1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Driver for Analog Devices ADV748X HDMI receiver with AFE
4  *
5  * Copyright (C) 2017 Renesas Electronics Corp.
6  *
7  * Authors:
8  *	Koji Matsuoka <koji.matsuoka.xm@renesas.com>
9  *	Niklas Söderlund <niklas.soderlund@ragnatech.se>
10  *	Kieran Bingham <kieran.bingham@ideasonboard.com>
11  */
12 
13 #include <linux/delay.h>
14 #include <linux/errno.h>
15 #include <linux/i2c.h>
16 #include <linux/module.h>
17 #include <linux/mutex.h>
18 #include <linux/of_graph.h>
19 #include <linux/regmap.h>
20 #include <linux/slab.h>
21 #include <linux/v4l2-dv-timings.h>
22 
23 #include <media/v4l2-ctrls.h>
24 #include <media/v4l2-device.h>
25 #include <media/v4l2-dv-timings.h>
26 #include <media/v4l2-fwnode.h>
27 #include <media/v4l2-ioctl.h>
28 
29 #include "adv748x.h"
30 
31 /* -----------------------------------------------------------------------------
32  * Register manipulation
33  */
34 
35 #define ADV748X_REGMAP_CONF(n) \
36 { \
37 	.name = n, \
38 	.reg_bits = 8, \
39 	.val_bits = 8, \
40 	.max_register = 0xff, \
41 	.cache_type = REGCACHE_NONE, \
42 }
43 
44 static const struct regmap_config adv748x_regmap_cnf[] = {
45 	ADV748X_REGMAP_CONF("io"),
46 	ADV748X_REGMAP_CONF("dpll"),
47 	ADV748X_REGMAP_CONF("cp"),
48 	ADV748X_REGMAP_CONF("hdmi"),
49 	ADV748X_REGMAP_CONF("edid"),
50 	ADV748X_REGMAP_CONF("repeater"),
51 	ADV748X_REGMAP_CONF("infoframe"),
52 	ADV748X_REGMAP_CONF("cbus"),
53 	ADV748X_REGMAP_CONF("cec"),
54 	ADV748X_REGMAP_CONF("sdp"),
55 	ADV748X_REGMAP_CONF("txa"),
56 	ADV748X_REGMAP_CONF("txb"),
57 };
58 
59 static int adv748x_configure_regmap(struct adv748x_state *state, int region)
60 {
61 	int err;
62 
63 	if (!state->i2c_clients[region])
64 		return -ENODEV;
65 
66 	state->regmap[region] =
67 		devm_regmap_init_i2c(state->i2c_clients[region],
68 				     &adv748x_regmap_cnf[region]);
69 
70 	if (IS_ERR(state->regmap[region])) {
71 		err = PTR_ERR(state->regmap[region]);
72 		adv_err(state,
73 			"Error initializing regmap %d with error %d\n",
74 			region, err);
75 		return -EINVAL;
76 	}
77 
78 	return 0;
79 }
80 struct adv748x_register_map {
81 	const char *name;
82 	u8 default_addr;
83 };
84 
85 static const struct adv748x_register_map adv748x_default_addresses[] = {
86 	[ADV748X_PAGE_IO] = { "main", 0x70 },
87 	[ADV748X_PAGE_DPLL] = { "dpll", 0x26 },
88 	[ADV748X_PAGE_CP] = { "cp", 0x22 },
89 	[ADV748X_PAGE_HDMI] = { "hdmi", 0x34 },
90 	[ADV748X_PAGE_EDID] = { "edid", 0x36 },
91 	[ADV748X_PAGE_REPEATER] = { "repeater", 0x32 },
92 	[ADV748X_PAGE_INFOFRAME] = { "infoframe", 0x31 },
93 	[ADV748X_PAGE_CBUS] = { "cbus", 0x30 },
94 	[ADV748X_PAGE_CEC] = { "cec", 0x41 },
95 	[ADV748X_PAGE_SDP] = { "sdp", 0x79 },
96 	[ADV748X_PAGE_TXB] = { "txb", 0x48 },
97 	[ADV748X_PAGE_TXA] = { "txa", 0x4a },
98 };
99 
100 static int adv748x_read_check(struct adv748x_state *state,
101 			      int client_page, u8 reg)
102 {
103 	struct i2c_client *client = state->i2c_clients[client_page];
104 	int err;
105 	unsigned int val;
106 
107 	err = regmap_read(state->regmap[client_page], reg, &val);
108 
109 	if (err) {
110 		adv_err(state, "error reading %02x, %02x\n",
111 				client->addr, reg);
112 		return err;
113 	}
114 
115 	return val;
116 }
117 
118 int adv748x_read(struct adv748x_state *state, u8 page, u8 reg)
119 {
120 	return adv748x_read_check(state, page, reg);
121 }
122 
123 int adv748x_write(struct adv748x_state *state, u8 page, u8 reg, u8 value)
124 {
125 	return regmap_write(state->regmap[page], reg, value);
126 }
127 
128 static int adv748x_write_check(struct adv748x_state *state, u8 page, u8 reg,
129 			       u8 value, int *error)
130 {
131 	if (*error)
132 		return *error;
133 
134 	*error = adv748x_write(state, page, reg, value);
135 	return *error;
136 }
137 
138 /* adv748x_write_block(): Write raw data with a maximum of I2C_SMBUS_BLOCK_MAX
139  * size to one or more registers.
