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 
bridge_to_lt9611uxc(struct drm_bridge * bridge)117 static struct lt9611uxc *bridge_to_lt9611uxc(struct drm_bridge *bridge)
118 {
119 	return container_of(bridge, struct lt9611uxc, bridge);
120 }
121 
connector_to_lt9611uxc(struct drm_connector * connector)122 static struct lt9611uxc *connector_to_lt9611uxc(struct drm_connector *connector)
123 {
124 	return container_of(connector, struct lt9611uxc, connector);
125 }
126 
lt9611uxc_lock(struct lt9611uxc * lt9611uxc)127 static void lt9611uxc_lock(struct lt9611uxc *lt9611uxc)
128 {
129 	mutex_lock(&lt9611uxc->ocm_lock);
130 	regmap_write(lt9611uxc->regmap, 0x80ee, 0x01);
131 }
132 
lt9611uxc_unlock(struct lt9611uxc * lt9611uxc)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 
lt9611uxc_irq_thread_handler(int irq,void * dev_id)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 
lt9611uxc_hpd_work(struct work_struct * work)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 
lt9611uxc_reset(struct lt9611uxc * lt9611uxc)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 
lt9611uxc_assert_5v(struct lt9611uxc * lt9611uxc)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 
lt9611uxc_regulator_init(struct lt9611uxc * lt9611uxc)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 
lt9611uxc_regulator_enable(struct lt9611uxc * lt9611uxc)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 
lt9611uxc_find_mode(const struct drm_display_mode * mode)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 
lt9611uxc_attach_dsi(struct lt9611uxc * lt9611uxc,struct device_node * dsi_node)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 		return ERR_PTR(dev_err_probe(dev, -EPROBE_DEFER, "failed to find dsi host\n"));
270 
271 	dsi = devm_mipi_dsi_device_register_full(dev, host, &info);
272 	if (IS_ERR(dsi)) {
273 		dev_err(dev, "failed to create dsi device\n");
274 		return dsi;
275 	}
276 
277 	dsi->lanes = 4;
278 	dsi->format = MIPI_DSI_FMT_RGB888;
279 	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_SYNC_PULSE |
280 			  MIPI_DSI_MODE_VIDEO_HSE;
281 
282 	ret = devm_mipi_dsi_attach(dev, dsi);
283 	if (ret < 0) {
284 		dev_err(dev, "failed to attach dsi to host\n");
285 		return ERR_PTR(ret);
286 	}
287 
288 	return dsi;
289 }
290 
lt9611uxc_connector_get_modes(struct drm_connector * connector)291 static int lt9611uxc_connector_get_modes(struct drm_connector *connector)
292 {
293 	struct lt9611uxc *lt9611uxc = connector_to_lt9611uxc(connector);
294 	unsigned int count;
295 	struct edid *edid;
296 
297 	edid = lt9611uxc->bridge.funcs->get_edid(&lt9611uxc->bridge, connector);
298 	drm_connector_update_edid_property(connector, edid);
299 	count = drm_add_edid_modes(connector, edid);
300 	kfree(edid);
301 
302 	return count;
303 }
304 
lt9611uxc_connector_detect(struct drm_connector * connector,bool force)305 static enum drm_connector_status lt9611uxc_connector_detect(struct drm_connector *connector,
306 							    bool force)
307 {
308 	struct lt9611uxc *lt9611uxc = connector_to_lt9611uxc(connector);
309 
310 	return lt9611uxc->bridge.funcs->detect(&lt9611uxc->bridge);
311 }
312 
lt9611uxc_connector_mode_valid(struct drm_connector * connector,struct drm_display_mode * mode)313 static enum drm_mode_status lt9611uxc_connector_mode_valid(struct drm_connector *connector,
314 							   struct drm_display_mode *mode)
315 {
