1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Driver for the Texas Instruments DS90UB953 video serializer
4 *
5 * Based on a driver from Luca Ceresoli <luca@lucaceresoli.net>
6 *
7 * Copyright (c) 2019 Luca Ceresoli <luca@lucaceresoli.net>
8 * Copyright (c) 2023 Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
9 */
10
11#include <linux/clk-provider.h>
12#include <linux/clk.h>
13#include <linux/delay.h>
14#include <linux/fwnode.h>
15#include <linux/gpio/driver.h>
16#include <linux/i2c-atr.h>
17#include <linux/i2c.h>
18#include <linux/kernel.h>
19#include <linux/math64.h>
20#include <linux/module.h>
21#include <linux/property.h>
22#include <linux/rational.h>
23#include <linux/regmap.h>
24
25#include <media/i2c/ds90ub9xx.h>
26#include <media/v4l2-ctrls.h>
27#include <media/v4l2-event.h>
28#include <media/v4l2-fwnode.h>
29#include <media/v4l2-mediabus.h>
30#include <media/v4l2-subdev.h>
31
32#define UB953_PAD_SINK 0
33#define UB953_PAD_SOURCE 1
34
35#define UB953_NUM_GPIOS 4
36
37#define UB953_DEFAULT_CLKOUT_RATE 25000000UL
38
39#define UB953_REG_RESET_CTL 0x01
40#define UB953_REG_RESET_CTL_DIGITAL_RESET_1 BIT(1)
41#define UB953_REG_RESET_CTL_DIGITAL_RESET_0 BIT(0)
42
43#define UB953_REG_GENERAL_CFG 0x02
44#define UB953_REG_GENERAL_CFG_CONT_CLK BIT(6)
45#define UB953_REG_GENERAL_CFG_CSI_LANE_SEL_SHIFT 4
46#define UB953_REG_GENERAL_CFG_CSI_LANE_SEL_MASK GENMASK(5, 4)
47#define UB953_REG_GENERAL_CFG_CRC_TX_GEN_ENABLE BIT(1)
48#define UB953_REG_GENERAL_CFG_I2C_STRAP_MODE BIT(0)
49
50#define UB953_REG_MODE_SEL 0x03
51#define UB953_REG_MODE_SEL_MODE_DONE BIT(3)
52#define UB953_REG_MODE_SEL_MODE_OVERRIDE BIT(4)
53#define UB953_REG_MODE_SEL_MODE_MASK GENMASK(2, 0)
54
55#define UB953_REG_CLKOUT_CTRL0 0x06
56#define UB953_REG_CLKOUT_CTRL1 0x07
57
58#define UB953_REG_SCL_HIGH_TIME 0x0b
59#define UB953_REG_SCL_LOW_TIME 0x0c
60
61#define UB953_REG_LOCAL_GPIO_DATA 0x0d
62#define UB953_REG_LOCAL_GPIO_DATA_GPIO_RMTEN(n) BIT(4 + (n))
63#define UB953_REG_LOCAL_GPIO_DATA_GPIO_OUT_SRC(n) BIT(0 + (n))
64
65#define UB953_REG_GPIO_INPUT_CTRL 0x0e
66#define UB953_REG_GPIO_INPUT_CTRL_OUT_EN(n) BIT(4 + (n))
67#define UB953_REG_GPIO_INPUT_CTRL_INPUT_EN(n) BIT(0 + (n))
68
69#define UB953_REG_REV_MASK_ID 0x50
70#define UB953_REG_GENERAL_STATUS 0x52
71
72#define UB953_REG_GPIO_PIN_STS 0x53
73#define UB953_REG_GPIO_PIN_STS_GPIO_STS(n) BIT(0 + (n))
74
75#define UB953_REG_BIST_ERR_CNT 0x54
76#define UB953_REG_CRC_ERR_CNT1 0x55
77#define UB953_REG_CRC_ERR_CNT2 0x56
78
79#define UB953_REG_CSI_ERR_CNT 0x5c
80#define UB953_REG_CSI_ERR_STATUS 0x5d
81#define UB953_REG_CSI_ERR_DLANE01 0x5e
82#define UB953_REG_CSI_ERR_DLANE23 0x5f
83#define UB953_REG_CSI_ERR_CLK_LANE 0x60
84#define UB953_REG_CSI_PKT_HDR_VC_ID 0x61
85#define UB953_REG_PKT_HDR_WC_LSB 0x62
86#define UB953_REG_PKT_HDR_WC_MSB 0x63
87#define UB953_REG_CSI_ECC 0x64
88
89#define UB953_REG_IND_ACC_CTL 0xb0
90#define UB953_REG_IND_ACC_ADDR 0xb1
91#define UB953_REG_IND_ACC_DATA 0xb2
92
93#define UB953_REG_FPD3_RX_ID(n) (0xf0 + (n))
94#define UB953_REG_FPD3_RX_ID_LEN 6
95
96/* Indirect register blocks */
97#define UB953_IND_TARGET_PAT_GEN 0x00
98#define UB953_IND_TARGET_FPD3_TX 0x01
99#define UB953_IND_TARGET_DIE_ID 0x02
100
101#define UB953_IND_PGEN_CTL 0x01
102#define UB953_IND_PGEN_CTL_PGEN_ENABLE BIT(0)
103#define UB953_IND_PGEN_CFG 0x02
104#define UB953_IND_PGEN_CSI_DI 0x03
105#define UB953_IND_PGEN_LINE_SIZE1 0x04
106#define UB953_IND_PGEN_LINE_SIZE0 0x05
107#define UB953_IND_PGEN_BAR_SIZE1 0x06
108#define UB953_IND_PGEN_BAR_SIZE0 0x07
109#define UB953_IND_PGEN_ACT_LPF1 0x08
110#define UB953_IND_PGEN_ACT_LPF0 0x09
111#define UB953_IND_PGEN_TOT_LPF1 0x0a
112#define UB953_IND_PGEN_TOT_LPF0 0x0b
113#define UB953_IND_PGEN_LINE_PD1 0x0c
114#define UB953_IND_PGEN_LINE_PD0 0x0d
115#define UB953_IND_PGEN_VBP 0x0e
116#define UB953_IND_PGEN_VFP 0x0f
117#define UB953_IND_PGEN_COLOR(n) (0x10 + (n)) /* n <= 15 */
118
119/* Note: Only sync mode supported for now */
120enum ub953_mode {
121 /* FPD-Link III CSI-2 synchronous mode */
122 UB953_MODE_SYNC,
123 /* FPD-Link III CSI-2 non-synchronous mode, external ref clock */
124 UB953_MODE_NONSYNC_EXT,
125 /* FPD-Link III CSI-2 non-synchronous mode, internal ref clock */
126 UB953_MODE_NONSYNC_INT,
127 /* FPD-Link III DVP mode */
128 UB953_MODE_DVP,
129};
130
131struct ub953_hw_data {
132 const char *model;
133 bool is_ub971;
134};
135
136struct ub953_clkout_data {
137 u32 hs_div;
138 u32 m;
139 u32 n;
140 unsigned long rate;
141};
142
143struct ub953_data {
144 const struct ub953_hw_data *hw_data;
145
146 struct i2c_client *client;
147 struct regmap *regmap;
148 struct clk *clkin;
149
150 u32 num_data_lanes;
151 bool non_continous_clk;
152
153 struct gpio_chip gpio_chip;
154
155 struct v4l2_subdev sd;
156 struct media_pad pads[2];
157
158 struct v4l2_async_notifier notifier;
159
160 struct v4l2_subdev *source_sd;
161 u16 source_sd_pad;
162
163 u64 enabled_source_streams;
164
