1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright (c) 2018, The Linux Foundation. All rights reserved.
4  * Copyright (c) 2019-2020. Linaro Limited.
5  */
6 
7 #include <linux/firmware.h>
8 #include <linux/gpio/consumer.h>
9 #include <linux/interrupt.h>
10 #include <linux/module.h>
11 #include <linux/mutex.h>
12 #include <linux/of_graph.h>
13 #include <linux/platform_device.h>
14 #include <linux/regmap.h>
15 #include <linux/regulator/consumer.h>
16 #include <linux/wait.h>
17 #include <linux/workqueue.h>
18 
19 #include <sound/hdmi-codec.h>
20 
21 #include <drm/drm_atomic_helper.h>
22 #include <drm/drm_bridge.h>
23 #include <drm/drm_mipi_dsi.h>
24 #include <drm/drm_print.h>
25 #include <drm/drm_probe_helper.h>
26 
27 #define EDID_BLOCK_SIZE	128
28 #define EDID_NUM_BLOCKS	2
29 
30 struct lt9611uxc {
31 	struct device *dev;
32 	struct drm_bridge bridge;
33 	struct drm_connector connector;
34 
35 	struct regmap *regmap;
36 	/* Protects all accesses to registers by stopping the on-chip MCU */
37 	struct mutex ocm_lock;
38 
39 	struct wait_queue_head wq;
40 	struct work_struct work;
41 
42 	struct device_node *dsi0_node;
43 	struct device_node *dsi1_node;
44 	struct mipi_dsi_device *dsi0;
45 	struct mipi_dsi_device *dsi1;
46 	struct platform_device *audio_pdev;
47 
48 	struct gpio_desc *reset_gpio;
49 	struct gpio_desc *enable_gpio;
50 
51 	struct regulator_bulk_data supplies[2];
52 
53 	struct i2c_client *client;
54 
55 	bool hpd_supported;
56 	bool edid_read;
57 	/* can be accessed from different threads, so protect this with ocm_lock */
58 	bool hdmi_connected;
59 	uint8_t fw_version;
60 };
61 
62 #define LT9611_PAGE_CONTROL	0xff
63 
64 static const struct regmap_range_cfg lt9611uxc_ranges[] = {
65 	{
66 		.name = "register_range",
67 		.range_min =  0,
68 		.range_max = 0xd0ff,
69 		.selector_reg = LT9611_PAGE_CONTROL,
70 		.selector_mask = 0xff,
71 		.selector_shift = 0,
72 		.window_start = 0,
73 		.window_len = 0x100,
74 	},
75 };
76 
77 static const struct regmap_config lt9611uxc_regmap_config = {
78 	.reg_bits = 8,
79 	.val_bits = 8,
80 	.max_register = 0xffff,
81 	.ranges = lt9611uxc_ranges,
82 	.num_ranges = ARRAY_SIZE(lt9611uxc_ranges),
83 };
84 
85 struct lt9611uxc_mode {
86 	u16 hdisplay;
87 	u16 vdisplay;
88 	u8 vrefresh;
89 };
90 
91 /*
92  * This chip supports only a fixed set of modes.
93  * Enumerate them here to check whether the mode is supported.
94  */
95 static struct lt9611uxc_mode lt9611uxc_modes[] = {
96 	{ 1920, 1080, 60 },
97 	{ 1920, 1080, 30 },
98 	{ 1920, 1080, 25 },
99 	{ 1366, 768, 60 },
100 	{ 1360, 768, 60 },
101 	{ 1280, 1024, 60 },
102 	{ 1280, 800, 60 },
103 	{ 1280, 720, 60 },
104 	{ 1280, 720, 50 },
105 	{ 1280, 720, 30 },
106 	{ 1152, 864, 60 },
107 	{ 1024, 768, 60 },
108 	{ 800, 600, 60 },
109 	{ 720, 576, 50 },
110 	{ 720, 480, 60 },
111 	{ 640, 480, 60 },
112 };
113 
114 static struct lt9611uxc *bridge_to_lt9611uxc(struct drm_bridge *bridge)
115 {
116 	return container_of(bridge, struct lt9611uxc, bridge);
117 }
118 
119 static struct lt9611uxc *connector_to_lt9611uxc(struct drm_connector *connector)
120 {
121 	return container_of(connector, struct lt9611uxc, connector);
122 }
123 
124 static void lt9611uxc_lock(struct lt9611uxc *lt9611uxc)
125 {
126 	mutex_lock(&lt9611uxc->ocm_lock);
127 	regmap_write(lt9611uxc->regmap, 0x80ee, 0x01);
128 }
129 
130 static void lt9611uxc_unlock(struct lt9611uxc *lt9611uxc)
131 {
132 	regmap_write(lt9611uxc->regmap, 0x80ee, 0x00);
133 	msleep(50);
134 	mutex_unlock(&lt9611uxc->ocm_lock);
135 }
136 
137 static irqreturn_t lt9611uxc_irq_thread_handler(int irq, void *dev_id)
138 {
139 	struct lt9611uxc *lt9611uxc = dev_id;
140 	unsigned int irq_status = 0;
141 	unsigned int hpd_status = 0;
142 
143 	lt9611uxc_lock(lt9611uxc);
144 
145 	regmap_read(lt9611uxc->regmap, 0xb022, &irq_status);
146 	regmap_read(lt9611uxc->regmap, 0xb023, &hpd_status);
147 	if (irq_status)
148 		regmap_write(lt9611uxc->regmap, 0xb022, 0);
149 
150 	if (irq_status & BIT(0)) {
151 		lt9611uxc->edid_read = !!(hpd_status & BIT(0));
152 		wake_up_all(&lt9611uxc->wq);
153 	}
154 
155 	if (irq_status & BIT(1)) {
156 		lt9611uxc->hdmi_connected = hpd_status & BIT(1);
157 		schedule_work(&lt9611uxc->work);
158 	}
159 
160 	lt9611uxc_unlock(lt9611uxc);
161 
162 	return IRQ_HANDLED;
163 }
164 
165 static void lt9611uxc_hpd_work(struct work_struct *work)
166 {
167 	struct lt9611uxc *lt9611uxc = container_of(work, struct lt9611uxc, work);
168 	bool connected;
169 
170 	if (lt9611uxc->connector.dev) {
171 		if (lt9611uxc->connector.dev->mode_config.funcs)
172 			drm_kms_helper_hotplug_event(lt9611uxc->connector.dev);
173 	} else {
174 
175 		mutex_lock(&lt9611uxc->ocm_lock);
176 		connected = lt9611uxc->hdmi_connected;
177 		mutex_unlock(&lt9611uxc->ocm_lock);
178 
179 		drm_bridge_hpd_notify(&lt9611uxc->bridge,
180 				      connected ?
