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 <[email protected]>
   7  *
   8  * Authors:           Bo Shen <[email protected]>
   9  *                    Boris Brezillon <[email protected]>
  10  *                    Wu, Songjun <[email protected]>
  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/media-bus-format.h>
  19 #include <linux/module.h>
  20 #include <linux/regmap.h>
  21 #include <linux/regulator/consumer.h>
  22 #include <linux/clk.h>
  23
  24 #include <drm/drm_atomic_helper.h>
  25 #include <drm/drm_bridge.h>
  26 #include <drm/drm_drv.h>
  27 #include <drm/drm_edid.h>
  28 #include <drm/drm_print.h>
  29 #include <drm/drm_probe_helper.h>
  30
  31 #include <sound/hdmi-codec.h>
  32
  33 #define SII902X_TPI_VIDEO_DATA                  0x0
  34
  35 #define SII902X_TPI_PIXEL_REPETITION            0x8
  36 #define SII902X_TPI_AVI_PIXEL_REP_BUS_24BIT     BIT(5)
  37 #define SII902X_TPI_AVI_PIXEL_REP_RISING_EDGE   BIT(4)
  38 #define SII902X_TPI_AVI_PIXEL_REP_4X            3
  39 #define SII902X_TPI_AVI_PIXEL_REP_2X            1
  40 #define SII902X_TPI_AVI_PIXEL_REP_NONE          0
  41 #define SII902X_TPI_CLK_RATIO_HALF              (0 << 6)
  42 #define SII902X_TPI_CLK_RATIO_1X                (1 << 6)
  43 #define SII902X_TPI_CLK_RATIO_2X                (2 << 6)
  44 #define SII902X_TPI_CLK_RATIO_4X                (3 << 6)
  45
  46 #define SII902X_TPI_AVI_IN_FORMAT               0x9
  47 #define SII902X_TPI_AVI_INPUT_BITMODE_12BIT     BIT(7)
  48 #define SII902X_TPI_AVI_INPUT_DITHER            BIT(6)
  49 #define SII902X_TPI_AVI_INPUT_RANGE_LIMITED     (2 << 2)
  50 #define SII902X_TPI_AVI_INPUT_RANGE_FULL        (1 << 2)
  51 #define SII902X_TPI_AVI_INPUT_RANGE_AUTO        (0 << 2)
  52 #define SII902X_TPI_AVI_INPUT_COLORSPACE_BLACK  (3 << 0)
  53 #define SII902X_TPI_AVI_INPUT_COLORSPACE_YUV422 (2 << 0)
  54 #define SII902X_TPI_AVI_INPUT_COLORSPACE_YUV444 (1 << 0)
  55 #define SII902X_TPI_AVI_INPUT_COLORSPACE_RGB    (0 << 0)
  56
  57 #define SII902X_TPI_AVI_INFOFRAME               0x0c
  58
  59 #define SII902X_SYS_CTRL_DATA                   0x1a
  60 #define SII902X_SYS_CTRL_PWR_DWN                BIT(4)
  61 #define SII902X_SYS_CTRL_AV_MUTE                BIT(3)
  62 #define SII902X_SYS_CTRL_DDC_BUS_REQ            BIT(2)
  63 #define SII902X_SYS_CTRL_DDC_BUS_GRTD           BIT(1)
  64 #define SII902X_SYS_CTRL_OUTPUT_MODE            BIT(0)
  65 #define SII902X_SYS_CTRL_OUTPUT_HDMI            1
  66 #define SII902X_SYS_CTRL_OUTPUT_DVI             0
  67
  68 #define SII902X_REG_CHIPID(n)                   (0x1b + (n))
  69
  70 #define SII902X_PWR_STATE_CTRL                  0x1e
  71 #define SII902X_AVI_POWER_STATE_MSK             GENMASK(1, 0)
  72 #define SII902X_AVI_POWER_STATE_D(l)            ((l) & SII902X_AVI_POWER_STATE_MSK)
  73
  74 /* Audio  */
  75 #define SII902X_TPI_I2S_ENABLE_MAPPING_REG      0x1f
  76 #define SII902X_TPI_I2S_CONFIG_FIFO0                    (0 << 0)
  77 #define SII902X_TPI_I2S_CONFIG_FIFO1                    (1 << 0)
  78 #define SII902X_TPI_I2S_CONFIG_FIFO2                    (2 << 0)
  79 #define SII902X_TPI_I2S_CONFIG_FIFO3                    (3 << 0)
  80 #define SII902X_TPI_I2S_LEFT_RIGHT_SWAP                 (1 << 2)
  81 #define SII902X_TPI_I2S_AUTO_DOWNSAMPLE                 (1 << 3)
  82 #define SII902X_TPI_I2S_SELECT_SD0                      (0 << 4)
  83 #define SII902X_TPI_I2S_SELECT_SD1                      (1 << 4)
  84 #define SII902X_TPI_I2S_SELECT_SD2                      (2 << 4)
  85 #define SII902X_TPI_I2S_SELECT_SD3                      (3 << 4)
  86 #define SII902X_TPI_I2S_FIFO_ENABLE                     (1 << 7)
  87
  88 #define SII902X_TPI_I2S_INPUT_CONFIG_REG        0x20
  89 #define SII902X_TPI_I2S_FIRST_BIT_SHIFT_YES             (0 << 0)
  90 #define SII902X_TPI_I2S_FIRST_BIT_SHIFT_NO              (1 << 0)
  91 #define SII902X_TPI_I2S_SD_DIRECTION_MSB_FIRST          (0 << 1)
  92 #define SII902X_TPI_I2S_SD_DIRECTION_LSB_FIRST          (1 << 1)
  93 #define SII902X_TPI_I2S_SD_JUSTIFY_LEFT                 (0 << 2)
  94 #define SII902X_TPI_I2S_SD_JUSTIFY_RIGHT                (1 << 2)
  95 #define SII902X_TPI_I2S_WS_POLARITY_LOW                 (0 << 3)
  96 #define SII902X_TPI_I2S_WS_POLARITY_HIGH                (1 << 3)
  97 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_128             (0 << 4)
  98 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_256             (1 << 4)
  99 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_384             (2 << 4)
 100 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_512             (3 << 4)
 101 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_768             (4 << 4)
 102 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_1024            (5 << 4)
 103 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_1152            (6 << 4)
 104 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_192             (7 << 4)
 105 #define SII902X_TPI_I2S_SCK_EDGE_FALLING                (0 << 7)
 106 #define SII902X_TPI_I2S_SCK_EDGE_RISING                 (1 << 7)
 107
 108 #define SII902X_TPI_I2S_STRM_HDR_BASE   0x21
 109 #define SII902X_TPI_I2S_STRM_HDR_SIZE   5
 110
 111 #define SII902X_TPI_AUDIO_CONFIG_BYTE2_REG      0x26
 112 #define SII902X_TPI_AUDIO_CODING_STREAM_HEADER          (0 << 0)
 113 #define SII902X_TPI_AUDIO_CODING_PCM                    (1 << 0)
 114 #define SII902X_TPI_AUDIO_CODING_AC3                    (2 << 0)
 115 #define SII902X_TPI_AUDIO_CODING_MPEG1                  (3 << 0)
 116 #define SII902X_TPI_AUDIO_CODING_MP3                    (4 << 0)
 117 #define SII902X_TPI_AUDIO_CODING_MPEG2                  (5 << 0)
