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_client_setup.h>
13 #include <drm/drm_connector.h>
14 #include <drm/drm_damage_helper.h>
15 #include <drm/drm_drv.h>
16 #include <drm/drm_edid.h>
17 #include <drm/drm_fbdev_shmem.h>
18 #include <drm/drm_file.h>
19 #include <drm/drm_format_helper.h>
20 #include <drm/drm_fourcc.h>
21 #include <drm/drm_framebuffer.h>
22 #include <drm/drm_gem_atomic_helper.h>
23 #include <drm/drm_gem_framebuffer_helper.h>
24 #include <drm/drm_gem_shmem_helper.h>
25 #include <drm/drm_ioctl.h>
26 #include <drm/drm_managed.h>
27 #include <drm/drm_modeset_helper_vtables.h>
28 #include <drm/drm_probe_helper.h>
29 #include <drm/drm_simple_kms_helper.h>
30
31 static bool eco_mode;
32 module_param(eco_mode, bool, 0644);
33 MODULE_PARM_DESC(eco_mode, "Turn on Eco mode (less bright, more silent)");
34
35 #define DRIVER_NAME "gm12u320"
36 #define DRIVER_DESC "Grain Media GM12U320 USB projector display"
37 #define DRIVER_DATE "2019"
38 #define DRIVER_MAJOR 1
39 #define DRIVER_MINOR 0
40
41 /*
42 * The DLP has an actual width of 854 pixels, but that is not a multiple
43 * of 8, breaking things left and right, so we export a width of 848.
44 */
45 #define GM12U320_USER_WIDTH 848
46 #define GM12U320_REAL_WIDTH 854
47 #define GM12U320_HEIGHT 480
48
49 #define GM12U320_BLOCK_COUNT 20
50
51 #define GM12U320_ERR(fmt, ...) \
52 DRM_DEV_ERROR(gm12u320->dev.dev, fmt, ##__VA_ARGS__)
53
54 #define MISC_RCV_EPT 1
55 #define DATA_RCV_EPT 2
56 #define DATA_SND_EPT 3
57 #define MISC_SND_EPT 4
58
59 #define DATA_BLOCK_HEADER_SIZE 84
60 #define DATA_BLOCK_CONTENT_SIZE 64512
61 #define DATA_BLOCK_FOOTER_SIZE 20
62 #define DATA_BLOCK_SIZE (DATA_BLOCK_HEADER_SIZE + \
63 DATA_BLOCK_CONTENT_SIZE + \
64 DATA_BLOCK_FOOTER_SIZE)
65 #define DATA_LAST_BLOCK_CONTENT_SIZE 4032
66 #define DATA_LAST_BLOCK_SIZE (DATA_BLOCK_HEADER_SIZE + \
67 DATA_LAST_BLOCK_CONTENT_SIZE + \
68 DATA_BLOCK_FOOTER_SIZE)
69
70 #define CMD_SIZE 31
71 #define READ_STATUS_SIZE 13
72 #define MISC_VALUE_SIZE 4
73
74 #define CMD_TIMEOUT 200
75 #define DATA_TIMEOUT 1000
76 #define IDLE_TIMEOUT 2000
77 #define FIRST_FRAME_TIMEOUT 2000
78
79 #define MISC_REQ_GET_SET_ECO_A 0xff
80 #define MISC_REQ_GET_SET_ECO_B 0x35
81 /* Windows driver does once every second, with arg d = 1, other args 0 */
82 #define MISC_REQ_UNKNOWN1_A 0xff
83 #define MISC_REQ_UNKNOWN1_B 0x38
84 /* Windows driver does this on init, with arg a, b = 0, c = 0xa0, d = 4 */
85 #define MISC_REQ_UNKNOWN2_A 0xa5
86 #define MISC_REQ_UNKNOWN2_B 0x00
87
88 struct gm12u320_device {
89 struct drm_device dev;
90 struct device *dmadev;
91 struct drm_simple_display_pipe pipe;
92 struct drm_connector conn;
93 unsigned char *cmd_buf;
94 unsigned char *data_buf[GM12U320_BLOCK_COUNT];
95 struct {
96 struct delayed_work work;
97 struct mutex lock;
98 struct drm_framebuffer *fb;
99 struct drm_rect rect;
100 int frame;
101 int draw_status_timeout;
102 struct iosys_map src_map;
103 } fb_update;
104 };