140  *
141  * A value of zero will be returned on success, a negative errno will
142  * be returned in error cases.
143  */
144 int adv748x_write_block(struct adv748x_state *state, int client_page,
145 			unsigned int init_reg, const void *val,
146 			size_t val_len)
147 {
148 	struct regmap *regmap = state->regmap[client_page];
149 
150 	if (val_len > I2C_SMBUS_BLOCK_MAX)
151 		val_len = I2C_SMBUS_BLOCK_MAX;
152 
153 	return regmap_raw_write(regmap, init_reg, val, val_len);
154 }
155 
156 static int adv748x_set_slave_addresses(struct adv748x_state *state)
157 {
158 	struct i2c_client *client;
159 	unsigned int i;
160 	u8 io_reg;
161 
162 	for (i = ADV748X_PAGE_DPLL; i < ADV748X_PAGE_MAX; ++i) {
163 		io_reg = ADV748X_IO_SLAVE_ADDR_BASE + i;
164 		client = state->i2c_clients[i];
165 
166 		io_write(state, io_reg, client->addr << 1);
167 	}
168 
169 	return 0;
170 }
171 
172 static void adv748x_unregister_clients(struct adv748x_state *state)
173 {
174 	unsigned int i;
175 
176 	for (i = 1; i < ARRAY_SIZE(state->i2c_clients); ++i)
177 		i2c_unregister_device(state->i2c_clients[i]);
178 }
179 
180 static int adv748x_initialise_clients(struct adv748x_state *state)
181 {
182 	unsigned int i;
183 	int ret;
184 
185 	for (i = ADV748X_PAGE_DPLL; i < ADV748X_PAGE_MAX; ++i) {
186 		state->i2c_clients[i] = i2c_new_ancillary_device(
187 				state->client,
188 				adv748x_default_addresses[i].name,
189 				adv748x_default_addresses[i].default_addr);
190 
191 		if (IS_ERR(state->i2c_clients[i])) {
192 			adv_err(state, "failed to create i2c client %u\n", i);
193 			return PTR_ERR(state->i2c_clients[i]);
194 		}
195 
196 		ret = adv748x_configure_regmap(state, i);
197 		if (ret)
198 			return ret;
199 	}
200 
201 	return 0;
202 }
203 
204 /**
205  * struct adv748x_reg_value - Register write instruction
206  * @page:		Regmap page identifier
207  * @reg:		I2C register
208  * @value:		value to write to @page at @reg
209  */
210 struct adv748x_reg_value {
211 	u8 page;
212 	u8 reg;
213 	u8 value;
214 };
215 
216 static int adv748x_write_regs(struct adv748x_state *state,
217 			      const struct adv748x_reg_value *regs)
218 {
219 	int ret;
220 
221 	for (; regs->page != ADV748X_PAGE_EOR; regs++) {
222 		ret = adv748x_write(state, regs->page, regs->reg, regs->value);
223 		if (ret < 0) {
224 			adv_err(state, "Error regs page: 0x%02x reg: 0x%02x\n",
225 				regs->page, regs->reg);
226 			return ret;
227 		}
228 	}
229 
230 	return 0;
231 }
232 
233 /* -----------------------------------------------------------------------------
234  * TXA and TXB
235  */
236 
237 static int adv748x_power_up_tx(struct adv748x_csi2 *tx)
238 {
239 	struct adv748x_state *state = tx->state;
240 	u8 page = is_txa(tx) ? ADV748X_PAGE_TXA : ADV748X_PAGE_TXB;
241 	int ret = 0;
242 
243 	/* Enable n-lane MIPI */
244 	adv748x_write_check(state, page, 0x00, 0x80 | tx->active_lanes, &ret);
245 
246 	/* Set Auto DPHY Timing */
247 	adv748x_write_check(state, page, 0x00, 0xa0 | tx->active_lanes, &ret);
248 
249 	/* ADI Required Write */
250 	if (tx->src == &state->hdmi.sd) {
251 		adv748x_write_check(state, page, 0xdb, 0x10, &ret);
252 		adv748x_write_check(state, page, 0xd6, 0x07, &ret);
253 	} else {
254 		adv748x_write_check(state, page, 0xd2, 0x40, &ret);
255 	}
256 
257 	adv748x_write_check(state, page, 0xc4, 0x0a, &ret);
258 	adv748x_write_check(state, page, 0x71, 0x33, &ret);
259 	adv748x_write_check(state, page, 0x72, 0x11, &ret);
260 
