// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2012 Texas Instruments
 * Author: Rob Clark <robdclark@gmail.com>
 */

#include <linux/component.h>
#include <linux/gpio/consumer.h>
#include <linux/hdmi.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/platform_data/tda9950.h>
#include <linux/irq.h>
#include <sound/asoundef.h>
#include <sound/hdmi-codec.h>

#include <drm/drm_atomic_helper.h>
#include <drm/drm_bridge.h>
#include <drm/drm_edid.h>
#include <drm/drm_of.h>
#include <drm/drm_print.h>
#include <drm/drm_probe_helper.h>
#include <drm/drm_simple_kms_helper.h>

#include <media/cec-notifier.h>

#include <dt-bindings/display/tda998x.h>

#define DBG(fmt, ...) DRM_DEBUG(fmt"\n", ##__VA_ARGS__)

enum {
        AUDIO_ROUTE_I2S,
        AUDIO_ROUTE_SPDIF,
        AUDIO_ROUTE_NUM
};

struct tda998x_audio_route {
        u8 ena_aclk;
        u8 mux_ap;
        u8 aip_clksel;
};

struct tda998x_audio_settings {
        const struct tda998x_audio_route *route;
        struct hdmi_audio_infoframe cea;
        unsigned int sample_rate;
        u8 status[5];
        u8 ena_ap;
        u8 i2s_format;
        u8 cts_n;
};

struct tda998x_priv {
        struct i2c_client *cec;
        struct i2c_client *hdmi;
        struct mutex mutex;
        u16 rev;
        u8 cec_addr;
        u8 current_page;
        bool is_on;
        bool supports_infoframes;
        bool sink_has_audio;
        enum hdmi_quantization_range rgb_quant_range;
        u8 vip_cntrl_0;
        u8 vip_cntrl_1;
        u8 vip_cntrl_2;
        unsigned long tmds_clock;
        struct tda998x_audio_settings audio;

        struct platform_device *audio_pdev;
        struct mutex audio_mutex;

        struct mutex edid_mutex;
        wait_queue_head_t wq_edid;
        volatile int wq_edid_wait;

        struct work_struct detect_work;
        struct timer_list edid_delay_timer;
        wait_queue_head_t edid_delay_waitq;
        bool edid_delay_active;

        struct drm_encoder encoder;
        struct drm_bridge bridge;
        struct drm_connector connector;

        u8 audio_port_enable[AUDIO_ROUTE_NUM];
        struct tda9950_glue cec_glue;
        struct gpio_desc *calib;
        struct cec_notifier *cec_notify;
};

#define conn_to_tda998x_priv(x) \
        container_of(x, struct tda998x_priv, connector)
#define enc_to_tda998x_priv(x) \
        container_of(x, struct tda998x_priv, encoder)
#define bridge_to_tda998x_priv(x) \
        container_of(x, struct tda998x_priv, bridge)

/* The TDA9988 series of devices use a paged register scheme.. to simplify
 * things we encode the page # in upper bits of the register #.  To read/
 * write a given register, we need to make sure CURPAGE register is set
 * appropriately.  Which implies reads/writes are not atomic.  Fun!
 */

#define REG(page, addr) (((page) << 8) | (addr))
#define REG2ADDR(reg)   ((reg) & 0xff)
#define REG2PAGE(reg)   (((reg) >> 8) & 0xff)

#define REG_CURPAGE               0xff                /* write */


/* Page 00h: General Control */
#define REG_VERSION_LSB           REG(0x00, 0x00)     /* read */
#define REG_MAIN_CNTRL0           REG(0x00, 0x01)     /* read/write */
# define MAIN_CNTRL0_SR           (1 << 0)
# define MAIN_CNTRL0_DECS         (1 << 1)
# define MAIN_CNTRL0_DEHS         (1 << 2)
# define MAIN_CNTRL0_CECS         (1 << 3)
# define MAIN_CNTRL0_CEHS         (1 << 4)
# define MAIN_CNTRL0_SCALER       (1 << 7)
#define REG_VERSION_MSB           REG(0x00, 0x02)     /* read */
#define REG_SOFTRESET             REG(0x00, 0x0a)     /* write */
# define SOFTRESET_AUDIO          (1 << 0)
# define SOFTRESET_I2C_MASTER     (1 << 1)
#define REG_DDC_DISABLE           REG(0x00, 0x0b)     /* read/write */
#define REG_CCLK_ON               REG(0x00, 0x0c)     /* read/write */
#define REG_I2C_MASTER            REG(0x00, 0x0d)     /* read/write */
# define I2C_MASTER_DIS_MM        (1 << 0)
# define I2C_MASTER_DIS_FILT      (1 << 1)
# define I2C_MASTER_APP_STRT_LAT  (1 << 2)
#define REG_FEAT_POWERDOWN        REG(0x00, 0x0e)     /* read/write */
# define FEAT_POWERDOWN_PREFILT   BIT(0)
# define FEAT_POWERDOWN_CSC       BIT(1)
# define FEAT_POWERDOWN_SPDIF     (1 << 3)
#define REG_INT_FLAGS_0           REG(0x00, 0x0f)     /* read/write */
#define REG_INT_FLAGS_1           REG(0x00, 0x10)     /* read/write */
#define REG_INT_FLAGS_2           REG(0x00, 0x11)     /* read/write */
# define INT_FLAGS_2_EDID_BLK_RD  (1 << 1)
#define REG_ENA_ACLK              REG(0x00, 0x16)     /* read/write */
#define REG_ENA_VP_0              REG(0x00, 0x18)     /* read/write */
#define REG_ENA_VP_1              REG(0x00, 0x19)     /* read/write */
#define REG_ENA_VP_2              REG(0x00, 0x1a)     /* read/write */
#define REG_ENA_AP                REG(0x00, 0x1e)     /* read/write */
#define REG_VIP_CNTRL_0           REG(0x00, 0x20)     /* write */
# define VIP_CNTRL_0_MIRR_A       (1 << 7)
# define VIP_CNTRL_0_SWAP_A(x)    (((x) & 7) << 4)
# define VIP_CNTRL_0_MIRR_B       (1 << 3)
# define VIP_CNTRL_0_SWAP_B(x)    (((x) & 7) << 0)
#define REG_VIP_CNTRL_1           REG(0x00, 0x21)     /* write */
# define VIP_CNTRL_1_MIRR_C       (1 << 7)
# define VIP_CNTRL_1_SWAP_C(x)    (((x) & 7) << 4)
# define VIP_CNTRL_1_MIRR_D       (1 << 3)
# define VIP_CNTRL_1_SWAP_D(x)    (((x) & 7) << 0)
#define REG_VIP_CNTRL_2           REG(0x00, 0x22)     /* write */
# define VIP_CNTRL_2_MIRR_E       (1 << 7)
# define VIP_CNTRL_2_SWAP_E(x)    (((x) & 7) << 4)
# define VIP_CNTRL_2_MIRR_F       (1 << 3)
# define VIP_CNTRL_2_SWAP_F(x)    (((x) & 7) << 0)
#define REG_VIP_CNTRL_3           REG(0x00, 0x23)     /* write */
# define VIP_CNTRL_3_X_TGL        (1 << 0)
# define VIP_CNTRL_3_H_TGL        (1 << 1)
# define VIP_CNTRL_3_V_TGL        (1 << 2)
# define VIP_CNTRL_3_EMB          (1 << 3)
# define VIP_CNTRL_3_SYNC_DE      (1 << 4)
# define VIP_CNTRL_3_SYNC_HS      (1 << 5)
# define VIP_CNTRL_3_DE_INT       (1 << 6)
# define VIP_CNTRL_3_EDGE         (1 << 7)
#define REG_VIP_CNTRL_4           REG(0x00, 0x24)     /* write */
# define VIP_CNTRL_4_BLC(x)       (((x) & 3) << 0)
# define VIP_CNTRL_4_BLANKIT(x)   (((x) & 3) << 2)
# define VIP_CNTRL_4_CCIR656      (1 << 4)
# define VIP_CNTRL_4_656_ALT      (1 << 5)
# define VIP_CNTRL_4_TST_656      (1 << 6)
# define VIP_CNTRL_4_TST_PAT      (1 << 7)
#define REG_VIP_CNTRL_5           REG(0x00, 0x25)     /* write */
# define VIP_CNTRL_5_CKCASE       (1 << 0)
# define VIP_CNTRL_5_SP_CNT(x)    (((x) & 3) << 1)
#define REG_MUX_AP                REG(0x00, 0x26)     /* read/write */
# define MUX_AP_SELECT_I2S        0x64
# define MUX_AP_SELECT_SPDIF      0x40
#define REG_MUX_VP_VIP_OUT        REG(0x00, 0x27)     /* read/write */
#define REG_MAT_CONTRL            REG(0x00, 0x80)     /* write */
# define MAT_CONTRL_MAT_SC(x)     (((x) & 3) << 0)
# define MAT_CONTRL_MAT_BP        (1 << 2)
#define REG_VIDFORMAT             REG(0x00, 0xa0)     /* write */
#define REG_REFPIX_MSB            REG(0x00, 0xa1)     /* write */
#define REG_REFPIX_LSB            REG(0x00, 0xa2)     /* write */
#define REG_REFLINE_MSB           REG(0x00, 0xa3)     /* write */
#define REG_REFLINE_LSB           REG(0x00, 0xa4)     /* write */
#define REG_NPIX_MSB              REG(0x00, 0xa5)     /* write */
#define REG_NPIX_LSB              REG(0x00, 0xa6)     /* write */
#define REG_NLINE_MSB             REG(0x00, 0xa7)     /* write */
#define REG_NLINE_LSB             REG(0x00, 0xa8)     /* write */
#define REG_VS_LINE_STRT_1_MSB    REG(0x00, 0xa9)     /* write */
#define REG_VS_LINE_STRT_1_LSB    REG(0x00, 0xaa)     /* write */
#define REG_VS_PIX_STRT_1_MSB     REG(0x00, 0xab)     /* write */
#define REG_VS_PIX_STRT_1_LSB     REG(0x00, 0xac)     /* write */
#define REG_VS_LINE_END_1_MSB     REG(0x00, 0xad)     /* write */
#define REG_VS_LINE_END_1_LSB     REG(0x00, 0xae)     /* write */
#define REG_VS_PIX_END_1_MSB      REG(0x00, 0xaf)     /* write */
#define REG_VS_PIX_END_1_LSB      REG(0x00, 0xb0)     /* write */
#define REG_VS_LINE_STRT_2_MSB    REG(0x00, 0xb1)     /* write */
#define REG_VS_LINE_STRT_2_LSB    REG(0x00, 0xb2)     /* write */
#define REG_VS_PIX_STRT_2_MSB     REG(0x00, 0xb3)     /* write */
#define REG_VS_PIX_STRT_2_LSB     REG(0x00, 0xb4)     /* write */
#define REG_VS_LINE_END_2_MSB     REG(0x00, 0xb5)     /* write */
#define REG_VS_LINE_END_2_LSB     REG(0x00, 0xb6)     /* write */
#define REG_VS_PIX_END_2_MSB      REG(0x00, 0xb7)     /* write */
#define REG_VS_PIX_END_2_LSB      REG(0x00, 0xb8)     /* write */
#define REG_HS_PIX_START_MSB      REG(0x00, 0xb9)     /* write */
#define REG_HS_PIX_START_LSB      REG(0x00, 0xba)     /* write */
#define REG_HS_PIX_STOP_MSB       REG(0x00, 0xbb)     /* write */
#define REG_HS_PIX_STOP_LSB       REG(0x00, 0xbc)     /* write */
#define REG_VWIN_START_1_MSB      REG(0x00, 0xbd)     /* write */
#define REG_VWIN_START_1_LSB      REG(0x00, 0xbe)     /* write */
#define REG_VWIN_END_1_MSB        REG(0x00, 0xbf)     /* write */
#define REG_VWIN_END_1_LSB        REG(0x00, 0xc0)     /* write */
#define REG_VWIN_START_2_MSB      REG(0x00, 0xc1)     /* write */
#define REG_VWIN_START_2_LSB      REG(0x00, 0xc2)     /* write */
#define REG_VWIN_END_2_MSB        REG(0x00, 0xc3)     /* write */
#define REG_VWIN_END_2_LSB        REG(0x00, 0xc4)     /* write */
#define REG_DE_START_MSB          REG(0x00, 0xc5)     /* write */
#define REG_DE_START_LSB          REG(0x00, 0xc6)     /* write */
#define REG_DE_STOP_MSB           REG(0x00, 0xc7)     /* write */
#define REG_DE_STOP_LSB           REG(0x00, 0xc8)     /* write */
#define REG_TBG_CNTRL_0           REG(0x00, 0xca)     /* write */
# define TBG_CNTRL_0_TOP_TGL      (1 << 0)
# define TBG_CNTRL_0_TOP_SEL      (1 << 1)
# define TBG_CNTRL_0_DE_EXT       (1 << 2)
# define TBG_CNTRL_0_TOP_EXT      (1 << 3)
# define TBG_CNTRL_0_FRAME_DIS    (1 << 5)
# define TBG_CNTRL_0_SYNC_MTHD    (1 << 6)
# define TBG_CNTRL_0_SYNC_ONCE    (1 << 7)
#define REG_TBG_CNTRL_1           REG(0x00, 0xcb)     /* write */
# define TBG_CNTRL_1_H_TGL        (1 << 0)
# define TBG_CNTRL_1_V_TGL        (1 << 1)
# define TBG_CNTRL_1_TGL_EN       (1 << 2)
# define TBG_CNTRL_1_X_EXT        (1 << 3)
# define TBG_CNTRL_1_H_EXT        (1 << 4)
# define TBG_CNTRL_1_V_EXT        (1 << 5)
# define TBG_CNTRL_1_DWIN_DIS     (1 << 6)
#define REG_ENABLE_SPACE          REG(0x00, 0xd6)     /* write */
#define REG_HVF_CNTRL_0           REG(0x00, 0xe4)     /* write */
# define HVF_CNTRL_0_SM           (1 << 7)
# define HVF_CNTRL_0_RWB          (1 << 6)
# define HVF_CNTRL_0_PREFIL(x)    (((x) & 3) << 2)
# define HVF_CNTRL_0_INTPOL(x)    (((x) & 3) << 0)
#define REG_HVF_CNTRL_1           REG(0x00, 0xe5)     /* write */
# define HVF_CNTRL_1_FOR          (1 << 0)
# define HVF_CNTRL_1_YUVBLK       (1 << 1)
# define HVF_CNTRL_1_VQR(x)       (((x) & 3) << 2)
# define HVF_CNTRL_1_PAD(x)       (((x) & 3) << 4)
# define HVF_CNTRL_1_SEMI_PLANAR  (1 << 6)
#define REG_RPT_CNTRL             REG(0x00, 0xf0)     /* write */
# define RPT_CNTRL_REPEAT(x)      ((x) & 15)
#define REG_I2S_FORMAT            REG(0x00, 0xfc)     /* read/write */
# define I2S_FORMAT_PHILIPS       (0 << 0)
# define I2S_FORMAT_LEFT_J        (2 << 0)
# define I2S_FORMAT_RIGHT_J       (3 << 0)
#define REG_AIP_CLKSEL            REG(0x00, 0xfd)     /* write */
# define AIP_CLKSEL_AIP_SPDIF     (0 << 3)
# define AIP_CLKSEL_AIP_I2S       (1 << 3)
# define AIP_CLKSEL_FS_ACLK       (0 << 0)
# define AIP_CLKSEL_FS_MCLK       (1 << 0)
# define AIP_CLKSEL_FS_FS64SPDIF  (2 << 0)