165 /* lock for register access */
166 struct mutex reg_lock;
167
168 u8 current_indirect_target;
169
170 struct clk_hw clkout_clk_hw;
171
172 enum ub953_mode mode;
173
174 const struct ds90ub9xx_platform_data *plat_data;
175};
176
177static inline struct ub953_data *sd_to_ub953(struct v4l2_subdev *sd)
178{
179 return container_of(sd, struct ub953_data, sd);
180}
181
182/*
183 * HW Access
184 */
185
186static int ub953_read(struct ub953_data *priv, u8 reg, u8 *val)
187{
188 unsigned int v;
189 int ret;
190
191 mutex_lock(&priv->reg_lock);
192
193 ret = regmap_read(map: priv->regmap, reg, val: &v);
194 if (ret) {
195 dev_err(&priv->client->dev, "Cannot read register 0x%02x: %d\n",
196 reg, ret);
197 goto out_unlock;
198 }
199
200 *val = v;
201
202out_unlock:
203 mutex_unlock(lock: &priv->reg_lock);
204
205 return ret;
206}
207
208static int ub953_write(struct ub953_data *priv, u8 reg, u8 val)
209{
210 int ret;
211
212 mutex_lock(&priv->reg_lock);
213
214 ret = regmap_write(map: priv->regmap, reg, val);
215 if (ret)
216 dev_err(&priv->client->dev,
217 "Cannot write register 0x%02x: %d\n", reg, ret);
218
219 mutex_unlock(lock: &priv->reg_lock);
220
221 return ret;
222}
223
224static int ub953_select_ind_reg_block(struct ub953_data *priv, u8 block)
225{
226 struct device *dev = &priv->client->dev;
227 int ret;
228
229 if (priv->current_indirect_target == block)
230 return 0;
231
232 ret = regmap_write(map: priv->regmap, UB953_REG_IND_ACC_CTL, val: block << 2);
233 if (ret) {
234 dev_err(dev, "%s: cannot select indirect target %u (%d)\n",
235 __func__, block, ret);
236 return ret;
237 }
238
239 priv->current_indirect_target = block;
240
241 return 0;
242}
243
244__maybe_unused
245static int ub953_read_ind(struct ub953_data *priv, u8 block, u8 reg, u8 *val)
246{
247 unsigned int v;
248 int ret;
249
250 mutex_lock(&priv->reg_lock);
251
252 ret = ub953_select_ind_reg_block(priv, block);
253 if (ret)
254 goto out_unlock;
255
256 ret = regmap_write(map: priv->regmap, UB953_REG_IND_ACC_ADDR, val: reg);
257 if (ret) {
258 dev_err(&priv->client->dev,
259 "Write to IND_ACC_ADDR failed when reading %u:%x02x: %d\n",
260 block, reg, ret);
261 goto out_unlock;
262 }
263
264 ret = regmap_read(map: priv->regmap, UB953_REG_IND_ACC_DATA, val: &v);
265 if (ret) {
266 dev_err(&priv->client->dev,
267 "Write to IND_ACC_DATA failed when reading %u:%x02x: %d\n",
268 block, reg, ret);
269 goto out_unlock;
270 }
271
272 *val = v;
273
274out_unlock:
275 mutex_unlock(lock: &priv->reg_lock);
276
277 return ret;
278}
279
280__maybe_unused
281static int ub953_write_ind(struct ub953_data *priv, u8 block, u8 reg, u8 val)
282{
283 int ret;
284
285 mutex_lock(&priv->reg_lock);
286
287 ret = ub953_select_ind_reg_block(priv, block);
288 if (ret)
289 goto out_unlock;
290
291 ret = regmap_write(map: priv->regmap, UB953_REG_IND_ACC_ADDR, val: reg);
292 if (ret) {
293 dev_err(&priv->client->dev,
294 "Write to IND_ACC_ADDR failed when writing %u:%x02x: %d\n",
295 block, reg, ret);
296 goto out_unlock;
297 }
298
299 ret = regmap_write(map: priv->regmap, UB953_REG_IND_ACC_DATA, val);
300 if (ret) {
301 dev_err(&priv->client->dev,
302 "Write to IND_ACC_DATA failed when writing %u:%x02x\n: %d\n",
303 block, reg, ret);
304 }
305
306out_unlock:
307 mutex_unlock(lock: &priv->reg_lock);
308
309 return ret;
310}
311
312/*
313 * GPIO chip
314 */
315static int ub953_gpio_get_direction(struct gpio_chip *gc, unsigned int offset)
316{
317 struct ub953_data *priv = gpiochip_get_data(gc);
318 int ret;
319 u8 v;
320
321 ret = ub953_read(priv, UB953_REG_GPIO_INPUT_CTRL, val: &v);
322 if (ret)
323 return ret;
324
325 if (v & UB953_REG_GPIO_INPUT_CTRL_INPUT_EN(offset))
326 return GPIO_LINE_DIRECTION_IN;
327 else
328 return GPIO_LINE_DIRECTION_OUT;
329}
330
331static int ub953_gpio_direction_in(struct gpio_chip *gc, unsigned int offset)
332{
333 struct ub953_data *priv = gpiochip_get_data(gc);
334
335 return regmap_update_bits(map: priv->regmap, UB953_REG_GPIO_INPUT_CTRL,
336 UB953_REG_GPIO_INPUT_CTRL_INPUT_EN(offset) |
337 UB953_REG_GPIO_INPUT_CTRL_OUT_EN(offset),
338 UB953_REG_GPIO_INPUT_CTRL_INPUT_EN(offset));
339}
340
341static int ub953_gpio_direction_out(struct gpio_chip *gc, unsigned int offset,
342 int value)
343{
344 struct ub953_data *priv = gpiochip_get_data(gc);
345 int ret;
346
347 ret = regmap_update_bits(map: priv->regmap, UB953_REG_LOCAL_GPIO_DATA,
348 UB953_REG_LOCAL_GPIO_DATA_GPIO_OUT_SRC(offset),
349 val: value ? UB953_REG_LOCAL_GPIO_DATA_GPIO_OUT_SRC(offset) :
350 0);
351
352 if (ret)
353 return ret;
354
355 return regmap_update_bits(map: priv->regmap, UB953_REG_GPIO_INPUT_CTRL,
356 UB953_REG_GPIO_INPUT_CTRL_INPUT_EN(offset) |
357 UB953_REG_GPIO_INPUT_CTRL_OUT_EN(offset),
358 UB953_REG_GPIO_INPUT_CTRL_OUT_EN(offset));
359}
360
361static int ub953_gpio_get(struct gpio_chip *gc, unsigned int offset)
362{
363 struct ub953_data *priv = gpiochip_get_data(gc);
364 int ret;
365 u8 v;
366
