1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright 2019 Hans de Goede <hdegoede@redhat.com>
4 */
5
6 #include <linux/module.h>
7 #include <linux/pm.h>
8 #include <linux/usb.h>
9
10 #include <drm/drm_atomic_helper.h>
11 #include <drm/drm_atomic_state_helper.h>
12 #include <drm/drm_connector.h>
13 #include <drm/drm_damage_helper.h>
14 #include <drm/drm_drv.h>
15 #include <drm/drm_edid.h>
16 #include <drm/drm_fbdev_generic.h>
17 #include <drm/drm_file.h>
18 #include <drm/drm_format_helper.h>
19 #include <drm/drm_fourcc.h>
20 #include <drm/drm_framebuffer.h>
21 #include <drm/drm_gem_atomic_helper.h>
22 #include <drm/drm_gem_framebuffer_helper.h>
23 #include <drm/drm_gem_shmem_helper.h>
24 #include <drm/drm_ioctl.h>
25 #include <drm/drm_managed.h>
26 #include <drm/drm_modeset_helper_vtables.h>
27 #include <drm/drm_probe_helper.h>
28 #include <drm/drm_simple_kms_helper.h>
29
30 static bool eco_mode;
31 module_param(eco_mode, bool, 0644);
32 MODULE_PARM_DESC(eco_mode, "Turn on Eco mode (less bright, more silent)");
33
34 #define DRIVER_NAME "gm12u320"
35 #define DRIVER_DESC "Grain Media GM12U320 USB projector display"
36 #define DRIVER_DATE "2019"
37 #define DRIVER_MAJOR 1
38 #define DRIVER_MINOR 0
39
40 /*
41 * The DLP has an actual width of 854 pixels, but that is not a multiple
42 * of 8, breaking things left and right, so we export a width of 848.
43 */
44 #define GM12U320_USER_WIDTH 848
45 #define GM12U320_REAL_WIDTH 854
46 #define GM12U320_HEIGHT 480
47
48 #define GM12U320_BLOCK_COUNT 20
49
50 #define GM12U320_ERR(fmt, ...) \
51 DRM_DEV_ERROR(gm12u320->dev.dev, fmt, ##__VA_ARGS__)
52
53 #define MISC_RCV_EPT 1
54 #define DATA_RCV_EPT 2
55 #define DATA_SND_EPT 3
56 #define MISC_SND_EPT 4
57
58 #define DATA_BLOCK_HEADER_SIZE 84
59 #define DATA_BLOCK_CONTENT_SIZE 64512
60 #define DATA_BLOCK_FOOTER_SIZE 20
61 #define DATA_BLOCK_SIZE (DATA_BLOCK_HEADER_SIZE + \
62 DATA_BLOCK_CONTENT_SIZE + \
63 DATA_BLOCK_FOOTER_SIZE)
64 #define DATA_LAST_BLOCK_CONTENT_SIZE 4032
65 #define DATA_LAST_BLOCK_SIZE (DATA_BLOCK_HEADER_SIZE + \
66 DATA_LAST_BLOCK_CONTENT_SIZE + \
67 DATA_BLOCK_FOOTER_SIZE)
68
69 #define CMD_SIZE 31
70 #define READ_STATUS_SIZE 13
71 #define MISC_VALUE_SIZE 4
72
73 #define CMD_TIMEOUT 200
74 #define DATA_TIMEOUT 1000
75 #define IDLE_TIMEOUT 2000
76 #define FIRST_FRAME_TIMEOUT 2000
77
78 #define MISC_REQ_GET_SET_ECO_A 0xff
79 #define MISC_REQ_GET_SET_ECO_B 0x35
80 /* Windows driver does once every second, with arg d = 1, other args 0 */
81 #define MISC_REQ_UNKNOWN1_A 0xff
82 #define MISC_REQ_UNKNOWN1_B 0x38
83 /* Windows driver does this on init, with arg a, b = 0, c = 0xa0, d = 4 */
84 #define MISC_REQ_UNKNOWN2_A 0xa5
85 #define MISC_REQ_UNKNOWN2_B 0x00
86
87 struct gm12u320_device {
88 struct drm_device dev;
89 struct device *dmadev;
90 struct drm_simple_display_pipe pipe;
91 struct drm_connector conn;
92 unsigned char *cmd_buf;
93 unsigned char *data_buf[GM12U320_BLOCK_COUNT];
94 struct {
95 struct delayed_work work;
96 struct mutex lock;
97 struct drm_framebuffer *fb;
98 struct drm_rect rect;
99 int frame;
100 int draw_status_timeout;
101 struct iosys_map src_map;
102 } fb_update;
103 };
104