/* Page 02h: PLL settings */
#define REG_PLL_SERIAL_1          REG(0x02, 0x00)     /* read/write */
# define PLL_SERIAL_1_SRL_FDN     (1 << 0)
# define PLL_SERIAL_1_SRL_IZ(x)   (((x) & 3) << 1)
# define PLL_SERIAL_1_SRL_MAN_IZ  (1 << 6)
#define REG_PLL_SERIAL_2          REG(0x02, 0x01)     /* read/write */
# define PLL_SERIAL_2_SRL_NOSC(x) ((x) << 0)
# define PLL_SERIAL_2_SRL_PR(x)   (((x) & 0xf) << 4)
#define REG_PLL_SERIAL_3          REG(0x02, 0x02)     /* read/write */
# define PLL_SERIAL_3_SRL_CCIR    (1 << 0)
# define PLL_SERIAL_3_SRL_DE      (1 << 2)
# define PLL_SERIAL_3_SRL_PXIN_SEL (1 << 4)
#define REG_SERIALIZER            REG(0x02, 0x03)     /* read/write */
#define REG_BUFFER_OUT            REG(0x02, 0x04)     /* read/write */
#define REG_PLL_SCG1              REG(0x02, 0x05)     /* read/write */
#define REG_PLL_SCG2              REG(0x02, 0x06)     /* read/write */
#define REG_PLL_SCGN1             REG(0x02, 0x07)     /* read/write */
#define REG_PLL_SCGN2             REG(0x02, 0x08)     /* read/write */
#define REG_PLL_SCGR1             REG(0x02, 0x09)     /* read/write */
#define REG_PLL_SCGR2             REG(0x02, 0x0a)     /* read/write */
#define REG_AUDIO_DIV             REG(0x02, 0x0e)     /* read/write */
# define AUDIO_DIV_SERCLK_1       0
# define AUDIO_DIV_SERCLK_2       1
# define AUDIO_DIV_SERCLK_4       2
# define AUDIO_DIV_SERCLK_8       3
# define AUDIO_DIV_SERCLK_16      4
# define AUDIO_DIV_SERCLK_32      5
#define REG_SEL_CLK               REG(0x02, 0x11)     /* read/write */
# define SEL_CLK_SEL_CLK1         (1 << 0)
# define SEL_CLK_SEL_VRF_CLK(x)   (((x) & 3) << 1)
# define SEL_CLK_ENA_SC_CLK       (1 << 3)
#define REG_ANA_GENERAL           REG(0x02, 0x12)     /* read/write */


/* Page 09h: EDID Control */
#define REG_EDID_DATA_0           REG(0x09, 0x00)     /* read */
/* next 127 successive registers are the EDID block */
#define REG_EDID_CTRL             REG(0x09, 0xfa)     /* read/write */
#define REG_DDC_ADDR              REG(0x09, 0xfb)     /* read/write */
#define REG_DDC_OFFS              REG(0x09, 0xfc)     /* read/write */
#define REG_DDC_SEGM_ADDR         REG(0x09, 0xfd)     /* read/write */
#define REG_DDC_SEGM              REG(0x09, 0xfe)     /* read/write */


/* Page 10h: information frames and packets */
#define REG_IF1_HB0               REG(0x10, 0x20)     /* read/write */
#define REG_IF2_HB0               REG(0x10, 0x40)     /* read/write */
#define REG_IF3_HB0               REG(0x10, 0x60)     /* read/write */
#define REG_IF4_HB0               REG(0x10, 0x80)     /* read/write */
#define REG_IF5_HB0               REG(0x10, 0xa0)     /* read/write */


/* Page 11h: audio settings and content info packets */
#define REG_AIP_CNTRL_0           REG(0x11, 0x00)     /* read/write */
# define AIP_CNTRL_0_RST_FIFO     (1 << 0)
# define AIP_CNTRL_0_SWAP         (1 << 1)
# define AIP_CNTRL_0_LAYOUT       (1 << 2)
# define AIP_CNTRL_0_ACR_MAN      (1 << 5)
# define AIP_CNTRL_0_RST_CTS      (1 << 6)
#define REG_CA_I2S                REG(0x11, 0x01)     /* read/write */
# define CA_I2S_CA_I2S(x)         (((x) & 31) << 0)
# define CA_I2S_HBR_CHSTAT        (1 << 6)
#define REG_LATENCY_RD            REG(0x11, 0x04)     /* read/write */
#define REG_ACR_CTS_0             REG(0x11, 0x05)     /* read/write */
#define REG_ACR_CTS_1             REG(0x11, 0x06)     /* read/write */
#define REG_ACR_CTS_2             REG(0x11, 0x07)     /* read/write */
#define REG_ACR_N_0               REG(0x11, 0x08)     /* read/write */
#define REG_ACR_N_1               REG(0x11, 0x09)     /* read/write */
#define REG_ACR_N_2               REG(0x11, 0x0a)     /* read/write */
#define REG_CTS_N                 REG(0x11, 0x0c)     /* read/write */
# define CTS_N_K(x)               (((x) & 7) << 0)
# define CTS_N_M(x)               (((x) & 3) << 4)
#define REG_ENC_CNTRL             REG(0x11, 0x0d)     /* read/write */
# define ENC_CNTRL_RST_ENC        (1 << 0)
# define ENC_CNTRL_RST_SEL        (1 << 1)
# define ENC_CNTRL_CTL_CODE(x)    (((x) & 3) << 2)
#define REG_DIP_FLAGS             REG(0x11, 0x0e)     /* read/write */
# define DIP_FLAGS_ACR            (1 << 0)
# define DIP_FLAGS_GC             (1 << 1)
#define REG_DIP_IF_FLAGS          REG(0x11, 0x0f)     /* read/write */
# define DIP_IF_FLAGS_IF1         (1 << 1)
# define DIP_IF_FLAGS_IF2         (1 << 2)
# define DIP_IF_FLAGS_IF3         (1 << 3)
# define DIP_IF_FLAGS_IF4         (1 << 4)
# define DIP_IF_FLAGS_IF5         (1 << 5)
#define REG_CH_STAT_B(x)          REG(0x11, 0x14 + (x)) /* read/write */


