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16#include <linux/dma-mapping.h>
17#include <linux/export.h>
18#include <linux/kernel.h>
19#include <linux/module.h>
20#include <linux/platform_device.h>
21#include <sound/pcm_params.h>
22#include <linux/regmap.h>
23#include <sound/soc.h>
24#include "lpass-lpaif-reg.h"
25#include "lpass.h"
26
27struct lpass_pcm_data {
28 int rdma_ch;
29 int wrdma_ch;
30 int i2s_port;
31};
32
33#define LPASS_PLATFORM_BUFFER_SIZE (16 * 1024)
34#define LPASS_PLATFORM_PERIODS 2
35
36static struct snd_pcm_hardware lpass_platform_pcm_hardware = {
37 .info = SNDRV_PCM_INFO_MMAP |
38 SNDRV_PCM_INFO_MMAP_VALID |
39 SNDRV_PCM_INFO_INTERLEAVED |
40 SNDRV_PCM_INFO_PAUSE |
41 SNDRV_PCM_INFO_RESUME,
42 .formats = SNDRV_PCM_FMTBIT_S16 |
43 SNDRV_PCM_FMTBIT_S24 |
44 SNDRV_PCM_FMTBIT_S32,
45 .rates = SNDRV_PCM_RATE_8000_192000,
46 .rate_min = 8000,
47 .rate_max = 192000,
48 .channels_min = 1,
49 .channels_max = 8,
50 .buffer_bytes_max = LPASS_PLATFORM_BUFFER_SIZE,
51 .period_bytes_max = LPASS_PLATFORM_BUFFER_SIZE /
52 LPASS_PLATFORM_PERIODS,
53 .period_bytes_min = LPASS_PLATFORM_BUFFER_SIZE /
54 LPASS_PLATFORM_PERIODS,
55 .periods_min = LPASS_PLATFORM_PERIODS,
56 .periods_max = LPASS_PLATFORM_PERIODS,
57 .fifo_size = 0,
58};
59
60static int lpass_platform_pcmops_open(struct snd_pcm_substream *substream)
61{
62 struct snd_pcm_runtime *runtime = substream->runtime;
63 struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
64 int ret;
65
66 snd_soc_set_runtime_hwparams(substream, &lpass_platform_pcm_hardware);
67
68 runtime->dma_bytes = lpass_platform_pcm_hardware.buffer_bytes_max;
69
70 ret = snd_pcm_hw_constraint_integer(runtime,
71 SNDRV_PCM_HW_PARAM_PERIODS);
72 if (ret < 0) {
73 dev_err(soc_runtime->dev, "%s() setting constraints failed: %d\n",
74 __func__, ret);
75 return -EINVAL;
76 }
77
78 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
79
80 return 0;
81}
82
83static int lpass_platform_pcmops_hw_params(struct snd_pcm_substream *substream,
84 struct snd_pcm_hw_params *params)
85{
86 struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
87 struct lpass_pcm_data *pcm_data = snd_soc_pcm_get_drvdata(soc_runtime);
88 struct lpass_data *drvdata =
89 snd_soc_platform_get_drvdata(soc_runtime->platform);
90 struct lpass_variant *v = drvdata->variant;
91 snd_pcm_format_t format = params_format(params);
92 unsigned int channels = params_channels(params);
93 unsigned int regval;
94 int ch, dir = substream->stream;
95 int bitwidth;
96 int ret, dma_port = pcm_data->i2s_port + v->dmactl_audif_start;
97
98 if (dir == SNDRV_PCM_STREAM_PLAYBACK)
99 ch = pcm_data->rdma_ch;
100 else
101 ch = pcm_data->wrdma_ch;
102
103 bitwidth = snd_pcm_format_width(format);
104 if (bitwidth < 0) {
105 dev_err(soc_runtime->dev, "%s() invalid bit width given: %d\n",
106 __func__, bitwidth);
107 return bitwidth;
108 }
109
110 regval = LPAIF_DMACTL_BURSTEN_INCR4 |
111 LPAIF_DMACTL_AUDINTF(dma_port) |
112 LPAIF_DMACTL_FIFOWM_8;
113