316 	struct lt9611uxc_mode *lt9611uxc_mode = lt9611uxc_find_mode(mode);
317 
318 	return lt9611uxc_mode ? MODE_OK : MODE_BAD;
319 }
320 
321 static const struct drm_connector_helper_funcs lt9611uxc_bridge_connector_helper_funcs = {
322 	.get_modes = lt9611uxc_connector_get_modes,
323 	.mode_valid = lt9611uxc_connector_mode_valid,
324 };
325 
326 static const struct drm_connector_funcs lt9611uxc_bridge_connector_funcs = {
327 	.fill_modes = drm_helper_probe_single_connector_modes,
328 	.detect = lt9611uxc_connector_detect,
329 	.destroy = drm_connector_cleanup,
330 	.reset = drm_atomic_helper_connector_reset,
331 	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
332 	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
333 };
334 
lt9611uxc_connector_init(struct drm_bridge * bridge,struct lt9611uxc * lt9611uxc)335 static int lt9611uxc_connector_init(struct drm_bridge *bridge, struct lt9611uxc *lt9611uxc)
336 {
337 	int ret;
338 
339 	if (!bridge->encoder) {
340 		DRM_ERROR("Parent encoder object not found");
341 		return -ENODEV;
342 	}
343 
344 	lt9611uxc->connector.polled = DRM_CONNECTOR_POLL_HPD;
345 
346 	drm_connector_helper_add(&lt9611uxc->connector,
347 				 &lt9611uxc_bridge_connector_helper_funcs);
348 	ret = drm_connector_init(bridge->dev, &lt9611uxc->connector,
349 				 &lt9611uxc_bridge_connector_funcs,
350 				 DRM_MODE_CONNECTOR_HDMIA);
351 	if (ret) {
352 		DRM_ERROR("Failed to initialize connector with drm\n");
353 		return ret;
354 	}
355 
356 	return drm_connector_attach_encoder(&lt9611uxc->connector, bridge->encoder);
357 }
358 
lt9611uxc_bridge_attach(struct drm_bridge * bridge,enum drm_bridge_attach_flags flags)359 static int lt9611uxc_bridge_attach(struct drm_bridge *bridge,
360 				   enum drm_bridge_attach_flags flags)
361 {
362 	struct lt9611uxc *lt9611uxc = bridge_to_lt9611uxc(bridge);
363 	int ret;
364 
365 	if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
366 		ret = lt9611uxc_connector_init(bridge, lt9611uxc);
367 		if (ret < 0)
368 			return ret;
369 	}
370 
371 	return 0;
372 }
373 
374 static enum drm_mode_status
lt9611uxc_bridge_mode_valid(struct drm_bridge * bridge,const struct drm_display_info * info,const struct drm_display_mode * mode)375 lt9611uxc_bridge_mode_valid(struct drm_bridge *bridge,
376 			    const struct drm_display_info *info,
377 			    const struct drm_display_mode *mode)
378 {
379 	struct lt9611uxc_mode *lt9611uxc_mode;
380 
381 	lt9611uxc_mode = lt9611uxc_find_mode(mode);
382 
383 	return lt9611uxc_mode ? MODE_OK : MODE_BAD;
384 }
385 
lt9611uxc_video_setup(struct lt9611uxc * lt9611uxc,const struct drm_display_mode * mode)386 static void lt9611uxc_video_setup(struct lt9611uxc *lt9611uxc,
387 				  const struct drm_display_mode *mode)
388 {
389 	u32 h_total, hactive, hsync_len, hfront_porch;
390 	u32 v_total, vactive, vsync_len, vfront_porch;
391 
392 	h_total = mode->htotal;
393 	v_total = mode->vtotal;
394 
395 	hactive = mode->hdisplay;
396 	hsync_len = mode->hsync_end - mode->hsync_start;
397 	hfront_porch = mode->hsync_start - mode->hdisplay;
398 
399 	vactive = mode->vdisplay;
400 	vsync_len = mode->vsync_end - mode->vsync_start;
401 	vfront_porch = mode->vsync_start - mode->vdisplay;
402 
403 	regmap_write(lt9611uxc->regmap, 0xd00d, (u8)(v_total / 256));
404 	regmap_write(lt9611uxc->regmap, 0xd00e, (u8)(v_total % 256));
405 
406 	regmap_write(lt9611uxc->regmap, 0xd00f, (u8)(vactive / 256));
