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15#include <linux/gpio/consumer.h>
16#include <linux/i2c-mux.h>
17#include <linux/i2c.h>
18#include <linux/module.h>
19#include <linux/regmap.h>
20
21#include <drm/drmP.h>
22#include <drm/drm_atomic_helper.h>
23#include <drm/drm_edid.h>
24#include <drm/drm_probe_helper.h>
25
26#define SII902X_TPI_VIDEO_DATA 0x0
27
28#define SII902X_TPI_PIXEL_REPETITION 0x8
29#define SII902X_TPI_AVI_PIXEL_REP_BUS_24BIT BIT(5)
30#define SII902X_TPI_AVI_PIXEL_REP_RISING_EDGE BIT(4)
31#define SII902X_TPI_AVI_PIXEL_REP_4X 3
32#define SII902X_TPI_AVI_PIXEL_REP_2X 1
33#define SII902X_TPI_AVI_PIXEL_REP_NONE 0
34#define SII902X_TPI_CLK_RATIO_HALF (0 << 6)
35#define SII902X_TPI_CLK_RATIO_1X (1 << 6)
36#define SII902X_TPI_CLK_RATIO_2X (2 << 6)
37#define SII902X_TPI_CLK_RATIO_4X (3 << 6)
38
39#define SII902X_TPI_AVI_IN_FORMAT 0x9
40#define SII902X_TPI_AVI_INPUT_BITMODE_12BIT BIT(7)
41#define SII902X_TPI_AVI_INPUT_DITHER BIT(6)
42#define SII902X_TPI_AVI_INPUT_RANGE_LIMITED (2 << 2)
43#define SII902X_TPI_AVI_INPUT_RANGE_FULL (1 << 2)
44#define SII902X_TPI_AVI_INPUT_RANGE_AUTO (0 << 2)
45#define SII902X_TPI_AVI_INPUT_COLORSPACE_BLACK (3 << 0)
46#define SII902X_TPI_AVI_INPUT_COLORSPACE_YUV422 (2 << 0)
47#define SII902X_TPI_AVI_INPUT_COLORSPACE_YUV444 (1 << 0)
48#define SII902X_TPI_AVI_INPUT_COLORSPACE_RGB (0 << 0)
49
50#define SII902X_TPI_AVI_INFOFRAME 0x0c
51
52#define SII902X_SYS_CTRL_DATA 0x1a
53#define SII902X_SYS_CTRL_PWR_DWN BIT(4)
54#define SII902X_SYS_CTRL_AV_MUTE BIT(3)
55#define SII902X_SYS_CTRL_DDC_BUS_REQ BIT(2)
56#define SII902X_SYS_CTRL_DDC_BUS_GRTD BIT(1)
57#define SII902X_SYS_CTRL_OUTPUT_MODE BIT(0)
58#define SII902X_SYS_CTRL_OUTPUT_HDMI 1
59#define SII902X_SYS_CTRL_OUTPUT_DVI 0
60
61#define SII902X_REG_CHIPID(n) (0x1b + (n))
62
63#define SII902X_PWR_STATE_CTRL 0x1e
64#define SII902X_AVI_POWER_STATE_MSK GENMASK(1, 0)
65#define SII902X_AVI_POWER_STATE_D(l) ((l) & SII902X_AVI_POWER_STATE_MSK)
66
67#define SII902X_INT_ENABLE 0x3c
68#define SII902X_INT_STATUS 0x3d
69#define SII902X_HOTPLUG_EVENT BIT(0)
70#define SII902X_PLUGGED_STATUS BIT(2)
71
72#define SII902X_REG_TPI_RQB 0xc7
73
74#define SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS 500
75
76struct sii902x {
77 struct i2c_client *i2c;
78 struct regmap *regmap;
79 struct drm_bridge bridge;
80 struct drm_connector connector;
81 struct gpio_desc *reset_gpio;
82 struct i2c_mux_core *i2cmux;
83};
84
85static int sii902x_read_unlocked(struct i2c_client *i2c, u8 reg, u8 *val)
86{
87 union i2c_smbus_data data;
88 int ret;
89
90 ret = __i2c_smbus_xfer(i2c->adapter, i2c->addr, i2c->flags,
91 I2C_SMBUS_READ, reg, I2C_SMBUS_BYTE_DATA, &data);
92
93 if (ret < 0)
94 return ret;
95
96 *val = data.byte;
97 return 0;
98}
99
100static int sii902x_write_unlocked(struct i2c_client *i2c, u8 reg, u8 val)
101{
102 union i2c_smbus_data data;
103
104 data.byte = val;
105
106 return __i2c_smbus_xfer(i2c->adapter, i2c->addr, i2c->flags,
107 I2C_SMBUS_WRITE, reg, I2C_SMBUS_BYTE_DATA,
108 &data);
109}
110
