 | void __iomem *regs = pcm->regs; | |
106 | u32 ctl, clkctl; | |
107 | ||
108 | ctl = readl(regs + S3C_PCM_CTL); | |
109 | clkctl = readl(regs + S3C_PCM_CLKCTL); | |
110 | ||
111 | if (on) { | |
112 | ctl |= S3C_PCM_CTL_RXDMA_EN; | |
113 | ctl |= S3C_PCM_CTL_RXFIFO_EN; | |
114 | ctl |= S3C_PCM_CTL_ENABLE; | |
115 | clkctl |= S3C_PCM_CLKCTL_SERCLK_EN; | |
116 | } else { | |
117 | ctl &= ~S3C_PCM_CTL_RXDMA_EN; | |
118 | ctl &= ~S3C_PCM_CTL_RXFIFO_EN; | |
119 | ||
120 | if (!(ctl & S3C_PCM_CTL_TXFIFO_EN)) { | |
121 | ctl &= ~S3C_PCM_CTL_ENABLE; | |
122 | if (!pcm->idleclk) | |
123 | clkctl |= S3C_PCM_CLKCTL_SERCLK_EN; | |
124 | } | |
125 | } | |
126 | ||
127 | writel(clkctl, regs + S3C_PCM_CLKCTL); | |
128 | writel(ctl, regs + S3C_PCM_CTL); | |
129 | } | |
130 | ||
131 | static int s3c_pcm_trigger(struct snd_pcm_substream *substream, int cmd, | |
132 | struct snd_soc_dai *dai) | |
133 | { | |
134 | struct snd_soc_pcm_runtime *rtd = substream->private_data; | |
135 | struct s3c_pcm_info *pcm = to_info(rtd->dai->cpu_dai); | |
136 | unsigned long flags; | |
137 | ||
138 | dev_dbg(pcm->dev, "Entered %s\n", __func__); | |
139 | ||
140 | switch (cmd) { | |
141 | case SNDRV_PCM_TRIGGER_START: | |
142 | case SNDRV_PCM_TRIGGER_RESUME: | |
143 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: | |
144 | spin_lock_irqsave(&pcm->lock, flags); | |
145 | ||
146 | if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) | |
147 | s3c_pcm_snd_rxctrl(pcm, 1); | |
148 | else | |
149 | s3c_pcm_snd_txctrl(pcm, 1); | |
150 | ||
151 | spin_unlock_irqrestore(&pcm->lock, flags); | |
152 | break; | |
153 | ||
154 | case SNDRV_PCM_TRIGGER_STOP: | |
155 | case SNDRV_PCM_TRIGGER_SUSPEND: | |
156 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: | |
157 | spin_lock_irqsave(&pcm->lock, flags); | |
158 | ||
159 | if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) | |
160 | s3c_pcm_snd_rxctrl(pcm, 0); | |
161 | else | |
162 | s3c_pcm_snd_txctrl(pcm, 0); | |
163 | ||
164 | spin_unlock_irqrestore(&pcm->lock, flags); | |
165 | break; | |
166 | ||
167 | default: | |
168 | return -EINVAL; | |
169 | } | |
170 | ||
171 | return 0; | |
172 | } | |
173 | ||
174 | static int s3c_pcm_hw_params(struct snd_pcm_substream *substream, | |
175 | struct snd_pcm_hw_params *params, | |
176 | struct snd_soc_dai *socdai) | |
177 | { | |
178 | struct snd_soc_pcm_runtime *rtd = substream->private_data; | |
179 | struct snd_soc_dai_link *dai = rtd->dai; | |
180 | struct s3c_pcm_info *pcm = to_info(dai->cpu_dai); | |
181 | void __iomem *regs = pcm->regs; | |
182 | struct clk *clk; | |
183 | int sclk_div, sync_div; | |
184 | unsigned long flags; | |
185 | u32 clkctl; | |
186 | ||
187 | dev_dbg(pcm->dev, "Entered %s\n", __func__); | |
188 | ||
189 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) | |