114 switch (bitwidth) {
115 case 16:
116 switch (channels) {
117 case 1:
118 case 2:
119 regval |= LPAIF_DMACTL_WPSCNT_ONE;
120 break;
121 case 4:
122 regval |= LPAIF_DMACTL_WPSCNT_TWO;
123 break;
124 case 6:
125 regval |= LPAIF_DMACTL_WPSCNT_THREE;
126 break;
127 case 8:
128 regval |= LPAIF_DMACTL_WPSCNT_FOUR;
129 break;
130 default:
131 dev_err(soc_runtime->dev, "%s() invalid PCM config given: bw=%d, ch=%u\n",
132 __func__, bitwidth, channels);
133 return -EINVAL;
134 }
135 break;
136 case 24:
137 case 32:
138 switch (channels) {
139 case 1:
140 regval |= LPAIF_DMACTL_WPSCNT_ONE;
141 break;
142 case 2:
143 regval |= LPAIF_DMACTL_WPSCNT_TWO;
144 break;
145 case 4:
146 regval |= LPAIF_DMACTL_WPSCNT_FOUR;
147 break;
148 case 6:
149 regval |= LPAIF_DMACTL_WPSCNT_SIX;
150 break;
151 case 8:
152 regval |= LPAIF_DMACTL_WPSCNT_EIGHT;
153 break;
154 default:
155 dev_err(soc_runtime->dev, "%s() invalid PCM config given: bw=%d, ch=%u\n",
156 __func__, bitwidth, channels);
157 return -EINVAL;
158 }
159 break;
160 default:
161 dev_err(soc_runtime->dev, "%s() invalid PCM config given: bw=%d, ch=%u\n",
162 __func__, bitwidth, channels);
163 return -EINVAL;
164 }
165
166 ret = regmap_write(drvdata->lpaif_map,
167 LPAIF_DMACTL_REG(v, ch, dir), regval);
168 if (ret) {
169 dev_err(soc_runtime->dev, "%s() error writing to rdmactl reg: %d\n",
170 __func__, ret);
171 return ret;
172 }
173
174 return 0;
175}
176
177static int lpass_platform_pcmops_hw_free(struct snd_pcm_substream *substream)
178{
179 struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
180 struct lpass_pcm_data *pcm_data = snd_soc_pcm_get_drvdata(soc_runtime);
181 struct lpass_data *drvdata =
182 snd_soc_platform_get_drvdata(soc_runtime->platform);
183 struct lpass_variant *v = drvdata->variant;
184 unsigned int reg;
185 int ret;
186
187 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
188 reg = LPAIF_RDMACTL_REG(v, pcm_data->rdma_ch);
189 else
190 reg = LPAIF_WRDMACTL_REG(v, pcm_data->wrdma_ch);
191
192 ret = regmap_write(drvdata->lpaif_map, reg, 0);
193 if (ret)
194 dev_err(soc_runtime->dev, "%s() error writing to rdmactl reg: %d\n",
195 __func__, ret);
196
197 return ret;
198}
199
200static int lpass_platform_pcmops_prepare(struct snd_pcm_substream *substream)
201{
202 struct snd_pcm_runtime *runtime = substream->runtime;
203 struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
204 struct lpass_pcm_data *pcm_data = snd_soc_pcm_get_drvdata(soc_runtime);
205 struct lpass_data *drvdata =
206 snd_soc_platform_get_drvdata(soc_runtime->platform);
207 struct lpass_variant *v = drvdata->variant;
208 int ret, ch, dir = substream->stream;
209
210 if (dir == SNDRV_PCM_STREAM_PLAYBACK)
211 ch = pcm_data->rdma_ch;
212 else
213 ch = pcm_data->wrdma_ch;
214
215 ret = regmap_write(drvdata->lpaif_map,
216 LPAIF_DMABASE_REG(v, ch, dir),
217 runtime->dma_addr);
218 if (ret) {
219 dev_err(soc_runtime->dev, "%s() error writing to rdmabase reg: %d\n",
220 __func__, ret);
221 return ret;
222 }
223
