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OSCL-LXR
 
 

     

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * Copyright (C) 2018 Renesas Electronics
0004  *
0005  * Copyright (C) 2016 Atmel
0006  *            Bo Shen <voice.shen@atmel.com>
0007  *
0008  * Authors:       Bo Shen <voice.shen@atmel.com>
0009  *            Boris Brezillon <boris.brezillon@free-electrons.com>
0010  *            Wu, Songjun <Songjun.Wu@atmel.com>
0011  *
0012  * Copyright (C) 2010-2011 Freescale Semiconductor, Inc. All Rights Reserved.
0013  */
0014 
0015 #include <linux/gpio/consumer.h>
0016 #include <linux/i2c-mux.h>
0017 #include <linux/i2c.h>
0018 #include <linux/media-bus-format.h>
0019 #include <linux/module.h>
0020 #include <linux/regmap.h>
0021 #include <linux/regulator/consumer.h>
0022 #include <linux/clk.h>
0023 
0024 #include <drm/drm_atomic_helper.h>
0025 #include <drm/drm_bridge.h>
0026 #include <drm/drm_drv.h>
0027 #include <drm/drm_edid.h>
0028 #include <drm/drm_print.h>
0029 #include <drm/drm_probe_helper.h>
0030 
0031 #include <sound/hdmi-codec.h>
0032 
0033 #define SII902X_TPI_VIDEO_DATA          0x0
0034 
0035 #define SII902X_TPI_PIXEL_REPETITION        0x8
0036 #define SII902X_TPI_AVI_PIXEL_REP_BUS_24BIT     BIT(5)
0037 #define SII902X_TPI_AVI_PIXEL_REP_RISING_EDGE   BIT(4)
0038 #define SII902X_TPI_AVI_PIXEL_REP_4X        3
0039 #define SII902X_TPI_AVI_PIXEL_REP_2X        1
0040 #define SII902X_TPI_AVI_PIXEL_REP_NONE      0
0041 #define SII902X_TPI_CLK_RATIO_HALF      (0 << 6)
0042 #define SII902X_TPI_CLK_RATIO_1X        (1 << 6)
0043 #define SII902X_TPI_CLK_RATIO_2X        (2 << 6)
0044 #define SII902X_TPI_CLK_RATIO_4X        (3 << 6)
0045 
0046 #define SII902X_TPI_AVI_IN_FORMAT       0x9
0047 #define SII902X_TPI_AVI_INPUT_BITMODE_12BIT BIT(7)
0048 #define SII902X_TPI_AVI_INPUT_DITHER        BIT(6)
0049 #define SII902X_TPI_AVI_INPUT_RANGE_LIMITED (2 << 2)
0050 #define SII902X_TPI_AVI_INPUT_RANGE_FULL    (1 << 2)
0051 #define SII902X_TPI_AVI_INPUT_RANGE_AUTO    (0 << 2)
0052 #define SII902X_TPI_AVI_INPUT_COLORSPACE_BLACK  (3 << 0)
0053 #define SII902X_TPI_AVI_INPUT_COLORSPACE_YUV422 (2 << 0)
0054 #define SII902X_TPI_AVI_INPUT_COLORSPACE_YUV444 (1 << 0)
0055 #define SII902X_TPI_AVI_INPUT_COLORSPACE_RGB    (0 << 0)
0056 
0057 #define SII902X_TPI_AVI_INFOFRAME       0x0c
0058 
0059 #define SII902X_SYS_CTRL_DATA           0x1a
0060 #define SII902X_SYS_CTRL_PWR_DWN        BIT(4)
0061 #define SII902X_SYS_CTRL_AV_MUTE        BIT(3)
0062 #define SII902X_SYS_CTRL_DDC_BUS_REQ        BIT(2)
0063 #define SII902X_SYS_CTRL_DDC_BUS_GRTD       BIT(1)
0064 #define SII902X_SYS_CTRL_OUTPUT_MODE        BIT(0)
0065 #define SII902X_SYS_CTRL_OUTPUT_HDMI        1
0066 #define SII902X_SYS_CTRL_OUTPUT_DVI     0
0067 
0068 #define SII902X_REG_CHIPID(n)           (0x1b + (n))
0069 
0070 #define SII902X_PWR_STATE_CTRL          0x1e
0071 #define SII902X_AVI_POWER_STATE_MSK     GENMASK(1, 0)
0072 #define SII902X_AVI_POWER_STATE_D(l)        ((l) & SII902X_AVI_POWER_STATE_MSK)
0073 
0074 /* Audio  */
0075 #define SII902X_TPI_I2S_ENABLE_MAPPING_REG  0x1f
0076 #define SII902X_TPI_I2S_CONFIG_FIFO0            (0 << 0)
0077 #define SII902X_TPI_I2S_CONFIG_FIFO1            (1 << 0)
0078 #define SII902X_TPI_I2S_CONFIG_FIFO2            (2 << 0)
0079 #define SII902X_TPI_I2S_CONFIG_FIFO3            (3 << 0)
0080 #define SII902X_TPI_I2S_LEFT_RIGHT_SWAP         (1 << 2)
0081 #define SII902X_TPI_I2S_AUTO_DOWNSAMPLE         (1 << 3)
0082 #define SII902X_TPI_I2S_SELECT_SD0          (0 << 4)
0083 #define SII902X_TPI_I2S_SELECT_SD1          (1 << 4)
0084 #define SII902X_TPI_I2S_SELECT_SD2          (2 << 4)
0085 #define SII902X_TPI_I2S_SELECT_SD3          (3 << 4)
0086 #define SII902X_TPI_I2S_FIFO_ENABLE         (1 << 7)
0087 
0088 #define SII902X_TPI_I2S_INPUT_CONFIG_REG    0x20
0089 #define SII902X_TPI_I2S_FIRST_BIT_SHIFT_YES     (0 << 0)
0090 #define SII902X_TPI_I2S_FIRST_BIT_SHIFT_NO      (1 << 0)
0091 #define SII902X_TPI_I2S_SD_DIRECTION_MSB_FIRST      (0 << 1)
0092 #define SII902X_TPI_I2S_SD_DIRECTION_LSB_FIRST      (1 << 1)
0093 #define SII902X_TPI_I2S_SD_JUSTIFY_LEFT         (0 << 2)
0094 #define SII902X_TPI_I2S_SD_JUSTIFY_RIGHT        (1 << 2)