 118 #define SII902X_TPI_AUDIO_CODING_AAC                    (6 << 0)
 119 #define SII902X_TPI_AUDIO_CODING_DTS                    (7 << 0)
 120 #define SII902X_TPI_AUDIO_CODING_ATRAC                  (8 << 0)
 121 #define SII902X_TPI_AUDIO_MUTE_DISABLE                  (0 << 4)
 122 #define SII902X_TPI_AUDIO_MUTE_ENABLE                   (1 << 4)
 123 #define SII902X_TPI_AUDIO_LAYOUT_2_CHANNELS             (0 << 5)
 124 #define SII902X_TPI_AUDIO_LAYOUT_8_CHANNELS             (1 << 5)
 125 #define SII902X_TPI_AUDIO_INTERFACE_DISABLE             (0 << 6)
 126 #define SII902X_TPI_AUDIO_INTERFACE_SPDIF               (1 << 6)
 127 #define SII902X_TPI_AUDIO_INTERFACE_I2S                 (2 << 6)
 128
 129 #define SII902X_TPI_AUDIO_CONFIG_BYTE3_REG      0x27
 130 #define SII902X_TPI_AUDIO_FREQ_STREAM                   (0 << 3)
 131 #define SII902X_TPI_AUDIO_FREQ_32KHZ                    (1 << 3)
 132 #define SII902X_TPI_AUDIO_FREQ_44KHZ                    (2 << 3)
 133 #define SII902X_TPI_AUDIO_FREQ_48KHZ                    (3 << 3)
 134 #define SII902X_TPI_AUDIO_FREQ_88KHZ                    (4 << 3)
 135 #define SII902X_TPI_AUDIO_FREQ_96KHZ                    (5 << 3)
 136 #define SII902X_TPI_AUDIO_FREQ_176KHZ                   (6 << 3)
 137 #define SII902X_TPI_AUDIO_FREQ_192KHZ                   (7 << 3)
 138 #define SII902X_TPI_AUDIO_SAMPLE_SIZE_STREAM            (0 << 6)
 139 #define SII902X_TPI_AUDIO_SAMPLE_SIZE_16                (1 << 6)
 140 #define SII902X_TPI_AUDIO_SAMPLE_SIZE_20                (2 << 6)
 141 #define SII902X_TPI_AUDIO_SAMPLE_SIZE_24                (3 << 6)
 142
 143 #define SII902X_TPI_AUDIO_CONFIG_BYTE4_REG      0x28
 144
 145 #define SII902X_INT_ENABLE                      0x3c
 146 #define SII902X_INT_STATUS                      0x3d
 147 #define SII902X_HOTPLUG_EVENT                   BIT(0)
 148 #define SII902X_PLUGGED_STATUS                  BIT(2)
 149
 150 #define SII902X_REG_TPI_RQB                     0xc7
 151
 152 /* Indirect internal register access */
 153 #define SII902X_IND_SET_PAGE                    0xbc
 154 #define SII902X_IND_OFFSET                      0xbd
 155 #define SII902X_IND_VALUE                       0xbe
 156
 157 #define SII902X_TPI_MISC_INFOFRAME_BASE         0xbf
 158 #define SII902X_TPI_MISC_INFOFRAME_END          0xde
 159 #define SII902X_TPI_MISC_INFOFRAME_SIZE \
 160         (SII902X_TPI_MISC_INFOFRAME_END - SII902X_TPI_MISC_INFOFRAME_BASE)
 161
 162 #define SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS  500
 163
 164 #define SII902X_AUDIO_PORT_INDEX                3
 165
 166 struct sii902x {
 167         struct i2c_client *i2c;
 168         struct regmap *regmap;
 169         struct drm_bridge bridge;
 170         struct drm_bridge *next_bridge;
 171         struct drm_connector connector;
 172         struct gpio_desc *reset_gpio;
 173         struct i2c_mux_core *i2cmux;
 174         struct regulator_bulk_data supplies[2];
 175         bool sink_is_hdmi;
 176         /*
 177          * Mutex protects audio and video functions from interfering
 178          * each other, by keeping their i2c command sequences atomic.
 179          */
 180         struct mutex mutex;
 181         struct sii902x_audio {
 182                 struct platform_device *pdev;
 183                 struct clk *mclk;
 184                 u32 i2s_fifo_sequence[4];
 185         } audio;
 186 };
 187
 188 static int sii902x_read_unlocked(struct i2c_client *i2c, u8 reg, u8 *val)
 189 {
 190         union i2c_smbus_data data;
 191         int ret;
 192
 193         ret = __i2c_smbus_xfer(i2c->adapter, i2c->addr, i2c->flags,
 194                                I2C_SMBUS_READ, reg, I2C_SMBUS_BYTE_DATA, &data);
 195
 196         if (ret < 0)
 197                 return ret;
 198
 199         *val = data.byte;
 200         return 0;
 201 }
 202
 203 static int sii902x_write_unlocked(struct i2c_client *i2c, u8 reg, u8 val)
 204 {
 205         union i2c_smbus_data data;
 206
 207         data.byte = val;
 208
 209         return __i2c_smbus_xfer(i2c->adapter, i2c->addr, i2c->flags,
 210                                 I2C_SMBUS_WRITE, reg, I2C_SMBUS_BYTE_DATA,
 211                                 &data);
 212 }
 213
 214 static int sii902x_update_bits_unlocked(struct i2c_client *i2c, u8 reg, u8 mask,
 215                                         u8 val)
 216 {
 217         int ret;
 218         u8 status;
 219
 220         ret = sii902x_read_unlocked(i2c, reg, &status);
 221         if (ret)
 222                 return ret;
 223         status &= ~mask;
 224         status |= val & mask;
 225         return sii902x_write_unlocked(i2c, reg, status);
 226 }
 227
 228 static inline struct sii902x *bridge_to_sii902x(struct drm_bridge *bridge)
 229 {
 230         return container_of(bridge, struct sii902x, bridge);
 231 }
 232
 233 static inline struct sii902x *connector_to_sii902x(struct drm_connector *con)
 234 {
 235         return container_of(con, struct sii902x, connector);
 236 }
 237
 238 static void sii902x_reset(struct sii902x *sii902x)
 239 {
 240         if (!sii902x->reset_gpio)
 241                 return;
 242
 243         gpiod_set_value(sii902x->reset_gpio, 1);
 244
 245         /* The datasheet says treset-min = 100us. Make it 150us to be sure. */
 246         usleep_range(150, 200);
 247
 248         gpiod_set_value(sii902x->reset_gpio, 0);
 249 }
 250
 251 static enum drm_connector_status sii902x_detect(struct sii902x *sii902x)
 252 {
 253         unsigned int status;
 254
 255         mutex_lock(&sii902x->mutex);
 256
 257         regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);
 258
 259         mutex_unlock(&sii902x->mutex);
 260
 261         return (status & SII902X_PLUGGED_STATUS) ?
