1 // SPDX-License-Identifier: GPL-2.0-only
2 //
3 // rt712-sdca-sdw.c -- rt712 SDCA ALSA SoC audio driver
4 //
5 // Copyright(c) 2023 Realtek Semiconductor Corp.
6 //
7 //
8
9 #include <linux/delay.h>
10 #include <linux/device.h>
11 #include <linux/mod_devicetable.h>
12 #include <linux/module.h>
13 #include <linux/pm_runtime.h>
14 #include <linux/soundwire/sdw_registers.h>
15 #include "rt712-sdca.h"
16 #include "rt712-sdca-sdw.h"
17
18 static bool rt712_sdca_readable_register(struct device *dev, unsigned int reg)
19 {
20 switch (reg) {
21 case 0x201a ... 0x201f:
22 case 0x2029 ... 0x202a:
23 case 0x202d ... 0x2034:
24 case 0x2230 ... 0x2232:
25 case 0x2f01 ... 0x2f0a:
26 case 0x2f35 ... 0x2f36:
27 case 0x2f50:
28 case 0x2f54:
29 case 0x2f58 ... 0x2f5d:
30 case 0x3201:
31 case 0x320c:
32 case 0x3301 ... 0x3303:
33 case SDW_SDCA_CTL(FUNC_NUM_JACK_CODEC, RT712_SDCA_ENT_GE49, RT712_SDCA_CTL_SELECTED_MODE, 0):
34 case SDW_SDCA_CTL(FUNC_NUM_JACK_CODEC, RT712_SDCA_ENT_GE49, RT712_SDCA_CTL_DETECTED_MODE, 0):
35 case SDW_SDCA_CTL(FUNC_NUM_HID, RT712_SDCA_ENT_HID01, RT712_SDCA_CTL_HIDTX_CURRENT_OWNER, 0) ...
36 SDW_SDCA_CTL(FUNC_NUM_HID, RT712_SDCA_ENT_HID01, RT712_SDCA_CTL_HIDTX_MESSAGE_LENGTH, 0):
37 case SDW_SDCA_CTL(FUNC_NUM_JACK_CODEC, RT712_SDCA_ENT0, RT712_SDCA_CTL_FUNC_STATUS, 0):
38 case SDW_SDCA_CTL(FUNC_NUM_MIC_ARRAY, RT712_SDCA_ENT0, RT712_SDCA_CTL_FUNC_STATUS, 0):
39 case SDW_SDCA_CTL(FUNC_NUM_HID, RT712_SDCA_ENT0, RT712_SDCA_CTL_FUNC_STATUS, 0):
40 case SDW_SDCA_CTL(FUNC_NUM_AMP, RT712_SDCA_ENT0, RT712_SDCA_CTL_FUNC_STATUS, 0):
41 case RT712_BUF_ADDR_HID1 ... RT712_BUF_ADDR_HID2:
42 return true;
43 default:
44 return false;
45 }
46 }
47
48 static bool rt712_sdca_volatile_register(struct device *dev, unsigned int reg)
49 {
50 switch (reg) {
51 case 0x201b:
52 case 0x201c:
53 case 0x201d:
54 case 0x201f:
55 case 0x202d ... 0x202f:
56 case 0x2230:
57 case 0x2f01:
58 case 0x2f35:
59 case 0x320c:
60 case SDW_SDCA_CTL(FUNC_NUM_JACK_CODEC, RT712_SDCA_ENT_GE49, RT712_SDCA_CTL_DETECTED_MODE, 0):
61 case SDW_SDCA_CTL(FUNC_NUM_HID, RT712_SDCA_ENT_HID01, RT712_SDCA_CTL_HIDTX_CURRENT_OWNER, 0) ...