190 | dai->cpu_dai->dma_data = pcm->dma_playback; | |
191 | else | |
192 | dai->cpu_dai->dma_data = pcm->dma_capture; | |
193 | ||
194 | /* Strictly check for sample size */ | |
195 | switch (params_format(params)) { | |
196 | case SNDRV_PCM_FORMAT_S16_LE: | |
197 | break; | |
198 | default: | |
199 | return -EINVAL; | |
200 | } | |
201 | ||
202 | spin_lock_irqsave(&pcm->lock, flags); | |
203 | ||
204 | /* Get hold of the PCMSOURCE_CLK */ | |
205 | clkctl = readl(regs + S3C_PCM_CLKCTL); | |
206 | if (clkctl & S3C_PCM_CLKCTL_SERCLKSEL_PCLK) | |
207 | clk = pcm->pclk; | |
208 | else | |
209 | clk = pcm->cclk; | |
210 | ||
211 | /* Set the SCLK divider */ | |
212 | sclk_div = clk_get_rate(clk) / pcm->sclk_per_fs / | |
213 | params_rate(params) / 2 - 1; | |
214 | ||
215 | clkctl &= ~(S3C_PCM_CLKCTL_SCLKDIV_MASK | |
216 | << S3C_PCM_CLKCTL_SCLKDIV_SHIFT); | |
217 | clkctl |= ((sclk_div & S3C_PCM_CLKCTL_SCLKDIV_MASK) | |
218 | << S3C_PCM_CLKCTL_SCLKDIV_SHIFT); | |
219 | ||
220 | /* Set the SYNC divider */ | |
221 | sync_div = pcm->sclk_per_fs - 1; | |
222 | ||
223 | clkctl &= ~(S3C_PCM_CLKCTL_SYNCDIV_MASK | |
224 | << S3C_PCM_CLKCTL_SYNCDIV_SHIFT); | |
225 | clkctl |= ((sync_div & S3C_PCM_CLKCTL_SYNCDIV_MASK) | |
226 | << S3C_PCM_CLKCTL_SYNCDIV_SHIFT); | |
227 | ||
228 | writel(clkctl, regs + S3C_PCM_CLKCTL); | |
229 | ||
230 | spin_unlock_irqrestore(&pcm->lock, flags); | |
231 | ||
232 | dev_dbg(pcm->dev, "PCMSOURCE_CLK-%lu SCLK=%ufs \ | |
233 | SCLK_DIV=%d SYNC_DIV=%d\n", | |
234 | clk_get_rate(clk), pcm->sclk_per_fs, | |
235 | sclk_div, sync_div); | |
236 | ||
237 | return 0; | |
238 | } | |
239 | ||
240 | static int s3c_pcm_set_fmt(struct snd_soc_dai *cpu_dai, | |
241 | unsigned int fmt) | |
242 | { | |
243 | struct s3c_pcm_info *pcm = to_info(cpu_dai); | |
244 | void __iomem *regs = pcm->regs; | |
245 | unsigned long flags; | |
246 | int ret = 0; | |
247 | u32 ctl; | |
248 | ||
249 | dev_dbg(pcm->dev, "Entered %s\n", __func__); | |
250 | ||
251 | spin_lock_irqsave(&pcm->lock, flags); | |
252 | ||
253 | ctl = readl(regs + S3C_PCM_CTL); | |
254 | ||
255 | switch (fmt & SND_SOC_DAIFMT_INV_MASK) { | |
256 | case SND_SOC_DAIFMT_NB_NF: | |
257 | /* Nothing to do, NB_NF by default */ | |
258 | break; | |
259 | default: | |
260 | dev_err(pcm->dev, "Unsupported clock inversion!\n"); | |
261 | ret = -EINVAL; | |
262 | goto exit; | |
263 | } | |
264 | ||
265 | switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { | |
266 | case SND_SOC_DAIFMT_CBS_CFS: | |
267 | /* Nothing to do, Master by default */ | |
268 | break; | |
269 | default: | |
270 | dev_err(pcm->dev, "Unsupported master/slave format!\n"); | |
271 | ret = -EINVAL; | |
272 | goto exit; | |
273 | } | |
274 | ||
275 | switch (fmt & SND_SOC_DAIFMT_CLOCK_MASK) { | |
276 | case SND_SOC_DAIFMT_CONT: | |
277 | pcm->idleclk = 1; | |
