xref: /linux/drivers/gpu/drm/bridge/lontium-lt9611uxc.c (revision 78964fcac47fc1525ecb4c37cd5fbc873c28320b)
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/i2c.h>
10 #include <linux/interrupt.h>
11 #include <linux/module.h>
12 #include <linux/mutex.h>
13 #include <linux/of_graph.h>
14 #include <linux/platform_device.h>
15 #include <linux/regmap.h>
16 #include <linux/regulator/consumer.h>
17 #include <linux/wait.h>
18 #include <linux/workqueue.h>
19 
20 #include <sound/hdmi-codec.h>
21 
22 #include <drm/drm_atomic_helper.h>
23 #include <drm/drm_bridge.h>
24 #include <drm/drm_mipi_dsi.h>
25 #include <drm/drm_print.h>
26 #include <drm/drm_probe_helper.h>
27 
28 #define EDID_BLOCK_SIZE	128
29 #define EDID_NUM_BLOCKS	2
30 
31 #define FW_FILE "lt9611uxc_fw.bin"
32 
33 struct lt9611uxc {
34 	struct device *dev;
35 	struct drm_bridge bridge;
36 	struct drm_connector connector;
37 
38 	struct regmap *regmap;
39 	/* Protects all accesses to registers by stopping the on-chip MCU */
40 	struct mutex ocm_lock;
41 
42 	struct wait_queue_head wq;
43 	struct work_struct work;
44 
45 	struct device_node *dsi0_node;
46 	struct device_node *dsi1_node;
47 	struct mipi_dsi_device *dsi0;
48 	struct mipi_dsi_device *dsi1;
49 	struct platform_device *audio_pdev;
50 
51 	struct gpio_desc *reset_gpio;
52 	struct gpio_desc *enable_gpio;
53 
54 	struct regulator_bulk_data supplies[2];
55 
56 	struct i2c_client *client;
57 
58 	bool hpd_supported;
59 	bool edid_read;
60 	/* can be accessed from different threads, so protect this with ocm_lock */
61 	bool hdmi_connected;
62 	uint8_t fw_version;
63 };
64 
65 #define LT9611_PAGE_CONTROL	0xff
66 
67 static const struct regmap_range_cfg lt9611uxc_ranges[] = {
68 	{
69 		.name = "register_range",
70 		.range_min =  0,
71 		.range_max = 0xd0ff,
72 		.selector_reg = LT9611_PAGE_CONTROL,
73 		.selector_mask = 0xff,
74 		.selector_shift = 0,
75 		.window_start = 0,
76 		.window_len = 0x100,
77 	},
78 };
79 
80 static const struct regmap_config lt9611uxc_regmap_config = {
81 	.reg_bits = 8,
82 	.val_bits = 8,
83 	.max_register = 0xffff,
84 	.ranges = lt9611uxc_ranges,
85 	.num_ranges = ARRAY_SIZE(lt9611uxc_ranges),
86 };
87 
88 struct lt9611uxc_mode {
89 	u16 hdisplay;
90 	u16 vdisplay;
91 	u8 vrefresh;
92 };
93 
94 /*
95  * This chip supports only a fixed set of modes.
96  * Enumerate them here to check whether the mode is supported.
97  */
98 static struct lt9611uxc_mode lt9611uxc_modes[] = {
99 	{ 1920, 1080, 60 },
100 	{ 1920, 1080, 30 },
101 	{ 1920, 1080, 25 },
102 	{ 1366, 768, 60 },
103 	{ 1360, 768, 60 },
104 	{ 1280, 1024, 60 },
105 	{ 1280, 800, 60 },
106 	{ 1280, 720, 60 },
107 	{ 1280, 720, 50 },
108 	{ 1280, 720, 30 },
109 	{ 1152, 864, 60 },
110 	{ 1024, 768, 60 },
111 	{ 800, 600, 60 },
112 	{ 720, 576, 50 },
113 	{ 720, 480, 60 },
114 	{ 640, 480, 60 },
115 };
116 
117 static struct lt9611uxc *bridge_to_lt9611uxc(struct drm_bridge *bridge)
118 {
119 	return container_of(bridge, struct lt9611uxc, bridge);
120 }
121 
122 static struct lt9611uxc *connector_to_lt9611uxc(struct drm_connector *connector)
123 {
124 	return container_of(connector, struct lt9611uxc, connector);
125 }
126 
127 static void lt9611uxc_lock(struct lt9611uxc *lt9611uxc)
128 {
129 	mutex_lock(&lt9611uxc->ocm_lock);
130 	regmap_write(lt9611uxc->regmap, 0x80ee, 0x01);
131 }
132 
133 static void lt9611uxc_unlock(struct lt9611uxc *lt9611uxc)
134 {
135 	regmap_write(lt9611uxc->regmap, 0x80ee, 0x00);
136 	msleep(50);
137 	mutex_unlock(&lt9611uxc->ocm_lock);
138 }
139 