407 	regmap_write(lt9611uxc->regmap, 0xd010, (u8)(vactive % 256));
408 
409 	regmap_write(lt9611uxc->regmap, 0xd011, (u8)(h_total / 256));
410 	regmap_write(lt9611uxc->regmap, 0xd012, (u8)(h_total % 256));
411 
412 	regmap_write(lt9611uxc->regmap, 0xd013, (u8)(hactive / 256));
413 	regmap_write(lt9611uxc->regmap, 0xd014, (u8)(hactive % 256));
414 
415 	regmap_write(lt9611uxc->regmap, 0xd015, (u8)(vsync_len % 256));
416 
417 	regmap_update_bits(lt9611uxc->regmap, 0xd016, 0xf, (u8)(hsync_len / 256));
418 	regmap_write(lt9611uxc->regmap, 0xd017, (u8)(hsync_len % 256));
419 
420 	regmap_update_bits(lt9611uxc->regmap, 0xd018, 0xf, (u8)(vfront_porch / 256));
421 	regmap_write(lt9611uxc->regmap, 0xd019, (u8)(vfront_porch % 256));
422 
423 	regmap_update_bits(lt9611uxc->regmap, 0xd01a, 0xf, (u8)(hfront_porch / 256));
424 	regmap_write(lt9611uxc->regmap, 0xd01b, (u8)(hfront_porch % 256));
425 }
426 
lt9611uxc_bridge_mode_set(struct drm_bridge * bridge,const struct drm_display_mode * mode,const struct drm_display_mode * adj_mode)427 static void lt9611uxc_bridge_mode_set(struct drm_bridge *bridge,
428 				      const struct drm_display_mode *mode,
429 				      const struct drm_display_mode *adj_mode)
430 {
431 	struct lt9611uxc *lt9611uxc = bridge_to_lt9611uxc(bridge);
432 
433 	lt9611uxc_lock(lt9611uxc);
434 	lt9611uxc_video_setup(lt9611uxc, mode);
435 	lt9611uxc_unlock(lt9611uxc);
436 }
437 
lt9611uxc_bridge_detect(struct drm_bridge * bridge)438 static enum drm_connector_status lt9611uxc_bridge_detect(struct drm_bridge *bridge)
439 {
440 	struct lt9611uxc *lt9611uxc = bridge_to_lt9611uxc(bridge);
441 	unsigned int reg_val = 0;
442 	int ret;
443 	bool connected = true;
444 
445 	lt9611uxc_lock(lt9611uxc);
446 
447 	if (lt9611uxc->hpd_supported) {
448 		ret = regmap_read(lt9611uxc->regmap, 0xb023, &reg_val);
449 
450 		if (ret)
451 			dev_err(lt9611uxc->dev, "failed to read hpd status: %d\n", ret);
452 		else
453 			connected  = reg_val & BIT(1);
454 	}
455 	lt9611uxc->hdmi_connected = connected;
456 
457 	lt9611uxc_unlock(lt9611uxc);
458 
459 	return connected ?  connector_status_connected :
460 				connector_status_disconnected;
461 }
462 
lt9611uxc_wait_for_edid(struct lt9611uxc * lt9611uxc)463 static int lt9611uxc_wait_for_edid(struct lt9611uxc *lt9611uxc)
464 {
465 	return wait_event_interruptible_timeout(lt9611uxc->wq, lt9611uxc->edid_read,
466 			msecs_to_jiffies(500));
467 }
468 
lt9611uxc_get_edid_block(void * data,u8 * buf,unsigned int block,size_t len)469 static int lt9611uxc_get_edid_block(void *data, u8 *buf, unsigned int block, size_t len)
470 {
471 	struct lt9611uxc *lt9611uxc = data;
472 	int ret;
473 
474 	if (len > EDID_BLOCK_SIZE)
475 		return -EINVAL;
476 
477 	if (block >= EDID_NUM_BLOCKS)
478 		return -EINVAL;
479 
480 	lt9611uxc_lock(lt9611uxc);
481 
482 	regmap_write(lt9611uxc->regmap, 0xb00b, 0x10);
483 
484 	regmap_write(lt9611uxc->regmap, 0xb00a, block * EDID_BLOCK_SIZE);
485 
486 	ret = regmap_noinc_read(lt9611uxc->regmap, 0xb0b0, buf, len);
487 	if (ret)
488 		dev_err(lt9611uxc->dev, "edid read failed: %d\n", ret);
489 
490 	lt9611uxc_unlock(lt9611uxc);
491 
492 	return 0;
493 };
494 
lt9611uxc_bridge_get_edid(struct drm_bridge * bridge,struct drm_connector * connector)495 static struct edid *lt9611uxc_bridge_get_edid(struct drm_bridge *bridge,
496 					      struct drm_connector *connector)
497 {
498 	struct lt9611uxc *lt9611uxc = bridge_to_lt9611uxc(bridge);