105
106 #define to_gm12u320(__dev) container_of(__dev, struct gm12u320_device, dev)
107
108 static const char cmd_data[CMD_SIZE] = {
109 0x55, 0x53, 0x42, 0x43, 0x00, 0x00, 0x00, 0x00,
110 0x68, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x10, 0xff,
111 0x00, 0x00, 0x00, 0x00, 0xfc, 0x00, 0x80, 0x00,
112 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
113 };
114
115 static const char cmd_draw[CMD_SIZE] = {
116 0x55, 0x53, 0x42, 0x43, 0x00, 0x00, 0x00, 0x00,
117 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0xfe,
118 0x00, 0x00, 0x00, 0xc0, 0xd1, 0x05, 0x00, 0x40,
119 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00
120 };
121
122 static const char cmd_misc[CMD_SIZE] = {
123 0x55, 0x53, 0x42, 0x43, 0x00, 0x00, 0x00, 0x00,
124 0x04, 0x00, 0x00, 0x00, 0x80, 0x01, 0x10, 0xfd,
125 0x00, 0x00, 0x00, 0xc0, 0x00, 0x00, 0x00, 0x00,
126 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
127 };
128
129 static const char data_block_header[DATA_BLOCK_HEADER_SIZE] = {
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 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
138 0xfb, 0x14, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
139 0x00, 0x04, 0x15, 0x00, 0x00, 0xfc, 0x00, 0x00,
140 0x01, 0x00, 0x00, 0xdb
141 };
142
143 static const char data_last_block_header[DATA_BLOCK_HEADER_SIZE] = {
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 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
152 0xfb, 0x14, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
153 0x2a, 0x00, 0x20, 0x00, 0xc0, 0x0f, 0x00, 0x00,
154 0x01, 0x00, 0x00, 0xd7
155 };
156
157 static const char data_block_footer[DATA_BLOCK_FOOTER_SIZE] = {
158 0xfb, 0x14, 0x02, 0x20, 0x00, 0x00, 0x00, 0x00,
159 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
160 0x80, 0x00, 0x00, 0x4f
161 };
162
gm12u320_to_usb_device(struct gm12u320_device * gm12u320)163 static inline struct usb_device *gm12u320_to_usb_device(struct gm12u320_device *gm12u320)
164 {
165 return interface_to_usbdev(to_usb_interface(gm12u320->dev.dev));
166 }
167
gm12u320_usb_alloc(struct gm12u320_device * gm12u320)168 static int gm12u320_usb_alloc(struct gm12u320_device *gm12u320)
169 {
170 int i, block_size;
171 const char *hdr;
172
173 gm12u320->cmd_buf = drmm_kmalloc(&gm12u320->dev, CMD_SIZE, GFP_KERNEL);
174 if (!gm12u320->cmd_buf)
175 return -ENOMEM;
176
177 for (i = 0; i < GM12U320_BLOCK_COUNT; i++) {
178 if (i == GM12U320_BLOCK_COUNT - 1) {
179 block_size = DATA_LAST_BLOCK_SIZE;
180 hdr = data_last_block_header;
181 } else {
182 block_size = DATA_BLOCK_SIZE;
183 hdr = data_block_header;
184 }
185
186 gm12u320->data_buf[i] = drmm_kzalloc(&gm12u320->dev,
187 block_size, GFP_KERNEL);
188 if (!gm12u320->data_buf[i])
189 return -ENOMEM;
190
191 memcpy(gm12u320->data_buf[i], hdr, DATA_BLOCK_HEADER_SIZE);
192 memcpy(gm12u320->data_buf[i] +
193 (block_size - DATA_BLOCK_FOOTER_SIZE),
194 data_block_footer, DATA_BLOCK_FOOTER_SIZE);
195 }
196
197 return 0;