140 static irqreturn_t lt9611uxc_irq_thread_handler(int irq, void *dev_id)
141 {
142 	struct lt9611uxc *lt9611uxc = dev_id;
143 	unsigned int irq_status = 0;
144 	unsigned int hpd_status = 0;
145 
146 	lt9611uxc_lock(lt9611uxc);
147 
148 	regmap_read(lt9611uxc->regmap, 0xb022, &irq_status);
149 	regmap_read(lt9611uxc->regmap, 0xb023, &hpd_status);
150 	if (irq_status)
151 		regmap_write(lt9611uxc->regmap, 0xb022, 0);
152 
153 	if (irq_status & BIT(0)) {
154 		lt9611uxc->edid_read = !!(hpd_status & BIT(0));
155 		wake_up_all(&lt9611uxc->wq);
156 	}
157 
158 	if (irq_status & BIT(1)) {
159 		lt9611uxc->hdmi_connected = hpd_status & BIT(1);
160 		schedule_work(&lt9611uxc->work);
161 	}
162 
163 	lt9611uxc_unlock(lt9611uxc);
164 
165 	return IRQ_HANDLED;
166 }
167 
168 static void lt9611uxc_hpd_work(struct work_struct *work)
169 {
170 	struct lt9611uxc *lt9611uxc = container_of(work, struct lt9611uxc, work);
171 	bool connected;
172 
173 	if (lt9611uxc->connector.dev) {
174 		if (lt9611uxc->connector.dev->mode_config.funcs)
175 			drm_kms_helper_hotplug_event(lt9611uxc->connector.dev);
176 	} else {
177 
178 		mutex_lock(&lt9611uxc->ocm_lock);
179 		connected = lt9611uxc->hdmi_connected;
180 		mutex_unlock(&lt9611uxc->ocm_lock);
181 
182 		drm_bridge_hpd_notify(&lt9611uxc->bridge,
183 				      connected ?
184 				      connector_status_connected :
185 				      connector_status_disconnected);
186 	}
187 }
188 
189 static void lt9611uxc_reset(struct lt9611uxc *lt9611uxc)
190 {
191 	gpiod_set_value_cansleep(lt9611uxc->reset_gpio, 1);
192 	msleep(20);
193 
194 	gpiod_set_value_cansleep(lt9611uxc->reset_gpio, 0);
195 	msleep(20);
196 
197 	gpiod_set_value_cansleep(lt9611uxc->reset_gpio, 1);
198 	msleep(300);
199 }
200 
201 static void lt9611uxc_assert_5v(struct lt9611uxc *lt9611uxc)
202 {
203 	if (!lt9611uxc->enable_gpio)
204 		return;
205 
206 	gpiod_set_value_cansleep(lt9611uxc->enable_gpio, 1);
207 	msleep(20);
208 }
209 
210 static int lt9611uxc_regulator_init(struct lt9611uxc *lt9611uxc)
211 {
212 	int ret;
213 
214 	lt9611uxc->supplies[0].supply = "vdd";
215 	lt9611uxc->supplies[1].supply = "vcc";
216 
217 	ret = devm_regulator_bulk_get(lt9611uxc->dev, 2, lt9611uxc->supplies);
218 	if (ret < 0)
219 		return ret;
220 
221 	return regulator_set_load(lt9611uxc->supplies[0].consumer, 200000);
222 }
223 
224 static int lt9611uxc_regulator_enable(struct lt9611uxc *lt9611uxc)
225 {
226 	int ret;
227 
228 	ret = regulator_enable(lt9611uxc->supplies[0].consumer);
229 	if (ret < 0)
230 		return ret;
231 
232 	usleep_range(1000, 10000); /* 50000 according to dtsi */
233 
234 	ret = regulator_enable(lt9611uxc->supplies[1].consumer);
235 	if (ret < 0) {
236 		regulator_disable(lt9611uxc->supplies[0].consumer);
237 		return ret;
238 	}
239 
240 	return 0;
241 }
242 
243 static struct lt9611uxc_mode *lt9611uxc_find_mode(const struct drm_display_mode *mode)
244 {
245 	int i;
246 
247 	for (i = 0; i < ARRAY_SIZE(lt9611uxc_modes); i++) {
248 		if (lt9611uxc_modes[i].hdisplay == mode->hdisplay &&
249 		    lt9611uxc_modes[i].vdisplay == mode->vdisplay &&
250 		    lt9611uxc_modes[i].vrefresh == drm_mode_vrefresh(mode)) {
251 			return &lt9611uxc_modes[i];
252 		}
253 	}
254 
255 	return NULL;
256 }
257 
258 static struct mipi_dsi_device *lt9611uxc_attach_dsi(struct lt9611uxc *lt9611uxc,
259 						    struct device_node *dsi_node)
260 {
261 	const struct mipi_dsi_device_info info = { "lt9611uxc", 0, NULL };
262 	struct mipi_dsi_device *dsi;
263 	struct mipi_dsi_host *host;
264 	struct device *dev = lt9611uxc->dev;
265 	int ret;
266 