 262                connector_status_connected : connector_status_disconnected;
 263 }
 264
 265 static enum drm_connector_status
 266 sii902x_connector_detect(struct drm_connector *connector, bool force)
 267 {
 268         struct sii902x *sii902x = connector_to_sii902x(connector);
 269
 270         return sii902x_detect(sii902x);
 271 }
 272
 273 static const struct drm_connector_funcs sii902x_connector_funcs = {
 274         .detect = sii902x_connector_detect,
 275         .fill_modes = drm_helper_probe_single_connector_modes,
 276         .destroy = drm_connector_cleanup,
 277         .reset = drm_atomic_helper_connector_reset,
 278         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 279         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 280 };
 281
 282 static struct edid *sii902x_get_edid(struct sii902x *sii902x,
 283                                      struct drm_connector *connector)
 284 {
 285         struct edid *edid;
 286
 287         mutex_lock(&sii902x->mutex);
 288
 289         edid = drm_get_edid(connector, sii902x->i2cmux->adapter[0]);
 290         if (edid) {
 291                 if (drm_detect_hdmi_monitor(edid))
 292                         sii902x->sink_is_hdmi = true;
 293                 else
 294                         sii902x->sink_is_hdmi = false;
 295         }
 296
 297         mutex_unlock(&sii902x->mutex);
 298
 299         return edid;
 300 }
 301
 302 static int sii902x_get_modes(struct drm_connector *connector)
 303 {
 304         struct sii902x *sii902x = connector_to_sii902x(connector);
 305         struct edid *edid;
 306         int num = 0;
 307
 308         edid = sii902x_get_edid(sii902x, connector);
 309         drm_connector_update_edid_property(connector, edid);
 310         if (edid) {
 311                 num = drm_add_edid_modes(connector, edid);
 312                 kfree(edid);
 313         }
 314
 315         return num;
 316 }
 317
 318 static enum drm_mode_status sii902x_mode_valid(struct drm_connector *connector,
 319                                                struct drm_display_mode *mode)
 320 {
 321         /* TODO: check mode */
 322
 323         return MODE_OK;
 324 }
 325
 326 static const struct drm_connector_helper_funcs sii902x_connector_helper_funcs = {
 327         .get_modes = sii902x_get_modes,
 328         .mode_valid = sii902x_mode_valid,
 329 };
 330
 331 static void sii902x_bridge_disable(struct drm_bridge *bridge)
 332 {
 333         struct sii902x *sii902x = bridge_to_sii902x(bridge);
 334
 335         mutex_lock(&sii902x->mutex);
 336
 337         regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA,
 338                            SII902X_SYS_CTRL_PWR_DWN,
 339                            SII902X_SYS_CTRL_PWR_DWN);
 340
 341         mutex_unlock(&sii902x->mutex);
 342 }
 343
 344 static void sii902x_bridge_enable(struct drm_bridge *bridge)
 345 {
 346         struct sii902x *sii902x = bridge_to_sii902x(bridge);
 347
 348         mutex_lock(&sii902x->mutex);
 349
 350         regmap_update_bits(sii902x->regmap, SII902X_PWR_STATE_CTRL,
 351                            SII902X_AVI_POWER_STATE_MSK,
 352                            SII902X_AVI_POWER_STATE_D(0));
 353         regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA,
 354                            SII902X_SYS_CTRL_PWR_DWN, 0);
 355
 356         mutex_unlock(&sii902x->mutex);
 357 }
 358
 359 static void sii902x_bridge_mode_set(struct drm_bridge *bridge,
 360                                     const struct drm_display_mode *mode,
 361                                     const struct drm_display_mode *adj)
 362 {
 363         struct sii902x *sii902x = bridge_to_sii902x(bridge);
 364         u8 output_mode = SII902X_SYS_CTRL_OUTPUT_DVI;
 365         struct regmap *regmap = sii902x->regmap;
 366         u8 buf[HDMI_INFOFRAME_SIZE(AVI)];
 367         struct hdmi_avi_infoframe frame;
 368         u16 pixel_clock_10kHz = adj->clock / 10;
 369         int ret;
 370
 371         if (sii902x->sink_is_hdmi)
 372                 output_mode = SII902X_SYS_CTRL_OUTPUT_HDMI;
 373
 374         buf[0] = pixel_clock_10kHz & 0xff;
 375         buf[1] = pixel_clock_10kHz >> 8;
 376         buf[2] = drm_mode_vrefresh(adj);
 377         buf[3] = 0x00;
 378         buf[4] = adj->hdisplay;
 379         buf[5] = adj->hdisplay >> 8;
 380         buf[6] = adj->vdisplay;
 381         buf[7] = adj->vdisplay >> 8;
 382         buf[8] = SII902X_TPI_CLK_RATIO_1X | SII902X_TPI_AVI_PIXEL_REP_NONE |
 383                  SII902X_TPI_AVI_PIXEL_REP_BUS_24BIT;
 384         buf[9] = SII902X_TPI_AVI_INPUT_RANGE_AUTO |
 385                  SII902X_TPI_AVI_INPUT_COLORSPACE_RGB;
 386
 387         mutex_lock(&sii902x->mutex);
 388
 389         ret = regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA,
 390                                  SII902X_SYS_CTRL_OUTPUT_MODE, output_mode);
 391         if (ret)
 392                 goto out;
 393
 394         ret = regmap_bulk_write(regmap, SII902X_TPI_VIDEO_DATA, buf, 10);
 395         if (ret)
 396                 goto out;
 397
 398         ret = drm_hdmi_avi_infoframe_from_display_mode(&frame,
 399                                                        &sii902x->connector, adj);
 400         if (ret < 0) {
 401                 DRM_ERROR("couldn't fill AVI infoframe\n");
 402                 goto out;
 403         }
 404
 405         ret = hdmi_avi_infoframe_pack(&frame, buf, sizeof(buf));
 406         if (ret < 0) {
 407                 DRM_ERROR("failed to pack AVI infoframe: %d\n", ret);
 408                 goto out;
 409         }
 410
 411         /* Do not send the infoframe header, but keep the CRC field. */
 412         regmap_bulk_write(regmap, SII902X_TPI_AVI_INFOFRAME,
 413                           buf + HDMI_INFOFRAME_HEADER_SIZE - 1,
 414                           HDMI_AVI_INFOFRAME_SIZE + 1);
 415
 416 out:
 417         mutex_unlock(&sii902x->mutex);
 418 }
 419
 420 static int sii902x_bridge_attach(struct drm_bridge *bridge,
 421                                  enum drm_bridge_attach_flags flags)
 422 {
 423         struct sii902x *sii902x = bridge_to_sii902x(bridge);