0095 #define SII902X_TPI_I2S_WS_POLARITY_LOW         (0 << 3)
0096 #define SII902X_TPI_I2S_WS_POLARITY_HIGH        (1 << 3)
0097 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_128     (0 << 4)
0098 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_256     (1 << 4)
0099 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_384     (2 << 4)
0100 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_512     (3 << 4)
0101 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_768     (4 << 4)
0102 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_1024        (5 << 4)
0103 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_1152        (6 << 4)
0104 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_192     (7 << 4)
0105 #define SII902X_TPI_I2S_SCK_EDGE_FALLING        (0 << 7)
0106 #define SII902X_TPI_I2S_SCK_EDGE_RISING         (1 << 7)
0107 
0108 #define SII902X_TPI_I2S_STRM_HDR_BASE   0x21
0109 #define SII902X_TPI_I2S_STRM_HDR_SIZE   5
0110 
0111 #define SII902X_TPI_AUDIO_CONFIG_BYTE2_REG  0x26
0112 #define SII902X_TPI_AUDIO_CODING_STREAM_HEADER      (0 << 0)
0113 #define SII902X_TPI_AUDIO_CODING_PCM            (1 << 0)
0114 #define SII902X_TPI_AUDIO_CODING_AC3            (2 << 0)
0115 #define SII902X_TPI_AUDIO_CODING_MPEG1          (3 << 0)
0116 #define SII902X_TPI_AUDIO_CODING_MP3            (4 << 0)
0117 #define SII902X_TPI_AUDIO_CODING_MPEG2          (5 << 0)
0118 #define SII902X_TPI_AUDIO_CODING_AAC            (6 << 0)
0119 #define SII902X_TPI_AUDIO_CODING_DTS            (7 << 0)
0120 #define SII902X_TPI_AUDIO_CODING_ATRAC          (8 << 0)
0121 #define SII902X_TPI_AUDIO_MUTE_DISABLE          (0 << 4)
0122 #define SII902X_TPI_AUDIO_MUTE_ENABLE           (1 << 4)
0123 #define SII902X_TPI_AUDIO_LAYOUT_2_CHANNELS     (0 << 5)
0124 #define SII902X_TPI_AUDIO_LAYOUT_8_CHANNELS     (1 << 5)
0125 #define SII902X_TPI_AUDIO_INTERFACE_DISABLE     (0 << 6)
0126 #define SII902X_TPI_AUDIO_INTERFACE_SPDIF       (1 << 6)
0127 #define SII902X_TPI_AUDIO_INTERFACE_I2S         (2 << 6)
0128 
0129 #define SII902X_TPI_AUDIO_CONFIG_BYTE3_REG  0x27
0130 #define SII902X_TPI_AUDIO_FREQ_STREAM           (0 << 3)
0131 #define SII902X_TPI_AUDIO_FREQ_32KHZ            (1 << 3)
0132 #define SII902X_TPI_AUDIO_FREQ_44KHZ            (2 << 3)
0133 #define SII902X_TPI_AUDIO_FREQ_48KHZ            (3 << 3)
0134 #define SII902X_TPI_AUDIO_FREQ_88KHZ            (4 << 3)
0135 #define SII902X_TPI_AUDIO_FREQ_96KHZ            (5 << 3)
0136 #define SII902X_TPI_AUDIO_FREQ_176KHZ           (6 << 3)
0137 #define SII902X_TPI_AUDIO_FREQ_192KHZ           (7 << 3)
0138 #define SII902X_TPI_AUDIO_SAMPLE_SIZE_STREAM        (0 << 6)
0139 #define SII902X_TPI_AUDIO_SAMPLE_SIZE_16        (1 << 6)
0140 #define SII902X_TPI_AUDIO_SAMPLE_SIZE_20        (2 << 6)
0141 #define SII902X_TPI_AUDIO_SAMPLE_SIZE_24        (3 << 6)
0142 
0143 #define SII902X_TPI_AUDIO_CONFIG_BYTE4_REG  0x28
0144 
0145 #define SII902X_INT_ENABLE          0x3c
0146 #define SII902X_INT_STATUS          0x3d
0147 #define SII902X_HOTPLUG_EVENT           BIT(0)
0148 #define SII902X_PLUGGED_STATUS          BIT(2)
0149 
0150 #define SII902X_REG_TPI_RQB         0xc7
0151 
0152 /* Indirect internal register access */
0153 #define SII902X_IND_SET_PAGE            0xbc
0154 #define SII902X_IND_OFFSET          0xbd
0155 #define SII902X_IND_VALUE           0xbe
0156 
0157 #define SII902X_TPI_MISC_INFOFRAME_BASE     0xbf
0158 #define SII902X_TPI_MISC_INFOFRAME_END      0xde
0159 #define SII902X_TPI_MISC_INFOFRAME_SIZE \
0160     (SII902X_TPI_MISC_INFOFRAME_END - SII902X_TPI_MISC_INFOFRAME_BASE)
0161 
0162 #define SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS  500
0163 
0164 #define SII902X_AUDIO_PORT_INDEX        3
0165 
0166 struct sii902x {
0167     struct i2c_client *i2c;
0168     struct regmap *regmap;
0169     struct drm_bridge bridge;
0170     struct drm_bridge *next_bridge;
0171     struct drm_connector connector;
0172     struct gpio_desc *reset_gpio;
0173     struct i2c_mux_core *i2cmux;
0174     struct regulator_bulk_data supplies[2];
0175     bool sink_is_hdmi;
0176     /*
0177      * Mutex protects audio and video functions from interfering
0178      * each other, by keeping their i2c command sequences atomic.
