/*
 * Copyright © 2006 Intel Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *
 * Authors:
 *    Eric Anholt <eric@anholt.net>
 *
 */

#include "dvo.h"

#define CH7017_TV_DISPLAY_MODE          0x00
#define CH7017_FLICKER_FILTER           0x01
#define CH7017_VIDEO_BANDWIDTH          0x02
#define CH7017_TEXT_ENHANCEMENT         0x03
#define CH7017_START_ACTIVE_VIDEO       0x04
#define CH7017_HORIZONTAL_POSITION      0x05
#define CH7017_VERTICAL_POSITION        0x06
#define CH7017_BLACK_LEVEL              0x07
#define CH7017_CONTRAST_ENHANCEMENT     0x08
#define CH7017_TV_PLL                   0x09
#define CH7017_TV_PLL_M                 0x0a
#define CH7017_TV_PLL_N                 0x0b
#define CH7017_SUB_CARRIER_0            0x0c
#define CH7017_CIV_CONTROL              0x10
#define CH7017_CIV_0                    0x11
#define CH7017_CHROMA_BOOST             0x14
#define CH7017_CLOCK_MODE               0x1c
#define CH7017_INPUT_CLOCK              0x1d
#define CH7017_GPIO_CONTROL             0x1e
#define CH7017_INPUT_DATA_FORMAT        0x1f
#define CH7017_CONNECTION_DETECT        0x20
#define CH7017_DAC_CONTROL              0x21
#define CH7017_BUFFERED_CLOCK_OUTPUT    0x22
#define CH7017_DEFEAT_VSYNC             0x47
#define CH7017_TEST_PATTERN             0x48

#define CH7017_POWER_MANAGEMENT         0x49
/** Enables the TV output path. */
#define CH7017_TV_EN                    (1 << 0)
#define CH7017_DAC0_POWER_DOWN          (1 << 1)
#define CH7017_DAC1_POWER_DOWN          (1 << 2)
#define CH7017_DAC2_POWER_DOWN          (1 << 3)
#define CH7017_DAC3_POWER_DOWN          (1 << 4)
/** Powers down the TV out block, and DAC0-3 */
#define CH7017_TV_POWER_DOWN_EN         (1 << 5)

#define CH7017_VERSION_ID               0x4a

#define CH7017_DEVICE_ID                0x4b
#define CH7017_DEVICE_ID_VALUE          0x1b
#define CH7018_DEVICE_ID_VALUE          0x1a
#define CH7019_DEVICE_ID_VALUE          0x19

#define CH7017_XCLK_D2_ADJUST           0x53
#define CH7017_UP_SCALER_COEFF_0        0x55
#define CH7017_UP_SCALER_COEFF_1        0x56
#define CH7017_UP_SCALER_COEFF_2        0x57
#define CH7017_UP_SCALER_COEFF_3        0x58
#define CH7017_UP_SCALER_COEFF_4        0x59
#define CH7017_UP_SCALER_VERTICAL_INC_0 0x5a
#define CH7017_UP_SCALER_VERTICAL_INC_1 0x5b
#define CH7017_GPIO_INVERT              0x5c
#define CH7017_UP_SCALER_HORIZONTAL_INC_0       0x5d
#define CH7017_UP_SCALER_HORIZONTAL_INC_1       0x5e

#define CH7017_HORIZONTAL_ACTIVE_PIXEL_INPUT    0x5f
/**< Low bits of horizontal active pixel input */

#define CH7017_ACTIVE_INPUT_LINE_OUTPUT 0x60
/** High bits of horizontal active pixel input */
#define CH7017_LVDS_HAP_INPUT_MASK      (0x7 << 0)
/** High bits of vertical active line output */
#define CH7017_LVDS_VAL_HIGH_MASK       (0x7 << 3)

#define CH7017_VERTICAL_ACTIVE_LINE_OUTPUT      0x61
/**< Low bits of vertical active line output */

#define CH7017_HORIZONTAL_ACTIVE_PIXEL_OUTPUT   0x62
/**< Low bits of horizontal active pixel output */

#define CH7017_LVDS_POWER_DOWN          0x63
/** High bits of horizontal active pixel output */
#define CH7017_LVDS_HAP_HIGH_MASK       (0x7 << 0)
/** Enables the LVDS power down state transition */
#define CH7017_LVDS_POWER_DOWN_EN       (1 << 6)
/** Enables the LVDS upscaler */
#define CH7017_LVDS_UPSCALER_EN         (1 << 7)
#define CH7017_LVDS_POWER_DOWN_DEFAULT_RESERVED 0x08