499 	int ret;
500 
501 	ret = lt9611uxc_wait_for_edid(lt9611uxc);
502 	if (ret < 0) {
503 		dev_err(lt9611uxc->dev, "wait for EDID failed: %d\n", ret);
504 		return NULL;
505 	} else if (ret == 0) {
506 		dev_err(lt9611uxc->dev, "wait for EDID timeout\n");
507 		return NULL;
508 	}
509 
510 	return drm_do_get_edid(connector, lt9611uxc_get_edid_block, lt9611uxc);
511 }
512 
513 static const struct drm_bridge_funcs lt9611uxc_bridge_funcs = {
514 	.attach = lt9611uxc_bridge_attach,
515 	.mode_valid = lt9611uxc_bridge_mode_valid,
516 	.mode_set = lt9611uxc_bridge_mode_set,
517 	.detect = lt9611uxc_bridge_detect,
518 	.get_edid = lt9611uxc_bridge_get_edid,
519 };
520 
lt9611uxc_parse_dt(struct device * dev,struct lt9611uxc * lt9611uxc)521 static int lt9611uxc_parse_dt(struct device *dev,
522 			      struct lt9611uxc *lt9611uxc)
523 {
524 	lt9611uxc->dsi0_node = of_graph_get_remote_node(dev->of_node, 0, -1);
525 	if (!lt9611uxc->dsi0_node) {
526 		dev_err(lt9611uxc->dev, "failed to get remote node for primary dsi\n");
527 		return -ENODEV;
528 	}
529 
530 	lt9611uxc->dsi1_node = of_graph_get_remote_node(dev->of_node, 1, -1);
531 
532 	return 0;
533 }
534 
lt9611uxc_gpio_init(struct lt9611uxc * lt9611uxc)535 static int lt9611uxc_gpio_init(struct lt9611uxc *lt9611uxc)
536 {
537 	struct device *dev = lt9611uxc->dev;
538 
539 	lt9611uxc->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
540 	if (IS_ERR(lt9611uxc->reset_gpio)) {
541 		dev_err(dev, "failed to acquire reset gpio\n");
542 		return PTR_ERR(lt9611uxc->reset_gpio);
543 	}
544 
545 	lt9611uxc->enable_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_LOW);
546 	if (IS_ERR(lt9611uxc->enable_gpio)) {
547 		dev_err(dev, "failed to acquire enable gpio\n");
548 		return PTR_ERR(lt9611uxc->enable_gpio);
549 	}
550 
551 	return 0;
552 }
553 
lt9611uxc_read_device_rev(struct lt9611uxc * lt9611uxc)554 static int lt9611uxc_read_device_rev(struct lt9611uxc *lt9611uxc)
555 {
556 	unsigned int rev0, rev1, rev2;
557 	int ret;
558 
559 	lt9611uxc_lock(lt9611uxc);
560 
561 	ret = regmap_read(lt9611uxc->regmap, 0x8100, &rev0);
562 	ret |= regmap_read(lt9611uxc->regmap, 0x8101, &rev1);
563 	ret |= regmap_read(lt9611uxc->regmap, 0x8102, &rev2);
564 	if (ret)
565 		dev_err(lt9611uxc->dev, "failed to read revision: %d\n", ret);
566 	else
567 		dev_info(lt9611uxc->dev, "LT9611 revision: 0x%02x.%02x.%02x\n", rev0, rev1, rev2);
568 
569 	lt9611uxc_unlock(lt9611uxc);
570 
571 	return ret;
572 }
573 
lt9611uxc_read_version(struct lt9611uxc * lt9611uxc)574 static int lt9611uxc_read_version(struct lt9611uxc *lt9611uxc)
575 {
576 	unsigned int rev;
577 	int ret;
578 
579 	lt9611uxc_lock(lt9611uxc);
580 
581 	ret = regmap_read(lt9611uxc->regmap, 0xb021, &rev);
582 	if (ret)
583 		dev_err(lt9611uxc->dev, "failed to read revision: %d\n", ret);
584 	else
585 		dev_info(lt9611uxc->dev, "LT9611 version: 0x%02x\n", rev);
586 
587 	lt9611uxc_unlock(lt9611uxc);
588 
589 	return ret < 0 ? ret : rev;
590 }
591 
lt9611uxc_hdmi_hw_params(struct device * dev,void * data,struct hdmi_codec_daifmt * fmt,struct hdmi_codec_params * hparms)592 static int lt9611uxc_hdmi_hw_params(struct device *dev, void *data,
593 				    struct hdmi_codec_daifmt *fmt,
594 				    struct hdmi_codec_params *hparms)
595 {
596 	/*
597 	 * LT9611UXC will automatically detect rate and sample size, so no need
598 	 * to setup anything here.
