blob: 035dacc93382f0923a9d52c645a70cc192a6756e [file] [log] [blame]
Dave Airlie312fec12012-02-29 13:40:04 +00001/*
2 * Copyright 2012 Red Hat Inc.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the
6 * "Software"), to deal in the Software without restriction, including
7 * without limitation the rights to use, copy, modify, merge, publish,
8 * distribute, sub license, and/or sell copies of the Software, and to
9 * permit persons to whom the Software is furnished to do so, subject to
10 * the following conditions:
11 *
12 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
13 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
14 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
15 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
16 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
17 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
18 * USE OR OTHER DEALINGS IN THE SOFTWARE.
19 *
20 * The above copyright notice and this permission notice (including the
21 * next paragraph) shall be included in all copies or substantial portions
22 * of the Software.
23 *
24 */
25/*
26 * Authors: Dave Airlie <airlied@redhat.com>
27 */
David Howells760285e2012-10-02 18:01:07 +010028#include <drm/drmP.h>
Dave Airlie312fec12012-02-29 13:40:04 +000029#include "ast_drv.h"
30
31
David Howells760285e2012-10-02 18:01:07 +010032#include <drm/drm_fb_helper.h>
33#include <drm/drm_crtc_helper.h>
Dave Airlie312fec12012-02-29 13:40:04 +000034
35#include "ast_dram_tables.h"
36
37void ast_set_index_reg_mask(struct ast_private *ast,
38 uint32_t base, uint8_t index,
39 uint8_t mask, uint8_t val)
40{
41 u8 tmp;
42 ast_io_write8(ast, base, index);
43 tmp = (ast_io_read8(ast, base + 1) & mask) | val;
44 ast_set_index_reg(ast, base, index, tmp);
45}
46
47uint8_t ast_get_index_reg(struct ast_private *ast,
48 uint32_t base, uint8_t index)
49{
50 uint8_t ret;
51 ast_io_write8(ast, base, index);
52 ret = ast_io_read8(ast, base + 1);
53 return ret;
54}
55
56uint8_t ast_get_index_reg_mask(struct ast_private *ast,
57 uint32_t base, uint8_t index, uint8_t mask)
58{
59 uint8_t ret;
60 ast_io_write8(ast, base, index);
61 ret = ast_io_read8(ast, base + 1) & mask;
62 return ret;
63}
64
65
Benjamin Herrenschmidtd1b98552014-09-04 17:50:11 +100066static int ast_detect_chip(struct drm_device *dev, bool *need_post)
Dave Airlie312fec12012-02-29 13:40:04 +000067{
68 struct ast_private *ast = dev->dev_private;
Dave Airlief1f62f22014-01-17 10:56:09 +100069 uint32_t data, jreg;
Y.C. Chen8f372e22014-09-10 12:07:53 +080070 ast_open_key(ast);
Dave Airlie312fec12012-02-29 13:40:04 +000071
72 if (dev->pdev->device == PCI_CHIP_AST1180) {
73 ast->chip = AST1100;
74 DRM_INFO("AST 1180 detected\n");
75 } else {
Dave Airlie1453bf42014-03-28 09:18:45 +100076 if (dev->pdev->revision >= 0x30) {
77 ast->chip = AST2400;
78 DRM_INFO("AST 2400 detected\n");
79 } else if (dev->pdev->revision >= 0x20) {
Dave Airlie312fec12012-02-29 13:40:04 +000080 ast->chip = AST2300;
81 DRM_INFO("AST 2300 detected\n");