111static int sii902x_update_bits_unlocked(struct i2c_client *i2c, u8 reg, u8 mask,
112 u8 val)
113{
114 int ret;
115 u8 status;
116
117 ret = sii902x_read_unlocked(i2c, reg, &status);
118 if (ret)
119 return ret;
120 status &= ~mask;
121 status |= val & mask;
122 return sii902x_write_unlocked(i2c, reg, status);
123}
124
125static inline struct sii902x *bridge_to_sii902x(struct drm_bridge *bridge)
126{
127 return container_of(bridge, struct sii902x, bridge);
128}
129
130static inline struct sii902x *connector_to_sii902x(struct drm_connector *con)
131{
132 return container_of(con, struct sii902x, connector);
133}
134
135static void sii902x_reset(struct sii902x *sii902x)
136{
137 if (!sii902x->reset_gpio)
138 return;
139
140 gpiod_set_value(sii902x->reset_gpio, 1);
141
142
143 usleep_range(150, 200);
144
145 gpiod_set_value(sii902x->reset_gpio, 0);
146}
147
148static enum drm_connector_status
149sii902x_connector_detect(struct drm_connector *connector, bool force)
150{
151 struct sii902x *sii902x = connector_to_sii902x(connector);
152 unsigned int status;
153
154 regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);
155
156 return (status & SII902X_PLUGGED_STATUS) ?
157 connector_status_connected : connector_status_disconnected;
158}
159
160static const struct drm_connector_funcs sii902x_connector_funcs = {
161 .detect = sii902x_connector_detect,
162 .fill_modes = drm_helper_probe_single_connector_modes,
163 .destroy = drm_connector_cleanup,
164 .reset = drm_atomic_helper_connector_reset,
165 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
166 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
167};
168
169static int sii902x_get_modes(struct drm_connector *connector)
170{
171 struct sii902x *sii902x = connector_to_sii902x(connector);
172 u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
173 struct edid *edid;
174 int num = 0, ret;
175
176 edid = drm_get_edid(connector, sii902x->i2cmux->adapter[0]);
177 drm_connector_update_edid_property(connector, edid);
178 if (edid) {
179 num = drm_add_edid_modes(connector, edid);
180 kfree(edid);
181 }
182
183 ret = drm_display_info_set_bus_formats(&connector->display_info,
184 &bus_format, 1);
185 if (ret)
186 return ret;
187
188 return num;
189}
190
191static enum drm_mode_status sii902x_mode_valid(struct drm_connector *connector,
192 struct drm_display_mode *mode)
193{
194
195
196 return MODE_OK;
197}
198
199static const struct drm_connector_helper_funcs sii902x_connector_helper_funcs = {
200 .get_modes = sii902x_get_modes,
201 .mode_valid = sii902x_mode_valid,
202};
203
204static void sii902x_bridge_disable(struct drm_bridge *bridge)
205{
206 struct sii902x *sii902x = bridge_to_sii902x(bridge);
207
208 regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA,
209 SII902X_SYS_CTRL_PWR_DWN,
210 SII902X_SYS_CTRL_PWR_DWN);
211}
212
213static void sii902x_bridge_enable(struct drm_bridge *bridge)
214{
215 struct sii902x *sii902x = bridge_to_sii902x(bridge);
216
217 regmap_update_bits(sii902x->regmap, SII902X_PWR_STATE_CTRL,
218 SII902X_AVI_POWER_STATE_MSK,
219 SII902X_AVI_POWER_STATE_D(0));