62 SDW_SDCA_CTL(FUNC_NUM_HID, RT712_SDCA_ENT_HID01, RT712_SDCA_CTL_HIDTX_MESSAGE_LENGTH, 0):
63 case SDW_SDCA_CTL(FUNC_NUM_JACK_CODEC, RT712_SDCA_ENT0, RT712_SDCA_CTL_FUNC_STATUS, 0):
64 case SDW_SDCA_CTL(FUNC_NUM_MIC_ARRAY, RT712_SDCA_ENT0, RT712_SDCA_CTL_FUNC_STATUS, 0):
65 case SDW_SDCA_CTL(FUNC_NUM_HID, RT712_SDCA_ENT0, RT712_SDCA_CTL_FUNC_STATUS, 0):
66 case SDW_SDCA_CTL(FUNC_NUM_AMP, RT712_SDCA_ENT0, RT712_SDCA_CTL_FUNC_STATUS, 0):
67 case RT712_BUF_ADDR_HID1 ... RT712_BUF_ADDR_HID2:
68 return true;
69 default:
70 return false;
71 }
72 }
73
74 static bool rt712_sdca_mbq_readable_register(struct device *dev, unsigned int reg)
75 {
76 switch (reg) {
77 case 0x2000000 ... 0x200008e:
78 case 0x5300000 ... 0x530000e:
79 case 0x5400000 ... 0x540000e:
80 case 0x5600000 ... 0x5600008:
81 case 0x5700000 ... 0x570000d:
82 case 0x5800000 ... 0x5800021:
83 case 0x5900000 ... 0x5900028:
84 case 0x5a00000 ... 0x5a00009:
85 case 0x5b00000 ... 0x5b00051:
86 case 0x5c00000 ... 0x5c0009a:
87 case 0x5d00000 ... 0x5d00009:
88 case 0x5f00000 ... 0x5f00030:
89 case 0x6100000 ... 0x61000f1:
90 case SDW_SDCA_CTL(FUNC_NUM_JACK_CODEC, RT712_SDCA_ENT_USER_FU05, RT712_SDCA_CTL_FU_VOLUME, CH_01):
91 case SDW_SDCA_CTL(FUNC_NUM_JACK_CODEC, RT712_SDCA_ENT_USER_FU05, RT712_SDCA_CTL_FU_VOLUME, CH_02):
92 case SDW_SDCA_CTL(FUNC_NUM_JACK_CODEC, RT712_SDCA_ENT_USER_FU0F, RT712_SDCA_CTL_FU_VOLUME, CH_01):
93 case SDW_SDCA_CTL(FUNC_NUM_JACK_CODEC, RT712_SDCA_ENT_USER_FU0F, RT712_SDCA_CTL_FU_VOLUME, CH_02):
94 case SDW_SDCA_CTL(FUNC_NUM_AMP, RT712_SDCA_ENT_USER_FU06, RT712_SDCA_CTL_FU_VOLUME, CH_01):
95 case SDW_SDCA_CTL(FUNC_NUM_AMP, RT712_SDCA_ENT_USER_FU06, RT712_SDCA_CTL_FU_VOLUME, CH_02):
96 case SDW_SDCA_CTL(FUNC_NUM_MIC_ARRAY, RT712_SDCA_ENT_USER_FU1E, RT712_SDCA_CTL_FU_VOLUME, CH_01):
97 case SDW_SDCA_CTL(FUNC_NUM_MIC_ARRAY, RT712_SDCA_ENT_USER_FU1E, RT712_SDCA_CTL_FU_VOLUME, CH_02):
98 case SDW_SDCA_CTL(FUNC_NUM_MIC_ARRAY, RT712_SDCA_ENT_USER_FU1E, RT712_SDCA_CTL_FU_VOLUME, CH_03):
99 case SDW_SDCA_CTL(FUNC_NUM_MIC_ARRAY, RT712_SDCA_ENT_USER_FU1E, RT712_SDCA_CTL_FU_VOLUME, CH_04):
100 case SDW_SDCA_CTL(FUNC_NUM_MIC_ARRAY, RT712_SDCA_ENT_PLATFORM_FU15, RT712_SDCA_CTL_FU_CH_GAIN, CH_01):
101 case SDW_SDCA_CTL(FUNC_NUM_MIC_ARRAY, RT712_SDCA_ENT_PLATFORM_FU15, RT712_SDCA_CTL_FU_CH_GAIN, CH_02):
102 case SDW_SDCA_CTL(FUNC_NUM_MIC_ARRAY, RT712_SDCA_ENT_PLATFORM_FU15, RT712_SDCA_CTL_FU_CH_GAIN, CH_03):
103 case SDW_SDCA_CTL(FUNC_NUM_MIC_ARRAY, RT712_SDCA_ENT_PLATFORM_FU15, RT712_SDCA_CTL_FU_CH_GAIN, CH_04):
104 return true;
105 default:
106 return false;
107 }
108 }
109
110 static bool rt712_sdca_mbq_volatile_register(struct device *dev, unsigned int reg)
111 {
112 switch (reg) {
113 case 0x2000000:
114 case 0x200001a:
115 case 0x2000020:
116 case 0x2000024:
117 case 0x2000030:
118 case 0x2000046:
119 case 0x200008a:
120 case 0x5800000:
121 case 0x5800001:
122 case 0x6100008:
123 return true;
124 default:
125 return false;
126 }
127 }
128