82 } else if (dev->pdev->revision >= 0x10) {
83 uint32_t data;
84 ast_write32(ast, 0xf004, 0x1e6e0000);
85 ast_write32(ast, 0xf000, 0x1);
86
87 data = ast_read32(ast, 0x1207c);
88 switch (data & 0x0300) {
89 case 0x0200:
90 ast->chip = AST1100;
91 DRM_INFO("AST 1100 detected\n");
92 break;
93 case 0x0100:
94 ast->chip = AST2200;
95 DRM_INFO("AST 2200 detected\n");
96 break;
97 case 0x0000:
98 ast->chip = AST2150;
99 DRM_INFO("AST 2150 detected\n");
100 break;
101 default:
102 ast->chip = AST2100;
103 DRM_INFO("AST 2100 detected\n");
104 break;
105 }
106 ast->vga2_clone = false;
107 } else {
Y.C. Chen83502a52014-09-10 12:07:54 +0800108 ast->chip = AST2000;
Dave Airlie312fec12012-02-29 13:40:04 +0000109 DRM_INFO("AST 2000 detected\n");
110 }
111 }
Dave Airlief1f62f22014-01-17 10:56:09 +1000112
Benjamin Herrenschmidtd1b98552014-09-04 17:50:11 +1000113 /*
114 * If VGA isn't enabled, we need to enable now or subsequent
115 * access to the scratch registers will fail. We also inform
116 * our caller that it needs to POST the chip
117 * (Assumption: VGA not enabled -> need to POST)
118 */
119 if (!ast_is_vga_enabled(dev)) {
120 ast_enable_vga(dev);
121 ast_enable_mmio(dev);
122 DRM_INFO("VGA not enabled on entry, requesting chip POST\n");
123 *need_post = true;
124 } else
125 *need_post = false;
126
127 /* Check if we support wide screen */
Dave Airlief1f62f22014-01-17 10:56:09 +1000128 switch (ast->chip) {
129 case AST1180:
130 ast->support_wide_screen = true;
131 break;
132 case AST2000:
133 ast->support_wide_screen = false;
134 break;
135 default:
136 jreg = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xd0, 0xff);
137 if (!(jreg & 0x80))
138 ast->support_wide_screen = true;
139 else if (jreg & 0x01)
140 ast->support_wide_screen = true;
141 else {
142 ast->support_wide_screen = false;
Benjamin Herrenschmidtd1b98552014-09-04 17:50:11 +1000143 /* Read SCU7c (silicon revision register) */
Dave Airlie1453bf42014-03-28 09:18:45 +1000144 ast_write32(ast, 0xf004, 0x1e6e0000);
145 ast_write32(ast, 0xf000, 0x1);
146 data = ast_read32(ast, 0x1207c);
147 data &= 0x300;
148 if (ast->chip == AST2300 && data == 0x0) /* ast1300 */
149 ast->support_wide_screen = true;
150 if (ast->chip == AST2400 && data == 0x100) /* ast1400 */
151 ast->support_wide_screen = true;
Dave Airlief1f62f22014-01-17 10:56:09 +1000152 }
153 break;
154 }
155
Benjamin Herrenschmidtd1b98552014-09-04 17:50:11 +1000156 /* Check 3rd Tx option (digital output afaik) */
Dave Airlie83c66202014-03-28 11:05:12 +1000157 ast->tx_chip_type = AST_TX_NONE;
Benjamin Herrenschmidtd1b98552014-09-04 17:50:11 +1000158
159 /*
160 * VGACRA3 Enhanced Color Mode Register, check if DVO is already
161 * enabled, in that case, assume we have a SIL164 TMDS transmitter
Benjamin Herrenschmidt42fb1422014-09-04 17:50:21 +1000162 *
163 * Don't make that assumption if we the chip wasn't enabled and
164 * is at power-on reset, otherwise we'll incorrectly "detect" a
165 * SIL164 when there is none.