599 	 */
600 	return 0;
601 }
602 
lt9611uxc_audio_shutdown(struct device * dev,void * data)603 static void lt9611uxc_audio_shutdown(struct device *dev, void *data)
604 {
605 }
606 
lt9611uxc_hdmi_i2s_get_dai_id(struct snd_soc_component * component,struct device_node * endpoint)607 static int lt9611uxc_hdmi_i2s_get_dai_id(struct snd_soc_component *component,
608 					 struct device_node *endpoint)
609 {
610 	struct of_endpoint of_ep;
611 	int ret;
612 
613 	ret = of_graph_parse_endpoint(endpoint, &of_ep);
614 	if (ret < 0)
615 		return ret;
616 
617 	/*
618 	 * HDMI sound should be located as reg = <2>
619 	 * Then, it is sound port 0
620 	 */
621 	if (of_ep.port == 2)
622 		return 0;
623 
624 	return -EINVAL;
625 }
626 
627 static const struct hdmi_codec_ops lt9611uxc_codec_ops = {
628 	.hw_params	= lt9611uxc_hdmi_hw_params,
629 	.audio_shutdown = lt9611uxc_audio_shutdown,
630 	.get_dai_id	= lt9611uxc_hdmi_i2s_get_dai_id,
631 };
632 
lt9611uxc_audio_init(struct device * dev,struct lt9611uxc * lt9611uxc)633 static int lt9611uxc_audio_init(struct device *dev, struct lt9611uxc *lt9611uxc)
634 {
635 	struct hdmi_codec_pdata codec_data = {
636 		.ops = &lt9611uxc_codec_ops,
637 		.max_i2s_channels = 2,
638 		.i2s = 1,
639 		.data = lt9611uxc,
640 	};
641 
642 	lt9611uxc->audio_pdev =
643 		platform_device_register_data(dev, HDMI_CODEC_DRV_NAME,
644 					      PLATFORM_DEVID_AUTO,
645 					      &codec_data, sizeof(codec_data));
646 
647 	return PTR_ERR_OR_ZERO(lt9611uxc->audio_pdev);
648 }
649 
lt9611uxc_audio_exit(struct lt9611uxc * lt9611uxc)650 static void lt9611uxc_audio_exit(struct lt9611uxc *lt9611uxc)
651 {
652 	if (lt9611uxc->audio_pdev) {
653 		platform_device_unregister(lt9611uxc->audio_pdev);
654 		lt9611uxc->audio_pdev = NULL;
655 	}
656 }
657 
658 #define LT9611UXC_FW_PAGE_SIZE 32
lt9611uxc_firmware_write_page(struct lt9611uxc * lt9611uxc,u16 addr,const u8 * buf)659 static void lt9611uxc_firmware_write_page(struct lt9611uxc *lt9611uxc, u16 addr, const u8 *buf)
660 {
661 	struct reg_sequence seq_write_prepare[] = {
662 		REG_SEQ0(0x805a, 0x04),
663 		REG_SEQ0(0x805a, 0x00),
664 
665 		REG_SEQ0(0x805e, 0xdf),
666 		REG_SEQ0(0x805a, 0x20),
667 		REG_SEQ0(0x805a, 0x00),
668 		REG_SEQ0(0x8058, 0x21),
669 	};
670 
671 	struct reg_sequence seq_write_addr[] = {
672 		REG_SEQ0(0x805b, (addr >> 16) & 0xff),
673 		REG_SEQ0(0x805c, (addr >> 8) & 0xff),
674 		REG_SEQ0(0x805d, addr & 0xff),
675 		REG_SEQ0(0x805a, 0x10),
676 		REG_SEQ0(0x805a, 0x00),
677 	};
678 
679 	regmap_write(lt9611uxc->regmap, 0x8108, 0xbf);
680 	msleep(20);
681 	regmap_write(lt9611uxc->regmap, 0x8108, 0xff);
682 	msleep(20);
683 	regmap_multi_reg_write(lt9611uxc->regmap, seq_write_prepare, ARRAY_SIZE(seq_write_prepare));