129 static const struct regmap_config rt712_sdca_regmap = {
130 .reg_bits = 32,
131 .val_bits = 8,
132 .readable_reg = rt712_sdca_readable_register,
133 .volatile_reg = rt712_sdca_volatile_register,
134 .max_register = 0x44ffffff,
135 .reg_defaults = rt712_sdca_reg_defaults,
136 .num_reg_defaults = ARRAY_SIZE(rt712_sdca_reg_defaults),
137 .cache_type = REGCACHE_MAPLE,
138 .use_single_read = true,
139 .use_single_write = true,
140 };
141
142 static const struct regmap_config rt712_sdca_mbq_regmap = {
143 .name = "sdw-mbq",
144 .reg_bits = 32,
145 .val_bits = 16,
146 .readable_reg = rt712_sdca_mbq_readable_register,
147 .volatile_reg = rt712_sdca_mbq_volatile_register,
148 .max_register = 0x41000312,
149 .reg_defaults = rt712_sdca_mbq_defaults,
150 .num_reg_defaults = ARRAY_SIZE(rt712_sdca_mbq_defaults),
151 .cache_type = REGCACHE_MAPLE,
152 .use_single_read = true,
153 .use_single_write = true,
154 };
155
156 static int rt712_sdca_update_status(struct sdw_slave *slave,
157 enum sdw_slave_status status)
158 {
159 struct rt712_sdca_priv *rt712 = dev_get_drvdata(&slave->dev);
160
161 if (status == SDW_SLAVE_UNATTACHED)
162 rt712->hw_init = false;
163
164 if (status == SDW_SLAVE_ATTACHED) {
165 if (rt712->hs_jack) {
166 /*
167 * Due to the SCP_SDCA_INTMASK will be cleared by any reset, and then
168 * if the device attached again, we will need to set the setting back.
169 * It could avoid losing the jack detection interrupt.
170 * This also could sync with the cache value as the rt712_sdca_jack_init set.
171 */
172 sdw_write_no_pm(rt712->slave, SDW_SCP_SDCA_INTMASK1,
173 SDW_SCP_SDCA_INTMASK_SDCA_0);
174 sdw_write_no_pm(rt712->slave, SDW_SCP_SDCA_INTMASK2,
175 SDW_SCP_SDCA_INTMASK_SDCA_8);
176 }
177 }
178
179 /*
180 * Perform initialization only if slave status is present and
181 * hw_init flag is false
182 */
183 if (rt712->hw_init || status != SDW_SLAVE_ATTACHED)
184 return 0;
185
186 /* perform I/O transfers required for Slave initialization */
187 return rt712_sdca_io_init(&slave->dev, slave);
188 }
189
190 static int rt712_sdca_read_prop(struct sdw_slave *slave)
191 {
192 struct sdw_slave_prop *prop = &slave->prop;
193 int nval;
194 int i, j;
195 u32 bit;
196 unsigned long addr;
197 struct sdw_dpn_prop *dpn;
198
199 sdw_slave_read_prop(slave);
200
201 prop->scp_int1_mask = SDW_SCP_INT1_BUS_CLASH | SDW_SCP_INT1_PARITY;
202 prop->quirks = SDW_SLAVE_QUIRKS_INVALID_INITIAL_PARITY;
203
204 prop->paging_support = true;
205
206 /* first we need to allocate memory for set bits in port lists */
207 prop->source_ports = BIT(8) | BIT(4); /* BITMAP: 100010000 */
208 prop->sink_ports = BIT(3) | BIT(1); /* BITMAP: 00001010 */
209
210 nval = hweight32(prop->source_ports);
211 prop->src_dpn_prop = devm_kcalloc(&slave->dev, nval,
212 sizeof(*prop->src_dpn_prop), GFP_KERNEL);
213 if (!prop->src_dpn_prop)
214 return -ENOMEM;
215
216 i = 0;
217 dpn = prop->src_dpn_prop;
218 addr = prop->source_ports;
219 for_each_set_bit(bit, &addr, 32) {
220 dpn[i].num = bit;