0179      */
0180     struct mutex mutex;
0181     struct sii902x_audio {
0182         struct platform_device *pdev;
0183         struct clk *mclk;
0184         u32 i2s_fifo_sequence[4];
0185     } audio;
0186 };
0187 
0188 static int sii902x_read_unlocked(struct i2c_client *i2c, u8 reg, u8 *val)
0189 {
0190     union i2c_smbus_data data;
0191     int ret;
0192 
0193     ret = __i2c_smbus_xfer(i2c->adapter, i2c->addr, i2c->flags,
0194                    I2C_SMBUS_READ, reg, I2C_SMBUS_BYTE_DATA, &data);
0195 
0196     if (ret < 0)
0197         return ret;
0198 
0199     *val = data.byte;
0200     return 0;
0201 }
0202 
0203 static int sii902x_write_unlocked(struct i2c_client *i2c, u8 reg, u8 val)
0204 {
0205     union i2c_smbus_data data;
0206 
0207     data.byte = val;
0208 
0209     return __i2c_smbus_xfer(i2c->adapter, i2c->addr, i2c->flags,
0210                 I2C_SMBUS_WRITE, reg, I2C_SMBUS_BYTE_DATA,
0211                 &data);
0212 }
0213 
0214 static int sii902x_update_bits_unlocked(struct i2c_client *i2c, u8 reg, u8 mask,
0215                     u8 val)
0216 {
0217     int ret;
0218     u8 status;
0219 
0220     ret = sii902x_read_unlocked(i2c, reg, &status);
0221     if (ret)
0222         return ret;
0223     status &= ~mask;
0224     status |= val & mask;
0225     return sii902x_write_unlocked(i2c, reg, status);
0226 }
0227 
0228 static inline struct sii902x *bridge_to_sii902x(struct drm_bridge *bridge)
0229 {
0230     return container_of(bridge, struct sii902x, bridge);
0231 }
0232 
0233 static inline struct sii902x *connector_to_sii902x(struct drm_connector *con)
0234 {
0235     return container_of(con, struct sii902x, connector);
0236 }
0237 
0238 static void sii902x_reset(struct sii902x *sii902x)
0239 {
0240     if (!sii902x->reset_gpio)
0241         return;
0242 
0243     gpiod_set_value(sii902x->reset_gpio, 1);
0244 
0245     /* The datasheet says treset-min = 100us. Make it 150us to be sure. */
0246     usleep_range(150, 200);
0247 
0248     gpiod_set_value(sii902x->reset_gpio, 0);
0249 }
0250 
0251 static enum drm_connector_status sii902x_detect(struct sii902x *sii902x)
0252 {
0253     unsigned int status;
0254 
0255     mutex_lock(&sii902x->mutex);
0256 
0257     regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);
0258 
0259     mutex_unlock(&sii902x->mutex);
0260 
0261     return (status & SII902X_PLUGGED_STATUS) ?
0262            connector_status_connected : connector_status_disconnected;
0263 }
0264 
0265 static enum drm_connector_status
0266 sii902x_connector_detect(struct drm_connector *connector, bool force)
0267 {
0268     struct sii902x *sii902x = connector_to_sii902x(connector);
0269 
0270     return sii902x_detect(sii902x);
0271 }
0272 
0273 static const struct drm_connector_funcs sii902x_connector_funcs = {
0274     .detect = sii902x_connector_detect,
0275     .fill_modes = drm_helper_probe_single_connector_modes,
0276     .destroy = drm_connector_cleanup,
0277     .reset = drm_atomic_helper_connector_reset,
0278     .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
0279     .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
0280 };
0281 
0282 static struct edid *sii902x_get_edid(struct sii902x *sii902x,
0283                      struct drm_connector *connector)
0284 {
0285     struct edid *edid;
0286 
0287     mutex_lock(&sii902x->mutex);
0288 
0289     edid = drm_get_edid(connector, sii902x->i2cmux->adapter[0]);
0290     if (edid) {
0291         if (drm_detect_hdmi_monitor(edid))
0292             sii902x->sink_is_hdmi = true;
0293         else
0294             sii902x->sink_is_hdmi = false;
0295     }
0296 
0297     mutex_unlock(&sii902x->mutex);
0298 
0299     return edid;
0300 }
0301 
0302 static int sii902x_get_modes(struct drm_connector *connector)
0303 {
0304     struct sii902x *sii902x = connector_to_sii902x(connector);
0305     struct edid *edid;
0306     int num = 0;
0307 
0308     edid = sii902x_get_edid(sii902x, connector);
0309     drm_connector_update_edid_property(connector, edid);
0310     if (edid) {
0311         num = drm_add_edid_modes(connector, edid);
0312         kfree(edid);
0313     }
0314 
0315     return num;
0316 }
0317 
0318 static enum drm_mode_status sii902x_mode_valid(struct drm_connector *connector,
0319                            struct drm_display_mode *mode)
0320 {
0321     /* TODO: check mode */
0322 
0323     return MODE_OK;
0324 }
0325 
0326 static const struct drm_connector_helper_funcs sii902x_connector_helper_funcs = {
0327     .get_modes = sii902x_get_modes,
0328     .mode_valid = sii902x_mode_valid,
0329 };
0330 
0331 static void sii902x_bridge_disable(struct drm_bridge *bridge)
0332 {
0333     struct sii902x *sii902x = bridge_to_sii902x(bridge);
0334 
0335     mutex_lock(&sii902x->mutex);
0336 
0337     regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA,
0338                SII902X_SYS_CTRL_PWR_DWN,
