drivers/gpu/drm/bridge/sii902x.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (C) 2018 Renesas Electronics
   4  *
   5  * Copyright (C) 2016 Atmel
   6  *                    Bo Shen <voice.shen@atmel.com>
   7  *
   8  * Authors:           Bo Shen <voice.shen@atmel.com>
   9  *                    Boris Brezillon <boris.brezillon@free-electrons.com>
  10  *                    Wu, Songjun <Songjun.Wu@atmel.com>
  11  *
  12  * Copyright (C) 2010-2011 Freescale Semiconductor, Inc. All Rights Reserved.
  13  */
  14
  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 #include <linux/regulator/consumer.h>
  21 #include <linux/clk.h>
  22
  23 #include <drm/drm_atomic_helper.h>
  24 #include <drm/drm_bridge.h>
  25 #include <drm/drm_drv.h>
  26 #include <drm/drm_edid.h>
  27 #include <drm/drm_print.h>
  28 #include <drm/drm_probe_helper.h>
  29
  30 #include <sound/hdmi-codec.h>
  31
  32 #define SII902X_TPI_VIDEO_DATA                  0x0
  33
  34 #define SII902X_TPI_PIXEL_REPETITION            0x8
  35 #define SII902X_TPI_AVI_PIXEL_REP_BUS_24BIT     BIT(5)
  36 #define SII902X_TPI_AVI_PIXEL_REP_RISING_EDGE   BIT(4)
  37 #define SII902X_TPI_AVI_PIXEL_REP_4X            3
  38 #define SII902X_TPI_AVI_PIXEL_REP_2X            1
  39 #define SII902X_TPI_AVI_PIXEL_REP_NONE          0
  40 #define SII902X_TPI_CLK_RATIO_HALF              (0 << 6)
  41 #define SII902X_TPI_CLK_RATIO_1X                (1 << 6)
  42 #define SII902X_TPI_CLK_RATIO_2X                (2 << 6)
  43 #define SII902X_TPI_CLK_RATIO_4X                (3 << 6)
  44
  45 #define SII902X_TPI_AVI_IN_FORMAT               0x9
  46 #define SII902X_TPI_AVI_INPUT_BITMODE_12BIT     BIT(7)
  47 #define SII902X_TPI_AVI_INPUT_DITHER            BIT(6)
  48 #define SII902X_TPI_AVI_INPUT_RANGE_LIMITED     (2 << 2)
  49 #define SII902X_TPI_AVI_INPUT_RANGE_FULL        (1 << 2)
  50 #define SII902X_TPI_AVI_INPUT_RANGE_AUTO        (0 << 2)
  51 #define SII902X_TPI_AVI_INPUT_COLORSPACE_BLACK  (3 << 0)
  52 #define SII902X_TPI_AVI_INPUT_COLORSPACE_YUV422 (2 << 0)
  53 #define SII902X_TPI_AVI_INPUT_COLORSPACE_YUV444 (1 << 0)
  54 #define SII902X_TPI_AVI_INPUT_COLORSPACE_RGB    (0 << 0)
  55
  56 #define SII902X_TPI_AVI_INFOFRAME               0x0c
  57
  58 #define SII902X_SYS_CTRL_DATA                   0x1a
  59 #define SII902X_SYS_CTRL_PWR_DWN                BIT(4)
  60 #define SII902X_SYS_CTRL_AV_MUTE                BIT(3)
  61 #define SII902X_SYS_CTRL_DDC_BUS_REQ            BIT(2)
  62 #define SII902X_SYS_CTRL_DDC_BUS_GRTD           BIT(1)
  63 #define SII902X_SYS_CTRL_OUTPUT_MODE            BIT(0)
  64 #define SII902X_SYS_CTRL_OUTPUT_HDMI            1
  65 #define SII902X_SYS_CTRL_OUTPUT_DVI             0
  66
  67 #define SII902X_REG_CHIPID(n)                   (0x1b + (n))
  68
  69 #define SII902X_PWR_STATE_CTRL                  0x1e
  70 #define SII902X_AVI_POWER_STATE_MSK             GENMASK(1, 0)
  71 #define SII902X_AVI_POWER_STATE_D(l)            ((l) & SII902X_AVI_POWER_STATE_MSK)
  72
  73 /* Audio  */
  74 #define SII902X_TPI_I2S_ENABLE_MAPPING_REG      0x1f
  75 #define SII902X_TPI_I2S_CONFIG_FIFO0                    (0 << 0)
  76 #define SII902X_TPI_I2S_CONFIG_FIFO1                    (1 << 0)
  77 #define SII902X_TPI_I2S_CONFIG_FIFO2                    (2 << 0)
  78 #define SII902X_TPI_I2S_CONFIG_FIFO3                    (3 << 0)
  79 #define SII902X_TPI_I2S_LEFT_RIGHT_SWAP                 (1 << 2)
  80 #define SII902X_TPI_I2S_AUTO_DOWNSAMPLE                 (1 << 3)
  81 #define SII902X_TPI_I2S_SELECT_SD0                      (0 << 4)
  82 #define SII902X_TPI_I2S_SELECT_SD1                      (1 << 4)
  83 #define SII902X_TPI_I2S_SELECT_SD2                      (2 << 4)
  84 #define SII902X_TPI_I2S_SELECT_SD3                      (3 << 4)
  85 #define SII902X_TPI_I2S_FIFO_ENABLE                     (1 << 7)
  86
  87 #define SII902X_TPI_I2S_INPUT_CONFIG_REG        0x20
  88 #define SII902X_TPI_I2S_FIRST_BIT_SHIFT_YES             (0 << 0)
  89 #define SII902X_TPI_I2S_FIRST_BIT_SHIFT_NO              (1 << 0)
  90 #define SII902X_TPI_I2S_SD_DIRECTION_MSB_FIRST          (0 << 1)
  91 #define SII902X_TPI_I2S_SD_DIRECTION_LSB_FIRST          (1 << 1)
  92 #define SII902X_TPI_I2S_SD_JUSTIFY_LEFT                 (0 << 2)
  93 #define SII902X_TPI_I2S_SD_JUSTIFY_RIGHT                (1 << 2)
  94 #define SII902X_TPI_I2S_WS_POLARITY_LOW                 (0 << 3)
  95 #define SII902X_TPI_I2S_WS_POLARITY_HIGH                (1 << 3)
  96 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_128             (0 << 4)
  97 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_256             (1 << 4)
  98 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_384             (2 << 4)
  99 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_512             (3 << 4)
 100 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_768             (4 << 4)
 101 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_1024            (5 << 4)
 102 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_1152            (6 << 4)
 103 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_192             (7 << 4)
 104 #define SII902X_TPI_I2S_SCK_EDGE_FALLING                (0 << 7)
 105 #define SII902X_TPI_I2S_SCK_EDGE_RISING                 (1 << 7)
 106
 107 #define SII902X_TPI_I2S_STRM_HDR_BASE   0x21
 108 #define SII902X_TPI_I2S_STRM_HDR_SIZE   5
 109
 110 #define SII902X_TPI_AUDIO_CONFIG_BYTE2_REG      0x26
 111 #define SII902X_TPI_AUDIO_CODING_STREAM_HEADER          (0 << 0)
 112 #define SII902X_TPI_AUDIO_CODING_PCM                    (1 << 0)
 113 #define SII902X_TPI_AUDIO_CODING_AC3                    (2 << 0)
 114 #define SII902X_TPI_AUDIO_CODING_MPEG1                  (3 << 0)
 115 #define SII902X_TPI_AUDIO_CODING_MP3                    (4 << 0)