224 ret = regmap_write(drvdata->lpaif_map,
225 LPAIF_DMABUFF_REG(v, ch, dir),
226 (snd_pcm_lib_buffer_bytes(substream) >> 2) - 1);
227 if (ret) {
228 dev_err(soc_runtime->dev, "%s() error writing to rdmabuff reg: %d\n",
229 __func__, ret);
230 return ret;
231 }
232
233 ret = regmap_write(drvdata->lpaif_map,
234 LPAIF_DMAPER_REG(v, ch, dir),
235 (snd_pcm_lib_period_bytes(substream) >> 2) - 1);
236 if (ret) {
237 dev_err(soc_runtime->dev, "%s() error writing to rdmaper reg: %d\n",
238 __func__, ret);
239 return ret;
240 }
241
242 ret = regmap_update_bits(drvdata->lpaif_map,
243 LPAIF_DMACTL_REG(v, ch, dir),
244 LPAIF_DMACTL_ENABLE_MASK, LPAIF_DMACTL_ENABLE_ON);
245 if (ret) {
246 dev_err(soc_runtime->dev, "%s() error writing to rdmactl reg: %d\n",
247 __func__, ret);
248 return ret;
249 }
250
251 return 0;
252}
253
254static int lpass_platform_pcmops_trigger(struct snd_pcm_substream *substream,
255 int cmd)
256{
257 struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
258 struct lpass_pcm_data *pcm_data = snd_soc_pcm_get_drvdata(soc_runtime);
259 struct lpass_data *drvdata =
260 snd_soc_platform_get_drvdata(soc_runtime->platform);
261 struct lpass_variant *v = drvdata->variant;
262 int ret, ch, dir = substream->stream;
263
264 if (dir == SNDRV_PCM_STREAM_PLAYBACK)
265 ch = pcm_data->rdma_ch;
266 else
267 ch = pcm_data->wrdma_ch;
268
269 switch (cmd) {
270 case SNDRV_PCM_TRIGGER_START:
271 case SNDRV_PCM_TRIGGER_RESUME:
272 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
273
274 ret = regmap_write(drvdata->lpaif_map,
275 LPAIF_IRQCLEAR_REG(v, LPAIF_IRQ_PORT_HOST),
276 LPAIF_IRQ_ALL(ch));
277 if (ret) {
278 dev_err(soc_runtime->dev, "%s() error writing to irqclear reg: %d\n",
279 __func__, ret);
280 return ret;
281 }
282
283 ret = regmap_update_bits(drvdata->lpaif_map,
284 LPAIF_IRQEN_REG(v, LPAIF_IRQ_PORT_HOST),
285 LPAIF_IRQ_ALL(ch),
286 LPAIF_IRQ_ALL(ch));
287 if (ret) {
288 dev_err(soc_runtime->dev, "%s() error writing to irqen reg: %d\n",
289 __func__, ret);
290 return ret;
291 }
292
293 ret = regmap_update_bits(drvdata->lpaif_map,
294 LPAIF_DMACTL_REG(v, ch, dir),
295 LPAIF_DMACTL_ENABLE_MASK,
296 LPAIF_DMACTL_ENABLE_ON);
297 if (ret) {
298 dev_err(soc_runtime->dev, "%s() error writing to rdmactl reg: %d\n",
299 __func__, ret);
300 return ret;
301 }
302 break;
303 case SNDRV_PCM_TRIGGER_STOP:
304 case SNDRV_PCM_TRIGGER_SUSPEND:
305 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
306 ret = regmap_update_bits(drvdata->lpaif_map,
307 LPAIF_DMACTL_REG(v, ch, dir),
308 LPAIF_DMACTL_ENABLE_MASK,
309 LPAIF_DMACTL_ENABLE_OFF);
310 if (ret) {
311 dev_err(soc_runtime->dev, "%s() error writing to rdmactl reg: %d\n",
312 __func__, ret);
313 return ret;
314 }
315
316 ret = regmap_update_bits(drvdata->lpaif_map,
317 LPAIF_IRQEN_REG(v, LPAIF_IRQ_PORT_HOST),
318 LPAIF_IRQ_ALL(ch), 0);
319 if (ret) {
320 dev_err(soc_runtime->dev, "%s() error writing to irqen reg: %d\n",
321 __func__, ret);
322 return ret;
323 }
324 break;
325 }
326