261 	/* i2c_dphy_pwdn - 1'b0 */
262 	adv748x_write_check(state, page, 0xf0, 0x00, &ret);
263 
264 	/* ADI Required Writes*/
265 	adv748x_write_check(state, page, 0x31, 0x82, &ret);
266 	adv748x_write_check(state, page, 0x1e, 0x40, &ret);
267 
268 	/* i2c_mipi_pll_en - 1'b1 */
269 	adv748x_write_check(state, page, 0xda, 0x01, &ret);
270 	usleep_range(2000, 2500);
271 
272 	/* Power-up CSI-TX */
273 	adv748x_write_check(state, page, 0x00, 0x20 | tx->active_lanes, &ret);
274 	usleep_range(1000, 1500);
275 
276 	/* ADI Required Writes */
277 	adv748x_write_check(state, page, 0xc1, 0x2b, &ret);
278 	usleep_range(1000, 1500);
279 	adv748x_write_check(state, page, 0x31, 0x80, &ret);
280 
281 	return ret;
282 }
283 
284 static int adv748x_power_down_tx(struct adv748x_csi2 *tx)
285 {
286 	struct adv748x_state *state = tx->state;
287 	u8 page = is_txa(tx) ? ADV748X_PAGE_TXA : ADV748X_PAGE_TXB;
288 	int ret = 0;
289 
290 	/* ADI Required Writes */
291 	adv748x_write_check(state, page, 0x31, 0x82, &ret);
292 	adv748x_write_check(state, page, 0x1e, 0x00, &ret);
293 
294 	/* Enable n-lane MIPI */
295 	adv748x_write_check(state, page, 0x00, 0x80 | tx->active_lanes, &ret);
296 
297 	/* i2c_mipi_pll_en - 1'b1 */
298 	adv748x_write_check(state, page, 0xda, 0x01, &ret);
299 
300 	/* ADI Required Write */
301 	adv748x_write_check(state, page, 0xc1, 0x3b, &ret);
302 
303 	return ret;
304 }
305 
306 int adv748x_tx_power(struct adv748x_csi2 *tx, bool on)
307 {
308 	int val;
309 
310 	if (!is_tx_enabled(tx))
311 		return 0;
312 
313 	val = tx_read(tx, ADV748X_CSI_FS_AS_LS);
314 	if (val < 0)
315 		return val;
316 
317 	/*
318 	 * This test against BIT(6) is not documented by the datasheet, but was
319 	 * specified in the downstream driver.
320 	 * Track with a WARN_ONCE to determine if it is ever set by HW.
321 	 */
322 	WARN_ONCE((on && val & ADV748X_CSI_FS_AS_LS_UNKNOWN),
323 			"Enabling with unknown bit set");
324 
325 	return on ? adv748x_power_up_tx(tx) : adv748x_power_down_tx(tx);
326 }
327 
328 /* -----------------------------------------------------------------------------
329  * Media Operations
330  */
331 static int adv748x_link_setup(struct media_entity *entity,
332 			      const struct media_pad *local,
333 			      const struct media_pad *remote, u32 flags)
334 {
335 	struct v4l2_subdev *rsd = media_entity_to_v4l2_subdev(remote->entity);
336 	struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity);
337 	struct adv748x_state *state = v4l2_get_subdevdata(sd);
338 	struct adv748x_csi2 *tx = adv748x_sd_to_csi2(sd);
339 	bool enable = flags & MEDIA_LNK_FL_ENABLED;
340 	u8 io10_mask = ADV748X_IO_10_CSI1_EN |
341 		       ADV748X_IO_10_CSI4_EN |
342 		       ADV748X_IO_10_CSI4_IN_SEL_AFE;
343 	u8 io10 = 0;
344 
345 	/* Refuse to enable multiple links to the same TX at the same time. */
346 	if (enable && tx->src)
347 		return -EINVAL;
348 
349 	/* Set or clear the source (HDMI or AFE) and the current TX. */
350 	if (rsd == &state->afe.sd)
351 		state->afe.tx = enable ? tx : NULL;
352 	else
353 		state->hdmi.tx = enable ? tx : NULL;
354 
355 	tx->src = enable ? rsd : NULL;
356 
357 	if (state->afe.tx) {
358 		/* AFE Requires TXA enabled, even when output to TXB */
359 		io10 |= ADV748X_IO_10_CSI4_EN;
360 		if (is_txa(tx)) {
361 			/*
362 			 * Output from the SD-core (480i and 576i) from the TXA
363 			 * interface requires reducing the number of enabled
364 			 * data lanes in order to guarantee a valid link
365 			 * frequency.