 116 #define SII902X_TPI_AUDIO_CODING_MPEG2                  (5 << 0)
 117 #define SII902X_TPI_AUDIO_CODING_AAC                    (6 << 0)
 118 #define SII902X_TPI_AUDIO_CODING_DTS                    (7 << 0)
 119 #define SII902X_TPI_AUDIO_CODING_ATRAC                  (8 << 0)
 120 #define SII902X_TPI_AUDIO_MUTE_DISABLE                  (0 << 4)
 121 #define SII902X_TPI_AUDIO_MUTE_ENABLE                   (1 << 4)
 122 #define SII902X_TPI_AUDIO_LAYOUT_2_CHANNELS             (0 << 5)
 123 #define SII902X_TPI_AUDIO_LAYOUT_8_CHANNELS             (1 << 5)
 124 #define SII902X_TPI_AUDIO_INTERFACE_DISABLE             (0 << 6)
 125 #define SII902X_TPI_AUDIO_INTERFACE_SPDIF               (1 << 6)
 126 #define SII902X_TPI_AUDIO_INTERFACE_I2S                 (2 << 6)
 127
 128 #define SII902X_TPI_AUDIO_CONFIG_BYTE3_REG      0x27
 129 #define SII902X_TPI_AUDIO_FREQ_STREAM                   (0 << 3)
 130 #define SII902X_TPI_AUDIO_FREQ_32KHZ                    (1 << 3)
 131 #define SII902X_TPI_AUDIO_FREQ_44KHZ                    (2 << 3)
 132 #define SII902X_TPI_AUDIO_FREQ_48KHZ                    (3 << 3)
 133 #define SII902X_TPI_AUDIO_FREQ_88KHZ                    (4 << 3)
 134 #define SII902X_TPI_AUDIO_FREQ_96KHZ                    (5 << 3)
 135 #define SII902X_TPI_AUDIO_FREQ_176KHZ                   (6 << 3)
 136 #define SII902X_TPI_AUDIO_FREQ_192KHZ                   (7 << 3)
 137 #define SII902X_TPI_AUDIO_SAMPLE_SIZE_STREAM            (0 << 6)
 138 #define SII902X_TPI_AUDIO_SAMPLE_SIZE_16                (1 << 6)
 139 #define SII902X_TPI_AUDIO_SAMPLE_SIZE_20                (2 << 6)
 140 #define SII902X_TPI_AUDIO_SAMPLE_SIZE_24                (3 << 6)
 141
 142 #define SII902X_TPI_AUDIO_CONFIG_BYTE4_REG      0x28
 143
 144 #define SII902X_INT_ENABLE                      0x3c
 145 #define SII902X_INT_STATUS                      0x3d
 146 #define SII902X_HOTPLUG_EVENT                   BIT(0)
 147 #define SII902X_PLUGGED_STATUS                  BIT(2)
 148
 149 #define SII902X_REG_TPI_RQB                     0xc7
 150
 151 /* Indirect internal register access */
 152 #define SII902X_IND_SET_PAGE                    0xbc
 153 #define SII902X_IND_OFFSET                      0xbd
 154 #define SII902X_IND_VALUE                       0xbe
 155
 156 #define SII902X_TPI_MISC_INFOFRAME_BASE         0xbf
 157 #define SII902X_TPI_MISC_INFOFRAME_END          0xde
 158 #define SII902X_TPI_MISC_INFOFRAME_SIZE \
 159         (SII902X_TPI_MISC_INFOFRAME_END - SII902X_TPI_MISC_INFOFRAME_BASE)
 160
 161 #define SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS  500
 162
 163 #define SII902X_AUDIO_PORT_INDEX                3
 164
 165 struct sii902x {
 166         struct i2c_client *i2c;
 167         struct regmap *regmap;
 168         struct drm_bridge bridge;
 169         struct drm_bridge *next_bridge;
 170         struct drm_connector connector;
 171         struct gpio_desc *reset_gpio;
 172         struct i2c_mux_core *i2cmux;
 173         struct regulator_bulk_data supplies[2];
 174         bool sink_is_hdmi;
 175         /*
 176          * Mutex protects audio and video functions from interfering
 177          * each other, by keeping their i2c command sequences atomic.
 178          */
 179         struct mutex mutex;
 180         struct sii902x_audio {
 181                 struct platform_device *pdev;
 182                 struct clk *mclk;
 183                 u32 i2s_fifo_sequence[4];
 184         } audio;
 185 };
 186
 187 static int sii902x_read_unlocked(struct i2c_client *i2c, u8 reg, u8 *val)
 188 {
 189         union i2c_smbus_data data;
 190         int ret;
 191
 192         ret = __i2c_smbus_xfer(i2c->adapter, i2c->addr, i2c->flags,
 193                                I2C_SMBUS_READ, reg, I2C_SMBUS_BYTE_DATA, &data);
 194
 195         if (ret < 0)
 196                 return ret;
 197
 198         *val = data.byte;
 199         return 0;
 200 }
 201
 202 static int sii902x_write_unlocked(struct i2c_client *i2c, u8 reg, u8 val)
 203 {
 204         union i2c_smbus_data data;
 205
 206         data.byte = val;
 207
 208         return __i2c_smbus_xfer(i2c->adapter, i2c->addr, i2c->flags,
 209                                 I2C_SMBUS_WRITE, reg, I2C_SMBUS_BYTE_DATA,
 210                                 &data);
 211 }
 212
 213 static int sii902x_update_bits_unlocked(struct i2c_client *i2c, u8 reg, u8 mask,
 214                                         u8 val)
 215 {
 216         int ret;
 217         u8 status;
 218
 219         ret = sii902x_read_unlocked(i2c, reg, &status);
 220         if (ret)
 221                 return ret;
 222         status &= ~mask;
 223         status |= val & mask;
 224         return sii902x_write_unlocked(i2c, reg, status);
 225 }
 226
 227 static inline struct sii902x *bridge_to_sii902x(struct drm_bridge *bridge)
 228 {
 229         return container_of(bridge, struct sii902x, bridge);
 230 }
 231
 232 static inline struct sii902x *connector_to_sii902x(struct drm_connector *con)
 233 {
 234         return container_of(con, struct sii902x, connector);
 235 }
 236
 237 static void sii902x_reset(struct sii902x *sii902x)
 238 {
 239         if (!sii902x->reset_gpio)
 240                 return;
 241
 242         gpiod_set_value(sii902x->reset_gpio, 1);
 243
 244         /* The datasheet says treset-min = 100us. Make it 150us to be sure. */
 245         usleep_range(150, 200);
 246
 247         gpiod_set_value(sii902x->reset_gpio, 0);
 248 }
 249
 250 static enum drm_connector_status sii902x_detect(struct sii902x *sii902x)
 251 {
 252         unsigned int status;
 253
 254         mutex_lock(&sii902x->mutex);
 255
 256         regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);
 257
 258         mutex_unlock(&sii902x->mutex);
 259
 260         return (status & SII902X_PLUGGED_STATUS) ?