267 	host = of_find_mipi_dsi_host_by_node(dsi_node);
268 	if (!host) {
269 		dev_err(dev, "failed to find dsi host\n");
270 		return ERR_PTR(-EPROBE_DEFER);
271 	}
272 
273 	dsi = devm_mipi_dsi_device_register_full(dev, host, &info);
274 	if (IS_ERR(dsi)) {
275 		dev_err(dev, "failed to create dsi device\n");
276 		return dsi;
277 	}
278 
279 	dsi->lanes = 4;
280 	dsi->format = MIPI_DSI_FMT_RGB888;
281 	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_SYNC_PULSE |
282 			  MIPI_DSI_MODE_VIDEO_HSE;
283 
284 	ret = devm_mipi_dsi_attach(dev, dsi);
285 	if (ret < 0) {
286 		dev_err(dev, "failed to attach dsi to host\n");
287 		return ERR_PTR(ret);
288 	}
289 
290 	return dsi;
291 }
292 
293 static int lt9611uxc_connector_get_modes(struct drm_connector *connector)
294 {
295 	struct lt9611uxc *lt9611uxc = connector_to_lt9611uxc(connector);
296 	unsigned int count;
297 	struct edid *edid;
298 
299 	edid = drm_bridge_get_edid(&lt9611uxc->bridge, connector);
300 	drm_connector_update_edid_property(connector, edid);
301 	count = drm_add_edid_modes(connector, edid);
302 	kfree(edid);
303 
304 	return count;
305 }
306 
307 static enum drm_connector_status lt9611uxc_connector_detect(struct drm_connector *connector,
308 							    bool force)
309 {
310 	struct lt9611uxc *lt9611uxc = connector_to_lt9611uxc(connector);
311 
312 	return lt9611uxc->bridge.funcs->detect(&lt9611uxc->bridge);
313 }
314 
315 static enum drm_mode_status lt9611uxc_connector_mode_valid(struct drm_connector *connector,
316 							   struct drm_display_mode *mode)
317 {
318 	struct lt9611uxc_mode *lt9611uxc_mode = lt9611uxc_find_mode(mode);
319 
320 	return lt9611uxc_mode ? MODE_OK : MODE_BAD;
321 }
322 
323 static const struct drm_connector_helper_funcs lt9611uxc_bridge_connector_helper_funcs = {
324 	.get_modes = lt9611uxc_connector_get_modes,
325 	.mode_valid = lt9611uxc_connector_mode_valid,
326 };
327 
328 static const struct drm_connector_funcs lt9611uxc_bridge_connector_funcs = {
329 	.fill_modes = drm_helper_probe_single_connector_modes,
330 	.detect = lt9611uxc_connector_detect,
331 	.destroy = drm_connector_cleanup,
332 	.reset = drm_atomic_helper_connector_reset,
333 	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
334 	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
335 };
336 
337 static int lt9611uxc_connector_init(struct drm_bridge *bridge, struct lt9611uxc *lt9611uxc)
338 {
339 	int ret;
340 
341 	if (!bridge->encoder) {
342 		DRM_ERROR("Parent encoder object not found");
343 		return -ENODEV;
344 	}
345 
346 	lt9611uxc->connector.polled = DRM_CONNECTOR_POLL_HPD;
347 
348 	drm_connector_helper_add(&lt9611uxc->connector,
349 				 &lt9611uxc_bridge_connector_helper_funcs);
350 	ret = drm_connector_init(bridge->dev, &lt9611uxc->connector,
351 				 &lt9611uxc_bridge_connector_funcs,
352 				 DRM_MODE_CONNECTOR_HDMIA);
353 	if (ret) {
354 		DRM_ERROR("Failed to initialize connector with drm\n");
355 		return ret;
356 	}
357 
358 	return drm_connector_attach_encoder(&lt9611uxc->connector, bridge->encoder);
359 }
360 
361 static int lt9611uxc_bridge_attach(struct drm_bridge *bridge,
362 				   enum drm_bridge_attach_flags flags)
363 {
364 	struct lt9611uxc *lt9611uxc = bridge_to_lt9611uxc(bridge);
365 	int ret;
366 
367 	if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
368 		ret = lt9611uxc_connector_init(bridge, lt9611uxc);
369 		if (ret < 0)
370 			return ret;
371 	}
372 
373 	return 0;
374 }
375 
376 static enum drm_mode_status
377 lt9611uxc_bridge_mode_valid(struct drm_bridge *bridge,
378 			    const struct drm_display_info *info,