684 	regmap_noinc_write(lt9611uxc->regmap, 0x8059, buf, LT9611UXC_FW_PAGE_SIZE);
685 	regmap_multi_reg_write(lt9611uxc->regmap, seq_write_addr, ARRAY_SIZE(seq_write_addr));
686 	msleep(20);
687 }
688 
lt9611uxc_firmware_read_page(struct lt9611uxc * lt9611uxc,u16 addr,char * buf)689 static void lt9611uxc_firmware_read_page(struct lt9611uxc *lt9611uxc, u16 addr, char *buf)
690 {
691 	struct reg_sequence seq_read_page[] = {
692 		REG_SEQ0(0x805a, 0xa0),
693 		REG_SEQ0(0x805a, 0x80),
694 		REG_SEQ0(0x805b, (addr >> 16) & 0xff),
695 		REG_SEQ0(0x805c, (addr >> 8) & 0xff),
696 		REG_SEQ0(0x805d, addr & 0xff),
697 		REG_SEQ0(0x805a, 0x90),
698 		REG_SEQ0(0x805a, 0x80),
699 		REG_SEQ0(0x8058, 0x21),
700 	};
701 
702 	regmap_multi_reg_write(lt9611uxc->regmap, seq_read_page, ARRAY_SIZE(seq_read_page));
703 	regmap_noinc_read(lt9611uxc->regmap, 0x805f, buf, LT9611UXC_FW_PAGE_SIZE);
704 }
705 
lt9611uxc_firmware_read(struct lt9611uxc * lt9611uxc,size_t size)706 static char *lt9611uxc_firmware_read(struct lt9611uxc *lt9611uxc, size_t size)
707 {
708 	struct reg_sequence seq_read_setup[] = {
709 		REG_SEQ0(0x805a, 0x84),
710 		REG_SEQ0(0x805a, 0x80),
711 	};
712 
713 	char *readbuf;
714 	u16 offset;
715 
716 	readbuf = kzalloc(ALIGN(size, 32), GFP_KERNEL);
717 	if (!readbuf)
718 		return NULL;
719 
720 	regmap_multi_reg_write(lt9611uxc->regmap, seq_read_setup, ARRAY_SIZE(seq_read_setup));
721 
722 	for (offset = 0;
723 	     offset < size;
724 	     offset += LT9611UXC_FW_PAGE_SIZE)
725 		lt9611uxc_firmware_read_page(lt9611uxc, offset, &readbuf[offset]);
726 
727 	return readbuf;
728 }
729 
lt9611uxc_firmware_update(struct lt9611uxc * lt9611uxc)730 static int lt9611uxc_firmware_update(struct lt9611uxc *lt9611uxc)
731 {
732 	int ret;
733 	u16 offset;
734 	size_t remain;
735 	char *readbuf;
736 	const struct firmware *fw;
737 
738 	struct reg_sequence seq_setup[] = {
739 		REG_SEQ0(0x805e, 0xdf),
740 		REG_SEQ0(0x8058, 0x00),
741 		REG_SEQ0(0x8059, 0x50),
742 		REG_SEQ0(0x805a, 0x10),
743 		REG_SEQ0(0x805a, 0x00),
744 	};
745 
746 
747 	struct reg_sequence seq_block_erase[] = {
748 		REG_SEQ0(0x805a, 0x04),
749 		REG_SEQ0(0x805a, 0x00),
750 		REG_SEQ0(0x805b, 0x00),
751 		REG_SEQ0(0x805c, 0x00),
752 		REG_SEQ0(0x805d, 0x00),
753 		REG_SEQ0(0x805a, 0x01),
754 		REG_SEQ0(0x805a, 0x00),
755 	};
756 
757 	ret = request_firmware(&fw, FW_FILE, lt9611uxc->dev);
758 	if (ret < 0)
759 		return ret;
760 
761 	dev_info(lt9611uxc->dev, "Updating firmware\n");
762 	lt9611uxc_lock(lt9611uxc);
763 
764 	regmap_multi_reg_write(lt9611uxc->regmap, seq_setup, ARRAY_SIZE(seq_setup));
765 
766 	/*
767 	 * Need erase block 2 timess here. Sometimes, block erase can fail.