 261                connector_status_connected : connector_status_disconnected;
 262 }
 263
 264 static enum drm_connector_status
 265 sii902x_connector_detect(struct drm_connector *connector, bool force)
 266 {
 267         struct sii902x *sii902x = connector_to_sii902x(connector);
 268
 269         return sii902x_detect(sii902x);
 270 }
 271
 272 static const struct drm_connector_funcs sii902x_connector_funcs = {
 273         .detect = sii902x_connector_detect,
 274         .fill_modes = drm_helper_probe_single_connector_modes,
 275         .destroy = drm_connector_cleanup,
 276         .reset = drm_atomic_helper_connector_reset,
 277         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 278         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 279 };
 280
 281 static struct edid *sii902x_get_edid(struct sii902x *sii902x,
 282                                      struct drm_connector *connector)
 283 {
 284         struct edid *edid;
 285
 286         mutex_lock(&sii902x->mutex);
 287
 288         edid = drm_get_edid(connector, sii902x->i2cmux->adapter[0]);
 289         if (edid) {
 290                 if (drm_detect_hdmi_monitor(edid))
 291                         sii902x->sink_is_hdmi = true;
 292                 else
 293                         sii902x->sink_is_hdmi = false;
 294         }
 295
 296         mutex_unlock(&sii902x->mutex);
 297
 298         return edid;
 299 }
 300
 301 static int sii902x_get_modes(struct drm_connector *connector)
 302 {
 303         struct sii902x *sii902x = connector_to_sii902x(connector);
 304         struct edid *edid;
 305         int num = 0;
 306
 307         edid = sii902x_get_edid(sii902x, connector);
 308         drm_connector_update_edid_property(connector, edid);
 309         if (edid) {
 310                 num = drm_add_edid_modes(connector, edid);
 311                 kfree(edid);
 312         }
 313
 314         return num;
 315 }
 316
 317 static enum drm_mode_status sii902x_mode_valid(struct drm_connector *connector,
 318                                                struct drm_display_mode *mode)
 319 {
 320         /* TODO: check mode */
 321
 322         return MODE_OK;
 323 }
 324
 325 static const struct drm_connector_helper_funcs sii902x_connector_helper_funcs = {
 326         .get_modes = sii902x_get_modes,
 327         .mode_valid = sii902x_mode_valid,
 328 };
 329
 330 static void sii902x_bridge_disable(struct drm_bridge *bridge)
 331 {
 332         struct sii902x *sii902x = bridge_to_sii902x(bridge);
 333
 334         mutex_lock(&sii902x->mutex);
 335
 336         regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA,
 337                            SII902X_SYS_CTRL_PWR_DWN,
 338                            SII902X_SYS_CTRL_PWR_DWN);
 339
 340         mutex_unlock(&sii902x->mutex);
 341 }
 342
 343 static void sii902x_bridge_enable(struct drm_bridge *bridge)
 344 {
 345         struct sii902x *sii902x = bridge_to_sii902x(bridge);
 346
 347         mutex_lock(&sii902x->mutex);
 348
 349         regmap_update_bits(sii902x->regmap, SII902X_PWR_STATE_CTRL,
 350                            SII902X_AVI_POWER_STATE_MSK,
 351                            SII902X_AVI_POWER_STATE_D(0));
 352         regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA,
 353                            SII902X_SYS_CTRL_PWR_DWN, 0);
 354
 355         mutex_unlock(&sii902x->mutex);
 356 }
 357
 358 static void sii902x_bridge_mode_set(struct drm_bridge *bridge,
 359                                     const struct drm_display_mode *mode,
 360                                     const struct drm_display_mode *adj)
 361 {
 362         struct sii902x *sii902x = bridge_to_sii902x(bridge);
 363         u8 output_mode = SII902X_SYS_CTRL_OUTPUT_DVI;
 364         struct regmap *regmap = sii902x->regmap;
 365         u8 buf[HDMI_INFOFRAME_SIZE(AVI)];
 366         struct hdmi_avi_infoframe frame;
 367         u16 pixel_clock_10kHz = adj->clock / 10;
 368         int ret;
 369
 370         if (sii902x->sink_is_hdmi)
 371                 output_mode = SII902X_SYS_CTRL_OUTPUT_HDMI;
 372
 373         buf[0] = pixel_clock_10kHz & 0xff;
 374         buf[1] = pixel_clock_10kHz >> 8;
 375         buf[2] = drm_mode_vrefresh(adj);
 376         buf[3] = 0x00;
 377         buf[4] = adj->hdisplay;
 378         buf[5] = adj->hdisplay >> 8;
 379         buf[6] = adj->vdisplay;
 380         buf[7] = adj->vdisplay >> 8;
 381         buf[8] = SII902X_TPI_CLK_RATIO_1X | SII902X_TPI_AVI_PIXEL_REP_NONE |
 382                  SII902X_TPI_AVI_PIXEL_REP_BUS_24BIT;
 383         buf[9] = SII902X_TPI_AVI_INPUT_RANGE_AUTO |
 384                  SII902X_TPI_AVI_INPUT_COLORSPACE_RGB;
 385
 386         mutex_lock(&sii902x->mutex);
 387
 388         ret = regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA,
 389                                  SII902X_SYS_CTRL_OUTPUT_MODE, output_mode);
 390         if (ret)
 391                 goto out;
 392
 393         ret = regmap_bulk_write(regmap, SII902X_TPI_VIDEO_DATA, buf, 10);
 394         if (ret)
 395                 goto out;
 396
 397         ret = drm_hdmi_avi_infoframe_from_display_mode(&frame,
 398                                                        &sii902x->connector, adj);
 399         if (ret < 0) {
 400                 DRM_ERROR("couldn't fill AVI infoframe\n");
 401                 goto out;
 402         }
 403
 404         ret = hdmi_avi_infoframe_pack(&frame, buf, sizeof(buf));
 405         if (ret < 0) {
 406                 DRM_ERROR("failed to pack AVI infoframe: %d\n", ret);
 407                 goto out;
 408         }
 409
 410         /* Do not send the infoframe header, but keep the CRC field. */
 411         regmap_bulk_write(regmap, SII902X_TPI_AVI_INFOFRAME,
 412                           buf + HDMI_INFOFRAME_HEADER_SIZE - 1,
 413                           HDMI_AVI_INFOFRAME_SIZE + 1);
 414
 415 out:
 416         mutex_unlock(&sii902x->mutex);
 417 }
 418
 419 static int sii902x_bridge_attach(struct drm_bridge *bridge,
 420                                  enum drm_bridge_attach_flags flags)
 421 {
 422         struct sii902x *sii902x = bridge_to_sii902x(bridge);