181 				      connector_status_connected :
182 				      connector_status_disconnected);
183 	}
184 }
185 
186 static void lt9611uxc_reset(struct lt9611uxc *lt9611uxc)
187 {
188 	gpiod_set_value_cansleep(lt9611uxc->reset_gpio, 1);
189 	msleep(20);
190 
191 	gpiod_set_value_cansleep(lt9611uxc->reset_gpio, 0);
192 	msleep(20);
193 
194 	gpiod_set_value_cansleep(lt9611uxc->reset_gpio, 1);
195 	msleep(300);
196 }
197 
198 static void lt9611uxc_assert_5v(struct lt9611uxc *lt9611uxc)
199 {
200 	if (!lt9611uxc->enable_gpio)
201 		return;
202 
203 	gpiod_set_value_cansleep(lt9611uxc->enable_gpio, 1);
204 	msleep(20);
205 }
206 
207 static int lt9611uxc_regulator_init(struct lt9611uxc *lt9611uxc)
208 {
209 	int ret;
210 
211 	lt9611uxc->supplies[0].supply = "vdd";
212 	lt9611uxc->supplies[1].supply = "vcc";
213 
214 	ret = devm_regulator_bulk_get(lt9611uxc->dev, 2, lt9611uxc->supplies);
215 	if (ret < 0)
216 		return ret;
217 
218 	return regulator_set_load(lt9611uxc->supplies[0].consumer, 200000);
219 }
220 
221 static int lt9611uxc_regulator_enable(struct lt9611uxc *lt9611uxc)
222 {
223 	int ret;
224 
225 	ret = regulator_enable(lt9611uxc->supplies[0].consumer);
226 	if (ret < 0)
227 		return ret;
228 
229 	usleep_range(1000, 10000); /* 50000 according to dtsi */
230 
231 	ret = regulator_enable(lt9611uxc->supplies[1].consumer);
232 	if (ret < 0) {
233 		regulator_disable(lt9611uxc->supplies[0].consumer);
234 		return ret;
235 	}
236 
237 	return 0;
238 }
239 
240 static struct lt9611uxc_mode *lt9611uxc_find_mode(const struct drm_display_mode *mode)
241 {
242 	int i;
243 
244 	for (i = 0; i < ARRAY_SIZE(lt9611uxc_modes); i++) {
245 		if (lt9611uxc_modes[i].hdisplay == mode->hdisplay &&
246 		    lt9611uxc_modes[i].vdisplay == mode->vdisplay &&
247 		    lt9611uxc_modes[i].vrefresh == drm_mode_vrefresh(mode)) {
248 			return &lt9611uxc_modes[i];
249 		}
250 	}
251 
252 	return NULL;
253 }
254 
255 static struct mipi_dsi_device *lt9611uxc_attach_dsi(struct lt9611uxc *lt9611uxc,
256 						    struct device_node *dsi_node)
257 {
258 	const struct mipi_dsi_device_info info = { "lt9611uxc", 0, NULL };
259 	struct mipi_dsi_device *dsi;
260 	struct mipi_dsi_host *host;
261 	struct device *dev = lt9611uxc->dev;
262 	int ret;
263 
264 	host = of_find_mipi_dsi_host_by_node(dsi_node);
265 	if (!host) {
266 		dev_err(dev, "failed to find dsi host\n");
267 		return ERR_PTR(-EPROBE_DEFER);
268 	}
269 
270 	dsi = devm_mipi_dsi_device_register_full(dev, host, &info);
271 	if (IS_ERR(dsi)) {
272 		dev_err(dev, "failed to create dsi device\n");
273 		return dsi;
274 	}
275 
276 	dsi->lanes = 4;
277 	dsi->format = MIPI_DSI_FMT_RGB888;
278 	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_SYNC_PULSE |
279 			  MIPI_DSI_MODE_VIDEO_HSE;
280 
281 	ret = devm_mipi_dsi_attach(dev, dsi);
282 	if (ret < 0) {
283 		dev_err(dev, "failed to attach dsi to host\n");
284 		return ERR_PTR(ret);
285 	}
286 
287 	return dsi;
288 }
289 
290 static int lt9611uxc_connector_get_modes(struct drm_connector *connector)
291 {
292 	struct lt9611uxc *lt9611uxc = connector_to_lt9611uxc(connector);
293 	unsigned int count;
294 	struct edid *edid;
295 
296 	edid = lt9611uxc->bridge.funcs->get_edid(&lt9611uxc->bridge, connector);
297 	drm_connector_update_edid_property(connector, edid);
298 	count = drm_add_edid_modes(connector, edid);
299 	kfree(edid);
300 
301 	return count;
302 }
303 
304 static enum drm_connector_status lt9611uxc_connector_detect(struct drm_connector *connector,
305 							    bool force)
306 {
307 	struct lt9611uxc *lt9611uxc = connector_to_lt9611uxc(connector);