 424         u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
 425         struct drm_device *drm = bridge->dev;
 426         int ret;
 427
 428         if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)
 429                 return drm_bridge_attach(bridge->encoder, sii902x->next_bridge,
 430                                          bridge, flags);
 431
 432         drm_connector_helper_add(&sii902x->connector,
 433                                  &sii902x_connector_helper_funcs);
 434
 435         if (!drm_core_check_feature(drm, DRIVER_ATOMIC)) {
 436                 dev_err(&sii902x->i2c->dev,
 437                         "sii902x driver is only compatible with DRM devices supporting atomic updates\n");
 438                 return -ENOTSUPP;
 439         }
 440
 441         ret = drm_connector_init(drm, &sii902x->connector,
 442                                  &sii902x_connector_funcs,
 443                                  DRM_MODE_CONNECTOR_HDMIA);
 444         if (ret)
 445                 return ret;
 446
 447         if (sii902x->i2c->irq > 0)
 448                 sii902x->connector.polled = DRM_CONNECTOR_POLL_HPD;
 449         else
 450                 sii902x->connector.polled = DRM_CONNECTOR_POLL_CONNECT;
 451
 452         ret = drm_display_info_set_bus_formats(&sii902x->connector.display_info,
 453                                                &bus_format, 1);
 454         if (ret)
 455                 return ret;
 456
 457         drm_connector_attach_encoder(&sii902x->connector, bridge->encoder);
 458
 459         return 0;
 460 }
 461
 462 static enum drm_connector_status sii902x_bridge_detect(struct drm_bridge *bridge)
 463 {
 464         struct sii902x *sii902x = bridge_to_sii902x(bridge);
 465
 466         return sii902x_detect(sii902x);
 467 }
 468
 469 static struct edid *sii902x_bridge_get_edid(struct drm_bridge *bridge,
 470                                             struct drm_connector *connector)
 471 {
 472         struct sii902x *sii902x = bridge_to_sii902x(bridge);
 473
 474         return sii902x_get_edid(sii902x, connector);
 475 }
 476
 477 static const struct drm_bridge_funcs sii902x_bridge_funcs = {
 478         .attach = sii902x_bridge_attach,
 479         .mode_set = sii902x_bridge_mode_set,
 480         .disable = sii902x_bridge_disable,
 481         .enable = sii902x_bridge_enable,
 482         .detect = sii902x_bridge_detect,
 483         .get_edid = sii902x_bridge_get_edid,
 484 };
 485
 486 static int sii902x_mute(struct sii902x *sii902x, bool mute)
 487 {
 488         struct device *dev = &sii902x->i2c->dev;
 489         unsigned int val = mute ? SII902X_TPI_AUDIO_MUTE_ENABLE :
 490                 SII902X_TPI_AUDIO_MUTE_DISABLE;
 491
 492         dev_dbg(dev, "%s: %s\n", __func__, mute ? "Muted" : "Unmuted");
 493
 494         return regmap_update_bits(sii902x->regmap,
 495                                   SII902X_TPI_AUDIO_CONFIG_BYTE2_REG,
 496                                   SII902X_TPI_AUDIO_MUTE_ENABLE, val);
 497 }
 498
 499 static const int sii902x_mclk_div_table[] = {
 500         128, 256, 384, 512, 768, 1024, 1152, 192 };
 501
 502 static int sii902x_select_mclk_div(u8 *i2s_config_reg, unsigned int rate,
 503                                    unsigned int mclk)
 504 {
 505         int div = mclk / rate;
 506         int distance = 100000;
 507         u8 i, nearest = 0;
 508
 509         for (i = 0; i < ARRAY_SIZE(sii902x_mclk_div_table); i++) {
 510                 unsigned int d = abs(div - sii902x_mclk_div_table[i]);
 511
 512                 if (d >= distance)
 513                         continue;
 514
 515                 nearest = i;
 516                 distance = d;
 517                 if (d == 0)
 518                         break;
 519         }
 520
 521         *i2s_config_reg |= nearest << 4;
 522
 523         return sii902x_mclk_div_table[nearest];
 524 }
 525
 526 static const struct sii902x_sample_freq {
 527         u32 freq;
 528         u8 val;
 529 } sii902x_sample_freq[] = {
 530         { .freq = 32000,        .val = SII902X_TPI_AUDIO_FREQ_32KHZ },
 531         { .freq = 44000,        .val = SII902X_TPI_AUDIO_FREQ_44KHZ },
 532         { .freq = 48000,        .val = SII902X_TPI_AUDIO_FREQ_48KHZ },
 533         { .freq = 88000,        .val = SII902X_TPI_AUDIO_FREQ_88KHZ },
 534         { .freq = 96000,        .val = SII902X_TPI_AUDIO_FREQ_96KHZ },
 535         { .freq = 176000,       .val = SII902X_TPI_AUDIO_FREQ_176KHZ },
 536         { .freq = 192000,       .val = SII902X_TPI_AUDIO_FREQ_192KHZ },
 537 };
 538
 539 static int sii902x_audio_hw_params(struct device *dev, void *data,
 540                                    struct hdmi_codec_daifmt *daifmt,
 541                                    struct hdmi_codec_params *params)
 542 {
 543         struct sii902x *sii902x = dev_get_drvdata(dev);
 544         u8 i2s_config_reg = SII902X_TPI_I2S_SD_DIRECTION_MSB_FIRST;
 545         u8 config_byte2_reg = (SII902X_TPI_AUDIO_INTERFACE_I2S |
 546                                SII902X_TPI_AUDIO_MUTE_ENABLE |
 547                                SII902X_TPI_AUDIO_CODING_PCM);
 548         u8 config_byte3_reg = 0;
 549         u8 infoframe_buf[HDMI_INFOFRAME_SIZE(AUDIO)];
 550         unsigned long mclk_rate;
 551         int i, ret;
 552
 553         if (daifmt->bit_clk_provider || daifmt->frame_clk_provider) {
 554                 dev_dbg(dev, "%s: I2S clock provider mode not supported\n",
 555                         __func__);
 556                 return -EINVAL;
 557         }
 558
 559         switch (daifmt->fmt) {
 560         case HDMI_I2S:
 561                 i2s_config_reg |= SII902X_TPI_I2S_FIRST_BIT_SHIFT_YES |
 562                         SII902X_TPI_I2S_SD_JUSTIFY_LEFT;
 563                 break;
 564         case HDMI_RIGHT_J:
 565                 i2s_config_reg |= SII902X_TPI_I2S_SD_JUSTIFY_RIGHT;
 566                 break;
 567         case HDMI_LEFT_J:
 568                 i2s_config_reg |= SII902X_TPI_I2S_SD_JUSTIFY_LEFT;
 569                 break;
 570         default:
 571                 dev_dbg(dev, "%s: Unsupported i2s format %u\n", __func__,