 423         u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
 424         struct drm_device *drm = bridge->dev;
 425         int ret;
 426
 427         if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)
 428                 return drm_bridge_attach(bridge->encoder, sii902x->next_bridge,
 429                                          bridge, flags);
 430
 431         drm_connector_helper_add(&sii902x->connector,
 432                                  &sii902x_connector_helper_funcs);
 433
 434         if (!drm_core_check_feature(drm, DRIVER_ATOMIC)) {
 435                 dev_err(&sii902x->i2c->dev,
 436                         "sii902x driver is only compatible with DRM devices supporting atomic updates\n");
 437                 return -ENOTSUPP;
 438         }
 439
 440         ret = drm_connector_init(drm, &sii902x->connector,
 441                                  &sii902x_connector_funcs,
 442                                  DRM_MODE_CONNECTOR_HDMIA);
 443         if (ret)
 444                 return ret;
 445
 446         if (sii902x->i2c->irq > 0)
 447                 sii902x->connector.polled = DRM_CONNECTOR_POLL_HPD;
 448         else
 449                 sii902x->connector.polled = DRM_CONNECTOR_POLL_CONNECT;
 450
 451         ret = drm_display_info_set_bus_formats(&sii902x->connector.display_info,
 452                                                &bus_format, 1);
 453         if (ret)
 454                 return ret;
 455
 456         drm_connector_attach_encoder(&sii902x->connector, bridge->encoder);
 457
 458         return 0;
 459 }
 460
 461 static enum drm_connector_status sii902x_bridge_detect(struct drm_bridge *bridge)
 462 {
 463         struct sii902x *sii902x = bridge_to_sii902x(bridge);
 464
 465         return sii902x_detect(sii902x);
 466 }
 467
 468 static struct edid *sii902x_bridge_get_edid(struct drm_bridge *bridge,
 469                                             struct drm_connector *connector)
 470 {
 471         struct sii902x *sii902x = bridge_to_sii902x(bridge);
 472
 473         return sii902x_get_edid(sii902x, connector);
 474 }
 475
 476 static const struct drm_bridge_funcs sii902x_bridge_funcs = {
 477         .attach = sii902x_bridge_attach,
 478         .mode_set = sii902x_bridge_mode_set,
 479         .disable = sii902x_bridge_disable,
 480         .enable = sii902x_bridge_enable,
 481         .detect = sii902x_bridge_detect,
 482         .get_edid = sii902x_bridge_get_edid,
 483 };
 484
 485 static int sii902x_mute(struct sii902x *sii902x, bool mute)
 486 {
 487         struct device *dev = &sii902x->i2c->dev;
 488         unsigned int val = mute ? SII902X_TPI_AUDIO_MUTE_ENABLE :
 489                 SII902X_TPI_AUDIO_MUTE_DISABLE;
 490
 491         dev_dbg(dev, "%s: %s\n", __func__, mute ? "Muted" : "Unmuted");
 492
 493         return regmap_update_bits(sii902x->regmap,
 494                                   SII902X_TPI_AUDIO_CONFIG_BYTE2_REG,
 495                                   SII902X_TPI_AUDIO_MUTE_ENABLE, val);
 496 }
 497
 498 static const int sii902x_mclk_div_table[] = {
 499         128, 256, 384, 512, 768, 1024, 1152, 192 };
 500
 501 static int sii902x_select_mclk_div(u8 *i2s_config_reg, unsigned int rate,
 502                                    unsigned int mclk)
 503 {
 504         int div = mclk / rate;
 505         int distance = 100000;
 506         u8 i, nearest = 0;
 507
 508         for (i = 0; i < ARRAY_SIZE(sii902x_mclk_div_table); i++) {
 509                 unsigned int d = abs(div - sii902x_mclk_div_table[i]);
 510
 511                 if (d >= distance)
 512                         continue;
 513
 514                 nearest = i;
 515                 distance = d;
 516                 if (d == 0)
 517                         break;
 518         }
 519
 520         *i2s_config_reg |= nearest << 4;
 521
 522         return sii902x_mclk_div_table[nearest];
 523 }
 524
 525 static const struct sii902x_sample_freq {
 526         u32 freq;
 527         u8 val;
 528 } sii902x_sample_freq[] = {
 529         { .freq = 32000,        .val = SII902X_TPI_AUDIO_FREQ_32KHZ },
 530         { .freq = 44000,        .val = SII902X_TPI_AUDIO_FREQ_44KHZ },
 531         { .freq = 48000,        .val = SII902X_TPI_AUDIO_FREQ_48KHZ },
 532         { .freq = 88000,        .val = SII902X_TPI_AUDIO_FREQ_88KHZ },
 533         { .freq = 96000,        .val = SII902X_TPI_AUDIO_FREQ_96KHZ },
 534         { .freq = 176000,       .val = SII902X_TPI_AUDIO_FREQ_176KHZ },
 535         { .freq = 192000,       .val = SII902X_TPI_AUDIO_FREQ_192KHZ },
 536 };
 537
 538 static int sii902x_audio_hw_params(struct device *dev, void *data,
 539                                    struct hdmi_codec_daifmt *daifmt,
 540                                    struct hdmi_codec_params *params)
 541 {
 542         struct sii902x *sii902x = dev_get_drvdata(dev);
 543         u8 i2s_config_reg = SII902X_TPI_I2S_SD_DIRECTION_MSB_FIRST;
 544         u8 config_byte2_reg = (SII902X_TPI_AUDIO_INTERFACE_I2S |
 545                                SII902X_TPI_AUDIO_MUTE_ENABLE |
 546                                SII902X_TPI_AUDIO_CODING_PCM);
 547         u8 config_byte3_reg = 0;
 548         u8 infoframe_buf[HDMI_INFOFRAME_SIZE(AUDIO)];
 549         unsigned long mclk_rate;
 550         int i, ret;
 551
 552         if (daifmt->bit_clk_master || daifmt->frame_clk_master) {
 553                 dev_dbg(dev, "%s: I2S master mode not supported\n", __func__);
 554                 return -EINVAL;
 555         }
 556
 557         switch (daifmt->fmt) {
 558         case HDMI_I2S:
 559                 i2s_config_reg |= SII902X_TPI_I2S_FIRST_BIT_SHIFT_YES |
 560                         SII902X_TPI_I2S_SD_JUSTIFY_LEFT;
 561                 break;
 562         case HDMI_RIGHT_J:
 563                 i2s_config_reg |= SII902X_TPI_I2S_SD_JUSTIFY_RIGHT;
 564                 break;
 565         case HDMI_LEFT_J:
 566                 i2s_config_reg |= SII902X_TPI_I2S_SD_JUSTIFY_LEFT;
 567                 break;
 568         default:
 569                 dev_dbg(dev, "%s: Unsupported i2s format %u\n", __func__,
 570                         daifmt->fmt);
