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1/*2 * linux/drivers/video/riva/fbdev-i2c.c - nVidia i2c3 *4 * Maintained by Ani Joshi <ajoshi@shell.unixbox.com>5 *6 * Copyright 2004 Antonino A. Daplas <adaplas @pol.net>7 *8 * Based on radeonfb-i2c.c9 *10 * This file is subject to the terms and conditions of the GNU General Public11 * License. See the file COPYING in the main directory of this archive12 * for more details.13 */14 15#include <linux/module.h>16#include <linux/kernel.h>17#include <linux/delay.h>18#include <linux/pci.h>19#include <linux/fb.h>20#include <linux/jiffies.h>21 22#include <asm/io.h>23 24#include "rivafb.h"25#include "../edid.h"26 27static void riva_gpio_setscl(void* data, int state)28{29 struct riva_i2c_chan *chan = data;30 struct riva_par *par = chan->par;31 u32 val;32 33 VGA_WR08(par->riva.PCIO, 0x3d4, chan->ddc_base + 1);34 val = VGA_RD08(par->riva.PCIO, 0x3d5) & 0xf0;35 36 if (state)37 val |= 0x20;38 else39 val &= ~0x20;40 41 VGA_WR08(par->riva.PCIO, 0x3d4, chan->ddc_base + 1);42 VGA_WR08(par->riva.PCIO, 0x3d5, val | 0x1);43}44 45static void riva_gpio_setsda(void* data, int state)46{47 struct riva_i2c_chan *chan = data;48 struct riva_par *par = chan->par;49 u32 val;50 51 VGA_WR08(par->riva.PCIO, 0x3d4, chan->ddc_base + 1);52 val = VGA_RD08(par->riva.PCIO, 0x3d5) & 0xf0;53 54 if (state)55 val |= 0x10;56 else57 val &= ~0x10;58 59 VGA_WR08(par->riva.PCIO, 0x3d4, chan->ddc_base + 1);60 VGA_WR08(par->riva.PCIO, 0x3d5, val | 0x1);61}62 63static int riva_gpio_getscl(void* data)64{65 struct riva_i2c_chan *chan = data;66 struct riva_par *par = chan->par;67 u32 val = 0;68 69 VGA_WR08(par->riva.PCIO, 0x3d4, chan->ddc_base);70 if (VGA_RD08(par->riva.PCIO, 0x3d5) & 0x04)71 val = 1;72 73 return val;74}75 76static int riva_gpio_getsda(void* data)77{78 struct riva_i2c_chan *chan = data;79 struct riva_par *par = chan->par;80 u32 val = 0;81 82 VGA_WR08(par->riva.PCIO, 0x3d4, chan->ddc_base);83 if (VGA_RD08(par->riva.PCIO, 0x3d5) & 0x08)84 val = 1;85 86 return val;87}88 89static int riva_setup_i2c_bus(struct riva_i2c_chan *chan, const char *name,90 unsigned int i2c_class)91{92 int rc;93 94 strcpy(chan->adapter.name, name);95 chan->adapter.owner = THIS_MODULE;96 chan->adapter.class = i2c_class;97 chan->adapter.algo_data = &chan->algo;98 chan->adapter.dev.parent = &chan->par->pdev->dev;99 chan->algo.setsda = riva_gpio_setsda;100 chan->algo.setscl = riva_gpio_setscl;101 chan->algo.getsda = riva_gpio_getsda;102 chan->algo.getscl = riva_gpio_getscl;103 chan->algo.udelay = 40;104 chan->algo.timeout = msecs_to_jiffies(2);105 chan->algo.data = chan;106 107 i2c_set_adapdata(&chan->adapter, chan);108 109 /* Raise SCL and SDA */110 riva_gpio_setsda(chan, 1);111 riva_gpio_setscl(chan, 1);112 udelay(20);113 114 rc = i2c_bit_add_bus(&chan->adapter);115 if (rc == 0)116 dev_dbg(&chan->par->pdev->dev, "I2C bus %s registered.\n", name);117 else {118 dev_warn(&chan->par->pdev->dev,119 "Failed to register I2C bus %s.\n", name);120 chan->par = NULL;121 }122 123 return rc;124}125 126void riva_create_i2c_busses(struct riva_par *par)127{128 par->chan[0].par = par;129 par->chan[1].par = par;130 par->chan[2].par = par;131 132 par->chan[0].ddc_base = 0x36;133 par->chan[1].ddc_base = 0x3e;134 par->chan[2].ddc_base = 0x50;135 riva_setup_i2c_bus(&par->chan[0], "BUS1", I2C_CLASS_HWMON);136 riva_setup_i2c_bus(&par->chan[1], "BUS2", 0);137 riva_setup_i2c_bus(&par->chan[2], "BUS3", 0);138}139 140void riva_delete_i2c_busses(struct riva_par *par)141{142 int i;143 144 for (i = 0; i < 3; i++) {145 if (!par->chan[i].par)146 continue;147 i2c_del_adapter(&par->chan[i].adapter);148 par->chan[i].par = NULL;149 }150}151 152int riva_probe_i2c_connector(struct riva_par *par, int conn, u8 **out_edid)153{154 u8 *edid = NULL;155 156 if (par->chan[conn].par)157 edid = fb_ddc_read(&par->chan[conn].adapter);158 159 if (out_edid)160 *out_edid = edid;161 if (!edid)162 return 1;163 164 return 0;165}166 167