Benjamin Herrenschmidtd1b98552014-09-04 17:50:11 +1000166 */
Benjamin Herrenschmidt42fb1422014-09-04 17:50:21 +1000167 if (!*need_post) {
168 jreg = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xa3, 0xff);
169 if (jreg & 0x80)
170 ast->tx_chip_type = AST_TX_SIL164;
171 }
Benjamin Herrenschmidtd1b98552014-09-04 17:50:11 +1000172
Dave Airlie83c66202014-03-28 11:05:12 +1000173 if ((ast->chip == AST2300) || (ast->chip == AST2400)) {
Benjamin Herrenschmidtd1b98552014-09-04 17:50:11 +1000174 /*
175 * On AST2300 and 2400, look the configuration set by the SoC in
176 * the SOC scratch register #1 bits 11:8 (interestingly marked
Benjamin Herrenschmidt42fb1422014-09-04 17:50:21 +1000177 * as "reserved" in the spec)
Benjamin Herrenschmidtd1b98552014-09-04 17:50:11 +1000178 */
Dave Airlie83c66202014-03-28 11:05:12 +1000179 jreg = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xd1, 0xff);
180 switch (jreg) {
181 case 0x04:
182 ast->tx_chip_type = AST_TX_SIL164;
183 break;
184 case 0x08:
185 ast->dp501_fw_addr = kzalloc(32*1024, GFP_KERNEL);
186 if (ast->dp501_fw_addr) {
187 /* backup firmware */
188 if (ast_backup_fw(dev, ast->dp501_fw_addr, 32*1024)) {
189 kfree(ast->dp501_fw_addr);
190 ast->dp501_fw_addr = NULL;
191 }
192 }
193 /* fallthrough */
194 case 0x0c:
195 ast->tx_chip_type = AST_TX_DP501;
196 }
197 }
198
Benjamin Herrenschmidtd1b98552014-09-04 17:50:11 +1000199 /* Print stuff for diagnostic purposes */
200 switch(ast->tx_chip_type) {
201 case AST_TX_SIL164:
202 DRM_INFO("Using Sil164 TMDS transmitter\n");
203 break;
204 case AST_TX_DP501:
205 DRM_INFO("Using DP501 DisplayPort transmitter\n");
206 break;
207 default:
208 DRM_INFO("Analog VGA only\n");
209 }
Dave Airlie312fec12012-02-29 13:40:04 +0000210 return 0;
211}
212
213static int ast_get_dram_info(struct drm_device *dev)
214{
215 struct ast_private *ast = dev->dev_private;
216 uint32_t data, data2;
217 uint32_t denum, num, div, ref_pll;
218
219 ast_write32(ast, 0xf004, 0x1e6e0000);
220 ast_write32(ast, 0xf000, 0x1);
221
222
223 ast_write32(ast, 0x10000, 0xfc600309);
224
225 do {
226 ;
227 } while (ast_read32(ast, 0x10000) != 0x01);
228 data = ast_read32(ast, 0x10004);
229
230 if (data & 0x400)
231 ast->dram_bus_width = 16;
232 else
233 ast->dram_bus_width = 32;
234
Dave Airlie1453bf42014-03-28 09:18:45 +1000235 if (ast->chip == AST2300 || ast->chip == AST2400) {
Dave Airlie312fec12012-02-29 13:40:04 +0000236 switch (data & 0x03) {
237 case 0:
238 ast->dram_type = AST_DRAM_512Mx16;
239 break;
240 default:
241 case 1:
242 ast->dram_type = AST_DRAM_1Gx16;
243 break;
244 case 2:
245 ast->dram_type = AST_DRAM_2Gx16;
246 break;
247 case 3:
248 ast->dram_type = AST_DRAM_4Gx16;
249 break;
250 }
251 } else {
252 switch (data & 0x0c) {
253 case 0:
254 case 4:
255 ast->dram_type = AST_DRAM_512Mx16;
256 break;
257 case 8:
258 if (data & 0x40)
259 ast->dram_type = AST_DRAM_1Gx16;
260 else
261 ast->dram_type = AST_DRAM_512Mx32;
262 break;
263 case 0xc:
264 ast->dram_type = AST_DRAM_1Gx32;
265 break;
266 }
267 }
268
269 data = ast_read32(ast, 0x10120);
270 data2 = ast_read32(ast, 0x10170);
271 if (data2 & 0x2000)
272 ref_pll = 14318;
273 else
274 ref_pll = 12000;
275
276 denum = data & 0x1f;
277 num = (data & 0x3fe0) >> 5;
278 data = (data & 0xc000) >> 14;
279 switch (data) {
280 case 3:
281 div = 0x4;
282 break;
283 case 2:
284 case 1:
285 div = 0x2;
286 break;
287 default:
288 div = 0x1;
289 break;
290 }
291 ast->mclk = ref_pll * (num + 2) / (denum + 2) * (div * 1000);
292 return 0;
293}
294
Dave Airlie312fec12012-02-29 13:40:04 +0000295static void ast_user_framebuffer_destroy(struct drm_framebuffer *fb)
296{