198 }
199
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)200 static int gm12u320_misc_request(struct gm12u320_device *gm12u320,
201 u8 req_a, u8 req_b,
202 u8 arg_a, u8 arg_b, u8 arg_c, u8 arg_d)
203 {
204 struct usb_device *udev = gm12u320_to_usb_device(gm12u320);
205 int ret, len;
206
207 memcpy(gm12u320->cmd_buf, &cmd_misc, CMD_SIZE);
208 gm12u320->cmd_buf[20] = req_a;
209 gm12u320->cmd_buf[21] = req_b;
210 gm12u320->cmd_buf[22] = arg_a;
211 gm12u320->cmd_buf[23] = arg_b;
212 gm12u320->cmd_buf[24] = arg_c;
213 gm12u320->cmd_buf[25] = arg_d;
214
215 /* Send request */
216 ret = usb_bulk_msg(udev, usb_sndbulkpipe(udev, MISC_SND_EPT),
217 gm12u320->cmd_buf, CMD_SIZE, &len, CMD_TIMEOUT);
218 if (ret || len != CMD_SIZE) {
219 GM12U320_ERR("Misc. req. error %d\n", ret);
220 return -EIO;
221 }
222
223 /* Read value */
224 ret = usb_bulk_msg(udev, usb_rcvbulkpipe(udev, MISC_RCV_EPT),
225 gm12u320->cmd_buf, MISC_VALUE_SIZE, &len,
226 DATA_TIMEOUT);
227 if (ret || len != MISC_VALUE_SIZE) {
228 GM12U320_ERR("Misc. value error %d\n", ret);
229 return -EIO;
230 }
231 /* cmd_buf[0] now contains the read value, which we don't use */
232
233 /* Read status */
234 ret = usb_bulk_msg(udev, usb_rcvbulkpipe(udev, MISC_RCV_EPT),
235 gm12u320->cmd_buf, READ_STATUS_SIZE, &len,
236 CMD_TIMEOUT);
237 if (ret || len != READ_STATUS_SIZE) {
238 GM12U320_ERR("Misc. status error %d\n", ret);
239 return -EIO;
240 }
241
242 return 0;
243 }
244
gm12u320_32bpp_to_24bpp_packed(u8 * dst,u8 * src,int len)245 static void gm12u320_32bpp_to_24bpp_packed(u8 *dst, u8 *src, int len)
246 {
247 while (len--) {
248 *dst++ = *src++;
249 *dst++ = *src++;
250 *dst++ = *src++;
251 src++;
252 }
253 }
254
gm12u320_copy_fb_to_blocks(struct gm12u320_device * gm12u320)255 static void gm12u320_copy_fb_to_blocks(struct gm12u320_device *gm12u320)
256 {
257 int block, dst_offset, len, remain, ret, x1, x2, y1, y2;
258 struct drm_framebuffer *fb;
259 void *vaddr;
260 u8 *src;
261
262 mutex_lock(&gm12u320->fb_update.lock);
263
264 if (!gm12u320->fb_update.fb)
265 goto unlock;
266
267 fb = gm12u320->fb_update.fb;
268 x1 = gm12u320->fb_update.rect.x1;
269 x2 = gm12u320->fb_update.rect.x2;
270 y1 = gm12u320->fb_update.rect.y1;
271 y2 = gm12u320->fb_update.rect.y2;
272 vaddr = gm12u320->fb_update.src_map.vaddr; /* TODO: Use mapping abstraction properly */
273
274 ret = drm_gem_fb_begin_cpu_access(fb, DMA_FROM_DEVICE);
275 if (ret) {
276 GM12U320_ERR("drm_gem_fb_begin_cpu_access err: %d\n", ret);
277 goto put_fb;
278 }
279
280 src = vaddr + y1 * fb->pitches[0] + x1 * 4;
281
282 x1 += (GM12U320_REAL_WIDTH - GM12U320_USER_WIDTH) / 2;
283 x2 += (GM12U320_REAL_WIDTH - GM12U320_USER_WIDTH) / 2;
284
285 for (; y1 < y2; y1++) {
286 remain = 0;
287 len = (x2 - x1) * 3;
288 dst_offset = (y1 * GM12U320_REAL_WIDTH + x1) * 3;
289 block = dst_offset / DATA_BLOCK_CONTENT_SIZE;
290 dst_offset %= DATA_BLOCK_CONTENT_SIZE;
291
292 if ((dst_offset + len) > DATA_BLOCK_CONTENT_SIZE) {