308 
309 	return lt9611uxc->bridge.funcs->detect(&lt9611uxc->bridge);
310 }
311 
312 static enum drm_mode_status lt9611uxc_connector_mode_valid(struct drm_connector *connector,
313 							   struct drm_display_mode *mode)
314 {
315 	struct lt9611uxc_mode *lt9611uxc_mode = lt9611uxc_find_mode(mode);
316 
317 	return lt9611uxc_mode ? MODE_OK : MODE_BAD;
318 }
319 
320 static const struct drm_connector_helper_funcs lt9611uxc_bridge_connector_helper_funcs = {
321 	.get_modes = lt9611uxc_connector_get_modes,
322 	.mode_valid = lt9611uxc_connector_mode_valid,
323 };
324 
325 static const struct drm_connector_funcs lt9611uxc_bridge_connector_funcs = {
326 	.fill_modes = drm_helper_probe_single_connector_modes,
327 	.detect = lt9611uxc_connector_detect,
328 	.destroy = drm_connector_cleanup,
329 	.reset = drm_atomic_helper_connector_reset,
330 	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
331 	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
332 };
333 
334 static int lt9611uxc_connector_init(struct drm_bridge *bridge, struct lt9611uxc *lt9611uxc)
335 {
336 	int ret;
337 
338 	if (!bridge->encoder) {
339 		DRM_ERROR("Parent encoder object not found");
340 		return -ENODEV;
341 	}
342 
343 	lt9611uxc->connector.polled = DRM_CONNECTOR_POLL_HPD;
344 
345 	drm_connector_helper_add(&lt9611uxc->connector,
346 				 &lt9611uxc_bridge_connector_helper_funcs);
347 	ret = drm_connector_init(bridge->dev, &lt9611uxc->connector,
348 				 &lt9611uxc_bridge_connector_funcs,
349 				 DRM_MODE_CONNECTOR_HDMIA);
350 	if (ret) {
351 		DRM_ERROR("Failed to initialize connector with drm\n");
352 		return ret;
353 	}
354 
355 	return drm_connector_attach_encoder(&lt9611uxc->connector, bridge->encoder);
356 }
357 
358 static int lt9611uxc_bridge_attach(struct drm_bridge *bridge,
359 				   enum drm_bridge_attach_flags flags)
360 {
361 	struct lt9611uxc *lt9611uxc = bridge_to_lt9611uxc(bridge);
362 	int ret;
363 
364 	if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
365 		ret = lt9611uxc_connector_init(bridge, lt9611uxc);
366 		if (ret < 0)
367 			return ret;
368 	}
369 
370 	return 0;
371 }
372 
373 static enum drm_mode_status
374 lt9611uxc_bridge_mode_valid(struct drm_bridge *bridge,
375 			    const struct drm_display_info *info,
376 			    const struct drm_display_mode *mode)
377 {
378 	struct lt9611uxc_mode *lt9611uxc_mode;
379 
380 	lt9611uxc_mode = lt9611uxc_find_mode(mode);
381 
382 	return lt9611uxc_mode ? MODE_OK : MODE_BAD;
383 }
384 
385 static void lt9611uxc_video_setup(struct lt9611uxc *lt9611uxc,
386 				  const struct drm_display_mode *mode)
387 {
388 	u32 h_total, hactive, hsync_len, hfront_porch;
389 	u32 v_total, vactive, vsync_len, vfront_porch;
390 
391 	h_total = mode->htotal;
392 	v_total = mode->vtotal;
393 
394 	hactive = mode->hdisplay;
395 	hsync_len = mode->hsync_end - mode->hsync_start;
396 	hfront_porch = mode->hsync_start - mode->hdisplay;
397 
398 	vactive = mode->vdisplay;
399 	vsync_len = mode->vsync_end - mode->vsync_start;
400 	vfront_porch = mode->vsync_start - mode->vdisplay;
401 
402 	regmap_write(lt9611uxc->regmap, 0xd00d, (u8)(v_total / 256));
403 	regmap_write(lt9611uxc->regmap, 0xd00e, (u8)(v_total % 256));
404 
405 	regmap_write(lt9611uxc->regmap, 0xd00f, (u8)(vactive / 256));
406 	regmap_write(lt9611uxc->regmap, 0xd010, (u8)(vactive % 256));
407 
408 	regmap_write(lt9611uxc->regmap, 0xd011, (u8)(h_total / 256));
409 	regmap_write(lt9611uxc->regmap, 0xd012, (u8)(h_total % 256));
410 
411 	regmap_write(lt9611uxc->regmap, 0xd013, (u8)(hactive / 256));