366 			 */
367 			tx->active_lanes = min(tx->num_lanes, 2U);
368 			io10 |= ADV748X_IO_10_CSI4_IN_SEL_AFE;
369 		} else {
370 			/* TXB has a single data lane, no need to adjust. */
371 			io10 |= ADV748X_IO_10_CSI1_EN;
372 		}
373 	}
374 
375 	if (state->hdmi.tx) {
376 		/*
377 		 * Restore the number of active lanes, in case we have gone
378 		 * through an AFE->TXA streaming sessions.
379 		 */
380 		tx->active_lanes = tx->num_lanes;
381 		io10 |= ADV748X_IO_10_CSI4_EN;
382 	}
383 
384 	return io_clrset(state, ADV748X_IO_10, io10_mask, io10);
385 }
386 
387 static const struct media_entity_operations adv748x_tx_media_ops = {
388 	.link_setup	= adv748x_link_setup,
389 	.link_validate	= v4l2_subdev_link_validate,
390 };
391 
392 static const struct media_entity_operations adv748x_media_ops = {
393 	.link_validate = v4l2_subdev_link_validate,
394 };
395 
396 /* -----------------------------------------------------------------------------
397  * HW setup
398  */
399 
400 /* Initialize CP Core with RGB888 format. */
401 static const struct adv748x_reg_value adv748x_init_hdmi[] = {
402 	/* Disable chip powerdown & Enable HDMI Rx block */
403 	{ADV748X_PAGE_IO, 0x00, 0x40},
404 
405 	{ADV748X_PAGE_REPEATER, 0x40, 0x83}, /* Enable HDCP 1.1 */
406 
407 	{ADV748X_PAGE_HDMI, 0x00, 0x08},/* Foreground Channel = A */
408 	{ADV748X_PAGE_HDMI, 0x98, 0xff},/* ADI Required Write */
409 	{ADV748X_PAGE_HDMI, 0x99, 0xa3},/* ADI Required Write */
410 	{ADV748X_PAGE_HDMI, 0x9a, 0x00},/* ADI Required Write */
411 	{ADV748X_PAGE_HDMI, 0x9b, 0x0a},/* ADI Required Write */
412 	{ADV748X_PAGE_HDMI, 0x9d, 0x40},/* ADI Required Write */
413 	{ADV748X_PAGE_HDMI, 0xcb, 0x09},/* ADI Required Write */
414 	{ADV748X_PAGE_HDMI, 0x3d, 0x10},/* ADI Required Write */
415 	{ADV748X_PAGE_HDMI, 0x3e, 0x7b},/* ADI Required Write */
416 	{ADV748X_PAGE_HDMI, 0x3f, 0x5e},/* ADI Required Write */
417 	{ADV748X_PAGE_HDMI, 0x4e, 0xfe},/* ADI Required Write */
418 	{ADV748X_PAGE_HDMI, 0x4f, 0x18},/* ADI Required Write */
419 	{ADV748X_PAGE_HDMI, 0x57, 0xa3},/* ADI Required Write */
420 	{ADV748X_PAGE_HDMI, 0x58, 0x04},/* ADI Required Write */
421 	{ADV748X_PAGE_HDMI, 0x85, 0x10},/* ADI Required Write */
422 
423 	{ADV748X_PAGE_HDMI, 0x83, 0x00},/* Enable All Terminations */
424 	{ADV748X_PAGE_HDMI, 0xa3, 0x01},/* ADI Required Write */
425 	{ADV748X_PAGE_HDMI, 0xbe, 0x00},/* ADI Required Write */
426 
427 	{ADV748X_PAGE_HDMI, 0x6c, 0x01},/* HPA Manual Enable */
428 	{ADV748X_PAGE_HDMI, 0xf8, 0x01},/* HPA Asserted */
429 	{ADV748X_PAGE_HDMI, 0x0f, 0x00},/* Audio Mute Speed Set to Fastest */
430 	/* (Smallest Step Size) */
431 
432 	{ADV748X_PAGE_IO, 0x04, 0x02},	/* RGB Out of CP */
433 	{ADV748X_PAGE_IO, 0x12, 0xf0},	/* CSC Depends on ip Packets, SDR 444 */
434 	{ADV748X_PAGE_IO, 0x17, 0x80},	/* Luma & Chroma can reach 254d */