297 struct ast_framebuffer *ast_fb = to_ast_framebuffer(fb);
298 if (ast_fb->obj)
299 drm_gem_object_unreference_unlocked(ast_fb->obj);
300
301 drm_framebuffer_cleanup(fb);
302 kfree(fb);
303}
304
Dave Airlie312fec12012-02-29 13:40:04 +0000305static const struct drm_framebuffer_funcs ast_fb_funcs = {
306 .destroy = ast_user_framebuffer_destroy,
Dave Airlie312fec12012-02-29 13:40:04 +0000307};
308
309
310int ast_framebuffer_init(struct drm_device *dev,
311 struct ast_framebuffer *ast_fb,
312 struct drm_mode_fb_cmd2 *mode_cmd,
313 struct drm_gem_object *obj)
314{
315 int ret;
316
Daniel Vetterc7d73f62012-12-13 23:38:38 +0100317 drm_helper_mode_fill_fb_struct(&ast_fb->base, mode_cmd);
318 ast_fb->obj = obj;
Dave Airlie312fec12012-02-29 13:40:04 +0000319 ret = drm_framebuffer_init(dev, &ast_fb->base, &ast_fb_funcs);
320 if (ret) {
321 DRM_ERROR("framebuffer init failed %d\n", ret);
322 return ret;
323 }
Dave Airlie312fec12012-02-29 13:40:04 +0000324 return 0;
325}
326
327static struct drm_framebuffer *
328ast_user_framebuffer_create(struct drm_device *dev,
329 struct drm_file *filp,
330 struct drm_mode_fb_cmd2 *mode_cmd)
331{
332 struct drm_gem_object *obj;
333 struct ast_framebuffer *ast_fb;
334 int ret;
335
336 obj = drm_gem_object_lookup(dev, filp, mode_cmd->handles[0]);
337 if (obj == NULL)
338 return ERR_PTR(-ENOENT);
339
340 ast_fb = kzalloc(sizeof(*ast_fb), GFP_KERNEL);
341 if (!ast_fb) {
342 drm_gem_object_unreference_unlocked(obj);
343 return ERR_PTR(-ENOMEM);
344 }
345
346 ret = ast_framebuffer_init(dev, ast_fb, mode_cmd, obj);
347 if (ret) {
348 drm_gem_object_unreference_unlocked(obj);
349 kfree(ast_fb);
350 return ERR_PTR(ret);
351 }
352 return &ast_fb->base;
353}
354
355static const struct drm_mode_config_funcs ast_mode_funcs = {
356 .fb_create = ast_user_framebuffer_create,
357};
358
359static u32 ast_get_vram_info(struct drm_device *dev)
360{
361 struct ast_private *ast = dev->dev_private;
362 u8 jreg;
Dave Airlie83c66202014-03-28 11:05:12 +1000363 u32 vram_size;
Dave Airlie312fec12012-02-29 13:40:04 +0000364 ast_open_key(ast);
365
Dave Airlie83c66202014-03-28 11:05:12 +1000366 vram_size = AST_VIDMEM_DEFAULT_SIZE;
Dave Airlie312fec12012-02-29 13:40:04 +0000367 jreg = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xaa, 0xff);
368 switch (jreg & 3) {
Dave Airlie83c66202014-03-28 11:05:12 +1000369 case 0: vram_size = AST_VIDMEM_SIZE_8M; break;
370 case 1: vram_size = AST_VIDMEM_SIZE_16M; break;
371 case 2: vram_size = AST_VIDMEM_SIZE_32M; break;
372 case 3: vram_size = AST_VIDMEM_SIZE_64M; break;
Dave Airlie312fec12012-02-29 13:40:04 +0000373 }
Dave Airlie83c66202014-03-28 11:05:12 +1000374
375 jreg = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0x99, 0xff);
376 switch (jreg & 0x03) {
377 case 1:
378 vram_size -= 0x100000;
379 break;
380 case 2:
381 vram_size -= 0x200000;
382 break;
383 case 3:
384 vram_size -= 0x400000;
385 break;
386 }
387
388 return vram_size;
Dave Airlie312fec12012-02-29 13:40:04 +0000389}
390
391int ast_driver_load(struct drm_device *dev, unsigned long flags)
392{
393 struct ast_private *ast;
Benjamin Herrenschmidtd1b98552014-09-04 17:50:11 +1000394 bool need_post;
Dave Airlie312fec12012-02-29 13:40:04 +0000395 int ret = 0;
396
397 ast = kzalloc(sizeof(struct ast_private), GFP_KERNEL);
398 if (!ast)
399 return -ENOMEM;
400
401 dev->dev_private = ast;
402 ast->dev = dev;
403
404 ast->regs = pci_iomap(dev->pdev, 1, 0);
405 if (!ast->regs) {
406 ret = -EIO;
407 goto out_free;
408 }
Benjamin Herrenschmidt0dd68302014-09-04 17:44:18 +1000409
410 /*
411 * If we don't have IO space at all, use MMIO now and
412 * assume the chip has MMIO enabled by default (rev 0x20
413 * and higher).
