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0722249a CC |
1 | /* |
2 | * Generic Exynos Bus frequency driver with DEVFREQ Framework | |
3 | * | |
403e0689 | 4 | * Copyright (c) 2016 Samsung Electronics Co., Ltd. |
0722249a CC |
5 | * Author : Chanwoo Choi <cw00.choi@samsung.com> |
6 | * | |
7 | * This driver support Exynos Bus frequency feature by using | |
8 | * DEVFREQ framework and is based on drivers/devfreq/exynos/exynos4_bus.c. | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License version 2 as | |
12 | * published by the Free Software Foundation. | |
13 | */ | |
14 | ||
15 | #include <linux/clk.h> | |
16 | #include <linux/devfreq.h> | |
17 | #include <linux/devfreq-event.h> | |
18 | #include <linux/device.h> | |
19 | #include <linux/export.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/of_device.h> | |
22 | #include <linux/pm_opp.h> | |
23 | #include <linux/platform_device.h> | |
24 | #include <linux/regulator/consumer.h> | |
25 | #include <linux/slab.h> | |
26 | ||
27 | #define DEFAULT_SATURATION_RATIO 40 | |
28 | #define DEFAULT_VOLTAGE_TOLERANCE 2 | |
29 | ||
30 | struct exynos_bus { | |
31 | struct device *dev; | |
32 | ||
33 | struct devfreq *devfreq; | |
34 | struct devfreq_event_dev **edev; | |
35 | unsigned int edev_count; | |
36 | struct mutex lock; | |
37 | ||
38 | struct dev_pm_opp *curr_opp; | |
39 | ||
40 | struct regulator *regulator; | |
41 | struct clk *clk; | |
42 | unsigned int voltage_tolerance; | |
43 | unsigned int ratio; | |
44 | }; | |
45 | ||
46 | /* | |
47 | * Control the devfreq-event device to get the current state of bus | |
48 | */ | |
49 | #define exynos_bus_ops_edev(ops) \ | |
50 | static int exynos_bus_##ops(struct exynos_bus *bus) \ | |
51 | { \ | |
52 | int i, ret; \ | |
53 | \ | |
54 | for (i = 0; i < bus->edev_count; i++) { \ | |
55 | if (!bus->edev[i]) \ | |
56 | continue; \ | |
57 | ret = devfreq_event_##ops(bus->edev[i]); \ | |
58 | if (ret < 0) \ | |
59 | return ret; \ | |
60 | } \ | |
61 | \ | |
62 | return 0; \ | |
63 | } | |
64 | exynos_bus_ops_edev(enable_edev); | |
65 | exynos_bus_ops_edev(disable_edev); | |
66 | exynos_bus_ops_edev(set_event); | |
67 | ||
68 | static int exynos_bus_get_event(struct exynos_bus *bus, | |
69 | struct devfreq_event_data *edata) | |
70 | { | |
71 | struct devfreq_event_data event_data; | |
72 | unsigned long load_count = 0, total_count = 0; | |
73 | int i, ret = 0; | |
74 | ||
75 | for (i = 0; i < bus->edev_count; i++) { | |
76 | if (!bus->edev[i]) | |
77 | continue; | |
78 | ||
79 | ret = devfreq_event_get_event(bus->edev[i], &event_data); | |
80 | if (ret < 0) | |
81 | return ret; | |
82 | ||
83 | if (i == 0 || event_data.load_count > load_count) { | |
84 | load_count = event_data.load_count; | |
85 | total_count = event_data.total_count; | |
86 | } | |
87 | } | |
88 | ||
89 | edata->load_count = load_count; | |
90 | edata->total_count = total_count; | |
91 | ||
92 | return ret; | |
93 | } | |
94 | ||
95 | /* | |
403e0689 | 96 | * Must necessary function for devfreq simple-ondemand governor |
0722249a CC |
97 | */ |
98 | static int exynos_bus_target(struct device *dev, unsigned long *freq, u32 flags) | |
99 | { | |
100 | struct exynos_bus *bus = dev_get_drvdata(dev); | |
101 | struct dev_pm_opp *new_opp; | |