278 | break; | |
279 | case SND_SOC_DAIFMT_GATED: | |
280 | pcm->idleclk = 0; | |
281 | break; | |
282 | default: | |
283 | dev_err(pcm->dev, "Invalid Clock gating request!\n"); | |
284 | ret = -EINVAL; | |
285 | goto exit; | |
286 | } | |
287 | ||
288 | switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { | |
289 | case SND_SOC_DAIFMT_DSP_A: | |
290 | ctl |= S3C_PCM_CTL_TXMSB_AFTER_FSYNC; | |
291 | ctl |= S3C_PCM_CTL_RXMSB_AFTER_FSYNC; | |
292 | break; | |
293 | case SND_SOC_DAIFMT_DSP_B: | |
294 | ctl &= ~S3C_PCM_CTL_TXMSB_AFTER_FSYNC; | |
295 | ctl &= ~S3C_PCM_CTL_RXMSB_AFTER_FSYNC; | |
296 | break; | |
297 | default: | |
298 | dev_err(pcm->dev, "Unsupported data format!\n"); | |
299 | ret = -EINVAL; | |
300 | goto exit; | |
301 | } | |
302 | ||
303 | writel(ctl, regs + S3C_PCM_CTL); | |
304 | ||
305 | exit: | |
306 | spin_unlock_irqrestore(&pcm->lock, flags); | |
307 | ||
308 | return ret; | |
309 | } | |
310 | ||
311 | static int s3c_pcm_set_clkdiv(struct snd_soc_dai *cpu_dai, | |
312 | int div_id, int div) | |
313 | { | |
314 | struct s3c_pcm_info *pcm = to_info(cpu_dai); | |
315 | ||
316 | switch (div_id) { | |
317 | case S3C_PCM_SCLK_PER_FS: | |
318 | pcm->sclk_per_fs = div; | |
319 | break; | |
320 | ||
321 | default: | |
322 | return -EINVAL; | |
323 | } | |
324 | ||
325 | return 0; | |
326 | } | |
327 | ||
328 | static int s3c_pcm_set_sysclk(struct snd_soc_dai *cpu_dai, | |
329 | int clk_id, unsigned int freq, int dir) | |
330 | { | |
331 | struct s3c_pcm_info *pcm = to_info(cpu_dai); | |
332 | void __iomem *regs = pcm->regs; | |
333 | u32 clkctl = readl(regs + S3C_PCM_CLKCTL); | |
334 | ||
335 | switch (clk_id) { | |
336 | case S3C_PCM_CLKSRC_PCLK: | |
337 | clkctl |= S3C_PCM_CLKCTL_SERCLKSEL_PCLK; | |
338 | break; | |
339 | ||
340 | case S3C_PCM_CLKSRC_MUX: | |
341 | clkctl &= ~S3C_PCM_CLKCTL_SERCLKSEL_PCLK; | |
342 | ||
343 | if (clk_get_rate(pcm->cclk) != freq) | |
344 | clk_set_rate(pcm->cclk, freq); | |
345 | ||
346 | break; | |
347 | ||
348 | default: | |
349 | return -EINVAL; | |
350 | } | |
351 | ||
352 | writel(clkctl, regs + S3C_PCM_CLKCTL); | |
353 | ||
354 | return 0; | |
355 | } | |
356 | ||
357 | static struct snd_soc_dai_ops s3c_pcm_dai_ops = { | |
358 | .set_sysclk = s3c_pcm_set_sysclk, | |
359 | .set_clkdiv = s3c_pcm_set_clkdiv, | |
360 | .trigger = s3c_pcm_trigger, | |
361 | .hw_params = s3c_pcm_hw_params, | |
362 | .set_fmt = s3c_pcm_set_fmt, | |
363 | }; | |
364 | ||
365 | #define S3C_PCM_RATES SNDRV_PCM_RATE_8000_96000 | |
366 | ||
367 | #define S3C_PCM_DECLARE(n) \ | |
368 | { \ | |
369 | .name = "samsung-pcm", \ | |
370 | .id = (n), \ | |
371 | .symmetric_rates = 1, \ | |
372 | .ops = &s3c_pcm_dai_ops, \ | |
373 | .playback = { \ | |
374 | .channels_min = 2, \ | |
375 | .channels_max = 2, \ | |
376 | .rates = S3C_PCM_RATES, \ | |