/* Page 12h: HDCP and OTP */
#define REG_TX3                   REG(0x12, 0x9a)     /* read/write */
#define REG_TX4                   REG(0x12, 0x9b)     /* read/write */
# define TX4_PD_RAM               (1 << 1)
#define REG_TX33                  REG(0x12, 0xb8)     /* read/write */
# define TX33_HDMI                (1 << 1)


/* Page 13h: Gamut related metadata packets */



/* CEC registers: (not paged)
 */
#define REG_CEC_INTSTATUS         0xee                /* read */
# define CEC_INTSTATUS_CEC        (1 << 0)
# define CEC_INTSTATUS_HDMI       (1 << 1)
#define REG_CEC_CAL_XOSC_CTRL1    0xf2
# define CEC_CAL_XOSC_CTRL1_ENA_CAL     BIT(0)
#define REG_CEC_DES_FREQ2         0xf5
# define CEC_DES_FREQ2_DIS_AUTOCAL BIT(7)
#define REG_CEC_CLK               0xf6
# define CEC_CLK_FRO              0x11
#define REG_CEC_FRO_IM_CLK_CTRL   0xfb                /* read/write */
# define CEC_FRO_IM_CLK_CTRL_GHOST_DIS (1 << 7)
# define CEC_FRO_IM_CLK_CTRL_ENA_OTP   (1 << 6)
# define CEC_FRO_IM_CLK_CTRL_IMCLK_SEL (1 << 1)
# define CEC_FRO_IM_CLK_CTRL_FRO_DIV   (1 << 0)
#define REG_CEC_RXSHPDINTENA      0xfc                /* read/write */
#define REG_CEC_RXSHPDINT         0xfd                /* read */
# define CEC_RXSHPDINT_RXSENS     BIT(0)
# define CEC_RXSHPDINT_HPD        BIT(1)
#define REG_CEC_RXSHPDLEV         0xfe                /* read */
# define CEC_RXSHPDLEV_RXSENS     (1 << 0)
# define CEC_RXSHPDLEV_HPD        (1 << 1)

#define REG_CEC_ENAMODS           0xff                /* read/write */
# define CEC_ENAMODS_EN_CEC_CLK   (1 << 7)
# define CEC_ENAMODS_DIS_FRO      (1 << 6)
# define CEC_ENAMODS_DIS_CCLK     (1 << 5)
# define CEC_ENAMODS_EN_RXSENS    (1 << 2)
# define CEC_ENAMODS_EN_HDMI      (1 << 1)
# define CEC_ENAMODS_EN_CEC       (1 << 0)


/* Device versions: */
#define TDA9989N2                 0x0101
#define TDA19989                  0x0201
#define TDA19989N2                0x0202
#define TDA19988                  0x0301

static void
cec_write(struct tda998x_priv *priv, u16 addr, u8 val)
{
        u8 buf[] = {addr, val};
        struct i2c_msg msg = {
                .addr = priv->cec_addr,
                .len = 2,
                .buf = buf,
        };
        int ret;

        ret = i2c_transfer(priv->hdmi->adapter, &msg, 1);
        if (ret < 0)
                dev_err(&priv->hdmi->dev, "Error %d writing to cec:0x%x\n",
                        ret, addr);
}

static u8
cec_read(struct tda998x_priv *priv, u8 addr)
{
        u8 val;
        struct i2c_msg msg[2] = {
                {
                        .addr = priv->cec_addr,
                        .len = 1,
                        .buf = &addr,
                }, {
                        .addr = priv->cec_addr,
                        .flags = I2C_M_RD,
                        .len = 1,
                        .buf = &val,
                },
        };
        int ret;

        ret = i2c_transfer(priv->hdmi->adapter, msg, ARRAY_SIZE(msg));
        if (ret < 0) {
                dev_err(&priv->hdmi->dev, "Error %d reading from cec:0x%x\n",
                        ret, addr);
                val = 0;
        }

        return val;
}

static void cec_enamods(struct tda998x_priv *priv, u8 mods, bool enable)
{
        int val = cec_read(priv, REG_CEC_ENAMODS);

        if (val < 0)
                return;

        if (enable)
                val |= mods;
        else
                val &= ~mods;

        cec_write(priv, REG_CEC_ENAMODS, val);
}

static void tda998x_cec_set_calibration(struct tda998x_priv *priv, bool enable)
{
        if (enable) {
                u8 val;

                cec_write(priv, 0xf3, 0xc0);
                cec_write(priv, 0xf4, 0xd4);

                /* Enable automatic calibration mode */
                val = cec_read(priv, REG_CEC_DES_FREQ2);
                val &= ~CEC_DES_FREQ2_DIS_AUTOCAL;
                cec_write(priv, REG_CEC_DES_FREQ2, val);

                /* Enable free running oscillator */
                cec_write(priv, REG_CEC_CLK, CEC_CLK_FRO);
                cec_enamods(priv, CEC_ENAMODS_DIS_FRO, false);

                cec_write(priv, REG_CEC_CAL_XOSC_CTRL1,
                          CEC_CAL_XOSC_CTRL1_ENA_CAL);
        } else {
                cec_write(priv, REG_CEC_CAL_XOSC_CTRL1, 0);
        }
}

/*
 * Calibration for the internal oscillator: we need to set calibration mode,
 * and then pulse the IRQ line low for a 10ms ± 1% period.
 */
static void tda998x_cec_calibration(struct tda998x_priv *priv)
{
        struct gpio_desc *calib = priv->calib;

        mutex_lock(&priv->edid_mutex);
        if (priv->hdmi->irq > 0)
                disable_irq(priv->hdmi->irq);
        gpiod_direction_output(calib, 1);
        tda998x_cec_set_calibration(priv, true);

        local_irq_disable();
        gpiod_set_value(calib, 0);
        mdelay(10);
        gpiod_set_value(calib, 1);
        local_irq_enable();

        tda998x_cec_set_calibration(priv, false);
        gpiod_direction_input(calib);
        if (priv->hdmi->irq > 0)
                enable_irq(priv->hdmi->irq);
        mutex_unlock(&priv->edid_mutex);
}

static int tda998x_cec_hook_init(void *data)
{
        struct tda998x_priv *priv = data;
        struct gpio_desc *calib;

        calib = gpiod_get(&priv->hdmi->dev, "nxp,calib", GPIOD_ASIS);
        if (IS_ERR(calib)) {
                dev_warn(&priv->hdmi->dev, "failed to get calibration gpio: %ld\n",
                         PTR_ERR(calib));
                return PTR_ERR(calib);
        }

        priv->calib = calib;

        return 0;
}

static void tda998x_cec_hook_exit(void *data)
{
        struct tda998x_priv *priv = data;

        gpiod_put(priv->calib);
        priv->calib = NULL;
}

static int tda998x_cec_hook_open(void *data)
{
        struct tda998x_priv *priv = data;

        cec_enamods(priv, CEC_ENAMODS_EN_CEC_CLK | CEC_ENAMODS_EN_CEC, true);
        tda998x_cec_calibration(priv);

        return 0;
}

static void tda998x_cec_hook_release(void *data)
{
        struct tda998x_priv *priv = data;

        cec_enamods(priv, CEC_ENAMODS_EN_CEC_CLK | CEC_ENAMODS_EN_CEC, false);
}

static int
set_page(struct tda998x_priv *priv, u16 reg)
{
        if (REG2PAGE(reg) != priv->current_page) {
                struct i2c_client *client = priv->hdmi;
                u8 buf[] = {
                                REG_CURPAGE, REG2PAGE(reg)
                };
                int ret = i2c_master_send(client, buf, sizeof(buf));
                if (ret < 0) {
                        dev_err(&client->dev, "%s %04x err %d\n", __func__,
                                        reg, ret);
                        return ret;
                }

                priv->current_page = REG2PAGE(reg);
        }
        return 0;
}

static int
reg_read_range(struct tda998x_priv *priv, u16 reg, char *buf, int cnt)
{
        struct i2c_client *client = priv->hdmi;
        u8 addr = REG2ADDR(reg);
        int ret;

        mutex_lock(&priv->mutex);
        ret = set_page(priv, reg);
        if (ret < 0)
                goto out;

        ret = i2c_master_send(client, &addr, sizeof(addr));
        if (ret < 0)
                goto fail;

        ret = i2c_master_recv(client, buf, cnt);
        if (ret < 0)
                goto fail;

        goto out;

fail:
        dev_err(&client->dev, "Error %d reading from 0x%x\n", ret, reg);
out:
        mutex_unlock(&priv->mutex);
        return ret;
}

#define MAX_WRITE_RANGE_BUF 32

static void
reg_write_range(struct tda998x_priv *priv, u16 reg, u8 *p, int cnt)
{
        struct i2c_client *client = priv->hdmi;
        /* This is the maximum size of the buffer passed in */
        u8 buf[MAX_WRITE_RANGE_BUF + 1];
        int ret;

        if (cnt > MAX_WRITE_RANGE_BUF) {
                dev_err(&client->dev, "Fixed write buffer too small (%d)\n",
                                MAX_WRITE_RANGE_BUF);
                return;
        }

        buf[0] = REG2ADDR(reg);
        memcpy(&buf[1], p, cnt);

        mutex_lock(&priv->mutex);
        ret = set_page(priv, reg);
        if (ret < 0)
                goto out;

        ret = i2c_master_send(client, buf, cnt + 1);
        if (ret < 0)
                dev_err(&client->dev, "Error %d writing to 0x%x\n", ret, reg);
out:
        mutex_unlock(&priv->mutex);
}

static int
reg_read(struct tda998x_priv *priv, u16 reg)
{
        u8 val = 0;
        int ret;

        ret = reg_read_range(priv, reg, &val, sizeof(val));
        if (ret < 0)
                return ret;
        return val;
}

static void
reg_write(struct tda998x_priv *priv, u16 reg, u8 val)
{
        struct i2c_client *client = priv->hdmi;
        u8 buf[] = {REG2ADDR(reg), val};
        int ret;

        mutex_lock(&priv->mutex);
        ret = set_page(priv, reg);
        if (ret < 0)
                goto out;

        ret = i2c_master_send(client, buf, sizeof(buf));
        if (ret < 0)
                dev_err(&client->dev, "Error %d writing to 0x%x\n", ret, reg);
out:
        mutex_unlock(&priv->mutex);
}

static void
reg_write16(struct tda998x_priv *priv, u16 reg, u16 val)
{
        struct i2c_client *client = priv->hdmi;
        u8 buf[] = {REG2ADDR(reg), val >> 8, val};
        int ret;

        mutex_lock(&priv->mutex);
        ret = set_page(priv, reg);
        if (ret < 0)
                goto out;

        ret = i2c_master_send(client, buf, sizeof(buf));
        if (ret < 0)
                dev_err(&client->dev, "Error %d writing to 0x%x\n", ret, reg);
out:
        mutex_unlock(&priv->mutex);
}

static void
reg_set(struct tda998x_priv *priv, u16 reg, u8 val)
{
        int old_val;

        old_val = reg_read(priv, reg);
        if (old_val >= 0)
                reg_write(priv, reg, old_val | val);
}

static void
reg_clear(struct tda998x_priv *priv, u16 reg, u8 val)
{
        int old_val;

        old_val = reg_read(priv, reg);
        if (old_val >= 0)
                reg_write(priv, reg, old_val & ~val);
}

static void
tda998x_reset(struct tda998x_priv *priv)
{
        /* reset audio and i2c master: */
        reg_write(priv, REG_SOFTRESET, SOFTRESET_AUDIO | SOFTRESET_I2C_MASTER);
        msleep(50);
        reg_write(priv, REG_SOFTRESET, 0);
        msleep(50);