367 ret = ub953_read(priv, UB953_REG_GPIO_PIN_STS, val: &v);
368 if (ret)
369 return ret;
370
371 return !!(v & UB953_REG_GPIO_PIN_STS_GPIO_STS(offset));
372}
373
374static void ub953_gpio_set(struct gpio_chip *gc, unsigned int offset, int value)
375{
376 struct ub953_data *priv = gpiochip_get_data(gc);
377
378 regmap_update_bits(map: priv->regmap, UB953_REG_LOCAL_GPIO_DATA,
379 UB953_REG_LOCAL_GPIO_DATA_GPIO_OUT_SRC(offset),
380 val: value ? UB953_REG_LOCAL_GPIO_DATA_GPIO_OUT_SRC(offset) :
381 0);
382}
383
384static int ub953_gpio_of_xlate(struct gpio_chip *gc,
385 const struct of_phandle_args *gpiospec,
386 u32 *flags)
387{
388 if (flags)
389 *flags = gpiospec->args[1];
390
391 return gpiospec->args[0];
392}
393
394static int ub953_gpiochip_probe(struct ub953_data *priv)
395{
396 struct device *dev = &priv->client->dev;
397 struct gpio_chip *gc = &priv->gpio_chip;
398 int ret;
399
400 /* Set all GPIOs to local input mode */
401 ub953_write(priv, UB953_REG_LOCAL_GPIO_DATA, val: 0);
402 ub953_write(priv, UB953_REG_GPIO_INPUT_CTRL, val: 0xf);
403
404 gc->label = dev_name(dev);
405 gc->parent = dev;
406 gc->owner = THIS_MODULE;
407 gc->base = -1;
408 gc->can_sleep = true;
409 gc->ngpio = UB953_NUM_GPIOS;
410 gc->get_direction = ub953_gpio_get_direction;
411 gc->direction_input = ub953_gpio_direction_in;
412 gc->direction_output = ub953_gpio_direction_out;
413 gc->get = ub953_gpio_get;
414 gc->set = ub953_gpio_set;
415 gc->of_xlate = ub953_gpio_of_xlate;
416 gc->of_gpio_n_cells = 2;
417
418 ret = gpiochip_add_data(gc, priv);
419 if (ret) {
420 dev_err(dev, "Failed to add GPIOs: %d\n", ret);
421 return ret;
422 }
423
424 return 0;
425}
426
427static void ub953_gpiochip_remove(struct ub953_data *priv)
428{
429 gpiochip_remove(gc: &priv->gpio_chip);
430}
431
432/*
433 * V4L2
434 */
435
436static int _ub953_set_routing(struct v4l2_subdev *sd,
437 struct v4l2_subdev_state *state,
438 struct v4l2_subdev_krouting *routing)
439{
440 static const struct v4l2_mbus_framefmt format = {
441 .width = 640,
442 .height = 480,
443 .code = MEDIA_BUS_FMT_UYVY8_1X16,
444 .field = V4L2_FIELD_NONE,
445 .colorspace = V4L2_COLORSPACE_SRGB,
446 .ycbcr_enc = V4L2_YCBCR_ENC_601,
447 .quantization = V4L2_QUANTIZATION_LIM_RANGE,
448 .xfer_func = V4L2_XFER_FUNC_SRGB,
449 };
450 int ret;
451
452 /*
453 * Note: we can only support up to V4L2_FRAME_DESC_ENTRY_MAX, until
454 * frame desc is made dynamically allocated.
455 */
456
457 if (routing->num_routes > V4L2_FRAME_DESC_ENTRY_MAX)
458 return -EINVAL;
459
460 ret = v4l2_subdev_routing_validate(sd, routing,
461 disallow: V4L2_SUBDEV_ROUTING_ONLY_1_TO_1);
462 if (ret)
463 return ret;
464
465 ret = v4l2_subdev_set_routing_with_fmt(sd, state, routing, fmt: &format);
466 if (ret)
467 return ret;
468
469 return 0;
470}
471
472static int ub953_set_routing(struct v4l2_subdev *sd,
473 struct v4l2_subdev_state *state,
474 enum v4l2_subdev_format_whence which,
475 struct v4l2_subdev_krouting *routing)
476{
477 struct ub953_data *priv = sd_to_ub953(sd);
478
479 if (which == V4L2_SUBDEV_FORMAT_ACTIVE && priv->enabled_source_streams)
480 return -EBUSY;
481
482 return _ub953_set_routing(sd, state, routing);
483}
484
485static int ub953_get_frame_desc(struct v4l2_subdev *sd, unsigned int pad,
486 struct v4l2_mbus_frame_desc *fd)
487{
488 struct ub953_data *priv = sd_to_ub953(sd);
489 struct v4l2_mbus_frame_desc source_fd;
490 struct v4l2_subdev_route *route;
491 struct v4l2_subdev_state *state;
492 int ret;
493
494 if (pad != UB953_PAD_SOURCE)
495 return -EINVAL;
496
497 ret = v4l2_subdev_call(priv->source_sd, pad, get_frame_desc,
498 priv->source_sd_pad, &source_fd);
499 if (ret)
500 return ret;
501
502 fd->type = V4L2_MBUS_FRAME_DESC_TYPE_CSI2;
503
504 state = v4l2_subdev_lock_and_get_active_state(sd);
505
506 for_each_active_route(&state->routing, route) {
507 struct v4l2_mbus_frame_desc_entry *source_entry = NULL;
508 unsigned int i;
509
510 if (route->source_pad != pad)
511 continue;
512
513 for (i = 0; i < source_fd.num_entries; i++) {
514 if (source_fd.entry[i].stream == route->sink_stream) {
515 source_entry = &source_fd.entry[i];
516 break;
517 }
518 }
519
520 if (!source_entry) {
521 dev_err(&priv->client->dev,
522 "Failed to find stream from source frame desc\n");
523 ret = -EPIPE;
524 goto out_unlock;
525 }
526
527 fd->entry[fd->num_entries].stream = route->source_stream;
528 fd->entry[fd->num_entries].flags = source_entry->flags;
529 fd->entry[fd->num_entries].length = source_entry->length;
530 fd->entry[fd->num_entries].pixelcode = source_entry->pixelcode;
531 fd->entry[fd->num_entries].bus.csi2.vc =
532 source_entry->bus.csi2.vc;
533 fd->entry[fd->num_entries].bus.csi2.dt =
534 source_entry->bus.csi2.dt;
535
536 fd->num_entries++;
537 }
538
539out_unlock:
540 v4l2_subdev_unlock_state(state);
541
542 return ret;
543}
544
545static int ub953_set_fmt(struct v4l2_subdev *sd,
546 struct v4l2_subdev_state *state,
