Version:  2.0.40 2.2.26 2.4.37 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16

Linux/drivers/gpu/drm/tilcdc/tilcdc_drv.c

  1 /*
  2  * Copyright (C) 2012 Texas Instruments
  3  * Author: Rob Clark <robdclark@gmail.com>
  4  *
  5  * This program is free software; you can redistribute it and/or modify it
  6  * under the terms of the GNU General Public License version 2 as published by
  7  * the Free Software Foundation.
  8  *
  9  * This program is distributed in the hope that it will be useful, but WITHOUT
 10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 12  * more details.
 13  *
 14  * You should have received a copy of the GNU General Public License along with
 15  * this program.  If not, see <http://www.gnu.org/licenses/>.
 16  */
 17 
 18 /* LCDC DRM driver, based on da8xx-fb */
 19 
 20 #include "tilcdc_drv.h"
 21 #include "tilcdc_regs.h"
 22 #include "tilcdc_tfp410.h"
 23 #include "tilcdc_slave.h"
 24 #include "tilcdc_panel.h"
 25 
 26 #include "drm_fb_helper.h"
 27 
 28 static LIST_HEAD(module_list);
 29 static bool slave_probing;
 30 
 31 void tilcdc_module_init(struct tilcdc_module *mod, const char *name,
 32                 const struct tilcdc_module_ops *funcs)
 33 {
 34         mod->name = name;
 35         mod->funcs = funcs;
 36         INIT_LIST_HEAD(&mod->list);
 37         list_add(&mod->list, &module_list);
 38 }
 39 
 40 void tilcdc_module_cleanup(struct tilcdc_module *mod)
 41 {
 42         list_del(&mod->list);
 43 }
 44 
 45 void tilcdc_slave_probedefer(bool defered)
 46 {
 47         slave_probing = defered;
 48 }
 49 
 50 static struct of_device_id tilcdc_of_match[];
 51 
 52 static struct drm_framebuffer *tilcdc_fb_create(struct drm_device *dev,
 53                 struct drm_file *file_priv, struct drm_mode_fb_cmd2 *mode_cmd)
 54 {
 55         return drm_fb_cma_create(dev, file_priv, mode_cmd);
 56 }
 57 
 58 static void tilcdc_fb_output_poll_changed(struct drm_device *dev)
 59 {
 60         struct tilcdc_drm_private *priv = dev->dev_private;
 61         if (priv->fbdev)
 62                 drm_fbdev_cma_hotplug_event(priv->fbdev);
 63 }
 64 
 65 static const struct drm_mode_config_funcs mode_config_funcs = {
 66         .fb_create = tilcdc_fb_create,
 67         .output_poll_changed = tilcdc_fb_output_poll_changed,
 68 };
 69 
 70 static int modeset_init(struct drm_device *dev)
 71 {
 72         struct tilcdc_drm_private *priv = dev->dev_private;
 73         struct tilcdc_module *mod;
 74 
 75         drm_mode_config_init(dev);
 76 
 77         priv->crtc = tilcdc_crtc_create(dev);
 78 
 79         list_for_each_entry(mod, &module_list, list) {
 80                 DBG("loading module: %s", mod->name);
 81                 mod->funcs->modeset_init(mod, dev);
 82         }
 83 
 84         if ((priv->num_encoders == 0) || (priv->num_connectors == 0)) {
 85                 /* oh nos! */
 86                 dev_err(dev->dev, "no encoders/connectors found\n");
 87                 return -ENXIO;
 88         }
 89 
 90         dev->mode_config.min_width = 0;
 91         dev->mode_config.min_height = 0;
 92         dev->mode_config.max_width = tilcdc_crtc_max_width(priv->crtc);
 93         dev->mode_config.max_height = 2048;
 94         dev->mode_config.funcs = &mode_config_funcs;
 95 
 96         return 0;
 97 }
 98 
 99 #ifdef CONFIG_CPU_FREQ
100 static int cpufreq_transition(struct notifier_block *nb,
101                                      unsigned long val, void *data)
102 {
103         struct tilcdc_drm_private *priv = container_of(nb,
104                         struct tilcdc_drm_private, freq_transition);
105         if (val == CPUFREQ_POSTCHANGE) {
106                 if (priv->lcd_fck_rate != clk_get_rate(priv->clk)) {