0339                SII902X_SYS_CTRL_PWR_DWN);
0340 
0341     mutex_unlock(&sii902x->mutex);
0342 }
0343 
0344 static void sii902x_bridge_enable(struct drm_bridge *bridge)
0345 {
0346     struct sii902x *sii902x = bridge_to_sii902x(bridge);
0347 
0348     mutex_lock(&sii902x->mutex);
0349 
0350     regmap_update_bits(sii902x->regmap, SII902X_PWR_STATE_CTRL,
0351                SII902X_AVI_POWER_STATE_MSK,
0352                SII902X_AVI_POWER_STATE_D(0));
0353     regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA,
0354                SII902X_SYS_CTRL_PWR_DWN, 0);
0355 
0356     mutex_unlock(&sii902x->mutex);
0357 }
0358 
0359 static void sii902x_bridge_mode_set(struct drm_bridge *bridge,
0360                     const struct drm_display_mode *mode,
0361                     const struct drm_display_mode *adj)
0362 {
0363     struct sii902x *sii902x = bridge_to_sii902x(bridge);
0364     u8 output_mode = SII902X_SYS_CTRL_OUTPUT_DVI;
0365     struct regmap *regmap = sii902x->regmap;
0366     u8 buf[HDMI_INFOFRAME_SIZE(AVI)];
0367     struct hdmi_avi_infoframe frame;
0368     u16 pixel_clock_10kHz = adj->clock / 10;
0369     int ret;
0370 
0371     if (sii902x->sink_is_hdmi)
0372         output_mode = SII902X_SYS_CTRL_OUTPUT_HDMI;
0373 
0374     buf[0] = pixel_clock_10kHz & 0xff;
0375     buf[1] = pixel_clock_10kHz >> 8;
0376     buf[2] = drm_mode_vrefresh(adj);
0377     buf[3] = 0x00;
0378     buf[4] = adj->hdisplay;
0379     buf[5] = adj->hdisplay >> 8;
0380     buf[6] = adj->vdisplay;
0381     buf[7] = adj->vdisplay >> 8;
0382     buf[8] = SII902X_TPI_CLK_RATIO_1X | SII902X_TPI_AVI_PIXEL_REP_NONE |
0383          SII902X_TPI_AVI_PIXEL_REP_BUS_24BIT;
0384     buf[9] = SII902X_TPI_AVI_INPUT_RANGE_AUTO |
0385          SII902X_TPI_AVI_INPUT_COLORSPACE_RGB;
0386 
0387     mutex_lock(&sii902x->mutex);
0388 
0389     ret = regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA,
0390                  SII902X_SYS_CTRL_OUTPUT_MODE, output_mode);
0391     if (ret)
0392         goto out;
0393 
0394     ret = regmap_bulk_write(regmap, SII902X_TPI_VIDEO_DATA, buf, 10);
0395     if (ret)
0396         goto out;
0397 
0398     ret = drm_hdmi_avi_infoframe_from_display_mode(&frame,
0399                                &sii902x->connector, adj);
0400     if (ret < 0) {
0401         DRM_ERROR("couldn't fill AVI infoframe\n");
0402         goto out;
0403     }
0404 
0405     ret = hdmi_avi_infoframe_pack(&frame, buf, sizeof(buf));
0406     if (ret < 0) {
0407         DRM_ERROR("failed to pack AVI infoframe: %d\n", ret);
0408         goto out;
0409     }
0410 
0411     /* Do not send the infoframe header, but keep the CRC field. */
0412     regmap_bulk_write(regmap, SII902X_TPI_AVI_INFOFRAME,
0413               buf + HDMI_INFOFRAME_HEADER_SIZE - 1,
0414               HDMI_AVI_INFOFRAME_SIZE + 1);
0415 
0416 out:
0417     mutex_unlock(&sii902x->mutex);
0418 }
0419 
0420 static int sii902x_bridge_attach(struct drm_bridge *bridge,
0421                  enum drm_bridge_attach_flags flags)
0422 {
0423     struct sii902x *sii902x = bridge_to_sii902x(bridge);
0424     u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
0425     struct drm_device *drm = bridge->dev;
0426     int ret;
0427 
0428     if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)
0429         return drm_bridge_attach(bridge->encoder, sii902x->next_bridge,
0430                      bridge, flags);
0431 
0432     drm_connector_helper_add(&sii902x->connector,
0433                  &sii902x_connector_helper_funcs);
0434 
0435     if (!drm_core_check_feature(drm, DRIVER_ATOMIC)) {
0436         dev_err(&sii902x->i2c->dev,
0437             "sii902x driver is only compatible with DRM devices supporting atomic updates\n");
0438         return -ENOTSUPP;
0439     }
0440 
0441     ret = drm_connector_init(drm, &sii902x->connector,
0442                  &sii902x_connector_funcs,
0443                  DRM_MODE_CONNECTOR_HDMIA);
0444     if (ret)
0445         return ret;
0446 
0447     if (sii902x->i2c->irq > 0)
0448         sii902x->connector.polled = DRM_CONNECTOR_POLL_HPD;
0449     else
0450         sii902x->connector.polled = DRM_CONNECTOR_POLL_CONNECT;
0451 
0452     ret = drm_display_info_set_bus_formats(&sii902x->connector.display_info,
0453                            &bus_format, 1);
0454     if (ret)
0455         return ret;
0456 
0457     drm_connector_attach_encoder(&sii902x->connector, bridge->encoder);
0458 
0459     return 0;
0460 }
0461 
0462 static enum drm_connector_status sii902x_bridge_detect(struct drm_bridge *bridge)
0463 {
0464     struct sii902x *sii902x = bridge_to_sii902x(bridge);
0465 
0466     return sii902x_detect(sii902x);
0467 }
0468 
0469 static struct edid *sii902x_bridge_get_edid(struct drm_bridge *bridge,
0470                         struct drm_connector *connector)
0471 {
0472     struct sii902x *sii902x = bridge_to_sii902x(bridge);