105 #define to_gm12u320(__dev) container_of(__dev, struct gm12u320_device, dev)
106
107 static const char cmd_data[CMD_SIZE] = {
108 0x55, 0x53, 0x42, 0x43, 0x00, 0x00, 0x00, 0x00,
109 0x68, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x10, 0xff,
110 0x00, 0x00, 0x00, 0x00, 0xfc, 0x00, 0x80, 0x00,
111 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
112 };
113
114 static const char cmd_draw[CMD_SIZE] = {
115 0x55, 0x53, 0x42, 0x43, 0x00, 0x00, 0x00, 0x00,
116 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0xfe,
117 0x00, 0x00, 0x00, 0xc0, 0xd1, 0x05, 0x00, 0x40,
118 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00
119 };
120
121 static const char cmd_misc[CMD_SIZE] = {
122 0x55, 0x53, 0x42, 0x43, 0x00, 0x00, 0x00, 0x00,
123 0x04, 0x00, 0x00, 0x00, 0x80, 0x01, 0x10, 0xfd,
124 0x00, 0x00, 0x00, 0xc0, 0x00, 0x00, 0x00, 0x00,
125 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
126 };
127
128 static const char data_block_header[DATA_BLOCK_HEADER_SIZE] = {
129 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
130 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
131 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
132 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
133 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
134 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
135 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
136 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
137 0xfb, 0x14, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
138 0x00, 0x04, 0x15, 0x00, 0x00, 0xfc, 0x00, 0x00,
139 0x01, 0x00, 0x00, 0xdb
140 };
141
142 static const char data_last_block_header[DATA_BLOCK_HEADER_SIZE] = {
143 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
144 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
145 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
146 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
147 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
148 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
149 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
150 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
151 0xfb, 0x14, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
152 0x2a, 0x00, 0x20, 0x00, 0xc0, 0x0f, 0x00, 0x00,
153 0x01, 0x00, 0x00, 0xd7
154 };
155
156 static const char data_block_footer[DATA_BLOCK_FOOTER_SIZE] = {
157 0xfb, 0x14, 0x02, 0x20, 0x00, 0x00, 0x00, 0x00,
158 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
159 0x80, 0x00, 0x00, 0x4f
160 };
161
gm12u320_to_usb_device(struct gm12u320_device * gm12u320)162 static inline struct usb_device *gm12u320_to_usb_device(struct gm12u320_device *gm12u320)
163 {
164 return interface_to_usbdev(to_usb_interface(gm12u320->dev.dev));
165 }
166
gm12u320_usb_alloc(struct gm12u320_device * gm12u320)167 static int gm12u320_usb_alloc(struct gm12u320_device *gm12u320)
168 {
169 int i, block_size;
170 const char *hdr;
171
172 gm12u320->cmd_buf = drmm_kmalloc(&gm12u320->dev, CMD_SIZE, GFP_KERNEL);
173 if (!gm12u320->cmd_buf)
174 return -ENOMEM;
175
176 for (i = 0; i < GM12U320_BLOCK_COUNT; i++) {
177 if (i == GM12U320_BLOCK_COUNT - 1) {
178 block_size = DATA_LAST_BLOCK_SIZE;
179 hdr = data_last_block_header;
180 } else {