327 return 0;
328}
329
330static snd_pcm_uframes_t lpass_platform_pcmops_pointer(
331 struct snd_pcm_substream *substream)
332{
333 struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
334 struct lpass_pcm_data *pcm_data = snd_soc_pcm_get_drvdata(soc_runtime);
335 struct lpass_data *drvdata =
336 snd_soc_platform_get_drvdata(soc_runtime->platform);
337 struct lpass_variant *v = drvdata->variant;
338 unsigned int base_addr, curr_addr;
339 int ret, ch, dir = substream->stream;
340
341 if (dir == SNDRV_PCM_STREAM_PLAYBACK)
342 ch = pcm_data->rdma_ch;
343 else
344 ch = pcm_data->wrdma_ch;
345
346 ret = regmap_read(drvdata->lpaif_map,
347 LPAIF_DMABASE_REG(v, ch, dir), &base_addr);
348 if (ret) {
349 dev_err(soc_runtime->dev, "%s() error reading from rdmabase reg: %d\n",
350 __func__, ret);
351 return ret;
352 }
353
354 ret = regmap_read(drvdata->lpaif_map,
355 LPAIF_DMACURR_REG(v, ch, dir), &curr_addr);
356 if (ret) {
357 dev_err(soc_runtime->dev, "%s() error reading from rdmacurr reg: %d\n",
358 __func__, ret);
359 return ret;
360 }
361
362 return bytes_to_frames(substream->runtime, curr_addr - base_addr);
363}
364
365static int lpass_platform_pcmops_mmap(struct snd_pcm_substream *substream,
366 struct vm_area_struct *vma)
367{
368 struct snd_pcm_runtime *runtime = substream->runtime;
369
370 return dma_mmap_coherent(substream->pcm->card->dev, vma,
371 runtime->dma_area, runtime->dma_addr,
372 runtime->dma_bytes);
373}
374
375static struct snd_pcm_ops lpass_platform_pcm_ops = {
376 .open = lpass_platform_pcmops_open,
377 .ioctl = snd_pcm_lib_ioctl,
378 .hw_params = lpass_platform_pcmops_hw_params,
379 .hw_free = lpass_platform_pcmops_hw_free,
380 .prepare = lpass_platform_pcmops_prepare,
381 .trigger = lpass_platform_pcmops_trigger,
382 .pointer = lpass_platform_pcmops_pointer,
383 .mmap = lpass_platform_pcmops_mmap,
384};
385
386static irqreturn_t lpass_dma_interrupt_handler(
387 struct snd_pcm_substream *substream,
388 struct lpass_data *drvdata,
389 int chan, u32 interrupts)
390{
391 struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
392 struct lpass_variant *v = drvdata->variant;
393 irqreturn_t ret = IRQ_NONE;
394 int rv;
395
396 if (interrupts & LPAIF_IRQ_PER(chan)) {
397 rv = regmap_write(drvdata->lpaif_map,
398 LPAIF_IRQCLEAR_REG(v, LPAIF_IRQ_PORT_HOST),
399 LPAIF_IRQ_PER(chan));
400 if (rv) {
401 dev_err(soc_runtime->dev, "%s() error writing to irqclear reg: %d\n",
402 __func__, rv);
403 return IRQ_NONE;
404 }
405 snd_pcm_period_elapsed(substream);
406 ret = IRQ_HANDLED;
407 }
408
409 if (interrupts & LPAIF_IRQ_XRUN(chan)) {
410 rv = regmap_write(drvdata->lpaif_map,
411 LPAIF_IRQCLEAR_REG(v, LPAIF_IRQ_PORT_HOST),
412 LPAIF_IRQ_XRUN(chan));
413 if (rv) {
414 dev_err(soc_runtime->dev, "%s() error writing to irqclear reg: %d\n",
415 __func__, rv);
416 return IRQ_NONE;
417 }
418 dev_warn(soc_runtime->dev, "%s() xrun warning\n", __func__);
419 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
420 ret = IRQ_HANDLED;
421 }