412 	regmap_write(lt9611uxc->regmap, 0xd014, (u8)(hactive % 256));
413 
414 	regmap_write(lt9611uxc->regmap, 0xd015, (u8)(vsync_len % 256));
415 
416 	regmap_update_bits(lt9611uxc->regmap, 0xd016, 0xf, (u8)(hsync_len / 256));
417 	regmap_write(lt9611uxc->regmap, 0xd017, (u8)(hsync_len % 256));
418 
419 	regmap_update_bits(lt9611uxc->regmap, 0xd018, 0xf, (u8)(vfront_porch / 256));
420 	regmap_write(lt9611uxc->regmap, 0xd019, (u8)(vfront_porch % 256));
421 
422 	regmap_update_bits(lt9611uxc->regmap, 0xd01a, 0xf, (u8)(hfront_porch / 256));
423 	regmap_write(lt9611uxc->regmap, 0xd01b, (u8)(hfront_porch % 256));
424 }
425 
426 static void lt9611uxc_bridge_mode_set(struct drm_bridge *bridge,
427 				      const struct drm_display_mode *mode,
428 				      const struct drm_display_mode *adj_mode)
429 {
430 	struct lt9611uxc *lt9611uxc = bridge_to_lt9611uxc(bridge);
431 
432 	lt9611uxc_lock(lt9611uxc);
433 	lt9611uxc_video_setup(lt9611uxc, mode);
434 	lt9611uxc_unlock(lt9611uxc);
435 }
436 
437 static enum drm_connector_status lt9611uxc_bridge_detect(struct drm_bridge *bridge)
438 {
439 	struct lt9611uxc *lt9611uxc = bridge_to_lt9611uxc(bridge);
440 	unsigned int reg_val = 0;
441 	int ret;
442 	bool connected = true;
443 
444 	lt9611uxc_lock(lt9611uxc);
445 
446 	if (lt9611uxc->hpd_supported) {
447 		ret = regmap_read(lt9611uxc->regmap, 0xb023, &reg_val);
448 
449 		if (ret)
450 			dev_err(lt9611uxc->dev, "failed to read hpd status: %d\n", ret);
451 		else
452 			connected  = reg_val & BIT(1);
453 	}
454 	lt9611uxc->hdmi_connected = connected;
455 
456 	lt9611uxc_unlock(lt9611uxc);
457 
458 	return connected ?  connector_status_connected :
459 				connector_status_disconnected;
460 }
461 
462 static int lt9611uxc_wait_for_edid(struct lt9611uxc *lt9611uxc)
463 {
464 	return wait_event_interruptible_timeout(lt9611uxc->wq, lt9611uxc->edid_read,
465 			msecs_to_jiffies(500));
466 }
467 
468 static int lt9611uxc_get_edid_block(void *data, u8 *buf, unsigned int block, size_t len)
469 {
470 	struct lt9611uxc *lt9611uxc = data;
471 	int ret;
472 
473 	if (len > EDID_BLOCK_SIZE)
474 		return -EINVAL;
475 
476 	if (block >= EDID_NUM_BLOCKS)
477 		return -EINVAL;
478 
479 	lt9611uxc_lock(lt9611uxc);
480 
481 	regmap_write(lt9611uxc->regmap, 0xb00b, 0x10);
482 
483 	regmap_write(lt9611uxc->regmap, 0xb00a, block * EDID_BLOCK_SIZE);
484 
485 	ret = regmap_noinc_read(lt9611uxc->regmap, 0xb0b0, buf, len);
486 	if (ret)
487 		dev_err(lt9611uxc->dev, "edid read failed: %d\n", ret);
488 
489 	lt9611uxc_unlock(lt9611uxc);
490 
491 	return 0;
492 };
493 
494 static struct edid *lt9611uxc_bridge_get_edid(struct drm_bridge *bridge,
495 					      struct drm_connector *connector)
496 {
497 	struct lt9611uxc *lt9611uxc = bridge_to_lt9611uxc(bridge);
498 	int ret;
499 
500 	ret = lt9611uxc_wait_for_edid(lt9611uxc);
501 	if (ret < 0) {
502 		dev_err(lt9611uxc->dev, "wait for EDID failed: %d\n", ret);
503 		return NULL;
504 	} else if (ret == 0) {
505 		dev_err(lt9611uxc->dev, "wait for EDID timeout\n");
506 		return NULL;
507 	}
508 
509 	return drm_do_get_edid(connector, lt9611uxc_get_edid_block, lt9611uxc);
510 }
511 
512 static const struct drm_bridge_funcs lt9611uxc_bridge_funcs = {
513 	.attach = lt9611uxc_bridge_attach,
514 	.mode_valid = lt9611uxc_bridge_mode_valid,
515 	.mode_set = lt9611uxc_bridge_mode_set,
516 	.detect = lt9611uxc_bridge_detect,
517 	.get_edid = lt9611uxc_bridge_get_edid,
518 };
519 
520 static int lt9611uxc_parse_dt(struct device *dev,
521 			      struct lt9611uxc *lt9611uxc)
522 {