181 block_size = DATA_BLOCK_SIZE;
182 hdr = data_block_header;
183 }
184
185 gm12u320->data_buf[i] = drmm_kzalloc(&gm12u320->dev,
186 block_size, GFP_KERNEL);
187 if (!gm12u320->data_buf[i])
188 return -ENOMEM;
189
190 memcpy(gm12u320->data_buf[i], hdr, DATA_BLOCK_HEADER_SIZE);
191 memcpy(gm12u320->data_buf[i] +
192 (block_size - DATA_BLOCK_FOOTER_SIZE),
193 data_block_footer, DATA_BLOCK_FOOTER_SIZE);
194 }
195
196 return 0;
197 }
198
gm12u320_misc_request(struct gm12u320_device * gm12u320,u8 req_a,u8 req_b,u8 arg_a,u8 arg_b,u8 arg_c,u8 arg_d)199 static int gm12u320_misc_request(struct gm12u320_device *gm12u320,
200 u8 req_a, u8 req_b,
201 u8 arg_a, u8 arg_b, u8 arg_c, u8 arg_d)
202 {
203 struct usb_device *udev = gm12u320_to_usb_device(gm12u320);
204 int ret, len;
205
206 memcpy(gm12u320->cmd_buf, &cmd_misc, CMD_SIZE);
207 gm12u320->cmd_buf[20] = req_a;
208 gm12u320->cmd_buf[21] = req_b;
209 gm12u320->cmd_buf[22] = arg_a;
210 gm12u320->cmd_buf[23] = arg_b;
211 gm12u320->cmd_buf[24] = arg_c;
212 gm12u320->cmd_buf[25] = arg_d;
213
214 /* Send request */
215 ret = usb_bulk_msg(udev, usb_sndbulkpipe(udev, MISC_SND_EPT),
216 gm12u320->cmd_buf, CMD_SIZE, &len, CMD_TIMEOUT);
217 if (ret || len != CMD_SIZE) {
218 GM12U320_ERR("Misc. req. error %d\n", ret);
219 return -EIO;
220 }
221
222 /* Read value */
223 ret = usb_bulk_msg(udev, usb_rcvbulkpipe(udev, MISC_RCV_EPT),
224 gm12u320->cmd_buf, MISC_VALUE_SIZE, &len,
225 DATA_TIMEOUT);
226 if (ret || len != MISC_VALUE_SIZE) {
227 GM12U320_ERR("Misc. value error %d\n", ret);
228 return -EIO;
229 }
230 /* cmd_buf[0] now contains the read value, which we don't use */
231
232 /* Read status */
233 ret = usb_bulk_msg(udev, usb_rcvbulkpipe(udev, MISC_RCV_EPT),
234 gm12u320->cmd_buf, READ_STATUS_SIZE, &len,
235 CMD_TIMEOUT);
236 if (ret || len != READ_STATUS_SIZE) {
237 GM12U320_ERR("Misc. status error %d\n", ret);
238 return -EIO;
239 }
240
241 return 0;
242 }
243
gm12u320_32bpp_to_24bpp_packed(u8 * dst,u8 * src,int len)244 static void gm12u320_32bpp_to_24bpp_packed(u8 *dst, u8 *src, int len)
245 {
246 while (len--) {
247 *dst++ = *src++;
248 *dst++ = *src++;
249 *dst++ = *src++;
250 src++;
251 }
252 }
253
gm12u320_copy_fb_to_blocks(struct gm12u320_device * gm12u320)254 static void gm12u320_copy_fb_to_blocks(struct gm12u320_device *gm12u320)
255 {
256 int block, dst_offset, len, remain, ret, x1, x2, y1, y2;
257 struct drm_framebuffer *fb;
258 void *vaddr;
259 u8 *src;
260
261 mutex_lock(&gm12u320->fb_update.lock);
262
263 if (!gm12u320->fb_update.fb)
264 goto unlock;
265
266 fb = gm12u320->fb_update.fb;
267 x1 = gm12u320->fb_update.rect.x1;
268 x2 = gm12u320->fb_update.rect.x2;
269 y1 = gm12u320->fb_update.rect.y1;
270 y2 = gm12u320->fb_update.rect.y2;
271 vaddr = gm12u320->fb_update.src_map.vaddr; /* TODO: Use mapping abstraction properly */
272
273 ret = drm_gem_fb_begin_cpu_access(fb, DMA_FROM_DEVICE);
274 if (ret) {
275 GM12U320_ERR("drm_gem_fb_begin_cpu_access err: %d\n", ret);
276 goto put_fb;
277 }
278
279 src = vaddr + y1 * fb->pitches[0] + x1 * 4;
280
281 x1 += (GM12U320_REAL_WIDTH - GM12U320_USER_WIDTH) / 2;
282 x2 += (GM12U320_REAL_WIDTH - GM12U320_USER_WIDTH) / 2;
283
284 for (; y1 < y2; y1++) {