293 remain = dst_offset + len - DATA_BLOCK_CONTENT_SIZE;
294 len = DATA_BLOCK_CONTENT_SIZE - dst_offset;
295 }
296
297 dst_offset += DATA_BLOCK_HEADER_SIZE;
298 len /= 3;
299
300 gm12u320_32bpp_to_24bpp_packed(
301 gm12u320->data_buf[block] + dst_offset,
302 src, len);
303
304 if (remain) {
305 block++;
306 dst_offset = DATA_BLOCK_HEADER_SIZE;
307 gm12u320_32bpp_to_24bpp_packed(
308 gm12u320->data_buf[block] + dst_offset,
309 src + len * 4, remain / 3);
310 }
311 src += fb->pitches[0];
312 }
313
314 drm_gem_fb_end_cpu_access(fb, DMA_FROM_DEVICE);
315 put_fb:
316 drm_framebuffer_put(fb);
317 gm12u320->fb_update.fb = NULL;
318 unlock:
319 mutex_unlock(&gm12u320->fb_update.lock);
320 }
321
gm12u320_fb_update_work(struct work_struct * work)322 static void gm12u320_fb_update_work(struct work_struct *work)
323 {
324 struct gm12u320_device *gm12u320 =
325 container_of(to_delayed_work(work), struct gm12u320_device,
326 fb_update.work);
327 struct usb_device *udev = gm12u320_to_usb_device(gm12u320);
328 int block, block_size, len;
329 int ret = 0;
330
331 gm12u320_copy_fb_to_blocks(gm12u320);
332
333 for (block = 0; block < GM12U320_BLOCK_COUNT; block++) {
334 if (block == GM12U320_BLOCK_COUNT - 1)
335 block_size = DATA_LAST_BLOCK_SIZE;
336 else
337 block_size = DATA_BLOCK_SIZE;
338
339 /* Send data command to device */
340 memcpy(gm12u320->cmd_buf, cmd_data, CMD_SIZE);
341 gm12u320->cmd_buf[8] = block_size & 0xff;
342 gm12u320->cmd_buf[9] = block_size >> 8;
343 gm12u320->cmd_buf[20] = 0xfc - block * 4;
344 gm12u320->cmd_buf[21] =
345 block | (gm12u320->fb_update.frame << 7);
346
347 ret = usb_bulk_msg(udev,
348 usb_sndbulkpipe(udev, DATA_SND_EPT),
349 gm12u320->cmd_buf, CMD_SIZE, &len,
350 CMD_TIMEOUT);
351 if (ret || len != CMD_SIZE)
352 goto err;
353
354 /* Send data block to device */
355 ret = usb_bulk_msg(udev,
356 usb_sndbulkpipe(udev, DATA_SND_EPT),
357 gm12u320->data_buf[block], block_size,
358 &len, DATA_TIMEOUT);
359 if (ret || len != block_size)
360 goto err;
361
362 /* Read status */
363 ret = usb_bulk_msg(udev,
364 usb_rcvbulkpipe(udev, DATA_RCV_EPT),
365 gm12u320->cmd_buf, READ_STATUS_SIZE, &len,
366 CMD_TIMEOUT);
367 if (ret || len != READ_STATUS_SIZE)
368 goto err;
369 }
370
371 /* Send draw command to device */
372 memcpy(gm12u320->cmd_buf, cmd_draw, CMD_SIZE);
373 ret = usb_bulk_msg(udev, usb_sndbulkpipe(udev, DATA_SND_EPT),
374 gm12u320->cmd_buf, CMD_SIZE, &len, CMD_TIMEOUT);
375 if (ret || len != CMD_SIZE)
376 goto err;
377
378 /* Read status */
379 ret = usb_bulk_msg(udev, usb_rcvbulkpipe(udev, DATA_RCV_EPT),
380 gm12u320->cmd_buf, READ_STATUS_SIZE, &len,
381 gm12u320->fb_update.draw_status_timeout);
382 if (ret || len != READ_STATUS_SIZE)
383 goto err;
384
385 gm12u320->fb_update.draw_status_timeout = CMD_TIMEOUT;
386 gm12u320->fb_update.frame = !gm12u320->fb_update.frame;
387
388 /*
389 * We must draw a frame every 2s otherwise the projector
390 * switches back to showing its logo.