523 	lt9611uxc->dsi0_node = of_graph_get_remote_node(dev->of_node, 0, -1);
524 	if (!lt9611uxc->dsi0_node) {
525 		dev_err(lt9611uxc->dev, "failed to get remote node for primary dsi\n");
526 		return -ENODEV;
527 	}
528 
529 	lt9611uxc->dsi1_node = of_graph_get_remote_node(dev->of_node, 1, -1);
530 
531 	return 0;
532 }
533 
534 static int lt9611uxc_gpio_init(struct lt9611uxc *lt9611uxc)
535 {
536 	struct device *dev = lt9611uxc->dev;
537 
538 	lt9611uxc->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
539 	if (IS_ERR(lt9611uxc->reset_gpio)) {
540 		dev_err(dev, "failed to acquire reset gpio\n");
541 		return PTR_ERR(lt9611uxc->reset_gpio);
542 	}
543 
544 	lt9611uxc->enable_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_LOW);
545 	if (IS_ERR(lt9611uxc->enable_gpio)) {
546 		dev_err(dev, "failed to acquire enable gpio\n");
547 		return PTR_ERR(lt9611uxc->enable_gpio);
548 	}
549 
550 	return 0;
551 }
552 
553 static int lt9611uxc_read_device_rev(struct lt9611uxc *lt9611uxc)
554 {
555 	unsigned int rev0, rev1, rev2;
556 	int ret;
557 
558 	lt9611uxc_lock(lt9611uxc);
559 
560 	ret = regmap_read(lt9611uxc->regmap, 0x8100, &rev0);
561 	ret |= regmap_read(lt9611uxc->regmap, 0x8101, &rev1);
562 	ret |= regmap_read(lt9611uxc->regmap, 0x8102, &rev2);
563 	if (ret)
564 		dev_err(lt9611uxc->dev, "failed to read revision: %d\n", ret);
565 	else
566 		dev_info(lt9611uxc->dev, "LT9611 revision: 0x%02x.%02x.%02x\n", rev0, rev1, rev2);
567 
568 	lt9611uxc_unlock(lt9611uxc);
569 
570 	return ret;
571 }
572 
573 static int lt9611uxc_read_version(struct lt9611uxc *lt9611uxc)
574 {
575 	unsigned int rev;
576 	int ret;
577 
578 	lt9611uxc_lock(lt9611uxc);
579 
580 	ret = regmap_read(lt9611uxc->regmap, 0xb021, &rev);
581 	if (ret)
582 		dev_err(lt9611uxc->dev, "failed to read revision: %d\n", ret);
583 	else
584 		dev_info(lt9611uxc->dev, "LT9611 version: 0x%02x\n", rev);
585 
586 	lt9611uxc_unlock(lt9611uxc);
587 
588 	return ret < 0 ? ret : rev;
589 }
590 
591 static int lt9611uxc_hdmi_hw_params(struct device *dev, void *data,
592 				    struct hdmi_codec_daifmt *fmt,
593 				    struct hdmi_codec_params *hparms)
594 {
595 	/*
596 	 * LT9611UXC will automatically detect rate and sample size, so no need
597 	 * to setup anything here.
598 	 */
599 	return 0;
600 }
601 
602 static void lt9611uxc_audio_shutdown(struct device *dev, void *data)
603 {
604 }
605 
606 static int lt9611uxc_hdmi_i2s_get_dai_id(struct snd_soc_component *component,
607 					 struct device_node *endpoint)
608 {
609 	struct of_endpoint of_ep;
610 	int ret;
611 
612 	ret = of_graph_parse_endpoint(endpoint, &of_ep);
613 	if (ret < 0)
614 		return ret;
615 
616 	/*
617 	 * HDMI sound should be located as reg = <2>
618 	 * Then, it is sound port 0
619 	 */
620 	if (of_ep.port == 2)
621 		return 0;
622 
623 	return -EINVAL;
624 }
625 
626 static const struct hdmi_codec_ops lt9611uxc_codec_ops = {
627 	.hw_params	= lt9611uxc_hdmi_hw_params,
628 	.audio_shutdown = lt9611uxc_audio_shutdown,
629 	.get_dai_id	= lt9611uxc_hdmi_i2s_get_dai_id,
630 };
631 
632 static int lt9611uxc_audio_init(struct device *dev, struct lt9611uxc *lt9611uxc)
633 {
634 	struct hdmi_codec_pdata codec_data = {
635 		.ops = &lt9611uxc_codec_ops,
636 		.max_i2s_channels = 2,
637 		.i2s = 1,
638 		.data = lt9611uxc,
639 	};
640 
641 	lt9611uxc->audio_pdev =
642 		platform_device_register_data(dev, HDMI_CODEC_DRV_NAME,
643 					      PLATFORM_DEVID_AUTO,
644 					      &codec_data, sizeof(codec_data));
645 
646 	return PTR_ERR_OR_ZERO(lt9611uxc->audio_pdev);
647 }
648 
649 static void lt9611uxc_audio_exit(struct lt9611uxc *lt9611uxc)