285 remain = 0;
286 len = (x2 - x1) * 3;
287 dst_offset = (y1 * GM12U320_REAL_WIDTH + x1) * 3;
288 block = dst_offset / DATA_BLOCK_CONTENT_SIZE;
289 dst_offset %= DATA_BLOCK_CONTENT_SIZE;
290
291 if ((dst_offset + len) > DATA_BLOCK_CONTENT_SIZE) {
292 remain = dst_offset + len - DATA_BLOCK_CONTENT_SIZE;
293 len = DATA_BLOCK_CONTENT_SIZE - dst_offset;
294 }
295
296 dst_offset += DATA_BLOCK_HEADER_SIZE;
297 len /= 3;
298
299 gm12u320_32bpp_to_24bpp_packed(
300 gm12u320->data_buf[block] + dst_offset,
301 src, len);
302
303 if (remain) {
304 block++;
305 dst_offset = DATA_BLOCK_HEADER_SIZE;
306 gm12u320_32bpp_to_24bpp_packed(
307 gm12u320->data_buf[block] + dst_offset,
308 src + len * 4, remain / 3);
309 }
310 src += fb->pitches[0];
311 }
312
313 drm_gem_fb_end_cpu_access(fb, DMA_FROM_DEVICE);
314 put_fb:
315 drm_framebuffer_put(fb);
316 gm12u320->fb_update.fb = NULL;
317 unlock:
318 mutex_unlock(&gm12u320->fb_update.lock);
319 }
320
gm12u320_fb_update_work(struct work_struct * work)321 static void gm12u320_fb_update_work(struct work_struct *work)
322 {
323 struct gm12u320_device *gm12u320 =
324 container_of(to_delayed_work(work), struct gm12u320_device,
325 fb_update.work);
326 struct usb_device *udev = gm12u320_to_usb_device(gm12u320);
327 int block, block_size, len;
328 int ret = 0;
329
330 gm12u320_copy_fb_to_blocks(gm12u320);
331
332 for (block = 0; block < GM12U320_BLOCK_COUNT; block++) {
333 if (block == GM12U320_BLOCK_COUNT - 1)
334 block_size = DATA_LAST_BLOCK_SIZE;
335 else
336 block_size = DATA_BLOCK_SIZE;
337
338 /* Send data command to device */
339 memcpy(gm12u320->cmd_buf, cmd_data, CMD_SIZE);
340 gm12u320->cmd_buf[8] = block_size & 0xff;
341 gm12u320->cmd_buf[9] = block_size >> 8;
342 gm12u320->cmd_buf[20] = 0xfc - block * 4;
343 gm12u320->cmd_buf[21] =
344 block | (gm12u320->fb_update.frame << 7);
345
346 ret = usb_bulk_msg(udev,
347 usb_sndbulkpipe(udev, DATA_SND_EPT),
348 gm12u320->cmd_buf, CMD_SIZE, &len,
349 CMD_TIMEOUT);
350 if (ret || len != CMD_SIZE)
351 goto err;
352
353 /* Send data block to device */
354 ret = usb_bulk_msg(udev,
355 usb_sndbulkpipe(udev, DATA_SND_EPT),
356 gm12u320->data_buf[block], block_size,
357 &len, DATA_TIMEOUT);
358 if (ret || len != block_size)
359 goto err;
360
361 /* Read status */
362 ret = usb_bulk_msg(udev,
363 usb_rcvbulkpipe(udev, DATA_RCV_EPT),
364 gm12u320->cmd_buf, READ_STATUS_SIZE, &len,
365 CMD_TIMEOUT);
366 if (ret || len != READ_STATUS_SIZE)
367 goto err;
368 }
369
370 /* Send draw command to device */
371 memcpy(gm12u320->cmd_buf, cmd_draw, CMD_SIZE);
372 ret = usb_bulk_msg(udev, usb_sndbulkpipe(udev, DATA_SND_EPT),
373 gm12u320->cmd_buf, CMD_SIZE, &len, CMD_TIMEOUT);
374 if (ret || len != CMD_SIZE)
375 goto err;
376
377 /* Read status */
378 ret = usb_bulk_msg(udev, usb_rcvbulkpipe(udev, DATA_RCV_EPT),
379 gm12u320->cmd_buf, READ_STATUS_SIZE, &len,
380 gm12u320->fb_update.draw_status_timeout);
381 if (ret || len != READ_STATUS_SIZE)
382 goto err;
383
384 gm12u320->fb_update.draw_status_timeout = CMD_TIMEOUT;
385 gm12u320->fb_update.frame = !gm12u320->fb_update.frame;
386
387 /*
388 * We must draw a frame every 2s otherwise the projector
389 * switches back to showing its logo.