547 struct v4l2_subdev_format *format)
548{
549 struct ub953_data *priv = sd_to_ub953(sd);
550 struct v4l2_mbus_framefmt *fmt;
551
552 if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE &&
553 priv->enabled_source_streams)
554 return -EBUSY;
555
556 /* No transcoding, source and sink formats must match. */
557 if (format->pad == UB953_PAD_SOURCE)
558 return v4l2_subdev_get_fmt(sd, state, format);
559
560 /* Set sink format */
561 fmt = v4l2_subdev_state_get_format(state, format->pad, format->stream);
562 if (!fmt)
563 return -EINVAL;
564
565 *fmt = format->format;
566
567 /* Propagate to source format */
568 fmt = v4l2_subdev_state_get_opposite_stream_format(state, pad: format->pad,
569 stream: format->stream);
570 if (!fmt)
571 return -EINVAL;
572
573 *fmt = format->format;
574
575 return 0;
576}
577
578static int ub953_init_state(struct v4l2_subdev *sd,
579 struct v4l2_subdev_state *state)
580{
581 struct v4l2_subdev_route routes[] = {
582 {
583 .sink_pad = UB953_PAD_SINK,
584 .sink_stream = 0,
585 .source_pad = UB953_PAD_SOURCE,
586 .source_stream = 0,
587 .flags = V4L2_SUBDEV_ROUTE_FL_ACTIVE,
588 },
589 };
590
591 struct v4l2_subdev_krouting routing = {
592 .num_routes = ARRAY_SIZE(routes),
593 .routes = routes,
594 };
595
596 return _ub953_set_routing(sd, state, routing: &routing);
597}
598
599static int ub953_log_status(struct v4l2_subdev *sd)
600{
601 struct ub953_data *priv = sd_to_ub953(sd);
602 struct device *dev = &priv->client->dev;
603 u8 v = 0, v1 = 0, v2 = 0;
604 unsigned int i;
605 char id[UB953_REG_FPD3_RX_ID_LEN];
606 u8 gpio_local_data = 0;
607 u8 gpio_input_ctrl = 0;
608 u8 gpio_pin_sts = 0;
609
610 for (i = 0; i < sizeof(id); i++)
611 ub953_read(priv, UB953_REG_FPD3_RX_ID(i), val: &id[i]);
612
613 dev_info(dev, "ID '%.*s'\n", (int)sizeof(id), id);
614
615 ub953_read(priv, UB953_REG_GENERAL_STATUS, val: &v);
616 dev_info(dev, "GENERAL_STATUS %#02x\n", v);
617
618 ub953_read(priv, UB953_REG_CRC_ERR_CNT1, val: &v1);
619 ub953_read(priv, UB953_REG_CRC_ERR_CNT2, val: &v2);
620 dev_info(dev, "CRC error count %u\n", v1 | (v2 << 8));
621
622 ub953_read(priv, UB953_REG_CSI_ERR_CNT, val: &v);
623 dev_info(dev, "CSI error count %u\n", v);
624
625 ub953_read(priv, UB953_REG_CSI_ERR_STATUS, val: &v);
626 dev_info(dev, "CSI_ERR_STATUS %#02x\n", v);
627
628 ub953_read(priv, UB953_REG_CSI_ERR_DLANE01, val: &v);
629 dev_info(dev, "CSI_ERR_DLANE01 %#02x\n", v);
630
631 ub953_read(priv, UB953_REG_CSI_ERR_DLANE23, val: &v);
632 dev_info(dev, "CSI_ERR_DLANE23 %#02x\n", v);
633
634 ub953_read(priv, UB953_REG_CSI_ERR_CLK_LANE, val: &v);
635 dev_info(dev, "CSI_ERR_CLK_LANE %#02x\n", v);
636
637 ub953_read(priv, UB953_REG_CSI_PKT_HDR_VC_ID, val: &v);
638 dev_info(dev, "CSI packet header VC %u ID %u\n", v >> 6, v & 0x3f);
639
640 ub953_read(priv, UB953_REG_PKT_HDR_WC_LSB, val: &v1);
641 ub953_read(priv, UB953_REG_PKT_HDR_WC_MSB, val: &v2);
642 dev_info(dev, "CSI packet header WC %u\n", (v2 << 8) | v1);
643
644 ub953_read(priv, UB953_REG_CSI_ECC, val: &v);
645 dev_info(dev, "CSI ECC %#02x\n", v);
646
647 ub953_read(priv, UB953_REG_LOCAL_GPIO_DATA, val: &gpio_local_data);
648 ub953_read(priv, UB953_REG_GPIO_INPUT_CTRL, val: &gpio_input_ctrl);
649 ub953_read(priv, UB953_REG_GPIO_PIN_STS, val: &gpio_pin_sts);
650
651 for (i = 0; i < UB953_NUM_GPIOS; i++) {
652 dev_info(dev,
653 "GPIO%u: remote: %u is_input: %u is_output: %u val: %u sts: %u\n",
654 i,
655 !!(gpio_local_data & UB953_REG_LOCAL_GPIO_DATA_GPIO_RMTEN(i)),
656 !!(gpio_input_ctrl & UB953_REG_GPIO_INPUT_CTRL_INPUT_EN(i)),
657 !!(gpio_input_ctrl & UB953_REG_GPIO_INPUT_CTRL_OUT_EN(i)),
658 !!(gpio_local_data & UB953_REG_LOCAL_GPIO_DATA_GPIO_OUT_SRC(i)),
659 !!(gpio_pin_sts & UB953_REG_GPIO_PIN_STS_GPIO_STS(i)));
660 }
661
662 return 0;
663}
664
665static int ub953_enable_streams(struct v4l2_subdev *sd,
666 struct v4l2_subdev_state *state, u32 pad,
667 u64 streams_mask)
668{
669 struct ub953_data *priv = sd_to_ub953(sd);
670 u64 sink_streams;
671 int ret;
672
673 sink_streams = v4l2_subdev_state_xlate_streams(state, UB953_PAD_SOURCE,
674 UB953_PAD_SINK,
675 streams: &streams_mask);
676
677 ret = v4l2_subdev_enable_streams(sd: priv->source_sd, pad: priv->source_sd_pad,
678 streams_mask: sink_streams);
679 if (ret)
680 return ret;
681
682 priv->enabled_source_streams |= streams_mask;
683
684 return 0;
685}
686
687static int ub953_disable_streams(struct v4l2_subdev *sd,
688 struct v4l2_subdev_state *state, u32 pad,
689 u64 streams_mask)
690{
691 struct ub953_data *priv = sd_to_ub953(sd);
692 u64 sink_streams;
693 int ret;
694
695 sink_streams = v4l2_subdev_state_xlate_streams(state, UB953_PAD_SOURCE,
696 UB953_PAD_SINK,
697 streams: &streams_mask);
698
699 ret = v4l2_subdev_disable_streams(sd: priv->source_sd, pad: priv->source_sd_pad,
700 streams_mask: sink_streams);
701 if (ret)
702 return ret;
703
704 priv->enabled_source_streams &= ~streams_mask;
705
706 return 0;
707}
708
709static const struct v4l2_subdev_pad_ops ub953_pad_ops = {
