i2c-matroxfb.c

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/*
 *
 * Hardware accelerated Matrox Millennium I, II, Mystique, G100, G200, G400 and G450.
 *
 * (c) 1998-2002 Petr Vandrovec <[email protected]>
 *
 * Version: 1.64 2002/06/10
 *
 * See matroxfb_base.c for contributors.
 *
 */

#include "matroxfb_base.h"
#include "matroxfb_maven.h"
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/i2c-algo-bit.h>

/* MGA-TVO I2C for G200, G400 */
#define MAT_CLK     0x20
#define MAT_DATA    0x10
/* primary head DDC for Mystique(?), G100, G200, G400 */
#define DDC1_CLK    0x08
#define DDC1_DATA   0x02
/* primary head DDC for Millennium, Millennium II */
#define DDC1B_CLK   0x10
#define DDC1B_DATA  0x04
/* secondary head DDC for G400 */
#define DDC2_CLK    0x04
#define DDC2_DATA   0x01

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

struct matroxfb_dh_maven_info {
    struct i2c_bit_adapter  maven;
    struct i2c_bit_adapter  ddc1;
    struct i2c_bit_adapter  ddc2;
};

static int matroxfb_read_gpio(struct matrox_fb_info* minfo) {
    unsigned long flags;
    int v;

    matroxfb_DAC_lock_irqsave(flags);
    v = matroxfb_DAC_in(minfo, DAC_XGENIODATA);
    matroxfb_DAC_unlock_irqrestore(flags);
    return v;
}

static void matroxfb_set_gpio(struct matrox_fb_info* minfo, int mask, int val) {
    unsigned long flags;
    int v;

    matroxfb_DAC_lock_irqsave(flags);
    v = (matroxfb_DAC_in(minfo, DAC_XGENIOCTRL) & mask) | val;
    matroxfb_DAC_out(minfo, DAC_XGENIOCTRL, v);
    /* We must reset GENIODATA very often... XFree plays with this register */
    matroxfb_DAC_out(minfo, DAC_XGENIODATA, 0x00);
    matroxfb_DAC_unlock_irqrestore(flags);
}

/* software I2C functions */
static inline void matroxfb_i2c_set(struct matrox_fb_info* minfo, int mask, int state) {
    if (state)
        state = 0;
    else
        state = mask;
    matroxfb_set_gpio(minfo, ~mask, state);
}

static void matroxfb_gpio_setsda(void* data, int state) {
    struct i2c_bit_adapter* b = data;
    matroxfb_i2c_set(b->minfo, b->mask.data, state);
}

static void matroxfb_gpio_setscl(void* data, int state) {
    struct i2c_bit_adapter* b = data;
    matroxfb_i2c_set(b->minfo, b->mask.clock, state);
}

static int matroxfb_gpio_getsda(void* data) {
    struct i2c_bit_adapter* b = data;
    return (matroxfb_read_gpio(b->minfo) & b->mask.data) ? 1 : 0;
}

static int matroxfb_gpio_getscl(void* data) {
    struct i2c_bit_adapter* b = data;
    return (matroxfb_read_gpio(b->minfo) & b->mask.clock) ? 1 : 0;
}

static const struct i2c_algo_bit_data matrox_i2c_algo_template =
{
    .setsda     = matroxfb_gpio_setsda,
    .setscl     = matroxfb_gpio_setscl,
    .getsda     = matroxfb_gpio_getsda,
    .getscl     = matroxfb_gpio_getscl,
    .udelay     = 10,
    .timeout    = 100,
};

static int i2c_bus_reg(struct i2c_bit_adapter* b, struct matrox_fb_info* minfo, 
        unsigned int data, unsigned int clock, const char *name,
        int class)
{
    int err;

    b->minfo = minfo;
    b->mask.data = data;
    b->mask.clock = clock;
    b->adapter.owner = THIS_MODULE;
    snprintf(b->adapter.name, sizeof(b->adapter.name), name,
        minfo->fbcon.node);
    i2c_set_adapdata(&b->adapter, b);
    b->adapter.class = class;
    b->adapter.algo_data = &b->bac;
    b->adapter.dev.parent = &minfo->pcidev->dev;
    b->bac = matrox_i2c_algo_template;
    b->bac.data = b;
    err = i2c_bit_add_bus(&b->adapter);
    b->initialized = !err;
    return err;
}

