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// SPDX-License-Identifier: GPL-2.0-only
/*
*
* Hardware accelerated Matrox Millennium I, II, Mystique, G100, G200, G400 and G450.
*
* (c) 1998-2002 Petr Vandrovec <vandrove@vc.cvut.cz>
*
* 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_scanned_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 <vandrove@vc.cvut.cz>");
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");
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