650 {
651 	if (lt9611uxc->audio_pdev) {
652 		platform_device_unregister(lt9611uxc->audio_pdev);
653 		lt9611uxc->audio_pdev = NULL;
654 	}
655 }
656 
657 #define LT9611UXC_FW_PAGE_SIZE 32
658 static void lt9611uxc_firmware_write_page(struct lt9611uxc *lt9611uxc, u16 addr, const u8 *buf)
659 {
660 	struct reg_sequence seq_write_prepare[] = {
661 		REG_SEQ0(0x805a, 0x04),
662 		REG_SEQ0(0x805a, 0x00),
663 
664 		REG_SEQ0(0x805e, 0xdf),
665 		REG_SEQ0(0x805a, 0x20),
666 		REG_SEQ0(0x805a, 0x00),
667 		REG_SEQ0(0x8058, 0x21),
668 	};
669 
670 	struct reg_sequence seq_write_addr[] = {
671 		REG_SEQ0(0x805b, (addr >> 16) & 0xff),
672 		REG_SEQ0(0x805c, (addr >> 8) & 0xff),
673 		REG_SEQ0(0x805d, addr & 0xff),
674 		REG_SEQ0(0x805a, 0x10),
675 		REG_SEQ0(0x805a, 0x00),
676 	};
677 
678 	regmap_write(lt9611uxc->regmap, 0x8108, 0xbf);
679 	msleep(20);
680 	regmap_write(lt9611uxc->regmap, 0x8108, 0xff);
681 	msleep(20);
682 	regmap_multi_reg_write(lt9611uxc->regmap, seq_write_prepare, ARRAY_SIZE(seq_write_prepare));
683 	regmap_noinc_write(lt9611uxc->regmap, 0x8059, buf, LT9611UXC_FW_PAGE_SIZE);
684 	regmap_multi_reg_write(lt9611uxc->regmap, seq_write_addr, ARRAY_SIZE(seq_write_addr));
685 	msleep(20);
686 }
687 
688 static void lt9611uxc_firmware_read_page(struct lt9611uxc *lt9611uxc, u16 addr, char *buf)
689 {
690 	struct reg_sequence seq_read_page[] = {
691 		REG_SEQ0(0x805a, 0xa0),
692 		REG_SEQ0(0x805a, 0x80),
693 		REG_SEQ0(0x805b, (addr >> 16) & 0xff),
694 		REG_SEQ0(0x805c, (addr >> 8) & 0xff),
695 		REG_SEQ0(0x805d, addr & 0xff),
696 		REG_SEQ0(0x805a, 0x90),
697 		REG_SEQ0(0x805a, 0x80),
698 		REG_SEQ0(0x8058, 0x21),
699 	};
700 
701 	regmap_multi_reg_write(lt9611uxc->regmap, seq_read_page, ARRAY_SIZE(seq_read_page));
702 	regmap_noinc_read(lt9611uxc->regmap, 0x805f, buf, LT9611UXC_FW_PAGE_SIZE);
703 }
704 
705 static char *lt9611uxc_firmware_read(struct lt9611uxc *lt9611uxc, size_t size)
706 {
707 	struct reg_sequence seq_read_setup[] = {
708 		REG_SEQ0(0x805a, 0x84),
709 		REG_SEQ0(0x805a, 0x80),
710 	};
711 
712 	char *readbuf;
713 	u16 offset;
714 
715 	readbuf = kzalloc(ALIGN(size, 32), GFP_KERNEL);
716 	if (!readbuf)
717 		return NULL;
718 
719 	regmap_multi_reg_write(lt9611uxc->regmap, seq_read_setup, ARRAY_SIZE(seq_read_setup));
720 
721 	for (offset = 0;
722 	     offset < size;
723 	     offset += LT9611UXC_FW_PAGE_SIZE)
724 		lt9611uxc_firmware_read_page(lt9611uxc, offset, &readbuf[offset]);
725 
726 	return readbuf;
727 }
728 
729 static int lt9611uxc_firmware_update(struct lt9611uxc *lt9611uxc)
730 {
731 	int ret;
732 	u16 offset;
733 	size_t remain;
734 	char *readbuf;
735 	const struct firmware *fw;
736 
737 	struct reg_sequence seq_setup[] = {
738 		REG_SEQ0(0x805e, 0xdf),
739 		REG_SEQ0(0x8058, 0x00),
740 		REG_SEQ0(0x8059, 0x50),
741 		REG_SEQ0(0x805a, 0x10),
742 		REG_SEQ0(0x805a, 0x00),
743 	};
744 
745 
746 	struct reg_sequence seq_block_erase[] = {
747 		REG_SEQ0(0x805a, 0x04),
748 		REG_SEQ0(0x805a, 0x00),
749 		REG_SEQ0(0x805b, 0x00),
750 		REG_SEQ0(0x805c, 0x00),
751 		REG_SEQ0(0x805d, 0x00),
752 		REG_SEQ0(0x805a, 0x01),
753 		REG_SEQ0(0x805a, 0x00),
754 	};
755 
756 	ret = request_firmware(&fw, "lt9611uxc_fw.bin", lt9611uxc->dev);
757 	if (ret < 0)
758 		return ret;
759 
760 	dev_info(lt9611uxc->dev, "Updating firmware\n");
761 	lt9611uxc_lock(lt9611uxc);
762 
763 	regmap_multi_reg_write(lt9611uxc->regmap, seq_setup, ARRAY_SIZE(seq_setup));
764 
765 	/*
766 	 * Need erase block 2 timess here. Sometimes, block erase can fail.
767 	 * This is a workaroud.