0473 
0474     return sii902x_get_edid(sii902x, connector);
0475 }
0476 
0477 static const struct drm_bridge_funcs sii902x_bridge_funcs = {
0478     .attach = sii902x_bridge_attach,
0479     .mode_set = sii902x_bridge_mode_set,
0480     .disable = sii902x_bridge_disable,
0481     .enable = sii902x_bridge_enable,
0482     .detect = sii902x_bridge_detect,
0483     .get_edid = sii902x_bridge_get_edid,
0484 };
0485 
0486 static int sii902x_mute(struct sii902x *sii902x, bool mute)
0487 {
0488     struct device *dev = &sii902x->i2c->dev;
0489     unsigned int val = mute ? SII902X_TPI_AUDIO_MUTE_ENABLE :
0490         SII902X_TPI_AUDIO_MUTE_DISABLE;
0491 
0492     dev_dbg(dev, "%s: %s\n", __func__, mute ? "Muted" : "Unmuted");
0493 
0494     return regmap_update_bits(sii902x->regmap,
0495                   SII902X_TPI_AUDIO_CONFIG_BYTE2_REG,
0496                   SII902X_TPI_AUDIO_MUTE_ENABLE, val);
0497 }
0498 
0499 static const int sii902x_mclk_div_table[] = {
0500     128, 256, 384, 512, 768, 1024, 1152, 192 };
0501 
0502 static int sii902x_select_mclk_div(u8 *i2s_config_reg, unsigned int rate,
0503                    unsigned int mclk)
0504 {
0505     int div = mclk / rate;
0506     int distance = 100000;
0507     u8 i, nearest = 0;
0508 
0509     for (i = 0; i < ARRAY_SIZE(sii902x_mclk_div_table); i++) {
0510         unsigned int d = abs(div - sii902x_mclk_div_table[i]);
0511 
0512         if (d >= distance)
0513             continue;
0514 
0515         nearest = i;
0516         distance = d;
0517         if (d == 0)
0518             break;
0519     }
0520 
0521     *i2s_config_reg |= nearest << 4;
0522 
0523     return sii902x_mclk_div_table[nearest];
0524 }
0525 
0526 static const struct sii902x_sample_freq {
0527     u32 freq;
0528     u8 val;
0529 } sii902x_sample_freq[] = {
0530     { .freq = 32000,    .val = SII902X_TPI_AUDIO_FREQ_32KHZ },
0531     { .freq = 44000,    .val = SII902X_TPI_AUDIO_FREQ_44KHZ },
0532     { .freq = 48000,    .val = SII902X_TPI_AUDIO_FREQ_48KHZ },
0533     { .freq = 88000,    .val = SII902X_TPI_AUDIO_FREQ_88KHZ },
0534     { .freq = 96000,    .val = SII902X_TPI_AUDIO_FREQ_96KHZ },
0535     { .freq = 176000,   .val = SII902X_TPI_AUDIO_FREQ_176KHZ },
0536     { .freq = 192000,   .val = SII902X_TPI_AUDIO_FREQ_192KHZ },
0537 };
0538 
0539 static int sii902x_audio_hw_params(struct device *dev, void *data,
0540                    struct hdmi_codec_daifmt *daifmt,
0541                    struct hdmi_codec_params *params)
0542 {
0543     struct sii902x *sii902x = dev_get_drvdata(dev);
0544     u8 i2s_config_reg = SII902X_TPI_I2S_SD_DIRECTION_MSB_FIRST;
0545     u8 config_byte2_reg = (SII902X_TPI_AUDIO_INTERFACE_I2S |
0546                    SII902X_TPI_AUDIO_MUTE_ENABLE |
0547                    SII902X_TPI_AUDIO_CODING_PCM);
0548     u8 config_byte3_reg = 0;
0549     u8 infoframe_buf[HDMI_INFOFRAME_SIZE(AUDIO)];
0550     unsigned long mclk_rate;
0551     int i, ret;
0552 
0553     if (daifmt->bit_clk_provider || daifmt->frame_clk_provider) {
0554         dev_dbg(dev, "%s: I2S clock provider mode not supported\n",
0555             __func__);
0556         return -EINVAL;
0557     }
0558 
0559     switch (daifmt->fmt) {
0560     case HDMI_I2S:
0561         i2s_config_reg |= SII902X_TPI_I2S_FIRST_BIT_SHIFT_YES |
0562             SII902X_TPI_I2S_SD_JUSTIFY_LEFT;
0563         break;
0564     case HDMI_RIGHT_J:
0565         i2s_config_reg |= SII902X_TPI_I2S_SD_JUSTIFY_RIGHT;
0566         break;
0567     case HDMI_LEFT_J:
0568         i2s_config_reg |= SII902X_TPI_I2S_SD_JUSTIFY_LEFT;
0569         break;
0570     default:
0571         dev_dbg(dev, "%s: Unsupported i2s format %u\n", __func__,
0572             daifmt->fmt);
0573         return -EINVAL;
0574     }
0575 
0576     if (daifmt->bit_clk_inv)
0577         i2s_config_reg |= SII902X_TPI_I2S_SCK_EDGE_FALLING;
0578     else
0579         i2s_config_reg |= SII902X_TPI_I2S_SCK_EDGE_RISING;
0580 
0581     if (daifmt->frame_clk_inv)
0582         i2s_config_reg |= SII902X_TPI_I2S_WS_POLARITY_LOW;
0583     else
0584         i2s_config_reg |= SII902X_TPI_I2S_WS_POLARITY_HIGH;
0585 
0586     if (params->channels > 2)
0587         config_byte2_reg |= SII902X_TPI_AUDIO_LAYOUT_8_CHANNELS;
0588     else
0589         config_byte2_reg |= SII902X_TPI_AUDIO_LAYOUT_2_CHANNELS;
0590 
0591     switch (params->sample_width) {
0592     case 16:
0593         config_byte3_reg |= SII902X_TPI_AUDIO_SAMPLE_SIZE_16;
0594         break;
0595     case 20:
0596         config_byte3_reg |= SII902X_TPI_AUDIO_SAMPLE_SIZE_20;
0597         break;
0598     case 24:
0599     case 32:
0600         config_byte3_reg |= SII902X_TPI_AUDIO_SAMPLE_SIZE_24;
0601         break;
0602     default:
0603         dev_err(dev, "%s: Unsupported sample width %u\n", __func__,
0604             params->sample_width);
0605         return -EINVAL;
0606     }
0607 