379 			    const struct drm_display_mode *mode)
380 {
381 	struct lt9611uxc_mode *lt9611uxc_mode;
382 
383 	lt9611uxc_mode = lt9611uxc_find_mode(mode);
384 
385 	return lt9611uxc_mode ? MODE_OK : MODE_BAD;
386 }
387 
388 static void lt9611uxc_video_setup(struct lt9611uxc *lt9611uxc,
389 				  const struct drm_display_mode *mode)
390 {
391 	u32 h_total, hactive, hsync_len, hfront_porch;
392 	u32 v_total, vactive, vsync_len, vfront_porch;
393 
394 	h_total = mode->htotal;
395 	v_total = mode->vtotal;
396 
397 	hactive = mode->hdisplay;
398 	hsync_len = mode->hsync_end - mode->hsync_start;
399 	hfront_porch = mode->hsync_start - mode->hdisplay;
400 
401 	vactive = mode->vdisplay;
402 	vsync_len = mode->vsync_end - mode->vsync_start;
403 	vfront_porch = mode->vsync_start - mode->vdisplay;
404 
405 	regmap_write(lt9611uxc->regmap, 0xd00d, (u8)(v_total / 256));
406 	regmap_write(lt9611uxc->regmap, 0xd00e, (u8)(v_total % 256));
407 
408 	regmap_write(lt9611uxc->regmap, 0xd00f, (u8)(vactive / 256));
409 	regmap_write(lt9611uxc->regmap, 0xd010, (u8)(vactive % 256));
410 
411 	regmap_write(lt9611uxc->regmap, 0xd011, (u8)(h_total / 256));
412 	regmap_write(lt9611uxc->regmap, 0xd012, (u8)(h_total % 256));
413 
414 	regmap_write(lt9611uxc->regmap, 0xd013, (u8)(hactive / 256));
415 	regmap_write(lt9611uxc->regmap, 0xd014, (u8)(hactive % 256));
416 
417 	regmap_write(lt9611uxc->regmap, 0xd015, (u8)(vsync_len % 256));
418 
419 	regmap_update_bits(lt9611uxc->regmap, 0xd016, 0xf, (u8)(hsync_len / 256));
420 	regmap_write(lt9611uxc->regmap, 0xd017, (u8)(hsync_len % 256));
421 
422 	regmap_update_bits(lt9611uxc->regmap, 0xd018, 0xf, (u8)(vfront_porch / 256));
423 	regmap_write(lt9611uxc->regmap, 0xd019, (u8)(vfront_porch % 256));
424 
425 	regmap_update_bits(lt9611uxc->regmap, 0xd01a, 0xf, (u8)(hfront_porch / 256));
426 	regmap_write(lt9611uxc->regmap, 0xd01b, (u8)(hfront_porch % 256));
427 }
428 
429 static void lt9611uxc_bridge_mode_set(struct drm_bridge *bridge,
430 				      const struct drm_display_mode *mode,
431 				      const struct drm_display_mode *adj_mode)
432 {
433 	struct lt9611uxc *lt9611uxc = bridge_to_lt9611uxc(bridge);
434 
435 	lt9611uxc_lock(lt9611uxc);
436 	lt9611uxc_video_setup(lt9611uxc, mode);
437 	lt9611uxc_unlock(lt9611uxc);
438 }
439 
440 static enum drm_connector_status lt9611uxc_bridge_detect(struct drm_bridge *bridge)
441 {
442 	struct lt9611uxc *lt9611uxc = bridge_to_lt9611uxc(bridge);
443 	unsigned int reg_val = 0;
444 	int ret;
445 	bool connected = true;
446 
447 	lt9611uxc_lock(lt9611uxc);
448 
449 	if (lt9611uxc->hpd_supported) {
450 		ret = regmap_read(lt9611uxc->regmap, 0xb023, &reg_val);
451 
452 		if (ret)
453 			dev_err(lt9611uxc->dev, "failed to read hpd status: %d\n", ret);
454 		else
455 			connected  = reg_val & BIT(1);
456 	}
457 	lt9611uxc->hdmi_connected = connected;
458 
459 	lt9611uxc_unlock(lt9611uxc);
460 
461 	return connected ?  connector_status_connected :
462 				connector_status_disconnected;
463 }
464 
465 static int lt9611uxc_wait_for_edid(struct lt9611uxc *lt9611uxc)
466 {
467 	return wait_event_interruptible_timeout(lt9611uxc->wq, lt9611uxc->edid_read,
468 			msecs_to_jiffies(500));
469 }
470 
471 static int lt9611uxc_get_edid_block(void *data, u8 *buf, unsigned int block, size_t len)
472 {
473 	struct lt9611uxc *lt9611uxc = data;
474 	int ret;
475 
476 	if (len > EDID_BLOCK_SIZE)
477 		return -EINVAL;
478 
479 	if (block >= EDID_NUM_BLOCKS)
480 		return -EINVAL;
481 
482 	lt9611uxc_lock(lt9611uxc);
483 
484 	regmap_write(lt9611uxc->regmap, 0xb00b, 0x10);