        /* reset transmitter: */
        reg_set(priv, REG_MAIN_CNTRL0, MAIN_CNTRL0_SR);
        reg_clear(priv, REG_MAIN_CNTRL0, MAIN_CNTRL0_SR);

        /* PLL registers common configuration */
        reg_write(priv, REG_PLL_SERIAL_1, 0x00);
        reg_write(priv, REG_PLL_SERIAL_2, PLL_SERIAL_2_SRL_NOSC(1));
        reg_write(priv, REG_PLL_SERIAL_3, 0x00);
        reg_write(priv, REG_SERIALIZER,   0x00);
        reg_write(priv, REG_BUFFER_OUT,   0x00);
        reg_write(priv, REG_PLL_SCG1,     0x00);
        reg_write(priv, REG_AUDIO_DIV,    AUDIO_DIV_SERCLK_8);
        reg_write(priv, REG_SEL_CLK,      SEL_CLK_SEL_CLK1 | SEL_CLK_ENA_SC_CLK);
        reg_write(priv, REG_PLL_SCGN1,    0xfa);
        reg_write(priv, REG_PLL_SCGN2,    0x00);
        reg_write(priv, REG_PLL_SCGR1,    0x5b);
        reg_write(priv, REG_PLL_SCGR2,    0x00);
        reg_write(priv, REG_PLL_SCG2,     0x10);

        /* Write the default value MUX register */
        reg_write(priv, REG_MUX_VP_VIP_OUT, 0x24);
}

/*
 * The TDA998x has a problem when trying to read the EDID close to a
 * HPD assertion: it needs a delay of 100ms to avoid timing out while
 * trying to read EDID data.
 *
 * However, tda998x_connector_get_modes() may be called at any moment
 * after tda998x_connector_detect() indicates that we are connected, so
 * we need to delay probing modes in tda998x_connector_get_modes() after
 * we have seen a HPD inactive->active transition.  This code implements
 * that delay.
 */
static void tda998x_edid_delay_done(struct timer_list *t)
{
        struct tda998x_priv *priv = timer_container_of(priv, t,
                                                       edid_delay_timer);

        priv->edid_delay_active = false;
        wake_up(&priv->edid_delay_waitq);
        schedule_work(&priv->detect_work);
}

static void tda998x_edid_delay_start(struct tda998x_priv *priv)
{
        priv->edid_delay_active = true;
        mod_timer(&priv->edid_delay_timer, jiffies + HZ/10);
}

static int tda998x_edid_delay_wait(struct tda998x_priv *priv)
{
        return wait_event_killable(priv->edid_delay_waitq, !priv->edid_delay_active);
}

/*
 * We need to run the KMS hotplug event helper outside of our threaded
 * interrupt routine as this can call back into our get_modes method,
 * which will want to make use of interrupts.
 */
static void tda998x_detect_work(struct work_struct *work)
{
        struct tda998x_priv *priv =
                container_of(work, struct tda998x_priv, detect_work);
        struct drm_device *dev = priv->connector.dev;

        if (dev)
                drm_kms_helper_hotplug_event(dev);
}

/*
 * only 2 interrupts may occur: screen plug/unplug and EDID read
 */
static irqreturn_t tda998x_irq_thread(int irq, void *data)
{
        struct tda998x_priv *priv = data;
        u8 sta, cec, lvl, flag0, flag1, flag2;
        bool handled = false;

        sta = cec_read(priv, REG_CEC_INTSTATUS);
        if (sta & CEC_INTSTATUS_HDMI) {
                cec = cec_read(priv, REG_CEC_RXSHPDINT);
                lvl = cec_read(priv, REG_CEC_RXSHPDLEV);
                flag0 = reg_read(priv, REG_INT_FLAGS_0);
                flag1 = reg_read(priv, REG_INT_FLAGS_1);
                flag2 = reg_read(priv, REG_INT_FLAGS_2);
                DRM_DEBUG_DRIVER(
                        "tda irq sta %02x cec %02x lvl %02x f0 %02x f1 %02x f2 %02x\n",
                        sta, cec, lvl, flag0, flag1, flag2);

                if (cec & CEC_RXSHPDINT_HPD) {
                        if (lvl & CEC_RXSHPDLEV_HPD) {
                                tda998x_edid_delay_start(priv);
                        } else {
                                schedule_work(&priv->detect_work);
                                cec_notifier_phys_addr_invalidate(
                                                priv->cec_notify);
                        }

                        handled = true;
                }

                if ((flag2 & INT_FLAGS_2_EDID_BLK_RD) && priv->wq_edid_wait) {
                        priv->wq_edid_wait = 0;
                        wake_up(&priv->wq_edid);
                        handled = true;
                }
        }

        return IRQ_RETVAL(handled);
}

static void
tda998x_write_if(struct tda998x_priv *priv, u8 bit, u16 addr,
                 union hdmi_infoframe *frame)
{
        u8 buf[MAX_WRITE_RANGE_BUF];
        ssize_t len;

        len = hdmi_infoframe_pack(frame, buf, sizeof(buf));
        if (len < 0) {
                dev_err(&priv->hdmi->dev,
                        "hdmi_infoframe_pack() type=0x%02x failed: %zd\n",
                        frame->any.type, len);
                return;
        }

        reg_clear(priv, REG_DIP_IF_FLAGS, bit);
        reg_write_range(priv, addr, buf, len);
        reg_set(priv, REG_DIP_IF_FLAGS, bit);
}

static void tda998x_write_aif(struct tda998x_priv *priv,
                              const struct hdmi_audio_infoframe *cea)
{
        union hdmi_infoframe frame;

        frame.audio = *cea;

        tda998x_write_if(priv, DIP_IF_FLAGS_IF4, REG_IF4_HB0, &frame);
}

static void
tda998x_write_avi(struct tda998x_priv *priv, const struct drm_display_mode *mode)
{
        union hdmi_infoframe frame;

        drm_hdmi_avi_infoframe_from_display_mode(&frame.avi,
                                                 &priv->connector, mode);
        frame.avi.quantization_range = HDMI_QUANTIZATION_RANGE_FULL;
        drm_hdmi_avi_infoframe_quant_range(&frame.avi, &priv->connector, mode,
                                           priv->rgb_quant_range);

        tda998x_write_if(priv, DIP_IF_FLAGS_IF2, REG_IF2_HB0, &frame);
}

static void tda998x_write_vsi(struct tda998x_priv *priv,
                              const struct drm_display_mode *mode)
{
        union hdmi_infoframe frame;

        if (drm_hdmi_vendor_infoframe_from_display_mode(&frame.vendor.hdmi,
                                                        &priv->connector,
                                                        mode))
                reg_clear(priv, REG_DIP_IF_FLAGS, DIP_IF_FLAGS_IF1);
        else
                tda998x_write_if(priv, DIP_IF_FLAGS_IF1, REG_IF1_HB0, &frame);
}

/* Audio support */

static const struct tda998x_audio_route tda998x_audio_route[AUDIO_ROUTE_NUM] = {
        [AUDIO_ROUTE_I2S] = {
                .ena_aclk = 1,
                .mux_ap = MUX_AP_SELECT_I2S,
                .aip_clksel = AIP_CLKSEL_AIP_I2S | AIP_CLKSEL_FS_ACLK,
        },
        [AUDIO_ROUTE_SPDIF] = {
                .ena_aclk = 0,
                .mux_ap = MUX_AP_SELECT_SPDIF,
                .aip_clksel = AIP_CLKSEL_AIP_SPDIF | AIP_CLKSEL_FS_FS64SPDIF,
        },
};

/* Configure the TDA998x audio data and clock routing. */
static int tda998x_derive_routing(struct tda998x_priv *priv,
                                  struct tda998x_audio_settings *s,
                                  unsigned int route)
{
        s->route = &tda998x_audio_route[route];
        s->ena_ap = priv->audio_port_enable[route];
        if (s->ena_ap == 0) {
                dev_err(&priv->hdmi->dev, "no audio configuration found\n");
                return -EINVAL;
        }

        return 0;
}

/*
 * The audio clock divisor register controls a divider producing Audio_Clk_Out
 * from SERclk by dividing it by 2^n where 0 <= n <= 5.  We don't know what
 * Audio_Clk_Out or SERclk are. We guess SERclk is the same as TMDS clock.
 *
 * It seems that Audio_Clk_Out must be the smallest value that is greater
 * than 128*fs, otherwise audio does not function. There is some suggestion
 * that 126*fs is a better value.
 */
static u8 tda998x_get_adiv(struct tda998x_priv *priv, unsigned int fs)
{
        unsigned long min_audio_clk = fs * 128;
        unsigned long ser_clk = priv->tmds_clock * 1000;
        u8 adiv;

        for (adiv = AUDIO_DIV_SERCLK_32; adiv != AUDIO_DIV_SERCLK_1; adiv--)
                if (ser_clk > min_audio_clk << adiv)
                        break;

        dev_dbg(&priv->hdmi->dev,
                "ser_clk=%luHz fs=%uHz min_aclk=%luHz adiv=%d\n",
                ser_clk, fs, min_audio_clk, adiv);