435 	{ADV748X_PAGE_IO, 0x03, 0x86},	/* CP-Insert_AV_Code */
436 
437 	{ADV748X_PAGE_CP, 0x7c, 0x00},	/* ADI Required Write */
438 
439 	{ADV748X_PAGE_IO, 0x0c, 0xe0},	/* Enable LLC_DLL & Double LLC Timing */
440 	{ADV748X_PAGE_IO, 0x0e, 0xdd},	/* LLC/PIX/SPI PINS TRISTATED AUD */
441 
442 	{ADV748X_PAGE_EOR, 0xff, 0xff}	/* End of register table */
443 };
444 
445 /* Initialize AFE core with YUV8 format. */
446 static const struct adv748x_reg_value adv748x_init_afe[] = {
447 	{ADV748X_PAGE_IO, 0x00, 0x30},	/* Disable chip powerdown Rx */
448 	{ADV748X_PAGE_IO, 0xf2, 0x01},	/* Enable I2C Read Auto-Increment */
449 
450 	{ADV748X_PAGE_IO, 0x0e, 0xff},	/* LLC/PIX/AUD/SPI PINS TRISTATED */
451 
452 	{ADV748X_PAGE_SDP, 0x0f, 0x00},	/* Exit Power Down Mode */
453 	{ADV748X_PAGE_SDP, 0x52, 0xcd},	/* ADI Required Write */
454 
455 	{ADV748X_PAGE_SDP, 0x0e, 0x80},	/* ADI Required Write */
456 	{ADV748X_PAGE_SDP, 0x9c, 0x00},	/* ADI Required Write */
457 	{ADV748X_PAGE_SDP, 0x9c, 0xff},	/* ADI Required Write */
458 	{ADV748X_PAGE_SDP, 0x0e, 0x00},	/* ADI Required Write */
459 
460 	/* ADI recommended writes for improved video quality */
461 	{ADV748X_PAGE_SDP, 0x80, 0x51},	/* ADI Required Write */
462 	{ADV748X_PAGE_SDP, 0x81, 0x51},	/* ADI Required Write */
463 	{ADV748X_PAGE_SDP, 0x82, 0x68},	/* ADI Required Write */
464 
465 	{ADV748X_PAGE_SDP, 0x03, 0x42},	/* Tri-S Output , PwrDwn 656 pads */
466 	{ADV748X_PAGE_SDP, 0x04, 0xb5},	/* ITU-R BT.656-4 compatible */
467 	{ADV748X_PAGE_SDP, 0x13, 0x00},	/* ADI Required Write */
468 
469 	{ADV748X_PAGE_SDP, 0x17, 0x41},	/* Select SH1 */
470 	{ADV748X_PAGE_SDP, 0x31, 0x12},	/* ADI Required Write */
471 	{ADV748X_PAGE_SDP, 0xe6, 0x4f},  /* V bit end pos manually in NTSC */
472 
473 	{ADV748X_PAGE_EOR, 0xff, 0xff}	/* End of register table */
474 };
475 
476 static int adv748x_sw_reset(struct adv748x_state *state)
477 {
478 	int ret;
479 
480 	ret = io_write(state, ADV748X_IO_REG_FF, ADV748X_IO_REG_FF_MAIN_RESET);
481 	if (ret)
482 		return ret;
483 
484 	usleep_range(5000, 6000);
485 
486 	/* Disable CEC Wakeup from power-down mode */
487 	ret = io_clrset(state, ADV748X_IO_REG_01, ADV748X_IO_REG_01_PWRDN_MASK,
488 			ADV748X_IO_REG_01_PWRDNB);
489 	if (ret)
490 		return ret;
491 
492 	/* Enable I2C Read Auto-Increment for consecutive reads */
493 	return io_write(state, ADV748X_IO_REG_F2,
494 			ADV748X_IO_REG_F2_READ_AUTO_INC);
495 }
496 
497 static int adv748x_reset(struct adv748x_state *state)
498 {
499 	int ret;
500 	u8 regval = 0;
501 
502 	ret = adv748x_sw_reset(state);
503 	if (ret < 0)
504 		return ret;
505 
506 	ret = adv748x_set_slave_addresses(state);
507 	if (ret < 0)
508 		return ret;
509 
510 	/* Initialize CP and AFE cores. */
511 	ret = adv748x_write_regs(state, adv748x_init_hdmi);
512 	if (ret)
513 		return ret;
514 