768 	 */
769 	regmap_multi_reg_write(lt9611uxc->regmap, seq_block_erase, ARRAY_SIZE(seq_block_erase));
770 	msleep(3000);
771 	regmap_multi_reg_write(lt9611uxc->regmap, seq_block_erase, ARRAY_SIZE(seq_block_erase));
772 	msleep(3000);
773 
774 	for (offset = 0, remain = fw->size;
775 	     remain >= LT9611UXC_FW_PAGE_SIZE;
776 	     offset += LT9611UXC_FW_PAGE_SIZE, remain -= LT9611UXC_FW_PAGE_SIZE)
777 		lt9611uxc_firmware_write_page(lt9611uxc, offset, fw->data + offset);
778 
779 	if (remain > 0) {
780 		char buf[LT9611UXC_FW_PAGE_SIZE];
781 
782 		memset(buf, 0xff, LT9611UXC_FW_PAGE_SIZE);
783 		memcpy(buf, fw->data + offset, remain);
784 		lt9611uxc_firmware_write_page(lt9611uxc, offset, buf);
785 	}
786 	msleep(20);
787 
788 	readbuf = lt9611uxc_firmware_read(lt9611uxc, fw->size);
789 	if (!readbuf) {
790 		ret = -ENOMEM;
791 		goto out;
792 	}
793 
794 	if (!memcmp(readbuf, fw->data, fw->size)) {
795 		dev_err(lt9611uxc->dev, "Firmware update failed\n");
796 		print_hex_dump(KERN_ERR, "fw: ", DUMP_PREFIX_OFFSET, 16, 1, readbuf, fw->size, false);
797 		ret = -EINVAL;
798 	} else {
799 		dev_info(lt9611uxc->dev, "Firmware updates successfully\n");
800 		ret = 0;
801 	}
802 	kfree(readbuf);
803 
804 out:
805 	lt9611uxc_unlock(lt9611uxc);
806 	lt9611uxc_reset(lt9611uxc);
807 	release_firmware(fw);
808 
809 	return ret;
810 }
811 
812 static ssize_t lt9611uxc_firmware_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t len)
813 {
814 	struct lt9611uxc *lt9611uxc = dev_get_drvdata(dev);
815 	int ret;
816 
817 	ret = lt9611uxc_firmware_update(lt9611uxc);
818 	if (ret < 0)
819 		return ret;
820 	return len;
821 }
822 
823 static ssize_t lt9611uxc_firmware_show(struct device *dev, struct device_attribute *attr, char *buf)
824 {
825 	struct lt9611uxc *lt9611uxc = dev_get_drvdata(dev);
826 
827 	return sysfs_emit(buf, "%02x\n", lt9611uxc->fw_version);
828 }
829 
830 static DEVICE_ATTR_RW(lt9611uxc_firmware);
831 
832 static struct attribute *lt9611uxc_attrs[] = {
833 	&dev_attr_lt9611uxc_firmware.attr,
834 	NULL,
835 };
836 
837 static const struct attribute_group lt9611uxc_attr_group = {
838 	.attrs = lt9611uxc_attrs,
839 };
840 
841 static const struct attribute_group *lt9611uxc_attr_groups[] = {
842 	&lt9611uxc_attr_group,
843 	NULL,
844 };
845 
846 static int lt9611uxc_probe(struct i2c_client *client,
847 			   const struct i2c_device_id *id)
848 {
849 	struct lt9611uxc *lt9611uxc;
850 	struct device *dev = &client->dev;
851 	int ret;
852 	bool fw_updated = false;
853 
854 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
855 		dev_err(dev, "device doesn't support I2C\n");
856 		return -ENODEV;
857 	}
858 
859 	lt9611uxc = devm_kzalloc(dev, sizeof(*lt9611uxc), GFP_KERNEL);
860 	if (!lt9611uxc)
861 		return -ENOMEM;
862 
863 	lt9611uxc->dev = &client->dev;
864 	lt9611uxc->client = client;
865 	mutex_init(&lt9611uxc->ocm_lock);
866 
867 	lt9611uxc->regmap = devm_regmap_init_i2c(client, &lt9611uxc_regmap_config);
868 	if (IS_ERR(lt9611uxc->regmap)) {
869 		dev_err(lt9611uxc->dev, "regmap i2c init failed\n");
870 		return PTR_ERR(lt9611uxc->regmap);
871 	}
872 
873 	ret = lt9611uxc_parse_dt(&client->dev, lt9611uxc);
874 	if (ret) {
875 		dev_err(dev, "failed to parse device tree\n");
876 		return ret;
877 	}
878 
879 	ret = lt9611uxc_gpio_init(lt9611uxc);
880 	if (ret < 0)
881 		goto err_of_put;
882 
883 	ret = lt9611uxc_regulator_init(lt9611uxc);
884 	if (ret < 0)
885 		goto err_of_put;
886 
887 	lt9611uxc_assert_5v(lt9611uxc);
888 
889 	ret = lt9611uxc_regulator_enable(lt9611uxc);
890 	if (ret)
891 		goto err_of_put;
892 
893 	lt9611uxc_reset(lt9611uxc);
894 
895 	ret = lt9611uxc_read_device_rev(lt9611uxc);
896 	if (ret) {
897 		dev_err(dev, "failed to read chip rev\n");
898 		goto err_disable_regulators;