485 
486 	regmap_write(lt9611uxc->regmap, 0xb00a, block * EDID_BLOCK_SIZE);
487 
488 	ret = regmap_noinc_read(lt9611uxc->regmap, 0xb0b0, buf, len);
489 	if (ret)
490 		dev_err(lt9611uxc->dev, "edid read failed: %d\n", ret);
491 
492 	lt9611uxc_unlock(lt9611uxc);
493 
494 	return 0;
495 };
496 
497 static struct edid *lt9611uxc_bridge_get_edid(struct drm_bridge *bridge,
498 					      struct drm_connector *connector)
499 {
500 	struct lt9611uxc *lt9611uxc = bridge_to_lt9611uxc(bridge);
501 	int ret;
502 
503 	ret = lt9611uxc_wait_for_edid(lt9611uxc);
504 	if (ret < 0) {
505 		dev_err(lt9611uxc->dev, "wait for EDID failed: %d\n", ret);
506 		return NULL;
507 	} else if (ret == 0) {
508 		dev_err(lt9611uxc->dev, "wait for EDID timeout\n");
509 		return NULL;
510 	}
511 
512 	return drm_do_get_edid(connector, lt9611uxc_get_edid_block, lt9611uxc);
513 }
514 
515 static const struct drm_bridge_funcs lt9611uxc_bridge_funcs = {
516 	.attach = lt9611uxc_bridge_attach,
517 	.mode_valid = lt9611uxc_bridge_mode_valid,
518 	.mode_set = lt9611uxc_bridge_mode_set,
519 	.detect = lt9611uxc_bridge_detect,
520 	.get_edid = lt9611uxc_bridge_get_edid,
521 };
522 
523 static int lt9611uxc_parse_dt(struct device *dev,
524 			      struct lt9611uxc *lt9611uxc)
525 {
526 	lt9611uxc->dsi0_node = of_graph_get_remote_node(dev->of_node, 0, -1);
527 	if (!lt9611uxc->dsi0_node) {
528 		dev_err(lt9611uxc->dev, "failed to get remote node for primary dsi\n");
529 		return -ENODEV;
530 	}
531 
532 	lt9611uxc->dsi1_node = of_graph_get_remote_node(dev->of_node, 1, -1);
533 
534 	return 0;
535 }
536 
537 static int lt9611uxc_gpio_init(struct lt9611uxc *lt9611uxc)
538 {
539 	struct device *dev = lt9611uxc->dev;
540 
541 	lt9611uxc->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
542 	if (IS_ERR(lt9611uxc->reset_gpio)) {
543 		dev_err(dev, "failed to acquire reset gpio\n");
544 		return PTR_ERR(lt9611uxc->reset_gpio);
545 	}
546 
547 	lt9611uxc->enable_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_LOW);
548 	if (IS_ERR(lt9611uxc->enable_gpio)) {
549 		dev_err(dev, "failed to acquire enable gpio\n");
550 		return PTR_ERR(lt9611uxc->enable_gpio);
551 	}
552 
553 	return 0;
554 }
555 
556 static int lt9611uxc_read_device_rev(struct lt9611uxc *lt9611uxc)
557 {
558 	unsigned int rev0, rev1, rev2;
559 	int ret;
560 
561 	lt9611uxc_lock(lt9611uxc);
562 
563 	ret = regmap_read(lt9611uxc->regmap, 0x8100, &rev0);
564 	ret |= regmap_read(lt9611uxc->regmap, 0x8101, &rev1);
565 	ret |= regmap_read(lt9611uxc->regmap, 0x8102, &rev2);
566 	if (ret)
567 		dev_err(lt9611uxc->dev, "failed to read revision: %d\n", ret);
568 	else
569 		dev_info(lt9611uxc->dev, "LT9611 revision: 0x%02x.%02x.%02x\n", rev0, rev1, rev2);
570 
571 	lt9611uxc_unlock(lt9611uxc);
572 
573 	return ret;
574 }
575 
576 static int lt9611uxc_read_version(struct lt9611uxc *lt9611uxc)
577 {
578 	unsigned int rev;
579 	int ret;
580 
581 	lt9611uxc_lock(lt9611uxc);
582 
583 	ret = regmap_read(lt9611uxc->regmap, 0xb021, &rev);
584 	if (ret)
585 		dev_err(lt9611uxc->dev, "failed to read revision: %d\n", ret);
586 	else
587 		dev_info(lt9611uxc->dev, "LT9611 version: 0x%02x\n", rev);
588 
589 	lt9611uxc_unlock(lt9611uxc);
590 
591 	return ret < 0 ? ret : rev;
592 }
593 
594 static int lt9611uxc_hdmi_hw_params(struct device *dev, void *data,
595 				    struct hdmi_codec_daifmt *fmt,
596 				    struct hdmi_codec_params *hparms)
597 {
598 	/*
599 	 * LT9611UXC will automatically detect rate and sample size, so no need
600 	 * to setup anything here.