102 | unsigned long old_freq, new_freq, old_volt, new_volt, tol; | |
103 | int ret = 0; | |
104 | ||
105 | /* Get new opp-bus instance according to new bus clock */ | |
106 | rcu_read_lock(); | |
107 | new_opp = devfreq_recommended_opp(dev, freq, flags); | |
108 | if (IS_ERR(new_opp)) { | |
109 | dev_err(dev, "failed to get recommended opp instance\n"); | |
110 | rcu_read_unlock(); | |
111 | return PTR_ERR(new_opp); | |
112 | } | |
113 | ||
114 | new_freq = dev_pm_opp_get_freq(new_opp); | |
115 | new_volt = dev_pm_opp_get_voltage(new_opp); | |
116 | old_freq = dev_pm_opp_get_freq(bus->curr_opp); | |
117 | old_volt = dev_pm_opp_get_voltage(bus->curr_opp); | |
118 | rcu_read_unlock(); | |
119 | ||
120 | if (old_freq == new_freq) | |
121 | return 0; | |
122 | tol = new_volt * bus->voltage_tolerance / 100; | |
123 | ||
124 | /* Change voltage and frequency according to new OPP level */ | |
125 | mutex_lock(&bus->lock); | |
126 | ||
127 | if (old_freq < new_freq) { | |
128 | ret = regulator_set_voltage_tol(bus->regulator, new_volt, tol); | |
129 | if (ret < 0) { | |
130 | dev_err(bus->dev, "failed to set voltage\n"); | |
131 | goto out; | |
132 | } | |
133 | } | |
134 | ||
135 | ret = clk_set_rate(bus->clk, new_freq); | |
136 | if (ret < 0) { | |
137 | dev_err(dev, "failed to change clock of bus\n"); | |
138 | clk_set_rate(bus->clk, old_freq); | |
139 | goto out; | |
140 | } | |
141 | ||
142 | if (old_freq > new_freq) { | |
143 | ret = regulator_set_voltage_tol(bus->regulator, new_volt, tol); | |
144 | if (ret < 0) { | |
145 | dev_err(bus->dev, "failed to set voltage\n"); | |
146 | goto out; | |
147 | } | |
148 | } | |
149 | bus->curr_opp = new_opp; | |
150 | ||
151 | dev_dbg(dev, "Set the frequency of bus (%lukHz -> %lukHz)\n", | |
152 | old_freq/1000, new_freq/1000); | |
153 | out: | |
154 | mutex_unlock(&bus->lock); | |
155 | ||
156 | return ret; | |
157 | } | |
158 | ||
159 | static int exynos_bus_get_dev_status(struct device *dev, | |
160 | struct devfreq_dev_status *stat) | |
161 | { | |
162 | struct exynos_bus *bus = dev_get_drvdata(dev); | |
163 | struct devfreq_event_data edata; | |
164 | int ret; | |
165 | ||
166 | rcu_read_lock(); | |
167 | stat->current_frequency = dev_pm_opp_get_freq(bus->curr_opp); | |
168 | rcu_read_unlock(); | |
169 | ||
170 | ret = exynos_bus_get_event(bus, &edata); | |
171 | if (ret < 0) { | |
172 | stat->total_time = stat->busy_time = 0; | |
173 | goto err; | |
174 | } | |
175 | ||
176 | stat->busy_time = (edata.load_count * 100) / bus->ratio; | |
177 | stat->total_time = edata.total_count; | |
178 | ||
179 | dev_dbg(dev, "Usage of devfreq-event : %lu/%lu\n", stat->busy_time, | |
180 | stat->total_time); | |
181 | ||
182 | err: | |
183 | ret = exynos_bus_set_event(bus); | |
184 | if (ret < 0) { | |
185 | dev_err(dev, "failed to set event to devfreq-event devices\n"); | |
186 | return ret; | |
187 | } | |
188 | ||
189 | return ret; | |
190 | } | |
191 | ||
192 | static void exynos_bus_exit(struct device *dev) | |
193 | { | |
194 | struct exynos_bus *bus = dev_get_drvdata(dev); | |
195 | int ret; | |
196 | ||
197 | ret = exynos_bus_disable_edev(bus); | |
198 | if (ret < 0) | |
199 | dev_warn(dev, "failed to disable the devfreq-event devices\n"); | |
200 | ||
201 | if (bus->regulator) | |