768 	 * This is a workaroud.
769 	 */
770 	regmap_multi_reg_write(lt9611uxc->regmap, seq_block_erase, ARRAY_SIZE(seq_block_erase));
771 	msleep(3000);
772 	regmap_multi_reg_write(lt9611uxc->regmap, seq_block_erase, ARRAY_SIZE(seq_block_erase));
773 	msleep(3000);
774 
775 	for (offset = 0, remain = fw->size;
776 	     remain >= LT9611UXC_FW_PAGE_SIZE;
777 	     offset += LT9611UXC_FW_PAGE_SIZE, remain -= LT9611UXC_FW_PAGE_SIZE)
778 		lt9611uxc_firmware_write_page(lt9611uxc, offset, fw->data + offset);
779 
780 	if (remain > 0) {
781 		char buf[LT9611UXC_FW_PAGE_SIZE];
782 
783 		memset(buf, 0xff, LT9611UXC_FW_PAGE_SIZE);
784 		memcpy(buf, fw->data + offset, remain);
785 		lt9611uxc_firmware_write_page(lt9611uxc, offset, buf);
786 	}
787 	msleep(20);
788 
789 	readbuf = lt9611uxc_firmware_read(lt9611uxc, fw->size);
790 	if (!readbuf) {
791 		ret = -ENOMEM;
792 		goto out;
793 	}
794 
795 	if (!memcmp(readbuf, fw->data, fw->size)) {
796 		dev_err(lt9611uxc->dev, "Firmware update failed\n");
797 		print_hex_dump(KERN_ERR, "fw: ", DUMP_PREFIX_OFFSET, 16, 1, readbuf, fw->size, false);
798 		ret = -EINVAL;
799 	} else {
800 		dev_info(lt9611uxc->dev, "Firmware updates successfully\n");
801 		ret = 0;
802 	}
803 	kfree(readbuf);
804 
805 out:
806 	lt9611uxc_unlock(lt9611uxc);
807 	lt9611uxc_reset(lt9611uxc);
808 	release_firmware(fw);
809 
810 	return ret;
811 }
812 
lt9611uxc_firmware_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t len)813 static ssize_t lt9611uxc_firmware_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t len)
814 {
815 	struct lt9611uxc *lt9611uxc = dev_get_drvdata(dev);
816 	int ret;
817 
818 	ret = lt9611uxc_firmware_update(lt9611uxc);
819 	if (ret < 0)
820 		return ret;
821 	return len;
822 }
823 
lt9611uxc_firmware_show(struct device * dev,struct device_attribute * attr,char * buf)824 static ssize_t lt9611uxc_firmware_show(struct device *dev, struct device_attribute *attr, char *buf)
825 {
826 	struct lt9611uxc *lt9611uxc = dev_get_drvdata(dev);
827 
828 	return sysfs_emit(buf, "%02x\n", lt9611uxc->fw_version);
829 }
830 
831 static DEVICE_ATTR_RW(lt9611uxc_firmware);
832 
833 static struct attribute *lt9611uxc_attrs[] = {
834 	&dev_attr_lt9611uxc_firmware.attr,
835 	NULL,
836 };
837 
838 static const struct attribute_group lt9611uxc_attr_group = {
839 	.attrs = lt9611uxc_attrs,
840 };
841 
842 static const struct attribute_group *lt9611uxc_attr_groups[] = {
843 	&lt9611uxc_attr_group,
844 	NULL,
845 };
846 
lt9611uxc_probe(struct i2c_client * client)847 static int lt9611uxc_probe(struct i2c_client *client)
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 = 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(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 = request_threaded_irq(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 	free_irq(client->irq, lt9611uxc);
969 	cancel_work_sync(&lt9611uxc->work);
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 
lt9611uxc_remove(struct i2c_client * client)982 static void lt9611uxc_remove(struct i2c_client *client)
983 {
984 	struct lt9611uxc *lt9611uxc = i2c_get_clientdata(client);
985 
986 	free_irq(client->irq, lt9611uxc);
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