107                         priv->lcd_fck_rate = clk_get_rate(priv->clk);
108                         tilcdc_crtc_update_clk(priv->crtc);
109                 }
110         }
111 
112         return 0;
113 }
114 #endif
115 
116 /*
117  * DRM operations:
118  */
119 
120 static int tilcdc_unload(struct drm_device *dev)
121 {
122         struct tilcdc_drm_private *priv = dev->dev_private;
123         struct tilcdc_module *mod, *cur;
124 
125         drm_kms_helper_poll_fini(dev);
126         drm_mode_config_cleanup(dev);
127         drm_vblank_cleanup(dev);
128 
129         pm_runtime_get_sync(dev->dev);
130         drm_irq_uninstall(dev);
131         pm_runtime_put_sync(dev->dev);
132 
133 #ifdef CONFIG_CPU_FREQ
134         cpufreq_unregister_notifier(&priv->freq_transition,
135                         CPUFREQ_TRANSITION_NOTIFIER);
136 #endif
137 
138         if (priv->clk)
139                 clk_put(priv->clk);
140 
141         if (priv->mmio)
142                 iounmap(priv->mmio);
143 
144         flush_workqueue(priv->wq);
145         destroy_workqueue(priv->wq);
146 
147         dev->dev_private = NULL;
148 
149         pm_runtime_disable(dev->dev);
150 
151         list_for_each_entry_safe(mod, cur, &module_list, list) {
152                 DBG("destroying module: %s", mod->name);
153                 mod->funcs->destroy(mod);
154         }
155 
156         kfree(priv);
157 
158         return 0;
159 }
160 
161 static int tilcdc_load(struct drm_device *dev, unsigned long flags)
162 {
163         struct platform_device *pdev = dev->platformdev;
164         struct device_node *node = pdev->dev.of_node;
165         struct tilcdc_drm_private *priv;
166         struct tilcdc_module *mod;
167         struct resource *res;
168         u32 bpp = 0;
169         int ret;
170 
171         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
172         if (!priv) {
173                 dev_err(dev->dev, "failed to allocate private data\n");
174                 return -ENOMEM;
175         }
176 
177         dev->dev_private = priv;
178 
179         priv->wq = alloc_ordered_workqueue("tilcdc", 0);
180 
181         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
182         if (!res) {
183                 dev_err(dev->dev, "failed to get memory resource\n");
184                 ret = -EINVAL;
185                 goto fail;
186         }
187 
188         priv->mmio = ioremap_nocache(res->start, resource_size(res));
189         if (!priv->mmio) {
190                 dev_err(dev->dev, "failed to ioremap\n");
191                 ret = -ENOMEM;
192                 goto fail;
193         }
194 
195         priv->clk = clk_get(dev->dev, "fck");
196         if (IS_ERR(priv->clk)) {
197                 dev_err(dev->dev, "failed to get functional clock\n");
198                 ret = -ENODEV;
199                 goto fail;
200         }
201 
202         priv->disp_clk = clk_get(dev->dev, "dpll_disp_ck");
203         if (IS_ERR(priv->clk)) {
204                 dev_err(dev->dev, "failed to get display clock\n");
205                 ret = -ENODEV;
206                 goto fail;
207         }
208 
209 #ifdef CONFIG_CPU_FREQ
210         priv->lcd_fck_rate = clk_get_rate(priv->clk);
211         priv->freq_transition.notifier_call = cpufreq_transition;
212         ret = cpufreq_register_notifier(&priv->freq_transition,
213                         CPUFREQ_TRANSITION_NOTIFIER);
214         if (ret) {
215                 dev_err(dev->dev, "failed to register cpufreq notifier\n");
216                 goto fail;
217         }
218 #endif
219 
220         if (of_property_read_u32(node, "max-bandwidth", &priv->max_bandwidth))
221                 priv->max_bandwidth = TILCDC_DEFAULT_MAX_BANDWIDTH;
222 
223         DBG("Maximum Bandwidth Value %d", priv->max_bandwidth);