391 */
392 queue_delayed_work(system_long_wq, &gm12u320->fb_update.work,
393 msecs_to_jiffies(IDLE_TIMEOUT));
394
395 return;
396 err:
397 /* Do not log errors caused by module unload or device unplug */
398 if (ret != -ENODEV && ret != -ECONNRESET && ret != -ESHUTDOWN)
399 GM12U320_ERR("Frame update error: %d\n", ret);
400 }
401
gm12u320_fb_mark_dirty(struct drm_framebuffer * fb,const struct iosys_map * map,struct drm_rect * dirty)402 static void gm12u320_fb_mark_dirty(struct drm_framebuffer *fb,
403 const struct iosys_map *map,
404 struct drm_rect *dirty)
405 {
406 struct gm12u320_device *gm12u320 = to_gm12u320(fb->dev);
407 struct drm_framebuffer *old_fb = NULL;
408 bool wakeup = false;
409
410 mutex_lock(&gm12u320->fb_update.lock);
411
412 if (gm12u320->fb_update.fb != fb) {
413 old_fb = gm12u320->fb_update.fb;
414 drm_framebuffer_get(fb);
415 gm12u320->fb_update.fb = fb;
416 gm12u320->fb_update.rect = *dirty;
417 gm12u320->fb_update.src_map = *map;
418 wakeup = true;
419 } else {
420 struct drm_rect *rect = &gm12u320->fb_update.rect;
421
422 rect->x1 = min(rect->x1, dirty->x1);
423 rect->y1 = min(rect->y1, dirty->y1);
424 rect->x2 = max(rect->x2, dirty->x2);
425 rect->y2 = max(rect->y2, dirty->y2);
426 }
427
428 mutex_unlock(&gm12u320->fb_update.lock);
429
430 if (wakeup)
431 mod_delayed_work(system_long_wq, &gm12u320->fb_update.work, 0);
432
433 if (old_fb)
434 drm_framebuffer_put(old_fb);
435 }
436
gm12u320_stop_fb_update(struct gm12u320_device * gm12u320)437 static void gm12u320_stop_fb_update(struct gm12u320_device *gm12u320)
438 {
439 struct drm_framebuffer *old_fb;
440
441 cancel_delayed_work_sync(&gm12u320->fb_update.work);
442
443 mutex_lock(&gm12u320->fb_update.lock);
444 old_fb = gm12u320->fb_update.fb;
445 gm12u320->fb_update.fb = NULL;
446 iosys_map_clear(&gm12u320->fb_update.src_map);
447 mutex_unlock(&gm12u320->fb_update.lock);
448
449 drm_framebuffer_put(old_fb);
450 }
451
gm12u320_set_ecomode(struct gm12u320_device * gm12u320)452 static int gm12u320_set_ecomode(struct gm12u320_device *gm12u320)
453 {
454 return gm12u320_misc_request(gm12u320, MISC_REQ_GET_SET_ECO_A,
455 MISC_REQ_GET_SET_ECO_B, 0x01 /* set */,
456 eco_mode ? 0x01 : 0x00, 0x00, 0x01);
457 }
458
459 /* ------------------------------------------------------------------ */
460 /* gm12u320 connector */
461
462 /*
463 * We use fake EDID info so that userspace know that it is dealing with
464 * an Acer projector, rather then listing this as an "unknown" monitor.
465 * Note this assumes this driver is only ever used with the Acer C120, if we
466 * add support for other devices the vendor and model should be parameterized.