390 */
391 queue_delayed_work(system_long_wq, &gm12u320->fb_update.work,
392 msecs_to_jiffies(IDLE_TIMEOUT));
393
394 return;
395 err:
396 /* Do not log errors caused by module unload or device unplug */
397 if (ret != -ENODEV && ret != -ECONNRESET && ret != -ESHUTDOWN)
398 GM12U320_ERR("Frame update error: %d\n", ret);
399 }
400
gm12u320_fb_mark_dirty(struct drm_framebuffer * fb,const struct iosys_map * map,struct drm_rect * dirty)401 static void gm12u320_fb_mark_dirty(struct drm_framebuffer *fb,
402 const struct iosys_map *map,
403 struct drm_rect *dirty)
404 {
405 struct gm12u320_device *gm12u320 = to_gm12u320(fb->dev);
406 struct drm_framebuffer *old_fb = NULL;
407 bool wakeup = false;
408
409 mutex_lock(&gm12u320->fb_update.lock);
410
411 if (gm12u320->fb_update.fb != fb) {
412 old_fb = gm12u320->fb_update.fb;
413 drm_framebuffer_get(fb);
414 gm12u320->fb_update.fb = fb;
415 gm12u320->fb_update.rect = *dirty;
416 gm12u320->fb_update.src_map = *map;
417 wakeup = true;
418 } else {
419 struct drm_rect *rect = &gm12u320->fb_update.rect;
420
421 rect->x1 = min(rect->x1, dirty->x1);
422 rect->y1 = min(rect->y1, dirty->y1);
423 rect->x2 = max(rect->x2, dirty->x2);
424 rect->y2 = max(rect->y2, dirty->y2);
425 }
426
427 mutex_unlock(&gm12u320->fb_update.lock);
428
429 if (wakeup)
430 mod_delayed_work(system_long_wq, &gm12u320->fb_update.work, 0);
431
432 if (old_fb)
433 drm_framebuffer_put(old_fb);
434 }
435
gm12u320_stop_fb_update(struct gm12u320_device * gm12u320)436 static void gm12u320_stop_fb_update(struct gm12u320_device *gm12u320)
437 {
438 struct drm_framebuffer *old_fb;
439
440 cancel_delayed_work_sync(&gm12u320->fb_update.work);
441
442 mutex_lock(&gm12u320->fb_update.lock);
443 old_fb = gm12u320->fb_update.fb;
444 gm12u320->fb_update.fb = NULL;
445 iosys_map_clear(&gm12u320->fb_update.src_map);
446 mutex_unlock(&gm12u320->fb_update.lock);
447
448 drm_framebuffer_put(old_fb);
449 }
450
gm12u320_set_ecomode(struct gm12u320_device * gm12u320)451 static int gm12u320_set_ecomode(struct gm12u320_device *gm12u320)
452 {
453 return gm12u320_misc_request(gm12u320, MISC_REQ_GET_SET_ECO_A,
454 MISC_REQ_GET_SET_ECO_B, 0x01 /* set */,
455 eco_mode ? 0x01 : 0x00, 0x00, 0x01);
456 }
457
458 /* ------------------------------------------------------------------ */
459 /* gm12u320 connector */
460
461 /*
462 * We use fake EDID info so that userspace know that it is dealing with
463 * an Acer projector, rather then listing this as an "unknown" monitor.
464 * Note this assumes this driver is only ever used with the Acer C120, if we
465 * add support for other devices the vendor and model should be parameterized.