 572                         daifmt->fmt);
 573                 return -EINVAL;
 574         }
 575
 576         if (daifmt->bit_clk_inv)
 577                 i2s_config_reg |= SII902X_TPI_I2S_SCK_EDGE_FALLING;
 578         else
 579                 i2s_config_reg |= SII902X_TPI_I2S_SCK_EDGE_RISING;
 580
 581         if (daifmt->frame_clk_inv)
 582                 i2s_config_reg |= SII902X_TPI_I2S_WS_POLARITY_LOW;
 583         else
 584                 i2s_config_reg |= SII902X_TPI_I2S_WS_POLARITY_HIGH;
 585
 586         if (params->channels > 2)
 587                 config_byte2_reg |= SII902X_TPI_AUDIO_LAYOUT_8_CHANNELS;
 588         else
 589                 config_byte2_reg |= SII902X_TPI_AUDIO_LAYOUT_2_CHANNELS;
 590
 591         switch (params->sample_width) {
 592         case 16:
 593                 config_byte3_reg |= SII902X_TPI_AUDIO_SAMPLE_SIZE_16;
 594                 break;
 595         case 20:
 596                 config_byte3_reg |= SII902X_TPI_AUDIO_SAMPLE_SIZE_20;
 597                 break;
 598         case 24:
 599         case 32:
 600                 config_byte3_reg |= SII902X_TPI_AUDIO_SAMPLE_SIZE_24;
 601                 break;
 602         default:
 603                 dev_err(dev, "%s: Unsupported sample width %u\n", __func__,
 604                         params->sample_width);
 605                 return -EINVAL;
 606         }
 607
 608         for (i = 0; i < ARRAY_SIZE(sii902x_sample_freq); i++) {
 609                 if (params->sample_rate == sii902x_sample_freq[i].freq) {
 610                         config_byte3_reg |= sii902x_sample_freq[i].val;
 611                         break;
 612                 }
 613         }
 614
 615         ret = clk_prepare_enable(sii902x->audio.mclk);
 616         if (ret) {
 617                 dev_err(dev, "Enabling mclk failed: %d\n", ret);
 618                 return ret;
 619         }
 620
 621         if (sii902x->audio.mclk) {
 622                 mclk_rate = clk_get_rate(sii902x->audio.mclk);
 623                 ret = sii902x_select_mclk_div(&i2s_config_reg,
 624                                               params->sample_rate, mclk_rate);
 625                 if (mclk_rate != ret * params->sample_rate)
 626                         dev_dbg(dev, "Inaccurate reference clock (%ld/%d != %u)\n",
 627                                 mclk_rate, ret, params->sample_rate);
 628         }
 629
 630         mutex_lock(&sii902x->mutex);
 631
 632         ret = regmap_write(sii902x->regmap,
 633                            SII902X_TPI_AUDIO_CONFIG_BYTE2_REG,
 634                            config_byte2_reg);
 635         if (ret < 0)
 636                 goto out;
 637
 638         ret = regmap_write(sii902x->regmap, SII902X_TPI_I2S_INPUT_CONFIG_REG,
 639                            i2s_config_reg);
 640         if (ret)
 641                 goto out;
 642
 643         for (i = 0; i < ARRAY_SIZE(sii902x->audio.i2s_fifo_sequence) &&
 644                     sii902x->audio.i2s_fifo_sequence[i]; i++)
 645                 regmap_write(sii902x->regmap,
 646                              SII902X_TPI_I2S_ENABLE_MAPPING_REG,
 647                              sii902x->audio.i2s_fifo_sequence[i]);
 648
 649         ret = regmap_write(sii902x->regmap, SII902X_TPI_AUDIO_CONFIG_BYTE3_REG,
 650                            config_byte3_reg);
 651         if (ret)
 652                 goto out;
 653
 654         ret = regmap_bulk_write(sii902x->regmap, SII902X_TPI_I2S_STRM_HDR_BASE,
 655                                 params->iec.status,
 656                                 min((size_t) SII902X_TPI_I2S_STRM_HDR_SIZE,
 657                                     sizeof(params->iec.status)));
 658         if (ret)
 659                 goto out;
 660
 661         ret = hdmi_audio_infoframe_pack(&params->cea, infoframe_buf,
 662                                         sizeof(infoframe_buf));
 663         if (ret < 0) {
 664                 dev_err(dev, "%s: Failed to pack audio infoframe: %d\n",
 665                         __func__, ret);
 666                 goto out;
 667         }
 668
 669         ret = regmap_bulk_write(sii902x->regmap,
 670                                 SII902X_TPI_MISC_INFOFRAME_BASE,
 671                                 infoframe_buf,
 672                                 min(ret, SII902X_TPI_MISC_INFOFRAME_SIZE));
 673         if (ret)
 674                 goto out;
 675
 676         /* Decode Level 0 Packets */
 677         ret = regmap_write(sii902x->regmap, SII902X_IND_SET_PAGE, 0x02);
 678         if (ret)
 679                 goto out;
 680
 681         ret = regmap_write(sii902x->regmap, SII902X_IND_OFFSET, 0x24);
 682         if (ret)
 683                 goto out;
 684
 685         ret = regmap_write(sii902x->regmap, SII902X_IND_VALUE, 0x02);
 686         if (ret)
 687                 goto out;
 688
 689         dev_dbg(dev, "%s: hdmi audio enabled\n", __func__);
 690 out:
 691         mutex_unlock(&sii902x->mutex);
 692
 693         if (ret) {
 694                 clk_disable_unprepare(sii902x->audio.mclk);
 695                 dev_err(dev, "%s: hdmi audio enable failed: %d\n", __func__,
 696                         ret);
 697         }
 698
 699         return ret;
 700 }
 701
 702 static void sii902x_audio_shutdown(struct device *dev, void *data)
 703 {
 704         struct sii902x *sii902x = dev_get_drvdata(dev);
 705
 706         mutex_lock(&sii902x->mutex);
 707
 708         regmap_write(sii902x->regmap, SII902X_TPI_AUDIO_CONFIG_BYTE2_REG,
 709                      SII902X_TPI_AUDIO_INTERFACE_DISABLE);
 710
 711         mutex_unlock(&sii902x->mutex);
 712
 713         clk_disable_unprepare(sii902x->audio.mclk);
 714 }
 715
 716 static int sii902x_audio_mute(struct device *dev, void *data,
 717                               bool enable, int direction)
 718 {
 719         struct sii902x *sii902x = dev_get_drvdata(dev);
 720
 721         mutex_lock(&sii902x->mutex);
 722
 723         sii902x_mute(sii902x, enable);
 724
 725         mutex_unlock(&sii902x->mutex);
 726
 727         return 0;
 728 }
 729
 730 static int sii902x_audio_get_eld(struct device *dev, void *data,