224 
225         if (of_property_read_u32(node, "ti,max-width", &priv->max_width))
226                 priv->max_width = TILCDC_DEFAULT_MAX_WIDTH;
227 
228         DBG("Maximum Horizontal Pixel Width Value %dpixels", priv->max_width);
229 
230         if (of_property_read_u32(node, "ti,max-pixelclock",
231                                         &priv->max_pixelclock))
232                 priv->max_pixelclock = TILCDC_DEFAULT_MAX_PIXELCLOCK;
233 
234         DBG("Maximum Pixel Clock Value %dKHz", priv->max_pixelclock);
235 
236         pm_runtime_enable(dev->dev);
237 
238         /* Determine LCD IP Version */
239         pm_runtime_get_sync(dev->dev);
240         switch (tilcdc_read(dev, LCDC_PID_REG)) {
241         case 0x4c100102:
242                 priv->rev = 1;
243                 break;
244         case 0x4f200800:
245         case 0x4f201000:
246                 priv->rev = 2;
247                 break;
248         default:
249                 dev_warn(dev->dev, "Unknown PID Reg value 0x%08x, "
250                                 "defaulting to LCD revision 1\n",
251                                 tilcdc_read(dev, LCDC_PID_REG));
252                 priv->rev = 1;
253                 break;
254         }
255 
256         pm_runtime_put_sync(dev->dev);
257 
258         ret = modeset_init(dev);
259         if (ret < 0) {
260                 dev_err(dev->dev, "failed to initialize mode setting\n");
261                 goto fail;
262         }
263 
264         ret = drm_vblank_init(dev, 1);
265         if (ret < 0) {
266                 dev_err(dev->dev, "failed to initialize vblank\n");
267                 goto fail;
268         }
269 
270         pm_runtime_get_sync(dev->dev);
271         ret = drm_irq_install(dev, platform_get_irq(dev->platformdev, 0));
272         pm_runtime_put_sync(dev->dev);
273         if (ret < 0) {
274                 dev_err(dev->dev, "failed to install IRQ handler\n");
275                 goto fail;
276         }
277 
278         platform_set_drvdata(pdev, dev);
279 
280 
281         list_for_each_entry(mod, &module_list, list) {
282                 DBG("%s: preferred_bpp: %d", mod->name, mod->preferred_bpp);
283                 bpp = mod->preferred_bpp;
284                 if (bpp > 0)
285                         break;
286         }
287 
288         priv->fbdev = drm_fbdev_cma_init(dev, bpp,
289                         dev->mode_config.num_crtc,
290                         dev->mode_config.num_connector);
291 
292         drm_kms_helper_poll_init(dev);
293 
294         return 0;
295 
296 fail:
297         tilcdc_unload(dev);
298         return ret;
299 }
300 
301 static void tilcdc_preclose(struct drm_device *dev, struct drm_file *file)
302 {
303         struct tilcdc_drm_private *priv = dev->dev_private;
304 
305         tilcdc_crtc_cancel_page_flip(priv->crtc, file);
306 }
307 
308 static void tilcdc_lastclose(struct drm_device *dev)
309 {
310         struct tilcdc_drm_private *priv = dev->dev_private;
311         drm_fbdev_cma_restore_mode(priv->fbdev);
312 }
313 
314 static irqreturn_t tilcdc_irq(int irq, void *arg)
315 {
316         struct drm_device *dev = arg;
317         struct tilcdc_drm_private *priv = dev->dev_private;
318         return tilcdc_crtc_irq(priv->crtc);
319 }
320 
321 static void tilcdc_irq_preinstall(struct drm_device *dev)
322 {
323         tilcdc_clear_irqstatus(dev, 0xffffffff);
324 }
325 
326 static int tilcdc_irq_postinstall(struct drm_device *dev)
327 {
328         struct tilcdc_drm_private *priv = dev->dev_private;
329 
330         /* enable FIFO underflow irq: */
331         if (priv->rev == 1)
332                 tilcdc_set(dev, LCDC_RASTER_CTRL_REG, LCDC_V1_UNDERFLOW_INT_ENA);
333         else