515 	ret = adv748x_write_regs(state, adv748x_init_afe);
516 	if (ret)
517 		return ret;
518 
519 	adv748x_afe_s_input(&state->afe, state->afe.input);
520 
521 	adv_dbg(state, "AFE Default input set to %d\n", state->afe.input);
522 
523 	/* Reset TXA and TXB */
524 	adv748x_tx_power(&state->txa, 1);
525 	adv748x_tx_power(&state->txa, 0);
526 	adv748x_tx_power(&state->txb, 1);
527 	adv748x_tx_power(&state->txb, 0);
528 
529 	/* Disable chip powerdown & Enable HDMI Rx block */
530 	io_write(state, ADV748X_IO_PD, ADV748X_IO_PD_RX_EN);
531 
532 	/* Conditionally enable TXa and TXb. */
533 	if (is_tx_enabled(&state->txa)) {
534 		regval |= ADV748X_IO_10_CSI4_EN;
535 		adv748x_csi2_set_virtual_channel(&state->txa, 0);
536 	}
537 	if (is_tx_enabled(&state->txb)) {
538 		regval |= ADV748X_IO_10_CSI1_EN;
539 		adv748x_csi2_set_virtual_channel(&state->txb, 0);
540 	}
541 	io_write(state, ADV748X_IO_10, regval);
542 
543 	/* Use vid_std and v_freq as freerun resolution for CP */
544 	cp_clrset(state, ADV748X_CP_CLMP_POS, ADV748X_CP_CLMP_POS_DIS_AUTO,
545 					      ADV748X_CP_CLMP_POS_DIS_AUTO);
546 
547 	return 0;
548 }
549 
550 static int adv748x_identify_chip(struct adv748x_state *state)
551 {
552 	int msb, lsb;
553 
554 	lsb = io_read(state, ADV748X_IO_CHIP_REV_ID_1);
555 	msb = io_read(state, ADV748X_IO_CHIP_REV_ID_2);
556 
557 	if (lsb < 0 || msb < 0) {
558 		adv_err(state, "Failed to read chip revision\n");
559 		return -EIO;
560 	}
561 
562 	adv_info(state, "chip found @ 0x%02x revision %02x%02x\n",
563 		 state->client->addr << 1, lsb, msb);
564 
565 	return 0;
566 }
567 
568 /* -----------------------------------------------------------------------------
569  * Suspend / Resume
570  */
571 
572 static int __maybe_unused adv748x_resume_early(struct device *dev)
573 {
574 	struct i2c_client *client = to_i2c_client(dev);
575 	struct adv748x_state *state = i2c_get_clientdata(client);
576 
577 	return adv748x_reset(state);
578 }
579 
580 /* -----------------------------------------------------------------------------
581  * i2c driver
582  */
583 
584 void adv748x_subdev_init(struct v4l2_subdev *sd, struct adv748x_state *state,
585 			 const struct v4l2_subdev_ops *ops, u32 function,
586 			 const char *ident)
587 {
588 	v4l2_subdev_init(sd, ops);
589 	sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
590 
591 	/* the owner is the same as the i2c_client's driver owner */
592 	sd->owner = state->dev->driver->owner;
593 	sd->dev = state->dev;
594 
595 	v4l2_set_subdevdata(sd, state);
596 
597 	/* initialize name */
598 	snprintf(sd->name, sizeof(sd->name), "%s %d-%04x %s",
599 		state->dev->driver->name,
600 		i2c_adapter_id(state->client->adapter),
601 		state->client->addr, ident);
602 
603 	sd->entity.function = function;
604 	sd->entity.ops = is_tx(adv748x_sd_to_csi2(sd)) ?