220 regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA,
221 SII902X_SYS_CTRL_PWR_DWN, 0);
222}
223
224static void sii902x_bridge_mode_set(struct drm_bridge *bridge,
225 const struct drm_display_mode *mode,
226 const struct drm_display_mode *adj)
227{
228 struct sii902x *sii902x = bridge_to_sii902x(bridge);
229 struct regmap *regmap = sii902x->regmap;
230 u8 buf[HDMI_INFOFRAME_SIZE(AVI)];
231 struct hdmi_avi_infoframe frame;
232 int ret;
233
234 buf[0] = adj->clock;
235 buf[1] = adj->clock >> 8;
236 buf[2] = adj->vrefresh;
237 buf[3] = 0x00;
238 buf[4] = adj->hdisplay;
239 buf[5] = adj->hdisplay >> 8;
240 buf[6] = adj->vdisplay;
241 buf[7] = adj->vdisplay >> 8;
242 buf[8] = SII902X_TPI_CLK_RATIO_1X | SII902X_TPI_AVI_PIXEL_REP_NONE |
243 SII902X_TPI_AVI_PIXEL_REP_BUS_24BIT;
244 buf[9] = SII902X_TPI_AVI_INPUT_RANGE_AUTO |
245 SII902X_TPI_AVI_INPUT_COLORSPACE_RGB;
246
247 ret = regmap_bulk_write(regmap, SII902X_TPI_VIDEO_DATA, buf, 10);
248 if (ret)
249 return;
250
251 ret = drm_hdmi_avi_infoframe_from_display_mode(&frame,
252 &sii902x->connector, adj);
253 if (ret < 0) {
254 DRM_ERROR("couldn't fill AVI infoframe\n");
255 return;
256 }
257
258 ret = hdmi_avi_infoframe_pack(&frame, buf, sizeof(buf));
259 if (ret < 0) {
260 DRM_ERROR("failed to pack AVI infoframe: %d\n", ret);
261 return;
262 }
263
264
265 regmap_bulk_write(regmap, SII902X_TPI_AVI_INFOFRAME,
266 buf + HDMI_INFOFRAME_HEADER_SIZE - 1,
267 HDMI_AVI_INFOFRAME_SIZE + 1);
268}
269
270static int sii902x_bridge_attach(struct drm_bridge *bridge)
271{
272 struct sii902x *sii902x = bridge_to_sii902x(bridge);
273 struct drm_device *drm = bridge->dev;
274 int ret;
275
276 drm_connector_helper_add(&sii902x->connector,
277 &sii902x_connector_helper_funcs);
278
279 if (!drm_core_check_feature(drm, DRIVER_ATOMIC)) {
280 dev_err(&sii902x->i2c->dev,
281 "sii902x driver is only compatible with DRM devices supporting atomic updates\n");
282 return -ENOTSUPP;
283 }
284
285 ret = drm_connector_init(drm, &sii902x->connector,
286 &sii902x_connector_funcs,
287 DRM_MODE_CONNECTOR_HDMIA);
288 if (ret)
289 return ret;
290
291 if (sii902x->i2c->irq > 0)
292 sii902x->connector.polled = DRM_CONNECTOR_POLL_HPD;
293 else
294 sii902x->connector.polled = DRM_CONNECTOR_POLL_CONNECT;
295
296 drm_connector_attach_encoder(&sii902x->connector, bridge->encoder);
297
298 return 0;
299}
300
301static const struct drm_bridge_funcs sii902x_bridge_funcs = {
302 .attach = sii902x_bridge_attach,
303 .mode_set = sii902x_bridge_mode_set,
304 .disable = sii902x_bridge_disable,
305 .enable = sii902x_bridge_enable,
306};
307
308static const struct regmap_range sii902x_volatile_ranges[] = {
309 { .range_min = 0, .range_max = 0xff },
310};
311
312static const struct regmap_access_table sii902x_volatile_table = {
313 .yes_ranges = sii902x_volatile_ranges,
314 .n_yes_ranges = ARRAY_SIZE(sii902x_volatile_ranges),
315};
316
317static const struct regmap_config sii902x_regmap_config = {
318 .reg_bits = 8,
319 .val_bits = 8,
320 .volatile_table = &sii902x_volatile_table,
321 .cache_type = REGCACHE_NONE,