        return adiv;
}

/*
 * In auto-CTS mode, the TDA998x uses a "measured time stamp" counter to
 * generate the CTS value.  It appears that the "measured time stamp" is
 * the number of TDMS clock cycles within a number of audio input clock
 * cycles defined by the k and N parameters defined below, in a similar
 * way to that which is set out in the CTS generation in the HDMI spec.
 *
 *  tmdsclk ----> mts -> /m ---> CTS
 *                 ^
 *  sclk -> /k -> /N
 *
 * CTS = mts / m, where m is 2^M.
 * /k is a divider based on the K value below, K+1 for K < 4, or 8 for K >= 4
 * /N is a divider based on the HDMI specified N value.
 *
 * This produces the following equation:
 *  CTS = tmds_clock * k * N / (sclk * m)
 *
 * When combined with the sink-side equation, and realising that sclk is
 * bclk_ratio * fs, we end up with:
 *  k = m * bclk_ratio / 128.
 *
 * Note: S/PDIF always uses a bclk_ratio of 64.
 */
static int tda998x_derive_cts_n(struct tda998x_priv *priv,
                                struct tda998x_audio_settings *settings,
                                unsigned int ratio)
{
        switch (ratio) {
        case 16:
                settings->cts_n = CTS_N_M(3) | CTS_N_K(0);
                break;
        case 32:
                settings->cts_n = CTS_N_M(3) | CTS_N_K(1);
                break;
        case 48:
                settings->cts_n = CTS_N_M(3) | CTS_N_K(2);
                break;
        case 64:
                settings->cts_n = CTS_N_M(3) | CTS_N_K(3);
                break;
        case 128:
                settings->cts_n = CTS_N_M(0) | CTS_N_K(0);
                break;
        default:
                dev_err(&priv->hdmi->dev, "unsupported bclk ratio %ufs\n",
                        ratio);
                return -EINVAL;
        }
        return 0;
}

static void tda998x_audio_mute(struct tda998x_priv *priv, bool on)
{
        if (on) {
                reg_set(priv, REG_SOFTRESET, SOFTRESET_AUDIO);
                reg_clear(priv, REG_SOFTRESET, SOFTRESET_AUDIO);
                reg_set(priv, REG_AIP_CNTRL_0, AIP_CNTRL_0_RST_FIFO);
        } else {
                reg_clear(priv, REG_AIP_CNTRL_0, AIP_CNTRL_0_RST_FIFO);
        }
}

static void tda998x_configure_audio(struct tda998x_priv *priv)
{
        const struct tda998x_audio_settings *settings = &priv->audio;
        u8 buf[6], adiv;
        u32 n;

        /* If audio is not configured, there is nothing to do. */
        if (settings->ena_ap == 0)
                return;

        adiv = tda998x_get_adiv(priv, settings->sample_rate);

        /* Enable audio ports */
        reg_write(priv, REG_ENA_AP, settings->ena_ap);
        reg_write(priv, REG_ENA_ACLK, settings->route->ena_aclk);
        reg_write(priv, REG_MUX_AP, settings->route->mux_ap);
        reg_write(priv, REG_I2S_FORMAT, settings->i2s_format);
        reg_write(priv, REG_AIP_CLKSEL, settings->route->aip_clksel);
        reg_clear(priv, REG_AIP_CNTRL_0, AIP_CNTRL_0_LAYOUT |
                                        AIP_CNTRL_0_ACR_MAN);   /* auto CTS */
        reg_write(priv, REG_CTS_N, settings->cts_n);
        reg_write(priv, REG_AUDIO_DIV, adiv);

        /*
         * This is the approximate value of N, which happens to be
         * the recommended values for non-coherent clocks.
         */
        n = 128 * settings->sample_rate / 1000;

        /* Write the CTS and N values */
        buf[0] = 0x44;
        buf[1] = 0x42;
        buf[2] = 0x01;
        buf[3] = n;
        buf[4] = n >> 8;
        buf[5] = n >> 16;
        reg_write_range(priv, REG_ACR_CTS_0, buf, 6);

        /* Reset CTS generator */
        reg_set(priv, REG_AIP_CNTRL_0, AIP_CNTRL_0_RST_CTS);
        reg_clear(priv, REG_AIP_CNTRL_0, AIP_CNTRL_0_RST_CTS);

        /* Write the channel status
         * The REG_CH_STAT_B-registers skip IEC958 AES2 byte, because
         * there is a separate register for each I2S wire.
         */
        buf[0] = settings->status[0];
        buf[1] = settings->status[1];
        buf[2] = settings->status[3];
        buf[3] = settings->status[4];
        reg_write_range(priv, REG_CH_STAT_B(0), buf, 4);

        tda998x_audio_mute(priv, true);
        msleep(20);
        tda998x_audio_mute(priv, false);

        tda998x_write_aif(priv, &settings->cea);
}

static int tda998x_audio_hw_params(struct device *dev, void *data,
                                   struct hdmi_codec_daifmt *daifmt,
                                   struct hdmi_codec_params *params)
{
        struct tda998x_priv *priv = dev_get_drvdata(dev);
        unsigned int bclk_ratio;
        bool spdif = daifmt->fmt == HDMI_SPDIF;
        int ret;
        struct tda998x_audio_settings audio = {
                .sample_rate = params->sample_rate,
                .cea = params->cea,
        };

        memcpy(audio.status, params->iec.status,
               min(sizeof(audio.status), sizeof(params->iec.status)));

        switch (daifmt->fmt) {
        case HDMI_I2S:
                audio.i2s_format = I2S_FORMAT_PHILIPS;
                break;
        case HDMI_LEFT_J:
                audio.i2s_format = I2S_FORMAT_LEFT_J;
                break;
        case HDMI_RIGHT_J:
                audio.i2s_format = I2S_FORMAT_RIGHT_J;
                break;
        case HDMI_SPDIF:
                audio.i2s_format = 0;
                break;
        default:
                dev_err(dev, "%s: Invalid format %d\n", __func__, daifmt->fmt);
                return -EINVAL;
        }

        if (!spdif &&
            (daifmt->bit_clk_inv || daifmt->frame_clk_inv ||
             daifmt->bit_clk_provider || daifmt->frame_clk_provider)) {
                dev_err(dev, "%s: Bad flags %d %d %d %d\n", __func__,
                        daifmt->bit_clk_inv, daifmt->frame_clk_inv,
                        daifmt->bit_clk_provider,
                        daifmt->frame_clk_provider);
                return -EINVAL;
        }

        ret = tda998x_derive_routing(priv, &audio, AUDIO_ROUTE_I2S + spdif);
        if (ret < 0)
                return ret;

        bclk_ratio = spdif ? 64 : params->sample_width * 2;
        ret = tda998x_derive_cts_n(priv, &audio, bclk_ratio);
        if (ret < 0)
                return ret;

        mutex_lock(&priv->audio_mutex);
        priv->audio = audio;
        if (priv->supports_infoframes && priv->sink_has_audio)
                tda998x_configure_audio(priv);
        mutex_unlock(&priv->audio_mutex);

        return 0;
}

static void tda998x_audio_shutdown(struct device *dev, void *data)
{
        struct tda998x_priv *priv = dev_get_drvdata(dev);

        mutex_lock(&priv->audio_mutex);

        reg_write(priv, REG_ENA_AP, 0);
        priv->audio.ena_ap = 0;

        mutex_unlock(&priv->audio_mutex);
}

static int tda998x_audio_mute_stream(struct device *dev, void *data,
                                     bool enable, int direction)
{
        struct tda998x_priv *priv = dev_get_drvdata(dev);

        mutex_lock(&priv->audio_mutex);

        tda998x_audio_mute(priv, enable);

        mutex_unlock(&priv->audio_mutex);
        return 0;
}

static int tda998x_audio_get_eld(struct device *dev, void *data,
                                 uint8_t *buf, size_t len)
{
        struct tda998x_priv *priv = dev_get_drvdata(dev);

        mutex_lock(&priv->audio_mutex);
        memcpy(buf, priv->connector.eld,
               min(sizeof(priv->connector.eld), len));
        mutex_unlock(&priv->audio_mutex);

        return 0;
}

static const struct hdmi_codec_ops audio_codec_ops = {
        .hw_params = tda998x_audio_hw_params,
        .audio_shutdown = tda998x_audio_shutdown,
        .mute_stream = tda998x_audio_mute_stream,
        .get_eld = tda998x_audio_get_eld,
};

static int tda998x_audio_codec_init(struct tda998x_priv *priv,
                                    struct device *dev)
{
        struct hdmi_codec_pdata codec_data = {
                .ops = &audio_codec_ops,
                .max_i2s_channels = 2,
                .no_i2s_capture = 1,
                .no_spdif_capture = 1,
                .no_capture_mute = 1,
        };

        if (priv->audio_port_enable[AUDIO_ROUTE_I2S])
                codec_data.i2s = 1;
        if (priv->audio_port_enable[AUDIO_ROUTE_SPDIF])
                codec_data.spdif = 1;

        priv->audio_pdev = platform_device_register_data(
                dev, HDMI_CODEC_DRV_NAME, PLATFORM_DEVID_AUTO,
                &codec_data, sizeof(codec_data));

        return PTR_ERR_OR_ZERO(priv->audio_pdev);
}

/* DRM connector functions */

static enum drm_connector_status
tda998x_connector_detect(struct drm_connector *connector, bool force)
{
        struct tda998x_priv *priv = conn_to_tda998x_priv(connector);
        u8 val = cec_read(priv, REG_CEC_RXSHPDLEV);

        return (val & CEC_RXSHPDLEV_HPD) ? connector_status_connected :
                        connector_status_disconnected;
}

static void tda998x_connector_destroy(struct drm_connector *connector)
{
        drm_connector_cleanup(connector);
}

static const struct drm_connector_funcs tda998x_connector_funcs = {
        .reset = drm_atomic_helper_connector_reset,
        .fill_modes = drm_helper_probe_single_connector_modes,
        .detect = tda998x_connector_detect,
        .destroy = tda998x_connector_destroy,
        .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
        .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
};

static int read_edid_block(void *data, u8 *buf, unsigned int blk, size_t length)
{
        struct tda998x_priv *priv = data;
        u8 offset, segptr;
        int ret, i;

        offset = (blk & 1) ? 128 : 0;
        segptr = blk / 2;

        mutex_lock(&priv->edid_mutex);

        reg_write(priv, REG_DDC_ADDR, 0xa0);
        reg_write(priv, REG_DDC_OFFS, offset);
        reg_write(priv, REG_DDC_SEGM_ADDR, 0x60);
        reg_write(priv, REG_DDC_SEGM, segptr);

        /* enable reading EDID: */
        priv->wq_edid_wait = 1;
        reg_write(priv, REG_EDID_CTRL, 0x1);

        /* flag must be cleared by sw: */
        reg_write(priv, REG_EDID_CTRL, 0x0);

