dvo_ch7xxx.c

Go to the documentation of this file.

/**************************************************************************

Copyright © 2006 Dave Airlie

All Rights Reserved.

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, sub license, 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 NON-INFRINGEMENT.
IN NO EVENT SHALL THE AUTHOR 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.

**************************************************************************/

#include "dvo.h"

#define CH7xxx_REG_VID      0x4a
#define CH7xxx_REG_DID      0x4b

#define CH7011_VID      0x83 /* 7010 as well */
#define CH7009A_VID     0x84
#define CH7009B_VID     0x85
#define CH7301_VID      0x95

#define CH7xxx_VID      0x84
#define CH7xxx_DID      0x17

#define CH7xxx_NUM_REGS     0x4c

#define CH7xxx_CM       0x1c
#define CH7xxx_CM_XCM       (1<<0)
#define CH7xxx_CM_MCP       (1<<2)
#define CH7xxx_INPUT_CLOCK  0x1d
#define CH7xxx_GPIO     0x1e
#define CH7xxx_GPIO_HPIR    (1<<3)
#define CH7xxx_IDF      0x1f

#define CH7xxx_IDF_HSP      (1<<3)
#define CH7xxx_IDF_VSP      (1<<4)

#define CH7xxx_CONNECTION_DETECT 0x20
#define CH7xxx_CDET_DVI     (1<<5)

#define CH7301_DAC_CNTL     0x21
#define CH7301_HOTPLUG      0x23
#define CH7xxx_TCTL     0x31
#define CH7xxx_TVCO     0x32
#define CH7xxx_TPCP     0x33
#define CH7xxx_TPD      0x34
#define CH7xxx_TPVT     0x35
#define CH7xxx_TLPF     0x36
#define CH7xxx_TCT      0x37
#define CH7301_TEST_PATTERN 0x48

#define CH7xxx_PM       0x49
#define CH7xxx_PM_FPD       (1<<0)
#define CH7301_PM_DACPD0    (1<<1)
#define CH7301_PM_DACPD1    (1<<2)
#define CH7301_PM_DACPD2    (1<<3)
#define CH7xxx_PM_DVIL      (1<<6)
#define CH7xxx_PM_DVIP      (1<<7)

#define CH7301_SYNC_POLARITY    0x56
#define CH7301_SYNC_RGB_YUV (1<<0)
#define CH7301_SYNC_POL_DVI (1<<5)

static struct ch7xxx_id_struct {
    uint8_t vid;
    char *name;
} ch7xxx_ids[] = {
    { CH7011_VID, "CH7011" },
    { CH7009A_VID, "CH7009A" },
    { CH7009B_VID, "CH7009B" },
    { CH7301_VID, "CH7301" },
};

struct ch7xxx_priv {
    bool quiet;
};

static char *ch7xxx_get_id(uint8_t vid)
{
    int i;

    for (i = 0; i < ARRAY_SIZE(ch7xxx_ids); i++) {
        if (ch7xxx_ids[i].vid == vid)
            return ch7xxx_ids[i].name;
    }

    return NULL;
}

static bool ch7xxx_readb(struct intel_dvo_device *dvo, int addr, uint8_t *ch)
{
    struct ch7xxx_priv *ch7xxx = dvo->dev_priv;
    struct i2c_adapter *adapter = dvo->i2c_bus;
    u8 out_buf[2];
    u8 in_buf[2];

    struct i2c_msg msgs[] = {
        {
            .addr = dvo->slave_addr,
            .flags = 0,
            .len = 1,
            .buf = out_buf,
        },
        {
            .addr = dvo->slave_addr,
            .flags = I2C_M_RD,
            .len = 1,
            .buf = in_buf,
        }
    };

    out_buf[0] = addr;
    out_buf[1] = 0;

    if (i2c_transfer(adapter, msgs, 2) == 2) {
        *ch = in_buf[0];
        return true;
    };

    if (!ch7xxx->quiet) {
        DRM_DEBUG_KMS("Unable to read register 0x%02x from %s:%02x.\n",
              addr, adapter->name, dvo->slave_addr);
    }
    return false;
}

static bool ch7xxx_writeb(struct intel_dvo_device *dvo, int addr, uint8_t ch)
{
    struct ch7xxx_priv *ch7xxx = dvo->dev_priv;
    struct i2c_adapter *adapter = dvo->i2c_bus;
    uint8_t out_buf[2];
    struct i2c_msg msg = {
        .addr = dvo->slave_addr,
        .flags = 0,
        .len = 2,
        .buf = out_buf,
    };

    out_buf[0] = addr;
    out_buf[1] = ch;

    if (i2c_transfer(adapter, &msg, 1) == 1)
        return true;

    if (!ch7xxx->quiet) {
        DRM_DEBUG_KMS("Unable to write register 0x%02x to %s:%d.\n",
              addr, adapter->name, dvo->slave_addr);
    }

    return false;
}

static bool ch7xxx_init(struct intel_dvo_device *dvo,
            struct i2c_adapter *adapter)
{
    /* this will detect the CH7xxx chip on the specified i2c bus */
    struct ch7xxx_priv *ch7xxx;
    uint8_t vendor, device;
    char *name;

    ch7xxx = kzalloc(sizeof(struct ch7xxx_priv), GFP_KERNEL);
    if (ch7xxx == NULL)
        return false;

    dvo->i2c_bus = adapter;
    dvo->dev_priv = ch7xxx;
    ch7xxx->quiet = true;