#define CH7017_LVDS_ENCODING            0x64
#define CH7017_LVDS_DITHER_2D           (1 << 2)
#define CH7017_LVDS_DITHER_DIS          (1 << 3)
#define CH7017_LVDS_DUAL_CHANNEL_EN     (1 << 4)
#define CH7017_LVDS_24_BIT              (1 << 5)

#define CH7017_LVDS_ENCODING_2          0x65

#define CH7017_LVDS_PLL_CONTROL         0x66
/** Enables the LVDS panel output path */
#define CH7017_LVDS_PANEN               (1 << 0)
/** Enables the LVDS panel backlight */
#define CH7017_LVDS_BKLEN               (1 << 3)

#define CH7017_POWER_SEQUENCING_T1      0x67
#define CH7017_POWER_SEQUENCING_T2      0x68
#define CH7017_POWER_SEQUENCING_T3      0x69
#define CH7017_POWER_SEQUENCING_T4      0x6a
#define CH7017_POWER_SEQUENCING_T5      0x6b
#define CH7017_GPIO_DRIVER_TYPE         0x6c
#define CH7017_GPIO_DATA                0x6d
#define CH7017_GPIO_DIRECTION_CONTROL   0x6e

#define CH7017_LVDS_PLL_FEEDBACK_DIV    0x71
# define CH7017_LVDS_PLL_FEED_BACK_DIVIDER_SHIFT 4
# define CH7017_LVDS_PLL_FEED_FORWARD_DIVIDER_SHIFT 0
# define CH7017_LVDS_PLL_FEEDBACK_DEFAULT_RESERVED 0x80

#define CH7017_LVDS_PLL_VCO_CONTROL     0x72
# define CH7017_LVDS_PLL_VCO_DEFAULT_RESERVED 0x80
# define CH7017_LVDS_PLL_VCO_SHIFT      4
# define CH7017_LVDS_PLL_POST_SCALE_DIV_SHIFT 0

#define CH7017_OUTPUTS_ENABLE           0x73
# define CH7017_CHARGE_PUMP_LOW         0x0
# define CH7017_CHARGE_PUMP_HIGH        0x3
# define CH7017_LVDS_CHANNEL_A          (1 << 3)
# define CH7017_LVDS_CHANNEL_B          (1 << 4)
# define CH7017_TV_DAC_A                (1 << 5)
# define CH7017_TV_DAC_B                (1 << 6)
# define CH7017_DDC_SELECT_DC2          (1 << 7)

#define CH7017_LVDS_OUTPUT_AMPLITUDE    0x74
#define CH7017_LVDS_PLL_EMI_REDUCTION   0x75
#define CH7017_LVDS_POWER_DOWN_FLICKER  0x76

#define CH7017_LVDS_CONTROL_2           0x78
# define CH7017_LOOP_FILTER_SHIFT       5
# define CH7017_PHASE_DETECTOR_SHIFT    0

#define CH7017_BANG_LIMIT_CONTROL       0x7f

struct ch7017_priv {
        uint8_t dummy;
};

static void ch7017_dump_regs(struct intel_dvo_device *dvo);
static void ch7017_dpms(struct intel_dvo_device *dvo, bool enable);

static bool ch7017_read(struct intel_dvo_device *dvo, u8 addr, u8 *val)
{
        struct i2c_msg msgs[] = {
                {
                        .addr = dvo->slave_addr,
                        .flags = 0,
                        .len = 1,
                        .buf = &addr,
                },
                {
                        .addr = dvo->slave_addr,
                        .flags = I2C_M_RD,
                        .len = 1,
                        .buf = val,
                }
        };
        return i2c_transfer(dvo->i2c_bus, msgs, 2) == 2;
}

static bool ch7017_write(struct intel_dvo_device *dvo, u8 addr, u8 val)
{
        uint8_t buf[2] = { addr, val };
        struct i2c_msg msg = {
                .addr = dvo->slave_addr,
                .flags = 0,
                .len = 2,
                .buf = buf,
        };
        return i2c_transfer(dvo->i2c_bus, &msg, 1) == 1;
}

/** Probes for a CH7017 on the given bus and slave address. */
static bool ch7017_init(struct intel_dvo_device *dvo,
                        struct i2c_adapter *adapter)
{
        struct ch7017_priv *priv;
        const char *str;
        u8 val;

        priv = kzalloc(sizeof(struct ch7017_priv), GFP_KERNEL);
        if (priv == NULL)
                return false;

        dvo->i2c_bus = adapter;
        dvo->dev_priv = priv;

        if (!ch7017_read(dvo, CH7017_DEVICE_ID, &val))
                goto fail;

        switch (val) {
        case CH7017_DEVICE_ID_VALUE:
                str = "ch7017";
                break;
        case CH7018_DEVICE_ID_VALUE:
                str = "ch7018";
                break;
        case CH7019_DEVICE_ID_VALUE:
                str = "ch7019";
                break;
        default:
                DRM_DEBUG_KMS("ch701x not detected, got %d: from %s "
                              "slave %d.\n",
                              val, adapter->name, dvo->slave_addr);
                goto fail;
        }