        /* wait for block read to complete: */
        if (priv->hdmi->irq) {
                i = wait_event_timeout(priv->wq_edid,
                                        !priv->wq_edid_wait,
                                        msecs_to_jiffies(100));
                if (i < 0) {
                        dev_err(&priv->hdmi->dev, "read edid wait err %d\n", i);
                        ret = i;
                        goto failed;
                }
        } else {
                for (i = 100; i > 0; i--) {
                        msleep(1);
                        ret = reg_read(priv, REG_INT_FLAGS_2);
                        if (ret < 0)
                                goto failed;
                        if (ret & INT_FLAGS_2_EDID_BLK_RD)
                                break;
                }
        }

        if (i == 0) {
                dev_err(&priv->hdmi->dev, "read edid timeout\n");
                ret = -ETIMEDOUT;
                goto failed;
        }

        ret = reg_read_range(priv, REG_EDID_DATA_0, buf, length);
        if (ret != length) {
                dev_err(&priv->hdmi->dev, "failed to read edid block %d: %d\n",
                        blk, ret);
                goto failed;
        }

        ret = 0;

 failed:
        mutex_unlock(&priv->edid_mutex);
        return ret;
}

static int tda998x_connector_get_modes(struct drm_connector *connector)
{
        struct tda998x_priv *priv = conn_to_tda998x_priv(connector);
        const struct drm_edid *drm_edid;
        int n;

        /*
         * If we get killed while waiting for the HPD timeout, return
         * no modes found: we are not in a restartable path, so we
         * can't handle signals gracefully.
         */
        if (tda998x_edid_delay_wait(priv))
                return 0;

        if (priv->rev == TDA19988)
                reg_clear(priv, REG_TX4, TX4_PD_RAM);

        drm_edid = drm_edid_read_custom(connector, read_edid_block, priv);

        if (priv->rev == TDA19988)
                reg_set(priv, REG_TX4, TX4_PD_RAM);

        drm_edid_connector_update(connector, drm_edid);
        cec_notifier_set_phys_addr(priv->cec_notify,
                                   connector->display_info.source_physical_address);

        if (!drm_edid) {
                dev_warn(&priv->hdmi->dev, "failed to read EDID\n");
                return 0;
        }

        mutex_lock(&priv->audio_mutex);
        n = drm_edid_connector_add_modes(connector);
        priv->sink_has_audio = connector->display_info.has_audio;
        mutex_unlock(&priv->audio_mutex);

        drm_edid_free(drm_edid);

        return n;
}

static struct drm_encoder *
tda998x_connector_best_encoder(struct drm_connector *connector)
{
        struct tda998x_priv *priv = conn_to_tda998x_priv(connector);

        return priv->bridge.encoder;
}

static
const struct drm_connector_helper_funcs tda998x_connector_helper_funcs = {
        .get_modes = tda998x_connector_get_modes,
        .best_encoder = tda998x_connector_best_encoder,
};

static int tda998x_connector_init(struct tda998x_priv *priv,
                                  struct drm_device *drm)
{
        struct drm_connector *connector = &priv->connector;
        int ret;

        connector->interlace_allowed = 1;

        if (priv->hdmi->irq)
                connector->polled = DRM_CONNECTOR_POLL_HPD;
        else
                connector->polled = DRM_CONNECTOR_POLL_CONNECT |
                        DRM_CONNECTOR_POLL_DISCONNECT;

        drm_connector_helper_add(connector, &tda998x_connector_helper_funcs);
        ret = drm_connector_init(drm, connector, &tda998x_connector_funcs,
                                 DRM_MODE_CONNECTOR_HDMIA);
        if (ret)
                return ret;

        drm_connector_attach_encoder(&priv->connector,
                                     priv->bridge.encoder);

        return 0;
}

/* DRM bridge functions */

static int tda998x_bridge_attach(struct drm_bridge *bridge,
                                 struct drm_encoder *encoder,
                                 enum drm_bridge_attach_flags flags)
{
        struct tda998x_priv *priv = bridge_to_tda998x_priv(bridge);

        if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) {
                DRM_ERROR("Fix bridge driver to make connector optional!");
                return -EINVAL;
        }

        return tda998x_connector_init(priv, bridge->dev);
}

static void tda998x_bridge_detach(struct drm_bridge *bridge)
{
        struct tda998x_priv *priv = bridge_to_tda998x_priv(bridge);

        drm_connector_cleanup(&priv->connector);
}

static enum drm_mode_status tda998x_bridge_mode_valid(struct drm_bridge *bridge,
                                     const struct drm_display_info *info,
                                     const struct drm_display_mode *mode)
{
        /* TDA19988 dotclock can go up to 165MHz */
        struct tda998x_priv *priv = bridge_to_tda998x_priv(bridge);

        if (mode->clock > ((priv->rev == TDA19988) ? 165000 : 150000))
                return MODE_CLOCK_HIGH;
        if (mode->htotal >= BIT(13))
                return MODE_BAD_HVALUE;
        if (mode->vtotal >= BIT(11))
                return MODE_BAD_VVALUE;
        return MODE_OK;
}

static void tda998x_bridge_enable(struct drm_bridge *bridge)
{
        struct tda998x_priv *priv = bridge_to_tda998x_priv(bridge);

        if (!priv->is_on) {
                /* enable video ports, audio will be enabled later */
                reg_write(priv, REG_ENA_VP_0, 0xff);
                reg_write(priv, REG_ENA_VP_1, 0xff);
                reg_write(priv, REG_ENA_VP_2, 0xff);
                /* set muxing after enabling ports: */
                reg_write(priv, REG_VIP_CNTRL_0, priv->vip_cntrl_0);
                reg_write(priv, REG_VIP_CNTRL_1, priv->vip_cntrl_1);
                reg_write(priv, REG_VIP_CNTRL_2, priv->vip_cntrl_2);

                priv->is_on = true;
        }
}

static void tda998x_bridge_disable(struct drm_bridge *bridge)
{
        struct tda998x_priv *priv = bridge_to_tda998x_priv(bridge);

        if (priv->is_on) {
                /* disable video ports */
                reg_write(priv, REG_ENA_VP_0, 0x00);
                reg_write(priv, REG_ENA_VP_1, 0x00);
                reg_write(priv, REG_ENA_VP_2, 0x00);

                priv->is_on = false;
        }
}

static void tda998x_bridge_mode_set(struct drm_bridge *bridge,
                                    const struct drm_display_mode *mode,
                                    const struct drm_display_mode *adjusted_mode)
{
        struct tda998x_priv *priv = bridge_to_tda998x_priv(bridge);
        unsigned long tmds_clock;
        u16 ref_pix, ref_line, n_pix, n_line;
        u16 hs_pix_s, hs_pix_e;
        u16 vs1_pix_s, vs1_pix_e, vs1_line_s, vs1_line_e;
        u16 vs2_pix_s, vs2_pix_e, vs2_line_s, vs2_line_e;
        u16 vwin1_line_s, vwin1_line_e;
        u16 vwin2_line_s, vwin2_line_e;
        u16 de_pix_s, de_pix_e;
        u8 reg, div, rep, sel_clk;

        /*
         * Since we are "computer" like, our source invariably produces
         * full-range RGB.  If the monitor supports full-range, then use
         * it, otherwise reduce to limited-range.
         */
        priv->rgb_quant_range =
                priv->connector.display_info.rgb_quant_range_selectable ?
                HDMI_QUANTIZATION_RANGE_FULL :
                drm_default_rgb_quant_range(adjusted_mode);

        /*
         * Internally TDA998x is using ITU-R BT.656 style sync but
         * we get VESA style sync. TDA998x is using a reference pixel
         * relative to ITU to sync to the input frame and for output
         * sync generation. Currently, we are using reference detection
         * from HS/VS, i.e. REFPIX/REFLINE denote frame start sync point
         * which is position of rising VS with coincident rising HS.
         *
         * Now there is some issues to take care of:
         * - HDMI data islands require sync-before-active
         * - TDA998x register values must be > 0 to be enabled
         * - REFLINE needs an additional offset of +1
         * - REFPIX needs an addtional offset of +1 for UYUV and +3 for RGB
         *
         * So we add +1 to all horizontal and vertical register values,
         * plus an additional +3 for REFPIX as we are using RGB input only.
         */
        n_pix        = mode->htotal;
        n_line       = mode->vtotal;

        hs_pix_e     = mode->hsync_end - mode->hdisplay;
        hs_pix_s     = mode->hsync_start - mode->hdisplay;
        de_pix_e     = mode->htotal;
        de_pix_s     = mode->htotal - mode->hdisplay;
        ref_pix      = 3 + hs_pix_s;

        /*
         * Attached LCD controllers may generate broken sync. Allow
         * those to adjust the position of the rising VS edge by adding
         * HSKEW to ref_pix.
         */
        if (adjusted_mode->flags & DRM_MODE_FLAG_HSKEW)
                ref_pix += adjusted_mode->hskew;

        if ((mode->flags & DRM_MODE_FLAG_INTERLACE) == 0) {
                ref_line     = 1 + mode->vsync_start - mode->vdisplay;
                vwin1_line_s = mode->vtotal - mode->vdisplay - 1;
                vwin1_line_e = vwin1_line_s + mode->vdisplay;
                vs1_pix_s    = vs1_pix_e = hs_pix_s;
                vs1_line_s   = mode->vsync_start - mode->vdisplay;
                vs1_line_e   = vs1_line_s +
                               mode->vsync_end - mode->vsync_start;
                vwin2_line_s = vwin2_line_e = 0;
                vs2_pix_s    = vs2_pix_e  = 0;
                vs2_line_s   = vs2_line_e = 0;
        } else {
                ref_line     = 1 + (mode->vsync_start - mode->vdisplay)/2;
                vwin1_line_s = (mode->vtotal - mode->vdisplay)/2;
                vwin1_line_e = vwin1_line_s + mode->vdisplay/2;
                vs1_pix_s    = vs1_pix_e = hs_pix_s;
                vs1_line_s   = (mode->vsync_start - mode->vdisplay)/2;
                vs1_line_e   = vs1_line_s +
                               (mode->vsync_end - mode->vsync_start)/2;
                vwin2_line_s = vwin1_line_s + mode->vtotal/2;
                vwin2_line_e = vwin2_line_s + mode->vdisplay/2;
                vs2_pix_s    = vs2_pix_e = hs_pix_s + mode->htotal/2;
                vs2_line_s   = vs1_line_s + mode->vtotal/2 ;
                vs2_line_e   = vs2_line_s +
                               (mode->vsync_end - mode->vsync_start)/2;
        }