202 | regulator_disable(bus->regulator); | |
203 | ||
204 | dev_pm_opp_of_remove_table(dev); | |
403e0689 | 205 | clk_disable_unprepare(bus->clk); |
0722249a CC |
206 | } |
207 | ||
403e0689 CC |
208 | /* |
209 | * Must necessary function for devfreq passive governor | |
210 | */ | |
211 | static int exynos_bus_passive_target(struct device *dev, unsigned long *freq, | |
212 | u32 flags) | |
0722249a | 213 | { |
403e0689 CC |
214 | struct exynos_bus *bus = dev_get_drvdata(dev); |
215 | struct dev_pm_opp *new_opp; | |
216 | unsigned long old_freq, new_freq; | |
217 | int ret = 0; | |
0722249a | 218 | |
403e0689 CC |
219 | /* Get new opp-bus instance according to new bus clock */ |
220 | rcu_read_lock(); | |
221 | new_opp = devfreq_recommended_opp(dev, freq, flags); | |
222 | if (IS_ERR(new_opp)) { | |
223 | dev_err(dev, "failed to get recommended opp instance\n"); | |
224 | rcu_read_unlock(); | |
225 | return PTR_ERR(new_opp); | |
0722249a CC |
226 | } |
227 | ||
403e0689 CC |
228 | new_freq = dev_pm_opp_get_freq(new_opp); |
229 | old_freq = dev_pm_opp_get_freq(bus->curr_opp); | |
230 | rcu_read_unlock(); | |
0722249a | 231 | |
403e0689 CC |
232 | if (old_freq == new_freq) |
233 | return 0; | |
234 | ||
235 | /* Change the frequency according to new OPP level */ | |
236 | mutex_lock(&bus->lock); | |
237 | ||
238 | ret = clk_set_rate(bus->clk, new_freq); | |
0722249a | 239 | if (ret < 0) { |
403e0689 CC |
240 | dev_err(dev, "failed to set the clock of bus\n"); |
241 | goto out; | |
0722249a CC |
242 | } |
243 | ||
403e0689 CC |
244 | *freq = new_freq; |
245 | bus->curr_opp = new_opp; | |
246 | ||
247 | dev_dbg(dev, "Set the frequency of bus (%lukHz -> %lukHz)\n", | |
248 | old_freq/1000, new_freq/1000); | |
249 | out: | |
250 | mutex_unlock(&bus->lock); | |
251 | ||
252 | return ret; | |
253 | } | |
254 | ||
255 | static void exynos_bus_passive_exit(struct device *dev) | |
256 | { | |
257 | struct exynos_bus *bus = dev_get_drvdata(dev); | |
258 | ||
259 | dev_pm_opp_of_remove_table(dev); | |
260 | clk_disable_unprepare(bus->clk); | |
261 | } | |
262 | ||
263 | static int exynos_bus_parent_parse_of(struct device_node *np, | |
264 | struct exynos_bus *bus) | |
265 | { | |
266 | struct device *dev = bus->dev; | |
267 | int i, ret, count, size; | |
0722249a CC |
268 | |
269 | /* Get the regulator to provide each bus with the power */ | |
270 | bus->regulator = devm_regulator_get(dev, "vdd"); | |
271 | if (IS_ERR(bus->regulator)) { | |
272 | dev_err(dev, "failed to get VDD regulator\n"); | |
403e0689 | 273 | return PTR_ERR(bus->regulator); |
0722249a CC |
274 | } |
275 | ||
276 | ret = regulator_enable(bus->regulator); | |
277 | if (ret < 0) { | |
278 | dev_err(dev, "failed to enable VDD regulator\n"); | |
403e0689 | 279 | return ret; |
0722249a CC |
280 | } |
281 | ||
282 | /* | |
283 | * Get the devfreq-event devices to get the current utilization of | |
284 | * buses. This raw data will be used in devfreq ondemand governor. | |
285 | */ | |
286 | count = devfreq_event_get_edev_count(dev); | |
287 | if (count < 0) { | |
288 | dev_err(dev, "failed to get the count of devfreq-event dev\n"); | |
289 | ret = count; | |
290 | goto err_regulator; | |
291 | } | |
292 | bus->edev_count = count; | |
293 | ||
294 | size = sizeof(*bus->edev) * count; | |