377 | .formats = SNDRV_PCM_FMTBIT_S16_LE, \ | |
378 | }, \ | |
379 | .capture = { \ | |
380 | .channels_min = 2, \ | |
381 | .channels_max = 2, \ | |
382 | .rates = S3C_PCM_RATES, \ | |
383 | .formats = SNDRV_PCM_FMTBIT_S16_LE, \ | |
384 | }, \ | |
385 | } | |
386 | ||
387 | struct snd_soc_dai s3c_pcm_dai[] = { | |
388 | S3C_PCM_DECLARE(0), | |
389 | S3C_PCM_DECLARE(1), | |
390 | }; | |
391 | EXPORT_SYMBOL_GPL(s3c_pcm_dai); | |
392 | ||
393 | static __devinit int s3c_pcm_dev_probe(struct platform_device *pdev) | |
394 | { | |
395 | struct s3c_pcm_info *pcm; | |
396 | struct snd_soc_dai *dai; | |
397 | struct resource *mem_res, *dmatx_res, *dmarx_res; | |
398 | struct s3c_audio_pdata *pcm_pdata; | |
399 | int ret; | |
400 | ||
401 | /* Check for valid device index */ | |
402 | if ((pdev->id < 0) || pdev->id >= ARRAY_SIZE(s3c_pcm)) { | |
403 | dev_err(&pdev->dev, "id %d out of range\n", pdev->id); | |
404 | return -EINVAL; | |
405 | } | |
406 | ||
407 | pcm_pdata = pdev->dev.platform_data; | |
408 | ||
409 | /* Check for availability of necessary resource */ | |
410 | dmatx_res = platform_get_resource(pdev, IORESOURCE_DMA, 0); | |
411 | if (!dmatx_res) { | |
412 | dev_err(&pdev->dev, "Unable to get PCM-TX dma resource\n"); | |
413 | return -ENXIO; | |
414 | } | |
415 | ||
416 | dmarx_res = platform_get_resource(pdev, IORESOURCE_DMA, 1); | |
417 | if (!dmarx_res) { | |
418 | dev_err(&pdev->dev, "Unable to get PCM-RX dma resource\n"); | |
419 | return -ENXIO; | |
420 | } | |
421 | ||
422 | mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
423 | if (!mem_res) { | |
424 | dev_err(&pdev->dev, "Unable to get register resource\n"); | |
425 | return -ENXIO; | |
426 | } | |
427 | ||
428 | if (pcm_pdata && pcm_pdata->cfg_gpio && pcm_pdata->cfg_gpio(pdev)) { | |
429 | dev_err(&pdev->dev, "Unable to configure gpio\n"); | |
430 | return -EINVAL; | |
431 | } | |
432 | ||
433 | pcm = &s3c_pcm[pdev->id]; | |
434 | pcm->dev = &pdev->dev; | |
435 | ||
436 | spin_lock_init(&pcm->lock); | |
437 | ||
438 | dai = &s3c_pcm_dai[pdev->id]; | |
439 | dai->dev = &pdev->dev; | |
440 | ||
441 | /* Default is 128fs */ | |
442 | pcm->sclk_per_fs = 128; | |
443 | ||
444 | pcm->cclk = clk_get(&pdev->dev, "audio-bus"); | |
445 | if (IS_ERR(pcm->cclk)) { | |
446 | dev_err(&pdev->dev, "failed to get audio-bus\n"); | |
447 | ret = PTR_ERR(pcm->cclk); | |
448 | goto err1; | |
449 | } | |
450 | clk_enable(pcm->cclk); | |
451 | ||
452 | /* record our pcm structure for later use in the callbacks */ | |
453 | dai->private_data = pcm; | |
454 | ||
455 | if (!request_mem_region(mem_res->start, | |
456 | resource_size(mem_res), "samsung-pcm")) { | |
457 | dev_err(&pdev->dev, "Unable to request register region\n"); | |
458 | ret = -EBUSY; | |
459 | goto err2; | |
460 | } | |
461 | ||