 731                                  uint8_t *buf, size_t len)
 732 {
 733         struct sii902x *sii902x = dev_get_drvdata(dev);
 734
 735         mutex_lock(&sii902x->mutex);
 736
 737         memcpy(buf, sii902x->connector.eld,
 738                min(sizeof(sii902x->connector.eld), len));
 739
 740         mutex_unlock(&sii902x->mutex);
 741
 742         return 0;
 743 }
 744
 745 static int sii902x_audio_get_dai_id(struct snd_soc_component *component,
 746                                     struct device_node *endpoint)
 747 {
 748         struct of_endpoint of_ep;
 749         int ret;
 750
 751         ret = of_graph_parse_endpoint(endpoint, &of_ep);
 752         if (ret < 0)
 753                 return ret;
 754
 755         /*
 756          * HDMI sound should be located at reg = <3>
 757          * Return expected DAI index 0.
 758          */
 759         if (of_ep.port == SII902X_AUDIO_PORT_INDEX)
 760                 return 0;
 761
 762         return -EINVAL;
 763 }
 764
 765 static const struct hdmi_codec_ops sii902x_audio_codec_ops = {
 766         .hw_params = sii902x_audio_hw_params,
 767         .audio_shutdown = sii902x_audio_shutdown,
 768         .mute_stream = sii902x_audio_mute,
 769         .get_eld = sii902x_audio_get_eld,
 770         .get_dai_id = sii902x_audio_get_dai_id,
 771         .no_capture_mute = 1,
 772 };
 773
 774 static int sii902x_audio_codec_init(struct sii902x *sii902x,
 775                                     struct device *dev)
 776 {
 777         static const u8 audio_fifo_id[] = {
 778                 SII902X_TPI_I2S_CONFIG_FIFO0,
 779                 SII902X_TPI_I2S_CONFIG_FIFO1,
 780                 SII902X_TPI_I2S_CONFIG_FIFO2,
 781                 SII902X_TPI_I2S_CONFIG_FIFO3,
 782         };
 783         static const u8 i2s_lane_id[] = {
 784                 SII902X_TPI_I2S_SELECT_SD0,
 785                 SII902X_TPI_I2S_SELECT_SD1,
 786                 SII902X_TPI_I2S_SELECT_SD2,
 787                 SII902X_TPI_I2S_SELECT_SD3,
 788         };
 789         struct hdmi_codec_pdata codec_data = {
 790                 .ops = &sii902x_audio_codec_ops,
 791                 .i2s = 1, /* Only i2s support for now. */
 792                 .spdif = 0,
 793                 .max_i2s_channels = 0,
 794         };
 795         u8 lanes[4];
 796         int num_lanes, i;
 797
 798         if (!of_property_read_bool(dev->of_node, "#sound-dai-cells")) {
 799                 dev_dbg(dev, "%s: No \"#sound-dai-cells\", no audio\n",
 800                         __func__);
 801                 return 0;
 802         }
 803
 804         num_lanes = of_property_read_variable_u8_array(dev->of_node,
 805                                                        "sil,i2s-data-lanes",
 806                                                        lanes, 1,
 807                                                        ARRAY_SIZE(lanes));
 808
 809         if (num_lanes == -EINVAL) {
 810                 dev_dbg(dev,
 811                         "%s: No \"sil,i2s-data-lanes\", use default <0>\n",
 812                         __func__);
 813                 num_lanes = 1;
 814                 lanes[0] = 0;
 815         } else if (num_lanes < 0) {
 816                 dev_err(dev,
 817                         "%s: Error gettin \"sil,i2s-data-lanes\": %d\n",
 818                         __func__, num_lanes);
 819                 return num_lanes;
 820         }
 821         codec_data.max_i2s_channels = 2 * num_lanes;
 822
 823         for (i = 0; i < num_lanes; i++)
 824                 sii902x->audio.i2s_fifo_sequence[i] |= audio_fifo_id[i] |
 825                         i2s_lane_id[lanes[i]] | SII902X_TPI_I2S_FIFO_ENABLE;
 826
 827         sii902x->audio.mclk = devm_clk_get_optional(dev, "mclk");
 828         if (IS_ERR(sii902x->audio.mclk)) {
 829                 dev_err(dev, "%s: No clock (audio mclk) found: %ld\n",
 830                         __func__, PTR_ERR(sii902x->audio.mclk));
 831                 return PTR_ERR(sii902x->audio.mclk);
 832         }
 833
 834         sii902x->audio.pdev = platform_device_register_data(
 835                 dev, HDMI_CODEC_DRV_NAME, PLATFORM_DEVID_AUTO,
 836                 &codec_data, sizeof(codec_data));
 837
 838         return PTR_ERR_OR_ZERO(sii902x->audio.pdev);
 839 }
 840
 841 static const struct regmap_range sii902x_volatile_ranges[] = {
 842         { .range_min = 0, .range_max = 0xff },
 843 };
 844
 845 static const struct regmap_access_table sii902x_volatile_table = {
 846         .yes_ranges = sii902x_volatile_ranges,
 847         .n_yes_ranges = ARRAY_SIZE(sii902x_volatile_ranges),
 848 };
 849
 850 static const struct regmap_config sii902x_regmap_config = {
 851         .reg_bits = 8,
 852         .val_bits = 8,
 853         .disable_locking = true, /* struct sii902x mutex should be enough */
 854         .max_register = SII902X_TPI_MISC_INFOFRAME_END,
 855         .volatile_table = &sii902x_volatile_table,
 856         .cache_type = REGCACHE_NONE,
 857 };
 858
 859 static irqreturn_t sii902x_interrupt(int irq, void *data)
 860 {
 861         struct sii902x *sii902x = data;
 862         unsigned int status = 0;
 863
 864         mutex_lock(&sii902x->mutex);
 865
 866         regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);
 867         regmap_write(sii902x->regmap, SII902X_INT_STATUS, status);
 868
 869         mutex_unlock(&sii902x->mutex);
 870
 871         if ((status & SII902X_HOTPLUG_EVENT) && sii902x->bridge.dev) {
 872                 drm_helper_hpd_irq_event(sii902x->bridge.dev);
 873                 drm_bridge_hpd_notify(&sii902x->bridge, (status & SII902X_PLUGGED_STATUS)
 874                                                                 ? connector_status_connected
 875                                                                 : connector_status_disconnected);
 876         }
 877
 878         return IRQ_HANDLED;
 879 }
 880
 881 /*
 882  * The purpose of sii902x_i2c_bypass_select is to enable the pass through
 883  * mode of the HDMI transmitter. Do not use regmap from within this function,
 884  * only use sii902x_*_unlocked functions to read/modify/write registers.