295 | bus->edev = devm_kzalloc(dev, size, GFP_KERNEL); | |
296 | if (!bus->edev) { | |
297 | ret = -ENOMEM; | |
298 | goto err_regulator; | |
299 | } | |
300 | ||
301 | for (i = 0; i < count; i++) { | |
302 | bus->edev[i] = devfreq_event_get_edev_by_phandle(dev, i); | |
303 | if (IS_ERR(bus->edev[i])) { | |
304 | ret = -EPROBE_DEFER; | |
305 | goto err_regulator; | |
306 | } | |
307 | } | |
308 | ||
309 | /* | |
310 | * Optionally, Get the saturation ratio according to Exynos SoC | |
311 | * When measuring the utilization of each AXI bus with devfreq-event | |
312 | * devices, the measured real cycle might be much lower than the | |
313 | * total cycle of bus during sampling rate. In result, the devfreq | |
314 | * simple-ondemand governor might not decide to change the current | |
315 | * frequency due to too utilization (= real cycle/total cycle). | |
316 | * So, this property is used to adjust the utilization when calculating | |
317 | * the busy_time in exynos_bus_get_dev_status(). | |
318 | */ | |
319 | if (of_property_read_u32(np, "exynos,saturation-ratio", &bus->ratio)) | |
320 | bus->ratio = DEFAULT_SATURATION_RATIO; | |
321 | ||
322 | if (of_property_read_u32(np, "exynos,voltage-tolerance", | |
323 | &bus->voltage_tolerance)) | |
324 | bus->voltage_tolerance = DEFAULT_VOLTAGE_TOLERANCE; | |
325 | ||
326 | return 0; | |
327 | ||
328 | err_regulator: | |
329 | regulator_disable(bus->regulator); | |
403e0689 CC |
330 | |
331 | return ret; | |
332 | } | |
333 | ||
334 | static int exynos_bus_parse_of(struct device_node *np, | |
335 | struct exynos_bus *bus) | |
336 | { | |
337 | struct device *dev = bus->dev; | |
338 | unsigned long rate; | |
339 | int ret; | |
340 | ||
341 | /* Get the clock to provide each bus with source clock */ | |
342 | bus->clk = devm_clk_get(dev, "bus"); | |
343 | if (IS_ERR(bus->clk)) { | |
344 | dev_err(dev, "failed to get bus clock\n"); | |
345 | return PTR_ERR(bus->clk); | |
346 | } | |
347 | ||
348 | ret = clk_prepare_enable(bus->clk); | |
349 | if (ret < 0) { | |
350 | dev_err(dev, "failed to get enable clock\n"); | |
351 | return ret; | |
352 | } | |
353 | ||
354 | /* Get the freq and voltage from OPP table to scale the bus freq */ | |
355 | rcu_read_lock(); | |
356 | ret = dev_pm_opp_of_add_table(dev); | |
357 | if (ret < 0) { | |
358 | dev_err(dev, "failed to get OPP table\n"); | |
359 | rcu_read_unlock(); | |
360 | goto err_clk; | |
361 | } | |
362 | ||
363 | rate = clk_get_rate(bus->clk); | |
364 | bus->curr_opp = devfreq_recommended_opp(dev, &rate, 0); | |
365 | if (IS_ERR(bus->curr_opp)) { | |
366 | dev_err(dev, "failed to find dev_pm_opp\n"); | |
367 | rcu_read_unlock(); | |
368 | ret = PTR_ERR(bus->curr_opp); | |
369 | goto err_opp; | |
370 | } | |
371 | rcu_read_unlock(); | |
372 | ||
373 | return 0; | |
374 | ||
0722249a CC |
375 | err_opp: |
376 | dev_pm_opp_of_remove_table(dev); | |
377 | err_clk: | |
378 | clk_disable_unprepare(bus->clk); | |
379 | ||
380 | return ret; | |
381 | } | |
382 | ||
383 | static int exynos_bus_probe(struct platform_device *pdev) | |
384 | { | |
385 | struct device *dev = &pdev->dev; | |
d8150d14 | 386 | struct device_node *np = dev->of_node, *node; |
0722249a CC |
387 | struct devfreq_dev_profile *profile; |