601 	 */
602 	return 0;
603 }
604 
605 static void lt9611uxc_audio_shutdown(struct device *dev, void *data)
606 {
607 }
608 
609 static int lt9611uxc_hdmi_i2s_get_dai_id(struct snd_soc_component *component,
610 					 struct device_node *endpoint)
611 {
612 	struct of_endpoint of_ep;
613 	int ret;
614 
615 	ret = of_graph_parse_endpoint(endpoint, &of_ep);
616 	if (ret < 0)
617 		return ret;
618 
619 	/*
620 	 * HDMI sound should be located as reg = <2>
621 	 * Then, it is sound port 0
622 	 */
623 	if (of_ep.port == 2)
624 		return 0;
625 
626 	return -EINVAL;
627 }
628 
629 static const struct hdmi_codec_ops lt9611uxc_codec_ops = {
630 	.hw_params	= lt9611uxc_hdmi_hw_params,
631 	.audio_shutdown = lt9611uxc_audio_shutdown,
632 	.get_dai_id	= lt9611uxc_hdmi_i2s_get_dai_id,
633 };
634 
635 static int lt9611uxc_audio_init(struct device *dev, struct lt9611uxc *lt9611uxc)
636 {
637 	struct hdmi_codec_pdata codec_data = {
638 		.ops = &lt9611uxc_codec_ops,
639 		.max_i2s_channels = 2,
640 		.i2s = 1,
641 		.data = lt9611uxc,
642 	};
643 
644 	lt9611uxc->audio_pdev =
645 		platform_device_register_data(dev, HDMI_CODEC_DRV_NAME,
646 					      PLATFORM_DEVID_AUTO,
647 					      &codec_data, sizeof(codec_data));
648 
649 	return PTR_ERR_OR_ZERO(lt9611uxc->audio_pdev);
650 }
651 
652 static void lt9611uxc_audio_exit(struct lt9611uxc *lt9611uxc)
653 {
654 	if (lt9611uxc->audio_pdev) {
655 		platform_device_unregister(lt9611uxc->audio_pdev);
656 		lt9611uxc->audio_pdev = NULL;
657 	}
658 }
659 
660 #define LT9611UXC_FW_PAGE_SIZE 32
661 static void lt9611uxc_firmware_write_page(struct lt9611uxc *lt9611uxc, u16 addr, const u8 *buf)
662 {
663 	struct reg_sequence seq_write_prepare[] = {
664 		REG_SEQ0(0x805a, 0x04),
665 		REG_SEQ0(0x805a, 0x00),
666 
667 		REG_SEQ0(0x805e, 0xdf),
668 		REG_SEQ0(0x805a, 0x20),
669 		REG_SEQ0(0x805a, 0x00),
670 		REG_SEQ0(0x8058, 0x21),
671 	};
672 
673 	struct reg_sequence seq_write_addr[] = {
674 		REG_SEQ0(0x805b, (addr >> 16) & 0xff),
675 		REG_SEQ0(0x805c, (addr >> 8) & 0xff),
676 		REG_SEQ0(0x805d, addr & 0xff),
677 		REG_SEQ0(0x805a, 0x10),
678 		REG_SEQ0(0x805a, 0x00),
679 	};
680 
681 	regmap_write(lt9611uxc->regmap, 0x8108, 0xbf);
682 	msleep(20);
683 	regmap_write(lt9611uxc->regmap, 0x8108, 0xff);
684 	msleep(20);
685 	regmap_multi_reg_write(lt9611uxc->regmap, seq_write_prepare, ARRAY_SIZE(seq_write_prepare));
686 	regmap_noinc_write(lt9611uxc->regmap, 0x8059, buf, LT9611UXC_FW_PAGE_SIZE);
687 	regmap_multi_reg_write(lt9611uxc->regmap, seq_write_addr, ARRAY_SIZE(seq_write_addr));
688 	msleep(20);
689 }
690 
691 static void lt9611uxc_firmware_read_page(struct lt9611uxc *lt9611uxc, u16 addr, char *buf)
692 {
693 	struct reg_sequence seq_read_page[] = {
694 		REG_SEQ0(0x805a, 0xa0),
695 		REG_SEQ0(0x805a, 0x80),
696 		REG_SEQ0(0x805b, (addr >> 16) & 0xff),
697 		REG_SEQ0(0x805c, (addr >> 8) & 0xff),
698 		REG_SEQ0(0x805d, addr & 0xff),
699 		REG_SEQ0(0x805a, 0x90),
700 		REG_SEQ0(0x805a, 0x80),
701 		REG_SEQ0(0x8058, 0x21),
702 	};
703 
704 	regmap_multi_reg_write(lt9611uxc->regmap, seq_read_page, ARRAY_SIZE(seq_read_page));
705 	regmap_noinc_read(lt9611uxc->regmap, 0x805f, buf, LT9611UXC_FW_PAGE_SIZE);
706 }
707 
708 static char *lt9611uxc_firmware_read(struct lt9611uxc *lt9611uxc, size_t size)
709 {
710 	struct reg_sequence seq_read_setup[] = {
711 		REG_SEQ0(0x805a, 0x84),
712 		REG_SEQ0(0x805a, 0x80),
713 	};
714 
715 	char *readbuf;
716 	u16 offset;
717 
718 	readbuf = kzalloc(ALIGN(size, 32), GFP_KERNEL);
719 	if (!readbuf)
720 		return NULL;
721 
722 	regmap_multi_reg_write(lt9611uxc->regmap, seq_read_setup, ARRAY_SIZE(seq_read_setup));
723 
724 	for (offset = 0;
725 	     offset < size;
726 	     offset += LT9611UXC_FW_PAGE_SIZE)
727 		lt9611uxc_firmware_read_page(lt9611uxc, offset, &readbuf[offset]);
728 
729 	return readbuf;
730 }
731 
732 static int lt9611uxc_firmware_update(struct lt9611uxc *lt9611uxc)
733 {
734 	int ret;
735 	u16 offset;
736 	size_t remain;
737 	char *readbuf;
738 	const struct firmware *fw;
739 
740 	struct reg_sequence seq_setup[] = {
741 		REG_SEQ0(0x805e, 0xdf),
742 		REG_SEQ0(0x8058, 0x00),
743 		REG_SEQ0(0x8059, 0x50),
744 		REG_SEQ0(0x805a, 0x10),
745 		REG_SEQ0(0x805a, 0x00),
746 	};
747 
748 
749 	struct reg_sequence seq_block_erase[] = {
750 		REG_SEQ0(0x805a, 0x04),
751 		REG_SEQ0(0x805a, 0x00),
752 		REG_SEQ0(0x805b, 0x00),
753 		REG_SEQ0(0x805c, 0x00),
754 		REG_SEQ0(0x805d, 0x00),
755 		REG_SEQ0(0x805a, 0x01),
756 		REG_SEQ0(0x805a, 0x00),
757 	};
758 
759 	ret = request_firmware(&fw, FW_FILE, lt9611uxc->dev);
760 	if (ret < 0)
761 		return ret;
762 
763 	dev_info(lt9611uxc->dev, "Updating firmware\n");
764 	lt9611uxc_lock(lt9611uxc);
765 
766 	regmap_multi_reg_write(lt9611uxc->regmap, seq_setup, ARRAY_SIZE(seq_setup));
767 
768 	/*
769 	 * Need erase block 2 timess here. Sometimes, block erase can fail.