605 			 &adv748x_tx_media_ops : &adv748x_media_ops;
606 }
607 
608 static int adv748x_parse_csi2_lanes(struct adv748x_state *state,
609 				    unsigned int port,
610 				    struct device_node *ep)
611 {
612 	struct v4l2_fwnode_endpoint vep = { .bus_type = V4L2_MBUS_CSI2_DPHY };
613 	unsigned int num_lanes;
614 	int ret;
615 
616 	if (port != ADV748X_PORT_TXA && port != ADV748X_PORT_TXB)
617 		return 0;
618 
619 	ret = v4l2_fwnode_endpoint_parse(of_fwnode_handle(ep), &vep);
620 	if (ret)
621 		return ret;
622 
623 	num_lanes = vep.bus.mipi_csi2.num_data_lanes;
624 
625 	if (vep.base.port == ADV748X_PORT_TXA) {
626 		if (num_lanes != 1 && num_lanes != 2 && num_lanes != 4) {
627 			adv_err(state, "TXA: Invalid number (%u) of lanes\n",
628 				num_lanes);
629 			return -EINVAL;
630 		}
631 
632 		state->txa.num_lanes = num_lanes;
633 		state->txa.active_lanes = num_lanes;
634 		adv_dbg(state, "TXA: using %u lanes\n", state->txa.num_lanes);
635 	}
636 
637 	if (vep.base.port == ADV748X_PORT_TXB) {
638 		if (num_lanes != 1) {
639 			adv_err(state, "TXB: Invalid number (%u) of lanes\n",
640 				num_lanes);
641 			return -EINVAL;
642 		}
643 
644 		state->txb.num_lanes = num_lanes;
645 		state->txb.active_lanes = num_lanes;
646 		adv_dbg(state, "TXB: using %u lanes\n", state->txb.num_lanes);
647 	}
648 
649 	return 0;
650 }
651 
652 static int adv748x_parse_dt(struct adv748x_state *state)
653 {
654 	struct device_node *ep_np = NULL;
655 	struct of_endpoint ep;
656 	bool out_found = false;
657 	bool in_found = false;
658 	int ret;
659 
660 	for_each_endpoint_of_node(state->dev->of_node, ep_np) {
661 		of_graph_parse_endpoint(ep_np, &ep);
662 		adv_info(state, "Endpoint %pOF on port %d", ep.local_node,
663 			 ep.port);
664 
665 		if (ep.port >= ADV748X_PORT_MAX) {
666 			adv_err(state, "Invalid endpoint %pOF on port %d",
667 				ep.local_node, ep.port);
668 
669 			continue;
670 		}
671 
672 		if (state->endpoints[ep.port]) {
673 			adv_err(state,
674 				"Multiple port endpoints are not supported");
675 			continue;
676 		}
677 
678 		of_node_get(ep_np);
679 		state->endpoints[ep.port] = ep_np;
680 
681 		/*
682 		 * At least one input endpoint and one output endpoint shall
683 		 * be defined.
684 		 */
685 		if (ep.port < ADV748X_PORT_TXA)
686 			in_found = true;
687 		else
688 			out_found = true;
689 
690 		/* Store number of CSI-2 lanes used for TXA and TXB. */
691 		ret = adv748x_parse_csi2_lanes(state, ep.port, ep_np);
692 		if (ret)
693 			return ret;
694 	}
695 
696 	return in_found && out_found ? 0 : -ENODEV;
697 }
698 
699 static void adv748x_dt_cleanup(struct adv748x_state *state)
700 {
701 	unsigned int i;
702 
703 	for (i = 0; i < ADV748X_PORT_MAX; i++)
704 		of_node_put(state->endpoints[i]);
705 }
706 
707 static int adv748x_probe(struct i2c_client *client)
708 {
709 	struct adv748x_state *state;
710 	int ret;
711 
712 	/* Check if the adapter supports the needed features */
713 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
714 		return -EIO;
715 
716 	state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL);
717 	if (!state)
718 		return -ENOMEM;
719 
720 	mutex_init(&state->mutex);
721 
722 	state->dev = &client->dev;
723 	state->client = client;
724 	state->i2c_clients[ADV748X_PAGE_IO] = client;
725 	i2c_set_clientdata(client, state);
726 
727 	/*
728 	 * We can not use container_of to get back to the state with two TXs;
729 	 * Initialize the TXs's fields unconditionally on the endpoint
730 	 * presence to access them later.