466 */
467 static struct edid gm12u320_edid = {
468 .header = { 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00 },
469 .mfg_id = { 0x04, 0x72 }, /* "ACR" */
470 .prod_code = { 0x20, 0xc1 }, /* C120h */
471 .serial = 0xaa55aa55,
472 .mfg_week = 1,
473 .mfg_year = 16,
474 .version = 1, /* EDID 1.3 */
475 .revision = 3, /* EDID 1.3 */
476 .input = 0x08, /* Analog input */
477 .features = 0x0a, /* Pref timing in DTD 1 */
478 .standard_timings = { { 1, 1 }, { 1, 1 }, { 1, 1 }, { 1, 1 },
479 { 1, 1 }, { 1, 1 }, { 1, 1 }, { 1, 1 } },
480 .detailed_timings = { {
481 .pixel_clock = 3383,
482 /* hactive = 848, hblank = 256 */
483 .data.pixel_data.hactive_lo = 0x50,
484 .data.pixel_data.hblank_lo = 0x00,
485 .data.pixel_data.hactive_hblank_hi = 0x31,
486 /* vactive = 480, vblank = 28 */
487 .data.pixel_data.vactive_lo = 0xe0,
488 .data.pixel_data.vblank_lo = 0x1c,
489 .data.pixel_data.vactive_vblank_hi = 0x10,
490 /* hsync offset 40 pw 128, vsync offset 1 pw 4 */
491 .data.pixel_data.hsync_offset_lo = 0x28,
492 .data.pixel_data.hsync_pulse_width_lo = 0x80,
493 .data.pixel_data.vsync_offset_pulse_width_lo = 0x14,
494 .data.pixel_data.hsync_vsync_offset_pulse_width_hi = 0x00,
495 /* Digital separate syncs, hsync+, vsync+ */
496 .data.pixel_data.misc = 0x1e,
497 }, {
498 .pixel_clock = 0,
499 .data.other_data.type = 0xfd, /* Monitor ranges */
500 .data.other_data.data.range.min_vfreq = 59,
501 .data.other_data.data.range.max_vfreq = 61,
502 .data.other_data.data.range.min_hfreq_khz = 29,
503 .data.other_data.data.range.max_hfreq_khz = 32,
504 .data.other_data.data.range.pixel_clock_mhz = 4, /* 40 MHz */
505 .data.other_data.data.range.flags = 0,
506 .data.other_data.data.range.formula.cvt = {
507 0xa0, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20 },
508 }, {
509 .pixel_clock = 0,
510 .data.other_data.type = 0xfc, /* Model string */
511 .data.other_data.data.str.str = {
512 'P', 'r', 'o', 'j', 'e', 'c', 't', 'o', 'r', '\n',
513 ' ', ' ', ' ' },
514 }, {
515 .pixel_clock = 0,
516 .data.other_data.type = 0xfe, /* Unspecified text / padding */
517 .data.other_data.data.str.str = {
518 '\n', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ',
519 ' ', ' ', ' ' },
520 } },
521 .checksum = 0x13,
522 };
523
gm12u320_conn_get_modes(struct drm_connector * connector)524 static int gm12u320_conn_get_modes(struct drm_connector *connector)
525 {
526 drm_connector_update_edid_property(connector, &gm12u320_edid);
527 return drm_add_edid_modes(connector, &gm12u320_edid);
528 }
529
530 static const struct drm_connector_helper_funcs gm12u320_conn_helper_funcs = {
531 .get_modes = gm12u320_conn_get_modes,
532 };
533
534 static const struct drm_connector_funcs gm12u320_conn_funcs = {
535 .fill_modes = drm_helper_probe_single_connector_modes,
536 .destroy = drm_connector_cleanup,
537 .reset = drm_atomic_helper_connector_reset,
538 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
539 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
540 };
541
gm12u320_conn_init(struct gm12u320_device * gm12u320)542 static int gm12u320_conn_init(struct gm12u320_device *gm12u320)
543 {
544 drm_connector_helper_add(&gm12u320->conn, &gm12u320_conn_helper_funcs);
545 return drm_connector_init(&gm12u320->dev, &gm12u320->conn,
546 &gm12u320_conn_funcs, DRM_MODE_CONNECTOR_VGA);
547 }
548
549 /* ------------------------------------------------------------------ */
550 /* gm12u320 (simple) display pipe */
551