770 	 * This is a workaroud.
771 	 */
772 	regmap_multi_reg_write(lt9611uxc->regmap, seq_block_erase, ARRAY_SIZE(seq_block_erase));
773 	msleep(3000);
774 	regmap_multi_reg_write(lt9611uxc->regmap, seq_block_erase, ARRAY_SIZE(seq_block_erase));
775 	msleep(3000);
776 
777 	for (offset = 0, remain = fw->size;
778 	     remain >= LT9611UXC_FW_PAGE_SIZE;
779 	     offset += LT9611UXC_FW_PAGE_SIZE, remain -= LT9611UXC_FW_PAGE_SIZE)
780 		lt9611uxc_firmware_write_page(lt9611uxc, offset, fw->data + offset);
781 
782 	if (remain > 0) {
783 		char buf[LT9611UXC_FW_PAGE_SIZE];
784 
785 		memset(buf, 0xff, LT9611UXC_FW_PAGE_SIZE);
786 		memcpy(buf, fw->data + offset, remain);
787 		lt9611uxc_firmware_write_page(lt9611uxc, offset, buf);
788 	}
789 	msleep(20);
790 
791 	readbuf = lt9611uxc_firmware_read(lt9611uxc, fw->size);
792 	if (!readbuf) {
793 		ret = -ENOMEM;
794 		goto out;
795 	}
796 
797 	if (!memcmp(readbuf, fw->data, fw->size)) {
798 		dev_err(lt9611uxc->dev, "Firmware update failed\n");
799 		print_hex_dump(KERN_ERR, "fw: ", DUMP_PREFIX_OFFSET, 16, 1, readbuf, fw->size, false);
800 		ret = -EINVAL;
801 	} else {
802 		dev_info(lt9611uxc->dev, "Firmware updates successfully\n");
803 		ret = 0;
804 	}
805 	kfree(readbuf);
806 
807 out:
808 	lt9611uxc_unlock(lt9611uxc);
809 	lt9611uxc_reset(lt9611uxc);
810 	release_firmware(fw);
811 
812 	return ret;
813 }
814 
815 static ssize_t lt9611uxc_firmware_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t len)
816 {
817 	struct lt9611uxc *lt9611uxc = dev_get_drvdata(dev);
818 	int ret;
819 
820 	ret = lt9611uxc_firmware_update(lt9611uxc);
821 	if (ret < 0)
822 		return ret;
823 	return len;
824 }
825 
826 static ssize_t lt9611uxc_firmware_show(struct device *dev, struct device_attribute *attr, char *buf)
827 {
828 	struct lt9611uxc *lt9611uxc = dev_get_drvdata(dev);
829 
830 	return sysfs_emit(buf, "%02x\n", lt9611uxc->fw_version);
831 }
832 
833 static DEVICE_ATTR_RW(lt9611uxc_firmware);
834 
835 static struct attribute *lt9611uxc_attrs[] = {
836 	&dev_attr_lt9611uxc_firmware.attr,
837 	NULL,
838 };
839 
840 static const struct attribute_group lt9611uxc_attr_group = {
841 	.attrs = lt9611uxc_attrs,
842 };
843 
844 static const struct attribute_group *lt9611uxc_attr_groups[] = {
845 	&lt9611uxc_attr_group,
846 	NULL,
847 };
848 
849 static int lt9611uxc_probe(struct i2c_client *client)
850 {
851 	struct lt9611uxc *lt9611uxc;
852 	struct device *dev = &client->dev;
853 	int ret;
854 	bool fw_updated = false;
855 
856 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
857 		dev_err(dev, "device doesn't support I2C\n");
858 		return -ENODEV;
859 	}
860 
861 	lt9611uxc = devm_kzalloc(dev, sizeof(*lt9611uxc), GFP_KERNEL);
862 	if (!lt9611uxc)
863 		return -ENOMEM;
864 
865 	lt9611uxc->dev = dev;
866 	lt9611uxc->client = client;
867 	mutex_init(&lt9611uxc->ocm_lock);
868 
869 	lt9611uxc->regmap = devm_regmap_init_i2c(client, &lt9611uxc_regmap_config);
870 	if (IS_ERR(lt9611uxc->regmap)) {
871 		dev_err(lt9611uxc->dev, "regmap i2c init failed\n");
872 		return PTR_ERR(lt9611uxc->regmap);
873 	}
874 
875 	ret = lt9611uxc_parse_dt(dev, lt9611uxc);
876 	if (ret) {
877 		dev_err(dev, "failed to parse device tree\n");
878 		return ret;
879 	}
880 
881 	ret = lt9611uxc_gpio_init(lt9611uxc);
882 	if (ret < 0)
883 		goto err_of_put;
884 
885 	ret = lt9611uxc_regulator_init(lt9611uxc);
886 	if (ret < 0)