 571                 return -EINVAL;
 572         }
 573
 574         if (daifmt->bit_clk_inv)
 575                 i2s_config_reg |= SII902X_TPI_I2S_SCK_EDGE_FALLING;
 576         else
 577                 i2s_config_reg |= SII902X_TPI_I2S_SCK_EDGE_RISING;
 578
 579         if (daifmt->frame_clk_inv)
 580                 i2s_config_reg |= SII902X_TPI_I2S_WS_POLARITY_LOW;
 581         else
 582                 i2s_config_reg |= SII902X_TPI_I2S_WS_POLARITY_HIGH;
 583
 584         if (params->channels > 2)
 585                 config_byte2_reg |= SII902X_TPI_AUDIO_LAYOUT_8_CHANNELS;
 586         else
 587                 config_byte2_reg |= SII902X_TPI_AUDIO_LAYOUT_2_CHANNELS;
 588
 589         switch (params->sample_width) {
 590         case 16:
 591                 config_byte3_reg |= SII902X_TPI_AUDIO_SAMPLE_SIZE_16;
 592                 break;
 593         case 20:
 594                 config_byte3_reg |= SII902X_TPI_AUDIO_SAMPLE_SIZE_20;
 595                 break;
 596         case 24:
 597         case 32:
 598                 config_byte3_reg |= SII902X_TPI_AUDIO_SAMPLE_SIZE_24;
 599                 break;
 600         default:
 601                 dev_err(dev, "%s: Unsupported sample width %u\n", __func__,
 602                         params->sample_width);
 603                 return -EINVAL;
 604         }
 605
 606         for (i = 0; i < ARRAY_SIZE(sii902x_sample_freq); i++) {
 607                 if (params->sample_rate == sii902x_sample_freq[i].freq) {
 608                         config_byte3_reg |= sii902x_sample_freq[i].val;
 609                         break;
 610                 }
 611         }
 612
 613         ret = clk_prepare_enable(sii902x->audio.mclk);
 614         if (ret) {
 615                 dev_err(dev, "Enabling mclk failed: %d\n", ret);
 616                 return ret;
 617         }
 618
 619         if (sii902x->audio.mclk) {
 620                 mclk_rate = clk_get_rate(sii902x->audio.mclk);
 621                 ret = sii902x_select_mclk_div(&i2s_config_reg,
 622                                               params->sample_rate, mclk_rate);
 623                 if (mclk_rate != ret * params->sample_rate)
 624                         dev_dbg(dev, "Inaccurate reference clock (%ld/%d != %u)\n",
 625                                 mclk_rate, ret, params->sample_rate);
 626         }
 627
 628         mutex_lock(&sii902x->mutex);
 629
 630         ret = regmap_write(sii902x->regmap,
 631                            SII902X_TPI_AUDIO_CONFIG_BYTE2_REG,
 632                            config_byte2_reg);
 633         if (ret < 0)
 634                 goto out;
 635
 636         ret = regmap_write(sii902x->regmap, SII902X_TPI_I2S_INPUT_CONFIG_REG,
 637                            i2s_config_reg);
 638         if (ret)
 639                 goto out;
 640
 641         for (i = 0; i < ARRAY_SIZE(sii902x->audio.i2s_fifo_sequence) &&
 642                     sii902x->audio.i2s_fifo_sequence[i]; i++)
 643                 regmap_write(sii902x->regmap,
 644                              SII902X_TPI_I2S_ENABLE_MAPPING_REG,
 645                              sii902x->audio.i2s_fifo_sequence[i]);
 646
 647         ret = regmap_write(sii902x->regmap, SII902X_TPI_AUDIO_CONFIG_BYTE3_REG,
 648                            config_byte3_reg);
 649         if (ret)
 650                 goto out;
 651
 652         ret = regmap_bulk_write(sii902x->regmap, SII902X_TPI_I2S_STRM_HDR_BASE,
 653                                 params->iec.status,
 654                                 min((size_t) SII902X_TPI_I2S_STRM_HDR_SIZE,
 655                                     sizeof(params->iec.status)));
 656         if (ret)
 657                 goto out;
 658
 659         ret = hdmi_audio_infoframe_pack(&params->cea, infoframe_buf,
 660                                         sizeof(infoframe_buf));
 661         if (ret < 0) {
 662                 dev_err(dev, "%s: Failed to pack audio infoframe: %d\n",
 663                         __func__, ret);
 664                 goto out;
 665         }
 666
 667         ret = regmap_bulk_write(sii902x->regmap,
 668                                 SII902X_TPI_MISC_INFOFRAME_BASE,
 669                                 infoframe_buf,
 670                                 min(ret, SII902X_TPI_MISC_INFOFRAME_SIZE));
 671         if (ret)
 672                 goto out;
 673
 674         /* Decode Level 0 Packets */
 675         ret = regmap_write(sii902x->regmap, SII902X_IND_SET_PAGE, 0x02);
 676         if (ret)
 677                 goto out;
 678
 679         ret = regmap_write(sii902x->regmap, SII902X_IND_OFFSET, 0x24);
 680         if (ret)
 681                 goto out;
 682
 683         ret = regmap_write(sii902x->regmap, SII902X_IND_VALUE, 0x02);
 684         if (ret)
 685                 goto out;
 686
 687         dev_dbg(dev, "%s: hdmi audio enabled\n", __func__);
 688 out:
 689         mutex_unlock(&sii902x->mutex);
 690
 691         if (ret) {
 692                 clk_disable_unprepare(sii902x->audio.mclk);
 693                 dev_err(dev, "%s: hdmi audio enable failed: %d\n", __func__,
 694                         ret);
 695         }
 696
 697         return ret;
 698 }
 699
 700 static void sii902x_audio_shutdown(struct device *dev, void *data)
 701 {
 702         struct sii902x *sii902x = dev_get_drvdata(dev);
 703
 704         mutex_lock(&sii902x->mutex);
 705
 706         regmap_write(sii902x->regmap, SII902X_TPI_AUDIO_CONFIG_BYTE2_REG,
 707                      SII902X_TPI_AUDIO_INTERFACE_DISABLE);
 708
 709         mutex_unlock(&sii902x->mutex);
 710
 711         clk_disable_unprepare(sii902x->audio.mclk);
 712 }
 713
 714 static int sii902x_audio_mute(struct device *dev, void *data,
 715                               bool enable, int direction)
 716 {
 717         struct sii902x *sii902x = dev_get_drvdata(dev);
 718
 719         mutex_lock(&sii902x->mutex);
 720
 721         sii902x_mute(sii902x, enable);
 722
 723         mutex_unlock(&sii902x->mutex);
 724
 725         return 0;
 726 }
 727
 728 static int sii902x_audio_get_eld(struct device *dev, void *data,