899 	}
900 
901 retry:
902 	ret = lt9611uxc_read_version(lt9611uxc);
903 	if (ret < 0) {
904 		dev_err(dev, "failed to read FW version\n");
905 		goto err_disable_regulators;
906 	} else if (ret == 0) {
907 		if (!fw_updated) {
908 			fw_updated = true;
909 			dev_err(dev, "FW version 0, enforcing firmware update\n");
910 			ret = lt9611uxc_firmware_update(lt9611uxc);
911 			if (ret < 0)
912 				goto err_disable_regulators;
913 			else
914 				goto retry;
915 		} else {
916 			dev_err(dev, "FW version 0, update failed\n");
917 			ret = -EOPNOTSUPP;
918 			goto err_disable_regulators;
919 		}
920 	} else if (ret < 0x40) {
921 		dev_info(dev, "FW version 0x%x, HPD not supported\n", ret);
922 	} else {
923 		lt9611uxc->hpd_supported = true;
924 	}
925 	lt9611uxc->fw_version = ret;
926 
927 	init_waitqueue_head(&lt9611uxc->wq);
928 	INIT_WORK(&lt9611uxc->work, lt9611uxc_hpd_work);
929 
930 	ret = devm_request_threaded_irq(dev, client->irq, NULL,
931 					lt9611uxc_irq_thread_handler,
932 					IRQF_ONESHOT, "lt9611uxc", lt9611uxc);
933 	if (ret) {
934 		dev_err(dev, "failed to request irq\n");
935 		goto err_disable_regulators;
936 	}
937 
938 	i2c_set_clientdata(client, lt9611uxc);
939 
940 	lt9611uxc->bridge.funcs = &lt9611uxc_bridge_funcs;
941 	lt9611uxc->bridge.of_node = client->dev.of_node;
942 	lt9611uxc->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID;
943 	if (lt9611uxc->hpd_supported)
944 		lt9611uxc->bridge.ops |= DRM_BRIDGE_OP_HPD;
945 	lt9611uxc->bridge.type = DRM_MODE_CONNECTOR_HDMIA;
946 
947 	drm_bridge_add(&lt9611uxc->bridge);
948 
949 	/* Attach primary DSI */
950 	lt9611uxc->dsi0 = lt9611uxc_attach_dsi(lt9611uxc, lt9611uxc->dsi0_node);
951 	if (IS_ERR(lt9611uxc->dsi0)) {
952 		ret = PTR_ERR(lt9611uxc->dsi0);
953 		goto err_remove_bridge;
954 	}
955 
956 	/* Attach secondary DSI, if specified */
957 	if (lt9611uxc->dsi1_node) {
958 		lt9611uxc->dsi1 = lt9611uxc_attach_dsi(lt9611uxc, lt9611uxc->dsi1_node);
959 		if (IS_ERR(lt9611uxc->dsi1)) {
960 			ret = PTR_ERR(lt9611uxc->dsi1);
961 			goto err_remove_bridge;
962 		}
963 	}
964 
965 	return lt9611uxc_audio_init(dev, lt9611uxc);
966 
967 err_remove_bridge:
968 	drm_bridge_remove(&lt9611uxc->bridge);
969 
970 err_disable_regulators:
971 	regulator_bulk_disable(ARRAY_SIZE(lt9611uxc->supplies), lt9611uxc->supplies);
972 
973 err_of_put:
974 	of_node_put(lt9611uxc->dsi1_node);
975 	of_node_put(lt9611uxc->dsi0_node);
976 
977 	return ret;
978 }
979 
980 static int lt9611uxc_remove(struct i2c_client *client)
981 {
982 	struct lt9611uxc *lt9611uxc = i2c_get_clientdata(client);
983 
984 	disable_irq(client->irq);
985 	flush_scheduled_work();
986 	lt9611uxc_audio_exit(lt9611uxc);
987 	drm_bridge_remove(&lt9611uxc->bridge);
988 
989 	mutex_destroy(&lt9611uxc->ocm_lock);
990 
991 	regulator_bulk_disable(ARRAY_SIZE(lt9611uxc->supplies), lt9611uxc->supplies);
992 
993 	of_node_put(lt9611uxc->dsi1_node);
994 	of_node_put(lt9611uxc->dsi0_node);
995 
996 	return 0;
997 }
998 
999 static struct i2c_device_id lt9611uxc_id[] = {
1000 	{ "lontium,lt9611uxc", 0 },
1001 	{ /* sentinel */ }
1002 };
1003 
1004 static const struct of_device_id lt9611uxc_match_table[] = {
1005 	{ .compatible = "lontium,lt9611uxc" },
1006 	{ /* sentinel */ }
1007 };
1008 MODULE_DEVICE_TABLE(of, lt9611uxc_match_table);
1009 
1010 static struct i2c_driver lt9611uxc_driver = {
1011 	.driver = {
1012 		.name = "lt9611uxc",
1013 		.of_match_table = lt9611uxc_match_table,
1014 		.dev_groups = lt9611uxc_attr_groups,
1015 	},
1016 	.probe = lt9611uxc_probe,
1017 	.remove = lt9611uxc_remove,
1018 	.id_table = lt9611uxc_id,
1019 };
1020 module_i2c_driver(lt9611uxc_driver);
1021 
1022 MODULE_AUTHOR("Dmitry Baryshkov <dmitry.baryshkov@linaro.org>");
1023 MODULE_LICENSE("GPL v2");
1024