221 dpn[i].type = SDW_DPN_FULL;
222 dpn[i].simple_ch_prep_sm = true;
223 dpn[i].ch_prep_timeout = 10;
224 i++;
225 }
226
227 /* do this again for sink now */
228 nval = hweight32(prop->sink_ports);
229 prop->sink_dpn_prop = devm_kcalloc(&slave->dev, nval,
230 sizeof(*prop->sink_dpn_prop), GFP_KERNEL);
231 if (!prop->sink_dpn_prop)
232 return -ENOMEM;
233
234 j = 0;
235 dpn = prop->sink_dpn_prop;
236 addr = prop->sink_ports;
237 for_each_set_bit(bit, &addr, 32) {
238 dpn[j].num = bit;
239 dpn[j].type = SDW_DPN_FULL;
240 dpn[j].simple_ch_prep_sm = true;
241 dpn[j].ch_prep_timeout = 10;
242 j++;
243 }
244
245 /* set the timeout values */
246 prop->clk_stop_timeout = 1380;
247
248 /* wake-up event */
249 prop->wake_capable = 1;
250
251 return 0;
252 }
253
254 static int rt712_sdca_interrupt_callback(struct sdw_slave *slave,
255 struct sdw_slave_intr_status *status)
256 {
257 struct rt712_sdca_priv *rt712 = dev_get_drvdata(&slave->dev);
258 int ret, stat;
259 int count = 0, retry = 3;
260 unsigned int sdca_cascade, scp_sdca_stat1, scp_sdca_stat2 = 0;
261
262 dev_dbg(&slave->dev,
263 "%s control_port_stat=%x, sdca_cascade=%x", __func__,
264 status->control_port, status->sdca_cascade);
265
266 if (cancel_delayed_work_sync(&rt712->jack_detect_work)) {
267 dev_warn(&slave->dev, "%s the pending delayed_work was cancelled", __func__);
268 /* avoid the HID owner doesn't change to device */
269 if (rt712->scp_sdca_stat2)
270 scp_sdca_stat2 = rt712->scp_sdca_stat2;
271 }
272
273 /*
274 * The critical section below intentionally protects a rather large piece of code.
275 * We don't want to allow the system suspend to disable an interrupt while we are
276 * processing it, which could be problematic given the quirky SoundWire interrupt
277 * scheme. We do want however to prevent new workqueues from being scheduled if
278 * the disable_irq flag was set during system suspend.
279 */
280 mutex_lock(&rt712->disable_irq_lock);
281
282 ret = sdw_read_no_pm(rt712->slave, SDW_SCP_SDCA_INT1);
283 if (ret < 0)
284 goto io_error;
285 rt712->scp_sdca_stat1 = ret;
286 ret = sdw_read_no_pm(rt712->slave, SDW_SCP_SDCA_INT2);
287 if (ret < 0)
288 goto io_error;
289 rt712->scp_sdca_stat2 = ret;
290 if (scp_sdca_stat2)
291 rt712->scp_sdca_stat2 |= scp_sdca_stat2;
292
293 do {
294 /* clear flag */
295 ret = sdw_read_no_pm(rt712->slave, SDW_SCP_SDCA_INT1);
296 if (ret < 0)
297 goto io_error;
298 if (ret & SDW_SCP_SDCA_INTMASK_SDCA_0) {
299 ret = sdw_write_no_pm(rt712->slave, SDW_SCP_SDCA_INT1,
300 SDW_SCP_SDCA_INTMASK_SDCA_0);
301 if (ret < 0)
302 goto io_error;
303 }
304 ret = sdw_read_no_pm(rt712->slave, SDW_SCP_SDCA_INT2);
305 if (ret < 0)
306 goto io_error;
307 if (ret & SDW_SCP_SDCA_INTMASK_SDCA_8) {
308 ret = sdw_write_no_pm(rt712->slave, SDW_SCP_SDCA_INT2,
309 SDW_SCP_SDCA_INTMASK_SDCA_8);
310 if (ret < 0)
311 goto io_error;
312 }
313
314 /* check if flag clear or not */
315 ret = sdw_read_no_pm(rt712->slave, SDW_DP0_INT);
316 if (ret < 0)