414 */
415 if (!(pci_resource_flags(dev->pdev, 2) & IORESOURCE_IO)) {
416 DRM_INFO("platform has no IO space, trying MMIO\n");
417 ast->ioregs = ast->regs + AST_IO_MM_OFFSET;
Dave Airlie312fec12012-02-29 13:40:04 +0000418 }
419
Benjamin Herrenschmidt0dd68302014-09-04 17:44:18 +1000420 /* "map" IO regs if the above hasn't done so already */
Dave Airlie312fec12012-02-29 13:40:04 +0000421 if (!ast->ioregs) {
Benjamin Herrenschmidt0dd68302014-09-04 17:44:18 +1000422 ast->ioregs = pci_iomap(dev->pdev, 2, 0);
423 if (!ast->ioregs) {
424 ret = -EIO;
425 goto out_free;
426 }
Dave Airlie312fec12012-02-29 13:40:04 +0000427 }
428
Benjamin Herrenschmidtd1b98552014-09-04 17:50:11 +1000429 ast_detect_chip(dev, &need_post);
Dave Airlie312fec12012-02-29 13:40:04 +0000430
431 if (ast->chip != AST1180) {
432 ast_get_dram_info(dev);
433 ast->vram_size = ast_get_vram_info(dev);
434 DRM_INFO("dram %d %d %d %08x\n", ast->mclk, ast->dram_type, ast->dram_bus_width, ast->vram_size);
435 }
436
Benjamin Herrenschmidtd1b98552014-09-04 17:50:11 +1000437 if (need_post)
438 ast_post_gpu(dev);
439
Dave Airlie312fec12012-02-29 13:40:04 +0000440 ret = ast_mm_init(ast);
441 if (ret)
442 goto out_free;
443
444 drm_mode_config_init(dev);
445
446 dev->mode_config.funcs = (void *)&ast_mode_funcs;
447 dev->mode_config.min_width = 0;
448 dev->mode_config.min_height = 0;
449 dev->mode_config.preferred_depth = 24;
450 dev->mode_config.prefer_shadow = 1;
451
452 if (ast->chip == AST2100 ||
453 ast->chip == AST2200 ||
454 ast->chip == AST2300 ||
Dave Airlie1453bf42014-03-28 09:18:45 +1000455 ast->chip == AST2400 ||
Dave Airlie312fec12012-02-29 13:40:04 +0000456 ast->chip == AST1180) {
457 dev->mode_config.max_width = 1920;
458 dev->mode_config.max_height = 2048;
459 } else {
460 dev->mode_config.max_width = 1600;
461 dev->mode_config.max_height = 1200;
462 }
463
464 ret = ast_mode_init(dev);
465 if (ret)
466 goto out_free;
467
468 ret = ast_fbdev_init(dev);
469 if (ret)
470 goto out_free;
471
472 return 0;
473out_free:
474 kfree(ast);
475 dev->dev_private = NULL;
476 return ret;
477}
478
479int ast_driver_unload(struct drm_device *dev)
480{
481 struct ast_private *ast = dev->dev_private;
482
Dave Airlie83c66202014-03-28 11:05:12 +1000483 kfree(ast->dp501_fw_addr);
Dave Airlie312fec12012-02-29 13:40:04 +0000484 ast_mode_fini(dev);
485 ast_fbdev_fini(dev);
486 drm_mode_config_cleanup(dev);
487
488 ast_mm_fini(ast);
489 pci_iounmap(dev->pdev, ast->ioregs);
490 pci_iounmap(dev->pdev, ast->regs);
491 kfree(ast);