 729                                  uint8_t *buf, size_t len)
 730 {
 731         struct sii902x *sii902x = dev_get_drvdata(dev);
 732
 733         mutex_lock(&sii902x->mutex);
 734
 735         memcpy(buf, sii902x->connector.eld,
 736                min(sizeof(sii902x->connector.eld), len));
 737
 738         mutex_unlock(&sii902x->mutex);
 739
 740         return 0;
 741 }
 742
 743 static int sii902x_audio_get_dai_id(struct snd_soc_component *component,
 744                                     struct device_node *endpoint)
 745 {
 746         struct of_endpoint of_ep;
 747         int ret;
 748
 749         ret = of_graph_parse_endpoint(endpoint, &of_ep);
 750         if (ret < 0)
 751                 return ret;
 752
 753         /*
 754          * HDMI sound should be located at reg = <3>
 755          * Return expected DAI index 0.
 756          */
 757         if (of_ep.port == SII902X_AUDIO_PORT_INDEX)
 758                 return 0;
 759
 760         return -EINVAL;
 761 }
 762
 763 static const struct hdmi_codec_ops sii902x_audio_codec_ops = {
 764         .hw_params = sii902x_audio_hw_params,
 765         .audio_shutdown = sii902x_audio_shutdown,
 766         .mute_stream = sii902x_audio_mute,
 767         .get_eld = sii902x_audio_get_eld,
 768         .get_dai_id = sii902x_audio_get_dai_id,
 769         .no_capture_mute = 1,
 770 };
 771
 772 static int sii902x_audio_codec_init(struct sii902x *sii902x,
 773                                     struct device *dev)
 774 {
 775         static const u8 audio_fifo_id[] = {
 776                 SII902X_TPI_I2S_CONFIG_FIFO0,
 777                 SII902X_TPI_I2S_CONFIG_FIFO1,
 778                 SII902X_TPI_I2S_CONFIG_FIFO2,
 779                 SII902X_TPI_I2S_CONFIG_FIFO3,
 780         };
 781         static const u8 i2s_lane_id[] = {
 782                 SII902X_TPI_I2S_SELECT_SD0,
 783                 SII902X_TPI_I2S_SELECT_SD1,
 784                 SII902X_TPI_I2S_SELECT_SD2,
 785                 SII902X_TPI_I2S_SELECT_SD3,
 786         };
 787         struct hdmi_codec_pdata codec_data = {
 788                 .ops = &sii902x_audio_codec_ops,
 789                 .i2s = 1, /* Only i2s support for now. */
 790                 .spdif = 0,
 791                 .max_i2s_channels = 0,
 792         };
 793         u8 lanes[4];
 794         int num_lanes, i;
 795
 796         if (!of_property_read_bool(dev->of_node, "#sound-dai-cells")) {
 797                 dev_dbg(dev, "%s: No \"#sound-dai-cells\", no audio\n",
 798                         __func__);
 799                 return 0;
 800         }
 801
 802         num_lanes = of_property_read_variable_u8_array(dev->of_node,
 803                                                        "sil,i2s-data-lanes",
 804                                                        lanes, 1,
 805                                                        ARRAY_SIZE(lanes));
 806
 807         if (num_lanes == -EINVAL) {
 808                 dev_dbg(dev,
 809                         "%s: No \"sil,i2s-data-lanes\", use default <0>\n",
 810                         __func__);
 811                 num_lanes = 1;
 812                 lanes[0] = 0;
 813         } else if (num_lanes < 0) {
 814                 dev_err(dev,
 815                         "%s: Error gettin \"sil,i2s-data-lanes\": %d\n",
 816                         __func__, num_lanes);
 817                 return num_lanes;
 818         }
 819         codec_data.max_i2s_channels = 2 * num_lanes;
 820
 821         for (i = 0; i < num_lanes; i++)
 822                 sii902x->audio.i2s_fifo_sequence[i] |= audio_fifo_id[i] |
 823                         i2s_lane_id[lanes[i]] | SII902X_TPI_I2S_FIFO_ENABLE;
 824
 825         sii902x->audio.mclk = devm_clk_get_optional(dev, "mclk");
 826         if (IS_ERR(sii902x->audio.mclk)) {
 827                 dev_err(dev, "%s: No clock (audio mclk) found: %ld\n",
 828                         __func__, PTR_ERR(sii902x->audio.mclk));
 829                 return PTR_ERR(sii902x->audio.mclk);
 830         }
 831
 832         sii902x->audio.pdev = platform_device_register_data(
 833                 dev, HDMI_CODEC_DRV_NAME, PLATFORM_DEVID_AUTO,
 834                 &codec_data, sizeof(codec_data));
 835
 836         return PTR_ERR_OR_ZERO(sii902x->audio.pdev);
 837 }
 838
 839 static const struct regmap_range sii902x_volatile_ranges[] = {
 840         { .range_min = 0, .range_max = 0xff },
 841 };
 842
 843 static const struct regmap_access_table sii902x_volatile_table = {
 844         .yes_ranges = sii902x_volatile_ranges,
 845         .n_yes_ranges = ARRAY_SIZE(sii902x_volatile_ranges),
 846 };
 847
 848 static const struct regmap_config sii902x_regmap_config = {
 849         .reg_bits = 8,
 850         .val_bits = 8,
 851         .disable_locking = true, /* struct sii902x mutex should be enough */
 852         .max_register = SII902X_TPI_MISC_INFOFRAME_END,
 853         .volatile_table = &sii902x_volatile_table,
 854         .cache_type = REGCACHE_NONE,
 855 };
 856
 857 static irqreturn_t sii902x_interrupt(int irq, void *data)
 858 {
 859         struct sii902x *sii902x = data;
 860         unsigned int status = 0;
 861
 862         mutex_lock(&sii902x->mutex);
 863
 864         regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);
 865         regmap_write(sii902x->regmap, SII902X_INT_STATUS, status);
 866
 867         mutex_unlock(&sii902x->mutex);
 868
 869         if ((status & SII902X_HOTPLUG_EVENT) && sii902x->bridge.dev) {
 870                 drm_helper_hpd_irq_event(sii902x->bridge.dev);
 871                 drm_bridge_hpd_notify(&sii902x->bridge, (status & SII902X_PLUGGED_STATUS)
 872                                                                 ? connector_status_connected
 873                                                                 : connector_status_disconnected);
 874         }
 875
 876         return IRQ_HANDLED;
 877 }
 878
 879 /*
 880  * The purpose of sii902x_i2c_bypass_select is to enable the pass through
 881  * mode of the HDMI transmitter. Do not use regmap from within this function,
 882  * only use sii902x_*_unlocked functions to read/modify/write registers.