388 | struct devfreq_simple_ondemand_data *ondemand_data; | |
403e0689 CC |
389 | struct devfreq_passive_data *passive_data; |
390 | struct devfreq *parent_devfreq; | |
0722249a | 391 | struct exynos_bus *bus; |
403e0689 CC |
392 | int ret, max_state; |
393 | unsigned long min_freq, max_freq; | |
0722249a CC |
394 | |
395 | if (!np) { | |
396 | dev_err(dev, "failed to find devicetree node\n"); | |
397 | return -EINVAL; | |
398 | } | |
399 | ||
400 | bus = devm_kzalloc(&pdev->dev, sizeof(*bus), GFP_KERNEL); | |
401 | if (!bus) | |
402 | return -ENOMEM; | |
403 | mutex_init(&bus->lock); | |
404 | bus->dev = &pdev->dev; | |
405 | platform_set_drvdata(pdev, bus); | |
406 | ||
407 | /* Parse the device-tree to get the resource information */ | |
408 | ret = exynos_bus_parse_of(np, bus); | |
409 | if (ret < 0) | |
c07e074b | 410 | return ret; |
0722249a | 411 | |
0722249a | 412 | profile = devm_kzalloc(dev, sizeof(*profile), GFP_KERNEL); |
403e0689 CC |
413 | if (!profile) { |
414 | ret = -ENOMEM; | |
415 | goto err; | |
416 | } | |
417 | ||
d8150d14 PC |
418 | node = of_parse_phandle(dev->of_node, "devfreq", 0); |
419 | if (node) { | |
420 | of_node_put(node); | |
403e0689 | 421 | goto passive; |
d8150d14 | 422 | } else { |
403e0689 | 423 | ret = exynos_bus_parent_parse_of(np, bus); |
d8150d14 | 424 | } |
403e0689 CC |
425 | |
426 | if (ret < 0) | |
427 | goto err; | |
428 | ||
83cb0e4d | 429 | /* Initialize the struct profile and governor data for parent device */ |
0722249a CC |
430 | profile->polling_ms = 50; |
431 | profile->target = exynos_bus_target; | |
432 | profile->get_dev_status = exynos_bus_get_dev_status; | |
433 | profile->exit = exynos_bus_exit; | |
434 | ||
435 | ondemand_data = devm_kzalloc(dev, sizeof(*ondemand_data), GFP_KERNEL); | |
403e0689 CC |
436 | if (!ondemand_data) { |
437 | ret = -ENOMEM; | |
438 | goto err; | |
439 | } | |
0722249a CC |
440 | ondemand_data->upthreshold = 40; |
441 | ondemand_data->downdifferential = 5; | |
442 | ||
443 | /* Add devfreq device to monitor and handle the exynos bus */ | |
444 | bus->devfreq = devm_devfreq_add_device(dev, profile, "simple_ondemand", | |
445 | ondemand_data); | |
446 | if (IS_ERR(bus->devfreq)) { | |
447 | dev_err(dev, "failed to add devfreq device\n"); | |
403e0689 CC |
448 | ret = PTR_ERR(bus->devfreq); |
449 | goto err; | |
0722249a CC |
450 | } |
451 | ||
452 | /* Register opp_notifier to catch the change of OPP */ | |
453 | ret = devm_devfreq_register_opp_notifier(dev, bus->devfreq); | |
454 | if (ret < 0) { | |
455 | dev_err(dev, "failed to register opp notifier\n"); | |
403e0689 | 456 | goto err; |
0722249a CC |
457 | } |
458 | ||
459 | /* | |
460 | * Enable devfreq-event to get raw data which is used to determine | |
461 | * current bus load. | |
462 | */ | |
463 | ret = exynos_bus_enable_edev(bus); | |
464 | if (ret < 0) { | |
465 | dev_err(dev, "failed to enable devfreq-event devices\n"); | |
403e0689 | 466 | goto err; |
0722249a CC |
467 | } |
468 | ||
469 | ret = exynos_bus_set_event(bus); | |
470 | if (ret < 0) { | |
471 | dev_err(dev, "failed to set event to devfreq-event devices\n"); | |
403e0689 | 472 | goto err; |
0722249a CC |
473 | } |
474 | ||
403e0689 CC |
475 | goto out; |
476 | passive: | |
83cb0e4d | 477 | /* Initialize the struct profile and governor data for passive device */ |