710 .enable_streams = ub953_enable_streams,
711 .disable_streams = ub953_disable_streams,
712 .set_routing = ub953_set_routing,
713 .get_frame_desc = ub953_get_frame_desc,
714 .get_fmt = v4l2_subdev_get_fmt,
715 .set_fmt = ub953_set_fmt,
716};
717
718static const struct v4l2_subdev_core_ops ub953_subdev_core_ops = {
719 .log_status = ub953_log_status,
720 .subscribe_event = v4l2_ctrl_subdev_subscribe_event,
721 .unsubscribe_event = v4l2_event_subdev_unsubscribe,
722};
723
724static const struct v4l2_subdev_ops ub953_subdev_ops = {
725 .core = &ub953_subdev_core_ops,
726 .pad = &ub953_pad_ops,
727};
728
729static const struct v4l2_subdev_internal_ops ub953_internal_ops = {
730 .init_state = ub953_init_state,
731};
732
733static const struct media_entity_operations ub953_entity_ops = {
734 .link_validate = v4l2_subdev_link_validate,
735};
736
737static int ub953_notify_bound(struct v4l2_async_notifier *notifier,
738 struct v4l2_subdev *source_subdev,
739 struct v4l2_async_connection *asd)
740{
741 struct ub953_data *priv = sd_to_ub953(sd: notifier->sd);
742 struct device *dev = &priv->client->dev;
743 int ret;
744
745 ret = media_entity_get_fwnode_pad(entity: &source_subdev->entity,
746 fwnode: source_subdev->fwnode,
747 MEDIA_PAD_FL_SOURCE);
748 if (ret < 0) {
749 dev_err(dev, "Failed to find pad for %s\n",
750 source_subdev->name);
751 return ret;
752 }
753
754 priv->source_sd = source_subdev;
755 priv->source_sd_pad = ret;
756
757 ret = media_create_pad_link(source: &source_subdev->entity, source_pad: priv->source_sd_pad,
758 sink: &priv->sd.entity, sink_pad: 0,
759 MEDIA_LNK_FL_ENABLED |
760 MEDIA_LNK_FL_IMMUTABLE);
761 if (ret) {
762 dev_err(dev, "Unable to link %s:%u -> %s:0\n",
763 source_subdev->name, priv->source_sd_pad,
764 priv->sd.name);
765 return ret;
766 }
767
768 return 0;
769}
770
771static const struct v4l2_async_notifier_operations ub953_notify_ops = {
772 .bound = ub953_notify_bound,
773};
774
775static int ub953_v4l2_notifier_register(struct ub953_data *priv)
776{
777 struct device *dev = &priv->client->dev;
778 struct v4l2_async_connection *asd;
779 struct fwnode_handle *ep_fwnode;
780 int ret;
781
782 ep_fwnode = fwnode_graph_get_endpoint_by_id(dev_fwnode(dev),
783 UB953_PAD_SINK, endpoint: 0, flags: 0);
784 if (!ep_fwnode) {
785 dev_err(dev, "No graph endpoint\n");
786 return -ENODEV;
787 }
788
789 v4l2_async_subdev_nf_init(notifier: &priv->notifier, sd: &priv->sd);
790
791 asd = v4l2_async_nf_add_fwnode_remote(&priv->notifier, ep_fwnode,
792 struct v4l2_async_connection);
793
794 fwnode_handle_put(fwnode: ep_fwnode);
795
796 if (IS_ERR(ptr: asd)) {
797 dev_err(dev, "Failed to add subdev: %ld", PTR_ERR(asd));
798 v4l2_async_nf_cleanup(notifier: &priv->notifier);
799 return PTR_ERR(ptr: asd);
800 }
801
802 priv->notifier.ops = &ub953_notify_ops;
803
804 ret = v4l2_async_nf_register(notifier: &priv->notifier);
805 if (ret) {
806 dev_err(dev, "Failed to register subdev_notifier");
807 v4l2_async_nf_cleanup(notifier: &priv->notifier);
808 return ret;
809 }
810
811 return 0;
812}
813
814static void ub953_v4l2_notifier_unregister(struct ub953_data *priv)
815{
816 v4l2_async_nf_unregister(notifier: &priv->notifier);
817 v4l2_async_nf_cleanup(notifier: &priv->notifier);
818}
819
820/*
821 * Probing
822 */
823
824static int ub953_i2c_master_init(struct ub953_data *priv)
825{
826 /* i2c fast mode */
827 u32 ref = 26250000;
828 u32 scl_high = 915; /* ns */
829 u32 scl_low = 1641; /* ns */
830 int ret;
831
832 scl_high = div64_u64(dividend: (u64)scl_high * ref, divisor: 1000000000) - 5;
833 scl_low = div64_u64(dividend: (u64)scl_low * ref, divisor: 1000000000) - 5;
834
835 ret = ub953_write(priv, UB953_REG_SCL_HIGH_TIME, val: scl_high);
836 if (ret)
837 return ret;
838
839 ret = ub953_write(priv, UB953_REG_SCL_LOW_TIME, val: scl_low);
840 if (ret)
841 return ret;
842
843 return 0;
844}
845
846static u64 ub953_get_fc_rate(struct ub953_data *priv)
847{
848 switch (priv->mode) {
849 case UB953_MODE_SYNC:
850 if (priv->hw_data->is_ub971)
851 return priv->plat_data->bc_rate * 160ull;
852 else
853 return priv->plat_data->bc_rate / 2 * 160ull;
854
855 case UB953_MODE_NONSYNC_EXT:
856 /* CLKIN_DIV = 1 always */
857 return clk_get_rate(clk: priv->clkin) * 80ull;
858
859 default:
860 /* Not supported */
861 return 0;
862 }
863}
864
865static unsigned long ub953_calc_clkout_ub953(struct ub953_data *priv,
866 unsigned long target, u64 fc,
867 u8 *hs_div, u8 *m, u8 *n)
868{
869 /*
870 * We always use 4 as a pre-divider (HS_CLK_DIV = 2).
871 *
872 * According to the datasheet:
873 * - "HS_CLK_DIV typically should be set to either 16, 8, or 4 (default)."
874 * - "if it is not possible to have an integer ratio of N/M, it is best to
875 * select a smaller value for HS_CLK_DIV.
876 *
877 * For above reasons the default HS_CLK_DIV seems the best in the average
878 * case. Use always that value to keep the code simple.