0608     for (i = 0; i < ARRAY_SIZE(sii902x_sample_freq); i++) {
0609         if (params->sample_rate == sii902x_sample_freq[i].freq) {
0610             config_byte3_reg |= sii902x_sample_freq[i].val;
0611             break;
0612         }
0613     }
0614 
0615     ret = clk_prepare_enable(sii902x->audio.mclk);
0616     if (ret) {
0617         dev_err(dev, "Enabling mclk failed: %d\n", ret);
0618         return ret;
0619     }
0620 
0621     if (sii902x->audio.mclk) {
0622         mclk_rate = clk_get_rate(sii902x->audio.mclk);
0623         ret = sii902x_select_mclk_div(&i2s_config_reg,
0624                           params->sample_rate, mclk_rate);
0625         if (mclk_rate != ret * params->sample_rate)
0626             dev_dbg(dev, "Inaccurate reference clock (%ld/%d != %u)\n",
0627                 mclk_rate, ret, params->sample_rate);
0628     }
0629 
0630     mutex_lock(&sii902x->mutex);
0631 
0632     ret = regmap_write(sii902x->regmap,
0633                SII902X_TPI_AUDIO_CONFIG_BYTE2_REG,
0634                config_byte2_reg);
0635     if (ret < 0)
0636         goto out;
0637 
0638     ret = regmap_write(sii902x->regmap, SII902X_TPI_I2S_INPUT_CONFIG_REG,
0639                i2s_config_reg);
0640     if (ret)
0641         goto out;
0642 
0643     for (i = 0; i < ARRAY_SIZE(sii902x->audio.i2s_fifo_sequence) &&
0644             sii902x->audio.i2s_fifo_sequence[i]; i++)
0645         regmap_write(sii902x->regmap,
0646                  SII902X_TPI_I2S_ENABLE_MAPPING_REG,
0647                  sii902x->audio.i2s_fifo_sequence[i]);
0648 
0649     ret = regmap_write(sii902x->regmap, SII902X_TPI_AUDIO_CONFIG_BYTE3_REG,
0650                config_byte3_reg);
0651     if (ret)
0652         goto out;
0653 
0654     ret = regmap_bulk_write(sii902x->regmap, SII902X_TPI_I2S_STRM_HDR_BASE,
0655                 params->iec.status,
0656                 min((size_t) SII902X_TPI_I2S_STRM_HDR_SIZE,
0657                     sizeof(params->iec.status)));
0658     if (ret)
0659         goto out;
0660 
0661     ret = hdmi_audio_infoframe_pack(&params->cea, infoframe_buf,
0662                     sizeof(infoframe_buf));
0663     if (ret < 0) {
0664         dev_err(dev, "%s: Failed to pack audio infoframe: %d\n",
0665             __func__, ret);
0666         goto out;
0667     }
0668 
0669     ret = regmap_bulk_write(sii902x->regmap,
0670                 SII902X_TPI_MISC_INFOFRAME_BASE,
0671                 infoframe_buf,
0672                 min(ret, SII902X_TPI_MISC_INFOFRAME_SIZE));
0673     if (ret)
0674         goto out;
0675 
0676     /* Decode Level 0 Packets */
0677     ret = regmap_write(sii902x->regmap, SII902X_IND_SET_PAGE, 0x02);
0678     if (ret)
0679         goto out;
0680 
0681     ret = regmap_write(sii902x->regmap, SII902X_IND_OFFSET, 0x24);
0682     if (ret)
0683         goto out;
0684 
0685     ret = regmap_write(sii902x->regmap, SII902X_IND_VALUE, 0x02);
0686     if (ret)
0687         goto out;
0688 
0689     dev_dbg(dev, "%s: hdmi audio enabled\n", __func__);
0690 out:
0691     mutex_unlock(&sii902x->mutex);
0692 
0693     if (ret) {
0694         clk_disable_unprepare(sii902x->audio.mclk);
0695         dev_err(dev, "%s: hdmi audio enable failed: %d\n", __func__,
0696             ret);
0697     }
0698 
0699     return ret;
0700 }
0701 
0702 static void sii902x_audio_shutdown(struct device *dev, void *data)
0703 {
0704     struct sii902x *sii902x = dev_get_drvdata(dev);
0705 
0706     mutex_lock(&sii902x->mutex);
0707 
0708     regmap_write(sii902x->regmap, SII902X_TPI_AUDIO_CONFIG_BYTE2_REG,
0709              SII902X_TPI_AUDIO_INTERFACE_DISABLE);
0710 
0711     mutex_unlock(&sii902x->mutex);
0712 
0713     clk_disable_unprepare(sii902x->audio.mclk);
0714 }
0715 
0716 static int sii902x_audio_mute(struct device *dev, void *data,
0717                   bool enable, int direction)
0718 {
0719     struct sii902x *sii902x = dev_get_drvdata(dev);
0720 
0721     mutex_lock(&sii902x->mutex);
0722 
0723     sii902x_mute(sii902x, enable);
0724 
0725     mutex_unlock(&sii902x->mutex);
0726 
0727     return 0;
0728 }
0729 
0730 static int sii902x_audio_get_eld(struct device *dev, void *data,
0731                  uint8_t *buf, size_t len)
0732 {
0733     struct sii902x *sii902x = dev_get_drvdata(dev);
0734 
0735     mutex_lock(&sii902x->mutex);
0736 
0737     memcpy(buf, sii902x->connector.eld,
0738            min(sizeof(sii902x->connector.eld), len));
0739 
0740     mutex_unlock(&sii902x->mutex);
0741 
0742     return 0;
0743 }
0744 
0745 static int sii902x_audio_get_dai_id(struct snd_soc_component *component,
0746                     struct device_node *endpoint)
0747 {
0748     struct of_endpoint of_ep;
0749     int ret;
0750 
0751     ret = of_graph_parse_endpoint(endpoint, &of_ep);
0752     if (ret < 0)
0753         return ret;
0754 
0755     /*
0756      * HDMI sound should be located at reg = <3>
0757      * Return expected DAI index 0.