static void i2c_bit_bus_del(struct i2c_bit_adapter* b) {
    if (b->initialized) {
        i2c_del_adapter(&b->adapter);
        b->initialized = 0;
    }
}

static inline void i2c_maven_done(struct matroxfb_dh_maven_info* minfo2) {
    i2c_bit_bus_del(&minfo2->maven);
}

static inline void i2c_ddc1_done(struct matroxfb_dh_maven_info* minfo2) {
    i2c_bit_bus_del(&minfo2->ddc1);
}

static inline void i2c_ddc2_done(struct matroxfb_dh_maven_info* minfo2) {
    i2c_bit_bus_del(&minfo2->ddc2);
}

static void* i2c_matroxfb_probe(struct matrox_fb_info* minfo) {
    int err;
    unsigned long flags;
    struct matroxfb_dh_maven_info* m2info;

    m2info = kzalloc(sizeof(*m2info), GFP_KERNEL);
    if (!m2info)
        return NULL;

    matroxfb_DAC_lock_irqsave(flags);
    matroxfb_DAC_out(minfo, DAC_XGENIODATA, 0xFF);
    matroxfb_DAC_out(minfo, DAC_XGENIOCTRL, 0x00);
    matroxfb_DAC_unlock_irqrestore(flags);

    switch (minfo->chip) {
        case MGA_2064:
        case MGA_2164:
            err = i2c_bus_reg(&m2info->ddc1, minfo,
                      DDC1B_DATA, DDC1B_CLK,
                      "DDC:fb%u #0", I2C_CLASS_DDC);
            break;
        default:
            err = i2c_bus_reg(&m2info->ddc1, minfo,
                      DDC1_DATA, DDC1_CLK,
                      "DDC:fb%u #0", I2C_CLASS_DDC);
            break;
    }
    if (err)
        goto fail_ddc1;
    if (minfo->devflags.dualhead) {
        err = i2c_bus_reg(&m2info->ddc2, minfo,
                  DDC2_DATA, DDC2_CLK,
                  "DDC:fb%u #1", I2C_CLASS_DDC);
        if (err == -ENODEV) {
            printk(KERN_INFO "i2c-matroxfb: VGA->TV plug detected, DDC unavailable.\n");
        } else if (err)
            printk(KERN_INFO "i2c-matroxfb: Could not register secondary output i2c bus. Continuing anyway.\n");
        /* Register maven bus even on G450/G550 */
        err = i2c_bus_reg(&m2info->maven, minfo,
                  MAT_DATA, MAT_CLK, "MAVEN:fb%u", 0);
        if (err)
            printk(KERN_INFO "i2c-matroxfb: Could not register Maven i2c bus. Continuing anyway.\n");
        else {
            struct i2c_board_info maven_info = {
                I2C_BOARD_INFO("maven", 0x1b),
            };
            unsigned short const addr_list[2] = {
                0x1b, I2C_CLIENT_END
            };

            i2c_new_probed_device(&m2info->maven.adapter,
                          &maven_info, addr_list, NULL);
        }
    }
    return m2info;
fail_ddc1:;
    kfree(m2info);
    printk(KERN_ERR "i2c-matroxfb: Could not register primary adapter DDC bus.\n");
    return NULL;
}

static void i2c_matroxfb_remove(struct matrox_fb_info* minfo, void* data) {
    struct matroxfb_dh_maven_info* m2info = data;

    i2c_maven_done(m2info);
    i2c_ddc2_done(m2info);
    i2c_ddc1_done(m2info);
    kfree(m2info);
}

static struct matroxfb_driver i2c_matroxfb = {
    .node =     LIST_HEAD_INIT(i2c_matroxfb.node),
    .name =     "i2c-matroxfb",
    .probe =    i2c_matroxfb_probe,
    .remove =   i2c_matroxfb_remove,
};

static int __init i2c_matroxfb_init(void) {
    if (matroxfb_register_driver(&i2c_matroxfb)) {
        printk(KERN_ERR "i2c-matroxfb: failed to register driver\n");
        return -ENXIO;
    }
    return 0;
}

static void __exit i2c_matroxfb_exit(void) {
    matroxfb_unregister_driver(&i2c_matroxfb);
}

MODULE_AUTHOR("(c) 1999-2002 Petr Vandrovec <[email protected]>");
MODULE_DESCRIPTION("Support module providing I2C buses present on Matrox videocards");

module_init(i2c_matroxfb_init);
module_exit(i2c_matroxfb_exit);
/* no __setup required */
MODULE_LICENSE("GPL");