gm12u320_pipe_enable(struct drm_simple_display_pipe * pipe,struct drm_crtc_state * crtc_state,struct drm_plane_state * plane_state)552 static void gm12u320_pipe_enable(struct drm_simple_display_pipe *pipe,
553 struct drm_crtc_state *crtc_state,
554 struct drm_plane_state *plane_state)
555 {
556 struct drm_rect rect = { 0, 0, GM12U320_USER_WIDTH, GM12U320_HEIGHT };
557 struct gm12u320_device *gm12u320 = to_gm12u320(pipe->crtc.dev);
558 struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(plane_state);
559
560 gm12u320->fb_update.draw_status_timeout = FIRST_FRAME_TIMEOUT;
561 gm12u320_fb_mark_dirty(plane_state->fb, &shadow_plane_state->data[0], &rect);
562 }
563
gm12u320_pipe_disable(struct drm_simple_display_pipe * pipe)564 static void gm12u320_pipe_disable(struct drm_simple_display_pipe *pipe)
565 {
566 struct gm12u320_device *gm12u320 = to_gm12u320(pipe->crtc.dev);
567
568 gm12u320_stop_fb_update(gm12u320);
569 }
570
gm12u320_pipe_update(struct drm_simple_display_pipe * pipe,struct drm_plane_state * old_state)571 static void gm12u320_pipe_update(struct drm_simple_display_pipe *pipe,
572 struct drm_plane_state *old_state)
573 {
574 struct drm_plane_state *state = pipe->plane.state;
575 struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(state);
576 struct drm_rect rect;
577
578 if (drm_atomic_helper_damage_merged(old_state, state, &rect))
579 gm12u320_fb_mark_dirty(state->fb, &shadow_plane_state->data[0], &rect);
580 }
581
582 static const struct drm_simple_display_pipe_funcs gm12u320_pipe_funcs = {
583 .enable = gm12u320_pipe_enable,
584 .disable = gm12u320_pipe_disable,
585 .update = gm12u320_pipe_update,
586 DRM_GEM_SIMPLE_DISPLAY_PIPE_SHADOW_PLANE_FUNCS,
587 };
588
589 static const uint32_t gm12u320_pipe_formats[] = {
590 DRM_FORMAT_XRGB8888,
591 };
592
593 static const uint64_t gm12u320_pipe_modifiers[] = {
594 DRM_FORMAT_MOD_LINEAR,
595 DRM_FORMAT_MOD_INVALID
596 };
597
598 /*
599 * FIXME: Dma-buf sharing requires DMA support by the importing device.
600 * This function is a workaround to make USB devices work as well.
601 * See todo.rst for how to fix the issue in the dma-buf framework.
602 */
gm12u320_gem_prime_import(struct drm_device * dev,struct dma_buf * dma_buf)603 static struct drm_gem_object *gm12u320_gem_prime_import(struct drm_device *dev,
604 struct dma_buf *dma_buf)
605 {
606 struct gm12u320_device *gm12u320 = to_gm12u320(dev);
607
608 if (!gm12u320->dmadev)
609 return ERR_PTR(-ENODEV);
610
611 return drm_gem_prime_import_dev(dev, dma_buf, gm12u320->dmadev);
612 }
613
614 DEFINE_DRM_GEM_FOPS(gm12u320_fops);
615
616 static const struct drm_driver gm12u320_drm_driver = {
617 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
618
619 .name = DRIVER_NAME,
620 .desc = DRIVER_DESC,
621 .date = DRIVER_DATE,
622 .major = DRIVER_MAJOR,
623 .minor = DRIVER_MINOR,
624
625 .fops = &gm12u320_fops,
626 DRM_GEM_SHMEM_DRIVER_OPS,
627 .gem_prime_import = gm12u320_gem_prime_import,
628 };
629
630 static const struct drm_mode_config_funcs gm12u320_mode_config_funcs = {
631 .fb_create = drm_gem_fb_create_with_dirty,
632 .atomic_check = drm_atomic_helper_check,
633 .atomic_commit = drm_atomic_helper_commit,
634 };
635
gm12u320_usb_probe(struct usb_interface * interface,const struct usb_device_id * id)636 static int gm12u320_usb_probe(struct usb_interface *interface,
637 const struct usb_device_id *id)
638 {
639 struct gm12u320_device *gm12u320;
640 struct drm_device *dev;
641 int ret;
642
643 /*
644 * The gm12u320 presents itself to the system as 2 usb mass-storage
645 * interfaces, we only care about / need the first one.
