240 lines
6.3 KiB
C
240 lines
6.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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*
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* Hardware accelerated Matrox Millennium I, II, Mystique, G100, G200, G400 and G450.
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*
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* (c) 1998-2002 Petr Vandrovec <vandrove@vc.cvut.cz>
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*
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* Version: 1.64 2002/06/10
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*
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* See matroxfb_base.c for contributors.
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*
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*/
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#include "matroxfb_base.h"
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#include "matroxfb_maven.h"
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#include <linux/i2c.h>
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#include <linux/slab.h>
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#include <linux/i2c-algo-bit.h>
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/* MGA-TVO I2C for G200, G400 */
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#define MAT_CLK 0x20
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#define MAT_DATA 0x10
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/* primary head DDC for Mystique(?), G100, G200, G400 */
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#define DDC1_CLK 0x08
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#define DDC1_DATA 0x02
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/* primary head DDC for Millennium, Millennium II */
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#define DDC1B_CLK 0x10
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#define DDC1B_DATA 0x04
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/* secondary head DDC for G400 */
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#define DDC2_CLK 0x04
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#define DDC2_DATA 0x01
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/******************************************************/
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struct matroxfb_dh_maven_info {
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struct i2c_bit_adapter maven;
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struct i2c_bit_adapter ddc1;
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struct i2c_bit_adapter ddc2;
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};
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static int matroxfb_read_gpio(struct matrox_fb_info* minfo) {
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unsigned long flags;
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int v;
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matroxfb_DAC_lock_irqsave(flags);
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v = matroxfb_DAC_in(minfo, DAC_XGENIODATA);
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matroxfb_DAC_unlock_irqrestore(flags);
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return v;
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}
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static void matroxfb_set_gpio(struct matrox_fb_info* minfo, int mask, int val) {
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unsigned long flags;
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int v;
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matroxfb_DAC_lock_irqsave(flags);
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v = (matroxfb_DAC_in(minfo, DAC_XGENIOCTRL) & mask) | val;
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matroxfb_DAC_out(minfo, DAC_XGENIOCTRL, v);
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/* We must reset GENIODATA very often... XFree plays with this register */
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matroxfb_DAC_out(minfo, DAC_XGENIODATA, 0x00);
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matroxfb_DAC_unlock_irqrestore(flags);
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}
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/* software I2C functions */
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static inline void matroxfb_i2c_set(struct matrox_fb_info* minfo, int mask, int state) {
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if (state)
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state = 0;
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else
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state = mask;
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matroxfb_set_gpio(minfo, ~mask, state);
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}
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static void matroxfb_gpio_setsda(void* data, int state) {
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struct i2c_bit_adapter* b = data;
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matroxfb_i2c_set(b->minfo, b->mask.data, state);
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}
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static void matroxfb_gpio_setscl(void* data, int state) {
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struct i2c_bit_adapter* b = data;
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matroxfb_i2c_set(b->minfo, b->mask.clock, state);
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}
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static int matroxfb_gpio_getsda(void* data) {
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struct i2c_bit_adapter* b = data;
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return (matroxfb_read_gpio(b->minfo) & b->mask.data) ? 1 : 0;
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}
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static int matroxfb_gpio_getscl(void* data) {
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struct i2c_bit_adapter* b = data;
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return (matroxfb_read_gpio(b->minfo) & b->mask.clock) ? 1 : 0;
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}
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static const struct i2c_algo_bit_data matrox_i2c_algo_template =
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{
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.setsda = matroxfb_gpio_setsda,
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.setscl = matroxfb_gpio_setscl,
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.getsda = matroxfb_gpio_getsda,
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.getscl = matroxfb_gpio_getscl,
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.udelay = 10,
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.timeout = 100,
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};
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static int i2c_bus_reg(struct i2c_bit_adapter* b, struct matrox_fb_info* minfo,
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unsigned int data, unsigned int clock, const char *name,
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int class)
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{
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int err;
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b->minfo = minfo;
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b->mask.data = data;
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b->mask.clock = clock;
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b->adapter.owner = THIS_MODULE;
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snprintf(b->adapter.name, sizeof(b->adapter.name), name,
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minfo->fbcon.node);
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i2c_set_adapdata(&b->adapter, b);
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b->adapter.class = class;
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b->adapter.algo_data = &b->bac;
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b->adapter.dev.parent = &minfo->pcidev->dev;
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b->bac = matrox_i2c_algo_template;
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b->bac.data = b;
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err = i2c_bit_add_bus(&b->adapter);