317 goto io_error;
318 sdca_cascade = ret & SDW_DP0_SDCA_CASCADE;
319
320 ret = sdw_read_no_pm(rt712->slave, SDW_SCP_SDCA_INT1);
321 if (ret < 0)
322 goto io_error;
323 scp_sdca_stat1 = ret & SDW_SCP_SDCA_INTMASK_SDCA_0;
324
325 ret = sdw_read_no_pm(rt712->slave, SDW_SCP_SDCA_INT2);
326 if (ret < 0)
327 goto io_error;
328 scp_sdca_stat2 = ret & SDW_SCP_SDCA_INTMASK_SDCA_8;
329
330 stat = scp_sdca_stat1 || scp_sdca_stat2 || sdca_cascade;
331
332 count++;
333 } while (stat != 0 && count < retry);
334
335 if (stat)
336 dev_warn(&slave->dev,
337 "%s scp_sdca_stat1=0x%x, scp_sdca_stat2=0x%x\n", __func__,
338 rt712->scp_sdca_stat1, rt712->scp_sdca_stat2);
339
340 if (status->sdca_cascade && !rt712->disable_irq)
341 mod_delayed_work(system_power_efficient_wq,
342 &rt712->jack_detect_work, msecs_to_jiffies(30));
343
344 mutex_unlock(&rt712->disable_irq_lock);
345
346 return 0;
347
348 io_error:
349 mutex_unlock(&rt712->disable_irq_lock);
350 pr_err_ratelimited("IO error in %s, ret %d\n", __func__, ret);
351 return ret;
352 }
353
354 static const struct sdw_slave_ops rt712_sdca_slave_ops = {
355 .read_prop = rt712_sdca_read_prop,
356 .interrupt_callback = rt712_sdca_interrupt_callback,
357 .update_status = rt712_sdca_update_status,
358 };
359
360 static int rt712_sdca_sdw_probe(struct sdw_slave *slave,
361 const struct sdw_device_id *id)
362 {
363 struct regmap *regmap, *mbq_regmap;
364
365 /* Regmap Initialization */
366 mbq_regmap = devm_regmap_init_sdw_mbq(slave, &rt712_sdca_mbq_regmap);
367 if (IS_ERR(mbq_regmap))
368 return PTR_ERR(mbq_regmap);
369
370 regmap = devm_regmap_init_sdw(slave, &rt712_sdca_regmap);
371 if (IS_ERR(regmap))
372 return PTR_ERR(regmap);
373
374 return rt712_sdca_init(&slave->dev, regmap, mbq_regmap, slave);
375 }
376
377 static int rt712_sdca_sdw_remove(struct sdw_slave *slave)
378 {
379 struct rt712_sdca_priv *rt712 = dev_get_drvdata(&slave->dev);
380
381 if (rt712->hw_init) {
382 cancel_delayed_work_sync(&rt712->jack_detect_work);
383 cancel_delayed_work_sync(&rt712->jack_btn_check_work);
384 }
385
386 pm_runtime_disable(&slave->dev);
387
388 mutex_destroy(&rt712->calibrate_mutex);
389 mutex_destroy(&rt712->disable_irq_lock);
390
391 return 0;
392 }
393
394 static const struct sdw_device_id rt712_sdca_id[] = {
395 SDW_SLAVE_ENTRY_EXT(0x025d, 0x712, 0x3, 0x1, 0),
396 SDW_SLAVE_ENTRY_EXT(0x025d, 0x713, 0x3, 0x1, 0),
397 SDW_SLAVE_ENTRY_EXT(0x025d, 0x716, 0x3, 0x1, 0),
398 SDW_SLAVE_ENTRY_EXT(0x025d, 0x717, 0x3, 0x1, 0),
399 {},
400 };
401 MODULE_DEVICE_TABLE(sdw, rt712_sdca_id);
402
403 static int __maybe_unused rt712_sdca_dev_suspend(struct device *dev)
404 {
405 struct rt712_sdca_priv *rt712 = dev_get_drvdata(dev);
406
407 if (!rt712->hw_init)
408 return 0;
409
410 cancel_delayed_work_sync(&rt712->jack_detect_work);
411 cancel_delayed_work_sync(&rt712->jack_btn_check_work);
412
413 regcache_cache_only(rt712->regmap, true);
414 regcache_cache_only(rt712->mbq_regmap, true);
415
416 return 0;
417 }