646 */
647 if (interface->cur_altsetting->desc.bInterfaceNumber != 0)
648 return -ENODEV;
649
650 gm12u320 = devm_drm_dev_alloc(&interface->dev, &gm12u320_drm_driver,
651 struct gm12u320_device, dev);
652 if (IS_ERR(gm12u320))
653 return PTR_ERR(gm12u320);
654 dev = &gm12u320->dev;
655
656 gm12u320->dmadev = usb_intf_get_dma_device(to_usb_interface(dev->dev));
657 if (!gm12u320->dmadev)
658 drm_warn(dev, "buffer sharing not supported"); /* not an error */
659
660 INIT_DELAYED_WORK(&gm12u320->fb_update.work, gm12u320_fb_update_work);
661 mutex_init(&gm12u320->fb_update.lock);
662
663 ret = drmm_mode_config_init(dev);
664 if (ret)
665 goto err_put_device;
666
667 dev->mode_config.min_width = GM12U320_USER_WIDTH;
668 dev->mode_config.max_width = GM12U320_USER_WIDTH;
669 dev->mode_config.min_height = GM12U320_HEIGHT;
670 dev->mode_config.max_height = GM12U320_HEIGHT;
671 dev->mode_config.funcs = &gm12u320_mode_config_funcs;
672
673 ret = gm12u320_usb_alloc(gm12u320);
674 if (ret)
675 goto err_put_device;
676
677 ret = gm12u320_set_ecomode(gm12u320);
678 if (ret)
679 goto err_put_device;
680
681 ret = gm12u320_conn_init(gm12u320);
682 if (ret)
683 goto err_put_device;
684
685 ret = drm_simple_display_pipe_init(&gm12u320->dev,
686 &gm12u320->pipe,
687 &gm12u320_pipe_funcs,
688 gm12u320_pipe_formats,
689 ARRAY_SIZE(gm12u320_pipe_formats),
690 gm12u320_pipe_modifiers,
691 &gm12u320->conn);
692 if (ret)
693 goto err_put_device;
694
695 drm_mode_config_reset(dev);
696
697 usb_set_intfdata(interface, dev);
698 ret = drm_dev_register(dev, 0);
699 if (ret)
700 goto err_put_device;
701
702 drm_fbdev_generic_setup(dev, 0);
703
704 return 0;
705
706 err_put_device:
707 put_device(gm12u320->dmadev);
708 return ret;
709 }
710
gm12u320_usb_disconnect(struct usb_interface * interface)711 static void gm12u320_usb_disconnect(struct usb_interface *interface)
712 {
713 struct drm_device *dev = usb_get_intfdata(interface);
714 struct gm12u320_device *gm12u320 = to_gm12u320(dev);
715
716 put_device(gm12u320->dmadev);
717 gm12u320->dmadev = NULL;
718 drm_dev_unplug(dev);
719 drm_atomic_helper_shutdown(dev);
720 }
721
gm12u320_suspend(struct usb_interface * interface,pm_message_t message)722 static int gm12u320_suspend(struct usb_interface *interface,
723 pm_message_t message)
724 {
725 struct drm_device *dev = usb_get_intfdata(interface);
726
727 return drm_mode_config_helper_suspend(dev);
728 }
729
gm12u320_resume(struct usb_interface * interface)730 static int gm12u320_resume(struct usb_interface *interface)
731 {
732 struct drm_device *dev = usb_get_intfdata(interface);
733 struct gm12u320_device *gm12u320 = to_gm12u320(dev);
734
735 gm12u320_set_ecomode(gm12u320);
736
737 return drm_mode_config_helper_resume(dev);
738 }
739
740 static const struct usb_device_id id_table[] = {
741 { USB_DEVICE(0x1de1, 0xc102) },
742 {},
743 };
744 MODULE_DEVICE_TABLE(usb, id_table);
745
746 static struct usb_driver gm12u320_usb_driver = {
747 .name = "gm12u320",
748 .probe = gm12u320_usb_probe,
749 .disconnect = gm12u320_usb_disconnect,
750 .id_table = id_table,
751 .suspend = pm_ptr(gm12u320_suspend),
752 .resume = pm_ptr(gm12u320_resume),
753 .reset_resume = pm_ptr(gm12u320_resume),
754 };
755
756 module_usb_driver(gm12u320_usb_driver);
757 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
758 MODULE_LICENSE("GPL");
759