334                 tilcdc_set(dev, LCDC_INT_ENABLE_SET_REG, LCDC_V2_UNDERFLOW_INT_ENA);
335 
336         return 0;
337 }
338 
339 static void tilcdc_irq_uninstall(struct drm_device *dev)
340 {
341         struct tilcdc_drm_private *priv = dev->dev_private;
342 
343         /* disable irqs that we might have enabled: */
344         if (priv->rev == 1) {
345                 tilcdc_clear(dev, LCDC_RASTER_CTRL_REG,
346                                 LCDC_V1_UNDERFLOW_INT_ENA | LCDC_V1_PL_INT_ENA);
347                 tilcdc_clear(dev, LCDC_DMA_CTRL_REG, LCDC_V1_END_OF_FRAME_INT_ENA);
348         } else {
349                 tilcdc_clear(dev, LCDC_INT_ENABLE_SET_REG,
350                         LCDC_V2_UNDERFLOW_INT_ENA | LCDC_V2_PL_INT_ENA |
351                         LCDC_V2_END_OF_FRAME0_INT_ENA | LCDC_V2_END_OF_FRAME1_INT_ENA |
352                         LCDC_FRAME_DONE);
353         }
354 
355 }
356 
357 static void enable_vblank(struct drm_device *dev, bool enable)
358 {
359         struct tilcdc_drm_private *priv = dev->dev_private;
360         u32 reg, mask;
361 
362         if (priv->rev == 1) {
363                 reg = LCDC_DMA_CTRL_REG;
364                 mask = LCDC_V1_END_OF_FRAME_INT_ENA;
365         } else {
366                 reg = LCDC_INT_ENABLE_SET_REG;
367                 mask = LCDC_V2_END_OF_FRAME0_INT_ENA |
368                         LCDC_V2_END_OF_FRAME1_INT_ENA | LCDC_FRAME_DONE;
369         }
370 
371         if (enable)
372                 tilcdc_set(dev, reg, mask);
373         else
374                 tilcdc_clear(dev, reg, mask);
375 }
376 
377 static int tilcdc_enable_vblank(struct drm_device *dev, int crtc)
378 {
379         enable_vblank(dev, true);
380         return 0;
381 }
382 
383 static void tilcdc_disable_vblank(struct drm_device *dev, int crtc)
384 {
385         enable_vblank(dev, false);
386 }
387 
388 #if defined(CONFIG_DEBUG_FS) || defined(CONFIG_PM_SLEEP)
389 static const struct {
390         const char *name;
391         uint8_t  rev;
392         uint8_t  save;
393         uint32_t reg;
394 } registers[] =         {
395 #define REG(rev, save, reg) { #reg, rev, save, reg }
396                 /* exists in revision 1: */
397                 REG(1, false, LCDC_PID_REG),
398                 REG(1, true,  LCDC_CTRL_REG),
399                 REG(1, false, LCDC_STAT_REG),
400                 REG(1, true,  LCDC_RASTER_CTRL_REG),
401                 REG(1, true,  LCDC_RASTER_TIMING_0_REG),
402                 REG(1, true,  LCDC_RASTER_TIMING_1_REG),
403                 REG(1, true,  LCDC_RASTER_TIMING_2_REG),
404                 REG(1, true,  LCDC_DMA_CTRL_REG),
405                 REG(1, true,  LCDC_DMA_FB_BASE_ADDR_0_REG),
406                 REG(1, true,  LCDC_DMA_FB_CEILING_ADDR_0_REG),
407                 REG(1, true,  LCDC_DMA_FB_BASE_ADDR_1_REG),
408                 REG(1, true,  LCDC_DMA_FB_CEILING_ADDR_1_REG),
409                 /* new in revision 2: */
410                 REG(2, false, LCDC_RAW_STAT_REG),
411                 REG(2, false, LCDC_MASKED_STAT_REG),
412                 REG(2, false, LCDC_INT_ENABLE_SET_REG),
413                 REG(2, false, LCDC_INT_ENABLE_CLR_REG),
414                 REG(2, false, LCDC_END_OF_INT_IND_REG),
415                 REG(2, true,  LCDC_CLK_ENABLE_REG),
416                 REG(2, true,  LCDC_INT_ENABLE_SET_REG),
417 #undef REG
418 };
419 #endif
420 
421 #ifdef CONFIG_DEBUG_FS
422 static int tilcdc_regs_show(struct seq_file *m, void *arg)
423 {
424         struct drm_info_node *node = (struct drm_info_node *) m->private;
425         struct drm_device *dev = node->minor->dev;
426         struct tilcdc_drm_private *priv = dev->dev_private;
427         unsigned i;
428 
429         pm_runtime_get_sync(dev->dev);