467 */
468 static const struct edid gm12u320_edid = {
469 .header = { 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00 },
470 .mfg_id = { 0x04, 0x72 }, /* "ACR" */
471 .prod_code = { 0x20, 0xc1 }, /* C120h */
472 .serial = 0xaa55aa55,
473 .mfg_week = 1,
474 .mfg_year = 16,
475 .version = 1, /* EDID 1.3 */
476 .revision = 3, /* EDID 1.3 */
477 .input = 0x08, /* Analog input */
478 .features = 0x0a, /* Pref timing in DTD 1 */
479 .standard_timings = { { 1, 1 }, { 1, 1 }, { 1, 1 }, { 1, 1 },
480 { 1, 1 }, { 1, 1 }, { 1, 1 }, { 1, 1 } },
481 .detailed_timings = { {
482 .pixel_clock = 3383,
483 /* hactive = 848, hblank = 256 */
484 .data.pixel_data.hactive_lo = 0x50,
485 .data.pixel_data.hblank_lo = 0x00,
486 .data.pixel_data.hactive_hblank_hi = 0x31,
487 /* vactive = 480, vblank = 28 */
488 .data.pixel_data.vactive_lo = 0xe0,
489 .data.pixel_data.vblank_lo = 0x1c,
490 .data.pixel_data.vactive_vblank_hi = 0x10,
491 /* hsync offset 40 pw 128, vsync offset 1 pw 4 */
492 .data.pixel_data.hsync_offset_lo = 0x28,
493 .data.pixel_data.hsync_pulse_width_lo = 0x80,
494 .data.pixel_data.vsync_offset_pulse_width_lo = 0x14,
495 .data.pixel_data.hsync_vsync_offset_pulse_width_hi = 0x00,
496 /* Digital separate syncs, hsync+, vsync+ */
497 .data.pixel_data.misc = 0x1e,
498 }, {
499 .pixel_clock = 0,
500 .data.other_data.type = 0xfd, /* Monitor ranges */
501 .data.other_data.data.range.min_vfreq = 59,
502 .data.other_data.data.range.max_vfreq = 61,
503 .data.other_data.data.range.min_hfreq_khz = 29,
504 .data.other_data.data.range.max_hfreq_khz = 32,
505 .data.other_data.data.range.pixel_clock_mhz = 4, /* 40 MHz */
506 .data.other_data.data.range.flags = 0,
507 .data.other_data.data.range.formula.cvt = {
508 0xa0, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20 },
509 }, {
510 .pixel_clock = 0,
511 .data.other_data.type = 0xfc, /* Model string */
512 .data.other_data.data.str.str = {
513 'P', 'r', 'o', 'j', 'e', 'c', 't', 'o', 'r', '\n',
514 ' ', ' ', ' ' },
515 }, {
516 .pixel_clock = 0,
517 .data.other_data.type = 0xfe, /* Unspecified text / padding */
518 .data.other_data.data.str.str = {
519 '\n', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ',
520 ' ', ' ', ' ' },
521 } },
522 .checksum = 0x13,
523 };
524
gm12u320_conn_get_modes(struct drm_connector * connector)525 static int gm12u320_conn_get_modes(struct drm_connector *connector)
526 {
527 const struct drm_edid *drm_edid;
528 int count;
529
530 drm_edid = drm_edid_alloc(&gm12u320_edid, sizeof(gm12u320_edid));
531 drm_edid_connector_update(connector, drm_edid);
532 count = drm_edid_connector_add_modes(connector);
533 drm_edid_free(drm_edid);
534
535 return count;
536 }
537
538 static const struct drm_connector_helper_funcs gm12u320_conn_helper_funcs = {
539 .get_modes = gm12u320_conn_get_modes,
540 };
541
542 static const struct drm_connector_funcs gm12u320_conn_funcs = {
543 .fill_modes = drm_helper_probe_single_connector_modes,
544 .destroy = drm_connector_cleanup,
545 .reset = drm_atomic_helper_connector_reset,
546 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
547 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
548 };
549
gm12u320_conn_init(struct gm12u320_device * gm12u320)550 static int gm12u320_conn_init(struct gm12u320_device *gm12u320)
551 {
552 drm_connector_helper_add(&gm12u320->conn, &gm12u320_conn_helper_funcs);
553 return drm_connector_init(&gm12u320->dev, &gm12u320->conn,
554 &gm12u320_conn_funcs, DRM_MODE_CONNECTOR_VGA);
555 }
556
557 /* ------------------------------------------------------------------ */
558 /* gm12u320 (simple) display pipe */
559
