168 lines
3.6 KiB
C
168 lines
3.6 KiB
C
/*
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* linux/drivers/video/riva/fbdev-i2c.c - nVidia i2c
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*
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* Maintained by Ani Joshi <ajoshi@shell.unixbox.com>
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*
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* Copyright 2004 Antonino A. Daplas <adaplas @pol.net>
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*
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* Based on radeonfb-i2c.c
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive
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* for more details.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/delay.h>
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#include <linux/pci.h>
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#include <linux/fb.h>
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#include <linux/jiffies.h>
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#include <asm/io.h>
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#include "rivafb.h"
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#include "../edid.h"
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static void riva_gpio_setscl(void* data, int state)
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{
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struct riva_i2c_chan *chan = data;
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struct riva_par *par = chan->par;
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u32 val;
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VGA_WR08(par->riva.PCIO, 0x3d4, chan->ddc_base + 1);
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val = VGA_RD08(par->riva.PCIO, 0x3d5) & 0xf0;
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if (state)
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val |= 0x20;
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else
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val &= ~0x20;
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VGA_WR08(par->riva.PCIO, 0x3d4, chan->ddc_base + 1);
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VGA_WR08(par->riva.PCIO, 0x3d5, val | 0x1);
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}
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static void riva_gpio_setsda(void* data, int state)
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{
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struct riva_i2c_chan *chan = data;
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struct riva_par *par = chan->par;
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u32 val;
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VGA_WR08(par->riva.PCIO, 0x3d4, chan->ddc_base + 1);
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val = VGA_RD08(par->riva.PCIO, 0x3d5) & 0xf0;
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if (state)
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val |= 0x10;
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else
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val &= ~0x10;
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VGA_WR08(par->riva.PCIO, 0x3d4, chan->ddc_base + 1);
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VGA_WR08(par->riva.PCIO, 0x3d5, val | 0x1);
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}
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static int riva_gpio_getscl(void* data)
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{
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struct riva_i2c_chan *chan = data;
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struct riva_par *par = chan->par;
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u32 val = 0;
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VGA_WR08(par->riva.PCIO, 0x3d4, chan->ddc_base);
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if (VGA_RD08(par->riva.PCIO, 0x3d5) & 0x04)
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val = 1;
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return val;
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}
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static int riva_gpio_getsda(void* data)
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{
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struct riva_i2c_chan *chan = data;
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struct riva_par *par = chan->par;
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u32 val = 0;
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VGA_WR08(par->riva.PCIO, 0x3d4, chan->ddc_base);
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if (VGA_RD08(par->riva.PCIO, 0x3d5) & 0x08)
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val = 1;
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return val;
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}
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static int __devinit riva_setup_i2c_bus(struct riva_i2c_chan *chan,
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const char *name,
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unsigned int i2c_class)
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{
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int rc;
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strcpy(chan->adapter.name, name);
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chan->adapter.owner = THIS_MODULE;
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chan->adapter.class = i2c_class;
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chan->adapter.algo_data = &chan->algo;
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chan->adapter.dev.parent = &chan->par->pdev->dev;
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chan->algo.setsda = riva_gpio_setsda;
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chan->algo.setscl = riva_gpio_setscl;
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chan->algo.getsda = riva_gpio_getsda;
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chan->algo.getscl = riva_gpio_getscl;
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chan->algo.udelay = 40;
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chan->algo.timeout = msecs_to_jiffies(2);
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chan->algo.data = chan;
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i2c_set_adapdata(&chan->adapter, chan);
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/* Raise SCL and SDA */
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riva_gpio_setsda(chan, 1);
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riva_gpio_setscl(chan, 1);
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udelay(20);
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rc = i2c_bit_add_bus(&chan->adapter);
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if (rc == 0)
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dev_dbg(&chan->par->pdev->dev, "I2C bus %s registered.\n", name);
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else {
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dev_warn(&chan->par->pdev->dev,
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"Failed to register I2C bus %s.\n", name);
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chan->par = NULL;
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}
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return rc;
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}
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void __devinit riva_create_i2c_busses(struct riva_par *par)
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{
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par->chan[0].par = par;
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par->chan[1].par = par;
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par->chan[2].par = par;
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par->chan[0].ddc_base = 0x36;
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par->chan[1].ddc_base = 0x3e;
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par->chan[2].ddc_base = 0x50;
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riva_setup_i2c_bus(&par->chan[0], "BUS1", I2C_CLASS_HWMON);
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riva_setup_i2c_bus(&par->chan[1], "BUS2", 0);
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riva_setup_i2c_bus(&par->chan[2], "BUS3", 0);
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}
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void riva_delete_i2c_busses(struct riva_par *par)
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{
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int i;
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for (i = 0; i < 3; i++) {
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if (!par->chan[i].par)
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continue;
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i2c_del_adapter(&par->chan[i].adapter);
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par->chan[i].par = NULL;
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}
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}
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int __devinit riva_probe_i2c_connector(struct riva_par *par, int conn, u8 **out_edid)
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{
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u8 *edid = NULL;
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if (par->chan[conn].par)
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edid = fb_ddc_read(&par->chan[conn].adapter);
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if (out_edid)
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*out_edid = edid;
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if (!edid)
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return 1;
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return 0;
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}
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