879 */
880 static const unsigned long hs_clk_div = 4;
881
882 u64 fc_divided;
883 unsigned long mul, div;
884 unsigned long res;
885
886 /* clkout = fc / hs_clk_div * m / n */
887
888 fc_divided = div_u64(dividend: fc, divisor: hs_clk_div);
889
890 rational_best_approximation(given_numerator: target, given_denominator: fc_divided, max_numerator: (1 << 5) - 1,
891 max_denominator: (1 << 8) - 1, best_numerator: &mul, best_denominator: &div);
892
893 res = div_u64(dividend: fc_divided * mul, divisor: div);
894
895 *hs_div = hs_clk_div;
896 *m = mul;
897 *n = div;
898
899 return res;
900}
901
902static unsigned long ub953_calc_clkout_ub971(struct ub953_data *priv,
903 unsigned long target, u64 fc,
904 u8 *m, u8 *n)
905{
906 u64 fc_divided;
907 unsigned long mul, div;
908 unsigned long res;
909
910 /* clkout = fc * m / (8 * n) */
911
912 fc_divided = div_u64(dividend: fc, divisor: 8);
913
914 rational_best_approximation(given_numerator: target, given_denominator: fc_divided, max_numerator: (1 << 5) - 1,
915 max_denominator: (1 << 8) - 1, best_numerator: &mul, best_denominator: &div);
916
917 res = div_u64(dividend: fc_divided * mul, divisor: div);
918
919 *m = mul;
920 *n = div;
921
922 return res;
923}
924
925static void ub953_calc_clkout_params(struct ub953_data *priv,
926 unsigned long target_rate,
927 struct ub953_clkout_data *clkout_data)
928{
929 struct device *dev = &priv->client->dev;
930 unsigned long clkout_rate;
931 u64 fc_rate;
932
933 fc_rate = ub953_get_fc_rate(priv);
934
935 if (priv->hw_data->is_ub971) {
936 u8 m, n;
937
938 clkout_rate = ub953_calc_clkout_ub971(priv, target: target_rate,
939 fc: fc_rate, m: &m, n: &n);
940
941 clkout_data->m = m;
942 clkout_data->n = n;
943
944 dev_dbg(dev, "%s %llu * %u / (8 * %u) = %lu (requested %lu)",
945 __func__, fc_rate, m, n, clkout_rate, target_rate);
946 } else {
947 u8 hs_div, m, n;
948
949 clkout_rate = ub953_calc_clkout_ub953(priv, target: target_rate,
950 fc: fc_rate, hs_div: &hs_div, m: &m, n: &n);
951
952 clkout_data->hs_div = hs_div;
953 clkout_data->m = m;
954 clkout_data->n = n;
955
956 dev_dbg(dev, "%s %llu / %u * %u / %u = %lu (requested %lu)",
957 __func__, fc_rate, hs_div, m, n, clkout_rate,
958 target_rate);
959 }
960
961 clkout_data->rate = clkout_rate;
962}
963
964static void ub953_write_clkout_regs(struct ub953_data *priv,
965 const struct ub953_clkout_data *clkout_data)
966{
967 u8 clkout_ctrl0, clkout_ctrl1;
968
969 if (priv->hw_data->is_ub971)
970 clkout_ctrl0 = clkout_data->m;
971 else
972 clkout_ctrl0 = (__ffs(clkout_data->hs_div) << 5) |
973 clkout_data->m;
974
975 clkout_ctrl1 = clkout_data->n;
976
977 ub953_write(priv, UB953_REG_CLKOUT_CTRL0, val: clkout_ctrl0);
978 ub953_write(priv, UB953_REG_CLKOUT_CTRL1, val: clkout_ctrl1);
979}
980
981static unsigned long ub953_clkout_recalc_rate(struct clk_hw *hw,
982 unsigned long parent_rate)
983{
984 struct ub953_data *priv = container_of(hw, struct ub953_data, clkout_clk_hw);
985 struct device *dev = &priv->client->dev;
986 u8 ctrl0, ctrl1;
987 u32 mul, div;
988 u64 fc_rate;
989 u32 hs_clk_div;
990 u64 rate;
991 int ret;
992
993 ret = ub953_read(priv, UB953_REG_CLKOUT_CTRL0, val: &ctrl0);
994 if (ret) {
995 dev_err(dev, "Failed to read CLKOUT_CTRL0: %d\n", ret);
996 return 0;
997 }
998
999 ret = ub953_read(priv, UB953_REG_CLKOUT_CTRL1, val: &ctrl1);
1000 if (ret) {
1001 dev_err(dev, "Failed to read CLKOUT_CTRL1: %d\n", ret);
1002 return 0;
1003 }
1004
1005 fc_rate = ub953_get_fc_rate(priv);
1006
1007 if (priv->hw_data->is_ub971) {
1008 mul = ctrl0 & 0x1f;
1009 div = ctrl1;
1010
1011 if (div == 0)
1012 return 0;
1013
1014 rate = div_u64(dividend: fc_rate * mul, divisor: 8 * div);
1015
1016 dev_dbg(dev, "clkout: fc rate %llu, mul %u, div %u = %llu\n",
1017 fc_rate, mul, div, rate);
1018 } else {
1019 mul = ctrl0 & 0x1f;
1020 hs_clk_div = 1 << (ctrl0 >> 5);
1021 div = ctrl1;
1022
1023 if (div == 0)
1024 return 0;
1025
1026 rate = div_u64(dividend: div_u64(dividend: fc_rate, divisor: hs_clk_div) * mul, divisor: div);
1027
1028 dev_dbg(dev,
1029 "clkout: fc rate %llu, hs_clk_div %u, mul %u, div %u = %llu\n",
1030 fc_rate, hs_clk_div, mul, div, rate);
1031 }
1032
1033 return rate;
1034}
1035
1036static long ub953_clkout_round_rate(struct clk_hw *hw, unsigned long rate,
1037 unsigned long *parent_rate)
1038{
1039 struct ub953_data *priv = container_of(hw, struct ub953_data, clkout_clk_hw);
1040 struct ub953_clkout_data clkout_data;
1041
1042 ub953_calc_clkout_params(priv, target_rate: rate, clkout_data: &clkout_data);
1043
1044 return clkout_data.rate;
1045}
1046
1047static int ub953_clkout_set_rate(struct clk_hw *hw, unsigned long rate,
1048 unsigned long parent_rate)
1049{
1050 struct ub953_data *priv = container_of(hw, struct ub953_data, clkout_clk_hw);
1051 struct ub953_clkout_data clkout_data;
1052
1053 ub953_calc_clkout_params(priv, target_rate: rate, clkout_data: &clkout_data);
1054
1055 dev_dbg(&priv->client->dev, "%s %lu (requested %lu)\n", __func__,
1056 clkout_data.rate, rate);
1057
1058 ub953_write_clkout_regs(priv, clkout_data: &clkout_data);
1059
1060 return 0;
1061}
1062
1063static const struct clk_ops ub953_clkout_ops = {
1064 .recalc_rate = ub953_clkout_recalc_rate,
1065 .round_rate = ub953_clkout_round_rate,
1066 .set_rate = ub953_clkout_set_rate,
1067};
1068
1069static int ub953_register_clkout(struct ub953_data *priv)
1070{