 883  * We are holding the parent adapter lock here, keep this in mind before
 884  * adding more i2c transactions.
 885  *
 886  * Also, since SII902X_SYS_CTRL_DATA is used with regmap_update_bits elsewhere
 887  * in this driver, we need to make sure that we only touch 0x1A[2:1] from
 888  * within sii902x_i2c_bypass_select and sii902x_i2c_bypass_deselect, and that
 889  * we leave the remaining bits as we have found them.
 890  */
 891 static int sii902x_i2c_bypass_select(struct i2c_mux_core *mux, u32 chan_id)
 892 {
 893         struct sii902x *sii902x = i2c_mux_priv(mux);
 894         struct device *dev = &sii902x->i2c->dev;
 895         unsigned long timeout;
 896         u8 status;
 897         int ret;
 898
 899         ret = sii902x_update_bits_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
 900                                            SII902X_SYS_CTRL_DDC_BUS_REQ,
 901                                            SII902X_SYS_CTRL_DDC_BUS_REQ);
 902         if (ret)
 903                 return ret;
 904
 905         timeout = jiffies +
 906                   msecs_to_jiffies(SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS);
 907         do {
 908                 ret = sii902x_read_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
 909                                             &status);
 910                 if (ret)
 911                         return ret;
 912         } while (!(status & SII902X_SYS_CTRL_DDC_BUS_GRTD) &&
 913                  time_before(jiffies, timeout));
 914
 915         if (!(status & SII902X_SYS_CTRL_DDC_BUS_GRTD)) {
 916                 dev_err(dev, "Failed to acquire the i2c bus\n");
 917                 return -ETIMEDOUT;
 918         }
 919
 920         return sii902x_write_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
 921                                       status);
 922 }
 923
 924 /*
 925  * The purpose of sii902x_i2c_bypass_deselect is to disable the pass through
 926  * mode of the HDMI transmitter. Do not use regmap from within this function,
 927  * only use sii902x_*_unlocked functions to read/modify/write registers.
 928  * We are holding the parent adapter lock here, keep this in mind before
 929  * adding more i2c transactions.
 930  *
 931  * Also, since SII902X_SYS_CTRL_DATA is used with regmap_update_bits elsewhere
 932  * in this driver, we need to make sure that we only touch 0x1A[2:1] from
 933  * within sii902x_i2c_bypass_select and sii902x_i2c_bypass_deselect, and that
 934  * we leave the remaining bits as we have found them.
 935  */
 936 static int sii902x_i2c_bypass_deselect(struct i2c_mux_core *mux, u32 chan_id)
 937 {
 938         struct sii902x *sii902x = i2c_mux_priv(mux);
 939         struct device *dev = &sii902x->i2c->dev;
 940         unsigned long timeout;
 941         unsigned int retries;
 942         u8 status;
 943         int ret;
 944
 945         /*
 946          * When the HDMI transmitter is in pass through mode, we need an
 947          * (undocumented) additional delay between STOP and START conditions
 948          * to guarantee the bus won't get stuck.
 949          */
 950         udelay(30);
 951
 952         /*
 953          * Sometimes the I2C bus can stall after failure to use the
 954          * EDID channel. Retry a few times to see if things clear
 955          * up, else continue anyway.
 956          */
 957         retries = 5;
 958         do {
 959                 ret = sii902x_read_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
 960                                             &status);
 961                 retries--;
 962         } while (ret && retries);
 963         if (ret) {
 964                 dev_err(dev, "failed to read status (%d)\n", ret);
 965                 return ret;
 966         }
 967
 968         ret = sii902x_update_bits_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
 969                                            SII902X_SYS_CTRL_DDC_BUS_REQ |
 970                                            SII902X_SYS_CTRL_DDC_BUS_GRTD, 0);
 971         if (ret)
 972                 return ret;
 973
 974         timeout = jiffies +
 975                   msecs_to_jiffies(SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS);
 976         do {
 977                 ret = sii902x_read_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
 978                                             &status);
 979                 if (ret)
 980                         return ret;
 981         } while (status & (SII902X_SYS_CTRL_DDC_BUS_REQ |
 982                            SII902X_SYS_CTRL_DDC_BUS_GRTD) &&
 983                  time_before(jiffies, timeout));
 984
 985         if (status & (SII902X_SYS_CTRL_DDC_BUS_REQ |
 986                       SII902X_SYS_CTRL_DDC_BUS_GRTD)) {
 987                 dev_err(dev, "failed to release the i2c bus\n");
 988                 return -ETIMEDOUT;
 989         }
 990
 991         return 0;
 992 }
 993
 994 static const struct drm_bridge_timings default_sii902x_timings = {
 995         .input_bus_flags = DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE
 996                  | DRM_BUS_FLAG_SYNC_SAMPLE_NEGEDGE
 997                  | DRM_BUS_FLAG_DE_HIGH,
 998 };
 999
1000 static int sii902x_init(struct sii902x *sii902x)
1001 {
1002         struct device *dev = &sii902x->i2c->dev;
1003         unsigned int status = 0;
1004         u8 chipid[4];
1005         int ret;
1006
1007         sii902x_reset(sii902x);
1008
1009         ret = regmap_write(sii902x->regmap, SII902X_REG_TPI_RQB, 0x0);
1010         if (ret)
1011                 return ret;
1012
1013         ret = regmap_bulk_read(sii902x->regmap, SII902X_REG_CHIPID(0),
1014                                &chipid, 4);
1015         if (ret) {
1016                 dev_err(dev, "regmap_read failed %d\n", ret);
1017                 return ret;
1018         }
1019
1020         if (chipid[0] != 0xb0) {
1021                 dev_err(dev, "Invalid chipid: %02x (expecting 0xb0)\n",
1022                         chipid[0]);
1023                 return -EINVAL;
1024         }
1025
1026         /* Clear all pending interrupts */