492 return 0;
493}
494
495int ast_gem_create(struct drm_device *dev,
496 u32 size, bool iskernel,
497 struct drm_gem_object **obj)
498{
499 struct ast_bo *astbo;
500 int ret;
501
502 *obj = NULL;
503
504 size = roundup(size, PAGE_SIZE);
505 if (size == 0)
506 return -EINVAL;
507
508 ret = ast_bo_create(dev, size, 0, 0, &astbo);
509 if (ret) {
510 if (ret != -ERESTARTSYS)
511 DRM_ERROR("failed to allocate GEM object\n");
512 return ret;
513 }
514 *obj = &astbo->gem;
515 return 0;
516}
517
518int ast_dumb_create(struct drm_file *file,
519 struct drm_device *dev,
520 struct drm_mode_create_dumb *args)
521{
522 int ret;
523 struct drm_gem_object *gobj;
524 u32 handle;
525
526 args->pitch = args->width * ((args->bpp + 7) / 8);
527 args->size = args->pitch * args->height;
528
529 ret = ast_gem_create(dev, args->size, false,
530 &gobj);
531 if (ret)
532 return ret;
533
534 ret = drm_gem_handle_create(file, gobj, &handle);
535 drm_gem_object_unreference_unlocked(gobj);
536 if (ret)
537 return ret;
538
539 args->handle = handle;
540 return 0;
541}
542
Rashikaf6109802014-01-06 20:00:40 +0530543static void ast_bo_unref(struct ast_bo **bo)
Dave Airlie312fec12012-02-29 13:40:04 +0000544{
545 struct ttm_buffer_object *tbo;
546
547 if ((*bo) == NULL)
548 return;
549
550 tbo = &((*bo)->bo);
551 ttm_bo_unref(&tbo);
Daniel Vettereb649a62014-04-05 10:10:51 +0200552 *bo = NULL;
Dave Airlie312fec12012-02-29 13:40:04 +0000553}
Daniel Vettereb649a62014-04-05 10:10:51 +0200554
Dave Airlie312fec12012-02-29 13:40:04 +0000555void ast_gem_free_object(struct drm_gem_object *obj)
556{
557 struct ast_bo *ast_bo = gem_to_ast_bo(obj);
558
Dave Airlie312fec12012-02-29 13:40:04 +0000559 ast_bo_unref(&ast_bo);
560}
561
562
563static inline u64 ast_bo_mmap_offset(struct ast_bo *bo)
564{
David Herrmann72525b32013-07-24 21:08:53 +0200565 return drm_vma_node_offset_addr(&bo->bo.vma_node);
Dave Airlie312fec12012-02-29 13:40:04 +0000566}
567int
568ast_dumb_mmap_offset(struct drm_file *file,
569 struct drm_device *dev,
570 uint32_t handle,
571 uint64_t *offset)
572{
573 struct drm_gem_object *obj;
574 int ret;
575 struct ast_bo *bo;
576
577 mutex_lock(&dev->struct_mutex);
578 obj = drm_gem_object_lookup(dev, file, handle);
579 if (obj == NULL) {
580 ret = -ENOENT;
581 goto out_unlock;
582 }
583
584 bo = gem_to_ast_bo(obj);
585 *offset = ast_bo_mmap_offset(bo);
586
587 drm_gem_object_unreference(obj);
588 ret = 0;
589out_unlock:
590 mutex_unlock(&dev->struct_mutex);
591 return ret;
592
593}
594