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b->initialized = !err;
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return err;
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}
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static void i2c_bit_bus_del(struct i2c_bit_adapter* b) {
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if (b->initialized) {
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i2c_del_adapter(&b->adapter);
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b->initialized = 0;
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}
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}
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static inline void i2c_maven_done(struct matroxfb_dh_maven_info* minfo2) {
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i2c_bit_bus_del(&minfo2->maven);
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}
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static inline void i2c_ddc1_done(struct matroxfb_dh_maven_info* minfo2) {
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i2c_bit_bus_del(&minfo2->ddc1);
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}
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static inline void i2c_ddc2_done(struct matroxfb_dh_maven_info* minfo2) {
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i2c_bit_bus_del(&minfo2->ddc2);
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}
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static void* i2c_matroxfb_probe(struct matrox_fb_info* minfo) {
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int err;
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unsigned long flags;
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struct matroxfb_dh_maven_info* m2info;
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m2info = kzalloc(sizeof(*m2info), GFP_KERNEL);
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if (!m2info)
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return NULL;
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matroxfb_DAC_lock_irqsave(flags);
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matroxfb_DAC_out(minfo, DAC_XGENIODATA, 0xFF);
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matroxfb_DAC_out(minfo, DAC_XGENIOCTRL, 0x00);
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matroxfb_DAC_unlock_irqrestore(flags);
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switch (minfo->chip) {
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case MGA_2064:
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case MGA_2164:
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err = i2c_bus_reg(&m2info->ddc1, minfo,
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DDC1B_DATA, DDC1B_CLK,
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"DDC:fb%u #0", I2C_CLASS_DDC);
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break;
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default:
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err = i2c_bus_reg(&m2info->ddc1, minfo,
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DDC1_DATA, DDC1_CLK,
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"DDC:fb%u #0", I2C_CLASS_DDC);
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break;
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}
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if (err)
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goto fail_ddc1;
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if (minfo->devflags.dualhead) {
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err = i2c_bus_reg(&m2info->ddc2, minfo,
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DDC2_DATA, DDC2_CLK,
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"DDC:fb%u #1", I2C_CLASS_DDC);
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if (err == -ENODEV) {
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printk(KERN_INFO "i2c-matroxfb: VGA->TV plug detected, DDC unavailable.\n");
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} else if (err)
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printk(KERN_INFO "i2c-matroxfb: Could not register secondary output i2c bus. Continuing anyway.\n");
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/* Register maven bus even on G450/G550 */
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err = i2c_bus_reg(&m2info->maven, minfo,
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MAT_DATA, MAT_CLK, "MAVEN:fb%u", 0);
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if (err)
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printk(KERN_INFO "i2c-matroxfb: Could not register Maven i2c bus. Continuing anyway.\n");
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else {
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struct i2c_board_info maven_info = {
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I2C_BOARD_INFO("maven", 0x1b),
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};
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unsigned short const addr_list[2] = {
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0x1b, I2C_CLIENT_END
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};
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i2c_new_scanned_device(&m2info->maven.adapter,
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&maven_info, addr_list, NULL);
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}
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}
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return m2info;
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fail_ddc1:;
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kfree(m2info);
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printk(KERN_ERR "i2c-matroxfb: Could not register primary adapter DDC bus.\n");
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return NULL;
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}
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static void i2c_matroxfb_remove(struct matrox_fb_info* minfo, void* data) {
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struct matroxfb_dh_maven_info* m2info = data;
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i2c_maven_done(m2info);
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i2c_ddc2_done(m2info);
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i2c_ddc1_done(m2info);
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kfree(m2info);
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}
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static struct matroxfb_driver i2c_matroxfb = {
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.node = LIST_HEAD_INIT(i2c_matroxfb.node),
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.name = "i2c-matroxfb",
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.probe = i2c_matroxfb_probe,
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.remove = i2c_matroxfb_remove,
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};
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static int __init i2c_matroxfb_init(void) {
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if (matroxfb_register_driver(&i2c_matroxfb)) {
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printk(KERN_ERR "i2c-matroxfb: failed to register driver\n");
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return -ENXIO;
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}
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return 0;
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}
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static void __exit i2c_matroxfb_exit(void) {
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matroxfb_unregister_driver(&i2c_matroxfb);
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}
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MODULE_AUTHOR("(c) 1999-2002 Petr Vandrovec <vandrove@vc.cvut.cz>");
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MODULE_DESCRIPTION("Support module providing I2C buses present on Matrox videocards");
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module_init(i2c_matroxfb_init);
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module_exit(i2c_matroxfb_exit);
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/* no __setup required */
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MODULE_LICENSE("GPL");
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