1027         regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);
1028         regmap_write(sii902x->regmap, SII902X_INT_STATUS, status);
1029
1030         if (sii902x->i2c->irq > 0) {
1031                 regmap_write(sii902x->regmap, SII902X_INT_ENABLE,
1032                              SII902X_HOTPLUG_EVENT);
1033
1034                 ret = devm_request_threaded_irq(dev, sii902x->i2c->irq, NULL,
1035                                                 sii902x_interrupt,
1036                                                 IRQF_ONESHOT, dev_name(dev),
1037                                                 sii902x);
1038                 if (ret)
1039                         return ret;
1040         }
1041
1042         sii902x->bridge.funcs = &sii902x_bridge_funcs;
1043         sii902x->bridge.of_node = dev->of_node;
1044         sii902x->bridge.timings = &default_sii902x_timings;
1045         sii902x->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID;
1046
1047         if (sii902x->i2c->irq > 0)
1048                 sii902x->bridge.ops |= DRM_BRIDGE_OP_HPD;
1049
1050         drm_bridge_add(&sii902x->bridge);
1051
1052         sii902x_audio_codec_init(sii902x, dev);
1053
1054         i2c_set_clientdata(sii902x->i2c, sii902x);
1055
1056         sii902x->i2cmux = i2c_mux_alloc(sii902x->i2c->adapter, dev,
1057                                         1, 0, I2C_MUX_GATE,
1058                                         sii902x_i2c_bypass_select,
1059                                         sii902x_i2c_bypass_deselect);
1060         if (!sii902x->i2cmux)
1061                 return -ENOMEM;
1062
1063         sii902x->i2cmux->priv = sii902x;
1064         return i2c_mux_add_adapter(sii902x->i2cmux, 0, 0, 0);
1065 }
1066
1067 static int sii902x_probe(struct i2c_client *client,
1068                          const struct i2c_device_id *id)
1069 {
1070         struct device *dev = &client->dev;
1071         struct device_node *endpoint;
1072         struct sii902x *sii902x;
1073         int ret;
1074
1075         ret = i2c_check_functionality(client->adapter,
1076                                       I2C_FUNC_SMBUS_BYTE_DATA);
1077         if (!ret) {
1078                 dev_err(dev, "I2C adapter not suitable\n");
1079                 return -EIO;
1080         }
1081
1082         sii902x = devm_kzalloc(dev, sizeof(*sii902x), GFP_KERNEL);
1083         if (!sii902x)
1084                 return -ENOMEM;
1085
1086         sii902x->i2c = client;
1087         sii902x->regmap = devm_regmap_init_i2c(client, &sii902x_regmap_config);
1088         if (IS_ERR(sii902x->regmap))
1089                 return PTR_ERR(sii902x->regmap);
1090
1091         sii902x->reset_gpio = devm_gpiod_get_optional(dev, "reset",
1092                                                       GPIOD_OUT_LOW);
1093         if (IS_ERR(sii902x->reset_gpio)) {
1094                 dev_err(dev, "Failed to retrieve/request reset gpio: %ld\n",
1095                         PTR_ERR(sii902x->reset_gpio));
1096                 return PTR_ERR(sii902x->reset_gpio);
1097         }
1098
1099         endpoint = of_graph_get_endpoint_by_regs(dev->of_node, 1, -1);
1100         if (endpoint) {
1101                 struct device_node *remote = of_graph_get_remote_port_parent(endpoint);
1102
1103                 of_node_put(endpoint);
1104                 if (!remote) {
1105                         dev_err(dev, "Endpoint in port@1 unconnected\n");
1106                         return -ENODEV;
1107                 }
1108
1109                 if (!of_device_is_available(remote)) {
1110                         dev_err(dev, "port@1 remote device is disabled\n");
1111                         of_node_put(remote);
1112                         return -ENODEV;
1113                 }
1114
1115                 sii902x->next_bridge = of_drm_find_bridge(remote);
1116                 of_node_put(remote);
1117                 if (!sii902x->next_bridge)
1118                         return -EPROBE_DEFER;
1119         }
1120
1121         mutex_init(&sii902x->mutex);
1122
1123         sii902x->supplies[0].supply = "iovcc";
1124         sii902x->supplies[1].supply = "cvcc12";
1125         ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(sii902x->supplies),
1126                                       sii902x->supplies);
1127         if (ret < 0)
1128                 return ret;
1129
1130         ret = regulator_bulk_enable(ARRAY_SIZE(sii902x->supplies),
1131                                     sii902x->supplies);
1132         if (ret < 0) {
1133                 dev_err_probe(dev, ret, "Failed to enable supplies");
1134                 return ret;
1135         }
1136
1137         ret = sii902x_init(sii902x);
1138         if (ret < 0) {
1139                 regulator_bulk_disable(ARRAY_SIZE(sii902x->supplies),
1140                                        sii902x->supplies);
1141         }
1142
1143         return ret;
1144 }
1145
1146 static int sii902x_remove(struct i2c_client *client)
1147
1148 {
1149         struct sii902x *sii902x = i2c_get_clientdata(client);
1150
1151         i2c_mux_del_adapters(sii902x->i2cmux);
1152         drm_bridge_remove(&sii902x->bridge);
1153         regulator_bulk_disable(ARRAY_SIZE(sii902x->supplies),
1154                                sii902x->supplies);
1155
1156         return 0;
1157 }
1158
1159 static const struct of_device_id sii902x_dt_ids[] = {
1160         { .compatible = "sil,sii9022", },
1161         { }
1162 };
1163 MODULE_DEVICE_TABLE(of, sii902x_dt_ids);
1164
1165 static const struct i2c_device_id sii902x_i2c_ids[] = {
1166         { "sii9022", 0 },
1167         { },
1168 };
1169 MODULE_DEVICE_TABLE(i2c, sii902x_i2c_ids);
1170
1171 static struct i2c_driver sii902x_driver = {
1172         .probe = sii902x_probe,
1173         .remove = sii902x_remove,
1174         .driver = {
1175                 .name = "sii902x",
1176                 .of_match_table = sii902x_dt_ids,
1177         },
1178         .id_table = sii902x_i2c_ids,
1179 };
1180 module_i2c_driver(sii902x_driver);
1181
1182 MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
1183 MODULE_DESCRIPTION("SII902x RGB -> HDMI bridges");
1184 MODULE_LICENSE("GPL");