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