430 
431         seq_printf(m, "revision: %d\n", priv->rev);
432 
433         for (i = 0; i < ARRAY_SIZE(registers); i++)
434                 if (priv->rev >= registers[i].rev)
435                         seq_printf(m, "%s:\t %08x\n", registers[i].name,
436                                         tilcdc_read(dev, registers[i].reg));
437 
438         pm_runtime_put_sync(dev->dev);
439 
440         return 0;
441 }
442 
443 static int tilcdc_mm_show(struct seq_file *m, void *arg)
444 {
445         struct drm_info_node *node = (struct drm_info_node *) m->private;
446         struct drm_device *dev = node->minor->dev;
447         return drm_mm_dump_table(m, &dev->vma_offset_manager->vm_addr_space_mm);
448 }
449 
450 static struct drm_info_list tilcdc_debugfs_list[] = {
451                 { "regs", tilcdc_regs_show, 0 },
452                 { "mm",   tilcdc_mm_show,   0 },
453                 { "fb",   drm_fb_cma_debugfs_show, 0 },
454 };
455 
456 static int tilcdc_debugfs_init(struct drm_minor *minor)
457 {
458         struct drm_device *dev = minor->dev;
459         struct tilcdc_module *mod;
460         int ret;
461 
462         ret = drm_debugfs_create_files(tilcdc_debugfs_list,
463                         ARRAY_SIZE(tilcdc_debugfs_list),
464                         minor->debugfs_root, minor);
465 
466         list_for_each_entry(mod, &module_list, list)
467                 if (mod->funcs->debugfs_init)
468                         mod->funcs->debugfs_init(mod, minor);
469 
470         if (ret) {
471                 dev_err(dev->dev, "could not install tilcdc_debugfs_list\n");
472                 return ret;
473         }
474 
475         return ret;
476 }
477 
478 static void tilcdc_debugfs_cleanup(struct drm_minor *minor)
479 {
480         struct tilcdc_module *mod;
481         drm_debugfs_remove_files(tilcdc_debugfs_list,
482                         ARRAY_SIZE(tilcdc_debugfs_list), minor);
483 
484         list_for_each_entry(mod, &module_list, list)
485                 if (mod->funcs->debugfs_cleanup)
486                         mod->funcs->debugfs_cleanup(mod, minor);
487 }
488 #endif
489 
490 static const struct file_operations fops = {
491         .owner              = THIS_MODULE,
492         .open               = drm_open,
493         .release            = drm_release,
494         .unlocked_ioctl     = drm_ioctl,
495 #ifdef CONFIG_COMPAT
496         .compat_ioctl       = drm_compat_ioctl,
497 #endif
498         .poll               = drm_poll,
499         .read               = drm_read,
500         .llseek             = no_llseek,
501         .mmap               = drm_gem_cma_mmap,
502 };
503 
504 static struct drm_driver tilcdc_driver = {
505         .driver_features    = DRIVER_HAVE_IRQ | DRIVER_GEM | DRIVER_MODESET,
506         .load               = tilcdc_load,
507         .unload             = tilcdc_unload,
508         .preclose           = tilcdc_preclose,
509         .lastclose          = tilcdc_lastclose,
510         .irq_handler        = tilcdc_irq,
511         .irq_preinstall     = tilcdc_irq_preinstall,
512         .irq_postinstall    = tilcdc_irq_postinstall,
513         .irq_uninstall      = tilcdc_irq_uninstall,
514         .get_vblank_counter = drm_vblank_count,
515         .enable_vblank      = tilcdc_enable_vblank,
516         .disable_vblank     = tilcdc_disable_vblank,
517         .gem_free_object    = drm_gem_cma_free_object,
518         .gem_vm_ops         = &drm_gem_cma_vm_ops,
519         .dumb_create        = drm_gem_cma_dumb_create,
520         .dumb_map_offset    = drm_gem_cma_dumb_map_offset,
521         .dumb_destroy       = drm_gem_dumb_destroy,
522 #ifdef CONFIG_DEBUG_FS
523         .debugfs_init       = tilcdc_debugfs_init,
524         .debugfs_cleanup    = tilcdc_debugfs_cleanup,