    if (!ch7xxx_readb(dvo, CH7xxx_REG_VID, &vendor))
        goto out;

    name = ch7xxx_get_id(vendor);
    if (!name) {
        DRM_DEBUG_KMS("ch7xxx not detected; got 0x%02x from %s "
                "slave %d.\n",
              vendor, adapter->name, dvo->slave_addr);
        goto out;
    }


    if (!ch7xxx_readb(dvo, CH7xxx_REG_DID, &device))
        goto out;

    if (device != CH7xxx_DID) {
        DRM_DEBUG_KMS("ch7xxx not detected; got 0x%02x from %s "
                "slave %d.\n",
              vendor, adapter->name, dvo->slave_addr);
        goto out;
    }

    ch7xxx->quiet = false;
    DRM_DEBUG_KMS("Detected %s chipset, vendor/device ID 0x%02x/0x%02x\n",
          name, vendor, device);
    return true;
out:
    kfree(ch7xxx);
    return false;
}

static enum drm_connector_status ch7xxx_detect(struct intel_dvo_device *dvo)
{
    uint8_t cdet, orig_pm, pm;

    ch7xxx_readb(dvo, CH7xxx_PM, &orig_pm);

    pm = orig_pm;
    pm &= ~CH7xxx_PM_FPD;
    pm |= CH7xxx_PM_DVIL | CH7xxx_PM_DVIP;

    ch7xxx_writeb(dvo, CH7xxx_PM, pm);

    ch7xxx_readb(dvo, CH7xxx_CONNECTION_DETECT, &cdet);

    ch7xxx_writeb(dvo, CH7xxx_PM, orig_pm);

    if (cdet & CH7xxx_CDET_DVI)
        return connector_status_connected;
    return connector_status_disconnected;
}

static enum drm_mode_status ch7xxx_mode_valid(struct intel_dvo_device *dvo,
                          struct drm_display_mode *mode)
{
    if (mode->clock > 165000)
        return MODE_CLOCK_HIGH;

    return MODE_OK;
}

static void ch7xxx_mode_set(struct intel_dvo_device *dvo,
                struct drm_display_mode *mode,
                struct drm_display_mode *adjusted_mode)
{
    uint8_t tvco, tpcp, tpd, tlpf, idf;

    if (mode->clock <= 65000) {
        tvco = 0x23;
        tpcp = 0x08;
        tpd = 0x16;
        tlpf = 0x60;
    } else {
        tvco = 0x2d;
        tpcp = 0x06;
        tpd = 0x26;
        tlpf = 0xa0;
    }

    ch7xxx_writeb(dvo, CH7xxx_TCTL, 0x00);
    ch7xxx_writeb(dvo, CH7xxx_TVCO, tvco);
    ch7xxx_writeb(dvo, CH7xxx_TPCP, tpcp);
    ch7xxx_writeb(dvo, CH7xxx_TPD, tpd);
    ch7xxx_writeb(dvo, CH7xxx_TPVT, 0x30);
    ch7xxx_writeb(dvo, CH7xxx_TLPF, tlpf);
    ch7xxx_writeb(dvo, CH7xxx_TCT, 0x00);

    ch7xxx_readb(dvo, CH7xxx_IDF, &idf);

    idf &= ~(CH7xxx_IDF_HSP | CH7xxx_IDF_VSP);
    if (mode->flags & DRM_MODE_FLAG_PHSYNC)
        idf |= CH7xxx_IDF_HSP;

    if (mode->flags & DRM_MODE_FLAG_PVSYNC)
        idf |= CH7xxx_IDF_HSP;

    ch7xxx_writeb(dvo, CH7xxx_IDF, idf);
}

/* set the CH7xxx power state */
static void ch7xxx_dpms(struct intel_dvo_device *dvo, bool enable)
{
    if (enable)
        ch7xxx_writeb(dvo, CH7xxx_PM, CH7xxx_PM_DVIL | CH7xxx_PM_DVIP);
    else
        ch7xxx_writeb(dvo, CH7xxx_PM, CH7xxx_PM_FPD);
}

static bool ch7xxx_get_hw_state(struct intel_dvo_device *dvo)
{
    u8 val;

    ch7xxx_readb(dvo, CH7xxx_PM, &val);

    if (val & (CH7xxx_PM_DVIL | CH7xxx_PM_DVIP))
        return true;
    else
        return false;
}

static void ch7xxx_dump_regs(struct intel_dvo_device *dvo)
{
    int i;

    for (i = 0; i < CH7xxx_NUM_REGS; i++) {
        uint8_t val;
        if ((i % 8) == 0)
            DRM_LOG_KMS("\n %02X: ", i);
        ch7xxx_readb(dvo, i, &val);
        DRM_LOG_KMS("%02X ", val);
    }
}

static void ch7xxx_destroy(struct intel_dvo_device *dvo)
{
    struct ch7xxx_priv *ch7xxx = dvo->dev_priv;

    if (ch7xxx) {
        kfree(ch7xxx);
        dvo->dev_priv = NULL;
    }
}

struct intel_dvo_dev_ops ch7xxx_ops = {
    .init = ch7xxx_init,
    .detect = ch7xxx_detect,
    .mode_valid = ch7xxx_mode_valid,
    .mode_set = ch7xxx_mode_set,
    .dpms = ch7xxx_dpms,
    .get_hw_state = ch7xxx_get_hw_state,
    .dump_regs = ch7xxx_dump_regs,
    .destroy = ch7xxx_destroy,
};