gm12u320_pipe_enable(struct drm_simple_display_pipe * pipe,struct drm_crtc_state * crtc_state,struct drm_plane_state * plane_state)560 static void gm12u320_pipe_enable(struct drm_simple_display_pipe *pipe,
561 struct drm_crtc_state *crtc_state,
562 struct drm_plane_state *plane_state)
563 {
564 struct drm_rect rect = { 0, 0, GM12U320_USER_WIDTH, GM12U320_HEIGHT };
565 struct gm12u320_device *gm12u320 = to_gm12u320(pipe->crtc.dev);
566 struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(plane_state);
567
568 gm12u320->fb_update.draw_status_timeout = FIRST_FRAME_TIMEOUT;
569 gm12u320_fb_mark_dirty(plane_state->fb, &shadow_plane_state->data[0], &rect);
570 }
571
gm12u320_pipe_disable(struct drm_simple_display_pipe * pipe)572 static void gm12u320_pipe_disable(struct drm_simple_display_pipe *pipe)
573 {
574 struct gm12u320_device *gm12u320 = to_gm12u320(pipe->crtc.dev);
575
576 gm12u320_stop_fb_update(gm12u320);
577 }
578
gm12u320_pipe_update(struct drm_simple_display_pipe * pipe,struct drm_plane_state * old_state)579 static void gm12u320_pipe_update(struct drm_simple_display_pipe *pipe,
580 struct drm_plane_state *old_state)
581 {
582 struct drm_plane_state *state = pipe->plane.state;
583 struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(state);
584 struct drm_rect rect;
585
586 if (drm_atomic_helper_damage_merged(old_state, state, &rect))
587 gm12u320_fb_mark_dirty(state->fb, &shadow_plane_state->data[0], &rect);
588 }
589
590 static const struct drm_simple_display_pipe_funcs gm12u320_pipe_funcs = {
591 .enable = gm12u320_pipe_enable,
592 .disable = gm12u320_pipe_disable,
593 .update = gm12u320_pipe_update,
594 DRM_GEM_SIMPLE_DISPLAY_PIPE_SHADOW_PLANE_FUNCS,
595 };
596
597 static const uint32_t gm12u320_pipe_formats[] = {
598 DRM_FORMAT_XRGB8888,
599 };
600
601 static const uint64_t gm12u320_pipe_modifiers[] = {
602 DRM_FORMAT_MOD_LINEAR,
603 DRM_FORMAT_MOD_INVALID
604 };
605
606 /*
607 * FIXME: Dma-buf sharing requires DMA support by the importing device.
608 * This function is a workaround to make USB devices work as well.
609 * See todo.rst for how to fix the issue in the dma-buf framework.
610 */
gm12u320_gem_prime_import(struct drm_device * dev,struct dma_buf * dma_buf)611 static struct drm_gem_object *gm12u320_gem_prime_import(struct drm_device *dev,
612 struct dma_buf *dma_buf)
613 {
614 struct gm12u320_device *gm12u320 = to_gm12u320(dev);
615
616 if (!gm12u320->dmadev)
617 return ERR_PTR(-ENODEV);
618
619 return drm_gem_prime_import_dev(dev, dma_buf, gm12u320->dmadev);
620 }
621
622 DEFINE_DRM_GEM_FOPS(gm12u320_fops);
623
624 static const struct drm_driver gm12u320_drm_driver = {
625 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
626
627 .name = DRIVER_NAME,
628 .desc = DRIVER_DESC,
629 .date = DRIVER_DATE,
630 .major = DRIVER_MAJOR,
631 .minor = DRIVER_MINOR,
632
633 .fops = &gm12u320_fops,
634 DRM_GEM_SHMEM_DRIVER_OPS,
635 .gem_prime_import = gm12u320_gem_prime_import,
636 DRM_FBDEV_SHMEM_DRIVER_OPS,
637 };
638
639 static const struct drm_mode_config_funcs gm12u320_mode_config_funcs = {
640 .fb_create = drm_gem_fb_create_with_dirty,
641 .atomic_check = drm_atomic_helper_check,
642 .atomic_commit = drm_atomic_helper_commit,
643 };
644
gm12u320_usb_probe(struct usb_interface * interface,const struct usb_device_id * id)645 static int gm12u320_usb_probe(struct usb_interface *interface,
646 const struct usb_device_id *id)
647 {
648 struct gm12u320_device *gm12u320;
649 struct drm_device *dev;
650 int ret;
651
652 /*
653 * The gm12u320 presents itself to the system as 2 usb mass-storage
654 * interfaces, we only care about / need the first one.