462 | pcm->regs = ioremap(mem_res->start, 0x100); | |
463 | if (pcm->regs == NULL) { | |
464 | dev_err(&pdev->dev, "cannot ioremap registers\n"); | |
465 | ret = -ENXIO; | |
466 | goto err3; | |
467 | } | |
468 | ||
469 | pcm->pclk = clk_get(&pdev->dev, "pcm"); | |
470 | if (IS_ERR(pcm->pclk)) { | |
471 | dev_err(&pdev->dev, "failed to get pcm_clock\n"); | |
472 | ret = -ENOENT; | |
473 | goto err4; | |
474 | } | |
475 | clk_enable(pcm->pclk); | |
476 | ||
477 | ret = snd_soc_register_dai(dai); | |
478 | if (ret != 0) { | |
479 | dev_err(&pdev->dev, "failed to get pcm_clock\n"); | |
480 | goto err5; | |
481 | } | |
482 | ||
483 | s3c_pcm_stereo_in[pdev->id].dma_addr = mem_res->start | |
484 | + S3C_PCM_RXFIFO; | |
485 | s3c_pcm_stereo_out[pdev->id].dma_addr = mem_res->start | |
486 | + S3C_PCM_TXFIFO; | |
487 | ||
488 | s3c_pcm_stereo_in[pdev->id].channel = dmarx_res->start; | |
489 | s3c_pcm_stereo_out[pdev->id].channel = dmatx_res->start; | |
490 | ||
491 | pcm->dma_capture = &s3c_pcm_stereo_in[pdev->id]; | |
492 | pcm->dma_playback = &s3c_pcm_stereo_out[pdev->id]; | |
493 | ||
494 | return 0; | |
495 | ||
496 | err5: | |
497 | clk_disable(pcm->pclk); | |
498 | clk_put(pcm->pclk); | |
499 | err4: | |
500 | iounmap(pcm->regs); | |
501 | err3: | |
502 | release_mem_region(mem_res->start, resource_size(mem_res)); | |
503 | err2: | |
504 | clk_disable(pcm->cclk); | |
505 | clk_put(pcm->cclk); | |
506 | err1: | |
507 | return ret; | |
508 | } | |
509 | ||
510 | static __devexit int s3c_pcm_dev_remove(struct platform_device *pdev) | |
511 | { | |
512 | struct s3c_pcm_info *pcm = &s3c_pcm[pdev->id]; | |
513 | struct resource *mem_res; | |
514 | ||
515 | iounmap(pcm->regs); | |
516 | ||
517 | mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
518 | release_mem_region(mem_res->start, resource_size(mem_res)); | |
519 | ||
520 | clk_disable(pcm->cclk); | |
521 | clk_disable(pcm->pclk); | |
522 | clk_put(pcm->pclk); | |
523 | clk_put(pcm->cclk); | |
524 | ||
525 | return 0; | |
526 | } | |
527 | ||
528 | static struct platform_driver s3c_pcm_driver = { | |
529 | .probe = s3c_pcm_dev_probe, | |
530 | .remove = s3c_pcm_dev_remove, | |
531 | .driver = { | |
532 | .name = "samsung-pcm", | |
533 | .owner = THIS_MODULE, | |
534 | }, | |
535 | }; | |
536 | ||
537 | static int __init s3c_pcm_init(void) | |
538 | { | |
539 | return platform_driver_register(&s3c_pcm_driver); | |
540 | } | |
541 | module_init(s3c_pcm_init); | |
542 | ||
543 | static void __exit s3c_pcm_exit(void) | |
544 | { | |
545 | platform_driver_unregister(&s3c_pcm_driver); | |
546 | } | |
547 | module_exit(s3c_pcm_exit); | |
548 | ||
549 | /* Module information */ | |
550 | MODULE_AUTHOR("Jaswinder Singh, <jassi.brar@samsung.com>"); | |
551 | MODULE_DESCRIPTION("S3C PCM Controller Driver"); | |
552 | MODULE_LICENSE("GPL"); |