731 	 */
732 	state->txa.state = state->txb.state = state;
733 	state->txa.page = ADV748X_PAGE_TXA;
734 	state->txb.page = ADV748X_PAGE_TXB;
735 	state->txa.port = ADV748X_PORT_TXA;
736 	state->txb.port = ADV748X_PORT_TXB;
737 
738 	/* Discover and process ports declared by the Device tree endpoints */
739 	ret = adv748x_parse_dt(state);
740 	if (ret) {
741 		adv_err(state, "Failed to parse device tree");
742 		goto err_free_mutex;
743 	}
744 
745 	/* Configure IO Regmap region */
746 	ret = adv748x_configure_regmap(state, ADV748X_PAGE_IO);
747 	if (ret) {
748 		adv_err(state, "Error configuring IO regmap region");
749 		goto err_cleanup_dt;
750 	}
751 
752 	ret = adv748x_identify_chip(state);
753 	if (ret) {
754 		adv_err(state, "Failed to identify chip");
755 		goto err_cleanup_dt;
756 	}
757 
758 	/* Configure remaining pages as I2C clients with regmap access */
759 	ret = adv748x_initialise_clients(state);
760 	if (ret) {
761 		adv_err(state, "Failed to setup client regmap pages");
762 		goto err_cleanup_clients;
763 	}
764 
765 	/* SW reset ADV748X to its default values */
766 	ret = adv748x_reset(state);
767 	if (ret) {
768 		adv_err(state, "Failed to reset hardware");
769 		goto err_cleanup_clients;
770 	}
771 
772 	/* Initialise HDMI */
773 	ret = adv748x_hdmi_init(&state->hdmi);
774 	if (ret) {
775 		adv_err(state, "Failed to probe HDMI");
776 		goto err_cleanup_clients;
777 	}
778 
779 	/* Initialise AFE */
780 	ret = adv748x_afe_init(&state->afe);
781 	if (ret) {
782 		adv_err(state, "Failed to probe AFE");
783 		goto err_cleanup_hdmi;
784 	}
785 
786 	/* Initialise TXA */
787 	ret = adv748x_csi2_init(state, &state->txa);
788 	if (ret) {
789 		adv_err(state, "Failed to probe TXA");
790 		goto err_cleanup_afe;
791 	}
792 
793 	/* Initialise TXB */
794 	ret = adv748x_csi2_init(state, &state->txb);
795 	if (ret) {
796 		adv_err(state, "Failed to probe TXB");
797 		goto err_cleanup_txa;
798 	}
799 
800 	return 0;
801 
802 err_cleanup_txa:
803 	adv748x_csi2_cleanup(&state->txa);
804 err_cleanup_afe:
805 	adv748x_afe_cleanup(&state->afe);
806 err_cleanup_hdmi:
807 	adv748x_hdmi_cleanup(&state->hdmi);
808 err_cleanup_clients:
809 	adv748x_unregister_clients(state);
810 err_cleanup_dt:
811 	adv748x_dt_cleanup(state);
812 err_free_mutex:
813 	mutex_destroy(&state->mutex);
814 
815 	return ret;
816 }
817 
818 static int adv748x_remove(struct i2c_client *client)
819 {
820 	struct adv748x_state *state = i2c_get_clientdata(client);
821 
822 	adv748x_afe_cleanup(&state->afe);
823 	adv748x_hdmi_cleanup(&state->hdmi);
824 
825 	adv748x_csi2_cleanup(&state->txa);
826 	adv748x_csi2_cleanup(&state->txb);
827 
828 	adv748x_unregister_clients(state);
829 	adv748x_dt_cleanup(state);
830 	mutex_destroy(&state->mutex);
831 
832 	return 0;
833 }
834 
835 static const struct of_device_id adv748x_of_table[] = {
836 	{ .compatible = "adi,adv7481", },
837 	{ .compatible = "adi,adv7482", },
838 	{ }
839 };
840 MODULE_DEVICE_TABLE(of, adv748x_of_table);
841 
842 static const struct dev_pm_ops adv748x_pm_ops = {
843 	SET_LATE_SYSTEM_SLEEP_PM_OPS(NULL, adv748x_resume_early)
844 };
845 
846 static struct i2c_driver adv748x_driver = {
847 	.driver = {
848 		.name = "adv748x",
849 		.of_match_table = adv748x_of_table,
850 		.pm = &adv748x_pm_ops,
851 	},
852 	.probe_new = adv748x_probe,
853 	.remove = adv748x_remove,
854 };
855 
856 module_i2c_driver(adv748x_driver);
857 
858 MODULE_AUTHOR("Kieran Bingham <kieran.bingham@ideasonboard.com>");
859 MODULE_DESCRIPTION("ADV748X video decoder");
860 MODULE_LICENSE("GPL");
861