322};
323
324static irqreturn_t sii902x_interrupt(int irq, void *data)
325{
326 struct sii902x *sii902x = data;
327 unsigned int status = 0;
328
329 regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);
330 regmap_write(sii902x->regmap, SII902X_INT_STATUS, status);
331
332 if ((status & SII902X_HOTPLUG_EVENT) && sii902x->bridge.dev)
333 drm_helper_hpd_irq_event(sii902x->bridge.dev);
334
335 return IRQ_HANDLED;
336}
337
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348
349
350static int sii902x_i2c_bypass_select(struct i2c_mux_core *mux, u32 chan_id)
351{
352 struct sii902x *sii902x = i2c_mux_priv(mux);
353 struct device *dev = &sii902x->i2c->dev;
354 unsigned long timeout;
355 u8 status;
356 int ret;
357
358 ret = sii902x_update_bits_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
359 SII902X_SYS_CTRL_DDC_BUS_REQ,
360 SII902X_SYS_CTRL_DDC_BUS_REQ);
361 if (ret)
362 return ret;
363
364 timeout = jiffies +
365 msecs_to_jiffies(SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS);
366 do {
367 ret = sii902x_read_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
368 &status);
369 if (ret)
370 return ret;
371 } while (!(status & SII902X_SYS_CTRL_DDC_BUS_GRTD) &&
372 time_before(jiffies, timeout));
373
374 if (!(status & SII902X_SYS_CTRL_DDC_BUS_GRTD)) {
375 dev_err(dev, "Failed to acquire the i2c bus\n");
376 return -ETIMEDOUT;
377 }
378
379 return sii902x_write_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
380 status);
381}
382
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393
394
395static int sii902x_i2c_bypass_deselect(struct i2c_mux_core *mux, u32 chan_id)
396{
397 struct sii902x *sii902x = i2c_mux_priv(mux);
398 struct device *dev = &sii902x->i2c->dev;
399 unsigned long timeout;
400 unsigned int retries;
401 u8 status;
402 int ret;
403
404
405
406
407
408
409 udelay(30);
410
411
412
413
414
415
416 retries = 5;
417 do {
418 ret = sii902x_read_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
419 &status);
420 retries--;
421 } while (ret && retries);
422 if (ret) {
423 dev_err(dev, "failed to read status (%d)\n", ret);
424 return ret;
425 }
426
427 ret = sii902x_update_bits_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
428 SII902X_SYS_CTRL_DDC_BUS_REQ |
429 SII902X_SYS_CTRL_DDC_BUS_GRTD, 0);
430 if (ret)
431 return ret;
432
433 timeout = jiffies +
434 msecs_to_jiffies(SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS);
435 do {
436 ret = sii902x_read_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
437 &status);
438 if (ret)
439 return ret;
440 } while (status & (SII902X_SYS_CTRL_DDC_BUS_REQ |
441 SII902X_SYS_CTRL_DDC_BUS_GRTD) &&
442 time_before(jiffies, timeout));
443
444 if (status & (SII902X_SYS_CTRL_DDC_BUS_REQ |
445 SII902X_SYS_CTRL_DDC_BUS_GRTD)) {
446 dev_err(dev, "failed to release the i2c bus\n");
447 return -ETIMEDOUT;
448 }
449
450 return 0;
451}
452
453static int sii902x_probe(struct i2c_client *client,
454 const struct i2c_device_id *id)
455{
456 struct device *dev = &client->dev;
457 unsigned int status = 0;
458 struct sii902x *sii902x;