 885  * We are holding the parent adapter lock here, keep this in mind before
 886  * adding more i2c transactions.
 887  *
 888  * Also, since SII902X_SYS_CTRL_DATA is used with regmap_update_bits elsewhere
 889  * in this driver, we need to make sure that we only touch 0x1A[2:1] from
 890  * within sii902x_i2c_bypass_select and sii902x_i2c_bypass_deselect, and that
 891  * we leave the remaining bits as we have found them.
 892  */
 893 static int sii902x_i2c_bypass_select(struct i2c_mux_core *mux, u32 chan_id)
 894 {
 895         struct sii902x *sii902x = i2c_mux_priv(mux);
 896         struct device *dev = &sii902x->i2c->dev;
 897         unsigned long timeout;
 898         u8 status;
 899         int ret;
 900
 901         ret = sii902x_update_bits_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
 902                                            SII902X_SYS_CTRL_DDC_BUS_REQ,
 903                                            SII902X_SYS_CTRL_DDC_BUS_REQ);
 904         if (ret)
 905                 return ret;
 906
 907         timeout = jiffies +
 908                   msecs_to_jiffies(SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS);
 909         do {
 910                 ret = sii902x_read_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
 911                                             &status);
 912                 if (ret)
 913                         return ret;
 914         } while (!(status & SII902X_SYS_CTRL_DDC_BUS_GRTD) &&
 915                  time_before(jiffies, timeout));
 916
 917         if (!(status & SII902X_SYS_CTRL_DDC_BUS_GRTD)) {
 918                 dev_err(dev, "Failed to acquire the i2c bus\n");
 919                 return -ETIMEDOUT;
 920         }
 921
 922         return sii902x_write_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
 923                                       status);
 924 }
 925
 926 /*
 927  * The purpose of sii902x_i2c_bypass_deselect is to disable the pass through
 928  * mode of the HDMI transmitter. Do not use regmap from within this function,
 929  * only use sii902x_*_unlocked functions to read/modify/write registers.
 930  * We are holding the parent adapter lock here, keep this in mind before
 931  * adding more i2c transactions.
 932  *
 933  * Also, since SII902X_SYS_CTRL_DATA is used with regmap_update_bits elsewhere
 934  * in this driver, we need to make sure that we only touch 0x1A[2:1] from
 935  * within sii902x_i2c_bypass_select and sii902x_i2c_bypass_deselect, and that
 936  * we leave the remaining bits as we have found them.
 937  */
 938 static int sii902x_i2c_bypass_deselect(struct i2c_mux_core *mux, u32 chan_id)
 939 {
 940         struct sii902x *sii902x = i2c_mux_priv(mux);
 941         struct device *dev = &sii902x->i2c->dev;
 942         unsigned long timeout;
 943         unsigned int retries;
 944         u8 status;
 945         int ret;
 946
 947         /*
 948          * When the HDMI transmitter is in pass through mode, we need an
 949          * (undocumented) additional delay between STOP and START conditions
 950          * to guarantee the bus won't get stuck.
 951          */
 952         udelay(30);
 953
 954         /*
 955          * Sometimes the I2C bus can stall after failure to use the
 956          * EDID channel. Retry a few times to see if things clear
 957          * up, else continue anyway.
 958          */
 959         retries = 5;
 960         do {
 961                 ret = sii902x_read_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
 962                                             &status);
 963                 retries--;
 964         } while (ret && retries);
 965         if (ret) {
 966                 dev_err(dev, "failed to read status (%d)\n", ret);
 967                 return ret;
 968         }
 969
 970         ret = sii902x_update_bits_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
 971                                            SII902X_SYS_CTRL_DDC_BUS_REQ |
 972                                            SII902X_SYS_CTRL_DDC_BUS_GRTD, 0);
 973         if (ret)
 974                 return ret;
 975
 976         timeout = jiffies +
 977                   msecs_to_jiffies(SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS);
 978         do {
 979                 ret = sii902x_read_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
 980                                             &status);
 981                 if (ret)
 982                         return ret;
 983         } while (status & (SII902X_SYS_CTRL_DDC_BUS_REQ |
 984                            SII902X_SYS_CTRL_DDC_BUS_GRTD) &&
 985                  time_before(jiffies, timeout));
 986
 987         if (status & (SII902X_SYS_CTRL_DDC_BUS_REQ |
 988                       SII902X_SYS_CTRL_DDC_BUS_GRTD)) {
 989                 dev_err(dev, "failed to release the i2c bus\n");
 990                 return -ETIMEDOUT;
 991         }
 992
 993         return 0;
 994 }
 995
 996 static const struct drm_bridge_timings default_sii902x_timings = {
 997         .input_bus_flags = DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE
 998                  | DRM_BUS_FLAG_SYNC_SAMPLE_NEGEDGE
 999                  | DRM_BUS_FLAG_DE_HIGH,
1000 };
1001
1002 static int sii902x_init(struct sii902x *sii902x)
1003 {
1004         struct device *dev = &sii902x->i2c->dev;
1005         unsigned int status = 0;
1006         u8 chipid[4];
1007         int ret;
1008
1009         sii902x_reset(sii902x);
1010
1011         ret = regmap_write(sii902x->regmap, SII902X_REG_TPI_RQB, 0x0);
1012         if (ret)
1013                 return ret;
1014
1015         ret = regmap_bulk_read(sii902x->regmap, SII902X_REG_CHIPID(0),
1016                                &chipid, 4);
1017         if (ret) {
1018                 dev_err(dev, "regmap_read failed %d\n", ret);
1019                 return ret;
1020         }
1021
1022         if (chipid[0] != 0xb0) {
1023                 dev_err(dev, "Invalid chipid: %02x (expecting 0xb0)\n",
1024                         chipid[0]);
1025                 return -EINVAL;
1026         }
1027
1028         /* Clear all pending interrupts */