655 */
656 if (interface->cur_altsetting->desc.bInterfaceNumber != 0)
657 return -ENODEV;
658
659 gm12u320 = devm_drm_dev_alloc(&interface->dev, &gm12u320_drm_driver,
660 struct gm12u320_device, dev);
661 if (IS_ERR(gm12u320))
662 return PTR_ERR(gm12u320);
663 dev = &gm12u320->dev;
664
665 gm12u320->dmadev = usb_intf_get_dma_device(to_usb_interface(dev->dev));
666 if (!gm12u320->dmadev)
667 drm_warn(dev, "buffer sharing not supported"); /* not an error */
668
669 INIT_DELAYED_WORK(&gm12u320->fb_update.work, gm12u320_fb_update_work);
670 mutex_init(&gm12u320->fb_update.lock);
671
672 ret = drmm_mode_config_init(dev);
673 if (ret)
674 goto err_put_device;
675
676 dev->mode_config.min_width = GM12U320_USER_WIDTH;
677 dev->mode_config.max_width = GM12U320_USER_WIDTH;
678 dev->mode_config.min_height = GM12U320_HEIGHT;
679 dev->mode_config.max_height = GM12U320_HEIGHT;
680 dev->mode_config.funcs = &gm12u320_mode_config_funcs;
681
682 ret = gm12u320_usb_alloc(gm12u320);
683 if (ret)
684 goto err_put_device;
685
686 ret = gm12u320_set_ecomode(gm12u320);
687 if (ret)
688 goto err_put_device;
689
690 ret = gm12u320_conn_init(gm12u320);
691 if (ret)
692 goto err_put_device;
693
694 ret = drm_simple_display_pipe_init(&gm12u320->dev,
695 &gm12u320->pipe,
696 &gm12u320_pipe_funcs,
697 gm12u320_pipe_formats,
698 ARRAY_SIZE(gm12u320_pipe_formats),
699 gm12u320_pipe_modifiers,
700 &gm12u320->conn);
701 if (ret)
702 goto err_put_device;
703
704 drm_mode_config_reset(dev);
705
706 usb_set_intfdata(interface, dev);
707 ret = drm_dev_register(dev, 0);
708 if (ret)
709 goto err_put_device;
710
711 drm_client_setup(dev, NULL);
712
713 return 0;
714
715 err_put_device:
716 put_device(gm12u320->dmadev);
717 return ret;
718 }
719
gm12u320_usb_disconnect(struct usb_interface * interface)720 static void gm12u320_usb_disconnect(struct usb_interface *interface)
721 {
722 struct drm_device *dev = usb_get_intfdata(interface);
723 struct gm12u320_device *gm12u320 = to_gm12u320(dev);
724
725 put_device(gm12u320->dmadev);
726 gm12u320->dmadev = NULL;
727 drm_dev_unplug(dev);
728 drm_atomic_helper_shutdown(dev);
729 }
730
gm12u320_suspend(struct usb_interface * interface,pm_message_t message)731 static int gm12u320_suspend(struct usb_interface *interface,
732 pm_message_t message)
733 {
734 struct drm_device *dev = usb_get_intfdata(interface);
735
736 return drm_mode_config_helper_suspend(dev);
737 }
738
gm12u320_resume(struct usb_interface * interface)739 static int gm12u320_resume(struct usb_interface *interface)
740 {
741 struct drm_device *dev = usb_get_intfdata(interface);
742 struct gm12u320_device *gm12u320 = to_gm12u320(dev);
743
744 gm12u320_set_ecomode(gm12u320);
745
746 return drm_mode_config_helper_resume(dev);
747 }
748
749 static const struct usb_device_id id_table[] = {
750 { USB_DEVICE(0x1de1, 0xc102) },
751 {},
752 };
753 MODULE_DEVICE_TABLE(usb, id_table);
754
755 static struct usb_driver gm12u320_usb_driver = {
756 .name = "gm12u320",
757 .probe = gm12u320_usb_probe,
758 .disconnect = gm12u320_usb_disconnect,
759 .id_table = id_table,
760 .suspend = pm_ptr(gm12u320_suspend),
761 .resume = pm_ptr(gm12u320_resume),
762 .reset_resume = pm_ptr(gm12u320_resume),
763 };
764
765 module_usb_driver(gm12u320_usb_driver);
766 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
767 MODULE_DESCRIPTION("GM12U320 driver for USB projectors");
768 MODULE_LICENSE("GPL");
769