422
423 if (interrupts & LPAIF_IRQ_ERR(chan)) {
424 rv = regmap_write(drvdata->lpaif_map,
425 LPAIF_IRQCLEAR_REG(v, LPAIF_IRQ_PORT_HOST),
426 LPAIF_IRQ_ERR(chan));
427 if (rv) {
428 dev_err(soc_runtime->dev, "%s() error writing to irqclear reg: %d\n",
429 __func__, rv);
430 return IRQ_NONE;
431 }
432 dev_err(soc_runtime->dev, "%s() bus access error\n", __func__);
433 snd_pcm_stop(substream, SNDRV_PCM_STATE_DISCONNECTED);
434 ret = IRQ_HANDLED;
435 }
436
437 return ret;
438}
439
440static irqreturn_t lpass_platform_lpaif_irq(int irq, void *data)
441{
442 struct lpass_data *drvdata = data;
443 struct lpass_variant *v = drvdata->variant;
444 unsigned int irqs;
445 int rv, chan;
446
447 rv = regmap_read(drvdata->lpaif_map,
448 LPAIF_IRQSTAT_REG(v, LPAIF_IRQ_PORT_HOST), &irqs);
449 if (rv) {
450 pr_err("%s() error reading from irqstat reg: %d\n",
451 __func__, rv);
452 return IRQ_NONE;
453 }
454
455
456 for (chan = 0; chan < LPASS_MAX_DMA_CHANNELS; chan++) {
457 if (irqs & LPAIF_IRQ_ALL(chan) && drvdata->substream[chan]) {
458 rv = lpass_dma_interrupt_handler(
459 drvdata->substream[chan],
460 drvdata, chan, irqs);
461 if (rv != IRQ_HANDLED)
462 return rv;
463 }
464 }
465
466 return IRQ_HANDLED;
467}
468
469static int lpass_platform_pcm_new(struct snd_soc_pcm_runtime *soc_runtime)
470{
471 struct snd_pcm *pcm = soc_runtime->pcm;
472 struct snd_pcm_substream *psubstream, *csubstream;
473 struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai;
474 struct lpass_data *drvdata =
475 snd_soc_platform_get_drvdata(soc_runtime->platform);
476 struct lpass_variant *v = drvdata->variant;
477 int ret;
478 struct lpass_pcm_data *data;
479 size_t size = lpass_platform_pcm_hardware.buffer_bytes_max;
480
481 data = devm_kzalloc(soc_runtime->dev, sizeof(*data), GFP_KERNEL);
482 if (!data)
483 return -ENOMEM;
484
485 data->i2s_port = cpu_dai->driver->id;
486 snd_soc_pcm_set_drvdata(soc_runtime, data);
487
488 psubstream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
489 if (psubstream) {
490 if (v->alloc_dma_channel)
491 data->rdma_ch = v->alloc_dma_channel(drvdata,
492 SNDRV_PCM_STREAM_PLAYBACK);
493
494 if (IS_ERR_VALUE(data->rdma_ch))
495 return data->rdma_ch;
496
497 drvdata->substream[data->rdma_ch] = psubstream;
498
499 ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV,
500 soc_runtime->platform->dev,
501 size, &psubstream->dma_buffer);
502 if (ret)
503 goto playback_alloc_err;
504
505 ret = regmap_write(drvdata->lpaif_map,
506 LPAIF_RDMACTL_REG(v, data->rdma_ch), 0);
507 if (ret) {
508 dev_err(soc_runtime->dev,
509 "%s() error writing to rdmactl reg: %d\n",
510 __func__, ret);
511 goto capture_alloc_err;
512 }
513 }
514
515 csubstream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
516 if (csubstream) {
517 if (v->alloc_dma_channel)
518 data->wrdma_ch = v->alloc_dma_channel(drvdata,
519 SNDRV_PCM_STREAM_CAPTURE);
520
521 if (IS_ERR_VALUE(data->wrdma_ch))
522 goto capture_alloc_err;
523
524 drvdata->substream[data->wrdma_ch] = csubstream;