0758      */
0759     if (of_ep.port == SII902X_AUDIO_PORT_INDEX)
0760         return 0;
0761 
0762     return -EINVAL;
0763 }
0764 
0765 static const struct hdmi_codec_ops sii902x_audio_codec_ops = {
0766     .hw_params = sii902x_audio_hw_params,
0767     .audio_shutdown = sii902x_audio_shutdown,
0768     .mute_stream = sii902x_audio_mute,
0769     .get_eld = sii902x_audio_get_eld,
0770     .get_dai_id = sii902x_audio_get_dai_id,
0771     .no_capture_mute = 1,
0772 };
0773 
0774 static int sii902x_audio_codec_init(struct sii902x *sii902x,
0775                     struct device *dev)
0776 {
0777     static const u8 audio_fifo_id[] = {
0778         SII902X_TPI_I2S_CONFIG_FIFO0,
0779         SII902X_TPI_I2S_CONFIG_FIFO1,
0780         SII902X_TPI_I2S_CONFIG_FIFO2,
0781         SII902X_TPI_I2S_CONFIG_FIFO3,
0782     };
0783     static const u8 i2s_lane_id[] = {
0784         SII902X_TPI_I2S_SELECT_SD0,
0785         SII902X_TPI_I2S_SELECT_SD1,
0786         SII902X_TPI_I2S_SELECT_SD2,
0787         SII902X_TPI_I2S_SELECT_SD3,
0788     };
0789     struct hdmi_codec_pdata codec_data = {
0790         .ops = &sii902x_audio_codec_ops,
0791         .i2s = 1, /* Only i2s support for now. */
0792         .spdif = 0,
0793         .max_i2s_channels = 0,
0794     };
0795     u8 lanes[4];
0796     int num_lanes, i;
0797 
0798     if (!of_property_read_bool(dev->of_node, "#sound-dai-cells")) {
0799         dev_dbg(dev, "%s: No \"#sound-dai-cells\", no audio\n",
0800             __func__);
0801         return 0;
0802     }
0803 
0804     num_lanes = of_property_read_variable_u8_array(dev->of_node,
0805                                "sil,i2s-data-lanes",
0806                                lanes, 1,
0807                                ARRAY_SIZE(lanes));
0808 
0809     if (num_lanes == -EINVAL) {
0810         dev_dbg(dev,
0811             "%s: No \"sil,i2s-data-lanes\", use default <0>\n",
0812             __func__);
0813         num_lanes = 1;
0814         lanes[0] = 0;
0815     } else if (num_lanes < 0) {
0816         dev_err(dev,
0817             "%s: Error gettin \"sil,i2s-data-lanes\": %d\n",
0818             __func__, num_lanes);
0819         return num_lanes;
0820     }
0821     codec_data.max_i2s_channels = 2 * num_lanes;
0822 
0823     for (i = 0; i < num_lanes; i++)
0824         sii902x->audio.i2s_fifo_sequence[i] |= audio_fifo_id[i] |
0825             i2s_lane_id[lanes[i]] | SII902X_TPI_I2S_FIFO_ENABLE;
0826 
0827     sii902x->audio.mclk = devm_clk_get_optional(dev, "mclk");
0828     if (IS_ERR(sii902x->audio.mclk)) {
0829         dev_err(dev, "%s: No clock (audio mclk) found: %ld\n",
0830             __func__, PTR_ERR(sii902x->audio.mclk));
0831         return PTR_ERR(sii902x->audio.mclk);
0832     }
0833 
0834     sii902x->audio.pdev = platform_device_register_data(
0835         dev, HDMI_CODEC_DRV_NAME, PLATFORM_DEVID_AUTO,
0836         &codec_data, sizeof(codec_data));
0837 
0838     return PTR_ERR_OR_ZERO(sii902x->audio.pdev);
0839 }
0840 
0841 static const struct regmap_range sii902x_volatile_ranges[] = {
0842     { .range_min = 0, .range_max = 0xff },
0843 };
0844 
0845 static const struct regmap_access_table sii902x_volatile_table = {
0846     .yes_ranges = sii902x_volatile_ranges,
0847     .n_yes_ranges = ARRAY_SIZE(sii902x_volatile_ranges),
0848 };
0849 
0850 static const struct regmap_config sii902x_regmap_config = {
0851     .reg_bits = 8,
0852     .val_bits = 8,
0853     .disable_locking = true, /* struct sii902x mutex should be enough */
0854     .max_register = SII902X_TPI_MISC_INFOFRAME_END,
0855     .volatile_table = &sii902x_volatile_table,
0856     .cache_type = REGCACHE_NONE,
0857 };
0858 
0859 static irqreturn_t sii902x_interrupt(int irq, void *data)
0860 {
0861     struct sii902x *sii902x = data;
0862     unsigned int status = 0;
0863 
0864     mutex_lock(&sii902x->mutex);
0865 
0866     regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);
0867     regmap_write(sii902x->regmap, SII902X_INT_STATUS, status);
0868 
0869     mutex_unlock(&sii902x->mutex);
0870 
0871     if ((status & SII902X_HOTPLUG_EVENT) && sii902x->bridge.dev) {
0872         drm_helper_hpd_irq_event(sii902x->bridge.dev);
0873         drm_bridge_hpd_notify(&sii902x->bridge, (status & SII902X_PLUGGED_STATUS)
0874                                 ? connector_status_connected
0875                                 : connector_status_disconnected);
0876     }
0877 
0878     return IRQ_HANDLED;
0879 }
0880 
0881 /*
0882  * The purpose of sii902x_i2c_bypass_select is to enable the pass through
0883  * mode of the HDMI transmitter. Do not use regmap from within this function,
0884  * only use sii902x_*_unlocked functions to read/modify/write registers.