        DRM_DEBUG_KMS("%s detected on %s, addr %d\n",
                      str, adapter->name, dvo->slave_addr);
        return true;

fail:
        kfree(priv);
        return false;
}

static enum drm_connector_status ch7017_detect(struct intel_dvo_device *dvo)
{
        return connector_status_connected;
}

static enum drm_mode_status ch7017_mode_valid(struct intel_dvo_device *dvo,
                                              struct drm_display_mode *mode)
{
        if (mode->clock > 160000)
                return MODE_CLOCK_HIGH;

        return MODE_OK;
}

static void ch7017_mode_set(struct intel_dvo_device *dvo,
                            const struct drm_display_mode *mode,
                            const struct drm_display_mode *adjusted_mode)
{
        uint8_t lvds_pll_feedback_div, lvds_pll_vco_control;
        uint8_t outputs_enable, lvds_control_2, lvds_power_down;
        uint8_t horizontal_active_pixel_input;
        uint8_t horizontal_active_pixel_output, vertical_active_line_output;
        uint8_t active_input_line_output;

        DRM_DEBUG_KMS("Registers before mode setting\n");
        ch7017_dump_regs(dvo);

        /* LVDS PLL settings from page 75 of 7017-7017ds.pdf*/
        if (mode->clock < 100000) {
                outputs_enable = CH7017_LVDS_CHANNEL_A | CH7017_CHARGE_PUMP_LOW;
                lvds_pll_feedback_div = CH7017_LVDS_PLL_FEEDBACK_DEFAULT_RESERVED |
                        (2 << CH7017_LVDS_PLL_FEED_BACK_DIVIDER_SHIFT) |
                        (13 << CH7017_LVDS_PLL_FEED_FORWARD_DIVIDER_SHIFT);
                lvds_pll_vco_control = CH7017_LVDS_PLL_VCO_DEFAULT_RESERVED |
                        (2 << CH7017_LVDS_PLL_VCO_SHIFT) |
                        (3 << CH7017_LVDS_PLL_POST_SCALE_DIV_SHIFT);
                lvds_control_2 = (1 << CH7017_LOOP_FILTER_SHIFT) |
                        (0 << CH7017_PHASE_DETECTOR_SHIFT);
        } else {
                outputs_enable = CH7017_LVDS_CHANNEL_A | CH7017_CHARGE_PUMP_HIGH;
                lvds_pll_feedback_div =
                        CH7017_LVDS_PLL_FEEDBACK_DEFAULT_RESERVED |
                        (2 << CH7017_LVDS_PLL_FEED_BACK_DIVIDER_SHIFT) |
                        (3 << CH7017_LVDS_PLL_FEED_FORWARD_DIVIDER_SHIFT);
                lvds_control_2 = (3 << CH7017_LOOP_FILTER_SHIFT) |
                        (0 << CH7017_PHASE_DETECTOR_SHIFT);
                if (1) { /* XXX: dual channel panel detection.  Assume yes for now. */
                        outputs_enable |= CH7017_LVDS_CHANNEL_B;
                        lvds_pll_vco_control = CH7017_LVDS_PLL_VCO_DEFAULT_RESERVED |
                                (2 << CH7017_LVDS_PLL_VCO_SHIFT) |
                                (13 << CH7017_LVDS_PLL_POST_SCALE_DIV_SHIFT);
                } else {
                        lvds_pll_vco_control = CH7017_LVDS_PLL_VCO_DEFAULT_RESERVED |
                                (1 << CH7017_LVDS_PLL_VCO_SHIFT) |
                                (13 << CH7017_LVDS_PLL_POST_SCALE_DIV_SHIFT);
                }
        }

        horizontal_active_pixel_input = mode->hdisplay & 0x00ff;

        vertical_active_line_output = mode->vdisplay & 0x00ff;
        horizontal_active_pixel_output = mode->hdisplay & 0x00ff;

        active_input_line_output = ((mode->hdisplay & 0x0700) >> 8) |
                                   (((mode->vdisplay & 0x0700) >> 8) << 3);