459 u8 chipid[4];
460 int ret;
461
462 ret = i2c_check_functionality(client->adapter,
463 I2C_FUNC_SMBUS_BYTE_DATA);
464 if (!ret) {
465 dev_err(dev, "I2C adapter not suitable\n");
466 return -EIO;
467 }
468
469 sii902x = devm_kzalloc(dev, sizeof(*sii902x), GFP_KERNEL);
470 if (!sii902x)
471 return -ENOMEM;
472
473 sii902x->i2c = client;
474 sii902x->regmap = devm_regmap_init_i2c(client, &sii902x_regmap_config);
475 if (IS_ERR(sii902x->regmap))
476 return PTR_ERR(sii902x->regmap);
477
478 sii902x->reset_gpio = devm_gpiod_get_optional(dev, "reset",
479 GPIOD_OUT_LOW);
480 if (IS_ERR(sii902x->reset_gpio)) {
481 dev_err(dev, "Failed to retrieve/request reset gpio: %ld\n",
482 PTR_ERR(sii902x->reset_gpio));
483 return PTR_ERR(sii902x->reset_gpio);
484 }
485
486 sii902x_reset(sii902x);
487
488 ret = regmap_write(sii902x->regmap, SII902X_REG_TPI_RQB, 0x0);
489 if (ret)
490 return ret;
491
492 ret = regmap_bulk_read(sii902x->regmap, SII902X_REG_CHIPID(0),
493 &chipid, 4);
494 if (ret) {
495 dev_err(dev, "regmap_read failed %d\n", ret);
496 return ret;
497 }
498
499 if (chipid[0] != 0xb0) {
500 dev_err(dev, "Invalid chipid: %02x (expecting 0xb0)\n",
501 chipid[0]);
502 return -EINVAL;
503 }
504
505
506 regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);
507 regmap_write(sii902x->regmap, SII902X_INT_STATUS, status);
508
509 if (client->irq > 0) {
510 regmap_write(sii902x->regmap, SII902X_INT_ENABLE,
511 SII902X_HOTPLUG_EVENT);
512
513 ret = devm_request_threaded_irq(dev, client->irq, NULL,
514 sii902x_interrupt,
515 IRQF_ONESHOT, dev_name(dev),
516 sii902x);
517 if (ret)
518 return ret;
519 }
520
521 sii902x->bridge.funcs = &sii902x_bridge_funcs;
522 sii902x->bridge.of_node = dev->of_node;
523 drm_bridge_add(&sii902x->bridge);
524
525 i2c_set_clientdata(client, sii902x);
526
527 sii902x->i2cmux = i2c_mux_alloc(client->adapter, dev,
528 1, 0, I2C_MUX_GATE,
529 sii902x_i2c_bypass_select,
530 sii902x_i2c_bypass_deselect);
531 if (!sii902x->i2cmux)
532 return -ENOMEM;
533
534 sii902x->i2cmux->priv = sii902x;
535 return i2c_mux_add_adapter(sii902x->i2cmux, 0, 0, 0);
536}
537
538static int sii902x_remove(struct i2c_client *client)
539
540{
541 struct sii902x *sii902x = i2c_get_clientdata(client);
542
543 i2c_mux_del_adapters(sii902x->i2cmux);
544 drm_bridge_remove(&sii902x->bridge);
545
546 return 0;
547}
548
549static const struct of_device_id sii902x_dt_ids[] = {
550 { .compatible = "sil,sii9022", },
551 { }
552};
553MODULE_DEVICE_TABLE(of, sii902x_dt_ids);
554
555static const struct i2c_device_id sii902x_i2c_ids[] = {
556 { "sii9022", 0 },
557 { },
558};
559MODULE_DEVICE_TABLE(i2c, sii902x_i2c_ids);
560
561static struct i2c_driver sii902x_driver = {
562 .probe = sii902x_probe,
563 .remove = sii902x_remove,
564 .driver = {
565 .name = "sii902x",
566 .of_match_table = sii902x_dt_ids,
567 },
568 .id_table = sii902x_i2c_ids,
569};
570module_i2c_driver(sii902x_driver);
571
572MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
573MODULE_DESCRIPTION("SII902x RGB -> HDMI bridges");
574MODULE_LICENSE("GPL");
575