418
419 static int __maybe_unused rt712_sdca_dev_system_suspend(struct device *dev)
420 {
421 struct rt712_sdca_priv *rt712_sdca = dev_get_drvdata(dev);
422 struct sdw_slave *slave = dev_to_sdw_dev(dev);
423 int ret1, ret2;
424
425 if (!rt712_sdca->hw_init)
426 return 0;
427
428 /*
429 * prevent new interrupts from being handled after the
430 * deferred work completes and before the parent disables
431 * interrupts on the link
432 */
433 mutex_lock(&rt712_sdca->disable_irq_lock);
434 rt712_sdca->disable_irq = true;
435 ret1 = sdw_update_no_pm(slave, SDW_SCP_SDCA_INTMASK1,
436 SDW_SCP_SDCA_INTMASK_SDCA_0, 0);
437 ret2 = sdw_update_no_pm(slave, SDW_SCP_SDCA_INTMASK2,
438 SDW_SCP_SDCA_INTMASK_SDCA_8, 0);
439 mutex_unlock(&rt712_sdca->disable_irq_lock);
440
441 if (ret1 < 0 || ret2 < 0) {
442 /* log but don't prevent suspend from happening */
443 dev_dbg(&slave->dev, "%s: could not disable SDCA interrupts\n:", __func__);
444 }
445
446 return rt712_sdca_dev_suspend(dev);
447 }
448
449 #define RT712_PROBE_TIMEOUT 5000
450
451 static int __maybe_unused rt712_sdca_dev_resume(struct device *dev)
452 {
453 struct sdw_slave *slave = dev_to_sdw_dev(dev);
454 struct rt712_sdca_priv *rt712 = dev_get_drvdata(dev);
455 unsigned long time;
456
457 if (!rt712->first_hw_init)
458 return 0;
459
460 if (!slave->unattach_request) {
461 mutex_lock(&rt712->disable_irq_lock);
462 if (rt712->disable_irq == true) {
463
464 sdw_write_no_pm(slave, SDW_SCP_SDCA_INTMASK1, SDW_SCP_SDCA_INTMASK_SDCA_0);
465 sdw_write_no_pm(slave, SDW_SCP_SDCA_INTMASK2, SDW_SCP_SDCA_INTMASK_SDCA_8);
466 rt712->disable_irq = false;
467 }
468 mutex_unlock(&rt712->disable_irq_lock);
469 goto regmap_sync;
470 }
471
472 time = wait_for_completion_timeout(&slave->initialization_complete,
473 msecs_to_jiffies(RT712_PROBE_TIMEOUT));
474 if (!time) {
475 dev_err(&slave->dev, "%s: Initialization not complete, timed out\n", __func__);
476 sdw_show_ping_status(slave->bus, true);
477
478 return -ETIMEDOUT;
479 }
480
481 regmap_sync:
482 slave->unattach_request = 0;
483 regcache_cache_only(rt712->regmap, false);
484 regcache_sync(rt712->regmap);
485 regcache_cache_only(rt712->mbq_regmap, false);
486 regcache_sync(rt712->mbq_regmap);
487 return 0;
488 }
489
490 static const struct dev_pm_ops rt712_sdca_pm = {
491 SET_SYSTEM_SLEEP_PM_OPS(rt712_sdca_dev_system_suspend, rt712_sdca_dev_resume)
492 SET_RUNTIME_PM_OPS(rt712_sdca_dev_suspend, rt712_sdca_dev_resume, NULL)
493 };
494
495 static struct sdw_driver rt712_sdca_sdw_driver = {
496 .driver = {
497 .name = "rt712-sdca",
498 .pm = &rt712_sdca_pm,
499 },
500 .probe = rt712_sdca_sdw_probe,
501 .remove = rt712_sdca_sdw_remove,
502 .ops = &rt712_sdca_slave_ops,
503 .id_table = rt712_sdca_id,
504 };
505 module_sdw_driver(rt712_sdca_sdw_driver);
506
507 MODULE_DESCRIPTION("ASoC RT712 SDCA SDW driver");
508 MODULE_AUTHOR("Shuming Fan <shumingf@realtek.com>");
509 MODULE_LICENSE("GPL");
510
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