525 #endif
526         .fops               = &fops,
527         .name               = "tilcdc",
528         .desc               = "TI LCD Controller DRM",
529         .date               = "20121205",
530         .major              = 1,
531         .minor              = 0,
532 };
533 
534 /*
535  * Power management:
536  */
537 
538 #ifdef CONFIG_PM_SLEEP
539 static int tilcdc_pm_suspend(struct device *dev)
540 {
541         struct drm_device *ddev = dev_get_drvdata(dev);
542         struct tilcdc_drm_private *priv = ddev->dev_private;
543         unsigned i, n = 0;
544 
545         drm_kms_helper_poll_disable(ddev);
546 
547         /* Save register state: */
548         for (i = 0; i < ARRAY_SIZE(registers); i++)
549                 if (registers[i].save && (priv->rev >= registers[i].rev))
550                         priv->saved_register[n++] = tilcdc_read(ddev, registers[i].reg);
551 
552         return 0;
553 }
554 
555 static int tilcdc_pm_resume(struct device *dev)
556 {
557         struct drm_device *ddev = dev_get_drvdata(dev);
558         struct tilcdc_drm_private *priv = ddev->dev_private;
559         unsigned i, n = 0;
560 
561         /* Restore register state: */
562         for (i = 0; i < ARRAY_SIZE(registers); i++)
563                 if (registers[i].save && (priv->rev >= registers[i].rev))
564                         tilcdc_write(ddev, registers[i].reg, priv->saved_register[n++]);
565 
566         drm_kms_helper_poll_enable(ddev);
567 
568         return 0;
569 }
570 #endif
571 
572 static const struct dev_pm_ops tilcdc_pm_ops = {
573         SET_SYSTEM_SLEEP_PM_OPS(tilcdc_pm_suspend, tilcdc_pm_resume)
574 };
575 
576 /*
577  * Platform driver:
578  */
579 
580 static int tilcdc_pdev_probe(struct platform_device *pdev)
581 {
582         /* bail out early if no DT data: */
583         if (!pdev->dev.of_node) {
584                 dev_err(&pdev->dev, "device-tree data is missing\n");
585                 return -ENXIO;
586         }
587 
588         /* defer probing if slave is in deferred probing */
589         if (slave_probing == true)
590                 return -EPROBE_DEFER;
591 
592         return drm_platform_init(&tilcdc_driver, pdev);
593 }
594 
595 static int tilcdc_pdev_remove(struct platform_device *pdev)
596 {
597         drm_put_dev(platform_get_drvdata(pdev));
598 
599         return 0;
600 }
601 
602 static struct of_device_id tilcdc_of_match[] = {
603                 { .compatible = "ti,am33xx-tilcdc", },
604                 { },
605 };
606 MODULE_DEVICE_TABLE(of, tilcdc_of_match);
607 
608 static struct platform_driver tilcdc_platform_driver = {
609         .probe      = tilcdc_pdev_probe,
610         .remove     = tilcdc_pdev_remove,
611         .driver     = {
612                 .owner  = THIS_MODULE,
613                 .name   = "tilcdc",
614                 .pm     = &tilcdc_pm_ops,
615                 .of_match_table = tilcdc_of_match,
616         },
617 };
618 
619 static int __init tilcdc_drm_init(void)
620 {
621         DBG("init");
622         tilcdc_tfp410_init();
623         tilcdc_slave_init();
624         tilcdc_panel_init();
625         return platform_driver_register(&tilcdc_platform_driver);
626 }
627 
628 static void __exit tilcdc_drm_fini(void)
629 {
630         DBG("fini");
631         tilcdc_tfp410_fini();
632         tilcdc_slave_fini();
633         tilcdc_panel_fini();
634         platform_driver_unregister(&tilcdc_platform_driver);
635 }
636 
637 late_initcall(tilcdc_drm_init);
638 module_exit(tilcdc_drm_fini);
639 
640 MODULE_AUTHOR("Rob Clark <robdclark@gmail.com");
641 MODULE_DESCRIPTION("TI LCD Controller DRM Driver");
642 MODULE_LICENSE("GPL");
643 

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