1071 struct device *dev = &priv->client->dev;
1072 const struct clk_init_data init = {
1073 .name = kasprintf(GFP_KERNEL, fmt: "ds90%s.%s.clk_out",
1074 priv->hw_data->model, dev_name(dev)),
1075 .ops = &ub953_clkout_ops,
1076 };
1077 struct ub953_clkout_data clkout_data;
1078 int ret;
1079
1080 if (!init.name)
1081 return -ENOMEM;
1082
1083 /* Initialize clkout to 25MHz by default */
1084 ub953_calc_clkout_params(priv, UB953_DEFAULT_CLKOUT_RATE, clkout_data: &clkout_data);
1085 ub953_write_clkout_regs(priv, clkout_data: &clkout_data);
1086
1087 priv->clkout_clk_hw.init = &init;
1088
1089 ret = devm_clk_hw_register(dev, hw: &priv->clkout_clk_hw);
1090 kfree(objp: init.name);
1091 if (ret)
1092 return dev_err_probe(dev, err: ret, fmt: "Cannot register clock HW\n");
1093
1094 ret = devm_of_clk_add_hw_provider(dev, get: of_clk_hw_simple_get,
1095 data: &priv->clkout_clk_hw);
1096 if (ret)
1097 return dev_err_probe(dev, err: ret,
1098 fmt: "Cannot add OF clock provider\n");
1099
1100 return 0;
1101}
1102
1103static int ub953_add_i2c_adapter(struct ub953_data *priv)
1104{
1105 struct device *dev = &priv->client->dev;
1106 struct fwnode_handle *i2c_handle;
1107 int ret;
1108
1109 i2c_handle = device_get_named_child_node(dev, childname: "i2c");
1110 if (!i2c_handle)
1111 return 0;
1112
1113 ret = i2c_atr_add_adapter(atr: priv->plat_data->atr, chan_id: priv->plat_data->port,
1114 adapter_parent: dev, bus_handle: i2c_handle);
1115
1116 fwnode_handle_put(fwnode: i2c_handle);
1117
1118 if (ret)
1119 return ret;
1120
1121 return 0;
1122}
1123
1124static const struct regmap_config ub953_regmap_config = {
1125 .name = "ds90ub953",
1126 .reg_bits = 8,
1127 .val_bits = 8,
1128 .reg_format_endian = REGMAP_ENDIAN_DEFAULT,
1129 .val_format_endian = REGMAP_ENDIAN_DEFAULT,
1130};
1131
1132static int ub953_parse_dt(struct ub953_data *priv)
1133{
1134 struct device *dev = &priv->client->dev;
1135 struct v4l2_fwnode_endpoint vep = {
1136 .bus_type = V4L2_MBUS_CSI2_DPHY,
1137 };
1138 struct fwnode_handle *ep_fwnode;
1139 unsigned char nlanes;
1140 int ret;
1141
1142 ep_fwnode = fwnode_graph_get_endpoint_by_id(dev_fwnode(dev),
1143 UB953_PAD_SINK, endpoint: 0, flags: 0);
1144 if (!ep_fwnode)
1145 return dev_err_probe(dev, err: -ENOENT, fmt: "no endpoint found\n");
1146
1147 ret = v4l2_fwnode_endpoint_parse(fwnode: ep_fwnode, vep: &vep);
1148
1149 fwnode_handle_put(fwnode: ep_fwnode);
1150
1151 if (ret)
1152 return dev_err_probe(dev, err: ret,
1153 fmt: "failed to parse sink endpoint data\n");
1154
1155 nlanes = vep.bus.mipi_csi2.num_data_lanes;
1156 if (nlanes != 1 && nlanes != 2 && nlanes != 4)
1157 return dev_err_probe(dev, err: -EINVAL,
1158 fmt: "bad number of data-lanes: %u\n", nlanes);
1159
1160 priv->num_data_lanes = nlanes;
1161
1162 priv->non_continous_clk = vep.bus.mipi_csi2.flags &
1163 V4L2_MBUS_CSI2_NONCONTINUOUS_CLOCK;
1164
1165 return 0;
1166}
1167
1168static int ub953_hw_init(struct ub953_data *priv)
1169{
1170 struct device *dev = &priv->client->dev;
1171 bool mode_override;
1172 int ret;
1173 u8 v;
1174
1175 ret = ub953_read(priv, UB953_REG_MODE_SEL, val: &v);
1176 if (ret)
1177 return ret;
1178
1179 if (!(v & UB953_REG_MODE_SEL_MODE_DONE))
1180 return dev_err_probe(dev, err: -EIO, fmt: "Mode value not stabilized\n");
1181
1182 mode_override = v & UB953_REG_MODE_SEL_MODE_OVERRIDE;
1183
1184 switch (v & UB953_REG_MODE_SEL_MODE_MASK) {
1185 case 0:
1186 priv->mode = UB953_MODE_SYNC;
1187 break;
1188 case 2:
1189 priv->mode = UB953_MODE_NONSYNC_EXT;
1190 break;
1191 case 3:
1192 priv->mode = UB953_MODE_NONSYNC_INT;
1193 break;
1194 case 5:
1195 priv->mode = UB953_MODE_DVP;
1196 break;
1197 default:
1198 return dev_err_probe(dev, err: -EIO,
1199 fmt: "Invalid mode in mode register\n");
1200 }
1201
1202 dev_dbg(dev, "mode from %s: %#x\n", mode_override ? "reg" : "strap",
1203 priv->mode);
1204
1205 if (priv->mode != UB953_MODE_SYNC &&
1206 priv->mode != UB953_MODE_NONSYNC_EXT)
1207 return dev_err_probe(dev, err: -ENODEV,
1208 fmt: "Unsupported mode selected: %u\n",
1209 priv->mode);
1210
1211 if (priv->mode == UB953_MODE_NONSYNC_EXT && !priv->clkin)
1212 return dev_err_probe(dev, err: -EINVAL,
1213 fmt: "clkin required for non-sync ext mode\n");
1214
1215 ret = ub953_read(priv, UB953_REG_REV_MASK_ID, val: &v);
1216 if (ret)
1217 return dev_err_probe(dev, err: ret, fmt: "Failed to read revision");
1218
1219 dev_info(dev, "Found %s rev/mask %#04x\n", priv->hw_data->model, v);
1220
1221 ret = ub953_read(priv, UB953_REG_GENERAL_CFG, val: &v);
1222 if (ret)
1223 return ret;
1224
1225 dev_dbg(dev, "i2c strap setting %s V\n",
1226 (v & UB953_REG_GENERAL_CFG_I2C_STRAP_MODE) ? "1.8" : "3.3");
1227
1228 ret = ub953_i2c_master_init(priv);
1229 if (ret)
1230 return dev_err_probe(dev, err: ret, fmt: "i2c init failed\n");
1231
1232 ub953_write(priv, UB953_REG_GENERAL_CFG,
1233 val: (priv->non_continous_clk ? 0 : UB953_REG_GENERAL_CFG_CONT_CLK) |
1234 ((priv->num_data_lanes - 1) << UB953_REG_GENERAL_CFG_CSI_LANE_SEL_SHIFT) |
1235 UB953_REG_GENERAL_CFG_CRC_TX_GEN_ENABLE);
1236
1237 return 0;
1238}
1239
1240static int ub953_subdev_init(struct ub953_data *priv)
1241{
1242 struct device *dev = &priv->client->dev;
1243 int ret;
1244
1245 v4l2_i2c_subdev_init(sd: &priv->sd, client: priv->client, ops: &ub953_subdev_ops);
1246 priv->sd.internal_ops = &ub953_internal_ops;
1247
1248 priv->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE |
1249 V4L2_SUBDEV_FL_HAS_EVENTS | V4L2_SUBDEV_FL_STREAMS;
1250 priv->sd.entity.function = MEDIA_ENT_F_VID_IF_BRIDGE;
1251 priv->sd.entity.ops = &ub953_entity_ops;
1252
1253 priv->pads[0].flags = MEDIA_PAD_FL_SINK;
1254 priv->pads[1].flags = MEDIA_PAD_FL_SOURCE;
1255
1256 ret = media_entity_pads_init(entity: &priv->sd.entity, num_pads: 2, pads: priv->pads);
1257 if (ret)
1258 return dev_err_probe(dev, err: ret, fmt: "Failed to init pads\n");
1259
1260 ret = v4l2_subdev_init_finalize(&priv->sd);
1261 if (ret)
1262 goto err_entity_cleanup;
1263
1264 ret = ub953_v4l2_notifier_register(priv);
1265 if (ret) {
1266 dev_err_probe(dev, err: ret,
1267 fmt: "v4l2 subdev notifier register failed\n");
1268 goto err_free_state;
1269 }
1270
1271 ret = v4l2_async_register_subdev(sd: &priv->sd);
1272 if (ret) {
1273 dev_err_probe(dev, err: ret, fmt: "v4l2_async_register_subdev error\n");
1274 goto err_unreg_notif;
1275 }
1276
1277 return 0;
1278
1279err_unreg_notif:
1280 ub953_v4l2_notifier_unregister(priv);
1281err_free_state:
1282 v4l2_subdev_cleanup(sd: &priv->sd);
1283err_entity_cleanup:
1284 media_entity_cleanup(entity: &priv->sd.entity);
1285
1286 return ret;
1287}
1288
1289static void ub953_subdev_uninit(struct ub953_data *priv)
1290{
1291 v4l2_async_unregister_subdev(sd: &priv->sd);
1292 ub953_v4l2_notifier_unregister(priv);
1293 v4l2_subdev_cleanup(sd: &priv->sd);
1294 fwnode_handle_put(fwnode: priv->sd.fwnode);
1295 media_entity_cleanup(entity: &priv->sd.entity);
1296}
1297
1298static int ub953_probe(struct i2c_client *client)
1299{
1300 struct device *dev = &client->dev;
1301 struct ub953_data *priv;
1302 int ret;
1303
1304 priv = devm_kzalloc(dev, size: sizeof(*priv), GFP_KERNEL);
1305 if (!priv)
1306 return -ENOMEM;
1307
1308 priv->client = client;
1309
1310 priv->hw_data = device_get_match_data(dev);
1311
1312 priv->plat_data = dev_get_platdata(dev: &client->dev);
1313 if (!priv->plat_data)
1314 return dev_err_probe(dev, err: -ENODEV, fmt: "Platform data missing\n");
1315
1316 mutex_init(&priv->reg_lock);
1317
1318 /*
1319 * Initialize to invalid values so that the first reg writes will
1320 * configure the target.
1321 */
1322 priv->current_indirect_target = 0xff;
1323
1324 priv->regmap = devm_regmap_init_i2c(client, &ub953_regmap_config);
1325 if (IS_ERR(ptr: priv->regmap)) {
1326 ret = PTR_ERR(ptr: priv->regmap);
1327 dev_err_probe(dev, err: ret, fmt: "Failed to init regmap\n");
1328 goto err_mutex_destroy;
1329 }
1330
1331 priv->clkin = devm_clk_get_optional(dev, id: "clkin");
1332 if (IS_ERR(ptr: priv->clkin)) {
1333 ret = PTR_ERR(ptr: priv->clkin);
1334 dev_err_probe(dev, err: ret, fmt: "failed to parse 'clkin'\n");
1335 goto err_mutex_destroy;
1336 }
1337
1338 ret = ub953_parse_dt(priv);
1339 if (ret)
1340 goto err_mutex_destroy;
1341
1342 ret = ub953_hw_init(priv);
1343 if (ret)
1344 goto err_mutex_destroy;
1345
1346 ret = ub953_gpiochip_probe(priv);
1347 if (ret) {
1348 dev_err_probe(dev, err: ret, fmt: "Failed to init gpiochip\n");
1349 goto err_mutex_destroy;
1350 }
1351
1352 ret = ub953_register_clkout(priv);
1353 if (ret) {
1354 dev_err_probe(dev, err: ret, fmt: "Failed to register clkout\n");
1355 goto err_gpiochip_remove;
1356 }
1357
1358 ret = ub953_subdev_init(priv);
1359 if (ret)
1360 goto err_gpiochip_remove;
1361
1362 ret = ub953_add_i2c_adapter(priv);
1363 if (ret) {
1364 dev_err_probe(dev, err: ret, fmt: "failed to add remote i2c adapter\n");
1365 goto err_subdev_uninit;
1366 }
1367
1368 return 0;
1369
1370err_subdev_uninit:
1371 ub953_subdev_uninit(priv);
1372err_gpiochip_remove:
1373 ub953_gpiochip_remove(priv);
1374err_mutex_destroy:
1375 mutex_destroy(lock: &priv->reg_lock);
1376
1377 return ret;
1378}
1379
1380static void ub953_remove(struct i2c_client *client)
1381{
1382 struct v4l2_subdev *sd = i2c_get_clientdata(client);
1383 struct ub953_data *priv = sd_to_ub953(sd);
1384
1385 i2c_atr_del_adapter(atr: priv->plat_data->atr, chan_id: priv->plat_data->port);
1386
1387 ub953_subdev_uninit(priv);
1388
1389 ub953_gpiochip_remove(priv);
1390 mutex_destroy(lock: &priv->reg_lock);
1391}
1392
1393static const struct ub953_hw_data ds90ub953_hw = {
1394 .model = "ub953",
1395};
1396
1397static const struct ub953_hw_data ds90ub971_hw = {
1398 .model = "ub971",
1399 .is_ub971 = true,
1400};
1401
1402static const struct i2c_device_id ub953_id[] = {
1403 { "ds90ub953-q1", (kernel_ulong_t)&ds90ub953_hw },
1404 { "ds90ub971-q1", (kernel_ulong_t)&ds90ub971_hw },
1405 {}
1406};
1407MODULE_DEVICE_TABLE(i2c, ub953_id);
1408
1409static const struct of_device_id ub953_dt_ids[] = {
1410 { .compatible = "ti,ds90ub953-q1", .data = &ds90ub953_hw },
1411 { .compatible = "ti,ds90ub971-q1", .data = &ds90ub971_hw },
1412 {}
1413};
1414MODULE_DEVICE_TABLE(of, ub953_dt_ids);
1415
1416static struct i2c_driver ds90ub953_driver = {
1417 .probe = ub953_probe,
1418 .remove = ub953_remove,
1419 .id_table = ub953_id,
1420 .driver = {
1421 .name = "ds90ub953",
1422 .of_match_table = ub953_dt_ids,
1423 },
1424};
1425module_i2c_driver(ds90ub953_driver);
1426
1427MODULE_LICENSE("GPL");
1428MODULE_DESCRIPTION("Texas Instruments FPD-Link III/IV CSI-2 Serializers Driver");
1429MODULE_AUTHOR("Luca Ceresoli <luca@lucaceresoli.net>");
1430MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>");
1431MODULE_IMPORT_NS(I2C_ATR);
1432

source code of linux/drivers/media/i2c/ds90ub953.c