        /*
         * Select pixel repeat depending on the double-clock flag
         * (which means we have to repeat each pixel once.)
         */
        rep = mode->flags & DRM_MODE_FLAG_DBLCLK ? 1 : 0;
        sel_clk = SEL_CLK_ENA_SC_CLK | SEL_CLK_SEL_CLK1 |
                  SEL_CLK_SEL_VRF_CLK(rep ? 2 : 0);

        /* the TMDS clock is scaled up by the pixel repeat */
        tmds_clock = mode->clock * (1 + rep);

        /*
         * The divisor is power-of-2. The TDA9983B datasheet gives
         * this as ranges of Msample/s, which is 10x the TMDS clock:
         *   0 - 800 to 1500 Msample/s
         *   1 - 400 to 800 Msample/s
         *   2 - 200 to 400 Msample/s
         *   3 - as 2 above
         */
        for (div = 0; div < 3; div++)
                if (80000 >> div <= tmds_clock)
                        break;

        mutex_lock(&priv->audio_mutex);

        priv->tmds_clock = tmds_clock;

        /* mute the audio FIFO: */
        reg_set(priv, REG_AIP_CNTRL_0, AIP_CNTRL_0_RST_FIFO);

        /* set HDMI HDCP mode off: */
        reg_write(priv, REG_TBG_CNTRL_1, TBG_CNTRL_1_DWIN_DIS);
        reg_clear(priv, REG_TX33, TX33_HDMI);
        reg_write(priv, REG_ENC_CNTRL, ENC_CNTRL_CTL_CODE(0));

        /* no pre-filter or interpolator: */
        reg_write(priv, REG_HVF_CNTRL_0, HVF_CNTRL_0_PREFIL(0) |
                        HVF_CNTRL_0_INTPOL(0));
        reg_set(priv, REG_FEAT_POWERDOWN, FEAT_POWERDOWN_PREFILT);
        reg_write(priv, REG_VIP_CNTRL_5, VIP_CNTRL_5_SP_CNT(0));
        reg_write(priv, REG_VIP_CNTRL_4, VIP_CNTRL_4_BLANKIT(0) |
                        VIP_CNTRL_4_BLC(0));

        reg_clear(priv, REG_PLL_SERIAL_1, PLL_SERIAL_1_SRL_MAN_IZ);
        reg_clear(priv, REG_PLL_SERIAL_3, PLL_SERIAL_3_SRL_CCIR |
                                          PLL_SERIAL_3_SRL_DE);
        reg_write(priv, REG_SERIALIZER, 0);
        reg_write(priv, REG_HVF_CNTRL_1, HVF_CNTRL_1_VQR(0));

        reg_write(priv, REG_RPT_CNTRL, RPT_CNTRL_REPEAT(rep));
        reg_write(priv, REG_SEL_CLK, sel_clk);
        reg_write(priv, REG_PLL_SERIAL_2, PLL_SERIAL_2_SRL_NOSC(div) |
                        PLL_SERIAL_2_SRL_PR(rep));

        /* set color matrix according to output rgb quant range */
        if (priv->rgb_quant_range == HDMI_QUANTIZATION_RANGE_LIMITED) {
                static u8 tda998x_full_to_limited_range[] = {
                        MAT_CONTRL_MAT_SC(2),
                        0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
                        0x03, 0x6f, 0x00, 0x00, 0x00, 0x00,
                        0x00, 0x00, 0x03, 0x6f, 0x00, 0x00,
                        0x00, 0x00, 0x00, 0x00, 0x03, 0x6f,
                        0x00, 0x40, 0x00, 0x40, 0x00, 0x40
                };
                reg_clear(priv, REG_FEAT_POWERDOWN, FEAT_POWERDOWN_CSC);
                reg_write_range(priv, REG_MAT_CONTRL,
                                tda998x_full_to_limited_range,
                                sizeof(tda998x_full_to_limited_range));
        } else {
                reg_write(priv, REG_MAT_CONTRL, MAT_CONTRL_MAT_BP |
                                        MAT_CONTRL_MAT_SC(1));
                reg_set(priv, REG_FEAT_POWERDOWN, FEAT_POWERDOWN_CSC);
        }

        /* set BIAS tmds value: */
        reg_write(priv, REG_ANA_GENERAL, 0x09);

        /*
         * Sync on rising HSYNC/VSYNC
         */
        reg = VIP_CNTRL_3_SYNC_HS;

        /*
         * TDA19988 requires high-active sync at input stage,
         * so invert low-active sync provided by master encoder here
         */
        if (mode->flags & DRM_MODE_FLAG_NHSYNC)
                reg |= VIP_CNTRL_3_H_TGL;
        if (mode->flags & DRM_MODE_FLAG_NVSYNC)
                reg |= VIP_CNTRL_3_V_TGL;
        reg_write(priv, REG_VIP_CNTRL_3, reg);

        reg_write(priv, REG_VIDFORMAT, 0x00);
        reg_write16(priv, REG_REFPIX_MSB, ref_pix);
        reg_write16(priv, REG_REFLINE_MSB, ref_line);
        reg_write16(priv, REG_NPIX_MSB, n_pix);
        reg_write16(priv, REG_NLINE_MSB, n_line);
        reg_write16(priv, REG_VS_LINE_STRT_1_MSB, vs1_line_s);
        reg_write16(priv, REG_VS_PIX_STRT_1_MSB, vs1_pix_s);
        reg_write16(priv, REG_VS_LINE_END_1_MSB, vs1_line_e);
        reg_write16(priv, REG_VS_PIX_END_1_MSB, vs1_pix_e);
        reg_write16(priv, REG_VS_LINE_STRT_2_MSB, vs2_line_s);
        reg_write16(priv, REG_VS_PIX_STRT_2_MSB, vs2_pix_s);
        reg_write16(priv, REG_VS_LINE_END_2_MSB, vs2_line_e);
        reg_write16(priv, REG_VS_PIX_END_2_MSB, vs2_pix_e);
        reg_write16(priv, REG_HS_PIX_START_MSB, hs_pix_s);
        reg_write16(priv, REG_HS_PIX_STOP_MSB, hs_pix_e);
        reg_write16(priv, REG_VWIN_START_1_MSB, vwin1_line_s);
        reg_write16(priv, REG_VWIN_END_1_MSB, vwin1_line_e);
        reg_write16(priv, REG_VWIN_START_2_MSB, vwin2_line_s);
        reg_write16(priv, REG_VWIN_END_2_MSB, vwin2_line_e);
        reg_write16(priv, REG_DE_START_MSB, de_pix_s);
        reg_write16(priv, REG_DE_STOP_MSB, de_pix_e);

        if (priv->rev == TDA19988) {
                /* let incoming pixels fill the active space (if any) */
                reg_write(priv, REG_ENABLE_SPACE, 0x00);
        }

        /*
         * Always generate sync polarity relative to input sync and
         * revert input stage toggled sync at output stage
         */
        reg = TBG_CNTRL_1_DWIN_DIS | TBG_CNTRL_1_TGL_EN;
        if (mode->flags & DRM_MODE_FLAG_NHSYNC)
                reg |= TBG_CNTRL_1_H_TGL;
        if (mode->flags & DRM_MODE_FLAG_NVSYNC)
                reg |= TBG_CNTRL_1_V_TGL;
        reg_write(priv, REG_TBG_CNTRL_1, reg);

        /* must be last register set: */
        reg_write(priv, REG_TBG_CNTRL_0, 0);

        /* CEA-861B section 6 says that:
         * CEA version 1 (CEA-861) has no support for infoframes.
         * CEA version 2 (CEA-861A) supports version 1 AVI infoframes,
         * and optional basic audio.
         * CEA version 3 (CEA-861B) supports version 1 and 2 AVI infoframes,
         * and optional digital audio, with audio infoframes.
         *
         * Since we only support generation of version 2 AVI infoframes,
         * ignore CEA version 2 and below (iow, behave as if we're a
         * CEA-861 source.)
         */
        priv->supports_infoframes = priv->connector.display_info.cea_rev >= 3;

        if (priv->supports_infoframes) {
                /* We need to turn HDMI HDCP stuff on to get audio through */
                reg &= ~TBG_CNTRL_1_DWIN_DIS;
                reg_write(priv, REG_TBG_CNTRL_1, reg);
                reg_write(priv, REG_ENC_CNTRL, ENC_CNTRL_CTL_CODE(1));
                reg_set(priv, REG_TX33, TX33_HDMI);

                tda998x_write_avi(priv, adjusted_mode);
                tda998x_write_vsi(priv, adjusted_mode);

                if (priv->sink_has_audio)
                        tda998x_configure_audio(priv);
        }

        mutex_unlock(&priv->audio_mutex);
}

static const struct drm_bridge_funcs tda998x_bridge_funcs = {
        .attach = tda998x_bridge_attach,
        .detach = tda998x_bridge_detach,
        .mode_valid = tda998x_bridge_mode_valid,
        .disable = tda998x_bridge_disable,
        .mode_set = tda998x_bridge_mode_set,
        .enable = tda998x_bridge_enable,
};

/* I2C driver functions */

static int tda998x_get_audio_ports(struct tda998x_priv *priv,
                                   struct device_node *np)
{
        const u32 *port_data;
        u32 size;
        int i;

        port_data = of_get_property(np, "audio-ports", &size);
        if (!port_data)
                return 0;

        size /= sizeof(u32);
        if (size > 2 * ARRAY_SIZE(priv->audio_port_enable) || size % 2 != 0) {
                dev_err(&priv->hdmi->dev,
                        "Bad number of elements in audio-ports dt-property\n");
                return -EINVAL;
        }

        size /= 2;

        for (i = 0; i < size; i++) {
                unsigned int route;
                u8 afmt = be32_to_cpup(&port_data[2*i]);
                u8 ena_ap = be32_to_cpup(&port_data[2*i+1]);

                switch (afmt) {
                case TDA998x_I2S:
                        route = AUDIO_ROUTE_I2S;
                        break;
                case TDA998x_SPDIF:
                        route = AUDIO_ROUTE_SPDIF;
                        break;
                default:
                        dev_err(&priv->hdmi->dev,
                                "Bad audio format %u\n", afmt);
                        return -EINVAL;
                }

                if (!ena_ap) {
                        dev_err(&priv->hdmi->dev, "invalid zero port config\n");
                        continue;
                }

                if (priv->audio_port_enable[route]) {
                        dev_err(&priv->hdmi->dev,
                                "%s format already configured\n",
                                route == AUDIO_ROUTE_SPDIF ? "SPDIF" : "I2S");
                        return -EINVAL;
                }

                priv->audio_port_enable[route] = ena_ap;
        }
        return 0;
}

static void tda998x_destroy(struct device *dev)
{
        struct tda998x_priv *priv = dev_get_drvdata(dev);

        drm_bridge_remove(&priv->bridge);