403e0689 CC |
478 | profile->target = exynos_bus_passive_target; |
479 | profile->exit = exynos_bus_passive_exit; | |
480 | ||
481 | /* Get the instance of parent devfreq device */ | |
482 | parent_devfreq = devfreq_get_devfreq_by_phandle(dev, 0); | |
483 | if (IS_ERR(parent_devfreq)) { | |
484 | ret = -EPROBE_DEFER; | |
485 | goto err; | |
486 | } | |
487 | ||
488 | passive_data = devm_kzalloc(dev, sizeof(*passive_data), GFP_KERNEL); | |
489 | if (!passive_data) { | |
490 | ret = -ENOMEM; | |
491 | goto err; | |
492 | } | |
493 | passive_data->parent = parent_devfreq; | |
494 | ||
495 | /* Add devfreq device for exynos bus with passive governor */ | |
496 | bus->devfreq = devm_devfreq_add_device(dev, profile, "passive", | |
497 | passive_data); | |
498 | if (IS_ERR(bus->devfreq)) { | |
499 | dev_err(dev, | |
500 | "failed to add devfreq dev with passive governor\n"); | |
501 | ret = -EPROBE_DEFER; | |
502 | goto err; | |
503 | } | |
504 | ||
505 | out: | |
506 | max_state = bus->devfreq->profile->max_state; | |
507 | min_freq = (bus->devfreq->profile->freq_table[0] / 1000); | |
508 | max_freq = (bus->devfreq->profile->freq_table[max_state - 1] / 1000); | |
509 | pr_info("exynos-bus: new bus device registered: %s (%6ld KHz ~ %6ld KHz)\n", | |
510 | dev_name(dev), min_freq, max_freq); | |
511 | ||
0722249a | 512 | return 0; |
403e0689 CC |
513 | |
514 | err: | |
515 | dev_pm_opp_of_remove_table(dev); | |
516 | clk_disable_unprepare(bus->clk); | |
517 | ||
518 | return ret; | |
0722249a CC |
519 | } |
520 | ||
521 | #ifdef CONFIG_PM_SLEEP | |
522 | static int exynos_bus_resume(struct device *dev) | |
523 | { | |
524 | struct exynos_bus *bus = dev_get_drvdata(dev); | |
525 | int ret; | |
526 | ||
527 | ret = exynos_bus_enable_edev(bus); | |
528 | if (ret < 0) { | |
529 | dev_err(dev, "failed to enable the devfreq-event devices\n"); | |
530 | return ret; | |
531 | } | |
532 | ||
533 | return 0; | |
534 | } | |
535 | ||
536 | static int exynos_bus_suspend(struct device *dev) | |
537 | { | |
538 | struct exynos_bus *bus = dev_get_drvdata(dev); | |
539 | int ret; | |
540 | ||
541 | ret = exynos_bus_disable_edev(bus); | |
542 | if (ret < 0) { | |
543 | dev_err(dev, "failed to disable the devfreq-event devices\n"); | |
544 | return ret; | |
545 | } | |
546 | ||
547 | return 0; | |
548 | } | |
549 | #endif | |
550 | ||
551 | static const struct dev_pm_ops exynos_bus_pm = { | |
552 | SET_SYSTEM_SLEEP_PM_OPS(exynos_bus_suspend, exynos_bus_resume) | |
553 | }; | |
554 | ||
555 | static const struct of_device_id exynos_bus_of_match[] = { | |
556 | { .compatible = "samsung,exynos-bus", }, | |
557 | { /* sentinel */ }, | |
558 | }; | |
559 | MODULE_DEVICE_TABLE(of, exynos_bus_of_match); | |
560 | ||
561 | static struct platform_driver exynos_bus_platdrv = { | |
562 | .probe = exynos_bus_probe, | |
563 | .driver = { | |
564 | .name = "exynos-bus", | |
565 | .pm = &exynos_bus_pm, | |
566 | .of_match_table = of_match_ptr(exynos_bus_of_match), | |
567 | }, | |
568 | }; | |
569 | module_platform_driver(exynos_bus_platdrv); | |
570 | ||
571 | MODULE_DESCRIPTION("Generic Exynos Bus frequency driver"); | |
572 | MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>"); | |
573 | MODULE_LICENSE("GPL v2"); |