525
526 ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV,
527 soc_runtime->platform->dev,
528 size, &csubstream->dma_buffer);
529 if (ret)
530 goto capture_alloc_err;
531
532 ret = regmap_write(drvdata->lpaif_map,
533 LPAIF_WRDMACTL_REG(v, data->wrdma_ch), 0);
534 if (ret) {
535 dev_err(soc_runtime->dev,
536 "%s() error writing to wrdmactl reg: %d\n",
537 __func__, ret);
538 goto capture_reg_err;
539 }
540 }
541
542 return 0;
543
544capture_reg_err:
545 if (csubstream)
546 snd_dma_free_pages(&csubstream->dma_buffer);
547
548capture_alloc_err:
549 if (psubstream)
550 snd_dma_free_pages(&psubstream->dma_buffer);
551
552 playback_alloc_err:
553 dev_err(soc_runtime->dev, "Cannot allocate buffer(s)\n");
554
555 return ret;
556}
557
558static void lpass_platform_pcm_free(struct snd_pcm *pcm)
559{
560 struct snd_soc_pcm_runtime *rt;
561 struct lpass_data *drvdata;
562 struct lpass_pcm_data *data;
563 struct lpass_variant *v;
564 struct snd_pcm_substream *substream;
565 int ch, i;
566
567 for (i = 0; i < ARRAY_SIZE(pcm->streams); i++) {
568 substream = pcm->streams[i].substream;
569 if (substream) {
570 rt = substream->private_data;
571 data = snd_soc_pcm_get_drvdata(rt);
572 drvdata = snd_soc_platform_get_drvdata(rt->platform);
573
574 ch = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
575 ? data->rdma_ch
576 : data->wrdma_ch;
577 v = drvdata->variant;
578 drvdata->substream[ch] = NULL;
579 if (v->free_dma_channel)
580 v->free_dma_channel(drvdata, ch);
581
582 snd_dma_free_pages(&substream->dma_buffer);
583 substream->dma_buffer.area = NULL;
584 substream->dma_buffer.addr = 0;
585 }
586 }
587}
588
589static struct snd_soc_platform_driver lpass_platform_driver = {
590 .pcm_new = lpass_platform_pcm_new,
591 .pcm_free = lpass_platform_pcm_free,
592 .ops = &lpass_platform_pcm_ops,
593};
594
595int asoc_qcom_lpass_platform_register(struct platform_device *pdev)
596{
597 struct lpass_data *drvdata = platform_get_drvdata(pdev);
598 struct lpass_variant *v = drvdata->variant;
599 int ret;
600
601 drvdata->lpaif_irq = platform_get_irq_byname(pdev, "lpass-irq-lpaif");
602 if (drvdata->lpaif_irq < 0) {
603 dev_err(&pdev->dev, "%s() error getting irq handle: %d\n",
604 __func__, drvdata->lpaif_irq);
605 return -ENODEV;
606 }
607
608
609 ret = regmap_write(drvdata->lpaif_map,
610 LPAIF_IRQEN_REG(v, LPAIF_IRQ_PORT_HOST), 0);
611 if (ret) {
612 dev_err(&pdev->dev, "%s() error writing to irqen reg: %d\n",
613 __func__, ret);
614 return ret;
615 }
616
617 ret = devm_request_irq(&pdev->dev, drvdata->lpaif_irq,
618 lpass_platform_lpaif_irq, IRQF_TRIGGER_RISING,
619 "lpass-irq-lpaif", drvdata);
620 if (ret) {
621 dev_err(&pdev->dev, "%s() irq request failed: %d\n",
622 __func__, ret);
623 return ret;
624 }
625
626
627 return devm_snd_soc_register_platform(&pdev->dev,
628 &lpass_platform_driver);
629}
630EXPORT_SYMBOL_GPL(asoc_qcom_lpass_platform_register);
631
632MODULE_DESCRIPTION("QTi LPASS Platform Driver");
633MODULE_LICENSE("GPL v2");
634