0885  * We are holding the parent adapter lock here, keep this in mind before
0886  * adding more i2c transactions.
0887  *
0888  * Also, since SII902X_SYS_CTRL_DATA is used with regmap_update_bits elsewhere
0889  * in this driver, we need to make sure that we only touch 0x1A[2:1] from
0890  * within sii902x_i2c_bypass_select and sii902x_i2c_bypass_deselect, and that
0891  * we leave the remaining bits as we have found them.
0892  */
0893 static int sii902x_i2c_bypass_select(struct i2c_mux_core *mux, u32 chan_id)
0894 {
0895     struct sii902x *sii902x = i2c_mux_priv(mux);
0896     struct device *dev = &sii902x->i2c->dev;
0897     unsigned long timeout;
0898     u8 status;
0899     int ret;
0900 
0901     ret = sii902x_update_bits_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
0902                        SII902X_SYS_CTRL_DDC_BUS_REQ,
0903                        SII902X_SYS_CTRL_DDC_BUS_REQ);
0904     if (ret)
0905         return ret;
0906 
0907     timeout = jiffies +
0908           msecs_to_jiffies(SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS);
0909     do {
0910         ret = sii902x_read_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
0911                         &status);
0912         if (ret)
0913             return ret;
0914     } while (!(status & SII902X_SYS_CTRL_DDC_BUS_GRTD) &&
0915          time_before(jiffies, timeout));
0916 
0917     if (!(status & SII902X_SYS_CTRL_DDC_BUS_GRTD)) {
0918         dev_err(dev, "Failed to acquire the i2c bus\n");
0919         return -ETIMEDOUT;
0920     }
0921 
0922     return sii902x_write_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
0923                       status);
0924 }
0925 
0926 /*
0927  * The purpose of sii902x_i2c_bypass_deselect is to disable the pass through
0928  * mode of the HDMI transmitter. Do not use regmap from within this function,
0929  * only use sii902x_*_unlocked functions to read/modify/write registers.
0930  * We are holding the parent adapter lock here, keep this in mind before
0931  * adding more i2c transactions.
0932  *
0933  * Also, since SII902X_SYS_CTRL_DATA is used with regmap_update_bits elsewhere
0934  * in this driver, we need to make sure that we only touch 0x1A[2:1] from
0935  * within sii902x_i2c_bypass_select and sii902x_i2c_bypass_deselect, and that
0936  * we leave the remaining bits as we have found them.
0937  */
0938 static int sii902x_i2c_bypass_deselect(struct i2c_mux_core *mux, u32 chan_id)
0939 {
0940     struct sii902x *sii902x = i2c_mux_priv(mux);
0941     struct device *dev = &sii902x->i2c->dev;
0942     unsigned long timeout;
0943     unsigned int retries;
0944     u8 status;
0945     int ret;
0946 
0947     /*
0948      * When the HDMI transmitter is in pass through mode, we need an
0949      * (undocumented) additional delay between STOP and START conditions
0950      * to guarantee the bus won't get stuck.
0951      */
0952     udelay(30);
0953 
0954     /*
0955      * Sometimes the I2C bus can stall after failure to use the
0956      * EDID channel. Retry a few times to see if things clear
0957      * up, else continue anyway.
0958      */
0959     retries = 5;
0960     do {
0961         ret = sii902x_read_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
0962                         &status);
0963         retries--;
0964     } while (ret && retries);
0965     if (ret) {
0966         dev_err(dev, "failed to read status (%d)\n", ret);
0967         return ret;
0968     }
0969 
0970     ret = sii902x_update_bits_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
0971                        SII902X_SYS_CTRL_DDC_BUS_REQ |
0972                        SII902X_SYS_CTRL_DDC_BUS_GRTD, 0);
0973     if (ret)
0974         return ret;
0975 
0976     timeout = jiffies +
0977           msecs_to_jiffies(SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS);
0978     do {
0979         ret = sii902x_read_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
0980                         &status);
0981         if (ret)
0982             return ret;
0983     } while (status & (SII902X_SYS_CTRL_DDC_BUS_REQ |
0984                SII902X_SYS_CTRL_DDC_BUS_GRTD) &&
0985          time_before(jiffies, timeout));
0986 
0987     if (status & (SII902X_SYS_CTRL_DDC_BUS_REQ |
0988               SII902X_SYS_CTRL_DDC_BUS_GRTD)) {
0989         dev_err(dev, "failed to release the i2c bus\n");
0990         return -ETIMEDOUT;
0991     }
0992 
0993     return 0;
0994 }
0995 
0996 static const struct drm_bridge_timings default_sii902x_timings = {
0997     .input_bus_flags = DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE
0998          | DRM_BUS_FLAG_SYNC_SAMPLE_NEGEDGE
0999          | 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 <boris.brezillon@free-electrons.com>");
1185 MODULE_DESCRIPTION("SII902x RGB -> HDMI bridges");
1186 MODULE_LICENSE("GPL");
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