        /* disable all IRQs and free the IRQ handler */
        cec_write(priv, REG_CEC_RXSHPDINTENA, 0);
        reg_clear(priv, REG_INT_FLAGS_2, INT_FLAGS_2_EDID_BLK_RD);

        if (priv->audio_pdev)
                platform_device_unregister(priv->audio_pdev);

        if (priv->hdmi->irq)
                free_irq(priv->hdmi->irq, priv);

        timer_delete_sync(&priv->edid_delay_timer);
        cancel_work_sync(&priv->detect_work);

        i2c_unregister_device(priv->cec);

        cec_notifier_conn_unregister(priv->cec_notify);
}

static int tda998x_create(struct device *dev)
{
        struct i2c_client *client = to_i2c_client(dev);
        struct device_node *np = client->dev.of_node;
        struct i2c_board_info cec_info;
        struct tda998x_priv *priv;
        u32 video;
        int rev_lo, rev_hi, ret;

        priv = devm_drm_bridge_alloc(dev, struct tda998x_priv, bridge, &tda998x_bridge_funcs);
        if (IS_ERR(priv))
                return PTR_ERR(priv);

        dev_set_drvdata(dev, priv);

        mutex_init(&priv->mutex);       /* protect the page access */
        mutex_init(&priv->audio_mutex); /* protect access from audio thread */
        mutex_init(&priv->edid_mutex);
        INIT_LIST_HEAD(&priv->bridge.list);
        init_waitqueue_head(&priv->edid_delay_waitq);
        timer_setup(&priv->edid_delay_timer, tda998x_edid_delay_done, 0);
        INIT_WORK(&priv->detect_work, tda998x_detect_work);

        priv->vip_cntrl_0 = VIP_CNTRL_0_SWAP_A(2) | VIP_CNTRL_0_SWAP_B(3);
        priv->vip_cntrl_1 = VIP_CNTRL_1_SWAP_C(0) | VIP_CNTRL_1_SWAP_D(1);
        priv->vip_cntrl_2 = VIP_CNTRL_2_SWAP_E(4) | VIP_CNTRL_2_SWAP_F(5);

        /* CEC I2C address bound to TDA998x I2C addr by configuration pins */
        priv->cec_addr = 0x34 + (client->addr & 0x03);
        priv->current_page = 0xff;
        priv->hdmi = client;

        /* wake up the device: */
        cec_write(priv, REG_CEC_ENAMODS,
                        CEC_ENAMODS_EN_RXSENS | CEC_ENAMODS_EN_HDMI);

        tda998x_reset(priv);

        /* read version: */
        rev_lo = reg_read(priv, REG_VERSION_LSB);
        if (rev_lo < 0) {
                dev_err(dev, "failed to read version: %d\n", rev_lo);
                return rev_lo;
        }

        rev_hi = reg_read(priv, REG_VERSION_MSB);
        if (rev_hi < 0) {
                dev_err(dev, "failed to read version: %d\n", rev_hi);
                return rev_hi;
        }

        priv->rev = rev_lo | rev_hi << 8;

        /* mask off feature bits: */
        priv->rev &= ~0x30; /* not-hdcp and not-scalar bit */

        switch (priv->rev) {
        case TDA9989N2:
                dev_info(dev, "found TDA9989 n2");
                break;
        case TDA19989:
                dev_info(dev, "found TDA19989");
                break;
        case TDA19989N2:
                dev_info(dev, "found TDA19989 n2");
                break;
        case TDA19988:
                dev_info(dev, "found TDA19988");
                break;
        default:
                dev_err(dev, "found unsupported device: %04x\n", priv->rev);
                return -ENXIO;
        }

        /* after reset, enable DDC: */
        reg_write(priv, REG_DDC_DISABLE, 0x00);

        /* set clock on DDC channel: */
        reg_write(priv, REG_TX3, 39);

        /* if necessary, disable multi-master: */
        if (priv->rev == TDA19989)
                reg_set(priv, REG_I2C_MASTER, I2C_MASTER_DIS_MM);

        cec_write(priv, REG_CEC_FRO_IM_CLK_CTRL,
                        CEC_FRO_IM_CLK_CTRL_GHOST_DIS | CEC_FRO_IM_CLK_CTRL_IMCLK_SEL);

        /* ensure interrupts are disabled */
        cec_write(priv, REG_CEC_RXSHPDINTENA, 0);

        /* clear pending interrupts */
        cec_read(priv, REG_CEC_RXSHPDINT);
        reg_read(priv, REG_INT_FLAGS_0);
        reg_read(priv, REG_INT_FLAGS_1);
        reg_read(priv, REG_INT_FLAGS_2);

        /* initialize the optional IRQ */
        if (client->irq) {
                unsigned long irq_flags;

                /* init read EDID waitqueue and HDP work */
                init_waitqueue_head(&priv->wq_edid);

                irq_flags =
                        irqd_get_trigger_type(irq_get_irq_data(client->irq));

                priv->cec_glue.irq_flags = irq_flags;

                irq_flags |= IRQF_SHARED | IRQF_ONESHOT;
                ret = request_threaded_irq(client->irq, NULL,
                                           tda998x_irq_thread, irq_flags,
                                           "tda998x", priv);
                if (ret) {
                        dev_err(dev, "failed to request IRQ#%u: %d\n",
                                client->irq, ret);
                        goto err_irq;
                }

                /* enable HPD irq */
                cec_write(priv, REG_CEC_RXSHPDINTENA, CEC_RXSHPDLEV_HPD);
        }

        priv->cec_notify = cec_notifier_conn_register(dev, NULL, NULL);
        if (!priv->cec_notify) {
                ret = -ENOMEM;
                goto fail;
        }

        priv->cec_glue.parent = dev;
        priv->cec_glue.data = priv;
        priv->cec_glue.init = tda998x_cec_hook_init;
        priv->cec_glue.exit = tda998x_cec_hook_exit;
        priv->cec_glue.open = tda998x_cec_hook_open;
        priv->cec_glue.release = tda998x_cec_hook_release;

        /*
         * Some TDA998x are actually two I2C devices merged onto one piece
         * of silicon: TDA9989 and TDA19989 combine the HDMI transmitter
         * with a slightly modified TDA9950 CEC device.  The CEC device
         * is at the TDA9950 address, with the address pins strapped across
         * to the TDA998x address pins.  Hence, it always has the same
         * offset.
         */
        memset(&cec_info, 0, sizeof(cec_info));
        strscpy(cec_info.type, "tda9950", sizeof(cec_info.type));
        cec_info.addr = priv->cec_addr;
        cec_info.platform_data = &priv->cec_glue;
        cec_info.irq = client->irq;

        priv->cec = i2c_new_client_device(client->adapter, &cec_info);
        if (IS_ERR(priv->cec)) {
                ret = PTR_ERR(priv->cec);
                goto fail;
        }

        /* enable EDID read irq: */
        reg_set(priv, REG_INT_FLAGS_2, INT_FLAGS_2_EDID_BLK_RD);

        if (np) {
                /* get the device tree parameters */
                ret = of_property_read_u32(np, "video-ports", &video);
                if (ret == 0) {
                        priv->vip_cntrl_0 = video >> 16;
                        priv->vip_cntrl_1 = video >> 8;
                        priv->vip_cntrl_2 = video;
                }

                ret = tda998x_get_audio_ports(priv, np);
                if (ret)
                        goto fail;

                if (priv->audio_port_enable[AUDIO_ROUTE_I2S] ||
                    priv->audio_port_enable[AUDIO_ROUTE_SPDIF])
                        tda998x_audio_codec_init(priv, &client->dev);
        }

#ifdef CONFIG_OF
        priv->bridge.of_node = dev->of_node;
#endif

        drm_bridge_add(&priv->bridge);

        return 0;

fail:
        tda998x_destroy(dev);
err_irq:
        return ret;
}

/* DRM encoder functions */

static int tda998x_encoder_init(struct device *dev, struct drm_device *drm)
{
        struct tda998x_priv *priv = dev_get_drvdata(dev);
        u32 crtcs = 0;
        int ret;

        if (dev->of_node)
                crtcs = drm_of_find_possible_crtcs(drm, dev->of_node);

        /* If no CRTCs were found, fall back to our old behaviour */
        if (crtcs == 0) {
                dev_warn(dev, "Falling back to first CRTC\n");
                crtcs = 1 << 0;
        }

        priv->encoder.possible_crtcs = crtcs;

        ret = drm_simple_encoder_init(drm, &priv->encoder,
                                      DRM_MODE_ENCODER_TMDS);
        if (ret)
                goto err_encoder;

        ret = drm_bridge_attach(&priv->encoder, &priv->bridge, NULL, 0);
        if (ret)
                goto err_bridge;

        return 0;

err_bridge:
        drm_encoder_cleanup(&priv->encoder);
err_encoder:
        return ret;
}

static int tda998x_bind(struct device *dev, struct device *master, void *data)
{
        struct drm_device *drm = data;

        return tda998x_encoder_init(dev, drm);
}

static void tda998x_unbind(struct device *dev, struct device *master,
                           void *data)
{
        struct tda998x_priv *priv = dev_get_drvdata(dev);

        drm_encoder_cleanup(&priv->encoder);
}

static const struct component_ops tda998x_ops = {
        .bind = tda998x_bind,
        .unbind = tda998x_unbind,
};

static int
tda998x_probe(struct i2c_client *client)
{
        int ret;

        if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
                dev_warn(&client->dev, "adapter does not support I2C\n");
                return -EIO;
        }

        ret = tda998x_create(&client->dev);
        if (ret)
                return ret;

        ret = component_add(&client->dev, &tda998x_ops);
        if (ret)
                tda998x_destroy(&client->dev);
        return ret;
}

static void tda998x_remove(struct i2c_client *client)
{
        component_del(&client->dev, &tda998x_ops);
        tda998x_destroy(&client->dev);
}

#ifdef CONFIG_OF
static const struct of_device_id tda998x_dt_ids[] = {
        { .compatible = "nxp,tda998x", },
        { }
};
MODULE_DEVICE_TABLE(of, tda998x_dt_ids);
#endif

static const struct i2c_device_id tda998x_ids[] = {
        { "tda998x" },
        { }
};
MODULE_DEVICE_TABLE(i2c, tda998x_ids);

static struct i2c_driver tda998x_driver = {
        .probe = tda998x_probe,
        .remove = tda998x_remove,
        .driver = {
                .name = "tda998x",
                .of_match_table = of_match_ptr(tda998x_dt_ids),
        },
        .id_table = tda998x_ids,
};

module_i2c_driver(tda998x_driver);

MODULE_AUTHOR("Rob Clark <robdclark@gmail.com");
MODULE_DESCRIPTION("NXP Semiconductors TDA998X HDMI Encoder");
MODULE_LICENSE("GPL");