        lvds_power_down = CH7017_LVDS_POWER_DOWN_DEFAULT_RESERVED |
                          (mode->hdisplay & 0x0700) >> 8;

        ch7017_dpms(dvo, false);
        ch7017_write(dvo, CH7017_HORIZONTAL_ACTIVE_PIXEL_INPUT,
                        horizontal_active_pixel_input);
        ch7017_write(dvo, CH7017_HORIZONTAL_ACTIVE_PIXEL_OUTPUT,
                        horizontal_active_pixel_output);
        ch7017_write(dvo, CH7017_VERTICAL_ACTIVE_LINE_OUTPUT,
                        vertical_active_line_output);
        ch7017_write(dvo, CH7017_ACTIVE_INPUT_LINE_OUTPUT,
                        active_input_line_output);
        ch7017_write(dvo, CH7017_LVDS_PLL_VCO_CONTROL, lvds_pll_vco_control);
        ch7017_write(dvo, CH7017_LVDS_PLL_FEEDBACK_DIV, lvds_pll_feedback_div);
        ch7017_write(dvo, CH7017_LVDS_CONTROL_2, lvds_control_2);
        ch7017_write(dvo, CH7017_OUTPUTS_ENABLE, outputs_enable);

        /* Turn the LVDS back on with new settings. */
        ch7017_write(dvo, CH7017_LVDS_POWER_DOWN, lvds_power_down);

        DRM_DEBUG_KMS("Registers after mode setting\n");
        ch7017_dump_regs(dvo);
}

/* set the CH7017 power state */
static void ch7017_dpms(struct intel_dvo_device *dvo, bool enable)
{
        uint8_t val;

        ch7017_read(dvo, CH7017_LVDS_POWER_DOWN, &val);

        /* Turn off TV/VGA, and never turn it on since we don't support it. */
        ch7017_write(dvo, CH7017_POWER_MANAGEMENT,
                        CH7017_DAC0_POWER_DOWN |
                        CH7017_DAC1_POWER_DOWN |
                        CH7017_DAC2_POWER_DOWN |
                        CH7017_DAC3_POWER_DOWN |
                        CH7017_TV_POWER_DOWN_EN);

        if (enable) {
                /* Turn on the LVDS */
                ch7017_write(dvo, CH7017_LVDS_POWER_DOWN,
                             val & ~CH7017_LVDS_POWER_DOWN_EN);
        } else {
                /* Turn off the LVDS */
                ch7017_write(dvo, CH7017_LVDS_POWER_DOWN,
                             val | CH7017_LVDS_POWER_DOWN_EN);
        }

        /* XXX: Should actually wait for update power status somehow */
        msleep(20);
}

static bool ch7017_get_hw_state(struct intel_dvo_device *dvo)
{
        uint8_t val;

        ch7017_read(dvo, CH7017_LVDS_POWER_DOWN, &val);

        if (val & CH7017_LVDS_POWER_DOWN_EN)
                return false;
        else
                return true;
}

static void ch7017_dump_regs(struct intel_dvo_device *dvo)
{
        uint8_t val;

#define DUMP(reg)                                       \
do {                                                    \
        ch7017_read(dvo, reg, &val);                    \
        DRM_DEBUG_KMS(#reg ": %02x\n", val);            \
} while (0)

        DUMP(CH7017_HORIZONTAL_ACTIVE_PIXEL_INPUT);
        DUMP(CH7017_HORIZONTAL_ACTIVE_PIXEL_OUTPUT);
        DUMP(CH7017_VERTICAL_ACTIVE_LINE_OUTPUT);
        DUMP(CH7017_ACTIVE_INPUT_LINE_OUTPUT);
        DUMP(CH7017_LVDS_PLL_VCO_CONTROL);
        DUMP(CH7017_LVDS_PLL_FEEDBACK_DIV);
        DUMP(CH7017_LVDS_CONTROL_2);
        DUMP(CH7017_OUTPUTS_ENABLE);
        DUMP(CH7017_LVDS_POWER_DOWN);
}

static void ch7017_destroy(struct intel_dvo_device *dvo)
{
        struct ch7017_priv *priv = dvo->dev_priv;

        if (priv) {
                kfree(priv);
                dvo->dev_priv = NULL;
        }
}

const struct intel_dvo_dev_ops ch7017_ops = {
        .init = ch7017_init,
        .detect = ch7017_detect,
        .mode_valid = ch7017_mode_valid,
        .mode_set = ch7017_mode_set,
        .dpms = ch7017_dpms,
        .get_hw_state = ch7017_get_hw_state,
        .dump_regs = ch7017_dump_regs,
        .destroy = ch7017_destroy,
};