1029         regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);
1030         regmap_write(sii902x->regmap, SII902X_INT_STATUS, status);
1031
1032         if (sii902x->i2c->irq > 0) {
1033                 regmap_write(sii902x->regmap, SII902X_INT_ENABLE,
1034                              SII902X_HOTPLUG_EVENT);
1035
1036                 ret = devm_request_threaded_irq(dev, sii902x->i2c->irq, NULL,
1037                                                 sii902x_interrupt,
1038                                                 IRQF_ONESHOT, dev_name(dev),
1039                                                 sii902x);
1040                 if (ret)
1041                         return ret;
1042         }
1043
1044         sii902x->bridge.funcs = &sii902x_bridge_funcs;
1045         sii902x->bridge.of_node = dev->of_node;
1046         sii902x->bridge.timings = &default_sii902x_timings;
1047         sii902x->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID;
1048
1049         if (sii902x->i2c->irq > 0)
1050                 sii902x->bridge.ops |= DRM_BRIDGE_OP_HPD;
1051
1052         drm_bridge_add(&sii902x->bridge);
1053
1054         sii902x_audio_codec_init(sii902x, dev);
1055
1056         i2c_set_clientdata(sii902x->i2c, sii902x);
1057
1058         sii902x->i2cmux = i2c_mux_alloc(sii902x->i2c->adapter, dev,
1059                                         1, 0, I2C_MUX_GATE,
1060                                         sii902x_i2c_bypass_select,
1061                                         sii902x_i2c_bypass_deselect);
1062         if (!sii902x->i2cmux)
1063                 return -ENOMEM;
1064
1065         sii902x->i2cmux->priv = sii902x;
1066         return i2c_mux_add_adapter(sii902x->i2cmux, 0, 0, 0);
1067 }
1068
1069 static int sii902x_probe(struct i2c_client *client,
1070                          const struct i2c_device_id *id)
1071 {
1072         struct device *dev = &client->dev;
1073         struct device_node *endpoint;
1074         struct sii902x *sii902x;
1075         int ret;
1076
1077         ret = i2c_check_functionality(client->adapter,
1078                                       I2C_FUNC_SMBUS_BYTE_DATA);
1079         if (!ret) {
1080                 dev_err(dev, "I2C adapter not suitable\n");
1081                 return -EIO;
1082         }
1083
1084         sii902x = devm_kzalloc(dev, sizeof(*sii902x), GFP_KERNEL);
1085         if (!sii902x)
1086                 return -ENOMEM;
1087
1088         sii902x->i2c = client;
1089         sii902x->regmap = devm_regmap_init_i2c(client, &sii902x_regmap_config);
1090         if (IS_ERR(sii902x->regmap))
1091                 return PTR_ERR(sii902x->regmap);
1092
1093         sii902x->reset_gpio = devm_gpiod_get_optional(dev, "reset",
1094                                                       GPIOD_OUT_LOW);
1095         if (IS_ERR(sii902x->reset_gpio)) {
1096                 dev_err(dev, "Failed to retrieve/request reset gpio: %ld\n",
1097                         PTR_ERR(sii902x->reset_gpio));
1098                 return PTR_ERR(sii902x->reset_gpio);
1099         }
1100
1101         endpoint = of_graph_get_endpoint_by_regs(dev->of_node, 1, -1);
1102         if (endpoint) {
1103                 struct device_node *remote = of_graph_get_remote_port_parent(endpoint);
1104
1105                 of_node_put(endpoint);
1106                 if (!remote) {
1107                         dev_err(dev, "Endpoint in port@1 unconnected\n");
1108                         return -ENODEV;
1109                 }
1110
1111                 if (!of_device_is_available(remote)) {
1112                         dev_err(dev, "port@1 remote device is disabled\n");
1113                         of_node_put(remote);
1114                         return -ENODEV;
1115                 }
1116
1117                 sii902x->next_bridge = of_drm_find_bridge(remote);
1118                 of_node_put(remote);
1119                 if (!sii902x->next_bridge)
1120                         return -EPROBE_DEFER;
1121         }
1122
1123         mutex_init(&sii902x->mutex);
1124
1125         sii902x->supplies[0].supply = "iovcc";
1126         sii902x->supplies[1].supply = "cvcc12";
1127         ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(sii902x->supplies),
1128                                       sii902x->supplies);
1129         if (ret < 0)
1130                 return ret;
1131
1132         ret = regulator_bulk_enable(ARRAY_SIZE(sii902x->supplies),
1133                                     sii902x->supplies);
1134         if (ret < 0) {
1135                 dev_err_probe(dev, ret, "Failed to enable supplies");
1136                 return ret;
1137         }
1138
1139         ret = sii902x_init(sii902x);
1140         if (ret < 0) {
1141                 regulator_bulk_disable(ARRAY_SIZE(sii902x->supplies),
1142                                        sii902x->supplies);
1143         }
1144
1145         return ret;
1146 }
1147
1148 static int sii902x_remove(struct i2c_client *client)
1149
1150 {
1151         struct sii902x *sii902x = i2c_get_clientdata(client);
1152
1153         i2c_mux_del_adapters(sii902x->i2cmux);
1154         drm_bridge_remove(&sii902x->bridge);
1155         regulator_bulk_disable(ARRAY_SIZE(sii902x->supplies),
1156                                sii902x->supplies);
1157
1158         return 0;
1159 }
1160
1161 static const struct of_device_id sii902x_dt_ids[] = {
1162         { .compatible = "sil,sii9022", },
1163         { }
1164 };
1165 MODULE_DEVICE_TABLE(of, sii902x_dt_ids);
1166
1167 static const struct i2c_device_id sii902x_i2c_ids[] = {
1168         { "sii9022", 0 },
1169         { },
1170 };
1171 MODULE_DEVICE_TABLE(i2c, sii902x_i2c_ids);
1172
1173 static struct i2c_driver sii902x_driver = {
1174         .probe = sii902x_probe,
1175         .remove = sii902x_remove,
1176         .driver = {
1177                 .name = "sii902x",
1178                 .of_match_table = sii902x_dt_ids,
1179         },
1180         .id_table = sii902x_i2c_ids,
1181 };
1182 module_i2c_driver(sii902x_driver);
1183
1184 MODULE_AUTHOR("Boris Brezillon <[email protected]>");
1185 MODULE_DESCRIPTION("SII902x RGB -> HDMI bridges");
1186 MODULE_LICENSE("GPL");