887 		goto err_of_put;
888 
889 	lt9611uxc_assert_5v(lt9611uxc);
890 
891 	ret = lt9611uxc_regulator_enable(lt9611uxc);
892 	if (ret)
893 		goto err_of_put;
894 
895 	lt9611uxc_reset(lt9611uxc);
896 
897 	ret = lt9611uxc_read_device_rev(lt9611uxc);
898 	if (ret) {
899 		dev_err(dev, "failed to read chip rev\n");
900 		goto err_disable_regulators;
901 	}
902 
903 retry:
904 	ret = lt9611uxc_read_version(lt9611uxc);
905 	if (ret < 0) {
906 		dev_err(dev, "failed to read FW version\n");
907 		goto err_disable_regulators;
908 	} else if (ret == 0) {
909 		if (!fw_updated) {
910 			fw_updated = true;
911 			dev_err(dev, "FW version 0, enforcing firmware update\n");
912 			ret = lt9611uxc_firmware_update(lt9611uxc);
913 			if (ret < 0)
914 				goto err_disable_regulators;
915 			else
916 				goto retry;
917 		} else {
918 			dev_err(dev, "FW version 0, update failed\n");
919 			ret = -EOPNOTSUPP;
920 			goto err_disable_regulators;
921 		}
922 	} else if (ret < 0x40) {
923 		dev_info(dev, "FW version 0x%x, HPD not supported\n", ret);
924 	} else {
925 		lt9611uxc->hpd_supported = true;
926 	}
927 	lt9611uxc->fw_version = ret;
928 
929 	init_waitqueue_head(&lt9611uxc->wq);
930 	INIT_WORK(&lt9611uxc->work, lt9611uxc_hpd_work);
931 
932 	ret = devm_request_threaded_irq(dev, client->irq, NULL,
933 					lt9611uxc_irq_thread_handler,
934 					IRQF_ONESHOT, "lt9611uxc", lt9611uxc);
935 	if (ret) {
936 		dev_err(dev, "failed to request irq\n");
937 		goto err_disable_regulators;
938 	}
939 
940 	i2c_set_clientdata(client, lt9611uxc);
941 
942 	lt9611uxc->bridge.funcs = &lt9611uxc_bridge_funcs;
943 	lt9611uxc->bridge.of_node = client->dev.of_node;
944 	lt9611uxc->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID;
945 	if (lt9611uxc->hpd_supported)
946 		lt9611uxc->bridge.ops |= DRM_BRIDGE_OP_HPD;
947 	lt9611uxc->bridge.type = DRM_MODE_CONNECTOR_HDMIA;
948 
949 	drm_bridge_add(&lt9611uxc->bridge);
950 
951 	/* Attach primary DSI */
952 	lt9611uxc->dsi0 = lt9611uxc_attach_dsi(lt9611uxc, lt9611uxc->dsi0_node);
953 	if (IS_ERR(lt9611uxc->dsi0)) {
954 		ret = PTR_ERR(lt9611uxc->dsi0);
955 		goto err_remove_bridge;
956 	}
957 
958 	/* Attach secondary DSI, if specified */
959 	if (lt9611uxc->dsi1_node) {
960 		lt9611uxc->dsi1 = lt9611uxc_attach_dsi(lt9611uxc, lt9611uxc->dsi1_node);
961 		if (IS_ERR(lt9611uxc->dsi1)) {
962 			ret = PTR_ERR(lt9611uxc->dsi1);
963 			goto err_remove_bridge;
964 		}
965 	}
966 
967 	return lt9611uxc_audio_init(dev, lt9611uxc);
968 
969 err_remove_bridge:
970 	drm_bridge_remove(&lt9611uxc->bridge);
971 
972 err_disable_regulators:
973 	regulator_bulk_disable(ARRAY_SIZE(lt9611uxc->supplies), lt9611uxc->supplies);
974 
975 err_of_put:
976 	of_node_put(lt9611uxc->dsi1_node);
977 	of_node_put(lt9611uxc->dsi0_node);
978 
979 	return ret;
980 }
981 
982 static void lt9611uxc_remove(struct i2c_client *client)
983 {
984 	struct lt9611uxc *lt9611uxc = i2c_get_clientdata(client);
985 
986 	disable_irq(client->irq);
987 	cancel_work_sync(&lt9611uxc->work);
988 	lt9611uxc_audio_exit(lt9611uxc);
989 	drm_bridge_remove(&lt9611uxc->bridge);
990 
991 	mutex_destroy(&lt9611uxc->ocm_lock);
992 
993 	regulator_bulk_disable(ARRAY_SIZE(lt9611uxc->supplies), lt9611uxc->supplies);
994 
995 	of_node_put(lt9611uxc->dsi1_node);
996 	of_node_put(lt9611uxc->dsi0_node);
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 
1025 MODULE_FIRMWARE(FW_FILE);
1026